Method for manufacturing a center electrode for a spark plug

Details Method for manufacturing a center electrode for a spark plug Method for manufacturing a center electrode for a spark plug

H - Electricity

01

T

26/112

H01T 21/02 (2006.01)

Patent

CA 1298460

METHOD FOR MANUFACTURING A CENTER ELECTRODE FOR A SPARK PLUG ABSTRACT OF THE DISCLOSURE A method of manufacturing an electrode (40) for a spark plug. A cylindrical length (10) of inconel wire has a first end (12) with a flat surface thereon. The inconel wire (10) is placed in a die and partially ex- truded to create a cylindrical bore (16) that extends from a second end (l4) toward the first end (12). A strip of platinum (18) is welded to the flat surface (12) after which a chamfering (22) operation removes any ex- cess platinum and weld flash to produce a cylindrical tip (18) on said first end. The inconel wire (10) with its platinum tip (18) is placed in a die and struck with a force causing the cylindrical bore (16) to be extended while the platinum flows (24) along the chamfer (22) to completely cover the weld (20). A copper core (26) is inserted in said cylindrical bore (16) and then further struck to extrude the resulting electrode (36) to a de- sired length.

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