切削温度对微细切削加工影响的有限元分析研究

FEM Study of Effect of Cutting Temperature on Micro-cutting Process

建立微细切削仿真模型,对二维正交切削加工过程进行了热力耦合有限元数值分析,采用有限元模拟与微细切削加工实验验证相结合的方式,深入研究了切削温度对微细切削加工的影响,揭示了在高速、大切厚加工条件下,随着切削厚度的减小,刀—屑接触区切削温度降低,增加了材料的截切强度,从而引起材料的强化,导致单位切削力显著增加。

A coupled thermo-mechanical model is used to simulate two-dimensional orthogonal cutting process based on simulation model of micro-cutting.The effect of cutting temperature on micro-cutting process is studied deeply through FEM combined with micro-cutting experiments.The results indicate that cutting temperature decreases at the tool-chip interface with reduction in uncut chip thickness at high cutting speed and large uncut chip thickness.The temperature drop tends to have a hardening effect on the material strength,which in turn causes an increase in the specific cutting force.