剛塑性有限要素法によるβ黄銅単結晶の切りくず生成機構の解析

Abstract

The subject of this study is to elucidate cutting mechanism in single crystal materials by numerical simulation. The chip formation mechanism in single crystal cutting of β-brass, which exhibits the characteristics of bcc metals, is investigated by rigid-plastic FEM (Finite Element Method) simulation. The plastic anisotropy of single crystal is introduced in the algorithm of the rigid-plastic FEM by applying the maximum plastic work principle. The chip formation process of single crystal of β-brass is simulated from the initial state to the steady state. The changes of cutting mechanism due to crystallographic orientation such as chip morphology and shear angle are appropriately simulated. In the simulation, the shear angle changes from about 17° to 57° according to the crystallographic orientation. The simulated results are compared with cutting experiments which have been done by in-situ SEM (Scanning Electron Microscope) observation technique. The simulated results are in good agreement with the experimental results in terms of the chip morphology and the shear angle.