Transactions of Materials and Heat Treatment

Title：Experimental study on springback of high strength steel sheet based on stamping processes under different U-shaped bending

Authors： Nie Xin Yang Xinyu Niu Xinghui He Shouxin

Unit： Hunan University HBIS Company Limited AISN Innovation Design and Manufacture Company Limited

KeyWords： high strength steel hat-shaped parts U-shaped bending springback blank holder force

ClassificationCode：TG386.4

year,vol(issue):pagenumber：2019,44(12):1-10

Abstract：

For hat-shaped parts, a lot of experimental study and analysis were conducted by a self-designed and manufactured die for springback experiments, and the springback laws of three different properties of high strength steel sheet such as HC420LA, HC420/780DP and QP980 in stamping processes under different U-shaped bending and in different forming conditions were compared to provide theoretical guidance for actual production and design. The results show that under any stamping process, the springback of HC420LA steel is much smaller than that of HC420/780DP steel and QP980 steel, and the sidewall springback of hat-shaped parts is minimal under the free bending. However, the springback on flange edge is the smallest under the bending with intermediate force, and the springback under the bending with the blank holder force is always the largest. With the increasing of material thickness, the springback of three high-strength steel sheets decreases continuously, however, when the QP980 steel with the thickness of 1.4 mm is subjected to bend with intermediate force, the springback tends to increase in the opposite direction. Furthermore, the springback of three high-strength steel sheets increases with the increasing of the gap between punch and die, the blank holder force with 180-280 kN has little effect on the springback of HC420/780DP steel and QP980 steel, and the springback on flange edge increases with the increasing of bending angle.

Funds：

国家自然基金重点项目（61232014）；广西区科技计划资助项目（1348005-1，14122005-7）；柳州柳东新区科学研究与技术开发计划项目（20170204）；汽车用钢开发与应用技术国家重点实验室2017年度开放课题（201891930854）

聂昕（1982-），男，博士，助理研究员 E-mail：niexinpiero@163.com

Reference：

［1］瘙塁en N,Karaaa ,Kurgan N. Experimental research on warm deep drawing of HC420LA grade sheet material
［J］. The International Journal of Advanced Manufacturing Technology,2016,87(9-12): 3359-3371.

［2］孔政,张杰,李洪波,等.摩擦系数对DP780钢拉深成形极限的影响
［J］.塑性工程学报,2018,25(2)：252-259.

Kong Z,Zhang J,Li H B,et al. Effects of friction coefficient on the deep-drawing forming limit of dual-phase steel
［J］.Journal of Plasticity Engineering,2018,25(2):252-259.

［3］王亚东,刘宏亮,王亚芬,等.Q&P钢的研究现状及前景展望
［J］.金属世界,2018，(3)：18-21.

Wang Y D,Liu H L,Wang Y F,et al. Research status and prospects of Q&P steel
［J］.Metal World,2018，(3):18-21.

［4］连昌伟,陈新平,叶又.基于零件应用的第3代高强钢——QP钢的成形特性
［J］.精密成形工程,2017,9(4)：79-84.

Lian C W,Chen X P,Ye Y. Formability of the 3rd generation high strength steel-QP steel based on part application
［J］.Journal of Netshape Forming Engineering,2017,9(4):79-84.

［5］杨安民.压边力对板料U形弯曲回弹的影响
［J］.模具工业,2007，(8)：44-48.

Yang A M.Effect of blankholder pressure on the springback in U shaped bending of sheet material
［J］.Die & Mould Industry,2007，(8):44-48.

［6］李彦波,刘荣丰,刘红武.基于JSTAMP/NV的U形冲压件弯曲回弹分析
［J］.计算机辅助工程,2012,21(1)：77-80.

Li Y B,Liu R F,Liu H W.Bending springback analysis of U-shape stamping part based on JSTAMP/NV
［J］.Computer Aided Engineering,2012,21(1)：77-80.

［7］王兴.基于数值模拟与试验的弯曲回弹及模具型面补偿研究
［D］.济南：山东大学,2013.

Wang X.The Numerical Simulation and Experimental Research on Bending Springback and Die Surface Compensation
［D］.Jinan：Shandong University,2013.

［8］彭伟.高强度板U形件的回弹控制方法研究
［D］.南昌：南昌大学,2008.

Peng W.Research on the Springback Control Methods in High Strength Sheet U-shaped Parts Stamping Forming
［D］.Nancahng：Nanchang University,2008.

［9］李艳.宽板U形弯曲的回弹试验研究
［J］.模具技术,2014，(6):1-4，18.

Li Y. Experimental study on the springback for wide sheet metals after U-bending process
［J］.Die and Mould Technology,2014，(6):1-4，18.

［10］李茂延,刘颖.回弹机理的研究与控制综述
［J］.机械工程与自动化,2017,(4):224-226.

Li M Y,Liu Y.Review on research and control of springback mechanism
［J］. Mechanical Engineering & Automation,2017，(4):224-226.

［11］刘俊雄,徐栋恺,郑韬.QP980超高强钢V型弯曲回弹特性研究
［J］.模具工业,2017,43(8)：5-9.

Liu J X,Xu D K,Zheng T.Research on springvack behaviors of V-shape bending for QP980 ultra-high strength steel
［J］.Die & Mould Industry,2017,43(8):5-9.

［12］郑德兵,柳一凡,吴纯明,等.汽车用第三代高强度钢QP980冲压成形性研究
［J］.中国机械工程,2014,25(20)：2810-2813.

Zhen D B,Liu Y F,Wu C M,et al. Study on stamping formability of third generation HSS QP980 for vehicle car body applications
［J］.China Mechanical Engineering,2014,25(20):2810-2813.

Service：

【This site has not yet opened Download Service】【Add Favorite】