Ti6A14V钛合金高速切削试验与有限元建模

Ti 6Al 4V High-Speed Cutting Process Experiment and Finite Element Analysis

综合考虑刀具圆角影响的Merchant模型和高速正交切削Ti6AI 4V实验测量的切削力和切屑几何参数,解析求得了"切屑-刀具-工件"摩擦系数。计算表明"刀具-工件"摩擦系数约为"刀具-切屑"摩擦系数的3～7倍,该研究克服了现有文献中对"切屑-刀具-工件"摩擦系数取值的盲目性。基于该摩擦关系,建立钛合金高速切削有限元模型(FEM)。仿真切削力与试验值相比误差小于4.9%:锯齿间距、锯齿高度,及其剪切角与试验值误差均小于5.2%,钛合金高速切削有限元模型得到了有效性验证。

Using cutting forces and chip morphology parameters measured by high-speed orthogonal cutting of Ti6AI4V ,the Merchant model is adopted with considering the effect of tool round edge to analytically calculate chip- tool-work friction coefficients. It reveals that tool-work friction coefficient is 3 - 7 times larger than that between the toolchip. The analysis overcomes the ignorance of empircally adopting chiptoolwork friction coefficients regardless of machining conditions in literature. Based on the chiptoolwork friction coefficients, a FE model is established to simulate high speed cutting of Ti6AI4＂V. The results indicate that the errors of the predicted cutting force by the FE model are less than 4.9% ; and the predicted chip pitch, chip height and shear angle are less than 5.2% compared with the experimental data,which effectively validate the FE model.