JP6920222B2 - Mold presence detection method and press brake - Google Patents

Description

The present invention relates to a press brake in which upper and lower tables having a mold mounting portion long in the left-right direction are provided so as to face each other in the vertical direction. More specifically, the present invention relates to a mold presence / absence detection method for detecting whether or not a mold is present in a mold mounting portion on the upper and lower tables, and a press brake used in the above method.

The press brake that bends the plate-shaped work is provided so that one of the upper and lower tables provided facing the upper and lower sides can be moved up and down as a ram. Then, after positioning the plate-shaped work between the upper and lower dies mounted on the mold mounting portions of the upper and lower tables, the work is sandwiched between the upper and lower dies to bend the work in a V shape. It has been.

The attachment / detachment / replacement of the upper and lower molds with respect to the upper and lower mold mounting portions is automatically performed by using an automatic mold exchange device (ATC) (see, for example, Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 2000-71028 Japanese Unexamined Patent Publication No. 2014-91137

According to the configurations described in Patent Documents 1 and 2, it is possible to automatically attach / detach and replace the mold with respect to the mold mounting portions provided on the upper and lower tables in the press brake. However, if the mold is forgotten to be removed from the mold mounting portion, the mold holding member that holds the mold in the automatic mold changing device (ATC) may come into contact with the forgotten mold and cause damage. , There is a problem. In addition, when molds are mounted at multiple locations on the upper and lower tables and only the molds at the desired positions are attached / detached / replaced at the place where step bending is performed, the already mounted molds and ATC may interfere with each other. be.

The present invention has been made in view of the above-mentioned problems, and is a mold presence / absence detection method for detecting the presence / absence of a mold for a press brake provided with upper and lower tables provided with a mold mounting portion facing each other. ,
An ATC for attaching / detaching and exchanging the mold to the left-right mold mounting portion provided on the table is provided so as to be movable in the left-right direction, and the mold holding member in this ATC is a mold mounted on the mold mounting portion. It is held in an interfering state and moves in the left-right direction, and when the ATC moves in the left-right direction, it is detected that the mold holding member has come into contact with the mold, and the presence or absence of the mold with respect to the mold mounting portion is determined. It is to detect.

Further, the press brake used in the mold presence / absence detection method.
Upper and lower tables with mold mounting parts,
ATC that can move back and forth between the mold storage part and the upper and lower mold mounting parts so that the molds can be attached and detached with respect to the upper and lower mold mounting parts.
In ATC, the mold holding member is held in a state of interfering with the mold mounted on the mold mounting portion, and when the mold holding member moves in the left-right direction along the mold mounting portion, the mold holding member presses the mold. Mold contact detection means for detecting contact with the mold,
It has.

According to the present invention, when the dies are attached / detached / exchanged to / from the upper and lower tables of the press brake, the ATC determines in advance whether or not the dies are left behind in the dies. Can be detected. Therefore, it is possible to prevent the ATC from coming into contact with the left-behind mold at the time of mold replacement, and it is possible to solve the conventional problems as described above.

It is a front explanatory view which roughly showed the overall structure of the press brake which concerns on embodiment of this invention. It is a side explanatory view which shows the main part of a press brake. It is a functional block diagram. It is a flowchart. It is an operation explanatory view of the mold presence / absence detection operation in the configuration which provided ATC on both the left and right sides.

Hereinafter, the configuration of the press brake according to the embodiment of the present invention will be described with reference to the drawings. The press brake provided with the automatic die changing device (ATC) for the upper and lower dies is described in Patent Documents 1 and 2. As you can see, it is already a well-known configuration. Therefore, for ease of understanding, the overall configuration will be outlined.

With reference to FIGS. 1 and 2, the press brake 1 includes left and right side frames 3L and 3R. The left and right sides of the upper table 5 are supported on the upper portions of the side frames 3L and 3R. Further, on the lower side of the side frames 3L and 3R, a lower table 7 facing the upper table 5 vertically is provided. The lower table 7 constitutes a kind of ram, and is configured to be moved up and down by an elevating operation device (not shown) such as a hydraulic cylinder or a servomotor.

At the lower part of the upper table 5, a mold mounting portion (upper mold mounting portion) 9 to which the upper mold P can be attached and detached is formed long in the left-right direction (X-axis direction). A mold mounting portion (lower mold mounting portion) 11 to which the lower mold D can be attached and detached is formed long in the left-right direction on the upper portion of the lower table 7. Then, on the rear side (rear side in the Y-axis direction) of the upper table 5, the mold can be relatively movable between the mold mounting portion 9 and the mold storage portion (upper mold storage portion) 13. An automatic mold changing device (ATC) 15 that can be exchanged is provided so as to be movable in the left-right direction.

Further, on the rear side of the lower table 7, ATC19 which is relatively movable between the mold mounting portion 11 and the mold storage portion (lower mold storage portion) 17 and whose mold can be exchanged moves in the left-right direction. It is provided freely.

The upper and lower ATCs 15 and 19 are for attaching and detaching and exchanging the upper and lower molds P and D, respectively, and the mold holding member 21 can be engaged with the engaging holes PH and DH provided in the upper and lower molds P and D, respectively. Are provided for each. As is well known, the mold holding member 21 is provided so as to be able to advance and retreat with respect to the molds P and D mounted on the mold mounting portions 9 and 11. Then, when the molds P and D are held by inserting them into the engaging holes PH and DH provided in the upper and lower molds P and D mounted on the mold mounting portions 9 and 11, the molds P and D are moved forward in a horizontal state. It is held in.

The operation of moving the ATCs 15 and 19 in the left-right direction and the operation of attaching and detaching the molds P and D between the mold mounting portions 9 and 11 and the mold storage portions 13 and 17 are described in, for example, the above-mentioned patent document. As described in 1, it is already well known. Therefore, detailed description of the operation of ATC will be omitted.

By the way, when new molds P and D are mounted on the upper and lower mold mounting portions 9 and 11 by ATC, the molds that are not removed or the molds that are not removed are forgotten on the mold mounting portions 9 and 11. If there is a mold, the ATC may come into contact with the mold that was forgotten to be removed and be damaged.

Therefore, in the present embodiment, when the new molds P and D are mounted on the mold mounting portions 9 and 11, whether or not there is a mold forgotten to be removed in the mold mounting portions 9 and 11. It performs an operation to detect whether or not. Therefore, in the press brake 1 according to the present embodiment, when the dies are exchanged by the ATCs 15 and 19, the die exchange operation control device 23 (see FIG. 3) that controls the die exchange operation of the ATCs 15 and 19 is used. It is equipped.

The mold exchange operation control device 23 is composed of, for example, a computer, and includes a CPU, RAM, and ROM. The control device 23 is provided with an input means 25. Further, the control device 23 is provided with a machining program memory 27 for storing the machining program input from the input means 25. Further, the control device 23 is provided with a machining program analysis means 29 for analyzing the machining program. The machining program analysis means 29 has a function of analyzing a machining program and determining a mold mounting position on which the mold should be mounted on the mold to be used and the mold mounting portions 9 and 11.

Further, in order to confirm whether or not there is a mold for which the control device 23 has forgotten to be removed, a confirmation operation for moving the ATCs 15 and 19 in the left-right direction along the mold mounting portions 9 and 11 is performed. A confirmation operation program memory 31 that stores the confirmation operation program is provided.

Further, in the confirmation operation, when the ATCs 15 and 19 come into contact with the molds P and D, the contact detecting means 33 for detecting the contact is connected to the control device 23. The collision detecting means 33 includes a configuration for detecting load fluctuations (torque changes) of, for example, a servomotor (not shown) for moving the ATCs 15 and 19 in the left-right direction, and a rotary encoder provided in the servomotor. Various configurations can be adopted, such as a configuration for detecting the stop of pulse generation, or a configuration in which the mold holding member 21 of the ATCs 15 and 19 is provided with an acceleration sensor to detect a collision.

Further, a contact position detecting means 35 for detecting the contact position when the ATCs 15 and 19 come into contact with the molds P and D is connected to the control device 23. The contact position detecting means 35 can be, for example, a position detecting means provided in a servomotor, for example, a rotary encoder for moving the ATCs 15 and 19 in the left-right direction.

Further, the control device 23 is connected to the mold information reading means 37 provided at appropriate positions of the ATCs 15 and 19. When the ATCs 15 and 19 come into contact with the molds P and D, the mold information reading means 37 is provided with, for example, an ID tag, an IC chip, or a mold P. It has a function of reading a mold identification information holding means such as a QR code (registered trademark) described in D. Therefore, when the ATCs 15 and 19 come into contact with the molds P and D left without being removed from the mold mounting portions 9 and 11, the information of the molds P and D left behind is input to the control device 23. Become.

Therefore, based on the input mold information, from the mold information stored in the mold information memory 39, the mold types, shapes, dimensions, and engagement holes PH of the molds P and D that are left behind, DH position information and the like can be read. The mold type, shape, dimensions, and position information of the engaging holes PH and DH are stored in advance in the mold identification information provided in the mold identification information holding means such as the ID tag provided in the molds P and D. If so, the mold information memory 39 can be omitted.

The control device 23 is provided with a mold unloading operation program memory 41. The mold unloading operation program memory 41 stores a program for unloading the left-behind molds P and D to the mold storage units 13 and 17 by the ATCs 15 and 19. Therefore, when the left-behind molds P and D exist, the molds P and D are carried out according to the program stored in the mold carry-out operation program memory 41.

Further, a servomotor driver 43 that controls the operation of the servomotors provided in the ATCs 15 and 19 is connected to the control device 23.

Now, in the above configuration, when the machining program is input from the input means 25 (step S1), the machining program is stored in the machining program memory 27. When the machining program is stored in the machining program memory 27, the machining program is analyzed by the program analysis means 29 (step S2). Then, the molds P and D to be used (that is, the molds P and D to be mounted on the mold mounting portions 9 and 11) are read out from the machining program (step S3), and the molds P and D for the mold mounting portions 9 and 11 are read. The mounting position of D is read out (step S4).

When the mounting positions of the molds P and D are read, a confirmation operation of whether or not the molds P and D are present at the mounting positions is performed (step S5). This confirmation operation is performed according to a program stored in advance in the confirmation operation program memory 31. That is, a state in which the mold holding members 21 in the upper and lower ATCs 15 and 19 hold the molds P and D (a state in which they interfere with the molds P and D mounted on the mold mounting portions 9 and 11), that is, a horizontal shape. Is held in (step S6).

Then, in the upper and lower mold mounting portions 9 and 11, ATCs 15 and 19 are set from outside the mold arrangement area where the molds P and D are arranged (the above-mentioned torque change detection and ATC15, 19 preset in the confirmation operation program). It moves in the left-right direction (at an appropriate movement speed in consideration of the influence of the coasting amount of the vehicle) (step S7). Then, it is detected whether or not the mold holding member 21 has come into contact with the molds P and D (step S8). Here, in the case of NO, it is determined whether or not the mold has passed the mold placement area (area to be mounted on the mold) in which the molds P and D are placed (step S9).

If NO in step S9, the process returns to step S8. If YES in step S9, it is determined in step S10 that there is no mold. Then, in step S11, a mounting operation for mounting the new molds P and D is executed.

If YES in step S8, the positions where the mold holding members 21 in the upper and lower ATCs 15 and 19 are in contact with the molds P and D are detected (step S12). As described above, when the mold holding member 21 comes into contact with the molds P and D, the information reading means 37 provided in the ATCs 15 and 19 identifies the molds provided in the molds P and D, for example, an ID tag. The information holding means is read (step S13).

When the mold identification information holding means is read, the positions of the engaging holes PH and DH in the abutting molds P and D are read (step S14). Then, the contacting molds P and D are carried out by the mold carrying-out operation stored in the mold carrying-out operation program memory 41 (step S15). That is, the mold holding members 21 provided in the ATCs 15 and 19 are engaged with the engaging holes PH and DH in the abutted molds P and D (step S16). Then, the molds P and D are removed from the mold mounting portions 9 and 11, and the molds are carried out to the mold storage portions 13 and 17. After that, the process returns to step S5 again, and an operation of confirming whether or not there is a mold left behind is performed.

As can be understood from the above description, when a machining program is input to the control device 23 in order to bend the plate-shaped work W, the gold used for the upper and lower tables 5 and 7 is used. Before newly mounting the molds P and D, it is confirmed whether or not there is a mold at the position where the molds P and D should be newly mounted on the mold mounting portions 9 and 11 on the upper and lower tables 5 and 7. Will be done. Therefore, when the molds P and D to be used are arranged by the ATCs 15 and 19 with respect to the mounting position (arrangement position), the ATCs 15 and 19 do not come into contact (collision) with the left-behind molds. ..

By the way, the present invention is not limited to the above-described embodiment, and can be implemented in other embodiments by making appropriate changes.

That is, in the above description, it is confirmed whether or not the molds P and D are left behind at the positions where the molds P and D should be mounted (positions where they should be arranged) with respect to the upper and lower mold mounting portions 9 and 11. I explained that I would do it. However, regardless of the mold arrangement position, it is also possible to confirm the presence or absence of the molds P and D over the entire upper and lower mold mounting portions 9 and 11. In this case, as shown in FIG. 1, the ATCs 15 and 19 located outside one end (the left end in FIG. 1) of the upper and lower mold mounting portions 9 and 11 are attached to the mold mounting portions 9 and 11. This can be done by moving to the other end. The operation of confirming the presence or absence of the molds on the upper and lower mold mounting portions 9 and 11 may be performed simultaneously on the upper and lower sides or separately on the upper and lower sides.

By the way, as schematically shown in FIG. 5, in a configuration in which the upper and lower ATCs 15 and 19 are provided on the left and right respectively, it is desirable to perform as follows. That is, the pair of left and right ATCs 15L, 15R, 19L, and 19R are positioned in advance at the reference positions shown in FIG. 5 (A), respectively. The reference position is not limited to the right side shown in FIG. 5A, but may be the left side. In FIG. 5A, the lower ATC19L and 19R are located on the right side (outside) of the upper ATC15L and 15R, so that the lower mold mounting portion 11 can be easily cleaned.

In order to detect the presence or absence of the molds P and D of the upper and lower mold mounting portions 9 and 11, the mold holding member 21 of one of the ATCs 15L and 19L is retracted to a position where it does not interfere with the molds P and D. Then, it moves to the start position (the position shown in FIG. 5B) away from the reference position. After that, the mold holding members 21 in each of the ATCs 15L, 15R, 19L, and 19R hold the molds P and D so as to interfere with the molds P and D mounted on the mold mounting portions 9 and 11. Hold in (almost horizontal state). Then, the left and right ATCs 15L, 15R, 19L, and 19R are moved so as to approach each other, and the presence or absence of the molds P and D of the mold mounting portions 9 and 11 is confirmed. As a result, the mold mounted on the mold mounting portions 9 and 11 can be quickly detected.

If the molds P and D are mounted on the mold mounting portions 9 and 11 without being removed, they are newly mounted in the mold mounting area (mold placement area). A confirmation operation for confirming the presence or absence of molds P and D is performed from outside the adjacent area.

After that, the mold holding member 21 in each ATC15L, 15R, 19L, 19R is returned to a state where it does not interfere with the molds P, D, and each ATC15L, 15R, 19L, 19R is placed in the initial state position (FIG. 5 (FIG. 5). Return to the position shown in A)).

As described above, in the configuration provided with ATC15L, 15R, 19L, 19R on both the left and right sides, the molds can be exchanged simultaneously or separately by the left and right ATCs15L, 15R, 19L, 19R, and the molds can be exchanged. The molds P and D can be efficiently attached to and detached from the mounting portions 9 and 11. In addition, the presence or absence of the mold can be detected more quickly in the mold mounting portions 9 and 11.

When the upper and lower mold mounting portions 9 and 11 detect the molds P and D over the entire area where the molds P and D can be arranged, the upper and lower ATCs 15L, 15R and 19L, 19R Can be moved to a position outside the left and right ends of the upper and lower mold mounting portions 9 and 11 (the position of the imaginary line shown in FIG. 15C).

By the way, in the above description, it has been described that the presence / absence of the molds P and D is detected by the mold holding member 21 coming into contact with the molds P and D. However, as a configuration for detecting the presence or absence of the molds P and D of the mold mounting portions 9 and 11, it is also possible to provide a contact member separate from the mold holding member 21 so as to be able to advance and retreat. It is also possible to detect the presence or absence of the molds P and D by irradiating the molds P and D with inspection light from the ATCs 15 and 19 and detecting the reflected light.

Further, as described in, for example, Japanese Patent Application Laid-Open No. 2009-131910, the work transfer robot provided on the front side of the press brake so as to be movable and positioned in the left-right direction is mounted on the mold mounting portions 9 and 11. It is provided with a contact member capable of contacting the upper and lower molds P and D. Then, when the work transfer robot moves in the left-right direction, it may be detected that the contact member has come into contact with the upper and lower molds P and D mounted on the mold mounting portions 9 and 11. It is possible.

1 Press brake 5 Upper table 7 Lower table 9 Mold mounting part (upper mold mounting part)
11 Mold mounting part (lower mold mounting part)
15,19 ATC
21 Mold holding member 23 Mold exchange operation control device 27 Machining program memory 29 Machining program analysis means 31 Confirmation operation program memory 33 Contact detection means 35 Contact position detection means 37 Mold information reading means 39 Mold information memory 41 Mold Die unloading operation program memory P Upper type D Lower type PH, DH Engagement hole

Claims (9)

This is a mold presence / absence detection method for detecting the presence / absence of a mold for a press brake provided with upper and lower tables having a mold mounting portion facing each other.
An ATC for attaching / detaching and exchanging the mold to the left-right mold mounting portion provided on the table is provided so as to be movable in the left-right direction, and the mold holding member in this ATC is a mold mounted on the mold mounting portion. It is held in an interfering state and moves in the left-right direction, and when the ATC moves in the left-right direction, it is detected that the mold holding member has come into contact with the mold, and the presence or absence of the mold with respect to the mold mounting portion is determined. A mold presence / absence detection method characterized by detection. The mold presence / absence detection method according to claim 1, wherein the presence / absence of a mold is detected simultaneously or individually for the mold mounting portions on the upper and lower tables. The mold presence / absence detection method according to claim 1 or 2, wherein the ATC is moved in the left-right direction from outside the mold presence / absence detection area where the mold is placed on the table. .. The mold presence / absence detection method according to claim 3, wherein the outside of the mold presence / absence detection area includes outer regions on both left and right ends that can be mounted on the mold mounting portion. In the mold presence / absence detection method according to any one of claims 1 to 4, a pair of left and right ATCs are provided on the upper and lower ATCs, and the left and right ATCs are individually moved in the left-right direction to detect the presence / absence of a mold. A mold presence / absence detection method characterized by. In the mold presence / absence detection method according to any one of claims 1 to 5, when the mold holding member in the ATC comes into contact with the mold, the position information in the left-right direction of the ATC is read and the contacted mold The mold information is read, and based on the read position information and the mold information, the mold holding member in the abutted ATC is engaged with the engaging hole provided in the mold, and the mold is mounted from the mold mounting portion. A mold presence / absence detection method characterized in that the mold is removed and carried out to the mold storage unit. A press brake used in the mold presence / absence detection method according to any one of claims 1 to 6.
Upper and lower tables with mold mounting parts,
ATC that can move back and forth between the mold storage part and the upper and lower mold mounting parts so that the molds can be attached and detached with respect to the upper and lower mold mounting parts.
In ATC, the mold holding member is held in a state of interfering with the mold mounted on the mold mounting portion, and when the mold holding member moves in the left-right direction along the mold mounting portion, the mold holding member presses the mold. Mold contact detection means for detecting contact with the mold,
A press brake characterized by being equipped with. The press brake according to claim 7, wherein the ATC is provided with an identification information reading means for reading the mold identification information provided in the mold. In the press brake according to claim 8, in order to control an operation of removing the mold from the mold mounting portion and transporting the mold to the mold storage portion based on the mold identification information read by the identification information reading means. A press brake characterized by being equipped with a die unloading operation control means.

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