JP2020059043A - Method for producing amorphous alloy pieces - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the tool life by a method of punching an amorphous alloy piece from an amorphous alloy ribbon, which is another method which does not depend only on the tool coating. A manufacturing method is provided.
SOLUTION: A plastic working groove which becomes a punching contour line of a predetermined shape is formed on a surface of an amorphous metal ribbon, and the amorphous alloy piece of the predetermined shape is punched by a punch and a die for punching. A method for producing a featured amorphous alloy piece.
[Selection diagram] 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 exhibit excellent 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 is a soft magnetic material having a small coercive force because no grain boundary is formed.
The amorphous alloy can be prepared by rapidly solidifying the molten alloy, for example, by supplying the molten alloy to the surface of a rotating cooling roll and continuously solidifying the molten alloy on the roll surface. . This is a manufacturing method called a single roll method, and is a manufacturing method capable of manufacturing an amorphous alloy into a ribbon shape.
The ribbon-shaped amorphous alloy can be wound into a magnetic core, for example.

Further, when an attempt is made to form a motor stator core or rotor core from an amorphous alloy ribbon, these magnetic cores cannot be formed by winding because of their complicated shape. Therefore, it is known that an amorphous alloy ribbon is punched into a predetermined shape to form an amorphous alloy piece, and the amorphous alloy piece is laminated to form a magnetic core (for example, Patent Document 1).

Further, when punching the amorphous alloy ribbon, since the amorphous alloy ribbon is hard and has poor workability, continuous working causes rapid wear of the tool, that is, the punch and the die, and as a result, It is known that tool life is shortened. As a method of improving this, a method of coating these tool surfaces to prevent wear of the tool surfaces is known (for example, Patent Document 2).

JP, 2003-219613, A JP-A-60-227931

  Although the tool coating as disclosed in Patent Document 2 is effective for improving the tool life, the improvement is insufficient for continuously punching the amorphous alloy ribbon. Therefore, there is a need for another way to improve tool life that does not rely solely on tool coating.

  Therefore, the present invention provides a method of manufacturing an amorphous alloy piece obtained by punching an amorphous alloy piece from an amorphous alloy ribbon, which is capable of improving the tool life.

  The method for producing an amorphous alloy piece according to the present invention comprises forming a plastically machined groove on a surface of an amorphous metal ribbon, which serves as a punching contour line of a predetermined shape, and using a punch and a die for punching, the amorphous shape of the predetermined shape. This is a method for producing an amorphous alloy piece by punching into a fine alloy piece.

  According to the present invention, it is possible to improve the tool life in a method for manufacturing an amorphous alloy piece, which is obtained by punching an amorphous alloy piece from an amorphous alloy ribbon.

In this embodiment, it is a cross-sectional conceptual diagram of a jig 1 used for punching an amorphous alloy piece from an amorphous alloy ribbon. In the present embodiment, it is a conceptual cross-sectional view of a marking jig 21 used for forming a plastic working groove on the surface of an amorphous alloy ribbon. 7 is a graph showing the relationship between groove depth and pressing load when grooves are formed using the marking jig 21 in the present embodiment. 5 is a graph showing the relationship between the pressing load on the marking jig 21 and the punching load when punching using the jig 1 in the present embodiment. In this embodiment, it is a photograph of the end face of the amorphous alloy piece after punching.

Generally, in the punching process, the clearance between the die and the punch 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 deviates from the proper range.
Therefore, in order to perform punching while maintaining the tool life, it is necessary to confirm an appropriate clearance range in advance, and then perform processing with strict control 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.

Therefore, the present inventors have examined a punching method that can maintain the tool life without strict clearance management.
As a result, they have found that it is effective to form a plastically worked groove on the surface of the amorphous alloy ribbon in advance, and have reached the present invention.

  In the present invention, a plastic working groove is formed on the surface of the amorphous metal ribbon as a punching contour line having a predetermined shape, and the amorphous alloy piece is punched by a punch and a die for punching. By forming the plastically machined groove as the punching contour line, the amorphous alloy piece can be punched with a small punching load, and the tool life can be improved. The details will be described below.

In the initial examination, the present inventors formed a groove on the surface of the amorphous alloy ribbon to be the punching contour line of the amorphous alloy piece, and concentrated the deformation stress on the formed groove with the punch and die for punching. I worked on the hypothesis that if this is done, it would be possible to punch into a good shape.
Specifically, the amorphous alloy ribbon sample processed into a disk shape of φ16 mm was laser-ablated to form a groove of a punching contour line so as to draw a circle of φ9.3 mm. A punching process was performed using the jig 1 shown in FIG.

  The jig 1 includes 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 the amorphous material is provided between the die 4 and the work retainer 5. The quality alloy ribbon sample S1 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 S1 is pressed so that they can be closely fixed by the connecting rod 9. As a result, the amorphous alloy ribbon sample S1 is strongly sandwiched between the die 4 and the work retainer 5.

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

Further, the guide ring 6 has the same inner diameter as the amorphous alloy ribbon sample S1, and is arranged so that the through holes of the die 4 and the work retainer 5 have the same axis. As a result, the center of the amorphous alloy ribbon sample S1 coincides with the axes of the through holes of the die 4 and the work retainer 5, and the circle of φ9.3 mm formed by the groove serving as the punching contour line and the work retainer 5 are formed. The positioning with the through hole is made possible.

  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 S1 is The reverse side 7 and the tip surface of the punch 8 can be brought into contact with both surfaces. Then, when the tip surface of the punch 8 is positioned so that the inside of the circle formed by the groove serving as the punching contour line can be pressed and good punching processing can be performed, an amorphous alloy piece of φ9.3 mm is punched. Can be pulled out.

  In addition, the jig 1 on which the amorphous alloy ribbon sample S1 is set, the reverse pressing 7 and the punch 8 are inserted, and then the reverse pressing 7 and the punch 8 are clamped from the outside, so that both surfaces of the amorphous alloy ribbon sample S1 are In addition, the reverse pressing 7 and the tip surface of the punch 8 are strongly contacted. Then, a punching process was attempted by applying a load to the punch 8 while supporting the lower plate 2 with a pressing device (not shown).

  Here, 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 9.4 mm, and the reverse pressing 7 and the punch 8 were set to the outer diameter of 9.2 mm. That is, a clearance of 100 μm was formed on one side between the die 4 and the punch 8.

In this embodiment, the amorphous alloy ribbon sample S1 having an average thickness of 24.8 μm was used.
Since the jig 1 has a remarkably wide clearance with respect to the thickness of the amorphous alloy ribbon sample S1, it is expected that the influence of abrasion will be small and the tool life will be improved, but that it cannot be punched with a good shape. It was

  In the initial examination, a laser ablation process was used to form a groove having an average of 4 μm on the surface of the amorphous alloy ribbon sample S1 and the punching process was performed. However, the punching load varied widely from 25 kg to 75 kg in the case of 10 samples, with an average of 72 kg when the groove was not formed, and it was confirmed that there was almost no expected effect.

  From the results of the above initial examination, it was also considered to form a deeper groove by laser ablation processing, but there is a problem of foreign matter adhesion due to increased laser processing time and spatter generation, and amorphous alloy pieces of good shape We considered it unlikely to be obtained, and stopped further investigation.

  Next, the present inventors examined forming a plastically machined groove by the marking jig 21 shown in FIG. 2 instead of the laser ablation process.

  The marking jig 21 of FIG. 2 has a marking punch 22 and an anvil 23. After the amorphous alloy ribbon sample S1 is placed at the tip of the anvil 23, φ9 is formed on the surface of the amorphous alloy ribbon sample S1. The tip of the stamp punch 22 having a circular shape of 0.3 mm can be pressed with a predetermined load.

  When pressing was performed on the surface of the amorphous alloy ribbon sample S1 using the marking jig 21, it was confirmed that a plastically processed groove to be a punching contour line was formed.

  As shown in FIG. 3, the groove depth with respect to the pressing load changed substantially linearly, and the average depth was 11.3 μm per 1 ton of the pressing load.

Next, with respect to the amorphous alloy ribbon sample S1 in which the plastically processed groove serving as the punching contour line was formed, punching processing was performed using the jig 1 described above, and the relationship between the pressing load and the punching load was confirmed.
Here, when the pressing load is 0 ton, it is assumed that the sample is punched without forming the groove.

As a result, as shown in FIG. 4, it was found that the punching load could be greatly reduced even when the pressing load forming the plastic working groove was 1 ton. Unlike the groove formation by laser ablation processing, the free volume is reduced by pressurization and a short range of crystal structure (cluster) is formed, and the shear fracture mechanism is added from plastic deformation, and it is possible to easily punch even with weaker force. It is speculated that

FIG. 5 shows an end surface of a sample in which a groove is formed with a pressing load of 1 ton after punching.
The thickness portion just below the groove shows the tensile fracture surface often seen in amorphous alloys.

From the above, it has been found that the load on the tool can be reduced by previously forming the plastically machined groove to be the punching contour line on the surface of the amorphous alloy ribbon, so that the tool life 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.

  In the above embodiment, the marking jig 21 is used, but if the die-cut roll is used to continuously form the plastically machined groove, the number of working steps can be expected to be reduced.

INDUSTRIAL APPLICABILITY The present invention is applicable not only to a product that maintains an amorphous structure but also to an amorphous alloy ribbon for a nanocrystalline alloy that is punched as an amorphous alloy ribbon and then nanocrystallized. It is possible.

1 jig 2 lower plate 3 upper plate 4 die 5 work clamp 6 guide ring 7 reverse pressing 8 punch 9 connecting rod 21 marking jig 22 marking punch 23 anvil

Claims (1)

A plastic working groove that forms a punching contour line of a predetermined shape is formed on the surface of the amorphous metal ribbon, and the amorphous alloy piece of the predetermined shape is punched by a punch and a die for punching. A method for producing a crystalline alloy piece.