Abstract— This paper describes experimental results for the forming limits for steel sheet DC 04 (KOHAL 200) and the deformation states in large-sized autobody panels of the Skoda, with examples of the application of these results to the analysis of an actual press forming operation. The forming-limit diagram (FLD) was determined using the in-plane stretching method. The deformation states in the large-sized autobody panels were marked on the FLD and compared with the limit strains of the sheet metal tested. Since successful forming requires the right combination of material, lubrication, sheet-blank configuration and die design, the trial-and-error method was used to determine the proper forming parameters. By analysing the strain patterns, it was possible to obtain the changes needed to convert an unfavourable stamping into a favourable one.
Keywords— Autobody stampings, forming limit diagram, major- and minor-strain.
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