KR20160138705A - Apparatus and method for manufacturing slab - Google Patents

Apparatus and method for manufacturing slab Download PDF

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Publication number
KR20160138705A
KR20160138705A KR1020150072893A KR20150072893A KR20160138705A KR 20160138705 A KR20160138705 A KR 20160138705A KR 1020150072893 A KR1020150072893 A KR 1020150072893A KR 20150072893 A KR20150072893 A KR 20150072893A KR 20160138705 A KR20160138705 A KR 20160138705A
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South Korea
Prior art keywords
duty
possibility
slab
free
crystallization temperature
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KR1020150072893A
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Korean (ko)
Inventor
장필용
김기덕
유석현
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현대제철 주식회사
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Priority to KR1020150072893A priority Critical patent/KR20160138705A/en
Publication of KR20160138705A publication Critical patent/KR20160138705A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Factory Administration (AREA)

Abstract

The present invention relates to a slab manufacturing apparatus and a slab manufacturing method, and more particularly, to a slab manufacturing apparatus and method, which includes a main speed measuring unit for measuring a peripheral speed of a mold, an input unit for receiving a crystallization temperature of the mold powder, And a controller for predicting the possibility of occurrence of cracks due to the duty-free period and determining a post-process in which the slab is inserted according to the possibility of cracking due to the predicted duty-free period.

Description

[0001] APPARATUS AND METHOD FOR MANUFACTURING SLAB [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for manufacturing a slab, and more particularly, to a slab manufacturing apparatus and method for predicting the possibility of cracking due to duty-free and controlling a post-process.

Generally, steel manufacturing process is to burn iron coke through burning process to produce pig iron by making steel iron, and to reduce impurities such as carbon contained in pig iron through steelmaking process to produce semi-finished product with high purity, Is finished with a final product such as a wire rod, a coil or a thin plate.

Among them, the steelmaking process is a continuous casting (casting) process in which molten steel, which is made of molten pig iron, is injected into a mold and continuously cooled to produce semi-finished slabs, blooms, billets, .

Meanwhile, the background art of the present invention is disclosed in Korean Patent Laid-open Publication No. 10-2015-0001321 (May 2015.01.06).

The present invention provides a slab manufacturing apparatus and method capable of reducing the time and cost required for a process by predicting the possibility of occurrence of cracks due to a duty free period that may occur in continuous casting.

According to one aspect of the present invention, there is provided a slab manufacturing apparatus comprising: a main speed measuring unit for measuring a peripheral speed of a mold; An input part for receiving the crystallization temperature of the mold powder; And a control unit for predicting a possibility of occurrence of cracks due to the duty-free cycle based on the measured peripheral velocity and the crystallization temperature of the mold powder, and determining a post- And a control unit.

In the present invention, the control unit may apply the slab to the surface grinding process if the possibility of cracking by the duty-free process is more than a reference value, and if the possibility of cracking is less than the reference value, the slab is put into the rolling process do.

In the present invention, the control unit calculates a crack index by duty-free and predicts the possibility of cracking due to the tax exemption, and the crack index is calculated by the following equation (1).

In the present invention, the controller estimates the possibility of cracking by the duty-free only when the crystallization temperature of the mold powder is within a predetermined reference range.

According to an aspect of the present invention, there is provided a method of manufacturing a slab, including: measuring a peripheral velocity in a mold; Receiving the crystallization temperature of the mold powder; Predicting the possibility of occurrence of cracks by duty-free based on the change in the peripheral speed according to the measured circumferential speed and the crystallization temperature of the mold powder; And a step of the control unit determining a post-process in which the slab is inserted according to the possibility of cracking due to the predicted duty-free period.

In the step of determining the post-process after the slab is charged, the control unit determines the surface finishing step as the post-process if the possibility of cracking by the duty-free process is more than the reference value, And if it is less than the reference value, the rolling process is determined as the post-process.

The apparatus and method for manufacturing a slab according to one aspect of the present invention predicts the possibility of cracking due to duty-free based on the change in peripheral speed and the crystallization temperature of the mold powder, It is possible to prevent the unnecessary process from being carried out, and it is possible to reduce the time and cost required for manufacturing the slab.

1 is a block diagram showing the construction of a slab manufacturing apparatus according to an embodiment of the present invention.
2 is a graph for explaining the crack index by duty-free calculation calculated in the slab manufacturing apparatus according to an embodiment of the present invention.
3 is a flowchart illustrating a slab manufacturing method according to an embodiment of the present invention.

Hereinafter, an embodiment of a slab manufacturing apparatus and method according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is a block diagram showing the construction of a slab manufacturing apparatus according to an embodiment of the present invention. FIG. 2 is a graph for explaining a crack index by duty-free calculation calculated in a slab manufacturing apparatus according to an embodiment of the present invention The slab manufacturing apparatus according to the present embodiment will be described as follows.

1, the apparatus for manufacturing slabs according to an embodiment of the present invention includes a control unit 100, a peripheral speed measuring unit 110, and an input unit 120. [

The peripheral speed measuring unit 110 can measure the peripheral speed of the mold. For example, the peripheral speed measuring unit 110 may measure the speed of the roll of the segment at the peripheral speed of the mold.

The input unit 120 can receive the crystallization temperature of the mold powder. For example, the input unit 120 may receive the crystallization temperature of the mold powder from the host controller.

The control unit 100 can estimate the possibility of cracking due to the duty-free operation based on the change in the main speed according to the measured main speed through the main speed measuring unit 110 and the crystallization temperature of the mold powder inputted through the input unit 120. [

That is, during continuous casting, cracks may occur due to the non-uniform solidification in the mold and the long-side portion of the slab, which is in parallel with the casting direction. Such coagulation nonuniformity is mainly influenced by heat flux, and in particular, when the heat flux fluctuates, the possibility of occurrence of crack due to exemption may increase. Since the heat flux can be varied according to the casting speed and the crystallization temperature of the mold powder used in the continuous casting process, the control unit 100 can predict the possibility of cracking due to the duty-free operation based on the peripheral speed and the crystallization temperature of the mold powder.

Generally, when the crystallization temperature of the mold powder changes during the continuous casting, it often does not occur. However, the casting speed is often changed due to various reasons such as clogging of nozzles and problems during the operation. Therefore, the control unit 100 can predict the possibility of cracking due to the duty-free operation based on the peripheral speed fluctuation instead of the peripheral speed itself.

At this time, the control unit 100 may calculate the crack index by tax exemption and estimate the possibility of cracking due to tax exemption. Here, the duty-free crack index is a measure of the probability of occurrence of cracks due to duty-freeness, and can be calculated by the following equation (1), as shown in FIG.

Figure pat00001

Here, Y means duty cycle cracking index, X 1 denotes the peripheral speed variation (m / min), X 2 denotes the crystallization temperature of the mold powder, and R denotes the standard deviation.

In addition, the control unit 100 can determine the post-process after the slab is inserted depending on the possibility of occurrence of the crack due to the predicted duty-free. For example, if the crack index is not less than a reference value (for example, 1.2) by the duty of the control unit 100, the slab is put into the surface grinding process, and if the crack index is less than the reference value, the slab can be put into the rolling process. Here, the reference value is basically set in advance, and can be designed into various values according to the intention of the user, specification of the process facility, and the like.

In other words, in the past, all the slabs produced to reduce the surface defect of the product were surface-sparred to check whether cracks were generated by exemption from duty, and when cracks were found by the duty-free process, the load was increased, And the cost increases. However, the control unit 100 puts only the slab which is judged to be cracked due to the duty free, into the surface grinding process, and the slab, which is less likely to be cracked due to the duty free, immediately feeds the slab into the rolling process, It is possible to prevent the process from being performed, thereby reducing the time and cost required for manufacturing the slab.

On the other hand, the control unit 100 may predict the possibility of cracking due to the duty-free operation only when the crystallization temperature of the mold powder is within the preset reference range. That is, when the crystallization temperature of the mold powder is within a certain range, the possibility of occurrence of cracks due to the fluctuation of the peripheral speed and the exemption of the duty may be tendency. Therefore, when the crystallization temperature of the mold powder is out of the reference range, The slab may be produced by using the slab.

FIG. 3 is a flowchart for explaining a slab manufacturing method according to an embodiment of the present invention. Referring to FIG. 3, a slab manufacturing method according to this embodiment will be described.

As shown in FIG. 3, the controller 100 first measures the peripheral speed of the mold (S200). For example, the control unit 100 may measure the velocity of a roll existing in a segment and use the velocity as a peripheral velocity in the mold.

Next, the controller 100 receives the crystallization temperature of the mold powder (S210). For example, the control unit 100 can receive the crystallization temperature of the mold powder used in the continuous casting process from the host controller.

After the step S210, the controller 100 predicts the possibility of cracking due to the duty-free operation (S220). That is, the control unit 100 can predict the possibility of cracking due to the duty-free operation based on the change in the peripheral speed according to the circumference measured in the step S200 and the crystallization temperature of the mold powder inputted in the step S210. For example, the control unit 100 can calculate the crack index by duty-free and predict the possibility of cracking due to tax exemption. Here, the crack index is a measure of the possibility of occurrence of cracks by duty-free, and can be calculated by the above-described formula (1).

Then, the control unit 100 checks whether the possibility of cracking by the duty-free operation predicted in the step S220 is equal to or greater than a reference value (S230). Here, the reference value is basically set in advance, and can be designed into various values according to the intention of the user, specification of the process facility, and the like.

As a result of the checking in step S230, if the possibility of cracking due to the duty-free condition is more than the reference value, the control unit 100 puts the slab into the surface grinding process (S240).

On the other hand, if it is determined in step S230 that the possibility of cracking due to the duty-free process is less than the reference value, the control unit 100 puts the slab into the rolling process (S250). In other words, in the past, all the slabs produced to reduce the surface defect of the product were surface-sparred to check whether cracks were generated by exemption from duty, and when cracks were found by the duty-free process, the load was increased, And the cost increases. However, the control unit 100 puts only the slab which is judged to be cracked due to the duty free, into the surface grinding process, and the slab, which is less likely to be cracked due to the duty free, immediately feeds the slab into the rolling process, It is possible to reduce the time and cost required for slab manufacture.

As described above, the apparatus and method for manufacturing a slab according to an embodiment of the present invention predicts the possibility of cracking due to duty-free based on the change in peripheral speed and the crystallization temperature of the mold powder, and predicts the possibility of cracking By determining the post-process, an unnecessary process can be prevented from being performed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

100:
110:
120: Input unit

Claims (6)

A peripheral speed measuring unit for measuring a peripheral speed of the mold;
An input part for receiving the crystallization temperature of the mold powder; And
A controller for predicting a possibility of occurrence of cracks due to the duty-free based on the change in the peripheral speed according to the measured circumferential speed and the crystallization temperature of the mold powder, and for determining a post-process in which the slab is inserted according to the possibility of cracking due to the predicted duty- Comprising a slab manufacturing apparatus.
The method according to claim 1,
Wherein the slab is put into a surface grinding step if the possibility of cracking due to the duty-free process is higher than a reference value, and the slab is put into a rolling process when the possibility of cracking is less than the reference value, Device.
The method according to claim 1,
The control unit calculates a crack index by duty-free and predicts the possibility of cracking due to the duty-
Wherein the crack index is calculated by the following equation (1).
(1)
Figure pat00002

(Where Y is the duty-free crack index, X 1 is the peripheral velocity change (m / min), X 2 is the crystallization temperature of the mold powder, and R is the standard deviation).
The method according to claim 1,
Wherein the controller estimates the possibility of cracking by the duty-free only when the crystallization temperature of the mold powder is within a preset reference range.
Measuring a peripheral speed in the mold by the control unit;
Receiving the crystallization temperature of the mold powder;
Predicting the possibility of occurrence of cracks by duty-free based on the change in the peripheral speed according to the measured circumferential speed and the crystallization temperature of the mold powder; And
Wherein the control unit determines a post-process in which the slab is inserted depending on the possibility of cracking due to the predicted duty-free period.
6. The method of claim 5,
In the step of determining the post-process in which the slab is inserted,
Wherein the control unit determines the surface finishing step as the subsequent step if the possibility of cracking due to the duty-free condition is equal to or greater than the reference value, and determines the rolling step as the subsequent step when the possibility of cracking is less than the reference value, Slab.
KR1020150072893A 2015-05-26 2015-05-26 Apparatus and method for manufacturing slab KR20160138705A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102237627B1 (en) * 2020-03-26 2021-04-07 현대제철 주식회사 Methods of continuous casting
KR20210147252A (en) * 2020-05-28 2021-12-07 현대제철 주식회사 Method and apparatus for preventing to slab side surface defect

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102237627B1 (en) * 2020-03-26 2021-04-07 현대제철 주식회사 Methods of continuous casting
KR20210147252A (en) * 2020-05-28 2021-12-07 현대제철 주식회사 Method and apparatus for preventing to slab side surface defect

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