Elastic-plastic finite element investigation of the effect of the aspect ratio on curvature in the roll-platen forming process

The roll-platen forming process is a novel process aimed at producing elong ated components to net shape or near net shape. Systematic research has bee n conducted: (1) to establish the general mass flow mode under various proc ess parameters by physical modelling; (2) to further investigate the effect of speed ratio and aspect ratio on curvature of hot steel roll-platen form ed components by finite element simulation. This paper presents the results of FE investigation of the effect of aspect ratio on curvature including t he characteristics of progressive deformation, the development and distribu tion of generalised plastic strain, and the deformed workpiece shape. These simulated curvature results agree closely with those of physical modelling experiments. Some special boundary techniques developed for this FE modell ing will also be briefly mentioned in this paper. (C) 2000 Published by Els evier Science S.A.