KR20170073384A - System and method for measuring gap between nozzle and cooling roll - Google Patents

System and method for measuring gap between nozzle and cooling roll Download PDF

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Publication number
KR20170073384A
KR20170073384A KR1020150182239A KR20150182239A KR20170073384A KR 20170073384 A KR20170073384 A KR 20170073384A KR 1020150182239 A KR1020150182239 A KR 1020150182239A KR 20150182239 A KR20150182239 A KR 20150182239A KR 20170073384 A KR20170073384 A KR 20170073384A
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KR
South Korea
Prior art keywords
nozzle
cooling roll
light
camera
wavelength band
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KR1020150182239A
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Korean (ko)
Inventor
유황열
유기성
김종국
Original Assignee
주식회사 포스코
재단법인 포항산업과학연구원
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Application filed by 주식회사 포스코, 재단법인 포항산업과학연구원 filed Critical 주식회사 포스코
Priority to KR1020150182239A priority Critical patent/KR20170073384A/en
Publication of KR20170073384A publication Critical patent/KR20170073384A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/01—Continuous casting of metals, i.e. casting in indefinite lengths without moulds, e.g. on molten surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • B22D11/185—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by using optical means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Continuous Casting (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

To a gap measurement system and method between a nozzle and a cooling roll.
A gap measurement system between a nozzle and a cooling roll includes an illumination device for irradiating a light of a specific wavelength band to a lower portion of the nozzle and an upper portion of the cooling roll, A band pass filter coupled to the camera for transmitting light of the specific wavelength band from the light incident on the camera to an image pickup plane of the camera, And a controller for detecting the upper edge of the cooling roll and measuring the distance between the lower edge of the nozzle and the upper edge of the cooling roll as a gap between the nozzle and the cooling roll.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a gap measurement system for a gap between a nozzle and a cooling roll,

Embodiments relate to a gap measurement system and method thereof between a nozzle and a cooling roll, and more particularly to a gap measurement system and method for measuring a gap between a nozzle and a cooling roll in a single roll manufacturing facility.

According to the single-roll method, molten metal discharged through a nozzle is rapidly cooled and solidified by a cooling roll rotating, and is made of a strip / fiber having a certain width and thickness.

The thickness and quality characteristics of the strip / fiber produced by the single roll method are affected by various factors such as the temperature of the molten metal, the rotation speed of the cooling roll, the injection rate of the molten metal, and the distance (gap) between the nozzle and the cooling roll . Of these, the gap between the nozzle and the cooling roll is a factor that finely controls the quality of the strip / fiber that is difficult to control but solidifies rapidly. If the gap is too large, the thickness of the quenched solidified strip / fiber becomes too thick and crystallization of the strip / fiber may progress due to the lowered cooling rate. On the other hand, if the gap is too small, the thickness of the quenched and solidified strip / fiber becomes too thin to cause breakage or clogging of the opening of the nozzle, and the manufacturing process may be interrupted.

Therefore, in order to produce a strip / fiber of good thickness and quality, it is necessary to maintain a constant gap between the nozzle and the cooling roll.

On the other hand, during the manufacturing process of the strip / fiber by the single roll method, the nozzle may be heated and expanded due to the preheating process and the molten metal at a high temperature. The expansion of the nozzle causes a change in the gap between the nozzle and the cooling roll. Therefore, even if the gap between the nozzle and the cooling roll is set accurately at the beginning of the process, it is necessary to change the position of the nozzle in accordance with the gap change occurring during the process.

This requires a system for accurately measuring the gap change between the nozzle and the cooling roll during the process.

An object to be solved by the embodiments is to provide a gap measuring system and method therefor between a nozzle and a cooling roll for accurately measuring a gap between a nozzle and a cooling roll.

According to an aspect of the present invention, there is provided a gap measurement system for a gap between a nozzle and a cooling roll, comprising: a camera for capturing an image by photographing a lower portion of the nozzle and an upper portion of the cooling roll; A bandpass filter coupled to the camera for transmitting the light of the specific wavelength band to the image sensing plane of the camera among light incident on the camera, And a control unit for detecting the lowermost edge of the nozzle and measuring the gap between the nozzle and the cooling roll based on the lowermost edge of the nozzle.

According to another aspect of the present invention, there is provided a method of measuring a gap between a nozzle and a cooling roll, comprising the steps of: irradiating light of a specific wavelength band to a lower portion of the nozzle and an upper portion of the cooling roll through a lighting device; Obtaining a photographed image of a region irradiated with the light of the specific wavelength band in the nozzle and the cooling roll through a camera coupled with a band-pass filter that transmits light of a predetermined wavelength band from the image; And measuring a gap between the nozzle and the cooling roll based on the lowermost edge of the nozzle.

According to the embodiment, the nozzle edge can be accurately detected even while discharging the molten metal. Accordingly, it is possible to accurately control the gap between the nozzle and the cooling roll during casting of the product, thereby reducing the variation in the thickness of the product, thereby contributing to the improvement of product quality.

Fig. 1 is an enlarged view showing the relationship between the nozzle and the cooling roll in the single-roll process.
Figure 2 schematically shows a gap measurement system between a nozzle and a cooling roll according to an embodiment.
3 shows an example of the coupling structure between the optical film and the camera in the gap measuring system according to the embodiment.
4 is a block diagram schematically showing a control apparatus of a gap measurement system according to an embodiment.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the embodiments of the present invention, portions that are not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between .

1 is an enlarged view showing a relationship between a nozzle and a cooling roll in a single-roll casting facility.

Referring to FIG. 1, a nozzle 10 is coupled to a lower portion of a tundish (not shown), and melts the molten metal 5 in the tundish to an outer circumferential surface of a cooling roll 30 Spray. The molten metal 5 discharged to the outer circumferential surface of the cooling roll 20 by the nozzle 10 can be quenched and solidified by the cooling roll 20 and cast into a strip or fiber.

When the molten metal 5 starts to be discharged from the nozzle 10, light emitted by the molten metal at a high temperature and light reflected by the cooling roll 20 are generated around the nozzle 10. As a result, the intensity of light around the nozzle 10 becomes extremely high, and a light saturation phenomenon occurs when a picture is taken between the nozzle 10 and the cooling roll 20 by a camera (not shown). The light saturation phenomenon causes a blurring in the photographed image of the camera. The blurring phenomenon makes it impossible to detect the edge portion of the nozzle 10 from the photographed image of the nozzle 10, thereby reducing the accuracy of the gap measurement between the nozzle 10 and the cooling roll 20.

In order to solve the above-mentioned problem and to improve the edge detection accuracy of the nozzle 10, the embodiment uses an illumination device for irradiating light of a specific wavelength band and an optical filter for passing only light of a specific wavelength band.

Hereinafter, a gap measuring system and method for measuring a gap between a nozzle and a cooling roll according to an embodiment will be described with reference to necessary drawings.

Figure 2 schematically shows a gap measurement system between a nozzle and a cooling roll according to an embodiment. 3 shows an example of the coupling structure between the optical film and the camera in the gap measuring system according to the embodiment. 4 is a block diagram schematically showing a control apparatus of a gap measurement system according to an embodiment.

2, a gap measurement system between a nozzle 10 and a cooling roll 20 according to an embodiment includes a lighting device 110, a camera 120, an optical filter 130, a control device 140, .

The lighting device 110 irradiates light to an area to be photographed by the camera 120. [ That is, the lighting apparatus 110 irradiates light to the lower portion of the nozzle 10 and the upper portion of the cooling roll 20. The illumination device 110 can irradiate light in the same irradiation direction as the shooting direction of the camera 120. [

The illumination device 110 irradiates light in a specific wavelength band. For example, the illumination device 110 can irradiate light in a wavelength band of 300 nm to 400 nm. This corresponds to a wavelength band in which energy is low in light emitted from a high-temperature heating element of 1000 ° C or higher.

The light emitted from the molten metal 5 and the light emitted from the molten metal 5 is reflected by the cooling roll 20 and is included in a region having a longer wavelength in the visible light region. Therefore, the illumination device 110 irradiates light of a short wavelength band of 300 nm to 400 nm so that the light irradiated by the illumination device 110 is distinguished from the divergent light from the molten metal 5.

The lighting apparatus 110 may irradiate light with an output of a predetermined wattage or more. For example, the lighting device 110 may illuminate light with an output greater than 9 watts. The light emitted from the molten metal 5 is very strong. Therefore, when the output of the lighting device 110 is low, the light irradiated by the lighting device 110 is canceled by the diverging light of the molten metal 5, so that when the nozzle 10 is photographed by the camera 120, The image of the lower end of the light guide plate 10 may be blurred and distorted.

The camera 120 photographs the lower portion of the nozzle 10 and the upper portion of the cooling roll 20 to obtain a gap image between the nozzle 10 and the cooling roll 20. The camera 120 can photograph the nozzle 10 and the cooling roll 20 in the same direction as the lighting device 110. [ That is, the camera 120 can photograph a region irradiated with light by the illumination device 110 in the nozzle 10 and the cooling roll 20.

The camera 120 may be arranged to be horizontally aligned with the top end surface of the cooling roll 20. That is, the camera 120 may be disposed so that the optical axis of the camera 120 passes through the uppermost end face of the cooling roll 20.

The optical filter 130 can transmit only light of a specific wavelength band from the illumination device 110 among lights incident on the camera 120 in combination with the camera 120. For example, the optical filter 130 can transmit only light in a wavelength band of 300 nm to 400 nm, which is the same wavelength band as the light illuminated by the illuminating device 110. To this end, the optical filter 130 may include a band-pass filter that transmits only light of a wavelength selectivity, that is, a specific wavelength band.

The optical filter 130 may use a method of removing light of other wavelength bands in order to pass only light of a specific wavelength band.

3, the optical filter 130 includes a filter 131 for removing light emitted from the molten metal 5, and a filter 132 for removing light reflected by the cooling roll 20, Only the light in the wavelength band can be passed. The divergent light of the molten metal (5) and the reflected light of the cooling roll (20) are also in the long wavelength band in the visible light range. The optical filter 130 includes a filter 131 that removes light emitted from the molten metal 5 and a filter 132 that removes light reflected by the cooling roll 20, It is possible to transmit only the light of the same wavelength band as the light irradiated from the illumination device 110 by removing the light.

3 illustrates an example in which the optical filter 130 is coupled to the incident surface of the lens unit 121 of the camera 120. However, the present invention is not limited thereto, Can be variously modified. For example, the optical filter 130 may be disposed inside the camera 120 between the lens portion 121 and the imaging surface (imaging element) of the camera 120. [ In this case, only the light of a specific wavelength band among the light incident through the lens unit 121 of the camera 120 can pass through the optical filter 130 to the imaging surface of the camera 120.

2, the controller 140 detects the lower edge of the nozzle 10 and the upper edge of the opposing cooling roll 20 from the image photographed through the camera 120. As shown in FIG.

Referring to FIG. 4, the controller 140 may include an edge detector 141 and a gap measurer 142.

When an image is input through the camera 120, the edge detecting unit 141 detects the lower edge of the nozzle 10 from the image. The lower edge (refer to reference numeral 11 in Fig. 1) of the nozzle 10 represents the edge of the lower end where the molten metal is discharged from the nozzle 10.

The edge detection unit 141 detects the upper edge of the cooling roll 20 from the image input through the camera 120. [ The upper edge of the cooling roll 20 represents the edge of the upper surface facing the lower end of the nozzle 10 in the cooling roll 20.

When an image is received from the camera 120, the edge detecting unit 141 performs an image processing such as a binarization process and then applies an edge detection algorithm or the like to detect the lower edge of the nozzle 10 and the upper edge of the cooling roll 20 can do.

The gap measuring unit 142 measures the distance between the lower edge of the nozzle 10 and the upper edge of the cooling roll 20 facing each other from the edge detecting unit 141, Thereby obtaining a gap between the rolls 20. The gap measuring unit 142 measures the gap between the lowermost edge of the nozzle 10 corresponding to the contact surface between the nozzle 10 and the molten metal puddle among the lower edge of the nozzle 10 and the uppermost edge of the upper edge of the cooling roll 20 The gap between the nozzle 10 and the cooling roll 20 can be obtained by measuring the distance between the edge corresponding to the portion.

The gap between the nozzle 10 and the cooling roll 20 obtained as described above is a reference for gap correction when the gap between the nozzle 10 and the cooling roll 20 changes due to the expansion of the nozzle 10 It can be used as a parameter.

FIG. 5 shows a gap measuring method between the nozzle and the cooling roll according to the embodiment.

5, the gap measuring system according to the embodiment controls the illumination device 110 to control the area to be photographed by the camera 120, that is, the lower end of the nozzle 10 and the upper part of the cooling roll 20 And irradiates the surface with light of a specific wavelength band (S100).

In step S100, the illumination device 110 may irradiate light having a short wavelength band of 300 nm to 400 nm so that the light emitted from the illumination device 110 and the light emitted from the molten metal are separated.

The gap measurement system obtains an image of the lower end of the nozzle 10 and the upper surface of the cooling roll 20 through the camera 120 while the light is irradiated by the illumination device 110 at step S110.

In step S110, the image obtained through the camera 120 is an image photographed in a state where the divergent light of the molten metal and the reflected light of the cooling roll 20 are removed by the optical filter 130. The optical filter 130 removes the divergent light of the molten metal and the reflected light of the cooling roll 20 from the light incident on the camera 120 and transmits the light in the same wavelength band (for example, 300 nm to 400 nm) is transmitted through the camera 120. The camera 120 captures an image by capturing only light transmitted through the optical filter 130.

The gap measurement system 100 acquires an image through the camera 120 and performs a binarization process on the image and then detects the lower edge of the nozzle 10 and the upper edge of the cooling roll 20 from the image ).

The gap measurement system detects the distance between the nozzle 10 and the top edge of the chill roll 20 from the distance between the lowermost edge of the nozzle 10 and the top edge of the chill roll 20 when the lower edge of the nozzle 10 and the upper edge of the chill roll 20 are detected. The gap between the rolls 20 is obtained (S130).

Typically, the degree of expansion of the nozzle in the state where the molten metal is being discharged during the casting of the strip / fiber may vary depending on the position. For example, the central portion where the openings for discharging the molten metal from the nozzles are located may have a greater degree of expansion than the opposite ends of the nozzles that are in direct contact with the molten metal and are indirectly affected by the molten metal. Therefore, in order to accurately measure the gap between the nozzle and the cooling roll, it is necessary to measure the contact surface between the nozzle having a large expansion degree and the molten metal puder, that is, the distance between the center of the nozzle and the cooling roll. However, conventionally, due to the light emitted from the molten metal, there is a difficulty in accurately detecting the shape of the center portion where the molten metal is discharged from the lower end of the nozzle during casting.

In order to solve such a problem, the gap measuring system according to the embodiment irradiates light of a wavelength band different from the divergent light of the molten metal and the reflected light of the cooling roll through the lighting device 110 through the nozzle, The optical filter 130 removes the diverging light of the molten metal and the reflected light of the cooling roll. Accordingly, the camera 120 can acquire a unique shape image of the contact surface (the lowermost end of the nozzle) contacting the molten metal puddle at the nozzle while the influence of the diverging light of the molten metal and the reflected light of the cooling roll is removed. Accordingly, it is possible to detect the contact surface between the nozzle and the molten metal puddle, that is, the lowermost edge of the nozzle, so that the gap measurement accuracy between the nozzle and the cooling roll can be improved even during casting.

Conventionally, when the camera and the light source are arranged opposite to each other, and the light source irradiates light passing through the gap between the nozzle and the cooling roll, the camera in the opposite direction captures the light-transmitting image so that the gap between the nozzle and the cooling roll The accuracy of the detection method is ensured if the alignment between the light source and the camera is based on 6 degrees of freedom (X, Y, Z, Roll, Pitch, Roll). That is, the gap measurement accuracy can be changed according to the alignment accuracy between the camera and the light source. However, it is very difficult to ensure the alignment accuracy between the light source and the camera during the installation process, and when the cooling roll is turned every time the casting roll is changed in diameter, the straightness of the light changes, do. Further, there is a problem in that during irradiation of the molten metal from the nozzle, the light irradiated from the illumination does not pass through the molten metal, so that the edge region of the central portion where the molten metal is discharged from the nozzle can not be detected.

In order to solve this problem, the gap measuring system according to the embodiment detects the gap between the nozzle and the cooling roll by detecting only the lowermost end face of the nozzle after horizontally aligning the camera 120 with the uppermost end face of the cooling roll as described above . Therefore, since only the horizontal alignment with the uppermost end face of the cooling roll 20 should be taken into consideration when positioning the camera 120, there is an advantage in that the installation is simple.

The gap measuring method according to the embodiment of the present invention can be executed through software. When executed in software, the constituent means of the present invention are code segments that perform the necessary tasks. The program or code segments may be stored on a processor read functional medium or transmitted by a computer data signal coupled with a carrier wave in a transmission medium or network.

A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the computer-readable recording device include ROM, RAM, CD-ROM, DVD-ROM, DVD-RAM, magnetic tape, floppy disk, hard disk and optical data storage device. Also, the computer-readable recording medium may be distributed over a network-connected computer device so that computer-readable code can be stored and executed in a distributed manner.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are illustrative and explanatory only and are intended to be illustrative of the invention and are not to be construed as limiting the scope of the invention as defined by the appended claims. It is not. Therefore, those skilled in the art can readily select and substitute it. Those skilled in the art will also appreciate that some of the components described herein can be omitted without degrading performance or adding components to improve performance. In addition, those skilled in the art may change the order of the method steps described herein depending on the process environment or equipment. Therefore, the scope of the present invention should be determined by the appended claims and equivalents thereof, not by the embodiments described.

110: illumination device 120: camera
130: Optical filter 140: Control device
141: edge detecting unit 142: gap measuring unit

Claims (11)

A gap measurement system between a nozzle and a cooling roll,
A camera for photographing the lower portion of the nozzle and the upper portion of the cooling roll to obtain an image,
An illumination device for irradiating the nozzle and the cooling roll with light of a specific wavelength band to an area taken by the camera,
A band-pass filter coupled to the camera and transmitting light of the specific wavelength band among the light incident on the camera to an image pickup plane of the camera,
And a control unit for detecting the lowermost edge of the nozzle from the image and measuring the gap between the nozzle and the cooling roll based on the lowermost edge of the nozzle.
The method according to claim 1,
Wherein the band-
A first filter for removing the divergent light of the molten metal discharged from the nozzle by the light incident on the camera,
And a second filter for removing reflected light from the cooling roll.
3. The method of claim 2,
Wherein the specific wavelength band is different from the wavelength band of the divergent light of the molten metal and the reflected light of the cooling roll.
The method according to claim 1,
Wherein the specific wavelength band is a wavelength band of 300 nm to 400 nm.
The method according to claim 1,
Wherein the band-
And is coupled to an incident surface of a lens portion of the camera.
The method according to claim 1,
Wherein the band-pass filter is disposed between the lens portion of the camera and the imaging surface.
The method according to claim 1,
Wherein the illumination device irradiates light in the same direction as the photographing direction of the camera.
The method according to claim 1,
Wherein the camera is installed such that the optical axis is horizontally aligned with the top surface of the cooling roll.
A method for measuring a gap between a nozzle and a cooling roll of a gap measuring system,
Irradiating light of a specific wavelength band to a lower portion of the nozzle and an upper portion of the cooling roll through a lighting device,
Obtaining an image of a region irradiated with light of the specific wavelength band in the nozzle and the cooling roll through a camera having a band-pass filter that transmits light of the specific wavelength band among incident light,
Detecting a bottom edge of the nozzle from the image, and
And measuring a gap between the nozzle and the cooling roll based on the lowermost edge of the nozzle.
10. The method of claim 9,
Wherein the specific wavelength band is different from the wavelength band of the divergent light of the molten metal discharged by the nozzle and the reflected light of the cooling roll.
11. The method of claim 10,
Wherein the specific wavelength band is a wavelength band of 300 nm to 400 nm.
KR1020150182239A 2015-12-18 2015-12-18 System and method for measuring gap between nozzle and cooling roll KR20170073384A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022020717A1 (en) * 2020-07-23 2022-01-27 Novelis Inc. Detecting metal separation from casting mold

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022020717A1 (en) * 2020-07-23 2022-01-27 Novelis Inc. Detecting metal separation from casting mold

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