CLOSED-DIE FORGING METHOD AND METHOD OF MANUFACTURING FORGED ARTICLE

Title:

CLOSED-DIE FORGING METHOD AND METHOD OF MANUFACTURING FORGED ARTICLE

Document Type and Number:

WIPO Patent Application WO/2012/090892

Kind Code:

A1

Abstract:

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 causing cavity end portions of a die to be filled 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, which involves placing a heated to-be-forged member on a lower die and hammer-forging the to-be-forged member with a reciprocating upper die, includes covering the whole of a portion of the to-be-forged member that contacts the lower die with a metal heat-insulation member prior to forging, except for at least a part of a portion that contacts an upper die during forging, and then forging the to-be-forged member integrally with the metal heat-insulation member. Preferably, the to-be-forged member is a high heat resistance alloy and the metal heat-insulation member is stainless steel. Further preferably, the to-be-forged member is forged into a disc shape. The method of manufacturing a forged article includes heat-treating a forged material obtained by the closed-die forging method at temperatures not lower than recrystallization temperature.

Inventors:

SHIGIHARA YUSUKE (JP)
SATO KOJI (JP)

Application Number:

PCT/JP2011/079988

Publication Date:

July 05, 2012

Filing Date:

December 26, 2011

Export Citation:

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Assignee:

HITACHI METALS LTD (JP)
SHIGIHARA YUSUKE (JP)
SATO KOJI (JP)

International Classes:

B21J5/02; B21J1/02; B21K1/32

Foreign References:

JPS62286636A	1987-12-12
JPH07179909A	1995-07-18
JPH06122036A	1994-05-06
JPH05177289A	1993-07-20
JP2000051987A	2000-02-22

Other References: