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A control method based on AGC system to reduce thickness deviation of steel plate head and tail

A control method and technology for steel plates, applied in the field of steel plate rolling, can solve the problems of difficulty in controlling the thickness deviation of the head and tail, and achieve the effect of scientificity and good compensation effect.

Active Publication Date: 2022-02-01
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the head and tail thickness deviation is difficult to control in the current wide and thick plate rolling, and to provide a control method based on the AGC system to reduce the thickness deviation of the head and tail of the steel plate

Method used

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  • A control method based on AGC system to reduce thickness deviation of steel plate head and tail
  • A control method based on AGC system to reduce thickness deviation of steel plate head and tail
  • A control method based on AGC system to reduce thickness deviation of steel plate head and tail

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Embodiment 1

[0020] This embodiment is a control method based on the AGC system to reduce the thickness deviation of the head and tail of the steel plate. Specifically, the Q235 steel plate with a thickness of 40mm is rolled. The thickness of the head and tail is obviously thinner within the length range of 0-800mm;

[0021] In this embodiment, the original fixed-value head compensation program for each pass is deleted in the first-level control system, and a new dynamic head compensation program is added. The head compensation value H is limited to 0.3mm<H<1.5mm, and through two Calculate the actual rolling length of the steel plate head at the first stage, judge that L1=300mm, H is zero through the slope controller, and K=0.58 through linear regression measurement.

[0022] Set the delay of 100ms to start the AGC compensation when the steel plate head bites into the rolling mill. Through conditional chaining and logical judgment, the AGC compensation value Wagc correction coefficient of ...

Embodiment 2

[0025] This embodiment specifically rolls a 20mm thick Q355N steel plate, which belongs to the category of temperature-controlled rolling and thin-gauge steel plates, and the thickness in the length range of 300-800mm from the head to the tail is obviously thinner after rolling by conventional compensation methods;

[0026] In this embodiment, the original fixed-value head compensation program for each pass is deleted in the first-level control system, and a new dynamic head compensation program is added. The head compensation value H is limited to 0.3mm<H<1.5mm, and through two Calculate the actual rolling length of the steel plate head at the first stage, judge that L1=300mm, H is zero through the slope controller, and K=0.58 through linear regression measurement.

[0027] It is set to delay 300ms to start AGC compensation when the steel plate head bites into the rolling mill. Through conditional chaining and logical judgment, the AGC compensation value Wagc correction coeffi...

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Abstract

The present invention is a control method based on the AGC system to reduce the thickness deviation of the head and tail of the steel plate, which includes the following steps: 1) AGC compensation is performed on the steel plate for the last rolling pass, and the compensation start timing is divided into the following two types according to the type of steel plate Type: For thick non-temperature-controlled rolling steel plates, when the steel plate head bites into the rolling mill and delays 50ms‑100ms or when Fx / Fw> 65%, AGC compensation is started; for temperature-controlled rolling and thin gauge steel plates, when the steel plate head AGC compensation is started when the delay is 300ms and Fx / Fw>95% after the part bites into the rolling mill; where Fx represents the actual rolling force, and Fw is the set rolling force; 2) The AGC compensation value Wagc in step 1) is corrected, Compensation value W1=K1×Wagc for thick non-temperature-controlled rolling steel plate, W2=K2×Wagc for temperature-controlled rolling and thin steel plate, where K1=Cm / (Cm+Cg)+|(Fx ‑Fw) / Fw|+1, K2=Cm / (Cm+Cg)+|(Fx‑Fw) / Fw|; where Cm is the material plasticity coefficient, and Cg is the rolling mill bounce coefficient; the present invention effectively solves the problem of steel plate head and tail The problem of thin thickness. Cm / (Cm+Cg)+|(Fx‑Fw) / Fw|+1.

Description

technical field [0001] The invention relates to the technical field of steel plate rolling, in particular to a control method based on an AGC system for reducing thickness deviation at the head and tail of a steel plate. Background technique [0002] As the main technical index of product thickness, the vertical difference of the steel plate directly affects the negative tolerance rolling of the steel plate and the control level of the cutting head and tail length in the production process. Due to the rapid temperature drop at the head and tail of the steel plate, the plastic deformation is poor; after the steel plate is bitten into the rolling mill, the oil column of the HGC cylinder retracts and the thickness of the oil film is affected by the low-speed biting steel. Before biting, add the head feed-forward compensation method in the first-level control system, that is: before the steel plate bites, adjust the position of the HGC to reduce the fixed roll gap, and restore t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/16
CPCB21B37/16
Inventor 熊艳严明王成杨波
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD