JP2002039958A - Method and apparatus for detecting work flaw - Google Patents
Method and apparatus for detecting work flawInfo
- Publication number
- JP2002039958A JP2002039958A JP2000229806A JP2000229806A JP2002039958A JP 2002039958 A JP2002039958 A JP 2002039958A JP 2000229806 A JP2000229806 A JP 2000229806A JP 2000229806 A JP2000229806 A JP 2000229806A JP 2002039958 A JP2002039958 A JP 2002039958A
- Authority
- JP
- Japan
- Prior art keywords
- image
- flaw
- image processing
- cleaning
- work
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 40
- 239000000428 dust Substances 0.000 claims abstract description 16
- 239000004744 fabric Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000004904 shortening Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 18
- 238000010586 diagram Methods 0.000 description 4
- 239000006096 absorbing agent Substances 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Cleaning In General (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は油圧緩衝器のピスト
ンロッド等のワークの傷検出方法及び装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for detecting scratches on a work such as a piston rod of a hydraulic shock absorber.
【０００２】[0002]
【従来の技術】油圧緩衝器のピストンロッド等のワーク
にあっては、表面傷がオイルシールを損傷させてオイル
漏れの原因になる等を防止するため、ワークの表面を画
像処理して傷の有無を検出している。2. Description of the Related Art In the case of a work such as a piston rod of a hydraulic shock absorber, the surface of the work is image-processed in order to prevent a surface flaw from damaging an oil seal and causing oil leakage. The presence or absence has been detected.
【０００３】従来技術では、ワークの表面に付着してい
るゴミを傷とみなすことを回避するため、ワークの表面
の汚れを完全に除去する必要があり、多量の洗剤を用い
た予備洗浄、純水を用いた超音波洗浄等の複数回の洗浄
を繰り返している。In the prior art, it is necessary to completely remove the dirt on the surface of the work in order to avoid the dust adhering to the surface of the work as a scratch. Washing such as ultrasonic washing using water is repeated a plurality of times.
【０００４】[0004]
【発明が解決しようとする課題】従来技術では、ゴミ等
の汚れを完全に洗浄して傷検出精度を向上するために
は、洗浄時間が長時間になり、洗浄設備も大型になり、
ワークの傷検出ラインの生産効率が低下してしまう。In the prior art, in order to completely clean dirt such as dust and improve the detection accuracy of flaws, the cleaning time becomes long and the cleaning equipment becomes large.
The production efficiency of the work scratch detection line is reduced.
【０００５】本発明の課題は、ワークの表面の傷を検出
するに際し、洗浄時間を短時間にし、洗浄設備も簡素化
することによって生産効率を向上しながら、傷検出精度
を向上することにある。SUMMARY OF THE INVENTION An object of the present invention is to improve the detection accuracy of flaws while shortening the cleaning time and simplifying the cleaning equipment when detecting flaws on the surface of a work, thereby improving production efficiency. .
【０００６】[0006]
【課題を解決するための手段】請求項１の発明は、ワー
クの表面の画像処理により傷を検出する方法において、
画像処理により傷画像有りを識別した場合、ワークの表
面を清掃し、該表面の画像を再度取込んで、再画像処理
を行ない、前記傷画像の位置が再画像処理後に移動して
いるとき、該傷画像をゴミとみなして傷無しと判断する
ようにしたものである。According to a first aspect of the present invention, there is provided a method for detecting a flaw by image processing of a surface of a work,
When the presence of a flaw image is identified by the image processing, the surface of the work is cleaned, the image of the surface is captured again, and the re-image processing is performed. The scratch image is regarded as dust, and it is determined that there is no scratch.
【０００７】請求項２の発明は、ワークの表面の画像処
理により傷を検出する装置において、ワーク表面の画像
を取込む画像取込手段と、画像取込手段が取込んだ画像
を処理する画像処理手段と、画像処理手段の画像処理結
果より傷画像の有無を識別する識別手段と、ワークの表
面を清掃する清掃手段と、画像処理手段と識別手段と清
掃手段を制御する制御手段とを有し、制御手段は、画像
処理手段による画像処理により傷画像有りを識別した場
合、清掃手段によってワークの表面を清掃し、該表面の
画像を再度取込んで、画像処理手段による再画像処理を
行ない、前記傷画像の位置が再画像処理後に移動してい
るとき、該傷画像をゴミとみなして傷無しと判断するよ
うにしたものである。According to a second aspect of the present invention, there is provided an apparatus for detecting a flaw by image processing of a surface of a workpiece, wherein the image capturing means captures an image of the surface of the workpiece, and an image which processes the image captured by the image capturing means. Processing means, identification means for identifying the presence or absence of a flaw image from the image processing result of the image processing means, cleaning means for cleaning the surface of the work, and control means for controlling the image processing means, the identification means and the cleaning means. When the control means identifies the presence of the flaw image by the image processing by the image processing means, the cleaning means cleans the surface of the work, takes in the image of the surface again, and performs the re-image processing by the image processing means. When the position of the flaw image is moving after the re-image processing, the flaw image is regarded as dust, and it is determined that there is no flaw.
【０００８】請求項３の発明は、請求項２の発明におい
て更に、前記清掃手段がエアブローにより行なうように
したものである。According to a third aspect of the present invention, in the second aspect of the present invention, the cleaning means is performed by air blow.
【０００９】請求項４の発明は、請求項２の発明におい
て更に、前記清掃手段が回転ブラシにより行なうように
したものである。According to a fourth aspect of the present invention, in addition to the second aspect, the cleaning means is performed by a rotating brush.
【００１０】請求項５の発明は、請求項２の発明におい
て更に、前記清掃手段が布テープの擦り付けにより行な
うようにしたものである。According to a fifth aspect of the present invention, in the second aspect of the present invention, the cleaning means is performed by rubbing a cloth tape.
【００１１】[0011]
【作用】請求項１〜５の発明によれば以下の作用があ
る。ワークの表面の傷は清掃の前後で移動することがな
いから、１回目の画像処理と２回目の再画像処理の両方
で同一位置に位置する傷画像は傷と判断するが、再画像
処理により移動することになった傷画像はゴミと判断で
きる。従って、ワークの表面にゴミがあっても、ゴミと
傷とを判別できるから、洗浄は簡易化できる。よって、
傷を高精度で検出しながら、洗浄時間を短時間にし、洗
浄設備も簡素化し、ワークの傷検出ラインの生産効率を
向上できる。According to the first to fifth aspects of the present invention, the following operations are provided. Since the scratch on the surface of the work does not move before and after cleaning, the scratch image located at the same position in both the first image processing and the second re-image processing is determined to be a scratch. The moved scratch image can be determined to be dust. Therefore, even if there is dust on the surface of the work, the dust can be distinguished from the scratch, so that the cleaning can be simplified. Therefore,
The cleaning time can be reduced while detecting the flaws with high accuracy, the cleaning equipment can be simplified, and the production efficiency of the work flaw detection line can be improved.
【００１２】[0012]
【発明の実施の形態】図１は傷検出装置を示す模式図、
図２は傷検出装置を示すブロック図、図３は傷検出装置
の検出手順を示す流れ図である。FIG. 1 is a schematic diagram showing a flaw detection device.
FIG. 2 is a block diagram showing a flaw detection device, and FIG. 3 is a flowchart showing a detection procedure of the flaw detection device.
【００１３】傷検出装置１０は、油圧緩衝器のピストン
ロッド１の表面の画像処理により、傷を検出する。The flaw detection device 10 detects flaws by image processing of the surface of the piston rod 1 of the hydraulic shock absorber.
【００１４】傷検出装置１０は、図１に示す如く、画像
取込装置１１と、パソコン１２と、清掃装置１３と、ワ
ーク回転装置１４と、表示装置１５を有する。As shown in FIG. 1, the flaw detection device 10 has an image capturing device 11, a personal computer 12, a cleaning device 13, a work rotating device 14, and a display device 15.
【００１５】画像取込装置１１は、ＣＣＤカメラ等のラ
インセンサからなるカメラ２１と、光源２２とからな
り、ロッド１の表面の画像を取込む。The image capturing device 11 includes a camera 21 composed of a line sensor such as a CCD camera and a light source 22, and captures an image of the surface of the rod 1.
【００１６】パソコン１２は、図２に示す如く、画像処
理手段３１と識別手段３２と制御手段３３を有する。画
像処理手段３１は画像取込装置１１が取込んだ画像を処
理する。識別手段３２は画像処理手段３１の画像処理結
果を得て画像の濃淡から傷画像２（傷２Ａ、ゴミ２Ｂ）
の有無を識別する。尚、ロッド１は予め基準位置マーク
を付されており、画像処理手段３１により処理された画
像はこのマークに対応する規準位置Ｐを付与され（図
３）、識別手段３２は傷画像２の位置をこの規準位置Ｐ
を規準として算定する。制御手段３３については後述す
る。As shown in FIG. 2, the personal computer 12 has an image processing means 31, an identification means 32, and a control means 33. The image processing means 31 processes the image captured by the image capturing device 11. The identification unit 32 obtains the image processing result of the image processing unit 31 and determines the scratch image 2 (scratch 2A, dust 2B) based on the density of the image.
Identify the presence or absence of The rod 1 is provided with a reference position mark in advance, the image processed by the image processing means 31 is provided with a reference position P corresponding to the mark (FIG. 3), and the identification means 32 determines the position of the flaw image 2. To this reference position P
Calculate based on The control means 33 will be described later.
【００１７】清掃装置１３は、エアブロー４１（エアフ
ィルタ４１Ａ、エアバルブ４１Ｂ）により構成でき、ロ
ッド１の表面を簡易清掃する。尚、清掃装置１３は、回
転ブラシ４２により（図１（Ｂ））、又は回転布テープ
４３により構成できる（図１（Ｃ））。The cleaning device 13 can be constituted by an air blow 41 (air filter 41A, air valve 41B) and simply cleans the surface of the rod 1. The cleaning device 13 can be constituted by a rotating brush 42 (FIG. 1B) or by a rotating cloth tape 43 (FIG. 1C).
【００１８】ワーク回転装置１４は、簡易洗浄後のロッ
ド１を受取り、ロッド１を検出作業位置にて周回せし
め、検出後のロッド１（良品１Ａ、不良品１Ｂ）を払い
出す。The work rotating device 14 receives the rod 1 after the simple cleaning, rotates the rod 1 at the detection work position, and pays out the detected rod 1 (non-defective 1A, defective 1B).
【００１９】表示装置１５は、ロッド１の傷有りを判断
したとき、これを音、光等により表示し、オペレータに
報知する。When the display device 15 determines that the rod 1 is flawed, it displays this by sound, light, or the like, and notifies the operator.
【００２０】然るに、パソコン１２の制御手段３３は、
画像処理手段３１と識別手段３２と清掃装置１３を制御
し、ロッド１の傷の有無を下記(1)〜(6)により検出する
（図３）。 (1)ロッド１を投入する。尚、ロッド１は汚れの付着度
に対応する簡易洗浄を付与されてワーク回転装置１４に
搬入される。However, the control means 33 of the personal computer 12
The image processing means 31, the identification means 32, and the cleaning device 13 are controlled, and the presence or absence of a flaw on the rod 1 is detected by the following (1) to (6) (FIG. 3). (1) Put the rod 1 in. It should be noted that the rod 1 is subjected to simple cleaning corresponding to the degree of adhesion of dirt and is carried into the work rotating device 14.
【００２１】(2)ワーク回転装置１４によりロッド１を
周回しながら、画像取込装置１１のカメラ２１により表
面の画像を取込む。(2) An image of the surface is captured by the camera 21 of the image capturing device 11 while rotating the rod 1 by the work rotating device 14.
【００２２】(3)上述(2)の画像を画像処理手段３１によ
り処理し、識別手段３２により傷画像２の有無を識別す
る（画像識別１）。傷画像２が全く無いロッド１は良品
（ＯＫ）として払い出される。(3) The image of (2) is processed by the image processing means 31, and the presence or absence of the flaw image 2 is identified by the identification means 32 (image identification 1). The rod 1 having no scratch image 2 is paid out as a good product (OK).
【００２３】(4)上述(3)で傷画像２有りとなったロッド
１については、清掃装置１３のエアブロー４１等により
軽く表面を清掃する。(4) The surface of the rod 1 having the flaw image 2 in the above (3) is lightly cleaned by the air blow 41 of the cleaning device 13 or the like.
【００２４】(5)ワーク回転装置１４によりロッド１を
周回しながら、画像取込装置１１のカメラ２１により表
面の画像を再度取込む。そして、取込んだ画像を再び画
像処理手段３１により処理し、識別手段３２により傷画
像２の有無を識別する（画像識別２）。傷画像２が全く
ないものとなったロッド１は良品（ＯＫ）として払い出
される。(5) While rotating the rod 1 by the work rotating device 14, the camera 21 of the image capturing device 11 captures an image of the surface again. Then, the captured image is processed again by the image processing means 31, and the presence or absence of the flaw image 2 is identified by the identification means 32 (image identification 2). The rod 1 having no scratch image 2 is paid out as a good product (OK).
【００２５】(6)上述(5)で傷画像２有りとなったロッド
１については、制御手段３３において、前述(3)の画像
識別１で有りとされた傷画像２の位置、大きさ、形状
と、上述(5)の画像識別２で有りとされた傷画像２の位
置、大きさ、形状を比較する。(6) For the rod 1 having the flaw image 2 in the above (5), the control means 33 determines the position, size, and position of the flaw image 2 determined to be the flaw in the image identification 1 in the above (3). The shape is compared with the position, size, and shape of the flaw image 2 determined to be present in the image identification 2 in (5) above.
【００２６】制御手段３３は、画像識別１の傷画像２の
位置と画像識別２の傷画像２の位置とが同一位置であれ
ば、傷画像２は傷２Ａとみなし、傷有りと判断し、この
ロッド１は不良品（ＮＧ）として払い出す。If the position of the flaw image 2 of the image identification 1 is the same as the position of the flaw image 2 of the image identification 2, the control means 33 regards the flaw image 2 as a flaw 2A and determines that there is a flaw. This rod 1 is paid out as a defective product (NG).
【００２７】制御手段３３は、画像識別１の傷画像２の
位置に対し、画像識別２の傷画像２の位置が移動してい
るときには、傷画像２はゴミ２Ｂとみなし、傷無しと判
断し、傷２Ａが全く無いものとなったロッド１は良品
（ＯＫ）として払い出す。When the position of the flaw image 2 of the image identification 2 is moving with respect to the position of the flaw image 2 of the image identification 1, the control means 33 regards the flaw image 2 as dust 2B and determines that there is no flaw. The rod 1 having no scratches 2A is paid out as a good product (OK).
【００２８】本実施形態によれば、以下の作用がある。
ロッド１の表面の傷２Ａは清掃の前後で移動することが
ないから、１回目の画像処理と２回目の再画像処理の両
方で同一位置に位置する傷画像２は傷２Ａと判断する
が、再画像処理により移動することになった傷画像２は
ゴミ２Ｂと判断できる。従って、ロッド１の表面にゴミ
２Ｂがあっても、ゴミ２Ｂと傷２Ａとを判別できるか
ら、洗浄は簡易化できる。よって、傷２を高精度で検出
しながら、洗浄時間を短時間にし、洗浄設備も簡素化
し、ロッド１の傷検出ラインの生産効率を向上できる。According to this embodiment, the following operations are provided.
Since the scratch 2A on the surface of the rod 1 does not move before and after cleaning, the scratch image 2 located at the same position is determined as the scratch 2A in both the first image processing and the second re-image processing. The scratch image 2 that has been moved by the re-image processing can be determined as dust 2B. Therefore, even if there is dust 2B on the surface of the rod 1, the dust 2B can be distinguished from the flaw 2A, so that the cleaning can be simplified. Therefore, while detecting the flaw 2 with high accuracy, the cleaning time can be shortened, the cleaning equipment can be simplified, and the production efficiency of the flaw detection line for the rod 1 can be improved.
【００２９】以上、本発明の実施の形態を図面により詳
述したが、本発明の具体的な構成はこの実施の形態に限
られるものではなく、本発明の要旨を逸脱しない範囲の
設計の変更等があっても本発明に含まれる。The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention.
【００３０】[0030]
【発明の効果】以上のように本発明によれば、ワークの
表面の傷を検出するに際し、洗浄時間を短時間にし、洗
浄設備も簡素化することによって生産効率を向上しなが
ら、傷検出精度を向上することできる。As described above, according to the present invention, when detecting flaws on the surface of a work, the cleaning time is shortened and the cleaning equipment is simplified, thereby improving the production efficiency and improving the flaw detection accuracy. Can be improved.
【図１】図１は傷検出装置を示す模式図である。FIG. 1 is a schematic diagram showing a flaw detection device.
【図２】図２は傷検出装置を示すブロック図である。FIG. 2 is a block diagram showing a flaw detection device.
【図３】図３は傷検出装置の検出手順を示す流れ図であ
る。FIG. 3 is a flowchart showing a detection procedure of the flaw detection device.
１ ピストンロッド（ワーク） ２ 傷画像 ２Ａ 傷 ２Ｂ ゴミ １０ 傷検出装置 １１ 画像取込装置（画像取込手段） １３ 清掃装置（清掃手段） ３１ 画像処理手段 ３２ 識別手段 ３３ 制御手段 ４１ エアブロー ４２ 回転ブラシ ４３ 回転布テープ REFERENCE SIGNS LIST 1 piston rod (work) 2 scratch image 2A scratch 2B dust 10 scratch detection device 11 image capture device (image capture device) 13 cleaning device (cleaning device) 31 image processing device 32 identification device 33 control device 41 air blow 42 rotary brush 43 rotating cloth tape
Claims (5)
する方法において、 画像処理により傷画像有りを識別した場合、ワークの表
面を清掃し、該表面の画像を再度取込んで、再画像処理
を行ない、前記傷画像の位置が再画像処理後に移動して
いるとき、該傷画像をゴミとみなして傷無しと判断する
ことを特徴とするワークの傷検出方法。1. A method for detecting a flaw by image processing of a surface of a work, wherein when the presence of a flaw image is identified by the image processing, the surface of the work is cleaned, and the image of the surface is taken in again to perform re-image processing. And when the position of the flaw image moves after re-image processing, the flaw image is regarded as dust, and it is determined that there is no flaw.
する装置において、 ワーク表面の画像を取込む画像取込手段と、 画像取込手段が取込んだ画像を処理する画像処理手段
と、 画像処理手段の画像処理結果より傷画像の有無を識別す
る識別手段と、 ワークの表面を清掃する清掃手段と、 画像処理手段と識別手段と清掃手段を制御する制御手段
とを有し、 制御手段は、画像処理手段による画像処理により傷画像
有りを識別した場合、清掃手段によってワークの表面を
清掃し、該表面の画像を再度取込んで、画像処理手段に
よる再画像処理を行ない、前記傷画像の位置が再画像処
理後に移動しているとき、該傷画像をゴミとみなして傷
無しと判断することを特徴とするワークの傷検出装置。2. An apparatus for detecting flaws by image processing of a surface of a work, comprising: image capturing means for capturing an image of the work surface; image processing means for processing the image captured by the image capturing means; An identification unit for identifying the presence or absence of a flaw image based on an image processing result of the processing unit; a cleaning unit for cleaning a surface of the work; a control unit for controlling the image processing unit, the identification unit, and the cleaning unit; When the presence of a flaw image is identified by the image processing by the image processing means, the surface of the work is cleaned by the cleaning means, the image of the surface is captured again, and the re-image processing is performed by the image processing means. When the position moves after re-image processing, the flaw image is regarded as dust, and it is determined that there is no flaw.
請求項２記載のワークの傷検出装置。3. The apparatus according to claim 2, wherein the cleaning unit performs the air blow.
請求項２記載のワークの傷検出装置。4. The apparatus according to claim 2, wherein said cleaning means is performed by a rotating brush.
り行なう請求項２記載のワークの傷検出装置。5. The apparatus according to claim 2, wherein said cleaning means performs the cleaning by rubbing a cloth tape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000229806A JP2002039958A (en) | 2000-07-28 | 2000-07-28 | Method and apparatus for detecting work flaw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000229806A JP2002039958A (en) | 2000-07-28 | 2000-07-28 | Method and apparatus for detecting work flaw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002039958A true JP2002039958A (en) | 2002-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000229806A Withdrawn JP2002039958A (en) | 2000-07-28 | 2000-07-28 | Method and apparatus for detecting work flaw |
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| JP (1) | JP2002039958A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006258737A (en) * | 2005-03-18 | 2006-09-28 | Kobe Steel Ltd | Surface defect inspection method of aluminum alloy bar material |
| CN102072910A (en) * | 2010-11-13 | 2011-05-25 | 上海交通大学 | Visual inspection system for automobile piston assembly quality |
| CN108645869A (en) * | 2018-08-20 | 2018-10-12 | 中国印刷科学技术研究院有限公司 | The non-defective method for removing and its device of gravure printing roller surface defect intelligent measurement |
| CN109254015A (en) * | 2018-09-26 | 2019-01-22 | 浙江双鸿智能设备有限公司 | A kind of detection device on automated cleaning Cylindrical workpiece surface |
| CN109444157A (en) * | 2018-12-25 | 2019-03-08 | 苏州凡目视觉科技有限公司 | A kind of scratch detection apparatus and method |
| CN114310395A (en) * | 2022-01-13 | 2022-04-12 | 广东韶钢松山股份有限公司 | Device and method for detecting scratch depth of surface of metal workpiece |
-
2000
- 2000-07-28 JP JP2000229806A patent/JP2002039958A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006258737A (en) * | 2005-03-18 | 2006-09-28 | Kobe Steel Ltd | Surface defect inspection method of aluminum alloy bar material |
| JP4509833B2 (en) * | 2005-03-18 | 2010-07-21 | 株式会社神戸製鋼所 | Surface defect inspection method for aluminum alloy bar |
| CN102072910A (en) * | 2010-11-13 | 2011-05-25 | 上海交通大学 | Visual inspection system for automobile piston assembly quality |
| CN108645869A (en) * | 2018-08-20 | 2018-10-12 | 中国印刷科学技术研究院有限公司 | The non-defective method for removing and its device of gravure printing roller surface defect intelligent measurement |
| CN109254015A (en) * | 2018-09-26 | 2019-01-22 | 浙江双鸿智能设备有限公司 | A kind of detection device on automated cleaning Cylindrical workpiece surface |
| CN109254015B (en) * | 2018-09-26 | 2022-04-05 | 浙江双鸿智能设备有限公司 | Detection equipment for automatically cleaning surface of cylinder workpiece |
| CN109444157A (en) * | 2018-12-25 | 2019-03-08 | 苏州凡目视觉科技有限公司 | A kind of scratch detection apparatus and method |
| CN114310395A (en) * | 2022-01-13 | 2022-04-12 | 广东韶钢松山股份有限公司 | Device and method for detecting scratch depth of surface of metal workpiece |
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