JPH08117929A - Production of thin strip metal and nozzle for production - Google Patents

Abstract

PURPOSE: To obtain a process for producing a broad thin strip metal having a good shape which suppresses striped defects and a nozzle for production in a process for producing the thin strip metal by using the perforated nozzle. CONSTITUTION: Plural pieces of openings 2 having a parallelogram shape or trapezoidal shape are arranged in nearly perpendicular to the moving direction of a cooling substrate and both ends of this opening array are provided with small openings 2' having a triangular shape. Further, the nozzle 3 provided with a recess 1 of a specified depth over the entire part of at least the apertures and inter-opening spacing parts is installed to face the cooling substrate only on the side facing the cooling substrate. The thin strip metal is produced by ejecting molten metal out of the nozzle 3 onto the surface of the cooling substrate and cooling and solidifying the molten metal. The occupying rate at the time of laminating the thin strip metal or winding the strip metal is improved by using the nozzle for producing the thin strip metal specified in the shape of the recess of the nozzle 3 on the side facing the cooling substrate. The application of the thin strip metal to a laminated transformer of a large size or wound transformer is made possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for rapidly melting and solidifying a molten sample of a metal or alloy (hereinafter referred to as "metal") on the surface of a moving cooling substrate to continuously form an amorphous or crystalline metal ribbon. The present invention relates to a manufacturing method.

[0002]

2. Description of the Related Art Various methods have been disclosed in the past for a method for continuously producing a ribbon from a molten metal (continuous liquid quenching method), but all have a molten metal having an opening of a predetermined shape. It is jetted from a nozzle with a predetermined pressure onto a moving cooling substrate facing the nozzle opening and solidified to form a continuous ribbon. At this time, important manufacturing factors are the shape of the nozzle opening, the relative position of the nozzle and the cooling substrate, the pressure of the molten metal ejected from the nozzle, the moving speed of the cooling substrate, and the like.

A representative method conventionally disclosed as a method for producing a rapidly solidified metal ribbon is disclosed in, for example, JP-A-53-53.
No. 53525, “Continuous casting method for metal strip and apparatus used therefor”. The outline is that a slot nozzle with a rectangular opening is used as a cooling substrate and 0.03 to 1
In a state where the rectangular openings are arranged substantially perpendicular to the moving direction of the surface of the cooling substrate,
The molten metal is sent out from a slot nozzle onto a cooling substrate that moves at a predetermined surface speed of 100 to 2000 m / min, is thermally contacted and rapidly solidified to produce a strip continuously.

In principle, the above conventional method has no limitation on the width of the ribbon. That is, the width of the ribbon can be widened by increasing the length of the rectangular opening (the length of the opening measured in the direction perpendicular to the moving direction of the cooling substrate). However, in reality, as the length of the rectangular opening increases,
It becomes difficult to maintain the parallelism of the opening during casting. That is, as shown in FIGS. 11A and 11B, a convex or concave deformation due to thermal expansion of the nozzle 3,
It is difficult to maintain the parallelism of the opening 2 due to deformation due to nonuniform temperature.

When the parallelism of the rectangular opening is impaired in this way, the plate thickness of the formed ribbon becomes uneven particularly in the width direction. Therefore, conventionally, it has been difficult to form a thin strip having a uniform plate thickness in the width direction as the plate width increases. In addition, thin ribbons with non-uniform plate thickness may be laminated as a magnetic material,
In the case of winding processing, the space factor decreases, which is not preferable. By the way, in a 25 mm wide ribbon, it is possible to suppress the plate thickness deviation to about 5 to 10% by a conventional casting method, but it has been difficult to suppress it to 10% or less at a width of 150 mm. Therefore, in the conventional method for providing the rapidly solidified ribbon as an industrial material, the strip width of the ribbon is practically limited.

The present inventors have, for example, disclosed in Japanese Patent Laid-Open No. 63-220950 in order to remove the limitation on the plate width of the rapidly solidified ribbon.
In the gazette, a new casting method was proposed. In this method, a plurality of parallelogram-shaped openings 2 are arranged on a moving cooling substrate, for example, as shown in FIG. 5, at substantially right angles to the direction of movement of the cooling substrate. This is a method of manufacturing a metal ribbon using a nozzle provided with a small opening 2 '. Further, in the single-roll rapid solidification ribbon production apparatus shown in FIG. 8, the nozzle 3 as shown in FIG. 5 is provided below the crucible 8 and the molten sample 6 melted by the heating device 7 is rotated at a high speed. It is a method in which the metal ribbon 5 is jetted onto the surface of. This method integrates individual openings made of parallelograms or triangles and a pool of molten sample formed between cooling substrates (hereinafter referred to as "paddles") in a direction perpendicular to the direction of movement of the cooling substrate to achieve plate thickness accuracy. Is a method for producing a good ribbon.

According to this method, the width of the ribbon is, for example, 1
Even with a thickness of 50 mm or more, it is possible to manufacture a ribbon having a plate thickness deviation of 10% or less. Further, by controlling the number of parallelogram-shaped openings, it becomes possible to manufacture a thin strip having an arbitrary strip width, so that the limitation on the strip width can be removed.

[0008]

However, in order to stably produce a metal by using the method disclosed in Japanese Patent Laid-Open No. 63-220950, further improvement is required. That is, a dent defect (hereinafter, referred to as a “streak defect”) was occasionally generated on the roll surface of the obtained ribbon along the cooling substrate moving direction. This streak-like defect is generated at a position corresponding to the opening of the nozzle used, but it is considered to be generated by entraining the atmospheric gas at the joint between the individual paddles described above.

The method of forming the streak defects will be described below. FIG. 9 shows a schematic diagram in which the behavior of the molten sample near the nozzle and the roll surface in the single roll rapid solidification production apparatus shown in FIG. 8 is enlarged. In FIG. 9, when the molten sample is jetted onto the roll surface through the nozzle 3, a paddle 9 is formed between the nozzle opening and the roll surface. Immediately below the paddle, a thin strip 5 is formed on the roll surface. FIG. 9 is a schematic view of the state of casting as seen from the side, showing two adjacent openings and a paddle formed between the roll surfaces.

Further, FIG. 10 shows a schematic view of the state of this casting seen through from above. In FIG. 10, the individual nozzle openings 2 and 2 ′ are shown by dotted lines, but an integrated paddle 9 is formed around these openings, and a ribbon 5 is formed immediately below the paddle 9. The contour of the integrated paddle behind the roll rotation direction is almost straight,
Occasionally there is a slight dent between the nozzle openings that is not a perfect straight line 1
0 forms. When such a dent 10 is formed, the atmospheric gas carried by the moving roll is preferentially entrained between the paddle and the roll surface, and a streak-like defect 11 is formed on the roll surface of the ribbon. Such streak defects are not preferable because they cause a decrease in space factor when laminating or winding.

It is an object of the present invention to provide a method for manufacturing a good ribbon and a nozzle for manufacturing, which suppresses the generation of streak defects which have been an obstacle to the production of such a metal ribbon. .

[0012]

The present invention is characterized by the following items. That is, (1) a plurality of parallelogram-shaped or trapezoidal openings are arranged substantially at right angles to the moving direction of the cooling substrate, small triangular openings are provided at both ends of the opening row, and the openings are opposed to the cooling substrate. A nozzle provided with a recess having a constant depth over at least the opening and the entire opening interval is provided facing the cooling substrate, and a molten sample of metal or alloy is provided from the nozzle onto the surface of the cooling substrate. A method for producing a metal ribbon which is jetted and rapidly solidified. (2) The recess provided on the side of the nozzle facing the cooling substrate has a depth d ₀ of 0.05 mm or more from the surface of the nozzle facing the cooling substrate, and from the front end of the plurality of openings of the nozzle in the cooling substrate moving direction. The length d ₁ to the front edge of the recess and the length d ₂ from the rear end to the rear edge of the recess are both 3 mm or less, and further from the outer end of the outermost end of the plurality of openings of the nozzle. The method for producing a metal ribbon according to (1) above, wherein the lengths d ₃ and d ₄ of the recess to both side edges are both 1 mm or less. (3) Height a is 0.5 to 8.0 mm, bottom length b is 0.1 to 2.0 mm, and spacing c between adjacent openings is 0.2.
˜3.0 mm, a plurality of parallelogrammic openings having an inclination of 10 ° to 80 ° with respect to a direction perpendicular to the moving direction of the cooling substrate are arranged substantially at right angles to the moving direction of the cooling substrate, and both ends of the row of openings are arranged. Has a small triangular opening having a height approximately half the height a of the parallelogram-shaped opening, and the depth from the surface of the nozzle facing the cooling substrate only on the side facing the cooling substrate. d ₀ is 0.05 mm or more, and the length d from the front end of the plurality of openings of the nozzle in the cooling substrate moving direction to the front edge of the depression
₁ and the length d ₂ from the rear end to the rear edge of the recess are both 3 mm or less, and further, the length d ₂ from the outer ends of the openings at the outermost ends of the plurality of openings of the nozzle to both side edges of the recess. Nozzle for producing a metal ribbon, which has a depression in which both ₃ and d ₄ are 1 mm or less. (4) Height a is 0.5 to 8.0 mm, bottom length b ₁ is 0.5 to 5.0 mm, and top length b ₂ is 0.1 to 2.0.
mm, a plurality of trapezoidal openings having a distance c between adjacent openings of 0.2 to 3.0 mm are arranged substantially at right angles to the moving direction of the cooling substrate, and an array of the plurality of openings is arranged adjacent to each other. And a part of them overlap in the movement direction, and the total length of the openings in the movement direction is arranged in a direction perpendicular to the movement direction so as to have substantially the same length over the range in which the openings are present. A small triangular opening having the height of the trapezoidal opening is provided at both ends of the opening row, and the depth d ₀ from the facing surface of the cooling substrate of the nozzle is provided only on the side facing the cooling substrate. 0.05 mm or more, the length d ₁ from the front end of the plurality of openings of the nozzle in the cooling substrate moving direction to the front edge of the recess and the length d ₂ from the rear end to the rear edge of the recess are both 3 mm or less, Furthermore, of the multiple openings of the nozzle, the openings at the extreme ends Both side edge to the length d ₃ of the recess from the outer end, d ₄ is replaced by a metal ribbon manufacturing a nozzle having a recess both at 1mm or less.

The present invention will be described in detail below. FIG.
FIG. 4 is a diagram schematically showing a nozzle of the present invention. FIG.
1B is a side view of the AA cross section of FIG.
When actually used for casting, the cooling substrate 4 is provided on the lower side of FIG.
To come. 1A and 1C are views seen from above and below the nozzle (the surface facing the cooling substrate), respectively. As shown in FIG. 1, the nozzle of the present invention is characterized by having a recess 1 only on the side of the nozzle 3 facing the cooling substrate 4. By jetting a molten sample of metal onto the surface of a moving cooling substrate using a nozzle having such a depression and casting, it is possible to manufacture a metal ribbon without streak defects.

The reason why streak defects are not formed on the roll surface of the metal ribbon by using the nozzle of the present invention is considered as follows. That is, the molten samples ejected from the plurality of openings 2 and 2'on the nozzle are connected to each other in the direction perpendicular to the moving direction of the cooling substrate at the recess 1 provided on the side of the nozzle facing the cooling substrate, and the paddles are connected to each other. Are likely to be integrated, and the part in which the atmospheric gas is preferentially entrained in the integrated paddle disappears, so that no streak defect is generated. The plurality of openings 2 of the nozzle and the recess 1 on the side facing the cooling substrate must be integrally provided as a nozzle member.

Next, the reason why the size of the recess 1 is limited will be described. The depth (d ₀ in FIG. 1B) from the surface of the recessed nozzle facing the cooling substrate was set to 0.05 mm or more. This means that when the value of d ₀ is less than 0.05 mm, streak defects are observed. This is because the effect of suppressing the generation of is hardly recognized. That is, as shown in FIG. 2, the value of d ₀ is 0.05 m.
If it is less than m, the occurrence rate of streak defects is as high as 20% or more.
This is because when the value of d ₀ is less than 0.05 mm, the individual paddles formed in the plurality of openings of the nozzle are integrated even if a recess is provided on the side of the nozzle facing the cooling substrate, but This is because it is easy to preferentially involve the atmospheric gas at the joint.

Further, as can be seen from FIG. 2, when the value of d ₀ is 0.5 mm or more, there are no streak-like defects, so the value of d ₀ is preferably 0.5 mm or more. Further, when the value of d ₀ reaches the thickness of the nozzle, an opening similar to the rectangular opening used in the conventional casting method described in JP-A-53-53525 is obtained, and such a nozzle is used. In the opening, the plate width of the metal ribbon is practically limited, and the plate thickness deviation becomes poor. Therefore, it goes without saying that the value of d ₀ is less than the thickness of the nozzle used.

In the present invention, the thickness of the nozzle is not particularly specified. However, if the thickness of the nozzle becomes too large, it takes time and labor to process the nozzle opening and preheat the nozzle before casting. It is not preferable to make it too thick. The thickness of the nozzle is preferably about 20 mm or less. On the other hand, the value of d ₀ is at most a few m
It is preferable that the value is as small as m. This is because the strengths of the plurality of openings of the nozzle are taken into consideration.

Next, is limited to the front edge 1X of the recess from a cooling substrate moving forward end 2X of the plurality of openings of the nozzle length d _1, and to the edge 1Y after the recess from the rear end 2Y length d ₂ The reason is as follows. The values of d ₁ and d ₂ shown in FIG. 1 (c) are both set to 3 mm or less because the occurrence rate of streak defects is 20 when the value exceeds 3 mm as shown in FIG.
This is because it becomes as high as more than%. The value of d ₁ and d ₂ is 3
It is considered that when the thickness is equal to or larger than mm, the depression is no longer provided on the side of the nozzle facing the cooling substrate. That is, since the atmospheric gas is preferentially drawn in at the joint between the individual paddles of the integrated paddle, streak defects are generated. The values of d ₁ and d ₂ may be the same or different as long as they are within this range.

Further, the length of the recess on the side of the nozzle facing the cooling substrate in the direction perpendicular to the moving direction of the cooling substrate is defined by the outer ends 2'Z of the outermost ends of the plurality of openings of the nozzle from both sides of the recess. The reason for limiting the lengths d ₃ and d ₄ up to the edge 1Z will be described. D ₃ and d ₄ shown in FIG. 1 (c)
The range of the value of was limited to 1 mm or less
This is because if the thickness exceeds mm, the plate thickness becomes thin at both edge portions of the obtained ribbon. The values of d ₃ and d ₄ are preferably the same within this range. The size of this depression 1 is
According to other casting conditions, an optimum value within the above range may be appropriately selected. The optimum combination of values for the dimensions of the nozzles actually used will be concretely shown in Examples described later.

The nozzle of the present invention should not have an upper part composed of a plurality of openings as shown in FIG. 4 and a lower part composed of rectangular holes separated from each other. During actual casting, the nozzle is maintained at a high temperature, but the nozzle easily deforms due to thermal expansion. As shown in FIG. 4, when two nozzles are superposed, the upper portion is less likely to be deformed due to thermal expansion, but the lower rectangular hole is difficult to maintain parallelism. That is, as shown in FIGS. 11 (a) and 11 (b),
It is difficult to maintain the parallelism of the opening 2 due to deformation of the convex or concave shape due to thermal expansion of the nozzle 3, deformation due to uneven temperature, and the like. Therefore, when the nozzle structure as shown in FIG. 4 is used, the rectangular hole in the lower portion becomes wider or narrower in the central portion in the longitudinal direction, which hinders the connection with the plurality of openings in the upper portion.

When a plurality of opening shapes of the nozzle are, for example, parallelogram-shaped openings, the parameters defining the opening shape are
As shown in FIG. 5, the length a of each opening 2 in the cooling substrate moving direction, the length b in the direction perpendicular to the cooling substrate moving direction, the spacing c of each opening and the inclination α are shown.

Next, the range of the size of each parameter will be described. a is 0.5 to 8.0 mm, b is 0.1 to
2.0 mm, and c is in the range of 0.2 to 3.0 mm. Further, α is in the range of 10 ° to 80 °. What is important here is that a plurality of these openings are formed such that some of the openings adjacent to each other overlap in the cooling substrate moving direction, and the total opening length in the moving direction is perpendicular to the moving direction.
That is, the lengths should be approximately the same over the range in which the openings are present.

The above-mentioned shape parameters indicate the preferable range of the embodiment. The height a is a parameter related to the thickness of the thin strip, and if the value of a exceeds 8.0 mm, the thickness of the thin strip becomes too large and it becomes difficult to form a thin strip having a good shape. Furthermore, regarding the parameters of b and c,
When the value exceeds the upper limit of the above range, it becomes difficult to produce a good ribbon. Further, the lower limits of these parameters are values set to eliminate difficulties in nozzle fabrication.

Further, at both ends of the plurality of opening rows of the nozzle,
Small openings 2'each having a triangular shape are provided. The base of this triangular small opening is located on the extension of the line connecting the front and rear ends of the parallelogram-shaped openings. This is to prevent the ribbon from becoming extremely thin at the edge portion, but it is preferable that its height is approximately half the height of the parallelogram-shaped opening.

Regarding the shape of the plurality of openings of the nozzle, not only the parallelogram-shaped openings but also trapezoidal openings may be used.
The parameters that define the opening shape in the case of the trapezoidal opening are the length a (height of the trapezoidal opening) of the individual openings 2 in the cooling substrate moving direction shown in FIG. 6, and the direction perpendicular to the cooling substrate moving direction. The lengths b1 and b2 (the bottom side and the top side of the trapezoidal opening) and the spacing c between the individual openings.

The range of the size of each parameter will be described. a is 0.5 to 8.0 mm, b1 and b2 are
0.5-5.0 mm and 0.1-2.0 mm, respectively
Range. Further, c is in the range of 0.2 to 3.0 mm. As in the case of the parallelogram openings, what is important is that a plurality of these openings are overlapped with each other in the moving direction of the cooling substrate, and the total opening length in the moving direction is the moving direction. To have approximately the same length over the range where the aperture is present, in the direction perpendicular to.

Also, as in the case of the parallelogram opening, triangular openings 2'are provided at both ends of the plurality of opening rows of the nozzle, the height of which is the same as the height of the trapezoidal opening. Is preferred. The base of the triangular small opening is located on an extension of the line connecting the bases of the trapezoidal openings.

When the plurality of openings of the nozzle have a trapezoidal shape, the length d of the plurality of openings of the nozzle from the front end 2X of the cooling board movement direction to the front edge 1X of the depression is the length d of the plurality of openings of the nozzle. The length d ₂ from ₁ and the rear end 2Y to the trailing edge 1X of the depression is the length shown in FIG. 7, and is the distance from the bottom of the trapezoidal opening to the edge of the depression. Further, the length of the recess on the side of the nozzle facing the cooling substrate in the direction perpendicular to the direction of movement of the cooling substrate is defined by the outer ends 2'Z of the outermost ends of the plurality of openings of the nozzle and the side edges 1Z of the recess.
The lengths d ₃ and d _{4 up to} are shown in FIG. 7.

The basic method employed in the present invention is
Among the continuous liquid rapid cooling methods in which a molten metal sample is jetted onto the cooling substrate 4 through the nozzle 3 and rapidly cooled and solidified by thermal contact, the so-called single roll rapid cooling method is used. Of course, the method of centrifugal quenching using the inner wall of the drum or the method of using an endless type belt, these improved types, for example, the method using an auxiliary roll or a device equipped with a roll surface temperature control device, or under reduced pressure or vacuum or Casting in an inert gas is also included.

Next, the casting conditions adopted in the present invention and the concrete casting work will be described. The distance between the lower surface of the nozzle and the cooling substrate is in the range of 0.05 to 3 mm,
The optimum value can be selected within the above range depending on the nozzle structure. Injection pressure of molten metal is 0.01-3kg / c
m ² and the rotation speed (surface speed) of the roll are in the range of 5 to 60 m / sec. With respect to these conditions, optimum values can be selected in accordance with the structure of the nozzle, the desired thickness of the thin strip, and other manufacturing conditions.

As a casting operation, an optimum gap position between the nozzle and the roll is set in advance before the start of melting in consideration of casting, and then the crucible is once moved into the work coil for melting the sample, and then the sample is sampled. Dissolve. After the melting, the roll is rotated and the jet pressure is set, and then the crucible is returned to the preset optimum gap position with the roll to start casting. Therefore, the position of the work coil is preferably set at a position slightly apart from the roll surface.

[0032]

EXAMPLES The present invention will be further described with reference to examples. Example Using the various nozzles shown in Table 1, ribbons were manufactured by the single roll ribbon manufacturing apparatus in air. The cooling roll used is made of copper and has a diameter of 300 mm and a width of 50 mm. The sample dissolution method is a high frequency induction method.

Casting conditions other than those shown in Table 1 are as follows. Melting component: Fe-Si _6.5 -B ₁₂ -C ₁ (amorphous alloy) Weight of melting sample: 100 g crucible, nozzle material: transparent quartz Shape of multiple openings in the nozzle: Distance between both ends of the opening (Fig. 5)
And L) about 25 mm shown in FIG. 6 Number of multiple openings: No. of parallelograms; 15 parallelograms, two triangular openings at both ends Trapezoidal; eight trapezoids, triangular at both ends Two small openings Roll surface speed: 24m / s Nozzle gap: 0.3mm Jet pressure: 0.5kg / cm ^{2 for} Charge No. 8 and 0.2kg / cm ^{2 for} other charges

All ribbons were examined with a magnifying projector for the presence or absence of streak defects on the roll surface of the ribbons. For strips in which streak defects were observed, their lengths were measured, the ratio to the length of the entire strip was determined, and the strip defect rate was arranged. The results are also shown in Table 1. When a plurality of streak-like defects occurred in the width direction of the thin strip, the total length of all streak-like defects was defined as the length of the generated streak-like defects. Further, the length, the maximum plate thickness, the average plate thickness and the plate width of all the ribbons were measured, and these data are summarized in Table 1. The maximum plate thickness is the value obtained with a micrometer,
The average plate thickness is a value calculated from the density (7.26 g / cm ³ ) of the alloy, the plate width and the length.

[0035]

[Table 1]

As can be seen from Table 1, a wide thin plate having a width of about 25 to 26 mm was obtained with any of the charges of the present invention. In addition, these had low occurrence rates of streak defects of less than 10%, and were good metal ribbons. It should be noted that in No. 1 to 11 charges, the plurality of nozzle openings have a parallelogram shape, and in No. 12 to 15 charges, the nozzle openings have a trapezoidal shape.

Comparative Examples Comparative examples are shown in Table 1 after No. 16. The charges of Nos. 16 to 19 have a parallelogram shape of the plurality of openings of the nozzle, and the charges of Nos. 20 and 21 have a trapezoidal shape of the openings of the nozzle. When cast under the conditions shown above, the rate of occurrence of streak defects was 10 for both charges.
% And a high value.

[0038]

As described above, according to the present invention, it is possible to suppress streak-like defects that have been generated in ribbons so far, and thus it is possible to realize the production of ribbons having a desired shape and having an arbitrarily wide width. As a result, the thin strip has an improved space factor when laminated or wound, and thus can be applied to, for example, a large stacking transformer or a winding transformer. Further, by plating a highly conductive metal such as Cu plating, it is suitable as an electromagnetic wave shield material, particularly as a blind material for an electromagnetic dark room. Since the maximum width of currently available amorphous alloy ribbons is about 20 cm, a step such as soldering was required for widening, but such a step can be omitted.

[Brief description of drawings]

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

FIG. 2 is a diagram showing the relationship between the depth (d ₀ ) of a rectangular recess at the bottom of a nozzle and the streak defect occurrence rate on the ribbon roll surface according to the method of the present invention.

FIG. 3 is a diagram showing the relationship between the lengths (d ₁ , d ₂ ) of the rectangular recesses in the lower portion of the nozzle in the cooling substrate moving direction and the streak defect occurrence rate on the ribbon roll surface according to the method of the present invention.

FIG. 4 is a schematic diagram showing an example in which an upper nozzle having a plurality of parallelogram-shaped openings and a lower nozzle having a rectangular opening are separated.

FIG. 5 is a schematic view of a conventional porous nozzle for producing a metal ribbon (parallelogram shaped opening).

FIG. 6 is a schematic view of a conventional multi-hole nozzle for producing a metal ribbon (trapezoidal opening).

FIG. 7 is a schematic diagram illustrating a nozzle (trapezoidal opening) of the present invention.

FIG. 8 is a schematic view showing a single roll rapid solidification ribbon production apparatus.

FIG. 9 is an enlarged schematic diagram for explaining a state of casting using a single roll rapid solidification ribbon production apparatus.

FIG. 10 is a schematic diagram illustrating generation of streak defects when a conventional multi-hole nozzle for producing a metal ribbon is used.

FIG. 11 is a schematic diagram showing how a conventional rectangular hole nozzle for producing a metal ribbon is deformed by thermal expansion.

[Explanation of symbols]

1 Dimple provided on the side of the nozzle facing the cooling substrate 1X Front edge of the dimple provided on the side of the nozzle facing the cooling substrate 1Y Rear edge of the dimple provided on the side facing the cooling substrate of the nozzle 1Z Cooling substrate of the nozzle Side edge of the recess provided on the side opposite to 2 parallelogrammatic opening 2'provided on the nozzle 2'small triangular opening provided on both ends of the nozzle 2X front end of the opening provided on the nozzle 2Y rear end of the opening provided on the nozzle 2 ' Z Outer end of the opening provided in the nozzle 3 Nozzle 4 Cooling roll 5 Thin strip 6 Melting sample 7 Heating device 8 Crucible 9 Integrated paddle 10 Dimple behind paddle 11 Streak defect

Claims (4)

[Claims] 1. A plurality of parallelogram or trapezoidal openings,
Arranged substantially at right angles to the moving direction of the cooling substrate, triangular openings are provided at both ends of the opening row, and further, at least on the side facing the cooling board, at least over the entire opening and the opening space. A metal ribbon, which is characterized in that a nozzle provided with a recess having a depth of 10 is provided so as to face a cooling substrate, and a molten sample of a metal or an alloy is jetted from the nozzle onto the surface of the cooling substrate to rapidly solidify. Method. 2. A depression provided on the side of the nozzle facing the cooling substrate has a depth d ₀ of 0.05 mm or more from the surface of the nozzle facing the cooling substrate, and the front ends of the plurality of openings of the nozzle in the cooling substrate moving direction. length d ₂ from the length d ₁ and the rear end to the leading edge to the trailing edge of the recess of the recess from both is less than 3mm, further, the outer end of the opening of the top ends of the plurality of openings of the nozzle The method for producing a metal ribbon according to claim 1, wherein lengths d ₃ and d ₄ from the side to both side edges of the depression are both 1 mm or less. 3. A height a is 0.5 to 8.0 mm, a base length b is 0.1 to 2.0 mm, a distance c between adjacent openings is 0.2 to 3.0 mm, and a cooling substrate is moved. A plurality of parallelogram-shaped openings having an inclination of 10 ° to 80 ° with respect to the direction perpendicular to the direction are arranged substantially at right angles to the moving direction of the cooling substrate, and the height of the parallelogram-shaped openings is arranged at both ends of the opening row. Has a small triangular opening having a height approximately half the height a, and
Only on the side facing the cooling substrate, the depth d ₀ from the surface of the nozzle facing the cooling substrate is 0.05 mm or more, and the length d from the front end of the plurality of openings of the nozzle in the cooling substrate moving direction to the front edge of the depression. ₁ and the length d ₂ from the rear end to the rear edge of the recess is
Each has a recess of 3 mm or less, and further, the lengths d ₃ and d ₄ from the outer ends of the openings at both ends of the plurality of openings of the nozzle to both side edges of the recess are both 1 mm or less. A characteristic nozzle for producing metal ribbon. 4. A height a of 0.5 to 8.0 mm, a bottom length b ₁ of 0.5 to 5.0 mm, and a top length b ₂ of 0.1.
2.0 mm, distance c between adjacent openings is 0.2 to 3.0
mm trapezoidal openings are arranged substantially at right angles to the moving direction of the cooling substrate, and the plurality of openings are arranged so that adjacent openings and a part thereof overlap in the moving direction. Triangles having the height of the trapezoidal openings at both ends of the row of openings and arranged so that the total length of the openings in the direction is a direction perpendicular to the movement direction and has substantially the same length over the range in which the openings exist. It has a small opening in shape,
Further, only on the side facing the cooling substrate, the depth d ₀ from the surface facing the cooling substrate of the nozzle is 0.05 mm or more, and the length from the front end of the plurality of openings of the nozzle in the cooling substrate moving direction to the front edge of the depression. D ₁ and the length d from the rear end to the rear edge of the recess
₂ is 3 mm or less, and further, the lengths d ₃ and d ₄ from the outer ends of the outermost ends of the plurality of openings of the nozzle to both side edges of the depression are both 1 mm or less. A nozzle for producing a metal ribbon, characterized by having.