KR20160038967A - Tundish position control apparatus and method - Google Patents

Abstract

An embodiment of the present invention relates to an apparatus and a method to control a tundish position. The apparatus of the present invention comprises: a tundish to store molten metal inside; a cooling roll placed on a bottom of the tundish to cool the molten metal discharged from the tundish; and a control unit to elevate the tundish and control a position of the tundish. The control unit makes a falling speed of the tundish in a second section, where a distance between the tundish and the cooling roll is smaller than a specific value, lower than a rising speed of the tundish in a first section, where the distance between the tundish and the cooling roll is greater than a specific value; and controls a position of the tundish. Accordingly, since the apparatus to control the position of the tundish divides the section into a precise control section and a non-precise control section, and makes the moving speed of the tundish in the non-precise control section higher; a time to prepare a casting can be reduced, and can intensively perform a precise control in the precise control section.

Description

[0001] TUNDISH POSITION CONTROL APPARATUS AND METHOD [0002]

The present invention relates to a tundish position control device and a tundish position control method.

In general, amorphous alloy ribbons (hereinafter referred to as amorphous ribbons) are disordered atomic structures in which the crystal structure is water or glass. Accordingly, amorphous alloys are free from crystalline imperfections such as grain boundaries and dislocations, which are characteristics of crystalline alloys, and have excellent soft magnetic properties such as soft magnetic properties, Corrosion resistance, superconductivity and the like. Due to the above characteristics, the amorphous alloy fiber can be used as a material excellent in mechanical and magnetic properties as a refractory material, a reinforcing material for building structures, and a noise absorbing material between concrete layers.

An amorphous alloy is produced by rapid cooling of a molten metal in a molten state. Thus, amorphous alloys keep the disordered atomic arrangement of the liquid up to the solid state without the time for the atoms to be ordered and crystallize.

Due to the nature of the amorphous material, the molten metal requires rapid cooling of more than 10 ⁵ K / s, so only a small amount of molten metal is injected into the cooling roll and rapidly cooled. Control of the fine gaps between the nozzle for discharging the molten metal and the cooling roll is necessary in order to control the amount of molten metal to be sprayed onto the cooling roll. For example, thickness, one of the important characteristics of amorphous ribbons, needs to be within a few micrometers of error.

To this end, it is necessary to precisely control the position of the tundish while spraying the melt onto the cooling roll. However, when the position of the tundish is precisely controlled in the casting process of the entire amorphous ribbon, there is a problem that the casting process time of the entire amorphous ribbon is prolonged and the productivity is lowered. In addition, there is a problem that it is difficult to avoid interference (unexpected situation) with other devices at the casting preparation time and casting completion time.

The following Patent Document 1 relates to a tundish position control method and a system suitable for the tundish position control method, and does not disclose a solution for solving the above problems.

Korean Patent Publication No. 10-2009-0084223

In order to solve the above problems, an embodiment of the present invention provides a tundish position control device and a tundish position control method.

A tundish position control apparatus according to an embodiment of the present invention includes a tundish for storing molten metal therein; A cooling roll disposed below the tundish to cool the molten metal discharged from the tundish; And a control unit for controlling the position of the tundish by moving the tundish up and down; Wherein the controller controls the lowering speed of the tundish in a second section in which the distance between the tundish and the cooling roll is smaller than a specific value, 1, the position of the tundish can be controlled to be slower than that of the tundish at the first interval.

A nozzle disposed at a lower portion of the tundish to spray the molten metal; A gap measuring unit for measuring a gap between the nozzle and the cooling roll when the tundish is located in the second section; And a gap controller for controlling a gap between the nozzle and the cooling roll based on a gap measured by the gap measuring unit; As shown in FIG.

Also, while the tundish descends in the second section, the controller may lower the tundish at a moving speed that is slow enough that the tundish oscillates at a displacement less than half the gap between the nozzle and the cooling roll .

The tundish position control device according to an embodiment of the present invention may be configured to detect at least one of the temperature, the weight, the level of the molten metal stored in the tundish, the rotation speed of the cooling roll, and the occurrence of an emergency situation And the control unit may control the tundish based on the detection result of the sensing unit.

Further, the cooling roll starts to rotate after the tundish descends to the standby position, and the control unit lowers the tundish from the standby position after the rotation speed of the cooling roll sensed by the sensing unit becomes higher than the target speed .

Also, the control unit may lower the tundish to a standby position after the temperature sensed by the sensing unit rises above a target temperature.

In addition, the controller may raise the tundish after the weight or the level detected by the sensing unit reaches a minimum value.

In addition, the controller may raise the tundish when the sensing unit senses an unexpected condition.

A tundish position control method according to an embodiment of the present invention includes a first moving step of moving a tundish storing a molten metal to a standby position; A second moving step of moving the tundish located at the standby position to a target position; A molten metal spraying step of spraying a molten metal stored in the tundish to a cooling roll at a tundish located at the target position; And returning the tundish at the target position to a standby position; And the tundish moving speed of the second moving step may be slower than the tundish moving speed of the first moving step.

A gap measuring step of measuring a gap between the nozzle and the cooling roll included in the tundish in the second moving step and the molten metal jetting step; And a gap control step of controlling a gap between the nozzle and the cooling roll based on the gap measured in the gap measuring step; As shown in FIG.

In addition, the second moving step may move the tundish to a target position at a moving speed that is slow enough for the tundish to vibrate at a displacement less than half the gap between the nozzle and the cooling roll while the tundish moves .

In addition, the returning step may move the tundish faster than the tundish moving speed of the second moving step.

The tundish position control method according to an embodiment of the present invention may further include a temperature sensing step of sensing the temperature of the molten metal stored in the tundish, wherein the first movement step is performed when the temperature detected in the temperature sensing step is equal to or higher than the target temperature The tundish can be moved to the standby position after being raised.

Further comprising a cooling roll rotating step of rotating the cooling roll at a target speed after the tundish is moved to a standby position by the first moving step and the second moving step is a step of rotating the cooling roll at a target speed The tundish can be moved to the target position.

Further, the method may further include a molten metal sensing step of sensing at least one of a weight and a level of the molten metal stored in the tundish, and the returning step may be performed after the weight or the level detected in the molten metal sensing step becomes a minimum value, The dish can be returned to the standby position.

The method may further include an unexpected condition detecting step of detecting an occurrence of an emergency situation while the tundish dispenses the molten metal stored in the tundish to the cooling roll, The tundish can be returned to the standby position.

The tundish position control apparatus according to an embodiment of the present invention can shorten the tundish preparation time by speeding up the tundish moving speed in the non-precision control period by dividing the precision control period and the non-precision control period, Can be precisely controlled within the range.

In addition, when the casting is terminated or an unexpected situation occurs, the tundish quickly moves to the standby position, thereby preventing dangerous situations such as sudden interference of the interference equipment or scattering of the molten metal.

1 is a view illustrating a tundish position control apparatus according to an embodiment of the present invention.
2 is a view showing the position and movement of the tundish before the tundish blows the molten metal.
3 is a view showing the position and movement of the tundish after the molten metal injection of the tundish is started.
4 is a flowchart illustrating a tundish position control method according to an embodiment of the present invention.
5 is a flowchart showing a tundish position control method up to the second movement step of the tundish.
6 is a flowchart showing a tundish position control method after the second moving step of the tundish.
7 is a graph showing a tundish moving speed according to a tundish position coordinate axis in the tundish position control apparatus and method.
8 is a graph showing coordinate axes of tundish positions according to the tundish operation time in the tundish position controller and method.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention. In the following detailed description of the preferred embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the drawings, like reference numerals are used throughout the drawings.

In addition, the suffix "part" for a component used in the present specification is given or mixed in consideration of ease of specification, and does not have its own meaning or role. Furthermore, terms including ordinals such as first, second, etc. used in this specification can be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

1 is a view illustrating a tundish position control apparatus according to an embodiment of the present invention.

1, a tundish position controller 100 according to an embodiment of the present invention includes a tundish 110, a cooling roll 120, a controller 130, a nozzle 140, a gap measuring unit 150, a gap control unit 160, and a sensing unit 170.

The tundish 110 may store molten metal therein. Here, the molten metal may be used for producing an amorphous alloy using melt spinning. The tundish 110 can be raised or lowered.

The cooling roll 120 may be disposed below the tundish 110 to cool the molten metal discharged from the tundish 110. For example, the molten metal is rapidly cooled while being sprayed on the circumferential surface of the cooling roll 120 rotating at high speed through the nozzle 140, so that a ribbon having a constant width and a thickness that maintains the amorphous state can be manufactured .

The control unit 130 can control the position of the tundish 110 by moving the tundish 110 up and down. Here, the control unit 130 can automatically determine the casting conditions (casting preparation, casting, casting completion, etc.) and execute a predetermined operating scenario for each situation. For example, in a gap control where the cooling roll 120 is always located at the same place and moves the tundish 110, the tundish position control device controls the gap between the second It is possible to carry out precise control in the section and control for ensuring rapid movement in the first section as the other region.

The control unit 130 controls the tundish 110 and the tundish 110 so that the descending speed of the tundish 110 in the second section where the distance between the tundish 110 and the cooling roll 120 is less than a specific value, The position of the tundish 110 can be controlled by setting the distance between the cooling rolls 120 to be slower than the rising / falling speed of the tundish in the first section, which is greater than a specific value. Here, the specific value may be a length of an area measurable by the gap measuring unit 150. For example, if the gap measuring unit 150 can sense the tundish 110, the controller 130 can determine that the tundish 110 is located in the second interval. At this time, the controller 130 may determine that the casting condition is changed and may set the descent speed of the tundish 110 to be slow.

While the tundish 110 descends in the second section, the controller 130 controls the tundish 110 to oscillate at a displacement smaller than half the gap between the nozzle 140 and the cooling roll 120, The tundish can be lowered at a moving speed that is slow enough to make the tundish. As the up / down speed of the tundish 110 is increased, the vibration displacement of the tundish 110 can be increased. If the tundish 110 vibrates at a displacement greater than half the gap between the nozzle 140 and the cooling roll 120, the nozzle 140 and the cooling roll 120 may collide. Therefore, when the tundish 110 is located in the second section, the controller 130 can set the descent speed of the tundish 110 at a slow speed that minimizes the possibility of collision. The specific value of the slow speed may vary depending on the design of the tundish position controller 100.

That is, the control unit 130 divides the precision control interval (second interval) and the non-precision control interval (first interval) to increase the tundish moving speed in the non-precision control interval, thereby shortening the casting preparation time And can precisely control precisely within the precise control section.

The nozzle 140 is disposed under the tundish 110 and is capable of spraying the molten metal. That is, the molten metal stored in the tundish 110 can be dropped at a predetermined speed to a specific portion of the cooling roll 120. When the tundish 110 ascends and descends, the nozzle 140 can also ascend and descend.

The gap measuring unit 150 may measure a gap between the nozzle 140 and the cooling roll 120 when the tundish 110 is located in the second section. For example, while the tundish 110 is falling in the second section, the rate of change of the gap per hour can be measured. Further, while the tundish 110 is spraying the stored molten metal, the gap can be measured more finely.

The method for measuring the gap between the nozzle 140 and the cooling roll 120 may include a method of using a linear variable differential transformer (LVDT), a laser using method, an eddy current sensor using method, an X- -ray) and the method of using a video camera.

The gap controller 160 can control the gap between the nozzle 140 and the cooling roll 120 based on the gap measured by the gap measuring unit 150. [ For example, while the tundish 110 is descending in the second section, the target descending speed may be sent to the controller 130 based on the change rate of the gap per hour. Accordingly, the controller 130 can determine the force to be applied to the tundish 110 based on the target descending speed.

Also, while the tundish 110 is spraying the stored molten metal, the control unit 130 may send a signal to raise or lower the tundish 110 based on the finely measured gap. Accordingly, the control unit 130 can determine the direction of the force to be finely applied to the tundish 110 based on the received up / down signal.

Meanwhile, according to the design of the tundish position controller, the gap controller 160 and the controller 130 can be implemented in one controller. That is, both the control of the tundish 110 and the control of the gap can be performed in one controller.

The sensing unit 170 may sense at least one of temperature, weight, level of the molten metal stored in the tundish 110, rotation speed of the cooling roll, and occurrence of an emergency situation. Accordingly, the control unit 130 can control the tundish 110 based on the detection result of the sensing unit 170. [ That is, the detection target of the sensing unit 170 may be a turning point at which the casting condition is changed.

Hereinafter, the details of the casting situation and the turning point will be described with reference to Fig. 2 and Fig.

2 is a view showing the position and movement of the tundish before the tundish blows the molten metal.

In the casting preparation situation, which is the first casting situation, the tundish 110 and the nozzle 120 can wait at the position of (1). Here, the molten metal stored in the tundish 110 may be heated until it reaches the target temperature or more.

The sensing unit 170 may sense the temperature of the molten metal and the controller 130 may lower the tundish 110 to the standby position after the temperature of the molten metal sensed by the sensing unit 170 rises above the target temperature . Here, the waiting position 2 may be a boundary between a second section, which is a detectable section of the gap measuring section 150, and a first section, which is not a detectable section of the measuring section 150.

The cooling roll 120 starts to rotate after the tundish 110 descends to the standby position and the control unit 130 controls the rotation of the cooling roll sensed by the sensing unit 170 The tundish 110 can be lowered from the standby position 2 to the position (3) after the speed becomes higher than the target speed. Here, the controller 130 and the gap controller 160 may be a precise control mode for maintaining the gap at a constant value. For example, the control unit 130 and the gap control unit 160 in the precise control mode can control the gaps even in the fine movement of the cooling roll 120, such as eccentricity and vibration.

When the tundish 110 moves rapidly from the standby position 2 to the position (3), the tundish 110 may generate a large vibration due to the weight of the tundish or the movement of the molten metal in the tundish . Further, the gap between the nozzle 140 and the cooling roll 120 can be largely changed by a large vibration. Therefore, by moving the tundish 110 slowly from the standby position 2 to the position (3) and performing the precise control mode, the vibration generated in the tundish 110 can be greatly reduced and the gap can be precisely Lt; / RTI >

On the other hand, the controller 130 may raise the tundish 110 when the sensing unit 170 senses an unexpected condition. That is, if the sensing unit 170 senses an unexpected state, the controller 130 can quickly switch from the first casting state to the third casting state. Here, the emergency situation includes a dangerous situation such as abrupt interference of the interference equipment and scattering of the molten metal in a state where the tundish 110 is descending to the precise control mode.

3 is a view showing the position and movement of the tundish after the molten metal injection of the tundish is started.

In a casting situation, which is the second casting situation, the tundish 110 is located at the position (4) and can spray the molten metal stored in the tundish to the cooling roll 120. At this time, the controller 130 and the gap controller 160 may be a precise control mode for maintaining the gap at a constant value.

Here, the control unit 130 may raise the tundish 110 after the weight or the level detected by the sensing unit 170 reaches a minimum value. That is, while the tundish 110 injects the molten metal into the cooling roll 120, the weight or level of the molten metal stored in the tundish gradually decreases. Thereafter, the tundish 110 can spray the molten metal until it can no longer spray the molten metal. For example, the control unit 130 may set the weight of the tundish or the water level of the molten metal when the tundish 110 can no longer spray the molten metal to a minimum value. The minimum value may be the weight of the tundish or the level of the molten metal when the molten metal stored in the tundish 110 is completely empty and the weight of the tundish when the molten metal stored in the tundish 110 is slightly decreased Or the water level of the molten metal.

In addition, the controller 130 may raise the tundish 110 when the sensing unit 170 senses an unexpected condition. That is, if the sensing unit 170 senses an unexpected situation, the controller 130 can quickly switch from the second casting state to the casting completion state, which is the third casting state. Here, the emergency situation includes a dangerous situation such as abrupt interference of the interference equipment and scattering of the molten metal when the molten metal stored in the tundish 110 is larger than the minimum value.

In the casting completion state, which is the third casting situation, the tundish 110 can quickly move to the standby position 5. [ In casting completion, the tundish 110 may receive additional interference from other devices. Therefore, the control unit 130 can quickly move the tundish 110 to the standby position 5. [

Hereinafter, a tundish position control method according to an embodiment of the present invention will be described. The tundish position control method according to an embodiment of the present invention can be performed in the tundish position control apparatus 100 described above with reference to the above description, so that the same or corresponding contents as the above- .

4 is a flowchart illustrating a tundish position control method according to an embodiment of the present invention.

Referring to FIG. 4, the tundish gap control method according to an embodiment of the present invention includes a first movement step S10, a second movement step S20, a molten metal injection step S30, and a return step S40 .

The tundish position control device in the first movement step (S10) can move the tundish storing the molten metal to the standby position.

The tundish position control device in the second movement step (S20) can move the tundish located at the standby position to the target position. In addition, the tundish moving speed in the second moving step S20 may be slower than the tundish moving speed in the first moving step S10. In addition, the tundish position control device in the second movement step (S20) may control the tundish position control device to move the tundish at a moving speed slow enough to vibrate the tundish at a displacement smaller than half the gap between the nozzle and the cooling roll The tundish can be moved to the target position.

In the tundish position control device in the molten metal injection step (S30), the tundish located at the target position can spray the molten metal stored in the tundish to the cooling roll.

The tundish position control device in the returning step S40 can return the tundish located at the target position to the standby position. Also, the tundish position controller in the returning step S40 may move the tundish faster than the tundish moving speed of the second moving step S20.

5 is a flowchart showing a tundish position control method up to the second movement step of the tundish.

Referring to FIG. 5, the tundish gap control method according to an embodiment of the present invention may further include a temperature sensing step S11 and a cooling roll rotating step S21.

The tundish position controller in the temperature sensing step S11 can sense the temperature of the molten metal stored in the tundish. Accordingly, the tundish position controller in the first movement step S10 can move the tundish to the standby position after the temperature detected in the temperature sensing step S11 is raised to the target temperature or higher.

The tundish position control device in the cooling roll rotating step S21 can rotate the cooling roll to the target speed after the tundish moves to the standby position by the first moving step S10. Accordingly, the tundish position control device in the second movement step (S20) can move the tundish to the target position while the cooling roll is rotating at the target speed.

6 is a flowchart showing a tundish position control method after the second moving step of the tundish.

6, a tundish gap control method according to an embodiment of the present invention includes a gap measurement step S50, a gap control step S60, an unexpected situation sensing step S70, and a melt sensing step S80. .

The tundish position control device in the gap measuring step S50 can measure the gap between the nozzle and the cooling roll included in the tundish in the second moving step S20 and the molten metal spraying step S30.

The tundish position controller in the gap control step (S60) can control the gap between the nozzle and the cooling roll based on the gap measured in the gap measuring step (S50).

The tundish position control device in the unexpected condition sensing step S70 can detect the occurrence of an emergency situation while the tundish dispenses the molten metal stored in the tundish to the cooling roll. Accordingly, the tundish position control device in the second movement step S20, the molten metal injection step S30 and the returning step S40, when detecting the unexpected situation in the unexpected situation sensing step S70, It is possible to return to the standby position.

The tundish position control device in the molten metal sensing step S80 may sense at least one of the weight and the level of the molten metal stored in the tundish. Accordingly, the tundish position control device in the returning step S40 may set the tundish to the standby position after the weight or the level detected in the sensing step S80 becomes the minimum value (or after the remaining molten metal is detected) Can be returned.

7 is a graph showing a tundish moving speed according to a tundish position coordinate axis in the tundish position control apparatus and method.

The descending speed of the tundish in the first section may be set in the range of 0.5 mm / sec to 1 mm / sec, and the descending speed of the tundish in the second section may be set in the range of 0.1 mm / sec to 0.2 mm / sec .

If the descending speed of the tundish is excessively high in the second section, scattering of the molten metal due to abrupt change in the gap, collision of the nozzle 140 and the cooling roll 120, and the like may occur. In addition, if the descending speed of the tundish in the second section is excessively slow, it is difficult to cope with the change of the gap due to the progress of the operation. The vibration of the tundish 110, the vibration of the cooling roll 120, It may be difficult to compensate for the sudden change in the gap due to the change in the gap.

In addition, even in the second section, the section can be divided into a plurality of sections according to the distance between the cooling roll 120 and the nozzle 140. For example, when the tundish approaches the target position, the descending speed of the tundish can be changed from 0.2 mm / sec to 0.1 mm / sec.

On the other hand, when the tundish is located at the target position, the gap between the cooling roll and the nozzle may range from 0.15 mm to 1 mm. Here, the shorter the gap when the tundish is located at the target position, the slower the descending speed of the tundish in the second section may be.

8 is a graph showing coordinate axes of tundish positions according to the tundish operation time in the tundish position controller and method.

The movement of the tundish can be minimized by precisely controlling the gap of the tundish during waiting (during the melting of the molten metal) and during operation (during the molten metal injection), which is the time when the tundish 110 is located at the target position.

After the end of the operation (after the molten metal is sprayed), the tundish 110 can quickly move from the target position to the standby position. Here, the rising speed of the tundish can be set in the range of 0.5 mm / sec to 1 mm / sec, which is the falling speed of the tundish in the first section.

The present invention is not limited to the above-described embodiments and the accompanying drawings. It will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: tundish position control device 110: tundish
120: cooling roll 130:
140: nozzle 150: gap measuring unit
160: gap controller 170:
S10: first moving step S11: temperature sensing step
S20: second moving step S21: cooling roll rotating step
S30: molten metal injection step S40: return step
S50: Gap measurement step S60: Gap control step
S70: Detecting the unexpected situation S80: Detecting the molten metal

Claims (18)

A tundish storing molten metal therein;
A cooling roll disposed below the tundish to cool the molten metal discharged from the tundish; And
A control unit for controlling the position of the tundish by moving the tundish up and down; Lt; / RTI >
Wherein the control unit controls the tundish lowering speed of the tundish in a second section in which the distance between the tundish and the cooling roll is smaller than a specific value in a first section in which the distance between the tundish and the cooling roll is greater than a specific value And controls the position of the tundish by making the speed of the tundish lower than that of the tundish.
The method according to claim 1,
A nozzle disposed at a lower portion of the tundish to spray the molten metal;
A gap measuring unit for measuring a gap between the nozzle and the cooling roll when the tundish is located in the second section; And
A gap controller for controlling a gap between the nozzle and the cooling roll based on the gap measured by the gap measuring unit; Further comprising:
3. The method of claim 2,
Wherein the control unit controls the tundish position control to lower the tundish at a moving speed that is slow enough that the tundish oscillates at a displacement smaller than half the gap between the nozzle and the cooling roll while the tundish descends in the second section, Device.
The method according to claim 1,
Wherein the control unit sets the rising / falling speed of the tundish when the tundish is located in the first section in a range of 0.5 mm / sec to 1 mm / sec,
And a descending speed of the tundish when the tundish is located in the second section is set in a range of 0.1 mm / sec to 0.2 mm / sec.
The method according to claim 1,
Further comprising a sensing unit for sensing at least one of a temperature, a weight, a level of the molten metal stored in the tundish, a rotation speed of the cooling roll, and an occurrence of an emergency situation,
Wherein the control unit controls the tundish based on the detection result of the sensing unit.
6. The method of claim 5,
The cooling roll starts to rotate after the tundish descends to the standby position,
Wherein the control unit lowers the tundish at a standby position after the rotation speed of the cooling roll sensed by the sensing unit becomes higher than a target speed.
6. The method of claim 5,
Wherein the control unit lowers the tundish to a standby position after the temperature sensed by the sensing unit rises above a target temperature.
6. The method of claim 5,
Wherein the control unit raises the tundish after the weight or the level detected by the sensing unit reaches a minimum value.
6. The method of claim 5,
Wherein the control unit raises the tundish when an unexpected condition is detected in the sensing unit.
A first moving step of moving a tundish storing a molten metal to a standby position;
A second moving step of moving the tundish located at the standby position to a target position;
A molten metal spraying step of spraying a molten metal stored in the tundish to a cooling roll at a tundish located at the target position; And
Returning the tundish at the target position to the standby position; Lt; / RTI >
Wherein the tundish moving speed of the second moving step is slower than the tundish moving speed of the first moving step.
11. The method of claim 10,
A gap measuring step of measuring a gap between the nozzle and the cooling roll included in the tundish in the second moving step and the molten metal jetting step; And
A gap control step of controlling a gap between the nozzle and the cooling roll based on the gap measured in the gap measuring step; Further comprising the steps of:
12. The method of claim 11,
Wherein the second movement step moves the tundish to a target position at a moving speed that is slow enough for the tundish to oscillate at a displacement less than half the gap between the nozzle and the cooling roll while the tundish moves, Way.
12. The method of claim 11,
The tundish moving speed of the second moving step is in the range of 0.1 mm / sec to 0.2 mm / sec,
Wherein a gap between a nozzle of the tundish located at the target position and the cooling roll is in a range of 0.15 mm or more and 1 mm or less.
11. The method of claim 10,
Wherein the returning step moves the tundish faster than the tundish moving speed of the second moving step.
11. The method of claim 10,
Further comprising a temperature sensing step of sensing a temperature of the molten metal stored in the tundish,
Wherein the first movement step moves the tundish to a standby position after the temperature sensed in the temperature sensing step rises above a target temperature.
11. The method of claim 10,
Further comprising a cooling roll rotating step of rotating the cooling roll at a target speed after the tundish moves to a standby position by the first moving step,
Wherein the second moving step moves the tundish to a target position while the cooling roll is rotating at a target speed.
11. The method of claim 10,
Further comprising a molten metal sensing step of sensing at least one of a weight and a level of the molten metal stored in the tundish,
Wherein the returning step returns the tundish to the standby position after the weight or the level detected in the sensing step is the minimum value.
11. The method of claim 10,
Further comprising an unexpected condition detecting step of detecting occurrence of an emergency situation while the tundish dispenses the molten metal stored in the tundish to the cooling roll,
Wherein the returning step returns the tundish to a standby position when an unexpected situation is detected in the unexpected situation detection step.

Images