聚苯乙烯粉选择性激光烧结工艺参数优化  

Process Parameters' Optimization of Polystyrene Powder Based on Selective Laser Sintering

作　　者：杨来侠[1] 刘旭[1] 张文明[1] 

机构地区：[1]西安科技大学机械工程学院,西安710054

出　　处：《工程塑料应用》2015年第6期44-49,共6页Engineering Plastics Application

基　　金：国家863计划项目(2015AA042503)

摘　　要：对聚苯乙烯（PS）粉在激光功率20w、预热温度70℃、扫描间隔0．30min等工艺参数下，研究了扫描速度和层厚对烧结试样长度、宽度、高度相对误差及孔隙率等的影响，并在电镜下观察了烧结试样微观组织，对工艺参数进行优化。结果表明：PS粉烧结时，在不同工艺参数下会分为熔融区和微熔区，熔融区和微熔区烧结件长和宽均由于收缩变形而小于理论值；在熔融区，随着扫描速度和层厚的增大，长、宽尺寸精度越来越高；在微熔区，长、宽尺寸精度变化不大，同时试样由过深烧结到烧结不足，高度值由大变小，试样孔隙率逐渐增大。扫描速度对孔隙率影响较大，分层厚度对孔隙率影响较小，确定层厚在0．20～0．22mm、扫描速度在2100mm／s为最佳烧结工艺参数。Under the 20 W of laser power, 0.30 mm of scanning interval and 70 ℃ of preheating temperature, the effect of thic- kness of layers and scanning speed on the sample length＇ relative error, width＇ relative error, height＇ relative error and the porosity through sintered PS powder was studied, the structure of samples in SEM was observed. The process parameters were optimized .The results show that under different process parameters, the sintering results would be divided into the molten zone and the micro- molten zone, the values of length and width in the molten zone and the micro-molten zone are less than the theoretical value due to deformation of shrinkage.In the molten zone, with the increase of scanning speed and thickness of layers, the length＇ precision and width＇ precision are higher and higher. In the micro-molten zone, the changes of the length＇ precision and width＇ precision are very small. With the increase of scanning speed and thickness of layers, the process range from deep sintering to inadequate sintering, at the same time, sample porosity increases gradually. Scanning speed＇ effect on porosity is larger, thickness of layers＇ effect on porosity is small. With the layer thickness of 0.20 - 0.22 mm, and scanning speed of 2 100 mm/s, the sintered parts has a good quality.

关 键 词：聚苯乙烯 选择性激光烧结 相对误差 孔隙率 

分 类 号：TG439.4[金属学及工艺—焊接]