Method of manufacturing multilayer core, device for manufacturing multilayer core, multilayer core and motor

Abstract

To provide a method of manufacturing a multilayer core capable of improving productivity of the multilayer core in which a plurality of core plates are connected in a direction of lamination by an adhesive.SOLUTION: A method of manufacturing a multilayer core 21 includes: a processing step of forming a core plate formation part to be a core plate; a contour punching step of forming the core plate by punching a contour of the core plate formation part; and a lamination step of laminating a plurality of core plates in a thickness direction. The processing step includes: a first adhesive coating step of coating one face of a steel plate in the thickness direction with a solution B1 that is one of two kinds of solutions constituting a two-liquid type adhesive; and a second adhesive coating step of coating the other face of the steel plate in the thickness direction with another solution B2 that is the other one of the two kinds of solutions. In the lamination step, in the core plates which are adjacent to each other in a direction of lamination in the plurality of core plates, one solution applied to one of the mutually opposed faces is brought into contact with the other solution applied to the other one of the opposed faces.SELECTED DRAWING: Figure 6

Description

[Technical Field]

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

[0002] A laminated core manufacturing apparatus in which an adhesive applicator is incorporated into a mold is known. One such manufacturing apparatus is disclosed in Patent Document 1, which includes a first mold configured to perform predetermined processing, excluding outline punching, on a strip-shaped metal plate that is sequentially fed out, a supply unit configured to supply adhesive to predetermined locations on the metal plate, a second mold that performs outline punching on the metal plate after the adhesive has been supplied by the supply unit, and a first drive mechanism configured to drive the first mold, the supply unit, and the second mold individually or integrally. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-129981 Summary of the Invention [Problem to be solved by the invention]

[0004] When connecting laminated cores in the stacking direction with adhesive, one possible method is to punch out the outer shapes of the core plates to be stacked in the laminated core from electromagnetic steel sheets and then apply adhesive to the core plates. In this case, the adhesive must be applied to the core plates in the punched-out state, which makes the adhesive application process less efficient. Furthermore, since the core plates are stacked after the adhesive has been applied, they must be aligned circumferentially and radially while being stacked, which makes the stacking process less efficient.

[0005] In response to this problem, a method has been proposed in which an adhesive application mechanism, like the manufacturing apparatus described above, is incorporated into a laminated core manufacturing apparatus. With such a manufacturing apparatus, the adhesive is applied to the electromagnetic steel sheets before the outer shape is punched out, resulting in good adhesive application workability. Furthermore, since multiple core sheets whose outer shapes have been punched out while still coated with adhesive can be stacked, the stacking workability is also good. However, with such a manufacturing apparatus, there is a possibility that the adhesive may adhere to the molds and jigs within the manufacturing apparatus, for example. This may result in the laminated core becoming clogged in the mold, resulting in reduced productivity.

[0006] Therefore, there is a demand for a method of manufacturing a laminated core that can improve productivity of a laminated core in which a plurality of core plates are connected in the stacking direction with an adhesive.

[0007] An object of the present invention is to provide a method for manufacturing a laminated core that can improve productivity of a laminated core in which a plurality of core plates are connected in the lamination direction with an adhesive. [Means for solving the problem]

[0008] A laminated core manufacturing method according to one embodiment of the present invention is a method for manufacturing a laminated core in which multiple core plates are stacked in the thickness direction. This laminated core manufacturing method includes a processing step of feeding a strip-shaped steel plate sequentially in the longitudinal direction and performing predetermined processing other than outline punching on multiple core plate forming regions of the steel plate to form core plate forming portions that will become the core plates, an outline punching step of punching the outlines of the core plate forming portions to form core plates, and a stacking step of stacking multiple core plates formed by the outline punching step in the thickness direction. The processing step includes a first adhesive application step of applying one of two liquid agents constituting a two-component adhesive to one surface of the steel plate in the thickness direction in the core plate forming region, and a second adhesive application step of applying the other of the two liquid agents to the other surface of the steel plate in the thickness direction in the core plate forming region. In the stacking process, when the plurality of core plates having one of the liquid agents applied to one surface in the thickness direction and the other liquid agent applied to the other surface in the thickness direction are stacked in the thickness direction, the one liquid agent applied to one of the opposing surfaces of adjacent core plates in the stacking direction is brought into contact with the other liquid agent applied to the other opposing surface.

[0009] A laminated core manufacturing apparatus according to one embodiment of the present invention is a manufacturing apparatus for manufacturing a laminated core in which a plurality of core plates are laminated in the thickness direction. This laminated core manufacturing device has a movable mold located on one side of the thickness direction of a strip-shaped steel plate and a fixed mold located on the other side of the thickness direction of the steel plate, and uses the movable mold and the fixed mold to process a core plate forming region located at a processing position in the steel plate that is fed progressively in the longitudinal direction, thereby forming a core plate forming portion that will become the core plate; a first adhesive application device that applies one of two types of liquid agents that make up a two-component adhesive to one thickness direction surface of the core plate forming region; a second adhesive application device that applies the other of the two types of liquid agents to the other thickness direction surface of the core plate forming region; and an outline punching mold that has a movable mold located on one side of the thickness direction of the steel plate and a fixed mold located on the other thickness direction of the steel plate, and uses the movable mold and the fixed mold to punch out the outline of the core plate forming portion located at an outline punching position in the thickness direction of the steel plate, thereby forming the core plate.

[0010] A laminated core according to one embodiment of the present invention is a laminated core having a plurality of core plates stacked in the thickness direction. Adjacent core plates in the stacking direction are bonded together with a cured two-component adhesive at a portion between their opposing faces in the stacking direction, and the outer edges of the core plates are separated from each other along the entire periphery as viewed in the stacking direction.

[0011] A motor according to one embodiment of the present invention is a motor including a stator having a cylindrical stator core extending along an axis, and a rotor having a cylindrical rotor core extending along the axis, positioned radially inward or outward of the stator and rotating about the axis, wherein at least one of the rotor core and the stator core has the laminated core described above. [Effects of the Invention]

[0012] According to one embodiment of the present invention, it is possible to improve the productivity of laminated cores in which a plurality of core plates are connected in the lamination direction with an adhesive. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a cross-sectional view showing a schematic configuration of a motor according to an embodiment. [Figure 2] FIG. 2 is a perspective view of the stator core. [Figure 3] FIG. 3 is a plan view of the core plate. [Figure 4] FIG. 4 is a cross-sectional view of the stator core. [Figure 5A] FIG. 5A is a diagram illustrating a method for bonding objects with a two-component adhesive. [Figure 5B] FIG. 5B is a diagram illustrating a method for bonding objects with a two-component adhesive. [Figure 6] FIG. 6 is a diagram showing a schematic configuration of a laminated core manufacturing apparatus according to an embodiment. [Figure 7] FIG. 7 is an example of a punched drawing of a steel plate. [Figure 8] FIG. 8 shows an example of a core plate punched out from a steel plate. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by 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 the components.

[0015] Furthermore, in the following description, the expressions "fix," "connect," and "attach" (hereinafter referred to as "fixing") include not only cases where members are directly fixed to each other, but also cases where members are fixed via other members. In other words, in the following description, the expression "fixing" includes both direct and indirect fixing of members to each other.

[0016] In the following description, the direction parallel to the central axis P of the shaft 4 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. In the following description, the thickness direction of the steel plate 80 being fed forward is referred to as the up-down direction.

[0017] (Embodiment) (Motor configuration) A motor 1 according to an exemplary embodiment of the present invention will be described with reference to Figures 1 to 4. As shown in Figure 1, the motor 1 has a rotor 2, a stator 3, a shaft 4, and a housing 5. The rotor 2 rotates around a central axis P relative to the stator 3. In this embodiment, the motor 1 is a so-called inner rotor type motor in which the rotor 2 is positioned inside the cylindrical stator 3 so as to be rotatable around the central axis P.

[0018] The rotor 2 includes a rotor core 21 and a magnet 22. The rotor 2 is located radially inward of the stator 3 and is rotatable relative to the stator 3 about a central axis P.

[0019] The rotor core 21 is columnar. The rotor core 21 has a plurality of core plates 25 stacked in the thickness direction. The rotor core 21 is an example of a laminated core in which a plurality of core plates 25 are stacked in the thickness direction. In other words, the rotor core 21 can be manufactured by a laminated core manufacturing apparatus 100 described below. The configuration of the rotor 2 is similar to that of a general rotor, so a detailed description of the configuration will be omitted.

[0020] The stator 3 is cylindrical. The rotor 2 is located radially inward of the stator 3. That is, the stator 3 is located radially opposite the rotor 2. The stator 3 is accommodated in a housing 5.

[0021] The stator 3 includes a stator core 31 and a stator coil 32. The stator core 31 has a plurality of core plates 35 stacked in the thickness direction. The stator coil 32 is wound around the stator core 31.

[0022] The stator core 31 is an example of a laminated core in which a plurality of core plates 35 are laminated in the thickness direction. That is, the stator core 31 can be manufactured by a laminated core manufacturing apparatus 100 described later. The configuration of the stator 31 is similar to that of a general stator, and therefore a detailed description of the configuration will be omitted.

[0023] (Laminated core) Next, a laminated core according to an exemplary embodiment of the present invention will be described. As described above, the rotor core 21 and the stator core 31 are examples of laminated cores. In the following, the case where the laminated core is the rotor core 21 will be described as an example, and a description of the case where the laminated core is the stator core 31 will be omitted.

[0024] As shown in FIGS. 2 to 4, rotor core 21 has a cylindrical shape extending along central axis P. That is, rotor core 21 has a shaft insertion hole 2a in the center when viewed in the axial direction. Shaft 4 passes through this shaft insertion hole 2a. Shaft 4 is fixed to rotor core 21 while passing through shaft insertion hole 2a. This allows rotor core 21 to rotate together with shaft 4.

[0025] The rotor core 21 has a plurality of magnet insertion holes 26 arranged in the circumferential direction surrounding the shaft insertion hole 2a. The magnets 22 are inserted into the magnet insertion holes 26.

[0026] As shown in Fig. 3, the core plates 25 that make up the rotor core 21 are disk-shaped electromagnetic steel plates. The core plates 25 have a central through hole 27 located in the center in a plan view, and a plurality of magnet through holes 28. The central through hole 27 forms the shaft insertion hole 2a when a plurality of core plates 25 are stacked in the thickness direction. The plurality of magnet through holes 28 form the magnet insertion holes 26 of the rotor core 21 when a plurality of core plates 25 are stacked in the thickness direction.

[0027] As shown in FIG. 4, adjacent core plates 25 in the stacking direction are bonded together by a cured product B of a two-component adhesive at a portion between surfaces 25a, 25b of the core plates facing each other in the stacking direction.

[0028] The cured product B of the two-component adhesive is obtained by the chemical reaction and curing of the first liquid agent B1 and the second liquid agent B2, which are the two types of liquid agents that make up the two-component adhesive. The cured product B of the two-component adhesive can bond metal materials together. In other words, the core plates 25 adjacent to each other in the stacking direction are bonded together by the cured product B.

[0029] The first liquid agent B1 and the second liquid agent B2 that constitute the two-component adhesive do not function as adhesives by themselves. The first liquid agent B1 and the second liquid agent B2 begin to harden, for example, when they are mixed together. For example, the first liquid agent B1 is a base agent, and the second liquid agent B2 is a curing agent. Alternatively, the first liquid agent B1 may be a curing agent, and the second liquid agent B2 may be a base agent.

[0030] In this embodiment, the two-component adhesive is a so-called honeymoon adhesive. FIGS. 5A and 5B are diagrams illustrating the honeymoon adhesive. The honeymoon adhesive can begin to harden simply by bringing the first liquid agent B1 and the second liquid agent B2 into contact with each other. In other words, the honeymoon adhesive does not require the first liquid agent B1 and the second liquid agent B2 to be mixed together in advance. Therefore, for example, the two objects Y1 and Y2 can be bonded by applying the first liquid agent B1 to one of the objects Y1 and Y2 and the second liquid agent B2 to the other object, and then bringing the coated surfaces of the two objects Y1 and Y2 into contact with each other. The honeymoon adhesive is, for example, an acrylic adhesive. The main component of the first liquid agent B1 is, for example, an acrylic resin. The main component of the second liquid agent B2 is, for example, an acrylic resin.

[0031] When objects Y1 and Y2 are stacked and bonded in the stacking direction using a honeymoon adhesive, for example, as shown in FIG. 5A, a first liquid agent B1 is applied to the surface Ya of object Y1 facing object Y2, and a second liquid agent B2 is applied to the surface Yb ​​of object Y2 facing object Y1. Next, objects Y1 and Y2 are stacked in the thickness direction. This brings the first liquid agent B1 and the second liquid agent B2 into contact, and as shown in FIG. 5B, the first liquid agent B1 and the second liquid agent B2 chemically react with each other. As a result, a cured product B that functions as an adhesive is formed between objects Y1 and Y2. Objects Y1 and Y2 are bonded by the cured product B.

[0032] 4, in this embodiment, the core plates 25 adjacent to each other in the stacking direction are not bonded to each other on the outer edge 25c side as viewed in the stacking direction. In other words, the core plates 25 adjacent to each other in the stacking direction are separated from each other over the entire periphery on the outer edge 25c side as viewed in the stacking direction.

[0033] (manufacturing equipment) Next, a laminated core manufacturing apparatus 100 according to an exemplary embodiment of the present invention will be described with reference to Figures 6 and 7. The manufacturing apparatus 100 is an apparatus for manufacturing a laminated core in which a plurality of core plates are stacked. In this embodiment, an example will be described in which the manufacturing apparatus 100 manufactures a rotor core 21 in which core plates 25 are stacked. Note that the manufacturing apparatus can also be configured to manufacture a stator core 31 in which a plurality of core plates 35 are stacked.

[0034] 6, the manufacturing apparatus 100 has a base 110, a processing die 120, an outline punching die 130, a first adhesive application device 140, a second adhesive application device 150, and a drive unit 170. The processing die 120, the outline punching die 130, the first adhesive application device 140, and the second adhesive application device 150 each perform predetermined processing on a plurality of core plate forming regions R of the strip-shaped steel plate 80 that is fed sequentially.

[0035] For example, the processing die 120 uses a first processing die 121 to punch a magnet through hole 28 in the core plate forming region R of the steel plate 80 located at a first processing position P1. The processing die 120 uses a second processing die 125 to punch a central through hole 27 in the core plate forming region R of the steel plate 80 located at a second processing position P2. The first adhesive application device 140 and the second adhesive application device 150 apply a first liquid agent B1 and a second liquid agent B2 to the core plate forming region R of the steel plate 80 located at an adhesive application position P3. The outline punching die 160 punches an outline in the core plate forming region R of the steel plate 80 located at an outline punching position P4.

[0036] FIG. 7 is an example of a punched-out diagram of a steel plate 80. For the sake of illustration, the punched portions of the steel plate 80 are shaded in FIG. 7. As shown in FIG. 7, the steel plate 80 has a plurality of core plate forming regions R. The steel plate 80 is transported in a forward feed direction X by a transport unit (not shown). Each core plate forming region R of the steel plate 80 is subjected to a predetermined processing.

[0037] More specifically, in this embodiment, the processing die 120 performs processing other than punching the outer shape on the core plate forming region R. Hereinafter, the portion of the steel plate 80 on which processing other than punching the outer shape is performed will be referred to as the core plate forming portion 82. The core plate forming portion 82 becomes the core plate 25 by punching out the outer shape.

[0038] The processing die 120 has a first processing die 121 that punches the magnet through holes 28 from the core plate forming region R, and a second processing die 125 that punches the central through hole 27 from the core plate forming region R. As shown in Fig. 6, the first processing die 121 and the second processing die 125 are arranged in this order from upstream X1 to downstream X2 in the forward feed direction X of the steel plate 80.

[0039] The first processing die 121 has a movable die 122 and a fixed die 123. The first processing die 121 punches out the magnet through-holes 28 in the core plate forming region R of the steel plate 80 located at the first processing position P1 using the movable die 122 and the fixed die 123.

[0040] The second processing die 125 has a movable die 126 and a fixed die 127. The second processing die 125 punches out a central through-hole 27 in the core plate forming region R of the steel plate 80 located at the second processing position P2, using the movable die 126 and the fixed die 127. This forms the core plate forming portion 82.

[0041] The outline punching die 130 has a movable die 131 and a fixed die 132. The outline punching die 130 punches out the outline of the core plate forming portion 82 located at the outline punching position P4, using the movable die 131 and the fixed die 132. In this way, the core plate 25 is formed.

[0042] In detail, the movable die 131 of the outline punching die 130 has a punch 1311 that moves toward the steel plate 80 located at the outline punching position P4. The fixed die 132 of the outline punching die 130 has an insertion hole 1321 that opens toward the steel plate 80 located at the outline punching position P4. As the punch 1311 moves toward the steel plate 80, the outline of the steel plate 80 is punched out to form a core plate 25. The core plate 25 formed by punching out the outline is inserted into the insertion hole 1321. The multiple core plates 25 punched out by the movable die 131 and the fixed die 132 are stacked inside the insertion hole 1321.

[0043] The movable dies 122, 126, and 131 are located above the steel plate 80 and are lined up in this order from upstream X1 to downstream X2 in the forward feed direction X. The fixed dies 123, 127, and 132 are located below the steel plate 80 and are lined up in this order from upstream X1 to downstream X2 in the forward feed direction X.

[0044] The first adhesive applicator 140 applies a first liquid agent B1, which is one of two types of liquid agents B1 and B2 that make up the two-component adhesive, to the upper surface 80a of the steel plate 80. Specifically, the first adhesive applicator 140 has a first adhesive holding unit 141, a first moving unit 142, and a first adhesive supply unit 143.

[0045] In this embodiment, the first adhesive holding unit 141 is disposed between the movable die 126 and the movable die 131 in the forward feed direction X. The first adhesive holding unit 141 is moved toward the upper surface 80a of the steel plate 80 by the first moving unit 142. The first adhesive holding unit 141 holds the first liquid agent B1 at its front end in the movement direction. As a result, the first liquid agent B1 held at the front end is applied to the first application area 84a on the upper surface 80a of the steel plate 80 located at the adhesive application position P3.

[0046] The first adhesive holding portion may be, for example, nozzle-shaped and may hold the first liquid agent B1 at the front end in the movement direction by surface tension. The first adhesive holding portion may be, for example, a sponge-like material made of a porous body.

[0047] The first adhesive supply unit 143 is configured to supply a first liquid agent B1 to the first adhesive holding unit 141. For example, the first liquid agent B1 is stored in the first adhesive supply unit 143. The first adhesive supply unit 143 sends the stored first liquid agent B1 to the first adhesive holding unit 141 using a pump. As a result, the first liquid agent B1 is held at the front end of the first adhesive holding unit 141.

[0048] The second adhesive applicator 150 applies the second liquid agent B2, which is the other of the two types of liquid agents B1 and B2 that make up the two-component adhesive, to the underside 80b of the steel plate 80. Specifically, the second adhesive applicator 150 has a second adhesive holding unit 151, a second moving unit 152, and a second adhesive supply unit 153.

[0049] In this embodiment, the second adhesive holding unit 151 is disposed between the fixed die 127 and the fixed die 132 in the forward feed direction X. The second adhesive holding unit 151 is moved toward the lower surface 80b of the steel plate 80 by the second moving unit 152. The second adhesive holding unit 151 holds the second liquid agent B2 at its front end in the movement direction. As a result, the second liquid agent B2 held at the front end is applied to the second application region 84b on the lower surface 80b of the steel plate 80 located at the adhesive application position P3.

[0050] The second adhesive holding portion may be, for example, nozzle-shaped and may hold the second liquid agent B2 at the front end in the movement direction by surface tension. The second adhesive holding portion may be, for example, a sponge-like material made of a porous body.

[0051] The second adhesive supply unit 153 is configured to supply the second liquid agent B2 to the second adhesive holding unit 151. For example, the second liquid agent B2 is stored in the second adhesive supply unit 153. The second adhesive supply unit 153 sends the stored second liquid agent B2 to the second adhesive holding unit 151 using a pump. As a result, the second liquid agent B2 is held at the front end of the second adhesive holding unit 151.

[0052] The base 110 supports the movable mold 122, the movable mold 126, the movable mold 131, the first moving unit 142, and the second moving unit 152 so that they can move in the vertical direction. The movable mold 122, the movable mold 126, the movable mold 131, the first moving unit 142, and the second moving unit 152 are driven by a driving unit 170. In this embodiment, the movable mold 122, the movable mold 126, the movable mold 131, the first moving unit 142, and the second moving unit 152 are driven integrally.

[0053] The driving unit 170 moves the movable mold 122, the movable mold 126, the movable mold 131, the first moving unit 142, and the second moving unit 152 toward the steel plate 80. The driving unit 170 simultaneously moves the movable mold 122, the movable mold 126, the movable mold 131, the first moving unit 142, and the second moving unit 152 in a direction approaching the steel plate 80.

[0054] The exemplary manufacturing apparatus 100 of the present invention having the above configuration is a manufacturing apparatus for manufacturing a rotor core 21 in which multiple core plates 25 are stacked in the thickness direction. The manufacturing apparatus 100 includes a processing die 120, a first adhesive applicator 140, a second adhesive applicator 150, and an outline punching die 130. The processing die 120 includes movable dies 122, 126 positioned on the upper surface of a strip-shaped steel plate 80 in the thickness direction and fixed dies 123, 127 positioned on the lower surface of the steel plate 80. The movable dies 122, 126 and fixed dies 123, 127 process a core plate forming region R located at processing positions P1, P2 of the steel plate 80, which is fed forward in the longitudinal direction, to form a core plate forming portion 82 that will become a core plate 25. The first adhesive applicator 140 applies a first liquid agent B1, one of two liquid agents constituting a two-component adhesive, to the upper surface 80a of the core plate forming region R. The second adhesive applicator 150 applies the other of the two types of liquid agents, the second liquid agent B2, to the lower surface 80b in the core plate forming region R. The outline punching die 130 has a movable die 131 located on the upper surface 80a side in the thickness direction of the steel plate 80, and a fixed die 132 located on the lower surface 80b side in the thickness direction of the steel plate 80, and the movable die 131 and the fixed die 132 punch out the outline of the core plate forming portion 82 located at outline punching position P4 in the thickness direction of the steel plate 80, thereby forming the core plate 25.

[0055] In the above-described manufacturing apparatus 100, two types of first and second liquid agents B1 and B2 that constitute a two-component adhesive are applied to the steel plate 80 before the outer shape of the core plate forming portion 82 is punched out. This makes it easier to apply the first and second liquid agents B1 and B2 to the core plate compared to when the first and second liquid agents are applied to the core plate by a manufacturing apparatus that applies the first and second liquid agents to the punched core plate.

[0056] Furthermore, in the above-described manufacturing apparatus 100, the first liquid agent B1 is applied to the upper surface 80a of the core plate 25 in a punched state, and the second liquid agent B2 is applied to the lower surface 80b. The first liquid agent B1 and the second liquid agent B2 do not function as adhesives by themselves. Therefore, even if the first liquid agent B1 and the second liquid agent B2 adhere to the manufacturing apparatus, they can be easily removed.

[0057] Therefore, it is possible to provide a manufacturing apparatus 100 that can improve the productivity of the rotor core 21 in which a plurality of core plates 25 are connected in the stacking direction with an adhesive.

[0058] The movable die 131 of the outline punching die 130 has a punch 1311 that moves toward the steel plate 80 located at the outline punching position P4. The fixed die 132 of the outline punching die 130 has an insertion hole 1321 that opens toward the steel plate 80 located at the outline punching position P4 and that holds the multiple core plates 25 punched by the movable die 131 and the fixed die 132 in a stacked state.

[0059] This allows multiple core plates 25 to be stacked inside the insertion hole 1321 while the outer shape of the core plates 25 is punched out using the outer shape punching die 130. One surface in the thickness direction of each of the punched multiple core plates 25 is coated with one of the two types of liquid agents, the first liquid agent B1, and the other surface in the thickness direction is coated with the other of the two types of liquid agents, the second liquid agent B2. Therefore, by stacking multiple core plates 25 inside the insertion hole 1321, the core plates 25 adjacent to each other in the stacking direction can be bonded to each other. This allows for improved productivity of the rotor core 21.

[0060] In this embodiment, the first adhesive application device 140 has a first adhesive holding unit 141 that holds a first liquid agent B1 and a first moving unit 142 that moves the first adhesive holding unit 141 toward the upper surface 80a of the steel plate 80. The second adhesive application device 150 has a second adhesive holding unit 151 that holds a second liquid agent B2 and a second moving unit 152 that moves the second adhesive holding unit 151 toward the lower surface 80b of the steel plate 80. The first adhesive holding unit 141 holds the first liquid agent B1 at its front end in the movement direction. The first moving unit 142 moves the first adhesive holding unit 141 toward the upper surface of the steel plate 80, thereby applying the first liquid agent B1 at its front end to the upper surface 80a in the thickness direction of the steel plate 80. The second adhesive holding unit 151 holds the second liquid agent B2 at its front end in the movement direction. The second moving section 152 applies the second liquid agent B2 at the front end to the lower surface 80b of the steel plate 80 by moving the second adhesive holding section 151 toward the lower surface 80b of the steel plate 80.

[0061] As described above, in this embodiment, the first adhesive holding unit 141 approaches the steel plate 80 and applies the first liquid agent B1 held at its front end to a first application area 84a of the steel plate 80. The second adhesive holding unit 151 approaches the steel plate 80 and applies the second liquid agent B2 held at its front end to a second application area 84b of the steel plate 80. This makes it possible to apply the first liquid agent B1 and the second liquid agent B2 to the adhesive application area more efficiently and accurately than with application methods in which liquid agents are ejected toward the adhesive application area from a position away from the adhesive application area.

[0062] Furthermore, in this embodiment, the second adhesive holding section 151 of the second adhesive application device 150 is located upstream X1 of the outline punching die 130 in the forward feed direction X of the steel plate 80, and is aligned in the longitudinal direction of the steel plate 80 with respect to the fixed die 132 of the outline punching die 130. The first adhesive holding section 141 of the first adhesive application device 140 is located upstream X1 of the outline punching die 130 in the forward feed direction X, and is aligned in the longitudinal direction with respect to the movable die 131 of the outline punching die 130.

[0063] This makes it possible to provide an apparatus that applies the second liquid agent B2 to the lower surface 80b in the thickness direction of the steel plate 80 after a predetermined processing has been performed by the processing die 120 and before the outer shape has been punched out. This makes it possible to prevent the second liquid agent B2 from adhering to the fixed dies 123, 127 of the processing die 120. Therefore, it is possible to suppress a decrease in the workability of the processing operation using the processing die 120.

[0064] In this embodiment, the first adhesive holding unit 141 of the first adhesive application device 140 is located downstream X2 of the processing die 120 in the forward feed direction X of the steel plate 80, and is aligned in the longitudinal direction with the movable dies 122, 126 of the processing die 120 and the movable die 131 of the outline punching die 130. The second adhesive holding unit 151 of the second adhesive application device 150 is located downstream X2 of the processing die 120 in the forward feed direction X, and is aligned in the longitudinal direction with the fixed dies 123, 127 of the processing die 120 and the fixed die 132 of the outline punching die 130, and is also aligned in a direction perpendicular to the longitudinal direction with the first adhesive holding unit 141 of the first adhesive application device 140.

[0065] This allows the first adhesive holding portion 141 to apply the first liquid agent B1 and the second adhesive holding portion 151 to apply the second liquid agent B2 simultaneously, thereby improving the manufacturing efficiency of the rotor core 21. This also allows the productivity of the rotor core 21 to be improved.

[0066] Furthermore, it is possible to provide a more compact manufacturing apparatus 100 than when the first adhesive holding unit and the second adhesive holding unit are arranged at different positions in the forward feed direction of the steel plate.

[0067] In addition, this embodiment further includes a drive unit 170 that simultaneously moves the movable dies 122, 126 of the processing die 120, the movable die 131 of the outline punching die 130, the first moving unit 142 of the first adhesive application device 140, and the second moving unit 152 of the second adhesive application device 150 in a direction approaching the steel plate 80.

[0068] This allows the punching process using the die and the adhesive application process to be synchronized, thereby enabling efficient production of the rotor core 21.

[0069] In this embodiment, the first adhesive application device 140 has a first adhesive supply unit 143 that supplies a first liquid agent B1 to the first adhesive holding unit 141. The second adhesive application device 150 has a second adhesive supply unit 153 that supplies a second liquid agent B2 to the second adhesive holding unit 151.

[0070] This makes it possible to realize a configuration in which adhesive can be continuously fed to the first adhesive holding portion 141 and the second adhesive holding portion 151.

[0071] (Laminated core manufacturing method) Next, a laminated core manufacturing method according to an exemplary embodiment of the present invention will be described with reference to Figures 6 to 8. The laminated core manufacturing method is a method for manufacturing a laminated core in which a plurality of core plates are stacked in the thickness direction. In this embodiment, a method for manufacturing a rotor core 21 in which a plurality of core plates 25 are stacked will be described. A description of a method for manufacturing a stator core 31 in which a plurality of core plates 35 are stacked will be omitted.

[0072] The laminated core manufacturing method includes a processing step, an outer shape punching step, and a laminating step.

[0073] The processing step is a step of feeding the strip-shaped steel plate 80 forward in the longitudinal direction to form core plate forming portions 82 in multiple core plate forming regions R. The core plate forming portions 82 are portions that will become the core plates 25 of the rotor core 21. In the processing step, predetermined processing other than outline punching is performed on each of the multiple core plate forming regions R of the steel plate 80.

[0074] In this embodiment, the processing process includes a punching process for punching out the magnet through hole 28 and the central through hole 27 from the core plate forming region R, a first adhesive application process for applying a first liquid agent B1 to the upper surface 80a of the steel plate 80 in the core plate forming region R, and a second adhesive application process for applying a second liquid agent B2 to the lower surface 80b of the steel plate 80 in the core plate forming region R.

[0075] In this embodiment, the punching process is performed using, for example, a processing die 120 of a manufacturing apparatus 100, as shown in Fig. 6. A movable die 122 and a fixed die 123 of a first processing die 121 of the processing die 120 punch out the magnet through holes 28 from the core plate forming region R. The first processing position P1 in Fig. 7 shows the core plate forming region R in a state where the magnet through holes 28 have been punched out.

[0076] Next, the steel plate 80 is conveyed in the forward feed direction X, and a central through-hole 27 is punched in the core plate forming region R where the magnet through-holes 28 have been punched. This step is carried out, for example, by the movable die 126 and fixed die 127 of the second processing die 125 of the processing die 120 of the manufacturing apparatus 100, as shown in Fig. 6. The second processing position P2 in Fig. 7 shows the core plate forming region R in a state where the central through-hole 27 has been punched.

[0077] The first adhesive application step is performed, for example, using a first adhesive application device 140 of the manufacturing apparatus 100, as shown in Fig. 6. The second adhesive application step is performed, for example, using a second adhesive application device 150 of the manufacturing apparatus 100, as shown in Fig. 6. In this embodiment, the first adhesive application step and the second adhesive application step are performed after the punching step. That is, the first adhesive application step and the second adhesive application step are performed as the final steps in the processing step.

[0078] In the first adhesive application step, the first adhesive holding part 141 holding the first liquid agent B1 is moved toward the upper surface 80a of the steel plate 80, so that the first liquid agent B1 held by the first adhesive holding part 141 at the front end in the movement direction is applied to a first application area 84a on the upper surface 80a. In the second adhesive application step, the second adhesive holding part 151 holding the second liquid agent B2 is moved toward the lower surface 80b of the steel plate 80, so that the second liquid agent B2 held by the second adhesive holding part 151 at the front end in the movement direction is applied to a second application area 84b on the lower surface 80b.

[0079] As described above, in this embodiment, the first adhesive holding unit 141 approaches the steel plate 80 and applies the first liquid agent B1 held at its front end to a first application area 84a of the steel plate 80. The second adhesive holding unit 151 approaches the steel plate 80 and applies the second liquid agent B2 held at its front end to a second application area 84b of the steel plate 80. The core plate forming region R in a state where the first liquid agent B1 and the second liquid agent B2 have been applied is shown at the adhesive application position P3 in Figure 7.

[0080] This allows the first liquid agent B1 and the second liquid agent B2 to be applied to the adhesive application area more efficiently and accurately than in an application method in which the liquid agent is ejected or sprayed toward the adhesive application area from a position away from the adhesive application area, thereby improving the productivity of the rotor core 21.

[0081] In this embodiment, the first application area 84a on the upper surface 80a to which the first adhesive holding portion 141 applies the first liquid agent B1 and the second application area 84b on the lower surface 80b to which the second adhesive holding portion 151 applies the second liquid agent B2 overlap in the thickness direction of the steel plate 80.

[0082] This allows the positions where the first liquid agent B1 is applied and the positions where the second liquid agent B2 is applied to be aligned in the thickness direction of the core plate 25. Therefore, when multiple core plates 25 are stacked, the first liquid agent B1 and the second liquid agent B2 can be brought into contact with each other more reliably. This improves the productivity of the rotor core 21.

[0083] In this embodiment, the first adhesive application step and the second adhesive application step are performed at the end of the processing step. In this way, since the second liquid agent B2 is applied to the lower surface 80b of the steel plate 80 at the end of the processing step, it is possible to prevent the second liquid agent B2 from adhering to the fixed molds 123, 127 of the processing mold 120 used in the processing step. Therefore, it is possible to prevent a decrease in the workability of the processing work in the processing step.

[0084] Furthermore, the first adhesive application step and the second adhesive application step are performed simultaneously. This improves manufacturing efficiency compared to when the first adhesive application step and the second adhesive application step are performed separately. This improves the productivity of the rotor core 21.

[0085] The outline punching step punches out the outline of the core plate forming section 82, whose upper surface 80a is coated with the first liquid agent B1 and whose lower surface 80b is coated with the second liquid agent B2. As shown in FIG. 6, the outline punching step is carried out using, for example, an outline punching die 130 of a manufacturing apparatus 100. The outline of the core plate forming section 82 is punched out using a movable die 131 and a fixed die 132 of the outline punching die 130. This results in a core plate 25 having two types of liquid agents applied to both surfaces in the thickness direction. FIG. 8 shows the core plate 25 after the outline has been punched out.

[0086] In the lamination process, multiple core plates 25 obtained in the outline punching process are stacked. Each core plate 25 has a first liquid agent B1 applied to one surface in the thickness direction and a second liquid agent B2 applied to the other surface in the thickness direction. Therefore, by stacking multiple core plates 25 punched in the outline punching process, the first liquid agent B1 applied to one of the opposing surfaces of adjacent core plates 25 in the stacking direction can be brought into contact with the second liquid agent B2 applied to the other opposing surface.

[0087] The first liquid agent B1 and the second liquid agent B2 come into contact with each other and harden to function as an adhesive, thereby obtaining a rotor core 21 in which a portion of the surfaces of the core plates 25 stacked in the thickness direction that face each other in the stacking direction is bonded by the hardened two-component adhesive.

[0088] The rotor core 21 is coated with the first liquid agent B1 and the second liquid agent B2 before the outer shape punching process. Therefore, the first liquid agent B1 and the second liquid agent B2 are not coated on the portion that comes into contact with the outer shape punching die 130 that punches out the outer shape. The portion that comes into contact with the outer shape punching die 130 is the outer edge 25c side when viewed in the thickness direction of the core plate 25. Therefore, the first liquid agent B1 and the second liquid agent B2 are not coated on the outer edge 25c side of the core plate 25 when viewed in the stacking direction. Therefore, in the rotor core 21 manufactured by the manufacturing apparatus 100, adjacent core plates 25 in the stacking direction are separated from each other along the entire periphery on the outer edge 25c side when viewed in the stacking direction.

[0089] That is, the rotor core 21 manufactured by the above-described manufacturing method is a rotor core 21 having a plurality of core plates 25 stacked in the thickness direction. In the rotor core 21, the core plates 25 adjacent to each other in the stacking direction are bonded together by a hardened two-component adhesive at a portion between their faces facing each other in the stacking direction, and the outer edges 25c of the core plates 25 are separated from each other along the entire circumference when viewed in the stacking direction.

[0090] In the rotor core 21 described above, the cured two-component adhesive is not present around the entire periphery of the outer edge 25c of the core plate 25. This core plate 25 is manufactured by applying the liquid agent constituting the two-component adhesive and then punching out the outer shape with a punch that contacts the entire outer edge 25c. That is, before the outer shape is punched out, the core plate 25 is manufactured by applying a first liquid agent B1, one of the two liquid agents constituting the two-component adhesive, to one thickness surface of the steel plate 80, and applying a second liquid agent B2, the other of the two liquid agents, to the other thickness surface. Therefore, this manufacturing method is more efficient than a manufacturing method in which the liquid agent is applied after punching out the core plate. This allows for a rotor core 21 with improved productivity.

[0091] The motor 1 is a motor having a stator 3 having a cylindrical stator core 31 extending along an axis, and a rotor 2 having a cylindrical rotor core 21 extending along the axis, positioned radially inward or outward of the stator 3 and rotating about the axis. In the rotor core 21, core plates 25 adjacent in the stacking direction are bonded together by a hardened two-component adhesive at a portion between their faces facing each other in the stacking direction, and their outer edges 25c are separated from each other along the entire circumference when viewed in the stacking direction.

[0092] The stator core 31 may be manufactured by the above-described manufacturing method, thereby obtaining the motor 1 in which at least one of the rotor core 21 and the stator core 31 is manufactured by a manufacturing method with improved productivity.

[0093] The exemplary manufacturing method of rotor core 21 of the present invention described above is a manufacturing method of rotor core 21 in which multiple core plates 25 are stacked in the thickness direction. The manufacturing method of rotor core 21 includes a processing step of progressively feeding strip-shaped steel plate 80 in the longitudinal direction and performing predetermined processing other than outline punching on each of multiple core plate forming regions R of steel plate 80 to form core plate forming portions 82 that will become core plates 25, an outline punching step of punching out the outline of core plate forming portion 82 to form core plates 25, and a stacking step of stacking multiple core plates 25 formed in the outline punching step in the thickness direction.

[0094] The processing process includes a first adhesive application process in which a first liquid agent B1, one of two types of liquid agents constituting a two-component adhesive, is applied to the upper surface 80a of the steel plate 80 in the core plate forming region R, and a second adhesive application process in which the other of the two types of liquid agents, a second liquid agent B2, is applied to the lower surface 80b of the steel plate 80 in the core plate forming region R.

[0095] In the stacking process, when a plurality of core plates 25 having a first liquid agent B1 applied to their upper surfaces 80a and a second liquid agent B2 applied to their lower surfaces 80b are stacked in the thickness direction, the first liquid agent B1 applied to one of the opposing surfaces of adjacent core plates 25 in the stacking direction is brought into contact with the second liquid agent B2 applied to the other opposing surface.

[0096] In this way, in the above-described manufacturing method, the first liquid agent B1 and the second liquid agent B2 are applied to the core plate forming portion 82 before the outer shape is punched out. This improves the workability of the liquid agent application process compared to when the liquid agents are applied to a core plate whose outer shape has already been punched out.

[0097] In the above-described method, the first liquid agent B1 is applied to one surface of the core plate 25, and the second liquid agent B2 is applied to the other surface. The first liquid agent B1 and the second liquid agent B2 do not function as adhesives by themselves. Therefore, even if the first liquid agent B1 and the second liquid agent B2 adhere to other articles, they can be easily removed.

[0098] Therefore, the productivity of the rotor core 21 in which the plurality of core plates 25 are connected in the stacking direction by adhesive can be improved.

[0099] (Other embodiments) Although the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiments, and it is possible to appropriately modify the above-described embodiments within the scope of the spirit of the present invention.

[0100] In the above embodiment, the manufacturing apparatus 100 for the rotor core 21 and the manufacturing method for the rotor core 21 have been described. However, the manufacturing apparatus may also manufacture a stator core. Also, a stator core may be manufactured by the above-described manufacturing method.

[0101] The manufacturing apparatus may also manufacture both rotor cores and stator cores. That is, the manufacturing apparatus may punch core plates to be laminated into the rotor core from a strip-shaped steel plate fed progressively from the upstream side to the downstream side, and then punch core plates to be laminated into the stator core. In this case, the manufacturing apparatus may apply the first liquid agent and the second liquid agent to the upper and lower surfaces of the steel plate before punching the outer shape of the core plate of the rotor core, and may apply the first liquid agent and the second liquid agent to the upper and lower surfaces of the steel plate before punching the outer shape of the core plate of the stator core.

[0102] In the embodiment, the first adhesive applicator 140 applies the first liquid agent B1 to the upper surface 80a before punching out the outer shape of the core plate forming portion 82. However, the first adhesive applicator may apply the first liquid agent to the upper surface at the same time as punching out the outer shape of the core plate forming portion. In other words, the first adhesive holder of the first adhesive applicator may be located within the movable die of the outer shape punching mold.

[0103] In the above embodiment, the first adhesive holder 141 of the first adhesive application device 140 is disposed between the movable die 126 of the second processing die 125 and the movable die 131 of the outer shape punching die 130. The second adhesive holder 151 of the second adhesive application device 150 is disposed between the fixed die 127 of the second processing die 125 and the fixed die 132 of the outer shape punching die 130. However, the first adhesive holder may be disposed upstream of the second processing die or upstream of the first processing die, as long as it is disposed upstream of the movable die of the outer shape punching die in the forward feed direction. The second adhesive holder may be disposed upstream of the second processing die or upstream of the first processing die, as long as it is disposed upstream of the fixed die of the outer shape punching die in the forward feed direction.

[0104] In the above embodiment, the first adhesive application step and the second adhesive application step are performed simultaneously, but the first adhesive application step and the second adhesive application step may be performed separately.

[0105] In the above embodiment, the driving unit 170 simultaneously moves the movable dies 122, 126, 131, the first moving unit 142, and the second moving unit 152 in a direction approaching the steel plate 80. However, the driving unit may also move the plurality of movable dies, the first moving units, and the second moving units individually.

[0106] (Configuration example) The present technology can also be configured as follows.

[0107] (1) The laminated core manufacturing method is a method for manufacturing a laminated core in which a plurality of core plates are laminated in the thickness direction. The laminated core manufacturing method includes a processing step of feeding a strip-shaped steel plate sequentially in the longitudinal direction and performing predetermined processing other than outline punching on each of a plurality of core plate forming regions of the steel plate to form core plate forming portions that will become the core plates, an outline punching step of punching out the outlines of the core plate forming portions to form core plates, and a lamination step of stacking a plurality of the core plates formed by the outline punching step in the thickness direction. The processing step includes a first adhesive application step of applying one of two types of liquid agents that constitute a two-component adhesive to one surface of the steel plate in the thickness direction in the core plate forming region, and a second adhesive application step of applying the other of the two types of liquid agents to the other surface of the steel plate in the thickness direction in the core plate forming region. In the laminating step, when the plurality of core plates, each having one surface in the thickness direction coated with the one liquid agent and the other surface in the thickness direction coated with the other liquid agent, are laminated in the thickness direction, the one liquid agent applied to one of the opposing surfaces of adjacent core plates in the laminating direction is brought into contact with the other liquid agent applied to the other opposing surface.

[0108] (2) In the laminated core manufacturing method described in (1), the second adhesive application step is carried out at the end of the processing step.

[0109] (3) In the laminated core manufacturing method described in (1) or (2), the first adhesive application step and the second adhesive application step are carried out simultaneously in the processing step.

[0110] (4) In the laminated core manufacturing method described in (1) to (3), in the first adhesive application step, a first adhesive holding unit holding one of the liquid agents is moved toward one surface of the steel plate in the thickness direction, thereby applying the one liquid agent held by the first adhesive holding unit at a front end in the movement direction to an adhesive application area on the one surface. In the second adhesive application step, a second adhesive holding unit holding the other liquid agent is moved toward the other surface of the steel plate in the thickness direction, thereby applying the other liquid agent held by the second adhesive holding unit at a front end in the movement direction to an adhesive application area on the other surface.

[0111] (5) In the laminated core manufacturing method described in (4), the adhesive application area on one surface in the thickness direction to which the first adhesive holding portion applies one of the liquid agents and the adhesive application area on the other surface in the thickness direction to which the second adhesive holding portion applies the other liquid agent overlap in the thickness direction of the steel plate.

[0112] (6) The laminated core manufacturing device is a manufacturing device for manufacturing a laminated core in which a plurality of core plates are laminated in the thickness direction. The laminated core manufacturing device has a movable mold located on one side of the thickness direction of the strip-shaped steel plate and a fixed mold located on the other side of the thickness direction of the steel plate, and uses the movable mold and the fixed mold to process a core plate forming region located at a processing position in the steel plate that is fed progressively in the longitudinal direction, thereby forming a core plate forming portion that will become the core plate; a first adhesive application device that applies one of two types of liquid agents that make up a two-component adhesive to one thickness direction surface of the core plate forming region; and a contour punching mold that has a movable mold located on one side of the thickness direction of the steel plate and a fixed mold located on the other thickness direction of the steel plate, and uses the movable mold and the fixed mold to punch out the contour of the core plate forming portion located at a contour punching position in the thickness direction of the steel plate, thereby forming the core plate.

[0113] (7) In the laminated core manufacturing device described in (6), the movable die of the outline punching die has a punch that moves toward the steel plate located at the outline punching position, and the fixed die of the outline punching die has an insertion hole that opens toward the steel plate located at the outline punching position and holds the multiple core plates punched by the movable die and the fixed die in a stacked state.

[0114] (8) In the laminated core manufacturing apparatus described in (6) or (7), the first adhesive application device has a first adhesive holding unit that holds the one liquid agent and a first moving unit that moves the first adhesive holding unit toward one surface of the steel plate in the thickness direction. The second adhesive application device has a second adhesive holding unit that holds the other liquid agent and a second moving unit that moves the second adhesive holding unit toward the other surface of the steel plate in the thickness direction. The first adhesive holding unit holds the one liquid agent at a front end in the moving direction. The first moving unit moves the first adhesive holding unit toward one surface of the steel plate in the thickness direction, thereby applying the one liquid agent at the front end to one surface of the steel plate in the thickness direction. The second adhesive holding unit holds the other liquid agent at a front end in the moving direction. The second moving unit applies the other liquid agent at the front end to the other surface of the steel plate in the thickness direction by moving the second adhesive holding unit toward the other surface of the steel plate in the thickness direction.

[0115] In the manufacturing method of a laminated core described in (9) and (8), the second adhesive holding portion of the second adhesive application device is located upstream of the outline punching die in the forward feed direction of the steel plate and aligned with the fixed die of the outline punching die in the longitudinal direction of the steel plate. The first adhesive holding portion of the first adhesive application device is located upstream of the outline punching die in the forward feed direction and aligned with the movable die of the outline punching die in the longitudinal direction, or is located inside the movable die of the outline punching die.

[0116] (10) In the manufacturing method of a laminated core described in (9), the first adhesive holder of the first adhesive application device is located downstream of the processing die in the forward feed direction of the steel plate and aligned in the longitudinal direction with the movable die of the processing die and the movable die of the outline punching die. The second adhesive holder of the second adhesive application device is located downstream of the processing die in the forward feed direction and aligned in the longitudinal direction with the fixed die of the processing die and the fixed die of the outline punching die, and aligned in a direction perpendicular to the longitudinal direction with the first adhesive holder of the first adhesive application device.

[0117] (11) The laminated core manufacturing apparatus described in (10) further includes a drive unit that simultaneously moves the movable die of the processing die, the movable die of the outer shape punching die, the first moving unit of the first adhesive application device, and the second moving unit of the second adhesive application device in a direction approaching the steel plate.

[0118] (12) In the laminated core manufacturing apparatus described in any one of (8) to (11), the first adhesive application device has a first adhesive supply unit that supplies one of the liquid agents to the first adhesive holding unit, and the second adhesive application device has a second adhesive supply unit that supplies the other of the liquid agents to the second adhesive holding unit.

[0119] (13) The laminated core is a laminated core having a plurality of core plates laminated in the thickness direction. In the laminated core, adjacent core plates in the stacking direction are bonded together by a cured two-component adhesive at a portion between their opposing faces in the stacking direction, and the outer edges of the core plates are separated from each other along the entire periphery as viewed in the stacking direction.

[0120] (14) A motor includes a stator having a cylindrical stator core extending along an axis, and a rotor having a cylindrical rotor core extending along the axis, positioned radially inward or outward of the stator, and rotating about the axis, wherein at least one of the rotor core and the stator core has the laminated core described in (13). [Industrial Applicability]

[0121] The present invention can be used to manufacture a laminated core in which the lamination directions are joined together by an adhesive. [Explanation of symbols]

[0122] 1 motor 2 rotors 2a Shaft insertion hole 21 Rotor core (laminated core) 22 Magnet 25 core board 25a, 25b side 25c outer edge 26 Magnet insertion hole 27 Central through hole 28 Magnet through hole 3 Stator 31 Stator core (laminated core) 32 stator coil 35 Core plate 4 shafts 5. Housing 80 steel plate 80a Top surface (one side in the thickness direction) 80b bottom surface (other surface in thickness direction) 82 Core plate forming section 84a First application area (adhesive application area) 84b Second application area (adhesive application area) 100 Manufacturing equipment 110 base 120 Processing mold 121 First processing mold 122 Movable type 123 Fixed type 125 Second processing mold 126 Movable type 127 Fixed type 130 Outer shape punching die 131 Movable type 1311 Punch 132 Fixed type 1321 Insertion hole 140 First adhesive application device 141 first adhesive holding portion 142 First Mobile Section 143 First adhesive supply unit 150 Second adhesive application device 151 second adhesive holding portion 152 Second Mobile Section 153 Second adhesive supply unit 170 Drive unit B1 First liquid (one of the two liquids that make up a two-component adhesive) B2 Second liquid (the other of the two liquids that make up the two-component adhesive) P1 1st machining position P2 2nd machining position P3 Adhesive application position P4 Outer shape punching position R Core plate forming region X forward direction X1 upstream X2 downstream

Claims

1. A method for manufacturing a laminated core in which a plurality of core plates are laminated in the thickness direction, comprising: a processing step of feeding a strip-shaped steel plate progressively in a longitudinal direction and performing predetermined processing other than outer shape punching on each of a plurality of core plate forming regions of the steel plate to form core plate forming portions that will become the core plates; an outer shape punching step of punching out the outer shape of the core plate forming portion to form a core plate; a lamination step of laminating a plurality of the core plates formed in the outer shape punching step in a thickness direction, The processing step includes: a first adhesive application step of applying one of two types of liquid agents constituting a two-component adhesive to one surface of the steel plate in the thickness direction in the core plate forming region; a second adhesive application step of applying the other of the two types of liquid agents to the other surface in the thickness direction of the steel plate in the core plate forming region; Including, In the lamination step, When stacking the plurality of core plates in the thickness direction, each having one surface in the thickness direction coated with the one liquid agent and the other surface in the thickness direction coated with the other liquid agent, the one liquid agent applied to one of the opposing surfaces of adjacent core plates in the stacking direction is brought into contact with the other liquid agent applied to the other opposing surface. Laminated core manufacturing method.

2. 2. The laminated core manufacturing method according to claim 1, The second adhesive application step is carried out at the end of the processing step. Laminated core manufacturing method.

3. 2. The laminated core manufacturing method according to claim 1, In the processing step, the first adhesive application step and the second adhesive application step are carried out simultaneously. Laminated core manufacturing method.

4. In the laminated core manufacturing method according to any one of claims 1 to 3, In the first adhesive application step, a first adhesive holding unit that holds one of the liquid agents is moved toward one surface of the steel plate in the thickness direction, thereby applying the one of the liquid agents held by the first adhesive holding unit at a front end in the movement direction to an adhesive application area on the one surface; In the second adhesive application step, a second adhesive holding portion that holds the other liquid agent is moved toward the other surface in the thickness direction of the steel plate, thereby applying the other liquid agent held by the second adhesive holding portion at a front end portion in the movement direction to an adhesive application area on the other surface; Laminated core manufacturing method.

5. 5. The laminated core manufacturing method according to claim 4, The adhesive application area on one surface in the thickness direction to which the first adhesive holding portion applies one of the liquid agents and the adhesive application area on the other surface in the thickness direction to which the second adhesive holding portion applies the other liquid agent overlap in the thickness direction of the steel plate. Laminated core manufacturing method.

6. A manufacturing apparatus for manufacturing a laminated core in which a plurality of core plates are laminated in the thickness direction, a processing die having a movable die positioned on one side of a strip-shaped steel plate in the thickness direction and a fixed die positioned on the other side of the steel plate in the thickness direction, the processing die forming a core plate forming portion that becomes the core plate by processing a core plate forming region positioned at a processing position in the steel plate that is fed progressively in the longitudinal direction using the movable die and the fixed die; a first adhesive applying device that applies one of two types of liquid agents constituting a two-component adhesive to one surface of the core plate forming region in the thickness direction; a second adhesive applying device that applies the other of the two types of liquid agents to the other surface in the thickness direction of the core plate forming region; an outline punching die having a movable die positioned on one side of the steel plate in the thickness direction and a fixed die positioned on the other side of the steel plate in the thickness direction, the movable die and the fixed die being used to punch out the outline of the core plate forming portion positioned at an outline punching position in the thickness direction of the steel plate, thereby forming the core plate; having Laminated core manufacturing equipment.

7. 7. The laminated core manufacturing apparatus according to claim 6, The movable die of the outer shape punching die is a punch that moves toward the steel plate located at the outer shape punching position, The fixed die of the outer shape punching die is an insertion hole that opens toward the steel plate located at the outer shape punching position and holds the plurality of core plates punched by the movable die and the fixed die in a stacked state; Laminated core manufacturing equipment.

8. The laminated core manufacturing apparatus according to claim 6 or 7, The first adhesive application device is a first adhesive holding portion that holds the one of the liquid agents; a first moving unit that moves the first adhesive holding unit toward one surface of the steel plate in a thickness direction; and The second adhesive application device is a second adhesive holding portion that holds the other liquid agent; a second moving unit that moves the second adhesive holding unit toward the other surface of the steel plate in the thickness direction; and The first adhesive holding portion is The one liquid agent is held at a front end portion in a moving direction, The first moving unit is The first adhesive holding portion is moved toward one surface of the steel plate in the thickness direction, thereby applying the one liquid agent at the front end portion to one surface of the steel plate in the thickness direction; The second adhesive holding portion is The other liquid agent is held at a front end portion in a moving direction, The second moving unit is The second adhesive holding portion is moved toward the other surface of the steel plate in the thickness direction, thereby applying the other liquid agent at the front end portion to the other surface of the steel plate in the thickness direction. Laminated core manufacturing equipment.

9. 9. The method for manufacturing a laminated core according to claim 8, The second adhesive holder of the second adhesive application device is The die is positioned upstream of the die for punching the outer shape in the forward feed direction of the steel plate and aligned with the fixed die of the die for punching the outer shape in the longitudinal direction of the steel plate, The first adhesive holding unit of the first adhesive application device is The die is positioned upstream of the die for punching the outer shape in the forward feed direction, and is aligned with the movable die of the die for punching the outer shape in the longitudinal direction, or is positioned within the movable die of the die for punching the outer shape. Laminated core manufacturing equipment.

10. 10. The method for manufacturing a laminated core according to claim 9, The first adhesive holding unit of the first adhesive application device is The die is positioned downstream of the processing die in the forward feed direction of the steel plate, and is aligned in the longitudinal direction with the movable die of the processing die and the movable die of the outer shape punching die, The second adhesive holder of the second adhesive application device is the die is positioned downstream of the processing die in the forward feed direction, aligned in the longitudinal direction with the fixed die of the processing die and the fixed die of the outer shape punching die, and aligned in a direction perpendicular to the longitudinal direction with the first adhesive holding portion of the first adhesive application device; Laminated core manufacturing equipment.

11. The laminated core manufacturing apparatus according to claim 10, a driving unit that simultaneously moves the movable die of the processing die, the movable die of the outline punching die, the first moving unit of the first adhesive application device, and the second moving unit of the second adhesive application device in a direction approaching the steel plate, Laminated core manufacturing equipment.

12. 9. The laminated core manufacturing apparatus according to claim 8, The first adhesive application device is a first adhesive supply unit that supplies the one liquid agent to the first adhesive holding unit; The second adhesive application device is a second adhesive supply unit that supplies the other liquid agent to the second adhesive holding unit; Laminated core manufacturing equipment.

13. A laminated core having a plurality of core plates laminated in the thickness direction, Adjacent core plates in the stacking direction are a part of the surfaces facing each other in the stacking direction is bonded with a cured product of a two-component adhesive, The outer edge side is separated over the entire periphery when viewed in the stacking direction. Laminated core.

14. a stator having a cylindrical stator core extending along an axis; a rotor having a cylindrical rotor core extending along the axis, the rotor being positioned radially inward or outward relative to the stator and rotating about the axis; A motor having At least one of the rotor core and the stator core is A laminated core according to claim 13. Motor.

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