Laminated iron core, manufacturing method of laminated iron core, and progressive die device

Abstract

To provide a laminated core, a method for manufacturing the laminated core, and a progressive mold device to suppress adhesion of an adhesive to a lifter.SOLUTION: A laminated core includes a plurality of laminated core pieces and an adhesive that causes the adjacent core pieces to adhere to each other. The core piece has an annular yoke portion and a plurality of teeth portions that protrude from the yoke portion along a radial direction. The adhesive is arranged at different radial distances from a central axis of the core piece and evenly in a circumferential direction in at least one of the entire yoke portion or the entire teeth portion.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The disclosed embodiments relate to a laminated core, a method for manufacturing a laminated core, and a progressive die device. [Background technology]

[0002] There is known a manufacturing device for a laminated core that laminates core pieces formed by punching out a strip-shaped electromagnetic steel sheet into a predetermined shape using a die. In such a manufacturing device, for example, a technique is disclosed in which an adhesive is applied to predetermined positions on the underside of the electromagnetic steel sheet, and then the core pieces are punched out (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5160862 Summary of the Invention [Problem to be solved by the invention]

[0004] Meanwhile, electromagnetic steel sheets used in laminated cores are becoming thinner in response to the need for higher motor efficiency. To prevent a portion of the electromagnetic steel sheet from sagging during transportation during punching and interfering with the die, a known configuration is to support the underside of the electromagnetic steel sheet with a lifter and transport the electromagnetic steel sheet while lifting it from the die.

[0005] However, when an electromagnetic steel sheet coated with adhesive is lifted with a lifter, there is a risk that the adhesive coated on the underside of the electromagnetic steel sheet will adhere to the lifter.

[0006] One aspect of the embodiment has been made in consideration of the above, and aims to provide a laminated iron core, a method for manufacturing a laminated iron core, and a progressive die device that can suppress adhesion of adhesive to the lifter. [Means for solving the problem]

[0007] According to one aspect of the present invention, a laminated core includes a plurality of laminated core pieces and an adhesive that bonds adjacent core pieces together. The core pieces have an annular yoke portion and a plurality of teeth that protrude radially from the yoke portion. The adhesive is disposed at different radial distances from the central axis of the core pieces and evenly distributed circumferentially over at least one of the entire yoke portion and the entire teeth.

[0008] Furthermore, a manufacturing method of a laminated core according to one aspect of the embodiment includes a forwarding step, an applying step, a forming step, and a stacking step. In the forwarding step, a metal plate is forwarded in a predetermined direction while the lower surface of the metal plate is supported by a plurality of lifters. In the applying step, an adhesive is applied to core piece regions on the lower surface of the metal plate that will become core pieces having an annular yoke portion and a plurality of teeth protruding radially from the yoke portion. In the forming step, the core pieces are formed by punching the core piece regions. In the stacking step, a plurality of the core pieces are stacked while adjoining adjacent core pieces with the adhesive. In the applying step, the adhesive is applied to at least one of the entire yoke portion or the entire tooth portion at different radial distances from the central axis of the core piece and evenly distributed in the circumferential direction, and regions of the core pieces where the adhesive is not applied are arranged along the predetermined direction. In the step of feeding the metal plate forward, the lower surface of the metal plate is supported by a plurality of the lifters so that at least one of the lifters passes through the region.

[0009] Also, a progressive die device according to one aspect of the embodiment includes an upper die, a lower die, multiple lifters, and an application unit. The upper die and the lower die press a strip-shaped metal plate that is fed progressively in a predetermined direction to form an iron core piece having an annular yoke portion and multiple teeth protruding radially from the yoke portion. The multiple lifters are provided on the lower die and support the underside of the metal plate as the metal plate is fed progressively. The application unit is provided on the lower die and applies adhesive to the underside of the metal plate. The application unit applies the adhesive to the underside of the metal plate so that the adhesive is distributed evenly around the circumferential direction at different radial distances from the central axis of the iron core piece over at least one of the entire yoke portion or the entire tooth portion, and so that regions of the iron core piece where the adhesive is not applied are arranged along the predetermined direction. At least one of the lifters supports the underside of the metal plate so as to pass through the regions. [Effects of the Invention]

[0010] According to one aspect of the embodiment, adhesion of adhesive to the lifter can be suppressed. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing an example of a laminated core according to an embodiment. [Figure 2] FIG. 2 is a schematic diagram showing an example of a manufacturing apparatus for a laminated iron core according to the embodiment. [Figure 3] FIG. 3 is a schematic cross-sectional view showing an example of a press working device according to an embodiment. [Figure 4] FIG. 4 is a plan view showing an example of a lower mold according to the embodiment. [Figure 5] FIG. 5 is a flowchart showing an example of the procedure of each manufacturing process executed by the stamping device according to the embodiment. [Figure 6] FIG. 6 is a bottom view showing an example of an electromagnetic steel sheet to be punched by the stamping device according to the embodiment. [Figure 7]FIG. 7 is a bottom view showing an example of an electromagnetic steel sheet to be punched by the stamping device according to the first modification of the embodiment. [Figure 8] FIG. 8 is a bottom view showing an example of an electromagnetic steel sheet to be punched by a stamping device according to a second modification of the embodiment. [Figure 9] FIG. 9 is a bottom view showing an example of an electromagnetic steel sheet to be punched by a stamping device according to a third modification of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, a laminated core, a manufacturing method of a laminated core, and a progressive die device disclosed in the present application will be described with reference to the accompanying drawings. Note that the present disclosure is not limited to the following embodiments.

[0013] It should also be noted that the drawings are schematic and that the dimensional relationships and ratios of elements may differ from reality. Furthermore, the drawings may contain parts whose dimensional relationships and ratios differ from one another.

[0014] <Laminated iron core> First, the configuration of a laminated core 1 according to an embodiment will be described with reference to Fig. 1. Fig. 1 is a perspective view showing an example of a laminated core 1 according to an embodiment. The laminated core 1 is, for example, a stator laminated core, and is part of a stator.

[0015] The stator is a laminated core 1 to which windings are attached. A motor is constructed by combining the stator with a rotor.

[0016] 1, the laminated core 1 has, for example, a cylindrical shape. That is, a through hole 1a (center hole) extending along the central axis Ax is provided in the central portion of the laminated core 1. A rotor can be placed inside the through hole 1a.

[0017] The laminated core 1 is a laminated body formed by stacking a plurality of core pieces W. The core pieces W are plate-like bodies obtained by punching out strip-shaped electromagnetic steel sheets MS (see FIG. 2) into a predetermined shape.

[0018] The laminated core 1 according to the embodiment may be constructed by so-called "rotation." This "rotation" refers to stacking multiple core pieces W while shifting the angles between the core pieces W relative to each other. Rotation is performed primarily for the purpose of offsetting the thickness deviation of the laminated core 1. The rotation angle may be set to any size.

[0019] The core pieces W and the laminated core 1 each have a yoke portion 2 and a plurality of teeth 3. The yoke portion 2 is annular (for example, circular) and extends to surround the central axis Ax. The radial width, inner diameter, outer diameter, and thickness of the yoke portion 2 can each be set to various values ​​depending on the application and performance of the motor.

[0020] Each tooth 3 extends radially from the inner edge of the yoke 2 toward the central axis Ax. That is, each tooth 3 protrudes radially from the inner edge of the yoke 2.

[0021] For example, in the example shown in Fig. 1, twelve teeth 3 are formed integrally with the yoke 2. The teeth 3 are arranged at approximately equal intervals in the circumferential direction of the yoke 2. Slots 4 are defined between adjacent teeth 3, which function as spaces for arranging windings (not shown).

[0022] Furthermore, the iron core pieces W adjacent to each other in the height direction are joined together by an adhesive B (see FIG. 6). Details of the adhesive B will be described later.

[0023] <Manufacturing equipment> Next, a laminated core manufacturing apparatus 100 according to an embodiment will be described with reference to Fig. 2. Fig. 2 is a schematic diagram showing an example of the laminated core manufacturing apparatus 100 according to an embodiment. The manufacturing apparatus 100 according to an embodiment is configured to manufacture a laminate 10 (see Fig. 3) of core pieces W (see Fig. 1) from a strip-shaped electromagnetic steel sheet MS.

[0024] In order to facilitate understanding, the drawings referred to below may show an orthogonal coordinate system in which the X-axis direction, Y-axis direction, and Z-axis direction, which are perpendicular to each other, are defined, the positive Z-axis direction is the vertically upward direction, the positive X-axis direction is the forward feed direction of the electromagnetic steel sheet MS, and the Y-axis is the width direction of the electromagnetic steel sheet MS.

[0025] 2, the manufacturing apparatus 100 includes an uncoiler 110, a feed device 120, a press working device 130, and a controller Ctr (control unit). The press working device 130 is an example of a progressive die device.

[0026] The uncoiler 110 is configured to rotatably hold the coil material 111. The coil material 111 is an electromagnetic steel sheet MS wound in a coil shape (spiral shape). The electromagnetic steel sheet MS is an example of a metal sheet.

[0027] The feed-out device 120 has a pair of rollers 121, 122 that sandwich the electromagnetic steel sheet MS from above and below. The pair of rollers 121, 122 are configured to rotate and stop based on command signals from the controller Ctr, and to intermittently and sequentially feed out the electromagnetic steel sheet MS toward the press processing device 130 (hereinafter also referred to as "progressive feeding"). In other words, the pair of rollers 121, 122 function as a conveying means for conveying the electromagnetic steel sheet MS.

[0028] The stamping device 130 is configured to operate based on an instruction signal from the controller Ctr. The stamping device 130, for example, operates a plurality of punches P1 to P4 (see FIG. 3) to sequentially perform press working (for example, punching or half-blanking) on ​​the electromagnetic steel sheet MS delivered by the delivery device 120. In this way, the stamping device 130 is configured to form a plurality of iron core pieces W.

[0029] The press working device 130 has a lower die 140, an upper die 150, and a press machine 160. The lower die 140 is positioned below the electromagnetic steel sheet MS being fed forward and supports the electromagnetic steel sheet MS from below. The upper die 150 is positioned above the electromagnetic steel sheet MS being fed forward and presses the electromagnetic steel sheet MS by moving up and down. Details of the lower die 140 and the upper die 150 will be described later.

[0030] The press 160 is located above the upper die 150. The piston of the press 160 is connected to a punch holder 151 (see FIG. 3) that holds a plurality of punches provided in the upper die 150, and operates based on a command signal from the controller Ctr. When the press 160 operates, the piston expands and contracts, causing the entire upper die 150 to move up and down.

[0031] The controller Ctr is configured to generate instruction signals for operating the sending device 120 and the press working device 130 based on, for example, a program recorded on a recording medium (not shown) or an operation input from an operator. The controller Ctr is configured to transmit these instruction signals to the sending device 120 and the press working device 130, respectively.

[0032] <Press processing equipment> Next, details of the press processing apparatus 130 according to the embodiment will be described with reference to Fig. 3 and Fig. 4. Fig. 3 is a schematic cross-sectional view showing an example of the press processing apparatus 130 according to the embodiment, and Fig. 4 is a plan view showing an example of the lower mold 140 according to the embodiment.

[0033] For ease of understanding, FIG. 4 shows the lower die 140 corresponding to the final part of the punching process, as well as the positions of the electromagnetic steel sheet MS passing above the lower die 140.

[0034] 3, the press working device 130 includes a lower die 140, an upper die 150, and a press 160. The lower die 140 includes a base 141, a die holder 142, die members D1 to D4, a coating unit 143, a plurality of guide posts 144, and a conveying mechanism 145.

[0035] The base 141 is fixed to, for example, the floor surface and functions as a foundation for the entire press processing device 130. The die holder 142 is supported on the base 141. A plurality of discharge holes C1 to C4 are formed in the die holder 142. The die holder 142 may be made of, for example, a steel material (raw material) that has not been subjected to heat treatment such as quenching.

[0036] The plurality of discharge holes C1 to C4 extend, for example, in the vertical direction inside the die holder 142. Materials (for example, iron core pieces W and waste materials) punched out from the electromagnetic steel sheet MS are discharged from the plurality of discharge holes C1 to C4.

[0037] The die members D1 to D4 are attached to the upper part of the die holder 142 so as to be adjacent to each other in the conveyance direction of the electromagnetic steel sheet MS. The die members D1 to D4 are lined up in this order from the upstream side to the downstream side in the conveyance direction of the electromagnetic steel sheet MS. In addition, a coating unit 143 is provided between the die member D3 and the die member D4.

[0038] The die members D1 to D3 basically have the same configuration. The die member D1 has a die plate D11 and a die D12. The die plate D11 is configured to hold the die D12 in a through hole formed in the center. The die plate D11 is made of a steel material that has been subjected to heat treatment such as quenching.

[0039] The die D12 is made of, for example, a cemented carbide alloy containing tungsten carbide. The die D12 has a die hole D13 formed therethrough in the vertical direction. The die hole D13, together with the punch P1 of the upper mold 150, constitutes a unit for punching the electromagnetic steel sheet MS.

[0040] The die hole D13 also communicates with a discharge hole C1 of the die holder 142. By inserting and removing the punch P1 into the die hole D13, the electromagnetic steel sheet MS is punched out in a shape that follows the outline of the die hole D13. The metal piece punched out of the electromagnetic steel sheet MS is discharged to the outside of the stamping device 130 through the discharge hole C1.

[0041] The die member D2 has a die plate D21 and a die D22. The die plate D21 is configured to hold the die D22 in a through hole formed in the center. The materials of the die plate D21 and the die D22 may be the same as the materials of the die plate D11 and the die D12, respectively.

[0042] The die D22 is formed with a die hole D23 that penetrates in the vertical direction. The die hole D23, together with the punch P2 of the upper die 150, constitutes a unit for punching out the electromagnetic steel sheet MS.

[0043] The die hole D23 also communicates with the discharge hole C2 of the die holder 142. By inserting and removing the punch P2 into the die hole D23, the electromagnetic steel sheet MS is punched out in a shape that follows the outline of the die hole D23. The metal piece punched out of the electromagnetic steel sheet MS is discharged to the outside of the stamping device 130 through the discharge hole C2.

[0044] The die member D3 has a die plate D31 and a die D32. The die plate D31 is configured to hold the die D32 in a through hole formed in the center. The materials of the die plate D31 and the die D32 may be the same as the materials of the die plate D11 and the die D12, respectively.

[0045] The die D32 is formed with a die hole D33 that penetrates in the vertical direction. The die hole D33, together with the punch P3 of the upper die 150, constitutes a unit for punching out the electromagnetic steel sheet MS.

[0046] The die hole D33 also communicates with the discharge hole C3 of the die holder 142. By inserting and removing the punch P3 into the die hole D33, the electromagnetic steel sheet MS is punched out in a shape that follows the outline of the die hole D33. The metal piece punched out of the electromagnetic steel sheet MS is discharged to the outside of the stamping device 130 through the discharge hole C3.

[0047] In the present disclosure, for example, by punching using die members D1 to D3, through holes in the core pieces W corresponding to the through holes 1a (see FIG. 2) and recesses in the core pieces W corresponding to the slots 4 (see FIG. 2) are formed in the electromagnetic steel sheet MS.

[0048] The coating unit 143 has a function of coating the adhesive B (see FIG. 6) onto the lower surface MS1 (see FIG. 6) of the electromagnetic steel sheet MS. As shown in FIG. 4, the coating unit 143 is a rectangular plate-like body, and can be placed on the die holder 142 in the same way as the die members D1 to D4.

[0049] Furthermore, a plurality of outlets 147 that discharge adhesive B are formed on the surface of the application unit 143. The outlets 147 are arranged, for example, in a substantially circular ring shape in a plan view, and are arranged so that adhesive B is applied to the core piece region R that corresponds to the core piece W. The specific arrangement of adhesive B in such core piece region R will be described later.

[0050] 3, a supply path L1 is provided inside the application unit 143, connected to the discharge port 147 and supplying adhesive B to the discharge port 147. An end 148 of the supply path L1 opposite to the discharge port 147 side is connected to a tank 149 provided outside via a pipe L2.

[0051] A pump P is provided in the pipe L2 between the tank 149 and the end portion 148. The pump P is driven, for example, based on instructions from the controller Ctr, to supply the adhesive B from the tank 149 to the coating unit 143. The adhesive B supplied to the coating unit 143 is discharged through a supply path L1 and from a plurality of discharge ports 147 toward the lower surface MS1 of the electromagnetic steel sheet MS.

[0052] The die member D4 has a die plate D41, a die D42, a rotating body D44, and a drive mechanism D45. The die plate D41 is configured to hold the die D42 supported by the rotating body D44 within a through hole formed in the center.

[0053] The rotating body D44 is provided between the die plate D41 and the die D42. The rotating body D44 is held so as to be rotatable around a central axis extending along the vertical direction relative to the die plate D41.

[0054] The die D42 is supported by a rotor D44. As a result, the die D42, while supported by the rotor D44, can rotate about a central axis extending along the vertical direction relative to the die plate D41. The material of the die plate D41 may be the same as the material of the die plate D11, and the material of the die D42 and the rotor D44 may be the same as the material of the die D12.

[0055] The die D42 has a die hole D43 that penetrates in the vertical direction. The die hole D43, together with the punch P4 of the upper mold 150, constitutes a unit for punching out the electromagnetic steel sheet MS. When this unit punches out the electromagnetic steel sheet MS, an iron core piece W is formed from the electromagnetic steel sheet MS. The die hole D43 has, for example, a circular shape as a whole.

[0056] The die hole D43 communicates with the discharge hole C4 of the die holder 142. By inserting and removing the punch P4 into the die hole D43, the electromagnetic steel sheet MS is punched out into a shape that follows the outline of the die hole D43. The core piece W punched out from the electromagnetic steel sheet MS is stacked in the die hole D43 on the previously punched core piece W.

[0057] At this time, the iron core piece W punched out from the electromagnetic steel sheet MS is adhered to the previously punched iron core piece W by the adhesive B applied to its underside MS1. When a predetermined number of iron core pieces W are stacked in the die hole D43, the obtained laminate 10 is placed on the conveying mechanism 145 through the discharge hole C4.

[0058] The driving mechanism D45 is connected to the rotating body D44. The driving mechanism D45 rotates the rotating body D44 around the central axis of the rotating body D44 and the die D42 based on an instruction signal from the controller Ctr.

[0059] This allows the controller Ctr to rotate the core pieces W punched out from the electromagnetic steel sheet MS onto the previously stacked core pieces W. In other words, the rotating body D44 and the drive mechanism D45 function as a rotating means for rotating the core pieces W. The drive mechanism D45 is configured by a combination of, for example, a rotary motor, gears, a timing belt, etc.

[0060] 3, the plurality of guide posts 144 extend linearly upward from the die holder 142. The plurality of guide posts 144, together with the guide bush 151a, are configured to guide the upper die 150 in the up and down direction. Note that the plurality of guide posts 144 may be attached to the upper die 150 so as to extend downward from the upper die 150.

[0061] The transport mechanism 145 operates based on instructions from the controller Ctr and is configured to send the laminate 10 dropped from the die D42 to a subsequent device (for example, a magnet mounting device, a resin injection device, a welding device, a shaft mounting device, etc.).

[0062] One end of the transport mechanism 145 is located inside the discharge hole C4, and the other end of the transport mechanism 145 is located outside the press working device 130. The transport mechanism 145 is, for example, a belt conveyor.

[0063] 3, the die plates D11 to D41 and the coating unit 143 have flat surfaces. Furthermore, the die plates D11 to D41 and the coating unit 143 are provided with lifters 146 that protrude upward from the surfaces thereof.

[0064] The lifter 146 is provided to support the electromagnetic steel sheet MS transported on the die plates D11 to D41 and the coating unit 143 while keeping it spaced apart from the surfaces of the die plates D11 to D41 and the coating unit 143.

[0065] There is no particular limitation on the arrangement of the lifters 146. In Fig. 4, the electromagnetic steel sheets MS transported on the die members are shown by dashed lines, but as an example, the lifters 146 can be provided near both ends of the electromagnetic steel sheets MS transported on the die plates D31 and D41.

[0066] 4, a plurality of lifters 146 are arranged, for example, along a direction D in which the electromagnetic steel sheets MS are fed forward. The direction D is an example of a predetermined direction.

[0067] When punching of the electromagnetic steel sheet MS is performed by the up and down movement of the upper die 150, the upper end of the lifter 146 can be at the same height as the surfaces of the die plates D11 to D41 and the coating unit 143. The lifter 146 can be configured to be able to move up and down, for example, by supporting a pin extending in the up and down direction with an elastic member provided below the pin.

[0068] With this configuration, when the electromagnetic steel sheet MS is transported, the lifter 146, which is not biased by the upper die 150, extends upward, so that the lifter 146 can support the electromagnetic steel sheet MS while keeping it away from the surfaces of the die plates D11 to D41 and the coating unit 143.

[0069] On the other hand, when punching is performed on the electromagnetic steel sheet MS, the lifter 146 biased by the upper die 150 moves downward, and the electromagnetic steel sheet MS is pressed against the surfaces of the die plates D11 to D41 and the coating unit 143. Note that the lifter 146 is not limited to the above configuration.

[0070] 4, a plurality of pilot holes H1 are formed on the surfaces of the die plates D11 to D41 and the coating unit 143. The plurality of pilot holes H1 are formed so as to extend vertically inside the die plates D11 to D41 and the coating unit 143.

[0071] The pilot holes H1 are holes that serve as references for positioning the electromagnetic steel sheets MS with pilot pins (not shown) provided on the upper die 150 when the electromagnetic steel sheets MS are punched out by the punches P1 to P4.

[0072] In the example of Figure 3, an example is shown in which the die members D1 to D3, the coating unit 143, and the die member D4 are integrally configured, but the present disclosure is not limited to such an example, and the die members D1 to D3, the coating unit 143, and the die member D4 may each be configured separately.

[0073] The upper die 150 has a punch holder 151, a stripper 152, and a plurality of punches P1 to P4. The punch holder 151 is disposed above the die holder 142 so as to face the die holder 142. The punch holder 151 is configured to hold the plurality of punches P1 to P4 on its lower surface side.

[0074] A plurality of guide bushes 151a are provided in the punch holder 151. The plurality of guide bushes 151a are positioned so as to correspond to the plurality of guide posts 144, respectively. The guide bushes 151a are, for example, cylindrical, and the guide posts 144 can be inserted through the internal space of the guide bushes 151a. Note that when the guide posts 144 are attached to the upper die 150, the guide bushes 151a may be provided in the lower die 140.

[0075] A plurality of through holes 151b are formed in the punch holder 151. Steps are formed on the inner peripheral surfaces of the through holes 151b, so that the diameter of the upper part of the through holes 151b is set larger than the diameter of the lower part of the through holes 151b.

[0076] The stripper 152 is configured to remove the electromagnetic steel sheet MS that has bitten into the punches P1 to P4 from the punches P1 to P4 when the electromagnetic steel sheet MS is punched out by the punches P1 to P4. At the same time, the stripper 152 is configured to press the electromagnetic steel sheet MS against the die plates D11 to D41 and the coating unit 143 when the electromagnetic steel sheet MS is punched out by the punches P1 to P4.

[0077] The stripper 152 presses the electromagnetic steel sheet MS against the coating unit 143, whereby the adhesive B discharged from the discharge port 147 is applied to a predetermined position on the lower surface MS1 of the electromagnetic steel sheet MS. The stripper 152 is disposed between the die members D1 to D4 and the coating unit 143 and the punch holder 151.

[0078] The stripper 152 is connected to the punch holder 151 via a connecting member 152a. The connecting member 152a has an elongated main body and a head provided at the upper end of the main body. The main body of the connecting member 152a is inserted into the lower part of the through-hole 151b and can move up and down within the through-hole 151b.

[0079] The lower end of the main body of the connecting member 152a is fixed to the stripper 152. A biasing member 152b such as a compression coil spring is attached around the main body of the connecting member 152a so as to be located between the punch holder 151 and the stripper 152, for example.

[0080] The head of the connection member 152a is located above the through-hole 151b. The outer shape of the head of the connection member 152a is set to be larger than the outer shape of the main body of the connection member 152a when viewed from above.

[0081] Therefore, the head of the connecting member 152a functions as a stopper to prevent the main body from slipping out of the through-hole 151b when the main body moves up and down. Furthermore, the stripper 152 is suspended and held by the punch holder 151 by the head of the connecting member 152a.

[0082] The stripper 152 has a plurality of through holes formed at positions corresponding to the punches P1 to P4. Each through hole extends in the vertical direction. When viewed from above, each through hole communicates with a corresponding die hole D13 to D43. The lower portions of the punches P1 to P4 are inserted into each through hole. The lower portions of the punches P1 to P4 are slidable within each through hole.

[0083] The punches P1 to P4 are arranged in this order from the upstream side to the downstream side of the stamping device 130. The lower ends of the punches P1 to P4 have shapes corresponding to the die holes D13 to D43, respectively.

[0084] In the example of Figure 3, an example is shown in which four die members and four punches are provided in the press processing device 130, but the present disclosure is not limited to such an example, and the number of die members and punches can be changed in various ways depending on the shape of the laminated core 1 and the core pieces W.

[0085] The press 160 is located above the upper die 150. The piston of the press 160 is connected to the punch holder 151 and operates based on a command signal from the controller Ctr. When the press 160 operates, the piston expands and contracts, causing the entire upper die 150 to move up and down.

[0086] <Manufacturing process> Next, the manufacturing process of the laminated core 1 by the stamping device 130 according to the embodiment will be described with reference to Figures 5 and 6 in addition to Figures 3 and 4 described so far. Figure 5 is a flowchart showing an example of the procedure of each manufacturing process executed by the stamping device 130 according to the embodiment.

[0087] As shown in FIG. 5, the controller Ctr (see FIG. 1) first controls the feeding device 120 (see FIG. 2) and the like to feed the electromagnetic steel sheet MS (see FIG. 2) forward by a predetermined pitch within the press processing device 130 (see FIG. 2) along the direction D (step S1).

[0088] In parallel with step S1, a press working step (step S2), an adhesive application step (step S3), and an iron core piece forming step (step S4) are carried out in this order.

[0089] In the press working step (step S2), the controller Ctr controls the press working device 130 to lower the upper die 150 (see FIG. 3) so that the electromagnetic steel sheet MS is sandwiched between the upper die 150 and the lower die 140 (see FIG. 3), and press working is performed on the electromagnetic steel sheet MS. This forms the teeth portion 3 (see FIG. 1) and the like in the iron core piece W (see FIG. 1).

[0090] In the adhesive application step (step S3), the controller Ctr controls the application unit 143 (see FIG. 4) to apply adhesive B to the lower surface MS1 (see FIG. 6) of the electromagnetic steel sheet MS. Note that adhesive B is not applied to the bottom core piece W in the laminate 10 (see FIG. 3).

[0091] In the core piece forming process (step S4), the controller Ctr controls the press working device 130 to lower the upper die 150 so that the electromagnetic steel sheet MS is sandwiched between the upper die 150 and the lower die 140, and the electromagnetic steel sheet MS is punched out to form the core piece W.

[0092] Next, the controller Ctr controls the press working device 130 to stack the plurality of core pieces W to form the laminate 10 that will become the laminated core 1 (step S5).

[0093] Next, the controller Ctr determines whether a predetermined number of core pieces W have been stacked and the process of forming the laminate 10 has been completed (step S6). If the process of forming the laminate 10 has been completed (step S6, Yes), the series of processes ends. On the other hand, if the process of forming the laminate 10 has not been completed (step S6, No), the process returns to steps S1 and S2.

[0094] Next, details of the adhesive application step to which the technology of the present disclosure is applied will be described with reference to Fig. 6. Fig. 6 is a bottom view showing an example of an electromagnetic steel sheet MS to be punched by the stamping device 130 according to an embodiment.

[0095] For ease of understanding, FIG. 6 shows the electromagnetic steel sheet MS corresponding to the final portion of the punching process, and also shows the positions of the lifter 146 and the like provided on the lower die 140 (see FIG. 4).

[0096] 6 are areas that have been punched out before reaching the coating unit 143 and the die member D1. That is, as shown in Fig. 6, when the electromagnetic steel sheet MS according to the embodiment reaches the coating unit 143 where adhesive B is applied and the die member D4 where punching is performed, the portions corresponding to the through holes 1a (see Fig. 1) and the slots 4 (see Fig. 1) have been punched out.

[0097] Furthermore, pilot holes H2 are formed in both edge portions of the electromagnetic steel sheet MS by punching in the upstream die members D1 to D3 (see FIG. 3). These pilot holes H2 are formed in each die member provided in the press working device 130 (see FIG. 1) so that the electromagnetic steel sheet MS can be positioned by pilot pins (not shown) when punching the electromagnetic steel sheet MS with punches P1 to P4 (see FIG. 3).

[0098] Then, the stamping device 130 applies adhesive B to the lower surface MS1 of the electromagnetic steel sheet MS in the application unit 143. Furthermore, the stamping device 130 punches out a portion of the electromagnetic steel sheet MS that has been fed progressively from the application unit 143 to the die member D4 along the direction D, corresponding to the entire core piece W (see FIG. 1).

[0099] 6, the hatched areas are areas that are punched out by the die member D4, whereby one iron core piece W is formed in the press working device 130.

[0100] Here, in the embodiment, the adhesive B applied to the core piece region R corresponding to the core piece W is evenly arranged in the circumferential direction of the yoke portion 2. For example, in the example of Fig. 6, 12 adhesives B applied to the yoke portion 2 are evenly arranged at 30° intervals in the circumferential direction.

[0101] 6, in the embodiment, in the step of applying adhesive B, a region N is formed in a part of the core piece region R corresponding to the core piece W. This region N is a region where the core piece region R corresponding to the core piece W overlaps with the contact region S where the lifter 146a contacts the lower surface MS1 of the electromagnetic steel sheet MS.

[0102] The lifter 146a refers to a lifter among the plurality of lifters 146 that is located between a group of discharge ports provided in the coating unit 143 and the die hole D43 (see FIG. 4) of the die member D4. For example, a plurality of lifters 146a (four in the figure) are provided in the press working device 130, and the plurality of lifters 146a are arranged in two rows along the direction D.

[0103] As shown in FIG. 6, when the lifters 146 are arranged along the direction D, the lifter 146a downstream of the discharge port group provided in the application unit 143 supports the electromagnetic steel sheet MS after the adhesive B has been applied.

[0104] Under such conditions, the lifter 146a can come into contact with a contact area S indicated by a dashed line on the lower surface MS1 of the electromagnetic steel sheet MS. The contact area S extends along the forward feeding direction D and overlaps with the lifter 146a.

[0105] In this embodiment, multiple adhesives B are arranged at different radial distances from the central axis Ax (see FIG. 1) of the core pieces W and are evenly spaced in the circumferential direction throughout the yoke portion 2, thereby preventing application of adhesive B to region N. This makes it possible to prevent adhesive B from adhering to the lifter 146.

[0106] Furthermore, in the embodiment, it is possible to prevent the adhesive B from adhering to the lifter 146 while preventing the electromagnetic steel sheet MS from becoming wider, and therefore it is possible to suppress an increase in material costs.

[0107] In addition, in the embodiment, it is preferable that multiple adhesives B are evenly arranged in the circumferential direction in the yoke portion 2 of the core piece W. This makes it possible to prevent a decrease in rigidity in only one direction even in a laminated core 1 formed by stacking core pieces W having the above-described region N. Furthermore, in the embodiment, it is possible to prevent the occurrence of uneven thickness depending on the presence or absence of adhesive B.

[0108] In the example of Figure 6, 12 adhesives B are applied to the yoke portion 2 and are evenly spaced at 30° intervals in the circumferential direction, but the present disclosure is not limited to this example, and the number of adhesives B applied to the yoke portion 2 can be set as appropriate.

[0109] In addition, in the embodiment, the multiple adhesives B arranged side by side in the circumferential direction of the yoke portion 2 may be arranged in a staggered pattern. This allows the multiple adhesives B to be arranged in a balanced manner over the entire yoke portion 2, further preventing a decrease in rigidity in only one direction.

[0110] In the embodiment, adhesive B may also be applied to the teeth 3 of the core piece W. For example, in the example of Fig. 6, one adhesive B is applied to each of all teeth 3 that are aligned in the circumferential direction. Furthermore, the multiple adhesives B positioned across the entire tooth 3 have the same radial distance from the central axis Ax of the core piece W and are evenly arranged in the circumferential direction.

[0111] Furthermore, in the embodiment, the plurality of iron core pieces W may be stacked while being rotated, or the plurality of iron core pieces W may be stacked without being rotated. For example, when the plurality of iron core pieces W are stacked while being rotated, in the embodiment, the adhesives B adjacent to each other along the stacking direction may be arranged at different positions (i.e., not overlapping) in a plan view.

[0112] This allows the adhesives B to be more evenly distributed in the circumferential direction of the yoke portion 2 of the core piece W, further preventing the rigidity of the laminated core 1 from decreasing in only one direction.

[0113] When multiple iron core pieces W are stacked while being rotated, they may be stacked while shifting the angle for each piece, or they may be stacked while shifting the angle for every several pieces. As a result, adhesives B adjacent in the stacking direction may be arranged to overlap each other in a plan view.

[0114] Even when adjacent adhesives B are arranged so as to overlap each other in a planar view along the stacking direction, multiple adhesives B are arranged evenly in the circumferential direction in the yoke portion 2 of the core piece W, thereby preventing a decrease in rigidity in only one direction in the laminated core 1.

[0115] <Various modified examples> Next, various modified examples of the above-described embodiment will be described with reference to Figures 7 to 9. Figure 7 is a bottom view showing an example of an electromagnetic steel sheet MS that is subjected to stamping processing by a stamping device 130 according to a first modified example of the embodiment.

[0116] As shown in FIG. 7, in Modification 1, a plurality of adhesives B arranged on the yoke portion 2 are arranged at the same radial distance from the central axis Ax (see FIG. 1) of the core piece W and are arranged evenly in the circumferential direction.

[0117] On the other hand, in Modification 1, the multiple adhesives B located over the entire tooth portion 3 are arranged at different radial distances from the central axis Ax of the core piece W and are evenly arranged in the circumferential direction. For example, in the example of Fig. 7, the multiple adhesives B arranged side by side in the circumferential direction are arranged in a staggered pattern over the entire tooth portion 3.

[0118] This prevents the adhesive B from being applied to the region N formed in the tooth portion 3 and the yoke portion 2 so as to extend along the direction D. Therefore, according to the first modification, even if the lifter 146 is disposed on the inner side compared to the above-described embodiment, adhesion of the adhesive B to the lifter 146 can be suppressed.

[0119] 8 is a bottom view showing an example of an electromagnetic steel sheet MS that is punched by a stamping device 130 according to Modification 2 of the embodiment. As shown in Fig. 8, in Modification 2, a plurality of adhesives B that are positioned over the entire yoke portion 2 and the entire tooth portion 3 are arranged at different radial distances from the central axis Ax of the core piece W and are evenly arranged in the circumferential direction.

[0120] For example, in Modification 2, a plurality of adhesives B are positioned over the entire yoke portion 2 and the entire teeth portion 3, and are arranged in a staggered pattern in the circumferential direction.

[0121] This makes it possible to prevent adhesive B from being applied to regions N formed in the yoke portion 2 and the teeth portion 3 so as to extend along direction D. Therefore, according to Modification 2, even when the lifters 146 are arranged on the outer and inner sides of the electromagnetic steel sheets MS, adhesion of adhesive B to the lifters 146 can be suppressed.

[0122] FIG. 9 is a bottom view showing an example of an electromagnetic steel sheet MS to be punched by a stamping device 130 according to a third modification of the embodiment.

[0123] 9, in Modification 3, the arrangement of the multiple adhesives B in the yoke portion 2 differs from the above-described embodiment. Specifically, in Modification 3, of the multiple adhesives B located in the yoke portion 2, the adhesives B that may be close to the abutment region S are arranged in a staggered pattern, while the other adhesives B are arranged so that they are all the same radial distance from the central axis Ax of the core piece W (see FIG. 1).

[0124] This also makes it possible to prevent adhesive B from being applied to region N formed on yoke portion 2 so as to extend along direction D by arranging adhesive B, which may be close to contact region S, in a staggered pattern. Therefore, according to modification 3, adhesion of adhesive B to lifter 146 can be suppressed.

[0125] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention. For example, in the above-described embodiments, an example is shown in which multiple lifters 146a are arranged to pass through region N of the core piece W, but the present disclosure is not limited to such an example, and one lifter 146a may be arranged to pass through region N of the core piece W.

[0126] In addition, in the above embodiment, the press processing device 130 punches out the electromagnetic steel sheet MS, but the present disclosure is not limited to such an example. For example, the electromagnetic steel sheet MS may be half-punched, or a metal plate different from the electromagnetic steel sheet MS may be punched or half-punched.

[0127] As described above, the laminated core 1 according to the embodiment includes a plurality of stacked core pieces W and adhesive B that bonds adjacent core pieces W together. The core pieces W have an annular yoke portion 2 and a plurality of teeth 3 that protrude radially from the yoke portion 2. The adhesive B is disposed at different radial distances from the central axis Ax of the core pieces W and evenly in the circumferential direction over at least one of the entire yoke portion 2 or the entire teeth 3. This makes it possible to prevent the adhesive B from adhering to the lifter 146.

[0128] Furthermore, in the laminated core 1 according to the embodiment, the core pieces W have a region N arranged along a predetermined direction D, and the adhesive B is not applied to the region N. This makes it possible to prevent the adhesive B from adhering to the lifter 146.

[0129] Furthermore, in the laminated core 1 according to the embodiment, the adhesive B is arranged in a staggered pattern in the circumferential direction, which further prevents the rigidity from decreasing in only one direction.

[0130] Furthermore, in the laminated core 1 according to the embodiment, adhesives B adjacent to each other in the lamination direction are arranged to overlap each other in a plan view, which makes it possible to prevent the rigidity of the laminated core 1 from decreasing in only one direction.

[0131] Furthermore, in the laminated core 1 according to the embodiment, adhesives B adjacent to each other in the lamination direction are arranged at different positions in a plan view, which further prevents the rigidity of the laminated core 1 from decreasing in only one direction.

[0132] Furthermore, the manufacturing method of the laminated core 1 according to the embodiment includes a forwarding step (step S1), an applying step (step S3), a forming step (step S4), and a stacking step (step S5). In the forwarding step (step S1), the metal plate (electromagnetic steel plate MS) is forwarded in a predetermined direction D while the lower surface MS1 of the metal plate (electromagnetic steel plate MS) is supported by a plurality of lifters 146. In the applying step (step S3), adhesive B is applied to a core piece region R of the lower surface MS1 of the metal plate (electromagnetic steel plate MS) that will become the core piece W having an annular yoke portion 2 and a plurality of teeth 3 protruding radially from the yoke portion 2. In the forming step (step S4), the core piece region R to which adhesive B has been applied is punched to form the core piece W. In the stacking step (step S5), adjacent core pieces W are bonded together with adhesive B, and a plurality of core pieces W are stacked. Furthermore, in the application process (step S3), adhesive B is distributed evenly circumferentially at different radial distances from the central axis Ax of the core piece W on at least one of the entire yoke portion 2 or the entire tooth portion 3, and regions N are arranged on the core piece W along a predetermined direction D. Furthermore, in the forward feeding process (step S1), the lower surface MS1 of the metal plate (electromagnetic steel sheet MS) is supported by multiple lifters 146 so that at least one lifter 146a passes through region N. This makes it possible to prevent adhesive B from adhering to the lifters 146.

[0133] Furthermore, in the manufacturing method of the laminated core 1 according to the embodiment, in the applying step (step S3), the adhesive B is arranged in a staggered pattern in the circumferential direction, which further prevents the rigidity from decreasing in only one direction.

[0134] Furthermore, in the manufacturing method of the laminated core 1 according to the embodiment, in the laminating step (step S5), adhesives B adjacent in the laminating direction are arranged to overlap each other in a plan view, which makes it possible to prevent the rigidity of the laminated core 1 from decreasing in only one direction.

[0135] Furthermore, in the manufacturing method of the laminated core 1 according to the embodiment, in the laminating step (step S5), adhesives B adjacent to each other in the laminating direction are arranged at different positions in a plan view, which further prevents the rigidity of the laminated core 1 from decreasing in only one direction.

[0136] Moreover, the progressive die device (pressing device 130) according to the embodiment includes an upper die 150, a lower die 140, multiple lifters 146, and an application unit 143. The upper die 150 and the lower die 140 press a strip-shaped metal plate (electromagnetic steel sheet MS) that is fed progressively in a predetermined direction D to form an iron core piece W having an annular yoke portion 2 and multiple teeth portions 3 that protrude radially from the yoke portion 2. The multiple lifters 146 are provided on the lower die 140 and support a lower surface MS1 of the metal plate (electromagnetic steel sheet MS) when the metal plate (electromagnetic steel sheet MS) is fed progressively. The application unit 143 is provided on the lower die 140 and applies adhesive B to the lower surface MS1 of the metal plate (electromagnetic steel sheet MS). Furthermore, the application unit 143 applies adhesive B to the lower surface MS1 of the metal plate (electromagnetic steel sheet MS) so that the adhesive B is distributed evenly in the circumferential direction at different radial distances from the central axis Ax of the core piece W over at least one of the entire yoke portion 2 or the entire tooth portion 3, and that an area N of the core piece W where adhesive B is not applied is arranged along a predetermined direction D. Furthermore, at least one lifter 146a supports the lower surface MS1 of the metal plate (electromagnetic steel sheet MS) so as to pass through the area N. This makes it possible to prevent adhesive B from adhering to the lifter 146.

[0137] Further advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. [Explanation of symbols]

[0138] 1 Laminated core 2 Yoke 3 Teeth 100 Manufacturing equipment 130 Press processing equipment (an example of a progressive die device) 140 Lower mold 146, 146a Lifter 150 upper mold Ax center axis B. Adhesive D direction MS: Electromagnetic steel sheet (an example of a metal sheet) N area R Core piece area S contact area W core piece

Claims

1. a plurality of stacked core pieces; an adhesive that bonds adjacent core pieces together; Equipped with The core pieces each have an annular yoke portion and a plurality of teeth protruding from the yoke portion in a radial direction, The adhesive is disposed in a staggered pattern throughout the yoke portion at different radial distances from the central axis of the core piece, and is uniformly disposed in the circumferential direction, and the yoke portion has regions in which the adhesive is not applied, disposed along a predetermined direction between adjacent staggered adhesives in the circumferential direction. Laminated iron core.

2. The adhesives adjacent to each other in the stacking direction are arranged to overlap each other in a plan view. The laminated core according to claim 1 .

3. The adhesives adjacent to each other in the stacking direction are disposed at different positions in a plan view. The laminated core according to claim 1 .

4. a step of feeding the metal plate in a predetermined direction while supporting the lower surface of the metal plate with a plurality of lifters; applying an adhesive to a core piece region of the lower surface of the metal plate, the core piece region having an annular yoke portion and a plurality of teeth protruding from the yoke portion in a radial direction; stamping the core piece region to form the core piece; a step of stacking the plurality of iron core pieces while adhering the iron core pieces to each other with the adhesive; Including, In the applying step, the adhesive is applied to at least one of the entire yoke portion or the entire tooth portion at different radial distances from the central axis of the core pieces, and is uniformly and staggered in the circumferential direction, and regions of the core pieces where the adhesive is not applied are arranged along the predetermined direction, The step of feeding the metal plate forward includes supporting the lower surface of the metal plate with a plurality of lifters so that at least one of the lifters passes through the region. Manufacturing method of laminated core.

5. In the laminating step, the adhesives adjacent to each other in the laminating direction are arranged so as to overlap each other in a plan view. The method for manufacturing a laminated core according to claim 4 .

6. A step of feeding the metal plate in a predetermined direction while supporting the lower surface of the metal plate with a plurality of lifters; applying an adhesive to a core piece region of the lower surface of the metal plate, the core piece region having an annular yoke portion and a plurality of teeth protruding from the yoke portion in a radial direction; stamping the core piece region to form the core piece; a step of stacking the plurality of iron core pieces while adhering the iron core pieces to each other with the adhesive; Including, In the applying step, the adhesive is applied to at least one of the entire yoke portion or the entire tooth portion at different radial distances from the central axis of the core pieces and evenly distributed in the circumferential direction, and regions of the core pieces where the adhesive is not applied are arranged along the predetermined direction, The step of feeding the metal plate forward includes supporting a lower surface of the metal plate with a plurality of lifters so that at least one of the lifters passes through the region; In the laminating step, the adhesives adjacent to each other in the laminating direction are disposed at different positions from each other in a plan view. Manufacturing method of laminated core.

7. an upper mold and a lower mold for pressing a strip-shaped metal plate fed in a predetermined direction to form an iron core piece having an annular yoke portion and a plurality of teeth protruding from the yoke portion in a radial direction; a plurality of lifters provided in the lower die and supporting a lower surface of the metal plate when the metal plate is fed forward; an application unit provided in the lower mold and configured to apply adhesive to a lower surface of the metal plate; Equipped with the application unit applies the adhesive to the underside of the metal plate so that the adhesive is disposed at different radial distances from the central axis of the core pieces and is evenly and staggered in the circumferential direction in at least one of the entire yoke portion or the entire tooth portion, and so that areas of the core pieces to which the adhesive is not applied are disposed along the predetermined direction; At least one of the lifters supports the lower surface of the metal plate so that the metal plate passes through the area. Progressive die device.

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