JP2007187516A - Method and apparatus for detecting flaw of r-edge face of endless metal belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more perfectly detect the flaw 4 present at the R-edge face 1a of a thin endless metal belt 1 like a hoop while employing a light irradiation method. <P>SOLUTION: The R-edge face 1a of the endless metal belt 1 is irradiated with lights L1 and L2 in the direction, which passes the ridgeline 1b of the R-edge face 1a of the endless metal belt 1 and inclined within a range of 10-20° with respect to the virtual vertical surface PX vertical to the width direction of the endless metal belt 1, from both sides thereof. The irradiation region is photographed by the imaging means 10 arranged above the R-edge face 1a of the endless metal belt 1. The flaw 4 is detected corresponding to the shading appearing on the photographed image. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a scratch detection method and a detection device for an R end surface of an endless metal belt such as a CVT belt used in a continuously variable transmission.

  CVT belts used in continuously variable transmissions are known. In general, as shown in FIG. 7a, an endless metal belt 1 having a rectangular cross section having a width a and a thickness b in the vertical direction, called a hoop, is used for the CVT belt. The endless metal belt 1 is formed by deforming a belt-like thin plate into a cylinder, welding both ends by plasma welding or the like to form a ring shape, and then cutting it into a specified width. The endless metal belt 1 after cutting is put into a rotating container together with media containing abrasive grains and subjected to so-called barrel polishing for the purpose of chamfering both ends (R processing) and removing oxide film on the surface. .

  A plurality of endless metal belts (hoops) 1 whose end faces in the width direction are made R-end faces by barrel polishing are laminated and inserted into both sides of the block 2 as shown in FIG. Is done. As shown in FIG. 7c, in the CVT belt 3, at least one R end surface of the hoop 1 becomes a portion in contact with the block 2, and concentrated stress acts. Therefore, if a scratch 4 is attached to the R end face as shown in FIG. 7d in a process in the middle of manufacturing the hoop 1 (for example, in the barrel polishing process), the scratch 4 tends to directly cause a belt breakage.

  Although it is very unlikely that scratched hoops will appear, it is necessary to remove them completely from the production line, and for that reason, magnifying glass is currently used for the total number of hoops that are endless metal belts 1. A visual inspection of the R end face is performed. This method requires high concentration, and it is difficult to completely avoid fluctuations in judgment due to fatigue. Also, individual differences are likely to occur in the perception of the degree of wounds by the inspector. Therefore, there is a need for a method and apparatus that can detect scratches on the R end face on a uniform basis.

On the other hand, a method for inspecting surface properties by irradiating light on the surface of the surface of the article and irradiating the surface with light, a gradient of the surface generated on the screen imaged by the CCD camera, or a shade gradient, etc. It is described in Document 1 or Patent Document 2.
JP 2000-337842 A JP-A-2-82141

  The present inventors do not directly determine whether or not the R end surface of the hoop, which is an endless metal belt, is scratched, but directly irradiate light as described in Patent Documents 1 and 2. I tried to make an objective judgment using this method. However, in addition to the hoop thickness b being thin (usually on the order of 1/10 mm), as shown in FIG. 7d, the scratch 4 on the R end face produced in the manufacturing process is caused by the top region and the side part of the R end face. In many cases, it is formed on both sides of the region. By simply irradiating the R end surface without paying attention to the directionality and capturing the R end surface with the imaging device, it is formed particularly on the side region of the R end surface. We experienced that the wounds could not be clearly identified. Therefore, satisfactory detection results could not be obtained.

  The present invention has been made in view of the circumstances as described above, and it is more complete while adopting a method of irradiating light on a scratch existing on the R end surface of a thin endless metal belt such as a hoop. It is an object of the present invention to provide a scratch detection method and scratch detection device for the R end surface of an endless metal belt that can be detected easily.

  In order to solve the above-mentioned problems, the present inventors have continued further experiments to oppose light in a direction inclined at a required angle from both sides to the R end surface of an endless metal belt that is a detection target. By illuminating and imaging the illuminated R end surface from above, all the flaws including the flaws existing in the top region of the R end surface and the side region of the R end surface and the region extending from the side of the hoop are captured. It was found that it can be recognized as a shadow.

  The present invention is based on the above findings, and is present on the R end surface of an endless metal belt having a predetermined vertical width and a predetermined thickness, and at least one end in the width direction forming an R end surface. A method for detecting a flaw, wherein the direction is inclined in a range of 10 ° to 20 ° with respect to a virtual vertical plane passing through a ridge line of the R end surface of the endless metal belt and perpendicular to the width direction of the endless metal belt. The R end surface region is illuminated from both sides, and the illuminated region is imaged by an imaging means disposed above the R end surface of the endless metal belt, and according to the shadow appearing on the R end surface in the captured image. It is characterized by detecting a flaw.

  According to the method of the present invention, a non-scratched portion on the R end face of the endless metal belt appears on the imaging screen as a white-lighted region, and the scratched portion appears on the imaging screen as a shadow portion that is substantially proportional to the area of the scratch, that is, a shadow region. Appear in The inspector monitors the image captured by the imaging device on the monitor. For example, when a shadow area having a size larger than a preset value is detected, the endless metal belt has a scratch with a size that cannot be ignored. It is judged that it is formed. Thereby, an endless metal belt having scratches can be selected under an objective standard without depending on individual differences among inspectors. In addition, for example, the apparatus side may automatically measure the area of the shadow (shadow) in the unit length on the screen, and the apparatus may select an endless metal belt having a scratch based on the determination result. In any case, a suitable threshold value for the area or shape of the shadow region that determines whether or not the endless metal belt as the detection object should be excluded can be easily determined from past empirical rules.

  FIG. 1 illustrates the detection method according to the present invention more specifically. FIG. 1a shows an example of a scratch 4 that is likely to occur on the R end surface 1a of the endless metal belt 1, and FIGS. 1b and 1c explain why the scratch 4 appears as a shadow in the image. As shown in FIG. 1a, the scratch 4 usually has a top scratch 4a present in the top region of the R end surface 1a and a side portion present in the region extending from the side region of the R end surface 1a to the side surface of the endless metal belt 1. Both flaws 4b are present.

  As shown in FIG. 1 b, the endless metal belt 1 is inclined at 10 ° to 20 ° with respect to a virtual vertical plane PX that passes through the ridge line 1 b of the R end surface 1 a and is perpendicular to the width direction Y of the endless metal belt 1. Direction light L1 and L2 (illustrated with an inclination angle of ± 15 ° in the figure) are reflected from the opposite sides of the R end face region from both sides, and are reflected by a portion without a scratch 4 on the R end face 1a. Is captured by the imaging means 10 such as a CCD camera disposed above the R end surface of the endless metal belt 1, for example, on the extended line PY in the width direction Y passing through the central portion in the thickness direction. Appears as a white-lighted part.

  However, most of the reflected light of the light L1 that irradiates the top scratch 4a from the upper left side in FIG. 1b is not captured by the imaging means 10, and most of the light L2 that is irradiated from the lower right side in FIG. It passes through without being reflected at the portion 4a. Therefore, in the image of the R end surface 1a by the imaging device 10, the portion of the top scratch 4a appears as a shadow portion, that is, a shadow portion, compared to other portions. The size and shape of the shadow depend on the size and shape of the top flaw 4a.

  Also, as shown in FIG. 1c, most of the reflected light of the light L2 from the lower right side that irradiates the side flaw 4b is not captured by the imaging means 10, and again the image of the R end face 1a by the imaging device 10 Then, the portion of the side scratch 4b appears as a shadow portion, that is, a shadow portion, as compared with other portions. In FIG. 1c, if the side flaw 4b is present on the left side of the R end face 1a, the reflected light from the flawed portion of the light L1 irradiated from the upper left side is likely to enter the imaging device 10. Even though it is a scratched part, it is highly likely that the image appears as a white light region. Therefore, the detection of scratches is performed once again on the left side of the R end face in a state where the inclination angle of L2 is reversed, that is, the light L1 is irradiated from the lower left side and the light L2 is irradiated from the upper right side. To.

  As shown in the following examples, in a conventional endless metal belt whose end face is R-processed by barrel polishing, if the light inclination angle is in the range of 10 ° to 20 °, scratches existing on the R end face are removed. The shadow was almost completely detected from the captured image. With an inclination angle of 0 °, that is, with light parallel to the virtual vertical plane PX, the entire image becomes white regardless of the presence or absence of a flaw, and both the top flaw 4a and the side flaw 4b cannot be detected as shadows. It was. In addition, at an inclination angle of 5 °, there is a case where it is not possible to detect a shadow as part of both the top flaw 4a and the side flaw 4b. When the inclination angle exceeds 25 °, the top flaw 4a can be detected as a shadow, but when the inclination angle is 25 °, it may not be detected as a shadow on a part of the side flaw 4b. If exceeded, most of the side scratches 4b could not be detected as shadows. Therefore, it is shown that the inclination angle of light in the range of 10 ° to 20 ° in the present invention is a significant limitation.

  The scratch detection method according to the present invention is not limited to the above-described CVT belt hoop. For example, the scratch detection method is applied to the R end surface of an arbitrary endless metal belt such as a power transmission belt that transmits power between a plurality of axes in the same manner as the above-described CVT belt hoop. Of course, this is applicable.

  The present invention further provides a suitable apparatus for carrying out the above method in an endless metal belt having a predetermined vertical width and a predetermined thickness, wherein at least one end in the width direction forms an R end surface. An apparatus for detecting a flaw existing on an R end face, which is 10 ° to 20 ° with respect to a virtual vertical plane passing through a ridge line of the R end face of the endless metal belt and perpendicular to the width direction of the endless metal belt. Illuminating means for illuminating light in a direction inclined in a range so as to face the R end surface region from both sides, and imaging the R end surface in an illuminated state disposed above the R end surface of the endless metal belt There is disclosed a scratch detection device for an R end face of an endless metal belt, comprising at least imaging means for performing display on the screen of an image captured by the imaging means.

  In the above apparatus, the illuminating means is preferably any means as long as it can irradiate parallel light, but the illuminating means using an infrared high-intensity LED is particularly preferable, and a good image can be obtained. The illumination means may be fixed so that the inclination angle of the light is any one of the above-mentioned ranges of 10 ° to 20 °, and the inclination angle is changed within a range of at least 10 ° to 20 °. It may be fixed.

  The image pickup means is preferably a CCD camera, but may be arbitrary as long as it can pick up the R end face region irradiated with light. As the means for displaying the image picked up by the image pickup means on the screen, any conventionally known display means can be used. In addition to the image display means, an analysis control means may be provided for analyzing the light emitting area and the shadow area appearing in the image.

  In the scratch detection device for the R end surface of the endless metal belt, preferably, the device further includes an endless metal belt rotating means including a pair of rollers for supporting and rotating the endless metal belt which is a detection target. And the illumination means is arranged at a position where both sides of the R end face of the endless metal belt supported by the endless metal belt rotating means can be illuminated and the angle with respect to the virtual vertical plane can be changed. The

  In this apparatus, by providing the endless metal belt rotating means, it is possible to continuously detect the scratches on the R end surface over the entire circumference of one endless metal belt, and to change the illumination angle of the illumination means. By doing so, it becomes possible to detect more precise scratches.

  According to the present invention, it is possible to detect a scratch existing on the R end face of a thin endless metal belt such as a hoop under a uniform standard by using a method of irradiating light. .

  Hereinafter, the present invention will be described in more detail with reference to embodiments. FIG. 2 is a conceptual diagram for explaining a state when a scratch existing on the R end face of an endless metal belt is detected by the apparatus according to the present invention (FIG. 2a), and when the light inclination angle is 0 ° (FIG. 2b). It is shown together with the captured image in the case of 15 ° (FIG. 2c). FIG. 3 is a diagram for explaining that some scratches do not appear as shadows in the captured image (a white-lighted area) when the light inclination angle is 45 °. 4 is a perspective view showing an example of an apparatus according to the present invention, FIG. 5 is a perspective view showing an example of an apparatus suitable for detecting a flaw on a side surface of an endless metal belt, and FIG. 6 is a flaw detection on an R end face according to the present invention. FIG. 6 is a schematic view of an endless metal belt inspection system including the apparatus, in which FIG. 6a shows a view from above and FIG. 6b shows a view from the side.

  As shown in FIG. 2a, the scratch detection device A for the R end surface of the endless metal belt according to the present invention passes through the ridge line of the R end surface 1a of the endless metal belt 1 and is connected to the endless metal belt 1 as described with reference to FIG. A pair of lights for illuminating parallel light in a direction inclined in a range of 10 ° to 20 ° with respect to a virtual vertical plane PX perpendicular to the width direction Y so as to face the region of the R end face 1a from both sides. A means 20 (20a, 20b), an imaging means 10 for imaging the illuminated R end face 1a disposed above the R end face 1a of the endless metal belt 1, and an image taken by the imaging means 10 on a screen display Means 30.

  The pair of illumination means 20 (20a, 20b) may be fixed at an angle so as to illuminate light at a predetermined angle in the range of 10 ° to 20 ° with respect to the virtual vertical plane PX. As shown, the tilt angle may be changed in an angle range including at least a range of 10 ° to 20 ° with respect to the virtual vertical plane PX, and may be fixed at an arbitrary angle. As described with reference to FIG. 1, the two illumination means 20 (20a, 20b) are at least ± with respect to the virtual vertical plane PX so that the same device can detect the scratches 4 on both sides of the R end surface 1a. It is desirable to be able to move within a range of 20 °.

  The illuminated R end face 1 a is picked up by the image pickup device 10, which is a CCD camera, for example, and is displayed on the display (screen display means) 30. The inspector looks at the image and determines whether there is a non-negligible scratch 4 on the R end surface 1a of the endless metal belt 1 which is the object to be inspected.

  FIG. 2B is a captured image when the R end face 1a of the endless metal belt 1 having the scratch 4 shown in FIG. 1A is irradiated with light having an inclination angle of 0 ° with respect to the virtual vertical plane PX. The circled region k is a portion where the scratch 4 (the top scratch 4a and the side scratch 4b) is present, but is white due to the reflection of light, and the scratch 4 cannot be recognized as a shadow from the image. . FIG. 2c is a captured image when the same portion is irradiated with light having an inclination angle of 15 ° with respect to the virtual vertical plane PX as described above, and includes the side flaw 4b for the reason described based on FIG. The portion of the scratch 4 appears on the imaging screen as a shadow portion, that is, a shadow region. The shape and size of the shadow depends on the shape and size of the wound 4. By setting an appropriate threshold value in advance, the inspector can see the individual difference while looking at the display 30. In this state, the endless metal belt 1 having a scratch can be selected.

  When illuminated at an angle exceeding 20 ° with respect to the virtual vertical plane PX, the side scratch 4b may not be recognized as a shadow. FIG. 3 is a view corresponding to FIG. 1 for explaining it, and FIG. 3 shows a case of 45 °. As can be seen from FIG. 3a, the top flaw 4a appears in the captured image as a shadow, but as shown in FIG. 3b, the reflected light from the side flaw 4b enters the imaging device 10 and becomes a white light image.

  Table 1 shows the experimental results when the present inventors performed the detection of scratches on the R end faces of a plurality of hoops made under the same manufacturing conditions including barrel polishing by the method of the present invention. Yes.

  As can be seen from Table 1, for example, in a hoop whose end face is R-processed by barrel polishing, light in directions inclined at 10 °, 15 °, and 20 ° with respect to the virtual vertical plane PX is incident on both sides of the R end face region. Under the conditions of illuminating opposite from each other, the top flaw 4a and the side flaw 4b could be detected. At 25 °, the top flaw 4a could be detected, but the side flaw 4b was difficult to detect. At an angle exceeding 30 °, the top flaw 4a could be detected, but the side flaw 4b could not be detected. On the other hand, at 0 °, the top flaw 4a and the side flaw 4b cannot be detected, and at 5 °, it is difficult to detect both the top flaw 4a and the side flaw 4b.

  From this, in this invention, the effectiveness of using the light which inclines in the range of 10 degrees-20 degrees with respect to the said virtual perpendicular plane PX is shown for the detection of a crack | wound.

  FIG. 4 shows another example of the scratch detection device for the R end face of the endless metal belt according to the present invention. This apparatus A1 includes a driving roller 41 and a driven roller 42, and the rotation of the driving servo motor 43 gives continuous rotation to the hoop 1, which is an endless metal belt fitted between both rollers. . The pair of illumination means 20 (20a, 20b) described with reference to FIG. 2 is located on the side of the hoop 1 that is pulled by the driving roller 41 so as to sandwich the hoop 1, and the R end face 1a of the endless metal belt 1 is further located. As described above, the CCD camera is positioned as the imaging means 10 on the extension line PY in the width direction Y passing through the central portion in the thickness b direction of the endless metal belt 1. Although not shown, the driving means for giving the movement described with reference to FIG. 2 to the pair of illumination means 20 (20a, 20b) is also provided. An appropriate display (image display means) is also provided.

  The driven roller 42 is connected to a ball screw 44 for pulling the driven roller and a servo motor 45 for driving the ball screw, and the driven roller 42 advances and retreats in the direction of the arrow by driving the servo motor 45.

  In detecting the flaw, the driven roller 42 is moved, the distance between the axes of the driving roller 41 and the driven roller 42 is shortened, and the hoop 1 is installed between the driving roller 41 and the driven roller 42 in this state. To do. Thereafter, the driven roller 42 is moved in the reverse direction so that a constant tension is applied to the mounted hoop 1, and the driving roller 41 is driven. As a result, since the hoop 1 is continuously rotated, the pair of illumination means 20 (20a, 20b) and the CCD camera 10 can detect flaws on the continuous R end face over the entire circumference of the hoop 1. It becomes.

  It may be necessary to inspect the both sides of the hoop 1 for the presence of scratches or the like. FIG. 5 shows an example of the inspection apparatus B used at that time. The means for turning the hoop 1 is the same as that shown in FIG. 4, and the same reference numerals as those in FIG. In the inspection apparatus B, the coaxial illumination 52 is attached so as to surround the objective lens 51, and the illumination light from the coaxial illumination 52 is reflected by the hoop 1 and enters the objective lens 51. The incident light changes its direction by the direction switching prism 53 and is captured as an image by the CCD camera 54. The imaging screen is displayed on an appropriate display in the same manner as the scratch detection device A1 on the R end face. In the illustrated example, two inspection apparatuses B are attached so that both side surfaces of the hoop 1 can be inspected at the same time.

  A configuration example of an endless metal belt inspection system including an R end face scratch detection device according to the present invention will be described with reference to FIG. 6A shows the system configuration as seen from above, and FIG. 6B shows it as seen from the side. Also, in FIG. 6b, the hoop 1 as an object to be inspected is not shown for the sake of simplicity.

  The hoop 1 as an object to be inspected is inserted between the guides 61 and 61 in the first turntable 60 having the first guides 61 and 61 that run in parallel with a constant width. After the insertion, the first turntable 60 is rotated by 90 °, and the direction of the first guides 61, 61 is the same direction as the second guides 63, 63 at the same height as the first guides 61, 61. To do.

  Below the second guides 63, 63, the second turntable 70 and the third turntable 80 are arranged in this order. The turntables 70 and 80 have substantially the same configuration, and include a driving roller 41 and a driven roller 42 that can adjust the distance between the shafts shown in FIG. Further, each turntable 70, 80 selectively selects the raised position where the driving roller 41 and the driven roller 42 enter between the second guides 63, 63 and the lowered position shown in FIG. 6b. It can be taken. Further, each turntable 70, 80 has a first position where the driving roller 41 and the driven roller 42 are located immediately below the second guides 63, 63, and a second position rotated approximately 180 ° therefrom. You can take it selectively.

  Between the driving roller 41 and the driven roller 42 when the second turntable 70 is in the second position, a pair of illumination means 20 (20a, 20b) and the CCD camera 10 are provided as shown in FIG. The flaw detection device A1 for the R end face of the endless metal belt shown in FIG. In FIG. 6, two scratch detection devices A1 for the R end surface of the endless metal belt are provided, and both sides of the R end surface of the hoop 1 can be inspected simultaneously.

  Two side surface inspection devices B shown in FIG. 5 are provided between the driving roller 41 and the driven roller 42 when the third turntable 80 is in the second position. The side can be inspected at the same time.

  The third guides 64 and 64 are positioned at the same height and at the same height as the second guides 63 and 63, and the third guides 64 and 64 are located below the third guides 64 and 64. A reversing mechanism 65 for reversing the top and bottom of the sandwiched hoop 1 is located. Further, below the reversing mechanism 65, a fourth turntable 90 having the same configuration as the second turntable 70 again puts the driving roller 41 and the driven roller 42 between the third guides 64 and 64. A raised position and a lowered position lowered to a position where the movement of the reversing mechanism 65 shown in FIG. Further, the fourth turntable 90 also has a first position where the driving roller 41 and the driven roller 42 are located immediately below the third guides 64, 64, and a second position rotated approximately 180 ° therefrom. You can take it selectively.

  Similarly to the case of the second turntable 70, the scratch detection device for the R end surface of the endless metal belt is provided between the driving roller 41 and the driven roller 42 when the fourth turntable 90 is in the second position. Two A1 are provided so that both sides of the R end face of the hoop 1 can be inspected simultaneously.

  Further, the fourth guides 66 and 66 are positioned at the same height and the same direction as the third guides 64 and 64.

  A hoop transfer 67 is positioned above the first guides 61 and 61, the second guides 63 and 63, and the third guides 64 and 64. The hoop transfer 67 includes four hooks 68a to 68a. 68d is attached so that it can move along each guide. The function performed by the hooks 68a to 68d will be described later. When the function is fulfilled, the hoop transfer 67 and the hooks 68a to 68d may move together. Further, the hoop transfer 67 can selectively take a lowered position where the four hooks 68a to 68d enter between the guides and a raised position where the hooks 68a escape from between the guides. For ease of illustration, the hoop transfer 67 and hooks 68a-68d are not shown in FIG. 6a.

  The first hook 68a moves the hoop 1 held between the first guides 61 and 61 into the second guides 63 and 63, and the second turntable 70 moves the hoop 1 after the position change. When it is in the lowered position and the first position, it functions to move to above the drive roller 41 and the driven roller 42. The second hook 68b is connected to the driving roller 41 when the third turntable 80 is in the lowered position and in the first position with the hoop 1 sandwiched between the second guides 63, 63. The function of moving to above the driven roller 42 is achieved. The third hook 68c changes the position of the hoop 1 sandwiched between the second guides 63, 63 into the third guides 64, 64, and the fourth turntable 90 moves the position of the changed hoop 1 to the third hook 68c. When it is in the lowered position and in the first position, it functions to move along the third guides 64 and 64 to above the driving roller 41 and the driven roller 42. Further, the fourth hook 68 d functions to change the position of the hoop 1 in the third guides 64, 64 to the fourth guide 66.

  The hoop 1 held between the first guides 61 and 61 is repositioned in the second guides 63 and 63 as described above by the first hook 68a, and after the repositioning, the hoop transfer 67 is in the ascending position. The engagement between the hoop 1 and the first hook 68a is released. In this state, the second, third, and fourth turntables 70, 80, and 90 are in the lowered position.

  The second turntable 70 at the first position is raised, and the driving roller 41 and the driven roller 42 are inserted into the hoop 1. After the distance between the driving roller 41 and the driven roller 42 is increased and the hoop 1 is supported therebetween, the second turntable 70 moves to the lowered position. While driving the drive roller 41, the second turntable 70 rotates to the second position. By taking the raised position at that position, the wound detection posture shown in FIG. 4 is obtained. As already described, scratch detection on one R end face of the hoop 1 is performed.

  After the end of detection, the second turntable 70 descends and returns to the first first position. After raising again at the first position and positioning the hoop 1 fitted between the driving roller 41 and the driven roller 42 in the second guides 63, 63, the distance between the axes of the driving roller 41 and the driven roller 42 is increased. to shrink. As a result, the hoop 1 is supported by the second guides 63, 63, so that the second turntable 70 is returned to the lowered position.

  In this state, the second hook 68 b is operated, and the book 1 is moved onto the third turntable 80. The third turntable 80 performs the same operation of the second turntable 70 in the same procedure. In the process, the inspection of both side surfaces of the hoop 1 is completed.

  When the third turntable 80 returns to the lowered position at the first position and the hoop 1 is again supported by the second guides 63, 63, the third hook 68c is operated to 1 is repositioned into the third guides 64 and 64, and is fed along the third guides 64 and 64 to above the fourth turntable 90. At that position, the hoop 1 is moved to the reversing mechanism 65 side so that the posture is inverted upside down. The hoop 1 in an upside down posture is transferred again to the third guides 64 and 64.

  After the transfer, the reversing mechanism 65 is retracted. And the 4th turntable 90 raises, and the 4th turntable 90 performs the same operation | movement of the 2nd turntable 70 in the same procedure hereafter. In that process, the scratch detection of the other R end surface of the hoop 1 is performed in the same manner as in the second turntable 70.

  The hoop 1 for which the flaw detection operation has been completed is transferred from the third guides 64, 64 to the fourth guides 66, 66 by the fourth hook 68d, and is taken out as a product.

  In addition, when the detection work on one turntable is completed and the hoop is delivered to the next turntable, the work procedure is assembled so that the next hoop is newly taken in. Can be operated. Further, the work efficiency can be further improved by performing the hoop transfer (movement) operation and the hoop detection operation in parallel.

  Further, the endless metal belt inspection system described above is an example, and when the inspection of the side surface of the hoop 1 is not required, the third turntable 80, the side surface inspection device B, and the like can be omitted. Furthermore, when only one R end face needs to be inspected, the device related to the fourth turntable 90 can be omitted.

FIGS. 1A and 1B are diagrams illustrating a method for detecting a scratch on an R end surface according to the present invention, FIG. 1A illustrates an example of a scratch that is likely to occur on the R end surface of an endless metal belt, and FIGS. ing. The conceptual diagram (FIG. 2a) explaining the state at the time of detecting the flaw which exists in the R end surface of an endless metal belt with the R end surface flaw detection apparatus by this invention, and the case where the inclination angle of light is 0 degree (FIG. 2b) It is shown together with the captured image in the case of 15 ° (FIG. 2c). It is a figure explaining that a part of flaw does not appear as a shadow in a picked-up image when the inclination-angle of light is 45 degrees. The perspective view which shows an example of the flaw detection apparatus of the R end surface by this invention. The perspective view which shows an example of an apparatus suitable for detecting the damage | wound of the side surface of an endless metal belt. 6A and 6B are schematic views of an endless metal belt inspection system including an R end surface flaw detection device according to the present invention, in which FIG. 6a is a top view and FIG. 6b is a side view. 7A is a perspective view showing an endless metal belt (hoop), FIGS. 7B and 7C show a CVT belt that is assembled into a ring shape, and FIG. 7D shows the hoop 1 in cross section.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Endless metal belt (hoop), 1a ... R end surface of endless metal belt, 1b ... Ridge of R end surface, 4 ... Scratch, 4a ... Top part scratch, 4b ... Side part scratch, A, A1 ... R end surface of endless metal belt Flaw detection apparatus, L1, L2 ... light, PX ... virtual vertical plane passing through the ridge line of the R end face and perpendicular to the width direction of the endless metal belt, PY ... width passing through the center in the thickness direction of the endless metal belt Extension line of direction, B ... side inspection device, 10 ... imaging means (CCD camera), 20 (20a, 20b) ... pair of illumination means, 30 ... screen display means, 41 ... driving roller, 42 ... driven roller, 43 ... Servo motor for driving, 44 ... ball screw, 45 ... servo motor, 60 ... first turntable, 70 ... second turntable, 80 ... third turntable, 90 ... fourth turntable, 61 ... first 1 guide, 63 ... 2 guides, 64 ... third guide, 66 ... fourth guide, 65 ... inversion mechanism, 67 ... hoop transfer, 68a-68d ... first to fourth hook

Claims (4)

A method of detecting scratches present on the R end surface of an endless metal belt having a predetermined vertical width and a predetermined thickness, and at least one end in the width direction forming an R end surface,
Light in a direction inclined through the ridge line of the R end surface of the endless metal belt and inclined in a range of 10 ° to 20 ° with respect to a virtual vertical plane perpendicular to the width direction of the endless metal belt is formed on both sides of the R end surface region. And illuminating the illumination region from the opposite side, imaging the illumination region with an imaging means disposed above the R end surface of the endless metal belt, and detecting a scratch in accordance with a shadow appearing on the R end surface in the captured image. A method for detecting scratches on the R end face of an endless metal belt.   2. The method for detecting scratches on the R end face of an endless metal belt according to claim 1, wherein the endless metal belt which is the object to be detected is a CVT belt hoop. An apparatus for detecting a scratch present on the R end surface of an endless metal belt having a predetermined vertical width and a predetermined thickness and having at least one end in the width direction forming an R end surface,
Light in a direction inclined through the ridge line of the R end surface of the endless metal belt and inclined in a range of 10 ° to 20 ° with respect to a virtual vertical plane perpendicular to the width direction of the endless metal belt is formed on both sides of the R end surface region. Illuminating means for illuminating so as to face each other,
An imaging means for imaging the R end surface in an illuminated state disposed above the R end surface of the endless metal belt;
Means for displaying an image picked up by the image pickup means;
And a scratch detection device for an R end face of an endless metal belt. It is a damage | wound detection apparatus of the R end surface of the endless metal belt of Claim 3,
And further comprising an endless metal belt rotating means comprising a pair of rollers for supporting and rotating the endless metal belt which is a detection object,
The illuminating means is disposed at a position where both sides of the R end face of the endless metal belt supported by the endless metal belt rotating means can be illuminated and the angle with respect to the virtual vertical plane with respect to the width direction of the endless metal belt can be changed. A scratch detection device for an R end surface of an endless metal belt.

Images