Deformation behaviors of 21-6-9 stainless steel tube numerical control bending under different friction conditions

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• 作者：Jun Fang ; Shi-qiang Lu ; Ke-lu Wang …
• 关键词：21 ; 6 ; 9 stainless steel tube ; friction ; deformation behaviors ; numerical control bending ; finite element simulation
• 刊名：Journal of Central South University of Technology
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：22
• 期：8
• 页码：2864-2874
• 全文大小：1,797 KB
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• 作者单位：Jun Fang (1)
  Shi-qiang Lu (2)
  Ke-lu Wang (2)
  Zheng-jun Yao (1)
  
  1. Institute of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, China
  2. School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang, 330063, China
  
• 刊物类别：Engineering
• 刊物主题：Engineering, general
  Metallic Materials
  Chinese Library of Science
  
• 出版者：Central South University, co-published with Springer
• ISSN：2227-5223

文摘

For contact dominated numerical control (NC) bending process of tube, the effect of friction on bending deformation behaviors should be focused on to achieve precision bending forming. A three dimensional (3D) elastic-plastic finite element (FE) model of NC bending process was established under ABAQUS/Explicit platform, and its reliability was validated by the experiment. Then, numerical study on bending deformation behaviors under different frictions between tube and various dies was explored from multiple aspects such as wrinkling, wall thickness change and cross section deformation. The results show that the large friction of wiper die–tube reduces the wrinkling wave ratio η and cross section deformation degree ΔD and increases the wall thinning degree Δt. The large friction of mandrel–tube causes large η, Δt and ΔD, and the onset of wrinkling near clamp die. The large friction of pressure die–tube reduces Δt and ΔD, and the friction on this interface has little effect on η. The large friction of bending die–tube reduces η and ΔD, and the friction on this interface has little effect on Δt. The reasonable friction coefficients on wiper die–tube, mandrel–tube, pressure die–tube and bending die–tube of 21-6-9 (0Cr21Ni6Mn9N) stainless steel tube in NC bending are 0.05-.15, 0.05-.15, 0.25-.35 and 0.25-.35, respectively. The results can provide a guideline for applying the friction conditions to establish the robust bending environment for stable and precise bending deformation of tube bending.