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  Subjects -> ENGINEERING (Total: 2417 journals)
    - CHEMICAL ENGINEERING (207 journals)
    - CIVIL ENGINEERING (202 journals)
    - ELECTRICAL ENGINEERING (111 journals)
    - ENGINEERING (1267 journals)
    - ENGINEERING MECHANICS AND MATERIALS (400 journals)
    - HYDRAULIC ENGINEERING (56 journals)
    - INDUSTRIAL ENGINEERING (76 journals)
    - MECHANICAL ENGINEERING (98 journals)

ENGINEERING (1267 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 8)
3D Research     Hybrid Journal   (Followers: 21)
AAPG Bulletin     Hybrid Journal   (Followers: 8)
AASRI Procedia     Open Access   (Followers: 14)
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: 273)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 3)
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: 7)
Advanced Journal of Graduate Research     Open Access  
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 5)
Advanced Science Letters     Full-text available via subscription   (Followers: 10)
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: 5)
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: 17)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 13)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 21)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 29)
Advances in Operations Research     Open Access   (Followers: 12)
Advances in OptoElectronics     Open Access   (Followers: 6)
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Polymer Science     Hybrid Journal   (Followers: 43)
Advances in Porous Media     Full-text available via subscription   (Followers: 5)
Advances in Remote Sensing     Open Access   (Followers: 44)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 3)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 6)
AIChE Journal     Hybrid Journal   (Followers: 35)
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: 26)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 10)
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: 24)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 4)
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)
Antarctic Science     Hybrid Journal   (Followers: 1)
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: 6)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 11)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Network Science     Open Access   (Followers: 3)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 5)
Applied Sciences     Open Access   (Followers: 3)
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: 5)
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: 28)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 1)
BER : Motor Trade Survey     Full-text available via subscription  
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 1)
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)
Beyond : Undergraduate Research Journal     Open Access  
Bhakti Persada : Jurnal Aplikasi IPTEKS     Open Access  
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Bilge International Journal of Science and Technology Research     Open Access  
Biofuels Engineering     Open Access   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 11)
Biomedical Engineering     Hybrid Journal   (Followers: 15)
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: 21)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 37)
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   (Followers: 1)
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Bitlis Eren University Journal of Science and Technology     Open Access  
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: 12)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 13)
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   (Followers: 2)
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 31)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 42)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 6)
Case Studies in Thermal Engineering     Open Access   (Followers: 5)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
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  
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: 3)
CienciaUAT     Open Access   (Followers: 1)
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: 13)
City, Culture and Society     Hybrid Journal   (Followers: 21)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Clean Air Journal     Full-text available via subscription   (Followers: 1)
Clinical Science     Full-text available via subscription   (Followers: 9)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 6)
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: 14)
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: 28)
Composite Interfaces     Hybrid Journal   (Followers: 7)
Composite Structures     Hybrid Journal   (Followers: 277)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 208)
Composites Part B : Engineering     Hybrid Journal   (Followers: 249)
Composites Science and Technology     Hybrid Journal   (Followers: 193)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access   (Followers: 1)
Computational Geosciences     Hybrid Journal   (Followers: 16)
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: 31)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 8)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 5)
Computers and Geotechnics     Hybrid Journal   (Followers: 11)
Computing and Visualization in Science     Hybrid Journal   (Followers: 7)
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)

        1 2 3 4 5 6 7 | Last

Journal Cover
CIRP Annals - Manufacturing Technology
Journal Prestige (SJR): 2.034
Citation Impact (citeScore): 4
Number of Followers: 11  
 
  Full-text available via subscription Subscription journal
ISSN (Print) 0007-8506
Published by Elsevier Homepage  [3163 journals]
  • Real-time teaming of multiple reconfigurable manufacturing systems
    • Abstract: Publication date: Available online 19 June 2018
      Source:CIRP Annals
      Author(s): Xingyu Li, Alparslan Emrah Bayrak, Bogdan I. Epureanu, Yoram Koren
      Personalized production poses new challenges on reconfigurable manufacturing systems due to a dramatic increase in the variety and stochasticity of the manufacturing demand. This paper proposes a connected autonomous reconfigurable manufacturing system with a decentralized management of individual autonomous lines that can be reconfigured for diverse manufacturing tasks via manufacturing modules. We present a mathematical approach for distributing the stochastic demands and exchanging machines or modules among lines (which are groups of machines) as a bidding process, and for adaptively configuring these lines and machines for the resulting shared demand under a limited inventory of configurable components.

      PubDate: 2018-06-20T10:13:58Z
       
  • Adaptive preloading for rack-and-pinion drive systems
    • Abstract: Publication date: Available online 19 June 2018
      Source:CIRP Annals
      Author(s): A. Verl, T. Engelberth
      In the field of machine tools, rack-and-pinion drive systems are one of the commonly used feed drive systems. In order to achieve the high accuracy specifications of modern production facilities, these drives are electrically preloaded to reduce backlash in the drive train. In most cases, the preload is fixed, even though the method of electrical preloading allows adjustment during operation. This paper describes a novel approach – called adaptive preloading – to adjust preload during operation. The objective is to increase the drive system’s energy efficiency by continuously adapting the preload, which is minimally required for maintaining the drive system’s accuracy.

      PubDate: 2018-06-20T10:13:58Z
       
  • Multi-station molding machine for attaining high productivity in small-lot
           productions
    • Abstract: Publication date: Available online 18 June 2018
      Source:CIRP Annals
      Author(s): Chikage Kato, Naoki Hiraiwa, Tsuyoshi Arai, Jun Yanagimoto
      In typical resin molding, multi-cavity molds are generally used to reduce cycle time and increase productivity. However, these types of molds are large, which also increase the size of the facility. The newly developed compact multi-station resin molding machine features single-cavity molds and split process which are conducted in parallel in four stations to cut down on cycle time. To realize this method, small molds with self-clamping is required. This paper reports the results of the method for obtaining the optimum conditions for suppressing the generation of flashes and the degradation of dimensional accuracy in a short time using CAE.

      PubDate: 2018-06-20T10:13:58Z
       
  • Flexibility in metal forming
    • Abstract: Publication date: Available online 18 June 2018
      Source:CIRP Annals
      Author(s): D.Y. Yang, M. Bambach, J. Cao, J.R. Duflou, P. Groche, T. Kuboki, A. Sterzing, A.E. Tekkaya, C.W. Lee
      Flexibility in metal forming is needed more than ever before due to rapidly changing customer demands. It paves the way for a better control of uncertainties in development and application of metal forming processes. Although flexibility has been pursued from various viewpoints in terms of machines, material, process, working environment and properties, etc., a thorough study of the concept was undertaken in order to with problems of manufacturing competiveness and tackle new challenges of manufacturing surroundings. Therefore, in this paper, flexibility in forming is reviewed from the viewpoints of process, material, manufacturing environment, new process combinations and machine–system–software interactions.

      PubDate: 2018-06-20T10:13:58Z
       
  • Interdisciplinary multi-criteria optimization using hybrid simulation to
           pursue energy efficiency through production planning
    • Abstract: Publication date: Available online 8 June 2018
      Source:CIRP Annals
      Author(s): Wilfried Sihn, Thomas Sobottka, Bernhard Heinzl, Felix Kamhuber
      An energy-efficient production is imperative and can reduce costs. Despite the acknowledged potential to increase energy efficiency in production systems through production planning and control (PPC), adequate planning methods are lacking. This article presents an interdisciplinary approach for a simulation-based multi-criteria optimization, integrating energy efficiency into PPC objectives. The method considers production equipment together with HVAC and technical building services. It features a novel integrated hybrid discrete/continuous simulation method enabling to accurately capture dynamic interactions between material and energy flows. The approach is evaluated in a case study on the food industry, indicating potential energy efficiency gains of up to 30%.

      PubDate: 2018-06-11T10:03:38Z
       
  • Ultimate capability of variable pitch milling cutters
    • Abstract: Publication date: Available online 7 June 2018
      Source:CIRP Annals
      Author(s): Gabor Stepan, David Hajdu, Alex Iglesias, Denes Takacs, Zoltan Dombovari
      Variable pitch milling cutters intend to increase performance, but off-the-shelf cutters do not ensure this generally. Depending on the milling process they are selected for, they can perform better or even worse than uniform pitch cutters do. Improved performance can be guaranteed by considering the reflected dynamic behaviour of the machine/tool/workpiece system. This work presents the achievable upper and lower capability bounds by introducing so-called stabilizability diagrams of a hypothetical variable pitch milling cutter that is tuned continuously along the stability boundaries. Robustly tuned milling cutters are designed for selected spindle speed ranges, which are experimentally tested both under laboratory and industrial conditions.

      PubDate: 2018-06-08T09:59:01Z
       
  • Virtual compensation of deflection errors in ball end milling of flexible
           blades
    • Abstract: Publication date: Available online 6 June 2018
      Source:CIRP Annals
      Author(s): Y. Altintas, O. Tuysuz, M. Habibi, Z.L. Li
      The deflections of highly flexible turbine blades and slender end mills lead to tolerance violations during milling. This paper presents a digital simulation and compensation model for blade machining operations. Stiffness of the blade at the cutting zone is updated as the metal is removed without re-meshing using a computationally efficient sub-structuring technique. The cutter–workpiece engagement is evaluated by considering the deformations of both end mill and the blade under the cutting loads. The estimated deformations are compensated by modifying the tool path coordinates. The model has been experimentally verified in ball-end milling of a blade whose dimensional errors have been reduced from ∼70μm to ∼10μm.

      PubDate: 2018-06-08T09:59:01Z
       
  • Learnstruments: Learning-conducive artefacts to foster learning
           productivity in production engineering
    • Abstract: Publication date: Available online 5 June 2018
      Source:CIRP Annals
      Author(s): Jan Philipp Menn, Bernd Muschard, Bastian Schumacher, Felix Sieckmann, Holger Kohl, Günther Seliger
      Learnstruments are artefacts, which automatically demonstrate their functionality to the learner. They can be used directly at the workplace and aim at increasing the learning and teaching productivity. The huge variety of design paths for Learnstruments requires a systematic approach for their development. A morphology for Learnstruments is introduced. Exemplary learning-conducive applications for manual assembly in international organizations like 3D-PDFs and a Smart-Assembly-Workplace are presented. They help avoiding assembly errors and improve productivity by providing interactive instructions to the learners. By implementing these along the morphology guideline, the consideration of important didactical and technical criteria is ensured.

      PubDate: 2018-06-05T09:47:53Z
       
  • Modeling study of the hydrodynamic arc breaking mechanism in BEAM
    • Abstract: Publication date: Available online 1 June 2018
      Source:CIRP Annals
      Author(s): Wansheng Zhao, Lin Gu, Fawang Zhang, K.P. Rajurkar
      Blasting erosion arc machining (BEAM) utilizes thermal effect of the arc rather than spark to remove workpiece material. This paper investigates the expansion and distortion rules of the discharge channel based on the analysis of high speed photography and the micrographs of craters to study mechanism of BEAM. Based on these investigations, a thermal finite element model is developed. Then the temperature distributions in workpieces, both with and without flushing, are obtained. The comparisons of the obtained temperature distributions explain the formation of the trailing crater and the effect of hydrodynamic arc breaking mechanism on the efficiency of BEAM.

      PubDate: 2018-06-05T09:47:53Z
       
  • Modelling and compensation of dominant thermally induced geometric errors
           using rotary axes’ power consumption
    • Abstract: Publication date: Available online 30 May 2018
      Source:CIRP Annals
      Author(s): Elie Bitar-Nehme, J.R.R. Mayer
      Thermally induced volumetric errors due to rotary axes’ activity are measured on a five-axis machine tool using a non-contact R-test device with a four-ball uncalibrated artefact and an Invar reference length. The gathered volumetric data allow to estimate intra- and inter-axis machine errors as well as the table expansion via the estimated balls position. Dominant thermal effects are modelled as functions of the measured rotary axes drive power consumption by the superposition of single-input single-output first order transfer functions. The efficiency of the model is validated with different motion sequences and by the compensated machining of a test piece.

      PubDate: 2018-06-02T09:33:17Z
       
  • Anomalous influence of polarity in sink EDM of titanium alloys
    • Abstract: Publication date: Available online 30 May 2018
      Source:CIRP Annals
      Author(s): Maximilian Holsten, Philip Koshy, Andreas Klink, Alexander Schwedt
      An anodic tool polarity is generally adopted in sink electrical discharge machining (EDM) to maximize material removal relative to tool wear. Sink EDM of Ti and Ti6Al4V is however atypical in that these materials necessitate a cathodic tool polarity. Adding to the intrigue is γ-TiAl, which machines better under the conventional anodic polarity. This research focused on clarifying the phenomena behind this interesting behavior by investigating removal mechanisms over a range of relevant process conditions. The anomaly is demonstrated to arise from the polarity-dependent nature and extent of TiC formation on the work surface, which significantly affects material removal.

      PubDate: 2018-06-02T09:33:17Z
       
  • Experimental investigation of the process behaviour in
           Mechano-Electrochemical Milling
    • Abstract: Publication date: Available online 30 May 2018
      Source:CIRP Annals
      Author(s): Dries Van Camp, Jun Qian, Jef Vleugels, Bert Lauwers
      The increasing demand for high-performance materials, in for example aerospace and biomedical industries, calls for more efficient and capable technologies. This paper describes a new technology, namely Mechano-Electrochemical Milling (MECM), which combines electrochemical machining (ECM) with a mechanical cutting process. The process behaviour has been investigated experimentally based on the machining of two Titanium alloys, Titanium grade 2 and Titanium grade 5. The material removal mechanism was investigated through analysis of the machined surface and removed material. Besides the slightly higher material removal rate in MECM compared to ECM, the MECM process results in more stable process conditions.

      PubDate: 2018-05-30T10:05:59Z
       
  • Direct manufacturing of diamond composite coatings onto silicon wafers and
           heat transfer performance
    • Abstract: Publication date: Available online 28 May 2018
      Source:CIRP Annals
      Author(s): R. Lupoi, T. Lupton, R. Jenkins, A.J. Robinson, G.E. O’Donnell
      This paper reveals new insights on how to achieve direct deposition of functional materials onto silicon wafers for cooling purposes. Manufacturing heat spreaders directly onto a microprocessor will negate the need for Thermal Interface Materials (TIMs) which often account for the highest resistances in a typical CPU thermal circuit. In this work we demonstrate that Cold Spray can be tailored to directly print onto a silicon wafer with a layered structure of aluminum, copper and diamond. The thermal performance of the copper/diamond coating was also separately measured using an in-house testing apparatus showing heat-transfer enhancements in agreement with theoretical predictions.

      PubDate: 2018-05-30T10:05:59Z
       
  • Mixed-initiative assembly planning combining geometric reasoning and
           constrained optimization
    • Abstract: Publication date: Available online 25 May 2018
      Source:CIRP Annals
      Author(s): Csaba Kardos, József Váncza
      The paper presents a generic workflow of semi-automated and optimized process planning in mechanical assembly. It supports the production engineer throughout the entire planning process, departing from part analysis via task sequencing up to the generation of detailed work instructions. Main stages such as part analysis, macro planning and various aspects of micro planning are presented along with a feedback mechanism which warrants executability of plans using the available technological and human resources. Emphasis is set on the essential role of geometric reasoning and its combined use with constrained optimization. The workflow is demonstrated on industrial case studies.

      PubDate: 2018-05-28T10:02:34Z
       
  • Novel drill bit with characteristic web shape for high efficiency and
           accuracy
    • Abstract: Publication date: Available online 25 May 2018
      Source:CIRP Annals
      Author(s): Naohiko Sugita, Masaya Oshima, Katsuyo Kimura, Giichi Arai, Koichi Arai
      This study proposes a novel drill design to reduce the cutting force and improve finished material surfaces. Drilling is a common procedure in manufacturing, and there is an increased demand to shorten the tact time by reducing the cutting force, and by prolonging the tool’s life. In this study, a new web shape was proposed based on the proposition to implement an additional cutting edge, complemented by experimental work. The results indicated that the cutting force decreased by more than 20%, and the circularity of the drilled holes was also improved.

      PubDate: 2018-05-28T10:02:34Z
       
  • Redundancy-enabled stabilisation of linear encoder performance: The
           biSLIDER
    • Abstract: Publication date: Available online 24 May 2018
      Source:CIRP Annals
      Author(s): Alessandro Balsamo, Claudio Francese, Renato Ottone, Aline Piccato
      Linear encoders are widely used in industry particularly for machine tools. Their performance may suffer thermal and mechanical instability. This paper presents a technique to stabilise the performance over time by recovering to a reference state. It is based on the simultaneous readings of two heads separated by an invariant spacer. It requires off-the-shelf components only and is widely applicable in industry. Experimental results in the field and in lab show excellent error recovery even in the presence of highly nonlinear errors.

      PubDate: 2018-05-28T10:02:34Z
       
  • Feeling machines for online detection and compensation of tool deflection
           in milling
    • Abstract: Publication date: Available online 24 May 2018
      Source:CIRP Annals
      Author(s): Berend Denkena, Haythem Boujnah
      In milling, the tool deflection negatively affects the accuracy of the workpiece geometry. Feeling machines with force sensing capabilities represent a promising enabler to detect and to compensate the deflection-related machining failures in real time. This paper gives an overview about current applications of feeling machine tools and developments of monitoring and compensation systems for tool deflection. At first, a method to integrate strain sensors within rigid machine tool structures is introduced. Secondly, the prototypical application within commercial milling centres is presented. Finally, two compensation strategies for tool deflection via feed- and position-based control are discussed and experimentally evaluated.

      PubDate: 2018-05-28T10:02:34Z
       
  • A location-allocation model for sustainable NdFeB magnet recovery under
           uncertainties
    • Abstract: Publication date: Available online 24 May 2018
      Source:CIRP Annals
      Author(s): Hongyue Jin, Byung Duk Song, Gamini Mendis, Yuehwern Yih, John W. Sutherland
      Neodymium-iron-boron (NdFeB) magnets play a critical role in clean power products, e.g., electric vehicles and wind turbines. Since China has near monopolistic control of the supply of these magnets, many parties are interested in recovering end-of-life magnets for additional use cycles. Such a strategy requires a cost-effective approach to collect and process used magnets while maximizing the economic and environmental benefits. This paper employs fuzzy logic and non-dominated sorting genetic algorithm (NSGA-II) to solve a location-allocation problem for NdFeB magnet recovery under supply and demand uncertainties. A Pareto front is constructed to evaluate the performance of the proposed design.

      PubDate: 2018-05-28T10:02:34Z
       
  • Resilient architecture for cyber-physical production systems
    • Abstract: Publication date: Available online 24 May 2018
      Source:CIRP Annals
      Author(s): Tetsuo Tomiyama, Florian Moyen
      Production systems are a typical example of cyber-physical systems (CPS) in which a variety of machines, actuators, sensors and control systems are interwoven to produce products as efficiently as possible. Even though sophisticated condition monitoring systems are deployed, stoppage, breaks, and other types of failures still happen. To avoid catastrophic operational disruptions, desirably the production system itself resiliently and autonomously responses to failures. This paper reports a design method for a resilient architecture of a cyber-physical production system that can deal with disturbances and failures in a discrete-event process. A physical demonstrator was built to demonstrate its reconfiguration capabilities.

      PubDate: 2018-05-28T10:02:34Z
       
  • Digital twin driven prognostics and health management for complex
           equipment
    • Abstract: Publication date: Available online 24 May 2018
      Source:CIRP Annals
      Author(s): Fei Tao, Meng Zhang, Yushan Liu, A.Y.C. Nee
      Prognostics and health management (PHM) is crucial in the lifecycle monitoring of a product, especially for complex equipment working in a harsh environment. In order to improve the accuracy and efficiency of PHM, digital twin (DT), an emerging technology to achieve physical–virtual convergence, is proposed for complex equipment. A general DT for complex equipment is first constructed, then a new method using DT driven PHM is proposed, making effective use of the interaction mechanism and fused data of DT. A case study of a wind turbine is used to illustrate the effectiveness of the proposed method.

      PubDate: 2018-05-28T10:02:34Z
       
  • Basic principles for the design of cutting edge roundings
    • Abstract: Publication date: Available online 24 May 2018
      Source:CIRP Annals
      Author(s): Benjamin Bergmann, Thilo Grove
      Adapted cutting edge roundings lead to a performance increase of cutting tools. The optimal cutting edge design is determined by the thermomechanical process load and thus depends on the machined material. In this study, the external mechanical load is investigated in direct relation to material properties by means of microcinematography. It could be shown that load characteristics are mainly material independent, whereas the load level depends on the machined material. Finally, the findings were transferred into a model, which enables the design of cutting edge roundings based on material properties.

      PubDate: 2018-05-28T10:02:34Z
       
  • Towards joint optimization of product design, process planning and
           production planning in multi-product assembly
    • Abstract: Publication date: Available online 24 May 2018
      Source:CIRP Annals
      Author(s): Daisuke Tsutsumi, Dávid Gyulai, András Kovács, Bence Tipary, Yumiko Ueno, Youichi Nonaka, László Monostori
      Offering product variety is crucial for satisfying diverse customer needs. Although product design, process and production planning related decisions are interdependent, they are conventionally made by different divisions, separately for each product, resulting in excess costs. This paper proposes a methodology for increasing investment efficiency by the joint optimization of product design, process and production planning for a family of products. Tolerance allocation, as a sub-problem of product design, and assembly resource configuration, regarding process planning, are solved jointly, with a foresight on long-term production planning. The efficiency of the method is demonstrated through an industrial case study.

      PubDate: 2018-05-28T10:02:34Z
       
  • Fatigue life of machined Ti6Al4V alloy under different cooling conditions
    • Abstract: Publication date: Available online 24 May 2018
      Source:CIRP Annals
      Author(s): Domenico Umbrello, Giovanna Rotella
      This paper presents an extensive experimental study on the influence of machining parameters and cooling conditions on the overall fatigue life of a titanium component. In particular, dry, minimum quantity lubrication, cryogenic and high-pressure air jet were compared as cooling/lubrication strategies for the finishing operation. The obtained dog-bone cylindrical fatigue specimens were tested under uniaxial pull–pull cyclic loading in the high cycle fatigue range. An analytical model is proposed to predict the high cycle fatigue strength for the material under investigation demonstrating its effectiveness to reduce the number of tests needed.

      PubDate: 2018-05-28T10:02:34Z
       
  • Necking condition of layers in clad sheets during rolling
    • Abstract: Publication date: Available online 24 May 2018
      Source:CIRP Annals
      Author(s): Hiroshi Utsunomiya, Soichiro Maeda, Tetsuyuki Imai, Ryo Matsumoto
      In rolling of clad sheets, layers often show periodical necking in the rolling direction. Mechanism of the plastic instability has not been understood sufficiently so that commercially available combinations of layers are limited. First, effects of rolling conditions on the necking were investigated through finite element analysis of some ideal rolling cases. Meanwhile, multi-pass cold rolling of three type of sandwich sheets was conducted to reveal necking evolutions experimentally. Based on the FE and the experimental results, a plane-strain compression model was proposed to simulate the experiments. The predictions based on change in strain energies show good agreement with the experiment.

      PubDate: 2018-05-28T10:02:34Z
       
  • Proposal of ‘accelerative cutting’ for suppression of
           regenerative chatter
    • Abstract: Publication date: Available online 24 May 2018
      Source:CIRP Annals
      Author(s): Takehiro Hayasaka, Soohyun Nam, Hongjin Jung, Eiji Shamoto, Katsuhisa Saito
      A novel speed variation method, namely ‘accelerative cutting’, is proposed for suppression of regenerative chatter in short-duration plunge cutting, e.g. finishing of sealing, seating, and bearing surfaces. Although the cutting time is short in these processes, the large cutting width often causes chatter. Compared to conventional speed variation methods where moments exist when present and previous cutting speeds do not change and cause the growth of chatter, a unidirectional acceleration is applied resulting in sufficient speed difference throughout the cutting. Since accelerative cutting cannot be realized by conventional NC functions, it is verified through analyses and specially designed cutting experiments.

      PubDate: 2018-05-28T10:02:34Z
       
  • A KBE CAPP framework for qualified additive manufacturing
    • Abstract: Publication date: Available online 24 May 2018
      Source:CIRP Annals
      Author(s): Yicha Zhang, Alain Bernard
      Additive Manufacturing (AM) is going to perform a key role in customized or even small-batch production due to its enlarged design freedom, decreased processing constraints and a non-obvious relationship between the processing cost and complexity. However, the AM production result is not stable because there is a lack of a full processing chain management tool to control the quality. To achieve qualified AM, this paper proposes a knowledge-based process planning (KBE CAPP) framework to solve three main issues: feasibility, suitability and stability in AM production. A developing CAPP prototype system based on this framework is presented for method demonstration.

      PubDate: 2018-05-28T10:02:34Z
       
  • An information and simulation framework for increased quality in welded
           components
    • Abstract: Publication date: Available online 24 May 2018
      Source:CIRP Annals
      Author(s): Rikard Söderberg, Kristina Wärmefjord, Julia Madrid, Samuel Lorin, Anders Forslund, Lars Lindkvist
      The recent trend toward using simulation models with real-time data as digital twins is rapidly increasing in industry. In this paper, a digital framework supporting real-time geometrical quality control of welded components, is presented. The concept is based on a structured process model for all operations included in typical welding, strategies for selective assembly, automatic adjustment of fixtures and optimization of weld sequence. The concept utilizes recently developed algorithms for fast welding simulation and in-line scanning to be used in the optimization loop of an automated welding station—a digital twin for a welding cell.

      PubDate: 2018-05-28T10:02:34Z
       
  • Semi-analytical modelling with numerical and experimental validation of
           electromagnetic forming using a uniform pressure actuator
    • Abstract: Publication date: Available online 19 May 2018
      Source:CIRP Annals
      Author(s): Brad Kinsey, Shunyi Zhang, Yannis P. Korkolis
      In this study, an electromagnetic forming process using a uniform pressure actuator is investigated through electro-magnetic-mechanically coupled numerical simulations; a simplified analytical model to predict the forming pressure and shell theory for mechanical deformation; and experimental results, which include Photon Doppler Velocimetry to measure the deformation. Velocity and the final deformed part shape are compared between the numerical, analytical, and experimental methods and reasonably good agreement is demonstrated. However, accurate comparison is affected by the energy level used with the numerical simulations matching better for the lower energy case due to less material draw-in and the analytical model providing more precise results for the higher energy case.

      PubDate: 2018-05-28T10:02:34Z
       
  • New method for stress determination based on digital image correlation
           data
    • Abstract: Publication date: Available online 18 May 2018
      Source:CIRP Annals
      Author(s): Alexander Brosius, Niklas Küsters, Matthias Lenzen
      Accurate material characterisation of anisotropic yielding behaviour for modern sheet metal requires the testing under multiaxial stress conditions like in the shear test or plane strain test. While most approaches include time-consuming finite element simulations for evaluation of inhomogeneous stress distributions, this paper shows a new method to determine stress data based directly on digital image correlation data. This accurate and efficient semi-analytical method can be used in direct stress analysis or inverse material parameter identification schemes as well. The methodology will be described and exemplarily results of the plane strain test and the shear test will be discussed.

      PubDate: 2018-05-28T10:02:34Z
       
  • Mechanisms and processing limits of surface finish using
           laser-thermochemical polishing
    • Abstract: Publication date: Available online 10 May 2018
      Source:CIRP Annals
      Author(s): Sandro Eckert, Frank Vollertsen
      Laser thermochemical machining allows a controlled material removal of metallic workpieces for an aesthetic or functionalized structuring. This work deals with the question, why does a smoothing effect occurs and what are the mechanisms behind it' The results show, that the surface smoothing is based on the preferred material removal of the roughness peaks compared to the valleys, as well as microstructure related limits of the surface quality. This might be caused not by one single, but a combination of electrical, thermal and physicochemical mechanisms. These effects can be used for the controlled and selective surface polishing.

      PubDate: 2018-05-28T10:02:34Z
       
  • Process mechanism in ultrasonic cavitation assisted fluid jet polishing
    • Abstract: Publication date: Available online 10 May 2018
      Source:CIRP Annals
      Author(s): Anthony Beaucamp, Tomoya Katsuura, Kie Takata
      Material removal rate in fluid jet polishing is significantly enhanced when ultrasonic cavitation bubbles are introduced at the nozzle outlet. In this paper, two theories are put forward to explain the process mechanism: a micro-scale hypothesis in which the surface is micro-jetted by collapsing bubbles, and a macro-scale hypothesis in which vibration of the fluid in the impingement region increases abrasive particle erosive action. Experimental investigation suggests the higher likelihood of the macro-scale phenomenon, and a material removal model is proposed accordingly. Process footprints simulated by this model were found to agree well with experimental measurements.

      PubDate: 2018-05-28T10:02:34Z
       
  • Increased productivity in centerless grinding using inertial active
           dampers
    • Abstract: Publication date: Available online 10 May 2018
      Source:CIRP Annals
      Author(s): D. Barrenetxea, I. Mancisidor, X. Beudaert, J. Munoa
      Regenerative chatter during centerless grinding processes is one of the main factors limiting the productivity. This paper presents a novel chatter suppression technique for centerless grinding using an active damping system based on inertial actuators. Dynamic characterisation of the machine with and without active damping is used first to compute theoretical stability maps. The active nature of the system allows stabilising a wide working range of infeed operations. Finally, experimental results validate the predicted increase of stable grinding area and verify that the technology is very effective for avoiding chatter, ensuring workpiece quality and increasing process productivity.

      PubDate: 2018-05-28T10:02:34Z
       
  • Friction coefficients in cold forging: A global perspective
    • Abstract: Publication date: Available online 9 May 2018
      Source:CIRP Annals
      Author(s): P. Groche, P. Kramer, N. Bay, P. Christiansen, L. Dubar, K. Hayakawa, C. Hu, K. Kitamura, P. Moreau
      Worldwide, at least twenty different tribological tests have been proposed for the empirical determination of friction coefficients in cold forging processes. Due to the varying test setups, means of measurement, and level of abstraction, the comparability of the outcomes is, however, disputable. Within this work, six established test principles are compared using identical tribological systems. Large differences between the empirically determined friction coefficients are observed but can be explained under consideration of the respective tribological loads. Additional investigations of an extrusion process reveal that friction models also have to take into account the varying local thickness of the lubricant film.

      PubDate: 2018-05-28T10:02:34Z
       
  • Innovative measurement technique to determine equibiaxial flow curves of
           sheet metals using a modified Nakajima test
    • Abstract: Publication date: Available online 8 May 2018
      Source:CIRP Annals
      Author(s): Matthias Eder, Christian Gaber, Winfried Nester, Hartmut Hoffmann, Wolfram Volk
      Since an inhomogeneous punch pressure distribution occurs in the Nakajima test, equibiaxial flow curves have been determined solely in the hydraulic bulge test so far. By using an innovative measurement technique, it is possible to determine both the punch pressure and strains that occur in the Nakajima test. In this paper, a calibration and realization strategy is presented that allows to determine accurate equibiaxial flow curves for sheet metal materials using a modified Nakajima test without inverse parameter identification. This setup is suitable to substitute the expensive and time-consuming hydraulic bulge test by a simple and common experimental setup.

      PubDate: 2018-05-28T10:02:34Z
       
  • Temperature calculation in cutting zones
    • Abstract: Publication date: Available online 8 May 2018
      Source:CIRP Annals
      Author(s): Hans-Christian Möhring, Valerii Kushner, Michael Storchak, Thomas Stehle
      This paper presents methods for refining the calculation of cutting temperatures. The heat flow densities and temperatures in the chip forming area, the accumulation zone and the area of the plastic contact between chip and tool affect the cutting temperature considerably. The new method takes the heat distribution for moving sources into account. The temperature in the contact between the flank face and the workpiece is calculated considering how friction and the accumulation zone affect the cutting temperature in the tertiary cutting zone. The methods incorporate material softening during temperature increase. The models are verified by experimental analyses.

      PubDate: 2018-05-28T10:02:34Z
       
  • A standards-based approach for linking as-planned to as-fabricated product
           data
    • Abstract: Publication date: Available online 8 May 2018
      Source:CIRP Annals
      Author(s): Moneer Helu, Alex Joseph, Thomas Hedberg
      The digital thread links disparate systems across the product lifecycle to support data curation and information cultivation and enable data-driven applications, e.g., digital twin. Realizing the digital thread requires the integration of semantically-rich, open standards to facilitate the dynamic creation of context based on multiple viewpoints. This research develops such an approach to link as-planned (ISO 6983) to as-fabricated (MTConnect) product data using dynamic time warping. Applying this approach to a production part enabled the designer to make a more optimal decision from the perspective of the product lifecycle that would have otherwise been challenging to identify.

      PubDate: 2018-05-28T10:02:34Z
       
  • Adaptive inverse control of a galvanometer scanner considering the
           structural dynamic behavior
    • Abstract: Publication date: Available online 8 May 2018
      Source:CIRP Annals
      Author(s): M.F. Zaeh, S.J. Pieczona
      In industrial applications, scanner systems are utilized for several operations, but do not always meet the desired dynamics. Various controller-based approaches, which concentrate on simple trajectories or changes in operation points, have been presented within the last years; however, these are not sufficient for many production processes. In this paper, adaptive inverse control is utilized to enhance the scanner’s dynamics. The influence of structural dynamics is compensated by taking the behavior of the galvanometers’ mirrors into account. The performance of the new approach is verified by experimental results, reducing the optical error by almost 95% compared to current scanner systems.

      PubDate: 2018-05-28T10:02:34Z
       
  • 3D printing of multiple metallic materials via modified selective laser
           melting
    • Abstract: Publication date: Available online 8 May 2018
      Source:CIRP Annals
      Author(s): Chao Wei, Lin Li, Xiaoji Zhang, Yuan-Hui Chueh
      Selective laser melting (SLM) is a powder bed layer-by-layer fusion technique mainly applied for additive manufacturing of 3D metallic components of complex geometry. However, the technology is currently limited to printing a single material across each layer. In many applications such as the manufacture of certain aero engine components, conformably cooled dies, medical implants and functional gradient structures, printing of multiple materials are desirable. This paper reports an investigation into the 3D printing of multiple metallic materials including 316L stainless steel, In718 nickel alloy and Cu10Sn copper alloy within a single build-up process using a specially designed multiple material SLM system combining powder-bed with point by point powder dispensing and selective material removal, for the first time. Material delivery system design, multiple material interactions, and component characteristics are described and the associated mechanisms are discussed.

      PubDate: 2018-05-28T10:02:34Z
       
  • Enhancing development trajectories of synthetic environments
    • Abstract: Publication date: Available online 7 May 2018
      Source:CIRP Annals
      Author(s): Roy Damgrave, Eric Lutters
      This research presents a framework that supports all stakeholders in the development of a Synthetic Environment. Guidance and support are provided throughout the entire process of development. Multiple disciplines are involved in this process, and the communication and collaboration between them is facilitated in such a way that mutual understanding is enhanced. Moreover, the rationale of decisions made throughout the development can be documented and accessed in such a way that all stakeholders can review and comprehend these decisions in relation to the prior and underlying decision-making processes.

      PubDate: 2018-05-28T10:02:34Z
       
  • A multi-sensor approach for failure identification during production
           enabled by parallel data monitoring
    • Abstract: Publication date: Available online 7 May 2018
      Source:CIRP Annals
      Author(s): Matthias Putz, Thomas Wiener, Alexander Pierer, Michael Hoffmann
      Modern production is becoming more complex and diverse, while requirements for reliability, consistency, sustainability and quality are significantly increasing. For automated inspection and control, sensors with ever-higher accuracy are required. Furthermore, data from multiple sensors have to be simultaneously collected and analyzed in order to identify the state of production and possible failures. Thus, the acquisition of relevant information and data from various sensors is a difficult task. A novel framework is proposed for parallelized multi-sensor monitoring which enables an automatic distribution of complex data processing tasks to multi-core computing hardware. The framework allows the subdivision of complex data processing problems into simple parallel entities. This is demonstrated by using a multi-camera system for failure monitoring of sheet metal parts. As a result, benefits could be achieved in terms of minimum detectable failure sizes and inspection speed, enabling 100% inline inspection of produced parts.

      PubDate: 2018-05-28T10:02:34Z
       
  • Modelling of ball screw drives rolling element contact characteristics
    • Abstract: Publication date: Available online 7 May 2018
      Source:CIRP Annals
      Author(s): Christian Brecher, Bastian Eßer, Jens Falker, Florian Kneer, Marcel Fey
      Due to their high efficiency and positioning accuracy, ball screw drives are the most frequently used feed drives in modern machine tools. Important properties, such as the ball screw drives stiffness and friction, depend on the load distribution and the characteristics of each rolling element contact. Detailed knowledge of the system and the contact characteristics is the basis for advanced durability and thermal modelling of ball screw drives. In this paper, a methodology to calculate ball screw drives load distribution and rolling element contact characteristics is introduced. The model is used to analyze the influence of the elastic deformation of nut and spindle on each rolling element contact with regard to the occurring forces, pressures and load angles. Experimentally measured load-displacement characteristics validate the calculation methodology.

      PubDate: 2018-05-28T10:02:34Z
       
  • Model-based design and simulation of smart factory from usage and
           functional aspects
    • Abstract: Publication date: Available online 7 May 2018
      Source:CIRP Annals
      Author(s): Hitoshi Komoto, Keijiro Masui
      Usage and functional aspects of smart factory are used to express its design concepts in terms of the roles and activities of stakeholders and the functions of system elements. This study proposes a model-based framework for developing use cases of smart factory, which satisfies two competing requirements; easy-to-use composition of design concepts from these aspects and simulation-based analysis of design concepts. The framework can simulate prognostics services for machine tools connected with the service platform, and those for machine tools equipped with self-prognostics functions and it can analyse their differences regarding the performance and its progress of prognostics services.

      PubDate: 2018-05-28T10:02:34Z
       
  • Data-driven production control for complex and dynamic manufacturing
           systems
    • Abstract: Publication date: Available online 7 May 2018
      Source:CIRP Annals
      Author(s): Enzo M. Frazzon, Mirko Kück, Michael Freitag
      Digitalization allows for production control based on the current state of the manufacturing system. Thereof, this paper proposes and applies a data-driven adaptive planning and control approach that uses simulation-based optimization to determine most suitable dispatching rules in real-time under varying conditions. The data integration between the real manufacturing system and the simulation model is implemented through a data-exchange framework. The approach is evaluated in a scenario of a Brazilian manufacturer of mechanical components for the automotive industry, achieving better operational performance compared to the procedure previously applied by the company as well as in comparison to static dispatching rules.

      PubDate: 2018-05-28T10:02:34Z
       
  • Error mapping of rotary tables in 4-axis measuring devices using a ball
           plate artifact
    • Abstract: Publication date: Available online 7 May 2018
      Source:CIRP Annals
      Author(s): Qichang Wang, Jimmie Miller, Axel Von Freyberg, Norbert Steffens, Andreas Fischer, Gert Goch
      Rotary tables as components of 4-axis measuring devices provide a quick rotary positioning in geometry measurements, but the non-trivial error motions need to be determined and compensated. This paper presents a new solution for the error mapping, which calibrates the rotary table, the 3-axis measuring device and the artifact (circular ball plate) simultaneously. Multi-measuring and approximation techniques are introduced to identify and quantify the error motions based on obtained point clouds. A mathematical model covers all the deviation sources, occurring at the movement of a rotary axis. Simulations and experimental results verify and validate the solution. The simple and flexible calibration setup together with the developed evaluation procedure enable a compensation of rotary table/axis deviations in a wide application field.

      PubDate: 2018-05-28T10:02:34Z
       
  • Smart, simulation-based resource sharing in federated production networks
    • Abstract: Publication date: Available online 7 May 2018
      Source:CIRP Annals
      Author(s): Botond Kádár, Péter Egri, Gianfranco Pedone, Takafumi Chida
      The rise of Industry 4.0 and the convergence of the digital and physical worlds increasingly, where not radically, transforms the production networks. The paper presents the preliminary results of a distributed collaboration framework developed with the aim to facilitate the cooperation of various production sites. The objective is to manage a network of manufacturers who can dynamically re-configure and share their resources within a pre-registered community and analyze how the cardinality of the federation influences both the cooperation and the global and local production KPI-s. The novelty of the concept is the combination of the agent-based control, the matching algorithm combined with the detailed digital simulation of the distributed production systems and the collaborative IT platform.

      PubDate: 2018-05-28T10:02:34Z
       
  • Trend-specific clustering for micro mass production of linked parts
    • Abstract: Publication date: Available online 5 May 2018
      Source:CIRP Annals
      Author(s): Kirsten Tracht, Ann-Kathrin Onken, Phil Gralla, Joel Haji Emad, Niklas Kipry, Peter Maaß
      In micro production, small tolerances, as well as size effects increase the requirement for a fast, precise, and reliable methodology that enhances the output of assemblies. In contrast to conventional approaches, a widening of the tolerance field enables an overall improvement of the output of a process chain while assuring functionality of parts. Therefore, the consideration of trends for building sections is essential for increasing the outcome by identifying sections that can be matched. This paper presents the Linked Parts Clustering Algorithm for the identification of trend-specific clusters in linked parts and demonstrates the area of application.

      PubDate: 2018-05-28T10:02:34Z
       
  • Smart pressure distribution estimation in biological joints for mechanical
           bio-inspired design
    • Abstract: Publication date: Available online 5 May 2018
      Source:CIRP Annals
      Author(s): Elia Picault, Emmanuel Mermoz, Thomas Thouveny, Jean-Marc Linares
      Designing new mechanical links using bio-inspiration requires the knowledge of operating contact pressure in biological joints. However, the contact pressure magnitude and distribution are difficult to measure experimentally without disrupting the functioning of the articulation. In this paper, a new methodology to estimate the pressure distribution in biological joints is presented. A robust finite element model was developed based on in-vitro precise measurements of shapes, relative positions and loads in order to get accurate results. Furthermore, the envelope of the contact area was obtained through thermal imaging for comparison with the numerical results and qualitative validation of the FE model.

      PubDate: 2018-05-28T10:02:34Z
       
  • Brainwaves driven human-robot collaborative assembly
    • Abstract: Publication date: Available online 5 May 2018
      Source:CIRP Annals
      Author(s): Abdullah Mohammed, Lihui Wang
      This paper introduces an approach to controlling an industrial robot using human brainwaves as a means of communication. The developed approach starts by establishing a set of training sessions where an operator is enquired to think about a set of defined commands for the robot and record the brain activities accordingly. The results of the training sessions are then used on the shop floor to translate the brain activities to a set of robot control commands. An industrial case study is carried out to assist the operator in coordinating a collaborative assembly task of a car engine manifold.

      PubDate: 2018-05-28T10:02:34Z
       
  • Additive manufacturing of metal components with the ARBURG plastic
           freeforming process
    • Abstract: Publication date: Available online 5 May 2018
      Source:CIRP Annals
      Author(s): Quirin Spiller, Jürgen Fleischer
      Using the ARBURG freeformer in the metal injection molding (MIM) process chain instead of an injection molding machine for molding the parts constitutes a new approach for the additive production of sintered metal components. Its main benefits are toolless manufacturing and using the conventional MIM feedstock. This paper presents this kind of approach with a carbonyl iron feedstock. The investigation includes the determination of the influences of the relevant printing process parameters on the mechanical properties of the sintered parts and the comparison with MIM. Experimental results are discussed, including an analysis of microsections, density, tensile strength Rm and shrinkage.

      PubDate: 2018-05-28T10:02:34Z
       
  • Deep learning-based human motion recognition for predictive context-aware
           human-robot collaboration
    • Abstract: Publication date: Available online 5 May 2018
      Source:CIRP Annals
      Author(s): Peng Wang, Hongyi Liu, Lihui Wang, Robert X. Gao
      Timely context awareness is key to improving operation efficiency and safety in human-robot collaboration (HRC) for intelligent manufacturing. Visual observation of human workers’ motion provides informative clues about the specific tasks to be performed, thus can be explored for establishing accurate and reliable context awareness. Towards this goal, this paper investigates deep learning as a data driven technique for continuous human motion analysis and future HRC needs prediction, leading to improved robot planning and control in accomplishing a shared task. A case study in engine assembly is carried out to validate the feasibility of the proposed method.

      PubDate: 2018-05-28T10:02:34Z
       
 
 
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