Apparatus for manufacturing magnesium-alloy plate by wheel-band continuous casting, and manufacturing method thereof

Abstract

A magnesium-alloy plate manufactured by completely melting a magnesium-alloy material received in a hermetic type melting furnace; transferring the molten magnesium-alloy into a hermetic type heat insulation furnace through a hermetic type transfer runner; discharging the molten magnesium-alloy received in the heat insulation furnace into a recessed portion of a casting wheel through a casting runner, to which a mixed gas containing SF 6 is injected by ignition-suppression gas injection tubes; and continuously casting the molten magnesium-alloy entered into the recessed portion of the casting wheel into a magnesium-alloy plate using a casting band circulating around the casting wheel while coming into contact with an upper portion of the recessed portion.

1 . An apparatus for manufacturing a magnesium-alloy plate by wheel-band continuous casting comprising: 
 a hermetic type melting furnace for heating and melting magnesium-alloy received therein;    a hermetic type heat insulation furnace;    a hermetic type transfer runner extending from a lower portion of the melting furnace to an upper portion of the heat insulation furnace;    a casting runner installed at a lower portion of the heat insulation furnace so as to discharge molten magnesium-alloy;    ignition-suppression gas injection tubes installed above the casting runner;    a casting wheel formed at its surface with a recessed portion to continuously cast the molten magnesium-alloy supplied from the casting runner;    a casting band circulating around the casting wheel while coming into contact with an upper portion of the recessed portion formed at the casting wheel;    a lower guide roll installed just below the casting wheel to come into contact with the casting wheel while interposing the casting band therebetween;    a band tension roll for adjusting a tension of the casting band while guiding the casting band; and    a band press roll installed just above the casting wheel so as to adjust a press force of the casting band.    
     
     
         2 . The apparatus as set forth in  claim 1 , wherein the casting wheel comprises a cooling jacket of a water-cooled type, which is installed inside the casting wheel for enabling self-cooling of the casting wheel.  
     
     
         3 . The apparatus as set forth in  claim 1 , wherein the casting band is cooled by a plurality of gas injectors installed to cool a portion thereof coming into contact with the casting wheel.  
     
     
         4 . A method for manufacturing a magnesium-alloy plate by wheel-band continuous casting comprising the steps of: 
 a) completely melting a magnesium-alloy material received in a hermetic type melting furnace;    b) transferring the molten magnesium-alloy into a hermetic type heat insulation furnace through a hermetic type transfer runner;    c) discharging the molten magnesium-alloy received in the heat insulation furnace into a recessed portion of a casting wheel through a casting runner, to which a mixed gas containing SF 6  is injected by ignition-suppression gas injection tubes;    d) continuously casting the molten magnesium-alloy entered into the recessed portion of the casting wheel into a magnesium-alloy plate using a casting band circulating around the casting wheel while coming into contact with an upper portion of the recessed portion; and    e) discharging the continuously cast magnesium-alloy plate from a lower side of the casting wheel coming into contact with a lower guide roll installed just therebelow while interposing the casting band therebetween.    
     
     
         5 . The method as set forth in  claim 4 , wherein the mixed gas containing SF 6 , injected through the ignition-suppression gas injection tubes, consists of CO 2 , air and maximally 1 percent of SF 6 .  
     
     
         6 . The method as set forth in  claim 4 , wherein the step d) is carried out at a casting velocity from 2 m/min to 25 m/min.  
     
     
         7 . The method as set forth in  claim 4 , wherein the step d) further includes the step d-1) of cooling the casting band using inert gas injected from a plurality of gas injectors installed above the casting wheel.