JPS619914A

JPS619914A - Method for controlling crown in sheet rolling

Info

Publication number: JPS619914A
Application number: JP59128904A
Authority: JP
Inventors: Kazuhiko Fukutani; 和彦福谷; Mikie Tokunaga; 徳長　幹恵; Yoshimasa Kamata; 鎌田　善政
Original assignee: Nippon Steel Corp
Current assignee: Nippon Steel Corp
Priority date: 1984-06-22
Filing date: 1984-06-22
Publication date: 1986-01-17

Abstract

PURPOSE:To calculate crown quantity from the detected value of the corrected sheet thickness at the edges of a sheet and the detected value of the sheet thickness at the central part thereof and to control the crown quantity with high accuracy in the stage of calculating the crown quantity of the sheet on the outlet side of a rolling mill by correcting the detected value of the sheet thickness at the edges according to the transverse deviation of the sheet width in the position where the thickness at the edges in detected. CONSTITUTION:Edge detectors 3-1, 3-2 which detect both edges of the sheet, a scanning type sheet thickness detector 4-2 which is travelable in the transverse direction of the sheet and a stationary type sheet thickness detector 4-1 fixed to the central part of the width of the sheet are provided on the outlet side of the rolling mill. The transverse profile at the front end of the sheet on the outlet side of the rolling mill is detected by the detector 4-2 and thereafter the sheet is fixed in the position of a specified distance in the central direction from one edge and the sheet thickness at the edges is detected. The extent of the movement in the transverse direction of the sheet based on the time when the sheet profile is detected and the width deviation of the sheet are calculated from the detection signals of the detectors 3-1, 3-2 and the detected value of the thickness at the edges is corrected from the calculated value and the sheet profile. The crown quantity of the sheet is calculated from the corrected thickness at the edges and the central thickness detected by the detector 4-1 and the roll bending is controlled in accordance with the calculated value.

Description

【発明の詳細な説明】（産業上の利用分野）本発明は、板圧延におけるクラウン制御方法に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a crown control method in plate rolling.

（従来の技術）板材の圧延において、圧延板のクラウン量が目標範囲内
となるように制御する方法が従来より行なわれている。(Prior Art) In rolling a plate, a method has been conventionally used to control the crown amount of the rolled plate to be within a target range.

このクラウン制御において、圧延機出側の板のクラウン
量の検出方法は、板の板幅中央部の板厚とエツジ部の板
厚をそれぞれ板厚検出器で検出し、両者の差を求める方
法であり、例えば特公昭５５−７３２４号公報や特開昭
５５−１１２１１４号公報にこのような方法でクラウン
量を検出してロールベンディング装置によシフラウンを
制御する方法が記載されている。In this crown control, the method of detecting the crown amount of the plate on the exit side of the rolling mill is to use a plate thickness detector to detect the thickness at the center of the width of the plate and the thickness at the edge, respectively, and find the difference between the two. For example, Japanese Patent Publication No. 55-7324 and Japanese Unexamined Patent Application Publication No. 55-112114 disclose a method of detecting the amount of crown using such a method and controlling the shrinkage by a roll bending device.

（発明が解決しようとする問題点）ところが、上記引用公報にあるような従来の方法におい
ては、板幅中央部とエツジ部の板厚検出位置すなわち各
板厚検出器の位置が固定されているので、圧延中に板が
板幅方向に移動（ウオーク又は蛇行）したシ板幅が変動
した場合、正確なりラウン量の算出ができないという問
題があった。(Problem to be Solved by the Invention) However, in the conventional method as described in the above cited publication, the plate thickness detection positions at the center and edge parts of the plate width, that is, the positions of each plate thickness detector, are fixed. Therefore, if the width of the plate changes as the plate moves in the width direction (walks or meanderes) during rolling, there is a problem in that the round amount cannot be calculated accurately.

本発明はかかる問題点を解決することを目的とする。The present invention aims to solve such problems.

（問題点を解決するだめの手段）このだめの本発明方法は、ロールベンディング制御を行
なう板圧延におけるクラウン制御方法において、圧延機
出側に板の両エツジを検出するエツジ検出器と板幅方向
に走行可能な走査型板厚検出器と板幅中央部に固定した
固定型板厚検出器とを設け、圧延機出側において板先端
部を走査型板厚検出器で走査して板の幅方向プロフィル
を検出し、以降は走査型板厚検出器を板の一方のエツジ
から中心方向に一定距離の位置に固定してエツジ部の板
厚を検出するとともにエツジ検出器の検出信号から前記
板プロフィル検出時を基準とした板幅方向移動量及び板
幅偏差を算出して該算出値と前記板プロフィルとからエ
ツジ部板厚検出値を補正し、該補正したエツジ部板厚と
固定型板厚検出器で検出した中央部板厚とから板クラウ
ン量を算出し、該算出した板クラウン量にもとずいてロ
ールベンディング制御を行なうことを％徴とするもので
ある。以下本発明を図示の実施例にもとづき詳細に説明
する。(Another Means to Solve the Problem) This method of the present invention uses an edge detector on the exit side of the rolling machine to detect both edges of the plate and an edge detector in the width direction of the plate in the crown control method in plate rolling that performs roll bending control. A scanning type plate thickness detector that can travel along the width of the plate and a fixed type plate thickness detector fixed at the center of the plate width are installed, and the tip of the plate is scanned by the scanning type plate thickness detector on the exit side of the rolling mill to determine the width of the plate. After detecting the direction profile, a scanning plate thickness detector is fixed at a position a certain distance from one edge of the plate toward the center to detect the plate thickness at the edge, and the detection signal of the edge detector is used to detect the thickness of the plate. Calculate the amount of movement in the sheet width direction and sheet width deviation based on the time of profile detection, correct the edge portion sheet thickness detection value from the calculated values and the sheet profile, and combine the corrected edge portion sheet thickness with the fixed mold plate. The percentage feature is to calculate the plate crown amount from the central plate thickness detected by the thickness detector, and perform roll bending control based on the calculated plate crown amount. The present invention will be explained in detail below based on illustrated embodiments.

第１図は本発明を実施するための装置の桐成例を示す図
である。図において１−１．１−２は圧延機ツバツクア
ップロール、２−１．２−２はワークロールであり、３
−１．３−２は圧延機出側の板Ｓのエツジを検出するエ
ツジ検出器、４−１は板Ｓの中央部に相当する位置に置
屋して設（至）した固定型板厚検出器、４−２は板Ｓの
幅方向に走行可能な走査型板厚検出器である。５はエツ
ジ検出器３−１．３−２からの信号を受けて板Ｓの板幅
方向移動量及び板幅偏差を算出する演算装置、６は板厚
検出器４−１．４−２及び演算装置５からの信号を受け
て板Ｓのクラウン量を算出する演算装置、７は演算装置
６からの信号を受けて圧延機のワークサイド及びドライ
ブサイドのペンディング力を決定する信号処理装置、８
−１．９−１及び８−２゜９−２は信号処理装置７から
の信号により、ワークサイド及びドライブサイドのペン
ディング力を制御する制御装置である。FIG. 1 is a diagram showing an example of an apparatus for implementing the present invention. In the figure, 1-1.1-2 is a rolling mill pick-up roll, 2-1.2-2 is a work roll, and 3
-1.3-2 is an edge detector that detects the edge of the plate S on the exit side of the rolling mill, and 4-1 is a fixed type plate thickness detector installed in a position corresponding to the center of the plate S. 4-2 is a scanning plate thickness detector that can move in the width direction of the plate S. 5 is an arithmetic unit that receives the signal from the edge detector 3-1.3-2 and calculates the amount of movement of the plate S in the width direction and the width deviation; 6 is the plate thickness detector 4-1.4-2 and A calculation device that receives a signal from the calculation device 5 and calculates the crown amount of the plate S; 7 is a signal processing device that receives a signal from the calculation device 6 and determines the pending force on the work side and drive side of the rolling mill; 8
-1.9-1 and 8-2.9-2 is a control device that controls the pending force on the work side and drive side based on the signal from the signal processing device 7.

（作用）次に上Ｆ装置の作用を第２図を参照しながら説明する。(effect) Next, the operation of the upper F device will be explained with reference to FIG.

まず板Ｓの先端が走査型板厚検出器４−２の位置近くに
到来したのをエツジ検出器３−１（または３−２）で検
知し、この検知信号によ多走査型板厚検出器を板幅方向
に走査させて板幅方向の板厚を測定し、プロフィルを板
幅方向移動量←）の関数ｆ（ト）として演算装置６に記
憶する。この場合の板Ｓに対する走査型板厚検出器４−
２の走査軌跡は図中点ｅｌ＋ｅｔを含む斜めの点線のよ
うになる。１回の走査を終わった後、走査型板厚検出器
４−２を板中心方向に移動させ板工、ジから一定距離Ｂ
０人った点ｅ、の位置で固定し、以降ｅ４・・・・・・
ｅｌ・・・・・・ｅｎの各点の板厚を測定する。固定型
板厚検出器４−１は板中心位置に固定してＣ，Ｃ，・・
・・・・ＣＩ・・・・・・Ｃ１１の各点の板厚を測定す
る。First, the edge detector 3-1 (or 3-2) detects when the tip of the plate S comes close to the scanning plate thickness detector 4-2, and this detection signal is used to detect the multi-scanning plate thickness. The plate thickness in the width direction is measured by scanning the plate in the width direction, and the profile is stored in the arithmetic unit 6 as a function f(g) of the amount of movement in the width direction. Scanning plate thickness detector 4- for plate S in this case
The scanning locus of No. 2 looks like a diagonal dotted line including point el+et in the figure. After completing one scan, the scanning plate thickness detector 4-2 is moved toward the center of the plate and placed at a certain distance B from the plate work.
It is fixed at the position of point e, where there is 0 people, and from then on e4...
Measure the plate thickness at each point of el...en. The fixed plate thickness detector 4-1 is fixed at the center position of the plate and detects C, C,...
...CI...Measure the plate thickness at each point of C11.

ところで圧延中における板Ｓは前述したように、板幅方
向に移動した９、あるいは板幅が変動したシするので、
走査型板厚検出器による板厚測定は必ずしも板工、ジか
ら一定距離（Ｂｏ）の点を測定しないことになる。そこ
で本発明においては、圧延機出側のエツジ検出器３−１
．３−２により前記板プロフィル検出時を基準とした板
幅方向移動量及び板幅偏差を算出し、次式により走査型
板厚検出器３−２によシ測定した板厚を補正する。By the way, as mentioned above, the plate S during rolling moves in the width direction of the plate 9 or the width of the plate changes, so
Plate thickness measurement using a scanning plate thickness detector does not necessarily measure a point at a certain distance (Bo) from the platework. Therefore, in the present invention, the edge detector 3-1 on the exit side of the rolling mill is
．． 3-2, the amount of movement in the board width direction and the board width deviation based on the time of board profile detection are calculated, and the board thickness measured by the scanning board thickness detector 3-2 is corrected by the following equation.

ｈ’ｅｉ　’　ｈｅｉ　十Ｆ　（ｆＯｅ＞　＋　ｙ　）
　　　　　　　・・・・・−０１゜ここで　ｈ／ｅｉ：
補正後の板厚（ｅｉ点）ｈｅｉ　　：実測板厚（ｅｉ点
）Ｆ（ｆＯＯ，ｙ）：エッジのずれ量ｙに対応した補正量
で板プロフィル関数ｆｆｘＪ及びずれ量ｙの関数上記（１）式の意味を第３図により説明する。第３図の
実線ｆ（ト）は、板先端部の板幅方向の板厚すなわち板
プロフィルを示すものであり、この板プロフィル自体は
同一圧延板については板の長手方向の各位置において概
略等しいものとみなす。いまある測定点ｅｉにおける実
測板厚がｈｅｉであり、このときの板エツジのずれ量（
板の板幅方向移動量と板幅備差を加算した景）がｙであ
ったとすると、このときの板厚測定点は板エツジから規
定の距離Ｂ０の点ではなく距離（Ｂｏ　　ｙ）の点とな
り、規定の点よシも板厚の小さい（又は大きい）箇所を
測定したことになる。従って実測板厚ｈｅｉをずれ量ｙ
に応じて補正する必要がある。この補正の原理は関ａｆ
（１）で示されるプロフィルをもつ板が距離ｙだけ平行
移動したとみなして、第３図に示す（ｈ’ｅｉ　−ｈｅ
ｉ　）で表わされる補正量をｆ（２）とｙとの関数ＦＣ
ｆ（３）、ｙ）から求めるものである。なお板中央部の
板厚は通常の圧延作業で生じる範囲内の板の板幅方向移
ＩＪｔＪＪｔのもとでは測定位置の変化による板厚の変
化量は非常に小さいので、補正は行なわずに測定値をそ
のまま用いても実用上差支えない。上記のようにして補
正したエツジ部板厚及び中央部板厚よシ板のクラウン量
を算出し、この算出したクラウン量にもとずいて公知の
方法によりロールベンディング制御を行なう。h'ei 'hei 10F (fOe> + y)
・・・・・・−01゜Here h/ei:
Plate thickness after correction (ei point) hei: Actual plate thickness (ei point) F (fOO, y): Correction amount corresponding to edge deviation amount y Function of plate profile function ffxJ and deviation amount y (1) above The meaning of the formula will be explained with reference to FIG. The solid line f (g) in Fig. 3 indicates the plate thickness in the plate width direction at the tip of the plate, that is, the plate profile, and this plate profile itself is approximately equal at each position in the longitudinal direction of the plate for the same rolled plate. Consider it as a thing. The actual plate thickness at the current measurement point ei is hei, and the deviation amount of the plate edge at this time (
If the sum of the amount of movement in the board width direction and the difference in board width is y, then the board thickness measurement point is not a point at the specified distance B0 from the board edge, but a point at a distance (Bo y) from the board edge. Therefore, measurements were taken at locations where the plate thickness was smaller (or larger) than the specified points. Therefore, the actual plate thickness hei is the deviation amount y
It is necessary to make corrections accordingly. The principle of this correction is
Assuming that the plate with the profile shown in (1) has moved in parallel by a distance y, it is shown in Figure 3 (h'ei -he
The correction amount expressed by i) is a function FC of f(2) and y
f(3), y). The plate thickness at the center of the plate was measured without any correction because the amount of change in plate thickness due to changes in the measurement position is very small under the width direction shift IJtJJt of the plate within the range that occurs in normal rolling operations. There is no practical problem even if the value is used as is. The crown amount of the edge plate thickness and center plate thickness corrected as described above is calculated, and roll bending control is performed by a known method based on the calculated crown amount.

（発明の効果）本発明は以上のように圧延機出側において板のエツジ部
と中央部の板厚検出値から板クラウン量を算出する際の
エツジ部板厚検出位置の板幅方向ずれ童に応じた板厚検
出値の補正を行なうようにしたので、板のウオークや蛇
行・板幅変動などがあっても正確なりラウン食の算出が
でき、精度の高いクラウン制御を行カうことができる。(Effects of the Invention) As described above, the present invention has the following advantages: When calculating the plate crown amount from the plate thickness detection values at the edge portion and the center portion of the plate on the exit side of the rolling mill, the deviation in the plate width direction of the plate thickness detection position at the edge portion is Since the plate thickness detection value is corrected according to the plate thickness, it is possible to accurately calculate round erosion even when the plate walks, meandering, or changes in plate width, making it possible to perform highly accurate crown control. can.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明を実施するための装置構成例を示す図、
第２図及び第３図は板厚検出方法及び検出値の補正方法
を説明するための図である。１−１．１−２．２−１．２−２　：圧延機ロール３−
１．３−２：エツジ検出器４−１：固定型板厚検出器４−２：走査型板厚検出器５．６：演算装置７：信号処理装置８−１．８−２：制御装置第１図；品Ｗｋ３図FIG. 1 is a diagram showing an example of a device configuration for carrying out the present invention;
FIGS. 2 and 3 are diagrams for explaining a method for detecting plate thickness and a method for correcting detected values. 1-1.1-2.2-1.2-2: Rolling mill roll 3-
1.3-2: Edge detector 4-1: Fixed plate thickness detector 4-2: Scanning plate thickness detector 5.6: Arithmetic device 7: Signal processing device 8-1.8-2: Control device Figure 1; Product Wk3 figure

Claims

【特許請求の範囲】[Claims]

ロールベンディング制御を行なう板圧延におけるクラウ
ン制御方法において、圧延機出側に板の両エッジを検出
するエッジ検出器と板幅方向に走行可能な走査型板厚検
出器と板幅中央部に固定した固定型板厚検出器とを設け
、圧延機出側において板先端部を走査型板厚検出器で走
査して板の幅方向プロフィルを検出し、以降は走査型板
厚検出器を板の一方のエッジから中心方向に一定距離の
位置に固定してエッジ部の板厚を検出するとともにエッ
ジ検出器の検出信号から前記板プロフィル検出時を基準
とした板幅方向移動量及び板幅偏差を算出して該算出値
と前記板プロフィルとからエッジ部板厚検出値を補正し
、該補正したエッジ部板厚と固定型板厚検出器で検出し
た中央部板厚とから板クラウン量を算出し、該算出した
板クラウン量にもとずいてロールベンディング制御を行
なうことを特徴とする板圧延におけるクラウン制御方法
。In the crown control method for plate rolling that performs roll bending control, an edge detector that detects both edges of the plate on the exit side of the rolling machine, a scanning type plate thickness detector that can move in the width direction of the plate, and a sensor fixed at the center of the plate width are used. A fixed plate thickness detector is installed, and the tip of the plate is scanned by a scanning plate thickness detector on the exit side of the rolling machine to detect the widthwise profile of the plate. The plate thickness at the edge portion is detected by fixing the plate at a fixed distance from the edge toward the center, and from the detection signal of the edge detector, the amount of movement in the plate width direction and the plate width deviation are calculated from the detection signal of the plate profile. Then, the detected edge thickness value is corrected from the calculated value and the plate profile, and the plate crown amount is calculated from the corrected edge plate thickness and the central plate thickness detected by the fixed plate thickness detector. A crown control method in plate rolling, characterized in that roll bending control is performed based on the calculated plate crown amount.