薄壁构件镜像加工支撑机构综合刚度的分析与优化  

Synthetical Stiffness Analysis and Optimization of Mirror Support Mechanism for Thin-walled Structures

作　　者：郝金明[1] 赵勇[1] 王皓[2,1] 盛东义[1] 

机构地区：[1]上海交通大学上海市复杂薄板数字化制造重点实验室,上海200240 [2]上海交通大学机械系统与振动国家重点实验室,上海200140

出　　处：《机械设计与研究》2015年第2期155-159,163,共6页Machine Design And Research

基　　金：国家自然科学基金资助项目(51305256);973计划(2014CB046600)

摘　　要：薄壁构件的工件刚度随着装夹布局的变化而变化,在构件的不同位置,其刚度也是变化的。镜像加工装备是针对薄壁构件加工而设计的一种新型加工装备,其支撑机构可以起到对系统刚度的调节作用,支撑机构和工件的综合刚度变化越小,加工精度一致性越高。针对自主设计的新型镜像支撑设备,建立了镜像支撑机构和工件的刚度模型,计算了综合刚度在加工表面的分布,并通过增加冗余驱动的方式优化综合刚度,结果表明优化后的整机平均支撑刚度提高大约1倍,综合刚度最小值提高37.6%,且分布更加均匀。The stiffness of thin-walled structure is changed,not only with the differeal fixture layout but also with the different machining position. Mirror machining device is a kind of new machining device which is designed to improve the machining precision of thin-walled structures,because the support mechanism can adjust the system stiffness. The smaller the synthetical stiffness of the support mechanism and workpiece is,the higher the consistency of machining precision is. A new designed mirror machining device is introduced in this paper and both the stiffness of support mechanism and the workpiece are analyzed. The distribution of the synthetical stiffness is obtained from the stiffness model and improved by adding redundant actuation. The results show that the stiffness of the support mechanism is increased by about 1 time compared to that before optimization. The minimum synthetical stiffness is improved by37. 6%,and its distribution is more homogeneous.

关 键 词：镜像支撑 刚度分析 冗余驱动 刚度优化 

分 类 号：TH113[机械工程—机械设计及理论]