Method for producing a metal tip
AssigneesNippondenso Co., Ltd., Kataken Seiko Co., Ltd.
InventorsAkio Katoh, Kazuo Hamada
Life of this patent
Estimating the term…
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.
Claims14
A method of producing a metal tip having a recess formed therein, the method comprising the steps of:
- providing a metal blank having opposing first and second ends;
- driving a punch partway into the first end of the metal blank toward the second end thereof, thereby forming the recess, whereby a portion of the metal of the metal blank is displaced by the punch to form a projection extending from the second end of the metal blank in alignment with the recess;
- and
- separating the projection from the metal blank while maintaining the recess formed therein and while applying a force to all surfaces of the metal blank.
A method of producing a metal tip having a recess formed therein, the method comprising the steps of:
- inserting a metal blank into a die so as to have a substantially conformal fit between the metal blank and the die;
- driving a punch partway into a first side of the metal blank received in the die thereby forming the recess in the metal blank, whereby a part of the metal of the metal blank is displaced so as to form a projection extending from a second side of the metal blank opposite from the first side and in alignment with the recess;
- and
- separating the projection from the metal blank by shearing while applying a force to all surfaces of the metal blank thereby forming the metal tip with a recess formed therein.
Dependencies are inferred from the claim text.