JPS6310027A - Joining device for plate shaped part - Google Patents

Abstract

PURPOSE:To simplify the die structure of a joining device by pulling a bulging part out by a knockout after biting the bottom part of the bulging part into the outer face side with its spreading by forming a bottomed cylindrical bulging part by a punch on plural overlapped plate shaped parts. CONSTITUTION:Both flange part 11a and 11b (plate shaped part) of an external plate 11 are placed on a die 15. With the descent of a punch 14 together with a pressing member 17 the flange parts 11a, 11b are drawn by the cooperation action of the punch 14 and die hole 18 and a cylindrical bulging part 19 is formed with drawing. The bottom part of the bulging part 19 is strongly pressed in the space with the die hole 18 bottom part with further descent of the punch 14 and spreaded in the horizontal direction. In this way, the bottom part of the bulging part 19a of the flange part 11a is bitted into the bulging part 19b and both flange parts are combined. The bulging part 19 is then pulled out by a knockout 16. With this mechanism the die structure can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a joining device for plate-like parts that joins plate-like parts by a type of press forming.

(Prior Art) Conventionally, in order to join a plurality of plate materials, a method of joining by spot welding, a method of joining by rivets, screws, etc. has been used.

By the way, recently, so-called colored steel plates whose surfaces are pre-painted have been widely used, but since the paint on the surfaces is not conductive, they cannot be joined by spot welding. Furthermore, when using rivets or screws, it is necessary to prepare holes in the plate material for the rivets or screws to pass through, and the work of tightening the rivets and screws is troublesome.

As shown in FIG. 7, there is a device that can solve these problems by joining a plurality of plate materials by a type of press forming. However, with this joining device, 2
A cylindrical bulge 3 is formed by drawing on the two plate materials 1 and 2, and then the bottom of the bulge 3 is inserted into the bulge 3.
is deformed into a tapered cylindrical shape whose diameter increases toward the bottom force, thereby joining the two plates 1 and 2 inseparably, so that the tapered bulge 3 is inserted into the die hole. In order to extract the die from the die 4, the die 5 must have a structure that can be expanded and contracted, which tends to make the structure complicated. In addition, the bulge 3
The structure for extracting the die 5 from the die hole 4 is such that the knockout pin 6 is moved upward by the elastic force of the compression coil spring 8 as the punch 7 rises. If the thickness of the side becomes large and the plate materials to be joined are formed in a flat box shape, the die 5 side cannot be inserted into the inside thereof, and joining will not be possible.

(Problems to be Solved by the Invention) As mentioned above, in the conventional apparatus for joining plate parts by a type of press forming, the structure of the die is complicated, and
The thickness dimension on the die side becomes large, and depending on the shape of the plate-like parts to be joined, joining may not be possible.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a joining device for plate-like parts that can simplify the structure of the die and reduce the thickness of the die side.

[Structure of the Invention] (Means for Solving the Problems) The device for joining plate-like parts of the present invention is provided with a die having a die hole, and is moved relative to the die to connect with the die hole. By working together, a cylindrical bulge with a bottom is formed by drawing on the stacked plate parts, and the bottom of the bulge is strongly pressed against the bottom of the die hole to form the inner surface of the bulge. A punch is provided which expands the bottom of the bulge of the plate-like part and bites into the bulge of the plate-like part on the outer surface side of the bulge, and the punch is rotatably supported and by its rotation, the plurality of This configuration is provided with a knockout for moving the plate-shaped part in a direction away from the die and extracting the bulge existing in the direction of the die.

(Function) A plurality of plate-shaped parts are set on the die in an overlapping state, and the punch is moved relative to the die.

Then, first, bottomed cylindrical bulges are drawn on the plurality of plate-like parts.

Next, the bottom of the bulge is strongly pressed between the punch and the bottom of the die hole, and the bottom of the bulge on the inner surface of the bulge expands laterally. It bites into the swollen portion of the plate-like portion on the outer surface side. This biting joins the plurality of plate-shaped parts inseparably.

After joining, when the knockout is rotated, the plate-shaped portion moves in a direction away from the die, and the bulging portion is pulled out from the die hole.

According to this joining device, a plurality of plate-like parts can be joined without having to make the outer periphery of the bulging part tapered so that the diameter increases toward the bottom force, so that the structure of the die can be simplified.

Furthermore, since the knockout causes the plate-shaped portion to move away from the die by a rotational action, there is no need to provide a mechanism below the die for operating the knockout.

(Example) An example of the present invention will be described below based on FIGS. 1 to 6.

First, FIG. 6 shows the door outer panel 11 of a refrigerator. This door outer panel 11 is formed into a flat box shape from a so-called colored steel plate, and has flange portions 11a facing inward at the tips of its four sides.
The lid is bent. This embodiment is applied to the case where both ends of the flange portion 11a to the lid of the door outer panel 11 are joined in a superimposed state. Note that a door inner plate (not shown) is attached to the flange portion 11a to the lid of the door outer plate 11, and a heat insulating material is filled between the door outer plate 11 and the door inner plate to form a refrigerator door. be done.

In FIG. 5 showing the bonding apparatus, a substantially prismatic holder 13 extends downward from the base frame 12, and a support 13a is provided on one side of the lower end of the holder 13. A punch 14 is provided on the base frame 12 so as to be movable up and down, and on the other hand, a die 15 is arranged and fixed on the support of the holder 13 on a stand 13a located directly below the punch 14. Further, a knockout 16 having a substantially U-shaped frame is supported at the lower end of the holder 13 so as to be rotatable in the vertical direction, and a hole 16a is formed in a part of the corner of the knockout 16. The knockout 16 is normally in a downwardly rotated position, the receiver is placed on the stand 13a, and the die 15 is fitted into the hole 16a.

In FIG. 1 showing the details of the punch 14 and die 15, there is a presser member 17 at the lower end of the punch 14 for pressing and fixing the plate-shaped part to be joined onto the die 15, which is movable downward. It is fitted. This pressing member 17 is always urged downward by a spring (not shown). On the other hand, the die 15 has a cylindrical shape with a bottom, and a die hole 18 is formed inside the die 15 .

Next, the operation when the flange portions 11a to 11d (plate-like portions) of the door outer panel 11 are joined by the joining device having the above configuration will be described. First, as shown in FIG. 5, the door outer panel 11 is placed so that the flange portions 11a to 11d are facing upward, and the receiver is placed so that the base 13a is aligned with the flange portions 11a and 11d, for example.
Both flange portions 11a are inserted into the inside of b.
and 11b are placed on a die 15'' as shown in FIG.

In this state, the punch 14 is lowered together with the presser member 17. Then, the holding member 17 presses the flange portions 11a, l'lb
The pressing member 17 is pressed and fixed onto the die 15 by coming into contact with it, and the pressing member 17 itself is prevented from further lowering.

After this, the punch 14 is lowered independently, so that the flange portions 11a and llb are lowered by the punch 1, as shown in FIG.
4 and the die hole 18, it is squeezed and bulges into the die hole 18, and a cylindrical bulging portion 19 is formed by drawing.

Now, in the punch 14, the outer bottom of the bulging part 19 is located at the die hole 1.
After contacting the bottom of the die hole 18, the punch 14 continues to descend by a certain amount, and as a result of this downward movement, the punch 14 strongly presses the bottom of the bulge 19 with the bottom of the die hole 18. Then, the bottom of the bulge 19 is swaged in and spread out in the lateral direction. However, since the bulging portion 19 fits into the die hole 18,
Even if it receives a force on the outside in the radial direction due to the above-mentioned expansion, the bulged portion 19
It does not deform so that its outer diameter increases.

As a result, the bottom of the bulge 19a of the flange portion 11a on the inner side of the bulge 19, that is, the flange portion 11a on the "-" side, is expanded and protrudes laterally, causing the bulge to bulge as shown in FIG. A flange portion on the outer surface side of the protruding portion 19.

That is, it comes to bite into the bulge 19b of the lower flange portion 11b. Then, due to this biting, both the flange portions 11a and llb are joined together inseparably.

Thereafter, when the end 16b of the knockout 16 opposite to the die 15 side is pushed down and the knockout 16 is rotated upward as shown by the arrow 20 in FIG. Since the bulging portion 19 is pushed up and away from the die hole 18, the bulging portion 19 is pulled out from the die hole 18.

After the flange portions 11a and 11b are joined as described above, the unjoined flange portions are sequentially joined in the same manner.

According to this embodiment, the bulging portion 19 does not deform into a tapered shape that increases in diameter toward the bottom force, so in order to extract the bulging portion 19 from the die hole 18, the die 1 is
There is no need to configure 5 so that it can be expanded and contracted. Therefore, it is sufficient to simply form the die 15 as a cylinder with a bottom, as shown in this embodiment, for example.
The structure becomes simple.

Moreover, since the knockout 16 is rotatably supported, the bulge 19 can be pulled out from the die hole 18 by pushing down the end 16b on the side opposite to the die 15 side. Therefore, unlike a structure in which the knockout is pushed up from below the die, there is no need to provide a mechanism for pushing up the knockout 16 below the die 15, and the thickness on the die 15 side can be reduced accordingly. Therefore, the receiver can insert the base 13a, the die 15, and the knockout 16 inside the flange portions 11a to lid of the flat outer plate 11, making it possible to join them.

Note that the shape of the die hole 18 may be tapered so that the diameter increases toward the top (therefore, the shape of the bulging portion 19 is tapered so that the diameter decreases toward the bottom force). Further, in the two-legged embodiment, the punch 14 moves up and down, but the die 15 may move up and down. Furthermore, in the above embodiment, the flange portion 11a of the door outer panel 11 to the lid
Although the description has been made by applying the method to the case of joining two plates together, it goes without saying that it can also be applied to the case of joining a plurality of flat plates.

[Effects of the Invention] As explained above, according to the plate-shaped part joining apparatus of the present invention, in order to join a number of plate-shaped parts, the bulged part is drawn and formed using a die and a punch. When the bottom of the die is swaged, the outer periphery of the bulge does not deform to increase in diameter in response to the bottom force, so there is no need to make the die expandable and contractible, which simplifies the structure of the die. In addition, since the knockout is rotatably provided, there is no need to provide a mechanism below the die to rotate the knockout in order to pull out the bulge from the die hole, which reduces the thickness of the die side. This has excellent effects such as being able to reduce the size of the plate-shaped parts to be joined and ensuring reliable joining even when the space for inserting the die is small due to the shape of the plate-like parts to be joined.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional side view of the main part, FIGS. 2 to 4 are longitudinal sectional side views of the main part shown in the order of the joining process, and FIG. FIG. 5 is a perspective view of the entire refrigerator, and FIG. 6 is a perspective view of the outer panel of the refrigerator door. Moreover, FIG. 7 is a longitudinal sectional side view showing an example of a conventional joining device. In the figure, 11 is the door outer plate, lla to lid are the flange parts (
13 is a holder, 14 is a punch, 15 is a die, 16 is a knockout, 18 is a die hole, and 19 is a bulging portion. Applicant iL Corporation Toshiba Figure 1 Figure 2 Figure 3. . Figure 6

Claims (1)

[Claims] 1. A die having a die hole and a cylindrical bulging portion with a bottom are drawn and formed on a plurality of overlapping plate-like portions by moving relative to the die and collaborating with the die hole. The bottom of this bulging part is strongly pressed between the bottom of the die hole and the bottom of the bulging part on the inner surface of the bulging part is expanded to form a plate-like part on the outer surface of the bulging part. and a knockout that is rotatably supported and moves the plurality of plate-shaped parts in a direction away from the die to extract the bulge existing in the die hole. A joining device for plate-like parts, comprising: