Predictions of the minimum relative depth of die cavity and the minimum amount of preforming in the radial extrusion of tubular components

Abstract

In this study, both the minimum relative depth of die cavity and the minimum amount required in preforming are determined to produce a defect-free product of tubular component in the preforming technique of radial extrusion. This scheme is based on the least amount of material dissipation in radial extrusion of tubular component. A finite element based code is utilized to investigate the effects of various amount of relative deformation and different relative depths of die cavity on the material flow characteristics resulting in the movements of the defects locations. An algorithm is thus developed for the determination of minimum relative depth of die cavity and the minimum amount required in preforming, and the abductive network is also applied to synthesize the data sets obtained from the numerical simulations through the algorithm proposed in this study. Consequently, a prediction model is established for organizing the minimum relative depth of die cavity and the related minimum amount of preforming of the tubular component that the locations of induced defects are just coincided with the inner surface of the tube at the end stroke of deformation.