JPH07241636A - Device for correcting feed length of nc roll feeder - Google Patents

Abstract

PURPOSE:To obtain a feed length with high precision by V comparing and computing by an image processor a reference position of a preset positioning pin hole of a material and a pin hole position at the actual press work to be monitored by a CCD camera, in a device for correcting the feeding length of an NC roll feeder, and correcting the feeding quantity of the material by means of an NC servo controller in the case of deviation other than a prescribed value. CONSTITUTION:A die is provided with a CCD camera 11, which monitors a positioning pin hole position worked on a material 14 that is fed by an NC roll feeder 13, and with a strobe light emitting device 12. The device is constituted of an image processor 18 for determining a deviation by computing and comparing between a positional information, which is image-detected by receiving a feeding completion signal of the encoder 20 of a servo motor 15 from a positioning controller 17, and a positional information of a feed length setter 19, and constituted further of a servo driver 16 for correcting and supplying the material 14 to a press 1 by receiving the correction command P of the positioning controller 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in an apparatus for correcting the feed length of an NC roll feeder for intermittently supplying a plate-shaped material to a press machine.

[0002]

2. Description of the Related Art N for intermittently supplying material to a press machine
The feed amount of the C roll feeder is a semi-closed loop system in which the feed amount is detected from the feed amount setter and the rotation amount of the roller to control the feed amount, or the feeding amount of the material is a measuring roll device provided on the exit side of the NC roll feeder. Positioning is controlled by a full closed loop system that detects and controls the feed amount of the material.

[0003]

In the semi-closed loop method in which the feed amount is detected and controlled from the rotation amount of the roller, the rotation amount of the roller is detected, and the actual length of the material fed is detected. Therefore, if slippage occurs between the roller and the material, the feed amount varies, and a highly accurate feed amount cannot be obtained.

On the other hand, the full closed loop system in which the measuring roll is directly contacted with the material and the feed amount is detected and controlled is more accurate than the control of the semi-closed loop system, but the measuring roll and the material are controlled. If slippage occurs between them, the feed amount cannot be accurately detected, so sufficient precision could not be obtained during work requiring a highly accurate feed amount.

[0005]

An NC roll feeder feed length compensating device according to the present invention is a die attached to a press machine, in which a positioning pin hole of a material is machined in the first stroke, and an NC roll feeder is formed. Is transferred to the next process by N
At the time when the feeding completion signal of the C servo controller is output, the pin hole at the position where the material is transferred is made a still image by a stroboscopic light emitting device, the image is captured by a CCD camera, and the image of the pin hole is made by an image processing device. When the amount of deviation between the position information from the reference position and the reference position set by the reference position setter exceeds a predetermined value, the NC servo controller is instructed of the amount of deviation and the NC roll feeder is driven. Compensate the material feed and get the material feed length with high accuracy.

[0006]

The positioning pin hole of the material processed in the first stroke of the die is transferred to the next stroke by the NC roll feeder. Upon receiving the feed completion signal of the encoder provided on the servo motor shaft for driving the NC roll feeder, the feed completion signal output from the NC servo controller of the NC roll feeder obtains an image of the positioning pin hole portion from the CCD camera. Then, this image is input to the image processing apparatus.

When the amount of deviation of the positioning pin hole from the reference position obtained by the image processing apparatus becomes a predetermined value or more, the deviation amount is fed back to the NC servo controller, and the NC is corrected by the positioning controller. The servo driver of the servomotor for driving the roll feeder corrects the feed length of the material.

Whenever the position of the positioning pin hole processed by the corrected feed length is intermittently supplied to the press machine from the NC roll feeder, the press work is performed while monitoring with the CCD camera and the stroboscopic light emitting device. Is repeated.

When the deviation of the deviation amount from the reference position of the positioning pin hole of the material detected by the image processing device exceeds a predetermined number of times, the deviation amount calculated by the image processing device is sent. The speed command value output from the positioning controller is corrected in consideration of the command value set by the length setter, the servo driver receives the corrected speed command, and the material is fed with the correct feed length. Is intermittently supplied to the press machine.

[0010]

1 and 2 show an embodiment of the present invention. In FIG. 1, when the crankshaft 4 is rotated by the press power transmitted via the flywheel 2 and the clutch / brake 3, the slide 6 having the upper die 8 attached thereto is connected to the connecting rod 5
Reciprocatingly moves, the start command signal generator 10 provided on the crankshaft 4 receives the start command signal, and the NC roll feeder 13 driven by the servomotor 15 intermittently supplies the press machine 1 in the feeding direction X. The material 14 is pressed by the upper die 8 and the lower die 9 attached to the bolster 7.

In order to monitor the position of the positioning pin hole of the pressed material 14, a die attached to the press machine 1 is provided with a CCD camera 11 and a stroboscopic light emitting device 12. Then, upon receiving a material feed completion signal from the encoder 20 provided on the axis of the NC roll feeder driving servo motor 15 from the NC servo controller 17, the positioning pin hole position detected from the camera image and the feed length are set in advance. In order to obtain the deviation amount by performing a comparison calculation with the pin hole reference position set by the device 19, the image processing device 1
8 are provided.

Upon receiving the correction command P from the positioning controller 17, the servo driver 16 of the NC roll feeder driving servomotor 15 correctively supplies the material 14 to the press machine 1.

FIG. 2 shows a flowchart for explaining the operation of the present invention. When the press machine 1 is operated, the feed length set by the feed length setter 19 is driven by the servo motor 15 in response to the start instruction signal from the start instruction signal generator 10 provided on the crankshaft 4. NC roll feeder 1
3 intermittently supplies the material 14 in the feed direction X of the press machine 1, and the material 14 is pressed.

The position of the positioning pin hole of the material 14 processed in the first stroke of the die is transferred to the next stroke by the NC roll feeder 13, and the encoder 20 provided on the axis of the NC roll feeder driving servomotor 15 is used. When the completion of feeding is detected, the shutter of the CCD camera 11 attached to the mold is set to "open" and the strobe light emitting device 12 is turned on to establish a fixed image in the field of view of the camera. This signal is C
It is input to the image processing device 18 as a scanning signal together with the synchronization signal of the CD camera 11, compared with the preset reference position of the positioning pin hole, and fed back to the positioning controller 17 as position information. The shift amount is corrected so that the feed length is obtained, and the press working is repeated while the CCD camera 11 and the stroboscopic light emitting device 12 monitor the position of the positioning pin hole.

Next, the deviation amount from the reference position of the positioning pin hole of the material 14 detected by the image processing device 18 is reproducible in each direction, for example, the feed length is insufficient each time, and press correction is performed. If the number of times exceeds a predetermined number, the position control circuit unit 17A in the positioning controller 17 uses the command value from the feed length setter 19 to adjust the correction value corresponding to the deviation amount. In consideration of the above, the position output unit 17B is configured to minimize the deviation of the feed length.
The speed command is output to the NC roll feeder 13 via the to correct it, and the CCD camera 11 and the strobe light emitting device 12
Pressing is repeated while monitoring the positioning pin hole position at.

[0016]

The feed completion position of the material transferred by the NC roll feeder is detected in a non-contact manner, and the amount of deviation from the preset reference position of the exact feed completion of the material is corrected. Since the operation of the press machine is not stopped due to a feed error, the die life can be improved, the product accuracy can be maintained for a long time, and high productivity can be obtained. The effect is remarkable especially in the case of a thin plate material.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a feed length correction device of an NC roll feeder in the present embodiment.

FIG. 2 is a flowchart illustrating the operation of this embodiment.

[Explanation of symbols]

1 is a press machine, 2 is a flywheel, 3 is a clutch,
Brake, 4 crankshaft, 5 connecting rod, 6 slide, 7 bolster, 8 upper mold, 9 lower mold, 10 start command signal generator, 11 CCD camera, 12 strobe light emitting device, 13 NC roll feeder, 14 is material, 15 is servo motor, 16 is servo driver, 17
Is a positioning servo controller, 17A is a position control circuit unit, 17B is a position output unit, 18 is an image processing device, 19 is a feed length setter, 20 is an encoder, 21 is an NC servo controller, X is a feed direction, and P is a correction. Command.

Claims (2)

[Claims] 1. An NC servo controller for starting a servo motor for driving an NC roll feeder by inputting a start command signal from a start command signal generator for each predetermined crank angle of a crankshaft of a press machine. NC
In the feed length correction device applied to the roll feeder, the position of the CCD camera provided in the die attached to the press machine and the position of the positioning pin hole of the material processed in the first stroke of the die are determined by the NC roll feeder. A stroboscopic light emitting device for stopping the image of the positioning pin hole of the material when it is transferred to the pin hole position of the next step by the CC.
The D camera detects the deviation amount of the preset material from the reference position of the positioning pin hole from the still camera image, and feeds back the deviation amount to the NC servo controller of the NC roll feeder, and the material of the NC roll feeder. An image processing device for correcting the feed amount is provided,
An NC roll feeder feed length correction device. 2. An NC servo controller for starting a servo motor for driving an NC roll feeder by inputting a start command signal from a start command signal generator for each predetermined crank angle of a crankshaft of a press machine. NC
With the feed length correction device applied to the roll feeder, the position of the CCD camera provided on the mold attached to the press machine and the position of the positioning pin hole of the material processed in the first stroke of the mold are
A stroboscopic light emitting device that stops the image of the positioning pin hole of the material when the material is transferred to the pin hole position of the next process by the NC roll feeder, and a reference position of the positioning pin hole of the material set in advance by the CCD camera. An NC roll feeder provided with an image processing device for detecting a deviation amount from the still camera image, feeding back the deviation amount to the NC servo controller of the NC roll feeder, and correcting the material feed amount of the NC roll feeder. When the correction of the deviation amount of the material detected by the image processing device from the reference position of the positioning pin hole in the fixed direction exceeds the specified number of times, the feed length set by the feed length setting device The command value is corrected with a correction value corresponding to the deviation amount, and the NC roll flap is adjusted so that the deviation amount of the feed length is minimized. With a position control circuit section for outputting a speed command to over da, feed length correction device of NC roll feeder, characterized in that.