JPH0771697B2 - Press brake mold changer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a mold exchanging device for a press brake, and more specifically, a first upper mold and a mold provided on an upper table of the press brake. The present invention relates to a mold exchanging device that is easily aligned with a second upper mold provided in the exchanging device.

[Prior Art] Conventionally, as a die exchanging device for an upper die in a press brake, for example, JP-A-53-109858 (hereinafter simply referred to as "prior example 1") and U.S. Pat. No. 3681994 (hereinafter simply referred to as "prior example") 2) and so on.

[Problems to be Solved by the Invention] However, in the above-described first example, a mold exchanging device is provided for the first upper mold preliminarily attached to the lower part of the upper table in the press brake. Since the second upper mold provided is crimped to the side surface, the cylinder must always be operated so as not to separate the second upper mold from the first upper mold. When the shape of the first upper mold is changed by attaching and detaching the upper mold,
There is a problem that it may be difficult to crimp the upper mold to the first upper mold and it may become unusable.

Further, in the configuration of the second example, the core of the first upper mold preliminarily mounted on the upper table of the press brake and the core of the second upper mold provided in the mold exchanging device are arranged in the front and rear directions. There is a problem in that the position is displaced, and for example, when a back gauge is used, position correction is necessary and the operation becomes difficult.

[Means for Solving the Problems] In view of the conventional problems as described above, the present invention provides a first part provided on a lower portion of the upper table on at least one of a front side and a rear side of the upper table in the press brake. A mold exchanging device supporting an engageable second upper mold is provided below the upper mold, and the mold exchanging device is arranged in the front-rear direction with respect to the first upper mold. So that the cores are aligned and the second upper mold is positioned below the first upper mold, the second upper mold is lifted to the lower side of the first upper mold. A first mold for aligning a second upper mold is provided, and the mold matching mechanism is supported by a support member attached to the upper table and always moves the vertical link up and down. The parallel link mechanism and the vertical link are provided as a common link, and the second link A second parallel link mechanism that always holds a link supporting an upper die vertically and vertically so that the first link is provided via the common link.
The parallel link mechanism is fixed so that the second parallel link mechanism can be operated, and the second parallel link mechanism and the first parallel link mechanism are interlocked in the vertical direction. It is provided with a link actuating device for actuating.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to the drawings.

Referring to FIG. 1, a lower table 7 which is vertically moved by a hydraulic cylinder 5 is provided below a frame 3 of the press brake 1. A lower die 7 which is a lower die is fixed to an upper portion of the lower table 7 through a die holder 9 which is a lower die holder.

On the other hand, at the lower end of the upper table 13 fixed to the upper part of the frame 3, a punch 17 as an upper die is fixed via a punch holder 15 as an upper die holder. The plate-shaped work W is bent between the punch 17 and the die 11.

In the upper part of the front side (left side in FIG. 1) of the upper table 13 in the press brake 1, a punch as an upper die is provided.
A mold exchanging device 19 for exchanging 17 is attached.

In order to align the second upper mold 11K provided in the mold exchanging device 19 with the lower side of the punch 17 so that there is no displacement in the front-rear direction, the mold exchanging device 19 has a mold aligning mechanism. Is equipped with.

That is, referring to FIGS. 2A and 2B, the mold exchanging device 19 is attached to the upper front portion of the upper table 13 via a bracket 21 which is a supporting member. Rotating shafts 23 and 25 are attached to the upper side of the bracket 21 with a certain interval. The rotary shafts 23 and 25 are provided with lower portions of a first air cylinder 27 and a second air cylinder 29, respectively, in a substantially vertical direction.

Therefore, each of the first air cylinder 27 and the second air cylinder 29 can be slightly swung with respect to the bracket 21. The tip portion 31T of the piston rod 31 of the first cylinder 27 is fixed to one end of the first link 33 by a pin 35 so that it can be slightly rotated.

On the other hand, the tip portion of the piston rod 37 of the second air cylinder 29 is fixed to the substantially central portion of the second link 39 with a pin 41. One end of the second link 39 has a pin 43 on the bracket 21.
It's stopped at. The other end of the second link 39 is fixed to one end of a vertical third link 45 by a pin 47. Substantially the central portion of the third link 45, approximately the central portion of the first link 33, and the second link 39
The one end of the fourth link 49 parallel to is fixed by a pin 51.

The other end of the fourth link 49 is fixed to the bracket 21 by a pin 53 at a position vertically below the pin 43. Third link
The other end of 45 is fixed to one end of the fifth link 55 by a pin 57. The other end of the first link 33 and the upper end of the sixth link 59 perpendicular to the first link 33 are fixed by a pin 61. Furthermore, the fifth link 55,
5th link so that it can be installed almost parallel to the 1st link 33
The other end of 55 is fixed to the sixth link 59 by a pin 63. A screw 65 is provided upward at one end of the fifth link 55.

As is clear from the above description and the illustrations in FIGS. 2A and 2B, the first link 33 and the fifth link 55 are configured as a first parallel link mechanism that always maintains parallelism, and This is a configuration of a second parallel link mechanism in which the second link 39 and the fourth link 49 are always maintained in parallel. Further, the third link 45 and the sixth link 59 are configured to always maintain the vertical.

That is, the first link 33 to the sixth link 59 have a structure in which two parallel link mechanisms are combined with the vertical third link 45 as a common link, and the two parallel link mechanisms function as link actuating devices. Of the first air cylinder 27
It is configured so that it can be operated in conjunction with the vertical direction.

A roller 67 is attached to a part of the lower portion of the upper table 13. An upper die holder 69 for exchanging the upper die is provided at the lower end of the sixth link 59.
A second upper mold 11K for replacing the upper mold is attached.

With the above configuration, the operation of the mold exchanging device 19 will be described.
The mold exchanging device 19 operates as shown in FIGS. 2 (A) to 2 (B). That is, when the first air cylinder 27 operates and the piston rod 31 thereof descends, each of the first to sixth air cylinders is resisted against the second air cylinder 29 which is used as a substitute for the balance spring. The link will descend due to its own weight, but first, the second link 39 and the fourth link 49 will be the second link with the pins 43 and 53 as fulcrums, respectively.
In the figure (A), it rotates counterclockwise.

At this time, the first link 33 and the fifth link 55 have a sixth link
Since the weight of 59, the second upper mold 11K and the like is acting, the screw 65 descends while being in contact with the first link 33. Next, when the sixth link 59 comes into contact with the roller 67 attached to the upper table 13, the downward rotation of the second link 39 and the fourth link 49 is stopped.

Thus, when the sixth link 59 contacts the roller 67, the second upper mold 11K attached to the lower portion of the sixth link 59 is positioned below the punch 17.

When the piston rod 31 of the air cylinder 27 is further lowered in this state, the first link 33 and the fifth link 55 start to rotate in the counterclockwise direction and the sixth link 59 is vertically lifted. A second upper mold 11K is held on the lower end of the punch 17 attached to the lower surface of the holder 15 in a state where the second upper mold 11K is closely and vertically stacked with the core having no positional deviation in the front-rear direction aligned. The mold exchange is completed.

As will be appreciated, the roller 67 has a sixth
After the link 59 abuts, the sixth link 59 holds the vertical position and is lifted vertically. By the lifting of the sixth link 59, the second upper die 11K moves to the position shown in FIG. 2), the punch 17 is brought into close contact with the lower side of the punch 17 in a state in which a core having no positional displacement in the front and rear is fitted (a state having no positional displacement in the left-right direction in FIG. 2).

Therefore, when the sixth link 59 comes into contact with the roller 67 as described above, the front-rear center of the second upper mold 11K is already aligned with the front-rear center of the punch 17.

In the state where the mold exchanging device 19 is shown in FIG. 2 (B), when the piston rod 31 of the first air cylinder 27 is contracted and moved upward, the self-weight of the sixth link 59, the second upper mold 11K, etc. As a result, first, the first link 33 and the fifth link 55 rotate clockwise with the pins 51 and 57 as fulcrums, respectively, and the second upper die 11K descends so as to separate from the punch 17.

Then, when the first link 33 comes into contact with the screw 65 provided on the fifth link 55, the rotation of the first and fifth links 33, 55 is restricted. Therefore, the piston rod 31 is lifted to lift the first and fifth links 33, 55, and the second link 39 and the fourth link 49 are rotated clockwise about the pins 43, 53 as fulcrums. Then, as shown in FIG. 2 (A), the original state is restored.

Although the mold exchanging device 19 has been described as being attached to the front side of the upper table 13, the mold exchanging device 19 may be provided only on the rear side of the upper table 13 or on the front side and the rear side of the front and rear. May be attached.

[Effect] As will be understood from the above description of the embodiment, according to the present invention, the die is different from the first upper die 17 preliminarily attached to the lower portion of the upper table 13 in the press brake. The second upper mold 11K provided in the exchanging device 19 is once positioned below the first upper mold 17 so that there is no displacement in the front-rear direction, and the cores in the front-rear direction are aligned with each other. Since the second upper mold 11K is aligned and closely attached to the lower portion of the first upper mold 17, it is possible that the outer shape and the dimensions of the first upper mold 17 may be slightly changed due to the attachment / detachment of the first upper mold 17, for example. Even in such a case, it can be easily dealt with. Further, since the first and second upper molds are closely fitted to each other with their cores aligned without being displaced in the front-rear direction, the machining position does not change in the front-rear direction.
In addition, a moment in the front-rear direction does not act on the second upper mold during processing, and stable processing can be performed.

Further, in the present invention, since the posture of the second upper mold 11K is always kept vertical, the centering in the front-rear direction with respect to the first upper mold 17 is performed by the second upper mold. It can be easily performed without considering the attitude of the mold 11K.

The present invention is not limited to the above-mentioned embodiment,
The present invention can be implemented in other modes by making appropriate changes.

[Brief description of drawings]

FIG. 1 is a side sectional view of a press brake which is an example of a folding machine equipped with the mold exchanging device of the present invention. 2 (A) and 2 (B) are enlarged views taken in the direction of the arrow II in FIG. 1, FIG. 2 (A) is a state diagram before the mold replacement, and FIG. 2 (B) is the mold replacement. FIG. [Explanation of symbols showing main parts of drawing] 1 ... press brake, 13 ... upper table, 17 ... punch, 19 ... die changing device, 27 ... air cylinder, 33 ...
… First link, 39 …… Second link, 45 …… Third link,
49 …… 4th link, 55 …… 5th link, 59 …… 6th link, 67 …… Laura

Claims (1)

[Claims] 1. An upper table (1) in a press brake.
A second upper mold (11K) which is engageable with the lower side of the first upper mold (17) provided in the lower part of the upper table (13) on at least one side of the front side or the rear side of 3). The mold exchanging device (19) supporting the above is installed, and the mold exchanging device (19) is provided.
Aligns the core with the first upper mold (17) so that there is no displacement in the front-rear direction, and places the second upper mold (11K) below the first upper mold (17). A mold alignment mechanism for aligning the second upper mold (11K) with the lower side of the first upper mold (17) by raising the second upper mold (11K) after positioning The mold matching mechanism is a first parallel link mechanism (39, 49) which is supported by a support member (21) attached to the upper table (13) and vertically moves a vertical link (45). A second parallel link mechanism (33, 33), which has the above-mentioned vertical link (45) as a common link, and always holds the link (59) supporting the second upper mold (11K) so as to be vertically and vertically movable. 55) and the operation of the second parallel link mechanism (33, 55) with the first parallel link mechanism (39, 49) fixed via the common link. And a link actuating device (27) for actuating the second parallel link mechanism and the first parallel link mechanism in an up-and-down direction in conjunction with each other. Press brake mold changing device.