JPH02280919A - Bending machine - Google Patents

Abstract

PURPOSE:To improve the bending accuracy and to prevent the work flaws from being generated by providing an image pickup means to pick up the image of a marker part equipped in the pressurizing direction of both an upper die and a lower die and a marker position detecting means, detecting the deviation of the dies automatically and correcting the amount of the deviation. CONSTITUTION:When the work W between a punch 13 and a die 9 is bent by the relative motion of both dies, the images of the marker parts 27, 29 provided in the pressurizing direction of both dies are picked up by a visual sensor 17. The position of each marker of the marker parts 27, 29 is detected by an image processor 19 based on this image pickup. When the position of each of detected markers is displayed on a display 23, an operator corrects the deviation of the die manually based on the display. Otherwise, a die deviation correcting actuator is operated to correct the die deviation. Consequently, bad influence by the unbalance load to the frame can be removed.

Description

[Detailed Description of the Invention] (Objective of the Invention) (Industrial Application Field) The present invention relates to a folding machine, and more particularly, the present invention relates to a folding machine having a mold displacement detection function and a mold displacement correction function. Regarding bending machines.

(Prior Art) Conventionally, a workpiece interposed between an upper die and a lower die is bent by moving the two dies relative to each other. Various devices are known as devices for detecting the bending angle when a workpiece is bent. However, when the upper mold and the lower mold are used together, checking for mold misalignment between the two molds relies on the experience and intuition of the operator.

(Problem to be Solved by the Invention) As mentioned above, when bending a workpiece, checking for mold misalignment relies on the experience and skill of the operator, so it is difficult to detect and adjust mold misalignment. very difficult,
Moreover, there is a problem in that it requires considerable effort and time.

In addition, if the mold is misaligned, the bending accuracy will decrease, and the unbalanced load on the frame will have an adverse effect.
There was a problem in that the workpiece was scratched.

The purpose of this invention is to improve the above-mentioned problems by automatically detecting mold misalignment, correcting the detected mold misalignment amount, improving bending accuracy, and preventing scratches on the workpiece. An object of the present invention is to provide a bending machine that prevents this from occurring.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a workpiece interposed between an upper mold and a lower mold by moving the two molds relative to each other. A bending machine that performs a bending process includes a marker section provided in the pressing direction of the upper mold and the lower mold, an imaging means for taking an image of the marker part, and an image taken by the imaging means. A bending machine is provided with marker position detection means for detecting the position of each marker portion.

Further, in the bending machine according to the present invention, the marker position detection means is provided with a function of detecting the position of each marker portion when no pressure is applied and the position of each marker portion when pressure is applied. Furthermore, in the present invention, the bending machine is provided with a display device for displaying each marker position detected by the marker position detection means.

Further, the present invention provides the bending machine, which includes a mold displacement correction means for correcting mold displacement based on each marker position detected by the marker position detection means or each marker position displayed on the display. That's what happens.

(Function) By employing the bending machine of the present invention, when bending a workpiece interposed between an upper mold and a lower mold by moving both molds relative to each other, the imaging device The marker portions provided in the pressurizing direction of both molds are imaged by this. Based on the marker portion imaged by the imaging device, each marker position of the marker portion is detected by the marker position detection device. The position of each marker is detected when no pressure is applied or when pressure is applied.

The detected marker positions are displayed on the display, and the operator manually corrects the mold displacement based on the displayed marker positions. Alternatively, the mold displacement is corrected by automatically operating the mold displacement correction means based on each marker position.

As a result, the bending accuracy is improved, the adverse effects of uneven loads on the frame are eliminated, and the occurrence of scratches on the workpiece is prevented.

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

Referring to FIGS. 9 and 10, for example, a press brake 1 as a bending machine has a C-shape,
The lower frame 3, side frame 5, and upper frame 7 are integrally constructed. The lower frame 3 has a vertically movable ram 11 equipped with a die 9 as a lower mold.
A bunch 13 as an upper mold is provided at the lower part of the upper frame 7 via a bunch holder 15.

The workpiece W interposed between the die 9 and the bunch 13 is bent by the vertical movement of the ram 11.

On the left side of the press brake 1, an IV camera (two visual sensors 17) is installed as an imaging means to image the end face shape of the workpiece W to be bent through the openings of the lower frame 3 and the upper frame 7. It is arranged via a tripod 19.Although omitted in FIG.
A lighting device is provided near the.

The visual sensor 17 is connected to an image processing device 19 to which an image signal captured by the visual sensor 17 is input. The image processing device 19 also includes the image processing device 1
9, an NC device 21 is connected to which a mold displacement detection process is performed and a signal indicating the amount of displacement is inputted, as will be described in detail later. This NC device 21 is attached, for example, to the left side surface of the upper frame 7, and operates, for example, the die 9 by numerical control.

Connected to the image processing device 19 is a display device 23, such as a CRT, which detects and displays the marker positions of the respective marker portions provided on the end face of the die, that is, the punch 13 and the die 9. Said lower frame 3. [No. 10 on the rear side
As shown in the figure, due to the correction signal from the NC device 21,
A mold displacement correction actuator 25 is provided as mold displacement correction means for moving the die 9 in the front-rear direction (left-right direction in FIG. 10).

The visual sensor 17 is placed on the left side of the bending machine 1, and as shown in FIG. The die 9 is installed so that the bottom of the V-groove of the die 9 is located near the center of the visual sensor 17 when the die 9 is installed. Further, as shown in FIG. 7, the bunch 13 and the die 9 are provided with a marker portion (marker line>27.29) in the pressing direction. In this case, any material may be used as long as it can provide a contrast with the molds of the pan f.13 and the die 9, and is not limited thereto.

As shown in FIG. 1, the visual sensor 17 includes:
A monitor television 31 is connected. Further, the image processing device 19 is employed as a marker position detection means, and includes a binarization circuit 33, a frame memory (F/M) 35, a C
It is composed of a PU 37.10M39, a RAM 41, an interface (1/F) 43.45.47, and the like.

A keyboard 49 is connected to the interface 43, the NC device 21 is connected to the interface 45, and the display 23 is connected to the interface 47.

With the above configuration, the video signal from the visual sensor 17 is converted into digital data by the binarization circuit 33 in the image processing device 19, and stored in the frame memory 35 as digital image data. With this image data, for example, the marker position 1.2 of the marker portion 27°29 shown in FIG. ．． 12 etc. are processed by the CPU 37, and the results are output to the display 23 through the interface 47.

Furthermore, the monitor television 31 is used when installing and adjusting the visual sensor 17 (focusing, aperture adjustment).

The keyboard 49 is used to set operations such as precision mold fitting adjustment or mold fitting adjustment.

For example, the marker position 1 of the marker portion 27.29 shown in FIG. , +2 is detected, and the CPU 37 calculates this difference d (
=l+-12) and outputs it to the display 23.

While checking the difference d output on the display 23, the operator manually moves the die 9 to the right in FIG. Furthermore, the direction of adjustment of the die 9 or the bunch 13 can be determined by the sign of the difference d.

In addition, the difference d is output to the NC device 21 via the interface 45, and the NC device 21 outputs a correction signal to the mold deviation correction actuator 25 to operate the mold deviation correction actuator 25, thereby reducing the goo f9. (Fig. 2) It is also possible to automatically move it to the right/j direction in two steps so that d=Q.

Furthermore, in a press brake in which hydraulic pressure is used for the press brake 1, for example, as shown in FIG. 3, each marker position 1. ．． +2 is detected and jJ quasi-position 110.1
20. Therefore, at the start of machining, the NC device 21 outputs a detection command to the image processing device 19, and until the start of machining, the reference position 110.1 is
20 is detected and displayed on the display 23 so that the operator can correct the mold misalignment, or the mold misalignment correction actuator 25 is actuated via the NG'' device 21 to automatically correct the mold misalignment. Corrections can be made.

Furthermore, when a mold pressure signal is generated at the start of pressure application, the marker position 1-12 is detected as shown in FIG.
Marker position 11o when no pressure is applied.

Deviation from 2o ΔI + (=I + -l +o)
, Δ12 (=I 2 - 120) are detected and displayed on the display 23, for example. The operator can check the deviation Δ11. displayed on the display 23. The mold shift can be corrected by manually moving the die 9 while looking at Δ12 so that the deviation Δ11Δ12 becomes Δl+””0*Δ12-O.

In addition, the deviation △11. The value of Δ12 is output to the NC device 21, and a correction signal is output from the NC device 21 to the mold deviation correction actuator 25 to operate the mold deviation correction actuator 25, thereby adjusting the deviation ΔI1. Δ12 is ΔIt=
It is possible to correct the mold misalignment by automatically moving the die 9 so that O, Δ12=0.

The operation of detecting and correcting the mold deviation will be roughly explained with reference to the flowchart shown in FIG. 5 and the timing chart shown in FIG. 6.

In FIG. 5, power is turned on in step S1, and initial settings are made in step S2. In step S3, it is determined whether there is a detection command from the NC device 21 to the image processing device 19. When there is a detection command (in FIG. 6, the detection command is ON), in step S4, the visual sensor 17 images the end faces of the bunch 13 and the die 9, and inputs a video signal to the frame memory 35 in the image processing device 19. do.

In step S5, the image data is taken into the CPU 37, and the marker position 1. , +2 are processed and detected. In step S6, the presence or absence of the mold pressure signal is determined, and if there is no mold pressure signal (in the non-pressure state, as shown in FIG.
), the detected marker position 1 blindness 2 is set as the reference position 110.120 in step S7.

Further, in step S8, the difference d (=lI-12) is calculated, and in step S9, it is displayed on the display 23, and the operator manually corrects the mold shift while looking at the difference d. Alternatively, it is output to the NC device 21, the mold deviation correction actuator 25 is operated to automatically correct the mold deviation, and the process returns to before step S3.

If it is determined in step S6 that there is a mold pressure signal (
In FIG. 6, the mold pressure signal is ON), and in step 810, ΔII (=I+-1+o) at CPLJ37,
Perform arithmetic processing of Δ12 (=12-120),
Roughly step 811'C - Displayed on the display 23, the operator selects Δ11. Δ11=0 manually without looking at Δ12. Δ
Mold misalignment correction is performed so that it becomes 12-O. Alternatively, the output is sent to the NC device 21 and the mold correction actuator 25 is operated to automatically correct the mold deviation in step S.
It will be returned to just before 3.

In this way, when the punch 13 is interposed between the punch 13 and the die 9, and when the bending process is performed by interposing the punch 13 and the die 9, the visual sensor 17 detects the The image of the marker portion 27.29 provided in the pressing direction of the marker portion 27.29 is conveyed by the visual sensor 17.
Marker section 27.29 in image processing device 19 based on 29
Each marker position 1. ．． +2 is detected.

Each detected marker position 11I2 is displayed on the display 23, and the operator manually corrects the mold displacement based on each detected marker position 112. Alternatively, each marker position 1. ．． The mold displacement is corrected by automatically operating the mold displacement correction actuator 25 based on +2. Therefore, it is possible to improve the accuracy of bending, eliminate the adverse effects of the unbalanced load r on the frame, and prevent the workpiece W from being damaged.

It should be noted that the present invention is not limited to the embodiments described above, but can be implemented in other embodiments by making appropriate changes.

[Effect of the Invention j] As can be understood from the above description of the embodiments, according to the present invention, when bending a workpiece, the end faces of both molds are imaged by an imaging means, thereby marking a marker. The position of the marker can be detected. Based on this marker position, mold misalignment can be corrected manually or automatically.

Therefore, it is possible to improve the bending accuracy, eliminate the adverse effects of unbalanced loads on the frame, and prevent the occurrence of scratches on the workpiece.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the main parts according to the present invention, including a configuration I control block diagram of an image processing apparatus, FIGS. 2 and 3. FIG. 4 is an example of a state in which the marker positions of the marker portions provided on the end surfaces of both molds are viewed as m images, FIG. 5 is a flowchart explaining the invention in detail, FIG. 6 is a timing chart, and FIG. , FIG. 8 is an IN view in which marker portions are provided on the end surfaces of both molds, FIG. 9 is a front view of a press brake of an embodiment of the present invention, and FIG. 10 is an X in FIG. 9. −
It is an arrow view along an X-ray. 1...Press brake (bending machine) 9...Die 13...Punch 17...Visual sensor (@image means) 19...Image processing device (bending angle detection means) 21...
・NG device 23...Display 25...Mold deviation correction actuator (mold deviation correction means) Fig. II2 Fig. 3 Fig. 4 Fig. 1...Press brake (bending process II) 9...Die 13... Punch 17... Visual sensor (II-means) 19... Image processing device (bending angle detection means) 21...
・NO device 23--Display device 25--Mold deviation correction actuator (mold deviation correction means) L-key '21 Timing 9 team Fig. 7 Fig. 6 Fig. 8 Fig. 9

Claims (4)

[Claims] (1) A bending machine that bends a workpiece interposed between an upper mold and a lower mold by relative movement of both molds, and pressurizes the upper mold and lower mold. It is characterized by comprising a marker section provided in the direction, an imaging means for taking an image of the marker section, and a marker position detection means for detecting the position of each marker section imaged by the imaging means. A bending machine. (2) In claim (1), the marker position detection means is provided with a function of detecting the position of each marker portion when no pressure is applied and the position of each marker portion when pressure is applied. A bending machine. (3) The bending machine according to any one of claims (1) and (2), further comprising a display that displays each marker position detected by the marker position detection means. (4) In claims (1), (2), and (3), the misalignment of the mold is corrected based on each marker position detected by the marker position detection means or each marker position displayed on the display device. A bending machine characterized by being equipped with a mold misalignment correction means.