Metal deforming – Process – With attenuation – thickening – elongating or shortening of...
Reexamination Certificate
2007-08-21
2007-08-21
Suhol, Dmitry (Department: 3725)
Metal deforming
Process
With attenuation, thickening, elongating or shortening of...
C072S358000, C072S352000, C072S356000, C072S359000
Reexamination Certificate
active
10473299
ABSTRACT:
A closed forging method for producing a forged product includes preparing as a forging material a cylindrical cast ingot that has a volume the same as the volume of a forged product and assumes a shape having an upper surface, a lower surface and a side surface and containing no angular portion; and applying pressure to the side surface of the forging material. The shape has a ratio of the lateral length of a projection profile of the forging material as viewed in the direction perpendicular to the direction of pressure application to a length of the forging material as measured in the direction of pressure application is 1 or less. The forged product obtained is a preform of an upper arm or a lower arm with a plurality of branches that is a suspension part for a vehicle or a yoke with a plurality of branches that is a joint part employed in a vehicle suspension. The preform or yoke has metal flow lines along each branch and exhibits enhanced mechanical strength.
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English-language Patent Abstracts of Japan, abstracting JP 06-071373, published Mar. 15, 1994.
Machine translation of JP 06-071373, published Mar. 15, 1994.
Nakahara Takafumi
Natsui Masayuki
Showa Denko K.K.
Suhol Dmitry
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