Micro-magnetic domain processing method and micro-magnetic domain processing device

Abstract

To simplify a processing step and to reduce a cost in an electromagnetic steel sheet subjected to fine magnetic domain processing for reduction of iron loss.SOLUTION: A fine magnetic domain processing method according to the embodiment is a method for performing fine magnetic domain processing on a surface of an electromagnetic steel sheet. The method includes a grain arrangement step of arranging a large number of hard grains so as to cover a predetermined region on the surface of the electromagnetic steel sheet, and a pressing step of pressing the large number of grains on the electromagnetic steel sheet to form scratch marks by pressing the region where the grains are arranged on the electromagnetic steel sheet.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] An embodiment of the present invention relates to a fine magnetic domain machining method and a fine magnetic domain machining device for performing fine magnetic domain machining on a predetermined region of an electromagnetic steel sheet. [Background technology]

[0002] For the core of a static induction device, for example, a transformer, generally, an oriented electromagnetic steel sheet such as a silicon steel sheet is used. In this case, there is a so-called one-turn cut type wound core, which is configured by winding and stacking a plurality of strip-shaped electromagnetic steel sheets into a ring shape with at least one butt joint provided for each turn (see, for example, Patent Document 1). There is also known a laminated core, which is configured by stacking a plurality of electromagnetic steel sheets cut into a predetermined shape to form legs and yokes, and combining them. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-28406 A Summary of the Invention [Problem to be solved by the invention]

[0004] In an iron core constructed by laminating and joining electromagnetic steel sheets as described above, there is a problem that the magnetic resistance increases at the joints, resulting in loss, i.e., iron loss. In recent years, therefore, in order to reduce loss, it has been considered to perform fine magnetic domain processing on the surfaces of the electromagnetic steel sheets that constitute the iron core, which finely divides the magnetic domains. In this case, a simple method of performing fine magnetic domain processing on the surfaces of electromagnetic steel sheets is to make a large number of scratches on the surface using a press die that has a large number of needle-like minute protrusions on the surface.

[0005] However, with such a method, wear and chipping of the minute protrusions will occur, and relatively frequent re-polishing will be required to repair the press mold, which is expected to result in problems such as increased time and cost required for polishing and repair. Therefore, the present invention provides a fine magnetic domain processing method and a fine magnetic domain processing device that can simplify the processing steps and reduce costs in performing fine magnetic domain processing on electromagnetic steel sheets to reduce iron loss. [Means for solving the problem]

[0006] The fine magnetic domain processing method according to the embodiment is a method for performing fine magnetic domain processing on the surface of an electromagnetic steel sheet, and includes a particle arranging step of arranging a large number of hard particles so as to spread them out in a predetermined area on the surface of the electromagnetic steel sheet, and a pressurizing step of pressing the large number of particles against the electromagnetic steel sheet by applying pressure to the area of ​​the electromagnetic steel sheet in which the particles are arranged, thereby forming scratch marks.

[0007] The fine magnetic domain processing device of the embodiment is a device for performing fine magnetic domain processing on the surface of an electromagnetic steel sheet, and is equipped with a particle arrangement mechanism that arranges a large number of hard particles so as to spread them out in a predetermined area on the surface of the electromagnetic steel sheet, and a pressure mechanism that applies pressure to the area of ​​the electromagnetic steel sheet where the particles are arranged, and presses the large number of particles against the electromagnetic steel sheet to form scratch marks. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing a first embodiment, and is a schematic diagram showing an overall configuration of a wound core manufacturing apparatus. [Diagram 2] FIG. 1 is a perspective view showing a schematic configuration of a fine magnetic domain processing device and a cutting mechanism portion. [Diagram 3] FIG. 1 is a perspective view showing examples of some shapes of granules; [Figure 4] FIG. 13 is a perspective view showing a schematic configuration of a fine magnetic domain processing device and a cutting mechanism according to a second embodiment. [Diagram 5] FIG. 13 is a perspective view showing a schematic configuration of a fine magnetic domain processing device and a cutting mechanism according to a third embodiment. [Figure 6] 1 is a schematic front view showing an example of a laminated core; [Figure 7] FIG. 13 is a diagram showing a fourth embodiment, illustrating how the particles are held by the holding member. [Figure 8] FIG. 13 is a perspective view showing a schematic configuration of a fine magnetic domain processing device according to a fifth embodiment. [Figure 9] FIG. 13 is a perspective view showing a schematic configuration of a fine magnetic domain processing device according to a sixth embodiment. [Figure 10] FIG. 13 is a perspective view showing a seventh embodiment, and is a schematic diagram showing the configuration of a fine magnetic domain processing device portion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, several embodiments applied to the manufacture of wound cores and laminated cores for transformers as stationary induction devices will be described with reference to the drawings. Note that parts common to a number of embodiments are given the same reference numerals, and new illustrations and repeated explanations will be omitted.

[0010] (1) First embodiment First, a first embodiment applied to the manufacture of a wound core will be described with reference to Figures 1 to 3. First, a brief description of the wound core 1 will be given. As partially shown in an inclined state in Figure 1, this wound core 1 is configured in a rectangular ring shape with rounded corners, having two legs 2, 2 extending in the vertical direction and yoke parts 3, 3 connecting the upper ends of the legs 2, 2 to the left and right and connecting the lower ends of the legs 2, 2 to the left and right. A winding (not shown) is attached to each of the legs 2, 2 to form a transformer.

[0011] This wound core 1 is a so-called one-turn cut type. That is, the wound core 1 is constructed by cutting a hoop material of a strip-shaped electromagnetic steel sheet 5 such as a silicon steel sheet to the required dimensions for each turn to form one unit of electromagnetic steel sheet 5, and winding and stacking a plurality of these electromagnetic steel sheets 5 in the inner and outer circumferential directions while providing a joint 6 where the ends of the sheets are butted together. A grain-oriented electromagnetic steel sheet is used for the electromagnetic steel sheet 5, and the longitudinal direction, i.e., the winding direction, is the rolling direction. The joint 6 is configured to be located at approximately the center of the lower yoke part 3. At this time, the joint 6 for each turn is configured to be stacked while being shifted at a constant pitch in a stepped manner in the winding and stacking direction, i.e., the radial direction, of the electromagnetic steel sheet 5. The joints 6 are arranged from the inner circumferential side to the outer circumferential side, shifting in order to the left in the figure, so that several sheets of the electromagnetic steel sheet 5 are repeated as one block in the winding and stacking direction.

[0012] At this time, in this embodiment, as shown in Fig. 2, a fine magnetic domain processing section 7 is provided in which a large number of scratches are formed at the portion of the surface of the tip of each of the electromagnetic steel sheets 5 that overlaps with the joint 6 of another electromagnetic steel sheet 5, and which has been subjected to fine magnetic domain processing. As shown by mesh lines in Fig. 2 for convenience, the fine magnetic domain processing section 7 is provided in a certain range, for example, a predetermined region having a length dimension approximately twice the pitch of the misalignment of the joint 6, across the entire width of the electromagnetic steel sheet 5. This predetermined region is defined as a range on the surface of the end of the electromagnetic steel sheet 5 through which magnetic flux passes to another overlapping electromagnetic steel sheet 5.

[0013] 1 shows a schematic diagram of the overall configuration of a manufacturing apparatus 11 for manufacturing the above-mentioned wound core 1. This manufacturing apparatus 11 mainly comprises a transport mechanism 13 that transports a hoop material 12 of a long wound electromagnetic steel sheet 5 while pulling it out, a fine magnetic domain processing device 14 according to this embodiment that performs fine magnetic domain processing on the portion that will become the cut end of the electromagnetic steel sheet 5, a cutting mechanism 15 that cuts the electromagnetic steel sheet 5 to a predetermined size, and a winding mechanism 16 that winds and overlaps the cut electromagnetic steel sheet 5 to form the wound core 1. Each mechanism of this manufacturing apparatus 11 is controlled by a control device (not shown) consisting of a computer or the like.

[0014] The conveying mechanism 13 conveys the electromagnetic steel sheet 5 in the direction of arrow A along a conveying path 18 from a supply source 17, on which a hoop material 12 formed by winding a long electromagnetic steel sheet 5 in a roll shape is set, to the winding mechanism 16. As shown typically in Fig. 1, the conveying mechanism 13 includes a first conveying roller 19 that pulls out the electromagnetic steel sheet 5 from the supply source 17 and conveys it to the fine magnetic domain processing device 14 side, a second conveying roller 20 that conveys the electromagnetic steel sheet 5 that has passed through the cutting mechanism 15 to the winding mechanism 16 side, a driving mechanism including a motor (not shown) for driving them, and the like.

[0015] The fine magnetic domain processing device 14 is configured to perform fine magnetic domain processing at a predetermined position of the electromagnetic steel sheet 5 to form the fine magnetic domain processing section 7. Details of this fine magnetic domain processing device 14 will be described later. As shown in Figs. 1 and 2, the cutting mechanism 15 includes a die 24 and a cutting blade 25 that moves up and down relative to the die 24, and is configured to cut the tip of the electromagnetic steel sheet 5 conveyed on the conveying path 18 to a predetermined length to obtain an electromagnetic steel sheet 5 having a length dimension for one turn. At this time, as shown in Fig. 2, the electromagnetic steel sheet 5 is cut at the position of the tip end of the fine magnetic domain processing section 7, and the fine magnetic domain processing section 7 is positioned at the tip of the electromagnetic steel sheet 5 to be cut next. The electromagnetic steel sheet 5 cut by the cutting mechanism 15 is further sent to the winding mechanism 16, where the wound core 1 is wound.

[0016] Now, the fine magnetic domain processing device 14 will be described. As shown in Figures 1 and 2, the fine magnetic domain processing device 14 according to this embodiment is provided downstream of the first transport roller 19 in the middle of the transport path 18 and upstream of the cutting mechanism 15. This fine magnetic domain processing device 14 executes the fine magnetic domain processing method according to this embodiment for performing fine magnetic domain processing on the surface of the electromagnetic steel sheet 5. In this embodiment, the fine magnetic domain processing device 14 is configured to include a particle arrangement mechanism 26 on the upstream side and a press mechanism 27 as a pressurizing mechanism on the downstream side.

[0017] The particle arrangement mechanism 26 executes a particle arrangement step of laying out a large number of hard particles 28 in a predetermined area on the surface of the electromagnetic steel sheet 5. In this embodiment, the particle arrangement mechanism 26 is configured to include, in order from the upstream side, a particle supplier 29 and a particle aligner 30. Here, the particles 28 used are those that can impart fine scratches to the surface of the electromagnetic steel sheet 5 by applying pressure, and are configured to have a non-spherical shape with edges from a hard material, as shown in FIG.

[0018] Specifically, the granules 28 are formed in a mixture of many different shapes, such as polygonal shapes (e.g., octahedron, hexahedron, etc.), crushed shapes, and shapes with sharp edges. Materials for the granules 28 include alumina particles, cemented carbide particles mainly composed of tungsten carbide and cobalt, and artificial diamond particles, which are highly hard. In this embodiment, the average particle size of the granules 28 is 0.2 mm or less.

[0019] As shown in Figs. 1 and 2, the granular material supplying device 29 is configured to supply a required amount of granular material 28 to the surface, i.e., the upper surface, of the electromagnetic steel sheet 5. The granular material aligning device 30 includes a guide member 30a on the upper side of the electromagnetic steel sheet 5 conveyed on the conveying path 18, and a flat bed 30b on the lower side for receiving the lower surface of the electromagnetic steel sheet 5. Although not shown in detail, the guide member 30a has a width dimension larger than that of the electromagnetic steel sheet 5, and its lower surface is an inclined surface that approaches the electromagnetic steel sheet 5 as it goes forward, and a gap of a predetermined dimension is formed between the tip edge and the upper surface of the electromagnetic steel sheet 5. Thus, the granular material aligning device 30 is configured to guide the granular material 28 supplied to the upper surface of the electromagnetic steel sheet 5 with the inclined surface and pass through a gap of a predetermined interval as the electromagnetic steel sheet 5 is conveyed, so that the granular material aligning device 30 evenly distributes the granular material 28 in a predetermined area.

[0020] The press mechanism 27 applies pressure to the predetermined area of ​​the electromagnetic steel sheet 5 where the particles 28 are arranged, and executes a pressurizing step of pressing a large number of particles 28 against the electromagnetic steel sheet 5 to form scratch marks. The press mechanism 27 is configured to include, for example, a flat bed 21, a ram 22 that moves up and down relative to the bed 21, and a press die 23 attached to the underside of the ram 22. The underside of the press die 23 has a flat mold surface that is slightly wider than the predetermined area. As a result, countless fine scratch marks are formed on the surface of the electromagnetic steel sheet 5, and the fine magnetic domain processing section 7 is provided. It is known that magnetic resistance is reduced in the fine magnetic domain processing section 7.

[0021] Next, the operation of the above configuration will be described. In the manufacturing device 11 for manufacturing the wound core 1, the conveying mechanism 13 conveys the electromagnetic steel sheet 5 from the supply source 17 in which the hoop material 12 is set, in the direction of the arrow A along the conveying path 18. At this time, in the middle of the conveying path 18, the fine magnetic domain processing device 14 applies fine magnetic domain processing to the portion that will become the cut end of the electromagnetic steel sheet 5, forming the fine magnetic domain processing section 7. This fine magnetic domain processing is performed by sequentially executing a particle arranging step in which the particle arranging mechanism 26 arranges a large number of hard particles 28 in a spread manner in a predetermined region on the surface of the electromagnetic steel sheet 5, and a pressurizing step in which the press mechanism 27 applies pressure to the region of the electromagnetic steel sheet 5 in which the particles 28 are arranged, thereby pressing the large number of particles 28 against the electromagnetic steel sheet 5 to form scratch marks.

[0022] Furthermore, the particle arrangement step is performed by sequentially carrying out a step of supplying a required amount of particles 28 to the surface of the electromagnetic steel sheet 5 by a particle supplyer 29, and a leveling step of uniformly dispersing the supplied particles 28 by a particle aligner 30. This allows the particles 28 to be arranged in a uniformly dispersed state in a predetermined region on the surface of the electromagnetic steel sheet. Then, by carrying out a pressurizing step in a state in which a large number of hard particles 28 are arranged in a predetermined region on the surface of the electromagnetic steel sheet 5, scratch marks that are a large number of fine small holes are formed by the large number of particles 28 biting into the surface of the electromagnetic steel sheet 5. This allows scratch marks to be formed by a simple method of arranging particles on the surface of the electromagnetic steel sheet 5 and applying pressure, and fine differentiation of magnetic domains on the surface of the electromagnetic steel sheet 5 is achieved.

[0023] Although not shown in the drawings or described in detail, after the pressing step is performed, a recovery step is performed in which granules 28 remaining on the surface of the electromagnetic steel sheet 5 are recovered. The recovered granules 28 are reused. Thereafter, the electromagnetic steel sheet 5 sent along the conveying path 18 is cut to predetermined dimensions at predetermined positions by the cutting mechanism 15. This results in an electromagnetic steel sheet 5 having a fine magnetic domain processing portion 7 provided in a predetermined range at the tip end. The cut electromagnetic steel sheet 5 is then sent to the winding mechanism 16, where the electromagnetic steel sheet 5 is wound and overlapped to obtain the wound core 1.

[0024] As described above, according to this embodiment, the following effects can be obtained. That is, according to the fine magnetic domain processing method and fine magnetic domain processing device 14 of this embodiment, scratch marks can be formed and fine magnetic domain processing can be performed by a simple method of arranging a large number of hard particles 28 on the surface of the electromagnetic steel sheet 5 and applying pressure. As a result, when fine magnetic domain processing is performed on the electromagnetic steel sheet 5 to reduce iron loss, the excellent effects of being able to simplify the processing process and reduce costs are achieved.

[0025] In this case, since hard granules 28 are used to form a large number of scratch marks, unlike the case where a press die having minute protrusions is used, a press die 23 having a flat mold surface can be used, and frequent repairs to the press die 23 are not required. Even if polishing of the granules 28 is required, the polishing work can be carried out much more easily than when polishing the minute protrusions of the press die.

[0026] Particularly in this embodiment, the particle arrangement step includes a step of supplying a required amount of particles 28 onto the surface of the electromagnetic steel sheet 5, and a smoothing step of evenly dispersing the supplied particles 28. This makes it possible to form uniform scratch marks within a predetermined area on the surface of the electromagnetic steel sheet 5, and thus to homogeneously refine the magnetic domains, and can be completed with a relatively simple process. Since a recovery step of recovering the particles 28 is performed after the pressurizing step, the particles 28 can be easily recovered and can be repeatedly reused, making it possible to keep processing costs sufficiently low.

[0027] In the present embodiment, the granules 28 are made of a hard material and have a non-spherical shape with edges. The granules 28 have edges, which makes it easier for them to bite into the surface of the electromagnetic steel sheet 28, and the intended function, that is, the function of forming scratch marks, can be effectively realized. In this case, even if the recovery process is performed, some of the granules 28 remain in a form that is embedded in the surface of the electromagnetic steel sheet 5. By using the electromagnetic steel sheet 5 as it is as the wound core 1, residual stress is constantly applied to the electromagnetic steel sheet 5, and the effect of fine differentiation of the magnetic domains is easily maintained. Since the granules 28 have a smaller thermal expansion coefficient than the base material of the electromagnetic steel sheet 5, the residual strain does not disappear even if annealing is performed. Even in the amorphous magnetic ribbon with a low annealing temperature, the residual strain is generated by the granules 28 remaining, and the effect of fine differentiation of the magnetic domains can be realized.

[0028] (2) Second embodiment 4 shows a second embodiment. The second embodiment differs from the first embodiment in that a roller mechanism 31 is used as a pressure mechanism for performing the pressure step instead of the press mechanism 27. The roller mechanism 31 includes a lower roller 32 provided on the lower surface side of the electromagnetic steel sheet 5 and an upper roller 33 provided on the upper surface side, and in the pressure step, the electromagnetic steel sheet 5 having the granules 28 disposed on its surface is fed while being sandwiched between the rollers 32, 33.

[0029] As a result, the relative rolling of the upper roller 33 applies pressure to the area of ​​the electromagnetic steel sheet 5 where the particles 28 are arranged, and a large number of the particles 28 are pressed against the electromagnetic steel sheet 5, forming scratch marks. This also has the excellent effect of simplifying the processing step and reducing costs when performing fine magnetic domain processing on the electromagnetic steel sheet 5 to reduce iron loss. In this case, there is no need to provide protrusions for scratching on the surfaces of the rollers 32, 33, and rollers 32, 33 with smooth surfaces can be used, making it possible to adopt inexpensive general-purpose products. Furthermore, maintenance of the roller mechanism 31 is also made easier.

[0030] (3) Third embodiment 5 and 6 show a third embodiment. In this third embodiment, the present invention is applied to the processing of electromagnetic steel sheets constituting a laminated core 41 for a transformer, for example. Here, FIG. 6 shows a schematic external configuration of the laminated core 41. The laminated core 41 includes an upper yoke portion 42 and a lower yoke portion 43 extending in the left-right direction in the figure, and three legs 44, 45, and 46 extending in the up-down direction and connecting the yoke portions 42 and 43 vertically. A winding (not shown) is attached to each of the legs 44, 45, and 46. The yoke portions 42 and 43 and the legs 44, 45, and 46 constituting the laminated core 41 are each formed by laminating a plurality of electromagnetic steel sheets 47 in the thickness direction, i.e., in the front-rear direction in the figure.

[0031] In this case, in the laminated core 41, the four upper, lower, left, and right corners of the butt portions where the left and right ends of the yoke portions 42, 43 and the upper and lower ends of the first and third legs 44, 46 are joined are cut at an angle of approximately 45 degrees to form a so-called frame-like butt shape. Also, the joints between the central portions of the yoke portions 42, 43 and the upper and lower ends of the second leg portion 45 are formed in a concave-convex butt shape, a so-called lap joint type joint, in which the upper and lower parts of the second leg portion 45 are V-shaped convex portions. The butt ends of each electromagnetic steel sheet 47 are provided with a fine magnetic domain processing section 48 in which a number of scratches have been formed to perform fine magnetic domain processing.

[0032] In this embodiment, the first and third legs 44, 46 of the laminated core 41 are manufactured as an example. As shown in FIG. 5, in the device for manufacturing the first and third legs 44, 46, a fine magnetic domain processing device 49 is provided upstream of a middle part of a conveying path 18 that conveys an electromagnetic steel sheet 47 in the direction of arrow A, and a cutting mechanism 15 is provided downstream of the fine magnetic domain processing device 49. The fine magnetic domain processing device 49 is configured to perform fine magnetic domain processing at a predetermined position of the electromagnetic steel sheet 47 by sequentially executing a particle arrangement step and a pressure step, thereby forming a fine magnetic domain processing portion 48. In this embodiment, the particle arrangement step includes a step of holding a large number of particles 28 on a tape-shaped holding member 50 and a step of placing the holding member 50 in a predetermined area on the surface of the electromagnetic steel sheet 47.

[0033] The holding member 50 is configured in the form of a tape, for example, with one surface of a band-shaped base material coated with a pressure sensitive adhesive or adhesive to form an adhesive surface. In this case, the width dimension of the holding member 50 is twice the length direction dimension of the formation area of ​​the fine magnetic domain processing section 48. A large number of particles 28 are evenly held on the adhesive surface of the holding member 50, and in this state, the holding member 50 is placed on the surface of the electromagnetic steel sheet 47 with the adhesive surface facing down. In this case, the holding member 50 is placed on the electromagnetic steel sheet 47, extending in a direction obliquely 45 degrees to the conveying direction.

[0034] The pressurizing step is performed by the roller mechanism 31 as a pressurizing mechanism. As a result, the electromagnetic steel sheet 47 on which the holding member 50 holding the granules 28 is arranged is fed and pressurized while being sandwiched between the lower roller 32 on the lower surface side and the upper roller 33 on the upper surface side. As a result, the area on the electromagnetic steel sheet 45 on which the holding member 50 is arranged is pressurized, and a large number of granules 28 are pressed against the electromagnetic steel sheet 47, forming scratch marks. In this case, the scratch marks are formed in a band shape diagonally on the electromagnetic steel sheet 47 and twice as wide as the fine magnetic domain processing portion 28.

[0035] Thereafter, the electromagnetic steel sheet 47 is cut by the cutting mechanism 15. In this case, the cutting mechanism 15 is provided with a die 24 and a cutting blade 25 extending in a direction at an angle of 45 degrees to the conveying direction. This cutting mechanism 15 is configured to cut in a direction at an angle of 45 degrees in the middle part of the processing range of the scratch mark. Therefore, the fine magnetic domain processing portion 28 is formed in both the end portion of the electromagnetic steel sheet 47 that is cut from the hoop material 12 and the leading end portion of the electromagnetic steel sheet 47 that is to be next cut from the hoop material 12 by a single processing operation.

[0036] According to the third embodiment, a tape-like holding member 50 is placed on a predetermined area on the surface of the electromagnetic steel sheet 47 while holding a large number of particles 28, and a pressurizing step is performed, whereby scratch marks can be formed in the area where the holding member 50 is placed. In this case, by applying an adhesive to the holding member 50 in advance, the particles 28 can be easily held. Moreover, the tape-like holding member 50 can be placed at any position to perform uniform fine magnetic domain processing, such as easily forming the fine magnetic domain processing portion 28 in an area extending in an oblique direction of the electromagnetic steel sheet 47 for the laminated core 41, the tip of which is cut obliquely. In addition, there is an advantage that the scattering of the particles 28 during processing can be prevented.

[0037] (4) Fourth embodiment 7 shows the fourth embodiment, which differs from the above-mentioned third embodiment in the following respects. That is, in this fourth embodiment, too, granules 28 are held by a tape-like holding member 51, and the holding member 51 is placed in a predetermined area on the surface of electromagnetic steel sheet 47 before the pressurizing step is performed. However, granules 28 are held by holding member 51 so that the density varies depending on the position, rather than being uniform. Specifically, granules 28 are held so that they are denser on the right side of the figure and sparser on the left side.

[0038] According to the fourth embodiment, it is easy to adjust the density of scratch marks on the surface of the electromagnetic steel sheet 47, and thus the degree of magnetic domain subdivision, depending on the location. In areas where the density of the grains 28 is high, the magnetic domains are further refined, and in areas where the density is relatively low, the magnetic domains are not so refined. Therefore, in addition to obtaining the same effects as in the third embodiment, it is possible to perform fine magnetic domain processing on the electromagnetic steel sheet 47, which allows the flow of magnetic flux to be controlled.

[0039] In the third and fourth embodiments, the holding members 50 and 51 are configured by applying a holding adhesive to a tape-like base material, but the holding members may be configured, for example, in a sheet shape from a fiber material capable of capturing particles, and may hold the particles. In the third and fourth embodiments, the holding members 50 and 51 are configured to hold the particles 28 on the entire surface, but by applying pressure to a portion of the surface of the holding member while holding the particles 28, it is also possible to perform fine magnetic domain processing on an arbitrary position or area, such as performing fine magnetic domain differentiation processing on an electromagnetic steel sheet in alternating stripes like a barcode.

[0040] (5) Fifth embodiment 8 shows the fifth embodiment, illustrating the essential configuration of a fine magnetic domain processing device 61 provided midway along the transport path 18 that transports the electromagnetic steel sheet 47 in the direction of arrow A. This fine magnetic domain processing device 61 is configured to perform fine magnetic domain processing at predetermined positions of the electromagnetic steel sheet 47 by sequentially performing a particle arrangement step and a pressure step, thereby forming the fine magnetic domain processing section 48. Here, an example is shown in which the fine magnetic domain processing section 48 is formed in the portions that form the V-shaped convex portions at the top and bottom of the electromagnetic steel sheet 47 that becomes the second leg 45 of the laminated core 41.

[0041] In this embodiment, the fine magnetic domain processing device 61 includes an adhesive applicator 62, a particle supplyer 63, and an excess particle remover 64, which are arranged in this order from the upstream side in the conveying direction, for carrying out the particle arrangement step, and a pressurizing mechanism (not shown) for carrying out the pressurizing step is provided downstream of the adhesive applicator 62. The adhesive applicator 62 carries out a coating step of coating a holding material, for example, an adhesive 65, on a predetermined area, in this case a V-shaped area, on the surface of the electromagnetic steel sheet 47, and includes a screen mask 66 and a coating roller 67. The screen mask 66 has a through hole 66a corresponding to the V-shaped area, and the adhesive 65 is applied in a V-shape to the surface of the electromagnetic steel sheet 47 through the through hole 66a by the coating roller 67.

[0042] The granule supplying section 63 is configured to supply a large number of granules 28 to the area on the surface of the electromagnetic steel sheet 47 where the adhesive 65 is applied and the surrounding area. As a result, a large number of granules 28 are scattered over the area including the area on the electromagnetic steel sheet 47 where the adhesive 65 is applied, and the part of the granules 28 that is in contact with the adhesive 65 is held in that position. The excess granule removing section 64 is configured to blow air at high pressure onto the area on the electromagnetic steel sheet 47 where the granules 28 are applied, for example, so that the granules 28 that are not held by the adhesive 65 are blown away and removed. As a result, the granules 28 are held in a V-shaped area on the electromagnetic steel sheet 47 by the adhesive 65.

[0043] As a result, the particle placement step is performed, and the particles can be held in the application area of ​​the electromagnetic steel sheet 47 by the adhesive 65, and in this state, the next pressurization step can be performed. Therefore, it becomes possible to perform fine magnetic domain processing at any position of the electromagnetic steel sheet 47. According to this embodiment, similar to the above-mentioned third embodiment, it is possible to simplify the processing step and reduce costs, and to reliably form scratch marks at required positions without forming scratch marks in unnecessary areas on the surface of the electromagnetic steel sheet 47. Note that the holding material is not limited to the adhesive 65, and may be a sticky material such as oil, and various materials may be used as long as they are capable of holding the particles 28.

[0044] (6) Sixth, Seventh and Other Embodiments 9 shows the sixth embodiment, which differs from the fifth embodiment in the configuration of a fine magnetic domain processing device 71. That is, this fine magnetic domain processing device 71 is configured to perform fine magnetic domain processing at a predetermined position of the electromagnetic steel sheet 47 by sequentially performing a particle arrangement step and a pressure application step, thereby forming a V-shaped fine magnetic domain processing portion 48. In this embodiment, the fine magnetic domain processing device 71 includes a mask member 72 that is placed on the surface of the electromagnetic steel sheet 47, and also includes a particle supplying section 73 that evenly scatters a large number of particles 28 onto the electromagnetic steel sheet 47 from above the mask member 72.

[0045] In this case, the mask member 72 has a predetermined region, i.e., a V-shaped region, as an opening 72a. After the step of arranging the mask member 72 at a predetermined position on the surface of the electromagnetic steel sheet 47, the particle supply unit 73 uniformly scatters a large number of particles 28 on the surface of the electromagnetic steel sheet 47 through the openings 72a of the mask member 72. In this way, a large number of particles 28 can be arranged in a predetermined region of the electromagnetic steel sheet 47 that corresponds to the shape of the openings 72a of the mask member 72, and in this state, the pressurizing step is performed. As a result, scratch marks can be formed in the V-shaped region on the surface of the electromagnetic steel sheet 47.

[0046] According to the sixth embodiment, similarly to the fifth embodiment and the like, it is possible to simplify the processing steps and reduce costs. At the same time, it becomes possible to perform fine magnetic domain processing at any position corresponding to the opening 72a formed in the mask member 72, and scratch marks can be reliably formed at required positions.

[0047] Here, in the sixth embodiment, the granules 28 arranged on the electromagnetic steel sheet 47 are not fixed, so there is a concern that they may lose their shape before the next pressurizing step is performed. Therefore, as in the seventh embodiment shown in Fig. 10, after the granules 28 are arranged in a predetermined area of ​​the electromagnetic steel sheet 47 by the fine magnetic domain processing device 71, a pressing cover 74 can be arranged so as to cover the upper surface of the arrangement area of ​​the granules 28. The pressing cover 74 is arranged on the upper surface of the electromagnetic steel sheet 47 until the pressurizing step. According to this seventh embodiment, the granules 28 arranged on the electromagnetic steel sheet 47 can be sent to the pressurizing step without losing their shape.

[0048] In the above embodiments, the particles 28 are made of a hard material such as alumina particles and have a non-spherical shape with edges, but the material, shape, particle size, etc. of the particles 28 can be changed in various ways as long as they can form scratch marks on the surface of the electromagnetic steel sheet, such as ceramic particles or metal particles. Also, in the above embodiments, the electromagnetic steel sheet is cut after fine magnetic domain processing, but the present invention can also be applied to the case where fine magnetic domain processing is performed on the electromagnetic steel sheet after it has been cut into a predetermined shape.

[0049] The above-described embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0050] In the drawings, 1 is a wound core, 5 and 47 are electromagnetic steel sheets, 7 and 48 are a micro-axis processing section, 12 is a hoop material, 13 is a conveying mechanism, 14, 49, 61, and 71 are fine magnetic domain processing devices, 15 is a cutting mechanism, 26 is a placement mechanism, 27 is a press mechanism (pressure mechanism), 28 is granules, 29, 63, and 73 are granule supply sections, 30 is a granule aligner, 31 is a roller mechanism (pressure mechanism), 41 is a laminated core, 50 and 51 are holding members, 62 is an adhesive application section, 64 is an excess granule removal section, 65 is an adhesive (holding material), 66 is a screen mask, 67 is an application roller, 72 is a mask member, and 74 is a pressing cover.

Claims

1. A method for performing fine magnetic domain processing on a surface of an electromagnetic steel sheet, comprising the steps of: a particle arranging step of arranging a large number of hard particles so as to be spread out over a predetermined area on a surface of the electromagnetic steel sheet; a pressurizing step of pressing a region of the magnetic steel sheet in which the particles are arranged to press a large number of particles against the magnetic steel sheet to form scratch marks, The particle arrangement step includes: a step of holding the plurality of particles on a tape-like holding member; and placing the holding member in a predetermined area on the surface of the electromagnetic steel sheet.

2. 2. The method for machining fine magnetic domains according to claim 1, wherein the density at which said particles are held by said holding member is varied depending on the position.

3. A method for performing fine magnetic domain processing on a surface of an electromagnetic steel sheet, comprising the steps of: a particle arranging step of arranging a large number of hard particles so as to be spread out over a predetermined area on a surface of the electromagnetic steel sheet; a pressurizing step of pressing a region of the magnetic steel sheet in which the particles are arranged to press a large number of particles against the magnetic steel sheet to form scratch marks, The particle arrangement step includes: a coating step of coating a retaining material on a predetermined area of ​​a surface of the electromagnetic steel sheet; and retaining the particles on the retaining material.

4. A method for performing fine magnetic domain processing on a surface of an electromagnetic steel sheet, comprising the steps of: a particle arranging step of arranging a large number of hard particles so as to be spread out over a predetermined area on a surface of the electromagnetic steel sheet; a pressurizing step of pressing a region of the magnetic steel sheet in which the particles are arranged to press a large number of particles against the magnetic steel sheet to form scratch marks, The particle arrangement step includes: a step of disposing a mask member, the mask member having an opening in a predetermined region on a surface of the electromagnetic steel sheet; and scattering the plurality of particles on the surface of the magnetic steel sheet through the openings in the mask member.

5. A method for performing fine magnetic domain processing on a surface of an electromagnetic steel sheet, comprising the steps of: a particle arranging step of arranging a large number of hard particles so as to be spread out over a predetermined area on a surface of the electromagnetic steel sheet; a pressurizing step of pressing a region of the magnetic steel sheet in which the particles are arranged to press a large number of particles against the magnetic steel sheet to form scratch marks, The granules are constructed from a hard material into non-spherical shapes having edges.

6. A method for performing fine magnetic domain processing on a surface of an electromagnetic steel sheet, comprising the steps of: a particle arranging step of arranging a large number of hard particles so as to be spread out over a predetermined area on a surface of the electromagnetic steel sheet; a pressing step of pressing a region of the magnetic steel sheet where the particles are arranged to press a large number of particles against the magnetic steel sheet to form scratch marks; and recovering the granules after the pressurizing step.

7. The particle arrangement step includes: supplying a required amount of the particles onto a surface of the electrical steel sheet; 7. The method for processing fine magnetic domains according to claim 5, further comprising a leveling step for uniformly dispersing the supplied particles.

8. 8. The method for processing fine magnetic domains according to claim 1, wherein the pressure step is performed by a press mechanism or a roller mechanism.

9. An apparatus for performing fine magnetic domain processing on the surface of an electromagnetic steel sheet, comprising: a particle arrangement mechanism for arranging a large number of hard particles so as to be spread out over a predetermined area on the surface of the electromagnetic steel sheet; a pressure mechanism for applying pressure to an area of ​​the electromagnetic steel sheet where the particles are arranged, and pressing a large number of particles against the electromagnetic steel sheet to form scratch marks, The particle arrangement mechanism includes: The plurality of particles are held on a tape-like holding member, A fine magnetic domain processing device that places the holding member in a predetermined area on the surface of the electromagnetic steel sheet.

10. An apparatus for performing fine magnetic domain processing on the surface of an electromagnetic steel sheet, comprising: a particle arrangement mechanism for arranging a large number of hard particles so as to be spread out over a predetermined area on the surface of the electromagnetic steel sheet; a pressure mechanism for applying pressure to an area of ​​the electromagnetic steel sheet where the particles are arranged, and pressing a large number of particles against the electromagnetic steel sheet to form scratch marks, The particle arrangement mechanism includes: Applying a retaining material to a predetermined area on the surface of the electromagnetic steel sheet; A fine magnetic domain processing device for holding the particles on the holding material.

11. An apparatus for performing fine magnetic domain processing on the surface of an electromagnetic steel sheet, comprising: a particle arrangement mechanism for arranging a large number of hard particles so as to be spread out over a predetermined area on the surface of the electromagnetic steel sheet; a pressure mechanism for applying pressure to an area of ​​the electromagnetic steel sheet where the particles are arranged, and pressing a large number of particles against the electromagnetic steel sheet to form scratch marks, The particle arrangement mechanism includes: a mask member having an opening in a predetermined region on a surface of the electromagnetic steel sheet is placed on the surface of the electromagnetic steel sheet; a fine magnetic domain processing device for scattering the numerous particles on the surface of the electromagnetic steel sheet through the openings in the mask member;

12. An apparatus for performing fine magnetic domain processing on the surface of an electromagnetic steel sheet, comprising: a particle arrangement mechanism for arranging a large number of hard particles so as to be spread out over a predetermined area on the surface of the electromagnetic steel sheet; a pressure mechanism for applying pressure to an area of ​​the electromagnetic steel sheet where the particles are arranged, and pressing a large number of particles against the electromagnetic steel sheet to form scratch marks, The particle arrangement mechanism is a fine magnetic domain processing device that arranges the numerous particles made of a hard material and having a non-spherical shape with edges.

13. An apparatus for performing fine magnetic domain processing on the surface of an electromagnetic steel sheet, comprising: a particle arrangement mechanism for arranging a large number of hard particles so as to be spread out over a predetermined area on the surface of the electromagnetic steel sheet; a pressure mechanism for applying pressure to an area of ​​the electromagnetic steel sheet where the particles are arranged, and pressing a large number of particles against the electromagnetic steel sheet to form scratch marks; and a recovery mechanism for recovering the granules after pressure is applied.

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