KR20120053745A - Mold capable of changing width thereof during continuous casting and continuous casting process using the same - Google Patents

Abstract

PURPOSE: A mold capable of changing the width thereof during continuous casting and a continuous casting method using the same are provided to reduce working hours by rapid width control and to manufacture various sizes of slab. CONSTITUTION: A mold for continuous casting comprises a pair of fixing members(100), a pair of first moving members(200), a pair of second moving members, and a driving unit. The pair of fixing members are arranged facing each other at a certain interval. The first moving members are arranged between the fixing members and allowed to move back and forth. The second moving members are arranged between the fixing members, close to the bottom of the first moving members, and allowed to move back and forth. The driving unit drives the first and second moving members. The first and second moving members move during casting in which molten steel is provided.

Description

Mold capable of changing the width during continuous casting and continuous casting method using the same {Mold capable of changing width etc during continuous casting and continuous casting process using the same}

The present invention relates to continuous casting, and more particularly, to a continuous casting mold capable of changing the casting width of up to 1000 mm during casting and a continuous casting method using the same.

In general, the continuous casting process continuously injects molten steel into a mold of a predetermined shape, and continuously melts the molten steel reacted in the mold to the lower side of the mold, thereby forming a variety of slabs, blooms, billets, and the like. It is the process of manufacturing the semi-finished product of shape. The mold is made of a constant shape by the reaction of the injected molten steel by circulating the cooling water therein.

The mold consists of a pair of long side plates and short side plates, which face each other, and moves along the width of the slab to be produced. In other words, in order to produce cast slabs of the desired width, the width of the casting needs to be changed, and in order to change the width of the casting in the mold, the short side plate is moved from the outside to the inside, or from the inside to the outside, before the casting. You will change the spacing between the plates. However, the method of controlling the width of the cast steel using such a mold has to move the short side plate before casting, and the short side plate moves very slowly, so that the casting width can only be changed at a maximum of 50-100 mm in the actual process. I can't show it. In addition, there is a fear that an operation accident occurs as the width change time proceeds very slowly.

On the other hand, after adjusting the width of the short side plate, the dummy bar is charged between the long side plate and the short side plate in the mold, the dummy bar is provided about 15mm less than the space in the mold. Therefore, there is a small gap between the dummy bar, the long side plate and the short side plate, the gap should be filled to seal the mold.

As described above, in order to adjust the width of the cast using the mold, the short side plate is moved to adjust the gap between the short side plates, the dummy bar is inserted into the mold, and the sealing work is performed. Each time a product is produced, it must be carried out in accordance with the specifications of each product. However, the dummy bar insertion and sealing work is time-consuming, resulting in an unnecessary increase in the number of days of production. In addition, since the insertion and sealing of the dummy bar is a very precise and detailed work, the worker's attention is required, thereby reducing the progress of the process smoothly.

The present invention provides a continuous casting mold capable of changing the casting width and continuous casting and a continuous casting method using the same.

The present invention provides a continuous casting mold and a continuous casting method using the same that can change the casting width of up to 1000mm or more during continuous casting.

Continuous casting mold according to an embodiment of the present invention comprises a pair of fixing members spaced apart from each other; A pair of first moving members disposed between the fixing members so as to be movable forward and backward; A pair of second moving members disposed between the fixing members so as to be movable forward and backward and closely disposed at a lower end of the first moving member; And driving means for driving the first and second moving members, respectively, wherein the first and second moving members are moved during casting to which molten steel is supplied.

The fixing member maintains an interval corresponding to the thickness of the cast steel, and the first and second moving members move at intervals corresponding to the width of the cast steel.

The forward and backward movements of the first and second moving members are in a horizontal direction and a horizontal direction of the fixing member, and the second moving member moves to the moving distance of the first moving member after the first moving member is moved. .

The fixing member and the first and second moving members form a space in which molten steel is injected.

Continuous casting mold according to another embodiment of the present invention is a pair of long side plate is installed corresponding to the long side of the cast steel to be manufactured; It is provided with a pair of short side plates correspondingly installed on the short side of the slab, and the pair of short side plates are divided into a plurality of movable parts along a direction in which molten steel is injected and passed.

And moving means for moving the divided short side plates back and forth in the long side direction of the cast steel.

The continuous casting method according to another embodiment of the present invention provides a mold provided with a pair of fixing members facing each other and a first and a second moving member which is divided and adhered in a direction in which molten steel is introduced and passed between the fixing members. Becoming; Injecting molten steel into the mold; Lowering the height of the molten steel to change the width by moving the first moving member; And changing the width by moving the second moving member after re-inserting the molten steel.

And adding coolant prior to re-charging the molten steel.

The second moving member is moved at the same distance as the first moving member.

According to the present invention, a mold is provided in which a first and a second moving member in close contact with each other in a vertical direction between opposite fixing members are provided, and the first moving member is moved by a driving means to maintain a gap corresponding to the width of the slab during casting. After the movement, the second moving member is moved to cause the molten steel to react.

Therefore, the casting width can be changed during casting, the quick width can be changed, the operation time can be shortened, and the casting width can be changed more than 1000 mm, so that casting of various sizes is possible.

In addition, the dummy bar charging and sealing work is not necessary, thereby reducing the operating time and a smooth process. In addition, since the length of the cast steel that cannot be used, such as ultra cast steel and horse cast, is greatly reduced, the error rate of the cast steel can be significantly increased.

1 is a schematic view of a continuous casting apparatus to which the present invention is applied.
2 and 3 are a plan view and a longitudinal sectional view of the mold for continuous casting according to the present invention.
Figure 4 is a process flow diagram according to the width control of the mold for continuous casting according to the present invention.
5 is a process flow diagram according to the narrow control of the mold for continuous casting according to the present invention.

Hereinafter, exemplary 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 disclosed below, but may be implemented in various forms, and only the embodiments of the present invention to complete the disclosure of the present invention, those skilled in the art It is provided to fully inform the category. Like numbers refer to like elements in the figures.

1 is a schematic diagram of a continuous casting apparatus to which the present invention is applied, and FIGS. 2 and 3 are plan and longitudinal cross-sectional views of a mold for continuous casting according to the present invention.

Referring to FIG. 1, a continuous casting apparatus to which the present invention is applied may include a ladle 10 containing molten steel 1 refined in a steelmaking process, and an injection nozzle connected to the ladle 10. Tundish 20 for temporarily storing the molten steel 1 through the immersion nozzle 30 for discharging the molten steel 1 from the tundish 30, including the exposure opening 35, and immersion. A mold 40 and a mold 40 capable of receiving the molten steel 1 by the nozzle 30 to initially solidify the molten steel 1 into a predetermined cast 2 shape and to change the casting width during casting. It includes a cooling line 50 provided in the lower portion of the plurality of segments 52 are continuously arranged to perform a series of molding operations to cool the unsolidified molten steel (1) to form the cast steel (2) . The segment 52 is sprayed with cooling water so as to solidify to the inside of the slab 2 while preserving the shape of the cast slab 2, and a plurality of rollers 54 for drawing the slab 2 are provided.

As shown in FIGS. 2 and 3, the mold 40 includes a pair of fixing members 100 provided to face each other, and a pair of first members provided between the fixing members 100 so as to face each other and move in a horizontal direction. A pair of second movable members 300 which face each other between the movable member 200 and the fixed member 100 and are movable in the horizontal direction and are in close contact with the first movable member 200 in a vertical direction; First and second drive means 400, 500 for moving the first and second moving members 200, 300, respectively. The mold 40 is provided in a substantially hexahedral shape in which the upper and lower portions are opened by the fixing member 100 and the first and second moving members 200 and 300, and a space is provided therein, and the molten steel 1 is formed therein. Will be injected. In addition, the fixing member 100 is manufactured to have a substantially rectangular plate shape to face each other, and the fixing member 100 maintains an interval corresponding to the short side length, that is, the thickness, of the slab 2 to be manufactured. That is, the fixing member 100 corresponds to the long side plate. In addition, the first and second moving members 200 and 300 correspond to the short side plates. On the other hand, the cooling water flows into the fixing member 100 to cool the molten steel 1 to be in a reaction state.

The first moving members 200a and 200b are provided to face each other between the fixing members 100. The first moving member 200 is moved in the horizontal direction by the first driving means 400, and the distance between the first moving member 200 corresponding to the long side length, that is, the width of the slab 2 to be manufactured This is regulated. That is, the first moving member 200 is moved back and forth with the fixing member 100 in the horizontal direction by the first driving means 400 so that the interval thereof is adjusted in correspondence with the long side length of the slab 2 to be manufactured. Can be. The first movable member 200 may include support plates 210a and 210b and 210, contact plates 220a and 220b spaced apart from the support plate 210 by a predetermined distance and in contact with the molten steel 1. It is provided in the space between the support plate 210 and the contact plate 220 and includes a cooling flow path (230a, 230b; 230) through which the coolant flows. The support plate 210 may be made of SUS material, for example, and the contact plate 220 may be made of copper material. Here, the support plate 210 is manufactured in a substantially hexahedral shape, and the contact plate 220 is provided to surround at least three surfaces of the support plate 210. Therefore, it cools from the part of the molten steel 1 which contacts the contact plate 210 by the cooling water which flows into the cooling flow path 230, and the molten steel 1 will be in a solid state. That is, the molten steel 1 in a molten state is cooled while passing between the first moving members 200 to form a solidified shell in a reaction state. As a result, the first moving member 200 not only adjusts the spacing corresponding to the long side length, that is, the width of the slab 2 to be manufactured, but also cools the molten steel 1 first.

The second moving members 300a and 300b 300 are provided in close contact with the first moving member 200 under the first moving member 200. The second moving member 300 is moved in the horizontal direction with the fixing member 100 by the second driving means 500 after the first moving member 200 is moved to adjust the long side length, that is, the width, of the slab 2. It moves forward and backward and maintains the same distance as that of the first moving member 200. That is, the molten steel 1 is cooled not only by the first moving member 200 but also by the second moving member 300 and the gap is adjusted in correspondence to the long side length of the cast steel 2 to be manufactured. This second moving member 300 serves to support the solidified shell to withstand iron static pressure. In addition, the height of the second moving member 300 in the vertical direction may be higher than the height of the first moving member 200. However, the second moving member 300 may be manufactured in the same width as that of the first moving member 200. In addition, the second moving member 300 may be provided in the same structure as the first moving member 200. That is, the second moving member 300 may include the support plates 310a and 310b and 310, and the contact plates 320a and 320b 320 which are spaced apart from the support plate 310 by a predetermined distance and in contact with the molten steel 1. And cooling paths 330a, 330b and 330 provided in the spaced space between the support plate 310 and the contact plate 320. The support plate 310 may be made of, for example, SUS material, and the contact plate 320 may be made of, for example, copper material.

The first and second driving means 400, 500 are coupled to the first and second moving members 200, 300, respectively, to individually drive the first and second moving members 200, 300. Further, the first and second driving means 400 and 500 are coupled to each of the pair of first and second moving members 200 and 300, respectively, so that the pair of first and second moving members 200 and 300 respectively. To move the same distance. The first and second drive means 400, 500 may comprise a cylinder, for example, which may be directly connected with the support plates 210, 310 of the first and second moving members 200, 300. The first and second moving members 200 and 300 move forward and backward in the horizontal direction with the fixing member 100 by the first and second driving means 400 and 500. To adjust the distance between the (200, 300), the long side length of the slab (2) can be adjusted accordingly.

As described above, the mold for continuous casting according to the embodiment of the present invention includes the first and second moving members 200 and 300 in close contact with each other in the vertical direction, and the long side length, that is, the width, of the slab 2 during casting. After the first moving member 200 is moved to maintain the interval corresponding to the second moving member 300 is moved to react the molten steel (1). Therefore, the casting width can be adjusted during casting, and the first and second moving members 200 and 300 can be moved quickly by the first and second driving means 400 and 500, thereby reducing the operating time. have. In addition, it is possible to change the casting width of 1000mm or more so that it is possible to produce casts of various sizes. In addition, the dummy bar charging and sealing work is not necessary, thereby reducing the operating time and a smooth process.

4 is a process flow chart for explaining an example of a continuous casting method using a continuous casting mold according to an embodiment of the present invention, a process for adjusting the width of the cast steel.

The immersion nozzle 30 during casting in the mold 40 provided with a pair of fixing members 100 facing each other and the first and second moving members 200 and 300 in close contact with each other in the vertical direction between the fixing members 100. When the molten steel 1 is supplied through the molten steel 1, the molten steel 1 is cooled in the mold 20 by the cooling water flowing through the first and second moving members 200 and 300 to become a solid state. Subsequently, as shown in FIG. 4 (a), the molten steel 1 has a height lower than the first moving member 200 to a predetermined height. For example, the height of the molten steel 1 is lowered to be equal to or lower than the height of the upper surface of the second moving member 300. Then, the first moving member 200 is moved to the outside by a distance corresponding to the length of the long side, that is, the width, of the slab 2 to be manufactured by using the first driving means 400. The distance is widened. Subsequently, as shown in FIG. 4 (b), the coolant 3 is introduced onto the molten steel 1. When the coolant 3 is supplied to the molten steel 1 in the solid state through the immersion nozzle 30, the molten steel 1 in the molten state is supplied by the molten steel 1 in the molten state. Since molten steel 1 can be melted again, the molten steel 1 is injected in order to solidify rapidly. The coolant 3 may include metal chips such as nail chips and grinder chips to improve cooling of molten steel in a molten state, and a cooling coil to allow solidification of molten state to proceed rapidly. . Subsequently, as shown in FIG. 4C, molten steel 1 in a molten state is supplied into the mold through the immersion nozzle 30. Subsequently, while the molten steel 1 is drawn downward as shown in FIG. 4 (d), the second driving means 500 is used by the second moving member 300 by the interval between the first moving members 200. To the outside. At this time, even if the second moving member 300 moves to the outside, since the mold flux (not shown) is injected when the molten steel 1 is injected, the separation between the second moving member 300 and the molten steel 1 can be easily performed. do. That is, the mold flux prevents the surface of the molten steel 1 from being exposed to the atmosphere to be oxidized or lowered in temperature, and controls the heat transfer between the molten steel 1 and the mold 40 as well as reacting to the lower side of the mold 40. Since the lubrication ability is improved to facilitate the drawing of the molten steel 1 in a high state, even if the second moving member 300 is moved, the second moving member 300 and the molten steel 1 can be separated. In this manner, as shown in FIGS. 4E and 4F, when the molten steel 1 is pulled downward, a slab 2 having a wide width can be manufactured.

5 is a process flow chart for explaining an example of a continuous casting method using a continuous casting mold according to an embodiment of the present invention, a process for narrowing the cast steel will be described.

As shown in FIG. 5A, a mold provided with a pair of fixing members 100 facing each other and the first and second moving members 200 and 300 in close contact with each other in the vertical direction between the fixing members 100 ( When the molten steel 1 is supplied through the immersion nozzle 30 during casting in the 40, the molten steel 1 is formed in the mold 20 by the coolant flowing through the first and second moving members 200 and 300. It cools and becomes a solid state. Subsequently, as shown in FIG. 5B, the molten steel 1 has a height lower than that of the first moving member 200, for example, the height of the upper surface of the second moving member 300. Lower the height of the hot water surface of the molten steel 1. Then, the first moving member 200 is moved between the first moving member 200 by moving inward at a distance corresponding to the long side length, that is, the width, of the slab 2 to be manufactured by using the first driving means 400. Will narrow the distance. Subsequently, the coolant 3 is introduced onto the molten steel 1 as shown in FIG. 5C, and then molten steel 1 in the molten state through the immersion nozzle 30 as shown in FIG. 5D. It is supplied into this mold. Subsequently, while the molten steel 1 is drawn downward as shown in FIG. 5 (e), the distance between the second movable member 300 and the first movable member 200 as shown in FIG. 5 (f) is shown. As much as the second drive means 500 is moved to the outside. When the molten steel 1 is pulled out in this way, the slab 2 whose width is adjusted narrowly can be manufactured.

The embodiments and drawings attached to this specification are merely to clearly show some of the technical ideas included in the present invention, and those skilled in the art can easily infer within the scope of the technical ideas included in the specification and drawings of the present invention. Modifications that can be made and specific embodiments will be apparent that both are included in the scope of the invention.

100: fixing member 200: first moving member
300: second moving member 210, 310: support plate
220, 320: contact plates 230, 330: cooling flow path
400, 500: driving means

Claims (11)

A pair of fixing members spaced apart from each other;
A pair of first moving members disposed between the fixing members so as to be movable forward and backward;
A pair of second moving members disposed between the fixing members so as to be movable forward and backward and closely disposed at a lower end of the first moving member; And
Drive means for respectively driving said first and second moving members,
And the first and second moving members are moved during casting in which molten steel is supplied.
The mold for continuous casting according to claim 1, wherein the fixing member maintains an interval corresponding to the thickness of the cast steel.
The mold for continuous casting according to claim 1 or 2, wherein the first and second moving members move at intervals corresponding to the width of the cast steel.
The mold for continuous casting according to claim 3, wherein the forward and backward movements of the first and second moving members are horizontal to the longitudinal direction of the fixing member.
The mold for continuous casting according to claim 4, wherein the second moving member moves at a moving distance of the first moving member after the first moving member is moved.
The mold for continuous casting according to claim 1, wherein the fixing member and the first and second moving members form a space in which molten steel is injected.
As a mold for continuous casting,
A pair of long sides installed corresponding to the long sides of the cast steel to be manufactured;
A pair of short side plates provided corresponding to the short side of the cast piece,
The pair of short side plates may be divided into a plurality of movable molds along the direction in which molten steel is injected and passed.
8. The mold for continuous casting according to claim 7, further comprising moving means for moving the divided short side plates back and forth in the longitudinal direction of the cast steel.
Providing a mold having a pair of fixing members facing each other and first and second moving members which are divided and adhered in a direction in which molten steel is introduced and passed between the fixing members;
Injecting molten steel into the mold;
Lowering the height of the molten steel to change the width by moving the first moving member; And
Moving the second moving member to change the width after re-inserting the molten steel.
10. The method of claim 9 further comprising the step of introducing a coolant prior to re-charging the molten steel.
10. The continuous casting method according to claim 9, wherein the second moving member is moved at the same distance as the first moving member.

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