Hot-forging small inner diameter powdered metal parts

Details Hot-forging small inner diameter powdered metal parts Hot-forging small inner diameter powdered metal parts

1986-01-30

1987-05-19

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Heat and pressure simultaneously to effect sintering

419 28, 419 50, 29 34R, 29DIG18, 72 38, 72342, 72352, 72353, 72358, 72364, 72375, B22F 324

Patent

active

046666656

ABSTRACT:
An apparatus and method of hot-forging in a forging press a cylindrical powdered metal preform to substantially full theoretical density to thereby produce a powdered metal part having a small inner bore wherein the core rod defining such bore is constructed so as to allow a continuous flow of a highly vaporizable liquid coolant such as nitrogen to the metal forming portion of the core rod and to thermally insulate the incoming coolant to assure its being maintained substantially unvaporized until being expelled to the core rod cooling chamber.

REFERENCES:
patent: 2950816 (1960-08-01), Arenz
patent: 3360975 (1968-01-01), Edgecombe
patent: 3364707 (1968-01-01), Foerster
patent: 3455137 (1969-07-01), Edgecombe
patent: 3735648 (1973-05-01), Haller
patent: 3761257 (1973-09-01), Dunn
patent: 4002471 (1977-01-01), Sarnes et al.
patent: 4051590 (1977-10-01), Halter et al.
patent: 4270951 (1981-06-01), Suh et al.
patent: 4510788 (1985-04-01), Ferguson et al.
patent: 4571977 (1986-02-01), Veno et al.

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