ROLL LEVELING METHOD FOR MULTIPASS ROLLING MILL

摘要

PURPOSE:To perform roll leveling at a setup and to prevent meandering by detecting a meandering quantity in each pass of a rolling material and by providing the right and left balance cylinders supporting pivotally work rolls with a load difference based on the meandering quantity. CONSTITUTION:Load signals detected by load cells 10 and 11 and meandering signals of a rolling material S detected by meandering quantity detectors 20, 21 and 22 are sent to an arithmetic controller 23. A rolling force and a load difference are obtained by the controller 23. The right and left load differences are obtained based on the rolling force and load difference given by the controller 23, a meandering quantity, and a set value; and those signals are sent to servo valves 16-19. Controlled pressure oil is supplied to reducing cylinders 9 and balance cylinders 13-15 and a prescribed load difference is given to the right and left reducing cylinders 9 and the balance cylinders 13-15. Pressure signals detected by dectors 24-26 are fed back to the controller 23, which outputs no signal to the servo valves when the load difference reaches the prescribed value. Rolls 1-4 incline to follow the taper of the material S and a roll leveling with a plate existing is completed.