正交切削变形区的研究

A Study of Deformation Zone in Orthogonal Metal Cutting

本文对正交切削过程的力学边界条件提出合理的假设,用滑移线场理论建立了考虑切削刃钝圆影响的切削变形区模型。根据滑移线场运动学可容条件的要求,推论出在第一变形区与第二变形区之间及第一变形区与第三变形区之间存在着另外两个变形区。本文指出:已加工表面后流现象是由负后角参加切削造成的;切削刃钝圆一般能使切屑卷曲半径增大。通过对速度场的分析,证明所建立的滑移线场不仅满足静力学的可容性,而且也满足运动学的可容性。

In this paper, by making reasonable assumptions about the mechanical boundary conditions of orthogonal cutting, a cutting model is constructed by slip-line field theory, in which the influences of cutting edge roundnesses are considered. It's deduced that besides the three deformation zones, other two deformation zones must exist according to the kinematical admissibilities of the constructed slip-line field. It's pointed out that the 'baek-flow' on the machined surface is caused by the existence of negative clearance angles. The cutting edge roundness can make chip curling radii larger. By analysing the velocity fields, the constructed slip-line field meets not only the needs of the statical admissibilities but also the needs of kinematical admissibilities.