HYDROSTATIC PRESSING METHOD Russian patent published in 1995 - IPC

FIELD: powder metallurgy. SUBSTANCE: method of hydrostatic pressing of powder blanks with outer diameters 150-300 mm comprises steps of placing the blank on a base; securing over the base an elastic envelope with dimension of cover, equal to 360 mm; fastening over the envelope a rigid hood with diameter 420 mm; at first evacuating a cavity, being adjacent with an inner surface of the envelope, up to a vacuum degree, equal to 0.92 kg/square cm; providing formation of a corrugation with a height, equal to 15-30 mm; then creating a vacuum over an outer surface of the envelope at maintaining the vacuum degree in the inner cavity, in such a way, that to provide contact of the envelope with the blank; then applying to the blank a hydrostatic pressure. EFFECT: enhanced efficiency. 1 cl, 3 dwg