振动切削参数对纳米振动切削过程的影响

Effect of vibration Cutting Parameters on Nano-vibration Cutting Processs

采用分子动力学的方法建立了金属钛的纳米振动切削模型,通过切削仿真研究了振动切削参数变化对整个振动切削过程的影响。研究发现:振动频率和振幅的增大会使接触率、切削力及切削温度的数值减小。切削速度增大会使接触率、切削力及切削温度升高,相比对切削力的改变,在切削速度小于100m/s的情况下对切削温度的影响效果更显著。刀具刃口半径的增大会使切削过程中已加工面的变质层厚度增加,表面粗糙度增大,切削力与切削温度的数值随刃口半径的增大而增加,当刃口半径跟切削厚度之比大于1时,背吃刀力及切削温度提升的速率更快。

Molecular dynamics（MD） method was used to establish titanium nano-vibration cutting model,and the influence of vibration cutting parameters on the whole vibration cutting process was studied by cutting simulation.Study found：The increase of vibration frequency and vibration amplitude will decrease the contact rate,cutting force and cutting temperature.The contact rate,cutting force and cutting temperature can be increased with the increase of the cutting speed.When the cutting speed is less than 100m/s,the influence of the cutting speed on the change of cutting temperature is more remarkable than the change of cutting force.The increase of tool edge radius will increase the thickness of the affected layer,increase the roughness of the machined surface,and the cutting force and the cutting temperature increase with the increase of the tool edge radius.When the ratio of the tool edge radius and the cutting thickness is greater than1,which will cause the normal force and cutting temperature rise faster.