Transactions of Materials and Heat Treatment

Title：Bending springback of U-shaped part for 6014 aluminum alloy

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ClassificationCode：TG146.21

year,vol(issue):pagenumber：2021,46(10):88-92

Abstract：

In order to control and reduce the springback phenomenon in the stamping process of U-shaped part for 6014 aluminum alloy and improve the strength and mechanical properties of formed part, the bending experiment of 6014 aluminum alloy samples was carried out, and the aging treatment of bended samples was carried out and then analyzed. The influences of blank initial temperature, die working temperature, blank holder force and holding time after bending on springback were investigated in the bending experiment. The results show that the main factors affecting the springback are blank initial temperature and die working temperature in the forming process, and the springback decreases as the temperature rises. Through stepwise regression analysis, the relationship among springback amount θ, blank initial temperature T1 and die working temperature T2 is θ=5.52206-0.00832T1-0.00231T2. By analyzing the samples, it is found that the hardness of hot stamping sample is not much different from the hardness of formed sample at room temperature, and both are similar to the T4 state of original sheet. However, after aging treatment, the hardnesses of hot stamping sample and formed sample at room temperature are both improved, and the former has a great increase. Furthermore, the formed sample after hot stamping and aging treatment has higher hardness, and its mechanical properties are slightly lower than that of the T4 state sheet.

Funds：

国家重大科技专项(2014ZX04002-071)；江西省教育厅科技项目(GJJ201903)

作者简介：沈智（1980-），男，博士，工程师，讲师 E-mail：nickshen009@163.com

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