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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。
The influence of chamfer angle on cutting force and cutting temperature distribution was studied by using the established chamfered PCBN tool to cut the GCr15 thermal coupled finite element model of the hardened bearing steel. Finite element results were verified by cutting experiments and found that the two have a good consistency. The results show that with the increase of chamfer angle, the main cutting force and radial force increase, and the radial force increases more obviously. The radial force is smaller than the main cutting force during the whole cutting process. As the chamfering angle increases, the cutting temperature also increases gradually. The maximum cutting temperature is between 0.1-0.15mm from the tool tip on the contact surface between the chips and chamfer edge. Serrated chip generation leads to periodic changes in cutting forces.