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

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. 3; pp. 484 - 489
• Main Author: 赵刚要 刘郁丽 杨合 卢彩红
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2010; College of Materials Science and Engineering, State Key Laboratory of Solidification Processing,Northwestern Polytechnical University, Xi'an 710072, China
• Subjects: ABAQUS软件; aluminum alloy 3A21; Bending; Circumferences; Cross sections; cross-sectional distortion; die clearance; Distortion; Finite element method; rotary-draw bending; Stresses; Thin walled; thin-walled rectangular tube; Tubes; 三维有限元模型; 变形行为; 弯曲过程; 截面畸变; 横截面变形; 薄壁矩形管; cross-sectional distortion; aluminum alloy 3A21; die clearance; thin-walled rectangular tube; rotary-draw bending
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(09)60166-7

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.