基于悬垂识别的激光扫描路径分区域规划方法  

Regional planning of laser scanning path based on overhang structure recognition

作　　者：李军[1] 韩晓辉 刘婷婷[1] 廖文和[1] 张长东[1] 张昌春 LI Jun;HAN Xiaohui;LIU Tingting;LIAO Wenhe;ZHANG Changdong;ZHANG Changchun(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学机械工程学院,南京210094

出　　处：《材料工程》2023年第11期120-133,共14页Journal of Materials Engineering

基　　金：国家重点研发计划项目(2021YFB1715100);工信部民机科研项目(MJZ-2017-G-65);江苏省省级工业和信息化产业转型升级专项资金项目(智能化金属增减材制造装备)(JITC-2000AX0676-71)。

摘　　要：扫描路径规划是激光选区熔化(SLM)增材制造技术的关键工艺策略,结合三维模型的显著结构特征实现工艺路径的规划,是改善零件成形质量的重要措施。提出了基于悬垂识别的SLM分区域路径规划方法,通过识别三维模型的悬垂特征区域,结合轮廓偏置算法实现成形区域的分割及扫描路径的规划。采用数值模拟与工艺实验相结合的方法,研究扫描线角度、层间旋转以及不同偏置距离等分区域路径规划参数对悬垂结构特征成形质量的影响规律。结果表明,当悬垂边偏置合理距离且该区域采用平行于悬垂边的扫描策略时,其悬垂边上的变形与残余应力最大可降低54%与73%。Planning of laser scanning path is the key process strategy of selective laser melting(SLM)additive manufacturing technology.Combining the significant structural characteristics of a threedimensional model to realize process path planning is an important measure to improve the forming quality of parts.An SLM regional path planning method based on suspension recognition was proposed.By identifying the suspension characteristic region of the three-dimensional model,combined with the contour offset algorithm,the forming region segmentation and scanning path planning are realized.The effects of scanning line angle,interlayer rotation and different offset distance on the forming quality of suspension structure characteristics were studied by means of numerical simulation and process test.The results show that when the overhanging edge is offset by a reasonable distances and the scanning strategy parallel to the overhanging edge is adopted in this area,the deformation and residual stress on the overhanging edge can be reduced by 54% and 73% at most.

关 键 词：激光选区熔化 悬垂结构 特征识别 数值模拟 

分 类 号：TN249[电子电信—物理电子学] TH164[机械工程—机械制造及自动化]