Metal deforming – With cutting – By composite tool
Patent
1994-03-14
1996-04-02
Crane, Daniel C.
Metal deforming
With cutting
By composite tool
72358, 29874, B21D 2810
Patent
active
055029949
ABSTRACT:
A cold forging apparatus for producing a metal tip for use, for example, in an electrode of a spark plug includes an intermediate die for receiving a metal blank, an upper die having a punch for forming a recess in the metal blank, and a lower die movable in a lateral direction. A press member is mounted on the lower die, and is retracted when a projection, extruded from the metal tip by the punch, is brought into pressing engagement with the press member. The punch is driven into the metal blank to form a recess and the projection respectively on upper and lower surfaces of the metal blank, and subsequently in a hydrostatic condition, the lower die is moved laterally to remove the projection from the metal blank.
REFERENCES:
patent: 1691878 (1928-11-01), Blakeslee
patent: 4352283 (1982-10-01), Bailey
patent: 4435973 (1984-03-01), Nakazawa
patent: 4575343 (1986-03-01), Kin
Hamada Kazuo
Katoh Akio
Crane Daniel C.
Kataken Seiko Co., Ltd.
Nippondenso Co. Ltd.
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