Metal founding – Means to shape metallic material – Continuous or semicontinuous casting
Patent
1992-09-11
1994-11-29
Batten, Jr., J. Reed
Metal founding
Means to shape metallic material
Continuous or semicontinuous casting
164348, 266241, B22D 1110, B22D 2704, B22D 41005
Patent
active
053680898
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a device for removing heat energy from a mass of molten material, such as molten metal.
A particular, but not sole, application of the invention is to a device for cooling molten metal which is to be cast in a continuous casting mould. If the molten metal is allowed to flow into the continuous casting mould at a temperature above a predetermined level, the mould may not be able to cool the metal sufficiently to enable a skin of adequate thickness to form on the mould walls and for the wall thickness of the skin at the outlet end of the mould to be sufficiently strong to retain the molten core of the casting. Furthermore, the metallurgical structure quality of the solidified metal is often inferior if molten metal at too high a temperature is used. The device of the invention serves to reduce the temperature of the molten metal to the predetermined level if necessary. The device can be used on the molten metal before it enters the continuous casting mould or it can be used with the molten metal in the continuous casting mould.
It is known from French Patent Publication No. 2526340 for one or more water cooled devices to be dipped into the molten metal in a vertical continuous casting mould in order to withdraw heat energy from the molten metal thereby encouraging the molten metal to commence solidification. In the French publication the device comprises a generally vertical elongate body having a rounded lower end and a water passage extending through the body from the upper end to a position adjacent the lower end and back to the upper end. In use, water is caused to continuously flow through the passage to bring about cooling of the body.
In Japanese Publication No. 51-86024 a similar water-cooled device is used in a tundish upstream of a continuous casting mould.
It is also known from Japanese Patent Publication No. 61-132244 for a heat pipe to be dipped into molten metal in a vertical continuous casting mould and the heat pipe is protected by a heat-resistive shield with a low melting point metal between the outer surface of the heat pipe and the shield. In use, the low melting point metal melts to form a liquid heat transfer medium between the heat-resistant shield and the heat pipe. The part of the cooled device which is in contact with the molten metal will extract some heat from the molten metal causing a thin layer of skull to be formed on the surface of the device.
According to the present invention, a device comprises a body of thermally conductive material having a duct therein for the passage of liquid coolant therethrough and means for supporting the body so that, in use, a part of the body is submerged in the molten metal to be cooled, characterised in that the body comprises an upper part and a lower part which, in use, is submerged in the molten metal, said lower part having a dimension in a horizontal cross-sectional plane which is greater than the corresponding dimension in a higher horizontal cross-sectional plane of the lower part whereby, in use, a skull of solidified metal which forms on the submerged part of the body is locked to the body by extending around said greater dimension, and the duct for liquid coolant is entirely within the upper part of the body which is not arranged to be submerged in the molten metal.
By arranging for the liquid coolant to be associated with the part of the body which is above the surface of the molten metal, the danger of the cooling liquid coming into contact with the molten metal in the event of a fracture of the submerged part of the body is considerably reduced since the cooling liquid does not enter the part of the body which is submerged in the molten metal.
By arranging for the part of the body which is submerged in the molten metal to have a greater dimension in a horizontal cross-sectional plane positioned at a level below a horizontal cross-sectional plane of smaller dimension, the skull which forms on the surface of the submerged part of the body locks on to the body around the greater dimension and thus prevents p
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patent: 3658116 (1972-04-01), Hunt
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patent: 4858671 (1989-08-01), Hesterberg et al.
patent: 5005632 (1991-04-01), Henderson et al.
patent: 5040590 (1991-08-01), Brandriff
Perry Robert M.
Preshaw David A.
Reynolds Timothy
Batten, Jr. J. Reed
Davy (Distington) Limited
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