JP4060480B2 - Press brake butt pad replacement method and press brake - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a press brake abutting pad replacement method and a press brake.
[0002]
[Prior art]
Referring to FIG. 17, in the press brake 101, an abutment 105 of the back gauge device 103 is provided so as to be movable in the front-rear direction (left-right direction in FIG. 16) in order to determine the bending position of the plate material W. Conventionally, when replacing the abutting pad 107 attached to the abutting 105 in accordance with the shape of the bent product, the operator can move between the upper and lower tables 109 and 111 of the press brake 101 and between the upper and lower molds P and D. It is common to exchange by inserting a hand.
[0003]
Alternatively, the operator replaces the abutting pad 107 by causing the tip of the abutting 105 to protrude forward from the upper and lower molds P and D and not moving the upper table 109 or the lower table 111 by an interlock. Has been done.
[0004]
[Problems to be solved by the invention]
However, in the case shown above in the above-described conventional technology, if the upper table 109 or the lower table 111 moves accidentally, the operator's hand is caught and injuries are dangerous. There is.
[0005]
Further, in the case described later in the above-described conventional technique, the entire abutting pad 107 does not come out of the upper and lower molds P and D. Therefore, there is a danger that a hand may be caught when the cylinder 113 malfunctions. Alternatively, the abutting pad 107 may be sandwiched and scattered, or the upper and lower molds P and D may be broken and scattered.
[0006]
The object of the present invention is made by paying attention to the conventional techniques as described above, and the abutting pad can be safely replaced without putting a hand between the molds, and the mold is damaged due to a malfunction. An object of the present invention is to provide an abutting pad changing method for a press brake and a press brake.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the press brake abutment pad exchanging method of the invention according to claim 1 determines the bending position by abutting the front end of the plate material to be bent against the abutment pad. In the press brake abutment pad replacement method that performs bending work in cooperation, the abutment pad should be replaced only when the conditions for ensuring the safety of the preset work are satisfied. , Is characterized by.
[0008]
(1) The operator lowers the upper table on which the punch is mounted to the mute point or the lower limit end, or moves the lower table on which the die is mounted to the mute point or the upper limit end to stop.
(2) A step of moving the abutment to the left and right by the control of the NC device and positioning it at a position where no punch or die is mounted,
(3) A process of locking the upper and lower tables so as not to move by the control of the NC device, and releasing the lock of the abutting pad and making it replaceable.
(4) A process in which the operator replaces the abutting pad from the front where the punch or die is not mounted,
(5) A process in which the operator inputs the end of the abutting pad replacement and locks the abutting pad and then returns to the normal machining state.
[0009]
Therefore, after confirming that the conditions required for work safety are satisfied, the upper table is lowered or the lower table is raised to eliminate the gap for inserting the hand, and the punch or die is mounted. Move the butt to a position where there is no gap, and unlock the butt pad. After the operator inserts a hand through this gap and replaces the abutting pad, the abutting pad is locked to return to the normal machining state.
[0010]
The press brake bump pad replacement method of the invention according to claim 2 is the press brake bump pad replacement method according to claim 1, wherein the position where the bump is positioned in the step (2) mounts the punch. It is a position where it has been confirmed that the punch or die is not attached by a mold detection sensor provided on a die holder for attaching a sensor or die provided on the intermediate plate for To do.
[0011]
Therefore, when positioning the abutment at a position where the punch or die is not mounted, the die detection sensor provided on the intermediate plate for mounting the punch or the die holder for mounting the die is provided. A mold detection sensor detects and positions a position where no punch or die is mounted.
[0012]
According to a third aspect of the present invention, there is provided a press brake bump pad replacement method according to the first aspect of the present invention. In the press brake bump pad replacement method according to the first aspect, the position for positioning the bump in the step (2) is input to the NC device in advance. It is a position where it is confirmed that the punch or die is not mounted on the basis of the information on the attached mold mounting position.
[0013]
Therefore, when positioning the abutment at a position where the punch or die is not mounted, the position where the punch or die is not mounted is determined from the mold mounting position information input in advance to the NC device. .
[0014]
According to a fourth aspect of the present invention, there is provided a press brake abutting pad replacement method in which a bending position is determined by abutting the tip of a plate material to be bent against the abutting pad, and the bending is performed by cooperation of a punch and a die. The abutting pad replacement method is characterized in that the abutting pad is replaced by the following procedure only when various conditions for ensuring the safety of work set in advance are satisfied.
[0015]
(1) The operator lowers the upper table on which the punch is mounted to the mute point or the lower limit end, or moves the lower table on which the die is mounted to the mute point or the upper limit end to stop.
(2) The step of moving the abutment to the left and right ends under the control of the NC device, and the operator opening the side guard that guards the gap of the side plate so that it can be opened and closed from the outside,
(3) A process of locking the upper and lower tables so as not to move by the control of the NC device, and releasing the abutting pad lock so that it can be replaced.
(4) A process in which the operator replaces the abutting pad through the gap in the side plate of the press brake,
(5) A process in which the worker closes the side guard, inputs the end of the abutting pad replacement, locks the abutting pad, and returns to the normal machining state.
[0016]
Therefore, after confirming that the various conditions required from the safety of work are satisfied, the upper table is lowered or the lower table is raised to eliminate the gap for inserting the hand, and the abutment is placed at the left and right ends. Move and open the side guard. After the abutting pad is unlocked and the operator inserts a hand through the gap between the side plates and replaces the abutting pad, the abutting pad is locked to return to the normal processing state.
[0017]
The press brake of the invention according to claim 5 determines the bending position by abutting the tip of the plate material to be bent by the control of the NC device with the abutting pad attached to the abutting, and by the cooperation of the punch and the die. A press brake that performs bending, and includes a die detection sensor provided on an intermediate plate for attaching a punch or a die holder for attaching a die, and the NC device detects a detection signal from the die detection sensor. The abutment is moved to a position where no punch or die is mounted based on the control, and then the abutment pad is unlocked and controlled to be replaceable. .
[0018]
Therefore, by controlling the NC device, the die detection sensor provided on the intermediate plate or the die detection sensor provided on the die holder detects the position where the punch or die is not mounted and there is a gap. Then, the abutment is moved to this position to unlock the abutment pad, and since there is no punch or die, the operator inserts his hand through the vacant gap and replaces the abutment pad.
[0019]
The press brake of the invention according to claim 6 determines the bending position by abutting the tip of the plate material to be bent by the control of the NC device with the abutting pad attached to the abutting, and by the cooperation of the punch and the die. A press brake for performing bending, wherein the NC device includes storage means for storing mold input position information inputted in advance, and based on the mold attachment position information stored in the storage means. After the abutment is moved to a position where no punch or die is mounted, the abutment pad is unlocked and controlled to be replaceable.
[0020]
Therefore, based on the mold mounting position information input in advance to the NC device and stored in the storage means, a position where the punch or die is not mounted and there is a gap is detected, and this position is abutted. It is moved to unlock the abutting pad, and since there is no punch or die, the operator inserts a hand through the vacant gap and replaces the abutting pad.
[0021]
The press brake of the invention according to claim 7 determines the bending position by abutting the tip of the plate material to be bent by the control of the NC device with the abutting pad attached to the abutting, and by the cooperation of the punch and the die A press brake that performs bending, a side guard that can be opened and closed at a gap position between side plates provided on the left and right sides of the press brake, and an open / close sensor provided to detect the opening and closing of the side guard The NC device moves the abutment to both left and right ends, and after confirming that the side guard is opened by a signal from the open / close sensor, unlocks the abutment pad. It is characterized in that it is controlled to be exchangeable from the gap of the side plate.
[0022]
Therefore, the abutment was moved to the left and right ends by the NC device to open the side guard that can be opened and closed at the gap position of the side plate, and the side guard was opened by the open / close sensor provided on this side guard. After confirming, the abutting pad is unlocked, and the operator inserts his hand through the gap of the side plate and replaces the abutting pad.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0024]
1 to 3 show a press brake 1. Since this press brake 1 is already well known, detailed description will be omitted and only the outline will be described.
[0025]
In the press brake 1, a lower table 5 is fixed to the lower part of the front surface (left side in FIG. 3) of the pair of left and right side plates 3, and an upper table 9 is provided on the upper front surface of the side plate 3 by a cylinder 7 so as to be movable up and down. ing.
[0026]
A die D is attached to the upper end portion of the lower table 5 via a die holder 11. A punch P is attached to the lower end portion of the upper table 9 via a plurality of intermediate plates 13.
[0027]
Further, a back gauge device 15 for setting a bending position by abutting a plate material W to be bent is provided behind the die D (right side in FIG. 3). The back gauge device 15 is provided with a stretch 19 movably in the front-rear direction by a pair of left and right L-axis members 17 provided in the front-rear direction. The stretch 19 is provided with a pair of abutments 21 so that the distance can be adjusted. Abutment pads 23 are attached to the abutments 21.
[0028]
An NC device 25 is provided on the upper side of the left side plate 3 in FIG. 1, and its operation panel faces the front, so that an operator can operate from the front of the press brake 1. The NC device 25 performs a desired bending process by controlling the cylinder 7, the back gauge device 15 and the like.
[0029]
With the above configuration, the plate material W to be bent is placed on the die D and positioned by abutting the tip of the plate material W against the abutting pad 23 set at a predetermined position, and the cylinder 7 lowers the upper table 9. The plate material W is bent by the cooperation of the punch P and the die D.
[0030]
Referring to FIG. 4 as well, the die detection sensors 27 and 29 such as proximity switches are respectively provided in the whole or a part of the intermediate plate 13 for attaching the punch P or the die holder 11 for attaching the die D. The mold detection sensor 27 detects whether the punch P is attached to the intermediate plate 13, and the mold detection sensor 29 detects whether the die D is attached to the die holder 11. The signal is transmitted to the NC device 25.
[0031]
With reference to FIGS. 5 and 6, the abutment 21 is provided with an abutment pad 23. The abutting pad 23 is pivotable in the vertical direction by a support pin 31 and a cylinder 33, an actuator 33 such as a solenoid that presses the abutting pad 23 against the support pin 31 and a recess (not shown) provided at one end. However, when the actuator 33 is in the ON state, the abutting pad 23 is locked and cannot be removed.
[0032]
FIG. 7 shows the configuration of the NC device 25. In the NC apparatus 25, an input means 37 such as a keyboard and an output means 39 such as a CRT are connected to a CPU 35 which is a central processing unit. Further, a die detection sensor 27 for detecting whether or not the punch P is attached and a die detection sensor 29 for detecting whether or not the die D is attached are connected.
[0033]
Further, the CPU 35 includes a safety condition determination unit 41 for confirming safety prior to the abutting pad 23 replacement operation, an upper table command unit 43 for commanding the vertical movement of the upper table 9, and movement / positioning of the abutment 21. An abutting movement command unit 45 for commanding, an actuator commanding unit 47 for commanding the actuator 33 for locking the abutting pad 23, and the like are connected.
[0034]
Next, a method for replacing the abutting pad 23 in the press brake 1 described above will be described.
[0035]
In this replacement method, the actuator 33 is operated only when the condition for replacing the abutting pad 23 is satisfied, and the abutting pad 23 can be replaced. When the condition is not satisfied, the abutting pad 23 can be replaced. The pad 23 cannot be removed. Whether or not this condition is satisfied is determined by the safety condition determination unit 41 provided in the NC device 25.
[0036]
As a safety condition for removing the butting pad 23,
(1) The power source of the press brake 1 and the NC device 25 is ON, and the upper table 9 and the back gauge device 15 can be controlled.
[0037]
(2) The replacement of the abutting pad 23 is input from the NC device 25 or the like.
[0038]
(3) When the abutting movement command unit 45 of the NC device 25 is used, the abutting 21 is not attached to the punch P or the die D by the die detection sensors 27 and 29 provided on the intermediate plate 13 or the die holder 11. It is positioned at the confirmed position.
[0039]
(4) The abutment 21 is positioned by the NC device 25 at the foremost position leaving a space for replacing the abutment pad 23.
[0040]
(5) The position of the punch P and the die D is released by the upper table command section 43 of the NC device 25, or the pressure is released after the engagement, or as shown in FIG. Be at the mute point that touches.
[0041]
When the safety condition determination unit 41 determines that the above conditions are satisfied, the abutting pad 23 is replaced by the following procedure.
[0042]
First, in the case of the descending press brake 1, the operator lowers the upper table 9 to the mute point or the lower limit end. Thereby, the space | interval of punch P and die | dye D is narrowed, and it will be in the state which does not enter.
[0043]
The operator inputs replacement of the abutting pad 23 to the NC device 25 from the operation panel. As a result, the NC device 25 controls the back gauge device 15 to advance the abutment 21 so as not to collide with the punch P and the die D.
[0044]
Next, the NC device 25 pushes the abutment 21 to a position where it is confirmed that the punch P or the die D is not mounted by a signal from the mold detection sensors 27 and 29 or a position designated by the operator to the NC device 25. Move. Alternatively, the abutment 21 is moved to a position where it is input that the punch P or the die D is not mounted on the NC device 25 in advance.
[0045]
Alternatively, the abutment 21 can be automatically moved under the control of the NC device 25. In this case, first, a space where the pair of abutting pads 23 can be exchanged together is searched, then the space is searched in the order of the position close to the operation panel of the NC device 25, and the abutting 21 is automatically moved.
[0046]
When the positioning of the abutting pad 21 is completed, even if the foot switch is stepped on, the upper table 9 does not move, and the actuator 33 that locks the abutting pad 23 is released so that the abutting pad 23 can be replaced. The operator replaces the abutting pad 23 from a position where the punch P or the die D is not mounted.
[0047]
When the replacement is completed, the fact that the replacement of the abutting pad 23 is completed is input to the NC device 25. As a result, the abutting pad 23 is locked by the actuator 33, and the upper table 9 can be operated by the foot switch.
[0048]
From the above results, since the gap between the punch P and the die D is closed when the abutting pad 23 is replaced, it is possible to prevent an accident that a hand is inserted and pinched.
[0049]
Further, since the abutting pad 23 is replaced at a position where the punch P or the die D is not mounted, it is possible to prevent the abutting pad 23 and the mold from being damaged even if the upper table 9 is lowered due to an erroneous operation. Can do.
[0050]
Further, since the lock of the abutting pad 23 is not released unless all the conditions for replacing the abutting pad 23 are satisfied, safety can be ensured.
[0051]
In the case where the positioning of the abutment 21 is moved from the die mounting position information previously input to the NC device 25 to a position where the punch P or die D is not mounted, the NC device 25 is shown in FIG. As shown in FIG. 4, instead of eliminating the need for the mold detection sensors 27 and 29, a memory 48 as a storage means is provided.
[0052]
Next, another embodiment according to the present invention will be described.
[0053]
10 to 12 show another press brake 49. In addition, the same code | symbol is attached | subjected to the site | part which is common in the press brake 1 demonstrated in the above-mentioned embodiment, and the overlapping description is abbreviate | omitted.
[0054]
In the press brake 49, side guards 51 are provided on the outer sides of the left and right side plates 3, respectively. In other words, a support plate 53 is attached outward from the side plate 3, and a guard plate 57 is rotatably provided at the tip of the support plate 53 via a hinge 55 (see FIG. 13).
[0055]
Further, referring to FIG. 14, a limit switch 59, which is an example of an open / close sensor, is provided at the position of the hinge 55 so as to detect opening / closing of the guard plate 57. That is, the detection bar 61 of the limit switch 59 is in contact with a disk 63 that supports the guard plate 57 and is pushed in by a projection 65 provided on the disk 63 so as to be turned on or off.
[0056]
Alternatively, as shown in FIG. 15, the detection bar 61 of the limit switch 59 may be turned ON / OFF by fitting into a recess 67 provided in the disk 63. An NC device 69 is provided on the front surface of the press brake 49.
[0057]
Next, FIG. 16 shows the configuration of the NC device 69. Here, parts common to those of the NC device 25 described in the above-described embodiment of the present invention are denoted by common reference numerals.
[0058]
In this NC device 69, an input means 37 such as a keyboard and an output means 39 such as a CRT are connected to the CPU 35 which is a central processing unit, and a limit switch 59 for detecting the opening / closing of the side guard 51 is also connected. . The CPU 35 also includes a safety condition determination unit 41 for confirming safety prior to the abutting pad 23 replacement operation, an upper table command unit 43 for commanding the vertical movement of the upper table 9, and movement / positioning of the abutment 21. An abutting movement command unit 45 for commanding, an actuator commanding unit 47 for commanding the actuator 33 for locking the abutting pad 23, and the like are connected.
[0059]
Next, a method for replacing the abutting pad 23 in the press brake 49 described above will be described.
[0060]
In this replacement method, the actuator 33 is operated only when the condition for replacing the abutting pad 23 is satisfied, and the abutting pad 23 can be replaced. When the condition is not satisfied, the abutting pad 23 can be replaced. The pad 23 cannot be removed.
[0061]
As a condition for removing the butting pad 23,
(1) The power source of the press brake 49 and the NC device 69 is ON, and the upper table 9 and the back gauge device 15 can be controlled.
[0062]
(2) The replacement of the abutting pad 23 is input from the NC device 69 or the like.
[0063]
(3) The abutment 21 is positioned by the NC device 69 at a position closest to the gap G between the side plates 3 on both sides.
[0064]
(4) The abutment 21 is positioned at the foremost position by the NC device 69 while leaving the abutment pad 23 replacement space.
[0065]
(5) The position of the punch P and the die D is released by the NC device 69 after being engaged, or at the mute point where the tip of the punch P contacts the workpiece W as shown in FIG. thing.
[0066]
(6) It has been confirmed that the side guard 51 is opened by a signal from the limit switch 59 provided on the side guard 51 and that the operation from the gap G of the side plate 3 is easy to perform.
[0067]
When the above conditions are satisfied, the abutting pad 23 is replaced by the following procedure.
[0068]
First, in the case of the descending press brake 49, the operator lowers the upper table 9 to the mute point or the lower limit end. Thereby, the space | interval of punch P and die | dye D is narrowed, and it will be in the state which does not enter.
[0069]
The operator inputs the replacement of the abutting pad 23 to the NC device 69 from the operation panel. As a result, the NC device 69 controls the back gauge device 15 to advance the abutment 21 to the extent that it does not collide with the punch P and the die D, and each abutment 21 moves to the left and right end positions.
[0070]
Next, the operator opens the side guard 51. If it is confirmed that the side guard 51 is opened by the limit switch 59 provided on the side guard 51, the upper table 9 will not move even if the foot switch is stepped on, and the actuator 33 that locks the abutting pad 23 is released. Since the abutting pad 23 can be replaced, the operator replaces the abutting pad 23 from the gap G portion of the side plate 3.
[0071]
When the replacement is completed, when the operator closes both side guards 51, the limit switch 59 detects this, the abutting pad 23 is locked by the actuator 33, and the upper table 9 can be operated by the foot switch.
[0072]
From the above results, since the gap between the punch P and the die D is closed when the abutting pad 23 is replaced, it is possible to prevent an accident that a hand is inserted and pinched.
[0073]
Further, since the abutting pad 23 is exchanged from the position of the gap G between the left and right side plates 3, even if the upper table 9 is lowered due to an erroneous operation, the operator's hand is not caught.
[0074]
Further, since the lock of the abutting pad 23 is not released unless all the conditions for replacing the abutting pad 23 are satisfied, safety can be ensured.
[0075]
The present invention is not limited to the embodiment of the invention described above, and can be implemented in other modes by making appropriate modifications. In the present embodiment, the example in which the upper table 9 is moved up and down has been described, but the lower table 5 may be moved up and down.
[0076]
【The invention's effect】
As described above, in the press brake abutting pad replacement method according to the first aspect of the present invention, after confirming that various conditions required for work safety are satisfied, the upper table is lowered or Since the gap for inserting the hand by lifting the lower table is eliminated, safety can be ensured without the operator being caught. Also, move the abutment to a position where there is no punch or die attached and there is a gap, unlock the abutment pad, and an operator inserts a hand through this gap to replace the abutment pad. Therefore, even if the upper table or the lower table malfunctions, it is possible to completely prevent the hand from being caught in the mold.
[0077]
In the press brake abutting pad replacement method according to the second aspect of the present invention, when the abutting is positioned at a position where the punch or die is not mounted, the die detection provided on the intermediate plate for mounting the punch is detected. The mold detection sensor provided on the die holder for mounting the sensor or die detects and positions the position where the punch or die is not mounted, so it is safe at the position where the punch or die is not mounted securely. The butt pad can be replaced.
[0078]
In the press brake abutting pad replacement method according to the invention of claim 3, when positioning the abutting at a position where the punch or die is not mounted, the punch is determined based on the die mounting position information previously input to the NC device. Alternatively, positioning is performed by searching for a position where no die is mounted, so that the abutting pad can be safely replaced at a position where no punch or die is mounted.
[0079]
In the press brake bump pad replacement method according to the fourth aspect of the present invention, after confirming that various conditions required for work safety are satisfied, the upper table is lowered or the lower table is raised. Since the gap for inserting the hand is eliminated, safety can be ensured without the operator being caught. Also, the abutment is moved to the left and right ends, the side guard is opened, the abutment pad is unlocked, and the operator inserts a hand through the gap in the side plate to replace the abutment pad. Even if the lower table malfunctions, it is possible to completely prevent a hand from being caught in the mold.
[0080]
In the press brake according to the fifth aspect of the present invention, the punch or die is not mounted by the mold detection sensor provided on the intermediate plate or the die detection sensor provided on the die holder under the control of the NC device. Detects the position where the vacant position is detected, moves the butt to this position, unlocks the butt pad, and because there is no punch or die, the operator inserts his hand through the vacant gap and replaces the butt pad. Therefore, even if the upper table or the lower table malfunctions, it is possible to completely prevent a hand from being caught in the mold.
[0081]
In the press brake according to the sixth aspect of the present invention, the position where the punch or die is not mounted and the gap is vacant is detected based on the mold mounting position information previously input to the NC device and stored in the storage means. Then, the abutment is moved to this position to unlock the abutment pad, and since there is no punch or die, the operator inserts his hand through the vacant gap and replaces the abutment pad. Even if the lower table malfunctions, it is possible to completely prevent a hand from being caught in the mold.
[0082]
In the press brake according to the seventh aspect of the invention, the abutment is moved to the left and right both ends by the NC device to open the side guard that can be opened and closed at the gap position of the side plate, and the open / close sensor provided on the side guard. After confirming that the side guard has been opened, the abutment pad is unlocked, and the operator inserts his hand through the gap in the side plate and replaces the abutment pad. Even if it operates, it is possible to completely prevent a hand from being caught in the mold.
[Brief description of the drawings]
FIG. 1 is a front view showing a press brake according to the present invention.
FIG. 2 is a sectional view taken along line II-II in FIG.
3 is a side view seen from the direction of line III in FIG. 1. FIG.
FIG. 4 is a cross-sectional view showing a mold detection sensor provided on the intermediate plate and the die holder.
FIG. 5 is an enlarged view showing an abutting pad provided in the abutting.
6 is a sectional view taken along line VI-VI in FIG.
FIG. 7 is a block diagram showing the configuration of the NC device.
FIG. 8 is an explanatory diagram of mute points.
FIG. 9 is a block diagram showing the configuration of the NC device when the abutting position is determined from mold input position information inputted in advance.
FIG. 10 is a front view showing a press brake according to another embodiment of the present invention.
11 is a sectional view taken along line XI-XI in FIG.
12 is a side view seen from the direction of the XII line in FIG.
FIG. 13 is an enlarged view of a hinge portion in the side guard.
FIG. 14 is an enlarged view of a limit switch.
FIG. 15 is an enlarged view of a limit switch.
FIG. 16 is a block diagram showing a configuration of an NC device.
FIG. 17 is an explanatory view showing a conventional abutting pad replacement method.
[Explanation of symbols]
1, 49 Press brake
3 Side plate
5 Lower table
9 Upper table
11 Die holder
13 Intermediate plate
21 Hit
23 butt pad
25, 69 NC unit
27, 29 Mold detection sensor
48 memory (memory means)
51 Side guard
59 Limit switch (open / close sensor)
W board material
P punch
D die
G gap

Claims (7)

The safety of the preset work in the abutment pad replacement method of the press brake that presses the tip of the plate material to be bent against the abutting pad, determines the bending position, and performs the bending process in cooperation with the punch and die The abutting pad replacement method for a press brake, characterized in that the abutting pad is replaced by the following procedure only when various conditions for ensuring the safety are satisfied.
(1) The operator lowers the upper table on which the punch is mounted to the mute point or the lower limit end, or moves the lower table on which the die is mounted to the mute point or the upper limit end to stop.
(2) A step of moving the abutment to the left and right by the control of the NC device and positioning it at a position where no punch or die is mounted,
(3) A process of locking the upper and lower tables so as not to move by the control of the NC device, and releasing the lock of the abutting pad and making it replaceable.
(4) A process in which the operator replaces the abutting pad from the front where the punch or die is not mounted,
(5) A process in which the operator inputs the end of the abutting pad replacement and locks the abutting pad and then returns to the normal machining state. The position for positioning the abutment in the step (2) is determined by the sensor provided on the intermediate plate for mounting the punch or the mold detection sensor provided on the die holder for mounting the die. The press brake abutment pad replacement method according to claim 1, wherein the position is a position where it is confirmed that the die is not mounted. The position for positioning the abutment in the step (2) is a position where it is confirmed that the punch or die is not mounted based on the mold mounting position information input in advance to the NC device. The press brake abutting pad replacement method according to claim 1, wherein: The safety of the preset work in the abutment pad replacement method of the press brake that presses the tip of the plate material to be bent against the abutting pad, determines the bending position, and performs the bending process in cooperation with the punch and die The abutting pad replacement method for a press brake, characterized in that the abutting pad is replaced by the following procedure only when various conditions for ensuring the safety are satisfied.
(1) The operator lowers the upper table on which the punch is mounted to the mute point or the lower limit end, or moves the lower table on which the die is mounted to the mute point or the upper limit end to stop.
(2) The step of moving the abutment to the left and right ends under the control of the NC device, and the operator opening the side guard that guards the gap of the side plate so that it can be opened and closed from the outside,
(3) A process of locking the upper and lower tables so as not to move by the control of the NC device, and releasing the abutting pad lock so that it can be replaced.
(4) A process in which the operator replaces the abutting pad through the gap in the side plate of the press brake,
(5) A process in which the worker closes the side guard, inputs the end of the abutting pad replacement, locks the abutting pad, and returns to the normal machining state. A press brake that determines the bending position by abutting the tip of a plate material to be bent by the control of the NC device with the abutting pad attached to the abutting, and performs the bending by the cooperation of the punch and the die, A die detection sensor provided on an intermediate plate for attaching a punch or a die holder for attaching a die, and the NC device punches or dies the abutment based on a detection signal from the die detection sensor. A press brake, characterized in that, after being moved to a position where the pad is not mounted, the abutting pad is unlocked and controlled to be replaceable. A press brake that determines the bending position by abutting the tip of a plate material to be bent by the control of the NC device with the abutting pad attached to the abutting, and performs the bending by the cooperation of the punch and the die, The NC device includes storage means for storing mold input position information inputted in advance, and the punch or die is mounted on the abutment based on the mold attachment position information stored in the storage means. A press brake, characterized in that, after being moved to a non-position, the abutting pad is controlled to be unlocked and exchangeable. A press brake that determines the bending position by abutting the tip of a plate material to be bent by the control of the NC device with the abutting pad attached to the abutting, and performs the bending by the cooperation of the punch and the die, The NC device includes a side guard that can be freely opened and closed at a gap position of a side plate provided on the left and right sides of the press brake, and an open / close sensor that is provided to detect opening and closing of the side guard. The abutment is moved to both right and left ends, and after confirming that the side guard is opened by a signal from the open / close sensor, the abutment pad is unlocked so that it can be exchanged from the gap of the side plate. A press brake characterized by being controlled.

Images