AGC (Automatic Gain Control) method capable of calculating thickness based on second flow

Abstract

The invention relates to an AGC (Automatic Gain Control) method capable of calculating thickness based on second flow, and the method is especially suitable for production and control of cold-rolled strip steels and belongs to the technical field of cold-rolled sheet processing of metallurgical industry. The method comprises the following steps of: calculating the thickness of the strip at the outlet of a rolling mill by a control model of second flow AGC; when a tachymeter cannot work regularly, measuring the speed of the strip at the outlet of the rolling mill by calculation instead of using the tachymeter, and participating in the second flow AGC; modifying a speed parameter to ensure the stability of the rolling process; and using the obtained roll gap and speed adjustment quantity in the thickness control of the rolling mill to realize closed-loop control of the second flow AGC. The method has the following beneficial effects: when a first frame outlet tachymeter cannot work regularly, closed-loop control of the second flow AGC is realized by the method when the tachymeter cannot work regularly, the conditions of production accidents caused by failure of the tachymeter in the production process are reduced, the control accuracy of strip steel thickness is improved and the production requirements are satisfied.

Description

technical field [0001] The invention relates to an AGC control method for calculating the thickness based on the second flow rate, which is particularly suitable for the production and control of cold-rolled strip steel, and belongs to the technical field of cold-rolled plate processing in the metallurgical industry. Background technique [0002] In the continuous cold rolling production process, AGC (Automatic Gauge Control) refers to the automatic thickness control method adopted in the rolling process to control the thickness of the exit of the rolling mill within the allowable range of the set target. Mill AGC includes feedforward, feedback, second flow, eccentricity compensation and other controls. AGC feed-forward control is to send the roll gap correction amount to the correction cylinder of the frame according to the change of the entrance strip thickness, and the acceleration correction amount is sent to the speed parameter to improve the effect of roll gap correcti...

AI Technical Summary

Problems solved by technology

In the actual production process, due to reasons such as system design and on-site environment, the speedometer of the first rack cannot be put into use normally, resulting in large fluctuations in the thickness of the strip steel at the outlet of the first rack, which seriously affects the thickness control accuracy. When the first rack When the thickness of the outlet is ultra-thin, there will be major production accidents such as loss of tension at the entrance and broken belt of the first rack

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