Experimental investigation on forming defects in flat surface-convex edge hemming: roll, recoil and warp

Livatyali H., LARRIS S.

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, vol.153, pp.913-919, 2004 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 153
  • Publication Date: 2004
  • Doi Number: 10.1016/j.jmatprotec.2004.04.425
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.913-919
  • Keywords: sheet metal forming, hemming, fractional factorial experiments
  • Yıldız Technical University Affiliated: No


Forming defects, roll and warp, in hemming of mild steel sheets with flat surface-convex edge geometry are experimentally investigated. The objectives in this study were to develop fundamental knowledge of the effects of process parameters on the final hem quality (defects including roll-in/out, recoil and warp without wrinkling and hem-out) and to develop improved process and tool design rules for flanging and hemming based on experimental findings. The experiments were designed using half a fractional factorial array with four 2-level factors replicated three times. All main effects were determined as well as non-alias 2-level interactions. Results of the experiments were summarized for the use of process and die designers. (C) 2004 Elsevier B. V. All rights reserved.