JPS5915470A - Automobile assembly technique - Google Patents

Abstract

PURPOSE:To join components such as bodies only by adhesives without resort to any mechanical means such as clamp, interposing a microencapsulated adhesive between joining areas of adherends and then applying press. on them. CONSTITUTION:For example, when a pair of adherends 1a, 1b are joined together at joining areas 2a, 2b having a flange formed at the end, a microencapsulated adhesive 3 [e.g., a blend of an epoxy resin (chief material) with diamines (hardener) sealed in a capsule made of gelatin, etc.] and a structural adhesive 4 (e.g., a thermosetting adhesive providing high bonding strength) are applied alternately at fixed intervals to opposite surfaces of said joining areas. By applying press. on the joining areas, adherends 1a and 1b are sticked to each other with the adhesive 3 to an extent of resisting transportation or fabrication in other areas. The structural adhesive 4 is allowed to cure completely by heat at a baking finishing process, etc. later.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automobile assembly method, and more particularly to an assembly method in which structural members such as a vehicle body are joined with an adhesive.

For example, when assembling the body of a car, adhesives such as paste or film mastic adhesives or hemming adhesives have recently been used to join component parts together; in the past, adhesives were not used. After applying to the joint,
Since the adherends are bonded to each other by aligning the joints, it is common practice to use an adhesive that requires a slightly longer curing time in consideration of workability. However,
The automobile production process is usually a complete assembly line,
When assembling the body, processing is carried out in the next process immediately after the completion of the adhesive work. Therefore, in an assembly method that uses only adhesive, the product is transported before the adhesive has hardened to practical strength, and then the next process is carried out. Since processing is performed during the process, there is a risk that the adhered material may shift or peel off. For this reason, conventionally, when joining adherends with adhesive, spot welding is also used, or fastening means such as clamps are used to prevent the adherends from shifting. There is a problem that marks may be left on the surface of the material, and undulations and distortions may occur.Also, there are disadvantages in that the sockets 1 to 'f4 contact cannot be applied to members that do not have electrical conductivity. In some cases, there was a problem that the workability was poor and productivity was hindered.

This invention was made in view of the above-mentioned circumstances, and it is possible to join adherends that are structural members of an own vehicle by using only adhesive without using mechanical means such as spot welding. The purpose is to provide an automobile assembly method that can reliably join kimonos, and its feature is a microcapsule adhesive that has a short curing time and contains at least one of the main agent and hardening agent in a capsule. of,
After being interposed between the joints of the adherends, the capsules are crushed by applying pressure to the adherends using a press or the like, and as a result, the adhesive adheres to the joint surfaces of each joint part to join each adherend. It is in the point of doing. In other words, according to this invention, the adhesive strength reaches practical strength almost immediately after the completion of the adhesion work, so even if the adherend is transported to the next process and processed immediately after the completion of the adhesion, the adherend will not shift or peel. Therefore, it is no longer necessary to use mechanical means such as spot welding Yak clamps, which were required in the past. In addition, when using an adhesive with a short curing time, if the adhesive is applied to the joints, the adhesive will begin to harden before the joints are joined together, and there is a risk that sufficient adhesive strength will not be obtained. In this invention, by using a microcapsule adhesive, the capsules are crushed and the adhesive is adhered to each joint surface, so the adhesive begins to harden as soon as each joint is brought together, so that the adhesive is sufficiently applied. Each adherend can be joined with a strength of

The method of the present invention will be explained in more detail below with reference to Examples.

For example, a pair of adherends 1a forming constituent members of a vehicle body.

1b is joined by flange-shaped joints 2a and 2b formed at the end edges thereof as shown in FIGS. 1 and 2. First, on the opposing surfaces (joint surfaces) of each joint, A 74-microforce adhesive 3 and a base 1-shaped or film-shaped structural adhesive 4 are applied alternately at regular intervals. Here, the microcapsule type adhesive 3 is one in which at least one of a base agent and a hardening agent is housed in a capsule made of gelatin, for example, and the hardening time (practical strength) due to mixing of the base agent and hardener. It is an adhesive with a short curing time (hardening time), and specifically, epoxy adhesives whose main ingredient is epoxy resin and hardening agent is diamines, or polyester adhesives whose main ingredient is polyester and hardening agent is peroxide. Adhesives, etc. When selecting the microcapsule adhesive 3, the selection should be made based on the curing time as well as the adhesive strength. It is fine as long as it is something. Furthermore, since the base agent or curing agent accommodated in the capsule cannot be attached to the joint parts 2a, 21) as is, only one of the base agent or the curing agent is accommodated in the capsule, and the capsule is mixed into the other. It is preferable to apply it to the joint parts 2a and 2b in a state where it is
In this way, the Micro Cub will be able to attach any other adhesive 3 to the joint 2a12+1.
The liquid will be needed.

On the other hand, the structural adhesive 4 is a microcapsule type adhesive 3.
It takes a long time to harden compared to other materials, and exhibits particularly high adhesive strength.

After applying the microcapsule adhesive 3, structural adhesive 4, etc. as described above, the joint parts 2a and 2b are brought together and pressure is applied using a press or the like to bring them into close contact. Then, since the aforementioned capsules are crushed, the main ingredient and curing agent in the microcapsule type adhesive 3 are mixed, and as a result, each adherend 1a, 1b has a combination of the microcapsule type adhesive 3 and the structural adhesive. 4 and its junction 2a in both provinces
.

2b. In that case, since the microcapsule type adhesive 3 has a short curing time, as soon as the capsule is crushed and the base agent and curing agent are mixed, curing starts, and the practical strength is reached in a short period of time. Even if the structural adhesive 4 is uncured, the adherend 1a is removed immediately after the pressure is released.

Even if 1b is transported or other processing is performed on 1a, 1b, displacement or peeling of adherends 1a, 1b can be prevented. Note that the structural adhesive 4 is cured by heat in a process subsequent to the bonding process, such as a baking process, and exhibits its final strength.

3 and 4 show an example in which the adherends 1a and 1b are overlapped, and when overlapping, each adherend 1a and 1b
The edge portions of are defined as joint parts 2a and 2b, and the joint part 2a at -,
The microcapsule type adhesive 3 with a hardening time of 0 and the structural adhesive 4 etc. are applied alternately at regular intervals to the opposing surfaces (joining surfaces) of 2b. Joint part 2
Overlap a and 2b and t! After that, pressure is applied using a press to bring the two parts into close contact. In this case as well, as in the case of A3If in the above-mentioned embodiment, the capsule is crushed and the main agent and curing agent are mixed and rapidly cured, so the adherends Ia and 1b are directly conveyed or la.

Even if 1b is processed, there is no risk of displacement or peeling.

Furthermore, FIGS. 5 and 6 show an example in which the method of the present invention is applied to a hemmed part. The joint part 2
A microcapsule type adhesive 3 with a short curing time and a structural adhesive 4 are alternately interposed at regular intervals between the bald fold part of the other adherend 1b that encloses the bonding part 2b, or the joint part 2b. I can get away with what I did. That is, after pre-hemming, when performing hemming to bend the seam at 18 degrees, the capsules of the microphone [cononovcell type adhesive 3] are crushed and harden rapidly;
As in each of the embodiments, it is possible to immediately and firmly join each adhered layer 1a, 1b.

In addition, in each of the above practical examples, the microcapsule type 1 adhesive 3 and the structural adhesive 4 were used together, but in this invention,
The adherend may be bonded only to the microcapsule type adhesive.

As explained above, according to the automobile assembly method of the present invention, a microcub (Z-type adhesive) with a hardening time of 0, in which at least one of a main agent and a hardening agent is housed in a capsule, After interposing the capsule between the joints of the adherend, the capsule is crushed by applying pressure to the adherend using a press or the like, and the adhesive attached to the joint surface of each joint is crushed. Since the adherends are bonded by the agent, the adherends can be immediately and firmly joined by applying pressure to the joint, and therefore, according to the present invention,
Can the adherend be transported immediately after bonding or processed in the next process? 1. Since the kimono does not shift or peel, mechanical fastening methods such as spot welding and clamps that were previously required are no longer required, and as a result, there is no need to leave marks on the adhered material, or cause it to undulate. In addition to not causing distortion, assembly]: It is possible to reduce the number and equipment, improve productivity, and at the same time reduce production costs.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of a bonded state according to the method of the present invention, and FIG. 3 is a schematic illustration showing another example of a bonded state according to the method of the present invention, FIG. 4 is a sectional view taken along the line IV--IV in FIG. 3, and FIG. FIG. 6 is a schematic cross-sectional view showing still another example of zygotic symptoms produced by the method of the present invention, and FIG. 6 is a cross-sectional view taken along the line vr-vr in FIG. 1a, 1b... adherends, 2a, 2b... joint parts. 3...Microcapsule type adhesive Structural adhesive for 4. Figure 1 - ■ Figure 3 Figure 5 Figure 2 Figure 4 n Figure 6

Claims (1)

[Claims] A microcapsule type adhesive having a short curing time in which at least one of a base agent and a curing agent is housed in a capsule is interposed between the bonded parts of the adherends to be bonded, and then the bonded part is pressurized to form the capsules. An automobile assembly method characterized in that the adherend is joined by the adhesive by crushing the adherend.