JPS63115656A - Manufacturing device for super rapid cooling thin metal strip capable of plate thickness control - Google Patents

Abstract

PURPOSE:To correctly control the plate thickness of a thin plate in the necessary value by moving at least one part of a nozzle and cooling roll so that the virtual vertical plane passing the center of the cooling roll along the virtual horizontal plane on the cooling roll may be moved to the rotary direction side of the cooling roll. CONSTITUTION:In case of a molten metal being injected in a specific amount from a nozzle 1 by rotating a cooling roll 2 at constant speed, it is cooled by the surface of the cooling roll 2 and attained to a thin plate 10. It is then fed out between guide rolls 13 from a guide plate 12, passed through plate width detectors 5a, 5b and the plate width is detected. Then plate thickness is then calculated by an arithmetic circuit 6 from the detection value and compared with the necessary plate thickness value set by an input device by an arithmetic, control circuit 8. The nozzle moving amount is then calculated in order to change the gap between the nozzle and roll so as to approach to the necessary plate thickness value. A motor 9 is then driven based on the nozzle moving amount, a moving mechanism 4 is driven and the gap between the nozzle and roll is controlled so as to attain to the necessary plate thickness.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for producing an ultra-quenched metal ribbon, and more particularly to a production apparatus for continuously producing a ribbon of uniform thickness. .

[Prior art]

It is well known that a metal ribbon having an amorphous or microcrystalline structure is produced by jetting molten metal from a nozzle onto the surface of a rotating cooling roll.

The metal ribbon produced in this way has a wide variety of uses, but its quality standards are very strict.

For example, in the application of magnetic materials, the thickness of the ribbon is important because it directly affects the magnetic properties, particularly the effective magnetic permeability or iron loss at high frequencies.

In the production of thin strips, in order to control the thickness to a desired value (1
) It is necessary to detect the thickness of the manufactured board. (2) It is necessary to control the manufacturing apparatus based on the difference between the detected board thickness and the desired board thickness.

In conventional devices, the thickness of the plate is detected by actually measuring the thickness of the manufactured plate.

On the other hand, factors that determine the plate thickness include the gap between the nozzle and the roll, the circumferential speed of the cooling roll, the amount of molten metal discharged from the nozzle, and the surface temperature of the cooling roll. In conventional control (2), control is performed using one of these conditions or a combination of a plurality of conditions.

According to experiments conducted by the present inventors, it has been found that controlling the gap between the nozzle and the roll has a large contribution to changes in plate thickness and a fast response.

By the way, the conventional method for controlling the gap between the nozzle and the roll is to provide a mechanism that moves the nozzle and the cooling roll, or at least one of them, in the vertical direction relative to each other, and to adjust this moving mechanism to the difference between the actual value and the desired value. Based on the control drive, the gear between the nozzle and the roll was controlled.

[Problems to be solved by the invention]

In the conventional mechanism for controlling the gap between the nozzle and the roll, since the direction of movement is the vertical direction and the amount of movement directly corresponds to the amount of change in the gap, 2, for example, 1/100.
-There is a problem that the equipment must be large and expensive to obtain the following accuracy.

On the other hand, when it comes to actually measuring plate thickness, since the manufactured ribbon is moving at high speed, the equipment must be used to accurately read the plate thickness. Further, during manufacturing, scraps are drawn into the contact surface between the cooling roll and the molten metal, which changes the pit formation state and surface roughness, thereby affecting the apparent thickness of the plate.

Therefore, it is difficult to actually measure the exact plate thickness.

In view of the above points, the first object of the present invention is to provide an apparatus that can easily and accurately control the nozzle-roll gap in order to control the plate thickness.

Furthermore, the second object of the present invention is not only to simplify the control of the gap between the nozzle and the roll, but also to indirectly measure the plate thickness by detecting the plate width without measuring the plate thickness, which is difficult to measure. It is an object of the present invention to provide an apparatus that can obtain an accurate plate thickness by measuring the plate thickness, thereby easily and accurately controlling the plate thickness.

[Means and effects for solving the problem] According to the present invention, in an apparatus for manufacturing an ultra-quenched metal ribbon by jetting molten metal from a nozzle onto the surface of a rotating cooling roll, the thickness of the manufactured ribbon can be adjusted. and a means for measuring the thickness of the cooling roll, the nozzle being positioned at a virtual horizontal contact surface on the cooling roll with respect to the cooling roll, in order to control the gap between the nozzle and the cooling roll according to the thickness measured by the measuring means. means for controllingly moving at least one of the nozzle and the cooling roll to move in the direction of rotation of the cooling roll with respect to an imaginary vertical plane passing through the center of the cooling roll; The present invention is characterized in that the thickness of the manufactured ribbon is controlled to a desired value.

According to this configuration, as will be clear from the explanation given below regarding FIG. It may be small, and since the amount of change in the gap with respect to the amount of movement is small, fine adjustment of the gap is facilitated, and the accuracy of gap control is improved.

Still another feature of the present invention is that the measuring means includes a means for detecting the width of the produced ribbon and calculating the thickness based on a predetermined relationship from the width of the ribbon detected by the detection means. It consists of arithmetic means for

Many studies have been conducted on the correlation between the manufacturing conditions of ultra-quenched metal thin strips and the thickness of the thin strip.2 For example, in the Japan Iron and Steel Institute Hyakude Memorial Technical Lecture (published in 1986), there is
It is stated that there is a strong correlation with the plate width W as shown in equation (1).

H=Q/(W-u)...(1)
Q: Nozzle exit flow rate (constant) U: Cooling roll circumferential speed (constant) On the other hand, in two experiments conducted by the present inventor, as shown in Fig. 6, when the amount of molten metal coming out of the nozzle is constant, There is a strong correlation between strip thickness and strip width, especially the gap between the nozzle and roll, which is a factor that controls strip thickness.
Cooling roll rotation speed.

When the correlation between plate thickness and plate thickness was confirmed using one of the conditions of molten metal ejection pressure as a variable, it was confirmed that the correlation was particularly strong when the gap between the nozzle and roll was used as a variable. Therefore, if the plate width is measured accurately,
The plate thickness can then be calculated. Measuring the width of a ribbon during manufacture is much easier and more accurate than measuring the thickness.

That is, according to the second feature of the present invention, the plate thickness can be determined with high accuracy.

〔Example〕

Two embodiments of the present invention will be described below with reference to the drawings.

Referring to FIG. 1, the manufacturing device shown in FIG.
．． Rotating cooling rolls placed below 2. Molten metal tank storing melted metal 3. a nozzle moving mechanism 4 that horizontally moves the nozzle together with the molten metal tank 3; a strip width detection mechanism 5a that detects the width of the ribbon 10 sent out from the cooling roll 2;
5b, from the plate width detected by the plate width detection mechanisms 5a and 5b,
an arithmetic circuit that calculates the plate thickness from the relationship such as the above-mentioned equation (1);
Input device 7 for plate thickness setting to set desired plate thickness
, compare the plate thickness output from the arithmetic circuit 6 and the desired plate thickness set by the input device 7, and move the nozzle to make the gap between the nozzle and the cooling roll correspond to the desired plate thickness value. It is composed of an arithmetic control circuit 8 that calculates the amount of movement, and a drive motor 9 that is controlled by the output of the arithmetic control circuit 8 and drives the moving mechanism 4.

In addition, in Figure 1, 11 is a ribbon winding device, 12 is a ribbon guide plate,
13 is a ribbon guide roll.

The plate width detection mechanisms 5a, 5b and the arithmetic circuit 6 constitute a plate thickness measuring device.Although a device for actually measuring plate thickness may be used instead of these, the plate width detection mechanisms 5a, 5b and the calculation circuit 6 constitute a plate thickness measuring device. It is preferable to use circuit 6.

Furthermore, the moving mechanism 4. Arithmetic control circuit 8. The input device 7 and the drive motor constitute a nozzle control movement device. Here, only the nozzle 1 is moved, but the cooling roll 2 may be moved horizontally, or both may be moved in opposite directions.

Note that the arithmetic circuit 6 and the arithmetic control circuit 8 may be realized by one microcomputer.

Next, with reference to FIG. 2, the control of the gap between the nozzle and the roll during the horizontal movement of the nozzle 1 will be explained.

In Fig. 2, the nozzle 1 is first placed at the top A of the cooling roll.
It is brought into contact with the cooling roll 2 at this point. after that,
Nozzle 1 along virtual horizontal contact surface B to cooling roll 2 at point A.

The cooling roll 2 is moved by a distance X in the direction of rotation at point A. As a result, a gap g is formed between the nozzle 1 and the cooling roll 2 as shown in the figure. It can be seen that the gap g at this time is given by g=r r"-x" (2), where r is the radius of the cooling roll 2.

That is, by controlling the horizontal distance X from the top point A of the cooling roll 2 of the nozzle 1, the gap g can be controlled. Furthermore, since the amount of change in g is smaller than the amount of change in X, fine adjustment of 2g is easy.

Note that the nozzle-roll gap fg can be created either by fixing the nozzle 1 and moving the cooling roll 2 (in the opposite direction to the nozzle movement), or by moving both. The good thing will be obvious from the above explanation.

A specific example of a moving mechanism for adjusting the gap g is as follows:
Positioning devices that combine linear guide rails and pulse motors used in general precision equipment can be used easily and with high precision (for example, ±1/1
00wa).

Referring to FIG. 3, a case will be described in which a Leh+, 2-can type micro gauge is used as an example of the plate width detectors 5a, 5b. The thin ribbon 10 is passed between the laser scanning light source 5a and the laser light receiving section 5b facing thereto. In this way, the laser scanning light 14 is blocked by the thin strip,
In the light receiving section 5b, the laser beam cannot be received in a region corresponding to the width of the ribbon 10. The scanning speed of this laser light and 1
The plate width is detected from the time during which radar light cannot be received during the scanning period.

Important factors for the detection accuracy of the plate width include the beam diameter of the laser beam, the sensitivity of the light receiving element, etc., but it is especially necessary that the thin plate to be measured be maintained stably. Therefore, the guide plate 12 and guide roll 13 shown in FIG. 1 are effective means for increasing detection accuracy.

In addition, as the plate width detector, an optical displacement measuring device or the like may be used. Next, the operation of the apparatus of the embodiment shown in FIG. 1 will be explained.

A desired metal (for example, an alloy of a desired composition) is melted in the molten metal tank 3. A desired plate thickness is input using the input device 7. A cooling roll 2 is rotated at a constant speed, and a constant amount of molten metal is spouted from a nozzle 1.

The spouted molten metal collides with the surface of the rotating cooling roll 20,
The thin ribbon 10 is cooled and fed from the guide plate 12 to between the guide rolls 13, passed between the width detectors 5a and 5b, passed through the guide rolls 13, and then wound onto the winding device 11.

When the thin strip 10 passes through the strip width detectors 5a and 5b, its strip width is detected, and the arithmetic circuit 6 calculates the strip thickness from the detected value. This calculated plate thickness is.

The arithmetic/control circuit 8 compares it with the desired plate thickness value set by the input device 7, and calculates the amount of nozzle movement for changing the nozzle-roll gap g so as to approach the desired plate thickness value. Ru. The drive motor 9 is controlled and driven based on this nozzle movement amount.

The moving mechanism 4 is driven. In this way, the nozzle-roll gap g is controlled to the desired plate width. 1st
A specific example of manufacturing a thin ribbon using the apparatus shown in the figure is given below.

Hereinafter, as the cooling roll 2, a copper roll with an outer diameter of 500 m and a width of 100 m and equipped with a water cooling device is used, and as the nozzle 1, a Tera silicon material is used.
, 3±V100) x (25,0±V100). The dimensional tolerance in this case is a value determined to ensure that under the same manufacturing conditions of the ribbon, the variation in plate thickness for each nozzle used is ±1 μm and the plate width is ±1 m or less. Note that the slit was processed using a super audio processing machine.

The metal of the ribbon to be manufactured is C07O-F5-Si15.
A 10 kg ingot was melted in a vacuum melting furnace using a master alloy of -B10, and then loaded into the molten metal tank 3. High-frequency induction heating was used for heating, and after melting, the material was further heated to 1300° C. to maintain the ribbon production temperature.

The initial setting value of the nozzle roll gap was g-0.15 mm with the above-mentioned value of X being 8.6.

The rotation speed of the cooling roll is 2000±5r, p, m.
The molten metal was spouted from the nozzle 1 by pressurizing the inside of the molten metal tank 3 to 0.5 to 9/cm 2 with Ar gas.

First, for comparison, the board width detectors 5a, 5b, y arithmetic circuit, and arithmetic control circuit 8. The ribbon was manufactured without operating the drive motor 9. The thickness of the produced ribbon was measured at various points along its length. The results are shown in FIG.

As is clear from FIG. 5, the thickness of the ribbon tends to gradually become thinner from the tip in the longitudinal direction of the ribbon.

In the end, the value of change in the longitudinal direction of the ribbon was 5 μm, which was very large.

Next, the plate thickness was set to 23 μm using the input device 7, and the plate width detectors 5a, 5b, arithmetic circuit, arithmetic control circuit 8, and drive motor 9 were operated to produce a ribbon.

Regarding each point in the length direction of the manufactured ribbon.

When the plate thickness was actually measured, the results shown in Figure 4 were obtained.

As is clear from Figure 4, immediately after the start of ribbon production, the plate thickness was about 24 μm, the same as when no control was applied, but after that, the thickness was about 50 μm.
After 0 m, it was almost constant at 23 μm. That is, a thin ribbon having a desired thickness was manufactured.

〔Effect of the invention〕

According to the present invention, the gap between the nozzle and the roll, which controls the thickness during the production of ultra-quenched metal ribbon, is adjusted by horizontally controlling and moving at least one of the nozzle and the cooling roll. Therefore, the driving force of the moving stopper is small, and the amount of change in the gap relative to the amount of movement is small, so fine adjustment of the gap is possible.
It has the advantage that accurate adjustment is possible with a small drive device.

Furthermore, instead of directly measuring the thickness of the manufactured plate, which is difficult to measure, the thickness of the manufactured plate is measured by measuring the width of the plate and indirectly measuring the width based on the strong correlation between the thickness and width. , the gap between the nozzle and roll is controlled, making it easy to measure plate thickness.
This has the advantage that it can be easily and accurately controlled, and therefore the plate thickness can be controlled easily and accurately.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an apparatus according to an embodiment of the present invention;
FIG. 2 is a diagram for explaining the principle of adjusting the nozzle-roll gap, and FIG. 3 is a diagram showing an example of board width detection.
FIG. 4 is a graph showing an example of the relationship between the ribbon length and plate thickness of the ribbon manufactured by the apparatus of the present invention, and FIG.
Figure 6 is a graph showing an example of the relationship between the length of the ribbon and the plate thickness when gear spacing control is not performed. Figure 6 shows the plate thickness when the amount of molten metal spouted from the nozzle is constant and other conditions are changed. It is a figure showing the relationship between and width. DESCRIPTION OF SYMBOLS 1... Nozzle, 2... Cooling roll, 3... Molten metal tank, 4... Nozzle movement mechanism, 5a, 5b... Board width detector, 6... Board thickness calculation circuit, 7. ... Input device for plate thickness setting, 8... Arithmetic/control circuit, 9... Drive motor,
10...thin obi. Fig. 1 Fig. 2 Fig. 3 Fig. 4 Length of the wei band...) tC fossa Jiuqing suspension

Claims (1)

[Claims] 1. In an apparatus for manufacturing an ultra-quenched metal ribbon by jetting molten metal from a nozzle onto the surface of a rotating cooling roll, a means for measuring the thickness of the manufactured ribbon; The nozzle passes through the center of the chill roll along a virtual horizontal contact surface on the chill roll, in order to control the gap between the nozzle and the chill roll depending on the measured thickness. means for controlling and moving at least one of the nozzle and the cooling roll so as to move in the direction of rotation of the cooling roll with respect to a virtual vertical plane, thereby adjusting the thickness of the manufactured ribbon to a desired value; An apparatus for manufacturing an ultra-quenched metal ribbon capable of controlling plate thickness. 2. In an apparatus for producing an ultra-quenched metal ribbon by jetting molten metal from a nozzle onto the surface of a rotating cooling roll, a means for detecting the width of the produced thin plate, and a means for detecting the width of the plate from the width detected by the detection means. A plate thickness measuring means comprising a plate thickness calculation means for calculating plate thickness based on a predetermined relationship, and controlling a gap between the nozzle and the cooling roll according to the plate thickness obtained by the measuring means. the nozzle moves relative to the roll along an imaginary horizontal contact surface on the cooling roll on the rotational side of the cooling roll with respect to an imaginary vertical plane passing through the center of the cooling roll; and means for controlling and moving at least one of the cooling rolls, thereby controlling the thickness of the manufactured ribbon to a desired value. Obi manufacturing equipment. 3. The apparatus for producing an ultra-quenched metal ribbon according to claim 2, wherein the detection means is a laser microgauge. 4. In the apparatus according to claim 1 or 2, the control moving means includes driving means for moving at least one of the cooling roll and the nozzle along the virtual horizontal plane, and a driving means for moving at least one of the cooling roll and the nozzle along the virtual horizontal plane, and a drive means for moving at least one of the cooling roll and the nozzle along the virtual horizontal plane, and calculating the amount of movement of at least one of the cooling roll and the nozzle by comparing the thickness measured by the measuring means and the desired value set by the setting means, and based on the calculated value. 1. An apparatus for producing an ultra-quenched metal ribbon, characterized in that it comprises arithmetic/control means for controlling the driving means.