QMB125球笼沟道磨床几何误差建模与敏感度分析

Geometric Error Modeling and Sensitivity Analysis of QMB125 Ball Cage Grinder

机床的加工精度受诸多方面的误差因素的影响,而组成机床的误差主要包括热、力、几何、运动误差等,其中机床部件的几何误差对球笼沟道床的加工精度有着举足轻重的作用。以QMB125数控磨床为研究对象,基于多体系统理论,通过低序体阵列来描述磨床的拓扑结构,对磨床的27项几何误差源进行误差取样检测,建立起机床的运动学模型,进而计算出各个误差源的敏感度系数来找出影响程度较高的几何误差项,为合理经济的提高机床精度提供有效依据。

The machining accuracy of the machine tool is affected by many error factors and the errors that make up the machine tool mainly include heat,force,geometry,motion error,etc. Among them,the geometric error of the machine tool components plays an important role in the machining accuracy of the cage channel bed. The QMB125 CNC grinding machine is taken as the research object. Based on the multi-body system theory,the topological structure of the grinding machine is described by low-order body array. The error sampling of 27 geometric error sources of the grinding machine is carried out to establish the kinematics model of the machine tool. Then calculate the sensitivity coefficient of each error source to find the geometric error terms with higher degree of influence,it provides an effective basis for improving the accuracy of machine tools in a reasonable and economical way.