JPS6334738Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in a forming device that folds back an end flange of a press work along an end opening.

(Prior Art) For example, a press die for forming a flange on a press work is shown in Japanese Utility Model Application No. 57-170824. On the other hand, a press work 1 as shown in FIG. 1a, which is used as a molding for an automobile, has a substantially U-shaped cross section, and an outwardly protruding depression 1b is formed at the lower end portion of one side 1a. This hollow 1
A substantially triangular end opening 1f defined by diagonally connecting the top 1c of the top 1c and the bottom corner 1e of the other side 1d is closed by the end wall 1g formed by drawing. As shown in FIG. 1b, the end flange 1i corresponding to the end opening 1h is bent outward from the diagonal side (bending part 1j) of the end wall 1g as a gripping part during drawing forming. The end flange 1i is bent into a bent portion 1 by a forming device.
j to the remaining end opening 1h as shown in Figure 1a.
I try to fold it back along the .

By the way, the conventional molding apparatus is
As shown in the figure, a fixed mold 2 having a forming surface 2a for forming an end flange 1i of a press work 1 on the end surface.
The press work 1 is set with the opening 1k facing downward. First, the presser 3 supported by the upper mold 4 that is moved up and down by the press ram is lowered to press the press work 1 against the fixed mold 2, and then the upper mold 4
The end flange 1i is folded back along the end opening 1h, but in order to smoothly set and reset the work 1 in the vertical direction, a portion 2b of the fixed die 2 corresponding to the recess 1b of the press work 1 is inserted. Since the depression 1b is formed as a vertical surface that does not interfere with the depression 1b and no molding surface is provided, the depression 1b is formed as a vertical surface that does not interfere with the depression 1b.
There was a problem in that the support at b was weak and the bent portion 1j of this portion of the end flange 1i could not be accurately folded back.

(Purpose of the invention) The present invention was made in order to solve the above-mentioned conventional problems, and it is possible to accurately fold back the bent part of the end flange of a press workpiece in which an outward recess is formed over the entire length. The purpose is to improve the quality of press work by devising ways to improve the quality of press work.

(Structure of the device) For this reason, the device basically fixes a rotary mold that has a convex portion on its circumferential surface that can be inserted into the depression of the press work, and has a molding surface for the end flange of the press work on its end surface. The rotary mold is rotatably supported by the mold, and the rotary mold is rotated so that the convex part is inserted into the recess at the beginning of the descent of the press ram. It is configured so that it can be folded back.

(Effects of the invention) According to the invention, the rotary mold supported by the fixed mold is rotated in the direction in which the convex part comes out of the recess when setting/resetting the press work, so the press work is pulled toward the convex part. Since there is no sticking, setting and resetting can be carried out smoothly. At the same time, during molding, the pressing member of the press ram rotates the convex part in the direction to insert it into the recess, so that the recess is rigidly supported by the convex part, and at the same time, the end of the recess Since the rotary die is located in the section, the end flange can be folded back against both the stationary die and rotating die molding surfaces while supporting the recess, and the bent section is accurately folded over the entire length, improving the quality of the press work. will improve.

(Example) As shown in FIGS. 4 and 5, the fixed die 10 of the molding device has a trapezoidal shape in which the press work 1 with the opening 1k facing downward is fitted and supported (set) from above. A mold part 11 is provided, and a recess cutout part 11a corresponding to the recess 1b of the press work 1 is formed in the fixed mold part 11.

A forming surface 11b of the end flange 1i of the press work 1 is formed on the end surface of the fixed mold part 11.

The fixed mold 10 is provided with a recess 13 extending over the recessed part 11a of the fixed mold part 11, into which a substantially disk-shaped rotary mold 12 is fitted.

The rotary mold 12 is connected to the fixed mold 1 by a bush 14.
The press work 1 set in the stationary mold part 11 is rotatably supported at the rotary mold part 12.
A convex part 12a that can be inserted into the recess 1b is provided, and the end face of the convex part 12a is set to be flush with the end face of the fixed mold part 11, and the press work 1 is formed together with the molding surface 11b of the fixed mold part 11. forming the molding surface 12b of the end flange 1i.

The rotary mold 12 is provided with a lever portion 12c,
A spring 15 interposed between the lever portion 12c and the fixed mold 10 urges the rotary mold 12 to rotate in the direction in which the convex portion 12a comes out of the recess 1b of the press work 1 (indicated by the two-dot chain line in the figure). be done.

On the other hand, a movable mold 16 located above the fixed mold 10
is attached to a press ram (not shown), and when the movable mold 16 is lowered, the fixed mold part 1 of the fixed mold 10 is attached to the movable mold 16.
Presser 17 presses press work 1 onto 1
is urged and supported in the downward direction by a spring 18.

The presser 17 includes a pressing member 19 that presses the lever portion 12c of the rotary die 12 against the spring 15 at the beginning of the descent of the press ram, and rotates the convex portion 12a in the direction in which it is inserted into the recess 1b of the press work 1.
will be provided.

In addition, the movable mold 16 has a molding surface 11b, 12b of the fixed mold 10 and the rotary mold 12 when lowered.
A movable mold part 20 is provided for folding back the end flange 1i of the press work 1.

If the press work forming apparatus is configured as described above, the movable mold 16 is initially in the raised position, and therefore the presser 17 is also in the raised position, and the pressing member 19 of the presser 17 is pressed against the lever portion of the rotary mold 12.
3c, the rotary mold 12 is separated from the spring 1
5, the convex part 12a becomes the depression 1 of the press work 1
It has rotated to the position where it comes out of b.

Then, the press work 1 is set on the fixed mold part 11 of the fixed mold 10 from above.

At this time, since the recess 1b of the press work 1 does not catch on the convex portion 12a of the rotary mold 12, the press work 1 can be set smoothly.

When the movable mold 16 starts to descend by the press ram, first, the presser 17 presses the press work 1 against the fixed mold part 11 and positions it, and the pressing member 19 of the presser 17 presses the lever part 12c of the rotary mold 12. The rotary die 12 rotates and the convex portion 12a is inserted into the depression 1b of the press work 1.

As a result, the recessed part 11 of the fixed mold part 11
a is now filled with the convex part 12a, and the molded surface 12b by the convex part 12a is also filled in the hollow missing part 11a.
is formed.

When the movable mold 16 further descends, the movable mold part 20
As a result, the end flange 1i of the press work 1 is folded back against the molding surfaces 11b and 12b of the fixed die 10 and the rotary die 12, and the end opening 1 of the press work 1 is folded back.
It comes to block 1 hour.

In this way, the recessed part 11a of the fixed mold 10
In this case, the molding surface 12b corresponding to the recess 1b of the press work 1 is formed by the rotary die 12, so the end flange 1i is attached to the bent portion 1 of this part.
j is folded back correctly.

When the movable die 16 rises, the presser 17 rises to release the pressing of the press work 1, and the pressing member 19 moves against the lever portion 12 of the rotary die 12.
Since the pressure of c is released, the rotary mold 12 is released from the spring 1.
5, the convex part 12a becomes the depression 1 of the press work 1
The recess 1b of the press work 1 does not catch on the convex portion 12a, so that the press work 1 can be reset smoothly.

[Brief explanation of the drawing]

Fig. 1a is a perspective view of the press work after forming, Fig. 1b is a perspective view of the press work before forming, Fig. 2 is a front sectional view of a conventional forming device, and Fig. 3 is a side view of Fig. 2. 4 is a front sectional view of the molding apparatus according to the present invention, and FIG. 5 is a side sectional view of FIG. 4. 1...Press work, 1a...Side part, 1b...
Hollow, 1f, 1h... End opening, 1i... End flange, 1k... Opening, 10... Fixed type, 1
DESCRIPTION OF SYMBOLS 1... Fixed mold part, 11a... Molding surface, 12... Rotating mold, 12a... Convex part, 12b... Molding surface, 15
... Spring, 16 ... Movable type, 17 ... Presser, 18 ... Spring, 19 ... Pressing member, 20 ...
Movable mold part.

Claims (1)

[Scope of Claim for Utility Model Registration] A forming device that folds back an end flange of a press workpiece having an outward recess formed on the side along the end opening, the inner surface of the press workpiece with the opening facing downward. a fixed mold that supports the fixed mold and has a molding surface for the end flange of the press work on its end surface; A rotating type has a molding surface for the end flange of the press work and is biased by an elastic member in the direction of the protrusion coming out of the recess, a fixed type that is moved up and down by a press ram and forms the end flange of the press work, and a rotating type. a movable mold that folds back against both molding surfaces; and a pressing member that is supported by the press ram via an elastic member and presses the rotary mold at the beginning of the descent of the press ram to rotate it in a direction in which the convex part is inserted into the recess. A press work forming device characterized by: