KR101839254B1 - Apparatus for Controlling the flows of Continuous Casting - Google Patents

Abstract

According to the present invention, an apparatus for controlling a flow of a continuous casting process comprises: a yoke formed to surround the circumference of a mold; a core extending toward an immersion nozzle inserted into the mold from the yoke; a coil wound around the circumference of the core; and a core block extending toward the immersion nozzle from the core, and having a cross-sectional area smaller than that of the core.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting process,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control apparatus for molten steel, and more particularly, to a flow control apparatus for a continuous casting process for controlling the flow of molten steel in a mold using an electromagnetic force so that a stable playing operation can be performed.

The continuous casting method is to continuously carry out a series of processes such as injection, casting, rolling and cutting of molten steel. In this continuous casting method, the yield and energy efficiency are advantageous compared with the general roughing method and the effect of reducing the manpower is required, but the casting speed needs to be increased to improve the productivity. In particular, the development of a continuous casting system capable of rapid casting speeds of about 4 to 8 m / min is possible due to the development of continuous continuous rolling through one-to-one direct connection of performance-rolling in thin slabs of thickness less than 150 mm Is required.

At the time of high-speed casting, a large amount of molten steel flows into the narrow mold through the immersion nozzle, so that the flow in the mold can be intensified. For example, the inflow of abrupt molten steel can intensify the excessive fluctuation of the molten metal surface and the deviation of the molten metal surface.

Excessive swinging of the bath surface causes non-uniform growth of the solidification layer because it causes uneven supply of the mold flux, which serves as lubricating and heat transferring between the mold and the casting. In addition, the excessive swinging of the bath surface causes the surface of the cast steel and internal defects, which interferes with the formation of a uniform solidification cell, as well as causes safety accidents.

In order to solve the above problems, a flow control device using an electromagnetic force has been developed. The flow control device using the electromagnetic force suppresses the fluctuation of the molten steel in the mold by using the Lorentz force acting in the direction opposite to the flow direction by the action of the induction current.

However, such an induction control apparatus has a problem that an electromagnetic force is applied also to the vicinity of the immersion nozzle to increase the flow velocity of the molten steel near the immersion nozzle. In order to solve such a problem, the applicant has developed Patent Document 2. However, the invention disclosed in Patent Document 2 requires a coil to be formed in a semicircular iron core, so that it is difficult to actually apply the coil in the field.

For reference, Patent Documents 1 and 2 are the prior art related to the present invention.

KR 2016-0115141 A KR 1999-0052839 A

SUMMARY OF THE INVENTION It is an object of the present invention to provide a flow control apparatus for a continuous casting process capable of stably controlling a swinging phenomenon of a molten metal discharged from an immersion nozzle.

According to an aspect of the present invention, there is provided a flow control apparatus for a continuous casting process, including: a yoke configured to surround a periphery of a mold; A core extending from the yoke toward an immersion nozzle that is drawn into the mold; A coil wound around the core; And a core block extending from the core toward the immersion nozzle and having a cross sectional area smaller than that of the core.

In the flow control apparatus of the continuous casting process according to an embodiment of the present invention, the length of the core block is larger than 1/2 of the distance from the end of the core to the center of the immersion nozzle.

The distance from the end of the core block to the center of the immersion nozzle in the flow control apparatus of the continuous casting process according to an embodiment of the present invention is smaller than the length of the core block.

In the flow control apparatus of the continuous casting process according to an embodiment of the present invention, a plurality of fitting holes are formed in the core so as to fit the core block.

In the flow control device of the continuous casting process according to an embodiment of the present invention, the fitting hole is formed in a lattice shape at the end of the core so that a plurality of core blocks can be inserted.

In the flow control apparatus of the continuous casting process according to an embodiment of the present invention, the yoke is formed with a coupling hole configured to fit the core.

In the flow control apparatus of the continuous casting process according to an embodiment of the present invention, the core block is configured to generate an electromagnetic force at a portion spaced apart from the immersion nozzle.

In the flow control apparatus of the continuous casting process according to an embodiment of the present invention, the core block has a cross sectional area increasing toward the center.

The present invention can stably control molten steel discharged from immersion nozzles of different shapes by providing a DC magnetic field that effectively controls the flow of molten steel during continuous casting of thin slabs, thereby increasing the productivity of continuous thin slab casting As well as enhancing the performance of the performance, it is also possible to carry out continuous operation through direct connection of performance-rolling.

1 is a schematic view of a flow control device of a continuous casting process according to an embodiment of the present invention
Fig. 2 is a plan view of the flow control device shown in Fig.
Fig. 3 is a side view of the flow control device shown in Fig. 2
Fig. 4 is a graph showing the magnetic field distribution in the core cross section shown in Fig. 3
5 is a graph showing the magnetic field distribution in the core block cross section shown in Fig. 3
Fig. 6 is an enlarged perspective view of the core and core block shown in Fig.
Fig. 7 is an exemplary view showing a mode that can be implemented by the core and the core block shown in Fig. 6
8 is a perspective view showing another form of core and core block;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing the present invention, it is to be understood that the terminology used herein is for the purpose of describing the present invention only and is not intended to limit the technical scope of the present invention.

In addition, throughout the specification, a configuration is referred to as being 'connected' to another configuration, including not only when the configurations are directly connected to each other, but also when they are indirectly connected with each other . Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

1, a flow control apparatus for a continuous casting process according to an embodiment will be described.

The flow control apparatus 100 of the continuous casting process according to an embodiment includes the yoke 110, the core 120, the coil 130, and the core block 140. However, the configuration of the flow control device 100 is not limited to the above-described members. For example, the flow control apparatus 100 may further include a power source for supplying current to the coil 130. [

The yoke 110 is formed to surround the periphery of the mold 200. For example, the yoke 110 may be formed in a rectangular shape resembling a transverse section of the mold 200. However, the shape of the yoke 110 is not limited to a rectangular shape. For example, it is also possible to change the shape of the yoke 110 to a circle, an ellipse, a pentagon, or the like. The yoke 110 is configured to form a magnetic path. For example, the yoke 110 may be made of a conductive material to form a magnetic path around the mold 200. The yoke 110 thus configured can concentrate the electromagnetic field on the mold 200 and block the leakage magnetic flux.

The yoke 110 is configured to engage the core 120. For example, the yoke 110 may be formed with one or more engagement holes 112 through which the core 120 can be inserted. The plurality of engagement holes 112 are formed to face each other. Accordingly, the cores 120 disposed in the respective engaging holes 112 may be arranged symmetrically with a predetermined gap therebetween.

The core 120 is coupled to the yoke 110. In other words, the core 120 may be formed integrally with the yoke 110 by being fitted in the coupling hole 112 of the yoke 110, as described above.

The core 120 is configured to form a magnetic field in an area including the mold 200. For example, the core 120 may form a magnetic path to form a magnetic field passing through the mold 200 at one side of the yoke 110 and moving to the other side of the yoke 110.

The core 120 may be fabricated generally in the form of a prism. For example, the core 120 may extend from the yoke 110 toward the mold 200 and may be in the form of a rectangular parallelepiped extending in the width direction of the mold 200. However, the shape of the core 120 is not limited to a rectangular parallelepiped. For example, the core 120 may be formed into a cylindrical shape or a columnar shape.

The coil 130 may be disposed around the core 120. For example, the coil 130 may be wound around the core 120 so that an induction current may be formed around the core 120. [

The core block 140 may be disposed in the core 120. For example, the core block 140 may be disposed at the end of the core 120. The core block 140 is configured to focus the magnetic field formed by the core 120 to a specific portion of the mold 200. For this, the core block 140 may be formed to be smaller than the cross-sectional area of the core 120.

The core block 140 may guide the electromagnetic field to be concentrated at a portion located at a predetermined distance from the immersion nozzle 210 (see FIG. 2). For example, the core block 140 is formed in a semicircle shape surrounding the discharge port side of the immersion nozzle 210 as shown in FIG. 1, so that a weak magnetic field is formed in the immersion nozzle 210 and the vicinity thereof, 210 to generate a strong magnetic field. 1, the core block 140 is shown in a semicircle shape, but the shape of the core block 140 is not limited to a semicircle.

The core block 140 may be configured to facilitate coupling and disconnection with the core 120. For example, the core block 140 may be configured to be assembled or detached from the fitting hole formed in the end portion of the core 120. [

The flow control device 100 of the continuous casting process configured as described above can minimize the swinging phenomenon of the bath surface through the magnetic field formed through the core block 140.

Next, the arrangement of the core and the core block of the flow control device and the immersion nozzle will be described with reference to FIGS. 2 and 3. FIG.

In the flow control device 100 according to the present embodiment, the core block 140 may be disposed at a predetermined distance from the immersion nozzle 210. For example, the first distance G from the end of the core block 140 to the center of the immersion nozzle 210 is less than the length L of the core block 140 (hereinafter referred to as the first condition).

In the flow control device 100 according to the present embodiment, the core block 140 may have a predetermined length. For example, the length L of the core block 140 is smaller than the second distance D from the end of the core 120 to the center of the immersion nozzle 210. Preferably, the length L of the core block 140 is smaller than the second distance D and larger than 1/2 of the second distance D (hereinafter referred to as a second condition). Such numerical limitation of the core block 140 is advantageous for forming a magnetic field distribution substantially similar to the cross-sectional shape of the core block in the mold 200. In other words, if the length L of the core block 140 does not satisfy the second condition, the magnetic field induced by the core block 140 is smaller than the magnetic field induced by the core 120, Can not be realized. On the contrary, if the length L of the core block 140 satisfies the second condition, since the magnetic field induced by the core block 140 is larger than the magnetic field induced by the core 120, It is possible to realize a magnetic field distribution substantially corresponding to the cross-sectional shape of the magnetic field.

Figures 4 and 5 show the magnetic field distributions induced by the core and the core block.

At the periphery of the core 120, a rectangular magnetic field distribution substantially conforming to the cross-sectional shape of the core 120 is formed. In contrast, a semicircular magnetic field distribution substantially conforming to the cross-sectional shape of the core block 140 is formed around the core block 140.

However, if the distance G from the end of the core block 140 to the immersion nozzle 210 does not satisfy the first condition described above, the magnetic field induced by the core block 140 becomes weak, It is difficult to realize a magnetic field distribution matching the shape. Similarly, if the length L of the core block 140 does not satisfy the second condition described above, the magnetic field induced by the core 120 is strong, so that a magnetic field distribution conforming to the cross-sectional shape of the core 120 can be formed have.

It is preferable that the distance G from the end of the core block 140 to the immersion nozzle 210 and the length L of the core block 140 satisfy the first condition and the second condition described above.

Next, a coupling structure between the core and the core block of the flow control device according to one embodiment will be described with reference to FIG.

The core 120 and the core block 140 are configured to facilitate separation and coupling. For example, the core 120 may have a plurality of insertion holes 122 through which the core block 140 can be inserted. The fitting hole 122 is formed at the end of the core 120 and may be formed at a predetermined interval along the height and width direction of the core 120. For example, the plurality of fitting holes 122 may be arranged in a lattice form. The fitting hole 122 may be in the form of a hole having a generally rectangular cross section. However, the cross-sectional shape of the fitting hole 122 is not limited to a square. For example, the cross section of the fitting hole 122 may be changed to a circle, an ellipse, a triangle, a pentagon, or the like.

The core block 140 is configured to be fit into the fitting hole 122. For example, the core block 140 may be a prismatic column having a cross-sectional shape that coincides with the fitting hole 122. The core block 140 may have a considerable length. For example, the core block 140 may have a length such that the length of the core block 140 excluding the portion fitted in the fitting hole 122 can satisfy the second condition. The core block 140 can be freely disposed in any of the fitting holes 122. For example, the plurality of core blocks 140 may be selectively disposed in the lattice-shaped fitting holes 122 to implement the semicircular or other shape shown in Fig.

Since the flow control device 100 of the continuous casting process configured as described above is free to separate and couple the core block 140, the cross-sectional shape of the core block 140 can be freely changed according to the size and shape of the immersion nozzle 210 So that the distribution of the magnetic field near the immersion nozzle 210 can be adjusted.

Next, the cross-sectional shape of the core block and the effect therefrom which can be implemented by the core and the core block having the features described above will be described with reference to FIG.

The core block 140 may be modified into various shapes as shown in Figs. 7 (a) to 7 (d). For example, the core block 140 may be deformed into a shape such as a semicircle, a crook, a crescent moon, a side-lying umbrella, or the like. In addition, the core block 140 may have a thick middle portion. For example, the core block 140 may be changed into a shape in which the cross-sectional area increases toward the center portion.

The core block 140 constructed as described above concentrates the magnetic field at the outer portion of the immersion nozzle 210 to smooth the supply of the mold flux 220 in the mold 200 as shown in FIG. 240 can be induced uniformly.

Next, Fig. 8 illustrates another form of core and core block.

The core 120 and the core block 140 may be integrally formed as shown in FIG. For example, the core 120 and the core block 140 may be formed as one body and not separated.

The core 120 and the core block 140 can be distinguished by the size of the cross-sectional area. For example, the core 120 is a portion having a substantially rectangular cross-section, and the core block 140 may be a portion having a cross-sectional area smaller than that of the core 120 while having a substantially semicircular cross-section.

Since the core 120 and the core block 140 constructed as described above are integrally formed, the core 120 and the core block 140 can be easily manufactured.

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 inventions And various modifications may be made. For example, various features described in the foregoing embodiments can be applied in combination with other embodiments unless the description to the contrary is explicitly stated.

100 (in continuous casting process)
110 yoke
112 (of yoke) engaging hole
120 cores
122 (of the core)
130 coils
140 core block
200 mold
210 Immersion nozzle

Claims (8)

A yoke configured to surround the periphery of the mold;
A core extending from the yoke toward an immersion nozzle that is drawn into the mold;
A coil wound around the core; And
A core block extending from the core toward the immersion nozzle, the core block having a cross sectional area smaller than that of the core;
/ RTI >
Wherein a length of the core block is larger than a half of a distance from an end of the core to a center of the immersion nozzle and is greater than a distance from an end of the core block to a center of the immersion nozzle. delete delete The method according to claim 1,
And the core has a plurality of fitting holes configured to fit the core block. 5. The method of claim 4,
Wherein the fitting hole is formed in a lattice shape at an end of the core so that a plurality of core blocks can be inserted. The method according to claim 1,
And the yoke is provided with a coupling hole configured to fit the core. The method according to claim 1,
Wherein the core block is configured to generate an electromagnetic force at a portion spaced apart from the immersion nozzle. 8. The method of claim 7,
Wherein the core block has a cross-sectional area increasing toward a central portion thereof.

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