JPH031084B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bending press die that allows bending of opposing inverse flanges of a panel opening in the same upper holder lowering stroke.

As a conventional bending press die, for example, the first
There is something like the one shown in the figure. 1 is a lower holder attached to the bolster of the press; 2 is an upper holder that is part of the upper die attached to the slide of the press that performs molding processing by descending; 3 is a drive cam attached to this upper holder 2; 4 is a collapse cam that can slide on the lower holder 1 in the forward direction F and the backward direction R. An insert punch 5 for bending is fixed inside the front end of the collapse cam 4, and a sectional die 6 that cooperates with the insert punch 5 is attached to the collapse cam 4.
The upper portion thereof is fixed to the front end of a slide cam 7 which slides in the forward direction F by the cam action of the slope 3a in front of the drive cam 3. 7a is the slope 3
This is the mating slope of the slide cam 7 for a. 8 is an elastic spring device for returning the slide cam 7 that has moved forward to the rear, and 9 is an elastic spring device for returning the collapse cam 4 that has moved backward to the front. 1
0 is a pad attached to the upper holder 2 via a spring (not shown) so as to be movable relative to the upper holder 2, and forms an inward flange processing part A together with the insert punch 5 and the sectional die 6. There is. 3c and 4c are drive cams 3 respectively
and fixed to the collapse cam 4 and each cam slope 3
This is a slide block including b and 4b. Further, the collapse cam 4 may be slid by an air cylinder 11, which is shown as a reference by a phantom line.

FIG. 2a is a sectional view taken along the line BB of the window opening of the right rear door inner 13 of a passenger car, showing an example of the workpiece 12 to be bent. 14 is the first
The inward flange 15 is a second inward flange facing each other (hereinafter simply referred to as a first and second flange), and 14a and 15a each show a preformed cross section of the flange portion before inverse forming. Further, C and D indicate the ranges in which the first and second flanges 14 and 15 are to be formed.

When machining the first flange 14 portion first, the workpiece 12 is set on the insert punch 5 in advance. When the upper die descends, the pad 10 first presses the vicinity of the first flange 14 of the work 12,
Then, the drive cam 3 moves the slide cam 7 in the forward direction F by the cam action of the slopes 3a and 7a, and the sectional die 6 and insert punch 5 at the front end perform inverse bending of the first flange 14. . The figure shows the completed state of this process.

However, in such conventional bending press dies, bending is performed simply by a combination of a punch 5, a die 6, and a pad 10, and one flange portion is formed in one forming operation. Since the structure is such that only machining can be performed, there was a problem in that machining of the opposing flange on the other side had to be performed in a separate process.

This invention was made with attention to such problems, and in addition to the above-mentioned conventional combination of a punch, die, and pad for processing the first flange, the rear end of the collapse cam also includes a Combinations of opposing punches, dies, and pads for machining the second flange are provided, and the bending process of the second flange part is performed prior to the machining of the first flange part using backward movement of the collapse cam. This is intended to solve the above problem by making it possible to simultaneously bend opposing inward flange portions in the same process.

The present invention will be explained below based on the drawings.

FIGS. 3 to 8 are diagrams showing one embodiment of the present invention. The bending press mold of this invention is
Basically, the structure is almost the same as the conventional example described above, except for the related mechanisms such as the newly added punch, die, and pad for second flange processing, and the structure is the same as the conventional example. are indicated by the same symbol. 1 is a lower holder, 2a is an upper holder that reciprocates up and down, and A is a first flange processing part. On the lower holder 1,
It includes a collapse cam 4a that fixes an insert punch 5 for bending the first flange 14 portion of the workpiece 12, and a slide cam 7 that slides on the collapse cam 4a in the forward and backward directions F and R, respectively,
The collapse cam 4a is configured to be able to slide on the lower holder 1 in the forward and backward directions. A drive cam 3 is fixed to the lower end of the upper holder 2a, and the drive cam 3 has a cam slope 3a on its front surface.
Further, a slide block 3c having a cam slope 3b on the rear surface is fixed. A mating cam slope 7a for the slope 3a is provided on the rear surface of the slide cam 7, and a slide block 4c having a mating cam slope 4b opposite to the slope 3b is fixed inside the rear end of the collapse cam 4a. Further, a sectional die 16 for bending the second flange 15 is fixed to the outside of the rear end of the collapse cam 4a, and a sectional die 6 for bending the first flange 14 is fixed to the front end of the slide cam 7. fixed, and further the said sectional die 1
A fixed punch 17 is erected on the frame 1 behind the sectional die 6 and facing the sectional die 16. 10 and 10a are each flange 1 of the workpiece 12
These pads are used to hold down portions 4 and 15 from above during machining, and are mounted so that they can slide vertically on each side slideway of the upper holder 2a via spring devices 18 and 18a, respectively. Reference numeral 8 indicates an elastic spring device for returning the slide cam 7 that has moved in the forward direction F to the backward direction R, and 9 indicates the reverse direction R.
An elastic spring device is used to return the collapsed cam 4a that has been moved to the forward direction F, and 19 and 20 are stoppers that respectively limit the range of movement of the collapse cam 4a in the front and back direction. This is a stopper for limiting.

Next, the effect will be explained.

In FIG. 4, the preformed panels of workpiece 12 are set in the positions shown. In FIG. 5, when the upper holder 2a descends, the pad 1 first
0a holds down the vicinity of the second flange 15 of the work 12 from above. When the upper holder 2a further descends, the slope 4b on the slide block 4c of the collapse cam 4a and the slope 3b on the slide block 3c of the drive cam 3 come into contact, and due to the cam action, the collapse cam resists the force of the elastic spring device 9. 4
Move a in the backward direction R, and press the sectional die 1.
6 is brought into contact with the second flange 15. At this time, the cam driver 3 and each slope 3a, 7a of the slide cam come into contact with each other. When the upper holder 2a further descends, the sectional die 16 moves backward as shown in FIG. 6, and the bending of the inverse portion of the second flange 15 is completed. This is the front-back position. On the other hand, the slide cam 7 is in the process of moving forward against the force of the elastic spring device 8. In FIG. 7, when the upper holder 2a further descends, the collapse cam 4a
In this case, each slide block 3c, 4c has a slope 3b,
4b and abuts on each vertical surface, so it is held in the same normal position as in Fig. 6, and pad 1
0 presses the vicinity of the first flange 14 of the workpiece 12 from above, the slide cam 7 further moves forward, and the sectional die 6 starts forming the inverse portion of the first flange 14. FIG. 8 shows a state in which the upper holder 2a has reached the bottom dead center and all molding has been completed.

Next, regarding the ascending stroke of the upper holder 2a to remove the completed workpiece 12 from the mold, the order of operation is the reverse of the above-mentioned descending stroke, and when the upper holder 2a is raised from the state shown in FIG. , the drive cam 3 rises, and the slide cam 7 moves in the backward direction R on the collapse cam 4a by the elastic spring device 8.
gradually return. When the upper holder 2a further rises, the vertical surfaces of the slide blocks 3c and 4c come out of contact and the slopes 3b and 4b come into contact with each other, and as the upper holder 2a rises, the collapse cam 4a is gradually moved by the elastic spring device 9. Return to forward direction F. Further, each pad 10, 10a is gradually released from pressure contact with the workpiece 12, and each part returns to the position shown in FIG. 4 when the upper holder 2a reaches the top dead center, and the processed workpiece 12 is removed. Can be done.

As explained above, according to this invention,
In addition to the conventional combination of a set of insert punches, sectional dies, and pads for machining the first flange provided on the inside of the front end of the collapse cam, there is also a set of insert punches for machining the second flange located on the outside of the rear end of the collapse cam. A combination of a sectional die, a fixed punch, and a pad is provided, and the sectional die for the second flange is actuated by utilizing the backward motion caused by the lowering of the drive cam. The flange is machined, and then the first flange is machined by the advance of the slide cam, so the inverse portion of the opposing flange can be bent in one forming operation by the same upper holder lowering stroke. The number of processing steps can be significantly reduced compared to conventional bending press dies.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view in the longitudinal direction of the main part showing the state in which the processing of the first flange part is completed in a conventional bending press mold, and Fig. 2 a and b are examples of the workpiece to be formed. FIG.
The figure is a plan view showing an outline of the lower die arrangement of the bending press mold of the present invention, and FIG. 4 is an enlarged vertical cross-sectional view showing the bending start standby state including the upper die portion taken along the line - in FIG. 3. , FIG. 5 and FIG. 6 are cross-sectional views showing each step until the forming of the second flange in FIG. FIG. 3 is a cross-sectional view showing each step until all molding steps are completed. 1...Lower holder, 2, 2a...Upper holder, 3...
...Drive cam, 4, 4a... Collapse cam, 5
...Insert punch, 6, 16...Sexual die, 7...Slide cam, 10, 10a...
Padded, 12...Work, 14...First inward flange, 15...Second inward flange, 17...
Fixed punch, A... Inward flange processing section.

Claims (1)

[Claims] 1. Equipped with an inward flange processing section consisting of a combination of an insert punch provided on the inside front end of the collapse cam, a sectional die provided on the front surface of the slide cam, and a work holding pad provided on the upper holder, and when the drive cam is lowered, the collapse cam and In a bending press mold that bends an inward flange portion of a panel frame having an opening by sliding slide cams on the collapse cam in opposite front and rear directions, the rear end of the collapse cam is bent. A sectional die is provided on the outside, a fixed punch is provided upright on the lower holder facing the sectional die, and a pad for holding down the workpiece is provided on the upper holder, and a second opposing die is provided using the backward movement of the collapse cam. A bending press type that is characterized by bending an inward flange.