Micro milling of additively manufactured AISI 316L: impact of the layerwise microstructure on the process results
Micro milling of additively manufactured AISI 316L: impact of the layerwise microstructure on the process results
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DOI：
10.1007/s00170-020-06387-3
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发表时间：
2021-01-01
影响因子：
3.4
通讯作者：
Aurich, Jan C.
中科院分区：
文献类型：
--
作者：
Greco, Sebastian;Kieren-Ehses, Sonja;Aurich, Jan C.
在金属增材制造 (AM) 领域，最常用的方法之一是选择性激光熔化 (SLM)，通过激光在粉末床中逐层构建组件。 SLM 的过程由多个参数定义，例如激光功率、激光扫描速度、舱口间距或层厚度。通过增材制造制造小型部件非常困难，因为它对所用粉末和总体 SLM 工艺提出了很高的要求。因此，SLM 以及随后的微铣削是生产微结构增材制造部件的合适方法。此类组件的一种应用是微结构植入物，这种植入物通常是独特的，因此非常适合增材制造。为了实现增材制造材料的微加工，需要研究增材制造材料的特殊性能对微铣削过程的影响。在这项研究中，显示了由 AISI 316L 制成的增材制造工件的详细特征。此外，还研究了 SLM 期间定义的工艺参数和堆积方向对工件性能的影响。根据加工力、毛刺形成、表面粗糙度和刀具磨损，分析和评估工件特性对微铣削产生的影响。根据 SLM 过程中产生的熔体路径的几何形状，微铣削结果存在显着差异。
In the field of metal additive manufacturing (AM), one of the most used methods is selective laser melting (SLM)-building components layer by layer in a powder bed via laser. The process of SLM is defined by several parameters like laser power, laser scanning speed, hatch spacing, or layer thickness. The manufacturing of small components via AM is very difficult as it sets high demands on the powder to be used and on the SLM process in general. Hence, SLM with subsequent micromilling is a suitable method for the production of microstructured, additively manufactured components. One application for this kind of components is microstructured implants which are typically unique and therefore well suited for additive manufacturing. In order to enable the micromachining of additively manufactured materials, the influence of the special properties of the additive manufactured material on micromilling processes needs to be investigated. In this research, a detailed characterization of additive manufactured workpieces made of AISI 316L is shown. Further, the impact of the process parameters and the build-up direction defined during SLM on the workpiece properties is investigated. The resulting impact of the workpiece properties on micromilling is analyzed and rated on the basis of process forces, burr formation, surface roughness, and tool wear. Significant differences in the results of micromilling were found depending on the geometry of the melt paths generated during SLM.