A decoupling control method and system for thickness and tension of a single-stand cold rolling mill

Abstract

The invention provides a thickness and tension decupling control method for a single stand cold rolling mill. The method comprises the steps that speed compensation dosage corresponding to feedforwardAGC control quantity is obtained through calculation; speed compensation dosage corresponding to design flow AGC control quantity is obtained through calculation; speed compensation dosage corresponding to monitoring AGC control quantity is obtained through calculation; speed compensation dosages corresponding to AGC ways are summed to obtain total speed compensation dosage, the total speed compensation dosage is converted to accelerating torque compensation dosage, the accelerating torque compensation dosage is provided for a transmission control unit of an inlet rolling machine, the transmission control unit controls the torque of the inlet rolling machine, and inlet tension is compensated during thickness control. The inlet tension is controlled in advance according to thickness control quantity, the strong coupling relation between thickness control and tension control is weakened, then, the overall thickness control and tension control precision is improved, and the yield is improved.

Description

technical field [0001] The invention relates to the technical field of steel rolling control, in particular to a decoupling control method and system for thickness and tension of a single-stand cold rolling mill. Background technique [0002] The cold rolling mill is a process in which the uncoiler, steering roll, rolling mill frame and coiler are all mechanically connected into a whole through the rolled strip to form a tension rolling process. Therefore, rolling tension is a very important parameter in the strip production process and must be strictly controlled. At the same time, strip thickness is the most important indicator of product quality, so thickness control and tension control systems are indispensable and important components in the electronic control system of modern cold rolling mills. [0003] The thickness control system of a single-stand reversing cold rolling mill generally includes three automatic gauge control methods: feedforward, second flow, and mon...

AI Technical Summary

Problems solved by technology

Obviously, there is a strong coupling relationship between thickness control and tension control. If no compensation is made, the out-of-tolerance length of the strip will be greatly increased, and the product yield will decrease, resulting in great waste and cost increase.

[0008] At present, the decoupling control methods of rolling mill thickness and tension are mostly concentrated on theoretical research, and some literatures use intelligent decoupling control methods, such as recurrent neural network, multivariable robust decoupling control, etc. Most of the papers are proved by simulation experiments its effectiveness, however, considering the complexity of these intelligent decoupling algorithms, it is difficult to apply in practice

There is also a diagonal matrix decoupling control method to solve this problem, and it has been used on some units, but this method requires a more accurate system transfer function model, and the actual complex system is often time-varying nonlinear, this method The control accuracy will be greatly affected

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