Hot rolled strip convexity on-line closed loop control method

Abstract

The invention relates to a hot rolled strip convexity on-line closed loop control method. The method is characterized by comprising the following steps that (1) strip steel reaches an inlet of a finishing rolling unit, the required roll bending force set value of each rack of the finishing rolling unit is worked out through a finish rolling model according to temperature, thickness, width and materials of the strip steel and real-time roll shape of the rolls; (2) after each rack of the finishing rolling unit bites steel, the roll bending force of each rack is switched from balance force to the roll bending set value worked out through the finish rolling model; (3) during rolling of the finishing rolling unit, certain adjustment for the roll bending force is conducted according to change of the rolling force of each rack by means of the strip shape keeping function; and (4) the closed-loop control over strip steel convexity is added, during rolling of the finishing rolling unit, the adjustment value of the required roll bending force of each rack is worked out by means of a convexity-to-roll bending force conversion algorithm according to the deviation between the set value and a strip steel convexity feedback value real-timely detected by a finish rolling outlet profile gauge, the roll bending force of each rack of the finishing rolling unit is real-timely adjusted, and the closed-loop control over the strip steel convexity is achieved.

Description

technical field [0001] The invention relates to a closed-loop control method, in particular to an online closed-loop control method for hot-rolled strip crown. Background technique [0002] With the demand of the market, in order to achieve profitability, hot-rolled enterprises continue to expand their products to high-end products, and the precision of product quality control is getting higher and higher. In addition to the previously concerned thickness and width control precision, the convexity control precision of hot-rolled products also requires It is very strict, especially for high-end products such as automotive sheets and silicon steel. In addition to the high control accuracy of the product as a whole, it also requires high homogeneity of the product under the premise of high overall control accuracy, that is, the smaller the fluctuation of the control accuracy, the better. good. However, at present, the crown control of the strip in hot rolling enterprises is co...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the technical problems existing in the prior art, and provides a method for closed-loop control of hot-rolled strip crown, which solves the problem of low product crown control precision when rolling such products in current hot-rolling enterprises

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