Method of and apparatus for extruding a billet of a light metal

Details Method of and apparatus for extruding a billet of a light metal Method of and apparatus for extruding a billet of a light metal

1994-12-21

1996-02-13

Larson, Lowell A.

Metal deforming

By extruding through orifice

With metal-deforming other than by extrusion

722531, 72467, B21C 2300, B21C 300

Patent

active

054904080

ABSTRACT:
A method of, and an apparatus for extruding a billet of a light metal alloy, wherein the billet has an outer diameter smaller than a maximum configuration width and larger than a minimum configuration width of the die hole at its entry side. The billet is pressurized and extruded by a stem to form a preshaped portion which is larger than the entry side configuration of the die hole, at a frontal end portion of the billet near an entry portion of the die hole. The preshaped portion of the billet is subsequently shaped by the die hole into an extruded shape corresponding to the cross-sectional shape of the die hole and of parts formed from the extruded billet, e.g., of an automobile suspension arm. A reduced resistance and a minimized extrusion pressure upon extrusion of a light metal alloy result from the preshaping of the billet and enable realization of a compact and less expensive arrangement of the production facility.

REFERENCES:
patent: 3983731 (1976-10-01), Sundmar
patent: 3999415 (1976-12-01), Austen
patent: 4550584 (1985-11-01), Degen
patent: 4773251 (1988-09-01), Kohnhauser
patent: 4829802 (1989-05-01), Baumann

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