Plate thickness control device for tandem rolling mill

Abstract

To provide a plate thickness control device of a tandem rolling mill that can suppress the influence of eccentricity of a work roll and achieve high-precision control of the outlet side plate thickness of a final stand even when a plate thickness gauge is not installed on the inlet side of the final stand.SOLUTION: A plate thickness control device includes a mass flow plate thickness calculation unit and a final stand plate thickness control unit. The mass flow plate thickness calculation unit calculates the mass flow plate thickness at the outlet side of a preceding stand using the inlet side plate thickness actual value measured by an inlet side plate thickness gauge installed on the inlet side of the preceding stand arranged immediately before the final stand, the inlet side plate speed actual value measured by an inlet side plate speed meter arranged on the inlet side of the preceding stand, and the outlet side plate speed actual value measured by an outlet side plate speed meter arranged on the outlet side of the preceding stand. The final stand plate thickness control unit performs feedforward AGC for the final stand using the mass flow plate thickness calculated by the mass flow plate thickness calculation unit.SELECTED DRAWING: Figure 1

Claims

[Claim 1] A thickness control device for a tandem rolling mill that controls the thickness of a rolled material being rolled in a tandem rolling mill having multiple rolling stands, Each rolling stand has a work roll, the rolling stand located at the end of the conveying direction of the rolled material is designated as the final stand, the rolling stand located immediately before the final stand is designated as the preceding stand, and no thickness gauge is placed between the preceding stand and the final stand. A mass flow thickness calculation unit calculates the mass flow thickness at the exit side of the preceding stand using the actual value of the entry side plate thickness measured by an entry side plate thickness gauge located on the entry side of the preceding stand, the actual value of the entry side plate speed measured by an entry side plate speed meter located on the entry side of the preceding stand, and the actual value of the exit side plate speed measured by an exit side plate speed meter located on the exit side of the preceding stand. A pre-stand thickness control unit performs feedforward AGC of the pre-stand using the mass flow thickness calculated by the mass flow thickness calculation unit, A final stand thickness control unit performs feedforward AGC of the final stand using the mass flow thickness calculated by the mass flow thickness calculation unit, Equipped with, A thickness control device for a tandem rolling mill, wherein the mass flow thickness used in the preceding stand thickness control unit is shifted up to the final stand thickness control unit.

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