Method for producing a metal tip

• Main Authors: KATOH; AKIO, HAMADA; KAZUO
• Format: Patent
• Language: English
• Published: 02.04.1996
• Edition: 6
• Subjects: AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL; BASIC ELECTRIC ELEMENTS; BLASTING; COMBUSTION ENGINES; CORONA DEVICES; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES; LIGHTING; MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES,RIVETS, BOLTS OR WHEELS; MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING; MECHANICAL ENGINEERING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; OVERVOLTAGE ARRESTERS USING SPARK GAPS; PERFORMING OPERATIONS; PUNCHING METAL; SPARK GAPS; SPARKING PLUGS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES; TRANSPORTING; WEAPONS

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.