JPS6135498Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a joining device for automobile body steel plates that achieves beautiful joining of hemmed parts and can absorb some dimensional errors during assembly.

2. Description of the Related Art Some parts of an automobile body are formed by hemming a flange and joining the hemmed parts. In this case, conventionally, as shown in FIG. 1, the joint portion of one of the two car body steel plates 1 and 2 to be joined is bent inward,
This bent portion was usually placed against the inside of the other vehicle body steel plate 1, spot welded 3, and the surface of the joint was finished by brazing 4 as shown in FIG. However, in this case, there was a problem that the joint portion 5 became thick.

Therefore, as shown in Fig. 3, the hemmed portion of one car body steel plate 2 is cut at the joint 5, leaving only the part to be spot welded 3, and spot welding 3 is sometimes performed with the other car body steel plate 1. Although this solves the above-mentioned problem, a gap occurs at the joint 5 (the fourth
(see figure), which caused problems with the appearance.

The purpose of this invention is to provide a joining device for car body steel plates that solves these problems all at once.One embodiment of this invention is explained with reference to the drawings.As shown in Fig. 5, one of the car body steel plates is In the flange part 1, the tip of the hemmed part is
On the bent side, the lower surface of the flange root side is cut leaving only the width a, and a cut portion 6 is formed on the lower surface of the flange root side at the tip of the hemmed portion.
Then, as shown in FIG. 6, the other car body steel plate 2 is attached at a distance corresponding to the width a shown in FIG. The upper part of the hemmed part is cut out in advance, and hemming is performed from the rear of the joint part. A protrusion 7 is formed at the joint of the flange on the base side of the flange, extending downward by the thickness of the plate.

The position of this protruding part 7 corresponds to the position of the cut part 6 described above, and as shown in FIGS. 7 and 8, spot welding 3 is performed with the protruding part 7 aligned with the cut part 6. Both vehicle body steel plates 1 and 2 are joined by brazing the joining portion 5.

Since this invention is constructed in this manner, it has the advantage that the hemmed flange portion can be beautifully finished. Furthermore, due to the structure in which the protruding part 7 is aligned and welded to the cut part 6, even if there is some dimensional error during assembly, this can be absorbed, and the cut part 6 and the protruding part 7 are provided on the base side of the flange. This feature allows the base side of the flange to be firmly joined.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing an example of a conventional joining device for car body steel plates, Figure 2 is a front view of Figure 1, and Figure 3 is a front view of Figure 1.
4 is a front view of FIG. 3, FIG. 5 is a perspective view of one of the steel plates of an embodiment of the invention, and FIG.
The figure is a perspective view of the other steel plate of one embodiment of this invention.
FIG. 7 is a perspective view of one embodiment of this invention, and FIG. 8 is a front view of FIG. 7. 1, 2...Car body steel plate, 3...Spot welding, 4
...Brazing process, 5...Joint part, 6...Cut part, 7...Protrusion part.

Claims (1)

[Scope of utility model registration request] In an automobile body made by joining two body steel plates with hemmed flange parts, the cut part provided on the lower surface of the flange root side at the tip of the hemmed part of one body steel plate to be joined and the other body steel plate are joined. and a protrusion provided at a portion corresponding to the cut portion, and the protrusion is welded in alignment with the cut portion.