Aluminum continuous casting nozzle is suitable for use in the continuous casting of metals such as aluminum alloy. More specifically, it is used as a member which supplies molten alloy liquid to a movable mold from a tundish in a continuous casting system. By performing continuous casting using casting tip and nozzle, practically infinitely long cast alloy can be obtained. Particularly, using the casting nozzle makes it possible to effectively prevent the molten liquid leakage, and to obtain a cast alloy that is superior in terms of surface quality.
An example of the composition of a continuous casting system comprises a melting furnace for dissolving metal into molten alloy liquid, a tundish for temporarily storing the molten alloy liquid supplied from the melting furnace, a transfer launder arranged between the melting furnace and the tundish, and a movable mold for casting the molten alloy liquid supplied from the tundish.
The caster nozzle can be arranged in a manner in which one end thereof is fixed to the tundish, with the other end (tip) being disposed of in contact with the movable mold. Besides, in order to more effectively prevent molten alloy liquid from leaking out from an interstice between the tip of the outer peripheral edge of the nozzle and the movable mold, a nozzle cavity may be provided at the vicinity of the tip and nozzle.
In these movable molds using a roll and a belt, a smooth and flat condition of the surface of a cast alloy can be easily maintained because the temperature of the mold can easily be maintained constant and because the surface which touches molten alloy liquid appears continuously.
Caster nozzle for aluminum casting is possible to obtain a cast alloy that is superior in terms of surface quality, particularly because the nozzle tip has superior thermal conductivity, which results in a decrease of deviation in the temperature of molten alloy liquid in a cross-sectional width direction, thereby enabling uniform solidification.
Likewise, when aluminum continuous casting is performed using a casting nozzle, because the nozzle tip has high strength and superior elastic deformability, the nozzle tip can be arranged so as to touch with a movable mold prior to casting, whereby the interstice between the tip of the outer peripheral edge of the nozzle and the movable mold can be decreased. Thus, even if the movable mold moves during casting, the interstice between the tip nozzle and the movable mold can be maintained small. Therefore, it is possible to prevent the occurrence of molten liquid leakage and to make the casting speed comparatively slow so as to prevent an easy occurrence of longitudinal crack.
Accordingly, a cast alloy having superior surface quality can be obtained by using an aluminum continuous casting nozzle in continuous casting.