JPH0622375B2 - Sequential feed mold device for iron core manufacturing of rotating electric machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a progressive die apparatus for manufacturing an iron core of a rotary electric machine such as a fixed iron core of a stepping motor.

(Prior Art and Problems) In order to improve the electric characteristics of a fixed iron core for a rotary electric machine, as shown in FIGS. 3 to 4, a pole (pole tooth) T of an iron core plate T ₀ is used.
_Iron core ₁ of the front end only teeth _{T 2} of the so bent outward is shown for example in Japanese Unexamined Utility Model Publication No. 52-151306.

Conventionally, when manufacturing an iron core having this bent and formed tooth portion T _2, for example, the iron core having a slot or the like press-processed is separately bent later, and then laminated and welded and fixed. There was a problem of low productivity and high cost.

Further, when the tooth portion is bent like the above-mentioned iron core, or when the iron core is bent at the same time as the outer diameter punching and laminated as disclosed in JP-A-59-50752, when the teeth are bent, Since the inner diameter is deformed inward and the dimensional accuracy of the inner diameter is reduced, the gap between the inner diameter of the rotor and the rotor used will vary and cannot be maintained properly, resulting in uneven electrical characteristics of the motor. It is a factor that causes or decreases.

(Object of the invention) Therefore, the present invention is proposed in order to solve such a conventional problem, the bending process necessary for forming the tooth portion in the series of steps by the progressive die device is performed on the outer circumference of the inner diameter. In addition to the above, the bending means deforms the inside diameter to a predetermined dimensional accuracy by finishing the inside diameter during the process, and then the bending means is provided with a tooth groove to form a tooth portion. An object of the present invention is to provide a progressive die device for manufacturing an iron core of a rotating electric machine disposed inside.

(Means for Solving the Problem) In the progressive die device for manufacturing the iron core of the rotating electric machine according to the present invention, the strip is intermittently run between the upper die and the lower die for each step, and a predetermined punching process is performed on the strip. In addition to sequentially performing, in the progressive die device that manufactures the iron core of the rotary electric machine by sequentially stacking the iron cores whose outer diameter has been finally removed, the upper die and the lower die have inner diameter removed in the previous step in the die device. With respect to the strip punched with the slot punching, a bending forming means for providing a concentric bending forming portion on the outer periphery of the inner diameter, an inner diameter finishing removing means for correcting the inner diameter after the bending forming, and an inner diameter finishing punching Inner diameter tooth groove removing means for providing a tooth portion in the bending portion is arranged before the outer diameter removing and laminating caulking step.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in Figs. 1 and 2.

FIG. 1 is an explanatory view showing a processing step by a progressive die device of the present invention, where FIG. 1 (A) is a plan view of a strip (strip-shaped thin plate) 1 which is an iron core material, and FIG. 1 (B) is the same. Figure (A)
A front view in which a part of the strip inside is cut away, and FIG. 6C is an explanatory view of the processing content applied to the strip 1 in each step.

Further, FIG. 2 is an elevation view in which a part of the progressive die device for carrying out the processing step of FIG. 1 is cut away.

In FIG. 1, a strip 1 having a pilot hole 1a is intermittently run along a longitudinal direction indicated by an arrow, and in a first step (1), a process for removing an inner diameter is performed, for example, a round hole 2
Is formed.

Next, in step (2), slot punching is performed to form a plurality of slots 3 around the round hole 2. In addition,
The portion left between the slots 3 is the pole (polar tooth) T
₁ (see FIG. 3).

Next, in step (3), the portion left between the slots 3 described above, that is, the end of the pole T ₁ closer to the round hole 2 is subjected to a bending process, and is outwardly bent as shown in FIG. 1 (b). Can be folded. Note that this bending may be performed at a time, but in this embodiment, in order to facilitate the bending, the primary bending is performed in the step (3) and the bending is performed in the step (4). Secondary bending is performed.

Next, in step (5), the protruding portion 4 is punched out for crimping at the time of stacking, in step (6) internal finish punching, that is, round hole 2 is finished, and then step (7). In (), the protrusions 5 for laminated crimping are punched out.

Next, in step (8), the inner diameter tooth groove is removed to form the tooth portion T ₂ (see FIG. 3) at the tip of the portion (pole T ₁ ) between the slots 3 described above and The tip portions of the respective poles T ₁ to be cut are separated from each other.

The next step (9) is idle (play) without processing.
It is a process.

In the final step (10), although the laminated caulking-out outer径抜is performed, the core plate T ₀ by the outer diameter vent is formed, the core plate T ₀ is previously outside diameter vent was made core plate (Fig. (Not shown), and the laminated caulking projection 5 is fitted into the punching hole of the laminated caulking projection of the iron core. After that, the core plates whose outer diameter has been removed are integrated one after another by the caulking projections.

Next, details of the progressive die apparatus used for carrying out the above-described processing steps will be described with reference to FIG.

The mold apparatus 20 is composed of an upper mold 21 and a lower mold 22 which are respectively arranged above and below the traveling path of the strip 1.

The upper die 21 has an inner diameter punch 23 for inner diameter punching in the step (1), a slot punching punch 24 for slot punching in the step (2), and a bending punch 25 for bending in the step (3). A pressing pin (not shown) for bending in step (4), a punch (not shown) for punching the protrusion in step (5), and step (6).
An inner diameter finishing punch 26 for performing inner diameter finishing punching in step 1, a punch (not shown) for punching out stacked caulking projections in step (7), and an inner diameter tooth groove punching punch 27 for performing inner diameter tooth groove cutting in step (8). An outer diameter punching / laminating crimping punch 28 for carrying out outer diameter punching / laminating crimping in step (10) is sequentially arranged from the inlet side to the outlet side of the strip 1.

Further, the lower die 22 has an inner diameter punch 2 in the step (1).
Die 23a corresponding to step 3, die 24a corresponding to slot punching punch 24 in step (2), die 25a receiving bending punch 25 in step (3), step (4)
, A die corresponding to the secondary bending punch (not shown), a die corresponding to the punch in step (5) (not shown), and a die 26a corresponding to the inner diameter finishing punch 26 in step (6).
And a die corresponding to the punch in step (7) (not shown)
The die 27a corresponding to the inner diameter tooth groove punching punch 27 in the step (8) and the die 28a corresponding to the outer diameter punching / laminating caulking punch 28 in the step (10) are introduced from the inlet side to the outlet side of the strip 1. They are arranged in order.

The cushion pressing pin 25b slidably penetrates into the bending punch 25 arranged in the step (3), and the cushion pressing pin 25b is urged by the spring 25c to the side of the lower mold cushion 25d. It has been pressed. The cushion 25d is arranged in the die 25a, and the upper mold pin 25b is formed by the pin 25f supported by the spring 25e.
Pushed to the side. The spring 25c is the spring 25
The spring force is set to be stronger than that of e. When the bending punch 25 is bent, the cushion 25d is pressed downward by the cushion pressing pin 25b, and the core plate is pushed up by the force of the spring 25e after the bending. The die 25a is prevented from being clogged.

Further, the die 28a arranged in the step (10) is
A rotary ring 31 is provided integrally with the rotary laminating apparatus 30, and a pulley 32 is provided around the rotary ring 31. Although not shown, the pulley 32 is configured to interlock with a pressing mechanism via a timing belt, an index device, etc., and can rotate the rotating ring 31, that is, the outer diameter cutting die 28a by a required angle.

A gear may be used instead of the pulley 32, and the gear may be connected so as to be linked with the press mechanism.

By rotating the outer diameter cutting die 28a, the iron core may be skewed or rotated by 90 ° or 180 ° for each predetermined number of laminated layers to eliminate the plate thickness deviation. The iron core thus laminated by a predetermined number of sheets is discharged onto the conveyor 33 and taken out, for example.

In the progressive die apparatus having the above configuration, the strip 1 is supplied from the inlet side between the upper die 21 and the lower die 22, and the upper die 2
When 1 is lowered, the processing from the steps (1) to (10) is performed at once.

Further, when the upper die 21 is raised, the strip 1 on the lower die 22 is intermittently transferred by one step, and the same operation is repeated to perform the working operations in all steps.

(Effect of the Invention) In the progressive die apparatus according to the present invention, after the bending necessary for forming the tooth portion is performed on the outer circumference of the inner diameter, the tooth groove is provided in this bending portion to form the tooth portion. It is possible to easily form a tooth portion that improves electric performance such as reducing iron loss.

Also, since the inner diameter finish cutting is done after bending,
It is possible to correct the deformation of the inner diameter that occurs during bending and to obtain a predetermined inner diameter dimensional accuracy, and to make the gap with the rotor that is inserted into this inner diameter uniform and improve the electric performance of the motor.

Furthermore, since a series of operations including bending and punching of the inner diameter are continuously performed by one progressive die device, productivity can be significantly improved and cost can be significantly reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a working process using a progressive die apparatus according to an embodiment of the present invention, in which FIG. 1 (A) is a plan view of a strip which is a material of an iron core, and FIG. 1 (B). Is a front view in which a part of the strip in FIG. 1 (A) is cut away, FIG. 2 (C) is an explanatory view of processing in each step, and FIG. 2 is a progressive die apparatus for carrying out the processing step of FIG. FIG. 3 is a plan view of a known fixed iron core plate which is a manufacturing target of the progressive die apparatus of the present invention, and FIG. 4 is a sectional explanatory view of the iron core plate of FIG. . [Explanation of Codes] 1 ... Strip, 1a ... Pilot hole 2 ... Inner diameter (round hole), 3 ... Slot 4 ... Projection part, 5 ... Stacking caulking projection 20 ... Sequential feed mold device 21 ... … Upper mold, 22 …… Lower mold 23 …… Inner diameter punching punch 23a to 28a …… Die 24 …… Slot punching punch 25 …… Bending forming press pin 26 …… Inner diameter finishing punch 27 …… Inner diameter tooth groove punching 28 …… Outer-diameter laminated laminating caulking punch 30 …… Rotary laminating device, 31 …… Rotary ring 32 …… Pulley, 33 …… Conveyor T ₀ …… Core plate, T ₁ …… Pole T ₂ …… Tooth part

Claims (1)

[Claims] 1. A strip is intermittently run between an upper die and a lower die in each step, and a predetermined punching process is sequentially performed on this strip, and finally, iron cores having an outer diameter are sequentially laminated. In a progressive die device for manufacturing iron cores of rotating electrical machines, the upper die and the lower die are concentrically bent to the outer periphery of the inner diameter with respect to the strip that has undergone inner diameter punching and slot punching in the previous step in the die equipment. Bending forming means for forming a forming portion,
After the bending, the inner diameter finishing punching means for correcting the inner diameter and the inner diameter tooth groove punching means for providing the tooth portion in the bending molding portion after the inner diameter finishing punching are respectively provided before the outer diameter punching / lamination caulking step. A progressive die device for manufacturing an iron core of a rotary electric machine, which is characterized by being arranged.