JP5139903B2 - Laminated iron core and method for manufacturing the same - Google Patents

Description

The present invention relates to a laminated core mainly used for a stator or a rotor of a motor and a manufacturing method thereof, and more particularly to a laminated core that facilitates handling of a laminated core constituted by combining a plurality of divided laminated cores and the same. It relates to a manufacturing method.

Conventionally, a split core piece obtained by dividing a ring-shaped core piece into a plurality of parts in the circumferential direction is cut and formed by using a press die and by using a press die (see, for example, Patent Document 1). A laminated iron core assembled in a mold and a method for manufacturing the same have been proposed. However, in such a laminated core in which adjacent divided laminated cores are not connected, the annular form collapses even after slight force from the press mold, and the laminated cores are separated, so handling is extremely difficult. There was a problem of being troublesome.
Therefore, as described in Patent Document 2, by forming only the core pieces at the upper and lower ends of the laminated core as an integral annular core piece so that the annular form can be maintained even when subjected to external force. Measures such as doing were taken.

JP 2006-042520 A JP 2008-92770 A

However, in the technique described in Patent Document 2, since the laminated core is separated into pieces and winding is performed for each divided laminated core, the upper and lower annular core pieces must be peeled off before the winding. Since the upper and lower annular core pieces taken are discarded, the yield of the material is lowered. This is not preferable from the viewpoint of resource saving. Furthermore, since the annular core pieces are arranged on both the upper and lower ends and there is no particular starting point for peeling off, the worker takes time and effort to remove the annular core pieces. It was.

In addition, some laminated cores are annealed to remove residual strain at the time of punching, but at the time of annealing, the laminated cores are spread apart on each tray and placed on the tray. In this case, the divisional laminated iron core falls over and slips due to vibration during transportation, causing troubles such as catching in the furnace. It was also a factor to decrease.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and a laminated core that is supported only by an annular core piece arranged at the top or bottom, and that can be easily removed, and the production thereof. It aims to provide a method.

The laminated core according to the first aspect of the present invention that meets the above-mentioned object has a ring shape on either the upper end side or the lower end side of the divided laminated core in which a plurality of divided core pieces are caulked and laminated via the first caulking portion. A laminated core in which iron core pieces are caulked and laminated via a second caulking portion to prevent the divided laminated iron cores from being deformed and prevented from being divided, and the annular core pieces are arranged on the front side of the magnetic pole pieces and The yoke pieces are connected in the circumferential direction.

Here, in the laminated core according to the first aspect of the present invention, the annular core piece is formed to have an inner diameter smaller than the annularly arranged divided core pieces, and a projecting portion protruding toward the center of the annularly arranged divided laminated core is provided. Preferably it is provided.

In the laminated core according to the first aspect of the invention, the inner diameter of the annular core piece is the same as the outer diameter of the rotor core formed from the inner core piece of the annularly arranged split core piece. preferable.
In the laminated iron core according to the first invention, the caulking projection of the second caulking portion formed on the annular core piece protrudes beyond the caulking projection of the first caulking portion formed on the divided iron core piece. A small amount is preferred. Here, it is preferable that the annular core piece is caulked and joined to the divided core piece only by caulking projections formed on the yoke piece portion.

In the laminated core according to the first aspect of the present invention, the caulking allowance of the second caulking portion for laminating and connecting the annular core pieces to the divided core pieces is the same as that of the first caulking portion for laminating and connecting the divided core pieces. It is also possible to make it smaller than the caulking allowance, which makes it easy to remove the annular core piece. Specifically, reducing the caulking allowance means reducing the [area × load] at which the caulking protrusion and the caulking concave portion (which may be a caulking through hole) abut.

In the laminated iron core according to the first aspect of the invention, the first caulking portion and the second caulking portion are preferably in the same position in plan view, but the first caulking portion and the second caulking portion are the same. The two caulking portions can be provided at different positions in plan view.
In the laminated core according to the first invention, it is more preferable that the annular core piece is provided with a plurality of through holes.

The method for manufacturing a laminated core according to the second aspect of the present invention is characterized in that a plurality of divided core pieces are caulked and laminated via a first caulking portion, and the annular core piece is placed on the upper end side of the divided laminated core. A method of manufacturing a laminated iron core that has been caulked and laminated through two caulking portions with a press mold apparatus,
A first step of forming the divided laminated core by laminating a required number of the plurality of divided core pieces, which are punched out from the work plate and arranged in an annular shape, via the first caulking portion;
The second caulking portion is formed by punching the annular core piece, which is formed so as to be connected to the front side of the yoke piece portion and the magnetic pole piece portion from the work plate in the circumferential direction on the annularly arranged laminated core. And a second step of laminating via
From the press die device, the annularly arranged laminated cores arranged in an annular shape are discharged in a state of being connected and reinforced by the annular core pieces.

The method for manufacturing a laminated core according to the third aspect of the present invention is characterized in that a plurality of divided core pieces are caulked and laminated via a first caulking portion, and the annular core piece is arranged on the lower end side of the divided laminated core. Is a method of manufacturing a laminated iron core obtained by caulking and laminating via a second caulking portion with a press mold apparatus,
A first step of punching and forming the annular core piece so that the tip side of the yoke piece part and the magnetic pole piece part are connected in the circumferential direction from the work plate;
On the annular core piece, a plurality of the divided core pieces, which are punched from the work plate and arranged in an annular shape, are stacked in a necessary number via the second and first caulking portions, and the divided laminated core is provided. A second step of forming
From the press die device, the annularly arranged laminated cores arranged in an annular shape are discharged in a state of being connected and reinforced by the annular core pieces.

In the method for manufacturing a laminated core according to the second and third inventions, the annular core piece is punched so that an inner diameter is smaller than that of the annularly arranged divided core pieces, and protrudes toward the center side of the laminated core. The part is preferably formed. Here, it is preferable that the annular core piece is peeled off from the divided laminated core that is annularly arranged starting from the projecting portion formed on the annular core piece.

In the method for manufacturing a laminated core according to the second and third inventions, the inner diameter of the annular core piece is the same as the outer diameter of the rotor core formed from the inner core piece of the annularly arranged split core piece. It is good to be.

Moreover, in the manufacturing method of the laminated core according to the second and third inventions, the caulking projection of the second caulking portion formed on the annular core piece is the first caulking formed on the divided core piece. The amount of protrusion is preferably smaller than the caulking protrusion of the portion. In this case, it is preferable that the annular core piece is caulked and joined to the divided core piece only by caulking projections formed on the yoke piece portion.

Furthermore, in the manufacturing method of the laminated core according to the second and third inventions, it is more preferable that the annular core piece is provided with a plurality of through holes.

And in the manufacturing method of the laminated iron core which concerns on 2nd, 3rd invention, it is preferable that this laminated iron core discharged | emitted from the said press die apparatus is annealed in the state reinforced with the said annular iron core piece.

The method for producing the laminated core according to any one of claims 1 to 9 and the laminated core according to claims 10 to 18 have the following effects.
(1) Since the annular core piece has an integral structure in which the yoke piece portion and the tip side of the magnetic pole piece portion are connected in the circumferential direction, it is strong against external force and only on one of the upper and lower ends of the divided laminated core. Even when arranged, the annular form of the split laminated core can be maintained.

(2) Since the annular core pieces are disposed only on either one of the upper and lower sides of the laminated core, the amount of the iron core material discarded can be reduced as compared with the conventional case.
(3) Since the inner diameter (inner diameter circle) of the annular core piece is projected to the center side from the inner diameter of the annularly arranged laminated core, this projecting portion can be used as a starting point for stripping the annular core piece. The stripping workability is improved, and the annular core pieces are only one of the upper and lower parts of the divided laminated core, so that the working time is shortened.

(4) When a through-hole is provided in the annular core piece, the annular core piece is peeled off by an automatic machine (for example, an annular core piece removing device) provided with a pin that fits into the through-hole using the through-hole. It can be automated or semi-automated.
(5) Since the divided laminated cores arranged in an annular shape are reinforced by the annular core pieces, each divided laminated iron core does not fall down or slip in the furnace even when annealing is performed, and is caused by a catch in the furnace. Transport trouble can be eliminated.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 and FIG. 2 are perspective views of the laminated core according to the first embodiment of the present invention, FIG. 3 is a front sectional view thereof, and FIG. 4 is an enlarged partial sectional view thereof. FIG. 5 is an explanatory view of the method for manufacturing the laminated core, FIG. 6 is an enlarged partial cross-sectional view of the laminated core according to the second embodiment of the present invention, and FIG. 7 is a multilayer according to the third embodiment of the present invention. A front sectional view of the iron core, FIG. 8 is a partial sectional view thereof.

As shown in FIG. 1 to FIG. 4, the laminated core 10 according to the first embodiment of the present invention has a plurality of (8 in this embodiment) divided laminated cores 11 arranged in an annular shape and an annular arrangement. And an annular core piece 12 disposed at the upper end of the divided laminated core 11. These will be described in detail below.

As shown in FIGS. 2 and 4, the divided laminated iron core 11 is obtained by dividing an annular yoke part for each magnetic pole part 13, and each divided iron core piece 15, 17 is caulked and joined by a plurality of first caulked parts 14. Has been. The caulking portion 14 is formed of a rectangular through hole 16 in the lowermost divided core piece 15, and the divided core piece 17 disposed at the upper portion thereof has a V-shaped caulking projection as viewed from the lower side. It has V-shaped caulking 18.
In addition, a rectangular through-hole 19 is formed at a position different from the V-shaped caulking 18 (yoke piece portion is good) in the divided core piece 17 arranged immediately below the annular core piece 12 arranged at the top, The V-shaped caulking 20 of the annular core piece 12 placed on the upper part is caulked and joined. The V-shaped caulking 20 has a V-shaped caulking projection when viewed from the lower side.

The projecting height of the V-shaped caulking 20 is lower than the height of the V-shaped caulking 18 and smaller than the thickness of the split core piece 17, and the caulking force smaller than the caulking force of the V-shaped caulking 18 causes the annular core piece 12 to move. The split laminated iron core 11 is caulked and joined. The V-shaped caulking 20 is provided in the yoke piece portion 21 and the magnetic pole piece portion 22 of the annular core piece 12, and a corresponding through-hole 19 is provided in the uppermost divided core piece 17 of each divided laminated core 11. . As shown in FIGS. 1 and 2, the V-shaped caulking 20 can be provided only on the yoke piece portion 21, thereby facilitating separation of the annular core piece 12 in the final process.

Adjacent divided laminated cores 11 are engaged with circumferential end portions by lamination-direction uneven portions 23 (see, for example, JP-A-10-75552), and even if each divided laminated core 11 is separated, a concave portion and a convex portion are formed. It can be assembled and assembled. The concavo-convex portion 23 is formed by meshing a plurality of divided core pieces, but the divided core pieces may be alternately meshed one by one. The annular core pieces 12 are completely annular, but are connected circumferentially at the tip of the magnetic pole piece portion 22 (that is, radially inward). The annular core piece 12 is formed in a ring shape so as to have an inner diameter smaller than each of the divided core pieces 15 and 17 that are annularly arranged (that is, arranged side by side in a circumferential manner) and project toward the center side of the laminated core 11. A portion 24 is formed.

An inner diameter circle 25 formed on the center side of the annular core piece 12 is the same as the outer diameter of the rotor (rotor core) used in the laminated core 10. As a result, the mold for forming the rotor core piece can be used as it is for hollowing out the annular core piece 12. Therefore, the inner diameter of the annular core piece 12 is, for example, about 0.2 to 2 mm smaller than the inner diameter of the inner circle of the divided laminated core 11 arranged in an annular shape.

The annular core piece 12 is provided with a circular through hole 26 at a place other than the portion where the second caulking portion (V-shaped caulking 20) is formed. In this embodiment, the magnetic pole piece portions 22 are provided, but can be provided on the yoke piece portions 21. The diameter of the through hole 26 is preferably about 1/5 to 1/2 of the circumferential width of the magnetic pole piece 22, and is not provided in the divided laminated core 11.

The laminated core 10 is manufactured by using a press mold apparatus 28 as shown in FIG. 5 and punching from a work plate (magnetic steel plate) 29 having a thickness of 0.15 to 1 mm, for example, and arranged in an annular shape. The divided cores 15 and 17 are laminated in a necessary number via the caulking portion 14 to form the divided laminated core 11 that is annularly arranged. In the formation of the yoke pieces of the adjacent divided core pieces 15 and 17, they are separated by cutting and pushing back (for example, refer to Japanese Patent Application Laid-Open No. 2005-318863). In this case, the circular core piece disposed in the center of the annularly arranged split core pieces 15 and 17 is used as a rotor core piece, and the material cutting efficiency is increased. In the caulking lamination of the divided core pieces 17, the die into which the divided core pieces 15 and 17 are drawn is rotated by a predetermined angle to perform transposition and skew formation.

Next, the front side of the yoke piece portion 21 and the magnetic pole piece portion 22 is connected in the circumferential direction from the work plate 29 on the laminated divided core pieces 17 (that is, the annularly arranged divided laminated cores 11). The annular core pieces 12 formed by punching are laminated through a caulking portion (consisting of a V-shaped caulking 20 and a through hole 19). As a result, the annularly arranged divided laminated cores 11 are discharged from the press mold apparatus 28 in a state where the connection is reinforced by the annular core pieces 12. In this case, since the laminated core 10 is entirely fixed by the annular core piece 12, the shape of the annularly arranged laminated core 11 and prevention of decomposition can be prevented.

A plurality of manufactured laminated cores 10 are mounted on a pallet 31 and transferred to an annealing device 32 where they are heated to a predetermined temperature to adjust residual stress and, if necessary, crystal grains. In this case, since each laminated iron core 10 is connected and integrated by the annular core pieces 12, the laminated iron cores 10 are transported in an aligned state without being separated.

Then, the annealed laminated core 10 is transported to the annular core piece removing device 33. The removal device 33 has a diameter smaller than the inner diameter circle 34 of the annularly arranged laminated core 11 and larger than the inner diameter circle 25 of the annular core piece 12, and the total length is equal to the height of the laminated core 10, or A cylindrical portion 35 having a height that adds the thickness of the one or two annular core pieces 12 to the height of the laminated core 10, a base portion 36 that supports the cylindrical portion 35, and the through-hole 26 of the annular core piece 12. It has a pressing plate 38 having a pin 37 passing through the bottom.

In using the annular core piece removing device 33, the pressing plate is inserted in a state where the cylindrical portion 35 is inserted into the central hole of the laminated core 10 and the pin 37 is inserted into the through hole 26 from the upper part of the laminated core 10. When 38 is pressed, the annular core piece 12 is detached from the divided laminated core 11 in which the annular core piece 12 is annularly arranged with the protruding portion 24 as a starting point. As a result, the divided laminated iron cores 11 are separated, so that the magnetic pole portion 13 is wound and reassembled.

Next, the laminated core 39 according to the second embodiment of the present invention shown in FIG. 6 will be described. Differences from the laminated core 10 according to the first embodiment and the manufacturing method thereof will be described. In addition, about the component similar to the laminated core 10, the same number is attached about the same component, "a" is attached to the end of the number, and the detailed description is abbreviate | omitted. The same applies to a laminated core 40 according to a third embodiment below.

In this laminated iron core, the V-shaped caulking portion 20a constituting the second caulking portion of the annular core piece 12a provided at the uppermost portion of the laminated iron core 39 is caulked portion 14 of the divided laminated iron core 11 disposed at the lower position. It is provided at the same position in plan view. The protruding height of the V-shaped caulking 20a is smaller than the height of the protruding portion of the V-shaped caulking 18 that forms the caulking portion 14, and the annular core piece 12a is caulked to the divided laminated core 11 with a relatively small caulking force. ing.

It should be noted that the caulking force is reduced by reducing the caulking allowance between the annular core piece 12a and the divided core piece 17 in the immediately lower stage (area where the two metals abut on the caulking portion × load), thereby reducing the caulking force of the annular core piece 12a. Separation can also be facilitated. The caulking allowance can be freely set by adjusting the punch and die clearance that form the caulking. (The same applies to the first and third embodiments).

Subsequently, a laminated core 40 according to the third embodiment will be described with reference to FIGS. 7 and 8. In the laminated iron core 40, the annular iron core piece 41 is caulked and laminated on the bottom of the divided laminated iron core 42 arranged in an annular shape. That is, the diameter of the inner diameter circle 43 of the annular core piece 41 is the same as the outer diameter of the rotor core 44 taken out in the manufacturing process of the laminated core 40 and is smaller than the diameter of the magnetic pole part inner diameter circle 45 of the laminated core 40. . It is the same as the annular core piece 12 that the tip side of the yoke piece portion 46 and the magnetic pole piece portion 46a of the annular core piece 41 are connected in the circumferential direction.

A rectangular caulking through-hole 48 is provided in the lowermost segment core piece 47 of the segmented laminated core 42 arranged in an annular shape, and a V-shaped caulking 50 is formed in the segment core piece 49 disposed in the upper part thereof. Forms a first caulked portion and constitutes a laminated laminated core 42 that is caulked and laminated.
An upward V-shaped caulking 52 (constituting a second caulking portion) is formed in the annular core piece 41, and a rectangular through-hole that engages with the V-shaped caulking 52 is formed in the divided core piece 47 located immediately above the annular core piece 41. 53 is formed. The position of the through hole 53 is preferably provided in the yoke piece. The protruding height of the V-shaped caulking 52 is the same as or smaller than the thickness of the divided core piece 47, and can be separated relatively easily. The annular core piece 41 is provided with a through hole 26 used when the annular core piece 41 is separated from the divided laminated core 42.

In the production of the laminated core 40, the annular core piece 41 is punched and formed from the workpiece plate 29 so that the tip side of the yoke piece portion 46 and the magnetic pole piece portion 46 a are connected in the circumferential direction by using a press die device. Next, on the annular core piece 41, a plurality of divided core pieces 47 and 49, which are punched from the work plate 29 and arranged in an annular shape, are laminated in a necessary number via a caulking portion to form a divided laminated core 42. To do. The laminated core 40 is annealed. The removal of the annular core piece 41 is the same as that of the laminated core 10 according to the first embodiment. However, the annular core piece 41 is arranged on the upper part of the divided laminated core 42 upside down. preferable.

Although the embodiment has been described using specific numerals, it is possible to make numerical changes, dimensional changes, and shape changes without departing from the scope of the present invention.
In this embodiment, the annular core piece is protruded from the inner diameter circle on the center side of the divided laminated core arranged in an annular shape, but the present invention also applies when other portions of the annular core piece are protruded from the shape of the divided laminated core. Applies. Further, in this embodiment, the caulking portion of the annular core piece 12 is 2n when the number of magnetic pole portions is n, but may be n or 3n or more. Moreover, although the number of the caulking portions 14 of each divided iron core piece 17 is 2, it may be 3 or 4 or more. Further, although the V-shaped caulking is used for the caulking portions of the annular core piece 12 and each of the divided core pieces 15 and 17, a circular half blank caulking may be used.

1 is a perspective view of a laminated iron core according to a first embodiment of the present invention. It is a disassembled perspective view of the laminated iron core which concerns on the 1st Embodiment of this invention. FIG. It is the same expanded partial sectional view. It is explanatory drawing of the manufacturing method of the laminated core. It is an expanded partial sectional view of the laminated iron core which concerns on the 2nd Embodiment of this invention. It is a front sectional view of the laminated iron core according to the third embodiment of the present invention. It is the same fragmentary sectional view.

Explanation of symbols

10: laminated iron core, 11: divided iron core, 12, 12a: annular core piece, 13: magnetic pole part, 14: first caulking part, 15: divided iron core piece, 16: through hole, 17: divided iron core piece, 18 : V-shaped caulking, 19: Through hole, 20, 20a: V-shaped caulking, 21: Yoke piece, 22: Magnetic pole piece, 23: Concavity and convexity in the stacking direction, 24: Projection, 25: Inner diameter circle, 26: Through Hole: 28: Press die device, 29: Work plate, 31: Pallet, 32: Annealing device, 33: Removal device of annular core piece, 34: Inner diameter circle, 35: Cylindrical portion, 36: Base portion, 37: Pin: 38: Presser plate, 39: Laminated iron core, 40: Laminated iron core, 41: Ring iron core piece, 42: Divided laminated iron core, 43: Inner diameter circle, 44: Rotor iron core, 45: Inner diameter circle of magnetic pole part, 46: Yoke One piece, 46a: magnetic pole piece, 47: divided core piece, 48: caulking penetration Hole, 49: segment core piece, 50: V-shaped caulking, 52: V-shaped caulking, 53: through-hole

Claims (18)

A plurality of divided iron core pieces are caulked and laminated via a first caulking portion, and an annular iron core piece is caulked and laminated via a second caulking portion on one of the upper end side and the lower end side of the divided laminated iron core. In addition, a laminated iron core designed to prevent the shape and shape of the divided laminated iron core arranged annularly,
The laminated core is characterized in that the annular core piece has a tip side of a magnetic pole piece and a yoke piece connected in a circumferential direction. 2. The laminated core according to claim 1, wherein the annular core piece is formed to have an inner diameter smaller than the annularly arranged divided core pieces, and a projecting portion is provided to protrude toward the center of the annularly arranged laminated core. A laminated iron core characterized by that. 3. The laminated core according to claim 1, wherein an inner diameter of the annular core piece is the same as an outer diameter of a rotor core formed of an inner core piece of the annularly arranged split core pieces. A laminated iron core characterized by being. The laminated iron core according to any one of claims 1 to 3, wherein the caulking protrusion of the second caulking portion formed on the annular iron core piece is caulking of the first caulking portion formed on the divided iron core piece. A laminated iron core characterized in that the amount of protrusion is smaller than the protrusion. The laminated core according to any one of claims 1 to 4, wherein a caulking allowance of the second caulking portion that laminates and connects the annular core pieces to the divided core pieces is the first that connects the divided core pieces in a stacked manner. A laminated iron core characterized by being smaller than a caulking allowance of 1 caulking portion. The laminated core according to any one of claims 1 to 5, wherein the first caulking portion and the second caulking portion are in the same position in plan view. The laminated core according to any one of claims 1 to 5, wherein the first caulking portion and the second caulking portion are in different positions in plan view. 5. The laminated core according to claim 1, wherein the annular core piece is caulked and joined to the divided core piece only by caulking protrusions formed on the yoke piece portion. 6. The laminated core according to any one of claims 1 to 8, wherein the annular core piece is provided with a plurality of through holes. A press mold apparatus having a laminated core in which a plurality of divided core pieces are caulked and laminated via a first caulking portion and an annular core piece is caulked and laminated via a second caulking portion on the upper end side of the divided laminated core. A method of manufacturing with
A first step of forming the divided laminated core by laminating a required number of the plurality of divided core pieces, which are punched out from the work plate and arranged in an annular shape, via the first caulking portion;
The second caulking portion is formed by punching the annular core piece, which is formed so as to be connected to the front side of the yoke piece portion and the magnetic pole piece portion from the work plate in the circumferential direction on the annularly arranged laminated core. And a second step of laminating via
A method of manufacturing a laminated core, wherein the divided laminated cores arranged annularly are discharged from the press mold apparatus in a state of being connected and reinforced with the annular core pieces. Press die apparatus having a laminated core obtained by caulking and laminating a plurality of divided iron core pieces via a first caulking portion and caulking and laminating the lower laminated iron core via a second caulking portion. A method of manufacturing with
A first step of punching and forming the annular core piece so that the tip side of the yoke piece part and the magnetic pole piece part are connected in the circumferential direction from the work plate;
On the annular core piece, a plurality of the divided core pieces, which are punched from the work plate and arranged in an annular shape, are stacked in a necessary number via the second and first caulking portions, and the divided laminated core is provided. A second step of forming
A method of manufacturing a laminated core, wherein the divided laminated cores arranged annularly are discharged from the press mold apparatus in a state of being connected and reinforced with the annular core pieces. 12. The method of manufacturing a laminated core according to claim 10, wherein the annular core piece is stamped so that an inner diameter is smaller than the annularly arranged divided core pieces and protrudes toward a center side of the laminated core. The manufacturing method of the laminated iron core characterized by forming the protrusion part to perform. 13. The method of manufacturing a laminated core according to claim 12, wherein the annular core piece is peeled off from the divided laminated core that is annularly arranged starting from the protrusion formed on the annular core piece. Method. The method of manufacturing a laminated core according to any one of claims 10 to 13, wherein an inner diameter of the annular core piece is an outer diameter of a rotor core formed from an inner core piece of the annularly arranged split core pieces. A method for producing a laminated iron core, characterized in that 15. The method of manufacturing a laminated core according to any one of claims 10 to 14, wherein the caulking protrusion of the second caulking portion formed on the annular core piece is the first caulking formed on the divided core piece. A method of manufacturing a laminated iron core characterized in that the amount of protrusion is smaller than the caulking protrusion of the portion. 16. The method of manufacturing a laminated core according to claim 15, wherein the annular core piece is caulked and joined to the divided core piece only by caulking protrusions formed on the yoke piece portion. The method for manufacturing a laminated core according to any one of claims 10 to 16, wherein the annular core piece is provided with a plurality of through holes. 12. The method of manufacturing a laminated core according to claim 10, wherein the laminated core discharged from the press mold apparatus is annealed while being reinforced by the annular core piece. Manufacturing method of laminated iron core.

Images