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

Abstract

A pulling-up-type continuous casting apparatus according to the present invention includes a molten-metal holding furnace ( 101 ) that holds molten metal (M 1 ), a starter (ST) that draws the molten metal (M 1 ) held in the molten-metal holding furnace ( 101 ) from a molten-metal surface of the molten metal (M 1 ), and a shape defining member ( 102 ) that defines a cross-sectional shape of a cast-metal article (M 3 ) to be cast by applying an external force to the held molten metal (M 2 ) drawn by the starter (ST), in which the starter (ST) includes a body part ( 107 ) and a tip part ( 108 ), the tip part ( 108 ) including a tip ( 109 ) having a horizontal cross section smaller than that of the body part ( 107 ).

1 . A pulling-up-type continuous casting apparatus comprising:
 a holding furnace that holds molten metal;   a drawing member that draws the molten metal held in the holding furnace from a molten-metal surface of the molten metal; and   a shape defining member that defines a cross-sectional shape of a cast-metal article to be cast by applying an external force to the molten metal drawn by the drawing member, wherein   the drawing member comprises a body part and a tip part, the tip part comprising a tip having a horizontal cross section smaller than that of the body part.   
     
     
         2 . The pulling-up-type continuous casting apparatus according to  claim 1 , wherein the tip part has a tapered shape such that the tip part becomes narrower toward its tip. 
     
     
         3 . The pulling-up-type continuous casting apparatus according to  claim 2 , wherein the angle of the tip is 45 degrees or smaller. 
     
     
         4 . The pulling-up-type continuous casting apparatus according to  claim 1 , wherein the tip part comprises a plurality of tips. 
     
     
         5 . The pulling-up-type continuous casting apparatus according to  claim 1 , wherein the drawing member further comprises at least one of a first protrusion part protruding from a side of the tip part or the body part and a first recessed part recessed from the side of the tip part or the body part. 
     
     
         6 . The pulling-up-type continuous casting apparatus according to  claim 5 , wherein the protrusion length of the first protrusion part or the recess depth of the first recessed part is 1 mm or larger. 
     
     
         7 . The pulling-up-type continuous casting apparatus according to  claim 5 , wherein the drawing member comprises a plurality of first protrusion parts or a plurality of first recessed parts. 
     
     
         8 . The pulling-up-type continuous casting apparatus according to  claim 1 , wherein the tip part further comprises:
 an opening opened from the tip; and   at least one of a second protrusion part protruding from a side of the opening and a second recessed part recessed from the side of the opening.   
     
     
         9 . The pulling-up-type continuous casting apparatus according to  claim 8 , wherein the protrusion length of the second protrusion part or the recess depth of the second recessed part is 1 mm or larger. 
     
     
         10 . The pulling-up-type continuous casting apparatus according to  claim 8 , wherein the tip part comprises a plurality of second protrusion parts or a plurality of second recessed parts. 
     
     
         11 . A pulling-up-type continuous casting apparatus comprising:
 a holding furnace that holds molten metal;   a drawing member that draws the molten metal held in the holding furnace from a molten-metal surface of the molten metal; and   a shape defining member that defines a cross-sectional shape of a cast-metal article to be cast by applying an external force to the molten metal drawn by the drawing member, wherein   the drawing member comprises a body part, and at least one of a first protrusion part protruding from a side of the body part and a first recessed part recessed from the side of the body part.   
     
     
         12 . The pulling-up-type continuous casting apparatus according to  claim 11 , wherein the protrusion length of the first protrusion part or the recess depth of the first recessed part is 1 mm or larger. 
     
     
         13 . The pulling-up-type continuous casting apparatus according to  claim 11 , wherein the drawing member comprises a plurality of first protrusion parts or a plurality of first recessed parts. 
     
     
         14 . The pulling-up-type continuous casting apparatus according to  claim 11 , wherein the body part further comprises:
 an opening opened from the tip; and   at least one of a second protrusion part protruding from a side of the opening and a second recessed part recessed from the side of the opening.   
     
     
         15 . The pulling-up-type continuous casting apparatus according to  claim 14 , wherein the protrusion length of the second protrusion part or the recess depth of the second recessed part is 1 mm or larger. 
     
     
         16 . The pulling-up-type continuous casting apparatus according to  claim 14 , wherein the body part comprises a plurality of second protrusion parts or a plurality of second recessed parts. 
     
     
         17 . A pulling-up-type continuous casting method comprising:
 a step of submerging a drawing member into a molten-metal surface of molten metal held in a holding furnace; and   a step of drawing the molten metal by the drawing member and making the drawn 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, wherein   the drawing member is formed from a body part and a tip part, the tip part comprising a tip having a horizontal cross section smaller than that of the body part.   
     
     
         18 .- 26 . (canceled) 
     
     
         27 . A pulling-up-type continuous casting method comprising:
 a step of submerging a drawing member into a molten-metal surface of molten metal held in a holding furnace; and   a step of drawing the molten metal by the drawing member and making the drawn 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, wherein   the drawing member is formed from a body part, and at least one of a first protrusion part protruding from a side of the body part and a first recessed part recessed from the side of the body part.   
     
     
         28 - 32 . (canceled)