JP2015080412A5 - - Google Patents

Description

Manufacturing method of laminated iron core

The present invention relates to a method of manufacturing a laminated core for a stator formed by laminating annular core pieces.

Conventionally, a laminated core for a stator (hereinafter also simply referred to as a stator core) is formed by laminating annular core pieces punched from a thin plate material. In addition, in the manufacturing method of the laminated core, there is a method of punching and forming an annular core piece from a thin plate material, but in order to facilitate winding work to each magnetic pole part, a plurality of parts separated in the circumferential direction are provided. There is also a method of punching and forming the divided core pieces in the same manner as the annular core piece (circumferentially integrated type) core piece (for example, see Patent Document 1).

JP 2005-318863 A

However, a general stator iron core has an opening between the tip portions of magnetic pole portions adjacent in the circumferential direction, and has a shape that is easily deformed. For this reason, as shown below, deformation occurred in the manufacturing process of the laminated core.

For example, if the inner shape of the tip of the magnetic pole piece is removed from the thin plate material, the rigidity of the tip of the magnetic pole piece decreases, so when the thin plate material is sent to the next processing location, Fluctuation (swaying in the thickness direction) occurred, and the magnetic pole piece was caught by the opening edge of the die and the stator core being rolled, causing deformation.

In particular, if the punching speed is increased, the fluttering in the thickness direction of the tip of the magnetic pole piece formed will also increase, making the deformation more likely to occur, and the thickness of the thin plate material is thin and the product has a large outer shape As shown, the frequency of deformation increased.
Furthermore, when performing welding, molding, or the like on the stator core, the stator core is attached to the processing device, but when attaching to or detaching from the processing device, the tip of the magnetic pole portion is used as a guide. The tip of one part was deformed.
The above-described deformation is likely to occur when a laminated core is manufactured by stacking a plurality of divided core pieces.

The present invention has been made in view of such circumstances, and can prevent the deformation of the tip of the magnetic pole piece of the iron core piece, eliminate the interruption of production due to product failure, and efficiently manufacture a product of good quality. It aims at providing the manufacturing method of a laminated iron core.

The method for manufacturing a laminated core according to the first invention that meets the above-mentioned object is a method for producing a laminated core for a stator that is formed by laminating and forming annular core pieces punched from a thin plate material.
Slotting step of punching a preset number of slots in the thin plate material to form a contour excluding the front side of each magnetic pole piece part;
A bending process in which each of the magnetic pole piece portions is bent at a specific location in the radial direction, and a ring-shaped connecting member for connecting the tip side of each of the magnetic pole piece portions is partially sheared and separated from each of the magnetic pole piece portions;
A pushback step in which the bent portion of the thin plate material is pushed back to form the same surface as the thin plate material, and the front side of each of the magnetic pole piece portions is brought into contact with the peripheral edge of the separated connection member;
The outer shape of the iron core piece is punched together with the connecting member, and the iron core piece whose tip side of the magnetic pole piece abuts on the ring-shaped connecting member is stacked on the lower core piece and the connecting member formed by punching first. and a contour punching laminating step of.

The method for manufacturing a laminated core according to the second invention that meets the above-mentioned object is a method for producing a laminated core for a stator that is formed by laminating and forming annular core pieces punched from a thin plate material.
Slotting step of punching a preset number of slots in the thin plate material to form a contour excluding the front side of each magnetic pole piece part;
A separation step of partially shearing and separating the ring-shaped connecting member for connecting the front side of each magnetic pole piece part from each magnetic pole piece part;
A pushback step in which the connecting member is pushed back to form the same material as the thin plate material, and the front side of each magnetic pole piece is brought into contact with the peripheral edge of the separated connecting member;
The outer shape of the iron core piece is punched together with the connecting member, and the iron core piece whose tip side of the magnetic pole piece abuts on the ring-shaped connecting member is stacked on the lower core piece and the connecting member formed by punching first. and a contour punching laminating step of.

In the method for manufacturing a laminated core according to the first and second inventions, an outer peripheral edge of the connecting member in the pushback step is in contact with a radially inner side of the magnetic pole piece, and an inner peripheral contour of the connecting member is It should be circular.
In the method for manufacturing a laminated core according to the first and second inventions, the thin plate material may be previously punched and removed from the rotor.
In the method for manufacturing a laminated core according to the first and second inventions, in the previous step of the slot removing step, the annular yoke piece portion that connects the magnetic pole piece portions at the base portion is cut and separated at the position of each slot. You can also

In the method for manufacturing a laminated core according to the present invention, after the ring-shaped connecting member is partially sheared and separated from each magnetic pole piece, the magnetic pole piece side or the connecting member side is pushed back, Side is in contact with the peripheral edge of a ring-shaped connecting member separated from each magnetic pole piece, so that flapping on the front side of the magnetic pole piece after punching can be prevented, and the tip of the magnetic pole piece adjacent to the circumferential direction The thin plate material can be conveyed in a state where the opening between the parts is eliminated. Thereby, for example, when the thin plate material is sent to the next punching place, the deformation of the magnetic pole piece due to the magnetic pole piece being caught by the opening edge of the die can be prevented.
In the outer punching and laminating step, the outer shape of the iron core piece is punched together with the connecting member, and is laminated on the lower iron core piece and the connecting member previously formed by punching. , It can be prevented from being caught by the magnetic pole piece of the core piece punched out first.
And, when the connecting member is ring-shaped and the inner diameter side (radially inner side) is opened, the shear stress due to the punch can be released to the inner diameter side in the cutting and bending process, the separation process, and the pushback process, and the iron core It is possible to manufacture a laminated core without deformation, in which the pieces are formed flush with the thin plate material.
In addition, since the manufactured laminated core has a laminated connecting member formed by laminating ring-shaped connecting members on the front side of each magnetic pole part, when welding or molding is performed on the stator core In this case, the laminated connecting member that connects the front sides of the magnetic pole portions can be used as a guide, and deformation of the magnetic pole piece portion used as the guide can be made difficult to occur when the magnetic connecting portion is attached to or detached from the processing apparatus.
Further, when the connecting members having the inner diameter side opened are laminated, since the shearing stress is released to the inner diameter side of the ring-shaped connecting member at the time of punching, the laminated connecting member can be easily removed.
Accordingly, deformation of the tip end portion of the magnetic pole piece portion of the iron core piece can be prevented, production interruption due to product failure can be suppressed and further prevented, and a product of good quality can be efficiently manufactured.

Further, in the method for manufacturing a laminated core according to the present invention, when the outer peripheral edge of the connecting member is in contact with the radially inner side of the magnetic pole piece and the inner peripheral contour of the connecting member is circular, the inner peripheral contour of the connecting member is smooth. It is possible to prevent the connecting member from being caught when the thin plate material is conveyed.
When the rotor is punched and removed in advance, the thin plate material can be effectively used.
Furthermore, when the annular yoke piece connecting the magnetic pole pieces at the base portion is cut and separated at the position of each slot in the previous step of the slot extraction process, the iron core piece is divided and is likely to be caught. However, since the magnetic pole piece portions can be held together by the connecting member, the effect of the present invention becomes more remarkable.

It is a perspective view of the stator core manufactured with the manufacturing method which concerns on the 1st Embodiment of this invention. It is a sectional side view of the same stator core. It is explanatory drawing of the yoke part cutting bending process, yoke part pushback process, and slot extraction process of the manufacturing method of the laminated core which concerns on the 1st Embodiment of this invention. It is explanatory drawing of the cutting process and pushback process of the manufacturing method of the laminated iron core. (A), (B) is detailed explanatory drawing of the cutting and bending process of the manufacturing method of the laminated core, respectively, (C)-(E) is detailed explanatory drawing of the pushback process of the manufacturing method of the laminated iron core, respectively. It is explanatory drawing of the crimping part formation process of the manufacturing method of the same laminated iron core, and an outline extraction lamination process. It is explanatory drawing of the slot extraction process, the cutting and bending process, and the pushback process of the manufacturing method of the laminated iron core which concerns on the 2nd Embodiment of this invention. It is explanatory drawing of the crimping part formation process of the manufacturing method of the same laminated iron core, and an outline extraction lamination process. It is explanatory drawing of the bending process and pushback process of the manufacturing method of the laminated core which concerns on the 3rd Embodiment of this invention. (A), (B) is detail explanatory drawing of the isolation | separation process of the manufacturing method of the same laminated iron core, respectively. (A)-(C) are the detailed explanatory drawings of the pushback process of the manufacturing method of the same laminated iron core, respectively.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
First, a laminated iron core manufactured by the manufacturing method according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. This laminated iron core is a laminated iron core (hereinafter also simply referred to as a stator iron core) 10 for a stator, and a so-called inner rotor type stator iron core disposed with a gap outside the rotor iron core (rotor). It is a stator used for

The stator core 10 is formed by annularly arranging divided laminated cores 11 obtained by dividing the stator core 10 into a plurality of pieces (here, 9 pieces) in the circumferential direction.
Each of the divided laminated cores 11 is formed by caulking and laminating a plurality (usually a large number) of divided core pieces 12, and is integrated with the arc-shaped divided yoke portion 13 and the inner center of the divided yoke portion 13. And a magnetic pole portion 14 connected to the.
Each of the divided core pieces 12 includes a divided yoke piece portion 17 having connecting portions 15 and 16 formed on both sides, and a magnetic pole piece portion 18 that is integrally connected to the center inner side of the divided yoke piece portion 17. The connecting portion 15 is formed with a convex portion, and the connecting portion 16 is formed with a concave portion that fits into the convex portion.

A ring-shaped laminated connecting member 20 formed by laminating a plurality of (usually many) ring-shaped connecting members 19 on the radially inner side of the stator core 10 (the front side of each magnetic pole portion 14). Has been placed. The connecting member 19 has a circular inner periphery 21 (inner circle) and a radial width of, for example, about 0.5 to 10 mm. The connecting member 19 abuts the outer peripheral edge 22 once separated (separated) from the front side located radially inward of the magnetic pole piece 18 on the tip surface 23 of the magnetic pole piece 18.

And in order to connect the adjacent division | segmentation laminated | stacked cores 11, the stator core 10 is completed by performing welding, a mold, etc. to the stator core 10. FIG.
Thus, after the manufacture of the stator core 10 is completed, the laminated connecting member 20 is removed from the stator core 10. In addition, since the lamination | stacking connection member 20 was previously cut | disconnected (sheared) from the magnetic pole part 14 as mentioned above, it is fixed by applying force to the lamination | stacking connection member 20 from the axial direction of the stator core 10. The laminated connecting member 20 can be easily removed from the core 10.

Then, the manufacturing method of the laminated core which concerns on the 1st Embodiment of this invention is demonstrated. In addition, since the stator core 10 to be manufactured is a stator used for an inner rotor type, in the following description, the front side of the magnetic pole piece 18 is the radially inner side.
First, as shown in FIG. 3, a thin plate material 28 (electromagnetic steel sheet) having a plate thickness of about 0.15 to 0.5 mm in which pilot holes 26 are formed at predetermined intervals on both sides in the width direction and the rotor 27 is punched and removed in advance. ) Is conveyed to the yoke cutting process.
Here, in the formation region of the split yoke piece 17 of the plurality of split core pieces 12 arranged in a ring shape shown by the two-dot chain line in FIG. 3, the connecting portions 15 and 16 of the adjacent split core pieces 12 are sheared and separated, The separated connecting portion 16 on one side is bent.
In addition, the code | symbol 29 shown in FIG. 3 has shown the cutting / bending line of the site | part separated by shearing.

Next, the thin plate material 28 that has been subjected to the yoke section cutting and bending process is conveyed to the yoke section pushback process.
Here, the portion 30 bent in the yoke cutting step is pushed back by a flat punch or a stripper lower surface (not shown), so that the cut portion 30 is flush with the thin plate material 28, that is, a portion that is cut and bent. The front and back surfaces of 30 are matched with the front and back surfaces of the thin plate material 28. In addition, the code | symbol 31 is the cyclic | annular core piece (1 layer core piece which comprises the stator core 10) which consists of the division | segmentation core piece 12 divided into multiple pieces by the circumferential direction.
The yoke part cutting and bending process and the yoke part pushback process described above can be performed by, for example, the method described in Japanese Patent Application Laid-Open No. 2005-318863, but are not limited to this method.

Subsequently, the thin plate material 28 that has been subjected to the yoke push-back process is conveyed to the slot removing process.
Here, a preset number (9 in this case) of slots 32 are punched and formed in the thin plate material 28, and at the same time, the recess 33 is provided by punching from the tip position of the adjacent magnetic pole piece 18 to the inside in the radial direction. A contour excluding the tip of the portion 18 is formed. As shown in FIGS. 3 and 4, the protrusion margin of the concave portion 33 protruding inward in the radial direction from the inner hole 34 formed by the tip surface 23 of the magnetic pole piece 18 is, for example, the radial direction of the connecting member 19. It is about 10 to 50% of the width.
As described above, the annular yoke piece connecting each magnetic pole piece 18 with the base located radially outward is cut and separated at the position of each slot 32 in the previous step of the slot removing process. The tips of the pieces 18 are connected by a connecting member 19.
Here, the slot extraction process may be performed as a pre-process of the yoke cutting process, and in that case, since the slot is formed first, the load applied to the punch during the cutting process can be reduced, As a result, the tool life can be extended.

Then, the thin plate material 28 that has been subjected to the above-described slot removing process is conveyed to the cutting and bending process of the magnetic pole piece 18.
Here, as shown in FIGS. 4, 5 </ b> A, and 5 </ b> B, the ring-shaped connecting member 19 that connects the front side of each magnetic pole piece portion 18 by the punch 35 and the die 36 is connected to each magnetic pole piece portion. 18 is partially sheared and separated from the tip 37 of the magnetic pole piece 18 along the inner hole 34 of the magnetic pole piece 18, and the magnetic pole piece 18 is bent at the center in the radial direction (specific location in the radial direction) by the lowering of the punch 35. The tip 37 of the magnetic pole piece 18 is directed downward.
The die 36 is provided with a pushback slider 39 that is urged upward by a spring 38 to support bending of the tip 37 of the magnetic pole piece 18. Reference numeral 40 denotes a stripper plate for pressing the thin plate material 28 from above.

Here, the partial shear separation means that the connecting member 19 is half-extracted from the tip end portion 37 of the magnetic pole piece portion 18 or completely separated, and the connecting member 19 falls from the tip end portion 37 of the magnetic pole piece portion 18. This means that the front end surface 23 of the magnetic pole piece 18 and the outer peripheral edge 22 of the connecting member 19 are overlapped in the thickness direction of the thin plate material 28 so as not to occur. Specifically, as shown in FIG. 5B, the overlap X in the thickness direction between the tip surface 23 of the magnetic pole piece 18 and the outer peripheral edge 22 of the connecting member 19 is 30 which is the thickness T of the thin plate material 28. It is performed so as to be about 80%. When this overlap margin exceeds 80%, the lowering distance of the punch is shortened, and the connecting member cannot be completely separated from the magnetic pole piece. On the other hand, if the overlap allowance is less than 30%, the overlap allowance is too small, and the force with which each magnetic pole piece supports the connecting member becomes weak, and the connecting member may fall. Therefore, it is preferable to set the lower limit to 40% and the upper limit to 60%.

The overlap margin X can be adjusted without punching the connecting member 19 below the tip 37 of the magnetic pole piece 18, but after punching the connecting member 19 below the tip 37 of the magnetic pole piece 18, It can also be implemented by the elastic force of the magnetic pole piece 18 and the pushback slider 39.
Further, as described above, the radial width of the connecting member 19 is, for example, about 0.5 to 10 mm. When the width in the radial direction is less than 0.5 mm, the width of the connecting member is too narrow, and for example, the connecting member may be cut during slot formation. On the other hand, when the width in the radial direction exceeds 10 mm, for example, when the punched piece at the center is used for manufacturing the rotor, the material cannot be sufficiently secured. Therefore, it is preferable that the lower limit is 0.5 mm and the upper limit is 7 mm.

Note that the above-described cutting and bending process of the magnetic pole piece 18 is limited to the configuration of the above-described embodiment as long as each magnetic pole piece 18 and the connecting member 19 are sheared and can be bent. It is not something.
In addition, the bending position of the magnetic pole piece is not limited to the central portion in the radial direction of the magnetic pole piece, and the tip of the magnetic pole piece is limited to a specific location where the tip of the magnetic pole piece can be directed downward. It may be the side or the base (base).
Then, instead of the above-described cutting and bending step, a separation step of partially shearing the ring-shaped connecting member from each magnetic pole piece portion may be performed. In this case, the magnetic pole piece is sandwiched between the die and the stripper plate, and the connecting member is punched out with the die and the punch.

In this way, the thin plate material 28 that has been subjected to the cutting and bending process is conveyed to the pushback process of the magnetic pole piece 18.
Here, as shown in FIGS. 4 and 5C to 5E, the thin plate material 28 is sandwiched between the die 41 and the stripper plate 42, and the bent portion of the magnetic pole piece portion 18, that is, the central portion in the radial direction is formed. Then, the magnetic pole piece 18 is formed flush with the thin plate material 28 by hitting and pushing back on the lower surface of the stripper plate 42. Here, the term “equal” means that the front and back surfaces of the cut and bent magnetic pole piece portions 18 are matched with the front and back surfaces of the thin plate material 28.
Thereby, the entire distal end surface 23 of the distal end portion 37 of each magnetic pole piece portion 18 can be brought into contact with the outer peripheral edge 22 of the separated connecting member 19.

The thin plate material 28 that has been subjected to the push-back process is conveyed to the caulking part forming process.
Here, as shown in FIG. 6, a plurality of caulking portions 43 are formed in each divided core piece 12. For this caulking portion 43, a well-known caulking structure such as half-cut caulking or V-shaped caulking can be applied. As is well known, the caulking portion of the lowermost divided core piece is a caulking through hole (see FIG. 2).
The caulking portion forming step is optional in the upstream side of the subsequent outline punching and laminating step. For example, when the divided core pieces are connected by means other than caulking (for example, welding, pin ), The caulking portion forming step can be omitted.

Then, the thin plate material 28 that has been subjected to the above-described caulking portion forming step is conveyed to the outer shape stacking step.
Here, as shown in FIG. 6, the outer shape of the iron core piece 31 is punched out, and the iron core piece 31 is separated and formed together with the connecting member 19, and is laminated on the lower iron core piece 31 and the connecting member 19 that are previously punched and formed. Then, the core pieces 31 adjacent to each other in the stacking direction are joined together.
In addition, when laminating, each core piece can be transposed and skewed. In addition, since transposition and skew are well known, description is abbreviate | omitted.

The stator core 10 shown in FIGS. 1 and 2 manufactured by the above method is discharged from a mold apparatus (not shown) and conveyed to the final process.
Since each of the laminated laminated cores 11 of the stator core 10 discharged from the mold apparatus is integrally formed by the laminated connecting member 20, the discharge from the mold apparatus becomes extremely smooth.
And in order to connect the adjacent division | segmentation laminated | stacked iron core 11, after performing welding, a mold, etc. to the stator core 10, the lamination | stacking connection member 20 is removed from the stator core 10. FIG. Moreover, in the assembly, it can be easily formed into an annular shape by connecting the convex portions and the concave portions of the laminated connecting portions 24 and 25 of each divided laminated iron core 11. Thereafter, the stator core 10 is shipped as a product.

Next, a method for manufacturing a laminated core according to the second embodiment of the present invention will be described. A laminated core for a stator manufactured using this method (hereinafter also simply referred to as a stator core) The stator core 10 is different from the stator core 10 only in the shape of the core piece to be used.
As shown in FIGS. 7 and 8, the iron core piece 50 constituting the stator iron core is an annular integrated piece that is not divided into a plurality of pieces in the circumferential direction. For this reason, as shown in FIG. 7, pilot holes 26 are formed at predetermined intervals on both sides in the width direction, and a thin plate material 51 (thin plate material 28) having a thickness of about 0.15 to 0.5 mm punched at the center. Are transported directly to the slot extraction step. In the slot removing step, the slot 32 is formed by the same method as in the above embodiment.

Then, the thin plate material 51 that has been subjected to the slot removing process is sequentially conveyed to the cutting and bending process and the pushback process shown in FIG. In the same manner, the stator core is manufactured by forming the connecting member 19 and the caulking portion 43 and removing the outer shape (stacked connection of adjacent divided laminated cores 11 constituting the stator core 10 shown in FIG. 1). Stator core without parts 24, 25).
The laminated connecting member composed of the laminated connecting members 19 is removed from the stator core manufactured by the method described above and shipped as a product.

Subsequently, a manufacturing method of the laminated core according to the third embodiment of the present invention will be described. This manufacturing method is different from the manufacturing method of the laminated core according to the first embodiment described above. Since only the shape of the split core piece constituting the piece (particularly the shape of the magnetic pole piece part) is different, only the manufacturing method of this different part will be described.
As shown in FIG. 9, the core piece 60 which comprises a stator core is comprised by the division | segmentation core piece 61 which divided this core piece 60 into multiple (18 pieces) in the circumferential direction. Each of the divided core pieces 61 includes a divided yoke piece portion 62 having connecting portions (not shown) formed on both sides, and a magnetic pole piece portion 63 integrally connected to the center inner side of the divided yoke piece portion 62. ing. Here, the space | interval of the adjacent magnetic pole piece part 63 is opened large.

The magnetic pole piece 63 is formed by punching the slot 64 in the slot punching process. The punching of the slot 64 is performed in a region from the proximal end located on the radially outer side of the adjacent magnetic pole piece 63 to the portion excluding the distal end located on the radially inner side (a hatched region having a wide interval shown in FIG. 9). Against.
As a result, a contour excluding the tip side of the magnetic pole piece portion 63 is formed, and a ring-shaped connecting member 65 is disposed inside the iron core piece 60, and the connecting member 65 serves as a tip and a tip portion of each magnetic pole piece portion 63. The side surfaces of 66 are connected (shaded area with a narrow interval shown in FIG. 9). The inner peripheral contour 67 of the connecting member 65 is circular.
Here, the protrusion amount (the protrusion amount in the radial direction) of the peripheral portion 68 of the connecting member 65 protruding to the side surface of the tip portion 66 of each magnetic pole piece portion 63 is, for example, from the tip of each magnetic pole piece portion 63 to the magnetic pole piece portion. It is about 1 to 20% of the width of 63 in the radial direction.

10A and 10B, the ring-shaped connecting member 65 is partially sheared and separated from each magnetic pole piece 63 by the punch 69 and the die 70. The die 70 is provided with a pushback slider 72 urged upward by a spring 71 in order to prevent the connecting member 65 from falling. As shown in FIG. The overlap margin X1 in the thickness direction between the distal end surface 73 of the distal end portion 66 and the outer peripheral edge 74 of the connecting member 65 is about 30 to 80% of the thickness T1 of the thin plate material 75 (same configuration as the thin plate material 28).
Further, since the connecting member 65 is connected to the side surface of the tip 66 of each magnetic pole piece 63, the punch has a shape protruding into the slot 64 (two-dot chain line shown in FIG. 9). .
Next, in the pushback process shown in FIGS. 11A to 11C, the connection member 65 that has been sheared and separated is pressed back by pressing the lower surface of the die 76 and the stripper plate 77, so that the peripheral edge of the connection member 65 is returned. The part 68 is formed flush with the thin plate material 75.
Here, the separation process and the pushback process are performed on the connecting member 65, but the above-described cutting and bending process and pushback process may be performed on each magnetic pole piece 63.

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 embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, the case where the manufacturing method of the laminated core of the present invention is configured by combining some or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
In the said embodiment, although the case where the inner peripheral outline of a connection member was circular was demonstrated, it is not limited to this, For example, an ellipse, a polygon, etc. may be sufficient.
In the above-described embodiment, the case where the stator core is a stator used for the inner rotor type has been described. However, the stator core disposed with a gap inside the rotor core, so-called outer rotor type It may be a stator used for the above. In this case, a plurality of magnetic pole portions protrude outward in the radial direction of the stator core, but the connecting member separated from the magnetic pole piece portion constituting the magnetic pole portion has an inner peripheral edge radially outward of the magnetic pole piece portion. The tip of the magnetic pole piece is disposed so as to surround from the outside so as to abut on the side.

10: laminated iron core, 11: divided laminated iron core, 12: divided iron core piece, 13: divided yoke part, 14: magnetic pole part, 15, 16: connecting part, 17: divided yoke piece part, 18: magnetic pole piece part, 19: Connecting member, 20: Laminated connecting member, 21: Inner peripheral contour, 22: Outer peripheral edge, 23: Tip surface, 24, 25: Laminated connecting portion, 26: Pilot hole, 27: Rotor, 28: Thin plate material, 29: Cutting Bending line, 30: part, 31: iron core piece, 32: slot, 33: recess, 34: inner hole, 35: punch, 36: die, 37: tip, 38: spring, 39: pushback slider, 40: Stripper plate, 41: Die, 42: Stripper plate, 43: Caulking section, 50: Iron core piece, 51: Thin plate material, 60: Iron core piece, 61: Divided iron core piece, 62: Divided yoke piece, 63: Magnetic pole piece 64: Slot, 65 Connecting member, 66: tip portion, 67: inner peripheral contour, 68: peripheral portion, 69: punch, 70: die, 71: spring, 72: pushback slider, 73: tip surface, 74: outer peripheral edge, 75: thin plate Material, 76: Die, 77: Stripper plate

Claims (4)

In the method of manufacturing a laminated core for a stator that is formed by laminating annular core pieces punched from a thin plate material,
Slotting step of punching a preset number of slots in the thin plate material to form a contour excluding the front side of each magnetic pole piece part;
A bending process in which each of the magnetic pole piece portions is bent at a specific location in the radial direction, and a ring-shaped connecting member for connecting the tip side of each of the magnetic pole piece portions is partially sheared and separated from each of the magnetic pole piece portions;
A pushback step in which the bent portion of the thin plate material is pushed back to form the same surface as the thin plate material, and the front side of each of the magnetic pole piece portions is brought into contact with the peripheral edge of the separated connection member;
The outer shape of the iron core piece is punched together with the connecting member, and the iron core piece whose tip side of the magnetic pole piece abuts on the ring-shaped connecting member is stacked on the lower core piece and the connecting member formed by punching first. A laminated iron core manufacturing method comprising: In the method of manufacturing a laminated core for a stator that is formed by laminating annular core pieces punched from a thin plate material,
Slotting step of punching a preset number of slots in the thin plate material to form a contour excluding the front side of each magnetic pole piece part;
A separation step of partially shearing and separating the ring-shaped connecting member for connecting the front side of each magnetic pole piece part from each magnetic pole piece part;
A pushback step in which the connecting member is pushed back to form the same material as the thin plate material, and the front side of each magnetic pole piece is brought into contact with the peripheral edge of the separated connecting member;
The outer shape of the iron core piece is punched together with the connecting member, and the iron core piece whose tip side of the magnetic pole piece abuts on the ring-shaped connecting member is stacked on the lower core piece and the connecting member formed by punching first. A laminated iron core manufacturing method comprising: 3. The method for manufacturing a laminated core according to claim 1, wherein a rotor is punched and removed from the thin plate material in advance. The method of manufacturing a laminated core according to any one of claims 1 to 3 in the previous step of the slot punching step, annular yoke piece for connecting the respective pole piece at the base, the position of each slot A method of manufacturing a laminated iron core, characterized by being cut and bent by