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Received: 2006-02-20

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Journal of Zhejiang University SCIENCE A 2007 Vol.8 No.2 P.237-244

http://doi.org/10.1631/jzus.2007.A0237


An analytical model for predicting sheet springback after V-bending


Author(s):  ZHANG Dong-juan, CUI Zhen-shan, CHEN Zhi-ying, RUAN Xue-yu

Affiliation(s):  National Mold & Die CAD Engineering Research Center, Shanghai Jiao Tong University, Shanghai 200030, China

Corresponding email(s):   zhdongjuan@126.com

Key Words:  Springback, V-bending, Contact pressure, Neutral surface shifting, Transverse stress, Bending ratio


ZHANG Dong-juan, CUI Zhen-shan, CHEN Zhi-ying, RUAN Xue-yu. An analytical model for predicting sheet springback after V-bending[J]. Journal of Zhejiang University Science A, 2007, 8(2): 237-244.

@article{title="An analytical model for predicting sheet springback after V-bending",
author="ZHANG Dong-juan, CUI Zhen-shan, CHEN Zhi-ying, RUAN Xue-yu",
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year="2007",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.2007.A0237"
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%T An analytical model for predicting sheet springback after V-bending
%A ZHANG Dong-juan
%A CUI Zhen-shan
%A CHEN Zhi-ying
%A RUAN Xue-yu
%J Journal of Zhejiang University SCIENCE A
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%D 2007
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2007.A0237

TY - JOUR
T1 - An analytical model for predicting sheet springback after V-bending
A1 - ZHANG Dong-juan
A1 - CUI Zhen-shan
A1 - CHEN Zhi-ying
A1 - RUAN Xue-yu
J0 - Journal of Zhejiang University Science A
VL - 8
IS - 2
SP - 237
EP - 244
%@ 1673-565X
Y1 - 2007
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2007.A0237


Abstract: 
springback is caused by the redistribution of stress in sheet material after the tooling is removed. Precise prediction of sheet springback is very important in die design. Based on Hill’s yielding criterion and plane strain condition, an analytical model is proposed in this paper which takes into account the effects of contact pressure, the length of bending arm between the punch and die, transverse stress, neutral surface shifting and sheet thickness thinning on the sheet springback of v-bending. The predicted results by this analytical model indicated that the contact pressure and transverse stress have much effect on the springback when the bending ratio (the ratio of punch radius to sheet thickness) is less than five. The contact pressure declined when the length of bending arm goes up, which means that shorter length of bending arm will result in larger springback. The effect of neutral surface shifting on the springback is less than that of contact pressure and decreases with the bending ratio. However, this research showed that the influence of thickness thinning on the springback can be ignored. Comparison with finite element method (FEM) simulating results shows that the predicted results by the analytical model accord well with simulation results by FEM. In addition to that, the bending ability—the limit bending ratio for a given sheet thickness and material properties was also determined.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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