圆锥滚子定姿态贯穿式超精研油石磨刃分析

摘要

Based on the contact geometry characteristics of taper roller and oilstone in the superfinishing process and the grinding principle,the mathematical models including the model of number of dynamically effective cutting edges per unit area and the model of number of dynamically effective integral cutting edges are established.The models and their parameter estimation are simulated with MATLAB.The influence of key elements on dynamically effective cutting edge distribution is analysed.The changing radius of the tape roller in the superfinishing region is the principal factor that causes the dynamical variation of number of cutting edges.Because of the influence of the radial contact arc length between tape roller and oilstone,the dynamically effective cutting edge distribution per unit area and the dynamically effective integral cutting edge distribution are different.The oilstone oscillation frequency obviously influences the integral cutting edge.With the fact that the contact area between tape roller and oilstone changes with the grinding depth considered,an ideal cutting edge distribution can be obtained.%基于超精研过程中圆锥滚子与油石接触的几何特点及磨削原理,建立数学模型包括单位面积动态有效磨刃数模型和整体动态有效磨刃数模型,估计参数取值并用MATLAB运行模型,分析关键因素对磨刃分布的影响.超精研区不断变化的滚子半径是引起磨刃数动态变化的主要因素;受到滚子与油石径向接触弧长的影响,单位面积动态有效磨刃分布与整体动态有效磨刃分布完全不同;油石振荡频率对整体磨刃分布的影响最明显.若考虑磨削深度随滚子与油石接触面积的变化而变化,可以得到理想的“对号”形磨刃分布.