Plate shape control method of hot rolled high-strength thin strip steel

Abstract

The invention provides a plate shape control method of hot rolled high-strength thin strip steel. A work roll shifting mill is used as a finishing mill group; the adopted roll shape of a work roll is a cosine roll type curve; a varying contact supporting roll shape technology is adopted by the roll shape of a supporting roll; a high-frequency large-stroke roll shifting strategy is performed; the proportion convexity of the strip steel reaches a set target proportion convexity through front four finishing mills; a rear mill keeps a constant proportion convexity; the plate shape straightness target value is 0-5 IU; an edge masking technology is adopted by laminar cooling; and the strip steel rolling rhythm is controlled to be 135-145 s / roll. Through integral design of a plate shape control system of type configuration, roll shape design, process system, model control and the like, the problems of large fluctuation of the plate shape of the high-strength thin strip steel and uncontrolled composite wave shape in a rolling process are solved, and the straightness of the hot rolled high-strength thin strip steel can be controlled at a high standard level within 20 IU, so that the plate shape quality of the high-strength thin strip steel is greatly improved and the disqualification rate is reduced.

Description

technical field [0001] The invention belongs to the technical field of steel rolling technology, in particular to a method for controlling the shape of hot-rolled high-strength thin strip steel. Background technique [0002] The so-called high-strength thin strip steel refers to hot-rolled high-strength thin strip steel with a thickness of ≤2.0mm and a yield strength of ≥550MPa. Because high-strength thin strip steel has a series of advantages such as high strength, light weight, less material consumption, and cost savings, it is a "green" and sustainable economical steel. Therefore, it is used in industries such as automobiles and containers at home and abroad. be widely used. However, with the continuous improvement of the industrial automation level, although the thickness, width, structure and properties of high-strength thin strip steel can meet the needs of users, the problem of inconsistent plate shape has become increasingly prominent, especially for high-strength t...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a flatness control method for hot-rolled high-strength thin strip steel, that is, through the integrated design of flatness control systems such as machine configuration, roll shape design, process system and control model, the rolling process can be solved. Uncontrollable problems such as large fluctuations in the shape of medium and high-strength thin strip steel plates, compound waves, etc., so as to effectively improve the shape quality of high-strength thin strip steel plates

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