Determination of working stress and limiting flanging ratio in the hole-flanging process of sheet metal blanks

Abstract

The paper presents an analysis of the conventional hole-flanging process based, on one hand, on a purely theoretical base and, on the other hand, on the experimental one. The original formulae for calculating working stress (force) of the hole-flanging are derived. The theoretical results are compared to the experimental ones thereby their satisfying compliance is identified. Further on, other important parameter of the hole-flanging process-limiting flanging ratio-is also theoretically and experimentally analyzed. For experimental research, a representative high-alloyed stainless steel known for its high cold formability is chosen. The experiment was carried out under the most difficult frictional conditions, that is, with no use of lubricant. The ecommendations to meet the needs of engineering calculations are given.