JPS58224090A - Cutting method of magnetic steel strip - Google Patents

Abstract

PURPOSE:To eliminate the burrs in the stage of cutting and to improve the iron core characteristics of a rolled core, by irradiating laser beams of low energy to one surface of a magnetic steel strip to form grooves, and irradiating laser beams of high energy on the other surface. CONSTITUTION:When a magnetic steel strip 10 is delivered over lower laser beam nozzles 15a, 15b, beams 19a, 19b of low energy and a small diameter are irradiated to the strip, whereby grooves 20 are formed in the lower part of the cutting parts along the longitudinal direction of the strip 10. The strip 10 is fed to the part under upper laser beam nozzles 16a, 16b, where beams 21a, 21b of high energy and a small diameter are irradiated from the nozzles 16a, 16b to the strip 10 from the side opposite from the previously formed grooves 20, whereby the steel strip is cut and a magnetic steel strip 6 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for cutting a magnetic copper strip by cutting an uncut core using a laser beam, for example, to be used in a hydraulic device.

[Technical background of the invention]

Wound cores include cut cores, one-turn cut products, and uncut cores. Among these, uncut cores do not cut the magnetic steel strip, so the flow of magnetic flux is smooth and the core properties are excellent. A transformer using this uncut core is constructed by disposing a coil (n/'t) on a leg portion of a wound core in which a magnetic steel strip is continuously wound through a cylindrical spool. In this case, in order to increase the space factor within the cylindrical spool, the width of the magnetic steel strip in each winding layer is gradually adjusted from the inside to the middle so that the cross section of the leg portion is approximately circular. The magnetic steel strip that makes up the wound core therefore needs to be cut to have different widths along its length.

Conventionally, magnetic steel strips have been cut using a pair of cutters 8 and 9, as shown in FIGS. 1 and 2. That is, the cutter pieces 8a, 8b and 9a at the lower part of L are attached to the shaft 7 which is freely movable in the width direction of the wide magnetic steel strip 100.
, 9b are provided, and the distance between the cutters 8 and 9 is set to lin. Then, the magnetic steel strip 10 is pulled out from the hoop material of the magnetic steel strip IO attached to the uncoiler 11, and the pinch roller 12 a + i 2
By inserting magnetic steel @io between the cutter pieces 8a and 8b and the cutter piece 9b, each cutter 8 and 9 cuts the cutter to a prescribed width. The starting end of the cut 7I21.61i steel strip 6 is fixed to a rectangular winding form 13 attached to a winding shaft (not shown), and then the winding form 13 is rotated to roll the wide magnetic copper strip 10 into each cutter. 8 and 9, cut into widths and wind until a predetermined stacking thickness is achieved. Next, the cutters 8 and 9 are each moved so as to spread in the width direction of the wide magnetic copper strip 100, and the distance between the cutters 8 and 9 is set to Hn + a. This width Hn+a
The magnetic steel strip 6 is cut into a wide magnetic steel strip 101, and the magnetic steel strip 6 is wound around the winding die 13 until a predetermined thickness is obtained. At this time, magnetic steel strip 6
A change in the width of the axis 7 is instructed to each axis 7 by a device not shown. In this way, the wide magnetic steel strip 10 is wound around the winding form 13 while increasing its width step by step and cutting it, and when the width of the magnetic steel strip 6 reaches the maximum width Hmax, the predetermined stacking thickness is reached. The entire intermediate layer is formed by winding. Thereafter, the width of the magnetic steel strip 6 is sequentially narrowed by cutting the cutters 8 and 9 while decreasing the distance Mk71, and winding it around the winding form 13, so that the cross-sectional shape of the wound iron core becomes approximately circular. Turn.

[Problems with Background Art] As described in 1 below, in the conventional cutting method, the pair of cutters 8 and 9 are all used to sequentially cut and wind the wide magnetic steel strip 10. However, each cutter piece 8a, 8 of cutter 8, 9
Since there is a clearance J between b, 9a and 9b as shown in Fig. 2, the cut surface of the cut magnetic steel strip 6 has a burr 14 as shown in Fig. 3.The zero-turn iron core is magnetic. It is manufactured by winding the steel strip 6, applying a tension of 1.'' and tightly winding it. Therefore, since the magnetic steel strip 6 is in close contact with each other in each winding layer, a short circuit occurs between the layers due to the burrs 14, which increases eddy current loss and significantly deteriorates the core characteristics.

[Purpose of the invention]

The present invention improves the above-mentioned drawbacks, and aims to provide a method for cutting a magnetic steel strip that eliminates the occurrence of burrs when cutting the magnetic copper strip and improves the core characteristics of a 9-wound core. .

[Summary of the invention]

In the present invention, a low-energy laser beam is irradiated to the cut portion of the magnetic steel strip to form a groove on one surface of the magnetic copper strip, and then a groove is formed on the other surface of the magnetic steel strip along the groove. Since the magnetic steel strip is cut by irradiation with an energetic laser beam, there is no occurrence of burrs on the cut surface of the magnetic steel strip, and a method for cutting the magnetic steel strip that improves the core characteristics of the wound core can be obtained.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same reference numerals are used to describe the same parts as those in the prior art. 4 and 5 are diagrams showing the state of cutting a magnetic steel strip by the method of the present invention, in which a wide magnetic steel strip 10 attached to an uncoy 2-11 is shown.
A magnetic steel strip 10'ffi is drawn out from the 7-ply material, and this magnetic steel strip 1 (a rectangular winding form cut into a predetermined width by IMI and a second laser beam and attached to a winding shaft hill (not shown) 1
It is wound around 3L. The first laser beam is irradiated onto the lower surface of the magnetic steel shell 10 by laser beam nozzles 15a, 15t provided on the side of the coiler 11 between the uncoiler 11 and the winding form 13, and the second laser beam is winding form 1
The L-plane of the magnetic steel strip 10 is irradiated with laser beam nozzles 16a and 16b provided on the third side. The laser beam nozzles 15a and 15b are configured to move in parallel to the width direction below the magnetic steel strip IO by rotating the shaft 17.

The laser beams 19a, 1(H) from the laser beam nozzles 15a, 15b are for forming grooves in the cut portion of the magnetic steel strip 10, so the beam tip has a small diameter, and the laser beams 19a, 1(H) from the laser beam nozzles 15a, 15b have a small diameter. The energy is adjusted to be low so that 19b does not penetrate. On the other hand, the laser beam nozzles 16a and 16b are configured to move parallel to the width direction on either side of the magnetic steel strip 1O by rotating the shaft 18. The laser beams 21a and 21b produced by the laser beam nozzles 16a and 16b are used to completely cut the magnetic steel strip, so the beams are narrowed down using an optical lens (not shown) so that the tip of the beam has a small diameter and has commercial energy. It has been adjusted as follows. In the figure, 12a and 12b are pinch rollers that feed the magnetic steel strip 10.

Next, the cutting and winding method will be explained. Distance between F part laser beam nozzles 15a and 15b and J part laser beam waste n/16a and 16b, axis 17.18 ffi
Rotate and add each to Hn. Then, the magnetic steel strip 10 is fed to the lower laser beam nozzles 15a, 15b J= by the pinch rollers 12a, 12b in the direction of the arrow 22. Then, a beam 19a with a small diameter and a low energy
, 19b are irradiated, and a layer 20 is formed at the lower part of the cut along the length of the magnetic steel strip 10. This groove 20 has a depth of approximately A, which is the thickness of the magnetic steel strip lO. Next, groove 20t
The formed amphoteric copper band 10 is passed through a laser beam nozzle at the t section.
Send it to the bottom of 6a and 16b. Then, the magnetic steel strip 10 is melted and cut by irradiating high-energy, small-diameter beams 21a, 21b from the laser beam nozzles 16a, 16b from the opposite side of the previously formed '#/#20, The magnetic steel strip 10 is sequentially cut along its length to form a wide magnetic copper strip I6. Then, this starting end is identified as the winding form 13.

Thereafter, the winding form 131c is rotated, and the entire magnetic copper strip 10 is wound to a predetermined stacking thickness I while cutting the magnetic copper strip 10 to a width Hn using the beads A 19a, 19b and the beads A 21a, 21b as described above. Next, the distance between the lower laser beam nozzles /l/tsa and 15b and the distance between the L laser beam nozzles 16a and 16b are moved so that the width of the magnetic steel strip 6 increases to H'n + a. Then, while cutting the magnetic steel strip 6 at (n+a) (width) (n+a), cut the magnetic steel strip 6 in the specified direction.
□ Cut the copper strip 60 so that the width becomes wider, and the width becomes H.
When the thickness reaches the maximum, the intermediate layer is formed by winding the layer until it reaches a predetermined thickness. Thereafter, the width of the magnetic steel strip 6 is sequentially reduced and the magnetic steel strip 6 is wound while being cut so that the cross-sectional shape of the wound core 1 becomes approximately circular.

In this way, in the first step, the beams 19a and 19b are irradiated to the position where the magnetic steel strip 10 is to be cut to create a groove 20), and in the second step, the beams 21a and 21b are irradiated from the opposite side of the groove. Cut. For this reason, since the groove is first formed at the time of cutting, the cutting sagging does not occur on the groove side when cutting in the second step, and there is no cutting force error as in the conventional method. Furthermore, since the beams 21a and 21b are narrowed when cutting the insulation coating of the magnetic steel strip 6, the coating will not be burnt. A wound core in which these magnetic steel strips are wound has no cutting force error even if the magnetic steel strips are in close contact with each other, so there is no interlayer short circuit. Therefore, the occurrence of eddy current loss is prevented, the core characteristics are improved, and a highly reliable and stable product with small variations can be produced.

The same example described the cutting method for an uncut wound core, but the manufacturing method involves cutting one wide magnetic steel strip into magnetic steel strips of the same width and laminating them, such as stacked cores, 0-type cut cores, and one-turn cut cores. Similar effects can also be obtained by using the cutting method of the present invention.

[Effects of the Invention] As explained above, according to the present invention, the first and second laser beams are used to cut the magnetic steel strip, so the cut surface has a rounded shape. Therefore, it is possible to provide a method for cutting magnetic steel strips that can prevent interlayer short circuits between laminated magnetic steel strips and have improved core characteristics.

[Brief explanation of drawings]

Figure 1 is a conceptual diagram showing the conventional magnetic steel strip cutting process, Figure 2
The figure is a sectional view taken along the ff-n line in Fig. 1, Fig. 3 is a sectional view of a conventional uncut wound core, Fig. 4 is a conceptual diagram showing the process of cutting a magnetic steel strip according to the present invention, and Fig. 5 is a sectional view of the conventional uncut wound core. Figure 4 mV-
6 is a cross-sectional view of an uncut wound core manufactured by the method of the present invention. 6.10: Magnetic steel strip, 15a, 15b: J: Laser beam nozzle, 15
a, 16b: Lower laser beam nostle, 19a, 19
b, 21a, 21b: laser beam, 20: groove. (7317) Representative Patent Attorney Kensuke Chika (and 1 other person) Figure 1 4 Figure 3 Figure 4 Figure 6

Claims (1)

[Claims] A low-energy laser beam is applied to the cut section of the magnetic steel strip to form a groove on one surface of the magnetic steel strip, and then a high-energy, low-energy laser beam is applied to the other surface of the magnetic steel strip along this #. A method for cutting a magnetic steel strip characterized by cutting the magnetic steel strip by irradiating a beam.