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基于固有应变法的激光选区熔化成形变形趋势预测

Deformation Prediction of Metal Selective Laser Melting Based on Inherent Strain Method

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摘要

针对激光选区熔化(SLM)成形过程中易发生翘曲变形的问题, 建立了一种“热源-局部-结构件”三级递进模型, 采用生死单元法模拟了SLM成形中层层叠加的过程, 并逐层施加固有应变, 得到了宏观结构件SLM成形的变形趋势预测结果。将仿真结果与实际成形件进行对比, 结果表明, 固有应变有限元法能够有效预测SLM成形件的变形量。

Abstract

As for the problem that there occur warpage and deformation in the selective laser melting (SLM) forming process, a three-level progressive model of heat source-locality-structural parts is established and the layer by layer building process in SLM forming is simulated by the birth-death element method. The inherent strain is applied layer by layer to obtain the deformation prediction results of SLM forming of macroscopic structural parts. The comparison between the simulation results and the actual molded parts shows that the inherent strain finite element method can be used to effectively predict the deformation of SLM forming parts.

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中图分类号:TF124

DOI:10.3788/cjl201845.0702004

所属栏目:激光制造

基金项目:国家自然科学基金(51375242)、江苏省重点研发项目(BE2015165)

收稿日期:2018-01-25

修改稿日期:2018-03-02

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作者单位    点击查看

倪辰旖:南京理工大学机械工程学院, 江苏 南京 210094
张长东:南京理工大学机械工程学院, 江苏 南京 210094
刘婷婷:南京理工大学机械工程学院, 江苏 南京 210094
廖文和:南京理工大学机械工程学院, 江苏 南京 210094

联系人作者:廖文和(cnwho@njust.edu.cn)

备注:倪辰旖(1993-), 女, 硕士研究生, 主要从事激光选区熔化方面的研究。E-mail: ifican123@163.com

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引用该论文

Ni Chenyi,Zhang Changdong,Liu Tingting,Liao Wenhe. Deformation Prediction of Metal Selective Laser Melting Based on Inherent Strain Method[J]. Chinese Journal of Lasers, 2018, 45(7): 0702004

倪辰旖,张长东,刘婷婷,廖文和. 基于固有应变法的激光选区熔化成形变形趋势预测[J]. 中国激光, 2018, 45(7): 0702004

被引情况

【1】鄢然,李浩,李军超,朱丽. 基于响应面法的聚苯乙烯粉末选择性激光烧结成型工艺参数优化. 中国激光, 2019, 46(3): 302015--1

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