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  Subjects -> ENGINEERING (Total: 2284 journals)
    - CHEMICAL ENGINEERING (192 journals)
    - CIVIL ENGINEERING (184 journals)
    - ELECTRICAL ENGINEERING (102 journals)
    - ENGINEERING (1208 journals)
    - ENGINEERING MECHANICS AND MATERIALS (389 journals)
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    - INDUSTRIAL ENGINEERING (65 journals)
    - MECHANICAL ENGINEERING (89 journals)

ENGINEERING (1208 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: 5)
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: 227)
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: 6)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Artificial Neural Systems     Open Access   (Followers: 4)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 14)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 10)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 20)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 25)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Polymer Science     Hybrid Journal   (Followers: 40)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 37)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 1)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
AIChE Journal     Hybrid Journal   (Followers: 29)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
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: 16)
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: 7)
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: 9)
Applied Clay Science     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3)
Applied Nanoscience     Open Access   (Followers: 7)
Applied Network Science     Open Access  
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: 4)
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: 7)
Arid Zone Journal of Engineering, Technology and Environment     Open Access  
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
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: 8)
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: 3)
Batteries     Open Access   (Followers: 4)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 23)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 3)
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: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 9)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 32)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 3)
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  
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: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 14)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 41)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 7)
Case Studies in Thermal Engineering     Open Access   (Followers: 3)
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: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 5)
CEAS Space Journal     Hybrid Journal  
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: 21)
Clay Minerals     Full-text available via subscription   (Followers: 9)
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: 4)
Coatings     Open Access   (Followers: 3)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
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: 26)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 256)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 179)
Composites Part B : Engineering     Hybrid Journal   (Followers: 227)
Composites Science and Technology     Hybrid Journal   (Followers: 197)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 13)
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: 6)
Computer Science and Engineering     Open Access   (Followers: 17)
Computers & Geosciences     Hybrid Journal   (Followers: 28)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 10)
Computing and Visualization in Science     Hybrid Journal   (Followers: 5)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 29)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 8)
Control Engineering Practice     Hybrid Journal   (Followers: 42)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 25)
CT&F Ciencia, Tecnologia y Futuro     Open Access  

        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  [3042 journals]
  • A novel approach for No Fault Found decision-making
    • Authors: Samir Khan; Michael Farnsworth; John Erkoyuncu
      Pages: 18 - 31
      Abstract: Publication date: May 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 17
      Author(s): Samir Khan, Michael Farnsworth, John Erkoyuncu
      Within aerospace and defence sectors, organisations are adding value to their core corporate offerings through services. These services tend to emphasise the potential to maintain future revenue streams and improved profitability and hence require the establishment of cost effective strategies that can manage uncertainties within value led services e.g. maintenance activities. In large organisations, decision-making is often supported by information processing and decision aiding systems; it is not always apparent whose decision affects the outcome the most. Often, accountability moves away from the designated organisation personnel in unforeseen ways, and depending on the decisions of individual decision makers, the structure of the organisation, or unregulated operating procedures may change. This can have far more effect on the overall system reliability – leading to inadequate troubleshooting, repeated down-time, reduced availability and increased burden on Through-life Engineering Services. This paper focuses on outlining current industrial attitudes regarding the No Fault Found (NFF) phenomena and identifies the drivers that influence the NFF decision-making process. It articulates the contents of tacit knowledge and addresses a knowledge gap by developing NFF management policies. The paper further classifies the NFF phenomenon into five key processes that must be controlled by using the developed policies. In addition to the theoretical developments, a Petri net model is also outlined and discussed based on the captured information regarding NFF decision-making in organisations. Since NFF decision-making is influenced by several factors, Petri nets are sought as a powerful tool to realise a meta-model capability to understand the complexity of situations. Its potential managerial implications can help describe decision problems under conditions of uncertainty. Finally, the conclusions indicate that engineering processes, which allow decision-making at various maintenance echelons, can often obfuscate problems that then require a systems approach to illustrate the impact of the issue.

      PubDate: 2017-05-13T11:33:42Z
      DOI: 10.1016/j.cirpj.2016.05.011
      Issue No: Vol. 17 (2017)
       
  • Mitigating change in the goals and context of capital assets: Design of
           the Lifetime Impact Identification Analysis
    • Authors: R.J. (Richard) Ruitenburg; A.J.J. (Jan) Braaksma
      Pages: 50 - 59
      Abstract: Publication date: May 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 17
      Author(s): R.J. (Richard) Ruitenburg, A.J.J. (Jan) Braaksma
      Physical assets are essential in manufacturing, and typically have lifetimes of several decades. Over such a period, many changes in goals and context may occur. Such changes should be dealt with to prevent a premature end to the asset's useful life. However, current maintenance methodologies focus mainly on the short term and on operation in a stable context. Based on a case study of Asset Management practices and the literature, we developed the Lifetime Impact Identification Analysis (LIIA) method. The method uses Technical, Economic, Compliance and Commercial perspectives to identify long-term challenges and opportunities for the asset.

      PubDate: 2017-05-13T11:33:42Z
      DOI: 10.1016/j.cirpj.2016.05.008
      Issue No: Vol. 17 (2017)
       
  • The detection of wind turbine shaft misalignment using temperature
           monitoring
    • Authors: Oliver Tonks; Qing Wang
      Pages: 71 - 79
      Abstract: Publication date: May 2017
      Source:CIRP Journal of Manufacturing Science and Technology, Volume 17
      Author(s): Oliver Tonks, Qing Wang
      Temperature is a parameter increasingly monitored in wind turbine systems. This paper details a potential temperature monitoring technique for use on shaft couplings. Such condition monitoring methods aid fault detection in other areas of wind turbines. However, application to shaft couplings has not previously been widely researched. A novel temperature measurement technique is outlined, using an infra-red thermometer which can be applied to online condition monitoring. The method was validated and investigated through real time shaft alignment tests. Different modes of misalignment including offset and angular were investigated. This allowed analysis of the relationship between a change in shaft alignment and a change in temperature. The rate of change was found to be a factor of condition through exploring changes in ambient and operating temperatures. The test rig allowed quantification on a small scale and potential causes and effects of temperature changes are discussed.

      PubDate: 2017-05-13T11:33:42Z
      DOI: 10.1016/j.cirpj.2016.05.001
      Issue No: Vol. 17 (2017)
       
  • 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
           Function–Behavior–Structure
    • 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
           EDM
    • 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
           analysis
    • 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
       
  • 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
      Abstract: Publication date: Available online 6 April 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      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: 2017-04-12T14:49:55Z
      DOI: 10.1016/j.cirpj.2017.03.001
       
  • Unlocking water efficiency improvements in manufacturing — From
           approach to tool support
    • Authors: D. Kurle; C. Herrmann; S. Thiede
      Abstract: Publication date: Available online 16 March 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      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: 2017-03-17T13:14:05Z
      DOI: 10.1016/j.cirpj.2017.02.004
       
  • Fundamental mechanisms in orthogonal cutting of medical grade cobalt
           chromium alloy (ASTM F75)
    • Authors: Eamonn Ahearne; Szymon Baron
      Abstract: Publication date: Available online 7 March 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      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: 2017-03-09T21:25:11Z
      DOI: 10.1016/j.cirpj.2017.02.001
       
  • Effect of HM substrates’ cutting edge roundness manufactured by laser
           machining and micro-blasting on the coated tools’ cutting performance
    • Authors: K.-D. Bouzakis; P. Charalampous; T. Kotsanis; G. Skordaris; E. Bouzakis; B. Denkena; B. Breidenstein; J.C. Aurich; M. Zimmermann; T. Herrmann; R. M’saoubi
      Abstract: Publication date: Available online 7 March 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): K.-D. Bouzakis, P. Charalampous, T. Kotsanis, G. Skordaris, E. Bouzakis, B. Denkena, B. Breidenstein, J.C. Aurich, M. Zimmermann, T. Herrmann, R. M’saoubi
      The effective application of laser machining for manufacturing the cutting edge roundness of cemented carbide inserts was investigated in a cooperative work of the Scientific Technical Committee (STC) “Cutting” of the International Academy for Production Engineering (CIRP). Machining with diverse laser beam pulsing duration and feed velocity as well as micro blasting were employed prior to the coating deposition for shaping the cutting tool’s edges. The wear behaviour of the coated inserts was tested in milling TiAl6V4 and Inconel 718. Considering the inserts’ surface micro-structure and mechanical properties developed after the laser treatment, the coated tools’ cutting performance deterioration or improvement compared to untreated substrates was explained.

      PubDate: 2017-03-09T21:25:11Z
      DOI: 10.1016/j.cirpj.2017.02.003
       
  • Increasing efficiency of Ti-alloy machining by cryogenic cooling and using
           ethanol in MRF
    • Authors: G. Krishnamurthy; S. Bhowmick; W. Altenhof; A.T. Alpas
      Abstract: Publication date: Available online 6 March 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): G. Krishnamurthy, S. Bhowmick, W. Altenhof, A.T. Alpas
      Generation of high and localized cutting zone temperatures leading to dissolution wear hinders machining of titanium (Ti) alloys using uncoated carbide tools. In addition, the thermo-plastic instability exhibited by Ti alloys promotes serrated chip formation that causes fluctuations in the cutting forces leading to chatter and severe flank wear. This work considers two methods to mitigate the problems that occur during cutting of Ti-6Al-4V, namely, cryogenic machining and the use of ethanol blended metal removal fluids (MRF). Cryogenic machining decreased the cutting force and surface roughness compared to dry machining under the ambient conditions. The decrease in the fracture energy of Ti-6Al-4V (as measured by Charpy impact tests) and brittle type fracture led to formation of shorter chip segments during cryogenic machining. Alternatively the use of ethanol blended MRF further reduced the cutting force by over 65% compared to dry machining. Ethanol blended MRF facilitated adsorption of OH groups from ethanol by the carbon at the surfaces of the cutting tool resulting in negligible adhesion to the cutting tool.

      PubDate: 2017-03-09T21:25:11Z
      DOI: 10.1016/j.cirpj.2017.01.001
       
  • The impact of contact zone flow rate and bulk cooling on the cooling
           efficiency in grinding applying different nozzle designs and grinding
           wheel textures
    • Authors: Kirsch
      Abstract: Publication date: Available online 6 March 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): B. Kirsch
      In this paper, investigations on different fluid supply methods in grinding are presented. Different nozzle designs as well as different grinding wheel types were investigated. Besides a standard superabrasive grinding wheel with continuous layer, a slotted grinding wheel was investigated. This wheel provides small pockets positioned around its perimeter. Through these pockets, the amount of fluid transported into the contact zone was increased. The different setups enabled to identify the influences of contact zone flow rate and bulk cooling on the cooling efficiency in grinding. The cooling efficiency was evaluated by means of the resulting alteration of surface integrity. The results show that a sufficiently high contact zone flow rate prevails over a high bulk cooling of the workpiece.

      PubDate: 2017-03-09T21:25:11Z
       
  • Holistic criteria-based optimization of filament wound high pressure
           vessels
    • Authors: Lars Ulke-Winter; Lothar Kroll
      Abstract: Publication date: Available online 10 February 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Lars Ulke-Winter, Lothar Kroll
      For dimensioning of wound fiber reinforced high pressure vessels the design engineer has to consider various requirements. Since in addition to the strength requirements, in particular the manufacturing constraints must be taken into account. In order to support the design engineer in the complex dimensioning process of such high-pressure vessels a holistic design strategy was developed on the basis of an ant colony optimization algorithm. The aim was to do this winding-optimization without costly dedicated software and instead develop basic design criteria. For this it was necessary in both carry out a holistic comparative quality evaluation of different solutions as well as providing a customizable objective function.

      PubDate: 2017-02-11T20:21:37Z
      DOI: 10.1016/j.cirpj.2017.01.002
       
  • Assignment of weightage to machining characteristics to improve overall
           performance of machining using GTMA and utility concept
    • Authors: K. Venkata Rao; P.B.G.S.N. Murthy; K.P. Vidhu
      Abstract: Publication date: Available online 21 January 2017
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): K. Venkata Rao, P.B.G.S.N. Murthy, K.P. Vidhu
      In an automated manufacturing system, performance of machining is an important characteristic that affects the production cost especially in machining processes like milling and boring. Boring is one of critical machining processes, and therefore, it is very difficult to determine overall performance of the process. In the present work, an attempt was made to maximize overall performance of the process in order to reduce reworking and production cost. Three different performance characteristics like surface roughness, tool wear and root mean square of workpiece vibration velocity are considered to determine overall performance for boring of AISI 1040 steel with carbide tool inserts. According to User's Preference Rating, weights for the three performance characteristics are calculated using graph theory and matrix approach (GTMA). Overall performance or utility value of the machining process is calculated using utility concept. A response surface methodology (RSM) is used to optimize the process parameters for maximization of performance of the process. Weights of surface roughness, tool wear and root mean square of workpiece vibration velocity are calculated as 0.489, 0.367 and 0.184 respectively. Optimum process parameters were found to be 0.4mm of nose radius, 170m/min of cutting speed and 0.1358mm/rev of feed rate.

      PubDate: 2017-01-22T19:34:40Z
      DOI: 10.1016/j.cirpj.2016.12.001
       
  • 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
       
  • Through-life engineering services of wind turbines
    • Authors: Joel Igba; Kazem Alemzadeh; Christopher Durugbo; Egill Thor Eiriksson
      Abstract: Publication date: Available online 7 October 2016
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Joel Igba, Kazem Alemzadeh, Christopher Durugbo, Egill Thor Eiriksson
      The past decade has seen exponential yearly growth in installed capacity wind energy power generation. As a result, wind farm (WF) projects have evolved from small scale isolated installations into complex utility scale power generation systems comprising of arrays of large wind turbines (WTs), which are designed to operate in harsh environments. However, this has increased the need for through-life engineering service (TES) for WTs especially in offshore applications, where the operations and maintenance (O&M) becomes more complicated as a result of the harsh marine weather and environmental conditions. In this paper, a generic methodology to benchmark TES in industries is presented and used to assess TES in the wind industry. This was done by identifying the current state-of-the-art in methods and applications, requirements and needs, challenges, and opportunities of TES in the wind sector. Furthermore an illustrative case study on WT gearbox through-life support is presented demonstrating how some of the core aspects, such as remote condition monitoring, can be used to aid the in-service support of wind turbine gearboxes.

      PubDate: 2016-10-10T00:11:33Z
      DOI: 10.1016/j.cirpj.2016.08.003
       
  • Feed-forward observer-based intermittent fault detection
    • Authors: T. Sedighi; P.D. Foote; P. Sydor
      Abstract: Publication date: Available online 17 September 2016
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): T. Sedighi, P.D. Foote, P. Sydor
      This paper provided an approach to design feed-forward observer for nonlinear systems with Lipchitz nonlinearity and bounded unknown inputs (disturbances/uncertainties) to ensure the sensitivity against intermittent faults. The proposed observer design guarantees the system error stability. Some variables and scalars are also introduced to design observer's parameters, which bring more degrees of flexibility available to the designer. The designed observer is used to propose a precision fault detection scheme including adaptive threshold design to detect intermittent faults. The efficiency of the considered approach is examined by the intermittent failure case in the suspension system of a vehicle. Simulation results show that the accurate state estimation and fault detection are achieved successfully.

      PubDate: 2016-09-21T12:30:07Z
      DOI: 10.1016/j.cirpj.2016.08.004
       
  • Multiscale measurement of air foils with data fusion of three optical
           inspection systems
    • Authors: Jochen Schlobohm; Yinan Li; Andreas Pösch; Markus Kästner; Eduard Reithmeier
      Abstract: Publication date: Available online 14 September 2016
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Jochen Schlobohm, Yinan Li, Andreas Pösch, Markus Kästner, Eduard Reithmeier
      Measuring the geometry of machine parts with complex geometries creates new challenges towards measurement systems. Due to cost, fast inspection is nevertheless desirable. Additionally the characterization of a parts health and functionality requires geometric information in different scales. We have developed a set of optical measurement systems which together meet those requirements: A borescopic fringe projection system, a macroscopic fringe projection system using newly developed algorithms for fast inspection of turbine blades and a low coherence Michelson interferometer (LCI). The first can detect geometric variances in hard to reach areas, e.g. inside machines or in between parts with highly complex geometries like blade integrated discs (blisks). Using fully adaptable fringe patters, the second system can locate geometric variances with a single fringe pattern. These patterns lead to high sensitivity and high measurement speed. Afterwards the LCI further inspects the micro structure of defects and characterizes the surface structure of the air foil. The presented algorithms provide fast 3D reconstruction with a nanometer resolution and, compared to other systems, a large measurement range. Together, these three inspection systems are capable to detect and quantify defects or geometric variances of industrial parts in different scales. This information improves the prediction of the reliability of a part and helps extending its lifetime to reduce the maintenance costs of machines. As an example a turbine blade was measured with all three systems and the results are visualized in one dataset. Means to merge the measurements are discussed.
      Graphical abstract image Highlights

      PubDate: 2016-09-21T12:30:07Z
      DOI: 10.1016/j.cirpj.2016.07.006
       
  • Outlining an overall Functional Product lifecycle – Combining and
           coordinating its economic and technical perspectives
    • Authors: John Lindström; Magnus Karlberg
      Abstract: Publication date: Available online 9 September 2016
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): John Lindström, Magnus Karlberg
      Currently, industry is showing increasing interest in performance-based business models. Functional Products is one such business model, where the provider offers a function to customers at an agreed-upon level of availability, productivity or efficiency, etc. A Functional Product comprises the following four main constituents: hardware, software, service support system and management of operation, which together deliver value to customers on a long-term basis. This paper, based on empirical data, provides an outline and starts the verification of a proposed overall Functional Product lifecycle combining and coordinating its economic- and technical perspectives. The perspectives are combined and the key aspects of the necessary coordination between and within the perspectives, i.e., sustainable win-win situations and coordination of sub-lifecycles for the economic perspective, and the need for coordination between the Functional Products’ technical perspective's four sub-lifecycles (hardware, software, service-support system and management of operation), are elaborated and discussed. Further, addition of new functionality, contract management, and long-term management of operation are discussed in the light of managing fleets/individual customers, assets and availability. The proposed overall Functional Product lifecycle is further analyzed from a number of views and aspects.

      PubDate: 2016-09-13T07:35:32Z
      DOI: 10.1016/j.cirpj.2016.08.005
       
  • Technology lifecycle-oriented search for production technologies
    • Authors: Josef Greitemann; Michael A. Zaggl; Martin Hehl; Christina Raasch; Gunther Reinhart
      Abstract: Publication date: Available online 7 September 2016
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Josef Greitemann, Michael A. Zaggl, Martin Hehl, Christina Raasch, Gunther Reinhart
      The adoption of production technologies is a major challenge for manufacturing companies. Despite the long term impact of decisions on production technologies, companies are often unaware how to search for alternative production technologies. We developed a method that focusses on the systematic search for production technologies for fulfilling future manufacturing tasks. The method consists of three steps including the selection of information sources, information search and information evaluation. It takes advantages of the concept of technology lifecycles. The method provides a useful tool for producing companies and has been applied exemplary in the automotive industry.

      PubDate: 2016-09-08T06:54:30Z
      DOI: 10.1016/j.cirpj.2016.08.001
       
  • Flow visualization and simulation of the filling process during injection
           molding
    • Authors: Patrick Guerrier; Guido Tosello; Jesper Henri Hattel
      Abstract: Publication date: Available online 20 August 2016
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Patrick Guerrier, Guido Tosello, Jesper Henri Hattel
      To directly compare experimental moldings from an injection molding machine with simulations, a special mold has been produced with a glass window. The injection plane is perpendicular to the opening and closing planes, in order for the 55mm thick glass window to be easily visible from the side. A high speed camera recording 500 frames per second was employed, and the mold had three thermocouples and two pressure sensors installed. The molded part is a 2mm thick plate with a 0.5mm thin section, which creates a characteristic V-shaped flow pattern. Two different materials were employed, namely ABS and a high viscosity PC. Simulations were performed using the actual machine data as input, including the injection screw acceleration. Furthermore, the nozzle and barrel geometries were included as a hot runner to capture the effect of compressibility of the material in front of the screw. These two had significant effects on the filling times and injection pressure calculated by the simulations. Other effects investigated included transient thermal management of the mold, pressure dependent viscosity and wall slip, but their effect were not remarkably large in this work. The obtained simulation results showed deviations within 10–30ms (relative deviation in the order of 5–10%) for the ABS and slightly more for the high viscosity PC in the range of 100–500ms (relative deviation in the order of 20–30%) on timings between different sections during filling.

      PubDate: 2016-08-24T03:04:19Z
      DOI: 10.1016/j.cirpj.2016.08.002
       
  • Evaluation of the Lifetime Impact Identification Analysis: Two tests in a
           changeable context
    • Authors: R.J. (Richard) Ruitenburg; A.J.J. (Jan) Braaksma
      Abstract: Publication date: Available online 20 August 2016
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): R.J. (Richard) Ruitenburg, A.J.J. (Jan) Braaksma
      Asset Life Cycle Management aims to maximize the value realized from physical assets over their complete lifetime. Over the years, the operation and maintenance of the assets must continually be adapted to changes in goals and context. In an earlier publication, we proposed the Lifetime Impact Identification Analysis to identify such changes. This paper tests this method through an application at two different companies. The method proved to result in a shared and integral overview of long-term challenges and opportunities for the asset, based on experts discussing the asset's future from a technical, economic, compliance, commercial and organizational perspective.

      PubDate: 2016-08-24T03:04:19Z
      DOI: 10.1016/j.cirpj.2016.05.009
       
  • Characterisation and full-scale production testing of multifunctional
           surfaces for deep drawing applications
    • Authors: A. Godi; J. Grønbæk; L. De Chiffre
      Abstract: Publication date: Available online 11 August 2016
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): A. Godi, J. Grønbæk, L. De Chiffre
      Full-scale deep drawing tests using tools featuring multifunctional surfaces are carried out in a production environment. Multifunctional tools display regularly spaced, transversal grooves for lubricant retention obtained by hard-turning, separated by smooth bearing plateaus realized by robot assisted polishing. Advanced methods are employed to characterise the tools’ surface topographies, detecting the surface features and analysing them separately according to their specific function. Four different multifunctional dies as well as two un-textured references are selected for testing. The tests are run using a non-hazardous, environmentally friendly lubricant, and the forming forces are constantly recorded. Multifunctional dies exhibit very good performances, with no galling occurrence and punch forces generally lower than the two references.

      PubDate: 2016-08-13T22:55:10Z
      DOI: 10.1016/j.cirpj.2016.07.001
       
  • Tool wear and surface quality assessment of CFRP trimming using fractal
           analyses of the cutting force signals
    • Authors: X. Rimpault; J.-F. Chatelain; J.E. Klemberg-Sapieha; M. Balazinski
      Abstract: Publication date: Available online 3 August 2016
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): X. Rimpault, J.-F. Chatelain, J.E. Klemberg-Sapieha, M. Balazinski
      The surface quality of machined carbon fibre reinforced plastics (CFRP) differs depending on cutting conditions, e.g. cutting parameters and tool wear. Fractal analyses were performed on the cutting force signals, acquired during the trimming of CFRP, to describe the signal complexities variations. Fractal parameters, such as dimension and topothesy, were used to describe the signal irregularity and complexity. Statistical parameters, e.g. average and amplitude, and fractal parameters were compared related to the tool wear and to the surface quality. The fractal results from cutting force signals can estimate the tool wear and the surface quality.

      PubDate: 2016-08-13T22:55:10Z
      DOI: 10.1016/j.cirpj.2016.06.003
       
  • An experimental investigation on the machining characteristics of Nimonic
           75 using uncoated and TiAlN coated tungsten carbide micro-end mills
    • Authors: Niharika Swain; Vijay Venkatesh; Praveen Kumar; G. Srinivas; S. Ravishankar; Harish C. Barshilia
      Abstract: Publication date: Available online 2 August 2016
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Niharika Swain, Vijay Venkatesh, Praveen Kumar, G. Srinivas, S. Ravishankar, Harish C. Barshilia
      We report the machining characteristics and machinability of a nickel based superalloy in this study. A micro-milling operation is loaded on Nimonic 75 using uncoated and TiAlN coated tungsten carbide micro-end mills. A full factorial design of experiments was devised to optimize the machining conditions to reduce the flank wear on the tool surface. The optimized machining conditions for uncoated micro-tools were found to be a cutting speed (v c) of 13m/min and a feed rate (f z) of 6mm/min. Following this, the tools were coated with TiAlN using a semi-industrial four-cathode reactive pulsed direct current unbalanced magnetron sputtering system. Further experiments were then performed using these optimized machining conditions using both uncoated and TiAlN coated micro-tools in order to ascertain the tool wear and surface integrity. The change in geometry of the machined slot was estimated based on the variation in tool radius of the micro-end mill with progression of the operation. A direct comparison was made between the results observed using both uncoated and TiAlN coated tungsten carbide to illustrate the effect of the nanocomposite TiAlN coating. It was seen that TiAlN coated micro-tools exhibited a superior performance as compared to the uncoated ones with respect to tool life and micro-burr formation.

      PubDate: 2016-08-13T22:55:10Z
      DOI: 10.1016/j.cirpj.2016.07.005
       
  • Mechanistic cutting force modelling for micro-drilling of CFRP composite
           laminates
    • Authors: Ravi Shankar Anand; Karali Patra
      Abstract: Publication date: Available online 1 August 2016
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Ravi Shankar Anand, Karali Patra
      This article presents a mechanistic model to predict thrust force and torque in micro-drilling of carbon fibre-reinforced plastic (CFRP) composite laminates. Tool edge radius effects are considered in this model to predict cutting forces even at low feed values which are comparable to the tool edge radius. As greater fluctuation of cutting force is very common in micro scale machining of composite material due to its layered structure, fabric plies and epoxy resin matrix layers are considered in this model as separate phases rather than as equivalent homogeneous material. Separate sets of cutting coefficients for each phase are determined from the experimental results. The fluctuations of average thrust and torque in alternate layers of fabric plies and epoxy resin matrix are predicted and validated with new experimental results of micro-drilling with a 0.5mm diameter tungsten carbide tool. In both layers, the model predictions are close to the experimental results. Though the prediction errors in epoxy resin matrix are comparatively higher than the errors in fabric plies, these are reasonable considering the complex sub surface damage mechanism due to epoxy resin matrix failure and interfacial debonding.

      PubDate: 2016-08-13T22:55:10Z
      DOI: 10.1016/j.cirpj.2016.07.002
       
  • Formability in single point incremental forming: A comparative analysis of
           the state of the art
    • Authors: Tegan McAnulty; Jack Jeswiet; Matthew Doolan
      Abstract: Publication date: Available online 25 July 2016
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): Tegan McAnulty, Jack Jeswiet, Matthew Doolan
      Single point incremental forming (SPIF) has higher formability limits than other sheet metal forming processes including stamping, and is therefore a desirable method of forming sheet metal components. To take advantage of this high formability it is necessary to understand how to maximise the limits through manipulation of parameters, increasing the likelihood of component success. In this paper, a systematic quantitative literature review was undertaken analysing experiments and results from 35 papers that studied the effect of process parameters on formability in SPIF. Collective results are presented regarding material thickness, tool diameter, tool shape and type, step down, feed rate, spindle speed and rotation direction, and some parameter interactions. The analysis provides evidence to support the hypothesis of an ideal operating range for each parameter and interdependency of parameters. A lack of focus in the literature on parameter interactions was found. A framework for important experimental parameters is proposed based on the review. Statement of originality Quantitative analysis of research presented in the literature about parameter effects on formability in SPIF.

      PubDate: 2016-08-13T22:55:10Z
      DOI: 10.1016/j.cirpj.2016.07.003
       
  • Development and evaluation of a knowledge-based decision-making approach
           for designing changeable manufacturing systems
    • Authors: E. Francalanza; J. Borg; C. Constantinescu
      Abstract: Publication date: Available online 13 July 2016
      Source:CIRP Journal of Manufacturing Science and Technology
      Author(s): E. Francalanza, J. Borg, C. Constantinescu
      Due to highly competitive markets, constantly shifting consumer requirements, and technological advances, product families are continuously evolving over time. This product evolution leads to new part variants being added to the existing part mix. When at a future time the manufacturing system is not capable, as is or in a reconFigured state, to manufacture the evolved part variants, then this has negative consequences on business performance. This phenomena is being termed as disruptive product evolution. Due to complex interdependencies, incomplete information and uncertainty in manufacturing requirements this phenomena leads to a wicked problem. In order to tame such a wicked problem, this paper contributes and evaluates a knowledge-based decision-making approach that supports manufacturing system designers in exploring the interplay between business strategy, evolving product range and manufacturing systems. A prototype digital factory tool based on this approach has been developed and evaluated. The encouraging results obtained have shown that this research paves the way for the development and integration of such knowledge-based decision-making approaches within state of the art digital factory tools.

      PubDate: 2016-08-13T22:55:10Z
      DOI: 10.1016/j.cirpj.2016.06.001
       
 
 
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