Steel strip tail deviation control method

A control method and strip steel technology, applied in the direction of tail end control, rolling force/roll gap control, etc., can solve the problems of short time passing through the rolling mill, delayed disposal time, fast steel throwing speed, etc., and achieve good control effect, Effect of accidental roll drop

Active Publication Date: 2012-07-18
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Steel strip tail deviation control method
  • Steel strip tail deviation control method
  • Steel strip tail deviation control method

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Experimental program
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Embodiment Construction

[0047] In this embodiment, taking the finishing mill of the 2050 hot rolling production line used by the inventor as an example, the target thickness of the finished product frame h=2.5mm, the target width of the finished frame w=1173mm, and the target final rolling temperature ft=860°C For strip steel, the rolling mill stiffness coefficient is 1.67um / t. as per figure 2 The flow shown for the F 7 Rack to adjust:

[0048] (1) start;

[0049] (2)F 6 The rolling mill throws steel, and the pressure sensor measures F at this time 7 The rolling force deviation on both sides of the work roll of the rolling mill is 0t, so it is locked as ΔF (DS-OS)LockOn ;

[0050] (3) Judging whether the delay time reaches 30ms, after the delay time reaches the set 30ms, F 7 Rolling mill automatic leveling system put into control;

[0051] (4) According to the F measured in real time by the pressure sensor 7 The rolling force value on both sides of the work roll of the rolling mill, we know...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/72B21B37/58
Inventor 朱蔚林张仁其幸利军
Owner BAOSHAN IRON & STEEL CO LTD
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