JP3098698B2 - Supply method of molten alloy for production of amorphous alloy ribbon - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid quenching method for rapidly solidifying a molten alloy on a moving cooling substrate to obtain a wire and a thin strip-shaped amorphous alloy (hereinafter simply referred to as a thin strip). The present invention relates to a method for supplying a molten alloy to a tundish from a ladle that holds the molten alloy.

[0002]

2. Description of the Related Art As a liquid quenching method for producing a ribbon, for example, a single roll method in which a molten alloy is supplied onto a single high-speed rotating cooling roll to obtain a ribbon, There is a twin-roll method for supplying a molten alloy between a pair of high-speed rotating cooling rolls to obtain a ribbon.

A method of forming a ribbon by the liquid quenching method will be described by taking, as an example, the case of using a single roll quenching and solidification ribbon manufacturing apparatus shown in FIG. In FIG. 5, molten alloy 6 is supplied to tundish 5 so that the level of the molten metal becomes constant. A tuyere brick 9 is provided on a bottom wall of the tundish 5, and an intermediate nozzle 10 and a nozzle holder 11 are connected to the tuyere brick 9. Holes are provided in the tuyere brick 9, the intermediate nozzle 10, and the nozzle holder 11, and these holes are connected to form the molten metal flow path 13 and the enlarged internal space 14 in the nozzle holder 11. In addition, nozzle holder-11
A nozzle tip 12 is attached to the tip of the nozzle, and a nozzle slit 15 provided inside the nozzle tip 12 is provided.
Communicates with the molten metal channel 13. The nozzle holder
The enlarged internal space 14, the nozzle tip 12, and the nozzle slit 15 in FIG. 11 are shown in FIG. 6. The enlarged internal space 14 is the molten metal flow path 13 in the nozzle holder 11 in order to obtain a wide ribbon. The nozzle slit 15 refers to an opening provided in the nozzle tip 12 for ejecting the molten metal.

[0004] By raising the tundish stopper-4, the molten alloy 6 in the tundish 5 flows out of the nozzle slit 15 toward the cooling roll 8 through the molten metal flow path 13. At this time, the flow rate of the molten alloy 6 flowing out from the nozzle slit 15 toward the cooling roll 8 is controlled according to the static pressure of the molten metal in the tundish 5. The molten alloy 6 flowing out of the nozzle slit 15 is cooled by a cooling roller.
The surface of the shell 8 is rapidly cooled to form the ribbon 7.

In FIG. 5, the cooling roll 8 is provided with a tundish 5 to facilitate understanding of the entire apparatus.
It is drawn at a scale larger than the scale of.

[0006] In either method, the liquid quenching method is used.
In order to obtain a thin ribbon, a cooling rate of, for example, 10^Two About K / sec
It is necessary to be more than degree. Therefore, the obtained thin plate
There is a limit to the thickness, and the thickness of the ribbon is 0.1 mm at most.
Full and small. Thin ribbon less than 0.1mm by liquid quenching
When manufacturing, for example, the usual solidification technology
Control of various manufacturing factors compared to
Differences occur in the conditions. Among them, it is very different
As a constraint, there is a supply amount of the molten alloy. sand
In other words, for example, continuous casting of commonly used steel, etc.
In the case of the method, the amount of the molten alloy that can be supplied to the mold is, for example,
In the case of steel, it is about several tons / min.
Can be supplied more.

On the other hand, in the liquid quenching method targeted in the present invention, the supply amount of the molten alloy is 100 kg /.
Must be considerably less than a minute. This is due to the limitation in the thickness of the ribbon, as described above. That is, for example, the maximum thickness of a ribbon that can be usually produced by a single roll method is about 0.1 mm, and the peripheral speed of the cooling roll in this case is about 10 m / sec. Since the width is at most about 200 mm at most, for example,
In the case of an alloy containing iron as a main component, the supply amount of the molten alloy must be controlled to about 90 kg / min.

When producing ribbons on an industrial scale by the liquid quenching method, it is important to reduce the supply of the molten alloy. For example, in the case of continuous casting of steel, the molten alloy is supplied from a ladle holding the molten alloy to a mold via a tundish. A method using a ladle stopper attached to a long nozzle hole at the bottom of the pan is adopted. In other words, by raising and lowering the ladle stopper,
This is to control the supply amount of the molten alloy by controlling the opening area of the long nozzle. As described above, in the case of the continuous casting method, a considerable amount of several tons / minute can be supplied. Therefore, the supply amount can be easily controlled by such a stopper system.

On the other hand, in the case of the liquid quenching method, which is the object of the present invention, the supply rate of the molten metal must be suppressed to 100 kg / min or less. Will be difficult. Therefore, as a method of employing the stopper method in the liquid quenching method, for example, a method described in Japanese Patent Application Laid-Open No. 1-35505 has been proposed. Although this method is not limited to the production of amorphous alloy ribbons, it was conceived in order to make the supply of molten alloy relatively small, and the weight of the molten alloy in the tundish during hot water supply was measured. In this method, the supply rate of the molten alloy is controlled by controlling the raising / lowering speed and position of the ladle stopper based on the measured values. This method further describes that by limiting the lower limit of the amount of rise of the ladle stopper to 2 mm and the upper limit to 6 mm, it is possible to control the supply amount of the molten alloy with considerably good accuracy.

[0010]

However, in this method, since it is necessary to measure the weight of the tundish during hot water supply, not only the control becomes complicated, but also the equipment cost is increased because the measuring device and the arithmetic device are mounted. However, it is considered that the production cost increases. In addition, ladle stopper
If the amount of rise is too small, the operation becomes difficult.
The reason for this is that even if the equipment is quite sophisticated, there is usually play in the equipment. In consideration of the backlash of the equipment, it is necessary to raise the ladle stopper at least about 5 mm.

An object of the present invention is to solve such a problem that has been present in the supply control of molten metal in the liquid quenching method by using a newly devised stopper, and to provide an easy and inexpensive thin film. An object of the present invention is to provide a method for supplying a molten alloy for manufacturing a strip.

[0012]

The gist of the present invention is as follows. That is, the long nozzle and the stopper
From the ladle that is the side that supplies the molten alloy having the, the molten alloy is received, and the molten alloy is continuously supplied to the tundish that is the side that guides the received molten alloy on the cooling substrate that moves. In the method for supplying a molten alloy for producing a line and a thin strip-shaped amorphous alloy, a long nozzle having an upper opening inner wall parallel to a vertical direction and a projection having an outer wall parallel to the vertical direction. Using a stopper provided at the tip, the overlapping portion distance (y) between the long nozzle and the stopper projection is 0.1 mm or more and 200 mm or less, and the opening area (A ₀ ) of the long nozzle is 0.5 cm ^2. Not less than 10 cm ² , so that at least one portion of the outer wall surface of the stopper-projecting portion is in contact with the inner wall surface of the opening at the top of the long nozzle, and the ladle to the tundish. This is a method for supplying a molten alloy for producing an amorphous alloy ribbon, characterized by supplying a molten alloy.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings.

FIG. 1 is a schematic diagram showing the method of the present invention.
You. That is, the molten alloy 6 held in the ladle 3
Raise the stopper-1 and tande through the long nozzle 2.
To the tissue 5. At this time, the long nozzle 2
Is that the inner wall of the upper opening is parallel to the vertical
Shape. In addition, the stopper-1
The end portion has a projection 1A, and the outer wall surface of the projection 1A is in a vertical direction.
So that it is parallel to Furthermore, long nozzle
2 and the overlapping portion distance (y) between the stopper and the projection 1A is set to 0.
1 mm or more and 200 mm or less, and open the long nozzle
0.5cm mouth area^TwoMore than 10cm^Two Below, and
At least one of the outer wall surfaces of the protrusion of the stopper-1 is
Contact the inner wall of the opening at the top of the nozzle 2
To supply molten alloy 6 from ladle 3 to tundish 5
You. At this time, raise the tundish stopper-4
The cooling roll rotating the molten alloy 6 at high speed
8 is spouted onto the thin strip 7.

The "upper part of the long nozzle" as used herein means the upper end side of the long nozzle, that is, the vicinity of the end of the long nozzle attached to the ladle, and more specifically, the upper part of the long nozzle. About 200 from the top to the bottom
The range is about mm.

The long nozzle used in the method of the present invention is limited to a shape in which the inner wall surface of the upper opening is parallel to the vertical direction. The "upper opening inner wall surface" refers to the inner wall surface of the opening indicated by 2A in the vertical sectional view of the long nozzle 2 shown in FIG. In the long nozzle 2 used in the method of the present invention, the fact that the upper inner wall surface 2A of the opening is parallel to the vertical direction means that the horizontal cross-sectional shape of the opening of the long nozzle 2 is This means that the same shape is exhibited over a range of about 200 mm from the upper end to the lower side.

The most significant feature of the method of the present invention is to use a stopper 1 having a projection 1A whose outer wall surface is parallel to the vertical direction. The fact that the outer wall surface of the projection 1A is parallel to the vertical direction means that the horizontal cross-sectional shape of the projection 1A has the same shape over the entire length.

FIG. 2 is a schematic diagram for explaining the method of the present invention. In FIG. 2, the molten alloy 6 is transferred to a tundish as a stop position of the ladle stopper 1 used in the method of the present invention. Two positions are shown: a position before the supply is started, and a position where the molten alloy 6 is being supplied. That is, the dotted line indicates the former position, and the solid line indicates the latter position. FIG. 3C shows an enlarged view of the vicinity of the fitting portion between the ladle stopper-1 and the long nozzle 2 when the ladle stopper-1 is at the position where the molten alloy is being supplied to the tundish. 3 (a) and 3 (b) show an AA 'sectional view and a BB' sectional view in FIG. 3 (c), respectively. FIG. 3 shows an example in which a ladle stopper -1 having a columnar projection 1A and a cylindrical long nozzle 2 are used.

The "distance (y) of the overlapping portion between the long nozzle 2 and the stopper-projecting portion 1A" and "the opening area (A ₀ ) of the long nozzle" referred to in the method of the present invention will be described with reference to FIG. First, the "overlap distance (y) between the long nozzle 2 and the stopper-projecting portion 1A" is shown in FIG.
The distance indicated by y in the drawing is the distance in the vertical direction of the portion where the projection 1A of the ladle stopper-1 and the long nozzle 2 are overlapping in the horizontal direction during the supply of the molten alloy. In the method of the present invention, the value of y is set to 0.1 mm or more and 200 m or more.
m or less.

Next, the "open area (A ₀ ) of the long nozzle" is the area indicated by A ₀ in FIG. 3 (b).
1 is a cross-sectional area in the horizontal direction of a space formed by the outer wall surface of the first protrusion 1A. In this figure, the space formed by the inner wall surface 2A of the opening at the upper part of the long nozzle and the outer wall surface of the projection 1A of the stopper-1 is divided into two, but the opening area (A ₀ ) of the long nozzle is This is the total cross-sectional area of the space in the horizontal direction. In the method of the present invention, the value of A ₀ is limited to 0.5 cm ² or more and 10 cm ² or less.

In the method of the present invention, the horizontal cross-sectional shape of the long nozzle and the horizontal cross-sectional shape of the protrusion of the stopper are the same within the range of the distance y.
The value of the opening area (A ₀ ) of the long nozzle shows a constant value within the range of the distance y.

In the method of the present invention, the molten alloy 6 is transferred from the ladle 3 to the tundish 5 such that at least one portion of the outer wall surface of the projection of the stopper contacts the inner wall surface of the opening above the long nozzle. Here, "the outer wall surface of the protrusion of the stopper comes into contact with the inner wall surface of the opening at the top of the long nozzle" indicates a state as shown in FIG. 3B, for example. That is, in FIG. 3B, two locations on the outer wall surface of the projection 1A of the stopper-1 are in contact with the inner wall surface 2A of the opening above the long nozzle 2 at two locations (the vertical position of the projection 1A in the figure). The case is shown as an example,
"The outer wall surface of the projection of the stopper comes into contact with the inner wall surface of the opening above the long nozzle" refers to such a state. By bringing the outer wall of the protrusion of the stopper into contact with the inner wall of the opening at the top of the long nozzle, the alignment of the long nozzle and the stopper is facilitated. Supply becomes easier.

Next, in the method of the present invention, the overlap distance (y) between the long nozzle 2 and the stopper-projecting portion 1A is 0.1 mm or more and 200 mm or less, and the opening area (A ₀ ) of the long nozzle is 0.1 mm or less. It will be explained reasons for limiting the 5cm ² more than 10cm ² below.

The inventor of the present invention used a conventional stopper as shown in FIGS. 7A and 7B, for example, to reduce the area of the long nozzle opening at the tip of the stopper, thereby reducing the melting point. Experiments and examinations were conducted to clarify the relationship between the long nozzle opening area and the flow rate of the molten alloy in the conventional method of reducing the flow rate of the alloy.
In this experiment, an Fe-B-Si-C amorphous alloy was mainly used. As a result, it became clear that in order to reduce the flow rate of the molten alloy to 100 kg / min or less by the conventional method, it is necessary to reduce the opening area of the long nozzle to, for example, 1.2 cm ² or less. Heretofore, it was thought that such a small cross-sectional area would cause clogging of the molten alloy, causing so-called nozzle clogging, but this result exceeds conventional common sense.

In order to reduce the opening area of the long nozzle by using the conventional stopper, for example, as shown in FIG.
Even if a stopper with a narrowed tip as shown in FIG. 1B is used, the amount of rise of the stopper must be a very small value of 2 mm or less. The amount of rise of the stopper referred to herein is, for example, a stroke amount at the time of opening the stopper when supplying the molten alloy at a distance indicated by Ls in FIG. 2 (hereinafter, referred to as a stopper stroke). ). As described above, even if the equipment is quite sophisticated, there is usually play in the equipment. Considering the play of this equipment, it is very difficult to stably reduce the stopper stroke to 2 mm or less every time in actual operation. is there. In consideration of the play of the equipment, it is preferable that the stopper stroke is at least about 5 mm.

Therefore, the present inventors have found that even if the stopper stroke is set to 5 mm or more, the flow rate of the molten alloy is set to 100 k.
A study was conducted on the method of supplying the molten alloy so as to make it equal to or less than g / min. As described above, a long nozzle having a shape such that the inner wall surface of the upper opening was parallel to the vertical direction, and a protrusion at the tip If the stopper has a shape such that the outer wall surface of the projection is parallel to the vertical direction, the long nozzle opening area can be kept constant even if the stopper stroke is enlarged. Therefore, if the value of y shown in FIG. 3 is increased to some extent, the long nozzle opening area becomes 1.2c.
It was found that the supply amount of the molten alloy can be reduced to 100 kg / min or less even if it exceeds m ² . Further, if the values of y and A ₀ shown in FIG. 3 are respectively 0.1 mm or more and 200 mm or less, and 0.5 cm ² or more and 10 cm ² or less, even if the stopper stroke is 5 mm or more, the supply amount of the molten alloy Has been found to be less than 100 kg / min. This is because, in the method of the present invention, the value of the overlap distance (y) between the long nozzle and the projection of the stopper is 0.1 mm or more and 200 mm or less, and the long nozzle opening area (A ₀ ) is 0.5 cm ² or more and 10 cm ² or less. This is the reason for the limitation.

The overlap distance (y) between the long nozzle and the projection of the stopper and the long nozzle opening area (A ₀ )
Although a preferred combination of the values is specifically shown in Examples, basically, when the value of A ₀ is reduced within the above range, the value of y can be reduced within the above range, and a predetermined molten alloy What is necessary is just to select appropriately both values according to the supply amount. However, if the value of A ₀ is less than 0.5 cm ² , nozzle clogging may occur even for an amorphous alloy. Therefore, the value of A ₀ is limited to 0.5 cm ² or more in the method of the present invention.

On the other hand, the reason why the upper limit of the value of A ₀ is set to 10 cm ² is that the upper limit of the value of y is set. The reason why the upper limit is set for the value of y is that if the value of y becomes too large, problems occur in mounting the stopper, opening and closing work, and the like. From these points, the value of y is limited to 200 mm or less. If the value of y exceeds 200 mm, it will be difficult to center the long nozzle, and it will be difficult to install the stopper. If the centering of the stopper and the long nozzle becomes poor, the opening and closing work of the stopper will be smooth. It is not preferable because it does not proceed. When the value of y is 200 mm, the value of A ₀ can be increased to 10 cm ² . This is the reason why the upper limit of the value of A ₀ is set to 10 cm ² .

The upper limit of the limited range of the value of y is 200 mm
As described above, the reason why the lower limit is set to 0.1 mm is a limitation provided for convenience so that the predetermined value of A ₀ can be set stably.

The length of the projection of the stopper used in the method of the present invention is preferably more than 5 mm. Because the stopper stroke must be at least 5 m as described above.
This is because it is necessary to set m.

The values of “y” and A ₀ , which have reached the present invention, are 0.1 mm or more and 200 mm or less, respectively.
If it is not less than m ^{2 and not} more than 10 cm ² , the supply amount of the molten alloy is 100 kg even if the stopper stroke is not less than 5 mm.
/ Min or less. "
This phenomenon was observed in an experiment using a B-Si-C alloy. This phenomenon was caused by the fact that the viscosity of the amorphous alloy in the molten state was much smaller than that of a normal crystalline alloy. The present invention can be widely applied to various amorphous alloys because it can be determined that the phenomenon can occur widely in an amorphous alloy, not limited to the -Si-C amorphous alloy.

According to the method of the present invention, once the ladle stopper is raised during the supply of the molten alloy, the flow rate of the molten alloy is kept at 100 k even if the position of the ladle stopper is fixed.
It is also possible to supply at a constant supply rate of g / min or less. That is, it is not necessary to raise and lower the position of the ladle stopper in order to control the flow rate of the molten alloy as in the related art, so that the operation is easy, and since there is no need to use a complicated device, the molten alloy can be produced at low cost. Can supply.

However, in the present invention, when the surface level of the tundish is influenced by the surface level of the tundish due to the decrease of the surface level in the ladle, and the surface level of the tundish fluctuates at all, For example, a dummy volume may be inserted into a tundish, and the dummy volume may be moved up and down in accordance with the level change to eliminate the level change of the tundish. This is because a change in the surface level of the tundish immediately causes a change in the injection pressure of the molten alloy to be injected into the cooling roll, thereby causing a change in the thickness of the resulting ribbon. Generally, a ribbon having a large thickness variation causes a problem when used as an industrial material. Since the method of inserting the dummy volume into the tundish to make the surface level of the tundish constant is an inexpensive method, the manufacturing cost of the ribbon is not increased so much.

Although the present invention does not particularly limit the stopper stroke of the ladle stopper at the start of the supply of the molten alloy, it is not preferable to set the stopper stroke to a very small value in consideration of the play of the apparatus. It is preferable that the range of the arc is, for example, about 5 mm or more and about 50 mm or less.

The stopper used in the method of the present invention
The sectional shape of the projection is not particularly limited. FIG. 4 shows an example in which the shape of the protrusion of the stopper is changed.
(A) and (b) are respectively AA ′ in FIG.
FIGS. 4A and 4B are a cross-sectional view and a BB ′ cross-sectional view, in which the shape of the protrusion of the stopper is, for example, a flower shape as shown in FIG. May be in contact with the inner wall surface of the upper opening. However, as shown in FIG. 4A, the shape of the fitting portion between the stopper and the long nozzle needs to be the same as the shape of the opening of the long nozzle. Further, the tip of the projection 1A of the stopper-1 may be rounded as shown in FIG. However, the value of y in this case is shown in FIG.
The distance shown in FIG.

FIG. 3 shows an example in which a cylindrical long nozzle is used, but in the method of the present invention,
The shape of the long nozzle used is not particularly limited to a cylindrical shape. That is, the cross-sectional shape of the long nozzle may be a circular shape, an elliptical shape, a flower shape, or a polygonal shape.
Further, the long nozzle opening shape may be different between the upper portion and the lower portion.

The basic ribbon manufacturing apparatus employed in the present invention is, as described above, a liquid quenching apparatus in which molten metal is jetted through a nozzle onto a cooling substrate and rapidly solidified by thermal contact. Among them, a single roll device and a twin roll device. Single-roll devices include a centrifugal quenching device that uses the inner wall of the drum, a device that uses an endless type belt,
These include improved versions, for example with auxiliary rolls, with roll surface temperature control, or casting under reduced pressure or in vacuum or in an inert gas.

Next, the casting conditions employed in the method of the present invention and specific casting operations will be described. The injection pressure of the molten metal is set at 0.01 to 3 kg / cm ² mainly using the level of the molten metal in the tundish. Cooling row
The rotational speed (surface speed) of the shell is in the range of 5 to 60 m / sec. For these conditions, optimal values are selected according to the type of alloy to be used, the thickness of the target ribbon, and other manufacturing conditions.

[0039]

【Example】

(Example 1) Tanro as shown in Figure 1 - with Le spinning _{apparatus, Fe-B 12 -Si 6.5 -C} 1 ( atomic%) was produced alloy ribbons. For melting of the alloy, a ladle with a ladle stopper and a long nozzle as shown in FIG. 1 was used.
The long nozzle used is made of alumina graphite.
The cylindrical shape is as shown in the figure, and its size is 4
0 mm, the inner diameter of the lowermost part was 25 mm, and the length was 1 m.
The inner diameter was constant for 200 mm from the uppermost part to the lower part, and the lower part had a constant taper. The long nozzle has an outer diameter of 20 from the top to the bottom.
0 mm was 60 mm, and the lowermost part was 40 mm. In addition, it is made of alumina graphite as a ladle stopper,
As shown in FIG. 3, a stopper having a cylindrical shape having a length of 900 mm and an outer diameter of 100 mm and having an elliptical protrusion having a length of 60 mm at the tip was used. The major axis of the elliptical projection was set to 40 mm, and the dimensions were such that the two locations at both ends of the major axis slightly contact the inner wall surface of the upper opening of the long nozzle. In addition, three types of ladle stoppers were used, and the minor diameter of the elliptical shape of the projection at the tip was changed.

The melting of the alloy was performed by a high-frequency induction method, and the level of the molten metal in the ladle before starting the supply of the molten alloy to the tundish was 250 mm. The casting experiment was performed three times, one charge for each of the three types of ladle stoppers. The values of y and A ₀ shown in FIG. 3 and the value of the stopper stroke (Ls) of the ladle stopper are shown in Table 1 as conditions in each casting experiment. The other ribbon production conditions were as follows.

Temperature of molten alloy in ladle during pouring: 1350 ° C. Nozzle opening shape: An opening in which two rectangular slits of 120 mm × 0.7 mm are arranged at 1.5 mm intervals Surface speed of cooling roll during casting : 24 m / s Gap between nozzle and cooling roll: 0.25 mm As a result, the width is approximately 1 in all the chargers.
A ribbon having good properties of 20 mm was obtained. From the obtained ribbon, at five positions at equal intervals in the longitudinal direction,
Samples each having a length of 24 m were collected, and the weight of each sample was measured. Since this weight indicates the weight of the molten alloy supplied per second, the supply amount of the molten alloy during casting was calculated from this data. Table 1 shows the minimum and maximum values as a result. As can be seen from this value, the value of the supply amount of the molten alloy in each charge was substantially constant for each charge. The thickness of each of the 24 m samples was measured. Table 1 also shows the minimum and maximum values of the obtained plate thickness. No significant variation was observed in the thickness of the ribbon in each of the chargers. From this data, it can be seen that there was no problematic variation in the supply of the molten alloy in all the chargers. Further, the obtained ribbon was a ribbon having good magnetic properties and mechanical properties.

From the above results, it can be seen that the supply rate of the molten alloy was 100 kg / min or less and that the molten alloy was supplied almost uniformly during casting by such a supply method of the molten alloy.

[0043]

[Table 1] Example 2 A ribbon production experiment was performed using the same ribbon production apparatus as in Example 1. Example 1 used long nozzle
The same as in the case of On the other hand, the ladle stopper had a cylindrical shape with a length of 900 mm and an outer diameter of 60 mm, and had a flower-shaped protrusion at the tip as shown in FIG. The values of y and A ₀ shown in FIG. 4 were 13 mm and 1.5 cm ² , respectively. The other casting conditions were the same as in Example 1.

As a result, a ribbon having good properties and a width of about 120 mm was obtained. Sampling was performed from the obtained ribbon in the same manner as in Example 1, and the supply amount of the molten alloy and the thickness of the ribbon were investigated. As a result, the supply amount of the molten alloy was 62 to 64 kg / min, and the thickness of the ribbon was 49 to 52 μm. From these data, almost no fluctuation was observed in the supply amount of the molten alloy, and consequently, there was no fluctuation that would cause a problem in the thickness of the ribbon.

From the above results, it can be understood that the supply rate of the molten alloy was 100 kg / min or less, and that the molten alloy was supplied almost uniformly during casting by such a method of supplying the molten alloy.

[0046]

As described above, according to the present invention, when a molten alloy is supplied from a ladle to a tundish in a liquid quenching method such as a single roll method, 100 kg is easily and inexpensively prepared. 1 / min or less and uniform supply at a small supply rate of less than / min. Furthermore, by bringing the stopper into contact with a part of the long nozzle, the centering of the stopper and the long nozzle has become easier. As a result, good ribbons can be easily and inexpensively produced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a method of the present invention.

FIG. 2 is a schematic diagram illustrating the method of the present invention.

FIG. 3 is a schematic view showing an example of a ladle stopper and a long nozzle used in the method of the present invention.

FIG. 4 is a schematic view showing an example of a ladle stopper and a long nozzle used in the method of the present invention.

FIG. 5 is a schematic view for explaining a state of casting using a single-roll quenched and solidified ribbon manufacturing apparatus.

FIG. 6 is an enlarged schematic diagram for explaining a state of casting using a single-roll quenched and solidified ribbon manufacturing apparatus.

FIG. 7 is a schematic view showing the shape of a conventionally used ladle stopper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ladle stopper 1A Projection part 2 Long nozzle 2A Opening inner wall surface 3 Ladle 4 Tundish stopper 5 Tundish 6 Molten alloy 7 Thin strip 8 Cooling roll 9 Tuyere brick 10 Intermediate nozzle 11 Nozzle holder 12 Nozzle Tip 13 Molten flow path 14 Expanded internal space 15 Nozzle slit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-34550 (JP, A) JP-A-4-262855 (JP, A) JP-A 64-2769 (JP, A) 264256 (JP, A) JP-A-9-174205 (JP, A) JP-A-57-68250 (JP, A) JP-A-1-166681 (JP, A) JP-A-57-41850 (JP, A) JP-A-3-268847 (JP, A) JP-A-63-150752 (JP, U) JP-A-63-150751 (JP, U) JP-A-57-106749 (JP, U) Registered utility model 3019445 (JP, U.S.A.) , U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B22D 11/06 360 B22D 11/06 380 B22D 11/10 310 B22D 11/10 320 B22D 11/103

Claims (1)

(57) [Claims] 1. A tundish that receives a molten alloy from a ladle that supplies a molten alloy having a long nozzle and a stopper and guides the received molten alloy onto a moving cooling substrate. In a method for supplying a molten alloy by continuously supplying a molten alloy to a wire and a thin strip-shaped amorphous alloy, a long nozzle and an outer wall having an upper opening inner wall surface parallel to a vertical direction are provided. The long nozzle and the stopper are provided by using a stopper provided at the tip with a protrusion parallel to the vertical direction.
The overlap distance (y) of the protrusions is 0.1 mm or more and 200 m.
m or less, and the opening area (A ₀ ) of the long nozzle is set to 0.
5 cm ² or more and 10 cm ² or less, the stopper - characterized in that as at least one portion of the outer wall surface of the protrusion is in contact with the opening inner wall surface of the long nozzle top, to supply the molten alloy from a ladle to a tundish A molten alloy supply method for producing an amorphous alloy ribbon.