STRONG DRAFT ROLLING MILL

摘要

PURPOSE:To provide a rolling mill which can finish a thin continuous casting billet having 20-50mm. thickness to a hot strip at a low initial cost by providing further a press roll pair between the multiplex type rolling rolls having the rolling and pushing roll pair and the other small-diameter work roll pair in the same housing. CONSTITUTION:Quadruple type rolls 21 for strong draft and duplex type rolls 22 for rolling and pushing of a material 10 to be rolled on the inlet side of said rolls are incorporated into a housing 20. The rolls 21 consist of a work roll pair 11 and a backup roll pair 12 supported respectively by chock pairs 15 and 16 and the rolls 22 consist of a roll pair 13 for pushing supported by a chock pair 17. The rolls 21, 22 can be respectively and independently set at the gaps by rolling down screws 18, 19. A press roll pair 23 for preventing buckling is provided to a chock pair 17. While the material 10 which is a thin billet is rolled by the rolls 22, the material is pushed to the rolls 21 by the backward compressive force exerted thereto and is further reduced in thickness by the roll pair 11. The large compressive force acts on the material 10 between the roll pairs 13 and 11 during this time but the roll pair 23 and the roll pair 11 deviate toward the roll pair 13 side and therefore buckling is obviated.