JPH07314172A - Method for smoothing panel joint - Google Patents

Abstract

PURPOSE:To reinforce both panels without generating strains therein by joining the panels to each other by making combination use of a thermosetting adhesive and welding, then subjecting the joggle part of the panels to thermal spraying, thereby smoothing the joint part. CONSTITUTION:A thermosetting adhesive 3 having a precuring property is applied at the end 2a of the rear fender panel 2 and the roof panel 1 is superposed thereon. Both panels 1 and 2 are joined by welding. The neighborhood of the joggle part of both panels 1, 2 is then subjected to a degreasing treatment and a grit blast treatment and thereafter, the joggle part is subjected to thermal spraying to form a thermally sprayed layer 5 consisting of silicon bronze, etc. Finally, the surface of the thermally sprayed layer 5 is finished smooth by a grinder or sander. The adhesive 3 cures temporally at the time of thermal spraying and cures completely in a baking and drying stage of a coating material. The cured adhesive 3 prevents relative displacement of the panels 1, 2 with each other and, therefore, the generation of the cracks and fissures in the thermally sprayed layer 5 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enhances the sense of unity of a panel, for example, when assembling an automobile body, by smoothing a joint portion formed between vehicle body panels such as a roof and a rear fender or a roof and a pillar. The present invention relates to a method for smoothing a panel joint used to improve the appearance of a vehicle body.

[0002]

2. Description of the Related Art Conventionally, in assembling an automobile body, arc brazing (see, for example, Japanese Utility Model Laid-Open No. 1-89885) or thermal spraying (see Japanese Patent Laid-Open No. 4-17656) is performed at the seam of the vehicle body panel as described above. After filling the joggles of both panels by applying the method, the surface of the panels is smoothed by a sander or grinder so that the joining lines of the panels are erased and the appearance of the vehicle body is improved.

When thermal spraying is applied, in order to prevent cracks and cracks in the sprayed coating due to relative displacement between panels due to vibrations caused by transportation of the vehicle body, door construction work, etc., MIG is performed prior to spraying. Welding or spot welding with a short pitch was performed, and both panels were joined together to reinforce and prevent displacement between the panels.

[0004]

However, in the case of reinforcing by MIG welding prior to thermal spraying, not only is it necessary to grind the weld beads with a grinder, but also thermal distortion occurs in the panel, so thermal distortion during thermal spraying occurs. There is a problem in that it may be necessary to fill the deformed portion due to, and the number of finishing steps increases. In addition, when spot welding is performed, it is necessary to shorten the pitch and weld multiple points, which inevitably causes appearance defects due to deformation and dents, as well as the work backhaul provided on the inner panel side. There is a problem that both ends of the panel joint cannot be welded due to the size restriction of
Resolving these problems has been an issue for improving the work efficiency in smoothing the panel joint portion by the thermal spraying method and improving the appearance quality of the vehicle body.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it is possible to reinforce both panels without causing the panel to be distorted. Therefore, it is based on the relative displacement between the panels. It is an object of the present invention to provide a method for smoothing a panel seam that can effectively prevent cracks and cracks in a sprayed film.

[0006]

A method for smoothing a panel seam according to the present invention includes a method of smoothing a seam portion between panels by thermal spraying, in which a thermosetting adhesive that is hardened by heat during thermal spraying and welding are used. After joining the panels together, it is characterized in that the joint part is smoothed by spraying the joggle part of the panel, and the structure of such a panel joint smoothing method is described above. Is used as a means for solving the problem.

In the embodiment of the method for smoothing a panel seam according to the present invention, a thermosetting adhesive having a precure property is used, or a thermosetting adhesive for a panel positioned inside is used. It is possible to apply it near the edges, form a groove for filling adhesive on at least one panel, and even use a tape type adhesive as a thermosetting adhesive. In an aspect, the joggle formed on the panel seam can be formed on both panels to be joined.

[0008]

In the method of smoothing a panel seam according to the present invention, when both panels are reinforced prior to thermal spraying, for example, spot welding or MIG welding is combined with a thermosetting adhesive to join both panels. Since the spot welding or MIG welding is performed at the minimum amount necessary to prevent the panel deformation until the end of thermal spraying, distortion and deformation due to welding hardly occur. And the thermosetting adhesive is cured by the heat at the time of thermal spraying, preventing relative displacement of the panel due to vibration,
This prevents cracks and cracks from occurring in the sprayed film, and also contributes to improvement of the bonding strength of the panel.

In the embodiment of the method for smoothing a panel seam according to the present invention, since a thermosetting adhesive having a precure property is used, the adhesive is temporarily cured by the heat at the time of thermal spraying. Similarly, while preventing relative displacement of the panel due to vibration to prevent cracks and cracks in the sprayed film, for example, it is completely hardened by the heat during baking and drying in the subsequent coating process, improving the bonding strength of the panel. In the same embodiment, the thermosetting adhesive is applied near the end of the panel located inside, the groove for filling the adhesive is formed on at least one panel, and the thermosetting adhesive is further applied. By using a tape-type adhesive as the conductive adhesive, the adhesive may drip on the sprayed surface due to gravity before the thermal spraying, or due to vibration during grit blasting. Adhesive is prevented from or protrudes spray coat surface Te.

Furthermore, in the embodiment, the so-called two-step joggles are formed by forming the joggles formed at the panel joints on both panels to be joined, so that even if distortion occurs due to welding or thermal spraying, the two-step joggles are formed. The deformation of the panel is further reduced because it is absorbed by the parts.

[0011]

EXAMPLES The present invention will be specifically described below based on examples.

Embodiment 1 FIG. 1 is a process chart showing the procedure of a method for smoothing a panel seam according to the present invention, and FIGS. 2 (a) to 2 (d) show a first embodiment of the smoothing method. It is sectional drawing of the vehicle body panel which shows a process one by one, The code | symbol 1 shows a roof panel and the code | symbol 2 shows a rear fender panel, respectively.

First, as shown in FIG. 2 (a), an acrylic thermosetting adhesive 3 (DK60: manufactured by Denki Kagaku Kogyo Co., Ltd.) having a pre-curing property is attached to an end of the rear fender panel 2.
Is applied over substantially the entire width dimension of the rear fender panel 2, and the roof panel 1 is laid on top of it, as shown in FIG.
Both panels 1 and 2 by MIG welding as shown in FIG.
Joined.

At this time, in order to prevent the adhesive from dripping on the sprayed surface or protruding from the surface due to gravity or vibration during grit blast described later, the adhesive 3 is placed at a position near the end edge 2a of the rear fender panel 2. It was applied. Further, the welding beads 4 formed by MIG welding were formed to be short at about two positions in the width direction of the rear fender panel 2.

Next, as a pretreatment of the sprayed portion, both panels 1
In addition to degreasing treatment in the vicinity of the jogger portion of No. 2 and 2 according to a conventional method, and as a ground treatment for improving the adhesion to the sprayed metal, after performing grit blast treatment, the jogger portion is brought closer to a distance of 150 mm. 2 is sprayed by a spray gun to generate a sprayed layer 5 made of silicon bronze as shown in FIG. 2C, and finally, as shown in FIG.
As shown in (d), the surface of the sprayed layer 5 was smoothed by a grinder or a sander. The adhesive 3
Was temporarily cured by being heated to about 150 ° C. for about 30 seconds during thermal spraying.

By the above steps, after the door and the trunk lid are attached to the vehicle body which has been subjected to the smoothing process of the joint between the roof panel 1 and the rear fender panel 2,
The adhesive 3 was conveyed to a coating line and applied with paint, and the adhesive 3 was completely cured in the baking and drying step of the paint, but during this time, no cracks or cracks were found in the sprayed layer 5.

Embodiment 2 FIGS. 3 (a) to 3 (d) are sectional views of a vehicle body panel for sequentially explaining the steps of a second embodiment of the method for smoothing a panel seam according to the present invention. Is the roof panel,
Reference numeral 12 indicates a rear fender panel, and in this embodiment, jog portions are formed on both the roof panel 11 and the rear fender panel 12 to be joined from the viewpoint of preventing deformation of the panels more completely. Dan joggles are used.

First, as shown in FIG. 3A, an epoxy-based thermosetting adhesive 13 (Sunline 2301N: manufactured by Asahi) having a pre-cure property is applied to the end of the rear fender panel 12. Is applied to the end side excluding the central part in the width direction (see FIG. 4), the roof panel 11 is laid on it, and as shown in FIG. 3 (b), both panels 1 and 2 are joined by spot welding. did. At this time, as shown in FIG. 4, spot welding was performed at two places P, P near the center of the rear fender panel 12 in the width direction to avoid the application position of the adhesive 13.

Next, as in the first embodiment, as a pretreatment of the thermal spraying portion, degreasing and ground treatment by grit blasting are performed, and then the joggle portion is thermally sprayed, as shown in FIG.
As shown in (c), a sprayed layer 1 made of silicon bronze.
5 was generated. At this time, the adhesive 13 was similarly temporarily hardened by the heat at the time of thermal spraying.

Finally, as shown in FIG. 3 (d), the surface of the sprayed layer 15 was finished to be smooth by a grinder or a sander, and the smoothing treatment of the joint was completed.

In the same manner as in the first embodiment, the vehicle body that has been subjected to the smoothing process in this manner is attached to a door, a trunk lid, and the like, and then conveyed to a painting line for painting. No cracks or cracks were found in the sprayed layer 15. In this example, by using the two-step joggle, the indentation of the spot welded portion was filled with the sprayed layer 15, and a very good appearance was obtained.

In both of the above examples, a thermosetting adhesive having a precure property was used, but in the present invention, a thermosetting adhesive having no precure property can also be used. Alternatively, it may be completely cured by heating at 150 ° C. for about 30 seconds. Further, in the above-mentioned embodiment, an example of applying the amorphous adhesive to the lower side panel (rear fender panel) is shown, but a tape-shaped thermosetting adhesive can also be attached, whereby This makes it easier to apply the adhesive and prevents the adhesive from dripping or sticking out.

Further, as shown in FIG. 5, for example, a groove 22a for applying an adhesive can be formed in advance in the rear fender panel 22, which also facilitates the operation of applying the adhesive, and Can be easily held at a predetermined position, and the adhesive can be prevented from dripping or sticking out.

[0024]

As described above, the method for smoothing a panel seam according to the present invention involves welding with a thermosetting adhesive that is cured by the heat of thermal spraying when smoothing the seam between panels by thermal spraying. After joining the panels together with and, the joint is smoothed by spraying the joggle portion of the panels. For example, the panel until the spot welding or the MIG welding finishes the spraying. Since the minimum amount required to prevent deformation is sufficient, distortion and deformation due to welding will hardly occur, and the thermosetting adhesive cured by heat during thermal spraying will prevent relative displacement between panels. In addition, it has an extremely excellent effect that it is possible to prevent cracking of the sprayed film and generation of cracks.

In the smoothing method for the panel seam according to the second aspect of the present invention, since the thermosetting adhesive having the precure property is used, the adhesive is temporarily cured by the heat at the time of thermal spraying. However, for example, until completely cured by heat during baking and drying in the subsequent coating process,
It is possible to prevent relative displacement between the panels, effectively prevent cracks or cracks from occurring in the sprayed film, and improve the joint strength of the panels after complete curing.

In the method of smoothing a panel seam according to claims 3 to 5 of the present invention, a thermosetting adhesive is applied near the end of the panel located inside, or at least one panel is applied. Since a groove for filling the adhesive is formed on the tape or a tape type adhesive is used as the thermosetting adhesive,
There is an effect that it is possible to effectively prevent the adhesive from dripping on the sprayed surface due to gravity, or the adhesive from protruding to the sprayed surface due to vibration during grit blasting.

Further, in the smoothing method for the panel seam according to the sixth aspect of the present invention, since the joggle portion is formed on both of the joined panels,
Even if distortion occurs due to welding or thermal spraying, it is absorbed by both joggle parts, and the deformation of the panel can be further reduced.

[Brief description of drawings]

FIG. 1 is a process drawing showing a procedure of a method for smoothing a panel joint according to the present invention.

2 (a) and 2 (b) are sectional views of a vehicle body panel for sequentially explaining a process of a first embodiment of a method for smoothing a panel seam according to the present invention.

3 (a) and 3 (b) are sectional views of a vehicle body panel for sequentially explaining a process of a second embodiment of a method for smoothing a panel joint according to the present invention.

FIG. 4 is a view from the direction of arrow IV in FIG. 3 (b).

FIG. 5 is a cross-sectional view of a vehicle body panel showing an example in which a groove for filling an adhesive is provided at an end portion of the panel.

[Explanation of symbols]

 1,11 Roof panel (panel) 2,12,22 Rear fender panel (panel) 3,13 Thermosetting adhesive

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C23C 4/00

Claims (6)

[Claims] 1. When smoothing a joint between panels by thermal spraying, the panels are joined together by using a thermosetting adhesive that is hardened by the heat of thermal spraying and welding, and then sprayed on the joggle portion of the panel. A smoothing method for a panel seam, characterized by smoothing the seam portion by applying. 2. The method for smoothing a panel seam according to claim 1, wherein the thermosetting adhesive has a pre-cure property that is temporarily cured by heat during thermal spraying. 3. The method for smoothing a panel seam according to claim 1, wherein the thermosetting adhesive is applied near the end of the panel located inside. 4. The method for smoothing a panel seam according to claim 1, wherein a groove for filling an adhesive is formed in at least one panel. 5. The method for smoothing a panel seam according to claim 1, wherein the thermosetting adhesive is a tape type adhesive. 6. The method for smoothing a panel seam according to claim 1, wherein the joggle portion is formed on both panels to be joined.