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ENGINEERING (1199 journals)                  1 2 3 4 5 6 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Full-text available via subscription   (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: 217)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
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: 10)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 4)
Advanced Science     Open Access   (Followers: 4)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 5)
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: 9)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 19)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 23)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
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: 35)
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: 28)
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: 27)
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: 8)
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)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 2)
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: 7)
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: 7)
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: 3)
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: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 31)
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: 1)
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     Full-text available via subscription   (Followers: 13)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 40)
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: 2)
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: 23)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 252)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 176)
Composites Part B : Engineering     Hybrid Journal   (Followers: 222)
Composites Science and Technology     Hybrid Journal   (Followers: 164)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 12)
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: 25)
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: 8)
Computing and Visualization in Science     Hybrid Journal   (Followers: 6)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 25)
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: 41)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 24)
CT&F Ciencia, Tecnologia y Futuro     Open Access  
CTheory     Open Access  

        1 2 3 4 5 6 | Last

Journal Cover CIRP Annals - Manufacturing Technology
  [SJR: 2.207]   [H-I: 99]   [11 followers]  Follow
   Full-text available via subscription Subscription journal
   ISSN (Print) 0007-8506
   Published by Elsevier Homepage  [3031 journals]
  • Product personalization enabled by assembly architecture and cyber
           physical systems
    • Abstract: Publication date: Available online 22 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Changbai Tan, S. Jack Hu, Haseung Chung, Kira Barton, Cecil Piya, Karthik Ramani, Mihaela Banu
      Personalization is an emerging manufacturing paradigm towards meeting diversified customer needs. This paper proposes a framework for producing personalized products efficiently. An approach for optimal mix of different module types is proposed in order to construct a proper assembly architecture. Sketch-based modeling, which facilitates easy model creation and modification by customers, is presented as a key to personalized design. A cyber physical system provides the platform for the collaborative design and co-creation of personalized products. A case study on personalized bicycles based on the proposed framework is presented. Such a framework enables open product realization through active customer participation.

      PubDate: 2017-05-23T11:34:16Z
  • Controlling surface topography using pulsed laser micro structuring
    • Abstract: Publication date: Available online 22 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Frank E. Pfefferkorn, Justin D. Morrow
      There is significant interest in controlling surface topography on metal parts including smoothing rough or wavy surfaces, adding aesthetic features, and creating functional structures. Pulsed laser micro structuring (PLμS) dynamically manipulates each pulse fluence during laser remelting to create a net, mass-neutral, lateral displacement of material several times greater than the melt pool diameter. This paper presents experimental investigations into specific process capabilities, example applications, and a novel phenomenological theory. The paper demonstrates how the resultant process can attenuate high-spatial-frequency roughness, correct mid-spatial-frequency error (i.e., waviness), and create desirable surface topography with a single laser system.

      PubDate: 2017-05-23T11:34:16Z
  • Sensor-less micro-tool contact detection for ultra-precision machine tools
           utilizing the disturbance observer technique
    • Abstract: Publication date: Available online 22 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Yasuhiro Kakinuma, Satoko Nagakari
      When molds for micro products are repaired, micromachining is typically required after the welding or cladding process. The contact position of the tool to the cladded material needs to be set before micromachining. However, precise setting of the tool to the workpiece is a technically difficult operation that requires manual adjustment and the introduction of external sensors. This paper proposes an observer-based automatic detection method for micro tool contact. An ultra-precision machine tool driven by a linear motor was utilized to demonstrate the effectiveness of the proposed sensor-less tool contact detection method. Experimental results showed that the observer-based tool detection method can detect submicron-level contact, which cannot be achieved manually.

      PubDate: 2017-05-23T11:34:16Z
  • A new route for semi-solid steel forging
    • Abstract: Publication date: Available online 22 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Tudor Balan, Eric Becker, Laurent Langlois, Régis Bigot
      Forging in semi-solid state significantly extends the possibilities of classical hot forging. In order to fully exploit its potential, the process requires a specific and demanding environment, penalizing its industrial deployment. In this context, an alternative route is proposed. In the proposed process, semi-solid zones at the heart of the material coexist with surrounding solid zones within the part. The outcome is an optimized process where the benefits of thixoforging are reached at a significant extent within the classical process framework of hot forging. The paper investigates this proposal up to a full-scale proof-of-concept in an industrial setting.

      PubDate: 2017-05-23T11:34:16Z
  • A novel superplastic dieless drawing process of ceramic tubes
    • Abstract: Publication date: Available online 21 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): T. Furushima, K. Manabe
      A novel superplastic dieless drawing was performed for fabrication of ceramic tubes. The reduction in area of tube obtained through the drawing was controlled by changing feeding and drawing speeds. Some tested tubes showed extremely low drawing stress of 15MPa and high value of strain rate sensitivity parameter of 0.42. Furthermore, the maximum reduction in area of 84% was accomplished through single pass drawing. Thus, the ceramic tubes showed a good superplasticity in the proposed process. The conclusion is that the proposed superplastic dieless drawing can be widely used for efficient fabrication of various ceramic tubes.

      PubDate: 2017-05-23T11:34:16Z
  • A functional approach to integrating grinding temperature modeling and
           Barkhausen noise analysis for prediction of surface integrity in bearing
    • Abstract: Publication date: Available online 20 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Uppiliappan Sridharan, Vikram Bedekar, Francis M. Kolarits
      The use of NDE techniques such as Barkhausen Noise Analysis (BNA) for detection of grinding induced thermal damage is often application specific due to variables in the grinding process. In this paper, Malkin’s grinding energy partition model is applied in conjunction with BNA to reliably predict occurrence of thermal damage in through-hardened bearing steels independent of grinding variables. Various intensities of material transformation such as surface, sub-surface retempering and rehardening were accurately detected and validated by metallography and residual stress analysis. The results demonstrate that material-specific models independent of grinding process variables can be effectively utilized to predict thermal damage.

      PubDate: 2017-05-23T11:34:16Z
  • Advanced fatigue analysis of metal lattice structures produced by
           Selective Laser Melting
    • Abstract: Publication date: Available online 20 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Brecht Van Hooreweder, Jean-Pierre Kruth
      Additive manufacturing techniques such as Selective Laser Melting (SLM) are highly suitable for producing lattice structures with complex unit cell designs. These structures can be designed and built in such a way that their properties match the needs for both medical and structural parts. This paper presents a novel local stress method for fatigue analysis of such SLM lattice structures. The fatigue performance of Ti6Al4V and CoCr structures produced by SLM is assessed with this method. In addition, life-prolonging post-SLM heat and surface treatments are studied. The resulting methods and treatments can be extended to other types of AM structures.

      PubDate: 2017-05-23T11:34:16Z
  • Influence of surface roughness on computed tomography dimensional
    • Abstract: Publication date: Available online 19 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Simone Carmignato, Valentina Aloisi, Fabrizio Medeossi, Filippo Zanini, Enrico Savio
      X-ray computed tomography (CT) is increasingly used in dimensional metrology. However, several influencing factors affect CT dimensional measurements. In particular, significant deviations can be observed between CT and tactile measurements especially when measuring parts with rough surfaces. The dependence of such deviations from surface morphology has not been thoroughly studied yet. In this work, the influence of surface roughness on CT dimensional measurements is investigated considering the combined effect of surface morphology and CT measurement characteristics. Experimental investigations and numerical simulations are used to determine the systematic effect on CT dimensional measurements for roughness profiles with different material distribution.

      PubDate: 2017-05-23T11:34:16Z
  • Forming-induced damage and its effects on product properties
    • Abstract: Publication date: Available online 19 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): A. Erman Tekkaya, Nooman Ben Khalifa, Oliver Hering, Rickmer Meya, Sebastian Myslicki, Frank Walther
      Damage is caused in the microstructure of metals during forming. Damage is not a failure, but affects the mechanical properties of the component under service loads. This paper explores experimentally the effect of metal forming process parameters on the evolution of damage and the resulting product properties. As a representative for bulk forming processes, cold forging is investigated. It is shown that an increase of the extrusion ratio leads to lower damage and increased fatigue strength. Air bending, as a sheet forming process, is analysed, exhibiting that damage can be influenced by process design such as the superposition of stresses.

      PubDate: 2017-05-23T11:34:16Z
  • Dynamic jamming in dense suspensions: Surface finishing and edge honing
    • Abstract: Publication date: Available online 19 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Joseph Span, Philip Koshy, Fritz Klocke, Sebastian Müller, Reginaldo Coelho
      This paper presents the proof-of-concept of an innovative finish machining process wherein material is removed by abrasives suspended in a dense aqueous mixture of cornstarch, which serves as a smart finishing medium. Depending on the mode and rate at which said suspension is subject to strain, it transforms rapidly and reversibly, from being liquid-like, to a state that exhibits jamming-induced solid-like behaviour. This facilitates fine control over the level of mechanical interaction between the workpiece and the abrasives. The research clarifies fundamental process mechanics, and demonstrates the efficacy of exploiting this intriguing phenomenon in surface finishing and edge honing applications.

      PubDate: 2017-05-23T11:34:16Z
  • Study on wire electrochemical machining assisted with large-amplitude
           vibrations of ribbed wire electrodes
    • Abstract: Publication date: Available online 18 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): X.L. Fang, X.H. Zou, M. Chen, D. Zhu
      A large-amplitude vibration of wire electrode tool is introduced to enhance electrolyte renewal and bubble removal in wire electrochemical machining. It is verified via simulation and high-speed video that hydrogen bubbles generated in electrochemical reactions can be expelled effectively from the machining gap by means of large-amplitude vibrations and a better effect was obtained in the upward duration. A ribbed wire electrode is employed to intensify electrolyte renewal process due to its specific structure. The experimental results demonstrated that the proposed large-amplitude vibration and ribbed electrode significantly accelerate electrolyte renewal, thereby hastening material removal rate and improving machining efficiency.

      PubDate: 2017-05-23T11:34:16Z
  • Linear programming and windowing based feedrate optimization for spline
    • Abstract: Publication date: Available online 14 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Kaan Erkorkmaz, Qing-Ge (Christina) Chen, Ming-Yong Zhao, Xavier Beudaert, Xiao-Shan Gao
      Optimality and computational efficiency are competing objectives in the design of feedrate optimization algorithms for spline toolpaths. This paper presents a new approach, in which the use of Linear Programming (based on the ‘pseudo-jerk’ concept) is combined with a novel windowing algorithm to handle long toolpaths. The windowing uses the Principle of Optimality to select suitable connection points between adjacent portions of the feed profile. The result is an algorithm with linear computational complexity, and the ability to process long toolpaths in a parallel manner. Simulations and experimental results confirm negligible compromise in machining cycle time and dynamic accuracy.

      PubDate: 2017-05-18T07:48:21Z
  • Prediction of polishing pressure distribution in CMP process with airbag
           type wafer carrier
    • Abstract: Publication date: Available online 14 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): N. Suzuki, Y. Hashimoto, H. Yasuda, S. Yamaki, Y. Mochizuki
      This paper presents a CMP process analysis considering an airbag type wafer carrier, which is used in semiconductor devices manufacturing. In the CMP process, a wafer is compressed against the polishing pad inside the wafer carrier, which consists of the retainer ring and the membrane film. Structural analysis model is developed to estimate contact pressure distribution over the wafer surface considering the airbag compression behaviour. The polishing experiment without wafer rotation indicated a unique pressure variation around the trailing edge of the wafer. The developed analysis estimated the same phenomena accurately and clarified the mechanism deteriorating the polishing pressure uniformity.

      PubDate: 2017-05-18T07:48:21Z
  • Increasing productivity in assembling z-folded
           electrode-separator-composites for lithium-ion batteries
    • Abstract: Publication date: Available online 13 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Muhammed Aydemir, Arne Glodde, Robert Mooy, Gordon Bach
      Lithium-ion batteries (LIB) are key components of electromobility and a major cost factor of electric-vehicles. With a rising demand, affordable LIB become a success-factor for electromobility. LIB have different electrode-separator-composite-designs. Assembling a z-folded composite is currently characterized through time-consuming sequential pick-and-place operations for handling discrete electrodes and folding uncoiled-strip separators, causing high manufacturing costs. To avoid time-consuming sequential handling tasks, a novel process featuring a continuous separator feeding-speed and a high-speed synchronous handling of discrete electrodes has been developed, hereby enabling for a significant decrease of cycle-times and thus reducing manufacturing costs.

      PubDate: 2017-05-18T07:48:21Z
  • Analytical model and experimental investigation of electromagnetic tube
           compression with axi-symmetric coil and field shaper
    • Abstract: Publication date: Available online 12 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Brad Kinsey, Ali Nassiri
      In this study, a computationally cost effective, pure analytical model was developed for a multi-turn, axisymmetric coil with field shaper to predict the magnetic pressure and velocity during electromagnetic tube compression. This model is electro-magnetic-mechanically coupled with tube position affecting the magnetic field generated at each time increment. The mechanics-based analytical approach is different than past research and includes experimentally determined coupling coefficients between the coil, field shaper, and tube. To validate the analytical model, experimental tests with Photon Doppler Velocimetry (PDV) were conducted. The results show reasonably good agreement between the analytical and experimental results.

      PubDate: 2017-05-18T07:48:21Z
  • Optimal control of flexible drives with load side feedback
    • Abstract: Publication date: Available online 12 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Burak Sencer, Alper Dumanli
      This paper presents a new method for designing accurate motion control laws for high-speed feed drives with structural flexibility. The controller design utilizes only table (load) side feedback measurements to achieve active vibration damping and accurate tracking. Table jerk is penalized in the feedback to inject modal damping. Optimal control theory is used to tune controller for disturbance rejection and active vibration damping. In addition to good low frequency disturbance attenuation, proposed controller actively utilizes structure’s anti-resonance to reject high frequency disturbances. Controller is implemented on a ball-screw drive, and its effectiveness is demonstrated in high-speed tracking experiments against industry standard P-PI control.

      PubDate: 2017-05-18T07:48:21Z
  • Data-assimilated lifecycle simulation for adaptive product lifecycle
    • Abstract: Publication date: Available online 12 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Shinichi Fukushige, Masaki Nishioka, Hideki Kobayashi
      This paper proposes a data-assimilated lifecycle simulation (DA-LCS) system. Data assimilation (DA) is a self-adjustment method for decreasing differences between a simulation and observation data from an actual-system by conforming the simulation model parameters to the observation at appropriate time intervals. The proposed system applies DA to LCS for adaptive operations in product lifecycle management. A case study of the lifecycle of a photovoltaic panel reuse business shows that DA-LCS successfully merges measurement data acquired from actual business operations into the LCS model, and sequentially revises the simulation estimations through DA.

      PubDate: 2017-05-18T07:48:21Z
  • A framework for the automated design and modelling of soft robotic systems
    • Abstract: Publication date: Available online 12 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Gundula Runge, Annika Raatz
      The introduction of collaborative robots is expected to have a positive impact on industrial assembly. In this respect, new generations of robots that can deform and yield in a collision, thus being less harmful, seem a promising supplement to traditional rigid-link robots. Recently, these so-called soft robots have received significant attention and are now beginning to unfold their potential in industrial automation. This paper presents a framework for a soft robot design and modelling tool that effectively combines finite element analysis, continuum robot modelling, and machine learning. To validate the proposed method, a soft actuator is designed, modelled, and tested.

      PubDate: 2017-05-18T07:48:21Z
  • Dependant Gaussian processes regression for intelligent sampling of
           freeform and structured surfaces
    • Abstract: Publication date: Available online 11 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Yuehong Yin, Ming Jun Ren, Lijian Sun
      Multi-sensor measurement of complex surfaces requires appropriate sampling to achieve holistic measurement with improved accuracy and efficiency. This paper presents an intelligent sampling strategy for such measurement. A multi-sensor data fusion algorithm is developed based on dependant Gaussian processes regression model and is served as the mathematical foundation to perform adaptive sampling of the surfaces with Bayesian inference by taking the bias and the variance of the fused model as the sampling criteria. The characteristics of the surface features are taken into account by designing domain specific kernel functions. Experimental work on a variety of complex surfaces is also presented.

      PubDate: 2017-05-13T04:30:15Z
  • Automatic tuning of active vibration control systems using inertial
    • Abstract: Publication date: Available online 11 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): M.F. Zaeh, R. Kleinwort, P. Fagerer, Y. Altintas
      Material removal rates of machine tools are mainly limited by chatter, which is caused by the machine’s most flexible structural modes. Active damping of the structural modes requires the identification of a machine dynamics model used in tuning the active controller. This complex process has to consider uncertainties, actuator saturation, and the stability of the controller. This paper presents an automated identification of machine dynamics and auto-tuning of the controller using the same actuator and vibration sensor. The proposed method has been experimentally demonstrated with simple and advanced controllers which led to notable increases in chatter free material removal rates.

      PubDate: 2017-05-13T04:30:15Z
  • Electrolyte design for suspended particulates in electrolyte jet
    • Abstract: Publication date: Available online 11 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Adam T. Clare, Alistair Speidel, Jonathon Mitchell-smith, Siddharth Patwardhan
      The addition of particles (<1μm) to electrolyte feedstocks results in marked changes to the morphology of deposits when electrolyte jet processing (EJP) compared to electrolyte only feedstocks. Through the use of a ‘carrier’ electrolyte in additive mode these particulates may become embedded within a deposited matrix. These also serve as nucleation points for crystallisation. This allows opportunities for creating complex surface coatings and incorporating materials independent of crystallisation phenomena. Control of the microscale morphology of these is demonstrated here through the addition of the brightening agent – thiourea and the buffer – sodium sulfate. Here acidity and hence electric surface potential are modified and the response upon deposition evaluated.

      PubDate: 2017-05-13T04:30:15Z
  • Manufacturing energy analysis of lithium ion battery pack for electric
    • Abstract: Publication date: Available online 11 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Chris Yuan, Yelin Deng, Tonghui Li, Fan Yang
      Lithium ion batteries (LIB) are widely used to power electric vehicles. Here we report a comprehensive manufacturing energy analysis of the popular LMO-graphite LIB pack used on Nissan Leaf and Chevrolet Volt. A 24kWh battery pack with 192 prismatic cells is analysed at each manufacturing process from mixing, coating, calendaring, notching till final cutting and assembly, with data collected and modelled from real industrial processes. It is found that 29.9GJ of energy is embedded in the battery materials, 58.7GJ energy consumed in the battery cell production, and 0.3GJ energy for the final battery pack assembly.

      PubDate: 2017-05-13T04:30:15Z
  • Chatter avoidance in cutting highly flexible workpieces
    • Abstract: Publication date: Available online 9 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Gabor Stepan, Adam K. Kiss, Behnam Ghalamchi, Jussi Sopanen, Daniel Bachrathy
      Robust stability analysis of turning is presented for flexible workpiece. The varying dynamic properties due to the material removal process is modelled by means of finite element method. The Frequency Response Function is traced along tool position. The results show significant change in the natural frequency and modal stiffness, which have strong influence on regenerative chatter vibration. Different sections of the multiple-parameter stability lobe diagram are presented and validated with experimental results. The robust stable parameters of initial diameter and chip width are identified for which no chatter occurs along the whole tool position for any spindle speed.

      PubDate: 2017-05-13T04:30:15Z
  • Hybrid tool for high performance structuring and honing of cylinder liners
    • Abstract: Publication date: Available online 8 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Dominik Dahlmann, Berend Denkena
      Micro-structuring of cylinder liners reduces friction of combustion engines. However, the process time of known fly-cutting and even laser micro machining is too long. This paper presents a hybrid tool for high performance structuring and finish-honing. The structuring tool is driven by a piezo actuator. A positioning system and control algorithms were developed to overcome the limited travelling range of the piezo and to deal with workpiece errors. Furthermore, the entire process chain and machined surfaces of the liners are examined. It is shown that the structuring of common grooves is up to 6 times faster compared to laser machining.

      PubDate: 2017-05-13T04:30:15Z
  • Electrochemical machining using porous electrodes fabricated by powder bed
           fusion additive manufacturing process
    • Abstract: Publication date: Available online 6 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Tomohiro Koyano, Akira Hosokawa, Ryota Igusa, Takashi Ueda
      A new tool electrode having a porous structure is developed for electrochemical machining (ECM), in which electrolyte fluid can be forced through its permeable structure. This electrode can be easily fabricated using a laser sintering technique of additive manufacturing. Small pores and large porosity can be obtained using a higher laser scanning speed, which increases the flow rate of the electrolyte. ECM results show that a nearly flat surface of the machined hole is obtained and small pores are less likely to cause protrusions on the machined surface. Moreover, the machining speed can be increased as the flow rate increases.

      PubDate: 2017-05-08T09:52:04Z
  • The application of computational fluid dynamics to vibratory finishing
    • Abstract: Publication date: Available online 6 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): B. Mullany, H. Shahinian, J. Navare, F. Azimi, E. Fleischhauer, P. Tkacik, R. Keanini
      Vibratory finishing processes are finding increased application in the finishing of high value metallic components. Despite the growth of these processes, few models exist to predict workpiece material removal variations and surface finish uniformity. This paper explores the potential of modelling the media as a continuum and utilizing commercial computational fluid dynamic (CFD) packages to predict local velocity and pressure fields around stationary workpieces. Predicted 2D velocity fields are compared to those measured via Particle Image Velocimetry. Initial insights are provided on how local media fields and the system’s driving frequency combine to affect the resulting workpiece topography.

      PubDate: 2017-05-08T09:52:04Z
  • Springback measurement in three roll push bending process of hollow
           structural sections
    • Abstract: Publication date: Available online 6 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Andrea Ghiotti, Enrico Simonetto, Stefania Bruschi, Paolo F. Bariani
      Three roll push bending is largely used to manufacture curved hollow structural sections. In this process, when new production batches are launched, long and repetitive trials-and-error procedures are necessary to compensate for the springback that may affect the final geometrical accuracy. Several off-line optimization techniques, both experimental and numerical, are available, but they require costly material characterizations and long computational times. The paper presents a new in-line approach based on inertial measurement techniques, which allows the accurate real-time measurement of the bent geometry during the process. The validation experiments are presented as well as the evaluation of the measurement accuracy.

      PubDate: 2017-05-08T09:52:04Z
  • Assessment of environmental performance of shaped tube electrolytic
           machining (STEM) and capillary drilling (CD) of superalloys
    • Abstract: Publication date: Available online 6 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Anjali K.M. De Silva, Janaka R. Gamage, Colin S. Harrison
      This paper presents an environmental impact assessment of two specialised electrochemical machining processes, STEM and CD, which are used for making cooling holes in turbine blades for aerospace applications. An industry friendly data collection framework was developed taking insights from CO2PE! and ISO 14044:2006 for ascertaining unit process lifecycle inventories (UPLCI). The ‘ReCiPe2008’ LCA method was used to analyse the environmental impact from a holistic point of view, the contribution from each inventory item, and the impact at the endpoint level. An uncertainty analysis was also performed to assess and improve the credibility of the findings.

      PubDate: 2017-05-08T09:52:04Z
  • Opportunities in laser cutting with direct diode laser configurations
    • Abstract: Publication date: Available online 5 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Gonçalo Costa Rodrigues, Joost R. Duflou
      This paper explores the opportunities associated with the use of well-designed direct diode laser configurations for cutting of metal sheets. Continuously improving diode stacking, and consequently greater brightness, allow the requirements for laser cutting to be met without the use of further brightness converters (diode-pumped solid state lasers). This contributes to a reduction in the number of optical components and increased energy efficiency. Furthermore, laser architecture related degrees of freedom for tailoring the wavelength, beam polarization and beam shape are instrumental to increase the cutting performance. Different stacking configurations, optical structures and related cutting strategies are discussed, with performance validation through experimental verification.

      PubDate: 2017-05-08T09:52:04Z
  • Understanding evolution of tribo-chemical interfaces during boundary
           lubrication in manufacturing
    • Abstract: Publication date: Available online 5 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Wenyang Zhang, Salil Bapat, Ajay P. Malshe, K.P. Rajurkar
      Boundary lubrication during manufacturing processes especially at spindles, gears, machining interfaces, and other areas is an aggressive tribological condition resulting in the loss of energy, materials, and overall productivity. Nano-engineered lubricants have been explored to address lubrication challenges at nano/microscopic interfaces. However, lubrication mechanism at nano/microscopic interfaces is not fully understood. This paper reports investigation on tribo-chemical lubricant film formation mechanism using techniques of four-ball tribometer, SEM/EDS, Raman spectroscopy, and TEM to understand morphology, chemistry, and structure at interfaces as lubrication progresses over time. It was found that tribo-chemical film formation showed adaptive characteristics during lubrication for progressive surface protection.

      PubDate: 2017-05-08T09:52:04Z
  • A novel ultrasonic cavitation assisted fluid jet polishing system
    • Abstract: Publication date: Available online 5 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Anthony Beaucamp, Tomoya Katsuura, Zensaku Kawara
      Fluid jet polishing is a versatile process used for super-fine finishing of small and complex optical and prosthetic surfaces. Advantages of this process include highly controllable sub-millimetre polishing footprints and absence of tool wear, though the main drawback is very low material removal rate. To address this issue, a novel system was developed in which ultrasonic cavitation causes micro-bubble generation directly upstream of the nozzle outlet. Experimental data shows that these micro-bubbles boost removal rate by up-to 380%, without causing any degradation of the surface finish. This paper reports on the modelling, implementation, and testing of this new polishing system.

      PubDate: 2017-05-08T09:52:04Z
  • Motion planning and scheduling for human and industrial-robot
    • Abstract: Publication date: Available online 4 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Stefania Pellegrinelli, Andrea Orlandini, Nicola Pedrocchi, Alessandro Umbrico, Tullio Tolio
      Step-changes in safety technologies have opened robotic cells to human workers in real industrial scenarios. However, the lack of methodologies for a productive and effective motion planning and scheduling of human–robot cooperative (HRC) tasks is still limiting the spread of HRC systems. Standard methods fail due to the high-variability of the robot execution time, caused by the necessity to continuously modify the robot motion to grant human safety. In this context, the paper introduces an innovative integrated motion planning and scheduling methodology that (i) provides a set of robot trajectories for each task as well as an interval on the robot execution time for each trajectory and (ii) optimizes, at relevant time steps, a task plan, minimizing the cycle time through trajectory selection, task sequence and task allocation. The application of the approach to an industrial case is presented and discussed.

      PubDate: 2017-05-08T09:52:04Z
  • A non-orthogonal material model of woven composites in the preforming
    • Abstract: Publication date: Available online 4 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Weizhao Zhang, Huaqing Ren, Biao Liang, Danielle Zeng, Xuming Su, Jeffrey Dahl, Mansour Mirdamadi, Qiangsheng Zhao, Jian Cao
      Woven composites are considered as a promising material choice for lightweight applications. An improved non-orthogonal material model that can decouple the strong tension and weak shear behavior of the woven composite under large shear deformation is proposed for simulating the preforming of woven composites. The tension, shear and compression moduli in the model are calibrated using the tension, bias-extension and bending experiments, respectively. The interaction between the composite layers is characterized by a sliding test. The newly developed material model is implemented in the commercial finite element software LS-DYNA® and validated by a double dome study.

      PubDate: 2017-05-08T09:52:04Z
  • Combination of nano-particle deposition system and friction stir spot
           welding for fabrication of carbon/aluminum metal matrix composite joints
           of dissimilar aluminum alloys
    • Abstract: Publication date: Available online 3 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Sung-Tae Hong, Hrishikesh Das, Hyun-Seok Oh, Mohammad Nur E Alam Al Nasim, Doo-Man Chun
      A nano-particle deposition system is combined with friction stir spot welding (FSSW) of dissimilar aluminum alloys to fabricate a carbon/aluminum metal matrix composite (MMC) joint. Carbon materials in the form of graphite powder are deposited on an aluminum sheet at room temperature. Lap joints of dissimilar aluminum alloys are fabricated via FSSW using the carbon-deposited aluminum sheet as the upper sheet of the joint. The Raman spectroscopy confirms that carbon/aluminum MMC is successfully fabricated in the joint. The strength and toughness of the joint are clearly enhanced by fabricating the MMC, as shown in the result of mechanical tests.

      PubDate: 2017-05-08T09:52:04Z
  • Crater morphology evaluation of contemporary advanced EDM generator
    • Abstract: Publication date: Available online 3 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Andreas Klink, Maximilian Holsten, Lars Hensgen
      EDM generator technology has considerably evolved over the last decades in terms of power efficiency and process-based energy dissipation by application of advanced power electronics as well as real-time based control strategies. In this paper, nowadays achievable crater morphologies of contemporary advanced generator technologies are evaluated in context of surface functionality for selected roughness levels based on the well-known VDI3400 standard for surface characterization. Crater topographies are experimentally analyzed by application of tactile as well as optical roughness measurements and morphologies are studied by means of scanning electron microscopy. Finally, suggestions for appropriate extensions of the given standard will be presented.

      PubDate: 2017-05-08T09:52:04Z
  • Fabricating ceramic components with water dissolvable support structures
           by the Ceramic On-Demand Extrusion process
    • Abstract: Publication date: Available online 3 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Wenbin Li, Amir Ghazanfari, Devin McMillen, Ming C. Leu, Gregory E. Hilmas, Jeremy Watts
      This paper describes a further development of the novel Ceramic On-Demand Extrusion (CODE) process, with focus on fabricating ceramic components that have external/internal features and cannot be fabricated without the use of support structures. The minimum angle of a wedge-shaped part that can be fabricated using Al2O3 (alumina) paste without a support structure is first determined. An inorganic sacrificial material, CaCO3 (calcium carbonate), is then identified for building support structures. After fabrication the green part is dried and then sintered. During sintering, the main material densifies, while the sacrificial material decomposes and is then dissolved in water or acid. Sample parts are fabricated and evaluated.

      PubDate: 2017-05-08T09:52:04Z
  • Hierarchical and spatial modeling and bio-additive manufacturing of
           multi-material constructs
    • Abstract: Publication date: Available online 3 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Navid Khani, Ali Nadernezhad, Paulo Bartolo, Bahattin Koc
      In this paper, a novel method of integrated modelling and bio-additive manufacturing of hybrid bioinspired structures is presented. An algorithm is developed to generate optimized and continuous path plan while changing material and internal composition spatially and hierarchically based on the assigned functionality. Biodegradable polymers and hydrogels are used as reinforcing and biological functional bioinks respectively. A new hybrid multi-head 3D bioprinter is developed to manufacture designed three-dimensional constructs depositing bioinks layer-by-layer. Simultaneous incorporation of multiple deposition heads and integrated path planning provide the benefits of using the deposition-on-demand of multi-material bio-inks. The modelled constructs are analyzed and bioprinted.

      PubDate: 2017-05-08T09:52:04Z
  • A study on the influence of surface laser texturing on the adhesive
           strength of bonded joints in aluminium alloys
    • Abstract: Publication date: Available online 2 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): L. Romoli, F. Moroni, M.M.A. Khan
      The influence of ns-pulsed laser ablation on the adhesive strength of bonded joints was studied under conservative conditions by tensile stress tests on cylindrical specimens of aluminium alloy. Surface textures were produced by hatching the cross section with concentric grooves and varying the average laser power at fixed repetition rate, the scan speed and the radial hatch distance. Despite a range of surface activation in which the adhesive strength increases step-wise of about 25% with respect to the non-treated material, the effect of too high roughness values resulted in a decay of the joint strength. Air entrapment into the ablated grooves fixed a limit to the energy density that could be delivered to the surface, establishing an optimal technology range.

      PubDate: 2017-05-08T09:52:04Z
  • Evaluation of energy density measures and validation for powder bed fusion
           of polyamide
    • Abstract: Publication date: Available online 2 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): David Bourell, Jeremiah Coholich, Antoine Chalancon, Abhimanyu Bhat
      For powder bed fusion additive manufacturing, energy density captures the interrelated effects of beam power/size, scanning speed, hatch spacing and layer thickness. Relations for energy density include linear, areal and volumetric forms, developed empirically or theoretically. Various energy density formulations for laser sintering of polyamide 12 were evaluated based on correlation to measured part mass relative densities. Test pieces were printed with varying parameters: laser power, hatch spacing and layer thickness. Results show that total energy density is correlated to both and mass density and strength for a volumetric energy density.

      PubDate: 2017-05-08T09:52:04Z
  • Improvement of curved hole EDM drilling performance using suspended ball
           electrode by workpiece vibration
    • Abstract: Publication date: Available online 2 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): A. Okada, A. Yamaguchi, K. Ota
      Small-diameter curved hole EDM drilling method using a metal ball electrode suspended with flexible thin foil has been studied using zinc alloy with low melting point as workpiece material. In order to improve the drilling performance and to extend drillable hole depth for practical materials, such as aluminium alloy and steel, curved hole drilling with workpiece vibration was proposed in this study. The influences of discharge conditions and vibration amplitude on the machining characteristics were experimentally investigated. Various types of curved holes were successfully drilled in practical materials by EDM using the suspended ball electrode with workpiece vibration.

      PubDate: 2017-05-08T09:52:04Z
  • Dual arm robot in cooperation with humans for flexible assembly
    • Abstract: Publication date: Available online 2 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Sotiris Makris, Panagiota Tsarouchi, Aleksandros-Stereos Matthaiakis, Athanasios Athanasatos, Xenofon Chatzigeorgiou, Michael Stefos, Konstantinos Giavridis, Sotiris Aivaliotis
      This paper discusses a flexible assembly cell, including a dual arm robot in cooperation with humans for assembly tasks typically performed by operators. The robot performs these tasks both in isolation and cooperation with the human. Sensor data are used for programming the robot’s motion and controlling the program’s execution in a fenceless setup. Safety is ensured with the use of 3D sensing devices, while the tasks’ coordination is managed by the so-called station controller. The programming approach combines both offline and on-line methods, in an intuitive manner. The proposed assembly cell is demonstrated in an automotive industry case.

      PubDate: 2017-05-08T09:52:04Z
  • Point cloud based robot cell calibration
    • Abstract: Publication date: Available online 2 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Gergely Horváth, Gábor Erdős
      This paper presents a method to automatically calibrate an articulated robot arm using measured point cloud data. The method captures the inner structure of complex engineering objects from measured datasets. In the developed workflow first the point cloud is segmented, and then the CAD models of the objects in the work cell are recognized and fitted onto the segmented point cloud. To boost the computational efficiency of the method, parallelization was performed by applying general-purpose programming of the graphics processing unit. In this paper the calibration of a UR5 robot is carried out using measured data of a Kinect sensor.

      PubDate: 2017-05-08T09:52:04Z
  • Error correction methodology for ultra-precision three-axis milling of
           freeform optics
    • Abstract: Publication date: Available online 2 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): J.D. Owen, J.A. Shultz, T.J. Suleski, M.A. Davies
      Freeform optics facilitate a revolutionary approach to optical design. Ultra-precision diamond machining is an enabling technology for the manufacture of freeform optics. However, optical designs require tight tolerances across spatial wavelengths ranging from micro-roughness to overall form. To manufacture freeform optics to the necessary tolerances, a novel artifact-based error reduction methodology applicable to multi-axis diamond milling was developed. As demonstrated on a test sphere, the methodology reduces dominant error sources on the test sphere surface from 194 to 40nm RMS. The approach is then successfully applied to an example freeform optical design where comparable error levels are achieved.

      PubDate: 2017-05-02T09:46:15Z
  • Electrospinning and characterization of polymer–graphene powder
    • Abstract: Publication date: Available online 1 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Elisabetta Ceretti, Paola S. Ginestra, Maziar Ghazinejad, Antonio Fiorentino, Marc Madou
      In this paper the morphological, mechanical and electrical characteristics of fibers electrospun from a of poly-ε-caprolactone polymer solution with different percentages of graphene nanoplatelets mixed in are reported. The morphology of the fibers was studied under optical and scanning electron microscopes to investigate the interaction of the two phases within the fibers. The scaffolds were characterized to identify the effects of the graphene on the intrinsic properties of the material. The preparation of an optimized suspension of the graphene in the solution was found to be a fundamental factor for enhancing the applicability of the resulting fibers.

      PubDate: 2017-05-02T09:46:15Z
  • On the performance of a novel dressing tool with controlled geometry and
           density of abrasive grits
    • Abstract: Publication date: Available online 1 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Alessio Spampinato, Dragos Axinte, Paul Butler-Smith, Donka Novovic
      This paper reports on an innovative rotary dresser, characterised by abrasive features with controlled geometries and spatial arrangements. The performance of the novel dresser has been evaluated against conventional dressers (random and handset grit distributions) in terms of output forces and wear of the abrasives supported by electron scanning microscopy and metrological investigations. The proposed dresser showed improved wear resistance and significant (50%) reduction of radial forces when compared with conventional tools. This novel approach opens the possibility to vary density of abrasives to obtain uniform wear rates for complex geometry tools while allowing easy restoration of their abrasive properties.

      PubDate: 2017-05-02T09:46:15Z
  • Design method of material handling systems for lean
           automation—Integrating equipment for reducing wasted waiting time
    • Abstract: Publication date: Available online 1 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Y. Yamazaki, K. Shigematsu, S. Kato, F. Kojima, H. Onari, S. Takata
      The production systems of today are required to meet changing market conditions. To date, most conventional flexible systems depend on human flexibility. However, the demand for flexible automation systems is increasing owing to rising labor costs and quality requirements, even in emerging countries. To implement automation systems in the unpredictable market, cost reduction is essential to reduce the investment risk. However, there is no systematic design method for reducing the cost of automation systems. In this study, we propose a new design method wherein the waiting time of material handling equipment is reduced by allocating multiple operations to the equipment.

      PubDate: 2017-05-02T09:46:15Z
  • Qualification of the stream finishing process for surface modification
    • Abstract: Publication date: Available online 1 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Volker Schulze, Jens Gibmeier, Andreas Kacaras
      The stream finishing process represents an established and efficient production process for surface smoothing and edge rounding. In addition to the targeted setting of a defined surface topography the process features a high potential for mechanical surface modification that has not been realized yet. In this work the stream finishing process is carried out on normalised AISI4140 plane specimen with the aim of efficiently determining optimal processing time for surface modification (micro hardness, residual stresses, surface topography). In this context, the suitability of the Almen system [1] as an efficient method for characterizing change in residual stress during stream finishing is investigated.

      PubDate: 2017-05-02T09:46:15Z
  • Innovative grid molding and cooling using an additive and subtractive
           hybrid CNC machine tool
    • Abstract: Publication date: Available online 1 May 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Masakazu Soshi, Jonathan Ring, Christian Young, Yohei Oda, Masahiko Mori
      An innovative injection mold making and cooling approach using a hybrid additive and subtractive machine tool is proposed in this paper. Approximated mold geometry is quickly formed using prefabricated blocks. Directed Energy Deposition (DED) followed by finish milling is then used to form the continuous free-form surface of the mold cavity. The innovative technique enables quick fabrication of a mold with a conformal cooling channel resulting in a dramatic improvement in cooling performance of the mold. A mold prototype was fabricated and the performance was evaluated compared to a mold fabricated by the traditional subtractive machining method.

      PubDate: 2017-05-02T09:46:15Z
  • Incremental profile ring rolling with axial and circumferential
    • Abstract: Publication date: Available online 29 April 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Christopher Cleaver, Julian Allwood
      If profile ring rolling could be achieved without part-specific tooling, significant savings in material, energy and downstream processing could be realised. One approach, ‘incremental ring rolling’ previously suffered difficulties controlling material flow, resulting in multiple form errors. Inspired by studying an expert using a potter’s wheel, two additions to this process are proposed; the use of axial and circumferential constraints. A 12-axis ring rolling machine has been built to demonstrate these process enhancements, producing metal rings up to 1m in diameter. The production of both rectangular and L-shape rings is examined, showing significant improvements in ring cross-sectional form and circularity.

      PubDate: 2017-05-02T09:46:15Z
  • Hot stamping of high-strength aluminium alloy aircraft parts using quick
    • Abstract: Publication date: Available online 29 April 2017
      Source:CIRP Annals - Manufacturing Technology
      Author(s): Tomoyoshi Maeno, Ken-ichiro Mori, Ryosuke Yachi
      To improve the formability and productivity in conventional cold stamping of high-strength aluminium aircraft parts, a hot stamping process of heat-treatable aluminium alloy sheets using quick heating below the solution treatment temperature was developed. Quick heating just before forming has the function of producing sufficient strength increase in subsequent artificial ageing. This leads to the elimination of solution treatment and sizing processes for cold stamping. The effect of heating conditions was evaluated in hot hat-bending of A2024-T4 aluminium alloy sheets. In addition, an aluminium alloy aircraft part having high strength and dimensional accuracy was successfully produced by the present process.

      PubDate: 2017-05-02T09:46:15Z
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