Method for manufacturing laminated iron core and laminated iron core

Abstract

The manufacturing method of a laminated iron core comprises: a punching step, in which a plate-shaped iron core forming component having a strip-shaped back yoke forming portion extending in one direction and a plurality of teeth portions is formed by punching a steel plate; a first coating step, in which an adhesive is applied to a first coating portion located on a surface in a thickness direction of the iron core forming component extending in the one direction formed by the punching step; a bending step, in which an end portion on the other side in the width direction of the back yoke forming portion coated with the adhesive by the first coating portion is pressed toward one side in the width direction, and the iron core forming component is bent into an arc shape when viewed from the thickness direction; a second coating step, in which an adhesive is applied to a second coating portion located at a position closer to the end portion on the other side in the width direction of the back yoke forming portion than the first coating portion of the iron core forming component where the back yoke forming portion is bent into an arc shape by the bending step; and a bonding and laminating step, in which the iron core forming component is wound into a spiral shape, and stacked and bonded in the thickness direction.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a laminated iron core and the laminated iron core. Background Art

[0002] A method for manufacturing a laminated core is known in which a strip-shaped steel plate extending in one direction is bent into an arc shape to form a back yoke portion extending in a spiral shape. As a laminated core manufactured by such a manufacturing method, for example, the following stator core is disclosed: a punched plate having a plurality of teeth protruding from one long side of a strip-shaped back yoke is bent into an arc shape, a plurality of the arc-shaped punched plates are combined to form an annular linear core, and the outer periphery of the linear core is fixed by laser welding (for example, Patent Document 1).

[0003] In addition, a method for manufacturing a laminated iron core is known in which a plurality of iron core sheets adjacent to each other in a stacking direction are bonded to each other using an adhesive. As a laminated iron core manufactured by such a manufacturing method, for example, a laminated iron core is disclosed, which comprises: a bonding portion provided between electromagnetic steel sheets adjacent to each other in the stacking direction, respectively bonding the electromagnetic steel sheets to each other; and a welding portion, respectively welding the electromagnetic steel sheets to each other, wherein the electromagnetic steel sheets are bonded to each other only by the bonding portion and the welding portion (for example, Patent Document 2). [Prior art literature] [Patent Document]

[0004] Patent Document 1: Japanese Patent Application Publication No. 2005-143164 Patent Document 2: Japanese Patent Application Publication No. 2023-60136 Summary of the invention

[0005] However, when the strip-shaped back yoke extending in one direction is bent into an arc shape to form a spiral shape, the back yoke may rebound to return to the state before bending. Therefore, when the back yoke is fixed in the stacking direction by laser welding as in the above-mentioned Patent Document 1, the shape of the laminated core needs to be maintained during the laser welding operation.

[0006] In this regard, it is considered to maintain the shape of the laminated core by fixing the spiral back yoke part with an adhesive in a stacked state in the thickness direction. However, as mentioned above, since the back yoke part rebounds, when the back yoke part is fixed with the adhesive, the back yoke part moves, and it may not be possible to fix the back yoke part with high precision and reliability.

[0007] Therefore, there is a demand for a manufacturing method capable of fixing core sheet forming components including a spiral back yoke portion and a plurality of teeth portions with higher accuracy and reliability in a state where the core sheets are stacked in the thickness direction.

[0008] An object of the present invention is to provide a manufacturing method in which, in a laminated iron core in which iron core sheet forming components are stacked in a thickness direction, the iron core sheet forming components can be fixed with higher precision and more reliably in a stacked state along the thickness direction, wherein the iron core sheet forming components include a back yoke portion extending spirally around an axis and a plurality of tooth portions.

[0009] A method for manufacturing a laminated iron core according to one embodiment of the present invention is a method for manufacturing a cylindrical laminated iron core in which a plate-shaped back yoke portion extending spirally with an axis as the center and a plurality of plate-shaped teeth extending radially inward from the back yoke portion are stacked in the thickness direction and extend along the axis. The method for manufacturing a laminated iron core comprises: a punching step, in which a plate-shaped iron core forming component is formed by punching a steel plate, wherein the iron core forming component has a band-shaped back yoke forming portion extending in one direction and a plurality of teeth protruding in the width direction from an end portion on one side in the width direction of the back yoke forming portion; a first coating step, in which an adhesive is applied to a first coating portion located on at least one of the surfaces of one side in the thickness direction and the other side in the thickness direction of the iron core forming component formed by the punching step; and a bending step, in which the first coating portion is coated with the adhesive in the width direction of the back yoke forming portion of the iron core forming component. The end portion on the other side is pressed toward one side in the width direction to bend the iron core sheet forming component into an arc shape when viewed along the thickness direction; a second coating process, applying adhesive to a second coating portion on a surface of at least one of the one side in the thickness direction and the other side in the thickness direction of the iron core sheet forming component bent into an arc shape by the bending process and located closer to the end portion on the other side in the width direction of the back yoke forming portion than the first coating portion; and a bonding and laminating process, winding the iron core sheet forming component coated with adhesive on the first coating portion and the second coating portion respectively into a spiral shape, stacking and bonding in the thickness direction.

[0010] A laminated iron core according to one embodiment of the present invention is a cylindrical laminated iron core in which iron core sheets are laminated in the thickness direction and extend along the axis, and the iron core sheet has a plate-shaped back yoke portion extending spirally with the axis as the center and a plurality of plate-shaped teeth extending radially inward from the back yoke portion. The laminated iron core has a plurality of bonded portions, and the plurality of bonded portions bond the iron core sheets in the thickness direction by an adhesive in a state where the iron core sheets are laminated in the thickness direction. The plurality of bonded portions include a first bonded portion and a second bonded portion that is closer to the outer peripheral side of the laminated iron core than the first bonded portion.

[0011] According to the present invention, there can be provided a manufacturing method in which, in a laminated iron core in which iron core sheet forming components are stacked in a thickness direction, the iron core sheet forming components can be fixed with higher precision and more reliably in a stacked state in the thickness direction, wherein the iron core sheet forming components include a back yoke portion extending spirally around an axis line and a plurality of tooth portions. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a perspective view showing a schematic structure of a laminated core according to the first embodiment. Figure 2 It is an exploded view of the laminated core. Figure 3 yes Figure 2 The partially enlarged view is a diagram illustrating the position of the bonded portion. Figure 4 It is a cross-sectional view of a laminated core and is a diagram for explaining a bonded portion. Figure 5 This is a flowchart showing the method for manufacturing the laminated iron core according to the first embodiment. Figure 6 This is a blanking diagram of a steel plate. Figure 7 It is a plan view showing a schematic structure of a core sheet forming component. Figure 8 The diagram is a diagram for explaining the relationship between the position where the adhesive is applied to the core sheet forming member in the first coating step and the second coating step and the position where the core sheet forming member is bent in the bending step. Fig. 9 This is a diagram for explaining an example of a method of pressing the end portion on the other side in the width direction of the core sheet forming member toward one side in the width direction. Fig.10 It is a diagram for explaining a situation where springback occurs in the core sheet forming member in the second coating step. DETAILED DESCRIPTION

[0013] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the same or equivalent parts in the drawings are marked with the same reference numerals, and their descriptions are not repeated. In addition, the dimensions of the components in each figure do not faithfully show the dimensions of the actual components and the dimensional ratios of the components.

[0014] In the following description, a direction parallel to the central axis P of the laminated core is referred to as an axial direction, a direction orthogonal to the central axis P is referred to as a radial direction, and a direction along an arc centered on the central axis P is referred to as a circumferential direction.

[0015] In addition, in the following description, expressions such as "fixed", "connected" and "mounted" include not only cases where components are directly fixed to each other, but also cases where components are fixed via other components. That is, in the following description, expressions such as fixed include the meaning of direct and indirect fixing of components to each other.

[0016] (Implementation Method 1) (Structure of laminated core) Reference Figures 1 to 4 , a laminated iron core 1 according to an exemplary embodiment 1 of the present invention will be described. Figure 1 As shown, the laminated core 1 is in a cylindrical shape extending along the central axis P. The laminated core 1 is respectively laminated in the thickness direction with: a plate-shaped back yoke portion 3 extending in a spiral shape with the central axis P of the laminated core 1 as the center; and a plurality of plate-shaped teeth 4 extending from the back yoke portion 3 to the radial inner side of the laminated core 1. The back yoke portion 3 has a slit 31 extending from the end surface of the inner circumference to the radial outer side between the teeth 4 adjacent in the circumferential direction.

[0017] The laminated core 1 is formed by punching out a plate-shaped electromagnetic steel sheet as a material of the laminated core 1 to form a strip-shaped core sheet forming member 82, and winding the core sheet forming member 82 into a spiral shape when viewed in the thickness direction. In the laminated core 1, the back yoke portion 3 and the tooth portion 4 are stacked on each other in the thickness direction. Hereinafter, for the sake of explanation, the portions of each layer constituting the laminated core 1 are referred to as core sheets 2. The details of the manufacturing method of the laminated core 1 will be described later.

[0018] Figure 2 is an exploded view of the laminated core 1. Figure 2 In FIG. 1 , a part of the core piece 2 is separated and shown.

[0019] like Figure 1 and Figure 2 As shown, the core sheet 2 has a first surface 21 which is a surface on one side in the thickness direction and a second surface 22 which is a surface on the other side in the thickness direction.

[0020] Figure 3 yes Figure 2 A partial enlarged view of Figure 2 and Figure 3 As shown, the core sheet 2 has a plurality of bonded portions 26 on the first surface 21 adjacent to the second surface 22 in the stacking direction in the laminated core 1. The core sheet 2 also has a plurality of bonded portions 26 on the second surface 22 adjacent to the first surface 21 in the stacking direction in the laminated core 1. Figure 2 and Figure 3 In the figure, the plurality of adhered portions on the second surface 22 are omitted. When the core sheet 2 is viewed in the thickness direction, the plurality of adhered portions 26 on the first surface 21 overlap with the plurality of adhered portions on the second surface 22.

[0021] like Figure 4 As shown, the portions of the core sheets 2 adjacent to each other in the stacking direction in the laminated core 1 are bonded at the bonded portion 26 by the adhesive 7. Specifically, the bonded portion 26 of the core sheet 2 on the first surface 21 is bonded to the bonded portion 26b of the second surface 22b adjacent to the first surface 21 in the stacking direction by the adhesive 7. In addition, the bonded portion 26 of the core sheet 2 on the second surface 22 is bonded to the bonded portion 26a of the first surface 21a adjacent to the second surface 22 in the stacking direction by the adhesive 7. In addition, in the actual laminated core 1, there is no partial contact between the core sheets 2 by the adhesive 7 in the stacking direction, but Figure 4 In the figure, for the sake of explanation, the above parts are shown separately.

[0022] The adhesive 7 is an adhesive capable of bonding metals to each other. The adhesive 7 is, for example, an anaerobic adhesive.

[0023] like Figure 3 As shown, the plurality of bonded portions 26 include a first bonded portion 261 and a second bonded portion 262 located closer to the outer periphery of the laminated core 1 than the first bonded portion 261. In this embodiment, the first bonded portion 261 is located at the teeth portion 4, and the second bonded portion 262 is located at the back yoke portion 3.

[0024] (Method for manufacturing laminated core) use Figures 5 to 10 An exemplary method of manufacturing the laminated core 1 having the above-described structure will be described in detail.

[0025] Figure 5 1 is a flowchart showing an example of a method for manufacturing the laminated iron core 1. Figure 5 As shown, the method for manufacturing the laminated core 1 includes a preparation step S1 , a punching step S2 , a first coating step S3 , a bending step S4 , a second coating step S5 , and an adhesive lamination step S6 .

[0026] In the preparation step S1, an electromagnetic steel sheet as a magnetic material is prepared. In the present embodiment, the electromagnetic steel sheet is in the form of a strip that is long in one direction. In addition, the electromagnetic steel sheet is hereinafter referred to as a steel sheet 80.

[0027] In the punching step S2 , the steel plate 80 is punched out to form a strip-shaped core sheet forming member 82 .

[0028] Figure 6 FIG. 8 is an example of a punching diagram of a core sheet forming component 82 in a steel plate 80. Figure 6 In the figure, for the sake of convenience, the area of ​​the steel plate 80 to be punched is marked with oblique lines. The punching step S2 is performed by punching. That is, in the punching step S2, a punch is used to punch. Figure 6The area with diagonal lines in the middle. Detailed description of the punching process is omitted.

[0029] In the punching step S2 , the above-mentioned region of the steel plate 80 is punched out to form a core sheet forming member 82 having a back yoke forming portion 83 , a plurality of teeth 4 , and a slit 84 .

[0030] Figure 7 1 is a diagram showing a schematic structure of a surface on one side in the thickness direction of the core sheet forming component 82. Figure 7 As shown, the back yoke forming portion 83 has a strip-like shape extending in the length direction of the steel plate 80. A plurality of teeth 4 extend from an end portion on one side in the width direction of the back yoke forming portion 83 to one side in the width direction. A slit 84 is formed between adjacent teeth 4 in the back yoke forming portion 83. The slit 84 extends from an end portion on one side in the width direction of the back yoke forming portion 83 to the other side in the width direction. Hereinafter, for the sake of explanation, the end portion on one side in the width direction of the back yoke forming portion 83 is referred to as the inner end portion of the back yoke forming portion 83, and the end portion on the other side in the width direction of the back yoke forming portion 83 is referred to as the outer end portion of the back yoke forming portion 83. The back yoke forming portion 83 constitutes the back yoke portion 3 of the laminated core 1 by stacking in the thickness direction. The outer end portion of the back yoke forming portion 83 constitutes the outer peripheral surface of the back yoke portion 3 of the laminated core 1 by stacking in the thickness direction.

[0031] exist Figure 7 , reference numeral 85 indicates a first coating portion to which the adhesive 7 is applied by a first coating step S3. Reference numeral 86 indicates a second coating portion to which the adhesive 7 is applied by a second coating step S5. In the present embodiment, the area of ​​the second coating portion 86 is larger than the area of ​​the first coating portion 85. In the present embodiment, the first coating portion 85 is located on a surface on one side in the thickness direction of the tooth portion 4. The second coating portion 86 is located on a surface on one side in the thickness direction of the back yoke forming portion 83.

[0032] In the first coating step S3, the adhesive 7 is applied to the first coating portion 85 located on one side of the thickness direction of the core sheet forming member 82 extending in the one direction formed in the punching step S2. Figure 8 As shown, the adhesive 7 is applied to the first coating portion 85 of the core sheet forming member 82 by the first coating device T1 installed at the position P1.

[0033] In the bending process S4, the outer end of the back yoke forming portion 83 in a state where the adhesive 7 is applied to the first coating portion 85 is pushed toward one side in the width direction, and the iron core sheet forming component 82 is bent into an arc shape when viewed in the thickness direction. That is, by pushing the outer end toward the center axis P, the gap of the slit 84 formed in the back yoke forming portion 83 is crushed. As a result, the length of the inner end of the back yoke forming portion 83 is shorter than the length of the outer end. Therefore, the iron core sheet forming component 82 is formed into an arc shape when viewed in the thickness direction. By squeezing the gap of the slit 84, the slit 31 of the laminated iron core 1 is formed.

[0034] For example, in the bending step S4, Figure 8 and Fig. 9 The bending jig 9 shown presses the outer end portion of the back yoke forming portion 83 .

[0035] like Figure 8 and Fig. 9 As shown, the bending jig 9 has an arc shape extending in the circumferential direction with the central axis P as the center. The bending jig 9 has: a curved surface portion 91, which extends in the circumferential direction with the central axis P as the center; and a pair of flat portions 92, 93, which extend from the curved surface portion 91 toward the central axis P. The curved surface portion 91 and the pair of flat portions 92, 93 constitute a space S that is open on the inner circumference and extends in an arc shape. The outer circumferential side of a disc-shaped component can be accommodated in the space S. Therefore, the outer side of the back yoke forming portion 83 can be accommodated in the space S.

[0036] The distance from the central axis P to the inner circumference of the curved portion 91 is equal to the radius of the laminated core 1. Therefore, for example, the outer end of the back yoke forming portion 83 is made to be along the inner circumference of the curved portion 91, and the core sheet forming component 82 is moved in the direction of the hollow arrow relative to the bending jig 9. As a result, the front side of the moving direction of the back yoke forming portion 83 is pressed toward the central axis P. Therefore, the back yoke forming portion 83 is bent into an arc shape when viewed in the thickness direction.

[0037] like Fig. 9 As shown, a pair of planar portions 92 and 93 are respectively located on one side and the other side of the thickness direction of the core sheet forming part 82. When the core sheet forming part 82 is bent into an arc shape, the pair of planar portions 92 and 93 restrict the movement of the core sheet forming part 82 in the thickness direction. One of the pair of planar portions 92 and 93 protrudes from the curved surface portion 91 toward the inner end of the back yoke forming part 83 at a position opposite to the surface coated with the adhesive 7 in the first coating step S3. Therefore, the planar portion 92 is a protruding portion of the present invention.

[0038] In the present embodiment, the outer side of the back yoke forming portion 83 of the core sheet forming component 82 in the state where the adhesive 7 is applied on the surface of the tooth portion 4 in the first coating step S3 is accommodated in the space S. The second coating portion 86 described later, which is located on the surface of one side in the thickness direction of the back yoke forming portion 83, is accommodated in the space S. That is, the portion of the core sheet forming component 82 to which the adhesive 7 is applied is not accommodated in the space S. Therefore, even if the core sheet forming component 82 moves in the thickness direction in the space S, the adhesive 7 applied in the first coating step S3 will not contact the inner surface of the bending jig 9. Therefore, the adhesive 7 applied in the first coating step S3 will not be removed by the bending jig 9.

[0039] In the second coating step S5, the adhesive 7 is applied to the second coating portion 86 located on one side of the thickness direction of the core sheet forming member 82 bent into an arc shape in the bending step S4. Figure 8 As shown, the adhesive 7 is applied to the second coating portion 86 of the core sheet forming member 82 by the second coating equipment T2 installed at the position P2.

[0040] In the bonding and laminating step S6, the core sheet forming member 82 is wound into a spiral shape and overlapped in the thickness direction. Thus, the portions of the core sheet forming member 82 adjacent to each other in the laminating direction are bonded to each other at the first coating portion 85 and the second coating portion 86 by the adhesive 7. The portion bonded by the adhesive 7 on the surface of the core sheet forming member 82 becomes the bonded portion 26 of the laminated core 1.

[0041] Through the above steps, a cylindrical laminated core 1 is manufactured, which is formed by stacking a plate-shaped back yoke portion 3 extending spirally around the central axis P and a plurality of plate-shaped teeth 4 extending radially inward from the back yoke portion 3 in the thickness direction and extending along the central axis P.

[0042] That is, the exemplary method for manufacturing the laminated core 1 of the present embodiment includes a punching step S2 , a first coating step S3 , a bending step S4 , a second coating step S5 , and an adhesive lamination step S6 .

[0043] In the punching process S2, a plate-shaped iron core forming component 82 having a strip-shaped back yoke forming portion 83 extending in one direction and a plurality of teeth 4 protruding in the width direction from an end portion on one side in the width direction of the back yoke forming portion 83 is formed by punching a steel plate 80. In the first coating process S3, an adhesive 7 is coated on a first coating portion 85 located on a surface on one side in the thickness direction of the iron core forming component 82 formed in the punching process S2. In the bending process S4, an end portion on the other side in the width direction of the back yoke forming portion 83 of the iron core forming component 82 coated with the adhesive 7 on the first coating portion 85 is pressed toward one side in the width direction, and the iron core forming component 82 is bent into an arc shape when viewed in the thickness direction. In the second coating step S5, the adhesive 7 is applied to the second coating portion 86 located at a position closer to the outer end of the back yoke forming portion 83 than the first coating portion 85 on the surface of one side in the thickness direction of the core sheet forming member 82 bent into an arc shape in the bending step S4. In the bonding and laminating step S6, the core sheet forming member 82 on which the adhesive 7 is applied to the first coating portion 85 and the second coating portion 86, respectively, is wound into a spiral shape, and is laminated and bonded in the thickness direction.

[0044] In the manufacturing method of the laminated core 1 of the present embodiment, after the adhesive 7 is applied to the first coating portion 85 on the surface of one side in the thickness direction of the core sheet forming member 82 in the first coating step S3, the end portion of the back yoke forming portion 83 of the core sheet forming member 82 on the other side in the width direction is pressed toward one side in the width direction in the bending step S4 to bend the back yoke forming portion 83 into an arc shape. Then, in the second coating step S5, the adhesive 7 is applied to the second coating portion 86 on the surface of one side in the thickness direction of the core sheet forming member 82 and located at a position closer to the end portion of the outer side of the back yoke forming portion 83 than the first coating portion 85.

[0045] Thus, when the adhesive 7 is applied to the first application portion 85, it is not easily affected by the rebound caused by the bending of the back yoke forming portion 83. Furthermore, in the back yoke forming portion 83, the adhesive 7 is applied to the second application portion 86 which is closer to the deformation site when bending than the first application portion 85 after the bending step S4 of bending the back yoke forming portion 83. Thus, the adhesive 7 can be applied to the second application portion 86 without being affected by the bending of the back yoke forming portion 83.

[0046] Therefore, the adhesive 7 can be applied with high accuracy to the first coating portion 85 and the second coating portion 86 of the core sheet forming member 82. Therefore, when the spiral core sheet forming members 82 are stacked and bonded in the thickness direction, bonding can be performed with higher accuracy and reliability.

[0047] In the present embodiment, the first coating portion 85 is located on one surface in the thickness direction of the teeth portion 4. The second coating portion 86 is located on one surface in the thickness direction of the back yoke forming portion 83.

[0048] The above-mentioned springback may occur in the core sheet forming member 82 in the state where the back yoke forming portion 83 is bent. In this case, the positions of the first coating portion 85 and the second coating portion 86 on the surface of one side in the thickness direction of the core sheet forming member 82 after the back yoke forming portion 83 is bent are as follows: Fig.10 Therefore, in the core sheet forming member 82 after the back yoke forming portion is bent, it is difficult to apply the adhesive 7 to the first application portion 85 of the teeth 4 having a narrower area than the back yoke forming portion 83 .

[0049] On the other hand, in the present embodiment, the adhesive 7 is applied to the teeth 4 in the first application step S3 before the back yoke forming portion 83 is bent. Therefore, the adhesive 7 can be easily applied to the teeth 4 without being affected by the above-mentioned springback.

[0050] In the present embodiment, in the bending step S4, a bending jig 9 is used, which has: a curved portion 91, when the back yoke forming portion 83 is observed in the thickness direction, the curved portion 91 is in the shape of an arc extending in the circumferential direction with the central axis P as the center, and the back yoke forming portion is bent into an arc shape; a plane portion 92, which protrudes from the curved portion 91 to the inner end of the back yoke forming portion 83 at a position opposite to the surface on one side of the thickness direction of the back yoke forming portion 83, and the curved portion 91 presses the outer end of the back yoke forming portion 83 in the width direction, so that the back yoke forming portion 83 is bent into an arc shape when observed in the thickness direction. The first coating portion 85 is located on the surface on one side of the tooth portion 4 in the thickness direction. The second coating portion 86 is located on the surface on one side of the back yoke forming portion 83 in the thickness direction, and is located at a portion overlapping with the plane portion 92 when the back yoke forming portion 83 is observed in the thickness direction.

[0051] The flat surface portion 92 of the bending jig 9 has a flat surface portion 92 protruding toward the inner end at a position opposite to the surface on one side in the thickness direction of the back yoke forming portion 83, and when the core sheet forming member 82 is bent into an arc shape, the core sheet forming member 82 is restricted from moving in the thickness direction. That is, when the surface on one side in the thickness direction of the back yoke forming portion 83 is bent into an arc shape, it sometimes contacts the flat surface portion 92.

[0052] In the present embodiment, in the first coating step S3, the adhesive 7 is applied to the tooth portion 4. When the back yoke forming portion 83 is bent into an arc shape, the adhesive 7 is not applied to the back yoke forming portion 83 in contact with the bending jig 9. Therefore, the adhesive 7 applied to the first coating portion 85 in the first coating step S3 is prevented from being removed in the bending step S4. Therefore, it is possible to suppress the reduction in the adhesive force of the laminated iron core 1. Therefore, it is possible to provide a manufacturing method for the laminated iron core 1 that can fix the iron core sheet forming component 82 more accurately and reliably in a state where the iron core sheet forming component 82 is stacked in the thickness direction.

[0053] In addition, in the present embodiment, the area of ​​the second coating portion 86 is larger than the area of ​​the first coating portion 85 .

[0054] Thus, when the adhesive 7 is applied to the second application portion 86 in the second application step S5, even when the core sheet forming member 82 rebounds, the adhesive 7 can be more reliably applied to the second application portion 86. Therefore, a method for manufacturing a laminated core 1 that can more accurately and reliably fix the core sheet forming members 82 in a state where they are stacked in the thickness direction can be provided.

[0055] The laminated core 1 of the exemplary embodiment of the present invention manufactured by the above process is a cylindrical laminated core 1 in which the core sheets 2 are laminated in the thickness direction and extend along the above-mentioned axis, and the core sheets 2 have a plate-shaped back yoke portion 3 extending spirally with the axis as the center and a plurality of plate-shaped teeth 4 extending radially inward from the back yoke portion 3. The laminated core 1 has a plurality of bonded portions 26 bonded in the thickness direction by an adhesive 7 in a state where the core sheets 2 are laminated in the thickness direction. The plurality of bonded portions 26 include a first bonded portion 261 and a second bonded portion 262 located closer to the outer peripheral side of the laminated core 1 than the first bonded portion 261.

[0056] The laminated core 1 having the spirally extending back yoke portion 3 is formed by bending the back yoke portion 3. Therefore, springback that attempts to return the core pieces 2 of the laminated core 1 to the state before bending occurs.

[0057] The laminated core 1 is bonded at multiple locations in the radial direction of the core piece 2. Therefore, even when the back yoke 3 rebounds as described above, the core piece 2 can be bonded and fixed with higher accuracy and reliability. Therefore, a laminated core 1 in which the core piece 2 is fixed with higher accuracy and reliability can be obtained.

[0058] In the present embodiment, the first adhered portion 261 is located at the teeth portion 4 , and the second adhered portion 262 is located at the back yoke portion 3 .

[0059] Thus, a laminated core 1 with improved bonding strength is obtained compared to a laminated core in which only the back yoke portion is bonded or a laminated core in which only the teeth portion is bonded. In addition, two radially separated portions can be bonded thereby. Therefore, the core pieces 2 can be bonded more accurately and reliably in the stacking direction.

[0060] In addition, in the present embodiment, the area of ​​the second adhered portion 262 is larger than the area of ​​the first adhered portion 261 .

[0061] This allows the adhesive 7 to be more reliably applied to the core pieces 2 in a state where springback occurs. Therefore, it is possible to obtain the laminated core 1 in which the core pieces 2 are more reliably bonded with good accuracy in the lamination direction.

[0062] (Other embodiments) The embodiments of the present invention have been described above, but the above embodiments are merely examples for implementing the present invention. Therefore, the present invention is not limited to the above embodiments, and the above embodiments can be appropriately modified and implemented within the scope of the present invention.

[0063] In the above embodiment, the laminated core 1 has a plurality of bonded portions 26, including a first bonded portion 261 located at the tooth portion 4 and a second bonded portion 262 located at the back yoke portion 3. However, the laminated core only needs to have a plurality of bonded portions located at radially different positions. For example, as long as the first bonded portion is located radially inwardly of the second bonded portion, it may not be located at the tooth portion.

[0064] In the above embodiment, the area of ​​the second bonded portion 262 is larger than the area of ​​the first bonded portion 261. However, the area of ​​the first bonded portion and the area of ​​the second bonded portion may be the same. The area of ​​the first bonded portion may also be larger than the area of ​​the second bonded portion.

[0065] In the above embodiment, the first coating portion 85 to which the adhesive 7 is applied in the first coating step S3 is located at the tooth portion 4. The second coating portion 86 to which the adhesive 7 is applied in the second coating step S5 is located at the back yoke portion 3. However, the first coating portion only needs to be located at a position closer to the inner side of the core sheet forming component than the second coating portion. For example, the first coating portion may be located at a position closer to the inner side than the second coating portion of the back yoke portion.

[0066] In the above embodiment, the area of ​​the second coating portion 86 is larger than the area of ​​the first coating portion 85. However, the area of ​​the first coating portion and the area of ​​the second coating portion may be the same. The area of ​​the first coating portion may also be larger than the area of ​​the second coating portion.

[0067] In the above embodiment, the surface in the thickness direction of the core sheet forming member 82 to which the adhesive 7 is applied in the first coating step S3 and the surface in the thickness direction to which the adhesive 7 is applied in the second coating step S5 are the same surface. However, the adhesive may be applied to different surfaces in the thickness direction in the first coating step S3 and the second coating step S5.

[0068] In the bending step S4 of the above-mentioned embodiment, the outer end of the core sheet forming member 82 is pressed toward one side in the width direction by the bending jig 9. However, in the bending step S4, the outer end of the core sheet forming member 82 may be pressed toward one side in the width direction by another method of forming the outer end of the core sheet forming member into an arc shape. For example, the outer end of the core sheet forming member may be pressed toward one side in the width direction by a plurality of rollers arranged in an arc shape along the outer end of the core sheet forming member.

[0069] In the above embodiment, the bending jig 9 has: a curved surface portion 91 extending in the circumferential direction centered on the central axis P; and a pair of flat surfaces 92 and 93 extending toward the central axis P. However, the bending jig may also have the curved surface portion and at least one protrusion extending toward the central axis P. The protrusion only needs to extend toward the central axis P at a position separated from the surface of the core sheet forming component in the thickness direction. Thus, when the core sheet forming component is bent, the core sheet forming component can be restricted from moving in the thickness direction.

[0070] (Structure example) Note that the present technology can adopt the following structures.

[0071] (1) A method for manufacturing a laminated iron core, wherein the laminated iron core is a cylindrical laminated iron core in which a plate-shaped back yoke portion extending spirally with an axis as the center and a plurality of plate-shaped teeth extending radially inward from the back yoke portion are stacked in the thickness direction and extend along the axis. The method for manufacturing the laminated iron core comprises: a punching step, in which a plate-shaped iron core forming component is formed by punching a steel plate, wherein the iron core forming component has a band-shaped back yoke forming portion extending in one direction and a plurality of teeth protruding in the width direction from an end portion on one side in the width direction of the back yoke forming portion; a first coating step, in which an adhesive is applied to a first coating portion located on at least one of the surfaces of one side in the thickness direction and the other side in the thickness direction of the iron core forming component formed by the punching step; and a bending step, in which the first coating portion is coated with the adhesive on the back yoke forming portion of the iron core forming component in the width direction. The end on the other side is pressed toward one side in the width direction, so that the iron core sheet forming component is bent into an arc shape when viewed along the thickness direction; a second coating process, applying adhesive to the second coating portion on the surface of at least one of the one side in the thickness direction and the other side in the thickness direction of the iron core sheet forming component bent into an arc shape by the bending process and located at a position closer to the end on the other side in the width direction of the back yoke forming portion than the first coating portion; and a bonding and laminating process, winding the iron core sheet forming component coated with adhesive on the first coating portion and the second coating portion respectively into a spiral shape, stacking and bonding in the thickness direction.

[0072] (2) In the manufacturing method of the laminated iron core described in (1), the first coating portion is located on a surface of at least one of one side in the thickness direction and the other side in the thickness direction of the tooth portion, and the second coating portion is located on a surface of at least one of one side in the thickness direction and the other side in the thickness direction of the back yoke forming portion.

[0073] (3) In the manufacturing method of the laminated core described in (2), in the bending step, a bending jig is used, which has: a curved portion, when the back yoke forming portion is observed in the thickness direction, the curved portion is in the shape of an arc extending in the circumferential direction with the central axis as the center, and the back yoke forming portion is bent into an arc shape; and a protrusion, which protrudes from the curved portion to the width direction of the back yoke forming portion at a position opposite to the surface on one side of the thickness direction of the back yoke forming portion, and the curved portion presses the end of the back yoke forming portion on the other side of the width direction to one side of the width direction, so that the back yoke forming portion is bent into an arc shape when viewed in the thickness direction. The first coating portion is located on the surface on the thickness direction of the tooth portion. The second coating portion is located on the surface on the thickness direction of the back yoke forming portion, and is located at a portion overlapping with the protrusion when the back yoke forming portion is observed in the thickness direction.

[0074] (4) In the method for manufacturing a laminated iron core according to any one of (1) to (3), the area of ​​the second coating portion is larger than the area of ​​the first coating portion.

[0075] (5) A laminated iron core is a cylindrical laminated iron core in which iron core sheets are laminated in the thickness direction and extended along the axis, the iron core sheet having a plate-shaped back yoke portion extending in a spiral shape with the axis as the center and a plurality of plate-shaped teeth extending radially inward from the back yoke portion. The laminated iron core has a plurality of bonded portions, and the plurality of bonded portions bond the iron core sheets in the thickness direction by an adhesive in a state where the iron core sheets are laminated in the thickness direction. The plurality of bonded portions include a first bonded portion and a second bonded portion that is closer to the outer peripheral side of the laminated iron core than the first bonded portion.

[0076] (6) In the laminated core described in (5), the first bonded portion is located at the teeth portion, and the second bonded portion is located at the back yoke portion.

[0077] (7) In the laminated core described in (5) or (6), the area of ​​the second bonded portion is larger than the area of ​​the first bonded portion.

[0078] The present invention can be applied to a method for manufacturing a laminated core having a back yoke portion extending linearly in the longitudinal direction of the electromagnetic steel sheet and a plurality of teeth extending in the width direction of the electromagnetic steel sheet by punching out a band-shaped electromagnetic steel sheet. Explanation of symbols

[0079] 1-Layered Core 2 Iron chips 21, 21a, Page 1 22, 22b Side 2 26, 26a, 26b: bonded portion 261 first bonded portion 262 second bonded portion 3 Back yoke 31 Cutting 4 teeth 7. Adhesive 80 steel plate 82 Iron core forming parts 83 back yoke forming part 84 Slit 85 first coating part 86 Second coating unit 9 Bending fixture 91 curved face 92 plane part (protrusion) T1 first coating equipment T2 second coating equipment.

Claims

1. A method for manufacturing a laminated core, The laminated core is stacked in the thickness direction with a plate-shaped back yoke portion extending spirally around the axis and a plurality of plate-shaped teeth extending radially inward from the back yoke portion, and is in a cylindrical shape extending along the axis, characterized in that: have: A punching step of punching a steel plate to form a plate-shaped iron core forming component, wherein the iron core forming component has a strip-shaped back yoke forming portion extending in one direction and a plurality of teeth protruding from an end portion on one side in the width direction of the back yoke forming portion in the width direction; A first coating step of coating an adhesive on a first coating portion located on at least one of one side in the thickness direction and the other side in the thickness direction of the core sheet forming member formed by the punching step; A bending step of pressing the end portion on the other side in the width direction of the back yoke forming portion of the core sheet forming component coated with the adhesive at the first coating portion toward one side in the width direction, thereby bending the core sheet forming component into an arc shape when viewed in the thickness direction; A second coating step of coating an adhesive on a second coating portion, the second coating portion being located on at least one of the one side in the thickness direction and the other side in the thickness direction of the iron core sheet forming component bent into an arc shape by the bending step and being located closer to an end portion on the other side in the width direction of the back yoke forming portion than the first coating portion; and In the adhesive lamination step, the core sheet forming member having the adhesive applied to each of the first application portion and the second application portion is spirally wound, and laminated and bonded in the thickness direction.

2. The method for manufacturing a laminated core according to claim 1, wherein: The first coating portion is located on at least one of one side in the thickness direction and the other side in the thickness direction of the tooth portion. The second coating portion is located on at least one of one side in the thickness direction and the other side in the thickness direction of the back yoke forming portion.

3. The method for manufacturing a laminated core according to claim 2, wherein: In the bending process, A bending fixture is used, which has: a curved surface portion, when the back yoke forming portion is observed in the thickness direction, the curved surface portion is in the shape of an arc extending circumferentially with the central axis as the center, and the curved surface portion bends the back yoke forming portion into an arc shape; and a protruding portion, the protruding portion protrudes from the curved surface portion toward the width direction of the back yoke forming portion at a position opposite to the surface on one side of the thickness direction of the back yoke forming portion, and the curved surface portion presses the end portion of the back yoke forming portion on the other side in the width direction toward one side in the width direction, so that the back yoke forming portion is bent into a circular arc shape when observed in the thickness direction, The first coating portion is located on a surface on one side in the thickness direction of the tooth portion. The second coating portion is located on a surface on one side in the thickness direction of the back yoke forming portion and is located at a portion overlapping the protruding portion when the back yoke forming portion is viewed in the thickness direction.

4. The method for manufacturing a laminated core according to any one of claims 1 to 3, characterized in that: The second coating portion has a larger area than the first coating portion.

5. A laminated iron core, wherein the laminated iron core is formed by laminating iron core sheets in the thickness direction to form a cylindrical shape extending along an axis, wherein the iron core sheet has a plate-shaped back yoke portion extending spirally with the axis as the center and a plurality of plate-shaped teeth extending radially inward from the back yoke portion, characterized in that: The plurality of bonded portions are bonded together along the thickness direction by an adhesive in a state where the core sheets are stacked along the thickness direction. The plurality of bonded portions include: a first bonded portion; and A second bonded portion, wherein the second bonded portion is located closer to the outer peripheral side of the laminated core than the first bonded portion.

6. The laminated core according to claim 5, characterized in that The first bonded portion is located at the tooth portion, The second bonded portion is located on the back yoke portion.

7. The laminated core according to claim 5 or 6, characterized in that: The area of ​​the second bonded portion is larger than the area of ​​the first bonded portion.

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