Parameter identification approach for support structures in laser powder bed fusion and analysis of influencing factors
Parameter identification approach for support structures in laser powder bed fusion and analysis of influencing factors
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DOI：
10.1016/j.procir.2020.09.049
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
M. Schmitt;Bernhard Kempter;G. Schlick;G. Reinhart
中科院分区：
文献类型：
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作者：
M. Schmitt;Bernhard Kempter;G. Schlick;G. Reinhart
附加制造，特别是激光粉床熔化(LPBF)，使复杂零件的堆积成为可能。LPBF是一种几何自由度很高的技术，但有生产限制，例如关于悬挑。尽管有这些限制，生产这些部件的一种策略是使用支撑结构。与部件参数相反，支撑结构的参数确定被严重忽视。本文提出了一种确定支撑结构参数的方法。开发了用于确定机械性能(拉伸和扭转性能)的测试几何。随后，以16MnCr5硬化钢为例，确定了制造参数(如激光功率)对广泛使用的点阵支承性能的影响。结果表明，支撑结构的抗剪强度和抗拉强度受所用制造参数的影响。此外，还研究了网格间距、穿孔等几何参数对抗拉强度的影响。
Additive manufacturing, especially laser powder bed fusion (LPBF), enables the build-up of complex parts. LPBF is a technology with high geometric degrees of freedom, but there are production restrictions, e.g. with regard to overhangs. One strategy to produce these components despite the restrictions is the use of support structures.Parameter determination for support structures is strongly neglected in contrast to component parameters. In this paper, a methodology for determining parameters for support structures is presented. Test geometries for the determination of mechanical properties (tensile and torsional properties) are developed. Subsequently, the influence of the manufacturing parameters (e.g. laser power) on the properties of the widely used lattice support are determined for the case-hardening steel 16MnCr5. It can be shown that shear and tensile strength of the support structures are influenced by the applied manufacturing parameters. Furthermore, the influence of geometrical parameters such as grid spacing and perforation on the tensile strength is investigated.