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激光表面熔覆作为一种再制造技术手段被应用于零件表面的修复和强化。针对以激光表面熔覆为主要工艺的铁路货车易磨损零部件车钩的再制造,以有限元方法模拟熔覆过程中熔覆区和基体的温度场。在研究激光表面熔覆数值模拟的热源模型、相变潜热以及网格划分等相关技术的基础上,模拟分析激光束与圆柱內孔表面不同夹角时,预置式激光熔覆和同步送粉式激光熔覆温度场变化,进行对比。模拟结果符合激光表面熔覆的基本规律,可应用于车钩再制造过程中的激光表面熔覆工艺的预估与设计。
Laser surface cladding is used as a remanufacturing technique to repair and reinforce parts surfaces. Aiming at the remanufacturing of the coupler of the wear parts of railway wagons with the laser cladding as the main process, the temperature field of the cladding zone and the matrix in the cladding process is simulated by finite element method. Based on the research on the heat source model, the latent heat of phase transformation and the meshing technology of the laser surface cladding numerical simulation, the laser cladding and the simultaneous powder feeding Laser cladding temperature field changes, compared. The simulation results accord with the basic rules of laser surface cladding and can be applied to the prediction and design of the laser cladding process during the remanufacturing of the coupler.