焊管冷弯回弹曲线方程构建及工艺优化  

Construction of Springback Curve Equation and Process Optimization of Welded Pipe during Cold Bending

作　　者：赵月伟 帅美荣[1] 楚志兵[1] 桂海莲[1] 赵晓东[1] 高虹 邬莉华 翟丽丽 ZHAO Yue-wei;SHUAI Mei-rong;CHU Zhi-bing;GUI Hai-lian;ZHAO Xiao-dong;GAO Hong;WU Li-hua;ZHAI Li-li(Engineering Research Center of Heavy Machinery of the Ministry of Education,Taiyuan University of Science and Tech-nology,Taiyuan 030024,China;Wujin Stainless Steel Co.,Ltd.,Jiangsu Changzhou 213111,China;Sinosteel Stainless Steel Pipe Technology(Shanxi)Co.,Ltd.,Taiyuan 030600,China)

机构地区：[1]太原科技大学重型机械教育部工程研究中心,太原030024 [2]武进不锈股份有限公司,江苏常州213111 [3]中钢不锈钢管业科技山西有限公司,太原030600

出　　处：《精密成形工程》2022年第7期98-105,共8页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金(U1710113);常州市领军型创新人才引进培育项目(CQ20200042);山西省重点研发计划(201903D121043);山西省研究生教育改革研究课题(2020YJJG241)。

摘　　要：目的研究316L奥氏体不锈钢板材JCOE弯曲卸载回弹和应力分布特征,对预弯曲量实施相应补偿,以提高弯曲成形精度。方法基于弹塑性变形理论,利用有限元模拟研究各关键成形参数对板材弯曲卸载回弹的影响规律,将影响指标线性/非线性拟合叠加,构建回弹曲线方程。结果板料回弹量与上模下压量、下模开口量呈线性关系,与上模下行速度、摩擦因数呈指数关系。结论优化后的最佳冷弯成形工艺参数如下:上模下压量为12 mm,下模开口量为150 mm,上模下行速度为4 mm/s,摩擦因数为0.15。对于径壁比值≤10的板料成形,理论计算得到的弯曲回弹量与实测平均值吻合较好,构建的模型可以为实际生产奠定理论基础。The work aims to study the bending unloading springback and stress distribution characteristics of 316L austenitic stainless steel plate JCOE and impose corresponding compensation to pre-bending value,to improve the bending accuracy.Based on the elastic-plastic deformation theory,the effects of key forming parameters on plate bending and unloading springback were studied by finite element simulation method.The equation of springback curve was also established through linear/nonlinear fitting and superposition of affecting parameters.The springback had a linear relationship with the displacement of upper mold and the opening degree of lower mold,but had an exponential relationship with the speed of upper mold and the friction coefficient.The optimal parameters are as follow:the displacement of upper mold is 12 mm,the opening degree of lower mold is 150 mm,the speed of upper mold is 4 mm/s,and the friction coefficient is 0.15.The calculated bending springback value is in good agreement with the measured average value for the plate with diameter-wall ratio≤10.The established model can provide a theoretical foundation for the practical production.

关 键 词：焊管冷弯 回弹解析 回弹方程构建 工艺优化 

分 类 号：TG316[金属学及工艺—金属压力加工]