JPS6412004B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for manufacturing a plurality of core materials from a ferromagnetic metal sheet in a state where each of the core materials is connected to a support portion for supporting the plurality of core materials via a connecting portion. The present invention relates to a method for manufacturing a magnetic head in which a plurality of core materials are punched out, then separated from the support portion, and then laminated together to form a head core.

Recently, multiple core materials have been punched out from ferromagnetic metal sheets such as amorphous ferromagnetic alloys.
A method of manufacturing a magnetic head is used in which magnetic heads are laminated together to form a head core. In such conventional methods, for example,
As shown in FIG. 1, each core material 1 is provided with a relatively thin, e.g.
They are punched out while being connected to each other via connecting portions 3 of about mm. Next, each core material 1 is connected to the connecting portion 3
They are each separated from the support portion 2 at the joint portion 4 and stacked on top of each other, and furthermore, in this state, a predetermined polishing for dimensioning is performed to form a head core.

In such a conventional method, each core material 1 and the connecting portion 3 are bonded to each other at a surface used as a reference surface for dimensioning during lamination or polishing, for example, surface 5. However, when each core material 1 is separated from the connecting portion 3, a portion of the connecting portion 3 often remains as burrs on the core material 1, and therefore, the surface 5 on which such burrs remain is used as a reference surface. However, there was a drawback that the dimensional accuracy during lamination or polishing deteriorated.

The present invention has been made in view of these problems, and provides a magnetic head that does not affect the reference surface even if burrs remain as described above, and that allows accurate dimensional accuracy of the head core. The present invention aims to provide a method for manufacturing.

Hereinafter, the present invention will be described with reference to embodiments of FIGS. 2 to 6.

As shown in FIG. 2, each core member 8 having a substantially U-shape is punched out while being connected to a support portion 9 similar to the example shown in FIG. 1 via a connecting portion 10. Such punching can be performed, for example, by pressing, etching, or the like. Each core material 8 is provided with a recess 11, and the core material 8 and the connecting portion 1
0 are connected to each other in these recesses 11.

For example, in the example shown in FIG. 2A, recesses 11 are provided on the outer surfaces 14 and 15 of the extensions 13 that extend laterally from both ends of the main body 12 of the core material 8, respectively. The core material 8 and the connecting portion 10 are connected to each other. On the other hand, connecting part 1
0 has a substantially trapezoidal shape, and is configured to be thick on the supporting portion 9 side and gradually become thinner as it approaches the core material 8. As a result, the connecting portion 10
The part near the core material 8 is easily broken,
In most cases, it is designed to break at the thinnest part, that is, in the vicinity of the joint part 16 with the core material 8.

With such a configuration, the core material 8 is connected to the connecting portion 10.
Even if a part of the connecting part 10 remains on the core material 8 as a burr when it is separated from the core material 8, such burr is inside the recess 11 and does not touch the outer surface 1 of the core material 8.
It does not stand out from 4.15. Therefore, accurate dimensioning can always be carried out using these outer surfaces 14 and/or 15 as reference surfaces.

In the example shown in FIG. 2B, recesses 11 are provided on both side surfaces 17 and 18 of the main body 12 of the core material 8', respectively.
He is trying to couple it to the connecting part 10 in these recessed parts 11. Therefore, even in this case, the side surfaces 17 and 18 of the main body portion 12 can be used as reference surfaces.

The example shown in FIG. 2C is an example in which both the extending portions 13 of the core material 8'' are connected to the connecting portion 10 at the end surfaces 19, 20, and the connecting portion 10 is also connected at the recesses 11 provided in the end surfaces 19, 20. Therefore, in this example as well, the end surfaces 19 and 20 are not affected by burrs, and therefore can be used as reference surfaces.

Each core material 8 punched out from a ferromagnetic sheet as described above is connected to a connecting portion 1 with a connecting portion 10.
Fold at 6 and separate each piece from the support part 9. Then,
A number of core materials 8 necessary to form a predetermined track width are laminated and bonded together. At that time, for example, as shown in FIG.
Using the end surfaces 19, 20 and outer surface 15 of the core materials 8 as reference surfaces, pressure is applied from the direction of the arrow to align the core materials 8 with each other. Then, as shown in FIG. 4, these are pressed from the side to harden the adhesive.

At this time, in this example, since the influence of burrs is prevented by the recess 11, accurate alignment can be performed using the outer surface 15 as a reference surface.

The core material 8 laminated in this way is attached to a core holder 21 as shown in FIGS. 5 and 6, for example.
It is then inserted into the holder and polished to the desired dimensions. As shown in FIG. 6, at this time, the outer surface 14 of the extending portion 13 of the core material 8 and the main body portion 12
The side surfaces 17 of each are used as a reference surface. Even in this case, in this example, the effect of burrs is prevented by the recess 11, so that accurate dimensioning can be performed using the outer surface 14 as a reference surface.

The core material 8 that has been polished for dimensioning is
After the gap forming surfaces 19 are polished as necessary, the left and right sides are combined via a gap spacer.
The head core thus formed is inserted into a predetermined shield case and fixed, and the tape contacting surface is further formed by polishing.

Additionally, the following method may be considered as a method for simplifying the alignment when the core materials are laminated together. That is, the required number of ferromagnetic sheets (for example, Permalloy, Sendust,
amorphous alloy, etc.) and glue them together.
From this, a core material of a predetermined shape is cut out using a wire cut electric discharge. In this way, since each core material is cut out while being stacked on top of the other, manufacturing of the head core becomes very simple.

As explained above, in the present invention, when punching a plurality of core materials from a ferromagnetic metal sheet,
Each core material and the connecting portion are connected to each other in a recess provided in each core material. Therefore, even if a part of the connecting part remains as a burr on the core material when each core material is separated from the supporting part, this burr does not affect the reference plane, and accurate positioning and dimensioning can always be performed. I can do it.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a punched core material according to a conventional example, FIG. 2A is an enlarged plan view showing a punched core material according to an embodiment of the present invention, and FIG. 2B is a plan view showing another embodiment. FIG. 2C is an enlarged plan view similar to FIG. 2A, and FIG.
FIG. 3 is a schematic side view showing the process of laminating and aligning core materials according to an embodiment of the present invention; FIG. 4 is a schematic front view showing the process of bonding the core materials according to the embodiment of the present invention. , FIG. 5 is a schematic perspective view showing a state in which the above core material is inserted into the core holder, and FIG. 6 is a longitudinal sectional view showing the state in which the above core material is inserted into the core holder. In addition, in the symbols used in the drawings, 8... core material, 9... supporting part, 10... connecting part, 11... recessed part.

Claims (1)

[Claims] 1. A plurality of core materials are punched out from a ferromagnetic metal sheet with each of the core materials connected to a support portion for supporting the plurality of core materials via a connecting portion, and then the plurality of core materials are In the method for manufacturing a magnetic head in which a head core is formed by laminating the head cores after being separated from the supporting part, each of the core materials is formed with a recessed part, and each of the core materials and the connecting part are connected to each other in each of the recessed parts. A method characterized in that the plurality of core materials are punched out while being connected to each other.