JPS59160707A - Device for detecting and controlling bending angle of bending machine - Google Patents

Abstract

PURPOSE:To facilitate installation and to prevent obstruction to an operation by detecting optically the end face of a blank to be subjected to bending, and transmitting the information thereof by an image guide to an image sensor camera. CONSTITUTION:A work 5 is bent between a die 2 installed on a die base 1a and a punch 4 attached to a ram 3. The end face image of the blank 5 detected with an optical head 6 is transmitted by an image guide 7 formed by bundling many fibers to an image sensor camera 8. The image information converted to an electrical signal is then subjected to image processing by an image processor 12 by which a binary coded digital signal is obtd. The signal is then inputted to a central processing unit 13, which calculates the bending angle of the blank 5 from the information stored preliminarily in a memory 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bending angle detection control device for a bending machine that detects all bending angles of a blank material that is bent by the bending machine.

Conventionally, in bending machines such as press brakes, the depth of the punch is determined each time depending on the material and thickness of the blank material to be bent, the bending angle, and the amount of springback. For this reason, it is necessary to adjust the depth of the punch each time each of the above factors changes, which makes the operation complicated, and even if the depth is adjusted to a predetermined value, the depth will change if the oil temperature rises during operation. Therefore, there was a problem that highly accurate bending could not be performed.

This invention was made with the aim of improving this problem, and the bending angle of the bending machine is detected optically via an image guide from a blank material being bent by the bending machine. The present invention provides a device that allows highly accurate bending to be performed without the need for complicated depth adjustment.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.
In the figure, 1 is the bending machine main body, and on the die base 1α,
A die 2 having a V-shaped bending groove 2a on the upper surface is attached, and a punch 4 is attached above the die 2 to a ram 3 that can move up and down by a ram drive mechanism (not shown). The blank 5 can be bent at a predetermined angle between the punch 4 and the die 2. Reference numeral 6 denotes an optical head installed on one end side of the die base 1a, which detects the entire end face of the blank 5 located within the detection area A, and the optical image detected by this optical head 6 is sent to the image sensor. One end of the image guide 7 for transmission to the camera 8 is connected. As shown in Fig. 4, the image guide 7 is made by bundling thousands to tens of thousands of small-diameter fibers 7α made of quartz glass, etc., and fixing both ends of the fibers 7A in a fixed arrangement, making it highly flexible. There is. The other end of the image guide 7 is connected to the image camera 8 and the light source 16, respectively. The light source I6 illuminates the end face of the blank 5 to be detected, and the light emitted from the light source 16 passes through the image guide 7, reaches the optical head 6, and illuminates the end face of the blank 5 within the detection area A. The reflected light from the end face of the blank 5 passes through the entire image guide 7 again and reaches the image sensor camera 8.

The image sensor camera 8 has a large number of photodiodes qa
It has a photodiode array 9 combined in an f-lattice shape, and has a function of receiving reflected light from the blank end face via a condensing lens 10 and converting it into an electrical signal.

The detection signal converted into an electric signal by the image sensor camera 8 is inputted to an image processing device 12 via an interface circuit 11't, and the image processing device 12 converts the analog video signal into an electric signal. is converted into a digital signal and input to the central processing unit 13. The central processing unit 13 calculates the bending angle detected by the optical head 6 based on data stored in advance in the memory 14, and displays the calculated value on a display device.

Note that 17 in the figure is an input/output device that inputs and outputs information to and from the central processing unit 13.

As described in detail above, this invention optically detects the end face of a blank to be bent using an optical head, and all of the optical information is transmitted to the image sensor camera using an image guide. It can be installed at a distance from the bending machine body, so it is not affected by vibration or heat, and only a small diameter optical head needs to be installed near the blank, making it easy to install and does not interfere with work. It rarely happens. Moreover, by using an image guide made of a large number of micro-diameter fibers bundled together, a high-quality detection image can be transmitted to the image sensor camera, making it possible to detect bending angles with high precision. .

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with Fig. 1 being a front view of the folding mechanism, Fig. 2 being a side view, Fig. 3 being a block diagram of the control system, and Fig. 4 being an explanatory diagram of the image guide. be. 1α is the table, 2 is the die, 3 is the ram, 4 is the punch, 5
1 is a workpiece, 6 is an optical head, 7 is an image guide, 8 is an image sensor camera, 12 is an image processing device, 13 is a central processing unit, and 14 is a memory. Applicant Komatsu Ltd. Agent Masaaki Yonehara Patent attorney Tadashi Hamamoto Figure 1

Claims (1)

[Claims] A workpiece 5'f! is formed between the die 2 placed on the die pace 1a and the punch 4 attached to the ram 3. : In a product to be bent, an optical head 6 is provided near the end of the workpiece 5 to detect the end face of the blank 5 located within a preset detection area as an optical image, and the nine blanks detected by the optical head 6 are 5 is transmitted to an image sensor camera 8 through an image guide 7 made of a bundle of many fibers, and the image information converted into an electrical signal by the image sensor camera 8 is image-processed by an image processing device 12. A digitized digital signal is obtained, the obtained binarized digital signal is input to the central processing unit 13, and the bending angle of the blank 5 is calculated from the information stored in the memory 4 in advance. Bending angle detection control device for bending machines.