JPH0314341Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) The present invention relates to a joining structure for plate materials including laminated plywood, and in particular, the invention relates to a joining structure for plate materials comprising laminated plywood, and in particular for laminated plywood made by laminating thin metal plates on both surfaces of a synthetic resin intermediate layer. The present invention relates to a joining structure for joining metal plates.

(Prior art) In the past, laminated plywood, which is made by laminating thin metal plates on both surfaces of a synthetic resin intermediate layer, has been used as the outer panel of automobile bodies due to demands for weight reduction and vibration reduction. I came.

When constructing a panel structure by joining the ends of the laminated plywood as the outer panel and the ends of the metal plate as the inner panel, the ends of the laminated plywood are hemmed and the ends of the metal plate are sandwiched. It is necessary to join.

In the above-mentioned laminated plywood, the internal synthetic resin intermediate layer is difficult to plastically deform, and the thin metal plate on the surface is very thin, so the thin metal plate on the outer surface of the bent corner of the hemming is likely to tear. Another problem is that the synthetic resin intermediate layer obstructs spot welding between the hemmed end of the laminated plywood and the metal plate.

Therefore, for example, in Japanese Utility Model Application No. 57-125321,
The ends of the laminated plywood are treated so that the end of one thin metal plate of the laminated plywood protrudes beyond the end surface of the other thin metal plate, and the one thin metal plate is folded back to form a metal panel. A joint structure that is welded to a plate is described.

However, when only one thin metal plate of the laminated plywood is folded back and welded together as described above, it is unfavorable in terms of the strength of the joint. The runner-up problem is that even the thin metal plate on the outer surface of the outer panel is deformed due to thermal distortion, deteriorating the appearance of the outer panel.

In addition, in order to cut the two thin metal plates of the laminated plywood so that the end faces of the laminated plywood are shifted and not aligned, it is not possible to use a normal shearing machine, and a special cutting device must be used. However, it also has the disadvantage of being accompanied by various difficulties in implementation.

(Purpose of the invention) This invention was made in view of the above-mentioned drawbacks, and it is possible to obtain sufficient bonding strength without tearing the thin metal plate at the folded corner of the laminated plywood, and to reduce the appearance deterioration due to thermal distortion. It is an object of the present invention to provide a joining structure for board materials equipped with laminated plywood that can prevent this.

(Structure of the invention) The joining structure of plates with laminated plywood according to the invention is such that a thickened part for hemming bending curvature relaxation is provided at the edge of the metal plate serving as the inner panel, and both sides of the intermediate layer made of synthetic resin are provided. Hemming the ends of the laminated plywood as an outer panel with thin metal plates laminated on the surface, inserting the ends of the metal plates, and inserting the engaging claws provided at the ends of the metal plates into the laminated plywood. The hemming end is inserted into the engagement hole of the hemming end and then deformed outside the periphery of the engagement hole, thereby fixing the hemming end to the metal plate using the engagement claw.

(Effect of the invention) As described above, in the joining structure of plate materials equipped with laminated plywood according to the invention, the thickened part for reducing the hemming bending curvature is provided at the edge of the metal plate as the inner panel, so it can be used as the outer panel. Hemming the edges of laminated plywood can reduce the bending curvature and reliably prevent the thin metal plate on the outer surface side of the bent corner from tearing. Since the joint is made by sandwiching the parts, sufficient strength of the joint part can be ensured.Also, the hemming end of the laminated plywood is inserted into the engaging claw and then deformed outside the periphery of the engaging claw. Since the hemming end is fixed to the metal plate with the engaging claw, it is possible to join without using welding and to prevent deformation due to thermal distortion of the thin metal plate of the laminated plywood.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

For example, the outer panel of a panel structure 1 consisting of an outer panel and an inner panel, such as a car door, is made by laminating thin steel plates 2b with a thickness of approximately 0.1 to 0.4 mm on both surfaces of a synthetic resin intermediate layer 2a. Laminated plywood 2 is also used as an inner panel with a thickness of approx.
The panel structure 1 is assembled by using the rope plates 3 of about 0.8 to 1.2 mm and joining their ends together as follows.

By hemming the end portion 2A of the laminated plywood 2, the end portion 3A of the rope plate 3 is inserted and joined. The hemmed end portion 2A of the laminated plywood 2 is preformed in advance by press forming inwardly by about 90 degrees. The hemming end 2A is formed into a bent flange shape, and elongated engagement holes 4 are provided in the lengthwise direction of the hemming end 2A at appropriate intervals in the lengthwise direction.

The end edge of the above-mentioned rope plate 3, which faces the proximal inner surface side of the hemming end 2A of the laminated plywood 2, has a hemming bending curvature softening edge formed by slightly bending the end edge toward the inner surface. While the thickened portion 5 is formed,
Approximately 2 to 2 times the thickness of the laminated plywood 2 from the edge of the end portion 3A of the rope plate 3 in the portion corresponding to the engagement hole 4.
Turn the area about 3 times the size of the area about 90° towards the inside like a tongue.
An engaging claw 6 formed by bending is provided. (See Figures 1a and 2).

The end 3A of the rope plate 3 is placed on the inner surface side of the outer end 2B which is connected to the base end of the hemming end 2A of the laminated plywood 2.
After overlapping the engagement holes 4 and the engagement claws 6, the hemming end 2A is folded back onto the inner surface of the end 3A of the rope plate 3 using a press machine, and the laminated plywood 2 is hemmed. The end 3A of the rope plate 3 is inserted between the hemming end 2A and the outer end 2B of (see figure b).

Next, by using a press machine to bend the tip of the engaging pawl 6 protruding from the engaging hole 4 toward the edge of the hemming end 2A rather than the periphery of the engaging hole 4, the engaging pawl 6 is bent. Hemming end 2A at the tip of
is pressed against the end portion 3A of the rope plate 3 and fixed (see Fig. 1c and Fig. 3).

In the above-mentioned joint structure between the laminated plywood 2 and the rope plate 3, the thickened portion 5 provided at the edge of the cable plate 3 increases the thickness of the edge in the inner and outer directions, so that the hemmed end 2A Since the hemming bending curvature at the base end of the hemming is relaxed, the thin metal plate 2b on the outer surface side of the bent portion 7 will not be torn, and the hemming end 2A of the laminated plywood 2 will not be torn.
The end portion 3A of the rope plate 3 is inserted between the outer end portion 2B and the hemmed end portion 2A is inserted into the rope plate 3 using the engaging claw 6.
Since the laminated plywood 2 and the rope plate 3 are fixed to each other, the laminated plywood 2 and the rope plate 3 are strongly joined together, and the thin metal plate 2b on the outer surface side of the outer end 2B of the laminated plywood 2 is connected by the engaging claws 6 without using welding. is not deformed by thermal strain.

Here, the above embodiment can be partially modified as follows.

As shown in FIG. 4, an engaging pawl 6A is provided by press-molding the end portion 3A of the rope plate 3 so that it bulges out in a cup shape toward the inner side, and the engaging pawl 6A is sufficiently inserted into the end portion 3A. The hemming end 2 has an engagement hole 4A of a suitable size.
A, the hemming 2A is connected to the rope plate 3.
The end portion 3A is folded back to the inner surface side and hemmed, and with the engaging claw 6A inserted into the engaging hole 4A, the engaging claw 6A is crushed using a press machine, and the engaging claw protrudes from the engaging hole 4A. The hemming end 2A is fixed to the rope plate 3 by the engagement claw 6A by deforming the outer peripheral portion of the tip of the claw 6A into a brim shape outside the periphery of the engagement hole 4A.

As shown in FIG. 5, an engaging pawl 6B is provided by press-punching the end 3A of the rope plate 3 and squeezing it out into a cylindrical shape toward the inner surface. An engagement hole 4B of the same size as the hemming end 2A is provided in the hemming end 2A.
is folded back to the inner surface of the end 3A of the rope plate 3 and hemmed, and with the engagement claw 6B inserted into the engagement hole 4B, the tip of the engagement claw 6B is expanded using a press machine and engaged. By deforming it outside the periphery of the matching hole 4B, the hemming end 2A is fixed to the rope plate 3 by the engaging claw 6B.

The thickened portion 5 provided at the end edge of the rope plate 3 is
The thickness may be increased by folding back the edge as shown in FIG. 6, or the thickness may be increased by welding or applying adhesive to the edge as shown in FIG.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG.
~c are longitudinal sectional views of the main parts at each stage of joining the laminated plywood and the steel plate, Fig. 2 is a perspective view of the main parts before hemming, Fig. 3 is a perspective view of the main parts in the state of completion of joining, and Fig. Figures 4a and b relate to a modification and correspond to Figures 1b and 1c, respectively; Figures 5a and b relate to another modification and correspond to Figures 1b and 1c, respectively. 6 and 7 are longitudinal sectional views of modified examples of the thickened portion, respectively. 2...Laminated plywood, 2A...Hemming end, 2a
...Synthetic resin intermediate layer, 2b...Thin steel plate, 3...
Rope plate, 3A... End, 4, 4A, 4B... Engagement hole, 5... Increased thickness, 6, 6A, 6B... Engagement claw.

Claims (1)

[Scope of utility model registration request] A thickened part is provided at the edge of the metal plate serving as the inner panel to alleviate hemming bending curvature, and the edge of the laminated plywood serving as the outer panel is hemmed. insert the end of the metal plate, insert the engagement claw provided at the end of the metal plate into the engagement hole of the hemmed end of the laminated plywood, and then deform it outside the periphery of the engagement hole. A joining structure for plate materials comprising laminated plywood, characterized in that the hemming end is fixed to the metal plate by the engaging claw.