JP2022545965A - Casting equipment and casting method - Google Patents

Abstract

A casting facility and casting method capable of controlling the flow of a melt are provided. Kind Code: A1 The present invention relates to casting equipment and a casting method, and includes a process of injecting a melt into a mold using a nozzle, and forming a static magnetic field applied area and a static magnetic field unapplied area in the width direction of the mold. to control the flow of the melt along the length of the mold, and withdrawing the slab through which the flow of the melt contained within the vessel is locally controlled. Thereby, the cleanliness of the melt can be ensured and the quality of the product can be improved. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a casting facility and a casting method, and more particularly, to a casting facility and a casting method capable of improving the quality of products by controlling the flow of the melt to ensure cleanliness of the melt. .

Generally, in the continuous casting process, molten steel is poured into a mold having a fixed internal shape, and the semi-solidified slab in the mold is continuously pulled out to the bottom of the mold to form slabs, blooms, billets, and beams. Various shaped slabs such as blanks can be produced. The surface quality and internal quality of the slab manufactured in this manner are affected by various factors, and in particular, the surface quality of the slab is greatly affected by the flow of molten steel in the mold.

When a molten material is injected into a mold using an immersion nozzle in a continuous casting process, the molten material discharged from the outlet of the immersion nozzle flows in the width direction of the mold while forming a jet stream. The molten material flowing in the width direction of the mold collides with the inner surface of the mold, for example, the inner surface of the short-side plate, and partly forms an upward flow and partly forms a downward flow. Then, the upward flow moves from near the surface of the melt toward the center of the mold, for example, the side where the immersion nozzle is arranged. The melt moving toward the center of the mold in this way collides with the melt moving in opposite directions and the immersion nozzle to form a vortex near the melt surface around the immersion nozzle. to destabilize the flow of the hot water surface. At this time, the faster the upward flow velocity, the more unstable the flow of the melt on the surface of the melt. substances are mixed into the melt.

In addition, the downward flow flows downward along the periphery of the mold and forms a secondary upward flow rising from the center of the mold. At this time, the inclusions contained in the molten steel move along the downward flow in the casting direction, float along the secondary upward flow, flow into the mold slag or mold flux, and can be removed. However, the movement distance of the inclusions varies depending on the flow velocity of the downward flow, and when the flow velocity of the downward flow is high, the inclusions penetrate into the solidified shell, causing surface defects in the cast slab produced thereafter. There is an inconvenience that it will end up.

In order to solve this problem, a method is used in which a magnetic field generator is arranged in the mold to control the flow of molten steel in the mold. This method controls the upward flow near the surface of the molten steel to suppress the mold flux from flowing into the molten steel, and controls the downward flow from the bottom of the immersion nozzle to control the movement distance of inclusions. It suppresses the occurrence of surface defects in pieces. However, in the process of controlling the downward flow, a phenomenon occurs in which the formation of a secondary upward flow caused by the downward flow is also suppressed. As a result, there is the inconvenience that the inclusions that have moved in the casting direction along the downward flow do not float normally and remain in the molten steel, still deteriorating the quality of the cast slab.

Korean Patent No. 10-1176816 Japanese Patent No. 4411945

SUMMARY OF THE INVENTION The present invention provides a casting facility and casting method capable of controlling melt flow.

INDUSTRIAL APPLICABILITY The present invention provides a casting facility and casting method capable of smoothly removing inclusions contained in a melt, suppressing contamination of different substances into the melt, and improving product quality. I will provide a.

A casting facility according to an embodiment of the present invention is a casting facility that casts a slab, and includes a mold that provides a space in which the melt can be stored, and an upper part of the mold for supplying the melt to the mold. a static magnetic field generator arranged outside in the width direction of the mold so as to control the direction of the magnetic field in different directions at both peripheral edge portions in the width direction of the mold; and a controller capable of controlling the operation of the magnetic field generator.

The mold includes a pair of long-side plates spaced apart and a pair of short-side plates connecting both sides of the pair of long-side plates, respectively. a plurality of static magnetic field generators arranged in the width direction of the long side plate under the nozzle so as to be spaced apart from the center, and passing through the mold in the thickness direction on both sides of the nozzle in the width direction of the mold. and a first current supplier capable of supplying direct current to the plurality of static magnetic field generators to form a magnetic field.

Each of the plurality of static magnetic field generators includes a core extending along a part of the width direction of the long side plate and arranged to be separated from each other, and a coil wound around the outside of the core. may

The plurality of static magnetic field generators are arranged in one of the first static magnetic field generators such that the nozzle is disposed between the first static magnetic field generator and the first static magnetic field generator. a second static magnetic field generator spaced apart to the side; a third static magnetic field generator disposed so as to face the second static magnetic field generator; and a third static magnetic field generator. A fourth static magnetic field generator spaced apart to one side of the third static magnetic field generator and disposed facing the first static magnetic field generator such that the nozzle is disposed between and a magnetic field generator, wherein the first current suppliers form mutually opposite polarities in the directions facing each other in the thickness direction of the mold, and form mutually opposite polarities in the width direction of the mold, A DC current may be supplied to the first static magnetic field generator, the second static magnetic field generator, the third static magnetic field generator and the fourth static magnetic field generator.

The first static magnetic field generator and the second static magnetic field generator are separated by a first distance, and the third static magnetic field generator and the fourth static magnetic field generator are separated , are separated by a second distance, and the first distance and the second distance may be equidistant.

The first distance and the second distance may be 4 to 36 when the overall width of the slab is 100.

At least one of the first static magnetic field generator, the second static magnetic field generator, the third static magnetic field generator, and the fourth static magnetic field generator extends in the width direction of the mold. may be arranged to be movable along the

The casting equipment includes a first connecting core for connecting the first static magnetic field generator and the second static magnetic field generator, the third static magnetic field generator and the fourth static magnetic field. and a second coupling core for coupling with the generator.

The static magnetic field generator may generate a magnetic field that rotates in the circumferential direction of the mold.

The casting equipment includes a moving magnetic field generator disposed above the static magnetic field generator and capable of forming a moving magnetic field to control the flow of the melt, and the controller controls the strength of the moving magnetic field and It may be possible to control the operation of the moving magnetic field generator so as to adjust at least one of the directions.

The moving magnetic field generator may include a plurality of moving magnetic field generators capable of forming a moving magnetic field in the width direction of the mold on both sides of the nozzle.

The moving magnetic field generator may be arranged alongside a static magnetic field generator and capable of controlling the flow of the melt in a different direction than the static magnetic field generator.

A casting method according to an embodiment of the present invention includes a step of casting a melt into a mold using a nozzle, and forming a static magnetic field applied region and a static magnetic field non-applied region in the width direction of the mold, and controlling the flow of the melt in a vertical direction; and withdrawing the billet.

The casting method includes the step of arranging the nozzle at the center in the width direction of the mold before the step of casting the melt, and the step of controlling the flow of the melt includes: A process of forming a static magnetic field non-applied area in the center and forming the static magnetic field applied areas on both sides of the static magnetic field non-applied area may be included.

The step of controlling the flow of the melt may include forming the static magnetic field applied region and the static magnetic field non-applied region below the nozzle.

The step of controlling the flow of the melt includes the step of forming a static magnetic field along the thickness direction of the mold, and the step of forming the static magnetic field application region is formed on both sides of the nozzle in the width direction of the mold. A step of forming a static magnetic field such that the directions of the magnetic fields are formed in opposite directions may be included.

The step of controlling the flow of the melt may include the step of forming the static magnetic field non-applied area in a part of the widthwise central portion of the mold where the nozzle is arranged.

The step of controlling the flow of the melt may include the step of controlling the range of the static magnetic field applied region so that the static magnetic field non-applied region has a magnetic field of 0 to 100 Gauss.

The step of controlling the flow of the melt may include adjusting the distance between the static magnetic field application regions according to the width of the billet.

In the process of controlling the flow of the melt, the static magnetic field application regions are formed at both peripheral edge portions in the width direction of the mold to reduce the flow velocity of the downward flow of the melt, and between the static magnetic field application regions forming the static magnetic field non-applied region to form an upward flow of the melt.

The step of controlling the flow of the melt further includes forming a moving magnetic field applied region and a moving magnetic field non-applied region in the width direction of the mold to control the flow of the melt in the width direction of the mold. You can stay.

The step of controlling the flow of the melt in the width direction of the mold includes forming a moving magnetic field applied region and a moving magnetic field non-applied region between the surface of the melt and the lower end of the nozzle. good too.

The step of forming the moving magnetic field applying region may include forming a moving magnetic field in the width direction of the mold on both sides of the nozzle in the width direction of the mold.

The step of forming the moving magnetic field application area may include adjusting at least one of strength and direction of the moving magnetic field.

According to embodiments of the present invention, the flow of the melt contained within the vessel can be locally controlled. That is, the static magnetic field can be selectively applied across the width of the mold to selectively control the flow of the melt along the length of the mold. Therefore, it is possible to reduce the distance that the inclusions contained in the melt move downward along the melt, and to facilitate the upward movement of the inclusions, thereby suppressing deterioration of product quality due to the inclusions. In addition, by forming a moving magnetic field in the width direction of the mold and controlling the flow of the melt near the surface of the melt, it is possible to prevent different substances such as mold flux and mold slag from being mixed into the melt. can be suppressed. Through this, the cleanliness of the melt can be ensured and the quality of products manufactured using the melt can be improved.

1 is a perspective view of casting equipment according to an embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view of the casting facility taken along line A-A' shown in FIG. 1; FIG. 4 is a diagram for explaining the principle of controlling the flow of melt using a static magnetic field generator; Sectional drawing of the casting equipment which concerns on the modification of this invention. The figure which shows the state which controls the flow of a molten material by the casting method which concerns on embodiment of this invention. FIG. 5 is a diagram showing analysis results of a secondary ascending flow in a mold depending on whether or not a static magnetic field non-applied region is formed in the width direction of the mold; FIG. 2 is a cross-sectional view of the casting facility taken along line B-B' shown in FIG. 1; FIG. 4 is a diagram showing an example of controlling the flow of a melt using a moving magnetic field generator;

Hereinafter, embodiments of the present invention will be described in more detail based on the accompanying drawings. The present invention, however, is not intended to be limited to the embodiments disclosed below, but may be embodied in a variety of different forms and merely these embodiments should provide a complete disclosure of the invention and general knowledge. It is provided to fully inform the owner of the scope of the invention. In describing the present invention, like reference numerals denote like elements, and the drawings may be partially exaggerated in size to accurately describe the embodiments of the present invention. , like reference numerals refer to like elements.

1 is a perspective view of a casting facility according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the casting facility along line A-A' shown in FIG.

1 and 2, a casting facility according to an embodiment of the present invention includes a mold 100 that provides a space for the melt to be contained therein, and a mold 100 at least partially for supplying the melt to the mold 100. and a nozzle 130 disposed outside in the width direction of the mold 100 so as to control the direction of the magnetic field in different directions at both peripheral edges in the width direction of the mold 100. A static magnetic field generating section 200 and a control section 400 capable of controlling the operation of the static magnetic field generating section 200 may be provided.

The mold 100 may comprise a plurality of plates 110, 120 to provide a space within which the melt, eg molten steel, is contained. At this time, the plurality of plates 110 and 120 may include long side plates 110 and short side plates 120 .

The long-side plate 110, for example, the first long-side plate 111 and the second long-side plate 113 are arranged to face each other while being separated from each other, and the short-side plate 120, for example, the first short-side plate The plate 121 and the second short-side plate 123 are arranged to contact both sides of the first long-side plate 111 and the second long-side plate 113 to form a space in which the molten material is stored. can be done. At this time, the upper and lower portions of the mold 100 may be opened, and the long-side plate 110 and the short-side plate 120 may be brought into close contact with each other so that the melt does not flow out to the contact portion.

Here, the horizontal length of the long-side plate 110 is called the width of the long-side plate 110, and the direction thereof is called the width direction of the long-side plate 110. As shown in FIG. At this time, the width direction of the long side plate 110 may mean the width direction of the mold 100 . The vertical length of the long-side plate 110 is called the length of the long-side plate 110, and the direction thereof is called the lengthwise direction of the long-side plate 110. As shown in FIG. At this time, the longitudinal direction of the long side plate 110 may mean the longitudinal direction of the mold 100 or the drawing direction of the slab. The horizontal length of the short-side plate 120 is called the width of the short-side plate 120, and the direction thereof is called the width direction of the short-side plate 120. As shown in FIG. At this time, the width direction of the short side plate 120 may mean the thickness direction of the mold 100 .

Inside the long-side plate 110 and the short-side plate 120 are formed channels (not shown) through which a cooling medium moves, and the melt injected into the mold 100 flows along the channels. It may be cooled by a moving cooling medium. As such, the melt may be solidified from the portion in contact with the inner surface of mold 100 and cast as a solidified shell or billet and withdrawn into the lower portion of mold 100 .

A nozzle 130 may be disposed on the top of the mold 100 to inject melt into the mold 100 . The nozzle 130 is arranged such that at least a portion thereof, for example, a lower portion thereof, is inserted into the interior of the mold 100 to dispense a melt contained in a tundish (not shown) disposed on the upper portion of the mold 100 into the mold 100 . can be injected inside the Nozzle 130 may comprise a nozzle body 132 having an inner bore through which the melt can move, and an outlet 134 through which the melt can move outwardly from the bore into mold 100 . At this time, the nozzle body 132 may be open at the top and closed at the bottom, and may be formed with an inner hole (not shown) to form a passage through which the molten material can move. At least two or more, for example, two or four ejection ports 134 may be formed on the lower side of the nozzle body 132 so as to eject the molten material into the mold 100 . At this time, the discharge port 134 may be formed at the lower side of the nozzle body 132 facing the short side plate 120 so as to discharge the molten material in the width direction of the mold 100 .

The static magnetic field generator 200 is disposed outside the mold 100 in the width direction and can apply a magnetic field, for example, a static magnetic field, to the melt. At this time, the static magnetic field generator 200 is disposed below the lower end of the nozzle 130 to control the downward flow of the melt discharged through the discharge port 134 . In addition, the static magnetic field generators 200 may be formed on both sides of the width direction of the mold 100 where the downward flow is formed to form a static magnetic field application area. The static magnetic field generator 200 can apply a static magnetic field in the width direction of the mold 100 to reduce the flow velocity of the downward flow of the melt formed at the peripheral edge of the mold 100 in the width direction. Here, the static magnetic field is a magnetic field generated by using a DC power supply for a magnetic field generator, and serves to slow down the flow velocity of the fluid by suppressing the flow and overall behavior of the fluid in the magnetic field region. can be done. As described above, when the static magnetic field is applied to the mold 100 by the static magnetic field generator 200, the movement of the downward flow is suppressed by the static magnetic field, and the flow speed of the downward flow can be reduced. Therefore, the downward movement distance of the inclusions is shortened, making it possible to reduce the penetration depth of the inclusions in the melt.

Conventionally, a method of controlling a downward flow by disposing a static magnetic field generator in a mold has been used. In this case, since the static magnetic field generator was arranged in the mold so as to apply the static magnetic field along the entire width of the mold, the velocity of the downward flow could be reduced. However, the flow of the melt is suppressed by the static magnetic field formed along the entire width of the mold, and the secondary upward flow is also reduced, causing inclusions contained in the melt to float upward and be removed. There was an inconvenience that it was difficult to

Therefore, in the present invention, the static magnetic field generator 200 is used to selectively form a static magnetic field applied region and a static magnetic field non-applied region along the width direction of the mold 100, thereby generating a magnetic field in the static magnetic field applied region. can be used to decelerate the flow velocity of the downward flow, and in the static magnetic field non-applied region, the influence of the magnetic field can be suppressed as much as possible to form a secondary upward flow.

The static magnetic field generator 200 can generate the static magnetic field so that the directions of the magnetic fields on both sides in the width direction of the mold 100 are different from each other in the thickness direction of the mold 100, for example, opposite to each other. For this reason, the static magnetic field generating unit 200 forms static magnetic field application regions on both sides of the mold 100 in the width direction, and the strength of the magnetic field formed in the static magnetic field application region is formed in the center in the width direction of the mold 100. is canceled, that is, a static magnetic field non-applied region can be formed. Therefore, the inclusions whose penetration depth is reduced in the static magnetic field applied region are likely to float upward due to the secondary upward flow formed in the static magnetic field non-applied region, so that defects on the cast slab surface due to the inclusions can be suppressed. can.

Such a static magnetic field generating unit 200 can reduce the flow velocity of the downward flow formed in the length direction of the mold 100 at both peripheral edges in the width direction of the mold 100 where the static magnetic field application region is formed. At the center in the width direction of the mold 100 where the static magnetic field is not applied, the flow speed of the secondary upward flow formed in the longitudinal direction of the mold 100 is increased or the secondary upward flow is smoothly formed. You can do something like that.

Here, the static magnetic field application region is a region in which a static magnetic field or a magnetic field is formed by the static magnetic field generator 200, and a region in which a static magnetic field or a magnetic field having a strength enough to apply the flow of the melt is applied. It can also mean In addition, the static magnetic field non-applied region may mean a region to which a static magnetic field or magnetic field having a strength that does not affect the flow of the melt is applied or to which no static magnetic field or magnetic field is applied. be. For example, a static magnetic field non-applied region may mean a region to which a static magnetic field or a magnetic field of approximately 0 to 100 Gauss is applied.

Referring to FIG. 2, the static magnetic field generator 200 includes a plurality of static magnetic field generators 210, 220, 230, and 240 arranged in the width direction of the long-side plate 110 below the lower end of the nozzle 130, and a plurality of static magnetic field generators. a first current supplier 250 capable of supplying direct current to the magnetic field generators 210, 220, 230, 240;

A plurality of static magnetic field generators 210 , 220 , 230 , 240 generate a first static magnetic field such that nozzle 130 is positioned between first static magnetic field generator 210 and first static magnetic field generator 210 . A second static magnetic field generator 220 spaced apart from the generator 210, and a third static magnetic field generator 230 and a third static magnetic field generator placed opposite the second static magnetic field generator 220 A fourth static magnetic field generator spaced apart from the third static magnetic field generator 230 such that the nozzle 130 is disposed between the generator 230 and facing the first static magnetic field generator 210 and a vessel 240 . The first static magnetic field generator 210 and the second static magnetic field generator 220 may be arranged on the outer surface of the first long side plate 111 so as to be separated from each other, and the third static magnetic field generator 230 and the third static magnetic field generator 230 may be arranged to be separated from each other. The four static magnetic field generators 240 may be arranged on the outer surface of the second long side plate 113 so as to be spaced apart from each other. At this time, the separation distance D between the first static magnetic field generator 210 and the second static magnetic field generator 220, for example, the first distance, the third static magnetic field generator 230 and the fourth static magnetic field generator The separation distance D from 240, eg, the second distance, may be equidistant. This is so that the static magnetic field non-applied area is formed at the center in the width direction of the mold 100 . The first distance and the second distance can be changed according to the width of the slab to be cast. It may be adjusted to a range of 36. Alternatively, the first distance and the second distance may be adjusted in the range of 10-25 or 15-20 when the total width of the slab is 100. At this time, when the first distance and the second distance are too shorter than the presented range, it is not possible to sufficiently secure a space in which the secondary upward flow is formed. Therefore, little or no secondary upflow is formed, or even if a secondary upflow is formed, it is formed in a relatively narrow area, so that inclusions contained in the melt are sufficiently removed. However, there is an inconvenience that it is difficult to On the other hand, when the first distance and the second distance are too long from the presented range, the downward flow whose flow velocity is reduced at both peripheral edges in the width direction of the mold 100 reaches the center of the mold 100. It is not possible to move sufficiently, and as a result, the flow velocity of the secondary ascending flow is also decelerated, which is disadvantageous in that it is difficult to float the inclusions upward.

As a result, the first static magnetic field generator 210, the second static magnetic field generator 220, the third static magnetic field generator 230, and the fourth static magnetic field generator 240 are movable along the width of the mold 100. Inclusions contained in the melt can be efficiently removed by appropriately adjusting the first distance and the second distance according to the width of the slab. At this time, the first distance and the second distance may be affected by the casting speed. For example, the width of the slab is 1100 mm or less, and the casting speed is 0.7 to 2.8 m / min. In some cases, the first distance and the second distance can be adjusted from 50 to 250 mm. When the width of the slab is 1100 to 1500 mm and the casting speed is 0.7 to 2.8 m/min, the first distance and the second distance can be adjusted to 100 to 350 mm. When the width of the slab is 1500-1900 mm and the casting speed is 0.7-2.8 m/min, the first distance and the second distance can be adjusted to 100-500 mm.

First, the first static magnetic field generator 210 is arranged biased to one side of the first long side plate 111 , and the second static magnetic field generator 220 is spaced apart from the first static magnetic field generator 210 . However, it may be arranged so as to be biased to the other side of the first long side plate 111 . At this time, the first static magnetic field generator 210 may comprise a first core 212 and a first coil 214 wound around the outside of the first core 212 . A second static magnetic field generator 220 may comprise a second core 222 and a second coil 224 wound around the outside of the second core 222 . Here, one side of the mold 100 or one side of the long side plate 110 means the direction in which the first short side plate 121 is located, and the other side of the mold 100 or the other side of the long side plate 110 side may refer to the direction in which the second short side plate 123 is located.

The first core 212 and the second core 222 may be arranged outside the mold 100 so as to be separated from each other in the width direction of the mold 100 . The first core 212 and the second core 222 may be shaped like plates extending in one direction. For example, the first core 212 and the second core 222 may be formed in a plate shape whose length in the width direction of the mold 100 is longer than the length in the width direction of the mold 100 . These first core 212 and second core 222 may be arranged in a line on the outer surface of the first long side plate 111 so as to extend along a part of the width direction of the first long side plate 111. good. At this time, the first core 212 and the second core 222 are arranged so as to be separated from each other at the center in the width direction of the mold 100 where the nozzle 130 is arranged so that the nozzle 130 can be arranged between them. good too.

Then, the first coil 214 may be wound in the direction in which the first core 212 extends outside the first core 212 , for example, in the width direction of the mold 100 . In addition, the second coil 224 may be wound horizontally in the direction in which the second core 222 extends outside the second core 222 , for example, in the width direction of the mold 100 .

Also, the third static magnetic field generator 230 is arranged biased to the other side of the second long side plate 113 , and the fourth static magnetic field generator 240 is spaced from the third static magnetic field generator 230 . However, it may be arranged so as to be biased to one side of the second long side plate 113 . At this time, the third static magnetic field generator 230 may be arranged to face the second static magnetic field generator 220, for example, to face the second static magnetic field generator 220, and the fourth static magnetic field generator 240 may be arranged to face the first static magnetic field generator 220. It may be arranged so as to face the static magnetic field generator 210 . A third static magnetic field generator 230 may comprise a third core 232 and a third coil 234 wrapped around the outside of the third core 232 . A fourth static magnetic field generator 240 may comprise a fourth core 242 and a fourth coil 244 wound around the outside of the fourth core 242 . The third core 232 and the fourth core 242 may be arranged outside the mold 100 so as to be separated from each other in the width direction of the mold 100 . The third core 232 and the fourth core 242 may be arranged in a row on the outer surface of the second long-side plate 113 so as to extend along part of the width direction of the second long-side plate 113 . At this time, the third core 232 and the fourth core 242 are arranged so as to be separated from each other at the center in the width direction of the mold 100 where the nozzle 130 is arranged so that the nozzle 130 can be arranged between them. good too.

Furthermore, the third coil 234 may be wound in the width direction of the mold 100 , which is the direction in which the third core 232 extends outside the third core 232 . In addition, the fourth coil 244 may be wound in the width direction of the mold 100 , which is the direction in which the fourth core 242 extends outside the fourth core 242 .

These first static magnetic field generator 210 , second static magnetic field generator 220 , third static magnetic field generator 230 and fourth static magnetic field generator 240 are electrically connected to the first current supplier 250 . may be connected. The first current supplier 250 supplies direct current to the first static magnetic field generator 210, the second static magnetic field generator 220, the third static magnetic field generator 230 and the fourth static magnetic field generator 240. be able to. The first current supplier 250 generates the first static magnetic field generator 210, the second static magnetic field generator 220, the third static magnetic field generator 230 and the fourth static magnetic field generator under the control of the controller 400. DC current can be supplied to the device 240 simultaneously or selectively. The first current supplier 250 includes the first static magnetic field generator 210, the second static magnetic field generator 220, and the third static magnetic field generator 230 so that the direction of the magnetic field is formed in the thickness direction of the mold 100. and the fourth static magnetic field generator 240 can be supplied with direct current. At this time, the first current supplier 250 may supply the DC current so that the directions of the magnetic fields are opposite to each other at the central portion, for example, both sides of the nozzle 130 in the width direction of the mold 100 . . That is, the first current supplier 250 forms a magnetic field direction from the first static magnetic field generator 210 to the fourth static magnetic field generator 240 on one side of the mold 100 , and the other side of the mold 100 . The first static magnetic field generator 210, the second static magnetic field generator 220, the second The three static magnetic field generators 230 and the fourth static magnetic field generator 240 can be supplied with direct current. At this time, the controller 400 controls the first static magnetic field generator 210, the second static magnetic field generator 220, the third static magnetic field generator 230, and the fourth static magnetic field generator 230 to adjust the intensity of the magnetic field. The first current supplier 250 can also be controlled to adjust the amount of current supplied to the static magnetic field generator 240 .

Here, the direction of the magnetic field formed on one side of the nozzle 130 in the width direction of the mold 100, for example, one side of the mold 100, is referred to as the first direction, and the other side of the nozzle 130 in the width direction of the mold 100 is referred to as the first direction. The direction of the magnetic field formed on one side, eg, the other side of the mold 100, is referred to as the second direction. For example, the direction of the magnetic field formed between the first static magnetic field generator 210 and the fourth static magnetic field generator 240 is referred to as the first direction, the second static magnetic field generator 220 and the third The direction of the magnetic field formed between the magnetic field generator 230 is referred to as the second direction. At this time, the first direction and the second direction may be directions opposite to each other. In the first core 212, the second core 222, the third core 232, and the fourth core 242, the direction facing the mold 100 is called one side, and the direction toward the outside of the mold 100 is called the other side. called. Therefore, the first current supplier 250 can supply direct current so that one side of the first core 212 and one side of the fourth core 242 facing each other have polarities opposite to each other. . The first current supplier 250 may supply direct current such that one side of the second core 222 and one side of the third core 232 facing each other have polarities opposite to each other. At this time, the first current supplier 250 can supply DC current such that one side of the first core 212 and one side of the second core 222 have opposite polarities, Direct current can be supplied such that one side of the third core 232 and one side of the fourth core 242 have opposite polarities.

For example, the first current supplier 250 has north poles on one side of the first core 212 and one side of the third core 232 and one side of the second core 222 and one side of the fourth core. DC current can be supplied such that one side of 242 has a south pole. In this case, when a DC current is generated in each of the static magnetic field generators 210, 220, 230 and 240 by the first current supplier 250, a static magnetic field is generated in each of the static magnetic field generators 210, 220, 230 and 240. obtain. In each of the static magnetic field generators 210, 220, 230, 240, a static magnetic field may be formed with a magnetic field direction from the south pole to the north pole. At this time, the static magnetic field generated in the first static magnetic field generator 210 is directed from the other side of the first core 212 to one side of the first core 212, and the fourth static magnetic field generator The static magnetic field generated at 240 may be formed such that the direction of the magnetic field is from one side of fourth core 242 to the other side of fourth core 242 . A magnetic field having a first direction, for example, may be formed on one side of the mold 100 from the first static magnetic field generator 210 towards the fourth static magnetic field generator 240 . The direction of the magnetic field generated in the third static magnetic field generator 230 is directed from the other side of the third core 232 to the one side of the third core 232, The static magnetic field generated in may be formed such that the direction of the magnetic field is from one side of the second core 222 to the other side of the second core 22 . A magnetic field having a second direction, for example, may be formed on one side of the mold 100 from the third static magnetic field generator 230 towards the second static magnetic field generator 220 . Here, the first direction is from the first static magnetic field generator 210 to the fourth static magnetic field generator 240 and the second direction is from the third static magnetic field generator 230 to the second static magnetic field generator. 220, but in the first current supply 250, the first static magnetic field generator 210, the second static magnetic field generator 220, the third static magnetic field generator 230 and the fourth static magnetic field generator 230; The first direction and the second direction can be changed according to the state of supplying the DC current to the static magnetic field generator 240 of . However, also in this case, the first direction and the second direction may be opposite to each other.

FIG. 3 is a diagram for explaining the principle of controlling the flow of melt using a static magnetic field generator.

First, a melt may be injected into mold 100 using nozzle 130 . Before the melt is injected into the mold 100, the nozzle 130 may be positioned at the center in the width direction of the mold 100. FIG. Then, a static magnetic field applied region and a static magnetic field non-applied region are formed in the width direction of the mold 100 using the static magnetic field generator 200, and the cast slab is generated while controlling the flow of the melt in the length direction of the mold 100. You can pull it out. At this time, the process of forming the static magnetic field applied region and the static magnetic field non-applied region in the width direction of the mold 100 may be performed before the molten material is injected into the mold 100 or after the molten material is injected into the mold 100. It may be done at the same time as pouring the melt into the mold 100 .

The melt flow may be controlled as follows.

Referring to FIG. 3, a first static magnetic field generator 210, a second static magnetic field generator 220, a third static magnetic field generator 230 and a fourth static magnetic field generator are connected via a first current supplier 250. 240, each of the first static magnetic field generator 210, the second static magnetic field generator 220, the third static magnetic field generator 230 and the fourth static magnetic field generator 240 forms a static magnetic field. can do. At this time, the first static magnetic field generator 210 and the third static magnetic field generator 230 arranged to be shifted from each other around the nozzle 130 may have the same polarity and are arranged to be shifted from each other. The second static magnetic field generator 220 and the fourth static magnetic field generator 240 may have the same polarity. For example, one side of the first core 212 and one side of the third core 232 form the same polarity, e.g. One side can form the same polarity, eg south pole. Then, the static magnetic field generated in each static magnetic field generator 210, 220, 230, 240 has a magnetic field direction from south pole to north pole along each core 212, 222, 232, 242. Become. At this time, the magnetic field around each core 212, 222, 232, 242 will also have a magnetic field direction from the south pole to the north pole, but around each core 212, 222, 232, 242 A magnetic field may be formed in the thickness direction of the mold 100 depending on the direction of the formed magnetic field. Also, the magnetic field gradually weakens with increasing distance from each core 212 , 222 , 232 , 242 . Therefore, between the first static magnetic field generator 210 and the fourth static magnetic field generator 240 facing each other, the magnetic field is canceled and no magnetic field is applied, or a section with a very weak magnetic field is formed. It becomes possible to This is because one side of the first core 212 and one side of the fourth core 242 facing each other have opposite polarities. Also, between the second static magnetic field generator 220 and the third static magnetic field generator 230 facing each other, a section in which no magnetic field is applied or the strength of the magnetic field is very weak may be formed. This is because one side of the second core 222 and one side of the third core 232 facing each other have opposite polarities. Furthermore, a magnetic field is generated between the first static magnetic field generator 210 and the second static magnetic field generator 220 and between the third static magnetic field generator 230 and the fourth static magnetic field generator 240 adjacent to each other. Sections may be formed in which the magnetic field strength is either not applied or is very weak. For this reason, between the static magnetic fields respectively generated in the first static magnetic field generator 210, the second static magnetic field generator 220, the third static magnetic field generator 230 and the fourth static magnetic field generator 240, for example, the mold 100 At the center in the thickness direction of the mold 100 and at the center in the width direction of the mold 100, no magnetic field is applied or a section where the strength of the magnetic field is very weak, that is, a static magnetic field non-applied area may be formed. Here, no magnetic field is applied or the strength of the magnetic field is very weak may mean that the strength of the magnetic field is 0 to 100 Gauss or less.

In this way, the first static magnetic field generator 210, the second static magnetic field generator 220, the third static magnetic field generator 230 and the fourth static magnetic field generator 240 are arranged outside the mold 100, A static magnetic field application region is formed in a region where the first static magnetic field generator 210, the second static magnetic field generator 220, the third static magnetic field generator 230 and the fourth static magnetic field generator 240 are arranged, selectively forming a static magnetic field non-applied region between the first static magnetic field generator 210, the second static magnetic field generator 220, the third static magnetic field generator and the fourth static magnetic field generator 240; can be done. Therefore, in the static magnetic field applied region, the flow velocity of the downward flow of the melt can be decelerated using the magnetic field, and in the static magnetic field non-applied region, the influence of the magnetic field is suppressed as much as possible to smoothly form the secondary upward flow. can do. At this time, the width of the static magnetic field non-applied region can be adjusted according to the width of the slab to be cast. As described above, it is possible to smoothly form the secondary upward flow by adjusting the width of the static magnetic field non-applied region according to the width of the slab.

Here, an example in which the first core 212 and the second core 222 and the third core 232 and the fourth core 242 are separated in the width direction of the mold 100 will be described. An example of forming a static magnetic field non-applied area and a static magnetic field applied area has been described. However, the static magnetic field non-applied area and the static magnetic field applied area may be formed in the width direction of the mold 100 .

FIG. 4 is a cross-sectional view of casting equipment according to a modification of the present invention. The casting equipment according to the modification of the present invention connects the first static magnetic field generator 210 and the second static magnetic field generator 220 with the first connecting core 272, and the third static magnetic field generator 230 and the third static magnetic field generator 230. Except that the four static magnetic field generators 240 are connected to each other by the second connecting core 274, the casting equipment can be formed in almost the same structure as the casting equipment of the above-described embodiment.

The first connecting core 272 connects the first core 212 of the first static magnetic field generator 210 and the second core 222 of the second static magnetic field generator 220 to each other along the width direction of the mold 100. may At this time, the first connecting core 272 may connect the other side of the first core 212 and the other side of the second core 222 to each other, and the first long side plate constituting the mold 100 It may be arranged so as to be spaced apart from the outer surface of 111 . The second connecting core 274 connects the third core 232 of the third static magnetic field generator 230 and the fourth core 242 of the fourth static magnetic field generator 240 to each other along the width direction of the mold 100. may At this time, the second connecting core 274 may connect the other side of the third core 232 and the other side of the fourth core 242 to each other, and form the second long side plate that constitutes the mold 100 . It may be arranged so as to be spaced apart from the outer surface of 113 .

Thus, the first connecting core 272 connects the first core 212 and the second core 222, the second connecting core 274 connects the third core 232 and the fourth core 242, When direct current is supplied to the first static magnetic field generator 210, the second static magnetic field generator 220, the third static magnetic field generator 230 and the fourth static magnetic field generator 240, the first static magnetic field generator 210 , the second static magnetic field generator 220, the third static magnetic field generator 230 and the fourth static magnetic field generator 240, respectively. In this case, a static magnetic field can be formed along the width direction of the mold 100 outside the mold 100 and a static magnetic field can be formed along the thickness direction of the mold 100 . For example, a south pole can be formed on one side of the first core 212 and the third core 232, and a north pole can be formed on one side of the second core 222 and one side of the fourth core 242. . In this case, the static magnetic field generated in each static magnetic field generator 210, 220, 230, 240 should have a magnetic field direction along the respective core 212, 222, 232, 242 going from south pole to north pole. become. At this time, the magnetic field around each core 212, 222, 232, 242 will also have a magnetic field direction from the south pole to the north pole, but around each core 212, 222, 232, 242 A magnetic field can be formed in the thickness direction of the mold 100 according to the direction of the formed magnetic field. In the thickness direction of the mold 100, the direction of the magnetic field is directed from the fourth magnetic field generator 240 to the first magnetic field generator 210, and the magnetic field directed from the second magnetic field generator 220 to the third magnetic field generator 230. , can be formed. Note that the strength of the magnetic field gradually weakens as the distance from each core 212 , 222 , 232 , 242 increases. Therefore, between the first static magnetic field generator 210 and the fourth static magnetic field generator 240 facing each other, the magnetic field is canceled and no magnetic field is applied, or a section with a very weak magnetic field is formed. obtain. This is because one side of the first core 212 and one side of the fourth core 242 facing each other have opposite polarities.

Also, no magnetic field is applied between the second static magnetic field generator 220 and the third static magnetic field generator 230 facing each other, or a section with a very weak magnetic field strength may be formed. This is because one side of the second core 222 and one side of the third core 232 facing each other have opposite polarities. In addition, a magnetic field is generated between the first static magnetic field generator 210 and the second static magnetic field generator 220 and between the third static magnetic field generator 230 and the fourth static magnetic field generator 240 adjacent to each other. Sections may be formed in which the magnetic field strength is either not applied or is very weak. For this reason, between the static magnetic fields respectively generated in the first static magnetic field generator 210, the second static magnetic field generator 220, the third static magnetic field generator 230 and the fourth static magnetic field generator 240, for example, the mold 100 At the center in the thickness direction of the mold 100 and at the center in the width direction of the mold 100, no magnetic field is applied or a section where the strength of the magnetic field is very weak, that is, a static magnetic field non-applied area may be formed.

Along with this, the direction of the magnetic field directed from the first static magnetic field generator 210 to the second static magnetic field generator 220 is directed to the first connecting core 272 that connects the first core 212 and the second core 222. A static magnetic field having a magnetic field direction from the third static magnetic field generator 230 toward the fourth static magnetic field generator 240 may be formed in the second coupling core 274 . At this time, the directions of the static magnetic fields formed in the first connection core 272 and the second connection core 274 may be opposite to each other.

Accordingly, the magnetic field direction of the static magnetic field can be formed to rotate along the width direction and the thickness direction of the mold 100 . Therefore, between the static magnetic fields formed on both sides in the width direction of the mold 100, there may be formed a region in which the strength of the magnetic field is very weak or no magnetic field is formed in the width direction of the mold 100. FIG. In addition, between the magnetic fields formed on both sides in the thickness direction of the mold 100 , there may be formed a region in which the strength of the magnetic field is very weak or no magnetic field is formed along the thickness direction of the mold 100 . For this reason, the strength of the magnetic field is very high at the position where the region in contact with the magnetic field formed along the thickness direction of the mold 100 and the region in contact with the magnetic field along the width direction of the mold 100 intersect each other, for example, at the center of the mold 100 . or a region without a magnetic field, that is, a static magnetic field non-applied region may be formed.

FIG. 5 is a diagram showing a state of controlling the flow of melt in the casting method according to the embodiment of the present invention.

FIG. 5(a) is a diagram showing the flow state of the melt in the mold 100 before the flow of the downward flow and the secondary upward flow is controlled using the static magnetic field generator 200, and FIG. ) shows the flow state of the melt when a static magnetic field is applied along the entire width direction of the mold 100, and FIG. FIG. 5 is a diagram showing the flow state of a melt when a static magnetic field applied region and a static magnetic field non-applied region are formed along the width direction.

The discharge flow of the melt M discharged through the discharge port 134 of the nozzle 130 may form an upward flow and a downward flow after colliding with the inner surfaces of both sides of the mold 100 in the width direction of the mold 100 . In FIG. 5, MF may mean mold flux and MS may mean mold slag in which mold flux is melted.

Referring to (a) of FIG. 5, when the flow of the melt is not controlled using the static magnetic field generator 200, the flow velocity of the downward flow is relatively high. You can see that it is very deep. In this case, since the static magnetic field generator 200 is not used to control the flow of the melt, it can be seen that the secondary upward flow is smoothly formed. However, the inclusions contained in the melt move far along the longitudinal direction of the mold 100, i.e., the drawing direction of the slab, due to the downward flow, and can be sufficiently floated upward by the secondary upward flow. and as a result, a large amount of inclusions remain intact in the melt.

Referring to FIG. 5(b), when a magnetic field is applied along the entire width of the mold 100, the magnetic field slows down the flow velocity of the downward flow, shortening the movement distance of the inclusions downward. I understand. In addition, the formation of the secondary ascending flow is suppressed by the magnetic field, and the secondary ascending flow is not normally formed. It can be seen that it does not float and as a result remains intact in the melt.

On the other hand, referring to FIG. 5(c), when the flow of the melt is controlled using the static magnetic field generator 200, downward flow occurs on both sides in the width direction of the mold 100, which is the static magnetic field application region. It can be seen that the moving distance of the inclusions on the lower side became shorter due to the deceleration of the flow velocity. A static magnetic field non-applied region is formed at the center in the width direction of the mold 100, which is a static magnetic field non-applied region. It can be seen that the is smoothly lifted upward and removed.

FIG. 6 is a diagram showing analysis results of a secondary ascending flow in a mold depending on whether or not a static magnetic field non-applied region is formed in the width direction of the mold. FIG. 6(a) is a diagram showing the flow state of the melt when a static magnetic field is applied across the width of the mold. FIG. 10 is a diagram showing a flow state of a melt when a static magnetic field non-applied region is formed in .

Referring to (a) of FIG. 6, it can be seen that the secondary upward flow is hardly formed when the static magnetic field is applied across the entire width of the mold. On the other hand, referring to FIG. 6B, when the static magnetic field non-applied region is formed in the center in the width direction of the mold, the secondary rise occurs in the center in the width direction of the mold to which the static magnetic field is not applied. It can be confirmed that the flow is formed smoothly.

Thus, by selectively forming the static magnetic field applied region and the static magnetic field non-applied region along the width direction of the mold, the flow of the melt in the mold is locally controlled to improve the cleanliness of the melt. can be secured. In addition, it is possible to improve the quality of cast slabs cast using such a melt.

On the other hand, the casting equipment according to the embodiment of the present invention has a moving magnetic field generator disposed above the static magnetic field generator 200 outside the mold 100 in order to control the flow of the melt above the static magnetic field generator 200. A unit 300 may be provided. At this time, the control unit 400 may control the operation of the moving magnetic field generating unit 300 to adjust at least one of strength and direction of the moving magnetic field.

A portion of the melt ejected from the nozzle 130 may form an upward flow after colliding with the short side plate 120 . The direction of movement of the upward flow is switched near the surface of the melt, and the upward flow moves horizontally toward the center in the width direction of the mold 100 . Thus, a melt stream moving toward the widthwise center of the mold 100, e.g., a horizontal stream, collides with the melt stream moving from the nozzle 130 and the opposite direction. A vortex can be formed near the nozzle 130 . At this time, if the flow velocity of the horizontal flow is too high, there is an inconvenience that different substances such as mold flux and mold slag in the upper part of the melt are mixed into the melt. On the other hand, if the flow velocity in the horizontal direction is too slow, the temperature of the melt may become uneven within the mold 100 . Therefore, by controlling the horizontal flow of the melt near the surface of the melt using the moving magnetic field generator 300, different substances such as mold flux and mold slag are mixed into the melt. This makes it possible to control the temperature of the molten material in the mold 100 evenly and uniformly. The flow velocity of the melt in the horizontal direction is affected by the flow velocity of the melt discharged from the discharge port 134 of the nozzle 130, that is, the flow velocity of the discharge flow. Therefore, by controlling the flow velocity of the discharge flow using the moving magnetic field generator 300, the flow velocity of the horizontal flow of the melt formed near the surface of the melt can be controlled.

FIG. 7 is a cross-sectional view of the casting facility along line B-B' shown in FIG.

The moving magnetic field generator 300 is disposed above the static magnetic field generator 200, for example, between the surface of the melt and the lower end of the nozzle 130, so that the flow of the melt differs from that of the static magnetic field generator 200. direction can be controlled. Referring to FIG. 7, the moving magnetic field generator 300 includes a plurality of moving magnetic field generators 310, 320, 330, and 340 spaced apart at least in the width direction of the long side plate, and a plurality of moving magnetic field generators. and a second current supplier 350 capable of selectively supplying alternating current. The plurality of moving magnetic field generators 310 , 320 , 330 , 340 are arranged with the first moving magnetic field generator 310 arranged above the first static magnetic field generator 210 so as to be aligned with the first static magnetic field generator 210 . , is spaced apart from the first moving magnetic field generator 310 such that the nozzle 130 is positioned between the first moving magnetic field generator 310 and a second static magnetic field generator above the second static magnetic field generator 310. A second moving magnetic field generator 320 arranged in parallel with the magnetic field generator 220 , and a second moving magnetic field generator 320 arranged to face the second moving magnetic field generator 320 and above the third static magnetic field generator 230 . from the third moving magnetic field generator 330 such that the nozzle 130 is positioned between the third moving magnetic field generator 330 arranged in line with the static magnetic field generator 230 and the third moving magnetic field generator 330 A fourth moving magnetic field generator 340 may be provided that is spaced apart and aligned with the fourth static magnetic field generator 240 above the fourth static magnetic field generator 240 . That is, the first moving magnetic field generator 310 and the second moving magnetic field generator 320 are arranged outside the first long-side plate 111, and extend in the width direction of the mold 100 into areas where the moving magnetic field is applied and areas where the moving magnetic field is not applied. A region may be formed. In addition, the third moving magnetic field generator 330 and the fourth moving magnetic field generator 340 are arranged outside the second long side plate 113 and extend in the width direction of the mold 100 to form a moving magnetic field applied region and a moving magnetic field non-applied region. A region may be formed. Each of the first moving magnetic field generator 310, the second moving magnetic field generator 320, the third moving magnetic field generator 330, and the fourth moving magnetic field generator 340 includes a plurality of cores and a magnetic field outside the cores. and a coil to be wound. Each moving magnetic field generator 310, 320, 330, 340 may comprise three, four, five or more cores, where each moving magnetic field generator 310, 320, 330, A case where the 340 has four cores will be described as an example.

For example, the first moving magnetic field generator 310 extends in the thickness direction of the mold 100, and includes a first core 312a, a second core 312b, a third core 312c, and a third core 312c arranged side by side along the width direction of the mold 100. There may be a core #4 312d and coils #1 314a, #2 314b, #3 314c and #4 314d wrapped around the outside of each core 312a, 312b, 312c, 312d. The second current supplier 350 is electrically connected to the first coil 314a, the second coil 314b, the third coil 314c and the fourth coil 314d to supply alternating current to the respective coils 314a, 314b, 314c and 314d. Current can be selectively supplied. In this case, the second current supplier 350 is arranged such that the respective coils 314a, 314b, 314c, 314d are south poles at phase differences of 0°, 90°, 180°, and 270°, as shown in Table 1 below. A cosine shaped current can be applied to each coil 314a, 314b, 314c, 314d so as to have a north pole.

Referring to Table 1, if an AC power source with a phase of 0° is supplied to the first coil 314a and the third coil 314c, the first coil 314a has a south pole and the third coil 314c has a north pole. be able to. If AC power with a phase of 90° is supplied to the second coil 314b and the fourth coil 314d, the second coil 314b may have a south pole and the fourth coil 314d may have a north pole. If AC power with a phase of 180° is supplied to the first coil 314b and the third coil 314d, the first coil 314b can have a north pole and the third coil 314d can have a south pole. Also, if AC power with a phase of 270° is supplied to the second coil 314b and the fourth coil 314d, the second coil 314b may have a north pole and the fourth coil 314d may have a south pole. If AC power is supplied to each coil in this manner, the polarity of each coil is periodically changed according to the phase of the supplied AC current. Therefore, the first moving magnetic field generator 310 can move the magnetic field in the direction in which the coils are arranged, in other words, in the width direction of the mold 100, that is, form a moving magnetic field.

The second moving magnetic field generator 320 , the third moving magnetic field generator 330 and the fourth moving magnetic field generator 340 can form moving magnetic fields in the same manner as the first moving magnetic field generator 310 . Thereby, a moving magnetic field applied area and a moving magnetic field unapplied area can be formed along the width direction of the mold 100 . 7, 322a-322d and 324a-324d denote the cores and coils of the second moving magnetic field generator 320, and 332a-332d and 334a-334d denote the cores and coils of the third moving magnetic field generator 330. 342 a - 342 d and 344 a - 344 d mean the core and coil of the fourth moving magnetic field generator 340 .

The second current supplier 350 includes the first moving magnetic field generator 310, the second moving magnetic field generator 320, and the third moving magnetic field generator 330 so that the direction of the magnetic field is formed in the width direction of the mold 100. and the fourth moving magnetic field generator 340 can be supplied with alternating current. At this time, the second current supplier 350 can control the horizontal flow formed by the ascending flow by controlling the flow velocity of the discharged flow within the mold 100 . For this purpose, the second current supplier 350 generates the first moving magnetic field so that the direction of the magnetic field is formed along the horizontal direction, that is, along the width direction of the mold 100, which is the same as the moving direction of the ejection flow. Alternating current can be supplied to the generator 310 , the second moving magnetic field generator 320 , the third moving magnetic field generator 330 and the fourth moving magnetic field generator 340 . In this case, the second current supplier 350 may supply an alternating current so that at least some of the moving magnetic field generators 310, 320, 330, and 340 form moving magnetic fields in different directions. . For example, the second current feeder 350 is directed to the first moving magnetic field generator 310 and the second moving magnetic field generator 320 arranged outside the first long side plate 111 in the same direction, e.g. A moving magnetic field in the same direction is formed, and the third moving magnetic field generator 330 and the fourth moving magnetic field generator 340 arranged outside the second long side plate 113 move in the same direction, e.g. An alternating current can be supplied such that a magnetic field is created. At this time, the third direction and the fourth direction may be directions opposite to each other. Alternatively, the second current supplier 350 forms a moving magnetic field in the same direction, for example, the third direction, in the first moving magnetic field generator 310 and the fourth moving magnetic field generator 340 arranged to face each other. , alternating current may be supplied such that a moving magnetic field in the same direction, for example a fourth direction, is formed in the second moving magnetic field generator 320 and the third moving magnetic field generator 330 arranged to face each other. can. At this time, the directions of the magnetic fields formed by the first moving magnetic field generator 310, the second moving magnetic field generator 320, the third moving magnetic field generator 330, and the fourth moving magnetic field generator 340 are It can be changed according to the flow velocity of the discharge flow discharged from the discharge port 134 .

FIG. 8 is a diagram showing an example of controlling the flow of melt using a moving magnetic field generator. As shown in FIG. 8(a), when the flow velocity of the discharge stream is too high, the flow velocity of the horizontal flow increases near the surface of the melt. In this case, the second current supplier 350 includes the first moving magnetic field generator 310, the second moving magnetic field generator 320, the third moving magnetic field generator 310, the second moving magnetic field generator 320, and the third moving magnetic field generator 310 so that a moving magnetic field is formed in a direction opposite to the moving direction of the discharge flow. 1 moving magnetic field generator 330 and the fourth moving magnetic field generator 340 can be supplied with alternating current. At this time, the second current supplier 350 operates the first moving magnetic field generator 310, the second moving magnetic field generator 320, and the second moving magnetic field generator 320 so that the direction of the moving magnetic field is formed from the periphery of the mold 100 toward the center. Alternating current may be supplied to the third moving magnetic field generator 330 and the fourth moving magnetic field generator 340 . As a result, the velocity of the discharge flow formed from the discharge port 134 of the nozzle 130 is reduced, and the surface of the molten material can be stably controlled.

On the other hand, as shown in FIG. 8(b), if the flow velocity of the discharge stream is too slow, the flow velocity of the horizontal flow can be decelerated near the surface of the melt. In this case, the second current supplier 350 includes the first moving magnetic field generator 310, the second moving magnetic field generator 320, and the third moving magnetic field generator 310 so that a moving magnetic field is formed in the same direction as the moving direction of the discharge flow. The moving magnetic field generator 330 and the fourth moving magnetic field generator 340 can be supplied with alternating current. At this time, the second current supplier 350 operates the first moving magnetic field generator 310, the second moving magnetic field generator 320, and the second moving magnetic field generator 320 so that the direction of the moving magnetic field is formed from the center to the periphery of the mold 100. Alternating current may be supplied to the third moving magnetic field generator 330 and the fourth moving magnetic field generator 340 . As a result, the velocity of the discharge flow that is discharged from the discharge port 134 of the nozzle 130 is increased, and flows such as a downward flow, an upward flow, and a secondary upward flow are smoothly formed. The temperature of the melt can be controlled evenly and uniformly.

On the other hand, the second current supplier 350 includes the first moving magnetic field generator 310, the second moving magnetic field generator 320, the third moving magnetic field generator 310, and the third moving magnetic field generator 310 to form a moving magnetic field rotating in the circumferential direction of the mold 100. Alternating current can be supplied to the magnetic field generator 330 and the fourth moving magnetic field generator 340 . When a moving magnetic field rotating along the circumferential direction of the mold 100 is formed in this way, the melt is stirred when the temperature of the melt is uneven near the surface of the melt or when the temperature drops. Therefore, the temperature of the melt can be uniformly controlled in the vicinity of the melt. Here, it was explained that the direction of the magnetic field, ie, the direction of the moving magnetic field, is controlled to control the ejection flow and the horizontal flow of the melt. At least one of them may be changed to control melt flow. At this time, the strength of the magnetic field may be changed by adjusting the amount of alternating current supplied to each of the moving magnetic field generators 310 , 320 , 330 and 340 .

By controlling the discharge flow and the horizontal flow of the melt in the mold 100 using the moving magnetic field generator 300 in this manner, the surface of the melt is stabilized and the surface of the melt increases. It is possible to suppress or prevent foreign substances such as mold slag and mold flux placed above from being mixed into the melt.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is by no means limited to the above-described embodiments. Those of ordinary skill in the art to which this invention pertains will appreciate that various modifications may be made and other equivalent embodiments may be employed. Therefore, the technical protection scope of the present invention should be defined by the following claims.

According to the present invention, by selectively applying a static magnetic field in the width direction of the mold to selectively control the flow of the melt in the length direction of the mold, different types of flux such as mold flux and mold slag are applied to the melt. It is possible to manufacture high-quality products by suppressing the contamination of substances such as Through this, the cleanliness of the melt can be ensured and the quality of products manufactured using the melt can be improved.

100 mold 110 long side plate 111 first long side plate 113 second long side plate 120 short side plate 121 first short side plate 123 second short side plate 130 nozzle 132 nozzle body 134 ejection port 200 static magnetic field generation Section 210 First static magnetic field generator 212 First core 214 First coil 220 Second static magnetic field generator 222 Second core 224 Second coil 230 Third static magnetic field generator 232 Third core 234 third coil 240 fourth static magnetic field generator 242 fourth core 244 fourth coil 250 first current supplier 310 first moving magnetic field generator 312a first core 314a first coil 312b second core 314b No. 2 coil 312c No. 3 core 314c No. 3 coil 312d No. 4 core 314d No. 4 coil 320 Second moving magnetic field generator 322a No. 1 core 324a No. 1 coil 322b No. 2 core 324b No. 2 coil 322c No. 3 core 324c 3 No. 3 coil 322d No. 4 core 324d No. 4 coil 330 Third moving magnetic field generator 332a No. 1 core 334a No. 1 coil 332b No. 2 core 334b No. 2 coil 332c No. 3 core 334c No. 3 coil 332d No. 4 core 334d No. 4 coil 340 4th moving magnetic field generator 342a 1st core 344a 1st coil 342b 2nd core 344b 2nd coil 342c 3rd core 344c 3rd coil 342d 4th core 344d 4th coil

Claims (24)

A casting facility for casting a slab,
a mold that provides a space for the molten material to be contained therein;
a nozzle disposed at the top of the mold for supplying the melt to the mold;
a static magnetic field generator arranged outside in the width direction of the mold so as to control the direction of the magnetic field in different directions at the peripheral edge portions on both sides in the width direction of the mold;
a control unit capable of controlling the operation of the static magnetic field generating unit;
foundry equipment. The mold includes a pair of long side plates that are spaced apart and a pair of short side plates that connect both sides of the pair of long side plates, respectively,
The static magnetic field generator is
a plurality of static magnetic field generators arranged in the width direction of the long side plate under the nozzle so as to be spaced apart from the center in the width direction of the mold;
a first current supplier capable of supplying direct current to the plurality of static magnetic field generators so as to form a magnetic field passing in the mold thickness direction on both sides of the nozzle in the width direction of the mold;
The foundry facility of claim 1, comprising: Each of the plurality of static magnetic field generators,
cores extending along part of the width direction of the long side plate and arranged to be separated from each other;
a coil wrapped around the outside of the core;
3. The casting facility of claim 2, comprising: The plurality of static magnetic field generators are
a first static magnetic field generator;
a second static magnetic field generator spaced to one side of the first static magnetic field generator such that the nozzle is positioned between the first static magnetic field generator;
a third static magnetic field generator arranged to face the second static magnetic field generator;
spaced apart on one side of the third static magnetic field generator and facing the first static magnetic field generator such that the nozzle is positioned between the third static magnetic field generator a fourth static magnetic field generator arranged to
with
The first current supplier is
The first static magnetic field generator and the second static magnetic field generator are arranged so as to form mutually opposite polarities in directions facing each other in the thickness direction of the mold and mutually opposite polarities in the width direction of the mold. 4. Casting equipment according to claim 3, wherein direct current can be supplied to said third static magnetic field generator and said fourth static magnetic field generator. The first static magnetic field generator and the second static magnetic field generator are separated by a first distance, and the third static magnetic field generator and the fourth static magnetic field generator are separated , separated by a second distance, and
5. The casting facility of claim 4, wherein said first distance and said second distance are equidistant. The casting facility according to claim 5, wherein the first distance and the second distance are 4 to 36 when the overall width of the cast slab is 100. At least one of the first static magnetic field generator, the second static magnetic field generator, the third static magnetic field generator, and the fourth static magnetic field generator extends in the width direction of the mold. 7. A casting facility according to claim 6, arranged to be movable along the . a first connecting core for connecting the first static magnetic field generator and the second static magnetic field generator;
a second connecting core for connecting the third static magnetic field generator and the fourth static magnetic field generator;
8. The casting facility of claim 7, comprising: 9. The casting facility according to claim 8, wherein the static magnetic field generator can generate a magnetic field that rotates in the circumferential direction of the mold. a moving magnetic field generator disposed above the static magnetic field generator and capable of forming a moving magnetic field to control the flow of the melt;
10. The controller according to any one of claims 1 to 9, wherein the controller can control the operation of the moving magnetic field generator so as to adjust at least one of strength and direction of the moving magnetic field. Foundry equipment. 11. The casting facility according to claim 10, wherein the moving magnetic field generator includes a plurality of moving magnetic field generators capable of forming a moving magnetic field in the width direction of the mold on both sides of the nozzle. 12. Casting equipment according to claim 11, wherein the moving magnetic field generator is arranged in line with a static magnetic field generator and is capable of controlling the flow of the melt in a different direction than the static magnetic field generator. injecting the melt into the mold using the nozzle;
forming a static magnetic field applied region and a static magnetic field non-applied region in the width direction of the mold to control the flow of the melt in the length direction of the mold;
a process of drawing out the cast slab;
Casting method including. Before the process of injecting the melt,
including the step of arranging the nozzle at the center in the width direction of the mold;
The step of controlling the flow of the melt includes the step of forming the static magnetic field non-applied area at the center in the width direction of the mold and forming the static magnetic field applied areas on both sides of the static magnetic field non-applied area. 14. A casting method according to claim 13. The step of controlling the flow of the melt comprises:
15. The casting method according to claim 14, further comprising forming the static magnetic field applied region and the static magnetic field non-applied region below the nozzle. The step of controlling the flow of the melt comprises:
including a step of forming a static magnetic field along the thickness direction of the mold;
16. The method of claim 15, wherein the step of forming the static magnetic field applying region includes the step of forming the static magnetic field so that the direction of the magnetic field is opposite to each other on both sides of the nozzle in the width direction of the mold. casting method. The step of controlling the flow of the melt comprises:
17. The casting method according to claim 16, further comprising the step of forming the static magnetic field non-applied area in a part of the center in the width direction of the mold where the nozzle is arranged. The step of controlling the flow of the melt comprises:
18. The casting method according to claim 17, comprising a step of controlling the range of the static magnetic field applied region so that the static magnetic field non-applied region has a magnetic field of 0 to 100 Gauss. The step of controlling the flow of the melt comprises:
19. The casting method according to claim 18, comprising the step of adjusting the distance between the static magnetic field application regions according to the width of the slab. The step of controlling the flow of the melt comprises:
The static magnetic field applied regions are formed on both sides of the mold in the width direction to reduce the flow velocity of the downward flow of the melt, and the static magnetic field non-applied regions are formed between the static magnetic field applied regions. 20. The casting method of claim 19, including the step of forming an upward flow of said melt. The step of controlling the flow of the melt comprises:
21. The casting method of claim 20, further comprising forming a moving magnetic field applied region and a moving magnetic field non-applied region in the width direction of the mold to control the flow of the melt in the width direction of the mold. The process of controlling the flow of the melt in the width direction of the mold includes:
22. The casting method according to claim 21, comprising forming the moving magnetic field applied area and the moving magnetic field unapplied area between the surface of the melt and the lower end of the nozzle. The process of forming the moving magnetic field application area includes:
23. The casting method of claim 22, comprising forming a moving magnetic field across the width of the mold on both sides of the nozzle. The process of forming the moving magnetic field application area includes:
24. The casting method of claim 23, comprising adjusting the magnetic field strength and/or direction of the traveling magnetic field.

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