KR101585783B1 - Tundish gap control apparatus and method - Google Patents

Abstract

An embodiment of the present invention relates to a tundish gap control apparatus and a tundish gap control method. The present invention performs accurate control of a nozzle gap by modeling a three dimensional relation between the nozzle gap and a position of a tundish cylinder by providing the tundish gap control apparatus comprising: a tundish which accommodates a molten alloy in an inside thereof; a nozzle which discharges the molten alloy by being arranged on a lower part of the tundish; a cooling wheel arranged on a lower part of the nozzle, cooling the molten alloy discharged from the nozzle; a pair of tundish cylinders arranged on both sides of the tundish; a gap measurement part which measures a gap with the cooling wheel on both sides of the nozzle; and a gap control part which controls gaps measured by the gap measurement part by elevating each of the pair of tundish cylinders based on the measurement value of both sides of the gap measurement part.

Description

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

The present invention relates to a tundish gap control apparatus and a tundish gap control method.

Generally, amorphous alloys (hereinafter referred to as amorphous alloys) 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 the 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 alloy requires a rapid cooling rate of 10 ⁵ K / s or more, so only a small amount of the molten alloy is discharged to the cooling wheel and rapidly cooled. Controlling the fine gaps between the nozzle for discharging the molten alloy and the cooling wheel is necessary in order to discharge the molten alloy to the cooling wheel by controlling the amount of the molten alloy.

However, there may arise a problem that the gap is irregularly changed during operation due to the thermal expansion of the tundish shell, the nozzle, or the thermal expansion of the cooling wheel. Thus, a gap between the nozzle and the cooling wheel is required, and a device and a method are required to make a uniform thickness of the strip or fiber by keeping the nozzle horizontal with respect to the cooling wheel to make the gap between the nozzle and the cooling wheel uniform .

In order to solve the above problems, an embodiment of the present invention provides a tundish gap controller and a tundish gap controller.

A tundish gap controller according to an embodiment of the present invention includes: a tundish housing a molten alloy therein; A nozzle disposed below the tundish to discharge the molten alloy; A cooling wheel disposed below the nozzle to cool the molten alloy discharged from the nozzle; A pair of tundish cylinders disposed on both sides of the tundish; A gap measuring unit for measuring a gap between the cooling wheel and the cooling wheel at both sides of the nozzle; And a gap controller for controlling the gaps measured by the gap measuring unit by raising and lowering the pair of tundish cylinders based on the measured values on both sides of the gap measuring unit. . ≪ / RTI >

The apparatus further includes a cylinder measuring unit for measuring at least one of a displacement of the pair of cylinders, a speed of the pair of cylinders, and a force of the pair of cylinders, and the gap control unit calculates, based on the measured value of the cylinder measuring unit, And the gaps measured by the gap measuring unit can be controlled by raising and lowering the tundish cylinders, respectively.

The gap controller may set a plurality of operating points having different values measured by the cylinder measuring unit and linearly control the pair of tundish cylinders around each operating point.

In addition, the control of the gap controller can be modeled as a state-space.

The tundish gap control method according to an embodiment of the present invention is a method for controlling at least one of a displacement x1 of a first cylinder included in a tundish, a speed x1 'of a first cylinder, and a force u1 applied to the first cylinder Measuring a first cylinder; A second cylinder measuring step of measuring at least one of a displacement x2 of the second cylinder included in the tundish, a speed x2 'of the second cylinder and a force u2 of the second cylinder; Measuring a gap y1 between the right portion of the nozzle included in the tundish and the cooling wheel and measuring a gap y2 between the left portion of the nozzle included in the tundish and the cooling wheel; A gap control step of controlling the first cylinder and the second cylinder by elevating and respectively controlling y1 and y2 based on the values of x1, x1 ', u1, x2, x2', u2, y1 and y2; . ≪ / RTI >

According to the present invention, precise control of the nozzle gap can be performed by modeling the three-dimensional relationship between the position of the tundish cylinder and the nozzle gap.

1 is a schematic front view showing a tundish gap control apparatus according to an embodiment of the present invention.
2 is a schematic side view showing a tundish gap control device according to an embodiment of the present invention.
3 is a diagram illustrating a control of a gap controller included in a tundish gap controller according to an embodiment of the present invention.
4 is a diagram illustrating a problem to be solved by the tundish gap controller according to an embodiment of the present invention.
5 is a flowchart illustrating a tundish gap control method according to an embodiment of the present invention.

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, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' . Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

FIG. 1 is a schematic front view showing a tundish gap control apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic side view illustrating a tundish gap control apparatus according to an embodiment of the present invention.

The tundish gap controller 100 according to an embodiment of the present invention includes a tundish 110, a nozzle 120, a cooling wheel 130, a gap measuring unit 140, a pair of tundish cylinders 151 152, a gap control unit 160, and a cylinder measuring unit 171, 172.

The tundish 110 is capable of receiving a molten alloy therein. Here, the molten alloy may be used for producing an amorphous alloy using melt spinning. The tundish 110 can move up and down.

The nozzle 120 may be disposed under the tundish 110 to discharge the molten alloy. That is, the molten alloy contained in the tundish 110 can be dropped at a predetermined speed to a specific portion of the cooling wheel 130. When the tundish 110 ascends and descends, the nozzle 120 can also ascend and descend.

The cooling wheel 130 is disposed at a lower portion of the nozzle 120 to rapidly cool the molten alloy discharged from the nozzle 120. For example, the molten alloy is rapidly cooled while being discharged onto the circumferential surface of the cooling wheel 130 rotating at high speed through the nozzle 120, and is made of a strip or a fiber having a constant width and thickness to maintain an amorphous state .

The gap measuring unit 140 may measure a gap between the right portion of the nozzle 120 and the cooling wheel 130 and measure a gap between the left portion of the nozzle 120 and the cooling wheel 130 have.

A method of using a linear variable differential transformer (LVDT), a method of using a laser, a method of using an eddy current sensor, a method of using an X-ray X -ray) and the method of using a video camera.

A pair of tundish cylinders 151 and 152 may be disposed on both sides of the tundish 110. [ That is, one tundish cylinder 151 may be disposed on the right side of the tundish 110, and another tundish cylinder 152 may be disposed on the left side of the tundish 110.

The gap controller 160 controls the gaps measured by the gap measuring unit 140 based on the measured values of both directions of the gap measuring unit 140 so that the pair of tundish cylinders 151 and 152 are controlled can do.

By keeping the nozzle 120 horizontal relative to the cooling wheel 130 to keep the gap between the nozzle and the cooling wheel constant, the tundish gap control apparatus 100 can produce strips or fibers of uniform thickness. Thus, by moving one of the pair of tundish cylinders 151 and 152 up and down, the nozzle 120 can be kept horizontal with respect to the cooling wheel 130.

For example, by measuring the gap measuring section 140, it can be determined that the gap between the right portion of the nozzle 120 and the cooling wheel 130 is larger than the gap between the left portion of the nozzle 120 and the cooling wheel 130 . At this time, the gap control unit 160 can control the descent of the right turn dish cylinder 151 and / or the rise of the left turn dish cylinder 152. [

The gap control unit 160 controls the gap between the right portion of the nozzle 120 and the cooling wheel 130 and the gap between the left portion of the nozzle 120 and the cooling wheel 130 to be constant . For example, when the average gap between the nozzle 120 and the cooling wheel 130 is 200 占 퐉, the gap controller 160 can continuously control the left-right gap deviation to be? 150 占 퐉 or less. The details of the control performed by the gap controller 160 will be described later with reference to FIG.

The cylinder measuring sections 171 and 172 can measure at least one of displacement, speed of the pair of cylinders 151 and 152, and force applied to the pair of cylinders. The gap control unit 160 may raise or lower the right turn dish cylinder 151 or the left turn dish cylinder 152 based on the measured values of the cylinder measuring units 171 and 172, 140). ≪ / RTI >

For example, when the measurement values of the cylinder measuring units 171 and 172 are used, the gap control unit 160 can determine the magnitude of the force to be applied to the pair of cylinders 151 and 152. Therefore, the gap controller 160 can control the elevation of the pair of cylinders 151 and 152 more accurately.

3 is a diagram illustrating a control of a gap controller included in a tundish gap controller according to an embodiment of the present invention.

3, the tundish gap controller 100 controls the gaps y1 and y2 between the nozzle 120 and the cooling wheel 130 by raising and lowering the positions x1 and x2 of the tundish cylinder, respectively . To this end, the gap controller 160 can find a three-dimensional relationship between the position (x1, x2) of the tundish cylinder and the gap (y1, y2). Here, the gap controller 160 may calculate the gap control amount using the three-dimensional relationship and the PID algorithm.

Hereinafter, a process of finding a three-dimensional relationship between the positions (x1, x2) of the tundish cylinder and the gaps (y1, y2) will be described in detail.

First, the gap controller 160 may convert the Inventor 3D CAD file describing the mechanical configuration of the device to enable simulation in a Matlab Simulink environment using Matlab Simmechanics. Here, the gap controller 160 may apply a force to the tundish cylinders x1 and x2 in the Simulink to adjust the design so that the nozzle 120 in a stopped state can perform a desired operation.

Second, since the model converted by the gap controller 160 is a non-linear model, the gap controller can linearize the model to control the gap between the nozzle and the cooling wheel. That is, the gap controller can linearize the specific operating point by setting a plurality of specific operating points of the pair of tundish cylinders 151 and 152. That is, the gap controller extracts a state-space model between the positions (x1, x2) and the gaps (y1, y2) of the tundish cylinder, 151 and 152 can be linearly controlled.

For example, when the range of displacement of the pair of cylinders 151 and 152 is 100 mm and the speed range of the pair of cylinders is 5 mm / s, the gap controller 160 sets 200 operating points, It is possible to control the pair of tundish cylinders linearly around the operating point of the tundish cylinder.

Third, the gap controller 160 completes the kinetic model of the pair of tundish cylinders 151 and 152, and controls the pair of tundish cylinders 151 and 152.

Specifically, the control of the gap controller 160 can be performed by the following equations (1) and (2). Here, x, x ', u, y, A, B, and C in Equation (2) can be expressed by a matrix of Equation (3) below. Wherein x1 is the displacement of at least one of the plurality of first tundish cylinders, x2 is the displacement of at least one of the plurality of second tundish cylinders, x1 ' Is the velocity of at least one of the first tundish cylinders, x2 'is the velocity of at least one of the plurality of second tundish cylinders, and u1 is the velocity of at least one of the plurality Is the acceleration experienced by at least one of the first tundish cylinders of the first tundish cylinder, u2 is the acceleration experienced by the at least one second tundish cylinder of the plurality of second tundish cylinders, y1 is the acceleration A2, a33, a34, a41, a42, a43, a44, b31, b32, b41, b42, b41, b42 and a cooling wheel, c11, c12, c21, c22 are determined according to state space modeling Is a constant.

For example, the gap controller 160 sets an operating point where the positions (x1, x2) and gaps (y1, y2) of the tundish cylinder are [0.1267 0.0279 0.0249 0.0056] The constants can be extracted with the following values.

a31 = 0.001412, a32 = -0.001412, a33 = 0.00292, a34 = -0.00292,

a41 = 0.0002828, a42 = -0.0002828, a43 = 0.008925, a44 = -0.008925,

b31 = -0.00595, b32 = 0.01846, b41 = 0.01769, b42 = -0.00595,

c11 = 572.5, c12 = 427.5, c21 = 365.6, c22 = 634.4

That is, the gap controller 160 extracts constants included in the matrix A, B, and C, assuming that the relationship between (x1, x2) and (y1, y2) the positions (x1, x2) and the gaps (y1, y2) of the tundish cylinder can be controlled using the values of c12, c21, c22.

4 is a diagram illustrating a problem to be solved by the tundish gap controller according to an embodiment of the present invention.

4, when the tundish gap controller 100 moves the pair of tundish cylinders up and down, the center of gravity (position A) does not coincide with the tundish cylinder operating position (position B) Vibration may be caused by the torque generated by the rotational component of the acting force. Therefore, it may become difficult to grasp the relationship between the position of the tundish cylinder and the position where the nozzle 120 is attached.

In order to solve this problem, the cylinder measuring units 171 and 172 can measure not only the position of the pair of tundish cylinders 151 and 152 but also the speed and the receiving force. The gap controller 160 can calculate the three-dimensional relationship between the gap of the nozzle 120 and the position of the tundish cylinder in consideration of the position and speed of the pair of tundish cylinders 151 and 152 have.

Hereinafter, a tundish gap control method according to an embodiment of the present invention will be described. The tundish gap control method according to an embodiment of the present invention can be performed in the tundish gap control apparatus 100 described above with reference to the above description, .

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

The tundish gap control method according to an embodiment of the present invention may include a first cylinder measurement step S10, a second cylinder measurement step S20, a gap measurement step S30, and a gap control step S40 have.

In the first cylinder measuring step (S10), the tundish gap controller calculates at least one of a displacement x1 of the first cylinder included in the tundish, a velocity x1 'of the first cylinder and a force u1 of the first cylinder One can measure.

 In the second cylinder measuring step S20, the tundish gap control device calculates at least one of the displacement x2 of the second cylinder included in the tundish, the velocity x2 'of the second cylinder, and the force u2 of the second cylinder One can measure.

In the gap measuring step S30, the tundish gap controller measures y1, which is the gap between the right part of the nozzle included in the tundish and the cooling wheel, and calculates the gap between the left part of the nozzle included in the tundish and the cooling wheel y2 can be measured.

In the gap control step S40, the tundish gap controller raises and lowers the first cylinder and the second cylinder on the basis of the values of x1, x1 ', u1, x2, x2', u2, y1 and y2, , y2 can be controlled.

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 gap control device 110: Tundish
120: nozzle 130: cooling wheel
140: gap measuring unit 151: first tundish cylinder
152: first tundish cylinder 160: gap control unit
171 and 172:

Claims (8)

A tundish housing a molten alloy therein;
A nozzle disposed below the tundish to discharge the molten alloy;
A cooling wheel disposed below the nozzle to cool the molten alloy discharged from the nozzle;
A pair of tundish cylinders disposed on both sides of the tundish;
A gap measuring unit for measuring a gap between the cooling wheel and the cooling wheel at both sides of the nozzle; And
A gap controller for raising and lowering the pair of tundish cylinders based on the measured values of both sides of the gap measuring unit to control the gaps measured by the gap measuring unit; Lt; / RTI >
The gap control unit calculates the following differential equation:

To a state-space,
Where x is the displacement of the tundish cylinder, x 'is the velocity of the tundish cylinder, u is the acceleration experienced by the tundish cylinder, y is the gap of the nozzle, A, B and C are constants Dish gap controller.
The method according to claim 1,
Further comprising a cylinder measuring section for measuring at least one of a displacement, a speed of the pair of cylinders, and a force received by the pair of cylinders,
Wherein the gap control unit controls the gap measured by the gap measuring unit by raising and lowering the pair of tundish cylinders based on the measurement value of the cylinder measuring unit.
3. The method of claim 2,
Wherein the gap controller sets a plurality of operating points having different values measured by the cylinder measuring unit,
Wherein the pair of tundish cylinders are linearly controlled around each operating point.
The method of claim 3,
The gap control unit sets 200 operating points when the displacement range of the pair of tundish cylinders is 100 mm and the speed range of the pair of tundish cylinders is 5 mm / s,
Wherein the pair of tundish cylinders are linearly controlled around each operating point.
delete A first cylinder measuring step of measuring at least one of a displacement x1 of the first cylinder included in the tundish, a speed x1 'of the first cylinder and an acceleration u1 of the first cylinder;
A second cylinder measuring step of measuring at least one of a displacement x2 of a second cylinder included in the tundish, a velocity x2 'of the second cylinder and an acceleration u2 of the second cylinder;
Measuring a gap y1 between the right portion of the nozzle included in the tundish and the cooling wheel and measuring a gap y2 between the left portion of the nozzle included in the tundish and the cooling wheel; And
a gap control step of raising and lowering the first cylinder and the second cylinder respectively based on the values of x1, x1 ', u1, x2, x2', u2, y1, y2 to control y1, y2; Lt; / RTI >
When the control of the gap control step is modeled into a state space,

And is expressed by the differential equation of
X, x ', u, y, A, B, and C satisfy the following matrix:

Lt; / RTI >
Wherein a31, a32, a33, a34, a41, a42, a43, a44, b31, b32, b41, b42, c11, c12, c21, c22 are constants determined according to state space modeling.
The method according to claim 6,
Wherein the gap control step sets a plurality of operating points having different values of x1, x1 ', x2, and x2'
And controlling the first cylinder and the second cylinder linearly around the respective operating points.
delete

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