基于速度合成原理的定位误差新算法  

A New Algorithm for Locating Error Based on Velocity Composition Law

作　　者：吴竹溪[1] 秦国华[1] 鲁宇明[1] 

机构地区：[1]南昌航空大学航空与机械工程学院,江西南昌330063

出　　处：《测试技术学报》2009年第1期7-13,共7页Journal of Test and Measurement Technology

基　　金：国家自然科学基金资助项目(10676028);航空支撑制造技术研究基金资助项目(61901090104);江西省教育厅科学技术研究基金资助项目(2007-172);南昌航空大学科研基金资助项目(EA200503139)

摘　　要：夹具是联系机床、刀具与工件的重要桥梁,其设计质量对加工精度起着至关重要的影响.定位误差则是评价夹具设计质量的重要指标.然而,目前还没有一种适用于所有定位方案定位误差的计算方法,从而使得计算机辅助夹具设计系统很少涉及尺寸和公差的分析.为此,基于质点运动的速度合成原理,首先建立了线性尺寸的定位误差通用模型及其算法.然后基于线速度与角速度之间的关系,推导了角向尺寸的定位误差通用模型及其算法.最后利用典型实例详细讨论了定位误差通用计算方法的应用过程.The fixture is an important bridge to link the machine tool, the cutter and the workpiece. Therefore, the design quality of the fixture strongly influences the machining accuracy of the workpiece. Locating error is a crucial index to evaluate the design quality of the fixture. However, up to now, a general method to locating error analysis hasn＇t been formulated so that the dimensioning and tolerance analysis are omitted in computer aided fixture design system. Therefore, based on the velocity composition law of particle movement, a mathematical model and its algorithm for the locating error are firstly established to analyze the linear dimension. Secondly, on the basis of the relationship between the linear velocity and angular velocity, another mathematical model and its algorithm for the locating error are also formulated to verify the angular dimension. A typical example is finally used to demonstrate the proposed approach in detail.

关 键 词：定位方案 定位误差 速度合成原理 线速度 角速度 

分 类 号：TG75[金属学及工艺—刀具与模具]