KR102620775B1 - Laminated core and manufacturing apparatus and method for the same - Google Patents

Abstract

The present invention relates to a laminated core capable of improving the area ratio of a laminated core manufactured by embossing and fastening a lamina member, and a laminated core manufacturing apparatus and method, wherein the laminated core penetrates the first embossing protruding outward. A first lamina member in which first embossed through-holes are formed radially alternately, a second embossed through-hole formed through which the first embossing is inserted, and a second protruding outward at a position corresponding to the first embossed through-hole. It includes a second lamina member on which embossing is formed, and a base lamina member disposed at the bottom and formed only with a third embossed through hole through which the first embossing or the second embossing is inserted, and the base lamina member is formed on the base lamina member. 1 The lamina member and the second lamina member are sequentially stacked so that the first embossing is fitted into the second embossed through-hole and the second embossed is fitted into the first embossed through-hole. In this form, the effect of improving the space factor of the laminated core can be obtained by alternately forming the embossing formed on the lamina member.

Description

Laminated core and laminated core manufacturing equipment and manufacturing method {LAMINATED CORE AND MANUFACTURING APPARATUS AND METHOD FOR THE SAME}

The present invention relates to a laminated core and a laminated core manufacturing apparatus and method, and more specifically, to a laminated core and a laminated core manufacturing apparatus and manufacturing method that can improve the area ratio of a laminated core manufactured by embossing a lamina member. It's about method.

A motor is a mechanical device that obtains rotational power from electrical energy and includes a stator and a rotor. The rotor interacts electromagnetically with the stator and rotates with the force exerted by the magnetic field and the current flowing in the coil.

The stator refers to a stationary part of a rotating device such as a motor, that is, a fixed part that does not rotate. For example, in the case of an induction machine, the stator is composed of a stator core and a stator winding.

The rotor and stator may be made of a laminated core manufactured by stacking several layers of lamina members, which are thin metal plates, and then integrating them.

As a method of manufacturing the laminated core, a method of integrally fixing lamina members laminated in multiple layers using a welding fixing method using laser welding or a rivet fixing method is known.

However, when integrating lamina members laminated by a welding fixing method, there is a problem in that the lamina members undergo thermal deformation due to welding heat and change their physical properties.

And, Korean Patent No. 10-0762744 (hereinafter referred to as 'Patent Document 1') discloses a laminated core manufacturing device.

In Patent Document 1, referring to FIG. 1, when blanking a metal strip in a blank block, an interlock tab 14 is formed on the lamina member 10 and an interlock tab 14 of the lower lamina member 10 is attached to the interlock tab 14. Combine while pressing to fit. That is, when stacking the limina members 10, they are clamped together through the interlock tabs 14 to form the stacked core 20.

In this way, in the laminated core 20 manufactured according to the conventional patent document 1, the interlock tab 14 is formed at the same position, so that there is a gap between the upper and lower lamina members 10 at the portion where the interlock tab 14 is laminated. It happens little by little.

That is, when manufacturing the laminated core 20 with a thickness of 40 mm by stacking the lamina members 10 with a thickness of 0.2 mm, 20 sheets must be stacked, but the stacking of the interlock tabs 14 formed at the same position A laminated core 20 having a thickness of 40 mm is formed by stacking only 18 sheets due to the gap generated by .

Because of this, there is a problem that the space factor, which is the area ratio within the same height, is lowered.

Korean Patent No. 10-0762744 (2007.09.21)

The present invention was created to solve the above problems, and provides a laminated core and a laminated core manufacturing apparatus and manufacturing method that can improve the space factor of the laminated core by alternately forming embossing formed on the lamina member. That's the purpose.

In order to achieve the above object, a laminated core according to a preferred embodiment of the present invention includes a first lamina member in which first embossings protruding outward and first embossed through holes formed radially alternately; a second lamina member including a second embossed through-hole formed through which the first embossing is inserted, and a second embossed protruding outward at a position corresponding to the first embossed through-hole; And a base lamina member disposed at the bottom and formed only with a third embossed through hole through which the first embossing or the second embossing is inserted. It includes the first lamina member and the second lamina member on the base lamina member. Two lamina members are sequentially stacked so that the first embossing is fitted into the second embossed through-hole, and the second embossed is fitted into the first embossed through-hole.

In order to achieve the above object, a laminated core manufacturing apparatus according to a preferred embodiment of the present invention includes a lower mold; an upper mold disposed to face the lower mold and moving in a vertical direction with respect to the lower mold; a punching unit provided in the upper mold and forming a perforation of a predetermined shape by punching a thin plate; An emboss forming unit provided in the upper mold and punching a thin plate to alternately form embossing and embossing through-holes into which the embossing is inserted. A blanking portion that blanks the upper surface of the thin plate to form a lamina member; and a lamination barrel provided below the blanking part in the lower mold and having a lamination plate on the inside on which the blanked lamina members are laminated.

Here, the emboss forming unit includes a plurality of embossing punches that form the embossing and are provided in a radial direction; and a plurality of embossed through-hole punches provided radially to form the embossed through-holes between the embossings.

In addition, the stacked barrel can be configured to rotate the stacked lamina member by an angle formed by the embossing and the embossed through-hole based on the center of the lamina member when one lamina member is stacked.

Alternatively, the emboss forming unit radially alternately forms first embossing and first embossed through-holes in the area where the first lamina member is formed, and corresponds to the first embossing in the area where the second lamina member is formed. A second embossed through hole is formed at a position, a second embossing is formed at a position corresponding to the first embossed through hole, and the first lamina member and the second lamina member can be sequentially stacked. .

To this end, the emboss forming part includes a base plate rotatably provided on the upper mold; an embossing punch provided on the base plate and forming the embossing; and an embossed through-hole punch provided on the base plate radially alternately with the embossed punch, and forming the embossed through-hole.

Here, when the base plate is formed with embossing and embossed through-holes in a thin plate forming a lamina member, the embossing and the embossed through-holes can be rotated by an angle formed with respect to the center of the lamina member.

The embossing may be formed to protrude from the thin plate at a height smaller than the thickness of the thin plate.

Furthermore, the emboss forming unit may be configured to form the embossing and the embossed through-hole at positions having different radii from the center of the lamina member.

In order to achieve the above object, a method for manufacturing a laminated core according to a preferred embodiment of the present invention includes a hole forming step of punching a thin plate to form a common hole; An emboss forming step of punching a thin plate to radially alternately form embossing and embossing through-holes into which the embossing is inserted; It includes a lamina member stacking step of blanking the thin plates to sequentially form lamina members and stacking them on a lamination barrel.

Here, in the lamina member stacking step, when one lamina member is stacked, the lamina member is stacked while rotating the lamina member by an angle formed by the embossing and the embossed through hole with respect to the center of the lamina member. It can be done to do so.

Alternatively, in the emboss forming step, when embossing and embossing through-holes are formed with an embossing punch and an embossing through-hole punch on a thin plate forming a lamina member, the embossing and the embossing through-holes are formed based on the center of the lamina member. The base plate equipped with the embossing punch and the embossing through-hole punch can be rotated by the angle.

According to the laminated core and the laminated core manufacturing apparatus and manufacturing method according to the present invention, the effect of improving the space factor of the laminated core can be obtained by alternately forming embossing on the lamina member.

Figure 1 is a diagram schematically showing a laminated core formed by laminating conventional embossed lamina members;
Figure 2 is a diagram schematically showing a laminated core manufacturing apparatus according to an embodiment of the present invention;
Figure 3 is a diagram schematically showing another embodiment of the emboss forming part in the laminated core manufacturing apparatus according to an embodiment of the present invention;
Figure 4 is a perspective view schematically showing a lamina member manufactured by the laminated core manufacturing apparatus according to an embodiment of the present invention;
Figure 5 is a cross-sectional view of a laminated core according to an embodiment of the present invention schematically shown by cutting the area AA of Figure 4;
Figure 6 is a perspective view schematically showing a lamina member according to another embodiment manufactured by the laminated core manufacturing apparatus according to an embodiment of the present invention;
Figure 7 is a flow chart schematically showing a method for manufacturing a laminated core according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. This is not intended to limit the present invention to specific embodiments, and should be interpreted as including all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions may include plural expressions, unless the context clearly dictates otherwise.

Unless otherwise defined, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries can be interpreted as having meanings consistent with the meanings they have in the context of related technologies, and unless clearly defined in this application, are interpreted as having an ideal or excessively formal meaning. It may not work.

Hereinafter, specific embodiments of the present invention will be described with reference to the attached drawings.

Figure 2 is a diagram schematically showing a laminated core manufacturing apparatus according to an embodiment of the present invention, Figure 3 is a diagram schematically showing another embodiment of the emboss forming part in the laminated core manufacturing apparatus, and Figure 4 is a diagram schematically showing another embodiment of the emboss forming part in the laminated core manufacturing apparatus. It is a perspective view schematically showing the lamina member manufactured by the laminated core manufacturing apparatus, and Figure 5 is a cross-sectional view of the laminated core according to an embodiment of the present invention schematically shown by cutting the area A-A of Figure 4, Figure 6 is a perspective view schematically showing a lamina member according to another embodiment manufactured by the laminated core manufacturing apparatus.

Referring to FIGS. 2 to 6, the laminated core manufacturing apparatus 100 according to an embodiment of the present invention includes a lower mold 110, is disposed to face the lower mold 110, and is disposed with respect to the lower mold 110. An upper mold 120 that moves in the vertical direction, a punching unit 130 provided in the upper mold 120 and forming a hole of a predetermined shape by punching the thin plate S, and the upper mold 120 ) and an emboss forming portion 140 that punches the thin plate (S) to radially alternately form embossings 211 and 221 and embossing through holes 212 and 222 into which the embossings 211 and 221 are inserted, A blanking portion 150 that forms the lamina member 200 by blanking the upper surface of the thin plate (S), and a lamina provided and blanked on the lower side of the blanking portion 150 in the lower mold 110. The lamination plate 161 on which the members 200 are laminated includes a lamination barrel 160 provided on the inside.

The punching unit 130 is configured to punch a thin plate to form a hole of a predetermined shape.

As an example, the punching unit 130 may be provided with a slot punch 131 that forms a slot into which a magnet is inserted into the laminated core, and a shaft punch 132 that forms a shaft hole into which a shaft is inserted into the laminated core. . In this case, the slot punch 131, the slot punch hole 111 corresponding to the shaft punch 132, and the shaft punch hole 112 are formed in the lower mold 110.

The blanking part 150 is provided in the upper mold 120, and a blanking hole 115 facing the blanking part 150 is formed in the lower mold 110, and the blanking part 150 The lamina member 120 blanked from the thin plate S is inserted into the lamination barrel 150 and laminated on the lamination plate 161.

In addition, the emboss forming part 140 is provided in the upper mold 120 and includes an embossing punch 141 that forms an embossing in the lamina member 200, and an embossing punch 141 that forms an embossing through hole in the lamina member 200. It is provided with a through hole punch (142). In this case, an embossing punch hole 113 and an embossing through-hole punch hole 114 corresponding to the embossing punch 141 and the embossing through-hole punch 142 are formed in the lower mold 110.

Here, the embossing is in the form of a protrusion protruding outward from the lamina member 200, and the embossing through hole is in the form of a hole penetrating the lamina member 200 so that the embossing is inserted and fitted.

The laminated core manufacturing apparatus 100 according to an embodiment of the present invention forms an embossing on the lamina member 200 and stacks the lamina member 200 by inserting and fastening the embossing to integrate the lamina member 200. This is a device that manufactures cores.

In particular, in the present invention, unlike the prior art, embossing (211, 221) and embossed through-holes (212, 222) are formed radially alternately in the lamina member 200, and the lamina member 200 is stacked on the lower side. As the first embossing 211 of the first lamina member 210 stacked on the second lamina member 220 is inserted into the second embossed through hole 222 of the disposed second lamina member 220, It is inserted and fastened. Afterwards, when the second lamina member 220 is laminated on the first lamina member 210, the second lamina member is laminated on the first embossed through hole 212 of the first lamina member 210. The second embossing 221 of 220 is inserted and fastened.

Conventionally, as shown in FIG. 1, there is a problem in that the embossing (14, interlock tab) is stacked while being fitted and fastened at the same position, and the number of lamina members stacked relative to the same height is reduced, thereby reducing the space factor.

Accordingly, in the present invention, after forming embossing and embossed through-holes alternately in the lamina members, the lamina members are stacked alternately, so that the embossing is completely inserted into the embossed through-holes and no gap is formed between the lamina members, so that the lamina members are stacked at the same height. The packing ratio of the lamina member can be improved. That is, when manufacturing a laminated core with a thickness of 40 mm, the laminated core can be manufactured by stacking 20 laminar members with a thickness of 0.2 mm. In addition, the embossing is formed to protrude from the thin plate at a height smaller than the thickness of the thin plate S so that it can be completely inserted into the embossed through hole.

To this end, the embossing forming unit 140 includes an embossing punch 141 provided radially in plurality to form the embossing, and a plurality of embossing through holes provided radially to form the embossing through holes between the embossings. It may include a punch 142. That is, as shown in FIG. 2, the embossing punch 141 and the embossing through-hole punch 142 may be separately provided in the upper mold 120.

In addition, the stacked barrel 160 is configured to rotate the stacked lamina member by an angle θ formed by the embossing and the embossed through hole with respect to the center of the lamina member when one lamina member is stacked.

That is, after the embossing and the embossed through-holes are formed in the thin plate (S), it is blanked by the blanking part 150 and laminated as it is on the laminated plate 161 in the laminated barrel 160, and the embossing formed on the lamina member Since the and embossing are stacked at the same position, the lamina members are stacked while the laminated barrel 160 rotates by the angle θ formed by the embossing and the emboss through hole with respect to the center of the lamina member, as shown in Figure 5 As shown, the embossing may be inserted into the embossed through hole and stacked to be fitted.

To this end, the laminated barrel 160 is provided to rotate in the lower mold 110, and the laminated barrel 160 can be connected to a drive motor 171 and a drive belt 172 to rotate.

And, embossing is not formed on the first lamina member to form the laminated core 300. To this end, the embossing punch 141 does not operate in the area where the first lamina member is formed in the thin plate S, and only the embossing hole punch 142 operates.

As shown in FIG. 5, the laminated core 300 according to an embodiment of the present invention manufactured through the laminated core manufacturing apparatus 100 includes the first lamina member 210 on the base lamina member 230. ) and the second lamina member 220 are sequentially and alternately stacked.

Here, the first lamina member 210 has first embossings 211 protruding outward and first embossed through holes 212 formed radially alternately.

The second lamina member 220 has a second embossed through hole 222 formed through which the first embossing 211 is inserted, and a second embossed through hole 222 that protrudes outward at a position corresponding to the first embossed through hole 212. 2 embossings 221 are formed radially alternately.

In addition, only one base lamina member 230 is formed and placed at the lowest position, that is, at the position of the first lamina member forming the laminated core 300, and the first embossing 211 or the second embossing 221 is inserted. Only the third embossed through hole 232 is formed.

With this configuration, the laminated core 300 is formed by sequentially stacking the first lamina member 210 and the second lamina member 220 on the base lamina member 230, thereby forming the first lamina member located on the upper side. The first embossing 211 of the bare member 210 is inserted into the second embossing hole 222 of the second lamina member 220 located on the lower side, and the second embossing 211 of the bare member 210 is fastened to the second embossing hole 222 of the second lamina member 220 located on the upper side. The second embossing 221 is formed by fitting into the first embossed through hole 212 of the first lamina member 210 disposed on the lower side.

In another embodiment, the emboss forming part 140 radially alternates the first embossing 211 and the first embossed through hole 212 in the area where the first lamina member 210 is formed in the thin plate (S). and a second embossed through hole 222 is formed at a position corresponding to the first embossing 211 in the area where the second lamina member 220 is formed in the thin plate (S), and the first embossed through hole 222 is formed. The first lamina member 210 and the second lamina member 220 may be sequentially stacked by forming a second embossing 221 at a position corresponding to the hole 212.

For this purpose, referring to FIG. 3, the emboss forming part 140 includes a base plate 143 rotatably provided on the upper mold 120, and a base plate 143 provided on the base plate 143 to form the embossing. It may include an embossing punch 141, and an embossing punch 141 and an embossing through-hole punch 142, which are provided radially alternately with the base plate 143 and form the embossing through-hole.

That is, the embossing punch 141 and the embossed through-hole punch 142 can be moved simultaneously to form embossing and embossed through-holes at the same time.

In addition, when the base plate 143 forms embossing and embossed through-holes in the thin plate S forming the lamina member 200, the embossing and the embossed through-holes are based on the center of the lamina member 200. It is made to rotate by the angle (θ) formed by .

That is, after forming embossing and embossed through-holes in the thin plate forming the first lamina member 210, the base plate 143 is rotated by an angle θ to form the second lamina member 220. Form embossing and embossed through holes in the thin plate.

Through this, after the embossing and the embossed through-hole are formed in the thin plate (S), it is blanked by the blanking part 150 and laminated as it is on the lamination plate 161 in the lamination barrel 160, as shown in FIG. 5. As shown, the embossing can be inserted into the embossed through hole and laminated to be fitted.

In another embodiment, the emboss forming part 140 may be configured to form the embossing and the embossed through-hole at positions having different radii from the center of the lamina member 200.

As an example, referring to FIG. 6, in the first lamina member 210, the first embossing 211 is formed on the outer side in the radial direction, and the first embossed through hole 212 is formed on the inner side in the radial direction. In addition, in the second lamina member 220, a second embossing hole 222 is formed on the outer side in the radial direction so that the first embossing 211 is fitted, and the second embossing 221 is formed on the outer side of the first embossing 211. It is formed on the inner side in the radial direction to be fastened to the through hole 212.

In this way, the laminated core manufacturing apparatus 100 of the present invention does not stack the embossing continuously at the same location, but stacks the embossing so that each layer of the lamina member is positioned alternately, thereby improving the area ratio of the lamina member stacked relative to the same height. You can do it.

Figure 7 is a flow chart schematically showing a method for manufacturing a laminated core according to an embodiment of the present invention.

Referring to FIG. 7, the method for manufacturing a laminated core according to an embodiment of the present invention includes a hole forming step (S110) of forming a common hole by punching a thin plate, and an embossing and an embossed through-hole into which the embossing is inserted by punching the thin plate. It includes an emboss forming step (S120) of alternately forming radially, and a lamina member stacking step (S130) of sequentially forming lamina members by blanking thin plates and stacking them on a lamination barrel.

When manufacturing the base lamina member, which is the first lamina member forming the laminated core, in the emboss forming step (S120), only the embossed through hole is formed without forming the embossing.

In addition, when the embossing and the embossed through-holes are formed at the same location in the embossing forming step (S120), in the lamina member stacking step (S130), when one lamina member is stacked, the embossing and the embossed through-holes are formed. The lamina members are stacked while rotating the lamina members at an angle based on the center of the lamina member.

That is, after the embossing and the embossing through-holes are formed in the thin plate, it is blanked by a blanking part and laminated as is in the laminated barrel, so that the embossing and the embossing formed on the lamina member are laminated at the same position, so that the laminated barrel is formed with the embossing and the embossing. The lamina members are stacked while the embossed through-holes rotate at an angle θ based on the center of the lamina member, and as shown in FIG. 5, the embossing can be inserted into the embossed through-holes and laminated to be fastened. .

Alternatively, in the emboss forming step (S120), when embossing and embossing through-holes are formed with an embossing punch and an embossing through-hole punch on a thin plate forming a lamina member, the embossing and the embossing through-hole are based on the center of the lamina member. Rotate the base plate equipped with the embossing punch and emboss through-hole punch by the angle formed by .

The base plate is rotatably installed on the upper mold, and the embossing punch and the embossing through-hole punch are provided radially and alternately on the base plate. That is, the embossing punch and the embossed through-hole punch move simultaneously to form embossing and embossed through-holes at the same time.

And, when the base plate forms embossing and embossed through-holes in the thin plate forming the lamina member, the embossing and the embossed through-holes are rotated by an angle θ formed with respect to the center of the lamina member.

That is, after forming embossing and embossed through-holes in the thin plate forming the first lamina member, the base plate is rotated by an angle θ and then formed embossing and embossed through-holes in the thin plate forming the second lamina member. do.

Through this, after the embossing and the embossed through-holes are formed on the thin plate, it is blanked by the blanking part and laminated as is in the lamination barrel. As shown in FIG. 5, the embossing is inserted into the embossed through-hole and laminated so that it is fastened. It can be.

As such, the method of manufacturing the laminated core of the present invention does not stack the embossing continuously at the same position, but stacks the embossing so that each layer of the lamina member is positioned alternately, thereby improving the space factor of the lamina member stacked relative to the same height. .

Although the present invention has been described in detail through specific examples, this is for detailed explanation of the present invention, and the present invention is not limited thereto, and the present invention is intended to be understood by those skilled in the art within the technical spirit of the present invention. It is clear that modification or improvement is possible.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

100: Laminated core manufacturing device 110: Lower mold
111: slot punch hole 112: shaft punch hole
113: embossed punch hole 114: embossed through hole punch hole
115: Blanking hole 120: Upper mold
130: Punching unit 131: Slot punch
132: shaft punch 140: emboss forming part
141: embossing punch 142: emboss through-hole punch
143: Base plate 150: Blanking part
160: Laminated barrel 161: Laminated plate
171: drive motor 172: drive belt
200: Lamina member 210: First lamina member
211: first embossing 212: first embossing through hole
220: Second lamina member 221: Second embossing
222: 2nd emboss through hole

Claims (12)

A first lamina member having first embossings protruding outward and first embossed through holes formed radially alternately;
a second lamina member including a second embossed through-hole formed through which the first embossing is inserted, and a second embossed protruding outward at a position corresponding to the first embossed through-hole; and
It includes a base lamina member disposed at the bottom and formed only with a third embossed through hole through which the first embossing or the second embossing is inserted,
The first lamina member and the second lamina member are sequentially stacked on the base lamina member, so that the first embossing is inserted into the second embossing through hole, and the second embossing is connected to the first embossing member. A laminated core formed by fitting into a through hole.
lower mold;
an upper mold disposed to face the lower mold and moving in a vertical direction with respect to the lower mold;
a punching unit provided in the upper mold and forming a perforation of a predetermined shape by punching a thin plate;
An emboss forming unit provided in the upper mold and punching a thin plate to alternately form embossing and embossing through-holes into which the embossing is inserted.
A blanking portion that blanks the thin plate to form a lamina member; and
A laminated barrel provided below the blanking part in the lower mold and having a laminated plate on the inside on which the blanked lamina members are laminated;
A laminated core manufacturing device comprising a.
According to paragraph 2,
The emboss forming part,
a plurality of embossing punches forming the embossing and provided radially; and
a plurality of embossed through-hole punches provided radially to form the embossed through-holes between the embossings;
A laminated core manufacturing device comprising:
According to paragraph 3,
The laminated barrel is,
A laminated core manufacturing apparatus, characterized in that when one lamina member is stacked, the lamina member is rotated by an angle formed by the embossing and the embossed through hole with respect to the center of the lamina member.
According to paragraph 2,
The emboss forming part,
First embossing and first embossing through-holes are formed radially alternately in the area forming the first lamina member,
In the area where the second lamina member is formed, a second embossed through hole is formed at a position corresponding to the first embossing, and a second embossing is formed at a position corresponding to the first embossed through hole,
A laminated core manufacturing apparatus, characterized in that the first lamina member and the second lamina member are sequentially laminated.
According to paragraph 2,
The emboss forming part,
A base plate rotatably provided on the upper mold;
an embossing punch provided on the base plate and forming the embossing; and
Embossed through-hole punches are provided on the base plate radially alternately with the embossing punches and form the embossed through-holes;
A laminated core manufacturing device comprising:
According to clause 6,
The base plate is,
When embossing and embossing through-holes are formed on a thin plate forming a lamina member, the embossing and the embossing through-holes are rotated by an angle formed with respect to the center of the lamina member.
According to paragraph 2,
The embossing is,
A laminated core manufacturing device characterized in that it is formed to protrude from a thin plate at a height smaller than the thickness of the thin plate.
According to paragraph 2,
The emboss forming part,
A laminated core manufacturing apparatus, characterized in that the embossing and the embossed through-hole are formed at positions having different radii from the center of the lamina member.
A hole forming step of punching a thin plate to form a common hole;
An emboss forming step of punching a thin plate to radially alternately form embossing and embossing through-holes into which the embossing is inserted; and
A lamina member stacking step of sequentially forming lamina members by blanking thin plates and stacking them on a lamination barrel;
A laminated core manufacturing method comprising.
According to clause 10,
The lamina member stacking step is,
When one lamina member is stacked, the lamina member is stacked while rotating the lamina member by an angle formed by the embossing and the embossed through hole with respect to the center of the lamina member.
According to clause 10,
The emboss forming step is,
When embossing and embossing through-holes are formed with an embossing punch and an embossing through-hole punch on a thin plate forming a lamina member, the embossing punch and the embossing through-hole are equal to the angle formed by the embossing and the embossing through-hole with respect to the center of the lamina member. A laminated core manufacturing method characterized by rotating a base plate provided with a punch.

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