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A control method for the AGC system of the finishing mill of a thin plate hot rolling line

A technology of finishing rolling mill and control method, which is applied in the direction of rolling mill control device, metal rolling, metal rolling, etc., and can solve the problems of low production stability of thin-gauge products, difficult thickness control, and low pass rate of thickness of thick-gauge products. , to solve the instability of production process control and product quality, improve the qualified rate and production stability, and solve the effect of production process control and product quality

Inactive Publication Date: 2017-06-23
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, when rolling strips of all thickness specifications, the adjustment range and adjustment rate of the reduction amount in the AGC control system of each stand of the finishing rolling unit are at a certain value. The outlet thickness of different thickness specifications is not the same, and the outlet thickness of products with different thickness specifications in the finished product stand of the finishing rolling mill is also different, resulting in a low thickness pass rate of thick specification products, insufficient thickness stability of thin specification products, and thin specification products. In the process of stripping, the loopers at the last few stands of the finish rolling unit are severely picked up, and the plate shape between the stands is unstable, which is prone to rolling and rolling accidents, which seriously affects the production stability of thin-gauge products
[0007] Affected by the market environment, enterprises need to organize production according to orders, and organize production in small batches, multiple steel types, and multiple specifications at the same time, introducing new negative factors into the existing AGC control system, making it more difficult to control the thickness of the product, and the thickness jump exceeds the process Standard technical requirements, the pass rate of product thickness is low
After research and analysis, the key point that affects the large thickness deviation of the same strip and the low production stability of thin-gauge products lies in the control method of the AGC control system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] To produce strip steel with a thickness of 2.0 mm, a 7-stand finishing mill is used, and the carbon content (mass percentage) in the strip steel is 0.103% to 0.105%.

[0106] According to the above control method, since 2.0mm is in the range of finished product thickness < 2.1mm, the corresponding adjustment range and adjustment rate are implemented according to the 2.1mm layer standard, specifically: F0, F1, F2, F3, F4, The corresponding adjustment ranges at F5 and F6 racks are: 350 μm, 300 μm, 250 μm, 200 μm, 150 μm, 100 μm, and 80 μm; the corresponding adjustment rates at F0, F1, F2, F3, F4, F5, and F6 racks are: 650μm / s, 600μm / s, 550μm / s, 500μm / s, 450μm / s, 400μm / s, 350μm / s.

[0107] Through the actual verification of an enterprise, strip steel with a thickness of 2.0mm and below can be mass-produced stably, and the average monthly output has increased from 204 tons to 7088 tons, which is 35 times higher than before.

Embodiment 2

[0109] To produce strip steel with a thickness of 2.5 mm, a 7-stand finishing mill is used, and the carbon content (mass percentage) in the strip steel is 0.103% to 0.105%.

[0110] According to the above control method, since 2.5mm is located between the 2.1 layer and the 2.6 layer, the corresponding adjustment range and adjustment rate need to be calculated according to the above formula. After calculation, the results are: the corresponding adjustment ranges at F0, F1, F2, F3, F4, F5, and F6 racks are: 390 μm, 340 μm, 290 μm, 240 μm, 190 μm, 140 μm, 96 μm; F0, F1, F2, F3 , F4, F5, and F6 racks corresponding adjustment rates are: 690μm / s, 640μm / s, 590μm / s, 540μm / s, 490μm / s, 440μm / s, 390μm / s.

[0111] Through the actual verification of an enterprise, the thickness of 2.5mm and below can be mass-produced, and the average monthly output has increased from 5,984 tons to 19,575 tons, which is 3.3 times higher than before.

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Abstract

The invention discloses a control method of a thin plate hot rolling wire finishing mill AGC system. According to the control method, the adjusting amplitude is subdivided according to the different thickness of the finished strip steel and different racks, and the adjusting amplitude is increased when the thickness of the finished strip steel is increased, and is decreased when the sequence number of the rack is increased. Therefore, the control concept that the adjusting amplitude of all finished strip steels at each rack of the finishing mill is a certain value is changed. The linear setting is conducted based on different thickness at each rack outlet of the racks F0, F1...Fn, the control precision of the AGC system is raised; the qualified rates of the strip steels in both thick and thin specification are increased and the production stability is improved. Therefore, the strip steels in smalllot, multi steel types and multi specification can be produced at the same time based on the order, and substantial economic benefit is realized.

Description

technical field [0001] The invention relates to the technical field of steel rolling equipment, in particular to a control method for an AGC system of a thin plate hot rolling line finishing mill. Background technique [0002] At present, the AGC control system is widely used in each stand of the finishing line of the hot continuous rolling coil production line. Through the control of various AGC control systems, the product can reach the required target thickness. The outlet thickness of each stand of the finishing rolling unit gradually approaches the thickness of the finished product from front to back. In order to produce the thickness requirements that meet the order requirements, in addition to the initial roll gap design through load distribution, online adjustment through the AGC control system is also required. , to ensure that the thickness is up to standard. [0003] The basic principle of the AGC system of the finishing mill of the thin plate hot rolling line is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/20B21B37/24
CPCB21B37/20B21B37/24B21B2201/06B21B2261/043
Inventor 王克柱李文王鹏张晶波赵月强赵磊曹金生柴永祥
Owner SHANDONG IRON & STEEL CO LTD
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