锻压技术

DP980高强钢U形弯曲实验与数值模拟

英文标题：Test and numerical simulation of U-shape bending part for DP980 high strength steel

作者：张华平李亚连昌伟

单位：宝山钢铁股份有限公司

分类号：TG386

出版年,卷(期):页码：2020,45(4):70-75

摘要：

为了评估DP980高强钢材料的成形与回弹特性，通过加载-卸载实验与单向拉伸-压缩循环加载实验，获得了考虑包申格效应的吉田-上森硬化模型参数，并对DP980高强钢的U形弯曲实验进行了研究。实验结果表明，DP980高强钢U形件在凹模圆角处易开裂，在成形过程中需减小压边力并增大凹模圆角。由于材料的回弹量与施加的压边力有关，可通过增大压边力来减小U形件的回弹，但压边力过大又可能导致开裂，因此，需合理选择压边力。同时，对U形件成形后的回弹进行仿真分析，仿真中分别采用等向硬化模型与吉田-上森硬化模型，通过将实验数据与模拟的回弹结果进行对比分析发现，采用吉田-上森硬化模型的仿真结果与实验结果吻合良好，证明了吉田-上森硬化模型模拟回弹的准确度较高，可以应用于回弹仿真中。

In order to evaluate the forming and springback characteristics of DP980 high strength steel, the parameters of Yoshida-Uemori hardening model which considers Bauschinger effect were obtained through loading-unloading test and uniaxial tension-compression cycle loading test, and the U-shaped bending test of DP980 high strength steel was studied. The results show that the U-shaped part of DP980 high strength steel is easy to crack near the fillet of die, and it is necessary to reduce the blank holder force and increase the fillet of die in the forming process. The springback amount of material is related to the blank holder force, and it can be reduced by increasing the blank holder force. However, excessive blank holder force may lead to crack. Therefore, it is important to choose a reasonable blank holder force. At the same time, the springback of U-shape part after forming was simulated by using the isotropic hardening model and Yoshida-Uemori hardening model. By comparing the experimental data with the springback result of simulation, it is found that the simulation results of Yoshida-Uemori hardening model are in good agreement with the experimental results, which verifies the high accuracy of Yoshida-Uemori hardening model to simulate the springback. So it can be applied in springback simulation.

基金项目：

国家重点研发计划项目（2017YFB0304403）

张华平（1985-），男，本科，助理工程师 E-mail：zhanghuaping@baosteel.com 通讯作者：李亚（1989-），女，硕士，中级工程师 E-mail：liya@baosteel.com

参考文献：

[1]世界钢铁协会，世界汽车用钢联盟. 先进高强度钢应用指南[M]. 宝山钢铁股份有限公司，译. 北京：冶金工业出版社，2018.

Worldsteel，World Autosteel. Advanced High-strength Steels Application Guidelines Version[M]. Translated by Baoshan Iron and Steel Co., Ltd. Beijing: Metallurgical Industry Press, 2018.

[2]蒋浩民，陈庆欣，陈新平，等. 双相钢板应变强化和烘烤硬化特性实验研究[J]. 塑性工程学报，2009，16(1): 173-175.

Jiang H M, Chen Q X, Chen X P, et al. Experimental study on the strain hardening and bake hardening properties of dual phase steel[J]. Journal of Plasticity Engineering, 2009, 16(1): 173-175.

[3]Q/BQB 418—2018,宝钢股份企业标准第四分册：冷轧产品[S].

Q/BQB 418—2018, Baoshan Iron and Steel Co., Ltd. standard—Part 4: Cold rolled steel[S].

[4]李富柱，翟长盼，李伟，等. 汽车车身构件冲压回弹研究现状[J]. 锻压技术，2018,43(2)：1-8.

Li F Z,Zhai C P,Li W,et al.Research on status of stamping springback for auto-body parts[J].Forming & Stamping Technology,2018,43(2)：1-8.

[5]姜天亮，龚红英，钱勇，等. 基于响应面法的U形件弯曲成形回弹优化 [J]. 锻压技术，2020,45(1):63-68.

Jiang T L,Gong H Y,Qian Y,et al.Optimization on bending springback of U-shaped parts based on response surface method[J].Forming & Stamping Technology，2020,45(1):63-68.

[6]JIS Z 2241：2011, Metallic material—Tensile testing—Method of test at room temperature[S].

[7]GB/T 228.1—2010,金属材料拉伸试验第1部分：室温试验方法[S].

GB/T 228.1—2010,Metallic material—Tensile testing—Part 1:Method of test at room temperature[S].

[8]刁可山，蒋浩民，谢坚强. 1000 MPa级DP钢的成形特性实验[J]. 塑性工程学报，2012，19(4): 95-98.

Diao K S, Jiang H M, Xie J Q. Experimental research on mechanical properties and formability of 1000 MPa DP steel[J]. Journal of Plasticity Engineering, 2012, 19(4): 95-98.

[9]蒋浩民，陈新平，石磊，等. 先进高强度钢板的冲压成形特性及其应用[J].塑性工程学报，2009，16(4)：183-186.

Jiang H M, Chen X P, Shi L, et al. Forming characteristics and application of advanced high strength steel[J]. Journal of Plasticity Engineering, 2009，16(4):183-186.

[10]Fusahito Yoshida, Takashi Uemori. A model of large-strain cyclic plasticity describing the bauschinger effect and work hardening stagnation[J].International Journal of Plasticity, 2002,18:661-686.

[11]Fusahito Yoshida, Takashi Uemori, Kenji Fujiwara. Elastic-plastic behavior of steel sheets under in-plane cyclic tension-commpression at large strain[J].International Journal of Plasticity,2002,18(5-6):63-65.

[12]Fusahito Yoshida, Takashi Uemori. A model of large-strain cyclic plasticity and its application to spring-back simulation[J].International Journal of Mechanical Sciences, 2003,45(10):1687-1702.

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