基于响应面法的聚苯乙烯粉末选择性激光烧结成型工艺参数优化

Process Parameters Optimization of Polystyrene Powder Selective Laser Sintering Based on Response Surface Methodology

以聚苯乙烯粉末为实验材料,以尺寸精度作为评价指标,研究了激光功率、扫描间距、单层厚度、扫描速度及它们的交互作用对选择性激光烧结制件成型精度的影响,通过响应面法建立了工艺参数与尺寸精度之间的数学模型,得出了最优的工艺参数。研究结果表明,尺寸偏差率随激光功率与扫描速度的增大而减小,随单层厚度的增大先增大后减小,随扫描间距的增大而增大;激光功率和单层厚度及扫描间距和单层厚度的交互作用对尺寸偏差率影响较显著;响应面预测值与实际值最大误差低于7%。

Taking polystyrene powder as experimental material and dimensional accuracy as evaluation index,we study the effects of laser power,scanning pitch,layer thickness and scanning speed and their interactions on the forming precision of selective laser sintering parts.The mathematical model between process parameters and dimensional accuracy are achieved and the optimal process parameters are obtained by response surface methodology.The research results show that the dimensional deviation rate decreases with the increase of laser power and scanning speed,increases at first and then decreases with the increase of layer thickness,and increases with the increase of scanning pitch.The interaction between laser power and single layer thickness and the interaction between scanning pitch and layer thickness have a significant effect on the dimensional deviation rate.The maximum error between the predicted value of the response surface method and the actual value is less than 7%.