Device and method for manufacturing teeth of stator core for axial gap motor

Abstract

[Problem] To manufacture, with a simple configuration, teeth in which a plurality of types of core pieces each having a different shape are stacked, in a stator core for an axial gap motor. [Solution] A tooth manufacturing device 30 is provided with a plurality of stations S101-S105 in which processing to a portion corresponding to each core piece 10 is performed on a belt-shaped steel plate W. The stations S101-S105 include: temporary punching stations S103-1 to S103-n; and an outer shape punching station S105 for punching and stacking a rough core piece 170 including at least each temporarily punched core piece 10. The temporary punching stations S103-1 to S103-n include: temporary punching punches S121-1 to S121-n and temporary punching dies S122-1 to S122-n; and temporary punching receiving bases S123-1 to S123-n for pushing back each punched or half-punched core piece 10.

Description

Manufacturing device and manufacturing method for teeth of stator core for axial gap motor

[0001] The present invention relates to a manufacturing device and a manufacturing method for teeth of a stator core for an axial gap motor, the teeth being configured as a laminated core including a plurality of core pieces.

[0002] Axial gap motors are known to be thinner and produce higher torque than radial gap motors. However, the stator core of an axial gap motor has a yoke and multiple teeth extending axially from the yoke, resulting in a more complex shape than that of a radial gap motor. To achieve such complex shapes, dust cores, which are made by molding soft magnetic iron powder into the desired three-dimensional shape using a mold, have become widespread.

[0003] Meanwhile, there is a technology for configuring the teeth of a stator core for an axial gap motor as a laminated core. For example, in an armature including an armature core (corresponding to the teeth), a yoke, and an armature winding, the armature core includes a rectangular column portion around which the armature winding is wound and a first rectangular parallelepiped portion embedded in a recess in the yoke, and is configured from multiple magnetic plates (corresponding to core pieces) made of electromagnetic steel sheets laminated along a direction perpendicular to the rotation axis (see Patent Document 1).

[0004] Patent No. 5458522

[0005] In the prior art disclosed in the above-mentioned Patent Document 1, since the width of the rectangular column portion gradually increases along the stacking direction, it is necessary to punch out the multiple magnetic plates in different shapes (here, widths). Therefore, in the die for punching out the multiple first magnetic plates, punching is performed while changing the width of the portion punching out the target portion of the rectangular column portion. The armature core is formed by stacking the multiple magnetic plates punched out in this manner.

[0006] On the other hand, in the above-mentioned conventional technology, the target portion of the rectangular column portion is punched while changing the width of the punched portion, which requires displacing the target portion of the mold, resulting in a complex mold configuration.

[0007] In view of the above background, the present invention relates to the manufacture of stator cores for axial gap motors, and aims to provide an apparatus and method for manufacturing teeth of stator cores for axial gap motors that can manufacture teeth in which multiple types of core pieces, each with a different shape, are stacked using a simple configuration.

[0008] In order to solve the above-mentioned problems, one aspect of the present invention is a manufacturing device for teeth of a stator core for an axial gap motor, wherein the teeth are configured as laminated cores including a plurality of core pieces stacked in the radial direction of the stator core, the plurality of core pieces include a plurality of types of core pieces each having a different width in the circumferential direction of the stator core, and are arranged so that the circumferential width of at least a part of the teeth gradually increases toward the outside in the radial direction, and the manufacturing device is provided with a plurality of stations where processing is performed on portions corresponding to each of the core pieces on a strip-shaped steel plate that is intermittently transported in a predetermined transport direction, and the plurality of stations The system includes a plurality of pre-punching stations that punch or half-punch the outer shape of each core piece according to the type of each core piece and then push it back, and an outline punching station that punches out rough core pieces including at least each of the pushed-back core pieces to separate each of the rough core pieces from the strip steel plate and stacks the separated rough core pieces, and each of the pre-punching stations includes a pair of pre-punching punch and pre-punching die that punch or half-punch the outer shapes of the plurality of core pieces according to the type, and a pre-punching receiving stand that is arranged in the outline punching die and pushes back each of the punched or half-punched core pieces.

[0009] According to this aspect, in the manufacture of stator cores for axial gap motors, the outer shapes of multiple types of core pieces, each with a different shape, are pre-punched at multiple pre-punching stations where the outer shape of each core piece is punched or half-punched and then pushed back, making it possible to manufacture teeth in which multiple types of core pieces, each with a different shape, are stacked using a simple configuration.

[0010] In the above aspect, the rough core pieces include each of the pushed-back core pieces and scrap pieces surrounding each of the core pieces, and the outer shape punching station includes a pair of outer shape punching punch and outer shape punching die for punching out the outer shape of each of the rough core pieces, and a squeeze ring connected to the outer shape punching die, and the squeeze ring has through holes formed therein for holding the multiple rough core pieces from which the outer shapes have been punched out in a stacked state.

[0011] According to this aspect, it is possible to stably fix a plurality of types of core pieces each having a different shape in the through-hole of the squeeze ring (that is, to integrate them as a laminated core).

[0012] In the above aspect, the multiple stations include a temporary cutting station that forms at least one cut portion in the strip steel plate from the outer edge of a portion corresponding to each scrap piece to the outer edge of a portion corresponding to each core piece, and the contour punching station preferably includes a temporary cutting punch and a temporary cutting die that punch or half-punch the cut portion, and a temporary cutting support that is positioned within the temporary cutting die and pushes back each of the punched or half-punched core pieces.

[0013] According to this aspect, it is possible to easily obtain teeth (i.e., a stack of multiple core pieces) from a stack of multiple rough core pieces that are fixed together (i.e., integrated as a laminated core).

[0014] In the above-mentioned aspect, the multiple stations include an adhesive application station that applies adhesive to at least one side of the strip steel plate, and the adhesive application station may be provided with an adhesive application device that applies adhesive to at least the portions of the strip steel plate corresponding to each core piece.

[0015] According to this aspect, it is possible to fix a plurality of core pieces of the laminated body (that is, to integrate them as a laminated core).

[0016] In the above aspect, the adhesive application device may be configured to change the amount of adhesive applied to the portion corresponding to each core piece depending on the type of each core piece punched out of the strip steel plate.

[0017] According to this aspect, it is possible to more stably fix a plurality of types of core pieces each having a different shape in a stacked state.

[0018] In the above aspect, the adhesive application device may be configured to change the application position of the adhesive relative to the portion corresponding to each core piece depending on the type of each core piece punched out of the strip steel plate.

[0019] According to this aspect, it is possible to more stably fix a plurality of types of core pieces each having a different shape in a stacked state.

[0020] In the above aspect, among the plurality of stations, the adhesive application station may be the station immediately preceding the outline punching station.

[0021] According to this aspect, it is possible to apply adhesive to the steel strip without interfering with the processing of the portions corresponding to the core pieces in the other stations.

[0022] In the above aspect, the strip steel plate includes an electromagnetic steel plate having a coating pre-formed on at least one surface, and the coating preferably exhibits adhesive properties that allow the multiple core pieces in a stacked state to be fixed together by heating and pressurizing.

[0023] According to this aspect, there is no need to apply adhesive to the steel strip in the manufacturing device, so that the manufacturing device can be realized with a simple configuration.

[0024] In order to solve the above problem, one aspect of the present invention is a method for manufacturing teeth of a stator core for an axial gap motor, wherein the teeth are configured as a laminated core including a plurality of core pieces stacked radially of the stator core, the plurality of core pieces include a plurality of types of core pieces each having a different width in the circumferential direction of the stator core, and are arranged so that the circumferential width of at least a portion of the teeth gradually increases radially outward, and a strip-shaped steel plate is intermittently transported in a predetermined transport direction, the outer shape of each core piece is punched or half-punched according to the type of each core piece, and then pushed back, and rough core pieces including at least each of the pushed-back core pieces are punched out to separate each of the rough core pieces from the strip-shaped steel plate, and the separated rough core pieces are stacked, and scrap pieces surrounding each of the stacked rough core pieces are removed from each of the core pieces.

[0025] According to this aspect, in the manufacture of stator cores for axial gap motors, the outer shapes of multiple types of core pieces, each with a different shape, are pre-punched at multiple pre-punching stations where the outer shape of each core piece is punched or half-punched and then pushed back, making it possible to manufacture teeth in which multiple types of core pieces, each with a different shape, are stacked using a simple configuration.

[0026] According to the above aspect, in manufacturing a stator core for an axial gap motor, teeth in which a plurality of types of core pieces each having a different shape are stacked can be manufactured with a simple configuration.

[0027] 1 is a perspective view of a stator core for an axial gap motor according to the first embodiment; FIG. 2 is an explanatory diagram showing a strip layout of a progressive die used to manufacture teeth in the stator core shown in FIG. 1; FIG. 3 is a schematic diagram showing the configuration of station S3-1 (an example of a side edge punching station) in the progressive die according to the first embodiment; FIG. 4 is an explanatory diagram showing an example of a change in the amount of adhesive applied to each core piece according to the first embodiment; FIG. 5 is an explanatory diagram showing an example of a change in the position where adhesive is applied to each core piece according to the first embodiment; 10 is a schematic diagram showing the configuration of station S3 (an example of a side edge punching station) in the progressive die according to the second embodiment; FIG. 11 is a perspective view of a stator core for an axial gap motor according to the third embodiment; FIG. 12 is a schematic diagram showing the strip layout of the progressive die used to manufacture teeth in the stator core shown in FIG. 10; FIG. 13 is a plan view of the squeeze ring shown in FIG. 12; and FIG. 14 is a schematic diagram showing a method of obtaining a core piece stack (teeth) from a rough core piece stack manufactured by the progressive die shown in FIG.

[0028] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0029] 1, a stator core 1 for an axial gap motor according to the first embodiment includes a plurality of teeth 2, a yoke 3, and a plurality of coils 4 wound around the outer circumferential surfaces of the teeth 2. For convenience, only one coil 4 is shown in FIG.

[0030] The multiple (here, eight) teeth 2 have approximately the same configuration and are arranged at a predetermined interval in the circumferential direction so as to surround the axis X of the stator core 1 (i.e., the rotation axis of the axial gap motor).

[0031] Each tooth 2 is configured as a laminated core. That is, each tooth 2 includes a plurality of core pieces 10 stacked radially of the stator core 1. Each core piece 10 is configured from a thin plate piece made of electromagnetic steel sheet. Each tooth 2 also has a tooth body 12 around which the coil 4 is wound, and an attachment portion 13 connected to one end of the tooth body 12 (the lower end in FIG. 1 ).

[0032] The multiple core pieces 10 include multiple types of core pieces 10. The multiple types of core pieces 10 differ from each other in width at least in part (more specifically, the width in the circumferential direction of the stator core 1 of the body pieces 25 that make up the tooth body 12). The multiple core pieces 10 that make up the tooth 2 include multiple core pieces 10 of the same type. However, the tooth 2 may be made up of core pieces 10 that are all different types.

[0033] In addition, the "circumferential direction" with respect to the width of the teeth 2 and the core pieces 10, more strictly, indicates the direction of a tangent passing through a corresponding point on an imaginary circle extending circumferentially with a point on the axis X of the stator core 1 as its center.

[0034] The tooth bodies 12 have a shape obtained by deforming a portion of a rectangular parallelepiped. More specifically, when viewed radially outward from the center of the stator core 1, the tooth bodies 12 are configured so that the circumferential width of the inner main portion 14 located radially inward (toward the axis X) gradually increases radially outward. Furthermore, the tooth bodies 12 are configured so that the circumferential width of the outer end portions 16 located radially outward (i.e., the portion continuing radially outward from the inner main portion 14) gradually decreases radially outward.

[0035] Such a shape of the tooth body 12 can be realized by appropriately determining the order of arrangement (i.e., stacking) of the multiple types of core pieces 10. That is, some of the multiple types of core pieces 10 are arranged so that their circumferential widths gradually increase radially outward at the inner main portion 14 of the tooth body 12. Also, some of the multiple types of core pieces 10 are arranged so that their circumferential widths gradually decrease radially outward at the outer end portion 16 of the tooth body 12.

[0036] However, the outer peripheral end portion 16 of the tooth body 12 may be omitted. In other words, the entire tooth body 12 may be provided so that the width gradually increases radially outward.

[0037] The left side surface 12A and the right side surface 12B located in the circumferential direction of the tooth body 12 are each formed as a generally flat surface at the inner main portion 14. Furthermore, the left side surface 12A and the right side surface 12B are each formed as a generally curved surface (arcuate surface) at the outer end portion 16. However, more strictly speaking, the left side surface 12A and the right side surface 12B each include a slight step due to a change in the circumferential width of the core piece 10.

[0038] The teeth 2 may be formed from fewer types of core pieces 10 than those shown in Fig. 1. This makes it easier to manufacture the core pieces 10 that form the teeth 2. On the other hand, when fewer types of core pieces 10 are used, the left side surface 12A and the right side surface 12B of the tooth body 12 will include larger steps (i.e., stepped portions).

[0039] The upper surface 12C and the lower surface 13D of the tooth body 12 form a plane that is generally perpendicular to the axis X of the stator core 1. However, the upper surface 12C (i.e., an example of an end surface of the tooth 2) is provided with a concave groove 15 that extends in the radial direction. When viewed from the center of the stator core 1, the groove 15 is located approximately in the center of the tooth body 12 in the left-right direction (i.e., the circumferential direction).

[0040] The attachment portions 13 are generally rectangular parallelepiped-shaped. Unlike the tooth bodies 12, the attachment portions 13 have a constant width throughout the radial direction when viewed from the center of the stator core 1 (i.e., their circumferential width does not change). The radial length of the attachment portions 13 is the same as the radial length of the tooth bodies 12. Furthermore, the axial length and circumferential width of the attachment portions 13 are smaller than the axial length and circumferential width of the tooth bodies 12, respectively.

[0041] The left side surface 13A and the right side surface 13B of the mounting portion 13 are arranged parallel to each other. The lower surface 13D of the mounting portion 13 (i.e., the lower surface of the tooth 2) forms a plane that is generally perpendicular to the axis X of the stator core 1. However, the lower surface 13D (an example of an end surface of the tooth 2) is provided with a groove 17 that is concave and extends radially. When viewed from the center of the stator core 1, the groove 17 is located approximately in the center of the mounting portion 13 in the left-right direction (i.e., the circumferential direction).

[0042] Similar to the tooth main body 12, the attachment portions 13 may be provided so that their circumferential widths gradually increase radially outward when viewed from the center of the stator core 1. The radial length of the attachment portions 13 may be different from the radial length of the tooth main body 12.

[0043] The yoke 3 is generally disk-shaped. In plan view (i.e., when viewed axially of the stator core 1), a circular opening 20 is formed in the center of the yoke 3. The yoke 3 also has a plurality of mounting holes 21 formed therein, arranged at predetermined intervals in the circumferential direction so as to surround the opening 20. Each mounting hole 21 is generally rectangular and is provided so that the mounting portion 13 of the corresponding tooth 2 can be fitted into (i.e., fixed to) the mounting hole 21. However, instead of the mounting holes 21, the yoke 3 may be provided with recesses into which the mounting portions 13 of the corresponding teeth 2 can be fitted.

[0044] The yoke 3 may be configured as a laminated core, similar to the teeth 2. In this case, the yoke 3 is made of electromagnetic steel sheets and includes multiple disk-shaped thin plates stacked in the axial direction. However, the yoke 3 may also be configured as a powder core by compressing soft magnetic iron powder under high pressure.

[0045] Each core lamination 10 has a main body piece 25 and a fixing piece 26 connected to one end (the lower part in FIG. 1 ) of the main body piece 25. The main body piece 25 and the fixing piece 26 respectively constitute the tooth body 12 and the mounting portion 13 of the tooth 2. When viewed from the center of the stator core 1, the main body piece 25 and the fixing piece 26 each have a substantially rectangular shape, except for the portions corresponding to the grooves 15 and 17 of the tooth 2 (hereinafter also referred to as grooves 15 and 17 in the core lamination 10).

[0046] Next, a manufacturing device and a manufacturing method for the teeth 2 of the stator core 1 for the axial gap motor according to the first embodiment will be described.

[0047] A progressive die 30 (see FIGS. 3 and 6) can be used as a manufacturing device for the teeth 2. The progressive die 30 sequentially processes portions corresponding to each core piece (thin plate piece) 10 while intermittently conveying a hoop material W (an example of a strip-shaped steel plate) made of electromagnetic steel plate in a progressive direction, thereby manufacturing the teeth 2 as laminated cores.

[0048] The progressive die 30 is provided with a plurality of stations S1-S5, which correspond to the steps (1)-(5) shown in Fig. 2 and in which processing is performed on the portions of the hoop material W corresponding to the core pieces 10. Note that the "processing" performed by the progressive die 30 is not limited to punching using a punch and die, but also includes processing (e.g., applying an adhesive) that does not change the shape of the hoop material W (or the portions corresponding to the core pieces 10).

[0049] 2, the manufacturing of the tooth 2 involves (1) punching a pilot hole, (2) punching the side edge of the fixing piece, (3-1) punching the side edge of the first body piece, (3-2) punching the side edge of the second body piece, ..., (3-n) punching the side edge of the nth body piece, (4) applying adhesive, and (5) punching the outer shape of the core piece. Note that the first to nth body pieces refer to body pieces 25 of the first to nth core pieces 10, which are different types.

[0050] In the first embodiment, as shown by the two-dot chain line in Fig. 2, the portions of the hoop material W that correspond to the core pieces 10 (hereinafter referred to as core piece corresponding portions) are arranged in a row along the conveying direction (i.e., the forward feed direction) of the hoop material W. Each core piece corresponding portion generally corresponds to an area inside the outer shape of each core piece 10 punched out from the hoop material W.

[0051] (1) In the pilot hole punching step (corresponding to station S1), a circular pilot hole P1 is punched near each of the two side edges of the hoop material W in the width direction (the left-right direction perpendicular to the conveying direction) using a pilot hole punch and a pilot hole punching die (not shown).

[0052] (2) In punching the side edges of the fixing piece (corresponding to station S2), a pair of rectangular punched holes P2 that define the left and right side edges of the fixing piece 26 in the core piece corresponding portion are punched out by a side edge punching punch and a side edge punching die (not shown). Note that the shape of each punched hole P2 can be modified in various ways as long as it is possible to define the left and right side edges of the fixing piece 26 in the core piece corresponding portion (i.e., to punch out the left and right side edges).

[0053] In (3-1) punching the side edge of the first body piece, (3-2) punching the side edge of the second body piece, ..., and (3-n) punching the side edge of the nth body piece (corresponding to stations S3-1 to S3-n: an example of multiple side edge punching stations), pairs of punched holes P3-1 to P3-n that define the side edges of the first to nth body pieces 25 of different types of first to nth core pieces 10 are punched, respectively (where n is an integer of 3 or more). Here, the first to nth core pieces 10 are set so that the circumferential widths described above gradually increase. In other words, the side edges (circumferential side edges in FIG. 1 ) of the first to nth core pieces 10 are punched at different positions in the width direction of the hoop material W in stations S3-1 to S3-n.

[0054] Only (3-1) punching the side edge of the first body piece (corresponding to station S3-1) is performed on the core piece corresponding portion of the first core piece 10. In other words, (3-2) punching the side edge of the second body piece to (3-n) punching the side edge of the nth body piece (corresponding to stations S3-2 to S3-n) are not performed on that core piece corresponding portion. Similarly, the core piece corresponding portion of the second core piece 10 and subsequent core piece corresponding portions are processed only at the corresponding stations.

[0055] 3, the progressive die 30 has a plate-shaped upper holder 35 fixed to the underside of an upper ram (not shown) of a press machine, and a plate-shaped lower holder 36 fixed to the upper surface of a lower table (not shown) of the press machine so as to face the upper holder 35. The upper holder 35 and the lower holder 36 and the parts attached thereto (including a punch and a die) respectively constitute an upper die and a lower die.

[0056] At station S3-1 (similarly at stations S3-2 to S3-n), two side edge punches 41 are attached to the lower part of the upper holder 35 by a backing plate 38 and a punch plate 39.

[0057] A stripper 43 is attached below the upper holder 35 by a hanging bolt (not shown) so as to be movable in the vertical direction. The stripper 43 is suspended by the hanging bolt (not shown) and is set to its lowest position relative to the upper holder 35. The stripper 43 is composed of an assembly of a plate-shaped stripper body 44 and a stripper plate 45. The lower surface of the stripper plate 45 faces the upper surfaces of a die plate 47 and two side edge punching dies 49 attached to the upper surface of the lower holder 36. The stripper 43 has holes formed therein through which two side edge punching punches 41 pass. The two side edge punching punches 41 and the two side edge punching dies 49 form a die set, and each punches a pair of punching holes P3-1.

[0058] The knockout 51 has a lower end that abuts against the upper part of the stripper body 44, a shaft portion that is fitted into a through-hole 55 formed in the upper holder 35 so as to be movable up and down, and an upper end flange that is located within a spring chamber 57 formed in the upper holder 35. The upper part of the spring chamber 57 is closed by a plug 59 fixed to the upper holder 35. A stripper spring 60, which is a compression coil spring, is provided between the plug 59 and the upper end flange. The stripper spring 60 urges the knockout 51 downward.

[0059] The lowermost position (bottom dead center position) of the upper holder 35 is a position where the lower surface of the upper holder 35 abuts against the upper surfaces of stoppers 62 provided on both the left and right sides of the lower holder 36 when the upper ram (not shown) of the press machine is at the bottom dead center. When the upper holder 35 is located at the lowermost position, the stripper plate 45 abuts against the hoop material W and presses the hoop material W against the upper surface of the die plate 47 in a state where it is displaced downward relative to the upper holder 35 with the compressive deformation of the stripper spring 60.

[0060] In the process of lifting the upper holder 35 after punching, after each side edge punching punch 41 has come out of each side edge punching die 49 and the hoop material W, the stripper 43 lifts up together with the upper holder 35, and the stripper 43 is released from pressing down on the hoop material W. As a result, the hoop material W remains pressed against the upper surface of the die plate 47 by the stripper 43 until each side edge punching punch 41 has come out of each side edge punching die 49.

[0061] Although not shown in Figure 3, the two side edge punching punches 41 can be equipped with a similar configuration to, for example, the cam mechanism 127-1 of the preliminary punching punch 121-1 shown in Figure 12 described later, thereby making it possible to process only the core piece corresponding portion of the corresponding first core piece 10.

[0062] (4) In adhesive application (corresponding to station S4: an example of an adhesive application station), adhesive is applied to the core piece corresponding portions of the hoop material W. Here, an example is shown in which adhesive is applied in spots to a plurality of application points E set in the core piece corresponding portions. Station S4, which applies adhesive, may be equipped with a device similar to adhesive application device 160 shown in FIG. 12, which will be described later. Station S4 may be provided immediately before station S5, which performs the outer shape punching.

[0063] Such an adhesive application device can change the amount of adhesive applied to the core piece corresponding portion depending on the type of core piece 10. More specifically, the adhesive application device can change the amount of adhesive applied depending on the area of ​​the core piece corresponding portion (i.e., the area of ​​the adhesive application region).

[0064] For example, as shown in Fig. 4(A), the adhesive application device can set the amount of adhesive to be applied at application points E1-E5 (here, the diameter of the circular adhesive) to be less than the standard amount for the first core piece 10 which is narrower (i.e., the area of ​​the adhesive application region is smaller). For example, the first core piece 10 corresponds to the core piece 10 located radially innermost in the inner main portion 14 of the tooth 2 shown in Fig. 1.

[0065] On the other hand, as shown in Fig. 4(B), the adhesive application device can set the amount of adhesive to be applied at application points E1-E5 to be larger than the standard amount for the wider nth core piece 10 (i.e., the area of ​​the adhesive application region is larger). For example, the nth core piece 10 corresponds to the core piece 10 located radially outermost in the inner main portion 14 of the tooth 2 shown in Fig. 1.

[0066] In addition, in the adhesive application device, the amount of adhesive to be applied can be set in stages depending on the area of ​​the core piece corresponding portion, even for intermediate core pieces 10 that are larger than the first core piece 10 but smaller than the nth core piece 10.

[0067] Furthermore, the adhesive application device can change the application position (or the number of application points) of the adhesive relative to the core piece corresponding portion depending on the type of core piece 10. More specifically, the adhesive application device can change the application position depending on the size of the core piece corresponding portion (i.e., the size of the adhesive application area).

[0068] For example, as shown in Figure 5 (A), for a first core piece 10 that is narrower (i.e., the widthwise size of the adhesive application area is smaller), the adhesive application device can apply adhesive to five application points E1-E5, which is fewer than the standard number of application points (e.g., six points).

[0069] On the other hand, as shown in Figure 5 (B), for the nth core piece 10 which is wider (i.e., the widthwise size of the adhesive application area is larger), the adhesive application device can apply adhesive to seven application points E11-E17, which is more than the standard number of application points.

[0070] In this case, the amount of adhesive applied at each of the application points E11-E17 shown in Fig. 5(B) (here, the diameter of the circular adhesive) is the same as the amount of adhesive applied at each of the application points E1-E5 shown in Fig. 5(A). Therefore, a larger amount of adhesive is applied to the nth core piece 10 than to the first core piece 10.

[0071] However, the present invention is not limited to this, and the adhesive application device can be arranged on the nth core piece 10 by changing only the positions of the five application points E1-E5 on the first core piece 10. In this case, in Figure 5(B), adhesive can be applied to application points E11-E13 and E16-E17, for example, so as to widen the spacing between adjacent application points (application points E14-E15 can be omitted).

[0072] In the manufacturing apparatus and method for the teeth 2 according to the first embodiment, step (4) of applying the adhesive (corresponding to station S4) may be omitted. In this case, an electromagnetic steel sheet having a known adhesive coating formed on at least one surface can be used as the hoop material W. Such an adhesive coating can be one that, when heated and pressurized, generates adhesive properties that allow the multiple core pieces in a stacked state to be fixed (secured).

[0073] Furthermore, (4) when the application of adhesive is omitted, the plurality of core pieces 10 in a stacked state may be fixed by a known method (for example, crimping, bolting, welding, etc.) When the plurality of core pieces 10 are fixed by crimping, the progressive die 30 is provided with a station for forming concave and convex portions, holes, etc. for crimping.

[0074] (5) In the outer shape punching (corresponding to station S5: an example of an outer shape punching station), a rectangular outer shape hole P5 surrounding each core piece 10 shown in FIG. 1 is punched out. This punches out the remaining outer shapes of the first to nth core pieces 10 that were not punched out in stations S3-2 to S3-n. More specifically, the portions corresponding to the upper edge of the main body piece 25 and the lower edge of the fixing piece 26 are punched out (i.e., cut out). As a result, each core piece 10 is separated from the hoop material W.

[0075] As shown in Figure 6, at station S5 of the progressive die 30, an outer shape punching punch 71 is attached to the lower part of the upper holder 35. In addition, an outer shape punching die 72 is provided on the upper surface of the lower holder 36. The outer shape punching punch 71 and the outer shape punching die 72 form a die set, which punches out rectangular areas (i.e., outer shape holes P5) surrounding the first to nth core pieces 10 of different types. In addition, a squeeze ring 73 connected to the outer shape punching die 72 is provided on the lower holder 36.

[0076] The outer shape punching die 72 has an inner peripheral wall 76 that defines a through hole 75 that holds the plurality of core pieces 10, the outlines of which have been punched, in a stacked state. The squeeze ring 73 also has an inner peripheral wall 79 that defines a through hole 78 that communicates with the lower end of the through hole 75 of the outer shape punching die 72.

[0077] The core pieces 10 whose outer shape has been punched out are separated from the hoop material W and are stacked one after another in the outer shape punching die 72. Furthermore, the stacked core pieces 10 are pushed one after another from the outer shape punching die 72 into a squeeze ring 73.

[0078] Furthermore, when the core pieces 10 whose outlines have been punched out are stacked in the punching die 72, the underside of the core piece 10 whose outline has been punched out abuts against the upper side of the core piece 10 located in the uppermost layer of the stack M of core pieces 10 whose outlines have been punched out previously. Furthermore, the stack M of core pieces 10 moves downward while receiving lateral pressure from the inner peripheral wall 79 of the squeeze ring 73, so that the underside and upper sides of adjacent core pieces 10 come into closer contact with each other. As a result, the adhesive applied in spots to the underside of the core piece 10 whose outline has been punched out spreads around the upper side of the core piece 10 located in the uppermost layer.

[0079] In addition, a hardening accelerator (or a reaction initiator, etc.) may be applied in advance to the upper surface of the hoop material W to be processed by the progressive die 30 along with press processing oil. The hardening accelerator is, for example, copper soap, a compound of fatty acid and copper, diluted with a solvent such as acetone or hepton, and the eluted copper ions promote the hardening of the adhesive. As a result, in the squeeze ring 73, the adhesive applied to the lower surface of the core piece 10 punched to the above-mentioned outer shape is mixed with the hardening accelerator applied to the upper surface of the core piece 10 located in the uppermost layer. Furthermore, the squeeze ring 73 may be provided with a heater for heating and hardening the adhesive applied to the core piece 10.

[0080] As shown in Fig. 7 , the through hole 78 of the squeeze ring 73 has a substantially rectangular shape in a plan view. Furthermore, the inner peripheral wall 79 (here, a right wall 79B and a left wall 79A: an example of two walls) of the squeeze ring 73 is provided with ridges 81, 82 that extend in the extension direction of the through hole 78 and can engage (i.e., fit into) the grooves 15, 17 of each core piece 10, respectively. The ridges 81, 82 guide the movement of the multiple core pieces 10 in the through hole 78. The ridges 81, 82 have a substantially rectangular shape in a plan view.

[0081] In the squeeze ring 73, the distance between the left wall 79A and the right wall 79B, on which the ribs 81 and 82 are respectively provided, is set to be substantially the same as the vertical width (horizontal width in FIG. 7) of the core piece 10 shown in FIG. 1. On the other hand, the distance between the front wall 79C and the rear wall 79D (an example of the other two walls), on which the ribs 81 and 82 are not provided, is set to be equal to or greater than the maximum value of the circumferential width (front-to-back width in FIG. 7) of the multiple types of core pieces 10.

[0082] It is sufficient that each core piece 10 has at least one groove, and the inner peripheral wall 79 of the squeeze ring 73 has ridges in a number corresponding to the grooves in each core piece 10. Also, ridges similar to the ridges 81 and 82 may be provided on at least a portion of the inner peripheral wall 76 of the outer shape punching die 72. Furthermore, the front wall 79C and the rear wall 79D (more precisely, the surfaces of those walls) of the squeeze ring 73, on which no ridges (here, the ridges 81 and 82) are provided, do not need to be arranged parallel to each other. In other words, the through-holes 78 of the squeeze ring 73 may have a shape that does not interfere with the circumferential width of each core piece, including a generally trapezoidal shape in plan view.

[0083] The laminate M of core pieces 10 extracted from the lower part of the squeeze ring 73 is used as teeth 2 in a stator core 1 for an axial gap motor. The manufactured teeth 2 are fitted into mounting holes 21 of a yoke 3 (see FIG. 1 ), thereby forming the stator core 1.

[0084] Further, for example, instead of providing the protrusions 82 on the inner peripheral wall 79 of the squeeze ring 73, recesses into which the fixing pieces 26 of the core pieces 10 can be received (i.e., fitted) may be provided. The recesses can guide the movement of the multiple core pieces 10 in the through holes 78.

[0085] In the example shown in Figure 2, the core piece corresponding portions are arranged in a single row in the width direction of the hoop material W, but this is not limited to this. For example, as shown in Figure 8, it is also possible to configure the core piece corresponding portions in multiple rows (here, two rows) in the width direction of the hoop material W.

[0086] 8, in (2) punching the side edges of the fixed piece (corresponding to station S2), a plurality of punch holes are punched out by a side edge punch and a side edge punching die (not shown) for the fixed piece 26. The plurality of punch holes include two rectangular punch holes P2a arranged to sandwich two core piece corresponding portions, and one rectangular punch hole P2b arranged between the two core piece corresponding portions and larger in size than punch hole P2a.

[0087] In (3-1) punching the side edge of the first body piece, (3-2) punching the side edge of the second body piece, ..., and (3-n) punching the side edge of the n-th body piece (corresponding to stations S3-1 to S3-n: an example of a plurality of side edge punching stations), a plurality of punch holes are punched. The plurality of punch holes include two rectangular punch holes P3a-1 to P3a-n arranged to sandwich two core piece corresponding portions, and one rectangular punch hole P3b-1 to P3b-n arranged between the two core piece corresponding portions.

[0088] In Figure 8, in the first row (lower side in Figure 8), the circumferential width of the core piece corresponding portion is set to gradually increase from the punching of the side edge of the first body piece (3-1) to the punching of the side edge of the nth body piece (3-n). On the other hand, in the second row (upper side in Figure 8), the circumferential width of the core piece corresponding portion is set to gradually decrease from the punching of the side edge of the first body piece (3-1) to the punching of the side edge of the nth body piece (3-n). By combining the core piece corresponding portions in these two rows, it is possible to suppress the increase in the width of the hoop material W, and as a result, it is possible to reduce scrap generated after the core pieces 10 are punched (i.e., improve yield).

[0089] (4) In the adhesive application step (corresponding to station S4: an example of an adhesive application station), adhesive is applied to the core piece corresponding portions of each row.

[0090] (5) In the outer shape punching (corresponding to station S5: an example of an outer shape punching station), the outer shapes of the core piece corresponding portions in two rows are punched out together. However, station S5 may be provided with two outer shape punching punches and two outer shape punching dies for punching the outer shapes of the core pieces 10 in each row, respectively. The same applies to the squeeze rings.

[0091] Second Embodiment Next, a manufacturing device and a manufacturing method for teeth 2 in a stator core 1 for an axial gap motor according to a second embodiment will be described. In the following, in the second embodiment, components similar to those shown in the first embodiment are denoted by the same reference numerals in the drawings, etc. Furthermore, matters not specifically mentioned below in the second embodiment are similar to those in the first embodiment.

[0092] In the progressive die 30 of the second embodiment, one movable station S3 is provided instead of stations S3-1 to S3-n in the first embodiment, which perform (3-1) punching the side edge of the first main body piece to (3-n) punching the side edge of the nth main body piece.

[0093] As shown in Fig. 9, the progressive die 30 according to the second embodiment includes a pair of side edge punching dies 49A, 49B that are displaceable in the width direction of the hoop material W (see the arrow in Fig. 9) in the lower die of station S3. The side edge punching dies 49A, 49B have the same configuration as the side edge punching die 49 in the first embodiment, except that they are displaceable so as to move toward or away from each other. The progressive die 30 also includes drive devices 81A, 81B (e.g., motors) for driving (i.e., displacing) the side edge punching dies 49A, 49B, respectively.

[0094] Although not shown, the progressive die 30 is provided with a pair of side edge punching punches that are displaceable in conjunction with the pair of side edge punching dies 49A, 49B in the upper die of station S3. The pair of side edge punching punches have the same configuration as the side edge punch 41 in the first embodiment, except that they are displaceable so as to move toward or away from each other.

[0095] At station S3, drive devices 81A and 81B are controlled to displace side edge punching dies 49A and 49B and their corresponding side edge punching punches according to the type (i.e., circumferential width) of core pieces 10. This allows multiple types of core pieces 10 to be processed, similar to stations S3-2 to S3-n according to the first embodiment described above. In other words, the side edges (circumferential side edges in FIG. 1) of the first to nth core pieces 10 are punched out at different positions in the width direction of the hoop material W at station S3.

[0096] Third Embodiment Next, a manufacturing device and a manufacturing method for teeth 2 in a stator core 1 for an axial gap motor according to a third embodiment will be described. Hereinafter, in the third embodiment, components similar to those shown in the first or second embodiment are denoted by the same reference numerals in the drawings, etc. Furthermore, in the third embodiment, matters not specifically mentioned below are similar to those in the first or second embodiment.

[0097] As shown in Figure 10, the stator core 1 for an axial gap motor according to the third embodiment has the same configuration as the stator core 1 shown in Figure 1, except that the grooves 15, 17 of each tooth 2 are omitted.

[0098] The progressive die 30 of the third embodiment is provided with a plurality of stations S101-S105, which correspond to each of the steps (101)-(105) shown in Figure 11 and in which processing is performed on the portions of the hoop material W corresponding to each core piece 10.

[0099] 11 , the manufacturing of the teeth 2 includes (101) punching a pilot hole, (102) pre-cutting of the scrap portion, (103-1) first pre-punching, (103-2) second pre-punching, ..., (103-n) nth pre-punching, (104) application of adhesive, and (105) punching of the outer shape of the core piece 10. The first to nth pre-punchings refer to pre-punching of the outer shapes of the first to nth core pieces 10, each of which is different in type.

[0100] In this embodiment, in the process (105) of punching out the outer shapes of the core pieces 10, the outer shapes of the rough core pieces 170 are punched out, which include the portions corresponding to the core pieces 10 and the annular scrap portions (or scrap pieces) 100 that surround (i.e., contain) the core pieces 10. The scrap portions 100 and the rough core pieces 170 have an approximately rectangular outer shape.

[0101] In (101) punching pilot holes (corresponding to station S101), similar to the above-mentioned (1) punching pilot holes, circular pilot holes P1 are punched near the left and right side edges of the hoop material W using a pilot hole punch 111 and a pilot hole punching die 112 shown in Figure 12.

[0102] (102) In the temporary cutting of the scrap portion (corresponding to station S102: an example of a temporary cutting station), at least one (here, a pair) cutting line L (an example of a cutting portion) is formed from the outer edge of the portion corresponding to each scrap portion 100 to the outer edge of the portion corresponding to each core piece 10.

[0103] 12, the progressive die 30 at station S102 includes a temporary cutting punch 115 and a temporary cutting die 116 that punch or half-punch (cut and raise) the cutting line L (see FIG. 11), and a temporary cutting support 117 that is disposed within the temporary cutting die 116 and pushes back the punched or half-punched portion including the cutting line L. The temporary cutting support 117 is biased upward by a spring 118. This realizes the push-back of the portion that defines the punched or half-punched cutting line L.

[0104] At station S102, the scrap portion 100 is not separated by the cutting lines L but is in a provisionally cut state.

[0105] In (103-1) the first pre-punching, (103-2) the second pre-punching, ..., and (103-n) the nth pre-punching (corresponding to stations S103-1 to S103-n: an example of multiple pre-punching stations), the outer shapes of the first to nth core pieces 10 of different types are punched or half-punched and then pushed back.

[0106] 12, the progressive die 30 includes pairs of preliminary punches 121-1 to 121-n and preliminary punching dies 122-1 to 122-n for punching or half-punching the outer shapes of a plurality of core pieces 10 according to type, and preliminary cutting cradles 123-1 to 123-n disposed within the preliminary punching dies 122-1 to 122-n, respectively, for pushing back the punched or half-punched core pieces 10. The preliminary cutting cradles 123-1 to 123-n are biased upward by springs 124-1 to 124-n, respectively. This allows the core pieces 10 whose outer shapes have been punched or half-punched to be pushed back (i.e., the punched or half-punched core pieces 10 are again fitted into the punched holes in the hoop material W).

[0107] Each of the pre-punching punches 121-1 to 121-n can selectively perform a punching operation in which its tip is lowered to a position where it can punch or half-punch the hoop material W, and a standby operation in which its tip is lowered only to a position above the hoop material W (i.e., a position where it cannot punch or half-punch). In other words, the pre-punching punches 121-1 to 121-n can perform a punching or half-punching operation only on a specific type of core piece 10 (i.e., having a specific circumferential width) to be processed.

[0108] Such switching of the pre-punching operation can be realized, for example, by providing well-known cam mechanisms 127-1 to 127-n that are connected to the pre-punching punches 121-1 to 121-n, respectively, and that enable the range of their descent to be changed. These cam mechanisms 127-1 to 127-n are driven by drive devices 128-1 to 128-n (for example, motors), and the operation of the drive devices 128-1 to 128-n can be controlled by a controller 129.

[0109] In (104) adhesive application (corresponding to station S104: an example of an adhesive application station), adhesive is applied to the core piece corresponding portions of the hoop material W. Here, an example is shown in which adhesive is applied in spots to multiple application points E set in the core piece corresponding portions. However, adhesive may also be applied to the portion corresponding to the scrap portion 100 (i.e., the outside of the core piece 10 in the rough core piece 170). Note that station S104, which applies adhesive, may be provided as the station immediately before station S105, which punches out the outer shape.

[0110] At station S104, the progressive die 30 can apply adhesive to predetermined locations on the hoop material W using an adhesive applicator 160 provided on the lower die, as shown in FIG. 12 . The adhesive applicator 160 is of a transfer type and includes an application table 162 and a cam mechanism 164. The cam mechanism 164 is driven by a drive unit 166 to move the application table 162 between an elevated position and a lowered position. When in the elevated position, the application table 162 transfers (applies) adhesive to each of the application points E set at multiple locations on the underside of the hoop material W with each press operation, except during measurement to set the number of laminated core pieces 10.

[0111] In (105) punching out the outer shape (corresponding to station S105: an example of an outer shape punching station), outer shapes P105 of the rough core pieces 170 including different types of first to nth core pieces 10 are punched out. The outer shapes P105 of the punched rough core pieces 170 have the same shape regardless of the type of core piece 10.

[0112] 12, in station S105 of the progressive die 30, an outer shape punching punch 171 is attached to the lower part of the upper holder 35. In addition, an outer shape punching die 172 is attached to the upper surface of the lower holder 36. The outer shape punching punch 171 and the outer shape punching die 172 form a die set, which punch out the outer shapes P105 of the rough core pieces 170 including the first to nth core pieces 10. In addition, a squeeze ring 173 connected to the outer shape punching die 172 is provided in the lower holder 36.

[0113] The rough core pieces 170, including the core pieces 10 whose outlines have been punched out, are separated from the hoop material W and stacked one after another in an outline punching die 172. The stacked rough core pieces 170 are then pushed one after another from the outline punching die 72 into a squeeze ring 173. In this case, as shown in Figure 13, the through hole 183 of the squeeze ring 173 has substantially the same shape as the outline of the rough core pieces 170. The stack M170 of rough core pieces 170 moves while receiving lateral pressure from the inner peripheral wall that defines the through hole 183 of the squeeze ring 173, so that the bottom and top surfaces of adjacent rough core pieces 170 come into closer contact with each other.

[0114] In this embodiment, a pair of cutting lines L are provided to connect the left edge 25A and the right edge 25B of the main body piece 25 of the core piece 10. However, as shown by the two-dot chain lines in Figure 13, an additional (or alternative) cutting line L100 may be provided to connect the upper edge 25C of the main body piece 25 and the lower edge 26D of the fixing piece 26.

[0115] The stack M170 of rough core pieces 170 taken out from the bottom of the squeeze ring 173 includes a stack M of core pieces 10 and a stack M100 of scrap portions 100. As shown in Fig. 14, the stack M of core pieces 10 can be obtained by separating the stack M100 of scrap portions 100 from the stack M170 of rough core pieces 170. In this case, the stack M of core pieces 10 and the stack M100 of scrap portions 100 can be separated along the cutting line L formed in the above-mentioned station S102 and the outline line formed (i.e., pre-punched) in stations S103-1 to S103-n.

[0116] While the present invention has been described above based on specific embodiments, these embodiments are merely examples, and the present invention is not limited to these embodiments. Not all of the components of the manufacturing device and manufacturing method for teeth of an axial gap motor stator core according to the present invention shown in the above embodiments are necessarily essential, and can be selected as appropriate within the scope of the present invention.

[0117] For example, the stator core 1 for an axial gap motor shown in the embodiment may be used in a generator. Furthermore, the direction (up and down, etc.) in which the progressive die 30 is arranged is not limited to the direction shown in the above-described embodiment. Furthermore, in the above-described embodiment, a configuration was shown in which grooves were provided on the teeth 2 (i.e., the core pieces 10) and corresponding ridges were provided on the squeeze ring 73, but conversely, similar ridges may be provided on the teeth 2 and corresponding similar grooves may be provided on the squeeze ring 73.

[0118] DESCRIPTION OF SYMBOLS 1: Stator core 2: Teeth 3: Yoke 4: Coil 10: Core piece 12: Teeth body 12A: Left side surface 12B: Right side surface 12C: Upper surface 13: Mounting portion 13A: Left side surface 13B: Right side surface 13D: Lower surface 14: Inner peripheral main portion 15: Groove 16: Outer peripheral end portion 17: Groove 20: Opening 21: Mounting hole 25: Body piece 25A: Left side edge 25B: Right side edge 25C: Upper edge 26: Fixing piece 26D: Lower edge 30: Progressive die 35: Upper holder 36: Lower holder 38: Backing plate 39: Punch plate 41: Side edge punching punch 43: Stripper 44: Stripper body 45 : Stripper plate 47 : Die plate 49 : Side edge punching die 49A: Side edge punching die 49B: Side edge punching die 51 : Knockout 55 : Through hole 57 : Spring chamber 59 : Plug 60 : Stripper spring 62 : Stopper 71 : Outer shape punching punch 72 : Outer shape punching die 73 : Squeeze ring 75 : Through hole 76 : Inner peripheral wall 78 : Through hole 79 : Inner peripheral wall 79A: Left wall 79B: Right wall 79C: Front wall 79D: Rear wall 81 : Protrusion 81A: Drive unit 81B: Drive unit 82 : Protrusion 100 : Scrap portion 111 : Pilot hole punching punch 112 : Pilot hole punching die 115: Temporary cutting punch 116: Temporary cutting die 117: Temporary cutting rest 118: Spring 121: Temporary punching punch 122: Temporary punching die 123: Temporary cutting rest 124: Spring 127: Cam mechanism 128: Drive unit 129: Controller 160: Adhesive application device 162: Application table 164: Cam mechanism 166: Drive unit 170: Rough core piece 171: Outer shape punching punch 172: Outer shape punching die 173: Squeeze ring 183: Through hole E: Application point L, L100: Cutting line M: Laminated body M100: Laminated body M170: Laminated body P1: Pilot hole P105: Outer shape P2: Punching hole P2a: Punching hole P2b: Punching hole P3 : Punched hole P3a: Punched hole P3b: Punched hole P5: Outer hole S1-S5: Station S101-S105: Station W: Hoop material X: Axis

Claims

1. A manufacturing apparatus for teeth of a stator core for an axial gap motor, wherein the teeth are configured as a laminated core including a plurality of core pieces laminated in the radial direction of the stator core, the plurality of core pieces include a plurality of types of core pieces having different widths in the circumferential direction of the stator core, and are arranged so that the width in the circumferential direction in at least a part of the teeth gradually increases toward the outer side in the radial direction, and the manufacturing apparatus is provided with a plurality of stations for performing processing on a strip steel plate intermittently conveyed in a predetermined conveying direction at positions corresponding to the respective core pieces, the plurality of stations include a plurality of temporary punching stations for punching or semi-punching the outer shape of each core piece according to the type of each core piece in the strip steel plate and then pushing it back, and an outer shape punching station for separating each of the rough core pieces including at least the pushed-back core pieces from the strip steel plate by punching the rough core pieces and laminating the separated rough core pieces, each of the temporary punching stations includes a pair of temporary punching punches and a temporary punching die for punching or semi-punching the outer shape of the plurality of core pieces according to the type, and a temporary punching pedestal disposed in the temporary punching die for pushing back the punched or semi-punched core pieces, the manufacturing apparatus for teeth of a stator core for an axial gap motor.

2. The rough core piece includes each of the pushed-back core pieces and a scrap piece surrounding each of the core pieces, the outer shape punching station includes a pair of outer shape punching punches and an outer shape punching die for punching the outer shape of each of the rough core pieces, and a squeezing ring connected to the outer shape punching die, and the squeezing ring is formed with a through hole for holding the plurality of rough core pieces having the outer shape punched in a stacked state, the manufacturing apparatus for teeth of a stator core for an axial gap motor according to claim 1.

3. The plurality of stations includes a temporary cutting station that forms at least one cutting portion extending from the outer edge of the portion corresponding to each scrap piece to the outer edge of the portion corresponding to each core piece in the strip steel plate. The outer shape punching station includes a temporary cutting punch and a temporary cutting die for punching or semi-punching the cutting portion, and a temporary cutting pedestal disposed within the temporary cutting die for pushing back each of the punched or semi-punched core pieces. The manufacturing apparatus for teeth of a stator core for an axial gap motor according to claim 2.

4. The plurality of stations includes an adhesive application station for applying an adhesive to at least one surface of the strip steel plate. The adhesive application station is provided with an adhesive application device for applying the adhesive to at least the portions corresponding to each of the core pieces in the strip steel plate. The manufacturing apparatus for teeth of a stator core for an axial gap motor according to any one of claims 1 to 3.

5. The adhesive application device is provided to change the application amount of the adhesive to the portions corresponding to each of the core pieces according to the type of each of the core pieces punched in the strip steel plate. The manufacturing apparatus for teeth of a stator core for an axial gap motor according to claim 4.

6. The adhesive application device is provided to change the application position of the adhesive to the portions corresponding to each of the core pieces according to the type of each of the core pieces punched in the strip steel plate. The manufacturing apparatus for teeth of a stator core for an axial gap motor according to claim 4.

7. Among the plurality of stations, the adhesive application station is the station immediately before the outer shape punching station. The manufacturing apparatus for teeth of a stator core for an axial gap motor according to claim 4.

8. The strip steel plate includes an electromagnetic steel plate having a film formed in advance on at least one surface. The film generates an adhesive ability to fix the plurality of core pieces in a laminated state by heating and pressing. The manufacturing apparatus for teeth of a stator core for an axial gap motor according to claim 1.

9. A method for manufacturing teeth of a stator core for an axial gap motor, wherein the teeth are configured as a laminated core including a plurality of core pieces laminated in the radial direction of the stator core, the plurality of core pieces include a plurality of types of core pieces having different widths in the circumferential direction of the stator core, and are arranged so that the width in the circumferential direction in at least a part of the teeth gradually increases toward the outside in the radial direction, in a strip-shaped steel plate intermittently conveyed in a predetermined conveying direction, after punching or semi-punching the outer shape of each core piece according to the type of each core piece and then push-back, separating each of the rough core pieces including at least the push-back core pieces from the strip-shaped steel plate by punching the rough core pieces, laminating the separated rough core pieces, and removing scrap pieces surrounding each core piece from each core piece in the plurality of laminated rough core pieces. A method for manufacturing teeth of a stator core for an axial gap motor.

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