Laminated iron core manufacturing apparatus and manufacturing method
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Filing Date
- 2024-11-15
- Publication Date
- 2025-05-22
Abstract
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 applies 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 response to the increasing demand for rotating electrical machines, there is a demand for an increase in the punching speed of the iron core thin plates. 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, but as the punching speed increases, it becomes more difficult to switch the adhesive application process, and it becomes more difficult to separate the laminated iron core from the group of iron core thin plates.
[0006] The present invention has been made to solve the above-mentioned problems, and one of its objects is to provide a laminated core manufacturing apparatus and manufacturing method that can more reliably separate the laminated core from a group of core thin plates and increase the punching speed of the core thin plates.
[0007] In one embodiment, the laminated core manufacturing apparatus of the present invention is a laminated core manufacturing apparatus for punching out iron core sheets of a predetermined shape from a steel plate and manufacturing a laminated core in which a predetermined number of iron core sheets are stacked and bonded together, and is equipped with a punching section for punching the iron core sheets from the steel plate, an adhesive application section for applying adhesive to the portions of the steel plate corresponding to the iron core sheets, a stacking section for stacking and bonding the iron core sheets with the adhesive applied to form an iron core sheet group, and a separation section that penetrates between adjacent iron core sheets in the iron core sheet group and separates the laminated core from the iron core sheet group, and the stacking section has multiple pairs of lateral pressure applying sections that apply lateral pressure to the iron core sheet group, and each pair of lateral pressure applying sections is arranged to face each other with the iron core sheet group between them, and at least one of the lateral pressure applying sections also functions as a separation section.
[0008] 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.
[0009] According to one embodiment of the laminated iron core manufacturing apparatus and manufacturing method of the present invention, the separation portion penetrates between adjacent iron core thin plates within the iron core thin plate group, separating the laminated iron core, which has a predetermined number of iron core thin plates stacked and bonded together, from the iron core thin plate group, thereby making it possible to more reliably separate the laminated iron core from the iron core thin plate group and increase the punching speed of the iron core thin plates.
[0010] FIG. 1 is an explanatory diagram showing a laminated core manufacturing apparatus according to a first embodiment of the present invention. FIG. 2 is an explanatory diagram showing the lamination section of FIG. 1 in more detail. FIG. 3 is a plan view showing the core thin plate group and lateral pressure applying section of FIG. 2. FIG. 4 is an explanatory diagram showing the operation of the lateral pressure applying section of FIG. 2. FIG. 5 is an explanatory diagram showing a first modified example of the lateral pressure applying section of FIG. 4. FIG. 6 is an explanatory diagram showing a second modified example of the lateral pressure applying section of FIG. 4. FIG. 7 is an explanatory diagram showing a third modified example of the lateral pressure applying section of FIG. 4. FIG. 8 is a cross-sectional view of the core thin plates of FIG. 2. FIG. 10 is an enlarged view showing an adhesive application section 6 of FIG. 1. FIG. 11 is an explanatory diagram showing the lamination section of a laminated core manufacturing apparatus according to a second embodiment of the present invention.
[0011] 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.
[0012] Embodiment 1. Figure 1 is an explanatory diagram showing a manufacturing apparatus 1 for a laminated core 4 according to embodiment 1 of the present invention. 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.
[0013] As shown in Figure 1, the manufacturing apparatus 1 of this embodiment may have a reel 10, a feeding device 11, an oiling device 12, and press equipment 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 equipment 13 via the feeding device 11. The oiling device 12 is disposed between the feeding device 11 and the press equipment 13, and supplies press oil to the surface of the steel sheet 2 before the steel sheet 2 is introduced into the press equipment 13. The press equipment 13 has an upper die 13a and a lower die 13b, and the upper die 13a and the lower die 13b punch out the iron core thin plate 3 from the steel sheet 2.
[0014] The manufacturing apparatus 1 of this embodiment has a punching section 5 , an adhesive application section 6 , a laminating section 7 and a separating section 8 .
[0015] The punching section 5 is a section for punching out the iron core thin plates 3 from the steel plate 2. The punching section 5 may be composed of an upper die 13a and a lower die 13b.
[0016] The punching of the steel plate 2 by the punching unit 5 may be carried out in multiple steps. That is, the steel plate 2 may be punched sequentially in the feed direction D1 of the steel plate 2 toward the final core thin plate 3. The punching of the steel plate 2 by the punching unit 5 may include pre-processing, in which portions other than the outer shape or outer periphery of the core thin plate 3 are punched out of the steel plate 2 in one or multiple steps, and outline punching, in which the outer shape of the core thin plate 3 is punched out of the steel plate 2 after the pre-processing. Outer shape punching is carried out last, and the core thin plate 3 is punched out of the steel plate 2 when the outer shape of the core thin plate 3 has been punched out.
[0017] The adhesive application section 6 is a section for applying adhesive to the portion of the steel sheet 2 corresponding to the iron core thin plate 3. The adhesive application section 6 may be built into the lower mold 13b, and may apply adhesive to the lower surface of the steel sheet 2. The adhesive may be applied before the iron core thin plate 3 is finally punched out from the steel sheet 2, that is, when pre-processing is performed or before outline punching. However, the timing of adhesive application is arbitrary, and adhesive application may also be performed at other times, such as before the steel sheet 2 is introduced into the press equipment 13.
[0018] The lamination section 7 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 7 may be built into the lower mold 13b at a position where the punching section 5 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 that iron core thin plate 3 itself or the weight of subsequent iron core thin plates 3 and the pressure of the upper mold 13a. The upper mold 13a 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] The separating portion 8 is a portion that bites into the gap between adjacent core thin plates 3 in the core thin plate group 30 and separates the laminated core 4 from the core thin plate group 30. The separating portion 8 may be built into the lower mold 13b so as to be located below or below the laminated portion 7. Separation of the laminated core 4 by the separating portion 8 is performed once every time a plurality of core thin plates 3, for example, 200 sheets, are punched out. In other words, the frequency with which the laminated core 4 is separated is less than the frequency with which the core thin plates 3 are punched out.
[0020] In the prior art, adhesive is not applied to one of the predetermined number of core thin plates 3, and the core thin plate group 30 is separated at the core thin plate 3 not coated with adhesive. However, when punching the core thin plates 3 at a high punching speed, such as 100 spm or more, it becomes difficult to switch the application of adhesive, making it difficult to separate the laminated core 4 from the core thin plate group 30. For this reason, the prior art had a limit on the punching speed of the core thin plates 3. In the manufacturing apparatus 1 of this embodiment, the separating portion 8 penetrates between adjacent core thin plates 3 in the core thin plate group 30, separating the laminated core 4, in which a predetermined number of core thin plates 3 are stacked and bonded, from the core thin plate group 30. This allows the laminated core 4 to be more reliably separated from the core thin plate group 30, and the punching speed of the core thin plates 3 can be increased. In the manufacturing apparatus 1 of this embodiment, the adhesive application unit 6 does not need to switch whether or not to apply adhesive, and can apply adhesive to the areas corresponding to all of the iron core thin plates 3.
[0021] The manufacturing apparatus 1 may have a conveying device 9 for conveying the laminated core 4 separated from the core thin plate group 30 by the separating unit 8. The laminated core 4 may be removed from the lower mold 13b by the conveying device 9.
[0022] Next, FIG. 2 is an explanatory diagram showing the stacking unit 7 of FIG. 1 in more detail, FIG. 3 is a plan view showing the iron core thin plate group 30 and the lateral pressure applying unit 71 of FIG. 2, and FIG. 4 is an explanatory diagram showing the operation of the lateral pressure applying unit 71 of FIG. 2.
[0023] 2 and 3, the laminated portion 7 may have a squeeze portion 70 and a plurality of pairs of lateral pressure applying portions 71. Each of (a) and (b) of Figure 3 shows an embodiment in which the laminated portion 7 has two pairs of lateral pressure applying portions 71.
[0024] The squeeze section 70 is for forming an internal space 70a whose width narrows from top to bottom. The squeeze section 70 may be disposed above the stacking section 7. The inner surface 70b of the squeeze section 70 guides the core thin plates 3 and applies lateral pressure to the core thin plates 3, thereby adjusting the positions of the core thin plates 3 stacked in the core thin plate group 30 as they move downward.
[0025] The multiple pairs of lateral pressure applying portions 71 are intended to apply lateral pressure to the core thin plate group 30. The multiple pairs of lateral pressure applying portions 71 may be arranged below the stacking portion 7. The multiple pairs of lateral pressure applying portions 71 may be provided separately from the squeeze portion 70 below the squeeze portion 70. The multiple pairs of lateral pressure applying portions 71 apply lateral pressure to the core thin plate group 30, thereby holding the core thin plate group 30. From this perspective, the lateral pressure applying portions 71 may also be referred to as holding portions or brakes. As shown in FIGS. 3A and 3B, the pairs of lateral pressure applying portions 71 may be arranged to face each other with the core thin plate group 30 sandwiched therebetween. The pairs of lateral pressure applying portions 71 may be arranged spaced apart from each other in the circumferential direction of the core thin plate group 30 so as to press against any side of the core thin plate group 30.
[0026] When viewed in plan as shown in FIGS. 3A and 3B , the core thin plate group 30 may have four first side surfaces 30 a (side surfaces extending vertically and horizontally in the figure) and four second side surfaces 30 b located at the four corners. Two first side surfaces 30 a adjacent to each other in the circumferential direction of the core thin plate group 30 extend in directions perpendicular to each other. Each second side surface 30 b extends at an angle relative to the direction in which the two first side surfaces 30 a extend, connecting the two first side surfaces 30 a. FIG. 3A shows a state in which the lateral pressure applying portion 71 is pressed against the four first side surfaces 30 a extending vertically and horizontally in the figure. The lateral pressure applying portion 71 may be pressed against the center of the vertical and horizontal first side surfaces 30 a. FIG. 3B shows a state in which the lateral pressure applying portion 71 is pressed against the four second side surfaces 30 b located at the four corners. 3, the extension width of the second side surfaces 30b at the four corners is shorter than the extension width of the first side surfaces 30a at the top, bottom, left, and right, and the side pressure applying portions 71 may be pressed against most (50% or more) of the area of the second side surfaces 30b at the four corners. Arrows 9a in (a) and (b) of Figures 3A and 3B indicate the direction in which the laminated core 4 is transported by the transport device 9.
[0027] In the manufacturing apparatus 1 of this embodiment, at least one of the lateral pressure applying units 71 also serves as the separating unit 8. By having at least one of the lateral pressure applying units 71 also serve as the separating unit 8, the number of parts of the manufacturing apparatus 1 can be reduced.
[0028] In this embodiment, four lateral pressure applying portions 71 are arranged at 90-degree intervals in the circumferential direction of the core thin plate group 30. All four lateral pressure applying portions 71 may double as separators 8, or three or fewer lateral pressure applying portions 71 may double as separators 8. Furthermore, at least one pair of the multiple pairs of lateral pressure applying portions 71 may double as separators 8. In this case, the separators 8 (lateral pressure applying portions 71) may bite into the core thin plates 3 from both sides of the core thin plate group 30. Alternatively, one of each pair of lateral pressure applying portions 71 may double as separator 8. In this case, the separators 8 (lateral pressure applying portions 71) may bite into the core thin plates 3 from two mutually perpendicular directions.
[0029] Each of the pairs of side pressure applying portions 71 may include a brake block 710 that is pressed against a side surface of the core thin plate group 30. The brake block 710 may be configured to be tilted when separating the laminated core 4 from the core thin plate group 30, so that upper or lower corners 710a, 710b in the height direction D2 of the core thin plate group 30 bite into the core thin plates 3. As particularly shown in FIG. 4 , the brake block 710 of this embodiment is configured so that the upper corner 710a bites into the core thin plates 3, and the lower corner 710b is tilted so as to move away from the core thin plate group 30.
[0030] The brake block 710 may have any shape, but the brake block 710 in this embodiment has an overall rectangular parallelepiped shape. The brake block 710 may have a front surface 710c, an upper surface 710d, and a lower surface 710e. The front surface 710c is a surface that is pressed against the side surface of the core thin plate group 30 and may be a flat surface along the side surface of the core thin plate group 30. The upper surface 710d is a surface that extends from the upper end of the front surface 710c in the front-rear direction D3 of the brake block 710, and the lower surface 710e is a surface that extends from the lower end of the front surface 710c in the front-rear direction D3 of the brake block 710. The upper surface 710d and the lower surface 710e may be flat surfaces that are perpendicular to the front surface 710c. The upper surface 710d and the lower surface 710e may extend parallel to and spaced from each other in the height direction D2 of the core thin plate group 30.
[0031] The upper corner 710a is where the front surface 710c meets the upper surface 710d, and the lower corner 710b is where the front surface 710c meets the lower surface 710e. In the illustrated brake block 710, when the brake block 710 is viewed along the width direction D4 of the brake block 710, the upper and lower corners 710a and 710b form a right angle. The width direction D4 is a direction perpendicular to the front-rear direction D3 and the height direction D2 of the core thin plate group 30. The height direction D2 of the core thin plate group 30 is synonymous with the height direction of the brake block 710.
[0032] A more detailed description will be given of the lateral pressure applying unit 71. The lateral pressure applying unit 71 of this embodiment further includes a base block 711, a pair of support arms 712, a tilting shaft 713, a biasing means 714, and a driving means 715.
[0033] The base block 711 is disposed behind the brake block 710 in the front-rear direction D3 of the brake block 710. In other words, the brake block 710 is disposed between the side surface of the core thin plate group 30 and the base block 711.
[0034] The pair of support arms 712 extend forward from the base block 711 at a distance from each other in the width direction D4 (see FIG. 3). The pair of support arms 712 may extend parallel to each other. The brake block 710 is disposed between the pair of support arms 712 in front of the base block 711.
[0035] The tilting shaft 713 is attached to the tip of the pair of support arms 712 so as to extend in the width direction D4. The brake block 710 is supported by the tilting shaft 713 so as to be tiltable. As particularly shown in FIG. 4 , the brake block 710 has an insertion hole 710 f through which the tilting shaft 713 is inserted. The insertion hole 710 f may be an elongated hole extending long in the front-rear direction D3 so as to allow relative displacement of the brake block 710 with respect to the base block 711 in the front-rear direction D3.
[0036] The biasing means 714 is configured, for example, by a coil spring or the like, and is disposed between the base block 711 and the brake block 710 to bias the brake block 710 in the front-to-rear direction D3. The biasing of the brake block 710 by the biasing means 714 applies lateral pressure to the iron core thin plate group 30. Additionally or alternatively, the entire lateral pressure applying portion 71 may be driven in the front-to-rear direction D3 by a driving means (not shown), thereby applying lateral pressure to the iron core thin plate group 30. The driving means can bias the base block 711. When the lateral pressure applying portion 71 is driven by the driving means, the biasing means 714 may be omitted.
[0037] The insertion hole 710f of the brake block 710 is disposed forward of the center position of the brake block 710 in the front-rear direction D3. As shown in Figure 4, when the driving means 715 pushes up the rear of the brake block 710, the upper corners 710a of the brake block 710 wedges between the iron core thin plates 3, thereby separating the laminated core 4 from the iron core thin plate group 30. Alternatively, by configuring the driving means 715 to push down the rear of the brake block 710, the lower corners 710b can be wedged between the iron core thin plates 3. The driving means 715 can be any configuration, such as a hydraulic plunger, a solenoid plunger, or a stepping motor.
[0038] The insertion hole 710f is positioned above the center position of the brake block 710 in the height direction D2 of the core thin plate group 30. That is, the brake block 710 of this embodiment is tiltably supported by a tilting shaft 713 located above the center position of the brake block 710 in the height direction D2 of the core thin plate group 30. By positioning the tilting shaft 713 above the center position, the force with which the upper corner 710a bites into the core thin plates 3 can be increased by the principle of leverage.
[0039] Next, Fig. 5 is an explanatory diagram showing a first modified example of the lateral pressure applying portion 71 of Fig. 4, and Fig. 6 is an explanatory diagram showing a second modified example of the lateral pressure applying portion 71 of Fig. 4. In the embodiment of Fig. 4, the rear portion of the brake block 710 is pushed up to wedge the upper corners 710a between the iron core thin plates 3. However, the manner in which the brake block 710 is tilted can be changed as desired.
[0040] The first modified example shown in FIG. 5 is an example of a slide cam type in which the brake block 710 is tilted by a slide cam 72. The slide cam 72 includes a first slide cam 721 and a second slide cam 722, each having a plurality of cams 721a, 722a. The first slide cam 721 is disposed below the rear of the brake block 710 and is fixed to the brake block 710. The second slide cam 722 is disposed so that its cam 722a meshes with the cam 721a of the first slide cam 721. When the second slide cam 722 is displaced to the right in the figure, the cam 721a of the first slide cam 721 rides on the cam 722a of the second slide cam 722. This pushes the rear of the brake block 710 upward, tilting the brake block 710 about the tilting shaft 713, and allowing the upper corners 710a of the brake block 710 to wedge between the iron core thin plates 3.
[0041] 6 is an example of a seesaw type brake block 710 that tilts around a tilting shaft 713 disposed rearward of the brake block 710. The tilting shaft 713 is provided on an arm 73 that extends rearward from the brake block 710. By pushing up the rear portion of the arm 73 (the portion farther from the brake block 710 than the tilting shaft 713), the upper corner 710a can be wedged between the iron core thin plates 3.
[0042] Next, FIG. 7 is an explanatory diagram showing a third modification of the lateral pressure applying portion 71 of FIG. 4 . The upper corner 710a, which is wedged between the iron core thin plates 3, may form an acute angle when the brake block 710 is viewed along the width direction D4 of the brake block 710. As shown in FIG. 7 , the upper corner 710a can be made acute-angled by providing a recess 710g at the top of the front surface 710c. The recess 710g is provided adjacent to the upper end of the front surface 710c. The extension width of the recess 710g in the height direction D2 is preferably 50% or less, more preferably 25% or less, and even more preferably 10% or less, of the extension width of the front surface 710c in the height direction D2. In an embodiment in which the lower corner 710b is wedged between the iron core thin plates 3, the lower corner 710b may be acute-angled.
[0043] Next, Figure 8 is a cross-sectional view of the iron core thin plate 3 in Figure 2. As described above, the iron core thin plate 3 is punched out from the steel plate 2. At the end of the iron core thin plate 3, a sag 31 is formed on the upper surface side, and a burr 32 is formed on the lower surface side. The sag 31 is a portion of the surface of the steel plate 2 that is deformed when a tensile force acts on the surface of the steel plate 2 when the cutting edge of the upper die 13a is pressed into the surface of the steel plate 2. The burr 32 is a portion of the steel plate 2 that is stretched or torn off when the cutting edge of the upper die 13a leaves the steel plate 2. The burr 32 is also called a burr.
[0044] When the thin core plates 3 are stacked, the burrs 32 of the upper thin core plate 3 may cover the sags 31 of the lower thin core plate 3, reducing the gap between the upper and lower thin core plates 3.
[0045] The punching unit 5 may change the shape of the end of the core thin plate 3 at the position where the laminated core 4 is separated from the core thin plate group 30. More specifically, the punching unit 5 makes the height of the burrs 32 of the core thin plate 3 at the position where the laminated core 4 is separated from the core thin plate group 30 lower than the height of the burrs 32 of the other core thin plates 3. In other words, the core thin plates 3 include a bottom thin plate 3a (see FIG. 8) that forms the bottom surface of the core thin plate group 30 after the laminated core 4 is separated from the core thin plate group 30, and a laminate thin plate 3b (see FIG. 8) that is laminated on top of the bottom thin plate 3a, and the punching unit 5 may be configured to punch out the bottom thin plate 3a so that the height of the burrs 32 formed at the bottom of the bottom thin plate 3a is smaller than the height of the burrs 32 formed at the bottom of the laminate thin plate 3b. The height of the burr 32 can be adjusted by changing the clearance between the cutting edge of the upper die 13 a and the cutting edge of the lower die 13 b. When punching out the core thin plate 3 (lower surface thin plate 3 a) at the position where the laminated core 4 is separated from the core thin plate group 30, the upper die 13 a and / or the lower die 13 b may be changed so as to reduce the clearance between the cutting edge of the upper die 13 a and the cutting edge of the lower die 13 b.
[0046] For example, the upper die 13a and / or the lower die 13b may be adjustable so as to reduce the burrs 32 at the portions where the brake blocks 710 in FIG. 3 come into contact (the centers of the four first side surfaces 30a (edges) on the outer periphery of the core thin plate group 30 in FIG. 3(a) and the second side surfaces 30b (edges) at the four corners of the outer periphery of the core thin plate group 30 in FIG. 3(b)). In other words, the die blades may be made up of multiple parts, and the clearance of at least some of the parts may be adjustable. When the core thin plate 3 is viewed in plan as in FIG. 3, the die for punching out the outer periphery of the core thin plate 3 can generally be made up of a total of eight parts, including the edges that make up the four first side surfaces 30a on the upper, lower, left, and right sides and the edges that make up the second side surfaces 30b at the four corners. When reducing the burrs 32 at the centers of the four edges on the upper, lower, left, and right sides as described above, the parts that cut the four edges on the upper, lower, left, and right sides can be further divided into three small parts each (a total of 12 small parts). The three small parts can cut the center and both ends of the top, bottom, left, and right sides. The small parts for cutting the center of each side may be adjustable. When the brake block 710 is pressed against the second side surface 30b at the four corners as shown in Figure 3(b), the parts for cutting the sides that make up the second side surface 30b at the four corners may be adjustable.
[0047] Alternatively, the punching unit 5 may punch the core thin plate 3 so that the height of the burr 32 where the brake block 710 is pressed is smaller than the height of the burr 32 at an adjacent position, without varying the clearance. Using the above example as an example, the clearance of the small part for cutting the center of the edge that constitutes the first side surface 30a may be set smaller than the clearance of the small parts for cutting both ends of that edge. When the brake block 710 is pressed against the second side surface 30b at the four corners as shown in FIG. 3( b), the clearance of the part for cutting the edge that constitutes the second side surface 30b at the four corners may be set smaller than the clearance of the part for cutting the top, bottom, left, and right edges.
[0048] Next, Fig. 9 is an enlarged view of the adhesive application unit 6 of Fig. 1. As shown in Fig. 9, the adhesive application unit 6 is provided with a passage 60a through which the adhesive passes, and has a discharge unit 60 configured to discharge the adhesive from the tip of the passage 60a. In the illustrated embodiment, the discharge unit 60 is composed of a plurality of nozzles arranged apart from one another. The adhesive application unit 6 is arranged so that the adhesive discharged from the tip of the discharge unit 60 comes into contact with the steel sheet 2 in accordance with the up and down movement of the steel sheet 2 associated with the punching of the iron core thin sheets 3 from the steel sheet 2.
[0049] In this embodiment, the adhesive is applied to the surface of the steel plate 2 (the surface on the lower side in the figure). A non-adhesive area 300, where no adhesive is applied, is provided on the outer periphery of the surface of the portion corresponding to the iron core thin plate 3. When the iron core thin plate group 30 is formed in the laminated portion 7, the non-adhesive area 300 forms a gap between adjacent iron core thin plates 3 in the iron core thin plate group 30. The separating portion 8 (side pressure applying portion 71) can penetrate between the iron core thin plates 3 through the gap formed by the non-adhesive area 300. The non-adhesive area 300 may be provided at least at the position of the separating portion 8 in the circumferential direction of the portion corresponding to the iron core thin plate 3. The non-adhesive area 300 may also be provided on the outer periphery of the portion corresponding to the iron core thin plate 3 over the entire periphery of the portion corresponding to the iron core thin plate 3.
[0050] Second Embodiment. Figure 10 is an explanatory diagram showing the lamination unit 7 of the manufacturing apparatus 1 for manufacturing a laminated core 4 according to a second embodiment of the present invention. In the first embodiment, the lateral pressure applying unit 71 doubles as the separating unit 8. However, the separating unit 8 may be provided separately from the lateral pressure applying unit 71. In the embodiment shown in Figure 10, the separating unit 8 is composed of multiple wedge-shaped members spaced apart from one another in the circumferential direction of the core thin plate group 30 below the lateral pressure applying unit 71. The separating unit 8 is provided so as to be movable toward and away from the side surface of the core thin plate group 30. By bringing the separating unit 8 closer to the side surface of the core thin plate group 30, the tip 8a of the separating unit 8 may bite into the gap between adjacent core thin plates 3 in the core thin plate group 30, thereby separating the laminated core 4 from the core thin plate group 30. The position of the member constituting the separating unit 8 may be elsewhere, such as above the lateral pressure applying unit 71. The rest of the configuration is the same as in the first embodiment.
[0051] A manufacturing method of a laminated core 4 according to an embodiment of the present invention includes manufacturing a laminated core 4 using the above-described manufacturing apparatus 1 for manufacturing a laminated core 4. The manufacturing method of a laminated core 4 may include the steps of punching out core thin plates 3 from a steel plate 2 using a punching unit 5, applying adhesive to portions of the steel plate 2 corresponding to the core thin plates 3 using an adhesive application unit 6, stacking and bonding the adhesive-coated core thin plates 3 in a stacking unit 7 to form a group of core thin plates 30, and wedging separation portions 8 between adjacent core thin plates 3 in the group of core thin plates 30 to separate a laminated core 4, in which a predetermined number of core thin plates 3 are stacked and bonded, from the group of core thin plates 30.
[0052] 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.
[0053] 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 core sheets of a predetermined shape are punched out of a steel sheet and a predetermined number of the core sheets are stacked and bonded together, the device comprising: a punching unit for punching the core sheets out of the steel sheet, an adhesive application unit for applying adhesive to portions of the steel sheet corresponding to the core sheets, a lamination unit for stacking and bonding the adhesive-coated core sheets to form an iron core sheet group, and a separation unit that bites into spaces between adjacent core sheets in the iron core sheet group to separate the laminated core from the iron core sheet group, the lamination unit having a plurality of pairs of lateral pressure applying units that apply lateral pressure to the iron core sheet group, the lateral pressure applying units of each pair being arranged to face each other with the iron core sheet group in between, and at least one of the lateral pressure applying units also serving as the separation unit. [2] The laminated core manufacturing device according to paragraph 1, wherein each of the pairs of side pressure applying units includes a brake block pressed against a side surface of the core thin plate group, and the brake block is configured to be tilted when separating the laminated core from the core thin plate group so that an upper or lower corner in the height direction of the core thin plate group bites into the between the core thin plates. [3] The laminated core manufacturing device according to paragraph 2, wherein the brake block is configured to be tilted so that the upper corner bites into the between the core thin plates and the lower corner moves away from the core thin plate group. [4] The laminated core manufacturing device according to paragraph 3, wherein the brake block is tiltably supported by a tilting shaft located above a center position of the brake block in the height direction of the core thin plate group. [5] The laminated core manufacturing device according to any one of paragraphs 1 to 4, wherein the punching unit changes the shape of the end of the core thin plate at the position where the laminated core is separated from the core thin plate group.[6] The manufacturing device for a laminated core according to any one of items 1 to 5, wherein the adhesive is applied to the surface of the steel plate, and an uncoated area where the adhesive is not applied is provided on the outer periphery of the surface of the steel plate at a portion corresponding to the iron core thin plate, and when the iron core thin plate group is formed in the laminated section, the uncoated area forms a gap between the iron core thin plates adjacent to each other in the iron core thin plate group, and the separating section bites into the between the iron core thin plates through the gap formed by the uncoated area. [7] A manufacturing method for a laminated core, comprising manufacturing the laminated core using the manufacturing device for a laminated core according to any one of items 1 to 6.
[0054] REFERENCE SIGNS LIST 1: Manufacturing device 2: Steel plate 3: Iron core thin plate 4: Laminated iron core 5: Punching section 6: Adhesive application section 7: Lamination section 8: Separation section 30: Group of iron core thin plates 71: Side pressure application section 710: Brake block 710a: Upper corner 710b: Lower corner 713: Tilting axis
Claims
1. A laminated core manufacturing apparatus for punching out iron core sheets of a predetermined shape from a steel plate and manufacturing a laminated core in which a predetermined number of the iron core sheets are stacked and bonded together, the apparatus comprising: a punching section for punching the iron core sheets from the steel plate; an adhesive application section for applying adhesive to portions of the steel plate corresponding to the iron core sheets; a lamination section for stacking and bonding the iron core sheets with the adhesive applied to them to form a group of iron core sheets; and a separation section that bites into between adjacent iron core sheets in the group of iron core sheets and separates the laminated core from the group of iron core sheets, the lamination section having a plurality of pairs of lateral pressure application sections that apply lateral pressure to the group of iron core sheets, the lateral pressure application sections of each pair being arranged to face each other with the group of iron core sheets in between, and at least one of the lateral pressure application sections also serving as the separation section.
2. A laminated core manufacturing device as described in claim 1, wherein each of the multiple pairs of side pressure applying portions includes a brake block that is pressed against a side of the group of core thin plates, and the brake block is configured to be tilted when separating the laminated core from the group of core thin plates so that an upper or lower corner in the height direction of the group of core thin plates bites into between the core thin plates.
3. The laminated core manufacturing device according to claim 2, wherein the brake block is configured so that the upper corners are wedged between the thin core plates and the lower corners are tilted away from the group of thin core plates.
4. A laminated core manufacturing device as set forth in claim 3, wherein the brake block is tiltably supported by a tilt shaft located above a center position of the brake block in the height direction of the group of core thin plates.
5. The laminated core manufacturing device according to any one of claims 1 to 4, wherein the punching section changes the shape of the end of the core thin plate at a position where the laminated core is separated from the group of core thin plates.
6. A laminated core manufacturing device as claimed in any one of claims 1 to 4, wherein the adhesive is applied to the surface of the steel plate, and a non-applied area where the adhesive is not applied is provided on the outer periphery of the surface of the steel plate in the portion corresponding to the iron core thin plate, and when the iron core thin plate group is formed in the laminated section, the non-applied area forms a gap between the adjacent iron core thin plates in the iron core thin plate group, and the separating section penetrates between the iron core thin plates through the gap formed by the non-applied area.
7. 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 4.