Abstract:

Considering the irregular geometry,inconsistent size and random distribution of abrasive grains on wheel surface,abrasive grain in the shape of
irregular polyhedron was modeled by the method of cutting entity with random section
plane.Their geometric features were similar to real abrasive grains.A virtual lattice method was proposed to realize the random space distribution of abrasive grains.
Simulation model of grinding wheel topography was built.Grinding process of grinding
wheel topography was simulated by finite element method and smoothed particle
hydrodynamics.Chip mechanism of single abrasive grain and generating mechanism of
workpiece surface were analyzed according to the motion situation of smoothed particles
in cutting layer. 

Key words: vitrified bonded CBN wheel, wheel topography, FEM, smoothed particle hydrodynamics

摘要：

针对砂轮表面上磨粒形状的不规则性、尺寸的不确定性以及分布的随机性特点,采用随机空间平面切分实体的方法生成了具有实际磨粒几何特征的不规则多面体磨粒;提出了虚拟格子法,实现了磨粒空间位置的随机分布,构建了陶瓷CBN砂轮地貌仿真模型;采用有限元法和光滑粒子流体动力学法的耦合方法进行了砂轮地貌模型磨削仿真，通过切削层SPH粒子的运动情况，分析了磨粒的切削机理及工件表面的创成机理。
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关键词: 陶瓷CBN砂轮, 砂轮地貌, 有限元法, 光滑粒子流体动力学法