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6272 |
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Wednesday, May 05, 2021, Hall 1 9:00 AM Opening |
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Recent developments in additive manufacturing of metallic materials |
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Simon Jahn* / Günter-Köhler-Institut für Fügetechnik und Werkstoffprüfung, Germany Sebastian Matthes / Günter-Köhler-Institut für Fügetechnik Werkstoffprüfung GmbH, Germany Felix Gemse/ Günter-Köhler-Institut für Fügetechnik Werkstoffprüfung GmbH, Germany |
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Whereas in the past, powder bed fusion processes were the main focus of development and application, two other process groups have gained in importance in recent years: Powder metallurgy based and build-up welding / cladding processes. In powder metallurgy-based processes, the process steps debinding and sintering are carried out after shaping / 3D-printing. The shaping itself can be carried out in a variety of ways. The process categories binder jetting and material extrusion are currently the most important. Binder jetting because of productivity, which is claimed to be 100times higher compared to powder bed fusion with a single laser system. Material extrusion due to the low investment costs for the printer , starting in the range of few hundred Euros. After getting the shape, the parts have to be treated thermally at least to get the properties of metals. The debinding procedure depends on the used binder system. Besides thermal debinding, the necessary step can be done by catalytic or solvent debinding as well. The whole process chain can be compared to metal injection molding. But instead of machining a mold for several thousand parts, each printed part can be designed slightly different. The build-up welding processes have lower accuracies, but can be used to produce components weighing several hundred kilograms. For large water cooled casings or housings the welding procedure can be an alternative compared to the used brazing used today. The presentation gives an overview of the commercially available processes and systems as well as an outlook on the processes currently in development phase |