JP2021039963A - Manufacturing apparatus of wound core and manufacturing method of wound core - Google Patents

Abstract

To provide a manufacturing apparatus of a wound core and a manufacturing method of a wound core for manufacturing a wound core that is configured by winding up a multiple electromagnetic steel sheets, which are capable of performing efficient manufacturing while applying fine magnetic domain processing to reduce loss to electromagnetic steel sheets.SOLUTION: A manufacturing apparatus of a wound core according to an embodiment includes: a transport mechanism which sequentially transports a hoop material of an electromagnetic steel sheet from a supply source of the hoop material along a transport path; a fine magnetic domain processing unit which is provided in an intermediate portion of the transport path and which applies fine magnetic domain processing to a portion of the hoop material, the portion being a cut end of the electromagnetic steel sheet; a cutting mechanism which is provided in an intermediate portion of the transport path and which cuts the hoop material to obtain electromagnetic steel sheets with predetermined dimensions; and a winding mechanism which winds up electromagnetic steel sheets having been cut by the cutting mechanism.SELECTED DRAWING: Figure 1

Description

An embodiment of the present invention relates to a winding core manufacturing apparatus and a winding core manufacturing method for manufacturing a wound core for a stationary induction device.

Static induction equipment For example, in the iron core of a transformer, a so-called one-turn cut type is constructed by winding a plurality of strip-shaped electromagnetic steel plates such as silicon steel plates while providing at least one butt joint for each winding. There is what is called a winding iron core (see, for example, Patent Document 1). In this product, at the butt joint portion of the electromagnetic steel sheet for each turn, the electromagnetic steel sheet is wound while being shifted in a stepwise manner. At this time, for example, a non-magnetic sheet member is arranged at the joint portion, and an air gap having a constant width is provided.

Japanese Unexamined Patent Publication No. 2016-28406

However, in the case of a wound steel core having a joint portion and an air gap provided while shifting in a stepped manner as described above, the magnetic flux flowing through the iron core is spread over the electromagnetic steel sheets adjacent to each other in the stacking direction at the air gap portion. It will flow. Therefore, there is a problem that the magnetic resistance becomes large at the joint and a loss, that is, an iron loss occurs. Therefore, in recent years, in order to reduce the loss, it has been proposed that the surface of the electromagnetic steel sheet constituting the iron core is subjected to fine magnetic domain processing in which laser irradiation is performed in a grid pattern in the vertical and horizontal directions with respect to the rolling direction. In this case, when the wound iron core is manufactured, it is desired that the wound iron core is efficiently manufactured after being subjected to fine magnetic domain processing.

Therefore, in the case of manufacturing a wound iron core formed by winding a plurality of electromagnetic steel sheets, efficient manufacturing is performed while including applying fine magnetic domain processing to the electrical steel sheet in order to reduce loss. Provided is an apparatus for manufacturing a wound steel core and a method for manufacturing a wound steel core.

The winding iron core manufacturing apparatus according to the embodiment is an apparatus for manufacturing a wound iron core for a static induction device by winding a plurality of electromagnetic steel sheets cut to a predetermined size from a hoop material, and is a device for manufacturing a wound steel core for a stationary induction device. A transport mechanism for sequentially transporting the hoop material from the material supply source through the transport path, and a fine magnetic zone processing on a portion of the hoop material that is provided in the middle of the transport path and is a cut end portion of the electromagnetic steel sheet. A fine magnetic zone processing device for applying the above, a cutting mechanism provided in the middle of the transport path to cut the hoop material into an electromagnetic steel sheet having a predetermined size, and a winding mechanism for winding the electromagnetic steel sheet cut by the cutting mechanism. It has a mechanism.

The method for manufacturing a wound steel core according to the embodiment is a method for manufacturing a wound steel core for a static induction device by winding a plurality of electromagnetic steel sheets cut to a predetermined size from a hoop material, and the hoop of the electromagnetic steel sheet. A fine magnetic domain processing step in which a fine magnetic domain processing is performed on a portion to be a cut end portion of the electrical steel sheet in the middle of the transport path while sequentially transporting the hoop material from a material supply source, and the hoop. It includes a cutting step of cutting a material into an electromagnetic steel sheet having a predetermined size.

The figure which shows the 1st Embodiment and shows outline | summary of the whole structure of the manufacturing apparatus. Perspective view schematically showing the configuration of the fine magnetic domain processing apparatus and the cutting mechanism portion. Enlarged bottom view of the machined surface of the press mold The second embodiment is shown, and the perspective view which shows the structure of the fine magnetic domain processing apparatus and the cutting mechanism part schematicly. The third embodiment is shown, and the perspective view which shows the structure of the fine magnetic domain processing apparatus and the cutting mechanism part schematicly. The fourth embodiment is shown, and the perspective view which shows the structure of the fine magnetic domain processing apparatus and the cutting mechanism part schematicly. FIG. 5 is a perspective view schematically showing a configuration of a fine magnetic domain processing apparatus and a cutting mechanism portion, showing a fifth embodiment. Enlarged perspective view of the fine magnetic domain processed part of the hoop material A sixth embodiment is shown, and is a perspective view of a fine magnetic domain processing apparatus portion. The seventh embodiment is shown, and is a perspective view of a fine magnetic domain processing apparatus portion. 8th embodiment is shown, and is a perspective view of a fine magnetic domain processing apparatus portion.

Hereinafter, some embodiments applied to the manufacture of a wound iron core for a transformer as a static induction device will be described with reference to the drawings. The parts common to the plurality of embodiments are designated by the same reference numerals, and new illustrations and repetitive explanations will be omitted.

(1) First Embodiment Hereinafter, the first embodiment will be described with reference to FIGS. 1 to 3. First, the winding core 1 manufactured by the winding core manufacturing apparatus and manufacturing method according to the present embodiment will be briefly described. As shown in a partially inclined state in FIG. 1, the wound iron core 1 connects the two legs 2 and 2 extending in the vertical direction and the upper ends and lower ends of the legs 2 and 2 to the left and right. The corner portion is formed in a rectangular ring shape having a rounded corner portion having the joint iron portions 3 and 3. Windings (not shown) are attached to the legs 2 and 2 to form a transformer.

The wound iron core 1 is a so-called one-turn cut type. That is, in the wound steel core 1, for example, a strip-shaped hoop material such as a silicon steel plate is cut to a required size for each winding to obtain an electromagnetic steel plate 5, and the ends of each of the electromagnetic steel plates 5 are abutted against each other. It is configured by winding a plurality of sheets in the inner and outer peripheral directions while providing the joint portion 6. A grain-oriented electrical steel sheet 5 is used as the electrical steel sheet 5, and the longitudinal direction, that is, the winding direction is the rolling direction. The joint portion 6 is configured so as to come to substantially the central portion of the lower joint iron portion 3. At this time, the joint portion 6 for each winding is configured to be laminated while being wound by shifting the electromagnetic steel sheet 5 in the winding direction (diameter direction) in a stepwise manner at a constant pitch. The joints 6 are arranged so as to be sequentially shifted to the left side in the drawing from the inner peripheral side to the outer peripheral side so that several sheets of the electromagnetic steel sheets 5 are repeated as one block in the winding direction.

At this time, in the present embodiment, as shown in FIG. 2, the fine magnetic domain processing is performed by strain at the portion of the tip surface of each of the electrical steel sheets 5 that wraps with the joint 6 of the other electrical steel sheets 5. The fine magnetic domain processing unit 7 which has been subjected to the above-mentioned processing is provided. As shown by a mesh-like line in FIG. 2 for convenience, the fine magnetic domain processing unit 7 covers the entire width direction of the electrical steel sheet 5 among the electrical steel sheets 5, and has a certain range, for example, a deviation pitch of 2 of the joint portion 6. It is provided in the range of about twice the length dimension. This range is defined as the range in which the magnetic flux passes over another overlapping electromagnetic steel sheet 5 on the surface of the end portion of the electrical steel sheet 5.

Here, the manufacturing apparatus 11 according to the present embodiment for manufacturing the wound iron core 1 will be described below. FIG. 1 schematically shows the overall configuration of the manufacturing apparatus 11 according to the present embodiment. The manufacturing apparatus 11 is roughly divided into a transport mechanism 13 that conveys the hoop material 12 to be the electromagnetic steel sheet 5, and a fine magnetic domain processing that performs fine magnetic domain processing on a portion of the hoop material 12 that is the cut end portion of the electromagnetic steel sheet 5. The device 14 includes a cutting mechanism 15 that cuts the hoop material 12 to form an electromagnetic steel sheet 5 having a predetermined size, and a winding mechanism 16 that winds the cut electromagnetic steel sheet 5 into a wound iron core 1. Each mechanism of the manufacturing apparatus 11 is controlled by a control apparatus (not shown) including a computer or the like.

The transport mechanism 13 sequentially transports the hoop material 12 in the direction of arrow A through the transport path 18 from the supply source 17 in which the long hoop material 12 is wound in a roll shape to the winding mechanism 16. Is what you do. As schematically shown in FIG. 1, the transport mechanism 13 draws the hoop material 12 from the supply source 17 and sends it to the fine magnetic domain processing device 14 side, and the hoop material 12 (electromagnetic) passes through the first transport roller 19 and the cutting mechanism 15. It is provided with a second transfer roller 20 for feeding the steel plate 5) to the winding mechanism 16 side, a drive mechanism (not shown) including a motor for driving them, and the like.

The fine magnetic domain processing device 14 is provided in the downstream portion of the first transfer roller 19 in the middle of the transfer path 18, and in the present embodiment, the surface of the hoop material 12 is subjected to fine magnetic domain processing by a heat pressing device. It is configured as follows. That is, as shown in FIG. 2, the fine magnetic domain processing apparatus 14 includes, for example, a flat bed 21, a ram 22 that moves up and down with respect to the bed 21, and a press mold 23 attached to the lower surface of the ram 22. Imprinting is performed on the hoop material 12 in the heated state of the press mold 23.

In this case, as shown in FIG. 3, a large number of needle-shaped protrusions 23a are provided on the surface of the press mold 23 over the entire surface. By the imprinting process in the fine magnetic domain processing device 14, thermal stress and mechanical stress are applied to a predetermined range on the surface of the hoop material 12, and innumerable fine markings are made by the protrusions 23a. As a result, it is known that the fine magnetic domain processing unit 7 is provided on the surface of the hoop material 12, and the magnetic resistance is reduced in the fine magnetic domain processing unit 7.

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 with respect to the die 24, and provides a tip portion of a hoop material 12 that is conveyed through a transfer path 18. , It is configured to be cut to a predetermined length to obtain an electromagnetic steel plate 5 having a length dimension for one turn. At this time, as shown in FIG. 2, the hoop material 12 is cut at the position of the front end portion of the fine magnetic domain processing unit 7, and the fine magnetic domain processing unit 7 is located at the tip of the electromagnetic steel sheet 5 to be cut next. It is supposed to be done. The electromagnetic steel sheet 5 cut by the cutting mechanism 15 is further sent to the winding mechanism 16 to perform the winding operation of the winding iron core 1.

Next, the manufacturing procedure of the wound iron core 1 in the manufacturing apparatus 11 having the above configuration will be described. In the manufacturing apparatus 11 of the wound iron core 1 having the above configuration, the hoop material 12 is sequentially transported along the transport path 18 in the direction of arrow A from the supply source 17 of the hoop material 12 by the transport mechanism 13. Then, in the middle of the transport path 18, the fine magnetic domain processing apparatus 14 performs fine magnetic domain processing on the portion of the hoop material 12 that becomes the cut end portion of the electromagnetic steel sheet 5 to form the fine magnetic domain processing unit 7. (Micromagnetic domain processing process). After that, the hoop material 12 fed through the transport path 18 is cut by the cutting mechanism 15 to obtain an electromagnetic steel plate 5 having a predetermined size (cutting step).

As a result, an electromagnetic steel sheet 5 in which the fine magnetic domain processing portion 7 is provided in a predetermined range of the tip portion can be obtained. After that, the electromagnetic steel plate 5 is wound by the winding mechanism 16 to obtain the wound iron core 1. In this case, in the manufacturing apparatus 11, while the hoop material 12 is being conveyed through the transport path 18, a fine magnetic domain processing process is performed at a required position of the hoop material 12, and the hoop material 12 is cut as it is to form an electromagnetic steel sheet 5 having a predetermined size. Is sent to the winding mechanism 16. At this time, the electrical steel sheet 5 sent to the winding mechanism 16 is cut to a predetermined size, and the fine magnetic domain processing section 7 is provided at the cut end portion thereof.

As described above, according to the present embodiment, the transport mechanism 13 for transporting the hoop material 12 from the supply source 17 to the winding mechanism 16 is provided, and the fine magnetic domain processing device 14 and the cutting mechanism 15 are provided in the middle of the transport path 18. Including a fine magnetic domain processing step of performing fine magnetic domain processing on a portion to be a cut end portion of the electromagnetic steel plate 5 in the middle portion of the transport path 18, and a cutting step of cutting the hoop material 12 into an electromagnetic steel plate 5 having a predetermined size. .. Therefore, in a series of steps from feeding out the hoop material 12 to winding it as the wound iron core 1, it is possible to include applying fine magnetic domain processing to the electromagnetic steel sheet 5 in order to reduce the loss, which is efficient. It has an excellent effect of being able to be manufactured.

In particular, in the present embodiment, the cutting mechanism 15 is configured to perform cutting at the end of the fine magnetic domain processing unit 7 of the hoop material 12 downstream of the fine magnetic domain processing apparatus 14. As a result, the hoop material 12 is subjected to the fine magnetic domain processing by the fine magnetic domain processing apparatus 14, and then the cutting process is performed by the cutting mechanism 15. Therefore, the fine magnetic domain processing and the cutting processing can be reliably performed respectively. Further, in the present embodiment, the fine magnetic domain processing device 14 is configured to perform fine magnetic domain processing on the surface of the hoop material 12 by a hot press device. As a result, the fine magnetic domain processing can be performed by pressing the heated press mold 23 against the surface of the hoop material 12, which requires a relatively simple configuration and the fine magnetic domain processing unit 7 required for simple processing. Can be formed.

(2) Second and Third Embodiments FIG. 4 shows a second embodiment. The winding iron core manufacturing apparatus of the second embodiment is different from the manufacturing apparatus 11 of the first embodiment in the following configuration. That is, in the present embodiment, a fine magnetic domain processing device 31 also also composed of a heat press device is provided in the downstream portion of the first transport roller 19 in the middle portion of the transport path 18. The fine magnetic domain processing apparatus 31 includes a press mold 32 having a large number of protrusions, and the press mold 32 conveys the hoop material 12 as compared with the press mold 23 of the first embodiment. It has twice the size in the direction, that is, the longitudinal direction. By the fine magnetic domain processing apparatus 31, the fine magnetic domain processing unit 33 is provided on the surface of the hoop material 12 in a range twice as long as that in the first embodiment.

In the present embodiment, the cutting mechanism 15 is provided downstream of the fine magnetic domain processing device 31, and the cutting mechanism 15 is the fine magnetic domain processing unit 33 of the hoop material 12 by the fine magnetic domain processing device 31. It is configured to cut in the middle part of the processing range of. According to this, in the hoop material 12, the cutting process is performed by the cutting mechanism 15 in the intermediate portion of the range processed by the fine magnetic domain processing device 31. Therefore, both the terminal portion of the electrical steel sheet 5 separated from the hoop material 12 and the tip portion of the electrical steel sheet 5 to be separated from the hoop material 12 are subjected to fine magnetic domain processing by a single processing operation. Will be done.

As a result, according to the second embodiment, the loss is reduced during the series of steps from the feeding of the hoop material 12 to the winding as the wound steel core 1 as in the first embodiment. It is possible to include applying the fine magnetic domain processing for the purpose to the electromagnetic steel sheet 5, and it is possible to obtain an excellent effect that efficient production can be performed. In addition to this, more efficient fine magnetic domain processing can be performed.

FIG. 5 shows a third embodiment. The difference between the winding iron core manufacturing apparatus of the third embodiment and the manufacturing apparatus 11 of the first embodiment is that the fine magnetic domain processing apparatus 41 is integrated with a cutting mechanism, so to speak. That is, the fine magnetic domain processing device 41 is also composed of a heat pressing device, a bed 42 that also serves as a die for the cutting device, a ram 43 that moves up and down with respect to the bed 42, and a press mold 23 attached to the lower surface of the ram 43. The cutting blade 44 is attached to the front surface of the side surface of the ram 43 in the transport direction.

As a result, the hoop material 12 conveyed in the transport path 18 is subjected to imprinting on the hoop material 12 in the heated state of the press mold 23 by lowering the ram 43 in the fine magnetic domain processing device 41, and the surface is subjected to imprinting. A fine magnetic domain processing unit 7 is provided. At the same time, the hoop material 12 is cut by the cutting blade 44 at the position of the front end portion of the fine magnetic domain processing portion 7, and becomes an electromagnetic steel plate 5 having the fine magnetic domain processing portion 7 at the tip portion, and the winding mechanism 16 Will be sent to. The fine magnetic domain processing section 7 is located at the tip of the electromagnetic steel sheet 5 to be cut next. In this way, the fine magnetic domain processing by the fine magnetic domain processing device 41 and the cutting processing by the cutting mechanism on the hoop material 12 are collectively performed at the same timing.

According to the third embodiment as described above, in order to reduce the loss during a series of steps from the feeding of the hoop material 12 to the winding as the wound steel core 1 as in the first embodiment. It is possible to include applying the fine magnetic domain processing of the above to the electromagnetic steel sheet 5, and it is possible to obtain an excellent effect that efficient production can be performed. In the present embodiment, the fine magnetic domain processing on the hoop material 12 and the cutting processing of the electromagnetic steel sheet 5 by the cutting mechanism can be performed at once, and more efficient manufacturing work can be performed. There is also an advantage that the cutting position of the hoop material 12 is less likely to be displaced with respect to the fine magnetic domain processing unit 7.

(3) Fourth to Sixth Embodiments FIG. 6 shows a fourth embodiment, and the difference from the first embodiment is in the configuration of the fine magnetic domain processing apparatus 51. That is, in the present embodiment, instead of the fine magnetic domain processing device 14 composed of the heat pressing device, the fine magnetic domain processing device 51 is configured to perform fine magnetic domain processing by irradiating the surface of the hoop material 12 with a laser. Although not shown in detail, the fine magnetic domain processing apparatus 51 includes a scanning apparatus including a laser oscillator, a galvano mirror, and the like, and continuously linearly extends a laser irradiation process on the surface of the hoop material 12 to each other. It is configured so that a large number of lines are applied in a grid pattern in two intersecting vertical and horizontal directions, that is, in the X and Y directions.

By the laser irradiation treatment by the fine magnetic domain processing apparatus 51, grid-like linear marks are formed on the surface of the hoop material 12, and the formation range of the linear marks is the fine magnetic domain processing unit 52. The fine magnetic domain processing unit 52 is formed by finely differentiating the magnetic domain on the surface of the hoop material 12, and the magnetic resistance in this portion can be reduced. The interval at which linear marks are formed by the laser irradiation treatment is, for example, 2.0 mm or less in both the vertical and horizontal directions. More preferably, it is 0.5 mm or less. The linear marks may be provided in a form in which the hoop material 12 is inclined in a diagonal direction with respect to the rolling direction, that is, the longitudinal direction.

According to the fourth embodiment as described above, in order to reduce the loss during a series of steps from the feeding of the hoop material 12 to the winding as the wound steel core 1 as in the first embodiment. It is possible to include applying the fine magnetic domain processing of the above to the electromagnetic steel sheet 5, and it is possible to obtain an excellent effect that efficient production can be performed. Then, in the present embodiment, the fine magnetic domain processing apparatus 51 can reliably perform the fine magnetic domain processing by irradiating the surface of the hoop material 12 with a laser, and can perform highly reliable processing.

7 and 8 show a fifth embodiment. As shown in FIG. 7, the fifth embodiment differs from the fourth embodiment in that, in addition to the fine magnetic domain processing apparatus 51, the back surface of the hoop material 12, that is, the lower surface in the figure is irradiated with a laser. It is configured to be provided with a fine magnetic domain processing device 53 for performing fine magnetic domain processing. As a result, the fine magnetic domain processing device 51 forms the fine magnetic domain processing unit 52 on the surface of the hoop material 12, and the fine magnetic domain processing device 53 forms the fine magnetic domain processing unit 54 on the back surface of the hoop material 12 (see FIG. 8). Is formed.

At this time, as shown in FIG. 8, the fine magnetic domain processing unit 52 and the fine magnetic domain processing unit 54 are provided within a predetermined length range of the hoop material 12, but the positions are shifted on the front and back surfaces. For example, it is provided at a position shifted by half a pitch. Here, when laser irradiation is adopted for fine magnetic domain processing, the hoop material 12 is made convex on the side opposite to the laser irradiation surface due to thermal expansion and contraction of the hoop material 12 on the surface side irradiated with the laser. There are circumstances in which warpage and distortion occur. However, in the present embodiment, as shown in FIG. 8, the laser irradiation process can be performed while canceling the thermal strain of the hoop material 12 on both sides, and the dimensional accuracy is lowered due to the occurrence of warpage and strain. Etc. can be solved.

Therefore, according to the fifth embodiment, as in the fourth embodiment, in order to reduce the loss during a series of steps from the feeding of the hoop material 12 to the winding as the wound steel core 1. It is possible to include applying the fine magnetic domain processing of the above to the electromagnetic steel sheet 5, and it is possible to obtain an excellent effect that efficient production can be performed. Further, the fine magnetic domain processing devices 51 and 53 can reliably perform the fine magnetic domain processing by irradiating the hoop material 12 with a laser, and can perform highly reliable processing. Further, it is possible to suppress the occurrence of thermal strain of the hoop material 12 due to laser irradiation. Since both sides of the end portion of the electrical steel sheet 5 are subjected to fine magnetic domain processing, the magnetic resistance at the joint portion when the wound steel core 1 is used can be further reduced, which is more effective in reducing the loss. ..

FIG. 9 shows a sixth embodiment, which differs from the fourth embodiment in the following points. That is, in the sixth embodiment, the straightening roller 55 is provided in the portion of the transport path 18 where the surface of the hoop material 12 is irradiated with the laser by the fine magnetic domain processing device 51. The straightening roller 55 receives the lower surface side of the hoop material 12 during laser irradiation by the fine magnetic domain processing device 51, so that the hoop material 12 is curved so as to be convex toward the upper surface side assuming heat shrinkage due to thermal strain. Is to be given. As a result, the laser irradiation of the hoop material 12 is performed while correcting the thermal strain by the straightening roller 55.

Therefore, according to the sixth embodiment, in order to reduce the loss during a series of steps from the feeding of the hoop material 12 to the winding as the wound steel core 1 as in the fourth embodiment. It is possible to include applying the fine magnetic domain processing of the above to the electromagnetic steel sheet 5, and it is possible to obtain an excellent effect that efficient production can be performed. Further, the fine magnetic domain processing apparatus 51 can reliably perform the fine magnetic domain processing by irradiating the hoop material 12 with a laser, and can perform highly reliable processing. Further, since the laser irradiation is performed while correcting the thermal strain of the hoop material 12 by the straightening roller 55, the thermal strain of the hoop material 12 and the adverse effects associated therewith can be effectively prevented.

(4) Seventh, Eighth Embodiment, Other Embodiments FIG. 10 shows a seventh embodiment. In the seventh embodiment, the configuration of the fine magnetic domain processing apparatus 61 is different from that of the first embodiment and the like. That is, the fine magnetic domain processing device 61 is a cradle 62 that receives the lower surface of the hoop material 12, a needle-shaped tool 63 provided above the pedestal 62, and a drive mechanism that moves the needle-shaped tool 63 back and forth and left and right (not shown). It is configured with and. The needle-shaped tool 63 is configured by mounting a plurality of cutting tools 63b called scribing needles side by side on the lower surface of a horizontally long handle portion 63a.

The fine magnetic domain processing device 61 repeatedly moves the needle-shaped tool 63 in the vertical and horizontal directions, that is, in the arrow B and arrow C directions by the drive mechanism in a state where the bite 63b is pressed against the surface of the hoop material 12, and the hoop. A plurality of bites 63b extend in the vertical and horizontal directions on a predetermined region on the surface of the material 12 so as to make a large number of scratches. As a result, the fine magnetic domain processing unit 64 is formed on the surface of the hoop material 12.

According to the seventh embodiment as described above, in order to reduce the loss during a series of steps from the feeding of the hoop material 12 to the winding as the wound steel core 1 as in the first embodiment. It is possible to include applying the fine magnetic domain processing of the above to the electromagnetic steel sheet 5, and it is possible to obtain an excellent effect that efficient production can be performed. Then, in the present embodiment, the fine magnetic domain processing can be mechanically performed by a relatively simple process such as scratching a large number of scratches while moving the needle-shaped tool 63 on the surface of the hoop material 12. It is also possible to prevent the hoop material 12 from being warped due to thermal strain.

FIG. 11 shows an eighth embodiment, and the configuration of the fine magnetic domain processing apparatus 71 is different from that of the first embodiment and the like. That is, the fine magnetic domain processing apparatus 71 includes a table 72 that receives the lower surface of the hoop material 12, and two cutter rollers 73 and 74 that are provided above the table 72 in the front-rear direction in the transport direction. Both the cutter rollers 73 and 74 have a cylindrical shape extending in the entire width direction of the hoop material 12, and are rotatable about a rotation axis extending horizontally in a direction orthogonal to the transport direction of the hoop material 12. .. The cutter rollers 73 and 74 are lowered and pressed against the position where the fine magnetic domain processing is to be performed on the surface of the hoop material 12.

A plurality of blade portions 73a, 74a extending in an inclined direction with respect to the axial direction are provided on the outer peripheral surfaces of the cutter rollers 73, 74, respectively. At this time, the inclination direction of the blade portion 73a and the blade portion 74a is opposite to the axial direction. The blade portions 73a and 74a may be provided in a spiral shape. In this fine magnetic domain processing apparatus 71, the cutter rollers 73 and 74 are pressed downward against the surface of the hoop material 12 on the table 72, and the hoop material 12 is conveyed in the direction of arrow A while being conveyed to the cutter. The rollers 73 and 74 are rotated in the direction of arrow D. As a result, the blade portions 73a and 74a of the cutter rollers 73 and 74 make a mesh-like scratch on the surface of the hoop material 12 as if a large number of rhombuses are combined, and the fine magnetic domain processing portion 75 is formed. ..

According to the eighth embodiment as described above, in order to reduce the loss during a series of steps from the feeding of the hoop material 12 to the winding as the wound steel core 1 as in the first embodiment. It is possible to include applying the fine magnetic domain processing of the above to the electromagnetic steel sheet 5, and it is possible to obtain an excellent effect that efficient production can be performed. Then, in the present embodiment, the fine magnetic domain processing can be mechanically performed by a relatively simple process such as scratching the surface of the hoop material 12 with the cutter rollers 73 and 74 in large numbers. It is also possible to prevent the hoop material 12 from being warped due to thermal strain.

In each of the above-described embodiments, the fine magnetic domain processing portion is provided by imprinting or laser irradiation on the surface of the hoop material, but in addition to this, the surface of the hoop material is thermally heated to about several hundred ° C. Fine magnetic domain processing may be performed by applying stress. The embodiments described above are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

In the drawing, 1 is a wound iron core, 5 is an electromagnetic steel plate, 6 is a joint, 7, 33, 52, 54, 64, 75 are fine magnetic domain processing parts, 11 is a manufacturing apparatus, 12 is a hoop material, and 13 is a transport mechanism. , 14, 31, 41, 51, 53, 61, 71 are fine magnetic domain processing devices, 15 is a cutting mechanism, 16 is a winding mechanism, 17 is a supply source, 18 is a transport path, 23 and 32 are press molds, 25, 44 is a cutting blade, 55 is a straightening roller, 63 is a needle-shaped tool, and 73 and 74 are cutter rollers.

Claims (11)

It is a device for manufacturing a wound iron core for a static induction device by winding a plurality of electromagnetic steel sheets cut to a predetermined size from a hoop material.
A transport mechanism for sequentially transporting the hoop material from the source of the hoop material of the electromagnetic steel sheet, and a transport mechanism.
A fine magnetic domain processing device provided in the middle of the transport path and performing fine magnetic domain processing on a portion of the hoop material which is a cut end portion of the electromagnetic steel sheet.
A cutting mechanism provided in the middle of the transport path and cutting the hoop material into an electromagnetic steel sheet having a predetermined size.
A winding iron core manufacturing apparatus including a winding mechanism for winding electromagnetic steel sheets cut by the cutting mechanism. The fine magnetic domain processing apparatus performs fine magnetic domain processing on a predetermined range in the middle of the hoop material to be conveyed.
The production of the wound iron core according to claim 1, wherein the cutting mechanism is configured to perform cutting at the end of the processing range of the hoop material in the fine magnetic domain processing apparatus downstream of the fine magnetic domain processing apparatus. apparatus. The fine magnetic domain processing apparatus performs fine magnetic domain processing on a predetermined range in the middle of the hoop material to be conveyed.
The winding iron core manufacturing apparatus according to claim 1, wherein the cutting mechanism is configured to cut the hoop material in the middle portion of the processing range of the fine magnetic domain processing apparatus downstream of the fine magnetic domain processing apparatus. .. The winding iron core manufacturing apparatus according to claim 1, wherein the fine magnetic domain processing by the fine magnetic domain processing apparatus and the cutting processing by the cutting mechanism are collectively performed on the hoop material at the same timing. The device for manufacturing a wound iron core according to any one of claims 1 to 4, wherein the fine magnetic domain processing device is configured to perform fine magnetic domain processing on the surface of the hoop material by a hot press device. The winding iron core manufacturing apparatus according to any one of claims 1 to 4, wherein the fine magnetic domain processing apparatus is configured to perform fine magnetic domain processing by irradiating the surface of the hoop material with a laser. The apparatus for manufacturing a wound iron core according to claim 6, wherein the laser irradiation is performed in a state where the positions of the hoop materials are shifted from each other. The apparatus for manufacturing a wound iron core according to claim 6, wherein the laser irradiation is performed on the hoop material while correcting thermal strain with a straightening roller. The winding iron core manufacturing apparatus according to any one of claims 1 to 4, wherein the fine magnetic domain processing apparatus is configured to scratch a surface of the hoop material with a needle-like tool in a large number. The winding iron core manufacturing apparatus according to any one of claims 1 to 4, wherein the fine magnetic domain processing apparatus is configured to make a large number of scratches on the surface of the hoop material by a cutter roller. It is a method for manufacturing a wound steel core for a stationary induction device by winding a plurality of electromagnetic steel sheets cut to a predetermined size from a hoop material.
Fine magnetic domain processing is performed on the cut end portion of the electrical steel sheet in the middle of the transport path while the hoop material is sequentially transported from the source of the hoop material of the electrical steel sheet. Process and
A method for manufacturing a wound steel core, which includes a cutting step of cutting the hoop material into an electromagnetic steel sheet having a predetermined size.

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