KR101974569B1 - Apparatus for sealing of mold and casting method using the same - Google Patents

Abstract

The present invention relates to a sealing apparatus for a mold and a casting method using the sealing apparatus. The sealing apparatus is formed in a plate shape so as to cover at least a part of an upper surface of a dummy bar head inserted into the mold, And a first sealing member having a first region that is in contact with an upper surface of the dummy bar head and a second region that is spaced apart from an upper surface of the dummy bar head to form a gap, Contamination or damage of the casting equipment can be suppressed and surface defects of the cast steel can be suppressed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold sealing apparatus,

The present invention relates to a mold sealing apparatus and a casting method using the same, and more particularly, to a mold sealing apparatus capable of suppressing contamination or damage of a casting facility and suppressing surface defects of the casting mold, and a casting method using the same will be.

In general, the continuous casting facility is to feed the molten steel produced in the steelmaking process to the ladle, to receive it in the tundish by using the long nozzle in the continuous casting process, then to supply it as mold, to be. At this time, the mold is formed to have a structure in which the cooling water passes through the inside of the mold, and is indirectly cooled by the cooling water.

The casting mold, which is the core of the continuous casting facility, is produced by cooling and solidifying the molten steel injected through the nozzle by the indirect cooling method, and drawing the casting continuously to the lower part of the casting mold. When the continuous casting process is started, a dummy bar is inserted into the mold before the molten steel is injected into the mold, a space formed between the mold and the dummy bar is filled with a sealant, and then a coil, a sealing material for sealing a metal material such as a chip is injected. The sealing material is injected to prevent the molten steel from being fused to the molten steel and to prevent the molten steel from flowing out between the inner wall of the mold and the dummy bar. Part of the molten steel is dissolved by the molten steel, And moves to the lower portion of the mold together. At this time, when the molten steel comes into contact with the sealing material, the temperature rapidly lowers and coagulates, so that the leakage can be suppressed between the mold and the dummy bar.

However, the sealing material, that is, the chips that have been packed between the cast strip and the dummy bar when the cast strip passes the bending portion that is converted from the vertical portion to the horizontal portion, is accumulated and accumulated around the casting roll. All. The chips accumulated in the periphery of the casting rolls thus flow into the nozzles for injecting the cooling water into the castings to cause clogging of the nozzles, and they may be adhered to the casting rolls and cause surface defects of the castings. In addition, since the worker has to remove the accumulated sealing material around the casting roll, the burden on the worker is increased and the risk of safety accident is exposed.

KR 1008066 B KR 10-2009-0021492 A

The present invention provides a sealing apparatus capable of facilitating maintenance of a casting facility and a casting method using the same.

The present invention provides a mold sealing apparatus capable of suppressing the deterioration of the quality of a cast steel by a sealing material and a casting method using the same.

A sealing apparatus for a mold according to an embodiment of the present invention is a sealing apparatus which is inserted into a mold and is formed in a plate shape so as to cover at least a part of an upper surface of a dummy bar head inserted into the mold, And a first sealing material having a first area contacting the upper surface of the dummy bar head and a second sealing area spaced from the upper surface of the dummy bar head to form a gap.

The first region and the second region may be formed to extend in one direction.

The first region and the second region may include at least one of a curved surface, an inclined surface, and a plane.

The first region may be formed so as to be surrounded by the second region.

The first region may include at least one of a curved surface, an inclined surface, and a plane, and the second region may include a plane.

The first region and the second region may be provided on one surface of the first sealing material periodically or repeatedly.

A plurality of the first sealing members may be provided.

A third region having a shape corresponding to the first region and a fourth region having a shape corresponding to the second region on the other surface of the first sealing member.

Wherein the dummy bar head includes a concave groove, the concave groove including an inclined surface and a bottom surface connected to an upper surface of the dummy bar head, And a second sealing member connected to the first member and having a second member contactable with an inclined surface of the dummy bar head.

The first member may have a concavo-convex structure capable of contacting at least one region of the first region, the second region, the third region, and the fourth region on at least one surface.

A casting method according to an embodiment of the present invention includes the steps of disposing a dummy bar head inside a mold, installing a plate-shaped first sealing material capable of contacting at least a part of an upper surface of the dummy bar head, Wherein the step of installing the first sealing material comprises the steps of: bringing the upper surface of the dummy bar head into contact with at least a part of the first sealing material, so that the upper surface of the dummy bar head and the upper surface of the first sealing material At least a part of which can be spaced apart to form a gap.

The plurality of first sealing members may be provided so as to overlap at least a part of the plurality of first sealing members, and the plurality of first sealing members may be provided so that the overlapping portions are in close contact with each other.

And a step of providing a second sealing material which can be in contact with at least an inclined surface of the dummy bar head prior to the step of injecting the molten steel.

And a step of providing a third sealing material having a shape of at least one of a coil shape and a wire shape after the step of installing the second sealing material.

According to the embodiment of the present invention, it is possible to prevent the sealing material from accumulating in the casting equipment during casting. Therefore, it is possible to prevent the casting equipment from being contaminated or damaged by the sealing material, and the quality of the cast steel can be suppressed or prevented by the sealing material. In addition, it is possible to alleviate the burden on the worker to remove the sealing material that has fallen into the casting equipment, and to prevent a safety accident that may occur in the process of removing the sealing material.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 schematically shows the construction of a continuous casting facility. Fig.
2 is a view showing a state in which a sealing device according to an embodiment of the present invention is installed in a mold.
3 is a view showing a first sealing material according to an embodiment of the present invention.
4 and 5 are views showing a modified example of the first sealing material.
6 is a view showing a second sealing material according to an embodiment of the present invention.
7 is a view showing an installation state of a sealing device according to an embodiment of the present invention.
8 is a view showing an installation state of a sealing apparatus according to a modification of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method and an apparatus for producing a cast steel according to an embodiment 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.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view schematically showing a structure of a continuous casting facility. FIG.

With reference to Fig. 1, a general casting facility as a casting casting apparatus will be described.

The continuous casting facility includes a ladle 10 containing refined molten steel in a steelmaking process, a tundish 20 for receiving molten steel through an injection nozzle connected to the ladle 10 and temporarily storing the molten steel, And a mold 30 for receiving molten steel stored in the dish 20 and performing initial solidification in a predetermined shape. A cooling line (not shown) is provided in the lower part of the mold 30 and in which a plurality of segments 50 are successively arranged so as to perform a series of molding operations while cooling the non-solidified casting 1 pulled from the mold 30 40). The cast strip 1 pulled out of the mold 30 passes through a space between the upper frame 51 and the lower frame 52 while passing through a guide roll 58 and a bearing housing And guided and pressed by a plurality of guide roll assemblies (53, 54), which are formed into a predetermined shape. That is, a plurality of segments 50 are aligned and arranged in a direction crossing the direction in which the cast steel 1 moves, and the cast steel 1 passes between a plurality of guide rolls 58 facing each other, that is, At this time, the guide rolls 58 on both sides of the cast steel 1 press the cast steel.

Further, since the cast steel is difficult to move along the strands due to its own weight, the dummy bars 60 are inserted into the strands through the mold before injecting the molten steel into the casting molds. The dummy bar 60 moves along the strand by a pinch roll (not shown) in the strand and pulls out the slab while being connected to the slab. The dummy bar 60 is linked with a dummy bar tail, a dummy bar body, and a dummy bar head which are connected to the casting.

The dummy bar 60 helps to pull out the cast steel and seal the casting mold 30 to prevent molten steel from flowing out. That is, the mold 30 is open at the top and bottom to enable the withdrawal of the cast strip. When the molten steel is injected into the casting mold 30, the molten steel flows out through the lower portion of the mold 30. Therefore, the molten steel is injected into the mold 30 after inserting the dummy bar head 61 into the mold 30 . At this time, before the molten steel is injected into the mold 30, the space between the mold 30 and the dummy bar head 61 is filled with a silt such as mud and the molten steel and the dummy bar head 61 are prevented from fusing A sealing material such as a metal chip or a coil can be inserted.

The sealing material prevents the molten steel from directly contacting the dummy bar head 61 inside the mold 30. When the molten steel is injected, some of the molten steel is melted by the heat of the molten steel to lower the temperature of the molten steel, You can give. When the cast strip 1 is pulled out, it can move along the moving direction of the cast strip 1 and be discharged from the casting mold 30.

The metal chips in the sealing material are formed in the form of particles having a size of about 10 to 30 mm. In the process of drawing the main pieces, the unmelted metal chips are accumulated off the casting equipment, for example, around the casting roll. The metal chips accumulated in the casting equipment thus have a problem of causing contamination and damage to the casting equipment or causing surface defects of the cast steel.

Accordingly, in the present invention, a plate-shaped sealing material can be used without using a metal chip as a sealing material in order to solve the above-described problems.

2 is a view showing a state in which a sealing device according to an embodiment of the present invention is installed in a mold, FIG. 3 is a view showing a first sealing material according to an embodiment of the present invention, FIGS. 4 and 5 are cross- FIG. 6 is a view showing a modification of the sealing material, and FIG. 6 is a view showing a second sealing material according to an embodiment of the present invention.

2, a sealing apparatus according to an embodiment of the present invention includes a dummy bar head 61 inserted in a mold 30, a first And a sealing member 110. Also, the dummy bar head 61 may be provided with a recessed groove 62 for connection with the cast steel. The concave groove 62 may include an inclined surface 61b and a bottom surface 61c which are connected to the upper surface 61a of the dummy bar head 61. The inclined surface 61b may be formed between the casting and the dummy bar head 61, The sealing apparatus according to the embodiment of the present invention may further include a second sealing member 120 at least a part of which can contact the inclined surface 61b.

The first sealing material 110 according to the embodiment of the present invention may be formed of a metal material and may be formed in a plate shape to cover at least a part of the upper surface 61a of the dummy bar head 61. [ The first sealing member 110 may be formed in a plate shape having a width, a length and a height, and may be formed to have an area corresponding to the upper surface of the dummy bar head 61 or to have a similar area. At this time, the first sealing member 110 having a size corresponding to the bottom surface of the concave groove 62 may be additionally provided.

3 shows a first sealing member 110 according to an embodiment of the present invention. FIG. 3 (a) is a side view of the other surface 110a of the first sealing member 110 or the upper surface 110a of the first sealing member 110 FIG. 3 (b) shows one surface 110b of the first sealing member 110 or the bottom surface 110b of the first sealing member 110. FIG. 3 (a) and 3 (b), the first sealing material 110 is provided on at least one side 110a of the first sealing material 110, which is in contact with at least a part of the upper surface 61a of the dummy bar head 61, Region 111 and a second region 112 spaced apart from at least a portion of the top surface 61a to form a gap g. One surface 110b of the first sealing material 110 is a surface facing the upper surface 61a of the dummy bar head 61 or a lower surface contacting the upper surface 61a of the dummy bar head 61. [ (110b). The other surface 110a of the first sealing material 110, that is, the upper surface 110b of the first sealing material 110, may be formed flat.

The first region 111 may be formed to protrude downward to contact the upper surface of the dummy bar head 61 and the second region 112 may protrude toward the lower portion where the dummy bar head 61 is located, Can be formed to be spaced apart from the upper surface 61a of the dummy bar head 61 so as to form a gap g between the first sealing member 110 and the upper surface 61a of the dummy bar head 61. [

The first sealing member 110 reduces the contact area with the upper surface 61a of the dummy bar head 61 and reduces the gap formed between the first sealing member 110 and the dummy bar head 61 It is possible to reduce the phenomenon that the heat of the molten steel is transmitted to the dummy bar head 61 through the through-hole. It is possible to suppress the phenomenon that the first sealing member 110 and the dummy bar head 61 are welded together.

The first region 111 and the second region 112 may be formed to extend in one direction of the first sealing member 110. For example, the first region 111 and the second region 112 may be formed to extend in the width direction of the cast strip 1 or in the thickness direction of the cast strip 1. The first region 111 and the second region 112 may be periodically formed on one surface of the first sealing member 110, or may be formed repeatedly. In the former case, the first region 111 and the second region 112 have a predetermined rule and are alternately formed. In the latter case, the first region 111 and the second region 112 are formed in a predetermined rule Which means that they are alternately formed. For example, in the former case, the first region 111 and the second region 112 may have a constant width and may be formed alternately. In the latter case, the first region 111 and the second region 112 are alternately formed, and the first region 111 has a different width and the second region 112 has a different width .

As shown in FIG. 3, the first region 111 and the second region 112 may be formed to have a curved surface.

The first region 111 and the second region 112 may be formed in various shapes. As shown in FIGS. 4A and 4B, the first region 111 and the second region 112 112 may be formed to extend in one direction of the first sealing member 110, have inclined surfaces, form an attachment, have inclined surfaces, and have planes. Alternatively, as shown in FIG. 4 (c), the first region 111 may be formed to have an embossed shape or a dimple shape so as to be surrounded by the second region 112. In this case, the first region 111 may be formed to have a curved surface or a sloped surface, and the second region 112 may be formed to have a plane, and the first region 111 and the second region 112 may have a And may be formed to have an opposite shape.

In addition, the first region 111 and the second region 112 are formed to have an inclined plane and a plane, and the cross-sectional shape may have a shape similar to a rectangular wave.

Here, the first region 111 and the second region 112 may be formed to have various sizes depending on the casting conditions, and may have a width and height of about 5 to 15 mm. The contact area between the first sealing member 110 and the dummy bar head 61 increases so that the dummy bar head 61 is overheated Or the first sealing material 110 may be fused to the dummy bar head 61. When the size of the first region 111 and the second region 112 is larger than the predetermined range, the shape of the first sealing material 110 is deformed and the gap between the first sealing material 110 and the dummy bar head 61 And the molten steel flows into the space, so that the cast steel and the dummy bar head 61 can be welded together. There is a problem in that when the main body is fused to the dummy bar head 61, it is difficult to separate the main body from the dummy bar 60 and the dummy bar head 61 is damaged when the dummy bar 60 is detached.

Meanwhile, a plurality of the first sealing members 110 may be provided. The first sealing member 110 may be formed to have a size corresponding to the upper surface 61a of the dummy bar head 61 so that only one of the first sealing members 110 is used, The case where the cover 61a can be covered has been described. However, when the first sealing material 110 is formed to have a size smaller than the area of the upper surface 61a of the dummy bar head 61, a plurality of first sealing materials 110 may be provided and a plurality of dummy bars 60 may be used The upper surface 61a of the dummy bar head 61 can be covered. That is, the size of the dummy bar head 61 may vary depending on the size of the casting slab, for example, the width and thickness of the cast slab. In other words, the size of the casting can be determined by the size of the mold 30, e.g., the inner-wall distance or the horizontal cross-sectional area corresponding to the width and thickness of the casting. When the width and thickness of the casting die are changed, the size of the casting mold 30 is changed and the size of the dummy bar head 61, for example, the size of the upper face 61a, It can be different. Accordingly, a plurality of first sealing members 110 may be provided and the upper surface of the dummy bar head 61 may be effectively covered depending on the size of the dummy bar head 61. The first sealing member 110 may be formed in a substantially rectangular shape and each corner may be machined to have a curved surface to suppress contact with the mold 30, or be chamfered.

In this case, the first sealing member 110 may be arranged so that at least a part of the first sealing member 110 overlaps in order to effectively block the contact between the dummy bar head 61 and the molten steel. When overlapping the first sealing members 110, the overlapping regions between the first sealing members 110 may be in close contact with each other to prevent the molten steel from flowing into the first sealing members 110.

5, a first region 111, which is in contact with at least a part of the upper surface 61a of the dummy bar head 61, is formed on one surface of the first sealing material 110 facing the dummy bar head 61, And a second region 112 spaced apart from at least a part of the upper surface of the dummy bar head 61 to form a gap g and a second region 112 formed on the other surface of the first sealing member 110, A third region 113 that can be in contact with the first region 111 and a fourth region 114 that is in contact with the second region 112 can be formed. At this time, the first region 111 and the third region 113, the second region 112 and the fourth region 114 may be formed in a shape corresponding to each other, and the third region 113 and the fourth region The first region 111 and the second region 112 may be formed to include a curved surface, an inclined surface, and a plane.

When a plurality of first sealing members 110 are stacked in this manner, the first sealing member 110 and the second sealing member 110 stacked on the third region 113 and the fourth region 114 of the first sealing member 110 The first region 111 and the second region 112 of the first substrate 110 may be in contact with each other while being in contact with each other. The first sealing members 110 stacked in the vertical direction can be in contact with each other.

If the third region 113 and the fourth region 114 are formed on the other surface of the first sealing member 110, the contact area with the molten steel is increased so that the heat of the molten steel is efficiently transferred to the first sealing member 110 There is an advantage that the molten steel can be rapidly solidified.

Thus, the first sealing member 110 may be formed in a plate shape to cover the upper surface of the dummy bar head 61. Also, the first sealing member 110 can cover the bottom surface of the concave groove 62 of the dummy bar head 61 as well.

The inclined surface 61b formed on the concave groove 62, that is, the side surface of the concave groove 62, can be covered with the second sealing material 120. [

6, the second sealing member 120 includes a first member 120a that can contact the upper surface of the dummy bar head 61 or the first sealing member 110, and a second member 120b that is connected to the first member 120a, And a second member 120b that can be in contact with the second member 61b. The connection part between the first member 120a and the second member 120b may be formed by bending the first member 120a or the second member 120b according to the angle formed by the upper surface 61a and the inclined surface 61b. The second member 120b can be brought into contact with the inclined surface 61b by appropriately bending the two members 120b.

The second sealing member 120 may be formed such that the first member 120a and the second member 120b have flat surfaces as shown in Figs. 6A and 6B. The first region 111, the second region 112, the third region 113, and the fourth region 114 are formed on at least one surface of the first member 120a, as shown in FIG. 6 (c) It is possible to form the concavo-convex structure 122 which can be in contact with at least one of the regions.

This is because the first member 120a is supported by the upper surface of the dummy bar head 61 or the first sealing member 110 when the second sealing member 120 is installed. For example, when the first sealing member 110 having the shape shown in FIG. 3 is used, the second sealing member 120 including the first member 120a having a flat surface as shown in FIG. 6 (a) Can be used. On the other hand, in the case of using the first sealing material 110 having a shape as shown in FIG. 5A, the second sealing material 120 having the concave and convex structure 122 formed therein as shown in FIG. 6C, Can be used.

Hereinafter, a method of casting a cast slab using a sealing apparatus according to an embodiment of the present invention will be described.

FIG. 7 is a view showing an installation state of a sealing apparatus according to an embodiment of the present invention, and FIG. 8 is a view showing an installation state of a sealing apparatus according to a modification of the present invention.

The casting method according to the embodiment of the present invention includes the steps of disposing the dummy bar head 61 inside the mold 30 and forming the dummy bar head 61 between the mold 30 and the dummy bar head 61 by using a sealant A process of filling a space, a process of installing a plate-shaped first sealing material 110 capable of contacting at least a part of the upper surface of the dummy bar head 61, and a process of injecting molten steel into the mold 30 .

First, a dummy bar 60 attached to a dummy bar is inserted into the mold 30. [ At this time, the dummy bar tail and the dummy bar body are disposed inside the mold 30 through the inside of the mold 30 and the cooling line 40 is disposed inside the strand through the mold 30. The dummy bar head 61 is disposed inside the mold 30 .

When the dummy bar head 61 is disposed inside the mold 30, a sealant such as clay is used to fill the space formed between the inner wall of the mold 30 and the dummy bar head 61.

A first sealing member 110 and a second sealing member 120 are installed in the mold 30 to prevent contact between the molten steel supplied to the mold 30 and the dummy bar head 61, ). The first area 111 of the first sealing material 110 contacts the upper surface 61a of the dummy bar head 61 and the second area 112 contacts the upper surface 61a of the dummy bar head 61 The gap can be formed. The first seal member 110 may be provided on the bottom surface of the concave groove 62 of the dummy bar head 61. The first member 120a of the second sealing member 120 contacts the upper surface of the dummy bar head 61 or the other surface such as the upper surface of the first sealing member 110 while the second member 120b contacts the upper surface of the dummy bar head 61, 61b.

Here, when the first sealing material 110 is formed to have the same or similar size as the area of the upper surface 61a of the dummy bar head 61 and the area of the bottom surface, the upper surface 61a and the bottom surface The first sealing member 110 may be provided on each of the surfaces 61c.

8, when the first sealing member 110 is formed to have a size smaller than the area of the upper surface 61a of the dummy bar head 61, the first sealing members 110 are connected to the dummy bar head 61 ) Can be installed on the upper surface. At this time, the first sealing member 110 may be installed so that at least a part thereof overlaps. The second sealing member 120 may be formed by bonding the concave and convex structure 122 formed on the first member 120a to at least any one of the first region 111 to the fourth region 114 of the first sealing member 110 So that the second member 120b covers the inclined surface 61b of the dummy bar head 61. [ When the plurality of first sealing members 110 are stacked in this manner, a height difference may occur and the first area 111 of the first sealing member 110 may not contact the upper surface of the dummy bar head 61 If molten steel is injected thereafter, the first sealing material 110 may be pressed by the load of the molten steel to contact the upper surface of the dummy bar head 61.

The first sealing member 110 and the second sealing member 120 are provided in the mold 30 and then the first sealing member 110 and the second sealing member 120 are formed of a metal material, A third sealing member 130 may be additionally provided (see FIG. 2). The third sealing material 130 contacts the molten steel and the molten steel can rapidly solidify.

The first sealing member 110 and the second sealing member 120 are provided to prevent the contact between the molten steel and the dummy bar head 61 so that the use of the metal chip conventionally used to prevent the contact between the molten steel and the dummy bar head Can be excluded. Therefore, it is possible to suppress the contamination and damage of the equipment and the surface defects of the cast steel which are generated due to accumulation of the metal chips in the casting equipment around the casting equipment.

Thereafter, molten steel that has been refined in the steelmaking process is supplied to the mold 30 to cast the cast steel.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the following claims.

30: mold 60: dummy bar
61: dummy bar head 110: first sealing material
111: first area 112: second area
113: third region 114: fourth region
120: second sealing material 130: third sealing material
g: gap

Claims (14)

As a sealing device to be injected into a mold,
The dummy bar head is formed in a plate shape so as to cover at least a part of the upper surface of the dummy bar head inserted into the mold and at least one surface of the dummy bar head opposite to the dummy bar head And a first sealing material having a first area in contact with the top surface of the dummy bar head and a second area spaced from the top surface of the dummy bar head to form a gap,
Wherein the first sealing member is formed of a metal material. The method according to claim 1,
Wherein the first region and the second region extend in one direction. The method of claim 2,
Wherein the first region and the second region include at least one of a curved surface, an inclined surface, and a flat surface. The method according to claim 1,
Wherein the first region is formed to be surrounded by the second region. The method of claim 4,
Wherein the first area includes at least one of a curved surface, an inclined surface, and a plane,
Wherein the second region comprises a plane. The method according to any one of claims 1 to 5,
Wherein the first region and the second region are periodically or repeatedly provided on one surface of the first sealing member. The method of claim 6,
Wherein the first sealing member is provided in plural. The method of claim 7,
A third region having a shape corresponding to the first region and a fourth region having a shape corresponding to the second region on the other surface of the first sealing member. The method of claim 8,
Wherein the dummy bar head includes a concave groove,
Wherein the concave groove includes an inclined surface and a bottom surface connected to an upper surface of the dummy bar head,
And a second sealing member having a first member capable of being brought into contact with the upper surface of the dummy bar head or the first sealing member and a second member connected with the first member and capable of contacting with an inclined surface of the dummy bar head Sealing device. The method of claim 9,
Wherein the first member has a concavo-convex structure capable of contacting at least one region of the first region, the second region, the third region, and the fourth region on at least one surface thereof. Placing the dummy bar head inside the mold;
Providing a plate-shaped first sealing member capable of contacting at least a part of an upper surface of the dummy bar head;
Filling a space formed between the inner wall of the mold and the dummy bar head using a sealant; And
Injecting molten steel into the mold;
/ RTI >
The step of installing the first sealing material may include forming a gap by contacting the upper surface of the dummy bar head with at least a part of the first sealing material and separating at least a portion of the upper surface of the dummy bar head from the first sealing material. Lt; / RTI > The method of claim 11,
Wherein the first sealing member is provided in plurality,
Wherein the plurality of first sealing members are provided so as to overlap at least a part thereof,
Wherein the plurality of first sealing members are disposed so that overlapping portions are in close contact with each other. The method of claim 12,
Before the process of injecting molten steel,
And a second sealing member capable of contacting at least a slope provided on the dummy bar head. 14. The method of claim 13,
After the step of installing the second sealing material,
And a third sealing material having a shape of at least one of a coil shape and a wire shape.

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