JP2000263193A - Gap meter for single roll method casting and production of rapidly cooled and solidified strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure a narrow gap at high precision, even in the case of being high temp. atmosphere by directing a laser beam from a laser beam generator into the gap between the surface of a cooling roll and the opening part of a nozzle, vivrating the laser beam in the diameter direction and detecting the quantity of heat of the laser beam passed through the gap. SOLUTION: The laser beam generator is composed of a laser head 9 for generating the laser beam and a laser beam driver 10 for driving this laser beam, and a calory meter is composed of a calorimeter head 13 for detecting the heat quantity of the laser beam and an energy meter 14 for converting the detected heat quantity into an electric signal. The electric signal of the energy meter 14 is converted into the gap value. A scanner 11 is directed to the gap by reflecting the laser beam from the laser head 9 and also, the laser beam is driven to turn in the arrow mark direction by working the laser head driver 10 and vibrated in the diameter direction. In this way, the rapidly cooled and solidified metal strip having good precision of the strip thickness and high performance is stably obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a rapidly solidified ribbon such as an amorphous alloy ribbon by a single roll method, and supplies a circumferential surface of a cooling roll rotating at a high speed and a molten metal to the circumferential surface. TECHNICAL FIELD The present invention relates to a gap meter for measuring a gap between a nozzle opening to be formed and a method for producing a rapidly solidified thin ribbon using the gap meter.

[0002]

2. Description of the Related Art A single roll method is known as a method for producing a rapidly solidified ribbon such as an amorphous alloy ribbon. In this method, as shown in the example of FIG. 1, the molten metal 2 in the tundish 1 is discharged from a nozzle 3 onto the circumferential surface of a cooling roll 5 rotating at a high speed to be rapidly cooled and solidified. The ribbon 6 of an amorphous or crystalline alloy or a pure metal is manufactured. 4 is a tundish stopper.

The opening of the nozzle 3 has a slit shape, and the slit length corresponds to the width of the ribbon 6. Further, depending on the slit length and slit width, the gap between the opening of the nozzle 3 and the cooling roll 5, and the rotation speed of the cooling roll 5, the cooling speed of the molten metal 2 on the cooling roll 5 and the Thickness is dominant.

Therefore, it is extremely important to set the gap between the opening of the nozzle 3 and the cooling roll 5 to a predetermined appropriate value when producing the rapidly solidified ribbon by the single roll method. If the gap is too wide, the ribbon 6 becomes thick, and the crystallization of the ribbon 6 proceeds due to insufficient cooling rate. If the gap is too narrow, the ribbon 6 becomes insufficient in thickness and may be broken.

As a conventional gap meter for measuring the gap, as shown in FIG. 1, based on the amount of light emitted from a light projecting device 7 and reaching a light receiving device 8 through a gap between the nozzle 3 and the cooling roll 5. In general, a method employing an optical method for measuring the temperature is used.

Japanese Patent Publication No. Sho 60-39460 discloses that a gap is measured by irradiating a laser beam emitted from a light source and passing through a slit to a gap, and detecting the amount of light received by a photodetector. A method of adjusting the position of the cooling roll 5 to maintain the gap constant is disclosed.

[0007]

In the above-described equipment for manufacturing a rapidly solidified thin ribbon by the single roll method, the nozzle 3 is made of fine ceramics. In casting, the nozzle is not preheated due to heat resistance. Required. For this reason, even if the gap between the cooling roll 5 and the opening of the nozzle 3 is accurately set, the nozzle 3 is deformed by preheating and also by heating during casting, and the gap is changed from the set value at the start of casting or at the time of casting. It will come off. Therefore, hot gap measurement and automatic control to a predetermined value are required.

[0008] However, the gap is very small, in particular, 0.
It has been difficult with conventional optical means to measure and automatically control a gap of 3 mm or less in a high temperature environment with high accuracy. Although the cause is not fully understood, the theory based on the fluctuation of light is considered promising. As described in the above publication, it is difficult to solve this problem even if a laser beam narrowed down by a slit is used.

Therefore, the problem to be solved by the present invention is as follows:
In a facility for manufacturing a rapidly solidified ribbon such as an amorphous alloy ribbon by a single roll method, a gap meter capable of measuring a narrow gap between a surface of a cooling roll and a nozzle opening with high accuracy even in a high-temperature environment, and the gap meter. The present invention provides a method for producing a rapidly solidified ribbon using the method.

[0010]

According to the present invention, there is provided an apparatus for manufacturing a rapidly solidified thin ribbon by a single roll method, wherein a molten metal is supplied to a circumferential surface of a cooling roll and the circumferential surface. An apparatus for measuring a gap between the nozzle opening and the laser generator, a scanner that directs the laser beam to the gap and vibrates the beam in the radial direction, a calorie detector of the laser beam passing through the gap. It is a gap meter for single roll method casting characterized by comprising.

According to another aspect of the present invention, there is provided a method for producing a rapidly solidified thin ribbon by a single roll method, comprising: a cooling roll having a circumferential surface and a nozzle opening for supplying molten metal to the circumferential surface. The laser beam vibrated in the radial direction is passed through the gap between the gaps, and the gap is measured by detecting the calorific value of the laser beam that has passed therethrough, and the gap is set to a predetermined gap, and the set gap is cast. A method for producing a rapidly solidified thin ribbon, characterized by performing automatic control for maintaining the inside of the ribbon.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A gap meter according to the present invention measures a gap between a circumferential surface of a cooling roll 5 and an opening of a nozzle 3 as shown in FIG. It is characterized by comprising an apparatus, a scanner 11 and a calorific value detector. In FIG. 2, the laser generator includes a laser head 9 for emitting a laser beam and a laser head driver 10 for driving the laser beam. A calorie detector includes a calorimeter head 13 for detecting the calorie of the laser beam and an electric signal representing the calorie detected. Is converted into an energy meter 14. The electric signal of the energy meter 14 is converted into a gap value. The scanner 11 reflects the laser beam from the laser head 9 and directs the laser beam to the gap, and is driven to rotate in the direction of the arrow by the operation of the scanner driver 10 to vibrate the laser beam in the radial direction.

The heat quantity of the laser beam is not uniform in the beam diameter direction, but becomes lower as the center is higher and closer to the periphery as shown in FIG. For this reason, the detected calorie when the same gap is measured is high at the position A and low at the position B. Such a displacement of the detection position easily occurs due to thermal expansion of the nozzle 3, the cooling roll 5, and the like. Therefore, in the present invention, the laser beam is oscillated in the radial direction as described above, so that the calorific value distribution in the beam radial direction is made uniform as shown in FIG. 3A, and the detected calorie when the same gap is measured is reduced. , A, and B.

As described above, the gap meter according to the present invention detects the laser beam passing through the gap not as a light amount as in the conventional gap meter but as a heat amount.
In addition, since the laser beam is vibrated in the radial direction, highly accurate measurement can be performed after preheating the nozzle 3 or even in a high temperature environment such as during casting. The gap meter according to the present invention is applicable not only to setting the nozzle 3 in the lateral direction with respect to the cooling roll 5 as in the example of FIG. 1, but also to casting just above the cooling roll or at an arbitrary position. it can.

Next, according to the method of the present invention, the gap between the surface of the cooling roll 5 and the opening of the nozzle 3 is measured by the above-described gap meter according to the present invention and set to a predetermined gap, as in the example shown in FIG. In addition, the present invention is a method for producing a rapidly solidified thin ribbon that performs automatic control for maintaining the set gap during casting. The gap may be set after converting the detected calorific value of the laser beam into a gap value, or may be set such that the detected calorific value is a calorific value corresponding to a predetermined gap.

In the example of FIG. 2, the electric signal of the energy meter 14 is input to the controller 15 and converted to a gap value by the controller 15, and then the tundish with the nozzle 3 attached thereto is finely moved to set a predetermined gap. And control. Alternatively, the controller 15 does not convert the electric signal into the gap value, but finely moves the tundish so that the calorie meter head 13 detects the calorific value of the laser beam corresponding to the predetermined gap value, and sets the predetermined gap. Control.

In the method of the present invention, as shown in the example of FIG.
In addition to setting the nozzle 3 in the lateral direction with respect to the cooling roll 5, the present invention can be applied to a case in which the nozzle 3 is set directly above the cooling roll or at an arbitrary position for casting. According to the method of the present invention, even after the nozzle 3 is preheated or in a high-temperature environment such as during casting, a high-precision gap measurement and automatic control for maintaining a predetermined gap can provide a good thickness accuracy. A high-performance rapidly solidified ribbon can be stably obtained.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a single roll method casting equipment of the type shown in FIG. 1, a gap meter according to the present invention as shown in FIG.
A rapidly solidified ribbon was produced by the method of the present invention. The molten metal is F
e _80.5 Si _6.5 B ₁₂ C ₁ (atomic%), the ejection temperature of the molten metal is 1320 ° C. The opening of nozzle 3 is 0.7mm × 8
0mm slit shape, cooling roll 5 is Cu-0.5% Cr
The alloy was 1200 mm in diameter and 300 mm in width, and was rotated at a surface speed of 25 m / sec.

The main equipment used was a laser head 9 manufactured by Melles Griot 05LHR991 (HeNe 632.8 nm, 20 m).
W), the laser driver 10 is 05LPL915-065, the scanner 11 and the scanner driver 12 are TEM 6800 (1 kHz oscillation angle 1 °), the calorimeter head 1
3 is Ophir Japan PD300, energy meter 14
Is a laser star manufactured by Ophir Japan.

The laser output of the laser head 9 is 10 mW, the laser diameter is 0.65 mm, the distance between the laser head 9 and the center of the scanner 11 is 10 mm, the distance between the scanner 11 and the nozzle 3 is 650 mm, and the nozzle 3 and the calorimeter head. 13
Was set to 830 mm. Then, the laser beam was oscillated in the beam radial direction at a 1 kHz oscillation angle of 1 ° by the scanner 11 and the scanner driver 12.

The gap between the opening of the nozzle 3 and the cooling roll 5 was previously set to 250 μm. At this time, the calorific value of the laser detected by the calorimeter head 13 is 385 μm.
W. After preheating the nozzle, the position of the nozzle 3 was adjusted by the controller 15 so that the laser calorie detected by the calorimeter head 13 became 385 μW, and this gap value was maintained by automatic control during casting. As a result, a favorable amorphous alloy ribbon having a width of 80 mm and a thickness of about 28 μm was obtained.

[0022]

The gap meter according to the present invention is used in a facility for producing a rapidly solidified thin ribbon such as an amorphous alloy ribbon by a single roll method, while oscillating a laser beam radially in a gap between a cooling roll and a nozzle. Since the laser beam is passed and the calorie of the passed laser beam is detected, a narrow gap of 0.3 mm or less can be measured with high accuracy even after preheating the nozzle or in a high temperature environment during casting. According to the method of the present invention, a high-performance rapidly solidified ribbon with good thickness accuracy can be stably obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a single roll method as an object of the present invention.

FIG. 2 is a block diagram showing an example of the present invention.

FIG. 3 is an explanatory diagram illustrating an example of a calorific value distribution of a laser according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tundish 2 ... Molten metal 3 ... Nozzle 4 ... Tundish stopper 5 ... Cooling roll 6 ... Thin strip 7 ... Projector 8 ... Light receiver 9 ... Laser head 10 ... Laser head driver 11 ... Scanner 12 ... Scanner driver 13 ... Calorimeter Head 14 ... Energy meter 15 ... Controller

Continued on the front page (72) Inventor Toshiharu Kikuchi 3-35-1, Ida, Nakahara-ku, Kawasaki-shi, Kanagawa F-term in the Technology Development Division, Nippon Steel Corporation (reference) 2F065 AA22 FF02 GG04 HH04 HH15 JJ00 LL13 LL62 MM16 NN20 4E004 DB02 DB16 MC00 PA10 TA01 TB05 TB07

Claims (2)

[Claims] 1. An apparatus for measuring a gap between a circumferential surface of a cooling roll and a nozzle opening for supplying molten metal to the circumferential surface, in a facility for manufacturing a rapidly solidified ribbon by a single roll method, A gap for single roll casting, comprising: a laser generator, a scanner for directing a laser beam to the gap and vibrating the beam in a radial direction, and a calorie detector for the laser beam passing through the gap. Total. 2. In a facility for manufacturing a rapidly solidified thin ribbon by a single-roll method, a gap between a circumferential surface of a cooling roll and a nozzle opening for supplying molten metal to the circumferential surface is vibrated in a radial direction. The laser beam is passed, the gap is measured by detecting the calorific value of the passed laser beam, the gap is set to a predetermined gap, and automatic control for maintaining the set gap during casting is performed. A method for producing a rapidly solidified ribbon.