Metal deforming – By extruding through orifice – By rotating impeller means
Patent
1996-11-18
1998-09-29
Hail, III, Joseph J.
Metal deforming
By extruding through orifice
By rotating impeller means
72264, B21C 2300
Patent
active
058132708
DESCRIPTION:
BRIEF SUMMARY
This invention relates to apparatus for the forming of metals by a continuous extrusion process in which feedstock is introduced into a circumferential groove in a rotating wheel to pass into a passageway formed between the groove and arcuate tooling extending into the groove.
EP-A-071 490 discloses continuous extrusion apparatus having a rotatable wheel formed with a circumferential groove, arcuate tooling bounding a radially outer portion of the groove provided with an exit aperture in a die top and an abutment displaced in the direction of rotation from the exit aperture.
According to the present invention the die top is formed with a part cylindrical face arranged to co-act with a portion of the cylindrical surface of the rotatable wheel and, remote from the part cylindrical face, a face having a central recess, extrusion mandrel die means are positioned in the recess with an extrudate supply chamber formed in the recess discharging directly to the extrusion mandrel die means with port means connecting the extrudate supply chamber to the circumferential groove in the rotatable wheel and an extrusion mandrel die piece is positioned centrally of the recess on a bolt threaded into the die top from the recess.
Preferably, a boss is positioned centrally of the recess to receive the bolt and is formed with a frusto-conical seating co-acting with a corresponding face on the mandrel die piece to seat and centrally locate the mandrel die piece on the boss.
Desirably, a die support ring carrying a cylindrical die is positioned in the recess co-axially of the mandrel die piece to provide an extrusion orifice intermediate the cylindrical die and the mandrel die piece.
Suitably, downstream of a surface portion bounding the extrusion orifice, the cylindrical die and the die support ring are formed with an outwardly diverging surface portion.
Advantageously, the rotatable wheel is formed with a plurality of circumferential grooves. Where an even number of circumferential grooves is provided the recess may be positioned with a central axis intermediate the circumferential grooves.
Thin-walled copper tubing may be produced using a copper feed stock and an annular extrusion orifice.
The invention will now be described, by way of example, with reference to the accompanying, partly diagrammatic drawings, in which :
FIG. 1 is a cross-sectional side elevation of the continuous extrusion apparatus partly offset from a plane through one groove of a pair of grooves in a wheel to a plane extending centrally of the pair of grooves through an extrusion die, the offset section plane following the centre line of an exit aperture connecting the respective groove to the extrusion die;
FIG. 2 is a cross-sectional view, taken in plan, of a portion of the wheel and associated parts, along the plane indicated by the line II--II in FIG. 1 and FIG. 3;
FIG. 3 is a cross-sectional side elevation of parts associated with the extrusion die;
FIG. 4 is a plan view of a die top portion; and
FIG. 5 is a view of the die top portion taken from below.
As shown in FIG. 1 the continuous extrusion apparatus includes a circumferentially grooved wheel 2 mounted on a horizontal drive shaft 4 running on bearings (not shown) positioned on a bed (not shown). Arcuate tooling 6 is positioned in a shoe 8 mounted on a pivot 10 extending parallel to the horizontal drive shaft 4 and urged against a stop 12 positioned adjacent the wheel 2 and above the drive shaft 4 by means of a main hydraulic ram 14 bearing against a shoulder 16 formed on the shoe. A support ram 18 is provided to pivot the shoe 8 into, or out of, registration with the wheel 2. The tooling 6 includes a shoe insert 20, a die top 22 and abutments 24 positioned in the shoe 8 to register with the wheel. The wheel 2 is formed with circumferential twin grooves 26 and the shoe insert 20 serves, when the shoe is in position adjacent the stop 12, to form a closure to the adjacent portion of the circumferential grooves 26 in the wheel as the wheel rotates past the shoe insert. The die top 22 forms a continua
REFERENCES:
patent: 4362485 (1982-12-01), Slater et al.
patent: 4564347 (1986-01-01), Vaughan
BWE Limited
Hail III Joseph J.
Tolan Ed
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