Ti6A14V钛合金高速切削试验与有限元建模

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。

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

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 Ti6AI4V.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.