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ENGINEERING (1213 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Hybrid Journal   (Followers: 7)
AASRI Procedia     Open Access   (Followers: 15)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 254)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 6)
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 9)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 18)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 6)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 27)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 16)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 11)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 22)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 27)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 10)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 30)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 40)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 2)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 6)
AIChE Journal     Hybrid Journal   (Followers: 32)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access   (Followers: 1)
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 17)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 8)
Annals of Science     Hybrid Journal   (Followers: 7)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 18)
Applied Clay Science     Hybrid Journal   (Followers: 5)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Network Science     Open Access   (Followers: 1)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 3)
Applied Sciences     Open Access   (Followers: 2)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 5)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 8)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
Asia-Pacific Journal of Science and Technology     Open Access  
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 8)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 9)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 5)
Batteries     Open Access   (Followers: 6)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 24)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 4)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 10)
Biomedical Engineering     Hybrid Journal   (Followers: 15)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 14)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 18)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 34)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 9)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 14)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 30)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 44)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
Case Studies in Thermal Engineering     Open Access   (Followers: 4)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 8)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 7)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal   (Followers: 1)
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 14)
City, Culture and Society     Hybrid Journal   (Followers: 24)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 5)
Coatings     Open Access   (Followers: 4)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 2)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 14)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 27)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 271)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 199)
Composites Part B : Engineering     Hybrid Journal   (Followers: 256)
Composites Science and Technology     Hybrid Journal   (Followers: 194)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 15)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 8)
Computer Science and Engineering     Open Access   (Followers: 19)
Computers & Geosciences     Hybrid Journal   (Followers: 30)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 7)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 5)
Computers and Geotechnics     Hybrid Journal   (Followers: 11)
Computing and Visualization in Science     Hybrid Journal   (Followers: 6)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 33)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 8)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 9)
Control Engineering Practice     Hybrid Journal   (Followers: 43)
Control Theory and Informatics     Open Access   (Followers: 8)
Corrosion Science     Hybrid Journal   (Followers: 25)
Corrosion Series     Full-text available via subscription   (Followers: 6)
CT&F Ciencia, Tecnologia y Futuro     Open Access   (Followers: 1)

        1 2 3 4 5 6 7 | Last

Journal Cover CIRP Journal of Manufacturing Science and Technology
  [SJR: 1.208]   [H-I: 23]   [14 followers]  Follow
   Full-text available via subscription Subscription journal
   ISSN (Print) 1755-5817
   Published by Elsevier Homepage  [3123 journals]
  • Corporate knowledge management in Ramp-up conditions: The stakeholder
           interests account, the responsibility centers allocation
    • Authors: Julia Y. Yeleneva; Alexander A. Kharin; Konstantin S. Yelenev; Vladimir N. Andreev; Olga S. Kharina; Elena V. Kruchkova
      Abstract: Publication date: Available online 3 February 2018
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Julia Y. Yeleneva, Alexander A. Kharin, Konstantin S. Yelenev, Vladimir N. Andreev, Olga S. Kharina, Elena V. Kruchkova
      In this paper, based on stakeholder theory and value chain concept integration, a new approach to the corporate knowledge management in a Ramp-up is introduced. With set theory use, the types of knowledge the development of which is in the interest of the stakeholders are conceptually defined. The paper also includes the description of the approach to definition of responsibility centers for knowledge management, highlights their functionality, provides examples of specific practices and knowledge management tools.

      PubDate: 2018-02-05T16:42:55Z
      DOI: 10.1016/j.cirpj.2017.12.002
  • Knowledge-based PPR modelling for assembly automation
    • Authors: Mussawar Ahmad; Borja Ramis Ferrer; Bilal Ahmad; Daniel Vera; Jose L. Martinez Lastra; Robert Harrison
      Abstract: Publication date: Available online 19 January 2018
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Mussawar Ahmad, Borja Ramis Ferrer, Bilal Ahmad, Daniel Vera, Jose L. Martinez Lastra, Robert Harrison
      The paradigm shift from mass production to mass customisation and reduced product lifecycles requires continuous re-engineering/configuration of modern manufacturing systems. Although efforts are being made to design and build manufacturing systems based on the paradigms of changeability, reconfigurability, and flexibility, the knowledge of the system's capability remains unstructured and isolated from product design and engineering tools. As a result, introducing product design changes are costly, time-consuming and error-prone. To address this problem, this research utilises a Product, Process, and Resource (PPR) ontology with a view to supporting changes through information integration and knowledge generation. The approach moves away from product-centric tools such as Product Lifecycle Management (PLM) and thus a heterarchical model of the system is created. The contribution of this work is to demonstrate how modular ontologies can be utilised in a practical and industrially relevant manner by integrating the data structure of a set of component-based virtual engineering tools into the Resource domain. The research presents a proof-of-concept of the proposed approach using an automated engine assembly station as a case study. Inferences are made from explicit knowledge through rules and mapping as to whether both Product and Process requirements are met by Resource domain capabilities. The approach used in this work has the potential to significantly improve the workflow as and when new products are introduced or modifications need to be made as the scope of change can be assessed rapidly resulting in more focused engineering and design work.

      PubDate: 2018-02-05T16:42:55Z
      DOI: 10.1016/j.cirpj.2018.01.001
  • Optimization of injection molding process based on fuzzy quality
           evaluation and Taguchi experimental design
    • Authors: Mehdi Moayyedian; Kazem Abhary; Romeo Marian
      Abstract: Publication date: Available online 17 January 2018
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Mehdi Moayyedian, Kazem Abhary, Romeo Marian
      This paper presents the multi-objective optimization in injection molding. The aim of this study is to determine the best alternative for the best moldability index and better alternatives which are close to the best alternative for an injected part in injection molding technology. Consideration of Taguchi and fuzzy analytic hierarchy process (FAHP) with technique for the order performance by its similarity to the ideal solution (TOPSIS) offers an efficient use approach to evaluate different objectives. Three common defects which reduce the final quality of the injected parts are short shot possibility, shrinkage rate and warpage. The selected material for injection is polypropylene. L18 orthogonal array of Taguchi is selected and for gaining accurate results, Finite Element Analysis (FEA) is applied. To validate the simulation result, the experiment is carried out for two circular flat plates with thickness of 1mm. Finally, the highest moldability index is related to trial 2 for both simulation and experimental results. This study outcome shows instead of having one trial number which has the highest moldability index, there are 10 trial numbers with high moldability index between 0.6–1 for simulation results and 5 trial numbers with high moldability index between 0.6–1 for experimental results. It is clear, by using Taguchi with TOPSIS and FAHP if the best alternative is not possible to maintain, there are other alternatives which are very close to the best alternative with high moldability index. The main advantage of the proposed method is to increase the number of alternatives which in turn increases the moldability of the final product in injection molding.

      PubDate: 2018-02-05T16:42:55Z
      DOI: 10.1016/j.cirpj.2017.12.001
  • Fundamental mechanisms in orthogonal cutting of medical grade cobalt
           chromium alloy (ASTM F75)
    • Authors: Eamonn Ahearne; Szymon Baron
      Pages: 1 - 6
      Abstract: Publication date: November 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 19
      Author(s): Eamonn Ahearne, Szymon Baron
      Cobalt chromium alloys are sui generis materials for orthopaedic implants due mainly to unique properties of biocompatibility and wear resistance in the demanding in-vivo environment. Notwithstanding the importance of both defined and undefined edge cutting processes on form, finish and surface integrity of orthopaedic components, there has been minimal research reported in the public domain on the fundamental mechanisms in cutting of these alloys. Accordingly, this paper reports on initial research into cutting of the biomedical grade cobalt chrome molybdenum (Co-Cr-Mo) alloy, ASTM F75. Following a brief overview of physical and mechanical properties of this class of Co-Cr-Mo alloys, the results of a full factorial, orthogonal cutting experiment are presented. This involved measurement of force components (F t and F f ) as a function of the undeformed chip thickness (h) and cutting speed ( v c ) which were varied over ranges from 20 to 140μm and 20 to 60m/min respectively. The results demonstrated an expected linear increase in force components with h at speeds of 20 and 60m/min. However, at the intermediate speed of 40m/min, there was a transition between about 60 and 80μm indicating a discontinuous rather than continuous effect of speed. The results also enabled determination of the cutting force coefficients K tc , K te , K fc and K fe , as well as k i1,0.1 and m i0.1 of the Kienzle equations. These relations will enable macro-mechanic modelling of more complex cutting operations, such as milling, in the future.

      PubDate: 2017-11-16T22:15:34Z
      DOI: 10.1016/j.cirpj.2017.02.001
      Issue No: Vol. 19 (2017)
  • Unlocking water efficiency improvements in manufacturing — From
           approach to tool support
    • Authors: D. Kurle; C. Herrmann; S. Thiede
      Pages: 7 - 18
      Abstract: Publication date: November 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 19
      Author(s): D. Kurle, C. Herrmann, S. Thiede
      Water represents an irreplaceable resource for manufacturing companies and yet many fail to exploit hidden potentials in optimizing their water system and its operations. This issue is often indicated by ad-hoc water efficiency efforts leading to only sub-optimal results. A prevailing lack of transparency and unattractive amortization times further complicate a continuous improvement process. This paper presents a structured approach with prototypical tools for systematically unlocking water efficiency improvements in manufacturing companies exemplified by a consistent case from the automotive industry. Seven consecutive work steps demonstrate the identification and visualization of water related hot-spots, the derivation of basic water improvement principles, the consideration of water reuse options as well as the assessment of resource interdependencies before closing with a holistic evaluation.

      PubDate: 2017-11-16T22:15:34Z
      DOI: 10.1016/j.cirpj.2017.02.004
      Issue No: Vol. 19 (2017)
  • Study on the clamping force measurement and partial load regulation
           technology of injection molding machine
    • Authors: Binqi Rao; Hongwei Zhou; Huabin Ouyang; Yanjian Wan; Yuanhui Zhang; Jingyang Wu
      Pages: 19 - 24
      Abstract: Publication date: November 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 19
      Author(s): Binqi Rao, Hongwei Zhou, Huabin Ouyang, Yanjian Wan, Yuanhui Zhang, Jingyang Wu
      Tie bars are the most important parts of injection molding machine, and the partial load of tie bars will directly affect the product quality. According to the measurement of strain and stress of the tie bars, the partial load rate of tie bars was calculated, and the influence of different types of thread shape and template (mold) parallelism on the partial load rate of tie bars were analyzed. Experiments reveal that the partial load rate is changed within 0.8%–3.8%, and the partial load rate gradually decreases with the increase of the clamping forces. Besides, different types of the thread of tie bars have little influence on the partial load rate, while the parallel degree of the template (mold) has great influence on the partial load rate of the tie bars. Further experiments show that the partial load rate is located in 0.79%–1.81% when the parallelism of template (mold) is good, and the partial load rate of tie bars between 8.59%–11.46% when the parallelism of template (mold) is poor. Finally, the partial load adjustment system of tie bars were also designed to make the force of tie bars more uniform and the partial load rate can be reduced by detecting the partial load rate of the tie bar and using the closed-loop control.

      PubDate: 2017-11-16T22:15:34Z
      DOI: 10.1016/j.cirpj.2017.03.001
      Issue No: Vol. 19 (2017)
  • High-performance coatings for cutting tools
    • Authors: Kirsten Bobzin
      Pages: 1 - 9
      Abstract: Publication date: August 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 18
      Author(s): Kirsten Bobzin
      Cutting tools with hard coatings have been successfully employed in the industry for almost 50 years. Nowadays, 85% of all cemented carbide tools are coated. There is an increasing demand for ever more efficient tools driven by the use of new workpiece materials as well as the demand for increased productivity of manufacturing processes. A historical review of the development of CVD and PVD processes shows a continuous improvement of successful coating materials through adjustments of the chemical composition and the coating architecture. Especially nanostructured PVD coatings managed to establish themselves on the market surprisingly quickly. Cutting tools are an excellent example for how the development of coated products is traced methodologically by means of a holistic view over the application. The demand for innovative tooling concepts will continue to exist in the future, as will the high potential for this aim to be achieved through high-performance coatings on improved cutting materials with adjusted tool design.

      PubDate: 2017-08-03T09:58:32Z
      DOI: 10.1016/j.cirpj.2016.11.004
      Issue No: Vol. 18 (2017)
  • Methodology for aluminium part machining quality improvement considering
           mechanical properties and process conditions
    • Authors: X. Cerutti; K. Mocellin; S. Hassini; B. Blaysat; E. Duc
      Pages: 18 - 38
      Abstract: Publication date: August 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 18
      Author(s): X. Cerutti, K. Mocellin, S. Hassini, B. Blaysat, E. Duc
      The manufacturing of structural aluminium alloy parts requires several steps of both forming processes and heat treatments. Before machining, which is usually the last step of the manufacturing, the workpiece has thus undergone multiple manufacturing steps involving unequal plastic deformations which are source of residual stresses. During machining, where up to 90% of the initial workpiece volume can be removed, the mechanical equilibrium of the part evolves constantly with the redistribution of the initial residual stresses. For thick, large and complex parts in highly alloyed aluminium, this redistribution of the residual stresses can leads to an unexpected behaviour of the workpiece and is the main reason for both workpiece deflections (during machining) and post-machining distortions (after unclamping). These two phenomena can lead to the nonconformity of the part with the geometrical and dimensional tolerance specifications and therefore to the rejection of the part or to additional conforming steps. As a consequence, the mechanical behaviour of the workpiece has to be considered during the definition of the machining process plan to improve the machining accuracy and the robustness of the process and thus to ensure the conformity of the machined part with the dimensional and geometrical specifications, i.e. to ensure the desired machining quality. In this paper, the numerical tool developed in [1] is used to conduct an analysis on the influence of the initial workpiece residual stress state, of the fixture layout as well as of the machining sequence on the machining quality. This analysis is performed on a part which has been specially designed and which can be considered as being representative of real aerospace parts. Several comparisons with experimental results are performed, one of them using digital image correlation (DIC) measurements. Results obtained show a good agreement, validating both the prediction of the behaviour of the workpiece during machining and the prediction of the machined part geometry. Based on the results of this analysis, a classification of the parameters has been performed depending on their influence on the machining quality. A first methodology allowing to define machining process plans adapted to the initial workpiece stress state has then been created based on the previous classification. This methodology is composed of a procedure and basic guidelines which are both presented in detail. An example of an application of this methodology is then introduced, demonstrating the benefits of the approach developed in this work.

      PubDate: 2017-08-03T09:58:32Z
      DOI: 10.1016/j.cirpj.2016.07.004
      Issue No: Vol. 18 (2017)
  • Reduction of noise during milling operations
    • Authors: J. Rech; F. Dumont; A. Le Bot; P.J. Arrazola
      Pages: 39 - 44
      Abstract: Publication date: August 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 18
      Author(s): J. Rech, F. Dumont, A. Le Bot, P.J. Arrazola
      With the increase in performance of machining operations, noise levels have become an occupational health and safety problems. Identification of the main sources of noise emission when milling an aluminium component was analyzed. A machining centre, equipped with microphones, was installed in an anechoic chamber. Testing demonstrated that the part's stiffness is the most critical parameter. Cutting speed, feed and axial depth of cut tend to increase sound pressure level by increasing the impact energy, whereas radial depth of cut is not a sensitive parameter. Moreover the diameter of mills, as well as their unbalance, should be limited.

      PubDate: 2017-08-03T09:58:32Z
      DOI: 10.1016/j.cirpj.2016.09.001
      Issue No: Vol. 18 (2017)
  • 2-DOF dynamic model of vibro-compactor used for the carbon anodes block
    • Authors: Fatma Rebaïne; Mohamed Bouazara; Daniel Marceau; Duygu Kocaefe; Patrick Coulombe
      Pages: 45 - 52
      Abstract: Publication date: August 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 18
      Author(s): Fatma Rebaïne, Mohamed Bouazara, Daniel Marceau, Duygu Kocaefe, Patrick Coulombe
      The vibro-compaction is the most common technology employed for the formation of green carbon anodes in the primary aluminum industry. The acceleration is an important parameter used to predict the performance of the equipment. In this paper, a dynamic model of the vibro-compactor with two degrees of freedom is developed. The dynamic model simulates the acceleration of vibration table, the guide rod and the changes in various vibro-compaction parameters. Subsequently, an experimental method was established for measuring the dynamic rigidity of anode paste. The developed model gives a good approximation of acceleration compared with those obtained by experimental tests.
      Graphical abstract image

      PubDate: 2017-08-03T09:58:32Z
      DOI: 10.1016/j.cirpj.2016.09.003
      Issue No: Vol. 18 (2017)
  • Comparison of lubrication conditions for grinding of mild steel with
           electroplated cBN wheel
    • Authors: Michal Kuffa; Fredy Kuster; Konrad Wegener
      Pages: 53 - 59
      Abstract: Publication date: August 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 18
      Author(s): Michal Kuffa, Fredy Kuster, Konrad Wegener
      Grinding low carbon steel with diamond is regarded to be not feasible due to its chemical affinity to iron. A workpiece with comparable low hardness 330 HV30 and low-carbon content is selected. Therefore, cBN is a suitable choice of a superabrasive and thus employed. Its advantages compared to conventional abrasives are higher material removal rate and less wear. The thermal behaviour of the cBN grinding wheel in different environmental conditions is examined. The dry grinding process with a cBN grinding wheel is discussed and compared to wet grinding, grinding with minimum quantity lubrication and CO2 cooling. Increase in material removal rate and low wear rates are targeted. An electroplated, monolayer cBN grinding wheel with open structure design guarantees higher cooling ability and enlarged space for chips. The wear behaviour of the grinding wheel and the thermal damage on the workpiece surface are investigated. Cutting forces and temperatures are measured during the process for different high feed rates and depth of cuts. The thermal damages are evaluated by microscopic texture analysis. Grinding wheel dust contamination and loading connected with a significant temperature increase could be observed under dry environment. Cleaning impact of cooling nozzle on grinding wheel surface led to decreased normal forces and better surface roughness. Cooling impact of minimum quantity lubrication and CO2 cooling appeared less significant than emulsion.

      PubDate: 2017-08-03T09:58:32Z
      DOI: 10.1016/j.cirpj.2016.09.002
      Issue No: Vol. 18 (2017)
  • Forming of carbon fiber reinforced thermoplastic composite tubes –
           Experimental and numerical approaches
    • Authors: Bernhard Maron; Christian Garthaus; Andreas Hornig; Florian Lenz; Michael Hübner; Maik Gude
      Pages: 60 - 64
      Abstract: Publication date: August 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 18
      Author(s): Bernhard Maron, Christian Garthaus, Andreas Hornig, Florian Lenz, Michael Hübner, Maik Gude
      Continuous-reinforced thermoplastic composites are of growing importance for series production of lightweight components in manifold industrial areas. Novel manufacturing technologies allow the production of hollow semi-finished products that are post formed to enhance functionality. To maximize efficiency in the development process of such components it is necessary to evaluate the forming processes numerically using Finite Elements (FE)-methods. The aim is to perform feasibility studies at an early stage, reduce development time by virtual process optimization and to generate a detailed understanding of the post formed fiber architecture for further structural-mechanical analysis.

      PubDate: 2017-08-03T09:58:32Z
      DOI: 10.1016/j.cirpj.2016.09.004
      Issue No: Vol. 18 (2017)
  • Process monitoring of wire drawing using vibration sensoring
    • Authors: Lars Pejryd; Joakim Larsson; Mikael Olsson
      Pages: 65 - 74
      Abstract: Publication date: August 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 18
      Author(s): Lars Pejryd, Joakim Larsson, Mikael Olsson
      Automating the detection of processing conditions that may lead to defects in the wire during the wire drawing process is of high interest to the industry. Current practise is based primarily on operator experience. Increasing demands on product quality and process robustness emphasises the need for development of robust in-process detection methods. This work is focusing on investigating the potential of using vibration monitoring to detect process deficiencies or variations that may lead to defects in the product. Wire drawing of a carbon steel in different lubricating situations was used to investigate vibration signal response together with force measurements and surface investigation of the wire product. The results show that vibration measurement is capable of detecting loss of lubrication that leads to poor surface quality of the wire.

      PubDate: 2017-08-03T09:58:32Z
      DOI: 10.1016/j.cirpj.2016.09.006
      Issue No: Vol. 18 (2017)
  • Influence of fibre orientation, tool geometry and process parameters on
           surface quality in milling of CFRP
    • Authors: Robert Voss; Lukas Seeholzer; Friedrich Kuster; Konrad Wegener
      Pages: 75 - 91
      Abstract: Publication date: August 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 18
      Author(s): Robert Voss, Lukas Seeholzer, Friedrich Kuster, Konrad Wegener
      Machining of highly abrasive carbon fibre reinforced polymer (CFRP) in the aerospace industry requires processes with excellent machining quality, sufficient tool lifetime and short cycle times. To reach these goals a detailed understanding of the physics of cutting and chip formation based on the tool geometry is necessary. This paper presents a fundamental study in milling of unidirectional CFRP focussing on variable process parameters, tool geometries and fibre orientations. A single-edged tool with cemented carbide inserts of variable macro geometry is utilised. The experiments are evaluated by 3D microscopy of the milled edges, detailed tool wear analyses and interpretation of cutting forces. The key conclusions from the experimental results are drawn to reach a better machining quality and increased tool lifetime. The delamination of top layer fibres from the ply below up to a certain distance from the milled edge, which depends on the forces at fibre cutting angle ϕ =90°, has been identified as main quality issue. Force and tool wear models based on the measurement data are presented.

      PubDate: 2017-08-03T09:58:32Z
      DOI: 10.1016/j.cirpj.2016.10.002
      Issue No: Vol. 18 (2017)
  • 3D finite element modelling of surface modification in dry and cryogenic
           machining of EBM Ti6Al4V alloy
    • Authors: D. Umbrello; A. Bordin; S. Imbrogno; S. Bruschi
      Pages: 92 - 100
      Abstract: Publication date: August 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 18
      Author(s): D. Umbrello, A. Bordin, S. Imbrogno, S. Bruschi
      The development of reliable numerical tools for predicting the machined surface integrity has become of primary importance nowadays. This paper introduces a novel customized FE model to predict microstructural changes generated during turning of the Electron Beam Melted (EBM) Ti6Al4V alloy under dry cutting and cryogenic cooling. The material peculiar fine acicular microstructure and the nano-hardness variation are modelled and implemented into a FE model by means of a User Subroutine. The developed FE model permits to predict the microstructure (alpha lamellae thickness), the plastic deformation (alpha lamellae deformation) and nano-hardness variations induced by machining operation under dry and cryogenic conditions.

      PubDate: 2017-08-03T09:58:32Z
      DOI: 10.1016/j.cirpj.2016.10.004
      Issue No: Vol. 18 (2017)
  • Innovative high-speed femtosecond laser nano-patterning for improved
           adhesive bonding of Ti6Al4V titanium alloy
    • Authors: Giovanna Rotella; Leonardo Orazi; Marco Alfano; Sebastiano Candamano; Iaroslav Gnilitskyi
      Pages: 101 - 106
      Abstract: Publication date: August 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 18
      Author(s): Giovanna Rotella, Leonardo Orazi, Marco Alfano, Sebastiano Candamano, Iaroslav Gnilitskyi
      In this work the effect of femtosecond Yb fiber laser irradiation on Ti6Al4V titanium alloy is assessed. An extensive experimental campaign is carried out to survey surface properties through the use of SEM, AFM, EDS mapping and contact angle measurements. It is shown that the generation of uniform nanoscale laser induced periodic surface structures (LIPSS) allows to tailor surface properties and improves adhesive bonding with epoxy resin. The potential of the technique to improve the durability of the joints against accelerated aging is also evaluated.

      PubDate: 2017-08-03T09:58:32Z
      DOI: 10.1016/j.cirpj.2016.10.003
      Issue No: Vol. 18 (2017)
  • Conducting a metering assessment to identify submetering needs at a
           manufacturing facility
    • Authors: Prakash Rao; Michael R. Muller; Garan Gunn
      Pages: 107 - 114
      Abstract: Publication date: August 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 18
      Author(s): Prakash Rao, Michael R. Muller, Garan Gunn
      Submetering the energy consumption of processes, systems, or equipment at a manufacturing facility can provide insight into the energy efficiency and productivity of its operations. With the growth of the “Big Data” market and increasing number of submetering options, collecting data is not a challenge; collecting data that can result in actionable information leading to energy savings is a challenge. Further, as manufacturing is in the midst of the smart manufacturing and industrial analytics revolution, developing optimal submetering strategies is of increasing importance, especially if submeters are being installed as a retrofit to an existing facility/process. In particular, small to midsized manufacturing (SMM) facilities will require technical assistance to fully avail of submeter data and join the smart manufacturing revolution. This paper presents a metering assessment as a method to identify the optimal use of submeters and applications of the collected data at a manufacturing facility. The metering assessment consists of temporarily submetering energy uses to identify future metering needs. The metering assessment involves gathering data on an energy use(s) over a finite length of time, conducting analysis of the data to better understand energy consumption characteristics of the energy uses, and developing an optimal permanent submetering strategy. Through the metering assessment, a facility can better identify uses for submetered data before installing permanent submeters, thereby limiting the collection of extraneous data. Further, the facility can avail of smart manufacturing opportunities by installing submeters as a retrofit and using the collected energy data to inform operational decisions in real-time. The benefits of conducting a metering assessment are presented using an example from a SMM metal tube manufacturing facility. The results from a metering assessment conducted at the facility resolved outstanding operational issues while also identifying where permanent submetering could improve productivity. Through applying the metering assessment at an SMM facility and identifying uses of submeter data, this paper illustrates the type of technical assistance required to bring the benefits of smart manufacturing and industrial analytics to SMM facilities.

      PubDate: 2017-08-03T09:58:32Z
      DOI: 10.1016/j.cirpj.2016.10.005
      Issue No: Vol. 18 (2017)
  • Optimization of surface roughness in broaching
    • Authors: D. Fabre; C. Bonnet; J. Rech; T. Mabrouki
      Pages: 115 - 127
      Abstract: Publication date: August 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 18
      Author(s): D. Fabre, C. Bonnet, J. Rech, T. Mabrouki
      The broaching process is used to generate high quality surfaces in very short times. In order to improve the understanding of the evolution of surface quality in broaching, a sensitivity study of the influence on the surface roughness of several broaching parameters dealing with the tool design, the cutting conditions or the workpiece material was performed. Forces and chip formation have also been analyzed so as to highlight the surface roughness generation. This paper shows how the process parameters (such as cutting speed or lubrication), tool design (rise per tooth, tooth angles, substrate material), and workpiece material affects the surface roughness.

      PubDate: 2017-08-03T09:58:32Z
      DOI: 10.1016/j.cirpj.2016.10.006
      Issue No: Vol. 18 (2017)
  • Manufacturing systems: Using agents with local intelligence to maximize
           factory profit
    • Authors: Miri Weiss-Cohen; Michael Mitnovizky; Moshe Shpitalni
      Pages: 135 - 144
      Abstract: Publication date: August 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 18
      Author(s): Miri Weiss-Cohen, Michael Mitnovizky, Moshe Shpitalni
      Many of the problems of manufacturing systems, including scheduling, are NP-hard and therefore cannot be solved and optimized in real time as required in the real world. This paper investigates the possibility of controlling manufacturing systems while maximizing the enterprise profit in a stochastic and dynamically varying environment. In this research, we developed a multi-agents system that operates on the factory floor level and directly controls the manufacturing system. The paper examines the proposed multi-agents system, demonstrates its feasibility by simulation under various experimental settings, presents important findings and excellent results, and draws conclusions.

      PubDate: 2017-08-03T09:58:32Z
      DOI: 10.1016/j.cirpj.2016.11.005
      Issue No: Vol. 18 (2017)
  • Investigation on the thickness distribution of highly customized titanium
           biomedical implants manufactured by superplastic forming
    • Authors: D. Sorgente; G. Palumbo; A. Piccininni; P. Guglielmi; S.A. Aksenov
      Abstract: Publication date: Available online 6 November 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): D. Sorgente, G. Palumbo, A. Piccininni, P. Guglielmi, S.A. Aksenov
      Mechanical performances of titanium biomedical implants manufactured by superplastic forming are strongly related to the process parameters: the thickness distribution along the formed sheet has a key role in the evaluation of post-forming characteristics of the prosthesis. In this work, a finite element model able to reliably predict the thickness distribution after the superplastic forming operation was developed and validated in a case study. The material model was built for the investigated titanium alloy (Ti6Al4V-ELI) upon results achieved through free inflation tests in different pressure regimes. Thus, a strain and strain rate dependent material behaviour was implemented in the numerical model. It was found that, especially for relatively low strain rates, the strain rate sensitivity index of the investigated titanium alloy significantly decreases during the deformation process. Results on the case study highlighted that the strain rate has a strong influence on the thickness profile, both on its minimum value and on the position in which such a minimum is found.
      Graphical abstract image

      PubDate: 2017-11-09T21:53:07Z
      DOI: 10.1016/j.cirpj.2017.09.004
  • Fluid structure interaction of thin graphite electrodes during flushing
           movements in sinking electrical discharge machining
    • Authors: F. Klocke; M. Zeis; L. Heidemanns
      Abstract: Publication date: Available online 2 November 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): F. Klocke, M. Zeis, L. Heidemanns
      In sinking electrical discharge machining (SEDM) use of thin graphite electrodes with high aspect ratio sporadically results in geometrical errors. Empirically, such deviations have been attributed to the dynamic bending of electrodes arising from jump flushing movements of modern SEDM machine tools. Due to the process characteristics experimental in situ investigation of the occurring stresses and strains within the electrode appears disproportionately complex. Therefore, in this paper, bending effects are modelled taking into account fluid structure interactions. Results are validated by particle image velocimetry and high-speed camera recordings.

      PubDate: 2017-11-09T21:53:07Z
      DOI: 10.1016/j.cirpj.2017.09.003
  • Managing green house gas emission cost and pricing policies in a
           two-echelon supply chain
    • Authors: Nikunja Mohan Modak; Debabrata Kumar Ghosh; Shibaji Panda; Shib Sankar Sana
      Abstract: Publication date: Available online 1 November 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Nikunja Mohan Modak, Debabrata Kumar Ghosh, Shibaji Panda, Shib Sankar Sana
      Reduction of green house gas (GHG) emission is becoming a vital issue to protect our environment. In this point of view, industrial firms’ managers have to consider the cost of emissions trading in their policies to control GHG emission as almost all developed and developing countries of the world are now implementing some norms and penalty for GHG emission. The present article deals with a manufacturer–retailer supply chain model where cost of GHG emission during manufacturing process is taken into account. The profit functions of decentralized and centralized models are analyzed and compared considering emissions trading schemes. This study suggests to the manager of manufacturing firm who may apply two policies, shortages and adjustment of wholesale price, to reduce GHG emission. Although both policies are beneficial for GHG trading, the manufacturer prefers to allow shortages while the retailer prefers the other. Revenue sharing contract and asymmetric Nash bargaining strategy are used to resolve channel conflict and to share surplus profit between the channel members. Finally, a numerical example is presented to validate the proposed model.

      PubDate: 2017-11-02T20:47:55Z
      DOI: 10.1016/j.cirpj.2017.08.001
  • Synthesis and optimization of manufacturing systems configuration using
    • Authors: M. Abbas; H. ElMaraghy
      Abstract: Publication date: Available online 31 October 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): M. Abbas, H. ElMaraghy
      A mathematical mixed integer linear programming momdel to synthesize the manufacturing system configuration based on co-platforming strategy by mapping product platform to a corresponding machines platform is introduced. The mathematical model is verified through mathematical example and implemented in case study from automotive cylinder block manufacturer. The proposed model is beneficial in synthesizing manufacturing system to reduce investment costs by maintaining a group of platform machines that do not change with the change in product variants in different production periods. The synthesized manufacturing system platform does not change with the introduction of new product variants with new features belonging to the same product family which supports economic sustainability of manufacturing systems.

      PubDate: 2017-11-02T20:47:55Z
      DOI: 10.1016/j.cirpj.2017.09.006
  • Experimental and Thermo-Mechanical Modeling Optimization of Thermal
           Friction Drilling for AISI 304 Stainless steel
    • Authors: Sara A. El-Bahloul; Hazem E. El-Shourbagy; Ahmed M. El-Bahloul; Tawfik T. El-Midany
      Abstract: Publication date: Available online 28 October 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Sara A. El-Bahloul, Hazem E. El-Shourbagy, Ahmed M. El-Bahloul, Tawfik T. El-Midany
      The main purpose of this research is to investigate experimentally the optimal process parameters of thermal friction drilling process, based on the design of experiment method coupled with fuzzy logic and analysis of variance techniques, considering the resultant axial force and bushing length. A friction drilling machine is designed, and manufactured in Shoman Company — Egypt to perform the experimental work, and the tools are offered by Flowdrill Company — Netherlands. A temperature-dependent dynamic explicit modeling is applied, considering adaptive meshing, element deletion, and mass scaling techniques. The resultant optimal parameter levels combination is: 9.2mm tool diameter, 30° friction angle, 50% friction contact area ratio, 60mm/min feed rate, and 3500rpm rotational speed. A comparison is performed between the experimental and thermo-mechanical modeling results, considering the axial force, and a similar trend is achieved. Also a regression analysis is applied to predict the expected axial force and bushing length and confirmed by confirmation test.

      PubDate: 2017-11-02T20:47:55Z
      DOI: 10.1016/j.cirpj.2017.10.001
  • Analysis of micro-EDM electric characteristics employing plasma property
    • Authors: A.B.M.A. Asad; M. Tanjilul Islam; Takeshi Masaki; M. Rahman; Y.S. Wong
      Abstract: Publication date: Available online 26 October 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): A.B.M.A. Asad, M. Tanjilul Islam, Takeshi Masaki, M. Rahman, Y.S. Wong
      Micro-electro discharge machining (micro-EDM) involves simultaneous complex processes associated with electrical characteristics and plasma properties, which lead to the removal of material from both electrode and workpiece. Unfortunately, existing micro-EDM models are simple electro-thermal based and not capable to connect the link between plasma and electrical circuit. This article presents a theoretical study to model the electric properties of micro-EDM plasma discharge for RC power supply with direct current (DC) source. Analysis presented in this study provides significant insight for realizing changes in the current waveform due to changes in parameters like input voltage, capacitance, inductance and the charging resistance. This research bridges a crucial gap in the present theoretical understanding on the interaction of micro-EDM plasma with different circuit elements of micro-EDM power supply. Furthermore, by employing this proposed model, a novel stray capacitance measurement method has been presented to adjust pulse energy at minimum level for smallest machinable features. The robustness of the analytical model is substantiated by validating it on multiple experimental results of measured data as well as literature data.

      PubDate: 2017-11-02T20:47:55Z
      DOI: 10.1016/j.cirpj.2017.09.005
  • On thermal modeling of Additive Manufacturing processes
    • Authors: Panagis Foteinopoulos; Alexios Papacharalampopoulos; Panagiotis Stavropoulos
      Abstract: Publication date: Available online 24 October 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Panagis Foteinopoulos, Alexios Papacharalampopoulos, Panagiotis Stavropoulos
      A two-dimensional Finite Difference (FD) model of the thermal history of parts manufactured in powder bed fusion Additive Manufacturing (AM) processes is presented. The temperature of the part is calculated in each time-step taking into account the moving laser heat source, the melting phase change and functions of both temperature and porosity are used for the material thermal properties. Also, an algorithm for node birth and distance adaptation over time is utilized, minimizing computational time and memory. A validation of the results of the model is included.

      PubDate: 2017-10-25T19:43:35Z
      DOI: 10.1016/j.cirpj.2017.09.007
  • Stabilizing production ramp-up by modeling uncertainty for product design
           verification using Dempster–Shafer theory
    • Authors: Jan Kukulies; Robert Schmitt
      Abstract: Publication date: Available online 23 October 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Jan Kukulies, Robert Schmitt
      Unplanned product-related engineering changes are a major field of disturbance for production ramp-up. Numerous of them can be traced back to deficits in design verification conducted during precedent product development. The present paper provides a conceptual methodology for planning design verification activities based on the quantification of uncertainties. By identifying and modeling information sources regarding the true value of a functional product characteristics, uncertainties regarding functional requirement fulfillment can be modeled in order to plan necessary design verification activities. The uncertainty modeling is based on the common ESReDA-framework as well as recent approaches using Dempster–Shafer theory.

      PubDate: 2017-10-25T19:43:35Z
      DOI: 10.1016/j.cirpj.2017.09.008
  • Experimental characterization and finite element modeling of through
           thickness deformation gradient in a cold rolled zirconium sheet
    • Authors: Gulshan Kumar; Arijit Lodh; Jaiveer Singh; Ramesh Singh; D. Srivastava; G.K. Dey; I. Samajdar
      Abstract: Publication date: Available online 12 October 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Gulshan Kumar, Arijit Lodh, Jaiveer Singh, Ramesh Singh, D. Srivastava, G.K. Dey, I. Samajdar
      A commercial Zirconium alloy was subjected to different thickness reductions (20%, 40% and 60%) by cold rolling. A through-thickness gradient in microstructure, crystallographic texture and residual stress was observed. This gradient was till 1/8th of the specimen thickness, and implied a corresponding anisotropy in the imposed strain state. An elasto-plastic FE (finite element) model was developed to capture such through thickness deformation gradients. A reasonably good agreement was observed between the experimental and predicted residual stress distributions when the material anisotropy was accounted for. Through-thickness residual stress evolution was shown to be significantly affected by material anisotropy and to a lesser extent by the rolling parameters (coefficient of friction and rotational speed).

      PubDate: 2017-10-13T17:51:37Z
      DOI: 10.1016/j.cirpj.2017.09.002
  • A cyber-physical system for quality-oriented assembly of automotive
           electric motors
    • Authors: M. Colledani; D. Coupek; A. Verl; J. Aichele; A. Yemane
      Abstract: Publication date: Available online 12 October 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): M. Colledani, D. Coupek, A. Verl, J. Aichele, A. Yemane
      The production of motors for the electric vehicles requires innovative and systematic quality control approaches to boost efficiency while moving from low volume towards mass production. In this context, end-of-line quality testing methods are usually applied to assess the product functionality at the end of the process chain. However, this approach does not allow process monitoring and the in-line prevention and correction of defects, leading to significant scrap rates and value losses. This paper presents a new system-level strategy for the in-line quality-oriented assembly of rotors in the production of automotive electric drives. The new strategy is based on a new cyber-physical system that optimizes the assembly strategy depending on the quality of magnetized stacks, monitored with data gathered by in-line inspection. For each batch, the magnetic stacks to be assembled and their orientation is selected according to an optimization algorithm, aiming at minimizing the deviation from the target total integral magnetic flux and maximizing the field uniformity in the magnetized rotor. The impact of the proposed strategy on the quality and productivity related performance measures are predicted by analytical methods. Experimental results based on an industrial case study are reported, showing that the application of the proposed strategy yields a significant increase in the production rate of conforming engines. The proposed approach paves the way to innovative zero-defect manufacturing strategies at system level in emerging, high-tech, manufacturing sectors.

      PubDate: 2017-10-13T17:51:37Z
      DOI: 10.1016/j.cirpj.2017.09.001
  • A simple and robust setup planning scheme for prismatic workpieces
    • Authors: H. Hajimiri; M.H. Siahmargouei; H. Ghorbani; M. Shakeri
      Abstract: Publication date: Available online 27 September 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): H. Hajimiri, M.H. Siahmargouei, H. Ghorbani, M. Shakeri
      Computer Aided Process Planning (CAPP) is a link between Computer Aided Design (CAD) and Computer Aided Manufacturing (CAM). Setup planning is the main function to integrate the designing and manufacturing processes. Despite significant progresses in the modern manufacturing, setup planning is still being considered an experience based activity. Its reason can be fixturing constraints, tolerance requirements (specially stack-up in tolerancing), geometric relationships among machining features, and Tool Approach Direction (TAD). All aforementioned limitations introduce setup planning as a complicated nonlinear task. Setup planning not only determines features must be machined in each setup but also defines locating datum for each setup. This study focuses on the development of a simple and easy-understanding series of steps to generate feasible setups. Tolerance stack-up has been eliminated using datum face as a reference plane in the fixture design. Three concepts namely “control face”, “control factor”, and “machining priority” have been employed for this aim. The capability of proposed scheme has been proved by applying it on two practical case studies. The suggested algorithm has successfully reduced the number of setups from 7 to 6, which is the least number of achievable setups and shows its sufficiency.

      PubDate: 2017-10-04T17:33:08Z
      DOI: 10.1016/j.cirpj.2017.07.002
  • Online-scheduling using past and real-time data. An assessment by discrete
           event simulation using exponential smoothing
    • Authors: Jens Heger; Sebastian Grundstein; Michael Freitag
      Abstract: Publication date: Available online 18 September 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Jens Heger, Sebastian Grundstein, Michael Freitag
      Often deviations occur in the execution of a production schedule because prediction of productivity is unrealistic. Therefore, researchers have shown huge interest in understanding and modelling productivity factors to consider them in planning and design of manufacturing systems. In contrast, this paper examines how productivity can be considered in online-scheduling using past and real-time data and which effect this has on the overall system performance. The discrete event simulation exemplarily considering human productivity factors shows promising results but also the need for more complex forecasting methods Future work will also consider other factors such as tool wear and disturbances.

      PubDate: 2017-10-04T17:33:08Z
      DOI: 10.1016/j.cirpj.2017.07.003
  • Microstructured scaffold for guided cellular orientation:
    • Authors: P.S. Ginestra; S. Pandini; A. Fiorentino; P. Benzoni; P. Dell’Era; E. Ceretti
      Abstract: Publication date: Available online 8 September 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): P.S. Ginestra, S. Pandini, A. Fiorentino, P. Benzoni, P. Dell’Era, E. Ceretti
      Many processes have been considered for fabricating scaffolds including additive manufacturing, electrodeposition and electrospinning. Among them, electrospinning is gaining attention because of its simplicity and the possibility to realize nano-scale fibers in a wide range of materials. In this paper, micro-structures were laser ablated on titanium collectors for the electrospinning process to obtain micro-patterned scaffolds. The results show the capability and the precision of the process in replicating the micro-scale features by electrospinning technology. Moreover, L6 rat myoblasts were seeded on different patterned scaffolds and results show how it is possible to control cells orientation by choosing the proper micro-pattern.

      PubDate: 2017-10-04T17:33:08Z
      DOI: 10.1016/j.cirpj.2017.08.002
  • A methodology for online visualization of the energy flow in a machine
    • Authors: Ali Mohammadi; Simon Züst; Josef Mayr; Philip Blaser; Mads Rostgaard Sonne; Jesper Henri Hattel; Konrad Wegener
      Abstract: Publication date: Available online 6 September 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Ali Mohammadi, Simon Züst, Josef Mayr, Philip Blaser, Mads Rostgaard Sonne, Jesper Henri Hattel, Konrad Wegener
      The demand of energy efficient machine tools has increased recently due to the awareness for energy efficient production in precision manufacturing. A portion of the energy supplied to machine tools is transferred to thermal losses which influence also the thermal behavior of the precision related machine tools components. Machine cooling and process cooling can prevent thermal machine tool errors. However this further requires considerable amounts of energy. Hence there is a demand to monitor the electric, thermal, fluidic and mechanical energy flows in the machine tool in order to optimize the machining process and by this increasing its energy efficiency. This study intents to propose a method which has the capability of real-time monitoring of the entire energetic flows in a CNC machine tool including motors, pumps and cooling fluid. The structure of this approach is based on categorizing the machine into subsystems and measurements of the consumers (pump, motors, …) power, temperature at the inlet and outlet of the pumps and current as well as the speed of the motors. The visualization is carried out by a 2D Sankey diagram, which makes it easy to understand the energetic flows in the machine tool. The methodology is verified by the rule of energy conversion which confirms the capability of this method on real-time energy monitoring of a machine tool.

      PubDate: 2017-10-04T17:33:08Z
      DOI: 10.1016/j.cirpj.2017.08.003
  • Development and application of a test rig for tribological investigations
           under impact loads
    • Authors: Florian Böhmermann; Oltmann Riemer
      Abstract: Publication date: Available online 17 August 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Florian Böhmermann, Oltmann Riemer
      The investigation and the understanding of frictional mechanisms occurring between forming dies and work pieces in tribological contact is the prerequisite for the development of novel, dry bulk metal forming processes such as dry rotary swaging. The capability to conduct tribological investigations within the actual forming processes, however, is strongly limited, e.g. due to the limited accessibility of force measurement equipment. This work presents the development and application of a tribological test rig mimicking typical contact geometries and high impact loads associated with infeed rotary swaging for process-independent tribological investigations. The development comprises the designing process based on rotary swaging process simulations, setup assembly, and calibration procedure. Subsequently, the functionality of the test rig was demonstrated successfully, determining the distinct frictional properties under lubricated and dry conditions of various samples with structured surfaces representative for rotary swaging dies.

      PubDate: 2017-10-04T17:33:08Z
      DOI: 10.1016/j.cirpj.2017.07.004
  • A review of Additive Manufacturing technology and Cost Estimation
           techniques for the defence sector
    • Authors: Alessandro Busachi; John Erkoyuncu; Paul Colegrove; Filomeno Martina; Chris Watts; Richard Drake
      Abstract: Publication date: Available online 8 August 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Alessandro Busachi, John Erkoyuncu, Paul Colegrove, Filomeno Martina, Chris Watts, Richard Drake
      “Additive Manufacturing” (AM) is a promising technology which will provide major advantages to Defence Support Service providers, given its ability of delocalised manufacturing near the point of use. The technology is gaining increasing interest due to its disruptive potential. AM groups together a wide range of different approaches which have the ability to convert a 3D file into a physical product by depositing layer upon layer of material. AM is still under development and considered an immature technology. This immaturity provides high level of uncertainty around key indicators such as time and cost. These indicators represent also key decision variables to evaluate AM and compare it with traditional manufacturing. This review paper represents an investigation of existing knowledge on AM and aims to present to the reader the various AM approaches with a detailed focus on the most applicable technologies to Defence Support Services. The paper is structured as follows, firstly the various technologies of AM and their economic aspects are presented, secondly the cost modelling techniques are investigated and finally a discussion is carried out. The contribution of this paper is to present to Defence Support Service stakeholders the various AM technologies and cost modelling techniques for measuring the product or service cost.

      PubDate: 2017-10-04T17:33:08Z
      DOI: 10.1016/j.cirpj.2017.07.001
  • Tool orientation optimization of 5-axis ball-end milling based on an
           accurate cutter/workpiece engagement model
    • Authors: Xing Zhang; Jun Zhang; Xiaowei Zheng; Bo Pang; Wanhua Zhao
      Abstract: Publication date: Available online 21 July 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Xing Zhang, Jun Zhang, Xiaowei Zheng, Bo Pang, Wanhua Zhao
      Tool orientation in 5-axis ball-end milling plays a significant role in machining efficiency and accuracy. The cutter/workpiece engagement varies with tool orientation continuously including lead and tilt angles during machining, which results in the obvious time-varying characteristic for consecutive cutting forces. Considering tool orientation, actual cutter runout and cutter motion process, an accurate calculation model for instantaneous cutter/workpiece engaging process in 5-axis ball-end milling is proposed based on an improved analytical method with high order Taylor formula, which can reach an excellent accuracy. Then base on the cutting force model, the tool orientation optimization strategies with a flexible cutter and rigid workpiece for roughing and finishing milling operation are further presented. For the three kinds of geometrical characteristic (plane, cylindrical and spherical surface), this study analyzes the influence of tool lead and tilt angles, and step over on the maximum cutting force and form error, and finally obtains an optimal tool orientation to realize a high efficiency and accuracy machining.

      PubDate: 2017-07-24T09:11:06Z
      DOI: 10.1016/j.cirpj.2017.06.003
  • A novel comparative design procedure for reconfigurable assembly fixtures
    • Authors: Ilker Erdem; Christoffer Levandowski; Cecilia Berlin; Henrik Kihlman; Johan Stahre
      Abstract: Publication date: Available online 18 July 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Ilker Erdem, Christoffer Levandowski, Cecilia Berlin, Henrik Kihlman, Johan Stahre
      While market requirements demand that manufacturing systems increase their responsiveness, assembly fixtures remain limited in corresponding to the same demand. Fixture designers as practitioners are left without guidance to design reconfigurable fixtures. This study proposes a comparative design procedure for reconfigurable assembly fixtures that can adapt to manufacturing system characteristics by using efficiency metrics. In this study, a theoretical analysis based on manufacturing systems is presented to establish efficiency metrics. Later, these metrics are utilized in a design procedure that offers guidance and determines the efficiency of fixtures in conceptual and detailed design stages. Finally, an experimental verification is presented.

      PubDate: 2017-07-24T09:11:06Z
      DOI: 10.1016/j.cirpj.2017.06.004
  • Industrial survey of ISO surface texture parameters
    • Authors: L.D. Todhunter; R.K. Leach; S.D.A. Lawes; F. Blateyron
      Abstract: Publication date: Available online 1 July 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): L.D. Todhunter, R.K. Leach, S.D.A. Lawes, F. Blateyron
      Results of an international survey are presented, detailing the use of surface texture parameters in industry. The survey received 179 responses from a total of 34 countries, revealing the use of a variety of parameters from ISO 4287, ISO 12085, ISO 13565-2/3 and ISO 25178-2. The survey responses show an increase in the number of users of profile parameters, and an increase in the range of surface texture parameters used, compared to the results from a similar survey in 1999, as well as a significant uptake of the new areal surface texture parameters. Individual sector usage is also discussed.

      PubDate: 2017-07-03T08:37:08Z
      DOI: 10.1016/j.cirpj.2017.06.001
  • A multi-objective software tool for manual assembly line balancing using a
           genetic algorithm
    • Authors: M. Dalle Mura; G. Dini
      Abstract: Publication date: Available online 29 June 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): M. Dalle Mura, G. Dini
      This paper proposes a new genetic algorithm approach for solving a multi-objective assembly line balancing problem. The objectives concern the minimization of the number of workstations and the workload variance, typically faced by most systems presented in literature, but also the minimization of three further aspects, not simultaneously treated in literature and very important in manual assembly lines: the number of skilled workers among workstations, the number of assembly equipment (e.g.: automatic screwdrivers, pressing machines, etc.) and the number of assembly direction changes along the sequence. To demonstrate the effectiveness of the proposed method in finding optimized assembly sequences, a classical case study taken from the literature is finally discussed.

      PubDate: 2017-07-03T08:37:08Z
      DOI: 10.1016/j.cirpj.2017.06.002
  • Evaluation and modeling of the energy demand during machining
    • Authors: Markus Rief; Bernhard Karpuschewski; Eckehard Kalhöfer
      Abstract: Publication date: Available online 20 June 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Markus Rief, Bernhard Karpuschewski, Eckehard Kalhöfer
      This paper deals with the creation of a holistic and easy to use model for predicting energy use during machining operations. The created model offers the process planner the possibility to determine the electrical power demand of the machining operation before actual machining occurs. After checking the model results, the process planner is able to change many of the process parameters. With the new NC file, the model can be used again for evaluating the related energy demand. The first step for setting up such a model is to understand what factors influence the power demand for the machining operation. Step two is the measuring of these factors and setting up a suitable model with each variable that can influence the energy demand. In the end, the electrical energy demand for the machining process of a certain part can be predicted with sufficient accuracy.

      PubDate: 2017-06-22T08:28:30Z
      DOI: 10.1016/j.cirpj.2017.05.003
  • Development of an adaptive, self-learning control concept for an additive
           manufacturing process
    • Authors: Volker Renken; Stephan Albinger; Gert Goch; Arne Neef; Claus Emmelmann
      Abstract: Publication date: Available online 12 June 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Volker Renken, Stephan Albinger, Gert Goch, Arne Neef, Claus Emmelmann
      Error avoidance in high-precision manufacturing processes becomes more important for numerous state-of-the-art technologies. Selective laser melting is one of these technologies offering large potentials in the production of complex and flexible metal products. As the technology is relatively new, it is vulnerable for errors, given that the process parameters are not measured yet. A novel multilevel control concept, incorporating several sensors, has the potential to reduce errors significantly. For inner cascade control, the laser power will be adjusted by measurements with an intensity sensor for wavelengths in the visible range. This sensor is integrated into the optical path of the laser beam. An adapted self-learning strategy supports the stability of the process by updating the parameters of the used multidimensional model in order to attenuate environmental influences or shifts within the process. This work presents the concept of the control approach, first measurement results and the required relations between measurement, process and control parameters.

      PubDate: 2017-06-17T08:18:41Z
      DOI: 10.1016/j.cirpj.2017.05.002
  • A design approach for safety based on Product-Service Systems and
    • Authors: Leyla Sadeghi; Jean-Yves Dantan; Luc Mathieu; Ali Siadat; Mohammad Mohsen Aghelinejad
      Abstract: Publication date: Available online 12 June 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Leyla Sadeghi, Jean-Yves Dantan, Luc Mathieu, Ali Siadat, Mohammad Mohsen Aghelinejad
      Design for human safety is a complex issue because of the variability of human activities, machines and their environment as well as the variability of possible interactions between these components. The work situation is comprised of the means and the person(s) who act to carry out task(s) in a working environment in accordance with the conditions set for carrying out the task(s). The work situation can generate the hazardous conditions and undesirables events lead to harm. This paper deals with the work situation identifying and analyzing during design to improve safety. Product-Service System (PSS), which is an integrated combination of products and services that shift from product and service systems to Product-Service Systems has been used. The Function–Behavior–Structure (FBS), which covers behavior, is considered to include product and its utilization. The interaction between PSS and FBS, proposed in present paper, allows considering product behaviors and its interaction with service activities. This allows to distinguish the realization of functions by a product part, a service part or a combination of both. The analysis of this interaction is helpful for work situation analysis. Product and service behaviors modeling also are proposed in order to help this analysis. The applicability of the proposed approach is demonstrated through the application to the Power Take-Off (PTO) drive shaft.

      PubDate: 2017-06-17T08:18:41Z
      DOI: 10.1016/j.cirpj.2017.05.001
  • Experimental investigation of energy distribution in continuous sinking
    • Authors: K. Oßwald; S. Schneider; L. Hensgen; A. Klink; F. Klocke
      Abstract: Publication date: Available online 30 May 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): K. Oßwald, S. Schneider, L. Hensgen, A. Klink, F. Klocke
      Investigations into the fundamentals of the EDM process are often facing significant challenges due to the very small spatial and temporal scales in which it takes place. This also applies to the research on the distribution of the electrical energy of the discharges. This paper presents a novel method for the detailed experimental analysis of the energy distribution in continuous sinking EDM processes. For this purpose, sophisticated measurement methods for temperatures and electrical quantities were combined. Thus, the experimental setup was very close to realistic process conditions. The results of the obtained temperature profiles and the derived energy distribution are presented followed by variations of process parameters and a critical discussion to explain deviations.

      PubDate: 2017-06-02T09:06:13Z
      DOI: 10.1016/j.cirpj.2017.04.006
  • Industrial compressed air system analysis: Exergy and thermoeconomic
    • Authors: Kamran Taheri; Rainer Gadow
      Abstract: Publication date: Available online 24 May 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Kamran Taheri, Rainer Gadow
      In manufacturing, compressed air systems generate, store and distribute energy in the form of compressed air for use throughout facilities. However, compressed air is considered as one of the most expensive energy carriers which is accompanied with very high inefficiencies and losses. According to the thermodynamic concept of technical work, the delivered mechanical work to the consumers and pneumatic drives by the compressed air is influenced by the change of the pressure and flow rate of compressed air. Therefore, it is promising to minimize the losses regarding these parameters. It has been argued that exergy concept is more suitable for evaluation of the efficiency of the compressed air system compared to the energy analysis. Exergy analysis can highlight and classify internal (irreversibilities) as well as external (waste heat) losses. In this study, in the context of sustainable manufacturing, compressed air system is evaluated based on energy consumption, exergy efficiency and thermoeconomics. Therefore, exergy weighted sum (EWS) is introduced as an analysis factor which encompasses all the above analysis criteria for the energy efficiency optimization decision support. It is emphasized that EWS can be used for evaluation and comparison of the alternative improvement scenarios or technologies. The results of exergy weighted sum indicate that recovery of the waste heat as well as reduction of air leaks are the best energy efficiency optimization scenarios regarding the power consumption, exergy efficiency and thermoeconomics for the investigated compressed air system.

      PubDate: 2017-05-28T08:52:38Z
      DOI: 10.1016/j.cirpj.2017.04.004
  • Reference architecture to integrate heterogeneous manufacturing systems
           for the digital thread
    • Authors: Moneer Helu; Thomas Hedberg; Allison Barnard Feeney
      Abstract: Publication date: Available online 22 May 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Moneer Helu, Thomas Hedberg, Allison Barnard Feeney
      The increasing growth of digital technologies in manufacturing has provided industry with opportunities to improve its productivity and operations. One such opportunity is the digital thread, which links product lifecycle systems so that shared data may be used to improve design and manufacturing processes. The development of the digital thread has been challenged by the inherent difficulty of aggregating and applying context to data from heterogeneous systems across the product lifecycle. This paper presents a reference four-tiered architecture designed to manage the data generated by manufacturing systems for the digital thread. The architecture provides segregated access to internal and external clients, which protects intellectual property and other sensitive information, and enables the fusion of manufacturing and other product lifecycle data. We have implemented the architecture with a contract manufacturer and used it to generate knowledge and identify performance improvement opportunities that would otherwise be unobservable to a manufacturing decision maker.

      PubDate: 2017-05-23T12:42:21Z
      DOI: 10.1016/j.cirpj.2017.04.002
  • Designing a Cellular Manufacturing System featuring remanufacturing,
           recycling, and disposal options: A mathematical modeling approach
    • Authors: Tariq Aljuneidi; Akif A. Bulgak
      Abstract: Publication date: Available online 21 May 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Tariq Aljuneidi, Akif A. Bulgak
      While “sustainability” in the manufacturing sector is becoming a pivotal issue, one should consequently expect a growing research interest in design problems in “Sustainable Manufacturing Systems” (SMSs). When a product ceases to be of any further use to the customer in it is current condition, it is relinquished. Accordingly, there is a need for a product recovery options in a sustainable environment. Recycling and remanufacturing are the most two advanced product recovery options. An efficient recycling and remanufacturing network leads to an efficient design of Sustainable Manufacturing enterprise. This article presents a simultaneous investigation of Reconfigurable Cellular Manufacturing Systems and Hybrid Manufacturing-Remanufacturing Systems (HMRSs), and proposes an integrated approach in design optimization, analysis, and process planning aspects as an attempt to address to a large number of design issues for Sustainable Manufacturing Systems. The options of remanufacturing, recycling, and disposing are introduced. A mixed integer linear programming (MILP) model, which considers a classical cell formation problem in Cellular Manufacturing Systems (CMSs), bridged with a production planning problem, in Hybrid Manufacturing-Remanufacturing Systems, while addressing to “reconfiguration” issues for the CMS for different production periods, has been developed. A numerical example is presented to illustrate the proposed model.

      PubDate: 2017-05-23T12:42:21Z
      DOI: 10.1016/j.cirpj.2017.04.005
  • Single-crystal turbine blade tip repair by laser cladding and remelting
    • Authors: Stefan Kaierle; Ludger Overmeyer; Irene Alfred; Boris Rottwinkel; Jörg Hermsdorf; Volker Wesling; Nils Weidlich
      Abstract: Publication date: Available online 20 May 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Stefan Kaierle, Ludger Overmeyer, Irene Alfred, Boris Rottwinkel, Jörg Hermsdorf, Volker Wesling, Nils Weidlich
      High pressure single-crystal turbine blades made from nickel-based superalloys can withstand temperatures of up to 1100°C due to their superior creep and fatigue properties compared to polycrystalline material. However, these parts undergo erosion and cracking due to the extreme conditions they are subject to in the engines of commercial airplanes. Since there is no effective method of repairing these expensive parts, while maintaining the necessary microstructure, the need to develop and establish a reproducible process is of high importance. The process of Laser Material Deposition (LMD) has shown promising results in the building-up of single-crystal or directionally solidified structures, while laser remelting has been shown to extend this monocrystalline height. By combining the two processes, this study aimed to deposit and remelt single-crystal structures on substrates of the nickel-based superalloys CMSX-4 and turbine blade tips of PWA 1426. Experiments were carried out to establish laser parameters that resulted in a monocrystalline microstructure. This study showed that the combination of cladding and remelting can be used to deposit single-crystal structures and was able to establish a reproducible laser process to this effect. The results obtained indicate that the process is a promising candidate for the repair of turbine blade tips and warrants further research into the microstructure and thermomechanical properties of the repaired areas.

      PubDate: 2017-05-23T12:42:21Z
      DOI: 10.1016/j.cirpj.2017.04.001
  • Study on factors for pores and cladding shape in the deposition processes
           of Inconel 625 by the directed energy deposition (DED) method
    • Authors: Makoto Fujishima; Yohei Oda; Ryo Ashida; Kotaro Takezawa; Masaki Kondo
      Abstract: Publication date: Available online 16 May 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Makoto Fujishima, Yohei Oda, Ryo Ashida, Kotaro Takezawa, Masaki Kondo
      Additive manufacturing has been utilized recently for prototyping and mass production of parts especially in the aerospace and medical industries. Most of the parts are processed by the powder bed fusion (PBF) method. On the other hand, the directed energy deposition (DED) method is attractive due to the high deposition speed. However, various parameters must be set for deposition processes and how these parameter settings affect the quality of products in terms of pores and machine properties have not been clarified. This paper studies factors contributing to pore generation in the deposition processes of Inconel 625 by the DED method. First, tests for deposition processes in single layer and multiple layers were conducted under various depositing conditions by changing the laser output and the amount of powder. The test results have clarified depositing conditions where less pores are generated, differences in hardness by deposited position, and the factors for those differences.

      PubDate: 2017-05-18T12:11:47Z
      DOI: 10.1016/j.cirpj.2017.04.003
  • Influence of the tool profile on the wear behaviour in gear hobbing
    • Authors: Bernhard Karpuschewski; Martin Beutner; Max Köchig; Christian Härtling
      Abstract: Publication date: Available online 3 January 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Bernhard Karpuschewski, Martin Beutner, Max Köchig, Christian Härtling
      Being the dominating green manufacturing technique to create external gears gear hobbing is of major industrial importance. The technology is characterized by a simultaneous superposition of kinematics and tool profile. Even though these tool profiles are standardized, in industries they are regularly being altered to fit the gear designer's demands regarding strength and contact ratio. Cutting gears with these modified and partly extreme tool profiles some geometries show critical wear behaviour. Despite existing experience-based knowledge, no systematic knowledge base is available. Therefore, this paper summarizes geometrical influences of the tool profile on the wear mechanisms. A variety of different tool profiles and gear geometries were tested within the fly cutting analogy test. The effects were also studied by means of FEM-simulation and interpenetration simulation. Finally, the wear phenomena were matched with load parameters.

      PubDate: 2017-01-06T19:16:15Z
      DOI: 10.1016/j.cirpj.2016.11.002
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