Method and apparatus for manufacturing laminated core

Abstract

To provide a method of manufacturing a laminated core capable of obtaining the laminated core capable of easily and surely suppressing peeling between core pieces even when the number of the core pieces is increased.SOLUTION: Forming a plurality of blocks 9 in which the iron core pieces 7 are laminated while being bonded by the adhesive 25 by sequentially punching the plurality of iron core pieces from the magnetic steel plate 5 having the adhesive by the punch 11 and holding the iron core pieces in the die 13, and avoiding bonding between the adjacent blocks 9 by positioning the adhesive 25 of one block 9 in the groove portion 27 of the other block 9 between the end portions of the adjacent blocks 9; In the adjacent blocks 9, the preceding block 9 pulled out of the die 13 and separated from the succeeding block 9 is supported on the receiving jig 15, and the preceding and succeeding blocks 9 are bonded by the adhesive 25 by shifting the phases of the groove part 27 and the adhesive 25 while laminating the succeeding block 9 pulled out of the die 13 on the preceding block 9.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method and apparatus for manufacturing a laminated core for use in an electric motor or the like. [Background technology]

[0002] A conventional method for manufacturing a laminated core is described in Patent Document 1.

[0003] In this manufacturing method, a plurality of core pieces are sequentially punched into a die from a magnetic steel plate having an adhesive thereon using a punch. The punched core pieces are then stacked and held in the die while being bonded together with the adhesive.

[0004] The core pieces used in this manufacturing method have protrusions formed on their surfaces at intervals of a predetermined number of core pieces, allowing laminated cores to be obtained by separating the core pieces into a predetermined number of pieces, which are then removed from the die.

[0005] In this manufacturing method, if the number of core pieces in the laminated core is large, there is a risk that separation will occur between the core pieces due to its own weight or the like before the laminated core is completely removed from the die, which has resulted in a limit to the number of core pieces that can be included in a laminated core. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-307636 Summary of the Invention [Problem to be solved by the invention]

[0007] The problem to be solved is that there is a risk of separation occurring between the core pieces depending on the number of core pieces in a laminated core, and there is a limit to the number of core pieces. [Means for solving the problem]

[0008] The present invention provides a method for manufacturing a laminated core, in which a punch is used to sequentially punch out a plurality of core pieces from a magnetic steel plate having an adhesive and hold them in a die, thereby forming a plurality of stacked blocks in which the core pieces are adhered with the adhesive, and between the ends of adjacent blocks, the adhesive of one block is located in a groove of the other block to prevent adhesion between the adjacent blocks, and in the adjacent blocks, a preceding block that has come out of the die and separated from a subsequent block is supported on a receiving jig, and the subsequent block that has come out of the die is stacked on the preceding block while shifting the phase of the groove and the adhesive, thereby adhering the preceding and subsequent blocks with the adhesive.

[0009] The present invention also provides a laminated core manufacturing device that includes a punch that punches out core pieces from a magnetic steel plate having an adhesive, a die that sequentially holds multiple core pieces punched out by the punch to form multiple blocks that are stacked while being bonded with the adhesive, and a receiving jig that supports the blocks, wherein between the ends of adjacent blocks in the die, the adhesive of one block is positioned in a groove of the other block to prevent the adjacent blocks from being bonded with the adhesive, and a preceding block that has come out of the die and separated from the subsequent block in the adjacent block is supported on the receiving jig, and the subsequent block that has come out of the die is stacked on the preceding block while the phase of the groove and the adhesive are shifted to bond them with the adhesive. [Effects of the Invention]

[0010] According to the present invention, a laminated core can be obtained that can easily and reliably prevent separation between the core pieces even when the number of core pieces is increased. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic cross-sectional view showing a manufacturing apparatus for a laminated iron core according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional view showing an enlarged portion of the manufacturing apparatus of FIG. [Figure 3] FIG. 3 is a schematic cross-sectional view showing an enlarged portion of the manufacturing apparatus of FIG. 1 when adjacent blocks are stacked. [Figure 4] FIG. 4 is a cross-sectional view showing an adhesive and grooves between adjacent blocks according to a modification of the first embodiment. [Figure 5] FIG. 5 is a cross-sectional view showing an adhesive and grooves between adjacent blocks according to another modification of the first embodiment. [Figure 6] 6(A) to 6(C) are plan views showing the phases of the adhesive and grooves of adjacent blocks according to Example 2 of the present invention. [Figure 7] 7A and 7B are plan views showing the phases of the adhesive and grooves of adjacent blocks according to Example 3 of the present invention. [Figure 8] 8(A) to 8(C) are plan views showing the phases of the adhesive and grooves of adjacent blocks according to Example 4 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] The objective of obtaining a laminated core that can easily and reliably prevent peeling between core pieces even when the number of core pieces is increased was achieved by bonding the blocks to which multiple core pieces are bonded together after removing them from the die.

[0013] That is, in the manufacturing method of the laminated core 1, a plurality of core pieces 7 are sequentially punched out of a magnetic steel plate 5 having an adhesive 25 by a punch 11 and held in a die 13, thereby forming a plurality of stacked blocks 9 in which the core pieces 7 are adhered with the adhesive 25. Between the ends of adjacent blocks 9, the adhesive 25 of one block 9 is positioned in a groove 27 of the other block 9, preventing adhesion between the adjacent blocks 9. Furthermore, among the adjacent blocks 9, the preceding block 9 that has been released from the die 13 and separated from the succeeding block 9 is supported on a receiving jig 15. Thereafter, the succeeding block 9 that has been released from the die 13 is stacked on the preceding block 9 while shifting the phase of the groove 27 and the adhesive 25, thereby adhering the preceding and succeeding blocks 9 with the adhesive 25.

[0014] When stacking the subsequent block 9 on the preceding block 9, the die 13 or the receiving jig 15 can be rotated to shift the phase of the groove 27 and the adhesive 25.

[0015] The preceding block 9 may be rotated before the holding of the subsequent block 9 begins, so that the phase of the groove 27 and adhesive 25 of the adjacent block 9 within the die 13 is aligned after the holding of the subsequent block 9 begins.

[0016] The adhesive 25 may be arranged at multiple locations on imaginary circles of different diameters, and the grooves 27 may be arranged at multiple locations on imaginary circles of different diameters corresponding to the adhesive 25, so that the phases of the grooves 27 on the same imaginary circle of adjacent blocks 9 within the die 13 are aligned with the phases of the adhesive 25.

[0017] The laminated core manufacturing apparatus 3 includes a punch 11, a die 13, and a receiving jig 15. The punch 11 punches out core pieces 7 from a magnetic steel plate 5 having an adhesive 25. The die 13 sequentially holds the plurality of core pieces 7 punched out by the punch 11, thereby forming a plurality of blocks 9 that are laminated and bonded together by the adhesive 25. The receiving jig 15 supports the blocks 9.

[0018] Within the die 13, between the ends of adjacent blocks 9, the adhesive 25 of one block 9 is positioned within the groove 27 of the other block 9, thereby preventing adhesion between the adjacent blocks 9 by the adhesive 25. Then, among the adjacent blocks 9, the preceding block 9 that has been removed from the die 13 and separated from the succeeding block 9 is supported on the receiving jig 15. Thereafter, the succeeding block 9 that has been removed from the die 13 is stacked on the preceding block 9 while shifting the phase of the groove 27 and the adhesive 25, thereby bonding them together with the adhesive 25. [Example]

[0019] [Laminated iron core extrusion equipment] Fig. 1 is a schematic cross-sectional view showing a laminated iron core manufacturing apparatus according to Example 1 of the present invention, Fig. 2 is a schematic cross-sectional view showing an enlarged portion of the manufacturing apparatus of Fig. 1.

[0020] The manufacturing apparatus 3 for laminated cores 1 is used in a method for manufacturing laminated cores 1, which are rotor cores or stator cores for electric motors or generators, and is incorporated into a manufacturing line, for example. This manufacturing apparatus 3 sequentially punches out a plurality of core pieces 7 from supplied magnetic steel plates 5, stacking them to form a plurality of blocks 9, and stacks the plurality of blocks 9 to form the laminated core 1.

[0021] The manufacturing apparatus 3 of this embodiment includes a punch 11, a die 13, a receiving jig 15, and a control unit 17.

[0022] The punch 11 is provided in an upper die (not shown) and is configured to be able to move up and down freely. The die 13 is provided in a lower die (not shown) and is arranged corresponding to the punch 11. The punch 11 and die 13 sequentially punch out a plurality of core pieces 7 from a magnetic steel sheet 5 supplied between the upper die and the lower die, and hold them in the die 13.

[0023] The die 13 of this embodiment includes a die holder 19, a die body 21, and a squeeze ring 23.

[0024] A die main body 21 and a squeeze ring 23 are supported on the die holder 19. The die main body 21 is formed in a ring shape and is fixed to the inner periphery of a support hole 19a of the die holder 19. Note that the die main body 21 and the squeeze ring 23 may be directly supported on the lower die, without the die holder 19.

[0025] The squeeze ring 23 is disposed adjacent to the die body 21 in the punching direction of the iron core pieces 7, and is supported on the inner periphery of the support hole 19a in the same manner as the die body 21. The squeeze ring 23 is formed in a ring shape that is longer in the punching direction than the die body 21 and has a smaller inner diameter.

[0026] The punching direction coincides with the lamination direction of the core pieces 7, which is the vertical direction in this embodiment. However, the punching direction and lamination direction do not necessarily have to be the vertical direction.

[0027] The squeeze ring 23 is a part that applies lateral pressure to hold the punched core pieces 7 by pressing them from the outer periphery. It is also possible to omit the squeeze ring 23. In this case, the die main body 21 can be extended in the punching direction or the support hole 19a of the die holder 19 can be reduced in diameter to provide the function of the squeeze ring 23.

[0028] In the squeeze ring 23, a plurality of held core pieces 7 are stacked one on top of another to form a block 9. In this embodiment, a plurality of completed blocks 9 are positioned in the squeeze ring 23.

[0029] However, depending on the length of the squeeze ring 23, a single completed block 9 may be positioned next to an incomplete block 9. The number of core pieces 7 constituting a block 9 is arbitrary, and does not need to be constant across the blocks 9 but may vary.

[0030] Within each block 9, adjacent core pieces 7 are bonded together with adhesive 25. Between the ends of adjacent blocks 9 within the die 13, the adhesive 25 of one block 9 is located within a groove 27 of the other block 9, preventing adhesion between the adjacent blocks 9.

[0031] In this embodiment, the adhesive 25 of the succeeding block 9 is located in the groove 27 of the preceding block 9. Note that the space between the ends of the blocks 9 includes not only the space between the ends of the completed blocks 9, but also the space between the end of the completed block 9 and the end of the subsequent unfinished block 9.

[0032] The groove portion 27 is formed as a groove in the end face of one end of each block 9. In this embodiment, the groove portion 27 is formed as a hole having a circular planar shape that penetrates the core piece 7 located at the upper end.

[0033] The planar shape and depth of the grooves 27 can be set as long as the adhesive 25 can be positioned inside to prevent adhesion between the blocks 9. For example, the grooves 27 may be recesses that do not penetrate the core pieces 7 or notches that extend from the outer periphery of the core pieces 7. Furthermore, it is preferable that the grooves 27 are set so as not to come into contact with the adhesive 25 placed inside, but they may also be in partial contact.

[0034] The adhesive 25 is applied in advance (not shown) to the magnetic steel plate 5 upstream in the supply direction to the punch 11 and the die 13. The application of the adhesive 25 can be achieved by a well-known method.

[0035] In this embodiment, the adhesive 25 is applied partially to multiple locations on only one side (the bottom surface in this embodiment) in the punching direction of the magnetic steel plate 5, in the portions that will become the core pieces 7. Therefore, the punched core pieces 7 have the adhesive 25 applied to their bottom surfaces. However, the adhesive 25 may also be applied to both sides of the core pieces 7. Note that in the core pieces 7 where the grooves 27 are provided, the adhesive 25 and the grooves 27 are out of phase with each other. Of the adhesive 25 of the core pieces 7 where the grooves 27 are provided, only the adhesive 25 that interferes with the grooves 27 may be left unapplied.

[0036] The adhesive 25 in this embodiment is applied in dots, but may also be applied in layers to a portion of the iron core piece 7. Various types of adhesive 25 can be used, such as thermosetting, anaerobic, and ultraviolet curing adhesives.

[0037] The receiving jig 15 supports the block 9 that has been removed from the die 13. The receiving jig 15 may be any jig that can support the block 9, and may be a dedicated jig, a welding jig, or a conveying device for the next process.

[0038] The release of the block 9 from the die 13 means that the block 9 is released from the hold by the die 13. In this embodiment, the release of the block 9 from the hold by the die 13 means that the block 9 is released from the squeeze ring 23 and released from the lateral pressure.

[0039] The receiving jig 15 of this embodiment is configured as a plate supported so as to be rotatable about its axis, and receives the block 9 placed on its upper surface. The receiving jig 15 is provided with a pin 15a, which engages with the placed block 9 in the rotational direction.

[0040] The rotation of the receiving jig 15 is performed by an appropriate driving device such as a servo motor. The angle (predetermined angle) of one rotation of the receiving jig 15 is arbitrary and can be set to 30 degrees, 60 degrees, 90 degrees, 120 degrees, 180 degrees, etc. The receiving jig 15 can also be configured not to rotate.

[0041] The control unit 17 is made up of an information processing device having a processor and a memory, and controls each part of the manufacturing apparatus 3. The control unit 17 may be not only a single information processing device, but also a combination of multiple information processing devices.

[0042] The control unit 17 of this embodiment controls the punch 11 to hold the core pieces 7 punched out from the magnetic steel plate 5 in the die 13. The control unit 17 then repeats the holding of these core pieces 7 by punching out, thereby forming a block 9 in which a predetermined number of core pieces 7 are stacked.

[0043] Furthermore, the control unit 17, through punching and holding of the core piece 7, causes the preceding block 9, which has been removed from the die 13 and separated from the succeeding block 9, to be supported by the receiving jig 15. Then, the control unit 17 controls the rotation of the receiving jig 15 or the die 13 to rotate the preceding or succeeding block 9.

[0044] This allows the phase of the adhesive 25 of the subsequent block 9 to be shifted relative to the phase of the groove portion 27 of the previous block when the subsequent block 9 is stacked on top of the previous block 9 after being removed from the die 13, as will be described later.

[0045] [Laminated core manufacturing method] In the manufacturing method of the laminated core 1 of this embodiment, first, as shown in Fig. 1, a magnetic steel sheet 5 is supplied between an upper die (punch 11) and a lower die (die 13). During this supply, the magnetic steel sheet 5 is repeatedly fed and stopped. Then, as shown in Figs. 1 and 2, each time the sheet is stopped, an annular plate-shaped member, a core piece 7, is punched out of the magnetic steel sheet 5 by the punch 11 and held within the die 13.

[0046] The punched core pieces 7 are held by applying lateral pressure with a squeeze ring 23 after the core pieces 7 pass through the die main body 21. By holding them in this manner, the multiple punched core pieces 7 are stacked while being bonded together with adhesive 25 on their undersides.

[0047] When a predetermined number of core pieces 7 are adhered and stacked in this way, a block 9 is formed from these stacked core pieces 7. On this block 9 (preceding block 9), the core pieces 7 for forming the next block 9 (subsequent block 9) are held by the die 13.

[0048] At this time, the adhesive 25 of the core piece 7 of the subsequent block 9 is located in the groove 27 located at the upper end of the preceding block 9. Because the adhesive 25 in the groove 27 does not come into contact with the inner surface of the groove 27, adhesion of the core piece 7 of the subsequent block 9 stacked on the preceding block 9 is avoided. In other words, adhesion of adjacent blocks 9 is avoided between the ends of the adjacent blocks 9.

[0049] 3(A) and (B) are cross-sectional views showing a part of the manufacturing apparatus 1 when the block B is received on the receiving jig 7. FIG.

[0050] The block 9 formed inside the die 13 as described above is gradually pushed forward in the punching direction, that is, out of the lower die 13 in this embodiment, as the core pieces 7 are punched and held. The block 9 that is pushed out of the die 13 falls as it is and is received on the receiving jig 15 as shown in Figure 3(A). Note that the block 9 that abuts on the upper surface of the receiving jig 15 does not have adhesive 25 applied to the core pieces 7 that are the bottom layer.

[0051] The preceding block 9 that has been removed from the die 13 and received on the receiving jig 15 is separated from the succeeding block 9. Each block 9 has enough iron core pieces 7 bonded together to prevent peeling between the iron core pieces 7 due to their own weight during the process of removing from the die 13.

[0052] Furthermore, since the core pieces 7 are deformed when subjected to lateral pressure within the die 13, the greater the number of core pieces 7 used in the block 9, the greater the impact of the deformation on peeling between the core pieces 7. In the block 9 of this embodiment, a number of core pieces 7 are bonded together to make it less susceptible to the effects of deformation.

[0053] Therefore, in this embodiment, the block 9 can be reliably received by the receiving jig 15 while preventing separation between the core pieces 7. The number of core pieces 7 that make up the block 9 is set appropriately depending on the characteristics of the adhesive 25 and the characteristics of the core pieces 7.

[0054] The receiving jig 15 supporting the preceding block 9 is rotated as shown in Figure 3(B). Note that the die 13 may be rotated instead of the receiving jig 15. The rotation of the receiving jig 15 may be performed based on the number of core pieces 7 punched out, a signal from a sensor, etc. When the receiving jig 15 rotates, the preceding block 9 rotates together.

[0055] This rotation causes the groove 27 of the preceding block 9 to be out of phase with the adhesive 25 of the succeeding block 9. With the groove 27 and adhesive 25 out of phase, the succeeding block 9 that has been removed from the die 13 is stacked on top of the preceding block 9, as shown in FIG.

[0056] As a result, the adhesive 25 of the subsequent block 9 comes into contact with the upper end surface of the block 9, and the preceding and subsequent blocks 9 are bonded together by the adhesive 25. In this embodiment, the laminated core 1 is formed by bonding these two blocks 9. However, the laminated core 1 may also be formed by bonding three or more blocks 9 together.

[0057] In this way, in the manufacturing apparatus 3 of this embodiment and the manufacturing method using the same, by removing a block 9 to which a number of core pieces 7 that can suppress peeling between the core pieces 7 are bonded from the die 13 and then bonding them together, it is possible to suppress peeling between the core pieces 7 even if the total number of core pieces 7 that make up the laminated core 1 is increased.

[0058] In addition, in this embodiment, by simply controlling the punch 11 to punch and hold the core pieces 7 and the receiving jig 15, the blocks 9 can be bonded together outside the die 13 with great ease to obtain the laminated core 1.

[0059] [Variations] 4 and 5 are cross-sectional views showing adhesive and grooves between adjacent blocks according to modifications of Example 1. Note that Fig. 4 and Fig. 5 show a state in which the core pieces 7 constituting the following block 9 are stacked on the preceding block 9.

[0060] In the modified example of FIG. 4, the groove 27 is formed by connecting holes that penetrate multiple core pieces 7 located at the upper end of the block 9. In this modified example, the groove 27 is provided across two core pieces 7. This makes it possible to suppress adhesion between the blocks 9 by the adhesive 25 even if the adhesive 25 becomes long in the punching direction due to the amount or dripping. The groove 27 may also be provided across three or more core pieces 7.

[0061] 5, a groove 27 is provided in the core piece 7 at the lower end of the block 9. In this modification, an adhesive 25 is applied to the upper surface of the core piece 7.

[0062] The modifications of FIGS. 4 and 5 can also achieve the same effects as those of the first embodiment. [Example]

[0063] 6(A) to 6(C) are plan views showing the phases of the adhesive and grooves of adjacent blocks according to Example 2 of the present invention. Note that Example 2 shares a basic configuration with Example 1, so components corresponding to those in Example 1 are denoted by the same reference numerals and redundant explanations will be omitted. In Fig. 6, the core piece 7 at the bottom end of the following block 9 is shown on the left, and the core piece 7 at the top end of the preceding block 9 is shown on the right.

[0064] In this embodiment, the adhesive 25 can be applied to the core pieces 7 having the grooves 27 in the same manner as the other core pieces 7 .

[0065] That is, as shown in Figure 6(A), before the core piece 7 at the lower end of the subsequent block 9 and the core piece 7 at the upper end of the preceding block 9 are held in the die 13, the groove portion 27 of the core piece 7 of the preceding block 9 is positioned out of phase with the adhesive 25 of the core piece 7 of the subsequent block 9.

[0066] This phase shift is set by shifting the formation position of the groove 27 from the application position of the adhesive 25 in the core piece 7 at the upper end of the preceding block 9. This shift makes it possible to apply the adhesive 25 to the core piece 7 having the groove 27 in the same way as the other core pieces 7.

[0067] Next, as shown in Figure 6(B), when the iron core piece 7 at the lower end of the subsequent block 9 and the iron core piece 7 at the upper end of the preceding block 9 are held in the die 13, that is, after the subsequent block 9 has started to be held, the phase of the groove portion 27 of the adjacent block 9 within the die 13 is matched with the phase of the adhesive 25 to avoid adhesion between the adjacent blocks 9.

[0068] Specifically, the preceding block 9 is rotated before the holding of the succeeding block 9 begins. The rotation of the preceding block 9 is performed by rotating the die 13. In this embodiment, the holding of the succeeding block 9 begins when the holding of the core piece 7 at the bottom end of the succeeding block 9 begins.

[0069] By rotating the preceding block 9 in this manner, the adhesive 25 of the succeeding block 9 and the groove 27 of the preceding block 9 can be aligned in phase.

[0070] As shown in Figure 6(C), when the iron core piece 7 at the bottom end of the subsequent block 9 and the iron core piece 7 at the top end of the preceding block 9 are removed from the die 13, the adhesive 25 of the subsequent block 9 and the groove portion 27 of the preceding block 9 are out of phase with each other.

[0071] This phase shift occurs after the preceding block 9 is released from the die 13. In this embodiment, the preceding block 9 is rotated by the receiving jig 15, as in the first embodiment. This returns the phase of the adhesive 25 of the following block 9 and the groove 27 of the preceding block 9 to the initial state. Note that the following block 9 may also be rotated by the die 13.

[0072] Then, similarly to the first embodiment, the subsequent block 9 is removed from the die 13 and is stacked and adhered directly onto the preceding block 9 .

[0073] In this way, in this embodiment, the preceding block 9 is rotated before the holding of the subsequent block 9 begins, and the phase of the groove portion 27 of the adjacent block 9 and the adhesive 25 within the die 13 are aligned after the holding of the subsequent block 9 begins.

[0074] Therefore, in this embodiment, in the core piece 7 having the groove portion 27, the groove portion 27 can be formed at a position that is out of phase with respect to the application position of the adhesive 25, making it possible to apply the adhesive 25 in the same way as the other core pieces 7.

[0075] In addition, the second embodiment can also achieve the same effects as the first embodiment. [Example]

[0076] 7A and 7B are plan views showing the phases of the adhesive and grooves of adjacent blocks according to Example 3 of the present invention. Note that Example 3 shares a basic configuration with Example 1, so the same reference numerals are used to indicate components corresponding to those in Example 1, and redundant explanations will be omitted. In Fig. 7, the iron core piece 7 at the bottom end of the following block 9 is shown on the left, and the iron core piece 7 at the top end of the preceding block 9 is shown on the right.

[0077] In this embodiment, a plurality of blocks 9 are stacked in a rotating manner with at least adjacent blocks 9 being out of phase with each other. In this embodiment, the arrangement angle of the grooves 27 and adhesive 25 of each block 9 is set to the same as the rolling angle.

[0078] That is, the adhesives 25 and grooves 27 are arranged at predetermined intervals in the circumferential direction, and in this embodiment, at 90-degree intervals. Adhesives 25 that face each other across the center in the radial direction are located on imaginary circles of the same diameter, and adjacent adhesives 25 in the circumferential direction are located on imaginary circles of different diameters. As a result, the adhesives 25 are arranged in multiple locations on imaginary circles of different diameters.

[0079] Similarly, grooves 27 that face each other across the center in the radial direction are located on imaginary circles of the same diameter, and adjacent grooves 27 in the circumferential direction are located on imaginary circles of different diameters. As a result, grooves 27 are arranged at multiple locations on imaginary circles of different diameters corresponding to adhesive 25.

[0080] 7(A), the grooves 27 and adhesive 25 on imaginary circles of the same diameter of adjacent blocks 9 are in phase with each other within the die 13. Therefore, between the ends of adjacent blocks 9, the adhesive 25 of the succeeding block 9 is located within the grooves 27 of the preceding block 9.

[0081] As shown in Figure 7(B), when the iron core piece 7 at the bottom end of the subsequent block 9 and the iron core piece 7 at the top end of the preceding block 9 are removed from the die 13, the adhesive 25 of the subsequent block 9 is positioned out of phase with the groove portion 27 on the virtual circle of the same diameter of the preceding block 9.

[0082] This phase shift is generated by rotating the preceding block 9 that has passed through the die 13 by, for example, 90°, which is the rotation angle, by the receiving jig 15 .

[0083] Thereafter, the succeeding block 9 coming off the die 13 is stacked and adhered directly onto the preceding block 9.

[0084] In this embodiment, the rotation of the blocks 9 during stacking can be utilized to bond adjacent blocks 9 with the grooves 27 and adhesive 25 out of phase with each other. In addition, this embodiment can also achieve the same effects as those of the first embodiment. [Example]

[0085] 8(A) to 8(C) are plan views showing the phases of the adhesive and grooves of adjacent blocks according to Example 4 of the present invention. Note that Example 4 shares the same basic configuration as Example 1, and therefore components corresponding to those in Example 1 are denoted by the same reference numerals, and redundant explanations will be omitted. In FIG. 8, the iron core piece 7 at the bottom end of the following block 9 is shown on the left, and the iron core piece 7 at the top end of the preceding block 9 is shown on the right. Also, the arrows in FIG. 8 indicate the phases of the iron core pieces 7.

[0086] In the fourth embodiment of FIG. 8, when lamination is performed as in the third embodiment, the adhesive 25 can be applied to the core pieces 7 having the grooves 27 as in the second embodiment in the same manner as to the other core pieces 7.

[0087] That is, as shown in Figure 8(A), before the iron core piece 7 at the lower end of the subsequent block 9 is held by the die 13, the groove portion 27 of the preceding block 9 is positioned out of phase with the adhesive 25 of the subsequent block 9.

[0088] In this embodiment, all of the adhesives 25 and grooves 27 are located on the same imaginary circle in each block 9. The spacing between the adhesives 25 and grooves 27 is the same as the rotation angle, for example, 90 degrees.

[0089] The phase shift between the grooves 27 is set by shifting the formation position of the grooves 27 from the application position of the adhesive 25, with the angle of shift being α. This shift makes it possible to apply adhesive 25 to the core pieces 7 having the grooves 27 in the same way as the other core pieces 7.

[0090] Next, as shown in Figure 8(B), when the iron core piece 7 at the lower end of the subsequent block 9 and the iron core piece 7 at the upper end of the preceding block 9 are held in the die 13, that is, after the subsequent block 9 begins to be held, the phases of the grooves 27 and adhesive 25 of adjacent blocks 9 within the die 13 are aligned to avoid adhesion between adjacent blocks 9.

[0091] Specifically, before the subsequent block 9 starts to be held, the preceding block 9 is rotated by the angle α by the die 13 to eliminate misalignment between the groove 27 and the adhesive 25 .

[0092] The rotation angle of the preceding block 9 may be an angle obtained by adding an angle α to 90 degrees, as long as the phase of the groove 27 and adhesive 25 of the adjacent block 9 in the die 13 are aligned.

[0093] Then, as shown in Figure 8(C), when the iron core piece 7 at the bottom end of the subsequent block 9 and the iron core piece 7 at the top end of the preceding block 9 are removed from the die 13, the adhesive 25 of the subsequent block 9 and the groove portion 27 of the preceding block 9 are out of phase with each other.

[0094] This phase shift is generated by rotating the preceding block 9 using the receiving jig 15 after the preceding block 9 has been released from the die 13. The amount of rotation at this time is the amount obtained by subtracting the angle α of the preceding rotation from the rotation angle of 90 degrees. Note that the succeeding block 9 may also be rotated by the die 13.

[0095] Then, when the succeeding block 9 passes through the die 13, the succeeding block 9 is stacked and adhered directly onto the preceding block 9, as in the third embodiment.

[0096] Therefore, in this embodiment, too, the adhesive 25 can be applied to the core pieces 7 having the grooves 27 in the same way as the other core pieces 7, as in embodiment 2, and adjacent blocks 9 can be bonded with the grooves 27 and adhesive 25 shifted in phase by utilizing the rotation of the blocks 9 during rolling, as in embodiment 3. Also, in this embodiment, the blocks 9 are rotated by the rolling angle by the sum of the rotation of the die 13 and the rotation of the receiving jig 15, so the rotation load on the die 13 and the receiving jig 15 is small. In addition, this embodiment can also achieve the same effects as embodiment 1. [Explanation of symbols]

[0097] 1 Laminated core 3 Manufacturing equipment 5 Magnetic steel plate 7 Core pieces 9 blocks 11 Punch 13 Die 15 Receiving jig 17 Control Unit 25 Adhesive 27 Groove

Claims

1. A plurality of iron core pieces are successively punched out of a magnetic steel plate having an adhesive thereon by a punch and held in a die, thereby forming a plurality of blocks in which the iron core pieces are stacked while being bonded by the adhesive; Between the ends of adjacent blocks, the adhesive of one block is located in the groove of the other block to prevent adhesion between the adjacent blocks; Supporting the preceding block, which has been released from the die and separated from the subsequent block, on a receiving jig; stacking the subsequent block removed from the die on the preceding block while shifting the phase of the groove and the phase of the adhesive, thereby bonding the preceding and subsequent blocks together with the adhesive; Manufacturing method of laminated core.

2. A method for manufacturing a laminated core according to claim 1, When stacking the subsequent block on the preceding block, the die or the receiving jig is rotated to shift the phase of the groove and the phase of the adhesive. Manufacturing method of laminated core.

3. 3. A method for manufacturing a laminated core according to claim 2, rotating the preceding block before the subsequent block begins to be held, and aligning the phase of the groove of the adjacent block with the phase of the adhesive within the die after the subsequent block begins to be held; Manufacturing method of laminated core.

4. A method for manufacturing a laminated core according to claim 2 or 3, The adhesive is disposed at a plurality of locations on an imaginary circle having different diameters, the grooves are arranged at a plurality of locations on an imaginary circle having different diameters corresponding to the adhesive; the grooves on the same imaginary circle of the adjacent blocks are aligned in phase with the adhesive within the die; Manufacturing method of laminated core.

5. a punch for punching out an iron core piece from a magnetic steel plate having an adhesive; a die that sequentially holds the plurality of iron core pieces punched out by the punch to form a plurality of stacked blocks while bonding them together with the adhesive; a receiving jig for supporting the block, Between the ends of adjacent blocks in the die, the adhesive of one block is positioned in the groove of the other block to prevent adhesion between the adjacent blocks by the adhesive; Supporting the preceding block, which has been released from the die and separated from the subsequent block, on a receiving jig; the subsequent block removed from the die is stacked on the preceding block while shifting the phase of the groove and the adhesive, thereby bonding the subsequent block with the adhesive; Laminated core manufacturing equipment.

6. The laminated core manufacturing apparatus according to claim 5, When stacking the subsequent block on the preceding block, the die or the receiving jig is rotated to shift the phase of the groove and the phase of the adhesive. Laminated core manufacturing equipment.

7. The laminated core manufacturing apparatus according to claim 6, rotating the preceding block before the subsequent block begins to be held, and aligning the phase of the groove of the adjacent block with the phase of the adhesive within the die after the subsequent block begins to be held; Laminated core manufacturing equipment.

8. The laminated core manufacturing apparatus according to claim 6 or 7, The adhesive is disposed at a plurality of locations on an imaginary circle having different diameters, the grooves are arranged at a plurality of locations on an imaginary circle having different diameters corresponding to the adhesive; the grooves on the same imaginary circle of the adjacent blocks are aligned in phase with the adhesive within the die; Laminated core manufacturing equipment.

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