Metal deforming – By extruding through orifice – By rotating impeller means
Patent
1996-11-18
1998-11-17
Hail, III, Joseph J.
Metal deforming
By extruding through orifice
By rotating impeller means
723423, B21C 2300
Patent
active
058361910
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 and an abutment face displaced in the direction of rotation from the exit aperture.
According to the present invention the arcuate tooling includes a die top formed with the exit aperture and a wedge-shaped recess accommodating an abutment body, the abutment body having a face provided with a spine flanked by shoulders arranged to co-act with a cylindrical surface of the wheel flanking the circumferential groove, a face remote from the abutment face arranged to co-act with a complementary face of the wedge-shaped recess and, with the abutment body in register with the wheel, lying on a plane parallel to and displaced from an axial plane containing the wheel axis such that a component of forces arising upon the abutment face serving to displace feed material from the circumferential groove to the exit aperture upon rotation of the wheel acts in a direction urging the abutment body into the wedge-shaped recess.
Preferably, a portion of the abutment face lies in a plane inclined slightly from an axial plane.
Desirably, the spine on the abutment body is of linear form.
Advantageously, where the wheel is formed with a plurality of circumferential grooves, the abutment body is formed with a corresponding plurality of spines providing a plurality of abutment faces separated and flanked by shoulders arranged, adjacent the abutment faces, to co-act with the cylindrical surface of the wheel.
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 a continuous extrusion apparatus, taken on a central plane;
FIG. 2 is a portion of FIG. 1 to an enlarged scale;
FIG. 3 is an end elevation of a die top included in the apparatus and taken in the direction III--III indicated in FIG. 2;
FIG. 4 is a scrap cross-section taken on the line IV--IV indicated in FIG. 2; and
FIG. 5 is a scrap cross-section taken on the line V--V indicated in FIG. 2.
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 an abutment body 24 positioned in the shoe 8 to register with the wheel. 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 groove 26 in the wheel as the wheel rotates past the shoe insert. The die top 22 forms a continuation of the shoe insert 20 and also forms a closure to the adjacent rotated portion of the circumferential groove. The abutment body 24 extends into the circumferential groove 26 to form an obturation of the groove and cause displacement of feed material in the groove 26 through an exit aperture 28 and effect extrusion.
As shown to an enlarged scale in FIGS. 2, 3, 4 and 5, the abutment body 24 is positioned in a corresponding recess 30 in the die top 22 and is of a generally wedge-shaped form having a rectangular cross-section in a plane parallel to a plane axial of the wheel. Thus, the abutment body 24 has faces 34, 36 seating against faces 38,
REFERENCES:
patent: 4505878 (1985-03-01), Childs et al.
patent: 4732551 (1988-03-01), East et al.
BWE Limited
Hail III Joseph J.
Tolan Ed
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