选择性激光烧结聚苯乙烯/玻璃纤维制件的工艺研究

将聚苯乙烯(PS)粉与玻璃纤维(GF)粉通过机械混合制备复合粉料,利用选择性激光烧结技术制备了PS/GF烧结制件,在激光功率25 W、预热温度75℃下研究了扫描速度、单层厚度和扫描间距对PS/GF制件弯曲强度和Z向尺寸的影响,并对工艺参数进行了正交优化。结果表明,在实验取值范围内,随上述3种工艺参数值的增大,制件弯曲强度呈降低趋势,而Z向尺寸相对误差由正值逐渐向负值发展。正交试验结果表明,扫描速度对制件的弯曲强度和尺寸精度影响最大,扫描间距影响次之,单层厚度影响最小;确定了扫描速度1 200 mm/s、单层厚度0.25 mm、扫描间距0.28 mm为最佳工艺参数,此时制件弯曲强度为10.41 MPa,Z向尺寸相对误差为2.35%,基本满足制件的应用要求。

Technology Study of Polystyrene/Glass Fiber Parts Molded by Selective Laser Sintering

Polystyrene (PS)/glassfiber (GF) composite powder was prepared by mechanical mixing,then PS/GF sintering parts were prepared by selective laser sintering technology. Under the laser power of 25 W and preheating temperature of 75℃,the effects of scanning speed,layer thickness and scanning interval on the bending strength andZ direction size of PS/GF parts were studied and the process parameters were optimized through orthogonal test. The results show that in the range of experimental value, with the increase of the three parameter values,the bending strength decreases and the relative error ofZ direction size develops from positive value to negative value. The orthogonal test results indicate that scanning speed is one of the biggest influence factor on bending strength and size precision of the parts,the second is scanning interval,the third is layer thickness,and scanning speed of 1 200 mm/s,layer thickness of 0.25 mm and scanning interval of 0.28 mm is the best process parameters,at this time the bending strength of the parts is 10.41 MPa,and the relative error ofZ direction size is 2.35%,which can meet the application requirements of the parts.