Study on the bulging deformation of the porous metal in upsetting

Forging of sintered porous powder is currently popular in many parts of the world as an economic method of producing high strength, high ductility parts from mental powder. The upsetting of porous metal is one of the main processes in powder forging. It is important to understand the upsetting bulging and the density variation of the billet in the forging of porous metal. In this paper, the finite element method is used to investigate the bulging deformation, forging force and density variation of the porous metal in upsetting. The influences of the parameters such as the initial height, the initial diameter, the initial relative density of the billets and the friction coefficient on the bulging deformation, forging force and the variation of relative density in the billets are also examined.