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Screw down cylinder deviation control method of hot continuous rolling mill

A technology of hot continuous rolling mill and control method, which is applied in the direction of rolling mill control device, metal rolling, metal rolling, etc., which can solve the problems of one-sided single, scrap steel, unable to perform roll gap leveling, etc., and achieve the effect of improving production efficiency

Active Publication Date: 2017-08-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) When the position deviation of one side of the pressing oil cylinder exceeds a certain threshold (for example, 3.5mm), the hot rolling mill automatically locks the pressing oil cylinder, so that the roll gap cannot be leveled, resulting in scrap steel after deviation;
[0006] 2) When the position deviation of one side of the pressing oil cylinder exceeds a certain threshold (for example, 10mm), the hot rolling mill will automatically stop quickly and open the roll gap, resulting in scrap steel
[0007] The commonality of the above problems is that the control conditions for the position deviation of the pressing oil cylinder are one-sided and single, resulting in a large scrap rate

Method used

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  • Screw down cylinder deviation control method of hot continuous rolling mill
  • Screw down cylinder deviation control method of hot continuous rolling mill
  • Screw down cylinder deviation control method of hot continuous rolling mill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] In this embodiment, the PLC system executes the program corresponding to the above-mentioned steps to control the above-mentioned execution system in the frame F1 in the above-mentioned Table 1, and the specific process is:

[0062] (1) Judgment of the frame state: at this moment, the steel strip did not arrive at the specified window (in this embodiment, the vertical roll before the finish rolling). Any value in the threshold value 400-550t has not been reached, so the frame F1 must be in the state of "no steel" at this time, and proceed to step (2b);

[0063] (2b) Static deviation control:

[0064] The PLC system obtains the data measured by the cylinder position sensor when the inlet end of the working side of the frame F1 is depressed at this time through the cylinder position sensor x 1 , The output end of the working side presses down the data measured by the cylinder position sensor x 2 , The data measured by the cylinder position sensor at the inlet end of the...

Embodiment 2

[0072] Summarized in this embodiment, the PLC system executes the program corresponding to the above steps to control the above-mentioned execution system in the frame F2 in the above-mentioned Table 1, and the specific process is:

[0073] (1) Judging the state of the stand: at this moment, the steel strip arrives at the designated window (in this embodiment, it is the finish rolling F1 stand), and the absolute value of the rolling force of the stand F2 is 1852t. Exceeded any value of 400-550t shown in Table 1, so the frame F2 must be in the state of "steel" at this time, and proceed to step (2a);

[0074] (2a) Dynamic deviation control:

[0075] The PLC system uses the cylinder position sensor to obtain the data measured by pressing the cylinder position sensor at the inlet end of the working side of the frame F2 within 20 scan periods j (j=1,2,3...20) within 1 second with a scan period of 50ms x j1 , The output end of the working side presses down the data measured by the...

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Abstract

The invention discloses a screw down cylinder deviation control method of a hot continuous rolling mill. The method comprises the steps of (1) judging whether the state of a rack of the hot continuous rolling mill, implementing the step (2a) if the rack is in the 'with steel' state, and implementing the step (2b) if the rack is in the 'without steel' state; (2a) performing dynamic deviation control, specifically, working out the variance of position deviation of a screw down cylinder, judging whether the variance is larger than the variance threshold value or not and whether theta is larger than alpha or not, if yes, locking the screw down cylinder, and if not, implementing rolling normally; and (2b) performing static deviation control, specifically, working out the position deviation s1 of the screw down cylinder on the working side, the position deviation s2 of the screw down cylinder on the transmission side, and the position deviation S of the portions, on the two sides of the rack, of the screw down cylinder, if S is larger than or equal to beta1, forbidding the rack from feeding steel, if S is smaller than beta1, allowing the rack to feed steel and implementing the next step, if at least one of s1 and s2 is larger than or equal to beta2, locking the screw down cylinder, and if s1 and s2 are both smaller than beta2, implementing rolling normally.

Description

technical field [0001] The invention relates to a deviation control method, in particular to a deviation control method for pressing down an oil cylinder. Background technique [0002] Both sides of the stand (working side and drive side) of a hot rolling mill usually have a press-down cylinder for roll gap leveling. [0003] Due to the large force (usually 3000-5000t) in the rolling process of the hot rolling mill, in order to protect the depression cylinder, the inlet and outlet ports on the working side of the rack and the inlet and outlet ports on the drive side of the rack are currently The outlet end is equipped with a pressure cylinder position sensor to detect the position of the pressure cylinder on both sides of the frame, and set the protection condition of the pressure cylinder according to the position. Specifically: according to the data measured by the pressure cylinder position sensor on one side of the frame (any side of the frame) at the inlet and outlet e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B33/00B21B37/00
CPCB21B33/00B21B37/00
Inventor 荣鸿伟郁华军周兴泽刘运华
Owner BAOSHAN IRON & STEEL CO LTD
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