薄壁封闭环磨削回弹的建模与数值研究  

Modeling and Analyzing the Spring-back of the Thin Closed Ring with Cut after Grinding Process

作　　者：倪小丹[1] 龚金科[2] 刘金武[1] 高为国[1] 郭建新[1] 

机构地区：[1]湖南工程学院机械工程系 [2]湖南大学机械与汽车工程学院

出　　处：《农业机械学报》2007年第4期158-162,176,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：湖南省自然科学基金资助项目(项目编号:02jjy4034);湖南省教育厅科学研究项目(项目编号:03C131)

摘　　要：提出了卡环制造过程中磨削回弹的计算模型。根据卡环的精度和啮合力要求,设计了特殊制造工艺。考虑弯曲残余应力,对磨削工序进行力学分析,提出了磨削回弹弯矩、磨削回弹后搭叠长度和啮合力变化的计算模型;开发了卡环制造辅助工艺系统——Shuttle,对卡环磨削工序进行了模拟,并结合实验讨论了磨削前后曲率半径、啮合力和搭叠长度随余量的变化规律。研究表明:随着磨削余量的增加,试样磨削前的啮合力增加,而磨削回弹后的啮合力呈下降趋势;试样磨削前后的搭叠长度均呈下降趋势,并且试样截面惯性矩越大,磨削回弹后试样的搭叠长度下降速度越慢;在各工序阶段,试样的曲率半径有不同程度的增加。ring after grinding procedure during its manufacture. According to the demands on accuracy and joggling force to the thin ring, a special technology routine was designed. Then, by discussing the routine in mechanics based on rest stress brought by bending, the spring-back moment and the changes of the covered length and the joggling force after grinding were modeled, and a computer aided process planning system named Shuttle was developed and used in simulating the grinding procedure of ring. Finally, the effects caused by thickness of layer cut on such factors as the curvature radius, the covered length and the joggling force during grinding were discussed. The result showed that when the grinding allowance was applied from 0～0. 5 mm, the joggling force of samples increased before grinding, but declined after grinding, its covered length was downtrend during that, in addition, the bigger the inertia square of the ring section was, the slower declining of its covered length was, the curvature radius of the sample was climbing up at a different velocity during every process step.

关 键 词：薄壁封闭环 残余应力 磨削回弹 回弹弯矩 

分 类 号：TG580.6[金属学及工艺—金属切削加工及机床] TP391.9[自动化与计算机技术—计算机应用技术]