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检索条件"机构=Fraunhofer-Institute for Machine Tools and Forming Technology IWU"

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Improvement of micro-cutting accuracy by in-process application of 3d-sensors 7

Improvement of micro-cutting accuracy by in-process applicat...

引用

7th International Conference European Society for Precision Engineering and Nanotechnology, EUSPEN 2007

作者： Schubert, A. Eckert, U. Schulz, B. Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz Germany

ISBN: (纸本)0955308224

The German BMBF-supported joint project "3D-Mikro" [1] aims to the integration of 3D-coordinate measurement equipment into highest precision machine tools. By inprocess measuring of tool geometries and workpiece structures the uncertainties resulting from multiple clamping should be eliminated or at least diminished. The main focus of the research activities at fraunhofer iwu is the investigation and adaptation of suitable non-contact working sensors for pre-measuring of the microcutting tool and the micro-workpiece. In this article some selected results of the running test program are shown.

关键词： Software testing

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Process chains for the production of micro-structured functional surfaces in plastics and metals 7

Process chains for the production of micro-structured functi...

引用

7th International Conference European Society for Precision Engineering and Nanotechnology, EUSPEN 2007

作者： Schubert, A. Burkhardt, T. Schneider, J. Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz Germany

ISBN: (纸本)0955308224

The functionalization of technical surfaces by microstructuring opens a variety of interesting possibilities, i.e. the generation of stain-resistant surfaces, the specific modification of the tribology of sheet metal or biomechanical optimized implant surfaces. While research in the physical and technological fundamentals of the effects has progressed already far, the realization of suitable production technologies and equipment for the commercial fabrication requires new innovative solutions. Not only plastics but increasingly also high-strength materials such as steel or titanium have to be microstructured economical and process sure. Therefore, process chains for the replication of functional structures especially by embossing or rolling techniques including the necessary equipment technology and tool manufacturing are developed at the fraunhofer iwu. The functionalization of prototype surfaces by chipping complete the field of activity. © euspen Headquarters.

关键词： Sheet metal

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Electrochemical machining of carbide metal micro tools 7

Electrochemical machining of carbide metal micro tools

引用

7th International Conference European Society for Precision Engineering and Nanotechnology, EUSPEN 2007

作者： Hackert, M. Meichsner, G. Schubert, A. Faculty of Mechanical Engineering TU Chemnitz Chemnitz09112 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz09126 Germany

ISBN: (纸本)0955308224

Mechanical Machining of carbide metals is critical, as these materials belong to the hardest substances known. Electrochemical Machining (ECM) is presented as an alternative to conventional processing. This technique dissolves conductive materials by anodic dissolution in neutral solutions at extremely high current densities of about 100 A/cm. This is independent from the hardness of the work piece and should therefore be favourable to structuring carbide metals. For the reason of carbide metal alloys being composites of extremely hard particles embedded in a softer matrix, ECM of these materials is complex due to the nonhomogenous structure as the components dissolve and passivate differently. The paper starts with results of modifying conventional micro tools made of tungsten carbide. In the second part the potential of working with a free electrolyte jet (EJM) is investigated.

关键词： Metals

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NEW ASPECTS OF TOOL MATERIALS AND COATING IN SHEET METAL CUTTING TECHNOLOGIES

NEW ASPECTS OF TOOL MATERIALS AND COATING IN SHEET METAL CUT...

引用

INternational Conference on Product Design and Manufacturing Systems(2007年产品设计与制造系统国际会议)

作者： Reimund Neugebauer Verena Kr(a)usel Patricia Weigel Hans Br(a)unlich Fraunhofer Institute for Machine Tools and Forming Technology IWU ChemnitzGermany

The use of joinable formed sheet parts made of high-strength and high-tensile materials requires specifically adapted catting technologies to guarantee the requirements for dimensional *** cutting technology used,together with the tool and the machine,determine the parameters of the final part,depending on the geometry to be cut and the semi-finished products selected,although the interaction of the workpiece/tribology 、tool system is *** is therefore necessary to modify the tool design for cutting tools in shearing and precision cutting processes and to select appropriate tool materials of steel and ceramics whilst ensuring that the coatings used are sufficiently durable.

关键词： Cutting High-Strength Steel Tool Coatings Ceramics Carbide

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Methods for a Multisensorsystem for In-line Process- and Quality Monitoring of Welding Seams using Fuzzy Pattern Recognition

Methods for a Multisensorsystem for In-line Process- and Qua...

引用

12th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA 2007), vol.2

作者： Michael Kuhl Reimund Neugebauer Paul-Michael Mickel Fraunhofer Institute of Machine Tools and Forming Technology Chemnitz Germany Volkswagen Sachsen GmbH Zwickau Germany

Due to many advantages such as low heat input and high welding speed, laser-welding technology is increasingly used for manufacturing. It is important for the user of laser welding technologies to optimally use the plant capacities, to ensure high availability, and to avoid downtimes, rejections and rectifications of rejects. In order to solve the respective problems, the fraunhofer institute for machine tools and forming technology, in cooperation with Volkswagen Sachsen AG and other partners, is developing a multi-sensor system for in-line process monitoring based upon fuzzy pattern recognition.

关键词： Monitoring Welding Pattern recognition Sensor phenomena and characterization Surface emitting lasers Infrared detectors Intelligent sensors Filters Chemical technology Acoustic sensors

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Demands on tool and machine design for temperature supported hydroforming of magnesium and aluminum alloys

Demands on tool and machine design for temperature supported...

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Commercial Vehicle Engineering Congress and Exhibition

作者： Neugebauer, Reimund Seifert, Michael Kurka, Petr Sterzing, Andreas Fraunhofer Institute for Machine Tools and Forming Technology IWU

Due to the need for a significant reduction in the weight of parts in automotive manufacturing, the use of lightweight materials such as magnesium and aluminium is becoming increasingly important. Unfortunately, these materials are often associated with limited cold formability. Because of this, production of large, complex sheet metal components using forming technology frequently entails greater cost. To extend the application of these materials in manufacturing processes, it is essential to identify strategies which permit improvement of the forming behaviour of these materials. The use of elevated temperatures as a process parameter in forming operations is a strategy which has potential in terms of the search for a solution to counter the aforementioned disadvantages. Firstly, it permits a distinct increase in the ductility and formability of the material. Secondly, it reduces deformation resistance and hence the forming forces and pressures required. Copyright © 2006 SAE International.

关键词： machine design

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High temperature micro forming of inorganic glass - An effective replication method 6

High temperature micro forming of inorganic glass - An effec...

引用

6th International Conference European Society for Precision Engineering and Nanotechnology, EUSPEN 2006

作者： Schubert, Andreas Edelmann, Jan Burkhardt, Thomas Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany

ISBN: (纸本)0955308208

Glass is a commonly used material in the MEMS technology. Applications range from usage in the optical data transmission, MOEMS, applications in the micro-fluid analysis and bioengineering, packaging for housing and as insulating substrate for bonding. Functional structures are mostly applied in array arrangements on the glass wafer following other wafer level processes of the micro system technology. Among the numerous possibilities to structure glass at the surface, high temperature micro forming is one of the economically most favourable processes [1] [2], in particular for the manufacturing of higher quantities with high surface quality. With this technology it is possible to mould functional structures directly into bondable borosilicate glass. Former research results from within this research group on structuring of fluoride glasses [3] had shown the possibility of micro-structuring the material glass by moulding. After improving the equipment technology with respect to achievable forming temperatures up to 800°C, isothermal tempering and accurate controlling of the load transmission, the possibility to microstructure glass wafers of Pyrex®7740 and other borosilicate glasses is proven within a suitable process window.

关键词： Borosilicate glass

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Modular system concept for ultra-precision assembly 6

Modular system concept for ultra-precision assembly

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6th International Conference European Society for Precision Engineering and Nanotechnology, EUSPEN 2006

作者： Schubert, A. Schulz, B. Freitag, H. Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany Xenon Automatisierungstechnik GmbH Dresden Germany

ISBN: (纸本)0955308208

This article describes the successful implementation of a modular system concept for ultra precision assembly tasks by means of the accurate alignment of light emitting and receiving modules in front of buried waveguides in optical circuit boards. The constitutive result of a Saxon research project FGM [1] is a modular designed assembling system, that enables vertical fine positioning and gripper integrated angle adjustment in opposition to conventional Surface Mount technology. Today these sensitive components are mounted and adjusted predominantly manually under special laboratory conditions. The technical challenge is to develop new methods and assembling components for high-precision and reproducible packaging in an automated assembling process. This is an important step to reduce the fabrication costs drastically and to smooth the way from a pure laboratory method to an industrial solution concept.

关键词： Surface mount technology

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Making of state space formulations of dynamic systems

Making of state space formulations of dynamic systems

引用

作者： Neugebauer, R. Knüpfer, H. Illgen, A. Kranz, B. Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Str. 88 09126 Chemnitz Germany

ISBN: (纸本)9783902661173

Complex dynamic systems can be simulated using ANSYS®(ANSYS, Inc., Canonsburg, PA, USA) but for controller design Simulink®(MathWorks, Inc., Natick, MA, USA) is the appropriate software tool. The MATLAB®(MathWorks, Inc., Natick, MA, USA) program makeStateSpace, which is introduced in this paper, transfers the results of ANSYS modal analysis into a modal state space formulation that can then be included in Simulink. A model order reduction to diminish the system size is also possible. Hence, with the help of makeStateSpace the advantages of both powerful software tools ANSYS and Simulink can be used for controller design.

关键词： Simulink

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Quality and Process Control of Nd: YAG - Laser Welding Using fuzzy Pattern Recognition Techniques for Multisensor Systems

Quality and Process Control of Nd: YAG - Laser Welding Using...

引用

International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Michael Kuhl Reimund Neugebauer Fraunhofer Institute of Machine Tools and Forming Technology Chemnitz Germany

Quality monitoring is necessary for a stable manufacturing, especially in the case of laser welding processes. During the project a system was developed which allows the analysis of in process data by fuzzy pattern recognition methods. This resulted in improved prediction of seam irregularities as compared with conventional methods. The work was carried out in the framework of the MAINE cooperative project funded by the Free State of Saxony.

关键词： Process control Neodymium Welding Fuzzy control Fuzzy systems Pattern recognition Multisensor systems Monitoring Manufacturing processes Laser stability

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