锻压技术

双重拉深筋阻力特性研究

英文标题：Investigation on character of double drawbead restraining force

作者：杨帅董湘怀

单位：（上海交通大学国家模具CAD工程研究中心上海 200030）

分类号：TG386.3+2

出版年,卷(期):页码：2018,43(5):0-0

摘要：

基于平面变形假设，利用虚功原理建立了一种双重拉深筋阻力模型。在板料流经拉深筋时，考虑弯曲效应所导致的厚度变化和反复弯曲所导致的循环硬化对拉深筋阻力的影响，将板料减薄、混合硬化引入到弯曲力的模型计算中。通过DC04钢板拉深筋阻力测试实验，验证了所建理论模型的准确性，并根据实验结果分析了拉深筋几何参数对双重拉深筋阻力的影响。实验结果表明：筋高对双筋阻力的影响较大，二者近似为指数关系；双筋阻力随圆角半径增大而逐渐减小，且逐渐趋于平缓，二者近似为幂函数关系。板料厚度变化和循环硬化影响的双重拉深筋阻力模型贴近实验值，能描述板料经过双重拉深筋时的力学行为。

Based on the principle of virtual work and plane deformation assumption, a model of double drawbead restraining force (DBRF) was proposed, when the sheet metal flowed through drawbead, taking account of the influence of thickness change caused by bending effect and cyclic hardening caused by continuous bending on drawbead restraining force, the sheet thinning and combined hardening model were introduced into model calculation of bending force. Through the double drawbead restraining force test for DC04, the accuracy of established theory model was verified, and the influence of drawbead geometric parameters on DBRF was analyzed based on the experiment results. The results show that the drawbead height influences the DBRF evidently, and the DBRF increases exponentially as the drawbead height increases. And the DBRF decreases gradually in a power function as the fillet radius increases. And the DBRF model which is affected by the change of sheet thickness and cyclic hardening agrees better with the experiment data and can describe the mechanial behavior when the sheet metal flows through double drawbead.

基金项目：

作者简介：杨帅(1994-)，男，硕士研究生 Email：yanglshuai@sjtu.edu.cn 通讯作者：董湘怀(1955-)，男，博士，教授 Email：dongxh@sjtu.edu.cn

参考文献：

［1］金淼. 板料成形中拉深筋的力学性能及影响因素研究
［D］.秦皇岛:燕山大学,2000.

Jin M. Drawbead Mechanics Characters and Influences in Sheet Forming
［D］. Qin Huangdao: Yanshan University, 2000.

［2］Weidemann C. The blankholding action of drawbeads
［J］. Sheet Metal Industries, 1978, (9): 984-989.

［3］Shu H L, Zhong Q L, We L X, et al. An improved equivalent drawbeads model and its application
［J］. Journal of Materials Processing Technology, 2002, 121(2): 308-312.

［4］Wang N M, Shah V C. Drawbead design and performance
［J］. Journal of Materials Shaping Technology, 1991, 9(1): 21-26.

［5］Stoughton T B. Model of drawbead forces in sheet metal forming
［A］. Proceedings of the 15th Biennial IDDRG Congress
［C］. Toronto: The International Deep Draining Research Group, 1988.

［6］余彦永，罗仁平，罗家兵，等. 板料流经拉深筋厚度减薄的研究
［J］. 塑性工程学报,2016,24(5):47-51.

Yu Y Y, Luo R P, Luo J B，et al. A study on thinning of sheet metal flowing through the drawbead
［J］. Journal of Plasticity Engineering, 2016, 24(5):47-51.

［7］韩超，董湘怀. 一种考虑包辛格效应的等效拉深筋模型
［J］. 锻压技术, 2017,42(4):33-39.

Han C，Dong X H. An equivalent drawbead model considering Bauschinger effect
［J］. Forging & Stamping Technology,2017,42(4):33-39.

［8］Firat M. An analysis of sheet drawing characteristics with drawbead elements
［J］. Computational Materials Science, 2008, 41(3):266-274.

［9］Chen F, Liu J. Analysis of an equivalent drawbead model for the finite element simulation of a stamping process
［J］. International Journal of Machine Tools & Manufacture, 1997,37 (4):409-423.

［10］胡世光，陈鹤峥. 板料冷压成形的工程解析
［M］. 北京：北京航空航天大学出版社，2004.

Hu S G, Cheng H Z. Engineering Analysis of Sheet Metal Forming
［M］. Beijing:Beijing University of Aeronautics and Astronautics Press, 2004.

［11］Hill R. The Mathematical Theory of Plasticity
［M］. Oxford:Oxford University Press, 1998.

［12］Voce E. The relationship between stress and strain for homogeneous deformation
［J］. Journal of the Institute of Metals, 1948, 74: 537-562.

［13］Armstrong P J, Frederick C O. A Mathematical Representation of the Multiaxial Bauschinger Effect
［J］. High Temperature Technology,1998,24(1):1-26.

服务与反馈：

【本网站尚未开通全文下载服务】【加入收藏】