Adjusting method of slab caster roll gap under unsteady state pouring condition

A technology of slab continuous casting machine and adjustment method, which is applied in the field of continuous casting production technology, can solve problems such as cracks in the middle of the slab, stagnation of the slab, and increased resistance to casting slab, so as to avoid excessive strain of the slab, reduce degradation or Waste, the effect of avoiding sudden changes in the roll gap

Active Publication Date: 2015-11-18
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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Problems solved by technology

[0003] In order to ensure the stable quality of slabs, the constant drawing rate of the continuous casting machine and the unsteady pouring ratio have become important issues in production. Various reasons such as early warning and equipment failure make the pouring process in an unsteady state. At this time, in order to ensure the stability of production and the quality of the slab, it is necessary to change the roll gap operation. Accidents such as stagnant slabs and poor internal quality of slabs
[0004] The traditional dynamic soft reduction roll gap control scheme is based on setting the basic roll gap, subtracting the total target reduction calculated by light reduction before subtracting this position is the actual target roll gap, and the sector section control system directly executes the target ro

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  • Adjusting method of slab caster roll gap under unsteady state pouring condition

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Embodiment Construction

[0022] The present invention is a method for adjusting the roll gap of a slab continuous casting machine under unsteady pouring conditions, comprising the following steps:

[0023] (1) At least 2 incremental encoders are installed on different segment drive motors, which are used to calculate the length of the billet during the pouring stage and the length of the tail billet during the stage of drawing the tail billet;

[0024] (2) Set the safety roll gap as the thickness of the upper mouth of the crystallizer;

[0025] (3) Set the static roll gap as the free shrinkage roll gap value when dynamic light reduction is not used;

[0026] (4) Set the roll gap change rate to 0.02mm / s-0.04mm / s;

[0027] (5) In the mode of pouring preparation, dummy bar delivery, and pouring stop, set the target roll gap value as the safe roll gap value in step (2);

[0028] (6) In the pouring stage, the length of the billet is calculated by one of the encoders installed on the drive motor of the se...

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Abstract

The invention relates to an adjusting method of a slab caster roll gap under the unsteady state pouring condition, and belongs to the technical field of the continuous casting production technology. Firstly, a safety roll gap, a static roll gap and the roll gap changing rate is set, and a target roll gap obtained before casting is a safety roll gap value; at the pouring and tail blank throwing stage, target roll gap values are set according to different blank throwing lengths and different tail blank lengths; when the difference between the set roll gap value and the target roll gap value exceeds +/-0.1 mm, the set roll gap value is changed to the target roll gap value with the roll gap changing rate; when the difference between the actual rolling reduction and the target rolling reduction exceeds +/-0.1 mm, the actual rolling reduction is changed to the target rolling reduction with the roll gap changing rate; and a PLC system executes the set roll gap value, and the difference between the actual roll gap value and the set roll gap value is within +/-0.1 mm through feedback adjustment of a displacement sensor. The durable and stable transition of the actual roll gap and equipment loads is guaranteed, degradation or waste caused by the poor center quality of a casting blank at the unsteady state stage is reduced, and blank lagging accidents are avoided.

Description

technical field [0001] The invention relates to a method for adjusting the roll gap of a slab continuous casting machine under unsteady pouring conditions, belonging to the technical field of continuous casting production technology. Background technique [0002] The dynamic soft reduction technology has been widely used in most slab continuous casting machines in China. The dynamic soft reduction is to calculate the solidification end of the slab through the heat transfer model, and to change the roll gap of the fan section within a certain range of solid phase ratio. A certain amount of reduction is applied to the slab, on the one hand to eliminate the porosity caused by solidification shrinkage, and on the other hand to promote the diffusion and redistribution of high-concentration solutes, so as to achieve the purpose of improving central porosity and central segregation. [0003] In order to ensure the stable quality of slabs, the constant drawing rate of the continuous...

Claims

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Application Information

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IPC IPC(8): B22D11/16
Inventor 邓建军周素强马静超成旭东许红玉王彦杰杨之俊范佳
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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