Abstract
Production problems of the autobody door inner panel in the press shop is investigated with aid of the circle grid analysis. The aim is to reduce the scrap rate. The strain distribution and the strain history in the severe deformed area is determined. Strains are compared with the limit strains in the form of the forming limit diagrams. Two forming limit diagrams (FLDs) are determined for two sheet metal blank orientations to the rolling direction α=90° and α=0°, respectively. Mathematical statistics is used for evaluating of experimental data. Statistically significant difference between forming limit curves is appreciated and the formability stock in the range of various strain states through FLD is determined. Also strain history in the investigated area of the stamped part is determined.
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