JP2003219585A - Laminated core and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a laminated iron core, which can have its core accuracy enhanced. <P>SOLUTION: This method includes a process of laminating plural sheets of steel plates and joining the fellow vicinities of the sections to be stamped and calked of several steel plates through, for example, welding, a process of simultaneously stamping and of desired molding, plural sheets of the steel plates, where the stacked sections are to be stamped and calked are joined together, and laminating them in the order, and a process of forming projections and recesses in the joined sections and engaging the adjacent projections and recesses with each other in the laminating direction at stacking, thereby fastening and uniting the steel plates to each other stamped, calked, and laminated. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching and caulking structure for integrally laminating laminated cores of a rotating electric machine such as a motor, and more particularly to improvement of core accuracy.

[0002]

2. Description of the Related Art In recent years, with the aim of improving motor efficiency,
The thinning of steel plates applied to laminated cores is progressing. However, on the other hand, the number of steel sheets to be punched is greatly increased due to the thinning, and as a result, there is a problem that productivity is reduced due to the time required for punching. Therefore, for example, in JP-A-2001-16832, although not shown, punching is performed with a plurality of steel plates stacked to form a plurality of iron core members at the same time, thereby improving productivity. The aim is disclosed.

[0003]

As described above, since the conventional laminated iron core is punched at the same time with a plurality of steel sheets stacked in order to improve productivity,
As shown in FIG. 9, a punching and crimping process for stacking integration is performed by pressing a plurality of steel plates 1 against a die 3 with a punch 2 to form concaves and convexes for crimping as shown in FIG. As shown in FIG. 9 (A), each steel plate 1 is pulled in the direction indicated by arrow A in the drawing and is in a state of being subjected to tensile stress. Then, when the punch 2 is separated and released from the tensile stress after the concave and convex portions are formed, each steel plate 1 is pulled back in the direction shown by the arrow B in FIG. 9B, but it is not always symmetrical from all sides. Since it is not always pulled back, there is a problem in that the concave and convex portions of each steel plate 1 are locally displaced, so that the core accuracy is lowered and the efficiency of the motor is deteriorated.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a laminated core capable of improving core accuracy and a method of manufacturing the same. .

[0005]

According to a first aspect of the present invention, a laminated iron core is formed by punching a plurality of steel sheets at the same time to form a desired shape, and fixing them by punching and caulking to successively laminate them. In the laminated core, a plurality of steel plates that are punched at the same time are joined to each other in the vicinity of the portions to be punched and crimped.

In the laminated core according to claim 2 of the present invention, a plurality of steel plates are punched at the same time to perform desired forming, and the laminated core is fixed by punching and caulking to be sequentially laminated and integrated. A plurality of steel plates that are punched at the same time have the parts to be punched and caulked integrated with each other by melting.

In the laminated core according to claim 3 of the present invention, a plurality of steel plates are punched at the same time to perform desired forming, and the laminated core is fixed by punching and caulking to be sequentially laminated and integrated. A plurality of steel plates that are punched at the same time have their portions to be punched and crimped adhered to each other.

According to a fourth aspect of the present invention, in the method of manufacturing a laminated core, a plurality of steel plates are stacked, and the vicinity of the punched and crimped portions of each steel plate are welded together, and a plurality of stacked steel plates are stacked. The method includes a step of punching out a plurality of steel sheets at the same time to perform desired forming and sequentially laminating, and a step of punching and caulking parts to firmly fix and integrate the laminated steel sheets at the time of laminating. .

According to a fifth aspect of the present invention, in the method for manufacturing a laminated iron core, a step of stacking a plurality of steel plates and melting and unifying parts of the steel plates that are to be crimped is integrated, and a plurality of stacked steel plates are stacked. Of the steel sheet, punched at the same time to perform desired forming and sequentially laminating, and at the time of laminating, a step of punching and caulking the integrated portions to firmly fix the laminated steel sheets to each other. It is a thing.

A method for manufacturing a laminated core according to claim 6 of the present invention is the method of manufacturing a laminated iron core according to claim 4 or 5, wherein the parts are joined together by welding, or the parts are fused and integrated. It includes a step of bending the flat steel sheet in the flatwise direction.

A method for manufacturing a laminated iron core according to claim 7 of the present invention is the method of manufacturing a laminated iron core according to claim 4 or 5, wherein the parts are joined together by welding or the parts are fused and integrated. It includes a step of annealing the steel sheet.

A method of manufacturing a laminated iron core according to claim 8 of the present invention comprises a step of stacking a plurality of steel plates and adhering portions of each steel plate to be crimped to each other, and a plurality of stacked steel plates. It includes a step of punching at the same time to perform desired forming and sequentially laminating, and a step of punching and caulking each laminated portion to fix and integrate laminated steel sheets at the time of laminating. .

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1. 1 shows a structure of a laminated iron core according to Embodiment 1 of the present invention. (A) is a plan view, (B) is a side view, and FIG. 2 is a line II- in FIG.
II is a sectional view showing a section taken along line II, FIG. 3 is a block diagram showing a part of a manufacturing process of the laminated core in FIG. 1, and FIG.
FIG. 4 is a block diagram showing part of a manufacturing process of the laminated core in FIG.

In the figure, numeral 11 denotes a desired shape formed by punching, and a concave portion 1 and a convex portion 1 are formed at predetermined positions.
A large number of iron core members 1a and 11b are formed, and the recesses and protrusions 11a and 11b adjacent to each other in the stacking direction are fitted to each other so as to be punched out and laminated by a predetermined number of layers. The iron core 20 is configured. Reference numeral 12 denotes a joint portion locally formed by, for example, welding in the vicinity of the concave and convex portions 11a and 11b of the iron core member 11. For example, as shown in FIG. 11
They are joined in the vicinity of a and 11b.

Reference numeral 13 denotes a steel strip 14 formed by winding a steel strip 14 on each of the windings.
A base coil, 15 is a guide roller for stacking and guiding the respective steel strips 14 unwound from the respective coils 13, and 16 is a local portion near a portion where concave and convex portions 11a and 11b are formed in a later step. Welding means for performing welding to form the joint portion 12, and 17 is a steel strip 1 on which the joint portion 12 is formed.
Reference numeral 4 denotes a plurality of forming rollers for repeatedly bending in the flatwise direction, and reference numeral 18 denotes an induction heating means for annealing the steel strip 14 on which the joint portion 12 is formed.

Next, a method of manufacturing the laminated iron core according to the first embodiment having the above-described structure will be described with reference to the drawings. First, each steel strip 14 unwound from each coil 13
Is locally welded to a predetermined portion of the steel strips 14 stacked by the guide roller 15 and then stacked by the welding means 16 in the vicinity where the concave portions and the convex portions 11a and 11b are formed in the subsequent process. Then, the joint portion 12 is formed. Then, the three steel strips 14 are fixedly integrated by the joint portion 12.

Next, the steel strip 14 thus fixedly integrated is repeatedly bent in the flatwise direction by a plurality of forming rollers 17, and then punched by a progressive die (not shown). Desired molding is sequentially performed by processing, and concave and convex portions 1 are respectively provided at predetermined positions.
1a and 11b are formed, and a large number of three iron core members 11 are simultaneously processed. Then, the iron core members 11 that are fixed and integrated three by three are sequentially stacked and adjacent concave and convex portions 1 are formed.
When 1a and 11b are fitted to each other, they are swaged and caulked, and all of them are fixed and integrated to complete the laminated core 20.

As described above, according to the first embodiment, the joint 12 is formed by welding in the vicinity of the portion where the concave and convex portions 11a and 11b for punching and crimping the iron core member 11 that is simultaneously punched are formed. Since each of the concave portions and the convex portions 1
It is possible to prevent a local shift between 1a and 11b, and it is possible to improve core accuracy.
The steel strip 14 fixedly integrated by the joining portion 12 is repeatedly bent in the flatwise direction by a plurality of forming rollers 17, so that the residual stress generated by melting and resolidification in welding is made uniform, and , Convex portions 11a, 11b
It is possible to further prevent a local deviation from occurring in the.

In the above structure, a plurality of forming rollers 17 are used.
Thus, the steel strip 14 fixedly integrated at the joint 12 is repeatedly subjected to the bending process in the flatwise direction to make the residual stress generated by melting and resolidification in welding uniform, as shown in FIG. Further, if the steel strip 14 fixedly integrated at the joint 12 is annealed by the induction heating means 18, residual stress can be removed, and the local deviations in the concave portions and the convex portions 11a and 11b can be eliminated. Can be further prevented.

Embodiment 2. FIG. 5 is a sectional view showing the structure of the main part of the laminated iron core according to the second embodiment of the present invention.
FIG. 6 is a sectional view showing a manufacturing process of the laminated core in FIG. 5. In the figure, the same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

Numeral 19 is an iron core member which is formed by punching into a desired shape. For example, three iron core members are stacked as shown in FIG. 5, and predetermined positions of the three iron core members 19 are integrated by melting. In addition, concave portions and convex portions 19a and 19b are formed in the integrated portion 21, and the concave portions and convex portions 19a and 19b which are adjacent to each other in the stacking direction are fitted to each other to be pulled out, and a predetermined number of sheets are formed. The laminated core 30 is formed by integrally laminating. 22 is a local heating means such as an arc, a laser, an electron beam, or the like, 2
Reference numerals 3 and 24 are an upper mold and a lower mold for forming the concave and convex portions 19a and 19b.

Next, a method of manufacturing the laminated iron core according to the second embodiment having the above structure will be described with reference to FIG. First, in the same manner as in the first embodiment, three steel strips 14 unwound from the coil are stacked as shown in FIG. 6 (A) and locally heated by the local heating means 22 to be melted. As a result, the concave and convex portions 19a and 19b are formed in a later process
The integrated portion 21 is formed at the position where the is formed. Then, the steel strips 14 stacked in three sheets are fixedly integrated by this portion 21.

Next, although not shown, the steel strip 14 thus fixedly integrated is sequentially subjected to desired forming by punching with a progressive die, and as shown in FIG.
As shown in (B), the integrated part 21 is replaced with the upper mold 2
3 and the lower mold 24 for punching the concave and convex portions 19
a and 19b are formed, and a large number of three iron core members 19 are simultaneously processed. Then, as shown in FIG. 6C, the iron core members 19, which are fixed and integrated three by three, are sequentially laminated, and the concave portions and the convex portions 19a and 19b adjacent to each other are fitted and punched out, and the total number is fixed. They are integrated to complete the laminated core 30.

As described above, according to the second embodiment, the positions where the concave and convex portions 19a and 19b for punching and crimping the respective core members 19 which are punched at the same time are formed are locally heated and melted. As a result, the concave portions and the convex portions 19a and 19a are formed by integrally forming the portion 21.
It is possible to prevent local deviation from occurring in b, and it is possible to improve core accuracy.

Although not described above, part 2
The steel strip 14 melt-integrated by 1 is subjected to the bending process in the flatwise direction repeatedly in the same manner as in the above-described first embodiment to make residual stress generated by melting and re-solidification in local heating uniform, Concave and convex portions 19a, 19
It is possible to further prevent the local deviation from occurring in b, and it is possible to remove the residual stress by performing annealing, so that the local deviation occurs in each of the concave portions and the convex portions 19a and 19b. Needless to say, it is possible to further prevent this.

Embodiment 3. FIG. 7 is a block diagram showing a part of the manufacturing process of the laminated iron core in the third embodiment of the present invention, and FIG. 8 is a sectional view showing a section taken along line VIII-VIII in FIG. In the figure, the same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. Reference numeral 25 is an adhesive dropping means for dropping the adhesive 26 at a predetermined position on the steel strip 14.

Next, a method of manufacturing a laminated core according to the third embodiment of the present invention will be described with reference to the drawings. First, the adhesive 26 is dropped from the adhesive dropping means 25 to a predetermined position on the surface of each steel strip 14 unwound from each coil 13, that is, a portion to be caulked in a later step, and then this adhesion is performed. It is stacked by the guide roller 15 so as to sandwich the portion where the agent 26 is dropped. Then, the adhesive 26 is cured by being heated by the induction heating means 18, and the steel strips 14 are fixedly integrated as shown in FIG.

Although not shown in the drawings, the desired molding is sequentially performed by punching with a progressive die in the same manner as in the first embodiment, and the concave and convex positions are fixed by the adhesive 26, respectively. A portion is formed, and a large number of three iron core members are simultaneously processed. Then, the iron core members that are fixed and integrated three by three are sequentially stacked, and the concave portions and the convex portions that are adjacent to each other are fitted and punched out so that all of them are fixed and integrated to complete the laminated iron core.

As described above, according to the third embodiment, the portions where the concave and convex portions for punching and crimping the respective core members that are punched at the same time are formed are fixed and integrated by the adhesive 26. Further, it is possible to prevent local deviations from occurring in the respective concave and convex portions, and it is possible to improve the core accuracy.

[0030]

As described above, according to claim 1 of the present invention, a plurality of steel plates are punched at the same time to perform desired forming, and are fixed by punching and caulking to be sequentially laminated. In the iron core, a plurality of steel plates that are punched at the same time are joined to each other in the vicinity of the portion to be punched and crimped, so that it is possible to provide a laminated iron core that can improve core accuracy.

According to the second aspect of the present invention, a plurality of steel plates are punched at the same time to perform desired forming, and the laminated iron cores are fixed by punching and caulking to be sequentially laminated and integrated. Since the plurality of steel plates to be processed have the portions to be punched and crimped integrated with each other by melting, it is possible to provide a laminated iron core capable of improving core accuracy.

According to the third aspect of the present invention, a plurality of steel plates are punched at the same time to perform desired forming, and at the same time, in a laminated core which is fixed by punching caulking and sequentially laminated and integrated, Since a plurality of steel plates to be processed are bonded to each other at the portions to be punched and crimped, it is possible to provide a laminated core capable of improving core accuracy.

According to a fourth aspect of the present invention, a step of stacking a plurality of steel plates and joining the vicinity of the punched and crimped parts of each steel plate by welding, and a plurality of the stacked steel plates, At the same time, punching and desired forming are performed, and the steps of sequentially laminating and the steps of laminating and clamping the steel sheets to be laminated by laminating parts at the time of laminating are performed so that the core accuracy can be improved. It is possible to provide a method of manufacturing a laminated iron core that can be improved.

According to a fifth aspect of the present invention, a step of stacking a plurality of steel plates and melting and unifying parts of the steel plates to be integrated is integrated, and a plurality of stacked steel plates are simultaneously formed. Since it includes a step of punching and performing desired molding and sequentially laminating, and a step of laminating and fixing steel plates to be laminated by laminating and punching integrated portions at the time of lamination, It is possible to provide a method for manufacturing a laminated core that can improve core accuracy.

According to claim 6 of the present invention, in claim 4 or 5, the vicinity of the parts is joined by welding, or the parts are melted and integrated into a plurality of steel plates, which are flattened. Since the step of performing the bending process in the wise direction is included, it is possible to provide a method for manufacturing a laminated core that can further improve the core accuracy.

According to claim 7 of the present invention, according to claim 4 or 5, the vicinity of the parts is joined by welding, or the parts are melted and integrated into a plurality of steel plates, which are annealed. Since the step of applying is included, it is possible to provide a method for manufacturing a laminated iron core that can further improve the core accuracy.

Further, according to claim 8 of the present invention, a step of stacking a plurality of steel plates and adhering portions to be punched and crimped of each steel plate, and a plurality of stacked steel plates are punched at the same time. Therefore, the steps of laminating the steel sheets to be laminated are performed by a desired forming process and laminating in sequence, and at the time of laminating, the steps of punching and caulking each laminated portion to firmly fix the laminated steel sheets to each other are integrated. It is possible to provide a method of manufacturing a laminated iron core that can be improved.

[Brief description of drawings]

FIG. 1 shows a structure of a laminated iron core according to a first embodiment of the present invention, (A) is a plan view and (B) is a side view.

FIG. 2 is a sectional view showing a section taken along line II-II in FIG.

FIG. 3 is a block diagram showing a part of a manufacturing process of the laminated core in FIG.

FIG. 4 is a block diagram showing a part of a manufacturing process of the laminated iron core in FIG. 1 different from that in FIG. 3;

FIG. 5 is a sectional view showing a configuration of a main part of a laminated iron core according to a second embodiment of the present invention.

6 is a cross-sectional view showing a manufacturing process of the laminated core in FIG.

FIG. 7 is a block diagram showing a part of a manufacturing process of a laminated iron core according to a third embodiment of the present invention.

8 is a sectional view showing a section taken along line VIII-VIII in FIG. 7. FIG.

FIG. 9 is a cross-sectional view for explaining a problem in a case where a plurality of steel plates are stacked and punched at the same time.

[Explanation of symbols]

11, 19 Iron core member, 11a, 19a Recessed portion, 11
b, 19b convex part, 12 joint part, 13 coil, 14
Steel strip, 15 guide roller, 16 welding means, 17
Forming roller, 18 induction heating means, 20,30 laminated iron core, 21 parts, 22 local heating means, 25 adhesive dropping means, 26 adhesive.

Continued front page    (72) Inventor Kazuyuki Yamamoto             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F-term (reference) 4E081 YN10                 5H002 AA08 AB01 AC03                 5H615 AA01 BB01 BB02 PP06 SS03                       SS05

Claims (8)

[Claims] 1. A laminated core in which a plurality of steel sheets are punched at the same time to perform desired forming, and which are fixed by punching and are sequentially laminated and integrated, wherein the plurality of steel sheets punched simultaneously are A laminated iron core, wherein the vicinity of the portions to be crimped is joined to each other. 2. In a laminated core in which a plurality of steel sheets are punched at the same time to perform desired forming, and are fixed by punching caulking to be sequentially laminated and integrated, the plurality of steel sheets to be punched simultaneously are A laminated core, wherein the portions to be crimped are integrated with each other by melting. 3. A laminated core in which a plurality of steel sheets are punched at the same time to perform desired forming, and which are fixed by punching and are laminated and integrated in sequence, wherein the plurality of steel sheets punched simultaneously are A laminated iron core, wherein the parts to be punched and crimped are adhered to each other. 4. A step of stacking a plurality of steel plates and joining the vicinity of the punched and crimped parts of each steel plate by welding, and punching the stacked plurality of steel plates at the same time to obtain a desired shape. And a step of sequentially laminating, and a step of, during the above-mentioned lamination, punching and caulking the above-mentioned portion to fix and integrate the steel sheets to be laminated together, the method for producing a laminated iron core. 5. A step of stacking a plurality of steel plates and melting and integrating parts of the steel plates to be punched and caulked together, and punching the stacked plurality of steel plates at the same time to obtain a desired shape. And a step of sequentially laminating, and a method of manufacturing a laminated core, including a step of laminating and sequentially laminating, and performing a step of caulking and caulking the integrated portions to firmly bond and integrate the steel sheets to be laminated. . 6. A plurality of steel plates obtained by joining parts near each other by welding or by melting parts and integrating them,
The method for manufacturing a laminated core according to claim 4 or 5, further comprising a step of bending in a flatwise direction. 7. A plurality of steel plates obtained by joining parts near each other by welding or by melting parts and integrating them,
The method for manufacturing a laminated iron core according to claim 4 or 5, which includes a step of performing annealing. 8. A step of stacking a plurality of steel plates and adhering portions of the respective steel plates to be punched and caulked, and the plurality of stacked steel plates are punched at the same time to obtain a desired shape, and sequentially. A method for manufacturing a laminated core, comprising a step of laminating and a step of, during the laminating, performing punching and caulking on each of the laminated portions to firmly bond and integrate the laminated steel sheets.