钛合金TC21车削过程的三维数值建模与试验研究

针对一种新型高强度钛合金材料TC21钛合金难加工的特点,建立了车削过程的三维有限元模型。采用建立的三维车削有限元模型对钛合金材料TC21的切屑成形过程进行了数值模拟,并获得了切削过程的切削力变化曲线及应力值等物理量。同时,通过钛合金TC21的车削试验研究了刀具前角、进给速度及主轴转速对切削过程的影响规律。在相同切削条件下对试验结果与数值模拟进行了对比,结果验证了数值模拟的可靠性。实验结果表明,钛合金材料TC21的切屑也是锯齿状,且随着刀具前角的减小,TC21材料切屑锯齿状形态越明显。

Study on 3D Numerical Modeling and Experiment of Titanium Alloy TC21 Turning Process

Aiming at the difficult machinability of a new higher strength titanium alloy TC21, the three dimensional (3D) finite element model (FEM) of turning process is established. The chip formation process was numerically simulated by the established model, and its physical data of changing curves of cutting forces and stress values were acquired. In addition, the effect of tool rake angle, feeding speed and rotational speed of spindle on the cutting process of titanium alloy TC21 were investigated by the cutting test. Under the same cutting conditions, the result of simulation was compared with that of the test, which verified its reliability. The test results prove that the chip in the turning of titanium alloy TC21 is serrated, and the serrated increased with the tool rake angle, and the shape of serrated is more obvious.