Analysis of draw–redraw processes

An analytical model is developed to analyze the draw–redraw processes. Thickening of the flange is modeled using a complete pure radial drawing analysis which takes into account interfacial friction and radial thickness variation. A plastic bending analysis is used to calculate thinning in all forming radii. Material properties, tooling geometry, and process parameters are included in the model. The derivation is then developed into computer subroutines. By arranging the subroutines into the deforming sequence, draw–redraw process can be simulated. The predicted wall thickness profiles agree very well with the experimental measurements. Characterization of wall thickness profile is also discussed.