JPS5925554Y2 - Workpiece positioning device in bending process - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a workpiece positioning device used for bending.

When bending the end of a plate material (hereinafter referred to as press work) using a press to form a flange, etc., the movement of the upper mold die is used to position the press work and the lower mold is bent without using a separate cylinder device. Conventionally, the following devices have been used to push up from the punch.

That is, as shown in FIG. 1, the upper die 1' holds the presser 2' in a vertically movable manner, and
' is urged downward by a spring 3', while a guide hole 7' extending vertically is formed in the lower die fixing part 6' on the side of the lower die punch 5' on which the press work 4' is placed. Then, the reference metal 8', which is slidably inserted into the guide hole 7', is inserted into the spring 9'.
It was biased upward by the force.

In this type of device, when the reference metal 8' is at the positioning position shown in the figure, the end face of the press work 4' is brought into contact with the reference surface 8'a of the reference metal 8' to position it, and from this state lowering the upper die 1' and lowering the reference metal 8' via the button 10' fixed to the upper die 1';
Press work 4' is performed by upper die 1' and lower die punch 5.
Bend the end 4'a.

When the press work 4' is bent, it is fixed by being pressed toward the lower die punch 5' by the presser 2', and the press work 4' can be removed from the lower die punch 5' after a new song. This is accomplished by bringing the push-up surface 8'b of the reference metal 8', which rises as the upper die 1' rises, into contact with the lower surface of the bent end of the press work 4'.

However, in the conventional apparatus as described above, the press work is not accurately fixed by the press work 2 at the beginning of bending the press work 5', and therefore, accurate bending cannot be expected.

That is, when removing (raising) the press work 4' from the lower die punch 5' after the bending process, the preflexor 2'
The pressure on the press work 4' must be released, but if this is done, the pressure on the press work 4' must be released immediately before the bending process is performed, that is, when the second die 1' starts pressing down the reference metal 8'. , the press work 4' is separated from the press work 4' by a gap S (this gap S is longer than the length of the bent part of the press work 4'), so that the press work 4' is firmly This is because it will not be fixed.

This inconvenience is caused by the fact that when the upper die 1' and the reference metal 8' are in contact with each other via the bushing 10', they operate as one unit.

It is an object of the present invention to provide a workpiece positioning device for bending that eliminates the above-mentioned problems.

The present invention, which is distantly related to this object, employs the same basic configuration as the conventional device described above, but has the following features that differ from the conventional device.

That is, the positioning device of the present invention has, firstly, a type of click mechanism that temporarily fixes the reference metal at the positioning position, and second, an elastic member is provided between the reference metal and the upper die. It is characterized by:

In the present device as described above, as the upper die descends, a downward force is initially applied to the reference metal only through the elastic member, but this is stopped by the click mechanism. , the reference gold does not descend until the prefixer presses against the presswork.

The presswork is therefore firmly fixed by the prefixer before the bending force is applied.

After this, the upper die directly presses the (rigid) reference metal downward without using an elastic member, but the pressing force at this time is so large that the click mechanism cannot stop the catch and the reference metal descends.
Press work is bent.

After this, when the upper die rises, the reference metal also tries to rise, but at this time, the elastic member (corresponding to spring 9' in Fig. 1) disposed between the upper die and the reference metal Against,
The rise of the reference metal is suppressed so that the reference metal does not come into contact with the lower surface of the bent end of the press work until the presser reaches the position where the pressure on the press work is released.

After the pressure on the press work by the prefuser is released, the reference gold also rises as the upper die rises.
The reference metal raises the press work from the lower die punch.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a workpiece positioning device for bending according to an embodiment of the present invention.

A preflexer (plate holder) 3 is held in the upper die 1 so as to be movable up and down at a position above the lower punch 2, and the preflexer 3 is always urged downward by a spring 4.

A guide hole 6 is formed in the lower die fixing member 5 on the side of the lower die punch 2 .

The guide hole 6 extends in the vertical direction and has a natural shape that opens upward.

A reference metal 7 is fitted into the guide hole 6 so as to be vertically movable, and in this embodiment, the reference metal 7 is constructed by integrating a lower block 7A and an upper block 7B.

The reference metal 7 is urged upward by a spring 8 housed in the guide hole 6, and in its positioning position shown in FIG.
The push-up surface 7a lightly contacts the lower surface of the end 9a of the press work 9 placed on the upper surface of the lower die punch 2, and also touches the reference surface 7.
b comes into contact with the end surface of the press work 9.

The reference metal 7 also has an upper protrusion 7C, the upper surface of which serves as a lowering upper surface 7d that comes into contact with the upper die 1.

In order to temporarily fix the reference metal 7 at the positioning position,
A click mechanism 10 is provided.

This click mechanism 10 will be explained in detail using FIG. 3.

A recess 11 is formed in the side surface of the reference metal 7, and a storage hole 12 is formed in the lower mold fixing member 5 so as to face the side surface of the reference metal 7.

A pin 13 and a spring 14 as a retainer are housed in this housing hole 12.

This spring 14 has a seat at one end as a pin 13, and a seat at the other end as a plug screwed into the storage hole 12.
As a result, the pin 13 is urged toward the reference metal 7 by the spring 14.

Such a pin 13 fits into the recess 11 when the reference metal 7 is at the positioning position, and prevents the reference metal 7 from rising any further.

The upper surface of the recess 11 is inclined downward as it goes deeper into the interior.

In other words, in FIG. 2, the inclined surface 11a is inclined upward as the distance from the lower die punch 2 increases.

Therefore, the reference metal 7 is temporarily fixed at the positioning position by the above-mentioned click mechanism 10, but when a large force is applied to the reference metal 7 from above, the pin 13 is moved into the storage hole 12 due to the inclination direction of the inclined surface 11a. Completely retreat inward and recess 11
The fitting to the reference metal 7 is released, and the reference metal 7 can be lowered.

A spring 16 is interposed between the reference metal 7 and the upper die 1, and this spring 16 applies the downward force of the upper die 1 when the upper die 1 is initially lowered. The information is transmitted to the reference metal 7 elastically.

Hereinafter, the operation of the apparatus of this embodiment having the above structure will be explained with reference to FIGS. 4 to 9.

First, as shown in FIG. 2, the press work 9 is placed on the upper surface of the lower die punch 2 with the upper die 1 raised sufficiently, and its end surface is brought into contact with the reference surface 7b of the reference metal 7 to position it. do.

When the upper die 1 is lowered after positioning the press work 9, the downward force of the upper die 1 is transmitted to the reference metal 7 only via the spring 16 at the beginning of the lowering.
The reference metal 7 is maintained in its position by a click mechanism 10.

Eventually, as shown in FIG. 4, the presser 3, which descends as the upper die 1 descends, begins to press the press work 9.

When the upper die 1 continues to descend after the presser 3 begins to press the press work 9, the lower surface of the upper die 1 eventually comes into contact with the lowering upper surface 7d of the reference metal 7, as shown in FIG. come into contact with

When the upper die 1 further descends, the reference metal 7
However, the click mechanism 10 cannot resist this large force, so the reference metal 7 descends together with the upper die 1, and the press work 9 is moved as shown in FIG. The end portion 9a is bent.

After bending the end 9a of the press work 9, the upper die 1
will rise, and along with this, the standard gold 7 will also rise.

However, just before the pressing surface 7a of the reference metal 7 contacts the lower surface of the bent end 9a of the press work 9, the downward biasing force of the spring 16 balances the upward biasing force of the spring 8. , the rise of the reference metal 7 is suppressed, and only the upper mold die 1 rises.

As the upper die 1 continues to rise, the pressa 3
When the pressure on the press work 9 is released as shown in FIG. 7 by rising, the balance between the spring 16 and the spring 8 is released, and the reference metal 7 begins to rise.

After this, as shown in FIGS. 8 and 9, the reference metal 7 rises as the upper die 1 rises, and its push-up surface 7a comes into contact with the lower surface of the bent end 9a of the press work 9. Then, the press work 9 is removed from the lower die punch 2.

Finally, by the click mechanism 10, the reference gold 7
is temporarily fixed at the positioning position.

Even after the reference metal 7 is temporarily fixed at the positioning position, the upper die 1
(Along with this, the presser 3) rises to its stroke end.

After this, the press work 9 can be removed from the lower die punch 2.

Of course, the press work 9 can be removed without the bent end 9a interfering with the lower die punch 2.

After the press work 9 is removed, the same operations as described above are repeated.

As is clear from the above, according to the device in question,
Whenever a bending force is applied to the end of the press work, the press work can be firmly fixed by the presser, and as a result, the bending process can be performed with high precision.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional device, Fig. 2 is a sectional view showing an embodiment of the present invention, Fig. 3 is an enlarged sectional view of a part of the embodiment of Fig. 2, and Fig. 4. - FIG. 9 is a sectional view showing the operation mode of the embodiment of FIG. 2. 1... Upper die, 2... Lower die punch,
3...Pretusa, 4.14.16...
Spring, 5...Lower mold fixing member, 6...Guide hole, 7...Reference metal, 9...Press work, 10...・Click mechanism, 11...
- Recess, 12...Storage hole, 13...Pin.

Claims (1)

[Scope of utility model registration request] A device that bends the end of the press work while positioning it, and also raises the press work by a predetermined amount after the bending is completed, and bends the end of the press work placed on the upper part of the lower die punch by lowering it. An upper die is provided, and the upper die holds a presser movably up and down, which is always urged downward by an elastic member and presses and holds the press work on the lower punch as the upper die descends; A reference surface that contacts the end surface of the press work before bending and positions the press work, a lowering upper surface that contacts the lower surface of the upper die after the presser holds the press work, and a lower surface that contacts the lower end surface of the bent press work. A reference metal having a push-up surface for pushing up the press work is supported on a side part of the lower die punch so as to be movable up and down via an elastic member, and is constantly urged against the side surface of the reference metal by the elastic member. , At the positioning position of the press work of the reference metal, a lower die is fixed with a retainer whose tip fits into a recess on the side surface of the reference metal, which has a sloped upper surface that slopes upward as it moves away from the lower die punch. An elastic member is disposed so as to be retractable from the upper surface of the reference metal and to raise the reference metal after the presser has been raised after bending the press work, between the upper surface of the reference metal and the lower surface of the upper die. A workpiece positioning device for bending processing, characterized by: