JPH06106016B2 - Method for manufacturing coil core - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a winding core of a coil used in a quartz timepiece or the like.

[Prior Art] For example, as shown in FIGS. 2 and 3, as a winding core 2 of a coil 1 of a quartz timepiece motor, both ends of a bar material are crushed by a press to form flat surfaces 2a, 2a, There is a motor in which both ends of a stator 3 which is a separate member are screwed to each other to form a motor.

[Problems to be Solved by the Invention] In the above, since both ends of a rod having a circular cross section were pressed as they were to form a flat surface, the area could not be taken very large. Therefore, when the stator and the above-mentioned flat surface are superposed and connected to each other, the contact portion is small and the magnetic flux generated from the coil cannot be efficiently guided to the stator.

This has been one of the reasons why the efficiency of the motor cannot be improved.

The present invention is intended to provide a method for manufacturing a coil core that can efficiently guide the magnetic flux generated from the coil to the stator.

[Means for Solving the Problem] According to the present invention, both ends of a bar material are once crushed toward the center of the longitudinal direction to increase the diameter, and then the both ends are crushed in the thickness direction to form a stator. It is intended to form a flat surface to be joined.

[Example] In FIG. 1, a rod 4 made of a magnetic material and having a circular cross section
(FIG. 1 (A)) is crushed toward the center in the longitudinal direction, and the diameter of both ends is increased as shown in FIGS. 1 (B) and (C). Next, both ends thickened as described above are crushed in the thickness direction as shown in FIGS. 1 (D) and (E), and holes 5 for screwing are opened.

In this way, the flat surfaces 6 and 6 having a large area are formed on both ends of the bar material.
Is formed, the contact portion with the stator is enlarged, and the magnetic flux is efficiently guided.

Moreover, since the area is large, the connection with the stator is not limited to screwing, but caulking, spot welding, and the like are also possible. In this case, since the area is large, caulking and spot welding can be performed in a place unrelated to the magnetic path, and efficiency is not reduced.

The cross-sectional shape of the bar and the shape of the flat surface are not particularly limited.

[Advantages of the Invention] According to the present invention, since the area of the flat surface of the winding core formed from one rod can be increased, a large contact portion to be overlapped with the stator can be taken, and the magnetic flux generated from the coil can be efficiently generated. Can lead to. Therefore, even if the bar is thin, the area of the flat surface can be increased, and the drive efficiency of the motor can be improved.

In addition, the degree of freedom in the method of joining the stator such as spot welding and caulking is increased, and caulking and welding can be performed in a place unrelated to the magnetic path.

[Brief description of drawings]

FIG. 1 is a process drawing showing an embodiment of the present invention, FIG. 2 is a front view showing a conventional example, and FIG. 3 is a right side view of an essential part of FIG. 4 ... bar material 6 ... flat surface

Claims (1)

[Claims] 1. A flat surface that is joined to a stator by crushing both ends of a bar made of a magnetic material toward the center in the longitudinal direction to increase the diameter and then crushing both ends in the thickness direction. A method of manufacturing a winding core of a coil, comprising: