薄壁件选区激光熔化成形精度控制分析及优化  

Analysis and optimization of precision control for selective laser melting forming of thin-walled parts

作　　者：祝世超 丁雨露 施书杰 龙兵 陈荣华 尹飞鸿[1] 赵景波 ZHU Shichao;DING Yulu;SHI Shujie;LONG Bing;CHEN Ronghua;YIN Feihong;ZHAO Jingbo(School of Aeronautics and Mechanical Engineering,Changzhou Institute of Technology,Changzhou 213032,China;School of Automotive Engineering,Changzhou Institute of Technology,Changzhou 213032,China)

机构地区：[1]常州工学院航空与机械工程学院,江苏常州213032 [2]常州工学院汽车工程学院,江苏常州213032

出　　处：《重庆理工大学学报（自然科学）》2024年第4期100-107,共8页Journal of Chongqing University of Technology：Natural Science

基　　金：中国博士后科学基金项目(2022M721395);国家自然科学基金项目(62273061);江苏省高等学校基础科学(自然科学)研究重大项目(22KJA580001)。

摘　　要：为了解决薄壁件选区激光熔化成形(selective laser melting,SLM)过程中残余应力引起的变形问题,保证成形精度,以SLM制备的钛合金雷达屏蔽器为研究对象,使用固有应变法对其进行变形分析和应力分析。提出了一种基于体素仿真模型的反变形补偿方法,并对其进行实验验证。结果表明:SLM制备的屏蔽器残余应力和位移较大,最大分别达831 MPa和0.61 mm。经过反变形补偿后,屏蔽器表面区域的整体变形量偏差从0.582 mm下降到0.438 mm以内,误差减少24.7%,从而保证了屏蔽器的打印质量。In order to solve the deformation problem of thin-walled parts caused by residual stress during the Selective Laser Melting(SLM)process and ensure forming accuracy,this paper takes the titanium alloy radar shielding device prepared by SLM as the research object and employs the inherent strain method to analyze its deformation and stress.It proposes an anti-deformation compensation method based on the voxel simulation model and experimentally verify the method.Selective Laser Melting(Selective Laser Melting)is one of the most mature and widely used metal additive manufacturing technologies in Additive Manufacturing(AM),which uses a high energy density laser beam as a heat source to melt metal powder layer by layer according to the slicing pattern with the assistance of computer software,and ultimately accumulates and forms dense three-dimensional solid parts,the printed parts have high precision,complex structure and high material utilization,and are now widely used in aviation,aerospace,energy,automotive and other fields.However,the uneven temperature gradient caused by the rapid heat melting and cooling solidification of metal powder in the SLM forming process gives rise to large residual stresses.Although there has been much research on reducing residual stress and controlling forming accuracy,researchers have not completely solved the deformation problem of thin-walled parts in the SLM process.On the one hand,due to the special structure of thin-walled parts,their indication accuracy requirements are also higher,and it is difficult to use in actual production because of the high cost of the way of experimental measurements;on the other hand,it takes a lot of computational and time costs in model simulation and computational compensation.Based on the intrinsic strain method,it calculates the stress field and deformation of the TC4 radar shielding device prepared in SLM and proposes an anti-deformation compensation method based on the voxel grid simulation model to solve the anti-deformation compensation model q

关 键 词：选区激光熔化 固有应变法 有限元分析 反变形补偿 

分 类 号：V19[航空宇航科学与技术—人机与环境工程]