摘要
针对铝合金薄壁零件制造过程中的回弹问题,提出了一种双曲率壁板铣削回弹的预测方法。该方法根据材料逐层去除后板料内部残余应力的重新分布情况,估算板料两个弯曲方向的回弹值。有限元模拟结果表明,铣削过程中板料的应力分布和回弹与计算结果相近;当板料铣削至中性面时,两弯曲方向的应力变化最大;随着剩余板厚的减小,计算结果与模拟结果间的误差逐渐增大。另外,单层铣削厚度与回弹规律的模拟结果表明,单层铣削厚度越大,该方法误差越大,最大误差为9.07%。为验证计算结果,进行了铝合金双曲率板料的成形-铣削实验,结果表明本文方法能够较准确预测双曲率铝合金板料铣削后的回弹。
Aiming at the springback problem during manufacturing process of aluminum alloy thin-walled parts,a springback prediction method for double-curvature stiffened panel in milling process was proposed.The method estimates the springback value in the two directions of the panel according to the redistribution of the residual stress after the material is removed layer by layer.The finite element simulation results show that the stress distribution and radius after springback of the panel during the milling process were close to the calculated results.The maximum stress variation in both directions appears when the milling depth reaches the initial neutral surface.When the remaining thickness decreases,the errors between calculation results and FEM results increase gradually.In addition,the simulation results of different single-layer milling thickness show that the larger the thickness of single-layer milling,the larger the error of this method,and the maximum error is 9.07%.The forming-milling experiments were performed to verify the proposed method.The results show that the proposed method could predict the springback of the doublecurvature stiffened panel.
作者
刘纯国
于晓彤
岳韬
李东来
张明哲
LIU Chun-guo;YU Xiao-tong;YUE Tao;LI Dong-lai;ZHANG Ming-zhe(Roll-forging Research Institute,Jilin University,Changchun 130022,China;College of Materials Science and Engineering,Jilin University,Changchun 130022,China)
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2021年第1期188-199,共12页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金项目(51575231).
关键词
双曲率壁板
回弹预测
残余应力
有限元法
double-curvature panel
springback prediction
residual stress
finite element method(FEM)
