Up-drawing continuous casting method

Abstract

An up-drawing continuous casting method according to one aspect of the invention is an up-drawing continuous casting method for forming a bent shape in a cast casting by forming the casting in a first direction and then changing an up-drawing direction to a second direction and forming the casting in the second direction. This up-drawing continuous casting method includes drawing up the molten metal in the first direction; and changing the up-drawing direction to a third direction in which an angle between the third direction and the first direction is greater than an angle between the second direction and the first direction, from after a portion that will have the bent shape passes through the molten metal passage portion until the portion that will have the bent shape reaches a solidification interface, and then drawing up the molten metal.

What is claimed is: 
     
         1 . An up-drawing continuous casting method for forming a bent shape in a cast casting by forming the casting in a first direction and then changing an up-drawing direction to a second direction and forming the casting in the second direction, the casting being formed by drawing up molten metal held in a holding furnace from a molten metal surface of the molten metal, passing the molten metal through a molten metal passage portion of a shape determining member that determines a sectional shape of the casting, and solidifying the molten metal, the up-drawing continuous casting method comprising:
 drawing up the molten metal in the first direction; and   changing the up-drawing direction to a third direction in which an angle between the third direction and the first direction is greater than an angle between the second direction and the first direction, from after a portion that will have the bent shape passes through the molten metal passage portion until the portion that will have the bent shape reaches a solidification interface, and then drawing up the molten metal.   
     
     
         2 . The up-drawing continuous casting method according to  claim 1 , wherein
 the third direction is determined such that a direction in which the portion that will have the bent shape heads toward the solidification interface from the molten metal passage portion, when the portion that will have the bent shape reaches the solidification interface, comes to match the second direction.   
     
     
         3 . The up-drawing continuous casting method according to  claim 1 , further comprising:
 changing the up-drawing direction to the second direction and drawing up the molten metal, after the portion that will have the bent shape reaches the solidification interface.   
     
     
         4 . The up-drawing continuous casting method according to  claim 1 , wherein
 the up-drawing direction is changed to the third direction and the molten metal is drawn up, when the portion that will have the bent shape is midway between the molten metal passage portion and the solidification interface, or is closer to the solidification interface than midway between the molten metal passage portion and the solidification interface.