JPS5540050A - Bulging control continuous casting method - Google Patents

Abstract

PURPOSE: To prevent the occurrence of internal cracking and central segregation in the slab by detecting the bulging quantity in the specified positions of the slab from roll reaction force and determining the positions of bulging correcting rolls thereby performing controlling at the time of performing continuous casting of molten steel.

CONSTITUTION: A continuously cast slab 13 is cooled by the secondary cooling zone constituted by plural stands and is thereby pulled out. Here, lower pinch rolls 16 are assembled and fixed to lower frames 19 and rolls 14 are fixed to upper frames 18. The rolls 15 are fixed to hydraulic cylinders 17 independently from the frames and the upper frames 18 are mounted to hydraulic cylinders 20 so as to permit changing of their relative positions with respect to the lower frames 19. The reaction forces of the rolls are momentarily obtained by load detectors 21, pressure detectors 22, etc. and bulging is corrected while changing the roll gaps so that the reaction forces become within the permissible reaction force for bulging correction in all the roll positions. There is no production of cracking and internal segregation in the slab and the sound slab is obtained.

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