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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。
Considering the influence of tool fillet and Merchant model and high-speed orthogonal cutting Ti6AI 4V experimental measurement of cutting force and chip geometrical parameters, the “chip-tool-workpiece friction coefficient was obtained. The calculation shows that the friction coefficient of ”tool-workpiece“ is about three to seven times that of ”tool-chip“, and the research overcomes the problem of ”chip-tool-workpiece" friction coefficient Blindness. Based on the friction relationship, a finite element model of high speed titanium alloy (FEM) is established. The error of the simulation cutting force is less than 4.9% compared with the experimental value. The error between the saw tooth pitch, saw tooth height and the shear angle and the test value is less than 5.2%. The finite element model of titanium alloy high speed cutting has been validated.