JPH066225B2 - Single roll type melt quencher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a field of directly making a plate from a molten metal by a cooling roll, for example, a single-roll type molten metal for producing a case ribbon, an amorphous ribbon, a quenched thin wire and the like. It relates to a quenching device.

<Prior art> The technological development for directly making a plate by the quenching method has been activated in recent years. Among them, the method by the single roll method is as shown in Fig. 4 and the melt spinning method. There are various melt-drag methods.

In these methods, since the gap between the pouring nozzle tip and the cooling roll, the nozzle rotation angle, the nozzle offset amount, and the like have a great influence on the quality of the plate-making result, high-precision control is required. For example, when manufacturing amorphous metal by the melt spinning method, the gap between the nozzle and the cooling roll is ± 10.
Control accuracy of about 30 μm is required. Similarly, the nozzle rotation angle and the nozzle offset amount are required to have the same level of accuracy.

In the prior art, for example, the gap control method between the nozzle and the cooling roll at the time of preheating and pouring in JP-A-58-132356,
JP-A-59-183957 and JP-A-53-130205 disclose optimization of the nozzle rotation angle, and JP-A-61-103652 discloses a method for controlling the gap between the width direction nozzle and the cooling roll. However, the actual situation is that a device having a structure and controllability sufficient to control the attitude of the nozzle that works three-dimensionally has not been disclosed.

<Problems to be Solved by the Invention> As described above, control of the gap between the nozzle tip and the cooling roll, the nozzle rotation angle, and the nozzle offset amount is the most important issue in the single roll method. These controls must be able to handle not only presets during manufacturing setup but also nozzle deformation that occurs during nozzle preheating and pouring, thermal expansion of the cooling roll, and the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made in order to provide an apparatus having a mechanism and controllability that satisfy the above requirements.

<Means for Solving the Problems> The present invention relates to a single roll type molten metal quenching apparatus for directly producing a metal ribbon and a metal wire by injecting the molten metal from a pouring nozzle onto the surface of a rotating cooling roll. Nozzle moving means and means for detecting the amount of movement thereof, and a device for detecting the gap between the nozzle and the cooling roll described below, and based on the value detected by any one or more of the detecting means, The single roll molten metal quenching apparatus is characterized by comprising a control means for controlling the nozzle position by moving the nozzle by one or more of the nozzle moving means.

At the both ends of the cooling roll axial direction of the nozzle, independently, the moving means of the nozzle parallel to the cooling roll upper end tangential direction at the molten metal injection position, the moving amount detecting means, the both ends of the cooling roll axial direction of the nozzle, Independently, a nozzle moving means parallel to the molten metal injection direction, a means for detecting the amount of movement, and a nozzle rotating means that independently rotates with respect to the molten metal injection direction at both ends of the nozzle in the cooling roll axial direction, A means for detecting the nozzle rotation angle, and an optical means for detecting the gap between the nozzle and the cooling roll at both ends of the nozzle in the axial direction of the cooling roll.

<Operation> Figure 4 shows the melt spinning method. Nozzle 2
The molten metal poured from the above forms a molten metal paddle 3 with the cooling roll 1 and rapidly solidifies into a ribbon. At this time, the positional relationship between the nozzle 2 and the cooling roll 1 is defined by the gap H between the nozzle and the cooling roll, the nozzle offset amount (deviation from the cooling roll axis) m, and the nozzle rotation angle α. Since the nozzle has a width, the above relationship holds for the gap H and the offset amount m at the two positions on the left and right in the width direction.

FIG. 5 shows the melt drag method. Also in this case, the nozzle positional relationship exactly the same as in the melt spinning method of FIG. 4 can be discussed. FIG. 1 is a perspective view of an apparatus according to the present invention.

As a control of the gap H between the nozzle and the cooling roll, an elevating frame 8 is assembled to the girder so as to surround the tundish 17 to which the pouring nozzle 2 is attached, and each elevating mechanism is provided on both left and right sides in the nozzle width direction. There is. This lifting mechanism is a drive motor 4
a, worm jacks 6a and 6b for distributing the driving force in the ascending / descending direction, and a pulse generator 5 for measuring the ascending / descending amount
a, a fixed frame 9a for mounting them, and elevating guides 10a, 10b. Similarly, a drive system is provided on the opposite side in the width direction, and the gap H between the tip of the nozzle 2 and the cooling roll 1 can be independently controlled in the width direction.

The nozzle offset amount m can be controlled by forming windows on the left and right in the width direction of the lifting frame 8 and providing rotary shaft bearings 16 for traveling therethrough, and driving them. The tundish 17 is used for the bearing 16 running in the window.
There is provided a rotating shaft 18 for supporting.

One end of the bearing 16 is connected to the worm screw 15, and the worm jack 14a is driven by the traveling motor 12a. Further, this movement is measured by the pulse generator 13a. The opposite side in the width direction has a completely similar drive system,
Each of them independently moves, and the offset amount m and the offset difference in the width direction can be controlled. All of these drive systems are frame 8
It is placed on top.

The nozzle rotation angle α can be controlled by rotating the tundish rotation shaft 18 attached to the traveling bearing 16 by the rotation motor 19. The drive amount is measured by the pulse generator 20. This drive system is entirely mounted on the rotary shaft bearing 16.

The measurement of the gap H between the nozzle and the cooling roll is performed by an optical gap measuring instrument including a measuring optical system light projector 21 and a light receiver 22.

The measurement light beam 23 emitted from the measurement optical system projector 21 is
The gap H between the nozzle and the cooling roll can be accurately measured by the light beam selected by passing through the gap formed by the tip of the nozzle 2 and the cooling roll 1 and entering the light receiver 22.
This device is arranged symmetrically in the nozzle width direction.

The movements of the apparatus configured as described above have the relationship shown in FIG.

When the rotation axis 18 of the tundish 17 and the radius of rotation to the tip of the nozzle 2 are 1, and the bottom surface of the tip of the nozzle 2 and the tangent line of the top end of the cooling roll 1 are parallel, the center of the lip 2a of the nozzle rotates. The angle between the straight line connecting the shaft 18 and the straight line connecting the rotating shaft 18 of the lip 2a of the nozzle and the cooling roll shaft core is β, the nozzle 2 and the center, the rotating shaft of the nozzle 2 and the cooling roll shaft core are The distance from the straight line connecting the lines is m, the distance is H ₀ , and the nozzle lip thickness (1/2 of the nozzle thickness) is t. When the nozzle rotation angle α is rotated from such a position, the gap H between the nozzle and the cooling roll is reduced to the nozzle lip 2
It is the sum of the difference between the moving amount H ₁ of the center of a and the moving amount H ₂ due to the rotation of the nozzle lip 2a and the initial gap H ₀ .

This relationship is expressed by the following equation.

_{H = H 1 -H 2 + H} 0 = l (cosβ-cos | α + β |) - tsin | α | + H 2 When the relationship among the nozzle rotation angle α, the gap H between the nozzle and the cooling roll, and the offset amount m is calculated from this equation, the result shown in FIG. 3 is obtained. When the offset amount m = 0, if the nozzle rotation angle α is increased or decreased, a symmetrical curve is drawn.
At this time, the parallelism between the bottom surface of the lip of the nozzle and the cooling roll 1 can be known by having the pole at the position of α = 0. Also, the gap H ₀ at this time can be known.

Further, when the offset amount m is m> 0, the curve is not symmetrical to the left and right, and is a curve inclined to one side. The offset amount m is calculated from the amount of this inclination.

As described above, according to the apparatus mechanism of the present invention, it is possible to estimate the rotation angle and the offset amount of the nozzle only by measuring the gap between the nozzle and the cooling roll, and take in these data to control each drive system. This makes it possible to easily move the nozzle to the target position. In addition, all of these can be measured and controlled in a non-contact manner, and not only presetting during setup before pouring but also control during preheating of nozzles and tundish and during pouring can be performed, and nozzles and rolls can be controlled by heat. Deformations can also be accommodated online.

<Example> By the melt spinning method, the component Fe-B-Si = 78-13
When manufacturing -9 (wt%) amorphous alloy ribbon under the following conditions, cooling roll peripheral speed = 17 m / sec, nozzle width = 100 mm, output steel temperature = 1310 ° C, nozzle preheating temperature = 1000 ° C. .

Measure the gap between the nozzle and the cooling roll during nozzle preheating,
It was found that the nozzle was in the posture shown by the circle in FIG. That is, the nozzle rotation angle = -2 °, the gap between the nozzle and the cooling roll is -40 μm from the reference gap, and the offset amount =
Since it is 3 mm, the target value for the nozzle attitude control device is set to the nozzle rotation angle = 0 °, the gap between the nozzle and the cooling roll = 0 μm,
As a result of driving with an offset amount of 0 mm, it was possible to return to the origin ● in Fig. 3.

As a result of starting the pouring in such a state, there was no paddle break, and it was possible to obtain a target strip with a plate thickness of 20 μm and good surface quality.

Further, even when the manufacturing was continued, even if there was a nozzle deformation or a disturbance due to the crown of the cooling roll, it could be stably maintained at the origin point ● in FIG.

As a comparative example, under the same manufacturing conditions, it was set at the origin ● mark position in Fig. 3 immediately before the start of pouring, but when the nozzle attitude control device is not used, it is set at the position of □ mark 20 seconds after the start of pouring. The gap between the nozzle on one side and the cooling roll moved, and from that time, a hole began to appear in the ribbon at that portion.

<Effects of the Invention> By using the apparatus according to the present invention, the gap between the nozzle and the cooling roll, the nozzle rotation angle, and the nozzle offset amount can be controlled with high precision, and a good ribbon can be stably manufactured. It will be possible.

[Brief description of drawings]

FIG. 1 is a perspective view of a single roll type molten metal quenching apparatus according to the present invention, FIG. 2 is an explanatory view showing a positional relationship between nozzles and cooling rolls, and FIG. 3 is a positional relationship between nozzles and cooling rolls. Fig. 4 is a characteristic diagram showing the calculation results and actual measurement results of
FIG. 5 is a schematic explanatory diagram of the melt spinning method, and FIG. 5 is a schematic explanatory diagram of the melt drag method. DESCRIPTION OF SYMBOLS 1 ... Cooling roll, 2 ... Nozzle, 2a ... Nozzle lip, 3 ... Molten paddle, 4 ... Tundish raising / lowering motor, 5 ... Tundish raising / lowering amount measuring pulse generator, 6 ... Tundish raising / lowering warm jack, 7 ... Warm jack for lifting tundish, 8 ... Tundish lifting frame, 9 ... Fixed frame, 10 ... Tundish lifting guide, 11 ... Tundish lifting guide, 12 ... Tundish running motor, 13 ... Tundish running amount measurement Pulse generator, 14… Tundish running worm jack, 15… Tundish running worm screw, 16… Rotating shaft bearing, 17… Tundish, 18… Tundish rotating shaft, 19… Tundish rotating motor, 20… Tan Pulse generator for measuring dish rotation angle, 21… Optics for emitter measurement, 22 ... measuring optical system photodetector, 23 ... measuring light beam, 24 ... inflection point when the nozzle rotation angle alpha, the gap between the H ... nozzle and the cooling roll, H 0 _... nozzle rotating H when the angle is 0, H ₁ ... Amount of increase in the gap when the nozzle rotation angle is rotated α, H ₂ ... Amount of movement of the nozzle lip when the nozzle rotation angle is rotated α, m ... Nozzle offset amount, α ... nozzle rotation angle, t ... nozzle lip thickness, β ... offset angle, l ... nozzle rotation radius.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masanori Nara 1 Kawasaki-cho, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Technical Research Division

Claims (1)

[Claims] 1. A single roll type molten metal quenching device for directly producing a metal ribbon and a metal wire by injecting a molten metal from a pouring nozzle onto a surface of a rotating cooling roll, the following nozzle moving means and its moving amount: And a device for detecting the gap between the nozzle and the cooling roll described below, and based on the detection value of any one or more of the ,, and, any one or more of the and A single roll type molten metal quenching apparatus comprising a control means for controlling the nozzle position by moving the nozzle by means of the nozzle moving means. At the both ends of the cooling roll axial direction of the nozzle, independently, the moving means of the nozzle parallel to the cooling roll upper end tangential direction at the molten metal injection position, the moving amount detecting means, the both ends of the cooling roll axial direction of the nozzle, Independently, a nozzle moving means parallel to the molten metal injection direction, a means for detecting the amount of movement, and a nozzle rotating means that independently rotates with respect to the molten metal injection direction at both ends of the nozzle in the cooling roll axial direction, A means for detecting the nozzle rotation angle, and an optical means for detecting the gap between the nozzle and the cooling roll at both ends of the nozzle in the axial direction of the cooling roll.