Steel strip tail deviation control method

Abstract

The invention discloses a steel strip tail deviation control method, which includes: locking the rolling force deviation of an Fx rolling mill and setting the same as the automatic leveling target for the next roll after steel blasting of an Fx-1 or Fx-2 rolling mill; judging whether the deviation of rolling force of two sides of the Fx rolling milling within the nth sampling cycle by an automatic leveling system of the Fx rolling mill varies or not, and determining that the steel strip deviates if the rolling force deviation varies; computing the leveling amount of the nth sampling cycle by the automatic leveling system for the Fx rolling mill and judging whether the leveling amount exceeds the maximum limit value of the Fx rolling mill or not; raising or pressing transmission side roll gap according to the maximum limit value of the Fx rolling mill if the leveling amount exceeds the maximum limit value; and raising or pressing the transmission side roll gap according to the leveling amount if the leveling amount does not exceed the maximum limit value.

Description

technical field [0001] The invention relates to a strip steel rolling control method, in particular to a method for controlling strip steel tail deviation. Background technique [0002] The tail of hot-rolled strip steel is a complex process of technological change. Due to the limitations of current technology in each process, an absolutely ideal rolled piece does not exist. Even if the strips are of the same variety and specification, there are certain differences in some aspects, including: tail temperature difference, tail thickness difference, tail plate shape difference and so on. The time for the tail of the strip to pass through the finishing mill is very short, and the time left for the control system to control is very limited (only 0.4 seconds in the shortest time), so it is difficult to find a method for automatically controlling deviation and rolling. [0003] Therefore, at present, the deviation of the tail of the strip depends on the manual control of the oper...

AI Technical Summary

Problems solved by technology

[0005] 1. It is almost impossible to detect the deviation of the strip in the early stage of the deviation by relying on the naked eye, which delays the disposal time;

[0006] 2. Due to the high speed of steel throwing, the time for the tail of the strip to pass through the rolling mill is very short, and the response time completely relying on manual control is insufficient;

[0007] 3. Since the strip shape and temperature often change, pre-leveling based on the previous strip will lead to misjudgment

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