Light metal forging material manufacturing method and forged member manufacturing method using the material

(19)

(11)

EP 1 016 477 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	14.03.2001 Bulletin 2001/11

(43)	Date of publication A2:
	05.07.2000 Bulletin 2000/27

(21)	Application number: 99125044.0

(22)	Date of filing: 15.12.1999

(51)	International Patent Classification (IPC)⁷: B22D 17/00, C22F 1/06

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

28.12.1998 JP 37284098

(71)	Applicant: Mazda Motor Corporation
	Aki-gun, Hiroshima 730-8670 (JP)

(72)	Inventors:
	Sakamoto, Kazuo, c/o Mazda Motor Corporation Aki-gun, Hiroshima 730-8670 (JP) Yamamoto, Yukio, c/o Mazda Motor Corporation Aki-gun, Hiroshima 730-8670 (JP)

(74)	Representative: Zinnecker, Armin, Dipl.-Ing. et al
	Lorenz-Seidler-Gossel, Widenmayerstrasse 23 80538 München 80538 München (DE)

(54)	Light metal forging material manufacturing method and forged member manufacturing method using the material

(57) This invention relates to a method for manufacturing a light metal forging material provided as a material to be subjected to a forging process for obtaining a light metal forged member, by charging a light metal molten material into the molding cavity of a specified molding die so as to form a forging material and subjecting the forging material to a specified heat treatment before the forging process, there is generated a blister attributed to internal gas expansion in the material, thereby, in obtaining a finished product made of light metal by forming a forging material and forging the material, a blister associated with heat treatment is reliably prevented from being generated in a product (forged member) through this forging process.

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