Metal founding – Means to shape metallic material – Pressure shaping means
Patent
1991-09-10
1992-09-01
Batten, Jr., J. Reed
Metal founding
Means to shape metallic material
Pressure shaping means
164339, 164342, 164348, 249 80, 249134, 249161, B22D 1804
Patent
active
051431440
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a rear spacer of a mould for pressure casting flat metal products of great thickness, such as slabs.
A casting method which consist in introducing a ladle containing the metal to be cast inside a vessel which is then closed by a cover applied in a leaktight manner to the upper edge of the vessel has been known and used for a long time. The cover of the vessel carries a tube in refractory material the lower part of which is immersed in the metal filling the ladle and the upper part of which communicates with an opening which passes through the cover of the vessel equipped with means for connecting to a spout for casting the metal in the mould.
The assembly consisting of the vessel containing the ladle and equipped with its closing cover can be brought into a casting position beneath a mould comprising a filling spout at its lower part. The spout for filling the mould is caused to coincide and to come into leaktight contact with the device for connecting the cover of the ladle, then compresses air is conveyed inside the vessel so as to cause the metal to rise inside the refractory tube, then inside the mould, until the latter is completely filled.
By regulating the pressure of the gas conveyed in the ladle, the conditions for casting the metal and filling the mould are perfectly controlled, which makes it possible to obtain castings of a very satisfactory and uniform quality.
This pressure-casting method can be applied to the production of flat steel products of great thickness, such as slabs.
The moulds used for the pressure casting of slabs comprise a support and tilting frame mounted so as to pivot about a horizontal axis so that it may be inclined very slightly, relative to the horizontal plane, in order to connect the spout for filling the mould to the exit opening of the cover of the vessel before commencing the casting operation.
The mould principally comprises two lateral walls of large dimensions disposed parallel and opposite one another, the inner faces which are lined with graphite blocks of which form the surfaces of the mould which come into contact with the molten metal in order to delimit the two large faces of the slab.
The lateral walls are mounted on the frame so as to be movable in the direction perpendicular to their moulding faces, that is to say in the transverse direction of the mould corresponding to the thickness of the moulded product. The closing of the other faces of the cavity of the mould, of substantially parallelepipedal form, is provided by spacers inserted between the two lateral walls which are clamped against these spacers during casting and cooling of the metal introduced into the mould.
The width of the spacers in the transverse direction determines the thickness of the flat product being cast.
One of these spacers, called the rear spacer, closed the casting cavity of parallelepipedal form according to a direction corresponding to the width of the slab, on the side of the mould opposite to its front end via which the molten metal penetrates into the casting cavity. This spacer is disposed in a substantially vertical direction and can be displaced in the longitudinal direction of the mould corresponding to the longitudinal direction of the slab by a device carried by the rear part of the support and tilting frame. This rear spacer makes it possible to regulate the length of the casting cavity and thus the length of the slab being moulded.
During casting, the molten metal which is introduced into the casting cavity via the lower end of tis front part comes into contact, firstly, with the lower spacer and then reached the rear spacer whose lower end is at a slightly higher level than the level at which the molten metal is introduced, the frame being slightly titled forwards in the casting position. The molten metal then rises progressively inside the casting cavity, the rear spacer being in contact with a layer of molten metal whose height progressively increased.
The part of the rear spacer forming the moulding wall of the face of the rear end of
REFERENCES:
patent: 3434528 (1969-03-01), McGeeney
patent: 3590904 (1971-07-01), Woodburn, Jr.
patent: 3604497 (1971-09-01), Sylvester
patent: 4669524 (1987-06-01), Nelson
patent: 4733714 (1988-03-01), Smith
Abstract of Japanese Patent Publication 61-182865 Published Aug. 15, 1986.
Abstract of Japanese Patent Publication 62-173063 Published Jul. 29, 1987.
Courbier Michel F.
Laloi Maurice R.
Vatant Robert R.
Batten, Jr. J. Reed
Clecim
Creusot-Loire Industrie
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