JP5272814B2 - Side surface imaging method and side surface observation apparatus for coiled steel strip - Google Patents
Side surface imaging method and side surface observation apparatus for coiled steel strip Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 134
- 239000010959 steel Substances 0.000 title claims abstract description 134
- 238000003384 imaging method Methods 0.000 title claims abstract description 53
- 238000005286 illumination Methods 0.000 claims abstract description 13
- 238000004804 winding Methods 0.000 claims abstract description 13
- 230000007547 defect Effects 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 19
- 230000003287 optical effect Effects 0.000 claims description 5
- 230000001678 irradiating effect Effects 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract description 5
- 238000007689 inspection Methods 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
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Abstract
Description
本発明は、鉄鋼分野の製品である鋼帯を、コイル状に巻いた製品の側面の欠陥及び異常を検査する技術に関し、特に、コイル状鋼帯の側面を撮像・観察する、コイル状鋼帯の側面撮像方法および側面観察装置に関するものである。 The present invention relates to a technique for inspecting defects and abnormalities on the side surface of a product obtained by winding a steel strip, which is a product in the field of steel, in a coil shape, and in particular, imaging and observing the side surface of a coiled steel strip. The side surface imaging method and the side surface observation apparatus are related.
鉄鋼業においては、家電製品用、自動車用等の厚さ0.1mm乃至 10mm程度の鋼帯はコイル状に巻かれて出荷されることが一般的である。鋼帯の表面は出荷前に、例えば照明とカメラとからなる表面検査装置によって検査される。検査装置の例としては、例えば、特許文献１に開示された技術がある。 In the steel industry, steel strips with a thickness of about 0.1 mm to 10 mm for home appliances, automobiles, etc. are generally wound in a coil and shipped. The surface of the steel strip is inspected by a surface inspection device composed of, for example, an illumination and a camera before shipment. As an example of the inspection apparatus, for example, there is a technique disclosed in Patent Document 1.
一方、鋼帯の製造過程においては、表面だけでなくコイル状鋼帯の側面にも、割れ、擦れ、折れ曲がりなどの欠陥を生じる場合がある。このような欠陥の検出においても、照明とカメラを用いた、例えば、特許文献２に開示された技術がある。この技術は、同一サイズに四角く切断され、側面を揃えて重ねられた金属板の端部の折れ曲がりを検出するものである。 On the other hand, in the manufacturing process of the steel strip, defects such as cracking, rubbing and bending may occur not only on the surface but also on the side surface of the coiled steel strip. For detection of such defects, there is a technique disclosed in Patent Document 2, for example, using illumination and a camera. This technique detects bending of the end of a metal plate that is cut into a square of the same size and stacked with the side surfaces aligned.
光源とカメラを構成要素としたこうした検査装置は、特許文献のみならず、広く一般に市販されており、鉄鋼製品においても多くの対象に利用されている。 Such an inspection apparatus including a light source and a camera as constituent elements is widely available not only in patent documents but also in general, and is used for many objects in steel products.
しかしながら、コイル状鋼帯においては、鋼帯の巻き取り時に巻き乱れが生じ、コイル側面に凹凸ができる場合がある。鋼帯の厚さが1mmであれば、凹部の間隔も1mmあり、巻き乱れが大きいと凹部が側面より深くなって光源の光が充分届かず、鋼帯の側面を隈無く検査することが困難となる。 However, in a coiled steel strip, winding disturbance may occur when the steel strip is wound, and the coil side surface may be uneven. If the thickness of the steel strip is 1 mm, the spacing between the recesses is also 1 mm, and if the turbulence is large, the recesses will be deeper than the side surface and the light from the light source will not reach sufficiently, making it difficult to inspect the side of the steel strip without much damage. It becomes.
コイル状鋼帯の凹部まで光源の光を充分届かせるという観点で構成された検査装置は、これまでに提案例がない。従って、このようなコイル側面の検査は、コイル状鋼帯至近において検査員が懐中電灯を持って凹部奥を覗きながら、手作業による検査をこれまで行ってきていた。さらに、熱延工程における製造直後のコイル状鋼帯の場合は非常に高温であるため、検査員はある程度製品から離れ、双眼鏡などを用いて行う簡略な検査しか行うことができなかった。 There has been no proposed example of an inspection apparatus configured from the viewpoint of sufficiently reaching the light of the light source to the concave portion of the coiled steel strip. Therefore, such an inspection of the coil side surface has been carried out manually by an inspector in the vicinity of the coiled steel strip while holding a flashlight and looking into the back of the recess. Furthermore, in the case of a coiled steel strip immediately after manufacture in the hot rolling process, the temperature is very high, so that the inspector can move away from the product to some extent and only perform a simple inspection using binoculars or the like.
以上のような背景により、巻き乱れのあるコイル状鋼帯の側面を隈無く撮像することが可能な装置が必要とされていた。 In view of the background described above, an apparatus capable of capturing images of the side surface of a coiled steel strip with turbulence without any distortion has been required.
鋼帯をコイル状に巻く工程において、側面の位置を完全に揃えることは困難であり、凹凸が生じてしまう。図６に、コイル状鋼帯１の概観を示す斜視図を、また図７に、従来の方法を用いてコイル状鋼帯側面の一部を撮像した画像例をそれぞれ示す。図７から判るように、コイル状鋼帯の側面は凹凸が多く、光源からの光が強い陰影をもたらすため、側面から引っ込んだコイル状鋼帯の側面は検査が困難である。 In the process of winding the steel strip in a coil shape, it is difficult to completely align the positions of the side surfaces, resulting in unevenness. FIG. 6 shows a perspective view showing an overview of the coiled steel strip 1, and FIG. 7 shows an example of an image obtained by imaging a part of the side surface of the coiled steel strip using a conventional method. As can be seen from FIG. 7, the side surface of the coiled steel strip has many irregularities, and the light from the light source causes a strong shadow, so the side surface of the coiled steel strip retracted from the side surface is difficult to inspect.
次に、陰影が強く生じる理由を、図８を用いて説明する。光源２の発光面は、コイル状鋼帯１の側面を照射する。このとき、光源２からの光３の内、コイル状鋼帯側面の凹部１２の正面にある光源２からの光はコイル状鋼帯側面の凹部１２の奥まで達するが、発光面の他の多くの箇所からの光３がコイル状鋼帯側面の凹部１２以外のコイル状鋼帯１の側面を照射し、その総量としての輝度が凹部を照射する輝度よりも大幅に強いために、凹部は相対的に暗くなる。これは光源が平行光になっておらず、発光面の各部がそれぞれ点光源を成しているからであると考えられる。これはすなわち、凹部へ届く単位面積当たりの光量が、他の側面より極端に少なくなる、とも表現できる。 Next, the reason why the shadow is strong will be described with reference to FIG. The light emitting surface of the light source 2 irradiates the side surface of the coiled steel strip 1. At this time, of the light 3 from the light source 2, the light from the light source 2 in front of the concave portion 12 on the side surface of the coiled steel strip reaches the back of the concave portion 12 on the side surface of the coiled steel strip. Since the light 3 from the portion irradiates the side surface of the coiled steel strip 1 other than the concave portion 12 on the side surface of the coiled steel strip, and the luminance as the total amount is significantly stronger than the luminance to irradiate the concave portion, Becomes darker. This is presumably because the light source is not parallel light, and each part of the light emitting surface forms a point light source. In other words, it can be expressed that the amount of light per unit area reaching the recess is extremely less than other aspects.
このような理由で、コイル状鋼帯の側面は図７の画像例が示すように、明暗の激しい状態となる。コイル状鋼帯側面の凹部１２の奥まで観察するためには凹部のみを照射する、例えば、懐中電灯のような器具を要する。 For this reason, the side surface of the coiled steel strip is in a bright and dark state as shown in the image example of FIG. In order to observe the depth of the concave portion 12 on the side surface of the coiled steel strip, an instrument such as a flashlight is required to irradiate only the concave portion.
一方、鋼帯の側面は、製造工程の様々な箇所でガイド装置などと部分的に擦れ合う。熱延工程においては、鋼帯の側面は酸化によって黒ずんでいるが、擦れた箇所は金属の地肌が現れて光沢を呈する。このような、黒ずんだ部分と光沢のある部分が混在した側面に対して光源を照射すると、酸化部分と金属地肌の部分の反射率が極端に異なることから、反射輝度の大きな部分と、反射の暗い部分が生じやすく、凹凸と同様に明暗の差が激しくなって良好な観察が困難となる場合がある。 On the other hand, the side surface of the steel strip partially rubs against the guide device or the like at various points in the manufacturing process. In the hot rolling process, the side surface of the steel strip is darkened due to oxidation, but the rubbing portion shows a metallic background and is glossy. When illuminating a light source on a side where black parts and glossy parts are mixed, the reflectance of the oxidized part and the metal background part is extremely different. A dark part is likely to occur, and the difference between brightness and darkness may become severe as in the case of unevenness, which may make it difficult to perform good observation.
以上のことから、コイル状鋼帯の側面を撮像する際の課題は、下記の２点にまとめることができる。 From the above, the problems when imaging the side surface of the coiled steel strip can be summarized in the following two points.
(1) コイル側面には深い溝が形成されており、凹部の輝度が極端に低いため、良好な画像が得られない。 (1) A deep groove is formed on the side surface of the coil, and the brightness of the recess is extremely low, so that a good image cannot be obtained.
(2) コイル側面は反射率の大きく異なる箇所が混在し、的確な照明を行わないと良好な画像が得られない。 (2) The coil side face has a lot of parts with different reflectivities, and a good image cannot be obtained without proper illumination.
以上説明したように、一般に鋼板表面を検査するために使用される装置の構成では、良好な画像を得ることができず、コイル状鋼帯の側面の検査は困難である。 As described above, in the configuration of an apparatus generally used for inspecting the surface of a steel sheet, a good image cannot be obtained, and it is difficult to inspect the side surface of the coiled steel strip.
本発明では、これら従来技術の問題点に鑑み考案されたものであり、巻き乱れがあり、かつ反射率の大きく異なる箇所が混在するような、コイル状鋼帯の側面を良好に撮像することができる、コイル状鋼帯の側面撮像方法および側面観察装置を提供することを課題とする。 In the present invention, it was devised in view of the problems of these prior arts, and it is possible to satisfactorily image the side surface of a coiled steel strip that has turbulence and a mixture of locations with greatly different reflectivities. It is an object of the present invention to provide a side surface imaging method and a side surface observation apparatus for a coiled steel strip.
本発明の請求項１に係る発明は、コイル状に巻かれた鋼帯の側面に照明装置から光を照射し、照射された前記鋼帯の側面を撮像装置により撮像し、撮像した画像を表示装置に表示し、表示された画像に基づいて前記鋼帯の幅端部に発生する欠陥および／または形状不良の検査を行うためのコイル状鋼帯の側面撮像方法であって、前記照明装置および前記撮像装置を、前記鋼帯の側面から下記式で表される距離Ｌだけ離して設置することを特徴とするコイル状鋼帯の側面撮像方法である。 The invention according to claim 1 of the present invention irradiates light from a lighting device onto a side surface of a steel strip wound in a coil shape, images the side surface of the irradiated steel strip with an imaging device, and displays the captured image. A method for imaging a side surface of a coiled steel strip for inspecting a defect and / or a shape defect occurring at a width end portion of the steel strip based on the displayed image displayed on the apparatus, the lighting device and It is a side imaging method of a coiled steel strip characterized in that the imaging device is installed away from the side of the steel strip by a distance L represented by the following formula.
Ｌ≧ｙ×Ｄ／（２ｄ）
ここで、
ｙ ：想定されるコイル状鋼帯の巻き乱れによる凹凸深さ
Ｄ ：コイル状鋼帯の半径
ｄ ：鋼帯の厚さ
また、本発明の請求項２に係る発明は、請求項１記載のコイル状鋼帯の側面撮像方法において、前記照明装置および前記撮像装置の光軸を、前記鋼帯の中心軸方向に対して、１°〜１５°傾斜させて、かつ、前記撮像装置が正反射光を受光しないように配置させることを特徴とするコイル状鋼帯の側面撮像方法である。
L ≧ y × D / (2d)
here,
y: Depth of unevenness due to coiled steel strip winding disorder
D: Radius of coiled steel strip
d: Thickness of steel strip Further, the invention according to claim 2 of the present invention is the method of imaging a side surface of the coiled steel strip according to claim 1, wherein the optical axis of the illumination device and the imaging device is the steel strip. A side surface imaging method for a coiled steel strip, wherein the imaging device is arranged so as to be inclined by 1 ° to 15 ° with respect to the central axis direction of the lens and so that the imaging device does not receive specularly reflected light.
さらに、本発明の請求項３に係る発明は、コイル状に巻かれた鋼帯の側面に光を照射する照明装置と、照射された前記鋼帯の側面を撮像する撮像装置と、撮像した画像を表示する表示装置とを具備するコイル状鋼帯の側面撮像装置であって、前記照明装置および前記撮像装置を、前記鋼帯の側面から下記式で表される距離Ｌ離すとともに、前記照明装置および前記撮像装置の光軸を、前記鋼帯の中心軸方向に対して、１°〜１５°傾斜させて、かつ、前記撮像装置が正反射光を受光しないように配置させることを特徴とするコイル状鋼帯の側面観察装置である。 Furthermore, the invention according to claim 3 of the present invention is an illumination device that irradiates light on a side surface of a steel strip wound in a coil shape, an imaging device that images the side surface of the irradiated steel strip, and a captured image. And a display device for displaying the coil-shaped steel strip, wherein the illumination device and the imaging device are separated from the side surface of the steel strip by a distance L represented by the following formula, and the illumination device The optical axis of the imaging device is inclined by 1 ° to 15 ° with respect to the central axis direction of the steel strip, and the imaging device is arranged so as not to receive regular reflection light. It is a side observation device of a coiled steel strip.
Ｌ≧ｙ×Ｄ／（２ｄ）
ここで、
ｙ ：想定されるコイル状鋼帯の巻き乱れによる凹凸深さ
Ｄ ：コイル状鋼帯の半径
ｄ ：鋼帯の厚さ
L ≧ y × D / (2d)
here,
y: Depth of unevenness due to coiled steel strip winding disorder
D: Radius of coiled steel strip
d: Steel strip thickness
本発明によれば、巻き乱れによって側面に凹凸のできたコイル状鋼帯であっても、光源からの光が凹部の奥まで届き、良好に画像を得ることができる。このため従来は困難であった、画像によるコイル状鋼帯の側面の検査が可能となった。 According to the present invention, even if the coiled steel strip has irregularities on the side surfaces due to winding disturbance, the light from the light source reaches the back of the concave portion, and an image can be obtained satisfactorily. For this reason, it was possible to inspect the side surface of the coiled steel strip by image, which was difficult in the past.
また、熱延工程直後のコイル状鋼帯は高温であるために、このようなコイル状鋼帯間近での危険な目視作業を無くすことができた。さらに、コイル状鋼帯の側面の画像が均一な輝度で得られるため、画像処理による自動検査に容易に移行することができ、検査の確実性が向上した。 Moreover, since the coiled steel strip immediately after the hot rolling step is at a high temperature, it was possible to eliminate such dangerous visual work near the coiled steel strip. Furthermore, since the image of the side surface of the coiled steel strip can be obtained with uniform brightness, it is possible to easily shift to automatic inspection by image processing, and the reliability of the inspection is improved.
前述の如く、凹部のみの観察であれば懐中電灯などを用いて部分的に凹部の奥へ光を投入する方法があるが、これでは手間が掛かり現実の製造工程における実用化に不向きである。 As described above, there is a method of partially injecting light into the back of the recess using a flashlight or the like for observing only the recess, but this takes time and is not suitable for practical use in an actual manufacturing process.
この課題を解決するには、凹部と、それ以外の側面への照射光量を均等化する必要があり、そのためには平行光を用いる方法がある。例えば太陽光を用いると、この課題は解決される。図９に示すように、平行光による照明においては、凹部の奥に届く単位面積当たりの光量と、側面部に届く単位面積辺りの光量は等しくなり、極端な輝度差を生じないからである。 In order to solve this problem, it is necessary to equalize the amount of light applied to the concave portions and the other side surfaces. For this purpose, there is a method using parallel light. For example, when sunlight is used, this problem is solved. As shown in FIG. 9, in the illumination with parallel light, the amount of light per unit area reaching the back of the recess is equal to the amount of light per unit area reaching the side surface, and no extreme luminance difference occurs.
平行光を作り出す技術としては、点光源からの光を、放物面鏡を用いて平行にする方法があるが、コイル状鋼帯の直径は通常２メートル程度であり、このような大型の放物面鏡を用いることは、製作コスト及び保守上からもほぼ不可能である。 As a technique for creating parallel light, there is a method in which light from a point light source is made parallel by using a parabolic mirror. The diameter of a coiled steel strip is usually about 2 meters, and such a large-sized light is emitted. The use of an object mirror is almost impossible in terms of manufacturing cost and maintenance.
そこで本発明では、光源を、コイル状鋼帯から一定の距離を離して設置することで、擬似的な平行光源を形成する。光源を遠方へ設置するほど平行度の高い光が得られるが、工場内部に設置する制限により、ある範囲内で最大限の距離を取ることとする。 Therefore, in the present invention, a pseudo parallel light source is formed by installing the light source at a certain distance from the coiled steel strip. As the light source is placed farther away, light with higher parallelism can be obtained. However, due to the restriction of installing in the factory, the maximum distance is assumed within a certain range.
ここで、図１を用いて、コイル状鋼帯側面の凹部の奥へ光を届けるための条件を示す。光源２からコイル状鋼帯１の平均的側面までの距離をＬ、コイル状鋼帯１の半径をＤとし、光源２はコイル状鋼帯１の中心位置に設置するものとする。コイル状鋼帯側面の凹部１２の深さをｙ、凹部の幅すなわち鋼帯の厚さをｄとすると、光源２からコイル状鋼帯側面の凹部１２へ達する光３を挟んだ相似形より、下記（１）式の関係が得られる。 Here, the conditions for delivering light to the back of the concave portion on the side surface of the coiled steel strip will be described with reference to FIG. The distance from the light source 2 to the average side surface of the coiled steel strip 1 is L, the radius of the coiled steel strip 1 is D, and the light source 2 is installed at the center position of the coiled steel strip 1. When the depth of the concave portion 12 on the side surface of the coiled steel strip is y and the width of the concave portion, that is, the thickness of the steel strip is d, a similar shape sandwiching the light 3 from the light source 2 to the concave portion 12 on the side surface of the coiled steel strip, The relationship of the following formula (1) is obtained.
Ｄ／ｄ ＝ Ｌ／ｙ ・・・ （１）
コイル状鋼帯の半径を1000mm、巻き乱れによる凹部深さを20mm、鋼帯の厚さを2mmとすると、光源までの距離Ｌは10000mmである。 このようにして、完全な平行光は形成できなくても、従来の照明方法に比べてより多くの光を凹部の奥まで届ける条件を概算することができる。このとき、撮像装置も光源と同じ位置か、若しくは凹部の必要な部分が撮像可能な位置に置くことが必要である。
D / d = L / y (1)
If the radius of the coiled steel strip is 1000 mm, the recess depth due to winding disturbance is 20 mm, and the thickness of the steel strip is 2 mm, the distance L to the light source is 10000 mm. In this way, even if perfect parallel light cannot be formed, it is possible to estimate the conditions for delivering more light to the back of the recess compared to conventional illumination methods. At this time, it is necessary to place the imaging device at the same position as the light source or at a position where the necessary portion of the recess can be imaged.
本発明者らの実験によれば、鋼帯の厚みが0.2mm乃至5mm程度で、かつ凹部の深さが40mm程度までの場合、光源を5m程度離せば、図１の破線で示す付加的な光によって、凹部は充分な明るさで照射されることが判明した。 According to the experiments by the present inventors, when the thickness of the steel strip is about 0.2 mm to 5 mm and the depth of the recess is up to about 40 mm, the additional light source indicated by the broken line in FIG. It was found that the concave portion was irradiated with sufficient brightness by light.
したがって、光源(照明装置)およびカメラ(撮像装置)を、コイル状鋼帯の側面から下記（２）で表される距離Ｌだけ離して設置する。 Therefore, the light source (illuminating device) and the camera (imaging device) are installed apart from the side surface of the coiled steel strip by a distance L represented by the following (2).
Ｌ≧ｙ×Ｄ／（２ｄ） ・・・ （２）
以上のことから、コイル状鋼帯の側面を均等な輝度で観察または撮像することが可能となる。しかしながら、前記課題の(2)に述べた通り、鋼帯の側面には反射率のむらという問題が残っている。特に、金属の地肌が露出している部分は反射率が高く、例えば図１において、光源とほぼ同じ位置にカメラを設置して撮像すると、反射が強すぎる箇所が現れて、ハレーションを生じる場合がある。これは、光源からの正反射光が直接カメラに入るためである。
L ≧ y × D / (2d) (2)
From the above, the side surface of the coiled steel strip can be observed or imaged with uniform brightness. However, as described in the above problem (2), the problem of uneven reflectance remains on the side surface of the steel strip. In particular, a portion where the metal background is exposed has a high reflectance. For example, in FIG. 1, when a camera is installed at approximately the same position as the light source, an area where reflection is too strong appears and halation may occur. is there. This is because specularly reflected light from the light source directly enters the camera.
そこで本発明では、凹部に光を届ける条件を満たしながら、光源の反射光が撮像装置に直接入らない配置の仕方を考案した。図２に、この配置の仕方を説明する平面図を示す。 Therefore, the present invention has devised an arrangement method in which the reflected light of the light source does not directly enter the imaging device while satisfying the condition for delivering light to the recess. FIG. 2 is a plan view for explaining the arrangement method.
コイル状鋼帯１の側面から垂直な線に対し、光源２を１〜１５°傾けた角度に設置し光を照射する。そして、撮像装置４も、同一の方向へ１〜１５°傾けた角度に設置しコイル状鋼帯１の側面からの反射光を撮像する。このようにすることで、コイル状鋼帯の表面で反射した光が、撮像装置に直接入射することを避けることができ、コイル状鋼帯の側面に金属地肌が露出した反射率の高い箇所があっても、画像がハレーションを起こすことを回避できる。 The light source 2 is installed at an angle of 1 to 15 ° with respect to a line perpendicular to the side surface of the coiled steel strip 1 and light is irradiated. And the imaging device 4 is also installed in the angle inclined 1-15 degrees to the same direction, and images the reflected light from the side surface of the coiled steel strip 1. FIG. By doing in this way, the light reflected on the surface of the coiled steel strip can be prevented from directly entering the imaging device, and there is a highly reflective portion where the metal background is exposed on the side surface of the coiled steel strip. Even if it exists, it can avoid that an image causes halation.
本発明の要件を満たした装置構成によって撮影した、巻き乱れのあるコイル状鋼帯の側面の画像を、図３に示す。従来の装置にて撮影した前述の図７の画像に比べて、コイル状鋼帯の側面が均一な輝度で観察可能なことが確認できる。 FIG. 3 shows an image of a side surface of a coiled steel strip having a turbulence, taken by an apparatus configuration that satisfies the requirements of the present invention. It can be confirmed that the side surface of the coiled steel strip can be observed with a uniform luminance as compared with the image of FIG. 7 taken with a conventional apparatus.
本発明の実施例の装置配置（横面図）を図４に示す。コイル状鋼帯１の直径は1.5m、幅は50cm乃至2mである。コイル状鋼帯１の両側面を撮影するために、コイル状鋼帯１の両側に、光源２，７ならびに撮像装置４，５，６，８を配置した。撮像装置としては、1600万画素の高精細カメラに、焦点距離200mmの望遠レンズを装着し、コイル状鋼帯の中心位置から8mの距離に上下２台を配置した。片面に複数台のカメラを配置することで、分解能をより高く設定することができる。本実施例では約0.3mmの分解能を設定した。 FIG. 4 shows an apparatus arrangement (horizontal view) according to the embodiment of the present invention. The coiled steel strip 1 has a diameter of 1.5 m and a width of 50 cm to 2 m. In order to photograph both side surfaces of the coiled steel strip 1, light sources 2 and 7 and imaging devices 4, 5, 6, and 8 were arranged on both sides of the coiled steel strip 1. As the imaging device, a high-definition camera with 16 million pixels was equipped with a telephoto lens with a focal length of 200 mm, and two units were placed up and down at a distance of 8 m from the center position of the coiled steel strip. By arranging a plurality of cameras on one side, the resolution can be set higher. In this example, a resolution of about 0.3 mm was set.
本実施例で用いた光源は、サーチライト状の光を照射できる500W乃至1500Wの光源であり、撮像時以外は図示しないシャッタによって光が遮断されている。光源１台でコイル状鋼帯１の片面全体を照射する。図４の装置の平面配置は、図２に示した配置と同様であり、本実施例では、光源、カメラ共に7°傾けた位置に配置した。 The light source used in this embodiment is a 500 W to 1500 W light source capable of emitting searchlight-like light, and light is blocked by a shutter (not shown) except during imaging. The entire surface of the coiled steel strip 1 is irradiated with one light source. The planar arrangement of the apparatus of FIG. 4 is the same as the arrangement shown in FIG. 2, and in this embodiment, both the light source and the camera are arranged at a position inclined by 7 °.
カメラ及び光源は地面に固定されており、コイル状鋼帯１は、後述する搬送台車に載ってカメラ視野の位置に入った際、光源２および７のシャッタが開き、撮像が行われる。 The camera and the light source are fixed to the ground, and when the coiled steel strip 1 is placed on a transport carriage, which will be described later, and enters the position of the camera field of view, the shutters of the light sources 2 and 7 are opened and imaging is performed.
図５は、本発明を用いた検査システムの構成例を示す図である。搬送台車９に載ったコイル状鋼帯１には固有の番号が付けられており、図示しない上位のコンピュータとコンピュータ１０との通信によって、搬送台車９よって運ばれてくるコイル状鋼帯１の番号を認識する。図４に示した光学装置の前に搬送台車９に載ったコイル状鋼帯１がくると、コイル状鋼帯１の両側面の撮像が行われ、その画像データはコンピュータ１０に記録されると同時に、画像処理によって欠陥の検出が行われる。 FIG. 5 is a diagram showing a configuration example of an inspection system using the present invention. The coiled steel strip 1 mounted on the transport carriage 9 is assigned a unique number, and the number of the coiled steel strip 1 carried by the transport carriage 9 by communication between a computer (not shown) and the computer 10. Recognize When the coiled steel strip 1 placed on the transport carriage 9 comes in front of the optical device shown in FIG. 4, both sides of the coiled steel strip 1 are imaged and the image data is recorded in the computer 10. At the same time, defects are detected by image processing.
また、画像及び検査データは、ディスプレイ装置１１によってオペレータに提示される。オペレータは、必要に応じて画像を拡大するなどしてコイル状鋼帯製品側面を観察し、欠陥の有無、異常などを判断する。なお、ディスプレイ装置１１には高精細の大型ディスプレイ装置を用いるようにすると、欠陥の有無、異常などの判断を確実にでき好適である。 Further, the image and the inspection data are presented to the operator by the display device 11. The operator observes the side surface of the coiled steel strip product by enlarging the image as necessary, and judges the presence / absence of defects, abnormality, and the like. Note that it is preferable to use a high-definition large-sized display device as the display device 11 because it is possible to reliably determine the presence / absence or abnormality of a defect.
以上説明したように本発明を活用することで、これまでコイル状鋼帯製品の間近に寄って、目視にて検査する必要のあった、コイル状鋼帯製品の検査がリモート化された。 As described above, by utilizing the present invention, the inspection of the coiled steel strip product, which has so far been close to the coiled steel strip product and had to be visually inspected, has been made remote.
１ コイル状鋼帯
２ 光源
３ 光
４ 撮像装置
５ 撮像装置
６ 撮像装置
７ 光源
８ 撮像装置
９ 搬送台車
１０ コンピュータ
１１ ディスプレイ装置
１２ コイル状鋼帯側面の凹部
DESCRIPTION OF SYMBOLS 1 Coiled steel strip 2 Light source 3 Light 4 Imaging device 5 Imaging device 6 Imaging device 7 Light source 8 Imaging device 9 Carriage cart 10 Computer 11 Display device 12 Concave part of coiled steel strip side surface
Claims (3)
照射された前記鋼帯の側面を撮像装置により撮像し、
撮像した画像を表示装置に表示し、
表示された画像に基づいて前記鋼帯の幅端部に発生する欠陥および／または形状不良の検査を行うためのコイル状鋼帯の側面撮像方法であって、
前記照明装置および前記撮像装置を、前記鋼帯の側面から下記式で表される距離Ｌだけ離して設置することを特徴とするコイル状鋼帯の側面撮像方法。
Ｌ≧ｙ×Ｄ／（２ｄ）
ここで、
ｙ ：想定されるコイル状鋼帯の巻き乱れによる凹凸深さ
Ｄ ：コイル状鋼帯の半径
ｄ ：鋼帯の厚さ Irradiate light from the lighting device to the side of the steel strip wound in a coil,
The side surface of the irradiated steel strip is imaged by an imaging device,
Display the captured image on the display device,
A method for imaging a side surface of a coiled steel strip for inspecting defects and / or shape defects occurring in a width end portion of the steel strip based on a displayed image,
A method of imaging a side surface of a coiled steel strip, wherein the illumination device and the imaging device are installed apart from a side surface of the steel strip by a distance L represented by the following formula.
L ≧ y × D / (2d)
here,
y: Depth of unevenness due to coiled steel strip winding disorder
D: Radius of coiled steel strip
d: Steel strip thickness
前記照明装置および前記撮像装置の光軸を、前記鋼帯の中心軸方向に対して、１°〜１５°傾斜させて、かつ、前記撮像装置が正反射光を受光しないように配置させることを特徴とするコイル状鋼帯の側面撮像方法。 In the side imaging method of the coiled steel strip according to claim 1,
The optical axis of the illuminating device and the imaging device is inclined by 1 ° to 15 ° with respect to the central axis direction of the steel strip, and the imaging device is arranged not to receive regular reflection light. A side imaging method of a coiled steel strip as a feature.
照射された前記鋼帯の側面を撮像する撮像装置と、
撮像した画像を表示する表示装置とを具備するコイル状鋼帯の側面撮像装置であって、
前記照明装置および前記撮像装置を、前記鋼帯の側面から下記式で表される距離Ｌ離すとともに、
前記照明装置および前記撮像装置の光軸を、前記鋼帯の中心軸方向に対して、１°〜１５°傾斜させて、かつ、前記撮像装置が正反射光を受光しないように配置させることを特徴とするコイル状鋼帯の側面観察装置。
Ｌ≧ｙ×Ｄ／（２ｄ）
ここで、
ｙ ：想定されるコイル状鋼帯の巻き乱れによる凹凸深さ
Ｄ ：コイル状鋼帯の半径
ｄ ：鋼帯の厚さ A lighting device for irradiating light on the side surface of a steel strip wound in a coil;
An imaging device for imaging the side surface of the irradiated steel strip;
A side surface imaging device for a coiled steel strip comprising a display device for displaying a captured image,
The lighting device and the imaging device are separated from the side surface of the steel strip by a distance L represented by the following formula,
The optical axis of the illuminating device and the imaging device is inclined by 1 ° to 15 ° with respect to the central axis direction of the steel strip, and the imaging device is arranged not to receive regular reflection light. A side view observation device for coiled steel strip.
L ≧ y × D / (2d)
here,
y: Depth of unevenness due to coiled steel strip winding disorder
D: Radius of coiled steel strip
d: Steel strip thickness
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