基于多指标正交试验设计的SLS快速成型工艺参数优化

为提高SLS成型系统堆积方向微细结构的制作质量，以过度烧结深度、烧结密度和Z向尺寸偏差为优化指标，采用多指标的正交试验设计方法，通过极差分析法，讨论激光功率、预热温度、激光扫描速度、分层厚度等成型工艺参数对试件质量的影响，利用综合平衡法确定了最优工艺参数组合。试验结果表明：激光功率选取16 W，预热温度选取98℃，激光扫描速度选取3 m/s，分层厚度选取0.15 mm时，试件的制作质量为最优。试验结果有助于SLS快速成型系统提高堆积方向微细结构的制作质量。

Optimization of Process Parameters by Multi-Index Orthogonal Experiment in Selective Laser Sintering System

ln order to enhance the building quality of micro structure in Selective Laser Sintering System process in Z direction, considering over-sintering depth, the sintering density, and dimension variation in Z direction for optimizing evaluation, using analysis of Multi-Index Orthogonal Experiment, the influence of the laser power, scanning speed,preheating temperature and sintering thickness on sintering quality was discussed. An optimal combination of product quality was discovered by comprehensive weighting method. The confirmation experimental results showed that when the laser power was at 16 W, the scanning speed at 3 m/s, the preheating temperature at 98°C , the sintering thickness at 0.15 mm, and the quality of specimens was the optimal. The result of this experiment has great guidance to improve the building quality of micro structure in Z direction for the Selective Laser Sintering.