JP2818439B2 - Forward and reverse bending device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a forward / reverse bending device for a press brake.

(Prior Art) Conventionally, there has been known a press brake that bends a work by cooperation of an upper die and a lower die. The press brake is provided with a die changing device for performing forward bending and reverse bending on a work.

This mold exchanging device automatically exchanges a mold for forward / reverse bending by a pantograph driven by a chain or an air cylinder, for example.

(Problems to be Solved by the Invention) Incidentally, the mold exchanging device itself for automatically exchanging the mold for forward / reverse bending is large-scale, and has a drawback that the bending return bend is deteriorated. Further, in the case of the above-mentioned mold exchanging apparatus, there is a problem that it is very difficult to cope with a standard machine due to the restriction of the stroke length of the press brake body.

An object of the present invention is to provide a forward / reverse bending mold between an upper mold and a lower mold, and to forward-bend the work without exchanging the upper mold and the lower mold and without changing the work. An object of the present invention is to provide a forward / reverse bending device for a press brake capable of performing reverse bending.

[Constitution of the Invention] (Means for Solving the Problems) In view of the conventional problems as described above, the present invention provides a structure in which a forward / reverse die is provided between an upper die and a lower die. And a forward / reverse bending apparatus configured to bend a workpiece between the lower die and the forward / reverse die, and between the lower die and the forward / reverse die, supporting both ends of the forward / reverse die. A first state in which a forward / reverse die is engaged with the upper die and a work can be arranged between the forward / reverse die and the lower die, and a forward / reverse die is engaged with the lower die. And a fluid pressure cylinder capable of automatically moving the forward / reverse die up and down in a second state in which a work can be arranged between the forward / reverse die and the upper die.

(Example) An example of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 6, the press brake 1 has C-shaped side frames 3R and 3L, and has an upper frame 5 and a lower frame 7 supported on upper and lower portions of the side frames 3R and 3L. ing.

At the lower part of the upper frame 5, a regular punch 11 as an upper die is mounted via an appropriate number of support devices 9. On the upper part of the lower frame 7, a reverse punch 13 as a lower die for bending the work W corresponding to the main punch 11 is mounted via a reverse punch holder 15 with a plurality of bolts 17 or the like.

In the press brake 1 having the above-described configuration, an appropriate one of the upper frame 5 and the lower frame 7 is raised and lowered by an appropriate lifting drive device, and the work W is bent by cooperation of the upper die and the lower die. It will be.

As the lifting drive, for example, side frames 3R, 3L
Hydraulic cylinders 19R and 19L are provided on the upper part of the upper frame 5, and the upper frame 5 is moved up and down by the operation of the hydraulic cylinders 19R and 19L to bend the workpiece W.

A forward / reverse die 21 as a forward / backward bending die is exchangeably provided above the reverse punch 13. More specifically, as shown in FIGS. 1 and 2, guide pins 23L (23R) extending vertically are mounted on both left and right ends of the lower table 7. This guide pin 23L (23
R) to guide member 2 via linear bush 25L (25R)
7L (27R) is mounted slidably in the vertical direction.

A disc-shaped cover member 29L (29R) is attached to an upper portion of an end of the guide member 27L (27R) with a plurality of bolts 31 or the like.

A fluid pressure cylinder 33L (33R) is fixed inside the lower frame 7 to which the guide pins 23L (23R) are attached. The distal end of the piston rod 35L (35R) of the fluid pressure cylinder 33L (33R) is mounted below the guide member 27L (27R).

Both ends of the forward / reverse die 21 provided above the reverse punch 13 are mounted in notch grooves 37R, 37L formed at the inner ends of the guide members 27R, 27L, and the forward / reverse die exchange is performed. Stopped by pins 29R and 39L.

With the above configuration, by operating the fluid pressure cylinders 33R, 33L, the guide members 27R, 27L are guided by the guide pins 23R, 23L via the piston rods 35R, 35L, and from the position shown by the solid line in FIG. It will be raised to the position indicated by the two-dot chain line. Moreover, the forward / reverse die 21 is a guide member 27
Since the forward and reverse die exchange pins 39R and 39L are fixed to R and 27L, the guide members 27R and 27L are raised together with the guide members 27R and 27L to the position indicated by the two-dot chain line.

The forward / reverse die 21 can be removed upward by pulling the forward / reverse die exchange pins 39R, 39L from the guide members 27R, 27L, so that the forward / reverse die 21 can be easily replaced.

The reverse punch 13 can be mounted irrespective of its shape, and replacement and removal of the reverse punch 13 is performed by attaching and removing a bolt 17 to and from the reverse punch holder 15. At this time, the centering of the mold is performed by the automatic centering method, and the forward / reverse die 21 is pressed by the forward punch 11 so that the reverse punch 13
21 and the core match. After that, fixing is performed by the bolt 17.

When performing forward bending on the work W, the forward / reverse die 21 is provided on the reverse punch 13. That is, the state shown in FIG. 3 is obtained by not operating the fluid pressure cylinders 33R and 33L in FIG. In the state shown in FIG. 3, for example, by lowering the normal punch 11, the work W is bent forward in cooperation with the normal punch 11 and the normal / reverse die 21.

In the case of performing reverse bending on the work W, the hydraulic cylinders 33R and 33L are operated in FIG.
By ascending to the position shown by the dashed line, it comes into contact with the lower part of the main punch 11, as shown in FIG.

In the state shown in FIG. 4, for example, by lowering the forward punch 11, the work W is reversely bent by cooperation of the reverse punch 13 and the forward / reverse punch 21.

In addition, if the above-described forward bending and reverse bending are alternately performed at both ends of the work, a box-shaped bent product G as shown in FIG. 5 can be obtained without changing the work W.

In this way, by providing the forward / reverse die 21 above the reverse punch 13 or below the forward punch 11, it is possible to perform forward and reverse bending on the work W without changing the work W. Also, when performing forward bending and reverse bending,
Reduction of man-hours for mold replacement and setup work and reduction of material handling work make it possible to streamline bending work.
Further, forward bending and reverse bending can be performed in series without sacrificing the return bend area of bending.

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

[Effects of the Invention] As can be understood from the above description of the embodiments,
In short, the present invention provides a forward / reverse die (21) between the upper die (11) and the lower die (13), so that the upper die (11) and the forward / reverse die (21) A forward / reverse bending apparatus configured to perform a bending process on a work (W) between the lower die (13) and the forward / reverse die (21). Supporting both ends, the forward / reverse die (21) is engaged with the upper die (11), and the work (W) is arranged between the forward / reverse die (21) and the lower die (13). The first possible state and the forward / reverse die (21) are engaged with the lower die (13) to move the work (W) between the forward / reverse die (21) and the upper die (11). The forward / reverse die (21) is placed in the second position where it can be placed.
Is provided with a fluid pressure cylinder which can be automatically moved up and down.

As is clear from the above configuration, in the present invention, the forward / reverse die 21 disposed between the upper die 11 and the lower die 13 is provided with a fluid pressure cylinder capable of automatically moving up and down, and the upper die The first state in which the workpiece W can be arranged between the forward / reverse die 21 and the lower die 13 by engaging the forward / reverse die 21 with the first die 11 and the forward / reverse die 21 is engaged with the lower die 13. Thus, since the configuration is such that the work W can be automatically switched to the second state in which the work W can be arranged between the forward / reverse die 21 and the upper die 11, for example, forward bending and reverse bending are alternately repeated. In the returned bending process, the bending process can be performed efficiently.

[Brief description of the drawings]

1 and 2 show a main part according to the present invention. FIG. 1 is an enlarged detailed view of a part viewed from an arrow I in FIG. 6, FIG. 2 is a plan view in FIG. 1, FIG. FIG. 4 is an explanatory side view showing forward and reverse bending of this embodiment, FIG. 5 is an example of a forward and reverse bent product of this embodiment, and FIG. 6 is an embodiment of the present invention. It is a schematic front view of a press brake. 1 Press brake 7 Lower frame 11 Forward punch (upper die) 13 Reverse punch (lower die) 21 Forward / reverse die (forward / reverse bending die) 23R, 23L Guide Pin 27R, 27L …… Guide member 33R, 33L …… Fluid pressure cylinder 39R, 39L …… Die exchange pin for forward / reverse

Claims (1)

(57) [Claims] 1. A forward / reverse die (21) is provided between an upper die (11) and a lower die (13), and the upper die (11) and the forward / reverse die (21) are connected to each other. A forward / reverse bending apparatus configured to perform a bending process on a work (W) between the lower die (13) and the forward / reverse die (21). Supporting both ends, the forward / reverse die (21) is engaged with the upper die (11), and the work (W) is arranged between the forward / reverse die (21) and the lower die (13). The first possible state and the forward / reverse die (21) are engaged with the lower die (13) to move the work (W) between the forward / reverse die (21) and the upper die (11). The forward / reverse die (21) is placed in the second position where it can be placed.
A forward / backward bending apparatus characterized by being provided with a hydraulic cylinder capable of automatically moving up and down.