JP6235816B2 - Defect inspection equipment for molded products - Google Patents

Defect inspection equipment for molded products Download PDF

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JP6235816B2
JP6235816B2 JP2013146340A JP2013146340A JP6235816B2 JP 6235816 B2 JP6235816 B2 JP 6235816B2 JP 2013146340 A JP2013146340 A JP 2013146340A JP 2013146340 A JP2013146340 A JP 2013146340A JP 6235816 B2 JP6235816 B2 JP 6235816B2
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inspection
defect
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inspection object
pressure
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JP2015017933A (en
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孝 末藤
孝 末藤
裕行 山本
裕行 山本
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Nok Corp
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Description

本発明は、例えばダストカバーなど、ゴム状弾性材料(ゴム材料又はゴム状弾性を有する合成樹脂材料)からなり少なくとも一端が開口された筒状の成形品の欠陥の有無を検査するための装置に関する。   The present invention relates to an apparatus for inspecting whether there is a defect in a cylindrical molded article made of a rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity) such as a dust cover and having at least one end opened. .

従来、ゴム状弾性材料からなる成形品の欠陥の有無を検査するための装置として、例えば下記の特許文献に開示されたようなものが広く知られている。   2. Description of the Related Art Conventionally, as an apparatus for inspecting the presence or absence of defects in a molded product made of a rubber-like elastic material, for example, those disclosed in the following patent documents are widely known.

この種の欠陥検査装置は、図5に示すように、ダストカバーなどゴム状弾性材料で筒状に成形された成形品である被検査物Wを載置する検査台101と、この検査台101を低速で旋回駆動させる駆動装置102と、検査台101上の被検査物Wに向けて照明光を照射する光源103と、被検査物Wの表面からの反射光を受光して撮像するCCDカメラ等からなる撮像装置104と、駆動装置102の駆動制御や、撮像装置104からの画像データの画像処理による欠陥判定のための種々の演算処理を行う演算処理装置105を備える。   As shown in FIG. 5, this type of defect inspection apparatus includes an inspection table 101 on which an inspection object W that is a molded product formed into a cylindrical shape with a rubber-like elastic material such as a dust cover, and the inspection table 101. , A drive device 102 that rotates at a low speed, a light source 103 that irradiates illumination light toward the inspection object W on the inspection table 101, and a CCD camera that receives and captures reflected light from the surface of the inspection object W. And an arithmetic processing unit 105 that performs various control processes for determining a defect by image processing of image data from the imaging apparatus 104 and driving control of the driving apparatus 102.

すなわち上記構成を備える従来の欠陥検査装置は、被検査物Wの表面の画像が撮像装置104によって撮像され、その画像データが演算処理装置105に入力され、この演算処理装置105において、画像データの各画素の輝度値等の相違から、被検査物Wの表面に存在する欠陥を検出するものである。また、この種の欠陥検査装置においては、被検査物Wを不図示の押圧治具を用いて機械的に押圧変形させて小さな傷や亀裂などからなる欠陥部分を拡張させることにより、これを検出しやすくすることも知られている(例えば下記の特許文献1参照)。   That is, in the conventional defect inspection apparatus having the above configuration, an image of the surface of the inspection object W is picked up by the image pickup device 104, and the image data is input to the arithmetic processing device 105. In the arithmetic processing device 105, the image data A defect present on the surface of the inspection object W is detected from a difference in luminance value of each pixel. In this type of defect inspection apparatus, this is detected by mechanically pressing and deforming the object W to be inspected using a pressing jig (not shown) to expand a defective portion made up of small scratches or cracks. It is also known to facilitate this (see, for example, Patent Document 1 below).

実開平4−8952号公報Japanese Utility Model Publication No. 4-8952

しかしながら、押圧治具によって被検査物Wを変形させるものは、被検査物Wは治具と接触している部分しか変形しないため、部位に関係なく欠陥部分を均一に拡張させることは困難であり、しかも被検査物Wの形状に応じて異なる治具を用意する必要があるといった問題も指摘される。   However, since the object to be inspected W is deformed only by the part in contact with the jig, the object to be inspected W is deformed by the pressing jig. In addition, a problem that it is necessary to prepare different jigs according to the shape of the inspection object W is pointed out.

本発明は、以上のような点に鑑みてなされたものであって、その技術的課題は、ゴム状弾性材料からなり少なくとも一端が開口された筒状の成形品の欠陥を検査する装置において、欠陥検査の信頼性を向上させることにある。   The present invention has been made in view of the above points, and the technical problem thereof is an apparatus for inspecting a defect of a cylindrical molded article made of a rubber-like elastic material and having at least one end opened. It is to improve the reliability of defect inspection.

求項1の発明に係る成形品の欠陥検査装置は、ゴム状弾性材料で成形され少なくとも一端が開口された筒状の被検査物の欠陥を検査する装置であって、前記被検査物を嵌着する検査台と、前記被検査物の内周空間へこの内周空間が所定の圧力値となるように給気することによりこの被検査物を膨張させる給気手段と、前記被検査物の表面を撮像する撮像手段と、この撮像手段からの画像データを構成する各画素の輝度値をあらかじめ設定された閾値と比較し、輝度値が所定の閾値を超える画素の面積に基づいて欠陥部分の有無を判定する判定手段を備えることを特徴とするものである。 Motomeko moldings defect inspection apparatus according to one aspect of the present invention, at least one end is molded of rubber-like elastic material is an apparatus for inspecting defects of the opened tubular object to be inspected, the inspection object An inspection table to be fitted, an air supply means for expanding the inspection object by supplying air to the inner peripheral space of the inspection object so that the inner peripheral space has a predetermined pressure value, and the inspection object An image pickup means for picking up the surface of the image, and the luminance value of each pixel constituting the image data from the image pickup means is compared with a preset threshold value, and the defective portion is based on the area of the pixel whose luminance value exceeds a predetermined threshold value. It is characterized by comprising a judging means for judging the presence or absence of the.

上記構成によれば、被検査物の表面に傷や亀裂などによる欠陥部分が存在する場合、この欠陥部分が、被検査物の膨張前は閉じた状態であっても、給気手段からの給気によって被検査物を膨張させることで、前記欠陥部分が開くように拡張されるので、撮像手段による画像データから確実に抽出することができる。   According to the above configuration, when a defective part due to scratches or cracks is present on the surface of the inspection object, even if the defective part is closed before the inspection object is expanded, the supply from the air supply means is performed. By expanding the object to be inspected by air, the defect portion is expanded so as to open, so that it can be reliably extracted from the image data obtained by the imaging means.

また、請求項2の発明に係る成形品の欠陥検査装置は、請求項1に記載の構成において、被検査物の内周空間の圧力を検出する圧力計測手段を備え、前記判定手段が、前記圧力計測手段による計測値に基づいて欠陥部分が貫通しているか非貫通かを判定することを特徴とするものである。 A defect inspection apparatus for a molded product according to a second aspect of the present invention is the structure according to the first aspect, further comprising pressure measuring means for detecting the pressure in the inner peripheral space of the inspection object, wherein the determination means includes the determination means, It is characterized in that it is determined whether the defective portion is penetrating or not penetrating based on the measured value by the pressure measuring means.

上記構成によれば、被検査物の欠陥部分が非貫通の傷や亀裂などによるものである場合は、給気手段からの給気によって被検査物の内周空間の圧力は所定の時間以内に設定値に達するが、被検査物の欠陥部分が貫通した傷や亀裂などによるものである場合、給気手段から加圧供給された気体は貫通した欠陥部分から漏れるので、被検査物の内周空間の圧力は所定の時間以内に設定値に達しないため、これによって欠陥部分の貫通・非貫通の判定が可能となる。   According to the above configuration, when the defective part of the inspection object is caused by non-penetrating scratches or cracks, the pressure in the inner peripheral space of the inspection object is within a predetermined time due to supply from the air supply means. When the set value is reached, but the defective part of the object to be inspected is due to a scratch or crack that has penetrated, the gas pressurized and supplied from the air supply means leaks from the defect part that has penetrated. Since the pressure in the space does not reach the set value within a predetermined time, it is possible to determine whether or not the defective portion has penetrated.

また、請求項3の発明に係る成形品の欠陥検査装置は、請求項1又は2に記載の構成において、被検査物の内周空間への給気が、前記被検査物を嵌着する前記検査台に設けられた加圧気体供給路を介して行われることを特徴とするものである。 Further, the molded product defect inspection apparatus according to the invention of claim 3, in the structure according to claim 1 or 2, supply air to the inner peripheral space of the object to be inspected, fits the object to be inspected the It is performed through a pressurized gas supply path provided on the inspection table.

上記構成によれば、被検査物を検査台に嵌着する際に、この検査台に形成された加圧気体供給路を通じて被検査物の内周空間に給気することでこの被検査物が膨張されるので、嵌着作業及び取り外し作業を容易に行うことができる。   According to the above configuration, when the inspection object is fitted to the inspection table, the inspection object is supplied by supplying air to the inner peripheral space of the inspection object through the pressurized gas supply path formed in the inspection table. Since it is inflated, the fitting operation and the removing operation can be easily performed.

本発明に係る成形品の欠陥検査装置によれば、被検査物の内周空間への給気によって、被検査物を全周均一に膨張変形させ、従来の技術では検出不可能であった、閉じた亀裂等による欠陥部分が検出可能となり、被検査物の形状に応じて異なる治具を用意する必要もなく、しかも欠陥部分の貫通・非貫通の別も判定可能であり、欠陥検査の信頼性を向上させることができる。   According to the defect inspection apparatus for molded articles according to the present invention, the object to be inspected is inflated and deformed uniformly around the entire periphery by supplying air to the inner peripheral space of the object to be inspected. It is possible to detect defective parts due to closed cracks, etc., and it is not necessary to prepare different jigs according to the shape of the object to be inspected, and it is possible to determine whether the defective part has penetrated or not penetrated. Can be improved.

本発明に係る成形品の欠陥検査装置の好ましい実施の形態を示す概略構成説明図である。It is a schematic structure explanatory view showing a preferred embodiment of a molded product defect inspection apparatus according to the present invention. 被検査物を膨張させずに撮像した画像の例を示す説明図である。It is explanatory drawing which shows the example of the image imaged without expanding the to-be-inspected object. 図2と同じ被検査物を給気によって膨張させた状態で撮像した画像の例を示す説明図である。It is explanatory drawing which shows the example of the image imaged in the state which expanded the same to-be-inspected object by FIG. 2 with supply air. 本発明に係る成形品の欠陥検査装置の他の好ましい実施の形態を示す概略構成説明図である。It is schematic structure explanatory drawing which shows other preferable embodiment of the defect inspection apparatus of the molded article which concerns on this invention. 従来技術による成形品の欠陥検査装置の一例を示す概略構成説明図である。It is schematic structure explanatory drawing which shows an example of the defect inspection apparatus of the molded article by a prior art.

以下、本発明に係る成形品の欠陥検査装置の好ましい実施の形態について、図面を参照しながら説明する。   Hereinafter, a preferred embodiment of a defect inspection apparatus for a molded product according to the present invention will be described with reference to the drawings.

図1は、本発明の実施の形態による欠陥検査装置の概略構成を示すものである。すなわちこの欠陥検査装置は、ゴム状弾性材料で筒状に成形された成形品である被検査物Wが取り付けられる検査台1と、この検査台1を駆動させる駆動装置2と、検査台1上の被検査物Wに向けて照明光を照射するLED等による光源3と、被検査物Wの表面からの反射光を受光して撮像する撮像装置4と、検査台1に取り付けられた被検査物Wの内周空間Sへ給気することによりこの被検査物Wを膨張させるエアポンプ5と、被検査物Wの内周空間Sの圧力を計測する圧力計6と、撮像装置4及び圧力計6からのデータに基づいて欠陥の判定を行う演算処理装置7を備える。   FIG. 1 shows a schematic configuration of a defect inspection apparatus according to an embodiment of the present invention. That is, the defect inspection apparatus includes an inspection table 1 to which an inspection object W, which is a molded product formed of a rubber-like elastic material, is attached, a driving device 2 that drives the inspection table 1, and an inspection table 1. A light source 3 such as an LED that irradiates illumination light toward the inspection object W, an imaging device 4 that receives reflected light from the surface of the inspection object W and picks up an image, and an inspection attached to the inspection table 1 The air pump 5 that expands the inspection object W by supplying air to the inner peripheral space S of the object W, the pressure gauge 6 that measures the pressure in the inner peripheral space S of the inspection object W, the imaging device 4 and the pressure gauge 6 includes an arithmetic processing unit 7 that determines a defect based on data from the unit 6.

図示の例において、被検査物Wは、例えば具体的にはダストカバーであり、ゴム状弾性材料(ゴム材料又はゴム状弾性を有する合成樹脂材料)で成形されたものであって、ボールジョイント等における不図示のハウジングの外周面に密接嵌合可能な大径取付部W1と、ボールジョイント等における不図示のボールスタッドの軸部外周面に密接嵌合可能な小径取付部W2と、前記大径取付部W1と小径取付部W2の間を連結する筒状の可撓膜部W3とを備えるものである。   In the illustrated example, the object W to be inspected is specifically a dust cover, which is formed of a rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity), such as a ball joint or the like. A large-diameter mounting portion W1 that can be closely fitted to the outer peripheral surface of the housing (not shown), a small-diameter mounting portion W2 that can be closely fitted to the outer peripheral surface of the shaft portion (not shown) of the ball joint or the like, and the large diameter A cylindrical flexible film portion W3 that connects between the attachment portion W1 and the small-diameter attachment portion W2 is provided.

検査台(ヤトイともいう)1は、駆動装置2によって低速で水平旋回されるターンテーブル11と、このターンテーブル11に回転中心と同心的に立設されたシャフト12と、このシャフト12における下部大径部12aに外挿されると共にセットスクリュ14によって適当な高さに固定される下部取付治具13と、前記シャフト12における上部小径部12bに不図示のセットスクリュ等によって前記下部取付治具13より上方の適当な高さに固定される上部取付治具15を有する。   An inspection table (also referred to as Yatoi) 1 includes a turntable 11 that is horizontally swiveled at a low speed by a drive device 2, a shaft 12 that is erected on the turntable 11 concentrically with the center of rotation, and a large lower portion of the shaft 12. A lower mounting jig 13 which is extrapolated to the diameter portion 12a and fixed to an appropriate height by the set screw 14, and a lower screw 12 which is not shown in the upper small diameter portion 12b of the shaft 12 from the lower mounting jig 13 It has the upper attachment jig | tool 15 fixed to upper suitable height.

そしてこの検査台1は、被検査物W(ダストカバー)を、シャフト12に外挿した状態で、大径取付部W1を下部取付治具13に密接状態で取り付けると共に、小径取付部W2を上部取付治具15に密接状態で取り付けることができるようになっている。   The inspection table 1 has the inspection object W (dust cover) attached to the shaft 12 with the large diameter attachment portion W1 attached to the lower attachment jig 13 in close contact with the small diameter attachment portion W2 at the upper portion. It can be attached to the mounting jig 15 in a close state.

検査台1におけるシャフト12には、一端がエアポンプ5から延びる給気管51に接続されると共に、他端が、下部取付治具13と上部取付治具15に取り付けられた被検査物Wの内周空間Sに開口するエア供給路16が設けられている。このため被検査物Wの内周空間Sには、エアポンプ5によってエアを加圧供給することができるようになっている。なお、エア供給路16は加圧気体供給路に相当するものである。 One end of the shaft 12 in the inspection table 1 is connected to an air supply pipe 51 extending from the air pump 5, and the other end is an inner circumference of the inspection object W attached to the lower mounting jig 13 and the upper mounting jig 15. An air supply path 16 that opens to the space S is provided. Therefore, air can be pressurized and supplied to the inner circumferential space S of the inspection object W by the air pump 5. The air supply path 16 corresponds to a pressurized gas supply path.

また、検査台1における下部取付治具13には、被検査物Wの大径取付部W1との密接位置に沿った環状溝13a及びこの環状溝13aから延びて不図示の真空ポンプに接続される吸気路13bが設けられており、上部取付治具15にも、被検査物Wの小径取付部W2との密接位置に沿った環状溝15a及びこの環状溝15aから延びて前記真空ポンプに接続される吸気路15bが設けられている。すなわち真空ポンプの吸引作用によって、吸気路13b,15bを介して環状溝13a,15aに負圧を導入することで、被検査物Wの大径取付部W1及び小径取付部Wを検査台1における下部取付治具13の上面及び上部取付治具15の下面にしっかりと密着させることができるようになっている。   Further, the lower mounting jig 13 in the inspection table 1 is connected to an annular groove 13a along a close position with the large-diameter mounting portion W1 of the inspection object W and a vacuum pump (not shown) extending from the annular groove 13a. An intake passage 13b is provided, and the upper mounting jig 15 is also connected to the vacuum pump extending from the annular groove 15a along the close position with the small-diameter mounting portion W2 of the inspection object W and the annular groove 15a. An intake passage 15b is provided. That is, by introducing a negative pressure into the annular grooves 13a and 15a through the intake passages 13b and 15b by the suction action of the vacuum pump, the large-diameter mounting portion W1 and the small-diameter mounting portion W of the inspection object W are placed on the inspection table 1. The upper surface of the lower mounting jig 13 and the lower surface of the upper mounting jig 15 can be firmly attached to each other.

撮像装置4は撮像手段であって、被検査物Wの外周面を向いた対物レンズと、この対物レンズによって結像した光をその明暗に応じた電荷に光電変換するCCD又はCMOS等のイメージセンサとを備え、このイメージセンサからの電気信号を画像データとして出力するものである。 The imaging device 4 is a IMAGING means, an objective lens facing the outer peripheral surface of the object W, the image of the CCD or CMOS or the like for photoelectrically converting the electric charge corresponding to the brightness of the light focused by the objective lens And an electric signal from the image sensor is output as image data.

エアポンプ5は給気手段であって、検査台1に取り付けられた被検査物Wの内周空間Sが所定の圧力となるように、給気管51及びエア供給路16を介して前記空間Sへエアを加圧供給するものである。 Air pump 5 is a air supply means, as the inner circumferential space S of the object W mounted on the inspection table 1 becomes a predetermined pressure, into the space S through the supply pipe 51 and the air supply passage 16 Air is supplied under pressure.

圧力計6は圧力計測手段であって、エアポンプ5から供給されるエアによって加圧される被検査物Wの内周空間Sの圧力を計測し、その計測データを出力するものである。 Pressure gauge 6 is a pressure measuring means, the pressure in the inner circumferential space S of the object W to be pressed is measured by the air supplied from the air pump 5, and outputs the measurement data.

演算処理装置7は判定手段であって、例えば汎用のパーソナルコンピュータからなり、モニタディスプレイ、キーボードやマウスなどの入力装置、及び記憶装置を備えている。そしてこの演算処理装置7は所定の処理プログラムに従って、撮像装置4から取り込まれた画像データや、圧力計6からの計測データについて必要な演算処理を行い、設定された閾値などに基づく欠陥判定を行うものである。 Processor 7 is a determine constant means, for example, a general-purpose personal computer, and includes input devices such as a monitor display, a keyboard, a mouse, and a storage device. The arithmetic processing unit 7 performs necessary arithmetic processing on the image data captured from the imaging device 4 and the measurement data from the pressure gauge 6 according to a predetermined processing program, and performs defect determination based on a set threshold value or the like. Is.

上記構成を備える欠陥検査装置を用いたダストカバーなどの被検査物Wの欠陥検査においては、まず被検査物Wを検査台1におけるシャフト12に外挿し、この被検査物Wの大径取付部W1を下部取付治具13に密接嵌合すると共に、小径取付部W2を上部取付治具15に密接嵌合し、その嵌合部に沿った環状溝13a,15aに不図示の真空ポンプによる負圧を導入することによって、被検査物Wの大径取付部W1及び小径取付部W2を検査台1の下部取付治具13及び上部取付治具15にしっかり密着させる。   In defect inspection of an inspection object W such as a dust cover using the defect inspection apparatus having the above-described configuration, first, the inspection object W is extrapolated to the shaft 12 in the inspection table 1, and a large-diameter mounting portion of the inspection object W is provided. W1 is closely fitted to the lower mounting jig 13, and the small-diameter mounting part W2 is closely fitted to the upper mounting jig 15. The annular grooves 13a and 15a along the fitting part are negatively fitted by a vacuum pump (not shown). By introducing the pressure, the large-diameter mounting portion W1 and the small-diameter mounting portion W2 of the inspection object W are firmly attached to the lower mounting jig 13 and the upper mounting jig 15 of the inspection table 1.

また、この被検査物Wの取付過程では、エアポンプ5によって被検査物Wの内周空間Sへエアを加圧供給することで、被検査物Wが膨張されるので、潤滑のための油脂類などを使用しなくてもシャフト12への外挿作業を容易に行うことができ、ひいては検査台1への被検査物Wの取付作業を容易に行うことができる。   Further, in the process of attaching the inspection object W, the inspection object W is expanded by pressurizing and supplying air to the inner circumferential space S of the inspection object W by the air pump 5, so that the oils and fats for lubrication are lubricated. Therefore, the extrapolation work to the shaft 12 can be easily performed without using the above, and the attachment work of the inspection object W to the inspection table 1 can be easily performed.

そして、検査台1の下部取付治具13及び上部取付治具15の環状溝13a,15aに負圧を導入することによって、被検査物Wの大径取付部W1及び小径取付部W2を検査台1の下部取付治具13及び上部取付治具15にしっかり密着させた状態では、前記内周空間Sは密閉空間となっているため、エアの加圧供給によって内周空間Sの内圧が上昇し、これによって被検査物Wが膨張変形される。すなわち被検査物Wとしてのダストカバーは、膨張変形前の状態では例えば図2に示すような外観であるのに対し、被検査物Wの内周空間Sへ所定の圧力値(例えば0.06MPa程度の正圧)となるようにエアを加圧供給することによって、図3に示すように膨らんだ形状となる。   Then, by introducing negative pressure into the annular grooves 13a and 15a of the lower mounting jig 13 and the upper mounting jig 15 of the inspection table 1, the large-diameter mounting part W1 and the small-diameter mounting part W2 of the object W are inspected. In the state where the lower mounting jig 13 and the upper mounting jig 15 are in close contact with each other, the inner circumferential space S is a sealed space, so that the internal pressure of the inner circumferential space S increases due to the pressurized supply of air. Thus, the inspection object W is expanded and deformed. That is, the dust cover as the inspection object W has an appearance as shown in FIG. 2 in a state before the expansion deformation, for example, while a predetermined pressure value (for example, 0.06 MPa) is applied to the inner circumferential space S of the inspection object W. When the air is pressurized and supplied so as to achieve a positive pressure of a certain degree, a swelled shape is obtained as shown in FIG.

そしてこの被検査物Wの表面に、光源3の点灯によって照明光を照射し、駆動装置2によってターンテーブル11を低速で水平旋回させながら、これによってゆっくり旋回する被検査物Wの表面を、1回転の間に撮像装置4が所定の時間間隔で複数回撮像し、これによって全周を撮像し、その画像データを出力する。   The surface of the inspection object W is irradiated with illumination light by turning on the light source 3, and the turntable 11 is horizontally rotated at a low speed by the driving device 2, while the surface of the inspection object W that is slowly rotated is 1 During the rotation, the imaging device 4 captures a plurality of times at a predetermined time interval, thereby capturing the entire circumference and outputting the image data.

撮像装置4から出力される画像データは演算処理装置7に取り込まれ、この演算処理装置7では、画像データを構成する各画素の輝度値をあらかじめ設定した閾値と比較し、輝度値が所定の閾値を超える画素を抽出し、その画素数(面積)によって、欠陥部分であるか、欠陥ではない微小な加工痕などによるものであるかを判定する。   The image data output from the imaging device 4 is taken into the arithmetic processing unit 7, and the arithmetic processing unit 7 compares the luminance value of each pixel constituting the image data with a preset threshold value, and the luminance value is a predetermined threshold value. The number of pixels exceeding 1 is extracted, and it is determined by the number of pixels (area) whether it is a defective portion or a minute processing trace that is not a defect.

そして、膨張変形前の状態では図2に示すように、比較的大きな欠陥A1は顕在化しているのに対し、欠陥部分A2,A3は傷や亀裂などの部分が閉じた状態にあるために画像データに顕在化されないが、本発明の欠陥検査装置では、図3に示すように被検査物Wを膨張させることで、前記欠陥部分A2,A3が開くように拡張されるので、従来の技術では検出できなかった閉じた欠陥も撮像手段4による画像データに顕在化され、検出可能となる。   In the state before the expansion deformation, as shown in FIG. 2, the relatively large defect A1 is obvious, whereas the defect portions A2 and A3 are in a state in which the portions such as scratches and cracks are closed. Although not revealed in the data, in the defect inspection apparatus of the present invention, the defect portions A2 and A3 are expanded to open by expanding the inspection object W as shown in FIG. The closed defect that could not be detected is also manifested in the image data by the imaging means 4 and can be detected.

一方、被検査物Wの内周空間Sの圧力は圧力計6により計測されており、その計測データが演算処理装置7に取り込まれている。もし、欠陥部分Aが浅く、被検査物Wをその厚さ方向へ貫通しないものであれば、前記内周空間Sの圧力はあらかじめ設定された時間以内に所定の圧力値に達し、エアポンプ5によるエアの加圧供給を停止した後も、内周空間Sの圧力が維持されるが、欠陥部分Aが被検査物Wをその厚さ方向へ貫通したものであれば、供給されたエアは貫通欠陥から外部へ漏れ、被検査物Wの内周空間Sの圧力はあらかじめ設定された時間以内に所定の圧力値に達しない(被検査物Wが所定の大きさに膨らまない)ことになる。あるいは所定の圧力値に上昇させても、エアポンプ5によるエアの加圧供給を停止すると、内周空間Sの圧力が経時的に低下していくことになる。   On the other hand, the pressure in the inner circumferential space S of the inspection object W is measured by the pressure gauge 6, and the measurement data is taken into the arithmetic processing device 7. If the defect portion A is shallow and does not penetrate the inspection object W in the thickness direction, the pressure in the inner circumferential space S reaches a predetermined pressure value within a preset time, and is caused by the air pump 5. Even after the pressure supply of air is stopped, the pressure in the inner circumferential space S is maintained. However, if the defective portion A penetrates the workpiece W in the thickness direction, the supplied air penetrates. The defect leaks to the outside, and the pressure in the inner circumferential space S of the inspection object W does not reach a predetermined pressure value within a preset time (the inspection object W does not expand to a predetermined size). Or even if it raises to a predetermined pressure value, if the pressurization supply of the air by the air pump 5 will be stopped, the pressure of the inner peripheral space S will fall over time.

したがって、圧力計6による計測データから、欠陥部分Aが非貫通のものであるか貫通したものであるかを判別し、例えば撮像装置4からの画像データにより検出された欠陥部分が設定値より小さいものであっても貫通した欠陥であると判別された場合や、非貫通であると判別された場合でも撮像装置4からの画像データにより検出された欠陥部分の面積が設定値を超えた大きさである場合(亀裂の成長により貫通してしまうおそれのある欠陥)をNGとし、画像データにより検出された欠陥部分が設定値より小さくかつ非貫通であると判別された場合に良品とするなどの論理回路を構成することができる。   Therefore, it is determined from the measurement data obtained by the pressure gauge 6 whether the defective portion A is non-penetrating or penetrating, and the defective portion detected by, for example, image data from the imaging device 4 is smaller than the set value. Even if it is determined that the defect is a penetrating defect or a non-penetrating defect, the size of the defect portion detected by the image data from the imaging device 4 exceeds the set value. (Defects that may penetrate due to crack growth) are judged as NG, and defective parts detected by image data are smaller than a set value and judged as non-penetrating, etc. A logic circuit can be configured.

そして本発明によれば、撮像装置4からの画像データのみによる検査でも、あるいは画像データによらず圧力計6による漏れ検出のみによる検査でも検出できなかった欠陥を検出することができる。   According to the present invention, it is possible to detect a defect that could not be detected by inspection only by image data from the imaging device 4 or by inspection only by leak detection by the pressure gauge 6 regardless of image data.

なお、検査台1の下部取付治具13及び上部取付治具15の環状溝13a,15bの負圧を解除して検査台1から被検査物Wを取り外す際にも、エアポンプ5によって被検査物Wの内周空間Sへエアを加圧供給することで、取付時と同様に、作業を容易に行うことができる。   Note that the object to be inspected is also removed by the air pump 5 when the object W is removed from the inspection table 1 by releasing the negative pressure in the annular grooves 13a and 15b of the lower mounting tool 13 and the upper mounting tool 15 of the inspection table 1. By pressurizing and supplying air to the inner circumferential space S of W, work can be easily performed as in the case of attachment.

次に図4は、本発明の他の実施の形態による欠陥検査装置の概略構成を示すものである。この欠陥検査装置において、図1に示す実施の形態と異なるところは、検査台1がシャフト12を備えておらず、エアポンプ5による被検査物Wの内周空間Sへのエアの加圧供給が、下部取付治具13(又は上部取付治具15)に設けられたエア供給路16から行われるようになっていることにある。   Next, FIG. 4 shows a schematic configuration of a defect inspection apparatus according to another embodiment of the present invention. In this defect inspection apparatus, the difference from the embodiment shown in FIG. 1 is that the inspection table 1 does not include the shaft 12, and the air pump 5 supplies pressurized air to the inner circumferential space S of the inspection object W. In other words, the air supply path 16 is provided in the lower mounting jig 13 (or the upper mounting jig 15).

詳しくは、検査台1における下部取付治具13には、被検査物Wの大径取付部W1の上側の首部を外嵌可能な円柱状の凸部13cが形成され、上部取付治具15にも同様に、被検査物Wの小径取付部W2の下側の首部を外嵌可能な円柱状の凸部15cが形成されており、この嵌合状態で、不図示の真空ポンプの吸引作用によって、吸気路13b,15bを介して環状溝13a,15aに負圧を導入することで、被検査物Wの大径取付部W1及び小径取付部Wを検査台1における下部取付治具13の上面及び上部取付治具15の下面にしっかりと密着させることができるようになっている。その他の構成は、基本的に図1と同等とすることができる。   Specifically, the lower mounting jig 13 in the inspection table 1 is formed with a columnar convex portion 13c that can be fitted over the upper neck portion of the large-diameter mounting portion W1 of the object W to be inspected. Similarly, a columnar convex portion 15c is formed in which the lower neck portion of the small-diameter mounting portion W2 of the inspection object W can be fitted, and in this fitted state, by a suction action of a vacuum pump (not shown). By introducing negative pressure into the annular grooves 13a and 15a via the intake passages 13b and 15b, the large-diameter mounting portion W1 and the small-diameter mounting portion W of the inspection object W are placed on the upper surface of the lower mounting jig 13 in the inspection table 1. In addition, the upper mounting jig 15 can be firmly attached to the lower surface. Other configurations can be basically the same as those in FIG.

1 検査台
16 エア供給路(加圧気体供給路)
3 光源
4 撮像装置
5 エアポンプ(給気手段)
6 圧力計(圧力計測手段)
7 演算処理装置(判定手段)
S 内周空間
W 被検査物
1 Inspection table 16 Air supply path (Pressurized gas supply path)
3 Light source 4 Imaging device 5 Air pump (air supply means)
6 Pressure gauge (pressure measuring means)
7. Arithmetic processing device (determination means)
S Inner space W Inspected object

Claims (3)

ゴム状弾性材料で成形され少なくとも一端が開口された筒状の被検査物の欠陥を検査する装置であって、
前記被検査物を嵌着する検査台と、
前記被検査物の内周空間へこの内周空間が所定の圧力値となるように給気することによりこの被検査物を膨張させる給気手段と、
前記被検査物の表面を撮像する撮像手段と、
この撮像手段からの画像データを構成する各画素の輝度値をあらかじめ設定された閾値と比較し、輝度値が所定の閾値を超える画素の面積に基づいて欠陥部分の有無を判定する判定手段と、
を備えることを特徴とする成形品の欠陥検査装置。
An apparatus for inspecting a defect of a cylindrical inspection object formed of a rubber-like elastic material and having at least one end opened,
An inspection table for fitting the inspection object;
An air supply means for inflating the test object by supplying air to the inner peripheral space of the test object so that the inner peripheral space has a predetermined pressure value ;
Imaging means for imaging the surface of the inspection object;
A determination unit that compares the luminance value of each pixel constituting the image data from the imaging unit with a preset threshold value and determines the presence or absence of a defective portion based on the area of the pixel whose luminance value exceeds a predetermined threshold value ;
A defect inspection apparatus for a molded product, comprising:
被検査物の内周空間の圧力を検出する圧力計測手段を備え、
前記判定手段が、前記圧力計測手段による計測値に基づいて欠陥部分が貫通しているか非貫通かを判定する
ことを特徴とする請求項1に記載の成形品の欠陥検査装置。
A pressure measuring means for detecting the pressure in the inner space of the object to be inspected;
2. The defect inspection apparatus for a molded product according to claim 1, wherein the determination unit determines whether the defective portion is penetrating or not penetrating based on a measurement value obtained by the pressure measuring unit.
被検査物の内周空間への給気が、前記被検査物を嵌着する前記検査台に設けられた加圧気体供給路を介して行われる
ことを特徴とする請求項1又は2に記載の成形品の欠陥検査装置。
Air supply to the inner peripheral space of the object to be inspected, wherein said in claim 1 or 2, characterized in that takes place via a pressurized gas supply passage provided in the inspection station for fitting the object to be inspected Defect inspection equipment for molded products.
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