金属棒材四点弯曲压力矫直行程预测模型研究  

Research on the Predictive Model of Pressure Straightening Stroke of Metal Bar Using Four-Point Bending

作　　者：魏钦玉 沈顺成[1] 卢红[1,2] 张永权 WEI Qin-yu;SHEN Shun-cheng;LU Hong;ZHANG Yong-quan(School of Mechanical and Electronic Engineering,Wuhan University of Technology,Hubei Wuhan430070,China;Hubei Digital Manufacturing Key Laboratory,Hubei Wuhan430070,China)

机构地区：[1]武汉理工大学机电工程学院,湖北武汉430070 [2]数字制造湖北省重点实验室,湖北武汉430070

出　　处：《机械设计与制造》2019年第10期87-90,共4页Machinery Design & Manufacture

基　　金：国家自然科学基金(51675393)

摘　　要：为改善工件矫直过程中的应力应变分布,提高精密矫直的精度,建立了金属棒材四点弯曲压力矫直行程预测模型。首先,基于三点弯曲压力矫直理论对矫直过程中金属棒材的弹塑性变形进行分析,推导四点弯曲压力矫直的弹塑性变形规律;其次,采用有限元模型进行四点弯曲压力矫直仿真分析;最后,采用自主研发的数控压力矫直机进行实验,将获得的实验结果与理论和仿真分析结果进行对比。结果表明:采用双压头双支撑结构的四点弯曲压力矫直方案在精度和工件变形上均优于三点弯曲压力矫直方案,可广泛应用于直线金属棒材精密矫直工艺。In order to improve the uniformity of stress-strain distribution and the accuracy of the straightening process,the four-point straightening approach of metal bar using dual indenter and dual support structure(DIDSS)is developed in it and the relevant predictive model of straightening stroke(PMSS)is established.Firstly,on the basis of three-point bending theory,the evolutional regularity of elastic-plastic regions using the DIDSS is analyzed to explore the bending properties of metal bar.Besides,the PMSS is established by material model,geometrical parameters of cross section and the obtained bending moment.The straightening process of metal bar using the DIDSS is simulated by the finite element method(FEM).Finally the proposed PMSS is experimentally validated on the straightening machine by DIDSS with different types of workpieces.The experimental results show that the precision and deformation of DIDSS are better than using three-point bending straightening.The method can be widely applied to linear metal precision bending straightening.

关 键 词：矫直 四点弯曲 行程预测 金属棒材 有限元分析 

分 类 号：TH16[机械工程—机械制造及自动化]