FINISH ROLLING DEVICE FOR WIRE OR BAR STEEL

摘要

PROBLEM TO BE SOLVED: To provide a finish rolling device for a wire or a bar steel capable of materializing high-accuracy and high-response impact drop compensation.;SOLUTION: The finish rolling device for a wire or a bar steel is provided that includes a block mill having: a plurality of stands which continuously rolling material being a wire or a bar steel in one direction in a finish rolling process of a wire/bar steel rolling line; and electric motors which are respectively provided in the plurality of stands and drive the stands according to an individually calculated electric motor torque indication value. On the basis of a rolling speed of the i-th stand when a tip of the material is bitten by the i-th stand of the block mill, a deceleration torque in the i-th stand is calculated. The electric motor torque indication value to be given to the electric motor of the i+1th stand is calculated by reflecting each deceleration torque from the first stand up to the i-th stand on a torque target value of an electric motor of the i+1th stand which is set in accordance with a speed target value of the stand when the tip of the material is bitten by the i+1th stand.;SELECTED DRAWING: Figure 4;COPYRIGHT: (C)2016,JPO&INPIT