考虑应力叠加的矫直行程预测模型研究  

Research on straightening stroke prediction model considering stress superposition

作　　者：卢红[1] 张永权[1] 高圣[1] 凌鹤[1] Lu Hong Zhang Yongquan Gao Sheng Ling He(School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, Chin)

机构地区：[1]武汉理工大学机电工程学院,湖北武汉430070

出　　处：《华中科技大学学报（自然科学版）》2016年第9期65-70,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51275372);湖北省自然科学基金资助项目(2013CFB353);中央高校基本科研业务费专项资金资助项目(165104008)

摘　　要：为提高精密矫直加工精度及效率,探讨多次矫直过程中应力叠加特性,研究多次矫直行程预测迭代建模方法.首先,基于经典弹塑性变形理论,建立单次矫直行程预测理论模型;运用应力叠加原理,研究二次矫直的截面应力分布状态,推导出二次矫直时截面应力的再分布方程及矫直参数解析表达式;在此基础上,研究多次矫直过程中的矫直次数-应力演变规律,建立考虑应力叠加的多次矫直行程预测迭代模型.采用自主研发的精密矫直机进行在线矫直实验,进行行程预测模型实验对比.实验结果表明:实际矫直过程中,多次矫直行程预测迭代模型的预测精度和矫直效率优于未考虑应力叠加作用的单次矫直行程预测理论模型,该方法可推广应用于直线金属条材的精密矫直中.In order to improve the precision and efficiency of precision straightening,the stress super-position characteristics of multiple straightening and an iterative modeling method of multiple straight-ening stroke prediction were researched.Above all,a theoretical stroke prediction model of single straightening was established based on the classical elastic-plastic theory.Then,the stress superposi-tion theory was applied to study on the section stress distribution and derive the redistribution equa-tion of the section stress and the analysis formula of straightening parameters by the second straighte-ning.On the basis of the analysis,the law between stress evolution and straightening time was inves-tigated during multiple straightening processes and an iterative stroke prediction model of multiple straightening was established considering stress superposition.An online experiment was made to compare above stroke prediction model by the precision straightening machine.It is shown that the precision and efficiency of an iterative stroke prediction model of multiple straightening considering stress superposition is higher than of a theoretical stroke prediction model of single straightening. This method can be applied to the precise straightening of linear metal bar.

关 键 词：矫直 应力分布 行程预测 应力叠加 迭代建模 预测精度 

分 类 号：TH16[机械工程—机械制造及自动化]