Manufacturing method of laminated iron core and laminated iron core

Abstract

To provide a manufacturing method for a laminated iron core that can be fixed more accurately and reliably.SOLUTION: A manufacturing method of a laminated iron core includes a punching step of forming a plate-shaped core piece forming member 82 having a band-shaped back yoke forming portion 83 extending in one direction and a plurality of teeth portions 4 by punching a steel plate, a first application step of applying an adhesive 7 to a first application portion 85 located on the thickness direction surface of the core piece forming member extending in one direction formed in the punching step, a bending step of pushing, in one direction in the width direction, the other widthwise end of the back yoke forming portion with the adhesive applied to the first application portion to bend the core piece forming member into an arc shape when viewed in the thickness direction, a second application step of applying an adhesive to a second application portion 86 located at a position closer to the other widthwise end of the back yoke forming portion than the first application portion of the core piece forming member whose back yoke forming portion has been bent into an arc shape by the bending step, and an adhesive stacking step of spirally winding and bonding the core piece forming member while being stacked in the thickness direction.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a manufacturing method of a laminated core and a laminated core. [Background technology]

[0002] There is a known method for manufacturing a laminated core in which a strip-shaped steel plate extending in one direction is bent into an arc to form a back yoke part extending in a spiral shape. For example, a laminated core manufactured by such a manufacturing method is disclosed in Patent Document 1, in which a blanked plate having a plurality of teeth protruding from one long side of a strip-shaped back yoke is bent into an arc, a plurality of the arc-shaped blanked plates are combined to form a ring-shaped straight core, and the outer periphery of the straight core is fixed by laser welding.

[0003] Also, a manufacturing method of a laminated core is known in which a plurality of adjacent core pieces in the lamination direction are bonded together with an adhesive. As a laminated core manufactured by such a manufacturing method, for example, a laminated core is disclosed (for example, Patent Document 2), which includes adhesive parts provided between adjacent electromagnetic steel sheets in the lamination direction and bonding the electromagnetic steel sheets together, and weld parts at which the electromagnetic steel sheets are welded together, and the electromagnetic steel sheets are joined together only by the adhesive parts and the weld parts. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2005-143164 A [Patent Document 2] JP 2023-60136 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when a belt-like back yoke portion extending in one direction is bent into an arc to form a spiral, the back yoke portion may undergo springback, returning to the state before being bent. Therefore, when the back yoke portion is fixed in the lamination direction by laser welding as in Patent Document 1, it is necessary to maintain the shape of the laminated core during the laser welding operation.

[0006] In response to this, it is conceivable to maintain the shape of the laminated core by laminating the spiral back yoke portion in the thickness direction and fixing it with an adhesive. However, as described above, springback occurs in the back yoke portion, and therefore, when the back yoke portion is fixed with the adhesive, the back yoke portion may move, making it impossible to fix the back yoke portion accurately and reliably.

[0007] Therefore, there is a demand for a manufacturing method that can more accurately and reliably fix core piece forming members, each of which includes a spiral back yoke portion and a plurality of teeth portions, in a state in which the core piece forming members are stacked in the thickness direction.

[0008] The object of the present invention is to provide a manufacturing method for a laminated core in which core piece forming members including a back yoke portion extending spirally around an axis and a plurality of teeth portions are stacked in the thickness direction, which can more accurately and reliably fix the core piece forming members in a state where they are stacked in the thickness direction. [Means for solving the problem]

[0009] A method for manufacturing a laminated core according to one embodiment of the present invention is a method for manufacturing a cylindrical laminated core extending along the axis, in which a plate-shaped back yoke portion extending spirally around an axis and a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion are stacked in the thickness direction. The method for manufacturing the laminated core includes a punching step of punching a steel plate to form a plate-shaped core piece forming member having a band-shaped back yoke forming portion extending in one direction and a plurality of teeth portions protruding in the width direction from an end portion on one side in the width direction of the back yoke forming portion, a first application step of applying an adhesive to a first application portion located on at least one surface of one thickness direction side and the other thickness direction side of the core piece forming member formed in the punching step, and a second application step of applying the adhesive to the first application portion on the other width direction side of the back yoke forming portion of the core piece forming member to which the adhesive has been applied. the core piece forming member is bent into an arc shape when viewed in the thickness direction by pressing the end portion on one side in the width direction; a second application process of applying adhesive to a second application section located on at least one of the surfaces of the one thickness direction side and the other thickness direction side of the core piece forming member bent into an arc shape by the bending process and at a position closer to the end portion on the other width direction side of the back yoke forming section than the first application section; and an adhesive stacking process of spirally winding the core piece forming member to which adhesive has been applied on the first application section and the second application section, and stacking and bonding them in the thickness direction.

[0010] A laminated core according to one embodiment of the present invention is a cylindrical laminated core in which core pieces, each having a plate-shaped back yoke portion extending spirally around an axis and a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion, are stacked in the thickness direction and extend along the axis. The laminated core has a plurality of adherends that adhere the core pieces in the thickness direction with an adhesive while they are stacked in the thickness direction. The plurality of adherends include a first adherend and a second adherend located on the outer periphery side of the laminated core relative to the first adherend. Effect of the Invention

[0011] According to the present invention, in a laminated core in which core piece forming members including a back yoke portion extending spirally around an axis and a plurality of teeth portions are stacked in the thickness direction, a manufacturing method can be provided that enables the core piece forming members to be fixed more accurately and reliably in a state in which they are stacked in the thickness direction. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view showing a schematic configuration of a laminated core according to the first embodiment. [Diagram 2] FIG. 2 is an exploded view of the laminated core. [Diagram 3] FIG. 3 is a partially enlarged view of FIG. 2, illustrating the position of the bonded portion. [Figure 4] FIG. 4 is a cross-sectional view of the laminated core, illustrating the bonded portion. [Diagram 5] FIG. 5 is a flowchart showing a method for manufacturing the laminated core according to the first embodiment. [Figure 6] FIG. 6 is a diagram of a punched steel plate. [Figure 7] FIG. 7 is a plan view showing a schematic configuration of an iron core piece forming member. [Figure 8] FIG. 8 is a diagram illustrating the relationship between the positions where adhesive is applied to the core piece forming member in the first application step and the second application step, and the positions where the core piece forming member is bent in the bending step. [Figure 9] FIG. 9 is a diagram for explaining an example of a method for pushing the other widthwise end of the core piece forming member in one direction in the width direction. [Figure 10] FIG. 10 is a diagram illustrating a case where springback occurs in the core piece forming member in the second applying step. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. Note that the same or corresponding parts in the drawings are given the same reference numerals and their description will not be repeated. Furthermore, the dimensions of the components in each drawing do not faithfully represent the actual dimensions of the components and the dimensional ratios of each component.

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

[0015] In the following description, the terms "fix," "connect," and "attach" include not only cases where members are directly fixed to each other, but also cases where members are fixed to each other via other members. In other words, in the following description, the terms "fix," "connect," and "attach" include the meanings of direct and indirect fixation between members.

[0016] (Embodiment 1) (Laminated core configuration) A laminated core 1 according to a first exemplary embodiment of the present invention will be described with reference to Fig. 1 to Fig. 4. As shown in Fig. 1, the laminated core 1 is cylindrical and extends along a central axis P. The laminated core 1 is formed by stacking in the thickness direction a plate-shaped back yoke portion 3 that extends spirally around the central axis P of the laminated core 1, and a plurality of plate-shaped teeth portions 4 that extend radially inward from the back yoke portion 3 of the laminated core 1. The back yoke portion 3 has a slit 31 extending radially outward from an end face on the inner circumferential side between adjacent teeth portions 4 in the circumferential direction.

[0017] The laminated core 1 is formed by punching out a plate-shaped electromagnetic steel sheet, which is the material of the laminated core 1, to form a band-shaped core piece forming member 82, and then winding the core piece forming member 82 in a spiral shape when viewed in the thickness direction. In the laminated core 1, the back yoke portions 3 and the teeth portions 4 are laminated together in the thickness direction. For the sake of explanation, the portions that make up each layer of the laminated core 1 will be referred to as core pieces 2 below. The manufacturing method of the laminated core 1 will be described in detail later.

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

[0019] As shown in Figs. 1 and 2, the core piece 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] Fig. 3 is a partially enlarged view of Fig. 2. As shown in Fig. 2 and Fig. 3, the core piece 2 has a plurality of adherend portions 26 on the first surface 21 adjacent to the second surface 22 in the lamination direction in the laminated core 1. The core piece 2 also has a plurality of adherend portions 26 on the second surface 22 adjacent to the first surface 21 in the lamination direction in the laminated core 1. The plurality of adherend portions on the second surface 22 are not shown in Figs. 2 and 3. When the core piece 2 is viewed in the thickness direction, the plurality of adherend portions 26 on the first surface 21 and the plurality of adherend portions on the second surface 22 overlap.

[0021] As shown in Fig. 4, adjacent portions of the core pieces 2 in the laminated core 1 in the lamination direction are bonded by adhesive 7 at bonded portions 26. More specifically, the core pieces 2 are bonded by adhesive 7 at bonded portions 26 of the first surface 21 to bonded portions 26b of the second surface 22b adjacent to the first surface 21 in the lamination direction. Also, the core pieces 2 are bonded by adhesive 7 at bonded portions 26 of the second surface 22 to bonded portions 26a of the first surface 21a adjacent to the second surface 22 in the lamination direction. Note that in an actual laminated core 1, the portions of the core pieces 2 not bonded by adhesive 7 are in contact with each other in the lamination direction, but for the sake of explanation, Fig. 4 shows these portions spaced apart.

[0022] The adhesive 7 is an adhesive capable of bonding metals together, and is, for example, an anaerobic adhesive.

[0023] 3, the multiple adherend portions 26 include a first adherend portion 261 and a second adherend portion 262 located on the outer periphery side of the laminated core 1 relative to the first adherend portion 261. In this embodiment, the first adherend portion 261 is located on the teeth portion 4, and the second adherend portion 262 is located on the back yoke portion 3.

[0024] (Manufacturing method of laminated core) An exemplary method for manufacturing the laminated core 1 having the above-mentioned configuration will be described in detail with reference to FIGS.

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

[0026] In the preparation step S1, an electromagnetic steel sheet, which is a magnetic material, is prepared. In this embodiment, the electromagnetic steel sheet is a strip that is long in one direction. In the following, the electromagnetic steel sheet is referred to as a steel sheet 80.

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

[0028] Fig. 6 is an example of a diagram showing a punching out of a core piece forming member 82 in a steel plate 80. In Fig. 6, the area of ​​the steel plate 80 to be punched out is shaded for ease of explanation. The punching step S2 is performed by pressing. That is, in the punching step S2, the area shaded in Fig. 6 is punched out using a punch. A detailed explanation of the press working is omitted.

[0029] In the punching step S2, the region of the steel plate 80 is punched out to form an iron core piece forming member 82 having a back yoke forming portion 83, a plurality of teeth portions 4, and slits 84.

[0030] FIG. 7 is a diagram showing a schematic configuration of a surface on one side in the thickness direction of the core piece forming member 82. As shown in FIG. 7, the back yoke forming portion 83 is in the shape of a strip extending in the longitudinal direction of the steel plate 80. The teeth portions 4 extend in one width direction from an end portion on one side of the back yoke forming portion 83 in the width direction. The slits 84 are formed between the adjacent teeth portions 4 in the back yoke forming portion 83. The slits 84 extend from an end portion on the one side of the width direction of the back yoke forming portion 83 to the other side of the width direction. In the following, for the sake of explanation, the end portion on the one side of the width direction of the back yoke forming portion 83 is referred to as an inner end portion of the back yoke forming portion 83, and the end portion on the other side of the width direction of the back yoke forming portion 83 is referred to as an outer end portion of the back yoke forming portion 83. The back yoke forming portions 83 are laminated in the thickness direction to form the back yoke portion 3 of the laminated core 1. The outer end of the back yoke forming portion 83 is laminated in the thickness direction to form the outer peripheral surface of the back yoke portion 3 of the laminated core 1.

[0031] In FIG. 7, reference numeral 85 denotes a first application portion to which adhesive 7 is applied in a first application step S3. Reference numeral 86 denotes a second application portion to which adhesive 7 is applied in a second application step S5. In this embodiment, the area of ​​the second application portion 86 is larger than the area of ​​the first application portion 85. In this embodiment, the first application portion 85 is located on a surface on one thickness direction side of the teeth portion 4. The second application portion 86 is located on a surface on one thickness direction side of the back yoke forming portion 83.

[0032] In a first application step S3, adhesive 7 is applied to a first application portion 85 located on one surface in the thickness direction of core piece forming member 82 extending in one direction formed in punching step S2. For example, as shown in Fig. 8, adhesive 7 is applied to first application portion 85 of core piece forming member 82 by a first application device T1 installed at position P1.

[0033] In the bending process S4, the outer end of the back yoke forming portion 83, with the adhesive 7 applied to the first application portion 85, is pushed in one direction in the width direction to bend the core piece forming member 82 into an arc shape when viewed in the thickness direction. That is, by pushing the outer end toward the central axis P, the gaps of the slits 84 formed in the back yoke forming portion 83 are crushed. As a result, the length of the inner end of the back yoke forming portion 83 becomes shorter than the length of the outer end. Therefore, the core piece forming member 82 is formed into an arc shape when viewed in the thickness direction. By crushing the gaps of the slits 84, the cuts 31 in the laminated core 1 are formed.

[0034] For example, in the bending step S4, the outer end of the back yoke forming portion 83 is pressed by a bending jig 9 shown in FIGS.

[0035] 8 and 9, the bending jig 9 has an arc shape extending in the circumferential direction centered on the central axis P. 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, 93 extending from the curved surface portion 91 toward the central axis P. The curved surface portion 91 and the pair of flat surfaces 92, 93 form a space S that is open on the inner circumferential side and extends in an arc shape. The outer circumferential side of a disk-shaped member 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 circumferential surface 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 aligned along the inner circumferential surface of the curved portion 91 while the core piece forming member 82 is moved in the direction of the outline arrow relative to the bending jig 9. As a result, the front side of the back yoke forming portion 83 in the moving direction 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] 9, the pair of flat surfaces 92, 93 are located on one side and the other side of the core piece forming member 82 in the thickness direction. The pair of flat surfaces 92, 93 restrict the core piece forming member 82 from moving in the thickness direction when the core piece forming member 82 is bent into an arc shape. One flat surface 92 of the pair of flat surfaces 92, 93 protrudes from the curved surface portion 91 toward the inner end of the back yoke forming portion 83 at a position facing the surface on which the adhesive 7 is applied in the first application step S3. Therefore, the flat surface portion 92 is a protruding portion of the present invention.

[0038] In this embodiment, the space S accommodates the outer side of the back yoke forming portion 83 of the core piece forming member 82 in a state in which the adhesive 7 has been applied to the surface of the teeth portion 4 in the first application step S3. A second application portion 86 (described later) located on one surface in the thickness direction of the back yoke forming portion 83 is accommodated in the space S. In other words, the portion of the core piece forming member 82 to which the adhesive 7 has been applied is not accommodated in the space S. Therefore, even if the core piece forming member 82 moves in the thickness direction within the space S, the adhesive 7 applied in the first application step S3 does not come into contact with the inner surface of the bending jig 9. Therefore, the adhesive 7 applied in the first application step S3 is not removed by the bending jig 9.

[0039] In a second application step S5, adhesive 7 is applied to a second application portion 86 located on one surface in the thickness direction of core piece forming member 82 bent into an arc shape in bending step S4. For example, as shown in Fig. 8, adhesive 7 is applied to second application portion 86 of core piece forming member 82 by a second application device T2 installed at position P2.

[0040] In the bonding and lamination process S6, the core piece forming members 82 are spirally wound and stacked in the thickness direction. As a result, adjacent portions of the core piece forming members 82 in the lamination direction are bonded with the adhesive 7 at the first applicator 85 and the second applicator 86. The portions of the surfaces of the core piece forming members 82 bonded with the adhesive 7 become the bonded portions 26 in the laminated core 1.

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

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

[0043] In the punching step S2, the steel plate 80 is punched to form a plate-shaped core piece forming member 82 having a strip-shaped back yoke forming portion 83 extending in one direction and a plurality of teeth portions 4 protruding in the width direction from one end of the back yoke forming portion 83 in the width direction. In the first application step S3, the adhesive 7 is applied to a first application portion 85 located on one surface in the thickness direction of the core piece forming member 82 formed in the punching step S2. In the bending step S4, the end portion on the other width direction of the back yoke forming portion 83 of the core piece forming member 82 to which the adhesive 7 is applied to the first application portion 85 is pushed in one direction in the width direction to bend the core piece forming member 82 into an arc shape as viewed in the thickness direction. In the second application step S5, the adhesive 7 is applied to a second application portion 86 located on one surface in the thickness direction of the core piece forming member 82 bent into an arc shape in the bending step S4 and closer to the outer end of the back yoke forming portion 83 than the first application portion 85. In the bonding and laminating step S6, the core piece forming members 82 having the adhesive 7 applied to the first and second application portions 85 and 86 are spirally wound and bonded while being laminated in the thickness direction.

[0044] In the manufacturing method of the laminated core 1 according to this embodiment, in a first application step S3, adhesive 7 is applied to a first application portion 85 on one surface in the thickness direction of core piece forming member 82, and then in a bending step S4, an end portion on the other width direction of back yoke forming portion 83 of core piece forming member 82 is pushed in one direction in the width direction to bend back yoke forming portion 83 into an arc shape. Then, in a second application step S5, adhesive 7 is applied to a second application portion 86 located on one surface in the thickness direction of core piece forming member 82 and closer to the outer end portion of back yoke forming portion 83 than the first application portion 85.

[0045] As a result, when adhesive 7 is applied to first applicator 85, it is less susceptible to the influence of springback caused by bending of back yoke forming portion 83. Moreover, adhesive 7 is applied to second applicator 86, which is closer to the area of ​​back yoke forming portion 83 that is deformed during bending than first applicator 85, after bending step S4 in which back yoke forming portion 83 is bent. As a result, adhesive 7 can be applied to second applicator 86 without being influenced by the bending of back yoke forming portion 83.

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

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

[0048] As described above, springback may occur in the core piece forming member 82 in a state in which the back yoke forming portion 83 is bent. In this case, the positions of the first application portion 85 and the second application portion 86 on one surface in the thickness direction of the core piece forming member 82 after the back yoke forming portion 83 is bent move as shown in Fig. 10. Therefore, in the core piece forming member 82 after the back yoke forming portion is bent, it is difficult to apply adhesive 7 to the first application portion 85 located on the tooth portion 4 which has a smaller area than the back yoke forming portion 83.

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

[0050] In the present embodiment, in the bending step S4, when the back yoke forming portion 83 is viewed in the thickness direction, a bending jig 9 having a curved surface portion 91 that is an arc shape extending in the circumferential direction about the central axis P and that bends the back yoke forming portion into an arc shape, and a flat surface portion 92 that protrudes from the curved surface portion 91 toward an inner end portion of the back yoke forming portion 83 at a position facing a surface on one side in the thickness direction of the back yoke forming portion 83, is used to press the outer end portion of the back yoke forming portion 83 in the width direction with the curved surface portion 91 to bend the back yoke forming portion 83 into an arc shape when viewed in the thickness direction. The first application portion 85 is located on the surface on one side in the thickness direction of the teeth portion 4. The second application portion 86 is located on the surface on one side in the thickness direction of the back yoke forming portion 83 and in a portion that overlaps with the flat surface portion 92 when the back yoke forming portion 83 is viewed in the thickness direction.

[0051] The bending jig 9 has a flat portion 92 that protrudes toward the inner end at a position facing one thickness-wise surface of the back yoke forming portion 83, and this flat portion 92 restricts movement of the core piece forming member 82 in the thickness direction when the core piece forming member 82 is bent into an arc. In other words, the surface on one thickness-wise side of the back yoke forming portion 83 may come into contact with the flat portion 92 when it is bent into an arc.

[0052] In this embodiment, in the first application step S3, adhesive 7 is applied to the teeth portions 4. When the back yoke forming portion 83 is bent into an arc, adhesive 7 is not applied to the back yoke forming portion 83 that comes into contact with the bending jig 9. This prevents the adhesive 7 applied to the first application step S3 from being removed in the bending step S4. This makes it possible to suppress a decrease in adhesive strength in the laminated core 1. This makes it possible to provide a manufacturing method for the laminated core 1 that allows the core piece forming members 82 to be fixed more accurately and reliably in a state where they are stacked in the thickness direction.

[0053] In this embodiment, the area of ​​second application part 86 is larger than the area of ​​first application part 85.

[0054] As a result, even if springback occurs in the core piece forming members 82 when applying the adhesive 7 to the second application portion 86 in the second application step S5, the adhesive 7 can be more reliably applied to the second application portion 86. It is therefore possible to provide a manufacturing method for the laminated core 1 that can fix the core piece forming members 82 more accurately and more reliably in a state where they are stacked in the thickness direction.

[0055] The laminated core 1 according to an exemplary embodiment of the present invention manufactured by the above steps is a cylindrical laminated core 1 extending along the axis, in which core pieces 2 are stacked in the thickness direction and each core piece has a plate-shaped back yoke portion 3 extending spirally around an axis and a plurality of plate-shaped teeth portions 4 extending radially inward from the back yoke portion 3. The laminated core 1 has a plurality of adherend portions 26 that are adhered in the thickness direction by an adhesive 7 with the core pieces 2 stacked in the thickness direction. The plurality of adherend portions 26 include a first adherend portion 261 and a second adherend portion 262 located on the outer periphery side of the laminated core 1 relative to the first adherend 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 occurs in the core pieces 2 of the laminated core 1, which tends to return to the state before being bent.

[0057] The above-mentioned laminated core 1 is bonded at a plurality of locations in the radial direction of the core pieces 2. Therefore, even if springback occurs in the back yoke portion 3 as described above, the core pieces 2 can be bonded and fixed more accurately and reliably. Therefore, it is possible to obtain a laminated core 1 in which the core pieces 2 are fixed more accurately and reliably.

[0058] In this embodiment, the first bonded portion 261 is located on the teeth portion 4. The second bonded portion 262 is located on the back yoke portion 3.

[0059] This makes it possible to obtain a laminated core 1 with improved adhesive strength 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. This also makes it possible to bond two locations that are radially separated from each other. This allows the core pieces 2 to be bonded more precisely and reliably in the lamination direction.

[0060] In this embodiment, the area of ​​the second adherend portion 262 is larger than the area of ​​the first adherend portion 261.

[0061] This makes it possible to more reliably apply the adhesive 7 to the core pieces 2 in a state in which springback has occurred. Therefore, it is possible to obtain a laminated core 1 in which the core pieces 2 are more accurately and reliably bonded in the lamination direction.

[0062] (Other embodiments) Although the embodiment of the present invention has been described above, the above-mentioned embodiment is merely an example for carrying out the present invention. Therefore, the present invention is not limited to the above-mentioned embodiment, and it is possible to carry out the above-mentioned embodiment by appropriately modifying it within the scope of the gist of the present invention.

[0063] In the embodiment, the laminated core 1 has a plurality of adherend parts 26 including a first adherend part 261 located on the tooth part 4 and a second adherend part 262 located on the back yoke part 3. However, the laminated core may have a plurality of adherend parts located at different positions in the radial direction. For example, the first adherend part does not have to be located on the tooth part as long as it is located on the radially inner side of the second adherend part.

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

[0065] In the above embodiment, the first applicator 85 that applies the adhesive 7 in the first application step S3 is located on the teeth portion 4. The second applicator 86 that applies the adhesive 7 in the second application step S5 is located on the back yoke portion 3. However, it is sufficient that the first applicator is located more inwardly of the core piece forming member than the second applicator. For example, the first applicator may be located more inwardly of the second applicator in the back yoke portion.

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

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

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

[0069] In the 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, 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. It is sufficient that the protrusion extends toward the central axis P at a position away from the thickness direction surface of the core piece forming member. This makes it possible to restrict movement of the core piece forming member in the thickness direction when bending the core piece forming member.

[0070] (Configuration example) The present technology can also be configured as follows.

[0071] (1) A method for manufacturing a laminated core is a method for manufacturing a cylindrical laminated core extending along the axis, in which a plate-shaped back yoke portion extending spirally around an axis and a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion are stacked in the thickness direction. The method for manufacturing the laminated core includes a punching step of punching a steel plate to form a plate-shaped core piece forming member having a band-shaped back yoke forming portion extending in one direction and a plurality of teeth portions protruding in the width direction from an end portion on one side in the width direction of the back yoke forming portion, a first application step of applying an adhesive to a first application portion located on at least one of the surfaces of one thickness direction side and the other thickness direction side of the core piece forming member formed in the punching step, and a second application step of applying the adhesive to the first application portion on the other width direction side of the back yoke forming portion of the core piece forming member to which the adhesive has been applied. the core piece forming member is bent into an arc shape when viewed in the thickness direction by pressing the end portion on one side in the width direction; a second application process of applying adhesive to a second application section located on at least one of the surfaces of the one thickness direction side and the other thickness direction side of the core piece forming member bent into an arc shape by the bending process and at a position closer to the end portion on the other width direction side of the back yoke forming section than the first application section; and an adhesive stacking process of spirally winding the core piece forming member to which adhesive has been applied on the first application section and the second application section, and stacking and bonding them in the thickness direction.

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

[0073] (3) In the method for manufacturing a laminated core described in (2), in the bending step, a bending jig is used that has a curved surface portion that is an arc-shaped portion extending in a circumferential direction about a central axis when viewed in a thickness direction of the back yoke forming portion and that bends the back yoke forming portion into an arc-shaped portion, and a protrusion portion that protrudes from the curved surface portion toward one side in the width direction of the back yoke forming portion at a position facing the surface on one side in the thickness direction of the back yoke forming portion, to press an end portion on the other side in the width direction of the back yoke forming portion with the curved surface portion to one side in the width direction, thereby bending the back yoke forming portion into an arc-shaped portion when viewed in the thickness direction. The first application portion is located on the surface on one side in the thickness direction of the teeth portion. The second application portion is located on the surface on one side in the thickness direction of the back yoke forming portion and in a portion that overlaps with the protrusion portion when viewed in the thickness direction of the back yoke forming portion.

[0074] (4) In the method for manufacturing a laminated 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) The laminated core is a cylindrical laminated core extending along the axis, in which core pieces are stacked in the thickness direction, each core piece having a plate-shaped back yoke portion extending spirally around an axis and a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion. The laminated core has a plurality of adherends that adhere the core pieces in the thickness direction with an adhesive while the core pieces are stacked in the thickness direction. The plurality of adherends include a first adherend and a second adherend located on the outer periphery side of the laminated core relative to the first adherend.

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

[0077] (7) In the laminated core according to (5) or (6), the area of ​​the second adherend portion is larger than the area of ​​the first adherend portion. [Industrial Applicability]

[0078] The present invention is applicable to a manufacturing method for a laminated core produced by punching a strip-shaped electromagnetic steel sheet and 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. [Explanation of symbols]

[0079] 1 Laminated core 2 Core Pieces 21, 21a 1st page 22, 22b 2nd side 26, 26a, 26b Part to be glued 261 1st adhered part 262 2nd adhered part 3 Back yoke 31 Break 4 Teeth 7. Glue 80 steel plate 82 Core piece forming member 83 Back yoke forming part 84 Slit 85 First Coating Section 86 Second Coating Section 9 Bending fixture 91 Curved surface part 92 Plane part (protruding part) T1 First Coating Device T2 Second Coating Device

Claims

1. A method for manufacturing a cylindrical laminated core in which a plate-shaped back yoke portion extending spirally about an axis and a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion are laminated in a thickness direction and extend along the axis, the method comprising: a punching process for forming a plate-shaped core piece forming member by punching a steel plate, the plate-shaped core piece forming member having a band-shaped back yoke forming portion extending in one direction and a plurality of teeth portions protruding in the width direction from one end of the back yoke forming portion in the width direction; a first application step of applying an adhesive to a first application portion located on at least one of a thickness direction one side and a thickness direction other side of the core piece forming member formed in the punching step; a bending process in which an end portion on the other width direction side of the back yoke forming portion of the core piece forming member on which the adhesive is applied to the first application portion is pushed in one direction in the width direction to bend the core piece forming member into an arc shape as viewed in the thickness direction; a second application step of applying adhesive to a second application portion located on at least one of the thickness direction one side and the thickness direction other side of the core piece forming member bent into an arc shape by the bending step and at a position closer to an end portion of the back yoke forming portion on the width direction other side than the first application portion; an adhesive lamination process in which the iron core piece forming member having the adhesive applied to the first application portion and the second application portion is spirally wound and laminated in the thickness direction while being bonded; having Manufacturing method of laminated core.

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

3. The method for manufacturing a laminated core according to claim 2, In the bending process, using a bending jig having a curved surface portion which, when viewed in a thickness direction of the back yoke forming portion, is arc-shaped extending in a circumferential direction about a central axis and which bends the back yoke forming portion into an arc-shaped shape, and a protruding portion which protrudes from the curved surface portion toward one side in the width direction of the back yoke forming portion at a position facing a surface on one side in the thickness direction of the back yoke forming portion, the end portion on the other side in the width direction of the back yoke forming portion is pressed in one direction in the width direction by the curved surface portion, thereby bending the back yoke forming portion into an arc-shaped shape when viewed in the thickness direction; The first application portion is located on one surface of the tooth portion in a thickness direction, the second coating portion is located on one surface of the back yoke forming portion in a thickness direction and in a portion overlapping the protruding portion when the back yoke forming portion is viewed in the thickness direction. Manufacturing method of laminated core.

4. The method for manufacturing a laminated core according to any one of claims 1 to 3, The area of ​​the second application part is larger than the area of ​​the first application part. Manufacturing method of laminated core.

5. A cylindrical laminated core extending along the axis line is formed by laminating core pieces in a thickness direction, the core pieces having a plate-shaped back yoke portion extending spirally around an axis line and a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion, The iron core pieces are laminated in the thickness direction and have a plurality of adherend portions that are adhered in the thickness direction by an adhesive, The plurality of adherend portions are A first adherend portion; a second adherend portion located on an outer circumferential side of the laminated core relative to the first adherend portion; Including, Laminated core.

6. 6. The laminated core according to claim 5, The first adherend portion is located on the teeth portion, The second adherend portion is located on the back yoke portion. Laminated core.

7. The laminated core according to claim 5 or 6, The area of ​​the second adherend portion is larger than the area of ​​the first adherend portion. Laminated core.

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