JP6040082B2 - Hole inspection method and inspection apparatus - Google Patents

Description

  The present invention relates to an inspection method for inspecting a plurality of holes formed side by side in a circumferential direction of an inspection object having a hollow cylindrical shape, and an inspection apparatus for executing the inspection method.

  For example, a plurality of holes for supplying lubricating oil are formed side by side in the circumferential direction in the gear for an automatic transmission. And in order to supply lubricating oil appropriately, the test | inspection of the foreign material clogging in a hole is performed. Conventionally, all inspections for clogging of foreign substances in the holes have been performed visually.

  Here, as a hole inspection method, for example, as described in Patent Document 1, it has been proposed to optically inspect a hollow hole of a hollow blade of a turbine engine. In such a case, the inside of the hollow blade is irradiated with light, and the perforation is inspected based on the light emitted from the perforation.

  As another hole inspection method, for example, as described in Patent Document 2, light is transmitted through and transmitted through a plurality of through holes of a work, and deviations between light receiving areas corresponding to the through holes are detected. It has been proposed to determine the presence or absence of foreign matter in the through hole.

Japanese Patent Laid-Open No. 3-170005 International Publication WO01 / 084127

  However, when the gear hole is visually inspected as described above, the inspection is not properly performed, and a defective hole may be overlooked. In such a case, the re-inspection process takes time. Moreover, such visual inspection itself takes time, and the work efficiency is poor.

  On the other hand, as described in Patent Document 1 and Patent Document 2, there is a problem in that it takes time to determine the inspection start position even when the gear hole is inspected using light without visual inspection. . That is, since the gear has a cylindrical shape, it is necessary to rotate the gear, for example, in order to detect light emitted from the plurality of holes. When inspecting a hole by rotating the gear in this way, it is necessary to manually perform the positioning of the hole from which a plurality of holes are to be started and further to start the inspection, which takes time. .

  The present invention has been made in view of this point, and an object of the present invention is to appropriately and efficiently inspect a hole of an inspection object having a hollow cylindrical shape such as a gear for an automatic transmission.

  In order to achieve the above object, the present invention provides an inspection method for inspecting a plurality of holes formed side by side in a circumferential direction of an object to be inspected having a hollow cylindrical shape, the object being inspected While irradiating light inside the body, rotate the object to be inspected about the axis of the object to be inspected, image the object to be inspected, perform image processing of the object to be inspected, and emit light emitted from the hole In detecting and inspecting the hole, first, rotate the object to be inspected at a low speed, specify one normal hole among the plurality of holes, determine the position of the one hole as an inspection start position, Thereafter, the object to be inspected is rotated at a high speed, and the holes other than the one hole among the plurality of holes are inspected.

  Here, the determination of the inspection start position depends on the imaging capability of the imaging unit that images the object to be inspected, that is, the imaging range. For example, when the moving distance of the hole in the object to be inspected per predetermined time is larger than the imaging range of the object to be inspected by the imaging unit, when the imaging unit attempts to image one hole, the one hole becomes the imaging unit. May have passed. In such a case, the one hole cannot be imaged, and the one hole serving as the inspection start position cannot be specified. Therefore, by rotating the object to be inspected at a low speed so that the moving distance of the hole in the object to be inspected is smaller than the imaging range of the object to be inspected by the imaging unit, the imaging unit surely captures one normal hole. Can do. Therefore, the inspection start position of the object to be inspected can be appropriately determined. In addition, since the inspection start position can be automatically determined in this way, the determination does not take time and can be performed efficiently.

  Once the inspection start position is determined in this way, the object to be inspected can be rotated at a high speed when inspecting holes other than the one hole. For example, even when the moving distance of the hole in the inspection object is larger than the imaging range of the inspection object by the imaging unit, the arrangement of the plurality of holes in the inspection object is known in advance, so that the other holes are imaged. The imaging unit can image other holes in accordance with the timing of reaching the part. Then, the picked-up image can be processed to detect light emitted from other holes and appropriately inspect the other holes. In addition, since the hole to be inspected can be inspected by rotating the object to be inspected at high speed in this way, the inspection time can be shortened and the inspection cost can be reduced. Therefore, other holes can be appropriately and efficiently formed in the inspection object.

  When determining the inspection start position, the first hole in which light of a predetermined amount or more is detected a predetermined number of times may be specified as the one hole.

When determining the inspection start position, the imaging range in which the inspection object is imaged may satisfy the following formula (1).
L ≧ ωrt (1)
Where L: imaging range of the inspection object, ω: rotation speed of the inspection object, r: radius of the inspection object, t: rotation time of the inspection object

  When inspecting the other hole, the rotational speed of the object to be inspected when moving the other hole may be faster than the rotational speed of the object to be inspected when imaging the other hole.

  The object to be inspected may be a gear for an automatic transmission.

  Another aspect of the present invention is an inspection apparatus for inspecting a plurality of holes formed side by side in the circumferential direction of an object to be inspected having a hollow cylindrical shape. An illumination unit that emits light; a rotation mechanism that rotates the object to be inspected about the axis of the object to be inspected; an imaging unit that images the object to be inspected; and an image captured by the imaging unit; First, an image processing unit that detects light emitted from the hole and inspects the hole, and first rotates the inspection object at a low speed while irradiating the inside of the inspection object, so that a normal one of the plurality of holes is detected. The position of the one hole is determined as an inspection start position, and then the object to be inspected is rotated at high speed while irradiating light inside the object to be inspected, and the one of the plurality of holes is The illumination unit, the rotation mechanism, the imaging unit, and the front It is characterized by having a control unit for controlling the image processing unit.

  When determining the inspection start position, the image processing unit may specify the first hole in which a predetermined amount of light or more is detected a predetermined number of times as the one hole.

When determining the inspection start position, an imaging range in which the inspection object is imaged by the imaging unit may satisfy the following formula (1).
L ≧ ωrt (1)
Where L: imaging range of the inspection object, ω: rotation speed of the inspection object, r: radius of the inspection object, t: rotation time of the inspection object

  In the case of inspecting the other hole, the control unit is configured such that the rotation speed of the inspection object when moving the other hole is faster than the rotation speed of the inspection object when imaging the other hole. The rotation mechanism may be controlled as described above.

  The object to be inspected may be a gear for an automatic transmission.

  ADVANTAGE OF THE INVENTION According to this invention, the test | inspection of the hole of to-be-inspected object provided with the hollow cylindrical shape can be performed appropriately and efficiently.

It is a side view of the to-be-inspected object test | inspected by this Embodiment. It is a longitudinal cross-sectional view (A-A 'cross section figure of FIG. 1) of the to-be-inspected object test | inspected by this Embodiment. It is a side view which shows the outline of a structure of the test | inspection system provided with the test | inspection apparatus concerning this Embodiment. It is explanatory drawing which shows the outline of a structure of the test | inspection apparatus concerning this Embodiment. It is explanatory drawing which shows the relationship between a to-be-inspected object and an imaging part. It is explanatory drawing which shows a mode that a to-be-inspected object is test | inspected, Comprising: (a) rotates a to-be-inspected object at low speed, shows a mode that the inspection start position of the said to-be-inspected object is determined, (b) shows a to-be-inspected object. It shows a state in which the inspection object is inspected by rotating at a high speed.

  Embodiments of the present invention will be described below. In the drawings used in the following description, the quantity and size of each component do not necessarily correspond to the actual quantity and size in order to prioritize easy understanding of the technology.

In the present embodiment, a plurality of holes H formed in the inspected object W shown in FIGS. 1 and 2 are inspected. The inspected object W is a gear for an automatic transmission (for mission), for example, and has a hollow cylindrical shape. The device under test W is first the gear portion W ₁ of helical gears is formed on the surface, the second and the gear portion W ₂ where linear gear is formed in the axial direction on the surface, the first and a connecting portion W ₃ which connects the gear portion W ₁ and the second gear portion W _2. In the example shown, the first outer diameter of the gear portion W ₁ is greater than the outer diameter of the second gear unit W ₂ and the connecting portion W _3, these outer diameter may be the same.

A first gear portion W ₁ of the inspection object W, for example a plurality of holes H for supplying lubricating oil is formed. The plurality of holes H are formed at equal intervals in a first circumferential direction of the gear portion W _1. In the illustrated example, twelve holes H are formed, but the number of holes H is not limited to this and can be arbitrarily set.

  The inspected object W is inspected by the inspection system 1 shown in FIG. The inspection system 1 has a mounting table 10. A caster 11 is provided on the bottom surface of the mounting table 10, and the mounting table 10 is configured to be movable.

  On the mounting table 10, an inspection device 20 for inspecting the object W to be inspected, a carry-in part 21 for accommodating a plurality of objects to be inspected W before inspection, and an unloading part for accommodating a plurality of objects to be inspected W after inspection. 22 are provided. An object to be inspected W before inspection is carried into the inspection apparatus 20 from the carry-in portion 21 by a conveyance mechanism (not shown). Further, the inspected object W after inspection is carried out from the inspection apparatus 20 to the carry-out portion 22 by a transport mechanism (not shown). In addition, you may perform manually the conveyance of the to-be-inspected object W between these carrying-in parts 21 and the inspection apparatus 20, and the conveyance of the to-be-inspected object W between the inspection apparatus 20 and the carrying-out part 22 respectively.

As shown in FIG. 4, the inspection device 20 is provided with a support base 31 that is provided on the upper surface of the base plate 30 and fixes and supports the object W to be inspected. The support base 31 supports the test object W such that the first gear portion W ₁ of the test object W is positioned above the support base 31. On the lower surface of the base plate 30, a rotating mechanism 32 that rotates the object W connected to the support base 31 is provided. For the rotation mechanism 32, for example, a motor is used. The rotation mechanism 32 can rotate the inspection object W around the axis of the inspection object W.

  Above the object to be inspected W supported by the support base 31, an illumination unit 33 that irradiates light inside the object to be inspected W is provided. The illumination unit 33 can irradiate light having an arbitrary wavelength. The illumination unit 33 is configured to be movable by a moving mechanism (not shown).

Further, the first side of the gear portion W ₁ of the inspection object W supported on the support base 31, the imaging unit 34 is provided for imaging the object to be inspected W. For the imaging unit 34, for example, an image sensor camera is used. As shown in FIG. 5, the imaging unit 34 is provided as a pair on both sides of the first gear unit W ₁ of the object W to be inspected. When the imaging unit 34 captures an image of the inspection object W, the pair of imaging units 34 and 34 may image the inspection object W, or one of the imaging units 34 may inspect the inspection object W. The body W may be imaged.

  The imaging range L of the inspection object W by the imaging unit 34 is set to be at least larger than the diameter a of the hole H of the inspection object W.

In addition, the imaging range L of the object W to be inspected by the imaging unit 34 satisfies the following formula (1) when the object W is rotated at a low speed as will be described later. As described above, when the imaging range L satisfies Expression (1), when the imaging unit 34 images the inspection object W once, at least one hole H is imaged.
L ≧ ωrt (1)
Where L: imaging range of the inspection object W, ω: rotation speed of the inspection object W, r: radius of the inspection object W, t: rotation time of the inspection object W

  In other words, when the imaging range L of the inspected object W, the radius r of the inspected object W, and the rotation time t of the inspected object are set, respectively, the above expression (1) is satisfied. The rotational speed ω of the inspection object W is set. In the present embodiment, the imaging range L of the object W to be inspected is, for example, 5 mm to 30 mm (length in a direction substantially perpendicular to the width direction of the object W to be inspected). Further, the radius r of the inspected object W is, for example, 5 mm to 50 mm.

  As shown in FIG. 4, the image captured by the imaging unit 34 is output to the image processing unit 35. The image processing unit 35 processes the image picked up by the image pickup unit 34, detects light emitted from the hole H of the object W to be inspected, and inspects the hole H.

  A buzzer 36 and Patlite (registered trademark) 37 are provided on the base plate 30. The patrol light 37 has three lamps: a blue lamp, a yellow lamp, and a red lamp. And when it is judged that all the holes H of the to-be-inspected object W are normal based on the test result in the image processing part 35 mentioned above, the blue lamp of the patrol light 37 lights. On the other hand, when at least one of the plurality of holes H of the inspected object W is clogged with foreign matter, the red lamp of the patrol light 37 is turned on and the buzzer 36 sounds. The yellow lamp of the patrol light 37 is turned on when any abnormality occurs in the inspection apparatus 20.

  The inspection device 20 is provided with a touch panel 38. On the touch panel 38, the inspection result in the image processing unit 35 described above is displayed. The touch panel 38 is configured so that an operator can set inspection conditions in the inspection apparatus 20. As the inspection conditions, for example, the rotational speed ω of the object W to be inspected by the rotation mechanism 32, the imaging timing in the imaging unit 34, and the like are set.

  The inspection conditions set on the touch panel 38 are output to the control unit 39. The control unit 39 controls the rotation mechanism 32 and the imaging unit 34 based on the inspection conditions output from the touch panel 38, and also includes the other mechanisms of the inspection device 20, the illumination unit 33, the image processing unit 35, the buzzer 36, and the patrol light. 37 is also controlled. The control unit 39 functions as a sequencer. In the example shown in the drawing, only the arrow to the image processing unit 35 is drawn as the arrow from the control unit 39 in order to give easy viewing of the drawing.

  The inspection apparatus 20 according to the present embodiment is configured as described above. Next, an inspection method for the inspected object W performed by the inspection apparatus 20 will be described.

The inspection object W carried into the inspection apparatus 20 is fixed to and supported by the support base 31. Subsequently, the illumination unit 33 is moved above the object to be inspected W supported by the support base 31, and light is irradiated from the illumination unit 33 to the inside of the object to be inspected W. If it does so, if it is the normal hole H in which the foreign material is not clogged in the to-be-inspected object W, the light beyond a predetermined light quantity will leak from the said normal hole H. On the other hand, if the abnormal hole H is clogged with foreign matter, the above light does not leak from the abnormal hole H. Further, in this way, the inside of the inspection object W is irradiated with light, and the inspection mechanism W is rotated by the rotation mechanism 32 at a rotation speed ω ₁ of, for example, 2.0 rad / s to 7.0 rad / s, and the rotation time t _1. For example, it is rotated at a low speed for 1.0 seconds to 3.0 seconds (FIG. 6A). And the to-be-inspected object W is imaged intermittently by the imaging part 34 at intervals of 0.1 second, for example. The rotation time t ₁ is set on the basis of the tact time of the inspection process.

As described above, when the imaging unit 34 images the inspection object W, the imaging range L of the inspection object W by the imaging unit 34 substitutes ω ₁ for the rotation speed ω of the above equation (1), and the rotation time t The following formula (2) in which t ₁ is substituted for is satisfied. As described above, when the imaging range L satisfies the expression (2) and the imaging unit 34 images the object W, at least one hole H is imaged. That is, the imaging unit 34 can appropriately image the hole H.
L ≧ ω ₁ rt ₁ (2)

The images captured by the imaging unit 34 are sequentially output to the image processing unit 35. The image processing unit 35 processes the image picked up by the image pickup unit 34, detects light emitted from the hole H of the object W to be inspected, and inspects the hole H. Then, the captured image, to identify the inspection start hole H ₁ normal hole H ₁ of a predetermined amount or more pixels are detected, for example, 100 pixels or more. At this time, to ensure that inspection start hole H ₁ is normal, repetitive light a predetermined number of times in a predetermined amount by imaging, for example twice the detected first hole H ₁ and inspection start hole H ₁ of To do. Then, to determine the position of the inspection start hole H ₁ as testing start position. Incidentally, the number of times of detection of the light at the time of specifying the inspection start hole H ₁ is not limited to this embodiment and may be three or more.

Then, while continuing the irradiation of the light from the illumination part 33 to the inside of the to-be-inspected object W, the rotation mechanism 32 accelerates rotation of the to-be-inspected object W, and rotation speed (omega) ₂ of 7.0 rad / s-70. At 0 rad / s, the rotation time t ₂ is rotated at a high speed, for example, 0.05 seconds to 1.0 seconds (FIG. 6B). Thus, when rotating the to-be-inspected object W at high speed, the said Formula (1) does not need to be satisfy | filled. That is, the moving distance of the hole H in the inspection subject W may be larger than the imaging range L of the inspection subject W by the imaging unit 34. Since the positions of the plurality of holes H in the object to be inspected W is known in advance, the imaging unit 34 in accordance with the timing when the next hole H ₂ reaches the image pickup unit 34 when imaging the hole H _2, the holes H ₂ Is appropriately imaged.

Subsequently, the subsequent holes H ₃ to H ₁₂ are similarly imaged by the imaging unit 34 in a state where the object W is rotated at a high speed.

The images captured by the imaging unit 34 are sequentially output to the image processing unit 35. In the image processing unit 35 processes the image captured by the imaging unit 34 detects the light emitted from the hole H _{2 ~} hole H ₁₂ of the device under test W, to inspect the holes H _{2 ~} hole H ₁₂ . Then, the hole H in which light of a predetermined amount or more is detected is determined as a normal hole without foreign matter clogging, and the hole H in which the light is not detected is determined as an abnormal hole with foreign matter clogging.

  When it is determined that all the holes H of the inspected object W are normal based on the inspection result in the image processing unit 35, the blue lamp of the patrol light 37 is turned on. On the other hand, if at least one of the plurality of holes H of the inspected object W is clogged with foreign matter, the red lamp of the patrol light 37 is turned on and the buzzer 36 sounds to warn.

  In addition, the inspection result in the image processing unit 35 is output to the touch panel 38, and the inspection result is displayed on the touch panel 38.

  Thus, a series of inspections of the inspected object W in the inspection apparatus 20 is completed.

According to the above embodiment, the inspection object W is rotated at a low speed at the rotational speed ω ₁ , and the imaging range L of the inspection object W by the imaging unit 34 satisfies the above formula (2). the imaging unit 34 is reliably captured one of the holes H _1, it may be identified as test start hole H ₁ of the hole H ₁ of the one. Therefore, it is possible to appropriately determine the inspection start position of the inspection subject W. In addition, since the inspection start position can be automatically determined in this way, the determination does not take time and can be performed efficiently.

Further, since the specific inspection start hole H ₁ of the first hole H ₁ of the light of the predetermined light intensity is detected twice, possible to ensure that the inspection start hole H ₁ is normal. Therefore, the inspection start position of the inspection subject W can be determined more appropriately.

Once the inspection start position of the inspection subject W is determined in this way, the inspection subject W can be rotated at a high speed when inspecting the other holes H ₂ to H ₁₂ . At this time, when the object W is rotated at a high speed in this way, even when the above equation (1) is not satisfied, the imaging unit 34 is synchronized with the timing at which the holes H ₂ to H ₁₂ reach the imaging unit 34. There can image the hole _{H 2} ~ hole _{H 12.} Also, since in this way the inspection object W can be inspected hole H _{2 ~} hole H ₁₂ is rotated at high speed, it is possible to shorten the inspection time can be cheaper the inspection cost. Therefore, the holes H ₂ to H ₁₂ can be appropriately and efficiently performed in the inspection object W.

In the above embodiment, when imaging a decision after the holes H _{2 ~} hole H ₁₂ of the inspection object W by the image pickup unit 34 of the inspection start position of the inspection start hole H ₁ of the inspection object W, the object to be inspected W the had is rotated at a high speed at a rotation speed omega _2, a rotational speed omega ₃ slower than the rotation speed omega ₂ may be rotated inspection object W. In such a case, after determining the inspection start position of the inspection start hole H ₁ of the inspection object W, when moving the next hole H ₂ in the imaging unit 34 rotates the inspection object W at a rotational speed omega _2. Then the hole _{H 2} reaches the image pickup unit 34, slow down the rotation of the inspection object W, rotating the object to be inspected W at a rotational speed omega ₃ example 7.0rad / s~13.0rad / s. Then, in a state where the inspection subject W is rotated at the rotational speed ω _{3 as} described above, the imaging unit 34 images the hole H ₂ , and the image processing unit 35 inspects the hole H ₂ . Rotate the inspection object W likewise at a rotation speed omega ₂ moves the hole H _{3 ~} holes H _12, holes H _{3 ~} hole in the imaging unit 34 while rotating the inspection object W at a rotational speed omega ₃ H ₁₂ is imaged, and the hole H ₃ to hole H ₁₂ are inspected in the image processing unit 35.

According to the present embodiment, when the imaging unit 34 captures the holes H ₃ to H ₁₂ , the rotation of the object W is decelerated, so that the holes H ₃ to H ₁₂ can be captured more reliably. can do. Therefore, these holes H ₃ to H ₁₂ can be inspected more appropriately.

  In the above embodiment, the case where the gear for an automatic transmission is used as the inspection object W has been described, but the inspection object W to be inspected is not limited to this. The present invention can also be applied, for example, when inspecting a foreign substance clogging of a cylindrical substance.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

Hereinafter, the effects when the inspection apparatus and the inspection method of the present invention are used will be described. In this embodiment, the transmission gear is used by using the inspection apparatus 20 shown in FIG. 4 (inspection system 1 shown in FIG. 3) and the inspection method shown in FIG. 6 of the above embodiment. All the holes H of the object W to be inspected were inspected. Moreover, as a conventional comparative example, all the holes H of the to-be-inspected object W were inspected visually. Further, the radius r of the inspection object W is 14 mm, the rotation speed ω ₁ of the inspection object W is 4.0 rad / s, the rotation time t ₁ of the inspection object W is 1.5 seconds, The rotation speed ω ₂ of the inspection object W is 63.0 rad / s, the rotation time t ₂ of the object W to be processed is 0.1 second, and the imaging range L of the inspection object W is 10 mm.

  Table 1 shows the results of inspection under the above conditions. In Table 1, the inspection time (inspection man-hours) indicates the rust prevention and packing for the inspection object W after the inspection after storing the inspection object W before the inspection in addition to the inspection of the hole H of the inspection object W. Consider the work up to. The sorting time (sorting man-hour) is a process in the case where the subject W is re-sorted due to an oversight of the abnormal hole H.

  Referring to Table 1, when the inspection apparatus 20 of the present invention is used, the inspection time is reduced by 50% or more as compared with the conventional visual inspection. Further, the inspection apparatus 20 of the present invention does not overlook the abnormal hole H, and it is not necessary to re-sort the object to be inspected W, so that the conventional sorting time can be omitted. Therefore, according to the present invention, it has been found that the time required for the inspection can be reduced as a whole, and the inspection of the inspected object W can be performed efficiently. When only the time required for determining the inspection start position is compared, 60% of the time can be shortened compared to the conventional method. Moreover, according to this invention, it turned out that the running cost concerning the test | inspection of the to-be-inspected object W can also be reduced in proportion to test | inspection time as test | inspection time decreases.

  INDUSTRIAL APPLICABILITY The present invention is useful when inspecting a plurality of holes formed side by side in the circumferential direction of an object to be inspected having a hollow cylindrical shape.

DESCRIPTION OF SYMBOLS 1 Inspection system 10 Mounting base 11 Caster 20 Inspection apparatus 21 Carry-in part 22 Carry-out part 30 Base plate 31 Support stand 32 Rotation mechanism 33 Illumination part 34 Imaging part 35 Image processing part 36 Buzzer 37 Patrite (trademark)
38 Touch Panel 39 Control Unit H Hole W Inspected Object W ₁ First Gear Portion W ₂ Second Gear Portion W ₃ Connecting Portion

Claims (10)

In an inspection object having a hollow cylindrical shape, an inspection method for inspecting a plurality of holes formed side by side in the circumferential direction of the inspection object,
While irradiating light inside the inspection object, rotate the inspection object around the axis of the inspection object, image the inspection object, perform image processing of the inspection object, and exit from the hole In inspecting the hole by detecting light,
First, rotate the object to be inspected at a low speed, specify a normal one of the plurality of holes, determine the position of the one hole as an inspection start position,
Then, a to-be-inspected object is rotated at high speed, and other holes other than said one hole are test | inspected among these holes, The inspection method of the hole characterized by the above-mentioned. 2. The hole inspection method according to claim 1, wherein when determining the inspection start position, the first hole in which light of a predetermined light amount or more is detected a predetermined number of times is specified as the one hole. 3. The hole inspection method according to claim 1, wherein when determining the inspection start position, an imaging range in which the inspection object is imaged satisfies the following expression (1).
L ≧ ωrt (1)
Where L: imaging range of the inspection object, ω: rotation speed of the inspection object, r: radius of the inspection object, t: rotation time of the inspection object When inspecting the other hole, the rotational speed of the inspection object when moving the other hole is faster than the rotation speed of the inspection object when imaging the other hole, The inspection method according to claim 1. The hole inspection method according to claim 1, wherein the object to be inspected is a gear for an automatic transmission. In an inspection object having a hollow cylindrical shape, an inspection apparatus for inspecting a plurality of holes formed side by side in the circumferential direction of the inspection object,
An illumination unit that irradiates light inside the object to be inspected;
A rotation mechanism that rotates the object to be inspected around the axis of the object to be inspected;
An imaging unit for imaging the object to be inspected;
An image processing unit that processes an image captured by the imaging unit, detects light emitted from the hole, and inspects the hole;
First, the object to be inspected is rotated at a low speed while irradiating light inside the object to be inspected, a normal one of the plurality of holes is specified, and the position of the one hole is determined as an inspection start position. Then, the illumination unit, the rotation, so as to inspect other holes other than the one of the plurality of holes by rotating the inspection object at high speed while irradiating light inside the inspection object A hole inspection apparatus comprising: a mechanism, a control unit that controls the imaging unit and the image processing unit. The hole according to claim 6, wherein when determining the inspection start position, the image processing unit identifies the first hole in which light of a predetermined light amount or more is detected a predetermined number of times as the one hole. Inspection equipment. The hole inspection apparatus according to claim 6 or 7, wherein when determining the inspection start position, an imaging range in which an object to be inspected is imaged by the imaging unit satisfies the following expression (1).
L ≧ ωrt (1)
Where L: imaging range of the inspection object, ω: rotation speed of the inspection object, r: radius of the inspection object, t: rotation time of the inspection object In the case of inspecting the other hole, the control unit is configured such that the rotation speed of the inspection object when moving the other hole is faster than the rotation speed of the inspection object when imaging the other hole. The hole inspection apparatus according to claim 6, wherein the rotation mechanism is controlled as described above. The hole inspection apparatus according to claim 6, wherein the object to be inspected is a gear for an automatic transmission.

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