Automatic control method of width of hot continuous rolling and finish rolling strip steel

Abstract

The invention relates to the field of strip steel hot rolling, in particular to a control method of the width of hot rolling strip steel. An automatic control method of the width of hot continuous rolling and finish rolling strip steel comprises the steps as follows: a temperature change model of the strip steel in a finish rolling process is built, sensitivity coefficients are calculated, and temperature reference values of the strip steel at rack outlets are calculated; temperature modification values of the strip steel at the rack outlets are calculated, and temperature prediction values are obtained in combination of the temperature reference values and the temperature modification values; real-time change values of the width of the strip steel are calculated; feedback deviation values of the width of the strip steel are obtained through comparison, and the feedback deviation values are distributed to racks, so that feedback deviation values of the width of the strip steel, which are required to be adjusted by the racks, are obtained; and tension of loops among the racks are adjusted in combination of the real-time change values of the width of the strip steel and the feedback deviation values of the width of the strip steel, so that the width of the steel strip is controlled. The method can well guarantee that the width of the strip steel after finish rolling can fluctuate nearby set values, the width accuracy of a strip product is finally improved, and accordingly, the utilization rate of a material by a downstream user is remarkably increased.

Description

technical field [0001] The invention relates to the field of strip hot rolling, in particular to a method for controlling the width of a hot strip. Background technique [0002] The finished width accuracy of hot-rolled strip steel is a very important technical index. For hot-rolled production, the quality of width accuracy directly affects the success rate of strip steel; for downstream users, it directly affects the raw material quality. utilization rate. Every time the width deviation is reduced by 1 mm, the yield can be increased by about 0.1% based on the actual finished strip width. Therefore, high-precision width control technology can significantly improve economic benefits. [0003] In the traditional sense, the equipment and technology of strip width control are mainly concentrated in the roughing mill. The width control equipment in the rough rolling area is mainly a powerful large vertical roll mill. The control method mainly includes (1) automatic control of t...

AI Technical Summary

Problems solved by technology

[0008] The above three patents are all aimed at adjusting the width of the strip steel, which cannot be combined with the width setting of the rough rolling exit of the process machine. Because the strip width is affected by the natural widening during the hot continuous rolling and finishing rolling process, the inter-stand Due to the influence of various factors such as tension, plate crown change, and rolling temperature change, it is difficult to maintain the consistency of the width of the strip along the entire length direction

The greater the width fluctuation of the strip during the rolling process, the greater the positive deviation value required by the process machine when setting the target width, so as to ensure that the full-length width of the strip is greater than the actual required value of the strip width, and the actual rolling It is also difficult to ensure that the strip width fluctuates around the set value. In this way, the process machine cannot take the precision The influence of rolling automatic width control may make the looper system often in the control state of high tension or low tension, which will affect the stability of the finishing rolling system

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