KR101389860B1 - Apparatus for Mold sealing and Method for manufacturing continuous slab - Google Patents

Abstract

The present invention relates to a mold sealing material used in a continuous casting apparatus, and more particularly, to a mold sealing material and a continuous casting method using the mold sealing material so that solidification of molten steel injected into the mold rapidly proceeds. The present invention provides a mold sealing material disposed in a casting connection groove of a dummy bar head inserted in a mold, the structure comprising a plurality of frames having a length connected to each other, And a plurality of coil springs attached to the frame frame. The frame frame includes a first body frame and a second body frame which are opposed to each other in pairs and face each other, a body mediating frame which connects the body frames to each other, Band support frame and a second cooling band support frame.

Description

[0001] The present invention relates to a mold sealing material and a continuous casting method,

The present invention relates to a mold sealing material used in a continuous casting apparatus, and more particularly, to a mold sealing material and a continuous casting method using the mold sealing material so that solidification of molten steel injected into the mold rapidly proceeds.

In general, a continuous casting apparatus is produced in a steelmaking furnace, molten steel fed to a ladle is supplied to a tundish, and supplied to a mold whose lower side is opened through an immersion nozzle installed at the lower portion of the tundish, .

The molten steel supplied to the mold is cast into a cast steel having a predetermined width and thickness while being cooled through the segment equipment. Since such a cast can not be smoothly transferred to the curved portion of the lower portion of the mold and the end of the segment equipment only by its own weight, a dummy bar is connected to the end of the casting, and the cast is pulled out from the mold and the segment.

At the beginning of the performance, the dummy bar is pulled out of the mold while being inserted into the inside of the mold. The dummy bar is provided with a dummy bar head connected to the casting at its front end, and then a plurality of dummy bar bodies And is connected through a connection link. The dummy bar head at the front end closes the lower end of the mold to prevent molten steel from flowing out, while being connected to the dummy bar head in a state where the main body is solidified, thereby enabling drawing.

Between the mold and the dummy bar head is provided a mold sealing material which strengthens the solidification of the molten steel so as to prevent molten steel from flowing out between the mold and the gap of the dummy bar head. The mold sealing material includes a sealant for blocking a gap between the mold and the dummy bar head, a cooling band for cooling the molten steel injected into the mold, a coil for rapidly accelerating the solidification of the molten steel injected into the mold, A coil spring and the like are provided. As shown in FIG. 1, a mold sealing case (300) in which a plurality of coil springs are arranged on a plane is provided on the molten steel contact surface of the dummy bar head. In addition, a plurality of coil springs 200 are randomly inserted into the casting connection groove A of the dummy bar head by an operator, and molten steel is injected into the mold. The molten steel formed in the dummy bar head in the mold is combined with the mold sealing case 300 and the coil spring 200 formed in the casting connection groove A to further strengthen the solidification.

However, since a plurality of coil springs 200 inserted into the cast steel connection groove A are arbitrarily placed in the steel casting connection groove A by the operator, the following problems arise.

There is a problem that the preparation time is delayed because the number of the coil springs is so large that it is injected into the casting connection groove. In addition, there is a problem that the coil spring injected into the casting connection groove is not fixed, and the position of the coil spring is changed when the molten steel is injected, so that the molten steel is not solidified smoothly. In addition, since the number of coil springs is set to be one, the insertion of coil springs in the mold during sealing work differs for each worker. Therefore, since the shape of the coil springs is different in each worker, the molten steel can not be solidified quickly and may flow into the gap between the dummy bar head and the mold gap. Further, there is a problem that the coil springs are not uniformly distributed but are concentrated to the inside of the cast steel connection groove, and the flow of molten steel is concentrated at the edge of the mold at the beginning of casting.

Korean Patent Publication No. 10-2011-0105149

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to facilitate the solidification of molten steel without flowing off the molten steel at the initial stage of casting. Another object of the present invention is to shorten a working time for feeding a coil spring into a casting connection groove of a mold. Further, the technical problem of the present invention is to uniformly distribute the coil spring in the casting connection groove. Another object of the present invention is to fix the cooling band without moving when molten steel is injected into the mold. Another object of the present invention is to prevent work deviations between workers when a coil spring is inserted into a spiral connection groove.

The present invention provides a mold sealing material disposed in a casting connection groove of a dummy bar head inserted in a mold, the structure comprising a plurality of frames having a length connected to each other, And a plurality of coil springs attached to the frame frame.

The frame frame includes a first body frame and a second body frame which are opposed to each other in pairs and face each other, a body mediating frame which connects the body frames to each other, Band support frame and a second cooling band support frame.

Each body frame has a 'C' shape having two long sides connecting two short sides, each cooling band support frame has a 'T' shape having a longitudinal side and a side length, and the longitudinal side is connected to the long side do.

The coil spring includes a body outer coil spring attached to the outside of the body frame along the longitudinal axis, a cooling band supporting coil spring connecting the first cooling band support frame and the second cooling band support frame, And a body inner coil spring which connects the body mediating frame and the long axis side and is attached to the inside of the body frame. The cooling band support coil springs connect the sides of each cooling band support frame to each other.

According to another aspect of the present invention, there is provided a method of manufacturing a dummy bar, comprising the steps of: inserting a dummy bar having a dummy bar head at its front end into the inside of a mold; And drawing the cast steel.

According to the embodiment of the present invention, it is possible to prevent the mold from flowing down by strengthening the solidification of the molten steel. Further, according to the embodiment of the present invention, it is possible to shorten the working time for feeding the coil spring into the casting connection groove of the mold. Further, according to the embodiment of the present invention, because of the standardized integrated type of the coil spring inserted into the thread connecting groove, it is possible to eliminate work deviation between the workers. According to the embodiment of the present invention, it is possible to prevent the molten steel, which has been concentrated at the edge of the mold at the beginning of casting, from flowing down.

1 is a photograph showing a state in which a plurality of coil springs are individually inserted into a casting connection groove of a mold.
2 is an overall perspective view of a typical continuous casting apparatus.
3 is a perspective view of a dummy bar head.
4 is a perspective view of a frame frame according to an embodiment of the present invention.
5 is a photograph showing a coil spring attached to a frame frame according to an embodiment of the present invention.
FIG. 6 is a photograph showing a state in which the frame frame according to the embodiment of the present invention is inserted into the casting connection groove.

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. 2 is an overall perspective view of a general continuous casting apparatus, and FIG. 3 is a perspective view of a dummy bar head.

Referring to the drawings, a ladle 20 provided in a ladle turret 10 is filled with molten steel whose impurities are removed and chemical components are adjusted, and molten steel in the ladle 20 is filled with a cylindrical refractory brick And is poured into a tundish 30 through a nozzle made of stainless steel.

Molten steel stored in the tundish 30 is injected into the mold 40 through an immersion nozzle 32 made of a cylindrical refractory brick and is cast into a slab on a base plate by a mold. Since the mold 40 is provided with a cooling mechanism therein, the molten steel is cooled while the molten steel flows therein, and the cast steel 50 having a cross section corresponding to the cross section of the mold 40 is cast.

The mold (40) of the continuous casting apparatus has no bottom, unlike the casting mold. Therefore, when the molten steel is injected into the casting mold 40, a floor is required to prevent the molten steel from being exposed. In this case, the dummy bar 60 is used. The leading end portion of the dummy bar 60, that is, the portion corresponding to the bottom of the mold is called a dummy bar head 70, and the initial molten steel is solidified at this portion and joined to the dummy bar 60 and pulled out by the conveying roller 80 .

The first molten steel flowing into the mold 40 flows into the mold 40 through the concave and convex portions of the dummy bar head 70. In other words, A plurality of feed rollers 80 installed on the movement path are driven to move the dummy bar 60 between the upper and lower rollers to which the coagulated cast bill 50 is injected so that the cooling water is injected, .

In the dummy bar 60, a dummy bar head 70 connected to the casting is provided at the front end, and then a plurality of dummy bar bodies are connected through a connecting link. The upper surface of the dummy bar head 70 at the front end closes the lower end of the mold to prevent molten steel from flowing out, while being connected to the dummy bar head 70 in a state where the main body is solidified,

When the dummy bar head 70 is separated from the dummy bar 60, the dummy bar head 70 and the dummy bar head 70 are separated from each other .

2 showing a perspective view of the dummy bar head, a surface 71 (hereinafter referred to as a molten steel contact surface) between the dummy bar head and the molten steel in the mold is provided with an effective connection between the molten steel injected into the mold and the dummy bar head, A casting connection groove 72 is formed to prevent separation of the dummy bar head and casting. The billet connection groove 72 has a cross section of the dummy bar head and a structure of a stepped groove.

A steel piece such as a chip is sprayed on the molten steel contact surface 71 of the dummy bar head so as to be combined with the solidification casting of the mold so that the casting can be easily separated after completion of the casting drawing operation.

In other words, the mold 40 of the continuous casting apparatus is not bottomed, unlike the ingot mold. Therefore, when the molten steel is injected into the casting mold 40, a bottom is required to prevent the molten steel from being exposed. The leading end portion of the dummy bar 60, that is, the portion corresponding to the bottom of the mold is called a dummy bar head 70, and the initial molten steel is solidified at this portion and joined to the dummy bar 60 and pulled out by the conveying roller 80 .

However, if the molten steel is directly welded to the contact surface where the dummy bar head 70 contacts the cast steel 50, it becomes difficult to separate the solidified cast steel and the dummy bar head 70. Therefore, A metal chip such as a nail chip and a grinder chip for improving the cooling of the molten steel at the upper portion of the dummy bar head, and a sealing member for sealing the gap between the molds 40, A mold sealing operation is performed in which the mold sealing material is seated on the molten steel contact surface of the dummy bar head 70 so as to be able to proceed quickly.

Mold sealing is a process to prevent the molten steel from leaking out during the work to connect the dummy bar and the cast in the initial preparation work during the casting operation. When the molten steel flows into the mold through the immersion nozzle in the tundish, the molten steel is allowed to stay for a certain period of time, thereby preventing the molten steel from flowing down to the lower portion and changing the molten steel into the molten steel using the coolant.

Here, the mold sealing material used for the mold sealing operation is to prevent the gap between the copper plate and the dummy bar of the casting machine mold and to make the initial molten steel coagulate through the coolant and to prevent the drawing from affecting the drawing. The mold sealing material includes a sealant for blocking a gap between the mold and the dummy bar head, and a cooling band for cooling the molten steel injected into the mold. In addition, a coil spring for rapidly accelerating the solidification of the molten steel injected into the mold is provided.

The embodiment of the present invention includes a frame frame attached with coil springs uniformly arranged so that the frame frame is inserted into the casting connection groove so that the coil spring is disposed in the casting connection groove. Conventionally, as shown in FIG. 1, a plurality of (for example, ten) coil springs must be inserted into the bobbin connecting grooves one by one, so that the working time is delayed. Moreover, the inserted coil spring is not fixed, Interfere. In order to solve such a problem, a frame frame is provided, a coil spring is attached to the frame frame, and the frame frame is inserted into the casting connection groove 72.

FIG. 4 is a perspective view of a frame frame according to an embodiment of the present invention, wherein FIG. 4 (a) is a front perspective view and FIG. 4 (b) is a side perspective view. 5 is a photograph showing a coil spring attached to a frame frame according to an embodiment of the present invention. FIG. 5 (a) is a front view and FIG. 5 (b) is a side view.

The frame frame 100 is formed by connecting a plurality of frames having a length smaller than the internal space of the feed connection groove of the dummy bar head. The frame frame is a structure to be inserted into the casting connection groove, and the operator places the frame frame in the casting connection groove. Therefore, the frame frame is formed so as to be smaller than the internal space of the feed connection groove.

A plurality of coil springs are attached to the outer side of the frame frame through welding or the like. Thus, when the frame frame is inserted into the casting connection groove, the coil spring is inserted into the casting connection groove.

The frame frame includes a body frame 110, a body medial frame 120, and a cooling band support frame 130. Hereinafter, a frame refers to a rectilinear bar or a rectilinear (or curved) film replacement having a length as curved. A material having a melting point higher than that of molten steel is used as the material of the frame frame and the coil spring.

The body frame 110 includes a first body frame 111 and a second body frame 112 and has a structure in which two body frames 111 and 112 face each other and face each other. The first body frame 111 has a form of a 'C' structure having two short axes 111a and 111c and a long axis 111b connecting them. This is also true of the second body frame 112.

The first body frame 111 and the second body frame 112 are formed such that the major axis 111b of the first body frame and the major axis 112b of the second body frame are opposed to each other and the minor axis 111a And 111c of the second body frame and the uniaxial sides 112a and 112c of the second body frame are opposed to each other. The angle between the uniaxial side and the major axis side may be formed to be perpendicular to each other, or may have an obtuse angle shape larger than 90 degrees. In addition, the long axis sides 111b and 112b may be formed as two long axis parallel to each other.

The body mediating frames 120 (121, 122) connect and fix the first body frame 111 and the second body frame 112 facing each other to each other. The body frame 120 may be connected to the body frame 110 by welding or may be integrally formed.

Each of the cooling band support frames 131 and 132 has a T shape formed by longitudinal sides 131a and 132a and lateral sides 131a and 132b and a longitudinal side 131a of the first cooling band support frame 131 And the longitudinal side 132a of the second cooling band support frame 132 is connected to the longitudinal side 112b of the second body frame 112. The longitudinal side 132b of the first cooling band support frame 132 is connected to the longitudinal side of the first body frame 111b. For reference, the long axis side and the short axis side of the cooling band support frame serve as a frame for supporting the cooling band, and the cooling band is placed on the cooling band support frame after the frame frame is inserted into the casting connection groove. Therefore, when the molten steel is injected into the mold, the cooling band can be fixed without shaking to accelerate the solidification of the molten steel, so that the molten steel can be prevented from flowing to the edge of the inside of the mold.

The coil spring includes a body outer coil spring 221 attached to the frame, a cooling band supporting coil spring 223, and a body inner coil coil 222.

The body outer coil springs 221 (221a, 221b) are attached to the outside of the body frame along the long axis sides 111b, 112b of each body frame. That is, the body outer coil springs 221a and 221b are attached from one end to the other end of the longitudinal axes 111b and 112b of the body frames 111 and 112, respectively. Such attachment can be done by welding or the like, or the body outer spring and the body frame can be prefabricated in advance.

The cooling band support coil spring 223 is positioned to connect between the first cooling band support frame 131 and the second cooling band support frame 132. One end of the transverse side 131b of the first cooling band support frame 131 and one end of the transverse side 132b of the second cooling band support frame 132 are connected by a cooling band supporting coil spring 223. Therefore, the bottom surface of the cooling band can be supported by the cooling band supporting coil spring 223.

The body inner coil springs 222 222a and 222b connect the body center frame 120 and the longitudinal sides 111b and 112b of the body frame 110 and are attached to the inside of the body frame. Here, the inside of the body frame refers to the inside facing each other when the two pairs of body frames oppose each other and face each other. The body inner coil spring 222 has an inclined direction and protrudes up to the height of the transverse sides 131b and 132b of the cooling band support frame 130. [

FIG. 6 is a view showing a state in which the frame frame according to the embodiment of the present invention is inserted into the casting connection groove, wherein the coil spring attached to the frame frame is uniformly arranged in the casting connection groove. As a result, the mold sealing material, which is a frame frame to which the coil spring is attached, is integrally provided with a cooling band support frame for reinforcing the out side surface. Instead of putting a single coil spring many times, Time can be shortened. In addition, due to the standardized integrated improvement, it is possible to eliminate individual variation according to the working method.

Meanwhile, according to the embodiment of the present invention, it is possible to perform continuous casting by using the mold sealing material integrally manufactured. First, a dummy bar formed with a dummy bar head at the front end is inserted into the inside of the mold. By inserting the dummy bar into the inside of the mold, the lower end of the mold can be sealed. The dummy bar head is provided with a stepped groove connecting groove in the form of a stepped groove to strengthen the bonding force between the molten steel entering the mold and the dummy bar head.

Thereafter, there is a process of positioning a mold sealing material integral with the casting connection groove of the dummy bar head. A mold sealing material is provided in the casting connection groove to strengthen solidification of molten steel. A cooling band is placed on top of the mold sealant, which can cool molten steel injected into the mold.

After the molding of the mold sealing material and the cooling bands is completed, the mold sealing material is placed and then the dummy bar is sunk in the mold to pull out the cast. That is, the first molten steel that flows into the mold solidifies along the convex and concave portions of the dummy bar head, moves along the plurality of conveying rollers provided on the movement path, and moves between the upper and lower rollers through which the dummy bars are injected, The main part is manufactured.

As a result, according to the embodiment of the present invention, the integral mold sealing material can be injected into the bobbin connecting groove at a time, so that a uniform batch operation can be performed and the working time can be shortened.

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.

110: body frame 111: first body frame
112: second body frame 120: body mediation frame
130: cooling band support frame 131: first cooling band support frame
132: second cooling band support frame

Claims (8)

A mold sealing material disposed in a casting connection groove of a dummy bar head inserted in a mold,
A first body frame and a second body frame opposed to each other and facing each other, a body mediating frame connecting the body frames to each other, a pair of first cooling band support frames opposed to each other and connected to the body frames, 2. A structure for connecting cooling band support frames to each other, the frame frame being inserted into an internal space of the feed connection groove;
And a plurality of coil springs attached to the frame frame,
Each body frame has a 'C' shape having long sides connecting two short sides, each cooling band support frame having a 'T' shape having longitudinal and transverse sides, Connected,
The coil spring includes a body outer coil spring attached to the outside of the body frame along the longitudinal axis, a cooling band supporting coil spring positioned between the first cooling band support frame and the second cooling band support frame, And a body inner coil spring connected to the body mediating frame and the long axis side and attached to the inside of the body frame. delete delete delete The mold sealing member according to claim 1, wherein the cooling band supporting coil springs connect the lateral sides of the respective cooling band support frames to each other. The mold sealing material according to claim 1, wherein the body inner coil spring has an inclined orientation. A step of inserting a dummy bar having a dummy bar head in the front end thereof into the inside of the mold;
Positioning a mold sealing material integral with the casting connection groove of the dummy bar head;
A process in which the dummy bars are pulled out from the mold at the time of drawing the slabs;
/ RTI >
Wherein the mold sealing material comprises:
A first body frame and a second body frame opposed to each other and facing each other, a body mediating frame connecting the body frames to each other, a pair of first cooling band support frames opposed to each other and connected to the body frames, 2. A structure for connecting cooling band support frames to each other, the frame frame being inserted into an internal space of the feed connection groove;
And a plurality of coil springs attached to the frame frame,
Each body frame has a 'C' shape having long sides connecting two short sides, each cooling band support frame having a 'T' shape having longitudinal and transverse sides, Connected,
The coil spring includes a body outer coil spring attached to the outside of the body frame along the longitudinal axis, a cooling band supporting coil spring positioned between the first cooling band support frame and the second cooling band support frame, And a body inner coil spring connected to the body intermediate frame and a longitudinal axis side and attached to the inside of the body frame. The continuous casting method according to claim 7, wherein a cooling band for cooling the molten steel injected into the mold is placed on top of the mold sealing material.

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