倒角刀刃切削过程中切削力的有限元法预测

提出了一个预测倒角刀刃切削过程中切削力大小的有限元分析模型．综合考虑了切削加工过程中大应变、大应变速率和高温对工件材料属性的影响，将工件材料的流动应力看成是应变、应变速率和温度的函数．模拟过程从刀具切入工件开始，到切削力达稳态为止．切屑的分离通过商业有限元分析软件Marc中的自适应网格重划分功能实现．采用不同切削条件下切削力的测量结果对有限元分析结果进行验证，发现二者具有较好的一致性．文申最后还分析了刀刃的几何参数对切削力的影响．

Prediction of the Cutting Force of Chamfered Cutting Edge During the Cutting Process Using Finite Element Method

A finite element model was presented to predict the cutting force of chamfered cutting edge during the cutting process. The flow stress of the workpiece was taken as a function of strain, strain rate and temperature in order to take into account the effect of large strain, strain rate and elevated temperature on material properties. The cutting process was simulated from the initial to the steady state of cutting force. Chip separation was achieved by the function of the adaptive remeshing founded in commercial finite element code Marc. The proposed finite element model was verified experimentally for a range of cutting conditions and gave significantly better prediction of cutting forces. The effect of geometry parameters of the chamfered cutting edge on the cutting forces was also discussed.