JPH06304660A - Device for changing mold length of press brake - Google Patents

Abstract

PURPOSE:To provide a press brake by which a change of mold length and an operation for exchanging with a different shape mold are easily and quickly carried out. CONSTITUTION:A ram 3 is attached with a plural number of center mold 5a and a split mold 5b through a movable clamp individually movable back and forth; a movable clamp is provided with a mold clamping part which is formed movably up and down, forward and backward, and left and right; and a part for storing an exchange mold is formed in a position where the clamping part is able to reach and not interfering with a bending. The center mold 5a and the exchange mold in the storing part are exchanged and attached to the movable clamp in the center part by operating the clamping part; the split mold 5b arranged on both sides of the center mold 5a is provided movably to be fixed in the left and right direction of the ram 3; the movable plate 8A of the split mold 5b is provided with an engaging member movably in the forward and backward direction of the ram 3; and the split mold 5b is moved to the left and right direction of the ram for positioning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus capable of automatically changing a mold length to a length required for bending a plate material in a press brake.

[0002]

2. Description of the Related Art In press brakes, a device for changing the length of a die provided on a ram has been proposed, for example, as Japanese Patent Publication No. 63-65408.

However, the known conventional device has the following problems. That is, when the plate material is bent by the press brake, the plate material and the mold may interfere with each other depending on the bent shape. Therefore, it is not possible to cope with all the bent shapes by one type of mold. It is possible, and as a result, mold changes are usually made.

However, in the mechanism of the known example, the shaft is provided so as to extend over a plurality of central dies and a plurality of split dies, and the shaft has a length of one die (divided dies, central dies). However, since it is considerably long, there is a problem that it is not easy to exchange the mold.

[0005]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to devise a new mechanism capable of automatically changing the length of a mold in a press brake, and to provide another shape. An object of the present invention is to provide a device that can easily and quickly perform a mold changing operation.

[0006]

The structure of the present invention made for the purpose of solving the above problems is a press blade in which a plurality of central dies and split dies are attached to a ram through clamps.
In the g., The central part of the ram and the clamps on both sides of the ram are formed as movable clamps that individually move back and forth, and a grip of a mold formed so as to be movable up and down, front and back, and left and right with respect to the movable clamps. And a holding part of a replaceable type is formed at a position where the gripping part can reach and does not interfere with the bending process, and one of the central molds of the ram, or
A plurality of exchange dies for the central die and the storage portion are exchanged and attached to the movable clamps at the central portion of the ram by operating the gripping portion, while the split dies arranged on both sides of the central die of the ram are attached to the ram. An engaging member for engaging and disengaging with the split mold is provided on a split plate moving plate which is provided so as to be movable and fixed in the left and right directions and is movable with respect to the split mold in the left and right directions of the ram. The movable plate is movably provided on the ram, and the movable plate is engaged with the split mold so as to move and position the split mold in the left-right direction of the ram.

[0007]

According to the present invention, the central mold and the split mold are mounted on the ram by the movable clamp mechanism formed so as to be automatically clamped and unclamped, and the central mold and the split mold are exchanged and the split mold is slid. Due to the structure in which the constituent members of the mechanism for transmitting the driving force to the mold are not always directly connected to the mold, that is, the driving force required only when the mold is changed or the mold length is changed is connected to the mold, The mold can now be easily replaced by simply unclamping the clamp.

Further, according to the present invention, in order to deal with the case where the length of the central mold itself attached to the ram needs to be changed according to the mold length, a plurality of replacement central storage parts for the press brake are required. Is provided so that the automatic exchange can be appropriately performed. This central mold exchange grips the central mold of the ram or storage unit to be replaced by the gripping mechanism of the mold and conveys it to the storage unit or ram,
Therefore, the mold can be detached from the gripping mechanism, and the driving force transmitting member for mold replacement is not directly connected to the mold except when the mold is replaced. It is now possible to easily attach and detach the central mold provided on the and the central mold provided on the storage part.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.
1 is a front view of a press brake equipped with an example of the device of the present invention, FIG. 2 is a side view of the press brake of FIG. 1, FIG. 3 is a plan view of the press brake of FIG. 1, and FIG. 4 is of FIG. FIG. 5 is a partially enlarged rear view of the split type clamp portion in the press brake.
4 is a sectional view taken along the line AA of FIG. 4, FIG. 6 is a sectional view taken along the line BB of FIG. 4, FIG. 7 is a rear view of the press brake of FIG. 1, and FIG.
8 is an internal side view showing an example of a mold gripping mechanism in the press brake of FIG. 9, FIG. 9 is an internal side view showing an example of an operating state of the mold gripping mechanism of FIG. 8, and FIG. 10 is a next stage of the operating state of the mechanism of FIG. It is an internal side view which shows a part.

FIG. 1 shows a press brake equipped with the device of the present invention.
An example of the key PB is shown in a front view. The press brake to which the present invention can be applied is, similarly to the known press brake, a main body frame 1, a ram 3 that can be moved up and down by drive cylinders 2 and 2 in the frame 1, and the ram 3. A lower table 4 provided on the frame 1 so as to face the ram 3 below, and an upper mold 5 mounted on the ram 3 and a lower mold 6 mounted on the table. It is configured as a main member.

In the press brake PB equipped with the device of the present invention shown in FIG. 1, the upper die 5 mounted on the ram 3 is a central die.
5a and split dies 5b arranged on both sides thereof, and a space 5c is provided between the split dies 5b on the outer side of the ram 3 and the split dies 5b on the outer ends. Left and right space 5 in this ram 3
A center mold 5a and a plurality of split molds 5b located between c and 5c are used as a mold length with a set mold length.

In the present invention, as shown in FIG. 1, a horizontal slide guide 7A is attached to the front surface of the ram 3 in the longitudinal direction, and a slide plate 8A supported and guided by the guide 7A is slidable. Installed. Here, the plate 8A has a guide 7A with the center of the ram 3 interposed therebetween.
And two plate screws 8a, 8A, each of which has a plate nut 8b, 8A screwed onto two feed screws 8a, 8a provided parallel to the ram front surface along the guide 7A. It is formed so as to be connected to 8b and to be moved in the left-right direction of the ram 3 by the rotation of the screws 8a, 8a. 8c is a drive motor for the screw 8a.

On the other hand, as shown in FIG. 5, a pin housing 9A is attached to the plate 8A so as to penetrate through the front and back thereof, and the pin housing 9A is pinned through a bush.
10A is inserted, and this pin 10A is connected so that it can be driven by the cylinder 11A. Although the pin 10A is directly connected to the cylinder 11A in FIG. 5, it can be driven via a link or the like.

To drive the split mold 5b to move left and right on the ram 3, as shown in FIG. 5, a pin 10A is inserted into the split mold driving hole 51b, and a split mold clamp 5B will be described later. After operating the hydraulic oil to unclamp it, operate the slide plate 8A in the left-right direction to
Position the split mold 5b engaged with 10A, and after positioning, set the split mold clamp 5B to the clamped state, and
Perform by removing 10A.

The split type clamp 5B is shown in FIGS. 4, 5 and 6.
Is shown in detail. The housing 52b, which forms the clamp main body of the split mold clamp 5B, has a structure in which the split mold 5b is attached to the rear surface of the ram 3 by the repulsive force of a spring 55b provided through a collar 54b to a bolt 53b which is mounted so as to penetrate the ram 3. And housing 52b
It is suspended on the ram 3 so as to be sandwiched between them.

The housing 52b for the split type clamp includes
A hole 56b for hydraulic oil passage is dug, and a cylinder portion 58b communicating with this hole 56b is provided with a piston 57b and is provided between the set pitches of the bolts 53b,
Therefore, by injecting hydraulic oil into the hole 56b with an appropriate pressure, the piston 57b expands the space between the ram 3 and the housing 52b, whereby the clamp of the housing 52b is unclamped. The split type 5b can be clamped and unclamped.

Further, the split mold 5b is pressed against the slope of the block 59b under the action of the spring 59b 'of the key block 59b by clamping the ram 3 and the housing 52b by the spring 55b acting on the housing 52b. As a result, the ram 3 is also pressed in the vertical direction, whereby the upper surface of the split mold 5b and the lower surface of the ram 3 are brought into close contact with each other.

FIG. 8 shows a press brake equipped with the device of the present invention.
A view of the interior from the side, this FIG. 8 showing the central mold 5a
Gripping part 12, central mold clamp 13, replacement central mold 5a
The storage unit 14 is shown. In FIG. 8, a bracket 13a is attached to the rear surface of the ram 3 in a direction orthogonal to the surface, a guide 13b parallel to the bracket 13a is attached to the bracket 13a, and a central type clamp is provided on the lower surface side of the guide 13b. The arm 13c for use is attached.

The arm 13c is moved back and forth by the action of the cylinder 13d so that the central mold 5a can be clamped and unclamped. The cylinder 13d is
In addition to the clamp and unclamp of the central mold 5a, it is formed so that it can be positioned at the same open position as the unclamped state of the split mold clamp 5B. Therefore, the central type 5a of the ram 3
When the clamp 13 is in the unclamped position, the central mold 5a for using the grip 12 and replacing the storage 14 is used.
Can be exchanged for.

In FIG. 8, the gripping portion 12 is mounted on the guide 12a, which is a front and rear guide 12a horizontally provided in the front and rear direction of the frame 1 on the rear side of the table 4 in the frame 1. By providing the vertical guide 12b and the left and right guides 12c mounted on the guide 12b, the horizontal plate 12d mounted so as to be movable in the front-back, up-down, and left-right directions, and the top of the plate 12d. Bracket 12e and 2-step vertical guide 12
It is formed by a die grip plate 12h attached via f and 12g.

In addition to the upper and lower guides 12d, the grip portion 12 has two
By using the upper and lower guides 12f and 12g,
A long stroke is secured in the upper and lower parts of the inside of the frame 1. Therefore, the central mold 5a of the ram 3 is gripped by the grip block 51a on the back surface being clamped by the lifted grip plate 12h and the claw block 12i driven by the cylinder 12j. .

121a is a feed screw for the front and rear guides 12a, 1
21b is a feed screw for the upper and lower guides 12b, and 121c is a pulley for the left and right direction feed belts of the plate 12d.
12d are connected. Also, in this plate 12d,
It is also possible to attach a butt for positioning the work at the time of bending the plate material, and in the case of such a configuration, it is possible to both drive the butt and carry the central die.

The gripping portion 12 which grips the central mold 5a removed from the ram 3 is moved and positioned toward the beam 14a, so that the holding block 14b projecting from the beam 14a for storing the central mold is mounted on the holding block 14b. The recess 51b 'formed in the central mold 5a can be hooked and stored. This central type 5a is a beam 14
Since the block 14b formed in the above is hooked at the recess 51b 'thereof and is only pressed from above by the plunger 14c, it can be easily attached and detached.

On the other hand, the split mold 5b is, as described above,
By unclamping the clamp 5B, the split mold 5b can be easily moved in the left-right direction on the ram 3 by the slide plate 8A, and can be pulled out from the outer end of the ram 3. With the above configuration, it is possible to easily change and move the mold to change the mold length.

FIG. 7 is a rear view of a press brake PB equipped with the device of the present invention. 8 shows an example in which the center beam 5a is stored inside the frame 1 side by side in the storage beam 14a in the left-right direction, but the storage direction is the front-back direction of the frame 1 or the vertical direction. Any of them may be used, and in such a case, the central mold 5a stored as described above can be detachably handled by changing the shape of the grip portion 12, the operating range, and the like. .

FIG. 9 shows a state in which the clamp 13 of the central die 5a is unclamped and the central die 5a is grasped by the grasping portion 12, and FIG. 10 shows a state in which the central die 5a is stored in the beam 14. It is a thing.

[0027]

The present invention is as described above,
The driving force for exchanging or moving the mold is structured so that the driving force for exchanging or moving the mold is transmitted only when the mold is replaced or moved. Since the molds are replaced and the split molds are moved and positioned, the mold length can be changed easily and quickly, and the mechanism for changing the mold length can be used for bending work and A special effect is obtained in that it does not hinder the exchange and movement of molds.

[Brief description of drawings]

FIG. 1 is a front view of a press brake equipped with an example of the device of the present invention.

FIG. 2 is a side view of the press brake of FIG.

FIG. 3 is a plan view of the press brake of FIG.

FIG. 4 is a partially enlarged rear view of the split type clamp portion in the press brake of FIG.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a cross-sectional view taken along the line BB of FIG.

FIG. 7 is a rear view of the press brake of FIG.

8 is an internal side view showing an example of a mold gripping mechanism in the press brake of FIG.

9 is an internal side view showing an example of an operating state of the die gripping mechanism of FIG.

10 is an internal side view showing the next stage of the operating state of the mechanism of FIG. 8.

[Explanation of symbols]

 1 frame 2 drive cylinder 3 ram 4 table 5 upper mold 5a central mold 5b split mold 5B split mold clamp 6 lower mold 7A slide guide 8A slide plate 9A pin housing 10A pin 11A cylinder 12 Center mold grip 13 Clamp for center mold 14 Mold compartment

Claims (1)

[Claims] 1. In a press brake in which a plurality of central dies and split dies are attached to a ram via clamps, the central portion of the ram and the clamps on both sides of the ram are formed as movable clamps that individually move back and forth. At the same time, a movable grip is provided with a mold gripping part that is movable up and down, front and back, and left and right, and a replaceable storage part is provided at a position where the gripping part can reach and does not interfere with the bending process. One of the central molds of the ram, or a plurality of the central molds and the interchangeable mold of the storage unit are formed by exchanging the movable clamps in the central part of the ram by operating the gripping unit. On the other hand, the split dies arranged on both sides of the central die of the ram are provided so as to be movable and fixed in the left and right directions of the ram, and the split die moving plate formed so as to be movable in the left and right directions of the ram with respect to the split die , The division type An engaging member that engages and disengages is provided so as to be movable in the front-rear direction of the ram, and the split mold is moved and positioned in the left-right direction of the ram by the moving plate in which the engaging member is engaged with the split mold. A press brake mold length changing device characterized in that