Method for controlling width of hot rolling strip steel

Abstract

The invention belongs to the technical field of hot rolling production and control, and provides a method for controlling the width of hot rolling strip steel. Width-measuring devices are additionally arranged at the front and the back of a vertical rolling mill of width-controlling equipment, width data of strip billets at the front and the back of a horizontal mill are collected in real time, the real-time width data are transmitted to a data acquisition system before the strip billets enter the mill, and the data acquisition system transmits the width data to a model system; the model system compares the width data acquired in real time with predicted data predicted by a model, and then determines whether width control is corrected or not, if width disturbance is large, width open loop feedforward control is carried out at first, after the belt billets leave the width-controlling equipment and the horizontal mill, mill rear width detection equipment sends corresponding data to the model system, the model system carries out calculation again, on-line control of a vertical roll is achieved through basic automation, and therefore closed loop feedback control is formed. Width detection is carried out on a plate billet at first before the plate billet enters the width-controlling equipment, dynamic correction is carried out on basic automation system control equipment, and therefore the width disturbance is reduced, and width feedforward and feedback dynamic control is realized.

Description

technical field [0001] The invention belongs to the technical field of hot-rolling production control, and in particular relates to a method for controlling the width of hot-rolled strip steel. Background technique [0002] The width of hot-rolled strip has always been an important indicator of hot-rolled strip products. At present, the width control technology at home and abroad is to use the width gauge equipment after the rolling mill to carry out width feedback control. The main principle is that after the hot-rolled strip passes through the width control equipment, the on-site instrument samples the width data, and submits the sampled feedback data to the width control model module. Compared with the target value, if the two width values ​​are basically the same, it is considered that the width control is correct and no width correction control is adopted. If there is a deviation, that is, width disturbance, then the width correction is performed to ensure the width con...

AI Technical Summary

Problems solved by technology

The main principle is that after the hot-rolled strip passes through the width control equipment, the on-site instrument samples the width data, and submits the sampled feedback data to the width control model module. If the two width values ​​are basically the same, it is considered that the width control is correct and no width correction control is adopted. If there is a deviation, that is, width disturbance, then the width correction is performed to ensure the width control accuracy. This control method has an important The disadvantage is: poor adaptability to disturbances such as changes, that is, if the detected deviation is large, the feedback cannot adjust the width reasonably

[0003] In the actual production process, it often happens that after the incoming hot-rolled slab passes through the width control equipment, there is a large deviation between the feedback value and the pre-calculated value, and the feedback correction cannot meet the production control accuracy requirements.

The main reason for this phenomenon is that when the interference factors such as the width deviation of the slab incoming material are large, the equipment cannot obtain the possible width disturbance in advance, so the corrected width control process cannot be performed, resulting in a large deviation in the actual width control

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