基于有限元法分析超精密切削中的摩擦问题

基于更新的拉格朗日公式,建立了热-机械耦合的平面应变大变形正交切削模型.根据此模型,对金刚石车削过程中的摩擦问题进行了仿真研究.对两种摩擦模型仿真所得的切削力与实验数据进行了比较,验证了前刀面上的摩擦状态应是粘结-滑移摩擦同时存在,并研究了刀具摩擦系数各向异性对超精密切削中切屑变形、切削力、剪切角的影响.

Analysis on the Friction in Ultra- precision Turning Based on Finite Element Method

A coupled thermo-mechanical plane strain larger deformation orthogonal cutting model is developed on the basis of updated Lagrangian formulation in this paper. According to this model,the frictional problems in diamond turning are simulated. Firstly,the simulated cutting forces with two friction models are compared with experiment data,and the results testify that the sticking and sliding exist at the interface between the tool and the chip at the same time. Secondly,the influences of frictional coefficient anisotropy of the diamond tool on chip's deformation,cutting forces and shear angle are investigated with finite element simulation respectively.