多轴数控加工刀具姿态优化及其刚度性能指标分析  

Tool-Posture Optimization and Stiffness Index Analysis for Multi-axis NC Machine Tools

作　　者：闫蓉[1] 彭芳瑜[1] 李斌[1] 陈吉红[1] 

机构地区：[1]华中科技大学国家数控系统工程技术研究中心,武汉430074

出　　处：《中国机械工程》2008年第22期2699-2702,共4页China Mechanical Engineering

基　　金：国家重点基础研究发展计划资助项目(2005CB724101);武汉市青年科技晨光计划资助项目(20065004116-08)

摘　　要：在变形叠加基本原理的基础上,对多轴数控机床刚度模型进行了研究,得到了多轴数控加工刀具姿态优化的物理约束条件。在被加工复杂曲面刀具轨迹上,根据多轴机床综合刚度模型计算机床刚度性能指标,并在刀具可达工作空间中优化多轴机床刚度性能指标,以确定对应的刀具姿态。对基于多轴机床刚度模型的刀具姿态优化作了详细的讨论,分析了任务空间的力椭球特性,提出了面向切削加工的多轴机床刚度性能指标,并将其用于指导刀具姿态规划。Based on the superposition principle of small deflections, general stiffness model for multi--axis series machine tool was established as physical constrains for tool posture optimization. On the sculptured surface to be machined, stiffness index of multi--axis machine tool was computed by general stiffness model. Then optimized stiffness index of multi--axis machine tool was used to determine tool posture in the available workspaee. Tool posture optimization based on general stiffness model for multi--axis machine tool was discussed in detail, in which the characteristic of force ellipsoid in task space was analyzed and machining--oriented stiffness index for multi--axis machine tool was originally developed for tool--posture planning.

关 键 词：多轴数控机床 刚度 刀具姿态 力椭球 

分 类 号：TP242.2[自动化与计算机技术—检测技术与自动化装置]