Development of SLM cellular structures for injection molds manufacturing

C. Malca , C. Santos , M. Sena , A. Mateus
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引用次数: 12

Abstract

Using selective laser melting (SLM) is possible to manufacture molds with cellular internal structures with different porosity degree. Furthermore, internal geometry design can be improved as a function of the desired structural and thermal stress solicitations. In this work two types of cellular internal structures – hexagonal and cub-octahedral – were developed and manufactured using the SLM process. These topologies were generated with the purpose of creating a high degree of internal porosity and getting satisfactory results in terms of thermal and mechanical behavior when compared with similar dimensional bulk structures. The mechanical and thermal behaviors of each cellular topology were evaluated numerically and experimentally through compression and thermal tests. From numeric and experimental results, it can be concluded that hexagonal cellular internal topology provides a higher mechanical strength when compared to the cub-octahedral cellular structure while the thermal analysis shows that cub-octahedral topology is more efficient for heat dissipation. Both cellular topologies have demonstrated, however, to be appropriate for use in injection mold structures. In addition, the use of these cellular topologies provides light weight structuring with an approximate 58% weight reduction, which represents a considerable saving of material total cost to manufacturing of an injection mold.

用于注射模具制造的SLM细胞结构的发展
采用选择性激光熔化(SLM)技术可以制造具有不同孔隙度的胞状内部结构的模具。此外,内部几何设计可以作为期望的结构和热应力请求的函数来改进。本研究利用SLM工艺制备了两种类型的细胞内部结构——六边形和立方八面体。产生这些拓扑结构的目的是创造高度的内部孔隙度,并与类似尺寸的体结构相比,在热性能和力学性能方面获得令人满意的结果。通过压缩和热测试,对每个细胞拓扑的力学和热行为进行了数值和实验评估。数值和实验结果表明,与立方体八面体胞体结构相比,六角形胞体内部拓扑结构具有更高的机械强度;热分析表明,立方体八面体内部拓扑结构具有更高的散热效率。然而,这两种细胞拓扑结构都被证明适用于注射模具结构。此外,这些细胞拓扑结构的使用提供了重量轻的结构,重量减轻了大约58%,这意味着在制造注塑模具时节省了相当大的材料总成本。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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