JPS59198853A - Removing method of burr of slot of laminated core - Google Patents

Abstract

PURPOSE:To simultaneously remove burrs of a slot of a core by one action by inserting and pressing an arcuate projection with a collar at the root from opposite side of pressing at the slot of the core when a core is laminated to form a core. CONSTITUTION:A projection 5 is allowed to coincide with the state of a slot 2, and supported at a collar filling support 6. The projection 5 of this jig is press- fitted from the end face of the core which is produced with burrs 4 to the slot 2. The shape of the projection 5 coincides with the slot 2, but the projection 5 is slightly smaller than the slot 2 and the burrs 4 of the core 1 are contacted and compressed to the position of the projection 5 to form an arcuate R. Therefore, the jig (projection 5) can be smoothly press-fitted to the slot 2 of the core by the external force P. In this manner, the burrs 4 can be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention originates in slot portions of a laminated core formed by punching. Concerning how to remove burrs.

For example, slots for winding windings around the rotor of a rotating electric machine are punched out at the same time as the individual silicon steel plates (core) forming the laminated core are punched out. At this time, burrs form on one end surface of the core with slots.

In the conventional method, the core was coated with an electrical insulator or the insulator was melted and inserted to form an insulating film, without removing the burrs formed in the slot portion of the core. However, these methods tend to weaken the insulation in the burrs, resulting in poor dielectric strength.

Here, the present invention overcomes the difficulties of the conventional method and removes the burrs in the slot portions of the laminated core at once using a simple jig when the cores are laminated to form the core. Its purpose is to provide a method.

Now, the present invention will be explained in order according to the drawings.

FIG. 1 is a perspective view of the formed laminated core, FIG. 2 is a front view thereof, and FIG. 3 is a side sectional view of the core.

1 is a core constituting a laminated iron core, 2 is a slot portion around which an electric conductor is wound, 3 is a hole for inserting a rotating shaft, and 4 is a burr produced when punching the core. Note that A is the major axis of the slot portion 2.

Such a burr 4 has a sharp edge and is most unfavorable in terms of insulation.

Therefore, in one embodiment of the present invention, the following jig is used.

FIG. 4 is a side view of one protrusion of the jig, FIG. 5 is a front view thereof, and FIG. 6 is a perspective view of the entire jig.

The protrusion 5 is intended to crush the burr 4, and its long axis (width corresponding to the above A) is the length thereof, and the base of the protrusion has an arc R over its entire circumference.

The arc R is set to satisfy the following relationship.

These protrusions 5 are made to match the shape of the slot portion 2 and are supported by the collar portion, that is, the support portion 6.

In the present invention, the protrusion 5 of this jig is inserted and press-fitted into the slot portion 2 from the end face of the laminated core where the burr 4 has occurred.

The press-fit state is shown in a side sectional view in FIG. 7 and a perspective view in FIG. 8.

Although the shape of the protrusion 5 corresponds to the slot portion 2,
As mentioned above, the protrusion 5 is slightly smaller than the slot portion 2,
In addition, since an arc R is formed at the portion of the protrusion 50 that is compressed by the burr 4 of the core 1, the jig (protrusion 5) can be inserted and press-fitted into the slot portion 2 of the laminated core by external pressure P. It is done smoothly.

Through this process of removing the burrs 4, the burrs 4 are removed and a round, smooth surface 40 suitable for inserting and winding the conductor into the slot portion 2 is created, as shown in the side sectional view of FIG. Ru.

8. If the present invention is implemented when inserting the insulating material into the slot portion 2, the insulation can be easily and smoothly performed without the insulating material getting caught on the burrs 4.

Thus, according to the present invention, the burrs that inevitably occur during core punching are completely removed after the laminated core is formed, making the subsequent machining process for the slot portions easier and smoother, and improving the insulation properties of the slot portions of the laminated core. can be significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the shape of the laminated core, Fig. 2 is a front view of the laminated core, Fig. 3 is a side sectional view of a part of the core showing the slot portion, and Fig. 4 is an embodiment of the present invention. FIG. 5 is a side view of one protrusion in the example, FIG. 5 is a front view thereof, FIG. 6 is a perspective view showing the form of a jig provided with a large number of protrusions, and FIG. FIG. 8 is a perspective view showing the state of the laminated core and jig at that time, and FIG. 9 is a side sectional view of a part of the laminated core after implementing the present invention. DESCRIPTION OF SYMBOLS 1... Core, 2... Slot part, 3... Rotating shaft hole, 4... Core burr, 5... Protrusion, 6... Protrusion support part (flange part), 40... - Burr removal section. Applicant's agent Kiyohiro Inomata Figure 1 Figure 2 Figure 6 Ushi Figure 5 Figure 7 Figure 3 Figure 4 Figure 9

Claims (1)

[Claims] A laminated iron core having a slot on the outer circumference or the inner circumference and formed by laminating a plurality of press-cut steel plate iron cores is inserted into the slot from the side opposite to the press-cut side with the same shape as the slot, slightly smaller, and an appropriate amount at the root. A method for removing burrs in a slot portion of a laminated core, the method comprising: inserting and pressurizing a protrusion with a flange having a circular arc to remove burrs on the outer periphery of the slot.