Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1977-12-27
1979-09-04
Gilden, Leon
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
10 27E, 72359, 72377, B21D 2200
Patent
active
041663730
ABSTRACT:
The invention relates to the cold extrusion of a part having a polygonal interior and a cylindrical exterior. Instead of the usual process of forcing a polygonal punch into a billet in a single extrusion step, the new method employs a plurality of extrusion steps, first forming a lobed preparatory blank and then in a second extrusion step providing a punch and die combination whereby the external lobes of the intermediate part are forced radially inwardly. In the second extrusion step a polygonal punch is used to provide the proper polygonal interior surface. A cooperating die is provided with an upper lobed cavity for receiving the lobed preparatory blank and this die is oriented with respect to the polygonal punch so that the interior lobes of the die are exactly opposite the flats of the polygonal punch. Below the upper lobed cavity of the die is a cylindrical cavity of smaller diameter and between the two is a conical surface which directs the metal of the lobes inwardly into the die cavity opposite the flats of the polygon. The preferred polygon is a hexagon.
REFERENCES:
patent: 1595588 (1926-08-01), Tuttle
patent: 2774259 (1956-12-01), Caulkins
patent: 2904173 (1959-07-01), Braun et al.
patent: 3842646 (1974-10-01), Kuhn
patent: 4061013 (1977-12-01), Kue
patent: 4078415 (1978-03-01), Koch
Braun Engineering Company
Gilden Leon
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