转镜参数对送粉式激光熔覆工艺过程的影响

Effects of Tilting Mirror Parameters on Powder Feeding Laser Cladding Processing

关键词:  转镜参数  激光熔覆  送粉  组织

Key words:  tilting mirror parameter  laser cladding  powder feeding  structure

摘要:

从理论上分析了激光熔覆光源的形成原理及转镜参数对光源能量分布的影响,结果表明,在其它条件不变的情况下,随着转镜棱数m增加,激光熔覆光源长度减小;而转镜转速n越高,激光熔覆光源的能量分布越均匀。通过对不同转速条件下获得试样的金相组织、熔覆层尺寸和熔覆层硬度的分析测试,试验结果表明,熔覆层不同区域的组织形态随转镜转速的变化均有所变化;熔覆层宽度和厚度随转镜转速的增加而增大;熔覆层硬度随转镜转速的增加虽略有下降,但影响不大。

Abstract:

The formation principle of laser cladding source and effect of tilting mirror parameter on the distribution of source energy are analyzed in theory,and the results show that:when the other conditions keep constant,the length of laser cladding source decreases with the add of number of laser prismatic face(m);and the higher rotation rate of tilting mirror(n) is,the more unitorm distribution source will be gotten.The different specimens which had been gotten under different rotation rates were analyzed and measured about the microscopic structures,the sizes of laser cladding and the hardness of cladding layer,and the results show that:the microscopic structure varied with the change of rotation rate of tilting mirror in different area of cladding lager; the width and thickness are increased by the increase of rotation rate of tilting mirror; the hardness of cladding layer is decreased slightly by the increase of rotation rate of tilting mirror.