Method of making copper-clad bimetal electrodes for spark plugs

Details Method of making copper-clad bimetal electrodes for spark plugs Method of making copper-clad bimetal electrodes for spark plugs

1983-11-23

1986-04-29

Godici, Nicholas P.

Electric lamp or space discharge component or device manufacturi

Process

Spark plug or spark gap making

H01J 2102

Patent

active

045854211

ABSTRACT:
A method of making a bimetal electrode for spark plugs on a single progressive header starts with a cylindrical bimetal blank having a diameter substantially equal to that of the finished electrode, with a core of high temperature-resistant metal and an outer layer of highly thermally conductive material, with the outer layer comprising substantially one-third of the material of the blank. In progressive operations, the blank is coned and then headed to a diameter so that the core at the headed portion has a diameter greater than that of the blank. A shearing operation then shears the outer portion of the headed portion and the thermally conductive material away to leave an end for the firing tip having a diameter equal to that of the rest of the blank but consisting essentially of the temperature-resistant core material.

REFERENCES:
patent: 2615441 (1952-10-01), Bychinsky
patent: 2898395 (1959-09-01), Schurecht
patent: 3119944 (1964-01-01), Lentz et al.
patent: 3252207 (1966-05-01), Gwyn, Jr.
patent: 3857145 (1974-12-01), Yamaguchi et al.
patent: 3889366 (1975-06-01), Shibata
patent: 4351095 (1982-09-01), Davies
patent: 4446618 (1984-05-01), Bollian

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