Cold-rolled strip steel plate shape control system and method

Abstract

The invention discloses a cold-rolled strip steel plate shape control system and method. An advanced feedforward-feedback cooperative control architecture is adopted and after a plate shape automatic control system is put into on-line operation, plate shape variation and outlet plate shape real-time deflection caused by changes of convexity and rolling force are jointly calculated out by calculating links of the plate shape variation and the outlet plate shape real-time deflection which are caused by the changes of the convexity and the rolling force; and then an on-line regulation variable for control of a cold-rolled strip steel plate shape is calculated out at an optimal regulation variable calculating and amplitude limit processing link of a plate shape control mechanism. The time-delay influence of strip steel in transmission between a rolling mill and a plate shape gauge is eliminated and the precision for estimating the plate shape is ensured; and the technical problem of outlet plate shape quality variation caused by practical factors such as the convexity change and the rolling force fluctuation of supplied materials during the rolling process can be solved, so that the quality of cold-rolled strip steel products is enhanced remarkably.

Description

technical field [0001] The invention belongs to the field of cold-rolled strip steel, in particular to a cold-rolled strip shape control system and method. Background technique [0002] With the rapid development of domestic and foreign equipment manufacturing industries, downstream users have increasingly high quality requirements for cold-rolled strip products, especially for industries such as high-end automobiles and high-end IT product manufacturing. Cold-rolled strip steel is mainly used for stamping various parts. In order to improve the life of the heavy die and stamping precision, the cold-rolled strip steel is required to have better shape quality. Therefore, the research on flatness control technology plays a vital role in improving the core competitiveness of cold-rolled iron and steel enterprises. [0003] In order to control the exit shape of the rolling mill, people have developed a shape meter. It is usually installed at the exit of rolling to measu...

AI Technical Summary

Problems solved by technology

In fact, the rolling process is a very complex nonlinear system involving many types of influencing factors and time-varying characteristics. The predicted flatness calculated by the calibration model cannot replace the flatness measured by the flatness meter.

The current state of the art is: Predicting the shape can eliminate the transmission time lag, but the accuracy cannot be guaranteed. The shape meter actually measures the shape with high accuracy but has a transmission time lag.

In this case, both flatness feedback control and flatness predictive control have obvious disadvantages, and cannot meet the increasing technical requirements for flatness control accuracy.

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