JPH03234337A - Apparatus and method for producing rapidly cooled metal strip - Google Patents

Abstract

PURPOSE:To continuously produce an amorphous metal film having stable surface characteristic by measuring surface roughness of a cooling roll in on-line and grinding or polishing the surface of cooling roll based on this result at the time of producing the amorphous metal film by injecting molten on the cooling roll rotating at high velocity. CONSTITUTION:The inner part water cooled type copper alloy-made cooling roll 2 is rapidly rotated to the arrow mark direction, and the molten metal in a tundish 9 is injected on the surface of cooling roll 2 from a pouring nozzle 1 and super-rapidly cooled to make the amorphous metal film 3, and the metal film 3 is cooled with plate-like gas stream injected from a gas knife 4 and detached from the roll 2. In this case, laser beam 25, etc., is projected to exposed part of cooling roll surface from a projector 21, and the reflected beam 26 is received with a beam receiving part 22 and ratio of the area, where inclination angle of the surface profile detected from surface reflected light intensity of the cooling roll 2 becomes zero degree, is calculated with an arithmetic device 23, and this result is inputted to an output device 24 and pushing rates of a brush roll 5 and a buff roll 6 are adjusted to grind the surface of cooling roll 2 to the constant condition, and the surface of the obtd. amorphous metal film is always smoothened.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method and apparatus for producing a quenched metal ribbon, and relates to a quenched metal ribbon such as an amorphous metal ribbon that is continuously manufactured by a liquid quenching method. This article relates to improvements made to maintain stable surface properties of the strip at all times.

[Prior art] In recent years, progress has been made in the development of manufacturing technology that directly processes molten metal (including alloys; the same applies hereinafter) into thin metal strips using liquid quenching methods such as single-roll and twin-roll methods. The first important elemental technology in these direct plate making techniques is the plate making technique related to the uniformity of the plate thickness, surface properties, etc. of the quenched metal ribbon.

In almost all cases, the single roll process is used to produce wide amorphous alloy ribbons, which can be used for industrial applications such as ferrous materials for electrocadrans, by liquid quenching. There is. Many manufacturing methods and devices have been proposed in order to continuously and stably produce quenched metal ribbons with excellent uniformity of surface properties and thickness using a single roll method.

In other words, it goes without saying that an alloy composition with excellent amorphous formation ability is used as the melting raw material, but also the temperature and injection pressure of the molten alloy, the material and tip shape of the pouring nozzle, the gap between the nozzle and the roll, and the cooling roll. It is known that the circumferential speed, the material of the cooling roll, its surface properties, etc. are fundamentally important manufacturing conditions for the production of quenched metal ribbons.

Several instability factors have been found in the single-roll process for producing quenched metal ribbons, but in particular, in the production of quenched metal ribbons with good surface texture, the influence of the surface texture of the cooling roll is particularly important. Extremely large.

This is because the cooling roll is a device that removes heat from the molten metal to rapidly cool it, and since its surface is in contact with the quenched metal ribbon, it is considered to be an important factor in determining the surface properties of the ribbon. Therefore, many efforts have been made to obtain an optimal cooling roll surface.

For example, Japanese Utility Model Publication No. 45955/1982
As proposed in Japanese Patent Publication No. 35046, cooling rolls have been modified using in-line surface processing equipment to adjust the surface of the cooling roll. 59-130655
As proposed in the above publication, the surface of the cooling roll has been cleaned using a brush roll, a buff roll, etc. before and during the plate making operation.

However, the biggest problem with the prior art is that quantitative parameters for evaluating the surface of the cooling roll have not been clarified. That is, the surface of the cooling roll, which has been modified in advance by the surface processing device, gradually changes as the plate making progresses, and the surface properties of the quenched metal ribbon change accordingly.

As a means of evaluating the surface quality, a method is used in which the surface profile is determined using a stylus roughness meter at -M, and the maximum height Rmax, center line average roughness Ra, ten point average roughness Rz, etc. are determined and evaluated. I've been exposed to it.

In order to evaluate changes in the surface of the cooling roll, a method using center line average roughness Ra measured with a stylus roughness meter is considered. Fig. 11 shows the relationship between the center line average roughness Ra of the cooling roll surface and the plate making time.As is clear from Fig. 11, the center line average roughness Ra changes as the plate making progresses. No changes observed. In addition, the maximum height Rmax,
Even when the ten-point average roughness Rz was used, exactly the same results were obtained. Therefore, it is impossible to evaluate the surface quality of a cooling roll for producing rapidly cooled metal ribbon using a measurement method using a stylus roughness meter.

Furthermore, since the surface properties of the cooling roll change from moment to moment as the plate making progresses, it is necessary to evaluate the surface of the cooling roll online in order to capture such changes over time. However, since the cooling roll during plate making rotates at high speed, the method using a stylus roughness meter cannot be applied at all to such requirements.

Also, the above-mentioned Utility Model Publication No. 61-45955, JP-A-58
The methods and devices for modifying and cleaning the cooling roll surface disclosed in Japanese Patent Application Laid-open No. 35046, Japanese Patent Application Laid-Open No. 58-25848, and Japanese Patent Application Laid-Open No. 59-130655 do not use any information on the surface of the cooling roll. Since revisions and cleaning are carried out without any effort, it is not only inefficient, but also makes it impossible to evaluate the effectiveness of implementation.

[Problems to be Solved by the Invention] An object of the present invention is to analyze operation data in plate making in relation to the manufacturing process when producing rapidly cooled metal ribbons such as amorphous alloy ribbons. In addition, we track the modification status of the cooling roll surface, the polishing status with brush rolls, and changes in the cooling roll surface properties due to manufacturing online, and grind the cooling roll surface during plate making based on the measured values of the cooling roll surface. It is an object of the present invention to provide a manufacturing method and apparatus for polishing or grinding and polishing the surface of a cooling roll before and after plate manufacturing.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention injects molten metal onto the surface of a cooling roll rotating at high speed through a pouring nozzle having a slit-like opening and rapidly solidifies it. In the method of manufacturing a quenched metal ribbon using a method, the surface roughness of the cooling roll used for plate making between the position where the quenched metal ribbon is peeled off from the cooling roll and the pouring nozzle position is measured online during plate making,
The present invention provides a method for manufacturing a rapidly solidified metal ribbon, which is characterized in that the plate-making conditions are determined based on the measured values. In this case, the means for measuring surface roughness online can be a means for optically measuring surface roughness. Also,
The surface roughness can be evaluated using the ratio of the area where the inclination angle of the geometric profile of the surface fine shape is near O. Furthermore, the surface of the cooling roll may be ground or polished during production of the quenched metal ribbon based on the measured value of the surface roughness of the surface of the cooling roll.

The apparatus of the present invention for suitably carrying out the above method of the present invention includes:
In a device that manufactures a quenched metal ribbon by injecting and rapidly solidifying molten metal through a pouring nozzle having a slit-shaped opening on the surface of a cooling roll that rotates at high speed, from the quenched metal ribbon peeling position of the cooling roll. This quenched metal ribbon manufacturing apparatus is characterized by being equipped with a device that measures the surface roughness of the cooling roll online while the cooling roll reaches the pouring nozzle position. With this device, an optical surface roughness meter can be used as a device for measuring surface roughness online, and furthermore,
The device may be equipped with a device that evaluates the surface roughness using the ratio of the area where the inclination angle of the geometric profile of the surface fine shape is near O. It is preferable to include a device for grinding or polishing the surface of the cooling roll during manufacturing.

In the present invention, the ratio of the area where the inclination angle is near O refers to the flat area ratio, which can be determined as follows.

Measure the surface unevenness, and measure m points, y at pitch ΔX in the X-axis direction.
When n values are obtained at a pitch of Δy in the axial direction, the measurement area becomes an area of Δxx(m-1)xΔyx(nl). The slope value ΔZi,j is determined for (m-1)Xn by calculating the difference between adjacent data in the X-axis direction, and the proportion of the data satisfying ΔZi,j≦α to the whole is determined.

Further, the vicinity of 0 refers to a range that can be considered as substantially O, and specifically, it is 0±2 degrees or less.

[Operation 1] In the present invention, the surface roughness of the cooling roll is measured online between the position where the quenched metal ribbon is peeled off from the cooling roll and the pouring nozzle position, that is, the position where the surface of the cooling roll is exposed. Unlike the conventional method of measuring the surface roughness of a stopped cooling roll using, for example, a stylus method, the measurement results can be reflected in the process at any time, and the surface quality of the rapidly cooled metal ribbon can be improved. Helpful for improvement.

Although the method and device for measuring surface roughness online are not particularly limited, optical methods and devices that measure the reflected intensity of light are suitable.

The apparatus and method of the present invention will be explained using the drawings, taking as an example the manufacture of an amorphous alloy ribbon.

Figure 7 is a diagram schematically showing an example of a bird's-eye view obtained using a three-dimensional roughness meter on the surface of the cooling roll before plate making, that is, immediately after modification, and Figure 8 is a diagram showing an example of a bird's-eye view obtained using the same method. FIG. 2 is a diagram schematically showing an example of a bird track diagram on the surface of a cooling roll after plate manufacturing. Comparing Figures 7 and 8, we can see that only grooves due to modification are observed on the surface of the cooling roll before plate making, while minute irregularities are found on top of these grooves on the surface of the cooling roll after plate making. I can see that they overlap.

In order to evaluate the surface of a cooling roll having such a shape, the center line average roughness Ra and the maximum height R, which have been conventionally used, are used.
It is clear that max cannot be used. In other words, since Ra and Rmax are calculated as amounts corresponding to the area average or maximum deviation of the geometric profile of the surface, it is possible to evaluate the grooves caused by recutting, but it is difficult to evaluate the increase or decrease of minute irregularities. It cannot be accurately evaluated.

In order to analyze the surface properties of the cooling roll in detail, frequency analysis of the surface profile was performed. FIG. 9 is a diagram showing an example of the results of frequency analysis performed on the surface of the cooling roll before sheet manufacturing, and FIG. 10 is a diagram showing an example of the results of frequency analysis performed on the surface of the cooling roll after sheet manufacturing. . The results of frequency analysis revealed that plate making reduces the peak in the low frequency region, while increasing the high frequency component. Since this high frequency component corresponds to the minute irregularities seen in FIG. 8, the method for evaluating the surface of the cooling roll for producing rapidly solidified metal ribbon must be a method that can detect this high frequency component.

As a means for detecting this high frequency component and accurately evaluating the surface of the cooling roll, a method using the proportion of the area where the surface fine shape, that is, the inclination angle of the surface profile is near O, is suitable. As shown in Fig. 7, the steep part of the recessed grooves on the surface of the cooling roll before plate production has a large inclination angle.
In other areas, the angle of inclination is small and it can be considered as a flat portion.

On the other hand, as shown in FIG. 8, on the surface of the cooling roll after plate making, in addition to the steep portions due to the revised grooves, minute uneven portions exhibit large inclination angles. Therefore, when comparing the ratio of the area where the inclination angle of the surface profile is close to O before and after plate making, it is found that after plate making, it decreases by the amount of bone generated in minute irregularities, that is, the increase in the high frequency component of the profile.

For the above reasons, by using the above ratio, it is possible to quantitatively evaluate the surface of the cooling roll for producing rapidly cooled metal ribbon.

Furthermore, when measuring the surface of the cooling roll online, for example, by using a method and apparatus that measure the reflection intensity of a laser beam having a single wavelength as a luminous flux, it is possible to detect high frequency components on the surface of the cooling roll.

The intensity and distribution of reflected light from the surface of the cooling roll before plate making is determined by the geometric factors of the surface profile represented by the modified grooves. However, the intensity and distribution of the reflected light from the surface of the cooling roll after plate-making is affected not only by geometric factors but also by diffraction factors due to minute irregularities. In other words, while the radius of curvature of the revised groove is sufficiently large compared to the wavelength of the light beam, the radius of curvature of the minute irregularities is approximately the same as the wavelength of the light beam, so light scattering due to decreased diffraction increases. As a result, the intensity of reflected light after plate making is much lower than the intensity of reflected light before plate making. Furthermore, by adjusting the wavelength of the light beam and the angle of incidence on the surface of the cooling roll, it is possible to optimize the detection sensitivity of high frequency components on the surface of the cooling roll based on the intensity of reflected light.

Figure 5 shows the relationship between the reflected light intensity on the cooling roll surface and the ratio of the area where the inclination angle of the cooling roll surface profile is near 0, and it is recognized that there is a strong correlation between the changes in both. It will be done.

By evaluating the surface of the cooling roll during plate making, conditions for producing a ribbon with good surface properties can be established. That is, by comparing the surface roughness of the ribbon surface after winding with the measured value of the cooling roll surface during plate making, the optimum cooling roll surface condition can be determined. Therefore, by grinding and polishing the cooling roll based on the measured value of the surface of the cooling roll during plate making, it is possible to maintain an optimal cooling roll surface condition at all times. As a result, it becomes possible to produce a rapidly solidified metal ribbon having good surface roughness over its entire length.

FIG. 1 is a block diagram schematically showing the apparatus of the present invention, which is an apparatus for suitably carrying out the method of the present invention.

Figure 1 shows that molten metal injected from a pouring nozzle 1 is ultra-quenched and solidified on the surface of a cooling roll 2 rotating at high speed, forming an amorphous alloy ribbon 3, which is then peeled off from the cooling roll by a gas knife 4. The figure shows how the winder is blown toward the winder (not shown) by the fan 12.

Here, to adjust the surface properties of the cooling roll,
Roll modification is performed using a cemented carbide tool before plate making operations. In addition, the brush roll 5 made of stainless steel wire with a diameter of 0.08 mm and the buff roll 6 made of gauze wrapped around a core metal many times rotate on their own axis, so they come into contact with a cooling roll during plate making to adjust the roll surface. It is served to. In the same figure, the state of the amorphous alloy ribbon 8 when it is being tensioned by the winding machine and forming a pass line at the position of the deflation crawl 7 after the cart 13 has moved is also shown by dotted lines. has been done.

The light projection unit 22 is a device that projects a light beam 25, such as a laser, and projects the light beam 25 onto the surface of the cooling roll 2 at an appropriate incident angle. The light receiving section 22 is a device that receives reflected light 26 reflected on the surface of the cooling roll 2, and generates a signal according to the intensity of the received reflected light. Arithmetic device 2
3 receives the signal from the light receiving section 22, performs calculations necessary to evaluate the surface of the cooling roll 2 from the reflected light intensity, and outputs the calculation results by the output device 24.

In the apparatus shown in FIG. 1, in order to eliminate error factors caused by variations in luminous intensity of the light projecting section 21, a beam sampler 27 as shown in FIG. It is detected by the second light receiving section 28, and the evaluation result is corrected using the detected value.

In the apparatus shown in FIGS. 1 and 2, the light projecting section 21 and the light receiving section 22
, the beam sampler 27, and the second light-receiving unit 28 are installed at an intermediate position between the buff roll 6 and the pouring nozzle 1, because upstream of the peeling point of the quenched metal ribbon, the just-made metal ribbon is placed on the surface of the cooling roll. Because it is in close contact with the surface of the cooling roll, it is not possible to measure the surface of the cooling roll used for plate making.Also, brush rolls, buff rolls, etc. are used to remove thin strips, dust, etc. from the cooling roll surface, and the surface roughness is maintained at a constant level. This is because it can be used as a test surface for measurement.

If measurements are taken after plate-making operations, as has been done in the past, it is also possible to measure with a general stylus-type surface roughness meter and analyze it carefully. However, in order to relate it to the surface quality of the rapidly solidified metal ribbon, it is necessary to evaluate the surface quality of the cooling roll on-line at the same time as the plate production, and an optical method is particularly preferred.

The optical method is preferred because the cooling roll rotates at high speed, making it difficult to apply a contact method such as a stylus method. Furthermore, it is also suitable for a remote surface roughness measurement method that a hot molten metal or a pouring gauge such as a pouring nozzle be located close to the cooling roll.

The calculation device 23 can calculate the proportion of the area where the calibrated inclination angle of the surface profile is near O from the reflected light intensity. Although it is possible to use a theoretically determined calibration curve in the calculation, it is more practical to use a calibration curve obtained in advance through preliminary experiments. For example, by conducting an experiment in which the plate-making time of an amorphous alloy ribbon was changed in stages, and by examining the correlation between the reflected light intensity at the end of each experiment and the measurement results of the surface profile of the cooling roll 2, a calibration curve could be drawn. is obtained. In addition, as a method for determining the proportion of the area where the inclination angle of the surface profile is near O, the surface profile is measured with a stylus-type three-dimensional roughness meter, the difference of the measured profile is digitally calculated, and a certain threshold value is calculated. There is also a method of determining the proportion of the portion having the following inclination angle.

FIG. 3 shows an example of a device that grinds or polishes the surface of the cooling roll during plate making based on the measured value of the surface of the cooling roll, and the control device 29 uses the measured value of the surface of the cooling roll obtained by the calculation device 23. The system receives the information and controls the push amount and rotation speed of the brush roll so that the surface of the cooling roll is in an optimal condition.

[Example] Using the apparatus schematically shown in FIG.
After supplying the molten alloy with the composition (atomic %) of BI2S 17C1, the stopper 10 above the molten metal nozzle 1 is opened, and an internal water-cooled copper alloy cooling device that rotates at a high speed of 25 m/sec from the opening slot of the pouring nozzle is placed. When the molten metal was injected onto the surface of the roll 2, it adhered to the surface of the cooling roll 10.
An amorphous alloy ribbon 3 with a width of 0 mm was produced.

Next, the amorphous alloy ribbon closely adhered to the cooling roll surface is peeled off by a gas knife 4 using a plate-shaped high-speed air flow controlled at approximately 3 kg/cm'', and then blown to a winding machine (not shown) by a fan 12. I let it happen.

After the flying amorphous alloy ribbon is captured by the vinyl roll 11 on the trolley 13, the trolley is moved to the rear of the winder, conveys the amorphous alloy ribbon, and then moves at the same speed as the cooling roll. I glued it to the take-up reel of a rotating winder and started winding it.

When the winding tension of the winder was controlled to approximately 3 kg/mrn', a stable pass line was formed, allowing continuous plate making and
Winding was achieved. After continuing to make plates in this state for about 20 minutes, production was stopped.

FIG. 4 shows the results of evaluating the surface properties of the cooling roll 2 during this plate-making process using the apparatus according to the present invention. The light projecting unit 21 used here is a laser diode pumped YA
It is a G laser, and a Ge (germanium) photodiode and an analog amplifier are used as the light receiving section 22.

The calculation device 23 calculated the ratio of the area where the inclination angle of the surface profile calibrated from the surface reflection light intensity of the cooling roll 2 was 0°±2°.

By investigating the surface properties of the amorphous alloy ribbon wound on the winding machine off-line, it is possible to make it correspond to the surface evaluation results of the cooling roll shown in Fig. 4, and the surface evaluation results of the cooling roll using this device can be found. obtained results that accurately show the surface changes accompanying the progress of board making.

Furthermore, in the apparatus shown in FIG. 3, the pushing amount of the brush roll 5 is feedback-controlled using the control device 29 so that the calculated value by the calculation device 23 is almost constant during sheet manufacturing, so that the quenched metal ribbon is manufactured. did. Figure 6 shows the results of evaluating the cooling roll surface that differs depending on the presence or absence of feedback control. I was able to keep it in good condition. It was also found that the ribbon produced under feedback control maintained good surface properties.

Based on the evaluation results of the cooling roll surface obtained by the present invention, by performing online grinding of the cooling roll surface, it is possible to maintain good properties of the cooling roll surface even during sheet manufacturing, thereby making it possible to surface quality can be improved.

[Advantageous Effects of the Invention 1] According to the present invention, changes in the cooling roll surface during the plate-making process of quenched metal ribbon by the single roll method can be measured online, and the measurement results can be used to determine the surface quality of the quenched metal ribbon. Therefore, the effectiveness of the present invention in improving the surface properties of rapidly solidified metal ribbons is extremely large.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram schematically showing one embodiment of the present invention, and FIG.
The figure is an explanatory diagram schematically showing an example of correcting measurement errors due to fluctuations in luminous intensity of the light projecting part, FIG. 3 is an explanatory diagram showing an example of a device for grinding or polishing the surface of a cooling roll according to the present invention, and FIG. Figure 5 is a diagram showing the results of evaluating the surface properties of the cooling roll in the plate-making process of rapidly quenched metal ribbon using the apparatus according to the present invention. A graph showing the relationship between the ratio of neighboring areas, and FIG. 6 is a graph showing the results of evaluating the surface properties of the cooling roll when the cooling roll surface was ground using the apparatus according to the present invention during rapidly cooling metal ribbon manufacturing. , 7th
The figure is a bird's-eye view schematically showing an example of the cooling roll surface before plate making, Figure 8 is a bird's-eye view schematically showing an example of the cooling roll surface after plate making, and Figure 9 is a bird's-eye view schematically showing an example of the cooling roll surface before plate making. Graph showing an example of the results of frequency analysis of the surface profile, No. 10
The figure is a graph showing an example of the results of frequency analysis of the profile of the cooling roll surface after plate making, and FIG. 11 is a diagram showing the relationship between the center line average roughness Ra of the cooling roll surface and the plate making time. 1...Pouring nozzle 2...Cooling roll 3.
8... Amorphous alloy ribbon 4... Gas knife 5...
Brush roll 6...Buff roll 7...Deflector roll 9...Tandish roll 10...Stopper 11...Pinch roll 12...Fan 13...Dolly 21...Light emitter
22... Light receiving section 23... Arithmetic device
24... Output device 25... Luminous flux 2
6...Reflected light 27...Beam sampler 28...Second light receiving section 29...Control device Applicant Hitozaki Steel Co., Ltd. Plate making time Fig. 4 (&) Fig. 6 Fig. 7 Fig. 8 Figure 9 Liquid length (mm) Figure 10

Claims (1)

[Scope of Claims] 1. In an apparatus for producing a quenched metal ribbon by injecting molten metal onto the surface of a cooling roll rotating at high speed through a pouring nozzle having a slit-shaped opening and rapidly solidifying the molten metal, The surface roughness of the cooling roll used for plate making between the position where the ribbon is peeled off from the cooling roll and the pouring nozzle position is measured online during plate making, and the manufacturing conditions are determined based on the measured value. Characteristic method for manufacturing quenched metal ribbon. 2. The method for producing a rapidly solidified metal ribbon according to claim 1, wherein the means for measuring surface roughness online is a means for optically measuring surface roughness. 3. The quenched metal ribbon according to claim 1 or 2, wherein the means for measuring the surface roughness is to evaluate the surface roughness using the ratio of the area where the inclination angle of the geometric profile of the surface fine shape is near 0. Production method. 4. The method of manufacturing the quenched metal ribbon according to claim 1, wherein the manufacturing conditions are determined after grinding or polishing the surface of the quench roll during manufacture of the quenched metal ribbon based on the surface roughness measurement value of the surface of the quench roll. Production method. 5 In an apparatus for producing a quenched metal ribbon by injecting molten metal onto the surface of a cooling roll rotating at high speed through a pouring nozzle having a slit-shaped opening and rapidly solidifying the molten metal, exfoliating the quenched metal ribbon from the cooling roll. 1. An apparatus for producing rapidly cooled metal ribbon, characterized by being equipped with a device that measures the surface roughness of a cooling roll online between the position of the pouring nozzle and the position of the pouring nozzle. 6. The apparatus for producing a rapidly solidified metal ribbon according to claim 5, wherein the apparatus for measuring surface roughness online is an optical surface roughness meter. 7. The quenched metal ribbon according to claim 5 or 6, wherein the device for measuring the surface roughness is a device for evaluating the surface roughness using the ratio of the area where the inclination angle of the geometric profile of the surface fine shape is near 0. Manufacturing equipment. 8. The apparatus for producing a quenched metal ribbon according to claim 5, further comprising a device for grinding or polishing the surface of the quenched metal ribbon during the production of the quenched metal ribbon based on the surface roughness measurement value of the surface of the quench roll. .