Adhesive application device, manufacturing device for laminated core equipped with the same, and method for manufacturing laminated core

Abstract

Provided is an adhesive application device capable of applying an adhesive to an appropriate position on a core member having a different shape. 【Solution means】The adhesive application device 70 includes a plurality of nozzles 73 capable of discharging the granular adhesive, and a sub-control device 85 capable of controlling the discharge of the adhesive for each nozzle 73. The sub-control device 85 is configured to control the presence or absence of the discharge of the adhesive for each nozzle 73 so that at least one of the following states is achieved: a state in which a plurality of dot-like adhesives are applied to the lower surface WL of the core member 130 independently of each other, and a state in which at least a part of the plurality of dot-like adhesives are applied overlapping each other.

Description

Technical Field

[0001] The present invention relates to an adhesive coating device, a laminated core manufacturing device including the same, and a method for manufacturing a laminated core.

Background Art

[0002] A laminated core used in a motor or the like is formed by punching a strip-shaped metal plate (for example, an electromagnetic steel sheet) into a predetermined shape to form a core member (core), and laminating and integrating the formed core members. The core members are integrated by, for example, adhesion. For example, Patent Document 1 discloses a manufacturing device for a laminated core in which an adhesive is applied to a core member from a needle and the core members are laminated to be adhered to each other.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the technique disclosed in Patent Document 1, since the adhesive is configured to be applied from a needle provided according to the shape of a specific core member, it is necessary to change the arrangement of the needles in order to apply the adhesive to a core member different from the shape of the specific core member. That is, the technique disclosed in Patent Document 1 has a problem that the adhesive cannot be applied to an appropriate position with respect to core members having different shapes.

[0005] The present invention has been made in view of such a point, and an object thereof is to provide an adhesive coating device capable of applying an adhesive to an appropriate position with respect to core members having different shapes.

Means for Solving the Problems

[0006] The adhesive application device according to the present invention is an adhesive application device used in a manufacturing device for a laminated core in which a plurality of core members are laminated and adhered to each other, and is an adhesive application device for applying an adhesive to the core member. The adhesive application device includes a plurality of nozzles capable of discharging granular adhesive, and a control device capable of controlling the discharge of the adhesive for each nozzle. The control device is configured to control the presence or absence of the discharge of the adhesive for each nozzle so that at least one of a state in which a plurality of dot-shaped adhesives are independently applied to the core member and a state in which at least a part of the plurality of dot-shaped adhesives are overlapped and applied is achieved.

[0007] According to the adhesive application device of the present invention, the control device is configured to control the presence or absence of the discharge of the adhesive for each nozzle so that at least one of a state in which a plurality of dot-shaped adhesives are independently applied to the core member and a state in which at least a part of the plurality of dot-shaped adhesives are overlapped and applied is achieved. Thus, since the presence or absence of the discharge of the adhesive can be controlled for each nozzle, the adhesive can be discharged from a predetermined nozzle to the core member according to the shape of the core member. That is, the adhesive can be discharged from an appropriate nozzle to core members having different shapes.

[0008] The manufacturing device for a laminated core according to the present invention includes an adhesive application device, a lower die having a die hole formed therein, and an upper die having a punch corresponding to the die hole and punching a metal plate. The lower die has an inner shape punching stage in which the metal plate is punched to form the inner shape of the core member, and an outer shape punching stage in which the metal plate is punched to form the outer shape of the core member. The adhesive application device is disposed between the inner shape punching stage and the outer shape punching stage with respect to the conveyance direction of the metal plate.

[0009] According to the manufacturing apparatus for a laminated core of the present invention, the adhesive application device is disposed between the inner punching stage and the outer punching stage with respect to the conveyance direction of the metal plate. According to the above aspect, the adhesive can be discharged from a predetermined nozzle to the core member in accordance with the shape of the core member having the inner shape formed.

[0010] The manufacturing method for a laminated core according to the present invention is a method for manufacturing a laminated core in which a plurality of core members are laminated and adhered to each other, and includes an application step of applying an adhesive to the core member. In the application step, for each of a plurality of nozzles capable of discharging the granular adhesive, the presence or absence of discharging the adhesive is controlled so that at least one of a state in which a plurality of dot-shaped adhesives are independently applied to the core member and a state in which at least a part of the plurality of dot-shaped adhesives are overlapped and applied is achieved.

[0011] According to the manufacturing method for a laminated core of the present invention, in the application step, for each of a plurality of nozzles capable of discharging the granular adhesive, the presence or absence of discharging the adhesive is controlled so that at least one of a state in which a plurality of dot-shaped adhesives are independently applied to the core member and a state in which at least a part of the plurality of dot-shaped adhesives are overlapped and applied is achieved. Thus, since the presence or absence of discharging the adhesive can be controlled for each nozzle, the adhesive can be discharged from a predetermined nozzle to the core member in accordance with the shape of the core member. That is, the adhesive can be discharged from an appropriate nozzle for core members having different shapes.

Effect of the Invention

[0012] According to the present invention, it is possible to provide an adhesive application device capable of applying an adhesive to an appropriate position with respect to core members having different shapes.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

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Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

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Figure 17

DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of a laminated core and a manufacturing apparatus for a laminated core according to the present invention will be described with reference to the drawings. It should be noted that the embodiments described here are not intended to limit the present invention in particular. Also, members and parts having the same function are denoted by the same reference numerals, and redundant descriptions are omitted or simplified as appropriate.

[0015] FIG. 1 is a side view of a motor 100. As shown in FIG. 1, the motor 100 includes a rotor 110 and a stator 210 disposed outside the rotor 110 in the radial direction.

[0016] As shown in FIGS. 1 and 2, the rotor 110 includes a rotating shaft 115, a rotor core 120, and a magnet 160.

[0017] As shown in FIG. 1, the rotating shaft 115 extends in the vertical direction Z. The vertical direction Z is an example of the first direction. The symbol U indicates upward, and the symbol D indicates downward. Note that the direction in which the rotating shaft 115 extends is not limited to the vertical direction Z. A part of the rotating shaft 115 (here, the lower end portion 115B) protrudes downward D from the stator 210. An output member is attached to the lower end portion 115B of the rotating shaft 115.

[0018] As shown in FIG. 2, the rotor core 120 is an annular member centered on the axis 115C of the rotating shaft 115. The rotor core 120 is fixed to the rotating shaft 115. The rotor core 120 is composed of a laminated core in which a plurality of core members 130 are laminated in the vertical direction Z and adhered to each other. The rotor core 120 is an example of a laminated core. The core member 130 is processed into a predetermined shape by punching using a manufacturing apparatus 10 (see FIG. 10) for a laminated core described later. The plurality of core members 130 include a first core member 140 having a first shape and a second core member 150 having a second shape.

[0019] As shown in FIG. 3, the first core member 140 is formed in an annular shape. The first core member 140 has an annular first main body portion 141, a first press-fitting hole 145, a plurality of first magnet insertion holes 142, and a plurality of first refrigerant flow holes 149.

[0020] As shown in FIG. 3, the first press-fitting hole 145 is a hole that penetrates the first main body portion 141 in the vertical direction Z. The first press-fitting hole 145 is a hole into which the rotating shaft 115 is press-fitted. The first press-fitting hole 145 is circular in plan view (i.e., when viewed from the vertical direction Z).

[0021] As shown in FIG. 3, the first magnet insertion hole 142 is a hole into which a magnet 160 (see FIG. 2) extending in the vertical direction Z is inserted. The first magnet insertion hole 142 penetrates the first main body portion 141 in the vertical direction Z. The first magnet insertion hole 142 is located outside the first press-fitting hole 145 in the radial direction. The first magnet insertion hole 142 is rectangular in plan view. The plurality of first magnet insertion holes 142 are arranged in the circumferential direction. The first magnet insertion hole 142 is an example of the first through hole. Note that the shape and number of the first magnet insertion holes 142 are not limited to those shown in FIG. 3. A resin (for example, a thermosetting resin such as an epoxy resin) for fixing the magnet 160 is injected into the first magnet insertion hole 142.

[0022] As shown in FIG. 3, the first refrigerant flow hole 149 is a hole through which the refrigerant flows. The first refrigerant flow hole 149 penetrates the first main body portion 141 in the vertical direction Z. The first refrigerant flow hole 149 is located outside the first press-fitting hole 145 in the radial direction. The first refrigerant flow hole 149 is located inside the first magnet insertion hole 142 in the radial direction. The first refrigerant flow hole 149 is circular in plan view. The plurality of first refrigerant flow holes 149 are arranged in the circumferential direction. The first refrigerant flow hole 149 is an example of the first through hole. Note that the shape and number of the first refrigerant flow holes 149 are not limited to those shown in FIG. 3.

[0023] As shown in FIG. 3, an adhesive G is applied to the first adhesive application area 144. The first adhesive application area 144 is provided on the lower surface 141BS of the first main body 141 of the first core member 140. The first adhesive application area 144 is an area of the adhesive G applied to the first core member 140. The first adhesive application area 144 includes an area 144A provided so as to surround one first magnet insertion hole 142 and an area 144B provided so as to surround one first refrigerant flow hole 149. Also, as shown in FIG. 4, the first adhesive application area 144 includes an area 144C provided so as to surround two first refrigerant flow holes 149. The first refrigerant flow hole 149 is surrounded by the adhesive G without a gap. Note that the first magnet insertion hole 142 may be surrounded by the adhesive G without a gap or may be surrounded while allowing a gap. In FIGS. 3 and 4, the first adhesive application area 144 is indicated by a two-dot chain line.

[0024] As shown in FIG. 5, the second core member 150 is formed in an annular shape. The second core member 150 has an annular second main body 151, a second press-fitting hole 155, a plurality of second magnet insertion holes 152, and a plurality of second refrigerant flow holes 159. The second core member 150 and the first core member 140 have the same configuration except that the shapes of the second refrigerant flow holes 159 and the first refrigerant flow holes 149 (see FIG. 3) are different.

[0025] As shown in FIG. 5, the second press-fitting hole 155 is a hole that penetrates the second main body 151 in the vertical direction Z. The second press-fitting hole 155 is a hole into which the rotation shaft 115 is press-fitted. The second press-fitting hole 155 is circular in plan view (i.e., as viewed from the vertical direction Z). The second press-fitting hole 155 communicates with the first press-fitting hole 145 (see FIG. 3). In plan view, the second press-fitting hole 155 and the first press-fitting hole 145 overlap.

[0026] As shown in FIG. 5, the second magnet insertion hole 152 is a hole into which a magnet 160 (see FIG. 2) extending in the vertical direction Z is inserted. The second magnet insertion hole 152 penetrates the second main body portion 151 in the vertical direction Z. The second magnet insertion hole 152 is located radially outside the second press-fitting hole 155. The second magnet insertion hole 152 is rectangular in plan view. A plurality of second magnet insertion holes 152 are arranged in the circumferential direction. The second magnet insertion hole 152 is an example of the second through hole. The second magnet insertion hole 152 communicates with the first magnet insertion hole 142 (see FIG. 3). In plan view, the second magnet insertion hole 152 and the first magnet insertion hole 142 overlap. Note that the shape and number of the second magnet insertion holes 152 are not limited to those shown in FIG. 4. A resin (for example, a thermosetting resin such as an epoxy resin) for fixing the magnet 160 is injected into the second magnet insertion hole 152.

[0027] As shown in FIG. 5, the second refrigerant flow hole 159 is a hole through which refrigerant flows. The second refrigerant flow hole 159 penetrates the second main body portion 151 in the vertical direction Z. The second refrigerant flow hole 159 is located radially outside the second press-fitting hole 155. The second refrigerant flow hole 159 is located radially inside the second magnet insertion hole 152. The second refrigerant flow hole 159 is oval in plan view. A plurality of second refrigerant flow holes 159 are arranged in the circumferential direction. The second refrigerant flow hole 159 is an example of the second through hole. The second refrigerant flow hole 159 communicates with the first refrigerant flow hole 149 (see FIG. 3). In plan view, a part of the second refrigerant flow hole 159 and the first refrigerant flow hole 149 overlap. Here, in plan view, one second refrigerant flow hole 159 overlaps with two first refrigerant flow holes 149. Note that the shape and number of the second refrigerant flow holes 159 are not limited to those shown in FIG. 5.

[0028] As shown in FIG. 5, an adhesive G is applied to the second adhesive application region 154. The second adhesive application region 154 is provided on the lower surface 151BS of the second main body portion 151 of the second core member 150. The second adhesive application region 154 is the region of the adhesive G applied to the second core member 150. The second adhesive application region 154 and the first adhesive application region 144 (see FIG. 3) are at least partially different. The second adhesive application region 154 includes a region 154A provided so as to surround one second magnet insertion hole 152 and a region 154B provided so as to surround one second refrigerant flow hole 159. The second refrigerant flow hole 159 is surrounded without a gap by the adhesive G. Note that the second magnet insertion hole 152 may be surrounded without a gap by the adhesive G or may be surrounded while allowing a gap. In FIG. 5, the second adhesive application region 154 is indicated by a two-dot chain line.

[0029] As shown in FIG. 2, it includes a core member 130A located at the lowermost position among the rotor cores 120, a plurality of core members 130B laminated above the core member 130A, a plurality of core members 130C laminated above the core member 130B, a core member 130D laminated above the core member 130C, and a plurality of core members 130E laminated above the core member 130D. The core member 130A is the first core member 140, and no adhesive G is applied to the first adhesive application region 144. The core member 130B is the first core member 140, and the adhesive G is applied to regions 144A and 144B of the first adhesive application region 144 (see FIG. 3). Here, the plurality of core members 130B are referred to as a core group 130BX. The core member 130C is the second core member 150, and the adhesive G is applied to regions 154A and 154B of the second adhesive application region 154 (see FIG. 5). Here, the plurality of core members 130C are referred to as a core group 130CX. The core member 130D is the first core member 140, and the adhesive G is applied to regions 144A and 144C of the first adhesive application region 144 (see FIG. 4). The core member 130E is the first core member 140, and the adhesive G is applied to regions 144A and 144B of the first adhesive application region 144 (see FIG. 3). Here, the plurality of core members 130E are referred to as a core group 130EX. The thickness of the adhesive G applied to the first adhesive application region 144 and the second adhesive application region 154 is 0.1 μm or more and 50 μm or less. Examples of the adhesive G include a thermosetting adhesive, an anaerobic adhesive, and a two-component curing adhesive. In the first adhesive application region 144 and the second adhesive application region 154, a plurality of dot-shaped adhesives G that at least partially overlap are arranged linearly (see FIG. 15). Here, in the first adhesive application region 144 and the second adhesive application region 154, a plurality of dot-shaped adhesives G that overlap each other are arranged linearly (see FIG. 16). In the first adhesive application region 144 and the second adhesive application region 154, a plurality of dot-shaped adhesives G that are independent of each other may be arranged linearly. The adhesives G arranged linearly include at least one of a linear shape, a curved shape, and a wavy shape.

[0030] As shown in FIG. 1, the stator 210 houses the rotor 110. The stator 210 rotatably supports the rotor 110. The stator 210 includes a stator core 220 and a plurality of windings 215 wound around the stator core 220. The connection portion 215A between the plurality of windings 215 is located above U of the rotation axis 15. Note that the plurality of windings 215 may be star-connected or delta-connected.

[0031] As shown in FIG. 1, the stator core 220 is an annular member centered on the axis 115C of the rotation axis 115. The stator core 220 is fixed to a cover (not shown) of the motor 100. As shown in FIG. 6, the stator core 220 is composed of a laminated core in which a plurality of core members 230 are laminated in the vertical direction Z and adhered to each other. The stator core 220 is an example of a laminated core. The core member 230 is processed into a predetermined shape by punching using a manufacturing apparatus 10 (see FIG. 10) for the laminated core. The plurality of core members 230 includes a first core member 240 having a first shape and a second core member 250 having a second shape.

[0032] As shown in FIG. 7, the first core member 240 is formed in an annular shape. The first core member 240 has a first back yoke portion 241 formed in an annular shape, a plurality of first teeth portions 243 protruding from the inner peripheral edge of the first back yoke portion 241 toward the inner diameter side, and a plurality of first refrigerant flow holes 249.

[0033] As shown in FIG. 7, the first refrigerant flow hole 249 is a hole through which the refrigerant flows. The first refrigerant flow hole 249 penetrates the first back yoke portion 241 in the vertical direction Z. The first refrigerant flow hole 249 is located radially outside the first teeth portion 243. The first refrigerant flow hole 249 is circular in plan view. The plurality of first refrigerant flow holes 249 are arranged in the circumferential direction. The first refrigerant flow hole 249 is an example of a first through hole. Note that the shape and number of the first refrigerant flow holes 249 are not limited to those shown in FIG. 7.

[0034] As shown in Fig. 7, an adhesive G is applied to the first adhesive application region 244. The first adhesive application region 244 is provided on the lower surface 241BS of the first back yoke portion 241 and the lower surface 243BS of the first tooth portion 243 of the first core member 240. The first adhesive application region 244 is the region of the adhesive G applied to the first core member 240. The first adhesive application region 244 includes a region 244A extending in the radial direction and provided along the first tooth portion 243, a region 244B extending in the circumferential direction and provided along the first back yoke portion 241, and a region 244C provided so as to surround one first refrigerant flow hole 249. Further, as shown in Fig. 8, the first adhesive application region 244 includes a region 244D provided so as to surround two first refrigerant flow holes 249. The first refrigerant flow hole 249 is surrounded by the adhesive G without any gaps. In Figs. 7 and 8, the first adhesive application region 244 is indicated by a two-dot chain line.

[0035] As shown in Fig. 9, the second core member 250 is formed in an annular shape. The second core member 250 has an annular second back yoke portion 251, a plurality of second tooth portions 253 protruding from the inner peripheral edge of the second back yoke portion 251 toward the inner diameter side, and a plurality of second refrigerant flow holes 259. The first back yoke portion 241 (see Fig. 7) overlaps with the second back yoke portion 251 in a plan view (i.e., viewed from the vertical direction Z). The first tooth portion 243 (see Fig. 7) overlaps with the second tooth portion 253 in a plan view.

[0036] As shown in Fig. 9, the second refrigerant flow hole 259 is a hole through which the refrigerant flows. The second refrigerant flow hole 259 penetrates the second back yoke portion 251 in the vertical direction Z. The second refrigerant flow hole 259 is located radially outside the second tooth portion 253. The second refrigerant flow hole 259 is oval in plan view. A plurality of second refrigerant flow holes 259 are arranged in the circumferential direction. The second refrigerant flow hole 259 is an example of the second through hole. The first refrigerant flow hole 249 (see Fig. 7) communicates with the second refrigerant flow hole 259. In plan view, a part of the second refrigerant flow hole 259 overlaps with the first refrigerant flow hole 249. Here, in plan view, one second refrigerant flow hole 259 overlaps with two first refrigerant flow holes 249. Note that the shape and number of the second refrigerant flow holes 259 are not limited to those shown in Fig. 9.

[0037] As shown in Fig. 9, an adhesive G is applied to the second adhesive application region 254. The second adhesive application region 254 is provided on the lower surface 251BS of the second back yoke portion 251 and the lower surface 253BS of the second tooth portion 253 of the second core member 250. The second adhesive application region 254 is a region of the adhesive G applied to the second core member 250. The second adhesive application region 254 includes a region 254A extending in the radial direction and provided along the second tooth portion 253, a region 254B extending in the circumferential direction and provided along the second back yoke portion 251, and a region 254C provided so as to surround the second refrigerant flow hole 259. The second refrigerant flow hole 259 is surrounded by the adhesive G without any gaps. In Fig. 9, the second adhesive application region 254 is indicated by a two-dot chain line.

[0038] As shown in FIG. 6, it includes a core member 230A located at the lowermost position among the stator cores 220, a plurality of core members 230B laminated above the core member 230A, a plurality of core members 230C laminated above the core member 230B, a core member 230D laminated above the core member 230C, and a plurality of core members 230E laminated above the core member 230D. The core member 230A is the first core member 240, and no adhesive G is applied to the first adhesive application region 244. The core member 230B is the first core member 240, and adhesive G is applied to regions 244A, 244B, and 244C of the first adhesive application region 244 (see FIG. 7). Here, the plurality of core members 230B are referred to as a core group 230BX. The core member 230C is the second core member 250, and adhesive G is applied to regions 254A, 254B, and 254C of the second adhesive application region 254 (see FIG. 9). Here, the plurality of core members 230C are referred to as a core group 230CX. The core member 230D is the first core member 240, and adhesive G is applied to regions 244A, 244B, and 244D of the first adhesive application region 244 (see FIG. 8). The core member 230E is the first core member 240, and adhesive G is applied to regions 244A, 244B, and 244C of the first adhesive application region 244 (see FIG. 7). Here, the plurality of core members 230E are referred to as a core group 230EX. The thickness of the adhesive G applied to the first adhesive application region 244 and the second adhesive application region 254 is 0.1 μm or more and 50 μm or less. Examples of the adhesive G include thermosetting adhesives, anaerobic adhesives, and two-component curing adhesives. In the first adhesive application region 244 and the second adhesive application region 254, a plurality of dot-shaped adhesives G that at least partially overlap are arranged linearly (see FIG. 15). Here, in the first adhesive application region 244 and the second adhesive application region 254, a plurality of dot-shaped adhesives G that overlap each other are arranged linearly (see FIG. 16). In the first adhesive application region 244 and the second adhesive application region 254, a plurality of dot-shaped adhesives G that are independent of each other may be arranged linearly. The adhesives G arranged linearly include at least one of a linear shape, a curved shape, and a wavy shape.

[0039] Next, the manufacturing apparatus 10 of the laminated core of the present embodiment (hereinafter referred to as the manufacturing apparatus 10) will be described. Here, the case of manufacturing the rotor core 120, which is an example of the laminated core, in the manufacturing apparatus 10 will be described as an example. In the following description, the laminated core 120 may be referred to. Note that in the manufacturing apparatus 10, the stator core 220, which is an example of the laminated core, can also be manufactured.

[0040] As shown in FIG. 10, the manufacturing apparatus 10 manufactures a laminated core 120 (see FIG. 2) in which a plurality of core members 130 (see FIG. 2) are laminated in the vertical direction Z and adhered to each other. The manufacturing apparatus 10 is a progressive die. In the manufacturing apparatus 10, a strip-shaped metal plate W is intermittently conveyed in the conveying direction FD with respect to a plurality of processing stages 25 (see FIG. 11) described later. The strip-shaped metal plate W is, for example, an electromagnetic steel sheet. The manufacturing apparatus 10 includes a lower die 20, a mounting table 35 (see FIG. 12), an upper die 40, a stripper plate 60, a detection device 65 (see FIG. 11), an adhesive application device 70 (see FIG. 11), and a main control device 90.

[0041] The lower die 20 is fixed to the floor surface. As shown in FIG. 11, the lower die 20 includes a lower die body 21, a die plate 22, and a die 23. The die plate 22 and the die 23 are placed on the lower die body 21. The die plate 22 holds the die 23. The lower die 20 is provided with a plurality of processing stages 25. The processing stages 25 include a first inner shape punching stage 25A, a second inner shape punching stage 25B, an adhesive application stage 25C, and an outer shape punching stage 25D. The first inner shape punching stage 25A, the second inner shape punching stage 25B, the adhesive application stage 25C, and the outer shape punching stage 25D are arranged in this order in the conveying direction FD. The region where the first inner shape punching stage 25A and the second inner shape punching stage 25B are arranged is the first region P1. The region where the adhesive application stage 25C is arranged is the second region P2. The region where the outer shape punching stage 25D is arranged is the third region P3.

[0042] As shown in FIG. 11, the die 23 includes a first die 23A included in the first inner shape punching stage 25A, a second die 23B included in the second inner shape punching stage 25B, and a third die 23D included in the outer shape punching stage 25D. A die hole 26 is formed in the die 23. A first inner shape punching die hole 26A as the die hole 26 is formed in the first die 23A. A second inner shape punching die hole 26B as the die hole 26 is formed in the second die 23B. An outer shape punching die hole 26D as the die hole 26 is formed in the third die 23D.

[0043] As shown in FIG. 11, the die plate 22 includes a first die plate 22A that holds the first die 23A, a second die plate 22B that holds the second die 23B, and a third die plate 22D that holds the third die 23D. The upper surface 22T of the die plate 22 and the upper surface 23T of the die 23 are located at the same height. More specifically, the upper surface 22T of the first die plate 22A and the upper surface 23T of the first die 23A, the upper surface 22T of the second die plate 22B and the upper surface 23T of the second die 23B, and the upper surface 22T of the third die plate 22D and the upper surface 23T of the third die 23D are located at the same height.

[0044] As shown in FIG. 11, the first inner shape punching stage 25A includes the first die plate 22A, the first die 23A, the first inner shape punching die hole 26A, and a first inner shape punching punch 45A (see FIG. 12) described later. The second inner shape punching stage 25B includes the second die plate 22B, the second die 23B, the second inner shape punching die hole 26B, and a second inner shape punching punch 45B (see FIG. 12) described later. The outer shape punching stage 25D includes the third die plate 22D, the third die 23D, the outer shape punching die hole 26D, an outer shape punching punch 45D (see FIG. 12) described later, a squeeze ring 29 (see FIG. 12), and a mounting table 35 (see FIG. 12). The lower die body 21 includes an adhesive application stage 25C. An adhesive application through hole 27 is formed in the lower die body 21.

[0045] As shown in FIG. 12, the squeeze ring 29 is disposed below the third die 23D. The squeeze ring 29 holds the formed core member 130 from the side. The squeeze ring 29 applies a lateral pressure (i.e., clamping force) to the laminated core member 130. The squeeze ring 29 holds the core member 130 punched into the die hole 26D for outer shape punching by the punch 45D for outer shape punching with a predetermined lateral pressure.

[0046] As shown in FIG. 12, the mounting table 35 is provided on the lower die 20. The mounting table 35 is provided at a position facing the punch 45D for outer shape punching. The mounting table 35 is provided so as to be able to move up and down by a support member 36. The formed core member 130 is sequentially placed on the mounting table 35. The mounting table 35 can be located inside the third die 23D and the squeeze ring 29. On the mounting table 35, the laminated core 120 is manufactured.

[0047] The metal plate W is intermittently conveyed to the lower die 20 by a conveying device (not shown) provided near the manufacturing apparatus 10. The metal plate W is intermittently conveyed through the first inner shape punching stage 25A, the second inner shape punching stage 25B, the adhesive application stage 25C, and the outer shape punching stage 25D in this order. When forming one core member 130, the metal plate W is intermittently conveyed in the conveying direction FD through the first region P1, the second region P2, and the third region P3 in this order. The conveying device holds the metal plate W in a wound state. The metal plate W is conveyed to the lower die 20 by an unwinding device (not shown) of the conveying device and is press-worked. The end material of the press-worked metal plate W is conveyed from the lower die 20 by a winding device (not shown) of the conveying device and is wound by the winding device. Instead of the unwinding device and the winding device of the conveying device, the metal plate W may be sandwiched and conveyed by a pair of upper and lower rotating rolls respectively arranged on the upstream side and the downstream side of the manufacturing apparatus 10.

[0048] As shown in FIG. 11, the die 23 of the lower die 20 has a plurality of lift members 30. The lift members 30 bias the metal plate W upward. When the metal plate W is intermittently conveyed in the conveying direction FD on the die plate 22 and the die 23, the lift members 30 push up the metal plate W so that the metal plate W is positioned a predetermined distance above the upper surface 22T of the die plate 22 and the upper surface 23T of the die 23. The lift members 30 are biased upward by a biasing member (for example, a coil spring) (not shown) provided on the die plate 22. When the stripper plate 60 (see FIG. 12) moves downward and the metal plate W is pressed downward by the stripper plate 60, the lift members 30 move downward against the biasing force of the biasing member. As a result, the metal plate W is pressed against the upper surface 22T of the die plate 22 of the lower die 20 (more specifically, the upper surface 22T of the first die plate 22A, the upper surface 22T of the second die plate 22B, and the upper surface 22T of the third die plate 22D) and the upper surface 23T of the die 23 (more specifically, the upper surface 23T of the first die 23A, the upper surface 23T of the second die 23B, and the upper surface 23T of the third die 23D). On the other hand, when the stripper plate 60 moves upward and the pressing force of the stripper plate 60 is no longer applied to the metal plate W, the lift members 30 move upward by the biasing force of the biasing member. As a result, the lift members 30 hold the metal plate W a predetermined dimension above the lower die 20 (more specifically, the upper surface 22T of the die plate 22 and the upper surface 23T of the die 23).

[0049] As shown in FIG. 12, the upper die 40 is disposed above the lower die 20. The upper die 40 is configured to be movable closer to and away from the lower die 20. The upper die 40 has a plurality of punches 45 corresponding to the die holes 26. The punches 45 include a first inner shape punching punch 45A, a second inner shape punching punch 45B, and an outer shape punching punch 45D. The first inner shape punching punch 45A is positioned above the first inner shape punching die hole 26A. The first inner shape punching punch 45A is configured to be insertable into the first inner shape punching die hole 26A. The second inner shape punching punch 45B is positioned above the second inner shape punching die hole 26B. The second inner shape punching punch 45B is configured to be insertable into the second inner shape punching die hole 26B. The outer shape punching punch 45D is positioned above the outer shape punching die hole 26D. The outer shape punching punch 45D is configured to be insertable into the outer shape punching die hole 26D. At the first inner shape punching stage 25A (see also FIG. 11), after the upper die 40 descends and approaches the lower die 20, the metal plate W is punched by the first inner shape punching punch 45A and the first inner shape punching die hole 26A. Thereby, the first inner shape of the core member 130 is formed in the metal plate W (for example, the inner shape of the first core member 140. See FIG. 3). At the second inner shape punching stage 25B (see also FIG. 11), after the upper die 40 descends and approaches the lower die 20, the metal plate W is punched by the second inner shape punching punch 45B and the second inner shape punching die hole 26B. Thereby, the second inner shape of the core member 130 is formed in the metal plate W (for example, the inner shape of the second core member 150. See FIG. 5). Note that when the upper die 40 descends and approaches the lower die 20, only one of the first inner shape punching punch 45A and the second inner shape punching punch 45B is configured to punch the metal plate W. That is, the core member 130 having the first inner shape or the second inner shape is formed in the metal plate W. At the outer shape punching stage 25D (see also FIG. 11), after the upper die 40 descends and approaches the lower die 20, the metal plate W is punched by the outer shape punching punch 45D and the outer shape punching die hole 26D.As a result, the outer shape of the core member 130 is formed on the metal plate W, and the core member 130 (see also FIGS. 3 and 5) is completed. The core member 130 is sequentially stacked on the mounting table 35 located in the die hole 26D for outer shape punching. As will be described later, since an adhesive is applied to the lower surface WL of the completed core member 130, when the core members 130 are stacked, the core members 130 stacked in the vertical direction are adhered to each other, and the stacked core 120 is manufactured.

[0050] As shown in FIG. 12, the stripper plate 60 is provided on the upper die 40. The stripper plate 60 is disposed at a position facing the die plate 22 of the lower die 20. The stripper plate 60 is configured to be movable in the vertical direction together with the upper die 40. The stripper plate 60 restricts the vertical movement of the metal plate W when punching the metal plate W with the punch 45. The stripper plate 60 presses the metal plate W against the upper surface 22T of the die plate 22 and the upper surface 23T of the die 23. The stripper plate 60 is formed with a first punch insertion hole 60A through which the first inner shape punching punch 45A is inserted, a second punch insertion hole 60B through which the second inner shape punching punch 45B is inserted, and a third punch insertion hole 60D through which the outer shape punching punch 45D is inserted.

[0051] As shown in FIGS. 11 and 12, the adhesive application device 70 is provided on the lower die body 21 of the lower die 20. The adhesive application device 70 is disposed between the second inner shape punching stage 25B and the outer shape punching stage 25D with respect to the conveyance direction FD of the metal plate W. The adhesive application device 70 is disposed closer to the second inner shape punching stage 25B than the center between the second inner shape punching stage 25B and the outer shape punching stage 25D with respect to the conveyance direction FD. Note that the adhesive application device 70 may be disposed closer to the outer shape punching stage 25D than the center between the second inner shape punching stage 25B and the outer shape punching stage 25D with respect to the conveyance direction FD. The adhesive application device 70 is provided on the adhesive application stage 25C. More specifically, the adhesive application device 70 is disposed within the through hole 27 for adhesive application. The adhesive application device 70 is located below the metal plate W. The adhesive application device 70 applies an adhesive to the lower surface WL of the core member 130 formed on the metal plate W. The adhesive application device 70 applies an adhesive to the lower surface WL of the core member 130 formed on the metal plate W while the metal plate W is intermittently conveyed from the first inner shape punching stage 25A or the second inner shape punching stage 25B to the outer shape punching stage 25D. The adhesive application device 70 of the present embodiment applies an adhesive to the lower surface WL of the core member 130 formed on the metal plate W by an inkjet method. Examples of the adhesive used in the adhesive application device 70 include a thermosetting adhesive, an anaerobic adhesive, and a two-component curing adhesive, but it is not particularly limited as long as sufficient adhesive strength for forming the laminated core 120 is obtained.

[0052] As shown in FIGS. 11 and 12, the adhesive application device 70 includes an inkjet head 71, a sub-control device 85, and a cleaning device 88. Since the adhesive application device 70 includes the inkjet head 71, the adhesive can be applied to the lower surface WL of the core member 130 according to various shapes of the core member 130 formed on the metal plate W. The inkjet head 71 is arranged upstream of the cleaning device 88 with respect to the conveyance direction FD. Note that the inkjet head 71 may be arranged downstream of the cleaning device 88 with respect to the conveyance direction FD. The sub-control device 85 is arranged below the inkjet head 71 and the cleaning device 88. In the present embodiment, the adhesive application device 70 is fixed immovably with respect to the conveyance direction FD and the width direction WD intersecting the conveyance direction FD in plan view, but may be provided movably with respect to the conveyance direction FD and / or the width direction WD. The width direction WD is an example of the second direction. Here, the width direction WD is orthogonal to the conveyance direction FD in plan view. The adhesive application device 70 is configured to be able to change its orientation. The adhesive application device 70 is configured to be rotatable, for example, around an axis (not shown). Note that the adhesive application device 70 does not include a recovery device for recovering the adhesive discharged from the nozzles 73 of the inkjet head 71.

[0053] As shown in FIG. 13, the inkjet head 71 includes a first inkjet head 71A, a second inkjet head 71B, and a third inkjet head 71C. The first inkjet head 71A, the second inkjet head 71B, and the third inkjet head 71C have a plurality of nozzles 73 capable of discharging granular adhesive. The first inkjet head 71A, the second inkjet head 71B, and the third inkjet head 71C are arranged in the conveyance direction FD. The second inkjet head 71B and the third inkjet head 71C are arranged at the same position with respect to the conveyance direction FD. In the present embodiment, the first inkjet head 71A is located upstream of the second inkjet head 71B and the third inkjet head 71C in the conveyance direction FD. In the width direction WD, a part of the first inkjet head 71A overlaps with a part of the second inkjet head 71B. In the width direction WD, a part of the first inkjet head 71A overlaps with a part of the third inkjet head 71C. The plurality of nozzles 73 of the first inkjet head 71A and the plurality of nozzles 73 of the second inkjet head 71B are arranged at equal intervals in the width direction WD. The plurality of nozzles 73 of the first inkjet head 71A and the plurality of nozzles 73 of the third inkjet head 71C are arranged at equal intervals in the width direction WD. In the present embodiment, the adhesive application device 70 includes three inkjet heads 71, namely, the first inkjet head 71A to the third inkjet head 71C, but the number of inkjet heads 71 may be one, two, or four or more. Further, the arrangement of the inkjet heads 71 is not limited to the above arrangement.

[0054] As shown in FIG. 14, the inkjet head 71 includes a case 72, nozzles 73 and an adhesive storage portion 74 formed in the case 72, and an actuator 76 and a heater 78 disposed in the case 72. The nozzles 73 are formed in the side wall of the case 72. The nozzles 73 communicate with the adhesive storage portion 74 through a communication passage 75 formed by the actuator 76. The nozzles 73 are configured to be able to change the opening direction. Here, the opening direction of the nozzles 73 is configured to be changed by the rotation of the adhesive application device 70 around an axis not shown in the figure. The adhesive storage portion 74 stores the adhesive. An adhesive supply port 79 for supplying the adhesive to the adhesive storage portion 74 is formed in the side wall of the case 72. Here, the direction in which the adhesive supply port 79 opens is opposite to the direction in which the nozzles 73 open. Note that the adhesive supply port 79 only needs to communicate with the adhesive storage portion 74, and the position of the adhesive supply port 79 is not limited in any way. The direction in which the nozzles 73 open when discharging the adhesive from the nozzles 73 toward the lower surface WL of the core member 130 is different from the direction in which the nozzles 73 open when filling the adhesive storage portion 74 with the adhesive. For example, the direction in which the nozzles 73 open when discharging the adhesive from the nozzles 73 toward the lower surface WL of the core member 130 is upward (for example, the opening faces directly upward), while the direction in which the nozzles 73 open when filling the adhesive storage portion 74 with the adhesive is downward (for example, the opening faces directly downward).

[0055] As shown in FIG. 14, the actuator 76 is fixed to the case 72. Here, two actuators 76 form a communication passage 75 that communicates the adhesive storage portion 74 and the nozzle 73. The actuator 76 is controlled by the sub-control device 85. The actuator 76 elastically deforms to expand or contract when receiving an electrical signal from the sub-control device 85, and is configured to expand or contract the communication passage 75. When the actuators 76 elastically deform so as to approach each other, the communication passage 75 contracts. Thereby, the adhesive is discharged from the nozzle 73. On the other hand, when the actuators 76 elastically deform so as to be separated from each other, the communication passage 75 expands. Thereby, the adhesive is supplied to the communication passage 75. The heater 78 heats the adhesive stored in the adhesive storage portion 74. The heater 78 is provided on the case 72 so as to be adjacent to the adhesive storage portion 74. The heater 78 is controlled by the sub-control device 85.

[0056] The sub-control device 85 is configured to be able to control the discharge of the adhesive for each nozzle 73 of the inkjet head 71. The sub-control device 85 controls the discharge of the adhesive for each nozzle 73 by controlling the actuator 76. The sub-control device 85 includes, for example, a CPU that executes instructions of a control program, a ROM that stores the program executed by the CPU, a RAM used as a working area for developing the program, and a storage device such as a memory that stores the above program and various data. The sub-control device 85 is an example of a control device of the adhesive application device 70.

[0057] The sub-control device 85 is configured to control the presence or absence of adhesive discharge for each nozzle 73 so that at least one of the following states is achieved: a state in which a plurality of dot-shaped adhesives are independently applied to the lower surface WL of the core member 130, and a state in which at least a part of the plurality of dot-shaped adhesives are applied overlapping each other. FIG. 15 is a diagram showing a state in which a state where a plurality of dot-shaped adhesives G are independently applied to the lower surface WL of the core member 130 and a state where at least a part of the plurality of dot-shaped adhesives G are applied overlapping each other coexist. FIG. 16 is a diagram showing a state in which a plurality of dot-shaped adhesives G are applied overlapping each other on the lower surface WL of the core member 130. The sub-control device 85 controls to discharge the adhesive singly, intermittently, or continuously for each nozzle 73 with respect to the lower surface WL of one core member 130. For example, the sub-control device 85 discharges the adhesive singly from the first nozzle 73A (see FIG. 13) with respect to the lower surface WL of one core member 130 (for example, discharges only one shot of the adhesive with respect to one core member 130), discharges the adhesive intermittently from the second nozzle 73B (see FIG. 13) (for example, after discharging one shot of the adhesive with respect to one core member 130, waits for a while and then repeats discharging one shot of the adhesive), and controls to discharge the adhesive continuously from the third nozzle 73C (see FIG. 13) (for example, discharges the adhesive continuously with respect to one core member 130). The sub-control device 85 discharges the adhesive from the nozzle 73 to the first adhesive application region 144 (see FIG. 3) set according to the shape of the first core member 140 (see FIG. 3). The sub-control device 85 discharges the adhesive from the nozzle 73 to the first adhesive application region 144 when the inner shape of the first core member 140 is formed at the first inner shape punching stage 25A (see FIG. 11). The sub-control device 85 discharges the adhesive from the nozzle 73 to the second adhesive application region 154 (see FIG. 5) set according to the shape of the second core member 150 (see FIG. 5). The sub-control device 85 discharges the adhesive from the nozzle 73 to the second adhesive application region 154 when the inner shape of the second core member 150 is formed at the second inner shape punching stage 25B (see FIG. 11). The sub-control device 85 is configured to apply the adhesive to the lower surface WL of the core member 130 during the conveyance of the metal plate W.Before starting the conveyance of the metal plate W, the sub-control device 85 is configured to send a signal to start discharging the adhesive to the nozzle 73. Before stopping the conveyance of the metal plate W, the sub-control device 85 is configured to send a signal to stop discharging the adhesive to the nozzle 73. Under predetermined conditions, the sub-control device 85 is configured not to discharge the adhesive from all of the plurality of nozzles 73 onto the lower surface WL of the core member 130. The predetermined conditions are, for example, when forming the first core member 130. Since the first core member 130 is placed on the mounting table 35, it is not necessary to apply the adhesive to the lower surface WL of the first core member 130. The sub-control device 85 is configured not to discharge the adhesive without blocking the nozzle 73 and the communication passage 75. Even when the nozzle 73 and the communication passage 75 are not blocked, the sub-control device 85 can be configured not to discharge the adhesive from the nozzle 73 by controlling the actuator 76. The sub-control device 85 can adjust the thickness of the adhesive discharged from the nozzle 73 and applied to the lower surface WL of the core member 130 to be between 0.1 μm and 50 μm. The sub-control device 85 can adjust the amount of the adhesive discharged from the nozzle 73 by controlling the actuator 76.

[0058] The cleaning device 88 cleans the nozzle 73. The cleaning device 88 is configured to clean the nozzle 73 when no adhesive is being discharged from the nozzle 73. The cleaning device 88 is, for example, a wiper made of rubber and is configured to wipe the nozzle 73 by moving in the conveyance direction FD by a moving mechanism (not shown).

[0059] As shown in FIGS. 11 and 12, the detection device 65 is provided in the lower die body 21 of the lower die 20. The detection device 65 is arranged between the adhesive application device 70 and the outer shape punching stage 25D with respect to the conveyance direction FD. The detection device 65 is provided on the adhesive application stage 25C. More specifically, the detection device 65 is arranged in the through-hole 27 for adhesive application. The detection device 65 is located below the metal plate W. The detection device 65 detects the adhesive applied to the lower surface WL of the core member 130. The detection device 65 is, for example, an image sensor.

[0060] As shown in FIG. 10, the main control device 90 controls the upper die 40, the mounting table 35, etc. The main control device 90 has the same configuration as the sub-control device 85 of the adhesive application device 70. The main control device 90 controls the vertical movement of the punch 45 and the stripper plate 60. In the present embodiment, the main control device 90 controls the vertical movement of the punch 45 and the stripper plate 60 by moving the upper die 40 in the vertical direction. The main control device 90 controls the approach of the upper die 40 to the lower die 20 and the separation from the lower die 20.

[0061] Next, a method for manufacturing the laminated core 120 will be described. Here, a method for manufacturing the laminated core 120 by focusing on one core member 130 constituting the laminated core 120 will be described. FIG. 17 is a flowchart showing the method for manufacturing the laminated core 120. As shown in FIG. 17, the method for manufacturing the laminated core 120 includes a conveyance step (step S10), an inner shape punching step (step S20), a conveyance step (step S30), an application step (step S40), a conveyance step (step S50), an outer shape punching step (step S60), a conveyance step (step S70), and a cleaning step (step S80). Here, the case where the metal plate W is punched at the first inner shape punching stage 25A to form the first core member 140 (see FIG. 3) as the core member 130 will be described as an example.

[0062] In the conveying process (step S10), the metal plate W is conveyed in the conveying direction FD. A part of the metal plate W moves onto the first inner shape punching stage 25A.

[0063] In the inner shape punching process (step S20), the metal plate W is punched by the first inner shape punching punch 45A to form the first inner shape of the first core member 140. More specifically, when the upper die 40 moves downward, the metal plate W is punched by the first inner shape punching punch 45A and the first inner shape punching die hole 26A, and the inner shape of the first core member 140 is formed on the metal plate W. In the inner shape punching process (step S20), the metal plate W is clamped by the stripper plate 60, the die plate 22, and the die 23.

[0064] In the conveying process (step S30), the metal plate W is conveyed in the conveying direction FD. The portion of the metal plate W where the inner shape of the first core member 140 is formed moves onto the adhesive application stage 25C. In step S30, the stripper plate 60 is separated from the metal plate W.

[0065] In the coating process (step S40), an adhesive is applied from the adhesive applicator 70 to the lower surface WL of the first core member 140 formed on the metal plate W. In step S40, the adhesive is applied to the first adhesive application region 144 on the lower surface WL of the first core member 140 formed on the metal plate W. That is, the adhesive is discharged from the nozzle 73 toward the first adhesive application region 144. In the coating process (step S40), the presence or absence of the discharge of the adhesive is controlled for each of the plurality of nozzles 73 capable of discharging the granular adhesive so that at least one of the states where a plurality of dot-shaped adhesives are independently applied to the lower surface WL of the first core member 140 and the state where at least a part of the plurality of dot-shaped adhesives are applied overlappingly is achieved. In the coating process (step S40), for the lower surface WL of one first core member 140, control is performed so that the adhesive is discharged from each nozzle 73 singly, intermittently, or continuously. Note that the coating process (step S40) may be performed simultaneously with the transport process (step S30) or the transport process (step S50). That is, the adhesive may be applied to the lower surface WL of the first core member 140 while the metal plate W is being transported. When the second inner shape of the second core member 150 is formed in the inner shape punching process (step S20), in the coating process (step S40), the adhesive is discharged from the nozzle 73 toward the second adhesive application region 154.

[0066] In the transport process (step S50), the metal plate W is transported in the transport direction FD. The predetermined portion of the metal plate W to which the adhesive is applied in the first adhesive application region 144 moves onto the outer shape punching stage 25D.

[0067] In the outer shape punching process (step S60), the metal plate W is punched by the outer shape punching punch 45D to form the outer shape of the first core member 140. More specifically, when the upper die 40 moves downward, the metal plate W pressed against the upper surface 22T of the die plate 22 and the upper surface 23T of the die 23 by the outer shape punching punch 45D and the outer shape punching die hole 26D is punched, and the outer shape of the first core member 140 is formed on the metal plate W. The formed first core member 140 is pressed by the outer shape punching punch 45D and sequentially stacked on the mounting table 35. Since the adhesive is applied to the first adhesive application region 144 on the lower surface WL of the formed first core member 140, the first core member 140 is sequentially stacked on the first core member 140 already stacked in the mounting table 35, whereby a laminated core 120 including a plurality of first core members 140 stacked in the vertical direction Z and adhered to each other is manufactured. In the outer shape punching process (step S110), the metal plate W is clamped by the stripper plate 60, the die plate 22, and the die 23.

[0068] In the conveying process (step S70), the metal plate W is conveyed in the conveying direction FD. The portion (i.e., the end material) of the metal plate W where the outer shape of the first core member 140 is formed is conveyed to the outside of the manufacturing apparatus 10.

[0069] In the cleaning process (step S80), the nozzle 73 is cleaned by the cleaning device 88. The cleaning process (step S80) is performed when the adhesive is not being discharged from the nozzle 73. For this reason, the cleaning process (step S80) is not limited to being performed after the conveying process (step S70), and may be performed simultaneously with, or between, processes other than the coating process (step S40).

[0070] When manufacturing the first core member 130, a non-coating process is performed instead of the above coating process (step S40). In the non-coating process, the adhesive is not discharged from all of the plurality of nozzles 73 with respect to the lower surface WL of the core member 130.

[0071] As described above, according to the adhesive application device 70 of the present embodiment, the sub-control device 85 controls the presence or absence of the discharge of the adhesive for each nozzle 73 so that at least one of the states where a plurality of dot-shaped adhesives are independently applied to the lower surface WL of the core member 130 and the state where at least a part of the plurality of dot-shaped adhesives are applied overlappingly is achieved. Thus, since the presence or absence of the discharge of the adhesive can be controlled for each nozzle 73, the adhesive can be discharged from a predetermined nozzle 73 to the lower surface WL of the core member 130 according to the shape of the core member 130. That is, the adhesive can be discharged from an appropriate nozzle 73 for core members 130 having different shapes.

[0072] In the adhesive application device 70 of the present embodiment, the sub-control device 85 controls to discharge the adhesive singly, intermittently or continuously for each nozzle 73 with respect to the lower surface WL of one core member 130. According to the above aspect, an appropriate amount of the adhesive can be discharged from an appropriate nozzle 73 according to the shape of the core member 130.

[0073] The adhesive application device 70 of the present embodiment does not include a recovery device for recovering the adhesive discharged from the nozzle 73. Since the sub-control device 85 can control the presence or absence of the discharge of the adhesive for each nozzle 73, it is possible to prevent unnecessary adhesive from being discharged from the nozzle 73. That is, since it is not necessary to provide a recovery device for recovering unnecessary adhesive, an increase in the size of the adhesive application device 70 can be suppressed.

[0074] In the adhesive application device 70 of the present embodiment, the cleaning device 88 is configured to clean the nozzle 73 when the adhesive is not being discharged from the nozzle 73. According to the above aspect, the nozzle 73 can be effectively cleaned.

[0075] In the adhesive application device 70 of the present embodiment, the sub-control device 85 causes the adhesive to be discharged from the nozzle 73 to the first adhesive application region 144 set according to the shape of the first core member 140 and the second adhesive application region 154 set according to the shape of the second core member 150 and at least partially different from the first adhesive application region 144. According to the above aspect, the adhesive can be applied to appropriate positions of the first core member 140 and the second core member 150 having different shapes.

[0076] In the adhesive application device 70 of the present embodiment, the sub-control device 85 is configured not to discharge the adhesive from all of the plurality of nozzles 73 to the lower surface WL of the core member 130 under predetermined conditions. For example, the sub-control device 85 does not apply the adhesive from all the nozzles 73 to the lower surface WL of the first core member 130 placed on the mounting table 35 among the core members 130.

[0077] In the adhesive application device 70 of the present embodiment, the sub-control device 85 is configured not to discharge the adhesive without blocking the nozzle 73 and the communication passage 75. According to the above aspect, since it is not necessary to separately provide a member for blocking the nozzle 73 or the communication passage 75, it is possible to suppress an increase in the size of the adhesive application device 70.

[0078] In the adhesive application device 70 of the present embodiment, the sub-control device 85 can adjust the thickness of the adhesive discharged from the nozzle 73 and applied to the lower surface WL of the core member 130 to 0.1 μm to 50 μm. According to the above aspect, since the thickness of the adhesive can be made relatively thin, it is possible to manufacture the laminated core 120 in which the occupation ratio of the core member 130 in the laminated core 120 is improved.

[0079] In the adhesive application device 70 of the present embodiment, the adhesive is any one of a thermosetting adhesive, an anaerobic adhesive, and a two-component curing adhesive. According to the above aspect, the core members 130 can be adhered more firmly to each other.

[0080] In the adhesive application device 70 of the present embodiment, the nozzle 73 is configured to be able to change the opening direction. According to the above aspect, since the direction in which the adhesive is discharged can be adjusted, the adhesive can be accurately applied to the lower surface WL of the core member 130.

[0081] In the adhesive application device 70 of the present embodiment, the direction in which the nozzle 73 opens when discharging the adhesive toward the lower surface WL of the core member 130 is different from the direction in which the nozzle 73 opens when filling the adhesive storage portion 74 with the adhesive. According to the above aspect, for example, when filling the adhesive storage portion 74 with the adhesive, even if the adhesive is accidentally discharged from the nozzle 73, it is possible to suppress the adhesion of the adhesive to the core member 130.

[0082] The adhesive application device 70 of the present embodiment has an inkjet head 71 having a plurality of nozzles 73. According to the above aspect, the adhesive can be easily discharged by the inkjet method.

[0083] The adhesive application device 70 of the present embodiment has a first inkjet head 71A having a plurality of nozzles 73 and a second inkjet head 71B having a plurality of nozzles 73. According to the above aspect, the adhesive can be applied to a wider range of the lower surface WL of the core member 130.

[0084] In the adhesive application device 70 of the present embodiment, in the width direction WD, a part of the first inkjet head 71A and a part of the second inkjet head 71B overlap. According to the above aspect, the adhesive can be applied to a wider range of the lower surface WL of the core member 130 in the width direction WD.

[0085] The adhesive application device 70 of the present embodiment includes an adhesive storage portion 74 for storing the adhesive and a heater 78 for heating the adhesive stored in the adhesive storage portion 74. According to the above aspect, since the viscosity of the adhesive can be stabilized, the adhesive can be accurately discharged.

[0086] In the manufacturing apparatus 10 for the laminated core of the present embodiment, the adhesive application device 70 is disposed between the second inner shape punching stage 25B and the outer shape punching stage 25D with respect to the conveyance direction FD of the metal plate W. According to the above aspect, the adhesive can be discharged from a predetermined nozzle 73 onto the lower surface WL of the core member 130 in accordance with the shape of the core member 130 having the inner shape formed therein.

[0087] In the manufacturing apparatus 10 for the laminated core of the present embodiment, the adhesive application device 70 is disposed closer to the second inner shape punching stage 25B than the center between the second inner shape punching stage 25B and the outer shape punching stage 25D with respect to the conveyance direction FD. According to the above aspect, since the space between the adhesive application device 70 and the outer shape punching stage 25D can be increased, the degree of freedom in the structure of the outer shape punching stage 25D is improved.

[0088] In the manufacturing apparatus 10 for the laminated core of the present embodiment, the adhesive application device 70 is disposed closer to the outer shape punching stage 25D than the center between the second inner shape punching stage 25B and the outer shape punching stage 25D with respect to the conveyance direction FD. According to the above aspect, the time required from the application of the adhesive to the punching of the outer shape can be shortened.

[0089] In the manufacturing apparatus 10 for the laminated core of the present embodiment, the detection device 65 is disposed between the adhesive application device 70 and the outer shape punching stage 25D with respect to the conveyance direction FD. According to the above aspect, an increase in the size of the manufacturing apparatus 10 in the conveyance direction FD can be suppressed.

[0090] In the manufacturing apparatus 10 for the laminated core of the present embodiment, when forming one core member 130, the metal plate W is configured to be intermittently conveyed in the conveyance direction FD through the first region P1 where the first inner shape punching stage 25A is disposed, the second region P2 where the adhesive application device 70 and the detection device 65 are disposed, and the third region P3 where the outer shape punching stage 25D is disposed in this order. According to the above aspect, an increase in the size of the manufacturing apparatus 10 in the conveyance direction FD can be suppressed.

[0091] In the manufacturing apparatus 10 of the laminated core according to the present embodiment, the adhesive application device 70 is configured to apply an adhesive to the lower surface WL of the core member 130 during the conveyance of the metal plate W. According to the above aspect, the laminated core 120 can be manufactured more quickly.

[0092] In the manufacturing apparatus 10 of the laminated core according to the present embodiment, the sub-control device 85 is configured to send a discharge start signal of the adhesive to the nozzle 73 before starting the conveyance of the metal plate W. According to the above aspect, the adhesive can be discharged from the nozzle 73 without delay with respect to the conveyance of the metal plate W.

[0093] In the manufacturing apparatus 10 of the laminated core according to the present embodiment, the sub-control device 85 is configured to send a discharge stop signal of the adhesive to the nozzle 73 before stopping the conveyance of the metal plate W. According to the above aspect, since the discharge of the adhesive from the nozzle 73 can be stopped together with the stop of the conveyance of the metal plate W, it is possible to suppress excessive discharge of the adhesive.

[0094] In the manufacturing apparatus 10 of the laminated core according to the present embodiment, in the width direction WD, a part of the first inkjet head 71A and a part of the second inkjet head 71B overlap. According to the above aspect, the adhesive can be applied to a wider range of the lower surface WL of the core member 130 in the width direction WD.

[0095] In the manufacturing apparatus 10 of the laminated core according to the present embodiment, the plurality of nozzles 73 of the first inkjet head 71A and the plurality of nozzles 73 of the second inkjet head 71B are arranged at equal intervals in the width direction WD. According to the above aspect, the adhesive can be applied to the lower surface WL of the core member 130 without unevenness.

[0096] In the method for manufacturing the laminated core of the present embodiment, in the coating step, for each of the plurality of nozzles 73 capable of discharging the granular adhesive, the presence or absence of the discharge of the adhesive is controlled so that at least one of the states where a plurality of dot-shaped adhesives are independently applied to the lower surface WL of the core member 130 and the state where at least a part of the plurality of dot-shaped adhesives are applied overlapping each other is achieved. Thus, since the presence or absence of the discharge of the adhesive can be controlled for each nozzle 73, the adhesive can be discharged from a predetermined nozzle 73 onto the lower surface WL of the core member 130 according to the shape of the core member 130. That is, the adhesive can be discharged from an appropriate nozzle 73 for core members 130 having different shapes.

[0097] In the method for manufacturing the laminated core of the present embodiment, in the coating step, for the lower surface WL of one core member 130, it is controlled so that the adhesive is discharged from each nozzle 73 singly, intermittently or continuously. According to the above aspect, an appropriate amount of the adhesive can be discharged from an appropriate nozzle 73 according to the shape of the core member 130.

[0098] The method for manufacturing the laminated core of the present embodiment further includes a cleaning step of cleaning the nozzle 73 when the adhesive is not being discharged from the nozzle 73. According to the above aspect, the nozzle 73 can be effectively cleaned.

[0099] In the method for manufacturing the laminated core of the present embodiment, in the coating step, the adhesive is discharged from the nozzle 73 to the first adhesive coating region 144 set according to the shape of the first core member 140 and the second adhesive coating region 154 set according to the shape of the second core member 150 and at least partially different from the first adhesive coating region 144. According to the above aspect, the adhesive can be applied to appropriate positions of the first core member 140 and the second core member 150 having different shapes.

[0100] In the method for manufacturing the laminated core of the present embodiment, a non-application step of not discharging the adhesive from all of the plurality of nozzles 73 with respect to the lower surface WL of the core member 130 is further included. The non-application step is performed, for example, only on the first core member 130 placed on the mounting table 35 among the core members 130.

[0101] In the method for manufacturing the laminated core of the present embodiment, the thickness of the adhesive discharged from the nozzle 73 and applied to the lower surface WL of the core member 130 is 0.1 μm to 50 μm. According to the above aspect, since the thickness of the adhesive can be made relatively thin, a laminated core 120 with an improved occupation ratio of the core member 130 in the laminated core 120 can be manufactured.

[0102] In the method for manufacturing the laminated core of the present embodiment, the adhesive is any one of a thermosetting adhesive, an anaerobic adhesive, and a two-component curing adhesive. According to the above aspect, the core members 130 can be adhered to each other more firmly.

[0103] In the method for manufacturing the laminated core of the present embodiment, the direction in which the nozzle 73 opens is configured to be changeable. According to the above aspect, since the direction in which the adhesive is discharged can be adjusted, the adhesive can be accurately applied to the lower surface WL of the core member 130.

[0104] In the method for manufacturing the laminated core of the present embodiment, the direction in which the nozzle 73 opens when discharging the adhesive from the nozzle 73 toward the lower surface WL of the core member 130 is different from the direction in which the nozzle 73 opens when filling the adhesive accommodating portion 74 that communicates with the nozzle 73 and accommodates the adhesive with the adhesive. According to the above aspect, for example, when filling the adhesive into the adhesive accommodating portion 74, it is possible to suppress the adhesive from adhering to the core member 130 even if the adhesive is accidentally discharged from the nozzle 73.

[0105] In the method for manufacturing the laminated core of the present embodiment, when the core member 130 is formed by punching the metal plate W with the punch 45, in the coating step, an adhesive is applied to the lower surface WL of the core member 130 during the conveyance of the metal plate W. According to the above aspect, the laminated core 120 can be manufactured more quickly.

[0106] In the method for manufacturing the laminated core of the present embodiment, before starting the conveyance of the metal plate W, it is configured to send a discharge start signal of the adhesive to the nozzle 73. According to the above aspect, the adhesive can be discharged from the nozzle 73 without delay with respect to the conveyance of the metal plate W.

[0107] In the method for manufacturing the laminated core of the present embodiment, before stopping the conveyance of the metal plate W, it is configured to send a discharge stop signal of the adhesive to the nozzle 73. According to the above aspect, since the discharge of the adhesive from the nozzle 73 can be stopped together with the stop of the conveyance of the metal plate W, it is possible to suppress excessive discharge of the adhesive.

[0108] The preferred embodiments of the present invention have been described above. However, the above-described embodiments are merely examples, and the present invention can be implemented in various other forms.

[0109] In the above-described embodiment, the manufacturing apparatus 10 includes the first inner shape punching stage 25A and the second inner shape punching stage 25B, but it may include only one of them. For example, when the manufacturing apparatus 10 includes the first inner shape punching stage 25A, the adhesive application apparatus 70 can apply the adhesive in accordance with various inner shapes of the core member 130 formed at the first inner shape punching stage 25A. That is, it is not necessary to change the configuration of the adhesive application apparatus according to the inner shape of the core member 130.

[0110] In the above-described embodiment, the adhesive was applied to the lower surface WL of the core member 130, but the adhesive may be applied to the upper surface of the core member 130. For example, in the application step (step S40), the adhesive may be applied to the upper surface of the first core member 140 (core member 130) formed on the metal plate W from the adhesive application device 70. In this case, when forming the first core member 130, the adhesive is applied to the upper surface of the core member 130. On the other hand, when forming the last core member 130 of the core members 130 placed on the mounting table 35, it is not necessary to apply the adhesive to the upper surface of the last core member 130. Therefore, when manufacturing the last core member 130, a non-application process is performed. In the non-application process, the adhesive is not discharged from all of the plurality of nozzles 73 onto the upper surface of the core member 130. When applying the adhesive to the upper surface of the core member 130, for example, the adhesive application device 70 is located above the metal plate W. The adhesive application device 70 is provided, for example, on the upper mold 40.

Explanation of Signs

[0111] 10 Manufacturing apparatus (manufacturing apparatus for laminated core) 20 Lower mold 25A First inner shape punching stage 25B Second inner shape punching stage 25C Adhesive application stage 25D Outer shape punching stage 40 Upper mold 65 Detection device 70 Adhesive application device 71 Inkjet head 71A First inkjet head 71B Second inkjet head 71C Third inkjet head 73 Nozzle 74 Adhesive storage part 75 Communication path 78 Heater 85 Sub-control device 88 Cleaning device

Claims

1. An adhesive application device used in a manufacturing apparatus for a laminated core in which a plurality of core members are laminated and adhered to each other, the adhesive application device for applying an adhesive to the core member, a plurality of nozzles capable of discharging the granular adhesive, a first inkjet head having a plurality of the nozzles, a second inkjet head having a plurality of the nozzles, a control device capable of controlling the discharge of the adhesive for each of the nozzles, comprising: the first inkjet head and the second inkjet head are arranged side by side in the conveying direction of the metal plate, in a direction intersecting the conveying direction in a plan view, a part of the first inkjet head and a part of the second inkjet head overlap, the control device is configured to control the presence or absence of discharge of the adhesive for each of the nozzles so that the core member is in at least one of a state in which a plurality of dot-like adhesives are applied independently of each other and a state in which at least a part of the plurality of dot-like adhesives overlap and are applied. An adhesive application device.

2. The control device controls the discharge of the adhesive for each of the nozzles in a single shot, intermittently, or continuously with respect to one core member. The adhesive application device according to claim 1.

3. The adhesive application device according to claim 1, which does not include a recovery device for recovering the adhesive discharged from the nozzle.

4. A cleaning device for cleaning the nozzles is provided, The cleaning device is configured to clean the nozzles when the adhesive is not being discharged from the nozzles. The adhesive application device according to claim 1.

5. When a plurality of core members include a first core member having a first shape and a second core member having a second shape, the control device discharges the adhesive from the nozzles to a first adhesive application region set according to the shape of the first core member and a second adhesive application region set according to the shape of the second core member and at least partially different from the first adhesive application region. The adhesive application device according to claim 1.

6. The control device is configured not to discharge the adhesive from all of the plurality of nozzles to the core member under predetermined conditions. The adhesive application device according to claim 1.

7. an adhesive storage section for storing the adhesive, A communication path that communicates the nozzle and the adhesive storage part, and The control device is configured not to discharge the adhesive without closing the nozzle and the communication path. The adhesive application device according to claim 6.

8. The control device can adjust the thickness of the adhesive discharged from the nozzle and applied to the core member to 0.1 μm to 50 μm. The adhesive application device according to claim 1.

9. The adhesive is any one of a thermosetting adhesive, an anaerobic adhesive, and a two-component curing adhesive. The adhesive application device according to claim 1.

10. The nozzle is configured to be able to change the opening direction. The adhesive application device according to claim 1.

11. An adhesive storage part for storing the adhesive, A communication path that communicates the nozzle and the adhesive storage part, and When discharging the adhesive from the nozzle toward the core member, the opening direction of the nozzle is different from the opening direction of the nozzle when filling the adhesive storage part with the adhesive, The opening direction of the nozzle when filling the adhesive storage part with the adhesive is vertically downward. The adhesive application device according to claim 1.

12. An adhesive storage part for storing the adhesive, A heater for heating the adhesive stored in the adhesive storage part. The adhesive application device according to claim 1.

13. The adhesive application device according to any one of claims 1 to 12, A lower die having a die with a die hole formed therein, An upper die having a punch corresponding to the die hole and punching a metal plate. The manufacturing device for a laminated core includes: The lower die is An inner shape punching stage in which the metal plate is punched to form the inner shape of the core member, An outer shape punching stage in which the metal plate is punched to form the outer shape of the core member. The manufacturing device for a laminated core includes: The adhesive application device is disposed between the inner shape punching stage and the outer shape punching stage with respect to the conveyance direction of the metal plate.

14. The adhesive application device is disposed closer to the inner shape punching stage than the center between the inner shape punching stage and the outer shape punching stage with respect to the conveyance direction. The manufacturing device according to claim 13.

15. The adhesive application device is arranged on the outer shape punching stage side rather than the center between the inner shape punching stage and the outer shape punching stage with respect to the conveying direction, and the manufacturing apparatus according to claim 13.

16. It is provided with a detection device for detecting the adhesive applied to the iron core member, The detection device is arranged between the adhesive application device and the outer shape punching stage with respect to the conveying direction, and the manufacturing apparatus according to claim 13.

17. When forming one of the iron core members, the metal plate is configured to be intermittently conveyed in the conveying direction in this order through a first region where the inner shape punching stage is arranged, a second region where the adhesive application device and the detection device are arranged, and a third region where the outer shape punching stage is arranged, and the manufacturing apparatus according to claim 16.

18. The adhesive application device is configured to apply an adhesive to the iron core member during the conveyance of the metal plate, and the manufacturing apparatus according to claim 13.

19. The control device is configured to send a discharge start signal of the adhesive to the nozzle before starting the conveyance of the metal plate, and the manufacturing apparatus according to claim 18.

20. The control device is configured to send a discharge stop signal of the adhesive to the nozzle before stopping the conveyance of the metal plate, and the manufacturing apparatus according to claim 18.

21. An adhesive application device used in a manufacturing apparatus for a laminated iron core in which a plurality of iron core members are laminated and adhered to each other, the adhesive application device for applying an adhesive to the iron core member, A lower die having a die with a die hole formed therein, An upper die having a punch corresponding to the die hole and punching a metal plate, and is provided with, The lower die, An inner shape punching stage where the metal plate is punched to form the inner shape of the iron core member, An outer shape punching stage where the metal plate is punched to form the outer shape of the iron core member, and has, The adhesive application device is arranged between the inner shape punching stage and the outer shape punching stage with respect to the conveying direction of the metal plate, The adhesive application device, A plurality of nozzles capable of discharging the granular adhesive, A control device capable of controlling the discharge of the adhesive for each nozzle, and is provided with, The control device is configured to control the presence or absence of ejection of the adhesive for each nozzle so that the core member is in at least one of a state in which a plurality of dot-like adhesives are applied independently of each other and a state in which at least a part of the plurality of dot-like adhesives are applied overlapping each other. It has a first inkjet head having a plurality of the nozzles and a second inkjet head having a plurality of the nozzles. The first inkjet head and the second inkjet head are arranged side by side in the conveyance direction. A manufacturing apparatus in which a part of the first inkjet head and a part of the second inkjet head overlap in a direction intersecting the conveyance direction in a plan view.

22. The manufacturing apparatus according to claim 21, wherein the plurality of nozzles of the first inkjet head and the plurality of nozzles of the second inkjet head are arranged at equal intervals in a direction intersecting the conveyance direction in a plan view.

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