JP2671460B2 - Connection structure of car body - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile body joint structure, and more particularly to a joint structure such as a door or a bonnet formed by joining two metal panel members. .

b. Conventional Technology FIGS. 5 to 8 show a conventional manufacturing process of an automobile door 1. This door 1
In general, an inner panel 2 and an outer panel 3 each formed by molding a metal plate into a predetermined shape are joined to each other at their peripheral portions. The joining is performed as follows.

That is, first, an inner panel 2 and an outer panel 3 made of metal, which are formed into a shape as shown in FIGS. 5 (A) and 5 (B), are prepared, and an upright bent portion 4 provided on a peripheral edge of the outer panel 3 is prepared. Apply sealer 5 to the inner surface of the. Next, as shown in FIGS. 6 (A) and 6 (B), these members 2, 3 are combined with each other so that the inner panel 2 fits within the bent portion 4 of the outer panel 3, and the peripheral edge portion 6 of the inner panel 2 is combined. To the sealer 5. After that, the bent portion 4 of the outer panel 3 is bent toward the peripheral edge portion 6 of the inner panel 2 by using a hemming press device (not shown) as shown in FIGS. Part 7
And the peripheral portion 6 is held by the U-shaped portion 7.

After the so-called hemmed portion 8 is formed in this manner, the hemmed portion 8 is spot-welded using the spot welding machine 9 as shown in FIGS. 8 (A) and (B). At the time of spot welding, as clearly shown in FIG. 8 (B), the welding tip 10 is applied to the bent portion 4 of the outer panel 3 and the back electrode 11 is applied to the peripheral portion of the outer panel 3 facing the bent tip 4. Hemming part 8 between
Under pressure, insert the transformer 12 (Fig. 8 (A))
8), the welding current I supplied from the outer panel 3 is supplied through the welding tip 10, the U-shaped portion 7, the inner panel 2 and the ground electrode 13 in this order. The nugget 14 was formed at the joint between the bent portion 4 and the peripheral portion 6 of the inner panel 2.

c. Problems to be Solved by the Invention As described above, conventionally, spot welding (so-called after-hem spot welding) is performed after the hemming process in order to prevent the positional displacement between the inner panel 2 and the outer panel 3. However, there were the following problems.

That is, in order to perform spot welding, the back electrode 11
In addition to the above, it is necessary to perform troublesome management regarding the shape of the back electrode 11 so that the outer panel 3 is not scratched or uneven.

Further, in order to prevent the outer panel 3 from being dented by spot welding, the pressure applied to the spot welding spot,
It was necessary to frequently manage welding conditions such as welding current energization time and welding current value.

In addition, the fact is that the spot welding machine 9 used for after-hem spot welding has a high manufacturing cost and lacks versatility.

The present invention has been made in view of such a problem, and an object thereof is to manage troublesome welding conditions with an inexpensive spot welding machine that is versatile and does not require a back electrode. An object of the present invention is to provide a joint structure for an automobile body that enables the production of the automobile body without need.

d. Means for Solving the Problems In order to achieve the above-mentioned object, in the present invention, a peripheral part of an outer panel that constitutes the outside of an automobile body is provided with an upright bent part that is bent inward. In the peripheral portion of the inner panel forming the inside of the automobile body, standing protrusions bent inward are provided at a plurality of spaced-apart locations, and the inner panel is provided on the inner side surface of the standing bent portion of the outer panel. The overlapping portions formed by stacking the upright protruding pieces of the panel are joined by spot welding, and the entire upright bent portion including the joined overlapping portions is bent toward the inner side to form a peripheral edge portion of the inner panel. The inner peripheral surface of the automobile is folded and folded so that the peripheral edge of the automobile body is hemmed.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In addition, in FIGS. 1 to 4, FIG.
The same parts as those in FIG. 8 are designated by the same reference numerals.

First, as the inner panel 2 of the automobile door 1, as shown in FIGS. 1 (A) and 1 (B), a plurality of upright projections (flange) that are bent inward at locations with a predetermined interval on the periphery. ) Prepare the one with 16 formed,
An outer panel 3 having a shape corresponding to the inner panel 2 and having an upright bent portion 4 bent inward at the peripheral edge is prepared. Next, the outer panel 3 is placed and fixed on a jig and the sealer 5 is applied to the inner surface thereof, and then the inner panel 2 is attached to the outer panel as shown by arrows in FIGS. 1 (A), (B) and (C). It is moved to the side of 3 and adhered to the sealer 5. Thereby, as shown in FIGS. 2A, 2B and 2C, the inner panel 2 is housed and arranged in the area surrounded by the bent portion 4 at the peripheral edge of the outer panel 3, and the inner panel 2 is projected. The piece 16 is placed in a state of being overlapped with the inner side surface 4a of the standing portion 4. Along with this, the inner panel 2 is assembled in a state of being positioned with respect to the outer panel 3.

As shown in FIG. 3 (A), the combination member thus obtained is placed and fixed on the work receiving portion 18 of the spot welding machine 17 in a state of being positioned, and is then fixed to the automatic operation device (robot) 19. The welding gun 20 is automatically controlled by the welding tip 24a, as shown in FIG. 3 (B), at the overlapping portion 21 of the protruding piece 16 of the inner panel 2 and the bent portion 4 of the outer panel 3.
Hold between 24b and spot weld. The welding gun 20 used for spot welding has a spindle as shown in FIG. 3 (A).
A pair of support arms 23a, 23b that rotate about 22 and a pair of welding tips 24a, 24b attached to one end of the support arms 23a, 23b, and support arms 23a, 23b centered on the support shaft 22. The hydraulic cylinder 25 is driven in the opposite direction to each other. During spot welding, the overlapping portion 21 is held between the pair of welding tips 24a and 24b by the acting force of the hydraulic cylinder 25 as shown in FIG. 3 (B). Then, a welding current is passed as indicated by an arrow, whereby a nugget 26 is formed at the welded portion.
Incidentally, spot welding is not performed on the portions other than the overlapping portion 21 as shown in FIG. 3 (C). Then, the inner panel 2 and the outer panel 3 are positioned and fixed to each other by the above-mentioned spot welding, so that no positional deviation occurs between them.

After the spot welding for preventing the positional displacement in this way, the entire bent portion 4 of the outer panel 3 including the overlapping portion joined by the spot welding by a hemming press machine (not shown) is shown in FIG. 4 (A). As shown in, a bending process (hemming process) is performed toward the inside. As a result, the overlapping portion 21 is folded over the peripheral edge portion 6 of the inner panel 2 as shown in FIG. 4 (B), and the bent portion 4 of the outer panel 3 other than the overlapping portion 21 is shown in FIG. 4 (C). ), The U-shaped winding portion, that is, the hemming portion 27 is formed on the periphery of the door 1, and the nugget 26 and the hemming portion 27 are formed. Inner panel 2 and outer panel 3
The bond between and will be firmly achieved.

According to the above-described vehicle door 1 coupling structure,
Even if a nick is made at the spot welding location, this nick will eventually be bent to a position where it cannot be seen from the outside, so the welding conditions can be eased and the management man-hour can be reduced. Since it is not necessary to use the back electrode 11 (see FIG. 8B) applied to the front surface side of the outer panel 3, it is possible to reduce the management man-hours for shape matching.

As described above, one embodiment of the present invention has been described, but the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical idea of the present invention.

For example, a bent portion similar to the bent portion 4 of the outer panel 3 (a standing portion that extends continuously instead of being spaced apart like the protrusions 16) is provided on the peripheral edge of the inner panel 2, and the bent portion of the inner panel 2 is It is also possible to perform spot welding at appropriate intervals at the overlapping portion of the outer panel 3 with the rising portion 4 and then perform hemming. Further, the present invention is not limited to the automobile door 1 and can be applied to various automobile bodies such as a bonnet formed by joining two metal panels.

e. Effects of the Invention As described above, according to the present invention, the overlapping portion formed by overlapping the upright projections of the inner panel with the inner side surface of the upright bent portion of the outer panel is joined by spot welding, and the joined overlap is formed. Since the whole of the upright bent portion including the mating portion is bent inward and folded on the inner side surface of the peripheral edge portion of the inner panel, the peripheral edge portion of the automobile body is hemmed. The inner panel and the outer panel can be easily positioned relative to each other by the overlapping action of the upright bent portion and the upright protruding piece. Since it can be placed in a position that cannot be seen from the outside, it is not necessary to set troublesome welding conditions for preventing the occurrence of dents, and the man-hours for managing the welding conditions can be reduced. Further, since it is not necessary to apply the back electrode to the panel member arranged on the outer side, it is possible to reduce the management man-hour for shape matching. Therefore, it is possible to easily perform the work of connecting the first and second panel members.

Further, since the spot welding described above can be performed by an automatic operating device (robot), the spot welding machine used for obtaining the joint structure according to the present invention can be versatile. In addition, when changing the model of the car body, the work receiver (jig part) of the spot welding machine
Since only the replacement is required, it is possible to respond to model changes at low cost and in a short period of time.

[Brief description of the drawings]

1 to 4 are for explaining an embodiment of a vehicle door connecting structure to which the present invention is applied.
FIG. 1 (A) is an exploded perspective view of an inner panel and an outer panel constituting an automobile door, FIG. 1 (B) is an enlarged sectional view taken along line BB in FIG. 1 (A), and FIG. 1 (C) is CC line enlarged sectional view in FIG. 1 (A), FIG. 2 (A)
Is a perspective view showing a state in which the inner panel is assembled to the outer panel, FIG. 2 (B) is an enlarged sectional view taken along line BB in FIG. 2 (A), and FIG. 2 (C) is FIG. 2 (A). C-C in
A line enlarged sectional view, FIG. 3 (A) is a perspective view showing a state in which a door is spot-welded by a spot welding machine, and FIG. 3 (B) is an enlarged sectional view taken along line BB in FIG. 3 (A). FIG. 3 (C) is an enlarged cross-sectional view taken along line CC in FIG. 3 (C), FIG. 4 (A) is a perspective view showing the door after hemming, and FIG. 4 (B) is a fourth view. FIG. 4A is an enlarged sectional view taken along line BB in FIG. 4A, FIG. 4C is an enlarged sectional view taken along line CC in FIG. 4C, and FIGS. FIG. 5 (A) is an exploded perspective view of an inner panel and an outer panel, and FIG. 5 (B) is a manufacturing process thereof.
Is an enlarged sectional view taken along line BB in FIG. 1 (A), FIG. 6 (A) is a perspective view showing a state in which the inner panel is assembled to the outer panel, and FIG. 6 (B) is FIG. 6 (A). B- in
B line enlarged sectional view, FIG. 7 (A) is a perspective view showing the door after hemming, FIG. 7 (B) is a sectional view taken along line BB in FIG. 7 (A), and FIG. 8 (A). Is a perspective view showing a state where the door is spot-welded by a spot welding machine, and FIG. 8 (B) is an enlarged sectional view taken along line BB in FIG. 8 (A). DESCRIPTION OF SYMBOLS 1 ... Automotive door as an automobile body, 2 ... Inner panel as a first panel member, 3 ... Outer panel as a second panel member, 4 ... Upright bent portion, 6 ... Peripheral portion, 16 …… Standing protrusion (flange), 17 …… Spot welding machine, 18 …… Workpiece receiver (jig part), 19 …… Automatic operation device (robot), 20 …… Welding gun, 21 …… Overlapping Part, 26 …… Nugget, 27 …… Hemming processing part.

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Claims (1)

(57) [Claims] 1. An upright bent portion bent inward is provided at a peripheral edge portion of an outer panel forming an outer side of an automobile body, and a space is provided at a peripheral edge portion of an inner panel forming an inner side of the automobile body. Providing upright protruding pieces that are bent inward at a plurality of spaced locations, by spot welding an overlapping portion formed by overlapping upright protruding pieces of the inner panel on the inner surface of the upright bent portion of the outer panel. A hemming process is performed on the peripheral portion of the automobile body by combining and folding the whole of the upright bent portion including the combined overlapping portion inward and folding the folded up portion on the inner side surface of the peripheral portion of the inner panel. A structure for connecting an automobile body, which is characterized in that