Cold Forging of Metal Powder Preforms

This paper reviews the state of the art of cold forming porous preforms into net or near-net shapes for structural applications. Materials discussed include ferrous and aluminum powders. Processes include both bulk and localized cold forming. Analysis of densification and deformation for cold forming of axisymmetric cup shapes, hubs and flanges is presented. Empirically based relationships concerning proper preform design are extended to more complex shapes.