KR20150069272A - continuous casting apparatus and controlling system for cast of using it - Google Patents

Abstract

The present invention relates to a continuous casting facility and a casting control method using the same. The facility includes a tundish storing a melt; a slide gate placed in a lower part of the tundish to open and close a route of molten steel discharged from the tundish; a measurer including a measuring rod, soaked in the melt by being inserted from an upper part of the tundish into a lower part of the tundish, and measuring the weight of the melt attached to the measuring rod; and a controller connected to the measurer to control the operation of the slide gate according to a weight value of the measured melt. As the weight of the melt remaining in the tundish is measured, closing time of the slide gate is derived by using the weight of the melt, and casting is completed by closing the slide gate after the derived closing time, after the completion of the casting, a residual amount in the tundish is reduced and the inflow of slags into a mold is suppressed or prevented. Therefore, the efficiency and productivity of the processes are improved as the recovery of molten steel increases, and a problem on the quality degradation of cast-piece, caused by the inflow of slags into the mold, is solved.

Description

TECHNICAL FIELD The present invention relates to a continuous casting apparatus and a casting control method using the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting facility and a casting control method using the same. More particularly, the present invention relates to a continuous casting facility for continuously casting, And a casting control method using the same.

1, a continuous casting process for producing molten steel as a slab is performed by continuously casting molten steel M contained in the ladle 50 in a continuous casting machine mold 400 , And the molten steel (M) is supplied and cooled to produce the slab (B).

During the continuous casting, molten steel can be classified into primary, mid, and late casting operations by supplying 100 tons of molten steel to the tundish 100 from the ladle 50, The casting operation is performed by continuously changing the ladle of new molten steel after the injection of molten steel into the ladle 100 is completed (this is referred to as " casting operation " The casting operation is carried out while exchanging four or five ladles in one tundish), and the end casting operation is performed in the tundish 100 The remaining molten steel is injected.

In the final casting operation, the supply of additional molten steel from the ladle 50 is completed in addition to the molten steel stored in the tundish, and the amount of molten steel stored in the tundish 100 decreases as the casting operation progresses. At this time, as the amount of molten steel in the tundish decreases, a vortex (V) is generated on the discharge port 150 through which molten steel escapes from the tundish. Accordingly, the slag S is mixed with the molten steel in the tundish 100 into the mold, thereby deteriorating the quality of the slab produced at the end of the continuous casting.

In order to prevent the inclusion of slag in the mold 400, the casting is terminated by closing the slide gate 200 while leaving a molten steel amount of 60 to 70 tons before the vortex is generated, Causing problems.

Further, when excessive slag is present in the tundish or when the molten steel flow is unstable, the time point of occurrence of the vortex becomes faster, so that the slide gate 200 must be closed while leaving a larger amount of molten steel.

In order to reduce the amount of tundish remaining in the tundish, conventionally, a method of reducing the amount of tundish in the tundish, so that the molten steel can be easily moved toward the discharge port 150 and introduced into the mold 400 using a method of adding or adding a refractory to form a tilt in the tundish Respectively. However, the above-described method causes the increase of the refractory cost because the refractory should be additionally installed in the tundish.

In addition, the addition of the refractory reduces the content of the tundish, thereby reducing the flotation rate of the molten steel, which is the main function of the tundish, thereby reducing the cleanliness of the molten steel.

In this way, even if the amount of the remaining tin is reduced by changing the refractory shape in the tundish, the productivity of the process is reduced because it is necessary to stably retain the residue of 6 tons or more in order to prevent the slag inflow into the mold.

KR 2013-0107575 A1

The present invention provides a continuous casting facility capable of suppressing or preventing the inflow of slag in a tundish at the end of a casting to improve the quality of the cast steel, and a casting control method using the same.

The present invention provides a continuous casting facility capable of reducing the amount of tundish remaining in a tundish without changing the shape of the refractory in the tundish and increasing the productivity of the casting operation, and a casting control method using the same.

A continuous casting facility according to an embodiment of the present invention includes a tundish in which a melt can be received, a slide gate disposed in a lower portion of the tundish to open and close a moving path of molten steel discharged from the tundish, A measuring device for measuring the weight of the molten solid adhering to the measuring rod and having a measuring rod which is charged into the tundish at an upper portion of the dish and is immersible in the molten material and a measuring device connected to the measuring device, And a controller for controlling the operation of the slide gate according to the weight value of the slide gate.

The slide gate may include an upper plate disposed at a lower portion of the tundish, a lower plate disposed at a lower portion of the upper plate, and an intermediate plate disposed between the upper plate and the lower plate.

Wherein the measuring unit is provided with a sensing unit for sensing the weight of the molten material solidified in the measuring rod and one end of the measuring rod immersed in the molten material is contacted with the inner bottom surface of the tundish when the measuring rod is immersed in the molten material, Can be located.

The controller may receive the weight value of the melt measured from the sensing unit, and may control the opening / closing operation of the slide gate according to the weight value, the predetermined casting width, and the casting speed.

A casting control method according to an embodiment of the present invention is a casting control method for reducing the amount of remaining tundish in a tundish, comprising the steps of: introducing a melt into the tundish; opening a slide gate provided under the tundish to start casting Measuring the weight of the remaining melt in the tundish; deriving a closing time of the slide gate using the measured weight of the melt; and closing the slide gate after the derived closing time to cast .

Between the step of starting the casting and the step of measuring the weight of the melt, moving a measuring instrument for measuring the weight of the melt to the tundish side, charging the measuring rod into the tundish, And placing the end of the measuring rod on the substrate.

Measuring the weight of the melt comprises immersing the measuring rod in the melt when the melt in the tundish remains between 15 and 16 tons, removing the measuring rod from the melt after the measuring time has elapsed And comparing the weight of the measuring rod extracted from the melt with the weight of the existing measuring rod to derive the weight of the melt.

The measurement time may be performed within 5 seconds to 10 seconds immediately after immersing the measurement rod in the melt.

The step of deriving the closing time of the slide gate may be derived based on a predetermined set value depending on the weight of the derived molten material, the preset casting width and the casting speed.

The set value may be derived based on an experimentally obtained experimental value, and the closing time may be a time at which the slide gate is opened from immediately after the weight of the melt is derived to when the slide gate is closed.

In the step of closing the slide gate to complete the casting, the depth of the melt in the tundish may be 85 to 90 mm upward from the inner bottom surface of the tundish, and the remaining amount of melt in the tundish may be 3 to 4 tons .

The melt may include the molten steel and the slag.

According to the embodiment of the present invention, it is possible to suppress or prevent the slag in the tundish from entering the mold at the end of the continuous casting operation.

That is, at the end of the casting, when the remaining amount of tundish in the tundish is 15 to 16 tons, the pipe is immersed in the molten metal to measure the weight of the residue. Thereafter, the closing time of the slide gate is determined according to the weight of the residue, the width of the casting, and the casting speed. Thus, the slide gate is automatically closed after the elapsed time, so that the height of the residue in the tundish is maintained at a constant height. At this time, the time required until the slide gate is closed after the weight of the residue is measured is based on the time value obtained by the experiment.

In this way, after the end of continuous casting of molten steel is completed, the height of the residue in the tundish can be kept constant, and the slag in the tundish can be suppressed or prevented from flowing into the mold. That is, the minimized amount of the remaining slag can be present in the tundish before the slag is introduced into the mold by the vortex phenomenon.

Accordingly, it is possible to solve the problem of quality deterioration of the cast steel due to the influx of the slag in the mold, and it is possible to reduce the residual amount in the tundish compared to the conventional method, thereby increasing the productivity and efficiency of the process.

1 is a view showing a general continuous casting facility.
2 is a view showing the flow of molten steel and slag in the tundish at the end of continuous casting.
3 is a view showing a part of a continuous casting facility according to an embodiment of the present invention.
4 is data showing an experimental value of the slide gate closing time applied to the embodiment of the present invention.
5 is a flowchart showing a casting control method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. Wherein like reference numerals refer to like elements throughout.

3 is a view showing a continuous casting facility according to an embodiment of the present invention.

The continuous casting equipment in the embodiment of the present invention is a facility for reducing the amount of residue in the tundish 100 and suppressing or preventing the inflow of slag into the mold 400, A slide gate 200 disposed at a lower portion of the tundish 100 for opening and closing the moving path of the molten steel M discharged from the tundish 100; And a measuring rod 510 which is charged into the dish 100 and immersed in the melt F. The measuring rod 500 is connected to the measuring device 500 for measuring the weight of the melt, And a controller 600 for controlling the operation of the slide gate 200 according to the weight of the melt.

Such a continuous casting facility is a facility for continuously casting molten steel conveyed from a converter. After molten steel accommodated in the ladle 50 is supplied to the tundish 100, the molten steel in the molten steel Separation of the inclusions is carried out. Thereafter, molten steel is injected into the mold () to cool the molten steel and produce the cast steel having a constant shape. At this time, the ladle (50) is provided in a plurality of four or five, and can continuously supply the molten metal to the tundish (100).

The melt F flows into the tundish 100 from the ladle 50 and may include at least a portion of the molten steel M or the slag S inevitably introduced from the ladle 50 therein. At this time, the slag S can be disposed on the molten steel M by the specific gravity difference.

The tundish 100 has a refractory 105 formed on the outer wall and the bottom surface of the tundish 100. In order to suppress the rapid movement of the inner wall surface of the tundish 100 toward the discharge port 150 after the molten metal F flows into the tundish 100, A dam 110 and a weir 130 capable of reducing the moving speed of the flood F can be installed. A slide gate 200 is provided between the tundish 100 and the mold 400 to block or open the path between the tundish 100 and the mold 400. An upper nozzle (not shown) may be provided between the slide gate 200 and the tundish 100 to be connected to the outlet 150 of the tundish 100. An immersion nozzle 300 for supplying molten steel introduced from the tundish 100 to the center of the mold 400 may be provided under the slide gate 200.

The slide gate 200 opens and closes between the tundish 100 and the mold 400 and controls the communication between the tundish 100 and the mold 400 so that the molten steel M It is a means to control the injection and the injection flow rate. The slide gate 200 is composed of an upper plate 210, an intermediate plate 230 and a lower plate 250 and has a through hole 210a, 230a, 250a formed in each plate 210, 230, The communication between the tundish 100 and the mold 400 can be controlled by the communication. That is, the slide gate 200 connects or disconnects the upper through-hole 210a and the lower through-hole 250a by sliding the intermediate plate 230 between the upper plate 210 and the lower plate 250, (M) may be injected into the mold 400 and the casting may proceed.

The measuring device 500 is a device for measuring the approximate weight of the melt in the tundish 100 during the casting process of the continuous casting installation 1000 and includes a measuring rod 510 having a predetermined length and capable of being loaded into the tundish 100, A supporting part 530 for supporting the measuring rod 510 and a driving part 550 for moving the measuring instrument 500 toward the tundish 100 and loading the measuring rod 510 into the tundish 100, And a sensing unit 570 disposed outside the measuring rod 510 for measuring the weight of the measuring rod 510.

The measuring rod 510 is immersed in the melt to measure the weight of the melt in the tundish 100 during the casting process, and is formed in the shape of a rod extending for a predetermined length. That is, one end of the measuring rod 510 is immersed into the melt, and the measuring rod 510 can be charged into the tundish 100 from the one end to be immersed upward. The measuring rod 510 can be disposed such that one end immersed in the melt F comes into contact with the inner bottom surface of the tundish 100. [ At this time, the measuring rod 510 may be formed of a material capable of reducing the damage due to the temperature of the melt.

More specifically, the supporting unit 530 connects between the driving unit 550 and the measuring rod 510, which will be described later, so that the measuring rod 510 is moved by the operation of the driving unit 550 And can serve as a support for loading or unloading the tundish into the tundish 100.

The driving unit 550 is a device provided to move the measuring instrument 500 and charge the measuring rod 510 into the tundish 100. That is, the driving unit 550 can be operated when the casting of the continuous casting equipment 1000 starts, so that the measuring unit 500 can be arranged close to the tundish 100. In addition, the measuring rod 510 can be charged into or removed from the tundish 100. FIG. The driving unit 550 may be a device capable of performing a certain distance and movement according to the operation of the motor.

The sensing unit 570 is provided outside the other end opposite to the one end of the measuring rod 510 charged in the tundish 100 to measure the weight of the measuring rod 510. For example, The load cell 570 may be used. The sensing unit 570 measures the weight of the measuring rod 510 to measure the weight of the remaining molten material in the tundish 100 by comparing the weight of the measuring rod 510 before and after immersion in the molten material can do. Therefore, the sensing unit 570 can derive the weight of the solidified solid on the outside of the measuring rod 510 that has been immersed in the melt.

The controller 600 is provided to control the operation of the slide gate 200 according to the weight value of the melt measured by the measuring device 500. That is, the controller 600 receives the weight value of the molten material F solidified outside the measuring rod 510 from the measuring device 500. Thereafter, the time for maintaining the casting until the slide gate 200 is closed immediately after the measurement rod 510 is withdrawn from the melt F is derived according to the predetermined casting width and casting speed value and the weight value of the melt Casting can be controlled.

Hereinafter, a casting control method using the continuous casting facility 1000 formed as described above will be described with reference to FIGS. 4 and 5. FIG.

4 is data showing an experimental value of the slide gate closing time applied to the embodiment of the present invention. 5 is a flowchart showing a casting control method according to an embodiment of the present invention.

The casting control method according to the embodiment of the present invention is a casting control method for reducing the amount of remaining tundish in the tundish 100. The casting control method includes the steps of introducing a melt into the tundish 100, Opening the gate 200 to start casting, measuring the weight of the remaining melt in the tundish 100, calculating the closing time of the slide gate 200 using the weight of the measured melt (F) And closing the slide gate 200 after the derived closure time to complete the casting.

First, molten steel introduced from a converter (not shown) is refined according to a desired steel type, and is then transferred to a continuous casting facility 1000 in a ladle (not shown) to start casting (S100). Molten steel accommodated in the ladle flows into the tundish 100 through a shroud nozzle (not shown) provided at the bottom of the ladle. At this time, the molten steel injected into the mold 400 through the tundish 100 is supplied from the plurality of ladles 50. When the molten steel in the tundish 100 is exhausted, the ladle 50 ) ≪ / RTI > Therefore, due to the difference in specific gravity, the slag floats on the molten steel and can be suppressed or prevented from being injected into the mold 400. However, since there is no molten steel supplied into the tundish 100 at the end of casting, there is a need for a method for increasing the yield of the casting while reducing the amount of molten steel remaining in the tundish 100. Accordingly, by using the manufacturing method according to the embodiment of the present invention, the depth of the residue in the tundish 100 can be controlled to have a predetermined depth so that the slag does not enter the mold.

During the casting process, when the casting molten steel is injected into the tundish 100 (S200), the measuring device 500 moves to measure the weight of the tundish in the tundish 100 toward the tundish 100 S300). At this time, the process of injecting the casting molten steel into the tundish 100 and moving the measuring device 500 to the tundish 100 side can be performed by the operator pressing the operation button to start the process. Thereafter, the process to be performed until the operation of the measuring instrument 500 and the completion of the casting can be performed automatically by a predetermined operating method.

In detail, the measuring instrument is moved toward the tundish 100, and the measuring rod 510 of the measuring instrument 500 is charged into the tundish 100. Thus, one end of the measuring rod 510 is placed on the molten metal bath surface. The reason why the measurement rod 510 is disposed on the melt surface of the melt is that the measurement rod 510 is immersed in the melt for a short time in the process of immersing the measurement rod 510 with the melt to measure the weight of the melt, In order to make it possible. Accordingly, the end of the measuring rod 510 may be disposed inside the tundish 100 so as to be close to the molten metal bath surface (S400).

On the other hand, the measuring rod 510 moving on the molten metal bath surface can be moved to a point where 20 to 21 tons of the molten material remaining in the tundish 100 remain, and wait for the melted material to be immersed. At this time, the time at which the measuring rod 510 is disposed is not limited when the remaining amount of the melt in the tundish 100 is 20 to 21 tons. However, when the amount of the tundish remaining in the tundish 100 exceeds the above range, The measurement rod 510 may be exposed to the high temperature of the melt until the measurement rod 510 is immersed, so that deformation due to high temperature may occur. Further, when the amount of the molten material remains below the above range, the measuring rod 510 is immersed in the molten material to measure the weight of the molten material, The slag in the mold 400 may flow into the mold 400 when the lead-out time is long, which may reduce the stability of the process. Therefore, the residual amount of the melt at the time when the measuring rod 510 is waiting may be in the above range.

After the end of the measuring rod 510 is disposed on the molten metal bath surface, the measuring rod 510 in the tundish 100 is immersed to measure the weight of the remaining molten metal in the tundish 100 (S500). More specifically, when the melt in the tundish 100 remains 15 to 16 tons, the measuring rod is immersed in the melt so that one end of the measuring rod 510 to be immersed can be brought into contact with the inner bottom surface of the tundish 100 . At this time, the immersion of the measuring rod 510 when the immersion in the tundish 100 is in the above range is performed when the immersion member 510 is immersed in the remaining amount exceeding the above range, The region where the measurement rod 510 is lost due to the melt increases due to an increase in the area. When the time when the measuring rod 510 is immersed is less than the above range, the slag, which is not a molten steel, is continuously supplied by the casting operation which is continuously performed even during the measurement of the weight of the molten material through the measuring rod 510 Since the molten metal can be introduced into the mold 400, the measurement of the melt weight using the measuring rod 510 can be performed within the above range.

On the other hand, the measurement time of the measurement rod 510 immersed in the melt can be performed within 5 seconds to 10 seconds immediately after immersing the measurement rod 510 into the melt. In this case, when the measurement time is less than 5 seconds, the measurement rod 510 is not provided with sufficient time for the melt to solidify, so that the measurement is not easy and the measurement time is longer than 10 seconds There is a problem that the measurement rod 510 is immersed in the melt for a long time, thereby increasing the amount of loss due to the melt. Therefore, the time for which the measuring rod 510 is immersed and the weight of the melt is measured can be performed within the above range.

After the measuring time has elapsed as described above, the weight of the melt can be derived by taking the measuring rod 510 out of the melt and comparing the weight of the measuring rod with the weight of the measuring rod taken out from the melt. That is, the weight of the melt derived by the measurement rod 510 may be the weight of the solidified melt attached to the measurement rod 510. More specifically, the measuring rod 510 is immersed until it contacts the inner bottom surface of the tundish 100, so that the depth at which the measuring rod is immersed is the depth of the melt F remaining in the tundish 100, Represents the weight of the melt F that solidifies on the measuring rod 510 according to the depth of the melt.

When the weight of the melt is derived, the closing time of the slide gate 200 is derived according to the derived weight value (S600). More specifically, in order to derive the closing time of the slide gate 200, the closing time can be derived based on the predetermined value set according to the weight value of the melt, the predetermined casting width, and the casting speed. At this time, the closing time represents the time when the slide gate 200 is opened from immediately after the weight of the melt is derived to when the slide gate 200 is closed. That is, the time from when the weight of the melt is measured to the time when the slide gate 200 is opened when the casting is started to the time when the slide gate 200 is closed is derived. Therefore, by deriving the closing time, which is the time at which the casting is continued, the controller 600 described above can close the slide gate 200 after closing time and control the casting.

The closing time derived from the weight of the melt, the casting width and the casting speed measured through the measuring rod is determined by the experimentally obtained experimental values. Thus, the experimental time value for the closing time derived from the weight of the melt measured through the measuring rods, the casting width and the casting speed is shown in Fig.

Referring to Fig. 4, it shows the casting width and casting speed generally used in the continuous casting process. Thus, the closing time was derived in accordance with the residual weight (kg) measured by the measuring device 500 at the respective casting widths (mm) and casting speeds (meters per minute; mpm).

That is, when the casting width is 1600 mm and the casting speed is 1.5 mpm, the closing time is 54 seconds, the closing time is 69, the residue weight is 3.2 , The closure time was found to be 88 in the range of the closing time of 80 and the weight of the residue of 3.7 or more and 4.2 or less, and the closing time of 95 seconds in the range of 4.2 to 4.7. In this case, when the casting width is 1600 mm and the casting speed is 1.35 mpm, the closing time is 55 seconds, the closing time is 71, the residue weight is 3.2 The closing time is 82 and the weight of the residue is 3.7 or more and less than 4.2, the closure time is 90 and the closing weight is 4.2 to less than 4.7, the closure time may be 97 seconds.

On the other hand, when the casting width is 1800 mm and the casting speed is set to 1.3 mpm, the closing time is 72 seconds when the weight of the residue is 2.3 to less than 2.7, the closing time is 72 when the weight of the residue is 2.7 or more and less than 3.2, In the range of 3.2 to 3.7, the closure time is 82 and the weight of the residue is 3.7 to 4.2, the closure time is 90 and the closure weight is 4.2 to 4.7. In this case, when the casting width is 1800 mm and the casting speed is 1.2 mpm, the closing time is 61 seconds, the closing time is 77, the residue weight is 3.2 , The closure time is 87 and the weight of the residue is 3.7 or more and less than 4.2, the closure time is 95. When the weight of the residue is 4.2 or more and less than 4.7, the closing time is 102 seconds.

On the other hand, when the casting width is 2000 mm and the casting speed is set to 1.15 mpm, the closure time is 74 and the weight of the residue is within the range of 2.3 to 2.7 when the closing time is 58 seconds and the residue weight is 2.7 to 3.2 In cases where the closure time is in the range of 3.2 to 3.7 and the closure time is in the range of 4.3 to 4.2, the closure time is 94 and the closure time is 4.2 to less than 4.7, the closure time may be 101 seconds. In this case, when the casting width is 2000 mm and the casting speed is 1.0 mpm, the closing time is 62 seconds, the closing time is 79, the residue weight is 3.2 , The closure time was found to be 96 in the range of the closing time of 88 and the weight of the residue of 3.7 to 4.2, and the closing time of 103 seconds in the range of 4.2 and less than 4.7.

When the casting width is 2200 mm and the casting speed is set to 0.9 mpm, the closing time is 72 seconds in the range of 2.3 to less than 2.7, the closing time is 72 in the range of 2.7 to less than 3.2, In the range of 3.2 to 3.7, the closure time is 82 and the weight of the residue is 3.7 to 4.2, the closure time is 90 and the closure weight is 4.2 to 4.7. In this case, when the casting width is 2200 mm and the casting speed is 0.8 mpm, the closure time is 76, the weight of the residue is 3.2 in the range of 2.3 to 2.7 when the closing time is 60 seconds, , The closure time is 91 and the closure time is 4.2 or more and 4.7 or less, the closure time may be 98 seconds.

In the case where the predetermined casting width is 1800 mm and the casting speed is 1.3 mpm and the weight of the residue in the tundish 100 measured by the measuring device 500 is 4.3 Kg, the controller 600 can derive 93 seconds in association with the values. Immediately after the weight of the measuring rod 510 is derived, the controller 600 counts the time, and after 93 seconds, the slide gate 200 is operated to close the moving path of the molten steel from the tundish 100 S700), the casting of molten steel is completed (S800).

The case where the weight of the melt F measured by the measuring instrument 500 is not included in the range shown in FIG. 4 will be described as follows. That is, when the weight value of the melt F exceeds the maximum residual weight value of 4.7 kg shown in FIG. 4, the measurement rod 510 of the measuring device 500 is immersed in the desired residual amount of the melt F And the process of immersing the measuring rod 510 is performed again. Therefore, the weight of the melt F solidified in the measuring rod 510 has a value (2.3? X < 4.7) given by the preset value of the present invention, so that the closing time can be derived from the experimental value. At this time, when the weight of the melt F is less than 2.3 kg, which is the minimum residue weight value, the slide gate 200 is closed to complete casting, or the slide gate 200 is closed within a time shorter than the closing time of the minimum weight range You may.

However, in addition to the above-mentioned method, it is possible to derive the closing time according to experimental values according to the weight value by widening the range of predetermined set values shown in FIG. 4 to calculate experimental values.

Thus, by closing the slide gate 200 and completing the casting, the depth of the residue (remaining melt) in the tundish 100 can remain 85 to 90 mm upward from the inner bottom surface of the tundish 100. That is, when the molten material having such a depth remains, the slag can be suppressed or prevented from entering the mold 400 due to the vortex action. In addition, about 3 to 4 tonnes of the remaining molten metal remain at the depth, which is conventionally reduced in the tundish 100 by a reduced amount of molten material for about 6 tonnes of residue, so that additional casting of the melt It can be seen that the efficiency of the process and the productivity are increased.

As described above, according to the present invention, in the last stage of casting, the weight of the remaining molten material in the tundish is measured, the weight of the molten material is measured against the predetermined casting width and casting time, The duration of the process (closing time) is derived. Thus, by closing the slide gate after the derived closing time, the amount of the remaining melt in the tundish can be reduced compared to the conventional one, and the slag can be prevented or prevented from flowing into the mold.

Although the present invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the present invention is not limited thereto but is limited by the following claims. Accordingly, those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the spirit of the following claims.

F: Melt M: Molten steel
S: Slag 50: Ladle
55: shroud nozzle 100: tundish
110: Dam 130: Weir
200: slide gate 400: mold
500: Meter 510: Measuring rod
530: Support part 550:
570: Detector 600: Controller

Claims (12)

As a continuous casting facility,
A tundish in which the melt can be received;
A slide gate disposed at a lower portion of the tundish to open and close a movement path of the molten steel discharged from the tundish;
A measuring device for measuring the weight of the molten solid adhering to the measuring rod, the measuring rod being charged into the tundish at an upper portion of the tundish to be immersed in the molten material; And
And a controller connected to the measuring device and controlling the operation of the slide gate according to a weight value of the melt measured by the measuring device. The method according to claim 1,
The slide gate
An upper plate disposed below the tundish,
A lower plate spaced below the upper plate,
And an intermediate plate disposed between the upper plate and the lower plate. The method according to claim 1,
Wherein the measuring unit is provided with a sensing unit for sensing the weight of the molten material solidified in the measuring rod,
Wherein one end of the measuring rod immersed in the melt is in contact with the inner bottom surface of the tundish when the measuring rod is immersed in the melt. The method of claim 3,
The controller comprising:
And receives the weight value of the melt measured from the sensing unit and controls the opening and closing operation of the slide gate according to the weight value, the predetermined casting width and the casting speed. A casting control method for reducing a residual amount in a tundish,
Introducing the melt into the tundish;
Opening a slide gate provided at a lower portion of the tundish to start casting;
Measuring the weight of the remaining melt in the tundish;
Deriving a closing time of the slide gate using the weight of the measured melt; And
And closing the slide gate after the derived closing time to complete the casting. The method of claim 5,
Between starting the casting and measuring the weight of the melt,
Moving a measuring device for measuring the weight of the melt to the tundish side;
Charging the tundish into the tundish; And
And disposing an end of the measuring rod on the melt bath surface. The method of claim 6,
Wherein measuring the weight of the melt comprises:
Immersing the measuring bar in the melt when the melt in the tundish remains between 15 and 16 tons;
Withdrawing the measuring rod from the melt after a measurement time has elapsed; And
And comparing the weight of the measuring rod extracted from the melt with the weight of the existing measuring rod to derive the weight of the melt. The method of claim 7,
Wherein the measuring time is performed within 5 seconds to 10 seconds immediately after immersing the measuring rod in the melt. The method of claim 5,
Wherein deriving the closing time of the slide gate comprises:
And wherein the casting control method is derived based on a predetermined set value according to the weight of the derived molten material, the predetermined casting width and the casting speed. The method of claim 9,
The set values are derived based on experimental values obtained in advance by experiments,
Wherein the closing time is a time at which the slide gate is opened from immediately after the weight of the melt is drawn to a time point at which the slide gate is closed. The method of claim 5,
In the step of closing the slide gate to complete the casting,
The depth of the melt in the tundish is 85 to 90 mm from the inner bottom surface of the tundish,
Wherein the residual amount of the melt in the tundish is 3 to 4 tons. The method of claim 5,
Wherein the molten steel comprises the molten steel and the slag.

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