为了探寻选区激光烧结工艺参量对聚苯乙烯粉烧结质量影响的规律, 并通过工艺参量的优化来提高其烧结精度与强度, 采用对聚苯乙烯粉进行热重/差示扫描量热法实验分析、利用SLS300快速成型机对聚苯乙烯粉烧结等方法, 进行了理论分析和实验验证, 发现烧结温度在150℃~260℃之间时,试样烧结尺寸精度较高。结果表明, 聚苯乙烯粉烧结件的x向和y向尺寸精度受工艺参量影响较小, 而z向尺寸精度受工艺参量影响较大; 弯曲强度表现为随激光功率、扫描间隔、分层厚度的增大而减小的变化趋势。这对于工艺参量优化选择来提高聚苯乙烯粉的烧结质量提供了实验依据。

In order to explore effects of process parameters of selective laser sintering on polystyrene powder and improve the strength and accuracy of polystyrene (PS) powder by the improved process parameters, thermal gravity/differential scanning calorimetry analysis was made to study thermal properties of PS powder. Sintering experiment of powder was carried out by SLS300 rapid molding machine. After theoretical analysis and experimental verification, the samples had high precision when sintering temperature was between 150℃ and 260℃. The results show that the effects of process parameters on dimensional precision of x axis and y axis are small, the effect on dimensional precision of z axis is great. Bending strength decreases with the increase of laser power, scanning interval and layer thickness. The study provides experimental basis to improve sintering quality of PS by the optimization of process parameters.