Metal deforming – By extruding through orifice – By rotating impeller means
Patent
1991-03-11
1992-10-27
Larson, Lowell A.
Metal deforming
By extruding through orifice
By rotating impeller means
B21C 2904
Patent
active
051579553
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
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 GB-A-0125788 there is described continuous extrusion apparatus including a rotatable wheel having a plurality of spaced apart circumferential grooves, and provided with arcuate tooling with a shoe portion bounding radially outer portions of the respective grooves formed with exit apertures extending in a generally radial direction from the respective grooves to a chamber and abutments displaced in the direction of rotation of the wheel from the apertures extending into the grooves, the chamber discharging to a die orifice.
In a continuous extrusion apparatus of the form set out, according to one aspect of the invention the tooling includes an entry block positioned in a recess in the shoe portion bounding the grooves together with an abutment block, an expansion block, a die block and an exit block, the abutment block, expansion block and exit block being serially positioned in a stepped bore in the shoe portion with the abutment block seating upon a shoulder in the bore adjacent the entry block and means being provided to secure the exit block axially of the bore.
Preferably, the abutment block extends through an aperture in the entry block of generally frusto-conical form and flat faces formed on abutting, otherwise frusto-conical, faces co-act angularly to locate the abutment block relative to the entry block.
Desirably, a divergent expansion chamber extending through the expansion block includes an initial section and an outlet section each of frusto-conical form with the outlet section having a greater cone angle than the cone angle of the initial section.
Suitably, the means securing the exit block axially of the bore include locking keys moveable between an engaged position effecting secural and a disengaged position allowing removal of the exit block. Additionally, a retaining ring may be threaded into an end of the bore remote from the wheel to bear against the locking keys in an engaged position.
In another embodiment of the invention, the abutment block, the expansion block, the die block and the exit block are disconnectably secured together to form a tooling cartridge removable from and insertable into the bore as a whole and a heating chamber is provided adapted to effect heating of the tooling cartridge prior to insertion into the bore.
Advantageously, the tooling cartridge is insertable into and removable from the bore by actuation of a reciprocable ram aligned with the bore.
In a further embodiment of the invention, a continuous casting furnace is arranged to discharge cast feedstock direct to the circumferential grooves.
Suitably, the cast feedstock is discharged through a tunnel from the continuous casting furnace to the circumferential grooves. The tunnel may be lined with heat insulating material and may be arranged to be supplied with gases having little or no oxygen content.
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, indicating a shoe and associated tooling in a position dis-engaged from a rotatable, grooved, wheel, the engaged position being indicated in chain dotted outline, together with an associated heating chamber and a portion of a ram;
FIG. 2 is a plan view taken in the direction of the arrow II on FIG. 1:
FIG. 3 is a cross-section taken on the line III--III of FIG. 1; and
FIG. 4 is a cross-section taken on the line IV--IV of FIG. 1.
As shown in the accompanying drawings, a wheel 2 of a continuous e
REFERENCES:
patent: 3457760 (1969-07-01), Cassady et al.
patent: 4598567 (1986-07-01), Backus
patent: 4823586 (1989-04-01), Sinha et al.
Anderson Douglas E.
Hawkes Daniel J.
Jones Phillip A.
BWE Limited
Larson Lowell A.
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