Method for producing a composite center electrode and an electro

Details Method for producing a composite center electrode and an electro Method for producing a composite center electrode and an electro

1981-10-29

1987-09-22

Wise, Robert E.

Electric lamp and discharge devices

Spark plugs

Plural part center electrode lead-in

313141, H01T 1320

Patent

active

046957596

ABSTRACT:
An improved method is disclosed for forming a composite spark plug electrode having a thermally conductive metal core embedded within a corrosion-resistant metal sheath. Initially, a composite billet is formed by positioning a mass of the thermally conductive metal within a cup formed from the corrosion-resistant metal having a closed end and an open end. The corrosion-resistant metal at the open end of the cup extends further than the thermal conducting metal. The composite billet is passed open end first through an extrusion orifice. A head may be formed on the end of the resulting extrusion for welding to a wire terminal or an end of a wire terminal is positioned within the open cup end prior to passing the cup through the extrusion orifice for mechanically bonding the extrusion to the terminal. Excess metal on the end of the cup may be removed from the resulting composite electrode or it may be sheared from the electrode and repositioned axially along the electrode to form a shoulder.

REFERENCES:
patent: 2849788 (1958-09-01), Creek
patent: 2945293 (1960-07-01), Last
patent: 2955222 (1960-10-01), Beesch
patent: 3040417 (1962-06-01), Newton
patent: 3144576 (1964-08-01), Hagmaier et al.
patent: 3548472 (1970-12-01), Urushiwara et al.
patent: 3818555 (1974-06-01), Yamaguchi et al.
patent: 3857145 (1974-12-01), Yamaguchi et al.

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