JPS5926182B2 - How to make press rings for rotating electric machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a press ring for a rotating electric machine.1. An object of the present invention is to provide a method for manufacturing a press ring that enables continuous cutting during molding by IC automatic gas cutting, improves the efficiency of processing work, and shortens the construction period.

As is well known, press rings are installed at both axial ends of the stator and rotor of a rotating electric machine to tighten an iron core made of a laminated body of thin steel plates.

This press ring is very thick compared to the thin steel plate of the iron core, and a 25 mm thick steel plate is used as -fl.

The thin steel plate of the iron core requires precision in forming and is thin in thickness, so it can be cut by press, but the press ring cannot be cut by press.

For this purpose, press rings are generally processed and formed by gas cutting.

Moreover, since the precision of the stator and rotor is provided by the iron core, the processing accuracy of the press ring is not required to be as high as the one shown above, and the required precision can be obtained even with gas cutting processing.

On the other hand, as shown in Fig. 1, the press ring of the stator has a rotor hole 2 in the center of the press ring 1, a hanging common hole 3 in the upper part, and frame holes 4 etc. around the periphery to support the reinforcing pipe frame of the stator. A machined hole is formed.

As shown in FIG. 2, the press ring of the rotor has a shaft hole 6 formed in the center of the press ring 5, and a plurality of machined holes such as ventilation holes 7 in the circumferential direction.

Processing by gas cutting is carried out as follows.

That is, as shown in FIG. 3, a model 9 is prepared in which a design plan of the press ring is drawn for the raw steel plate 8 to be gas-cut in advance, and the press ring shape of this model 9 is followed by automatic cutting. A steel plate 8 is cut and formed using a gas cutting machine 1.

The automatic gas cutting machine 10 includes a detection mechanism 11 that uses a phototube or the like to automatically track and detect the drawing along the processing line, a burner 12 for gas cutting, and a burner 12 that follows the detection signal of the detection mechanism 11. It consists of a control device 13 that moves the.

The detection mechanism 11 automatically and continuously traces continuous machining lines on the drawing 9 to perform gas cutting, but it cannot perform gas cutting on discontinuous machining lines on the drawing. In this case, the gas burner 12 is stopped and the detection mechanism 11 is manually turned off.
After setting it on the new processing line, turn on burner 1 again.
It is necessary to relight 2 and process.

This manual operation is extremely tedious and requires a large amount of interruption time in the cutting operation.

Moreover, the conventional press ring 1 shown in FIGS. 1 and 2,
5, there are many machined holes that are independent machining lines, so in actual gas cutting, in addition to the external machining process A and the internal machining process B, separate processes are performed for each hole 3 and 4.7. Hole machining processes C, D, and E are required.

As is clear from this, an extremely large number of processing steps are required to gas-cut the press rings shown in FIGS. 1 and 2, and the burner 12 must be stopped and restarted between each step. Manual setting of the ignition and detection mechanism 11, etc. was required, and processing efficiency was low and the construction period was long, including labor-intensive cutting work interruption time.

An object of the present invention is to provide a method for manufacturing a press ring that can improve the efficiency of gas cutting in contrast to the conventional method for manufacturing a press ring.

In order to achieve this object, the present invention provides that all of the machined holes provided in the press ring, such as holes for hanging tools, reinforcing frame holes, ventilation holes, etc. is continuously machined so that a part of the machined hole is opened at the outer periphery of the stator press ring and at the inner periphery of the rotor press ring,
Each of the machined holes forms a continuous loop along with the external or internal processing line, so that gas cutting can be performed continuously in one step along this loop.

Next, embodiments of the present invention will be described with reference to the drawings.

In the stator press ring 1 shown in FIG. 4, each of the machined holes such as the hanging hole 3 and the reinforcing frame hole 4 is a gas cutting groove formed as a cut groove from the outer peripheral edge 1A of the press ring 1. A communicating opening is provided to the outer peripheral edge 1A via 3A and 4A.

In the rotor press ring 5 shown in FIG. 5, a ventilation hole 7 is opened to communicate with an inner peripheral edge 6A as an edge of the shaft hole 6 of the press ring via a gas cutting groove 7A.

In the press ring having the above configuration, when gas cutting the raw steel plate 8 using the automatic gas cutting machine 1 shown in FIG. 4A, the machining line including each of the machined holes 3 and 4 is drawn as one continuous loop. Therefore, in one contour machining step A, the contour of the press ring 1 and each of the machined holes are drawn continuously along the loop. Can be used for gas cutting.

In addition, in the rotor press ring 5, the processing line including the inner peripheral edge 6A, the gas cutting groove 7A, and the processing hole 7 is drawn as one continuous loop, and therefore, the processing line is drawn as one continuous loop.
The inner shape of the press ring 5 and the machined hole 7 can be continuously gas-cut along the loop.

That is, automatic gas cutting process A. It only takes B twice,
Comparing the cutting operation interruption time for resetting the detection mechanism 11, stopping the burner, and reigniting the burner, the number of processing steps can be significantly reduced compared to the conventional method shown in FIGS. 1 and 2. The production period can be shortened.

Of the machined holes, the gas cutting grooves 3A and 4A are opened on the outer periphery of the suspension hole 3 and reinforcing frame hole 4, so the mechanical strength against the load is somewhat reduced, but depending on the position of the machined hole and the gas A press ring whose thickness is slightly different depending on the shape of the cutting groove can sufficiently withstand the lifting load and the tightening load of the reinforcing frame.

In the case of a press ring for a stator, since a part of the machined hole is opened at the outer peripheral edge, the inner peripheral edge has no strength to press the core in the axial direction due to the opening. This does not impair the ability of the press ring to effectively press down on the root of the groove in the stator core, which is the most important part to press.

In addition, in the press ring for a rotor, since a part of the machined hole is opened at the inner periphery, the strength of the outer periphery to press the iron core in the axial direction is reduced due to the opening, and therefore the stator As in the case of , the function of the press ring to effectively press down on the rotor core is not impaired.

In particular, in the case of press rings for rotors, the inner circumferential edge is held in the axial direction by the flange of the shaft mounting part or a component with an equivalent function, so the opening in the inner circumferential edge not only does not reduce the function of the press ring in any way, but also Internal stress due to far-flooding and force accompanying the rotation of a ring-shaped object is greater in the circumferential direction of the inner circumference than in the circumferential direction of the outer circumference, and is especially greater as the difference between the inner and outer diameters increases. Therefore, the opening has a great effect of increasing the rotational strength of the press ring.

As described above, according to the present invention, when manufacturing a press ring by gas cutting, the number of gas cutting processes can be reduced, and the manufacturing period can be significantly shortened, which has advantages that greatly contribute to reducing manufacturing costs. It is possible to provide a method for manufacturing a press ring for a rotating electric machine.

[Brief explanation of the drawings] Figures 1 and 2 are front views of the stator press ring and rotor press ring manufactured by conventional methods, Figure 3 is an explanatory diagram of automatic gas cutting processing, Figure 4, FIG. 5 is a front view of a stator press ring and a rotor press ring manufactured according to the present invention. 1: Stator press ring, 1A: Outer rim, 3: Hole for lifting tool, 4: Reinforcement frame hole, 5: Rotor press ring 6: Shaft hole, 6A: Inner rim of shaft hole, 7: Ventilation hole , 3A , 4A ,
7A: Gas cutting groove.

Claims (1)

[Claims] 1. When producing a press ring with machined holes such as hanging holes, ventilation holes, reinforcing frame holes, etc. by gas cutting, the machined holes are machined continuously after the gas cutting process of the outer or inner peripheral edge of the press ring. However, for the machined holes whose outer shape is not continuous with the outer circumferential edge or the inner circumferential edge, gas cutting grooves are formed on the outer circumferential edge of the stator press ring and the inner circumferential edge of the rotor press ring. A method for manufacturing a press ring for a rotating electrical machine, characterized in that continuous gas cutting is performed by opening it through a press ring.