Patent ID: 8166785

Claim:
A rolling mill apparatus, comprising: a rolling mill, which rolls a rolled strip between upper and lower work rolls placed opposite each other; a shape detecting portion, which detects a degree of flatness of the rolled strip in a width direction of said rolled strip which has been rolled by said rolling mill; a spray portion, having a plurality of spray nozzles arranged along a length direction of said upper and lower work rolls, which sprays said upper and lower work rolls with coolant; and a shape control portion configured to control at least one of a spray amount and temperature of the coolant sprayed from said spray portion based on detected information from said shape detecting portion, to control the shape of said rolled strip; wherein said shape control portion is configured to have two control modes to be used to control at least one of the spray amount and temperature, said shape control portion is configured to switch between said two control modes based on a strip thickness of said rolled strip, and each of said two control modes in which the relationship between the detected information of said shape detecting portion and at least one of the spray amount and temperature of the coolant sprayed from said spray portion is inverse to the other mode.