JP2010104154A - Manufacturing method for magnet mounting rotor core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a magnet mounting rotor core that achieves cost reduction by consolidating die devices in a punching-die-device line and enables punching-out of a high-shape-accuracy magnet mounting rotor core piece. <P>SOLUTION: A rotor core piece 19 is formed with an axial hole 12 and a plurality of elongated magnet mounting holes 13-16, arranged along the sides of a polygonal shape centering around the axial hole 12, by press punching from a plate 11 to be processed. When manufacturing a magnet mounting rotor core 10 by punching out the rotor core pieces and laminating them, a moving direction of the plate 11 to be processed is aligned with a rolling direction of the plate 11 to be processed so as to pass the plate 11 to be processed through a press die device and to punch out the magnet mounting holes 13-16 in a direction inclined with respect to the rolling direction of the plate 11 to be processed. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

The present invention relates to a method for manufacturing a magnet-mounted rotor core formed by stacking rotor core pieces each having a magnet mounting hole formed around a shaft hole.

Permanent magnet type electric motors are used to improve torque or increase the efficiency of electric motors. The rotor core 80 incorporated in the permanent magnet type motor is permanent along each side of a regular square (square) centered on the shaft hole 81 in a plan view, for example, as shown in FIG. A rotor core piece 84 in which elongated magnet mounting holes 82 a to 82 d for mounting magnets are arranged is punched out and caulked and laminated via a caulking portion 85. Adjacent magnet mounting holes 82a to 82d are not continuous with each other and are independent from each other. The rotor core 80 is manufactured by stamping and laminating a plurality of rotor core pieces 84 from a thin metal plate 86 (see FIG. 4) of a material with a press mold apparatus, but the cost of forming the rotor core pieces 84 is reduced. It is important to improve the accuracy of the punched shapes of the shaft hole 81 and the magnet mounting holes 82a to 82d. Therefore, when a rotor core piece having a magnet mounting hole formed around the shaft hole is punched out with an external punch and an external punching die, immediately before the external punching, It has been proposed to punch a pressing hole on the outer side of the rotor core piece with a punching die to suppress the material pulling action due to the outer punch (see, for example, Patent Document 1). As a result, it is possible to suppress the material pulling action by the external punching punch with a simple mold device configuration as compared with a mold device in which a reverse pressing mechanism is added in the mold device or an annular tooth portion is provided on the stripper. It is possible to perform punching processing that prevents warping.

JP 2005-65457 A

On the other hand, in order to further reduce the cost of forming the rotor core piece 84 in the manufacture of the rotor core 80, the mold devices in the punching die apparatus row of the rotor core pieces 84 are consolidated to reduce the processing station. Is effective. Therefore, as shown in FIG. 4, while transporting the thin metal plate 86 in the rolling direction, for example, a pair of magnet mounting holes 82a and 82b arranged in parallel to the rolling direction are punched and formed at one processing station. Then, a pair of magnet mounting holes 82c and 82d arranged perpendicular to the rolling direction are simultaneously punched and formed at the next processing station together with the shaft hole 81. Reference numeral 87 denotes a pilot hole used for transporting the thin metal plate 86. However, when the magnet mounting holes 82c and 82d and the shaft hole 81 are simultaneously punched and formed, the shaft hole 81 and the magnet mounting holes 82c and 82d are formed in the thin metal plate 86 portion between the shaft hole 81 and the magnet mounting holes 82c and 82d, respectively. The material pulling action by the punching punch is added, causing a problem that the shaft hole 81 is pulled in the rolling direction and deformed into a long hole shape. In addition, there is a problem that whisker-like burrs are generated in the magnet mounting holes 82a and 82b arranged in parallel to the rolling direction, and the residue rises.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances. A magnet capable of consolidating the die devices in the punching die device row to reduce the cost and punching the magnet-mounted rotor core pieces with high shape accuracy. It aims at providing the manufacturing method of a mounting | wearing type rotor core.

A method for manufacturing a magnet-equipped rotor core according to the present invention that meets the above-described object includes a plurality of elongated holes arranged along a shaft hole and a polygonal side centered on the shaft hole by press punching from a work plate. In the method of manufacturing a magnet-mounted rotor core, in which a rotor core piece formed with a magnet mounting hole is punched and stacked to manufacture a rotor core,
The moving direction of the work plate is matched with the rolling direction of the work plate, the work plate is passed through a press mold apparatus, and the magnet mounting hole is inclined with respect to the rolling direction of the work plate. Punch in the direction you did.

In the method for manufacturing a magnet-mounted rotor core according to the present invention, a part of the plurality of magnet mounting holes punched in a direction inclined with respect to the rolling direction and the shaft hole are simultaneously punched and formed at one processing station. It is preferable.
And it is preferable that the said magnet mounting hole punched and formed simultaneously with the said shaft hole is arrange | positioned on the both sides centering on this shaft hole.
Furthermore, it is preferable that the polygon is a regular even-numbered square, and the magnet mounting holes are arranged to face each other with the shaft hole in the middle.

In the method for manufacturing a magnet-mounted rotor core according to the present invention, the magnet mounting hole is punched in a direction inclined with respect to the plate passing direction (rolling direction) of the plate to be processed. The generation of beard-like burrs can be prevented and, at the same time, the residue can be prevented from rising.

In the method for manufacturing a magnet-mounted rotor core according to the present invention, when a part of a plurality of magnet mounting holes punched in a direction inclined with respect to the rolling direction and a shaft hole are simultaneously punched and formed at one processing station, The number of processing stations is reduced, and the die devices in the punching die device row are integrated, so that the cost of the die device is reduced and the formation cost of the rotor core piece can be reduced.

In the method for manufacturing a magnet-mounted rotor core according to the present invention, when the magnet mounting holes punched and formed at the same time as the shaft hole are arranged on both sides of the shaft hole, both sides of the shaft hole are defined as the rolling direction. The pulling force that pulls in the parallel direction can be weakened, the deformation of the punched shaft hole is prevented, the roundness is maintained, and a rotor core piece with excellent shape accuracy is obtained.
In addition, when the polygon is a regular even-numbered square and the magnet mounting holes are arranged opposite to each other with the shaft hole in the middle, the pulling force that pulls both sides of the shaft hole in a direction parallel to the rolling direction should be equally weakened. And the roundness of the shaft hole can be maintained at a high level.

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 plan view of a magnet-mounted rotor core manufactured by a method for manufacturing a magnet-mounted rotor core according to an embodiment of the present invention, and FIG. 2 is a manufacturing of the magnet-mounted rotor core. It is process explanatory drawing in a method.

As shown in FIG. 1, a magnet-mounted rotor core 10 manufactured by a magnet-mounted rotor core manufacturing method according to an embodiment of the present invention is a thin metal plate 11 (FIG. 2), and a plurality of (four in this case) elongated magnets arranged along the sides of a square hole 12 which is an example of a polygon centered on the shaft hole 12 by press punching. The rotor core piece 19 in which the mounting holes 13, 14, 15 and 16 are formed is formed by punching and stacking. A rotation shaft (not shown) can be fitted and fixed in a communication shaft hole 20 formed by communicating the shaft holes 12 of the plurality of laminated rotor core pieces 19, and the magnet mounting holes 13, 14, Permanent magnets (not shown) can be fitted into the communicating magnet mounting holes 21a to 21d formed by the communication of 15 and 16, respectively, and can be fixed with, for example, an adhesive or a resin.

Here, the magnet mounting holes 13, 14, 15, 16 are formed by punching with a press die device (not shown) while being inclined with respect to the rolling direction of the thin metal plate 11 (matching with the sheet passing direction). ing. For this reason, the magnet mounting holes 13, 14, 15, and 16 do not have an edge parallel to the rolling direction, so that the generation of whisker-like burrs can be prevented and the occurrence of dregs can be prevented.

Then, the manufacturing method of the magnet mounting type | mold rotor core 10 using the manufacturing method of the magnet mounting type | mold rotor core which concerns on one embodiment of this invention is demonstrated.
As shown in FIG. 2, a pressing die device (not shown) having processing stations A to F with the metal thin plate 11 aligned with the rolling direction of the metal thin plate 11 so that the moving direction (passing direction) of the metal thin plate 11 is matched. Pass through. Then, at the processing station A, pilot holes 22 used for transporting the thin metal plate 11 are formed on both sides of the thin metal plate 11 in the width direction.

Next, at the processing station B, the magnet mounting holes 13 and 15 that are arranged in parallel on both sides of the axial hole 12 around the shaft hole 12 and arranged along a pair of opposing sides of the regular square are rolled into the thin metal plate 11. It is punched and formed in a direction inclined with respect to the direction. Here, since the magnet mounting holes 13 and 15 do not have an edge parallel to the rolling direction, no whisker-like burrs are generated in the magnet mounting holes 13 and 15.

Subsequently, at the processing station C, it is disposed obliquely with respect to the rolling direction, and is disposed in parallel with both sides of the shaft hole 12 in the middle and along the remaining pair of opposite sides of the regular square. The magnet mounting holes 14 and 16 and the shaft hole 12 are simultaneously punched and formed. Here, since the magnet mounting holes 14 and 16 do not have an edge parallel to the rolling direction, no whisker-like burrs are generated in the magnet mounting holes 14 and 16. In addition, since the magnet mounting holes 14 and 16 and the shaft hole 12 are simultaneously punched and formed in one processing station, the die devices in the punching die device row can be consolidated, and the cost of the die device can be reduced. Can do.
Further, since the magnet mounting holes 14 and 16 are arranged opposite to each other with the shaft hole 12 in the middle, the pulling force that pulls both sides of the shaft hole 12 in the direction parallel to the rolling direction can be equally weakened, and punching is formed. Therefore, the rotor core piece 19 having excellent shape accuracy can be obtained by preventing the shaft hole 12 from being deformed and maintaining a high roundness.

Further, in the processing station D, caulking portions 18 a are formed in the outer regions of the magnet mounting holes 13, 14, 15, 16, and then in the processing station E, the magnet mounting holes 13, 14, 15, 16 and the shaft hole 12 are formed. The caulking portion 18 is formed in the area between them. Then, at the processing station F, the rotor core piece 19 is removed from the outer shape, and the rotor core piece 19 is caulked and laminated via the caulking portions 18 and 18a. Then, a magnet-mounted rotor core 10 is obtained by caulking and stacking a predetermined number of rotor core pieces 19.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
For example, the caulking portions 18 and 18a formed respectively inside and outside the magnet mounting holes 13 to 16 are formed separately at the processing stations D and E, respectively, but the caulking portions 18 and 18a are simultaneously formed at the processing station D. Also good. Thereby, the processing station E can be reduced.
In addition, although the magnet mounting holes are arranged along the sides of the regular square, they can be arranged along the sides of the positive and even squares having 6 or more corners. The polygon may be a positive / odd square such as a regular pentagon or a regular heptagon.

It is a top view of the magnet mounting type | mold rotor core manufactured by the manufacturing method of the magnet mounting type | mold rotor core which concerns on one embodiment of this invention. It is process explanatory drawing in the manufacturing method of the magnet mounting type | mold rotor core. It is a top view of the rotor core which concerns on a prior art example. It is process explanatory drawing in the manufacturing method of the rotor core which concerns on a prior art example.

Explanation of symbols

10: Magnet mounting type rotor core, 11: Metal thin plate, 12: Shaft hole, 13, 14, 15, 16: Magnet mounting hole, 18, 18a: Caulking part, 19: Rotor core piece, 20: Communication shaft hole , 21a, 21b, 21c, 21d: communicating magnet mounting hole, 22: pilot hole

Claims (4)

A rotor core piece in which a shaft hole and a plurality of elongated magnet mounting holes arranged along a polygonal side centering on the shaft hole are punched and laminated from a work plate by punching and stacking. In the method of manufacturing a magnet-mounted rotor core for manufacturing a rotor core,
The moving direction of the work plate is matched with the rolling direction of the work plate, the work plate is passed through a press mold apparatus, and the magnet mounting hole is inclined with respect to the rolling direction of the work plate. A method for manufacturing a magnet-mounted rotor core, characterized by punching in the direction that is performed. 2. The method of manufacturing a magnet-mounted rotor core according to claim 1, wherein a part of the plurality of magnet mounting holes punched in a direction inclined with respect to a rolling direction and the shaft hole are simultaneously punched and formed at one processing station. A method for manufacturing a magnet-mounted rotor core, characterized in that: 3. The method of manufacturing a magnet-mounted rotor core according to claim 2, wherein the magnet mounting holes formed by punching simultaneously with the shaft hole are arranged on both sides of the shaft hole. Manufacturing method of magnet-mounted rotor core. 4. The method of manufacturing a magnet-mounted rotor core according to claim 3, wherein the polygon is a regular even-numbered square, and the magnet mounting holes are arranged to face each other with the shaft hole in the middle. Manufacturing method of magnet-mounted rotor core.

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