JP2013138579A - Lamination iron core and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamination iron core which prevents displacement of each block iron core separable into upper and lower pieces, and to provide a manufacturing method of the lamination iron core.SOLUTION: Iron core pieces 13, 14 are punched out from a plate material, and the multiple iron core pieces 13, 14 are laminated and coupled to each other to form a block iron core 11. The multiple block iron core 11 are laminated to form a lamination iron core 10. In the lamination iron core 10, a connection member 12 is disposed between the block iron cores 11 located adjacent to each other in a vertical direction so as to partially engage with the block iron cores 11 thereby preventing the lamination iron core 10 from losing its shape and being disassembled.

Description

In the present invention, core pieces (referred to as rotor core pieces and stator core pieces) are punched out of a plate-shaped material, and a plurality of core pieces are stacked in a mold to form a block core, and a plurality of layers are stacked. Provided are, for example, a laminated core (rotor laminated core or stator laminated core) in which block iron cores are temporarily connected by a connecting member and can be easily removed, and a method for manufacturing the same.
About.

Laminated iron cores are formed by laminating iron core pieces punched from plate-like material. However, because the plate-like material has a thickness deviation, the iron core pieces can be placed an arbitrary number of times before the iron core pieces are laminated. Rolling is performed by rotating and laminating to eliminate the thickness deviation of the material (see Patent Document 1). By performing rolling, dimensional accuracy such as perpendicularity and parallelism of the laminated iron core can be improved, which is a very effective means for improving motor characteristics.

In this rolling, when a rolling device is incorporated in a punching die for producing an iron core piece (so-called in-mold rolling), or when a rolling device is installed outside the punching die (so-called so-called in-mold rolling) (External die-transfer). In the latter case, the core pieces are punched and formed with a punching die, and the laminated cores (so-called block cores) stacked in an arbitrary thickness are discharged out of the mold. It is rotated by the number of times, and transposition is performed.

The lowermost part of each block iron core is an iron core piece in which only a through hole is provided at the position of the caulking portion in order to release interference of caulking protrusions provided for the purpose of fixing the iron core pieces together. Thereby, each block iron core can be smoothly transposed.

After this rolling, for example, in the case of a stator laminated core, the block cores are fixed by welding. In the case of the rotor laminated iron core, the block iron cores are fixed to each other by using the resin-binding force by having a step of filling the magnet insertion holes with resin in a state where the block iron cores are stacked.

JP 2011-156585 A

However, when manufacturing a laminated iron core by mold out-rolling as described above, the block iron cores discharged from the mold are laminated and conveyed without being connected to each other. Alternatively, the rolling direction of each block iron core may be shifted at the timing of loading into the transport vehicle and sampling from the transport vehicle. And once the roll-over direction of the block core is shifted, it is very difficult to reproduce it in the original direction. Therefore, there is a demand for a method of temporarily fixing the block cores and transporting them outside the mold.

This invention is made | formed in view of this situation, and it aims at providing the laminated core which prevents the shift | offset | difference of each block iron core separable up and down, and its manufacturing method.

The laminated core according to the first aspect of the present invention is formed by punching an iron core piece from a plate-like material, laminating a plurality of the iron core pieces and connecting the iron core pieces to form a block iron core, and the block iron core In a laminated core formed by laminating a plurality of layers,
Between the block iron cores adjacent to each other in the vertical direction, connecting members that partially engage with each other were arranged to prevent the laminated iron core from being deformed (including load collapse and misalignment) and from being decomposed.

The laminated core according to the second invention is the laminated core according to the first invention, wherein the core pieces constituting each of the block iron cores are connected via a caulking portion.

A laminated core according to a third invention is the laminated core according to the first and second inventions, wherein the plate-like connecting member is caulked through formed in an iron core piece located at the lowest part of the upper block iron core. A first caulking projection that fits into the hole and a second caulking projection that fits into the caulking recess of the caulking portion formed on the uppermost iron core piece of the lower block core are provided.

The laminated core according to a fourth aspect of the present invention is the laminated core according to the first and second aspects of the invention, wherein the plate-like connecting member is a caulking portion formed on the core piece located at the lowest part of the upper block core. A caulking through hole that fits into the caulking projection and a caulking projection that fits into the caulking recess of the caulking portion formed on the uppermost iron core piece of the lower block iron core are provided.

A laminated core according to a fifth invention is the laminated iron core according to the first and second inventions, wherein the upper side of the connecting member is hooked on a first engaging portion provided at the lower part of the upper block core. A second engaging portion to be stopped is provided on the lower side of the connecting member, and a fourth engaging portion to be hooked on a third engaging portion provided on an upper portion of the lower block. .

A laminated core according to a sixth aspect of the present invention is the laminated core according to the first and second aspects, wherein the plate-like connecting member is formed on the core piece located at the lowermost part of the upper block core and is downwardly formed. A second cut and bent portion that fits into the first cut and bent portion that protrudes into the upper portion of the block core, and a caulking projection that fits into a caulking recess of the caulking portion that is formed on the uppermost part of the lower block core. Is provided.

The laminated iron core according to a seventh aspect is the laminated iron core according to the sixth aspect, wherein the second cut and bent part is connected to an inclined part having one end connected to the plate-like part and a base end to the other end of the inclined part. The second cut and bent portion is tapered from the inclined portion toward the tip of the parallel portion.

The laminated core according to an eighth aspect of the present invention is the laminated core according to the sixth or seventh aspect, wherein the first and second cut-and-bent portions are arranged such that the upper block core is positioned with respect to the lower block core. By relatively rotating, the first and second cut and bent portions are engaged.

The laminated core according to a ninth aspect is the laminated core according to the first to eighth aspects, wherein the connecting member is made of a material other than the plate-like material (for example, an aluminum plate, an aluminum alloy, copper, a copper alloy, stainless steel). Plate, iron plate, etc.).

The laminated iron core according to a tenth invention is the laminated iron core according to the first to ninth inventions, wherein the diameter of the connecting material is larger than the diameter of each core piece of the block iron core (for example, 1 of the diameter of the block iron core). 0.05 to 1.3 times).

A laminated iron core according to an eleventh invention is obtained by punching an iron core piece from a plate-like material, laminating a plurality of the iron core pieces, connecting the iron core pieces to form a block iron core, and laminating a plurality of the block iron cores. In the laminated iron core formed
A caulking through hole is provided at a lower position of the upper block core adjacent to the upper and lower block cores at a position different from the position of the caulking portion connecting the core pieces of the upper block core, and the lower block core On the upper part, caulking protrusions that fit into the caulking through holes were provided to prevent the laminated iron core from being deformed and decomposed.

A laminated core according to a twelfth aspect of the present invention is the laminated core according to any of the first to eleventh aspects, wherein the block cores stacked one above the other are rolled between the block cores.

According to a thirteenth aspect of the present invention, there is provided a method for manufacturing a laminated iron core, comprising: punching out an iron core piece from a plate-like material, forming a block iron core in which a plurality of the iron core pieces are laminated, and laminating the block iron core in a plurality of stages outside the mold. In the manufacturing method of the formed laminated core,
A connecting member is inserted between each of the block cores discharged from the mold, and the core piece located at the lowermost part of the block core and the connecting member are connected via the first and second engaging portions. And a step of connecting the core piece located at the uppermost part of the block core and the connecting member via third and fourth engaging portions, and each block core is formed by the connecting member. And a step of removing the connecting member when the plurality of block cores are connected and reinforced and used as the laminated core.

A method for manufacturing a laminated core according to a fourteenth aspect of the invention is the method of manufacturing a laminated core according to the thirteenth aspect of the invention, wherein the transposition between the block cores is performed after removing the connecting member.

According to a fifteenth aspect of the present invention, there is provided a method for manufacturing a laminated core, comprising: punching out an iron core piece from a plate-like material to form a block iron core in which a plurality of the iron core pieces are laminated; In the manufacturing method of the formed laminated core,
The core piece located at the bottom of each block core has a caulking through hole at a position different from the caulking portion connecting the core pieces of the block core, and is flat on the core piece located at the top of the block core. A step of forming a plurality of the block cores having a caulking protrusion or a cut and bent portion protruding upward at the same position as the caulking through hole as viewed;
Discharging the plurality of block iron cores from the mold in a state of being connected to the caulking through hole and the caulking protrusion or the cut and bent portion in the mold.

The laminated cores according to the first to twelfth inventions and the laminated core manufacturing methods according to the thirteenth to fifteenth inventions can be applied to both the rotor laminated core and the stator laminated core.

In the laminated iron core and the method of manufacturing the same according to the present invention, the following effects are obtained. (1) A connecting member that is partially engaged (for example, plate-like) is arranged between the block iron cores adjacent to each other in the vertical direction. Alternatively, when inserted, the positions of the upper and lower block cores are fixed, and it is possible to prevent the collapse, displacement and disassembly of the laminated core that is likely to occur during transportation.

(2) When connecting the upper and lower block iron cores by providing caulking portions (referring to one or more of caulking protrusions, caulking recesses, caulking through holes, and cutting and bending portions) to plate-like connecting members, block It is possible to change the caulking shape of only the uppermost part and / or the lowermost part of the iron core to cope with it, and it becomes easy to manufacture a laminated core.

(3) The first cut and bent portion is formed on the core piece located at the bottom of the block core, the second cut and bent portion is formed on the plate-like connecting member, and the connecting member is relatively rotated to engage the two. In this case, the block cores can be easily temporarily fixed because there is no pressure in the vertical direction. Here, by providing a taper shape in the cut and bent portion, the first and second cut and bent portions can be easily guided.

(4) If the connecting member is manufactured from a material other than the plate material constituting the block core, the amount of the plate material discarded can be reduced. The connecting member can be made of an inexpensive material and discarded, or in some cases, the connecting member is different from the iron core piece, and can be used repeatedly.

(5) If the outer diameter of the connecting member is larger than the diameter of the block core, it can be used as a starting point for stripping the connecting member (ie, separating each block core), improving the stripping workability. The working time can be shortened.

(6) When the uppermost part and the lowermost part of each block iron core are connected by a caulking part for temporary fixing (preferably easily removed) or the like, there is no need to provide a separate connecting member. Further, when part or all of the temporary fixing between the block cores is performed in the mold, the process can be shortened and the labor can be saved.

1 is a perspective view of a laminated iron core according to a first embodiment of the present invention. It is a perspective view which shows the manufacturing method of the same laminated iron core. (A)-(e) is explanatory drawing of the uppermost part of the upper and lower block iron cores which comprises the same laminated iron core, the lowermost iron core piece, and a plate-shaped connection member. It is a fragmentary sectional view of the same laminated iron core joined via a connecting member. It is a fragmentary sectional view of the laminated iron core which concerns on the 2nd Embodiment of this invention. (A), (b) is a top view of the core piece and connection member of the laminated core which concern on the 3rd Embodiment of this invention. It is a fragmentary sectional view of the laminated core. It is a perspective view of the laminated iron core which concerns on the 4th Embodiment of this invention. (A)-(e) is explanatory drawing of the core piece of the upper and lower block iron cores which comprises the same laminated iron core. It is a fragmentary sectional view of the laminated core.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, a laminated core (referring to either a stator laminated core or a rotor laminated core) 10 according to the first embodiment of the present invention includes a plurality of block iron cores 11 and this. And a plate-like connecting member 12 to be connected. These will be described in detail below.
Here, the block cores 11 are stacked without rolling the core pieces, and the block cores 11 are rolled between the block cores 11 connected by the connecting member 12.

As is well known, the block core 11 is supplied with a plate-like material (usually, a thin sheet of electromagnetic steel sheet) to a mold apparatus (not shown), punched and formed the core pieces 13 and 14, and the core piece 13 in the die mold. 14 are formed by caulking and stacking (see JP-A-06-233501 and JP-A-2004-187340). The iron core piece 13 is the lowermost iron core piece of the block iron core 11 and is different from the other iron core pieces 14 on it. The details are shown in FIGS.

As shown in FIGS. 3A and 3D, the iron core piece 14 is an iron core piece used for a normal laminated iron core, and a plurality of caulking portions 16 are formed. The caulking portion 16 is, for example, V caulking (or half caulking, cutting and bending), and includes a caulking concave portion 17 on the upper side and a caulking projection 18 on the lower side. On the other hand, as shown in FIGS. 3 (b) and 3 (e), the iron core piece 13 has caulking through holes 19 and 20. The caulking protrusion 18 of the upper iron core piece 14 is fitted into the caulking through hole 19. On the other hand, the caulking through-hole 20 is formed at the central angular position of the adjacent caulking through-holes 19 and is the same size as the caulking through-holes 19, but the caulking protrusions 18 of the upper iron core piece 14 are not fitted therein. .

The plate-like connecting member 12 is made of a metal plate (that is, a material other than the iron core piece) such as stainless steel, steel, and aluminum alloy, and has a thickness that is the same as or slightly smaller than the iron core pieces 13 and 14. The connecting plate member 12 is provided with caulking portions 22 and 23. The caulking portion 23 is provided at the central angular position of the plural caulking portions 22.

As shown in FIG. 4, the caulking portion 22 has a downward caulking projection 24 (an example of a second caulking projection), and the caulking portion 23 has an upward convex caulking projection 25 (the first caulking projection 25), like the caulking portion 16. An example of a caulking projection). The caulking protrusion 24 (an example of the fourth engaging portion) is a caulking concave portion 17 (third core portion) of the iron core piece 14 (that is, the iron core piece located at the uppermost portion of the lower block iron core 11) immediately below the connecting member 12. An example of the engaging portion is inserted into the caulking projection 25 (an example of the second engaging portion) of the iron core piece 13 (an iron core piece positioned at the lowest part of the upper block iron core 11) just above the connecting member 12. The caulking through hole 20 (an example of the first engaging portion) is inserted into the structure. The caulking portion 23 is fitted into the caulking through hole 20, and these may be provided in a range that does not affect the magnetic flux of the laminated iron core, or a plurality of them may be provided.

Here, the width of the caulking protrusion 25 of the caulking portion 23 is smaller than the width of the caulking through hole 20, and the width of the caulking protrusion 24 of the caulking portion 22 is slightly smaller than the width of the caulking concave portion 17. The connecting member 12 can be easily separated from the upper block iron core 11 and the lower block iron core 11 by reducing the size. It is possible to make the width of the caulking protrusion 25 the same as the width of the caulking through-hole 20, and the width of the caulking protrusion 24 and the caulking concave part 17 to be the same. However, in this case, it is somewhat difficult to peel off the connecting member 12. It is preferable to use a material softer than the iron core pieces 13 and 14 for the connecting member 12.

Since the laminated iron core 10 is configured as described above, a plurality of block iron cores 11 can be connected using the connecting member 12. Therefore, the block cores 11 are sequentially manufactured by the press mold apparatus, and the block cores 11 discharged from the mold are temporarily connected by the separately manufactured connecting members 12. In transporting the laminated iron core 10, each block iron core 11 is connected (and reinforced) so that the block iron core 11 is not easily separated even with respect to vertical movement without lateral movement by the connecting member 12. No load collapse or shift occurs. When removing the connecting member 12 from the laminated core 10, the connecting member 12 can be easily removed because the diameter of the connecting member 12 is larger than the diameter of the block core 11 (for example, 1.05 to 1.3 times). Here, the plate-like connecting member 12 may be formed of the same material as the iron core piece. In this case, the connecting member 12 can be manufactured by the same mold apparatus.

Subsequently, a laminated core 30 according to a second embodiment of the present invention will be described with reference to FIG. In addition, the same component as the laminated core 10 which concerns on 1st Embodiment attaches | subjects the same number, and abbreviate | omits description (it is the same hereafter).
In the laminated iron core 30, a plurality of block iron cores 33 are temporarily connected by plate-like connecting members 32. The block iron core 33 has a lowermost iron core piece 31 and a plurality of iron core pieces 14 stacked thereon. As with the iron core piece 13, a plurality of caulking through holes 19 are provided in the iron core piece 31, and a caulking portion 34 is provided therebetween. The caulking portion 34 has a caulking projection 35 that protrudes downward.

The material of the connecting member 32 is the same as that of the connecting member 12 and has a caulking portion 22 having a caulking projection 24 that protrudes downward. The caulking protrusion 24 is fitted into the caulking concave portion 17 of the caulking portion 16 of the iron core piece 14 at the lower portion. On the other hand, the caulking protrusion 35 of the caulking portion 34 is fitted into a caulking through hole 37 formed in the connecting member 32.
As described above, the block iron core 33 is temporarily connected by the connecting member 32. Assembly and removal of the connecting member 32 are the same as in the first embodiment.

Next, a laminated core 40 according to a third embodiment of the present invention will be described with reference to FIGS.
In the laminated core 40, a block core 43 having an iron core piece 41 and an iron core piece 14 laminated thereon is temporarily connected by a connecting member 44 at the lowermost part. What is different from the laminated iron cores 10 and 30 according to the first and second embodiments is the lowermost iron core piece 41 and the connecting member 44, which will be described in detail.

As shown in FIG. 6A, the iron core piece 41 is formed with a plurality of caulking through holes 19, and the caulking protrusion 18 of the caulking portion 17 of the iron core piece 14 on the upper side of the block iron core 43 is fitted. On the other hand, the iron core piece 41 is formed with a first cut and bent portion 46 which is an example of a caulking portion and protrudes downward at a central angular position of the caulking through holes 19 adjacent to each other. The cut and bent portion 46 has an inclined portion 47 whose one end is connected to the iron core piece 41 itself and a parallel portion 48 whose base end is connected to the other end of the inclined portion 47. A first space 49 is provided on the front side of the cut and bent portion 46 of the iron core piece 41.

As shown in FIGS. 6B and 7, the plate-like connecting member 44 is provided with a caulking protrusion 24 that fits into the caulking concave portion 17. A second cut and bent portion 50 (an example of a caulking portion) that engages with the first cut and bent portion 46 is formed at the central angular position of the caulking protrusion 24 of the connecting member 44. The second cut and bent portion 50 includes an inclined portion 51 whose one end is connected to the plate-like portion of the connecting member 44 and a parallel portion 52 whose base end is connected to the other end of the inclined portion 51. On the side, a second space 53 is provided.

Therefore, when the upper and lower block iron cores 43 are connected by the connecting member 44, the caulking protrusion 24 of the connecting member 44 is first fitted into the caulking concave portion 17 of the iron core piece 14, and the stacked iron core pieces 14 and the connecting member 44 are connected. Connect. Next, a first cut and bent portion 46 formed downward on the core piece 41 at the bottom of the block iron core 43 and a second cut and bent portion 50 formed on the connecting member 44 are first and second. Then, the upper block iron core 43 is rotated relatively to engage the first and second cut and bent portions 46 and 50 with each other. In this case, it is preferable that the positions of the first and second cut and bent portions 46 and 50 are shifted by the engagement angle (θ) of the first and second cut and bent portions 46 and 50.

Here, it is preferable to form the first and second cut-and-bend portions 46 and 50 in a taper shape that becomes narrower toward the tip, whereby the engagement between the first and second cut-and-bend portions 46 and 50 is improved. improves. The first and second space portions 49 and 53 have such a length that the cut and bent portions 46 and 50 completely enter.

Further, the lowermost core pieces 55 and 56 of the laminated cores 30 and 40 according to the second and third embodiments are provided with caulking projections projecting downward and a first cut and projecting portion projecting downward. Not. Accordingly, the bottom surfaces of the laminated iron cores 30 and 40 are flat, but it is possible to provide a caulking protrusion that protrudes downward and a first cut and bent portion that protrudes downward.

Subsequently, a laminated core 60 according to a fourth embodiment of the present invention will be described with reference to FIGS. In this laminated iron core 60, no plate-like connecting member is provided between the plurality of block iron cores 61 to 63, and is provided at the lowermost part of the block iron cores 61, 62 and the uppermost part of the block iron cores 62, 63. The block cores 61 to 63 are connected by the core pieces 65 and 66 that are provided.

In this embodiment, the block iron core 61 is composed of a plurality of laminated iron core pieces 68 and iron core pieces 65 laminated at the lowermost part thereof, and the block iron core 62 is composed of the uppermost iron core piece 66 and the iron core piece 66 thereof. It is composed of an iron core piece 68 that is laminated below and an iron core piece 65 that is laminated at the bottom, and the block iron core 63 is an uppermost iron core piece 66 and an iron core piece 68 laminated below it. It is comprised by the iron core piece 65 arrange | positioned at the lowest part.

The iron core piece 68 is formed with a plurality of caulking portions 16 (4 in this embodiment) having caulking protrusions 18 that protrude downward and caulking concave portions 17 that are concave upward. In the iron core piece 65, a plurality of caulking through holes 19 are provided at positions corresponding to the caulking portions 16, and another caulking through hole 20 is provided at the center of the adjacent caulking through holes 19.

The iron core piece 66 arranged at the uppermost part of the block cores 62 and 63 is formed with the same caulking portion 16 as the iron core piece 68 and is caulked to match the caulking through hole 20 of the iron core piece 65 arranged above. A cut and bent portion 69 which is an example of the portion is formed. As shown in FIG. 10, the cut and bent portion 69 includes an inclined portion 70 having one end connected to the plate-like portion (plane portion) of the iron core piece 66 and a parallel portion 71 connected to the other end of the inclined portion 70. Have. A caulking projection may be provided instead of the cut and bent portion 69.

Therefore, when the laminated core 60 is manufactured, the block core 62 is placed on the block core 63 in the mold or outside the mold, and in this case, the block core 62 is provided on the uppermost core piece 66 of the block core 63. The cut and bent portion 69 is put into the caulking through hole 20 of the iron core piece 65 provided at the lowermost part of the block iron core 62. As a result, the block core 62 is temporarily connected to the block core 63. Further, the block iron core 61 is temporarily connected on the block iron core 62 by the same method. Thereby, the block iron cores 61, 62, and 63 adjacent in the vertical direction can be connected without a connecting member.

In the above-described embodiment, the upper and lower block cores are temporarily fixed via the caulking portion composed of the V-shaped caulking and the cut and bent portion, but the upper and lower block cores are prevented from shifting by simply combining the concave portion and the convex portion. The present invention also applies to cases.
In the above-described embodiment, the iron core piece in which the caulking through hole is formed at the lowermost part of the block core is used. However, when the caulking projection is upward, the iron core piece in which the caulking through hole is formed in the uppermost part of the block iron core. Can also be used.
Moreover, in the said embodiment, although the plate-shaped connection member was used, it is an irregular thing (For example, square shape, such as a quadrangle | tetragon, the core piece which has the ear | edge which protrudes radially outward from a laminated core partially) Even if it exists, this invention is applied.
Further, in this embodiment, three block iron cores are used, but any number of block iron cores (for example, the number of transfer times + 1) can be stacked.

10: laminated iron core, 11: block iron core, 12: connecting member, 13, 14: iron core piece, 16: caulking part, 17: caulking concave part, 18: caulking protrusion, 19, 20: caulking through hole, 22, 23: caulking Part, 24, 25: caulking protrusion, 30: laminated iron core, 31: iron core piece, 32: connecting member, 33: block iron core, 34: caulking part, 35: caulking protrusion, 37: caulking through hole, 40: laminated iron core, 41: iron core piece, 43: block iron core, 44: connecting member, 46: first cut and bent portion, 47: inclined portion, 48: parallel portion, 49: first space portion, 50: second cut and bent portion 51: inclined part, 52: parallel part, 53: second space part, 55, 56: iron core piece, 60: laminated iron core, 61-63: block iron core, 65, 66: iron core piece, 68: iron core piece, 69: Cutting and bending portion 70: Inclined portion, 71: Parallel portion

Claims (15)

In a laminated core formed by punching out an iron core piece from a plate-like material, laminating a plurality of the iron core pieces and connecting each iron core piece to form a block iron core, and laminating a plurality of the block iron cores,
A laminated core characterized in that connecting members that partially engage with each other are disposed between the block cores adjacent to each other in the vertical direction to prevent the laminated core from being deformed and disassembled. 2. The laminated core according to claim 1, wherein the core pieces constituting each block iron core are connected via a caulking portion. The laminated iron core according to claim 1 or 2, wherein the plate-like connecting member includes a first caulking protrusion that fits into a caulking through hole formed in an iron core piece positioned at a lowermost part of the upper block iron core. A laminated iron core comprising a second caulking projection that fits into a caulking concave portion of a caulking portion formed on an iron core piece positioned at the uppermost portion of the lower block iron core. In the laminated iron core according to claim 1 or 2, the plate-like connecting member includes a caulking through hole that fits into a caulking protrusion of a caulking portion that is formed in an iron core piece positioned at the lowest part of the upper block iron core, A laminated iron core, wherein a caulking protrusion is provided to fit in a caulking concave portion of a caulking portion formed on an iron core piece positioned at an uppermost portion of the lower block iron core. 3. The laminated core according to claim 1, wherein a second engaging portion that engages with a first engaging portion provided at a lower portion of the upper block core is provided on the upper side of the connecting member. A laminated iron core comprising a fourth engaging portion that is engaged with a third engaging portion provided on an upper portion of the lower block on a lower side of the member. 3. The laminated core according to claim 1, wherein the plate-like connecting member is fitted to a first cut and bent portion formed on an iron core piece positioned at the lowermost portion of the upper block iron core and protruding downward. A laminated core comprising: a second cut and bent portion; and a caulking protrusion that fits into a caulking concave portion of a caulking portion formed on an iron core piece positioned at an uppermost portion of the lower block iron core. 7. The laminated core according to claim 6, wherein the second cut and bent portion has an inclined portion whose one end is connected to the plate-like portion and a parallel portion whose base end is connected to the other end of the inclined portion. The laminated iron core, wherein the bent portion is tapered from the inclined portion toward the tip of the parallel portion. The laminated core according to claim 6 or 7, wherein the first and second cut and bent portions rotate the upper block core relative to the lower block core, thereby rotating the first and second block cores. A laminated iron core, wherein the second cut and bent portion is engaged. The laminated core according to any one of claims 1 to 8, wherein the connecting member is formed of a material other than the plate material. The laminated core according to any one of claims 1 to 9, wherein a diameter of the connection material is larger than a diameter of each core piece of the block core. In a laminated core formed by punching out an iron core piece from a plate-like material, laminating a plurality of the iron core pieces and connecting each iron core piece to form a block iron core, and laminating a plurality of the block iron cores,
A caulking through hole is provided at a lower position of the upper block core adjacent to the upper and lower block cores at a position different from the position of the caulking portion connecting the core pieces of the upper block core, and the lower block core A laminated iron core characterized in that a caulking projection that fits into the caulking through-hole is provided at an upper portion to prevent the laminated iron core from being deformed and disassembled. The laminated core according to any one of claims 1 to 11, wherein the block cores stacked one above the other are rolled up between the block cores. In a manufacturing method of a laminated core formed by punching out an iron core piece from a plate-like material, forming a block iron core in which a plurality of the iron core pieces are laminated, and laminating the block iron core in a plurality of stages outside a mold,
A connecting member is inserted between each of the block cores discharged from the mold, and the core piece located at the lowermost part of the block core and the connecting member are connected via the first and second engaging portions. And a step of connecting the core piece located at the uppermost part of the block core and the connecting member via third and fourth engaging portions, and each block core is formed by the connecting member. And a step of removing the connecting member when the plurality of block cores are connected and reinforced and used as the laminated core. 14. The method of manufacturing a laminated core according to claim 13, wherein each of the block cores is manufactured in a non-rolled state, and the block cores are rolled after the connecting member is removed. Manufacturing method. In a manufacturing method of a laminated core formed by punching an iron core piece from a plate-like material, forming a block iron core obtained by laminating a plurality of the iron core pieces, and laminating the block iron core in a plurality of stages in a mold,
The core piece located at the bottom of each block core has a caulking through hole at a position different from the caulking portion connecting the core pieces of the block core, and is flat on the core piece located at the top of the block core. A step of forming a plurality of the block cores having a caulking protrusion or a cut and bent portion protruding upward at the same position as the caulking through hole as viewed;
A step of discharging the plurality of block cores from the mold in a state of being connected to the caulking through hole and the caulking protrusion or the cut and bent portion in the mold. Manufacturing method of iron core.

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