JPH05325125A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To manufacture a magnetic head with reduced manhour by manufacturing half cores while suppressing fluctuation in gap depth thereby eliminating ranking work according to the gap depth. CONSTITUTION:A core bar 18 is fixed to a machining jig 19 and then cutting of the core bar 18 and regulation of gap depth 25 (determination of apex) are carried out by means of metal bond grinding wheels 21, 22. The metal bond grinding wheels 21, 22 are fixed on a same rotary shaft through predetermined intervals and the metal bond grinding wheel 22 is formed in V-shape at the tip thereof. Winding grooves 27 are then made in the blocks 24, thus cut out to produce a half core. The half core thus constituted has a constant gap depth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a magnetic head used in a flexible magnetic disk device or the like.

[0002]

2. Description of the Related Art In recent years, with the increase in recording density of flexible magnetic disk devices and the like, there is an increasing demand for higher accuracy of magnetic heads.

A conventional method of manufacturing a magnetic head will be described below with reference to FIGS. 2 (a), 2 (b) and 2 (c). Figure 2 (a)
In the figure, 1 is a block of a magnetic core made of an oxide magnetic material such as ferrite, and 2 is a processing jig for positioning the block 1. Block 1 is heat-softening adhesive 3
And the like, and is bonded to the processing jig 2. Next, as shown in FIG. 2B, the processing jig 2 to which the block 1 is bonded is set in a processing machine such as a grinder, and a winding groove 4a is formed by a groove-forming metal bond grindstone 4. Then, as shown in FIG. 2C, the processing jig 2 is set on the table base 5 provided in the cutting machine. A V-shaped groove 6 is formed in the table base 5 at an angle A. In the processing jig 2, the bottom surface 2a of the processing jig 2 is in contact with the slope 6a forming the groove 6, and moreover, the side surface 2b of the processing jig 2 is in contact with the slope 6b forming the groove 6. It is set on the table base 5. In the block 1 of the magnetic core set in such a tilted state, the slope 8 is mirror-ground with the resinoid grindstone 7 having an L-shaped tip.

The core half thus processed is shown in FIG. In FIG. 3, 9 is a half core, 10 is a front gap facing surface, 11 is a back gap facing surface, 12 is a gap depth, and the gap depth 12 is the width of the facing surface 10, that is, between the apex 13 and the medium facing surface 14. It becomes the distance.

FIG. 4 is a side view showing a magnetic head manufactured using the core half body 9. In FIG. 4, reference numeral 15 denotes a core half body made of an oxide magnetic material such as ferrite. The core half body 15 is butted against the core half body 9 through a magnetic gap 16 and bonded to each other with a bonding glass 17. There is. A coil 18 is wound around the core half body 9.

[0006]

However, in the above-mentioned conventional method, the gap depth 12 shown in FIG. 3 varies, and therefore the gap depth 12 must be measured and ranked after the core half body 9 is manufactured. However, there was a problem that the man-hour increased. As can be seen from FIG. 2, the variation in the gap depth 12 is considered to be due to a mounting error when the device is reset in the device during the process of forming the winding groove 4a and the slope 8 for forming the apex. ..

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a method of manufacturing a magnetic head which can eliminate the step of ranking and reduce the number of steps.

[0008]

In order to achieve this object, the present invention performs the step of forming a groove that determines the apex of the cut body at the same time as cutting the core bar.

[0009]

With this structure, the gap depth can be kept constant.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1A, 1B and 1C are side views showing a method of manufacturing a magnetic head. In FIG. 1A, 18 is a core bar made of an oxide magnetic material with ferrite, 19 is a processing jig for positioning the core bar 18, and the processing jig 19 is provided with a plurality of grooves 19a at predetermined intervals. Has been. The core bar 18 is bonded to the processing jig 19 via the heat softening adhesive 20 or the like. Next, in FIG. 1B, the processing jig 19 is set on a processing machine such as a grinder,
The metal bond grindstone 21 for cutting and the metal bond grindstone 22 for slope grinding simultaneously process cutting and slope grinding for determining apex. At this time, metal bond grindstone 2
1 and the metal bond grindstone 22 are attached to the same rotary shaft (not shown) so that the distance between them is constant.
The tip of the metal bond grindstone 22 is V-shaped so that a slope can be formed. Further, the tip of the metal bond grindstone 21 is designed to enter the groove 19a provided in the processing jig 19 in order to cut the core bar 18 into a predetermined size. By this processing, the core bar 18 is made into
Gap depth 2 at the same time as cutting into block 24 of
The regulation of 5, that is, the groove processing for determining the apex is performed at the same time. Then, in FIG. 1 (c),
In FIG. 1B, the processing jig 19 to which the processed block 24 is adhered is set again, and the winding groove 27 is processed by the multi-groove processing metal bond grindstone 26 to produce the core half body. As shown in FIG. 4, the core halves are abutted with other cores via a magnetic gap and bonded to each other with a bonding glass to manufacture a magnetic head.

As described above, in this embodiment, the step of cutting the block 24 and the step of forming the groove for regulating the gap depth 25 (the step of determining the apex) can be carried out at the same time. A large number of core halves can be produced, and there is no need to perform gap depth ranking. Therefore, man-hours are reduced and productivity is improved.
Further, the gap depth 25 can be freely changed by controlling the cut amount of the metal bond grindstone 22 into the core bar 18. On the contrary, if the depth of cut is always constant, the gap depth can always be constant. Furthermore, the gap depth 25 is the metal bond grindstone 2
It can also be changed by setting the tip shape of 2, that is, the tip angle to a predetermined angle. It goes without saying that these items need to be changed appropriately according to their specifications (type of magnetic head, etc.).

In this embodiment, in consideration of the deformation of the grindstone due to wear, the cutting metal bond grindstone 21 and the multi-groove metal bond grindstone 400 have 400 mesh, and the sloped metal bond grindstone 22. To 2500
A grindstone made of 3000 mesh diamond abrasive grains was used.

In this embodiment, the tip shape of the metal bond grindstone 22 is V-shaped, but the same effect can be obtained even if the front end valley shape is another shape such as a round shape or a square shape.

[0014]

According to the present invention, since the gap depth can be always made constant by performing the step of forming the groove that determines the apex of the cut body simultaneously with the cutting of the core bar, the gap depth can be ranked. Since it is not necessary to carry out, it is possible to reduce the man-hours.

[Brief description of drawings]

1A is a side view showing a method of manufacturing a magnetic head according to an embodiment of the present invention, FIG. 1B is a side view showing a method of manufacturing a magnetic head according to an embodiment of the present invention, and FIG. Side view showing a method of manufacturing a magnetic head in one embodiment

2A is a side view showing a conventional magnetic head manufacturing method, FIG. 2B is a side view showing a conventional magnetic head manufacturing method, and FIG. 2C is a side view showing a conventional magnetic head manufacturing method.

FIG. 3 Side view of core half

FIG. 4 is a side view of the magnetic head.

[Explanation of symbols]

 18 core bar 19 processing jig 21 metal bond grindstone 22 metal bond grindstone

Claims (1)

[Claims] 1. At the same time as cutting the core bar to a predetermined length,
A method of manufacturing a magnetic head, characterized in that a groove for determining an apex is formed in the cut body to manufacture a core half body, and the core half body and another core half body are bonded together via a magnetic gap.