Nanocrystalline alloy flake manufacturing method and nanocrystalline alloy flake manufacturing device

Abstract

To provide a nanocrystal alloy piece manufacturing method that has high productivity, hardly causes die galling and hardly causes distortion, breakage and cracking.SOLUTION: A nanocrystal alloy piece manufacturing method comprises: a processing groove formation step in which a recessed part acting as a punching outline in a predetermined shape is formed on a surface of an amorphous alloy ribbon; a heat-treatment step in which the amorphous alloy ribbon is moved while contacting the ribbon with a heated convex surface and a portion contacting the convex surface of the amorphous alloy ribbon is moved while being pressed against the convex surface from the opposite side of the portion contacting thereto; and a punching-out step in which the ribbon is punched out, along the punching outline, into a nanocrystal alloy piece in the predetermined shape.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing nanocrystalline alloy flakes, in which an amorphous alloy ribbon is processed into nanocrystalline alloy flakes of a predetermined shape. [Background technology]

[0002] Amorphous alloys are known to exhibit excellent mechanical properties, magnetic properties, corrosion resistance, etc., even when they have the same composition as regular crystalline alloys. In particular, Fe-based and Co-based amorphous alloys are known to be able to be made into soft magnetic materials with low coercive force because they do not form grain boundaries. To produce amorphous alloys, the molten alloy must be rapidly cooled and solidified to prevent the formation of crystal grains in the alloy. For example, the molten alloy is supplied to the surface of a rotating chill roll and continuously solidified on the roll surface. This manufacturing method, called the single-roll method, produces a ribbon-shaped amorphous alloy. It is also known that a toroidal core made of a ribbon-shaped amorphous alloy can be easily produced.

[0003] Although amorphous alloys are expected to be widely used in motor stator cores and rotor cores, their complex shapes make it difficult to form them into toroidal cores. Therefore, a method has been applied in which amorphous alloy ribbons are punched into a predetermined shape to form amorphous alloy pieces, and these amorphous alloy pieces are then stacked to form a core (for example, Patent Document 1).

[0004] Some amorphous alloys can be nanocrystallized by heat treatment to improve their saturation magnetic flux density. However, nanocrystallized ribbons become brittle, making them difficult to punch into the desired shape using conventional punching equipment. The only options are low-productivity processing methods such as laser processing and wire electrical discharge machining.

[0005] Another method is to form the amorphous alloy into the desired shape by standard punching before heat treatment, and then heat treat it to nanocrystallize it. If the alloy is heat treated without restraint, distortion occurs in the thickness direction, and forcing it back to a flat shape during lamination can cause cracking, or the magnetic properties can deteriorate due to stress generated within the nanocrystalline alloy.

[0006] One method for suppressing distortion due to heat treatment is to sandwich the material between two heated plates. In this case, handling the individual pieces punched into a predetermined shape one by one is poor productivity, so a method has been proposed in which the material is heat treated in a partially connected ribbon state, and the connected parts are cut off after the heat treatment to form individual pieces (Patent Document 2). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-219613 [Patent Document 2] Japanese Patent Publication No. 2020-120426 Summary of the Invention [Problem to be solved by the invention]

[0008] The method described in Patent Document 2 requires cutting the nanocrystalline alloy, which has been embrittled by the heat treatment, to separate it into individual pieces of a predetermined shape after heat treatment. Cracks and fissures occur during cutting, making it difficult to obtain the desired shape. Furthermore, the cracks that occur during cutting can expand and extend due to vibrations and other factors when the nanocrystalline alloy is used as a product. Furthermore, when cutting by punching, chips generated during cutting can get caught in the gaps in the mold, causing mold seizing.

[0009] Therefore, the present invention provides a method for producing nanocrystalline alloy flakes that is highly productive, is less susceptible to die galling, and has less distortion, cracking, and chipping. [Means for solving the problem]

[0010] The method for producing nanocrystalline alloy flakes of the present invention includes a process of forming a groove on the surface of an amorphous alloy ribbon, which is a recessed groove that will become a punched outline of a predetermined shape; a process of moving the amorphous alloy ribbon while bringing it into surface contact with a heated convex surface, and moving the portion of the amorphous alloy ribbon that is in contact with the convex surface from the opposite side of the surface that is in surface contact with the convex surface. Through a flexible member a heat treatment step of pressing and moving the amorphous alloy ribbon to nanocrystallize the amorphous alloy ribbon by heat treatment; and a punching step of punching the amorphous alloy ribbon along the punching contour line. of It is characterized by having:

[0011] In addition, the heat treatment step In , the abutting portions of the amorphous alloy ribbons The suppression of , via a flexible member do It is preferable.

[0012] Also 、 The flexible member is preferably heated.

[0013] The flexible member is preferably a metal member.

[0015] In addition, the processed groove formation Preferably, the recess is formed by pressing with a stamping jig.

[0016] It is also preferable to heat the marking jig.

[0017] The nanocrystalline alloy flake manufacturing apparatus of the present invention is a nanocrystalline alloy flake manufacturing apparatus, which comprises an imprinting mechanism for forming a recessed processing groove on the surface of an amorphous alloy ribbon that will become a punched outline of a predetermined shape, and a mechanism for moving the amorphous alloy ribbon while bringing it into surface contact with a heated convex surface, and a mechanism for moving the portion of the amorphous alloy ribbon that abuts against the convex surface from the opposite side of the surface that is in surface contact with the convex surface. Through a flexible memberThe apparatus includes a heat treatment mechanism that moves while pressing, and a punching mechanism that punches out the nanocrystalline alloy piece of the predetermined shape along the punching contour line. [Effects of the Invention]

[0019] According to the present invention, it is possible to produce nanocrystalline alloy flakes with high productivity, with little die galling, and with little distortion, cracking or chipping. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a conceptual diagram of a nanocrystalline alloy flake manufacturing apparatus according to the present embodiment. [Figure 2] 1 is a flowchart showing the procedure for producing nanocrystalline metal pieces from an amorphous alloy ribbon in this embodiment. [Figure 3] 2A and 2B are cross-sectional conceptual diagrams of the marking mechanism 22 that forms plastically worked grooves in the amorphous alloy ribbon shown in Fig. 1. (a) shows the state at the start of marking, and (b) shows the state after marking is completed. [Figure 4] FIG. 2 is a conceptual diagram of a heat treatment mechanism 24 for converting the amorphous alloy ribbon shown in FIG. 1 into a nanocrystalline alloy. [Figure 5] (a) shows the imprinted state of the amorphous alloy ribbon before heat treatment in the heat treatment mechanism shown in Figure 4. (b) shows the imprinted state of the nanocrystalline metal alloy ribbon after heat treatment in the heat treatment mechanism shown in Figure 4. [Figure 6] 2 is a conceptual diagram of another embodiment of the heat treatment mechanism 24 for converting the amorphous alloy ribbon shown in FIG. 1 into a nanocrystalline alloy. [Figure 7] 2A and 2B are cross-sectional conceptual diagrams showing one embodiment of a punching mechanism 25 that separates nanocrystalline alloy pieces along the plastically worked grooves shown in Fig. 1. (a) shows the state at the start of punching, and (b) shows the state at the end of punching. [Figure 8] 2A and 2B are cross-sectional conceptual diagrams showing one embodiment of a punching mechanism 25 that separates nanocrystalline alloy pieces along the plastically worked grooves shown in Fig. 1. (a) shows the state at the start of punching, and (b) shows the state at the end of punching. [Figure 9]2A and 2B are cross-sectional conceptual diagrams showing one embodiment of a punching mechanism 25 that separates nanocrystalline alloy pieces along the plastically worked grooves shown in Fig. 1. (a) shows the state at the start of punching, and (b) shows the state at the end of punching. [Figure 10] 1. (a) is a cross-sectional view of the side of the device showing the state during punching. (b) is a cross-sectional view of the side of the device showing the state of (a) from the transport direction of the nanocrystalline alloy ribbon. [Figure 11] The overall appearance of the punched nanocrystalline alloy piece and an enlargement of the cut area are shown. [Figure 12] The overall appearance of the punched nanocrystalline alloy ribbon and an enlargement of the cut area are shown. [Figure 13] The cut surface of the punched nanocrystalline alloy piece is shown as seen from the front. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of a nanocrystalline alloy flake manufacturing apparatus 20 for cutting nanocrystalline alloy flakes of a predetermined shape from an amorphous alloy ribbon 1a. The material of the amorphous alloy ribbon 1a is not particularly limited. For example, it can be applied to Fe-based nanocrystalline alloys such as Fe-Si-B-Nb-Cu and Fe-Si-B-Nb-Cu-Ni nanocrystalline alloys, which are nanocrystalline soft magnetic materials. Fe-based nanocrystalline alloys have a composition that crystallizes nanocrystals when the amorphous alloy ribbon is heat-treated.

[0022] As shown in FIG. 1, the nanocrystalline alloy flake manufacturing apparatus 20 includes an unwinding mechanism 21, a marking mechanism 22, a transport mechanism 23, a heat treatment mechanism 24, a punching mechanism 25, and a winding mechanism 26.

[0023] The unwinding mechanism 21 can be fitted with the amorphous alloy ribbon 1a wound in a roll, and by cooperative motion with the transport mechanism 23, unwinds and transports the amorphous alloy ribbon 1a.

[0024] 3(a), the marking mechanism 22 has a marking jig (hereinafter referred to as an anvil 221 and a marking punch 222), and forms a recess (hereinafter referred to as a plastically worked groove 2) along the outline of a nanocrystalline alloy piece of a predetermined shape to be cut out by pressing the marking punch 222 against the surface of the amorphous alloy ribbon 1a. The marking punch 222 that forms the plastically worked groove 2 does not need to be movable up and down, and may be, for example, a highly productive continuous marking method using a rotary blade and an anvil roll.

[0025] In the heat treatment mechanism 24, the amorphous alloy ribbon 1a is moved while being brought into contact with the heated convex surface, and the heat treatment causes microcrystallization of the amorphous alloy ribbon 1a, turning it into a nanocrystalline alloy ribbon 1b. The heat treatment mechanism 24 has a portion where the amorphous alloy ribbon 1a comes into contact and a pressing portion that presses against the convex surface from the opposite side of the contact surface. For example, as shown in Figure 4, it is composed of band members, such as two heating rolls 241a that pull a metal belt 242, and a heating roll 241b against which the pulled metal belt 242 is pressed, so that the amorphous alloy ribbon 1a can be placed between the heating rolls 241b and the metal belt 242.

[0026] Here, the "contact surface" means that the amorphous alloy ribbon and the convex surface are in contact with each other. The "convex surface" means a surface that is raised toward the amorphous ribbon, and may have any shape that allows the amorphous ribbon to follow and ensure sufficient contact, such as the curved surface of the side of a cylindrical (cylinder) shape like the heating rolls 241a and 241b shown in Figure 4, or a curved surface that is formed as part of a component like the curved surface of a semi-cylindrical component.

[0027] The band member may be any member that can be moved via a roll. In particular, a flexible member is preferable as the band member, and a metal member is more preferable in terms of flexibility, strength, and heat resistance. The metal belt 242 shown in Fig. 4 is an example of the band member.

[0028] When the amorphous alloy ribbon 1a is an Fe-based nanocrystalline alloy, the heating temperatures of the heating rolls 241a and 241b are preferably 500°C or higher so that the amorphous alloy ribbon 1a can be heated to the nanocrystallization temperature or higher. In addition, considering the heat loss due to radiation from the metal belt 242, the surface temperature of the two heating rolls 241a is preferably higher than the surface temperature of the heating roll 241b, and in the case of an Fe-based nanocrystalline alloy, for example, 550°C or higher is more preferable.

[0029] 7, the punching mechanism 25 is composed of a punch 251, a die 252, a lower presser foot 253, and an upper presser foot 254. In the punching mechanism 25, the nanocrystalline alloy ribbon 1b after the heat treatment is punched along the plastic processing grooves 2 on the surface of the nanocrystalline alloy ribbon 1b, and nanocrystalline alloy pieces 1c of a predetermined shape can be cut out.

[0030] As shown in Figure 8, the punching mechanism 25 can also punch out the nanocrystalline alloy flakes 1c without using the lower presser foot 253. Also, as shown in Figure 9, it is also possible to punch out the nanocrystalline alloy flakes 1c using an elastic punch 255 with an elastic body at the tip. Alternatively, as shown in Figure 10, it is also possible to press an elastic rotating roll 256 having an elastic body on its outer periphery against a rotating die roll 257 having a concave surface that matches the contour of the plastically worked groove 2, and sandwich the nanocrystalline alloy ribbon 1b between them to punch out the nanocrystalline alloy flakes 1c.

[0031] The winding mechanism 26 winds up the nanocrystalline alloy ribbon 1b into a roll after the punching mechanism 25 has cut out the nanocrystalline alloy pieces 1c of a predetermined shape.

[0032] Next, a method for producing nanocrystalline alloy flakes in nanocrystalline alloy flake production apparatus 20 according to this embodiment will be described with reference to the flow diagram in FIG.

[0033] (preparation) The amorphous alloy ribbon 1a wound in a roll shape is attached to an unwinding mechanism 21. The amorphous alloy ribbon 1a used is an Fe-based nanocrystalline alloy such as an Fe-Si-B-Nb-Cu system or an Fe-Si-B-Nb-Cu-Ni system, which becomes a nanocrystalline alloy by heat treatment. The amorphous alloy ribbon 1 a attached to the unwinding mechanism 21 is unwound and transported by coordinated motion with the transport mechanism 23 .

[0034] (Processed groove forming process) In the processed groove forming process, a recess that becomes a punched outline of a predetermined shape is formed on the surface of the amorphous alloy ribbon. In this embodiment, a stamping mechanism 22 forms a plastic processed groove 2 as a recess on the surface of the amorphous alloy ribbon 1a. Details of the processed groove forming process will be explained using Figure 3. With the amorphous alloy ribbon 1a placed at the tip of the anvil 221, the tip of a stamping punch 222 having a punched outline of a predetermined shape is pressed against the surface of the amorphous alloy ribbon 1a with a predetermined load, thereby forming a plastic processed groove 2 that becomes a punched outline of a predetermined shape.

[0035] Here, although it is possible to form the processed grooves by using the anvil 221 and stamping punch 222 at room temperature as shown in this embodiment, it is also useful to heat the anvil 221 and stamping punch 222 and instantaneously heat the amorphous alloy ribbon 1a during stamping. This is because the amorphous alloy ribbon 1a softens when heated, which reduces the pressure required for stamping and makes it possible to extend the life of the anvil and stamping punch.

[0036] The heating temperature of the anvil 221 and the stamping punch 222 is preferably within the temperature range that corresponds to the softening point of the amorphous alloy ribbon 1a, for example, in the case of an Fe-based nanocrystalline alloy, 390°C or higher and 430°C or lower. Here, the softening point refers to the temperature at which an amorphous solid substance that does not have a clear melting point softens and begins to deform, and generally varies depending on the composition. The amorphous alloy ribbon 1 a with the plastically worked grooves 2 formed therein is sent to a heat treatment mechanism 24 .

[0037] In this embodiment, the plastically worked grooves 2 are formed by pressing using an anvil and an engraving punch, but the recesses may also be formed using a laser, for example.

[0038] (Heat treatment process) In the heat treatment step, the amorphous alloy ribbon is moved while being brought into contact with the heated convex surface, and the portion of the amorphous alloy ribbon that is in contact with the convex surface is moved while being pressed against the convex surface from the opposite side of the contact surface, thereby nanocrystallizing the amorphous alloy ribbon through heat treatment. Microcrystallization occurs in the amorphous alloy ribbon 1a through heat treatment, and the amorphous alloy ribbon becomes a nanocrystalline alloy ribbon 1b.

[0039] Here, simply applying heat to the amorphous alloy ribbon 1a causes deformation such as wrinkles in the ribbon due to structural changes caused by nanocrystallization, so it is necessary to perform heat treatment while restraining the ribbon in some way. In this embodiment, a method of restraining the ribbon by sandwiching it between heating rolls 241b and metal belts 242 from above and below will be described with reference to Figure 4.

[0040] In the preceding process, the groove formation process, which involves imprinting from one side of the amorphous alloy ribbon 1a, results in secondary deformation in the thickness direction around the plastically worked groove 2. However, by sandwiching the ribbon from above and below between the heating roll 241b and the metal belt 242, the deformation around the plastically worked groove 2 is pushed back, allowing the entire ribbon to be heat-treated in a state where it is in uniform contact with the heating plate. Furthermore, if the deformation around the plastically worked groove 2 is not suppressed, there is a possibility that some parts will not come into contact with the heating plate. In contrast, by sandwiching the ribbon from above and below between the heating roll 241b and the metal belt 242, it is possible to avoid the problem of non-uniform nanocrystallization.

[0041] As shown in Figure 4, the amorphous alloy ribbon 1a moved to the heat treatment mechanism 24 is heat-treated by being sandwiched between a metal belt 242 heated by a heating roll 241a and a heating roll 241b and transported, becoming a nanocrystalline alloy ribbon 1b. At this time, the deformation of the amorphous alloy ribbon 1a around the plastic processing groove 2 is corrected by the clamping force between the metal belt 242 and the heating roll 241b and the softening caused by heating, and in the state of the nanocrystalline alloy ribbon 1b after heat treatment, the part other than the plastic processing groove 2 becomes flat. Thereafter, the heat-treated amorphous alloy ribbon 1 b is sent to a punching mechanism 25 .

[0042] As an example of the change in the deformation state before and after heat treatment, the change in a circular plastically worked groove with a diameter of 9.3 mm is shown in Figure 5. Figure 5(a) shows the state before heat treatment, and Figure 5(b) shows the state after heat treatment. In Figure 5(a), reflections and distortions in the background due to deformation can be seen, but these reflections and distortions are eliminated after passing through the heat treatment mechanism of this embodiment.

[0043] In this embodiment, a mechanism is used in which the amorphous alloy ribbon 1a is sandwiched between the heating roll 241b and the metal belt 242 from above and below, but this is not limited to the example shown above, as long as it is possible to suppress deformation such as wrinkles in the ribbon due to structural changes caused by nanocrystallization, correct deformation during plastic processing in the processing groove formation process, and provide uniform heating. For example, a heat treatment mode in which the ribbon is sandwiched between two heating elements as shown in Figure 6 is possible.

[0044] (Punching process) The heat-treated nanocrystalline alloy ribbon 1b is punched in a punching mechanism 25 along the plastically worked grooves 2 on the surface of the nanocrystalline alloy ribbon 1b, and nanocrystalline alloy pieces 1c of a predetermined shape are cut out.

[0045] The punching step will be described in detail with reference to FIG. 7, which is a schematic cross-sectional view. After the heat treatment process, the nanocrystalline alloy ribbon 1b is placed on the die 252 and lower presser 253 so that the position of the plastically worked groove 2 is in the gap between the die 252 and lower presser 253, and then it is sandwiched between the die 252 and upper presser 254 and fixed in position. At this time, if the nanocrystalline alloy ribbon 1b has any deformation remaining around the plastically worked groove 2 after imprinting in the imprinting process 22, it will crack when sandwiched, but in this embodiment, the deformation has been corrected and flattened by the heat treatment mechanism 24, so no cracks will occur when it is fixed.

[0046] When punch 251 comes into contact with lower pressure plate 253 facing each other and is pressed further in while receiving the reaction force of lower pressure plate 253, shear stress and tensile stress are generated in nanocrystalline alloy ribbon 1b located between the portion fixed by die 252 and upper pressure plate 254 and the portion fixed by punch 251 and lower pressure plate 253. Stress is concentrated at the bottom of plastically worked groove 2, and when it reaches its limit, nanocrystalline alloy ribbon 1b is cut by plastically worked groove 2, and nanocrystalline alloy pieces 1c of the desired shape are cut out.

[0047] Since the nanocrystalline alloy ribbon 1b is brittle, the cut surface of the nanocrystalline alloy piece 1c of a predetermined shape is a cleavage surface, and has the characteristic of being free of burrs at the edge. Because nanocrystalline alloy pieces are thin, they are often stacked together. In this case, if there are burrs on the edges, the thickness of the edges will be greater than that of the other parts, resulting in a bulged edge.

[0048] When using adhesive between layers to create a laminated component, it is possible to absorb burrs by increasing the thickness of the adhesive layer, but this reduces the volume ratio of nanocrystalline alloy in the laminated component and reduces magnetic properties. Another method involves sandwiching the top and bottom surfaces of the laminated component between flat plates to forcibly deform the burrs while adhesively fixing them, but the magnetic properties of nanocrystalline alloys deteriorate when stress is applied. In contrast, the nanocrystalline alloy pieces produced in this embodiment are burr-free, making it easier to obtain the desired laminated shape component while suppressing degradation of magnetic properties.

[0049] Generally, when punched using a punching mechanism, nanocrystalline alloy ribbons are brittle, resulting in frequent chipping and cracking. These chips and cracks do not fit within the clearance between the punch and die, but extend to the area between the punch and the lower pressure plate or the die and the upper pressure plate, making it difficult to obtain nanocrystalline alloy pieces with the desired shape. In this case, narrowing the clearance between the punch and the die tends to slightly approximate the desired shape, but conversely, this increases the likelihood that metal fragments generated during punching will get caught between the punch and the die, causing seizure.

[0050] Generally, the clearance between the punch and die during punching is about 3% to 20% of the material thickness. For example, if the thickness of a nanocrystalline alloy ribbon is 30 μm, the clearance is 0.9 to 6 μm. However, the metal pieces generated during punching include various sizes, so they can easily become jammed.

[0051] On the other hand, in this embodiment, the nanocrystalline alloy ribbon 1a has a plastically worked groove 2, and further, cleavage cuts are made along the plastically worked groove 2 during punching, so chipping and cracking are reduced, and nanocrystalline alloy pieces 1c of the desired shape can be obtained. Furthermore, since stress only needs to be concentrated at the bottom of the plastically worked groove, it is possible to ensure a large clearance between the punch 251 and the die 252. While the generation of metal fragments is significantly less than when the plastically worked groove 2 is absent, a large clearance prevents metal fragments from getting caught between the punch 251 and the die 252. Furthermore, there is more room for positioning accuracy when placing the plastically worked groove 2 in the clearance during punching.

[0052] When punching nanocrystalline alloy piece 1c with punching mechanism 25, conditions such as the mechanical properties of nanocrystalline alloy ribbon 1b, the shape of nanocrystalline alloy piece 1c, the shape of plastically worked groove 2, the size of the clearance between punch 251 and die 252, and the punch descent speed during punching can be adjusted appropriately. For example, if the thickness of the nanocrystalline alloy ribbon is 30 μm, and the groove depth of plastically worked groove 2 is 20 μm or more, punching is possible even with a clearance of 100 μm between punch 251 and die 252.

[0053] As shown in Figure 10, when an elastic rotating roll 256 having an elastic body on its outer periphery is pressed against a rotating die roll 257 having a concave surface that matches the contour of the plastically processed groove 2, and a nanocrystalline alloy ribbon 1b is sandwiched between them to punch out nanocrystalline alloy pieces 1c, continuous punching is possible due to the rotation method, and high productivity can be expected.

[0054] In the case of the rotation method illustrated in Figure 10, after the bottom of the plastically worked groove 2 first sandwiched between the elastic rotating roll 256 and the rotating die roll 257 cleaves and fractures, the crack propagates to the bottom of the remaining plastically worked grooves 2 as the nanocrystalline alloy ribbon 1b is transported, completing the punching of the nanocrystalline alloy flakes 1c. On the other hand, in punching methods other than that shown in Figure 10, as the punch or elastic body is pressed in, pressure is applied to the entire bottom of the plastically worked groove 2, and as soon as the weakest part cleaves and fractures, the crack propagates to the bottom of the other plastically worked grooves 2, completing the punching of the nanocrystalline alloy flakes 1c. [Example]

[0055] An example (Example) will be described in which a circular plastically worked groove having a diameter of 9.3 mm is punched out by a punching mechanism on the cut surface of a nanocrystalline alloy piece 1c punched out according to this embodiment. The thickness of the nanocrystalline alloy ribbon used before punching was 30 μm, and the groove depth was measured at four points and ranged from 16.2 to 22.2 μm, with an average of 19.1 μm. In this example, the configuration shown in Figure 7 was used, and the clearance between the punch 251 and the die 252 was 100 μm. Figures 11 and 12 show the overall appearance of the punched nanocrystalline alloy piece and the punched ribbon, respectively, and an enlarged view of the cut area. It can be seen that both the punched nanocrystalline alloy piece and the punched ribbon were cut along the plastic processing groove. The appearance of the cut surface is shown in Figure 13. It can be seen that the cut was made by cleavage and that there are no burrs on the edges of the cut surface. Therefore, the method for manufacturing nanocrystalline alloy flakes in this embodiment makes it possible to suppress the occurrence of distortion, cracks, and chipping, and to make it less likely for mold galling to occur.

[0056] As described above, according to the present invention, nanocrystalline alloy flakes, which are difficult to manufacture due to their brittleness, can be manufactured with high productivity.

[0057] Although the present invention has been described above using the above embodiment, the technical scope of the present invention is not limited to the above embodiment. [Explanation of symbols]

[0058] 1a: Amorphous alloy ribbon 1b: Nanocrystalline alloy ribbon 2: Plastic processing groove 20: Nanocrystalline alloy flake manufacturing equipment 21: Unwinding mechanism 22: Engraving mechanism 23:Transport mechanism 24, 24a, 24b: Heat treatment mechanism 25, 25a, 25b, 25c: punching mechanism 26: Winding mechanism 221: Anvil 222: Engraving punch 241a, 241b: heating roll 242: Metal Belt 243a, 243b: heating element 251: Punch 252: Die 253: Lower pressure 254: Upper press 255, 255a, 255b: Elastic punch 256, 256a, 256b: Elastic rotating roll 257: Rotary die roll

Claims

1. a groove forming step of forming a groove in the surface of the amorphous alloy ribbon, the groove being a recess having a predetermined shape that will become a punched outline; a heat treatment process in which the amorphous alloy ribbon is moved while being brought into surface contact with a heated convex surface, and the portion of the amorphous alloy ribbon that abuts against the convex surface is moved while being pressed against the convex surface from the opposite side of the surface that is in surface contact with the amorphous alloy ribbon via a flexible member, thereby nano-crystallizing the amorphous alloy ribbon by heat treatment; a punching step of punching the amorphous alloy ribbon along the punching contour line; A method for producing nanocrystalline alloy flakes, comprising:

2. The method for producing nanocrystalline alloy flakes according to claim 1, further comprising heating the flexible member.

3. 3. The method for producing nanocrystalline alloy flakes according to claim 1, wherein the flexible member is a metal member.

4. The method for producing nanocrystalline alloy flakes according to any one of claims 1 to 3, characterized in that the recesses are formed in the processing groove forming step by pressing with a stamping jig.

5. The method for producing nanocrystalline alloy flakes according to claim 4, wherein the stamping jig is heated.

6. In the nanocrystalline alloy flake manufacturing apparatus, an imprinting mechanism for forming a recessed groove on the surface of the amorphous alloy ribbon, the recessed groove being a punched outline of a predetermined shape; a heat treatment mechanism that moves the amorphous alloy ribbon while bringing it into surface contact with a heated convex surface, and that moves the amorphous alloy ribbon while pressing the portion of the amorphous alloy ribbon that is in contact with the convex surface against the convex surface from the opposite side of the surface that is in surface contact with the amorphous alloy ribbon via a flexible member; a punching mechanism for punching the nanocrystalline alloy piece of the predetermined shape along the punching contour line; An apparatus for producing nanocrystalline alloy flakes, comprising:

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