JP7274987B2 - Wound core manufacturing apparatus and wound core manufacturing method - Google Patents

Description

TECHNICAL FIELD Embodiments of the present invention relate to a wound core manufacturing apparatus and a wound core manufacturing method for manufacturing a wound core for a stationary induction device.

The iron core of a stationary induction device, such as a transformer, is a so-called one-turn cut type, in which a plurality of strip-shaped electromagnetic steel sheets such as silicon steel sheets are wound while providing at least one butt joint for each turn. There is a so-called wound iron core (see Patent Document 1, for example). In this device, the magnetic steel sheets are wound in a stepwise manner at the butt joints of the magnetic steel sheets for each turn. At this time, for example, a non-magnetic sheet member is arranged at the joint, and an air gap with a constant width is provided.

JP 2016-28406 A

However, in a wound core having joints and air gaps provided with a stepwise shift as described above, the magnetic flux flowing through the core is allowed to cross the electromagnetic steel sheets adjacent in the lamination direction at the air gap portion. will flow. As a result, there is a problem that the magnetic resistance increases at the junction and a loss, that is, a core loss occurs. Therefore, in recent years, in order to reduce the loss, it has been proposed to subject the surface of the electromagnetic steel sheet constituting the iron core to fine magnetic domain processing by irradiating the surface of the magnetic steel sheet in a grid pattern in the vertical and horizontal directions with respect to the rolling direction. In this case, when manufacturing the wound core, it is desirable to perform fine magnetic domain processing and then manufacture the wound core efficiently.

Therefore, in manufacturing a wound core constructed by winding a plurality of electromagnetic steel sheets, it is necessary to perform efficient manufacturing while including subjecting the electromagnetic steel sheets to fine magnetic domain processing for reducing loss. To provide a wound core manufacturing apparatus and a wound core manufacturing method capable of

A wound core manufacturing apparatus according to an embodiment is an apparatus for manufacturing a wound core for a static induction device by winding a plurality of magnetic steel sheets cut to a predetermined size from a hoop material, wherein the hoop is made of the magnetic steel sheets. a conveying mechanism for sequentially conveying the hoop material from a material supply source along a conveying path; a fine magnetic domain processing device for performing a fine magnetic domain processing, a cutting mechanism provided in the middle of the conveying path for cutting the hoop material into an electromagnetic steel sheet of a predetermined size, and a winding for winding the electromagnetic steel sheet cut by the cutting mechanism mechanism.

A method for manufacturing a wound core according to an embodiment is a method for manufacturing a wound core for a stationary induction device by winding a plurality of electromagnetic steel sheets cut to a predetermined size from a hoop material, wherein the hoop is made of the electromagnetic steel sheet. A fine magnetic domain processing step of performing fine magnetic domain processing on a portion to be a cut end of the electromagnetic steel sheet in the middle of the conveying route while sequentially conveying the hoop member from a material supply source on the conveying route; and a step of cutting the material into electromagnetic steel sheets of predetermined dimensions.

The figure which shows 1st Embodiment and shows roughly the whole structure of a manufacturing apparatus. A perspective view schematically showing the configuration of the fine magnetic domain processing device and the cutting mechanism part Enlarged bottom view of the machined surface of the press die A perspective view showing a second embodiment, schematically showing the configuration of a fine magnetic domain processing device and a cutting mechanism. A perspective view showing a third embodiment and schematically showing the configuration of a fine magnetic domain processing device and a cutting mechanism. A perspective view showing a fourth embodiment and schematically showing the configuration of a fine magnetic domain processing device and a cutting mechanism. A perspective view showing a fifth embodiment and schematically showing the configuration of a fine magnetic domain processing device and a cutting mechanism. Enlarged perspective view of fine magnetic domain processing part of hoop material Perspective view of the fine magnetic domain processing device, showing the sixth embodiment. This shows the seventh embodiment, and is a perspective view of the fine magnetic domain processing device part. This shows the eighth embodiment, and is a perspective view of the fine magnetic domain processing device part.

Hereinafter, several embodiments applied to manufacture of wound cores for transformers as static induction devices will be described with reference to the drawings. Parts common to a plurality of embodiments are denoted by the same reference numerals, and new illustrations and repetitive descriptions are omitted.

(1) First Embodiment Hereinafter, a first embodiment will be described with reference to FIGS. 1 to 3. FIG. First, the wound core 1 manufactured by the wound core manufacturing apparatus and manufacturing method according to the present embodiment will be briefly described. As partially shown in an inclined state in FIG. 1, this wound core 1 has two legs 2, 2 extending in the vertical direction, and the upper ends of the legs 2, 2 and the lower ends of the legs 2, 2 connected to the left and right. It has yoke portions 3, 3 and is configured in a rectangular annular shape with rounded corners. A winding (not shown) is attached to each of the legs 2, 2 to form a transformer.

This wound core 1 is of a so-called one-turn cut type. That is, the wound iron core 1 is formed by cutting a band-shaped hoop material such as a silicon steel plate into a required size for each turn to form the magnetic steel plates 5, and the ends of the magnetic steel plates 5 are butted against each other. It is constructed by winding a plurality of sheets in the inner and outer peripheral directions while providing a joint portion 6 . A grain-oriented magnetic steel sheet is used for the magnetic steel sheet 5, and the longitudinal direction, that is, the winding direction is the rolling direction. The joint portion 6 is configured to come to a substantially central portion of the lower yoke portion 3 . At this time, the joint portion 6 for each turn is laminated while being lapped while being shifted stepwise at a constant pitch in the winding direction (radial direction) of the electromagnetic steel sheet 5 . The joints 6 are sequentially shifted leftward 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 front end surface of each electromagnetic steel sheet 5 that overlaps the joint portion 6 of the other electromagnetic steel sheet 5. A fine magnetic domain processing unit 7 is provided in which the processing of . As shown by mesh lines in FIG. 2 for the sake of convenience, the fine magnetic domain processing portion 7 extends over the entire width direction of the electromagnetic steel sheet 5 within a certain range, e.g. It is provided in the range of about twice the length dimension. This range is a range in which the magnetic flux passes over another overlapping electromagnetic steel sheet 5 on the end surface of the electromagnetic steel sheet 5 .

Here, a manufacturing apparatus 11 according to the present embodiment for manufacturing the wound core 1 will be described below. FIG. 1 schematically shows the overall configuration of a manufacturing apparatus 11 according to this embodiment. This manufacturing apparatus 11 can be roughly divided into a conveying mechanism 13 for conveying a hoop material 12 to be the electromagnetic steel sheet 5, and a fine magnetic domain processing mechanism for performing fine magnetic domain processing on a portion of the hoop material 12 that will be the cut end of the electromagnetic steel sheet 5. A device 14 , a cutting mechanism 15 for cutting the hoop material 12 into the electromagnetic steel sheets 5 of a predetermined size, and a winding mechanism 16 for winding the cut electromagnetic steel sheets 5 to form the wound core 1 . Each mechanism of the manufacturing apparatus 11 is controlled by a control device (not shown) such as a computer.

The conveying mechanism 13 sequentially conveys the hoop material 12 in the direction of arrow A along a conveying path 18 from a supply source 17 in which a long roll of hoop material 12 is set to a winding mechanism 16. It is something to do. As schematically shown in FIG. 1, the conveying mechanism 13 includes a first conveying roller 19 that pulls out the hoop material 12 from a supply source 17 and feeds it to the fine magnetic domain processing device 14 side, and a hoop material 12 that has passed through the cutting mechanism 15 (electromagnetic It is provided with second transport rollers 20 for transporting 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 downstream of the first conveying roller 19 in the middle of the conveying path 18, and in this embodiment, performs fine magnetic domain processing on the surface of the hoop material 12 by a heat press device. is configured as 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 die 23 attached to the lower surface of the ram 22. The coining process is performed on the hoop material 12 while the press die 23 is heated.

In this case, as shown in FIG. 3, the surface of the press die 23 is provided with a large number of needle-like projections 23a over the entire surface. By the coining process in the fine magnetic domain processing device 14, thermal stress and mechanical stress are applied to a predetermined range of the surface of the hoop material 12, and countless fine imprints are made by the projections 23a. As a result, the surface of the hoop material 12 is provided with fine magnetic domain processed portions 7, and it is known that the magnetic resistance is reduced in the fine magnetic domain processed portions 7. FIG.

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 cuts the tip of the hoop material 12 conveyed on the conveying path 18. , and cut into a predetermined length to obtain an electromagnetic steel sheet 5 having a length dimension corresponding to 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 processed portion 7, and the fine magnetic domain processed portion 7 is located at the front end portion of the electromagnetic steel plate 5 to be cut next. It is designed to be 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.

Next, a procedure for manufacturing the wound core 1 in the manufacturing apparatus 11 configured as described above will be described. In the manufacturing apparatus 11 for the wound core 1 having the above configuration, the hoop material 12 is sequentially transported in the arrow A direction along the transport path 18 from the supply source 17 of the hoop material 12 by the transport mechanism 13 . Then, in the middle of the conveying path 18, the fine magnetic domain processing device 14 performs fine magnetic domain processing on the portion of the hoop material 12 that will be the cut end portion of the electromagnetic steel plate 5, thereby forming the fine magnetic domain processed portion 7. (fine magnetic domain processing step). After that, the hoop material 12 fed along the transport path 18 is cut by the cutting mechanism 15 into the electromagnetic steel sheets 5 having a predetermined size (cutting step).

As a result, the magnetic steel sheet 5 having the fine magnetic domain processing portion 7 provided in a predetermined range of the tip portion is obtained. Thereafter, the magnetic steel sheet 5 is wound by the winding mechanism 16 to obtain the wound core 1 . In this case, in the manufacturing apparatus 11, while the hoop material 12 is being conveyed on the conveying path 18, the hoop material 12 is subjected to fine magnetic domain processing at required positions, and cut as it is to form the electromagnetic steel sheets 5 of a predetermined size. and sent to the winding mechanism 16. At this time, the electromagnetic steel sheet 5 sent to the winding mechanism 16 is cut to a predetermined size, and the fine magnetic domain processed portions 7 are provided at the cut ends.

As described above, according to this 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. , a fine magnetic domain processing step of performing fine magnetic domain processing on a portion that will be the cut end of the electromagnetic steel plate 5 in the middle of the conveying path 18, and a cutting step of cutting the hoop material 12 into the electromagnetic steel plate 5 of a predetermined size. . Therefore, the series of processes from sending out the hoop material 12 to winding the wound core 1 can include subjecting the magnetic steel sheet 5 to fine magnetic domain processing for reducing loss, which is efficient. The excellent effect of making it possible to manufacture is exhibited.

In particular, in this embodiment, the cutting mechanism 15 is configured to perform cutting at the end of the fine magnetic domain processing portion 7 of the hoop material 12 downstream of the fine magnetic domain processing device 14 . As a result, the hoop material 12 is subjected to fine magnetic domain processing by the fine magnetic domain processing device 14 and then cut by the cutting mechanism 15 . Therefore, fine magnetic domain processing and cutting processing can be performed reliably. Further, in this 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 heat press device. As a result, fine magnetic domain processing can be performed by pressing the press die 23 in a heated state against the surface of the hoop material 12, and the fine magnetic domain processing unit 7 can be formed with a relatively simple configuration and requires simple processing. can be formed.

(2) Second and Third Embodiments FIG. 4 shows a second embodiment. The wound core manufacturing apparatus of the second embodiment differs from the manufacturing apparatus 11 of the first embodiment in the following configuration. That is, in this embodiment, a fine magnetic domain processing device 31, which is also a hot press device, is provided downstream of the first conveying roller 19 in the middle of the conveying path 18. As shown in FIG. This fine magnetic domain processing apparatus 31 is provided with a press die 32 having a large number of projections. It has a double dimension in the direction or longitudinal direction. By this fine magnetic domain processing device 31, fine magnetic domain processing portions 33 are provided on the surface of the hoop material 12 in a range twice as large as that of the first embodiment in the longitudinal direction.

In this embodiment, the cutting mechanism 15 is provided downstream of the fine magnetic domain processing device 31. This 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 perform cutting in the middle portion of the processing range. According to this, cutting is performed by the cutting mechanism 15 in the intermediate portion of the hoop material 12 processed by the fine magnetic domain processing device 31 . Therefore, both the terminal end portion of the electromagnetic steel sheet 5 to be separated from the hoop member 12 and the tip portion of the electromagnetic steel plate 5 to be separated from the hoop member 12 next are subjected to fine magnetic domain processing by one processing operation. will be

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

FIG. 5 shows a third embodiment. The wound core manufacturing apparatus of the third embodiment differs from the manufacturing apparatus 11 of the first embodiment in that a fine magnetic domain processing apparatus 41 and a cutting mechanism are so to speak integrated. That is, the fine magnetic domain processing device 41 is also composed of a hot press device, and includes a bed 42 which also serves as a die of a cutting device, a ram 43 which moves up and down with respect to the bed 42, and a press die 23 attached to the lower surface of the ram 43. and a cutting edge 44 attached to the forward surface of the side surface of the ram 43 in the conveying direction.

As a result, the hoop material 12 conveyed on the conveying path 18 is subjected to coining processing in the fine magnetic domain processing device 41 by lowering the ram 43 while the press die 23 is being heated. 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 processed portion 7 to become the electromagnetic steel plate 5 having the fine magnetic domain processed portion 7 at the tip portion, and the winding mechanism 16 . sent to A fine magnetic domain processed part 7 is positioned at the tip of the electromagnetic steel sheet 5 to be cut next. In this way, the fine magnetic domain machining by the fine magnetic domain machining device 41 and the cutting by the cutting mechanism for the hoop material 12 are collectively performed at the same timing.

According to such a third embodiment, as in the first embodiment, during a series of steps from sending out the hoop material 12 to winding as the wound core 1, the loss is reduced. The magnetic steel sheet 5 can be subjected to the fine magnetic domain processing of (1), and an excellent effect can be obtained that efficient manufacturing can be performed. Further, in the present embodiment, the fine magnetic domain processing for the hoop material 12 and the cutting processing for the electromagnetic steel sheet 5 by the cutting mechanism can be collectively performed, so that more efficient manufacturing work can be performed. Another advantage is that the cutting position of the hoop material 12 with respect to the fine magnetic domain processed portion 7 is less likely to be misaligned.

(3) Fourth to Sixth Embodiments FIG. 6 shows a fourth embodiment. That is, in this embodiment, instead of the fine magnetic domain processing device 14 comprising a hot press 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 device 51 is equipped with a scanning device comprising a laser oscillator, a galvano mirror, etc., and the surface of the hoop material 12 is subjected to continuous linear laser irradiation processing. It is constructed such that a large number of lines are provided in a grid pattern in two crossing directions, that is, in the X and Y directions.

Due to the laser irradiation processing by the fine magnetic domain processing device 51 , grid-like linear scratches are formed on the surface of the hoop material 12 , and the formation range of the linear scratches becomes the fine magnetic domain processing portion 52 . This fine magnetic domain processed portion 52 is obtained by finely dividing the magnetic domain on the surface of the hoop material 12, and can reduce the magnetic resistance in this portion. In addition, the interval at which the linear scratches are formed by the laser irradiation treatment is, for example, 2.0 mm or less both in length and breadth. More preferably, it is 0.5 mm or less. The linear scratches may be provided in a form that is oblique to the rolling direction of the hoop material 12, that is, the longitudinal direction.

According to such a fourth embodiment, as in the first embodiment, during a series of steps from sending out the hoop material 12 to winding as the wound core 1, the loss is reduced. The magnetic steel sheet 5 can be subjected to the fine magnetic domain processing of (1), and an excellent effect can be obtained that efficient manufacturing can be performed. In this embodiment, the fine magnetic domain machining device 51 can reliably perform fine magnetic domain machining by irradiating the surface of the hoop material 12 with a laser, and highly reliable processing can be performed.

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 device 51, the back surface of the hoop material 12, that is, the bottom surface in the figure, is irradiated with a laser. It has a configuration in which a fine magnetic domain processing device 53 for performing finer magnetic domain processing is provided. As a result, a fine magnetic domain processed portion 52 is formed on the surface of the hoop material 12 by the fine magnetic domain processing device 51, and a fine magnetic domain processed portion 54 is formed on the back surface of the hoop material 12 by the fine magnetic domain processing device 53 (see FIG. 8). is formed.

At this time, as shown in FIG. 8, the fine magnetic domain processing section 52 and the fine magnetic domain processing section 54 are provided within a predetermined length range of the hoop material 12, but are shifted from each other 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, due to thermal expansion and thermal contraction of the hoop material 12 on the side irradiated with the laser, the hoop material 12 has a convex shape on the side opposite to the laser irradiation surface. There are circumstances in which warping and distortion occur. However, in this embodiment, as shown in FIG. 8, the laser irradiation process can be performed while the thermal strain of the hoop material 12 is canceled out on both sides, and the dimensional accuracy is lowered due to warping and distortion. It is possible to solve problems such as

Therefore, according to the fifth embodiment, similarly to the fourth embodiment, during a series of steps from feeding the hoop material 12 to winding as the wound core 1, the loss is reduced. The magnetic steel sheet 5 can be subjected to the fine magnetic domain processing of (1), and an excellent effect can be obtained that efficient manufacturing can be performed. Further, the fine magnetic domain machining apparatuses 51 and 53 can reliably carry out fine magnetic domain machining by irradiating the hoop material 12 with laser beams, and highly reliable processing can be performed. Furthermore, it is possible to suppress the occurrence of thermal strain in the hoop material 12 due to laser irradiation. In addition, since fine magnetic domain processing is performed on both sides of the end portion of the electromagnetic steel sheet 5, the magnetic resistance at the joint portion when the wound core 1 is formed can be further reduced, which is more effective in reducing loss. .

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

Therefore, according to the sixth embodiment, similarly to the fourth embodiment, during a series of steps from feeding the hoop material 12 to winding as the wound core 1, the loss is reduced. The magnetic steel sheet 5 can be subjected to the fine magnetic domain processing of (1), and an excellent effect can be obtained that efficient manufacturing can be performed. In addition, the fine magnetic domain machining device 51 can reliably carry out fine magnetic domain machining by irradiating the hoop material 12 with a laser beam, and highly reliable processing can be performed. Furthermore, since the laser irradiation is performed while the thermal distortion of the hoop material 12 is corrected by the correction roller 55, the thermal distortion of the hoop material 12 and the accompanying adverse effects can be effectively prevented.

(4) Seventh and Eighth Embodiments and Other Embodiments FIG. 10 shows a seventh embodiment. In this seventh embodiment, the configuration of the fine magnetic domain processing device 61 is different from that in the first embodiment. That is, the fine magnetic domain processing device 61 includes a cradle 62 for receiving the lower surface of the hoop material 12, a needle-like tool 63 provided above it, and a drive mechanism (not shown) for moving the needle-like tool 63 back and forth and left and right. and The needle-like tool 63 is constructed by attaching a plurality of cutting tools 63b, called scribe needles, to the lower surface of a horizontally long handle 63a.

In this fine magnetic domain machining device 61, a needle-like tool 63 is repeatedly moved back and forth in the vertical and horizontal directions, that is, in the directions of arrows B and C by means of a drive mechanism while the cutting tool 63b is pressed against the surface of the hoop material 12. A plurality of bites 63b are used to form a large number of scratches extending in the vertical and horizontal directions on a predetermined region of the surface of the material 12. As shown in FIG. As a result, the fine magnetic domain processed portions 64 are formed on the surface of the hoop material 12 .

According to such a seventh embodiment, as in the first embodiment, during a series of steps from sending out the hoop material 12 to winding as the wound core 1, the loss is reduced. The magnetic steel sheet 5 can be subjected to the fine magnetic domain processing of (1), and an excellent effect can be obtained that efficient manufacturing can be performed. In the present embodiment, fine magnetic domain processing can be mechanically performed by a relatively simple process of scratching the surface of the hoop material 12 while moving the needle-shaped tool 63 . It is also possible to prevent the hoop material 12 from being warped due to thermal strain.

FIG. 11 shows an eighth embodiment, which differs from the first embodiment and the like in the configuration of a fine magnetic domain processing device 71. As shown in FIG. That is, the fine magnetic domain machining device 71 comprises a table 72 for receiving the lower surface of the hoop material 12, and two cutter rollers 73 and 74 arranged above the table 72 in the forward and rearward directions in the conveying 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 rotating shaft extending horizontally in a direction orthogonal to the conveying direction of the hoop material 12. . These cutter rollers 73 and 74 are lowered and pressed against the position where the fine magnetic domain processing on the surface of the hoop material 12 is to be performed.

A plurality of blade portions 73a and 74a are provided on the outer peripheral surfaces of the cutter rollers 73 and 74, respectively, extending in an oblique direction with respect to the axial direction. At this time, the blade portion 73a and the blade portion 74a are inclined in opposite directions with respect to the axial direction. The blade portions 73a and 74a may be spirally provided. 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 transported in the direction of arrow A. Rollers 73 and 74 are rotated in the arrow D direction. As a result, the blades 73a and 74a of the cutter rollers 73 and 74 scratch the surface of the hoop material 12 in a mesh-like manner like a combination of a large number of rhombuses, forming fine magnetic domain processed portions 75. .

According to such an eighth embodiment, as in the first embodiment, during a series of steps from sending out the hoop material 12 to winding as the wound core 1, the loss is reduced. The magnetic steel sheet 5 can be subjected to the fine magnetic domain processing of (1), and an excellent effect can be obtained that efficient manufacturing can be performed. In the present embodiment, the surface of the hoop material 12 can be subjected to mechanical fine magnetic domain processing by relatively simple processing such as making numerous scratches on the surface of the hoop material 12 with the cutter rollers 73 and 74 . 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 coining processing or laser irradiation processing on the surface of the hoop material. 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 forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

In the drawings, 1 is a wound iron core, 5 is an electromagnetic steel sheet, 6 is a joint portion, 7, 33, 52, 54, 64, and 75 are fine magnetic domain processing units, 11 is a manufacturing device, 12 is a hoop material, and 13 is a conveying 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 conveying path, 23 and 32 are press dies, 25, 44 is a cutting blade, 55 is a correction roller, 63 is a needle-like tool, and 73 and 74 are cutter rollers.

Claims (11)

A device for manufacturing a wound iron core for a stationary induction device by winding a plurality of electromagnetic steel sheets cut to a predetermined size from a hoop material,
a conveying mechanism for sequentially conveying the hoop material of the magnetic steel sheet from the supply source of the hoop material along a conveying path;
a fine magnetic domain processing device provided in the middle of the conveying path for performing fine magnetic domain processing on a portion of the hoop material that will be the cut end portion of the electromagnetic steel sheet;
a cutting mechanism provided in the middle of the conveying path for cutting the hoop material into an electromagnetic steel sheet of a predetermined size;
A winding mechanism for winding the electromagnetic steel sheets cut by the cutting mechanism. The fine magnetic domain processing device performs fine magnetic domain processing on a predetermined range in the middle of the conveyed hoop material,
2. The manufacturing of the wound iron core according to claim 1, wherein the cutting mechanism is configured to cut the hoop material at an end portion of a processing range of the hoop material by the fine magnetic domain processing device downstream of the fine magnetic domain processing device. Device. The fine magnetic domain processing device performs fine magnetic domain processing on a predetermined range in the middle of the conveyed hoop material,
2. The apparatus for manufacturing a wound iron core according to claim 1, wherein the cutting mechanism is configured to cut the hoop material in an intermediate portion of a processing range of the fine magnetic domain processing device downstream of the fine magnetic domain processing device. . 2. The apparatus for manufacturing a wound core according to claim 1, wherein the fine magnetic domain machining by the fine magnetic domain machining device and the cutting by the cutting mechanism for the hoop material are collectively performed at the same timing. The apparatus for manufacturing a wound 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 wound core manufacturing apparatus according to any one of claims 1 to 4, wherein the fine magnetic domain processing device is configured to perform fine magnetic domain processing by irradiating the surface of the hoop material with a laser. 7. The apparatus for manufacturing a wound core according to claim 6, wherein the laser irradiation is performed in a state in which positions are shifted with respect to both surfaces of the hoop material. 7. The apparatus for manufacturing a wound core according to claim 6, wherein said laser irradiation is performed while correcting thermal distortion of said hoop material with a correcting roller. The apparatus for manufacturing a wound core according to any one of claims 1 to 4, wherein the fine magnetic domain processing device is configured to apply a large number of scratches to the surface of the hoop material with a needle-like tool. The apparatus for manufacturing a wound core according to any one of claims 1 to 4, wherein the fine magnetic domain processing device is configured to apply a large number of scratches to the surface of the hoop material with a cutter roller. A method for manufacturing a wound iron core for a stationary induction device by winding a plurality of electromagnetic steel sheets cut to a predetermined size from a hoop material, comprising:
Fine magnetic domain processing for performing fine magnetic domain processing on a portion to be a cut end portion of the electromagnetic steel sheet in the middle of the conveying path while sequentially conveying the hoop material on the conveying path from the supply source of the hoop material of the electromagnetic steel sheet. process and
and a cutting step of cutting the hoop material into an electromagnetic steel sheet of a predetermined size.

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