JPH0747425A - Press brake - Google Patents

Abstract

PURPOSE:To provide the press brake by which prevents a work from spring up at the time of bending the work, safety of a worker is secured, and also, a problem of the quality such as buckling of the work, etc., is obviated. CONSTITUTION:This press brake is constituted by providing the upper part table 27 provided with a punch 29, the lower part table 35 provided with a die 37, a frame 5 provided with the upper and the lower part tables 27, 35 so as to be movable vertically in a state that these upper and lower part tables 27, 35 are separated from each other, and a driving means 9 for turning the frame 5 by synchronizing with a bending angle at the time when bending is executed to a work W by cooperation of the punch 29 and the die 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press brake which eliminates the need for a workpiece follow-up device when bending a workpiece by the cooperation of a punch and a die.

[0002]

2. Description of the Related Art Conventionally, in bending a work by a press brake, the work is placed between a punch and a die, and either the punch or the die is lowered or raised to bend the work. Also, in a folding machine known as a folding machine, the work is put between the top die and the bottom die, and the work is pressed against it. There is.

[0003]

By the way, in the above-mentioned conventional press brake, since one of the punch and the die is lowered or raised to bend the work, the work is always flipped up. Will end up. Further, the larger the work length in the front-back direction with respect to the bending line position of the punch and die, the larger the flip-up amount becomes, and there is a safety problem for the worker, and also a quality problem such as bending of the work. Occur.

On the other hand, the bending process by the folding machine is used for the work for thin plate because of its structure, and the bending shape is considerably limited.

In order to improve the above-mentioned problems, an object of the present invention is to prevent the work from jumping up at the time of bending the work so as to ensure the safety of the worker and to prevent the work from bending and bending. It is to provide a press brake that solves the problem.

[0006]

In order to achieve the above object, the present invention provides an upper table provided with a punch, a lower table provided with a die, and an upper table provided with the upper table and the lower table separated from each other. A press provided with a frame in which a lower table is movable up and down, and a drive means for rotating the frame in synchronization with a bending angle when a work is bent by cooperation of the punch and the die. Configured the brake.

In the press brake, it is desirable that a rotation center for rotating the frame is provided on a work pass line.

[0008]

By employing the press brake of the present invention, the work is placed between the punch and the die, and one of the punch and the die is lowered or raised to bend the work.

During the bending process of this work, that is, by the driving means, the frame provided with the upper table having the punch and the lower table having the die is rotated in synchronization with the bending angle. The work piece is prevented from jumping up and is bent.

Therefore, the safety of the worker is ensured, and the problem of quality such as bending of the work is solved.

[0011]

Embodiments of the present invention will be described in detail below with reference to the drawings.

Referring to FIGS. 1 and 2, as the press brake 1, pedestals 3R and 3L are erected on the floor surface so as to be separated from each other in the left-right direction. A rotatable frame 5 is provided between the cradle 3R and 3L. The frame 5 includes left and right side frames 5R and 5L and upper and lower frames formed by connecting the side frames 5R and 5L. It is composed of 5U and 5D. A rotary shaft 7 extending in the left-right direction is formed substantially at the center of the side frames 5R, 5L in the up-down direction, that is, substantially the pass line of the work.
R and 7L are mounted, and the left and right of the rotations 7R and 7L are rotatably supported on the upper portions of the receiving bases 3R and 3L.

A drive motor 11 forming a part of the drive means 9 is mounted on the floor surface on the left side of the cradle 3L. The drive motor 11 is provided with an encoder 13. A drive pulley 17 is fitted on the output shaft 15 of the drive motor 11. On the other hand, the rotary shaft 7L supported by the receiving base 3L projects from the left end, and a driven pulley 19 is fitted to the rotary shaft 7L. A belt 21 is wound around the driven pulley 19 and the drive pulley 15.

With the above structure, when the drive motor 11 is driven, the drive pulley 17 is rotated via the output shaft 15. This rotation is caused by rotating the rotating shafts 7L and 7R via the belt 21 and the driven pulley 19 so that the frame 5
Is rotated clockwise or counterclockwise in FIG. The rotation angle of the frame 5 is detected by the encoder 13 and controlled by a controller (not shown).

Hydraulic cylinders 23R and 23L as a pressurizing mechanism are provided above the side frames 5R and 5L. An upper table 27 is attached to the lower end of the piston rod 25 attached to the hydraulic cylinders 23R and 23L. A punch 29 is provided below the upper table 27.

On the other hand, hydraulic cylinders 31R and 31L as a pressurizing mechanism are provided below the side frames 5R and 5L. At the upper end of the piston rod 33 mounted on the hydraulic cylinders 31R and 31L, the lower table 3 is attached.
5 is attached. A V-shaped die 37 is provided above the lower table 35.

With the above configuration, for example, the hydraulic cylinder 31
By actuating R and 31L and slightly raising the lower table 35 via the piston rod 33, the die 37 is positioned on the pass line of the work.

With the work placed on the die 37, the hydraulic cylinders 23R, 23L are operated to lower the upper table 27 via the piston rod 25, whereby the tip of the punch 29 is brought into contact with the work on the die 37. It is pressed. Then, the lower table 35 is lifted to pressurize the work to bend the work, and the die 37 is lifted to the original position, whereby a series of bending is performed.

Although not shown in FIGS. 1 and 2, a known work is positioned behind the press brake 1 as shown in FIGS. 3 (A) and 4 (A). A positioning stopper 39 is provided so as to be movable in the front-rear direction. Further, as shown in FIG. 5 (A), an unloading chain block 41 that has been moved to the rear of the press brake 1 or a push-up auxiliary cylinder 43 is provided in the lower table 35. .

Next, along with the repair work of rivers, L-shaped concrete blocks such as large U-shaped grooves and levees have been used. It is necessary to bend the reinforcing bar contained in this concrete block into an L shape or a U shape.

Therefore, the operation when the press brake 1 of this embodiment is used to bend the work W of the reinforcing bar into, for example, a U shape will be described.

First, as shown in FIG.
The positioning stopper 39 is moved forward (moved to the right in FIG. 3A) to be set at the bending position. Rebar work W
And the end surface of the work W is positioned by the positioning stopper 39.
Hit against. Then, the punch 29 is lowered and the work W is pressed by the tip of the punch 39. Die 3
7 is lifted and made to stand by once at the pass line height position of the work W.

As shown in FIG. 3B, the die 3
7 is raised to start the bending operation. Since the work W is flipped up as the die 37 is raised, the frame 5, that is, the upper and lower tables 27, 35 is rotated right in FIG. 3B by the amount of the work W flipped up. The upper and lower tables 27 and 35 are rotated to the right according to the rise of the die 37 until the work W is bent at 90 degrees.
With the work W bent at 90 degrees, the upper and lower tables 27 and 35 are completely rotated by 45 degrees. The L-shaped bending is completed by this point. The die 37 descends, and the upper and lower tables 2
7, 35 rotate left 45 degrees, and the punch 29 and the die 37 are returned in the vertical direction.

As shown in FIG. 4A, the die 3
7 is moved up and is made to stand by at the pass line height position of the work W, the positioning stopper 39 is moved forward (see FIG. 4).
(To the right in (A)), complete the setting at the U-shaped bending position. The L-shaped bent work W is fed and the L-shaped portion of the work W is abutted against the positioning stopper 39 to complete the positioning. Next, the punch 29 is lowered and the work W is pressed by the tip of the punch 29. The positioning stopper 39 is retracted to complete the escape.

As shown in FIG. 4B, the die 3
7 is raised to start the bending operation. Since the work W is flipped up as the die 37 rises, the frame 5, that is, the upper and lower tables 27, 35 is rotated counterclockwise in FIG. 4B by the amount of the work W flipped up. The upper and lower tables 27 and 35 are rotated counterclockwise according to the rise of the die 37 until the work W is bent 90 degrees.
When the work W is bent 90 degrees, the upper and lower tables 27, 35 are completely rotated by 45 degrees, and the work W is bent in a U shape.

As shown in FIG. 5A, the die 3
The upper and lower tables 27 and 35 are rotated to the right while 7 is raised. Using the carry-out chain block 41, a wire is applied to the work W of the lattice reinforcing bars and the work is pulled up while preventing falling. Depending on the case, the lifting work is performed while preventing the fall by the push-up auxiliary air cylinder 43 provided in the lower table 35. At this time, the punch 29 and the die 37 are returned to the vertical position, the die 37 is lowered, and the work is completed.

As shown in FIG. 5 (B), after the punch 29 is raised, the work W bent in a U-shape is carried out rearward (to the left in FIG. 5 (B)) and then the lower part. The unloading work from the table 35 is completed.

As described above, while the work W is being bent by the cooperation of the punch 29 and the die 37, that is, when the work W is bent by raising the die 37, the frame 5 is bent.
It is possible to prevent the work W from being flipped up by synchronously rotating the upper and lower tables 27 and 35 provided in the. Thus, it is possible to ensure the safety of the worker and solve the quality problem such as the bending of the work W.

As shown in FIG. 6, when the centers of rotation of the upper and lower tables 27 and 35 are positioned below the pass line of the work W, the work W moves to the right in accordance with the bending and turning motions. It will move, resulting in poor bending accuracy and scratches. Further, since the stroke amount of the hydraulic cylinders 31R, 31L of the die 37 becomes large and the cost increases, as in the above-described embodiment,
The center of rotation of the lower tables 27, 35 is preferably located on the pass line of the work W.

Further, the flip-up of the work W and the control of the rotation angle are controlled by a numerical calculation control method using a computer,
When a proximity switch or the like is embedded in the upper and lower tables 27 and 35 and flipped up to detect OFF, the table is rotated. A control method in which this is repeated may be used. By changing the shape of the punch 29, sheet metal panel processing etc. The shape of W is a bar or plate. Even if there is a band, it is possible.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes. In this embodiment, the die 37
In the example described above, the work W is bent by raising the stroke W to bend the work W, but the work W may be bent by lowering the punch 29 by the stroke. Further, although the bending angle of the work has been described as an example of 90 degrees, other angles may be used.

[0032]

As can be understood from the above description of the embodiments, according to the present invention, since the structure is as described in the claims, the work when bending the work It is possible to prevent the work from jumping up by rotating the frame provided with the upper and lower tables in synchronization with the bending angle of. Thus, it is possible to secure the safety of the worker and solve the quality problem such as the bending of the work.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a press brake of the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is an operation explanatory view of bending a work by the press brake of the present invention.

FIG. 4 is an operation explanatory view of bending a work by the press brake of the present invention.

FIG. 5 is an explanatory view of the operation of bending the work by the press brake of the present invention.

FIG. 6 is an explanatory view illustrating a position of a rotation center for rotating a frame provided with upper and lower tables.

[Explanation of symbols]

 1 Press Brake 3R, 3L Cradle 5 Frame 7 Rotating Shaft 9 Drive Means 11 Drive Motor 13 Encoder 23R, 23L Hydraulic Cylinder 27 Upper Table 29 Punches 31R, 31L Hydraulic Cylinder 35 Lower Table 37 Die

Claims (2)

[Claims] 1. An upper table having a punch, a lower table having a die, a frame in which the upper and lower tables are vertically movable with the upper and lower tables separated from each other, and the punch and the die. And a drive means for rotating the frame in synchronism with a bending angle when a work is bent in cooperation with the press brake. 2. The press brake according to claim 1, wherein a rotation center for rotating the frame is provided on a path line of the work.