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6019 |
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Wednesday, May 22, 2019, Saal Brüssel 2:20 PM Diffusion brazing and bonding |
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Development of diffusion bonded large scale parts for highly stressed tool applications |
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Jan Pfeiffer* / PVA Löt-und Werkstofftechnik GmbH, Germany Felix Gemse / Guenter-Koehler-Institut fuer Fuegetechnik und Werkstoffpruefung GmbH (ifw Jena), , Germany Vanessa Frettlöh/ gemeinnuetzige KIMW Forschungs-GmbH, Germany Denny Günther/ FKT Formenbau und Kunststofftechnik GmbH, Germany Udo Broich/ PVA Industrial Vacuum Systems GmbH, Germany Simon Jahn/ Guenter-Koehler-Institut fuer Fuegetechnik und Werkstoffpruefung GmbH (ifw Jena), , Germany Udo Hinzpeter/ gemeinnuetzige KIMW Forschungs-GmbH, Germany Udo Staps/ FKT Formenbau und Kunststofftechnik GmbH, Germany |
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Due to rising demands on the quality of injection molded parts, it becomes more and more important to specifically influence the thermal behavior of the tools (e.g. by variothermal tempering). Based on this fact the geometry of heat-control channels gets very complex, leading to a change in the manufacturing strategy of large scale tools combining a layered structure and joining. Even though smaller parts can be joined by brazing, diffusion bonding emerges as the promising method for large scale, highly stressed parts as molds or distribution systems. However, in order to apply diffusion bonding for such applications, it is necessary to understand the major influences and up-scaling effects. In the present paper, first results of a collaborative research, supported by the German Federal Ministry of Economic Affairs and Energy (BMWi), between joining and tooling institutes and companies will be shown. The aim of this work is to use the knowledge concerning process-relevant influences for deriving a suitable diffusion bonding related manufacturing chain. Using numerical simulations to design the channels and tools and to analyze the thermal and mechanical behavior of the parts during bonding is one scope in the project and should help to evolve a diffusion bonding friendly design and corresponding processing of the tools. The data will be used to build up a tooling design framework, which can be utilized for several new developments without long-term fundamental research. A validation and data gathering will be carried out by means of bonding samples up to large sizes with varying design and manufacturing history, generating broad experimental data for up-scaling tasks. Mechanical properties as well as microstructural changes will be analyzed and set into relation with the simulations and applicatory requirements. |