JPS6236478A - Method of bonding - Google Patents

Abstract

PURPOSE:To prevent nonuniform bonding and slippage through reduction of the thickness of a bonding layer to substantially zero, by forming a thin film at one end of the bonding surface of at least one out of two solid members, placing the bonding surfaces of both members opposite each other to form a wedgy space between the bonding surfaces and pouring an adhesive into the space. CONSTITUTION:Two solid members 1, 2 are bonded with an adhesive using a step of forming a thin film 3 at one end of the bonding surface of at least one solid member (e.g., 2) selected from the both solid members, a step of placing the two solid members 1, 2 opposite each other in such a manner that the bonding surface on which the thin film 3 is formed is arranged on the inside to form a wedgy space 8 between the bonding surfaces, and a step of pouring an adhesive into the space 8. For example, a groove 4 which serves as an adhesive pouring port may be formed around the thin film 3 of the bonding surface of the solid member 2. According to the title bonding method, mass bonding can be conducted at once with a predetermined jig. Further, what is needed after bonding is only to cut off the unnecessary portion such as the groove 4. Therefore, there is no need to reprocess the bonded members due to the slippage caused during the bonding.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of bonding two solid members such as ceramics to each other with an adhesive such as glass or resin.

[Conventional technology]

For example, when manufacturing a magnetic head, two solid members, ie, a head core material made of a ferromagnetic material and a slider material made of a nonmagnetic material, are bonded together with resin. In the obtained magnetic head, since the bonded line intersects the magnetic recording medium rotating at high speed on the sliding surface in the perpendicular direction, the resin, which is harder than the head core material and the slider material, is worn away.

This causes the recording medium to be damaged by the nip between the head core material and the slider material, and dust accumulates in the gap created by the abrasion, which obstructs the running of the recording medium. For this reason,
It is preferable that the thickness of the resin adhesive layer on the sliding surface of the head be approximately zero.

Conventionally, in order to make the adhesive layer thinner, resin is applied to the adhesion surfaces of the head core material and the slider material, and the two are rubbed together in most cases.

[Problem that the invention seeks to solve]

However, according to this method.

1) Must be glued one by one.

2) Misalignment is likely to occur between the herad core material and the slider material.

3) Adhesion unevenness is likely to occur.

4) The adhesive layer does not become too thin. (Average 0.8μ or more).

There are problems such as.

Therefore, it is an object of the present invention to provide a bonding method that eliminates these problems.

[Means for solving problems]

According to the present invention, in the method of joining two solid members with an adhesive, the step of forming a thin film on one end of the joining surface of at least one of the two solid members;
The method includes the steps of: abutting the two solid members against each other with the bonded surfaces on which the thin film is formed inside, forming a wedge-shaped gap between the bonded surfaces; and injecting an adhesive into the gap. An adhesive method is obtained which is characterized by:

〔Example〕

FIG. 1 shows a bonding method according to an embodiment of the present invention for manufacturing a head block of a magnetic head. Here, the head block of the magnetic head is one that includes a head core material made of a ferromagnetic material and a slider material made of a nonmagnetic material.

Referring to FIG. 1, first, a first solid member 1 made of a ferromagnetic material and a second solid member 2 made of a non-magnetic material are prepared. The first solid member 1 is processed into a herad core material. The second solid member 2 is processed into a slider material. The opposing joint surfaces of these solid members 1 and 2 are mirror-finished.

Prior to adhesion, a thin film 3 of 5i02 having a thickness of about 5 μm is formed only on one end of the joint surface of the second solid member 2 by vapor deposition or sputtering. A groove 4, which will serve as a resin injection port, is still formed in the vicinity of the thin film 3 on the joint surface of the second solid member 2. Note that the thin film 3 and the groove 4 may be provided on the joint surface of the first solid member 2, or may be provided on the joint surfaces of both the first and second solid members 1 and 2, respectively.

Next, the first and second solid members 1 and 2 are butted against each other with the joint surfaces on which the thin film 3 is formed facing inside, and set in a predetermined jig. The jig used has a horizontal surface 7 that supports the solid members 1 and 2, and clamping means that can apply a pressing force F to the solid members 1 and 2.

A wedge-shaped gap 8 is formed between the first and second solid members 1.2 which are butted against each other. However, the gap 8 between the solid members 1 and 2 is extremely narrow because the thickness of the thin film 3 is small. Therefore, the bottom surfaces of solid members 1 and 2 are
It can be considered that it almost coincides with the horizontal plane 7. Further, the wedge-shaped gap 8 becomes extremely small (substantially zero) at the lower end.

In this state, the epoxy resin is injected from the groove 4 while the solid members 1 and 2 are held between them by pressure force F from the sides. The injected resin flows into the wedge-shaped gap 8 by capillary action. Thereafter, the resin is solidified at a predetermined time and temperature.

After that, it is cut along the cutting line 5 and the unnecessary part 9 above it is cut. That is, the portions where the thin film 3 and grooves 4 are provided are removed. In this way, a head block of a magnetic hend in which the head core material and the slider material are fixed to each other with resin is obtained.

According to the above-described bonding method, a large amount of bonding can be done at once by setting it on a jig and injecting resin without requiring the labor of aligning the slides and the like. Furthermore, the mutual misalignment between the herad core material and the slider material is eliminated, and the step of applying finishing processing after adhesion is also eliminated. In addition, a wedge-shaped gap 8 is formed by the vapor deposited film.
Since the width of the adhesive layer is controlled, the adhesive layer has an average value of 0.1μ or less with a standard deviation of 0.05μ or less on the sliding surface, which is close to zero, and the upper part has a constant chi A' depending on the deposited film thickness. −. Also, since no coating method is used, uneven adhesion is less likely to occur.

In the above-described embodiment, epoxy resin is injected into one gap 8 for bonding, but instead of that.

Other adhesives such as glass or phenolic resins may also be used. Furthermore, it goes without saying that the composition of the thin film 3 and the method for forming it are not particularly limited.

〔Effect of the invention〕

As described above, according to the present invention, the thickness of the adhesive layer becomes almost zero, so that misalignment and uneven adhesion are less likely to occur.

Moreover, by using a predetermined jig, a large amount can be bonded at once. Furthermore, after bonding, it is sufficient to simply cut out unnecessary portions such as grooves, thus eliminating the need for reprocessing to account for misalignment caused during bonding.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing only a part of the magnetic head, which does not provide a detailed explanation of the present invention. 1... First solid member, 2... Second solid member, 3
...Thin film, 4...Groove, 8...Gap. °Figure 1

Claims (1)

[Claims] 1) In a method of joining two solid members with adhesive,
forming a thin film on one end of the bonding surface of at least one of the two solid members; abutting the two solid members against each other with the bonding surface on which the thin film is formed on the inside; A bonding method comprising the steps of forming a wedge-shaped gap between bonding surfaces, and injecting an adhesive into the gap.