DEVICE AND METHOD FOR MANUFACTURING A LAMINATED CORE

Abstract

Provided are a layered iron core manufacturing device and manufacturing method that facilitate the assembly of an adhesive application means and can shorten the time required for maintenance. This manufacturing device 1 for a layered iron core 4 comprises: an adhesive application means 6 for applying an adhesive to a site on a steel sheet 2 corresponding to an iron core thin sheet 3; and a forward / reverse drive unit 7 for switching whether or not the adhesive is to be applied by the adhesive application means 6. The adhesive application means 6 has a discharge unit 60 that is configured so as to discharge the adhesive from the tip of a passage 60a. The adhesive application means 6 or the discharge unit 60 comprises a member made of a solid or non-porous organic resin. The passage 60a is formed by a wall surface of the solid or non-porous organic resin. The adhesive application means 6 is disposed so that, when the adhesive is to be applied, the adhesive discharged from the tip of the discharge unit 60 in accordance with vertical movement of the steel sheet 2 that accompanies punching of the iron core thin sheet 3 from the steel sheet 2 is brought into contact with the steel sheet 2.

Description

Manufacturing device and manufacturing method for laminated iron core

[0001] The present invention relates to a laminated core manufacturing apparatus and method for manufacturing a laminated core by punching out thin core plates of a predetermined shape from a steel plate and stacking and bonding a predetermined number of thin core plates.

[0002] The cores used in rotating electrical machines are laminated cores, which are made up of a predetermined number of laminated thin core plates. The thin core plates are joined together by various methods. When crimping and welding are used as joining methods, mechanical or thermal stresses during joining and interlayer short circuits can deteriorate the magnetic properties of the laminated core, preventing the laminated core from fully performing its functions. For this reason, efforts have been made to laminate and bond the thin core plates, as shown in Patent Document 1 below.

[0003] Patent Document 1 describes a laminated core manufacturing device that includes a progressive die means having upper and lower dies that sequentially punches out iron core sheets from an intermittently transported thin steel strip, and an adhesive applicator provided within the lower die that applies adhesive to portions of the thin steel strip that correspond to the iron core sheets. The adhesive applicator includes an adhesive discharge unit including a nozzle block with multiple discharge holes on its upper surface, and an adhesive supply unit that supplies adhesive to the adhesive discharge unit at a predetermined pressure to discharge adhesive from the multiple discharge holes. The adhesive applicator also includes an advancing / retracting drive unit that moves the adhesive discharge unit toward and away from the adhesive application surface of the thin steel strip. The advancing / retracting drive unit moves the adhesive discharge unit toward and away from the adhesive application surface of the thin steel strip, thereby switching between performing and not performing the adhesive application process by the adhesive discharge unit. A laminated core consisting of a predetermined number of iron core sheets is separated from the group of iron core sheets at the position of the iron core sheets that do not have adhesive applied.

[0004] Japanese Patent Application Laid-Open No. 2017-216873

[0005] In the conventional device described in the above Patent Document 1, the execution or non-execution of the adhesive application process is switched by moving the adhesive discharge unit forward and backward. Therefore, it is necessary to strictly control the dimensional accuracy of the position of the adhesive discharge unit relative to the strip-shaped thin steel sheet and the position between the components of the metal formed product, and metal formed products that can have high shape accuracy are generally used as the components of the metal formed product.

[0006] On the other hand, when performing maintenance on the manufacturing equipment, it is necessary to disassemble the adhesive discharge unit and reassemble it into the mold of the manufacturing equipment. As described above, with conventional equipment, dimensional accuracy must be strictly controlled, and the time required for maintenance increases because the adhesive discharge unit must be assembled precisely.

[0007] The present invention has been made to solve the above-mentioned problems, and one of its objects is to provide a manufacturing apparatus and manufacturing method for a laminated core that makes it easier to assemble an adhesive application means and reduces the time required for maintenance.

[0008] In one embodiment, the laminated core manufacturing apparatus of the present invention is a laminated core manufacturing apparatus for punching out thin iron core plates of a predetermined shape from a steel plate and manufacturing a laminated iron core in which a predetermined number of thin iron core plates are stacked and bonded together, and is equipped with an adhesive application means for applying adhesive to portions of the steel plate corresponding to the thin iron core plates, and an advance / retract drive unit for moving the adhesive application means back and forth relative to the steel plate to switch whether or not to apply adhesive using the adhesive application means, the adhesive application means having a passage through which the adhesive passes and a discharge unit configured to discharge adhesive from the tip of the passage, the adhesive application means or the discharge unit being made of a solid or non-porous organic resin member, the passage being formed by the wall surface of the solid or non-porous organic resin, and the adhesive application means being arranged so that when the adhesive is applied, the adhesive discharged from the tip of the discharge unit comes into contact with the steel plate in accordance with the up and down movement of the steel plate associated with punching out the thin iron core plates from the steel plate.

[0009] In one embodiment, a method for manufacturing a laminated core according to the present invention includes manufacturing a laminated core using the above-described laminated core manufacturing apparatus.

[0010] According to one embodiment of the laminated iron core manufacturing apparatus and manufacturing method of the present invention, the adhesive application means or discharge section is made of a solid or non-porous organic resin member, a passage is formed by the wall surface of the solid or non-porous organic resin, and the adhesive application means is positioned so that when adhesive is applied, the adhesive discharged from the tip of the discharge section comes into contact with the steel plate in accordance with the up and down movement of the steel plate associated with punching out the iron core thin plate from the steel plate.Therefore, even if a misalignment occurs in the vertical position of the adhesive application means relative to the steel plate, the misalignment can be absorbed by the adhesive application means itself or the discharge section, making it easier to assemble the adhesive application means and shortening the time required for maintenance.

[0011] FIG. 1 is an explanatory diagram showing a laminated core manufacturing apparatus according to embodiment 1 of the present invention. FIG. 2 is an explanatory diagram showing an enlarged view of the adhesive application means of FIG. 1 and its periphery. FIG. 3 is an explanatory diagram showing a main part of a laminated core manufacturing apparatus according to embodiment 2 of the present invention. FIG. 4 is an explanatory diagram showing a main part of a laminated core manufacturing apparatus according to embodiment 3 of the present invention. FIG. 5 is an explanatory diagram showing a main part of a laminated core manufacturing apparatus according to embodiment 5 of the present invention.

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to each embodiment, and the components can be modified and embodied without departing from the spirit of the present invention. Furthermore, various inventions can be formed by appropriately combining multiple components disclosed in each embodiment. For example, some components may be omitted from all the components shown in the embodiments. Furthermore, components of different embodiments may be appropriately combined.

[0013] Embodiment 1. Figure 1 is an explanatory diagram showing a manufacturing apparatus 1 for manufacturing a laminated core 4 according to embodiment 1 of the present invention, and Figure 2 is an explanatory diagram showing an enlarged view of adhesive application means 6 and its surroundings in Figure 1. The manufacturing apparatus 1 shown in Figure 1 is an apparatus for punching out thin core sheets 3 of a predetermined shape from a steel plate 2, and manufacturing a laminated core 4 in which a predetermined number of thin core sheets 3 are stacked and bonded together.

[0014] As shown in FIG. 1 , the manufacturing apparatus 1 of this embodiment may include a reel 10, a feed device 11, an oiling device 12, and a press facility 13. A coil of steel sheet 2 is attached to the reel 10. The steel sheet 2 unwound from the reel 10 is fed to the press facility 13 via the feed device 11. The oiling device 12 is disposed between the feed device 11 and the press facility 13, and supplies press oil to the surface of the steel sheet 2 before it is introduced into the press facility 13. The press facility 13 includes an upper die 130 and a lower die 131, which punch out the iron core sheet 3 from the steel sheet 2. The upper die 130 is attached to a mounting base 132, and the lower die 131 is attached to a bolster 133.

[0015] The manufacturing apparatus 1 may include a punching unit 50 , a stacking unit 51 and a conveying device 52 .

[0016] The punching section 50 is a section for punching out the core thin plates 3 from the steel plate 2. The punching section 50 may be composed of an upper die 130 and a lower die 131. The punching of the steel plate 2 by the punching section 50 may be performed in multiple steps. That is, the steel plate 2 may be punched out sequentially in the feed direction D1 of the steel plate 2 toward the final core thin plates 3. The punching of the steel plate 2 by the punching section 50 may include pre-processing, in which a portion other than the outer shape or periphery of the core thin plates 3 is punched out of the steel plate 2 in one or multiple steps, and outline punching, in which the outer shape of the core thin plates 3 is punched out of the steel plate 2 after the pre-processing. Outer shape punching is performed last, and the core thin plates 3 are punched out of the steel plate 2 when the outer shape of the core thin plates 3 has been punched out.

[0017] The steel sheet 2 is fed while being placed between the upper die 130 and the lower die 131. When the punching unit 50 punches out the steel sheet 2, the steel sheet 2 is lowered and placed on the upper surface of the lower die 131, and the upper die 130 is pressed down so as to penetrate the steel sheet 2. Thereafter, the steel sheet 2 is returned to the position between the upper die 130 and the lower die 131, and the steel sheet 2 is fed downstream, where the steel sheet 2 is punched out at the next position. That is, in the manufacturing apparatus 1 of this embodiment, the steel sheet 2 is moved up and down as the iron core thin sheets 3 are punched out from the steel sheet 2.

[0018] The lamination section 51 is a section for stacking and adhering the iron core thin plates 3 to which adhesive has been applied to form the iron core thin plate group 30. The lamination section 51 may be built into the lower mold 131 at a position where the punching section 50 performs outline punching. The iron core thin plate group 30 is formed by stacking and adhering multiple iron core thin plates 3. An iron core thin plate 3 is dropped onto the iron core thin plate group 30 formed by previously punched iron core thin plates 3, and is adhered in close contact with the upper surface of the iron core thin plate group 30 by the weight of the iron core thin plate 3 itself or the weight of the subsequent iron core thin plate 3, and the pressure of the upper mold 130. The upper mold 130 may be provided with a protrusion that presses the iron core thin plate 3 above the iron core thin plate group 30 downward by the thickness of one iron core thin plate 3.

[0019] As will be described later, no adhesive is applied to one of the multiple core thin plates 3. The core thin plate group 30 is separable at the core thin plates 3 that are not coated with adhesive. When the core thin plates 3 that are not coated with adhesive are called first core thin plates and the core thin plates 3 that are coated with adhesive are called second core thin plates, the laminated core 4 includes one first core thin plate and multiple second core thin plates that are stacked and bonded above or below the first core thin plate.

[0020] The conveying device 52 is a device for conveying the laminated core 4 separated from the core thin plate group 30. The laminated core 4 may be removed from the lower die 131 and the bolster 133 by the conveying device 52.

[0021] The manufacturing apparatus 1 of this embodiment has an adhesive application means 6 and an advance / retract drive unit 7 .

[0022] The adhesive application means 6 is a part for applying adhesive to the portions of the steel sheet 2 corresponding to the iron core thin plates 3. The adhesive application means 6 may be built into the upper die 130 or the lower die 131, and may apply adhesive to the surface of the steel sheet 2. In the illustrated embodiment, the adhesive application means 6 is built into the lower die 131, and applies adhesive to the underside of the steel sheet 2. The application of adhesive may be performed before the iron core thin plates 3 are finally punched out from the steel sheet 2, that is, when pre-processing is performed or before outline punching.

[0023] The advance / retract drive unit 7 is a part that switches whether or not adhesive is applied by the adhesive application unit 6 by advancing and retracting the adhesive application unit 6 relative to the steel plate 2. The advance / retract drive unit 7 can advance and retract the adhesive application unit 6 depending on the number of iron core thin plates 3 to be included in the laminated iron core 4 so as not to apply adhesive to one of the plurality of iron core thin plates 3.

[0024] The forward / backward driving unit 7 can move the adhesive application means 6 up and down. When the adhesive application means 6 is disposed below the steel plate 2 as in the illustrated embodiment, adhesive application can be performed when the adhesive application means 6 is raised, and adhesive application is not performed when the adhesive application means 6 is lowered.

[0025] 2, the adhesive application means 6 of this embodiment is provided with a passage 60a through which the adhesive passes, and has a discharge section 60 configured to discharge the adhesive from the tip of the passage 60a. In the illustrated embodiment, the discharge section 60 is configured by a plurality of nozzles arranged apart from each other.

[0026] An adhesive reservoir 62 for storing adhesive may be provided inside the adhesive application means 6, and the adhesive reservoir 62 may be connected to a passage 60a of the discharge portion 60, and the adhesive stored in the adhesive reservoir 62 may be supplied to the tip of the passage 60a. The adhesive reservoir 62 is a cavity provided inside the adhesive application means 6, and the adhesive may be supplied to the adhesive reservoir 62 through a tube 63 connected to the adhesive application means 6. The provision of the adhesive reservoir 62 makes it possible to send equal amounts of adhesive to the multiple nozzles that make up the discharge portion 60 without bias.

[0027] The shape of the adhesive puddle 62 when the adhesive application means 6 is viewed in a plan view is preferably symmetrical to or similar to the arrangement of the multiple nozzles. When the multiple nozzles are arranged in a circular shape when the adhesive application means 6 is viewed in a plan view, the shape of the adhesive puddle 62 when the adhesive application means 6 is viewed in a plan view is also preferably circular. The diameter of the circle as the outer shape of the adhesive puddle 62 when viewed in a plan view may be larger than the diameter of the circle where the multiple nozzles are arranged. The diameter of the circle where the multiple nozzles are arranged may be the diameter of a circle connecting the centers of the openings of each nozzle.

[0028] The adhesive pool 62 may have a bottom wall 62a formed of a surface that slopes downward toward the center of the adhesive pool 62 in the width or radial direction, a cylindrical peripheral wall 62b extending upward from the upper edge of the bottom wall 62a, and a disk-shaped upper wall 62c connecting the upper edge of the peripheral wall 62b. An external tube 63 may be connected to the bottom of the bottom wall 62a, and multiple connecting passages 62d extending upward from the upper wall 62c may be connected to the passages 60a of each nozzle. The bottom wall 62a, peripheral wall 62b, upper wall 62c, connecting passages 62d, and tube 63 are preferably connected smoothly. The connecting portions thereof are preferably provided with chamfered surfaces.

[0029] The adhesive application means 6 or the discharge part 60 is made of a solid or non-porous organic resin material. The entire adhesive application means 6 may be made of a solid or non-porous organic resin material. It is preferable that at least the discharge part 60 is made of a solid or non-porous organic resin material. The passage 60a of the discharge part 60 is formed by a wall surface of a solid or non-porous organic resin. "Solid" or "non-porous" means that it is not porous like a sponge, but has a predetermined density. The density of the organic resin material that constitutes the adhesive application means 6 or the discharge part 60 is, for example, 0.9 g / m 3 2.6g / m or more 3The density of the member is measured using a pycnometer as described in JIS K7112-1999. In this embodiment, it is intended that the adhesive pass through the passages 60a, and not that the adhesive penetrate through the wall surfaces of the organic resin. The maximum diameter or width of the passages 60a is, for example, 1 mm or more and 5 mm or less. The maximum diameter or width of the passages 60a is measured visually using a vernier caliper or the like. The Vickers hardness of the member is, for example, 5 or more and 100 or less. The Vickers hardness is measured in accordance with JIS B7725-2010 under a load of 100 g.

[0030] Any organic resin may be used for the components constituting the adhesive application means 6 or the discharge portion 60, such as polyacetal (POM), polyamide (PA), polycarbonate (PC), modified polyphenylene ether (m-PPE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), polysulfone (PSU), polyethersulfone (PES), polyarylate (PAR), polyamideimide (PAI), polyetheretherketone (PEEK), polytetrafluoroethylene (PTEF), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), or polystyrene (PS). In particular, the use of polyacetal (POM), polyamide (PA), or polyethylene terephthalate (PET) can provide good sliding properties and / or wear resistance.

[0031] In the manufacturing apparatus 1 of this embodiment, the adhesive application means 6 is arranged so that when adhesive is applied, the adhesive discharged from the tip of the discharge section 60 comes into contact with the steel plate 2 in response to the up and down movement of the steel plate 2 associated with punching out the iron core thin plate 3 from the steel plate 2.

[0032] If the adhesive applicator 6 is made of a hard material such as a metal molded product, it is preferable to assemble the adhesive applicator 6 to the mold of the manufacturing apparatus 1 so that the steel plate 2 comes into contact with only the adhesive dispensed from the tip of the discharge part 60 with high precision. This is because if the steel plate 2 is repeatedly pressed strongly against the tip of the discharge part 60, excessive adhesive may adhere to the steel plate 2 or the discharge part 60 may be damaged. When performing maintenance on the manufacturing apparatus 1, the adhesive applicator 6 must be disassembled and reassembled to the mold of the manufacturing apparatus 1. Furthermore, if the tip of the discharge part 60 is positioned lower than the steel plate 2 and does not make contact slightly, the amount of adhesive that adheres to the steel plate 2 may vary depending on the properties of the adhesive, which may result in adhesion or failure. If the adhesive applicator 6 is made of a hard material, the adhesive applicator 6 must be assembled precisely, which increases the time required for maintenance. However, in the manufacturing apparatus 1 of this embodiment, the adhesive application means 6 or the discharge unit 60 is made of an organic resin member, so even if a misalignment occurs in the vertical position of the adhesive application means 6 relative to the steel plate 2, the misalignment can be absorbed by the adhesive application means 6 itself or the discharge unit 60. This makes it easier to assemble the adhesive application means 6 and reduces the time required for maintenance. The adhesive application means 6 of this embodiment may be positioned so that the tip of the discharge unit 60 comes into contact with the steel plate 2 in accordance with the vertical movement of the steel plate 2 associated with punching out the iron core thin plate 3 from the steel plate 2.

[0033] Furthermore, if the adhesive application means 6 is made of a metal molded product, the metal acts as a catalyst, making it easier for the adhesive to harden. By making the adhesive application means 6 or the discharge part 60 out of an organic resin member, unnecessary hardening of the adhesive can be avoided.

[0034] The adhesive application means 6 may be disposable. In other words, when the usage time or number of times of the adhesive application means 6 exceeds a preset time or number of times, the adhesive application means 6 may be replaced with a new adhesive application means 6 without cleaning and reusing the adhesive application means 6.

[0035] 2, the adhesive applying means 6 further includes a holding portion 61 that holds the discharge portion 60, and the discharge portion 60 may be provided so as to protrude from an end surface 61a of the holding portion 61. Alternatively, the discharge portion 60 may be provided so that its tip is flush with the end surface 61a of the holding portion 61.

[0036] The holding portion 61 may have a large diameter portion 610 and a small diameter portion 611 protruding from an end surface 610a of the large diameter portion 610. The outer diameter of the small diameter portion 611 is smaller than the outer diameter of the large diameter portion 610. The large diameter portion 610 and the small diameter portion 611 may be provided coaxially with each other. A plurality of nozzles (discharge portions 60) may be provided protruding from the end surface 611a of the small diameter portion 611. A step portion 612 is formed by the end surface 610a of the large diameter portion 610 and the circumferential surface 611b of the small diameter portion 611. The step portion 612 may be provided over the entire circumferential area of ​​the large diameter portion 610 and the small diameter portion 611.

[0037] 1 , the adhesive application means 6 is housed in a through-hole 131c that passes through between the inner surface 131a and the outer surface 131b of the lower mold 131. The inner surface 131a and the outer surface 131b may be surfaces of the lower mold 131 that are separated in the vertical direction. The inner surface 131a is the surface that faces the steel plate 2, and the outer surface 131b may be the surface that is placed on the bolster 133.

[0038] 2, at least one positioning protrusion 131d protruding radially inward of the through hole 131c is provided at the end of the through hole 131c on the inner surface 131a side, and the position (i.e., height position) of the adhesive application means 6 on the inner surface 131a side can be determined by the positioning protrusion 131d. The positioning protrusion 131d abuts against the step portion 612 of the holding portion 61, restricting movement of the adhesive application means 6 toward the inner surface 131a (upward), thereby performing positioning by the positioning protrusion 131d. One or more positioning protrusions 131d may be provided over the entire circumferential area of ​​the through hole 131c or over a portion thereof. The multiple positioning protrusions 131d may be provided spaced apart from each other in the circumferential direction of the through hole 131c. At the upper limit position of the adhesive application means 6 where the positioning protrusion 131d is in contact with the adhesive application means 6 or its step portion 612, it is preferable that the tip of the discharge portion 60 is positioned at the same height as the inner surface 131a of the lower mold 131.

[0039] As shown in FIG. 1 , in this embodiment, the advance / retract drive unit 7 is configured by a hydraulic cylinder having a fixed body 70 and a rod 71 that is provided so as to be able to advance and retract relative to the fixed body 70. The fixed body 70 includes a cylinder body 700. The fixed body 70 or the cylinder body 700 may be at least partially disposed outside the through-hole 131c. In the illustrated embodiment, the cylinder body 700 is disposed outside the outer surface 131b of the lower mold 131, and the rod 71 is inserted into the through-hole 131c and connected to the adhesive application means 6. The rod 71 is indirectly connected to the adhesive application means 6 via a buffer member 8. However, the cylinder body 700 may also be disposed inside the lower mold 131.

[0040] The manufacturing apparatus 1 may further include a buffer member 8 to accommodate displacement of the adhesive application means 6 in the direction D2 of advance / retraction of the adhesive application means 6 by the advance / retract drive unit 7. The buffer member 8 can accommodate vertical displacement of the adhesive application means 6. Examples of the buffer member 8 include a spring, an air cylinder, and a rubber buffer material. Even if a vertical positional shift occurs in the adhesive application means 6 relative to the steel plate 2, the buffer member 8 can further absorb the shift. This further simplifies assembly of the adhesive application means 6 and reduces the time required for maintenance. When the adhesive application means 6 is at its uppermost position, with the positioning protrusion 131d abutting the step portion 612, a shrinkage margin remains in the buffer member 8, allowing the adhesive application means 6 to move downward when subjected to an input from above.

[0041] The buffer member 8 is disposed between the adhesive application means 6 and the advance / retract drive unit 7. More specifically, the buffer member 8 is disposed between the rod 71 and the adhesive application means 6. The buffer member 8 is fixed to the upper end of the rod 71. A mounting table 80 is fixed to the upper part of the buffer member 8. The adhesive application means 6 is mounted on the mounting table 80. A pressure sensor 81 is attached to the mounting table 80, and the adhesive application means 6 is mounted on the pressure sensor 81. The advance / retract drive unit 7 can control the advance / retract of the adhesive application means 6 based on the pressure detected by the pressure sensor 81. In this embodiment, the detected pressure corresponds to the pressing pressure of the step portion 612 against the positioning protrusion 131d. The advance / retract drive unit 7 can raise the rod 71 until the detected pressure reaches a predetermined value.

[0042] As described above, in this embodiment, a plurality of nozzles serving as the ejection unit 60 are held by the holding unit 61. If a plurality of nozzles were provided individually, each nozzle would require its own buffer member 8. By holding a plurality of nozzles in the holding unit 61 as in this embodiment, it is possible to consolidate the buffer member 8 into one, thereby simplifying the structure.

[0043] Embodiment 2. Figure 3 is an explanatory diagram showing the main parts of a manufacturing apparatus 1 for a laminated core 4 according to embodiment 2 of the present invention. In embodiment 1, the mounting table 80 is described as being interposed between the adhesive application means 6 and the buffer members 8. However, as shown in Figure 3, the adhesive application means 6 may be disposed directly on the buffer members 8.

[0044] As particularly shown in FIG. 3 , when the cylinder body 700 is disposed outside the outer surface 131b of the lower mold 131, the cylinder body 700 may be fixed to the outer surface 131b of the lower mold 131. The cylinder body 700 has a disk-shaped flange portion 70a. The outer diameter of the flange portion 70a is larger than the inner diameter of the through-hole 131c. The flange portion 70a may be fixed to the outer surface 131b of the lower mold 131 around the through-hole 131c, thereby fixing the cylinder body 700 to the outer surface 131b of the lower mold 131. The flange portion 70a may be fixed to the outer surface 131b of the lower mold 131 with a fastening member such as a bolt. At least one protrusion 70b protrudes from the end face of the flange portion 70a. The protrusion 70b fits along the inner circumferential surface of the through-hole 131c, thereby determining the position of the forward / backward driving unit 7. The rod 71 is connected to the adhesive application means 6 via a buffer member 8. Other configurations are the same as those in the first embodiment.

[0045] Embodiment 3. Figure 4 is an explanatory diagram showing the main components of a manufacturing apparatus 1 for a laminated core 4 according to embodiment 3 of the present invention. As shown in Figure 4, a mounting table 80 may be fixed to the upper end of a rod 71, and an adhesive application means 6 may be placed on the mounting table 80. The fixed body 70 has a support cylinder 72 for supporting the rod 71. The support cylinder 72 may be disposed on a flange portion 70a of a cylinder main body 700. The rod 71 passes through the inside of the support cylinder 72. In other words, the mounting table 80 and the rod 71 are movable relative to the support cylinder 72. A buffer member 8 may be disposed between the support cylinder 72 and the adhesive application means 6, more specifically, between the upper surface of the support cylinder 72 and the lower surface of the mounting table 80. The buffer member 8 may be disposed on the outer periphery of the rod 71. The other configurations are the same as those of embodiments 1 and 2.

[0046] 5 is an explanatory diagram showing the main parts of a manufacturing apparatus 1 for a laminated core 4 according to a fourth embodiment of the present invention. In the first to third embodiments, the advance / retract drive unit 7 has been described as a hydraulic cylinder. However, the adhesive application means 6 may be advanced and retracted by any other configuration.

[0047] 5 , the advance / retreat drive unit 7 is configured with a slide cam mechanism having a first cam member 73 that is slidable in the horizontal direction and a second cam member 74 that is driven in the vertical direction in response to the sliding of the first cam member 73. The first cam member 73 and the second cam member 74 may be disposed inside the lower mold 131. For example, the first cam member 73 and the second cam member 74 may be housed in a recess formed in the lower surface of the lower mold 131. Alternatively, the first cam member 73 and the second cam member 74 may be placed on the upper surface of the bolster 133.

[0048] The second cam member 74 may be connected to the adhesive application means 6. A mounting table 80 may be fixed to the upper surface of the second cam member 74, and the adhesive application means 6 may be placed on the mounting table 80 via a buffer member 8.

[0049] The first cam member 73 and the second cam member 74 may have inclined surfaces 73a, 74a adjacent to each other, and the inclined surfaces 73a, 74a may convert horizontal displacement of the first cam member 73 into vertical displacement of the second cam member 74. In the illustrated embodiment, when the first cam member 73 is slid to the right in the figure by the driving means 76, the second cam member 74 is slid upward in the figure, bringing the adhesive application means 6 closer to the steel sheet 2. The lower mold 131 or the bolster 133 may be provided with a first guide rail 77 that guides the horizontal sliding of the first cam member 73. In addition, the lower mold 131 or the bolster 133 may be provided with a second guide rail 78 that guides the vertical displacement of the second cam member 74.

[0050] A biasing body 79 may be connected to one end of the first cam member 73, and when the pressure on the first cam member 73 by the drive means 76 is released, the biasing body 79 may cause the first cam member 73 to slide horizontally. In the illustrated embodiment, when the drive means 76 slides the first cam member 73 to the right in the figure, the biasing body 79 is compressed, and when the pressure on the first cam member 73 by the drive means 76 is released, the biasing body 79 is restored to its original state, causing the first cam member 73 to slide to the left in the figure. The biasing body 79 may be positioned anywhere, but may be positioned between one end of the first cam member 73 and the second guide rail 78 as in the illustrated embodiment. The other configurations are the same as those of Embodiments 1 to 3.

[0051] Embodiment 5. Figure 6 is an explanatory diagram showing the main parts of the manufacturing apparatus 1 for laminated cores 4 according to embodiment 5 of the present invention. In embodiment 1, it has been described that an adhesive reservoir 62 is provided inside the adhesive application means 6. However, as shown in Figure 6, the adhesive reservoir 62 may be omitted.

[0052] In the embodiment shown in Figure 6, the inside of the holding portion 61 is provided with a plurality of insertion holes 613 through which the tubes 63 are inserted. The discharge portion 60 is configured from a cap-shaped member. The discharge portion 60 may have a shape in which the rear end is wider than the front end. The discharge portion 60 is fitted into the front ends of the insertion holes 613. The front ends of the tubes 63 are directly connected to the discharge portion 60, so that the adhesive supplied from the tubes 63 can protrude from the front ends of the passages 60a of the discharge portion 60. The other configurations are the same as those of the first to fourth embodiments.

[0053] In the first to fifth embodiments, the adhesive application means 6 has been described as being housed in the through-hole 131c of the lower mold 131. However, the adhesive application means 6 may be housed in a through-hole that passes through the upper mold 130 between the inner and outer surfaces.

[0054] Furthermore, the advance / retract drive unit 7 may be arranged to advance / retract the adhesive application means 6 housed in the through-hole of the upper mold 130. In this case, the cylinder body 700 (Embodiments 1 to 3) or the first cam member 73 and the second cam member 74 (Embodiments 4 and 5) of the advance / retract drive unit 7 may be arranged outside the outer surface of the upper mold 130.

[0055] A manufacturing method of a laminated core 4 according to an embodiment of the present invention includes manufacturing the laminated core 4 using the above-described manufacturing apparatus 1 for a laminated core 4. The manufacturing method of a laminated core 4 includes a step of applying adhesive to portions of a steel sheet 2 corresponding to the core thin sheets 3 using an adhesive application means 6, and a step of switching whether or not to apply adhesive by the adhesive application means 6 by moving the adhesive application means 6 forward and backward relative to the steel sheet 2 using an advance / retract drive unit 7, the adhesive application means 6 is provided with a passage 60a through which the adhesive passes and has a discharge unit 60 configured to discharge adhesive from the tip of the passage 60a, the adhesive application means 6 or the discharge unit 60 is made of a solid or non-porous organic resin member, the passage 60 is formed by a wall surface of the solid or non-porous organic resin, and the adhesive application means 6 is arranged so that, when the adhesive is applied, the adhesive discharged from the tip of the discharge unit 60 comes into contact with the steel sheet 2 in accordance with the up and down movement of the steel sheet 2 associated with punching out the core thin sheets 3 from the steel sheet 2.

[0056] Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person skilled in the art to which the present invention pertains can conceive of various modifications and alterations within the scope of the technical ideas set forth in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

[0057] The invention described in this specification can also be described as follows: [1] A laminated core manufacturing device for manufacturing a laminated core in which a predetermined shape of core thin plates is punched out from a steel plate and a predetermined number of the core thin plates are stacked and bonded together, the device comprising: adhesive application means for applying adhesive to portions of the steel plate corresponding to the core thin plates, and an advance / retract drive unit for moving the adhesive application means back and forth relative to the steel plate to switch whether or not the adhesive application means applies the adhesive, the adhesive application means having a passage through which the adhesive passes and a discharge part configured to discharge the adhesive from a tip of the passage, the adhesive application means or the discharge part being made of an organic resin member, and the adhesive application means is positioned so that, when the adhesive is applied, the adhesive discharged from the tip of the discharge part comes into contact with the steel plate in accordance with the up and down movement of the steel plate associated with punching out the core thin plates from the steel plate. [2] The laminated iron core manufacturing device according to paragraph 1, wherein an adhesive reservoir for storing the adhesive is provided inside the adhesive application means, the adhesive reservoir is connected to the passage of the discharge part, and the adhesive stored in the adhesive reservoir is supplied to the tip of the passage. [3] The laminated iron core manufacturing device according to paragraph 1 or 2, further comprising a buffer member that allows displacement of the adhesive application means in the forward and backward directions. [4] The laminated core manufacturing device according to any one of items 1 to 3, wherein the organic resin is polyacetal (POM), polyamide (PA), polycarbonate (PC), modified polyphenylene ether (m-PPE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), polysulfone (PSU), polyethersulfone (PES), polyarylate (PAR), polyamideimide (PAI), polyetheretherketone (PEEK), polytetrafluoroethylene (PTEF), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), or polystyrene (PS).[5] The laminated core manufacturing apparatus according to any one of items 1 to 4, wherein the adhesive application means is disposable. [6] A laminated core manufacturing method, comprising manufacturing the laminated core using the laminated core manufacturing apparatus according to any one of items 1 to 4.

[0058] REFERENCE SIGNS LIST 1: Manufacturing device 2: Steel plate 3: Iron core thin plate 4: Laminated iron core 6: Adhesive application means 60: Discharge portion 60a: Passage 61: Holding portion 61a: End face 611a: End face 62: Adhesive reservoir 7: Advance / retreat drive portion 70: Fixed body 71: Rod 73: First cam member 74: Second cam member 8: Cushioning member 50: Punching portion 130: Upper die 131: Lower die 131a: Inner surface 131b: Outer surface 131c: Through hole

Claims

1. A device for producing a laminated core, in which core sheets having a given shape are formed by cutting from a steel sheet, and a given number of said core sheets are laid and connected, comprising: an adhesive applicator that applies adhesive to the areas of the steel sheet corresponding to the core sheets; a reciprocating drive portion that makes the adhesive applicator reciprocate relative to the steel sheet to switch whether the adhesive is applied by the adhesive applicator or not, wherein the adhesive applicator comprises a discharge portion to which a passage is provided through which the adhesive passes, and which is configured to discharge the adhesive from the end of the passage, wherein the adhesive applicator or outlet portion comprises a solid or non-porous organic polymer element, and the passage is defined by walls of the solid or non-porous organic polymer, and When applying the adhesive, the adhesive applicator is positioned so that the adhesive discharged from the end of the discharge portion comes into contact with the steel sheet in response to the up and down movement of the steel sheet accompanying the formation of the core sheets by cutting from the steel sheet.

2. A device for producing a laminated core according to claim 1, wherein the inner part of the adhesive applicator comprises an adhesive reservoir for storing the adhesive, wherein the adhesive reservoir is in communication with the passage of the outlet portion, and the adhesive applicator is designed so that the adhesive stored in the adhesive reservoir is supplied to the end of the passage.

3. A device for producing a laminated core according to claim 1, further comprising a buffer element that allows the adhesive applicator to be displaced in the direction of the reciprocating movement.

4. A device for producing a laminated core according to claim 1, wherein the organic polymer is polyacetal (POM), polyamide (PA), polycarbonate (PC), modified polyphenylene ether (m-PPE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), polysulfone (PSU), polyethersulfone (PES), polyarylate (PAR), polyamide-imide (PAI), polyetheretherketone (PEEK), polytetrafluoroethylene (PTFE), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC) or polystyrene (PS).

5. A device for producing a laminated core according to claim 1, wherein the adhesive applicator is disposable.

6. A method for manufacturing a laminated core, comprising manufacturing the laminated core using a manufacturing device according to any one of paragraphs 1-5.