Allegri Gabriele, Colpani Alessandro, Ginestra Paola Serena, Attanasio Aldo
Department of Mechanical and Industrial Engineering, University of Brescia, Via Branze 38, 25123 Brescia (BS), Italy.
Materials (Basel). 2019 Jul 9;12(13):2208. doi: 10.3390/ma12132208.
Cobalt-chromium-molybdenum (Co-Cr-Mo) alloys are very promising materials, in particular, in the biomedical field where their unique properties of biocompatibility and wear resistance can be exploited for surgery applications, prostheses, and many other medical devices. While Additive Manufacturing is a key technology in this field, micro-milling can be used for the creation of micro-scale details on the printed parts, not obtainable with Additive Manufacturing techniques. In particular, there is a lack of scientific research in the field of the fundamental material removal mechanisms involving micro-milling of Co-Cr-Mo alloys. Therefore, this paper presents a micro-milling characterization of Co-Cr-Mo samples produced by Additive Manufacturing with the Selective Laser Melting (SLM) technique. In particular, microchannels with different depths were made in order to evaluate the material behavior, including the chip formation mechanism, in micro-milling. In addition, the resulting surface roughness (Ra and Sa) and hardness were analyzed. Finally, the cutting forces were acquired and analyzed in order to ascertain the minimum uncut chip thickness for the material. The results of the characterization studies can be used as a basis for the identification of a machining window for micro-milling of biomedical grade cobalt-chromium-molybdenum (Co-Cr-Mo) alloys.
钴铬钼（Co-Cr-Mo）合金是非常有前景的材料，尤其是在生物医学领域，其生物相容性和耐磨性等独特性能可用于手术应用、假体及许多其他医疗设备。虽然增材制造是该领域的一项关键技术，但微铣削可用于在打印部件上制造增材制造技术无法获得的微观细节。特别是，在涉及Co-Cr-Mo合金微铣削的基本材料去除机制领域缺乏科学研究。因此，本文对采用选择性激光熔化（SLM）技术通过增材制造生产的Co-Cr-Mo样品进行了微铣削表征。具体而言，制作了不同深度的微通道，以评估微铣削过程中的材料行为，包括切屑形成机制。此外，还分析了所得的表面粗糙度（Ra和Sa）及硬度。最后，获取并分析了切削力，以确定该材料的最小未切削切屑厚度。表征研究结果可作为确定生物医学级钴铬钼（Co-Cr-Mo）合金微铣削加工窗口的基础。
