JPH05278630A - Method of applying hemming sealer - Google Patents

Abstract

PURPOSE:To firmly bond a panel and facilitate the removal of a protruding adhesive. CONSTITUTION:In applying an adhesive to the bonding part of a panel 1 when the terminal part of the panel 1 is turned up and bonded, a soft adhesive 5 is applied on the turned end side, and a strong adhesive 4 is applied on the inside thereof. In the state where the adhesives are hardened after hemming treatment, the bonding part of the panel 1 is firmly bonded by the strong adhesive 4, the adhesive 6 protruding from the top end side of the turned part 3 and the panel top end is the soft adhesive 5, and the protruding adhesive 6 can be easily removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for applying a hemming sealer when joining panels and the like.

[0002]

2. Description of the Related Art For automobile doors, engine hoods, trunks, etc., the end of a molded panel is bent, an adhesive is applied to this part, hemming is performed, and then the adhesive is cured by heating to make the panel. The rigidity of the joint is improved and the joint is rustproof. As shown in FIG. 4A, in the door of the automobile, the PVC is provided inside the terminal portion of the outer panel 1.
A (polyvinyl chloride) adhesive 5 is filled, an inner panel 2 is overlapped on this as shown in FIG. 4B, and a folded portion 3 is hemmed to join the two panels 1 and 2.

In Japanese Unexamined Patent Publication No. 52-7524, an edge portion of one vehicle body panel is extended to form a flange for folding, and an adhesive is applied to a mating surface of each vehicle body panel to form a folding flange. A method of joining a vehicle body panel by clinching the overlapping portions that are bent and adhered is described.

[0004]

In the product after hemming using the adhesive shown in FIG. 4, as shown in FIG. 4B,
The adhesive protrudes from the tip of the outer panel 1 that is folded and joined. The protruding portion 6 of this adhesive must be removed in appearance. The same applies to the method of connecting the vehicle body panels described in the above publication. When a PVC-based adhesive is used, the adhesive protruding portion 6 is flexible even after curing and the adhesive protruding portion 6 can be easily removed, but the adhesive strength is weak and desired bonding strength cannot be obtained. There is a problem. When epoxy type is used as the adhesive, the bonding strength is strong,
Since the adhesive that sticks out strongly adheres to the panel, it becomes difficult to remove it, and since it solidifies after curing, there is a problem in the sealing property of the panel joint.

It is an object of the present invention to provide a method for applying a hemming sealer, which strongly joins panels, easily removes the protruding adhesive, and has a good sealing property at the joint. It is a thing.

[0006]

According to the present invention, when a terminal portion of a panel is folded and joined, an adhesive is applied to the joint portion of the panel, and a flexible adhesive is applied to the inside of the folded adhesive at the tip of the folded portion. This is a method for applying a hemming sealer for applying an adhesive.

[0007]

[Function] After the hemming process, when the adhesive is hardened, the joints of the panel are firmly joined with a strong adhesive, and the adhesive protruding from the tip side of the folded portion and the panel tip becomes a soft adhesive. The adhesive that has squeezed out can be easily removed, and the seal at the abutting portion of the panel after the removal can be well maintained by the soft adhesive.

[0008]

EXAMPLE FIG. 1A is a partial cross-sectional view showing a filling state of an adhesive in a panel, and FIG. 1B is a partial cross-sectional view showing a state after hemming. As shown in FIG. 1A, the inner panel of the outer panel 1 is in contact with the bent portion and is PVC.
The system adhesive 5 is filled, and the epoxy system adhesive 4 is filled inside. Next, in the same way as the conventional one, the inner panel 2
And the folded-back portion 3 is hemmed to join the two panels. In the state where the adhesive is heated and cured, as shown in FIG. 1B, both panels 1 and 2 are strongly joined by the epoxy adhesive 4, and the tip side of the folded-back portion 3 and the protruding portion 6 are PV.
Since it becomes the C-based adhesive 5, the protruding portion 6 can be easily removed, and the seals at the tip abutting portions of both panels 1 and 2 after removing the protruding portion 6 are PVC-based adhesives that are flexible even after curing. A value of 5 holds good.

FIG. 2 shows various coating patterns of the epoxy adhesive 4 and the PVC adhesive 5 on the outer panel 1, and FIG. 3 shows the inner panel 2 on which the epoxy adhesive 4 and the PVC adhesive 5 are applied. The various patterns in the case are shown. In any case, after the hemming process, it becomes the same as in FIG. 1B. Next, a 1: 1 equivalent amount of the epoxy adhesive 4 and the PVC adhesive 5 were applied in the state shown in FIG. 1, and the hemmed sample as shown in FIG. 1B and the PVC and epoxy adhesives were applied. Table 1 shows the results of measuring the shear strength (unit: MPa) of the joint portion of the sample that was hemmed using only the sample. From Table 1, it was found that the bonding strength of the sample according to the method of the present invention was almost the same as that when only the epoxy adhesive was used.

[0010]

[Table 1]

As described above, a strong adhesive such as epoxy or acrylic is used on the inside of the joint (referred to as a strong adhesive in this specification), and PVC, urethane or silicon is used on the tip of the joint. Although the adhesive strength of etc. is not stronger than that of the strong adhesive, it is possible to apply a hemming process after applying an adhesive (herein referred to as a soft adhesive) that is flexible and easy to remove even after curing. , The adhesive at the protruding portion becomes a soft adhesive while maintaining the bonding strength almost at the same level as when only a strong adhesive is used. Good sealability is maintained at the butt tips, and rust prevention is also improved.

[0012]

According to the present invention, it is possible to easily remove the adhesive protruding from the front end of the panel by the hemming process while maintaining the strong bonding force of the panel, and the sealing property of the bonding portion is also good.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a state after application of an adhesive of the present invention and a hemming process.

FIG. 2 is a partial cross-sectional view showing various coating modes of the adhesive of the present invention.

FIG. 3 is a partial cross-sectional view showing another application mode of the adhesive of the present invention.

FIG. 4 is a partial cross-sectional view showing a state after application of a conventional adhesive and hemming processing.

[Explanation of symbols]

1 Outer panel 2 Inner panel 3
Folded part 4 Epoxy adhesive 5 PVC adhesive 6
Adhesive protrusion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Mr. Oishi, No. 8 Tsutana, Fujisawa City, Kanagawa Prefecture, Isuzu Central Research Institute Co., Ltd.

Claims (1)

[Claims] 1. When folding back and joining the end portion of the panel,
A method for applying a hemming sealer, characterized in that, when applying an adhesive to the joint portion of the panel, a flexible adhesive is applied to the folded tip side and a strong adhesive is applied to the inside.