JPH08108218A - Bending method and its device - Google Patents

Abstract

PURPOSE: To start the advancing motion of a back gauge in accordance with a worker's experience and work rhythm by stepping on a foot pedal with an upper table or a lower table staying at the upper limit or the lower limit. CONSTITUTION: In the bending of a work W, when a worker steps on a foot pedal 19A for elevating, a hydraulic cylinder 9 is actuated through a servo valve 31, and a lower table 11 is elevated. Upon reaching the upper limit, the lower table 11 is lowered by the worker stepping on a foot pedal 19B for lowering. By repeating this operation, bending is performed on the work W with the cooperation of a punch P and a die D. In advancing a back gauge B, G, the worker steps on the foot pedal 19B for lowering when the lower table 11 is at the lower limit, driving a driving motor 29 and advancing the stopper of the back gauge B, G.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending method and apparatus for controlling movement of a back gauge for advancing according to the shape of a work.

[0002]

2. Description of the Related Art Conventionally, for example, a press brake as a bending device has a back gauge movable in the front-rear direction, and a work is abutted against the back gauge to move the lower table up and down with respect to the upper table. It is already known that a punch provided in the lower portion and a die provided in the upper portion of a lower table cooperate to bend a work.

For example, as shown in FIG. 6 (A), when the work P is bent by the cooperation of the punch P and the die D, the work W having a complicated shape is extracted from the punch P. Back gauge B. which is provided behind the die D. I set an idle timer to move G forward.

Further, as shown in FIG. 6 (B),
When the work is bent by the cooperation of the punch P and the die D, the Z-shaped work W is back gauge G. When sliding it under B, back gauge B. G is moved forward by setting an idle timer.

[0005]

By the way, the conventional back gauge B. When G is set by a timer, if the timer time is short, it may be dangerous because it may interfere with the work W. Further, if the timer time is too long, there is a problem that it takes too much processing time.

Further, if the work is delayed while holding the work W with both hands, the back gauge B. There was a problem that the operation to stop the forward movement of G could not be performed.

An object of the present invention is to provide a bending method and apparatus for activating the operation of advancing the back gauge in accordance with the operator's habit and work rhythm.

[0008]

In order to achieve the above object, the bending method of the present invention according to claim 1 is one of an upper table having a punch at a lower portion and a lower table having a die at an upper portion. By operating the foot pedal up and down, the punch and die cooperate with each other to bend the work positioned by abutting against the tip of the back-and-back movable back gauge provided behind the die. In the method, when the upper table or the lower table is at an upper limit or a lower limit, an ascending foot pedal or a descending foot pedal provided in the foot pedal is O.
When N, the back gauge moves to move forward.

According to a second aspect of the present invention, in the bending apparatus, one of an upper table having a punch at the lower portion and a lower table having a die at the upper portion is moved up and down by operating a foot pedal to form a punch and a die. In a folding device that collaborates to bend a work positioned by abutting against the tip of a back gauge that is movable behind and behind the die, in the foot pedal, an ascending foot pedal and a descending foot pedal are provided. And a control device for turning on the back gauge drive motor so that the back gauge moves forward when the ascending foot pedal or the descending foot pedal is turned on when the upper table or the lower table is at the upper limit or the lower limit. It is a feature.

[0010]

According to the bending method and the apparatus therefor according to claims 1 and 2, when the ascending foot pedal or the descending foot pedal is ON while the upper table or the lower table is at the upper limit or the lower limit, The back gauge is moved to move forward. Therefore, the operator can set the timing for advancing the back gauge while checking the work, so that the back gauge can be activated in accordance with the operator's habit and work rhythm.

[0011]

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

Referring to FIG. 1, for example, a press brake 1 as a bending device is provided with a lower frame 3,
Side frames 5 are erected on both sides of the lower frame 3. An upper table 7 is fixedly provided on the front upper part of the side frame 5, and
A punch P is attached to the tip (lower part) of the upper table 7.

A plurality of hydraulic cylinders 9 are attached to the lower portion of the front side of the side frame 5, and a lower table 11 is vertically movable via a piston rod mounted on the hydraulic cylinders 9. A die D is attached to a tip portion (upper portion) of the lower table 11 at a position corresponding to the punch P.

A back gauge B. for positioning the work W is provided on the recess 13 formed on the side frame 5. G is provided so as to be movable back and forth (left and right in FIG. 1). This back gauge B. The G has a plurality of abutments 15 for abutting the work W for positioning.
Further, the side frame 5 has a press brake 1, a back gauge B. A control device 17 for controlling G is provided. The control device 17 includes, for example, the lower table 1
A foot pedal 19 for moving 1 up and down is connected.

The back gauge B. As G, as shown in FIG. 2, the abutment 15 is attached to the abutment stretch 21 extending in the left-right direction (the direction orthogonal to the paper surface in FIG. 2). This butt stretch 21
Is screwed into a ball screw 23 extending in the front-rear direction (left-right direction in FIG. 2). The front end portion (the right end portion in FIG. 2) of the ball screw 23 is pivotally supported by a bearing 25 and the rear end portion (the left end portion in FIG. 2) of the ball screw 23.
A drive motor 29 having an encoder 27 as a position detector is connected to the.

With the above construction, when the drive motor 29 is driven, the ball screw 23 is rotated and the abutting stretch 21 is moved in the front-rear direction. Therefore, since the abutment 15 is attached to the abutment stretch 21, the abutment 15 is also moved in the front-rear direction.

The connection system of the control device 17, the foot pedal 19, the hydraulic cylinder 9 and the drive motor 29 is shown in FIG.
Is shown in. That is, in FIG. 3, the foot pedal 19 includes an ascending foot pedal 19A and a descending foot pedal 19B.
The A and the descending foot pedal 19B are connected to the hydraulic cylinder 9 via a servo valve 31 in the control device 17. Further, the descending foot pedal 19B is connected to the drive motor 29 via the servo amplifier 33 in the control device 17. Moreover, when the lower table 11 is at the lower limit and the lower foot pedal 19B is stepped on by the foot to turn it on, the drive motor 29 is driven via the servo amplifier 33 and the abutment 21 moves forward. .

With the above-described structure, when the work W is bent, the operator positions the abutment 21 at a desired position, and then the operator steps on the lifting foot pedal 19A with a foot.
Then, the hydraulic cylinder 9 is actuated via the servo valve 31 to raise the lower table 11. When the lower table 11 reaches the upper limit, the operator depresses the descending foot pedal 19B with his / her foot to turn it on to turn on the servo valve 3
1, the hydraulic cylinder 9 is operated to operate the lower table 11
Is lowered. Such a lifting foot pedal 19A,
By alternately repeating the descending foot pedal 19B and stepping on it with the foot, the lower table 11 is moved up and down, and the work P is bent by the cooperation of the punch P and the die D.

A conventional back gauge B.3 as shown in FIGS. 6 (A) and 6 (B). In the case of advancing G, FIG.
It is operated based on the flowchart shown in FIG. That is, in FIG. 4, it is determined in step S1 whether or not the lower table 11 is in the lower limit state and the down foot pedal 19B is depressed by the foot.
9B is stepped on, the drive motor 29 is driven in step S2, and the back gauge B.B. The G butting 21 is advanced. The movement amount of the abutment 21 at this time is detected by the encoder 27.

At step S1, the descending foot pedal 19B
If the foot is not stepped on, the drive motor 29
Back gauge B. The G butting 21 remains stopped.

In this way, the back gauge B. Instead of advancing G, the back gauge B. Since G is moved forward, it is possible to avoid a dangerous state, and it is possible to perform the setting without changing the idle timer setting time according to the habit of the worker and the rhythm of the work. It is possible to easily deal with already-delivered machines by only partially changing the inside of the control device 17, that is, adding software.

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 example of the press brake 1 that fixes the upper table 7 and raises the lower table 11 has been described, but a press brake 1 that fixes the lower table 11 and lowers the upper table 7 can also be used. In this case, based on the flow chart shown in FIG. 5 instead of FIG. G will be advanced.

That is, in FIG. 5, in step 4,
When the upper table 7 is in the upper limit state and it is determined whether or not the lift foot pedal 19A is stepped on, and the lift foot pedal 19A is stepped on, the drive motor 29 is driven in step S5 to drive the back gauge B. ． The G butting 21 is advanced. The movement amount of the abutment 21 at this time is detected by the encoder 27.

In step S4, the lifting foot pedal 19A
When the foot is not stepped on, the drive motor 29 is step S6.
Back gauge B. The G butting 21 remains stopped. The effect at this time is also the same as that of the above-described embodiment.

[0025]

As can be understood from the above description of the embodiments, according to the inventions of claims 1 and 2, when the upper table or the lower table is in the upper limit or the lower limit state, the lifting foot pedal or When the descending foot pedal is turned on by freely moving it, the back gauge moves forward without the need to change the idle timer setting time automatically. Therefore, it is possible to avoid the forward movement of the back gauge from being in a dangerous state, and it is possible to perform it without the need to change the predetermined time of the idle timer according to the habit of the worker and the work rhythm.

[Brief description of drawings]

FIG. 1 is a side view of a press brake as a folding device according to an embodiment of the present invention.

FIG. 2 is a side view of a back gauge moving mechanism.

FIG. 3 is an explanatory diagram of a connection system such as a foot pedal and a control device.

FIG. 4 is a flowchart for advancing a back gauge when raising a lower table.

FIG. 5 is a flowchart for moving the back gauge forward when lowering the upper table.

FIG. 6 is an example diagram of advancing a back gauge during a conventional bending process.

[Explanation of symbols]

 1 Press Brake (Bending Device) 7 Upper Table 9 Hydraulic Cylinder 11 Lower Table 15 Strike 17 Control Device 19 Foot Pedal 19A Lift Foot Pedal 19B Fall Foot Pedal 21 Strike Stretch 27 Encoder (Position Detector) 29 Drive Motor

Claims (2)

[Claims] 1. An upper table having a punch on the lower side and a lower table having a die on the upper side are moved up and down by operating a foot pedal, and the punch and the die cooperate with each other to move the die to the rear of the die. In a bending method of bending a work positioned by abutting against the tip of a back gauge movable back and forth provided, in a state where the upper table or the lower table is at the upper limit or the lower limit,
A bending method, wherein the back gauge is moved to move forward when the ascending foot pedal or the descending foot pedal provided in the foot pedal is ON. 2. An upper table having a punch on the lower side and a lower table having a die on the upper side are moved up and down by operating a foot pedal, and the punch and the die cooperate with each other to move the rear side of the die. A bending device for bending a work positioned by abutting against the tip of a back gauge that is movable back and forth, wherein the foot pedal includes an ascending foot pedal and a descending foot pedal, and the upper table or the lower table. The bending apparatus is provided with a control device for turning on the back gauge drive motor so that the back gauge moves forward when the ascending foot pedal or the descending foot pedal is turned on at the upper limit or the lower limit.