Transactions of Materials and Heat Treatment

Title：Influence of drawbeads on forming limit for sheet metal

Authors： Li Qiaomin1 Li Xu1 Liu Yuqi2 Jiang Wei1 Chen Wei1 Li Hongjun1

Unit：

KeyWords：

ClassificationCode：TG386.1

year,vol(issue):pagenumber：2021,46(9):184-189

Abstract：

In order to increase the prediction accuracy of fracture defects during the numerical simulation of drawing, the influence of drawbead on the formability of sheet metal in the drawing process was studied. Three kinds of convex drawbead inserts with different heights and three kinds of concave drawbead inserts with different shoulder fillet radius were designed and manufactured. Then, the convex drawbead inserts and the concave drawbead inserts were combined to form drawbeads with different sectional dimensions, and the influence laws of pre-strain induced by passing through drawbeads and drawbead sectional geometry parameters on the sheet forming limit were analyzed by drawing the sheet metal through the drawbeads. The results show that after the sheet metal flows through the drawbead, the forming limit of sheet is improved, and the forming limit curve of sheet metal moves upwards in the strain space. Furthermore, under the effect of any set of drawbead inserts, the offset of the forming limit curve is approximately linearly related to the pre-strain induced by passing through drawbeads, and when the drawbead inserts with different dimensions produce the same pre-strain, the offset of the forming limit curve increases with the increasing of the drawbead height and decreases with the increasing of the shoulder filler radius.

Funds：

国家自然科学基金资助项目（51805181）

李巧敏（1989-），女，博士，副教授 E-mail：qmli@wtu.edu.cn 通信作者：李红军（1974-），男，硕士，教授 E-mail：lihongjun@wtu.edu.cn

Reference：

[1]Zhang Q, Liu Y, Zhang Z. A new optimization method for drawbead in sheet forming process based on plastic forming principles[J]. The International Journal of Advanced Manufacturing Technology, 2017, 92(9-12): 3143-3153.

[2]Halkaci H S, Turkoz M, Dilmec M. Enhancing formability in hydromechanical deep drawing process adding a shallow drawbead to the blank holder[J]. Journal of Materials Processing Technology, 2014, 214(8): 1638-1646.

[3]Su C, Zhang K, Lou S, et al. Effects of variable blank holder forces and a controllable drawbead on the springback of shallowdrawn TA2M titanium alloy boxes[J]. The International Journal of Advanced Manufacturing Technology, 2017, 93(5-8): 1627-1635.

[4]Zhang Q, Liu Y, Zhang Z. A theoretical optimization method for drawbead restraining forces in automotive panel forming based on plastic flow principles[J]. Structural and Multidisciplinary Optimization, 2018, 57(1): 267-278.

[5]Bohn M L, Xu S G, Weinmann K J, et al. Improving formability in sheet metal stamping with active drawbead technology[J]. Journal of Engineering Materials and Technology, 2001, 123(4): 504.

[6]卿启湘，陈哲吾，刘杰，等. 基于Kriging插值和回归响应面法的冲压成形参数的优化及对比分析[J]. 中国机械工程, 2013，24(11): 1447-1452.

Qing Q X, Chen Z W, Liu J, et al. Study on comparison and optimization of sheet forming parameters using Kriging interpolation and regression response surface metamodeling techniques[J]. China Mechanical Engineering, 2013，24(11): 1447-1452.

[7]田恕，张杰刚，李倩，等. 拉延筋结构对椭球瓜瓣构件充液拉深过程的影响 [J].锻压技术，2019,44(3):77-82.

Tian S，Zhang J G，Li Q，et al. Influence of drawbead structure on ellipsoidal scalloped segment component in hydraulic drawing process [J]. Forging & Stamping Technology, 2019，44(3):77-82.

[8]李巧敏，柳玉起，张秋翀. 基于金属塑性成形理论的汽车覆盖件成形工艺智能优化方法[J]. 塑性工程学报, 2018，25(5): 60-65.

Li Q M, Liu Y Q, Zhang Q C. An intelligent optimization method for automobile panel forming based on metal plastic forming theory[J]. Journal of Plasticity Engineering, 2018，25 (5): 60-65.

[9]Emmens W C. Formability: A Review of Parameters and Processes that Control, Limit or Enhance the Formability of Sheet Metal[M]. Springer Science & Business Media, 2011.

[10]Schmid H, Hetz P, Merklein M. Failure behavior of different sheet metals after passing a drawbead[J]. Procedia Manufacturing, 2019, 34: 125-132.

[11]李群，张青，刘鹏，等. 经过拉深筋预变形板材的后续冲压性能[J]. 塑性工程学报, 2015，22(2): 74-77.

Li Q, Zhang Q, Liu P, et al. Subsequent stamping formability analysis on plate after predeformation of drawbead[J]. Journal of Plasticity Engineering, 2015，22(2): 74-77.

[12]李巧敏，柯俊逸，柳玉起，等. 拉深筋对板材变形特征和力学性能的影响研究[J]. 中国机械工程, 2020, 31(15): 1885-1889.

Li Q M, Ke J Y, Liu Y Q, et al. Study on the effects of drawbead on deformation characteristics and mechanical properties of sheet metal[J]. China Mechanical Engineering, 2020, 31(15): 1885-1889.

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