PLATE WIDTH CONTROL METHOD OF ROLLED STOCK

PURPOSE:To elevate the produce quality by detecting the plate width of at least one part of rolled stock of the inlet side and outlet side of a rolling mill and by varying the distance between a work roll tapered part and an end edge of a rolled stock according to the deviation with a target value. CONSTITUTION:The feedback control of a plate width to the target plate thickness is performed by changing upper and lower work rolls 1a, 1b simultaneously in reverse direction to the axial part according to the deviation between the plate width detected by a plate width detector 3 and the target plate thickness. Namely, the plate width detected by the detector 3 is inputted into a computing element 4 and converted to a roll gap area from the deviation with the target width. The target shift position of a roll is also calculated with adding the deviation to the actual area which is found from the actual shift position and inputted into a position controller 5. The device 5 then moves symmetrically in the axial direction the rolls 1a, 1b via shifting devices 6a, 6b. Consequently due to good plate width control being enabled, the product quality is elevated.