JPH08271224A - Method for detecting and aligning rolling direction of rolled metal sheet, and device for aligning the sheet in the rolling direction - Google Patents

Abstract

PURPOSE: To automatically align rolled metal sheets by detecting their rolling direction and accurately aligning the rolled metal sheets with a high accuracy. CONSTITUTION: A laser spot light projection device 2 projects laser spot light to the surface of a rolled metal sheet 1 being placed on a rotary table 10. The laser spot light is scattered by a rolling line formed on the surface of the rolled metal sheet 1 on rolling. The scattered light is reflected by a half mirror 3 and is projected on a translucent screen 4 to form a bright line. The image of the bright line is picked up by a CCD camera 6 through a shooting lens 5 and the direction of the inertial main axis of the above bright line is detected by an image processing device 7. A rotary control device 8 controls a rotary table mechanism 9 of the rotary table 10 so that the angle between the direction of the detected principal axis of inertial and the preset alignment direction of the rolled metal plate 1 become zero.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects the rolling direction of a rolled metal plate when pressing the rolled metal plate to manufacture an inner pot of an electric rice cooker, and always detects the rolling direction. The present invention relates to a rolling direction detecting method, a rolling direction aligning method, and a rolling direction aligning device for aligning rolled metal sheets in a fixed direction.

[0002]

2. Description of the Related Art Generally, the inner pot of an electric rice cooker is manufactured by pressing a rolled metal plate such as aluminum. That is, when manufacturing the inner pot of the electric rice cooker, the metal disk 100 as shown in FIG. 24 is punched out from the aluminum plate, the amount of rice to be cooked, the type of rice such as white rice and rice, and the desired rice contents. After forming the water amount scale 101 corresponding to the above by printing or pressing in advance, the metal disc 100 is pressed to manufacture the inner pot of the electric rice cooker.

By the way, when a rolled metal plate such as an aluminum plate is pressed, the amount of elongation differs between the rolling direction in which the rolled metal plate is rolled and the direction perpendicular to this rolling direction. Therefore, when the metal disc 100 as described above is pressed to manufacture the inner pot of the electric rice cooker, the metal disc 10 is affected by the difference in elongation in the rolling direction due to the press work.
The accuracy of the water amount scale 101 formed at 0 deteriorates.
Therefore, each metal disc 1 punched from the rolled metal plate
It is necessary to print the water amount scale 101 in the state where 00 is aligned with the rolling direction so that the direction of the scale of the water amount scale 101 is always constant with respect to the rolling direction.

Conventionally, in order to align the metal discs 100 punched from a rolled metal plate, an operator visually detects rolling streaks formed on the surface of the metal discs 100 and attempts to print the streaks. The metal disk 100 is always in a fixed direction with respect to the direction of the water amount scale 101.
I was trying to line up.

[0005]

However, at the time of forming the water amount scale 101, it is necessary for an operator to visually detect the rolling streaks and align the metal disc 100 punched from the rolled metal sheet as described above. In the traditional way,
The detection level of the rolling streak varies depending on the fatigue level of each worker, the condition of the worker's body or the inspection environmental conditions such as lighting, and the accuracy of the water amount scale 101 after the press working of the metal disk 100 varies. Amount of water generated 1
There is a problem that the precision of 01 is lowered.

An object of the present invention is to produce a rolled metal sheet based on the scattered light by the rolling streaks of the light projected on the surface of the rolled metal sheet during the production of the rolled metal sheet. It is an object of the present invention to provide a method for detecting a rolling direction of a rolled metal sheet that can easily and reliably detect the rolling direction of the sheet.

Another object of the present invention is to detect the direction of the rolling streaks of the rolled metal sheet on the basis of the scattered light of the rolling streaks of the light projected on the surface of the rolled metal sheet, and based on the detected direction of the rolling streaks. To provide a method for aligning rolled metal sheets in a rolling direction capable of aligning the rolled metal sheets with high accuracy in the same rolling direction.

Another object of the present invention is to detect the rolling direction of the rolled metal sheet based on the scattered light of the light projected onto the surface of the rolled metal sheet due to the rolling streaks and align the detected rolling direction of the rolled metal sheet. It is an object of the present invention to provide a rolling direction aligning device for automatically rolling a rolled metal sheet with high precision.

[0009]

In order to achieve the above object, the invention according to claim 1 projects light from a predetermined direction onto a surface of a rolled metal plate having rolling streaks formed on the surface during rolling, It is characterized in that the intensity distribution of the reflected light scattered by the rolling streaks on the surface of the rolled metal sheet is detected, and the rolling direction of the rolled metal sheet is detected based on the intensity distribution.

In order to achieve the above-mentioned object, the invention according to claim 2 projects light from a predetermined direction onto the surface of a rolled metal sheet having rolling streaks formed on the surface during rolling, and the surface of the rolled metal sheet is projected. The intensity distribution of the reflected light scattered by the rolling stripes is detected, the rolling direction of the rolled metal sheet is detected based on the intensity distribution, and the detected rolling direction matches the predetermined alignment direction. It is characterized in that the rolled metal plate is rotated.

In order to achieve the above object, the invention according to claim 3 is a projection light generating means for projecting light from a predetermined direction onto the surface of a rolled metal plate placed on a rotary table, and the above-mentioned at the time of rolling. Supply from the intensity distribution signal generation means for receiving the reflected light scattered by the rolling stripes formed on the surface of the rolled metal plate and generating the intensity distribution signal corresponding to the intensity distribution of the reflected light, and the intensity distribution signal generation means Image processing means for image-processing the intensity distribution signal to detect an angle between a predetermined alignment direction and a rolling direction of the rolled metal sheet; and a rolling direction detection signal output from the image processing means. Rotation control means of a rotary table mechanism for driving the rotary table such that the angle with respect to the alignment direction becomes zero.

To achieve the above object, the invention according to claim 4 is the invention according to claim 3, wherein the intensity distribution signal generating means forms an image of a bright line based on the scattered light upon incidence of the scattered light. A semi-transparent screen to be formed, and C for capturing an image of the bright line formed on the semi-transparent screen
It is characterized by being composed of a CD camera.

To achieve the above object, the invention according to claim 5 is characterized in that, in the invention according to claim 3 or 4, the projection light generating means projects spot light perpendicularly to the surface of the rolled metal plate. And

To achieve the above object, the invention according to claim 6 is characterized in that, in the invention according to claim 3, the projection light generating means projects spot light onto the surface of the rolled metal plate from an oblique direction. To do.

To achieve the above object, the invention according to claim 7 is the invention according to claim 5 or 6, wherein the intensity distribution signal generating means receives the reflected light and converts it into an electric signal. It is characterized by

In order to achieve the above object, the invention according to claim 8 is characterized in that, in the invention according to claim 7, the line sensor has an annular shape.

To achieve the above object, the invention according to claim 9 is the invention according to claim 3 or 4, wherein the projection light generating means projects slit light in a direction perpendicular to the surface of the rolled metal plate. Characterize.

In order to achieve the above object, the invention according to claim 10 is the invention according to claim 3, wherein the projection light generating means projects the slit light obliquely onto the surface of the rolled metal sheet. Characterize.

[0019]

The reflected light of the light incident on the surface of the rolled metal plate is scattered by the rolling streaks formed on the surface of the rolled metal plate during rolling. The intensity distribution of the reflected light scattered by the rolling stripes is
It has a distribution corresponding to the direction of the rolling streaks of the rolled metal sheet.

The reflected light of the light incident on the surface of the rolled metal sheet is scattered by the rolling stripes formed on the surface of the rolled metal sheet during rolling. The intensity distribution of the reflected light scattered by the rolling streaks has a distribution corresponding to the direction of the rolling streaks of the rolled metal plate. The direction of the rolling streaks of the rolled metal plate is detected from this strength distribution, and the rolled metal plates are aligned with the directions of the rolling streaks aligned.

The intensity distribution signal generating means receives the reflected light of the projected light from the projected light generating means scattered by the rolling streaks formed on the surface of the rolled metal plate during rolling, and from the intensity distribution of the reflected light, the intensity distribution is obtained. Generate a signal. The intensity distribution signal supplied from the intensity distribution generating means is image-processed by the image processing means, and a predetermined angle between the alignment direction of the rolled metal sheet and the rolling direction is detected. The rotary table is controlled so that this angle becomes zero.

The scattered light that is incident on the surface of the rolled metal plate and is scattered by the rolling stripes is incident on the semitransparent screen and forms a bright line as an intensity distribution of the reflected light on the semitransparent screen.

The spot light which is vertically incident on the surface of the rolled metal sheet is scattered in a direction perpendicular to the rolling streaks of the rolled metal sheet.

The spot light incident on the surface of the rolled metal plate from an oblique direction is obliquely emitted while being scattered in a direction perpendicular to the rolling streaks on the surface of the rolled metal plate.

The line sensor outputs an intensity distribution signal corresponding to the one-dimensional intensity distribution of the reflected light which changes according to the rotation of the rolled metal sheet.

The annular line sensor outputs an intensity distribution signal corresponding to a one-dimensional intensity distribution of reflected light which changes in accordance with the angle between the direction of the rolling streaks of the rolled metal sheet and the alignment direction. .

When the slit light is vertically incident on the surface of the rolled metal plate, the area of the bright line due to the reflected light changes corresponding to the angle between the direction of the rolling streaks of the rolled metal plate and the alignment direction.

When the slit light is obliquely incident on the surface of the rolled metal plate, the area of the bright line due to the reflected light changes corresponding to the angle between the direction of the rolling stripes of the rolled metal plate and the alignment direction, and the reflected light Emits at an angle.

[0029]

According to the first aspect of the present invention, the intensity distribution of the reflected light that is incident on the surface of the rolled metal sheet and scattered by the rolling streaks on the surface of the rolled metal sheet is as follows. Since it changes depending on the direction, the rolling direction of the rolled metal sheet can be easily detected from the intensity distribution of the reflected light of the rolled metal sheet.

According to the second aspect of the invention, the intensity distribution of the reflected light that is incident on the surface of the rolled metal sheet and scattered by the rolling streaks on the surface of the rolled metal sheet depends on the direction of the rolling streaks of the rolled metal sheet. Since it changes, the rolling direction of the rolled metal sheet can be detected from the intensity distribution of the reflected light of the rolled metal sheet, and the rolled metal sheet can be easily aligned in the rolling direction.

According to the third aspect of the present invention, the intensity distribution signal supplied from the intensity distribution signal generating means for generating the intensity distribution signal of the reflected light from the surface of the rolled metal sheet is image-processed and predetermined. The angle between the alignment direction of the rolled metal sheets and the rolling direction is detected, and the rotary table is controlled so that the angle between the rolling direction detection signal output from the image processing means and the alignment direction becomes zero. The plates can be automatically aligned with their rolling directions aligned.

According to the invention of claim 4, the reflected light that is incident on the surface of the rolled metal sheet and scattered by the rolling streaks is:
Since the bright line is formed on the semi-transparent screen by entering the semi-transparent screen, the rolling direction of the rolled metal sheet can be easily detected by image-processing the pattern of the bright line.

According to the fifth aspect of the present invention, the spot light which is vertically incident on the surface of the rolled metal sheet is scattered in the direction perpendicular to the rolling streaks of the rolled metal sheet. The rolling direction of the rolled metal sheet can be easily detected from the distribution.

According to the sixth aspect of the invention, the spot light obliquely incident on the surface of the rolled metal plate is obliquely emitted while being scattered perpendicularly to the rolling stripes on the surface of the rolled metal plate. The rolling direction of the rolled metal sheet can be easily detected with a simple configuration without using a half mirror.

According to the invention of claim 7, the line sensor outputs an intensity distribution signal corresponding to a one-dimensional intensity distribution of the reflected light which changes in accordance with the rotation of the rolled metal sheet. The rolling direction of the rolled metal sheet can be easily detected from the distribution signal.

According to the invention of claim 8, from the annular line sensor, the intensity corresponding to the one-dimensional intensity distribution of the reflected light corresponding to the angle between the direction of the rolling streaks of the rolled metal sheet and the alignment direction. Since the distribution signal is output, the current rolling direction of the rolled metal sheet can be easily detected directly from this intensity distribution signal.

According to the invention of claim 9, when the slit light is incident on the surface of the rolled metal sheet, the area of the bright line due to the reflected light becomes the angle between the direction of the rolling streaks of the rolled metal sheet and the alignment direction. Since it changes correspondingly, the rolling direction of the rolled metal sheet can be easily detected from the area of the bright line.

According to the tenth aspect of the invention, when the slit light is obliquely incident on the surface of the rolled metal plate, the reflected light is obliquely emitted, so that the rolled metal is simple in structure without using a half mirror. The rolling direction of the plate can be easily detected.

[0039]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows the configuration of an embodiment of a rolling direction alignment device according to the present invention.

The rolling direction aligning device is the rotary table 1
A laser spot light projecting device 2 for projecting light from the lower side of an aluminum plate 1 as a rolled metal plate placed on the surface of the aluminum plate 1 to the surface of the aluminum plate 1 is provided. The rolling direction aligning device also supports a half mirror 3, a semitransparent screen 4, a CCD camera 6 having a taking lens 5, an image processing device 7, a rotation control device 8 and the rotary table 10, and also performs the rotation. A rotary table mechanism 9 for rotating the rotary table 10 in response to a control signal from the controller 8 is provided.

The laser spot light projecting device 2 has its optical axis set such that the emitted laser spot light is transmitted through the half mirror 3 and then vertically incident on the surface of the aluminum plate 1. The laser spot light incident on the surface of the aluminum plate 1 is, as shown in FIG. 2, scattered light scattered by the rolling streaks (hereinafter, referred to as "grains") 1a formed at the time of manufacturing the aluminum plate 1. (Reflected light) is emitted from the aluminum plate 1. This scattered light is scattered in a plane perpendicular to the running direction A _{1 of the} plate 1a. The scattered light is, as shown in FIG.
After entering the half mirror 3 from the aluminum plate 1 and being reflected, it enters the semitransparent screen 4 and is projected on the semitransparent screen 4 as a bright line having an intensity distribution based on the scattering.

The bright line pattern projected on the semitransparent screen 4 is projected from the taking lens 5 onto the photoelectric conversion surface of the CCD camera 6. The CCD camera converts the bright line projected on the photoelectric conversion surface into a video signal and outputs the video signal to the image processing device 7.

The image processing device 7 is, for example, as shown in FIG. 3, an A / D converter 31 for converting the analog video signal into a digital signal, and the video digitized by the A / D converter 31. A first image memory 32 and a second image memory 33 for respectively storing an odd field and an even field of a signal, a first changeover switch circuit 34, a second changeover switch circuit 35, and binarizing the digitized video signal. A feature point extraction circuit 36 for extracting the feature points of the bright line, a threshold value setting circuit 37 for feature point extraction, a feature point memory 38 for storing the coordinates of the extracted feature points, and a feature point memory 38. Based on the coordinates of the characteristic points, the principal axis of inertia of the bright line pattern is detected, and the predetermined aluminum plate 1 For aligning the direction of the eye 1a comprises a control circuit 41 for controlling the angle judging circuit 39, and each of the above circuits for detecting the angle of the principal axis of inertia.

As shown in FIG. 4, the A / D converter 31 converts the video signal frame-accumulated by the CCD element of the CCD camera 6 at intervals of 1/30 seconds into an 8-bit digital signal, for example. Convert. The first changeover switch circuit 34 responds to the changeover command signal supplied from the control circuit 41 at A / 60 second intervals at 1/60 second intervals corresponding to the odd and even fields of the video signal shown in FIG.
The output of the / D converter 31 is switched between each input of the first image memory 32 and the second image memory 33. The first image memory 32 stores all digital image information of the odd field of the video signal in the entire memory space. Similarly,
The second image memory 33 stores all digital image information of even fields. The second changeover switch circuit 3
Reference numeral 5 denotes 1/1 in synchronization with the switching of the first changeover switch circuit 34 by the changeover command signal supplied from the control circuit 41.
At 60-second intervals, the input of the feature point extraction circuit 36 corresponds to the odd field and the even field of the video signal,
The output of the first image memory 32 and the output of the second image memory 33 are alternately switched.

The feature point extraction circuit 36 reads the 8-bit, 256-gradation digital image information of the odd field stored in the first image memory 32 during the even field period, and determines this digital image information as the threshold value. The threshold value supplied by the value setting circuit 37 is compared. By the comparison, the feature point extraction circuit 36 detects the coordinates of the pixel having the gradation exceeding the threshold value and outputs the coordinate value to the feature point memory 38 and the determination circuit 39. Similarly, during the odd field period, the feature point extraction circuit 3
Reference numeral 6 reads the 8-bit, 256-gradation digital image information of the even field stored in the second image memory 33, and the digital image information and the threshold setting circuit 3 are read.
7. Compare with the threshold value provided by 7. By the comparison, the feature point extraction circuit 36 detects the coordinates of the pixel having the gradation exceeding the threshold value, and outputs the coordinate value to the feature point memory 38 and the determination circuit 39.

During the even field period, the angle determination circuit 39 determines the coordinate value of each feature point of the odd field stored in the feature point memory 38 and each image of the even field output from the feature point extraction circuit 36. The coordinate values of the characteristic points are averaged, and the average value of the coordinate values of the respective characteristic points is calculated, and based on the calculation result, the inertia of the bright line with respect to the predetermined alignment direction of the grain 1a of the aluminum plate 1 is calculated. The angle of the main axis is detected. Also in the odd field period, similarly to the above, the angle determination circuit 39 detects the coordinate value of each feature point of the even field stored in the feature point memory 38 and the odd field output from the feature point extraction circuit 36. The coordinate values of the respective characteristic points are averaged, and the average value of the coordinate values of the respective characteristic points is calculated, and based on the calculation result, the bright line of the bright line with respect to the alignment direction of the predetermined grain 1a of the aluminum plate 1 is calculated. The angle of the principal axis of inertia is detected.

The angle determination circuit 39 also calculates the angles of the main spindle of inertia 10 times in total, for example, five consecutive frames of the video signal, detects the average value thereof, and rotates it as an angle signal of the main spindle of inertia. Output to the control device 8. It should be noted that the number of calculations of the angle of the inertial spindle can be selected according to the required accuracy, but the larger the number of calculations, the longer the calculation time of the angle of the inertial spindle. Therefore, the number of times the angle is calculated is determined by the balance between the processing time after the rolled metal sheets 1 are aligned and the accuracy.

The angle signal is input to the rotation control device 8. The rotation control device 8 drives the rotary table mechanism 9 in accordance with an angle signal corresponding to the angle of the principal axis of inertia of the bright line projected on the semitransparent screen 4 output from the angle determination circuit 39 of the image processing device 7. , The rotary table 10 is rotated.

In such a structure, the rotary table 1
The rolled metal plate 1 is placed on 0, and laser spot light is projected vertically from the laser spot light projecting device 2 onto the surface of the aluminum plate 1. The laser spot light incident on the surface of the aluminum plate 1 exits from the aluminum plate 1 as scattered light scattered by the grain 1a formed during the manufacture of the aluminum plate 1, as described above.
It is displayed on the semi-transparent screen 4 as a bright line due to the above scattering.

The angle determination circuit 39 of the image processing device 7 detects the angle signal corresponding to the angle between the principal axis of inertia of the bright line projected on the semitransparent screen 4 and the preselected alignment direction of the aluminum plate 1. Is detected and output to the rotation control device 8. The rotation control device 8 drives the rotary table mechanism 9 in response to the angle signal to rotate the rotary table 10 by an angle corresponding to the angle signal. Rotating table 10
After the above rotation, the angle of the principal axis of inertia of the bright line displayed on the semitransparent screen 4 is detected again by the image processing device 7,
The rotary table mechanism 9 drives the rotary table 10 according to the detected angle signal. Hereinafter, the same operation is repeated until the angle signal becomes zero. In this way, the aluminum plates 1 can be automatically aligned with high accuracy so that the rolling direction thereof matches the predetermined reference direction without the operator's visual observation.

In the above embodiment, the laser spot light projecting device 2 projects laser spot light obliquely on the surface of the aluminum plate 1, and as shown in FIG. Alternatively, the main axis of inertia of the bright line may be detected. If you do this,
The half mirror 3 in FIG. 1 can be omitted and the optical system can be simplified.

Another embodiment of the present invention is shown in FIGS. In the embodiment shown in FIG. 6, a laser spot light is projected perpendicularly to the surface of the aluminum plate 1 whose rolling direction is to be detected, and scattered by the grain 1a of the aluminum plate 1 as described in FIG. After the light is reflected by the half mirror 3, the specularly reflected light is received by the line sensor 14 arranged so as to be incident on the center, and the signal output from the line sensor 14 is input to the image processing device 7a. It is for detecting the grain 1a of the plate 1.

In the above embodiment, the aluminum plate 1
When the plate 1a of the aluminum plate 1 and the line sensor 14 are orthogonal to each other by rotating as shown by θ, as shown in FIG. 7, the relationship between each pixel of the line sensor 14 and the received light intensity. Is the maximum amount of light received other than the specularly reflected light. On the other hand, when the plate 1a of the aluminum plate 1 and the line sensor 14 are not orthogonal to each other, as shown in FIG. 8, only the regular reflection beam is incident on the pixel at the center of the line sensor 14, The received light intensity of the other pixels is almost zero. Therefore, by detecting the state of FIG. 7 and the state of FIG. 8 from the output of the line sensor 14 by the image processing device 7a, the grain 1a of the aluminum plate 1 is detected.
The direction of can be detected.

Although the aluminum plate 1 is rotated in the above description, the direction of the grain 1a of the aluminum plate 1 can be similarly detected by rotating the line sensor 14. Further, in the above-described embodiment, the laser spot light is incident on the aluminum plate 1 from an oblique direction, and the regular reflection light is received by the central pixel of the line sensor 14 as shown by the solid line in FIG. Similarly, the direction of the grain 1a of the aluminum plate 1 can be detected. With such a configuration, the half mirror 14 as shown in FIG. 6 can be omitted.

In the embodiment shown in FIG. 10, the central pixel of the line sensor 14 in the embodiment described with reference to FIG. 6 is arranged at a position removed from the regular reflection beam from the aluminum plate 1. In this embodiment, when the aluminum plate 1 is rotated in the same manner as in FIG. 6, when the grain 1a of the aluminum plate 1 is parallel to the line sensor 14, as shown in the middle stage of FIG. Light from the grain 1a of the aluminum plate 1 is incident only on the pixel at the center of 14 and the aluminum plate 1 rotates and the grain 1
As a deviates from the position parallel to the line sensor 14, the pixel of the line sensor 14 on which the reflected light is incident changes. Therefore, the direction of the grain 1a of the aluminum plate 1 can be detected by detecting that the output of the line sensor 14 is in the middle state of FIG.
Also in the embodiment of FIG. 10, the line sensor 14 side may be rotated. Also in the above embodiment, the laser spot light is incident on the aluminum plate 1 from an oblique direction, and the line sensor 14 is received at a position deviated from the specular reflection light as shown by a dotted line in FIG. Moreover, the direction of the grain 1a of the aluminum plate 1 can be detected. With such a configuration, the half mirror 14 as shown in FIG. 10 can be omitted.

The embodiment shown in FIG. 12 is similar to the embodiment described with reference to FIG.
Is used. In this line sensor 14a,
The relationship between the pixel and the received light intensity is as shown in FIG. Therefore, in the embodiment of FIG. 12, the direction of the grain 1a of the aluminum plate 1 is detected from the position of the pixel at which the maximum pixel output of the line sensor 14a is obtained without rotating the aluminum plate 1 or the line sensor 14a. can do.

The embodiment shown in FIG. 14 uses a photo sensor 15 instead of the line sensor 14 in the embodiment of FIG. A photoelectric conversion element such as a photodiode or a phototransistor can be used as the photosensor 15. In this embodiment, there is a relationship as shown in FIG. 15 between the maximum output of the photo sensor 15 and the rotation angle θ of the aluminum plate 1, and from this relationship, the direction of the grain 1a of the aluminum plate 1 is changed. I can know.

In the embodiment shown in FIG. 16, slit-shaped light is projected perpendicularly to the surface of the aluminum plate 1 whose rolling direction is to be detected, and the scattered light scattered by the grain 1a of the aluminum plate 1 is halved. The light reflected by the mirror 3 is incident on the surface imaging camera 6a, and the direction of the grain 1a of the aluminum plate 1 is detected from the area of the reflected light on the photoelectric conversion surface of the surface imaging camera 6a. is there. That is, when the aluminum plate 1 is rotated and the area of the reflected light on the photoelectric conversion surface of the surface imaging camera 6a is detected based on the signal output from the surface imaging camera 6a at that time, the slit light causes the aluminum plate 1 to move. Board 1a
17 and 18, the area of the reflected light on the photoelectric conversion surface of the surface imaging camera 6a becomes the minimum and the maximum, respectively, and the rotation of the aluminum plate 1 becomes as follows. A relationship as shown in FIG. 19 is obtained between the corner and the area S. Therefore, the direction of the grain 1a of the aluminum plate 1 can be known from the rotational position of the aluminum plate 1 where the area S is minimized. Further, as shown in FIG. 20, the slit light is incident on the aluminum plate 1 from an oblique direction, and the diametrically opposite light is imaged by the photographing camera 6a, whereby the half mirror can be omitted and the grain can be known.

In the embodiment shown in FIG. 21, spot light is projected on the surface of the aluminum plate 1 from an oblique direction, and two lenses 21 and 22 each having an optical axis which matches the reflection direction of the specular reflection light are spaced from each other. And the rotary slit disk 23 is arranged between the lenses 21 and 22 so that the photosensor 24 detects the reflected light from the aluminum plate 1 condensed by the lens 22. It is a thing. The lens 21 is arranged so that the distance to the incident point P of the spot light on the surface of the aluminum plate 1 is equal to its focal length. The photo sensor 24 is arranged at the focal position of the lens 22 on the optical axis, and the output of the photo sensor 24 is amplified by the amplifier 25.

In the above-described embodiment, when the rotary slit disk 23 shown in FIG. 22 rotates and the reflected light reflected by the grain 1a of the aluminum plate 1 passes through the slits 26, 26, the rotary slit disk 23 shown in FIG. As shown in FIG.
4 has the maximum output, and thus the output of the amplifier 25 has the maximum. Therefore, by rotating the rotary slit disk 23,
From the angle of the rotary slit disc 23 at which the amount of light received by the photosensor 24 becomes maximum, the grain 1a of the aluminum plate 1
The direction of can be detected.

Also in the embodiments of FIGS. 6 to 23 described above, in order to remove an error due to a scratch or the like on the surface of the aluminum plate 1, the aluminum plate 1 or the line sensor 14 is rotated several times respectively. Each aluminum plate by a plurality of measuring devices that collects data in the direction of the grain 1a, moves the aluminum plate 1 or the measuring device, and collects data in the direction of the grain 1a at different positions of the aluminum plate 1. After collecting a plurality of pieces of data of the plate 1a for each aluminum plate 1 by a method of collecting the data in the direction of the plate 1a of No. 1, after the abnormal value is discriminated by the data collected by the computer and removed. It is preferable to perform average calculation.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a rolling direction alignment device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a scattering direction of a laser spot light by a grain of an aluminum plate.

FIG. 3 is a block diagram showing a configuration of an image processing device of the rolling direction alignment device of FIG.

4 is an explanatory diagram of operation timing of the image processing apparatus of FIG.

FIG. 5 is an explanatory diagram of a configuration of an optical system portion of a rolling direction detection device according to another embodiment of the present invention.

FIG. 6 is an explanatory diagram of a configuration of an optical system portion of a rolling direction alignment device according to another embodiment of the present invention.

FIG. 7 is an operation explanatory view of the rolling direction alignment device of FIG. 6.

FIG. 8 is an operation explanatory view of the rolling direction alignment device of FIG. 6.

FIG. 9 is an explanatory diagram of a configuration of an optical system portion of a rolling direction alignment device according to still another embodiment of the present invention.

FIG. 10 is an explanatory diagram of a configuration of an optical system portion of a rolling direction alignment device according to still another embodiment of the present invention.

11 is an operation explanatory view of the rolling direction alignment device of FIG.

FIG. 12 is an explanatory diagram of a configuration of an optical system portion of a rolling direction alignment device according to still another embodiment of the present invention.

FIG. 13 is an operation explanatory view of the rolling direction alignment device of FIG. 12.

FIG. 14 is an explanatory diagram of a configuration of an optical system portion of a rolling direction alignment device according to still another embodiment of the present invention.

15 is an operation explanatory view of the rolling direction alignment device of FIG.

FIG. 16 is an explanatory diagram of a configuration of an optical system portion of a rolling direction alignment device according to still another embodiment of the present invention.

17 is an operation explanatory view of the rolling direction alignment device of FIG.

FIG. 18 is an operation explanatory view of the rolling direction alignment device of FIG. 16.

FIG. 19 is an operation explanatory view of the rolling direction alignment device of FIG. 16.

FIG. 20 is an explanatory diagram for the case of projecting slit light in an oblique direction in the embodiment of FIG.

FIG. 21 is an explanatory diagram of a configuration of an optical system portion of a rolling direction alignment device according to still another embodiment of the present invention.

22 is a plan view of a rotary slit disc used in the rolling direction alignment device of FIG. 21. FIG.

23 is an operation explanatory view of the rolling direction alignment device of FIG.

FIG. 24 is a plan view of a metal disk used for manufacturing the inner pot of the electric rice cooker.

[Explanation of symbols]

 1 Aluminum plate 1a Rolled streaks (plates) 2 Laser spot light projecting device 3 Half mirror 4 Semi-transparent screen 5 Photographing lens 6 CCD camera 6a Surface imaging camera 7 Image processing device 7a Image processing device 8 Rotation control device 9 Rotating table Mechanism 10 Rotary table 11 Rotation control device 14 Line sensor 14a Line sensor 15 Photo sensor 21 Lens 22 Lens 23 Rotating slit disk 24 Photo sensor 25 Amplifier 26 Slit 31 A / D converter 32 First image memory 33 Second image memory 34 1st changeover switch circuit 35 2nd changeover switch circuit 36 Feature point extraction circuit 37 Threshold value setting circuit 38 Feature point memory 39 Angle determination circuit 41 Control circuit 100 Metal disk 101 Water scale

Claims (10)

[Claims] 1. An intensity distribution of reflected light scattered by the rolling streaks on the surface of the rolled metal plate is obtained by projecting light from a predetermined direction onto the surface of the rolled metal plate having rolling streaks formed on the surface during rolling. A method for detecting a rolling direction of a rolled metal sheet, which comprises detecting the rolling direction of the rolled metal sheet based on the strength distribution. 2. The intensity distribution of the reflected light scattered by the rolling streaks on the surface of the rolled metal sheet is projected by projecting light from a predetermined direction onto the surface of the rolled metal sheet having rolling streaks formed on the surface during rolling. Detecting, detecting a rolling direction of the rolled metal sheet based on the strength distribution, and rotating the rolled metal sheet such that the detected rolling direction matches a predetermined alignment direction. Rolling direction alignment method for metal sheets. 3. A projection light generating means for projecting light from a predetermined direction onto the surface of a rolled metal plate placed on a rotary table, and scattering by a rolling line formed on the surface of the rolled metal plate during rolling. The intensity distribution signal generating means for receiving the reflected light thus generated and generating an intensity distribution signal corresponding to the intensity distribution of the reflected light, and the intensity distribution signal supplied from the intensity distribution signal generating means are subjected to image processing and predetermined. Image processing means for detecting the angle between the aligned direction and the rolling direction of the rolled metal sheet, and the angle between the rolling direction detection signal output from the image processing means and the aligned direction becomes zero. A rolling direction aligning device for rolled metal sheets, comprising: a rotation control means of a rotary table mechanism for driving the rotary table. 4. The intensity distribution signal generating means forms a semitransparent screen on which the scattered light is incident to form an image of a bright line based on the scattered light, and an image of the bright line formed on the semitransparent screen. 4. A rolling direction aligning device for rolled metal sheets according to claim 3, further comprising a CCD camera for imaging. 5. The rolling direction aligning device for a rolled metal sheet according to claim 3, wherein said projection light generating means projects a spot light perpendicularly to the surface of the rolled metal sheet. 6. The rolling direction aligning device for a rolled metal sheet according to claim 3, wherein the projection light generating means projects spot light on the surface of the rolled metal sheet from an oblique direction. 7. The rolling direction aligning device for a rolled metal sheet according to claim 5, wherein said intensity distribution signal generating means comprises a line sensor which receives said reflected light and converts it into an electric signal. 8. The rolling direction aligning device for a rolled metal sheet according to claim 7, wherein the line sensor has an annular shape. 9. The rolling direction aligning device for a rolled metal sheet according to claim 3, wherein said projection light generating means projects slit light in a direction perpendicular to the surface of the rolled metal sheet. 10. The rolling direction aligning device for a rolled metal sheet according to claim 3, wherein said projection light generating means projects slit light obliquely onto the surface of the rolled metal sheet.