Method for manufacturing cut piece of multilayer amorphous alloy ribbon

Abstract

To provide a method for manufacturing a cut piece of a multilayer amorphous alloy ribbon, which can suppress tearing or cracking of the cut piece of the multilayer amorphous alloy ribbon and is advantageous for ensuring productivity.SOLUTION: The method for manufacturing a cut piece of a multilayer amorphous alloy ribbon in which a plurality of laminated amorphous alloy ribbons are interlayer-joined comprises a step of applying a pulse laser having a pulse width of less than nano-seconds to the multilayer amorphous alloy ribbon to process it into the cut piece.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for producing a cut piece of a multilayer amorphous alloy ribbon in which a plurality of amorphous alloy ribbons are interlayer-bonded with a resin. [Background technology]

[0002] Fe-based or Co-based amorphous alloys and nanocrystalline materials having a nanocrystalline structure can be produced as thin strips of amorphous alloys by, for example, the single-roll method, in which a molten alloy is supplied to the surface of a rotating chill roll and continuously solidified on the roll surface.

[0003] In recent years, active investigations have been made into the use of amorphous alloy ribbons formed into a predetermined shape, laminated together, and used in laminated cores for rotating machines.

[0004] Processing techniques for obtaining amorphous alloy ribbon pieces, which are cut pieces, from an amorphous alloy ribbon include mechanical processing such as punching and shearing (for example, Patent Document 1) and laser processing. However, most amorphous alloy ribbons, such as Fe-based amorphous alloy ribbons, have a Vickers hardness of more than 800 Hv. When the amorphous alloy ribbon is repeatedly punched, the high hardness causes severe wear of the punching die. Furthermore, although shear cutting allows amorphous alloy ribbons to be processed relatively easily, it is limited to relatively simple shapes and is difficult to apply to complex shapes such as motor cores. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-219613 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, the present inventors attempted to apply a method of processing single sheets of electrical steel sheets using an ultrashort pulse laser and stacking the processed products. However, when simply applying this method, they encountered the problem of the generation of cracks, such as fissures, in the amorphous alloy ribbon due to the heat generated by the laser output. Furthermore, to reduce the heat generated by the laser output, it is necessary to reduce the oscillation frequency of the laser pulse (i.e., to lengthen the interval between pulses). When processing is performed with a reduced oscillation frequency, the scanning speed must be slowed down to maintain the pulse interval during processing. In other words, avoiding the heat generated by the laser output results in a longer processing time, which is a problem that reduces productivity.

[0007] In view of the above problems, the present invention aims to provide a method for manufacturing cut pieces of a multilayer amorphous alloy ribbon that is advantageous in terms of suppressing cracks from occurring in the cut pieces of the multilayer amorphous alloy ribbon and ensuring productivity. [Means for solving the problem]

[0008] A method for manufacturing a cut piece of a multilayer amorphous alloy ribbon in which a plurality of amorphous alloy ribbons are interlayer-bonded with a resin, the method comprising the step of irradiating the multilayer amorphous alloy ribbon with a pulse laser having a pulse width of less than a nanosecond to process the multilayer amorphous alloy ribbon into the cut piece. Furthermore, it is preferable that the scanning speed of the pulse laser is 5000 mm / s or more. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a method for manufacturing cut pieces of a multilayer amorphous alloy ribbon, which is advantageous in suppressing cracks from occurring in the cut pieces of the multilayer amorphous alloy ribbon and in ensuring productivity. [Brief explanation of the drawings]

[0010] [Figure 1] 10 is a laser microscope photograph showing the top surface of a cut piece in one example. [Figure 2] 2 is a laser microscope photograph showing the front of the laser-processed surface in the example shown in FIG. 1. [Figure 3] This is a laser microscope photograph showing the front of a laser-processed surface processed with a millisecond laser. [Figure 4] 1 is a laser microscope photograph showing the front surface of a laser-processed surface processed with a nanosecond laser. [Figure 5] 2 shows a profile illustrating a cross section of a laser-processed surface in the embodiment shown in FIG. 1. [Figure 6] 10 is a laser microscope photograph showing the front surface of a laser-processed surface in another example. [Figure 7] 10 is a laser microscope photograph showing the front surface of a laser-processed surface in another example. [Figure 8] 10 is a laser microscope photograph showing the front surface of a laser-processed surface in another example. [Figure 9] 9 shows a profile illustrating a cross section of a laser-processed surface in the embodiment shown in FIG. 8. [Figure 10] 10 is a laser microscope photograph showing the top surface of a cut piece in a comparative example. [Figure 11] 11 is a laser microscope photograph showing the front surface of the laser-processed surface in the comparative example shown in FIG. 10. [Figure 12] 1A and 1B are schematic diagrams of a cut piece of a multilayer amorphous alloy ribbon obtained in an embodiment of the present invention and a schematic diagram showing a front view of a laser-processed surface of the cut piece. DETAILED DESCRIPTION OF THE INVENTION

[0011] The following describes in detail the embodiments of the present invention, but the present invention is not limited to these embodiments.

[0012] One embodiment of the present invention is a method for manufacturing a cut piece of a multilayer amorphous alloy ribbon in which a plurality of amorphous alloy ribbons are interlayer-bonded with a resin, the method comprising the step of irradiating the multilayer amorphous alloy ribbon with a pulse laser having a pulse width of less than nanoseconds to process the cut piece. By processing the amorphous alloy ribbon interlayer-bonded with a resin (multilayer amorphous alloy ribbon) with an ultrashort pulse laser having a pulse width of less than nanoseconds, it is possible to obtain a cut piece of the multilayer amorphous alloy ribbon in which cracks such as fissures and breaks are suppressed. Here, the cut piece includes not only pieces of a simple shape obtained by cutting, but also pieces obtained by shaping, such as by hollowing out a specific shape.

[0013] When an amorphous alloy ribbon is cut with an ultrashort pulse laser, plasma is generated near the processing point due to laser irradiation during processing, and the heat of the plasma causes melting and solidification at the processed area, resulting in distortion, and as a result, the amorphous alloy ribbon is deformed and cracks are generated. On the other hand, in the case of a multilayer amorphous alloy ribbon in which multiple amorphous alloy ribbons are bonded together with resin, no cracks are generated even when cutting with an ultrashort pulse laser of less than a nanosecond. This is thought to be because the adhesive restrains (holds) each layer of laminated material, suppressing deformation of the processed area due to heat generated by laser irradiation, i.e., distortion due to melting and solidification that occurs in a single sheet of amorphous alloy ribbon.

[0014] The present embodiment is considered to be widely applicable to a multilayer amorphous alloy ribbon in which a plurality of amorphous alloy ribbons are interlayer-bonded with a resin. For example, a typical amorphous alloy ribbon may be a ribbon-shaped Fe-based amorphous alloy having a width of 300 mm or less and a thickness of 50 μm or less, or an amorphous alloy for an Fe-based nanocrystalline alloy for use by precipitating nanocrystals. A typical Fe-based amorphous alloy may have a composition expressed as (Fe1-aMa)bSicBd (atomic %), where M is Co and / or Ni, and a, b, c, and d satisfy the following conditions: 0≦a≦0.3, 76≦b≦84, 1≦c≦12, and 8≦d≦18, respectively. Furthermore, a portion of the Fe may be substituted with elements such as C, P, S, and Ga in a range of 3 atomic % or less. Furthermore, a portion of the Fe may be substituted with elements such as Nb, W, Ta, Hf, Ti, V, Cr, and Mn in a range of 10 atomic % or less.

[0015] Furthermore, a typical amorphous alloy for Fe-based nanocrystalline alloys is an alloy having a composition represented by (Fe1-aMa)100-xyz-α-β-γCuxSiyBzM'αM"βXγ (atomic %), where M is Co and / or Ni, M' is at least one element selected from the group consisting of Nb, Mo, Ta, Ti, Zr, Hf, V, Cr, Mn, and W, M" is at least one element selected from the group consisting of Al, platinum group elements, Sc, rare earth elements, Au, Zn, Sn, and Re, and X is at least one element selected from the group consisting of C, Ge, P, Ga, Sb, In, Be, and As. Furthermore, a, x, y, z, α, β, and γ satisfy 0≦a≦0.5, 0.1≦x≦3, 0≦y≦30, 0≦z≦25, 5≦y+z≦30, 0≦α≦20, 0≦β≦20, and 0≦γ≦20, respectively. As mentioned above, the embodiments of the present invention are not limited to these composition ranges.

[0016] The amorphous alloy ribbon can be produced by various known methods, for example, by preparing a molten alloy having the above-mentioned composition, discharging the molten alloy onto the surface of a chill roll to form a film of the molten alloy on the surface of the chill roll, peeling the quenched alloy ribbon formed on the surface from the surface of the chill roll by blowing a peeling gas thereon, and winding it up into a roll on a take-up roll.

[0017] Amorphous alloy ribbons that have been heat-treated at high temperatures to a degree that does not cause crystallization in order to eliminate distortions that occur during casting are particularly effective as amorphous alloy ribbons for motors. Suitable methods for obtaining such amorphous alloy ribbons include, for example, a method of heat-treating the ribbon in a tensioned state (tension annealing), a method of heat-treating the ribbon in a state in which a magnetic field is applied in the ribbon's longitudinal direction, and a method of heat-treating the ribbon in a state in which a magnetic field is applied in the ribbon's longitudinal direction while being tensioned. A resin may be applied to the amorphous alloy ribbon that has been subjected to such heat treatment, and another amorphous alloy ribbon may be bonded to the amorphous alloy ribbon to form a multilayer amorphous alloy ribbon.

[0018] The type of resin used for interlayer bonding in this embodiment is not particularly limited. Typical resins can be selected from polyimide resins, epoxy resins, ketone resins, polyamide resins, nitrile resins, thioether resins, polyester resins, arylate resins, sulfone resins, imide resins, amide-imide resins, polyethylene resins, polypropylene resins, and the like. The resin of this embodiment is a resin composition containing at least one of these resins as a component. Other components may include a curing agent, and if necessary, other resins, curing accelerators, fillers, solvents, plasticizers, and the like. Among these, epoxy resins have the advantages of being highly heat-resistant, inexpensive, and readily available. One-component epoxy resins are particularly useful because they allow for easy management of the working environment and safety. Polyethylene resins also allow for easy removal of contaminants from the equipment used for lamination bonding, and are easy to store and manage.

[0019] The thickness of the resin when the ribbons are bonded together with a resin adhesive and then heat-treated is preferably 5.5 μm or less to obtain a space factor of 90% or more, and more preferably 1.0 to 2.5 μm to obtain a space factor of 95 to 98%.

[0020] Here, the space factor is a ratio indicating the extent to which the base material occupies the apparent dimensions of the laminate. In the case of a laminate using thin ribbons, the space factor SF (%) is expressed by the following formula, where t1 is the thickness of the thin ribbons, N is the number of stacked sheets, and t2 is the thickness of the laminate after stacking. (Equation 1) SF(%) = ((t1 × N) / t2) × 100%

[0021] The manufacturing method of the present embodiment is a method for manufacturing a cut piece of a multilayer amorphous alloy ribbon in which a plurality of amorphous alloy ribbons are interlayer-bonded with a resin, and includes a step of irradiating the multilayer amorphous alloy ribbon with a pulse laser having a pulse width of less than a nanosecond to process the multilayer amorphous alloy ribbon into the cut piece. Hereinafter, in this embodiment, the step of irradiating the multilayer amorphous alloy ribbon with a pulse laser having a pulse width of less than nanoseconds to process it into the cut pieces will also be referred to as a "laser processing step."

[0022] Here, an example of a manufacturing process of the multilayer amorphous alloy ribbon used in this embodiment will be described below. For example, before the laser processing step, the manufacturing process of the multilayer amorphous alloy ribbon may include a step of applying a resin to the amorphous alloy ribbon (hereinafter, abbreviated as a resin application step) and a step of stacking amorphous alloy ribbons and hardening the resin (hereinafter, abbreviated as a resin hardening step). These steps and the laser processing step can be performed consecutively, or a separately manufactured multilayer amorphous alloy ribbon may be subjected to the laser processing step.

[0023] (Resin application process) The resin coating step is a step of preparing two or more amorphous alloy ribbons and coating one or both surfaces of the amorphous alloy ribbons with resin.

[0024] Resin coating is a process of forming a resin layer by disposing a resin on one or both sides of an amorphous alloy ribbon. The method for forming the resin layer is not particularly limited, and examples thereof include a method of applying a resin by flexographic printing, or a method of preparing an adhesive containing a resin and a solvent, applying the adhesive by a spray or coater, and then evaporating the solvent. In particular, the method of forming a resin layer by applying a resin using flexographic printing is suitable when applying a thermosetting resin that does not contain a solvent.

[0025] (Resin curing process) The resin curing step is a step of laminating the resin-coated amorphous alloy ribbons and curing the resin to obtain a multi-layer amorphous alloy ribbon. The resin is cured by applying the resin, then placing another amorphous alloy ribbon on the surface of the amorphous alloy ribbon to which the resin has been applied, pressing them together with a roller or the like, and heating them to the curing temperature of the resin to cure it.

[0026] (Laser processing process) The laser processing step in this embodiment is a step of irradiating a surface of the multilayer amorphous alloy ribbon obtained through the multilayer amorphous alloy ribbon manufacturing step (one of the two main surfaces of the amorphous alloy ribbon present in the outermost layer of the laminated amorphous alloy ribbons that is not interlayer-bonded with resin) with a pulse laser having a pulse width of less than nanoseconds to process it into a predetermined shape, thereby obtaining cut pieces of the multilayer amorphous alloy ribbon from the multilayer amorphous alloy ribbon.

[0027] Here, there are no particular restrictions on the laser conditions in the laser processing step, but the preferred conditions are as follows.

[0028] The laser light source may be a YAG laser, a CO2 gas laser, a fiber laser, a diode laser, or the like.

[0029] The wavelength of the laser light is approximately 250 nm to 10600 nm depending on the laser light source.

[0030] The pulse width of the laser is preferably less than nanoseconds, more preferably 20 picoseconds or less, and even more preferably 5 picoseconds or less, because a shorter pulse width can reduce the thermal effect on the workpiece caused by laser irradiation.

[0031] The beam diameter of the laser light is preferably 60 μm or less. Although there are no particular limitations on the laser oscillation frequency or pulse energy, if the laser output power is the same, a higher oscillation frequency and lower pulse energy are preferable, as this reduces the thermal impact of laser irradiation on the workpiece.

[0032] There are no particular limitations on the laser irradiation (beam scanning) method used in the laser processing process. A galvanometer scanner, which uses a reflecting mirror to control the laser light in any direction, may be used for beam scanning. In this case, the laser beam can be focused on a plane using an fθ lens, and the beam diameter of the laser beam can be adjusted using a beam expander.

[0033] The scanning speed is preferably 5000 mm / s or more, and more preferably 10000 mm / s or more. This is because as the scanning speed increases and the laser pulse interval becomes longer, the amount of heat per unit area decreases, making it possible to reduce the thermal impact on the workpiece. [Example]

[0034] Examples relating to the embodiment of the present invention will be described below. Example 1 First, a nanocrystalline Fe-Si-B-Nb-Cu alloy ribbon was prepared by the single-roll method. The thickness was 28 μm and the width was 50 mm.

[0035] Next, resin was applied to the main surfaces of the amorphous alloy ribbons, and then the layers were laminated. After that, the resin was fully cured to produce five layers of amorphous alloy ribbons bonded together by the resin layer. An epoxy resin (Epiform manufactured by Somar Co., Ltd.) was used as the resin.

[0036] The laser light source was a YLPP-100-1-100-R (wavelength 1030 nm) manufactured by IPG Photonics, and the laser output was set to the maximum average output of 100 W, the pulse energy to 0.033 mJ, and the frequency to the maximum oscillation frequency of 2758 kHz. The pulse width was 1.8 ps.

[0037] Next, a galvanometer scanner manufactured by Raylase was prepared to scan the beam emitted from the laser light source, and the beam diameter was set to 0.037 mm using an fθ lens (f255 mm) manufactured by Sill Optics and a beam expander manufactured by Sigma Koki. The energy density was 3.07 J / cm2.

[0038] Next, the above-mentioned laser beam was irradiated onto the multilayer amorphous alloy ribbon, and cutting processing was performed with the beam scanning speed set to 7500 mm / s and the number of scans set to 310, thereby producing multiple samples (sample A, sample B, sample C, sample D) of cut pieces 1 of the multilayer amorphous alloy ribbon having the shape shown in Figure 12(a). The sample was a ring-shaped sample with an outer diameter of 40 mm and an inner diameter of 20 mm.

[0039] 12(a), the cut piece 1 has two surfaces (main surfaces), the surface irradiated with the laser is referred to as the upper surface 2, and the other surface is referred to as the lower surface 3. The outer diameter side surface cut by laser processing is referred to as the laser processed surface 4. 12(b) is a schematic diagram of the laser-processed surface 4 as viewed from the front, i.e., from the side surface on the outer diameter side of the cut piece 1. As can be seen from FIG. 12(b), the surface of the laser-processed surface 4 formed of the amorphous alloy ribbon is referred to as a ribbon layer surface 5, and the surface formed of the resin is referred to as a resin layer surface 6.

[0040] A laser microscope photograph of the top surface of sample A is shown in Figure 1. Here, the laser microscope used was an OSL-5000 manufactured by Evident, and the observation was carried out with a magnification of 1126x, a measurement size of 1032 x 1032 pixels, and a pixel size of 0.25 μm x 0.25 μm with a pitch of 0.24 μm. As can be seen from Figure 1, no cracks were found on the upper surface 2.

[0041] Figure 2 is a laser microscope photograph taken from the front of the laser-processed surface 4 of sample A. As can be seen from Figure 2, no cracks were found in the thickness direction (lamination direction) of the cut piece.

[0042] Furthermore, as can be seen from FIG. 2, no peeling of the resin used for interlayer bonding from the amorphous alloy ribbons constituting the multilayer amorphous alloy ribbon was observed. This is presumably because, when a laser with a pulse width of less than a nanosecond is used, multiphoton absorption occurs in the resin as well, the wavelength dependency of laser processing on the resin is eliminated, and there is no effect on the resin, making it possible to process the resin with the laser in the same way as the amorphous alloy ribbon.

[0043] 2, a ribbon layer surface 5 and a resin layer surface 6 were confirmed on the laser-processed surface, and at least no melting marks were observed. Here, melting marks refer to metal marks melted by the heat of the irradiated laser. Furthermore, the thickness of each ribbon observed on the ribbon layer surface was substantially the same (1 μm or less) as the thickness of each ribbon on the inside spaced apart from the laser-processed surface, and it was found that there was no influence of burrs or the like that would be observed in the case of mechanical processing.

[0044] Figure 3 is a laser microscope photograph taken from the front of a laser-processed surface of a multilayer amorphous alloy ribbon, consisting of nine layers of laminated amorphous alloy ribbons, processed with a millisecond laser having a pulse width of 0.2 ms. The processing conditions for the millisecond laser were a laser output of 75 W, an oscillation frequency of 1000 Hz, and a laser beam scanning speed of 1000 mm / s. Figure 4 is a laser microscope photograph taken from the front of a laser-processed surface of a multilayer amorphous alloy ribbon, consisting of three layers of laminated amorphous alloy ribbons, processed with a nanosecond laser having a pulse width of 30 ns. The processing conditions for the nanosecond laser were a laser output of 40 W, an oscillation frequency of 100 kHz, a laser beam scanning speed of 2000 mm / s, and a number of scans of 130.

[0045] As can be seen from Figures 3 and 4, melting marks were observed all over the laser-processed surfaces processed with the millisecond laser and nanosecond laser, and the ribbon layer surface 5 and the resin layer surface 6 could not be confirmed.

[0046] Therefore, a cut piece of a multilayer amorphous alloy ribbon in which a plurality of amorphous alloy ribbons are interlayer-bonded with a resin according to this embodiment has a laser-machined surface, and at least a portion of the laser-machined surface is characterized in that a ribbon layer surface formed of the amorphous alloy ribbon and a resin layer surface formed of the resin are visible. That is, a cut piece of a multilayer amorphous alloy ribbon in which a plurality of amorphous alloy ribbons are interlayer-bonded with a resin according to this embodiment has a laser-machined surface in which a ribbon layer surface formed of the amorphous alloy ribbon and a resin layer surface formed of the resin are visible, and at least no melting marks are visible on the laser-machined surface. This configuration reduces unevenness on the laser-machined surface, contributing to improved dimensional accuracy and ultimately to improved core assembly accuracy. Furthermore, because the ribbon layer surface and the resin layer surface are visible, insulation between the layers can be expected.

[0047] FIG. 5 shows profiles of the cross sections of the laser-processed surfaces of Samples B, C, and D. The profile in FIG. 5 is a graph showing the distance from the reference point, which is the edge of the upper surface 2 of the cut piece, to the cross section of the laser-processed surface 4 in the thickness direction (stacking direction) of the cut piece. As can be seen from FIG. 5, it can be confirmed that the stacked amorphous alloys do not form large steps, and the laser-processed surface is generally free of significant irregularities. Here, if the distance from the reference point to the tip of the lower surface 2, i.e., the edge of the lower surface 2, is defined as the taper, the taper for Samples A, B, and C was 22.2 μm, 28.3 μm, and 29.7 μm, respectively.

[0048] Example 2 Example 2 is a cut piece sample prepared in the same manner as Example 1, except that the laser beam scanning speed was 5000 mm / s and the number of scans was 210.

[0049] Figure 6 is a laser microscope photograph of the laser-processed surface 4 of the sample taken from the front, similar to Figure 1. As can be seen from Figure 6, no cracks or peeling were observed.

[0050] Example 3 Example 3 is a cut piece sample prepared in the same manner as Example 1, except that the laser beam scanning speed was 10,000 mm / s and the number of scans was 380.

[0051] Figure 7 is a laser microscope photograph of the laser-processed surface 4 of the sample taken from the front, similar to Figure 1. As can be seen from Figure 7, no cracks or peeling were observed.

[0052] Example 4 Example 4 was the same as Example 1 except that the amorphous alloy ribbon had two layers and the laser beam was scanned 120 times, and multiple cut sample pieces (Sample E, Sample F, Sample G, and Sample H) were produced.

[0053] Figure 8 is a laser microscope photograph taken from the front of the laser-processed surface 4 of sample E, similar to Figure 1. As can be seen from Figure 8, no cracks or peeling were observed in the thickness direction (stacking direction) of sample E.

[0054] Figure 9 shows the cross-sectional profiles of Samples F, G, and H. As can be seen from Figure 14, it was confirmed that the thickness direction (stacking direction) of the cut pieces formed a processed surface that was generally free of significant irregularities. Here, the tapers of Samples F, G, and H were 21.1 μm, 21.8 μm, and 17.5 μm, respectively.

[0055] (Comparative Example 1) Comparative Example 1 is a cut sample prepared under the same conditions as Example 1, except that five layers of amorphous alloy ribbon were stacked without interlayer bonding, the laser beam scanning speed was 2500 mm / s, and the number of scans was 120.

[0056] Figure 10 is a laser microscope photograph of the top surface taken in the same manner as Figure 1, and Figure 11 is a laser microscope photograph of the laser-processed surface 4 of the sample taken from the front. As can be seen from Figure 10, cracks 7 were confirmed on the top surface 2 of the sample. Furthermore, from Figure 11, peeling 8 and melting marks were confirmed in the thickness direction (stacking direction).

[0057] The conditions and cutting results of the example and comparative example of this embodiment are summarized as follows.

[0058] [Table 1]

[0059] [Table 2]

[0060] [Table 3]

[0061] Table 1 shows the laser conditions in the examples and comparative examples. Table 2 shows the cutting results in the examples and comparative examples. As can be seen from Table 2, in Examples 1 to 4, which are cut pieces of multilayer amorphous alloy ribbons formed by laminating and interlayer bonding amorphous alloy ribbons, cutting was possible without the occurrence of cracks or peeling. Table 3 shows the taper results in the examples. It was confirmed that the taper was 17 μm to 30 μm. In other words, it is preferable that the cut pieces obtained in this embodiment have a laser-processed surface, and that the taper of the laser-processed surface is 30 μm or less. This is because it contributes to improving the dimensional accuracy during core assembly.

[0062] On the other hand, as can be seen from the results of Comparative Example 1, when the cutting process was performed using the same laser pulse oscillation frequency and scanning speed as in the example, cracks occurred in the amorphous alloy ribbon, and cutting was not possible. Furthermore, since cutting was not possible, taper measurement was not possible.

[0063] As described above, according to the present invention, it is possible to obtain cut pieces of a multilayer amorphous alloy ribbon while suppressing cracks such as fissures and breaks, and therefore it is possible to provide a method for manufacturing cut pieces of a multilayer amorphous alloy ribbon that is advantageous in ensuring productivity. Also, according to the present invention, it is possible to obtain cut pieces of a multilayer amorphous alloy ribbon while suppressing peeling between the amorphous alloy ribbons constituting the multilayer amorphous alloy ribbon and the resin used for interlayer bonding. [Explanation of symbols]

[0064] 1. Cut pieces of multilayer amorphous alloy ribbon 2 Top side 3 Bottom side 4 Laser processed surface 5 Thin layer surface 6 Resin layer surface 7. Crack 8 Peeling

Claims

1. A method for manufacturing a cut piece of a multilayer amorphous alloy ribbon in which a plurality of amorphous alloy ribbons are interlayer-bonded with a resin, comprising: A method for manufacturing a cut piece of a multilayer amorphous alloy ribbon, comprising the steps of: irradiating a multilayer amorphous alloy ribbon, in which a plurality of amorphous alloy ribbons are interlayer-bonded with a resin, with a pulse laser having a pulse width of less than nanoseconds to process the multilayer amorphous alloy ribbon into the cut piece.

2. 2. The method for producing a cut piece of a multilayer amorphous alloy ribbon according to claim 1, wherein the scanning speed of the pulse laser is 5000 mm / s or more.

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