Transactions of Materials and Heat Treatment

Title：Research on edge cracking in flanging for threshold partition of steel QP980

Authors： Yuan Zhipeng Diao Faxi Chen Xinping

Unit： Research Institute of Baosteel State Key Laboratory of Development and Application Technology of Automotive Steels（BaoSteel） SAIC Motor Corporation Limited Passenger Vehicle Co.

KeyWords： steel QP980 threshold partition flanging forming edge cracking wrinkling

ClassificationCode：TP386

year,vol(issue):pagenumber：2018,43(1):53-59

Abstract：

The edge cracking in flanging consists of thinning cracking and wrinkling cracking．For the problems of edge cracking in the flanging process of threshold partition part for steel QP980，the basic mechanical properties of sample sheet for cracked part was tested，and the cracking section of part was researched. Then, the whole process simulation of original scheme was performed by software AutoForm, and an optimum scheme of blank was proposed. Furthermore, the new scheme was evaluated on formability，major and minor stain and thinning. In addition, the surface state of die and the trimming quality of cracked part were optimized, and the trial part was punched by the optimum scheme. The results show that after the optimization of blank, the thickness of wrinkling cracking area decreases from 18.6% to 10.4%, and the wrinkling phenomenon is improved. The optimization of die surface state can effectively improve the surface galling of forming part，and the cracking in thinning area is eliminated. The optimized blank was obtained by laser cutting. The wrinkles or cracks cannot be seen in the forming part, and the edge quality of part is improved obviously．Finally, the main factors affecting the edge cracking of flanging for threshold partition part of steel QP980 were summed up, which could guide the design of follow-up parts and ensure the stability of mass production．

Funds：

作者简介：袁志鹏（1987-），男，硕士，工程师，E-mail：yuanzhipeng@baosteel.com

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