Development of appropriate processes and cutting tools for precision machining of Co-Cr-Mo superalloys to increase the safety of medical implants

特别是，在医疗植入物的加工中，为了避免组件的过早失效和表面侵蚀，确保明确的表面纹理和小变形边界层是很重要的。这可以通过优化的切割工艺来实现。正如钴铬钼制成的髋臼粗加工的准备工作所示，人工髋臼的精加工现在将在这个高级研究项目中进行检查。此外，应该通过使用有限元模拟加工来最小化实验测试的工作量。由于Co-Cr-Mo材料的这些材料模型目前还不可用，因此开发这些模型是本研究项目的关键目标。这将在材料科学与连接技术研究所的密切合作下实现。在这个项目中，一个精加工过程将与一个明确的前沿发展。目标是通过车削和旋转铣削产生Ra = 0.1微米的表面粗糙度。一种创新的方法是切割材料的微结构，如PCD， CVD-D， MKD和CBN。这也适用于工艺引起的材料力学性能的改变，例如Co-Cr-Mo合金的亚表面区域中epsylon相的特定调整比例。为了达到适当的表面粗糙度和减小切削力，对旋转铣削工艺进行了规划。

Especially, in the processing of medical implants, it is important to ensure defined surface textures and small deformed boundary layers in order to avoid premature failure of the component and superficial erosion. This can be achieved by an optimized cutting process. As shown in the preparatory work for roughing the hip ball made of cobalt-chromium-molybdenum, the finishing of the artificial acetabulum is now to be examined in this advanced research projects. In addition, the experimental test effort should be minimizedby the use of FE-simulations of machining. Since these material models for the material Co-Cr-Mo are currently not available, the development these models is a key objective of this research project. This will be realized in close cooperation with the Institute of Materials Science and Joining Technology. In this project a finishing process will be developed with a defined cutting edge. The aim is to produce a surface roughness of Ra = 0.1 microns by turning and rotary milling. An innovative approach is the microstructuring of cutting materials such as PCD, CVD-D, MKD and CBN. This also applies to the process-induced modification of the material mechanical properties such as a specifically adjusted proportion of epsylon-phase in the subsurface areas of Co-Cr-Mo alloys. Reflections on the process rotary milling are planned in order to achieve appropriate surface roughness and reduce cutting forces.