Thickness control method and device for hot-rolled strip steel and terminal equipment

A technology for thickness control and hot-rolled strip, applied in rolling mill control devices, rolling force/roll gap control, metal rolling, etc. , The automatic control system is not fully invested, etc., to reduce the fluctuation and eliminate the phenomenon of lack of expansion and thick jump.

Inactive Publication Date: 2021-05-28
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if the thickness control system imported from abroad, the automatic control system is not fully put into use in actual use.
At the same time, since the thickness of the strip is jointly affected by the hydraulic servo system, the automatic control system, the instantaneous conditions of the process, and the random changes in raw materials, the automatic thickness control system (AGC) has uncertainty, and it is difficult to reduce the thickness of the finished strip. thickness fluctuation

Method used

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  • Thickness control method and device for hot-rolled strip steel and terminal equipment
  • Thickness control method and device for hot-rolled strip steel and terminal equipment
  • Thickness control method and device for hot-rolled strip steel and terminal equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] In this example, the rolling process includes heating, rough rolling, and finish rolling. The example brand is Z-DD12-C-SFL--4.99*1250mm. The blank is pickled plate, the thickness compensation is 0.06mm, and the target thickness is 5.05mm . Specific steps are as follows:

[0127] (1) Heating process: the temperature of the billet leaving the heating furnace is 1197°C, the sum of the heating time of the second heating section and the soaking section is 84 minutes, and the temperature difference of the billet passing through the plate is 16°C.

[0128] (2) Rough rolling process: There is no water leakage in the frame, the cooling water pressure of the work roll is 13 bar, and the flow rate is 80%. 5 passes of rolling are adopted, the temperature of the final pass (RT5) is 1003°C, and the thickness of the billet of the final pass is 34mm.

[0129] (3) Finish rolling process: there is no water leakage in the frame, if the cooling water valve on the surface of the F2 strip...

Embodiment 2

[0135] In this embodiment, the rolling process includes heating, rough rolling, and finish rolling processes. The example designation is DD11-MD, and the target thickness is 3.0mm. The specific process steps are as follows:

[0136] (1) Heating process: the temperature of the billet leaving the heating furnace is 1205°C, the sum of the heating time of the second heating section and the soaking section is 82 minutes, and the temperature difference of the billet passing through the plate is 19°C.

[0137] (2) Rough rolling process: There is no water leakage in the frame, the cooling water pressure of the work roll is 13 bar, and the flow rate is 80%. 5 passes of rolling are adopted, the temperature of the final pass (RT5) is 1017°C, and the thickness of the billet in the final pass is 34mm.

[0138] (3) Finish rolling process: there is no water leakage in the frame, the cooling water pressure of the work roll is 13 bar, the flow rate F1-F4 is 80%, and the flow rate F5-F7 is 70%....

Embodiment 3

[0144] In this embodiment, the rolling process includes heating, rough rolling, and finish rolling processes. The example grade is C600XT, and the target thickness is 1.50 mm. The specific process steps are as follows:

[0145] (1) Heating process: the temperature of the billet leaving the heating furnace is 1271°C, the sum of the heating time of the second heating section and the soaking section is 89 minutes, and the temperature difference of the billet passing through the plate is 17°C.

[0146] (2) Rough rolling process: There is no water leakage in the frame, the cooling water pressure of the work roll is 13 bar, and the flow rate is 85%. 5 passes of rolling are adopted, the temperature of the final pass (RT5) is 1107°C, and the thickness of the billet of the final pass is 32mm.

[0147] (3) Finish rolling process: There is no water leakage in the frame, the cooling water pressure of the work roll is 13 bar, the flow rate F1-F4 is 85%, and the flow rate F5-F7 is 75%.

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Abstract

The invention provides a thickness control method for hot-rolled strip steel. The thickness control method comprises the following steps of acquiring blank thickness information, blank plasticity coefficient information and target thickness information, generating an initial rolling force signal according to the blank thickness information, the blank plasticity coefficient information and the target thickness information, obtaining a rolling force measured value of a roller, performing rolling force eccentric compensation according to the rolling force measured value, obtaining the blank tail outlet thickness of each rack of a rolling mill and the blank conveying time from a previous rack of each rack to the racks, and performing rolling force tail compensation on each rack according to the blank tail outlet thickness and the blank conveying time. According to the characteristics of raw materials and a rolling system in the rolling process, rolling signals are optimized, the rolling signals are prevented from being influenced by roller eccentricity through eccentricity compensation, the phenomena of tension loss and thickness jump are eliminated through tail compensation, and fluctuation of the thickness of a finished steel belt can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of hot rolling, and in particular relates to a method, device and terminal equipment for controlling the thickness of hot-rolled strip steel. Background technique [0002] Thickness accuracy is one of the two major quality indicators of strip steel, and thickness control is one of the two key technologies in the field of strip rolling. [0003] With the increasingly fierce competition in the iron and steel industry, high quality, high output, high yield and low cost have become the necessary conditions for the survival of modern iron and steel enterprises. This requires enterprises to use advanced technology, advanced equipment, and advanced control strategies to improve the control system. Although the plate thickness control technology in our country has been used for many years, it should be seen that because the rolling mill reduction control technology has integrated the knowledge of many disciplines, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/18B21B37/66
CPCB21B37/18B21B37/66B21B2201/06
Inventor 白君李洋郝占全张瑞波高茂林杨海峰罗波连庆
Owner HEBEI IRON AND STEEL
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