SHAPE CONTROLLING METHOD, MANUFACTURING METHOD AND MANUFACTURING APPARATUS OF HOT-ROLLED PLATE

摘要

PROBLEM TO BE SOLVED: To provide a shape controlling method of a hot-rolled plate by which the defective shape in the rear end part of a material to be rolled is effectively reduced.

SOLUTION: In this shape controlling method, the closed loop control of a shape control actuator 2 at a first control gain G1 is performed until at least the nose of the material M to be rolled is wound with a winding reel 6 installed on the downstream side of a hot rolling mill 1 and the first control gain G1 is switched to a second control gain G2 which is larger than the first control gain at a prescribed timing after the nose of the material M to be rolled is wound with the winding reel 6 until the detection of the defective shape of the material M to be rolled with a shape gage 3 is started. On and after the prescribed timing, the closed loop control of the shape control actuator 2 is performed at the second control gain G2.

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