表面处理对柔轮材料力学性能影响的有限元分析

Finite element analysis on influence of surface treatments on mechanics of flexible gear material

以柔轮常用15-5ph不锈钢为对象,研究不同表面处理工艺对柔轮材料力学性能的影响规律。利用纳米压痕仪开展15-5ph不锈钢试件压入实验,将得到的载荷-深度曲线与有限元模拟结果进行对比,验证有限元压入模型的有效性。在此基础上,开展常见表面处理工艺影响柔轮材料力学性能的有限元建模与分析。研究结果表明:涂层弹性模量的增加将提高涂层-基体系统的等效硬度及刚度;渗碳层厚度的适当增大可减小柔轮基体应力而不影响柔轮的啮合精度;由喷丸产生的残余压应力越大,基体材料等效硬度越大,并可带来材料等效刚度的一定提高。

The influence of different surface treatment processes on the mechanics of 15-5ph stainless steel,which is commonly used for flexible gear,was studied.Firstly,a 15-5ph stainless steel specimen was tested by a nano-indentation tester.The obtained load-displacement curve was compared with that simulated by finite element method,verifying the effectiveness of the indentation model established by the finite element method.Based on the above results,the influence of different surface treatments on the flexible gear material was modeled and analyzed.The results show that increasing coating’s elastic modulus can increase the equivalent hardness and stiffness of coating-matrix system;and that increasing carburizing layer thickness appropriately reduces the stress of flexible gear matrix without affecting engage precision.If the residual compressive stress caused by shot peening becomes larger,the equivalent hardness of the matrix material gets larger,and in the meanwhile,the equivalent stiffness will be improved to some extent.