Reduction of Sintering Distortion in Metal Binder Jetting – A Tribological Approach
摘要
Additive manufacturing technologies enable the resource-efficient production of highly complex components made of plastic and metal. One emerging manufacturing technology is the metal binder jetting process, which enables a more detailed and cost-effective production of metal additive components compared to the established laser powder bed fusion process. At the end of the metal binder jetting process chain, a sintering step takes place in which the components obtain their final shape. During this step, a shrinkage of approx. 20% occurs. The relative movement between the component and the setter plate during shrinkage leads to stresses within the component due to frictional forces and results in unwanted deformation. To handle this problem, various approaches are currently being used and investigated, such as simulation of the sintering process and automated pre-deformation of the component derived from this, or its iterative manufacturing and manual adjustment. In this perspective paper, however, we take another approach. If the component located on the setter plate and placed in the furnace is considered as a tribological system, specific design measures can be developed in order to reduce friction and thus the component distortion. These measures are systematically derived in this paper from the individual elements of this tribological system, which are, in particular, the component, the intermediate, the setter plate and the environment. General measures to reduce friction already known from the literature are also included and discussed.