选区激光熔化成型悬垂结构特征模拟分析

林会杰; 沈理达; 姜金辉; 谢德巧; 梁绘昕; 范钦春

doi:10.7527/S1000-6893.2018.21897

航空学报 >

2018 , Vol. 39 >Issue 7: 421897 - 421897

DOI: https://doi.org/10.7527/S1000-6893.2018.21897

材料工程与机械制造

选区激光熔化成型悬垂结构特征模拟分析

林会杰 ,
沈理达 ,
姜金辉 ,
谢德巧 ,
梁绘昕 ,
范钦春

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1. 南京航空航天大学机电学院, 南京 210016;
2. 南京航空航天大学航空宇航学院, 南京 210016;
3. 南京中科煜宸激光技术有限公司, 南京 210046

收稿日期: 2017-11-27

修回日期: 2018-03-07

网络出版日期: 2018-03-07

基金资助

国家自然科学基金（U1537105）；国家重点研发计划（2016YFB1100500）；江苏省科技支撑计划重点资助项目（BE2014009-1）；江苏省重点研发计划竞争资助项目（BE2015161）；江苏省重点研发计划重点资助项目（BE2016010-3）

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Simulation analysis of features of overhanging structure fabricated by selective laser melting

LIN Huijie ,
SHEN Lida ,
JIANG Jinhui ,
XIE Deqiao ,
LIANG Huixin ,
FAN Qinchun

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1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
3. Nanjing Zhongke Raycham Laser Technology Co., Ltd., Nanjing 210046, China

Received date: 2017-11-27

Revised date: 2018-03-07

Online published: 2018-03-07

Supported by

National Natural Science Foundation of China (U1537105); National Key Research and Development Plan (2016YFB1100500); Key Support Projects for Jiangsu Science and Technology Support Program (BE2014009-1); Competition Support Project for Jiangsu Science and Technology Support Program (BE2015161); Key Support Projects for Jiangsu Science and Technology Support Program (BE2016010-3)

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摘要

针对选区激光熔化成型悬垂结构过程进行温度场与应力场模拟。利用有限元分析软件建立三维瞬态选区激光熔化成型悬垂结构的过程模型，分析加工过程温度场应力场分布情况及变化趋势。针对不同激光功率与扫描速度对悬垂结构成型质量的影响进行仿真分析与实验验证。分析结果表明，在选区激光熔化成型悬垂结构过程中，在激光扫描悬垂位置时熔池温度值明显高于激光扫描打印件中心位置时的熔池温度，成型件与基板接触的边角位置具有最大的残余应力，悬垂结构位置出现明显变形，在激光功率与扫描速度比值不变情况下，激光功率越大，悬垂结构位置变形越大。

关键词： 选区激光熔化; 温度场; 仿真分析; 悬垂结构; 翘曲变形

本文引用格式

林会杰 , 沈理达 , 姜金辉 , 谢德巧 , 梁绘昕 , 范钦春 . 选区激光熔化成型悬垂结构特征模拟分析[J]. 航空学报, 2018 , 39(7) : 421897 -421897 . DOI: 10.7527/S1000-6893.2018.21897

Abstract

The temperature field and stress field of the overhanging structure fabricated by selective laser melting are simulated. Finite element analysis software is used to establish a three-dimensional transient model for the structure. The influence of laser power and scanning speed on the forming quality of the structure is analyzed numerically and validated experimentally. The results show that in the forming process of the structure, the temperature of the molten pool located at the overhanging position is obviously higher than that located at the central position when laser scanning these position. The maximum residual stress occurs at the coincident crossover points of the layer scan region and the substrate. Obvious deformation occurs at the position of the overhanging structure. When the ratio of laser power to sweep velocity is constant, the greater the laser power is, the larger deformation the overhanging structure has.

Key words： selective laser melting; temperature field; simulation analysis; overhanging structure; warping deformation

参考文献

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