CN112004621A

CN112004621A - Amorphous metal ribbon, method for processing same, and method for producing laminate

Info

Publication number: CN112004621A
Application number: CN201980027450.0A
Authority: CN
Inventors: 太田元基
Original assignee: Hitachi Metals Ltd
Current assignee: Proterial Ltd
Priority date: 2018-04-25
Filing date: 2019-04-24
Publication date: 2020-11-27
Anticipated expiration: 2039-04-24
Also published as: WO2019208651A1; JP7388518B2; CN112004621B; JP2023015164A; JP7219869B2; JP2023015163A; JPWO2019208651A1; JP7396434B2

Abstract

The invention provides a method for inhibiting the generation of cracks or fissures in an amorphous metal ribbon during the machining of the amorphous metal ribbon. The method for processing an amorphous metal ribbon according to the present invention includes vibrating the amorphous metal ribbon and then machining the amorphous metal ribbon or machining the amorphous metal ribbon while vibrating the amorphous metal ribbon. Specifically, in the method of processing the amorphous metal ribbon, the amorphous metal ribbon has a saturation magnetostriction of 1ppm or more, and the vibration is vibration caused by the magnetostriction of the amorphous metal ribbon. Alternatively, the amorphous metal thin strip is machined at a portion where vibration is locally applied by a machining tool.

Description

Amorphous metal ribbon, method for processing same, and method for producing laminate

Technical Field

The invention relates to an amorphous metal ribbon, a method for processing the same, and a method for manufacturing a laminate.

Background

Amorphous metal ribbons (amorphous metal ribbons) are widely used in a variety of applications. For example, the amorphous metal ribbon having soft magnetism is used in the fields of information devices, automobiles, home electric appliances, consumer electric appliances, industrial machines, and the like, and specifically, is used as a material useful for high efficiency and high gain, such as a rotating electric machine, a reactor, a power transformer, a noise suppression component, and a magnetic antenna.

Thin amorphous metal ribbons are generally considered to be of high hardness and low ductility. For example, an amorphous metal ribbon having soft magnetism is generally produced by a molten metal quenching method such as a single roll method from a molten metal into a long (long) ribbon-shaped member. The thickness of the thin strip is mainly 5 to 70 μm. The hardness of these metal ribbons has a Vickers hardness HV of 500 or more. Therefore, the amorphous metal ribbon has a disadvantage of being significantly difficult to machine.

Conventionally, these amorphous metal thin strips are mainly used for a wound core that is wound in a toroidal shape and can be manufactured with little machining. In recent years, a technique has been studied in which an amorphous metal ribbon is laminated on a winding core and used as a magnetic component such as a rotating electric machine, a reactor, and an antenna.

Since the amorphous metal ribbon is manufactured as a ribbon-shaped member, when the amorphous metal ribbon is laminated to form a laminate, a step of processing the ribbon-shaped amorphous metal ribbon into a predetermined shape and then laminating the ribbon-shaped amorphous metal ribbon may be employed. As a method of processing the amorphous metal ribbon into a predetermined shape, there are etching, electric discharge machining, laser machining, and the like. However, these processing methods have a problem in industrial production because of their extremely low processing efficiency. Further, since the amorphous metal ribbon is brittle, there is a problem that cracks and cracks are inevitably generated and the finished product is poor.

The processing method that is common to the amorphous metal thin strip is still a mechanical processing such as punching and cutting in which a die and a processing tool are moved in the thickness direction. However, in the machining process using the amorphous metal ribbon as the workpiece, cracks and fissures are more likely to occur than in the above-described machining process.

As a countermeasure, for example, patent document 1 discloses an invention based on punching an amorphous metal ribbon, and discloses a technique of producing a laminate in which a plurality of soft magnetic metal ribbons having a thickness of 8 to 35 μm are laminated, and forming a thermosetting resin between the metal ribbons to a predetermined thickness. Further, as an effect thereof, it is described that a high-performance laminate excellent in punching workability can be easily provided.

Documents of the prior art

Patent document

Patent document 1: japanese patent application laid-open No. 2008-213410

Disclosure of Invention

Problems to be solved by the invention

However, as measures for coping with cracks and fissures, not only studies for enhancing mechanical strength by a member other than the amorphous metal ribbon as in patent document 1, but also studies for improving the machining itself are required.

The present invention aims to provide a method for suppressing the occurrence of cracks and fissures in an amorphous metal ribbon during the machining of the amorphous metal ribbon. Also provided is a method for producing a laminate using the amorphous metal ribbon. Further, an amorphous metal ribbon obtained by the mechanical processing is provided.

Means for solving the problems

The invention relates to a method for processing an amorphous metal thin strip,

the amorphous metal ribbon is vibrated and then machined, or machined while being vibrated.

In the present invention, the amorphous metal ribbon may have a saturation magnetostriction (saturation magnetostriction) of 1ppm or more, and the vibration may be vibration caused by the magnetostriction of the amorphous metal ribbon.

The frequency of the vibration may be 1Hz to 500 kHz.

The vibration can be generated by applying an alternating-current magnetic field of 1A/m or more to the amorphous metal ribbon.

The amorphous metal ribbon is a long ribbon, and can be machined while being conveyed in the long direction.

In the present invention as described above,

the amorphous metal thin strip can be machined at a portion where vibration is locally applied by a machining tool.

The processing method can be as follows: the processing tool includes a punch and a punch holder capable of holding upper and lower surfaces of the amorphous metal ribbon, at least one of the punch and the punch holder is slidable in a thickness direction of the amorphous metal ribbon, the upper and lower surfaces of the amorphous metal ribbon are held by the punch and the punch holder, and at least one of the punch and the punch holder vibrates in the thickness direction, the amorphous metal ribbon is vibrated at a portion of the amorphous metal ribbon located at a sliding portion of the punch and the punch holder, and a portion subjected to repeated fatigue by the vibration is subjected to punching by the punch.

As the amorphous metal ribbon, a material containing Fe as a main component produced by roll cooling can be used.

The amorphous metal ribbon may have a thickness of 5 μm or more and 70 μm or less.

The amorphous metal ribbon may have a vickers hardness HV of 500 or more.

The amorphous metal ribbons processed by the processing method for the amorphous metal ribbons can be laminated to form a laminate.

The amorphous metal ribbon of the present invention is obtained by the above-described method for processing an amorphous metal ribbon.

The amorphous metal ribbon is formed by machining a shear surface on a machining surface of the ribbon, and the profile of the roll-off surface side of the ribbon surface on the machining surface has a corrugated shape.

The corrugated profile can have irregularities with a period of 0.1 to 20 μm on average.

In addition, the sheared surface may occupy 40% or more of the area of the machined surface.

Further, the contour of the shear surface on the sagging side may have a correlated wave pattern with respect to the contour of the sagging side of the thin strip surface.

Further, other amorphous metal thin strips of the present invention are as follows.

An amorphous metal thin strip having a shear plane formed by machining on a machining surface of the thin strip,

the machined surface of the machined thin strip has a fracture surface area of 50% or more.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to suppress cracks and fissures generated in an amorphous metal ribbon during machining of the amorphous metal ribbon. This makes it possible to obtain a machined amorphous metal ribbon with high dimensional accuracy, and further, to obtain a laminate obtained by laminating the amorphous metal ribbons.

Drawings

Fig. 1 is a schematic view of a processing apparatus used in the present invention.

Fig. 2 is a schematic view of another processing apparatus used in the present invention.

Fig. 3 is a schematic view of another processing apparatus used in the present invention.

Fig. 4 is a schematic view of another processing apparatus used in the present invention.

Fig. 5 is a schematic view of a machined amorphous metal ribbon that is judged to be acceptable and free of cracks and fissures.

Fig. 6 is a schematic view of the machined amorphous metal ribbon judged to be defective and having cracks and fissures.

Fig. 7 is a BH curve showing soft magnetic characteristics of an amorphous metal ribbon used in the embodiment.

Fig. 8 is an enlarged view of a part of the horizontal axis of fig. 7.

Fig. 9 is a photograph of the processed surface of the amorphous metal ribbon (table 1No.2) of example 1.

Fig. 10 is an enlarged photograph of fig. 9.

Fig. 11 is a schematic view of fig. 10.

FIG. 12 is a photograph of a processed surface of an amorphous metal ribbon for comparison (Table 1No. 8).

Fig. 13 is an enlarged photograph of fig. 12.

Fig. 14 is a schematic view of fig. 13.

Fig. 15 is a photograph of the processed surface of the amorphous metal ribbon of example 4.

Fig. 16 is a schematic view of fig. 15.

Fig. 17 is a photograph of a processed surface of another amorphous metal ribbon for comparison.

Fig. 18 is a schematic view of fig. 17.

Detailed Description

The present invention will be described specifically by way of embodiments, but the present invention is not limited to these embodiments.

An embodiment of the present invention is a method of processing a thin strip of amorphous metal,

Amorphous metal ribbon is a material with extremely high fracture toughness. Therefore, when the thin strip starts to be broken in the machining, a large plastic deformation occurs at the tip of the fracture crack, and as a result, a large impact occurs between the amorphous metal thin strip and the machining tool. Further, since the amorphous metal ribbon has extremely high hardness as described above, cracks and cracks are likely to be generated in the cut portion by the impact. In particular, when the workpiece is processed into a complicated shape, cracks and fractures are likely to occur in corners having a small curvature.

However, the present inventors have found that this problem can be suppressed by using the above-described processing method.

Hereinafter, a mechanism for obtaining the effect of the present invention is presumed.

Generally, glass is often cut by a method of forming a scratch on the surface, mainly by elastic fracture which propagates a crack starting from the scratch. The arrangement of atoms throughout the glass is mainly covalent electron coupling, and any part of the glass is hard, so that the above processing method can be adopted.

Just as amorphous metal ribbons are also referred to as metallic glasses, the arrangement of atoms is irregular, as is the case with glass. However, unlike general glasses, the coupling form between transition metals (for example, between Fe and Fe) is mainly metal coupling, but in coupling containing semimetals (metalloid elements), covalent electron coupling is formed, and the hardness varies depending on the location in the atomic layer of the ribbon. In addition, in the metal (alloy), there are a large number of spaces (lattice defects in the crystal phase) of atoms called free volumes (free volumes) by which atoms can move, and thus large plastic deformation is allowed. On the other hand, the surface of the thin strip has no free volume and has a very hard characteristic. Therefore, it is assumed that the amorphous metal ribbon is difficult to apply to the same processing method as glass, and needs to be mechanically processed by shear deformation.

Therefore, the inventors of the present invention have conceived of a machining method in which an amorphous metal ribbon is vibrated and then machined, or machined while vibrated. Here, the machining while vibrating the amorphous metal ribbon further includes machining the amorphous metal ribbon while vibrating a machining tool.

The above processing method is considered to obtain the effects (1) to (3).

(1) The brittleness of the amorphous metal ribbon can be improved by vibrating the amorphous metal ribbon. Therefore, by performing machining after vibration, the workability can be improved for a processing object that is not vibrated.

(2) The brittleness of the amorphous metal ribbon can be improved by vibrating the amorphous metal ribbon. Therefore, by performing the machining while vibrating the machining tool, that is, by performing the machining while vibrating the amorphous metal ribbon, it is possible to improve the workability of the object to be machined which is not vibrated.

(3) Since the amorphous metal ribbon is vibrated relatively when it comes into contact with the processing tool by performing the machining while vibrating the amorphous metal ribbon, the machining is started in the same state as the polishing of the hard surface of the amorphous metal ribbon, and the high-precision machining can be realized. Further, the inside of the thin strip is shear-deformed by machining thereafter.

In the case of using a sharp cutting blade as a processing tool, the cutting blade is generally pressed against a workpiece, and the workpiece is relatively moved in this state to cut. In this case, the cutting blade and the workpiece need to be moved in a predetermined direction by a predetermined distance. Moreover, the machining of curves and complex shapes is extremely difficult.

In the case of using vibration as in the present invention, it is known that the edge portion of the cutting blade is microscopically serrated, and when such a cutting blade vibrates against the amorphous metal thin strip, a cut can be formed in the surface of the workpiece without moving the workpiece and the cutting blade relatively long distances.

In addition, the present invention can expect an effect of extending the life of the machining tool as another secondary effect. Since the pressing speed is suppressed, the impact at the time of striking the hard tape surface is greatly reduced.

In the present invention, machining refers to a known machining method for machining a workpiece using a machining tool or a machine tool. For example, punching, shearing, cutting, slitting, and the like.

A specific method of processing the amorphous metal ribbon will be described below.

In an embodiment of the present invention, the amorphous metal ribbon may have a saturation magnetostriction of 1ppm or more, and the vibration may be vibration caused by the magnetostriction of the amorphous metal ribbon.

The processing method is characterized in that an alternating current magnetic field is applied to the amorphous metal ribbon to vibrate the ribbon by magnetostriction without causing the amorphous metal ribbon to vibrate due to external stress. By performing the vibration in this manner, only the amorphous metal ribbon can be easily vibrated. Therefore, by vibrating the machining tool, the workpiece can be vibrated with small energy. Further, since the amorphous metal ribbon itself serves as a vibration source, it can be reliably vibrated, and the effect of suppressing cracks and fissures can be improved. That is, in the case of processing a laminated body of an amorphous metal ribbon with a resin sandwiched therebetween, when the laminated body is vibrated by external stress, there is a possibility that the vibration is absorbed by the resin and the amorphous metal ribbon on the inner side in the laminating direction is not given sufficient vibration.

The processing method is characterized in that the amorphous metal ribbon is vibrated in a plurality of directions. In the present embodiment, since the amorphous metal ribbon is vibrated by magnetostriction, vibration due to compression and expansion is generated in the direction in which the magnetic field is applied, and vibration due to expansion and compression is simultaneously generated in the direction perpendicular to the direction in which the magnetic field is applied. That is, no matter in which direction the working tool is in contact with the amorphous metal ribbon, the two are in a state of stable relative sliding as compared with the vibration in a single direction, and therefore, the effect of suppressing the crack and the fissure is easily obtained.

In addition, the machining method is easier to machine than conventional machining. The reason for this will be described below.

Most amorphous metal ribbons are produced by roll quenching in view of industrial productivity. Roll quenching is a method of dropping a molten liquid metal onto a roll made of a metal having high thermal conductivity (for example, a Cu alloy), bringing the metal into close contact with the roll, and rapidly solidifying the metal. Because 1 × 10 can be obtained⁵～1×10⁷Extremely high cold around DEG C/sHowever, since the speed is high, roll quenching is widely used as a casting method for an amorphous metal thin strip.

However, since the molten metal is solidified in a very short time, unevenness in the cooling rate is reflected in part, and unevenness is likely to occur on the surface of the ribbon. When these ribbons are laminated and punched simultaneously, the convex portions on the surface of 1 of the ribbons easily contact the surface of the opposite ribbon and are not easily slid in the in-plane direction, and therefore, the processing is easily performed along the shape of the blade of the processing tool, but the stress from the processing tool is dispersed and the processing is not easily performed along the shape of the blade of the processing tool because the sliding is easily generated in the concave portions.

In particular, since the amorphous metal ribbon has high hardness, it is necessary to accelerate the relative speed with respect to the processing tool during machining, and the amorphous metal ribbon is torn and broken, thereby causing a defect of being separated from the cutting line.

In the method of processing an amorphous metal ribbon according to the present embodiment, since the ribbon is machined in a state of vibration, the ribbon is moved relatively and positively, and thus, a fine notch is generated from a portion where the processing tool is in contact with the ribbon, and shear deformation can be advanced from this position as a starting point. Therefore, the recessed portion of the thin strip is also fixed by the constraining force of the surrounding portion where the constraint is strong, so that the cutting becomes easy.

In the present embodiment, an amorphous metal ribbon having a saturation magnetostriction of 1ppm or more is used. If the saturation magnetostriction is less than 1ppm, sufficient vibration is not generated, and the effect of the present invention is not easily obtained. The saturation magnetostriction is preferably 3ppm or more, more preferably 5ppm or more, more preferably 10ppm or more, and still more preferably 15ppm or more.

The frequency of the vibration is preferably 1Hz to 500 kHz. If the frequency is less than 1Hz or exceeds 500kHz, the effect of suppressing cracks and fissures is difficult to obtain.

The lower limit of the frequency is preferably 10Hz, more preferably 100Hz, and still more preferably 1 kHz. The upper limit value of the frequency is preferably 400kHz, more preferably 300kHz, more preferably 80kHz, more preferably 60kHz, more preferably 40 kHz.

The vibration is preferably generated by applying an alternating-current magnetic field of 1A/m or more to the amorphous metal ribbon. If the lower limit of the AC magnetic field is less than 1A/m, the effect of suppressing cracks and fissures is difficult to obtain.

The lower limit of the alternating magnetic field is preferably 10A/m, more preferably 30A/m, more preferably 70A/m, more preferably 100A/m, more preferably 130A/m.

The amorphous metal ribbon is a long (long) ribbon, and the amorphous metal ribbon can be machined while being conveyed in the long direction. Further, when the machining is performed while the conveyance is performed, the movement of the amorphous metal ribbon may be stopped during the machining, and the movement may be resumed after the machining, so that the machining may be continuously performed.

Thin strips in transit are known to be prone to breakage. When the ribbon is vibrated by external stress, there is a concern that the ribbon during transportation may be further broken around the place where the stress is applied. On the other hand, when the amorphous metal ribbon is vibrated by magnetostriction, magnetic flux flows in the in-plane direction of the amorphous metal ribbon, and local internal stress is less likely to be generated.

The object of the workpiece of the present invention is limited to the amorphous metal ribbon, but the processing method of the present embodiment is not limited to this, and the effect of suppressing cracks and fissures can be obtained even for materials having magnetostriction other than the amorphous metal ribbon.

That is, as another invention, there can be provided a method of machining a thin metal strip by applying vibration to at least one of the thin metal strip and a machining tool used for machining,

the metal thin strip has a saturated magnetostriction of 1ppm or more, and the vibration is a vibration caused by the magnetostriction of the metal thin strip, thereby providing the same effect as the present invention.

According to the method for processing an amorphous metal ribbon described above, an amorphous metal ribbon according to the following embodiment is obtained.

The amorphous metal ribbon of the present embodiment has a shear surface formed by machining on a machined surface of the ribbon, and the contour of the surface of the ribbon on the sag surface side is corrugated on the machined surface. The processed surface corresponds to a surface (side surface) to be punched and a surface (cut surface) to be cut in the punching and cutting processes.

Specifically, the corrugated profile can have irregularities with a period of 0.1 to 20 μm on average. The reason why the irregularities are present at a period of 0.1 to 20 μm is presumed as follows. In the magnetostrictive vibration method, the polarity of the magnetic field is switched at a period of several tens of kHz. I.e. switching the positive and negative magnetization states at a high frequency. The magnetostriction also becomes large in the magnetized state, and the magnetostriction also becomes zero in the state where the magnetization is zero. The high-speed magnetization reversal is caused by the movement of the magnetic wall, and the magnetic wall is the minimum magnetostriction. The magnetic domain width (the distance between the magnetic walls, which is about 2 times the moving distance of the magnetic walls) is 0.2-40 μm so as to follow the high-speed magnetization reversal. It is assumed that the magnetic wall having a volume different from the surrounding is moved in a state of being pressed from the upper surface by the blade, as if the blade is moved in a zigzag manner. The average period of the irregularities is measured by measuring the interval between the deepest portions of the adjacent recesses at least at 5 positions and measuring the average value of the intervals. The irregularities have a difference of 0.3 μm or more in height in the thickness direction of the thin strip of the concave portion and the convex portion.

In the amorphous metal ribbon of the present embodiment, the shear plane may occupy 40% or more of the area of the processed surface. The shear plane may occupy 50% or more, may further occupy 60% or more, and may further occupy 65% or more of the area. The numerical value of the area occupied by the shear plane of the machined surface can be calculated by the following measurement method. First, the thickness T of the ribbon (T1, T2, … … Tn) and the width W of the shear plane (W1, W2, … … wn) were measured at arbitrary multiple locations on the processed surface. Then, Wsum/Tsum × 100 (%) was calculated from the sum Tsum of T1 to Tn and the sum Wsum of w1 to w 2. In the present embodiment, the above numerical values were calculated by setting 5 points at any measurement point within a range of 450 μm in width of the machined surface.

In the amorphous metal ribbon of the present embodiment, the contour of the worked surface on the sag surface side of the sheared surface may have a wavy shape relative to the contour of the worked surface on the sag surface side. The corrugated pattern means that variations in the period of the irregularities (the interval between the deepest portions of adjacent recesses) occur similarly in both the contours. The reason why both the two corrugated profiles have a correlation is presumed as follows. As mentioned above, the origin of this periodicity is believed to depend on the distance between the magnetic walls. The magnetostriction that is seen here is linear magnetostriction, and the region in the magnetostrictive state different from the surroundings near the magnetic wall expands in the vertical direction, and the same periodic volume change repeats at the formation of the sag and the fracture, that is, directly below the blade, and therefore both contours are considered to be very similar.

Other embodiments of the method for processing an amorphous metal ribbon according to the present invention will be described. In this embodiment, a method is used in which a portion of an amorphous metal ribbon to which vibration is locally applied by a processing tool is mechanically processed.

According to this embodiment, since the portion having increased brittleness is machined, workability can be improved, and the effect of suppressing cracks and fissures can be easily obtained.

This embodiment, for example, the processing tool includes a punch and punch holder capable of holding the upper and lower surfaces of the amorphous metal ribbon,

at least one of the punch and the punch holder is slidable in a thickness direction of the amorphous metal thin strip,

the following steps can be adopted: the upper and lower surfaces of the amorphous metal ribbon are held between the punch and the punch holder, and at least one of the upper and lower surfaces vibrates in the thickness direction, and the portion of the amorphous metal ribbon located at the sliding portion of the punch and the punch holder is vibrated to perform punching processing on the portion subjected to repeated fatigue due to the vibration.

According to this embodiment, the following amorphous metal ribbon is obtained.

The amorphous metal ribbon of the present embodiment has a shear surface formed by machining on the machined surface of the ribbon, and the fracture surface occupies 50% or more of the area of the machined surface of the machined ribbon. The fracture surface may occupy 60% or more, and may further occupy 65% of the area.

The numerical value of the area occupied by the fracture surface of the machined surface can be calculated by the following measurement method. First, the thickness T (T1, T2, … … Tn) and the width W (W1, W2, … … Wn) of the ribbon were measured at arbitrary multiple locations on the processed surface. Then, Wsum/Tsum × 100 (%) was calculated from the sum Tsum of T1 to Tn and the sum Wsum of W1 to W2. In the present embodiment, the above numerical values were calculated by setting 5 points at any measurement point within a range of 450 μm in width of the machined surface.

Hereinafter, the amorphous metal ribbon used in the present embodiment will be described.

The means for producing the amorphous metal ribbon is not particularly limited.

For example, a thin strip containing Fe as a main component, which is produced by roll cooling, can be used. The main component is a component having the largest content.

The amorphous metal ribbon of the present embodiment is made of, for example, a material having the following composition: when the total amount of Fe, Si and B is 100 atomic%, Si is 0 atomic% or more and 10 atomic% or less, B is 10 atomic% or more and 20 atomic% or less, and Fe accounts for the rest.

If the Si content and the B content are outside the ranges, the amorphous alloy is difficult to be formed during the roll cooling production, and the mass productivity is liable to be lowered. The additive or the unavoidable impurities may contain elements other than Fe, Si and B, such as Mn, S, C and Al. The amorphous metal ribbon preferably has the above-described composition, and is an amorphous (amorphous) ribbon having no crystal structure, and is preferably a soft magnetic body. The amount of Si is preferably 3 at% or more and 10 at% or less. The amount of B is preferably 10 at% to 15 at%. The amount of Fe is preferably 78 atomic% or more, more preferably 79.5 atomic% or more, still more preferably 80 atomic% or more, and still more preferably 81 atomic% or more in order to obtain a high saturation magnetic flux density Bs. The amorphous metal ribbon may contain unavoidable impurities, but the total proportion of Fe, Si, and B is preferably 95 mass% or more, and more preferably 98 mass% or more. The amorphous metal ribbon may be referred to as an amorphous alloy ribbon, a soft magnetic amorphous alloy ribbon, or the like.

The amorphous metal ribbon having the above composition has a saturation magnetostriction of 5ppm or more and a Vickers hardness HV of 700 or more.

Furthermore, a thin amorphous metal ribbon capable of nano-crystallization may also be used. As the amorphous metal ribbon capable of nano-crystallization, an Fe-based ribbon can be used. Specifically, as the Fe-based amorphous alloy ribbon, a ribbon represented by the following general formula can be used: (Fe)_1-aM_a)_{100-x-y-z-α-β-γ}Cu_xSi_yB_zM’_αM”_βX_γ(atomic%) (wherein M is Co and/or Ni, M 'is at least 1 element selected from Nb, Mo, Ta, Ti, Zr, Hf, V, Cr, Mn and W, M' is at least 1 element selected from Al, platinum group elements, Sc, rare earth elements, Zn, Sn, Re, X is at least 1 element selected from C, Ge, P, Ga, Sb, In, Be, As, a, X, y, z, α, β and γ satisfy 0. ltoreq. a.ltoreq.0.5, 0.1. ltoreq. x.ltoreq.3, 0. ltoreq. y.ltoreq.30, 0. ltoreq. z.ltoreq.25, 5. ltoreq. y + z.ltoreq.30, 0. ltoreq. α.ltoreq.20, 0. ltoreq. β.ltoreq.20, and 0. ltoreq. γ. 20.). Preferably, in the above general formula, a, x, y, z, α, β and γ are in the ranges satisfying 0. ltoreq. a.ltoreq.0.1, 0.7. ltoreq. x.ltoreq.1.3, 12. ltoreq. y.ltoreq.17, 5. ltoreq. z.ltoreq.10, 1.5. ltoreq. α.ltoreq.5, 0. ltoreq. β.ltoreq.1 and 0. ltoreq. γ.ltoreq.1, respectively.

The amorphous metal ribbon capable of nano-crystallization is subjected to a heat treatment at a temperature not lower than the crystallization initiation temperature to nano-crystallize the amorphous metal ribbon.

The alloy after nano-crystallization, at least 50% by volume, and further 80% by volume, of which are occupied by fine crystal grains having an average grain diameter of 100nm or less as measured by the maximum dimension. In addition, the alloy is mainly amorphous except for fine grains. The proportion of fine grains can also be substantially 100% by volume.

An alloy having these compositions is melted at a temperature equal to or higher than the melting point, and quenched and solidified by a roll method, whereby a long amorphous metal ribbon can be obtained.

An amorphous metal ribbon having a thickness of 5 to 70 μm can be used. If the thickness is less than 5 μm, the mechanical strength of the amorphous metal ribbon becomes insufficient, and handling during machining and continuous conveyance in the longitudinal direction tend to become difficult. The thickness is preferably 15 μm or more, and more preferably 20 μm or more. On the other hand, if the thickness of the ribbon exceeds 70 μm, there is a tendency that it is difficult to stably obtain an amorphous phase in a thin ribbon depending on the composition. The thickness is preferably 50 μm or less, more preferably 35 μm or less, and still more preferably 30 μm or less.

An apparatus according to an embodiment for performing machining will be described.

For example, the apparatuses shown in fig. 1, 2, and 3 can be used. However, the device that can be used in the present invention is not limited to this.

The apparatus of fig. 1 is a schematic view of an apparatus used in the method of processing an amorphous metal ribbon according to the embodiment (which performs mechanical processing while vibrating an amorphous metal ribbon having magnetostriction by magnetostriction).

The apparatus of fig. 1 includes an amorphous metal ribbon 1, a coil 2 wound so as to flow a magnetic flux to the amorphous metal ribbon 1, and a machining tool 6 capable of machining the amorphous metal ribbon 1. The coil 2 is supplied with an ac current amplified by the amplifier 4 and supplied from the ac power supply 3.

In the embodiment of fig. 1, a long amorphous metal ribbon 1 is wound around an annular bobbin 5 having flexibility at least on the outer peripheral side in the circumferential direction. The processing tool 6 is a cutting blade. The processing tool 6 is movable in the radial direction of the spool 5, and when moving to the spool side, the tip of the cutting blade can come into contact with the amorphous metal thin strip 1 wound around the peripheral surface of the spool 5. The bobbin is made of a flexible material that can be inserted into the outer peripheral side of the bobbin 5 and is configured to move from the outer peripheral surface to the inner peripheral side of the bobbin.

A method of use of the apparatus of fig. 1 is illustrated. An alternating current flows through the coil 2 to generate an alternating magnetic field in the axial direction of the coil, and an alternating magnetic flux flows through the amorphous metal ribbon 1 disposed inside the coil to magnetostrictively vibrate the amorphous metal ribbon 1. The front end of the cutting blade 6 is pressed against the surface of the amorphous metal thin strip 1 while maintaining this state, and the amorphous metal thin strip 1 is subjected to machining such as cutting, slitting, punching, and the like.

In the embodiment of fig. 1, the amorphous metal ribbon 1 wound around the bobbin does not need to be annular, but may be formed in an arc shape. In this case, a yoke for returning the magnetic flux flowing to the amorphous metal thin strip may be used.

The apparatus of fig. 2 is a schematic view of another apparatus used in the method of processing an amorphous metal ribbon according to the embodiment (machining the amorphous metal ribbon having magnetostriction while causing magnetostriction vibration), similarly to fig. 1.

The apparatus of fig. 2 includes, as in fig. 1, an amorphous metal ribbon 1, a coil 2 wound so that a magnetic flux flows into the amorphous metal ribbon 1, and a machining tool capable of machining the amorphous metal ribbon 1.

In the embodiment of fig. 2, in the drawing, 6a is a punch (punch, piercing machine) for punching, and 6b is a punch frame (punch frame, piercing frame) for punching, as the machining tool. A part of the long amorphous metal ribbon 1 is disposed at a position where it can be punched by the processing tools 6a and 6 b. In the figure, a long amorphous metal thin strip 1 is unwound from an unwinding roll 7 and conveyed to processing tools 6a and 6 b. The processing tools 6a and 6b punch the transported amorphous metal ribbon 1. This enables machining to be performed simultaneously with the continuous conveyance of the amorphous metal ribbon 1.

In the figure, the coil 2 is formed such that the axial direction thereof is parallel to the longitudinal direction of the amorphous metal thin strip 1.

The ac power supply 3 and the amplifier 4 have the same configuration as that of fig. 1, and the description thereof is omitted.

A method of use of the apparatus of fig. 2 is illustrated. As in fig. 1, an alternating current flows through the coil 2 to generate an alternating magnetic field in the axial direction of the coil, and an alternating magnetic flux flows through the amorphous metal ribbon 1 disposed inside the coil to magnetostrictively vibrate the amorphous metal ribbon 1. The punching process is performed by sliding the processing tools 6a and 6b while maintaining this state.

In the embodiment of fig. 2, a yoke 8 for returning magnetic flux flowing to the amorphous metal ribbon is used.

The apparatus of fig. 3 is a schematic view of an apparatus applied to the processing method of the amorphous metal ribbon (the processing method of mechanically processing a portion where vibration is locally applied by the processing tool to the amorphous metal ribbon) according to the embodiment. The portion to which the vibration is applied is embrittled by repeated fatigue. Therefore, machining becomes easy.

The apparatus of fig. 3 comprises a thin strip of amorphous metal 1 and a processing tool capable of machining the thin strip of amorphous metal 1. The processing tool includes

punches

8a and 8b and punch

holders

9a and 9b capable of holding the upper and lower surfaces of the amorphous metal thin strip, respectively.

A method of use of the apparatus of figure 3 is described. Both the

punches

8a and 8b and the

punch holders

9a and 9b are slidable in the thickness direction of the amorphous metal ribbon. The amorphous metal ribbon 1 is held between the

punches

8a and 8b and the

punch holders

9a and 9b, respectively, and at least one of them vibrates in the thickness direction (arrows of the

punch holders

9a and 9b in fig. 3 indicate vibration), and the amorphous metal ribbon is vibrated at the portions located at the sliding portions of the

punches

8a and 8b and the

punch holders

9a and 9b, and repeated fatigue is applied by the vibration. Thereafter, as shown in fig. 4, the

punches

8a and 8b move in the thickness direction of the amorphous metal ribbon, whereby the amorphous metal ribbon 1 is subjected to punching at a portion subjected to repeated fatigue.

The unwinding roller 7 and the amorphous metal thin strip 1 have the same configuration as that of fig. 2, and the description thereof is omitted.

As the processing tool, for example, a cutting blade for cutting, a cutter blade for slitting, or the like can be used in addition to the above description.

As a method of applying vibration to at least one of the amorphous metal ribbon and the processing tool used for the processing, an ultrasonic generator or the like can be used in addition to magnetostrictive vibration by the coil. The ultrasonic generator can be of a known configuration, and is not particularly limited.

In the method of processing an amorphous metal thin strip described above, the amorphous metal thin strip may be machined in a state where a resin is applied to at least one surface of the amorphous metal thin strip or a resin sheet is attached thereto.

The amorphous metal ribbon processed by the method for processing an amorphous metal ribbon described above may be laminated to form a laminate.

(example 1)

The amorphous metal ribbon is machined using the apparatus described in fig. 1. Specifically, the following conditions were used.

The amorphous metal thin strip was a thin strip slit to a width of 25 mm.

As the amorphous metal ribbon, a ribbon of Fe: 82 atomic%, Si: 4 atomic%, B: a thin band of 14 atomic% composition. Further, unavoidable impurities such as Cu and Mn are 0.5% by mass or less.

The amorphous metal ribbon had a thickness of 20 μm, a saturation magnetostriction of 27ppm and a Vickers hardness HV of 800.

It is also known that an amorphous metal ribbon having such a composition has high magnetic permeability as a soft magnetic material, and magnetization easily follows an ac magnetic field, and the magnetic body itself vibrates by the magnetization process.

As the processing tool 6, a cutting blade having a sharp tip is used.

The bobbin 5 uses a paper tube. Since the outer peripheral side of the paper tube has flexibility, the tip of the cutting blade can be inserted to a position closer to the inner peripheral side than the outer peripheral portion. The outer diameter of the bobbin was 100 mm.

The slit amorphous metal thin strip 1 was wound around the bobbin in the circumferential direction for 2 turns. The magnetic path length of the wound amorphous metal ribbon 1 was about 0.314 m.

The number of turns of the coil 2 is 10. An alternating current of 10kHz to 200kHz is supplied from an alternating current power supply 3 to an amplifier 4, and the current is amplified by the amplifier 4 so that the maximum value of an alternating magnetic field generated in the coil is 70A/m or 130A/m, and the alternating current flows in the coil 2.

Under the above conditions, the amorphous metal ribbon 1 was magnetostrictively vibrated, and a load of 10kgf (approximately 100N lightly pressed by an arm) was applied to the cutting blade 6 while maintaining this state, and the tip thereof was pressed against the surface of the amorphous metal ribbon 1.

For comparison, machining was performed in the same manner as in embodiment 1, except that magnetostrictive vibration was not caused.

Under the above conditions, it was confirmed how much magnetostriction occurred in the amorphous metal ribbon.

Fig. 7 and 8 are B-H curves showing the soft magnetism of the amorphous metal ribbon used, and fig. 8 is an enlarged view of a portion of the horizontal axis of fig. 7. As shown in fig. 7, the magnetic flux density of the amorphous metal ribbon at 800A/m is approximately 1.5T, which is B, the saturation magnetic flux density. As shown in fig. 8, the magnetic flux density of 130A/m is 1.1T, which is about 73.3% of the saturation magnetic flux density. Since the saturation magnetostriction of the amorphous metal ribbon was 27ppm, when an alternating magnetic field of 130A/m was applied to the amorphous metal ribbon, the amorphous metal ribbon was magnetostrictively vibrated to a magnetostriction of 19.8ppm calculated by 27ppm × 73.3%.

Similarly, when the calculation was performed while applying an alternating magnetic field of 70A/m to the amorphous metal ribbon, it was magnetostrictively vibrated at a magnetostriction of 16 ppm.

Table 1 shows the frequency f of the ac power supply 3, the maximum magnetic field intensity H generated In the coil, the yield Out of the machining of the amorphous metal ribbon on the outer peripheral side, and the yield In of the machining of the amorphous metal ribbon on the inner peripheral side.

The yield of the machining was acceptable when no crack or crack was generated from the cut trace 12 as shown in fig. 5, and was not acceptable when the crack 10 or crack 11 was generated from the cut trace 12 as shown in fig. 6. The number of mechanical machining experiments was 10.

[ Table 1]

No	f(kHz)	H(A/m)	Out(％)	In(％)	Heat generation at 40 deg.C or higher
						1	10	130	90	90	Is free of
2	20	130	90	100	Is free of
						3	40	130	90	100	Is free of
4	60	130	80	80	Is provided with
						5	80	130	60	80	Is provided with
6	100	130	60	90	Is provided with
						7	200	70	60	90	Is provided with
8	0	0	10	50	Is provided with

In the measurement result of No.8, in which the amorphous metal ribbon was machined without magnetostrictive vibration, the yield on the outer periphery side was only 10%, and the yield on the inner periphery side was also only 50%.

On the other hand, the yield of the embodiment nos. 1 to 7, which were machined while causing the amorphous metal ribbon to magnetostrictively vibrate, was all 60% or more on the outer peripheral side, and 80% or more on the inner peripheral side, and the yield was improved in all embodiments as compared with the yield of the comparative example.

In particular, in the embodiment of No.1-4 in which the frequency of magnetostrictive vibration is 10 to 60kHz, the yield on the outer peripheral side is improved to 80% or more. Further, in the embodiment of No.1-3 having a frequency of 10 to 40kHz, the yield on the outer peripheral side is improved to 90% or more. Further, in the embodiments of Nos. 2 and 3 having a frequency of 20 to 40kHz, the yield on the inner peripheral side was also improved to 100%.

Table 1 also shows the presence or absence of heat generation of 40 ℃. The embodiment without heat generation of 40 ℃ or more shows a tendency of higher yield. The reason for this is considered to be that, when heat is not generated, magnetization follows the magnetic field, and the vibration of the magnetic field is efficiently converted into mechanical vibration. On the other hand, it is considered that the reason is that when the frequency of the alternating magnetic field increases, a large delay occurs in the response of magnetization to the magnetic field, that is, a loss occurs, and the loss is released as heat. It is assumed that the generation loss is that the energy of the applied magnetic field is not efficiently converted into the energy of the magnetostrictive vibration.

Fig. 9 is a photograph of the processed surface of the amorphous metal ribbon of No.2 in table 1. The magnification is 500 times. Fig. 10 is an enlarged photograph of fig. 9. The magnification is 3000 times. The upper side of the ribbon is shown as the outer peripheral side when wound around the bobbin. In the figure, a sheared surface having an oblique-line-shaped machining mark at the center portion in the thickness direction of the thin strip was confirmed.

Fig. 11 is a schematic view of fig. 10. In the figure, B is a shear plane. B2 is a shear surface on which a linear machining mark can be observed in the moving direction of the cutting blade, and B1 is a shear surface on which the mark cannot be observed. Further, a is a sagging surface, C is a fracture surface, and D is a flash surface.

The amorphous metal ribbon of the present embodiment is an amorphous metal ribbon having a shear surface formed by machining on a machined surface of the ribbon, and the contour of the surface of the ribbon on the sag surface side has a corrugated shape on the machined surface.

The corrugated profile is formed with a period of 5.2 μm on average.

Further, the shear plane accounts for 70.4% of the working plane.

In the amorphous metal ribbon according to the present embodiment, the width of the entire photograph of fig. 10 is 45 μm, and the contour of the shear surface on the sag surface side has a wavy shape relative to the contour of the sag surface side on the ribbon surface.

FIG. 12 is a photograph of the processed surface of the amorphous metal ribbon of comparative example No.8 in Table 1. The magnification is 500 times. Fig. 13 is an enlarged photograph of fig. 12. The magnification is 3000 times. In the figure, the upper side of the thin strip is wound around the bobbin. In the figure, a sheared surface having an oblique-line-shaped machining mark at the center portion in the thickness direction of the thin strip was confirmed.

Fig. 14 is a schematic view of fig. 13. In the figure, B is a shear plane. Further, a is a sagging surface, C is a fracture surface, and D is a burr surface.

Unlike the present embodiment, the amorphous metal ribbon for comparison has a flat profile on the sag side of the ribbon surface, and is not of a corrugated type. Further, the contour of the shear surface on the sagging side is not a shape related to the contour of the sagging side of the thin strip surface.

The proportion of the shear plane was very small at 27.2%.

(example 2)

In example 2, the strength of the applied ac magnetic field was changed, and the machining yield was examined.

The amorphous metal ribbon is machined using the apparatus described in fig. 1. The frequency of magnetostrictive vibration was 30 kHz. Further, an alternating current is caused to flow through the coil so that the maximum value of the alternating magnetic field generated in the coil is 30A/m, 70A/m, 100A/m, or 130A/m. In this case, the amorphous metal thin strip is magnetostrictively vibrated at 12ppm, 16ppm, 18ppm, and 19.8ppm magnetostriction.

Except for this, the yield was examined under the same conditions as in embodiment 1.

In the range of the intensity of the ac magnetic field, the yields of the embodiments of nos. 1 to 4, which were machined while causing the amorphous metal ribbon to magnetostrictively vibrate, were all 60% or more on the outer peripheral side and 70% or more on the inner peripheral side, and the yields were improved in all the embodiments as compared with the yield of the comparative example of No.8 in table 1.

In the range of the intensity of the ac magnetic field, the higher the intensity of the magnetic field, the higher the yield of machining tends to be.

[ Table 2]

No	f(kHz)	H(A/m)	Out(％)	In(％)	Presence or absence of heat generation
						1	30	30	60	70	Is free of
2	30	70	70	80	Is free of
						3	30	100	90	90	Is free of
4	30	130	100	100	Is free of

(example 3)

The amorphous metal ribbon is machined using the apparatus described in fig. 1.

The bobbin 5 is the same bobbin as that used in embodiment 1. The slit amorphous metal thin strip 1 was wound around the bobbin in the circumferential direction for 4 turns.

An alternating current of 30kHz is supplied from an alternating current power supply 3 to an amplifier 4, and the current is amplified by the amplifier 4 so that the maximum value of an alternating magnetic field generated in the coil (14 turns) is 180A/m, and the alternating current flows in the coil 2. In this case, the amorphous metal ribbon is magnetostrictively vibrated at 24ppm magnetostriction.

Except for this, the yield of machining was examined under the same conditions as in embodiment 1.

As a result, all 4 layers can be cut without generating cracks or cracks.

In comparison, the yield of machining was examined in a state where no ac current was passed through the coil 2 and no magnetostrictive vibration was caused, and the insertion of the cutting blade 6 into the amorphous metal ribbon was deteriorated, and cracks or fissures occurred in a wide range in all of the 4 layers, as compared with the above-described embodiment. The yield was 90% in the case where an alternating-current magnetic field was generated, and 0% in the case where no magnetic field was generated.

In examples 1 to 3, the FeSiB-based amorphous metal ribbon having soft magnetism was used, but the amorphous metal ribbon capable of nano-crystallization has the same degree of saturation magnetostriction before nano-crystallization, and therefore the same effects can be expected by applying the present invention.

In examples 1 to 3, the amorphous metal ribbon was subjected to a slitting machine, and for example, a long ribbon was cut or punched to form a plurality of processed ribbons having the same shape, and these ribbons were laminated.

(example 4)

In example 4, an amorphous metal ribbon machined according to the method for machining an amorphous metal ribbon according to the above-described embodiment (a method for machining a portion of an amorphous metal ribbon to which vibration is locally applied by a machining tool and repeated fatigue due to the vibration is applied) was obtained.

Cooling the alloy by a roller to produce an alloy with the composition of Fe atom%_81.5Si₄B_14.5The amorphous metal ribbon of (a). A thin amorphous metal ribbon having a thickness of 22.7 μm was prepared. The thickness of the ribbon is calculated from the density, weight and dimensions (length x width). Further, the width of the thin strip was 80 mm.

As the punching apparatus, an apparatus shown in fig. 3 was used.

As the punching die, a superhard material (Fuji Roy (フジロイ) VF-12 material manufactured by Fuji die Co., Ltd.) was used together with the

punches

8a and 8b and the

punch holders

9a and 9 b. The punch was a column having a rectangular front end and a size of 5X 15mm, and the corner was processed at the R-angle (R-portion 0.3 mm). The die is formed with a machining hole into which the punch is inserted. Further, the

punches

8a, 8b and the

punch holders

9a, 9b respectively hold the amorphous metal thin strip 1, and the

punches

8a, 8b vibrate in the thickness direction. The vibration of the

punches

8a and 8b is ultrasonic vibration caused by an ultrasonic wave generating device. Further, the

punches

8a and 8b and the punch holders 9a and 9 are slidable in the thickness direction of the amorphous metal ribbon.

The 1 amorphous metal thin strip is held by the

punch holders

9a and 9b and the

punches

8a and 8 b. In this state, the

punches

8a and 8b are ultrasonically vibrated, and repeated fatigue due to vibration is applied to the amorphous metal ribbon at the slide portions of the punch holder and the punches. Thereafter, the

punches

8a and 8b are operated under the load 1400N without changing the ultrasonic vibration of the

punches

8a and 8b, and punching is performed. By using the machining method of performing machining while vibrating the amorphous metal ribbon, an amorphous metal ribbon having the side surface portion of the ribbon machined is obtained.

Fig. 15 is a photograph of the processed surface (side surface portion) of the amorphous metal ribbon obtained in example 4. The magnification is 500 times. Fig. 16 is a schematic view of fig. 15. In the figure, a sheared surface having an oblique-line-shaped machining mark at the center portion in the thickness direction of the thin strip was confirmed.

The fracture surface of the amorphous metal ribbon occupied 73.4% of the area of the machined surface (side surface) of the machined ribbon.

For comparison, a machined amorphous metal ribbon was obtained in the same manner as in example 4, except that the

punches

8a and 8b were not vibrated.

Fig. 17 is a photograph of the processed surface (side surface portion) of the obtained amorphous metal ribbon. Fig. 18 is a schematic view of fig. 17. In general, a cross section formed by punching has a sagging surface a (hatched portion), a shear surface B (vertical portion), a fracture surface C (white portion), and a burr D (gray portion).

However, unlike the present embodiment, the amorphous metal ribbon for comparison has a flat profile on the sag side of the ribbon surface, and is not corrugated. In addition, the ratio of the fracture surface in the machined surface was less than 70% (46.2%), and very small. The proportion of the machined surface to the sheared surface was 48.0%.

In example 4, the FeSiB-based amorphous metal ribbon having soft magnetism is used, but the same effect can be expected by applying the present invention to the above-described amorphous metal ribbon capable of being crystallized.

In the above embodiment, the method of machining can be applied to a method of performing punching by stopping ultrasonic vibration of the

punches

8a and 8b after repeated fatigue due to vibration of the amorphous metal ribbon, that is, performing machining after vibrating the amorphous metal ribbon.

Description of reference numerals

1: amorphous metal ribbon

2: coil

3: AC power supply

4: amplifier with a high-frequency amplifier

5: bobbin

6: machining tool

7: unreeling roller

8: punching machine

9: punching frame

10: crack(s)

11: crack (crack)

12: cutting trace

A: collapsed edge surface

B: shear plane

C: fracture surface

D: and (5) rough edge surfaces.

Claims

1. A processing method of an amorphous metal thin strip is characterized by comprising the following steps:

2. The method of processing the amorphous metal ribbon of claim 1, wherein:

the amorphous metal ribbon has a saturation magnetostriction of 1ppm or more, and the vibration is vibration caused by the magnetostriction of the amorphous metal ribbon.

3. The method of processing the amorphous metal ribbon of claim 1 or 2, wherein:

the frequency of the vibration is 1Hz to 500kHz inclusive.

4. The method of processing the amorphous metal ribbon of claim 2 or 3, wherein:

the vibration is generated by applying an alternating-current magnetic field of 1A/m or more to the amorphous metal thin strip.

5. The method of processing the amorphous metal ribbon of claim 1, wherein:

the amorphous metal thin strip is machined at a portion where vibration is locally applied by a machining tool.

6. The method of processing the amorphous metal ribbon of claim 5, wherein:

the processing tool comprises a punch and a punch holder capable of holding the upper and lower surfaces of the amorphous metal thin strip,

at least one of the punch and punch holder is slidable in a thickness direction of the thin amorphous metal strip,

the upper and lower surfaces of the amorphous metal ribbon are held between the punch and the punch holder, and at least one of the upper and lower surfaces vibrates in the thickness direction, and the amorphous metal ribbon is vibrated at a portion of the amorphous metal ribbon located at a sliding portion of the punch and the punch holder, and a portion subjected to repeated fatigue due to the vibration is punched by the punch.

7. The method of processing the amorphous metal ribbon of any one of claims 1 to 6, wherein:

the amorphous metal thin strip is in a strip shape,

machining the amorphous metal ribbon while conveying the amorphous metal ribbon in the direction of the ribbon.

8. The method of processing the amorphous metal ribbon of any one of claims 1 to 7, wherein:

the amorphous metal ribbon contains Fe as a main component, which is produced by roll cooling.

9. The method of processing the amorphous metal ribbon of any one of claims 1 to 8, wherein:

the thickness of the amorphous metal ribbon is 5-70 μm.

10. The method of processing the amorphous metal ribbon of any one of claims 1 to 9, wherein:

the Vickers hardness HV of the amorphous metal ribbon is 500 or more.

11. A method for manufacturing a laminate, characterized in that:

the amorphous metal ribbon processed by the processing method for laminating the amorphous metal ribbon according to any one of claims 1 to 10.

12. An amorphous metal ribbon having a shear plane formed by machining on a working surface of the ribbon, characterized in that:

on the machining surface, the profile of the roll off surface side of the thin strip surface has a corrugated shape.

13. The amorphous metal ribbon of claim 12 wherein:

the corrugated profile has unevenness with a period of 0.1 to 20 μm on average.

14. The amorphous metal ribbon of claim 12 or 13, wherein:

the shear plane occupies 40% or more of the area of the working surface.

15. The thin amorphous metal strip of any one of claims 12 to 14 wherein:

the profile of the shear surface on the roll off side has an associated wave pattern relative to the profile of the roll off side of the thin strip surface.

16. An amorphous metal ribbon having a shear plane formed by machining on a working surface of the ribbon, characterized in that: