Pulling-up-type continuous casting apparatus and pulling-up-type continuous casting method

Abstract

A pulling-up-type continuous casting apparatus according to an aspect of the present invention includes a holding furnace that holds molten metal, a shape defining member disposed near a molten-metal surface of the molten metal held in the holding furnace, the shape defining member being configured to define a cross-sectional shape of a cast-metal article to be cast as the molten metal passes through the shape defining member, a first nozzle that blows a cooling gas on the cast-metal article, the cast-metal article being formed as the molten metal that has passed through the shape defining member solidifies, and a second nozzle that blows a gas toward the cast-metal article in an obliquely upward direction from below a place on the cast-metal article on which the cooling gas is blown from the first nozzle.

1 . A pulling-up-type continuous casting apparatus comprising:
 a holding furnace that holds molten metal;   a shape defining member disposed near a molten-metal surface of the molten metal held in the holding furnace, the shape defining member being configured to define a cross-sectional shape of a cast-metal article to be cast as the molten metal passes through the shape defining member;   a first nozzle that blows a cooling gas on the cast-metal article, the cast-metal article being formed as the molten metal that has passed through the shape defining member solidifies; and   a second nozzle that blows a gas toward the cast-metal article in an obliquely upward direction from below a place on the cast-metal article on which the cooling gas is blown from the first nozzle.   
     
     
         2 . The pulling-up-type continuous casting apparatus according to  claim 1 , wherein the second nozzle is fixed on the shape defining member. 
     
     
         3 . The pulling-up-type continuous casting apparatus according to  claim 1 , wherein the second nozzle is formed inside the shape defining member. 
     
     
         4 . The pulling-up-type continuous casting apparatus according to  claim 3 , further comprising a projection disposed on the shape defining member, the projection being disposed at an end on a side of the shape defining member where the molten metal passes through, the projection extending in a pulling-up direction, wherein
 a tip of the second nozzle is formed on a top surface of the projection.   
     
     
         5 . The pulling-up-type continuous casting apparatus according to  claim 1 , wherein an angle between a surface of the cast-metal article and a flux of the gas blown from the second nozzle is equal to or less than 25 degrees. 
     
     
         6 . The pulling-up-type continuous casting apparatus according to  claim 1 , wherein the gas blown from the second nozzle is the same gas as the cooling gas blown from the first nozzle. 
     
     
         7 . A pulling-up-type continuous casting apparatus comprising:
 a holding furnace that holds molten metal;   a shape defining member disposed near a molten-metal surface of the molten metal held in the holding furnace, the shape defining member being configured to define a cross-sectional shape of a cast-metal article to be cast as the molten metal passes through the shape defining member;   a nozzle that blows a cooling gas on the cast-metal article, the cast-metal article being formed as the molten metal that has passed through the shape defining member solidifies; and   a projection disposed on the shape defining member, the projection being disposed at an end on a side of the shape defining member where the molten metal passes through, the projection extending in a pulling-up direction.   
     
     
         8 . A pulling-up-type continuous casting method comprising:
 a step of pulling up molten metal held in a holding furnace while making the molten metal pass through a shape defining member, the shape defining member being configured to define a cross-sectional shape of a cast-metal article to be cast; and   a step of blowing a cooling gas on the cast-metal article, the cast-metal article being formed from the molten metal that has passed through the shape defining member, wherein   in the step of blowing the cooling gas, a gas is blown toward the cast-metal article in an obliquely upward direction from below a place on the cast-metal article on which the cooling gas is blown.   
     
     
         9 . The pulling-up-type continuous casting method according to  claim 8 , further comprising a step of adjusting a flow rate of the gas according to a flow rate of the cooling gas. 
     
     
         10 . The pulling-up-type continuous casting method according to  claim 8 , wherein the nozzle for blowing the gas toward the cast-metal article in the obliquely upward direction is fixed on the shape defining member. 
     
     
         11 . The pulling-up-type continuous casting method according to  claim 8 , wherein the nozzle for blowing the gas toward the cast-metal article in the obliquely upward direction is formed inside the shape defining member. 
     
     
         12 . The pulling-up-type continuous casting method according to  claim 11 , wherein
 a projection is provided on the shape defining member, the projection being disposed at an end on a side of the shape defining member where the molten metal passes through, the projection extending in a pulling-up direction, and   a tip of the nozzle is formed on a top surface of the projection.   
     
     
         13 . The pulling-up-type continuous casting method according to  claim 8 , wherein an angle between a surface of the cast-metal article and a flux of the gas blown toward the cast-metal article in the obliquely upward direction is equal to or less than 25 degrees. 
     
     
         14 . The pulling-up-type continuous casting method according to  claim 8 , wherein the gas blown toward the cast-metal article in the obliquely upward direction is the same gas as the cooling gas. 
     
     
         15 . A pulling-up-type continuous casting method comprising:
 a step of pulling up molten metal held in a holding furnace while making the molten metal pass through a shape defining member, the shape defining member being configured to define a cross-sectional shape of a cast-metal article to be cast; and   a step of blowing a cooling gas on the cast-metal article, the cast-metal article being formed from the molten metal that has passed through the shape defining member, wherein   a projection is provided on the shape defining member, the projection being disposed at an end on a side of the shape defining member where the molten metal passes through, the projection extending in a pulling-up direction.