A Pass Transfer Control Method Adaptive to Rolling Force for Reversing Rolling Mills

Abstract

The invention relates to a pass transfer control method with adaptive rolling force for a reversible mill. The method comprises the following steps: acquiring the set value of a rolling force from the strength grade, the inlet thickness grade, the outlet thickness grade and the pass of a steel type according to different incoming material strength of the steel type, then acquiring the adaptive coefficients of a roll and strip head rolling force of the roll, and then acquiring the adaptive coefficients of the roll and strip tail rolling force of the roll, and finally acquiring the adaptive coefficients of the rolling force between the passes of the same steel roll; the rolling force adaptive coefficient completes calculation on the adaptive coefficients of the roll and the strip tail rolling force of the roll when the current pass halts, corrects the adaptive coefficient of the strip head rolling force of next pass, and controls the strip head of the next pass by using the corrected rolling force set value. According to the invention, calculation precision of the strip head rolling force can be improved, rolling stability and thickness control precision of the strip steel at the strip head rolling section can be promoted, strip fracture can be effectively prevented, thickness overproof length can be reduced, and the requirement of users on improving product quality can be met.

Description

technical field [0001] The present invention relates to a control method, in particular to a method for calculating and controlling the rolling force of a reversible rolling mill in the field of iron and steel production so as to transfer the rolling characteristics to the next pass, so as to improve the rolling performance of the subsequent pass. Pass transfer control method for stability and thickness control accuracy. Background technique [0002] At present, a reversible rolling mill is widely used in the strip rolling process in various iron and steel production enterprises. Force, and greatly increased the rigidity of the rolling mill. Therefore, it is suitable for rolling medium-thick steel strips of various sizes and specifications, especially medium-thick steel strips with large rolling widths and strict requirements on precision and shape. Both hydraulic and electric control have high precision and control requirements. Among them, among various technical indicat...

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Problems solved by technology

[0004] 1. Using the combined roll gap correction value and zero point correction to improve the adaptive ability under the roll gap model, thereby improving the setting accuracy of the model and realizing the precise control of the strip thickness. This method requires a lot of calculations in the early stage The roll gap correction value and zero point correction are used to improve the roll gap model, and it is quite troublesome and time-consuming in the case of changing rolling plan specifications;

[0005] 2. Through the development of AGC control technology, the method of realizing real-time thickness control through the method of roll gap compensation, this method involves the development of control technology, the software cost is high, and it is the same as the above technology, once the rolling plan specification changes Under certain circumstances, it is difficult for a set of control technology to target strips of various specifications;

[0006] 3. The method of realizing precise thickness control based on the principle of equal flow per second. This method is simple to calculate and low in cost during implementation. The fluctuation of the strength of the strip makes the calculation result of the collected data fluctuate greatly, which affects the accuracy of the final calculation result

[0007] To sum up, it is difficult to solve the fluctuations in the strength of the incoming strip steel of the same steel type and specification when the reversible rolling mill is rolling the strip steel, which causes the deviation of the set value of the rolling force of different strip steel, and Difficult to adjust to a reasonable range of thickness difference, easy to break the belt, the whole section is a problem of out-of-tolerance

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