Transactions of Materials and Heat Treatment

Title：Hot forming technology of inner concave tube beam for automobile

Authors： Yu Hongbing Zhang Yaqi Yang Xingyuan Shang Kai

Unit： Baotou Vocational and Technical College The Technology Centrl of Dongfeng Motor

KeyWords： inner concave tube beam hot forming gas bulging undercut martensite content Vickers hardness grain size

ClassificationCode：TG386.1

year,vol(issue):pagenumber：2019,44(6):59-64

Abstract：

For the inner concave tube beam, a hot forming method combining with gas bulging was proposed. Firstly, according to the structural features of the inner concave tube beam, the corresponding analysis difficulties were given. Secondly, considering the defects produced by the undercut and not fit the die at the rounded corners when there was no mechanical support inside the tube beam, the inside of the tube blank was filled with gas before the die clamping, and the auxiliary support was supported to ensure that the tube blank of the fractal surface fully flowed into the concave cavity. Then, the width of undercut edge, fillet fit gap and maximum thinning rate were taken as evaluation indexes, and the contour maps of three indexes were constructed on the closed stroke-internal pressure plane of the die. Furthermore, the optimum combination of stroke and internal pressure for the die was determined according to the distribution of contour maps. Finally, martensite content, Vickers hardness and grain size after the tube forming under the different gas pressures were analyzed, and the forming method proposed for the tube beam was verified by experiments. The result shows that the forming quality is the best when the gas pressure is 8 MPa.

Funds：

国家自然科学基金资助项目（61374196，51178053）；教育部长江学者和创新团队发展计划项目(IRT1286)

于洪兵（1979-），男，硕士，副教授 E-mail：408015535@qq.com 通讯作者：张亚岐（1986-），男，硕士，工程师 E-mail：zyq211985@163.com

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