钛合金铣削加工的切屑形态仿真及实验研究

为改善钛合金TC4可加工性、降低刀具磨损、提高工件表面质量,探寻刀具前角及切削速度的变化对切削力和切削温度的影响规律。通过改变刀具前角和切削速度,采用AdvantEdge FEM软件和单因素实验方法对钛合金TC4切屑的形成过程进行二维模拟,研究锯齿形切屑的形成机理。仿真与实验结果表明:随着刀具前角增大,切屑的锯齿化程度降低,切削力和切削温度呈下降趋势;随着切削速度的增大,切削力呈缓慢下降趋势,而切削温度呈明显上升趋势。该研究验证了仿真的可行性,为优化铣削钛合金TC4刀具几何参数及切削用量的合理选择提供了参考依据。

Research on simulation and experiment of chip morphology for milling titanium alloy

This paper is focused on the morphology simulation and experimental research which aim to eliminate the negative features inherent in TC4 titanium,such as poor workability and vulnerability to serious tip wear,which affect the surface quality of the workpieces. The simulation and research involve investigating the formation mechanism of serrated chips,based on two-dimensional chip simulation of chip formation process of TC4 titanium alloy,using the finite element software AdvantEdge FEM; using singlefactor experiments to subject the TC4 titanium alloy to finite element simulation which,in turn,comes into contrast with chip morphology derived from experiment so as to verify the feasibility of the simulation, as in the case of the changes in the rake angle and cutting speed; and identifying the law associated with the influence of change in rake angle and cutting rate on cutting forces and temperatures. The results show that an increased rake angle leads to less and less obvious serration,with an accompanying tendency towards a decrease in cutting force and cutting temperature; increased cutting speed is accompanied by a tendency towards a slow decrease in cutting force,but triggers a tendency towards an obvious increase in cutting temperature. The study may provide a reference for the optimization of the geometry parameters associated with milling of TC4 titanium alloy and a reasonable choice of cutting parameters.