Up-drawing continuous casting method, up-drawing continuous casting apparatus, and continuous casting

Abstract

An up-drawing continuous casting method according to the present invention is an up-drawing continuous casting method for forming a casting having a predetermined shape by drawing up molten metal held in a holding furnace, and includes: a step of introducing, into the molten metal, a hollow member configured to draw up the molten metal; and a step of flowing inert gas into the hollow member so as to pour the inert gas into the molten metal. The casting is formed by drawing up the molten metal with the hollow member after stopping the flowing of the inert gas into the molten metal.

1 : An up-drawing continuous casting method for forming a casting having a predetermined shape by drawing up molten metal held in a holding furnace, the up-drawing continuous casting method comprising:
 introducing a hollow member into the molten metal, the hollow member configured to draw up the molten metal; and   flowing inert gas into the hollow member so as to pour the inert gas into the molten metal.   
     
     
         2 : The up-drawing continuous casting method according to  claim 1 , further comprising:
 forming the casting by drawing up the molten metal with the hollow member after stopping the flowing of the inert gas into the molten metal.   
     
     
         3 : The up-drawing continuous casting method according to  claim 1 , further comprising:
 introducing a plurality of hollow members into the molten metal; and   flowing the inert gas into at least one of the plurality of hollow members so as to pour the inert gas into the molten metal.   
     
     
         4 : The up-drawing continuous casting method according to  claim 1 , wherein:
 a mold release agent is provided in at least part of the hollow member.   
     
     
         5 : The up-drawing continuous casting method according to  claim 4 , further comprising:
 separating the part of the hollow member from the casting formed by the molten metal solidifying, the part of the hollow member being provided with the mold release agent.   
     
     
         6 : The up-drawing continuous casting method according to  claim 1 , further comprising:
 spraying coolant gas on the molten metal drawn up with the hollow member, when the hollow member is drawn up.   
     
     
         7 : The up-drawing continuous casting method according to  claim 1 , wherein:
 the hollow member is immersed in the molten metal,   the molten metal is drawn up with the hollow member at the time of drawing up the hollow member immersed, the molten metal being drawn up with the hollow member due to a surface film of the molten metal, a surface tension of the molten metal, and wettability between the molten metal and the hollow member, and,   the molten metal drawn up is cooled off to form the casting.   
     
     
         8 : An up-drawing continuous casting apparatus for forming a casting having a predetermined shape by drawing up molten metal, the up-drawing continuous casting apparatus comprising:
 a holding furnace configured to hold the molten metal;   a hollow member configured to draw up the molten metal;   a driving portion configured to draw up the hollow member so as to draw up the molten metal with the hollow member; and   a gas supply portion configured to supply inert gas into the hollow member.   
     
     
         9 : The up-drawing continuous casting apparatus according to  claim 8 , wherein:
 the driving portion draws up the molten metal with the hollow member after stopping flowing of the inert gas into the molten metal.   
     
     
         10 : The up-drawing continuous casting apparatus according to  claim 8 , wherein:
 a plurality of hollow members is provided; and   the gas supply portion flows the inert gas into at least one of the plurality of hollow members so as to pour the inert gas into the molten metal.   
     
     
         11 : The up-drawing continuous casting apparatus according to  claim 8 , wherein:
 a mold release agent is provided in at least part of the hollow member.   
     
     
         12 : The up-drawing continuous casting apparatus according to  claim 8 , further comprising:
 a cooling portion configured to spray coolant gas on the molten metal drawn up with the hollow member, when the hollow member is drawn up.   
     
     
         13 : The up-drawing continuous casting apparatus according to  claim 8 , wherein:
 the molten metal is drawn up with the hollow member at the time of drawing up the hollow member immersed, the molten metal being drawn up with the hollow member due to a surface film of the molten metal, a surface tension of the molten metal, and wettability between the molten metal and the hollow member, and   the molten metal drawn up is cooled off to form the casting.   
     
     
         14 : A continuous casting comprising:
 a matrix having a unidirectional solidified structure extended in a longitudinal direction; and   a dualphase extended in the longitudinal direction, wherein:   the dualphase is constituted by a hollow member.   
     
     
         15 : The continuous casting according to  claim 14 , wherein:
 a plurality of hollow members is provided.   
     
     
         16 : The continuous casting according to  claim 14 , wherein:
 the hollow member is immersed into molten metal,   the molten metal is drawn up with the hollow member at the time of drawing up the hollow member immersed, the molten metal being drawn up with the hollow member due to a surface film of the molten metal, a surface tension of the molten metal, and wettability between the molten metal and the hollow member, and   the molten metal drawn up is cooled off to form the continuous casting.