Method for controlling width deviation of head and tail of hot rolled strip

Abstract

The invention discloses a method for controlling the width deviation of a head and a tail of a hot rolled strip. The method comprises the following steps that when the head of the hot rolled strip narrows, vertical rolls of a rolling mill are controlled to be opened in the roll gap to perform side compression on the hot rolled strip according to the track of short stroke curves of the hot rolled strip head; when the tail of the hot rolled strip narrows, the vertical rolls of the rolling mill are controlled to be opened in the roll gap to perform side compression on the hot rolled strip according to the track of the first short stroke curves of the hot rolled strip tail; and when the tail of the hot rolled strip is beyond the width, the vertical rolls of the rolling mill are controlled to be narrowed in the roll gap to perform side compression on the hot rolled strip according to the track of the second short stroke curves of the hot rolled strip tail. By the adoption of the control method disclosed by the invention, the problem of over width of the tail of the hot rolled strip is effectively solved, and equipment damage caused by over width of width of the hot rolled strip is basically avoided; and in addition, the stability of control aiming to the narrowing of the head and the tail of the hot rolled strip is also enhanced, and the quality of the hot rolled strip and the yield of the hot rolled strip are greatly enhanced.

Description

technical field [0001] The invention relates to a strip rolling control method, in particular to a method for controlling the width of the head and tail of a hot-rolled strip. Background technique [0002] In the strip rolling process, the hot-rolled strip will cause the strip head to appear such as figure 1 The "tongue shape" 1 shown, and the tail of the strip will appear in the process of side pressing of the vertical roll as figure 1 The "fishtail" 2 shown. The appearance of "tongue" 1 or "fishtail" 2 at the head and tail of the strip will affect the stability of production and the yield of metal. Therefore, the head and tail shape control of hot-rolled strip is one of the important topics of continuous research on hot-rolled technology. [0003] In order to control the "tongue" and "fishtail" of the hot-rolled strip, the control method adopted in the prior art is to use the "short stroke" function in the strip side pressing process. that is, figure 2 As shown, acco...

AI Technical Summary

Problems solved by technology

However, in the process of rolling thin strip steel with high tension in the continuous rolling stand, the overall width is easily narrowed, so this is compensated in the width control strategy, and there is a loss of tension when the continuous rolling stand rolls to the end of the strip Therefore, there will be a loss of width at the tail of the strip, which will affect the control of the width accuracy of hot rolling, cause abnormal wear of the finish rolling side guide plate and the coiling side guide plate, and also cause quality defects such as hemming and iron sticking at the tail of the coil

[0009] To sum up, the existing "short stroke" control model cannot eliminate the loss of width caused by the loss of tension at the tail of the strip

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