基于尺寸补偿模型的PA12粉末选择性激光烧结工艺精度优化方法  

A Process Precision Optimization Method for Selective Laser Sintering of PA12 Powder Based on Size Compensation Model

作　　者：殷勤 曹腾飞 鄢然 夏磊 张凯飞 Yin Qin;Cao Tengfei;Yan Ran;Xia Lei;Zhang Kaifei(College of Mechanical Engineering,Chongqin University of Technology,Chongqing 430074,China)

机构地区：[1]重庆理工大学机械工程学院,重庆430074

出　　处：《工程塑料应用》2022年第12期49-55,共7页Engineering Plastics Application

基　　金：国家自然科学基金面上项目(51775069);重庆市科学技术委员会面上项目(cstc2020jcyj-msxmX0248);重庆市教委科学技术研究项目(KJQN202201112);重庆理工大学科研启动基金项目。

摘　　要：针对选择性激光烧结(SLS)聚十二内酰胺(PA12)粉末材料成型件尺寸精度差的问题,提出一种能够实现精度优化的尺寸补偿模型,在相同工艺参数下,基于该模型对扫描轮廓进行补偿,可大幅提高最终的成型件精度。结果表明,在170℃预热温度、激光功率16 W、分层厚度0.1 mm、扫描速度2500 mm/s、单层厚度0.1 mm的工艺参数下,该模型计算出X向修正系数为1.0424、Y向修正系数为1.0445、激光光斑补偿系数为0.3231、Z向修正系数为1.0263、首层补偿系数为0.2989。通过实验验证,经过补偿后的模型烧结精度得到明显提升,外轮廓和竖直方向精度保持在了0.1 mm以内,内轮廓可以控制在0.2 mm以内,满足了绝大多数的生产需求。Aiming at the problem of high dimensional accuracy of polylaurylamide 12(PA12)powder material molded parts by selective laser sintering,we propose a size compensation model that can achieve precision optimization.Under the same process parameters,the scanning profile is compensated based on this model,which can greatly improve the accuracy of the final molded part.The results show that the X-direction correction coefficient is 1.0424,the Y-direction correction coefficient is 1.0445,the laser spot compensation coefficient is 0.3231,and the Z-direction correction coefficient is 1.0263,the compensation coefficient of the first floor is 0.2989,under the process parameters of 170℃preheating temperature,16 W laser power,0.1 mm layer thickness,2500 mm/s scanning speed,and 0.1 mm single layer thickness.Through experimental verification,the sintering accuracy of the modified model has been significantly improved,the outer contour and vertical accuracy have been kept within 0.1 mm,and inner contour has been kept within 0.2 mm,which can meet the most production needs.

关 键 词：选择性激光烧结 尺寸补偿模型 修正系数 尺寸精度 3D打印 

分 类 号：TQ322.2[化学工程—合成树脂塑料工业]