JP2007285983A - Method and device for detecting damage or the like of workpiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detector of damages or the like of a workpiece, capable of certainly detecting damages or dents produced in the end surface of an endless thin-walled workpiece, such as power transmission belt or the like. <P>SOLUTION: The detector is constituted so as to detect the damage or dent formed to the respective end surfaces Wa of a plurality of endless thin-walled workpieces W such as power transmission belt or the like, superimposed one upon another in a close contact state and comprising an inspection stand 1 for rotating a plurality of the endless thin-walled workpieces W superimposed one upon another in a state that the end surfaces Wa faces upward, a pair of the light sources 5 and 6 installed above the inspection stand 1 in a facing relation and irradiating the end surfaces Wa with a yellow light 2 and a blue light 3 mutually set for complementary color relation to form a detection region 4, a camera 7 for photographing the detection region 4 formed by the light sources 5 and 6 from the part, immediately above the detection region 4 and a monitor 8 for processing the image photographed by the camera 7 to display the same. Damages or dents formed to each of the end surfaces Wa are detected from the degree of adhesion or concentration change of the color in the detection region 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method and apparatus for detecting a flaw, etc., of a workpiece for detecting a flaw or a dent on an end face of an endless thin workpiece such as a power transmission belt.

  Conventionally, as a method for detecting scratches and dents on the end face of an endless metal belt such as a power transmission belt of an automobile, the endless metal belt is fixed to a rotating disk one by one and rotated at a constant speed in a fixed direction. The white light is irradiated onto the end face, the end face illuminated with the white light is captured by the camera, the image captured by the camera is enlarged and displayed on the monitor, and the worker becomes a shadow from the image displayed on the monitor. A method for detecting the presence or absence of a flaw by confirming a darkened portion is known.

  Also, as a method for detecting scratches on the mirror surface of the workpiece, light is emitted by irradiating blue light entirely from above the workpiece and further irradiating yellow light partially from a certain direction. There is known a method for detecting a scratch by irradiating a color with a so-called color contrast and a complementary color relationship, in which the scratch is yellow or blue or a mixture of both colors appears white due to irregular reflection of (for example, Patent Document 1).

  Furthermore, as a method for detecting scratches on the workpiece surface, the workpiece is irradiated with light of a different color from the opposite position, and the irradiated portion is imaged from the optical axis direction of one light, and there is no scratch on the workpiece. In this case, a mixed color of different lights is detected, and if there is a scratch, the color of one of the lights is detected. 2).

Japanese Patent Laid-Open No. 61-284647 JP-A-6-82389

  However, in the method in which the endless metal belt is fixed to the rotating disk one by one and the end surface is irradiated with white light from a certain direction while rotating at a constant speed, the irradiation light is white. Depending on the sheath shape, the shadow portion becomes smaller or thinner, which may make it difficult for the operator to recognize the scratches or dents.

  In addition, in the method of irradiating blue light from the upper part of the work as a whole, and further irradiating the scratched part with yellow light from a certain direction, the work is remarkably color-coded in the case of a relatively deep flaw. The person can also be judged as a wound, but in the case of a relatively shallow wound, the blue color is irradiated on average, so the part that becomes white, which is a fusion color of two complementary colors, or the part far from the yellow light source is blue However, even though there was a flaw, the whole was bluish, and there was a problem that it was difficult to judge it as a flaw and it could be overlooked.

  Furthermore, in the method of irradiating the workpiece with light of different colors from the opposite position and imaging the irradiated part from the optical axis direction of one light, an imaging camera is installed on one of the light sources. Therefore, there was a problem that the depth of the wound could not be recognized.

  The present invention has been made in view of such problems of the prior art, and the object of the present invention is to ensure that scratches and dents generated on the end face of an endless thin workpiece such as a power transmission belt are reliably obtained. It is an object of the present invention to provide a method and apparatus for detecting a workpiece scratch or the like that can be detected.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a method for detecting scratches and dents on each end face in a state where a plurality of endless thin workpieces are brought into close contact with each other, and the plurality of sheets are stacked. While rotating the endless thin workpiece, each of the end faces is irradiated with light having a complementary color from opposite positions above the end face to form a detection area, and this detection area is imaged from directly above to determine the color adhesion condition. And scratches and dents generated on the respective end faces from color density changes.

  According to a second aspect of the present invention, in the method for detecting a flaw or the like of the workpiece according to the first aspect, black is a color of a gap formed between the endless thin workpieces stacked in plural, and is complementary to the irradiated color 2 It was made to detect the appearance of the color and the white color, which is a fusion color of these two colors, and how it changed.

  According to a third aspect of the present invention, in the method for detecting a flaw or the like of the workpiece according to the first or second aspect, the shape such as the depth and size of the flaw generated on each of the end faces is obtained by viewing an image on which an operator has performed image processing. To be visually recognized.

  The invention according to claim 4 is an apparatus for detecting scratches and dents generated on each end face in a state where a plurality of endless thin workpieces are closely stacked and stacked, with the end faces facing upward. An inspection table for rotating the stacked endless thin workpieces, a pair of light sources that are installed facing the upper side of the inspection table and that irradiate the complementary surfaces with each other to form a detection region, and these light sources A camera that captures the detection area to be formed from directly above, and a monitor that processes and displays the image captured by the camera, and scratches that have occurred on each end surface due to color adhesion and color density change in the detection area And dents are detected.

  According to the first aspect of the present invention, the detection area is formed by irradiating the end surface of the endless thin workpiece with two colors of light having complementary colors, and when the scratch or dent is present in the detection area, the detection area In the vicinity of the center of the light source, the color is white, which is a fusion color of two complementary colors, and the area close to each light source has a color that is different from the light color of the light source where there are concave scratches or dents. In addition, since the color of the light of the light source is displayed in a region close to each light source in a place where the convex scratch exists, the scratch is easy to detect. Moreover, since the endless thin workpiece is inspected in a state where a plurality of sheets are stacked at a time, work efficiency is good.

  According to the second aspect of the invention, the black color that is the color of the gap formed between the endless thin workpieces that are stacked on top of each other highlights the two colors that are complementary and the white color that is a fusion color of these two colors. Therefore, the visibility with respect to a crack improves.

  According to the invention according to claim 3, since the shape of the scratch such as the depth and size of the scratch generated on the end face is determined by looking at the image processed image, the presence / absence of the scratch is surely confirmed without being overlooked. The shape can be visually recognized.

  According to the invention of claim 4, since the detection region formed by irradiating light having complementary colors is imaged from directly above, the shape of the wound such as the depth and size of the wound can be accurately detected, The result can be reflected in the processing conditions of the endless thin workpiece.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a schematic configuration diagram of a workpiece flaw detection device according to the present invention, FIG. 2 is a schematic diagram of a power transmission belt, and FIG.

  As shown in FIG. 1, an inspection table 1 for rotating an endless power transmission belt W in which a plurality of sheets are stacked with an end face Wa facing upward, as shown in FIG. A pair of light sources 5 and 6 which are installed facing the upper side of the inspection table 1 and irradiate light 2 and 3 having complementary colors to form a detection region 4, and a detection region 4 formed by these light sources 5 and 6. And a monitor 8 that processes and displays an image captured by the camera 7. Here, the two colors of light having a complementary color relationship are yellow light 2 and blue light 3. Note that wiring is omitted.

  The inspection table 1 is composed of a disk portion 10 into which twelve stacked power transmission belts W are fitted, and a drive unit (not shown) that rotates the disk portion 10 at a desired rotational speed. The detection region 4 is formed in a region where each end face of the twelve stacked power transmission belts W rotated by the inspection table 1 passes and is irradiated with both the yellow light 2 and the blue light 3 equally. The light emitted from the light source 5 is yellow light 2, and the light emitted from the light source 6 is blue light 3, both of which are applied to the detection region 4 at a predetermined angle.

  The camera 7 is installed in the middle of the light source 5 and the light source 6 and images the entire detection region 4 from directly above the detection region 4. The camera 7 can image the end surface Wa of the entire circumference by rotating the 12 power transmission belts W rotated by the inspection table 1, and can repeatedly image the end surface Wa of the entire periphery if necessary. The image captured by the camera 7 is image-processed by the monitor 8, and the operator can recognize the presence / absence of the scratch and the shape of the scratch by observing the desired end face Wa with the enlarged still image.

  Further, as shown in FIG. 2A, the endless power transmission belt W is fitted to the disk portion 10 of the inspection table 1 in a state where 12 end faces Wa are stacked upward. Since twelve sheets are stacked, a gap Wb is formed on the contact surface between the power transmission belts W. FIG. 2B shows the power transmission belt W in which an end Wa has a circular and concave deep scar C1 or a concave shallow scar C2.

The operation of the workpiece flaw detection apparatus according to the present invention configured as described above and the workpiece flaw detection method according to the present invention.
First, when the end portion Wa of the power transmission belt W is not damaged, as shown in FIG. 3, the central portion 4a of the detection region 4 where the yellow light 2 and the blue light 3 are equivalent has a complementary color relationship. The yellow light 2 and the blue light 3 are fused to give a white color. Moreover, the area | region 4b close | similar to the light source 5 among the detection areas 4 exhibits yellow, and the area | region 4c close | similar to the light source 6 exhibits blue. The portions 11 and 12 of the power transmission belt W outside the detection area 4 exhibit the original color of the power transmission belt W.

  Next, when the end Wa of the power transmission belt W has a circular and concave deep scar C1, the yellow light 2 and the blue light 3 are equivalent as shown in FIG. The central portion 4a exhibits a white color by the fusion of the yellow light 2 and the blue light 3 having a complementary color relationship including the concave deep scratch C1. Further, the portion C1a close to the light source 5 in the concave deep scratch C1 exhibits blue, and the portion C1b close to the light source 6 in the concave deep scratch C1 exhibits yellow. The other areas 4b and 4c have the same color as when there is no scratch. Accordingly, it is possible to accurately detect the shape of the scratch C1, such as the depth and size of the scratch C1.

  In addition, when the end Wa of the power transmission belt W has a circular and shallow shallow scar C2, as shown in FIG. 5, the color density of the portion having the concave shallow scratch C2 has a concave deep scratch. Thinner than C1. Of the concave shallow scratch C2, the portion C2a close to the light source 5 exhibits blue, and among the concave shallow scratch C2, the portion C2b close to the light source 6 exhibits yellow. The other regions 4a, 4b, 4c are the same as in the case of the concave deep scratch C1. Accordingly, it is possible to accurately detect the shape of the scratch C2, such as the depth and size of the scratch C2.

  In any case, a gap Wb is formed on the contact surface between the power transmission belts W in order to detect the scratches C1 and C2 on the end faces Wa with the twelve power transmission belts W stacked. Since the gap Wb is picked up as black, yellow and blue, which are complementary colors, and white, which is a fusion color of these two colors, are highlighted, which helps improve the visibility of the scratches C1 and C2. In the embodiment of the present invention, the inspection is performed in a state where 12 power transmission belts W are stacked, but the number of stacked power transmission belts W is arbitrary and is not particularly limited.

  According to the present invention, when the end surface of the endless thin workpiece is irradiated with light of two colors having a complementary color relationship to form a detection area, and when a scratch or dent is present in the detection area, the vicinity of the center of the detection area Presents a white color that is a fusion color of two colors that are complementary to each other, and presents a color different from the light color of the light source in a region close to each light source where there are concave scratches or dents. It is possible to provide a method and apparatus for detecting a scratch on a workpiece that can easily detect scratches and dents on an end surface of an endless thin workpiece such as a power transmission belt.

Schematic configuration diagram of a workpiece flaw detection device according to the present invention BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram of a power transmission belt, (a) is a top view of the power transmission belt piled up in multiple sheets, (b) is sectional drawing of a power transmission belt with a concave crack. It is operation explanatory drawing, (a) is a schematic diagram of the power transmission belt and the device when there is no scratch, (b) is an image when there is no scratch It is operation | movement explanatory drawing, (a) is a schematic diagram of a power transmission belt and an apparatus when there is a concave deep scratch, (b) is an image of a concave deep scratch It is operation | movement explanatory drawing, (a) is a schematic diagram of a power transmission belt and an apparatus when there is a concave shallow scratch, and (b) is an image of a concave shallow scratch.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Inspection table, 2 ... Yellow light, 3 ... Blue light, 4 ... Detection area | region, 5, 6 ... Light source, 7 ... Camera, 8 ... Monitor, W ... Power transmission belt (endless thin work), Wa ... End surface , Wb ... gap.

Claims (4)

A method of detecting scratches and dents on each end face in a state where a plurality of endless thin workpieces are closely attached and facing each other above the end face while rotating the endless thin workpieces stacked on each other. The detection areas are formed by irradiating the end faces with light that is complementary to each other from the position where they are positioned, and this detection area is imaged from directly above, and scratches or strikes caused on the end faces due to color adhesion or color density changes. A method for detecting a scratch or the like on a workpiece, characterized by detecting a mark. Detects the appearance or change of black, which is the color of the gap formed between the endless thin workpieces that are stacked on top of each other, the two colors that are complementary to each other and the white color that is a fusion of these two colors. A method for detecting a flaw or the like on a workpiece according to claim 1. The method for detecting a flaw or the like on a workpiece according to claim 1 or 2, wherein a shape such as a depth and a size of a flaw generated on each end face is visually recognized by an operator looking at an image processed image. A device that detects scratches and dents on each end face in a state where a plurality of endless thin workpieces are in close contact with each other, and rotates the endless thin workpieces that are stacked on top of each other with the end faces facing upward. A pair of light sources that form a detection region by irradiating the end surfaces with light that is complementary to each other and are installed above the inspection table, and a detection region formed by these light sources. It consists of a camera that captures images from above and a monitor that processes and displays images captured by this camera, and detects scratches and dents on each end surface from the degree of color adhesion and color density changes in the detection area. A device for detecting a flaw on a workpiece characterized by the above.