CLOSED-DIE AXISYMMETRICAL FORGING OF SINTERED ALUMINUM PREFORMS

The present work deals with an investigation into the closed-die forgi ng of Aluminium powder preforms that have been compacted and sintered from very fine aluminium powder. The sintered preforms, of the same di ameter but of different lengths, have been pressed in the cold conditi on. It is seen that the resistance to flow of the metal into the flash gap can be expressed in terms of the normal stress developed at the j unction of the flash and the body of the forging. It appears that ther e exists a direct relationship between the normal stress and the flash thickness. (C) 1997 Elsevier Science S.A.