Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1996-01-16
1997-11-25
Lin, Kuang Y.
Metal founding
Process
Shaping liquid metal against a forming surface
164323, 164337, B22D 3504
Patent
active
056901607
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a sand mould and a method of filling the same. The invention is particularly but not exclusively concerned with the casting of light metal alloys, e.g. of aluminium or magnesium, as described in our PCT Application No. GB 92/02268 (hereinafter referred to as the PCT Application) the contents of which are incorporated herein by reference.
2. Description of Prior Art
According to one aspect of the invention of the PCT Application there is provided a sealing device for an inlet of a sand mould, comprising a filling opening and a chill plate having a sealing face for sliding contact with an inlet side of the mould between a filling position in which the filling opening registers with the mould inlet and a sealing position in which the inlet is closed by the sealing face for a period of time sufficient to permit solidification of the metal in the inlet. According to another aspect of the invention of the PCT Application there is provided casting apparatus comprising means for making a sand mould with a vertical parting line and filling means for filling the mould with molten metal, wherein the filling means is adapted to bottom-fill the mould in a manner permitting control of flow velocity and pressure. Although the sealing device of the PCT Application is primarily intended for use in such casting apparatus for casting light metal alloys, e.g. of aluminium or magnesium, the sealing device may have wider application, e.g. in relation to other low pressure sand casting processes (e.g. the Cosworth process described in the PCT Application).
SUMMARY OF THE INVENTION
The present invention is concerned with an improvement in or modification of the sealing device of the PCT Application. The prior sealing device has a chill plate with a cutting or forming leading edge for making a smooth contact face in the inlet side of the mould during the sliding movement. In the present invention the sealing face of the chill plate still makes sliding contact with the inlet side of the mould but the inlet side of the mould is defined by a solid insert of a suitable thermal material defining the filling inlet of the mould and providing a flat outer face for heat exchanging sliding contact with the sealing face of the chill plate.
In accordance with the present invention, there is provided a method of sealing a sand mould having a filling inlet, comprising making the mould with a (preferably solid) insert of thermally suitable material defining said inlet and providing a flat outer face for sealing and subsequently heat exchanging sliding contact with a sealing face of a chill plate, filling the mould through said insert, and closing the mould by means of said chill plate.
Preferably, a succession of said moulds is produced by forming identical half-moulds each having a front face defining the rear part of the mould cavity of one mould and a rear face defining the front part of the mould cavity of the next following mould, the inserts of adjacent moulds being arranged in line in a common plane.
According to a further aspect of the present invention there is provided a sand mould having a filling inlet defined by a (preferably solid) insert of thermally suitable material providing a flat outer face for sealing and subsequently heat exchanging sliding contact with a sealing face of a chill plate.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be further described by way of example only with reference to the accompanying drawings, in which:
FIG. 1 is a diagrammatic perspective view of a line of sand moulds in section on the parting line of the foremost mould;
FIG. 2 shows the assembled moulds;
FIG. 3 is a plan view showing a mould in a filling position, and
FIG. 4 is a corresponding view showing the same mould in the sealing position.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A pack or line of green sand moulds is made by the casting apparatus described in the PCT Application for the casting of light alloy metal products. Mould halves are
REFERENCES:
patent: 3905419 (1975-09-01), Tenner
patent: 4733714 (1988-03-01), Smith
Campbell John
Flynn Michael Joseph
McBain Gary
Sutton Thomas Leonard
Alloy Technologies Limited
Lin Kuang Y.
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