Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1988-12-08
1989-11-28
Spruill, Robert L.
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
72359, 10 27PH, B21K 2110
Patent
active
048829250
ABSTRACT:
A method of making terminal nut for ignition plug by plastic working, comprising; first step in which a metallic blank is struck at its end surfaces to flatten the end surfaces in prependicular to axial direction of the blank; second step in which a central conical dent is formed at one end surface of the blank, and forming first bottom-ended hole at other end surface of the blank; third step in which second bottom-ended hole is formed concentrically and continuously from the first bottom-ended hole at the blank to be diametrically lesser than the first bottom-ended hole; fourth step in which the blank is axially contracted to diametrically bulge outward by upsetting; fifth step in which a perforation hole is axially formed at the blank by punching in concentrical relationship with the first bottom-ended hole; sixth step in which the blank is shaved at its bulged portion.
REFERENCES:
patent: 3101534 (1963-08-01), Lange
patent: 3186209 (1965-06-01), Friedman
patent: 3188849 (1965-06-01), Wisebaker et al.
patent: 4352283 (1982-10-01), Bailey
Ando Minoru
Ichie Tsugumi
NGK Spark Plug Co. Ltd.
Spruill Robert L.
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