Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1975-11-20
1977-04-05
Hall, Carl E.
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
72360, 72470, 291592, B21J 106, B21J 500
Patent
active
040154610
ABSTRACT:
The present drop-forging die includes an upper and a lower die member which re pressed together in the forging operation to form a closed cavity of the shape of the finished workpiece without a flash gutter at the interface of the die members. The die is constructed in a manner to force the heated material of the blank to follow a predetermined flow pattern whereby to completely fill the different spaces within the die cavity in a fixed sequence before the material is cooled off enough to cause fabrication defects. More specifically, the material is forced to first flow downwardly to fill a recess in the bottom of the lower die member. Thereafter the cavity elements of the upper die member are filled by a material flow in the opposite direction. For this purpose the blank rests on a narrow annular surface around its bottom edge portion and is mostly unsupported in its center portion above said recess.
REFERENCES:
patent: 2756876 (1956-07-01), Watson et al.
patent: 2953247 (1960-09-01), Walter et al.
patent: 2964838 (1960-12-01), Schober
patent: 2966987 (1961-01-01), Kaul
Bayerische Leichtmetallwerk Graf Bluecher von Wahlstatt KG
Fasse W. G.
Gurley D. M.
Hall Carl E.
Roberts W. W.
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