JP2008092770A - Laminated core and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated core that has large mechanical strength, can be discharged from a press molding device without any troubles, and also prevents its shape from being collapsed in handling, and to provide a method of manufacturing the laminated core. <P>SOLUTION: By using this method, the press molding device manufactures the laminated core 10, where lower- and upper-side annular core pieces 16, 17 are subjected to caulking lamination at lower and upper sides of a divided laminated core 14 in which a plurality of divided core pieces 11, 12 are subjected to caulking lamination for annular arrangement. The method includes: a first process for punching the lower-side annular core piece 16 from a plate 29 to be machined; a second process for performing caulking lamination to a desired number of the divided core pieces 11, 12 punched from the plate 29 to be machined and arranged annularly to the lower-side annular core piece 16 via a caulking section 13; and a third process for performing caulking lamination to the upper-side annular core piece 17 punched from the plate 29 to be machined to the divided laminated core 14 annularly arranged in the second process via the caulking section 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a laminated core obtained by caulking and laminating a lower annular core piece and an upper annular core piece respectively on a lower end side and an upper end side of a divided laminated core in which a plurality of divided core pieces are caulked and arranged in an annular manner, and a method for manufacturing the same. .

Conventionally, when manufacturing a laminated core, for example, a stator laminated core, the yoke of the core piece is divided for each magnetic pole in order to wind the winding around the magnetic pole of the stator laminated core with good workability and densely. A winding is wound around the magnetic poles of a divided laminated core obtained by punching and forming as a divided iron core piece and caulking and laminating via a caulking portion.
Here, in the manufacturing method of the stator laminated core consisting of the divided core pieces, the laminated core pieces formed by punching the divided core pieces by connecting them in a strip shape by a press mold apparatus are stacked, and the laminated strip cores are further separated. There is a method of manufacturing a stator laminated iron core by forming and connecting in an annular shape with a forming apparatus. In addition to this, as shown in FIG. 6, a plurality of divided core pieces arranged in an annular shape are punched from the metal plate 103 by the outer punch 102 of the press die apparatus 101, and the punch hole 105 is formed in the die plate 104. There is a method of manufacturing the stator laminated core 100 in which the divided laminated cores 106 are arranged in an annular shape by sequentially caulking and stacking them while pulling them into (see, for example, Patent Document 1).

JP-A-8-182231

However, in the invention described in Patent Document 1, the stator laminated iron core in an annularly connected state can be manufactured by a press mold apparatus, but when a plurality of stator laminated iron cores are discharged from the press mold apparatus, It may fall over or deform and become entangled, making it impossible to discharge. In particular, when a biased external force is applied when the stator laminated iron core 100 is discharged from the press mold apparatus 101 onto the discharge table 108 or handled on the discharge table 108 by the pusher 107, the shape of the stator laminated iron core 100 is increased. In such a case, there is a problem that the stator laminated core 100 is decomposed into the divided laminated core 106 in a severe case.

The present invention has been made in view of such circumstances, and in manufacturing a laminated core composed of split laminated cores arranged annularly in a press mold apparatus, the mechanical strength is strong and discharge from the press mold apparatus can be performed without any trouble. It is another object of the present invention to provide a laminated iron core that does not lose its shape during handling and a method for manufacturing the same.

The laminated core according to the first invention that meets the above-mentioned object includes a lower annular core piece and a lower annular core piece respectively arranged on a lower end side and an upper end side of a divided laminated core in which a plurality of divided core pieces are caulked and laminated via caulking portions. The upper annular core pieces are caulked and laminated to prevent the split laminated cores arranged in an annular shape from being deformed and prevented from being disassembled.

The method for manufacturing a laminated core according to the second aspect of the present invention is characterized in that a lower annular core piece and an upper annular piece are respectively provided at a lower end side and an upper end side of a divided laminated core obtained by caulking and laminating a plurality of divided core pieces. A method of manufacturing a laminated iron core obtained by caulking and laminating iron core pieces with a press mold apparatus,
A first step of punching and forming the lower annular core piece from a work plate;
A second step of caulking and laminating a desired number of the divided core pieces, which are punched out of the workpiece plate and arranged annularly, on the lower annular core piece via caulking portions;
A third step of caulking and laminating the upper annular core piece formed by punching from the workpiece plate on the split laminated core disposed in the second step via a caulking portion;
From the press mold apparatus, the annularly arranged laminated cores are discharged in a state where the upper and lower annular core pieces are connected and reinforced by the upper and lower annular core pieces.

In the method for manufacturing a laminated core according to the second aspect of the invention, the lower annular core piece is annularly arranged at an upper portion thereof using a caulking portion formed at a position different from the caulking portion for caulking the divided iron core piece. The divided iron core piece is caulked and joined, and the caulked portion formed in the lower annular core piece can be formed from a through hole.

In the laminated core according to claim 1 and the method for producing the laminated core according to claims 2 and 3, the lower annular core piece and the upper annular core piece respectively present on the lower end side and the upper end side of the annularly arranged divided laminated cores are used. The connection strength as a laminated iron core is enhanced, and even if the laminated iron cores are pressed against each other or fall down when discharged from the press mold apparatus, the laminated iron core can be smoothly discharged without being deformed. In addition, even if an unexpected external force is applied during handling after discharge, the upper and lower annular core pieces prevent deformation and deformation, making it easy to handle the laminated core and manufacturing the laminated core. Yield can be improved.

In particular, in the method for manufacturing a laminated core according to claim 3, the lower annular core piece is annularly arranged on the upper portion thereof using a caulking portion formed at a position different from the caulking portion for caulking the divided iron core piece. Therefore, the external force when removing the lower annular core piece does not act directly on the caulked portion that caulks the divided core piece, and the shape of the annular laminated core is not adversely affected. Can be removed.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is an explanatory view of the laminated core according to the first embodiment of the present invention, FIG. 2 is an explanatory view showing a laminated state of the laminated core, and FIG. 3 is a process explanatory view in the manufacturing method of the laminated core. FIG. 4 is an explanatory view showing a laminated state of the laminated core according to the second embodiment of the present invention, and FIG. 5 is a process explanatory view in the method for producing the laminated core.

As shown in FIGS. 1 and 2, a stator laminated core 10, which is an example of a laminated core according to the first embodiment of the present invention, includes a plurality of divided core pieces 11 and 12 that are arranged in a ring shape. A lower annular core piece 16 and an upper annular core piece 17 are caulked and laminated on a lower end side and an upper end side of a stator laminated core body 15 comprising split laminated cores 14 that are caulked and arranged in an annular manner through 13. . This will be described in detail below.

The divided core piece 11 is obtained by dividing the yoke 26 for each divided magnetic pole (one magnetic pole), and has a divided yoke piece 18 and a divided magnetic pole piece 19, and the divided yoke piece 18 and the divided magnetic pole piece 19. Each is formed with a caulking portion 13 including a caulking protrusion 20 protruding downward and a caulking hole 21 formed on the upper side thereof. Similarly to the divided core piece 11, the divided core piece 12 is obtained by dividing the yoke 26 for each divided magnetic pole, and has a divided yoke piece portion 22 and a divided magnetic pole piece portion 19. Each of the magnetic pole piece portions 19 is formed with a caulking protrusion 20 that protrudes downward and can be fitted into the caulking hole 21 and a caulking portion 13 that is formed on the upper side thereof.
Note that the divided yoke piece portion 22 is different in shape on both end sides from the divided yoke piece portion 18. As a result, a plurality of divided core pieces 11 and 12 arranged in an annular shape are caulked and laminated in sequence by a desired number of pieces via a caulking portion 13, thereby forming a divided laminated core 14 having concavo-convex portions at both ends and the concavo-convex portions. The adjacent laminated laminated cores 14 are connected to each other through the stator laminated core core body 15 including the annular laminated divided laminated cores 14. Here, in the divided laminated core 14, the divided yoke 24 is formed by the lamination of the divided yoke pieces 18 and 22, and the divided magnetic pole is formed by the lamination of the divided magnetic pole piece 19. The yoke 26 of the child laminated core body 15 is formed with the magnetic pole 27 of the stator laminated core body 15 from a plurality of divided magnetic poles.

Here, as shown in FIG. 2, the lower annular core piece 16 is formed with a caulking portion 28 formed of a through hole into which the caulking protrusion 20 formed in the divided core piece 11 can be fitted. As a result, the split core piece 11 arranged in a ring shape can be caulked and joined to the upper part of the lower annular core piece 16, and the plurality of split core pieces 12, 11 arranged in a ring shape thereon can be further caulked. The stator laminated core main body 15 is formed on the upper portion of the lower annular core piece 16 by alternately caulking and laminating every two sheets. In addition, the caulking lamination | stacking of the division | segmentation iron core pieces 12 and 11 can be caulking lamination | stacking alternately for every desired number of sheets instead of every 2 sheets.
The upper annular core piece 17 is formed with a caulking portion 13 including a caulking protrusion 20 that can be fitted into a caulking hole 21 formed in the split core piece 12 at the uppermost stage of the stator laminated core body 15. As a result, the upper annular core piece 17 can be caulked and laminated on the stator laminated core body 15 via the caulking portion 13. As a result, the stator laminated core 10 in which the lower annular core piece 16 and the upper annular core piece 17 are caulked and laminated on the lower end side and the upper end side of the stator laminated core body 15 is formed. In the stator laminated core 10, there are upper and lower annular core pieces 16, 17 at the upper and lower ends of the stator laminated core body 15, respectively, and therefore an external force biased when handling the stator laminated core 10. Even if it is applied, it is possible to prevent the stator laminated core body 15 from being deformed, deformed, and further decomposed.

Then, the manufacturing method of the stator laminated core 10 which concerns on the 1st Embodiment of this invention is demonstrated.
As shown in FIG. 3, a press die apparatus (not shown) applied to the method for manufacturing the stator laminated core 10 according to the first embodiment of the present invention is a belt-like thin film as an example of a plate to be processed. In the steel plate 29, a conveying guide hole (pilot hole) 30 is formed, a station A for forming the rotor hole 31, a station B for removing the slot 32, and a connecting portion 32a for connecting the slot 32 and the rotor hole 31 are punched. Station C,
Station D for forming a predetermined number of cuts 33 in the formation area of the divided yoke piece portion 18 of the divided core piece 11, and a predetermined number of cuts 34 (opposite to the cut 33) in the formation area of the divided yoke piece portion 22 of the divided core piece 12. Direction E), station F which forms the caulking portion 28 made of a through hole in the lower annular core piece 16, station G which forms the caulking portion 13 in the divided core pieces 11, 12 and the upper annular core piece 17, A station H is provided for performing outline extraction and caulking lamination. Here, by forming the transport guide hole 30 in the strip-shaped thin steel plate 29, the strip-shaped thin steel plate 29 can be intermittently moved in units of one pitch distance of the transport guide hole 30. Stations B to H Is provided with a gap corresponding to a feed distance of 1 pitch, the lower annular core piece 16, the divided core pieces 11, 12, and the upper annular core piece 17 can be accurately formed and caulked and laminated accurately. it can.

First, in order to punch and form the lower annular core piece 16 which is the lowermost layer, in the station A, the conveyance guide holes 30 are formed on both sides in the width direction of the strip-shaped thin steel sheet 29, and the rotor hole 31 is formed in the center. Form station B
, A predetermined number of slots 32 are punched around the rotor hole 31, and at station C, a connecting portion 32 a connecting the slot 32 and the rotor hole 31 is punched out, and the rotor hole 31 is centered. A number of divided magnetic pole piece portions 19 are formed. Then, the stations D and E pass the strip-shaped thin steel plate 29 as a play station, and the station F forms the caulking portion 28. Subsequently, the station G passes the strip-shaped thin steel plate 29 as a play station, cuts the outer shape at the station H, and pulls the lower annular core piece 16 into a punching hole (not shown) (the first step). .

Then, the divided core pieces 11 and 12 are punched and laminated on the lower annular core piece 16 up to a desired stacking thickness (alternately every two sheets in this embodiment). This will be described below.
At the station A, the conveying guide hole 30 and the rotor hole 31 are formed in the strip-shaped thin steel plate 29, and a predetermined number of slots 32 are punched around the rotor hole 31 at the station B. The connecting portion 32a connecting the rotor hole 31 and the rotor hole 31 is punched, and a predetermined number of divided magnetic pole piece portions 19 are formed around the rotor hole 31. In the station D, when the divided iron core piece 11 is formed, a notch 33 is formed in the formation area of the divided yoke piece 18, and the belt-like thin steel plate 29 is passed through the stations E and F as play stations, and the caulked portion 13 is formed in the station G. Form. Further, the outer shape is removed at the station H, and a plurality of divided core pieces 11 arranged in an annular shape are placed on the lower annular core piece 16 accommodated in the punching hole, and the lower annular core piece 16 is placed. The caulking lamination is performed by fitting the caulking projections 20 of the caulking portion 13 formed in the divided core piece 11 into the through holes of the caulking portion 28 formed in the above.

When forming the split core pieces 12, the guide holes 30 and the rotor holes 31 are formed in the strip-shaped thin steel plate 29 at the station A, and the slots 32 around the rotor holes 31 are formed at the station B in the same manner as described above. And the connecting portion 32a connecting the slot 32 and the rotor hole 31 is punched at the station C to form the divided magnetic pole piece portion 19. Further, the station D passes the strip-shaped steel sheet 29 as a play station and forms a notch 34 in the split core piece 12 at the station E, and the station F passes the strip-shaped thin steel sheet 29 as a play station and the caulking portion 13 at the station G Form. Subsequently, the outer shape is extracted at the station H, and the plurality of divided core pieces 12 arranged in an annular shape are placed on the plurality of divided core pieces 11 arranged in an annular shape accommodated in the punching holes, and The caulking projections 20 of the divided core pieces 12 are fitted into the caulking holes 21 of the divided core pieces 11 to perform caulking lamination. In this way, in this embodiment, the desired number of the split core pieces 11 and 12 are alternately laminated on the lower annular core piece 16 to form an annular arrangement on the lower annular core piece 16. A stator laminated core body 15 composed of the divided laminated iron cores 14 is formed (the second step).

When the stator laminated core body 15 is formed on the upper part of the lower annular core piece 16, the conveyance guide hole 30 and the rotor hole 31 are formed in the strip-shaped thin steel sheet 29 at the station A, and the rotor is used at the station B. The slot 32 is punched around the hole 31, the connecting portion 32a connecting the slot 32 and the rotor hole 31 is punched at the station C, the strip steel plate 29 is passed through the stations D to F as play stations, and the station G is caulked. Part 13 is formed. Next, the outer shape is removed at the station H to form the upper annular core piece 17, which is placed on the stator laminated core body 15 in the punching hole and the caulking portion 13 formed on the upper annular core piece 17 is caulked. The protrusion 20 is inserted into the caulking hole 21 of the caulking portion 13 formed in the uppermost divided core piece (the divided core piece 12 in FIG. 2) of the stator laminated core body 15 to be caulked and laminated (the third step). . As a result, the stator laminated core 10 in which the upper and lower annular core pieces 16 and 17 are caulked to the upper and lower ends of the stator laminated core body 15 is formed in the punched hole.
The above description mainly describes how the iron core piece punched at the station H is manufactured. However, in practice, when the lower annular core piece 16 is punched at the station H, the process continues. A plurality of divided core pieces 11 and 12 arranged in an annular shape are alternately punched to the desired stack thickness for each desired number of pieces, and finally the upper annular core piece 17 is punched and formed.

The obtained stator laminated core 10 is discharged from the press mold apparatus using a discharge means (not shown). Since the connection strength as the stator laminated core 10 is enhanced by the lower annular core pieces 17 and 16 provided above and below the stator laminated core 10, the stator laminated cores 10 are arranged at the time of discharging from the press mold apparatus. Even if they are pressed against each other or fall down, the stator laminated core 10 can be smoothly discharged without losing its shape. Further, even if an unexpected external force is applied during handling after discharging, the upper and lower annular core pieces 17 and 16 are prevented from being deformed or deformed, and the stator laminated core 10 can be easily handled. In use of the stator laminated core 10, the upper and lower annular core pieces 17 and 16 are removed, and the stator laminated core body 15 is taken out.

Next, a stator laminated core 35 that is an example of the laminated core according to the second embodiment of the present invention will be described.
As shown in FIG. 4, the stator laminated core 35 according to the second embodiment is divided on the lower annular core piece 36 as compared with the stator laminated core 10 according to the first embodiment. The connecting divided core pieces 37 that are examples of the core pieces are caulked and laminated, and the divided core pieces 11 and 12 are caulked and laminated alternately on the divided core pieces 37 for each desired number of pieces via the caulking portion 13. Is a feature. For this reason, only the feature points will be described, and the same constituent members will be denoted by the same reference numerals and detailed description thereof will be omitted.

The connecting divided core piece 37 includes a divided yoke piece portion 22 and a divided magnetic pole piece portion 19, and the divided yoke piece portion 22 and the divided magnetic pole piece portion 19 each have a caulking portion 28 including a through hole, and a caulking portion. A caulking portion 39 made of a caulking projection that protrudes downward is provided at a position different from that of 28. Further, the lower annular core piece 36 is provided with a caulking portion 41 including a through hole into which a caulking projection formed on the connecting divided core piece 37 can be fitted. As a result, the split core piece 37 for connection can be caulked and joined to the lower annular core piece 36 via the caulking projection of the caulking portion 39 and the through hole of the caulking portion 41. Further, a plurality of divided core pieces 12, 11 arranged in a ring shape can be caulked and stacked via the caulking portion 13 on the connecting divided core pieces 37 arranged in an annular shape, and the lower annular core piece 36 can be laminated. A stator laminated core main body 43 is formed on the upper part. In using the stator laminated core 35, the upper and lower annular core pieces 17 and 36 are removed, and the stator laminated core body 43 is taken out.

Then, the manufacturing method of the stator laminated core 35 which concerns on the 2nd Embodiment of this invention is demonstrated.
The press die apparatus (not shown) applied to the method for manufacturing the stator laminated core 35 according to the second embodiment of the present invention is a method for manufacturing the stator laminated core 10 according to the first embodiment. As shown in FIG. 5, between the station E and the station F of the press mold apparatus applied to the station I is connected to the downstream side of the station I and the station I forming the caulking portion 41 made of a through hole in the strip-shaped thin steel plate 29. Station J for forming the caulking portion 39 as a caulking projection is provided on the split core piece 37 for use, and the split core piece 37 arranged annularly on the lower annular core piece 36 extracted from the outer shape at the station H is caulked. The caulking protrusions 39 are inserted into the through holes as the caulking portions 41 of the lower annular core piece 36 and are caulked and stacked (first step), and a plurality of divided core pieces 11 arranged annularly thereon are further provided. 12 It via the caulking portion 13 by caulking laminated to the desired loading thickness alternately by a desired number to form a stator laminated core body 43 (second step) is a feature. Therefore, only the first and second steps will be described.

First, in order to punch and form the lower annular core piece 36 which is the lowermost layer, in the station A, the conveyance guide holes 30 are formed on both sides in the width direction of the strip-shaped thin steel sheet 29, and the rotor hole 31 is formed in the center. Form station B
2, a predetermined number of slots 32 are punched around the rotor hole 31, and a connecting portion 32 a connecting the slot 32 and the rotor hole 31 is punched at the station C, and a predetermined number of divided magnetic poles centering on the rotor hole 31. A piece 19 is formed. Then, using the stations D to E as a play station, the belt-shaped thin steel plate 29 is allowed to pass, and at the station I, a caulking portion 41 including a through hole is formed. Subsequently, the strip-shaped thin steel plate 29 is passed through the stations J, F, and G as play stations, the outer shape is cut out at the station H, and the formed lower annular core piece 36 is drawn into a punching hole (not shown). (The above is the first step).

Next, punching formation of the connecting split core pieces 37 and lamination on the lower annular core pieces 36 will be described.
At the station A, the conveying guide hole 30 and the rotor hole 31 are formed in the strip-shaped thin steel plate 29, the slot 32 is punched at the station B, and the connecting portion 32a connecting the slot 32 and the rotor hole 31 is punched and divided at the station C. The pole piece portion 19 is formed. Next, the strip D is passed through the station D with the station D as a play station and the notch 34 is formed at the station E. The station I passes the strip thin steel plate 29 as the play station, and the caulking portion 39 is used as the caulking projection at the station J. Then, a through hole is formed as a caulking portion 28 at the station F. Then, the strip-shaped steel sheet 29 is passed through the station G as a play station, the plurality of divided core pieces 37 are punched out from the outer shape at the station H, and the lower annular core accommodated in the punched hole is punched out. While being placed on the piece 36, the caulking lamination of the caulking portion 39 formed in the divided core piece 37 is inserted into the through hole of the caulking portion 41 formed in the lower annular core piece 36 to perform the caulking lamination.

Further, the divided core pieces 11 and 12 are alternately punched and laminated to the desired stack thickness above the connecting divided core pieces 37. Since this lamination is the same as that of the first embodiment, it will be described briefly.
At the station A, the conveying guide hole 30 and the rotor hole 31 are formed in the strip-shaped thin steel plate 29, the slot 32 is punched at the station B, and the connecting portion 32a connecting the slot 32 and the rotor hole 31 is punched and divided at the station C. The pole piece portion 19 is formed. Next, the notch 33 is formed at the station D, the strip-shaped steel plate 29 is passed through the stations E, I, J, and F as play stations, and the caulking portion 13 is formed at the station G. Subsequently, the plurality of divided core pieces 11 which are extracted in an annular shape at the station H and placed in an annular shape are placed on the connecting divided core pieces 37 accommodated in the punching holes, and the divided core pieces 11 are arranged. The caulking projections 20 are fitted into the caulking portions 28 of the divided iron core pieces 37 to perform caulking lamination. Then, the desired number of divided core pieces 12 are sequentially caulked and laminated on the desired number of divided core pieces 11, and the divided core pieces 11, 12 are alternately laminated to the desired stacking thickness, on the lower annular core piece 36. A stator laminated core main body 43 composed of a plurality of divided core pieces 37 and divided core pieces 11 and 12 arranged in an annular shape is formed (the second step).

In using the obtained stator laminated core 35, the upper and lower annular core pieces 17, 36 are removed, and the stator laminated core body 43 is taken out and used. Here, the caulking portions 39 and 41 that connect the lower annular core piece 36 and the divided core pieces 37 are the caulking portions 13 that connect the divided core pieces 37 and the divided core pieces 11 and 12 for connection. Since they are provided at different positions, an external force when removing the lower annular core piece 36 from the stator laminated core 35 can be taken out without directly acting on the caulking portion 13.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
For example, in the present embodiment, the case of the stator laminated core has been described, but the present invention can also be applied to the case of a rotor laminated core.
In the method for manufacturing a laminated core according to the second embodiment, the stations I and J are provided between the station E and the station F of the press die apparatus. Station I and station J can be arranged at arbitrary positions.

It is explanatory drawing of the laminated core which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows the lamination | stacking state of the same laminated iron core. It is process explanatory drawing in the manufacturing method of the same laminated iron core. It is explanatory drawing which shows the lamination | stacking state of the laminated iron core which concerns on the 2nd Embodiment of this invention. It is process explanatory drawing in the manufacturing method of the same laminated iron core. It is explanatory drawing which shows the manufacturing method of the laminated core which concerns on a prior art example.

Explanation of symbols

10: Stator laminated core, 11, 12: Split core piece, 13: Caulking part, 14: Split laminated core, 15: Stator laminated core body, 16: Lower annular core piece, 17: Upper annular core piece, 18 : Divided yoke piece part, 19: divided magnetic pole piece part, 20: caulking projection, 21: caulking hole, 22: divided yoke piece part, 24: divided yoke part, 26: yoke, 27: magnetic pole, 28: caulking part, 29: Strip steel sheet, 30: conveying guide hole, 31: rotor hole, 32: slot, 32a: connecting portion, 33, 34: notch, 35: stator laminated core, 36: lower annular core piece, 37: Split core pieces for connection, 39: caulking part, 41: caulking part, 43: stator laminated core body

Claims (3)

The above-mentioned division in which a plurality of divided iron core pieces are caulked and laminated via caulking portions, and a lower annular core piece and an upper annular core piece are caulked and laminated respectively on the lower end side and upper end side of the divided laminated iron core. A laminated iron core characterized by preventing the laminated iron core from being deformed and disassembled. A method of manufacturing a laminated core obtained by caulking and laminating a lower annular core piece and an upper annular core piece on a lower end side and an upper end side of a divided laminated core in which a plurality of divided iron core pieces are caulked and arranged annularly, respectively, by a press mold apparatus Because
A first step of punching and forming the lower annular core piece from a work plate;
A second step of caulking and laminating a desired number of the divided core pieces, which are punched out of the workpiece plate and arranged annularly, on the lower annular core piece via caulking portions;
A third step of caulking and laminating the upper annular core piece formed by punching from the workpiece plate on the split laminated core disposed in the second step via a caulking portion;
A method of manufacturing a laminated core, wherein the divided laminated cores arranged annularly are discharged from the press mold apparatus in a state where the upper and lower annular core pieces are connected and reinforced by the upper and lower annular core pieces. 3. The method of manufacturing a laminated core according to claim 2, wherein the lower annular core piece is annularly arranged at an upper portion thereof using a caulking portion formed at a position different from the caulking portion for caulking the divided iron core piece. A method of manufacturing a laminated core, wherein the divided core pieces are caulked and joined, and the caulked portion formed in the lower annular core piece is formed from a through hole.

Images