基于控制磨削前角的金刚石研磨损伤分析

Damage analysis of diamond grinding based on controlling the grinding rake angle

为解决金刚石材料亚表层损伤难以检测的问题,基于分子动力学理论和方法,建立了金刚石双磨粒磨削的三维仿真模型进行分析,研究磨粒不同磨削前角参数对磨削力和材料损伤的影响规律。仿真分析结果表明:增大磨削前角可以减小磨削力,但法向磨削力受到的影响更加明显;负前角磨削的平均摩擦系数更小,更容易实现金刚石原子的去除;负前角磨削下的金刚石材料亚表层损伤起伏偏大,增大磨削前角可以减小亚表层损伤的起伏变化,改善亚表层损伤。

In order to solve the problem that subsurface damage of diamond material is difficult to detect,this paper is based on molecular dynamics theory and method.A three-dimensional simulation model of double grits grinding is established for analysis,and the influence of different grinding rake angle on grinding force and material damage is studied.The simulation analysis results show that grinding force can be reduced by increasing the grinding rake angle,and the influence of normal grinding force is more obvious.The average coefficient of friction of negative grinding rake angle is smaller,which makes it easier to achieve the removal of diamond atoms;The subsurface damage of the diamond material under negative grinding rake angle grinding is larger.The undulating change of subsurface damage can be reduced and the subsurface damage can be improved by increasing the grinding rake angle.