Closed-die forging method and method of manufacturing forged article

摘要

Provided are: a closed-die forging method capable of preventing a temperature decrease in a to-be-forged member during forging, easy temperature monitoring during forging, and filling the cavity end portions of a die with the to-be-forged member; and a method of manufacturing a forged article using the closed-die forging method. The closed-die forging method includes covering a surface of the to-be-forged member (preferably a super-alloy) that contacts the lower die with a metal heat-insulation member (preferably stainless steel) prior to forging, except for at least a part of the surface that contacts an upper die during forging, placing the heated to-be-forged member on a lower die, and hammer-forging the to-be-forged member integrally with the metal heat-insulation member. A forged article is prepared by heat-treating the forged article obtained by the closed-die forging method (preferably in a disk shape) at temperatures not lower than the recrystallization temperature of the forged article.

主权项

1. A closed-die forging method, comprising:
covering a first surface of a member to be forged with a metal heat-insulation member, wherein the member to be forged has a columnar shape and has a planar lower face a side face, and an upper surface, wherein the first surface comprises the planar lower face and the whole side face of the member to be forged, such that a second surface of the member to be forged, which is at least part of a central top of the upper surface of the member to be forged, is not covered with the metal heat-insulation member; heating the member to be forged to provide a heated member to be forged; placing the heated member to be forged on a lower die, such that the planar lower face of the first surface is in contact with the lower die; and hammer-forging the member to be forged with a reciprocating upper die, such that the second surface is in contact with the reciprocating upper die during the hammer-forging and such that the member to be forged is forged integrally with the metal heat-insulation member wherein the lower die and the upper die form a cavity, and a space is provided outside of the cavity, the metal heat-insulation member exclusively entering the space during the hammer-forging.