激光选区熔化成型腔内流场优化及飞溅去除研究
Investigation of the Flow Field Optimization and Spatter Removal in an Selective Laser Melting Build Chamber
尚小标 1李佳剑 2黎振华 3肖人友 2张志浩2
作者信息
- 1. 昆明理工大学机电工程学院,云南昆明 650500;微波能工程应用及装备技术国家地方联合工程实验室,云南昆明 650093
- 2. 昆明理工大学机电工程学院,云南昆明 650500
- 3. 昆明理工大学工程训练中心,云南昆明 650500
- 折叠
摘要
为减少激光选区熔化过程中飞溅物的残留,提高成型零件的质量,构建EOS M290型激光选区熔化设备成型腔的计算流体力学模型和流体流动颗粒追踪模型,研究不同进气速度、进气孔直径、进气孔拉伸长度和出气口栅格数量对成型腔内流场分布和飞溅颗粒去除概率的影响.结果表明,当316L不锈钢飞溅颗粒直径为10～100 μm范围内的4种正态分布时,原模型在进气速度为3 m/s时,去除概率仅为69.25％;延长进气孔可以改善成型腔内流场的均匀性和抑制Coanda效应,进气速度为3 m/s,进气孔拉伸长度为90 mm时,去除概率提高到74.64％;进气速度为3 m/s时,出气口栅格数量从5增加到9,出气口中心平面均匀性指数从64.42％增加到78.57％;在粉床不被破坏的情况下,优化模型(进气孔直径4 mm、进气孔拉伸长度90 mm、出气口栅格数量8)的最大进气速度为4.46 m/s,飞溅颗粒去除概率提升至82.11％.
Abstract
To enhance the quality of selective laser melting(SLM)parts by reducing spatter residue,a computational fluid dy-namics(CFD)model and fluid flow particle tracking model of the EOS M290 SLM equipment build chamber were developed.The study investigates the impact of various parameters such as inlet velocities,inlet hole diameters,inlet hole stretching lengths,and outlet grid numbers on flow field distribution and spatter particle removal within the build chamber.The findings reveal that when the diameter of 316L stainless steel spatter particles is in the range of 10-100 μm with four normal distribu-tions,the removal probability of the original model is only 69.25％when the inlet velocity is 3 m/s.The uniformity of the flow field in the build chamber can be improved and the Coanda effect can be reduced by lengthening the inlet hole.The removal probability increases to 74.64％when the inlet velocity is 3 m/s and the stretch length of the inlet hole is 90 mm.When the in-let velocity is 3 m/s and the number of outlet grids increased from 5 to 9,the uniformity index of outlet center plane increased from 64.42％to 78.57％.When the powder bed is not destroyed,the maximum inlet velocity of the optimization model estab-lished by the inlet diameter of 4 mm,the inlet stretch length of 90 mm,the number of outlet grids 8 is 4.46 m/s,and the spat-ter removal probability is increased to 82.11％.
关键词
激光选区熔化/飞溅/计算流体力学/流体流动颗粒追踪Key words
selective laser melting/spatter/computational fluid dynamics/fluid flow particle tracking引用本文复制引用
出版年
2024
NETL
NSTL
万方数据