JPS6141788B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for joining automobile body steel plates.

Generally, an automobile body is assembled by cutting steel plates into appropriate sizes, press-forming them, overlapping their ends, and joining them by spot welding or the like. Further, in recent automobile bodies, electrodeposition coating is used as an undercoat for painting. Electrodeposition coating is carried out by immersing the car body in an electrodeposition coating bath, which has the advantage that the coating bath can also be applied to the bag. However, the electrodeposition coating bath does not enter the area where the ends of the steel plates are overlapped and welded, resulting in unpainted areas. Even if a sealer or the like is filled into the gap between the joint ends, there is a problem that rust occurs early from the unpainted portion.

The present invention has been devised to avoid such problems, and embodiments of the present invention shown in the drawings will be described below.

As shown in FIG. 1, the automobile body 1 is assembled by repeating operations such as overlapping and welding a front panel steel plate 2 and a support steel plate 2. Therefore, the present invention
A step surface 5 having a step 4 is provided at the end of a lower plate 2 such as a front panel steel plate, and projections 6 are provided on the step surface 5 at appropriate intervals. On the other hand, the upper plate 3 such as a support steel plate
The end portion of the upper plate 3 is press-molded into a shape that fits the step surface 5, and the end portion of the upper plate 3 is overlapped with the step surface 5. The end of the top plate 3 is placed on the protrusion 6 and brought close to the end surface of the top plate 3 with a slight gap between the step and the step. Then, the upper plate 3 and the lower plate 2 are welded together at the protrusion 6 portion by spot welding. The end surface of the upper plate 3 and the lower plate 2
The gap between the stepped portions 4 is filled with sealer 7 after the undercoat is applied.

The effect will be explained.

After welding and assembly, the automobile body 1 is coated with an undercoat by electrodeposition coating. At that time, when the automobile body 1 is immersed in an electrocoating bath, the step surface 5 between the upper plate 3 and the lower plate 2 is coated.
Since the electrodeposition coating bath can flow into the gap between them, there will be no uncoated area at the joint between the upper plate 3 and the lower plate 2. Also, since there is a gap between the top plate 3 and the stepped surface 5,
A sufficient amount of sealer 7 can be packed. When welding the upper plate 3 to the lower plate 2,
Since the protrusions 6 are face-to-face, matching accuracy can also be maintained.

As explained above, the present invention provides a stepped surface with a stepped portion at the end of the lower plate, provides a plurality of protrusions on the stepped surface, brings the end of the upper plate into contact with the protrusion, and makes the upper plate The end face of the plate was brought close to the stepped part, the upper plate and the lower plate were welded together at the protruding part, and sealer was packed into the gap between the end face of the upper plate and the stepped part of the lower plate, so when undercoating with electrodeposition coating, The electrodeposition coating bath flows through the gap between the stepped surfaces of the upper and lower plates, coating the mating surfaces and eliminating any unpainted surfaces, which provides rust prevention and prevents rust from forming at an early stage. I can do it. Further, since the sealer can be sufficiently filled into the gap between the top plate and the stepped surface after the undercoat is applied, it is possible to prevent the sealer from cracking due to twisting while the automobile is running. Furthermore, the accuracy of alignment between the upper plate and the lower plate can be maintained sufficiently by adjusting the protrusion height.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, Fig. 1 is an external perspective view showing the location, Fig. 2 is an enlarged partial perspective view of section A in Fig. 1, and Fig. 3 is a view taken along arrow B-B in Fig. 2. FIG. 2...Lower plate, 3...Upper plate, 4...Step part, 5...Step surface,
6...Protrusion, 7...Sheila.

Claims (1)

[Claims] 1 A plurality of protrusions are provided on the step surface with a step at the end of the lower plate, the end of the upper plate is brought into contact with the protrusion, the end surface of the upper plate is brought close to the step, and the upper plate is placed on the protrusion. A joining device for automobile body steel plates, characterized in that a plate and a lower plate are welded together, and a sealer is filled in the gap between the end face of the upper plate and the stepped portion of the lower plate.