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Roll gap control method for continuous casting machine by adopting stress as control target

A technology of control target and control method, which is applied in the field of continuous casting in the metallurgical industry, can solve problems such as unstable billet quality, displacement sensor drift, and production equipment damage, and achieve the goals of improving internal quality, solving displacement sensor drift, and reducing roll consumption Effect

Inactive Publication Date: 2012-07-25
HEBEI IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems in the above method are: (1) displacement sensor drift problem
Therefore, due to the drift of the displacement sensor caused by the force deformation of the segment, the displayed roll gap value deviates from the actual value, resulting in unstable casting quality. This is a technical problem that is difficult to solve with traditional roll gap control technology
(2) High hazards that may be caused by equipment failure
Due to the poor working environment of the displacement sensor (including the communication line of the sensor), once the displacement sensor (including its communication system) fails, the roll gap control of the casting machine will deviate from the target, resulting in bulging of the billet, and even leakage. Continuous casting production accidents such as steel and sluggish billets have a great impact on production and damage to equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Slab continuous casting machine, section 1800mm×230mm, casting machine structure: No. 0 is the foot roll section, a total of 1-10 sector sections. Casting steel type: Q235A, continuous casting number: 20100237, 17 continuous casting furnaces in total, the fourth furnace is selected, furnace number: 90502269, tundish temperature 1543°C, casting speed 0.90-0.95m / min. The force target range of the No. 1-4 segments in the liquid phase area is set to 50-60t, the force target range of the No. 5 and No. 6 segments in the straightening area is set to 60-80t, and the No. 7 and No. The force target range of the segment is set at 90-100t, and the force target range of the No. 9 and No. 10 sectors in the solid phase area is set at 30t. Control effect: four slabs were sampled from this furnace for pickling inspection. Three of the slabs were segregated inside, three of which were class C 1.5, and one was class C 2.0.

Embodiment 2

[0021] Embodiment 2: slab continuous casting machine, section 1800mm×230mm, casting machine structure: No. 0 is the foot roll section, a total of 1-10 sector sections. Casting steel type: Q345B, continuous casting number: 20100760, 16 continuous casting furnaces in total, select the third furnace, furnace number: 90401347, tundish temperature 1541°C, casting speed 0.85-0.90m / min. The force target range of the No. 1-4 segment in the liquid phase area is set to 40-50t, the force target range of the No. 5 and No. 6 segments in the straightening area is set to 50-80t, and the 7-9 segment in the solidification area The force target range of the segment is set at 90-120t, and the force target range of the No. 10 segment in the solid phase area is set at 40t. Control effect: five slabs were sampled for this heat, and pickling inspection was carried out. Four slabs were segregated inside the slab, among which four were class C 1.0, and one was class C 1.5.

Embodiment 3

[0022] Embodiment 3: slab continuous casting machine, section 1800mm×230mm, casting machine structure: No. 0 is the foot roll section, a total of 1-10 sector sections. Casting steel type: A36, continuous casting number: 20091985, 9 furnaces in total, the 8th furnace was selected, furnace number: 90807663, tundish temperature 1546°C, casting speed 0.85-0.9m / min. The force target range of the No. 1-4 segment in the liquid phase area is set to 50-60t, the force target range of the No. 5 and No. 6 segments in the straightening area is set to 60-90t, and the 7-9 segment in the solidification area The force target range of the segment is set at 110-150t, and the force target range of the No. 10 segment in the solid phase area is set at 30t. Control effect: five slabs were sampled for this heat, and pickling inspection was carried out. Two of the slab internal segregation grades were Class C 1.0, and three were Class C 0.5.

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Abstract

The invention relates to a roll gap control method for a continuous casting machine by adopting stress as a control target, which belongs to the technical field of continuous casting in the metallurgy industry. The technical scheme includes that pressure sensors arranged in segments are used for detecting the stress of the segments, the roll gap of the continuous casting machine is controlled by adopting the stress of each segment as the control target, the stress target value of each segment is set before steel casting, the segment contracts the roll gap when a practical stress value is smaller than the target value during steel casting, and the segment releases the roll gap when the practical stress value is larger than the target value during steel casting. The roll gap control method has the advantages that the method solves the problems of drifting of a displacement sensor and the like which cannot be solved by a traditional roll gap control method adopting displacement as a control target, the internal quality of a casting blank is obviously improved, quality defects such as loosening, segregation and the like are decreased, the quality stability of the casting blank is improved, segregation and loosening of the casting blank can be completely controlled within C-type 2.0, and roll consumption of the segments can be reduced by about 50%.

Description

technical field [0001] The invention relates to a method for controlling the roll gap of a continuous casting machine with force as the control target, and belongs to the technical field of continuous casting in the metallurgical industry. Background technique [0002] In the continuous casting production process, high-temperature liquid steel is continuously solidified in a device consisting of a crystallizer and multiple segments (generally, a casting machine has 10-16 segments) to form a billet with a liquid core of a certain length. The liquid core cools and solidifies continuously, eventually forming a solid slab. During the steel pouring process, the fan-shaped segments support, guide and pull the slab. Since the molten steel solidifies and shrinks during the continuous casting process, the roll gap formed by multiple fan-shaped segments needs to be designed to continuously shrink the taper. To compensate for the solidification shrinkage of the slab. If the fan-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16B22D11/18
Inventor 王义芳张晓力胡志刚
Owner HEBEI IRON & STEEL GRP
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