JP3776052B2 - Laminated iron core - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a laminated iron core used for electromagnetic application equipment such as a motor and a transformer.
[0002]
[Prior art]
Conventionally, in the production of laminated iron cores such as motors and transformers, the core piece is continuously punched out by a press from a silicon steel sheet or the like that is continuously conveyed, and two or more caulking portions are formed in the iron piece, Lamination was performed sequentially in the mold. And as a caulking part, the half caulking circular caulking part which has a projection part on one side and a dent on the other side, and the caulking part which is half-cut with a V-shaped cross section are known.
On the other hand, in recent years, motor cores and the like are moving toward thinning for the purpose of increasing efficiency. For example, a magnetic iron plate having a thickness of about 0.15 to 0.3 mm or less is used.
[0003]
[Problems to be solved by the invention]
However, when the half-clamped type caulking part conventionally used is applied to such a thin magnetic iron plate, the contact area of the caulking part between the upper and lower iron core pieces is small, resulting in insufficient core strength. It causes problems such as disassembly during assembly.
The present invention has been made in view of such circumstances, and of course provides a laminated core that can be caulked and bonded more firmly even if the thickness of the core piece is normal, even if the thickness of the core piece is thin. For the purpose.
[0004]
[Means for Solving the Problems]
In the laminated iron core according to the first aspect of the invention, the upper and lower iron core pieces are laminated through one or more caulked portions,
The caulked portion is cut off one end of the core piece body comprises a cantilever on both sides parallel bent downward the other end is continuous with the core piece body, moreover, the cantilever Is provided with two facing each other, with a narrow uncut portion at the center,
Further, the opposing cantilever pieces are crushed by a projecting punch provided with a gap into which the uncut portion is inserted during caulking to widen and extend in the length direction to caulk the lower core piece main body. It is hanging on the part .
As a result, the cantilever piece enters into the depth of the caulking hole of the lower iron core piece, and the contact area increases. In addition, two cantilever pieces are provided facing each other, and a narrow uncut portion is provided at the center thereof, so that the load in the length direction of the cantilever pieces balances and the upper and lower iron core pieces move. Stable bonding without any problems.
[0005]
Also, the cantilever is longer than the entire length of the cutout portion of its length is has該片piece, because the front portion in the core piece body downward crimping when is hooked, the upper and lower core pieces Bonding strength is further increased.
And the laminated iron core which concerns on 2nd invention is a laminated iron core which concerns on 1st invention, Each said core piece is comprised by combining several ultra-thin core pieces. As a result, an extremely thin core piece can be used. And the magnetic characteristic and physical characteristic of each ultra-thin core piece can be varied.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is a partial cross-sectional view of a laminated core according to an embodiment of the present invention, FIG. 2 is an explanatory view showing a method for manufacturing the laminated core, and FIGS. 3 (A) and 3 (B) are respectively the same laminated core. 4A and 4B are explanatory diagrams of the caulking portion of the core piece of the same laminated core, and FIG. 5 is a perspective view of the laminated core. 6A to 6D are explanatory diagrams of other caulking portions, respectively.
[0007]
As shown in FIGS. 1-5, the laminated iron core 10 which concerns on one embodiment of this invention is a rotor (rotor) of a motor, Comprising: It is thin (thickness is 0.15-0.3 mm) which consists of a magnetic iron plate. Degree), and a predetermined number of the core pieces 11 and the core pieces 12 on the bottom are laminated. A shaft hole 14 through which the output shaft passes is formed in the central boss 13, and nine magnetic pole portions 15 are provided around the shaft hole 14. Each magnetic pole portion 15 is formed with a caulking portion 16, and the boss 13 is formed with three caulking portions 17.
The iron core piece 11, the iron core piece 12 thereon, and the upper and lower iron core pieces 12 are connected by a plurality of caulking portions 16 and 17.
[0008]
Since the caulking portions 16 and 17 have the same structure, only the caulking portion 16 will be described below. As shown in FIGS. 1, 4A, and 4B, the caulking portion 16 has cantilever pieces 18 and 19 that are punched and formed at predetermined locations (magnetic pole portions 15) of the iron core piece 12. Each of the pieces 18 and 19 has a rectangular shape parallel to both sides in plan view, and one end portion (tip portion) 22 is disposed opposite to each other with the narrow uncut portion 20 as the center. One end 22 of the cantilevered pieces 18 and 19 is cut off from the core piece main body 21, and the other end 23 is bent downward continuously from the core piece main body 21. The core piece main body 21 refers to a planar main portion of the core piece 12.
[0009]
Of the laminated iron cores 10, the lowermost iron core piece 11 does not need to be connected to the lower iron core piece, and therefore no caulking portion is provided, as shown in FIGS. 1, 3A, and 3B. In addition, it has caulking holes 24 and 25 into which the cantilevered pieces 18 and 19 of the caulking portion of the upper iron core piece 12 are inserted, and the width and length of the caulking holes 24 and 25 are the same as It is the same. An uncut portion 26 is provided at the center of the caulking holes 24, 25, and the caulking holes 24, 25 are formed in the core piece main body 27.
Therefore, the laminated core 10 is formed by laminating a plurality of core pieces 12 on the lowermost core piece 11, but in the caulking holes 24, 25 of the lowermost core piece 11, The portions where the cantilevered pieces 18 and 19 of the twelve caulking portions 16 (17) are bent downward and project are inserted. Then, by crushing the tip portions of the cantilevers 18 and 19 with the tip portions of the punches 28 shown in FIG. 1, the tip portions of the cantilever pieces 18 and 19 are extended, and the end portions thereof are the lower caulking holes 24 and 25. It will not be caught in the end of the. That is, the total length of the cantilevered pieces 18 and 19 is longer than the total length of the cutout portions 18a and 19a of the cantilevered pieces 18 and 19. The punch 28 is provided with a gap 28a into which the uncut portion 20 is fitted. This situation also applies to the iron core pieces 12 that are sequentially laminated on the iron core pieces 12, and the caulking portions 16 (of the upper iron core pieces 12 in the holes facing the caulking portions 16 (17) of the lower iron core pieces 12. 17) the cantilevered pieces 18 and 19 project downward. In this way, the iron core piece 11 and the iron core piece 12 thereon are firmly connected to form a laminated iron core 10 shown in FIG.
[0010]
Next, a method for manufacturing the laminated core 10 will be schematically described with reference to FIG.
A thin sheet core material 29 suitable for the width of the laminated core 10 (in this case, the rotor) is prepared, and at the station A, pilot holes 30 are provided at predetermined intervals (L) on both sides in advance, that is, one of the core pieces 11, 12. It is formed at a processing pitch. The pilot hole 30 determines the feed pitch of the thin sheet core material 29.
At the next station B, nine slot holes 31 are punched out by punching around the center position of the core piece not shown, and the caulking holes 24 and 25 (see FIG. 3) of the lowermost core piece 11 are formed at the station C. To do. The caulking holes 24 and 25 to be paired are formed in the portion that becomes each magnetic pole portion 15 and the portion that becomes the boss 13 in the iron core piece 11, but the portion that becomes the boss is divided into three equal parts and formed in three places. ing.
[0011]
Next, in the station D, the caulking portions 16 and 17 (see FIG. 4) of the iron core piece 12 to be superimposed on the iron core piece 11 are formed. The part to be formed is the same as the position of the iron core piece 11, and one part is formed on the part to be the magnetic pole part 15 and three parts are formed on the part to be the boss 13. In this case, when the iron core piece 12 passes through the station C, the press work at the station C is not performed, and when the iron core piece 11 passes through the station D, the press work at the station D is not performed.
At the station E, the outer shape of each of the core pieces 11 and 12 and the shaft hole 14 are punched out and stacked in a mold provided at the lower part. The shaft hole 14 may be removed at the station D. In this case, the inner punch used in the station D (of course, there is a lower die) may be simply provided with a cutter for cutting out the outer shape and the shaft hole 14, but the iron core piece 12. Protruding punches that push the caulking portions 16 and 17 into the caulking holes 24 and 25 of the iron core piece 11 and the caulking portions 16 and 17 of the iron core piece 12 below the caulking portions 16 and 17 of the iron core piece 12 are provided. There may be. The shape of the protruding punch is substantially the same as that shown by the two-dot chain line in FIG. Thereby, the connection by the caulking portions 16 and 17 of the upper and lower iron core pieces 11 and 12 can be further strengthened. In this process, the cantilevered pieces 18 and 19 are also widened and extended in the length direction, so that stronger caulking can be performed.
[0012]
Through the above steps, the laminated core 10 as shown in FIG. 5 is automatically manufactured. The lower mold in the station E where the laminated iron core 10 is assembled is provided with a rotation mechanism, and after one iron core piece 12 is laminated, the mold is rotated 40 degrees, so that the direction of the iron core piece 12 is changed. Even if there is some variation in the thickness of the thin sheet iron core material 29, the laminated core 10 having a uniform height is formed and the magnetic characteristics of the magnetic pole portions 15 are also uniform.
6 (A) to 6 (D) show other examples of caulking portions used when stacking and connecting a plurality of iron core pieces. As shown in FIG. The tip of one of the cantilevers 37 to 40 is not a straight line, but a recess (A) or (B) is formed on the center side, and a protrusion (C) is formed on the center side, or a zigzag shape (D ). As a result, the state of engagement with the central uncut portions 41 to 44 is improved, and the upper and lower iron core pieces are caulked and connected more firmly.
[0013]
The present invention is not limited to the above-described embodiment, and modifications can be made without changing the gist of the present invention. For example, in the above-described embodiment, the single sheet iron core material 29 is individually pressed. However, the present invention also applies to the case where an iron core piece in which a plurality of ultrathin core pieces are combined and stacked from the beginning is used. The invention applies.
Furthermore, although the specific number (for example, plate | board thickness) was described and demonstrated in the said embodiment, this invention is not limited to these numbers.
In the embodiment described above, the laminated iron core is exemplified by the rotor of the motor. However, the present invention is also applicable to a stator of the motor, and in some cases a transformer.
[0014]
【The invention's effect】
The laminated iron core according to claim 1 or 2 , wherein one end of the caulking portion is cut off from the core piece main body, and the other end is a cantilever parallel to both sides which is bent continuously downward from the core piece main body. Since the cantilever piece on one end side that has been cut off more bites into the caulking part of the iron core piece directly below (caulking hole at the bottom), the contact area between the upper and lower iron core pieces increases. In addition, the strength of the laminated iron core is improved.
Further, two cantilever pieces are provided facing each other, and a narrow uncut portion is provided at the center thereof, so that a horizontal load caused by the caulking portion can be canceled and a stable caulking portion can be configured.
Furthermore, since the cantilever piece has an overall length longer than that of the cut-out portion, and its tip is hooked to the lower core piece body during caulking, not only both sides of the caulking portion but also one end (tip portion) ) Also exerts a latching action, so that the upper and lower iron core pieces are more firmly connected.
And since the laminated iron core of Claim 2 is comprised by combining several ultra-thin iron core pieces, it becomes easy to comprise a laminated iron core combining a special iron core piece.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a laminated iron core according to an embodiment of the present invention.
FIG. 2 is an explanatory view showing a method for manufacturing the laminated iron core.
FIGS. 3A and 3B are explanatory diagrams of caulking portions formed on the lowermost iron core piece of the same laminated iron core, respectively.
4A and 4B are explanatory diagrams of caulking portions of core pieces of the same laminated core.
FIG. 5 is a perspective view of the laminated core.
6A to 6D are explanatory diagrams of other caulking portions, respectively.
[Explanation of symbols]
10: laminated iron core, 11, 12: iron core piece, 13: boss, 14: shaft hole, 15: magnetic pole portion, 16, 17: caulking portion, 18, 19: cantilever piece, 18a, 19a: cutout portion, 20: Uncut part, 21: Iron core body, 22, 23: End, 24, 25: Caulking hole, 26: Uncut part, 27: Iron core body, 28: Punch, 28a: Air gap, 29: Thin steel core material , 30: pilot hole, 31: slot hole, 33-36: caulking part, 37-40: cantilever, 41-44: uncut part

Claims (2)

In the laminated iron core in which the upper and lower iron core pieces are laminated through one or more caulking portions,
The caulked portion is cut off one end of the core piece body comprises a cantilever on both sides parallel bent downward the other end is continuous with the core piece body, moreover, the cantilever Is provided with two facing each other, with a narrow uncut portion at the center,
Furthermore, the opposing cantilever pieces are crushed by a projecting punch provided with a gap into which the uncut portion is inserted during caulking to widen and extend in the length direction to caulk the lower core piece main body. A laminated iron core characterized by being hooked to a part . 2. The laminated core according to claim 1 , wherein each of the iron core pieces is formed by combining a plurality of ultrathin iron core pieces.

Images