JP3406400B2 - Back gauge butting position control apparatus and method for bending machine - Google Patents

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 position control device and method for a back gauge of a bending machine, and more particularly to a Y-axis direction for performing step bend processing.
The present invention relates to a back gauge butting position control device for a back gauge of a bending machine and a method thereof, in which the butting does not collide with a mold when the back gauge moves with respect to a plurality of dies arranged at appropriate intervals .

[0002]

2. Description of the Related Art FIG. 8 shows a back gauge 101 conventionally used for a press brake or the like as a bending machine.
Shows. The press brake bends the work W by the cooperation of the punch 105 fixed to the upper panel 103 and the die 109 provided at the upper end of the ram 107 which is opposed to the punch 105 and is vertically driven. At this time, in order to position the work W, the die 109
A back gauge 101 is provided behind (in the + axis direction).

[0003] The back gauge 101 is provided with the guide 111 parallel two near left and right ends of the lower panel protrudes rearward (in the drawing L + direction) of the lower <br/> panel, this A beam 113 is extended on the guide 111 in the left-right direction (Y direction in the drawing). Guide 111
Is provided with an L-axis motor 115, which is a moving unit for moving the beam 113 in the L-axis direction, and a ball screw 117. The L-axis motor 115 rotationally drives the ball screw 117 to move the beam 113 in the L-axis direction. Move to. The L-axis motor 115 has a rotary encoder 119.
Is attached, and the position of the beam 113 is detected.

On the front surface of the beam 113, there is provided a pair of butts 121 which can move in the left-right direction along the beam 113. The pair of abutments 121 are moved by rotationally driving a ball screw (not shown) by Y-axis motors 123, which are abutting moving means provided at the left and right ends of the beam 113, and their positions in the Y-axis direction are the Y-axis motors. 1
It is detected by a rotary encoder 125, which is an abutting position confirmation means attached to 23.

Further, the abutment 121 has a Z-axis motor 127 which is an abutment moving means, which is moved in the Z-axis direction by rotationally driving a ball screw (not shown), and its Z
The position in the axial direction is detected by a rotary encoder 129 which is an abutting position confirmation means attached to the Z-axis motor 127.

As a result, the abutment 121 can be moved and positioned in the L-axis direction (front-back direction), the Y-axis direction (left-right direction), and the Z-axis direction (vertical direction).

Referring to FIG. 9, a conventional method for moving and positioning the abutment 121 in the bending process is as follows.
Is raised once, and the beam 113 is moved forward to hit the butt 12
1 is moved above the die 109. At this time, the distance to move forward is determined by determining the depth (A in the drawing) of the die 109 from the input data, and the back gauge 101 is moved forward by the operation shown by the arrow in the drawing, and then the abutment 121 is moved to the die 10.
Positioning is performed by descending to the upper surface of 9. By moving the abutment 121 in this manner, the die 1
The positioning was performed without colliding with 09.

[0008]

However, in such a conventional technique, in order to reduce the setup time for changing the mold when bending is performed by a bender capable of a single load or an axial tilt. A problem arises when so-called step bend processing is performed in which a plurality of dies 109 are set at one time and then a series of bending operations are sequentially performed.

That is, although there is no problem when a plurality of dies 109 having the same height are used, as shown in FIG. 10, when bending is performed with a low die 109 and then with a high die 109, When the abutment 121 is moved in the left-right direction, the abutment 121 may collide with the target high die 109 even when accompanied by ascending movement, resulting in inefficient step bending and machine failure. There is a risk of falling.

The object of the present invention has been made by paying attention to the above-mentioned conventional techniques, and even when a series of bending processes using a plurality of molds having different heights are performed, the molds collide. An object of the present invention is to provide an abutting position control device and method for a back gauge of a bending machine that can move the abutting force without doing so.

[0011]

According to a first aspect of the present invention, there is provided a back gauge butting position control device for a back gauge of a bending machine.
In order to achieve the above object, a bending condition input means, a bending program determining means for determining a bending program based on the data input to the bending condition input means, and data input by the bending condition input means The abutting position determining means for determining the target position of the abutting of the back gauge based on each process, and the abutting position determining means arranged at appropriate intervals in the Y-axis direction.
Positioning the butts against multiple dies
When performing the end processing, the abutment is set in the L-axis direction, Y-axis direction, Z
An abutment moving unit that moves in the axial direction, a movement control unit that controls the abutment moving unit to position the abutment at the position determined by the abutment position determination unit, and a protrusion that confirms the current position of the abutment. The movement control section is provided with an abutting position confirmation means, and an L-axis position determination means for determining whether or not the current position of the abutment is in a preset L-axis safety area and transmitting it to the movement control section. The current position of the butting is L
If it is in the axis safety area, it is controlled to move to the final target, but if the current position of the abutment is not in the L axis safety area, it is moved to the L axis safety area and then moved to the final target. It is characterized by being.

In order to achieve the above-mentioned object, the back gauge abutment positioning control device for a bending machine according to a second aspect of the present invention is based on bending condition input means and data input to this bending condition input means. Bending program determining means for determining a bending program, an abutting position determining means for determining a target position of the back gauge abutting in each process based on the data input by the bending condition inputting means, and a Y axis direction. Pair multiple dies at appropriate intervals
To position the butts and perform step bend processing
Further, the abutment moving means for moving the abutment in the L-axis direction, the Y-axis direction, and the Z-axis direction, and the abutment moving means is controlled to position the abutment at the position determined by the abutment position determining means. A movement control unit, and the movement control unit is configured to control the abutment to pass a position higher than the Z-axis target value by a predetermined amount when the abutment is moved to a target position. It is a feature.

In order to achieve the above-mentioned object, the method for abutting and positioning the back gauge of the bending machine according to the third aspect of the present invention determines the bending program based on the data inputted by the bending condition inputting means, and steps. Ben
The target position in the L-axis direction, the Y-axis direction, and the Z-axis direction of the back gauge abutment in each process of the machining is determined, and if the target position is different from the current position, the current abutment position is preset. It is judged whether it is within the L-axis safe area, and the current position L
When the axis value is in the L-axis safety area, it moves above the Z-axis target value by a predetermined amount and moves to the Y-axis target value, then to the L-axis target value and then to the Z-axis target value. L
If the axis value is not in the L-axis safety area, it first moves to the L-axis safety area, then moves a predetermined amount above the Z-axis target value and to the Y-axis target value, then to the L-axis target value, and then to Z It is characterized by moving to the axis target value.

In order to achieve the above object, the back gauge abutment positioning method for a bending machine according to a fourth aspect of the present invention determines a bending program based on the data input by the bending condition inputting means, and steps. Ben
The target position of L-axis, Y-axis, and Z-axis direction of the back gauge abutment in each process of machining is determined. If the target position is different from the current position, the Z-axis target value is higher than the Z-axis current value. If the Z-axis target value is higher than or equal to the Z-axis current value, move to a position higher by a predetermined amount than the Z-axis target value and then move to the L-axis and Y-axis target values. From the Z axis target value, but when the Z axis target value is lower than the Z axis current value, it moves to the L axis and Y axis target values and then to the Z axis target value. is there.

[0015]

In the butt-positioning control device for the back gauge of the bending machine according to the first aspect, when the operator inputs the processing data by the bending condition input means, the bending program determining means determines the bending program based on the processing data. Therefore, various conditions such as the position, height and depth of the mold used for the step bend processing are determined. Also, the abutting position determining means is step bend based on the processing data.
The positions of the back gauge butting against the die in each process of processing are determined in the L-axis direction, the Y-axis direction, and the Z-axis direction. The current position of the abutment confirmed by the abutment position confirmation means is compared with the preset L-axis safety area by the L-axis position determination means, and it is determined whether or not the abutment is in the L-axis safety area and movement control is performed. Transmitted to the department. Then, when the abutment is in the L-axis safety area, the movement control unit controls the abutment moving means to move and position the abutment to the final target, but when the abutment is not in the L-axis safety area. The moving means is controlled so that the abutment is once moved to the L-axis safety area and then moved to the final target.

In the abutment positioning control device for the back gauge of the bending machine according to the second aspect, when the operator inputs the processing data by the bending condition input means, the bending program determining means determines the bending program based on the processing data. Therefore, various conditions such as the position, height and depth of the mold used for the step bend processing are determined. In addition, the abutting position determination means uses step machining based on the machining data.
The positions of the back gauge butting against the die in each of the machining steps are determined in the L-axis direction, the Y-axis direction, and the Z-axis direction. Then, when the abutment is moved, the movement control unit performs control so that the abutment always passes a position higher than the Z-axis target value by a predetermined amount.

According to the back gauge abutment positioning method of the bending machine according to the third aspect, the bending program is determined based on the data input by the bending condition input means, and the abutment of the back gauge in each step of the step bending is performed. The target positions in the L-axis direction, the Y-axis direction, and the Z-axis direction are determined. Then, when the target position is different from the current position, it is determined whether or not the current position of the butting is within the preset L-axis safety region, and when the L-axis value of the current position is within the L-axis safety region. If the L-axis value at the current position is not in the L-axis safety area, after moving to the Y-axis target value by a predetermined amount above the Z-axis target value, then moving to the L-axis target value and then to the Z-axis target value After moving to the L-axis safe area, after moving to the Y-axis target value by a predetermined amount above the Z-axis target value, L
It moves to the axis target value and then to the Z axis target value.

In the back gauge butt positioning method of the bending machine according to the fourth aspect, the bending program is determined based on the data input by the bending condition input means, and the back gauge butt in each step of the step bending process is performed. The target positions of the L-axis direction, the Y-axis direction, and the Z-axis direction are determined. When the target position is different from the current position, it is determined whether the Z-axis target value is higher than the Z-axis current value, and Z
If the axis target value is higher than or equal to the Z axis current value, after moving to a position higher than the Z axis target value by a predetermined amount, the L axis and Y axes are moved.
After moving to the Z-axis target value after moving to the axis target value, if the Z-axis target value is lower than the Z-axis current value, move to the L-axis and Y-axis target values and then move to the Z-axis target value. .

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the drawings.

Here, since the structure of the back gauge 101 is the same as that of the conventional one described above, the same reference numerals are used for the same members, and the description thereof will be omitted.

FIG. 1 shows the entire back gauge positioning control device 1 of the bending machine. The CPU 3 is connected to a keyboard 5 as a bending condition input means, and a movement control section 7 for controlling the L-axis motor 115, the Y-axis motor 123, and the Z-axis motor 127 as a butt movement means.
The abutting position confirmation means 9 for receiving the position signals from the encoders 119, 125 129 attached to the motors 115, 123, 127 are connected.

The CPU 3 has an input data memory 11 for storing data input from the keyboard 5 and a bending program memory 13 for storing a bending program. The CPU 3 selects a predetermined bending program from the bending program memory 13 by the bending program determining means 15 based on the input data. Based on the selected flexural program and input data, stearyl
In the up-bend processing, the abutting position determining means 17 for determining a position for bending after the abutting is the CPU 3
Is equipped with.

In addition, the CPU 3 determines the area where the abutment 121 and the die 109 do not collide from the input data,
That is, it has an L-axis safety area memory 19 for storing the L-axis safety area. Then, the L-axis safety area memory 19
Based on the above, it is compared with the position data from the abutting position confirming means 9 described above to determine whether or not the abutment 121 of the back gauge in each step of the step bend machining is in the L-axis safety region. Means 21 are provided in the CPU 3.

The CPU 3 controls the movement control section 7 according to the judgment of the L-axis position confirming means 9 to move and position the abutment 121.

4 to 7 show examples of movement patterns of the abutment 121 which do not collide with the die 109 due to the difference in the current position of the abutment 121.

FIG. 4 shows the pattern A. This pattern A is composed of a plurality of dies arranged at appropriate intervals in the Y-axis direction.
Position the abutment 121 against the 109 and step
The die 1 is moved by the butting position confirming means 9 even when the butting 121 is moved in the Y-axis direction (horizontal direction) at the time of performing the banding process.
This is the case where it is confirmed that the L-axis is in a safe area where it does not collide with 09. In this case, even if the beam 113 is moved in the Y-axis direction, it does not collide with the die 109.

Therefore, the movement controller 7 first detects the Z-axis motor 1
27 is driven to start positioning to the Z-axis target value (height of the die 109 to be used for the next bending process) + dmm (for example, 1 mm), and at the same time, the Y-axis motor 123 is also driven to start Y-axis positioning. . After completion, the L-axis motor 115 is driven to start positioning to the L-axis target value. When the L-axis positioning is completed, the Z-axis motor 127 lowers the abutment 121 to position the Z-axis target value.

Alternatively, first, the Z-axis and the Y-axis are simultaneously started to move, and when positioning to the L-axis target value, dm is set in the Z-axis direction.
The abutment 121 is set to the die 109
It does not have to collide with, and various movement sequences are possible.

FIG. 5 shows the pattern B. This pattern B is abutting 1 when performing step bend processing.
This is the case when it is confirmed that 21 is not within the L-axis safe area.
In this case, when the beam 113 is moved in the Y-axis direction, the abutment 121 may collide with the die 109.

Therefore, the movement control unit 7 first determines the L-axis motor 1
15 is driven to move in the L-axis direction and positioned within the L-axis safety area. After that, it is moved and positioned in the same manner as the pattern A described above. Also in this case, it is sufficient that the abutment 121 does not collide with the die 109, and various movement sequences can be considered, as described above.

FIG. 6 shows a pattern C. This pattern C is a case in which the pattern C, together with the pattern D to be described later, does not move largely in the L-axis direction and is once positioned in the L-axis safety area as in the patterns A and B described above. Pattern C is the case where the abutment 121 is below the Z-axis target value when performing the step bend processing . In this case, when the abutment 121 moves on the beam 113 in the Y-axis direction, the abutment 121 contacts the die 109. There is a risk of collision.

Therefore, the movement control unit 7 first determines the Z-axis motor 1
27 is driven to start positioning to the Z-axis target value + 1 mm (dmm) mm. Then, the Y-axis motor 123 and the L-axis motor 115 are driven to start positioning at the Y-axis target value and the L-axis target value. When the positioning of the Y-axis and the L-axis is completed, the abutment 121 is lowered to position the Z-axis target value.

FIG. 7 shows a pattern D. That is, the pattern D is a case where the abutment 121 is above the Z-axis target value when performing step bend processing ,
In this case, the abutment 121 does not collide with the die 109 even if it moves on the beam 113 in the Y-axis direction.

Therefore, the movement controller 7 controls the Y-axis motor 123.
Then, the L-axis motor 115 is driven to start positioning at the Y-axis target value and the L-axis target value. When the positioning of the Y-axis and the L-axis is completed, it is lowered and positioned to the Z-axis target value.

However, in the patterns A to D described above, the input data is used for the step bend machining.
If the height, depth, attachment position, etc. of each die 109 to be executed are not known, the step is executed only when the data necessary for executing the step is input from the keyboard 5. That is, instead of positioning in two or more directions at the same time, inputs are sequentially performed in an order that avoids interference with the die 109.

On the other hand, each die 109
When the height, depth, mounting position, etc. are known, it is not necessary to input data when executing each step, and positioning is performed automatically.

Next, the back gauge positioning control for avoiding the collision with the die 109 by using the above-mentioned movement pattern will be described with reference to FIGS. 2 and 3.

FIG. 2 shows a case where the collision with the die 109 is prevented by the L-axis position. This case can be applied to the case where the height, depth, mounting position, etc. of each die 109 can be known from the input data, or to the case where data necessary for each process is sequentially input.

First, the bending condition is input by the bending condition input means 3 (step SA1), the bending program determining means 5 determines a bending program, and the abutment position determining means 17 determines a target value of the abutment 121. (Step SA2). Next, the die 1 currently used by this target value
09 (step SA3), that is, die 1
If there is no change in 09, the bending process is continued at that position (step SA4).

Subsequently, the L-axis position determining means 21 determines whether or not the current butting 121 position by the butting position confirming means 9 is in the L-axis safety area (step SA5), and is in the L-axis safety area. In this case, the movement control unit 7 controls the abutting movement means 15 according to the above-described pattern A (see FIG. 4) (steps SA6 to SA8) and completes the positioning (step SA9).

On the other hand, when the position of the abutment 121 is not in the L-axis safe area, the movement control unit 7 causes the pattern B (see FIG. 5) described above.
According to the reference), the abutting moving means 15 is controlled (steps SA10 to SA13) to complete the positioning (step SA14).

FIG. 3 shows a case where the collision with the die 109 is prevented by the Z-axis movement. In this case,
Also, as shown in FIG. 5, when there is another die 109 higher than the target die 109, there is a risk of collision, so automatic movement positioning based on the input data is performed. Is not suitable. Therefore, it is necessary to input necessary data when executing each process.

First, the bending condition is input by the bending condition input means 3 (step SB1), the bending program determining means 5 determines the bending program, and the abutting position determining means 17 determines the target value of the abutting 121. (Step SB2). Next, the die 1 currently used by this target value
09 (step SB3), that is, die 1
If there is no change in 09, the abutment 121 does not move (step SB4).

Subsequently, it is judged whether or not the current butting 121 position by the butting position confirming means 9 is smaller than the Z value of the next target value (step SB5), and if the present position is smaller, The movement control unit 7 controls the abutting movement means 15 according to the above-described pattern C (see FIG. 6) (steps SB6 to SB8) and completes the positioning (step SB).
9).

On the other hand, when the current butting position 121 is larger than the Z value of the next target value, the movement controller 7 controls the butting / moving means 15 according to the above-mentioned pattern D (see FIG. 7) ( The positioning is completed (steps SB10 and SB11) (step SB12).

As described above, according to the abutment positioning control device and method for a back gauge of such a bending machine, when a collision with the die 109 is prevented by the L-axis position, the abutment 121 is used. Moves in the Y-axis direction and the Z-axis direction within the L-axis safety area, so that the collision with the die 109 is prevented. In this case, once L
Since the robot moves within the axis safety region while avoiding the movement, it is possible to automatically perform positioning by knowing the height, depth, mounting position, etc. of each die 109 from the bending conditions input in advance.

When the collision with the die 109 is prevented by the Z-axis movement, the collision with the die 109 is prevented because it moves in the Y-axis direction and the Z-axis direction above the target Z value. It Further, in this case, since there is no avoidance in the L-axis direction, it is possible to quickly move and position the target.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes. That is, although the above-described embodiment has been described as applied to a press brake which is a bending machine, it can also be applied to other bending machines and shearing machines.

In the above patterns A and B,
The main idea is to temporarily avoid the L-axis safety area and move the butting in the Y-axis direction and the Z-axis direction within this area. Which direction to move first, or to move at the same time, etc. Not limited.

Further, the movement and positioning of the abutment 121 may be automatically performed using the processing data, or may be performed while inputting necessary data according to each movement stage.

[0051]

The abutment positioning control device for the back gauge of the bending machine according to the first aspect of the present invention is as described above. When the operator inputs the processing data by the bending condition input means, this processing data is stored. Since the bending program determination means determines the bending program based on
It is also possible to automatically determine various conditions such as the position, height and depth of the mold used for step bend processing . Furthermore, the position determining means abutting on the basis of the machining data step
It is also possible to automatically determine the positions of the back gauge butting against the die in the L-axis direction, the Y-axis direction, and the Z-axis direction in each step of the pbending process . The present position of the abutment confirmed by the abutment position confirmation means is compared with the preset L-axis safety area by the L-axis position determination means, and the abutment is L
It is determined whether or not it is in the axis safety area and the result is transmitted to the movement control unit. Then, when the abutment is in the L-axis safety area, the movement control unit controls the abutment moving means to move and position the abutment to the final target, but when the abutment is not in the L-axis safety area. Since the moving means is controlled so that the abutment is once moved to the L-axis safety region and then moved to the final target, the abutment can be moved to the target position for the next bending without colliding with the mold. .

In the butting position control device for the back gauge of the bending machine according to the second aspect of the present invention, when the operator inputs the processing data by the bending condition input means, the bending program determining means makes the bending program based on the processing data. Therefore, it is possible to automatically determine various conditions such as the position, height, and depth of the mold used for step bend processing . Further, the abutting position determining means is based on the processing data, and the abutting position of the back gauge with respect to the mold in each step of the step bend machining is in the L-axis direction, Y.
It is also possible to automatically determine the positions in the axial direction and the Z-axis direction. In addition, since the movement control unit controls the abutment to pass a position higher than the Z-axis target value by a predetermined amount when the abutment is moved to the target position, the abutment does not collide with the mold and It is possible to move to a target position for performing the bending process. Further, since the avoiding operation in the L-axis direction is not necessary, the abutment can be moved and positioned quickly.

According to the back gauge abutment positioning method for a bending machine of the present invention, the bending program is determined based on the data input by the bending condition inputting means, and the back gauge in each step of the step bending is performed. It is also possible to automatically determine the L-axis direction, Y-axis direction, and Z-axis direction target positions of the butting of. When the target position is different from the current position, it is determined whether the current position of the abutment is within the preset L-axis safety area, and when the L-axis value of the current position is within the L-axis safety area, the Z-axis is determined. If the L-axis value at the current position is not within the L-axis safety area, the target value is a predetermined amount above the Y-axis target value, then the L-axis target value, and then the Z-axis target value. After moving once to the L-axis safe area, above the Z-axis target value by a predetermined amount and Y
Since it moves to the axis target value, then to the L axis target value, and then to the Z axis target value, it is possible to prevent the abutment from colliding with the mold during the movement.

According to the back gauge abutting and positioning method of the bending machine of the present invention according to claim 4, the bending program is determined based on the data inputted by the bending condition inputting means, and the back gauge in each step of the step bending is carried out. It is also possible to automatically determine the L-axis direction, Y-axis direction, and Z-axis direction target positions of the butting of. When the target position is different from the current position, it is determined whether the Z-axis target value is higher than the Z-axis current value, and when the Z-axis target value is higher than or equal to the Z-axis current value, the Z-axis target value is higher than the Z-axis target value. Also moves to a position higher by a predetermined amount, then moves to the L-axis and Y-axis target values, and then Z
It moves to the axis target value, but if the Z axis target value is lower than the Z axis current value, the butting collides with the mold when moving to the Z axis target value after moving to the L axis and Y axis target values. Can be prevented. Further, since the avoiding operation in the L-axis direction is not necessary, the abutment can be moved and positioned quickly.

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of a back gauge abutment positioning control device of a bending machine according to the present invention.

FIG. 2 is a flow chart showing an embodiment of the content of collision avoidance based on the L-axis position of the back gauge abutment positioning method of the bending machine according to the present invention.

FIG. 3 is a flow chart showing an embodiment of the content of collision avoidance based on the Z-axis position in the method for abutting and positioning the back gauge of the bending machine according to the present invention.

FIG. 4 is an explanatory diagram showing a movement pattern A for abutting.

FIG. 5 is an explanatory diagram showing a movement pattern B for abutting.

FIG. 6 is an explanatory diagram showing a movement pattern C of butting.

FIG. 7 is an explanatory diagram showing a movement pattern D of abutting.

FIG. 8 is a perspective view and a sectional view showing the structure of a back gauge of the bending machine.

FIG. 9 is a sectional view showing abutting and positioning of a back gauge of a conventional bending machine.

FIG. 10 is a front view showing an abutment and a collision with a die when moving from a low die to a high die.

[Explanation of symbols]

1 Back gauge positioning controller 5 keyboard (bending condition input means) 7 Movement control unit 15 Bending program determination means 17 Abutting position determination means 21 L-axis position determination means 101 back gauge 115 L-axis motor (moving means) 121 Hit 123 Y-axis motor (moving means) 127 Z-axis motor (moving means)

Claims (4)

(57) [Claims] 1. Bending condition input means (5) and bending program determining means (15) for determining a bending program based on data input to this bending condition input means (5).
And a butting position determining means (17) for deciding the target position of the butting of the back gauge in each step based on the data input from the bending condition input means (5), and arranged at appropriate intervals in the Y-axis direction. When abutting is positioned and step bend processing is performed on the plurality of dies (109), the abutting moving means for moving the abutting in the L-axis direction, the Y-axis direction, and the Z-axis direction, and the abutting moving means. A movement control section (7) for controlling the contact moving means to position the contact at the position determined by the contact position determining means (17), and a contact position confirmation means (9) for confirming the current position of the contact. And an L-axis position determining means (21) for determining whether or not the current position of the abutment is in a preset L-axis safety region and transmitting it to the movement control section (7), The current position of the control unit (7) Is in the L-axis safety area, control is performed to move to the final target. However, if the current position of the abutment is not in the L-axis safety area, the movement is once performed in the L-axis safety area and then control is performed to move to the final target. An abutting position control device for a back gauge of a bending machine, which is configured as described above. 2. Bending condition input means (5), and bending program determining means (15) for determining a bending program based on the data input to this bending condition input means (5).
And a butting position determining means (17) for deciding the target position of the butting of the back gauge in each step based on the data input from the bending condition input means (5), and arranged at appropriate intervals in the Y-axis direction. When abutting is positioned and step bend processing is performed on the plurality of dies (109), the abutting moving means for moving the abutting in the L-axis direction, the Y-axis direction, and the Z-axis direction, and the abutting moving means. A movement control section (7) for controlling the abutting movement means to position the abutment at the position determined by the abutment position determining means (17), and the movement control section (7) sets the abutment at the target position. An abutting position control device for a back gauge of a bending machine, wherein the abutting position is controlled so as to pass a position higher by a predetermined amount than a Z-axis target value when the abutting position is moved to. 3. A bending program is determined on the basis of the data input by the bending condition inputting means, and target positions in the L-axis direction, the Y-axis direction, and the Z-axis direction of the back gauge abutting in each step of the step bend machining. If the target position is different from the current position, it is determined whether the current position of the abutment is within the preset L-axis safety region, and if the L-axis value of the current position is within the L-axis safety region. Is a predetermined amount above the Z-axis target value and moves to the Y-axis target value, then to the L-axis target value and then to the Z-axis target value, but the L-axis value at the current position is in the L-axis safety area. If there is not, it is necessary to move to the L-axis safe area, then move a predetermined amount above the Z-axis target value, to the Y-axis target value, then to the L-axis target value, and then to the Z-axis target value. Abutment of the back gauge of the characteristic bending machine Positioning method. 4. A target position in the L-axis direction, the Y-axis direction, and the Z-axis direction of the back gauge abutment in each step of the step bend machining, in which a bending program is determined based on the data input by the bending condition input means. If the target position is different from the current position, it is determined whether the Z-axis target value is higher than the Z-axis current value. If the Z-axis target value is higher than or equal to the Z-axis current value, Z is determined. If the Z-axis target value is lower than the Z-axis current value after moving to a position higher than the axis target value by a predetermined amount, then moving to the L-axis and Y-axis target values and then to the Z-axis target value. Is an abutting and positioning method for a back gauge of a bending machine, characterized by moving to L-axis and Y-axis target values and then to Z-axis target values.