Transactions of Materials and Heat Treatment

Title：Research on forming and springback of closed anti-collision beam for high-strength steel with complex cross-section

Authors： Cao Daxing Gao Yanan Wang Jibin WuYuhui Liu Yang

Unit： Lingyun Industrial Co. Ltd.

KeyWords： complex cross-section high-strength steel anti-collision beam springback wrinkle

ClassificationCode：TG386

year,vol(issue):pagenumber：2019,44(6):154-161

Abstract：

For the problem that the springback of part with complex cross-section structure is difficult to control in the forming process, the forming and springback characteristics of closed anti-collision beam with complex cross-section for high-strength steel DP980 were studied by numerical simulation and experiment. The relationship among springback angle, over-bending angle and design angle error was obtained by comparing the design angle, forming angle and workpiece angle after springback. By analyzing the distribution of stress and strain after forming, the crack risk and wrinkle areas were obtained. By comparing the distribution of stress and strain before and after springback, the main location of springback and the variation of stress release were obtained. Furthermore, the accuracy of the simulation was verified by comparing the forming angle of experimental anti-collision beam,the size and center distance of fold pit with the result of simulation. The results show that the springback of closed anti-collision beam with complex cross-section for high strength steel is serious, and the springback angle is 2.2°, which is 17% of the forming angle. After springback, the stress is released at the edge, and the residual stress mainly concentrates in the arc area. After springback, there are wrinkles on the inner arc surface with the depth of 2 mm, the distance between the centers of wrinkles is 48 mm, and there is no risk of tension cracks on the outer arc surface. Thus, it is difficult to control the springback of the workpiece with the actual forming angle of 10.1° measured by CMM, which is 2.3° different from the design angle 7.8°.

Funds：

曹大兴(1990-)，男，硕士，工程师 E-mail：caodaxing@lygf.com 通讯作者：高亚南(1984-)，男，博士，高级工程师

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