基于EDEM的激光熔覆粉末利用率仿真分析

Simulation and analysis on utilization ratio of laser cladding powder based on EDEM

针对现有同轴载气激光熔覆粉末利用率低的不足,设计环式同轴载气激光熔覆头,利用离散单元法对熔覆粉末在粉流道内的运动进行仿真分析,研究熔覆头喷嘴结构参数对粉末汇聚和利用率的影响规律。结果发现,粉流道夹角对粉焦距和汇聚性能影响较大,当夹角为36°时,粉末颗粒分布较为集中,熔覆头的粉末利用率达到最高48.5%。研究成果可为熔覆头结构设计提供理论依据。

In view of the low utilization ratio of cladding powder of the existing coaxial gas-carrying laser cladding, a ring-type coaxial carrier gas laser cladding head was designed, and the discrete element method was used to simulate and analyze the movement of cladding powder in the powder flow channel. The effects of the structural parameters of the cladding head’s nozzle on powder concentration and utilization ratio were studied. Results show that the inclination angle of the powder channel has great impact on the focal length and the concentration of the powder. When the angle was 36°, the distribution of powder particles was concentrated, and the powder utilization rate of the cladding head reached a maximum of 48.5%. The research results provide a theoretical basis for the design of the cladding head structure.