JP2002248548A - Method and equipment for manufacturing thin metal strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and equipment for manufacturing a thin metal strip wherein the dimension of a gap between a nozzle and a cooling roll can be exactly measured during pouring molten metal in manufacturing a thin metal strip and a thin metal strip of which the lengthwise thickness is uniform can be manufactured. SOLUTION: A tundish 11 and a cooling roll 15 are set so that the lateral end face of the nozzle 12 of the tundish 11 and the lateral end face of the cooling roll 15 may be within the same plane. The gap 17 is pictured in a large magnification by a CCD (charge coupled device) picturing apparatus 18 with an infrared-transparent filter 19. 1400 deg.C molten metal is held in the tundish 11 and the nozzle 12 becomes incandescent. The shortwave length part is cut away from light emitted from the nozzle 12. The lateral end face of the nozzle 12 and the lateral end face of the cooling roll which does not exceed 200 deg.C are clearly pictured owing to an adequate contrast ratio. The dimension of the gap 17 is exactly measured by this image processing so that the thin metal strip with a lengthwise uniform thickness is manufactured stably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a metal ribbon, and more particularly, to pouring a molten metal from a nozzle of a tundish or crucible onto the surface of a cooling roll to form the metal ribbon. The present invention relates to a manufacturing method and a manufacturing apparatus for obtaining a metal ribbon having a uniform thickness in a length direction during manufacturing.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view of an apparatus 100 for producing a continuous strip of metal as exemplified in Japanese Patent Publication No. 59-42886, which includes a reservoir 108 having an induction heating coil 109 for holding molten metal. And a cooling roll 107. The reservoir 108 is connected to a slotted nozzle 110, which is mounted very close to the surface of the cooling roll 107. As shown in FIG. 6, the nozzle 110 and the cooling roll 107 have the same width at the near end, and the respective side end surfaces at the near end are in the same plane perpendicular to the rotation axis 106 of the cooling roll 107. . Further, the reservoir 108 is provided with a means (not shown) for applying pressure to the molten metal and discharging the molten metal from the nozzle 110. Then, the molten metal in the reservoir 108 held under pressure is discharged to the surface of the rotating cooling roll 107 through the nozzle 110, and is immediately solidified to form the strip 111.

[0003] In the production example 1, the nozzle 110
Is provided with a slot 0.9 mm wide and 51 mm long,
The distance between the nozzle 110 and the cooling roll 107 is 0.05 mm behind the slot and 0.0 mm before the slot.
6 mm. The cooling roll 107 has a size of 5 inches in width and 16 inches in diameter, and a roller rotating at a speed of about 700 rpm is used.
g of molten metal from the slot under a pressure of
By extruding and cooling to a thickness of 0.05 mm,
A strip 111 having a width of 5 cm is manufactured.

In such a manufacturing apparatus, the thickness of the metal ribbon to be manufactured depends on the amount of molten metal poured from the nozzle per unit time, the number of rotations of the cooling roll, and the gap between the lower end of the nozzle and the cooling surface of the cooling roll. Is determined by Of these, it is relatively easy to maintain the amount of pouring from the nozzle and the number of revolutions of the chill roll by control, but the reservoir and the nozzle thermally expand due to the supply of molten metal, and the chill roll starts pouring. Therefore, it is not easy to keep the gap size constant. That is, in order to manufacture a metal ribbon having a uniform thickness in the length direction, it is extremely important to keep the dimension of the gap constant. Note that the above example includes the nozzle 11
No description is given on the measurement of the gap dimension between the cooling roll 107 and the zero.

Japanese Patent Application Laid-Open No. 57-80508 proposes a measuring method for irradiating a gap with a light beam and scanning the gap to measure the size of the gap based on a temporal change in the intensity of light passing through the gap. Have been. Japanese Patent Application Laid-Open No. 58-132356 discloses a television camera capable of enlarging and photographing a moving surface of a cooling roll of a cooling roll in order to measure a dimension of a gap between a nozzle and a cooling roll during the production of a metal ribbon. There has been proposed a method of manufacturing a metal ribbon which is photographed from a direction and a direction perpendicular to the direction. In addition, the actual opening 61-16
In Japanese Patent No. 7246, notches are provided at both side edges of a lower end portion of a nozzle to partially widen a gap between a nozzle and a cooling roll, and a projector and a receiver are provided on both the upstream side and the downstream side with these notches interposed therebetween. And an apparatus for manufacturing a metal ribbon capable of measuring the gap between both the cut portions and the cooling roll.

Further, Japanese Patent Application Laid-Open No. Hei 9-192794 discloses that a side end face of a nozzle and a side end face of a cooling roll are arranged on the same plane, and a dimension of the gap is obtained from an image of a gap between the side end faces. A method has been proposed, and in addition, a method of providing a reference length display means at the lower end of the nozzle has been proposed. Furthermore, for large gaps,
A groove that penetrates in the running direction of the cooling surface of the cooling roll and opens to the cooling surface is provided in an outer portion of the side end of the slot of the nozzle, and the light beam is scanned toward the groove to scan the light beam passing therethrough. There has been proposed a method of obtaining a gap size from a temporal intensity change. Japanese Patent Application Laid-Open No. 10-5937 discloses that the method of arranging the side end surface of the nozzle and the side end surface of the cooling roll in the same plane has a large difference in brightness between the nozzle heated by the molten metal and the cooling roll not heated. Because the contrast is too large, it is difficult to accurately measure the gap size from the captured image, so the nozzle side end face is arranged at an angle to the cooling roll side end face, and facing the junction of both side end faces. There is disclosed a method of irradiating light from the side and imaging reflected light from an angle at which specularly reflected light from the side end surface of the nozzle is not received to determine the dimension of the gap.

[0007]

[Problems to be solved by the invention] Japanese Patent Publication No. 59-4258
6, the width of the nozzle 110 and the width of the cooling roll 107 are the same at the near end, and the side end surface of the nozzle and the side end surface of the cooling roll are arranged in the same plane. Japanese Patent Application Laid-Open No. 58-13 / 1983 discloses a method of measuring the size of a small gap between a nozzle and a cooling roll by measuring the size of the gap.
This is performed in Japanese Patent No. 2356. The method of measuring the temporal change in the intensity of light passing through a gap by scanning a light beam causes an error in the measurement of a small gap and is suitable for the measurement of a large gap.
It is described in 1-167246.

[0008] Even when imaging the side end surface of the nozzle where the temperature is high and the incandescent lamp is heated and the side end surface of the cooling roll where the temperature is low, the brightness is so large that a clear image of both end surfaces cannot be obtained. In the publication, a method is provided in which a predetermined angle is provided between the side end surface of the nozzle and the side end surface of the cooling roll. However, the nozzle is raised with respect to a fixed cooling roll as a reference, and is lowered with the pouring of the molten metal, so that the inclination angle between the side end face of the nozzle and the side end face of the cooling roll sometimes causes a “shift”. Occur. Even if it is a slight “shift”, if “shift” occurs,
The preferable light projecting position and the appropriate light receiving position of the reflected light greatly vary, and each time the light projecting position and the light receiving position need to be adjusted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is possible to accurately and easily measure a dimension of a gap between a nozzle and a cooling roll at the time of pouring, and to obtain a metal ribbon having a uniform thickness in a length direction. It is an object of the present invention to provide a manufacturing method and a manufacturing apparatus capable of stably manufacturing the same. More specifically, even if there is a large contrast between the brightness of the incandescent high-temperature nozzle and the low-temperature cooling roll, the production of a metal ribbon capable of easily measuring the size of the gap by imaging both end faces. It is an object to provide a method and a manufacturing apparatus.

[0010]

Means for Solving the Problems The above-mentioned problems can be solved by the structure of claim 1 or claim 4. The means for solving the problems is as follows.

According to a first aspect of the present invention, there is provided a method for pouring a molten metal from a nozzle of a tundish or crucible to a surface of a cooling roll rotating at a high speed through a gap in a vacuum or an inert gas atmosphere. In the method of manufacturing a metal ribbon for forming a metal ribbon by quenching, at least one of a combination of a side end surface of a nozzle and a side end surface of a cooling roll facing each other on both sides of the nozzle is combined with a cooling roll. Arranged in the same plane perpendicular to the rotation axis, image the gap in the combination of the side end faces through a bandpass filter that cuts short wavelength components contained in the emitted light from the hot nozzle, and image-process the resulting image This is a manufacturing method for determining and adjusting the size of the gap.

According to such a method of manufacturing a metal ribbon, a short-wavelength component contained in radiation emitted from a nozzle of a tundish or a crucible, which is heated to a temperature of 1000 ° C. or more by the contained molten metal and becomes incandescent, is cut by a bandpass filter and imaged. The gap between the nozzle side end face and the cooling roll side end face can be clarified by adjusting the sensitivity, avoiding troubles such as the side end face of the cooling roll becoming too dark. An image can be taken, and the image can be subjected to image processing to accurately determine the size of the gap. Therefore, the gap size is adjusted to a predetermined value,
A metal ribbon having a uniform thickness in the length direction can be continuously manufactured.

[0013] The method for producing a metal ribbon according to the second aspect is a method for illuminating the side end face of the cooling roll with infrared rays. Such a method of manufacturing a metal ribbon reduces the contrast ratio between the side end surface of the nozzle and the side end surface of the cooling roll, and facilitates measurement of the gap size based on a captured image.

The method for manufacturing a metal ribbon according to the third aspect is a method for manufacturing an image of a gap using an infrared transmission filter as a bandpass filter and using a CCD imaging device or a silicon vidicon imaging device. Such a method of manufacturing a metal ribbon cuts a visible light ray out of light emitted from a nozzle, and converts a near-infrared ray component having a wavelength of 0.8 μm to 1.1 μm among transmitted infrared rays into a CCD.
Since the image is taken by the imaging device or the silicon vidicon imaging device, the gap at the side end face can be clearly taken.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a metal ribbon, wherein an infrared transmission filter is used as a bandpass filter, and a gap is imaged by an infrared imaging apparatus. In such a method for manufacturing a metal ribbon, since the gap between the both end faces is imaged only by the infrared component of the light emitted from the nozzle, an image with an appropriate contrast can be obtained, and the gap dimension can be accurately obtained. .

According to a fifth aspect of the present invention, there is provided an apparatus for manufacturing a metal ribbon, wherein molten metal is poured from a nozzle of a tundish or crucible to a surface of a cooling roll rotating at a high speed through a gap in a vacuum or an inert gas atmosphere. In a manufacturing apparatus for a metal ribbon that forms a metal ribbon by quenching, a combination of a side end surface of a nozzle and a side end surface of a cooling roll opposed to each other on both sides of the nozzle, the same being perpendicular to the rotation axis of the cooling roll. At least one combination arranged in a plane, a bandpass filter that cuts short wavelength components included in the emitted light from the high-temperature nozzle, and an imaging device that images a gap in the combination of the side end faces through the bandpass filter, This is a manufacturing apparatus including an image processing device for obtaining a gap size from an image screen and an adjustment mechanism for adjusting the gap size.

Such a thin metal ribbon manufacturing apparatus cuts a short-wavelength component contained in radiation emitted from a nozzle of a tundish or crucible which is heated to 1000 ° C. or more by a molten metal contained therein by a bandpass filter, Since the gap between the side end face of the nozzle and the side end face of the cooling roll is imaged, it is possible to avoid troubles such as halation of the nozzle or the darkness of the cooling roll by adjusting the sensitivity, and avoid gaps on the side end face. Can be clearly imaged, and the image can be image-processed to accurately determine and adjust the size of the gap. Therefore, it is possible to continuously manufacture a metal ribbon having a uniform thickness in the length direction by setting the gap dimension to a predetermined value.

According to a fifth aspect of the present invention, there is provided the apparatus for manufacturing a metal ribbon according to the sixth aspect, wherein the apparatus is provided with an illumination source by infrared rays for illuminating a side end face of the cooling roll. Such a thin metal ribbon manufacturing apparatus illuminates the side end surface of the cooling roll with infrared rays when imaging the gap, thereby reducing the contrast ratio between the side end surface of the nozzle and the side end surface of the cooling roll, thereby reducing the gap caused by the imaging screen. Facilitates dimensional measurements.

The metal ribbon manufacturing apparatus according to claim 7 is a manufacturing apparatus in which the bandpass filter is an infrared transmission filter and the imaging device is a CCD imaging device or a silicon vidicon imaging device. Such a thin metal ribbon manufacturing apparatus cuts visible light of radiation emitted from a nozzle, and converts a near infrared component having a wavelength of 0.8 μm to 1.1 μm of transmitted infrared light into a CCD image pickup device or a silicon image pickup device. Since the image is captured by the vidicon imaging device, the gap between both end surfaces can be clearly captured.

According to a fifth aspect of the present invention, there is provided the apparatus for manufacturing a metal ribbon, wherein the bandpass filter is an infrared transmission filter and the imaging device is an infrared imaging device. Such an apparatus for manufacturing a metal ribbon can image the gap between the both end faces only by the infrared component of the light emitted from the nozzle, so that an image with an appropriate contrast can be obtained and the gap dimension can be accurately obtained. be able to.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, a method and an apparatus for manufacturing a metal ribbon according to the present invention provide a method for manufacturing a metal melt from a tundish or crucible nozzle through a gap in a vacuum or inert gas atmosphere. When pouring onto the surface of a high-speed rotating cooling roll and quenching it to form a metal ribbon,
At least one of the combinations of the side end surface of the nozzle and the side end surface of the cooling roll facing each other on both sides of the nozzle is arranged in the same plane perpendicular to the rotation axis of the cooling roll, and The gap of the combination of the side end faces is imaged through a bandpass filter that cuts a short wavelength component of the emitted light, and the obtained image is subjected to image processing to determine and adjust the dimension of the gap.

In manufacturing a metal ribbon, as described above, the size of the gap between the lower end of the nozzle and the outer peripheral surface of the cooling roll determines the thickness of the metal ribbon to be manufactured. Therefore, the size of the gap is at least when the tundish or crucible and the nozzle are installed at room temperature.
Cooling roll after the start of pouring, when the nozzle is lowered and the gap is narrowed, during preheating of the nozzle where the tundish or crucible is filled with the molten metal and the nozzle is preheated so that the nozzle is not clogged Measured during thermal expansion of
It is necessary to adjust the size of the gap to a predetermined value. Of these, when the nozzle is at the ascending position and the gap size is, for example, 2 mm or more, high-precision measurement of the gap size is not required, but the nozzle is lowered and the gap size is, for example, 0.2 to 0.5 mm. Is done. When pouring, high-precision measurement in units of 0.01 mm is required.

However, at this time, as described above, the molten metal is at a temperature of 1000 ° C. or higher, and the nozzle becomes incandescent. Since the contrast of the brightness is extremely large, even if the gap between the nozzle side end face and the cooling roll side end face is imaged, a clear image that can measure the gap dimension between both end faces with high accuracy is obtained. I can't.
As shown by the Wien's displacement law, the wavelength of emitted light at which the radiant energy density is maximized is inversely proportional to the absolute temperature.
Therefore, in the present invention, the gap is imaged through a bandpass filter that cuts short wavelength components contained in the radiation light from the high-temperature nozzle, and the resulting image having a small contrast ratio is image-processed to accurately and easily determine the gap size. It is what we asked for. With respect to the decrease in the amount of light due to the use of the bandpass filter, it may be necessary to adjust the shutter speed and the gain as compared with the case of ordinary imaging using visible light.

For image processing of the obtained image, a generally employed method can be used as it is. For example, when using a silicon CCD imaging device to increase the imaging magnification and capture an image of the nozzle-side end face and the cooling roll-side end face together with the gap, a 400-pixel CCD in the vertical direction captures an actual gap of 0.4 mm in the vertical direction. In the case where the image is fully displayed, the image is picked up with a resolution of 1 μm per vertical pixel, so that the obtained image can be image-processed and the precision control of the gap size in units of 0.01 mm is sufficiently possible. However, in this case, since the imaging magnification is increased, it is needless to say that the side end face of the nozzle and the side end face of the cooling roll need to be in the same plane. Since it is not possible to obtain a clear gap image because one of them is blurred, it is difficult to obtain an accurate gap size from the image.

Further, at the time of imaging, the imaging portion on the side end surface of the cooling roll is illuminated with infrared rays to reduce the contrast ratio between the side end surface of the nozzle and the side end surface of the cooling roll, thereby reducing the gap size of the imaged image. Measurement can be facilitated. A preferable contrast ratio between the side end surface of the nozzle and the side end surface of the cooling roll is 50/1 to 20/1.
Within the range. It is desirable to use near infrared rays having a wavelength of up to 2 μm as infrared rays for illumination. This is to avoid unnecessary heating of the cooling roll by the illumination. If the temperature rise of the cooling roll due to the illumination is not substantially recognized, the illumination light contains infrared rays having a wavelength of 2 μm or more. You may. Of course, visible light may be included. Most conveniently, an infrared lamp can be used as a near-infrared illumination source.

As the bandpass filter, an infrared transmission visible light cut filter that cuts visible light and transmits infrared light is used, and a CCD image pickup device or a silicon vidicon image pickup device can be combined with the filter. FIG. 3 is a diagram showing the relationship between wavelength and transmittance for an example of a commercially available infrared transmitting visible light cut filter. Visible light having a wavelength of 0.8 μm or less is completely cut, and transmits mainly infrared light having a wavelength of 0.8 μm to 2 μm and infrared light having a wavelength of 5 μm. On the other hand, FIG.
FIG. 3 is a diagram showing a relationship between wavelength and sensitivity of a silicon vidicon normally used for imaging in a visible light region. Commercially available silicon vidicon has sensitivity to near infrared rays having wavelengths of 0.8 μm to 1.1 μm in addition to visible light. CC
The D imaging device also has the same sensitivity as the silicon vidicon imaging device. Therefore, for the emitted light from the incandescent nozzle, the infrared transmitting visible light cut filter as described above is used, and the wavelength of the transmitted infrared light is 1.1 μm.
By imaging the near-infrared light up to the CCD imaging device or silicon vidicon imaging device, an image having a small contrast ratio between the side end surface of the nozzle and the side end surface of the cooling roll can be obtained, and the gap size can be measured with high accuracy. .

That is, when the gap between the side end face of the tundish and the side end face of the cooling roll is imaged when the tundish is poured from the tundish to the cooling roll, the amount of light on both end faces is adjusted as described above. By adjusting the contrast in, the gap size can be accurately obtained. Of course, by using an infrared transmission filter, for example, a band-pass filter that transmits infrared light having a wavelength of 0.8 μm or more, or a window material such as silicon (Si) that transmits infrared light having a wavelength of 1 μm or more, May be transmitted by a solid-state imaging device made of InAs (indium arsenide), InSb (indium antimony), or HgCdTe (mercury cadmium tellurium) and having sensitivity to infrared light.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a method and an apparatus for manufacturing a metal ribbon according to the present invention will be described in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a perspective view showing an arrangement of element devices in a vacuum chamber, in which a metal ribbon manufacturing apparatus is not shown. In other words, the induction heating coil 13 is wound, and the tundish 11 and the nozzle 12 in which the metal melt 10 is accommodated are rotated at high speed in the direction of the arrow around the rotation shaft 16 immediately below the tundish 11 and poured from the nozzle 12. Rolls 15 for rapidly cooling the molten metal 10 to form thin metal strips 14, these nozzles 12 and the cooling roll 15 are arranged on the side end surface side to image a gap 17 between the lower end of the nozzle 12 and the outer peripheral surface of the cooling roll 15. And a CCD imaging device 18. FIG. 2 is a partial longitudinal sectional view of a vertical plane including a line in the imaging direction of the CCD imaging device 18 of FIG.

The tundish 11 and the nozzle 12 are integrally formed of boron nitride, and are in the raised position when the molten metal is supplied and the nozzle 12 is prepared to be preheated.
At the time of pouring, it is brought close to the cooling roll 15 and is set to the lowered position shown in FIG. Although not shown, the tundish 11 has a closed structure at the top, and the tundish 1
By pressurizing inside 1 with an inert gas, the contained molten metal 10 is poured from nozzle 12 to the outer peripheral surface of cooling roll 15. At the lower end of the nozzle 12, a slot having a long side of 50 mm and a short side of 0.4 mm is provided in the direction perpendicular to the running direction of the surface of the cooling roll 15. Is poured onto the surface of The cooling roll 15 has a diameter of 40
A water-cooled roll having a copper cooling surface with a diameter of 0 mm
It is rotated at a high speed of 00 rpm in the direction indicated by the arrow.

The silicon CCD image pickup device 18 is installed such that the image pickup surface is located 800 mm apart from the side end surface of the nozzle 12. The CCD has 400 pixels in the vertical direction and 400 pixels in the horizontal direction, and a commercially available infrared transmitting visible light cut filter (trade name: IR-D1B, Toshiba) having the transmission characteristics shown in FIG.
19 are mounted. The formed metal ribbon 14
Nozzle 12 together with tundish 11 according to the thickness of
The height position is adjusted, and the adjustment can be adjusted independently on both right and left ends, but the adjustment mechanism is not shown.

An image processing section (not shown) is connected to the silicon CCD image pickup device 18. Image processing unit is CC
In addition to displaying the measured value of the dimension of the gap 17 from the image obtained by the D imaging device 18, a control circuit is incorporated, and when there is a “shift” between the set value of the dimension of the gap 17 and the measured value, Transmits a pulse signal according to the magnitude of the "shift", and the servomotor operated by the signal raises and lowers the height position of the tundish 11,
A function of returning the dimension of the gap 17 to a set value is provided.
By the way, the height position of the tundish 11 is 0.01 to
It is moved up and down at a very small speed of 0.02 mm / sec. Furthermore, when the metal ribbon 14 starts to be manufactured continuously, an actual measured value of the thickness is input from an inspection device that measures the thickness of the manufactured metal ribbon 14 in-line, and the measured value of the thickness is compared with the set value of the thickness. A pulse signal corresponding to the difference is transmitted, and the height position of the tundish 11 can be adjusted with an accuracy of 0.01 mm.

That is, at the ascending position, the molten metal 10 of the Sm-Fe amorphous alloy at 1400 ° C. is supplied into the tundish 11, the temperature of the molten metal 10 is maintained by the induction heating coil 13, and the nozzle 12 Are preheated to prevent clogging. Then, when the preparation for pouring is completed, the lowering position shown in FIG. 1 is set. That is, the cooling roll 15
The tundish 11 and its nozzle 12 are lowered so that a gap 17 of 0.5 mm is formed between the tundish 11 and the cooling surface of the nozzle 12, and as shown in FIGS. And the side end surface of the cooling roll 15 are arranged in the same plane. And nozzle 1
2 and silicon C arranged on both sides of cooling roll 15
By the CD imaging device 18, the side end surface of the nozzle 12 and the side end surface of the cooling roll 15 are imaged together with the gap 17.

That is, the brightness of the nozzle 12 is adjusted such that the short wavelength visible light is cut by the infrared transmitting visible light cut filter 19 and the wavelength of the transmitted infrared light is 0.8 μm.
Near infrared components of m to 1.1 μm are imaged. By adjusting the gain of the CCD imaging device 18, the nozzle 12
And a clear image of the side end surface of the cooling roll 15 can be obtained, and the image can be processed by the image processing section to accurately determine the size of the gap 17. Then, the height position of the tundish 11 and its nozzle 12 is finely adjusted according to the size of the obtained gap 17, and the gap 17 is accurately positioned at a position where the size of the gap 17 becomes a predetermined 0.5 mm.

When the positioning is completed, the tundish 1
1 is pressurized with argon gas, and the surface of the cooling roll 15 which rotates the melt 10 at high speed from the slot of the nozzle 12 so that the sum of the pressure of the argon gas and the head of the melt 10 maintains a constant 5 kPa. 14.1 per unit time
The mixture is poured at a rate of kg / min and rapidly solidified. Then, when the pouring is started, the cooling roll 15 rises in temperature and thermally expands.
m becomes slightly shorter. Therefore, the set value of the gap size set in the image processing unit of the CCD image pickup device 18 is 0.5 m.
The servomotor is driven by a pulse signal output according to the difference between m and the measured value to adjust the height position of the tundish 11 to return the gap size to the set value of 0.5 mm. Further, the thickness of the obtained ribbon 14 is inspected in-line, and the result is fed back to the image processing unit to further fine-tune the size of the gap 17 and the production is continued. In this way, a thin ribbon 14 of an Sm—Fe alloy having a uniform thickness in the length direction, a smooth surface of 10 μm, and a width of 50 mm was obtained as a long ribbon.

(Embodiment 2) When an appropriate contrast ratio cannot be obtained depending on the type of band filter used, the side end surface of the cooling roll 15 may be illuminated with near infrared rays. That is, referring to FIGS. 1 and 2 of the first embodiment,
By using a bandpass filter different from the infrared transmission visible light cut filter 19 of the first embodiment, if the contrast ratio between the side end surface of the nozzle 12 and the side end surface of the cooling roll 15 due to the transmitted light is still large, On both sides of the cooling roll 15, an infrared lamp with a narrowed beam is provided so as to illuminate an imaging portion on a side end face of the cooling roll 15. Otherwise, the apparatus for manufacturing a metal ribbon is completely the same as that of the first embodiment.

Then, 1400 is placed in the tundish 11.
When the molten metal 10 of the cooling roll 15 is stored and the brightness of the side end surface of the nozzle 12 becomes large, the imaging part of the side end surface of the cooling roll 15 is illuminated by an infrared lamp, and the side end surface of the nozzle 12 and the side end surface of the cooling roll 15 By adjusting the illumination so that the contrast ratio becomes about 50/1, the side end surface of the nozzle 12 and the side end surface of the cooling roll 15 are imaged together with the gap 17 as a clear image, and the dimension of the gap 17 is reduced. Measured accurately.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical concept of the present invention.

For example, in the first embodiment, the case where the side end face of the nozzle 12 and the side end face of the cooling roll 15 are imaged from both sides has been described. Of course, the gap size may be obtained by imaging only one side. . In the first embodiment,
The case where the CCD image pickup device 18 is installed in a vacuum system has been described. However, the side end surface of the nozzle 12, the side end surface of the cooling roll 15, and the gap 17 thereof are imaged through an observation window provided on the atmosphere side and provided on the wall of the vacuum chamber. You may make it.

In the first embodiment, when the nozzle 12 is at the lowered position, the side end face of the nozzle 12 is
Although the method of measuring the gap dimension by imaging the side end face of the nozzle 5 together with the gap 17 has been described, the vertical or horizontal direction is provided on the side end face of the nozzle 12 which can be imaged simultaneously with the imaging of the gap 17. A reference length portion or a reference length portion in an arbitrary direction such as a circle may be provided. Based on the number of pixels corresponding to the reference length portion, the gap size obtained by imaging can be calibrated. In the first embodiment, the width of the nozzle 12 and the width of the cooling roll 15 are the same. However, the outermost peripheral portion of the cooling roll 15 related to the imaging of the gap 17 has the same width as the nozzle 12, and the inner circumferential side thereof. Then, the width may be enlarged.

In the present embodiment, the gap dimension between the nozzle-side end face and the cooling roll-side end face when the nozzle is at the lowered position is measured with high accuracy, and the thickness of the metal sheet having a uniform thickness in the longitudinal direction is measured. A production method and a production apparatus capable of producing a belt have been described, but at room temperature immediately after the installation of the tundish and the nozzle, the molten metal is supplied to the tundish, and the tundish and the nozzle are heated by induction heating and before the pouring. When the tip of the nozzle is 2mm to 50mm from the cooling roll surface
When in the remote elevated position, the gap dimension at the elevated position must be measured to set the distance to lower the tundish and nozzle. Although the measurement of the gap size at such an ascending position is possible by reducing the imaging magnification of the silicon CCD imaging device 18, the gap size may be too large to be measured.

In such a case, Japanese Utility Model Laid-Open Publication No.
No. 246, the projector and the light receiver are arranged upstream and downstream with a gap between the nozzle at the ascending position, the lower cooling roll, and the gap, The dimensions may be determined optically. FIG. 5 is a schematic diagram showing the measurement system. A laser beam 20 oscillated from a laser oscillator 21 as a light projector is periodically reflected by a rotating polygon mirror 22 so as to be vertically moved, that is, a nozzle 12 and a cooling roll. 15 in the dimensional direction of the gap 17 ′,
In this method, the laser beam 20 'passing through the gap 17' is detected by a photodiode 23 as a light receiver. In addition, in order to improve the S / N ratio, a bandpass filter 24 that transmits only the laser light 20 ′ is attached to the front surface of the photodiode 23. The size of the gap 17 'is measured from the temporal change of the intensity of the detected laser beam 20', in other words, from the time at which the laser beam 20 'is detected.

[0043]

The method and apparatus for manufacturing a metal ribbon according to the present invention are implemented in the form described above, and have the following effects.

According to the method for manufacturing a metal ribbon of the first aspect,
When the contrast ratio between the side end surface of the nozzle which becomes incandescent at a temperature of 1000 ° C. or more and the side end surface of the cooling roll which does not exceed the temperature of 200 ° C. is excessively large, the short wavelength component of the radiation light from the nozzle is reduced. Since the image is cut with a bandpass filter and the contrast ratio is reduced, the gap between the lower end of the nozzle that controls the thickness of the metal ribbon and the surface of the cooling roll can be clearly imaged. The length of the metal strip can be stably manufactured in the length direction by adjusting the thickness of the metal strip with high accuracy.

According to the method for manufacturing a metal ribbon of claim 2,
Since the side edge of the cooling roll, whose brightness is smaller than that of the side edge of the nozzle, is illuminated with infrared rays, the side edge of the nozzle and the side edge of the cooling roll can be imaged with an appropriate contrast ratio. Can be accurately measured. According to the method for manufacturing a metal ribbon according to the third aspect, an infrared transmission filter is used as a bandpass filter, and an image is taken by a general CCD image pickup device or a silicon vidicon image pickup device. The dimension of the gap with the end face can be imaged at a relatively low cost and accurately measured. According to the method for manufacturing a metal ribbon according to claim 4, since the side end surface of the nozzle and the side end surface of the cooling roll are imaged by the infrared imaging device using the infrared transmission filter, the short wavelength component of the radiation light from the nozzle is reduced. It is possible to sufficiently capture the infrared ray emitted from the side end surface of the cooling roll after cutting, and to take an image, so that the nozzle side end surface, the cooling roll side end surface, and the gap can be clearly imaged.

According to the apparatus for manufacturing a metal ribbon of claim 5,
When imaging the side end surface of the nozzle that becomes incandescent at a temperature of 1000 ° C. or more and the side end surface of the cooling roll that does not exceed the temperature of 200 ° C., a short-wavelength component of light emitted from the nozzle is cut by a bandpass filter. Since the imaging can be performed with a reduced contrast ratio, a clear image of the gap between the lower end of the nozzle, which governs the thickness of the metal ribbon, and the surface of the cooling roll is obtained, thereby accurately measuring the gap dimensions. By measuring and adjusting with high accuracy, it is possible to stably produce a metal ribbon having a uniform thickness in the length direction.

According to the apparatus for manufacturing a metal ribbon of claim 6,
Since there is an illumination source by infrared rays for illuminating the side end surface of the cooling roll, which has a smaller brightness than the side end surface of the nozzle, the side end surface of the nozzle and the side end surface of the cooling roll have an appropriate contrast ratio. The dimensions of the gap can be accurately measured by imaging. According to the apparatus for manufacturing a metal ribbon according to claim 7, an infrared transmission filter is provided as a bandpass filter, and a general CCD imaging device or a silicon vidicon imaging device is provided as an imaging device. Can be imaged at a relatively low cost and can be accurately measured. Claim 8
According to the apparatus for manufacturing a thin metal ribbon of the above, an infrared transmission filter is provided as a bandpass filter and an infrared imaging apparatus is provided as an imaging apparatus, so that short-wavelength components of light emitted from a nozzle are cut and emitted from a cooling roll. An image can be captured by sufficiently capturing infrared rays, and the side end surface of the nozzle, the side end surface of the cooling roll, and the gap can be clearly imaged.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an arrangement of a silicon CCD imaging device for imaging a tundish, a nozzle, a cooling roll, and a gap between a nozzle and a cooling roll when a nozzle is at a lowered position in a metal ribbon manufacturing apparatus. FIG.

FIG. 2 is a partial longitudinal sectional view of a vertical section including a line in an imaging direction in FIG. 1;

FIG. 3 is a diagram illustrating a relationship between wavelength and transmittance of an example of an infrared transmission visible light transmission filter.

FIG. 4 is a diagram illustrating a relationship between wavelength and sensitivity of a silicon vidicon.

FIG. 5 is a layout view of a device for measuring a gap size between a nozzle and a cooling roll when the nozzle is at a raised position in the metal ribbon manufacturing apparatus.

FIG. 6 is a perspective view showing the arrangement of a molten metal reservoir, a nozzle, and a cooling roll in a conventional metal ribbon manufacturing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Tundish 12 Nozzle 14 Metal ribbon 15 Cooling roll 17 Gap 18 CCD imaging device 19 Infrared transmission filter

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F065 AA21 AA24 BB18 CC06 DD04 DD09 DD12 FF01 FF04 JJ03 JJ05 JJ09 JJ19 JJ26 LL15 LL22 LL62 MM16 UU02 4E004 DB02 TB04 TB05 TB07 TB09

Claims (8)

[Claims] 1. A metal in which a molten metal is poured from a nozzle of a tundish or crucible to a surface of a cooling roll rotating at a high speed through a gap in a vacuum or an inert gas atmosphere and rapidly cooled to form a metal ribbon. In the method for manufacturing a ribbon, at least one of a combination of a side end face of the nozzle and a side end face of the cooling roll that are opposed to each other on both sides of the nozzle is the same perpendicular to a rotation axis of the cooling roll. Arranged in a plane, through a bandpass filter that cuts short wavelength components contained in the emitted light from the high-temperature nozzle, image the gap in the combination of the side end faces, image processing the resulting image, the gap A method for producing a metal ribbon, comprising determining and adjusting the dimensions of a metal ribbon. 2. The method according to claim 1, wherein the side end surface of the cooling roll is illuminated with infrared rays. 3. The method of manufacturing a metal ribbon according to claim 1, wherein an infrared transmission filter is used as the bandpass filter, and the gap is imaged by a CCD (Charge Coupled Device) imager or a silicon vidicon imager. Method. 4. The method according to claim 1, wherein an infrared transmission filter is used as the bandpass filter, and the gap is imaged by an infrared imaging device. 5. A metal for pouring a molten metal from a nozzle of a tundish or crucible to a surface of a cooling roll rotating at high speed through a gap in a vacuum or an inert gas atmosphere and rapidly cooling to form a metal ribbon. In the apparatus for manufacturing a ribbon, of a combination of a side end face of the nozzle and a side end face of the cooling roll facing each other on both sides of the nozzle, the combination is arranged in the same plane perpendicular to the rotation axis of the cooling roll. At least one combination, a bandpass filter that cuts short wavelength components contained in high-temperature radiation from the nozzle, an imaging device that images the gap in the combination of the side end faces through the bandpass filter, and an imaging screen An image processing apparatus for obtaining the gap dimension from the above, and an adjustment mechanism for adjusting the gap dimension, wherein the metal ribbon is provided. Manufacturing equipment. 6. The apparatus according to claim 5, further comprising an infrared light source for illuminating a side end surface of the cooling roll. 7. The apparatus according to claim 5, wherein the bandpass filter is an infrared transmission filter, and the imaging device is a CCD imaging device or a silicon vidicon imaging device. 8. The apparatus according to claim 5, wherein the bandpass filter is an infrared transmission filter, and the imaging device is an infrared imaging device.