JP2008185462A - Method and apparatus for judging quality of screw - Google Patents

Method and apparatus for judging quality of screw Download PDF

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JP2008185462A
JP2008185462A JP2007019399A JP2007019399A JP2008185462A JP 2008185462 A JP2008185462 A JP 2008185462A JP 2007019399 A JP2007019399 A JP 2007019399A JP 2007019399 A JP2007019399 A JP 2007019399A JP 2008185462 A JP2008185462 A JP 2008185462A
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screw
area
reflected light
healthy
region
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Daisuke Sakuma
大祐 佐久間
Noriyuki Ueno
紀幸 上野
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Toyota Motor Corp
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Toyota Motor Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a quality judging method of a screw capable of judging whether prescribed torque is ensured with high precision, and a quality judging apparatus of the screw. <P>SOLUTION: The length of the screw directly connected with whether the prescribed torque can be produced is replaced with the healthy region (OK region) of the ridge parts of a screw part proportional to the length of the screw and the healthy region of the ridge parts of the screw part is extracted on the basis of the reflection intensity of the laser beam applied to the screw part to be formed into an image. On the basis of the extracted image of the healthy region, the area of the healthy region is compared with the whole area of the screw part and, in the case where it is identified that the healthy region ensures the area necessary for the occurrence of the prescribed torque, a screw hole is judged to be good (OK). By this constitution, it can be judged whether the prescribed torque is ensured with high precision. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、ねじ良否判定方法及びねじ良否判定装置に関するもので、特に、ねじ穴の良否判定を行う方法及び装置に関する。   The present invention relates to a screw pass / fail determination method and a screw pass / fail determination device, and more particularly, to a method and an apparatus for determining screw hole pass / fail.

ねじは、規定トルクで締付けることが要求される。言い換えると、ねじは、規定トルクを発生させるだけのねじ長が確保されている必要がある。ねじに欠陥が存在すると、規定トルクを発生させることができない虞があるため、ねじの良否判定に係る技術が数多く実用化されている。例えば、特許文献１には、ねじ穴の内周面の画像をＣＣＤカメラによって取込み、該取込まれた画像を２値化して閾値以上の濃度の部分を抽出し、該抽出された部分における、ねじ穴の軸方向の所定距離内に存在する連続部分の数、あるいは、ねじ穴の軸方向の所定距離内に所定ピッチを維持して存在するピークの数、を計数し、該計数値と基準値とを比較することにより、ねじ穴の欠陥を検出するねじ穴の欠陥検出方法が開示されている。このように、従来技術においては、取込まれたねじ部の画像に基きねじの良否判定が実施されるため、ねじ部の欠陥部分と谷部との明確な判別が困難であり、誤判定を生じ易い。また、従来技術は、欠陥部分を検出してねじの良否を判定する間接的計測による判定であり、ねじ長を直接的に計測するものではないことから、良であると判定されたねじであっても規定トルクが確保されているか否かが定かではない。
特開平１０−７３４１８号公報 The screw is required to be tightened with a specified torque. In other words, the screw needs to have a screw length sufficient to generate a specified torque. If there is a defect in the screw, there is a possibility that the specified torque cannot be generated. Therefore, many techniques relating to the screw quality determination have been put into practical use. For example, in Patent Document 1, an image of an inner peripheral surface of a screw hole is captured by a CCD camera, and the captured image is binarized to extract a portion having a density equal to or higher than a threshold value. In the extracted portion, The number of continuous portions existing within a predetermined distance in the axial direction of the screw hole or the number of peaks existing within a predetermined distance in the axial direction of the screw hole while maintaining a predetermined pitch is counted. A screw hole defect detection method for detecting a screw hole defect by comparing the values is disclosed. Thus, in the prior art, since the quality of the screw is determined based on the captured image of the screw part, it is difficult to clearly determine the defective part and the valley part of the screw part, and erroneous determination is made. It is likely to occur. In addition, the prior art is a determination based on indirect measurement that determines the quality of a screw by detecting a defective portion, and does not directly measure the screw length. However, it is not certain whether the specified torque is secured.
Japanese Patent Laid-Open No. 10-73418

そこで本発明は、上記事情に鑑みてなされたもので、規定トルクが確保されているか否かを高い精度で判定することが可能なねじ良否判定方法及びねじ良否判定装置を提供することを課題としてなされたものである。   Therefore, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a screw pass / fail determination method and a screw pass / fail determination device capable of determining with high accuracy whether or not a prescribed torque is secured. It was made.

上記課題を解決するために、本発明のねじ良否判定方法は、ねじ部に照射したレーザ光の反射光の強度を測定する測定ステップと、測定ステップによって測定された反射光強度に基いて、山部、傾斜部、谷部に分画されたねじ部の展開画像を作像する作像ステップと、作像ステップによって作像されたねじ部の展開画像の一軸断面の反射光強度データを抽出し、抽出された反射光強度データに基いてねじ部の一軸断面の山部を健全領域と不健全領域とに分画する分画ステップと、分画ステップをねじ部の展開画像の全面について実行し、全断面の山部の健全領域のみを抽出して画像化する抽出ステップと、抽出ステップによって抽出された山部の健全領域の画像に基いてねじ部の良否を判定する判定ステップと、によって構成されることを特徴とする。
本発明のねじ良否判定方法によれば、従来のねじ良否判定方法のようにねじ部の欠陥部分を検出し、該検出結果に基いて規定トルクを発生させることができるか否か（ねじの良否）を間接的に判定するのではなく、規定トルクを発生させることができるか否かに直接的に係るねじ部の山部の健全領域を、ねじ部に照射したレーザ光の反射光の強度に基いて抽出及び画像化し、該ねじ部の山部の健全部の画像に基いてねじの良否を判定するので、規定トルクが確保されているか否かを判定する上で信頼性が高いねじ良否判定方法を提供することができる。 In order to solve the above-described problems, the screw pass / fail judgment method of the present invention includes a measuring step for measuring the intensity of reflected light of laser light irradiated on a screw portion, and a peak based on the reflected light intensity measured by the measuring step. An image forming step for forming a developed image of a screw part divided into a head part, an inclined part, and a valley part, and reflected light intensity data of a uniaxial cross section of the developed image of the screw part formed by the image forming step are extracted. A fractionation step for dividing the ridge of the uniaxial cross section of the screw portion into a healthy region and an unhealthy region based on the extracted reflected light intensity data, and a fractionation step are performed on the entire developed image of the screw portion. An extraction step for extracting and imaging only the healthy region of the mountain portion of the entire cross section, and a determination step for determining the quality of the screw portion based on the image of the healthy region of the mountain portion extracted by the extraction step To be special To.
According to the screw pass / fail judgment method of the present invention, it is possible to detect a defective portion of the screw portion as in the conventional screw pass / fail judgment method, and to determine whether or not the specified torque can be generated based on the detection result. ) Is not indirectly determined, but the sound region of the threaded portion of the screw portion directly related to whether or not the specified torque can be generated is set to the intensity of the reflected light of the laser beam irradiated to the screw portion. Extraction and imaging based on this, and determining the quality of the screw based on the image of the healthy part of the threaded portion of the threaded portion, so it is highly reliable in determining whether the specified torque is secured or not A method can be provided.

上記課題を解決するために、本発明のねじ良否判定装置は、ねじ部に向けてレーザ光を照射する投光手段と、投光手段から照射したレーザ光の反射光を受光する受光手段と、受光手段によって受光した反射光の強度を測定する測定手段と、測定手段によって測定された反射光の強度に基いて山部、傾斜部、谷部に分画されたねじ部の展開画像を作像する作像手段と、作像手段によって作像されたねじ部の展開画像の一軸断面の反射光強度データを抽出し、抽出された反射光強度データに基いてねじ部の一軸断面の山部を健全領域と不健全領域とに分画する分画手段と、ねじ部の展開画像の全面の山部の健全領域のみを抽出して画像化する抽出手段と、抽出手段によって抽出及び画像化された山部の健全領域の画像に基いてねじ部の良否を判定する判定手段と、を具備することを特徴とする。
本発明のねじ良否判定装置によれば、従来のねじ良否判定装置のようにねじ部の欠陥部分を検出し、該検出結果に基いて規定トルクを発生させることができるか否か（ねじの良否）を間接的に判定するのではなく、規定トルクを発生させることができるか否かに直接的に係るねじ長を、該ねじ長に比例するねじ部の山部の健全領域（ＯＫ領域）に置き換え、このねじ部の山部の健全領域を、ねじ部に照射したレーザ光の反射光の強度に基いて抽出及び画像化し、該ねじ部の山部の健全部の画像に基いてねじの良否を判定する、又は山部の健全部の画像から健全なねじ長を算出するので、規定トルクが確保されているか否かを判定する上で信頼性が高いねじ良否判定方法を提供することができる。 In order to solve the above-described problem, a screw quality determination device according to the present invention includes a light projecting unit that irradiates a laser beam toward a screw portion, a light receiving unit that receives reflected light of the laser beam emitted from the light projecting unit, and A measuring means for measuring the intensity of the reflected light received by the light receiving means, and a developed image of the screw part divided into the peak portion, the inclined portion, and the valley portion based on the intensity of the reflected light measured by the measuring means. And the reflected light intensity data of the uniaxial cross section of the developed image of the screw portion imaged by the image forming means, and the peak portion of the uniaxial cross section of the screw portion is extracted based on the extracted reflected light intensity data. Fractionation means for separating into healthy areas and unhealthy areas, extraction means for extracting and imaging only the sound areas of the entire mountain area of the developed image of the screw part, and extracted and imaged by the extraction means Judgment of threaded part based on the image of the healthy area of the mountain Characterized by comprising a that judging means.
According to the screw pass / fail judgment device of the present invention, it is possible to detect a defective portion of a screw part as in the conventional screw pass / fail judgment device and generate a specified torque based on the detection result (screw pass / fail judgment). ) Is not indirectly determined, but the screw length directly related to whether or not the specified torque can be generated is set to a healthy region (OK region) of the threaded portion of the screw portion proportional to the screw length. Replace and image the sound region of the threaded portion of the threaded portion based on the intensity of the reflected light of the laser light irradiated to the threaded portion, and determine whether the screw is good or not based on the image of the sounded portion of the threaded portion of the threaded portion. Or calculating a sound screw length from an image of a healthy portion of a mountain portion, and therefore, it is possible to provide a reliable screw quality determination method for determining whether or not a specified torque is secured. .

（発明の態様）
以下に、本願において特許請求が可能と認識されている発明（以下、請求可能発明と称する）の態様を例示し、例示された各態様について説明する。ここでは、各態様を、特許請求の範囲と同様に、項に区分すると共に各項に番号を付し、必要に応じて他の項の記載を引用する形式で記載する。これは、請求可能発明の理解を容易にするためであり、請求可能発明を構成する構成要素の組み合わせを、以下の各項に記載されたものに限定する趣旨ではない。つまり、請求可能発明は、各項に付随する記載、実施形態の記載等を参酌して解釈されるべきであり、その解釈に従う限りにおいて、各項の態様にさらに他の構成要素を付加した態様も、また、各項の態様から構成要素を削除した態様も、請求可能発明の一態様となり得る。
なお、以下の各項において、（１）〜（４）項の各々が、請求項１〜４の各々に相当する。 (Aspect of the Invention)
In the following, aspects of the invention that is recognized as being capable of being claimed in the present application (hereinafter referred to as claimable invention) will be exemplified, and each exemplified aspect will be described. Here, as in the claims, each aspect is divided into paragraphs, numbers are assigned to the respective paragraphs, and the descriptions of other paragraphs are cited as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combination of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiment, etc., and as long as the interpretation is followed, another aspect is added to the aspect of each section. Moreover, the aspect which deleted the component from the aspect of each term can also be one aspect of the claimable invention.
In the following items, each of items (1) to (4) corresponds to each of claims 1 to 4.

（１）ねじ部に照射したレーザ光の反射光の強度を測定する測定ステップと、測定ステップによって測定された反射光強度に基いて、山部、傾斜部、谷部に分画されたねじ部の展開画像を作像する作像ステップと、作像ステップによって作像されたねじ部の展開画像の一軸断面の反射光強度データを抽出し、抽出された反射光強度データに基いてねじ部の一軸断面の山部を健全領域と不健全領域とに分画する分画ステップと、分画ステップをねじ部の展開画像の全面について実行し、全断面の山部の健全領域のみを抽出して画像化する抽出ステップと、抽出ステップによって抽出された山部の健全領域の画像に基いてねじ部の良否を判定する判定ステップと、によって構成されることを特徴とするねじ良否判定方法。
本項に記載のねじ良否判定方法によれば、従来のねじ良否判定方法のように、ねじ部の欠陥部分を検出し、該検出結果に基いて規定トルクを発生させることができるか否か（ねじの良否）を間接的に判定するのではなく、規定トルクを発生させることができるか否かに直接的に係るねじ長を、該ねじ長に比例するねじ部の山部の健全領域（ＯＫ領域）に置き換え、このねじ部の山部の健全領域をねじ部に照射したレーザ光の反射光の強度に基いて抽出及び画像化し、該ねじ部の山部の健全部の画像に基いてねじの良否を判定する、又は山部の健全領域からねじ長を算出して良否を判定するので、規定トルクが確保されているか否かを高い精度で判定することができる。
本項の態様では、例えば、ねじ穴の良否を判定する場合、レーザ光を投受光可能な計測プローブを判定対象となるねじ穴に挿入し、該計測プローブを軸方向へ移動させてレーザ光を軸方向に対して平行なラインに沿ってねじ穴に投受光することにより、当該ラインにおける反射光強度を測定する。そして、ねじ穴の軸線回りの計測された全ライン（L1,L2,・・・,Ln）について反射光強度を測定し、全ラインの反射光強度データに基いてねじ穴の周方向に沿った展開画像を作像する。このねじ穴の展開画像は、例えば、山部を白色、傾斜部を黒色、谷部を灰色で作像されて出力される。次に、展開画像上の一ラインL1の反射光強度データを抽出し、該反射光強度データをノイズフィルタで処理してパルス列に加工する。そして、該パルス列に加工された反射光強度データを、最低必要ねじ山高さの反射光強度を閾値として健全領域（ＯＫ領域）と不健全領域（ＮＧ領域）とに分画する。この分画処理を全ライン（L1,L2,・・・,Ln）について実施し、全ライン（L1,L2,・・・,Ln）の分画処理結果の積算データから健全領域のみを抽出して画像化する。そして、抽出された健全領域の画像に基いてねじ穴の良否が判定される。ここで、ライン数を表すｎは、プローブの回転スピードや軸方向の送り速度によって変化する。また、本項では、L1,L2,・・・,Lnの全ラインを軸方向で抽出して強度測定を行っているが、全ラインを軸方向でのみ抽出する必要はなく、全ラインを軸方向に対して垂直な方向又は斜め方向で抽出して強度測定を行っても、同様の処理が可能となる。その理由は、計測データの全てにおいて強度を測定する点で同じであるからである。このように、抽出ラインは、必要に応じていかなる方向にも選択することができる。
また、本項の態様では、例えば、山部の健全領域を抽出した画像から、又はねじ部の展開画像からねじピッチの算出が可能となる。この場合、山部の健全領域を抽出した画像から各山部の間隔を計測することによりねじピッチを算出することができる。そして、算出したねじピッチと規定ねじピッチとを比較することにより、ねじ寸法の良否を判定することができる。 (1) A measurement step for measuring the intensity of the reflected light of the laser light applied to the threaded portion, and a threaded portion divided into a peak portion, an inclined portion, and a valley portion based on the reflected light intensity measured by the measuring step The image forming step for forming the developed image of the image, and the reflected light intensity data of the uniaxial cross section of the developed image of the screw portion formed by the image forming step are extracted, and the screw portion of the screw portion is extracted based on the extracted reflected light intensity data. Fractionation step to divide the ridge of the uniaxial section into a healthy area and an unhealthy area, and execute the fractionation step on the entire developed image of the screw part to extract only the healthy area of the ridge of the entire section A screw pass / fail judgment method comprising: an extraction step for imaging, and a judgment step for judging pass / fail of a screw portion based on an image of a healthy region of a mountain extracted by the extraction step.
According to the screw quality determination method described in this section, it is possible to detect a defective portion of the screw portion and generate a specified torque based on the detection result as in the conventional screw quality determination method ( The thread length directly related to whether or not the specified torque can be generated is not indirectly determined as to whether the screw is good or bad, and the sound region (OK) of the threaded portion of the thread portion proportional to the screw length. The sound region of the threaded portion of the threaded portion is extracted and imaged based on the intensity of the reflected light of the laser light applied to the threaded portion, and the screw is formed based on the image of the sounded portion of the threaded portion of the threaded portion. Therefore, it is possible to determine whether or not the prescribed torque is ensured with high accuracy.
In the aspect of this section, for example, when determining the quality of a screw hole, a measurement probe capable of projecting and receiving laser light is inserted into a screw hole to be determined, and the laser probe is moved by moving the measurement probe in the axial direction. By projecting and receiving light into the screw hole along a line parallel to the axial direction, the reflected light intensity at the line is measured. Then, the reflected light intensity is measured for all the lines (L1, L2,..., Ln) measured around the axis of the screw hole, and along the circumferential direction of the screw hole based on the reflected light intensity data of all the lines. Create a developed image. The unfolded image of the screw hole is output, for example, with a mountain portion being white, an inclined portion being black, and a valley portion being gray. Next, the reflected light intensity data of one line L1 on the developed image is extracted, and the reflected light intensity data is processed by a noise filter and processed into a pulse train. Then, the reflected light intensity data processed into the pulse train is divided into a healthy area (OK area) and an unhealthy area (NG area) using the reflected light intensity of the minimum necessary thread height as a threshold value. This fraction processing is performed for all lines (L1, L2, ..., Ln), and only the healthy area is extracted from the integrated data of the fraction processing results for all lines (L1, L2, ..., Ln). Image. And the quality of a screw hole is determined based on the image of the extracted healthy area | region. Here, n representing the number of lines varies depending on the rotational speed of the probe and the feed rate in the axial direction. In this section, all lines L1, L2,..., Ln are extracted in the axial direction to measure the intensity. However, it is not necessary to extract all the lines only in the axial direction. Even if the intensity measurement is performed by extracting in a direction perpendicular to the direction or in an oblique direction, the same processing can be performed. The reason is that it is the same in that the intensity is measured in all the measurement data. Thus, the extraction line can be selected in any direction as required.
Moreover, in the aspect of this term, for example, it is possible to calculate the screw pitch from an image obtained by extracting a healthy region of a mountain or from a developed image of a screw. In this case, the screw pitch can be calculated by measuring the interval between the peaks from an image obtained by extracting the healthy areas of the peaks. And the quality of a screw dimension can be determined by comparing the calculated screw pitch with a specified screw pitch.

（２）判定ステップは、山部の健全領域の面積とねじ部全体の面積とを比較して、ねじ部が規定トルクを発生するのに必要な健全領域を確保しているか否かの判定基準に基いてねじ部の良否を判定する、又は山部の健全領域の面積から算出された健全なねじ長と規定トルクに必要なねじ長とを比較して良否を判定する（１）のねじ良否判定方法。
本項に記載の態様では、（１）において抽出された健全領域の画像に基いて山部の健全領域の面積とねじ穴（ねじ部）全体の面積とを比較し、山部の健全領域が規定トルクを発生するのに必要な面積を確保しているか否かを判別する、又は山部の健全領域の面積から算出された健全なねじ長と規定トルクに必要なねじ長とを比較して良否を判定する。そして、山部の健全領域が規定トルクを発生するのに必要な面積を確保していると判別された場合、又は山部の健全領域が規定トルクを発生するのに必要なねじ長を確保していると判別された場合、ねじ穴が良（ＯＫ）であると判定され、山部の健全領域が規定トルクを発生するのに必要な面積を確保していないと判別された場合、又は山部の健全領域が規定トルクを発生するのに必要なねじ長を確保していないと判別された場合、ねじ穴が不良（ＮＧ）であると判定される。したがって、本項の態様によれば、ねじ（ねじ穴）が規定トルクを発生させることができるか否かを高い精度で判定することが可能である。 (2) The determination step compares the area of the healthy area of the peak with the area of the entire screw section, and determines whether or not the screw section has secured a healthy area necessary for generating the specified torque. (1) Screw quality is judged by comparing the sound screw length calculated from the area of the healthy area of the mountain portion with the screw length necessary for the specified torque. Judgment method.
In the aspect described in this section, the area of the healthy area of the mountain portion and the area of the entire screw hole (screw portion) are compared based on the image of the healthy area extracted in (1), and the healthy area of the mountain portion is Determine whether the area required to generate the specified torque is secured, or compare the healthy screw length calculated from the area of the healthy area of the mountain with the screw length required for the specified torque. Judge the quality. Then, when it is determined that the sound area of the mountain portion secures an area necessary for generating the specified torque, or the screw length necessary for the sound region of the mountain portion to generate the specified torque is secured. If it is determined that the screw hole is good (OK), and it is determined that the sound area of the peak portion does not secure the area necessary for generating the specified torque, or the peak When it is determined that the sound region of the portion does not secure the screw length necessary for generating the specified torque, the screw hole is determined to be defective (NG). Therefore, according to the aspect of this section, it is possible to determine with high accuracy whether or not the screw (screw hole) can generate the specified torque.

（３）ねじ部に向けてレーザ光を照射する投光手段と、投光手段から照射したレーザ光の反射光を受光する受光手段と、受光手段によって受光した反射光の強度を測定する測定手段と、測定手段によって測定された反射光の強度に基いて山部、傾斜部、谷部に分画されたねじ部の展開画像を作像する作像手段と、作像手段によって作像されたねじ部の展開画像の一軸断面の反射光強度データを抽出し、抽出された反射光強度データに基いてねじ部の一軸断面の山部を健全領域と不健全領域とに分画する分画手段と、ねじ部の展開画像の全断面の山部の健全領域のみを抽出して画像化する抽出手段と、抽出手段によって抽出及び画像化された山部の健全領域の画像に基いてねじ部の良否を判定する判定手段と、を具備することを特徴とするねじ良否判定装置。
本項に記載のねじ良否判定装置によれば、例えば、ねじ穴の良否を判定する場合、投光手段と受光手段とを備える計測プローブが判定対象となるねじ穴に挿入される。この計測プローブが軸方向へ回転しながら移動され、レーザ光が軸方向に対して平行なラインに沿ってねじ穴に投受光される。受光手段によって受光した反射光はその反射光強度が測定手段によって測定される。そして、測定手段によってねじ穴の軸線回りの全ライン（L1,L2,・・・,Ln）について反射光強度が測定され、全ラインの反射光強度データに基いて作像手段によってねじ穴の周方向に沿った展開画像が作像される。作像手段によって作像された展開画像は、例えば、山部を白色、傾斜部を黒色、谷部を灰色で作像されて出力される。そして、展開画像上の一ラインL1の反射光強度データが抽出され、該反射光強度データがノイズフィルタによって処理されてパルス列に加工される。このパルス列に加工された反射光強度データは、分画手段によって最低必要ねじ山高さの反射光強度を閾値として健全領域（ＯＫ領域）と不健全領域（ＮＧ領域）とに分画される。そして、分画手段による分画処理が全ライン（L1,L2,・・・,Ln）について実施され、全ライン（L1,L2,・・・,Ln）の分画処理結果の積算データから健全領域のみが抽出手段によって抽出されて画像化される。そして、抽出手段によって抽出された健全領域の画像に基いて判定手段によってねじ穴の良否が判定される。 (3) Light projecting means for irradiating laser light toward the screw portion, light receiving means for receiving reflected light of the laser light emitted from the light projecting means, and measuring means for measuring the intensity of the reflected light received by the light receiving means And image forming means for forming a developed image of the thread portion divided into a peak portion, an inclined portion, and a valley portion based on the intensity of the reflected light measured by the measuring means, and an image formed by the image forming means Fractionation means for extracting reflected light intensity data of a uniaxial cross section of a developed image of a screw part and fractionating a peak part of the uniaxial cross section of the screw part into a healthy area and an unhealthy area based on the extracted reflected light intensity data And extracting means for extracting and imaging only the sound areas of the crests of the entire cross section of the developed image of the screw parts, and the screw parts based on the images of the sound areas of the crests extracted and imaged by the extracting means A screw comprising: determination means for determining pass / fail Determination device.
According to the screw quality determination device described in this section, for example, when determining the quality of a screw hole, a measurement probe including a light projecting unit and a light receiving unit is inserted into a screw hole to be determined. The measurement probe is moved while rotating in the axial direction, and the laser beam is projected and received in the screw hole along a line parallel to the axial direction. The reflected light intensity received by the light receiving means is measured by the measuring means. Then, the reflected light intensity is measured for all the lines (L1, L2,..., Ln) around the axis of the screw hole by the measuring means, and the circumference of the screw hole is measured by the imaging means based on the reflected light intensity data of all the lines. A developed image along the direction is created. The developed image formed by the image forming means is output with, for example, a mountain portion being white, an inclined portion being black, and a valley portion being gray. Then, the reflected light intensity data of one line L1 on the developed image is extracted, and the reflected light intensity data is processed by a noise filter and processed into a pulse train. The reflected light intensity data processed into the pulse train is fractionated into a healthy region (OK region) and an unhealthy region (NG region) by using the reflected light intensity of the minimum necessary thread height as a threshold value by the fractionating means. Then, the fractionation processing by the fractionation means is performed for all lines (L1, L2,..., Ln), and the sound is obtained from the integrated data of the fraction processing results for all lines (L1, L2,..., Ln). Only the area is extracted and imaged by the extraction means. And the quality of a screw hole is determined by a determination means based on the image of the healthy area extracted by the extraction means.

（４）判定手段は、山部の健全領域の面積とねじ部全体の面積とを比較して、ねじ部が規定トルクを発生するのに必要な健全領域を確保しているか否かの判定基準に基いてねじ部の良否を判定する、又は山部の健全領域の面積から算出された健全なねじ長と規定トルクに必要なねじ長とを比較して良否を判定する（３）のねじ良否判定装置。
本項の態様によれば、判定手段は、抽出手段によって抽出された健全領域の画像に基いて山部の健全領域の面積とねじ穴（ねじ部）全体の面積とを比較し、山部の健全領域が規定トルクを発生するのに必要な面積を確保しているか否かを判定する、又は山部の健全領域の面積から算出された健全なねじ長と規定トルクに必要なねじ長とを比較して良否を判定する。そして、判定手段は、山部の健全領域が規定トルクを発生するのに必要な面積を確保している場合に、又は山部の健全領域が規定トルクを発生するのに必要なねじ長を確保している場合に、ねじ穴が良（ＯＫ）であると判定し、山部の健全領域が規定トルクを発生するのに必要な面積を確保していない場合に、又は山部の健全領域が規定トルクを発生するのに必要なねじ長を確保していない場合に、ねじ穴が不良（ＮＧ）であると判定する。したがって、本項の態様によれば、ねじ（ねじ穴）が規定トルクを発生させることができるか否かを高い精度で判定することが可能である。 (4) The judging means compares the area of the healthy area of the mountain with the area of the entire threaded part, and judges whether or not the threaded part has secured the healthy area necessary for generating the specified torque. The quality of the screw part is judged based on the above, or the quality of the screw is judged by comparing the healthy screw length calculated from the area of the healthy area of the mountain with the screw length necessary for the specified torque (3) Judgment device.
According to the aspect of this section, the determination means compares the area of the healthy area of the mountain portion with the area of the entire screw hole (screw portion) based on the image of the healthy area extracted by the extracting means, Determine whether the sound area has sufficient area to generate the specified torque, or calculate the sound screw length calculated from the area of the sound area of the mountain and the screw length required for the specified torque. The quality is determined by comparison. And the determination means secures the screw length necessary for the sound area of the mountain portion to generate the specified torque, or when the sound area of the mountain portion generates the specified torque. If the screw hole is determined to be good (OK) and the sound region of the mountain portion does not secure the area necessary for generating the specified torque, or the sound region of the mountain portion is When the screw length necessary for generating the specified torque is not secured, it is determined that the screw hole is defective (NG). Therefore, according to the aspect of this section, it is possible to determine with high accuracy whether or not the screw (screw hole) can generate the specified torque.

規定トルクが確保されているか否かを高い精度で判定することが可能なねじ良否判定方法及びねじ良否判定装置を提供することができる。   It is possible to provide a screw pass / fail determination method and a screw pass / fail determination device that can determine with high accuracy whether or not a prescribed torque is secured.

本発明の一実施形態を図１〜図７に基いて説明する。本実施形態のねじ良否判定方法は、判定対象となるねじ穴のねじ部１にレーザ光を照射して、ねじ部１で反射したレーザ光（以下、単に反射光と称する）の強度に基き当該ねじの良否を判定するものである。より詳しくは、反射光の強度に基きねじ部１の山部を健全領域（ＯＫ領域）と不健全領域（ＮＧ領域）とに分画し、山部の健全領域のみを抽出して画像化する。そして、山部の健全領域の面積とねじ部１の全体の面積とを比較し、又は山部の健全領域の面積から算出したねじ長と必要トルクを出すのに必要なねじ長とを比較し、山部の健全領域が規定トルクを発生するのに必要な面積を確保している場合に、又は山部の健全領域が規定トルクを発生するのに必要なねじ長を確保している場合に、ねじ穴が良（ＯＫ）であると判定され、山部の健全領域が規定トルクを発生するのに必要な面積確保していない場合に、又は山部の健全領域が規定トルクを発生するのに必要なねじ長を確保していない場合に、ねじ穴が不良（ＮＧ）であると判定される。これにより、本実施形態のねじ良否判定方法は、規定トルクが確保されているか否かを高い精度で判定することができる。   An embodiment of the present invention will be described with reference to FIGS. The screw pass / fail judgment method of the present embodiment is based on the intensity of laser light (hereinafter simply referred to as reflected light) reflected by the screw part 1 by irradiating the screw part 1 of the screw hole to be judged with laser light. The quality of the screw is judged. More specifically, the peak portion of the screw portion 1 is divided into a healthy region (OK region) and an unhealthy region (NG region) based on the intensity of the reflected light, and only the healthy region of the mountain portion is extracted and imaged. . Then, compare the area of the healthy region of the mountain portion with the entire area of the screw portion 1, or compare the screw length calculated from the area of the healthy region of the mountain portion with the screw length necessary to produce the required torque. When the sound area of the mountain area has enough area to generate the specified torque or when the sound area of the mountain area has enough screw length to generate the specified torque When the screw hole is determined to be good (OK) and the sound region of the mountain portion does not secure the area necessary for generating the specified torque, or the sound region of the mountain portion generates the specified torque. When the necessary screw length is not secured, it is determined that the screw hole is defective (NG). Thereby, the screw quality determination method of the present embodiment can determine with high accuracy whether or not the prescribed torque is secured.

図１に示されるのは、本実施形態のねじ良否判定装置の概略構成を示すブロック図である。ねじ良否判定装置は、ねじ部１に向けてレーザ光を照射する投光部（投光手段）と反射光を受光する受光部（受光手段）とが配設されたスティック形の投受光ヘッド２を備える。投受光ヘッド２は、主制御装置３の制御に基き作動するサーボモータ４の駆動により軸方向へ移動／位置決めされると共にサーボモータ５の駆動により軸線回りに回転／位置決めされる。なお、ねじ良否判定装置は、レーザ光源６で発せられたレーザ光が光ファイバ７を介して投光部へ伝送される。ねじ良否判定装置は、受光部によって受光された反射光が光ファイバ８を介して反射光測定装置９（測定手段）へ伝送される。反射光は、反射光測定装置９によって強度（以下、反射光強度と称する）が測定される。   FIG. 1 is a block diagram showing a schematic configuration of the screw quality determination device of the present embodiment. The screw pass / fail judgment device includes a stick-shaped light projecting / receiving head 2 in which a light projecting unit (light projecting unit) that emits laser light toward the screw unit 1 and a light receiving unit (light receiving unit) that receives reflected light are disposed. Is provided. The light projecting / receiving head 2 is moved / positioned in the axial direction by the drive of the servo motor 4 that operates based on the control of the main controller 3, and is rotated / positioned about the axis by the drive of the servo motor 5. In the screw quality determination device, the laser light emitted from the laser light source 6 is transmitted to the light projecting unit via the optical fiber 7. In the screw quality determination device, the reflected light received by the light receiving unit is transmitted to the reflected light measuring device 9 (measuring means) via the optical fiber 8. The intensity of the reflected light is measured by the reflected light measuring device 9 (hereinafter referred to as reflected light intensity).

そして、ねじ良否判定装置では、ねじ穴に挿入された投受光ヘッド２が回転しながら軸方向へ操作され、レーザ光が軸方向に対して平行なラインに沿ってねじ部１に投受光される。受光部（受光手段）によって受光された反射光は、その強度が反射光測定装置９（測定手段）によって測定される。そして、ねじ良否判定装置では、ねじ穴の軸線回りの計測された全ライン（L1,L2,・・・,Ln）について反射光強度が測定される。ねじ良否判定装置は、反射光測定装置９によって測定された反射光強度データを画像処理する画像処理装置１０を備える。画像処理装置１０は、計測した全ライン（L1,L2,・・・,Ln）の反射光強度データに基いてねじ穴の周方向に沿った展開画像を作像する作像部１１（作像手段）を有する。なお、図３に示されるように、展開画像は、山部が白色、傾斜部が黒色、谷部が灰色で示されて出力部１５によって出力される。   In the screw quality determination device, the light projecting / receiving head 2 inserted in the screw hole is operated in the axial direction while rotating, and the laser light is projected and received by the screw portion 1 along a line parallel to the axial direction. . The intensity of the reflected light received by the light receiving unit (light receiving means) is measured by the reflected light measuring device 9 (measuring means). And in a screw quality determination apparatus, reflected light intensity is measured about all the lines (L1, L2, ..., Ln) measured around the axis line of the screw hole. The screw pass / fail determination device includes an image processing device 10 that performs image processing on the reflected light intensity data measured by the reflected light measurement device 9. The image processing apparatus 10 creates an image forming unit 11 (image forming) that forms a developed image along the circumferential direction of the screw hole based on the reflected light intensity data of all the measured lines (L1, L2,..., Ln). Means). As shown in FIG. 3, the developed image is output by the output unit 15 with the peak portion being white, the inclined portion being black, and the valley portion being gray.

画像処理装置１０は、展開画像上の一ラインL1の反射光強度データ（図４参照）を抽出し、該反射光強度データをノイズフィルタによって処理してパルス列（図５参照）に加工した後、図６に示されるように、最低必要ねじ山高さの反射光強度を閾値として健全領域（ＯＫ領域）と不健全領域（ＮＧ領域）とに分画する分画部１２（分画手段）を備える。また、画像処理装置１０は、分画部１２による処理を各ライン（L1,L2,・・・,Ln）について実施し、各ライン（L1,L2,・・・,Ln）の処理結果の積算データから健全領域のみを抽出して画像化する抽出部１３（抽出手段）を備える。ねじ良否判定装置は、画像処理装置１０の抽出部１３よって抽出した健全領域の画像（図７参照）に基き健全領域の面積とねじ部１全体の面積とを比較し、健全領域が規定トルクを発生するのに必要な面積を確保しているか否かに基きねじ穴の良否を判定する判定部１４を備える。   The image processing apparatus 10 extracts the reflected light intensity data (see FIG. 4) of one line L1 on the developed image, processes the reflected light intensity data with a noise filter, and processes it into a pulse train (see FIG. 5). As shown in FIG. 6, a fractionation unit 12 (a fractionation unit) that fractionates a healthy region (OK region) and an unhealthy region (NG region) using the reflected light intensity of the minimum necessary thread height as a threshold value is provided. . Further, the image processing apparatus 10 performs the processing by the fractionation unit 12 for each line (L1, L2,..., Ln) and integrates the processing results of each line (L1, L2,..., Ln). An extraction unit 13 (extraction unit) that extracts and visualizes only a healthy area from data is provided. The screw pass / fail judgment device compares the area of the healthy region with the entire area of the screw portion 1 based on the image of the healthy region extracted by the extraction unit 13 of the image processing device 10 (see FIG. 7). A determination unit 14 is provided for determining whether the screw hole is good or not based on whether or not an area necessary for generation is secured.

判定部１４は、健全領域が規定トルクを発生するのに必要な面積を確保している場合に、又は健全領域が規定トルクを発生するのに必要なねじ長を確保している場合に、ねじ穴が良（ＯＫ）であると判定してその判定結果を出力部１５へ出力し、山部の健全領域が規定トルクを発生するのに必要な面積を確保していない場合に、又は山部の健全領域が規定トルクを発生するのに必要なねじ長を確保していない場合に、ねじ穴が不良（ＮＧ）であると判定してその判定結果を出力部１５へ出力するように構成される。   When the sound region has secured an area necessary for generating the specified torque or when the sound region has secured the screw length necessary for generating the specified torque, When it is determined that the hole is good (OK) and the determination result is output to the output unit 15, the sound area of the mountain portion does not secure an area necessary for generating the specified torque, or the mountain portion In the case where the sound region of the above does not secure the screw length necessary to generate the specified torque, the screw hole is determined to be defective (NG) and the determination result is output to the output unit 15. The

本実施形態のねじ良否判定方法を図２に示されるフローチャートに基き説明する。まず、ねじ穴に挿入して投受光ヘッド２を軸方向へ操作し、レーザ光を軸方向に対して平行なラインに沿ってねじ部１に投受光する。この時の反射光強度を測定し、測定結果としての反射光強度データをラインで記憶する。そして、ねじ穴の軸線回りの計測した全ライン（L1,L2,・・・,Ln）について反射光強度を測定し、各ライン（L1,L2,・・・,Ln）の反射光強度データに基き、ねじ穴の周方向に沿った展開画像を作像する（ステップ１）。次に、展開画像上の一ラインL1の反射光強度データを抽出し（ステップ２）、該反射光強度データをノイズフィルタによって処理してパルス列に加工する（ステップ３）。そして、抽出された反射光強度データを、最低必要ねじ山高さの反射光強度を閾値として健全領域（ＯＫ領域）と不健全領域（ＮＧ領域）とに分画する（ステップ４）。   The screw quality determination method of the present embodiment will be described based on the flowchart shown in FIG. First, it is inserted into a screw hole, and the light projecting / receiving head 2 is operated in the axial direction, so that the laser beam is projected and received by the screw portion 1 along a line parallel to the axial direction. The reflected light intensity at this time is measured, and the reflected light intensity data as a measurement result is stored in a line. Then, the reflected light intensity is measured for all the lines (L1, L2, ..., Ln) measured around the axis of the screw hole, and the reflected light intensity data of each line (L1, L2, ..., Ln) is measured. Based on this, a developed image is formed along the circumferential direction of the screw hole (step 1). Next, the reflected light intensity data of one line L1 on the developed image is extracted (step 2), and the reflected light intensity data is processed by a noise filter and processed into a pulse train (step 3). Then, the extracted reflected light intensity data is divided into a healthy area (OK area) and an unhealthy area (NG area) using the reflected light intensity of the minimum necessary thread height as a threshold (step 4).

次に、ステップ２〜４の処理を、展開画像上の各ライン（L1,L2,・・・,Ln）について実施し、各ライン（L1,L2,・・・,Ln）の処理結果の積算データから健全領域のみを抽出して画像化する（ステップ５）。そして、抽出された健全領域の画像（図７参照）に基き健全領域の面積を測定し（ステップ６）、測定された健全領域の面積とねじ部１全体の面積とを比較し、健全領域が規定トルクを発生するのに必要な面積を確保している場合に、ねじ穴が良（ＯＫ）であると判定してその判定結果を出力部１５へ出力し、山部の健全領域が規定トルクを発生するのに必要な面積を確保していない場合に、ねじ穴が不良（ＮＧ）であると判定してその判定結果を出力部１５へ出力する（ステップ７）。   Next, the processing in steps 2 to 4 is performed for each line (L1, L2,..., Ln) on the developed image, and the processing results of each line (L1, L2,..., Ln) are integrated. Only the healthy area is extracted from the data and imaged (step 5). Then, the area of the healthy area is measured based on the extracted image of the healthy area (see FIG. 7) (step 6), and the measured area of the healthy area is compared with the entire area of the screw portion 1 to obtain the healthy area. When the area necessary for generating the specified torque is secured, it is determined that the screw hole is good (OK), and the determination result is output to the output unit 15, and the healthy region of the mountain portion is the specified torque. If the area necessary to generate the error is not secured, it is determined that the screw hole is defective (NG), and the determination result is output to the output unit 15 (step 7).

この実施形態では以下の効果を奏する。
本実施形態によれば、規定トルクを発生させることができるか否かに直接的に係るねじ長を、該ねじ長に比例するねじ部１の山部の健全領域（ＯＫ領域）に置き換え、このねじ部１の山部の健全領域をねじ部１に照射したレーザ光の反射光強度に基き抽出して画像化し、抽出された健全領域の画像に基き、健全領域の面積とねじ部１全体の面積とを比較し、又は山部の健全領域の面積から算出したねじ長と必要トルクを出すのに必要なねじ長とを比較し、健全領域が規定トルクを発生するのに必要な面積を確保している場合に、又は健全領域が規定トルクを発生するのに必要なねじ長を確保している場合に、ねじ穴が良（ＯＫ）であると判定し、健全領域が規定トルクを発生するのに必要な面積を確保していない場合に、又は健全領域が規定トルクを発生するのに必要なねじ長を確保していない場合に、ねじ穴が不良（ＮＧ）であると判定するので、規定トルクが確保されているか否かを高い精度で判定することができる。 This embodiment has the following effects.
According to the present embodiment, the screw length directly related to whether or not the specified torque can be generated is replaced with a healthy region (OK region) of the thread portion of the screw portion 1 proportional to the screw length. The sound region of the crest portion of the screw portion 1 is extracted and imaged based on the reflected light intensity of the laser light applied to the screw portion 1, and the area of the sound region and the entire screw portion 1 are determined based on the extracted image of the sound region. Compare the area or compare the screw length calculated from the area of the healthy area of the mountain with the screw length necessary to generate the required torque, and secure the area necessary for the healthy area to generate the specified torque If the screw length necessary for generating the specified torque is secured in the sound area, the screw hole is determined to be good (OK), and the sound area generates the specified torque. If the necessary area is not secured, or a healthy area is specified When the screw length necessary to generate the torque is not secured, it is determined that the screw hole is defective (NG), so it is possible to determine with high accuracy whether the specified torque is secured. .

なお、実施形態は上記に限定されるものではなく、例えば次のように構成してもよい。
投受光ヘッド２をねじ穴の軸に対して平行な平面（軸方向がＺ方向である場合はＸＹ平面）上の主制御装置３によって指定された位置に位置決め可能に構成してもよい。この場合、ワーク上に配設された複数個のねじ穴の良否判定を自動で行うことが可能になる。 In addition, embodiment is not limited above, For example, you may comprise as follows.
The light projecting / receiving head 2 may be configured to be positioned at a position designated by the main control device 3 on a plane parallel to the axis of the screw hole (XY plane when the axial direction is the Z direction). In this case, it is possible to automatically determine whether the plurality of screw holes arranged on the work are good or bad.

本実施形態のねじ良否判定装置の概略構成を示すブロック図である。It is a block diagram which shows schematic structure of the screw quality determination apparatus of this embodiment. 本実施形態のねじ良否判定方法のフローチャートである。It is a flowchart of the screw quality determination method of the present embodiment. 反射光測定装置の測定結果に基き作像されたねじ部の展開画像である。It is the expansion | deployment image of the screw part imaged based on the measurement result of the reflected light measuring device. 図３の展開画像上の一ラインの反射光強度データを示す図である。It is a figure which shows the reflected light intensity data of one line on the expansion | deployment image of FIG. 図４の反射光強度データをフィルタ処理した後のパルス列を示す図である。It is a figure which shows the pulse train after filtering the reflected light intensity data of FIG. 図５のパルス列の反射光強度データを最低必要ねじ山高さの反射光強度を閾値として健全領域（ＯＫ領域）と不健全領域（ＮＧ領域）とに分画する処理を示す図である。It is a figure which shows the process which fractionates the reflected light intensity data of the pulse train of FIG. 5 into the healthy area | region (OK area | region) and the unhealthy area | region (NG area | region) by making the reflected light intensity | strength of minimum required thread height into a threshold value. 展開画像上の各ライン（L1,L2,・・・,Ln）分画処理結果の積算データから健全領域のみを抽出して画像化した図である。It is the figure which extracted and imaged only the healthy area | region from the integration data of each line (L1, L2, ..., Ln) fraction processing result on an expansion | deployment image.

符号の説明Explanation of symbols

１ ねじ部、２ 投受光ヘッド（投光部、受光部）、９ 反射光測定装置（測定手段）、１１ 作像部（作像手段）、１２ 分画部（分画手段）、１３ 抽出部（抽出手段）、１４ 判定部（判定手段） DESCRIPTION OF SYMBOLS 1 Screw part, 2 Light projecting / receiving head (light projecting part, light receiving part), 9 Reflected light measuring device (measuring means), 11 Image forming part (imaging means), 12 Fractionation part (fractionation means), 13 Extraction part (Extraction means), 14 determination unit (determination means)

Claims (4)

ねじ部に照射したレーザ光の反射光の強度を測定する測定ステップと、
前記測定ステップによって測定された反射光強度に基いて、山部、傾斜部、谷部に分画された前記ねじ部の展開画像を作像する作像ステップと、
前記作像ステップによって作像された前記ねじ部の展開画像の一軸断面の反射光強度データを抽出し、抽出された反射光強度データに基いて前記ねじ部の一軸断面の前記山部を健全領域と不健全領域とに分画する分画ステップと、
前記分画ステップを前記ねじ部の展開画像の全面について実行し、全断面の前記山部の健全領域のみを抽出して画像化する抽出ステップと、
前記抽出ステップによって抽出された前記山部の健全領域の画像に基いて前記ねじ部の良否を判定する判定ステップと、
によって構成されることを特徴とするねじ良否判定方法。 A measurement step for measuring the intensity of the reflected light of the laser light irradiated to the screw portion;
Based on the reflected light intensity measured by the measuring step, an image forming step for forming a developed image of the screw portion divided into a peak portion, an inclined portion, and a valley portion;
Extracting the reflected light intensity data of the uniaxial cross section of the developed image of the threaded portion formed by the image forming step, and extracting the peak portion of the uniaxial cross section of the threaded portion based on the extracted reflected light intensity data. And a fractionation step for fractionation into unhealthy areas,
An extraction step of performing the fractionation step on the entire surface of the developed image of the screw portion, extracting only the sound region of the mountain portion of the entire cross section, and imaging,
A determination step of determining pass / fail of the screw portion based on an image of the healthy region of the peak portion extracted by the extraction step;
It is comprised by these, The screw quality determination method characterized by the above-mentioned. 前記判定ステップは、前記山部の健全領域の面積とねじ部全体の面積とを比較して、前記ねじ部が規定トルクを発生するのに必要な前記健全領域を確保しているか否かの判定基準に基いて前記ねじ部の良否を判定すること、又は前記山部の健全領域の面積から算出された健全なねじ長と規定トルクに必要なねじ長とを比較して良否を判定することを特徴とする請求項１に記載のねじ良否判定方法。 The determination step compares the area of the healthy region of the peak portion with the area of the entire screw portion, and determines whether or not the sound region necessary for the screw portion to generate a specified torque is secured. Determining pass / fail of the screw portion based on a reference, or determining pass / fail by comparing a healthy screw length calculated from the area of the healthy region of the peak portion with a screw length necessary for a specified torque. The screw pass / fail judgment method according to claim 1, wherein ねじ部に向けてレーザ光を照射する投光手段と、
前記投光手段から照射したレーザ光の反射光を受光する受光手段と、
前記受光手段によって受光した前記反射光の強度を測定する測定手段と、
前記測定手段によって測定された前記反射光の強度に基いて山部、傾斜部、谷部に分画された前記ねじ部の展開画像を作像する作像手段と、
前記作像手段によって作像された前記ねじ部の展開画像の一軸断面の反射光強度データを抽出し、抽出された反射光強度データに基いて前記ねじ部の一軸断面の前記山部を健全領域と不健全領域とに分画する分画手段と、
前記ねじ部の展開画像の全面の前記山部の健全領域のみを抽出して画像化する抽出手段と、
前記抽出手段によって抽出及び画像化された前記山部の健全領域の画像に基いて前記ねじ部の良否を判定する判定手段と、
を具備することを特徴とするねじ良否判定装置。 A light projecting means for irradiating a laser beam toward the screw portion;
A light receiving means for receiving reflected light of the laser light emitted from the light projecting means;
Measuring means for measuring the intensity of the reflected light received by the light receiving means;
An image forming means for forming a developed image of the screw portion divided into a peak portion, an inclined portion, and a valley portion based on the intensity of the reflected light measured by the measuring means;
Extracting the reflected light intensity data of the uniaxial cross section of the developed image of the screw part imaged by the imaging means, and extracting the peak part of the uniaxial cross section of the screw part based on the extracted reflected light intensity data And a fractionation means for fractionation into unhealthy areas,
An extracting means for extracting and imaging only the sound region of the mountain portion on the entire surface of the developed image of the screw portion;
A determination unit that determines the quality of the screw portion based on an image of the healthy region of the mountain portion extracted and imaged by the extraction unit;
A screw pass / fail judgment device comprising: 前記判定手段は、前記山部の健全領域の面積とねじ部全体の面積とを比較して、前記ねじ部が規定トルクを発生するのに必要な前記健全領域を確保しているか否かの判定基準に基いて前記ねじ部の良否を判定すること、又は前記山部の健全領域の面積から算出された健全なねじ長と規定トルクに必要なねじ長とを比較して良否を判定することを特徴とする請求項３に記載のねじ良否判定装置。 The determination means compares the area of the healthy region of the peak portion with the area of the entire screw portion, and determines whether or not the sound region necessary for the screw portion to generate a specified torque is secured. Determining pass / fail of the screw portion based on a reference, or determining pass / fail by comparing a healthy screw length calculated from the area of the healthy region of the peak portion with a screw length necessary for a specified torque. The screw quality determination device according to claim 3, wherein the screw quality determination device is a screw quality determination device.
JP2007019399A 2007-01-30 2007-01-30 Method and apparatus for judging quality of screw Pending JP2008185462A (en)

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JP2011089826A (en) * 2009-10-21 2011-05-06 Aisin Seiki Co Ltd Internal surface defect inspection apparatus of screw hole or hole
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