JP2002018525A - Method and apparatus for back gage butting as freely moving/retreating to non-interference safety region against die, and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for back edge butting capable of avoiding interference of a die to the back gage in any case of an operation restart on the way of process or start of working of an other work, etc., and to provide a recording medium therefor. SOLUTION: A press brake P/B, etc., having a NC apparatus 1 is provided with a stretch 3 to movably support a back gage main body 2 in the left/right direction, a support body 6 which is screwed movably front/back to the stretch 3 by a drive mechanism having a ball screw 4 through a nut part 5 fixed to the stretch 3 and which is protruded backward to left/right end parts of a lower table TL to form pair and supports the drive mechanism, and a drive part to elevate the back gage main body 2 up/down. The back gage main body 2 can come freely into/out a reference point for safety axial operation at the upper depth of an apparatus main body and can be freely butted/positioned in bending work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back gauge butting device capable of moving and retracting to a non-interference safe area with a die in a bending machine such as a press brake having an NC device.

[0002]

2. Description of the Related Art In a bending machine such as a press brake having an NC device, a workpiece is brought into contact with a back gauge abutment to perform bending or the like in order to obtain the flange dimension accuracy of the workpiece. In some cases, the back gauge interferes with the die and the bending operation cannot be performed as prescribed.

[0003] In a specific model, when processing data is read and there is a possibility that the back gauge may interfere with the die, the back gauge is retracted by avoiding the situation before reaching the process, and the back gauge is retracted to prevent the interference. After the position is determined, a function of performing the positioning operation of the back gauge is provided.

[0004]

However, in the conventional example of the above technique, it is effective when the normal process progress state, that is, the current position of the back gauge and the next position to be moved are recognized. When the operation is started from an intermediate step or when processing of another workpiece is started, interference between the back gauge and the die, which does not occur during normal operation, may be induced.

[0005] The present invention has been made in view of the above circumstances, and in any case, such as when starting the operation from an intermediate step, or when trying to process another workpiece, the back gauge is used. An object of the present invention is to provide a back gauge butting device, a butting operation method, and a recording medium that can be moved and retracted to a non-interference safe region with a die that can avoid die interference.

[0006]

The present invention can solve the above-mentioned problems by providing the following constitution.

(1) In a bending machine such as a press brake having an NC device, a stretch for movably supporting the back gauge body in the left-right direction, and the stretch is fixed to the stretch by a drive mechanism having a ball screw. A support member which is screwed movably in the front-rear direction via a nut portion, extends and projects rearward at left and right end portions of the lower table to form a pair, and further supports the driving mechanism; A drive unit that allows the gauge body to move up and down, allowing the back gauge body to freely enter and exit a safety area having a safe axis operation reference point at the upper back of the processing machine body, and abutment during bending. A back gauge butting device that can be moved and retracted to a safe area where it does not interfere with the die, characterized in that it can be positioned freely.

(2) In the back gauge striking operation method in bending of a press brake or the like having an NC device, the striking position detecting means detects the current position of the back gauge striking simultaneously with the generation of a start command of the machining operation. And a step of comparing the current position of the back gauge abutment with a positional relationship between a preset safety axis operation reference point of the back gauge abutment,
When the current position of the back gauge abutment is close to the die side, the back gauge abutment temporarily includes moving to a safe axis operation reference point, retreating, and thereafter positioning to a predetermined position. A back gauge butting operation method that can be moved and retracted to a safe area where there is no interference with the die.

(3) A recording medium storing a program for realizing the back gauge butting operation method described in (2) above.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below.

FIG. 1A is a perspective view showing a configuration of a back gauge butting device provided in a press brake as an example of a bending machine, and FIG. FIG. 2 is a flowchart showing the operation of the back gauge according to the present invention (an example of a case where the operation is started in the middle of machining), and FIG.
9 is a flowchart (example of a case of normal operation) showing the operation of the back gauge.

This will be described below with reference to the drawings.

An outline of the configuration of a back gauge butting device of a press brake as an example of a bending machine will be described with reference to FIG. 1. Reference numeral 1 denotes an NC device which controls the entire press brake. Reference numeral 2 denotes a back gauge body, and the back gauge body 2 is provided with a press brake (hereinafter referred to as P
/ B) A pair of support members 6, 6 which are provided at the rear portion and extend and project rearward at the left and right ends of the lower table TL.
The support members 6 are provided with ball screws 4 driven by motors 7 and linear motion guides 8 parallel to the ball screws 4. By moving the nuts 5 and 5 screwed with the ball screws 4 and 4 in the front and rear (L-axis) direction by the motors 7 and 7, the stretch 3 extending in the left and right (Y-axis) longitudinal direction becomes front and rear (on the L-axis). Can be positioned freely. A pair of abutments 2a, 2a are provided on the stretch 3, and are configured to be movable in a vertical direction (Z axis) by a micromotor (not shown), that is, to be able to move up and down.

Generally, the axis for moving the butting 2a in the front-rear direction is the L axis, the L-axis driving means is a motor 7, the axis for moving the butting 2a up and down is the Z axis, and the Is defined as a Y-axis, and this Y-axis movement is of a rack and pinion type.

The position detecting means for each of the L-axis, Y-axis, and Z-axis is formed by encoders of the respective drive motors, so that abutting position can be managed.

The drive motors for the L-axis, Y-axis and Z-axis may be of a cylinder type. In this case, for example, the drive motor may be configured to be capable of positioning in multiple stages such as upper, middle and lower stages. You can also.

As shown in FIG. 1 (b), the safety axis operation reference point in the non-interference safe area with the die is located in the upper part of the body of the press brake P / B, and abuts as necessary. 2a temporarily moves and retracts to this safety axis operation reference point,
Thereafter, a position H2 where the height is higher than the height H1 of the die and which does not interfere with the die is confirmed, and the position is moved in the order of to perform the abutting positioning.

The operation will be described with reference to the above configuration and drawings.

An example of the case where the operation is started in the middle of machining will be described with reference to the flowchart of FIG. 2 showing the operation of the back gauge according to the present invention.

In step S1, the operation switch is turned on. In step S2, the current position of the back gauge butting 2a is simultaneously detected by the position detecting means formed by the encoder. In step S3, the current position of the back gauge butting 2a is detected. Is closer to the die side than the safe axis operation reference point,
If it is ES and located inside, the next step S4
Then, the back gauge abutment 2a moves and retracts to the safe axis operation reference point, and then confirms the height of the die, and considers the value, and sets the target movement height of the back gauge abutment 2a. , The lateral position, etc., is moved forward to a predetermined position for bending, abutting positioning is performed (step S5), the process proceeds to step S6, bending is performed, and the processing is completed and a predetermined operation is performed. The process ends.

Next, the operation of the back gauge as an example of the normal operation case will be described with reference to the flowchart of FIG.

In step S101, the worker checks the material conditions (conditions such as work material, plate thickness, bending length, etc.)
Enter the die conditions (conditions such as punch tip R, punch height, die width, die height, die depth size) into the NC device, or select desired conditions from the screen of the NC device and bend. Create a program.

At this point, the value of the safety axis operation reference point (for example, the value of the distance dimension) may be set and input.

In step S102, the operator turns on a switch such as a button and / or a foot pedal on the operation panel to start operation.

When the machining program is started from the beginning, the back gauge (B / G) butting 2a starts from the origin position and starts moving as it is. Therefore, it is moved and positioned to a predetermined position that does not interfere with the die. Next, step S1
At 05, the bending process is performed, and the process is completed, and the process ends.

[0026]

According to the present invention, the interference between the back gauge and the die can be avoided in any case, such as when starting operation from an intermediate step or when starting machining of another work. It is possible to move / evacuate to a safe area where there is no interference with the robot, and it is possible to prevent trouble beforehand.

[Brief description of the drawings]

FIG. 1A is a perspective view illustrating a configuration of a back gauge butting device provided in a press brake as an example of a bending machine, and FIG. 1B is a perspective view of a back gauge butting and a safe axis operation reference point. Explanatory diagram showing positional relationship

FIG. 2 is a flowchart showing the operation of the back gauge according to the present invention (an example of a case where the operation is started during the processing).

FIG. 3 is a flowchart showing the operation of the back gauge (an example of a case of normal operation).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 NC apparatus 2 Back gauge (B / G) main body 2a Butt 3 Stretch 4 Ball screw 5 Nut part 6 Support body 7 Motor 8 Linear motion guide P / B Press brake

Claims (3)

[Claims] In a bending machine such as a press brake having an NC device, a stretch for movably supporting a back gauge body in a left-right direction and a nut fixed to the stretch by a drive mechanism having a ball screw. A support member that is movably screwed in the front-rear direction via a portion, extends and protrudes rearward at left and right ends of the lower table to form a pair, and further supports the driving mechanism; A drive unit that allows the main body to move up and down,
A non-interference safety with a die, wherein the back gauge body can freely enter and exit a safety area having a safety axis operation reference point at the upper back of the processing machine body, and can be abutted and positioned at the time of bending. Back gauge butting device that can be moved and retracted to the area. 2. A back gauge striking operation method in a bending process of a press brake or the like having an NC device, wherein a striking position detecting means detects a current position of the back gauge striking at the same time as a start command of a machining operation is generated. And, comparing the current position of the back gauge butting, the positional relationship between the safety axis operation reference point of the previously set back gauge butting,
When the current position of the back gauge abutment is close to the die side, the back gage abutment once includes moving to a safe axis operation reference point, retreating, and thereafter positioning to a predetermined position. A back gauge butting operation method that can be moved and retracted to a safe area where there is no interference with the die. 3. A recording medium storing a program for realizing the back gauge butting operation method according to claim 2.