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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 4    August 2006

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Effect of frictions on cross section quality of thin-walled tube NC bending
YANG He(杨 合), GU Rui-jie(谷瑞杰), ZHAN Mei(詹 梅), LI Heng(李 恒)

College of Materials Science and Engineering, Northwest Polytechnic University, Xi’an 710072, China

Abstract: The effect of frictions between dies and tube on the cross section quality of thin-walled tube numerical controlled(NC) bending was studied by numerical simulation method, combined with theoretical analysis and experiment. The results show that the frictions between mandrel, wiper, pressure die, bending die and tube have a significant and complicate effect on the section quality of thin-walled tube NC bending. To improve the section quality, frictions between mandrel, wiper and tube should be decreased, but the frictions between the pressure die, bending die and tube increase. The effect on the section distortion is more significant from mandrel, wiper, pressure die to bending die and the effect on the wall thinning more significant from mandrel, pressure die, wiper, to bending die. The effects of frictions between all dies and tube on wall thinning are smaller than their effects on section distortion. Mandrel and wiper should be lubricated well and drawing oil is used to lubricate them in actual production. The frictions between pressure die, bending die and tube should be increased and the dry friction is used between pressure die, bending die and tube in actual production.

 

Key words: thin-walled tube; tube NC bending; friction; cross section quality

ISSN 1672-7029
CN 43-1423/U

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