Transactions of Materials and Heat Treatment

Title：Numerical simulation and structure improvement of hot stamping for automobile front anti-collision beam

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ClassificationCode：TG306

year,vol(issue):pagenumber：2020,45(7):58-65

Abstract：

In order to obtain the front anti-collision beam structure suitable for hot stamping, a structure improvement scheme was proposed based on the cold stamping model of a certain SUV automobile anti-collision beam, and the hot forming of automobile front anti-collision beam was simulated numerically by software Dynaform. Then, the finite element model and material model of thermo-force-phase coupling were established, and the thinning rate, mechanical properties, temperature field and microstructure distribution of front anti-collision beam were analyzed. The results show that the maximum thinning rate of sheet decreases from 29.47% to 14.78% after improvement to avoid cracking at transition fillet, and the forming quality is significantly improved. After forming, the temperature field in the cross section of sheet has a symmetric distribution, the temperatures at the die fillet and the bottom center are higher, and the temperatures of two ridges are lower. However, during the forming process, there is a temperature difference in the front anti-collision beam, the different cooling rates at different locations of cross section are different, and the cooling rate at all locations is greater than 30 ℃·s-1 to meet the condition of martensitic transformation. After the pressure-holding quenching, except for the edge part of sheet, the martensite content of other parts reaches 100% to meet the strength requirements of hot stamping parts.

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陈泽中（1971-），男，博士，副教授 E-mail：zzchen@usst.edu.cn 通讯作者：周燕芳（1995-），女，硕士研究生 E-mail：amesy_zh@163.com

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