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第五届国际材料与热加工物理模拟及数值模拟学术会议

作者： Y.L.Liu1 a G.Y.Zhao1 b C.H.Lu1 b and H.Yang1 c 1College of Materials Science and Engineering Northwestern Polytechnical University P.O.Box 542 Xi’an Shaanxi 710072 P.R. China

The cross section distortion is a main forming defect occurred easily in the bending process of thin-walled rectangular wave-guide tube, consequently results in a poor forming precision and quality. But properly using a mandril is an effective resolution for this problem. So this paper mainly focuses on the role of a mandril in the bending process of thin-walled rectangular wave-guide tube to restrict the cross section distortion by numerical simulation. Firstly, a 3D-FEM model of rotary-draw bending process of aluminum alloy 3A21 thin-walled rectangular tube is developed under the environment of ABAQUS/Explicit, and its reliability is validated by experimental results. Then the influence laws of the mandril and its extension length on cross section distortion have been explored. The achievements of this study have a great significance and reference value for improving forming precision of bending process of thin-walled rectangular wave-guide tube.

关键词： Mandril thin-walled rectangular wave-guide tube Bending process Cross section distortion FEM analysis

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Effects of geometrical parameters on wrinkling of thin-walled rectangular aluminum alloy wave-guide tubes in rotary-draw bending

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Chinese Journal of Aeronautics 2013年第1期26卷 242-248页

作者： Tian Shan Liu Yuli Yang He State Key Laboratory of Solidification Processing Northwestern Polytechnical University

Inner flange and side wrinkling often occur in rotary-draw bending process of rectangular aluminum alloy wave-guide tubes, and the distribution and magnitude of wrinkling is related to geometrical parameters of the tubes. In order to study the effects of geometrical parameters on wrinkling of rectangular wave-guide tubes, a 3D-FE model for rotary-draw bending processes of thin-walled rectangular aluminum alloy wave-guide tubes was built based on the platform of ABA-QUS/Explicit, and its reliability was validated by experiments. Simulation and analysis of the influence laws of geometrical parameters on the wave heights of inner flange and side wrinkling were then carried out. The results show that inner flange wrinkling is the main wrinkling way to rectan- gular wave-guide tubes in rotary-draw bending processes, but side wrinkling cannot be neglected because side wrinkling is 2/3 of inner flange wrinkling when b and h are smaller. Inner flange and side wrinkling increase with increasing b and h; the influence of b on side wrinkling is larger than that of h, while both b and h affect inner flange wrinkling greatly. Inner flange and side wrinkling decrease with increasing R/h; the influence of h on inner flange and side wrinkling is larger than that of R.

关键词： Geometrical parameters Inner flange wrinkling Side wrinkling Simulation thin-walled rectangular wave-guide tube Rotary-draw bending

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