高速金属切削的摩擦分析及有限元模拟

基于更新的拉格朗日方程,模拟了高速条件下金属正交切削的加工过程,并在刀-屑接触表面上分别建立了库仑摩擦模型和粘结-滑移摩擦模型,通过将切削力、吃刀抗力、切屑厚度和刀-屑接触长度的模拟预测值与相关文献的试验结果比较表明,粘结-滑移摩擦模型更符合实际的摩擦模型,即在金属切削过程中,刀-屑接触表面上同时存在滑移摩擦和粘结摩擦。

Friction Analysis and Finite Element Simulations of High-speed Metal Cutting

Based on the updated Lagrangian finite element formulation,the simulations of orthogonal metal cutting were conducted under high speed condition.The Coulomb friction model and sticking-sliding friction model were built up respectively on the tool-chip interface.The predictions of cutting force,thrusting force,chip thickness,tool-chip contact length were given in the simulations.According to the comparisons with experimental data,the sticking-sliding friction model is found to be closer to the true model.It is shown that the sliding and the sticking friction exist simultaneously on the tool-chip interface during the metal cutting.