WO2021090854A1 - Method for manufacturing dynamo-electrical machine core - Google Patents

Method for manufacturing dynamo-electrical machine core Download PDF

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Publication number
WO2021090854A1
WO2021090854A1 PCT/JP2020/041276 JP2020041276W WO2021090854A1 WO 2021090854 A1 WO2021090854 A1 WO 2021090854A1 JP 2020041276 W JP2020041276 W JP 2020041276W WO 2021090854 A1 WO2021090854 A1 WO 2021090854A1
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WIPO (PCT)
Prior art keywords
yoke
teeth
yoke portion
extension region
comb
Prior art date
Application number
PCT/JP2020/041276
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French (fr)
Japanese (ja)
Inventor
嘉仁 ▲高▼橋
大地 村上
Original Assignee
株式会社デンソー
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Filing date
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Application filed by 株式会社デンソー filed Critical 株式会社デンソー
Publication of WO2021090854A1 publication Critical patent/WO2021090854A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies

Definitions

  • the present disclosure relates to a method for manufacturing a spiral rotating machine core.
  • a stator core in which a strip-shaped sheet having a yoke portion extending in a strip shape and a plurality of teeth portions extending from one end in the width direction of the yoke portion is spirally wound is known.
  • the stator core is manufactured, for example, by bending the yoke portion of the strip-shaped sheet so as to be curved in the width direction, and then laminating the strip-shaped sheet while winding it spirally.
  • the yoke portion is bent so as to be curved in the width direction by rolling so that the amount of elongation in the longitudinal direction increases from one end portion to the other end portion in the width direction.
  • the winding diameter tends to vary in the stacking direction when spirally wound. If the winding diameter varies, the outer diameter of the stator core may not be within the predetermined dimensions and may not be assembled to the housing of the rotary electric machine. Further, the variation in the winding diameter causes a step on the inner surface and the outer surface of the stator core. As a result, a gap is created in the magnetic circuit of the rotating electric machine, the magnetic characteristics are lowered, the fixing force of the stator core is lowered, and vibration and abnormal noise are generated.
  • Patent Document 1 discloses a method of forming a groove portion extending in the longitudinal direction of the yoke portion at a yoke portion of the strip-shaped sheet or a portion of the plate material corresponding to the yoke portion. According to Patent Document 1, by forming the groove portion, it is possible to suppress the variation in the winding diameter when the strip-shaped sheet is wound in a spiral shape after being bent.
  • the yoke portion has a teeth portion extension region in which a teeth portion extending from the yoke portion is formed and a teeth portion non-extension region in which a teeth portion extending from the yoke portion is not formed.
  • the tooth portion extension region is difficult to bend, and the tooth portion non-extension region is easy to bend.
  • a notch for positioning at the time of winding may be provided at the end portion in the width direction of the yoke portion before winding for various purposes and purposes. The yoke portion is more easily bent at the position where the notch is formed than at the position where the notch is not formed.
  • the present disclosure has been made in view of such a problem, and is intended to provide the manufacture of a rotary machine core capable of suppressing variations in the diameter dimension of the rotary machine core.
  • the first aspect of the present disclosure has a yoke portion extending in a band shape and a plurality of teeth portions extending from the first end in the width direction of the yoke portion, and the teeth portion extending from the yoke portion in the yoke portion.
  • the center line that divides the yoke portion into two in the width direction and the width direction of the yoke portion that becomes the inner peripheral side by winding in the molding step An overhanging portion is formed between the plate material and the end portion of the plate material in the thickness direction of the plate material, or the yoke portion in the plate material corresponds to the teeth portion extension region of the yoke portion.
  • the plate material is more than the periphery. Is a method for manufacturing a rotary machine core, in which an overhang forming step of forming an overhanging portion in the plate thickness direction is performed before the above forming step.
  • a second aspect of the present disclosure has a yoke portion extending in a band shape and a plurality of teeth portions extending from the first end in the width direction of the yoke portion, and the teeth portion extending from the yoke portion in the yoke portion.
  • At least one groove extending along the extending direction of the yoke portion is formed in the teeth portion non-extension region of the yoke portion in the comb-shaped sheet, or the teeth portion non-extension of the yoke portion in the plate material is formed.
  • a method of manufacturing a rotary machine core is in which a groove forming step of forming at least one groove extending along an extending direction of a portion corresponding to the yoke portion is performed prior to the forming step at a portion corresponding to a region.
  • a third aspect of the present disclosure has a yoke portion extending in a band shape and a plurality of teeth portions extending from the first end in the width direction of the yoke portion, and the teeth portion extending from the yoke portion in the yoke portion.
  • a thin portion having a thickness smaller than the teeth portion extension region is formed in the teeth portion non-extension region of the yoke portion in the comb-shaped sheet, or the teeth portion non-extension region of the yoke portion in the plate material is formed.
  • the present invention is a method for manufacturing a rotary machine core, in which a thinning step of forming a thin portion having a thickness smaller than that corresponding to the portion extending region of the teeth portion is performed at a corresponding portion before the molding step.
  • a fourth aspect of the present disclosure is a yoke portion extending in a strip shape, a plurality of teeth portions extending from the first end in the width direction of the yoke portion, and the yoke portion that becomes an outer peripheral side by winding in the following molding process.
  • At least one groove extending along the extending direction of the yoke portion is formed in the yoke portion at the position where the notch portion of the comb-shaped sheet is formed, or the notch portion is formed in the plate material.
  • a groove forming step of forming at least one groove extending along the extending direction of the portion corresponding to the yoke portion is performed at the portion corresponding to the yoke portion at the portion corresponding to the position to be formed. It is in the manufacturing method of the rotating machine core.
  • a fifth aspect of the present disclosure is a yoke portion extending in a strip shape, a plurality of teeth portions extending from the first end in the width direction of the yoke portion, and the yoke portion that becomes an outer peripheral side by winding in the following molding process.
  • a thin portion having a thickness smaller than the periphery is formed in the yoke portion at the position where the notch portion is formed in the comb-shaped sheet, or corresponds to the position where the notch portion is formed in the plate material.
  • the comb-shaped sheet before the molding step has an overhanging portion in the above-mentioned predetermined region of the teeth portion extension region.
  • the predetermined region is between the center line in the tooth portion extension region and the end portion of the yoke portion that becomes the inner peripheral side at the time of winding in the molding process. Since the overhanging portion is crushed and stretched by rolling in the molding step, the teeth portion extension region is likely to be stretched to the same extent as the teeth portion non-extension region. As a result, the amount of elongation of the yoke portion is substantially made uniform in the teeth portion extension region and the teeth portion non-extension region during winding in the molding process. Therefore, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process.
  • the comb-shaped sheet before the forming step has a groove in the non-extended region of the teeth portion.
  • the groove portion suppresses the elongation of the non-extending region of the tooth portion in the circumferential direction during winding in the molding process. Therefore, in the molding step, the amount of elongation of the yoke portion is substantially made uniform in the teeth portion non-extension region and the teeth portion extension region. As a result, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process.
  • the comb-shaped sheet before the molding step has a thinning portion in the non-extended region of the teeth portion.
  • the thin-walled portion has less material to be stretched by rolling in the molding process. Therefore, in the non-extended region of the teeth portion where the thin-walled portion is formed, the elongation in the molding step is suppressed as compared with the extended region of the teeth portion.
  • the amount of elongation of the yoke portion is substantially made uniform in the teeth portion non-extension region and the teeth portion extension region. Therefore, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process.
  • the comb-shaped sheet before the forming step has a groove in the yoke portion at the position where the notch is formed.
  • the formed portion of the groove portion becomes difficult to extend during winding in the molding process. That is, at the time of winding in the molding process, the elongation of the yoke portion in which the notch portion is formed is suppressed.
  • the elongation of the yoke portion in the circumferential direction is substantially made uniform. Therefore, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process.
  • the comb-shaped sheet before the molding step has a thin-walled portion in the yoke portion at the position where the notch portion is formed. Since the thin-walled portion has a small amount of material to be stretched by rolling in the molding process, the elongation in the molding process is suppressed at the portion where the thin-walled portion is formed. That is, in the notch portion, the elongation is suppressed by the thin-walled portion. As a result, in the molding process, the elongation of the yoke portion in the circumferential direction is substantially made uniform. Therefore, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process.
  • FIG. 1 is a schematic view of a rotary machine core according to the first embodiment.
  • FIG. 2 is a schematic view of the upper surface of the rotary machine core according to the first embodiment.
  • FIG. 3 is a schematic view of the overhang molding step and the sheet forming step in the first embodiment.
  • FIG. 4 is an explanatory view showing the formation position of the overhanging portion in the plate material in the first embodiment.
  • 5 (a) is a schematic view showing the periphery of the overhanging portion of the comb-shaped sheet in the first embodiment, and
  • FIG. 5 (b) is a cross-sectional view taken along the line bb in FIG.
  • FIG. 5 (c) is a cross-sectional view taken along the line cc in FIG. 5 (a).
  • FIG. 6 is an explanatory diagram showing variations (a) to (d) in the shape of the overhanging portion in the first embodiment.
  • FIG. 7 is a schematic view showing how the overhanging portion in the first embodiment is stretched by rolling in the molding step.
  • FIG. 8 is a schematic view showing a molding process in which the comb-shaped sheet is spirally wound according to the first embodiment.
  • FIG. 9 is a schematic view of the rotary machine core manufacturing line according to the first embodiment.
  • FIG. 10 is a schematic view of a die for forming an overhanging portion of a press machine according to the first embodiment.
  • FIG. 11 is a view of the bending device of FIG.
  • FIG. 9 in the first embodiment as viewed from the direction of arrow XII.
  • FIG. 12 is a view of the bending device of FIG. 9 in the first embodiment as viewed from the direction of arrow XIII.
  • FIG. 13 is a schematic view showing a roller of a preforming machine for forming an overhanging portion in the first modification.
  • FIG. 14 is a schematic view of the sheet forming step and the overhang molding step in the modified example 2.
  • FIG. 15 is an explanatory view showing the formation position of the overhanging portion on the comb-shaped sheet in the modified example 2.
  • FIG. 16 is a schematic view of the upper surface of the rotary machine core according to the second embodiment.
  • FIG. 17 is a schematic view of the groove forming step and the sheet forming step in the second embodiment.
  • FIG. 18 is an explanatory view showing the formation position of the groove portion in the plate material in the second embodiment.
  • 19 (a) is a schematic view showing the periphery of the groove portion in the comb-shaped sheet according to the second embodiment, and
  • FIG. 19 (b) is a cross-sectional view taken along the line bb in FIG. 19 (a).
  • FIG. 20 is an explanatory view showing variations (a) to (d) of the shape of the groove portion in the second embodiment.
  • 21 (a) is a schematic cross-sectional view of a die for forming a groove of a press machine in the second embodiment, and
  • FIG. 21 (b) is a schematic view showing a press surface of the upper die in the second embodiment.
  • FIG. 22 (a) is a schematic view showing the roller of the preforming machine for forming the groove in the modified example 3 from the lateral direction
  • FIG. 22 (b) shows the roller surface of the roller for forming the groove in the modified example 3.
  • FIG. 23 is a schematic view of the sheet forming step and the groove forming step in the modified example 4.
  • FIG. 24 is an explanatory view showing the formation position of the groove portion in the comb-shaped sheet in the modified example 4.
  • FIG. 25 is a schematic view of the rotary machine core in the third embodiment.
  • FIG. 26 is a schematic view of the upper surface of the rotary machine core in the third embodiment.
  • FIG. 27 is a partially enlarged schematic view of the comb-shaped sheet according to the third embodiment.
  • FIG. 28 is a partially enlarged schematic view of the comb-shaped sheet in which a large notch is formed in the third embodiment.
  • FIG. 29 is a schematic view of the upper surface of the rotary machine core according to the fourth embodiment.
  • FIG. 30 is a schematic view of the thinning step and the sheet forming step in the fourth embodiment.
  • FIG. 31 is an explanatory view showing the formation position of the thin-walled portion in the plate material in the fourth embodiment.
  • FIG. 32 (a) is a schematic view showing the periphery of the thin-walled portion of the comb-shaped sheet according to the fourth embodiment, and
  • FIG. 32 (b) is a cross-sectional view taken along the line bb in FIG. 32 (a).
  • FIG. 32 (c) is a cross-sectional view taken along the line cc in FIG. 32 (a).
  • FIG. 33 is an explanatory view showing variations (a) to (d) in the shape of the thin-walled portion in the fourth embodiment.
  • FIG. 34 (a) is a schematic cross-sectional view of the die for forming a thin wall portion of the press machine in the fourth embodiment
  • FIG. 34 (b) is a schematic view showing the press surface of the upper die in the fourth embodiment.
  • FIG. 35 (a) is a schematic view showing the roller of the preforming machine for forming the thin wall portion in the modified example 5 from the lateral direction
  • FIG. 35 (b) is a schematic view of the roller surface of the roller for forming the thin wall portion.
  • FIG. 35 (a) is a schematic view showing the roller of the preforming machine for forming the thin wall portion in the modified example 5 from the lateral direction
  • FIG. 35 (b) is a schematic view of the roller surface of the roller for forming the thin
  • FIG. 36 is a schematic view of the sheet forming step and the thinning step in the modified example 6.
  • FIG. 37 is an explanatory view showing the formation position of the thin-walled portion on the comb-shaped sheet in the modified example 6.
  • FIG. 38 is a schematic view of the upper surface of the rotary machine core in the fifth embodiment.
  • FIG. 39 is a schematic view of the sheet forming step and the groove forming step in the fifth embodiment.
  • FIG. 40 is a schematic view around the notch portion of the comb-shaped sheet in the fifth embodiment.
  • FIG. 41 is a schematic view of the groove forming step and the sheet forming step in the modified example 7.
  • FIG. 42 is a schematic view of the upper surface of the rotary machine core in the sixth embodiment.
  • FIG. 43 is a schematic view of the sheet forming step and the thinning step in the sixth embodiment.
  • FIG. 44 (a) is a schematic view around the notch portion of the comb-shaped sheet in the sixth embodiment
  • FIG. 44 (b) is a cross-sectional view taken along the line bb in FIG. 44 (a).
  • 44 (c) is a cross-sectional view taken along the line cc in FIG. 44 (a).
  • FIG. 45 is a schematic view of the thinning step and the sheet forming step in the modified example 8.
  • the rotary machine core 1 has a cylindrical shape such as a cylindrical shape, and has a through hole penetrating the central axis A.
  • the rotary machine core 1 is composed of a comb-shaped sheet 4 that is spirally wound and laminated.
  • the comb-shaped sheet 4 has a strip-shaped yoke portion 2 and a large number of teeth portions 3.
  • the tooth portion 3 extends from one end of the yoke portion 2 in the width direction toward the central axis of the rotary machine core 1.
  • first end 21 the end on the side where the teeth portion 3 is formed in the width direction of the yoke portion 2
  • first end 21 the end on the side where the teeth portion 3 is not formed
  • Two ends 22 Two ends 22 ".
  • the yoke portion 2 and the teeth portion 3 are integrally formed. There are substantially no gaps, joints, or joint surfaces at the boundary between the yoke portion 2 and the teeth portion 3, and the surface roughness hardly changes between the boundary and its periphery.
  • the yoke portion 2 and the teeth portion 3 are formed of a single plate, and are, for example, flush with each other.
  • a long comb-shaped sheet 4 is spirally wound, and the plate surfaces of the wound comb-shaped sheet 4 are in contact with each other. Specifically, the comb-shaped sheet 4 is wound and laminated while changing the position in the axial direction in one direction to form the rotary machine core 1.
  • the yoke portion 2 is a band-shaped portion extending along the circumferential direction X of the rotary machine core 1.
  • the band-shaped yoke portion 2 is spirally wound and has a circumferential direction X like the rotary machine core 1.
  • the teeth portion 3 extends from the yoke portion 2 along the direction Y orthogonal to the circumferential direction X of the yoke portion 2 and the rotary machine core 1.
  • the direction Y orthogonal to the circumferential direction X is the radial direction of the rotary machine core 1.
  • the teeth portion 3 extends toward, for example, the central axis A of the rotary machine core 1.
  • the teeth portion 33 may extend in the direction opposite to the central axis A. That is, as shown in FIGS. 1 and 2, the teeth portion 33 may extend toward the inside of the tubular rotary machine core 1, or may extend toward the outside although not shown. ..
  • the yoke portion 2 has an end portion 25 which is an outer peripheral side O and an end portion 26 which is an inner peripheral side I.
  • the first end 21 becomes the end portion 26 of the inner peripheral side I
  • the second end 22 becomes the outer peripheral side O. It becomes the end 25 of.
  • the first end 21 is the end portion 25 on the outer peripheral side O
  • the second end 22 is the outer peripheral side O. It becomes the end part 26.
  • the end portion that is the outer peripheral side O is referred to as the outer peripheral end 25, and the end portion that is the inner peripheral side I is referred to as the inner peripheral end 26.
  • the rotary machine core 1 is manufactured by the following procedure after performing an overhang molding step, a sheet forming step, and a molding step.
  • the overhang molding step for example, the overhang portion 2A is formed at a predetermined position of the plate material 40.
  • the sheet forming step the comb-shaped sheet 4 is punched from the plate material 40.
  • the plate material 40 is, for example, an electromagnetic steel plate.
  • the comb-shaped sheet 4 has a yoke portion 2 extending in a strip shape and a teeth portion 3 extending in a direction orthogonal to the longitudinal direction L of the yoke portion 2.
  • the longitudinal direction L of the yoke portion can also be referred to as the extension direction L of the yoke portion.
  • the direction orthogonal to the longitudinal direction L of the yoke portion 2 in the comb-shaped sheet 4 can be said to be the width direction W of the yoke portion 2.
  • the yoke portion 2 has a teeth portion extension region 23 and a teeth portion non-extension region 24.
  • the tooth portion extension region 23 is a region in the yoke portion 2 in which the teeth portion 3 extending from the first end 21 of the yoke portion 2 is formed.
  • the teeth portion non-extension region 24 is a region in the yoke portion 2 in which the teeth portion 3 extending from the first end 21 of the yoke portion 2 is not formed.
  • the teeth portion extension region 23 and the teeth portion non-extension region 24 are alternately present in the extension direction L.
  • the teeth portion extension region 23 is a region sandwiched between the boundary between the first end 21 of the yoke portion 2 and the teeth portion 3 (that is, the root portion of the teeth portion) and the second end 22 of the yoke portion 2. It can be said. Further, in other words, it can be said that it is a region sandwiched by a virtual perpendicular line drawn from both ends of the root of the tooth portion 3 toward the second end 22. On the other hand, it can be said that the teeth portion non-extension region 24 is a region sandwiched between the teeth portion extension regions 23 in the yoke portion 2.
  • the overhang molding step is performed before the molding step, and the overhanging portion 2A may be formed on the comb-shaped sheet 4 after the sheet forming step, or may be formed on the plate material 40 before the sheet forming step. You may. That is, it is sufficient that the overhanging portion 2A is formed before the molding step. In this embodiment, a case where the overhang portion 2A is formed on the plate material 40, that is, a case where the overhang molding step is performed before the sheet forming step will be described.
  • the plate material 40 before the sheet forming process has a portion 2P corresponding to the yoke portion 2 and a portion 3P corresponding to the teeth portion 3.
  • the portion 2P corresponding to the yoke portion 2 is a region where the yoke portion is planned to be formed in the plate material 40.
  • the portion 2P corresponding to the yoke portion is a region that becomes the yoke portion 2 by punching in the sheet forming step, and has the same shape as the yoke portion 2 in the comb-shaped sheet 4 after punching.
  • the portion 3P corresponding to the teeth portion 3 is a region where the teeth portion is planned to be formed in the plate material 40.
  • the portion 3P corresponding to the teeth portion 3 is a region that becomes the teeth portion 3 by punching in the sheet forming step, and has the same shape as the teeth portion 3 in the comb-shaped sheet 4 after punching.
  • the "location corresponding to” has the same meaning as the "scheduled formation region” or the “scheduled formation region”, and is a virtual region in the plate material before the actual punching process is performed. It can be said that the "location corresponding to " is like a design drawing for a plate material.
  • the portion 2P corresponding to the yoke portion includes a portion 23P corresponding to the teeth portion extension region 23 and a portion 24P corresponding to the teeth portion non-extension area 24. Similar to the teeth portion extension region 23 and the teeth portion non-extension region 24 in the yoke portion 2 of the comb-shaped sheet 4, the portion 2P corresponding to the yoke portion in the plate material 40 includes the portion 23P and the teeth portion corresponding to the teeth portion extension region. The locations 24P corresponding to the non-extension region are alternately present.
  • the overhang portion 2A is formed between the portion 26P corresponding to the inner peripheral end 26 and the center line CP.
  • the inner peripheral end 26 is the first end 21. Therefore, as shown in FIG. 4, in the plate material 40, the portion 26P corresponding to the inner peripheral end 26 in the width direction W of the yoke portion 2 is the portion 21P corresponding to the first end 21.
  • the portion 26P corresponding to the inner peripheral end in the width direction W of the yoke portion 2 is the portion corresponding to the second end. It is 22P.
  • the case where the outer peripheral end 25 is the second end 22 will be described, but the same applies to the case where the outer peripheral end 25 is the first end 21.
  • the center line CP is a virtual line that divides the width of the portion 2P corresponding to the yoke portion into two.
  • an overhang portion 2A is formed between the center line CP and the portion 26P corresponding to the inner peripheral end at the portion 23P corresponding to the tooth portion extension region.
  • the overhanging portion 2A may be formed so that a part thereof is arranged between the center line CP and the portion 26P corresponding to the inner peripheral end.
  • the overhanging portion 2A may be formed on the portion 25P side corresponding to the outer peripheral end beyond the center line CP, or may reach the portion 25P corresponding to the outer peripheral end.
  • the overhanging portion 2A is a portion overhanging in the plate thickness direction with respect to the periphery.
  • the size of the overhang width A 1 is determined, for example, according to the curvature at the time of winding. The larger the curvature, the larger the overhang width A 1 .
  • the overhang width A 1 is preferably 10% or more of the plate thickness and 50% or less of the plate thickness. In this case, the effect of forming the overhanging portion 2A can be sufficiently obtained, and the effect of suppressing the decrease in the plate thickness of the material due to the overhanging molding can be obtained.
  • the overhang width A 1 is the maximum width of the portion overhanging from the periphery in the plate thickness direction.
  • the shape of the overhanging portion 2A is not particularly limited, and can be, for example, a shape as shown in FIGS. 6A to 6D. 6 (a) to 6 (d) show the shape of the plate material when viewed from the thickness direction.
  • the length A 2 of the overhanging portion 2A in the width direction W of the yoke portion 2 is preferably 2.0 mm or more and the width W 1 or less of the yoke portion 2.
  • the effect of forming the overhanging portion 2A can be sufficiently obtained, and the bending resistance due to the presence of the tooth portion 3 can be reduced.
  • it is more preferable that the length A 2 of the overhanging portion 2A is 1 ⁇ 2 or less of the width of the yoke portion 2.
  • the length A 2 of the overhanging portion 2A is the maximum length of the overhanging portion 2A in the width direction W.
  • the width W 1 of the yoke portion 2 is usually 2 to 30 mm.
  • the length A 3 of the overhanging portion 2A in the extending direction L of the yoke portion 2 is preferably 1.5 mm or more, and is preferably not more than the length L 1 of the teeth portion extending region 23 in the extending direction L of the yoke portion 2.
  • the effect of forming the overhanging portion 2A can be sufficiently obtained, and tensile stress can be applied to the tooth portion extending region 23.
  • the length A 3 of the overhanging portion 2A is more preferably 1/2 or less of L 1.
  • the length A 3 of the overhanging portion 2A is the maximum length of the overhanging portion 2A in the extending direction L.
  • the length L 1 of the tooth portion extension region 23 in the extension direction L of the yoke portion 2 is, for example, 2 to 20 mm.
  • a comb-shaped sheet 4 on which the overhanging portion 2A is formed can be obtained by performing a sheet forming step after the overhang molding step.
  • the yoke portion 2 of the comb-shaped sheet 4 is curved in the width direction W and laminated while being spirally wound.
  • the winding is performed by rolling the yoke portion 2 of the comb-shaped sheet 4.
  • the amount of extension of the yoke portion 2 in the extension direction L increases from the first end 21 to the second end 22 in the width direction W. By rolling in this way, it is curved in the width direction W and wound.
  • the amount of extension of the yoke portion 2 in the extension direction L increases from the second end 22 to the first end 21 in the width direction W. By rolling so as to be, it is curved in the width direction W and wound.
  • Rolling of the yoke portion 2 can be performed by sandwiching the yoke portion 2 between a pair of rollers 513 and 514.
  • the molding step is performed on the comb-shaped sheet 4 on which the overhanging portion 2A is formed.
  • the overhanging portion 2A is easily expanded by rolling, so that it is easily stretched.
  • the overhanging portion 2A is crushed and expanded, so that the overhanging portion 2A is formed at a position higher than the non-forming position of the overhanging portion. Easy to extend.
  • the plate material 40 of the yoke portion 2 is pulled and stretched in the circumferential direction, but usually, the presence of the teeth portion 3 becomes resistance to stretching in the teeth portion extension region 23.
  • the overhanging portion 2A is formed in the predetermined region of the teeth portion extending region 23, the overhanging portion 2A is expanded by rolling even if the teeth portion 3 is present. Therefore, the teeth portion extension region 23 is wound with the same elongation as the teeth portion non-extension region 24.
  • the rotary machine core 1 can be manufactured, for example, on the production line 6 shown in FIG.
  • the production line 6 includes an unwinding machine 61, a preforming machine 62, a press machine 64, a buffer device 65, and a molding machine 5.
  • the plate material 40 which is the material of the rotary machine core 1, is unwound by the unwinding machine 61 from the coiled state and supplied to the preforming machine 62.
  • the plate material 40 is an electromagnetic steel plate.
  • the preforming machine 62 includes a pair of cylindrical rollers 621 and 622 that sandwich the plate material 40 supplied from the unwinding machine 61 in the thickness direction. By being sandwiched between the first roller 621 and the second roller 622 of the preforming machine 62, the plate material 40 can be preformed. Specifically, as shown in the modified example 1 described later, as the first roller 621 and the second roller 622, a pair of rollers having a convex tooth surface 621a and a concave tooth surface 622a having shapes corresponding to the overhanging portion 2A, respectively. Can be used to form the overhanging portion 2A. The overhanging portion 2A can also be formed in the press machine 64, and in this case, the preforming machine 62 can be omitted from the production line 6.
  • the press machine 64 lowers the lower die 642 provided on the bolster 641, the upper die 644 provided on the slide 643, and the plate material 40 supplied from the unwinding machine 61 or the preforming machine 62.
  • a feeding device 645 that intermittently feeds between the mold 642 and the upper mold 644 is provided.
  • the upper mold 644 can be reciprocated so as to approach and separate from the lower mold 642.
  • an overhanging portion 2A is formed on the plate material 40, and the plate material 40 is further punched to form a comb shape.
  • the press machine 64 is a device that carries out an overhang forming step of forming the overhanging portion 2A on the plate material 40 and a step of punching the comb-shaped sheet 4 from the plate material 40 (that is, a sheet forming step).
  • the lower die 642 and the upper die 644 as shown in FIG. 10 are used.
  • the upper die 644 has a punch 644a and a presser 644b.
  • the lower die 642 has a holding portion 642a and a hole 642b through which the punch 644a can pass.
  • the press machine 64 is provided with a lower die and an upper die for punching the comb-shaped sheet 4, and the comb-shaped sheet 4 is formed by these dies.
  • the buffer device 65 accommodates the comb-shaped sheet 4 intermittently supplied from the press machine 64, and continuously supplies the accommodated comb-shaped sheet 4 to the molding machine 5.
  • the molding machine 5 includes a bending device 51 and a winding device 57.
  • the bending device 51 includes a motor 52, a speed reducer 53 connected to the output shaft of the motor 52, and a cylindrical roller 513 connected to the output member of the speed reducer 53. It includes a taper roller 514 that is rotatably provided at a position adjacent to the cylindrical roller 513, and a load control device 56 that can move the taper roller 514 in a direction that approaches and separates from the cylindrical roller 513.
  • the cylindrical roller 513 and the taper roller 514 roll the yoke portion 2 of the comb-shaped sheet 4 supplied from the buffer device 65.
  • the load control device 56 controls the load acting on the comb-shaped sheet 4 from the taper roller 514 to a predetermined value.
  • the gap between the cylindrical roller 513 and the taper roller 514 gradually decreases from the first end 21 to the second end 22 of the yoke portion 2 of the comb-shaped sheet 4.
  • the yoke portion 2 of the comb-shaped sheet 4 is rolled so that the amount of elongation in the extending direction L increases from the inner peripheral end 26 to the outer peripheral end 25, and is bent so as to be curved in the width direction W.
  • the winding device 57 spirally winds the comb-shaped sheet 4 rolled by the bending device 51 around the winding shaft 58 and stacks the sheets.
  • the molding machine 5 is a device that is responsible for a molding process in which the yoke portion 2 of the comb-shaped sheet 4 is bent so as to be curved in the width direction W and then spirally wound and laminated. The laminate is separated from the comb-shaped sheet 4 when the axial length reaches a predetermined value. After that, the spiral rotary machine core 1 is obtained through various finishing steps performed as needed. As described above, the rotary machine core 1 can be manufactured by continuously performing the overhang molding step, the sheet forming step, and the molding step.
  • the overhang portion 2A is formed in the overhang molding step. Specifically, in the portion 23P of the plate material 40 corresponding to the tooth portion extension region 23 of the yoke portion 2, the overhanging portion 2A is provided between the portion 26P corresponding to the inner peripheral end 26 of the yoke portion 2 and the center line CP.
  • the central line CP is a line that divides the portion 2P of the plate material 40 corresponding to the yoke portion 2 into two in the width direction W.
  • FIG. 4 the region between the center line CP and the portion 26P corresponding to the inner peripheral end in the portion 23P corresponding to the tooth portion extension region 23 is shown with a diagonal line.
  • the overhanging portion 2A When the overhanging portion 2A is not formed, the presence of the teeth portion 3 becomes a resistance to bending of the yoke portion 2 in the molding process. Therefore, the tooth portion extension region 23 in the yoke portion 2 is difficult to extend. In particular, the inside of the yoke portion 2 is less likely to extend than the center line C that divides the yoke portion 2 into two in the width direction W. As in this embodiment, by forming the overhanging portion 2A between the inner peripheral end 26 of the yoke portion 2 and the center line C in the tooth portion extension region 23 before the molding step, the overhanging portion 2A is formed in the molding step. The overhanging portion 2A is crushed by rolling.
  • the teeth portion extension region 23 is likely to be stretched in the same manner as the teeth portion non-extension region.
  • the amount of elongation of the inner peripheral side I of the yoke portion 2 is made substantially uniform in the teeth portion extension region 23 and the teeth portion non-extension region 24. Therefore, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process.
  • the rotary machine core 1 fits within the predetermined dimensions as designed, it is possible to prevent the rotary machine core 1 from being unable to be assembled to the housing of the rotary electric machine, for example. Further, it is possible to prevent a step from being generated on the inner surface and the outer surface of the rotary machine core 1. Therefore, for example, it is possible to prevent a gap from being generated in the magnetic circuit of the rotating electric machine to reduce the magnetic characteristics, or to reduce the fixing force of the rotating machine core 1 to generate vibration and abnormal noise.
  • the teeth portion non-extension region 24 is more easily stretched in the molding process than the teeth portion extension region 23, it is necessary to form an overhanging portion 2A at the portion 24P corresponding to the teeth portion non-extension region 24 of the plate material 40. There is no. That is, the overhanging portion non-forming portion 21A can be provided at the portion 24P corresponding to the teeth portion non-extension region 24.
  • the overhanging portion non-forming portion 21A is a portion where the overhanging portion is not formed.
  • Modification example 1 In this example, an example in which the overhanging portion 2A is formed by the rollers 621 and 622 of the preforming machine 62 will be described.
  • the same reference numerals as those used in the above-described embodiments represent the same components and the like as those in the above-mentioned embodiments, unless otherwise specified.
  • the preforming machine 62 of this example has a gear-shaped first roller 621 and a second roller 622 that are fitted to each other.
  • the overhanging portion 2A is formed by sandwiching the plate member 40 between the convex tooth surface 621a and the concave tooth surface 622a of the first roller 621.
  • the overhanging portion 2A is formed by the preforming machine 62 as in this example, it is not necessary to form the overhanging portion 2A by the press machine 64. Therefore, in the press machine 64, the comb-shaped sheet 4 is punched out. Will be done.
  • the rotary machine core 1 can be manufactured in the same manner as in the first embodiment, and the manufacturing method of this example also produces the same effect as that of the first embodiment.
  • Modification 2 This example is an example in which the order of the overhang molding step and the sheet forming step in the first embodiment is changed. That is, the rotary machine core 1 is manufactured by sequentially performing the sheet forming step, the overhang molding step, and the molding step. As shown in FIG. 14, first, a long comb-shaped sheet 4 having a yoke portion 2 and a teeth portion 3 is punched out from the plate material 40.
  • the yoke portion 2 has a teeth portion extension region 23 and a teeth portion non-extension region 24.
  • the teeth portion extension region 23 is a region in the yoke portion 2 in which the teeth portion 3 extending from the yoke portion 2 is formed.
  • the teeth portion non-extension region 24 is a region in the yoke portion 2 in which the teeth portion 3 extending from the yoke portion 2 is not formed.
  • the teeth portion extension region 23 and the teeth portion non-extension region 24 are alternately present in the extension direction L.
  • the overhanging portion 2A is formed in the teeth portion extending region 23 between the center line C in the width direction W of the yoke portion 2 and the inner peripheral end 26 of the yoke portion 2.
  • FIG. 15 the region between the center line C and the inner peripheral end 26 in the tooth portion extension region 23 is shown with diagonal lines.
  • the rotary machine core 1 can be manufactured by performing the molding process in the same manner as in the first embodiment. Even if the order of the overhang molding step and the sheet forming step is changed as in this example, the overhanging portion 2A is formed on the comb-shaped sheet 4 before the forming step, so that the same effect as that of the first embodiment can be obtained. Be done.
  • Embodiment 2 A mode in which the groove portion 2B is formed at the portion 24P corresponding to the tooth portion non-extension region 24 of the plate material 40 will be described.
  • the shape is the same as that of the first embodiment except that the overhanging portion 2A is not formed in the tooth portion extension region 23 and the groove portion 2B is provided in the tooth portion non-extension region 24.
  • the rotating machine core 1 of the above is manufactured. It is not necessary to form the groove portion 2B in the tooth portion extension region 23. That is, the groove portion non-forming portion 21B can be provided in the tooth portion extension region 23.
  • the groove portion non-forming portion 21B is a portion where the groove portion 2B is not formed.
  • the rotary machine core 1 is manufactured by the following procedure after performing a groove forming step, a sheet forming step, and a forming step.
  • the groove portion 2B may be formed on the comb-shaped sheet 4 after the sheet is formed, or may be formed on the plate material 40 before the sheet forming step. That is, it is sufficient that the groove portion 2B is formed before the molding process. In this embodiment, a case where the groove portion 2B is formed with respect to the plate material 40 will be described.
  • the groove portion 2B is formed in the plate material 40.
  • the groove portion 2B is formed at the portion 24P corresponding to the teeth portion non-extension region 24 in the portion 2P corresponding to the yoke portion 2 of the plate material 40.
  • the groove portion 2B is not formed in the portion 23P corresponding to the tooth portion extension region 23. That is, the groove non-forming portion 21B exists in the portion 23P corresponding to the tooth portion extension region 23.
  • the groove portion 2B is formed along the extension direction L (that is, the longitudinal direction L) of the yoke portion 2. In other words, the groove portion 2B extends along a direction orthogonal to the extending direction of the teeth portion 3.
  • the formation of the groove portion 2B suppresses the elongation of the tooth portion non-extending region 24 in the circumferential direction during winding in the molding process.
  • the length of the groove 2B in the extension direction L of the yoke portion 2 becomes larger, the elongation of the tooth portion non-extension region 24 in the circumferential direction is suppressed. Therefore, the length of the groove 2B depends on, for example, the curvature at the time of winding. It is determined.
  • the length of the groove portion 2B can be increased as the curvature increases.
  • the groove portion 2B is formed in the teeth portion non-extension region 24, but both ends of the groove portion 2B may reach the teeth portion extension region 23. However, it is preferable that the groove non-forming portion 21B is present in the tooth portion extension region 23.
  • the portion 23P corresponding to the teeth portion extension region 23 and the portion 24P corresponding to the teeth portion non-extension area 24 are alternately present.
  • Grooves 2B may be formed in all the portions 24P corresponding to the teeth portion non-extension region 24, or groove portions 2B may be formed in a part of the portions 24P corresponding to the teeth portion non-extension region 24. That is, a groove non-forming portion in which the groove 2B is not formed may be provided in a part of the portion 24P corresponding to the tooth portion non-extension region 24.
  • One groove portion 2B may be formed in each tooth portion non-extension region 24, or a plurality of groove portions 2B may be formed. When two or more groove portions 2B are formed, for example, groove portions 2B parallel to each other can be formed.
  • the length B 1 of the groove portion 2B in the extending direction L of the yoke portion 2 is preferably 3.0 mm or more and not more than the slot width.
  • the teeth portion non-extension region 24 can be increased to the same deformation resistance as the teeth portion extension region 23.
  • the length B 1 of the groove portion 2B is more preferably equal to or less than the slot width.
  • the slot width is the width of the teeth portion non-extension region 24.
  • the length B 2 of the groove portion 2B in the width direction W of the yoke portion 2 is, for example, about 0.1 mm.
  • the lengths B 1 and B 2 of the groove 2B are the maximum lengths in each direction.
  • the depth B 3 of the groove 2B is preferably 30% or less of the plate thickness.
  • the groove is filled after the winding molding, and the generation of a gap can be suppressed.
  • the depth B 3 of the groove 2B is more preferably 30% or less of the plate thickness, and further preferably not more than the depth of the same ratio as the curvature with respect to the plate thickness. ..
  • the depth B 3 of the groove 2B is the maximum depth of the groove 2B.
  • One groove portion 2B may be formed in the portion 24P corresponding to each tooth portion non-extension region 24, but two or more grooves may be formed.
  • two or more groove portions 2B are formed, for example, two or more groove portions 2B having a parallel relationship with each other can be formed.
  • the number of groove portions 2B is determined according to, for example, the curvature during winding. Will be done. The larger the curvature, the more the number of grooves 2B can be increased.
  • the number of groove portions 2B formed in the portion 24P corresponding to the tooth portion non-extension region 24 can be increased.
  • the groove portion 2B is formed at the portion 24P corresponding to the teeth portion non-extension region 24.
  • the groove portion 2B is formed on the outer peripheral side O (specifically, the portion 25P side corresponding to the outer peripheral end 25) with respect to the center line CP at the portion 24P corresponding to the teeth portion non-extension region. It is preferable to be done. In this case, the effect of suppressing the elongation by the groove portion 2B is improved. This is because the non-extended region 24 of the teeth portion tends to extend during winding on the outer peripheral side O of the center line C (see FIG. 19A).
  • the groove portion 2B is formed at a portion that is more easily stretched, the effect of suppressing the elongation due to the formation of the groove portion 2B is improved. Further, during winding in the molding process, the amount of elongation increases toward the outer peripheral side O of the yoke portion 2, so that the closer the position where the groove portion 2B is formed to the outer peripheral side O in the width direction W, the longer the length of the groove portion 2B. It is preferable to do so.
  • the cross-sectional shape of the groove portion 2B is not particularly limited, but can be, for example, the shape shown in FIGS. 20A to 20C. 20 (a) to 20 (c) show the cross section of the groove portion 2B in the width direction W in the yoke portion.
  • the sheet forming step and the forming step can be performed as in the first embodiment.
  • the rotary machine core 1 can be manufactured. Similar to the first embodiment, the rotary machine core 1 of the present embodiment is manufactured by a production line 6 composed of, for example, an unwinding machine 61, a preforming machine 62, a press machine 64, a buffer device 65, and a forming machine 5. ..
  • the groove forming step can be performed by, for example, a press machine 64.
  • the press machine 64 has a lower die 642 and an upper die 644.
  • the upper mold 644 has a molding portion 644c and a pressing portion 644d.
  • a plurality of groove-forming convex portions 644e are formed on the contact surface of the molded portion 644c with the plate material 40.
  • the groove-forming convex portion 644e has a shape that fits the shape of the groove portion 2B.
  • the lower mold 642 is composed of a holding base 642c.
  • the plate material 40 is held between the holding portion 644d of the upper mold 644 and the holding base 642c of the lower mold 642 while being narrowed.
  • the groove portion 2B is formed on the plate material 40 by the groove forming convex portion 644e of the molding portion 644c.
  • FIGS. 21 (a) and 21 (b) by using the molded portion 644c in which a large number of groove forming convex portions 644e are formed, a large number of groove portions can be formed by one press.
  • the press machine 64 includes a lower die 642 and an upper die 644 for punching the comb-shaped sheet 4, and the comb-shaped sheet 4 is formed by these dies.
  • the other configurations of the production line are the same as those in the first embodiment, and the rotary machine core 1 can be manufactured in the same manner as in the first embodiment.
  • the comb-shaped sheet 4 before the molding step has a groove portion 2B in the teeth portion non-extension region 24.
  • the teeth portion non-extension region 24 in which the groove portion 2B is formed is less likely to be stretched by rolling in the molding step than in the case where the groove portion 2B is not formed. That is, when the groove portion 2B is not formed, the teeth portion non-extension region 24 is more easily stretched than the teeth portion extension region 23, but is less likely to be stretched by forming the groove portion 2B.
  • the elongation of the teeth portion non-extension region 24 and the teeth portion extension region 23 is substantially made uniform during rolling in the molding process. Therefore, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process. As a result, for example, it is possible to prevent the rotary machine core 1 from being unable to be assembled to the housing of the rotary electric machine. Further, since it is possible to prevent a step from being generated on the inner surface and the outer surface of the rotating machine core 1, it is possible to prevent the magnetic characteristics from being deteriorated and the vibration and abnormal noise from being generated.
  • the preforming machine 62 of this example has a first roller 621 and a second roller 622.
  • the first roller 621 has a convex portion 621c for forming a groove on the roller surface 621b.
  • the second roller 622 has a cylindrical shape, and the roller surface is flat.
  • the groove portion 2B is formed by sandwiching the plate material 40 between the convex portion 621c formed on the roller surface 621b of the first roller 621 and the second roller 622.
  • the rotary machine core 1 can be manufactured in the same manner as in the second embodiment.
  • Modification example 4 This example is an example in which the order of the groove forming step and the sheet forming step in the first embodiment is changed. As shown in FIG. 23, first, the comb-shaped sheet 4 having the yoke portion 2 and the teeth portion 3 is punched out from the plate material 40.
  • a groove portion 2B is formed in the yoke portion 2 of the comb-shaped sheet 4.
  • the yoke portion 2 has a teeth portion extension region 23 and a teeth portion non-extension region 24.
  • the groove portion 2B is formed in the teeth portion non-extension region 24 of the yoke portion 2.
  • the groove portion 2B can be formed in the same manner as in the second embodiment and the third modification.
  • the overhanging portion 2A is formed on the comb-shaped sheet 4 before the forming step, so that the same effect as that of the second embodiment can be obtained. ..
  • the rotary machine core 1 of the present embodiment has a notch 29 on the side surface of the outer peripheral side O.
  • the notch portion 29 is formed in the yoke portion 2.
  • the notch portion 29 is a portion of the rotating machine core 1 that is recessed in a direction orthogonal to the circumferential direction X (that is, the radial direction Y).
  • the width of the yoke portion 2 is smaller than that of the periphery.
  • the shape of the notch 29 is not particularly limited.
  • the notch portion 29 is formed on the outer peripheral side O of the yoke portion 2, but it can also be formed on the inner peripheral side I. In other words, in FIGS. 25 and 26, the notch portion 29 is formed at the second end 22 of the yoke portion 2, but it can also be formed at the first end 21.
  • the notch portion 29 is formed in, for example, the teeth portion extension region 23 and the teeth portion non-extension region 24 in the yoke portion 2. As shown in FIGS. 26 and 27, when the notch portion 29 is formed in the teeth portion non-extension region 24 and the groove portion 2B is formed in the teeth portion non-extension region 24, the notch portion is formed. It is preferable to form more groove portions 2B in the teeth portion non-extension region 24 in which the 29 is formed than in the teeth portion non-extension region 24 in which the notch portion 29 is not formed.
  • the rotary machine core 1 of this embodiment is manufactured by performing a sheet forming step, a groove forming step, and a forming step.
  • the notch is formed, for example, in the sheet forming step. Specifically, in the sheet forming step, the comb-shaped sheet 4 having the notch portion 29 at the outer peripheral end 25 in the teeth portion non-extension region 24 of the yoke portion 2 is punched out. That is, the comb-shaped sheet 4 having the yoke portion 2, the teeth portion 3, and the notch portion 29 is punched out.
  • the groove forming step for example, two groove portions 2B are formed in the tooth portion non-extension region 24 in which the notch portion 29 is formed in the comb-shaped sheet 4, and the teeth portion non-extension region 24 in which the notch portion 29 is not formed is formed. Can form one groove 2B.
  • the elongation of the tooth portion non-extension region 24 in the circumferential direction X is substantially equal to the position where the notch portion 29 is formed or the position where the notch portion 29 is not formed. It is suppressed uniformly.
  • the elongation of the teeth portion non-extension region 24 and the teeth portion extension region 23 is substantially made uniform during rolling in the molding process.
  • even when the notch portion 29 is formed it is possible to reduce the variation in diameter dimension that may occur during spiral winding in the molding process.
  • the length B 1 of the groove portion 2B is the length of the yoke portion 2 in the extending direction L.
  • the length C 1 of the notch portion 29 in the extending direction L of the yoke portion 2 and the length C 2 of the notch portion in the width direction W of the yoke portion 2 can be appropriately adjusted.
  • Length C 1 and length C 2 are the maximum lengths of the notches in each direction. The larger the length C 1 and the length C 2 of the notch portion 29, the easier it is for the yoke portion 2 to extend at the position where the notch portion 29 is formed. Therefore, it is preferable to increase the length B 1 of the groove portion as the length C 1 and the length C 2 of the notch portion 29 become larger.
  • both ends of the notch portion 29 may also reach the teeth portion extension region 23. Further, the notch portion 29 and the groove portion 2B may overlap.
  • the groove portion 2B can be formed by the press machine 64 as in the second embodiment. Further, the groove portion 2B can also be formed by the preforming machine 62 as in the modified example 3.
  • the sheet forming process and the groove forming process can be interchanged. That is, as in the second embodiment, the sheet forming step can be performed after the groove forming step.
  • the portion 24P of the plate material 40 corresponding to the teeth portion non-extension region 24 in which the notch portion 29 is formed is more than the portion 24P corresponding to the teeth portion non-extension region 24 in which the notch portion 29 is not formed.
  • Many grooves 2B may be formed.
  • FIG. 29 A form in which the thin-walled portion 2C is formed at the portion 24P corresponding to the tooth portion non-extension region 24 of the plate material 40 will be described.
  • the overhanging portion 2A is not formed in the tooth portion extension region 23 and the thin-walled portion 2C is provided in the tooth portion non-extension region 24.
  • a rotating machine core 1 having a shape is manufactured.
  • the thin portion 2C of the tooth portion non-extension region 24 is a portion having a thickness smaller than the periphery.
  • the thin portion 2C is a portion having a thickness smaller than, for example, the teeth portion extension region 23.
  • the tooth portion extension region 23 can be provided with a thin-walled portion non-forming region.
  • the thin-walled portion non-formed region is a region in which the thin-walled portion is not formed.
  • the rotary machine core 1 is manufactured by the following procedure after performing a thinning step, a sheet forming step, and a molding step.
  • the thin portion 2C may be formed on the comb-shaped sheet 4 after the sheet is formed, or may be formed on the plate material 40 before the sheet forming step. That is, it suffices that the thin-walled portion 2C is formed before the molding step. In this embodiment, a case where the thin portion 2C is formed with respect to the plate material 40 will be described.
  • the thinned portion 2C is formed on the plate material 40.
  • the thin portion 2C can be formed, for example, by crushing the plate material 40.
  • the thin-walled portion 2C is formed at the portion 24P corresponding to the teeth portion non-extension region 24 in the portion 2P corresponding to the yoke portion 2 of the plate material 40.
  • the thin portion 2C is not formed at the portion 23P corresponding to the tooth portion extension region 23. That is, the thin-walled portion non-forming region exists in the portion 23P corresponding to the tooth portion extension region 23.
  • the thin part 2C is a part with a small plate thickness.
  • less material is crushed by rolling in the molding process. Therefore, in the teeth portion non-extension region 24 in which the thin-walled portion 2C is formed, the elongation in the circumferential direction X is suppressed as compared with the teeth portion extension region 23.
  • the thickness of the thin-walled portion 2C becomes smaller, the amount crushed in the molding process is reduced and the elongation is suppressed. Therefore, the thickness of the thin-walled portion 2C is determined, for example, according to the curvature at the time of winding. As the curvature increases, the difference in elongation between the teeth portion extension region 23 and the teeth portion non-extension region 24 tends to increase. Therefore, the thickness of the thin portion 2C can be reduced as the curvature increases.
  • the portion 2P corresponding to the yoke portion 2 has a portion 23P corresponding to the teeth portion extension region 23 and a portion 24P corresponding to the teeth portion non-extension area 24 alternately.
  • thin-walled portions 2C may be formed at all locations 24P corresponding to the teeth portion non-extension region 24, but although not shown, they correspond to the teeth portion non-extension region 24.
  • a thin portion 2C may be formed in a part of the portion 24P.
  • a thin-walled portion 2C may be formed at each portion 24P corresponding to the teeth portion non-extension region 24, or a thin-walled portion non-forming portion is provided at a part of the portion 24P corresponding to the teeth portion non-extension region 24. You may.
  • the thin-walled portion non-formed portion is a portion where the thin-walled portion 2C is not formed.
  • a thin-walled portion non-forming portion 21C can be formed in the teeth portion extension region 23 and the portion 23P corresponding to the teeth portion extension region 23. Further, the thin-walled portion non-forming portion 21C can also be formed at the teeth portion 3 and the portion 3P corresponding to the teeth portion 3.
  • a vertical surface may be provided or an inclined surface may be provided at the boundary between the thin-walled portion 2C and the thin-walled portion non-forming portion 21C.
  • an inclined surface can be provided at the boundary between the thin-walled portion 2C and the thin-walled portion non-forming portion 21C.
  • the thickness D 1 in the thin portion 2C is preferably 70% or more of the plate thickness of the plate material 40.
  • the thickness reduction width D 2 in the thin portion 2C is preferably 30% or less of the plate thickness T 1 of the plate material 40.
  • the thickness D 1 in the thin portion 2C is more preferably 90% or more of the plate thickness T 1 of the plate material 40.
  • the thickness D 1 is the minimum thickness in the thin portion 2C, and the thickness reduction width D 2 is the maximum width.
  • the plate thickness T 1 of the plate material 40 is the original thickness of the plate material 40 before the thinning step, for example, the thickness of the thin-walled portion non-forming portion 21C.
  • the sum of the thickness D 1 and the reduced width D 2 is the plate thickness T 1 of the plate material 40.
  • the thickness reduction width D 2 is, for example, 0.01 mm or more, and the plate thickness T 1 of the plate material 40 before the thinning step is, for example, 0.35 to 0.50 mm.
  • the length D 3 of the thin portion 2C in the extending direction L of the yoke portion 2 in the comb-shaped sheet 4 is preferably not more than the slot width.
  • the crushing amount ratio of the outer peripheral end 25 side of the yoke portion 2 and the inner peripheral end 26 side of the yoke portion 2 in winding molding is made equal to that of the teeth portion extension region 23. can do.
  • the length D 4 of the thin wall portion 2C in the width direction W of the yoke portion 2 is preferably 1 ⁇ 2 or more of the width of the yoke portion 2 and not more than the width of the yoke portion 2 from the outer peripheral end 25 side.
  • the crushing amount ratio on the outer peripheral end 25 side of the yoke portion 2 having a large crushing amount can be reduced to reduce the curvature.
  • the lengths D 3 and D 4 are the maximum lengths of the thin portion 2C in each direction.
  • the cross-sectional shape of the thin-walled portion 2C is not particularly limited, and can be, for example, a shape as shown in FIGS. 33 (a) to 33 (c).
  • FIGS. 33 (a) to 33 (c) show a cross section of the thin-walled portion 2C in the direction along the extending direction L of the strip-shaped yoke portion 2 or the portion 2P corresponding to the strip-shaped yoke portion 2.
  • the sheet forming step and the molding step can be performed as in the first embodiment.
  • the rotating machine core can be manufactured. Similar to the first embodiment, the rotary machine core 1 of the present embodiment is manufactured by a production line 6 composed of, for example, an unwinding machine 61, a preforming machine 62, a press machine 64, a buffer device 65, and a forming machine 5. ..
  • the thinning step can be performed by, for example, a press machine 64.
  • the press machine 64 has a lower die 642 and an upper die 644.
  • the upper mold 644 has a molding portion 644f and a pressing portion 644d.
  • a plurality of thin-walled portion forming convex portions 644 g are formed on the contact surface of the molded portion 644f with the plate material 40.
  • the thin-walled portion forming convex portion 644 g has a shape that fits the shape of the thin-walled portion 2C.
  • the lower mold 642 is composed of a holding base 642c.
  • the thin-walled portion 2C is formed by the convex portion 644g for forming the thin-walled portion of the portion 644f.
  • a large number of thin-walled portions 2C can be formed in one press by using the molded portion 644f in which a large number of thin-walled portion forming convex portions 644 g are formed. it can.
  • the press machine 64 includes a lower die 642 and an upper die 644 for punching the comb-shaped sheet 4, and the comb-shaped sheet 4 is formed by these dies. ..
  • the other configurations of the production line are the same as those in the first embodiment, and the rotary machine core 1 can be manufactured in the same manner as in the first embodiment.
  • the thin wall portion 2C is formed at the portion 24P corresponding to the tooth portion non-extension region 24 in the thinning step. Therefore, the comb-shaped sheet 4 before the molding step has a thin-walled portion 2C in the teeth portion non-extension region 24.
  • the teeth portion non-extension region 24 in which the thin-walled portion 2C is formed has less material to be stretched by rolling than the teeth portion extension region 23, and therefore is less likely to be stretched during rolling in the forming step. As a result, the elongation of the teeth portion non-extension region 24 and the teeth portion extension region 23 is substantially made uniform during rolling in the molding step.
  • the preforming machine 62 of this example has a first roller 621 and a second roller 622.
  • the first roller 621 has a convex portion 621d for forming a thin wall portion on the roller surface 621b.
  • the second roller 622 has a cylindrical shape as in the modified example 3, and the roller surface is flat.
  • the thin portion 2C is formed by sandwiching the plate material 40 between the convex portion 621d formed on the roller surface 621b of the first roller 621 and the second roller 622.
  • the rotary machine core 1 can be manufactured in the same manner as in the fourth embodiment.
  • Modification 6 This example is an example in which the order of the thinning step and the sheet forming step in the first embodiment is changed. As shown in FIG. 36, first, the comb-shaped sheet 4 having the yoke portion 2 and the teeth portion 3 is punched out from the plate material 40.
  • a thin portion 2C is formed on the yoke portion 2 of the comb-shaped sheet 4.
  • the yoke portion 2 has a teeth portion extension region 23 and a teeth portion non-extension region 24.
  • the thin portion 2C is formed in the teeth portion non-extension region 24 of the yoke portion 2.
  • the thin-walled portion 2C can be formed in the same manner as in the fourth embodiment and the fifth modification. Note that FIG. 37 shows the comb-shaped sheet 4 before the thin-walled portion 2C is formed.
  • the thinning portion 2C is formed on the comb-shaped sheet 4 before the forming step, so that the same effect as that of the fourth embodiment can be obtained.
  • the rotary machine core 1 of this embodiment is manufactured by the following procedure after performing a sheet forming step, a groove forming step, and a forming step.
  • the groove portion 2B may be formed on the comb-shaped sheet 4 after the sheet is formed, or may be formed on the plate material 40 before the sheet forming step. That is, it is sufficient that the groove portion 2B is formed before the molding process. In this embodiment, a case where the groove portion 2B is formed on the comb-shaped sheet 4 will be described.
  • the comb-shaped sheet 4 having the yoke portion 2, the teeth portion 3 and the notch portion 29 is punched out from the plate material 40 as in the third embodiment.
  • the notch portion 29 may be formed in the teeth portion non-extension region 24 of the yoke portion 2, or may be formed in the teeth portion extension region 23.
  • the notch portion 29 is formed at, for example, the outer peripheral end 25 of the yoke portion 2, but can also be formed at the inner peripheral end 26.
  • the notch portion 29 is formed at the second end 22 of the yoke portion 2, but it can also be formed at the first end 21.
  • the groove portion 2B is formed at the forming position of the notch portion 29 in the yoke portion 2 of the comb-shaped sheet 4.
  • the groove portions 2B may be formed at all the notch portions 29 forming positions, or the groove portions 2B may be formed at a part of the notch portions 29 forming positions. You may. Further, one groove portion 2B may be formed at the formation position of each notch portion 29, or a plurality of groove portions 2B may be formed as in the third embodiment.
  • the length B 1 of the groove portion 2B in the extension direction L of the yoke portion 2 can be adjusted as appropriate, but can be, for example, about the same as the length of the notch portion 29 in the extension direction L of the yoke portion 2.
  • the other dimensions of the groove portion 2B are the same as those in the second and third embodiments.
  • the groove portion 2B can be formed by the press machine 64 as in the second embodiment. Although the configuration is not shown, the groove portion 2B can be formed at the position where the notch portion 29 is formed by changing the interval between the groove forming convex portions 644e of the press machine 64. Further, similarly to the modification 3, the groove portion 2B can be formed by the rollers 321 and 622 of the preforming machine 62. Although the configuration is not shown, the groove 2B can be formed at the position where the notch 29 is formed by changing the distance between the convex portions 621c for forming the groove of the roller.
  • the rotary machine core 1 can be manufactured by performing the molding step in the same manner as in the first embodiment and winding the comb-shaped sheet 4.
  • the groove portion 2B is formed at the position where the notch portion 29 is formed in the comb-shaped sheet 4. Therefore, the comb-shaped sheet 4 before the molding step has a groove portion 2B at a position where the notch portion 29 is formed.
  • the groove portion 2B is formed in the yoke portion 2.
  • the yoke portion 2 in which the groove portion 2B is formed is less likely to be stretched during rolling in the molding process than the yoke portion 2 in which the groove portion 2B is formed.
  • the elongation of the yoke portion 2 in which the notch portion 29 is formed is suppressed, and the yoke portion 2 and the notch portion 29 are not formed at the position where the notch portion 29 is formed.
  • the elongation of the yoke portion 2 at the position is substantially made uniform. Therefore, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process.
  • Modification 7 This example is an example in which the order of the sheet forming step and the groove forming step in the fifth embodiment is changed. That is, the sheet forming step is performed after the groove forming step.
  • the groove portion 2B is formed at the portion 29P corresponding to the position where the notch portion 29 is formed in the plate material 40, and at the portion 2P corresponding to the yoke portion 2.
  • the groove portion 2B is formed at the portion 2P of the plate material 40 corresponding to the yoke portion 2 and at the planned formation position 29P of the notch portion 29 of the yoke portion 2.
  • the groove portion 2B may be formed at a portion 23P corresponding to the teeth portion extension region 23, or may be formed at a portion 24P corresponding to the teeth portion non-extension region 24, and the groove portion 2B may be formed at the portion 23P corresponding to the teeth portion extension region 23 and the teeth. It may be formed so as to straddle the portion 24P corresponding to the portion non-extension region 24.
  • the groove portion 2B can be formed by the press machine 64 and the preforming machine 62 as in the second embodiment and the second modification.
  • the comb-shaped sheet 4 having the tooth portion 3, the yoke portion 2, and the notch portion 29 is punched out. After that, by performing the molding step, the rotary machine core 1 similar to that of the fifth embodiment can be manufactured.
  • the rotary machine core 1 of this embodiment is manufactured by the following procedure after performing a sheet forming step, a thinning step, and a molding step.
  • the thin portion 2C may be formed on the comb-shaped sheet 4 after the sheet is formed, or may be formed on the plate material 40 before the sheet forming step. That is, it is sufficient that the thin portion 2C is formed before the molding step. In this embodiment, a case where the thin portion 2C is formed on the comb-shaped sheet 4 will be described.
  • the comb-shaped sheet 4 having the yoke portion 2, the teeth portion 3 and the notch portion 29 is punched out from the plate material 40 as in the third embodiment.
  • the notch portion 29 is the same as in the fifth embodiment.
  • the thinned portion 2C is formed at the position where the cutout portion 29 is formed in the yoke portion 2 of the comb-shaped sheet 4.
  • the thin-walled portion 2C may be formed at all the notch portions 29 forming positions, or the thin-walled portion 2C may be formed at a part of the forming positions of the notch portions 29. It may be formed.
  • the length D 3 of the thin wall portion 2C in the extension direction L of the yoke portion 2 can be adjusted as appropriate, but for example, it should be about the same as the length C 1 of the notch portion 29 in the extension direction L of the yoke portion 2. Can be done.
  • the thin-walled portion 2C may be formed in the teeth portion non-extension region 24, in the teeth portion extension region 23, or may be formed across these regions 23 and 24. The other dimensions of the thin portion 2C are the same as those in the fourth embodiment.
  • the thinned portion 2C can be formed by the press machine 64 as in the fourth embodiment.
  • the thin-walled portion 2C can be formed at the notch 29 forming position by changing the interval of the thin-walled portion forming convex portion 644 g of the press machine 64.
  • the thin portion 2C can be formed by the rollers 621 and 622 of the preforming machine 62.
  • the thin-walled portion 2C can be formed at the notched portion 29 formation position by changing the interval of the convex portion 621d for forming the thin-walled portion of the roller 621.
  • the rotary machine core 1 can be manufactured by performing a molding step as in the first embodiment and winding the comb-shaped sheet 4.
  • the thinning portion 2C is formed at the position where the notch portion 29 is formed in the comb-shaped sheet 4. Therefore, the comb-shaped sheet 4 before the molding step has a thin-walled portion 2C at a position where the notch portion 29 is formed.
  • the thin-walled portion 2C is formed in the yoke portion 2. Since the yoke portion 2 in which the thin-walled portion 2C is formed has less material to be stretched by rolling than the yoke portion 2 in which the thin-walled portion 2C is not formed, the yoke portion 2 is less likely to be stretched by rolling in the forming step.
  • Modification 8 This example is an example in which the order of the sheet forming step and the thinning step in the sixth embodiment is changed. That is, the sheet forming step is performed after the thinning step.
  • the thinning portion 2C is formed at the portion 29P corresponding to the position where the notch portion 29 is formed in the plate material 40, and at the portion 2P corresponding to the yoke portion 2. .. Specifically, the thin portion 2C is formed at the portion 2P of the plate material 40 corresponding to the yoke portion 2 and at the planned formation position 29P of the notch portion 29 of the yoke portion 2.
  • the thin-walled portion 2C may be formed at a portion 23P corresponding to the teeth portion extension region 23, or may be formed at a portion 24P corresponding to the teeth portion non-extension region 24, and may be formed at a portion 23P corresponding to the teeth portion extension region 23.
  • the thinned portion 2C can be formed by the press machine 64 and the preforming machine 62 as in the fourth embodiment and the fifth modification.
  • the comb-shaped sheet 4 having the tooth portion 3, the yoke portion 2, and the notch portion 29 is punched out. After that, by performing the molding step, the rotary machine core 1 similar to that of the sixth embodiment can be manufactured.
  • the present disclosure is not limited to each of the above embodiments and modifications, and can be applied to various embodiments without departing from the gist thereof.
  • the form and the example in which the teeth portion 3 is wound on the inside have been described, but the teeth portion 3 can be wound on the outside.
  • the rotary machine core 1 can be used for a stator core, a rotor core, and the like.

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Abstract

In the present invention, a sheet-forming step and a molding step are performed, and a projection-molding step, a groove-forming step, or a thinning step is performed. In the sheet-forming step, a comb-shaped sheet (4), which has a yoke part (2) extending in a flat, elongated shape and a plurality of teeth (3) extending from a first widthwise (W) end (21) of the yoke part (2), is punched out from a plate member (40). In the molding step, the yoke part (2) of the comb-shaped sheet (4) is layered while being curved in the width direction (W) and wound in a spiral shape. The projection-molding step, the groove-forming step, or the thinning step is performed before the molding step. In the projection-molding step, the groove-forming step, or the thinning step, each of a projection (2A), a groove part, or a thinned part is formed at a specific position of the comb-shaped sheet (4) or the plate member (40).

Description

回転機コアの製造方法How to manufacture the rotating machine core 関連出願の相互参照Cross-reference of related applications
　本出願は、２０１９年１１月８日に出願された日本出願番号２０１９－２０３０１３号に基づくもので、ここにその記載内容を援用する。 This application is based on Japanese application No. 2019-203013 filed on November 8, 2019, and the contents of the description are incorporated herein by reference.
　本開示は、螺旋状の回転機コアの製造方法に関する。 The present disclosure relates to a method for manufacturing a spiral rotating machine core.
　帯状に延びるヨーク部と、ヨーク部の幅方向の一端から延びる複数のティース部とを有する帯状シートを螺旋状に巻回させたステータコアが知られている。ステータコアは、例えば、帯状シートのヨーク部を幅方向に湾曲するように曲げた後に螺旋状に巻きつつ積層することによって製造される。この製造方法では、ヨーク部は、長手方向の伸び量が幅方向の一端部から他端部にかけて大きくなるように圧延することによって、幅方向に湾曲するように曲げられる。 A stator core in which a strip-shaped sheet having a yoke portion extending in a strip shape and a plurality of teeth portions extending from one end in the width direction of the yoke portion is spirally wound is known. The stator core is manufactured, for example, by bending the yoke portion of the strip-shaped sheet so as to be curved in the width direction, and then laminating the strip-shaped sheet while winding it spirally. In this manufacturing method, the yoke portion is bent so as to be curved in the width direction by rolling so that the amount of elongation in the longitudinal direction increases from one end portion to the other end portion in the width direction.
　螺旋状のステータコアでは、螺旋状に巻回するときに巻き径が積層方向においてばらつきが生じ易い。巻き径がばらつくと、ステータコアの外径が所定寸法内に収まらず、回転電機のハウジングに組み付けられなくなるおそれがある。また、巻き径のばらつきは、ステータコアの内面および外面に段差を生じさせる。その結果、回転電機の磁気回路にギャップが生まれ磁気特性が低下したり、ステータコアの固定力が低下し振動および異音が発生したりする。 In a spiral stator core, the winding diameter tends to vary in the stacking direction when spirally wound. If the winding diameter varies, the outer diameter of the stator core may not be within the predetermined dimensions and may not be assembled to the housing of the rotary electric machine. Further, the variation in the winding diameter causes a step on the inner surface and the outer surface of the stator core. As a result, a gap is created in the magnetic circuit of the rotating electric machine, the magnetic characteristics are lowered, the fixing force of the stator core is lowered, and vibration and abnormal noise are generated.
　特許文献１には、帯状シートのヨーク部、または、板材のうちヨーク部に対応する箇所に、ヨーク部の長手方向に延びる溝部を形成する方法が開示されている。特許文献１によれば、溝部を形成することにより、帯状シートを曲げた後に螺旋状に巻くときの巻き径のばらつきを抑制できるとしている。 Patent Document 1 discloses a method of forming a groove portion extending in the longitudinal direction of the yoke portion at a yoke portion of the strip-shaped sheet or a portion of the plate material corresponding to the yoke portion. According to Patent Document 1, by forming the groove portion, it is possible to suppress the variation in the winding diameter when the strip-shaped sheet is wound in a spiral shape after being bent.
特開２０１４－２２０９３９号公報Japanese Unexamined Patent Publication No. 2014-220939
　ヨーク部には、ヨーク部から延びるティース部が形成されたティース部延長領域と、ヨーク部から延びるティース部が形成されていないティース部非延長領域とが存在する。螺旋状の巻回時に、ティース部延長領域は曲がりにくく、ティース部非延長領域は曲がりやすい。また、例えば巻回時の位置決め用の切欠きのように、巻回前のヨーク部の幅方向の端部には、様々な目的、用途で切欠きが設けられることがある。ヨーク部は、切欠きが形成されていない位置よりも、切欠きが形成された位置の方が曲がりやすい。 The yoke portion has a teeth portion extension region in which a teeth portion extending from the yoke portion is formed and a teeth portion non-extension region in which a teeth portion extending from the yoke portion is not formed. At the time of spiral winding, the tooth portion extension region is difficult to bend, and the tooth portion non-extension region is easy to bend. Further, for example, a notch for positioning at the time of winding may be provided at the end portion in the width direction of the yoke portion before winding for various purposes and purposes. The yoke portion is more easily bent at the position where the notch is formed than at the position where the notch is not formed.
　このように、ヨーク部には曲がりやすい箇所と曲がりにくい箇所が存在する。そのため、ヨーク部を螺旋状に巻回させると、ヨーク部の曲がりやすさの違いによって径寸法にばらつきが生じる。 In this way, there are parts that are easy to bend and parts that are difficult to bend in the yoke part. Therefore, when the yoke portion is spirally wound, the diameter dimension varies due to the difference in the bendability of the yoke portion.
　本開示は、かかる課題に鑑みてなされたものであり、回転機コアの径寸法のばらつきを抑制することができる回転機コアの製造を提供しようとするものである。 The present disclosure has been made in view of such a problem, and is intended to provide the manufacture of a rotary machine core capable of suppressing variations in the diameter dimension of the rotary machine core.
　本開示の第１の態様は、帯状に延びるヨーク部と、該ヨーク部の幅方向の第１端から延びる複数のティース部とを有すると共に、上記ヨーク部内に、該ヨーク部から延びる上記ティース部が形成されたティース部延長領域と、上記ティース部が形成されていないティース部非延長領域とを有する櫛状シートを、板材から打ち抜くシート形成工程と、
　上記櫛状シートの上記ヨーク部を圧延することにより、上記ヨーク部を上記幅方向に湾曲させて螺旋状に巻回しつつ積層する成形工程と、を有し、
　上記櫛状シートにおける上記ヨーク部の上記ティース部延長領域において、上記ヨーク部を上記幅方向に２分する中央線と上記成形工程での巻回により内周側となる上記ヨーク部の上記幅方向の端部との間に、周囲よりも板材が板厚方向に張り出した張出部を形成するか、あるいは、上記板材における上記ヨーク部の上記ティース部延長領域に対応する箇所において、上記ヨーク部に対応する箇所を幅方向に２分する中央線と上記成形工程での巻回により内周側となる上記ヨーク部の上記幅方向の端部に対応する箇所との間に、周囲よりも板材が板厚方向に張り出した張出部を形成する張出成形工程を上記成形工程より前に行う、回転機コアの製造方法にある。 The first aspect of the present disclosure has a yoke portion extending in a band shape and a plurality of teeth portions extending from the first end in the width direction of the yoke portion, and the teeth portion extending from the yoke portion in the yoke portion. A sheet forming step of punching a comb-shaped sheet having a teeth portion extension region in which a tooth portion is formed and a teeth portion non-extension region in which the teeth portion is not formed from a plate material.
By rolling the yoke portion of the comb-shaped sheet, the yoke portion is curved in the width direction and laminated while being spirally wound.
In the tooth portion extension region of the yoke portion of the comb-shaped sheet, the center line that divides the yoke portion into two in the width direction and the width direction of the yoke portion that becomes the inner peripheral side by winding in the molding step. An overhanging portion is formed between the plate material and the end portion of the plate material in the thickness direction of the plate material, or the yoke portion in the plate material corresponds to the teeth portion extension region of the yoke portion. Between the center line that divides the part corresponding to the width into two in the width direction and the part corresponding to the end portion of the yoke portion on the inner peripheral side due to the winding in the molding process in the width direction, the plate material is more than the periphery. Is a method for manufacturing a rotary machine core, in which an overhang forming step of forming an overhanging portion in the plate thickness direction is performed before the above forming step.
　本開示の第２の態様は、帯状に延びるヨーク部と、該ヨーク部の幅方向の第１端から延びる複数のティース部とを有すると共に、上記ヨーク部内に、該ヨーク部から延びる上記ティース部が形成されたティース部延長領域と、上記ティース部が形成されていないティース部非延長領域とを有する櫛状シートを、板材から打ち抜くシート形成工程と、
　上記櫛状シートの上記ヨーク部を圧延することにより、上記ヨーク部を上記幅方向に湾曲させて螺旋状に巻回しつつ積層する成形工程と、を有し、
　上記櫛状シートにおける上記ヨーク部の上記ティース部非延長領域に、上記ヨーク部の延び方向に沿って延びる少なくとも１つの溝部を形成するか、あるいは、上記板材における上記ヨーク部の上記ティース部非延長領域に対応する箇所に、上記ヨーク部に対応する箇所の延び方向に沿って延びる少なくとも１つの溝部を形成する溝形成工程を上記成形工程より前に行う、回転機コアの製造方法にある。 A second aspect of the present disclosure has a yoke portion extending in a band shape and a plurality of teeth portions extending from the first end in the width direction of the yoke portion, and the teeth portion extending from the yoke portion in the yoke portion. A sheet forming step of punching a comb-shaped sheet having a teeth portion extension region in which a tooth portion is formed and a teeth portion non-extension region in which the teeth portion is not formed from a plate material.
By rolling the yoke portion of the comb-shaped sheet, the yoke portion is curved in the width direction and laminated while being spirally wound.
At least one groove extending along the extending direction of the yoke portion is formed in the teeth portion non-extension region of the yoke portion in the comb-shaped sheet, or the teeth portion non-extension of the yoke portion in the plate material is formed. A method of manufacturing a rotary machine core is in which a groove forming step of forming at least one groove extending along an extending direction of a portion corresponding to the yoke portion is performed prior to the forming step at a portion corresponding to a region.
　本開示の第３の態様は、帯状に延びるヨーク部と、該ヨーク部の幅方向の第１端から延びる複数のティース部とを有すると共に、上記ヨーク部内に、該ヨーク部から延びる上記ティース部が形成されたティース部延長領域と、上記ティース部が形成されていないティース部非延長領域とを有する櫛状シートを、板材から打ち抜くシート形成工程と、
　上記櫛状シートの上記ヨーク部を圧延することにより、上記ヨーク部を上記幅方向に湾曲させて螺旋状に巻回しつつ積層する成形工程と、を有し、
　上記櫛状シートにおける上記ヨーク部の上記ティース部非延長領域に、上記ティース部延長領域よりも厚みの小さい薄肉部を形成するか、あるいは、上記板材における上記ヨーク部の上記ティース部非延長領域に対応する箇所に、上記ティース部延長領域に対応する箇所よりも厚みの小さい薄肉部を形成する薄肉化工程を上記成形工程より前に行う、回転機コアの製造方法にある。 A third aspect of the present disclosure has a yoke portion extending in a band shape and a plurality of teeth portions extending from the first end in the width direction of the yoke portion, and the teeth portion extending from the yoke portion in the yoke portion. A sheet forming step of punching a comb-shaped sheet having a teeth portion extension region in which a tooth portion is formed and a teeth portion non-extension region in which the teeth portion is not formed from a plate material.
By rolling the yoke portion of the comb-shaped sheet, the yoke portion is curved in the width direction and laminated while being spirally wound.
A thin portion having a thickness smaller than the teeth portion extension region is formed in the teeth portion non-extension region of the yoke portion in the comb-shaped sheet, or the teeth portion non-extension region of the yoke portion in the plate material is formed. The present invention is a method for manufacturing a rotary machine core, in which a thinning step of forming a thin portion having a thickness smaller than that corresponding to the portion extending region of the teeth portion is performed at a corresponding portion before the molding step.
　本開示の第４の態様は、帯状に延びるヨーク部と、該ヨーク部の幅方向の第１端から延びる複数のティース部と、下記成形工程での巻回により外周側となる上記ヨーク部の上記幅方向の端部に形成された切欠き部とを有する櫛状シートを、板材から打ち抜くシート形成工程と、
　上記櫛状シートの上記ヨーク部を圧延することにより、上記ヨーク部を上記幅方向に湾曲させて螺旋状に巻回しつつ積層する成形工程と、を有し、
　上記櫛状シートの上記切欠き部が形成された位置における上記ヨーク部に、該ヨーク部の延び方向に沿って延びる少なくとも１つの溝部を形成するか、あるいは、上記板材において上記切欠き部が形成される位置に対応する箇所における上記ヨーク部に対応する箇所に、該ヨーク部に対応する箇所の延び方向に沿って延びる少なくとも１つの溝部を形成する溝形成工程を上記成形工程より前に行う、回転機コアの製造方法にある。 A fourth aspect of the present disclosure is a yoke portion extending in a strip shape, a plurality of teeth portions extending from the first end in the width direction of the yoke portion, and the yoke portion that becomes an outer peripheral side by winding in the following molding process. A sheet forming step of punching a comb-shaped sheet having a notch formed at an end portion in the width direction from a plate material,
By rolling the yoke portion of the comb-shaped sheet, the yoke portion is curved in the width direction and laminated while being spirally wound.
At least one groove extending along the extending direction of the yoke portion is formed in the yoke portion at the position where the notch portion of the comb-shaped sheet is formed, or the notch portion is formed in the plate material. Prior to the molding step, a groove forming step of forming at least one groove extending along the extending direction of the portion corresponding to the yoke portion is performed at the portion corresponding to the yoke portion at the portion corresponding to the position to be formed. It is in the manufacturing method of the rotating machine core.
　本開示の第５の態様は、帯状に延びるヨーク部と、該ヨーク部の幅方向の第１端から延びる複数のティース部と、下記成形工程での巻回により外周側となる上記ヨーク部の上記幅方向の端部に形成された切欠き部とを有する櫛状シートを、板材から打ち抜くシート形成工程と、
　上記櫛状シートの上記ヨーク部を圧延することにより、上記ヨーク部を上記幅方向に湾曲させて螺旋状に巻回しつつ積層する成形工程と、を有し、
　上記櫛状シートの上記切欠き部が形成された位置における上記ヨーク部に、周囲よりも厚みの小さい薄肉部を形成するか、あるいは、上記板材において上記切欠き部が形成される位置に対応する箇所における上記ヨーク部に対応する箇所に、周囲よりも厚みの小さい薄肉部を形成する薄肉化工程を上記成形工程より前に行う、回転機コアの製造方法にある。 A fifth aspect of the present disclosure is a yoke portion extending in a strip shape, a plurality of teeth portions extending from the first end in the width direction of the yoke portion, and the yoke portion that becomes an outer peripheral side by winding in the following molding process. A sheet forming step of punching a comb-shaped sheet having a notch formed at an end portion in the width direction from a plate material,
By rolling the yoke portion of the comb-shaped sheet, the yoke portion is curved in the width direction and laminated while being spirally wound.
A thin portion having a thickness smaller than the periphery is formed in the yoke portion at the position where the notch portion is formed in the comb-shaped sheet, or corresponds to the position where the notch portion is formed in the plate material. This is a method for manufacturing a rotary machine core, in which a thinning step of forming a thin portion having a thickness smaller than that of the periphery is performed before the molding step at a portion corresponding to the yoke portion in the portion.
　第１の態様の張出成形工程では張出部を形成するため、成形工程前の櫛状シートは、ティース部延長領域の上記所定の領域に張出部を有する。所定の領域は、ティース部延長領域における中央線と、成形工程での巻回時に内周側となるヨーク部の端部との間である。成形工程での圧延により、張出部が潰されて伸ばされるため、ティース部延長領域がティース部非延長領域と同程度に伸ばされ易くなる。その結果、成形工程での巻回時に、ヨーク部の伸び量が、ティース部延長領域及びティース部非延長領域において略均一化される。そのため、成形工程での螺旋状の巻回時に起こりうる径寸法のばらつきを小さくすることができる。 Since the overhanging portion is formed in the overhanging molding step of the first aspect, the comb-shaped sheet before the molding step has an overhanging portion in the above-mentioned predetermined region of the teeth portion extension region. The predetermined region is between the center line in the tooth portion extension region and the end portion of the yoke portion that becomes the inner peripheral side at the time of winding in the molding process. Since the overhanging portion is crushed and stretched by rolling in the molding step, the teeth portion extension region is likely to be stretched to the same extent as the teeth portion non-extension region. As a result, the amount of elongation of the yoke portion is substantially made uniform in the teeth portion extension region and the teeth portion non-extension region during winding in the molding process. Therefore, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process.
　第２の態様の溝形成工程では溝部を形成するため、成形工程前の櫛状シートは、ティース部非延長領域に溝部を有する。溝部は、成形工程での巻回時にティース部非延長領域の周方向の伸びを抑制する。そのため、成形工程では、ヨーク部の伸び量がティース部非延長領域及びティース部延長領域において略均一化される。その結果、成形工程での螺旋状の巻回時に起こりうる径寸法のばらつきを小さくすることができる。 Since the groove is formed in the groove forming step of the second aspect, the comb-shaped sheet before the forming step has a groove in the non-extended region of the teeth portion. The groove portion suppresses the elongation of the non-extending region of the tooth portion in the circumferential direction during winding in the molding process. Therefore, in the molding step, the amount of elongation of the yoke portion is substantially made uniform in the teeth portion non-extension region and the teeth portion extension region. As a result, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process.
　第３の態様の薄肉化工程では、薄肉部を形成するため、成形工程前の櫛状シートは、ティース部非延長領域に薄肉部を有する。薄肉部は、成形工程での圧延により伸ばされる材料が少ない。そのため、薄肉部が形成されたティース部非延長領域では、ティース部延長領域に比べて、成形工程での伸びが抑制される。その結果、成形工程では、ヨーク部の伸び量がティース部非延長領域及びティース部延長領域において略均一化される。そのため、成形工程での螺旋状の巻回時に起こりうる径寸法のばらつきを小さくすることができる。 In the thinning step of the third aspect, since the thinning portion is formed, the comb-shaped sheet before the molding step has a thinning portion in the non-extended region of the teeth portion. The thin-walled portion has less material to be stretched by rolling in the molding process. Therefore, in the non-extended region of the teeth portion where the thin-walled portion is formed, the elongation in the molding step is suppressed as compared with the extended region of the teeth portion. As a result, in the molding step, the amount of elongation of the yoke portion is substantially made uniform in the teeth portion non-extension region and the teeth portion extension region. Therefore, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process.
　第４の態様の溝形成工程では溝部を形成するため、成形工程前の櫛状シートは、切欠き部が形成された位置でのヨーク部に溝部を有する。溝部の形成箇所は、成形工程の巻回時に延び難くなる。つまり、成形工程の巻回時には、切欠き部が形成されたヨーク部の伸びが抑制される。その結果、成形工程ではヨーク部の周方向の伸びが略均一化される。そのため、成形工程での螺旋状の巻回時に起こりうる径寸法のばらつきを小さくすることができる。 Since the groove is formed in the groove forming step of the fourth aspect, the comb-shaped sheet before the forming step has a groove in the yoke portion at the position where the notch is formed. The formed portion of the groove portion becomes difficult to extend during winding in the molding process. That is, at the time of winding in the molding process, the elongation of the yoke portion in which the notch portion is formed is suppressed. As a result, in the molding process, the elongation of the yoke portion in the circumferential direction is substantially made uniform. Therefore, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process.
　第５の態様の薄肉化工程では薄肉部を形成するため、成形工程前の櫛状シートは、切欠き部が形成された位置でのヨーク部に薄肉部を有する。薄肉部は、成形工程での圧延により伸ばされる材料が少ないため、薄肉部が形成された箇所では、成形工程での伸びが抑制される。つまり、切欠き部では、薄肉部により伸びが抑制される。その結果、成形工程ではヨーク部の周方向の伸びが略均一化される。そのため、成形工程での螺旋状の巻回時に起こりうる径寸法のばらつきを小さくすることができる。 Since the thin-walled portion is formed in the thinning step of the fifth aspect, the comb-shaped sheet before the molding step has a thin-walled portion in the yoke portion at the position where the notch portion is formed. Since the thin-walled portion has a small amount of material to be stretched by rolling in the molding process, the elongation in the molding process is suppressed at the portion where the thin-walled portion is formed. That is, in the notch portion, the elongation is suppressed by the thin-walled portion. As a result, in the molding process, the elongation of the yoke portion in the circumferential direction is substantially made uniform. Therefore, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process.
　以上のごとく、上記態様によれば、均一な径の回転機コアが得られる回転機コアの製造を提供することができる。
　なお、請求の範囲に記載した括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示すものであり、本開示の技術的範囲を限定するものではない。 As described above, according to the above aspect, it is possible to provide the manufacture of a rotary machine core capable of obtaining a rotary machine core having a uniform diameter.
The reference numerals in parentheses described in the claims indicate the correspondence with the specific means described in the embodiments described later, and do not limit the technical scope of the present disclosure.
　本開示についての上記目的およびその他の目的、特徴や利点は、添付の図面を参照しながら下記の詳細な記述により、より明確になる。その図面は、
図１は、実施形態１における回転機コアの模式図であり、 図２は、実施形態１における回転機コアの上面の模式図であり、 図３は、実施形態１における張出成形工程とシート形成工程の模式図であり、 図４は、実施形態１における板材での張出部の形成位置を示す説明図であり、 図５（ａ）は、実施形態１における櫛状シートにおける張出部周囲を示す模式図であり、図５（ｂ）は、図５（ａ）におけるｂ－ｂ線矢視断面図であり、図５（ｃ）は、図５（ａ）におけるｃ－ｃ線矢視断面図であり、 図６は、実施形態１における張出部の形状のバリエーション（ａ）～（ｄ）を示す説明図であり、 図７は、実施形態１における張出部が成形工程での圧延により伸ばされる様子を示す模式図であり、 図８は、実施形態１における、櫛状シートを螺旋状に巻回させる成形工程を示す模式図であり、 図９は、実施形態１における回転機コアの製造ラインの模式図であり、 図１０は、実施形態１における、プレス機の張出部形成用の金型の模式図であり、 図１１は、実施形態１における、図９の曲げ装置を矢印XII方向から見た図であり、 図１２は、実施形態１における、図９の曲げ装置を矢印XIII方向から見た図であり、 図１３は、変形例１における、張出部形成用の予備成形機のローラを示す模式図であり、 図１４は、変形例２における、シート形成工程と張出成形工程の模式図であり、 図１５は、変形例２における、櫛状シートでの張出部の形成位置を示す説明図であり、 図１６は、実施形態２における回転機コアの上面の模式図であり、 図１７は、実施形態２における溝形成工程とシート形成工程の模式図であり、 図１８は、実施形態２における板材での溝部の形成位置を示す説明図であり、 図１９（ａ）は、実施形態２における櫛状シートにおける溝部周囲を示す模式図であり、図１９（ｂ）は、図１９（ａ）におけるｂ－ｂ線矢視断面図であり、 図２０は、実施形態２における溝部の形状のバリエーション（ａ）～（ｄ）を示す説明図であり、 図２１（ａ）は、実施形態２におけるプレス機の溝部形成用の金型の断面模式図であり、図２１（ｂ）は、実施形態２における上金型のプレス面を示す模式図であり、 図２２（ａ）は、変形例３における溝部形成用の予備成形機のローラを横方向から示す模式図であり、図２２（ｂ）は、変形例３における溝部形成用のローラにおけるローラ面の模式図であり、 図２３は、変形例４における、シート形成工程と溝形成工程の模式図であり、 図２４は、変形例４における、櫛状シートでの溝部の形成位置を示す説明図であり、 図２５は、実施形態３における、回転機コアの模式図であり、 図２６は、実施形態３における、回転機コアの上面の模式図であり、 図２７は、実施形態３における、櫛状シートの部分拡大模式図であり、 図２８は、実施形態３における、大きな切欠き部が形成された櫛状シートの部分拡大模式図であり、 図２９は、実施形態４における回転機コアの上面の模式図であり、 図３０は、実施形態４における薄肉化工程とシート形成工程の模式図であり、 図３１は、実施形態４における板材での薄肉部の形成位置を示す説明図であり、 図３２（ａ）は、実施形態４における櫛状シートにおける薄肉部周囲を示す模式図であり、図３２（ｂ）は、図３２（ａ）におけるｂ－ｂ線矢視断面図であり、図３２（ｃ）は、図３２（ａ）におけるｃ－ｃ線矢視断面図であり、 図３３は、実施形態４における薄肉部の形状のバリエーション（ａ）～（ｄ）を示す説明図であり、 図３４（ａ）は、実施形態４におけるプレス機の薄肉部形成用の金型の断面模式図であり、図３４（ｂ）は、実施形態４における上金型のプレス面を示す模式図であり、 図３５（ａ）は、変形例５における薄肉部形成用の予備成形機のローラを横方向から示す模式図であり、図３５（ｂ）は、薄肉部形成用のローラにおけるローラ面の模式図であり、 図３６は、変形例６における、シート形成工程と薄肉化工程の模式図であり、 図３７は、変形例６における、櫛状シートでの薄肉部の形成位置を示す説明図であり、 図３８は、実施形態５における、回転機コアの上面の模式図であり、 図３９は、実施形態５における、シート形成工程と溝形成工程の模式図であり、 図４０は、実施形態５における、櫛状シートの切欠き部周囲における模式図であり、 図４１は、変形例７における、溝形成工程とシート形成工程の模式図であり、 図４２は、実施形態６における、回転機コアの上面の模式図であり、 図４３は、実施形態６における、シート形成工程と薄肉化工程の模式図であり、 図４４（ａ）は、実施形態６における櫛状シートの切欠き部周囲における模式図であり、図４４（ｂ）は、図４４（ａ）におけるｂ－ｂ線矢視断面図であり、図４４（ｃ）は、図４４（ａ）におけるｃ－ｃ線矢視断面図であり、 図４５は、変形例８における、薄肉化工程とシート形成工程の模式図である。 The above objectives and other objectives, features and advantages of the present disclosure will be clarified by the following detailed description with reference to the accompanying drawings. The drawing is
FIG. 1 is a schematic view of a rotary machine core according to the first embodiment. FIG. 2 is a schematic view of the upper surface of the rotary machine core according to the first embodiment. FIG. 3 is a schematic view of the overhang molding step and the sheet forming step in the first embodiment. FIG. 4 is an explanatory view showing the formation position of the overhanging portion in the plate material in the first embodiment. 5 (a) is a schematic view showing the periphery of the overhanging portion of the comb-shaped sheet in the first embodiment, and FIG. 5 (b) is a cross-sectional view taken along the line bb in FIG. 5 (a). FIG. 5 (c) is a cross-sectional view taken along the line cc in FIG. 5 (a). FIG. 6 is an explanatory diagram showing variations (a) to (d) in the shape of the overhanging portion in the first embodiment. FIG. 7 is a schematic view showing how the overhanging portion in the first embodiment is stretched by rolling in the molding step. FIG. 8 is a schematic view showing a molding process in which the comb-shaped sheet is spirally wound according to the first embodiment. FIG. 9 is a schematic view of the rotary machine core manufacturing line according to the first embodiment. FIG. 10 is a schematic view of a die for forming an overhanging portion of a press machine according to the first embodiment. FIG. 11 is a view of the bending device of FIG. 9 in the first embodiment as viewed from the direction of arrow XII. FIG. 12 is a view of the bending device of FIG. 9 in the first embodiment as viewed from the direction of arrow XIII. FIG. 13 is a schematic view showing a roller of a preforming machine for forming an overhanging portion in the first modification. FIG. 14 is a schematic view of the sheet forming step and the overhang molding step in the modified example 2. FIG. 15 is an explanatory view showing the formation position of the overhanging portion on the comb-shaped sheet in the modified example 2. FIG. 16 is a schematic view of the upper surface of the rotary machine core according to the second embodiment. FIG. 17 is a schematic view of the groove forming step and the sheet forming step in the second embodiment. FIG. 18 is an explanatory view showing the formation position of the groove portion in the plate material in the second embodiment. 19 (a) is a schematic view showing the periphery of the groove portion in the comb-shaped sheet according to the second embodiment, and FIG. 19 (b) is a cross-sectional view taken along the line bb in FIG. 19 (a). FIG. 20 is an explanatory view showing variations (a) to (d) of the shape of the groove portion in the second embodiment. 21 (a) is a schematic cross-sectional view of a die for forming a groove of a press machine in the second embodiment, and FIG. 21 (b) is a schematic view showing a press surface of the upper die in the second embodiment. , FIG. 22 (a) is a schematic view showing the roller of the preforming machine for forming the groove in the modified example 3 from the lateral direction, and FIG. 22 (b) shows the roller surface of the roller for forming the groove in the modified example 3. It is a schematic diagram, FIG. 23 is a schematic view of the sheet forming step and the groove forming step in the modified example 4. FIG. 24 is an explanatory view showing the formation position of the groove portion in the comb-shaped sheet in the modified example 4. FIG. 25 is a schematic view of the rotary machine core in the third embodiment. FIG. 26 is a schematic view of the upper surface of the rotary machine core in the third embodiment. FIG. 27 is a partially enlarged schematic view of the comb-shaped sheet according to the third embodiment. FIG. 28 is a partially enlarged schematic view of the comb-shaped sheet in which a large notch is formed in the third embodiment. FIG. 29 is a schematic view of the upper surface of the rotary machine core according to the fourth embodiment. FIG. 30 is a schematic view of the thinning step and the sheet forming step in the fourth embodiment. FIG. 31 is an explanatory view showing the formation position of the thin-walled portion in the plate material in the fourth embodiment. FIG. 32 (a) is a schematic view showing the periphery of the thin-walled portion of the comb-shaped sheet according to the fourth embodiment, and FIG. 32 (b) is a cross-sectional view taken along the line bb in FIG. 32 (a). 32 (c) is a cross-sectional view taken along the line cc in FIG. 32 (a). FIG. 33 is an explanatory view showing variations (a) to (d) in the shape of the thin-walled portion in the fourth embodiment. FIG. 34 (a) is a schematic cross-sectional view of the die for forming a thin wall portion of the press machine in the fourth embodiment, and FIG. 34 (b) is a schematic view showing the press surface of the upper die in the fourth embodiment. Yes, FIG. 35 (a) is a schematic view showing the roller of the preforming machine for forming the thin wall portion in the modified example 5 from the lateral direction, and FIG. 35 (b) is a schematic view of the roller surface of the roller for forming the thin wall portion. And FIG. 36 is a schematic view of the sheet forming step and the thinning step in the modified example 6. FIG. 37 is an explanatory view showing the formation position of the thin-walled portion on the comb-shaped sheet in the modified example 6. FIG. 38 is a schematic view of the upper surface of the rotary machine core in the fifth embodiment. FIG. 39 is a schematic view of the sheet forming step and the groove forming step in the fifth embodiment. FIG. 40 is a schematic view around the notch portion of the comb-shaped sheet in the fifth embodiment. FIG. 41 is a schematic view of the groove forming step and the sheet forming step in the modified example 7. FIG. 42 is a schematic view of the upper surface of the rotary machine core in the sixth embodiment. FIG. 43 is a schematic view of the sheet forming step and the thinning step in the sixth embodiment. FIG. 44 (a) is a schematic view around the notch portion of the comb-shaped sheet in the sixth embodiment, and FIG. 44 (b) is a cross-sectional view taken along the line bb in FIG. 44 (a). 44 (c) is a cross-sectional view taken along the line cc in FIG. 44 (a). FIG. 45 is a schematic view of the thinning step and the sheet forming step in the modified example 8.
（実施形態１）
　回転機コア１の製造方法に係る実施形態について、図１～図１２を参照して説明する。図１及び図２に示されるように、回転機コア１は、円筒状などの筒状であり、中心軸Ａを貫通する貫通穴を有する。 (Embodiment 1)
An embodiment according to a method for manufacturing the rotary machine core 1 will be described with reference to FIGS. 1 to 12. As shown in FIGS. 1 and 2, the rotary machine core 1 has a cylindrical shape such as a cylindrical shape, and has a through hole penetrating the central axis A.
　回転機コア１は、螺旋状に巻回されつつ積層された櫛状シート４から構成されている。櫛状シート４は、帯状のヨーク部２と、多数のティース部３を有する。ティース部３は、ヨーク部２の幅方向の一端から回転機コア１の中心軸に向かって延びる。なお、以下の説明では、ヨーク部２の幅方向においてティース部３が形成された側の端部を「第１端２１」といい、ティース部３が形成されていない側の端部を「第２端２２」という。 The rotary machine core 1 is composed of a comb-shaped sheet 4 that is spirally wound and laminated. The comb-shaped sheet 4 has a strip-shaped yoke portion 2 and a large number of teeth portions 3. The tooth portion 3 extends from one end of the yoke portion 2 in the width direction toward the central axis of the rotary machine core 1. In the following description, the end on the side where the teeth portion 3 is formed in the width direction of the yoke portion 2 is referred to as "first end 21", and the end on the side where the teeth portion 3 is not formed is referred to as "first end 21". Two ends 22 ".
　ヨーク部２とティース部３とは、一体的に形成されている。ヨーク部２とティース部３との境界には、ギャップ、接合部、接合面が実質的になく、境界とその周囲との間で表面粗さはほとんど変化しない。ヨーク部２とティース部３とは、一枚の板から形成されており、例えば面一である。 The yoke portion 2 and the teeth portion 3 are integrally formed. There are substantially no gaps, joints, or joint surfaces at the boundary between the yoke portion 2 and the teeth portion 3, and the surface roughness hardly changes between the boundary and its periphery. The yoke portion 2 and the teeth portion 3 are formed of a single plate, and are, for example, flush with each other.
　回転機コア１では、例えば長尺の櫛状シート４が螺旋状に巻回されており、巻回状態の櫛状シート４の板面が相互に接触している。具体的には、櫛状シート４が巻回されつつ軸方向の位置を一方向に変えながら積層されて回転機コア１が形成されている。 In the rotary machine core 1, for example, a long comb-shaped sheet 4 is spirally wound, and the plate surfaces of the wound comb-shaped sheet 4 are in contact with each other. Specifically, the comb-shaped sheet 4 is wound and laminated while changing the position in the axial direction in one direction to form the rotary machine core 1.
　回転機コア１において、ヨーク部２は、回転機コア１の周方向Ｘに沿って延びる帯状の部分である。帯状のヨーク部２は、螺旋状に巻回されており、回転機コア１と同様に周方向Ｘを有する。 In the rotary machine core 1, the yoke portion 2 is a band-shaped portion extending along the circumferential direction X of the rotary machine core 1. The band-shaped yoke portion 2 is spirally wound and has a circumferential direction X like the rotary machine core 1.
　ティース部３は、ヨーク部２、回転機コア１の周方向Ｘに直交する方向Ｙに沿ってヨーク部２から延びる。回転機コア１が円筒状の場合には、周方向Ｘに直交する方向Ｙは回転機コア１の径方向である。図１に示すように、ティース部３は、例えば、回転機コア１の中心軸Ａに向かって延びる。構成の図示を省略するが、ティース部３３は、中心軸Ａとは反対向きに延びていてもよい。つまり、ティース部３３は、図１及び図２に示すように、筒状の回転機コア１の内側に向かって延びていてもよいし、図示を省略するが外側に向かって延びていてもよい。 The teeth portion 3 extends from the yoke portion 2 along the direction Y orthogonal to the circumferential direction X of the yoke portion 2 and the rotary machine core 1. When the rotary machine core 1 is cylindrical, the direction Y orthogonal to the circumferential direction X is the radial direction of the rotary machine core 1. As shown in FIG. 1, the teeth portion 3 extends toward, for example, the central axis A of the rotary machine core 1. Although not shown in the configuration, the teeth portion 33 may extend in the direction opposite to the central axis A. That is, as shown in FIGS. 1 and 2, the teeth portion 33 may extend toward the inside of the tubular rotary machine core 1, or may extend toward the outside although not shown. ..
　ヨーク部２には、外周側Ｏとなる端部２５と内周側Ｉとなる端部２６とが存在する。図１及び図２に示すように、ティース部３を内側にして巻回された回転機コア１では、第１端２１が内周側Ｉの端部２６となり、第２端２２が外周側Ｏの端部２５となる。一方、構成の図示を省略するが、ティース部３を外側にして巻回された回転機コア１では、第１端２１が外周側Ｏの端部２５となり、第２端２２が外周側Ｏの端部２６となる。なお、以降の説明では、外周側Ｏとなる端部を外周端２５といい、内周側Ｉとなる端部を内周端２６という。 The yoke portion 2 has an end portion 25 which is an outer peripheral side O and an end portion 26 which is an inner peripheral side I. As shown in FIGS. 1 and 2, in the rotary machine core 1 wound with the teeth portion 3 inside, the first end 21 becomes the end portion 26 of the inner peripheral side I, and the second end 22 becomes the outer peripheral side O. It becomes the end 25 of. On the other hand, although the configuration is not shown, in the rotary machine core 1 wound with the teeth portion 3 on the outside, the first end 21 is the end portion 25 on the outer peripheral side O, and the second end 22 is the outer peripheral side O. It becomes the end part 26. In the following description, the end portion that is the outer peripheral side O is referred to as the outer peripheral end 25, and the end portion that is the inner peripheral side I is referred to as the inner peripheral end 26.
　回転機コア１は、張出成形工程、シート形成工程、成形工程を行い、次の手順で製造される。図３に示すように、張出成形工程では、例えば板材４０の所定位置に張出部２Ａを形成する。シート形成工程では、板材４０から、櫛状シート４を打ち抜く。板材４０は、例えば電磁鋼板である。櫛状シート４は、帯状に延びるヨーク部２と、ヨーク部２の長手方向Ｌと直交方向に沿って延びるティース部３とを有する。ヨーク部の長手方向Ｌは、ヨーク部の延び方向Ｌということもできる。また、櫛状シート４におけるヨーク部２の長手方向Ｌと直交する方向は、ヨーク部２の幅方向Ｗということもできる。 The rotary machine core 1 is manufactured by the following procedure after performing an overhang molding step, a sheet forming step, and a molding step. As shown in FIG. 3, in the overhang molding step, for example, the overhang portion 2A is formed at a predetermined position of the plate material 40. In the sheet forming step, the comb-shaped sheet 4 is punched from the plate material 40. The plate material 40 is, for example, an electromagnetic steel plate. The comb-shaped sheet 4 has a yoke portion 2 extending in a strip shape and a teeth portion 3 extending in a direction orthogonal to the longitudinal direction L of the yoke portion 2. The longitudinal direction L of the yoke portion can also be referred to as the extension direction L of the yoke portion. Further, the direction orthogonal to the longitudinal direction L of the yoke portion 2 in the comb-shaped sheet 4 can be said to be the width direction W of the yoke portion 2.
　ヨーク部２は、ティース部延長領域２３と、ティース部非延長領域２４を有する。ティース部延長領域２３は、ヨーク部２の第１端２１から延びるティース部３が形成された、ヨーク部２における領域である。ティース部非延長領域２４は、ヨーク部２の第１端２１から延びるティース部３が形成さていない、ヨーク部２における領域である。ヨーク部２には、ティース部延長領域２３とティース部非延長領域２４とが延び方向Ｌに交互に存在する。換言すれば、ティース部延長領域２３は、ヨーク部２の第１端２１とティース部３との境界（つまり、ティース部の根元部分）と、ヨーク部２の第２端２２とに挟まれる領域ということができる。さらに、換言すれば、ティース部３の根元の両端から第２端２２に向けて下ろした仮想の垂線に挟まれる領域であるということができる。一方、ティース部非延長領域２４は、ヨーク部２においてティース部延長領域２３に挟まれる領域であるということができる。 The yoke portion 2 has a teeth portion extension region 23 and a teeth portion non-extension region 24. The tooth portion extension region 23 is a region in the yoke portion 2 in which the teeth portion 3 extending from the first end 21 of the yoke portion 2 is formed. The teeth portion non-extension region 24 is a region in the yoke portion 2 in which the teeth portion 3 extending from the first end 21 of the yoke portion 2 is not formed. In the yoke portion 2, the teeth portion extension region 23 and the teeth portion non-extension region 24 are alternately present in the extension direction L. In other words, the teeth portion extension region 23 is a region sandwiched between the boundary between the first end 21 of the yoke portion 2 and the teeth portion 3 (that is, the root portion of the teeth portion) and the second end 22 of the yoke portion 2. It can be said. Further, in other words, it can be said that it is a region sandwiched by a virtual perpendicular line drawn from both ends of the root of the tooth portion 3 toward the second end 22. On the other hand, it can be said that the teeth portion non-extension region 24 is a region sandwiched between the teeth portion extension regions 23 in the yoke portion 2.
　張出成形工程は、成形工程の前に行われ、張出部２Ａは、シート形成工程後の櫛状シート４に対して形成してもよいし、シート形成工程前の板材４０に対して形成してもよい。つまり、成形工程前に張出部２Ａが形成されていればよい。本形態では、板材４０に対して張出部２Ａを形成する場合、つまり、シート形成工程の前に張出成形工程を行う場合について説明する。 The overhang molding step is performed before the molding step, and the overhanging portion 2A may be formed on the comb-shaped sheet 4 after the sheet forming step, or may be formed on the plate material 40 before the sheet forming step. You may. That is, it is sufficient that the overhanging portion 2A is formed before the molding step. In this embodiment, a case where the overhang portion 2A is formed on the plate material 40, that is, a case where the overhang molding step is performed before the sheet forming step will be described.
　図４に示すように、シート形成工程前の板材４０には、ヨーク部２に対応する箇所２Ｐと、ティース部３に対応する箇所３Ｐが存在する。ヨーク部２に対応する箇所２Ｐは、板材４０におけるヨーク部形成予定領域である。ヨーク部に対応する箇所２Ｐは、シート形成工程での打ち抜きによりヨーク部２となる領域であり、打ち抜き後の櫛状シート４におけるヨーク部２と同形状である。ティース部３に対応する箇所３Ｐは、板材４０におけるティース部形成予定領域である。ティース部３に対応する箇所３Ｐは、シート形成工程での打ち抜きによりティース部３となる領域であり、打ち抜き後の櫛状シート４におけるティース部３と同形状である。以降の説明において「～に対応する箇所」は、「～形成予定領域」又は「～形成予定箇所」と同じ意味であり、実際に打ち抜き加工が行われる前の板材における仮想領域である。「～に対応する箇所」は、板材における設計図のようなものであるといえる。 As shown in FIG. 4, the plate material 40 before the sheet forming process has a portion 2P corresponding to the yoke portion 2 and a portion 3P corresponding to the teeth portion 3. The portion 2P corresponding to the yoke portion 2 is a region where the yoke portion is planned to be formed in the plate material 40. The portion 2P corresponding to the yoke portion is a region that becomes the yoke portion 2 by punching in the sheet forming step, and has the same shape as the yoke portion 2 in the comb-shaped sheet 4 after punching. The portion 3P corresponding to the teeth portion 3 is a region where the teeth portion is planned to be formed in the plate material 40. The portion 3P corresponding to the teeth portion 3 is a region that becomes the teeth portion 3 by punching in the sheet forming step, and has the same shape as the teeth portion 3 in the comb-shaped sheet 4 after punching. In the following description, the "location corresponding to" has the same meaning as the "scheduled formation region" or the "scheduled formation region", and is a virtual region in the plate material before the actual punching process is performed. It can be said that the "location corresponding to ..." is like a design drawing for a plate material.
　図４に示すように、ヨーク部に対応する箇所２Ｐには、ティース部延長領域２３に対応する箇所２３Ｐと、ティース部非延長領域２４に対応する箇所２４Ｐとが存在する。櫛状シート４のヨーク部２におけるティース部延長領域２３とティース部非延長領域２４と同様に、板材４０におけるヨーク部に対応する箇所２Ｐには、ティース部延長領域に対応する箇所２３Ｐとティース部非延長領域に対応する箇所２４Ｐとが交互に存在する。 As shown in FIG. 4, the portion 2P corresponding to the yoke portion includes a portion 23P corresponding to the teeth portion extension region 23 and a portion 24P corresponding to the teeth portion non-extension area 24. Similar to the teeth portion extension region 23 and the teeth portion non-extension region 24 in the yoke portion 2 of the comb-shaped sheet 4, the portion 2P corresponding to the yoke portion in the plate material 40 includes the portion 23P and the teeth portion corresponding to the teeth portion extension region. The locations 24P corresponding to the non-extension region are alternately present.
　張出成形工程では、板材４０のティース部延長領域に対応する箇所２３Ｐにおいて、内周端２６に対応する箇所２６Ｐと中央線ＣＰとの間に張出部２Ａを形成する。図８に示すように、成形工程においてティース部３を内側にして巻回させる場合には、内周端２６は、第１端２１である。したがって、図４に示すように、板材４０において、ヨーク部２の幅方向Ｗにおける内周端２６に対応する箇所２６Ｐは、第１端２１に対応する箇所２１Ｐである。巻回の図示を省略するが、成形工程においてティース部３を外側にして巻回させる場合には、ヨーク部２の幅方向Ｗにおける内周端に対応する箇所２６Ｐは第２端に対応する箇所２２Ｐである。以降の説明では、外周端２５が第２端２２である場合について説明するが、第１端２１である場合についても同様である。 In the overhang molding step, at the portion 23P corresponding to the tooth portion extension region of the plate material 40, the overhang portion 2A is formed between the portion 26P corresponding to the inner peripheral end 26 and the center line CP. As shown in FIG. 8, when the teeth portion 3 is wound inside in the molding process, the inner peripheral end 26 is the first end 21. Therefore, as shown in FIG. 4, in the plate material 40, the portion 26P corresponding to the inner peripheral end 26 in the width direction W of the yoke portion 2 is the portion 21P corresponding to the first end 21. Although the winding is not shown, when the teeth portion 3 is wound on the outside in the molding process, the portion 26P corresponding to the inner peripheral end in the width direction W of the yoke portion 2 is the portion corresponding to the second end. It is 22P. In the following description, the case where the outer peripheral end 25 is the second end 22 will be described, but the same applies to the case where the outer peripheral end 25 is the first end 21.
　図４に示すように、中央線ＣＰは、ヨーク部に対応する箇所２Ｐの幅を２分する仮想の線である。張出成形工程では、ティース部延長領域に対応する箇所２３Ｐにおいて、中央線ＣＰと内周端に対応する箇所２６Ｐとの間に張出部２Ａを形成する。張出部２Ａは、その一部が中央線ＣＰと内周端に対応する箇所２６Ｐとの間に配置されるように形成されていればよい。張出部２Ａは、中央線ＣＰを越えて外周端に対応する箇所２５Ｐ側に形成されていてもよく、外周端に対応する箇所２５Ｐに到達してもよい。 As shown in FIG. 4, the center line CP is a virtual line that divides the width of the portion 2P corresponding to the yoke portion into two. In the overhang molding step, an overhang portion 2A is formed between the center line CP and the portion 26P corresponding to the inner peripheral end at the portion 23P corresponding to the tooth portion extension region. The overhanging portion 2A may be formed so that a part thereof is arranged between the center line CP and the portion 26P corresponding to the inner peripheral end. The overhanging portion 2A may be formed on the portion 25P side corresponding to the outer peripheral end beyond the center line CP, or may reach the portion 25P corresponding to the outer peripheral end.
　図４、図５に示すように、張出部２Ａは、周囲よりも板厚方向に張り出した部分である。張出幅Ａ1の大きさは、例えば巻回時の曲率に応じて決定される。曲率が大きくなるほど、張出幅Ａ1を大きくすることができる。張出幅Ａ1は、板厚の１０％以上、板厚の５０％以下であることが好ましい。この場合には、張出部２Ａの形成効果が十分に得られると共に、張出成形による素材の板厚減少を抑えることができるという効果を得ることができる。張出幅Ａ1は、周囲より板厚方向に張り出した部分の最大幅である。張出部２Ａの形状は、特に限定されず、例えば、図６（ａ）～（ｄ）に示すような形状にすることができる。なお、図６（ａ）～（ｄ）は、板材を厚み方向から見たときにおける形状を示す。 As shown in FIGS. 4 and 5, the overhanging portion 2A is a portion overhanging in the plate thickness direction with respect to the periphery. The size of the overhang width A 1 is determined, for example, according to the curvature at the time of winding. The larger the curvature, the larger the overhang width A 1 . The overhang width A 1 is preferably 10% or more of the plate thickness and 50% or less of the plate thickness. In this case, the effect of forming the overhanging portion 2A can be sufficiently obtained, and the effect of suppressing the decrease in the plate thickness of the material due to the overhanging molding can be obtained. The overhang width A 1 is the maximum width of the portion overhanging from the periphery in the plate thickness direction. The shape of the overhanging portion 2A is not particularly limited, and can be, for example, a shape as shown in FIGS. 6A to 6D. 6 (a) to 6 (d) show the shape of the plate material when viewed from the thickness direction.
　ヨーク部２の幅方向Ｗにおける張出部２Ａの長さＡ2は、２．０ｍｍ以上、ヨーク部２の幅Ｗ1以下であることが好ましい。この場合には、張出部２Ａの形成による効果が十分に得られると共に、ティース部３があることによる曲げ抵抗を下げることができる。この効果がより向上するという観点から、張出部２Ａの長さＡ2は、ヨーク部２の幅の１／２以下であることがより好ましい。張出部２Ａの長さＡ2は、幅方向Ｗでの張出部２Ａの最大長さである。なお、ヨーク部２の幅Ｗ1は、通常、２～３０ｍｍである。 The length A 2 of the overhanging portion 2A in the width direction W of the yoke portion 2 is preferably 2.0 mm or more and the width W 1 or less of the yoke portion 2. In this case, the effect of forming the overhanging portion 2A can be sufficiently obtained, and the bending resistance due to the presence of the tooth portion 3 can be reduced. From the viewpoint of further improving this effect , it is more preferable that the length A 2 of the overhanging portion 2A is ½ or less of the width of the yoke portion 2. The length A 2 of the overhanging portion 2A is the maximum length of the overhanging portion 2A in the width direction W. The width W 1 of the yoke portion 2 is usually 2 to 30 mm.
　ヨーク部２の延び方向Ｌにおける張出部２Ａの長さＡ3は、１．５ｍｍ以上、ヨーク部２の延び方向Ｌにおけるティース部延長領域２３の長さＬ1以下であることが好ましい。この場合には、張出部２Ａの形成による効果が十分に得られると共に、ティース部延長領域２３に引張応力を付与することができる。この効果がより向上するという観点から、張出部２Ａの長さＡ3は、Ｌ1の１／２以下であることがより好ましい。張出部２Ａの長さＡ3は、延び方向Ｌでの張出部２Ａの最大長さである。なお、ヨーク部２の延び方向Ｌにおけるティース部延長領域２３の長さＬ1は、例えば２～２０ｍｍである。 The length A 3 of the overhanging portion 2A in the extending direction L of the yoke portion 2 is preferably 1.5 mm or more, and is preferably not more than the length L 1 of the teeth portion extending region 23 in the extending direction L of the yoke portion 2. In this case, the effect of forming the overhanging portion 2A can be sufficiently obtained, and tensile stress can be applied to the tooth portion extending region 23. From the viewpoint of further improving this effect, the length A 3 of the overhanging portion 2A is more preferably 1/2 or less of L 1. The length A 3 of the overhanging portion 2A is the maximum length of the overhanging portion 2A in the extending direction L. The length L 1 of the tooth portion extension region 23 in the extension direction L of the yoke portion 2 is, for example, 2 to 20 mm.
　図３に示すように、張出成形工程後に、シート形成工程を行うことにより、張出部２Ａが形成された櫛状シート４を得ることができる。 As shown in FIG. 3, a comb-shaped sheet 4 on which the overhanging portion 2A is formed can be obtained by performing a sheet forming step after the overhang molding step.
　図８に示すように、成形工程では、櫛状シート４のヨーク部２を幅方向Ｗに湾曲させて螺旋状に巻回しつつ積層する。巻回は、櫛状シート４のヨーク部２を圧延することにより行われる。図８に示すように、ティース部３を内側にして巻回させる場合には、ヨーク部２の延び方向Ｌの伸び量が幅方向Ｗの第１端２１から第２端２２に向けて大きくなるように圧延することにより、幅方向Ｗに湾曲させて巻回させる。一方、図示を省略するが、ティース部３を外側にして巻回させる場合には、ヨーク部２の延び方向Ｌの伸び量が幅方向Ｗの第２端２２から第１端２１に向けて大きくなるように圧延することにより、幅方向Ｗに湾曲させて巻回させる。ヨーク部２の圧延は、一対のローラ５１３、５１４でヨーク部２を挟んで行うことができる。 As shown in FIG. 8, in the molding process, the yoke portion 2 of the comb-shaped sheet 4 is curved in the width direction W and laminated while being spirally wound. The winding is performed by rolling the yoke portion 2 of the comb-shaped sheet 4. As shown in FIG. 8, when the teeth portion 3 is wound inward, the amount of extension of the yoke portion 2 in the extension direction L increases from the first end 21 to the second end 22 in the width direction W. By rolling in this way, it is curved in the width direction W and wound. On the other hand, although not shown, when the teeth portion 3 is wound on the outside, the amount of extension of the yoke portion 2 in the extension direction L increases from the second end 22 to the first end 21 in the width direction W. By rolling so as to be, it is curved in the width direction W and wound. Rolling of the yoke portion 2 can be performed by sandwiching the yoke portion 2 between a pair of rollers 513 and 514.
　成形工程は、張出部２Ａが形成された櫛状シート４に対して行われる。図７に示すように、張出部２Ａは、圧延により容易に広がるため、伸ばされやすい。具体的には、一対のローラ５１３、５１４でヨーク部２が伸ばされる際に、張出部２Ａが潰されて広がるため、張出部２Ａの形成位置は、張出部の非形成位置に比べて延びやすい。成形工程での巻回時には、ヨーク部２の板材４０が周方向に引っ張られて伸びるが、通常、ティース部延長領域２３ではティース部３の存在が伸びに対する抵抗になる。上記のように、ティース部延長領域２３の上記所定領域に張出部２Ａが形成されている場合には、ティース部３が存在していても、圧延により張出部２Ａが広がる。そのため、ティース部延長領域２３がティース部非延長領域２４と同程度の伸びで巻回される。 The molding step is performed on the comb-shaped sheet 4 on which the overhanging portion 2A is formed. As shown in FIG. 7, the overhanging portion 2A is easily expanded by rolling, so that it is easily stretched. Specifically, when the yoke portion 2 is extended by the pair of rollers 513 and 514, the overhanging portion 2A is crushed and expanded, so that the overhanging portion 2A is formed at a position higher than the non-forming position of the overhanging portion. Easy to extend. At the time of winding in the molding process, the plate material 40 of the yoke portion 2 is pulled and stretched in the circumferential direction, but usually, the presence of the teeth portion 3 becomes resistance to stretching in the teeth portion extension region 23. As described above, when the overhanging portion 2A is formed in the predetermined region of the teeth portion extending region 23, the overhanging portion 2A is expanded by rolling even if the teeth portion 3 is present. Therefore, the teeth portion extension region 23 is wound with the same elongation as the teeth portion non-extension region 24.
　回転機コア１は、例えば、図９に示される製造ライン６で製造することができる。この製造ライン６は、巻出し機６１、予備成形機６２、プレス機６４、バッファー装置６５、および成形機５から構成されている。回転機コア１の素材となる板材４０は、コイル状に巻かれた状態から巻出し機６１により巻き出され、予備成形機６２に供給される。板材４０は、具体的には電磁鋼板である。 The rotary machine core 1 can be manufactured, for example, on the production line 6 shown in FIG. The production line 6 includes an unwinding machine 61, a preforming machine 62, a press machine 64, a buffer device 65, and a molding machine 5. The plate material 40, which is the material of the rotary machine core 1, is unwound by the unwinding machine 61 from the coiled state and supplied to the preforming machine 62. Specifically, the plate material 40 is an electromagnetic steel plate.
　予備成形機６２は、巻出し機６１から供給される板材４０を厚み方向に挟む一対の円筒ローラ６２１、６２２を備えている。予備成形機６２の第１ローラ６２１、第２ローラ６２２に挟まれることにより、板材４０に対して予備成形を行うことができる。具体的には、後述の変形例１に示すように、第１ローラ６２１、第２ローラ６２２として、張出部２Ａに対応する形状の凸歯面６２１ａ、凹歯面６２２ａをそれぞれ有する一対のローラを用いることにより張出部２Ａを形成することができる。なお、張出部２Ａは、プレス機６４において形成することも可能であり、この場合には、製造ライン６から予備成形機６２を省略することができる。 The preforming machine 62 includes a pair of cylindrical rollers 621 and 622 that sandwich the plate material 40 supplied from the unwinding machine 61 in the thickness direction. By being sandwiched between the first roller 621 and the second roller 622 of the preforming machine 62, the plate material 40 can be preformed. Specifically, as shown in the modified example 1 described later, as the first roller 621 and the second roller 622, a pair of rollers having a convex tooth surface 621a and a concave tooth surface 622a having shapes corresponding to the overhanging portion 2A, respectively. Can be used to form the overhanging portion 2A. The overhanging portion 2A can also be formed in the press machine 64, and in this case, the preforming machine 62 can be omitted from the production line 6.
　プレス機６４は、ボルスタ６４１上に設けられている下金型６４２と、スライド６４３に設けられている上金型６４４と、巻出し機６１又は予備成形機６２から供給される板材４０を下金型６４２と上金型６４４との間に間欠的に送り出す送り装置６４５とを備えている。上金型６４４は、下金型６４２に対して接近および離間するように往復移動可能である。上金型６４４および下金型６４２は、互いに接近するように相対移動するとき、図３に示すように、板材４０に張出部２Ａを形成し、さらに板材４０に打ち抜き加工を施して櫛状シート４を形成する。プレス機６４は、板材４０に張出部２Ａを形成する張出成形工程と、櫛状シート４を板材４０から打ち抜く工程（つまりシート形成工程）とを担う装置である。 The press machine 64 lowers the lower die 642 provided on the bolster 641, the upper die 644 provided on the slide 643, and the plate material 40 supplied from the unwinding machine 61 or the preforming machine 62. A feeding device 645 that intermittently feeds between the mold 642 and the upper mold 644 is provided. The upper mold 644 can be reciprocated so as to approach and separate from the lower mold 642. When the upper die 644 and the lower die 642 move relative to each other so as to approach each other, as shown in FIG. 3, an overhanging portion 2A is formed on the plate material 40, and the plate material 40 is further punched to form a comb shape. Form the sheet 4. The press machine 64 is a device that carries out an overhang forming step of forming the overhanging portion 2A on the plate material 40 and a step of punching the comb-shaped sheet 4 from the plate material 40 (that is, a sheet forming step).
　プレス機６４にて張出部２Ａを形成する場合、図１０に示すような下金型６４２と上金型６４４が用いられる。上金型６４４は、パンチ６４４ａと押さえ６４４ｂとを有する。下金型６４２は、押さえ部６４２ａとパンチ６４４ａが通過可能な穴６４２ｂとを有する。上金型６４４および下金型６４２が互いに接近するように相対移動するときに、板材４０が押さえ６４４ｂと下金型６４２との間に狭持されつつ、パンチ６４４ａに押圧される。これにより上述の所定位置に張出部２Ａが形成される。また、金型構成の図示を省略するが、プレス機６４は、櫛状シート４を打ち抜くための下金型と上金型を備えており、これらの金型により、櫛状シート４が形成される。 When the overhanging portion 2A is formed by the press machine 64, the lower die 642 and the upper die 644 as shown in FIG. 10 are used. The upper die 644 has a punch 644a and a presser 644b. The lower die 642 has a holding portion 642a and a hole 642b through which the punch 644a can pass. When the upper mold 644 and the lower mold 642 move relative to each other, the plate material 40 is pressed by the punch 644a while being sandwiched between the pressing 644b and the lower mold 642. As a result, the overhanging portion 2A is formed at the above-mentioned predetermined position. Further, although not shown in the die configuration, the press machine 64 is provided with a lower die and an upper die for punching the comb-shaped sheet 4, and the comb-shaped sheet 4 is formed by these dies. To.
　図９に示すように、バッファー装置６５は、プレス機６４から間欠的に供給される櫛状シート４を収容しつつ、収容した櫛状シート４を成形機５に連続的に供給する。成形機５は、曲げ装置５１および巻取装置５７を備えている。 As shown in FIG. 9, the buffer device 65 accommodates the comb-shaped sheet 4 intermittently supplied from the press machine 64, and continuously supplies the accommodated comb-shaped sheet 4 to the molding machine 5. The molding machine 5 includes a bending device 51 and a winding device 57.
　図１１、図１２に示すように、曲げ装置５１は、モータ５２と、モータ５２の出力軸に連結されている減速機５３と、減速機５３の出力部材に連結されている円筒ローラ５１３と、円筒ローラ５１３に隣接する位置で回転可能に設けられているテーパローラ５１４と、テーパローラ５１４を円筒ローラ５１３に対し接近および離間する方向へ移動可能な荷重制御装置５６とを備えている。 As shown in FIGS. 11 and 12, the bending device 51 includes a motor 52, a speed reducer 53 connected to the output shaft of the motor 52, and a cylindrical roller 513 connected to the output member of the speed reducer 53. It includes a taper roller 514 that is rotatably provided at a position adjacent to the cylindrical roller 513, and a load control device 56 that can move the taper roller 514 in a direction that approaches and separates from the cylindrical roller 513.
　円筒ローラ５１３およびテーパローラ５１４は、バッファー装置６５から供給される櫛状シート４のヨーク部２に圧延加工を施す。荷重制御装置５６は、テーパローラ５１４から櫛状シート４に作用する荷重を所定値に制御する。円筒ローラ５１３とテーパローラ５１４との間の隙間は、櫛状シート４のヨーク部２の第１端２１から第２端２２にかけて徐々に小さくなっている。これにより、櫛状シート４のヨーク部２は、延び方向Ｌの伸び量が内周端２６から外周端２５にかけて大きくなるように圧延され、幅方向Ｗに湾曲するように曲げられる。 The cylindrical roller 513 and the taper roller 514 roll the yoke portion 2 of the comb-shaped sheet 4 supplied from the buffer device 65. The load control device 56 controls the load acting on the comb-shaped sheet 4 from the taper roller 514 to a predetermined value. The gap between the cylindrical roller 513 and the taper roller 514 gradually decreases from the first end 21 to the second end 22 of the yoke portion 2 of the comb-shaped sheet 4. As a result, the yoke portion 2 of the comb-shaped sheet 4 is rolled so that the amount of elongation in the extending direction L increases from the inner peripheral end 26 to the outer peripheral end 25, and is bent so as to be curved in the width direction W.
　図８に示すように、巻取装置５７は、曲げ装置５１による圧延後の櫛状シート４を巻取軸５８に螺旋状に巻きつつ積層する。成形機５は、櫛状シート４のヨーク部２を幅方向Ｗに湾曲するように曲げた後に螺旋状に巻きつつ積層する成形工程を担う装置である。積層体は、軸方向長さが所定値になると櫛状シート４から切り離される。その後、必要に応じて行われる各種仕上げ工程を経て螺旋型の回転機コア１が得られる。以上のように、張出成形工程、シート形成工程、成形工程を連続的に行うことにより、回転機コア１を製造することができる。 As shown in FIG. 8, the winding device 57 spirally winds the comb-shaped sheet 4 rolled by the bending device 51 around the winding shaft 58 and stacks the sheets. The molding machine 5 is a device that is responsible for a molding process in which the yoke portion 2 of the comb-shaped sheet 4 is bent so as to be curved in the width direction W and then spirally wound and laminated. The laminate is separated from the comb-shaped sheet 4 when the axial length reaches a predetermined value. After that, the spiral rotary machine core 1 is obtained through various finishing steps performed as needed. As described above, the rotary machine core 1 can be manufactured by continuously performing the overhang molding step, the sheet forming step, and the molding step.
　図３～図５に示すように、本形態では、張出成形工程において張出部２Ａを形成する。具体的には、板材４０におけるヨーク部２のティース部延長領域２３に対応する箇所２３Ｐにおいて、ヨーク部２の内周端２６に対応する箇所２６Ｐと中央線ＣＰとの間に張出部２Ａを形成する。中央線ＣＰは、板材４０におけるヨーク部２に対応する箇所２Ｐを幅方向Ｗに二分する線である。図４では、ティース部延長領域２３に対応する箇所２３Ｐにおける中央線ＣＰと内周端に対応する箇所２６Ｐとの間の領域を、斜線を付けて示している。 As shown in FIGS. 3 to 5, in this embodiment, the overhang portion 2A is formed in the overhang molding step. Specifically, in the portion 23P of the plate material 40 corresponding to the tooth portion extension region 23 of the yoke portion 2, the overhanging portion 2A is provided between the portion 26P corresponding to the inner peripheral end 26 of the yoke portion 2 and the center line CP. Form. The central line CP is a line that divides the portion 2P of the plate material 40 corresponding to the yoke portion 2 into two in the width direction W. In FIG. 4, the region between the center line CP and the portion 26P corresponding to the inner peripheral end in the portion 23P corresponding to the tooth portion extension region 23 is shown with a diagonal line.
　張出部２Ａが形成されていない場合、ティース部３の存在が成形工程でのヨーク部２の曲げに対する抵抗となる。そのため、ヨーク部２におけるティース部延長領域２３が伸びにくい。特に、ヨーク部２を幅方向Ｗに２分する中央線Ｃより内側が伸びにくい。本形態のように、成形工程の前に、ティース部延長領域２３におけるヨーク部２の内周端２６と中央線Ｃとの間に張出部２Ａを形成しておくことにより、成形工程での圧延によって張出部２Ａが潰される。そのため、ティース部延長領域２３がティース部非延長領域と同様に伸ばされ易くなる。その結果、成形工程での圧延時に、ヨーク部２の内周側Ｉの伸び量が、ティース部延長領域２３及びティース部非延長領域２４において略均一化にされる。そのため、成形工程での螺旋状の巻回時に起こりうる径寸法のばらつきを小さくすることができる。 When the overhanging portion 2A is not formed, the presence of the teeth portion 3 becomes a resistance to bending of the yoke portion 2 in the molding process. Therefore, the tooth portion extension region 23 in the yoke portion 2 is difficult to extend. In particular, the inside of the yoke portion 2 is less likely to extend than the center line C that divides the yoke portion 2 into two in the width direction W. As in this embodiment, by forming the overhanging portion 2A between the inner peripheral end 26 of the yoke portion 2 and the center line C in the tooth portion extension region 23 before the molding step, the overhanging portion 2A is formed in the molding step. The overhanging portion 2A is crushed by rolling. Therefore, the teeth portion extension region 23 is likely to be stretched in the same manner as the teeth portion non-extension region. As a result, during rolling in the molding step, the amount of elongation of the inner peripheral side I of the yoke portion 2 is made substantially uniform in the teeth portion extension region 23 and the teeth portion non-extension region 24. Therefore, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process.
　したがって、回転機コア１は、設計通りの所定寸法内に収まるため、例えば回転電機のハウジングに組み付けられなくなることを防止できる。また、回転機コア１の内面及び外面に段差が発生することを防止できる。そのため、例えば回転電機の磁気回路にギャップが生まれ磁気特性が低下したり、回転機コア１の固定力が低下し振動および異音が発生したりすることを防止できる。 Therefore, since the rotary machine core 1 fits within the predetermined dimensions as designed, it is possible to prevent the rotary machine core 1 from being unable to be assembled to the housing of the rotary electric machine, for example. Further, it is possible to prevent a step from being generated on the inner surface and the outer surface of the rotary machine core 1. Therefore, for example, it is possible to prevent a gap from being generated in the magnetic circuit of the rotating electric machine to reduce the magnetic characteristics, or to reduce the fixing force of the rotating machine core 1 to generate vibration and abnormal noise.
　また、ティース部非延長領域２４は、ティース部延長領域２３に比べて成形工程において伸びやすいため、板材４０のティース部非延長領域２４に対応する箇所２４Ｐには、張出部２Ａを形成する必要はない。つまり、ティース部非延長領域２４に対応する箇所２４Ｐには、張出部非形成部２１Ａを設けることができる。張出部非形成部２１Ａは、張出部が形成されていない箇所である。 Further, since the teeth portion non-extension region 24 is more easily stretched in the molding process than the teeth portion extension region 23, it is necessary to form an overhanging portion 2A at the portion 24P corresponding to the teeth portion non-extension region 24 of the plate material 40. There is no. That is, the overhanging portion non-forming portion 21A can be provided at the portion 24P corresponding to the teeth portion non-extension region 24. The overhanging portion non-forming portion 21A is a portion where the overhanging portion is not formed.
（変形例１）
　本例では、張出部２Ａを予備成形機６２のローラ６２１、６２２により形成する例について説明する。なお、変形例１以降において用いた符号のうち、既出の実施形態において用いた符号と同一のものは、特に示さない限り、既出の実施形態におけるものと同様の構成要素等を表す。 (Modification example 1)
In this example, an example in which the overhanging portion 2A is formed by the rollers 621 and 622 of the preforming machine 62 will be described. In addition, among the reference numerals used in the first and subsequent modifications, the same reference numerals as those used in the above-described embodiments represent the same components and the like as those in the above-mentioned embodiments, unless otherwise specified.
　図１３に示すように、本例の予備成形機６２は、相互に嵌合する歯車状の第１ローラ６２１及び第２ローラ６２２を有している。図１３に示ように、板材４０が第１ローラ６２１の凸歯面６２１ａと凹歯面６２２ａとに挟まれることにより、張出部２Ａが形成される。 As shown in FIG. 13, the preforming machine 62 of this example has a gear-shaped first roller 621 and a second roller 622 that are fitted to each other. As shown in FIG. 13, the overhanging portion 2A is formed by sandwiching the plate member 40 between the convex tooth surface 621a and the concave tooth surface 622a of the first roller 621.
　本例のように、予備成形機６２で張出部２Ａを形成する場合には、プレス機６４で張出部２Ａを形成する必要はないため、プレス機６４では、櫛状シート４の打ち抜きが行われる。その他は実施形態１と同様にして回転機コア１を製造することができ、本例の製造方法でも実施形態１と同様の効果を生じる。 When the overhanging portion 2A is formed by the preforming machine 62 as in this example, it is not necessary to form the overhanging portion 2A by the press machine 64. Therefore, in the press machine 64, the comb-shaped sheet 4 is punched out. Will be done. Other than that, the rotary machine core 1 can be manufactured in the same manner as in the first embodiment, and the manufacturing method of this example also produces the same effect as that of the first embodiment.
（変形例２）
　本例は、実施形態１における張出成形工程とシート形成工程との順序を入れ替えた例である。つまり、シート形成工程、張出成形工程、成形工程を順次行うことにより、回転機コア１を製造する。図１４に示されるように、まず、板材４０から、ヨーク部２とティース部３とを有する長尺の櫛状シート４を打ち抜く。 (Modification 2)
This example is an example in which the order of the overhang molding step and the sheet forming step in the first embodiment is changed. That is, the rotary machine core 1 is manufactured by sequentially performing the sheet forming step, the overhang molding step, and the molding step. As shown in FIG. 14, first, a long comb-shaped sheet 4 having a yoke portion 2 and a teeth portion 3 is punched out from the plate material 40.
　次いで、図１４、図１５に示すように、ヨーク部２に張出部２Ａを形成する。ヨーク部２には、ティース部延長領域２３とティース部非延長領域２４とが存在する。図１５に示すように、ティース部延長領域２３は、ヨーク部２から延びるティース部３が形成された、ヨーク部２における領域である。ティース部非延長領域２４は、ヨーク部２から延びるティース部３が形成さていない、ヨーク部２における領域である。ヨーク部２には、ティース部延長領域２３とティース部非延長領域２４とが延び方向Ｌに交互に存在する。 Next, as shown in FIGS. 14 and 15, an overhanging portion 2A is formed in the yoke portion 2. The yoke portion 2 has a teeth portion extension region 23 and a teeth portion non-extension region 24. As shown in FIG. 15, the teeth portion extension region 23 is a region in the yoke portion 2 in which the teeth portion 3 extending from the yoke portion 2 is formed. The teeth portion non-extension region 24 is a region in the yoke portion 2 in which the teeth portion 3 extending from the yoke portion 2 is not formed. In the yoke portion 2, the teeth portion extension region 23 and the teeth portion non-extension region 24 are alternately present in the extension direction L.
　張出部２Ａは、ティース部延長領域２３において、ヨーク部２の幅方向Ｗにおける中央線Ｃとヨーク部２の内周端２６との間に形成される。図１５では、ティース部延長領域２３における中央線Ｃと内周端２６との間の領域を、斜線を付けて示している。 The overhanging portion 2A is formed in the teeth portion extending region 23 between the center line C in the width direction W of the yoke portion 2 and the inner peripheral end 26 of the yoke portion 2. In FIG. 15, the region between the center line C and the inner peripheral end 26 in the tooth portion extension region 23 is shown with diagonal lines.
　その後、実施形態１と同様に成形工程を行うことにより、回転機コア１を製造することができる。本例のように、張出成形工程とシート形成工程との順序を入れ替えても、成形工程前の櫛状シート４に張出部２Ａが形成されるため、実施形態１と同様の効果が得られる。 After that, the rotary machine core 1 can be manufactured by performing the molding process in the same manner as in the first embodiment. Even if the order of the overhang molding step and the sheet forming step is changed as in this example, the overhanging portion 2A is formed on the comb-shaped sheet 4 before the forming step, so that the same effect as that of the first embodiment can be obtained. Be done.
（実施形態２）
　板材４０のティース部非延長領域２４に対応する箇所２４Ｐに、溝部２Ｂを形成する形態について説明する。本形態では、図１６に示すように、ティース部延長領域２３に張出部２Ａが形成されておらず、ティース部非延長領域２４に溝部２Ｂを有する点を除き、実施形態１と同様の形状の回転機コア１を製造する。ティース部延長領域２３には、溝部２Ｂを形成する必要はない。つまり、ティース部延長領域２３には、溝部非形成部２１Ｂを設けることができる。溝部非形成部２１Ｂは、溝部２Ｂが形成されていない箇所である。 (Embodiment 2)
A mode in which the groove portion 2B is formed at the portion 24P corresponding to the tooth portion non-extension region 24 of the plate material 40 will be described. In this embodiment, as shown in FIG. 16, the shape is the same as that of the first embodiment except that the overhanging portion 2A is not formed in the tooth portion extension region 23 and the groove portion 2B is provided in the tooth portion non-extension region 24. The rotating machine core 1 of the above is manufactured. It is not necessary to form the groove portion 2B in the tooth portion extension region 23. That is, the groove portion non-forming portion 21B can be provided in the tooth portion extension region 23. The groove portion non-forming portion 21B is a portion where the groove portion 2B is not formed.
　回転機コア１は、溝形成工程と、シート形成工程と、成形工程とを行い、次の手順で製造される。溝部２Ｂは、シート形成後の櫛状シート４に対して形成してもよいし、シート形成工程前の板材４０に対して形成してもよい。つまり、成形工程前に溝部２Ｂが形成されていればよい。本形態では、板材４０に対して溝部２Ｂを形成する場合について説明する。 The rotary machine core 1 is manufactured by the following procedure after performing a groove forming step, a sheet forming step, and a forming step. The groove portion 2B may be formed on the comb-shaped sheet 4 after the sheet is formed, or may be formed on the plate material 40 before the sheet forming step. That is, it is sufficient that the groove portion 2B is formed before the molding process. In this embodiment, a case where the groove portion 2B is formed with respect to the plate material 40 will be described.
　図１７、図１８に示すように、溝形成工程では、板材４０に溝部２Ｂを形成する。図１８に示すように、溝部２Ｂは、板材４０のヨーク部２に対応する箇所２Ｐにおけるティース部非延長領域２４に対応する箇所２４Ｐに形成する。ティース部延長領域２３に対応する箇所２３Ｐには、例えば溝部２Ｂを形成しない。つまり、ティース部延長領域２３に対応する箇所２３Ｐには、溝部非形成部２１Ｂが存在する。 As shown in FIGS. 17 and 18, in the groove forming step, the groove portion 2B is formed in the plate material 40. As shown in FIG. 18, the groove portion 2B is formed at the portion 24P corresponding to the teeth portion non-extension region 24 in the portion 2P corresponding to the yoke portion 2 of the plate material 40. For example, the groove portion 2B is not formed in the portion 23P corresponding to the tooth portion extension region 23. That is, the groove non-forming portion 21B exists in the portion 23P corresponding to the tooth portion extension region 23.
　溝部２Ｂは、ヨーク部２の延び方向Ｌ（つまり、長手方向Ｌ）に沿って形成されている。換言すれば、溝部２Ｂは、ティース部３の延び方向と直交する方向に沿って延びる。溝部２Ｂの形成により、成形工程での巻回時に、ティース部非延長領域２４の周方向における伸びが抑制される。ヨーク部２の延び方向Ｌにおける溝部２Ｂの長さが大きくなるほど、ティース部非延長領域２４の周方向における伸びが抑制されるため、溝部２Ｂの長さは、例えば巻回時の曲率に応じて決定される。曲率が大きくなるほど、ティース部延長領域２３とティース部非延長領域２４との伸びの差が大きくなる傾向があるため、曲率が大きくなるほど溝部２Ｂの長さを大きくすることができる。溝部２Ｂは、ティース部非延長領域２４に形成されるが、溝部２Ｂの両端がティース部延長領域２３に達していてもよい。ただし、ティース部延長領域２３には、溝部非形成部２１Ｂが存在することが好ましい。 The groove portion 2B is formed along the extension direction L (that is, the longitudinal direction L) of the yoke portion 2. In other words, the groove portion 2B extends along a direction orthogonal to the extending direction of the teeth portion 3. The formation of the groove portion 2B suppresses the elongation of the tooth portion non-extending region 24 in the circumferential direction during winding in the molding process. As the length of the groove 2B in the extension direction L of the yoke portion 2 becomes larger, the elongation of the tooth portion non-extension region 24 in the circumferential direction is suppressed. Therefore, the length of the groove 2B depends on, for example, the curvature at the time of winding. It is determined. As the curvature increases, the difference in elongation between the teeth portion extension region 23 and the teeth portion non-extension region 24 tends to increase. Therefore, the length of the groove portion 2B can be increased as the curvature increases. The groove portion 2B is formed in the teeth portion non-extension region 24, but both ends of the groove portion 2B may reach the teeth portion extension region 23. However, it is preferable that the groove non-forming portion 21B is present in the tooth portion extension region 23.
　ヨーク部２に対応する箇所２Ｐには、ティース部延長領域２３に対応する箇所２３Ｐとティース部非延長領域２４に対応する箇所２４Ｐとが交互に存在する。ティース部非延長領域２４に対応する全ての箇所２４Ｐに溝部２Ｂを形成してもよいし、ティース部非延長領域２４に対応する箇所２４Ｐのうちの一部に溝部２Ｂを形成してもよい。つまり、ティース部非延長領域２４に対応する箇所２４Ｐの一部には、溝部２Ｂが形成されていない溝部非形成部を設けてもよい。 In the portion 2P corresponding to the yoke portion 2, the portion 23P corresponding to the teeth portion extension region 23 and the portion 24P corresponding to the teeth portion non-extension area 24 are alternately present. Grooves 2B may be formed in all the portions 24P corresponding to the teeth portion non-extension region 24, or groove portions 2B may be formed in a part of the portions 24P corresponding to the teeth portion non-extension region 24. That is, a groove non-forming portion in which the groove 2B is not formed may be provided in a part of the portion 24P corresponding to the tooth portion non-extension region 24.
　各ティース部非延長領域２４には、溝部２Ｂを１本ずつ形成してもよいし、溝部２Ｂを複数形成してもよい。溝部２Ｂを２本以上形成する場合には、例えば相互に平行な溝部２Ｂを形成することができる。 One groove portion 2B may be formed in each tooth portion non-extension region 24, or a plurality of groove portions 2B may be formed. When two or more groove portions 2B are formed, for example, groove portions 2B parallel to each other can be formed.
　図１９（ａ）に示すように、ヨーク部２の延び方向Ｌにおける溝部２Ｂの長さＢ1は、３．０ｍｍ以上、スロット幅以下であることが好ましい。この場合には、ティース部非延長領域２４をティース部延長領域２３と同等の変形抵抗に上げることができる。この効果が向上するという観点から、溝部２Ｂの長さＢ1は、スロット幅以下であることがより好ましい。なお、スロット幅は、ティース部非延長領域２４の幅のことである。また、図１９（ｂ）に示すように、ヨーク部２の幅方向Ｗにおける溝部２Ｂの長さＢ2は、例えば０．１ｍｍ程度である。溝部２Ｂの長さＢ1、Ｂ2は、各方向での最大長さである。 As shown in FIG. 19A, the length B 1 of the groove portion 2B in the extending direction L of the yoke portion 2 is preferably 3.0 mm or more and not more than the slot width. In this case, the teeth portion non-extension region 24 can be increased to the same deformation resistance as the teeth portion extension region 23. From the viewpoint of improving this effect, the length B 1 of the groove portion 2B is more preferably equal to or less than the slot width. The slot width is the width of the teeth portion non-extension region 24. Further, as shown in FIG. 19B, the length B 2 of the groove portion 2B in the width direction W of the yoke portion 2 is, for example, about 0.1 mm. The lengths B 1 and B 2 of the groove 2B are the maximum lengths in each direction.
　図１９（ｂ）に示すように、溝部２Ｂの深さＢ3は、板厚の３０％以下であることが好ましい。この場合には、巻回成形後に溝が埋まり、隙間の発生を抑制することができる。この効果が向上するという観点から、溝部２Ｂの深さＢ3は、板厚の３０％以下であることがより好ましく、板厚に対して曲率と同じ割合の深さ以下であることがさらに好ましい。溝部２Ｂの深さＢ3は、溝部２Ｂの最大深さである。 As shown in FIG. 19B, the depth B 3 of the groove 2B is preferably 30% or less of the plate thickness. In this case, the groove is filled after the winding molding, and the generation of a gap can be suppressed. From the viewpoint of improving this effect, the depth B 3 of the groove 2B is more preferably 30% or less of the plate thickness, and further preferably not more than the depth of the same ratio as the curvature with respect to the plate thickness. .. The depth B 3 of the groove 2B is the maximum depth of the groove 2B.
　各ティース部非延長領域２４に対応する箇所２４Ｐには、溝部２Ｂを１本形成することもできるが、２本以上形成してもよい。溝部２Ｂを２本以上形成する場合には、例えば相互に平行な関係にある２本以上の溝部２Ｂを形成することができる。溝部２Ｂの数が増えるほど、成形工程での巻回時に、ティース部非延長領域２４の周方向Ｘにおける伸びが抑制されるため、溝部２Ｂの数は、例えば巻回時の曲率に応じて決定される。曲率が大きくなるほど、溝部２Ｂの数を増やすことができる。また、実施形態３にて詳説するが、切欠き部２９がある場合には、ティース部非延長領域２４に対応する箇所２４Ｐに形成される溝部２Ｂの数を増やすことができる。 One groove portion 2B may be formed in the portion 24P corresponding to each tooth portion non-extension region 24, but two or more grooves may be formed. When two or more groove portions 2B are formed, for example, two or more groove portions 2B having a parallel relationship with each other can be formed. As the number of groove portions 2B increases, the elongation of the tooth portion non-extension region 24 in the circumferential direction X is suppressed during winding in the molding process. Therefore, the number of groove portions 2B is determined according to, for example, the curvature during winding. Will be done. The larger the curvature, the more the number of grooves 2B can be increased. Further, as will be described in detail in the third embodiment, when there is a notch portion 29, the number of groove portions 2B formed in the portion 24P corresponding to the tooth portion non-extension region 24 can be increased.
　溝部２Ｂは、上記のように、ティース部非延長領域２４に対応する箇所２４Ｐに形成される。図１８に示すように、溝部２Ｂは、ティース部非延長領域に対応する箇所２４Ｐおいて、中央線ＣＰよりも外周側Ｏ（具体的には、外周端２５に対応する箇所２５Ｐ側）に形成されることが好ましい。この場合には、溝部２Ｂによる、伸びの抑制効果が向上する。これは、中央線Ｃよりも外周側Ｏでは、ティース部非延長領域２４が巻回時に伸びやすいためである（図１９（ａ）参照）。つまり、より伸びやすい箇所に溝部２Ｂが形成されるため、溝部２Ｂの形成による伸びの抑制効果が向上する。また、成形工程での巻回時には、ヨーク部２の外周側Ｏほど伸び量が大きくなるため、溝部２Ｂを形成する位置が幅方向Ｗにおける外周側Ｏに近づくほど、溝部２Ｂの長さを長くすることが好ましい。 As described above, the groove portion 2B is formed at the portion 24P corresponding to the teeth portion non-extension region 24. As shown in FIG. 18, the groove portion 2B is formed on the outer peripheral side O (specifically, the portion 25P side corresponding to the outer peripheral end 25) with respect to the center line CP at the portion 24P corresponding to the teeth portion non-extension region. It is preferable to be done. In this case, the effect of suppressing the elongation by the groove portion 2B is improved. This is because the non-extended region 24 of the teeth portion tends to extend during winding on the outer peripheral side O of the center line C (see FIG. 19A). That is, since the groove portion 2B is formed at a portion that is more easily stretched, the effect of suppressing the elongation due to the formation of the groove portion 2B is improved. Further, during winding in the molding process, the amount of elongation increases toward the outer peripheral side O of the yoke portion 2, so that the closer the position where the groove portion 2B is formed to the outer peripheral side O in the width direction W, the longer the length of the groove portion 2B. It is preferable to do so.
　溝部２Ｂの断面形状は、特に限定されないが、例えば、図２０（ａ）～（ｃ）に示す形状にすることができる。図２０（ａ）～（ｃ）は、ヨーク部における幅方向Ｗでの溝部２Ｂの断面を示す。 The cross-sectional shape of the groove portion 2B is not particularly limited, but can be, for example, the shape shown in FIGS. 20A to 20C. 20 (a) to 20 (c) show the cross section of the groove portion 2B in the width direction W in the yoke portion.
　溝形成工程後には、実施形態１と同様に、シート形成工程、成形工程を行うことができる。これにより、回転機コア１を製造することができる。本形態の回転機コア１は、実施形態１と同様に、例えば巻出し機６１、予備成形機６２、プレス機６４、バッファー装置６５、および成形機５から構成された製造ライン６により製造される。 After the groove forming step, the sheet forming step and the forming step can be performed as in the first embodiment. Thereby, the rotary machine core 1 can be manufactured. Similar to the first embodiment, the rotary machine core 1 of the present embodiment is manufactured by a production line 6 composed of, for example, an unwinding machine 61, a preforming machine 62, a press machine 64, a buffer device 65, and a forming machine 5. ..
　溝形成工程は、例えばプレス機６４にて行うことができる。プレス機６４は、図２１に示すごとく、下金型６４２と上金型６４４とを有する。上金型６４４は、成形部６４４ｃと押さえ部６４４ｄとを有する。成形部６４４ｃの板材４０との接触面には、複数の溝形成用凸部６４４ｅが形成されている。溝形成用凸部６４４ｅは、溝部２Ｂの形状に嵌合する形状を有する。下金型６４２は、押さえ台６４２ｃから構成されている。上金型６４４及び下金型６４２が互いに接近するように相対移動するときに、板材４０が上金型６４４の押さえ部６４４ｄと下金型６４２の押さえ台６４２ｃとの間に狭持されつつ、成形部６４４ｃの溝形成用凸部６４４ｅにより、板材４０に溝部２Ｂが形成される。図２１（ａ）及び（ｂ）に示すように、多数の溝形成用凸部６４４ｅが形成された成形部６４４ｃを用いることにより、１回のプレスで多数の溝部を形成することができる。一方、図示を省略するが、１つの溝形成用凸部が形成された成形部を用いて、連続的にプレスを行って溝を１つずつ形成することも可能である。 The groove forming step can be performed by, for example, a press machine 64. As shown in FIG. 21, the press machine 64 has a lower die 642 and an upper die 644. The upper mold 644 has a molding portion 644c and a pressing portion 644d. A plurality of groove-forming convex portions 644e are formed on the contact surface of the molded portion 644c with the plate material 40. The groove-forming convex portion 644e has a shape that fits the shape of the groove portion 2B. The lower mold 642 is composed of a holding base 642c. When the upper mold 644 and the lower mold 642 move relative to each other, the plate material 40 is held between the holding portion 644d of the upper mold 644 and the holding base 642c of the lower mold 642 while being narrowed. The groove portion 2B is formed on the plate material 40 by the groove forming convex portion 644e of the molding portion 644c. As shown in FIGS. 21 (a) and 21 (b), by using the molded portion 644c in which a large number of groove forming convex portions 644e are formed, a large number of groove portions can be formed by one press. On the other hand, although not shown, it is also possible to form the grooves one by one by continuously pressing using the molded portion in which one groove-forming convex portion is formed.
　また、実施形態１と同様に、プレス機６４は、櫛状シート４を打ち抜くための下金型６４２と上金型６４４とを備えており、これらの金型により、櫛状シート４が形成される。製造ラインのその他の構成は、実施形態１と同様であり、実施形態１と同様にして回転機コア１を製造することができる。 Further, as in the first embodiment, the press machine 64 includes a lower die 642 and an upper die 644 for punching the comb-shaped sheet 4, and the comb-shaped sheet 4 is formed by these dies. To. The other configurations of the production line are the same as those in the first embodiment, and the rotary machine core 1 can be manufactured in the same manner as in the first embodiment.
　図１７、図１８に示すように、本形態では、溝形成工程においてヨーク部２の延び方向Ｌに沿って延びる少なくとも１つの溝部２Ｂを形成する。そのため、成形工程前の櫛状シート４は、ティース部非延長領域２４に溝部２Ｂを有する。溝部２Ｂが形成されたティース部非延長領域２４は、溝部２Ｂが形成されていない場合に比べて、成形工程での圧延により伸びにくくなる。つまり、溝部２Ｂが形成されていない場合、ティース部非延長領域２４は、ティース部延長領域２３に比べて伸ばされ易いが、溝部２Ｂを形成することにより伸ばされ難くなる。その結果、成形工程の圧延時に、ティース部非延長領域２４及びティース部延長領域２３の伸びが略均一化される。そのため、成形工程での螺旋状の巻回時に起こりうる径寸法のばらつきを小さくすることができる。その結果、例えば回転電機のハウジングに回転機コア１を組み付けられなくなることを防止できる。また、回転機コア１の内面及び外面に段差が発生することを防止できるため、磁気特性が低下したり、振動および異音が発生したりすることを防止できる。 As shown in FIGS. 17 and 18, in this embodiment, at least one groove portion 2B extending along the extending direction L of the yoke portion 2 is formed in the groove forming step. Therefore, the comb-shaped sheet 4 before the molding step has a groove portion 2B in the teeth portion non-extension region 24. The teeth portion non-extension region 24 in which the groove portion 2B is formed is less likely to be stretched by rolling in the molding step than in the case where the groove portion 2B is not formed. That is, when the groove portion 2B is not formed, the teeth portion non-extension region 24 is more easily stretched than the teeth portion extension region 23, but is less likely to be stretched by forming the groove portion 2B. As a result, the elongation of the teeth portion non-extension region 24 and the teeth portion extension region 23 is substantially made uniform during rolling in the molding process. Therefore, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process. As a result, for example, it is possible to prevent the rotary machine core 1 from being unable to be assembled to the housing of the rotary electric machine. Further, since it is possible to prevent a step from being generated on the inner surface and the outer surface of the rotating machine core 1, it is possible to prevent the magnetic characteristics from being deteriorated and the vibration and abnormal noise from being generated.
（変形例３）
　本例では、溝部２Ｂを予備成形機６２のローラ６２１、６２２により形成する例について説明する。図２２（ａ）、（ｂ）に示すように、本例の予備成形機６２は、第１ローラ６２１及び第２ローラ６２２を有している。第１ローラ６２１は、ローラ面６２１ｂに溝部形成用の凸部６２１ｃを有している。第２ローラ６２２は、円筒状であり、ローラ面は平坦である。板材４０が第１ローラ６２１のローラ面６２１ｂに形成された凸部６２１ｃと第２ローラ６２２とに挟まれることにより、溝部２Ｂが形成される。 (Modification example 3)
In this example, an example in which the groove portion 2B is formed by the rollers 621 and 622 of the preforming machine 62 will be described. As shown in FIGS. 22A and 22B, the preforming machine 62 of this example has a first roller 621 and a second roller 622. The first roller 621 has a convex portion 621c for forming a groove on the roller surface 621b. The second roller 622 has a cylindrical shape, and the roller surface is flat. The groove portion 2B is formed by sandwiching the plate material 40 between the convex portion 621c formed on the roller surface 621b of the first roller 621 and the second roller 622.
　本例のように、予備成形機６２で溝部２Ｂを形成する場合には、プレス機６４で溝部２Ｂを形成する必要はない。プレス機６４では、櫛状シート４の打ち抜きが行われる。その他は、実施形態２と同様にして回転機コア１を製造することができる。 When the groove portion 2B is formed by the preforming machine 62 as in this example, it is not necessary to form the groove portion 2B by the press machine 64. In the press machine 64, the comb-shaped sheet 4 is punched out. Other than that, the rotary machine core 1 can be manufactured in the same manner as in the second embodiment.
（変形例４）
　本例は、実施形態１における溝形成工程とシート形成工程との順序を入れ替えた例である。図２３に示されるように、まず、板材４０から、ヨーク部２とティース部３とを有する櫛状シート４を打ち抜く。 (Modification example 4)
This example is an example in which the order of the groove forming step and the sheet forming step in the first embodiment is changed. As shown in FIG. 23, first, the comb-shaped sheet 4 having the yoke portion 2 and the teeth portion 3 is punched out from the plate material 40.
　次いで、図２３、図２４に示すように、櫛状シート４のヨーク部２に溝部２Ｂを形成する。変形例２において示したように、ヨーク部２には、ティース部延長領域２３と、ティース部非延長領域２４とが存在する。溝部２Ｂは、ヨーク部２のティース部非延長領域２４に形成される。溝部２Ｂは、実施形態２、変形例３と同様にして形成することができる。 Next, as shown in FIGS. 23 and 24, a groove portion 2B is formed in the yoke portion 2 of the comb-shaped sheet 4. As shown in the second modification, the yoke portion 2 has a teeth portion extension region 23 and a teeth portion non-extension region 24. The groove portion 2B is formed in the teeth portion non-extension region 24 of the yoke portion 2. The groove portion 2B can be formed in the same manner as in the second embodiment and the third modification.
　本例のように、溝形成工程とシート形成工程との順序を入れ替えても、成形工程前の櫛状シート４に張出部２Ａが形成されるため、実施形態２と同様の効果が得られる。 Even if the order of the groove forming step and the sheet forming step is changed as in this example, the overhanging portion 2A is formed on the comb-shaped sheet 4 before the forming step, so that the same effect as that of the second embodiment can be obtained. ..
（実施形態３）
　切欠き部２９を有する回転機コア１に溝部２Ｂを形成する形態について説明する。図２５、図２６に示すように、本形態の回転機コア１は、外周側Ｏの側面に切欠き部２９を有する。螺旋状に巻回された櫛状シート４において、切欠き部２９は、ヨーク部２に形成されている。切欠き部２９は、回転機コア１の周方向Ｘと直交方向（すなわち径方向Ｙ）にへこんだ部分である。切欠き部２９では、周囲よりもヨーク部２の幅が小さくなっている。切欠き部２９の形状は、特に限定されない。 (Embodiment 3)
A mode in which the groove portion 2B is formed in the rotary machine core 1 having the notch portion 29 will be described. As shown in FIGS. 25 and 26, the rotary machine core 1 of the present embodiment has a notch 29 on the side surface of the outer peripheral side O. In the spirally wound comb-shaped sheet 4, the notch portion 29 is formed in the yoke portion 2. The notch portion 29 is a portion of the rotating machine core 1 that is recessed in a direction orthogonal to the circumferential direction X (that is, the radial direction Y). In the notch portion 29, the width of the yoke portion 2 is smaller than that of the periphery. The shape of the notch 29 is not particularly limited.
　図２５、図２６では、切欠き部２９はヨーク部２における外周側Ｏに形成されているが、内周側Ｉに形成することもできる。換言すれば、図２５、図２６では、切欠き部２９は、ヨーク部２における第２端２２に形成されているが、第１端２１に形成することもできる。 In FIGS. 25 and 26, the notch portion 29 is formed on the outer peripheral side O of the yoke portion 2, but it can also be formed on the inner peripheral side I. In other words, in FIGS. 25 and 26, the notch portion 29 is formed at the second end 22 of the yoke portion 2, but it can also be formed at the first end 21.
　切欠き部２９は、例えばヨーク部２におけるティース部延長領域２３、ティース部非延長領域２４に形成される。図２６、図２７に示すように、切欠き部２９がティース部非延長領域２４に形成される場合であって、溝部２Ｂがティース部非延長領域２４に形成される場合には、切欠き部２９が形成されたティース部非延長領域２４には、切欠き部２９が形成されていないティース部非延長領域２４よりも、多くの溝部２Ｂを形成することが好ましい。 The notch portion 29 is formed in, for example, the teeth portion extension region 23 and the teeth portion non-extension region 24 in the yoke portion 2. As shown in FIGS. 26 and 27, when the notch portion 29 is formed in the teeth portion non-extension region 24 and the groove portion 2B is formed in the teeth portion non-extension region 24, the notch portion is formed. It is preferable to form more groove portions 2B in the teeth portion non-extension region 24 in which the 29 is formed than in the teeth portion non-extension region 24 in which the notch portion 29 is not formed.
　本形態の回転機コア１は、シート形成工程と、溝形成工程と、成形工程とを行うことにより製造される。切欠き部は、例えばシート形成工程で形成される。具体的には、シート形成工程において、ヨーク部２のティース部非延長領域２４における外周端２５に切欠き部２９を有する櫛状シート４を打ち抜く。つまり、ヨーク部２とティース部３と切欠き部２９を有する櫛状シート４を打ち抜く。 The rotary machine core 1 of this embodiment is manufactured by performing a sheet forming step, a groove forming step, and a forming step. The notch is formed, for example, in the sheet forming step. Specifically, in the sheet forming step, the comb-shaped sheet 4 having the notch portion 29 at the outer peripheral end 25 in the teeth portion non-extension region 24 of the yoke portion 2 is punched out. That is, the comb-shaped sheet 4 having the yoke portion 2, the teeth portion 3, and the notch portion 29 is punched out.
　溝形成工程では、櫛状シート４における切欠き部２９が形成されたティース部非延長領域２４に例えば２本の溝部２Ｂを形成し、切欠き部２９が形成されていないティース部非延長領域２４には１本の溝部２Ｂを形成することができる。この場合には、成形工程での巻回時に、ティース部非延長領域２４の周方向Ｘにおける伸びが、切欠き部２９が形成された位置でも、切欠き部２９が形成されていない位置でも略均一に抑制される。その結果、成形工程の圧延時に、ティース部非延長領域２４及びティース部延長領域２３の伸びが略均一化される。これにより、切欠き部２９が形成されている場合であっても、成形工程での螺旋状の巻回時に起こりうる径寸法のばらつきを小さくすることができる。 In the groove forming step, for example, two groove portions 2B are formed in the tooth portion non-extension region 24 in which the notch portion 29 is formed in the comb-shaped sheet 4, and the teeth portion non-extension region 24 in which the notch portion 29 is not formed is formed. Can form one groove 2B. In this case, at the time of winding in the molding step, the elongation of the tooth portion non-extension region 24 in the circumferential direction X is substantially equal to the position where the notch portion 29 is formed or the position where the notch portion 29 is not formed. It is suppressed uniformly. As a result, the elongation of the teeth portion non-extension region 24 and the teeth portion extension region 23 is substantially made uniform during rolling in the molding process. As a result, even when the notch portion 29 is formed, it is possible to reduce the variation in diameter dimension that may occur during spiral winding in the molding process.
　切欠き部２９が形成されたティース部非延長領域２４では、外周側Ｏほど、溝部２Ｂの長さＢ1を長くすることが好ましい。これは、成形工程での巻回時には外周側Ｏほどヨーク部２の伸び量が大きくなり、溝部２Ｂの長さを長くするほどその伸び量を抑制できるからである。つまり、この場合には、成形工程での巻回時におこりうる径寸法のばらつきをより小さくすることができる。なお、溝部２Ｂの長さＢ1は、ヨーク部２の延び方向Ｌにおける長さである。 In the teeth portion non-extension region 24 in which the notch portion 29 is formed, it is preferable to lengthen the length B 1 of the groove portion 2B toward the outer peripheral side O. This is because the amount of elongation of the yoke portion 2 increases toward the outer peripheral side O during winding in the molding process, and the amount of elongation can be suppressed as the length of the groove portion 2B becomes longer. That is, in this case, it is possible to further reduce the variation in diameter dimension that may occur during winding in the molding process. The length B 1 of the groove portion 2B is the length of the yoke portion 2 in the extending direction L.
　ヨーク部２の延び方向Ｌにおける切欠き部２９の長さＣ1、ヨーク部２の幅方向Ｗにおける切欠き部の長さＣ2は、適宜調整可能である。長さＣ1、長さＣ2は各方向での切欠き部の最大長さである。切欠き部２９の長さＣ1及び長さＣ2が大きくなるほど、切欠き部２９が形成された位置でのヨーク部２が伸び易くなる。したがって、切欠き部２９の長さＣ1及び長さＣ2が大きくなるほど、溝部の長さＢ1を大きくすることが好ましい。 The length C 1 of the notch portion 29 in the extending direction L of the yoke portion 2 and the length C 2 of the notch portion in the width direction W of the yoke portion 2 can be appropriately adjusted. Length C 1 and length C 2 are the maximum lengths of the notches in each direction. The larger the length C 1 and the length C 2 of the notch portion 29, the easier it is for the yoke portion 2 to extend at the position where the notch portion 29 is formed. Therefore, it is preferable to increase the length B 1 of the groove portion as the length C 1 and the length C 2 of the notch portion 29 become larger.
　図２８に示すように、切欠き部２９の両端がティース部延長領域２３に達している場合には、溝部２Ｂの両端もティース部延長領域２３に達していてもよい。また、切欠き部２９と溝部２Ｂとが重なっていてもよい。 As shown in FIG. 28, when both ends of the notch portion 29 reach the teeth portion extension region 23, both ends of the groove portion 2B may also reach the teeth portion extension region 23. Further, the notch portion 29 and the groove portion 2B may overlap.
　溝部２Ｂは、実施形態２と同様にプレス機６４により形成することができる。また、溝部２Ｂは、変形例３のように、予備成形機６２にて形成することもできる。 The groove portion 2B can be formed by the press machine 64 as in the second embodiment. Further, the groove portion 2B can also be formed by the preforming machine 62 as in the modified example 3.
　また、図示を省略するが、シート形成工程と溝形成工程とは入れ替えることができる。つまり、実施形態２と同様に、溝形成工程後に、シート形成工程を行うことができる。この場合には、板材４０における切欠き部２９が形成されるティース部非延長領域２４に対応する箇所２４Ｐに、切欠き部２９が形成されない上記ティース部非延長領域２４に対応する箇所２４Ｐよりも多く溝部２Ｂを形成すればよい。 Although not shown, the sheet forming process and the groove forming process can be interchanged. That is, as in the second embodiment, the sheet forming step can be performed after the groove forming step. In this case, the portion 24P of the plate material 40 corresponding to the teeth portion non-extension region 24 in which the notch portion 29 is formed is more than the portion 24P corresponding to the teeth portion non-extension region 24 in which the notch portion 29 is not formed. Many grooves 2B may be formed.
（実施形態４）
　板材４０のティース部非延長領域２４に対応する箇所２４Ｐに、薄肉部２Ｃを形成する形態について説明する。本形態では、図２９に示すように、ティース部延長領域２３に張出部２Ａが形成されておらず、ティース部非延長領域２４に薄肉部２Ｃを有する点を除き、実施形態１と同様の形状の回転機コア１を製造する。ティース部非延長領域２４の薄肉部２Ｃは、周囲よりも厚みの小さな部分である。薄肉部２Ｃは、例えばティース部延長領域２３よりも厚みの小さい部分である。ティース部延長領域２３には、薄肉部２Ｃを形成する必要はない。つまり、ティース部延長領域２３には、薄肉部非形成領域を設けることができる。薄肉部非形成領域は、薄肉部が形成されていない領域である。 (Embodiment 4)
A form in which the thin-walled portion 2C is formed at the portion 24P corresponding to the tooth portion non-extension region 24 of the plate material 40 will be described. In this embodiment, as shown in FIG. 29, the same as in the first embodiment except that the overhanging portion 2A is not formed in the tooth portion extension region 23 and the thin-walled portion 2C is provided in the tooth portion non-extension region 24. A rotating machine core 1 having a shape is manufactured. The thin portion 2C of the tooth portion non-extension region 24 is a portion having a thickness smaller than the periphery. The thin portion 2C is a portion having a thickness smaller than, for example, the teeth portion extension region 23. It is not necessary to form the thin portion 2C in the tooth portion extension region 23. That is, the tooth portion extension region 23 can be provided with a thin-walled portion non-forming region. The thin-walled portion non-formed region is a region in which the thin-walled portion is not formed.
　回転機コア１は、薄肉化工程と、シート形成工程と、成形工程を行い、次の手順で製造される。薄肉部２Ｃは、シート形成後の櫛状シート４に対して形成してもよいし、シート形成工程前の板材４０に対して形成してもよい。つまり、成形工程前に薄肉部２Ｃが形成されていればよい。本形態では、板材４０に対して薄肉部２Ｃを形成する場合について説明する。 The rotary machine core 1 is manufactured by the following procedure after performing a thinning step, a sheet forming step, and a molding step. The thin portion 2C may be formed on the comb-shaped sheet 4 after the sheet is formed, or may be formed on the plate material 40 before the sheet forming step. That is, it suffices that the thin-walled portion 2C is formed before the molding step. In this embodiment, a case where the thin portion 2C is formed with respect to the plate material 40 will be described.
　図３０～図３２に示すように、薄肉化工程では、板材４０に薄肉部２Ｃを形成する。薄肉部２Ｃは、例えば板材４０を潰すことにより形成することができる。図３１に示すように、薄肉部２Ｃは、板材４０のヨーク部２に対応する箇所２Ｐにおけるティース部非延長領域２４に対応する箇所２４Ｐに形成する。ティース部延長領域２３に対応する箇所２３Ｐには、薄肉部２Ｃを形成しない。つまり、ティース部延長領域２３に対応する箇所２３Ｐには、薄肉部非形成領域が存在する。 As shown in FIGS. 30 to 32, in the thinning step, the thinned portion 2C is formed on the plate material 40. The thin portion 2C can be formed, for example, by crushing the plate material 40. As shown in FIG. 31, the thin-walled portion 2C is formed at the portion 24P corresponding to the teeth portion non-extension region 24 in the portion 2P corresponding to the yoke portion 2 of the plate material 40. The thin portion 2C is not formed at the portion 23P corresponding to the tooth portion extension region 23. That is, the thin-walled portion non-forming region exists in the portion 23P corresponding to the tooth portion extension region 23.
　薄肉部２Ｃは、板厚の小さい部分である。薄肉部２Ｃでは、成形工程での圧延により潰される材料が少ない。そのため、薄肉部２Ｃが形成されたティース部非延長領域２４では、ティース部延長領域２３に比べて周方向Ｘへの伸びが抑制される。薄肉部２Ｃの厚みが小さくなるほど、成形工程で潰される量が少なくなって伸びが抑制されるため、薄肉部２Ｃの厚みは、例えば巻回時の曲率に応じて決定される。曲率が大きくなるほど、ティース部延長領域２３とティース部非延長領域２４との伸びの差が大きくなる傾向があるため、曲率が大きくなるほど薄肉部２Ｃの厚みを小さくすることができる。 The thin part 2C is a part with a small plate thickness. In the thin portion 2C, less material is crushed by rolling in the molding process. Therefore, in the teeth portion non-extension region 24 in which the thin-walled portion 2C is formed, the elongation in the circumferential direction X is suppressed as compared with the teeth portion extension region 23. As the thickness of the thin-walled portion 2C becomes smaller, the amount crushed in the molding process is reduced and the elongation is suppressed. Therefore, the thickness of the thin-walled portion 2C is determined, for example, according to the curvature at the time of winding. As the curvature increases, the difference in elongation between the teeth portion extension region 23 and the teeth portion non-extension region 24 tends to increase. Therefore, the thickness of the thin portion 2C can be reduced as the curvature increases.
　図３１に示すように、ヨーク部２に対応する箇所２Ｐには、ティース部延長領域２３に対応する箇所２３Ｐとティース部非延長領域２４に対応する箇所２４Ｐとが交互に存在する。図２９及び図３０に示すように、ティース部非延長領域２４に対応する全ての箇所２４Ｐに薄肉部２Ｃを形成してもよいが、図示を省略するが、ティース部非延長領域２４に対応する箇所２４Ｐのうちの一部に薄肉部２Ｃを形成してもよい。つまり、ティース部非延長領域２４に対応する各箇所２４Ｐに薄肉部２Ｃを形成してもよいし、ティース部非延長領域２４に対応する箇所２４Ｐの一部には、薄肉部非形成部を設けてもよい。薄肉部非形成部は、薄肉部２Ｃが形成されていない部分である。図２９～図３１に示すように、ティース部延長領域２３、ティース部延長領域２３に対応する箇所２３Ｐには、薄肉部非形成部２１Ｃを形成することができる。また、ティース部３、ティース部３に対応する箇所３Ｐにも、薄肉部非形成部２１Ｃを形成することができる。 As shown in FIG. 31, the portion 2P corresponding to the yoke portion 2 has a portion 23P corresponding to the teeth portion extension region 23 and a portion 24P corresponding to the teeth portion non-extension area 24 alternately. As shown in FIGS. 29 and 30, thin-walled portions 2C may be formed at all locations 24P corresponding to the teeth portion non-extension region 24, but although not shown, they correspond to the teeth portion non-extension region 24. A thin portion 2C may be formed in a part of the portion 24P. That is, a thin-walled portion 2C may be formed at each portion 24P corresponding to the teeth portion non-extension region 24, or a thin-walled portion non-forming portion is provided at a part of the portion 24P corresponding to the teeth portion non-extension region 24. You may. The thin-walled portion non-formed portion is a portion where the thin-walled portion 2C is not formed. As shown in FIGS. 29 to 31, a thin-walled portion non-forming portion 21C can be formed in the teeth portion extension region 23 and the portion 23P corresponding to the teeth portion extension region 23. Further, the thin-walled portion non-forming portion 21C can also be formed at the teeth portion 3 and the portion 3P corresponding to the teeth portion 3.
　薄肉部２Ｃと薄肉部非形成部２１Ｃとの境界には、垂直面を設けてもよいし、傾斜面を設けてもよい。例えば、薄肉部２Ｃと薄肉部非形成部２１Ｃとの境界に傾斜面を設けることができる。 A vertical surface may be provided or an inclined surface may be provided at the boundary between the thin-walled portion 2C and the thin-walled portion non-forming portion 21C. For example, an inclined surface can be provided at the boundary between the thin-walled portion 2C and the thin-walled portion non-forming portion 21C.
　図３２（ａ）～（ｃ）に示すように、薄肉部２Ｃにおける厚みＤ1は、板材４０の板厚の７０％以上であることが好ましい。換言すれば、薄肉部２Ｃにおける減厚幅Ｄ2は、板材４０の板厚Ｔ1の３０％以下であることが好ましい。この場合には、巻回成形における圧延量を低減させ、曲率を小さくすることができる。この効果が向上するという観点から、薄肉部２Ｃにおける厚みＤ1は、板材４０の板厚Ｔ1の９０％以上であることがより好ましい。厚みＤ1は薄肉部２Ｃにおける最小厚みであり、減厚幅Ｄ2は最大幅である。なお、板材４０の板厚Ｔ1は、薄肉化工程前のもともとの板材４０の厚みであり、例えば薄肉部非形成部２１Ｃにおける厚みである。厚みＤ1と減厚幅Ｄ2との合計は、板材４０の板厚Ｔ1となる。減厚幅Ｄ2は、例えば０．０１ｍｍ以上であり、薄肉化工程前の板材４０の板厚Ｔ1は、例えば０．３５～０．５０ｍｍである。 As shown in FIGS. 32 (a) to 32 (c), the thickness D 1 in the thin portion 2C is preferably 70% or more of the plate thickness of the plate material 40. In other words, the thickness reduction width D 2 in the thin portion 2C is preferably 30% or less of the plate thickness T 1 of the plate material 40. In this case, the rolling amount in winding molding can be reduced and the curvature can be reduced. From the viewpoint of improving this effect, the thickness D 1 in the thin portion 2C is more preferably 90% or more of the plate thickness T 1 of the plate material 40. The thickness D 1 is the minimum thickness in the thin portion 2C, and the thickness reduction width D 2 is the maximum width. The plate thickness T 1 of the plate material 40 is the original thickness of the plate material 40 before the thinning step, for example, the thickness of the thin-walled portion non-forming portion 21C. The sum of the thickness D 1 and the reduced width D 2 is the plate thickness T 1 of the plate material 40. The thickness reduction width D 2 is, for example, 0.01 mm or more, and the plate thickness T 1 of the plate material 40 before the thinning step is, for example, 0.35 to 0.50 mm.
　図３２（ｃ）に示すように、櫛状シート４でのヨーク部２の延び方向Ｌにおける薄肉部２Ｃの長さＤ3は、スロット幅以下であることが好ましい。この場合には、ティース部非延長領域２４における、巻回成形でのヨーク部２の外周端２５側とヨーク部２の内周端２６側の潰し量割合を、ティース部延長領域２３と同等にすることができる。また、ヨーク部２の幅方向Ｗにおける薄肉部２Ｃの長さＤ4は、外周端２５側からヨーク部２の幅の１／２以上、ヨーク部２の幅以下であることが好ましい。この場合には、潰し量の大きいヨーク部２の外周端２５側の潰し量割合を減らし、曲率を小さくできる。この効果が向上するという観点から、ヨーク部２の外周端２５から中央線Ｃまでの範囲に薄肉部２Ｃを形成することが好ましい。長さＤ3、Ｄ4は、各方向での薄肉部２Ｃの最大長さである。 As shown in FIG. 32 (c), the length D 3 of the thin portion 2C in the extending direction L of the yoke portion 2 in the comb-shaped sheet 4 is preferably not more than the slot width. In this case, in the non-extension region 24 of the teeth portion, the crushing amount ratio of the outer peripheral end 25 side of the yoke portion 2 and the inner peripheral end 26 side of the yoke portion 2 in winding molding is made equal to that of the teeth portion extension region 23. can do. Further, the length D 4 of the thin wall portion 2C in the width direction W of the yoke portion 2 is preferably ½ or more of the width of the yoke portion 2 and not more than the width of the yoke portion 2 from the outer peripheral end 25 side. In this case, the crushing amount ratio on the outer peripheral end 25 side of the yoke portion 2 having a large crushing amount can be reduced to reduce the curvature. From the viewpoint of improving this effect, it is preferable to form the thin portion 2C in the range from the outer peripheral end 25 of the yoke portion 2 to the center line C. The lengths D 3 and D 4 are the maximum lengths of the thin portion 2C in each direction.
　薄肉部２Ｃの断面形状は、特に限定されず、例えば、図３３（ａ）～（ｃ）に示すような形状にすることができる。図３３（ａ）～（ｃ）は、帯状のヨーク部２又は帯状のヨーク部２に対応する箇所２Ｐの延び方向Ｌに沿う方向での薄肉部２Ｃの断面を示す。 The cross-sectional shape of the thin-walled portion 2C is not particularly limited, and can be, for example, a shape as shown in FIGS. 33 (a) to 33 (c). FIGS. 33 (a) to 33 (c) show a cross section of the thin-walled portion 2C in the direction along the extending direction L of the strip-shaped yoke portion 2 or the portion 2P corresponding to the strip-shaped yoke portion 2.
　薄肉化工程後には、実施形態１と同様に、シート形成工程、成形工程を行うことができる。これにより、回転機コアを製造することができる。本形態の回転機コア１は、実施形態１と同様に、例えば巻出し機６１、予備成形機６２、プレス機６４、バッファー装置６５、および成形機５から構成された製造ライン６により製造される。 After the thinning step, the sheet forming step and the molding step can be performed as in the first embodiment. As a result, the rotating machine core can be manufactured. Similar to the first embodiment, the rotary machine core 1 of the present embodiment is manufactured by a production line 6 composed of, for example, an unwinding machine 61, a preforming machine 62, a press machine 64, a buffer device 65, and a forming machine 5. ..
　薄肉化工程は、例えばプレス機６４にて行うことができる。プレス機６４は、図３４に示すごとく、下金型６４２と上金型６４４とを有する。上金型６４４は、成形部６４４ｆと押さえ部６４４ｄとを有する。成形部６４４ｆの板材４０との接触面には、複数の薄肉部形成用凸部６４４ｇが形成されている。薄肉部形成用凸部６４４ｇは、薄肉部２Ｃの形状に嵌合する形状を有する。下金型６４２は、押さえ台６４２ｃから構成されている。上金型６４４および下金型６４２が互いに接近するように相対移動するときに、板材４０が上金型６４４の押さえ部６４４ｄと下金型６４２の押さえ台６４２ｃと間に狭持されつつ、成形部６４４ｆの薄肉部形成用凸部６４４ｇにより薄肉部２Ｃが形成される。図３４（ａ）及び（ｂ）に示すように、多数の薄肉部形成用凸部６４４ｇが形成された成形部６４４ｆを用いることにより、１回のプレスで多数の薄肉部２Ｃを形成することができる。一方、図示を省略するが、１つの薄肉部形成用凸部が形成された成形部を用いて、連続的にプレスを行って凸部を１つずつ形成することも可能である。 The thinning step can be performed by, for example, a press machine 64. As shown in FIG. 34, the press machine 64 has a lower die 642 and an upper die 644. The upper mold 644 has a molding portion 644f and a pressing portion 644d. A plurality of thin-walled portion forming convex portions 644 g are formed on the contact surface of the molded portion 644f with the plate material 40. The thin-walled portion forming convex portion 644 g has a shape that fits the shape of the thin-walled portion 2C. The lower mold 642 is composed of a holding base 642c. When the upper mold 644 and the lower mold 642 move relative to each other, the plate material 40 is formed while being sandwiched between the holding portion 644d of the upper mold 644 and the holding base 642c of the lower mold 642. The thin-walled portion 2C is formed by the convex portion 644g for forming the thin-walled portion of the portion 644f. As shown in FIGS. 34 (a) and 34 (b), a large number of thin-walled portions 2C can be formed in one press by using the molded portion 644f in which a large number of thin-walled portion forming convex portions 644 g are formed. it can. On the other hand, although not shown, it is also possible to form the convex portions one by one by continuously pressing the molded portion in which one convex portion for forming a thin wall portion is formed.
　また、実施形態１と同様に、プレス機６４は、櫛状シート４を打ち抜くための下金型６４２と上金型６４４を備えており、これらの金型により、櫛状シート４が形成される。製造ラインのその他の構成は、実施形態１と同様であり、実施形態１と同様にして回転機コア１を製造することができる。 Further, as in the first embodiment, the press machine 64 includes a lower die 642 and an upper die 644 for punching the comb-shaped sheet 4, and the comb-shaped sheet 4 is formed by these dies. .. The other configurations of the production line are the same as those in the first embodiment, and the rotary machine core 1 can be manufactured in the same manner as in the first embodiment.
　図３０、図３１、図３２（ａ）～（ｃ）に示すように、本形態では、薄肉化工程において、ティース部非延長領域２４に対応する箇所２４Ｐに薄肉部２Ｃを形成する。そのため、成形工程前の櫛状シート４は、ティース部非延長領域２４に薄肉部２Ｃを有する。薄肉部２Ｃが形成されたティース部非延長領域２４は、ティース部延長領域２３に比べて、圧延により伸ばされる材料が少ないため、成形工程での圧延時に伸びにくくなる。その結果、成形工程での圧延時に、ティース部非延長領域２４及びティース部延長領域２３の伸びが略均一化される。そのため、成形工程での螺旋状の巻回時に起こりうる径寸法のばらつきを小さくすることができる。その結果、例えば回転電機のハウジングに回転機コア１を組み付けられなくなることを防止できる。また、回転機コア１の内面及び外面に段差が発生することを防止できるため、磁気特性が低下したり、振動および異音が発生したりすることを防止できる。 As shown in FIGS. 30, 31, and 32 (a) to 32 (c), in the present embodiment, the thin wall portion 2C is formed at the portion 24P corresponding to the tooth portion non-extension region 24 in the thinning step. Therefore, the comb-shaped sheet 4 before the molding step has a thin-walled portion 2C in the teeth portion non-extension region 24. The teeth portion non-extension region 24 in which the thin-walled portion 2C is formed has less material to be stretched by rolling than the teeth portion extension region 23, and therefore is less likely to be stretched during rolling in the forming step. As a result, the elongation of the teeth portion non-extension region 24 and the teeth portion extension region 23 is substantially made uniform during rolling in the molding step. Therefore, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process. As a result, for example, it is possible to prevent the rotary machine core 1 from being unable to be assembled to the housing of the rotary electric machine. Further, since it is possible to prevent a step from being generated on the inner surface and the outer surface of the rotating machine core 1, it is possible to prevent the magnetic characteristics from being deteriorated and the vibration and abnormal noise from being generated.
（変形例５）
　本例では、薄肉部２Ｃを予備成形機６２のローラ６２１、６２２により形成する例について説明する。図３５（ａ）、（ｂ）に示すように、本例の予備成形機６２は、第１ローラ６２１及び第２ローラ６２２を有している。第１ローラ６２１は、ローラ面６２１ｂに薄肉部形成用の凸部６２１ｄを有している。第２ローラ６２２は、変形例３と同様に円筒状であり、ローラ面は平坦である。板材４０が第１ローラ６２１のローラ面６２１ｂに形成された凸部６２１ｄと第２ローラ６２２とに挟まれることにより、薄肉部２Ｃが形成される。 (Modification 5)
In this example, an example in which the thin portion 2C is formed by the rollers 621 and 622 of the preforming machine 62 will be described. As shown in FIGS. 35 (a) and 35 (b), the preforming machine 62 of this example has a first roller 621 and a second roller 622. The first roller 621 has a convex portion 621d for forming a thin wall portion on the roller surface 621b. The second roller 622 has a cylindrical shape as in the modified example 3, and the roller surface is flat. The thin portion 2C is formed by sandwiching the plate material 40 between the convex portion 621d formed on the roller surface 621b of the first roller 621 and the second roller 622.
　本例のように、予備成形機６２で薄肉部２Ｃを形成する場合には、プレス機６４で薄肉部２Ｃを形成する必要はない。プレス機６４では、櫛状シート４の打ち抜きが行われる。その他は、実施形態４と同様にして回転機コア１を製造することができる。 When the thin-walled portion 2C is formed by the preforming machine 62 as in this example, it is not necessary to form the thin-walled portion 2C by the press machine 64. In the press machine 64, the comb-shaped sheet 4 is punched out. Other than that, the rotary machine core 1 can be manufactured in the same manner as in the fourth embodiment.
（変形例６）
　本例は、実施形態１における薄肉化工程とシート形成工程との順序を入れ替えた例である。図３６に示されるように、まず、板材４０から、ヨーク部２とティース部３とを有する櫛状シート４を打ち抜く。 (Modification 6)
This example is an example in which the order of the thinning step and the sheet forming step in the first embodiment is changed. As shown in FIG. 36, first, the comb-shaped sheet 4 having the yoke portion 2 and the teeth portion 3 is punched out from the plate material 40.
　次いで、図３６、図３７に示すように、櫛状シート４のヨーク部２に薄肉部２Ｃを形成する。変形例２において示したように、ヨーク部２には、ティース部延長領域２３と、ティース部非延長領域２４とが存在する。薄肉部２Ｃは、ヨーク部２のティース部非延長領域２４に形成される。薄肉部２Ｃは、実施形態４、変形例５と同様にして形成することができる。なお、図３７は、薄肉部２Ｃが形成される前の櫛状シート４を示す。 Next, as shown in FIGS. 36 and 37, a thin portion 2C is formed on the yoke portion 2 of the comb-shaped sheet 4. As shown in the second modification, the yoke portion 2 has a teeth portion extension region 23 and a teeth portion non-extension region 24. The thin portion 2C is formed in the teeth portion non-extension region 24 of the yoke portion 2. The thin-walled portion 2C can be formed in the same manner as in the fourth embodiment and the fifth modification. Note that FIG. 37 shows the comb-shaped sheet 4 before the thin-walled portion 2C is formed.
　本例のように、薄肉化工程とシート形成工程との順序を入れ替えても、成形工程前の櫛状シート４に薄肉部２Ｃが形成されるため、実施形態４と同様の効果が得られる。 Even if the order of the thinning step and the sheet forming step is changed as in this example, the thinning portion 2C is formed on the comb-shaped sheet 4 before the forming step, so that the same effect as that of the fourth embodiment can be obtained.
（実施形態５）
　ヨーク部２における切欠き部２９が形成された位置に溝部２Ｂを形成する形態について説明する。本形態では、実施形態３と同様に回転機コア１に切欠き部２９を形成する。そして、図３８に示すように、ヨーク部２における切欠き部２９が形成された位置に溝部２Ｂを形成する。以下に本形態を詳説する。 (Embodiment 5)
A mode in which the groove portion 2B is formed at the position where the notch portion 29 is formed in the yoke portion 2 will be described. In the present embodiment, the notch portion 29 is formed in the rotary machine core 1 as in the third embodiment. Then, as shown in FIG. 38, the groove portion 2B is formed at the position where the notch portion 29 is formed in the yoke portion 2. This form will be described in detail below.
　本形態の回転機コア１は、シート形成工程、溝形成工程、及び成形工程を行い、次の手順で製造される。溝部２Ｂは、シート形成後の櫛状シート４に対して形成してもよいし、シート形成工程前の板材４０に対して形成してもよい。つまり、成形工程前に溝部２Ｂが形成されていればよい。本形態では、櫛状シート４に対して溝部２Ｂを形成する場合について説明する。 The rotary machine core 1 of this embodiment is manufactured by the following procedure after performing a sheet forming step, a groove forming step, and a forming step. The groove portion 2B may be formed on the comb-shaped sheet 4 after the sheet is formed, or may be formed on the plate material 40 before the sheet forming step. That is, it is sufficient that the groove portion 2B is formed before the molding process. In this embodiment, a case where the groove portion 2B is formed on the comb-shaped sheet 4 will be described.
　図３９に示すように、シート形成工程では、実施形態３と同様に、板材４０からヨーク部２とティース部３と切欠き部２９を有する櫛状シート４を打ち抜く。切欠き部２９は、ヨーク部２のティース部非延長領域２４に形成してもよいし、ティース部延長領域２３に形成してもよい。切欠き部２９は、例えばヨーク部２の外周端２５に形成するが、内周端２６に形成することもできる。図３９では、切欠き部２９は、ヨーク部２における第２端２２に形成されているが、第１端２１に形成することもできる。 As shown in FIG. 39, in the sheet forming step, the comb-shaped sheet 4 having the yoke portion 2, the teeth portion 3 and the notch portion 29 is punched out from the plate material 40 as in the third embodiment. The notch portion 29 may be formed in the teeth portion non-extension region 24 of the yoke portion 2, or may be formed in the teeth portion extension region 23. The notch portion 29 is formed at, for example, the outer peripheral end 25 of the yoke portion 2, but can also be formed at the inner peripheral end 26. In FIG. 39, the notch portion 29 is formed at the second end 22 of the yoke portion 2, but it can also be formed at the first end 21.
　図３９、図４０に示すように、溝形成工程では、櫛状シート４のヨーク部２における切欠き部２９の形成位置に溝部２Ｂを形成する。複数の切欠き部２９がある場合には、全ての切欠き部２９の形成位置に溝部２Ｂを形成してもよいし、切欠き部２９の形成位置のうちの一部に溝部２Ｂを形成してもよい。また、各切欠き部２９の形成位置には、１つの溝部２Ｂを形成してもよいし、例えば実施形態３のように複数の溝部２Ｂを形成してもよい。ヨーク部２の延び方向Ｌにおける溝部２Ｂの長さＢ1は、適宜調整可能であるが、例えば、ヨーク部２の延び方向Ｌにおける切欠き部２９の長さと同程度にすることができる。溝部２Ｂのその他寸法については、実施形態２、実施形態３と同様である。 As shown in FIGS. 39 and 40, in the groove forming step, the groove portion 2B is formed at the forming position of the notch portion 29 in the yoke portion 2 of the comb-shaped sheet 4. When there are a plurality of notch portions 29, the groove portions 2B may be formed at all the notch portions 29 forming positions, or the groove portions 2B may be formed at a part of the notch portions 29 forming positions. You may. Further, one groove portion 2B may be formed at the formation position of each notch portion 29, or a plurality of groove portions 2B may be formed as in the third embodiment. The length B 1 of the groove portion 2B in the extension direction L of the yoke portion 2 can be adjusted as appropriate, but can be, for example, about the same as the length of the notch portion 29 in the extension direction L of the yoke portion 2. The other dimensions of the groove portion 2B are the same as those in the second and third embodiments.
　溝形成工程では、実施形態２のように、プレス機６４にて溝部２Ｂを形成することができる。構成の図示を省略するが、プレス機６４の溝形成用凸部６４４ｅの間隔を変更することにより、切欠き部２９の形成位置に溝部２Ｂを形成することができる。また、変形例３と同様に、予備成形機６２のローラ３２１、６２２により溝部２Ｂを形成することもできる。構成の図示を省略するが、ローラの溝部形成用の凸部６２１ｃの間隔を変更することにより、切欠き部２９の形成位置に溝部２Ｂを形成することができる。 In the groove forming step, the groove portion 2B can be formed by the press machine 64 as in the second embodiment. Although the configuration is not shown, the groove portion 2B can be formed at the position where the notch portion 29 is formed by changing the interval between the groove forming convex portions 644e of the press machine 64. Further, similarly to the modification 3, the groove portion 2B can be formed by the rollers 321 and 622 of the preforming machine 62. Although the configuration is not shown, the groove 2B can be formed at the position where the notch 29 is formed by changing the distance between the convex portions 621c for forming the groove of the roller.
　溝形成工程後、実施形態１と同様に成形工程を行って櫛状シート４を巻回させることにより、回転機コア１を製造することができる。 After the groove forming step, the rotary machine core 1 can be manufactured by performing the molding step in the same manner as in the first embodiment and winding the comb-shaped sheet 4.
　本形態の溝形成工程では、櫛状シート４における切欠き部２９が形成された位置に溝部２Ｂを形成する。そのため、成形工程前の櫛状シート４は、切欠き部２９が形成された位置に溝部２Ｂを有する。溝部２Ｂは、ヨーク部２に形成されている。溝部２Ｂが形成されたヨーク部２は、溝部２Ｂが形成されてヨーク部２に比べて、成形工程での圧延時に伸びにくくなる。その結果、成形工程の圧延時に、切欠き部２９が形成されたヨーク部２の伸びが抑制され、切欠き部２９が形成された位置でのヨーク部２と切欠き部２９が形成されていない位置でのヨーク部２の伸びが略均一化される。そのため、成形工程での螺旋状の巻回時に起こりうる径寸法のばらつきを小さくすることができる。 In the groove forming step of this embodiment, the groove portion 2B is formed at the position where the notch portion 29 is formed in the comb-shaped sheet 4. Therefore, the comb-shaped sheet 4 before the molding step has a groove portion 2B at a position where the notch portion 29 is formed. The groove portion 2B is formed in the yoke portion 2. The yoke portion 2 in which the groove portion 2B is formed is less likely to be stretched during rolling in the molding process than the yoke portion 2 in which the groove portion 2B is formed. As a result, during rolling in the molding process, the elongation of the yoke portion 2 in which the notch portion 29 is formed is suppressed, and the yoke portion 2 and the notch portion 29 are not formed at the position where the notch portion 29 is formed. The elongation of the yoke portion 2 at the position is substantially made uniform. Therefore, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process.
（変形例７）
　本例は、実施形態５におけるシート形成工程と溝形成工程との順序を入れ替えた例である。つまり、溝形成工程後にシート形成工程を行う。 (Modification 7)
This example is an example in which the order of the sheet forming step and the groove forming step in the fifth embodiment is changed. That is, the sheet forming step is performed after the groove forming step.
　まず、溝形成工程では、図４１に示すように、板材４０において切欠き部２９が形成される位置に対応する箇所２９Ｐでの、ヨーク部２に対応する箇所２Ｐに、溝部２Ｂを形成する。具体的には、板材４０におけるヨーク部２に対応する箇所２Ｐであって、ヨーク部２の切欠き部２９の形成予定位置２９Ｐに溝部２Ｂを形成する。溝部２Ｂは、ティース部延長領域２３に対応する箇所２３Ｐに形成しても、ティース部非延長領域２４に対応する箇所２４Ｐに形成してもよく、ティース部延長領域２３に対応する箇所２３Ｐ及びティース部非延長領域２４に対応する箇所２４Ｐをまたぐように形成してもよい。溝形成工程では、実施形態２、変形例２と同様にプレス機６４、予備成形機６２により溝部２Ｂを形成することができる。 First, in the groove forming step, as shown in FIG. 41, the groove portion 2B is formed at the portion 29P corresponding to the position where the notch portion 29 is formed in the plate material 40, and at the portion 2P corresponding to the yoke portion 2. Specifically, the groove portion 2B is formed at the portion 2P of the plate material 40 corresponding to the yoke portion 2 and at the planned formation position 29P of the notch portion 29 of the yoke portion 2. The groove portion 2B may be formed at a portion 23P corresponding to the teeth portion extension region 23, or may be formed at a portion 24P corresponding to the teeth portion non-extension region 24, and the groove portion 2B may be formed at the portion 23P corresponding to the teeth portion extension region 23 and the teeth. It may be formed so as to straddle the portion 24P corresponding to the portion non-extension region 24. In the groove forming step, the groove portion 2B can be formed by the press machine 64 and the preforming machine 62 as in the second embodiment and the second modification.
　次いで、図４１に示すように、ティース部３と、ヨーク部２と、切欠き部２９を有する櫛状シート４を打ち抜く。その後、成形工程を行うことにより、実施形態５と同様の回転機コア１を製造することができる。 Next, as shown in FIG. 41, the comb-shaped sheet 4 having the tooth portion 3, the yoke portion 2, and the notch portion 29 is punched out. After that, by performing the molding step, the rotary machine core 1 similar to that of the fifth embodiment can be manufactured.
（実施形態６）
　ヨーク部２における切欠き部２９が形成された位置に薄肉部２Ｃを形成する形態について説明する。本形態では、実施形態３と同様に回転機コア１に切欠き部２９を形成する。そして、図４２に示すように、ヨーク部２における切欠き部２９が形成された位置に薄肉部２Ｃを有する回転機コア１を製造する。以下に本形態を詳説する。 (Embodiment 6)
A form in which the thin-walled portion 2C is formed at the position where the notch portion 29 is formed in the yoke portion 2 will be described. In the present embodiment, the notch portion 29 is formed in the rotary machine core 1 as in the third embodiment. Then, as shown in FIG. 42, the rotary machine core 1 having the thin-walled portion 2C at the position where the notch portion 29 is formed in the yoke portion 2 is manufactured. This form will be described in detail below.
　本形態の回転機コア１は、シート形成工程と、薄肉化工程と、成形工程を行い、次の手順で製造される。薄肉部２Ｃは、シート形成後の櫛状シート４に対して形成してもよいし、シート形成工程前の板材４０に対して形成してもよい。つまり、成形工程前に薄肉部２Ｃが形成されていればよい。本形態では、櫛状シート４に対して薄肉部２Ｃを形成する場合について説明する。 The rotary machine core 1 of this embodiment is manufactured by the following procedure after performing a sheet forming step, a thinning step, and a molding step. The thin portion 2C may be formed on the comb-shaped sheet 4 after the sheet is formed, or may be formed on the plate material 40 before the sheet forming step. That is, it is sufficient that the thin portion 2C is formed before the molding step. In this embodiment, a case where the thin portion 2C is formed on the comb-shaped sheet 4 will be described.
　図４３に示すように、シート形成工程では、実施形態３と同様に、板材４０からヨーク部２とティース部３と切欠き部２９を有する櫛状シート４を打ち抜く。切欠き部２９については、実施形態５と同様である。 As shown in FIG. 43, in the sheet forming step, the comb-shaped sheet 4 having the yoke portion 2, the teeth portion 3 and the notch portion 29 is punched out from the plate material 40 as in the third embodiment. The notch portion 29 is the same as in the fifth embodiment.
　図４３、図４４（ａ）～（ｃ）に示すように、薄肉化工程では、櫛状シート４のヨーク部２における切欠き部２９の形成位置に薄肉部２Ｃを形成する。複数の切欠き部２９がある場合には、全ての切欠き部２９の形成位置に薄肉部２Ｃを形成してもよいし、切欠き部２９の形成位置のうちの一部に薄肉部２Ｃを形成してもよい。ヨーク部２の延び方向Ｌにおける薄肉部２Ｃの長さＤ3は、適宜調整可能であるが、例えば、ヨーク部２の延び方向Ｌにおける切欠き部２９の長さＣ1と同程度にすることができる。薄肉部２Ｃは、ティース部非延長領域２４に形成しても、ティース部延長領域２３に形成しても、これらの領域２３、２４をまたがって形成してもよい。薄肉部２Ｃのその他寸法については、実施形態４と同様である。 As shown in FIGS. 43 and 44 (a) to 44 (c), in the thinning step, the thinned portion 2C is formed at the position where the cutout portion 29 is formed in the yoke portion 2 of the comb-shaped sheet 4. When there are a plurality of notch portions 29, the thin-walled portion 2C may be formed at all the notch portions 29 forming positions, or the thin-walled portion 2C may be formed at a part of the forming positions of the notch portions 29. It may be formed. The length D 3 of the thin wall portion 2C in the extension direction L of the yoke portion 2 can be adjusted as appropriate, but for example, it should be about the same as the length C 1 of the notch portion 29 in the extension direction L of the yoke portion 2. Can be done. The thin-walled portion 2C may be formed in the teeth portion non-extension region 24, in the teeth portion extension region 23, or may be formed across these regions 23 and 24. The other dimensions of the thin portion 2C are the same as those in the fourth embodiment.
　薄肉化工程では、実施形態４のように、プレス機６４にて薄肉部２Ｃを形成することができる。構成の図示を省略するが、プレス機６４の薄肉部形成用凸部６４４ｇの間隔を変更することにより、切欠き部２９の形成位置に薄肉部２Ｃを形成することができる。また、変形例５に示すように、予備成形機６２のローラ６２１、６２２により薄肉部２Ｃを形成することもできる。構成の図示を省略するが、ローラ６２１の薄肉部形成用の凸部６２１ｄの間隔を変更することにより、切欠き部２９の形成位置に薄肉部２Ｃを形成することができる。 In the thinning step, the thinned portion 2C can be formed by the press machine 64 as in the fourth embodiment. Although the configuration is not shown, the thin-walled portion 2C can be formed at the notch 29 forming position by changing the interval of the thin-walled portion forming convex portion 644 g of the press machine 64. Further, as shown in the modified example 5, the thin portion 2C can be formed by the rollers 621 and 622 of the preforming machine 62. Although not shown in the configuration, the thin-walled portion 2C can be formed at the notched portion 29 formation position by changing the interval of the convex portion 621d for forming the thin-walled portion of the roller 621.
　薄肉化工程後、実施形態１のように成形工程を行って櫛状シート４を巻回させることにより、回転機コア１を製造することができる。 After the thinning step, the rotary machine core 1 can be manufactured by performing a molding step as in the first embodiment and winding the comb-shaped sheet 4.
　本形態の薄肉化工程では、櫛状シート４における切欠き部２９が形成された位置に薄肉部２Ｃを形成する。そのため、成形工程前の櫛状シート４は、切欠き部２９が形成された位置に薄肉部２Ｃを有する。薄肉部２Ｃは、ヨーク部２に形成されている。薄肉部２Ｃが形成されたヨーク部２は、薄肉部２Ｃが形成されていないヨーク部２に比べて、圧延により伸ばされる材料が少ないため、成形工程での圧延により伸びにくくなる。その結果、成形工程の圧延時に、切欠き部２９が形成されたヨーク部２の伸びが抑制され、切欠き部２９が形成されたヨーク部２と切欠き部２９が形成されていないヨーク部２の伸びが略均一化される。そのため、成形工程での螺旋状の巻回時に起こりうる径寸法のばらつきを小さくすることができる。 In the thinning step of this embodiment, the thinning portion 2C is formed at the position where the notch portion 29 is formed in the comb-shaped sheet 4. Therefore, the comb-shaped sheet 4 before the molding step has a thin-walled portion 2C at a position where the notch portion 29 is formed. The thin-walled portion 2C is formed in the yoke portion 2. Since the yoke portion 2 in which the thin-walled portion 2C is formed has less material to be stretched by rolling than the yoke portion 2 in which the thin-walled portion 2C is not formed, the yoke portion 2 is less likely to be stretched by rolling in the forming step. As a result, during rolling in the molding process, the elongation of the yoke portion 2 in which the notch portion 29 is formed is suppressed, and the yoke portion 2 in which the notch portion 29 is formed and the yoke portion 2 in which the notch portion 29 is not formed are suppressed. Elongation is almost uniform. Therefore, it is possible to reduce the variation in diameter and dimension that may occur during spiral winding in the molding process.
（変形例８）
　本例は、実施形態６におけるシート形成工程と薄肉化工程との順序を入れ替えた例である。つまり、薄肉化工程後にシート形成工程を行う。 (Modification 8)
This example is an example in which the order of the sheet forming step and the thinning step in the sixth embodiment is changed. That is, the sheet forming step is performed after the thinning step.
　まず、薄肉化工程では、図４５に示すように、板材４０において切欠き部２９が形成される位置に対応する箇所２９Ｐでの、ヨーク部２に対応する箇所２Ｐに、薄肉部２Ｃを形成する。具体的には、板材４０におけるヨーク部２に対応する箇所２Ｐであって、ヨーク部２の切欠き部２９の形成予定位置２９Ｐに薄肉部２Ｃを形成する。薄肉部２Ｃは、ティース部延長領域２３に対応すする箇所２３Ｐに形成しても、ティース部非延長領域２４に対応する箇所２４Ｐに形成してもよく、ティース部延長領域２３に対応する箇所２３Ｐ及びティース部非延長領域２４に対応する箇所２４Ｐをまたぐように形成してもよい。薄肉化工程では、実施形態４、変形例５と同様にプレス機６４、予備成形機６２により薄肉部２Ｃを形成することができる。 First, in the thinning step, as shown in FIG. 45, the thinning portion 2C is formed at the portion 29P corresponding to the position where the notch portion 29 is formed in the plate material 40, and at the portion 2P corresponding to the yoke portion 2. .. Specifically, the thin portion 2C is formed at the portion 2P of the plate material 40 corresponding to the yoke portion 2 and at the planned formation position 29P of the notch portion 29 of the yoke portion 2. The thin-walled portion 2C may be formed at a portion 23P corresponding to the teeth portion extension region 23, or may be formed at a portion 24P corresponding to the teeth portion non-extension region 24, and may be formed at a portion 23P corresponding to the teeth portion extension region 23. And it may be formed so as to straddle the portion 24P corresponding to the tooth portion non-extension region 24. In the thinning step, the thinned portion 2C can be formed by the press machine 64 and the preforming machine 62 as in the fourth embodiment and the fifth modification.
　次いで、図４５に示すように、ティース部３とヨーク部２と切欠き部２９とを有する櫛状シート４を打ち抜く。その後、成形工程を行うことにより、実施形態６と同様の回転機コア１を製造することができる。 Next, as shown in FIG. 45, the comb-shaped sheet 4 having the tooth portion 3, the yoke portion 2, and the notch portion 29 is punched out. After that, by performing the molding step, the rotary machine core 1 similar to that of the sixth embodiment can be manufactured.
　本開示は上記各実施形態、変形例に限定されるものではなく、その要旨を逸脱しない範囲において種々の実施形態に適用することが可能である。例えば、実施形態、変形例では、ティース部３を内側にして巻回された形態、例について説明したが、ティース部３を外側にして巻回させることができる。回転機コア１は、ステータコア、ロータコアなどに用いることができる。 The present disclosure is not limited to each of the above embodiments and modifications, and can be applied to various embodiments without departing from the gist thereof. For example, in the embodiment and the modified example, the form and the example in which the teeth portion 3 is wound on the inside have been described, but the teeth portion 3 can be wound on the outside. The rotary machine core 1 can be used for a stator core, a rotor core, and the like.
　本開示は、実施形態に準拠して記述されたが、本開示は当該実施形態や構造に限定されるものではないと理解される。本開示は、様々な変形例や均等範囲内の変形をも包含する。加えて、様々な組み合わせや形態、さらには、それらに一要素のみ、それ以上、あるいはそれ以下、を含む他の組み合わせや形態をも、本開示の範疇や思想範囲に入るものである。 Although this disclosure has been described in accordance with an embodiment, it is understood that this disclosure is not limited to that embodiment or structure. The present disclosure also includes various modifications and modifications within an equal range. In addition, various combinations and forms, as well as other combinations and forms that include only one element, more, or less, are also within the scope of the present disclosure.

Claims (6)

  1. 　帯状に延びるヨーク部（２）と、該ヨーク部の幅方向（Ｗ）の第１端（２１）から延びる複数のティース部（３）とを有すると共に、上記ヨーク部内に、該ヨーク部から延びる上記ティース部が形成されたティース部延長領域（２３）と、上記ティース部が形成されていないティース部非延長領域（２４）とを有する櫛状シート（４）を、板材（４０）から打ち抜くシート形成工程と、
    　上記櫛状シートの上記ヨーク部を圧延することにより、上記ヨーク部を上記幅方向に湾曲させて螺旋状に巻回しつつ積層する成形工程と、を有し、
    　上記櫛状シートにおける上記ヨーク部の上記ティース部延長領域において、上記ヨーク部を上記幅方向に２分する中央線（Ｃ）と上記成形工程での巻回により内周側（Ｉ）となる上記ヨーク部の上記幅方向の端部（２６）との間に、周囲よりも板材が板厚方向に張り出した張出部（２Ａ）を形成するか、あるいは、上記板材における上記ヨーク部の上記ティース部延長領域に対応する箇所（２３Ｐ）において、上記ヨーク部に対応する箇所（２Ｐ）を上記幅方向に２分する中央線（ＣＰ）と上記成形工程での巻回により内周側（Ｉ）となる上記ヨーク部の上記幅方向の端部に対応する箇所（２６Ｐ）との間に、周囲よりも板材が板厚方向に張り出した張出部（２Ａ）を形成する張出成形工程を上記成形工程より前に行う、回転機コア（１）の製造方法。     It has a yoke portion (2) extending in a band shape and a plurality of teeth portions (3) extending from the first end (21) in the width direction (W) of the yoke portion, and extends from the yoke portion in the yoke portion. A sheet for punching a comb-shaped sheet (4) having a teeth portion extension region (23) in which the teeth portion is formed and a teeth portion non-extension region (24) in which the teeth portion is not formed from a plate material (40). The formation process and
    By rolling the yoke portion of the comb-shaped sheet, the yoke portion is curved in the width direction and laminated while being spirally wound.
    In the tooth portion extension region of the yoke portion of the comb-shaped sheet, the center line (C) that divides the yoke portion into two in the width direction and the inner peripheral side (I) due to winding in the molding step. An overhanging portion (2A) is formed between the yoke portion and the end portion (26) in the width direction, or the plate material overhangs in the plate thickness direction from the periphery, or the teeth of the yoke portion in the plate material. At the portion (23P) corresponding to the portion extension region, the central line (CP) that divides the portion (2P) corresponding to the yoke portion into two in the width direction and the inner peripheral side (I) by winding in the molding step. The overhang molding step of forming an overhang portion (2A) in which the plate material overhangs in the plate thickness direction from the periphery is formed between the yoke portion and the portion (26P) corresponding to the end portion in the width direction. A method for manufacturing a rotary machine core (1), which is performed before the molding process.
  2. 　帯状に延びるヨーク部（２）と、該ヨーク部の幅方向（Ｗ）の第１端（２１）から延びる複数のティース部（３）とを有すると共に、上記ヨーク部内に、該ヨーク部から延びる上記ティース部が形成されたティース部延長領域（２３）と、上記ティース部が形成されていないティース部非延長領域（２４）とを有する櫛状シート（４）を、板材（４０）から打ち抜くシート形成工程と、
    　上記櫛状シートの上記ヨーク部を圧延することにより、上記ヨーク部を上記幅方向に湾曲させて螺旋状に巻回しつつ積層する成形工程と、を有し、
    　上記櫛状シートにおける上記ヨーク部の上記ティース部非延長領域に、上記ヨーク部の延び方向に沿って延びる少なくとも１つの溝部（２Ｂ）を形成するか、あるいは、上記板材における上記ヨーク部の上記ティース部非延長領域に対応する箇所（２４Ｐ）に、上記ヨーク部に対応する箇所（２Ｐ）の延び方向に沿って延びる少なくとも１つの溝部（２Ｂ）を形成する溝形成工程を上記成形工程より前に行う、回転機コア（１）の製造方法。     It has a yoke portion (2) extending in a band shape and a plurality of teeth portions (3) extending from the first end (21) in the width direction (W) of the yoke portion, and extends from the yoke portion in the yoke portion. A sheet for punching a comb-shaped sheet (4) having a teeth portion extension region (23) in which the teeth portion is formed and a teeth portion non-extension region (24) in which the teeth portion is not formed from a plate material (40). The formation process and
    By rolling the yoke portion of the comb-shaped sheet, the yoke portion is curved in the width direction and laminated while being spirally wound.
    At least one groove (2B) extending along the extending direction of the yoke portion is formed in the teeth portion non-extension region of the yoke portion in the comb-shaped sheet, or the teeth of the yoke portion in the plate material are formed. Prior to the molding step, a groove forming step of forming at least one groove portion (2B) extending along the extending direction of the portion (2P) corresponding to the yoke portion is performed at the portion (24P) corresponding to the portion non-extension region. The method for manufacturing the rotary machine core (1).
  3. 　上記シート形成工程では、上記ヨーク部の上記ティース部非延長領域における、上記成形工程での巻回により外周側（Ｏ）となる上記ヨーク部の上記幅方向の端部（２５）に、切欠き部（２９）を有する上記櫛状シートを打ち抜き、
    　上記溝形成工程では、上記櫛状シートにおける上記切欠き部が形成された上記ティース部非延長領域に、上記切欠き部が形成されていない上記ティース部非延長領域よりも多くの上記溝部を形成するか、あるいは、上記板材における上記切欠き部が形成される上記ティース部非延長領域に対応する箇所（２４１Ｐ）に、上記切欠き部が形成されない上記ティース部非延長領域に対応する箇所（２４２Ｐ）よりも多くの上記溝部を形成する、請求項２に記載の回転機コアの製造方法。     In the sheet forming step, there is a notch in the widthwise end portion (25) of the yoke portion that becomes the outer peripheral side (O) due to the winding in the molding step in the teeth portion non-extension region of the yoke portion. The comb-shaped sheet having the portion (29) is punched out.
    In the groove forming step, more grooves are formed in the teeth portion non-extension region in which the notch portion is formed in the comb-shaped sheet than in the teeth portion non-extension region in which the notch portion is not formed. Or, in the portion (241P) corresponding to the teeth portion non-extension region where the notch portion is formed in the plate material, the portion corresponding to the teeth portion non-extension region where the notch portion is not formed (242P). The method for manufacturing a rotary machine core according to claim 2, wherein more grooves are formed than the above.
  4. 　帯状に延びるヨーク部（２）と、該ヨーク部の幅方向（Ｗ）の第１端（２１）から延びる複数のティース部（３）とを有すると共に、上記ヨーク部内に、該ヨーク部から延びる上記ティース部が形成されたティース部延長領域（２３）と、上記ティース部が形成されていないティース部非延長領域（２４）とを有する櫛状シート（４）を、板材（４０）から打ち抜くシート形成工程と、
    　上記櫛状シートの上記ヨーク部を圧延することにより、上記ヨーク部を上記幅方向に湾曲させて螺旋状に巻回しつつ積層する成形工程と、を有し、
    　上記櫛状シートにおける上記ヨーク部の上記ティース部非延長領域に、上記ティース部延長領域よりも厚みの小さい薄肉部（２Ｃ）を形成するか、あるいは、上記板材における上記ヨーク部の上記ティース部非延長領域に対応する箇所（２４Ｐ）に、上記ティース部延長領域に対応する箇所よりも厚みの小さい薄肉部（２Ｃ）を形成する薄肉化工程を上記成形工程より前に行う、回転機コア（１）の製造方法。     It has a yoke portion (2) extending in a band shape and a plurality of teeth portions (3) extending from the first end (21) in the width direction (W) of the yoke portion, and extends from the yoke portion in the yoke portion. A sheet for punching a comb-shaped sheet (4) having a teeth portion extension region (23) in which the teeth portion is formed and a teeth portion non-extension region (24) in which the teeth portion is not formed from a plate material (40). The formation process and
    By rolling the yoke portion of the comb-shaped sheet, the yoke portion is curved in the width direction and laminated while being spirally wound.
    A thin portion (2C) having a thickness smaller than that of the teeth portion extension region is formed in the teeth portion non-extension region of the yoke portion in the comb-shaped sheet, or the teeth portion non-extension of the yoke portion in the plate material is formed. The rotary machine core (1) is subjected to a thinning step of forming a thin-walled portion (2C) having a thickness smaller than that of the portion corresponding to the tooth portion extension region at the portion (24P) corresponding to the extension region before the molding step. ) Manufacturing method.
  5. 　帯状に延びるヨーク部（２）と、該ヨーク部の幅方向（Ｗ）の第１端（２１）から延びる複数のティース部（３）と、下記成形工程での巻回により外周側（Ｏ）となる上記ヨーク部の上記幅方向の端部（２５）に形成された切欠き部（２９）とを有する櫛状シート（４）を、板材（４０）から打ち抜くシート形成工程と、
    　上記櫛状シートの上記ヨーク部を圧延することにより、上記ヨーク部を上記幅方向に湾曲させて螺旋状に巻回しつつ積層する成形工程と、を有し、
    　上記櫛状シートの上記切欠き部が形成された位置における上記ヨーク部に、該ヨーク部の延び方向（Ｌ）に沿って延びる少なくとも１つの溝部（２Ｂ）を形成するか、あるいは、上記板材において上記切欠き部が形成される位置に対応する箇所（２９Ｐ）における上記ヨーク部に対応する箇所（２Ｐ）に、該ヨーク部に対応する箇所の延び方向（Ｌ）に沿って延びる少なくとも１つの溝部（２Ｂ）を形成する溝形成工程を上記成形工程より前に行う、回転機コア（１）の製造方法。     A band-shaped yoke portion (2), a plurality of tooth portions (3) extending from the first end (21) in the width direction (W) of the yoke portion, and an outer peripheral side (O) by winding in the following molding process. A sheet forming step of punching a comb-shaped sheet (4) having a notch portion (29) formed at an end portion (25) of the yoke portion in the width direction from a plate material (40).
    By rolling the yoke portion of the comb-shaped sheet, the yoke portion is curved in the width direction and laminated while being spirally wound.
    At least one groove (2B) extending along the extending direction (L) of the yoke portion is formed in the yoke portion at the position where the notch portion of the comb-shaped sheet is formed, or in the plate material. At least one groove extending along the extension direction (L) of the portion corresponding to the yoke portion at the portion (2P) corresponding to the yoke portion at the portion (29P) corresponding to the position where the notch portion is formed. A method for manufacturing a rotary machine core (1), wherein the groove forming step for forming (2B) is performed before the molding step.
  6. 　帯状に延びるヨーク部（２）と、該ヨーク部の幅方向（Ｗ）の第１端（２１）から延びる複数のティース部（３）と、下記成形工程での巻回により外周側（Ｏ）となる上記ヨーク部の上記幅方向の端部（２５）に形成された切欠き部（２９）とを有する櫛状シート（４）を、板材（４０）から打ち抜くシート形成工程と、
    　上記櫛状シートの上記ヨーク部を圧延することにより、上記ヨーク部を上記幅方向に湾曲させて螺旋状に巻回しつつ積層する成形工程と、を有し、
    　上記櫛状シートの上記切欠き部が形成された位置における上記ヨーク部に、周囲よりも厚みの小さい薄肉部（２Ｃ）を形成するか、あるいは、上記板材において上記切欠き部が形成される位置に対応する箇所（２９Ｐ）における上記ヨーク部に対応する箇所（２Ｐ）に、周囲よりも厚みの小さい薄肉部（２Ｃ）を形成する薄肉化工程を上記成形工程より前に行う、回転機コア（１）の製造方法。     A band-shaped yoke portion (2), a plurality of tooth portions (3) extending from the first end (21) in the width direction (W) of the yoke portion, and an outer peripheral side (O) by winding in the following molding process. A sheet forming step of punching a comb-shaped sheet (4) having a notch portion (29) formed at an end portion (25) of the yoke portion in the width direction from a plate material (40).
    By rolling the yoke portion of the comb-shaped sheet, the yoke portion is curved in the width direction and laminated while being spirally wound.
    A thin-walled portion (2C) having a thickness smaller than the periphery is formed in the yoke portion at the position where the notch portion of the comb-shaped sheet is formed, or a position where the notch portion is formed in the plate material. A rotary machine core (2P) in which a thinning step of forming a thin portion (2C) having a thickness smaller than that of the periphery is performed before the molding step at the portion (2P) corresponding to the yoke portion in the portion (29P) corresponding to the above. 1) Manufacturing method.
PCT/JP2020/041276 2019-11-08 2020-11-05 Method for manufacturing dynamo-electrical machine core WO2021090854A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5775551A (en) * 1980-10-24 1982-05-12 Nippon Denso Co Ltd Iron core for rotary electric machine
JP2001186697A (en) * 1999-12-27 2001-07-06 Mitsubishi Electric Corp Stator of rotary electric machine
JP2009089482A (en) * 2007-09-28 2009-04-23 Denso Corp Stator core of rotating electric machine and its manufacturing method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5775551A (en) * 1980-10-24 1982-05-12 Nippon Denso Co Ltd Iron core for rotary electric machine
JP2001186697A (en) * 1999-12-27 2001-07-06 Mitsubishi Electric Corp Stator of rotary electric machine
JP2009089482A (en) * 2007-09-28 2009-04-23 Denso Corp Stator core of rotating electric machine and its manufacturing method

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