Twin-Roll Continuous Casting Machine And Twin-Roll Continuous Casting Method

Abstract

When a molten steel ( 106 ) is supplied into a moving mold defined by concave rolls ( 101, 102 ) and side checks ( 103, 104 ), the molten steel ( 106 ) is cooled by the surfaces of the rolls (surfaces except steps) to form solidified shells ( 111, 112 ). Both solidified shells ( 111, 112 ) are pressure bonded, and pulled out as a cast piece ( 113 ). A heat insulator (ceramic coating) has been applied to the circumferential surfaces of steps ( 101 a, 101 b, 102 a, 102 b ) which are opposite end portions of the rolls. Thus, at these portions, heat dissipation does not proceed, and no solidified shells are formed. Hence, clearances are formed between the opposite ends of the solidified shells ( 111, 112 ) and the side checks ( 103, 104 ), and the solidified shells ( 111, 112 ) do not contact the side checks ( 103, 104 ), with the result that the wear of the side checks ( 103, 104 ) is prevented.

1 . A twin-roll continuous casting machine in which a molten steel is supplied into a moving mold constituted by a pair of rolls rotating in directions opposite to each other, and a pair of side checks pressed against end faces of the rolls, and a cast piece formed by pressure bonding solidified shells solidified on surfaces of the rolls is pulled out of a gap between the rolls, and
 characterized in that a heat insulator is applied to portions of peripheral surfaces of the rolls which are on opposite end sides with respect to a roll axis direction and which make a circle in a circumferential direction.   
   
   
       2 . A twin-roll continuous casting method involving a twin-roll continuous casting machine in which a molten steel is supplied into a moving mold constituted by a pair of rolls rotating in directions opposite to each other, and a pair of side checks pressed against end faces of the rolls, and a cast piece formed by pressure bonding solidified shells solidified on surfaces of the rolls is pulled out of a gap between the rolls, and
 characterized by performing continuous casting using the rolls having a heat insulator applied to portions of peripheral surfaces of the rolls which are on opposite end sides with respect to a roll axis direction and which make a circle in a circumferential direction.   
   
   
       3 . A twin-roll continuous casting machine in which a molten steel is supplied into a moving mold constituted by a pair of rolls rotating in directions opposite to each other, and a pair of side checks pressed against end faces of the rolls, and a cast piece formed by pressure bonding solidified shells solidified on surfaces of the rolls is pulled out of a gap between the rolls, and
 comprising a vaporizing material imparting device for imparting a vaporizing material to portions of peripheral surfaces of the rolls which are on opposite end sides with respect to a roll axis direction and which make a circle in a circumferential direction.   
   
   
       4 . A twin-roll continuous casting method involving a twin-roll continuous casting machine in which a molten steel is supplied into a moving mold constituted by a pair of rolls rotating in directions opposite to each other, and a pair of side checks pressed against end faces of the rolls, and a cast piece formed by pressure bonding solidified shells solidified on surfaces of the rolls is pulled out of a gap between the rolls, and
 characterized by imparting a vaporizing material to portions of peripheral surfaces of the rolls which are on opposite end sides with respect to a roll axis direction and which make a circle in a circumferential direction.   
   
   
       5 . A twin-roll continuous casting machine in which a molten steel is supplied into a moving mold constituted by a pair of rolls rotating in directions opposite to each other, and a pair of side checks pressed against end faces of the rolls, and a cast piece formed by pressure bonding solidified shells solidified on surfaces of the rolls is pulled out of a gap between the rolls, and
 in which each of the rolls has opposite ends, along a roll axis direction, of a larger diameter than a diameter of a middle portion of each of the rolls, and has steps at the opposite ends in the roll axis direction, and   characterized in that a heat insulator is applied to circumferential surfaces of the steps of the rolls.   
   
   
       6 . A twin-roll continuous casting machine in which a molten steel is supplied into a moving mold constituted by a pair of rolls rotating in directions opposite to each other, and a pair of side checks pressed against end faces of the rolls, and a cast piece formed by pressure bonding solidified shells solidified on surfaces of the rolls is pulled out of a gap between the rolls, and
 in which each of the rolls has opposite ends, along a roll axis direction, of a larger diameter than a diameter of a middle portion of each of the rolls, and has steps at the opposite ends in the roll axis direction, and   characterized by performing continuous casting using the rolls having a heat insulator applied to circumferential surfaces of the steps of the rolls.   
   
   
       7 . A twin-roll continuous casting machine in which a molten steel is supplied into a moving mold constituted by a pair of rolls rotating in directions opposite to each other, and a pair of side checks pressed against end faces of the rolls, and a cast piece formed by pressure bonding solidified shells solidified on surfaces of the rolls is pulled out of a gap between the rolls, and
 in which each of the rolls has opposite ends, along a roll axis direction, of a larger diameter than a diameter of a middle portion of each of the rolls, and has steps at the opposite ends in the roll axis direction, and   comprising a vaporizing material imparting device for imparting a vaporizing material to circumferential surfaces of the steps of the rolls.   
   
   
       8 . A twin-roll continuous casting method involving a twin-roll continuous casting machine in which a molten steel is supplied into a moving mold constituted by a pair of rolls rotating in directions opposite to each other, and a pair of side checks pressed against end faces of the rolls, and a cast piece formed by pressure bonding solidified shells solidified on surfaces of the rolls is pulled out of a gap between the rolls, and
 in which each of the rolls has opposite ends, along a roll axis direction, of a larger diameter than a diameter of a middle portion of each of the rolls, and has steps at the opposite ends in the roll axis direction, and   characterized by imparting a vaporizing material to circumferential surfaces of the steps of the rolls.   
   
   
       9 . The twin-roll continuous casting machine according to  claim 1  or  5 , characterized in that the heat insulator is a ceramic coating or a metallic or composite material. 
   
   
       10 . The twin-roll continuous casting method according to  claim 2  or  6 , characterized in that the heat insulator is a ceramic coating or a metallic or composite material.