Optimal control method for flatness of twenty-high rolling mill based on feed-forward-intermediate roll shifting compensation

Abstract

The invention discloses a flat shape optimization control method of a 20-high rolling mill based on feedforward-intermediate roll shifting compensation, collecting data to obtain real-time feedforward-intermediate roll shifting compensation amount ΔS and calculating the deviation value ΔS i ‑Collect four real-time plate shape tensile stress data Δσ i ‑Calculate the deviation value Δε of four flatness data i Corresponding plate shape factor a i ‑Calculate the wave shape value Δε of the plate on the working side and the plate on the transmission side DS 、Δε WS ‑Set the calculation value S after obtaining the final intermediate roll shifting feed-forward compensation ref补偿后 Accurate closed-loop control of an intermediate roll shifting based on automatic position control. The addition of the feedforward-intermediate roll shifting compensation control function reduces the frequency of operators manually intervening in shape control, reduces the operator's difficulty in operation and labor intensity; improves the quality of strip products and ensures the safety of rolling new steel types. Stability is conducive to the development of new products and the improvement of production capacity and economic benefits.

Description

technical field [0001] The invention relates to the technical field of automatic flatness control for cold-rolled strip production, in particular to a flatness optimization control method for twenty-high rolling mills based on feedforward-intermediate roll shifting compensation. Background technique [0002] The purpose of shape control is to roll out a strip with a straight shape, that is, the flatness control of the strip. The shape control performance directly affects product quality and production stability. [0003] When a coil of steel is ready to be rolled, or before the strip enters the roll gap of the rolling mill, it is necessary to pre-set the adjustment amount of the rolling mill's flatness control mechanism, such as the offset of the pressing inclination, the radial expansion of the AS-U roll , Axial lateral movement of an intermediate roller, etc. At this time, according to the relevant parameters such as the thickness, width, material, and reduction of the s...

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Problems solved by technology

[0006] Shape control is affected by a large number of nonlinear factors, such as incoming material defects, roll original crown, roll wear, rolling speed, temperature distribution, etc. The dynamic characteristics of the rolling process are very complex, and the existing control methods can be better Stable control of the flatness of a single steel type is performed, but when rolling a newly developed steel type, and when the rolling mill accelerates and decelerates the rolling, the response of the flatness control is slow, and the flatness control effect is not good, requiring frequent manual operations by the operator The operation interferes with the AS-U roll, the first intermediate roll shifting, and the tilting of the reduction, and it is very difficult to adjust during the high-speed rolling process, which cannot meet the precise control requirements of the strip shape, which seriously affects the strip shape quality and production stability of the strip product. Therefore, it is necessary to optimize the existing flatness control method

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