考虑切削条件变化的刀屑摩擦因数反求方法

An Inverse Approach to Determine Tool-chip Friction Coefficient by Considering Variation of Cutting Conditions

基于Advant Edge FEM分析了刀屑摩擦因数对工件已加工表面残余应力仿真的影响,提出了一种利用有限元仿真实验数据建立切削力与刀具几何参数(前角、钝圆半径)、切削用量和刀屑摩擦因数之间关系的经验模型,从而通过切削力的实验值来反求刀屑摩擦因数的方法,以提高工件残余应力分布的有限元仿真精度。仿真实验结果表明,与软件默认的摩擦因数和平均库仑摩擦因数相比,用文中方法所求得的摩擦因数仿真得到的车削45钢工件的残余应力分布与实验结果更为接近。

By analysis of the influence of tool？chip friction coefficient on residual stresses simulations at the surface of machined workpiece based on AdvantEdge FEM, an inverse approach to determine tool？chip friction coefficient is proposed by combining the measured cutting forces with the established empirical model of cutting forces with tool geometry parameters, cutting parameters and friction coefficient, in order to improve the accuracy of the simulated residual stress distribution. The simulation experimental results show that, compared with the AdvantEdge FEM default friction coefficient and average coulomb friction coefficient, the residual stresses simulated with the proposed calculated friction coefficient of turning 45# steel workpiece are in better agreement with the experimental data.