JPS6149902B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing magnetic members made of magnetic materials, such as coil cores and stators used in converters such as quartz watches.

Conventionally, a pair of stators integrated by a support plate constituting a magnetic circuit of a converter for a quartz watch, and a connecting portion with a coil winding core around which a coil is wound, are implanted in a main plate 1 as shown in Fig. 1. A stator 3 and a coil 4, which are made by press working from a strip of a certain thickness and are integrated by a support plate (not shown), are wound around a tube 2, which is made by the same process as the stator 3. The cores 5 were simply inserted in a stacked manner and then fixed with screws 6. However, with this structure, when the converter is driven, a driving current flows through the coil 4 and the coil winding core 5
The magnetic flux generated within the connection portion 5 (indicated by arrow A)
The magnetic flux A flows into the stator 3 at point a, but since the stator 3 and the coil core 5 have a simple laminated shape, the magnetic flux A is bent at right angles in the vertical direction. If the magnetic flux A is bent at right angles in this way, it will lack the straightness which is the original property of the magnetic flux, so it is natural that the end face 5b of the coil winding core 5
Since a large amount of leakage magnetic flux (indicated by arrow B) is generated, this has the disadvantage of causing deterioration of the characteristics of the converter.Furthermore, since the connecting portion 5a overlaps the stator 3 and the coil winding core 5, the thickness This has disadvantages such as increasing the thickness of the watch, making it difficult to make the watch thinner.

In order to eliminate the above-mentioned drawbacks, the present invention makes only the connecting part between the stator and the coil core thinner, reduces leakage magnetic flux, and is easy to process and mass-producible. This is what we are trying to provide.

Embodiments of the present invention will be explained below with reference to the drawings in the case of a coil winding core. In Figs. In order to form a temporary end portion 5c, which is a thin-walled portion similar to the shape of the connecting portion 5a of the coil winding core 5, using a guide hole 8 for processing, a window 9 is created by press working. Next, as shown in FIG. 4, the coil core 5 is received by the member 10 from below, and the coil winding portion 5d of the coil core 5 is pressed by the member 11 from above, and then the member 12 is pushed down in the direction of arrow D. By applying pressure, the thickness of the temporary end portion 5c of the coil winding core 5 is reduced, thereby forming a thin portion, as shown in FIG. 3.

At this time, the member 12 has a larger area than the temporary end 5c, and since the window 9 is provided around the temporary end 5c, the material of the temporary end 5c pushed by the member 12 is moved in the plane direction. As a result, the planar area of the temporary end portion 5c increases. On the other hand, the coil winding part 5
Since the portion d is pressed down by the members 10 and 11, it is not affected by the pressure applied by the member 12 at all, and its thickness is the same as that of the other portions of the strip material 7.

Note that when applying pressure with the member 12, if the member 12 is vibrated and pressurized, the flatness of the temporary end portion 5c becomes better. All of the above machining is performed with reference to the guide hole 8, so that sufficient precision in the plane direction can be obtained.

Thereafter, as shown by the solid line in FIG. 5, the hole 13 of the connecting portion 5a and the outer shape of the coil winding core 5 are punched out by press working, using the guide hole 8 as a reference, and as shown in FIG. 6, only the connecting portion 5a is punched out. Thus, a coil core 5 with a thin thickness is completed.

Although the above explanation has been made regarding the coil winding core, it is clear that if the same processing steps are adopted for the stator, it is possible to create a stator with a thinner thickness only at the connecting portions, just like the coil winding core.

FIG. 7 shows an example of the connecting portion when the coil core and stator created according to the above explanation are actually incorporated into the movement. The stator 3 has a through hole 3b in the thin connecting portion 3a. A stepped pin 14 made of a magnetic material is loosely inserted into the through hole 3b, and the connecting portion 5a of the coil winding core 5 around which the coil 4 is wound is pushed into the stepped pin through the hole 13 and fixed. has been done. Therefore, the stator 3 and the coil core 5 are integrated by a stepped pin 14 made of a magnetic material. Furthermore, stepped pin 1
4 is inserted into the guide hole 1a of the main plate 1, and the stator 3 and the coil winding core 5 are positioned. , is fixed to the base plate 1 with screws 15.

If such a structure is adopted, the magnetic flux generated in the coil winding core 5 can travel in a straight line, so leakage magnetic flux is reduced, and the stepped pin 14 is made of magnetic material at the connection part.
Since the magnetic resistance of the magnetic circuit made up of the stator 3 and the coil winding core is reduced, the characteristics of the converter are improved and the area of the connecting portion can be reduced.

As described above, according to the present invention, a stator and a coil winding core with only a thin connection portion can be easily manufactured.
Since it can be processed with high precision and can be processed continuously, it has the advantage of being low cost and suitable for mass production, improving the characteristics of the converter, and reducing the thickness of the connection part. Therefore, it has a great effect on making watches thinner.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view illustrating a conventional connection structure between a stator and a coil core, and FIGS. 2, 3, and 4 are plane views illustrating a method for manufacturing a coil core according to an embodiment of the present invention. Figure 5 is C-C in Figure 3.
A sectional view, FIG. 6 shows a coil winding core made according to an embodiment of the present invention, FIG. 6 a is a plan view, and FIG. 6 b
7 is a side view, and FIG. 7 is a partial cross-sectional view of a connecting portion showing an embodiment in which a coil core and a stator manufactured according to an embodiment of the present invention are attached to a movement. DESCRIPTION OF SYMBOLS 1... Base plate, 3... Stator, 5... Coil winding core, 7... Band material, 8... Guide hole, 5c... Temporary end of coil winding core 5, 9... Window, 10, 11... …
Part for presser foot.

Claims (1)

[Claims] 1. In a method of manufacturing a magnetic member for a converter, which forms a localized thin-walled portion at a connecting portion between a magnetic member and another magnetic member, a step of forming a guide hole in a plate material made of a magnetic material, and a step of forming a guide hole as a reference for the guide hole. a process of punching out a window around the thin-walled part while leaving a thin-walled part as a base; a process of forming the thin-walled part by press working on the thin-walled part; and a process of finishing the outer shape of the magnetic member with reference to the guide hole. 1. A method of manufacturing a magnetic member for a converter, comprising the step of processing.