Abstract: A driving device driving motors of rolling rolls that corrects asymmetry between top and bottom roll driving systems of a twin-drive rolling mill in which top and bottom rolling rolls are driven by upper and lower motors, respectively, so that torques propagate to the top and bottom rolling rolls simultaneously. To this end, an upper/lower axis system imbalance correction section that corrects inequalities of torques propagating to the top and bottom rolling rolls is provided in either one or both of an upper motor control section that controls the upper motor and a lower motor control section that controls the lower motor in a driving device of motors for rolling rolls used in a rolling mill. The top and bottom rolling rolls are driven by the upper motor and the lower motor, respectively, and one of the upper motor and the lower motor is located on a rolled material. Thus, torques propagate to the top and bottom rolling rolls simultaneously.

Abstract: An apparatus for detecting a roll eccentricity in a rolling mill includes mark pulse generators each provided for upper and lower rolls from which an eccentricity is to be detected, the mark pulse generator generating one pulse per one rotation of the roll, sampling pulse generators each provided for the upper and lower rolls for generating n pulses per one rotation of the roll, and a rolling pressure detector for the rolls.After a mark pulse is generated, the rolling pressure signal outputted from the rolling pressure detector is first stored at the output timings of the sampling pulses. Next, a difference of the rolling pressure signals outputted from the rolling pressure detector is subjected to a Fourier transformation, the rolling pressure signals corresponding to those obtained after and before the relative phases of the upper and lower rolls are changed. The resultant values together with rotary angles and relative phases are used to output an eccentricity quantities independently for each roll.