Improvement of hem quality by optimizing flanging and pre-hemming operations using computer aided die design

Livatyali H., MUDERRISOGLU A., AHMETOGLU M., AKGERMAN N., KINZEL G., ALTAN T.

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, cilt.98, sa.1, ss.41-52, 2000 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 98 Sayı: 1
  • Basım Tarihi: 2000
  • Doi Numarası: 10.1016/s0924-0136(99)00304-0
  • Dergi Adı: JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.41-52
  • Anahtar Kelimeler: sheet metal forming, sheet bending, hemming, automotive assembly, FEM, CAD
  • Yıldız Teknik Üniversitesi Adresli: Hayır

Özet

Flanging and hemming of straight edge-flat surface (plane strain) aluminum killed-draw quality steel was investigated restricting the study to the radius flat hem with an inner sheet. The major process parameters in straight edge hemming were determined and relations between them and some forming defects were established. Among these parameters were flanging die corner radius, pre-hem path, pre-hem stroke and final hemming force. Possible process and tool design modifications, which may lead to quality improvements in hemming were tested experimentally and using FEM. The commercial finite element program DEFORM was used to simulate the flanging and hemming operations including springback, and the predictions were compared with limited experimental results. Results of the experiments and simulations were summarized in the form of trend-lines for the use of process and die designers. (C) 2000 Elsevier Science S.A. All rights reserved.