Plastic article or earthenware shaping or treating: apparatus – Means for molding powdered metal – Continuous length product formation
Patent
1985-06-20
1987-03-17
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Means for molding powdered metal
Continuous length product formation
72262, 425224, 425374, 425376A, 425376B, B22F 320, B21C 2308
Patent
active
046504087
DESCRIPTION:
BRIEF SUMMARY
This invention relates to apparatus for the forming of metals by a continuous extrusion process and, more particularly, to 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 a die or an extrusion orifice or extrusion orifices, extending in a generally tangential direction and leading to a die, and an abutment is provided extending into the groove to constrain the feedstock to flow through the die. The arcuate tooling and the abutment have a width substantially equal to the width of the groove.
According to one aspect of the invention there is provided 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 including a die or an extrusion orifice or extrusion orifices, extending in a generally radial direction from the groove and leading to a die, and an abutment extending into and spaced from wall portions of the groove adjacent to and displaced in the direction of rotation from the aperture partially to obturate the groove.
According to another aspect of the invention, there is provided 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 including a die or an extrusion orifice or extrusion orifices, extending in a generally radial direction from the groove and leading to a die, and an abutment extending into the groove adjacent to and displaced in the direction of rotation from the aperture partially to obturate the groove, the groove having side walls formed as annuli co-axial with the rotatable wheel.
According to a further aspect of the invention, the rotatable wheel is formed with a circumferential channel of substantially rectangular axial cross-section having wall portions formed by a cylindrical face bounded by radially outwardly extending flanges, the circumferential groove being formed in the cylindrical face of the circumferential channel and the arcuate tooling being formed with cylindrical and radial faces respectively co-acting with the wall portion of the circumferential channel.
According to a yet further aspect of the invention, there is provided continuous extrusion apparatus having a rotatable wheel formed with a circumferential groove, arcuate tooling bounding a radially outer portion of the groove formed with an extrusion orifice or extrusion orifices extending in a generally radial direction from the groove, an abutment extending into the groove adjacent to and displaced in the direction of rotation from the orifice or orifices partially to obturate the groove, the or each orifice including a passageway diverging away from the groove to an extrusion die.
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 forming apparatus;
FIG. 2 is a partial axial cross-section taken on the line II--II of FIG. 1;
FIG. 3 is a cross-section of a portion of the forming apparatus;
FIG. 4 is a cross-section corresponding to the line IV--IV of FIG. 3;
FIG. 5 is an alternative form of the portion shown in FIG. 3;
FIG. 6 is a further alternative form of the portion shown in FIG. 3; and
FIG. 7 is a yet further alternative form of the portion shown in FIG. 3.
As shown in FIGS. 1 and 2, a circumferentially grooved wheel 2 is 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 provid
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Research Disclosure, No. 203, Mar. 1981, (Havant, Hampshire, GB) Disclosure No. 20342 "Recent Developments in `Conform`--Continuous Extrusion Technology", p. 137, right-hand column, lines 61-65.
Anderson Douglas E.
Mitchell Keith J.
Babcock Wire Equipment Limited
Housel James C.
Kemon Solon B.
Woo Jay H.
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