在不锈钢间接选区激光烧结过程中，由于存在温度梯度场，将产生较大的残余应力和翘曲变形，从而会降低成型件的烧结精度。为了提高不锈钢件的激光烧结成型质量，对316L间接选区激光烧结耦合热应力场进行了数值模拟分析，与烧结实验进行了对比研究。研究表明，模拟结果与烧结实验的实物变形趋势相吻合，验证了模拟的正确性。采用该模拟方案，结合正交试验方法对激光功率、扫描间距、扫描速度和预热温度等4个工艺参数进行了优化，获得了一组最优工艺设计参数。研究结果为间接选区激光烧结成形质量提供了有力的工艺参数判据，具有重要的经济价值和应用前景。
During the indirect selective laser sintering of stainless steel parts,the precision of forming parts will be reduced.Due to the temperature gradient field,greater residual stress and warpage will be produced.To im-prove the sintering quality of stainless steel parts,the paper presented numerical analysis on coupled thermal stress field of 316L sintering.Then the results were compared with experiments.These results demonstrated the simulation was consistent with the physical deformation trend of sintering experiments.It verifies the cor-rectness of the simulation.Using the simulation program and orthogonal test method,four process parameters (laser power,scan spacing,scan speed and preheating temperature)are optimized.A group of optimum process parameters was obtained.These results provide a powerful criterion to get good process parameters of SLS with important economic value and promising application.
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