Method of forming spark plug bodies

Details Method of forming spark plug bodies Method of forming spark plug bodies

1981-03-06

1982-10-05

Gilden, Leon

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

72356, 72358, 72370, 72377, B21D 2200

Patent

active

043522831

ABSTRACT:
A method of manufacturing a hollow spark plug body having a cylindrical central portion (28), a first end portion (10) of smaller circular radial cross-section and a second end portion of non-circular radial cross-section, e.g. hexagonal, and of smaller maximum diameter than the central portion by cold extruding the both end portions. The second end portion is extruded in two stages, the first involving the formation of a recess in one end of a cylindrical blank, the second involving extrusion the blank between a die (19) and a mandrel (21) which moves with the blank during extrusion.

REFERENCES:
patent: 3101534 (1963-08-01), Lange
patent: 3122831 (1964-03-01), Bailey et al.
patent: 3186209 (1965-06-01), Friedman
patent: 3188849 (1965-06-01), Wisebaker
patent: 3491576 (1970-01-01), Oguri
patent: 3974677 (1976-08-01), Caslellani
patent: 4094183 (1978-06-01), Meltler
patent: 4291568 (1981-09-01), Stifano

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