Roll-shifting strategy control of high-order curved work rolls in hot rolling considering wave shape and cross-section

Abstract

The invention relates to a hot rolling high-order curve work roll shifting strategy control taking both wave shape and section into consideration. A high-order curve work roll is mainly used for controlling proportion convexity between racks in hot rolling and further controlling the wave shape, when wave shape control is relatively stable in rolling in the same specification, the calculation value of high-order convexity work roll shifting is always kept unchanged, parts of a work roll is likely to be abraded, and the shape of the section of strip steel which is subsequently rolled is affected. On the basis of continuous judgment of the calculation value of a roll shifting position, an oscillation roll shifting strategy taking both wave shape and section into consideration is developed for the high-order curve work roll, and actual application results show that the roll shifting strategy can effectively improve the shape of the section of the strip steel in the rolling in the same specification.

Description

technical field [0001] The invention relates to metallurgical machinery, automation, and rolling technology, and specifically refers to a roll-shifting strategy control for hot-rolled high-order curved work rolls that takes into account wave shape and cross-section. [0002] technical background [0003] Work roll shape technology is the key technology for shape control in the hot rolling production process. In recent years, especially high-order curve work rolls have been widely used in the hot-rolled strip production process, such as CVC work rolls (Siemag, Germany Development, cubic polynomial curve), HVC work roll (developed by University of Science and Technology Beijing, China, fifth degree polynomial curve), SmartCrown work roll (developed by VAI, composite roll shape of polynomial and Sin function), etc. figure 1 It is a quintic polynomial high-order curve HVC work roll, the curve equation is S-shaped, and the upper and lower work rolls are placed anti-symmetrically. ...

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Problems solved by technology

[0007] Patent 4 "A Method for Eliminating Local Wear of Work Rolls in CVC Mills" (Application No.: 201110281509.4) proposes to change the frequency and amplitude of periodic roll shifting of CVC work rolls to achieve the purpose of eliminating local wear of work rolls, which is in line with what this patent needs to achieve The purpose is similar, but it is used to judge whether the width difference between the rolling sequences meets the conditions to start the periodic roll shifting mode. Whether this judgment condition is reasonable is worth discussing. If the width difference is used as the starting period condition, the width is similar , when the thickness and steel type are different, the CVC periodic roll shifting mode is also started, and the bending force is used as compensation, which will largely sacrifice the roll shifting performance of the CVC, and the bending force is likely to appear at the limit position. The bending force at the extreme position cannot provide margin for closed-loop control

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