Metal deforming – By extruding through orifice – By rotating impeller means
Patent
1991-01-28
1992-10-06
Larson, Lowell A.
Metal deforming
By extruding through orifice
By rotating impeller means
72269, B21C 2308
Patent
active
051521636
DESCRIPTION:
BRIEF SUMMARY
This invention relates to apparatus for the forming of metals by a continuous extrusion process in which feed stock 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. The tooling includes an aperture formed in a shoe portion and extending in a generally radial direction from the groove to a die and an abutment is provided to constrain the feedstock to flow through the aperture and the die.
In EP-A-0125788 there is described continuous extrusion apparatus having a plurality of spaced apart circumferential grooves, arcuate tooling with a shoe portion bounding radially outer portions of the respective grooves provided with exit apertures extending in a generally radial direction from the respective grooves to a chamber and abutments displaced in the direction of rotation from the apertures extending into the grooves, the chamber extending around an extrusion mandrel and discharging axially of the extrusion mandrel through a die orifice intermediate the extrusion mandrel and an extrusion die body wall.
In a continuous extrusion apparatus of the form set out, according to the present invention, the exit apertures are formed with frusto-conical walls smoothly diverging radially outwardly from the face of the shoe portion bounding the grooves to merge smoothly with the chamber.
The invention will now be described, by way of example, with reference to the accompanying, partly diagrammatic, drawings, in which:
FIG. 1 is a radial cross-section of a portion of a twin grooved rotating wheel and a portion of a shoe showing a die chamber and extrusion mandrel;
FIG. 2 is end view of a mixer plate positioned in the die chamber;
FIG. 3 is a cross-section of the mixer plate taken on the line III--III of FIG. 2;
FIG. 4 is a modified form of the arrangement shown in FIG. 1;
FIG. 5 is a radial cross-section of a portion of a twin grooved rotating wheel and a portion of a shoe showing an alternative form of a die chamber and extrusion mandrel;
FIG. 6 is end view of a mixer plate positioned in the die chamber shown in FIG. 5;
FIG. 7 is a cross-section of the mixer plate taken on the line VII--VII of FIG. 6;
FIG. 8 is a cross-section of extrudate produced in the alternative arrangement shown in FIGS. 5 to 7;
FIG. 9 is a radial cross-section of a portion of a twin grooved rotating wheel and a portion of a shoe showing a further alternative form of a die chamber and extrusion mandrel.
FIG. 10 is a radial cross-section of a portion of a twin grooved rotating wheel and a portion of a shoe showing a yet further alternative form of a die chamber and extrusion mandrel.
FIG. 11 is a cross-section taken on the line XI--XI of FIG. 10; and
FIG. 12 is a cross-section of extrudate produced in the yet alternative arrangement shown in FIGS. 10 and 11.
Referring to FIGS. 1 to 3, in which there is shown an arrangement adapted to produce a large diameter aluminium tube as extrudate, a wheel 2 of a continuous extrusion machine is formed with a pair of axially spaced circumferential grooves 4. A die chamber 6 is formed in a shoe portion 8 of the machine adjacent abutments (not shown) extending into the grooves, and is formed with a pair of divergent, frustoconical, apertures 10 in register with the grooves 4. Positioned in the die chamber 6 is an extrusion mandrel 12, a mixer plate 14, a locating ring 16, an extrusion die 18 and a die support 20. A bolt 22 secures the extrusion mandrel 12 in the die chamber with circumferentially divergent slots 24 in the extrusion mandrel 12 registering with the apertures 10 in the shoe portion 8. As shown in FIGS. 2 and 3, as well as in FIG. 1, the mixer plate 14 is profiled to distribute the flow evenly around the mandrel. Arised protrusions 26 circumferentially divide the flow from the adjacent aperture 10, whilst scalloped portions 28 facilitate the confluence of the adjoining divided flows adjacent an annular gap 30 intermediate the extrusion mandrel 12 and the extrusion die 18.
The bolt 22 is formed
REFERENCES:
patent: 641041 (1900-01-01), Royle
patent: 2135194 (1938-11-01), Underhill
patent: 3240047 (1966-03-01), Long et al.
patent: 3748885 (1973-07-01), Creuzet
patent: 4277968 (1981-07-01), Pardoe
patent: 4564347 (1986-01-01), Vaughan
patent: 4578973 (1986-04-01), Ishimaru et al.
Anderson Douglas E.
Hawkes Daniel J.
Jones Phillip A.
BWE Limited
Larson Lowell A.
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