ROLLING METHOD AT DIFFERENT SPEEDS AND ROLLING MILL

PURPOSE:To prevent snaking and to perform stable rolling at different winding speeds even if tension is low by detecting directly the snaking quantity of a rolled material and controlling right and left gaps so as to change the same until the difference is made zero. CONSTITUTION:When a rolled material 9 snakes, the quantity thereof is detected with a snaking detector 17, and is compared with a target value by an adding amplifier 20, by which the deviation signal for the snaking quantity is generated. The signal 22 is processed with an adjuster 21 for controlling the snaking, and the output from the adjuster 21 is applied as signals 23, 24 for correcting right and left rolling down to adding amplifiers 15, 16. The signals for displacing the distons of hydraulic cylinders 7, 8 and the signals for correcting the rolling down are compared in the amplifiers 15, 16, and servocontrol valves 11, 12 control the inflow and outflow rates of the pressure oil to the cylinders 7, 8 in accordance with the differential signal. As a result, the right and left roll gaps are changed, by which the progression of the snaking is prevented and the target value given by a storage circuit 18 is restored for the material 9.