Method of manufacturing a center electrode for a spark plug

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

1992-11-20

1993-12-28

Rosenbaum, Mark

Electric lamp or space discharge component or device manufacturi

Process

Spark plug or spark gap making

313141, 21912164, H01T 2102

Patent

active

052734749

ABSTRACT:
In a method of manufacturing a center electrode for a spark plug, a composite column is provided by enclosing a heat-conductor core into a nickel-alloyed clad by means of plastic working. A front end of the nickel-alloyed clad is severed to define a severing and surface with which an axial bore is provided to reach to a front end of the heat-conductor core. A straight neck portion around the axial bore is provided by diametrically reducing the front end of the nickel-alloyed clad. A firing tip made of precious metal is placed in the axial bore. A front end of the firing tip extends beyond the front end of the straight neck portion, while a rear end of the firing tip comes to be in thermally transferable contact with the front end of the heat-conductor core. An outer surface of the firing tip is bonded to an inner surface of the axial bore by means of laser beam welding or electron beam welding.

REFERENCES:
patent: 2217825 (1940-10-01), Twining et al.
patent: 2783409 (1957-02-01), McDougal
patent: 4786267 (1988-11-01), Toya et al.
patent: 4859827 (1989-08-01), Coyle, Jr. et al.
patent: 4868365 (1989-09-01), Farone et al.
patent: 4893051 (1990-01-01), Kondo

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