Abstract
This paper describes a mathematical model of the stretch flanging of sheet metal blanks which are initially curved in the shape of a “V.” By assuming that all intermediate flange surfaces are developable and the effect of tool friction is negligible, the deformation in the flange is equivalent to that of an in-plane stretching operation. Strain distributions in the latter are shown to be conveniently calculated by elastic-plastic finite element analyses. To assess the applicability of the model, an existing flanging apparatus was used to produce specimens for a variety of flange configurations with AKDQ steel, HSLA-60 steel, and 2036-T4 aluminum. Comparison of the calculated and measured strain distributions along the free edges of these specimens show that the present model is reasonably accurate to be useful in feasibility studies of the design of sheet metal parts.
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