JPH0618651Y2 - Press molding equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a press forming apparatus that bends and forms a flange portion that is an inverse portion at an end portion of a panel-shaped work.

2. Description of the Related Art As a press forming apparatus of this type, there is, for example, a structure shown in FIG. In FIG. 5, 51 is a lower holder and 5
An upper holder 2 is attached to a press slide (ram) (not shown) and moves up and down together with the press slide.
Is a drive cam attached to the upper holder 52, and 54 is a pad elastically supported by the upper holder 52 via an elastic body so as to be vertically movable.

A movable punch 55 that is slidable in the horizontal direction is mounted on the lower holder 51. The movable punch 55 is provided with a punch block 56 and is connected to a piston rod 58 of a shift cylinder 57.
By the action of 7, it is possible to slide within the range of the stroke S. Reference numeral 59 is a stopper that regulates the forward limit position of the movable punch 55.

A slide cam 61 having a sectional die 60 at the tip is mounted on the movable punch 55 so as to be slidable in the horizontal direction. The slide cam 61 is retracted by a return spring mechanism (not shown) (to the right in FIG. 5).
Is given the ability to return to. 62 is a drive cam 53
The wear plate 63 is fixed to the lower holder 51, and the lifter 63 is provided on the lower holder 51 and pushes up the work W after flange forming to the upper side of the punch.

In the press molding apparatus configured as described above, the fifth
The work W is placed and positioned on the movable punch 55 and the fixed punch (not shown) at the positions shown in the figure, and then the upper holder 52 is placed.
To lower. When the upper holder 52 descends, first, the pad 54 presses and clamps the work W between the movable punch 55 and the fixed punch, and subsequently, the drive cam 53 slides between the inclined cam surfaces 53a and 55a, and then the drive cam 53 shown in FIG. To descend.

Then, when the upper holder 52 is still lowered, the wear plate 62 of the drive cam 53 makes sliding contact with the inclined cam surface 61 a of the slide cam 61, so that the slide cam 61 moves forward with respect to the punch block 56. As a result, the flange portion F is bent and formed at the end portion of the work W by the cooperation of the punch block 56 and the sectional die 60 on the slide cam 61 side.

When the upper holder 52 rises after the completion of the forming of the flange portion F, the slide cam 61 retracts in the direction away from the punch block 56 by the action of the return spring mechanism described above.

After that, the work W having the flange portion F formed is waited for the upper holder 52 to rise as described above, and then pushed up by the lifter 63 to the upper side of the punch. Is an inverse portion with respect to the work take-out direction and interferes with the punch block 56 as shown in FIG. 5, so that the work W can be pushed upward by the lifter 63 in the state of FIG. Can not.

Therefore, as described above, after waiting for the upper holder 52 to rise, the shift cylinder 57 is extended to move the movable punch 55.
The whole is slid by the stroke S in the direction of the arrow a (the stroke S is set to be larger than the length of the flange portion F in advance). As a result, the flange portion F is disengaged from the tip end portion of the punch block portion 56, and inverse interference is avoided, so that the work W can be pushed up by the lifter 63 for the first time. The work W pushed up by the lifter 63 is carried out of the mold by a handling device (not shown) (similar structure is disclosed, for example, in Japanese Utility Model Laid-Open No. 62-82122).

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional press molding apparatus, not only the slide cam 61 but also the movable punch 55 is slid with respect to the lower holder 51, and the shift cylinder 57 is required. Therefore, there is a problem that the mold structure becomes complicated and becomes large. In addition, the drive cam 53 must have a plurality of inclined cam surfaces 53a and 62a that are in sliding contact with both the movable punch 55 and the slide cam 61, so that the drive cam 53 itself becomes large, and the inclined cam surface is also increased. As a result, the machining of a relatively troublesome slope increases, the mold structure becomes complicated and the size increases, and the number of man-hours for manufacturing the mold increases, resulting in a rise in equipment costs.

The present invention has been made in view of the above problems,
It is an object of the present invention to provide a structure in which the interference of the flange portion can be avoided only by the operation of taking out the work above the punch while achieving the simplification and downsizing of the die structure.

Means for Solving the Problems The present invention provides a punch and a slide cam, which is driven by a drive cam and slides at the end of a work positioned on a punch which is a lower die, in response to a lifting operation of the upper die. By cooperation, in a press forming apparatus that bends and forms a flange portion that is an inverse portion when the work is taken out above the punch, a portion of the punch that is directly involved in forming the flange portion is divided as a movable punch,
This movable punch is characterized in that it can be rotationally displaced in a direction that avoids interference with the inverse part by following the work taking-out operation to the upper side of the punch.

The movable punch is rotatably connected to the punch body via, for example, a hinge or a leaf spring.

Action According to this structure, when a work on which flange forming has been completed is pushed up by, for example, a lifter as shown in FIGS. 1 and 3, the movable punch moves because the flange and the movable punch interfere with each other inversely. Following the above, it is rotationally displaced in a direction to avoid inverse interference. Then, when the movable punch rotates by a predetermined amount, the flange portion and the movable punch are disengaged from each other, and inverse interference is completely avoided.

Embodiment FIG. 1 shows a more specific embodiment of the present invention.
Is a lower holder, 2 is an upper holder, and a drive cam 4 having an inclined cam surface 3a constituted by a wear plate 3 is attached to the upper holder 2, and a pad 5 can be moved up and down via elastic means (not shown). It is elastically supported by. The upper holder 2, the drive cam 4, and the pad 5 form an upper mold 6.

The lower holder 1 is equipped with a slide cam 10 and a punch 11 in addition to a flitter 9 including a lift cylinder 7 and a lifter plate 8. The lower holder 1, the lifter 9, the slide cam 10 and the punch 11 form an upper mold. 12 are configured. The slide cam 10 is provided with a sectional die 13 at the tip as in the conventional case, and can slide horizontally on the lower holder 1, and the slide cam 10 is separated from the punch 11 by the function of a built-in return spring mechanism. Has been given a return force.

In addition, the punch 11 has an upper half portion directly involved in the molding of the flange portion F divided into movable punches 14, and the movable punch 1
Reference numeral 4 is connected to the punch body 15 via a hinge 16 so as to be rotationally displaceable in the counterclockwise direction in FIG. The dividing surface 17 between the movable punch 14 and the punch main body 15 is formed in a step shape as shown in FIG. 1, and when the flange portion F is formed, the movable punch 14 and the punch main body 15 are in close contact with each other at the dividing surface 17. At the same time as functioning as the integrated punch 11, the flange forming force from the horizontal direction by the slide cam 10 is received by the vertical wall surface 18 on the punch body 15 side so that the flange forming force is not directly applied to the hinge 16.

In the press molding apparatus configured as described above, the second
As shown in the figure, the work W is positioned on the punch 11 and then the upper holder 2 is lowered. When the upper holder 2 descends, the pad 5 first presses and clamps the work W with the punch 11 as shown in FIG. 1, and the upper holder 2 descends to tilt the wear plate 3 of the drive cam 4. The cam surface 3a comes into sliding contact with the inclined cam surface 10a of the slide cam 10. The slide cam 10 moves forward with respect to the punch 11 due to the slidable contact between the inclined cam surfaces 3a and 10a, and the flange portion F is bent and formed at the end of the work W by the cooperation of the sectional die 13 and the movable punch 14. It

When the forming of the flange portion F is completed, the upper holder 2 is raised again, the slide cam 10 is retracted by the action of the return spring mechanism (not shown), and the pad 5 is also separated from the work W.

Then, when the lifter plate 8 is lifted by the action of the lift cylinder 7 after waiting for the upper holder 2 to rise as described above, the work W is moved above the punch 11 by the return plate 8 as shown in FIG. Pushed up. At this time, since the flange portion F as an inverse portion is in close contact with the movable punch 14 and interferes with the movable punch 14, the movable punch 14 follows the movement of the work W and rotates about the hinge pin 19 as a center of rotation, as shown in FIG. It is rotationally displaced in a clockwise direction, that is, a direction in which inverse interference is avoided.

As the movable punch 14 is rotationally displaced in this way, the amount of interference with the flange portion F is gradually reduced, and when the movable punch 14 is rotationally displaced by a predetermined amount, the flange portion F is completely disengaged from the movable punch 14. Inverse interference is avoided. After that, the work W is independently pushed up to a predetermined height position by the lifter plate 8 without the movable punch 14, while the movable punch 14 is rotationally displaced in the clockwise direction of FIG. Return to the state of. Then, the work W pushed up to the predetermined height position is carried out of the mold by, for example, a handling device (not shown).

As described above, according to the present embodiment, only the lifting operation of the work W by the lifter 9 causes the flange portion F and the punch 1 to move.
Inverse interference with 1 can be avoided.

Here, as a means for connecting the movable punch 14 to the punch body 15 in a rotationally displaceable manner, the same effect can be obtained by using the leaf spring 20 as shown in FIG. 4 instead of the hinge 16.

As described above, according to the present invention, the portion of the punch directly involved in the molding of the flange portion is divided into movable punches,
Since the movable punch is configured to be rotationally displaceable in a direction to avoid the inverse interference by following the work taking-out operation above the punch, the inverse interference can be substantially avoided only by the work taking-out operation above the punch. Therefore, it is not necessary to slide a large-sized movable punch equipped with a slide cam as in the prior art, and a shift cylinder is not necessary, so that the mold structure can be greatly simplified and downsized.

In addition, the drive cam can be downsized because the drive cam only needs to have an inclined cam surface corresponding to the slide cam, and the number of inclined cam surfaces can be reduced, which can reduce the number of man-hours required for relatively inclined surfaces. The facility cost can be suppressed as well as the simplification and downsizing of the entire structure.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the present invention, which is a cross-sectional explanatory view at the time of bottom dead center of the upper die, FIG. 2 is a cross-sectional explanatory view of essential parts at the time of top dead center of the upper die, and FIG. FIG. 4 is a cross-sectional explanatory view of a main part at the time of ascending operation, FIG. 4 is a cross-sectional explanatory view of the main part of another embodiment of the present invention, and FIG. 5 is a structural explanatory view showing an example of a conventional press molding apparatus. 1 ... lower holder, 2 ... upper holder, 4 ... drive cam, 5 ... pad, 6 ... upper mold, 9 ... lifter, 10
...... Slide cam, 11 ...... Punch, 12 ...... Lower mold, 1
4 ... Movable punch, 15 ... Punch body, 16 ... Hinge, 20 ... Leaf spring, F ... Flange part, W ... Work.

Claims (1)

[Scope of utility model registration request] 1. A punch above a punch by the cooperation of a slide cam and a slide cam which is driven by a drive cam and slides at the end of a work positioned on the punch as a lower die in response to an elevating operation of the upper die. In a press forming apparatus that bends and forms a flange portion that is an inverse portion when a work is taken out of a punch, a portion of the punch that is directly involved in forming the flange portion is divided as a movable punch. A press forming apparatus characterized in that the press forming apparatus is configured to be rotationally displaceable in a direction that avoids interference with an inverse portion by following an upward work taking-out operation.