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19th CIRP Design Conference: Competitive Design

作者： Weidlich, D. Zickner, H. Riedel, T. Böhm, A. Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Strasse 70 D-09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz Reichenhainer Strasse 88 D-09126 Chemnitz Germany

ISBN: (纸本)9780955743641

A consistent and accurate digital data model takes a major role during the whole product life cycle of production facilities. This article introduces both technologies: 3D laser scanning for acquisition of 3D geometry date and motion capturing for real motion data with focus on the application in the product life cycle of production facilities. It gives an overview and comparison of different hard- And software solutions. Workflows for concrete tasks in the planning process show how both technologies can be combined and how the acquired data needs to be handled for the integration with CAD tools or Virtual Reality systems. Finally this article gives an outlook on the possible future development of these technologies. © Cranfield University 2009.

关键词： Virtual reality

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Detection of Counterfeit by the Usage of Product Inherent Features

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Procedia CIRP 2015年 26卷 430-435页

作者： Matthias Blankenburg Christian Horn Jörg Krüger Fraunhofer-Institute for Production Systems and Design Technology Pascalstr. 8-9 D-10587 Berlin Germany Technische Universität Berlin Institute for Machine Tools and Factory Managment Pascalstr. 8-9 D-10587 Berlin Germany

One aspect of the economical dimension of sustainable business development is the protection of high value products from counterfeiting. This holds especially true for consumer goods since the sustainable manufacturing process gains a more and more important role, e.g. in the creation of a brand image. In this paper we propose a method for detecting counterfeit by capture of inherent features indissolubly linked with the product induced by the production process itself. Since a counterfeiter gains margin by the use of inferior production processes and material the differences between genuine product and counterfeit can be captured in an automated fashion. The proposed method not only renders the application of artificial security tags obsolete which helps reducing the material usage but also gives enhanced protection against counterfeiting as the inherent characteristics cannot be removed from the article.

关键词： Counterfeit Detection Pattern Recognition machine Learning 2D and 3D Image Processing Electronic Nose

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Fabrication Method for Series Production of Sheet Metal Parts with Integrated Piezoelectric Transducers

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Procedia technology 2014年 15卷 494-502页

作者： Matthias Nestler Welf-Guntram Drossel Sebastian Hensel Roland Müller Fraunhofer Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany

The paper presents a high volume compatible production method for the fabrication of sheet metal parts with integrated piezoelectric transducers. The functionality of the integrated piezomodule is shown on a wing assembly, consisting of two sheet metals shaped with roll bending and three point bending operations. The stimulation of the structure is performed with a shaker, the reduction of the acoustic noise was realized with the integrated piezomodule and monitored with vibrometer measurements. Impedance measurements were performed for health monitoring of the multiple bolted joint. Furthermore, a simulation of the structure was used for the determination of resonance frequencies. The results show a good correlation between experiment and simulation.

关键词： piezo-metal-compound adhesive MFC piecoelectic transducer vibration compensation health monitoring

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Analysis of strategies for gap control in jet electrochemical machining 14

Analysis of strategies for gap control in jet electrochemica...

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14th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2014

作者： Hackert-Oschätzchen, Matthias Martin, André Meichsner, Gunnar Schubert, Andreas Faculty of Mechanical Engineering Technische Universität Chemnitz Chemnitz09107 Germany Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz09126 Germany

ISBN: (纸本)9780956679031

Electrochemical Machining (ECM) is a promising micro-production technique for the creation of complex and highly accurate three-dimensional geometries in electrically conductive materials. As the electrochemical dissolution behavior is independent from the material's mechanical characteristics like hardness and ductility, ECM is an alternative processing technique to create micro-structures even in mechanically hard to machine alloys. The basic principle of ECM is the anodic dissolution of work piece material by electric charge transport. As a special procedure electrochemical machining with continuous electrolytic free jet (Jet-ECM) offers the possibility to machine work pieces at extremely high current densities up to 1000 A/cm2 [1,2]. In Jet-ECM the electrolyte is pumped continuously through a micro nozzle and ejected with an average speed of approximately 20 m/s perpendicularly to the work piece surface. Thus, a free jet is formed on the surrounding atmospheric air, which leads to a high localization of the current density and therefore to a highly localized machining area around the impinging jet. From the previous work on Jet-ECM the working gap was detected as a significant process variable, which needs an adequate control or adjustment. In this study, an analysis of potential strategies to control this variable is summarized.

关键词： Electrolytes

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Integrated Sensors System for Human Safety during Cooperating with Industrial Robots for Handing-over and Assembling Tasks

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Procedia CIRP 2014年 23卷 65-70页

作者： Mohamad Bdiwi Department of Joinging and Assembling Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany

Human safety is the main concern which prevents performing some tasks requiring physical interaction between human and robot. Therefore, the safety concept was previously based on eliminating contact between human and robots. This paper will propose a robot system which integrates different types of sensors to ensure human safety during the physical human robot interaction. The implemented sensors are vision, force and sensitive skin. Using vision system, the robot will be able to detect and recognize human face, loadfree human hand and any object carried by human hand (active hand). Furthermore, it will help the robot to define in which directions the force should be applied and what are the dangerous directions for human safety. The force sensor will help the robot to react to the motion of the human hand during the handing-over or assembling task. The sensitive skin will prevent any collision between the human and the robot arm. The proposed system is supported with a voice system for informing human about the actual status of the system.

关键词： Human-robot interaction Human-safety visual servoing force control handing-over and assembly tasks

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On the development of an intrinsic hybrid composite

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IOP Conference Series: Materials Science and Engineering 2016年第1期118卷

作者： R Kießling J Ihlemann M Riemer W-G Drossel I Scharf T Lampke S Sharafiev M Pouya M F-X Wagner Professorship of Solid Mechanics Faculty of Mechanical Engineering Technische Universität Chemnitz D-09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology D-09126 Chemnitz Germany Professorship of Materials and Surface Engineering Institute of Materials Science and Engineering Technische Universität Chemnitz D-09125 Chemnitz Germany Chair of Materials Science Institute of Materials Science and Engineering Technische Universität Chemnitz D-09125 Chemnitz Germany

Hybrid parts, which combine low weight with high strength, are moving into the focus of the automotive industry, due to their high potential for usage in the field of crash-relevant structures. In this contribution, the development of an intrinsic hybrid composite is presented, with a focus on the manufacturing process, complex simulations of the material behaviour and material testing. The hybrid composite is made up of a continuous fibre- reinforced plastic (FRP), in which a metallic insert is integrated. The mechanical behaviour of the individual components is characterised. For material modelling, an approach is pointed out that enables modelling at large strains by directly connected rheological elements. The connection between the FRP and the metallic insert is realised by a combination of form fit and adhesive bonds. On the one hand, adhesive bonds are generated within a sol gel process. On the other hand, local form elements of the metallic insert are pressed into the FRP. We show how these form elements are generated during the macroscopic forming process. In addition, the applied sol gel process is explained. Finally, we consider design concepts for a specimen type for high strain testing of the resulting interfaces.

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Electromagnetic Joining of Hybrid Tubes for Hydroforming

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Procedia CIRP 2014年 23卷 1-6页

作者： Verena Psyk Thomas Lieber Petr Kurka Welf-Guntram Drossel Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Strasse 88 09126 Chemnitz Germany

Joining of functionally adapted and weight-optimized semi-finished parts by electromagnetic compression is investigated taking into account that the resulting component is further processed by hydroforming. For this purpose both ends of an aluminum tube are connected to steel tubes. During the subsequent hydroforming of the hybrid tube the joints are exposed to extreme loading. Finite-Element-Simulation is applied for characterizing and quantifying these loads. The electromagnetic joining process is analyzed, the joints are characterized by microstructural analysis and the resulting properties of the joint are evaluated by model experiments.

关键词： Electromagnetic forming joining hydroforming

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Tempered forming of Magnesium Alloys Using the Example of Roll forming

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Materials Today: Proceedings 2015年 2卷 S60-S66页

作者： K. Richter R. Haase F. Schieck D. Landgrebe Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany

The sheet metal forming of magnesium alloys requires an adaption of the forming processes utilized. Due to limited formability at room temperature, heating above a temperature of 200 to 225 °C is necessary in order to activate additional gliding planes. By the example of roll forming, the temperature regime and implementation of heating equipment into the forming process is illustrated. On account of the progressive feed of sheet material necessary for roll forming, a transverse flux induction heating was used in the experimental setup. Results of experimental design and experimentation with AZ31 alloy will be presented in this paper.

关键词： Magnesium Alloys AZ31 Roll forming Inductive Heating

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Graphical Visualization of Sustainable Manufacturing Aspects for Knowledge Transfer to Public Audience

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Procedia CIRP 2015年 26卷 58-63页

作者： Wei Min Wang Lars Wolter Kai Lindow Rainer Stark Department for Machine Tools and Factory Management Technische Universität Berlin Pascalstr. 8-9 10587 Berlin Germany Department forVirtual Product Creation Fraunhofer-Institute for Production Systems and Design Technology Pascalstr. 8-9 10587 Berlin Germany

Sustainability is characterized by complex interplay between economic, environmental and social aspects and a temporal dimension. The public perception is often mistakenly limited to single aspects due to deliberated influence by marketing or misuse. Reliable scientific articles usually address expert audience only. To create a broad public understanding knowledge has to be available and comprehensible. In the World Wide Web various concepts are applied to represent knowledge each utilizing different sets of media without interactive elements. To get an overall picture of sustainability an understanding of complex relationships is necessary. Non-interactive text based approaches lack the necessary capabilities to present this picture. This paper presents a graphical approach involving a simplified product configurator based on an ontology developed in the CRC1026. It embodies gamification elements to draw people's attention and uses ontological trees to illustrate relationships.

关键词： Sustainability Knowledge transfer to public audience Ontology Gamification

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Goal-oriented Life Cycle Investigations for Composite Manufacturing Chains

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Procedia CIRP 2015年 29卷 438-443页

作者： F. Lindner R. Schmitt Department of Production Quality and Metrology Fraunhofer Institute for Production Technology IPT Steinbachstraße 17 Aachen 52074 Germany Department of Metrology and Quality Management at Laboratory for Machine Tools and Production Engineering (WZL) RWTH Aachen University Steinbachstraße 19 Aachen 52074 Germany

Holistic Life Cycle Investigations for products and the related manufacturing chains require large efforts. The pre-quantification of sensitivities for process inputs underscores their importance for the results and determines the required grade of accuracy for quantification. Those indicators support an expedient construction of process models for the LCA/LCC application. Furthermore, a pre-analysis of the differences between product systems for comparative investigations support an adequate and tailored setting of system boundaries. The approach for those goal-oriented Life Cycle Investigations is applied in a Use Case describing a manufacturing chain of automotive structural parts made of composites with a focus on environmental impacts. The results of the pre-analysis are used for recommendations and rules for an expedient development of LCA models and later investigations.

关键词： Life Cycle Assessment Life Cycle Costing Laser-assisted tape laying Themoforming Fiber-reinforced plastics ecological pre-investigation Automotive application

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