Continuous extrusion of metals
AssigneeMetal Box Public Limited Company
InventorsJohn East, Ian Maxwell
Life of this patent
Estimating the term…
Abstract
In a continuous extrusion machine in which feedstock is admitted to a peripheral groove in a rotating wheel, is enclosed in that groove by a cooperating shoe, is frictionally dragged along an arcuate passageway formed by said groove and a projecting portion of said shoe towards an abutment carried by said shoe, and is continuously extruded as a metal product through a die, is flash extruded through clearance gaps between cooperating wheel and shoe surfaces, is intercepted and broken off periodically in short lengths by teeth which project radially or transversely from the wheel, the arcuate passageway has a radial depth which progressively decreases in the direction of wheel rotation in a zone extending upstream from the abutment.
Claims13
Apparatus for effecting continuous extrusion of metal from a feedstock in particulate, comminuted or solid form, which apparatus includes:
- (a) a rotatable wheel member (10) arranged for rotation when in operation by a driving means, said wheel member having formed peripherally thereon a continuous circumferential groove (12);
- (b) a cooperating shoe member (24) which extends circumferentially around a substantial part of the periphery of said wheel member and which has a portion (30) which projects in a radial direction partly into said groove with small working clearance (32,34) from the side walls (14) of said groove, said shoe member portion defining with the walls of said groove an enclosed passageway (48) extending circumferentially of said wheel member;
- (c) feedstock inlet means (50,52) disposed at an inlet end of said passageway (48) for enabling feedstock to enter said passageway at said inlet end whereby to be engaged and carried frictionally by said wheel member, when rotating, towards the opposite, outlet end of said passageway;
- (d) an abutment member (36) carried on said shoe member and projecting radially into said passageway (48) at said outlet end thereof so as to substantially close said passageway at that end and thereby impede the passage of feedstock frictionally carried in said groove (12) by said wheel member, thus creating an extrusion pressure in said passageway at said outlet end thereof;
- (e) a die member (40,42) carried on said shoe member and having a die orifice opening (42) from said passageway (48) at said outlet end thereof, through which orifice feedstock carried in said groove (12) and frictionally compressed by rotation of said wheel member (10), when driven, is compressed and extruded in continuous form, to exit from said shoe member (24) via an outlet aperture (60,58);
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- (f) flash-removing means (70) secured on said wheel member (10) for rotation therewith and arranged to periodically intercept and thereby forcibly detach sections of a waste material, which is flash (68), that is being continuously extruded, when the apparatus is in operation, through one or both of two gaps (32,34) which provide the said small working clearances between the said side walls (14) of said groove (12) and the cooperating surfaces of said shoe member portion (30) which projects radially into said groove.
Dependencies are inferred from the claim text.