Transactions of Materials and Heat Treatment

Title：Research on defect mechanism and influential factors in chain-die forming for U-shaped part of advanced high strength steel

Authors： Li Yaguang Li Dayong Ding Shichao Xiao Hua Shi Lei

Unit： Shanghai Jiao Tong University Ningbo SaiRolf Metal Forming Co. Ltd. Baoshan Iron & Steel Co. Ltd. State Key Laboratory of Development and Application Technology of Automotive Steels (Bao Steel)

KeyWords： chain-die forming advanced high strength steel redundant deformation U-shaped part Chaboche model orthogonal experiment

ClassificationCode：TG331

year,vol(issue):pagenumber：2019,44(7):62-71

Abstract：

In order to explore the mechanism of common defects and the influence factors in chain-die forming for a U-shaped part with equal cross section of advanced high strength steel (AHSS), the process of chain-die forming was analyzed. It is revealed that the deformation path difference at different positions on the same cross section of sheet in the forming is the main cause of the longitudinal tension-compression redundant deformation, and the excessive redundant deformation leads to product defects such as U-shaped flange edge wave, web warpage, end flare and large springback. Then, a finite element model was established by employing the Chaboche mixed hardening model of QP1180 AHSS, and the influential factors on product defects were analyzed by the orthogonal experiment. In the analysis of the U-shaped part, the web warpage, the edge wave defect, the end flare defect and the overall degree of springback were evaluated respectively by the straightness of its longitudinal centerline, the straightness of its flange edge, the cross-sectional shape of its ends and the springback angle of its middle cross section. It provides an effective guideline for the application of this technology in the manufacture of automobile parts.

Funds：

国家自然科学基金资助项目（U1860110）

李亚光（1990-），男，博士研究生，E-mail：lyg@sjtu.edu.cn；通讯作者：李大永（1973-），男，博士，教授，E-mail：dyli@sjtu.edu.cn

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