吉林大学学报(工学版) ›› 2013, Vol. 43 ›› Issue (06): 1546-1550.doi: 10.7964/jdxbgxb201306019

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Stretch bend forming defects of stainless steel profiles of metro vehicles

WANG Sheng-man1,2   

  1. 1. College of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China;
    2. Changchun Railway Vehicles Co., Ltd. Changchun 130061, China
  • Received:2012-12-07 Online:2013-11-01 Published:2013-11-01

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Abstract:

The stretch bend forming process of stainless steel roof beam of metro vehicle is studied by simulation. The causes and controlling methods of the forming defects such as wrinkles, cross-section distortions and low precision of profile are investigated. Results show that the effects of pre- and post-stretching elongation on wrinkling defect are not evident, while, increasing the wrap stretching elongation can reduce wrinkling defects effectively. Compensation to the cross-section shrinkage of the profile can eliminate the cross-section distortion of the eversion of small edge. Adopting reasonable process parameters of stretch bending and precisely compensated bending mold can reduce springback obviously;therefore, the profile precision is improved and the stretch bending parts with high quality are obtained.

Key words: materials synthesis and processing technology, stainless steel profile, stretch bend forming, process defects, numerical simulation

CLC Number: 

  • TG386

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