JP2510375Y2 - Bending work imaging device - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) The present invention captures the shape of a bent work piece,
The present invention relates to a bent workpiece imaging device that performs measurement processing.

(Prior Art) A bending machine such as a press brake bends a plate-shaped work interposed between a punch and a die by controlling a relative approach / separation distance between the punch and the die.

However, for example, when the punch as the movable die is moved toward and away from the die as the fixed die, the control position of the drive shaft (depth axis) of the punch greatly affects the bending accuracy. As an example, when the die V width is 6 mm and bending is performed by an air bend of 135 °, if the control position of the depth axis deviates by 0.03 mm, the bending angle causes an error of about 1 °.

Therefore, in such a bending process, a test-bent work or a work processed as a product (hereinafter,
It is especially necessary to measure both (referred to as a folded work together) using an angle measuring jig such as a squarer or protractor, and correct the control position of the depth axis according to the error.
In addition, when measuring the bending work, the size is measured using a scale to adjust the position of the back gauge or to optimize the material size. Etc. are required.

As described above, conventionally, the shape of the bent work is measured using the dimension measuring jig and the angle measuring jig.

Further, with the recent popularization of image processing cameras, an image processing camera is installed in a bending machine to capture an image of the end face shape of the work, and the work during or after the bending work is processed. Bending angles are measured.

(Problems to be Solved by the Invention) However, the above-described method for measuring a bent work has a problem that it takes time because it is a manual work and an individual error occurs in the measurement.

Also, in the angle measuring device fixed to the bending machine,
Only the bending angle can be measured. For example, there is a demand to measure various shape elements and the quantity associated therewith, such as the dimension of the side plate (flange) of the work bent into a V shape and the elongation due to the bending process of the material. I couldn't respond. further,
Since this angle measuring device is intended to image the end face of the work set between the punch and the die and feed the measured angle back to the control device for controlling the depth axis, the work is not always supported freely. However, there is a problem in outputting the measurement angle as it is as the angle of the bent work to various devices.

In view of this, the present invention provides an image of a bent work that is freely supported and is capable of measuring the bending angle, flange size, elongation, and other shape elements and the quantities associated therewith with capacity, speed, and accuracy. An object is to provide an imaging device.

[Structure of the Invention] (Means for Solving the Problem) The present invention has been made in view of the conventional problems as described above, and the invention according to claim 1 is a work for freely supporting a bent work. A support base, an image processing camera that captures a bent shape of a work that is freely supported on the work support base, a relative distance between the work and the image processing camera, and the work and the image. A means for setting a relative height position of the processing camera to a constant value, and an image processing device for inputting an image signal of the work imaged by the image processing camera to obtain a bent shape of the work. In the bent work image pickup device, the work support base has a bottom surface support portion that supports a V-shaped bottom portion of a work piece that is bent into a V shape, and a side plate that gently supports a side surface of the work from the outside. Support section It is intended to be equipped with.

According to a second aspect of the present invention, there is provided a work support base for freely supporting a bent work, an image processing camera for picking up an image of a bent shape of the work freely supported on the work support base, and the work. And a means for setting a relative distance between the image processing camera and a relative height position of the work and the image processing camera to a constant value, and the work imaged by the image processing camera. An image processing device that inputs an image signal and obtains a bent shape of the work, in a bent work imaging device, the image processing camera is arranged in an upward posture, and the work support is
The transparent plate is arranged above the image processing camera.

According to a third aspect of the invention, in the device according to the first or second aspect, the bent work is a work whose end face is bent into a V shape, and the image processing device is configured to detect the detected shape and fold. The configuration is such that the amount of elongation, the side plate length, the shape factor of the bending process such as the bending angle, and the amount associated therewith are calculated from the work shape before the bending process.

A fourth aspect of the invention is the device of the first or second aspect, wherein the image processing device controls the bending machine.
The configuration is connected to an NC device, a database, or a correction value calculation device that calculates a correction value of the bending machine.

(Operation) Since the bent work image pickup device of the present invention has the above-mentioned configuration, the bent work freely supported on the work support table is imaged by the image processing camera, and a force is applied from the image signal. It is possible to obtain the shape of a workpiece that has not been bent. From the work shape, it is possible to calculate shape factors such as flange dimensions and bending angles, and the amount of expansion such as elongation associated with these shape elements.

The folding work and the image processing apparatus are set such that their relative height positions are set and the distance between them is set to be constant in order to obtain a stable image at a fixed magnification.

Also, the image processing camera is arranged in an upward posture,
When the work support base is composed of a transparent plate arranged above the camera, the distance between the camera and the work support base can be made constant, and the work can be easily placed on the work support base. It is possible to easily and accurately capture the shape of the end face of the work that is in contact with the work support table by freely supporting the work.

(Embodiment) In FIGS. 1 and 2 showing an embodiment of the present invention, a work support table for freely supporting a bent work W is provided inside a curtain chamber 1 which optically shields the interior from the surrounding environment. Two are provided. Free support refers to a state in which the work is supported in the form of being suspended in a space so that the work is not distorted by being forcibly applied.

The work support base 2 has a pair of flange support members 3 in which both ends of a tubular member are bent into an L shape and the bent portions are embedded in a foundation, and the horizontal portions of both support members 3 are at the same height. They are arranged parallel to each other so that their longitudinal direction coincides with the imaging direction (the left-right direction in the figure) and both horizontal portions lightly support the outer surface of the flange of the work W. Vertically adjustable ring members 4 are provided on the legs of both support members 3, and between the ring members 4 of the opposite legs of both support members 3, a recess is formed in the upper part of the central portion. The bottom support member 5 is stretched. Therefore, the height position of the bottom support member 5 can be adjusted by the vertical movement of the ring member 4, and the flange portion of the work W is supported by both flange support portions 3 in a state where the bottom portion of the work W is supported by the recessed portion. Can be supported lightly.

On one side of the work support base 2, in a corner of the chamber 1,
An illumination device 6 by a fluorescent lamp as a flat light emitter is provided,
The work W is illuminated.

An image processing (CCD) camera 7 for picking up an end surface of the work W is provided on the other side of the work support 2 so as to be vertically movable. The pin 8 standing near the camera of the work support base 2 is for positioning the imaging end surface position of the work W. Reference numeral 9 indicates the field of view of the camera 7.

With the above-described configuration, the bent work image pickup device of the present example is configured as a transillumination type image pickup device, and the end face shape of the work W freely supported on the work support base 2 is imaged in the visual field 9 by the camera 7. You can

FIG. 3 is a block diagram showing a configuration of an image processing apparatus for inputting an image signal picked up by the camera 7 through an analog-digital (A / D) converter 10 and performing image processing.

As shown in the figure, the image processing apparatus of this example is a system bus.
11 general CPU12, ROM13, RAM14, image memory 15,
Input / output interfaces 16 and 17, digital signal input / output device 1
And an input operation key 19 for the interface 16, a display 20 for the interface 17, and a controller 21 for the digital signal input / output device 18, such as a bending machine, for numerical control. NC device can be connected.

In the image processing apparatus having the above-described configuration, an example of bending a material W ₀ having vertical and horizontal dimensions a and b as shown in FIG. 4 with the side a as the work length as shown in FIG. From the operation keys 19, the material, plate thickness, vertical and horizontal dimensions a, b, etc. are input.

Therefore, as shown in FIG. 1, the work W supported freely is provided.
An image as shown in FIG. 6 can be obtained in the image memory 15 by capturing the image with the image processing camera 7. Therefore, the shape element is obtained by processing this image, and the input operation key
By comparing with the material shape input from 19, it is possible to calculate the quantity associated with the shape element such as elongation, display it on the display 20, and output it to the control device 21.

Examples of the shape factor of the work W include an inner radius r and an outer radius R of the traverse portion, or a measured value related to the end surface strain.

Examples of the quantity associated with the shape element include an elongation obtained by comparing the detected shape and the material size, an error in plate thickness, and the like. As shown in FIG. 6, the elongation amount L _T can be calculated by L _T = (L ₁ + L ₂ ) −b, where the flange lengths are L ₁ and L ₂ .

The calculated shape element and quantity are displayed on the display device 20 mounted on the apparatus as follows, so that the operator can see the information and issue a correction command or the like to the venter controller.

Elongation 0.3 mm Flange L ₁ 23 mm Flange L ₂ 24 mm Angle 90.1 ° Also, when the control device 21 is an NC device, automatic compensation can be applied. When a database is connected instead of the control device 21, the detected data can be organized and saved as data for calculating the correction value.

The embodiment shown in FIG. 7 differs from the embodiment shown in FIG. 1 in that the illumination device 6A is provided on the camera 7 side to provide a reflection system, and a dark curtain 22 is provided on the opposite surface of the work W. The work support base 2A is shown as an example in which the bottom support member 5 is omitted on condition that the work W of this example is extremely lightweight and does not bend.

In this example, since the illumination method is changed from the transmission method to the reflection method, the shape of the bent work W can be obtained in the same manner as in FIG. However, in general, since the end surface of the work is not always flat, the reflected light may have some unevenness, and the detection accuracy is somewhat inferior to that of the transmission method of FIG.

The embodiment shown in FIG. 8 has three cameras 7-1, 7-2, 7-3 in place of the one camera 7 in addition to the one shown in FIG. 1, and as shown in FIG. Each camera 7-1, 7-2, 7-3
Then, the visual fields 23-1, 23-2, and 23-3 are imaged, the imaging results are combined to obtain the shape of the work W shown in FIG. 6, and the shape element and the flow rate associated therewith are calculated. Is.

In this example, since the three cameras 7-1, 7-2, and 7-3 respectively image the V-shaped bottom portion and the flange tip portion, the camera and the imaged position are at the same distance, and the magnification is accurate at each place. Since it is constant, the detection can be performed with higher accuracy.

In the embodiment shown in FIG. 10, the work support is composed of a transparent plate 24 such as tempered glass placed in a horizontal plane.
This is an example in which the bent work W placed with the end face as the imaged surface above is imaged by the image processing camera 7 placed directly below the transparent plate 24. Lighting equipment
6A is shown as an example of the reflection type, but an illumination device may be provided above the transparent plate 24 to adopt the transmission type. Further, although the camera 7 is shown as one example, a plurality of cameras may be used as shown in FIG.

In this example, the distance between the transparent plate 24 and the camera 7 can be reliably kept constant, and free support of the work W can be achieved only by placing it on the transparent plate 24, so that the configuration is simple and highly accurate detection is possible. Has the advantage that it can be performed at high speed.

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

[Advantages of the Invention] As described above, the present invention is an imaging device for a bent work as described in the scope of utility model registration. Therefore, a bent work can be freely supported and its shape can be detected. Therefore, it is possible to calculate the shape element such as the flange size and the bending angle, and it is possible to calculate the quantity required for detecting the shape element.

In addition, the bent work image pickup device of the present invention, in which the bent work is supported on the transparent plate and the image of the end face of the work in contact with the transparent plate is picked up by picking up the image from below, the device configuration is extremely simple. The work can be easily supported, and highly accurate detection can be performed at high speed.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the structure of a bent work image pickup device according to an embodiment of the present invention, FIG. 2 is an explanatory view of the field of view shown in the right side view of FIG. 1, and FIG. 3 is an image processing device. FIG. 4 is a block diagram showing a configuration, FIG. 4 is a perspective view showing an example of a material, FIG. 5 is a perspective view of a bent work showing a state in which the material is bent, and FIG. 6 is an end face shape of the bent work. Explanatory drawing, FIG. 7 is an explanatory view showing another embodiment of the bent work imaging device, FIG. 8 is an explanatory view showing still another example of the bent work imaging device, and FIG.
FIG. 10 is an explanatory view of a field of view of the apparatus, and FIG. 10 is an explanatory view showing a configuration of a bent work imaging device using a transparent plate as a work support. 1 …… Curtain room 2 …… Workpiece support 3 …… Flange support member 5 …… Bottom support member 7 …… CCD camera 15 …… Image memory 24 …… Transparent plate θ …… Bending angle L ₁ , L ₂ … … Flange size W …… Bending work

Claims (4)

(57) [Scope of utility model registration request] 1. A work support table for freely supporting a bent work, an image processing camera for imaging a bent shape of the work freely supported on the work support table, the work and the image processing. Means for setting a relative distance between the work camera and a relative height position of the work and the image processing camera to a constant value, and inputting an image signal of the work picked up by the image processing camera An image processing device for obtaining a bent shape of the work, and a bottom surface support for supporting a V-shaped bottom portion of the work bent into a V shape in the bent work imaging device. A bent work image pickup device comprising: a portion; and a side plate support portion that lightly supports the side surface of the work from the outside. 2. A work support table for freely supporting a bent work, an image processing camera for imaging a bent shape of the work freely supported on the work support table, the work and the image processing. Means for setting a relative distance between the work camera and a relative height position of the work and the image processing camera to a constant value, and inputting an image signal of the work picked up by the image processing camera An image processing device for determining a bent shape of the work, wherein the image processing camera is arranged in an upward posture, and the work support is above the image processing camera. A bent work image pickup device, comprising: a transparent plate disposed on the. 3. The invention according to claim 1 or 2, wherein the bent work is a work whose end face is bent into a V shape, and the image processing device detects the detected shape and the shape before bending. A bent work image pickup device, which is configured to calculate a shape factor of a bending process such as an elongation amount, a side plate length, a bending angle, and an amount thereof in accordance with the work shape. 4. The invention according to claim 1 or 2, wherein the image processing device is connected to an NC device or a database for controlling the bending machine or a correction value calculating device for calculating a correction value of the bending machine. A bent work image pickup device.