Metal founding – Means to shape metallic material – Pressure shaping means
Patent
1991-09-10
1993-10-26
Rosenbaum, Mark
Metal founding
Means to shape metallic material
Pressure shaping means
164137, 164271, 164339, 249 80, 249161, B22D 1804
Patent
active
052557324
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a lower structure of a mould for the pressure casting of flat products of great thickness, such as slabs, and a method for mounting and removing the lower spacer of this mould.
A casting method which consists 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 made from 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 connection 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 in 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, compressed 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 full.
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 may 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 parallel-epipedal 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.
A first spacer, or lower spacer, is fixed to the upper part of the support and tilting frame, partically over the entire length of this frame corresponding to the maximum length of the slab which can be cast in the mould.
In the known technique, the lower spacer is fixed directly to the frame of the mould by a series of fixing pieces, called clips, which are screwed onto the frame in lateral positions relative to the lower spacer and on each side of this spacer, each clip comprises an inner edge which bears on a corresponding lateral edge of the lower spacer. This mounting of the spacer on the frame permits certain longitudinal displacements of the spacer, through the action of thermal expansion, so that distortions or deformations of the lower spacer are avoided when the molten metal comes into contact with this spacer.
However, the thermal cycles to which the spacer is subjected during successive casts lead to deformations and to distortions such that the removal of the fixing clips becomes lengthy and difficult for the lower spacers after a certain time of use.
Changing the lower spacer, for example, in order to change the thickness of the mould thus requires a relati
REFERENCES:
patent: 3340926 (1967-09-01), Sylvester
patent: 3434528 (1969-03-01), McGeeney
patent: 3590904 (1971-07-01), Woodburn
patent: 3646991 (1972-03-01), Jeffreys
patent: 3701377 (1972-10-01), Fisher
patent: 3888453 (1975-06-01), Jeffreys
patent: 5143144 (1992-09-01), Laloi
patent: 5143145 (1992-09-01), Vatant
Bertin Luc H.
Courbier Michel F.
Vatant Robert A.
Clecim
Creusot-Loire Industrie
Pelto Rex E.
Rosenbaum Mark
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