Manufacturing method of laminated iron core and laminated iron core

Abstract

To provide a manufacturing method capable of improving the productivity of a laminated iron core in which a plurality of arc-shaped bent core pieces are laminated.SOLUTION: A laminated iron core 1 is a cylindrical laminated iron core in which a plurality of core pieces 2 are laminated in the thickness direction, each core piece having a plate-shaped back yoke portion extending in the circumferential direction and a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion. The core pieces are bonded to other core pieces laminated in the thickness direction via a hardened product 7 of a two-component adhesive bonded to an adherend portion 26 on a surface in the thickness direction. At least one of the core pieces and the other core pieces has one of two types of liquid agents 5, 6 constituting the two-component adhesive attached to at least a part of an area 27 surrounding the adherend portion when viewed in the thickness direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] There is known a laminated core in which a plurality of core pieces are laminated, each of which is formed into an annular shape by bending a strip-shaped steel plate extending in one direction into an arc shape. For example, a stator core has been disclosed, which is made by bending a blank plate having a plurality of teeth protruding from one long side of a strip-shaped back yoke into an arc shape, and combining a plurality of such arc-shaped blank plates to form a ring-shaped straight core. In the stator core, the outer periphery of the straight core is fixed by laser welding (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-143164 A Summary of the Invention [Problem to be solved by the invention]

[0004] A method for manufacturing a laminated core in which a plurality of arc-shaped bent core pieces are stacked includes a bending process for bending the steel plate, a stacking process for stacking the core pieces obtained by the bending process, and a welding process for welding the outer periphery of the stack obtained by the stacking process. The core pieces undergo springback, which causes them to return to the state before being bent. Therefore, it is necessary to maintain the shape of the stack in the welding process. This causes a problem that the manufacturing process becomes complicated and productivity decreases. Therefore, a method for manufacturing a laminated core that can improve productivity is required.

[0005] An object of the present invention is to provide a manufacturing method capable of improving the productivity of a laminated core in which a plurality of core pieces bent into an arc shape are laminated. [Means for solving the problem]

[0006] A laminated core according to an embodiment of the present invention is a cylindrical laminated core in which a plurality of core pieces are laminated in the thickness direction, the core pieces having a plate-shaped back yoke portion extending in the circumferential direction, a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion, and a slit extending radially outward from an end face on the inner circumference side between adjacent teeth portions in the back yoke portion in the circumferential direction. The core pieces are bonded to other core pieces laminated in the thickness direction via a hardened product of a two-component adhesive bonded to the bonded portion on the surface in the thickness direction. At least one of the core pieces and the other core pieces has one of two types of liquid agents constituting the two-component adhesive attached to at least a part of the area surrounding the bonded portion when viewed in the thickness direction.

[0007] A method for manufacturing a laminated core according to one embodiment of the present invention is a method for manufacturing a cylindrical laminated core in which a plurality of core pieces are laminated in the thickness direction, the core pieces having a plate-shaped back yoke portion extending in the circumferential direction, a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion, and a slit extending radially outward from an inner peripheral end face between adjacent teeth portions in the circumferential direction of the back yoke portion. The method for manufacturing the laminated core includes a punching process for forming a plate-shaped core piece forming portion by punching a steel plate, the plate-shaped core piece forming portion having a strip-shaped back yoke forming portion, a plurality of the teeth portions protruding from the back yoke forming portion to one side in the width direction of the back yoke forming portion, and a slit extending toward the other side in the width direction between adjacent teeth portions in the back yoke forming portion, a bending process for bending the core piece forming portion formed in the punching process into an arc shape as viewed in the thickness direction by closing the gaps of the slits, and a coating process for applying a coating material to a first coating portion on one surface in the thickness direction of the core piece forming portion. The method includes a first application process for applying a first liquid agent, one of two types of liquid agents that constitute a two-component adhesive that reacts and hardens upon contact; a second application process for applying a second liquid agent, the other of the two types of liquid agents, to a second application section on the other surface in the thickness direction of the core piece forming section; and an adhesive lamination process for bringing the first liquid agent applied to one surface in the thickness direction by the first application process into contact with the second liquid agent applied to the other surface in the thickness direction by the second application process, by stacking the core piece forming sections bent into an arc shape by the bending process in the lamination direction. Effect of the Invention

[0008] According to the present invention, it is possible to provide a manufacturing method capable of improving the productivity of a laminated core in which a plurality of core pieces bent into an arc shape are laminated. [Brief description of the drawings]

[0009] [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 a plan view showing a schematic configuration of an iron core piece. [Diagram 3]FIG. 3 is a cross-sectional view of the laminated core, illustrating the bonded portion. [Figure 4] FIG. 4 is a diagram that shows a schematic state of the core piece viewed in the thickness direction with other core pieces stacked in the thickness direction removed. [Figure 5A] FIG. 5A is a diagram illustrating a method for bonding objects overlapping in the stacking direction with a honeymoon adhesive. [Figure 5B] FIG. 5B is a diagram illustrating a state in which objects overlapping in the stacking direction are bonded together with a honeymoon adhesive. [Figure 6] FIG. 6 is a flowchart showing a method for manufacturing the laminated core according to the first embodiment. [Figure 7] FIG. 7 is a diagram of a punched steel plate. [Figure 8A] FIG. 8A is a diagram showing a schematic configuration of one surface in the thickness direction of the core piece forming portion. [Figure 8B] FIG. 8B is a diagram showing a schematic configuration of the other surface in the thickness direction of the core piece forming portion. [Figure 9] FIG. 9 is a diagram illustrating the relationship between the first and second coating steps and the bending step. [Figure 10] FIG. 10 is a diagram illustrating a state in which one of two types of liquid agent is applied to one of the core piece forming portions adjacent in the lamination direction, and the other of the two types of liquid agent is applied to the other and bonded. [Figure 11] FIG. 11 is a diagram illustrating a schematic configuration of a laminated core according to a modified example of the first embodiment. [Figure 12] FIG. 12 is a diagram for explaining the positions of the bonded portions of a laminated core according to another embodiment. [Figure 13] FIG. 13 is a diagram illustrating the position where one of two types of liquid agents is attached in a laminated core according to another embodiment. [Figure 14] FIG. 14 is a diagram illustrating positions where two types of liquid agents are attached in a laminated core according to another embodiment. [Figure 15]Figure 15 is a diagram illustrating the state in which one of two types of liquid is applied to one of the core piece forming portions adjacent in the stacking direction, and the other of the two types of liquid is applied to the other, in a manufacturing method of a laminated core according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] 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.

[0011] 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.

[0012] 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.

[0013] (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 has a cylindrical shape extending along a central axis P. In this embodiment, the laminated core 1 has a plurality of plate-shaped core pieces 2 laminated in the thickness direction.

[0014] 1 and 2, the core piece 2 has a back yoke portion 3 extending in the circumferential direction of the laminated core 1, a plurality of teeth portions 4 extending radially inward of the laminated core 1 from the back yoke portion 3, and a slit 31 extending radially outward from an end face on the inner periphery between adjacent teeth portions 4 in the circumferential direction of the back yoke portion 3. The core piece 2 is formed by punching out a plate-shaped electromagnetic steel sheet, which is the material of the core piece 2, to form a strip-shaped core piece forming portion 82, and bending the core piece forming portion 82 into an annular shape when viewed in the thickness direction. Details of the manufacturing method of the laminated core 1 will be described later.

[0015] The core pieces 2 have a first surface 21 which is one surface in the thickness direction, and a second surface 22 which is the other surface in the thickness direction. In this specification, when manufacturing the laminated core 1, the surface on which the next core piece 2 is laminated on the previously laminated core piece 2 is defined as the first surface 21 of each core piece 2. In other words, when the core pieces 2 are laminated from bottom to top, the upper surface is the first surface 21. Note that this is not intended to define the lamination direction of the laminated core 1.

[0016] 2, the core piece 2 has a bonded portion 26 at a predetermined position on the first surface 21. The core piece 2 has a bonded portion 26 at a predetermined position on the second surface 22. When the core piece 2 is viewed in the thickness direction, the bonded portion 26 on the first surface 21 and the bonded portion 26 on the second surface 22 at least partially overlap each other.

[0017] As shown in Fig. 3, a cured product 7 of a two-component adhesive is adhered to the adherend 26. The cured product 7 of the two-component adhesive is obtained by a chemical reaction between a first liquid agent 5 and a second liquid agent 6, which are two types of liquid agents constituting the two-component adhesive, and curing the liquid agent. The cured product 7 of the two-component adhesive is capable of adhering metal materials together.

[0018] That is, the core piece 2 is adhered to another core piece 2 adjacent in the stacking direction via the hardened material 7 adhered to the adherend portion 26. In detail, the core piece 2 is adhered to the adherend portion 26b of the second surface 22b of the other core piece 2b laminated on the first surface 21 side via the hardened material 7 adhered to the adherend portion 26 of the first surface 21. The core piece 2 is adhered to the adherend portion 26a of the first surface 21a of the other core piece 2a laminated on the second surface 22 side via the hardened material 7 adhered to the adherend portion 26 of the second surface 22. Note that in an actual laminated core 1, the portions between the core pieces 2 and 2a where the hardened material 7 is not located are in contact with each other, but in FIG. 3, for the sake of explanation, the portions are shown separated from each other.

[0019] The first liquid agent 5 and the second liquid agent 6 constituting the two-liquid adhesive do not function as an adhesive by themselves. The first liquid agent 5 and the second liquid agent 6 start to harden, for example, by being mixed together. That is, the first liquid agent 5 that is not mixed with the second liquid agent 6 does not harden. The second liquid agent 6 that is not mixed with the first liquid agent 5 does not harden. For example, the first liquid agent 5 is a base agent, and the second liquid agent 6 is a hardener. Note that the first liquid agent 5 may be a hardener, and the second liquid agent 6 may be a base agent.

[0020] In this embodiment, the two-liquid adhesive is a so-called honeymoon adhesive. FIG. 5A and FIG. 5B are diagrams for explaining the honeymoon adhesive. The honeymoon adhesive can start hardening simply by contacting the first liquid agent A with the second liquid agent B. That is, the honeymoon adhesive does not require the first liquid agent A and the second liquid agent B to be mixed in advance. Therefore, for example, the first liquid agent A is applied to one of the two objects X and Y to be bonded, the second liquid agent B is applied to the other, and the two objects X and Y can be bonded by bringing the coated surfaces of the two objects X and Y into contact with each other. The honeymoon adhesive is, for example, an acrylic adhesive. The main component of the first liquid agent A is, for example, an acrylic resin. The main component of the second liquid agent B is, for example, an acrylic resin.

[0021] When the honeymoon adhesive is used to bond the object X and the object Y in the stacking direction, for example, as shown in FIG. 5A, the first liquid agent A is applied to the surface Xa of the object X facing the object Y, and the second liquid agent B is applied to the surface Ya of the object Y facing the object X. Next, the object X and the object Y are stacked in the thickness direction. This brings the first liquid agent A and the second liquid agent B into contact with each other, and as shown in FIG. 5B, the first liquid agent A and the second liquid agent B chemically react with each other. As a result, a cured product C that functions as an adhesive is formed between the object X and the object Y. The object X and the object Y are bonded via the cured product C.

[0022] 4 is a diagram showing a schematic view of the periphery of the adherend portion 26 on the second surface 22 of the iron core piece 2 in a state in which the iron core piece 2a laminated on the second surface 22 side has been removed. As shown in FIG. 3, the hardened material 7 is located between the adherend portion 26 of the iron core piece 2 and the adherend portion 26a of the iron core piece 2a. As described above, the hardened material 7 is obtained by chemically reacting the first liquid agent 5 and the second liquid agent 6. Thus, for example, the hardened material 7 is obtained by applying the second liquid agent 6 to the adherend portion 26 on the first surface 21 of the iron core piece 2, and applying the first liquid agent 5 to the adherend portion 26a on the second surface 22 of the iron core piece 2a.

[0023] At least one of the iron core pieces 2 or the other iron core pieces 2 stacked in the thickness direction of the iron core piece 2 has either the first liquid agent 5 or the second liquid agent 6, which are two types of liquid agents constituting the two-component adhesive, adhered to at least a portion of the region 27 surrounding the adherend portion 26. For example, in this embodiment, the second liquid agent 6 is adhered to the entire region 27 of the iron core piece 2.

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

[0025] Fig. 6 is a flowchart showing an example of a manufacturing method of the laminated core 1. As shown in Fig. 6, 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 out to form a strip-shaped core piece forming portion 82. The core piece forming portion 82 is a portion that will become the core piece 2 in the laminated core 1.

[0028] Fig. 7 is an example of a punching diagram of a core piece forming portion 82 in a steel plate 80. In Fig. 7, the area of ​​the steel plate 80 to be punched 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. 7 is punched out using a punch. A detailed explanation of the press working is omitted.

[0029] In the punching process S2, the region of the steel plate 80 is punched out to form a core piece forming portion 82 having a back yoke forming portion 83, a plurality of teeth portions 4, and slits 84. The back yoke forming portion 83 is in the shape of a strip extending in the longitudinal direction of the steel plate 80. The plurality of teeth portions 4 extend from an end portion of the back yoke forming portion 83 on one side in the width direction to one side in the width direction. The slits 84 are formed between adjacent teeth portions 4 in the back yoke forming portion 83. The slits 84 extend from an end portion of the back yoke forming portion 83 on one side in the width direction to the other side in the width direction.

[0030] In this embodiment, the longitudinal length of the core piece forming portion 82 is approximately the same as the length of the outer circumferential side of the core piece 2. The number of teeth portions 4 of the core piece forming portion 82 is the same as the number of teeth portions 4 of the core piece 2. Figures 8A and 8B show a portion of the core piece forming portion 82 punched out from a steel plate 80.

[0031] Fig. 8A is a diagram showing a schematic configuration of one surface in the thickness direction of core piece forming portion 82. Fig. 8B is a diagram showing a schematic configuration of the other surface in the thickness direction of core piece forming portion 82. In this embodiment, the one surface of core piece forming portion 82 is a surface that becomes first surface 21 of core piece 2. The other surface of core piece forming portion 82 is a surface that becomes second surface 22 of core piece 2.

[0032] In Fig. 8A, reference numeral 85 denotes a first application portion to which the first liquid agent 5 is applied by the first application step S3. In Fig. 8B, reference numeral 86 denotes a second application portion to which the second liquid agent 6 is applied by the 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.

[0033] 8A and 9, in the first application step S3 of this embodiment, the first liquid agent 5 is applied to the first application portion 85 of the first surface 21 of the core piece forming portion 82. In the first application step S3 of this embodiment, the first liquid agent 5 is applied to the first application portion 85 of the first surface 21 of the core piece forming portion 82 in a state in which the core piece forming portion 82 extends in the longitudinal direction of the steel plate 80. That is, the first application step S3 of this embodiment is performed before the core piece forming portion 82 is bent into an arc shape by the bending step S4 described later.

[0034] As shown in FIG. 9, in the bending step S4, the core piece forming portion 82 is bent into an arc shape when viewed in the thickness direction. More specifically, the back yoke forming portion 83 is bent into an arc shape while the gaps of the slits 84 are eliminated. As a result, the length of one end of the back yoke forming portion 83 in the width direction becomes shorter than the length of the other end of the back yoke forming portion 83 in the width direction. Therefore, an annular core piece forming portion 82 is formed when viewed in the thickness direction. The annular core piece forming portion 82 is the core piece 2 of the laminated core 1. The gaps of the slits 84 are eliminated, thereby forming the slits 31 of the laminated core 1. In this specification, the core piece forming portion 82 bent into an arc shape includes an annular core piece forming portion 82.

[0035] 9, in the second application step S5, the second liquid agent 6 is applied to the second application portion 86 on the second surface 22 of the core piece forming portion 82. In this embodiment, in the second application step S5, the second liquid agent 6 is applied to the second application portion 86 on the second surface 22 of the core piece forming portion 82 in a state in which the core piece forming portion 82 has been bent into an arc shape in the bending step S4. Thereafter, the core piece forming portion 82 is bent into an annular shape when viewed from the thickness direction, and the core piece 2 is formed.

[0036] In the adhesive lamination step S6, a plurality of core pieces 2 are stacked in the lamination direction. As a result, as shown in FIG. 10, the first liquid agent 5 applied to the first application portion 85 of the first surface 21 comes into contact with the second liquid agent 6 applied to the second application portion 86 of the second surface 22. Thus, the first liquid agent 5 and the second liquid agent 6 react with each other and harden. As a result, a hardened material 7 is formed between the first application portion 85 of the first surface 21 and the second application portion 86 of the second surface 22. Thus, the core pieces 2 adjacent to each other in the lamination direction are bonded to each other in the lamination direction. The portion on the first surface 21 to which the hardened material 7 is bonded and the portion on the second surface 22 to which the hardened material 7 is bonded become the bonded portion 26 of the laminated core 1.

[0037] Furthermore, in this embodiment, the second liquid agent 6 is applied over a wider area than the first liquid agent 5. Therefore, the second liquid agent 6 that has not reacted with the first liquid agent 5 remains in the area surrounding the adherend portion 26. This allows the second liquid agent 6 to be attached to the area 27 surrounding the adherend portion 26 in the laminated core 1. Note that in an actual laminated core 1, the portions between adjacent core pieces 2 in the lamination direction where the hardened material 7 is not located are in contact with each other, but in FIG. 10, for the sake of explanation, the portions are shown separated from each other.

[0038] 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.

[0039] In the punching process S2, the steel plate 80 is punched to form a plate-shaped core piece forming portion 82 having a strip-shaped back yoke forming portion 83, a plurality of teeth portions 4 protruding from the back yoke forming portion 83 in one width direction of the back yoke forming portion 83, and slits 84 extending between adjacent teeth portions 4 in the back yoke forming portion 83 toward the other width direction. In the bending process S4, the core piece forming portion 82 formed in the punching process S2 is bent into an arc shape as viewed in the thickness direction by squeezing the gaps of the slits 84. In the first application process S3, a first liquid agent 5, one of two types of liquid agents constituting a two-liquid adhesive that reacts and hardens upon contact, is applied to a first application portion 85 on a first surface 21, which is one surface in the thickness direction of the core piece forming portion 82. In a second application step S5, second liquid agent 6, which is the other of the two types of liquid agents, is applied to a second application portion 86 on second surface 22, which is the other surface of core piece forming portion 82 in the thickness direction.

[0040] In the adhesive lamination process S6, the core piece forming portion 82 bent into an arc shape by the bending process S4 is stacked in the lamination direction, thereby bringing the first liquid agent 5 applied to the first surface 21 by the first application process S3 into contact with the second liquid agent 6 applied to the second surface 22 by the second application process S5.

[0041] In the manufacturing method of the laminated core 1 described above, in a first application step S3, a first liquid agent 5 is applied to the first surface 21, which is one surface in the thickness direction of the core piece forming portion 82. In a second application step S5, a second liquid agent 6, which hardens upon contact with the first liquid agent 5, is applied to the second surface 22, which is the other surface in the thickness direction of the core piece forming portion 82. The core piece forming portions 82 are stacked in the stacking direction. Therefore, the first liquid agent 5 applied to the first surface 21 of the core piece forming portion 82 and the second liquid agent 6 applied to the second surface 22 come into contact with each other as a result of the core piece forming portions 82 being stacked in the stacking direction.

[0042] That is, in the above-described manufacturing method, when the core piece forming portions 82 are stacked in the stacking direction, the core piece forming portions 82 are adhered in the stacking direction. Therefore, the laminated core 1 can be manufactured more efficiently than a manufacturing method in which the core piece forming portions are stacked and then the outer periphery is fixed in the stacking direction by welding or the like.

[0043] Moreover, the above-described manufacturing method can prevent the adhesive from hardening before the core piece forming portions 82 are laminated, thereby preventing a decrease in adhesive strength between adjacent core piece forming portions 82 in the lamination direction, thereby improving the productivity of the laminated core 1.

[0044] In the present embodiment, in the first application step S3, the first liquid agent 5 is applied to the first application portion 85 of the core piece forming portion 82 before it is bent into an arc shape in the bending step S4.

[0045] After being bent into an arc shape in bending step S4, core piece forming portion 82 experiences springback, which causes core piece forming portion 82 to return to its original state before being bent. Therefore, it may be difficult to apply a liquid agent to a specific position on core piece forming portion 82 after being bent in bending step S4.

[0046] In contrast, in the above-described manufacturing method, the first liquid agent 5 is applied to the core piece forming portion 82 before it is bent into an arc shape. This makes it possible to easily apply the first liquid agent 5 to a specific position. This makes it possible to improve the productivity of the laminated core 1.

[0047] In the present embodiment, in the second application step S5, the second liquid agent 6 is applied to the second application portion 86 of the core piece forming portion 82 bent into an arc shape in the bending step S4.

[0048] This allows the application of the first liquid agent 5 and the application of the second liquid agent 6 to be performed at different positions or in different processes on the core piece forming portion 82. This improves the workability of manufacturing the laminated core 1. This allows the productivity of the laminated core 1 to be improved.

[0049] In this embodiment, the area of ​​the second application portion 86 is larger than the area of ​​the first application portion 85. This makes it possible to easily apply the second liquid agent 6 even if springback occurs in the core piece forming portion 82.

[0050] The second liquid agent may be applied to the second coated portion of the core piece forming portion before it is bent into an arc shape by the bending process S4. The first liquid agent may be applied to the first coated portion of the core piece forming portion bent into an arc shape by the bending process S4. The first liquid agent may be applied to the first coated portion after the second liquid agent is applied to the second coated portion. However, in order to improve productivity, it is preferable to carry out either one of the steps of applying the first liquid agent to the first coated portion and the step of applying the second liquid agent to the second coated portion before the bending process S4, and to carry out the other step after the bending process S4.

[0051] The laminated core 1 according to an exemplary embodiment of the present invention manufactured by the above process is a cylindrical laminated core 1 in which a plurality of core pieces 2 are laminated in the thickness direction, the core pieces 2 having a plate-shaped back yoke portion 3 extending in the circumferential direction, a plurality of plate-shaped teeth portions 4 extending radially inward from the back yoke portion 3, and a slit extending radially outward from the inner end face between the circumferentially adjacent teeth portions in the back yoke portion. The core pieces 2 are bonded to other core pieces 2a laminated in the thickness direction via a hardened product 7 of a two-component adhesive bonded to the bonded portion 26 on the second surface 22. At least one of the core pieces 2 and the other core pieces 2a has one of two types of liquid agents constituting the two-component adhesive attached to at least a part of an area 27 surrounding the bonded portion 26 when viewed in the thickness direction.

[0052] In the above-described laminated core 1, adjacent core pieces 2 in the lamination direction are bonded to each other at bonded portions 26 on the surfaces in the thickness direction by the hardened product 7 of the two-component adhesive. That is, adjacent core pieces 2 in the lamination direction can be bonded to each other when the core pieces are laminated in the manufacturing process. Therefore, the laminated core 1 is obtained by a more efficient manufacturing method than a laminated core obtained by a manufacturing method in which adjacent core pieces 2 in the lamination direction are joined to each other by welding the outer periphery after laminating the core pieces 2.

[0053] The hardened product 7 is obtained by a chemical reaction between the first liquid agent 5 and the second liquid agent 6 that constitute the two-component adhesive. At least one of the core pieces 2 adjacent in the lamination direction has either the first liquid agent 5 or the second liquid agent 6 applied to an area 27 surrounding the adherend portion 26. In other words, the other of the first liquid agent 5 and the second liquid agent 6 was not applied to the area 27. In other words, in the laminated core 1 having the above-mentioned configuration, the area applied with the first liquid agent 5 and the area applied with the second liquid agent 6 are partially different.

[0054] Therefore, the laminated core 1 can be manufactured without strictly matching the area to which the first liquid agent 5 is applied and the area to which the second liquid agent 6 is applied in the process of applying the first liquid agent 5 and the second liquid agent 6. Therefore, the laminated core 1 can be manufactured easily. Therefore, it is possible to provide a laminated core 1 with improved productivity.

[0055] In this embodiment, one of the two types of liquid agent is attached to a region 27 surrounding the adherend portion 26 when viewed in the thickness direction in either the iron core piece 2 or the other iron core piece 2a.

[0056] That is, in this embodiment, one of the two types of liquid agents is applied to the adherend portion 26, and the other of the two types of liquid agents is applied to an area wider than the adherend portion 26, including the adherend portion 26. That is, the laminated core 1 can be manufactured without the need to precisely position the core pieces 2 when applying the other type of liquid agent. Therefore, it is possible to provide a laminated core 1 with improved productivity.

[0057] In this embodiment, the two-part adhesive is a honeymoon adhesive that hardens when the first liquid agent 5 and the second liquid agent 6 come into contact with each other.

[0058] In a honeymoon type adhesive that hardens when two types of liquid agents come into contact with each other, there is no need to mix the first liquid agent 5 and the second liquid agent 6 in advance. This makes it possible, for example, to apply the first liquid agent 5 to one surface of the core pieces 2 and the second liquid agent 6 to the other surface of the core pieces 2, and then bring the first liquid agent 5 and the second liquid agent 6 into contact with each other and harden when the core pieces 2 are laminated. This makes it possible to improve the productivity of the laminated core 1.

[0059] Furthermore, by using a honeymoon adhesive, it is possible to prevent the adhesive from hardening before the core pieces 2 are laminated. This makes it possible to prevent a decrease in adhesive strength between adjacent core pieces 2 in the lamination direction. Therefore, it is possible to provide a laminated core 1 with improved productivity.

[0060] (Modification of the first embodiment) Next, a laminated core 101 according to a modification of embodiment 1 will be described with reference to Fig. 11. In this modification, the laminated core 101 is formed by a spiral method in which a strip-shaped core piece forming portion punched into a predetermined shape is bent into an arc shape when viewed in the thickness direction and wound into a spiral shape.

[0061] 11 is a partially exploded view of the laminated core 101. The back yoke portion 103 of the laminated core 101 of this modified example extends spirally around the axis and is laminated in the lamination direction.

[0062] Therefore, the core pieces 102 of the laminated core 101 are formed by the core piece forming portion. In Fig. 11, the boundary between the core piece 102 and other core pieces 102a laminated in the thickness direction of the core piece 102 in the laminated core 101 is shown by a dashed dotted line.

[0063] In a laminated core in which straight-shaped steel plates are bent into an arc and wound spirally around an axis, springback may occur after the steel plates are wound spirally, which may reduce the dimensional accuracy of the laminated core.

[0064] In contrast, in the laminated core 101 of this embodiment, the core pieces 102 adjacent in the lamination direction are adhered to each other at the adherend portions 26 when the core pieces are laminated. This makes it possible to suppress springback from occurring after the core piece forming portion is wound spirally. This allows the laminated core 101 to be manufactured efficiently. This makes it possible to provide a laminated core 101 with improved productivity.

[0065] (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.

[0066] In the above embodiment, the adherend portion 26 is located on the back yoke portion 3, 103. However, as shown in Fig. 12, the adherend portion 226 of the core piece 202 may include a tooth adherend portion 226a located on the tooth portion 4 and a back yoke adherend portion 226b located on the back yoke portion 203. This makes it possible to obtain a laminated core 201 in which adjacent core pieces 202 in the lamination direction are more reliably adhered to each other.

[0067] In the embodiment, when the core piece 2 is viewed in the thickness direction, one of the two types of liquid is attached to the region 27 surrounding the adherend portion 26 of the core piece 2. When viewed in the thickness direction, neither of the two types of liquid is attached to the region surrounding the adherend portion 26 of the other core piece 2a adjacent to the core piece 2 in the stacking direction. However, one of the two types of liquid may be attached to the region surrounding the adherend portion of one of the iron core pieces adjacent in the stacking direction. One of the two types of liquid may be attached to the region surrounding both adherend portions of the iron core pieces adjacent in the stacking direction.

[0068] In the embodiment, the second liquid agent 6 is attached to the entire region 27 surrounding the adherend portion 26 of the core piece 2 when viewed in the thickness direction of the core piece 2. However, the first liquid agent may be attached to the entire region surrounding the adherend portion of the core piece when viewed in the thickness direction.

[0069] 13, the second liquid agent 6 may be attached to a part of an area 327 surrounding the adherend portion 326 of the core piece 302 when viewed in the thickness direction of the core piece 302. The first liquid agent may be attached to a part of an area surrounding the adherend portion of the core piece when viewed in the thickness direction.

[0070] Also, the first liquid agent may be attached to a part of the region, and the second liquid agent may be attached to the remainder of the region. Alternatively, the first liquid agent may be attached to a part of the region, the second liquid agent may be attached to another part of the region, and neither the first liquid agent nor the second liquid agent may be attached to the remainder of the region.

[0071] Also, as shown in Fig. 14, the second liquid agent 6 may be attached to a part of the region 427a surrounding the adherend portion 426 of one of the iron core pieces 402 adjacent in the stacking direction, and the first liquid agent 5 may be attached to a part of the region surrounding the other iron core piece. Note that for the sake of explanation, the other iron core piece is not shown in Fig. 14. Also, in Fig. 14, when one iron core piece 402 and the other iron core piece are viewed in the stacking direction, the part to which the first liquid agent 5 is attached in the region surrounding the adherend portion of the other iron core piece is shown surrounded by a two-dot chain line on the iron core piece 402.

[0072] In the above embodiment, the contour of the adherend portion 26, 326 is circular. The contour of the adherend portion 426 is semicircular. However, the contour of the adherend portion may be polygonal or elliptical. The contour line of the adherend portion does not have to be curved. The contour line of the adherend portion may be, for example, wavy.

[0073] In the above-described embodiment, the iron core pieces 2, 2a, 2b, 102, 102a, 302, 402 have portions to which the hardened material 7 is not adhered and to which the first liquid agent 5 or the second liquid agent 6 is not adhered. However, the iron core pieces may have the first liquid agent or the second liquid agent adhered to the entire portion to which the hardened material 7 is not adhered.

[0074] In the above embodiment, the outline of the first application part 85 is circular. The outline of the second application part 86 is rectangular. However, the outline of the first application part may be polygonal or elliptical. The outline of the second application part may be another polygonal shape or may be circular. The outline of the second application part does not have to be linear. The outline of the second application part may be, for example, wavy.

[0075] In the embodiment, the area of ​​the second application part 86 to which the second liquid agent 6 is applied is larger than the area of ​​the first application part 85 to which the first liquid agent 5 is applied. However, the area of ​​the first application part and the area of ​​the second application part may be the same. The area of ​​the first application part may be larger than the area of ​​the second application part.

[0076] As in the above embodiment, the area of ​​the second coating portion is preferably larger than the area of ​​the first coating portion. In this case, as shown in FIG. 15, in the second coating step S5, the second liquid agent 6 may be applied in a film shape to the second coating portion 586 on the second surface 522. That is, the first liquid agent 5 may be applied narrowly and highly to the first coating portion 585 on the first surface 521 to be applied first, and the second liquid agent 6 may be applied widely and thinly to the second coating portion 586 on the second surface 522 to be applied later. This allows the first liquid agent 5 and the second liquid agent 6 to easily react and harden without increasing the amount of the second liquid agent 6 used. Therefore, it is possible to suppress a decrease in the adhesive strength between the core piece forming portions 582 adjacent to each other in the lamination direction. Therefore, it is possible to improve the productivity of the laminated core.

[0077] In the embodiment, the second liquid agent 6 is applied to a portion of the surface of the core piece forming portion 82. However, the second liquid agent may be applied to the entire surface of the core piece forming portion. In other words, the second application portion to which the second liquid agent is applied may be the entire surface of one of the surfaces in the thickness direction of the core piece forming portion.

[0078] In the above embodiment, in the first application step S3, the first liquid agent 5 is applied to the first surface 21, and in the second application step S5, the second liquid agent 6 is applied to the second surface 22. However, the first liquid agent may be applied to the second surface, and the second liquid agent may be applied to the first surface. Both the first liquid agent and the second liquid agent may be applied to the first surface. Both the first liquid agent and the second liquid agent may be applied to the second surface.

[0079] (Configuration example) The present technology can also be configured as follows.

[0080] (1) The laminated core is a cylindrical laminated core in which a plurality of core pieces are laminated in the thickness direction, the core pieces having a plate-shaped back yoke portion extending in the circumferential direction, a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion, and a slit extending radially outward from an end face on the inner circumference between adjacent teeth portions in the back yoke portion in the circumferential direction. The core pieces are bonded to other core pieces laminated in the thickness direction via a hardened product of a two-component adhesive bonded to the bonded portion on the surface in the thickness direction. At least one of the core pieces and the other core pieces has one of two types of liquids constituting the two-component adhesive attached to at least a part of the area surrounding the bonded portion when viewed in the thickness direction.

[0081] (2) In the laminated core described in (1), the two-component adhesive is a honeymoon adhesive that hardens upon contact of the two types of liquid agents.

[0082] (3) In the laminated core according to (1) or (2), either one of the core pieces or the other core pieces is One of the two types of liquid agents is attached to a region surrounding the adherend portion when viewed in the thickness direction.

[0083] (4) In the laminated core according to any one of (1) to (3), the bonded portion includes a teeth bonded portion located in the teeth portion and a back yoke bonded portion located in the back yoke portion.

[0084] (5) In the laminated core according to any one of (1) to (4), the back yoke portion extends spirally around an axis and is laminated in a lamination direction.

[0085] (6) A method for manufacturing a laminated core is a method for manufacturing a cylindrical laminated core in which a plurality of sheets are laminated in the thickness direction, each sheet having a plate-shaped back yoke portion extending in the circumferential direction, a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion, and a slit extending radially outward from an end face on the inner periphery between adjacent teeth portions in the circumferential direction of the back yoke portion. The method for manufacturing the laminated core includes a punching process for forming a plate-shaped core piece forming portion having a band-shaped back yoke forming portion, a plurality of the teeth portions protruding from the back yoke forming portion to one side in the width direction of the back yoke forming portion, and a slit extending toward the other side in the width direction between adjacent teeth portions in the back yoke forming portion, by punching a steel plate; a bending process for bending the core piece forming portion formed in the punching process into an arc shape as viewed in the thickness direction by closing the gaps of the slits; and a coating process for applying a coating liquid to a first coating portion on one surface in the thickness direction of the core piece forming portion. The method includes a first application process for applying a first liquid agent, one of two types of liquid agents that constitute a two-component adhesive that reacts and hardens upon contact; a second application process for applying a second liquid agent, the other of the two types of liquid agents, to a second application section on the other surface in the thickness direction of the core piece forming section; and an adhesive lamination process for bringing the first liquid agent applied to one surface in the thickness direction by the first application process into contact with the second liquid agent applied to the other surface in the thickness direction by the second application process, by stacking the core piece forming sections bent into an arc shape by the bending process in the lamination direction.

[0086] (7) In the method for manufacturing a laminated core described in (6), in the first application step, the first liquid agent is applied to the first application portion of the core piece forming portion before it is bent into an arc shape in the bending step.

[0087] (8) In the method for manufacturing a laminated core described in (7), in the second application step, the second liquid agent is applied to the second application portion of the core piece forming portion that has been bent into an arc shape in the bending step.

[0088] (9) In the method for manufacturing a laminated core described in (8), an area of ​​a second coated portion to which the second liquid agent is applied in the second coating step is larger than an area of ​​a first coated portion to which the first liquid agent is applied in the first coating step. In the second coating step, the second liquid agent is applied to the second coated portion in the form of a film. [Industrial Applicability]

[0089] The present invention is applicable to a manufacturing method for a laminated core in which a strip-shaped electromagnetic steel sheet is punched out to form 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]

[0090] 1, 101, 201 Laminated core 2, 2a, 2b, 102, 102a, 202, 302, 402 Iron core piece 3, 103, 203 Back yoke 4 Teeth 5 First liquid (one of two liquids) 6. Second liquid (the other of the two liquids) 7 Hardened two-component adhesive 21, 21a, 521 1st surface (one surface of the core piece) 22, 22b, 522 Second surface (other surface of the core piece) 26, 26a, 26b, 226, 326, 426 Part to be glued 27, 327, 427a Area surrounding the bonded part 31 Break 80 steel plate 82, 582 Core piece forming part 83 Back yoke forming part 84 Slit 85, 585 First Coating Section 86, 586 Second coating section 226a Teeth adhered part 226b Back yoke bonding part

Claims

1. a cylindrical laminated core in which a plurality of core pieces are laminated in a thickness direction, the core pieces having a plate-shaped back yoke portion extending in a circumferential direction, a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion, and a slit extending radially outward from an end face on an inner periphery between adjacent teeth portions in the back yoke portion in the circumferential direction, The iron core piece is The other iron core pieces laminated in the thickness direction are bonded to the bonded portions on the surfaces in the thickness direction via a cured product of a two-component adhesive, At least one of the iron core piece and the other iron core piece is One of the two types of liquid agents constituting the two-component adhesive is attached to at least a part of the region surrounding the adherend portion when viewed in the thickness direction. Laminated core.

2. 2. The laminated core according to claim 1, The two-part adhesive is a honeymoon adhesive that hardens upon contact of the two liquid agents. Laminated core.

3. The laminated core according to claim 1 or 2, Either the iron core piece or the other iron core piece is One of the two types of liquid agents is attached to a region surrounding the adherend portion when viewed in the thickness direction. Laminated core.

4. The laminated core according to claim 1 or 2, The adherend portion is a teeth bonded portion located at the teeth portion; a back yoke adherend portion located in the back yoke portion; Including, a laminated core.

5. The laminated core according to claim 1 or 2, The back yoke portion is Extending in a spiral shape around an axis and stacked in a stacking direction, Laminated core.

6. A method for manufacturing a cylindrical laminated core in which a plurality of core pieces are laminated in a thickness direction, the core pieces having a plate-shaped back yoke portion extending in a circumferential direction, a plurality of plate-shaped teeth portions extending radially inward from the back yoke portion, and a slit extending radially outward from an end face on an inner periphery between adjacent teeth portions in the back yoke portion in the circumferential direction, a punching process for forming a plate-shaped core piece forming portion by punching a steel plate, the plate-shaped core piece forming portion having a band-shaped back yoke forming portion, a plurality of teeth portions protruding from the back yoke forming portion in one width direction of the back yoke forming portion, and slits extending toward the other width direction between adjacent teeth portions in the back yoke forming portion; a bending process of bending the core piece forming portion formed in the punching process into an arc shape as viewed in the thickness direction by squeezing the gaps of the slits; a first application step of applying a first liquid agent, which is one of two types of liquid agents constituting a two-component adhesive that reacts and hardens upon contact, to a first application portion on one surface in the thickness direction of the core piece forming portion; a second coating step of coating a second coating portion on the other surface of the core piece forming portion in the thickness direction with the other second liquid agent of the two types of liquid agents; an adhesive lamination process in which the core piece forming portions bent into an arc shape by the bending process are laminated in a lamination direction to bring the first liquid agent applied to one surface in the thickness direction by the first application process into contact with the second liquid agent applied to the other surface in the thickness direction by the second application process; having Manufacturing method of laminated core.

7. 7. The method for manufacturing a laminated core according to claim 6, In the first application step, applying the first liquid agent to the first application portion of the core piece forming portion before the core piece forming portion is bent into an arc shape in the bending process; Manufacturing method of laminated core.

8. The method for manufacturing a laminated core according to claim 7, In the second coating step, applying the second liquid agent to the second application portion of the core piece forming portion bent into an arc shape by the bending process; Manufacturing method of laminated core.

9. 9. The method for manufacturing a laminated core according to claim 8, an area of ​​a second application portion to which the second liquid agent is applied in the second application step is larger than an area of ​​a first application portion to which the first liquid agent is applied in the first application step; In the second application step, the second liquid agent is applied to the second application portion in a film form. Manufacturing method of laminated core.

Images