JPH01218749A - Apparatus for manufacturing amorphous ribbon - Google Patents

Abstract

PURPOSE:To manufacture an amorphous ribbon having high quality by measuring gap between a nozzle for supplying molten metal and a single roll to find the heat crown rate of the single roll and properly correcting the gap at position forming the ribbon at the time of forming the amorphous ribbon by flowing down the molten metal on the single roll for cooling rotating at high speed and rapidly cooling. CONSTITUTION:The roll 2 composing of a roll shaft 21 and a sleeve 22 and making water cooling type of the hollow part 23 at intermediate part, is rotated at high speed and the molten metal is flowed down from the nozzle 1 in the vessel and rapidly cooled at about 10<5> deg.C/sec cooling speed to continuously produce the amorphous metal ribbon 3. In this case, the gaps between both end parts 1A, 1B and center part 1C of the nozzle 1 and the roll 2, and measured with an optical measuring instrument and also the intervals lA-lB between the roll shaft surfaces at the opposite positions to 1A-1C of the nozzle 1 and the inner face of the sleeve 22, are measured with ultrasonic detector 11A-11C embedded on the surface of the roll shaft 21. From these measured valve, the gap between the end part of the nozzle 1 and roll 2 is corrected to proper valve and the amorphous ribbon 3 having a little deviation of the ribbon thickness is surely manufactured.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention relates to a method and apparatus for manufacturing an amorphous ribbon, and in particular, by accurately measuring the gap between a nozzle and a roll, it is possible to produce an amorphous ribbon with little thickness deviation. The present invention relates to a method and apparatus suitable for manufacturing.

<Prior art> In general, a method for manufacturing an amorphous ribbon using a molten metal cooling method involves extruding molten metal from a crucible or the like through a nozzle using gas pressure or the like onto the surface of a cooling roll for rapid cooling that rotates at high speed. For example, it is known to solidify at a high cooling rate of about 10S"C/sec.
There are two types: the single roll method, which uses only one cooling roll, and the twin roll method, which uses two cooling rolls.

When manufacturing amorphous ribbons (hereinafter simply referred to as ribbons) using the single roll method, it is necessary to maintain the gap between the roll and the nozzle (hereinafter simply referred to as the gap) at a constant value in order to obtain a ribbon with a good shape and no voids. is necessary. For this reason,
It is important to accurately measure the gap during plate making.

Conventionally, as a gear measurement method, for example,
Optical means as disclosed in Japanese Patent No. 9460 is generally used.

That is, as shown in FIG. 5, the gap g between the roll 2 and the nozzle 1 at both or one end of the nozzle 1 where the ribbon 3 is not present is determined by optical means consisting of the light projecting section 4 and the light receiving section 5. It is measured by As this optical means, a generally known laser scanning method or CCD line sensor method can be applied.

All of these optical means utilize the fact that the amount of transmitted light from the light projecting section 4 changes depending on the gap g, and usually, as shown in FIG. 5(b), both ends IA of the nozzle 1 , IB, one set each is arranged as 4A, 5A and 4B, 5B.

<Problem to be solved by the invention> When measuring the gap g as described above, nozzle 1
As long as the positional relationship between the roll 2 and the roll 2 is in a parallel state, for example before the ribbon 3 is made, it is possible to measure with high accuracy with a measurement error of ±1 μm.

However, during plate making, a so-called heat crown occurs near the center portion 2C of the roll 2 that comes into contact with the ribbon 3 due to heat transfer from the molten metal which is in a high temperature state.
This occurs because the parallel relationship between nozzle 1 and roll 2 is lost.

That is, the plate shape of the ribbon 3 at this time is 0-ru 2
The contact surface with the nozzle 1 is replaced by a crown, and the free surface on the opposite side is flattened by the discharge surface of the nozzle 1, so it eventually takes on a concave shape.

Therefore, the truly required gap g at the location where the ribbon 3 contacts the roll 2 will differ from the measured value by the amount of heat crown of the roll 2.

Therefore, it is impossible to maintain the gap value at a desired value in the width direction of the plate during plate making, and this also becomes a cause of deterioration in the quality and yield of ribbon products.

As a means to solve such problems, for example,
It is about to be disclosed in Publication No. 9-49105.

As shown in FIGS. 5(a) and 5(C), the content is as shown in FIG. 5(a) and (C).
The eddy current distance meter 6A corresponds to both ends and the center of the
, 6B, and 6C to measure the amount of radial thermal expansion at both ends and the center of the roll 2,
This method calculates the heat crown value of the roll from the difference between them and corrects the measured value of the gap.

However, the heat crown value measured by this method is the value near the nozzle, and does not represent the required amount of heat crown directly below the nozzle. This is because the heat load in the circumferential direction of the roll usually differs, so the amount of heat crown is not constant at any position on the roll surface.

As described above, conventionally used eddy current distance meters, optical distance meters, and the like basically attempt to measure from the outside of the roll, so it must be said that they naturally have limitations. On the other hand, as disclosed in, for example, Japanese Unexamined Patent Publication No. 61-86058, the profile of the roll can be determined by embedding an ultrasonic probe with an oscillation frequency of IMHz inside the roll and detecting the reflected ultrasonic wave. There is a way to find out.

However, when the present inventors actually tried this method, the resolution during measurement was only about 20 μm at most, and the
It was found that the accuracy was considerably insufficient to measure the crown amount number of 0tIm.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method and apparatus for accurately measuring the crown amount and accurately controlling the gap amount.

<Means for Solving the Problems> The present invention provides a method for measuring the gap between the nozzle and the roll in an apparatus for manufacturing an amorphous ribbon consisting of a single roll whose inside is water-cooled and a nozzle for supplying molten metal. This amorphous ribbon manufacturing apparatus is characterized by comprising: a gap measuring device for measuring a roll heat crown value, a measuring device for measuring a roll heat crown value, and a control device for adjusting a gap between a nozzle and a roll.

A specific configuration of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view showing an embodiment according to the present invention,
FIG. 2 is a sectional view taken along the line A-A, and FIG. 3 is a block diagram of measurement and control. In the drawings, members that are the same as those in the conventional example are given the same reference numerals and explanations will be omitted.

In the figure, emitters 4A, 4B and receivers 5A, 5B
are attached to both ends IA and IB of the nozzle 1 in the same manner as in the conventional example, and measure the gap between the nozzle 1 and the roll 2. The inside of the roll 2 is composed of a roll shaft 21 and a sleeve 22, and a space 23 between the roll shaft 21 and the sleeve 22 is filled with cooling water supplied from a water supply pipe (not shown), and the sleeve 22 is heated from the inside. It is constantly cooled.

11A, IIB, and IIC are ultrasonic probes embedded in the surface of the roll shaft 21, and correspond to both ends IA, 113 and the center portion 1c of the nozzle 1, respectively, from the surface of the roll shaft 21 to the sleeve 22. Measure the distance to the inner surface of the In addition, the ultrasonic probes 11A and IIB.

As for the 11C type, one with an oscillation frequency of 25 MHz is preferable from the viewpoint of resolution (target resolution: 10 μm) and oscillation energy.

Measurement signals from these ultrasonic probes 11A, IIB', and IIC are transmitted via a cable 12 wired to the roll shaft core and connected to a slitting ring 13 attached to one end of the roll shaft 21.

A rotary encoder 14 detects the rotation angle of the roll 2, and is attached to the center of the end of the roll shaft 21.

15 is a roll heat crown calculation device, which inputs distance signals from the ultrasonic probes 11A, IIB, and IIC and rotation angle signals from the rotary encoder 14;
It has a function of calculating a roll heat crown value corresponding to each rotation angle of the roll 2.

Reference numeral 16 denotes a gap correction device, which inputs gap signals from the light receivers 5A and 5B, performs averaging processing, and calculates this average gap value by a roll heat crown calculation device 14.
It has a function to correct using the roll heat crown value calculated in .

Reference numeral 17 denotes a gap control device, which has a function of controlling the position of the nozzle 1 via an operator (not shown) based on the gap correction signal from the gap correction device 16, and adjusting the gap between the nozzle 1 and the roll 2. .

<For production> The operation of the present invention will be explained below.

First, the rotary encoder 14 detects the timing when the positions of the ultrasonic probes 11A, IIB, and IIC reach directly below the nozzle 1, and the distance from the roll shaft 21 to the inner surface of the sleeve 22 at that time is determined by each ultrasonic probe. Probe 11A, II
B. Measure at 1iC and find out those values! ,.

1,,pc.

Therefore, in the roll heat crown calculation device 15,
The roll heat crown amount Δ2 directly below the nozzle 1 is calculated using the following equation (1).

Δf = fi c-1/2 (1, + Ib)
-----------(1) Also, the gap amount at both ends IA and IB of the nozzle 1 at that time is received, W5A,
5B, and let those values be gA and g++, the gap correction device 16 calculates the average value g1 of the gap amount at this time using the following equation (2).

g-=1/2 (gA + gm)・−・−・−
・---−1・−・・−・−・・・・・−・−(2) Next, in this gap correction device 16, the gap average value g1 obtained by the equation (2) is calculated by the following equation (3). Correct it,
The true gap value g0 directly below the nozzle 1 is determined.

go””gm-Δ! −・・・−・・・・−・・・・・・・
−・・−・−−−−１−・−・−・−・−・・・・・−・
(3) The position of the nozzle 1 is controlled by outputting the gap value g0 thus obtained to the gap control device 17.

<Example> Examples of the present invention will be described below.

The main experimental conditions are as follows.

(a) Ultrasonic probe center frequency i25MHz (b) Roll sleeve Material: Cu-Be alloy Thickness: 15
mm Outer diameter; 400 mm Circumferential speed; 30 m/s Cooling water amount; 40 po/h (C) Target gap value between roll and sleeve; 400
μm (d) Gap sensor species 11. ．． ccD line sensor First, start spouting molten metal from the nozzle, and then
FIG. 4 shows an example of measurement of roll heat crown values at the center of the roll and at both ends in a steady state after seconds have elapsed.

In this figure, curve E is the average value of the radial distance from the center point O at both ends of the roll, and curve F is the average value of the radial distance from the center of the roll. The difference between these curves E and F corresponds to the roll heat crown value, which is the minimum value of 180 tIm at A directly below the nozzle, while the maximum value is 330 μm at the contact point B with the ribbon in the 90° direction.
, 300 μm at the roll separation part C of the ribbon, and 240 μm at the non-contact part with the ribbon in the 90° direction.
It can be seen that it varies greatly depending on the rotational position of the roll. .

Judging from these results, when measuring the roll heat crown using a method such as an eddy current distance meter in the conventional example described above, it is limited to measurement near the hollow part in the diagram due to location constraints. is 60 μm (=
It is clear that there is a measurement error of as much as 240 μm - 180 tIm).

Next, ribbon forming experiments were conducted five times each using the conventional method in which an eddy current distance needle was installed in the above-mentioned part to measure the amount of roll heat crown and correct the gap value for control, and the method using the present invention. The results are shown in Table 1.

Table 1 As is clear from this table, the method of the present invention is superior in both the plate thickness deviation and the number of pores.

<Effects of the Invention> As explained above, according to the method of the present invention, the gap value is corrected by the roll heat crown value directly under the nozzle, so it is possible to improve the shape and quality of the amorphous ribbon. .

Moreover, the second aspect of the present invention is an apparatus suitable for carrying out the method having the above-mentioned effects.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention, and FIG.
1 is a sectional view taken along the line A-A in FIG. 1, FIG. 3 is a measurement/control block diagram, FIG. 4 is a side view schematically showing the distribution of roll heat crown when the present invention is applied, and The figure is (a) a side view showing a conventional example. (B) Plan view. (C) Front view. 1...nozzle, 2...roll. 3...Amorphous ribbon (ribbon). 4... Emitter, 5... Light receiver, '6
... Eddy current distance meter, 11... Ultrasonic probe. 13...Slip ring. 14...Rotary encoder. 15...Roll heat crown calculation device. 16... Gap correction bag device, 17... Gap control device. Patent applicant: Kawasaki Steel Corporation Figure 1A. 23 7C23 S Yo: 2: ;: Yu12'I" 77C11+ 1! Figure 3 Figure 4 <a> (c) (b)

Claims (1)

[Claims] An apparatus for manufacturing an amorphous ribbon comprising a single roll whose interior is water-cooled and a nozzle for supplying molten metal, comprising: a gap measuring device for measuring the gap between the nozzle and the roll; and a roll heat device. An amorphous ribbon manufacturing device comprising: a measuring device for measuring a crown value; and a control device for adjusting a gap between a nozzle and a roll.