基于局部摩擦因数模型的切削力预测建模

基于局部摩擦因数模型分别建立前刀面摩擦区、切削刃钝圆区、后刀面摩擦区的受力预测模型，进而获得切削力预测值.以钨钼系高速钢（W6Mo5Cr4V2Al）刀具和20Cr2Ni4合金钢为研究对象建立直角切削实验，通过三向测力仪测量直角切削主切削力和切深抗力，并与预测切削力进行对比，数值基本吻合.分析了切削参数以及刀具前角对切削力大小的影响规律.结果表明切削力随切削速度和刀具前角的增加有减小的趋势，随着切削深度的增加明显增大. 

Predictive Modeling of Cutting Force Based on Local Friction Coefficient Model

Considering the friction of dull radius and the flank face at cutting edge, a new cutting force prediction model was established based on local friction coefficient model of steady-state orthogonal cutting. Mathematical stress analysis models were set up respectively for friction zones on rake surface, flank surface and cutting edge surface. A series of orthogonal cutting experiments were conducted with high-speed steel tool (W6Mo5Cr4V2Al) and 20Cr2Ni4 alloy steel. Primary cutting force and radial thrust force were detected by three-dimensional dynamometer. In the end, the effect of cutting speed, cutting depth and tool rake angle on the magnitude of cutting forces were analyzed. Results show that, the predicted cutting forces calculated from the prediction model are consistent with the test data. It turned out that cutting force has a slightly tendency to decrease with the increase of cutting speed and tool rake angle, significantly increased with the increase of cutting depth.