聚合物选区激光烧结粉末加热模拟  

Heating simulation of polymer selective laser sintered powder

作　　者：蔡令令 丁浩亮[2] 孟娟 温馨 严波[1] CAI Lingling;DING Haoliang;MENG Juan;WEN Xin;YAN Bo

机构地区：[1]上海交通大学材料科学与工程学院,上海200030 [2]航天材料及工艺研究所,北京100076

出　　处：《模具技术》2021年第5期50-54,共5页Die and Mould Technology

基　　金：国家重点研发计划(2018YFB1106700);国家自然科学基金项目(51005151)

摘　　要：采用序贯加法堆积和光线跟踪算法建立了烧结过程的粉末堆积和温度分布计算模型,粉末颗粒的温度分布决定烧结的熔池形态和烧结产品性能。在光线跟踪过程中考虑了反射、透射和折射过程。模拟结果表明:粉末堆积模拟结果与文献中的致密度和配位数一致;被激光照射的粉末床体,激光中心处温度最高,远离激光中心处,温度降低,且距离越远,温度越低;熔池温度随着激光功率的增大而升高,随着扫描速度的增加而降低。A computational model of powder stacking and temperature distribution in sintering process was established by using sequential addition stacking and ray tracing algorithm.The temperature distribution of powder particles determines the shape of molten pool and the properties of sintered products.Reflection,transmission and refraction are considered in ray tracing.The results of powder stacking simulation are consistent with the densities and coordination numbers in the literature.The temperature of the powder bed irradiated by laser is the highest at the laser beam center,and decreases with the distance from the laser center.The temperature of molten pool rises with the increase of laser power while drops with the increase of scanning speed.

关 键 词：选区激光烧结 序贯加法堆积 光线跟踪 数值模拟 

分 类 号：TQ320.6[化学工程—合成树脂塑料工业]