JP2014115217A - Plate width measurement method and plate width measurement device - Google Patents
Plate width measurement method and plate width measurement device Download PDFInfo
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Description
本発明は、薄板の製造ラインにて搬送中の鋼材やチタン材などの帯状体について、該帯状体の板幅を連続的に計測する板幅計測方法及び板幅計測装置に関する。 The present invention relates to a plate width measuring method and a plate width measuring device for continuously measuring a plate width of a strip-like body such as a steel material or a titanium material being conveyed on a thin plate production line.
薄板に代表される鋼材やチタン材などの帯状体（言い換えれば、コイル材）の歩留を向上させる活動の一環として、板幅変動の抑制や板幅設計精度等の改善によって、余幅ロスを低減させる取り組みがおこなわれている。
従来は、板幅の変動量が比較的大きな熱間圧延工程における板幅変動の抑制への取り組みが主体であったが、近年は、コイル材のさらなる品質向上のために、冷間圧延や連続焼鈍工程等における比較的小さな板幅変動についても抑制の対象となりつつあり、それら各工程においても、板幅を精密に計測する必要が生じている。
As part of our activities to improve the yield of strips (in other words, coil materials) such as steel and titanium, which are represented by thin plates, we are able to reduce excess width loss by reducing plate width variation and improving plate width design accuracy. Efforts to reduce are being made.
Previously, the main focus was on the suppression of sheet width variation in the hot rolling process, where the amount of variation in sheet width was relatively large, but in recent years, cold rolling and continuous Relatively small plate width fluctuations in the annealing process and the like are also becoming targets of suppression, and in each of these processes, it is necessary to accurately measure the plate width.
従来の板幅計測技術としては、イメージセンサを有するカメラを用い、カメラが視認すべき板材に対して照明光を当て、板材の幅方向における端部の輪郭をカメラで視認して板幅を検出する方法が一般的である。特許文献１〜３は、このような板幅計測技術を開示する。
特許文献１に開示の板材の幅寸法・形状測定装置は、板材の適長部分における幅方向両端部を照明する照明灯と、１台の１次元又は２次元の受像装置と、２つの鏡面を有する２面鏡体とを具備し、前記受像装置及び２面鏡体は、前記照明灯にて照明された板材幅方向の各端部の端縁を夫々にのみ含む適宜領域の、前記２面鏡体の各鏡面に映じた像を受像装置が捉えるべく配してなることを特徴とするものである。
As a conventional plate width measurement technology, a camera with an image sensor is used, illumination light is applied to the plate material to be visually recognized by the camera, and the edge width in the width direction of the plate material is visually recognized by the camera to detect the plate width. The method to do is common. Patent Documents 1 to 3 disclose such a plate width measuring technique.
The apparatus for measuring the width and shape of a plate material disclosed in Patent Document 1 includes an illumination lamp that illuminates both ends in the width direction of an appropriate length portion of the plate material, a single one-dimensional or two-dimensional image receiving device, and two mirror surfaces. The two-sided mirror body, and the image-receiving device and the two-sided mirror body in the appropriate area including only the edge of each end in the width direction of the plate illuminated by the illumination lamp. The image receiving device is arranged so that an image reflected on each mirror surface of the mirror body is captured.
特許文献２に開示の板の寸法測定方法は、Ｘ−Ｙテーブルに搭載したＣＣＤカメラにより板の辺及びコーナーを視認して、前記板の幅及び長さ等の寸法を測定する際に、前記板の斜め上方から前記板の辺及びコーナーに向かって傾斜光線による照明を当てて、前記板の辺の外側方にできる影により前記辺の縁との境を視認して前記板の辺及びコーナー位置を測定し寸法を算出することを特徴とするものである。 In the method for measuring the dimensions of a plate disclosed in Patent Document 2, the sides and corners of the plate are visually recognized by a CCD camera mounted on an XY table, and the dimensions such as the width and length of the plate are measured. Illumination by inclined light rays is applied from the diagonally upper side of the plate toward the sides and corners of the plate, and the boundary between the sides of the plate is visually recognized by a shadow formed on the outer side of the side of the plate. It measures the position and calculates the dimensions.
特許文献３に開示の帯状体の表面検査装置は、搬送される帯状体のエッジを含む領域であるエッジ部の形状を表す形状画像と、該エッジ部の輝度画像とを、それぞれフレーム画像として生成する帯状体の表面検査装置において、前記形状画像一フレーム毎に、前記帯状体の幅方向各位置において、予め設定された間隔で帯状体の長手方向に沿っての急峻度の最大値である長手方向急峻度最大値を求め、幅方向各位置と長手方向急峻度最大値との関係である最大急峻度プロフィールを生成し、該最大急峻度プロフィールから、該長手方向急峻度最大値が予め設定された閾値と等しくなる幅方向位置を形状欠陥幅として算出する形状欠陥幅算出手段と、前記輝度画像一フレーム毎に、画像処理を行って、前記帯状体のエッジ部の有害な表面疵を検出し、該表面疵の幅位置を基に、有害な表面疵のエッジからの幅方向距離の最大値である表面疵幅を算出する表面疵幅算出手段と、前記形状欠陥幅と前記表面疵幅とを比較して、値が大きい方を、エッジ部欠陥を切除する帯状体幅方向位置であるエッジ欠陥切除位置として出力するエッジ欠陥切除位置出力手段とを備えることを特徴とするものである。 The band-shaped surface inspection apparatus disclosed in Patent Document 3 generates a shape image representing the shape of an edge portion, which is an area including an edge of a conveyed band-shaped body, and a luminance image of the edge portion as frame images. In the surface inspection apparatus for the band-shaped body, the longitudinal length which is the maximum value of the steepness along the longitudinal direction of the band-shaped body at a predetermined interval at each position in the width direction of the band-shaped body for each frame of the shape image. A maximum direction steepness value is obtained, a maximum steepness profile that is the relationship between each position in the width direction and the maximum length steepness value is generated, and the maximum value of the steepness in the longitudinal direction is preset from the maximum steepness profile. A shape defect width calculation means for calculating a position in the width direction equal to the threshold value as a shape defect width, and image processing is performed for each frame of the luminance image to detect harmful surface defects at the edge of the strip. And a surface wrinkle width calculating means for calculating a surface wrinkle width which is a maximum value of the distance in the width direction from the edge of the harmful surface wrinkles based on the width position of the surface wrinkles, and the shape defect width and the surface wrinkle width And edge defect excision position output means for outputting an edge defect having a larger value as an edge defect excision position which is a position in the width direction of the strip for excising the edge portion defect.
しかし、上述の特許文献１〜３に開示の技術は、特に照明装置等の設備を導入するためのコストが大きく、薄板の熱延工程以降に存在する数多くの下工程に導入するのは困難である。
さらに、板材に、例えば耳波形状などの形状不良が存在した場合、また、各工程を通過する板材が振動（パスライン変動）する場合において、上述の特許文献は、パスライン変動を抑制することがでないだけでなく、板材の中波や耳波などの形状不良を潜在化（平坦化）することもできない。そのため、カメラのイメージセンサで検出される板材の幅方向における端部の輪郭位置がずれてしまい、板幅の計測精度に影響を及ぼすといった問題が生じる。
However, the techniques disclosed in Patent Documents 1 to 3 described above are particularly expensive to introduce equipment such as a lighting device, and it is difficult to introduce them into many lower processes existing after the hot rolling process of a thin plate. is there.
Further, when a shape defect such as an acoustic wave shape exists in the plate material, or when the plate material passing through each process vibrates (pass line fluctuation), the above-mentioned patent document suppresses the pass line fluctuation. Not only is it not possible, but it is also impossible to latentize (planarize) shape defects such as medium waves and ear waves of the plate material. For this reason, the contour position of the end portion in the width direction of the plate material detected by the image sensor of the camera is shifted, which causes a problem of affecting the measurement accuracy of the plate width.
加えて、カメラで視認する板材と板材の背景は共に金属であることが多いので、板材の表面と背景である搬送ロールの表面の色彩が近い場合や、各々の表面に色彩ムラがある場合が発生する。このような場合、カメラのイメージセンサによって、板材端部の視認に必要なコントラストを安定して得るのは困難である。
本発明は、上述の問題に鑑みてなされたものであって、形状の悪い薄板であっても、その板幅を薄板の全長にわたって低コストで精度良く計測することができる板幅計測方法及び板幅計測装置を提供することを目的とする。
In addition, since the plate material and the background of the plate material that are visually recognized by the camera are often metal, the color of the surface of the plate material and the surface of the transport roll that is the background may be close, or there may be uneven color on each surface. Occur. In such a case, it is difficult to stably obtain the contrast necessary for visually recognizing the end portion of the plate by the image sensor of the camera.
The present invention has been made in view of the above-described problems, and a plate width measuring method and a plate capable of accurately measuring the plate width at a low cost over the entire length of the thin plate, even for a thin plate having a poor shape. An object is to provide a width measuring device.
上記課題を達成するために、本発明は、以下の技術的手段を採用した。
本発明に係る板幅計測方法は、搬送ロールに巻き掛けられて搬送される薄板の幅方向両端の位置を検出し、前記検出された両端の位置を基に前記薄板の板幅を計測する板幅計測方法であって、前記搬送ロールに所定の張力をもって巻き掛けられた薄板の両端の陰影を形成する陰影形成工程と、前記陰影形成工程によって形成された前記薄板の両端の陰影を含む画像を撮像する撮像工程と、前記撮像工程によって撮像された画像中における前記両端の陰影の位置を基に、前記薄板の両端の位置を検出する端部位置検出工程と、を備えることを特徴とする。
In order to achieve the above object, the present invention employs the following technical means.
The plate width measuring method according to the present invention is a plate that detects positions of both ends in the width direction of a thin plate that is wound around and conveyed by a transport roll, and measures the plate width of the thin plate based on the detected positions of both ends. A width measurement method comprising: forming a shadow at both ends of a thin plate wound around the transport roll with a predetermined tension; and an image including shadows at both ends of the thin plate formed by the shadow forming step. An imaging step for imaging, and an end position detection step for detecting the positions of both ends of the thin plate based on the positions of the shadows at the both ends in the image captured by the imaging step are provided.
好ましくは、前記陰影形成工程は、前記搬送ロールに巻き掛けられた薄板の幅方向における中央側から前記両端側に向かって光を照射することで、前記両端の陰影を形成する照射工程を有するとよい。
好ましくは、前記所定の張力が、前記薄板の降伏強度の２０％以上４０％以下となる張力であるとよい。
Preferably, the shadow forming step includes an irradiation step of forming shadows at both ends by irradiating light from the center side in the width direction of the thin plate wound around the transport roll toward the both end sides. Good.
Preferably, the predetermined tension is a tension that is 20% to 40% of the yield strength of the thin plate.
本発明に係る板幅計測装置は、搬送ロールに巻き掛けられて搬送される薄板の幅方向両端の位置を検出し、前記検出された両端の位置を基に前記薄板の板幅を計測する板幅計測装置であって、前記搬送ロールに所定の張力をもって巻き掛けられた薄板の両端の陰影を形成する陰影形成部と、前記陰影形成手段によって形成された前記薄板の両端の陰影を含む画像を撮像する撮像部と、前記撮像部によって撮像された画像中における前記両端の陰影の位置を基に、前記薄板の両端の位置を検出する端部位置検出部と、を備えることを特徴とする。 A plate width measuring device according to the present invention detects a position of both ends in the width direction of a thin plate that is wound around and conveyed by a transport roll, and measures the plate width of the thin plate based on the detected positions of both ends. A width measuring device, comprising: a shadow forming portion that forms shadows at both ends of a thin plate wound around the transport roll with a predetermined tension; and an image including shadows at both ends of the thin plate formed by the shadow forming means. An image pickup unit that picks up an image and an end position detection unit that detects the positions of both ends of the thin plate based on the positions of the shadows at the both ends in the image picked up by the image pickup unit are provided.
好ましくは、前記陰影形成部は、前記搬送ロールに巻き掛けられた薄板の幅方向における中央側から前記両端側に向かって光を照射することで、前記両端の陰影を形成する照射装置を有するとよい。
好ましくは、前記所定の張力を、前記薄板の降伏強度の２０％以上４０％以下となる張力とするとよい。
Preferably, the shadow forming unit includes an irradiation device that forms shadows at both ends by irradiating light from the center side in the width direction of the thin plate wound around the transport roll toward the both end sides. Good.
Preferably, the predetermined tension is a tension that is 20% to 40% of the yield strength of the thin plate.
本発明の板幅計測方法及び板幅計測装置によれば、形状の悪い薄板であっても、その板幅を薄板の全長にわたって低コストで精度良く計測することができる。 According to the plate width measuring method and the plate width measuring apparatus of the present invention, even a thin plate having a poor shape can be accurately measured at low cost over the entire length of the thin plate.
以下、図面を参照しながら、本発明の実施形態を説明する。
なお、以下に説明する実施形態は、本発明を具体化した一例であって、その具体例をもって本発明の構成を限定するものではない。従って、本発明の技術的範囲は、本実施形態に開示内容に限定されるものではない。
図１を参照しながら、本実施形態による板幅計測装置の構成、及び板幅計測方法について説明する。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, embodiment described below is an example which actualized this invention, Comprising: The structure of this invention is not limited with the specific example. Therefore, the technical scope of the present invention is not limited to the contents disclosed in the present embodiment.
With reference to FIG. 1, the configuration of the plate width measuring apparatus according to the present embodiment and the plate width measuring method will be described.
図１は、本発明の実施形態による板幅計測装置１の構成の一部を示す概略図である。
図１に示すように、本実施形態による板幅計測装置１は、鋼材やチタン材などの帯状体である薄板（以下、板材という）２の板幅を計測する装置であって、略円柱形状の搬送ロール３に巻き掛けられて搬送される板材２の幅方向両端の位置を検出し、検出された両端の位置を基に板材２の板幅を計測する。
FIG. 1 is a schematic diagram showing a part of the configuration of a plate width measuring apparatus 1 according to an embodiment of the present invention.
As shown in FIG. 1, a plate width measuring device 1 according to the present embodiment is a device that measures a plate width of a thin plate (hereinafter referred to as a plate material) 2 that is a strip-like body such as a steel material or a titanium material, and has a substantially cylindrical shape. The positions of both ends in the width direction of the plate 2 that is wound around the transfer roll 3 and conveyed are detected, and the plate width of the plate 2 is measured based on the detected positions of both ends.
板幅計測装置１は、搬送ロール３に所定の張力をもって巻き掛けられた板材２に対して光を照射し、巻き掛けられた板材２の両端の陰影を形成する照明装置（陰影形成部）４ａ，４ｂと、搬送ロール３の表面に照明装置４ａ，４ｂによって形成された板材２の両端の陰影を含む画像を撮像するカメラ（撮像部）５ａ，５ｂと、カメラ５ａ，５ｂによって撮像された画像中における板材２の両端の陰影の位置を基に、板材２の両端の位置を検出する端部位置検出部（図示せず）と、を備える。 The plate width measuring device 1 irradiates light to the plate material 2 wound around the transport roll 3 with a predetermined tension, and forms a shadow at both ends of the wound plate material 2 (a shadow forming unit) 4a. , 4b, and cameras (imaging units) 5a and 5b that capture images including shadows at both ends of the plate 2 formed on the surface of the transport roll 3 by the illumination devices 4a and 4b, and images captured by the cameras 5a and 5b. An end position detector (not shown) for detecting the positions of both ends of the plate 2 based on the positions of shadows at both ends of the plate 2 inside.
板幅計測装置１は、端部位置検出部によって検出された板材２の両端の位置を用いて板材２の両端間の距離を取得し、取得した距離を板材２の板幅として取得することができる。
図２を参照して、搬送ロール３に対する板材２の配置を説明する。図２は、本実施形態による板幅計測装置１に対する搬送ロール３及び板材２の配置を示す図であって、搬送ロール３及び板材２を略円柱形状の搬送ロール３の軸心方向に沿って見たときの搬送ロール３に対する板材２の配置を示している。従って、図２は、搬送ロール３を軸心に対して垂直な面で切断したときの断面を示しているといえる。
The plate width measuring apparatus 1 can acquire the distance between both ends of the plate material 2 using the positions of both ends of the plate material 2 detected by the end position detection unit, and can acquire the acquired distance as the plate width of the plate material 2. it can.
With reference to FIG. 2, arrangement | positioning of the board | plate material 2 with respect to the conveyance roll 3 is demonstrated. FIG. 2 is a diagram showing the arrangement of the transport roll 3 and the plate material 2 with respect to the plate width measuring apparatus 1 according to the present embodiment, and the transport roll 3 and the plate material 2 are arranged along the axial direction of the substantially cylindrical transport roll 3. The arrangement | positioning of the board | plate material 2 with respect to the conveyance roll 3 when it sees is shown. Therefore, FIG. 2 can be said to show a cross section when the transport roll 3 is cut along a plane perpendicular to the axis.
図１及び図２に示すように、帯状の板材２は、板材２の幅方向が搬送ロール３の軸心方向とほぼ平行となるように、搬送ロール３に巻き掛けられている。このように搬送ロール３と接触する板材２は、軸心を中心に回転する搬送ロール３によって、板材２の長手方向に搬送される。
ここで、図２に示すように、板材２は、搬送ロール３の断面において軸心周りの角度（中心角（θ１））約１３５°に対応する外周面において、搬送ロール３と接触している。このとき、板材２が搬送ロール３に単に接触している（単に載っている）だけでは板材２の振動を防止することができないため、板材２が搬送ロール３へ十分に巻き掛けられ、振動及び揺動することなく安定して搬送されている必要がある。板材２の搬送ロール３への巻き掛け量が多いほど、板材２は安定して搬送されるので、搬送ロール３の外周面で板材２が巻き掛けられた範囲に対応する軸心周りの角度（中心角（θ１））は、少なくとも９０°以上が望ましく、図２に示すように、１２０°以上であれば望ましい。
As shown in FIGS. 1 and 2, the strip-shaped plate material 2 is wound around the transport roll 3 so that the width direction of the plate material 2 is substantially parallel to the axial direction of the transport roll 3. In this way, the plate 2 in contact with the transport roll 3 is transported in the longitudinal direction of the plate 2 by the transport roll 3 that rotates about the axis.
Here, as shown in FIG. 2, the plate 2 is in contact with the transport roll 3 on the outer peripheral surface corresponding to an angle around the axis (center angle (θ 1 )) of about 135 ° in the cross section of the transport roll 3. Yes. At this time, since the vibration of the plate material 2 cannot be prevented simply by the plate material 2 being in contact with the conveyance roll 3 (simply placed), the plate material 2 is sufficiently wound around the conveyance roll 3, and vibration and It needs to be transported stably without swinging. As the amount of winding of the plate material 2 around the transport roll 3 increases, the plate material 2 is more stably transported. Therefore, the angle around the axis corresponding to the range in which the plate material 2 is wound on the outer peripheral surface of the transport roll 3 ( The central angle (θ 1 )) is preferably at least 90 ° or more, and preferably 120 ° or more as shown in FIG.
ここで、搬送ロール３は、巻き掛けられた板材２へ張力を付与することが可能なロールであればよい。具体的には、回転速度を調整することによって巻き掛けられた板材へ張力を付与することが可能なブライドルロール等が、張力を適正な範囲に保持し易く望ましい。
搬送ロール３に巻き掛けられた板材２に高い張力を付与することは、搬送ロール３上において板材２の形状不良部分を平坦化（潜在化ともいえる）させるために重要である。付
与する張力が高いほど形状不良部分を平坦化（潜在化）させる効果は大きいが、板材２の降伏強度を超える過度な張力の付与は板材２の幅引け等を引き起こし、逆に板幅の計測精度に悪影響を及ぼす恐れがある。従って、付与する張力の適正な範囲としては、板材２の降伏強度の約５０％以下の範囲、好ましくは、２０％以上４０％以下の範囲を採用すべきである。
Here, the conveyance roll 3 should just be a roll which can provide tension | tensile_strength to the board | plate material 2 wound around. Specifically, a bridle roll or the like that can apply tension to the wound plate by adjusting the rotation speed is desirable because it can easily maintain the tension in an appropriate range.
Giving high tension to the plate material 2 wound around the transport roll 3 is important for flattening (also referred to as latent) a shape defect portion of the plate material 2 on the transport roll 3. The higher the applied tension, the greater the effect of flattening (latentizing) the defective part, but applying excessive tension exceeding the yield strength of the plate 2 causes the plate 2 to be reduced, and conversely the measurement of the plate width. May adversely affect accuracy. Therefore, as an appropriate range of tension to be applied, a range of about 50% or less, preferably 20% or more and 40% or less of the yield strength of the plate member 2 should be adopted.
図２に戻り、板幅計測装置１のカメラ５ａ，５ｂ及び照明装置４ａ，４ｂは、板材２が搬送ロール３に巻き掛けられて接触している範囲において、板材２に対向する位置に配置されている。
以下、カメラ５ａ，５ｂ及び照明装置４ａ，４ｂの構成を説明する。
カメラ（撮像部）５ａ，５ｂは、ＣＣＤ（Charge-Coupled Device）方式やＣＭＯＳ(Complementary Metal-Oxide Semiconductor)方式などの平面のイメージセンサを用いた一般的なカメラであって、搬送ロール３の表面に照明装置４ａ，４ｂによって形成された板材２の両端の陰影を含む画像を撮像する（撮像工程）ものである。このとき、イメージセンサによって撮像する画像は、カラーであってもモノクロであってもよく、色調は限定されない。
Returning to FIG. 2, the cameras 5 a and 5 b and the lighting devices 4 a and 4 b of the plate width measuring device 1 are arranged at positions facing the plate material 2 in a range where the plate material 2 is wound around and contacted with the transport roll 3. ing.
Hereinafter, the configuration of the cameras 5a and 5b and the illumination devices 4a and 4b will be described.
The cameras (imaging units) 5 a and 5 b are general cameras using a planar image sensor such as a CCD (Charge-Coupled Device) method or a CMOS (Complementary Metal-Oxide Semiconductor) method. In this example, an image including shadows at both ends of the plate 2 formed by the lighting devices 4a and 4b is captured (imaging process). At this time, the image captured by the image sensor may be color or monochrome, and the color tone is not limited.
カメラ５ａ，５ｂは、イメージセンサの中心を通る垂線が搬送ロール３の軸心に対してほぼ垂直に交わる方向を向くように配置される。このとき、イメージセンサの視野には、板材２の幅方向に平行な座標軸Ｘと板材の長手方向に平行な座標軸Ｙが割り当てられ、イメージセンサの各画素は、座標軸Ｘ，Ｙによって表される各座標に対応づけられている。つまり、搬送ロール３に対向する所定の位置にカメラ５ａ，５ｂが固定されると、イメージセンサのある画素は、搬送ロール３の外周面の所定の位置を常に撮像することとなる。 The cameras 5 a and 5 b are arranged so that a perpendicular passing through the center of the image sensor faces a direction that intersects substantially perpendicularly to the axis of the transport roll 3. At this time, a coordinate axis X parallel to the width direction of the plate member 2 and a coordinate axis Y parallel to the longitudinal direction of the plate member 2 are assigned to the field of view of the image sensor, and each pixel of the image sensor is represented by the coordinate axes X and Y. It is associated with coordinates. That is, when the cameras 5 a and 5 b are fixed at a predetermined position facing the conveyance roll 3, a certain pixel of the image sensor always images a predetermined position on the outer peripheral surface of the conveyance roll 3.
このような構成によれば、板材２の端部を撮像した画素を特定することで、板材２の端部の搬送ロール３上での位置を特定することができる。
ここで、設置するカメラ５ａ，５ｂの台数は限定されないので、１台のカメラを１台だけ配置して板材２の全幅を捉えてもよく、また複数台のカメラを板材２の幅方向に沿って配置して、板材２の全幅を分割して視野に収めてもよい。実際には、１台のカメラで板材２の全幅を捉えると、イメージセンサの視野の中央部は、板材２の幅方向の両端である板端部を捉えることが無く無駄な領域となってしまうため、板端部のそれぞれに対応する位置に１台以上のカメラを配置するのが望ましい。
According to such a structure, the position on the conveyance roll 3 of the edge part of the board | plate material 2 can be specified by specifying the pixel which imaged the edge part of the board | plate material 2. FIG.
Here, since the number of cameras 5a and 5b to be installed is not limited, only one camera may be arranged to capture the entire width of the plate member 2, or a plurality of cameras may be arranged along the width direction of the plate member 2. May be arranged so that the entire width of the plate member 2 is divided and placed in the field of view. Actually, if the entire width of the plate material 2 is captured by a single camera, the central portion of the field of view of the image sensor becomes a useless area without capturing the plate end portions that are both ends in the width direction of the plate material 2. Therefore, it is desirable to arrange one or more cameras at positions corresponding to the respective plate edge portions.
図２に示すように、本実施形態では、２台のカメラ５ａ，５ｂを用いて、板材２の幅方向の両端である板端部のそれぞれに対応する位置に１台のカメラを配置している。
なお、カメラ５ａ，５ｂのシャッタースピード、絞り、感度等、及びイメージセンサの撮影条件については、搬送される板材２の速度や、望まれる板幅の検出精度等に応じて調整される。
As shown in FIG. 2, in this embodiment, one camera is arranged at a position corresponding to each of the plate end portions that are both ends in the width direction of the plate member 2 using the two cameras 5a and 5b. Yes.
Note that the shutter speed, aperture, sensitivity, and the like of the cameras 5a and 5b and the imaging conditions of the image sensor are adjusted according to the speed of the transported plate member 2, the desired plate width detection accuracy, and the like.
照明装置（陰影形成部）４ａ，４ｂは、例えば、ハロゲンランプやＬＥＤランプなどを光源とする白色照明であり、搬送ロール３に所定の張力をもって巻き掛けられた板材２に対して照明装置４ａ，４ｂの前方に向かって光を照射し、巻き掛けられた板材２の両端の陰影を形成する（陰影形成工程）ものである。
図３及び図４に示すように、このような２台の照明装置４ａ，４ｂを、搬送ロール３に巻き掛けられた板材２の幅方向における中央側から両端側に向かって光を照射するように配置することで、搬送ロール３上に板材２の両端の陰影を形成することができる。
The illuminating devices (shadow forming portions) 4a and 4b are white illuminations using, for example, a halogen lamp or an LED lamp as a light source, and the illuminating devices 4a, 4b Light is irradiated toward the front of 4b, and the shadow of the both ends of the wound board | plate material 2 is formed (shadow formation process).
As shown in FIGS. 3 and 4, such two illumination devices 4 a and 4 b are irradiated with light from the center side in the width direction of the plate member 2 wound around the transport roll 3 toward both end sides. By disposing them, shadows at both ends of the plate material 2 can be formed on the transport roll 3.
詳しくは、２台のうち一方の照明装置４ａは、一方のカメラ５ａのイメージセンサで視認する板材２の端部を、幅方向における中央側から一方の端部側に向かって該端部の斜め上方から照射される傾斜光線によって照らし、板材２の一方の端部の外側に明瞭な陰影（暗部）を生じさせる。２台のうち他方の照明装置４ｂも、同様の方法で、板材２の他方の端部の外側に明瞭な陰影（暗部）を生じさせる。 Specifically, one of the two lighting devices 4a is configured such that the end portion of the plate member 2 visually recognized by the image sensor of one camera 5a is inclined from the center side to the one end portion side in the width direction. Illuminated by inclined light rays irradiated from above, a clear shadow (dark part) is generated outside one end of the plate 2. Of the two units, the other lighting device 4b also produces a clear shadow (dark part) on the outside of the other end of the plate 2 in the same manner.
図３を参照して、照明装置４ａ，４ｂの向きは、板材２の表面に対して照射される光の光軸が、光軸角（θ２）１５°〜８０°（より望ましくは２０°〜４５°）となるように板材２の上方に配置される。また、図４を参照して、照明装置４ａ，４ｂの向きは、板材２の表面に対する照射される光の光軸が、板材２の長手方向に対してほぼ垂直となってい
る、つまり、板材２の幅方向に沿っているのが望ましい。
Referring to FIG. 3, the illumination devices 4 a and 4 b are oriented such that the optical axis of the light applied to the surface of the plate member 2 is an optical axis angle (θ 2 ) of 15 ° to 80 ° (more preferably 20 °). It is arrange | positioned above the board | plate material 2 so that it may become (-45 degrees). Referring to FIG. 4, the illumination devices 4 a and 4 b are oriented such that the optical axis of the light applied to the surface of the plate 2 is substantially perpendicular to the longitudinal direction of the plate 2. It is desirable to be along the width direction of 2.
２台の照明装置４ａ，４ｂを、図３及び図４に示すように配置することで、板材２の両端の外側に明瞭な陰影（暗部）を生じさせることができる。
ここで、照明装置４ａ，４ｂの台数は２台に限定されないが、複数台の照明が板材２の幅方向に沿って同じ向きに配置されると、板面上での傾斜光線の干渉によって板材２の端部の外側に明瞭な陰影（暗部）が生じ難くなるおそれがある。従って、板材２の両端のそれぞれに向けて１台の照明装置を配置するのが望ましい。
By arranging the two illumination devices 4 a and 4 b as shown in FIGS. 3 and 4, clear shadows (dark parts) can be generated on the outer sides of both ends of the plate member 2.
Here, the number of the illuminating devices 4a and 4b is not limited to two. However, when a plurality of lighting devices are arranged in the same direction along the width direction of the plate member 2, the plate member is caused by interference of inclined light rays on the plate surface. There is a possibility that a clear shadow (dark part) is less likely to be generated on the outside of the end portion of 2. Therefore, it is desirable to arrange one lighting device toward each of both ends of the plate member 2.
以上のように照明装置４ａ，４ｂを配置することで、板材２の両端の表面が明るくなると共に、コントラストのむらが低減し、且つ両端の外側に明瞭な陰影（暗部）が生じる。従って、板材２の両端近傍におけるコントラストの変化量を極めて大きくすることができ、板材２の両端（エッジ）の検出精度が安定化する。言い換えれば、イメージセンサで視認する板材２の端部近傍の色彩ムラが低減されるとともに、板材２の端部の外側に明瞭な陰影（暗部）を作ることで板材２の端部の検出が容易となる。 By arranging the lighting devices 4a and 4b as described above, the surfaces of both ends of the plate 2 are brightened, the unevenness of contrast is reduced, and clear shadows (dark parts) are generated outside the both ends. Therefore, the amount of change in contrast in the vicinity of both ends of the plate material 2 can be greatly increased, and the detection accuracy of both ends (edges) of the plate material 2 is stabilized. In other words, color unevenness in the vicinity of the end of the plate 2 that is visually recognized by the image sensor is reduced, and the end of the plate 2 can be easily detected by creating a clear shadow (dark part) outside the end of the plate 2. It becomes.
ここで、図５を参照し、本実施形態による板幅計測装置１のカメラ５ａ，５ｂが撮像した画像から、板材２の端部の位置を検出する画像処理について説明する。なお、以下に説明する画像処理は、板幅計測装置１の構成要素であって、図示しない画像処理装置によって行われる。
例えば、図５（ａ）は、カメラ５ａで撮像した画像であり、板材５の一方側の端部を示している。画像の板幅方向における左半分の白い領域は板材２の表面であり、板材２の表面の右端、つまり画像の中央付近には、板材２の端部の外側に形成された陰影（暗部）Ｓが黒色で明瞭に撮像されており、さらに陰影Ｓの右側には、搬送ロール３の表面が撮像されている。
Here, with reference to FIG. 5, image processing for detecting the position of the end portion of the plate 2 from the images captured by the cameras 5 a and 5 b of the plate width measuring apparatus 1 according to the present embodiment will be described. The image processing described below is a component of the plate width measuring apparatus 1 and is performed by an image processing apparatus (not shown).
For example, FIG. 5A is an image captured by the camera 5 a and shows an end portion on one side of the plate member 5. The white area in the left half of the image in the plate width direction is the surface of the plate 2, and a shadow (dark portion) S formed outside the end of the plate 2 near the right end of the surface of the plate 2, that is, near the center of the image. Is clearly imaged in black, and on the right side of the shadow S, the surface of the transport roll 3 is imaged.
図５（ａ）の画像において、画像処理装置は、検出線Ｌ１上の輝度値を検出し、板幅方向における輝度値の変化量（例えば、微分値Ｄ）を算出する。図５（ｂ）は、検出線Ｌ１の輝度値の変化量（微分値Ｄ）を示すグラフであり、板材２の表面と板材２の端部の陰影との境界で大きなピークが検出されている。このピークの位置を検出線Ｌ１における板材２の一方の端部の位置とする。つまり、板幅方向の中央側から端部側に向けて、コントラストが明から暗に転じるときのコントラストの変化量が最も大きな位置を板材２の端部（エッジ）として検出する。 In the image of FIG. 5A, the image processing device detects the luminance value on the detection line L1, and calculates the amount of change (for example, the differential value D) of the luminance value in the plate width direction. FIG. 5B is a graph showing the amount of change (differential value D) in the luminance value of the detection line L1, and a large peak is detected at the boundary between the surface of the plate 2 and the shadow of the end of the plate 2. . This peak position is defined as the position of one end of the plate 2 on the detection line L1. That is, the position where the contrast change amount is the largest when the contrast changes from light to dark from the center side to the end side in the plate width direction is detected as the end (edge) of the plate 2.
同様の処理を、板材２の他方側の端部を示す画像において検出線Ｌ１に対応する検出線上の輝度値に対しても施し、板材２の他方の端部の位置も検出する。
板幅計測装置１は、上述のようにカメラ５ａ，５ｂによって撮像された画像中における板材２の両端の陰影の位置を基に、板材２の両端の位置を検出し（端部位置検出工程）、検出した板材２の両端の位置から板材２の板幅を算出する。
Similar processing is performed on the luminance value on the detection line corresponding to the detection line L1 in the image showing the other end of the plate 2 and the position of the other end of the plate 2 is also detected.
The plate width measuring device 1 detects the positions of both ends of the plate material 2 based on the positions of the shadows at both ends of the plate material 2 in the images captured by the cameras 5a and 5b as described above (end position detection step). Then, the plate width of the plate 2 is calculated from the detected positions of both ends of the plate 2.
画像処理装置が実施する画像処理は、周知の一般的な画像処理技術を用いればよい。上述のように画像を構成するドットの輝度値を用いるだけでなく、各ドットの濃度を用いてもよい。望ましくは、上述の検出線Ｌ１上の濃度の絶対値ではなく、図５（ａ）においてエッジ検出領域として示した所定の計測領域内で、板幅方向に対して垂直に投影処理をおこなっても、図５（ｂ）に示すグラフと同様の結果を得ることができる。 The image processing performed by the image processing apparatus may use a known general image processing technique. As described above, not only the luminance value of the dots constituting the image but also the density of each dot may be used. Desirably, even if the projection processing is performed perpendicularly to the plate width direction within the predetermined measurement region shown as the edge detection region in FIG. 5A, not the absolute value of the density on the detection line L1 described above. A result similar to the graph shown in FIG. 5B can be obtained.
このときの平均濃度の変化量を基に平均濃度の変化量が最も大きな位置を板材２の端部（エッジ）として検出すれば、画像全体に照度変化が生じてもその影響を回避することができるため望ましい。
また、一般的に汎用の画像処理装置には画像の前処理機能（フィルタリングによるノイズの除去やエッジ強調処理等）が備わるが、これらの機能を用いると検出するエッジの位置にズレが生じる場合があるため、本実施形態による画像処理装置では使用しないことが望ましい。
If the position where the change amount of the average density is the largest is detected as the end portion (edge) of the plate member 2 based on the change amount of the average density at this time, the influence can be avoided even if the illuminance change occurs in the entire image. This is desirable because it can be done.
In general, general-purpose image processing apparatuses are provided with image preprocessing functions (such as noise removal by filtering and edge enhancement processing). However, when these functions are used, the detected edge position may be misaligned. For this reason, it is desirable not to use the image processing apparatus according to the present embodiment.
なお、イメージセンサで検出した端部の位置は「画像内の幅方向における位置（ドット）」であるため、検出した端部の位置から板幅を算出するには、画像内の幅方向における各ドットの位置を実際の搬送ロール３上の位置（ｍｍ）に換算しなくてはならない。その上で、端部の位置を搬送ロール３上での実際のエッジ位置（ｍｍ）に換算する。そのため
には、イメージセンサを板材２の搬送ラインに設置した後、板幅の計測位置の搬送ロール３上に定規を配置して撮影した画像をもとに、搬送ロール３上の位置（ｍｍ）に対する画像内の幅方向における位置（ドット）の関係式を求めておく。
Since the position of the edge detected by the image sensor is “position in the width direction (dot) in the image”, the plate width can be calculated from the position of the detected edge by using each position in the width direction in the image. The dot position must be converted to the actual position (mm) on the transport roll 3. Then, the position of the end portion is converted into an actual edge position (mm) on the transport roll 3. For that purpose, the position (mm) on the transport roll 3 is set on the basis of the image taken by placing the ruler on the transport roll 3 at the plate width measurement position after installing the image sensor on the transport line of the plate 2. The relational expression of the position (dot) in the width direction in the image is obtained.
板材２の搬送速度に応じて、上述したカメラ５ａ，５ｂによる撮像を、例えば１秒に一回程度行い、各撮像画像に対して上述の画像処理を行うことで、板材２の長手方向に沿った板幅の変動を連続的に計測することができる。
図６を参照して、本実施形態による板幅計測装置１を設ける位置の具体例を説明する。図６は、板幅計測装置１を設ける設備の一例である薄板の製造ライン６を表す模式図である。
According to the conveyance speed of the plate material 2, the above-described imaging by the cameras 5a and 5b is performed about once per second, for example, and the above-described image processing is performed on each captured image, thereby along the longitudinal direction of the plate material 2. It is possible to continuously measure fluctuations in the plate width.
With reference to FIG. 6, the specific example of the position which provides the board width measuring apparatus 1 by this embodiment is demonstrated. FIG. 6 is a schematic diagram showing a thin plate production line 6 which is an example of equipment provided with the plate width measuring apparatus 1.
図６に示す薄板の製造ライン６は、板材２の一例である薄板７を焼鈍する焼鈍工程と、焼鈍された薄板７を酸洗する酸洗工程とを有するラインであり、酸洗された薄板７を巻き取って製品としての薄板コイル８を製造する。
この薄板の製造ラインにおいて、焼鈍工程の入側には入側のブライドルロール９が設けられており、酸洗工程の出側には出側のブライドルロール１０が設けられている。ブライドルロール９，１０は、搬送ロール３の一例であって、主に薄板の製造ラインにおいて薄板７に張力を付与する機能を有するとともに、薄板７の搬送方向を大きく変えるために薄板７の巻き掛け量が多いロールである。ブライドルロール９，１０においては所定の張力をもって薄板７が巻き掛けられており、薄板７の両端をブライドルロール９，１０の表面に密着させることができる。そのため、薄板７に中波や耳波などの形状不良が存在したとしても、ブライドルロール９，１０上で薄板７を平坦化することができ、板幅計測を確実に行えるようになる。なお、所定の張力は薄板７の降伏強度の２０％以上４０％以下とするとよい。
A thin plate production line 6 shown in FIG. 6 is a line having an annealing step for annealing a thin plate 7 as an example of the plate material 2 and a pickling step for pickling the annealed thin plate 7. 7 is wound up to produce a thin coil 8 as a product.
In this thin plate production line, an entry side bridle roll 9 is provided on the entry side of the annealing process, and an exit side bridle roll 10 is provided on the exit side of the pickling process. The bridle rolls 9 and 10 are an example of the transport roll 3 and have a function of applying tension to the thin plate 7 mainly in a thin plate production line, and the thin plate 7 is wound around in order to greatly change the transport direction of the thin plate 7. It is a roll with a large amount. In the bridle rolls 9 and 10, the thin plate 7 is wound with a predetermined tension, and both ends of the thin plate 7 can be brought into close contact with the surface of the bridle rolls 9 and 10. Therefore, even if the thin plate 7 has a shape defect such as a medium wave or an ear wave, the thin plate 7 can be flattened on the bridle rolls 9 and 10, and the plate width can be measured reliably. The predetermined tension may be 20% or more and 40% or less of the yield strength of the thin plate 7.
以下、図７及び図８を参照しながら、本実施形態による板幅計測装置１の計測結果、及び比較例による板幅計測装置１１の計測結果について説明する。
図７は、比較例による板幅計測装置１１の構成を示す図であり、搬送ロール１３には、板材１２がほとんど巻き掛けられていない。また、比較例による板幅計測装置１１の照明装置１４は直管蛍光灯型のＬＥＤ照明灯である。比較例による板幅計測装置１１の照明装置１５ａ，１５ｂは、ほぼ平板の板材１２に対して、板材１２の表面に対してほぼ垂直の方向から、板材１２の幅方向に沿ってほぼ均等に光を照射しており、本実施形態による板幅計測装置１の照明装置５ａ，５ｂのように、傾斜光線による照明を当てるものではない。
Hereinafter, the measurement result of the plate width measuring apparatus 1 according to the present embodiment and the measurement result of the plate width measuring apparatus 11 according to the comparative example will be described with reference to FIGS. 7 and 8.
FIG. 7 is a diagram illustrating a configuration of a plate width measuring device 11 according to a comparative example, and the plate material 12 is hardly wound around the transport roll 13. Moreover, the illuminating device 14 of the plate width measuring device 11 according to the comparative example is a straight tube fluorescent lamp type LED illuminating lamp. The lighting devices 15a and 15b of the plate width measuring device 11 according to the comparative example emit light substantially uniformly along the width direction of the plate 12 from a direction substantially perpendicular to the surface of the plate 12 with respect to the substantially flat plate 12. As in the illumination devices 5a and 5b of the plate width measuring device 1 according to the present embodiment, illumination by inclined light rays is not applied.
図８に示すグラフは、横軸を計測時間（秒）、縦軸を計測された板幅（ｍｍ）としており、図８（ａ）は、図７の板幅計測装置１１、すなわち比較例による板幅計測装置１１の計測結果を示し、図８（ｂ）は、本実施形態による板幅計測装置１の計測結果を示している。図８に示す計測結果は、長手方向に沿って連続的に搬送される板材２又は板材１２に対して定点で計測した結果であるので、横軸の計測時間（秒）を板材２又は板材１２の長手方向における位置に置き換えて見ることができる。従って、図８は、板材２又は板材１２の長手方向に沿った板幅の変動を示すものである。 In the graph shown in FIG. 8, the horizontal axis is the measurement time (seconds), and the vertical axis is the measured plate width (mm). FIG. 8A is based on the plate width measuring device 11 of FIG. 7, that is, the comparative example. The measurement result of the board width measuring device 11 is shown, and FIG. 8B shows the measurement result of the board width measuring device 1 according to the present embodiment. The measurement result shown in FIG. 8 is a result of measurement at a fixed point with respect to the plate material 2 or the plate material 12 continuously conveyed along the longitudinal direction. Therefore, the measurement time (second) on the horizontal axis is set to the plate material 2 or the plate material 12. It can be seen by replacing the position in the longitudinal direction. Therefore, FIG. 8 shows the fluctuation | variation of the board width along the longitudinal direction of the board | plate material 2 or the board | plate material 12. FIG.
図８（ａ）に示すように、比較例による板幅計測装置１１では、計測された板幅の値に連続性がほとんどなく、板幅の変動を把握することができない。つまり、比較例による板幅計測装置１１では、板材１２の端部が安定して検出できておらず、実際の端部ではない部分の位置を端部の位置として検出してしまったエラーに基づく板幅が多く含まれていると考えられる。 As shown in FIG. 8A, in the board width measuring device 11 according to the comparative example, the measured board width value has little continuity, and fluctuations in the board width cannot be grasped. That is, the plate width measuring device 11 according to the comparative example is based on an error in which the end portion of the plate 12 is not stably detected and the position of the portion that is not the actual end portion is detected as the end portion position. It is thought that a lot of board width is included.
これに対して、図８（ｂ）に示すように、本実施形態による板幅計測装置１では、連続的に板幅の値が計測されている。つまり、板材２の端部が安定して検出できており、正確に検出された端部の位置に基づく板幅が得られていると考えられる。
この比較が示すように、本実施形態による板幅計測装置１を用いることで、板材２の振動（パスライン変動）を抑制できるとともに、板材２の耳波といった形状不良を平坦化（潜在化）し、板形状の影響を受けることなく正確に板幅を計測できる。また、板材２の表面と搬送ロール３の表面の色彩が近い場合や、各々の表面に色彩ムラがある場合に、板端
部の視認に必要なコントラストを安定して得難くなるが、上述の照明装置５ａ，５ｂを設けることで板材２の端部の視認に必要なコントラストを安定して得ることができ、安定して板幅を計測できる。
On the other hand, as shown in FIG. 8B, the plate width measuring apparatus 1 according to the present embodiment continuously measures the value of the plate width. That is, it is considered that the end portion of the plate member 2 can be detected stably, and the plate width based on the position of the accurately detected end portion is obtained.
As this comparison shows, by using the plate width measuring device 1 according to the present embodiment, vibration (pass line fluctuation) of the plate material 2 can be suppressed, and shape defects such as ear waves of the plate material 2 are flattened (latentized). In addition, the plate width can be accurately measured without being affected by the plate shape. In addition, when the color of the surface of the plate 2 and the surface of the transport roll 3 are close, or when there is color unevenness on each surface, it is difficult to stably obtain the contrast necessary for visually recognizing the plate edge, By providing the illuminating devices 5a and 5b, the contrast necessary for visually recognizing the end of the plate member 2 can be obtained stably, and the plate width can be measured stably.
さらに、本実施形態による板幅計測装置１を、主に薄板の製造ライン６に備わる張力付与ロールの位置に設ければ、汎用のイメージセンサ、照明装置、及び画像処理装置のみで容易に且つ精度良く板幅を計測することができる。
なお、今回開示された実施形態はすべての点で例示であって制限的なものではないと考えられるべきである。特に、今回開示された実施形態において、明示的に開示されていない事項、例えば、運転条件や操業条件、各種パラメータ、構成物の寸法、重量、体積などは、当業者が通常実施する範囲を逸脱するものではなく、通常の当業者であれば、容易に想定することが可能な値を採用している。
Furthermore, if the plate width measuring device 1 according to the present embodiment is provided mainly at the position of the tension applying roll provided in the thin plate production line 6, it is easy and accurate only with a general-purpose image sensor, illumination device, and image processing device. The board width can be measured well.
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. In particular, in the embodiment disclosed this time, matters that are not explicitly disclosed, for example, operating conditions and operating conditions, various parameters, dimensions, weights, volumes, and the like of a component deviate from a range that a person skilled in the art normally performs. Instead, values that can be easily assumed by those skilled in the art are employed.
１，１１ 板幅計測装置
２，１２ 板材（薄板）
３，１３ 搬送ロール
４ａ，４ｂ，１４ 照明装置
５ａ，５ｂ，１５ａ，１５ｂ カメラ
６ 薄板の製造ライン
７ 薄板
８ 薄板コイル８
９，１０ ブライドルロール
Ｓ 陰影（暗部）
1,11 Plate width measuring device 2,12 Plate material (thin plate)
3, 13 Transport rolls 4a, 4b, 14 Illumination devices 5a, 5b, 15a, 15b Camera 6 Thin plate production line 7 Thin plate 8 Thin plate coil 8
9,10 Bridle roll S Shadow (dark part)
Claims (6)
前記搬送ロールに所定の張力をもって巻き掛けられた薄板の両端の陰影を形成する陰影形成工程と、
前記陰影形成工程によって形成された前記薄板の両端の陰影を含む画像を撮像する撮像工程と、
前記撮像工程によって撮像された画像中における前記両端の陰影の位置を基に、前記薄板の両端の位置を検出する端部位置検出工程と、
を備えることを特徴とする板幅計測方法。 It is a plate width measuring method for detecting the positions of both ends in the width direction of a thin plate that is wound around and conveyed by a transport roll, and measuring the plate width of the thin plate based on the detected positions of both ends,
A shadow forming step for forming shadows at both ends of the thin plate wound around the transport roll with a predetermined tension;
An imaging step of capturing an image including shadows at both ends of the thin plate formed by the shadow forming step;
An end position detecting step for detecting the positions of both ends of the thin plate based on the positions of the shadows of the both ends in the image captured by the imaging step;
A board width measuring method comprising:
前記搬送ロールに所定の張力をもって巻き掛けられた薄板の両端の陰影を形成する陰影形成部と、
前記陰影形成手段によって形成された前記薄板の両端の陰影を含む画像を撮像する撮像部と、
前記撮像部によって撮像された画像中における前記両端の陰影の位置を基に、前記薄板の両端の位置を検出する端部位置検出部と、
を備えることを特徴とする板幅計測装置。 A plate width measuring device that detects positions of both ends in the width direction of the thin plate that is wound around and conveyed by a transport roll, and measures the plate width of the thin plate based on the detected positions of both ends,
A shadow forming section for forming shadows at both ends of the thin plate wound around the transport roll with a predetermined tension;
An imaging unit that captures an image including shadows at both ends of the thin plate formed by the shadow forming means;
An end position detection unit that detects positions of both ends of the thin plate based on the positions of the shadows of the both ends in the image captured by the imaging unit;
A board width measuring device comprising:
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| JPH0666523A (en) * | 1992-08-18 | 1994-03-08 | Yoshikawa Kogyo Co Ltd | Measuring method for dimension of plate |
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| JP2010032432A (en) * | 2008-07-30 | 2010-02-12 | Jfe Steel Corp | Method and device for measuring plate width of steel plate |
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| JPH03279802A (en) * | 1990-03-29 | 1991-12-11 | Nippon Steel Corp | Dimension measuring method for steel plate |
| JPH0666523A (en) * | 1992-08-18 | 1994-03-08 | Yoshikawa Kogyo Co Ltd | Measuring method for dimension of plate |
| JP2000161933A (en) * | 1998-11-30 | 2000-06-16 | Kawasaki Steel Corp | Edge detector for steel plate |
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