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High-accuracy automatic thickness control method and equipment based on thickness gauge subsection monitoring

A technology of automatic thickness control and thickness gauge, which is used in rolling mill control devices, metal processing equipment, metal rolling, etc., can solve the problem of large difference in rolling force, restrict thickness accuracy, and can not improve thickness hit rate, etc. question

Inactive Publication Date: 2011-09-07
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Since various errors are difficult to accurately estimate, the real rolling mill stiffness coefficient and the set stiffness in the control system cannot be completely consistent, so there is a large error between the calculated thickness and the actual rolled thickness
The method of some factories in Japan and China is to correct the constant A, but it cannot improve the thickness hit rate very well
Because for a product of a variety and specification, the parameters between each pass are not equal, for example, the rolling force of each pass varies greatly, and the rolling force fluctuation in the same pass is also quite large, which determines the error A cannot be a constant, and the result of using the method of correcting the constant A to solve the problem is not ideal
This is the difficulty of the absolute value thickness gauge type AGC system, which restricts the thickness accuracy of this method

Method used

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  • High-accuracy automatic thickness control method and equipment based on thickness gauge subsection monitoring
  • High-accuracy automatic thickness control method and equipment based on thickness gauge subsection monitoring
  • High-accuracy automatic thickness control method and equipment based on thickness gauge subsection monitoring

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Effect test

Embodiment 1

[0051] Embodiment 1. A kind of automatic thickness control method based on thickness gauge section monitoring:

[0052] see figure 1 and figure 2 , the compensation method includes the following steps:

[0053] 1. Obtain the predicted thickness value h p and take the average of

[0054] During the rolling process, from the beginning of biting the steel to the steel throwing of this pass, calculate the predicted thickness, sample the predicted thickness and calculate the average value, specifically:

[0055] (1) Calculate the predicted thickness value from the process of biting steel in this pass until steel throwing.

[0056] Since the reversing rolling mill is rolled back and forth, and equipped with a thickness gauge, the thickness of the steel plate can only be measured in odd or even passes. The thickness of the steel plate can be measured in the pass of the thickness gauge, from the beginning of the steel bite of the rolling mill until the steel throwing of the ro...

Embodiment 2

[0091] Embodiment 2. Automatic thickness control equipment based on thickness gauge section monitoring:

[0092] The structure of the automatic thickness control device is as follows: figure 2 As shown, it includes a predicted thickness calculation device 13 , a sampling average device, an absolute thickness calculation device and an AGC adjustment device 17 which are sequentially connected by electrical signals.

[0093] The predicted thickness calculation device 13 is a device used to calculate the predicted outlet thickness of the steel plate, which is realized by programming on a programmable logic controller, and which is calculated by the following formula:

[0094] h p = S 0 + p a - p 0 K m - T of ...

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Abstract

The invention discloses a high-accuracy automatic thickness control method and equipment based on thickness gauge subsection monitoring. The method comprises the following steps of: calculating the current predicted thickness value hp in real time from the moment that steel is bitten on a track to the moment that the steel is thrown by a rolling machine, and sampling and acquiring the mean value of hp; sampling and measuring thickness ha from the moment that a steel plate enters into a thickness gauge to the moment that the steel plate leaves from the thickness gauge, and acquiring the mean value of ha; calculating the outlet thickness absolute value hC, n and the subsection outlet thickness absolute value hC, n(i) of the next track according to the difference of the predicted thickness and the measured thickness; and calculating AGC (automatic gain control) regulating variable and subsection AGC regulating variable of the next track. The equipment comprises a predicted thickness calculating device, a sampling average device, an absolute thickness calculating device and an AGC adjusting device which are sequentially connected by virtue of electric signals. The method provided by the invention overcomes the defect of the traditional absolute value-way AGC method, and a thickness gauge subsection monitoring way is adopted to accurately measure errors of a thickness calculating model, thus high-accuracy calculation on the outlet thickness of rolling material is realized, and the thickness control accuracy is improved.

Description

technical field [0001] The present invention relates to a high-precision plate rolling automatic thickness control (AGC) method and its equipment for a reversible hot rolling mill, in particular to a high-precision automatic thickness control method and its equipment based on the segmental monitoring of a thickness gauge . Background technique [0002] In order to improve the longitudinal tolerance of steel plates and increase the hit rate of product thickness, a lot of research has been done on the automatic thickness control system of rolling mills at home and abroad. At present, the thickness gauge type AGC system is generally used in domestic hot plate rolling mills. The main feature of the thickness gauge type AGC system is to use the rolling mill bounce equation to calculate the thickness of the rolled steel plate as the measured thickness, and use the difference between the set thickness and the calculated thickness Calculate the amount of adjustment for depression. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/24
Inventor 陈跃华王利国
Owner WISDRI ENG & RES INC LTD
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