KR101795470B1 - Casting apparatus and method thereof - Google Patents

Casting apparatus and method thereof Download PDF

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Publication number
KR101795470B1
KR101795470B1 KR1020150163459A KR20150163459A KR101795470B1 KR 101795470 B1 KR101795470 B1 KR 101795470B1 KR 1020150163459 A KR1020150163459 A KR 1020150163459A KR 20150163459 A KR20150163459 A KR 20150163459A KR 101795470 B1 KR101795470 B1 KR 101795470B1
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South Korea
Prior art keywords
molten steel
ladle
blocking member
discharge port
inert gas
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KR1020150163459A
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Korean (ko)
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KR20170059280A (en
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김성줄
정은주
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주식회사 포스코
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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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

The present invention relates to a casting apparatus and a casting method, and more particularly, to a casting method comprising the steps of: preparing ladle for receiving refined molten steel; Disposing at least a discharge port provided at a lower portion of the ladle and a blocking member at an upper portion of the ladle so as to cover a blow nozzle provided in the periphery of the discharge port; A step of lowering the blocking member to contact the bath surface of the molten steel; Injecting an inert gas into the molten steel through the blown nozzle; And discharging the molten steel through the outlet, wherein the molten steel bath surface is prevented from being oxidized by the air in the ladle, thereby suppressing the quality deterioration of the cast steel being cast.

Description

[0001] Casting apparatus and method [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting apparatus and a casting method, and more particularly, to a casting apparatus and a casting method capable of ensuring cleanliness of molten steel.

In the casting process, for example, a continuous casting process, a ladle containing refined molten steel is seated in a continuous casting machine, and molten steel in a liquid state moves from a ladle to a mold through a tundish, . In such a casting process, the cleanliness of the molten steel determines the quality of the cast steel, so it is very important to maintain the cleanliness of the molten steel during casting.

Therefore, work is continuously carried out to remove inclusions in molten steel from ladles or tundish containing molten steel before or during casting. For example, a ladle cover is disposed on the ladle, and an inert gas is blown into the molten steel at the lower part of the ladle, and the inclusions contained in the molten steel are separated and separated into slag to remove inclusions in the molten steel.

However, when the inert gas is blown into the molten steel at the bottom of the ladle, the inert gas generates bubbles in the molten steel, so that the bubbles float on the molten steel while the slag layer flows through the molten steel. When such hot water is generated, the molten steel is oxidized by contact with the air in the ladle, and as a result, the quality of the cast steel is adversely affected.

KR2013-0053181A KR2012-0073412A

The present invention provides a casting apparatus and a casting method capable of ensuring cleanliness of molten steel.

A casting apparatus according to an embodiment of the present invention includes a casting apparatus including a casting apparatus including a casting apparatus including a casting apparatus for casting molten steel into a molten steel, And a blocking member provided to be movable up and down on the ladle and covering at least the outlet and the upper region of the blowing nozzle.

The blocking member may include a support shaft disposed in an upper portion of the ladle and a blocking plate connected to a lower portion of the support shaft in a direction crossing the longitudinal direction of the support shaft.

The blocking member may include a driving device for moving the supporting shaft in the vertical direction, a pressure sensor connected to the supporting shaft, and a controller for controlling the operation of the driving device by using the result measured by the pressure sensor have.

The blocking member may include a CaO-based refractory at least in part.

The barrier plate may comprise a CaO-based refractory.

The shutoff plate may have an exhaust port penetrating the shutoff plate in a vertical direction.

The blocking plate may have an exhaust groove extending laterally from a bottom surface of the blocking plate.

The diameter of the blocking plate can be defined by the following equation.

expression)

Figure 112015113571075-pat00001

Where L is the distance from the center of the discharge port to the center of the blow nozzle and r is the radius of the blow nozzle.

A casting method according to an embodiment of the present invention is a casting method comprising the steps of: preparing ladle containing refined molten steel; Disposing at least a discharge port provided at a lower portion of the ladle and a blocking member at an upper portion of the ladle so as to cover a blow nozzle provided in the periphery of the discharge port; A step of lowering the blocking member to contact the bath surface of the molten steel; Injecting an inert gas into the molten steel through the blown nozzle; And discharging the molten steel through the discharge port.

In the process of discharging the molten steel, the blocking member may be lowered to continuously contact the molten steel bath surface.

The pressure value measured by the pressure sensor provided at the blocking member at an initial stage of the blowing of the inert gas before the molten steel is discharged in the process of blowing the inert gas is set as a reference pressure value, The blocking member may be lowered to contact the bath surface of the molten steel so that the pressure value measured by the pressure sensor corresponds to the reference pressure value.

The blocking member may be lowered according to the discharge velocity of the molten steel to contact the molten steel bath surface.

According to the present invention, the oxidation of molten steel in the ladle during casting can be suppressed or prevented. That is, the slag layer on the molten steel flows due to the inert gas blown to remove the inclusions in the molten steel, thereby suppressing or preventing the occurrence of the slag that exposes the molten steel bath surface. Therefore, it is possible to prevent the molten steel bath surface from being oxidized by the air in the ladle, thereby suppressing the quality deterioration of the cast steel being cast.

In addition, inclusions in the molten steel can be trapped by the blocking member for suppressing the generation of oil spillage, thereby preventing the load from being generated in the step for removing inclusions from the tundish.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing the configuration of a casting apparatus according to an embodiment of the present invention; FIG.
Fig. 2 is a view showing a part of the constitution of the casting apparatus shown in Fig. 1. Fig.
3 is a view showing the configuration of the shielding portion shown in Fig.
4 is a view showing another embodiment of the shield.
5 is a diagram for explaining a correlation between a ladle and a shielding portion;
6 is a view showing a use state of a casting apparatus according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. Wherein like reference numerals refer to like elements throughout.

FIG. 1 is a view schematically showing a configuration of a casting apparatus according to an embodiment of the present invention, FIG. 2 is a view showing a part of the configuration of the casting apparatus shown in FIG. 1, 4 is a view showing another embodiment of the shielding portion, and Fig. 5 is a view for explaining the correlation between the ladle and the shielding portion.

1, a casting apparatus such as a continuous casting apparatus receives molten steel through a ladle 10 containing molten steel refined in a steelmaking process and an injection nozzle 16 connected to the ladle 10, A tundish 20 for temporarily storing molten steel stored in the tundish 20 and a mold 30 for receiving the molten steel stored in the tundish 20 through the immersion nozzle 22 and performing initial solidification in a predetermined shape. A cooling line 40 provided at a lower portion of the mold 30 and in which a plurality of segments are continuously arranged so as to perform a series of molding operations while cooling the non-solidified slab S drawn from the mold 30, .

The process of casting the slab S using such a casting apparatus will be described.

The molten steel in the ladle 10 is injected into the tundish 20 through the injection nozzle 16 and the molten steel injected into the tundish 20 is injected into the mold 30 through the immersion nozzle 22. At this time, a tundish cover 21 for suppressing the oxidation of the molten steel and the temperature drop of the molten steel may be disposed on the tundish 20. Molten steel injected into the mold 30 is firstly cooled in the mold 30 and the casting S withdrawn from the mold 30 is secondarily cooled while passing through the cooling line 40.

In the casting process, a process for removing inclusions in the molten steel is performed. In the ladle 10, an inert gas is supplied into the molten steel through the blowing nozzle 14 under the ladle 10 to separate inclusions in the molten steel, In the slag. At this time, bubbles are generated in the molten steel by the inert gas, and the slag formed on the molten steel flows while the bubbles float to form the molten steel bath surface, that is, the slag. When the hot water is formed in this way, there is a problem that the molten steel is oxidized by reacting with air in the ladle 10, that is, oxygen.

Therefore, in the present invention, the blocking member 100 movable in the up-and-down direction can be provided to prevent the leakage of the inert gas from being brought into contact with the air in the ladle 10. [

2 to 5, a casting apparatus according to an embodiment of the present invention will be described in detail.

The casting apparatus according to the embodiment of the present invention may include a ladle 10 and a blocking member 100 provided on the ladle 10 so as to be movable up and down.

The ladle 10 includes a scion 10a and a refractory layer 10b which is redissolved in the scion 10a and a space for accommodating molten steel therein may be formed. And an outlet 12 for injecting molten steel into the tundish 20 may be formed at the bottom, that is, at the bottom. A blowing nozzle 14 for blowing inert gas into the molten steel may be formed around the discharge port 12. A plurality of blowing nozzles 14 may be formed radially around the discharge port 12 and may be formed to have a diameter smaller than the diameter of the discharge port 12. [

The discharge port 12 and the blowing nozzle 14 may be biased toward one side with respect to the center of the ladle 10.

And a lid cover 11 for blocking the inside of the ladle 10 from the outside may be provided on the ladle 10. A through hole (not shown) may be formed in the ladle cover 11 so that the blocking member 100 can be inserted through the through hole.

The shielding member 100 is vertically movable on the ladle 10 and includes a support shaft 110 disposed in a vertical direction and a support shaft 110 extending in a direction crossing the support shaft 110 As shown in FIG. Further, it may include a driving device (not shown) for moving the supporting shaft 110 in the vertical direction and a control unit (not shown) for controlling the operation of the driving device.

The blocking member 100 may be formed of a refractory capable of withstanding a high temperature working environment. At this time, at least a part of the blocking member 100 may contain a specific component so as to capture inclusions in the charcoal, and may include a CaO refractory to capture Al 2 O 3 in the molten steel. Accordingly, the blocking member 100 may be formed entirely of CaO-based refractory material, or may be formed of a CaO-based refractory material. Or the shielding plate 120 may be formed by forming an outer shape with a magnesia refractory and coating the surface with a CaO refractory.

The support shaft 110 passes through the lid cover 11 and can be disposed in the vertical direction. The upper portion of the support shaft 110 may be disposed on the upper side of the lid cover 11 and the lower portion may be disposed on the lower side of the lid cover 11. [ Thus, when the lid cover 11 is disposed on the ladle 10, the upper portion of the support shaft 110 can be disposed outside the ladle 10 and the lower portion can be disposed inside the ladle 10. A drive device is connected to the upper portion of the support shaft 110 to vertically move the support shaft 110 up and down.

The blocking plate 120 may be connected to a lower portion of the support shaft 110 in a direction crossing the longitudinal direction of the support shaft 110, that is, in an orthogonal direction. The blocking plate 120 may be formed to have a predetermined area, for example, a disc shape. The blocking plate 120 may be soaked in the molten steel to cover the position where the inert gas is generated by the inert gas. Usually, a slag layer is formed on the upper surface of the molten steel bath. When the inert gas is blown through the blowing nozzle 14, the slag layer flows and the slag is generated. Thus, the blocking plate 120 is disposed at a position directly above the discharge port 12 and the blowing nozzle 14 so as to cover the portion where the fragrance is generated, thereby preventing the fragrance from contacting the air in the ladle 10. At this time, the inert gas blown into the molten steel generates bubbles in the molten steel, and the bubbles float to discharge the inert gas to the outside of the molten steel. Since the discharge path of the inert gas is blocked by the blocking plate 120, the inert gas moves to the outside of the blocking plate 120 and is discharged along the periphery of the blocking plate 120. When the inert gas is discharged to the outside of the molten steel by the above-described method, the inert gas is recirculated to the periphery of the blocking plate 120. In order to solve such a problem, as shown in FIG. 3, a plurality of exhaust ports 122 are formed in the shutoff plate 120 to secure a discharge path for the inert gas, thereby suppressing the generation of scum around the shutoff plate 120 Or can be prevented.

Alternatively, as shown in FIG. 4, exhaust grooves 124a and 124b extending laterally from the bottom surface of the blocking plate 120 may be formed to form an inert gas discharge path. The exhaust grooves 124a and 124b are radially formed on the bottom surface of the blocking plate 120 as shown in Figs. 4B and 4C, and the ends thereof extend to the side of the blocking plate 120 . Needless to say, the exhaust grooves 124a and 124b are not limited thereto and may be formed in various shapes. In this case, the inert gas may be discharged to the periphery of the shielding plate 120 to cause a problem. However, since the inert gas is stably discharged along a predetermined path, that is, along the exhaust grooves 124a and 124b, .

Referring to FIG. 5, the blocking plate 120 may be formed to have at least an area for covering the discharge port 12 and the blowing nozzle 14. The blocking plate 120 may be provided directly above the discharge port 12 and may have a diameter D sufficient to cover all the blowing nozzles 14 provided in the periphery of the discharge port 12, And so on.

expression)

Figure 112015113571075-pat00002

Here, L is the distance from the center of the discharge port 12 to the center of the blow nozzle 14, and r means the radius of the blow nozzle 14.

At this time, since the bubbles generated by the inert gas blown from the blowing nozzle 14 float while spreading to the periphery, the blocking plate 120 has a region where the blowing nozzle 14 opposed to each other with respect to the discharge port 12 is disposed It is preferable to cover the larger area.

The pressure sensor 130 can be connected to the support shaft 110 and can measure the pressure applied to the blocking member 100 by the inert gas. As the pressure sensor 130, various sensors such as a load cell and a strain gauge may be used.

The control unit controls the operation of the driving device by using the pressure value measured by the pressure sensor 130. [

Hereinafter, a casting method according to an embodiment of the present invention will be described.

FIG. 6 is a view showing a use state of a casting apparatus according to an embodiment of the present invention.

First, the ladle 10 for receiving the refined molten steel is provided (see Fig. 6 (a)). The ladle 10 is mounted on a ladle turret (not shown) provided on the upper portion of the tundish 20. When the ladle 10 is mounted on the ladle turret, 16). The blowing nozzle 14 is connected to a pipe for supplying an inert gas.

The ladle cover 11 on which the blocking member 100 is mounted is seated on the ladle 10 (see FIG. 6 (b)). The blocking member 100 is disposed at a position covering at least a part of the upper portion of the ladle 10 and is preferably disposed at a position covering the discharge port 12 provided at the lower portion of the ladle 10 and the blowing nozzle 14 do.

When the blocking member 100 is disposed inside the ladle 10, the blocking member 100 is lowered to bring the blocking plate 120 into contact with the molten metal bath surface (see FIG. 6 (c)). At this time, a slag layer having a predetermined thickness may be formed on the molten steel bath surface accommodated in the ladle 10, and the blocking plate 120 may contact the molten steel bath surface under the slag layer or be partially immersed in molten steel.

Then, an inert gas is blown into the molten iron in the ladle 10 through the blowing nozzle 14. The pressure applied to the blocking member 100 is measured through the pressure sensor 130 provided in the blocking member 100 at the beginning of the blowing of the inert gas before the molten steel is discharged through the discharge port 12. The measured pressure value may be set to a reference pressure value required to lower the blocking member 100. [

When the reference pressure value is set, the injection nozzle 16 is opened to discharge the molten steel into the tundish 20 through the discharge port 12 (see FIG. 6 (d)). The molten steel is injected into the tundish 20 or the mold 30 through the outlet 12 via the injection nozzle 16.

As the molten steel is discharged from the ladle 10, the molten steel level of the molten steel is gradually lowered, so that the shielding member 100 is lowered along the molten steel level of the molten steel and continuously contacts the molten steel while the molten steel is discharged.

The lowering of the blocking member 100 compares the pressure value measured by the pressure sensor 130 constituting the blocking member 100 with the reference pressure value and controls the operation of the driving unit according to the comparison result . For example, when the blocking member 100 is separated from the molten steel bath, the pressure of the inert gas is not sufficiently transmitted to the blocking member 100, so that the pressure measured by the pressure sensor 130 becomes smaller than the reference pressure value, 100) is immersed too deeply in the molten steel, it becomes larger than the reference pressure value. For example, the control unit controls the pressure sensor 130 so that the pressure value measured by the pressure sensor 130 corresponds to the reference pressure value, for example, the pressure value measured is equal to the reference pressure value or is maintained to be within a deviation range of about 5% The blocking member 100 can be lowered by controlling the operation of the apparatus.

Alternatively, the amount of change in the molten steel surface level of the molten steel in the ladle 10 may be calculated in advance according to the amount of molten steel discharged, and the control unit may control the operation of the driving device to correspond to the molten steel surface level change amount.

As described above, when the blocking member 100, more specifically, the blocking plate 120 is brought into contact with the molten steel bath surface, it is possible to prevent the deterioration of the molten steel bath surface due to the injection of the inert gas.

The inert gas blown into the molten steel forms bubbles in the molten steel and floats on the molten steel bath surface. The inert gas thus floated is discharged to the outside of the molten steel through the exhaust port 122 or the exhaust grooves 124a and 124b formed in the blocking plate 120 Can be discharged. The inclusions contained in the molten steel are captured by the inert gas and collected in the blocking plate 120, and the inclusions not captured by the blocking plate 120 can be collected and removed in the slag.

When the molten steel in the ladle 10 is discharged, the blocking member 100 is lifted (see (e) in FIG. 6), the ladle cover 11 is pulled up and the blocking member 100 is taken out of the ladle 10 .

In this way, the occurrence of the internal nodules in the ladle can be prevented, and the oxidation of the molten steel due to the air in the ladle can be suppressed. In addition, by collecting and removing inclusions in the molten steel through the blocking member, the load for removing inclusions in the tundish can be reduced.

Although the present invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the present invention is not limited thereto but is limited by the following claims. Accordingly, those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the spirit of the following claims.

10: Ladle 12: Outlet
14: blow nozzle 20: tundish
30: mold 40: cooling line
100: blocking member 110: supporting shaft
120: blocking plate 122: exhaust port
124a, 124b:

Claims (12)

A ladle having a discharge port for containing molten steel therein and discharging the molten steel to a lower portion thereof and a blowing nozzle provided outside the discharge port for discharging gas into the molten steel,
And a blocking member provided to be movable up and down on the ladle and covering at least the outlet and the upper region of the blowing nozzle. The method according to claim 1,
The blocking member
A support shaft disposed in an upper portion of the ladle in a vertical direction,
And a blocking plate connected to a lower portion of the support shaft in a direction crossing the longitudinal direction of the support shaft. The method of claim 2,
The blocking member
A drive device for moving the support shaft in the vertical direction,
A pressure sensor connected to the support shaft,
And a controller for controlling the operation of the drive unit using the result measured by the pressure sensor. The method of claim 3,
Wherein said shielding member comprises a CaO-based refractory at least in part. The method of claim 4,
Wherein said barrier plate comprises a CaO-based refractory. The method of claim 5,
Wherein the cutoff plate is formed with an exhaust port passing through the cutoff plate in a vertical direction. The method of claim 5,
Wherein the cutoff plate is formed with an exhaust groove extending laterally from a bottom surface of the cutoff plate. The method according to claim 6 or 7,
Wherein the diameter of the blocking plate is defined by the following equation.
expression)
Figure 112017048247861-pat00003

Where L is the distance from the center of the discharge port 12 to the center of the blow nozzle 14, and r means the radius of the blow nozzle. As a casting method,
A step of preparing ladle in which the refined molten steel is received;
Disposing at least a discharge port provided at a lower portion of the ladle and a blocking member at an upper portion of the ladle so as to cover a blow nozzle provided in the periphery of the discharge port;
A step of lowering the blocking member to contact the bath surface of the molten steel;
Injecting an inert gas into the molten steel through the blown nozzle;
Discharging the molten steel through the discharge port;
≪ / RTI > The method of claim 9,
Wherein the blocking member is lowered to continuously contact the molten steel bath surface during the discharge of the molten steel. The method of claim 10,
A pressure value measured by a pressure sensor provided in the blocking member at an initial stage of the blowing of the inert gas before the molten steel is discharged in the course of blowing the inert gas is set as a reference pressure value,
Wherein the shutoff member is lowered so that the pressure value measured by the pressure sensor corresponds to the reference pressure value in the process of discharging the molten steel to contact the melt surface of the molten steel. The method of claim 10,
And the blocking member is lowered according to the discharge speed of the molten steel to be brought into contact with the molten steel bath surface.
KR1020150163459A 2015-11-20 2015-11-20 Casting apparatus and method thereof KR101795470B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
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KR102227826B1 (en) * 2018-10-26 2021-03-15 주식회사 포스코 Casting equipment and casting method
CN109719290B (en) * 2019-02-20 2023-09-12 山东钢铁股份有限公司 Ladle circumferential seam type ventilation upper nozzle pocket brick and argon blowing metallurgical method thereof
KR102361362B1 (en) * 2020-02-12 2022-02-10 주식회사 포스코 Well block, apparatus for casting and method thereof

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Publication number Priority date Publication date Assignee Title
KR20190077697A (en) 2017-12-26 2019-07-04 주식회사 포스코 Casting device

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