JPH03174920A - Stopper position arithmetic device for bending machine - Google Patents

Abstract

PURPOSE:To easily achieve the automatic line by extracting calculated stopper position, discriminating the alarm state and correcting the stopper position to dissolve the alarm state. CONSTITUTION:A pair of stopper 5 for the work positioning are set at the stretch 27. The reffered stopper 5 positions are calculated with the arithmetic means on the arbitrary calculating equation in according to the work width. The calculated stopper 5 positions are extracted with the alarm state detecting means and the alarm state is discriminated. For dissolving the alarm state detected with the detecting means, the stopper 5 positions calculated with the stopper position calculating means are corrected with the stopper correcting means. The alarm state is the mutually interfering state of the stoppers and the over travel state generated at the stretch end part. Therefore, that the mutual interference of both stoppers and over-travel can be eliminated.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a stopper position calculation device for a bending machine.

(Prior Art) Generally, a bending machine is provided with a backgauge device, and a workpiece positioned by the backgauge device is subjected to a predetermined bending process. Specifically, the backgauge device has a stretch that moves back and forth with respect to the bending mold by a servo positioning device, and a pair of stoppers that are fixed at arbitrary positions on the stretch, and that are fixed on the stretch at appropriate intervals. The workpiece is positioned by abutting one end of the workpiece against the stopper.

Furthermore, in recent years, with the advancement of automation systems, the stopper on the stretch can be freely positioned in the left and right direction on the toss rich using a servo positioning device, and the stopper is automatically moved according to the width of the workpiece to be machined. It's starting to look like this.

In this case, the stopper can be positioned at a position specified by the bending program, for example, and the effort for setting the stopper position can be saved, and an automated line can be achieved.

However, if there is an error in the manual data, problems such as interference between stoppers or overtravel may occur.

Once a problem occurs, it is necessary to return to the origin and restart the process, which poses a risk of equipment damage and requires a lot of effort to restart, making it difficult to achieve an automated line.

(Problems to be Solved by the Invention) As mentioned above, in conventional bending machines, if there is an error in the command value for stretching the stopper, trouble will occur, and many countermeasures have been taken to solve the problem. There was a problem in that it was time-consuming and difficult to achieve an automated line.

Therefore, the present invention relates to a stopper that is automatically positioned on a stretch that moves back and forth with respect to a bending die, and provides a stopper position calculation device for a bending machine that can automatically calculate the stopper position without causing trouble. The purpose is to provide.

[Structure of the Invention] (Means for Solving the Problems) The present invention for solving the above problems provides a bending die with a stretch that moves back and forth, and one end of the workpiece coming from the direction of the die is attached to the stretch. A stopper position calculating device for a bending machine is provided with a pair of stoppers that abut against each other at certain positions, and a stopper driving means that positions these stoppers at arbitrary positions in the left and right direction along the stretch. stopper position calculation means for calculating the basic stopper position using an arbitrary calculation formula according to the
alarm state detection means for extracting the calculated stopper position and determining the alarm state; and stopper position correction means for correcting the stopper position calculated by the stopper position calculation means in order to eliminate the alarm state detected by the detection means. It is characterized by having the following.

(Function) The stopper position calculation device for a bending machine of the present invention detects alarm conditions such as interference between stoppers and overtravel conditions with respect to the stopper position calculated in advance by an arbitrary calculation formula, and measures to eliminate these alarm conditions. The position of each toss collar on the stretch is corrected.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

First, the back gauge device will be explained.

In FIG. 2, a press brake 1 as an example of a bending machine is configured such that a flashing die, which is a lower mold, approaches a fixed flashing punch, which is an upper mold, and then descends. This is a type of bending machine that performs bending by separating.

The part indicated by the solid line in the figure is the back gauge device 3, which feeds a workpiece such as a plate material onto the die from the front, and abuts one end of the workpiece against a plurality of stoppers (positioning members) 5 to place the desired workpiece of the plate material. Bending is performed after the processing position is aligned with the bending line formed by the downwardly protruding tip of the punch and the bottom of the V-shaped groove of the die.

A plurality of supports 9 protruding rearward are fixed near the left and right ends of the die holder 7, and each of the supports 9 includes a lead screw driven by a servo motor M and a linear motion guide 15 parallel to the lead screw. ing.

The above lead screw and linear motion guide 1
5, there is a movable base 17 on which a vertical cylindrical body as a vertical column is fixed, and a servo motor M is mounted on the movable base 17.
Due to the rotational drive of L, the movable base 17 and eventually the stopper 5
can be positioned in any desired forward or backward position.

A spiral 21 is machined on the outer periphery of the vertical cylindrical body 19, and a part of the moving body is connected via a radial ball bearing 25 held between two annular nuts 23 which are screwed together with the spiral 21 and whose position can be adjusted up and down. A stretch 27 forming the structure is attached so as to be swingable. This swinging is done to prevent excessive force from being applied to the stretch 27.

A rack 29 is provided in front of the stretch 27. The stretch 27 is also provided with a pair of stopper devices 31 that are movable along the rack 29. The stopper device 31 includes a servo motor M that allows movement along the rack 29, and a servo motor Mz that allows the stopper 5 to be driven up and down.

Therefore, both stoppers 5 are movable in the longitudinal direction (L-axis direction) by driving the servo motor ML, are movable in the vertical direction (Z-axis direction) by driving the motor Mz, and are movable in the vertical direction (Z-axis direction) by driving the motor Mz. The left and right direction (
It is movable in the Y-axis direction).

However, as understood from the figure, each stopper device 31
has a predetermined size in the left and right direction.

Therefore, the parameter P1 that defines the approachable distance between the two
17 is set. Further, the movable area of each stopper device 31 in the horizontal and positional directions is set by parameters P118 (right position) and P119 (left position) as soft limit positions, and is managed on software.

FIG. 3 shows the planar arrangement of the back gauge device 3. FIG. 4 is an explanatory diagram when processing is performed by shifting the work center Wc with respect to the machine center Mc.

In FIG. 4, when the work center We is shifted with respect to the machine center Mc, the offset ff1B P
As a numerical value.

In addition, in Fig. 3, the Y-axis coordinate is machine center Mc.
The (zero) point is positive (+) to the right and negative (-) to the left, and the center of each stopper 5 is located inside by a distance Y' from the end of the workpiece W. It is basic. That is, in this example, for a work W having a width B, the stopper positions YR of both stoppers 5 are calculated by the following equation.

FIG. 1 shows a block diagram of a calculation device that calculates the stopper positions YL and YR, detects an alarm state based on the calculated stopper positions, and changes the position to a position where the alarm can be resolved. In this example, it is assumed that this arithmetic device is incorporated in an NC device.

In FIG. 1, this calculation device includes a bending data setting section 33 that sets bending data from a bending program or manual human power data, and a bending data setting section 33 that sets bending data from a bending program or manual human power data, and a bending data setting section 33 that sets bending data from a bending program or manual human power data, and a bending data setting section 33 that sets bending data from a bending program or manual human power data, and the above equation (
) From (2), the strike/soba position YL of both strikes/sonoku 5
, YR is provided.

In addition, three alarm state detection units are provided to check the calculated stopper positions Y t and Y R using the values stored in the parameter storage unit 37. A stopper position correction section 41 is provided that corrects the stopper position using the stored value so that the alarm condition can be resolved. The value corrected by the correction section 41 is set in the stopper drive section 43 of the NC device.

FIG. 5 shows a method for correcting the stopper position.

In step 501, the basic stopper positions YL and YR are determined using the equation (+) (2) as described above.

Next, in step 502, it is determined that YL-YRl<-P117, and it is determined whether or not both stoppers 5 interfere.

If it is determined that interference will occur if this continues, the process moves to step 503, and a new stopper position is calculated using the following equation to prevent both stoppers 5 from interfering with each other, centering on the work center WC.

(Hereinafter, blank space) P 117 YL -BP--1,0... (3) This formula divides the interference distance by half (P117)/2 to the left and right, centering on the work center Wc, and further calculates 1. They are moved away by Qmm. This prevents both stoppers 5 from interfering with each other.

Next, in step 504, it is determined whether or not the left stopper 5 has exceeded the left soft overtravel position P119, and if it has, the process moves to step 505.

In step 505, the stopper 5 is moved inward from the overtravel position (P119) using the following equation.

YL-P119+1.0...(5
) Next, in step 506, it is determined whether or not the two stoppers 5 newly interfere with each other in step 505, and if they do, the process moves to step 507 and the right stopper 5 is set relative to the left stopper 5 using the following formula. , set at a distance that does not interfere (P117).

YR-YL + P 117...
(6) The processing in steps 508 to 511 is performed in step 50.
Similarly to steps 4 to 507, the process for the right overtravel position at (P118) is executed with the right stopper 5 as a reference.

As described above, in the process of this example, the basic position is calculated in step 501, interference between both stoppers is determined in step 502, overtravel is determined in steps 504 and 508, and steps 503.505 to 507.50
In steps 9 to 511, a new stopper position correction calculation that can eliminate interference and overtravel is performed.

Therefore, in this example, the position of the stopper 5 with respect to the stretch 27 is automatically calculated, and a new position is calculated so that the stoppers do not interfere with each other or overtravel.

In the embodiment shown above, the stopper position calculation unit 35 calculates (
+), Although an example was shown in which the stopper positions YL and YR are calculated using equation (2), the stopper positions YL and Y.

The same holds true even if the value is calculated and input by another calculation device.

Further, in the above embodiment, an example is shown in which the arithmetic unit is incorporated into the NC device, but it goes without saying that it can be configured separately from the NC device.

The present invention is not limited to the above-mentioned embodiments, but can be implemented in any appropriate manner by making appropriate design changes.

[Effects of the Invention] As described above, the present invention optimizes the calculation method in a stopper position calculation device for a bending machine that is provided with a pair of stoppers that can be freely positioned on a stretch that moves back and forth with respect to a bending die. This eliminates the possibility of reovertravel in which both stoppers interfere with each other, making it easier to implement an automated line.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a stopper position calculation device according to an embodiment of the present invention, FIG. 2 is a perspective view of a back gauge device used in the embodiment of the present invention, and FIG. 3 is a layout relationship of the above-mentioned back gauge device. FIG. 4 is an explanatory plan view showing the machine center and work center, and FIG. 5 is a flowchart showing the correction calculation method for eliminating the alarm. 3... Bark gauge device 5... Stopper 31... Stopper device MY... Servo motor

Claims (2)

[Claims] (1) Provide a stretch that moves back and forth with respect to the bending die, and provide a pair of stoppers on this stretch to abut and position one end of the workpiece coming from the direction of the die at two positions, and connect these stoppers to the stretcher. In a stopper position calculation device for a bending machine, which is equipped with a stopper drive means that positions the stopper at an arbitrary position in the horizontal direction along means, an alarm state detection means for extracting the calculated stopper position and determining the alarm state, and a stopper for correcting the stopper position calculated by the stopper position calculation means to eliminate the alarm state detected by the detection means. A stopper position calculation device for a bending machine, characterized by comprising position correction means. (2) The bending machine according to claim 1, wherein the alarm condition detected by the stopper position correction means is a mutual interference condition of the stoppers and an overtravel condition occurring at the stretch end. Machine stopper position calculation device.