激光选区熔化成型设备风场仿真及优化

Wind Field Simulation and Optimization of Laser Selective Melting Forming Equipment

摘要: 激光选区熔化成型设备打印零件过程中产生的黑烟颗粒不仅会对激光镜片造成腐蚀，而且直接影响加工零件的致密度。因此对成型舱内设计合理、均匀的风场结构，科学有效地去除打印过程中产生的黑烟颗粒至关重要。本文以一台大型激光选区熔化成型设备为研究对象，设计进气道结构并通过数值模拟获取该流道下风场特征，根据风场仿真结果采用整流板、圆形栅格板和蜂窝状栅格板结合的方式对成型舱内风场进行优化。结果表明：改进流道在成型区上方区域产生的风场分布更加均匀。

Abstract: The black smoke particles produced in the process of printing parts by laser selective melting molding equipment will not only corrode the laser lens, but also directly affect the density of the processed parts. Therefore, it is very important to design a reasonable and uniform wind field structure in the forming cabin and remove the black smoke particles produced in the printing process scientifically and effectively. In this paper, a large laser selective melting molding equipment is taken as the research object. The inlet structure is designed and the wind field characteristics under the flow channel are obtained by numerical simulation. According to the simulation results of the wind field, the wind field in the molding chamber is optimized by combining the rectifier plate, the circular grid plate and the honeycomb grid plate. The results show that the wind field distribution generated by the improved flow channel in the upper region of the forming area is more uniform.