中国激光, 2010, 37 (12): 3162, 网络出版: 2014-03-12
载气式同轴送粉喷嘴的数值模拟及实验研究
Numerical Simulation and Experimental Research on Gas-Carrier Coaxial Powder Nozzle
光学制造 激光金属直接制造 同轴送粉喷嘴 数值模拟 工艺参数 optical fabrication laser direct metal manufacturing coaxial nozzle numerical simulation process parameters
摘要
为了提高同轴送粉喷嘴的汇聚性,增大粉末汇聚焦距,解决成形过程中粉末利用率低及粉末反弹造成的喷嘴堵粉等问题,研究了同轴送粉喷嘴结构参数中的粉腔间隙和粉腔锥角对粉末汇聚的影响规律。计算结果表明,在其他工艺参数一定的条件下,粉腔间隙越小,粉末的汇聚性越好;粉腔锥角越大,粉末的汇聚焦距越大,有利于零件的成形。所建模型和模拟结果对同轴送粉喷嘴的结构优化设计具有参考价值。并对模拟结果进行了实验验证,得到了工艺参数对单道高度和宽度的影响,并优化了工艺参数,最终制造出高度均匀的薄壁零件。
Abstract
In order to solve the problems of poor utilization of powder and nozzle blocked by rebounded powder by improving the powder gathering characteristic and increasing the powder focal length, the influence of the cone ring gap and the cone angle of the coaxial nozzle on the powder convergence is studied. The results show that the powder gathering characteristic is better when the cone ring gap is smaller and the nozzle focal length is longer when the cone angle is bigger with other process parameters invariable. The conclusion is valuable for the coaxial nozzle designing and performance improving.The simulation results are verified by experiments. The effects of process parameters on the height and width of the single-trace are studied. The thin wall parts are manufactured by optimizing the process parameters.
路桥潘, 张安峰, 李涤尘, 朱刚贤, 同治强, 付伟. 载气式同轴送粉喷嘴的数值模拟及实验研究[J]. 中国激光, 2010, 37(12): 3162. Lu Qiaopan, Zhang Anfeng, Li Dichen, Zhu Gangxian, Tong Zhiqiang, Fu Wei. Numerical Simulation and Experimental Research on Gas-Carrier Coaxial Powder Nozzle[J]. Chinese Journal of Lasers, 2010, 37(12): 3162.