To obtain stable hot lubricated rolling by minimizing the fluctuation of thickness and strip tension at the start or the end of applying a lubricating fluid in hot lubricated rolling.
A rolling line 100 imparts to a reference value setting device 400 a draft position measured by a selsyn device 106 immediately after rolling the tip end of a rolled stock, rolling load measured by a load cell 105, and a command value of a rolling speed, as each reference value for draft position, rolling load and rolling speed; the rolling line also imparts to a control device 200 a draft position, rolling load and tension measured at each point of time. In the control device 200, a thickness controller calculates a thickness control deviation from the deviation between the present value of draft position/rolling load measured at each point of time and the reference value at present imparted by the reference value setting device 400, converts the calculated deviation to a displacement of the draft position, determines a correction for the draft position by applying algorithm, controls the draft position of the roll and makes the thickness constant in the longitudinal direction of the rolled stock.
YOSHITANI NAOHARU
KONNO YUSUKE
UMEMURA JUN
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