KR101998747B1 - Sealing apparatus and casting method using the same - Google Patents

Abstract

The present invention provides a sealing apparatus having a sealing body having an area capable of covering a gap between a mold and a dummy bar head and a fixing unit provided at a lower portion of the sealing body and inserted into the gap, A sealing device and a casting method which can be easily used and removed and which can improve the sealing efficiency are proposed.

Description

Technical Field [0001] The present invention relates to a sealing apparatus and a casting method using the same,

The present invention relates to a sealing device and a casting method using the same, and more particularly, to a sealing device that can be easily used and removed and can improve sealing efficiency, and a casting method using the same.

The continuous casting facility is a facility for continuously casting a cast steel, which comprises a ladle for transporting molten steel, a tundish for receiving and storing the molten steel of the ladle, a mold for continuously solidifying molten steel supplied from the tundish, And cooling to perform a series of shaping operations while cooling the cast steel to be withdrawn.

In this case, since the mold has a structure in which the inside is opened upward and downward and there is no bottom surface, a dummy bar head is used to solidify the initial molten steel injected into the mold at the initial stage of continuous casting of the cast steel, do.

That is, at the initial stage of the continuous casting of the cast steel, a dummy bar head is inserted into the lower part of the casting mold to form a bottom surface of the casting mold. Then molten steel is injected into the casting mold and solidified for a predetermined time while being supported by a dummy bar head . Thereafter, the chain connected to the head of the dummy bar is pulled to start the continuous casting of the casting while pulling the dummy bar head and the chopsticks into the lower side of the casting mold. At this time, after the dummy bar head is inserted into the lower part of the mold, the gap between the mold and the dummy bar head is firstly sealed with a sealant, and then a chip and a coil are put on the dummy bar head to perform a sealing operation Complete. The sealing material prevents the molten steel from fusing to the dummy bar head, prevents the molten steel from leaking between the mold and the dummy bar head, and quickly cools the molten steel by first contacting the molten steel. do.

On the other hand, when the sealant is used as the clay as in the prior art, when the dummy bar head is removed from the chopping block after the continuous casting is started, the sealant remains in the dummy bar head and cooling zone, Lt; / RTI >

KR 10-2013-0131989 A

The present invention provides a sealing device capable of stably sealing a gap between a dummy bar head and a mold at the beginning of casting of the casting die using the casting mold, and a casting method using the same.

The present invention provides a sealing apparatus which can be easily used and removed and can improve sealing efficiency, and a casting method using the same.

A sealing apparatus according to an embodiment of the present invention is a sealing apparatus which is inserted into a mold and has a sealing body having an area capable of covering a gap between the mold and a dummy bar head inserted in the mold; And a fixing part provided at a lower portion of the sealing body and inserted into the gap.

The sealing body may be a shaped member extending along the gap.

The fixing portion may be an auxiliary member protruding from the lower surface of the sealing body or an auxiliary member formed to increase the height from the edge of the sealing body towards the center.

The auxiliary member may be manufactured integrally with the sealing body.

The sealing body may be formed in a bar shape, and the fixing portion may extend in the extending direction of the sealing body, and the width of the fixing portion may be smaller than the width of the sealing body.

The sealing body may have a width greater than a width of the gap so that at least a part of the sealing body overlaps with an upper surface of the dummy bar head.

At least one of the sealing body and the fixing portion may have an inclined surface on at least one side.

The sealing body and the fixture may comprise an aqueous compressible pulp material.

The sealing body and the fixing part may further include an inert material for delaying the start of combustion.

A casting method according to an embodiment of the present invention includes the steps of arranging a dummy bar head inside a mold; Inserting a sealing device along a gap between the mold and the dummy bar head; A step of injecting a sealing material into the mold; And injecting molten steel into the mold.

The process of inserting the sealing device may include: providing a sealing device extending in one direction; Cutting the sealing device along the shape of the mold and the dummy bar head; And inserting the cut sealing devices into the gap.

Wherein the sealing device includes a sealing body having an area capable of covering the clearance and a fixing portion provided at a lower portion of the sealing body, and the step of inserting the sealing device includes the step of inserting the fixing portion into the gap ; Superimposing the sealing body on a top edge of the dummy bar head; And contacting at least one of the fixing part and the sealing body with the inner wall of the mold.

At least one side of at least one of the sealing body and the fixing part is provided with an inclined surface, and the step of inserting the sealing device includes a step of bringing the inclined surface into close contact with at least one of the mold and the dummy bar head .

Withdrawing the dummy bar head along a lower draw path of the casting after the casting of the molten steel; And dissolving the sealing apparatus using cooling water sprayed on the drawing path.

And a process of suppressing or preventing the combustion of the sealing apparatus by using an inert material included in the sealing apparatus during the process of injecting the molten steel and drawing the dummy bar head.

According to the embodiment of the present invention, the gap between the dummy bar head and the mold can be stably sealed at the beginning of casting of the casting of the casting mold. At this time, since the sealing device includes a water-soluble pressed pulp material and is formed in a bar shape, it can be easily cut by cutting to the length of the gap and is easily dissolved by natural dissolution by cooling water. Accordingly, the burden on the operator can be drastically reduced as compared with the conventional work using the mud sealant. Further, the sealing device further includes an inert material, so that the start point of combustion due to the high temperature of the molten steel can be delayed, so that the gap can be stably sealed.

1 is a schematic view of a continuous casting plant according to an embodiment of the present invention.
2 is a schematic diagram showing a state in which a sealing apparatus according to an embodiment of the present invention is installed in a continuous casting facility.
3 is a schematic view of a sealing apparatus according to an embodiment of the present invention.
4 to 7 are schematic views for explaining the casting method of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, but may be embodied in various forms. It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS The drawings may be exaggerated for purposes of describing embodiments of the present invention, wherein like reference numerals refer to like elements throughout.

The sealing apparatus according to the embodiment of the present invention and the casting method using the same provide technical features that can be easily used and removed and can improve the sealing efficiency.

The sealing apparatus according to the embodiment of the present invention is applied to a continuous casting process of a steel mill, and can also be applied to various other melt casting processes. Hereinafter, embodiments of the present invention will be described with reference to a continuous casting process.

1 is a schematic view of a continuous casting plant according to an embodiment of the present invention.

1, the continuous casting facility includes a ladle 10 for conveying molten steel, a turn-dish 20 containing molten steel, an immersion nozzle 22 provided at the bottom of the turn-dish 20, a dipping nozzle 22 A cooling base 40 which is arranged in the casting direction on the lower side of the casting mold 30 and forms a path through which the casting stitches are pulled out, And a dummy bar 60 which is formed to be movable along the path where the side is drawn out and which is inserted into the mold 30 through the cooling stand 40.

The turn-dish 20 is a refractory container for temporary storage of molten steel, in which an outer surface of iron fat is formed and an inner surface is formed of a refractory material. The immersion nozzle (22) is mounted on the louver of the turn-dish (20) and connected to the interior of the turn-dish (20). The mold 30 has a hollow block shape in which upper and lower portions are opened, and the lower portion of the immersion nozzle 22 is disposed below the turn-dish 20. The casting mold 30 receives molten steel from the turn-dish 20 and first coagulates the casting mold.

The cooling stand 40 cools and presses the cast steel 1 continuously withdrawn from the casting mold 30, and performs a series of molding operations. The cooling stand 40 has segments 50, and the segments 50 are arranged in the casting direction to form a path through which the main body is drawn.

The cast strip 1 having passed through the cooling stand 40 is cut at a cut portion (not shown) and is conveyed to a rolling facility. On the other hand, the path through which the main part is drawn may be a vertically curved shape, but various shapes such as a vertical shape (not shown) and a curved shape (not shown) are possible.

The segments 50 include an upper frame and a lower frame, and guide rollers 58 are installed therebetween. The drawing of the cast strip 1 is guided by the guide rollers 58. The upper frame and the lower frame are fixed by guide roll assemblies 53 and 54, and press down the slab 1 using the pressurizing cylinders 55 and 56. Segments 50 have nozzles (not shown). The nozzle cools the cast steel by injecting cooling water into the cast steel (1).

The cast steel 1 is hardly moved by the magnetic force along the cooling stand 40 in the initial stage of continuous casting so that the cast steel 30 is moved into the casting mold and the cooling stand 40 before the molten steel is injected into the casting mold 30. [ . The dummy bars 60 serve to assist the start of the pulling of the cast strips 1.

The dummy bar 60 is connected to the dummy bar head forming the bottom surface in the mold 30 and the dummy bar head and is disposed inside the cooling stand 40 and is connected to the outlet And has a dummy bar body for pulling out the dummy bar head and the super slab connected to the dummy bar head. The dummy bar head may be a block shape, and the dummy bar body may be a chain structure.

The gap between the inner wall of the mold 30 and the head of the dummy bar must be sealed to prevent molten steel from flowing out between the mold 30 and the dummy bar head. That is, after the dummy bar head is inserted into the lower portion of the mold 30, the gap between the mold 30 and the dummy bar head is filled using the sealing apparatus according to the embodiment of the present invention, So as to prevent fusion with molten steel, molten steel is injected into the molten steel to form an ultra-slab in the mold 30.

The sealant blocks molten steel from contacting the dummy bar head directly within the mold 30. [ When the molten steel is injected, a part of the sealing material is melted by the heat of the molten steel, thereby lowering the temperature of the molten steel, so that the molten steel can be rapidly solidified into the molten steel. The normal main cutting edge can be continuously pulled out from the mold 30 after the main cutting edge is pulled out.

2 is a schematic diagram showing a state in which a sealing apparatus according to an embodiment of the present invention is installed in a continuous casting facility. 3 is a schematic view of a sealing apparatus according to an embodiment of the present invention.

3 (a), 3 (b) and 3 (c) are respectively a perspective view, a front view and a side view of the sealing device.

2 and 3, the sealing apparatus 700 according to the embodiment of the present invention is inserted into the mold 30 to seal the gap between the mold 30 and the dummy bar head 61 A sealing body 710 having an area capable of covering the gap between the mold 30 and the dummy bar head 61 and a sealing body 710 provided below the sealing body 710, And a fixing portion 720 which is inserted into the gap between the dummy bar heads 61.

In order to facilitate understanding of the embodiment of the present invention, the mold 30 and the dummy bar head 61 will be described first.

The upper and lower portions of the mold 30 are opened, and there is no bottom surface. Therefore, the bottom surface of the mold 30 is inserted by inserting the dummy bar head 61 into the lower portion of the mold 30 so that the molten steel can be received and coagulated in the mold 30 for a predetermined period of time.

The dummy bar head 61 serves to pull out the cast steel solidified in the casting mold 30 in the casting direction to start continuous casting of the casting. The dummy bar head (61) forms a bottom surface inside the mold (30). The dummy bar head 61 may be connected to a dummy bar body.

The dummy bar head 61 has an upper surface shape conforming to the internal area of the mold 30 so as to form the bottom surface of the mold 30. [ On the other hand, the dummy bar head 61 may be in the shape of a rectangular hexahedron. The dummy bar head 61 is formed with a concave groove (not shown) on its upper surface. The recessed groove prevents the main piece from being separated from the dummy bar head 61. [ The specific structure and shape of the dummy bar head 61 are not particularly limited in the examples. When the dummy bar head 61 is inserted into the lower portion of the mold 30, the sealing device 700 is inserted to seal the gap between the outer surface of the dummy bar head 61 and the inner wall of the mold 30. [

Thereafter, molten steel is injected into the mold 30. Molten steel injected into the mold 30 is solidified to form a meshed piece. And the dummy bar head 61 is connected to the dummy casting through the concave groove. The dummy bar head 61 and the chopsticks are taken out to start the continuous casting. Thereafter, the dummy bar head 61 is removed, and casting of the normal casting continues. The normal casting continuously drawn in the mold 30 is cut at the cut portion (not shown), and is transported to the collection point or directly to the equipment for the rolling process. Hereinafter, the sealing body 710 and the fixing portion 720 of the sealing device 700 according to the embodiment of the present invention will be described in detail.

The sealing body 710 may be a shaping member extending along the gap between the mold 30 and the dummy bar head 61, for example, a shaping member formed in a bar shape or a block shape. At this time, the shaping member means a member that is fixed in a predetermined shape. The shaping member can maintain a fixed shape by itself, so that the operator is easy to handle. Since the sealing body 710 is a compressed shaped member, it is easy and fast to install, and the sealing state can be firm.

The opposite of this is the atypical member. Examples of the non-rigid member include a sealant of a conventional clay material. In addition, the paper wire and the individual pulp strands also correspond to the non-rigid members. For example, the paper wire and the individual pulp strands can not resist bending or bending and can only hold a tensile force, which is also an irregular member because it can not maintain its own shape. The non-rigid member requires a relatively long time for the sealing operation, and the sealing state is also not robust.

The gap between the mold 30 and the dummy bar head 61 is referred to as "gap ". The sealing body 710 has an area covering the gap. The sealing body 710 may be formed so that its width is larger than the width of the gap so that at least a part of the sealing body 710 overlaps with the edge of the upper surface of the dummy bar head 61. [ The cross-section of the sealing body 710 may be in the shape of a trapezoid with a narrow base. Of course, the cross-sectional shape of the sealing body 710 need not be limited thereto.

The fixing portion 720 may be provided at a lower portion of the sealing body 710. The fixing portion 720 is inserted into the gap. The fixing portion 720 may be an auxiliary member protruding from the lower surface of the sealing body 710 or may be an auxiliary member formed to increase the height z from the edge of the sealing body 710 toward the center. At this time, the auxiliary member can be manufactured integrally with the sealing body 710.

The fixing portion 720 extends in the extending direction of the sealing body 710. The width W2 of the fixing portion 720 is formed to be smaller than the width W1 of the sealing body 710. [ Here, the width W1 of the sealing body 710 refers to the width of the upper surface, and the width W2 of the fixing portion 720 can refer to the width of the lower surface. The width of the lower surface of the fixing portion 720 is smaller than the width of the upper surface of the sealing body 710, for example. The cross-sectional shape of the fixing portion 720 may be a trapezoidal shape with a narrow base, but is not particularly limited thereto, and may be, for example, a downward convex shape.

At least one of the sealing body 710 and the fixing portion 720 may have an inclined surface on at least one side. In the embodiment, both the sealing body 710 and the fixing portion 720 have inclined surfaces on both sides thereof. The inclined surface serves to guide the fixing portion 720 to be inserted into the gap and serves to guide the sealing body 710 to be superimposed on the upper surface edge of the dummy bar head 61. [

By the structure of the sealing device 700 described above, the sealing device 700 can be fitted to the gap, and the sealing device 700 can be prevented from falling downward.

The sealing body 710 and the fixing portion 720 of the sealing apparatus 700 may include an aqueous compressible pulp material. Therefore, the sealing device 700 can be smoothly removed while the dummy bar head 61 is pulled out, without contacting the sealing device 700 with the cooling water and naturally melting.

In order to prevent the sealing body 710 and the fixing portion 720 from being burned by the high temperature of the molten steel in the mold 30, inertia for delaying the combustion start time of the sealing body 710 and the fixing portion 720 A material may be further included in the sealing body 710 and the fixing portion 720.

In the examples, "inert" is used to mean not reacting to combustion. That is, in the embodiment, the inert material is referred to as another flame-retardant material. On the other hand, the kind of the inert material is not particularly limited. The inert material may be, for example, pearlite powder or gypsum powder, and may be mixed with the sealing body 710 made of a pulp-type material and the fixing portion 720 so as to be easily shaped into a desired shape and strength, Any material can be used. The sealing body 710 and the fixing portion 720 may be a composite material including a compressed pulp material m1 and an inert material m2.

The extension length L of the sealing device 700 is not particularly limited. The sealing apparatus 700 may be provided at a length of several to several tens times longer than the total length of the length of the sides of the mold 30 in the long side direction X and the length of the sides of the short side direction Y, The sealing apparatus 700 can be used immediately by cutting it once or several times by a required length.

The sealing apparatus 700 is cut into a length of the long side direction X of the mold 30 and a length of the short side direction Y of the mold 30 respectively and further cut to fit the concave groove portion, Each of the sealing devices 700 is disposed so as to surround the edge of the dummy bar head 61, and then the cut sealing devices 700 are inserted into the gap to seal the gap.

4 to 7 are schematic views for explaining the casting method of the present invention.

4 (a) is a schematic view of a state in which a sealing material and a sealing device are put in a mold having a dummy bar head inserted therein, and Fig. 4 (b) Fig.

Fig. 5 is a schematic view of a section A-A 'in Fig. 4 (a), Fig. 6 is a schematic view of a section B-B' Lt; / RTI >

1 to 7, a casting method according to an embodiment of the present invention will be described in detail.

The casting method according to the embodiment of the present invention is characterized in that the dummy bar head 61 is disposed inside the mold 30 and the sealing device 60 is disposed along the gap e between the mold 30 and the dummy bar head 61. [ A process of inserting the sealing material 80 into the mold 30 and a process of injecting molten steel into the mold 30. [

And the dummy bar head 61 is disposed inside the mold 30. The bottom surface of the mold 30 is formed by the upper surface of the dummy bar head 61. At this time, the dummy bar body may be disposed on the cooling stand 40. After the dummy bar head 61 is disposed inside the mold 30, the sealing apparatus 700 is inserted along the gap e.

The process of inserting the sealing device 700 may include a process of providing a sealing device 700 extending in one direction, a process of forming a sealing device 700 along the inner wall of the mold 30 and the top edge of the dummy bar head 61, A process of cutting the apparatus 700, and a process of inserting the cut sealing devices 700 into the gap e. In this case, one direction is not a predetermined direction but a direction exemplified to explain that the sealing device 700 is elongated in one direction. That is, the sealing apparatus 700 is cut according to the extension length of the gaps e surrounding the dummy bar head 61, and the cut sealing apparatuses 700 are inserted into the gap e, . The process of inserting the cut sealing devices 700 into the respective gaps e will be described below. At this time, the sealing device 700 includes a sealing body 710 having an area covering the gap e, and a fixing portion 720 provided at a lower portion of the sealing body 710. Hereinafter, a process of inserting the sealing device 700 into the gap e with the structure of the sealing device 700 will be described.

The process of inserting the sealing device 700 is performed by inserting the fixing portion 720 into the gap e and superimposing the sealing body 710 on the upper edge of the dummy bar head 61, And at least one of the sealing body 710 and the sealing body 710 is brought into contact with the inner wall of the mold 30. At this time, the sealing apparatus 700 has, for example, a first side surface S1, a second side surface S2, an upper surface S3 and a bottom surface S4. The first side surface S1 and the second side surface S2 are inclined surfaces and are in close contact with the inner wall of the mold 30 and the upper surface edge of the dummy bar head 61, respectively.

Of course, at least one of the sealing body 710 and the fixing portion 720 is provided with at least one side surface that is sloped, and when inserting the sealing device, the sloped surface can be brought into close contact with at least one of the mold and the dummy bar head .

Thereafter, the sealing member 80 is inserted into the mold 30. The sealing material 80 may include a chip 81 and a coil 82. The sealing member 80 is formed of a metal material. The sealing member 80 is inserted to cover the upper surface of the dummy bar head 61 and the upper surface S3 of the sealing apparatus 700. [

Thereafter, molten steel is injected into the mold 30, molten steel is solidified in the mold 30, and the dummy bar head 61 is pulled out to start casting of the slab 1.

That is, after the molten steel is injected, the molten steel is solidified in the mold 30, the dummy bar head 61 is pulled out along the drawing path on the lower side of the mold 30, A process of dissolving the sealing apparatus 700 is performed using cooling water sprayed on the drawing path. Thus, the removal of the sealing apparatus 700 can be facilitated.

Meanwhile, during the process of drawing the dummy bar head 61 from the process of injecting the molten steel, it is possible to suppress or prevent the combustion of the sealing device 700 by using the inert material included in the sealing device 700, It is possible to stably seal between the inner wall of the mold 30 and the dummy bar head 61 until it is pulled out.

As described above, according to the sealing apparatus and the casting method using the sealing apparatus according to the embodiment of the present invention, the sealing apparatus 700 is formed of a compressed pulp material, and the sealing apparatus 700 is fixed And by compression molding, the wear of the copper plate of the mold 30 can be considerably reduced. Further, since the sealing apparatus 700 is spontaneously decomposed while being washed by the cooling water, the clogging shape of the nozzle of the cooling stand 40 can be minimized without remaining in the cooling stand 40. The clogging phenomenon of the nozzle is minimized, cooling efficiency is increased, and deterioration of the continuous casting equipment can be prevented.

Further, since the sealing device 700 is a shaping member, the sealing efficiency is excellent and the sealing operation is easy. At this time, since the sealing efficiency is excellent, the drawing operation of the cast steel can be facilitated, and the continuous casting equipment can be advanced.

The above-described embodiments of the present invention are for the explanation of the present invention and are not intended to limit the present invention. It should be noted that the configurations and the methods disclosed in the above embodiments of the present invention may be modified into various forms by combining or intersecting with each other, and such modifications may be considered within the scope of the present invention. That is, the present invention may be embodied in various forms within the scope of the claims and equivalents thereof, and it is possible for the technician skilled in the art to make various embodiments within the scope of the technical idea of the present invention. .

30: mold 61: dummy bar head
700: sealing device 710: sealing body
720: Fixed portion e: Clearance

Claims (15)

As a sealing device to be injected into a mold,
A sealing body having an area capable of covering a gap between the mold and a dummy bar head inserted in the mold; And
And a fixing part provided at a lower portion of the sealing body and inserted into the gap,
Wherein the sealing body and the fixing part are made of a composite material including a water-soluble compressed pulp material and an inert material powder that can be spontaneously dissolved and spontaneously decomposed by coming into contact with cooling water,
Wherein the sealing body has a top surface and both side surfaces extending in one direction, and the fixing portion has a bottom surface and both side surfaces extending in one direction. The method according to claim 1,
Wherein the sealing body is a shaped member extending along the gap. The method according to claim 1,
The fixing unit includes:
Wherein the auxiliary member is an auxiliary member protruding from the lower surface of the sealing body or is formed to increase in height from the edge of the sealing body toward the center. The method of claim 3,
Wherein the auxiliary member is manufactured integrally with the sealing body. The method according to claim 1,
The sealing body is formed in a bar shape,
Wherein the fixing portion extends in the extending direction of the sealing body,
Wherein a width of the fixing portion is smaller than that of the sealing body. The method according to claim 1,
Wherein the sealing body comprises:
Wherein a width of the gap is larger than a width of the gap so that at least a part of the upper surface of the dummy bar head overlaps with the upper surface of the dummy bar head. The method according to claim 1,
Wherein at least one of the sealing body and the fixing portion has an inclined surface on at least one side surface thereof. delete delete Placing the dummy bar head inside the mold;
A sealing device is provided which is a composite material having a lower surface extending in one direction, an upper surface and both side surfaces, contacting with cooling water, spontaneously dissolving and spontaneously decomposing, and containing water-soluble compressed pulp material and inert material powder, Inserting the sealing device along a gap between the dummy bar heads;
A step of injecting a sealing material into the mold; And
And injecting molten steel into the mold,
After the molten steel is injected,
Withdrawing the dummy bar head along a lower draw path of the mold;
And dissolving and disassembling the sealing apparatus using cooling water sprayed on the drawing path,
During the process of injecting the molten steel and withdrawing the dummy bar head,
And inhibiting or preventing the combustion of the sealing device using the inert material powder. The method of claim 10,
The process of inserting the sealing device comprises:
Cutting the sealing device along the shape of the mold and the dummy bar head; And
And inserting the cut sealing devices into the gap. The method of claim 10,
Wherein the sealing device includes a sealing body having an area capable of covering the gap, and a fixing portion provided at a lower portion of the sealing body,
The process of inserting the sealing device comprises:
Inserting the fixing portion into the gap;
Superimposing the sealing body on a top edge of the dummy bar head;
And contacting at least one of the fixing portion and the sealing body to the inner wall of the mold. The method of claim 12,
At least one side surface of at least one of the sealing body and the fixing portion is provided with an inclined surface,
The process of inserting the sealing device comprises:
And adhering the slope to at least one of the mold and the dummy bar head. delete delete

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