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
051431459
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a mould for pressure casting flat metal products of great thickness and considerable length such as steel slabs intended to be transformed into a sheet by rolling.
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 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 slide spout for casting the metal in a 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 to 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 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, described, for example, in patents U.S. Pat. No. 3,888,453 and U.S. Pat. No. 3,590,904, may be applied not only to the production of shaped pieces, but also to the casting of semi-manufactured products such as slabs, blooms, billets and tube rounds.
In the case of slabs, that is to say of flat steel products of great length and considerable thickness, it being possible for this thickness to be between, for example, 60 and 400 mm or more, use is made of moulds of very large dimensions which make it possible to cast slabs whose length may be of the order of 10 m or more and whose width may reach 3 m or more.
In certain cases, this casting method may advantageously replace the method for continuous casting of slabs, according to the nature of the grades to be cast, the tonnages to be produced and the size of the products both in terms of their thickness and their width.
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, before commencing a casting operation. This pivoting of the frame makes it possible to connect the spout for filling the mould to the exit opening of the cover of the vessel brought into the casting position beneath the mould and makes it possible to control the flow of steel over the lower spacer.
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 between 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, practically over the entire length of this frame corresponding to the maximum length of the slab which can be cast in the mould.
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REFERENCES:
patent: 3434528 (1969-03-01), McGeeney
patent: 3590904 (1971-07-01), Woodburn, Jr.
patent: 3646991 (1972-03-01), Jeffreys
patent: 3701377 (1972-10-01), Fisher
patent: 3888453 (1975-06-01), Jeffreys
patent: 4669524 (1987-06-01), Nelson
Chalencon Jean-Pierre L.
Courbier Michel F.
Vatant Robert A.
Batten, Jr. J. Reed
Clecim
Creusot-Loire Industrie
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