| An analytical model for predicting sheet springback after V-bending |
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| 作者姓名： | ZHANG Dong-juan CUI Zhen-shan CHEN Zhi-ying RUAN Xue-yu |
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| 作者单位： | National Mold ＆ Die CAD Engineering Research Center, Shanghai Jiao Tong University, Shanghai 200030, China |
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| 摘 要： | INTRODUCTION As an important manufacturing method, bending has been widely used in modern industries to produce stamping parts such as frames, channels, braces, brackets and other structural parts. The understanding and development of bending mechanics are aimed at achieving two kinds of information which are very important for industrial production. One is to predict springback for dies design and compensation in order to obtain high dimension accuracy of bending parts. The other is to …
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| 关 键 词： | 回弹 弯曲 有限元分析 冷冲压工艺 |
| 收稿时间： | 2006-02-20 |
| 修稿时间： | 2006-10-13 |
An analytical model for predicting sheet springback after V-bending |
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| 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,2007,8(2):237-244. |
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| Authors: | Dong-juan Zhang Zhen-shan Cui Zhi-ying Chen Xue-yu Ruan |
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| Institution: | (1) National Mold & Die CAD Engineering Research Center, Shanghai Jiao Tong University, Shanghai, 200030, China |
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| 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.
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| Keywords: | Springback V-bending Contact pressure Neutral surface shifting Transverse stress Bending ratio |
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