JPS58139325A - Manufacture for magnetic core - Google Patents

Abstract

PURPOSE:To reduce the processing man-power and the material cost, by cutting off thin plates in a prescribed track width after a lot of plates having a dispersion are laminated and bonded. CONSTITUTION:A core block is sliced at a width close to the specified width and the sliced blocks are laminated and bonded to form a block 5. The block 5 is cut off at a prescribed track width T to obtain a magnetic core 6 comprising a plurality of laminated thin plates 4. The plate thickness of the magnetic thin plate 4 arranged by butting the magnetic cores 6 is different from each other, the entire thickness is equal to the width of a track width and the number of sheets is the same for the left and the right. The magnetic core obtained in this way does not require the accuracy of plate thickness at slicing and rolling and no wrapping processing for the arrangement of the plate thickness is required.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a magnetic core, and more particularly to a method of manufacturing a magnetic core formed by laminating and bonding a plurality of thin plates of high magnetic permeability magnetic material.

2. Description of the Related Art Magnetic heads in which a magnetic core is formed by laminating and bonding a plurality of thin plates of high magnetic permeability magnetic material have been known. Such a magnetic head attempts to improve magnetic and rad characteristics by reducing eddy current loss by increasing the number of laminated thin plates made of high permeability magnetic material.

However, as the number of laminated thin plates of magnetic material increases, precision in the thickness of each plate is required. In particular, when Sendust is used as a high permeability magnetic material, a core block 1 having the same cross-sectional shape as the core is sliced to a predetermined thickness t, as shown in Fig. 1, and then multiple pieces are laminated and bonded. As shown in Fig. 2, the magnetic core 3 cannot be achieved by slicing, and the plate thickness must be controlled by lapping, etc. after slicing. Increased man-hours,
This has the disadvantage that breakage occurs during processing, resulting in poor yield and high cost.

In particular, when the thickness of a thin plate is less than 0*15 mm, the above-mentioned slicing process becomes a problem, and slicing becomes difficult and variations in plate thickness accuracy become large, and the lapping process to obtain a predetermined plate thickness is time-consuming. Therefore, the cost inevitably increases, and a magnetic core made by laminating these,
Therefore, there is a drawback that the cost of the magnetic head increases significantly.

The present invention was made in order to eliminate the above-mentioned drawbacks of the conventional method, and it is a low-cost method that exhibits the same characteristics as the conventional method by bonding multiple layers of magnetic material without worrying about the thickness accuracy of thin plates of magnetic material. It is an object of the present invention to provide a method for manufacturing a magnetic core that enables a magnetic head to be obtained.

In the present invention, in order to achieve the above object, - a block is formed by laminating and bonding a large number of thin plates of high permeability magnetic material with variations in plate thickness, and this block is cut according to a predetermined track width to form a magnetic core. We adopted a method to obtain The details of the method of the present invention will be explained below.

In the present invention, first, the core block 1 shown in FIG. 1 is sliced to a width close to a predetermined width. The width ta at this time is not exactly the desired width t, but includes variations during slicing. The width obtained in this way 1. Thin plates with variations in thickness are laminated and glued together as shown in Figure 3 to form Hibiki block 5.
shall be. This laminated thin plate is designated by the reference numeral 4. As mentioned above, this thin plate 4 has variations in thickness, but because it has been subjected to a predetermined slicing process, the thickness is doubled. There is no large variation, and it remains within a predetermined range.

Next, the block 5 thus obtained is cut at a predetermined lower track width to obtain a magnetic core 6 made of a plurality of laminated thin plates 4, as shown in FIG. FIG. 5 shows a partially enlarged view from the gap side when the magnetic cores sequentially cut in this manner are assembled and the magnetic head is closed.

As is clear from FIG. 5, the magnetic cores 6.6 are arranged butted against each other, and the thickness of the magnetic thin plates 4 that constitute each of them varies, but the overall thickness is equal to the track width. , and the magnetic thin plate 4 was cut in the middle.
The number of sheets on the left and right sides, including , is the same. In FIG. 5, the reference numeral 7 indicates a spacer for forming a magnetic gap.

The magnetic core obtained in this way does not require precision in the thickness of the material during slicing or rolling, eliminates the need for processing such as lapping to make the thickness uniform, and allows for easy lamination and bonding of multiple thin plates. This reduces machining man-hours and material costs. In particular, the effect is greater as the number of laminated sheets increases, and it is possible to improve characteristics and significantly reduce costs.

By the way, the above explanation is about a method of manufacturing a magnetic core using a thin plate obtained by slicing a core block, but high permeability magnetic materials manufactured by rolling or molten metal rolling can also be processed in the same way. For example, a magnetic core in which a plurality of thin plates are laminated can be easily manufactured without requiring processing precision during rolling.

As is clear from the above description, according to the present invention, when manufacturing a magnetic core formed by laminating thin plates made of a high permeability magnetic material, a large number of thin plates with varying thicknesses are laminated and bonded. This method uses a method in which a magnetic core is obtained by cutting the block into a block according to a predetermined track width, so even if the thickness of the thin plates varies, a predetermined number of thin plates can be laminated and the eddy current Loss can be reduced, and a magnetic head with excellent characteristics can be manufactured very easily and at low cost.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views of a core block and the obtained magnetic core, illustrating the conventional manufacturing method, and Figure 3 and the following illustrate the method of the present invention. FIG. 4 is a perspective view of a block made of laminated and bonded thin plates, FIG. 4 is a perspective view of a magnetic core obtained by cutting, and FIG. 5 is a partially enlarged front view of the assembled magnetic core as seen from the gap side. . 1... Core block, 2, 4... Magnetic thin plate, 3, 6
...Magnetic core, 5...Block, 7...Spacer.

Claims (1)

[Claims] A method for manufacturing a magnetic core, which comprises manufacturing a magnetic core by laminating and bonding a large number of thin plates of high permeability magnetic material with varying thicknesses to form a block, and cutting this block into a predetermined track width. .