吉林大学学报(工学版) ›› 2018, Vol. 48 ›› Issue (1): 221-228.doi: 10.13229/j.cnki.jdxbgxb20170021

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Effect of multi-point punch active loading path on the stretch-forming of sheet

LIU Chun-guo, LIU Wei-dong, DENG Yu-shan   

  1. Roll Forging Research Institute, Jilin University, Changchun 130022,China
  • Received:2017-01-06 Online:2018-02-26 Published:2018-02-26

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Abstract: In This paper the influences of three different loading paths on the quality of stretch- forming were studied. Based on the plane strain assumption, the s tress state of Al alloy sheet between multi-point stretch-forming and equidifferent-curvature punch active loading stretch-forming were compared and analyzed. The strain, stress, elongation distribution of the multi-point stretch-forming and the multi-point punch active loading stretch-forming under three different loading conditions were studied by numerical simulation. Results show that, compared with the multi-point stretch-forming, constant velocity punch active loading, isochronous punch active loading and equidifferent-curvature punch active loading can not only reduce the stress concentration in the position between the sheet and jaw, but also improve the uniformity of the distribution of stress, strain and elongation. The results confirm that equidifferent-curvature punch active loading method can achieve the best formability of Al alloy sheet.

Key words: materials synthesis and processing technology, multi-point die, loading path, stretch-forming, numerical simulation

CLC Number: 

  • TG386.41
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