Multi-point flexible straightening process by reciprocating bending for metal profiles  

金属型材的多点柔性往复弯曲矫直工艺

作　　者：Xue-ying HUANG Jun ZHAO Gao-chao YU Qing-dang MENG Zhen-kai MU Yan-jun LIU 黄学颖;赵军;于高潮;孟庆党;穆振凯;刘彦军(燕山大学先进锻压成形技术与科学教育部重点实验室,秦皇岛066004;燕山大学机械工程学院,秦皇岛066004)

机构地区：[1]Key Laboratory of Advanced Forging&Stamping Technology and Science,Ministry of Education,Yanshan University,Qinhuangdao 066004,China [2]College of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第7期2039-2050,共12页中国有色金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.52005431);the National Natural Science Foundation of Hebei Province,China(No.E2020203086);the National Major Science and Technology Project of China(No.2018ZX04007002).

摘　　要：A multi-point flexible straightening process characterized by reciprocating bending is proposed.Specifically,the process is analyzed in terms of deformation mechanism and verified by numerical simulations and physical experiments of the straightening of a series of metal profiles with different materials and initial shapes.Further,the relationship between the bending radius and the times of reciprocating bending required to unify the curvature is discussed,and the distribution of residual stress after straightening is analyzed.The results show that the reciprocating bending process can eliminate the difference of the initial curvature,make the curvature of each section tend to be uniform;the times of reciprocating bending to reach the uniform curvature decreases with the decrease of bending radius.The straightness of the straightened profile obtained from the experiment and simulation is less than 0.2%,demonstrating a good feasibility of this method.提出一种以往复弯曲为特征的多点柔性矫直工艺。从理论上阐述该工艺的变形机理,通过数值模拟和物理实验验证不同材料、不同截面形状的一系列金属型材的矫直。进一步讨论弯曲半径与统一曲率所需往复弯曲次数的关系,并分析矫直型材后残余应力的分布情况。结果表明:往复弯曲过程可以消除初始曲率的差异,使各截面的曲率趋于均匀;型材的弯曲半径越小,达到均匀曲率所需的弯曲次数越少。实验和仿真结果表明,矫直后型材的直线度小于0.2%,验证了该方法的可行性。

关 键 词：multi-point flexibility metal profile reciprocating bending curvature unification over-bending straightening STRAIGHTNESS 

分 类 号：TG306[金属学及工艺—金属压力加工]