JPS63141306A - Manufacture of electromagnetic machine - Google Patents

Abstract

PURPOSE:To enhance the durability of a pressing mold, to prevent the irregularity of voids, and to improve the productivity of the title electromagnetic machine by a method wherein, in a core-structure manufacturing method in which T-type core C or E is punched out successively after a hoop material is first punched out from a scrap, the shape of scrap from which the hoop material will be punched out is specifically formed. CONSTITUTION:A scrap 22 is punched out from a hoop material 21 by a pressing machine in a work stage I. Then, in the next work stage II, a T-type core 13 is punched out from the hoop material 21 by the pressing machine. The T-type core 13 is formed in the width wider than the inner width H between the bases of both scrap protruded parts 22b, the T-type core 13 bas the width J which is narrower than the outside width I between the tips of the scrap protruded part 22b, and the shape of center leg 16 is formed by the punched hole X of the scrap 22. In the work stage III, a C-type core 12 is punched out from the hoop material 21 by the pressing machine. Through these procedures, each of T-type and C-type core punched out from the same hoop material 21 is laminated and fixed in the prescribed number of sheets, and the C-type core 12 and the T-type core 13 are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing an iron core structure for electrical equipment such as a ballast for a discharge lamp.

[Conventional technology]

FIG. 7 shows a conventional core structure of an electromagnetic device, which is made up of a combination of a C-shaped core 1 and a T-shaped core 2. As shown in FIG.

In this core structure, a stepped portion 4 is provided on the inner surface of the tip end of the pair of side legs 3 of the C-shaped core 1. The T-shaped core 2 is press-fitted into the C-shaped core 1 by aligning its end surfaces 2a with the inner surfaces 3a of the end portions of the side legs 3, and is fixed inside the C-shaped core 1. is positioned by coming into contact with the stepped portion 4. Through this assembly, a gap 7 is formed between the distal end surface of the center leg 6 of the T-shaped core 2 and the C-shaped core 1 facing this surface.

This gap 7 is for obtaining predetermined characteristics in the electromagnetic device, and its width a is as narrow as about 0.2 to 0.4#.

Each of the above-mentioned iron cores 1 and 2 is formed by laminating iron core plates punched out of hoop material by press working.

In the above-mentioned pressing process, conventionally, the core plates of the core 1.2 were punched out one after another from the same hoop material as shown in FIG. 8. In FIG. 8, the punched portion is shown with diagonal lines in order to easily distinguish the punched portion from other portions.

In other words, if the arrow in Fig. 8 is the feeding direction of the hoop material, then at the work stage indicated by ■ in the figure, first,
Punch out the T-shaped iron core 2. Next, at the work stage shown by ■ in FIG. 8, a scrap d whose inner surface is cut out at a portion corresponding to the center leg of the punched hole C of the Tung-shaped core 2 is punched out. This scrap d is the core 1 when the above-mentioned iron cores 1 and 2 are combined.
．． Coil installation gap 8 formed between 2 (see Figure 7)
It is formed from a pair of main scrap parts d1 corresponding to , and a bridge part d2 provided over these parts.

The outer width e between the double scrap parts d1 is a little smaller than the width f of the T-shaped core 2, and the bridge part d2
The width Q is equal to the width a of the gap 7. This scrap d
The stepped portion 4 is formed by punching. In addition, by punching in the above order, even though the bridge portion d2 corresponding to the gap 7 is narrow, there is no need to provide a narrow part in the press die, and as a result, the durability of the press die in work stage ① can be improved. . It should be noted that if the punching in the work stage (2) is performed before the work stage (E), the durability of the press die will deteriorate. Finally, at the work stage shown by ■ in Figure 8,
A C-shaped core 1 whose inner surface is shaped by the punched hole C of the T-shaped core 2 and the punched hole of the scrap d is punched out.

[Problem that the invention seeks to solve]

The T1 iron core 2 obtained in the above manner has C
Although it is assembled by press-fitting into the square core 1, there is a problem that the dimensions of the gap 7 tend to vary due to the following reasons, despite the presence of a step 4 that positions the square core 2 during press-fitting. there were.

In other words, although each core of 1°2 is obtained by the press working described above, the corners of the press mold always have a roundness commonly called a radius. Therefore, as shown macroscopically in FIG. 9, a radius r is inevitably formed in the stepped portion 4 of the C-shaped core 1 and in both end corners 5 of the T-shaped core 2, depending on the roundness of the press die. However, not only can it not be guaranteed that these radiuses r are exactly the same, but also the manner in which the press dies wear out differs from one another. If the size of the radius r between the stepped portion 4 and the corner portion 5 does not match accurately, when the E-shaped core 1 and the T-shaped core 2 are combined, the stepped portion 4 will be damaged as shown in FIG. The corner portion 5 and the corner portion 5 do not come into contact with each other, and an extremely small gap is formed between them. That is, this gap reduces the width a of the gap 7.
It varies.

Such variations in the width dimension of the gap 7 are caused by the fact that even if the above-mentioned gap is extremely small, for example, about o, o5+tm, the width a of the gap 7 itself is about 0.2 to 0.4 m. , is extremely large at 25% to 12.5% with respect to the air gap 7, and has a very large influence on the characteristics of the impeller. For this reason, in the past, when assembling the iron cores 1 and 2, it was necessary to perform the troublesome work of adjusting the width dimension of the gap 7.

Therefore, an object of the present invention is to provide a method for manufacturing an electric press molding machine that does not impair the durability of the press mold and that can prevent variations in the gap and improve productivity.

Means for Solving Problem C) The present invention comprises a C-shaped or E-shaped iron core having a pair of side legs, and a T-shaped iron core that is press-fitted into this iron core and combined. between the tip surface of the center leg and the surface of the C-shaped or E-shaped core that faces the T-shaped core center leg tip surface,
It is applied in a method of manufacturing electromagnetic equipment that is assembled with a gap.

In the manufacturing method of the present invention, the shape of the scrap punched into the hoop material is shaped into the coil installation space formed by the C-shaped or E-shaped core and the T-shaped core when these cores are combined. A pair of corresponding main scrap parts, a scrap convex part for forming a stepped part and an escape groove, which are connected outwardly to the outer corner parts of the tips of the hoop material feeding direction of these main scrap parts, and the scrap parts. The width of the convex part is increased by the width along the length of the hoop material, and the bridge part for forming the gap is formed between the pair of main scrap parts. The scrap is first punched into the hoop material. After this, a central leg is formed by a punched hole in the scrap, having a width greater than the inner width between the roots of the two scrap protrusions and smaller than the outer width between the tips of the scrap protrusions. The upper ET-shaped core to be removed, and the C-shaped or E-shaped core whose inner surface is shaped by the punched holes of this T-shaped core and the punched holes of the scrap are punched out of the hoop material (
. Next, after attaching the winding to the center leg of the T-shaped core, align the end surfaces of both sides of the T-shaped core with the inner surfaces of the side leg tips of the C-shaped or E-shaped core, and then The T-shaped iron core faces the relief groove cut out by the cut-out marks of the scrap convex part on the inner surface of the tip of the side leg, and the T-shaped iron core touches the stepped part cut out by the cut-out marks. [Operation] According to the method of the present invention, the hoop material is first handled with scraps. The bridge portion in this scrap has a width corresponding to the gap between the iron cores and an extra width of the scrap convex portion for forming the stepped portion and relief groove, and is wider than the width equivalent to the gap. Therefore, even though scrap is punched out first, the press mold can be made to last longer. Next, a T-shaped core and a C-shaped or E-shaped core are punched out from the same hoop material.

Along with this punching, a step is formed based on the relationship between the width of the T-shaped core and the inner and outer widths of the scrap convex portion, and an escape groove connected to this step is formed on the side leg. It is arranged outside the inner surface of the tip.

After this, the T-shaped core with the winding attached to the center leg is press-fitted inside the C-shaped or E-shaped core to assemble.

Then, both end corners of the T-shaped core face the relief grooves of the C-shaped or E-shaped core, and at the same time, the T-shaped core is positioned by contacting the step part of the core, and at the same time, the end face of the center leg and the C-shaped core Alternatively, a gap of a predetermined width is formed between the E-shaped core and the E-shaped core.

By the way, an escape groove is formed on the outside of the inner surface of the tip of the side leg due to the extraction marks of the scrap convex portion, and is connected to the tip of the stepped portion. The radius formed at both end corners of the T-shaped core remains separate from each other and does not interfere with each other, so regardless of the size of these radii, both end corners and step portions of the T-shaped core can be brought into contact without any gaps. can be done.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

First, the core structure of an electric insulator as a ballast for a discharge lamp shown in FIGS. 1 and 2 will be explained. This core structure consists of a C-shaped core 12 having a pair of side legs 11, and 12 and a T-shaped iron core 13 combined with the iron core 12.

Note that 12a is a convex portion. , each core 12.13 is formed by 81 layers of a large number of core plates, and
These cores 12 and 13 define a coil installation space 14. The coil 15 housed in this space 14 is
It is attached to the central leg 16 of the T-shaped core 13. center leg 1
A gap 17 is provided between the tip surface of the C-shaped core 12 and the tip 12b of the C-shaped core 12, which faces the tip surface of the central leg 16. @A of the void 17 (see Figure 2) is 0.2 to 0.4
It is about m. The width B of the coil arrangement space 14 and the width C of the portion facing it (I!l!a11) are the same, and the ID of the central leg 16 is set to be twice the widths B and C.

In addition, the width E of the tip of the side leg 11 is smaller than the width C of the portion facing the coil arrangement space 14, and a stepped portion 18 is formed at the culm portion of the inner surface. The T-shaped iron core 13 has its both ends m-plane 13a on the side 11111.
It is press-fitted in line with the inner surface 11a of the tip end, and
The corner portions 19 at both ends are positioned by abutting against the stepped portion 18 . By this positioning, the width A of the gap 17 is regulated to a predetermined dimension. Furthermore, a relief groove 20 is formed on the tip end side of the side leg 11 and is connected to the step 8ilis, so that the corner portion 19 of the T-shaped core 13 can be stepped without being interfered with by the corner portion 20a of the relief groove 20. It is adapted to be brought into contact with the portion 18.

Electric Ia with the above configuration! Each core 12゜13 used in
The iron core plate is made using a press machine as shown in Fig. 3, ■, ■.
Each of the work stages shown in is lightly punched out from the same hoop material as follows. In addition, 2 in Figure 3
Reference numeral 1 denotes a hoop material made of a dielectric steel plate or the like, and its moving direction is indicated by an arrow, and punched parts in the figure are shown with diagonal lines to make it easier to distinguish them from other parts.

In the work stage, the scrap 22 is punched out from the hoop material 21 by a press machine. As shown in FIG. 3, the shape of the scrap 22 is a pair of main parts corresponding to the coil installation space 14 formed by the C-shaped core 12 and T-shaped core 13 when these cores 12 and 13 are combined. Scrap part 22a
and the hoop material 21 in these main scrap parts 22a.
It is formed, for example, in a C-shape by scrap convex portions 22b that are connected outwardly at the outer corners of the leading end in the feeding direction, and a bridge portion 22C that is provided across the pair of main scrap portions 22a. The scrap convex portion 22b is for forming the step portion 18 and the relief groove 20. The bridge portion 22c is for forming the void 17, and its vAF is equal to the width of the void 17 by the width G along the length direction of the hoop material 21 of the escape groove 20 formed by the handling marks of the scrap convex portion 22b. It is formed extra larger than A. Note that the width G is empty g in this example.
Although it is smaller than the width A of A17, it goes without saying that it is not limited thereto. In punching this scrap 22, the portion corresponding to the gap 17 between the cores 12 and 13 is
It is not the width A itself, but the width G of the scrap convex portion 22b corresponding to the relief groove 20 that is already combined with the extra width, making it as wide as F-(A+G), so that the life of the press mold can be extended. I can do it.

In the next work stage ■, the T-shaped iron core 13 is
From step 1, it is pressed using a press machine. The T-shaped iron core 13 has a width J that is larger than the inner width H between the roots of both the scrap protrusions 22b and smaller than the outer width I between the tips of the scrap protrusions 22b. The center m16 is shaped by the handling hole X.

In work stage (2), C-shaped iron r612 is punched out from the hoop material 21 using a press machine. The C-shaped core 12 is punched out using the punching hole X of the scrap 22 and the punching hole Y of the T-shaped core 13.

A predetermined number of T-shaped and C-shaped core plates punched from the same hoop material 21 as described above are laminated and fixed to form a C-shaped core 12 and a T-shaped core 13.

Next, after attaching the coil 15 to the center leg 16 of the T-shaped core 13, this T-shaped core 13 is press-fitted, and the center leg 16 of the T-shaped core 13 is press-fitted.
Then, the coil 15 is placed inside the C-shaped core 12 and assembled. In this case, the T-shaped core 13 has both end surfaces 13
a to the inner surface 11a of the tip end of the side leg 11 of the C-shaped core 12, so that both end corners 19 of the T-shaped core 13 are cut out by the handling marks of the scrap protrusion 22b. l! It faces I20 and is press-fitted until it hits the stepped portion 18.

In this press-fitting, the radius of the corner] 9 and the radius of the corner 20a of the clearance groove 20 are out of position and do not interfere with each other, so even if the size of the 100 radius is the same,
Also, even if they do not match, the step portion 18 and the corner portion 19
and are securely abutted without forming a gap between them due to the size of the radius. Therefore, T
The positioning of the core 13 becomes accurate, and the surface 12b of the C-shaped core 12 and the end surface of the central leg 16 of the T-shaped core 13 form a gap 17 of a predetermined width B regardless of the dimension corresponding to the width G.

In the above order! The core structure of i-equipment is assembled.

In addition, in the present invention, if the C-shaped core 12 has a structure in which the convex portion 12a cannot be touched, a pair of scraps corresponding to the convex portion 12a is removed together with the scrap 22 at the work stage as shown in FIG. Hoop material 21 at the same time
There is no problem in punching out the T-shaped core 13 and the C-shaped core 12 together using the same press machine in the work stage (2). Of course, all other steps are the same as in the above embodiment.

Furthermore, the present invention can be applied to electromagnetic equipment having a core structure assembled with an E-shaped core 31 and a T-shaped core 13, as shown in FIGS. 5 and 6. This embodiment differs from the above embodiment in that the iron core 31 has an E-shaped structure.
After punching out the H-shaped scrap 22 using a pair of main scrap parts 22a, a scrap convex part 22b connected thereto, and a bridge 22C connecting the main scrap parts 22a, a T-shaped core 13 and an E-shaped core 31 are punched out. was obtained by punching out the same hoop material 21, and the rest is the same as in the above embodiment.

〔Effect of the invention〕

According to the present invention, the gist of which is the structure described in the above claims, a C-shaped or E-shaped core and a T-shaped core are punched out of the same hoop material, and the inside of these C-shaped core or E-shaped core is The T-shaped iron core is press-fitted into the inner core and fixed, and the T-shaped iron core is positioned by the step part to form a gap between the inner cores. Despite punching, the life of the press mold can be extended. At the same time, due to the punching marks of the scrap protrusions to increase the durability of this press die, regardless of the size of the radius of the punching marks and the radius of the corners of both ends of the T-shaped core, the corners of both ends of the T-shaped core are Since the gap between the inner cores can be formed to an accurate width by bringing the stepped portions of the side legs of the C-type or E-type core into close contact with each other, the gap adjustment work during press-fitting can be omitted. Although it cannot be omitted, it can be made extremely easy.Therefore, process control can be improved and productivity can be improved.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention, with Figure 1 being a plan view showing the C-shaped core and T-shaped core being assembled, and Figure 2 showing the assembled C-shaped core and the T-shaped core. Top view of T-shaped core,
FIG. 3 is an explanatory diagram showing punching of a C-shaped core and a T-shaped core from hoop material. FIG. 4 is an explanatory diagram showing another punching mode of the C-shaped core and the T-shaped core. 5 and 6 show other embodiments, FIG. 5 is a plan view of an assembled E-shaped core and a T-shaped core, and FIG. 6 is a plan view of an assembled C-shaped core and a T-shaped core made of hoop material.
A plan view of the C-shaped core, Figure 8 shows the C-shaped core made from hoop material and the T-shaped core.
FIG. 9 is an explanatory view showing the punching of the shaped iron core, and is an enlarged view of the section ``■'' in FIG. 7. 11... Side leg, 11a... Inner surface of the tip of the side leg, 12
... C-shaped core, 12b... Surface, 13... T-shaped core, 13a... Both end surfaces of T-shaped core, 14... Coil distribution space, 15... Coil, 16...・Central leg,
17...Void, 18...Step, 19...Corner, 2
0... Relief groove, 21... Hoop material, 22... Scrap, 22a... Main scrap part, 22b... Scrap convex part, 22c... Bridge part, A... Width of gap , H...Inner width, I...Outer width, G...Width of scrap convex portion, X, Y...Punching hole, 31...E-shaped core. Applicant's Representative Patent Attorney Takehiko Suzue Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] A C-shaped or E-shaped iron core having a pair of side legs, and a T-shaped iron core that is press-fitted into this iron core and combined, the tip surface of the central leg of the T-shaped iron core and the above-mentioned In a method for manufacturing electromagnetic equipment in which a gap is provided between a C-shaped or E-shaped core and a surface opposite to the top surface of the central leg of the T-shaped core, the shape of the scrap punched into a hoop material is changed to the above-mentioned C shape. Or, a pair of main scrap parts corresponding to the coil installation space formed by these cores when an E-shaped core and the T-shaped core are combined, and a tip end in the hoop material feeding direction of these main scrap parts. A scrap convex portion for forming a stepped portion and an escape groove is provided outwardly in each outer corner, and the width of the scrap convex portion is increased by the width along the length direction of the hoop material. , and a bridge part for forming the gap provided between the pair of main scrap parts, and after first punching a scrap of this shape into the hoop material, the inner width between the roots of both the scrap protrusions is The T-shaped core has a central leg formed by a punched hole in the scrap, and the T-shaped core has a width that is larger than the outer width of the scrap convex portion and smaller than the outer width between the tips of the scrap protrusions. The C-shaped or E-shaped core, the inner surface of which is shaped by the punched holes of Align the end surfaces of both sides of the T-shaped core with the inner surface of the end of the side leg of the above-mentioned C-shaped or E-shaped core, so that the corners of both ends of the T-shaped core are aligned with the inner surface of the end of the end of the side leg, making sure that the scrap convex portion remains intact. A method of manufacturing an electromagnetic device, characterized in that the T-shaped iron core is assembled by press-fitting the T-shaped core until it faces the relief groove cut out by the groove and comes into contact with the stepped part cut out by the cutout trace.