聚苯乙烯粉选择性激光烧结的支撑烧结研究

为了解决聚苯乙烯(PS)粉选择性激光烧结(SLS)成型工艺中制件成型缺陷问题,通过一系列烧结实验,分析了缺陷的种类及原因,利用"二次烧结"现象,以试样Z向尺寸高度和尺寸方差为评价指标,在最优烧结工艺参数支撑扫描速度4 500 mm/s,支撑扫描间隔为3 mm下对不同层数和类型的支撑扫描进行了对比实验。结果表明,支撑扫描可有效改善制件翘曲问题,当支撑层数为8层,支撑类型为网格型时,制件质量较好。

The Support Scanning Sintering Study on PS Powder Based on Selective Laser Sintering

In order to solve the problem with the polystyrene powders sintered parts drawback by the selective laser sintering (SLS), the types and causes of defects were analysed through a series of sintering experiments, using the“secondary sintering” phenomenon,makeZ dimension height and size variance as evaluation index, the compared experiment on different types and layers of support scanning was conducted with the optimum process parameters,the support scanning interval is 3 mm and scanning speed is 4 500 mm/s. The results show that the formation quality is improved effectively through the support scanning. When the support layer is 8 layerand the type of support is the grid type, good quality parts is obtained.