JP2020120488A - Method for manufacturing rotary electric machine rotor - Google Patents

Abstract

To suppress deformation of a laminated core when a shaft is press-fitted in a shaft hole of the laminated core and to suppress generation of shortage of tightening force between the shaft and the laminated core and imbalance that a centroid of a rotary electric machine rotor deviates.SOLUTION: There is provided a method for manufacturing a rotary electric machine rotor 10 which comprises: a laminated core 1 constituted of a plurality of laminated electromagnetic steel sheets 11 and formed with a shaft hole 12 penetrating in a lamination direction; and a shaft 2 press-fitted in the shaft hole 12 and provided with a flange 21 with outer diameter larger than an inner diameter of the shaft hole 12. Distance in the lamination direction between the flange 21 and the laminated core 1 is measured during press-fit of the shaft 2 in the shaft hole 12 of the laminated core 1, and the press-fit of the shaft 2 is terminated when the distance reaches a predetermined value.SELECTED DRAWING: Figure 3

Description

The present invention relates to a method for manufacturing a rotary electric machine rotor in which a shaft is press-fitted into a shaft hole that penetrates a laminated iron core formed by laminating electromagnetic steel sheets in the laminating direction.

Patent Document 1 discloses a rotary electric machine rotor in which a shaft is press-fitted into a shaft hole of a laminated iron core to be assembled.

JP, 2005-082862, A

When press-fitting a shaft with a flange with an outer diameter larger than the inner diameter of the shaft hole into the shaft hole of the laminated iron core, if the press-fitting length is too long, the flange of the shaft pushes the laminated iron core to deform the laminated iron core. I may end up doing it. On the other hand, if the length of press-fitting is insufficient and there is a gap between the flange and the laminated core, the fastening force between the shaft and the laminated core will be insufficient, or the shaft will be tilted when laminated. An imbalance may occur in which the center of gravity of the rotating electrical machine rotor is biased by being fastened to the iron core. Therefore, the positioning accuracy of the length for press-fitting the shaft is required to be in the order of micrometers. Since there is individual difference in the thickness of the laminated core in the accuracy of the micrometer unit, the length of press-fitting the shaft needs to be adjusted according to the thickness of the individual laminated core.

Further, according to the method of measuring the pressure at which the shaft is press-fitted and detecting the pressure increase at the moment when the flange portion of the shaft contacts the laminated iron core, the flange portion and the laminated iron core are not affected by the individual difference in the thickness of the laminated iron core. However, the flange portion of the shaft has already pushed the laminated core and deformed the laminated core when the pressure suddenly increased at the moment of contact.

Therefore, the present invention suppresses deformation of the laminated core when the shaft is press-fitted into the shaft hole of the laminated core, insufficient fastening force between the shaft and the laminated core, and an imbalance in which the center of gravity of the rotating electrical machine rotor is biased. The purpose is to suppress the occurrence of.

A method for manufacturing a rotary electric machine rotor according to the present invention is composed of a plurality of laminated electromagnetic steel sheets, and a laminated iron core having a shaft hole penetrating in the laminating direction, and the shaft hole while being press-fitted into the shaft hole. And a shaft provided with a flange portion having an outer diameter larger than the inner diameter of the rotary electric machine rotor, wherein the flange portion and the laminated iron core are formed while the shaft is press-fitted into the shaft hole of the laminated iron core. Is measured in the stacking direction, and when the distance reaches a predetermined value, the press-fitting of the shaft is terminated.

According to the present invention, the shaft is press-fitted into the shaft hole of the laminated iron core while measuring the distance in the laminating direction between the flange portion of the shaft and the laminated iron core, and when the distance reaches a predetermined value, the press-fitting is completed. It is possible to prevent the portion from pressing the laminated core too much and deform the laminated core, and the shaft can be fastened to the laminated core so that no gap is created between the flange portion of the shaft and the laminated core. By fastening the shaft to the laminated core so that no gap is created between the flange portion of the shaft and the laminated iron core, it is possible to prevent insufficient fastening force and unbalance in which the center of gravity of the rotary electric machine rotor is deviated. be able to. In addition, since the distance between the flange of the shaft and the laminated core is measured for each laminated core while the shaft is being press-fitted into the shaft hole of the laminated core, the press-fitting position of the shaft should be determined according to the individual difference in the thickness of the laminated core. Can be adjusted.

FIG. 2A is an exploded perspective view of a shaft and a laminated iron core of a rotary electric machine rotor manufactured by the manufacturing method according to the embodiment of the present disclosure, and FIG. 2B is a perspective view illustrating a state in which the shaft is press-fitted into the laminated iron core. is there. It is a flow chart which shows the manufacturing process of the manufacturing method of the rotary electric machine rotor of the first form. In the method for manufacturing a rotary electric machine rotor according to the first embodiment, a cross-sectional view (a) showing a state in which press-fitting of a shaft is started, a cross-sectional view (b) showing a state in which a shaft is being press-fitted, and a state in which press-fitting has been completed. It is sectional drawing (c) shown. FIG. 6 is a cross-sectional view showing a state in which the shaft is press-fitted too long and the flange portion of the shaft pushes and deforms the laminated core. It is a flowchart which shows the manufacturing process of the manufacturing method of the rotary electric machine rotor of a 2nd form. In the method for manufacturing a rotary electric machine rotor according to the second embodiment, a cross-sectional view (a) showing a state in which press-fitting of a shaft is started, a cross-sectional view (b) showing a state in which the shaft is being press-fitted, and a state in which press-fitting has been completed. It is sectional drawing (c) shown.

<First form>
Hereinafter, a method for manufacturing the rotary electric machine rotor 10 according to the first embodiment will be described with reference to the drawings. As shown in FIG. 1A, the laminated iron core 1 has a cylindrical shape constituted by a plurality of circular magnetic steel sheets 11 that are laminated. The laminated iron core 1 is formed with a shaft hole 12 penetrating in the laminating direction. The shaft 2 serving as the rotation axis of the rotating electric machine rotor 10 is provided with a flange portion 21 having an outer diameter larger than the inner diameter of the shaft hole 12. The outer diameter of the press-fitting portion 22 of the shaft 2 is not uniform, and the outer diameter of the collar portion 21 side is slightly larger. As shown in FIG. 1(b), the collar portion 21 of the shaft 2 has a laminated core. By pressing the shaft 2 into the shaft hole 12 of the laminated iron core 1 until it comes into contact with 1, the press-fitting portion 22 of the shaft 2 is fastened to the laminated iron core 1.

The shaft 2 is press-fitted into the shaft hole 12 of the laminated core 1 by the manufacturing process from step S1 to step S6 shown in FIG. In step S1 of FIG. 2, the laminated iron core 1 is placed on the lower die 3 and the shaft 2 is fixed to the upper die 4, as shown in FIG. The upper mold 4 is provided with a chuck portion for fixing the position of the shaft 2 in the horizontal direction and tightening it. However, in FIG. 3(a), FIG. 3(b), FIG. 3(c) and FIG. Is omitted. The lower die 3 is formed with a hole 31 for avoiding interference with the shaft 2 that is press-fitted.

Next, in step S2 of FIG. 2, measurement of the distance Y in the stacking direction between the flange portion 21 of the shaft 2 and the laminated core 1 is started with a non-contact type distance measuring device such as a laser measuring device. Note that the distance measuring device is omitted in FIGS. 3A, 3B, 3C, and 4.

Next, in step S3 of FIG. 2, as shown in FIG. 3B, the upper die 4 is lowered by a press machine (not shown). As the upper die 4 descends, the shaft 2 is pushed by the upper die 4 from above and press-fitted into the shaft hole 12 of the laminated iron core 1. The distance measuring device continues to measure the distance Y in the stacking direction between the collar portion 21 of the shaft 2 and the laminated core 1 even during the press-fitting of the shaft 2.

Next, in step S4 of FIG. 2, it is determined whether the distance Y between the flange portion 21 of the shaft 2 and the laminated iron core 1 in the laminating direction is larger than a predetermined value 0. When the distance Y measured by the distance measuring device is larger than 0, the process returns to step S3, the upper die 4 is further lowered, and the press-fitting of the shaft 2 is continued. When the distance Y measured by the distance measuring device reaches the predetermined value 0, the process proceeds from step S4 to step S5, and the press machine stops the lowering of the upper mold 4, as shown in FIG. The press fitting of the shaft 2 is completed. That is, at the moment when the distance Y reaches the predetermined value 0, the press machine stops and the press-fitting of the shaft 2 ends. After that, the process proceeds to step S6 in FIG. 2, and the press machine starts to move up the upper die 4.

In order to improve the stop position accuracy of the lowering of the shaft 2, when the distance in the stacking direction between the flange portion 21 of the shaft 2 and the laminated iron core 1 at the time of starting the press fitting is X, the upper die 4 is descending. When the descending distance approaches X, such as when the distance Y measured by the distance measuring device reaches 0.1X, the pressing machine decreases the descending speed. In this way, the press machine uses a servo press in order to change the descending speed and perform precise position control.

As shown in FIG. 4, even if the collar portion 21 of the shaft 2 reaches the laminated core 1, if the shaft is further press-fitted, the collar portion 21 pushes the laminated core 1 too much and the laminated core 1 is deformed.

However, by performing the manufacturing process from step S1 to step S6 shown in FIG. 2, the shaft hole 12 of the laminated core 1 is measured while measuring the distance Y in the laminating direction between the flange portion 21 of the shaft 2 and the laminated core 1. Since the shaft 2 is press-fitted into the shaft 2 and the press-fitting is terminated when the distance Y reaches 0, it is possible to prevent the flange portion 21 of the shaft 2 from excessively pushing the laminated iron core 1 and deforming the laminated iron core 1. The shaft 2 can be fastened to the laminated core 1 so that no gap is created between the core 21 and the laminated core 1. As described above, by fastening the shaft 2 to the laminated core 1 so that there is no gap between the flange portion 21 of the shaft 2 and the laminated iron core 1, the imbalance in which the fastening force is insufficient and the center of gravity of the rotary electric machine rotor 10 is deviated. Can be suppressed. Further, since the distance Y in the laminating direction between the flange portion 21 of the shaft 2 and the laminated core 1 is measured for each laminated iron core 1 during the press-fitting of the shaft 2 into the shaft hole 12 of the laminated iron core 1, the laminated core 1 The press-fitting position of the shaft 2 can be adjusted according to the individual difference in the thickness.

<Second form>
Next, a method for manufacturing the rotary electric machine rotor 10 of the second embodiment will be described. In this form, the shaft 2 is press-fitted and fixed to the laminated iron core 1 exactly the same as in the first form by using the lower mold 3 and the upper mold 4, and only the manufacturing process is different from the first form. In the second embodiment, the shaft 2 is press-fitted into the shaft hole 12 of the laminated core 1 by the manufacturing process from step S11 to step S16 shown in FIG.

Step S11 of FIG. 5 is similar to step S1 shown in FIG. 2 of the first embodiment, as shown in FIG. 6A, the laminated iron core 1 is placed on the lower die 3 and the shaft 2 is placed on the upper die. Fix at 4. 6(a), 6(b) and 6(c) also show the horizontal position of the shaft 2 as in FIGS. 3(a), 3(b) and 3(c). The description of the chuck portion that is fixed and tightened is omitted.

Next, in step S12 of FIG. 5, the distance X in the stacking direction between the flange portion 21 of the shaft 2 and the laminated core 1 is measured by a non-contact type distance measuring device such as a laser measuring device.

Next, in step S13 of FIG. 5, as shown in FIG. 6B, the upper die 4 is lowered by a press machine (not shown). As the upper die 4 descends, the shaft 2 is pushed by the upper die 4 from above and press-fitted into the shaft hole 12 of the laminated iron core 1. The press machine is a servo press, and knows the descending amount Z that descends the upper die 4, and X-Z obtained by subtracting the descending amount Z from the distance X measured in step S12 is the shaft 2 during press fitting of the shaft 2. The distance Y between the collar portion 21 and the laminated iron core 1 in the laminating direction. Therefore, during press-fitting of the shaft 2, the distance Y=X-Z in the stacking direction between the flange portion 21 of the shaft 2 and the laminated core 1 is measured.

Next, in step S14 of FIG. 5, it is determined whether the distance Y=X−Z between the flange portion 21 of the shaft 2 and the laminated iron core 1 in the laminating direction is larger than a predetermined value 0. If the distance Y=X-Z is greater than 0, the process returns to step S13, the upper die 4 is further lowered, and the press-fitting of the shaft 2 is continued. When the distance Y=X−Z reaches the predetermined value 0, the process proceeds to step S15, and as shown in FIG. 6C, the press machine stops the lowering of the upper die 4 and finishes the press fitting of the shaft 2. .. That is, at the moment when the distance Y=X−Z reaches the predetermined value 0, the press machine stops and the press fitting of the shaft 2 is completed. After that, the process proceeds to step S16 in FIG. 5, and the press machine starts to move up the upper die 4.

In this way, by performing the manufacturing process from step S11 to step S16 shown in FIG. 5, the distance Y in the stacking direction between the collar portion 21 of the shaft 2 and the laminated iron core 1 is measured as in the first embodiment. However, when the shaft 2 is press-fitted into the shaft hole 12 of the laminated core 1 and the press-fitting ends when the distance Y=X−Z reaches 0, the flange portion 21 of the shaft 2 pushes the laminated core 1 too much and the laminated core 1 Can be suppressed, and the shaft 2 can be fastened to the laminated core 1 so that no gap is created between the flange portion 21 of the shaft 2 and the laminated core 1. As described above, by fastening the shaft 2 to the laminated core 1 so that there is no gap between the flange portion 21 of the shaft 2 and the laminated iron core 1, the imbalance in which the fastening force is insufficient and the center of gravity of the rotary electric machine rotor 10 is deviated. Can be suppressed. Further, when the press-fitting of the shaft 2 into the shaft hole 12 of the laminated iron core 1 is started, the distance X in the laminating direction between the flange portion 21 of the shaft 2 and the laminated iron core 1 is measured for each laminated iron core 1. The press-fitting position of the shaft 2 can be adjusted according to the individual difference in the thickness of the laminated core 1.

<Supplement to Embodiment>
The method for manufacturing a rotating electrical machine rotor according to the present disclosure is not limited to the above-described embodiment, and can be implemented in various forms within the scope of the gist of the present disclosure. For example, in each of the above-described embodiments, the shaft 2 is moved and press-fitted with the laminated core 1 stopped, but the laminated core 1 may be moved and press-fitted with the shaft 2 stopped. The distance measuring device for measuring the distance in the laminating direction between the flange portion 21 of the shaft 2 and the laminated iron core 1 is not limited to the laser measuring device, and the distance can be measured by photographing the shaft 2 and the laminated iron core 1 with a CCD camera or the like. You may measure.

1 laminated core, 2 shaft, 3 lower mold, 4 upper mold, 10 rotating electrical machine rotor, 11 electromagnetic steel plate, 12 shaft hole, 21 collar part, 22 press fitting part, 31 hole.

Claims (1)

A laminated iron core formed of a plurality of laminated electromagnetic steel plates, and having a shaft hole penetrating in the laminating direction,
A method of manufacturing a rotating electrical machine rotor, comprising: a shaft provided with a flange portion having an outer diameter larger than an inner diameter of the shaft hole while being press-fitted into the shaft hole;
Measuring the distance in the laminating direction between the collar portion and the laminated iron core while press-fitting the shaft into the shaft hole of the laminated iron core,
A method for manufacturing a rotary electric machine rotor, characterized in that the press fitting of the shaft is terminated when the distance reaches a predetermined value.