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Potential of optical strain field measurement for the characterisation of the properties of resistance-spot-welded joints

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Welding and Cutting 2011年第1期10卷 48-52页

作者： Rethmeier, Michael Brauser, Stephan Weber, Gert Joining and Coating Technology Fraunhofer Institute for Production Systems and Design Technology IPK Berlin Germany Federal Institute for Materials Research and Testing BAM Berlin Germany Working Group Resistance Spot Welding in the Division Safety of Joined Components Federal Institute for Materials Research and Testing BAM Berlin Germany

For the designing of safety-relevant components particularly by means of finite element calculations, great significance is attached to the determination of local material parameters in the welding region. Conventional test methods can merely provide global parameters which, however, are frequently not sufficient precisely for the calculation of resistance-spot-welded components since these are characterised by the existence of joining zones with tight local limitations. In contrast, modern test methods such as optical strain field measurement permit the determination of the characteristic material data for concrete locations and times. In order to establish the potential of optical strain field measurements for the characterisation of the local material behaviour of spotwelded joints, tensile shear tests as well as tensile tests were carried out on resistance-spot-welded high-strength steels. The results show the high potential of this procedure not only for the quantification of the local strain behaviour in the joining region but also for the determination of local characteristic material data.

关键词： High strength steel

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Investigation on force and temperature distribution in cutting parts while micro milling with monocrystalline diamond end mills 10

Investigation on force and temperature distribution in cutti...

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10th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2010

作者： Oberschmidt, D. Uhlmann, E. Fraunhofer Institute for Production Systems and Design Technology Germany

ISBN: (纸本)9780955308284

Micro milling with cutting parts from monocrystalline diamond (MCD) is used for the manufacturing of parts with high surface quality and high precision. Objective of the presented investigations is to figure out basic data of micro milling with diamond end mills. The paper shows results of investigations to determine forces and temperatures affecting cutting parts from MCD. MCD materials are natural diamond (MND), high pressure high temperature synthetic diamond (HSD), and chemical vapour deposition diamond (MCVDD). As work piece materials german silver, copper, brass, and aluminium are used. It is detected that minimum force values are to observe at cutting speeds of about vc = 75 m min-1. Another result is that the rate of the cutting power that is effective as thermal power depends on the work piece hardness. The temperature calculation leads to the result that the surface temperature on the diamond cutting part with maximum values of S = 435°C does not reach the graphitization value. © euspen Headquarters.

关键词： Synthetic diamonds

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Compliance control with dual-arm humanoid robots: design, planning and programming

Compliance control with dual-arm humanoid robots: Design, pl...

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2010 10th IEEE-RAS International Conference on Humanoid Robots, Humanoids 2010

作者： Surdilovic, D. Yakut, Y. Nguyen, T.-M. Pham, X.B. Vick, A. Martin Martin, R. Fraunhofer Institute for Production Systems and Design Technology IPK-Berlin Department Automation and Robotics Pascalstr. 8-9 10587 Berlin Germany

ISBN: (纸本)9781424486885

A widespread application of impedance control in dual-arm robotic systems is still a challenging problem. One of limitations is the absence of a widely-accepted framework for the synthesis of the impedance control parameters that ensure stability of both contact transition and interaction processes and guarantee desired contact performance. The next critical problem relates planning and programming of complex impedance controlled bimanual operations. The proposed new design, planning and programming framework provides efficient and flexible algorithms and tools which considerably facilitate future dual-arm robot applications in complex assembly tasks. The initial testing with new Workerbot dual-arm system demonstrates applicability and feasibility of the proposed framework. ©2010 IEEE.

关键词： Compliance control

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PISA: Next Generation of Flexible Assembly systems - From Initial Ideas to Industrial Prototypes

PISA: Next Generation of Flexible Assembly Systems - From In...

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Joint international symposium on robotics

作者： Joerg Krueger Volker Katschinski Dragoljub Surdilovic Gerhard Schreck Fraunhofer Institute for Production Systems and Design Technology (IPK)

ISBN: (纸本)9783800732739

关键词： Prototypes Assembly Safety Planning Service robots Robot kinematics

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Flexible Assembly systems through Workplace-Sharing and Time-Sharing Human-Machine Cooperation (PISA)

Flexible Assembly Systems through Workplace-Sharing and Time...

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Joint international symposium on robotics

作者： Joerg Krueger Volker Katschinski Dragoljub Surdilovic Gerhard Schreck Fraunhofer Institute for Production Systems and Design Technology (IPK)

ISBN: (纸本)9783800732739

In September 2006 an integrated European project (IP) was launched entitled "Flexible Assembly systems through Workplace-Sharing and Time-Sharing Human-Machine Cooperation (PISA)". The general aim of the project is to develop intelligent assist systems (IAS) in order to support the human worker instead of replace him. The project comprises nine interrelated subprojects and has an overall duration of 48 months. It involves four large companies, seven SMEs, and seven research institutes from seven European countries. One breakthrough of this project is to fill the gap between manual and automated assembly by introducing novel IAS technology and providing planning and integration tools to make this new technology applicable. A second breakthrough is to achieve the reconfigurability of assembly systems and the reusability of assembly equipment. On the one hand, this is related to a modular structure of assembly systems, including standard hardware- and software-interfaces of assembly equipment. On the other hand, methods and tools are needed for reconfiguration planning, re-programming, life-cycle and equipment management, and knowledge bases for assembly solutions. The aim of the project is their prototypical development, including demonstrations based on industrial use-cases. The main technological developments have been performed during the first 36 month of the project. This means prototype systems are already available, and will be further adapted to demonstrators for industrial use-cases in the last year of the project.

关键词： Assembly Humans Planning Assembly systems Service robots Artificial intelligence

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Quality Evaluation of Image Recording Strategies for Limited Angle Tomography

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Tsinghua Science and technology 2010年第1期15卷 25-29页

作者： Fabian Stopp Christian Winne Emanuel Jank Erwin Keeve Department of Maxillofacial Surgery and Clinical Navigation Charité-Universittsmedizin Berlin13353 BerlinGermany Fraunhofer Institute for Production Systems and Design Technology 10587 BerlinGermany

In this paper we propose a new method for evaluating image recording strategies for limited angle tomography. In limited angle tomography exact three-dimensional （3-D） reconstruction is not achievable. With this method a metric for the reachable reconstruction quality by defined X-ray source trajectories is calculated. The result of our method is independent of reconstruction algorithms. Our approach is based on the gradients of the scanned volume and their grade of determinability. Compared to simulated reconstruction accuracy with simultaneous algebraic reconstruction techniques, the method of evaluation shows the same dependencies on X-ray source trajectories. By using the proposed method different source trajectories for a limited angle range are comparable with respect to the reachable reconstruction quality.

关键词： 3-D reconstruction quality intraoperative imaging limited angle tomography X-ray source trajectories

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Investigating the learnability of immersive free-hand sketching

Investigating the learnability of immersive free-hand sketch...

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7th ACM SIGGRAPH Eurographics Symposium on Sketch-Based Interfaces and Modeling, SBM 2010

作者： Wiese, E. Israel, J.H. Meyer, A. Bongartz, S. Department Psychology Neuro-Cognitive Psychology Unit LMU Munich Germany Fraunhofer Institute for Production Systems and Design Technology IPK Berlin Germany Center of Human-Machine-Systems Berlin University of Technology Germany

ISBN: (纸本)9783905674255

Immersive modeling systems which allow for sketching and constructing three-dimensional product models receive growing interest from both academic research and industry [DBWB*00;FASM02;IWMS09;KAMD*08;KAML*01]. The potential of such systems is estimated in the possibility to create models in a one-to-one scale, to interact with product models and to reduce breaks between analogue and digital media during the development process [DBWB*00;IWMS09]. Despite the growing interest in 3D-sketching techniques, little is known so far about the ability of designers to create free-hand drawings in three-dimensional space. In particular, only few studies have investigated cognitive and sensorimotor processes during immersive sketching yet. This paper contributes to the research on immersive sketching by investigating the learnability of free-hand sketching in an experimental setting. In a study among 25 students, participants repeatedly sketched primitive shapes (circles, squares, balls, and cubes). Sketching performance was operationalized by the time needed to complete a sketch, the quality of the sketch, and the subjective mental workload of the designers. Results suggest a significant enhancement of sketching quality over time, but no change in the time needed to complete a sketch. © The Eurographics Association 2010.

关键词： Digital storage

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Investigating the learnability of immersive free-hand sketching 10

Investigating the learnability of immersive free-hand sketch...

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Proceedings of the Seventh Sketch-Based Interfaces and Modeling Symposium

作者： E. Wiese J. H. Israel A. Meyer S. Bongartz Neuro-Cognitive Psychology Unit LMU Munich Fraunhofer Institute for Production Systems and Design Technology IPK Berlin Fraunhofer Institute for Production Systems and Design Technology IPK Berlin and Berlin University of Technology Berlin University of Technology

ISBN: (纸本)9783905674255

Immersive modeling systems which allow for sketching and constructing three-dimensional product models receive growing interest from both academic research and industry [DBWB*00; FASM02; IWMS09; KAMD*08; KAML*01]. The potential of such systems is estimated in the possibility to create models in a one-to-one scale, to interact with product models and to reduce breaks between analogue and digital media during the development process [DBWB*00; IWMS09]. Despite the growing interest in 3D-sketching techniques, little is known so far about the ability of designers to create free-hand drawings in three-dimensional space. In particular, only few studies have investigated cognitive and sensorimotor processes during immersive sketching *** paper contributes to the research on immersive sketching by investigating the learnability of free-hand sketching in an experimental setting. In a study among 25 students, participants repeatedly sketched primitive shapes (circles, squares, balls, and cubes). Sketching performance was operationalized by the time needed to complete a sketch, the quality of the sketch, and the subjective mental workload of the designers. Results suggest a significant enhancement of sketching quality over time, but no change in the time needed to complete a sketch.

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Application of PCD and boron doped CVD-diamond tool electrodes in micro EDM 10

Application of PCD and boron doped CVD-diamond tool electrod...

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10th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2010

作者： Uhlmann, E. Röhner, M. Domingos, D.C. Fraunhofer Institute for Production Systems and Design Technology Germany Institute for Machine Tools and Factory Management Technische Universität Berlin Germany

ISBN: (纸本)9780955308284

Micro-Electrical Discharge Machining (μ-EDM) is based on the modification of state of the art process technologies and universal machine tools applied for electrical discharge machining operations [1, 2]. Experimental investigations aim on decreasing the wear of tool electrodes using novel electrode materials like boron doped CVDdiamond (B-CVD) and polycrystalline Diamond with cobalt as bonding material (PCD). © euspen Headquarters.

关键词： Machine tools

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Compliance control with dual-arm humanoid robots: design, planning and programming

Compliance control with dual-arm humanoid robots: Design, pl...

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IEEE-RAS International Conference on Humanoid Robots

作者： D. Surdilovic Y. Yakut T-M. Nguyen X. B. Pham A. Vick R. Martin-Martin Department Automation and Robotics Fraunhofer Institute for Production Systems and Design Technology IPK-Berlin Berlin Germany Fraunhofer Institute for Production Systems and Design Technology IPK-Berlin Department Automation and Robotics Pascalstr. 8-9 10587 Germany

关键词： Impedance Robot kinematics Service robots Assembly Force Planning

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