不同弯曲方法对辊弯成形回弹的影响研究  

Study on the Influences of Bending Methods on Springback in RollForming Processes

作　　者：韩飞 孙玮隆 张若青 HAN Fei;SUN Weilong;ZHANG Ruoqing(School of Mechanical and Material Engineering,North China University of Technology,Beijing,100144)

机构地区：[1]北方工业大学机械与材料工程学院,北京100144

出　　处：《中国机械工程》2023年第19期2353-2361,共9页China Mechanical Engineering

基　　金：国家自然科学基金(51074204);北京市自然科学基金-市教委联合项目(KZ201910009011);北京市属高校高水平教师队伍建设长城学者培养计划(CIT&TCD20190306);北方工业大学毓杰团队支持计划(107051360021XN083/001)。

摘　　要：为研究辊弯成形过程中不同弯曲方法对回弹的影响,采用试验与有限元仿真相结合的方法分析了不同弯曲方法、圆角半径、板材厚度对回弹的影响;对不同弯曲方法下辊弯成形过程中的应力应变分布情况进行分析,揭示了不同弯曲方法下辊弯成形的回弹机理。研究结果表明:根据不同弯曲方法(定半径法及定长度法)的工艺原理,各道次圆角半径与弯曲段弧长的设计差异是影响两者应力-应变分布以及回弹量不同的主要因素;定半径法回弹量随道次数的增加而增大,增幅也随之增大;定长度法回弹量随道次数的增加变化不明显,且幅值大于定半径法的幅值;在两种弯曲方法下,回弹量均出现随圆角半径增大而增大、板材厚度增大而减小的趋势。In order to study the influences of different bending methods on springback in roll forming processes,the effects of different bending methods,fillet radius and sheet thickness on springback were analyzed by combining the experimental method with finite element simulation.The stress and strain distribution in the roll forming processes with different bending methods was analyzed,and the springback mechanism of roll forming was revealed.The results show that according to the design principles of different bending methods(constant radius method and constant length method),the differences between the fillet radius and the arc length of different bending sections in the design are the main factor that affect the difference of the stress-strain distribution and springback for the two methods;the springback amount of the constant bend radius method increases with the increase of the number of passes and the increment also rises;the springback of the constant arc length method does not change significantly with the increase of the number of passes,and the amplitude is greater than that of the constant bend radius method;in both bending methods,the springback increases with the increase of fillet radius and decreases with the sheet thickness increase.

关 键 词：辊弯成形 回弹 弯曲方法 定半径法 定长度法 

分 类 号：TG306[金属学及工艺—金属压力加工]