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Dynamic soft reduction method for detecting tail end of solidified liquid core of casting blank based on pressure feedback

A technology of feedback detection and solidification end, applied in the field of metallurgical continuous casting control, can solve the problems of lack of direct detection basis and verification, large relationship between model quality and complex calculation methods, etc., to ensure stability and execution efficiency, and save computer resources , The algorithm is simple and effective

Inactive Publication Date: 2010-12-22
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this technology are: since the end position of the solidified liquid core is obtained by theoretical calculation, it has a great relationship with the quality of the model used in the calculation, the calculation method is also complicated, and the calculation time is long; and it lacks direct detection basis and verification is difficult
However, the actual production process is more complicated due to many influencing factors, resulting in poor accuracy of the predicted position of the end of the solidified liquid core, resulting in poor stability of the control effect

Method used

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  • Dynamic soft reduction method for detecting tail end of solidified liquid core of casting blank based on pressure feedback
  • Dynamic soft reduction method for detecting tail end of solidified liquid core of casting blank based on pressure feedback
  • Dynamic soft reduction method for detecting tail end of solidified liquid core of casting blank based on pressure feedback

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Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1, slab continuous casting machine, section 1800×230, casting machine structure: No. 0 is the foot roll section, a total of 1-10 sector sections. Casting steel type: Q235A. There are 14 consecutive casting furnaces in total, and the fourth furnace is selected. The tundish temperature is 1544°C and the casting speed is 0.90-0.95m / min. In the dynamic steel casting mode under light pressure, the pressure on the slab in the No. 5 sector was detected to be 50t, the fluctuation amplitude was 2-14t, the roll gap was lifted and pressed down by 0.3mm, and the slab feedback pressure change curve was The slope range is between 0.40-0.75; the pressure on the slab in the No. 6 segment is 68, the fluctuation amplitude is 0-5t, and the slope range of the change curve is between 0.75-1.00. The pressure on the slab in No. 7 sector and No. 8 sector is 85t, the fluctuation amplitude is 0-5.5t, and the slope of the change curve is in the range of 0.9-1.0. Therefore, it is judge...

Embodiment 2

[0030]Embodiment 2, slab continuous casting machine, cross section 1800×230, casting machine structure: No. 0 is the foot roll section, a total of 1-10 sector sections. Casting steel type: Q345B. The number of continuous casting furnaces is 8 furnaces. The third furnace is selected. The tundish temperature is 1542°C and the casting speed is 0.85-0.90m / min. In the mode of steel pouring under dynamic light pressure, the pressure on the casting slab in the No. 6 sector was detected to be 60t, the fluctuation amplitude was 2-15t, the roll gap was raised and lowered by 0.3mm, and the pressure change curve of the slab was fed back. The slope range is between 0.45-0.70; the pressure on the slab in the No. 7 segment is 75, the fluctuation amplitude is 0-5t, and the slope range of the change curve is between 0.85-1.00. The pressure on the slab in No. 8 segment is 80t, the fluctuation amplitude is 0-5.5t, and the slope of the change curve is in the range of 0.9-1.0. Therefore, it is ju...

Embodiment 3

[0031] Embodiment 3, slab continuous casting machine, cross section 1800×230, casting machine structure: No. 0 is the foot roll section, a total of 1-10 sector sections. Casting steel type: A32, 9 continuous casting furnaces in total, the fifth furnace is selected, the tundish temperature is 1546°C, and the casting speed is 0.85-0.9m / min. In the dynamic steel pouring mode under light pressure, the pressure on the slab in the No. 7 sector was detected to be 75t, the fluctuation amplitude was 1-14t, the roll gap was lifted and pressed down by 0.3mm, and the slab feedback pressure change curve was The slope range is between 0.40-0.60; the pressure on the slab in No. 8 segment is 70, the fluctuation amplitude is 0-7t, and the slope range of the change curve is between 0.80-0.90. The pressure on the slab in No. 9 segment is 77t, the fluctuation amplitude is 0-4.5t, and the slope of the change curve is in the range of 0.85-1.00. Therefore, it is judged that the solidification end o...

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Abstract

The invention relates to a dynamic soft reduction method for detecting the tail end of a solidified liquid core of a casting blank based on pressure feedback, belonging to the technical field of metallurgy continuous casting control. The method comprises the following steps of: firstly, establishing a control platform for remotely and automatically adjusting roll gaps of all sector sections on a continuous casting machine, and calculating the stress of the casting blank in different sector sections by utilizing the detection result of pressure sensors installed on all the sector sections; detecting the stress difference of the casting blank in each sector section during roll gap variation by changing the roll gap contraction size of each sector section; judging the position of the tail end of the solidified liquid core of the casting blank according to the stress difference between the casting blank with the liquid core and the casting blank without the liquid core; and finally, dynamically adopting different reduction quantities in all sector sections of a casting machine by using a soft reduction control system according to the position of the tail end of the liquid core judged by the method. The method for judging the tail end of the solidified liquid core of the casting blank is directly obtained by calculating the real-time stress of the casting blank. Because the calculation of casting blank surface temperature and blank shell thickness does not need a large quantity of mathematical models, the calculation method is simple and effective and ensures the stability and the execution efficiency of a casting machine control system.

Description

Technical field: [0001] The invention relates to a dynamic soft reduction method for detecting the end of a slab solidified liquid core based on pressure feedback, and belongs to the technical field of metallurgical continuous casting control. Background technique: [0002] In the continuous casting production process, high-temperature liquid steel is continuously cast and solidified in equipment consisting of molds and segments to form a slab with a liquid core of a certain thickness. The liquid core is continuously cooled and solidified to finally form a solid slab. Due to the solidification shrinkage of molten steel during the solidification process, the mold has a certain taper; at the same time, the roll gap of the fan section is designed in the form of continuous shrinkage to compensate for the solidification shrinkage. If the compensation shrinkage is inconsistent with the actual solidification shrinkage, especially If the liquid core shrinkage at the end of solidific...

Claims

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Application Information

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IPC IPC(8): B22D11/16
Inventor 李贵阳彭兆丰张晓力许斌胡志刚邓建军唐恒国李金波范佳
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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