METHOD OF CONTINUOUS CASTING FOR SMALL-SECTION CAST PIECE

摘要

A method of continuous casting in which casting is performed by the use of a curved or vertical continuous casting machine while vertically oscillating a mold. In the method of continuous casting for small-section cast piece, between pinch rolls and a pinch roll driving motor for cast piece pullout, there is provided pullout rate increasing or decreasing means consisting of an elastomer or combination of elastomer and dumper and having plays in the direction of drive rotation and anti-drive rotation direction so that the extent of shift by the plays from the neutral position thereof to the drive direction or anti-drive direction is in the range of ±2 to ±30 mm, in terms of the circumferential length of pinch roll, in the drive direction, the pullout rate increasing or decreasing means having a return force to the neutral position, so that the cast piece pullout speed is rendered lower than the average pullout speed in the period of mold rise and faster in the period of mold descent, and so that the cast piece length, secondary cooling ratio water quantity, casting speed, oscillation amplitude and oscillation frequency are rendered appropriate. Consequently, the frictional resistance between mold and cast piece can be stably reduced, and any penetration burn of cast piece on the mold, etc. can be prevented, thereby realizing continuous casting of small-section cast piece under stable operation.