JP2023015164A - amorphous metal ribbon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method that can suppress cracking and breaking from occurring in an amorphous metal ribbon, in machining the amorphous metal ribbon.

SOLUTION: An amorphous metal ribbon is machined after vibrating the ribbon or while vibrating the ribbon, so as to suppress cracking and breaking from occurring in the amorphous metal ribbon. The amorphous metal ribbon is obtained which has a sheared surface by machining on a machined surface of the amorphous metal ribbon, in which areas of a fractured surface occupy 50% or more of whole areas on a machined surface of the machined amorphous metal ribbon.

SELECTED DRAWING: Figure 16

COPYRIGHT: (C)2023,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to an amorphous metal ribbon, a processing method thereof, and a method of manufacturing a laminate.

Amorphous metal ribbons are utilized in various fields. For example, amorphous metal ribbons having soft magnetism are used in fields such as information equipment, automobiles, home appliances/consumer appliances, and industrial machinery. It is used as a useful material for improving the efficiency and gain of magnetic antennas and noise countermeasure parts.

Amorphous metal ribbons are generally known to have high hardness and low ductility. For example, an amorphous metal thin ribbon having soft magnetism is usually produced in a long strip shape by quenching molten metal by a single roll method or the like. The mainstream ribbon has a thickness of 5 to 70 μm. These metal strips have a Vickers hardness HV of 500 or more. Therefore, amorphous metal ribbons have the disadvantage that they are extremely difficult to machine.
Conventionally, these amorphous metal ribbons have been mainly applied to wound magnetic cores wound in a toroidal shape, which can be produced almost without machining. In recent years, in addition to wound magnetic cores, lamination of amorphous metal thin strips has been investigated for use as magnetic members in rotating machines, reactors, antennas, and the like.

Since the amorphous metal ribbons are manufactured in the form of ribbons, when laminating the amorphous metal ribbons to form a laminate, the belt-shaped amorphous metal ribbons are processed into a predetermined shape. Then, a process of laminating it may be taken. Etching processing, electric discharge processing, laser processing, and the like are available as means for processing the amorphous metal ribbon into a predetermined shape. However, these processing methods have extremely low processing efficiencies and pose problems in industrial production. In addition, since the amorphous metal ribbon is fragile, cracks and cracks cannot be avoided, and there is also the problem that the processing yield is poor.

Machining such as punching, cutting, etc., in which a mold or a working tool is moved in the thickness direction, is a versatile working method for an amorphous metal ribbon. However, machining an amorphous metal ribbon as a work piece is more likely to cause cracks and cracks than the above working methods.

As a countermeasure, for example, Patent Document 1 is an invention based on the premise of punching an amorphous metal ribbon, and is a laminated plate in which a plurality of soft magnetic metal ribbons having a thickness of 8 to 35 μm are laminated. and forming a thermosetting resin with a predetermined thickness between the metal strips. In addition, it is described that, as an effect thereof, it is excellent in punching workability and can easily provide a high-performance laminate.

Japanese Patent Application Laid-Open No. 2008-213410

However, as countermeasures against cracks and cracks, it is necessary not only to consider reinforcing the mechanical strength with a member other than the amorphous metal ribbon as in Patent Document 1, but also to consider measures to improve the machining itself.

An object of the present invention is to provide a method capable of suppressing cracks and fractures occurring in the amorphous metal ribbon during machining of the amorphous metal ribbon. Another object of the present invention is to provide a method for producing a laminate using the amorphous metal ribbon. Another object of the present invention is to provide an amorphous metal ribbon obtained by the machining.

The present invention is a method for processing an amorphous metal ribbon,
Machining is performed after or while vibrating the amorphous metal ribbon.

In the present invention, the amorphous metal ribbon has a saturation magnetostriction of 1 ppm or more, and the vibration may be vibration due to magnetostriction of the amorphous metal ribbon.
The vibration may have a frequency of 1 Hz or more and 500 kHz or less.
The vibration can be generated by applying an alternating magnetic field of 1 A/m or more to the amorphous metal ribbon.
The amorphous metal ribbon has a long strip shape, and can be machined while being transported in the long direction.

In the above invention,
A portion of the amorphous metal ribbon that is locally vibrated by a processing tool can be machined.
The processing tool includes a puncher and a punch frame capable of holding the upper and lower surfaces of the amorphous metal ribbon, and at least one of the puncher and the punch frame slides in the thickness direction of the amorphous metal ribbon. The puncher and the punch frame are movable, and the upper and lower surfaces of the amorphous metal ribbon are sandwiched, and at least one of them vibrates in the thickness direction, thereby forming the amorphous metal ribbon. A processing method may be provided in which vibration is applied to the amorphous metal ribbon at a portion located at a sliding portion between the puncher and the punch frame, and the portion repeatedly fatigued by the vibration is punched by the puncher. can.

As the amorphous metal ribbon, one having 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.

A laminate can be obtained by laminating amorphous metal ribbons processed by these amorphous metal ribbon processing methods.

The following amorphous metal ribbon of the present invention is obtained by the above method for processing the amorphous metal ribbon.
What is claimed is: 1. An amorphous metal ribbon having a sheared surface formed by machining on the working surface of the ribbon, wherein the working surface has a corrugated contour on the sagging surface side of the ribbon surface.
The corrugated outline can have irregularities with an average period of 0.1 to 20 μm.
Further, the sheared surface may occupy 40% or more of the processed surface.
Further, the contour of the sheared surface on the side of the sagging surface may have a corrugated shape that correlates with the contour of the surface of the ribbon on the side of the sagging surface.

Another amorphous metal ribbon of the present invention is as follows.
An amorphous metal ribbon having a sheared surface formed by machining on the processed surface of the ribbon,
An amorphous metal ribbon in which a fractured surface occupies 50% or more of an area of a machined surface of the ribbon.

Effect of the Invention According to the present invention, it is possible to suppress the occurrence of cracks and fractures in the amorphous metal ribbon during machining of the amorphous metal ribbon. Therefore, it is possible to obtain machined amorphous metal ribbons with high dimensional accuracy, and further to obtain laminates by laminating them.

It is a schematic diagram of the processing apparatus used for this invention. It is a schematic diagram of another processing apparatus used for the present invention. It is a schematic diagram of another processing apparatus used for the present invention. It is a schematic diagram of another processing apparatus used for the present invention. FIG. 2 is a schematic diagram of an amorphous metal ribbon after machining without any cracks or fissures judged to be acceptable. FIG. 3 is a schematic diagram of an amorphous metal ribbon after machining having cracks and splits judged to be rejected. 4 is a BH loop showing the soft magnetic properties of the amorphous metal ribbon used in the embodiment. 8 is an enlarged view of part of the horizontal axis of FIG. 7; FIG. 2 is a photograph of the processed surface of the amorphous metal ribbon of Example 1 (No. 2 in Table 1). FIG. 10 is an enlarged photograph of FIG. 9; FIG. 11 is a schematic diagram of FIG. 10; It is a photograph of the machined surface of an amorphous metal ribbon for comparison (No. 8 in Table 1). FIG. 13 is an enlarged photograph of FIG. 12; FIG. 14 is a schematic diagram of FIG. 13; 10 is a photograph of the processed surface of the amorphous metal ribbon of Example 4. FIG. FIG. 16 is a schematic diagram of FIG. 15; FIG. 11 is a photograph of a processed surface of another amorphous metal ribbon for comparison; FIG. FIG. 18 is a schematic diagram of FIG. 17;

Although the present invention will be specifically described by means of embodiments, the present invention is not limited by these embodiments.

An embodiment of the present invention is a method for processing an amorphous metal ribbon,
Machining is performed after or while vibrating the amorphous metal ribbon.
Amorphous metal ribbons are materials with extremely high fracture toughness. Therefore, when the ribbon starts to break during machining, a large plastic deformation occurs at the tip of the fracture crack, resulting in a large impact between the amorphous metal ribbon and the working tool. In addition, since the amorphous metal ribbon has extremely high hardness as described above, cracks and fractures are likely to occur at the cut portion due to the impact. Especially when processing into a complicated shape, cracks and cracks are likely to occur at corners with small curvatures.
However, in the present invention, it has been found that the problem can be suppressed by adopting the above processing method.

The mechanism by which the effects of the present invention are obtained is speculated below.
In general, glass is cut by scribing scratches on the surface, and using the scribing scratches as starting points, a processing method mainly employing elastic fracture in which cracks are propagated is often adopted. The arrangement of atoms in the entire glass mainly consists of covalent electronic bonds, and since glass is hard at all sites, the above processing method can be employed.
Amorphous metal ribbons, which are also called metallic glasses, have atoms arranged randomly like glass. However, unlike general glass, the bonding form between transition metals (e.g., between Fe and Fe) is mainly metallic bonding, but in the bonding including semimetals (metalloid elements), it becomes covalent electronic bonding, and the atomic level of ribbons The hardness varies depending on the location. In addition, in metals (alloys), there are many spaces where atoms exist called free volumes (lattice defects in the crystal phase), and atoms can move through these free volumes, allowing large plastic deformation. . On the other hand, the surface of the ribbon has no free volume and is very hard. Therefore, it is presumed that it is difficult to apply the same processing method as for glass to the amorphous metal ribbon, and that it must be machined by shear deformation.
Therefore, the present inventor has conceived of a machining method for machining after vibrating the amorphous metal ribbon or while vibrating it. Here, machining the amorphous metal ribbon while vibrating includes machining the amorphous metal ribbon while vibrating a working tool.

The above processing method is considered to have the following effects (1) to (3).
(1) By vibrating the amorphous metal ribbon, the brittleness of the amorphous metal ribbon can be increased. Therefore, by performing machining after vibration, it is possible to improve workability compared to the one that is not vibrated.
(2) By vibrating the amorphous metal ribbon, the brittleness of the amorphous metal ribbon can be increased. Therefore, by performing machining while vibrating the working tool, that is, by performing machining while vibrating the amorphous metal ribbon, it is possible to improve the machinability of the material that is not vibrated.
(3) By machining the amorphous metal ribbon while vibrating it, the amorphous metal ribbon is relatively vibrated when it comes into contact with the working tool, so that the amorphous metal ribbon is hard. Machining begins in the same state as when the surface is polished, enabling high-precision machining. After that, the inside of the strip is shear-deformed by machining.

Note that when a sharp cutting blade is used as the processing tool, the cutting blade is usually pressed against the workpiece and is cut by relatively moving in that state. In this case, it is necessary to move the cutting blade and the workpiece by a predetermined distance in a predetermined direction. In addition, it is extremely difficult to process curves and complicated shapes.
When using vibration as in the present invention, it is known that the cutting edge of the cutting edge is microscopically sawtooth-shaped. Vibration can generate a notch in the surface of the workpiece without moving the workpiece and the cutting blade a relatively long distance.

In addition, as a secondary effect, the present invention can be expected to extend the working tool life. The reduced indentation speed greatly reduces the impact of being slammed into a hard ribbon surface.

In the present invention, machining refers to a known machining method of machining a workpiece using a machining tool or machine tool. Examples include punching, shearing, cutting, and slitting.

A specific method for processing the amorphous metal ribbon will be described below.
In an embodiment of the present invention, the amorphous metal ribbon has a saturation magnetostriction of 1 ppm or more, and the vibration may be vibration due to magnetostriction of the amorphous metal ribbon.

The feature of this processing method is that the amorphous metal ribbon is not vibrated by external stress, but is vibrated by magnetostriction by applying an alternating magnetic field. By vibrating in this manner, only the amorphous metal ribbon can be easily vibrated. Therefore, the workpiece can be vibrated with less energy than vibrating the machining tool. Moreover, since the amorphous metal ribbon itself becomes a vibration source, it can be reliably vibrated, and the effect of suppressing cracks and cracks can be enhanced. In other words, when processing a laminate of amorphous metal ribbons sandwiching a resin, if the vibration is caused by external stress, the vibration is absorbed by the resin, and the amorphous metal on the inner side in the stacking direction is absorbed. Although there is a possibility that sufficient vibration is not imparted to the thin metal strip, even with such a workpiece, the effect of suppressing cracks and cracks of the present invention can be obtained by vibrating the thin amorphous metal strip. Cheap.
A feature of this processing method is that the amorphous metal ribbon is vibrated in multiple directions. In this embodiment, since the amorphous metal ribbon is vibrated by magnetostriction, vibration due to compression/expansion occurs in the direction in which the magnetic field is applied, and vibration due to expansion/compression is generated in the direction perpendicular to the direction in which the magnetic field is applied. occur simultaneously. In other words, regardless of the direction in which the working tool and the amorphous metal ribbon come into contact with each other, the two are in a state of stable relative sliding rather than single-directional vibration, so cracks and cracks do not occur. It is easy to obtain an inhibitory effect.

In addition, this processing method is easier to process than conventional machining. The reason is described below.
Most of the amorphous metal strips are produced by roll quenching from the viewpoint of industrial productivity. Roll quenching is a method in which a molten liquid metal is dropped on a roll made of a highly heat-conductive metal (for example, a Cu alloy), brought into close contact with the roll, and rapidly solidified. Roll quenching is widely applied as a casting method for amorphous metal strips because it can provide a very high cooling rate of about 1×10 ⁵ to 1×10 ⁷ ° C./s.
However, since the molten metal is solidified in an extremely short time, irregularities are likely to occur on the surface of the ribbon reflecting partial non-uniformity of the cooling rate. When these ribbons are stacked and punched at the same time, the protrusions on the surface of one of the ribbons easily come into contact with the surface of the opposing ribbon and are less likely to slip in the in-plane direction. On the other hand, since the concave portion tends to slip, the stress from the processing tool is dispersed, making it difficult to process along the shape of the blade of the processing tool.
In particular, since the amorphous metal ribbon has a high hardness, it is necessary to increase the relative speed with the processing tool during machining. Defects that deviate from the cutting line occur.
In the method for processing an amorphous metal ribbon according to the present embodiment, since the ribbon is machined while vibrating, the two move relatively and positively, so that a fine notch is formed from the portion with which the processing tool abuts. From there, shear deformation can proceed. As a result, even the recessed portions of the thin ribbon are fixed by the binding force of the surrounding portions where the binding is strong, and the cutting is facilitated.

In this embodiment, the amorphous metal ribbon used has a saturation magnetostriction of 1 ppm or more. If the saturation magnetostriction is less than 1 ppm, sufficient vibration is not generated and the effect of the present invention is difficult to obtain. The saturation magnetostriction is preferably 3 ppm or more, more preferably 5 ppm or more, more preferably 10 ppm or more, and more preferably 15 ppm or more.

The vibration preferably has a frequency of 1 Hz or more and 500 kHz or less. If the frequency is less than 1 Hz or more than 500 kHz, it is difficult to obtain the effect of suppressing cracks and cracks.
The lower limit of the frequency is preferably 10 Hz, more preferably 100 Hz, and more preferably 1 kHz. The upper limit of the frequency is preferably 400 kHz, more preferably 300 kHz, more preferably 80 kHz, more preferably 60 kHz, and more preferably 40 kHz.

The vibration is preferably generated by applying an alternating magnetic field of 1 A/m or more to the amorphous metal ribbon. When the lower limit of the alternating magnetic field is less than 1 A/m, it is difficult to obtain the effect of suppressing cracks and cracks.
The lower limit of the alternating magnetic field is preferably 10 A/m, more preferably 30 A/m, more preferably 70 A/m, more preferably 100 A/m, and more preferably 130 A/m.

Further, the amorphous metal ribbon has a long strip shape, and can be machined while being transported in the long direction. In addition, when carrying out machining while transporting, it is also possible to stop the movement of the amorphous metal ribbon during machining, and resume the movement after machining, so that machining can be carried out continuously. .
It is known that ribbons during transport are prone to breakage. When the ribbon is vibrated by external stress, there is a concern that the ribbon being transported is more likely to break around the location where the stress is applied. On the other hand, when vibrating with magnetostriction, the magnetic flux flows in the in-plane direction of the amorphous metal ribbon, making it difficult to generate local internal stress. It is possible to suppress the ribbon from being cut.

In the present invention, the object to be processed is limited to the amorphous metal ribbon, but in the processing method of the present embodiment, it is not limited to that, and the object having magnetostriction other than the amorphous metal ribbon Even if it is a material, the effect of suppressing cracks and cracks can be obtained.
That is, as another invention, there is provided a method for machining a thin metal strip, wherein at least one of the thin metal strip and a working tool used for processing is subjected to machining while applying vibration,
The metal ribbon has a saturation magnetostriction of 1 ppm or more, and the vibration is caused by the magnetostriction of the metal ribbon, thereby providing a metal ribbon processing method having the same effect as the present invention. .

An amorphous metal ribbon according to the following embodiment is obtained by the method for processing the amorphous metal ribbon described above.
The amorphous metal ribbon of the present embodiment is an amorphous metal ribbon having a sheared surface formed by machining on the working surface of the ribbon, and in the working surface, the outline of the sagging surface side of the ribbon surface is It is wavy. The processed surface corresponds to a punched surface (side surface) or a cut surface (cut surface) in punching or cutting.
Specifically, the corrugated outline can have irregularities with an average period of 0.1 to 20 μm. The reason why the unevenness exists at a period of 0.1 to 20 μm is presumed as follows. In this magnetostriction oscillation method, the polarity of the magnetic field is switched at intervals of several tens of kHz. In other words, the positive magnetization state and the negative magnetization state are switched at high frequencies. Magnetostriction also increases in the magnetized state, and magnetostriction becomes zero in the state of zero magnetization. This high-speed magnetization reversal is caused by domain wall motion, and the domain wall is the place where the magnetostriction is the smallest. The magnetic domain width (interval between domain walls, about twice the domain wall displacement distance) is 0.2 to 40 μm so that high-speed magnetization reversal can be followed. It is assumed that the blade moves like a saw because the domain wall, which has a different volume than the surroundings, moves while being pressed down by the blade from the top. The method for measuring the average period of unevenness is to measure the distance between the deepest portions of adjacent concave portions at least five points, and measure the average value of the distances. As for the unevenness, one unevenness is defined as a difference of 0.3 μm or more in height between the concave portion and the convex portion in the thickness direction of the ribbon.
Further, in the amorphous metal ribbon of the present embodiment, the sheared surface may occupy 40% or more of the processed surface. The sheared surface may occupy 50% or more, even 60% or more, or even 65% or more of the area. The numerical value of the area occupied by the shear plane on the processed surface can be calculated by the following measurement method. First, the ribbon thickness T (T1, T2, . . . Tn) and the sheared surface width W (w1, w2, . . . After that, wsum/Tsum×100 (%) is 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 with five arbitrary measurement points in the range of 450 μm in width of the processed surface.
In addition, in the amorphous metal ribbon of the present embodiment, the profile of the sheared surface on the side of the sagging surface may have corrugations that correlate with the profile of the surface of the ribbon on the side of the sagging surface on the processed surface. The correlative corrugations refer to those in which variations in the cycle of the unevenness (interval between the deepest portions of adjacent recesses) appear in the same manner in both contours. The reason why there is a correlation between the contours of both waveforms is presumed to be as follows. As described above, the origin of this periodicity is thought to depend on the distance between domain walls. The magnetostriction seen here is linear magnetostriction, and a region with a magnetostrictive state different from the surroundings near the domain wall spreads in the vertical direction. It is thought that the contours of the two are very similar because of repeated volumetric fluctuations.

Another embodiment of the method for processing an amorphous metal ribbon according to the present invention will be described. In this embodiment, a means for machining a portion of the amorphous metal ribbon which is locally vibrated by a working tool is used.
According to this embodiment, since the portion with increased brittleness is machined, workability can be improved, and the effect of suppressing cracks and cracks can be easily obtained.

In this embodiment, for example, the processing tool is provided with a puncher and a punch frame capable of clamping the upper and lower surfaces of the amorphous metal ribbon,
At least one of the puncher and the punch frame is slidable in the thickness direction of the amorphous metal ribbon,
The puncher and the punch frame sandwich the upper and lower surfaces of the amorphous metal ribbon, and at least one of them vibrates in the thickness direction, so that the amorphous metal ribbon slides between the puncher and the punch frame. A step of applying vibration to the amorphous metal ribbon at the portion located in the region and punching the portion repeatedly fatigued by the vibration with the puncher can be employed.

According to this embodiment, the following amorphous metal ribbon is obtained.
The amorphous metal ribbon of this embodiment is an amorphous metal ribbon having a sheared surface formed by machining on the working surface of the ribbon. % or more of the area. The fracture surface may occupy 60% or more, or even 65% of the area.
The numerical value of the area occupied by the fracture surface on the processed surface can be calculated by the following measuring method. First, the ribbon thickness T (T1, T2, . . . , Tn) and the fracture surface width W (W1, W2, . After that, Wsum/Tsum×100 (%) is 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 with five arbitrary measurement points in the range of 450 μm in width of the processed surface.

The amorphous metal ribbon used in this embodiment will be described below.
The method for producing the amorphous metal ribbon is not particularly limited.
For example, a material having Fe as a main component produced by roll cooling can be used. In addition, a main component is a component with the largest content.

For example, when the total amount of Fe, Si and B is 100 atomic %, the amorphous metal ribbon of the present embodiment contains 0 atomic % or more and 10 atomic % or less of Si and 10 atomic % or more and 20 atomic % of B. It is possible to use one having a composition in which the content is atomic % or less and the balance is composed of Fe.
If the amount of Si and the amount of B are out of this range, it becomes difficult to form an amorphous alloy during production by roll cooling, and mass productivity tends to decrease. Elements other than Fe, Si, and B, such as Mn, S, C, and Al, may be included as additives or unavoidable impurities. The amorphous metal ribbon preferably has the above composition, is amorphous without a crystal structure, and is preferably a soft magnetic material. In addition, the amount of Si is preferably 3 atomic % or more and 10 atomic % or less. Moreover, the amount of B is preferably 10 atomic % or more and 15 atomic % or less. In order to obtain a high saturation magnetic flux density Bs, the Fe content is preferably 78 atomic % or more, further 79.5 atomic % or more, further 80 atomic % or more, furthermore 81 atomic % or more. Although the amorphous metal ribbon may contain unavoidable impurities, the total content of Fe, Si and B is preferably 95% by mass or more, more preferably 98% by mass or more. preferable. Incidentally, the amorphous metal ribbon is sometimes referred to as an amorphous alloy ribbon, and is also 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 5 ppm or more and a Vickers hardness HV of 700 or more.

In addition, an amorphous metal ribbon that can be nanocrystallized can also be used. An Fe-based one can be used as the amorphous metal ribbon that can be nanocrystallized. Specifically, as the Fe-based amorphous alloy ribbon, the general formula: (Fe _1-a M _a ) _{100-xyz-α-β-γ} Cu _x Si _y B _z M′ _α M″ _β X _γ (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, a platinum group element, Sc, a rare earth element, Zn, Sn, and Re, and X is C, Ge, P, Ga, Sb, In, Be, and As. At least one element selected from the group a, x, y, z, α, β and γ is 0≤a≤0.5, 0.1≤x≤3, 0≤y≤30, 0≤ satisfying z≦25, 5≦y+z≦30, 0≦α≦20, 0≦β≦20 and 0≦γ≦20). Preferably, in the above general formula, a, x, y, z, α, β and γ are 0≤a≤0.1, 0.7≤x≤1.3, 12≤y≤17, 5≤ The range satisfies z≤10, 1.5≤α≤5, 0≤β≤1 and 0≤γ≤1.
The amorphous metal ribbon having the above composition has a saturation magnetostriction of 5 ppm or more and a Vickers hardness HV of 700 or more.

By subjecting the amorphous metal ribbon capable of nanocrystallization to a heat treatment at a crystallization start temperature or higher, the amorphous metal ribbon is nanocrystallized.
A nanocrystallized alloy has at least 50%, or even 80% by volume, of fine grains with an average grain size measured in the largest dimension of 100 nm or less. Also, the portion of the alloy other than the fine crystal grains is mainly amorphous. The proportion of fine grains can also be substantially 100% by volume.

A long amorphous metal ribbon can be obtained by melting an alloy having these compositions above the melting point and rapidly solidifying the melt by a roll method.

Amorphous metal ribbons having a thickness of 5 μm or more and 70 μm or less can be used. When the thickness is less than 5 μm, the mechanical strength of the amorphous metal ribbon is insufficient, and handling during machining and continuous transport in the longitudinal direction tend to be difficult. The thickness is preferably 15 μm or more, more preferably 20 μm or more. On the other hand, if the thickness of the ribbon exceeds 70 μm, depending on the composition, it tends to be difficult to stably obtain an amorphous phase in the ribbon. The thickness is preferably 50 μm or less, more preferably 35 μm or less, and even more preferably 30 μm or less.

An embodiment of the apparatus for machining will now be described.
For example, the apparatus shown in FIGS. 1, 2 and 3 can be used. However, devices that can be used in the present invention are not limited to these.

The apparatus shown in FIG. 1 is a schematic diagram of an apparatus for applying a method for processing an amorphous metal ribbon according to an embodiment (machining an amorphous metal ribbon having magnetostriction while vibrating the magnetostrictive amorphous metal ribbon).
The apparatus shown in FIG. 1 comprises an amorphous metal ribbon 1, a coil 2 wound so that a magnetic flux flows through the amorphous metal ribbon 1, and a machine capable of machining the amorphous metal ribbon 1. A tool 6 is provided. The coil 2 is fed with an alternating current that is amplified by an amplifier 4 and that flows from an alternating current power supply 3 .
In the embodiment of FIG. 1, a long amorphous metal ribbon 1 is wound in the circumferential direction around an annular bobbin 5 having flexibility at least on the outer peripheral side. The processing tool 6 is a cutting blade. The processing tool 6 is movable in the radial direction of the bobbin 5, and when moved toward the bobbin, the tip of the cutting blade can come into contact with the amorphous metal strip 1 wound around the peripheral surface of the bobbin 5. is. Further, it is constructed so as to bite into the flexible material on the outer peripheral side of the bobbin 5 and move to the inner diameter side from the outer peripheral surface of the bobbin.

A method of using the apparatus of FIG. 1 will be described. An alternating current is passed through the coil 2 to generate an alternating magnetic field in the axial direction of the coil. vibrate. By pressing the tip of the cutting blade 6 against the surface of the amorphous metal ribbon 1 while maintaining this state, the amorphous metal ribbon 1 is machined by cutting, slitting, punching, or the like.

In the embodiment of FIG. 1, the amorphous metal ribbon 1 wound around the bobbin does not have to be annular, and may be arc-shaped. In that case, a yoke may be used to circulate the magnetic flux flowing through the amorphous metal ribbon.

The apparatus of FIG. 2 is another apparatus for applying to the method of processing an amorphous metal ribbon of the embodiment (machining an amorphous metal ribbon having magnetostriction while vibrating the magnetostrictive amorphous metal ribbon) in the same manner as in FIG. It is a schematic diagram of.
2, as in FIG. 1, the amorphous metal ribbon 1, the coil 2 wound so that the magnetic flux flows through the amorphous metal ribbon 1, and the amorphous metal ribbon 1 are machined. Equipped with a processing tool capable of
In the embodiment of FIG. 2, the processing tools are a puncher for punching 6a and a punch frame 6b for punching. A portion of the elongated amorphous metal ribbon 1 is arranged at a position where it can be punched by the processing tools 6a and 6b. In the figure, a long amorphous metal ribbon 1 is unwound from a winding roll 7 and conveyed to working tools 6a and 6b. The processing tools 6a and 6b punch out the transported amorphous metal strip 1. As shown in FIG. As a result, the amorphous metal ribbon 1 can be machined while being continuously transported.
In the drawing, the coil 2 is formed so that its axial direction is parallel to the longitudinal direction of the amorphous metal ribbon 1 .
The AC power supply 3 and the amplifier 4 have the same configuration as in FIG. 1, and the description thereof is omitted.

A method of using the apparatus of FIG. 2 will be described. As in FIG. 1, by passing an alternating current through the coil 2, an alternating magnetic field is generated in the axial direction of the coil, and an alternating magnetic flux is caused to flow through the amorphous metal ribbon 1 arranged inside the coil, thereby The metal strip 1 is magnetostrictively vibrated. By sliding the working tools 6a and 6b while maintaining this state, punching is performed.

In the embodiment shown in FIG. 2, the yoke 8 is used to return the magnetic flux flowing through the amorphous metal ribbon.

The apparatus of FIG. 3 is applied to the processing method of the amorphous metal ribbon of the embodiment (the processing method of machining a portion of the amorphous metal ribbon to which vibration is applied locally by a processing tool). 1 is a schematic diagram of an apparatus for The portion subjected to vibration becomes embrittled due to repeated fatigue. Therefore, machining becomes easier.
The apparatus of FIG. 3 comprises an amorphous metal ribbon 1 and a working tool capable of machining the amorphous metal ribbon 1 . The processing tool includes punchers 8a and 8b and punch frames 9a and 9b capable of clamping the upper and lower surfaces of the amorphous metal ribbon, respectively.

A method of using the apparatus of FIG. 3 will be described. Both the punchers 8a and 8b and the punch frames 9a and 9b are slidable in the thickness direction of the amorphous metal ribbon. Punchers 8a and 8b and punch frames 9a and 9b hold amorphous metal ribbon 1, respectively, and at least one of them vibrates in the thickness direction (the arrows of punch frames 9a and 9b indicate vibration in FIG. 3). As a result, the amorphous metal strip is vibrated at the sliding portions of the punchers 8a and 8b and the punch frames 9a and 9b, and the vibration causes repeated fatigue. After that, as shown in FIG. 4, the punchers 8a and 8b are moved in the thickness direction of the amorphous metal ribbon, so that the amorphous metal ribbon 1 is punched at the portion where repeated fatigue is applied. applied.
The unwinding roll 7 and the amorphous metal ribbon 1 have the same configurations as those in FIG. 2, and the description thereof is omitted.

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

As means for applying vibration to at least one of the amorphous metal ribbon and the working tool used for the working, magnetostrictive vibration by the coil as well as an ultrasonic generator or the like can be used. A known ultrasonic wave generator can be used, and is not particularly limited.

In the method for processing the amorphous metal ribbon described above, at least one surface of the amorphous metal ribbon is coated with a resin or adhered with a resin sheet, and machined into the amorphous metal ribbon. can also be applied.

A laminate can be obtained by laminating the amorphous metal ribbons processed by the method for processing an amorphous metal ribbon described above.

(Example 1)
An amorphous metal strip was machined by the apparatus shown in FIG. Specifically, it was carried out under the following conditions.
The amorphous metal ribbon used was slit to a width of 25 mm.
The amorphous metal ribbon used had a composition of 82 atomic % of Fe, 4 atomic % of Si, and 14 atomic % of B, with 100 atomic % of Fe, Si, and B. In addition, unavoidable impurities such as Cu and Mn are 0.5% by mass or less.
This amorphous metal ribbon has a thickness of 20 μm, a saturation magnetostriction of 27 ppm, and a Vickers hardness HV of 800.
Amorphous metal ribbons with this composition are also known to have high magnetic permeability as soft magnetic materials, and their magnetization easily follows an alternating magnetic field, and the magnetic material itself can be vibrated through the magnetization process. It is possible.

A cutting blade with a sharp tip was used as the processing tool 6 .
A paper tube was used for the bobbin 5 . Since the outer peripheral side of the paper tube is flexible, the tip of the cutting blade can be made to bite into the inner peripheral side rather than the outer peripheral side. The outer diameter of the bobbin is 100mm.
The slit amorphous metal strip 1 was wound twice around the bobbin in the circumferential direction. The magnetic path length of the wound amorphous metal ribbon 1 is about 0.314 m.

The number of turns of the coil 2 was set to 10. An alternating current of 10 kHz to 200 kHz is sent from the alternating current power supply 3 to the amplifier 4, the current is amplified by the amplifier 4, and the alternating current is applied to the coil 2 so that the maximum value of the alternating magnetic field generated by the coil is 70 A / m and 130 A / m. conducted a current.
Under the above conditions, the amorphous metal ribbon 1 is subjected to magnetostrictive vibration, and while maintaining this state, a load of 10 kgf (100 N as if lightly pressed with an arm) is applied to the cutting blade 6, and the tip of the amorphous metal ribbon is cut into the amorphous metal ribbon. It was pressed against the surface of strip 1.
For comparison, machining was performed in the same manner as in Embodiment 1, except that magnetostrictive vibration was not applied.

Under the above conditions, it was confirmed how much magnetostriction occurred in the amorphous metal ribbon.
7 and 8 are BH curves showing the soft magnetism of the amorphous metal ribbons used, and FIG. 8 is a partially enlarged view of the horizontal axis of FIG. As shown in FIG. 7, this amorphous metal ribbon has a magnetic flux density of B=1.5 T at 800 A/m, which is close to the saturation magnetic flux density. Further, as shown in FIG. 8, it can be seen that the magnetic flux density at 130 A/m is B=1.1 T, which is about 73.3% of the saturation magnetic flux density. Since the saturation magnetostriction of this amorphous metal ribbon is 27 ppm, when an alternating magnetic field of 130 A/m is applied to the amorphous metal ribbon, the magnetostriction is 19.8 ppm, which is calculated as 27 ppm × 73.3%. will cause magnetostrictive oscillation.
Similarly, when an alternating magnetic field of 70 A/m is applied to the amorphous metal ribbon, the magnetostrictive vibration is caused by a magnetostriction of 16 ppm.

Table 1 shows the frequency f of the AC power supply 3, the maximum magnetic field intensity H generated by the coil, the pass rate Out for machining the amorphous metal ribbon on the outer peripheral side, and the machine for the amorphous metal ribbon on the inner peripheral side. It shows the pass rate In of processing.
As for the passing rate of machining, as shown in FIG. was rejected. The number of machining experiments was 10 times.

No. 6, which machined the amorphous metal ribbon without causing magnetostrictive vibration. According to the measurement results of No. 8, the pass rate on the outer peripheral side was only 10%, and the pass rate on the inner peripheral side was only 50%.
On the other hand, No. 1 was machined while magnetostrictively vibrating the amorphous metal ribbon. In the embodiments of 1-7, the pass rate on the outer peripheral side was all 60% or more, and the pass rate on the inner peripheral side was all 80% or more, and the pass rate was improved in all the embodiments compared to the pass rate of the comparative example. .
In particular, the frequency of magnetostrictive vibration of No. 10 to 60 kHz. In the embodiments 1-4, all pass rates on the outer peripheral side improved to 80% or more. Furthermore, No. 1 with a frequency of 10 to 40 kHz. In the embodiments 1-3, all pass rates on the outer peripheral side improved to 90% or more. Furthermore, No. 20 to 40 kHz frequency. In Embodiments 2 and 3, the acceptance rate on the inner circumference side both improved to 100%.

Table 1 also shows the presence or absence of heat generation of 40° C. or higher due to induction heating. It can be seen that the pass rate tends to be higher in the embodiment in which there is no heat generation of 40° C. or higher. The reason for this is thought to be that when there is no heat generation, the magnetization follows the magnetic field and the vibration of the magnetic field is efficiently converted into mechanical vibration. On the other hand, when the frequency of the alternating magnetic field increases, a large delay in the response of the magnetization to the magnetic field, that is, a loss occurs, and the loss is released as heat. It is inferred that the loss occurs because the energy of the applied magnetic field is not efficiently converted into the energy of the magnetostrictive vibration.

9 shows No. in Table 1. 2 is a photograph of the processed surface of the amorphous metal ribbon of No. 2. FIG. Magnification is 500 times. FIG. 10 is an enlarged photograph of FIG. The magnification is 3000 times. In the figure, the upper side of the ribbon is the outer peripheral side when wound around the bobbin. In the figure, a sheared surface having oblique machining traces can be confirmed in the central portion of the ribbon in the thickness direction.
FIG. 11 is a schematic diagram of FIG. In the figure, B is the shear plane. B2 is a sheared surface where a linear working mark can be observed in the moving direction of the cutting blade, and B1 is a sheared surface where it cannot be observed. Further, A is a sagging surface, C is a fractured surface, and D is a burr surface.
The amorphous metal ribbon of the present embodiment is an amorphous metal ribbon having a sheared surface formed by machining on the working surface of the ribbon, and in the working surface, the contour of the sagging surface side of the ribbon surface is It has corrugations.
The corrugated profile is formed with an average period of 5.2 μm.
Furthermore, in the processed surface, the shear surface accounts for 70.4%.
Further, in the amorphous metal ribbon of the present embodiment, in the photograph of FIG. 10, the contour of the ribbon surface on the side of the sagging surface has a corrugated shape that correlates with the contour of the surface of the ribbon on the side of the sagging surface. have

12 shows No. in Table 1. FIG. 8 is a photograph of the machined surface of the amorphous metal ribbon of Comparative Example No. 8. FIG. Magnification is 500 times. FIG. 13 is an enlarged photograph of FIG. The magnification is 3000 times. In the figure, the upper side of the ribbon is the outer peripheral side when wound around the bobbin. In the figure, a sheared surface having oblique machining traces can be confirmed in the central portion of the ribbon in the thickness direction.
14 is a schematic diagram of FIG. 13. FIG. In the figure, B is the shear plane. Further, A is a sagging surface, C is a fractured surface, and D is a burr surface.
This amorphous metal ribbon for comparison had a flat contour on the side of the sagging surface of the ribbon surface, unlike the ribbon of the present embodiment, and did not have a corrugated shape. In addition, the contour of the sheared surface on the side of the sagging surface did not correlate with the contour of the surface of the ribbon on the side of the sagging surface.
Moreover, the ratio of the sheared surface is 27.2%, which is very small.

(Example 2)
In Example 2, the strength of the alternating magnetic field to be applied was changed, and the passing rate of machining was investigated.
An amorphous metal strip was machined by the apparatus shown in FIG. The frequency of magnetostrictive vibration was set to 30 kHz. Alternating current was applied to the coils so that the maximum value of the alternating magnetic field generated by the coils was 30 A/m, 70 A/m, 100 A/m, and 130 A/m. In this case, the amorphous metal ribbon undergoes magnetostrictive vibration at magnetostrictions of 12 ppm, 16 ppm, 18 ppm and 19.8 ppm.
Other than that, the pass rate was examined under the same conditions as in the first embodiment.
In this range of alternating magnetic field strength, the No. 1 machined amorphous metal ribbon was magnetostrictively vibrated. In the embodiment of No. 1-4 in Table 1, the acceptance rate on the outer peripheral side is 60% or more, and the acceptance rate on the inner peripheral side is 70% or more. The pass rate was improved in all the embodiments as compared with the pass rate of the No. 8 comparative example.
In this range of alternating magnetic field strength, there was a tendency that the higher the magnetic field strength, the higher the acceptance rate of machining.

(Example 3)
An amorphous metal strip was machined by the apparatus shown in FIG.
The same bobbin 5 as in the first embodiment was used. The slit amorphous metal ribbon 1 was wound four times around the bobbin in the circumferential direction.
An alternating current of 30 kHz is sent from the alternating current power supply 3 to the amplifier 4, the current is amplified by the amplifier 4, and the alternating current is supplied to the coil 2 so that the maximum value of the alternating magnetic field generated by the coil (14 turns) is 180 A / m. flushed. In this case, the amorphous metal ribbon undergoes magnetostrictive vibration at a magnetostriction of 24 ppm.
Other than that, the acceptance rate of machining was examined under the same conditions as in the first embodiment.
As a result, all four layers could be cut without causing cracks or cracks.
In addition, for comparison, the acceptance rate of machining was examined in a state in which an alternating current was not applied to the coil 2 and magnetostrictive vibration was not applied. , Cracks or fissures were found over a wide area in all four layers. The pass rate was 90% when an alternating magnetic field was generated, and 0% when no magnetic field was generated.

In Examples 1-3, the FeSiB-based amorphous metal ribbon having soft magnetism was used. If there is, the same level of saturation magnetostriction can be obtained, and similar effects can be expected by applying the present invention.

In Example 1-3, the amorphous metal ribbon is machined to have a slit shape. It is also possible to form a strip and laminate it.

(Example 4)
In Example 4, the method for processing the amorphous metal ribbon of the above-described embodiment (vibration was locally applied to the amorphous metal ribbon by a processing tool, and the portion subjected to repeated fatigue due to the vibration was Machining method) to obtain a machined amorphous metal ribbon.
An amorphous metal ribbon was produced by roll cooling with an alloy composition of Fe _81.5 Si ₄ B _14.5 at atomic %. An amorphous metal ribbon having a thickness of 22.7 μm was prepared. The thickness of the strip was calculated from the density, weight and dimensions (length x width). Moreover, the width of the ribbon was 80 mm.
As a punching device, the one shown in FIG. 3 was used.
As a punching die, a cemented carbide material (Fujiroy VF-12 material manufactured by Fuji Die Co., Ltd.) was used for both the punchers 8a and 8b and the punch frames 9a and 9b. The punch has a columnar shape with a rectangular tip, the dimensions of which are 5×15 mm, and the corners are rounded (R portion 0.3 mm). The die has a working hole into which a punch is inserted. The punchers 8a and 8b and the punch frames 9a and 9b hold the amorphous metal strip 1, respectively, and the punchers 8a and 8b vibrate in the thickness direction. The vibration of the punchers 8a and 8b was ultrasonic vibration by an ultrasonic generator. The punchers 8a and 8b and the punch frames 9a and 9 are slidable in the thickness direction of the amorphous metal ribbon.
A sheet of amorphous metal strip was sandwiched between punch frames 9a and 9b and punchers 8a and 8b. In this state, the punchers 8a and 8b were ultrasonically vibrated, and the amorphous metal ribbon was repeatedly fatigued by the vibration at the sliding portion between the punch frame and the puncher. After that, while the punchers 8a and 8b were ultrasonically vibrated, the punchers 8a and 8b were operated under the condition of a load of 1400 N to perform punching. An amorphous metal ribbon having a side portion machined was obtained by a processing method in which the amorphous metal ribbon was machined while being vibrated.

15 is a photograph of the processed surface (side surface) of the amorphous metal ribbon obtained in Example 4. FIG. Magnification is 500 times. 16 is a schematic diagram of FIG. 15. FIG. In the figure, a sheared surface having oblique machining traces can be confirmed in the central portion of the ribbon in the thickness direction.
In this amorphous metal ribbon, the fracture surface occupied 73.4% of the machined surface (side surface) of the ribbon.

For comparison, a machined amorphous metal ribbon was obtained in the same manner as in Example 4, except that the punchers 8a and 8b were not vibrated.
FIG. 17 is a photograph of the processed surface (side surface) of the obtained amorphous metal ribbon. 18 is a schematic diagram of FIG. 17. FIG. As is generally said, a punched cross section has a sagging surface A (shaded area), a sheared surface B (vertical line area), a broken surface C (white area), and a burr D (gray area). .
However, unlike the amorphous metal ribbon of this embodiment, the ribbon surface on the sagging surface side had a flat contour and was not corrugated. In addition, the proportion of fractured surfaces in the processed surface is less than 70% (46.2%), which is very small. In addition, in the processed surface, the proportion of the sheared surface was 48.0%.

In Example 4, the FeSiB-based amorphous metal ribbon having soft magnetism was used. A similar effect can be expected.
Further, in the above-described embodiment, after the amorphous metal ribbon is repeatedly fatigued by vibration, punching is performed by stopping the ultrasonic vibration of the punchers 8a and 8b, that is, after vibrating the amorphous metal ribbon. A processing method of machining can also be applied.

1: Amorphous metal ribbon, 2: Coil, 3: AC power supply, 4: Amplifier, 5: Bobbin, 6: Processing tool, 7: Unwinding roll, 8: Puncher, 9: Punch frame, 10: Crack, 11: crack, 12: cut trace, A: sagging surface, B: sheared surface, C: fractured surface, D: burr surface

Claims (1)

An amorphous metal ribbon having a sheared surface formed by machining on the processed surface of the ribbon,
An amorphous metal ribbon in which a fractured surface occupies 50% or more of an area of a machined surface of the ribbon.

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