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Cross-sectional distortion behaviors of thin-walled rectangular tube in rotary-draw bending process

Transactions of Nonferrous Metals Society of China 2010年第3期20卷 484-489页

作者：赵刚要刘郁丽杨合卢彩红 College of Materials Science and Engineering State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical University

The cross-sectional distortion usually appears during rotary-draw bending process of thin-walled rectangular tube with small bending *** study the cross-sectional distortion of the tube,a three-dimensional finite-element model of the process was developed based on ABAQUS/Explicit code and its reliability was validated by ***,the cross-sectional distortion behaviors of the tube were *** results show that a zone of larger circumferential stress appears on the tube when bending angle reaches 30°.And in the larger circumferential stress zone,the sagging phenomenon is produced *** maximum cross-sectional distortion is located in the larger circumferential stress zone and the angle between the plane of maximum cross-sectional distortion and the bending reference plane is about 50°.The position of the maximum cross-sectional distortion keeps almost unchanged with the variation of the clearances between dies and tube.

关键词： thin-walled rectangular tube aluminum alloy 3A21 rotary-draw bending cross-sectional distortion die clearance

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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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