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针对斜齿轮轴齿面激光熔覆层的开裂问题,采用数值计算的方法对其开裂倾向进行了分析,分析结果表明:齿根部位产生了较大的温度梯度,而齿面熔覆层内呈明显的拉应力状态,且主要集中在齿根部位,齿根部位的熔覆层将成为开裂的薄弱部位;裂纹发展的趋势将由齿根部位萌生,然后向其表面扩展然后向齿顶方向延伸。在双向扫描工艺条件下,轮齿内部的温度分布更加均匀,而熔覆层内拉应力水平明显降低,并在一定程度上减轻了齿根部位的应力集中问题,有利于控制熔覆层的开裂倾向。采用两种扫描方法和熔覆参数进行组合,对斜齿轮齿面进行了熔覆试验,试验结果表明:双向扫描工艺对于齿面熔覆层开裂具有一定的抑制作用,并最终获得了适合齿面熔覆的工艺和参数。
In order to solve the cracking problem of helical gear tooth surface laser cladding layer, the cracking tendency of the laser cladding layer was analyzed by numerical calculation. The results showed that there was a large temperature gradient in the tooth root area, Obvious tensile stress, and mainly concentrated in the tooth root. The cladding in the tooth root will become the weak part of cracking. The trend of crack development will be initiated by the tooth root and then extended to the surface and then extended to the tooth top. Under the condition of bidirectional scanning, the temperature distribution inside the tooth is more uniform, and the tensile stress level in the cladding is obviously reduced, and the problem of stress concentration in the tooth root is relieved to a certain extent, which is good for controlling the cracking of the cladding tendency. Two kinds of scanning methods and cladding parameters were combined to testify the helical gear tooth surface. The experimental results show that the bidirectional scanning technique has a certain inhibition effect on the delamination of the tooth surface cladding layer, and the suitable tooth surface Cladding process and parameters.