Cold crucible for thin slab continuous casting of light metal with high-purity

Abstract

The present invention provides a cold crucible for continuously casting high-purity light metal thin slab, which can control the electromagnetic force applied from the inner wall surface of a cold crucible to the surface of molten metal in order to change the shape of the cold crucible to various shapes during electromagnetic casting, while stabilizing the molten metal inside the cold crucible and casting an ingot having uniform particles.

1 . A cold crucible for thin slab continuous casting of light metal with high-purity, wherein an alternating current (AC) electricity is applied to a coil wound around an outer circumferential surface of a cold crucible; an edge of the cold crucible is formed of a plurality of segments in order for a portion of the AC electricity, which is applied, to be applied to the cold crucible; and a plurality of slits are disposed between the plurality of segments, the cold crucible for thin slab continuous casting of light metal with high-purity characterized in that a horizontal, cross-sectional shape of the cold crucible is non-circular, based on a center of the cold crucible, toward which electromagnetic force applied to a surface of molten metal in the cold crucible from an internal wall surface of the cold crucible is directed, the plurality of slits are formed to have a relatively wide interval on a surface of the cold crucible disposed relatively close to the center of the cold crucible, rather than on a surface of the cold crucible disposed relatively distant from the center of the cold crucible; and a ratio (d 2 /d 1 ) of a slit interval d 2  on an internal side of the cold crucible, on a surface of the cold crucible disposed closest to the center of the cold crucible, to a slit interval dl on the internal side of the cold crucible on a surface of the cold crucible disposed farthest from the center of the cold crucible, is 1.5 or more to 2.0 or less. 
     
     
         2 . The cold crucible for thin slab continuous casting of light metal with high-purity of  claim 1 , wherein a width of the plurality of segments is 20 mm or more to 50 mm or less. 
     
     
         3 . The cold crucible for thin slab continuous casting of light metal with high-purity of  claim 1 , wherein a ratio (d 2 /T) of the width d 2  of the segment in the central side portion of the cold crucible to a thickness T of the plurality of segments is less than or equal to 1.8. 
     
     
         4 . The cold crucible for thin slab continuous casting of light metal with high-purity of  claim 1 , wherein the molten metal is formed using a light metal having a specific gravity of less than or equal to 5. 
     
     
         5 . The cold crucible for thin slab continuous casting of light metal with high-purity of  claim 1 , wherein the horizontal, cross-sectional shape of the cold crucible is an ellipse, a rectangle, or a polygon. 
     
     
         6 . The cold crucible for thin slab continuous casting of light metal with high-purity of  claim 1 , wherein the horizontal, cross-sectional shape of the cold crucible maintains a uniform shape from an uppermost portion to a lowermost portion of the cold crucible, thereby minimizing an amount of the molten metal remaining in a molten state in the cold crucible.