Composite rolling mill clad-rolling large-lag AGC (automatic gain control) method

Abstract

A composite rolling mill clad-rolling large-lag AGC (automatic gain control) method includes the steps: 1) calculating a sampling period according to current line speed and the distance between a thickness meter and a roll gap; 2) averaging sampled signals in a plurality of periods to obtain a final sampled value; 3) dividing the final sampled value into different intervals according to a current strip plastic curve and performing staged integral control for deviation between an actual value and a set value of a strip steel thickness according to the intervals; 4) enabling integral controllers in the intervals to generate continuous roll gap modification values by a thickness deviation integral controller using corresponding integral control parameters in the divided sampled value interval; 5) smoothing the roll gap modification values by the aid of a constant rate slope at an interval switching position, and switching roll gap set values with low interference. According to the method, metal strip finished product quality can be improved, rolling mill roll gap movement range is narrowed, and the service lives of a roll and a servo valve are prolonged.

Description

technical field [0001] The invention relates to the field of cladding rolling of metal strips, in particular to a large time-delay AGC control method for cladding rolling of a compound rolling mill. Background technique [0002] In recent years, due to the overcapacity of my country's iron and steel industry and the lack of independent core technology to support the industry's technological upgrading, the development of the industry has faced difficulties. Metal composite materials have great advantages in improving product performance, reducing product cost, saving rare metal resources and reducing environmental pollution, and are an important development direction of the new material market. [0003] Automatic thickness control is to continuously measure the actual rolled thickness of the strip through thickness gauges or sensors (such as roll gap gauges and indenters, etc.), and according to the deviation signal after comparing the measured value with the given value, wit...

AI Technical Summary

Problems solved by technology

[0004] In the clad rolling of traditional cladding mills, the rolling speed is often very slow, and there is a certain distance between the exit thickness gauge and the roll gap. There is a problem of large time lag when using traditional feedback AGC control, and the scanning period of the control system is often far away. If the speed is higher than the corresponding feedback speed, the AGC roll gap correction amount may diverge, and the thickness fluctuates violently, which makes the operator need to repeatedly adjust the roll gap or the rolling force setting value, which increases the operator's work intensity and reduces the operator's workload. work efficiency; in addition, the frequent and large-scale movement of the roll gap will affect the product quality and ultimately reduce the output per unit time of the rolling line

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