JPS62166056A - Method and apparatus for producing rapid cooling solidified foil metal - Google Patents

Abstract

PURPOSE:To uniformize thickness is width direction of foil metal at the time of producing the foil metal by rapid cooling as bringing molten metal flowed down from a slit nozzle into contact with a cooling body moving at high speed, by widening the slit gap toward its both ends gradually to make more flow- down rate as approaching to both ends. CONSTITUTION:The molten metal 6 in a molten metal storage vessel 1 is flowed down from the slit nozzle 2 and brought into contact with the cooling roll 3 rotating at high speed to cool rapidly and produce the foil metal 7. In case of parallel gap for this slit 21, the foil metal 7A becomes to thicker as approaching to both ends thereof. Therefore, by making wider for the gap as approaching to both ends of slit 22, the foil metal 7B is obtd. uniformly for thickness in the width direction. Further, in case forming the nozzle 2 by small hole, the hole diameter as approaching to both ends makes bigger. And by longer slit-lit as approaching to the center part, the flow-down rate at the center part may reduce by this contacting resistance.

Description

[Detailed Description of the Invention] Purpose of the Invention [Industrial Application Field] The present invention relates to an improvement in a method for producing a rapidly solidified metal ribbon,
To provide a method for providing a metal ribbon having a uniform thickness across the width. The invention also relates to an apparatus for use in carrying out such a manufacturing method.

(Prior Art) Rapidly cooling and solidifying molten metal to obtain a ribbon is practiced as an alternative to manufacturing amorphous bodies or rolling difficult-to-process materials.

There are many techniques for manufacturing such rapidly solidified metal ribbons, but in principle they all utilize a cooling body that is moving at high speed. There are roll methods, belt casting methods, etc.

For example, in the single roll method, as shown in FIGS. 1 and 2, molten metal 6 is transferred from a molten metal storage tank 1 onto a cooling roll 3 that is rotating at a high speed and is attached to the storage tank and placed on the shaft of the cooling roll. It flows down from a nozzle 2 extending in the same direction and contacts it to obtain a metal ribbon 7, which is then rapidly cooled at the same time.

One of the problems experienced in implementing this method is the difficulty in obtaining uniform thickness across the width of the ribbon. It is particularly strongly required that the thickness of the ribbon be uniform, for example when a laminated core is to be manufactured.

[Problems to be Solved by the Invention] One object of the present invention is to meet the above requirements and provide a method for producing a rapidly solidified metal ribbon having a uniform thickness across the width.

Another object of the present invention is to provide an apparatus for manufacturing the rapidly solidified metal ribbon as described above.

Structure of the Invention [Means for Solving Problems] The present inventor has proposed that a ribbon obtained by using a nozzle 2A having a cross-sectional shape as shown in FIG. It has been found that, as shown by 7A in FIG. 5, there is a tendency for the central part to be thick and the edges to be thin.

As a countermeasure based on this knowledge, the method of manufacturing rapidly solidified metal ribbon proposed by the present inventor is shown in Figs. 1 and 2, for example.
As shown in the figure, a cooling roll 3 that rotates at high speed is used as a cooling body that is moving at high speed, and molten metal is flowed down from a nozzle 2 extending in the axial direction of this roll and brought into contact with it. In the method for manufacturing the rapidly solidified metal ribbon 7, which involves forming the metal ribbon and simultaneously rapidly cooling it, the amount of molten metal flowing down is relatively small at the center of the roll 3, and gradually increases as it approaches both ends. It is characterized by obtaining a metal ribbon having a uniform thickness across the width direction by carrying out the process under conditions that increase the thickness of the metal strip.

The rapidly solidified metal ribbon manufacturing apparatus of the present invention that achieves the above-mentioned conditions is, for example, as shown in FIGS. 1 and 2.
A cooling roll 3 capable of rotating at high speed is used as a cooling body moving at high speed, and has a nozzle 2 located above and close to this roll and extending in the axial direction of the roll. In the apparatus for producing a rapidly solidified metal ribbon 7 essentially consisting of a molten metal supply means, the amount of molten metal supplied from the nozzle 2 to the cooling roll 3 is relatively small at the center of the roll 3. , it is characterized by providing a metal ribbon having a uniform thickness across the width by providing nozzles with a shape that increases relatively toward both ends.

To give a specific example of a nozzle, the cross section of the nozzle is in the shape of a slit 22, as shown as 2B in Fig. 4, and the width is small in the center and increases continuously as it approaches both ends. Representative. The change in slit width may be intermittent.

The nozzle does not necessarily have to be a continuous slit, but can also consist of a row of many adjacent small holes, and as shown in the cross section in FIG. The nozzle 2C may be small in size and gradually become larger as it approaches both ends, or, although not shown, the interval between the holes may be large in the center of the nozzle and gradually become smaller as it approaches both ends. There may be.

Another nozzle has a slit-like cross section, as shown as 2D in FIG. It has a receding longitudinal section.

[Function] As can be readily understood from the cross-sectional shape of the nozzle illustrated in FIGS. 4 and 7, the amount of molten metal flowing down toward the roll is larger near both ends than in the center. By canceling out the uneven thickness of the ribbon caused by the slits at regular intervals, a ribbon of uniform thickness as shown at 7B in FIG. 6 can be obtained.

Even in the nozzle having the shape shown in Fig. 8, the resistance to the flow of molten metal is smaller at both ends where the lip is shorter than at the center where the lip is longer. A metal ribbon with a cross section as shown in FIG. 6 is provided.

[Example] A nozzle having a cross-sectional shape shown in FIG. 3, a slit interval of 0.6 m, and a length of 10# was fabricated by processing transparent quartz. When a rapidly solidified metal ribbon of an alloy having a composition of 80Fe-43i-15B-1C was produced using this nozzle and the apparatus shown in Figs. 1 and 2, it had a cross section as shown in Fig. 5. 1q of thin strips were made, and the thickness was approximately 40μ at the center and 32 to 36μ at both edges.

A nozzle was made using the same material and having the cross-sectional shape shown in Figure 4, with a slit interval of 0.6 m at the narrowest point in the center and 0.75 # at the widest point at both ends (the slit widths were the same). The ribbon obtained using this nozzle had a thickness of 40 μm, which was substantially uniform across the width.

Effects of the Invention According to the present invention, a rapidly solidified metal ribbon having a uniform thickness across the width can be produced.

Although the above embodiment has been explained using a cooling roll as an example of the cooling body, the present invention can obtain similar effects even when applied to a belt casting method using other cooling bodies, such as a belt. can.

[Brief explanation of drawings]

1 and 2 are conceptual diagrams showing a method and apparatus for producing a rapidly solidified metal ribbon by a single roll method, in which FIG. 1 is a cross-sectional view and FIG. 2 is a front view. . FIG. 3 is a cross-sectional view of a nozzle used in the conventional rapidly solidified metal ribbon manufacturing technique. FIG. 4 is a cross-sectional view of a nozzle according to the invention. 5 and 6 are cross-sectional views of metal ribbons obtained by rapid solidification, with FIG. 5 showing the case using the conventional nozzle shown in FIG. 3, and FIG. The cases in which the nozzle of the present invention shown in the figures is used are shown respectively. FIG. 7 is a cross-sectional view showing another embodiment of the nozzle according to the invention. FIG. 8 is a longitudinal sectional view of a roughly alternative embodiment of a nozzle also according to the invention. 1... Molten metal storage tank 2.2A, 2B, 2C, 2D... Nozzle 3... Cooling roll 6... Molten metal 7.7A, 7B... Rapidly solidified metal ribbon Patent applicant
Daido Steel Co., Ltd. Representative Patent Attorney Souo Suga Figure 1 Figure 2

Claims (6)

[Claims] (1) Molten metal is brought into contact with the cooling body that is moving at high speed by flowing down from a nozzle extending in a direction substantially perpendicular to the direction of movement of the cooling body, forming a metal ribbon and simultaneously rapidly cooling it. In the method for producing rapidly solidified metal ribbon, the amount of molten metal flowing down is relatively small in the center of the cooling body, and increases as it approaches both ends. A manufacturing method characterized by obtaining a metal ribbon having a uniform thickness over the entire area. (2) A cooling body capable of moving at a high speed; and a molten metal supply means that is located above and close to the cooling body and has a nozzle extending in a direction substantially perpendicular to the direction of movement of the cooling body at the bottom. In an apparatus for producing a rapidly solidified metal ribbon essentially consisting of: the amount of molten metal supplied from the nozzle to the cooling body is relatively small in the center of the cooling body;
A manufacturing device characterized by providing a metal ribbon having a uniform thickness across the width by providing nozzles with a shape that increases relatively toward both ends. (3) The manufacturing apparatus according to claim 2, wherein the cross section of the nozzle is slit-shaped, and the width thereof is small in the center and increases continuously or intermittently as it approaches both ends. (4) The cross section of the nozzle consists of a large number of adjacent rows of small holes, and the diameter of each hole is small in the center of the nozzle and gradually increases as it approaches both ends. Manufacturing equipment. (5) The cross section of the nozzle consists of a large number of adjacent rows of small holes, and the distance between the holes is large in the center of the nozzle and gradually becomes smaller as it approaches both ends. Manufacturing equipment. (6) The cross section of the nozzle has a slit shape or a row of small holes, and the lip thereof is most advanced in the center of the nozzle and gradually retreats as it approaches both ends. Manufacturing equipment.