扫描路径对选区激光熔化热力演变的影响  

Effect of Scanning Strategy on Thermodynamics Evolution of Selective Laser Melting

作　　者：边培莹 徐可为 尹恩怀 叶芳霞 张永建 Bian Peiying;Xu Kewei;Yin Enhuai;Ye Fangxia;Zhang Yongjian(Xi’an Key Laboratory of Intelligent Additive Manufacturing Technologies,Shaanxi Key Laboratory of Surface Engineering and Remanufacturing,School of Mechanical and Material Engineering,Xi’an University,Xi’an 710065,Shaanxi,China;The 20th Research Institute of China Electronics Technology Group Corporation,Xi’an 710068,Shaanxi,China)

机构地区：[1]西安文理学院机械与材料工程学院,陕西省表面工程与再制造重点实验室,西安市智能增材制造重点实验室,陕西西安710065 [2]中国电子科技集团公司第二十研究所,陕西西安710068

出　　处：《激光与光电子学进展》2023年第9期283-291,共9页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(11902250);陕西省自然科学基金(2019JQ891);西安市科技计划项目(21XJZZ0061);“陕西高校青年创新团队”资助项目。

摘　　要：选区激光熔化(SLM)是增材制造成形的主要工艺方式,其应用越来越广泛。影响其成形性能的主要因素是工艺参数组合方案,而扫描方式是其中的一个关键参数。本文以两种最常用的扫描路径为研究对象,深刻揭示其热力影响规律。首先建立符合SLM工艺特点的热力耦合仿真模型,并基于有限元软件进行二次开发,实现不同路径的仿真模拟;然后以一组工艺参数为例进行了仿真,结果表明,条纹式扫描轨迹的熔池几何和热应力均大于棋盘式;最后,通过熔道形貌与残余应力测试等多组试验数据均验证了仿真结果的正确性。该研究探明了扫描轨迹对SLM成形热力的影响关系,并为工程实践应用提供了一种高效的工艺仿真方法,从而便于进行SLM成形质量预判分析。Selective laser melting(SLM),the main additive manufacturing process,has been extensively used in manufacturing.The scanning strategy is one of the key parameters that affects the forming performance.In this study,two of the most popular scanning pathways were selected as the research objects to show their effect on thermodynamic laws.First,a thermodynamic coupling simulation model conforming to the characteristics of the SLM process was established,and a secondary development was performed based on finite element software to realize the simulation development of different paths.Then,a set of process parameters was used as a simulation example.The results show that the weld pool geometry and thermal stress of the striped scanning path are bigger than those of the chessboard pattern.Finally,several experimental datasets,including molten pool morphology and residual stress tests,confirmed that the simulation results were accurate.This study shows how the scanning trajectory affected the thermodynamics of SLM forming and provided an effective process simulation technique for engineering practice,which is convenient for SLM forming quality prediction analysis.

关 键 词：激光技术 选区激光熔化 扫描路径 热力仿真 熔道形貌 残余应力 

分 类 号：TH164[机械工程—机械制造及自动化]