JP6256365B2 - Method and equipment for measuring flat shape of steel strip - Google Patents

Method and equipment for measuring flat shape of steel strip Download PDF

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JP6256365B2
JP6256365B2 JP2015019952A JP2015019952A JP6256365B2 JP 6256365 B2 JP6256365 B2 JP 6256365B2 JP 2015019952 A JP2015019952 A JP 2015019952A JP 2015019952 A JP2015019952 A JP 2015019952A JP 6256365 B2 JP6256365 B2 JP 6256365B2
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steel strip
position data
height position
flat shape
surface height
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JP2016140898A (en
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竜也 林
竜也 林
康之 馬場
康之 馬場
沖　祐一郎
祐一郎 沖
豪巨 深江
豪巨 深江
真行 加藤
真行 加藤
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JFE Steel Corp
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Description

本発明は、鋼帯の平坦形状（耳波、中伸び等）を測定する平坦形状測定方法及び平坦形状測定設備に関するものである。   The present invention relates to a flat shape measuring method and flat shape measuring equipment for measuring a flat shape (ear wave, middle elongation, etc.) of a steel strip.

鋼帯の平坦形状（耳波、中伸び等）の一般的な測定方法として、冷間圧延機の出側やスキンパスミルの出側やテンションレベラーの出側に、張力差測定原理に基づく形状検出器を設置し、冷間圧延機やスキンパスミルやテンションレベラーで圧下後の鋼帯の平坦形状（耳波、中伸び等）の度合（平坦度、急峻度）を測定する方法が知られている。   As a general method for measuring the flat shape of steel strips (ear waves, medium elongation, etc.), shape detection based on the principle of tension difference measurement is used on the exit side of a cold rolling mill, the exit side of a skin pass mill, and the exit side of a tension leveler. A method to measure the flatness (flatness, steepness) of the flat shape (ear wave, medium elongation, etc.) of the steel strip after being rolled by a cold rolling mill, skin pass mill or tension leveler is known. .

しかし、スキンパスミルの出側やテンションレベラーの出側に張力差測定原理に基づく形状検出器を設置した場合、スキンパスミルやテンションレベラーは軽圧下率であるため、鋼帯の幅方向断面プロフィールにおいてエッジドロップがある場合は、エッジ部に圧下がかからず、スキンパスミルやテンションレベラーの前後での張力の縁切りができない。この状態で平坦度を測定した場合、エッジ部が入側の平坦形状を取り込んでしまうため、平坦度を正確に測定したことにはならず、平坦度の測定値に対する保証ができない。   However, when a shape detector based on the principle of tension difference measurement is installed on the exit side of the skin pass mill or on the exit side of the tension leveler, the skin pass mill or tension leveler has a light reduction rate, so the edge in the cross-sectional profile in the width direction of the steel strip When there is a drop, the edge is not squeezed and the edge of the tension before and after the skin pass mill or tension leveler cannot be cut. When the flatness is measured in this state, since the edge portion takes in the flat shape on the entry side, the flatness is not accurately measured, and the flatness measurement value cannot be guaranteed.

この対策として、例えば特許文献１に記載の方法が開発されている。   As a countermeasure, for example, a method described in Patent Document 1 has been developed.

すなわち、特許文献１では、ペイオフリールとスキンパスミルとテンションリールとからなる鋼帯圧延ラインにおいて、スキンパスミルとテンションリールの間に、ミル入側張力縁切り用ブライドルロールとテンションリール張力縁切り用ブライドルロールを設け、ミル入側張力縁切り用ブライドルロールとテンションリール張力縁切り用ブライドルロールの間に、張力差測定原理に基づく形状検出器を配置し、入側張力と出側張力の影響を排除した状態での鋼帯の張力分布から鋼帯の平坦度（急峻度）を検出するようにしている。   That is, in Patent Document 1, in a steel strip rolling line composed of a payoff reel, a skin pass mill, and a tension reel, a mill entry side tension edge cutting bridle roll and a tension reel tension edge cutting bridle roll are provided between the skin pass mill and the tension reel. A shape detector based on the tension difference measurement principle is installed between the mill entry side tension edge cutting bridle roll and the tension reel tension edge cutting bridle roll, and the influence of the entry side tension and the exit side tension is eliminated. The flatness (steepness) of the steel strip is detected from the tension distribution of the steel strip.

特開平１−２１９５０７号公報JP-A-1-219507

しかしながら、特許文献１に記載の方法では、鋼帯の張力分布を平坦度（急峻度）に換算するので、例えば鋼帯のエッジ部付近の耳波形状に起因する無張力部分については、平坦度（急峻度）の正確な測定が困難である。また、張力が付加された状態では検出できないような細かい平坦形状の測定も困難である。   However, in the method described in Patent Document 1, since the tension distribution of the steel strip is converted into flatness (steepness), the flatness of, for example, a non-tensile portion caused by an ear wave shape near the edge portion of the steel strip. Accurate measurement of (steepness) is difficult. It is also difficult to measure a fine flat shape that cannot be detected in a state where tension is applied.

本発明は、上記のような事情に鑑みてなされたものであり、鋼帯の製造ラインにおいて、鋼帯の平坦形状（耳波、中伸び等）の度合（平坦度、急峻度）を精度よく測定することができる鋼帯の平坦形状測定方法及び測定設備を提供することを目的とするものである。   The present invention has been made in view of the circumstances as described above, and in the steel strip production line, the degree of flatness (flatness, steepness) of the flat shape (ear wave, medium elongation, etc.) of the steel strip is accurately determined. An object of the present invention is to provide a flat shape measuring method and measuring equipment of a steel strip that can be measured.

上記課題を解決するために、本発明は以下の特徴を有している。   In order to solve the above problems, the present invention has the following features.

［１］鋼帯の製造ラインにおいて、鋼帯の平坦形状を測定する方法であって、鋼帯が無張力状態となった区間で、鋼帯表面にラインレーザー光を照射し、鋼帯表面のラインレーザー光の照射線上での鋼帯表面高さ位置データをカメラにより採取し、採取した鋼帯表面高さ位置データに基づいて、鋼帯の平坦度を算出することを特徴とする鋼帯の平坦形状測定方法。   [1] A method for measuring the flat shape of a steel strip in a production line of the steel strip, wherein the surface of the steel strip is irradiated with a line laser beam in a section where the steel strip is in a tension-free state. The steel strip surface height position data on the irradiation line of the line laser light is collected by a camera, and the flatness of the steel strip is calculated based on the collected steel strip surface height position data. Flat shape measurement method.

［２］鋼帯表面のラインレーザー光の照射線を多点分解し、多点分解した各点で鋼帯表面高さ位置データを連続的に採取し、採取した鋼帯表面高さ位置データを鋼帯上下移動成分と鋼帯平坦形状成分とに分離し、鋼帯平坦形状成分によって鋼帯の平坦度を算出することを特徴とする前記［１］に記載の鋼帯の平坦形状測定方法。   [2] Line laser beam irradiation on the surface of the steel strip is decomposed at multiple points, and the steel strip surface height position data is continuously collected at each of the multi-point resolved points. The steel strip flat shape measuring method according to [1], wherein the steel strip flat shape component is separated into a steel strip vertical movement component and the steel strip flat shape component is calculated from the steel strip flat shape component.

［３］鋼帯の製造ラインにおいて、鋼帯の平坦形状を測定する設備であって、鋼帯が無張力状態となった区間で、鋼帯表面にラインレーザー光を照射するラインレーザー光照射装置と、鋼帯表面のラインレーザー光の照射線上での鋼帯表面高さ位置データを採取するカメラと、採取した鋼帯表面高さ位置データに基づいて、鋼帯の平坦度を算出する演算処理装置を備えていることを特徴とする鋼帯の平坦形状測定設備。   [3] A line laser beam irradiation device for measuring the flat shape of a steel strip in a steel strip production line and irradiating the surface of the steel strip with a line laser beam in a section where the steel strip is in a tension-free state And a camera that collects the steel strip surface height position data on the line laser beam irradiation line on the steel strip surface, and a calculation process that calculates the flatness of the steel strip based on the collected steel strip surface height position data A flat shape measuring facility for a steel strip, characterized by comprising an apparatus.

［４］前記カメラは、鋼帯表面のラインレーザー光の照射線を多点分解して、多点分解した各点で鋼帯表面高さ位置データを連続的に採取し、前記演算処理装置は、前記カメラが採取した鋼帯表面高さ位置データを鋼帯上下移動成分と鋼帯平坦形状成分とに分離して、鋼帯平坦形状成分によって鋼帯の平坦度を算出することを特徴とする前記［３］に記載の鋼帯の平坦形状測定設備。   [4] The camera performs multi-point decomposition of the line laser beam irradiation line on the steel strip surface, continuously collects steel strip surface height position data at each of the multi-point resolved points, The steel strip surface height position data collected by the camera is separated into a steel strip vertical movement component and a steel strip flat shape component, and the flatness of the steel strip is calculated from the steel strip flat shape component. The flat shape measuring equipment for a steel strip according to the above [3].

本発明によれば、鋼帯の製造ラインにおいて、鋼帯の平坦形状（耳波、中伸び等）を測定するに際して、無張力状態となった鋼帯の平坦形状を測定するようにしているので、鋼帯の平坦形状の度合（平坦度、急峻度）を精度よく測定することができる。   According to the present invention, when measuring the flat shape of the steel strip (such as ear waves and medium elongation) in the production line of the steel strip, the flat shape of the steel strip that has become tensionless is measured. The degree of flat shape of the steel strip (flatness, steepness) can be measured with high accuracy.

本発明の実施形態１を示す図である。It is a figure which shows Embodiment 1 of this invention. 本発明の実施形態２を示す図である。It is a figure which shows Embodiment 2 of this invention.

本発明の実施形態を図面に基づいて説明する。   Embodiments of the present invention will be described with reference to the drawings.

［実施形態１］
図１は、本発明の実施形態１を示す図であり、図１（ａ）は斜視図、図２（ｂ）は側面図である。 [Embodiment 1]
1A and 1B are diagrams showing Embodiment 1 of the present invention, in which FIG. 1A is a perspective view and FIG. 2B is a side view.

この実施形態１は、鋼帯の調質圧延ラインにおいて、鋼帯が無張力状態となった区間で、鋼帯の平坦形状（耳波、中伸び等）の度合（平坦度、急峻度）を光学的に測定するものである。   In Embodiment 1 of the temper rolling line of the steel strip, the degree (flatness, steepness) of the flat shape (ear wave, middle elongation, etc.) of the steel strip in the section where the steel strip is in a tensionless state. Optically measured.

すなわち、図１に示すように、この実施形態１においては、鋼帯の調質圧延ラインで、テーブルローラ２上を走行する鋼帯１が無張力状態になった区間に平坦形状測定領域９を設定し、この平坦形状測定領域９に、架台１９で支持された平坦形状測定装置本体１１を鋼帯１の上方に設置している。   That is, as shown in FIG. 1, in this Embodiment 1, in the temper rolling line of the steel strip, the flat shape measurement region 9 is provided in a section where the steel strip 1 running on the table roller 2 is in a tensionless state. The flat shape measuring device body 11 supported by the gantry 19 is set above the steel strip 1 in the flat shape measuring region 9.

そして、この平坦形状測定装置本体１１は、鋼帯１の表面に対して幅方向にラインレーザー光１２を照射するラインレーザー光照射装置１１ａと、鋼帯１表面のラインレーザー光１２の照射線１３上での鋼帯１表面の高さ位置データ（鋼帯表面高さ位置データ）を採取するカメラ１１ｂを備えている。また、平坦形状測定装置本体１１に接続していて、カメラ１１ｂが採取した鋼帯表面高さ位置データに基づいて、鋼帯１の平坦度を算出する演算処理装置（図示せず）が設けられている。   And this flat shape measuring apparatus main body 11 has the line laser beam irradiation apparatus 11a which irradiates the line laser beam 12 to the width direction with respect to the surface of the steel strip 1, and the irradiation line 13 of the line laser beam 12 on the steel strip 1 surface. The camera 11b which collects the height position data (steel band surface height position data) of the steel strip 1 surface above is provided. Further, an arithmetic processing device (not shown) that is connected to the flat shape measuring device main body 11 and calculates the flatness of the steel strip 1 based on the steel strip surface height position data collected by the camera 11b is provided. ing.

なお、鋼帯表面高さ位置データについては、例えば、テーブルローラ２の上端を高さ位置の基準とすればよい。   For the steel strip surface height position data, for example, the upper end of the table roller 2 may be used as a reference for the height position.

これによって、この実施形態１においては、無張力状態の鋼帯１の表面に対して幅方向にラインレーザー光照射装置１１ａからラインレーザー光１２を照射し、鋼帯１表面のラインレーザー光１２の照射線１３上での鋼帯表面高さ位置データをカメラ１１ｂによって採取し、採取した鋼帯表面高さ位置データに基づいて、演算処理装置が鋼帯１の全長にわたって平坦度を算出するようになっている。   Thereby, in this Embodiment 1, the line laser beam 12 is irradiated from the line laser beam irradiation device 11a in the width direction on the surface of the steel strip 1 in a tensionless state, and the line laser beam 12 on the surface of the steel strip 1 is irradiated. The steel strip surface height position data on the irradiation line 13 is collected by the camera 11b, and the arithmetic processing unit calculates the flatness over the entire length of the steel strip 1 based on the collected steel strip surface height position data. It has become.

その際に、カメラ１１ｂは、鋼帯１表面のラインレーザー光１２の照射線１３を多点分解して、多点分解した各点で鋼帯表面高さ位置データを鋼帯１の長手方向に連続的に採取し、演算処理装置は、カメラ１１ｂが採取した鋼帯表面高さ位置データを鋼帯上下移動成分と鋼帯平坦形状成分とに分離して、鋼帯平坦形状成分によって鋼帯１の平坦度を算出することが好ましい。   At that time, the camera 11b multi-decomposes the irradiation line 13 of the line laser beam 12 on the surface of the steel strip 1 and sets the steel strip surface height position data in the longitudinal direction of the steel strip 1 at each of the multi-point resolved points. The processing unit continuously collects the steel strip surface height position data collected by the camera 11b into the steel strip vertical movement component and the steel strip flat shape component, and the steel strip 1 by the steel strip flat shape component. It is preferable to calculate the flatness.

ここで、鋼帯上下移動成分は、鋼帯１全体が上下方向に移動したことによって生じる高さ位置データであり、鋼帯平坦形状成分は、鋼帯１の平坦形状（耳波、中伸び等）によって生じる高さ位置データである。   Here, the steel strip vertical movement component is height position data generated by moving the entire steel strip 1 in the vertical direction, and the steel strip flat shape component is the flat shape of the steel strip 1 (ear waves, middle elongation, etc.). ) Is the height position data generated by.

具体的には、多点分解した各点の鋼帯表面高さ位置データを周波数解析し、各点で同一の周波数の振動成分を鋼帯上下移動成分として、ローパスフィルタ処理によって鋼帯表面高さ位置データから除去し、鋼帯上下移動成分を除去した後の鋼帯表面高さ位置データを鋼帯平坦形状成分とする。   Specifically, the steel strip surface height position data of each point that has been subjected to multi-point decomposition is frequency-analyzed, and the vibration component of the same frequency at each point is used as the steel strip vertical movement component, and the steel strip surface height is measured by low-pass filtering. The steel strip surface height position data after removing the steel strip vertical movement component from the position data is defined as the steel strip flat shape component.

ちなみに、上記のように、多点連続測定を行うことによって、鋼帯表面高さ位置データを鋼帯上下移動成分と鋼帯平坦形状成分とに精度よく分解することができ、平坦度の一層正確な算出が可能になる。   By the way, by performing multi-point continuous measurement as described above, the steel strip surface height position data can be accurately decomposed into the steel strip vertical movement component and the steel strip flat shape component, and the flatness is more accurate. Calculation becomes possible.

もちろん、調質圧延ライン内で鋼帯の上下移動を生じさせる設備（例えば、トリミング装置）から離れた位置で測定することができれば、鋼帯上下移動成分が抑えられるので、より一層好ましい。   Of course, if it can be measured at a position away from equipment (for example, a trimming device) that causes the steel strip to move up and down in the temper rolling line, the steel strip vertical movement component can be suppressed, which is even more preferable.

このようにして、この実施形態１においては、鋼帯の調質圧延ラインにおいて、無張力状態となった鋼帯１の平坦形状（耳波、中伸び等）を測定するようにしているので、鋼帯の平坦形状の度合（平坦度、急峻度）を精度よく測定することができる。   Thus, in this Embodiment 1, in the temper rolling line of the steel strip, since the flat shape (ear wave, middle elongation, etc.) of the steel strip 1 in a tensionless state is measured, The degree of flat shape (flatness, steepness) of the steel strip can be accurately measured.

［実施形態２］
図２は、本発明の実施形態２を示す斜視図である。 [Embodiment 2]
FIG. 2 is a perspective view showing Embodiment 2 of the present invention.

図２に示すように、本発明の実施形態２の基本的な構成は、図１に示した本発明の実施形態１と同じである。   As shown in FIG. 2, the basic configuration of the second embodiment of the present invention is the same as that of the first embodiment of the present invention shown in FIG.

その上で、この実施形態２においては、別途、鋼帯１の表面に対して長手方向にラインレーザー光１６を照射するラインレーザー光照射装置１５ａと、鋼帯１表面のラインレーザー光１６の照射線１７上での鋼帯１表面の高さ位置データ（鋼帯表面高さ位置データ）を採取するカメラ１５ｂを備えた平坦形状測定装置本体１５が設置されている。   In addition, in the second embodiment, separately, a line laser beam irradiation device 15a for irradiating the surface of the steel strip 1 with the line laser beam 16 in the longitudinal direction and the irradiation of the line laser beam 16 on the surface of the steel strip 1 are performed. A flat shape measuring apparatus main body 15 having a camera 15b for collecting the height position data (steel band surface height position data) of the surface of the steel strip 1 on the line 17 is installed.

なお、図２では、簡略化して、鋼帯１幅方向の一方にのみ平坦形状測定装置本体１１を記載しているが、基本的には、平坦形状測定装置本体１５を挟んで、鋼帯１幅方向の他方にも平坦形状測定装置本体１１を設置する。   In FIG. 2, the flat shape measuring device main body 11 is illustrated only in one width direction of the steel strip 1 in a simplified manner, but basically, the steel strip 1 is sandwiched between the flat shape measuring device main body 15. The flat shape measuring device main body 11 is also installed on the other side in the width direction.

このように、鋼帯表面高さ位置データの採取を鋼帯１の幅方向と長手方向の２方向で行って、それぞれの鋼帯表面高さ位置データを付き合わせることにより、鋼帯表面高さ位置データを鋼帯上下移動成分と鋼帯平坦形状成分とにより詳細に分解することができるようになる。   Thus, the steel strip surface height position data is collected in two directions, ie, the width direction and the longitudinal direction of the steel strip 1, and the steel strip surface height position data is associated with each other. The position data can be decomposed in detail by the steel strip vertical movement component and the steel strip flat shape component.

このようにして、この実施形態２においても、鋼帯の調質圧延ラインにおいて、無張力状態となった鋼帯１の平坦形状（耳波、中伸び等）を測定するようにしているので、鋼帯の平坦形状の度合（平坦度、急峻度）を精度よく測定することができる。   Thus, in this second embodiment as well, in the temper rolling line of the steel strip, the flat shape (ear wave, middle elongation, etc.) of the steel strip 1 in a tensionless state is measured. The degree of flat shape (flatness, steepness) of the steel strip can be accurately measured.

なお、上記の実施形態１、２においては、鋼帯の調質圧延ラインを対象にして述べたが、本発明は、他の鋼帯製造ラインにも適用することができる。   In the first and second embodiments, the temper rolling line of the steel strip has been described, but the present invention can also be applied to other steel strip production lines.

本発明の実施例（本発明例）として、上記の本発明の実施形態１に基づいて、鋼帯の調質圧延ラインにおいて、調質ミル（スキンパスミル）で圧延された鋼帯の平坦形状を測定した。   As an example of the present invention (example of the present invention), the flat shape of a steel strip rolled by a temper mill (skin pass mill) in the temper rolling line of the steel strip based on the first embodiment of the present invention described above. It was measured.

測定対象の鋼帯は、板厚が６．５ｍｍ以下、板幅が２２００ｍｍ以下の鋼帯とした。   The steel strip to be measured was a steel strip having a plate thickness of 6.5 mm or less and a plate width of 2200 mm or less.

その結果、従来、上記の特許文献１に記載の方法では、測定誤差が大きくて、信頼できる測定結果が得られなかったのに対して、本発明例では、急峻度として±０．２％内の誤差で平坦度を精度よく測定することができた。   As a result, the conventional method disclosed in Patent Document 1 has a large measurement error and a reliable measurement result cannot be obtained. In the present invention example, the steepness is within ± 0.2%. The flatness could be measured with high accuracy.

１ 鋼帯
２ テーブルローラ
９ 平坦形状測定領域
１１ 平坦形状測定装置本体
１１ａ ラインレーザー光照射装置
１１ｂ カメラ
１２ ラインレーザー光
１３ 照射線
１５ 平坦形状測定装置本体
１５ａ ラインレーザー光照射装置
１５ｂ カメラ
１６ ラインレーザー光
１７ 照射線
１９ 架台 DESCRIPTION OF SYMBOLS 1 Steel strip 2 Table roller 9 Flat shape measurement area | region 11 Flat shape measurement apparatus main body 11a Line laser beam irradiation apparatus 11b Camera 12 Line laser beam 13 Irradiation line 15 Flat shape measurement apparatus main body 15a Line laser beam irradiation apparatus 15b Camera 16 Line laser beam 17 Irradiation beam 19 Mounting base

Claims (2)

鋼帯の製造ラインにおいて、鋼帯の平坦形状を測定する方法であって、鋼帯が無張力状態となった区間で、鋼帯表面にラインレーザー光を照射し、鋼帯表面のラインレーザー光の照射線上での鋼帯表面高さ位置データをカメラにより採取し、採取した鋼帯表面高さ位置データに基づいて、鋼帯の平坦度を算出するものであり、
鋼帯の幅方向と長手方向の２方向で、鋼帯表面にラインレーザー光を照射し、鋼帯表面のそれぞれのラインレーザー光の照射線を多点分解し、多点分解した各点で鋼帯表面高さ位置データを連続的に採取し、採取した鋼帯表面高さ位置データを周波数解析し、各点で同一の周波数の振動成分を鋼帯上下移動成分として、ローパスフィルタ処理によって鋼帯表面高さ位置データから除去し、鋼帯上下移動成分を除去した後の鋼帯表面高さ位置データを鋼帯平坦形状成分として、この鋼帯平坦形状成分によって鋼帯の平坦度を算出することを特徴とする鋼帯の平坦形状測定方法。 A method for measuring the flat shape of a steel strip in a steel strip production line. In the section where the steel strip is in a tensionless state, the surface of the steel strip is irradiated with a line laser beam, and the line laser beam on the surface of the steel strip is irradiated. The steel strip surface height position data on the irradiation line is collected by a camera, and based on the collected steel strip surface height position data, the flatness of the steel strip is calculated .
The steel strip surface is irradiated with line laser light in two directions, the width direction and the longitudinal direction of the steel strip, and each line laser light irradiation line on the steel strip surface is multi-point decomposed, and the steel is produced at each point after multi-point decomposition. Band surface height position data is continuously collected, and the steel strip surface height position data is subjected to frequency analysis. The flatness of the steel strip is calculated from the steel strip flat shape component using the steel strip surface height position data after removing the steel strip vertical movement component from the surface height position data and removing the steel strip vertical movement component. A method for measuring the flat shape of a steel strip characterized by the following. 鋼帯の製造ラインにおいて、鋼帯の平坦形状を測定する設備であって、鋼帯が無張力状態となった区間で、鋼帯表面にラインレーザー光を照射するラインレーザー光照射装置と、鋼帯表面のラインレーザー光の照射線上での鋼帯表面高さ位置データを採取するカメラと、採取した鋼帯表面高さ位置データに基づいて、鋼帯の平坦度を算出する演算処理装置を備えているものであり、
前記ラインレーザー光照射装置は、鋼帯の幅方向と長手方向の２方向で、鋼帯表面にラインレーザー光を照射し、前記カメラは、鋼帯表面のそれぞれのラインレーザー光の照射線を多点分解して、多点分解した各点で鋼帯表面高さ位置データを連続的に採取し、前記演算処理装置は、前記カメラが採取した鋼帯表面高さ位置データを周波数解析し、各点で同一の周波数の振動成分を鋼帯上下移動成分として、ローパスフィルタ処理によって鋼帯表面高さ位置データから除去し、鋼帯上下移動成分を除去した後の鋼帯表面高さ位置データを鋼帯平坦形状成分として、この鋼帯平坦形状成分によって鋼帯の平坦度を算出することを特徴とする鋼帯の平坦形状測定設備。 In a steel strip production line, equipment for measuring the flat shape of a steel strip, a line laser light irradiation device for irradiating the surface of the steel strip with a line laser beam in a section where the steel strip is in a tensionless state, and steel Equipped with a camera that collects steel strip surface height position data on the surface of the belt surface line laser light, and an arithmetic processing unit that calculates the flatness of the steel strip based on the collected steel strip surface height position data It is what
The line laser light irradiation device irradiates the surface of the steel strip with line laser light in two directions, the width direction and the longitudinal direction of the steel strip, and the camera multiplies each line laser light irradiation line on the surface of the steel strip. It is point-resolved, and steel strip surface height position data is continuously collected at each point subjected to multi-point decomposition, and the arithmetic processing unit performs frequency analysis on the steel strip surface height position data collected by the camera , The vibration component of the same frequency at the point is removed from the steel strip surface height position data by low-pass filter processing as the steel strip vertical movement component, and the steel strip surface height position data after removing the steel strip vertical movement component is converted to steel. A flat shape measuring facility for a steel strip, characterized in that the flatness of the steel strip is calculated from the flat strip shape component as a flat strip shape component.
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