Transactions of Materials and Heat Treatment

Title：Preliminary study on swing area in the end of V-shaped bending part

Authors： Zhang Ruhua Huang Zhisong Yin Yan Xu Qiang

Unit： Nanchang University

KeyWords： sheet metal forming V-shaped bending end swing end point trajectory ratio of die mouth and material length die corner radius punch corner radius

ClassificationCode：TG386.3+1

year,vol(issue):pagenumber：2016,41(10):64-70

Abstract：

In order to avoid the end of workpiece intervening with die or press, the endpoint trajectory parameter equation with camber angel α of V-shaped bending part ignoring the corner radius of die was listed based on analysis of deformation process and some essential assumptions. It is proved that the ratio of die mouth and material length (l/L) determines the value of αm, and the bigger the l/L is, the smaller the αm is, vice versa. When die half-angel β≤(π/2)-αm , the extremum can exist in endpoint trajectory curve. β and l/L also determine the swing area of workpiece out of die, and the bigger the l/L is, the smaller the area is, vice versa. Combining equation and mapping, the change of swing area was discussed in l/L=(0.50-0.30) under three conditions as increasing die corner radius, increasing punch corner radius, or additive effect of die and punch corner radius.The approximate trajectory equation of neutral plane endpoints was given.So the size of swing area in the end of V-shaped bending part should be determined according to the degree of space shortage.

Funds：

作者简介：张如华（1958-），男，硕士，教授 E-mail：zhangruhua@ncu.edu.cn

Reference：

[1]聂静静. 数控板料弯曲成形设备研究及有限元分析[D]. 长春：吉林大学，2015.

Nie J J. Research and Finite Element Analysis on CNC Bending Forming Equipment of Sheet Metal[D]. Changchun: Jilin University, 2015.

[2]张如华. 冲压工艺与模具设计[M]. 北京：清华大学出版社，2006.

Zhang R H. Stamping Process and Die Design[M]. Beijing: Tsinghua University Press, 2006.

[3]黄伟，李梦群，杨亚威. 基于Dynaform的V形件弯曲回弹数值模拟[J]. 锻压技术，2014，39（6）：118-121.

Huang W, Li M Q, Yang Y W. Numerical analysis of springback for V-shaped pieces based on Dynaform[J]. Forging & Stamping Technology, 2014, 39(6): 118-121.

[4]李建，赵军，展培培，等. 板料自由弯曲成形及回弹理论解析[J]. 塑性工程学报，2008，16（4）：1-6.

Li J, Zhao J, Zhan P P, et al. Theoretic analysis of forming and springback for sheet metal air bending[J]. Journal of Plastic Engineering, 2008, 16(4): 1-6.

[5]赵军，段璟，马瑞，等. 小曲率平面弯曲弹复方程[J]. 中国科学：技术科学，2011，41（10）：1342-1352.

Zhao J, Duan J, Ma R, et al. Springback equation of small curvature plane bending[J]. Sci. China: Tech. Sci., 2011, 41(10): 1342-1352.

[6]Chan K C, Wang S H. Theoretical analysis of spring back in bending of integrated circuit lead frames[J]. Journal of Materials Processing Technology,1999, 91(1-3): 111-115.

[7]胡丽华，樊新乾. 板料弯曲成形性能有限元模拟研究[J]. 模具工业，2013，39（1）：25-28.

Hu L H, Fan X Q. Finite element simulation study of bending forming performance of sheet metal[J]. Mould Industry, 2013, 39(1): 25-28.

[8]张逸. 金属板料自由折弯模型与实验研究[D]. 武汉：华中科技大学，2012.

Zhang Y. A Thesis Submitted in Partial Fulfillment of the Requirments for the Degree of Master of Engineering[D]. Wuhan: Huazhong University of Science and Technology, 2012.

[9]De Vin, Leo J. Expecting the unexpected, a must for accurate brake forming[J]. Journal of Material Processing Technology, 2001, 117: 244-248.

[10]康海军，余金凤. 板料90°角弯曲展开经验公式[J]. 锻压装备与制造技术，2013，48（4）：65-66.

Kang H J, Yu J F. Empirical formula of 90°angel sheet metal bending[J]. Forging Equipment and Manufacturing Techniques, 2013, 48(4): 65-66.

[11]王孝培. 冲压设计资料[M]. 北京：机械工业出版社，1983.

Wang X P. Stamping Design Data[M]. Beijing: China Machine Press, 1983.

[12]喻平. 数学问题化归理论与方法[D]. 南京：南京师范大学，2002.

Yu P. The Theory and Method of Mathematical Transformation[D]. Nanjing: Nanjing Normal University, 2012.

[13]曾铮，杨之. “化归”刍论[J]. 数学教育学报，2001，10（4）：38-41.

Zeng Z, Yang Z. The hay theory of “Transformation”[J]. Journal of Mathematics Education, 2001, 10(4): 38-41.

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