Rotary continuous casting device

Details Rotary continuous casting device Rotary continuous casting device

1998-11-10

2000-05-02

Batten, Jr., J. Reed

Metal founding

Means to shape metallic material

Continuous or semicontinuous casting

164429, 164443, 492 6, 492 16, 492 46, B22D 1106

Patent

active

060560398

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a rotary device for continuous casting of liquid metal, usable specifically for continuous production of thin slabs or ferrous or non-ferrous metal strips.
Continuous casting of steel or other metal is performed, in a conventional way, in a mould whose walls are cooled strongly, at the contact of which the cast metal solidifies in surface in order to constitute a product limited by a hardened crust surrounding a liquid or pasty core and, with a cross section identical to that of the mould. This product is removed from the mould at a certain speed and is then picked up by guiding devices fitted with cooling means up to complete solidification. One can thus make products of various sections, such as bars or slabs, with a width much greater than their thickness.
Conventional continuous casting installations using, particularly, an oscillating ingot mould, are designed for producing slabs whose thickness does not normally fall below 80 to 100 mm. It is thus normally necessary to use special machines for the production of thin slabs, less than 80 mm in thickness.
It is an objective since some years to make, according to a continuous process, products still thinner, constituting simple strips whose thickness can be as small as 1 mm approximately, in certain cases.
For this purpose, one can advantageously use rotary machines comprising at least one drum brought into rotation around its axis and limited by a cooled cylindrical wall along which the cast metal solidifies to form a strip which is then separated from the drum (EP-A-237 008).
However such arrangement is used only for the casting of amorphous metals or metals with a relatively low melting temperature. In another known arrangement two cylinders with horizontal axes, located opposite to one another in order to provide a gap to the width one wishes to give to the strip are used. The metal is cast in the space comprised between both cylinders and which has more or less a V-shaped cross section, which is reduced gradually to an outlet gap whose width corresponds to the distance between both cylinders, whereby the casting space is limited, axially, by end plates applied more or less tightly on both cylinders.
Each cylinder is cooled strongly by water circulation and the cast metal solidifies along the circumference of both cylinders which are brought into rotation in the reverse direction, in order to form a product which has solidified at least superficially and which is ejected towards secondary guiding and cooling means placed below both cylinders and in which the solidification and cooling phases are completed.
In a known arrangement disclosed for example in DE-A-3 801 085, the cylindrical wall on which the metal is provided is a drum supported by two bearings defining a rotation axis of the drum and inside which is placed a fixed core limited by a circular surface separated from the inner surface of the drum by an annular gap in which the cooling fluid circulates. For this purpose, the fixed core is provided with two chambers respectively a feeding chamber and an exhaust chamber leading to each side to a sealing gasket which extends along a generatrix between the rotary wall and the fixed core. The cooling fluid introduced by the feeding chamber penetrates into the annular gap and rotates around the core until the sealing gasket and is exhausted by the exhaust chamber.
To allow distribution of the fluid on the whole drum surface, circulation grooves are provided onto the inner surface of the cylindrical wall which thus must be thick.
Moreover, the drum assembly must be relatively rigid to provide centering of the cylindrical wall onto the rotation axis around the fixed core.
However, the outer surface of the cylindrical wall on which is cast the liquid metal is at a temperature well above that of the inner surface along which circulates the cooling fluid. There is thus relatively important thermal deformation effects bought about by differential expansions. Practically, the outer surface of the wall shows a tendency to vaulting

REFERENCES:
patent: 4864703 (1989-09-01), Biondetti et al.
patent: 5010633 (1991-04-01), Brown et al.
patent: 5140731 (1992-08-01), Brendel
patent: 5383833 (1995-01-01), Brugger et al.
Morel, M. et al: "Shaperoll Actuator-Results of Hot and Cold Mill Applications", Iron and Steel Engineer, vol. 69, No. 4, Apr. 1, 1992, pp. 74-77.

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