锻压技术

中厚板U形冲压成形有限元模拟分析及回弹预测

英文标题：Simulation analysis and springback prediction on U-shaped stamping of medium-thickness plate based on finite element simulation

作者：孙占坤李涛

单位：内蒙古工业大学内蒙古科技大学

关键词：中厚板回弹补偿 U形冲压工艺负回弹弹性应变

分类号：TG386

出版年,卷(期):页码：2022,47(5):81-88

摘要：

采用有限元模拟，针对载重汽车用大梁钢中厚板在U形冲压成形中的回弹缺陷进行研究。首先，利用Numisheet2011给出的U形冲压标准考题对所建立的有限元模型进行验证，在此基础上对汽车用中厚板进行了成形性能模拟研究，并分析了控制回弹的措施。研究结果表明：与薄板相比，中厚板的回弹行为呈现出明显差异，其冲压后上圆角上端区域出现局部增厚，而且侧壁纵截面等部位的弹性应变分布特点使得板料出现负回弹，侧壁曲线对应圆弧半径较大，同时U形件内侧侧壁出现两个应力集中点；此外，由于板料较厚，成形结构件的内外侧Mises等效应力分布表现出较大的差异。针对中厚板冲压成形可能出现的负回弹缺陷，提出采用模具回弹角补偿和增大凹凸模间隙两种方法来减小中厚板的回弹量，从而得到了较为良好的最终板形。

The springback defect during U-shaped stamping process for medium-thickness plate used as large beam steel of heavy truck was studied by finite element simulation. First, the established finite element model was verified by the U-shaped stamping standard test examples given by Numisheet2011. On this basis, a simulation study on the formability of medium-thickness plate for automobile was carried out, and the measures to control the springback were analyzed. The results show that the springback behavior of medium-thickness plate is significant different from that of thin plate, and an obvious local thickness increase emerges around the upper area of upper corner after stamping. Moreover, the elastic strain distribution characteristics on the longitudinal section of sidewall and other parts make the plate material appear negative springback, and the curve of sidewall corresponds to a larger arc radius. At the same time, two stress concentration points appear on the inner sidewall of the U-shaped part, and due to the thicker plate material, the Mises equivalent stress distributions on the inner and outer of the formed part also show significant differences. To avoid the negative springback defect in the stamping of medium-thickness plate, two methods of die springback angle compensation and increasing the clearance between punch and die are used to reduce the springback amount of medium-thickness plate, so as to obtain a better final plate shape.

基金项目：

内蒙古自然科学基金资助项目(2014MS0525)

作者简介：孙占坤(1990-)，男，博士，讲师，E-mail：sunzk_cailiao@163.com；通信作者：李涛(1975-)，女，博士，教授，E-mail：836450192@qq.com

参考文献：

[1]Gau J T, Kinzel G L. An experimental investigation of the influence of the Bauschinger effect on springback predictions[J]. Journal of Materials Processing Technology, 2001, 108(3): 369-375.

[2]Gau J T. A study of the Influence of the Bauschinger Effect on Springback in Two-dimensional Sheet Metal Forming[D]. Columbus:The Ohio State University, 2000.

[3]Chaboche J L. Constitutive equations for cyclic plasticity and cyclic viscoplasticity[J]. International Journal of Plasticity, 1989, 5(3): 247-302.

[4]Geng L M, Wagoner R H. Springback analysis with a modified hardening model[J]. SAE Transactions, 2000, 109(5): 365-375.

[5]Samuel M. Experimental and numerical prediction of springback and side wall curl in U-bendings of anisotropic sheet metals[J]. Journal of Materials Processing Technology, 2000, 105(3): 382-393.

[6]Yoshida F, Uemori T. A model of large-strain cyclic plasticity describing the Bauschinger effect and workhardening stagnation[J]. International Journal of Plasticity, 2002, 18(5-6): 661-686.

[7]Taherizadeh A, Green D E, Ghaei A, et al. A non-associated constitutive model with mixed iso-kinematic hardening for finite element simulation of sheet metal forming[J]. International Journal of Plasticity, 2010, 26(2): 288-309.

[8]唐妍, 蒋松. 翼子板内板冲压工艺数值模拟及回弹补偿 [J]. 锻压技术, 2021, 46(12): 105-111.

Tang Y, Jiang S. Numerical simulation and springback compensation on stamping process for fender inner plate[J].Forging & Stamping Technology,2021, 46(12): 105-111.

[9]李艳. 宽板 U 形弯曲的回弹试验研究[J]. 模具技术, 2014,(6):1-4.

Li Y. Experimental study on the springback for wide sheet metals after U-bending process[J]. Die and Mould Technology,2014,(6):1-4.

[10]Zein H, El Sherbiny M, Abd-Rabou M，et al. Thinning and spring back prediction of sheet metal in the deep drawing process[J]. Materials & Design, 2014, 53: 797-808.

[11]Schwarze M, Vladimirov I N, Reese S. Sheet metal forming and springback simulation by means of a new reduced integration solid-shell finite element technology[J]. Computer Methods in Applied Mechanics and Engineering, 2011, 200(5-8): 454-476.

[12]王艳艳, 高崇阳. 车辆底板冲压的响应面拟合与改进蜂群算法优化[J]. 锻压技术, 2021, 46(3): 89-95.

Wang Y Y, Gao C Y. Response surface fitting and improved bee colony algorithm optimization for vehicle bottom plate in stamping[J]. Forging & Stamping Technology,2021, 46(3): 89-95.

[13]GB/T 228.1—2021,金属材料拉伸试验第1部分:室温试验方法[S].

GB/T 228.1—2021,Metallic materials—Tensile testing—Part 1: Method of test at room temperature[S].

[14]王秀凤, 张永春. 冷冲压模具设计与制造[M]. 3版. 北京：北京航空航天大学出版社, 2008.

Wang X F, Zhang Y C. Design and Manufacture of Cold Stamping Die[M]. 3rd Edition. Beijing：Beihang University Press, 2008.

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