JPS6018235A - Method for fastening plateworked article and press die therefor - Google Patents

Abstract

PURPOSE:To perform formation of a box bent part and fastening of a corner with one stroke of pressing by exerting pressing force in the direction perpendicular to a bending direction to a piece to be bent and fastening the angle part formed of said piece and the other side plate by means of a caulking punch. CONSTITUTION:A box bent part 1 is placed on a knock-out 8. When a punch plate is lowered to lower a bending punch 11 and a cam 9, a piece 4 to be bent is bent square by the action of the punch 11 and a bending base 10 and at the same time a cam slider 15 is pushed forward by means of the cam 9. A projecting part 4 is wedged and caulked by a staking punch 5 provided to the tip of the slider 15. This operation is accomplished in one stroke by the simultaneous descending of the punch 11 and the cam 9.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method for fastening so-called box-bent parts (sheet metal molded products) in which a piece to be bent is bent and formed into a box shape, and a press die thereof.

(Prior art) Conventionally, in order to bend a sheet metal part and then connect the bent piece to another piece (side surface), the bending process is first performed by press working, and then the secondary process is welding. It is common to fasten using spot welding or arc welding.

In such a conventional example (1) Two processes are required: a pressing process and a welding process.

(2) Molded products deform due to thermal strain during bath welding.

(3) In the case of spot welding, it is only possible to fasten the molded parts in a manner that their planes are butt-to-plane, and it is necessary to have beam spaces on the back and front sides of the spot locations where the spot electrodes can be inserted.

There are drawbacks such as. Furthermore, a fastening method using burring caulking is also known, but this method has the disadvantage that it can only be fastened in a form where the flat surfaces of the molded product are fully butted.

(Purpose) The present invention has been made in view of the drawbacks of the conventional examples, and is a method for forming box bent parts and fastening corners (corner parts).
The object of the present invention is to provide a press mold that can be used in a press process and to provide such a press mold.

(Structure) The processing method of the present invention and the structure of its press die will be explained below based on the illustrated embodiment.

81! Figures 1 and 2 show the object of the present invention and a one-bulk box bent part.

First, FIG. 1 is an external view before processing, and the box bent part 1 has side plates (flanges) 2.3 standing up on the left and right, and further has a piece to be bent (flange) 4. 01ll board 2
．． 3 has protrusions 2a and 3a formed at the center of its tip,
On the other hand, holes 4a and 4b into which the protrusions 2a and 3a fit are formed in the overlapping piece 4.

FIG. 2 is an external view showing the state of the bent box part 1 after processing, and as shown in the figure, the piece 4 to be bent is bent at a right angle and makes contact with the side plates 2.3 at their end surfaces. Then, the projections 2a and 3ae are made to protrude from the holes 4a and 4b.

Then, by pressing the protrusions 2a, 3a with a caulking punch 5 having a sharp tip and cutting open from the center as shown in the figure, the protrusions 2a, 3a and the holes 4a, 4b are caulked. . Therefore, the side plate 2.3 and the bent piece 4 are fastened together at their corners.

Next, the structure of a press die that performs such processing in one step will be explained based on FIGS. 3 and 4.

FIG. 3 is a partial vertical sectional view of a press mold according to an embodiment of the present invention.

In the figure, 6 is a die plate, 7 is a cushion play +-, 12 for applying upward pressure to the knockout 8.
is a punch plate, 13 is a punching plate, and the backing plate 13 is provided with a bending groove (the punch 11 is movable up and down. 104 is a bending die. Punch play) 12Vc is a tip or a punching plate. Cam 9 became
is provided and is adapted to move downward together with the bending punch J1.

The caulking punch 5 is provided at the tip of a cam slider 15 that slides on one surface of the cam 9 and moves forward. The cam slider 15 is provided on the guide plate together with a fixed guide member 16, and a guide shaft 17 extends from the cam slider 15 through the guide member 16. By interposing the cam slider 15 as shown in the partial plan view, the cam slider 15 is normally pulled toward the guide member 16 side.

Then, as described above, the cam 9 descends and the cam slider 1
When the cam slider 15 hits the tapered surface 5, the cam slider 15 moves horizontally to the left in FIG. Therefore, as shown in FIG. 4, the protrusion 2a (or 3a) is caulked by the sharp end of the caulking punch 5 attached to the tip thereof.

Next, the box bending part 1 is
The method of processing in one step will be explained based on FIGS. 5 to 7.

First, FIG. 5 is a diagram showing the state before processing, in which the box-bent part 1 is placed on the knockout 8, so to speak, and thick arrows indicate the moving direction of each part (the same applies hereinafter).

FIG. 6 shows the process in which the bending punch 11 and the cam 9 are lowered by lowering the punch plate 12 from this state.

By the action of the bending punch 11 and the bending table 10, the folded part III
I. The barbed piece 4 is bent at a right angle, and the cam slider 15 is pushed forward by the cam 9.

As shown in Fig. 7, this cams writer 15
The wedge staking process of the medical origin 4 is performed using the staking punch 5 provided at the tip of the ! ;) Ru.

In fact, the above-mentioned operations are carried out in one step by simultaneous lowering of the bending/crunching 11 and the cam 9.

Note that it is also possible to use an air cylinder, hydraulic clip, etc. that includes this slider mechanism.

(Effects) The present invention is a method and apparatus as described above, and according to the present invention, in a sheet metal molded product (°C, the fastening of a part of the side corner of a box shape, etc. Pressing can be performed in the butted form, and box bending of the sheet metal and fastening of the molded product by wedge caulking can be performed in one step.

[Brief explanation of the drawing]

Figures 1 and 2 show plate molded products processed by the present invention. Figure 1 is an external view before processing, Figure 2 is an external view after processing, and Figures 3 and 4. The figures do not show a press mold according to an embodiment of the present invention;
The figure is a plan view of the same, and FIGS. 5, 6, and 7 are diagrams showing the state of the processing process. 1... Sheet metal molded product, 2, 3... Side plate,
4. Curved/folded piece, 5... Caulking punch,
9...Cam, 11...Bending punch. t"i figure 2z area? 30 74 figure age 5 figure o 6 area

Claims (2)

[Claims] (1) In a sheet metal molded product having a piece to be bent, a pressing force in a direction perpendicular to the bending direction is applied to the piece to be bent during the bending process, and the corner formed between the piece to be bent and the other side plate is fastened. A method for joining sheet metal molded products R7m. (2) It has a bending punch, a tapered cam that descends in conjunction with the movement of the bending punch, and a caulking punch that is moved perpendicularly to the bending punch by this cam and fastens the corners of the bent box part. Characteristic press mold.