Manufacturing method and manufacturing device for laminate iron core
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2026-02-05
- Publication Date
- 2026-08-13
Smart Images
Figure JP2026004225_13082026_PF_FP_ABST
Abstract
Description
Manufacturing Apparatus and Method for Laminated Core
[0001] The present invention relates to a manufacturing apparatus and method for a laminated core for manufacturing a core plate by punching from a steel sheet and manufacturing a laminated core using the core plate.
[0002] For cores or iron cores used in rotating electrical machines, laminated cores in which a predetermined number of core plates are laminated are used. The core plates are joined to each other by various methods. When caulking and welding are used as joining methods, the magnetic properties of the laminated core may deteriorate due to mechanical stress or thermal stress during joining and interlayer short circuits, and the performance of the laminated core may not be fully exhibited. Therefore, as shown in Patent Document 1 below, etc., attempts have been made to laminate and bond the core plates.
[0003] Patent Document 1 describes a manufacturing apparatus for a laminated core, which has an upper die and a lower die, a progressive die means for sequentially punching core plates from a strip-shaped thin steel sheet that is intermittently transferred, and an adhesive application device incorporated in the lower die for applying an adhesive to a portion corresponding to the core plate of the strip-shaped thin steel sheet. The adhesive application device has an adhesive discharge portion including a nozzle block having a plurality of discharge holes opened on the upper surface, and an adhesive supply portion for discharging the adhesive from the plurality of discharge holes by supplying the adhesive to the adhesive discharge portion at a predetermined pressure. Further, a forward and backward drive portion for moving the adhesive discharge portion forward and backward with respect to the adhesive application surface of the strip-shaped thin steel sheet is incorporated in the lower die together with the adhesive application device. By advancing and retreating the adhesive discharge portion by the forward and backward drive portion, the execution or non-execution of the adhesive application process by the adhesive discharge portion can be switched. At the position of the core plate where the adhesive is not applied, a laminated core composed of a predetermined number of core plates is separated from the core plate group.
[0004] Patent Document 2 discloses "an adhesive application facility for applying an adhesive to a strip-shaped thin steel sheet in order to laminate and bond cores punched into a predetermined shape by a die, the adhesive application facility being arranged immediately before the die or between the die and a subsequent die in the feeding direction of the strip-shaped thin steel sheet, and the adhesive application facility being capable of being pulled out in a direction perpendicular to the feeding direction of the strip-shaped thin steel sheet".
[0005] Japanese Patent Publication No. 2017-216873 Japanese Patent Publication No. 2023-124680
[0006] In the conventional configuration disclosed in Patent Document 1, the adhesive application device is incorporated into the lower mold. However, the space between the lower mold and the upper mold is narrow, making it difficult to perform maintenance on the adhesive application device from the top surface of the lower mold while the lower mold is incorporated into the manufacturing equipment. For this reason, in the conventional configuration, it is necessary to separate the lower mold from the manufacturing equipment in order to perform maintenance on the adhesive application device, which reduces the maintainability of the adhesive application device.
[0007] Patent Document 2 discloses a configuration in which an adhesive application device (adhesive application equipment) is pulled out. When adopting such a configuration, it is conceivable to divide the lower die into front and rear sections and place the adhesive application device between the front and rear sections of the lower die. In such an arrangement, the front and rear sections of the lower die may bend in a way that causes them to tilt towards the space in which the adhesive application device is placed, which may reduce the accuracy of punching out the iron core plate.
[0008] The present invention was made to solve the above-mentioned problems, and one of its objectives is to provide a laminated iron core manufacturing apparatus and manufacturing method that can improve the maintainability of an adhesive application apparatus. Another objective of the present invention is to provide a laminated iron core manufacturing apparatus and manufacturing method that can suppress the decrease in accuracy of punching out the iron core plate.
[0009] The laminated core manufacturing apparatus according to the present invention, in one embodiment, is a laminated core manufacturing apparatus for punching out core plates from a steel sheet and manufacturing a laminated core using the core plates, comprising an adhesive application apparatus for applying adhesive to the portion of the steel sheet corresponding to the core plate, and a die including an upper die and a lower die for punching out the core plate from the steel sheet after the adhesive application apparatus has applied the adhesive, the lower die being attached to a lower die base, the lower die base being provided with a movable part that is movable in the horizontal direction, and the adhesive application apparatus being provided to be movable integrally with the movable part and can be pulled out horizontally from the lower die The device is configured such that the lower die includes a lower die pre-processing section that punches out parts of the steel plate other than the outer shape of the core plate, and a lower die outer shape punching section located downstream of the lower die pre-processing section in the direction of feeding the steel plate, which punches out the outer shape of the core plate from the steel plate. The movable section is located between the lower die pre-processing section and the lower die outer shape punching section, and the movable section includes a bottom wall and a pair of side walls extending upward from both sides of the bottom wall. The adhesive application device is housed in the internal space of the movable section, which is partitioned by the bottom wall and the pair of side walls, and the pair of side walls are provided in contact with the sides of the lower die pre-processing section and the sides of the lower die outer shape punching section.
[0010] In one embodiment, the method for manufacturing a laminated iron core according to the present invention includes manufacturing a laminated iron core using the above-described laminated iron core manufacturing apparatus.
[0011] According to one embodiment of the manufacturing apparatus and manufacturing method for laminated iron cores of the present invention, the adhesive application device is configured to be able to be pulled out horizontally from the lower die, thereby improving the maintainability of the adhesive application device. Furthermore, since a pair of side walls are provided in contact with the side surface of the pre-processing section of the lower die and the side surface of the outer shape punching section of the lower die, a decrease in the accuracy of punching and forming the iron core plate can be suppressed.
[0012] This is an explanatory diagram showing a laminated core manufacturing apparatus according to Embodiment 1 of the present invention. This is a plan view showing the lower mold in Figure 1. This is a side view of the lower mold in Figure 2. This is a cross-sectional view of the lower mold along line IV-IV in Figure 2. This is an explanatory diagram showing a laminated core manufacturing apparatus according to Embodiment 2 of the present invention. This is an explanatory diagram showing a modified example of the manufacturing apparatus in Figure 5. This is an explanatory diagram showing a laminated core manufacturing apparatus according to Embodiment 3 of the present invention. This is an explanatory diagram showing the drive device in Figure 7 in more detail. This is a perspective view showing the operating pin and guide member in Figure 8. This is an explanatory diagram showing a first modified example of the guide member in Figure 8. This is an explanatory diagram showing a second modified example of the guide member in Figure 8. This is an explanatory diagram showing a third modified example of the guide member in Figure 8. This is a perspective view showing the guide member and base in Figure 12. This is an explanatory diagram showing a fourth modified example of the guide member in Figure 8. This is a perspective view showing the guide member and base in Figure 14. This is an explanatory diagram showing an example of the connection of the operating pin and the second cam member in Figure 8. This is an explanatory diagram showing a modified example of the absorbent member in Figure 16.
[0013] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to each embodiment, and can be materialized by modifying the components without departing from the spirit of the invention. Furthermore, various inventions can be formed by appropriately combining the multiple components disclosed in each embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, components from different embodiments may be appropriately combined.
[0014] Embodiment 1. Figure 1 is an explanatory diagram showing a manufacturing apparatus 1 for laminated iron core 4 according to Embodiment 1 of the present invention. The manufacturing apparatus 1 shown in Figure 1 is an apparatus for punching out an iron core plate 3 from a steel plate 2 and manufacturing a laminated iron core 4 using the iron core plate 3.
[0015] As shown in Figure 1, the manufacturing apparatus 1 of this embodiment includes a reel 10, a feeding device 11, an oiling device 12, and a press machine 13. A coil of steel sheet 2 is mounted on the reel 10. The steel sheet 2 drawn from the reel 10 is sent to the press machine 13 through the feeding device 11. The oiling device 12 is positioned between the feeding device 11 and the press machine 13 and supplies press oil to the surface of the steel sheet 2 before it is introduced into the press machine 13. The press machine 13 includes an upper die 130 and a lower die 131, which punch out the iron core plate 3 from the steel sheet 2.
[0016] The manufacturing apparatus 1 of this embodiment includes an adhesive application device 14, a mold 15, a lamination section 16, and a separation section 17.
[0017] The adhesive application device 14 applies adhesive to the portion of the steel plate 2 corresponding to the core plate 3. The adhesive application device 14 may be built into the lower die 131 and may apply adhesive to the lower surface of the steel plate 2. A liquid supply device 140 is connected to the adhesive application device 14, and the adhesive application device 14 applies adhesive from the liquid supply device 140.
[0018] The die 15 punches out the core plate 3 from the steel plate 2. The die 15 includes an upper die 130 and a lower die 131. The punching of the steel plate 2 by the die 15 is carried out in multiple stages. That is, the steel plate 2 is punched out sequentially in the feeding direction D1 of the steel plate 2 toward the final core plate 3. The punching of the steel plate 2 by the die 15 includes a pre-processing step in which the parts of the steel plate 2 other than the outer shape (other than the outer circumference) of the core plate 3 are punched out, and an outer shape punching step which punches out the outer shape of the core plate 3 from the steel plate 2 after the pre-processing step. The outer shape punching is performed last, and the core plate 3 is punched out of the steel plate 2 when the outer shape of the core plate 3 is punched out.
[0019] The adhesive is applied by the adhesive application device 14 before the core plate 3 is finally punched out from the steel plate 2, that is, when pre-processing is performed or before the outer shape punching is performed. In other words, the punching of the core plate 3 from the steel plate 2 by the die 15 is performed after the adhesive is applied by the adhesive application device 14. The adhesive can be applied at any point between the time the guide pin holes are punched out in the steel plate 2 and the time the stator outer shape is punched out and enters the laminated section 16. The most suitable placement for the adhesive application device 14 is immediately before the outer shape punching.
[0020] The laminated section 16 is the part for forming a group of iron core plates 3a by laminating and bonding iron core plates 3 with adhesive applied. The laminated section 16 may be built into the lower die 131 at the position where the outer shape punching is performed by the die 15. The group of iron core plates 3a is formed by laminating and bonding multiple iron core plates 3. An iron core plate 3 is placed on top of a group of iron core plates 3a formed by iron core plates 3 punched out earlier, and bonded by the weight of the iron core plate 3 itself or subsequent iron core plates 3, and by the pressure of the upper die 130, as the adhesive hardens and the iron core plate 3 comes into close contact with the upper surface of the group of iron core plates 3a. The upper die 130 may be provided with a projection that pushes down and pressurizes the iron core plate 3 on top of the group of iron core plates 3a by the thickness of one iron core plate 3.
[0021] The separation section 17 is the part that separates the laminated core 4 from the core plate group 3a. Although not limited, the separation section 17 can separate the laminated core 4 by biting between adjacent core plates 3 within the core plate group 3a. The separation section 17 may be built into the lower die 131 so as to be located to the side of the laminated section 16. For example, the separation of the laminated core 4 by the separation section 17 is performed once every time a plurality of core plates 3, such as 200, are punched out. In other words, the frequency of separation of the laminated core 4 is less than the frequency of punching out the core plates 3.
[0022] The laminated cores 4, separated from the core plate group 3a by the separation unit 17, are sent out from the laminated unit 16 by the transport device 18.
[0023] Next, Figure 2 is a plan view of the lower mold 131 shown in Figure 1, Figure 3 is a side view of the lower mold 131 shown in Figure 2, and Figure 4 is a cross-sectional view of the lower mold 131 along line IV-IV in Figure 2.
[0024] As is particularly evident in Figures 2 and 3, the lower die 131 is attached to the lower die base 1310. The lower die base 1310 is sometimes called the lower die set. The lower die base 1310 is provided with a movable part 20 that is movable in the horizontal direction H. The adhesive application device 14 is provided to be movable integrally with the movable part 20 and is configured to be pullable out from the lower die 131 in the horizontal direction H. The adhesive application device 14 may be mounted on the movable part 20. The movable part 20 may be mounted on the lower die base 1310.
[0025] The ratio T / L of the thickness T (mm) of the lower die base 1310 in the height direction D2 to the length L (mm) of the lower die base 1310 in the feeding direction D1 of the steel plate 2 (see Figure 3) is preferably 0.050 or more. A ratio T / L of 0.050 or more ensures the thickness of the lower die base 1310, prevents bending and deformation of the lower die 131, and ensures punching accuracy. The length L is defined as the distance between the upstream end and the downstream end of the lower die base 1310 and is measured using calipers. The thickness T is defined as the distance between the upper end surface and the lower end surface with the longest horizontal surface of the lower die base 1310 and is measured using calipers.
[0026] When the length L is 1000 mm, the thickness T may be 100 mm or more (ratio T / L is 0.100 or more). For example, when the length L is 1000 mm, the thickness T is 135 mm.
[0027] When the length L is 2000 mm, the thickness T may be 150 mm or more (ratio T / L of 0.075 or more). For example, when the length L is 2000 mm, the thickness T is 160 mm.
[0028] When the length L is 3000 mm, the thickness T may be 200 mm or more (ratio T / L of 0.067 or more). For example, when the length L is 3000 mm, the thickness T is 210 mm.
[0029] When the length L is 4000 mm, the thickness T may be 200 mm or more (ratio T / L of 0.050 or more). For example, when the length L is 4000 mm, the thickness T is 210 mm.
[0030] As shown in Figure 1, the space between the lower mold 131 and the upper mold 130 is narrow, making it difficult to perform maintenance on the adhesive application device 14 from the top surface of the lower mold 131 while the lower mold 131 is incorporated into the manufacturing apparatus 1. For this reason, conventionally, it was necessary to separate the lower mold 131 from the manufacturing apparatus 1 in order to perform maintenance on the adhesive application device 14, which reduced the maintainability of the adhesive application device 14.
[0031] The inventors conducted various studies on the adhesive application device 14 and obtained the following new findings. Specifically, while extremely high precision is required for punching out the iron core plate 3 and for the amount of adhesive applied to the iron core plate 3, a certain degree of deviation is permissible for the position of adhesive application within the iron core plate 3, and it was found that the iron core plate 3 can be properly laminated and bonded even if the adhesive application device 14 is configured to be movable in the horizontal direction. By making the adhesive application device 14 pullable out horizontally H from the lower mold 131, as in the manufacturing apparatus 1 of this embodiment, the maintainability of the adhesive application device 14 can be improved. That is, maintenance work on the adhesive application device 14 can be performed without separating the lower mold 131 from the manufacturing apparatus 1.
[0032] The horizontal direction H from which the adhesive application device 14 can be pulled out may be a direction intersecting the feeding direction D1 of the steel plate 2, or a direction perpendicular to the feeding direction D1 of the steel plate 2. The horizontal direction H may be the direction from top to bottom in Figure 2. Hereinafter, the horizontal direction H from which the adhesive application device 14 can be pulled out may be referred to as the pulling direction of the adhesive application device 14 or the horizontal direction in the narrow sense.
[0033] As is particularly evident in Figure 2, the piping 141 from the liquid supply device 140 is connected to the adhesive application device 14 from the outside of the lower mold 131 in the withdrawal direction of the adhesive application device 14. More specifically, the piping 141 is located on the side (front side) where the adhesive application device 14 is withdrawn. The piping 141 includes a valve 141a connected to the adhesive application device 14, a first piping 141b located between the valve 141a and the liquid supply device 140, and a second piping 141c located between the valve 141a and an air supply device (not shown).
[0034] The lower die 131 includes a lower die pre-processing section 1311 that punches out the portion of the steel plate 2 other than the outer shape of the core plate 3, and a lower die outer shape punching section 1312 located downstream of the lower die pre-processing section 1311 in the feeding direction D1 of the steel plate 2, which punches out the outer shape of the core plate 3 from the steel plate 2. The movable section 20 is located between the lower die pre-processing section 1311 and the lower die outer shape punching section 1312.
[0035] As is particularly evident in Figure 3, the movable part 20 includes a bottom wall portion 21 and a pair of side wall portions 22 extending upward from both sides of the bottom wall portion 21. The bottom wall portion 21 is a plate-like portion extending in the feeding direction D1 of the steel plate 2. The pair of side wall portions 22 are positioned apart from each other in the feeding direction D1 of the steel plate 2 so as to face each other. In other words, the movable part 20 has an outer shape that is open upward when viewed from the side. The adhesive application device 14 is housed in the internal space 23 of the movable part 20, which is partitioned by the bottom wall portion 21 and the pair of side wall portions 22. The pair of side wall portions 22 are provided in contact with the side surface SF1 of the lower die pre-processing portion 1311 and the side surface SF2 of the lower die outer shape punching portion 1312.
[0036] If the pair of side wall portions 22 were omitted from the movable portion 20, the lower die pre-processing portion 1311 and the lower die outer shape punching portion 1312 would bend towards the space where the movable portion 20 and the adhesive application device 14 are located, which could reduce the accuracy of punching out the iron core plate 3. As in this embodiment, the pair of side wall portions 22 are provided in contact with the side surface SF1 of the lower die pre-processing portion 1311 and the side surface SF2 of the lower die outer shape punching portion 1312, thereby improving the rigidity of the lower die pre-processing portion 1311 and the lower die outer shape punching portion 1312 and suppressing a decrease in the accuracy of punching out the iron core plate 3.
[0037] The side surface SF1 of the lower die pre-processing section 1311 and the side surface SF2 of the lower die outer shape punching section 1312 are surfaces that extend in the horizontal direction H and the height direction D2, and are positioned apart from each other in the feeding direction D1 of the steel plate 2 so as to face each other. The total height of the bottom wall section 21 and the side wall section 22 from the top surface of the lower die base 1310 may be the same as the height of the lower die pre-processing section 1311 and the lower die outer shape punching section 1312 from the top surface of the lower die base 1310.
[0038] In the manufacturing apparatus 1 of this embodiment, the outer surfaces of a pair of side walls 22 slide on the side surface SF1 of the lower die pre-processing section 1311 and the side surface SF2 of the lower die outer shape punching section 1312, thereby guiding the movement of the movable part 20. The lower die pre-processing section 1311 and the lower die outer shape punching section 1312 are precisely fixed to the lower die base 1310, and the side surfaces SF1 and SF2 extend with precision. By guiding the movement of the movable part 20 with these side surfaces SF1 and SF2, the positional accuracy of the movable part 20 in the feeding direction D1 of the steel plate 2 can be improved.
[0039] The manufacturing apparatus 1 of this embodiment further includes a movable part 20 related to the withdrawal direction (horizontal direction H) of the adhesive application apparatus 14 when applying adhesive to the portion of the steel plate 2 corresponding to the core plate 3, and a stopper 30 that determines the position of the adhesive application apparatus 14. By providing the stopper 30 in this way, the positional accuracy of the movable part 20 and the adhesive application apparatus 14 can be improved. The stopper 30 may be fixed to the lower die base 1310, or to the lower die pre-processing section 1311 and the lower die outer shape punching section 1312, on the rear side of the movable part 20 related to the withdrawal direction of the adhesive application apparatus 14. The position of the movable part 20 and the adhesive application apparatus 14 can be determined by abutting the rear end face of the movable part 20 against the stopper 30.
[0040] As shown in Figure 4, the manufacturing apparatus 1 of this embodiment further includes a drive device 40 that displaces the adhesive application device 14 relative to the steel plate 2 to switch whether or not to apply the adhesive. In this embodiment, the drive device 40 is provided to be movable together with the movable part 20 together with the adhesive application device 14. The drive device 40 may be mounted on the movable part 20.
[0041] The drive unit 40 can move the adhesive application device 14 forward and backward according to the number of core plates 3 to be included in the laminated core 4, so as not to apply adhesive to one of the core plates 3. The drive unit 40 can displace the adhesive application device 14 up and down so as to move it closer to and away from the steel plate 2. When the adhesive application device 14 is brought closer to the steel plate 2, adhesive is applied, and when the adhesive application device 14 is moved away from the steel plate 2, adhesive is not applied. When the adhesive application device 14 is positioned below the steel plate 2 as shown in the figure, adhesive is applied when the adhesive application device 14 is raised, and adhesive is not applied when the adhesive application device 14 is lowered.
[0042] The drive unit 40 is composed of a slide cam mechanism including an actuator 41, a first cam member 42 that is slidable in the horizontal direction H by the driving force of the actuator 41, and a second cam member 43 that is driven in the vertical direction in accordance with the sliding of the first cam member 42. In this embodiment, the first cam member 42 is slidable in the withdrawal direction of the adhesive application device 14. However, the first cam member 42 may be slidable in a direction intersecting the withdrawal direction of the adhesive application device 14. In this respect, the first cam member 42 can be understood as slidable in the horizontal direction H in a broad sense.
[0043] Here, the manufacturing apparatus 1 of this embodiment includes a buffer member 50 that allows displacement of the adhesive application device 14 in the direction toward and away from the steel plate 2. The buffer member 50 is made of, for example, a spring, an air cylinder, or rubber, and has the function of adjusting the gap between the tip of the adhesive application device 14 and the steel plate 2, and adjusting the contact pressure when the steel plate 2 and the tip of the adhesive application device 14 come into contact. The adhesive application device 14 is placed on a mounting base 51 via the buffer member 50. The mounting base 51 is fixed to the upper surface of the second cam member 43, and the second cam member 43, mounting base 51, buffer member 50, and adhesive application device 14 move up and down together as a single unit.
[0044] The first cam member 42 and the second cam member 43 may have inclined surfaces 42a and 43a at positions adjacent to each other, and the inclined surfaces 42a and 43a convert the displacement of the first cam member 42 in the horizontal direction H into the displacement of the second cam member 43 in the vertical direction. In FIG. 4, when the first cam member 42 is slid to the right side in the figure by the actuator 41, the second cam member 43 is slid upward in the figure, and the adhesive applicator 14 is brought closer to the steel plate 2.
[0045] A positioning projection 24 is provided on the movable part 20 and abuts against the upper surface of the adhesive applicator 14 when the adhesive applicator 14 is brought closer to the steel plate 2, and determines the position of the adhesive applicator 14 in the height direction D2. A clearance remains in the buffer member 50 at the upper limit position of the adhesive applicator 14 where the positioning projection 24 abuts against the upper surface of the adhesive applicator 14. When the adhesive applicator 14 receives an input from above when contacting the steel plate 2, the buffer member 50 allows the adhesive applicator 14 to escape downward.
[0046] The drive device 40 includes a first guide rail 44. The first guide rail 44 is provided on the movable part 20 and guides the slide of the first cam member 42 in the horizontal direction H. The drive device 40 also has a second guide rail 45. The second guide rail 45 is provided on the movable part 20 and guides the displacement of the second cam member 43 in the height direction D2.
[0047] The drive device 40 includes a biasing body 46 connected to one end of the first cam member 42. When the pressing of the first cam member 42 by the actuator 41 is released, the first cam member 42 may be slid in the horizontal direction H by the biasing force of the biasing body 46. In FIG. 4, when the first cam member 42 is slid to the right side in the figure by the actuator 41, the biasing body 46 is compressed, and when the pressing of the first cam member 42 by the actuator 41 is released, the first cam member 42 is slid to the left side in the figure by the restoration of the biasing body 46. The biasing body 46 may be arbitrarily arranged, but may be arranged between one end of the first cam member 42 and the second guide rail 45 as in the illustrated embodiment. The biasing body 46 may be constituted by, for example, a spring, an air cylinder, or rubber.
[0048] Embodiment 2. FIG. 5 is an explanatory view showing a manufacturing apparatus 1 for a laminated core 4 according to Embodiment 2 of the present invention. In Embodiment 1, it was described that the movement of the movable part 20 in the horizontal direction H is guided by the side surface SF1 of the lower die preprocessing part 1311 and the side surface SF2 of the lower die outer shape punching part 1312. However, the movement of the movable part 20 may be additionally or alternatively guided by other means.
[0049] The manufacturing apparatus 1 of the present Embodiment 2 includes a guide rail 60 provided on the lower die base 1310, and is configured such that the movement of the movable part 20 in the horizontal direction H is guided by the guide rail 60. The guide rail 60 may be arranged to extend in the drawing direction (horizontal direction H) of the adhesive application device 14 on both sides of the movable part 20 related to the feeding direction D1 of the steel plate 2. The guide rail 60 may be a rectangular member or part when viewed from the side as shown in FIG. 5. A groove is provided in the lower part or side part of the movable part 20, and the guide rail 60 is fitted into the groove.
[0050] The guide rail 60 of the present Embodiment 2 is a step formed on the lower die base 1310. In the illustrated aspect, a groove is provided in a part of the lower die base 1310, and the guide rail 60 is fitted into the groove. However, the guide rail 60 may be provided integrally with the lower die base 1310.
[0051] Next, FIG. 6 is an explanatory view showing a modified example of the manufacturing apparatus 1 of FIG. 5. The guide rail 60 may be provided away from the lower die base 1310. In other words, the guide rail 60 may be provided on the lower die base 1310 via other members.
[0052] In the aspect shown in FIG. 6, the lower die 130 includes a connecting part 1313 that connects the lower die preprocessing part 1311 and the lower die outer shape punching part 1312. The guide rail 60 may be provided on the connecting part 1313. The connecting part 1313 may extend in the feeding direction D1 of the steel plate 2 between the lower die preprocessing part 1311 and the lower die outer shape punching part 1312. The connecting part 1313 may be provided in contact with the upper surface of the lower die base 1310. The movable part 20 may be placed on the connecting part 1313. Other configurations are the same as those in Embodiment 1.
[0053] Embodiment 3. Figure 7 is an explanatory diagram showing a manufacturing apparatus 1 for laminated iron core 4 according to Embodiment 3 of the present invention, Figure 8 is an explanatory diagram showing the drive device 70 of Figure 7 in more detail, and Figure 9 is a perspective view showing the operating pin 73 and pin connecting member 74 of Figure 8. In Embodiment 1, the drive device 40 was described as being provided to be movable integrally with the movable part 20 together with the adhesive application device 14. However, in Embodiment 3, the drive device 70 is provided on the upper mold 130 so as to face the adhesive application device 14, as shown in Figures 7 and 8.
[0054] As shown in Figure 8, the drive unit 70 includes an actuator 71, a slide cam 72 operated by the actuator 71, and at least one actuation pin 73 extending from the upper mold 130 to the lower mold 131, which displaces the adhesive application device 14 in accordance with the movement of the slide cam 72. The actuator 71 displaces the actuation pin 73 in the vertical direction. The adhesive application device 14 is displaced in the vertical direction in accordance with the displacement of the actuation pin 73.
[0055] The actuator 71 is configured, for example, by a solenoid actuator. The slide cam 72 includes a first cam member 721 that is slidable in the horizontal direction H by the actuator 71, and a second cam member 722 that is driven vertically in accordance with the sliding of the first cam member 721. The actuation pin 73 is connected to the second cam member 722 and is displaced vertically in accordance with the displacement of the second cam member 722.
[0056] As shown in Figure 8(b), when the first cam member 721 is slid to the left by the actuator 71 from the state shown in Figure 8(a), the second cam member 722 is displaced downward. As a result of this displacement of the second cam member 722, the operating pin 73 is lowered, which moves the adhesive application device 14 away from the steel plate 2, preventing the application of adhesive by the adhesive application device 14.
[0057] The slide cam 72 is positioned within a space 132a provided inside the die set 132 of the upper mold 130. The space 132a is formed by the upper part 132b of the die set, columnar portions 132c extending downward from both sides in the width direction of the upper part 132b of the die set, and the lower part 132d of the die set connected to the lower part of the columnar portions 132c. The columnar portions 132c and the lower part 132d of the die set are fixed to the upper part 132b of the die set.
[0058] The drive unit 70 further includes a first biasing member 75 provided between one end of the first cam member 721 and the column portion 132c. The first biasing member 75 is stretched when the first cam member 721 is slid to the left in the figure by the actuator 71, as shown in Figure 8(b). The first biasing member 75 is restored when the pulling of the first cam member 721 by the actuator 71 is released. The restoration of the first biasing member 75 causes the first cam member 721 to slide to the right in the figure.
[0059] The drive unit 70 further includes a second biasing body 76 provided between the lower surface of the second cam member 722 and the upper surface of the lower die set 132d. The second biasing body 76 is compressed when the second cam member 722 is displaced downward, as shown in Figure 8(b). The second biasing body 76 biases the second cam member 722 upward when the first cam member 721 is slid to the right in the figure, as shown in Figure 2(a). The first biasing body 75 and the second biasing body 76 may be made of, for example, a spring, an air cylinder, or rubber.
[0060] The operating pin 73 is positioned above the outer side of the steel plate 2 in the width direction W of the steel plate 2. The upper part 14a of the adhesive application device 14 is wider than the width of the steel plate 2, and the operating pin 73 can abut against the upper part 14a of the adhesive application device 14 on the outer side of the steel plate 2 in the width direction W of the steel plate 2. The width of the upper part 14a of the adhesive application device 14 may be less than or equal to the width of the steel plate 2, and a separate member wider than the width of the steel plate 2 may be attached to the upper part 14a of the adhesive application device 14.
[0061] The number of operating pins 73 is arbitrary. Even if only one operating pin 73 is provided, the adhesive application device 14 can be moved away from the steel plate 2 by the descent of the operating pin 73. However, from the viewpoint of more reliably moving the adhesive application device 14 away from the steel plate 2, it is preferable to provide multiple operating pins 73. Figure 9 shows an example configuration in which four operating pins 73 are provided. It is preferable that the multiple operating pins 73 are arranged at equal intervals in the circumferential direction of the adhesive application device 14.
[0062] The manufacturing apparatus 1 of this embodiment is provided with an insertion hole 800 through which an operating pin 73 is inserted, and further includes a guide member 80 that guides the vertical movement of the operating pin 73. In this embodiment, the insertion hole 800 is provided in the lower part 132d of the die set of the upper mold 130 and in the plate retainer 133 which is vertically movable attached to the die set 132 of the upper mold 130, and the guide member 80 is formed by these lower part 132d of the die set and the plate retainer 133. By providing the guide member 80, the wobble of the operating pin 73 during vertical movement can be suppressed, and the adhesive application apparatus 14 can be stably moved away from the steel plate 2.
[0063] The gap between the inner edge of the insertion hole 800 and the outer edge of the operating pin 73 is preferably 5 μm to 50 μm. A gap of 5 μm or more can suppress wear of the operating pin 73 due to contact between the operating pin 73 and the guide member 80 during vertical movement. A gap of 50 μm or less can more reliably suppress the wobble of the operating pin 73 during vertical movement.
[0064] Preferably, the amount of protrusion of the operating pin 73 from the lower surface of the guide member 80 when the operating pin 73 is at its top dead center is 5 mm or less. The top dead center of the operating pin 73 is the position furthest from the adhesive application device 14 within the range of vertical movement of the operating pin 73 by the first cam member 721 and the second cam member 722. By limiting the amount of protrusion of the operating pin 73 to 5 mm or less, the wobble of the operating pin 73 during vertical movement can be more reliably suppressed. In this embodiment, the lower surface of the plate retainer 133 constitutes the lower surface of the guide member 80. The amount of protrusion of the operating pin 73 from the lower surface of the guide member 80 may be the amount of protrusion of the operating pin 73 from the lower surface of the plate retainer 133 when the operating pin 73 is in its uppermost position and the plate retainer 133 is furthest from the die set 132.
[0065] The manufacturing apparatus 1 of this embodiment includes a buffer member 82 that allows displacement of the adhesive application apparatus 14 in directions toward and toward the steel plate 2. The buffer member 82 biases the adhesive application apparatus 14 toward the steel plate 2. The drive unit 70 overcomes the biasing force of the buffer member 82 and displaces the adhesive application apparatus 14 toward away from the steel plate 2. The adhesive application apparatus 14 returns to the position for applying adhesive due to the biasing force of the buffer member 82.
[0066] The lower mold 131 is provided with a positioning projection 131a that abuts against the upper surface of the adhesive application device 14 when the adhesive application device 14 is brought close to the steel plate 2, determining the position of the adhesive application device 14 in the height direction D2. At the upper limit position of the adhesive application device 14 where the positioning projection 131a abuts against the upper surface of the adhesive application device 14, there is room for shrinkage in the cushioning member 82, and when the adhesive application device 14 receives input from above, the cushioning member 82 allows the adhesive application device 14 to move downward.
[0067] Next, Figure 10 is an explanatory diagram showing a first modified example of the guide member 80 of Figure 8. As shown in Figure 10, the plate holder 133 may be omitted above the adhesive application device 14, and the guide member 80 may be constructed using only the upper mold 130 or its die set lower part 132d. In this case, it is conceivable to make the die set lower part 132d thicker in order to keep the amount of protrusion of the operating pin 73 from the lower surface of the guide member 80 below a predetermined value. Note that in Figure 10 (and the following Figures 11, 12, and 14), the guide member 80 is shown moved upward relative to the operating pin 73 for clarity.
[0068] Next, Figure 11 is an explanatory diagram showing a second modified example of the guide member 80 of Figure 8. When the guide member 80 is composed only of the die set lower part 132d, the die set lower part 132d may be divided into a first die set lower part 132d1 and a second die set lower part 132d2, which are arranged vertically apart from each other. In order to keep the amount of protrusion of the operating pin 73 from the lower surface of the guide member 80 below a predetermined value, the distance between the first die set lower part 132d1 and the second die set lower part 132d2 may be widened. Compared to the first modified example shown in Figure 10, the weight increase of the die set lower part 132d can be suppressed. The second die set lower part 132d2 is fixed to the column part 132c. In this respect, the second die set lower part 132d2 is different from the plate retainer 133 which is attached to the die set 132 so as to be vertically movable.
[0069] Next, Figure 12 is an explanatory diagram showing a third modified example of the guide member 80 of Figure 8, and Figure 13 is a perspective view showing the guide member 80 and base 84 of Figure 12. In the third modified example shown in Figures 12 and 13, the operating pin 73 is attached to the base 84, and the base 84 is connected to the second cam member 722. The base 84 is a member having a width greater than the diameter of the operating pin 73. In this embodiment, the base 84 is inserted through the insertion hole 800 of the guide member 80, and the guide member 80 may guide the vertical movement of the base 84. Multiple operating pins 73 may be attached together to the base 84, and only one insertion hole 800 may be provided in the guide member 80.
[0070] Next, Figure 14 is an explanatory diagram showing a fourth modified example of the guide member 80 of Figure 6, and Figure 15 is a perspective view showing the guide member 80 and base 84 of Figure 14. The base 84 may have a base body 840 positioned below the guide member 80 and a base shaft 841 extending upward from the base body 840. The base body 840 is a member with a width greater than the diameter of the operating pin 73, and the base shaft 841 is a member with a width smaller than the base body 840. The base shaft 841 is inserted through the insertion hole 800 of the guide member 80, and the guide member 80 may guide the vertical movement of the base shaft 841. Compared to the third modified example shown in Figures 12 and 13, this embodiment can reduce the weight of the base 84 and reduce the area of the insertion hole 800.
[0071] Next, Figure 16 is an explanatory diagram showing an example of the connection between the operating pin 73 and the second cam member 722 in Figure 8. The operating pin 73 may be connected to the second cam member 722 by any method, but it may be connected to the second cam member 722 in the manner shown in Figure 16. In the manner shown in Figure 16, the operating pin 73 is connected to the second cam member 722 by a support member 86. The support member 86 includes a cylindrical peripheral wall portion 861 with threads on its inner circumferential surface, a bottom portion 862 provided at one end of the peripheral wall portion 861, and a bottom insertion hole 863 provided in the bottom portion 862. The operating pin 73 includes a head portion 730 and a shaft portion 731. The head portion 730 is a larger diameter portion than the shaft portion 731 and is housed in the internal space of the support member 86 formed by the peripheral wall portion 861 and the bottom portion 862. The shaft portion 731 is a rod-shaped part extending from one end of the head portion 730 and extends to the outside of the support member 86 through the bottom insertion hole 863. A projection 722a with threads on its outer circumference is provided on the lower surface of the second cam member 722. The operating pin 73 is connected to the second cam member 722 via the support member 86 by screwing the threads on the outer circumference of the projection 722a into the threads on the inner circumference of the peripheral wall portion 861. The length of the peripheral wall portion 861 in the vertical direction is longer than the length of the head portion 730 in the same direction, allowing the head portion 730 to move up and down inside the peripheral wall portion 861.
[0072] In this case, when multiple operating pins 73 are provided as shown in the diagram, if the lengths of these operating pins 73 are different, only some of the operating pins 73 may be strongly pressed against the adhesive application device 14, which could lead to instability in pushing down the adhesive application device 14 (moving the adhesive application device 14 away from the steel plate 2).
[0073] The manufacturing apparatus 1 of this embodiment further includes an absorbent member 88 for absorbing the difference in length of the multiple operating pins 73 in the vertical direction. In the embodiment shown in Figure 16, the absorbent member 88 is composed of a support member 86 that supports the operating pins 73 so as to be vertically movable, and a shim 880 provided inside the support member 86. In Figure 10(a), the operating pin 73 on the right is shorter than the operating pin 73 on the left. By providing more or thicker shims 880 inside the right support member 86 compared to the inside of the left support member 86, the contact of the left and right operating pins 73 with the adhesive application apparatus 14 can be made more uniform.
[0074] Next, Figure 17 is an explanatory diagram showing a modified example of the absorbing member 88 of Figure 16. The absorbing member 88 may consist of a support member 86 that supports the operating pin 73 so as to be vertically movable, and an elastic body 881 provided inside the support member 86. In Figure 17(a), the left operating pin 73 is longer than the right operating pin 73. By compressing the elastic body 881 inside the left support member 86 more than the elastic body 881 inside the right support member 86, the contact of the left and right operating pins 73 with the adhesive application device 14 can be made more uniform. For example, a spring or rubber can be used as the elastic body 881. By adjusting the hardness of the elastic body 881, the contact of the operating pins 73 can be adjusted.
[0075] In Figures 16 and 17, a shim 880 or elastic body 881 is provided between the projection 722a of the second cam member 722 and the head 730 of the operating pin 73. However, a shim 880 or elastic body 881 may also be provided between the head 730 of the operating pin 73 and the bottom 862 of the support member 86. These shims 880 and elastic bodies 881 may also be used in combination.
[0076] A method for manufacturing a laminated core 4 according to an embodiment of the present invention includes manufacturing the laminated core 4 using the laminated core 4 manufacturing apparatus 1 described in Embodiments 1 to 3.
[0077] In other words, the method for manufacturing a laminated core 4 according to an embodiment of the present invention is a method for manufacturing a laminated core 4 by punching out a core plate 3 from a steel plate 2 and using the core plate 3, and includes the steps of applying adhesive to the portion of the steel plate 2 corresponding to the core plate 3 using an adhesive application device 14, and punching out the core plate 3 from the steel plate 2 using a mold 15 including an upper mold 130 and a lower mold 131 after the adhesive has been applied by the adhesive application device 14, wherein the lower mold 131 is attached to a lower mold base 1310, and the lower mold base 1310 is provided with a movable part 20 that is movable in the horizontal direction H, and the adhesive application device 14 is provided that is movable integrally with the movable part 20 and is configured to be pullable out from the lower mold 131 in the horizontal direction H. The rest is as described above.
[0078] Although preferred embodiments of the present invention have been described in detail above with reference to the attached drawings, the present invention is not limited to these examples. It is clear to any person with ordinary skill in the art to which the present invention belongs that various modifications or alterations can be conceived within the scope of the technical idea described in the claims, and these are also understood to fall within the technical scope of the present invention.
[0079] The invention described herein may also be described as follows: [1] A laminated core manufacturing apparatus for punching out an iron core plate from a steel plate and manufacturing a laminated core using the iron core plate, comprising: an adhesive application device for applying adhesive to a portion of the steel plate corresponding to the iron core plate; a mold comprising a mold including an upper mold and a lower mold, for punching out the iron core plate from the steel plate after the adhesive has been applied by the adhesive application device, the lower mold being attached to a lower mold base, the lower mold base being provided with a movable part that is movable in the horizontal direction, the adhesive application device being provided to be movable integrally with the movable part and configured to be pullable out horizontally from the lower mold, the lower mold including a lower mold pre-processing section for punching out portions of the steel plate other than the outer shape of the iron core plate, and a lower mold outer shape punching section located downstream of the lower mold pre-processing section in the feeding direction of the steel plate, for punching out the outer shape of the iron core plate from the steel plate, the movable part being located between the lower mold pre-processing section and the lower mold outer shape punching section [2] A laminated core manufacturing apparatus, wherein the movable part includes a bottom wall and a pair of side walls extending upward from both sides of the bottom wall, the adhesive application device is housed in the internal space of the movable part partitioned by the bottom wall and the pair of side walls, and the pair of side walls are provided in contact with the side surface of the lower die pre-processing section and the side surface of the lower die outer shape punching section. [3] A laminated core manufacturing apparatus, wherein the movable part is further provided with a guide rail on the lower die base, and the horizontal movement of the movable part is guided by the guide rail. [4] A laminated core manufacturing apparatus, wherein the guide rail is a step formed on the lower die base. [5] The apparatus for manufacturing laminated iron cores according to any one of the first to fourth paragraphs, further comprising a stopper for determining the position of the movable part and the adhesive application device in the horizontal direction when applying adhesive to the portion of the steel plate corresponding to the iron core plate.[6] A laminated core manufacturing apparatus according to any one of the first to fifth paragraphs, further comprising a drive device for displacing the adhesive application device relative to the steel plate to switch whether or not to apply the adhesive, wherein the drive device is provided on the upper mold so as to face the adhesive application device. [7] A laminated core manufacturing apparatus according to any one of the first to sixth paragraphs, further comprising a drive device for displacing the adhesive application device relative to the steel plate to switch whether or not to apply the adhesive, wherein the drive device is provided so as to be movable together with the movable part with respect to the adhesive application device. [8] A method for manufacturing a laminated core, comprising manufacturing the laminated core using the laminated core manufacturing apparatus according to any one of the first to seventh paragraphs.
[0080] 1: Manufacturing equipment 2: Steel plate 3: Iron core plate 4: Laminated iron core 14: Adhesive application device 15: Mold 20: Movable part 30: Stopper 40: Drive device 60: Guide rail 70: Drive device 130: Upper mold 131: Lower mold 1310: Lower mold base 1311: Lower mold pre-processing section 1312: Lower mold outer shape punching section
Claims
1. A laminated core manufacturing apparatus for punching out core plates from a steel plate and manufacturing a laminated core using the core plates, comprising: an adhesive application apparatus for applying adhesive to the portion of the steel plate corresponding to the core plate; a die including an upper die and a lower die for punching out the core plate from the steel plate after the adhesive has been applied by the adhesive application apparatus, wherein the lower die is mounted on a lower die base, the lower die base is provided with a movable part that is movable in the horizontal direction, the adhesive application apparatus is provided to be movable integrally with the movable part and is configured to be pulled out horizontally from the lower die, the lower die includes a lower die pre-processing section for punching out portions of the steel plate other than the outer shape of the core plate, and a lower die outer shape punching section located downstream of the lower die pre-processing section in the feeding direction of the steel plate and for punching out the outer shape of the core plate from the steel plate, the movable part is located between the lower die pre-processing section and the lower die outer shape punching section. A manufacturing apparatus for laminated iron cores, wherein the movable part includes a bottom wall and a pair of side walls extending upward from both sides of the bottom wall, the adhesive application device is housed in the internal space of the movable part which is partitioned by the bottom wall and the pair of side walls, and the pair of side walls are provided in contact with the side surface of the lower die pre-processing section and the side surface of the lower die outer shape punching section.
2. The apparatus for manufacturing laminated iron cores according to claim 1, wherein the outer surfaces of the pair of side walls slide on the side surface of the lower die pre-processing section and the side surface of the lower die outer shape punching section, thereby guiding the movement of the movable part.
3. The apparatus for manufacturing laminated iron cores according to claim 1, further comprising a guide rail provided on the lower mold base, wherein the horizontal movement of the movable part is guided by the guide rail.
4. The apparatus for manufacturing laminated iron cores according to claim 3, wherein the guide rail is a step formed in the lower mold base.
5. The apparatus for manufacturing laminated iron cores according to claim 1, further comprising a stopper that determines the position of the movable part and the adhesive application device in the horizontal direction when applying adhesive to the portion of the steel plate corresponding to the iron core plate.
6. The apparatus for manufacturing a laminated iron core according to claim 1, further comprising a drive device for displacing the adhesive application device relative to the steel plate to switch whether or not to apply the adhesive, wherein the drive device is provided on the upper mold so as to face the adhesive application device.
7. The apparatus for manufacturing laminated iron cores according to claim 1, further comprising a drive device for displacing the adhesive application device relative to the steel plate to switch whether or not to apply the adhesive, wherein the drive device is provided to be movable together with the movable part.
8. A method for manufacturing a laminated iron core, comprising manufacturing the laminated iron core using a laminated iron core manufacturing apparatus described in any one of claims 1 to 7.