窄板拉弯成形的数值分析与回弹计算

杜颂; Anatoly; Chumadin

窄板拉弯成形的数值分析与回弹计算

1.
北京航空航天大学机械工程及自动化学院, 北京 100083
2. 俄罗斯国立技术大学飞行器制造系, 莫斯科 109240

详细信息

中图分类号: TG 386
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出版历程
- 收稿日期: 2003-09-24
- 网络出版日期: 2004-09-30

Numerical calculation of stretch bending of narrow strip and analysis on spring back

1.
School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
2. Department of Aircraft Production, Moscow State Aviation Technology University, Moscow 109240, Russia

摘要

摘要: 在考虑加载历史的情况下,为采用数值方法研究窄板拉弯成形,将变形区划分成若干个单元,按塑性变形体积不变条件,确定单元应变.利用增量理论,由差分方程算出应力分布,并分析了加载历史对其影响.依据卸载变形的分析计算,推导出回弹后中性层弯曲半径及弯曲角变化量的计算公式.计算结果表明,先弯曲再拉伸时应力分布规律更利于减小回弹.
- 弯曲 /
- 数值计算 /
- 残余应力 /
- 回弹
Abstract: To analyse stretch bending of narrow strip by numerical calculation, taking the loading history into account, the deformed zone was divided intomany elements to determine their strain by the condition that constant volume remains in deformation. Increment strain theory was applied to calculating the stress distribution from difference equation and the effect of loading history on them was discussed. The formulae for calculating the bend radius of neutral plane and the decrement of bend angle after springback were derived by considering the deformation after unloading. The simulative results show that stress distribution under stretching with superimposed bending is more advantageous to the reduction of spring back.
- bending /
- numerical calculation /
- residual stress /
- spring back

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参考文献(1)

[1] Ершов В.И,Чумадин А.С. Листовая штамповка расчёт технологических параметров справочник[M]. Масква:МАИ,1999 [2]Woo D M. Analysis of the cup-drawing process[J]. Journal of Mechanical Engineering Science, 1964,6(2):116~131 [3]Hardt D E, Valentin W A. In process control of strain in a stretch forming process .In:Proceedings of the ASME Manufacturing in Engineering Division , 2000.793~803 [4] 胡世光,陈鹤峥.板料冷压成形原理.修订版[M].北京:国防工业出版社,1989 Hu Shiguang, Chen Hezheng. Principle of sheet metal stamping. Revision edition[M]. Beijing:National Defence Industry Press,1989 (in Chinese)

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