JPH0241724A - Joining method for plate work - Google Patents

Abstract

PURPOSE:To reduce the cost of product and the cost of equipment by separating a tab from one of two joined flanges and forming a tab insert part on the other joined flange to join a work. CONSTITUTION:When two works are joined through a sill inner panel 10 and a sill outer panel 11, etc., joined flanges 12, 13 are formed so that the front surfaces are located in the same surface. Then, a square tab 15 is divided by two slits 14 on the flange 13 of the panel 11 and a front U-shaped tab insert part 16 is formed on the flange 12 of the other side. Further, a relief part 12a is provided under the flange 12 and the flanges 12, 13 are positioned to turn the tab 15 downward through the insert part 16. Since the generation of scraps can be reduced, the yield of the material is improved and the manufacturing cost is reduced. The cost of equipment is also reduced by miniaturizing the equipment.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is suitable for use in a method for joining plate-shaped workpieces, for example, in temporarily assembling parts to be carried into the car body assembly process when assembling an automobile body. The present invention relates to a joining method.

(Prior Art) As a conventionally known joining method of this type, there is one disclosed, for example, in Japanese Utility Model Application Laid-open No. 63-80288.

As shown in FIG.
62 with respective joining flanges 63 .
When joining at 64, with both joining flanges 63 and 64 in surface contact with each other, a long LJ is installed at the tip of either joining flange 63 to protrude long from there toward the other joining flange. By folding back the tab 65 provided on the other joint flange 64 through a notch guide portion 66 that receives the tab 65, the other joint flange 64 is folded back.
In turn, the plate-like workpiece 62 provided with the same is firmly held between the joining flange 63 of the plate-like workpiece 61 and the tab 65.

(Problem to be Solved by the Invention) However, in this prior art, since the tab 65 is provided to protrude long from the tip of the joining flange 63 toward the front side, it is difficult to form the tab 65. There is a problem that the amount of scrap for configuring the plate-shaped work 61 is extremely low.
On the other hand, there was a problem in terms of equipment costs, as the press mold had to be made considerably large.

This invention was made by focusing on the problems of the prior art, and provides a plate-shaped workpiece that can advantageously improve the material yield and sufficiently avoid the increase in the size of the press die. The present invention provides a joining method.

(Means for Solving the Problems) The method for joining plate-shaped workpieces of the present invention is such that when two plate-shaped workpieces are joined by respective joining flanges provided thereon, the end surfaces of both workpieces are in the same plane. The tab separated from either one of the joint flanges located inside is folded back through a tab insertion portion previously formed on the other joint flange.

(Function) In this joining method, by separating the tab from either one of the joining flanges whose end surfaces are located in the same plane, the tab is made to protrude long from the end of the joining flange. Compared to conventional technology, it is possible to almost completely prevent the generation of scrap caused by the formation of tabs, significantly improving material running speed, and reducing equipment costs by downsizing press dies. Can be done.

In addition, here, by folding the tab separated from one of the joint flanges through the tab insertion part formed in advance on the other joint flange, some room for relative displacement is left between the two plate-shaped workpieces. However, the two can still be joined with sufficient strength. Therefore, when this method is applied, for example, to the temporary assembly process of an automobile body, it is possible to effectively prevent accidental falling off of automobile parts when the temporary assembly structure is transported to and carried into the car body assembly process. Of course, the relative displacement of both plate-shaped workpieces and, by extension, both joining flanges, can sufficiently allow accurate positioning of the parts relative to each other in the vehicle body assembly process in the temporarily assembled state.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a route plan view showing a vehicle body assembly line to which the joining method of the present invention is applied.

In the figure, 1 indicates the traveling route of the workpiece conveyance device, and 2.3.
4 indicates a floor loading process, a temporary assembly process, and a vehicle body assembly process, respectively.

In this car body assembly line, first, in the floor loading process 2,
Positioning and arranging the floor main assembled in another process on the workpiece transport device using a drip lifter or the like to enable the workpiece transport device to transport the floor main,
Next, in the temporary assembly process 3, the body sides, which were also pre-assembled in another process, are placed on both sides of the floor main transported there by the workpiece conveyance device, and these body sides and other parts are connected to the floor main. The floor main, which was temporarily assembled by the invented method in the approximate positioning state, and then transported there in the temporarily assembled state in the vehicle body assembly process 4,
By accurately positioning the body side and other parts at predetermined relative positions using a positioning robot (not shown) without removing the temporarily assembled state, and by welding them together using a welding robot (not shown). , and finally assemble the floor main and body side and other parts at predetermined relative positions.

After that, in the first and second light addition processes 5.6, the main body is completed by performing additional welding, and then in the main body transport process 7, the main body is moved from the traveling route 1 to the next one. Transport to the process.

By the way, when temporarily assembling the floor main 8 and the body side 9 as illustrated in FIG. In the sill inner panel 10 and the sill outer panel 11 located at the lower end of the body side 9, for example, as shown in FIG. form connecting flanges 12,13 located in the same plane, and these connecting flanges 1
2.13, as shown in the figure, from the joining flange 13 of the sill outer panel 11, by two slits 14 provided there and extending in the vertical direction,
While dividing the tab 15, which has a substantially rectangular front shape, the other joint flange 12 is provided with a tab insertion portion 16, which has a substantially U-shape front shape and is somewhat wider than the tab 15. A joining flange 12 is attached to the lower part of the insertion part 16.
Temporary assembly is prepared by providing the protruding part 12a, and then the rejoining flange ratio 12 is brought into surface contact by roughly positioning the floor main 8 and the body side 9, and after tightening, the tab 15 is , as shown in FIG. 3(b), by folding downward through the tab insertion part 16,
Between the joining flange 13 and the folded portion of the tab 15, the joining flange 12 and, by extension, its protruding portion 12a are inserted.

According to the joining method described above, by providing the two slits 14 in the joining flange 12, the - tab 15 can be formed, so that a long protruding portion is formed at the tip of the joining flange. Compared to the prior art of forming projecting tabs, the amount of scrap generated can be advantageously reduced, a significant improvement in material yield and a significant reduction in the size of the press mold can be achieved.

Furthermore, by performing such temporary assembly and joining at multiple locations on the floor main 8 and the body side 9, the body side 9 is sufficiently firmly joined to the floor main 8, and the temporary assembly structure is connected to the vehicle body. Accidental falling off of the body side 9 during transport to and delivery to the assembly process 4 is effectively prevented.

On the other hand, the temporarily assembled structure carried into the car body assembly process 4 is moved slightly in the vertical and horizontal directions of the rejoining flanges 11 and 12 during accurate positioning of the floor main 8 and body side 9 by the positioning robot. Since the relative displacement of the two parts is allowed, it is possible to position both of them with the desired precision while leaving the temporarily assembled joint parts as they are.

Note that these also apply when the roof and other parts are also temporarily assembled and joined in accordance with the method of the present invention in the temporary assembly step 3.

Here, the sill inner panel 10 and the sill outer panel 11
The above-mentioned joining can be achieved, for example, by providing the pivoting pillar with a talin means for bending the tab I5 to the tab insertion portion 16 and folding it back.

FIG. 4 is a cross-sectional perspective view showing another embodiment of the tab and the tab insertion part, and the example shown in FIG. 4(a) is a tab 15a.
Both of the front shapes of the tab insertion portion 16a are inverted trapezoidal shapes.

According to this example, in contact with the rejoining flange 12.13, the tab 15a is folded back from above to below via the tab insertion part 16a, as in the previous example, in particular:
Accidental removal of the tab 15a from the tab insertion portion 16a can be sufficiently and effectively prevented based on the engagement between both side edges of the tab 15a and both side edges of the upper end portion of the tab insertion portion 16a.

In addition, in the example shown in FIG. 4 (1)), the tab 15 is formed by bending the tongue pieces separated from the joining flange 13 in the same manner as described in the third section by 90 degrees toward the other joining flange.
b, and a tab insertion portion 16b having a rectangular hole shape is formed on the joining flange 12. Here, while the tab 15b is inserted into the tab insertion portion 16b, the rejoining flange 12.13 is brought into surface contact, and then,
By further bending the tab 15b downward by 90 degrees, both panels 10.11 can be folded down as shown in FIGS. 3 and 4 (
This results in a bond similar to the example shown in a).

In addition, in this example shown here, the tab insertion part 16b can also be made into the U-shaped tab insertion part 16 shown in FIG. As in the embodiment described above, it is possible to provide a sufficiently strong bond between the two panels 10, 11 without impairing any of the advantages inherent in the invention.

FIG. 5 is a diagram showing still another embodiment of the present invention.

This is the beginning of the joining work of both panels 10.11.
One joining flange 13 is left as it is, and the tab insertion part 16 is formed in advance on the other joining flange 12. In this example, the joining work of both panels 10.11 is performed by rejoining the flange 12.13. After bringing them into surface contact with each other, one joining flange 13 is turned into an inverted T as shown by the imaginary line in the figure.
By cutting in the shape of a letter, three pieces of tabs are formed surrounded by the cut line, and each of those tabs is then cut into a fifth piece.
As shown in Figure (b), this is done by passing through the tab insertion part 1G and turning back in the left and right direction.

FIG. 6 is a diagram illustrating such a joining process. Here, both joining flanges 12.13 are first clamped by the holder 22.23 of the press joining device 21, and then the joining flanges 12.13 are clamped by the holder 22.23 of the press joining device 21, and then By advancing the punch 24, the punch 24 and the die 2
5, cutting and forming three tabs 15c;
These tabs 15c are simultaneously bent into the tab insertion portion 16, and then, by opening the holder 23 located on the flange 12 side and advancing the die 25, at the edge of the die 25, Each tab 15c is sufficiently folded back in the left-right direction with the flange 12 in between.

According to this, although the same effects as those of the respective embodiments described above are brought about, the joining strength between both panels 10 and 11 can be further increased due to the action of the three tabs 15c, and each Since the tab 15c is folded back to the side, the joining flange 12 is placed below the tab insertion part 16.
It becomes unnecessary to form a protruding part.

Here, the shape of the tab insertion part can also be made into a rectangular hole shape as shown in FIG. 4(b).

(Effects of the Invention) Thus, according to the present invention, in particular, the tab is separated from either one of the two joining flanges by cutting and raising, etc., thereby eliminating the conventional method of providing the tab protruding from the tip of the joining flange. Compared to conventional technology, it is possible to completely prevent the generation of scrap caused by forming tabs, resulting in a significant improvement in material yield and, in turn, a reduction in product costs.In addition, The press mold can be made smaller and the equipment cost can be sufficiently reduced.

[Brief explanation of the drawing]

Fig. 1 is a route diagram showing a car body assembly line to which the present invention is applied; Fig. 2 is a perspective view illustrating the locations where the invention is applied; Figs. 3 to 5 are views showing embodiments of the invention. , FIG. 6 is a process diagram illustrating the joining process of the example shown in FIG. 5, and FIG. 7 is a diagram illustrating a conventional example.

Claims (1)

[Claims] 1. When joining two plate-shaped workpieces at their respective joining flanges, the tip surfaces are separated from either one of the joining flanges located in the same plane. A method for joining plate-like workpieces, characterized in that the tab is folded back through a pre-formed tab insertion portion on the other joining flange.