JPH081285A - Nozzle for producing amorphous thin metal strip - Google Patents

Abstract

PURPOSE:To reduce the influence of air stream accompanied with the cooling roll rotated at high speed and to produce an amorphous thin metal strip having excellent surface condition by providing a flowing groove for flowing the air stream in the width direction of a nozzle at the upper part from the lower surface of a refractory. CONSTITUTION:This nozzle 3 for producing the amorphous thin metal strip 7 consists of an injection silt 8 for supplying molten metal 1 from a tundish onto the surface of the cooling roll 2 rotated at the high speed to form a well part (paddle) 4 therein and a refractory 10 surrounding this injection slit. The flowing groove 9 for flowing the air stream 5 accompanied with the cooling roll 2 rotated at the high speed is provided at the upper part from the lower surface of this refractory 10 in the width direction of the nozzle in the refractory 10. Major part of the air stream 5 generated by this cooling roll 2 is allowed to be flowed in the width direction of the nozzle 3 before the air stream is collided with the paddle 4. In this result, the vibration generated in the paddle 4 and the trapping of gas are reduced and the thin strip excellent in surface condition is produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing an amorphous metal ribbon, and more particularly, to injecting a molten metal onto the surface of a chill roll under high speed rotation to rapidly solidify the amorphous metal. It relates to the shape of a nozzle for jetting molten metal used when manufacturing a ribbon.

[0002]

2. Description of the Related Art As a method for producing an amorphous metal ribbon, a molten metal is sprayed through a nozzle onto the surface of a chill roll under high speed rotation, and there is a pool (hereinafter referred to as a paddle).
In general, the molten metal flowing from the paddle onto the surface of the cooling roll in the rotating direction is rapidly cooled and solidified by the heat removal action of the cooling roll. And, as the above-mentioned nozzle, a round one hole type was used before, but even if the hole size is increased, only a thin strip with a maximum width of about 2 mm can be manufactured, or the surface condition in the width direction of the thin strip. However, there was a problem that a good quality product could not be obtained.

Therefore, many studies have been conducted on the shape of the nozzle, for example, Japanese Patent Laid-Open No. 53-1335.
A "nozzle having a plurality of nozzle holes" disclosed in Japanese Patent No. 31 or a "nozzle having a rectangular cross section of a multi-hole nozzle" disclosed in Japanese Patent Laid-Open No. 57-171550 is proposed. At present, it has been improved one step further, and it has become possible to manufacture a wide ribbon (for example, 200 mm or more), a long ribbon having a relatively good surface condition by using a one-hole nozzle having a rectangular cross section.

[0004]

However, although the nozzle described in the above-mentioned prior art is effective in reducing the plate thickness deviation in the width direction of the ribbon, it is not yet sufficiently satisfied with respect to the surface condition. The reason for this is that the cooling roll is rotating at a high speed, which causes a rotating airflow (mainly air). That is, when the accompanying airflow collides with the paddle, the paddle vibrates, there is an airflow trapped on the surface of the ribbon, and there is a problem that the surface condition of the ribbon is not improved yet. Of.

In view of the above circumstances, the present invention aims to provide a nozzle capable of reducing the influence of an entrained air flow generated by high-speed rotation of a cooling roll and producing an amorphous metal ribbon having an excellent surface condition. I am trying.

[0006]

In order to solve the above-mentioned problems, the inventor diligently researched a method of preventing the entrained airflow of the cooling roll from reaching the paddle as much as possible.
The present invention embodies the research results, and supplies molten metal from a tundish onto a surface of a cooling roll that rotates at a high speed, and an injection slit that forms a pool of the molten metal, and a fire-resistant surrounding the injection slit. In a nozzle for producing an amorphous metal ribbon made of a material, a circulation groove for flowing a circulating air stream of the cooling roll that rotates at a high speed is provided in the refractory material, above the lower surface of the refractory material, and in the nozzle. A nozzle for producing an amorphous metal ribbon, which is provided in the width direction. Further, according to the present invention, the flow groove is provided parallel to the vertical surface of the refractory material on the upstream side in the rotation direction of the cooling roll with respect to the injection slit, and the amorphous metal ribbon according to claim 1. It is a manufacturing nozzle, the flow groove, in the refractory material on the upstream side of the cooling slit rotation direction from the injection slit, in a plane with respect to the downstream side of the cooling roll rotation direction (hereinafter, The nozzle for producing an amorphous metal ribbon according to claim 1, characterized in that the nozzle has a shape which is simply bent in a V shape. Further, the present invention provides an amorphous metal thin film consisting of an injection slit for supplying molten metal from a tundish onto the surface of a cooling roll that rotates at a high speed and forming a pool of molten metal therein, and a refractory material surrounding the injection slit. In the nozzle for manufacturing a belt, the injection slit is bent at a central portion in a V shape with respect to the downstream side in the rotation direction of the cooling roll, and on the cooling roll through which the accompanying air current of the cooling roll rotating at high speed passes. It is a nozzle for producing an amorphous metal ribbon characterized by widening the area, or in the refractory material on the upstream side in the cooling roll rotation direction from the injection slit, with respect to the downstream side in the cooling roll rotation direction. 5. The amorphous material according to claim 4, wherein a circulation groove, which has a V-shape, is provided in the nozzle width direction above the lower surface of the refractory material, and a circulation groove for flowing the accompanying airflow of the high-speed rotating cooling roll. A production for the nozzle of the metal strip may be. For actual nozzle fabrication, the present invention is characterized in that the dogleg shape is bent at its central portion and both sides of the bending point are straight lines. Conveniently, it is a nozzle for producing an amorphous metal ribbon according to any one of 1.

[0007]

In the present invention, the amorphous metal is composed of the injection slit for supplying the molten metal from the tundish onto the surface of the cooling roll which rotates at a high speed and forming the pool of the molten metal, and the refractory material surrounding the injection slit. In thin strip manufacturing nozzles,
A circulation groove for flowing an accompanying airflow of the cooling roll rotating at a high speed, in the refractory material, above the lower surface of the refractory material,
Further, since the cooling roll is provided in the width direction of the nozzle, most of the accompanying airflow generated by the cooling roll flows in the width direction of the nozzle before colliding with the paddle. As a result, vibrations and gas traps generated in the paddle are reduced, and a ribbon having an excellent surface condition is manufactured. The reason why the amount of the accompanying airflow impinging on the paddle is reduced is that the distance between the cooling roll surface and the lower surface of the nozzle refractory material is as narrow as 0.1 mm or less, but by providing a wide space there, the airflow can be increased in the roll rotation direction. This is because the passage resistance of is increased.

Further, according to the present invention, the flow groove is provided in parallel with the vertical surface of the refractory material on the upstream side of the injection slit in the direction of rotation of the cooling roll, and the amorphous metal according to claim 1. A thin strip manufacturing nozzle, wherein the flow groove is bent in a dogleg to the refractory material on the upstream side in the cooling roll rotation direction from the injection slit, with respect to the downstream side in the cooling roll rotation direction. With the nozzle for producing an amorphous metal ribbon according to claim 1, which has a shape, the above effect can be further promoted.

Further, according to the present invention, the molten metal from the tundish is supplied onto the surface of the chill roll that rotates at a high speed, and an injection slit for forming a pool of the molten metal and a refractory material surrounding the injection slit are amorphous. In a nozzle for producing a thin metal ribbon, the injection slit is bent at a central portion in a dogleg to the downstream side in the rotation direction of the cooling roll, and the cooling air is passed along with the accompanying rotating airflow of the cooling roll rotating at high speed. A nozzle for producing an amorphous metal ribbon characterized by widening the area on a roll, or in a refractory material on the upstream side in the rotation direction of the cooling roll from the injection slit, and in the downstream side in the rotation direction of the cooling roll. 7. A flow groove, which has a dogleg shape with respect to the side, is provided in the nozzle width direction above the lower surface of the refractory material so as to flow a circulation airflow along with the high-speed rotating cooling roll. With manufacturing nozzles of amorphous metal ribbon, wherein said collision airflow shape of the paddle itself is easily escape to the paddle end direction, and to be able to achieve the same effect as the invention. Further, in the present invention, the dogleg shape is bent at a central portion thereof, and both side portions of the bending point are straight lines. By using the amorphous metal ribbon manufacturing nozzle, the convenience of actually manufacturing the nozzle is achieved.

The contents of the present invention will be described below with reference to FIGS.

[0011]

EXAMPLE An Fe—Si—B alloy was selected as the molten metal, and an amorphous metal ribbon having a width of 250 mm and a thickness of 35 μm was produced using various nozzles according to the present invention. FIG. 8 is a vertical sectional view of the entire apparatus showing a conventional implementation state. In FIG. 8, the molten metal 1 is a cooling roll 2 under high speed rotation.
When it is sprayed from the quartz glass nozzle 3 on the surface of, the pool (paddle) 4 is generated between the cooling roll 2 and the nozzle 3, and then the molten metal flows out from the paddle in the rotation direction of the cooling roll. At the same time, it is rapidly cooled and solidified to become an amorphous metal ribbon 7. At that time, since the casting is performed in the atmosphere, conventionally, an entrained air flow 5 (mainly air) of the cooling roll is generated, which collides with the paddle 4, and the paddle 4 vibrates and the thin film during manufacturing An air pocket 6 was formed between the strip 7 and the cooling roll 2. As a result, the air pool deteriorated the surface condition of the ribbon 7.

Therefore, in the present invention, the nozzle shown in FIG. 1 was first proposed and used. FIG. 1 is a vertical cross section of a nozzle 3 according to the present invention relating to claims 1 to 3, and FIG.
FIG. 3 is a view showing an arrow B in FIG. Compared with FIG. 8 of the prior art, FIGS. 1, 2 and 3 of the present invention are different in that a circulation groove is formed in the nozzle tip refractory material from the lower surface side to the upper side so that the accompanying airflow of the cooling roll flows. ing. As shown in FIG. 1, the circulation groove 9 is provided parallel to the vertical plane of the refractory material 10 on the upstream side in the rotation direction of the cooling roll 2 from the injection slit 8 of the molten metal 1, whereby the accompanying airflow 5 of the cooling roll 5 is provided. Escapes in the nozzle width direction (see FIG. 3), so that the flow rate of air entrained by the cooling roll colliding with the paddle 4 is reduced, and the vibration of the paddle is also reduced. As a result, the amount 6 of air pockets generated by the paddle vibration was reduced, and the surface condition of the manufactured ribbon 7 became very good.

Next, FIG. 4 shows another embodiment of the nozzle 3 according to the present invention, which corresponds to the line AA of FIG. There, the injection slit 8 itself of the molten metal 1 is in the shape of a dogleg to the downstream side in the rotation direction of the cooling roll 2 at the central portion. Therefore, the entrained airflow 5 that collides with the paddle 4 easily escapes in the width direction of the lower surface of the nozzle refractory 10, and an effect substantially similar to the above is produced. The concave shape may have a curvature at a bending point, but as shown in FIG. 4, it is 5 ° to 1 from the long side.
The results were good when tilted at 0 °. FIG. 5 shows the flow of the accompanying airflow 5 in the nozzle 3 of FIG.

Finally, FIG. 6 shows that the jet slit 8 has a dogleg-shaped nozzle 3 and a flow groove 9 for allowing the entrained airflow 5 to escape is additionally provided on the lower surface of the nozzle refractory material 10. Yes (corresponding to the arrow AA in FIG. 1). In addition, FIG. 7 shows the above-mentioned accompanying airflow 5 when the nozzle of FIG. 6 is used.
Shows the flow of. Therefore, it is not necessary to explain that the above effect is further promoted. As is apparent from FIGS. 6 and 7, the flow groove 9 in this case has a straight shape, but the effect is further enhanced by making it into a dogleg shape. In the above three examples, the molten metal 1 was cast in the air atmosphere, but the atmosphere may be an inert gas or the like, and the nozzle 3 according to the present invention does not limit the use atmosphere. Absent.

[0015]

As described above, according to the present invention, the paddle formed by spraying the molten metal on the surface of the cooling roll under the high speed rotation is disturbed by the accompanying airflow of the cooling roll, and the manufactured ribbon is produced. It was possible to reduce the deterioration of the surface condition of.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a nozzle according to the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a view taken in the direction of arrows BB in FIG. 1;

FIG. 4 is a view showing another aspect of the nozzle according to the present invention,
It is a figure which shows the part corresponding to the AA arrow view of FIG.

5 is a diagram showing the flow of the accompanying airflow of the cooling roll when the nozzle of FIG. 4 is used.

FIG. 6 is a view showing the nozzle of FIG. 4 with a flow groove added to allow a flow of air accompanying a cooling roll to be added, and FIG.
Corresponds to the arrow A view.

7 is a diagram showing the flow of the accompanying airflow when the nozzle of FIG. 6 is used.

FIG. 8 is a vertical cross-sectional view showing a manufacturing state of an amorphous metal ribbon using a conventional nozzle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molten metal 2 Cooling roll 3 Nozzle 4 Hot water pool (paddle) 5 Entrained airflow 6 Gas pool 7 Amorphous metal thin strip (thin strip) 8 Injection slit 9 Flow groove 10 Refractory material

Front page continued (72) Kenji Nakagawa, 1st Kawasaki-cho, Chuo-ku, Chiba City, Chiba Steel Works, Ltd. (72) Kuniaki Sato, 1st Kawasaki-cho, Chuo-ku, Chiba City, Chiba Steel Works, Ltd.

Claims (6)

[Claims] 1. An amorphous metal ribbon comprising an injection slit for supplying molten metal from a tundish onto a surface of a cooling roll that rotates at a high speed and forming a pool of the molten metal, and a refractory material surrounding the injection slit. In the manufacturing nozzle of, the circulation groove for flowing the accompanying air current of the cooling roll rotating at high speed, in the refractory material, above the lower surface of the refractory material,
A nozzle for producing an amorphous metal ribbon, which is provided in the nozzle width direction. 2. The production of an amorphous metal ribbon according to claim 1, wherein the flow groove is provided in parallel with the vertical surface of the refractory material on the upstream side of the injection slit in the rotation direction of the cooling roll. Nozzle. 3. The flow groove has a shape bent in a dogleg shape in the refractory material on the upstream side in the rotation direction of the cooling roll with respect to the injection slit and to the downstream side in the rotation direction of the cooling roll. A nozzle for producing an amorphous metal ribbon according to claim 1. 4. An amorphous metal ribbon comprising a jetting slit for supplying molten metal from a tundish onto a surface of a chill roll that rotates at a high speed and forming a pool of molten metal, and a refractory material surrounding the jetting slit. In the manufacturing nozzle described above, the injection slit is bent at a central portion in a V shape with respect to the downstream side in the rotation direction of the cooling roll, and an area on the cooling roll through which the accompanying airflow of the high-speed rotating cooling roll passes. A nozzle for producing an amorphous metal ribbon, which is characterized in that 5. A circulation flow in which a circulating air current of the V-shaped cooling roll that rotates at a high speed is flowed into the refractory material on the upstream side of the injection slit in the cooling roll rotation direction with respect to the downstream side of the cooling roll rotation direction. The nozzle for producing an amorphous metal ribbon according to claim 4, wherein the groove is provided above the lower surface of the refractory material and in the nozzle width direction. 6. The amorphous material according to claim 3, wherein the dogleg shape is bent at a central portion thereof, and both sides of the bending point are straight lines. Nozzle for the production of fine metal ribbon.