摘要
针对选择性激光烧结件力学性能和尺寸精度差的问题,通过机械混合法制备了聚苯乙烯/丙烯腈-丁二烯-苯乙烯塑料(PS/ABS)的复合粉末。在预热温度85℃、8层网格支撑等条件下,采用单因素实验法研究激光功率、扫描速度、扫描间距和单层厚度对烧结件强度和相对误差的变化规律,并用正交试验对工艺参数进行优化。结果表明,烧结件的弯曲强度随着激光功率的增加而提高,随扫描速度、扫描间距和单层厚度的增加而降低。Z向尺寸相对误差随着激光功率的增加而增大,随着扫描速度、扫描间距和单层厚度的增加而减小;由极差分析可知,激光功率对PS/ABS烧结件弯曲强度和Z向尺寸相对误差的影响最大;最优的工艺参数组合为:激光功率30 W、扫描速度1 200 mm/s、扫描间距0.32 mm和单层厚度0.26 mm,此时烧结件的弯曲强度为7.85 MPa,Z向尺寸相对误差为1.30%。
The problems that the low mechanical strength and weak dimensional accuracy of sintered parts molded by selective laser sintering(SLS)have been identified.Polystyrene/acrylonitrile butadiene styrene plastic(PS/ABS)composite powders were prepared by mechanical mixing.Under the condition of preheating temperature85℃and8layers of grid support,the changing regularity of the laser power,scanning speed,scanning interval and layer thickness on the strength and accuracy of the parts were studied by using single factor experiment.The process parameters were optimized by orthogonal experiment.The results show that the bending strength of the sintered parts is higher and higher with the increase of laser power,and lower and lower with the increase of greater scanning speed,scanning interval and layer thickness.The relative error of the Z-axis size increases with the increase of laser power,and decreases with the greater of the other three parameters.The range analysis results indicate that laser power’s effect on the bending strength and Z-axis size relative error of the PS/ABS specimen is maximum.The optimal combinations of process parameters are laser power30W,scanning speed1200mm/s,scanning interval0.32mm and layer thickness0.26mm,at this time,the bending strength of the sample is7.85MPa,the relative error of the Z-axis size is1.30%.
作者
杨来侠
周文明
王勃
杨繁荣
Yang Laixia;Zhou Wenming;Wang Bo;Yang Fanrong(College of Mechanical Engineering, Xi’an University of Science and Technology , Xi’an 710054, China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2017年第5期57-62,共6页
Engineering Plastics Application
基金
国家863计划项目(2015AA042503)
关键词
选择性激光烧结
聚苯乙烯/丙烯腈-丁二烯-苯乙烯塑料复合粉末
单因素实验法
正交试验
极差分析
工艺参数优化
selective laser sintering
polystyrene/acrylonitrile butadiene styrene plastic composite powders
single factor experiment
orthogonal experiment
range analysis
process parameter optimization
