Abstract

In the milling process of water chamber head, the service life of cemented carbide inserts is low, and inserts are prone to premature breakage and impact fracture. Dynamic cutting force is one of the main factors leading to insert failure. In this paper, a dynamic cutting force model is established based on the characteristics of asymmetric milling of water chamber head and the characterization of cutting area variables. By comparing the calculated value with the experimental value, the model can describe the change of dynamic cutting force. Through theoretical analysis and insert stress distribution simulation, it is found that under the impact load of cutting force, the radial tension stress between the compression zone and the stretching zone is the main reason for the insert to crack and break. The results of this paper provide reference for the study of carbide insert failure.

摘要

在水室头铣削过程中，硬质合金刀片的使用寿命低，刀片容易过早断裂和冲击断裂。动态切削力是导致刀片失效的主要因素之一。本文根据水室头不对称铣削的特点和切削面积变量的表征，建立了动态​​切削力模型。通过比较计算值和实验值，该模型可以描述动态切削力的变化。通过理论分析和刀片应力分布模拟发现，在切削力冲击载荷作用下，压缩区和拉伸区之间的径向拉应力是导致刀片开裂断裂的主要原因。