覆膜砂SLS过程激光能量分布模型的建立及应用

针对具有新光束的CO_2激光器,建立了铸造覆膜砂SLS过程的激光能量分布模型,在该模型中,综合考虑了新型激光光束的光强分布特点,实际扫描过程中激光与覆膜砂的相互作用,以及扫描速度对激光能量输入的影响等因素。采用Ansys对覆膜砂SLS过程的激光能量分布模型进行计算,利用热像仪对覆膜砂选择性激光烧结过程的表面温度进行测定。经对比计算结果和测温结果,模拟计算与实际测温结果吻合良好。根据模拟计算结果所确定的工艺参数,实际制造出了具有较高精度的三维实体。覆膜砂SLS过程激光能量分布模型为激光快速成形工艺的计算机分析及优化奠定了基础。

Modeling & Application of Laser Energy Distribution in the Coated-sand SIS Process

Laser energy distributed model in the process of the foundry coated-sand selective laser sinte- ring was built.The model was based on the CO_2 laser generator which had new laser beam.The factors of the laser energy distribution characteristics,the interaction between laser beam and coated-sand in the process of laser scanning,and the effect of scanning speed on laser energy input had been taken into account in this mod- el.The model was calculated by Ansys,and the temperature fields of the coated-sand selective laser sinte- ring process were measured by thermal imager.The results of simulation and measurement were anastomotic. A high-precision three-dimensional entity has been manufactured based on the processing parameters of simulation.This model can be used to the computer aided optimization and analysis of laser rapid prototyping process.