JP3464978B2 - Press brake - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a press brake.

[0002]

2. Description of the Related Art When a plate-shaped work is bent by a press brake, a uniform pressure is applied over the entire length of the bent part of the work.
16804 (hereinafter referred to as Prior Art 1), Japanese Patent Publication Sho 59
No. 2569 (hereinafter referred to as the prior art 2).
Further, as a precedent example of a die device having a function of adjusting a bending angle of a work, there is, for example, Japanese Patent Publication No. Sho 64-9891 (referred to as Prior Art Example 3).

[0003]

In the above-mentioned prior art examples 1 and 2, the uniform bending can be performed over the entire length of the bent portion of the work, but the bending angle of the work is adjusted.
It is necessary to adjust the vertical position of one of the upper and lower tables on the movable side in order to adjust the engagement state between the upper mold and the lower mold, and it is difficult to process the bending angle with high accuracy. There is a problem that is.

In the prior art example 3, the depth piece for restricting the position of the bottom of the work with respect to the die is vertically adjustable, but the vertical adjustment of the depth piece is performed before starting the bending of the work. However, the vertical position of the depth piece cannot be adjusted during bending. Further, the vertical position of the depth piece cannot be automatically adjusted.

[0005]

The present invention SUMMARY OF THE INVENTION has been made in view of such prior art problems described above, a plurality invention, mounted vertically movably on the lower table in a press brake according to claim 1 Bending dies each having a bending groove are provided on the supporting member of, and a depth piece for regulating the position of the bottom of the work to be bent is provided in each of the bending grooves so that the vertical position can be adjusted relatively. , The relative vertical position of each of the depth pieces under the control of the control device.
At the same time, an actuator for automatically adjusting is provided.

According to a second aspect of the present invention, in the press brake according to the first aspect, each of the supporting members is mounted on a lower table so as to be movable up and down through each fluid pressure device, and each of the fluids described above. The fluid pressure in the pressure device is individually adjustable.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, in order to facilitate understanding, the overall structure of a press brake will be schematically described.

As shown in FIG. 5, the press brake 1 is provided with an upper table 5 on the upper side of the left and right side frames 3 and a lower table 7 on the lower side thereof. A die device (punch) 9 is attached, and a lower die device (die) for bending the plate-shaped work W is provided on the upper part of the lower table 7 in cooperation with the punch 9.
11 is attached.

In the press brake 1 having the above-mentioned structure, one of the upper table 5 and the lower table 7 is constituted by a movable table which can be moved up and down, and by a proper driving device (not shown) such as a hydraulic cylinder or a ball screw mechanism. The movable table is vertically moved.

Then, the movable table (for example, the lower table 7) is moved up and down by the driving device, and the punch 9 and the die 11 are engaged with each other, whereby the work W is bent.

1 to 3, the lower die device (die) 11 is provided with a base plate 13 which is detachably attached to the upper part of the lower table 7. The base plate 13 is long in the left-right direction, and a plurality of fluid pressure devices, which are cylinders 15 are arranged close to each other in the longitudinal direction (left-right direction) of the base plate 13, on the base plate 13.

A piston 17 is provided in each cylinder 15.
Is vertically movably fitted, and a ring-shaped retainer 25 and a depth base 27 as a supporting member are integrally attached to each piston rod 21 extending upward from the piston 17 via a bolt 23. is there.

The depth base 27 has a thin T-shaped plate portion 2 on an upper portion of a cylindrical portion 27C on the lower side.
7P is integrally provided. A mold base 29 is relatively movably fitted to the outer periphery of the cylindrical portion 27C of the depth base 27.

A male screw portion 29 is provided below the mold base 29.
An S is formed, and a nut member 31 rotatably supported by the retainer 25 is screwed into the male screw portion 29S. The outer peripheral surface of the nut member 31 is a pinion 31.
The rack 33 is formed on the pinion P and is engaged with the pinion 31P so as to be movable in the left-right direction.

In order to movably support the rack 33 in the left-right direction, a rack guide 35 extending in the left-right direction is integrally attached to each cylinder 15 by bolts or the like. The rack 3
A guide groove 35G for guiding the guide 3 in the left-right direction is formed, and backup rollers 37 are rotatably mounted at a plurality of positions via a shaft 39.

In order to move the rack 33 in the left-right direction, a motor 41 is attached to one end of the rack guide 35 as an actuator which is driven under the control of a control device. Is the rack 3
A pinion 43 screwed to 3 is attached.

With the above structure, by controlling the rotation of the motor 41, the rack 33 is moved in the left-right direction via the pinion 43, and the nut members 31 screwed into the rack 33 are simultaneously rotated in the forward and reverse directions. Become.

When each nut member 31 is rotated as described above, each die base 29 screwed into each nut member 31 is adjusted up and down with respect to each tapes base 27.

[0019] That is, according to this embodiment, for example, by controlling the motor 41 by a control device such as a numerical controller, each mold base 29 for each Deipusubesu 27
The upper and lower positions of can be automatically adjusted at the same time .

A bending die 45 having a bending groove 45G extending in the left-right direction is integrally provided on the die base 29. A plurality of T's are provided in the bending groove 45G of the bending die 45.
A letter-shaped depth piece 47 is arranged so as to be vertically movable, and the lower end portion of each depth piece 47 is supported by abutting against a plate portion 27P of the depth base 27.

In the above construction, since the bending angle of the work W is so-called three-point bending, the bending die 45
It is set by the groove width of the bending groove 45G and the relative lowering position of the depth piece 47 with respect to the upper surface of the bending die 45.

Therefore, in order to bend the work W, the relative lowering position of the depth piece 47 with respect to the upper surface of the bending die 45 is set in consideration of the thickness of the work W, the bending angle, the spring back, etc. The rotation of the motor 41 is controlled and automatically set. That is, by controlling the motor 41 to move the rack 33 in the left-right direction in FIG. 1, the mold base 29 moves up and down corresponding to the movement amount of the rack 33 as described above, and the depth piece 47 with respect to the upper surface of the bending mold 45 is moved. The relative lowering position of the can be automatically adjusted.

Next, the movable table of the press brake is moved up and down to raise the lower table 7 in this embodiment to bring the distance between the punch 9 and the die 11 close to the desired distance.

When the punch 9 and the die 1 are close to the desired distance as described above, the working fluid is supplied to each cylinder 15 in the die 11 to simultaneously raise the pistons 17 in the lowered state. . Each piston 17
When each of the bending dies 4 is lifted,
Since the punch 9 engages with the bending groove 45G of No. 5, the work W previously placed on each bending die 45 is bent by the cooperation of the punch 9 and the bending die 45.

At this time, the work W on the bending die 45 is pushed into the bending groove 45G by the punch 9 and abuts on the depth piece 47 in the bending groove 45G, whereby the position of the bottom of the work W is regulated. Will be.

Therefore, the bending groove 4 in the bending die 45
The bending angle of the work W is determined by a triangle defined by three points, that is, two points on the edge of 5G and one point on the upper surface of the depth piece 47.

When the work W is bent as described above, an equal pressure is applied from each pressure source in each cylinder 15, so that the work W is equally bent over the entire length of the bent portion. It is something under pressure.

As described above, when the work W is bent by the engagement between the punch 9 and the die 11, the bending angle of the work W is measured by an appropriate angle measuring device. When it is necessary to further bend the cylinder at an acute angle, the pressure in each cylinder 15 is adjusted to reduce the pressure.

The above-mentioned pressure reduction in each cylinder 15 is such that the nut member 31 can be rotated, and does not release the holding of the work W by the punch 9 and the die 11.

When the pressure in each cylinder 15 is reduced and the surface pressure of the portion where the nut member 31 and the male screw portion 29S of the mold base 29 are screwed is reduced to allow the nut member 31 to rotate, the motor 41 is turned on. When the rack 33 is operated to move in the left-right direction in FIG. 1, the die base 29 is raised relative to the depth base 27, and thus the depth piece 47 is lowered relative to the upper surface of the bending die. It will be.

Therefore, after automatically adjusting the relative lowering position of the depth piece 47 with respect to the upper surface of the bending die 45 as described above, each cylinder 15 as a fluid pressure device.
By increasing the internal pressure again, the work W can be additionally bent, and the work W can be bent accurately.

By the way, in the above description, the pressure is evenly applied to each cylinder 15 from the pressure source. However, as shown in FIG.
It is desirable that a pressure adjusting valve V or the like be provided in each circuit that connects the cylinders 5 and 5, so that the pressure in each cylinder 15 can be automatically adjusted individually.

With the above construction, when the end of the work W is supported by the bending die 45 by 1/2 or 1/3, the pressure in the corresponding cylinder 15 is changed to the pressure in the other cylinder 15. The work W can be uniformly pressed over the entire length by adjusting the pressure to 1/2 or 1/3.

Therefore, even if the length of the bent portion of the work W is various, it can be easily accommodated.

Further, with the above configuration, for example, the pressure in the unnecessary cylinder 15 can be set to zero, and the unnecessary cylinder 15 can be held in a stopped state. By doing so, for example, it is easy to perform a bending process on both side portions divided into a plurality of portions by the notch portion and not to bend the central portion.

That is, the present invention is not limited to the above-mentioned embodiments and can be modified in various forms.

[0037]

As can be understood from the above description of the embodiments, according to the present invention, the vertical position of each depth piece in each bending groove of a plurality of bending dies can be automatically and simultaneously performed . Since it can be adjusted, the work can be bent accurately. Further, when the bending angle is insufficient at the time of bending, follow-up bending can be performed, so that the conventional problems as described above can be solved and accurate bending can be performed.

[Brief description of drawings]

FIG. 1 is a front view showing a part of a mold apparatus according to the present invention,
It is shown in a partial cross section.

FIG. 2 is a sectional view taken along line 2-2 in FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is an explanatory diagram of a configuration capable of individually adjusting the pressure in each cylinder.

FIG. 5 is a front view showing the overall structure of a press brake for easy understanding.

[Explanation of symbols]

7 Lower table 13 Base plate 15 cylinders 27 depth base 29 type base 31 Nut member 33 racks 45 bending type 47 Deep Piece

Claims (2)

(57) [Claims] 1. A plurality of support members (2) mounted on a lower table (7) of a press brake so as to be vertically movable.
5) A bending die (45) equipped with a bending groove (45G)
Respectively, in each of the bending groove (45G), provided Deipusupisu (47) for regulating the position of the bottom of the workpiece (W) which is bending to be relatively vertical position adjustment, the control of the control device Under each of the depth pieces (4
A press brake comprising an actuator (41) for automatically adjusting the relative vertical position of (7) at the same time . 2. The press brake according to claim 1, wherein each of the support members (25) is mounted on a lower table (7) via each fluid pressure device (15) so as to be vertically movable, and A press brake characterized in that the fluid pressure in each fluid pressure device (15) is individually adjustable.