JPS61236880A - Bonding method - Google Patents

Abstract

PURPOSE:To enable the simple and quick boding and fixing of a pair of bonding members, preventing the electrical contact caused by the burr of steel plate, etc., by applying an adhesive mixed with insulating particles to the joining faces of the members to be bonded, joining the members, and heating and curing the adhesive by induction heating. CONSTITUTION:The joining faces 1a, 2a of the members 1, 2 to be bonded are coated with an adhesive 4 (e.g. two-pack type urethane adhesive) containing insulating particles 5 (e.g. glass beads) of a size to keep the bonding faces from direct contact. The adhesive 4 is cured by heating with induction heating to form a bonding layer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an adhesion method suitable for use when, for example, a panel board or the like is adhesively fixed to the side plate of various boxes using an adhesive.

[Conventional technology]

For example, screwing, riveting, spot welding, etc. have been generally used as joining methods for joining and fixing joint members such as steel plates, but in recent years, there have been improvements in workability, cost, and labor saving. From the request,
A method of bonding and fixing both members to each other using an adhesive has come to be used.

[Problem that the invention seeks to solve]

By the way, one of the problems when bonding and fixing parts together using such an adhesive is that the adhesive must be cured in as short a time as possible. High-frequency induction heating methods and the like have been conventionally employed as means for accelerating adhesive curing.

However, there are some problems in curing adhesives using such induction heating methods. In other words, if the above-mentioned corrugated members partially come into contact with each other due to a bump during molding, etc., an overcurrent will flow locally during induction heating, and the adhesive in that area will burn, resulting in a uniform adhesive layer covering the entire joint surface. However, the problem arises that it is not possible to obtain an appropriate and reliable adhesive and fixed state. On the other hand, 1. It is necessary for the above-mentioned adhesive layer to meet the contradictory demands of making it as thin as possible and at the same time ensuring a certain level of thickness, for reasons such as maintaining the reliability of the bonding strength. It is hoped that some measures will be taken with this in mind.

In particular, recently, coated steel sheets have become widely used as materials for various boxes, etc., with the aim of omitting post-processes such as painting and reducing costs. There is a great need for adhesive fixation, and it is desired to eliminate the above-mentioned problems during induction heating.

In view of the above-mentioned circumstances, the present invention solves the problem of electrical continuity caused by beams, etc. when bonding and fixing metal joining members to each other with an adhesive, and makes it possible to easily and properly bond and fix two members together in a short time. The object of the present invention is to provide an adhesion method that can be used.

[Means for Solving the Problems] In order to meet such demands, the bonding method according to the present invention provides bonding between bonding surfaces of a pair of bonding members.

An adhesive mixed with a large number of minute insulating particles with a size that prevents these two joint surfaces from touching each other is applied and interposed to join these two joint members, and then induction heating is applied to the adhesive. Both members are adhesively fixed by curing the agent.

[Effect]

According to the present invention, the presence of insulating particles mixed in the adhesive easily and reliably prevents contact between the joint surfaces of both members, and solves the problem of locally flowing large currents during induction heating. It can be wiped out.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail using embodiments shown in the drawings.

The figure shows an embodiment of the bonding method according to the present invention. In the figure, 1.2 is a bonding member made of a metal plate material such as a painted steel plate, and these bonding members 1.2 are:
The bonding surfaces 1a and 2a are made to face each other and are bonded and fixed with an adhesive 4 such as a two-component urethane adhesive.

Now, according to the present invention, the above-mentioned joining member l.

Between the joining surfaces 1a and 2a of 2, these rejoining surfaces la and 2a
Both bonding members 1.2 are bonded by applying an adhesive 4 mixed with a large number of insulating particles 5 having a size such that they do not come into contact with each other, and then applying the adhesive by induction heating. 4 is cured and both members 1.2 are adhesively fixed via an adhesive layer 3.

According to the above-mentioned configuration, the presence of the insulating particles 5 mixed in the adhesive 4 easily and reliably prevents contact between the bonding surfaces 1a and 2a of both members 1.2 due to the beams 6, etc. This eliminates the problem of locally flowing large currents during induction heating, and also makes it possible to obtain a uniform adhesive layer 3 over the entire bonding surface, thereby achieving appropriate bonding strength between the two members.

Here, the above-mentioned insulating particles 5 have electrical insulation properties, and even if pressure is applied between the joining members 1 and 2, the rejoining surfaces ta and za will contact each other even partially. For example, 0.5φ with an unusual diameter and thickness.
Glass peas, resin powder, etc. are fine, but
Of course, it goes without saying that its size may be about 0.1φ if there is no bridge 6 or the like on the joint surfaces 1a and 2a.

According to the present invention, which has the above-mentioned advantages,
This effect can be exhibited when the joining members 1, 2, etc. are made of painted steel plates, but it is of course not limited to such painted steel plates, and can be applied to adhesively fixed parts between general steel plates. Even if adopted, similar effects can be achieved.

Further, as the adhesive 4 mentioned above, for example, a two-component urethane adhesive used by mixing and reacting isocyanate and polyol is used, for example, when bonding painted steel plates, etc. Although this is preferable in terms of reliability, it is clear that it is not necessarily limited to this.

Note that the present invention is not limited to the structure of the embodiments described above, and the shape and structure of each part may be modified or changed as appropriate.
Moreover, it can be employed in joints between joining members in various devices and devices in various fields to exhibit its effects.

〔Effect of the invention〕

As explained above, according to the adhesion method according to the present invention,
An adhesive containing a large number of insulating particles of a size that is large enough to prevent the two joining surfaces from touching each other is applied and interposed between the joining surfaces of the pair of joining members, and the two joining members are joined together. Then, since the adhesive is hardened by induction heating to bond and fix both members, the presence of insulating particles mixed in the adhesive causes the bonding surfaces of the two members to It easily and reliably prevents contact, eliminates the problem of large currents flowing locally during induction heating, and has various advantages such as the ability to securely bond and fix the bonded members together using the adhesive. It has a positive effect. .

[Brief explanation of drawings]

The figure is an enlarged cross-sectional view of essential parts showing an embodiment of the bonding method according to the present invention. 1.2...9.Joining member, la, 2a-Φ.Fist joining surface,
3: Life adhesive layer, 4: -m adhesive, 5: Insulating particles.

Claims (1)

[Claims] An adhesive containing a large number of insulating particles of a size that is large enough to prevent the two joining surfaces from touching each other is applied and interposed between the joining surfaces of the pair of joining members, and the two joining members are joined together. and then hardening the adhesive by induction heating to adhesively fix both members.