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对某汽轮机滑油泵转子的斜齿轮轴齿面的激光熔覆过程进行了研究,利用有限元软件ANSYS对其温度场进行了数值分析。结果表明,在齿面激光熔覆过程中,激光能量输入产生的热量大量集中在轮齿内部,且在熔覆层与齿根结合部位等温线分布比较密集,导致在轮齿内部出现较大的温度梯度,且激光输入产生的热量可对相邻轮齿产生预热的效果;计算结果还表明,越靠近齿顶,等温线越深入基体,若将轮齿的侧面和顶部同时熔覆,极易造成齿顶的过度熔化而塌陷。根据计算结果,提出了齿侧与齿顶分步熔覆的工艺,通过实际熔覆实验,在轮齿表面获得了连续、完整的熔覆层。
The laser cladding process of helical gear tooth surface of a steam turbine oil pump rotor was studied. The temperature field was analyzed by finite element software ANSYS. The results show that during the laser cladding, the heat generated by laser energy input is mainly concentrated in the tooth, and the isotherms are more dense at the bonding layer and the tooth root, resulting in a larger Temperature gradient and the heat generated by the laser input can preheat the adjacent gear teeth. The calculation results also show that the closer to the tooth top, the deeper the isothermal line is in the matrix. If the side and the top of the gear tooth are covered simultaneously, Easy to cause excessive melting of the top of the tooth and collapse. According to the calculation results, a step-by-step cladding technique of tooth flank and tooth tip is proposed. Through the actual cladding experiment, continuous and complete cladding layer is obtained on the tooth surface.