JP2009069374A - Inner surface inspection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inner surface inspection device capable of inspecting a hole, regardless of being a small-diameter hole or a deep hole. <P>SOLUTION: A flat part 21 is formed by polishing the base end of a columnar body 11 to a flat-shape, and a conical part 22 is formed by conically hollowing out the leading end of the body 11 and polishing. An illumination 12 is formed to a circular ring-shape, and illumination light 41 is emitted toward the flat part 21 of the columnar body 11. The illumination light 41 is inputted from the flat part 21 into the columnar body 11, then, guided toward the leading end while reflecting the light by the circumferential surface 51. The light is reflected by the slope 23 of the conical part 22 and outputted outside the columnar body 11 so as to illuminate the inner surface 4 of the hole 3 as an inspection object. The inner surface 4 illuminated with the illumination light 41 is reflected on the slope 23 of the conical part 22, then, the image is picked up by a CCD camera 13 through the flat part 21 of the columnar body 11 and the center aperture 31 of the illumination 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an inner surface inspection apparatus that inspects the state of an inner surface of a hole.

  Conventionally, when inspecting the inner surface of a hole, an inner surface inspection device has been used (for example, Patent Document 1).

  This inner surface inspection apparatus includes an endoscope that is inserted into a hole to be inspected. The endoscope includes a cylindrical scope body, a light guide provided in the scope body, and a glass pipe at the distal end of the scope body. And a cone-shaped cone mirror fixed through the.

As a result, the image projected on the cone mirror of the endoscope is picked up by the CCD camera so that the inspection can be performed.
JP-A-9-089788

  However, in such a conventional inner surface inspection apparatus, it has been necessary to provide a cylindrical glass pipe for supporting the cone mirror on the outer peripheral portion thereof.

  Moreover, in order to irradiate illumination, a light guide is required further outside the glass pipe, and the outer dimensions are increased.

  For this reason, it was unsuitable for the inspection of a hole having a small diameter.

  In order to cope with a reduction in diameter, a method of reducing the diameter of the cone mirror can be considered. In this case, it is necessary to enlarge an image projected on the cone mirror with a lens. However, if the lens is brought close to the cone mirror, a deep hole cannot be inspected.

  The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide an inner surface inspection apparatus capable of inspecting a hole having a small diameter or a deep hole. is there.

  In order to solve the above problems, in the inner surface inspection apparatus of the present invention, in the inner surface inspection apparatus for inspecting the state of the inner surface of the hole, the base end is a transparent columnar shape inserted into the hole from the distal end portion. A cylindrical body provided with a flat portion polished in a flat shape and a conical portion whose tip is pierced into a conical shape and polished, and light is input from the flat portion into the cylindrical body and guided by the cylindrical body. Illumination irradiating means for illuminating the inner surface by reflecting the reflected light at the conical portion, and imaging means for imaging the state of the inner surface reflected by the conical portion through the flat portion.

  That is, the illumination light from the illumination irradiating means is input into the cylindrical body from the flat portion at the base end of the cylindrical body, and travels through the cylindrical portion while being totally reflected on the side surface of the cylindrical body. And it reflects with the cone part of this cylindrical body front-end | tip, and is irradiated to the inner surface of a test object hole.

  The reflected light from the inner surface irradiated with the illumination light is reflected by the conical portion and proceeds to the proximal end side of the cylindrical body, and travels straight through the plane portion formed by the proximal end and is input to the imaging means.

  Thereby, the state of the inner surface illuminated by the illumination light is imaged by the imaging means, and the presence or absence of a defect or the like is inspected.

  At this time, the conical portion that reflects the inner surface is integrally formed with the cylindrical body by grinding and grinding the tip end surface of the solid cylindrical body. For this reason, the conical part of the same diameter as the diameter of the cylindrical body inserted in the hole is formed.

  Further, the illumination light is irradiated at a substantially right angle with respect to the inner surface. For this reason, light close to regular reflection can be imaged.

  Furthermore, the image reflected on the conical portion is guided by a solid cylindrical body and reaches the imaging means, so that it appears to float due to the refractive index of the cylindrical body. For this reason, the lens of the imaging means can be installed at a distant position, and a deep hole can be inspected.

  As described above, in the inner surface inspection apparatus of the present invention, the tip of the solid cylindrical body is pierced and polished to form a conical portion that reflects the inner surface of the inspection target hole, so that it is inserted into the inspection target hole. A conical portion having the same diameter as that of the cylindrical body can be formed integrally with the cylindrical body.

  For this reason, the diameter can be reduced as compared with the conventional case in which a cylindrical glass pipe is provided on the outer periphery of the conical cone mirror to support the cone mirror.

  In addition, the illumination light can be guided by a solid cylindrical body and applied to the inner surface of the hole to be inspected, so compared with the conventional case where a light guide is provided outside the glass pipe supporting the cone mirror to illuminate the illumination. Therefore, it is possible to prevent an increase in diameter for illumination.

  Accordingly, since the diameter of the cylindrical body can be reduced without reducing the diameter of the conical portion that reflects the inner surface, even a hole having a small diameter can be inspected.

  At this time, the illumination light is irradiated at a substantially right angle to the inner surface. For this reason, since light close to regular reflection can be imaged, it is suitable for inspection of defects such as nests and chips formed on the inner surface.

  Then, the image reflected on the cone portion is guided by a solid cylinder and reaches the imaging means, and appears to be lifted by the refractive index of the cylinder, and the apparent distance between the image and the lens of the camera. Can be brought closer.

  As a result, compared with the case where the image reflected on the cone mirror is taken through the hollow body, the cone portion can be set at a position away from the deeper hole even if the focal length of the camera lens is the same. Can be inspected.

  Therefore, it is possible to inspect even a small hole having a small diameter.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a view showing an inner surface inspection apparatus 1 according to the present embodiment. The inner surface inspection apparatus 1 shows a state of an inner surface 4 of an inspection object hole 3 provided in a workpiece 2 to be inspected including a cylindrical body and the like. It is a device to inspect.

  The inner surface inspection apparatus 1 includes a cylindrical body 11 inserted into the inspection object hole 3, an illumination 12 as an illumination irradiation unit disposed on the proximal end side of the cylindrical body 11, and a proximal end side of the cylindrical body 11. And a CCD camera 13 as an image pickup means.

  The columnar body 11 is formed in a solid columnar shape with transparent glass or acrylic, and the columnar body 11 is configured to be inserted into the inspection object hole 3 from its tip.

  The base end surface of the cylindrical body 11 is polished in a flat shape, and a flat plane portion 21 is formed at the base end of the cylindrical body 11. Further, the front end surface of the cylindrical body 11 is polished after being pierced in a conical shape, and a conical portion 22 that is receded in a conical shape is provided at the front end of the cylindrical body 11. .

  The inclined surface 23 of the conical portion 22 may be coated after polishing, and is preferably mirror-coated. The slope 23 is set so as to incline about 45 degrees with respect to the central axis 24 of the cylindrical body 11.

  The illumination 12 is formed in a circular ring shape, and a central opening 31 is provided at the center. The illumination 12 is disposed at a position slightly away from the base end of the cylindrical body 11, and the center thereof is set on the central axis 24 of the cylindrical body 11. Accordingly, the cylindrical body 11 is configured to be disposed directly below the central opening 31 of the illumination 12.

  From this illumination 12, it is comprised so that illumination light 41 may be irradiated toward this plane part 21 from the outer peripheral part slanting upper part of the said plane part 21 of the said cylindrical body 11 toward the said plane part 21, and this illumination light 41 is said plane | planar It is comprised so that it may input into the said cylindrical body 11 from the part 21. FIG.

  The illumination light 41 is configured to be guided to the distal end side along the cylindrical body 11 while being refracted by the planar portion 21 and reflecting the peripheral surface 51 of the cylindrical body 11. The portion is configured to be reflected by the inclined surface 23 of the conical portion 22 and output to the outside of the cylindrical body 11.

  Thereby, it is comprised so that the inner surface 4 of the said to-be-inspected hole 3 can be illuminated with the said illumination light 41 from the said illumination 12, The site | part of the said inner surface 4 illuminated with this illumination light 41 is the said cone part 22. It is configured to be reflected on the slope 23.

  The CCD camera 13 is disposed above the illumination 12, and the lens 61 of the CCD camera 13 is disposed directly above the central opening 31 of the illumination 12.

  Accordingly, the CCD camera 13 is configured such that the lens 61 faces the flat surface portion 21 of the cylindrical body 11 through the central opening 31 of the illumination 12. The state of the inner surface 4 reflected on the part 22 can be imaged by the CCD camera 13 through the flat part 21 and the central opening 31 of the illumination 12.

  The CCD camera 13 is connected to a control device composed of a personal computer (not shown) and is configured to inspect the state of the inner surface 4 by analyzing the acquired inner surface image.

  In the above configuration, when inspecting the inspection target hole 3 of the workpiece 2 to be inspected, the cylindrical body 11 is inserted into the inspection target hole 3 from the tip, and the illumination 12, the CCD camera 13, and the cylindrical body 11 are inserted. Is inspected while moving the inspection work 2 with respect to the illumination 12, the CCD camera 13 and the cylindrical body 11.

  At this time, the illumination light 41 from the illumination 12 is input into the cylindrical body 11 from the flat surface portion 21 at the base end of the cylindrical body 11 and is totally reflected on the peripheral surface 51 of the cylindrical body 11. Go inside. Then, the light is reflected by the inclined surface 23 of the conical portion 22 at the tip of the cylindrical body 11 and irradiated on the inner surface 4 of the inspection object hole 3.

  The reflected light 71 from the inner surface 4 irradiated with the illumination light 41 is reflected by the inclined surface 23 of the conical portion 22 and proceeds to the proximal end side of the cylindrical body 11, and travels straight through the flat portion 21 formed by the proximal end. Then, the image is picked up by the CCD camera 13 through the lens 61.

  Thereby, the state of the inner surface 4 illuminated by the illumination light 41 can be imaged by the CCD camera 13, and the presence or absence of a defect can be inspected from the inner surface image by the control device.

  At this time, the conical portion 22 that reflects the inner surface 4 is integrally formed with the cylindrical body 11 by grinding and polishing the tip end surface of the solid cylindrical body 11. For this reason, a conical portion 22 having the same diameter as the cylindrical body 11 inserted into the inspection object hole 3 can be integrally formed with the cylindrical body 11.

  For this reason, the diameter can be reduced as compared with the conventional case in which a cylindrical glass pipe is provided on the outer periphery of the conical cone mirror to support the cone mirror.

  Further, the illumination light 41 can be guided by the solid cylindrical body 11 and applied to the inner surface 4 of the inspection object hole 3. For this reason, compared with the conventional case where a light guide is provided outside the glass pipe supporting the cone mirror to irradiate illumination, it is possible to prevent an increase in diameter for illumination.

  Thereby, since the diameter of the cylindrical body 11 can be reduced without reducing the diameter of the conical portion 22 that reflects the inner surface 4, it is possible to inspect even the inspection object hole 3 having a small diameter.

  Moreover, the illumination light 41 is irradiated at a substantially right angle with respect to the inner surface 4, and light close to regular reflection can be imaged. Therefore, it is suitable for imaging defects such as nests and chips formed on the inner surface 4, and can be applied to these inspections.

  The CCD camera 13 and the illumination 12 can be arranged on the base end side of the cylindrical body 11, and the illumination light 41 from the illumination 12 can be irradiated at a substantially right angle to the inner surface 4. For this reason, as shown in FIG. 2, even a stepped hole 101 whose inner diameter changes in the middle part and a non-through hole 103 having a bottom surface 102 can be inspected to every corner.

  Further, the image reflected on the conical portion 22 is guided by the solid cylindrical body 11 and reaches the lens 61 of the CCD camera 13, so that the image appears to be lifted by the refractive index of the cylindrical body 11. The apparent focal position can be brought closer.

  For this reason, as shown in FIG. 3, even if the focal length is the same as when the image reflected on the cone mirror 201 is captured by the CCD camera 203 through the hollow body 202, the CCD camera 13 can reduce the cone. The part 22 can be set at a position away, and a deeper inspection target hole 3 can be inspected.

  Therefore, the inspection can be performed even for the deep inspection target hole 3 having a small diameter.

It is a figure which shows one embodiment of this invention. It is explanatory drawing which shows the usage example of the same embodiment. It is explanatory drawing which shows the effect of the same embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner surface inspection apparatus 2 Work to be inspected 3 Hole to be inspected 4 Inner surface 11 Cylindrical body 12 Illumination 13 CCD camera 21 Plane portion 22 Conical portion 61 Lens

Claims (1)

In the inner surface inspection device that inspects the state of the inner surface of the hole,
A columnar body provided with a transparent columnar shape inserted into the hole from the distal end portion and having a base end polished flatly and a conical portion with a distal end penetrating conically and polished; ,
Illumination irradiating means for illuminating the inner surface by inputting light from the planar portion into the cylindrical body and reflecting the light guided by the cylindrical body at the conical portion;
Imaging means for imaging the state of the inner surface reflected in the conical portion via the plane portion;
An inner surface inspection apparatus comprising:

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