JP2020082116A - Manufacturing method of amorphous alloy piece - Google Patents

Abstract

To provide a manufacturing method of an amorphous alloy piece easy to handle while elongating a life of a tool used for stamping when stamping the amorphous alloy piece with a prescribed shape from an amorphous alloy ribbon.SOLUTION: A manufacturing method of an amorphous alloy piece according to the invention includes the steps of: forming a linear embrittled part serving as a stamping contour line with a prescribed shape on an amorphous alloy ribbon surface; and stamping on the amorphous alloy piece with the prescribed shape by a punch for stamping and a die for stamping.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for manufacturing an amorphous alloy piece, which comprises punching an amorphous alloy ribbon into an amorphous alloy piece having a predetermined shape.

Amorphous alloys are known to show excellent properties in mechanical properties, magnetic properties, corrosion resistance, etc. even if they have the same composition as a normal crystalline alloy. In particular, it is known that an Fe-based or Co-based amorphous alloy can be used as a soft magnetic material having a small coercive force because no crystal grain boundary is formed.
Amorphous alloy, it is necessary to rapidly solidify the molten alloy, so that crystal grains are not formed in the alloy, for example, the molten alloy is supplied to the surface of a rotating cooling roll, and the molten alloy is continuously applied on the roll surface. It is made by solidifying. This manufacturing method is called a single roll method, and a ribbon-shaped amorphous alloy is obtained. Further, as a magnetic core formed of a ribbon-shaped amorphous alloy, it is known that a toroidal core formed by winding an amorphous alloy can be easily manufactured.

Amorphous alloys are expected to be applied to and expanded in stator cores and rotor cores of motors, but since these cores have complicated shapes, it was difficult to form them with toroidal cores. Therefore, a method of punching an amorphous alloy ribbon into a predetermined shape to form an amorphous alloy piece and stacking the amorphous alloy pieces to form a core is applied (for example, Patent Document 1).
However, it is known that when an amorphous alloy ribbon is punched into a predetermined shape by a normal punching device, the amorphous alloy ribbon is a difficult-to-machine material, and the tool life of punches and dies is shortened. Was there. On the other hand, a method has been proposed in which an amorphous alloy ribbon is subjected to heat treatment to relax the structure of the alloy itself, reduce the stickiness of the material, and make the material moderately brittle to improve workability ( For example, Patent Document 2). According to this method, the friction between the tool and the ribbon can be reduced, and the tool life can be extended.

JP, 2003-219613, A JP, 2002-053939, A

The method described in Patent Document 2 can be expected to improve the workability of the amorphous alloy ribbon and extend the tool life. However, the present inventor has recognized the problem that this method makes the entire amorphous alloy ribbon brittle and difficult to handle.

Therefore, the present invention provides a method for manufacturing an amorphous alloy piece that is easy to handle while prolonging the tool life when punching an amorphous alloy piece having a predetermined shape from an amorphous alloy ribbon.

A method for producing an amorphous alloy piece according to the present invention comprises forming a linear embrittlement portion on a surface of an amorphous alloy ribbon, which becomes a punching contour line of a predetermined shape, and punching the punched die and die with the predetermined shape. Is a method for producing an amorphous alloy piece by punching.

Further, in the present invention, it is preferable that the embrittlement portion is formed by disposing a heat absorption layer at the contour line position on the surface of the amorphous alloy ribbon and heating the heat absorption layer.

Further, in the present invention, it is preferable to use a paint that absorbs heat rays in the heat absorption layer.

According to the present invention, since the amorphous alloy ribbon having a high toughness as a whole can be punched, the tool life can be extended and the handling property can be improved. Therefore, it is extremely useful for manufacturing amorphous alloy pieces for complicated shapes such as a stator core and a rotor core of a motor.

In this example, it is a diagram showing an outline of a punching apparatus 1 used for punching an amorphous alloy piece from an amorphous alloy ribbon. In this example, it is a photograph of an end face of the amorphous alloy piece on which the embrittlement portion has been formed after punching.

As described above, one of the important features of the present invention is that not the entire amorphous alloy ribbon but the linear embrittlement portion which is a punched contour line of a predetermined shape is formed on the surface of the amorphous alloy ribbon. is there.
With this configuration, the shearing force of the punching tool can be applied to the embrittlement portion, and the punching process can be performed with a low punching load. This is one action that can extend the tool life in the present invention.

In addition, since the amorphous alloy ribbon having high toughness remains as a whole except for the embrittlement portion, deterioration of the hand linking property can be suppressed.
Further, even if a crack is generated in the embrittled portion during the punching process, the crack growth can be stopped within the range of the embrittled portion, and the occurrence of defects can be suppressed.

Further, generally, in the punching process, the clearance between the punch and the die, that is, the so-called one-side clearance has an appropriate range suitable for the material, and is about 3% to 20% of the plate thickness. And, it is known that the tool life is shortened when it goes out of the proper range. Therefore, in order to carry out punching while maintaining the tool life, it is necessary to confirm an appropriate clearance range in advance, and then perform processing while strictly controlling so that the processing will be performed within the appropriate range. There wasn't.
Since the above-mentioned amorphous alloy usually has a thickness of about 5 to 50 μm, the appropriate clearance range is extremely narrow and it is quite difficult to adjust the clearance.

According to the study of the present inventor, by forming a linear embrittlement portion to be a punched contour line of a predetermined shape, a clearance wider than conventional, specifically, a clearance wider than the plate thickness, It was confirmed that normal punching could be performed.
As a result, it is possible to suppress galling of the punching tool, which is one of the factors that shorten the tool life. This is another action that can extend the tool life in the present invention.
It should be noted that if the clearance is too wide, the shape deteriorates, so it is desirable to keep the clearance to about 500% of the plate thickness.

In the present invention, as the width of the embrittlement portion described above, it is effective to make it easy to form and not to significantly reduce the toughness of the entire amorphous alloy ribbon, and to set a width limited to stop the progress of cracks. Is. It is preferably 1 mm or less.

The form of the embrittled portion is not limited, but when a pulse laser is used, a groove may be formed by evaporation or bumping. In connection with this, spatter etc. may adhere to the surface. Foreign matter such as spatter adhered to the surface may lead to deterioration of interlayer insulation when stacked and used, and therefore should be avoided. In the present invention, the embrittlement portion is preferably formed only by the modification of the tissue by heating using a continuous wave laser or the like.
Note that embrittlement due to crystallization or embrittlement due to structural relaxation can be applied to the embrittlement portion.

For forming the embrittled portion by heating, heating by irradiation with laser or infrared rays as a heat source, stamp-type contact heating by pressing a heated mold, or the like can be used.

A fiber laser, a carbon dioxide gas laser, a YAG laser, a diode laser, or the like can be applied as the laser used.
In the case of a focused high-energy beam such as a laser, a method of scanning and heating the embrittlement target portion with a galvano scanner or the like can be applied.

Since the subject of the present invention for punching is an amorphous alloy ribbon, heating by irradiation causes a large energy loss due to reflection. Moreover, since the thermal conductivity is high even in the contact heating, it may be difficult to obtain the predetermined heating as it is.
Therefore, it is preferable to dispose the embrittlement portion at the contour line position on the surface of the amorphous alloy ribbon and heat the heat absorption layer.

By installing a heat absorption layer, the heat absorption layer is supported by irradiation of the amorphous alloy ribbon in the width direction using a cylindrical lens or wide area irradiation of an infrared lamp, for example, rather than partial heating by precise scanning of a laser. It is possible to heat the punched contour line position of a predetermined shape. According to these methods, it is possible to fix the irradiation position and perform heating while conveying the amorphous alloy ribbon.

The heat absorption layer preferably has a property of easily absorbing the heat of the heating means or a property of hardly transmitting the heat, as compared with the amorphous alloy ribbon. The simplest way to form a heat absorption layer is to apply a paint that absorbs heat rays. Here, the heat ray may be one that gives heat energy. For example, infrared rays and laser beams can be used.

A brush may be applied as a method for applying the paint, but a method in which a pattern mask is arranged on the surface of the amorphous alloy ribbon and spray application is effective.
Further, if the coating method is applied, it is possible to apply the coating material uniformly in a short time, so that it is expected that the number of working steps can be reduced.

As the paint, for example, an alcohol-based oil-based dye ink is preferable because it can suppress bleeding at the time of application. A paint containing carbon black as a pigment may be used to increase the heat absorption rate.

Hereinafter, other features of the present invention will be described.
The present invention is intended for punching amorphous alloy ribbons. Although the composition and dimensions are not particularly limited, an alloy having a composition represented by (Fe1-aMa)bSicBd (atomic %) can be applied as long as it is an Fe-based amorphous alloy. Here, M is Co and/or Ni, and a, b, c and d satisfy 0≦a≦0.3, 76≦b≦84, 1≦c≦12 and 8≦d≦18, respectively. Further, a part of Fe can be replaced with an element such as C, P, S or Ga in a range of 3 atomic% or less. Further, a part of Fe may be replaced with an element such as Nb, W, Ta, Hf, Ti, V, Cr and Mn in a range of 10 atomic% or less.

Further, in terms of handling an amorphous alloy ribbon, it can also be applied to an amorphous alloy ribbon that is subjected to nanocrystallization treatment after processing. Amorphous ribbons that apply a nanocrystallization process typically
An alloy having a composition represented by (Fe1-aMa)100-xyz-α-β-γCuxSiyBzM'αM"βXγ (atomic %) can be applied, where M is Co and/or Ni and 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 Al, platinum group element, Sc, rare earth element, Au, Zn, At least one element selected from the group consisting of Sn and Re, X is at least one element selected from the group consisting of C, Ge, P, Ga, Sb, In, Be and As. Further, a, x, y, z, α, β and γ are 0≦a≦0.5, 0.1≦x≦3, 0≦y≦30, 0≦z≦25, 5≦y+z≦, respectively. 30, 0≦α≦20, 0≦β≦20 and 0≦γ≦20 are satisfied.

The wider the width of the amorphous alloy ribbon is, the larger the core for the motor can be made, which is preferable.
The thickness of the amorphous alloy ribbon is preferably 5 μm or more and 50 μm or less. When the thickness is less than 5 μm, the mechanical strength of the soft magnetic alloy ribbon tends to be insufficient. The thickness is more preferably 10 μm or more, further preferably 15 μm or more. On the other hand, if the thickness of the soft magnetic alloy ribbon exceeds 50 μm, it tends to be difficult to stably obtain an amorphous phase when it is manufactured by roll cooling. The thickness is more preferably 35 μm or less, and further preferably 30 μm or less.

The punching punch and die used in the present invention are also not particularly limited. Tools made of cold die steel or cemented carbide can be used. It is also possible to use a combination of nitriding treatment for increasing hardness and various kinds of coating.

Examples will be described below.
First, an amorphous alloy ribbon of Metglas 2605HB1M (composition: Fe—Si—B) manufactured by Hitachi Metals, Ltd. having a width of 60 mm and a thickness of 24.8 μm formed by the single roll method was prepared.
The above-mentioned "Metglas" is a registered trademark of Metglas Incorporated, which is a group company of Hitachi Metals, Ltd.

Next, black paint was applied to the surface of the amorphous alloy ribbon so as to draw a circular shape that would be a punched contour line. Specifically, a pattern mask in which a hole of a circular pattern to be a punching contour line is opened is pressed against a fixed amorphous alloy ribbon, and a black marker pen is used to paint on the above-mentioned pattern mask, A circle having a diameter of φ9.3 mm was drawn as a punching contour line. The line width of the drawn contour line in the drawn circle was 0.2 mm.
The black ink used is an alcohol-based oil dye.

Next, a laser beam light of a fiber laser having a wavelength of 1064 nm was irradiated to the drawn circular pattern which became the punching contour line to form an embrittlement portion.
Irradiation was performed while the defocus of the laser beam light was 10 mm and the laser beam light was scanned by a galvano scanner. The scanning with the galvano scanner was performed by sequentially scanning the amorphous alloy ribbon in the width direction, the scanning distance was 60 mm, which is the width of the amorphous alloy ribbon, and the scanning speed was 2000 m/s.
The width of the laser beam was 2.2 mm, which was about 10 times larger than the width of the paint.

The width of the heat-affected zone, which is the embrittlement zone, due to the irradiation of the laser beam was about 0.25 mm.
On the other hand, no groove formed by evaporation or bumping was observed in the drawn circular pattern which is the punched contour line.

Amorphous alloy ribbon sample S was obtained by cutting the above amorphous alloy ribbon by laser cutting into a disk shape of φ16 mm concentric with the punched contour line of φ9.3 mm.

Next, in order to evaluate the punching property of the present invention, the output of the laser beam was changed, an amorphous alloy ribbon sample S was produced, and the punching load was confirmed. Specifically, the amorphous alloy ribbon sample S was punched by the punching device 1 shown in FIG.

The punching device 1 in FIG. 1 is provided with a lower plate 2, an upper plate 3, a die 4, a work retainer 5, a guide ring 6, a reverse push 7, a punch 8 and a connecting rod 9, and between the die 4 and the work retainer 5. , Sample S can be arranged.

Further, the lower plate 2 and the upper plate 3 are respectively arranged on the side opposite to the side on which the amorphous alloy ribbon sample S is pressed so that they can be fixed closer to each other by the connecting rod 9. As a result, the sample S is strongly sandwiched between the die 4 and the work retainer 5.

In the punching device 1, the lower plate 2, the upper plate 3, the die 4, and the work retainer 5 each have a through hole, and these are arranged in the punching device 1 so that the axes of the through holes are aligned. ..

The guide ring 6 has the same inner diameter as the amorphous alloy ribbon sample S, and is arranged so that the shaft is the same as the through hole of the die 4 and the work retainer 5. As a result, the center of the amorphous alloy ribbon sample S coincides with the axes of the through holes of the die 4 and the work retainer 5, and the circle of φ9.3 mm serving as the punching contour line and the through hole of the work retainer 5 are positioned. I am able to

In addition, through the through holes of the lower plate 2, the upper plate 3, the die 4, and the work retainer 5, the reverse pressing 7 is inserted from the lower plate 2 side, and the punch 8 is inserted from the upper plate 3 side, and the amorphous alloy ribbon sample S The reverse surface 7 and the tip surface of the punch 8 can be brought into contact with both surfaces.

In the punching device 1 in which the amorphous alloy ribbon sample S is set, the reverse push 7 and the punch 8 are inserted, and then the reverse push 7 and the punch 8 are clamped from the outside, so that both sides of the amorphous alloy ribbon sample S are The reverse pressing 7 and the tip surface of the punch 8 were strongly contacted. Then, a punching process was performed by applying a load to the punch 8 while supporting the lower plate 2 by a press device (not shown).

Here, in the punching device 1, the inner diameters of the through holes of the lower plate 2, the upper plate 3, the die 4, and the work retainer 5 were set to 9.3 mm, and the reverse pressing 7 and the punch 8 were set to an outer diameter of 9.2 mm. That is, a clearance of 50 μm on one side was formed between the die 4 and the punch 8.
In this example, the die 4 and the punch 8 made of JIS-SKD11 were used.

Since the clearance value applied in this example is remarkably wider than the thickness of the amorphous alloy ribbon sample S, the tool life is expected to be improved while the influence of wear is reduced, while the usual clearance value is expected. It is a value that punching cannot be performed with good shape by punching.

Table 1 shows the results of punching in this example.
It was found that the punching load could be greatly reduced in the amorphous alloy ribbon samples S1 and S2 of the present invention in which the brittle portion was formed.
It is presumed that this is because the linear embrittlement portion that forms the punching contour line locally crystallizes or structurally relaxes and promotes crack propagation during shearing.
In Table 1, the result of performing the same punching process on the amorphous alloy piece ribbon sample S in which the embrittlement portion is not formed is additionally indicated as S0.

FIG. 2 shows a processed surface of the end faces of the amorphous alloy piece ribbon samples S1 and S2 in which the embrittlement portion is formed, observed by an optical microscope.
The amorphous alloy piece ribbon sample S1 has a smooth sheared surface, and it can be seen that the punched surface is normal.
It should be noted that the amorphous alloy piece ribbon sample S2 has a result that a fractured surface having irregularities is seen in addition to the sheared surface. Therefore, when importance is attached to the shape, it is presumed that it is preferable not to raise the laser output too much.

From the above, it was found that the load on the tool can be reduced by previously forming a linear embrittlement portion on the surface of the amorphous alloy ribbon, which becomes the punching contour line, so that the tool life can be improved. Further, according to the present invention, since the amorphous alloy ribbon as a whole can be punched, the handling property can be improved. Further, since punching can be performed with a clearance larger than usual, reduction in man-hours required for tool adjustment can be expected.

1 Punching device 2 Lower plate 3 Upper plate 4 Die 5 Work clamp 6 Guide ring 7 Reverse push 8 Punch 9 Connecting rod

Claims (3)

A linear embrittlement portion that forms a punched contour line of a predetermined shape is formed on the surface of the amorphous alloy ribbon, and the amorphous alloy piece of the predetermined shape is punched by a punch and a die for punching. And a method for producing an amorphous alloy piece. The embrittlement portion is formed by disposing a heat absorbing layer at the position of the punched contour line on the surface of the amorphous alloy ribbon and heating the heat absorbing layer. Method for producing amorphous alloy pieces. The method for producing an amorphous alloy piece according to claim 2, wherein a paint that absorbs heat rays is used for the heat absorption layer.