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用于铸件的3D打印晶格增强变厚度壳模设计

The Design of 3D-Printed Lattice-Reinforced Thickness-Varying Shell Molds for Castings.

作者信息

Shangguan Haolong, Kang Jinwu, Yi Jihao, Zhang Xiaochuan, Wang Xiang, Wang Haibin, Huang Tao

机构信息

Key Laboratory for Advanced Materials Processing Technology, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.

School of Computer Science, Peking University, Beijing 100871, China.

出版信息

Materials (Basel). 2018 Mar 30;11(4):535. doi: 10.3390/ma11040535.

DOI:10.3390/ma11040535
PMID:29601543
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5951419/
Abstract

3D printing technologies have been used gradually for the fabrication of sand molds and cores for castings, even though these molds and cores are dense structures. In this paper, a generation method for lattice-reinforced thickness-varying shell molds is proposed and presented. The first step is the discretization of the STL (Stereo Lithography) model of a casting into finite difference meshes. After this, a shell is formed by surrounding the casting with varying thickness, which is roughly proportional to the surface temperature distribution of the casting that is acquired by virtually cooling it in the environment. A regular lattice is subsequently constructed to support the shell. The outside surface of the shell and lattice in the cubic mesh format is then converted to STL format to serve as the external surface of the new shell mold. The internal surface of the new mold is the casting's surface with the normals of all of the triangles in STL format reversed. Experimental verification was performed on an Al alloy wheel hub casting. Its lattice-reinforced thickness-varying shell mold was generated by the proposed method and fabricated by the binder jetting 3D printing. The poured wheel hub casting was sound and of good surface smoothness. The cooling rate of the wheel hub casting was greatly increased due to the shell mold structure. This lattice-reinforced thickness-varying shell mold generation method is of great significance for mold design for castings to achieve cooling control.

摘要

3D打印技术已逐渐用于制造铸件的砂型和型芯，尽管这些砂型和型芯是致密结构。本文提出并展示了一种用于晶格增强的厚度可变壳型的生成方法。第一步是将铸件的STL（立体光刻）模型离散化为有限差分网格。在此之后，通过用变化的厚度围绕铸件形成一个壳，该厚度大致与通过在环境中虚拟冷却铸件获得的铸件表面温度分布成比例。随后构建一个规则晶格来支撑壳。然后将立方网格格式的壳和晶格的外表面转换为STL格式，以用作新壳型的外表面。新模具的内表面是铸件的表面，其STL格式中所有三角形的法线方向相反。对铝合金轮毂铸件进行了实验验证。通过所提出的方法生成了其晶格增强的厚度可变壳型，并通过粘结剂喷射3D打印进行制造。浇注的轮毂铸件完好，表面光滑度良好。由于壳型结构，轮毂铸件的冷却速率大大提高。这种晶格增强的厚度可变壳型生成方法对于铸件的模具设计以实现冷却控制具有重要意义。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a916/5951419/ac2ca1134ece/materials-11-00535-g013.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a916/5951419/ac2ca1134ece/materials-11-00535-g013.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a916/5951419/54c6e8ce60fd/materials-11-00535-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a916/5951419/d3384ffd7b24/materials-11-00535-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a916/5951419/b690fb31bc00/materials-11-00535-g009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a916/5951419/1a3a3982c567/materials-11-00535-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a916/5951419/d31bdf6f1fdc/materials-11-00535-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a916/5951419/ac2ca1134ece/materials-11-00535-g013.jpg

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本文引用的文献

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