JPS6022449A - Heat treating method of stator core - Google Patents

Abstract

PURPOSE:To prevent a laminated and secured stator core from deforming due to a heat treatment by securing the core to a jig for preventing the core from deforming, and then heat-treating the core. CONSTITUTION:A stator core 1 is formed by laminating punched stator cores 2 and engaging caulking projections 5 formed at the punching time of the core 2. The core 1 is heat treated in the state secured by bolts 7 to a mounting base jig 6. Thus, even if the forming stress of the projections 5 secured simultaneously upon laminating of the core 2 is released at the heat treating time, the core 1 is not almost deformed. The clamping force of the bolt 7 is substantially the same as that of the bolt 9 mounted at a mounting frame 8, and even if the core 1 is removed from the jig 6, the core 1 is returned to the state heat treated by the jig 6 when the core is secured by the bolt 9 to the frame 8, and no correction is necessary. In this manner, the deformation of the core due to the heat treatment can be prevented.

Description

[Detailed description of the invention] Industrial application field The present invention relates to a method for heat treating a stator core.

(b) Prior art The conventional example is explained based on FIGS. 1 to 3. (1
) is a stator core, and this stator core is made by laminating stator cores (2) formed by stamping electromagnetic steel sheets, and then caulking the laminated cores together to fix them together, or
Alternatively, it is formed by welding and fixing the outer wall of the stator core (2).

The laminated and fixed stator core (1) is decarburized by heat treatment, and an oxide film is formed on the surface of the stator core (2). After this heat treatment, a winding (3) is wound around the stator core (1) to form a stator (4).

In this stator core heat treatment method, the laminated and fixed stator core (1) is heat treated to remove strain in the fixed portions due to caulking or welding, and deformations such as twisting, falling, and distortion occur in the core. This deformed stator core is modified and then wound with a winding (3).

Furthermore, if the stator core (1) is significantly deformed by heat treatment, such as torsion, collapse, distortion, etc., it cannot be completely corrected even with correction processing, making it impossible to incorporate it into a product. In view of the above points, the purpose of the present invention is to prevent deformation of the stator core due to heat treatment.

B) Structure of the Invention The basic structure of the present invention is that the laminated and fixed stator core is heat-treated after being identified to a jig for preventing deformation of the core.

In this stator core heat treatment method, the laminated and fixed stator cores are heat treated while being fixed to a jig.

Although the fixed portion of the stator core is deformed by this heat treatment, this deformation is suppressed by being fixed to the jig. Moreover, when removed from the jig, this deformation changes the perpendicularity of the stator core due to the elastic force of the stator core itself. However, such deformation is such that when the stator core is fixed to a mounting frame of a compressor or the like, it returns to the state it was in when it was mounted on a jig and heat-treated, so that it can be mounted to the extent that no modification is required.

(E) Example Below This invention will be explained based on the example shown in FIGS. 4 to 8. (1) is a stator core, and the stator core is a stator core made by punching an electromagnetic steel plate ( 2) are laminated, and at the same time, caulking protrusions (5) formed during punching of the stator core (2) are fitted together. (6
) is a mounting base jig that shows the perpendicularity and flatness of the plane on which the stator core (11 is mounted) with high precision.The stator core (11 is attached to the mounting base jig (6) with bolts Heat treatment is performed in this state.

(3) is a winding, which is wound around the stator core (1) which has been removed from the heat-treated mounting base jig (6) to form the stator (4).

In the heat treatment method for the stator core configured as described above, the stator core (1) is attached to the mounting base jig (6) with bolts (
Heat treatment is performed in the fixed state in step 7). For this reason,
Even if the forming stress of the caulking protrusions (5), which are fixed at the same time as the stator core (2) is laminated, is released during heat treatment, the stator core (1) will hardly twist or fall when it is fixed with the bolts (7). And no deformation such as distortion is observed. Additionally, the tightening force of the bolts (7) that fix the stator core (1) to the mounting base jig (6) is approximately the same as the tightening force of the bolts (9) that are attached to the mounting frame (8) of the compressor, etc. −. As a result, when the stator core (1) is removed from the mounting base jig (6), the perpendicularity changes due to the elastic force of the stator core (2), but the bolts (9) are attached to the mounting frame of the compressor, etc. 8), it returns to the state it was in when it was attached to the mounting base jig (6) and heat-treated, and it can be mounted to such an extent that no modification is required.

Therefore, the stator core (1) can be attached to the attachment frame (8) without any modification after heat treatment.

Moreover, in the heat treatment method of the present invention, the mounting base jig (6
), which involves the process of attaching the stator core (1), but this process can be automated, and productivity is significantly improved compared to a modification process that cannot be automated due to large variations in the deformation of the stator core (1). .

In the above explanation, the stator core (1) is laminated and fixed with the caulking projections (5), but the stator core (2)
After laminating the stator core (1), deformation of the stator core (1) can be similarly prevented by fixing the outer wall of the stator core (1) by welding or by a combination of caulking and welding.

(F) Effects of the Invention The stator core heat treatment method of the present invention is such that the laminated stator core is fixed to a jig and then heat treated to prevent deformation of the stator core due to this heat treatment. Therefore, modification processing of the stator core after heat treatment can be omitted. Furthermore, in the conventional heat treatment method, the deformation of the stator core due to heat treatment varies greatly, making it difficult to automate the modification process. It allows the manufacturing process of iron cores to be automated.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional examples, where Figure 1 is a plan view of the stator core, Figure 2 is a perspective view of the stator core, and Figure 3 is a sectional view of the stator core deformed after heat treatment. , FIG. 4 to FIG. 8 illustrate this invention, FIG. 4 is a perspective view of the stator core, and FIG. 5 is a perspective view of the stator core.
The figure is a sectional view taken along the line ■-v in FIG. 4, FIG. 6 is a perspective view showing the state in which the stator core is attached to the mounting base jig, and FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6. FIG. 8 is a sectional view showing a state in which the stator is attached to the mounting frame. (1)...Stator core, (2)...Stator core,
(6)...Mounting base jig. Applicant: SANYO Electric Co., Ltd., and one other representative: Patent attorney Seibu Sano, -, s m @ ,,,. □ Fig. 6 b 1' /A I//J

Claims (1)

[Claims] 1. After stacking and fixing the stamped stator cores, heat treatment is performed.In the stator core, the stacked and fixed stator core is fixed to a jig that prevents deformation of the core, and then heat treated. A method for heat treatment of a stator core, characterized in that: