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2071 |
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Tuesday, May 04, 2010, Moor Room 11:40 AM Industrial Engineering |
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Functional wear resistant tool surfaces for novel friction spinning forming process to manufacture parts with graded thermo mechanical properties |
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Ingor Theodor Baumann* / University of Dortmund, Germany Wolfgang Tillmann / Technische Universität Dortmund / Institute of Materials Engineering, Germany Evelina Vogli/ Technische Universität Dortmund / Institute of Materials Engineering, Germany Fabian Hoffmann/ Technische Universität Dortmund / Institute of Materials Engineering, Germany Werner Homberg/ University of Paderborn / Lehrstuhl für Umformende und Spanende Fertigungstechnik, Germany Charlotte Beerwald/ University of Paderborn / Lehrstuhl für Umformende und Spanende Fertigungstechnik, Germany Daniel Hornjak/ University of Paderborn / Lehrstuhl für Umformende und Spanende Fertigungstechnik, Germany |
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In recent years, the demands on lightweight constructions with respect to their functional abilities and their potential to save recourses by reducing the weight have increased significantly. Tailor-made components with functionally graded thermo-mechanical properties manufactured by novel friction-spinning forming technique are a new approach to meet these demands. This forming technique combines process elements of the spinning and the friction welding and allows to extend the forming limits of the workpiece material in order to produce multifunctional components with locally varying properties. However, during the friction-spinning process, strong mechanical forces, high temperatures and intensive friction impose high tribological demands on the tools and finally lead to an increase of wear. In this study, surface engineering techniques such as Thermal Spraying and PVD have been utilized to apply coatings on tools for the friction-spinning with the aim to reduce wear and to optimize the forming process. For this purpose, thermally sprayed carbide based and ceramic coatings have been investigated. In addition the thermally sprayed coatings have been combined with a wear resistant PVD top layer to use the advantages of both coating techniques. Examinations regarding the wear behavior of the coatings and their influence on the friction-spinning process have been made. |