Manufacturing device and manufacturing method for laminated iron core

Abstract

Provided are a manufacturing device and a manufacturing method for a laminated iron core, which are capable of more easily assembling an adhesive application means and shortening a time required for maintenance. A manufacturing device 1 for a laminated iron core 4 according to the present invention includes: an adhesive application means 6 for applying an adhesive to a region corresponding to an iron core thin plate 3 of a steel plate 2; a forward / backward drive unit 7 for switching whether or not to perform application of the adhesive by the adhesive application means 6; and a buffer member 8 for allowing displacement of the adhesive application means 6 in a forward / backward direction. The adhesive application means 6 has a discharge unit 60 configured to discharge the adhesive from the tip of the passage 60a. The adhesive application means 6 is disposed so that, when the adhesive is applied, the adhesive discharged from the tip of the discharge unit 60 is brought into contact with the steel plate 2 according to the vertical movement of the steel plate 2 in association with the punching formation of the iron core thin plate 3 from the steel plate 2. The adhesive application means 6 is configured so that the contact pressure of the tip to the steel plate 2 is adjusted by the buffer member 8.

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 in which a predetermined number of thin core sheets are laminated and bonded together by punching thin core sheets of a predetermined shape from a steel sheet.

[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 adhesive application 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-mentioned Patent Document 1, the execution or non-execution of the adhesive application process is switched by moving the adhesive discharge unit back and forth. 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 constituent parts of the metal formed product, and generally, metal formed products that can have high shape accuracy are used as the constituent parts of the adhesive discharge unit.

[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 an apparatus for manufacturing a laminated core by punching out thin iron core plates of a predetermined shape from a steel plate and manufacturing a laminated 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, 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, and a buffer member for allowing displacement of the adhesive application means in the advance / retract direction, the adhesive application means having a passage through which the adhesive passes and a discharge section configured to discharge adhesive from the tip of the passage, the adhesive application means being 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 thin iron core plates from the steel plate, and the buffer member is configured to adjust the contact pressure of the tip with 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 is positioned so that when adhesive is applied, the adhesive ejected from the tip of the ejection section comes into contact with the steel plate in accordance with the up and down movement of the steel plate associated with punching out and forming the iron core thin plate from the steel plate, and the contact pressure of the tip with the steel plate is adjusted by the buffer member.Therefore, even if a misalignment occurs in the vertical position of the adhesive application means relative to the steel plate, the buffer member can absorb the misalignment, 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 positioned 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 its 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 of 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 includes an adhesive application means 6 , a forward / backward driving section 7 , and a buffer member 8 .

[0022] The adhesive application means 6 is for applying adhesive to portions of the steel sheet 2 that correspond 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] The buffer member 8 is a member for allowing displacement of the adhesive application means 6 in the advancing and retreating direction D2. The buffer member 8 can allow displacement of the adhesive application means 6 in the up and down direction.

[0026] 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.

[0027] 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 accordance with the up and down movement of the steel plate 2 associated with punching out and forming the iron core thin plate 3 from the steel plate 2, and the contact pressure of the tip with the steel plate 2 is adjusted by the buffer member 8.

[0028] If the buffer member 8 is not provided, 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 great 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, it is necessary to disassemble the adhesive applicator 6 and reassemble it 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 even slightly, the amount of adhesive that adheres to the steel plate 2 may vary depending on the properties of the adhesive, and there is a risk that adhesion may or may not occur. If the buffer member 8 is not provided in this way, 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 contact pressure of the tip of the adhesive applicator 6 with the steel plate 2 is adjusted by the buffer member 8, so even if a misalignment occurs in the vertical position of the adhesive applicator 6 with respect to the steel plate 2, the buffer member 8 can absorb the misalignment. This makes it easier to assemble the adhesive applicator 6 and shortens the time required for maintenance. The adhesive applicator 6 of this embodiment may be positioned so that the tip of the discharge portion 60 comes into contact with the steel plate 2 in accordance with the vertical movement of the steel plate 2 that accompanies the punching of the iron core thin plate 3 from the steel plate 2.

[0029] When adhesive is dispensed from the tip of the discharge portion 60 and applied to the steel plate 2, the steel plate 2 moves up and down due to being pressed by the upper die. If the steel plate 2 descends excessively, the discharge portion 60 is pressed down. The function of the buffer member 8 is to displace the discharge portion 60 downward in response to the steel plate 2 being pressed down. If the steel plate 2 contacts the discharge portion 60 with excessive contact pressure, this can cause problems such as wear and damage to the discharge portion 60, or the appropriate amount of adhesive cannot be applied. Therefore, the buffer member 8 elastically displaces the discharge portion 60, preventing such problems and ensuring the appropriate amount of adhesive is applied. That is, the contact pressure between the steel plate 2 and the discharge portion 60 is adjusted by appropriately selecting the elasticity of the buffer member 8. Because the contact pressure is also affected by the viscosity of the adhesive, it is preferably adjusted depending on the type of adhesive and the area to be applied. Furthermore, the buffer member 8 is preferably configured to allow the discharge portion 60 to move up and down quickly. Examples of the buffer member 8 that can be used include a spring, an air cylinder, and a rubber buffer.

[0030] As particularly shown in Figure 2, the adhesive application means 6 further has 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.

[0031] The holding portion 61 may have a large diameter portion 610 and a small diameter portion 611 protruding from an end face of the large diameter portion 610. The outer diameter of the small diameter portion 611 is smaller than that of the large diameter portion 610. The large diameter portion 610 and the small diameter portion 611 may be coaxial with each other. Multiple nozzles (discharge portions 60) may be provided protruding from an end face 611a of the small diameter portion 611. If multiple nozzles were provided individually, each nozzle would require its own buffer member 8. In contrast, by holding multiple nozzles as the discharge portion 60 in the holding portion 61 as in the present embodiment, the buffer member 8 can be consolidated into one, thereby simplifying the structure. A step 612 is formed by the end face 610a of the large diameter portion 610 and the circumferential surface 611b of the small diameter portion 611. The step 612 may be provided over the entire circumferential area of ​​the large diameter portion 610 and the small diameter portion 611.

[0032] 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 sheet 2, and the outer surface 131b may be the surface that is placed on the bolster 133.

[0033] As particularly shown in FIG. 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 applicator 6 on the inner surface 131a side can be determined by the positioning protrusion 131d. The positioning protrusion 131d may be abutted against the step portion 612 of the holding portion 61 by the biasing force of the buffer member 8, thereby restricting movement of the adhesive applicator 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 or part of the circumferential area of ​​the through hole 131c. 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 abuts against the adhesive application means 6 or its step portion 612, a shrinkage allowance remains in the buffer member 8, and the adhesive application means 6 can move downward when it receives an input from above. At the upper limit position of the adhesive application means 6, 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.

[0034] 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.

[0035] 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 may be fixed to the upper end of the rod 71. A mounting table 80 is fixed to the upper part of the buffer member 8. A pressure sensor 81 is attached to the mounting table 80, and the adhesive application means 6 is placed 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] Embodiment 5. Figure 6 is an explanatory diagram showing the main parts of a manufacturing apparatus 1 for a laminated core 4 according to embodiment 5 of the present invention. In embodiments 1 to 4, it has been described that the buffer member 8 is disposed between the adhesive application means 6 and the advance / retract drive unit 7, etc. However, as shown in Figure 6, the buffer member 8 may be disposed between the adhesive application means 6 and the positioning protrusion 131d. The buffer member 8 may be disposed on a step portion 612 of the adhesive application means 6. Although Figure 6 shows the advance / retract drive unit 7 as a slide cam mechanism, the same applies when the advance / retract drive unit 7 is a hydraulic cylinder. The rest is the same as in embodiments 1 to 4.

[0045] 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.

[0046] 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.

[0047] 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 the laminated core 4 includes a step of applying adhesive to portions of the steel plate 2 corresponding to the thin core sheets 3 using an adhesive applicator 6, and a step of switching whether or not to apply adhesive by the adhesive applicator 6 by moving the adhesive applicator 6 forward and backward relative to the steel plate 2 using an advance / retract driver 7, wherein displacement of the adhesive applicator 6 in the advance / retract direction D2 is permitted by a buffer member 8, the adhesive applicator 6 is provided with a passage 60a through which the adhesive passes and has a discharge section 60 configured to discharge adhesive from the tip of the passage 60a, the adhesive applicator 6 is positioned 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 accordance with the up and down movement of the steel plate 2 accompanying the punching of the thin core sheets 3 from the steel plate 2, and the contact pressure of the tip of the discharge section 60 with the steel plate 2 is adjusted by the buffer member 8.

[0048] 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.

[0049] 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 iron core thin plates is punched out from a steel plate and a predetermined number of the iron core thin plates are stacked and bonded together, comprising: adhesive application means for applying adhesive to portions of the steel plate corresponding to the iron core thin plates; 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 by the adhesive application means is performed; and a buffer member for allowing displacement of the adhesive application means in the advance / retract direction, wherein the adhesive application means has a passage through which the adhesive passes and a discharge part configured to discharge the adhesive from a tip of the passage, and the adhesive application means is arranged 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 accompanying the punching out of the iron core thin plates from the steel plate, The laminated iron core manufacturing device according to claim 1, wherein the adhesive application means further has a holding part that holds the discharge part, and the discharge part is provided so as to protrude from the end face of the holding part. [3] The laminated core manufacturing device according to item 1 or 2, which is constituted by dies consisting of upper and lower dies, and further comprises a punching section for punching the iron core thin plates from the steel plate, the adhesive application means is housed in a through hole that penetrates between the inner and outer surfaces of the upper or lower die, the inner and outer surfaces being surfaces of the upper or lower die that are separated in the vertical direction, the inner surface being the surface facing the steel plate, and at least one positioning protrusion that protrudes radially inward of the through hole is provided at an end on the inner surface side of the through hole, and the position of the adhesive application means on the inner surface side is determined by the positioning protrusion. [4] The laminated core manufacturing device according to item 3,[5] The laminated iron core manufacturing device according to any one of paragraphs 1 to 4, wherein the advance / retract drive unit is a hydraulic cylinder having a fixed body and a rod provided so as to be able to advance and retract relative to the fixed body. [6] The laminated iron core manufacturing device according to paragraph 5, wherein the buffer member is arranged between the rod and the adhesive application means, or between a mounting table fixed to the rod and the fixed body. [7] The laminated iron core manufacturing device according to any one of paragraphs 1 to 4, wherein the advance / retract drive unit is a slide cam mechanism having a first cam member provided so as to be able to slide horizontally, and a second cam member driven in the vertical direction in response to the sliding of the first cam member. [8] The laminated iron core manufacturing device according to paragraph 7, wherein the buffer member is arranged between the second cam member and the adhesive application means. [9] The laminated core manufacturing device according to item 7 or 8, further comprising a punching section configured by dies consisting of an upper die and a lower die, for punching the core thin plates from the steel plate, the first cam member and the second cam member being disposed within the upper die or the lower die.

[10] A laminated core manufacturing method, including manufacturing the laminated core using the laminated core manufacturing device according to any one of items 1 to 9.

[0050] 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 surface 611a: End surface 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 laminated core manufacturing apparatus for punching out thin iron core plates of a predetermined shape from a steel plate and manufacturing a laminated core in which a predetermined number of the thin iron core plates are stacked and bonded together, comprising: an adhesive application means for applying adhesive to portions of the steel plate corresponding to the thin iron core plates; 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; and a buffer member for allowing displacement of the adhesive application means in the advance / retract direction, wherein the adhesive application means has a passage through which the adhesive passes and a discharge section configured to discharge the adhesive from the tip of the passage, the adhesive application means is positioned so that when the 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 thin iron core plates from the steel plate, and the buffer member is configured to adjust the contact pressure of the tip with the steel plate.

2. The laminated core manufacturing device according to claim 1, wherein said adhesive application means further has a holding portion for holding said discharge portion, said discharge portion being provided so as to protrude from an end face of said holding portion.

3. A laminated core manufacturing device as described in claim 1, comprising a die consisting of an upper die and a lower die, and further comprising a punching section for punching the thin iron core plate from the steel plate, the adhesive application means is housed in a through hole that penetrates between the inner and outer surfaces of the upper die or lower die, the inner surface and outer surface being surfaces of the upper die or lower die that are separated in the vertical direction, the inner surface being the surface facing the steel plate, and at least one positioning protrusion is provided on the end on the inner surface side of the through hole that protrudes radially inward of the through hole, and the position of the adhesive application means on the inner surface side is determined by the positioning protrusion.

4. The laminated core manufacturing device according to claim 3, wherein the buffer member is disposed between the adhesive application means and the positioning projections.

5. The laminated core manufacturing device according to claim 1, wherein the advance / retract drive unit is a hydraulic cylinder having a fixed body and a rod that is provided so as to be able to advance and retreat relative to the fixed body.

6. The laminated core manufacturing device according to claim 5, wherein the buffer member is disposed between the rod and the adhesive application means, or between a mounting table fixed to the rod and the fixed body.

7. A laminated core manufacturing device as described in claim 1, wherein the advance / retreat drive unit is a slide cam mechanism having a first cam member arranged to be slidable in the horizontal direction, and a second cam member driven in the vertical direction in response to the sliding of the first cam member.

8. The manufacturing device for a laminated core according to claim 7, wherein the buffer member is disposed between the second cam member and the adhesive applying means.

9. A laminated core manufacturing device as described in claim 7, further comprising a punching section configured by a die consisting of an upper die and a lower die for punching out the thin iron core plate from the steel plate, and the first cam member and the second cam member are disposed within the upper die or the lower die.

10. An apparatus for manufacturing laminated cores, for punching out thin iron core plates of a predetermined shape from a steel plate and manufacturing a laminated core in which a predetermined number of the thin iron core plates are stacked and bonded together, comprising: an adhesive application means for applying adhesive to portions of the steel plate corresponding to the thin iron core plates; an advance / retract drive section 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; and a buffer member for allowing displacement of the adhesive application means in the advance / retract direction, wherein the adhesive application means is provided with a passage through which the adhesive passes and has a discharge section configured to discharge the adhesive from an end of the passage, and the adhesive application means is positioned so that when the adhesive is applied, adhesive discharged from the end 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 thin iron core plates from the steel plate, and the adhesive application means further has a holding section for holding the discharge section, the discharge section being provided so as to protrude from an end face of the holding section.

11. A method for manufacturing a laminated core, comprising manufacturing the laminated core using the laminated core manufacturing apparatus according to any one of claims 1 to 10.

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