中文摘要：

通过运用建立的倒棱PCBN刀具切削淬硬轴承钢GCr15热力耦合有限元模型,研究了锯齿形切屑形成过程中,倒棱角度对切削力和切削温度分布的影响规律。通过切削实验对有限元结果进行验证,发现二者具有较好的一致性。研究结果表明：随着倒棱角度的增大,主切削力和径向力增大,径向力增加尤为显著,整个切削过程中径向力都小于主切削力。切削温度随着倒棱角度的增大也逐渐增大,最高切削温度位于切屑和倒棱刃口接触表面上距离刀尖0.1—0.15mm处。锯齿形切屑产生导致切削力周期性变化。

英文摘要：

Based on the coupled mechanical-thermal FEM model built for hardened steel GCr15 machined by chamfered PCBN cutting tools, the effect of chamfer angle on cutting force and cutting temperature distribution in the process of saw-tooth chip form were investigated. The results of FEM simulation were testified by cutting experiments, and it is found that both of them are in good accordance. The research results indicate that with the enlargement of chamfer angle the radial force and the main cutting force increase, the radial force rises more significantly but less than the main cutting force during the entire process. As the chamfer angle increases, cutting temperature also gradually rises, and moreover, it is maximized on the chip-tool interface in a place of about 0. 1-0.15 mm from the nose. The formation of saw-tooth chip results in periodical change of cutting force.