Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 20    No. 3    March 2010

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Cross-sectional distortion behaviors of thin-walled rectangular tube in
rotary-draw bending process
ZHAO Gang-yao(赵刚要), LIU Yu-li(刘郁丽), YANG He(杨 合), LU Cai-hong(卢彩红)

College of Materials Science and Engineering, State Key Laboratory of Solidification Processing,
Northwestern Polytechnical University, Xi’an 710072, China

Abstract:The cross-sectional distortion usually appears during rotary-draw bending process of thin-walled rectangular tube with small bending radius. To 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 experiment. Then, the cross-sectional distortion behaviors of the tube were investigated. The 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 obviously. The 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.


Key words: thin-walled rectangular tube; aluminum alloy 3A21; rotary-draw bending; cross-sectional distortion; die clearance

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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