摘要
为了解决先进高强度钢弯曲管状零件存在的严重回弹缺陷问题,提出了一种利用充压镦形工艺来控制此类零件回弹的新方法。该工艺的力学原理是通过上模的合模运动(垂直于弯曲轴线),对弯管施加环向压缩使环向材料发生塑性变形和后继屈服,使内、外侧的轴向弯曲应力完全转化为轴向压应力,消除了由弯曲引起的内层压应力和外层拉应力之间的轴向应力差,实现了基本控制回弹的目的,这与拉弯法的力学原理正好相反。采用有限元分析和实验验证两种方法来揭示充压镦形控制管状件弯曲回弹的力学机理。研究结果表明,管材的弯曲回弹量随着压缩量的增加而减小,并且存在一定的临界压缩量。对于抗拉强度分别为600和800 MPa的先进高强钢,通过该方法可将回弹量降低95%以上。
In order to overcome the problem of advance high-strength steel(AHSS)bending tube component with serious springback defect,a new method to control the springback of such parts by hydro-forging process was proposed.Its mechanical principle was to apply a certain amount of compression along the circumferential direction for the bending tube through the clamping motion of upper die(perpendicular to the bending axis)to lead the plastic deformation and subsequent yield of circumferential material,so that the inner and outer axial bending stresses were all transformed into the axial compressive stress,that leaded to eliminate the axial stress difference between the compressive stress on inner layers and the tensile stress on outer layers which caused by bending,so reaching the purpose of basically eliminating springback.This is contrary to the mechanical principle of the stretch bending method.Finite element analysis and experimental verification were adopted to reveal the mechanical mechanism of controlling tube component bending springback by hydro-forging.The research results show that,the bending springback amount decreases with the increasing of the compression amount of tube,and there is a certain critical compression amount.For AHSS with the tensile strengths of 600 and 800 MPa respectively,the springback amount could be reduced by more than 95%by this method.
作者
林才渊
简翰鸣
寇晗涛
宋柯
冯苏乐
赵耀邦
孙磊
初冠南
Lin Caiyuan;Jian Hanming;Kou Hantao;Song Ke;Feng Sule;Zhao Yaobang;Sun Lei;Chu Guannan(Shanghai Aerospace Research Institute of Precision Machinery,Shanghai 201600,China;School of Materials Science and Engineering,Harbin Institute of Technology(Weihai),Weihai 264209,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2023年第5期117-122,161,共7页
Forging & Stamping Technology
基金
国家自然科学基金资助项目(U1937205)
山东省重大科技创新工程(2020CXGC010303)。
关键词
充压镦形
先进高强钢
弯曲管状件
回弹控制
临界压缩量
hydro-forging
advance high-strength steels
bending tube component
springback control
critical compression amount
