铁路车辆车钩再制造激光表面熔覆温度场有限元分析  

Temperature Field FEM Analysis of Laser Surface Cladding in Railway Car Coupler Remanufacturing

作　　者：刘长毅[1] 仇卫华[1] 田威[1] 

机构地区：[1]南京航空航天大学机电学院,江苏南京210016

出　　处：《应用激光》2008年第6期464-469,共6页Applied Laser

摘　　要：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 a remanufacturing techneque being used in the fields of parts hardening, modification, repair, and so on. This paper emphasises on the application of laser surface cladding on the remanufacturing of railway vehicle coupler which is typical parts easy to wear. Temperature field of coupler laser surface cladding is simulated with FEM （Finite Element Method）. Relevant processing in FEM analysis of laser surface cladding, including heat source model, the latent heat of phase transformation, meshing, was researched. The pre-plaeed cladding and synchronization powder feeding cladding are simulated and analyzed, as well as the comparison of the law of their temperature field changes. Then, the difference of cladding hole surface with oblique laser beam angles was compared. The simulation results accord with the basic law of laser surface cladding can be used to predict and optimize process parameters of laser surface cladding in the coupler remanufacturing.

关 键 词：激光表面熔覆 温度场 有限元法 再制造 车钩 

分 类 号：TG156.99[金属学及工艺—热处理] TH16[金属学及工艺—金属学]