JP4106040B2 - Abnormality diagnosis and abnormality avoidance method for steel sheet cooling control device - Google Patents

Abnormality diagnosis and abnormality avoidance method for steel sheet cooling control device Download PDF

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JP4106040B2
JP4106040B2 JP2004093962A JP2004093962A JP4106040B2 JP 4106040 B2 JP4106040 B2 JP 4106040B2 JP 2004093962 A JP2004093962 A JP 2004093962A JP 2004093962 A JP2004093962 A JP 2004093962A JP 4106040 B2 JP4106040 B2 JP 4106040B2
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cooling
steel sheet
temperature
abnormality
width direction
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JP2005279665A (en
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透 明石
康博 立石
潔 和嶋
秀征 森原
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Nippon Steel Corp
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Description

本発明は、熱間圧延鋼板の製造に関し、鋼材の冷却不均一によってもたらされる製品組織のばらつきに基づく品質の悪化、残留応力および形状悪化を防止するための冷却装置の異常診断および異常回避操業に関するものである。   The present invention relates to the manufacture of hot-rolled steel sheets, and relates to an abnormality diagnosis and abnormality avoidance operation of a cooling device for preventing deterioration in quality, residual stress and shape deterioration due to variations in product structure caused by uneven cooling of steel materials. Is.

従来、熱間圧延鋼板の製造に関しては、仕上げ圧延機後の冷却装置によって鋼材の材質をコントロールして来た。熱延鋼板であればROT冷却装置、厚鋼板であればCLC冷却装置がこれに当たる。これらの冷却制御装置は鋼板幅および長手方向に均一になるように幅方向であればエッジマスク、長手方向であれば冷却ヘッダーの個数を冷却終了後の温度計を用いてフィードバック制御または学習による初期設定によってコントロールしている。しかし、冷却設備の操業を継続していくと冷却水の異物によって経年的にヘッダー内部に異物が蓄積されたり、ノズルが詰まってしまった結果、幅方向で不均一冷却が発生したり、設計または製作上の問題で据付時から冷却不均一性を発生させることがある。このようなことが発生すれば、鋼板に対し、温度偏差発生による加工性や強度と言った品質のばらつきが発生するだけでなく、温度偏差によって発生した熱歪が常温時には残留応力となって平坦度不良やキャンバーが発生すると言う問題が発生する。   Conventionally, regarding the production of hot-rolled steel sheets, the material of the steel material has been controlled by a cooling device after the finish rolling mill. If it is a hot-rolled steel sheet, this is the ROT cooling device, and if it is a thick steel sheet, this is the CLC cooling device. These cooling control devices use an edge mask if the width direction is uniform in the width and length direction of the steel sheet, and the number of cooling headers if the length direction is the initial by feedback control or learning using a thermometer after cooling is completed. Controlled by setting. However, as the cooling equipment continues to operate, foreign matter accumulates in the header over time due to foreign matter in the cooling water, or the nozzles are clogged, resulting in uneven cooling in the width direction, design or Due to manufacturing problems, cooling non-uniformity may occur from the time of installation. If this happens, the steel sheet will not only have quality variations such as workability and strength due to the occurrence of temperature deviation, but also the thermal strain caused by the temperature deviation will become residual stress at normal temperature and become flat. The problem that the degree of failure and camber occur occurs.

このような問題が内在していることから、これまで、不均一冷却が発生してしまった後の処理に関する方法や温度偏差が発生した場合設備の管理方法が種々提案されている。
特許文献1では、温度偏差を作り出す冷却装置の異常判定に基づく管理と言うよりは、発生してしまった温度偏差が残留応力となり、その大きさによって形状や曲がりに現れると予測し、形状の矯正を行う精整工程や熱処理工程への通板の判定を行うことが提案されている。
また、特許文献2では熱間圧延機に圧延された圧延鋼材の温度を冷却温度に到達するまで冷却する冷却設備と、この冷却設備の複数箇所に設けられ上記圧延鋼材の温度を測定する温度計と、上記冷却設備の入側で検出された上記圧延鋼材の温度と上記冷却設備の出側で検出された上記圧延鋼材の温度とに基づいて上記圧延鋼材の鋼板温度降下モデルを検索し、この検索した鋼板温度降下モデルから冷却バンク毎の温度降下量を算出する鋼板温度計算部と、上記各冷却バンクの温度降下量を合計する層別学習計算部と、この層別学習計算部で求められた上記各冷却バンクの温度降下量の合計値と上記温度計から得られる上記冷却設備の入側から出側までの実際の温度降下量との誤差を上記鋼板温度計算部で求めた冷却バンク毎の温度降下量に加えた後、この冷却バンク毎の温度降下量に基づいて冷却バンク毎の能力係数を推定する冷却バンク能力係数計算部と、冷却バンク能力係数の推移変化より上記冷却設備の冷却能力を診断する冷却バンク能力診断部とを備えた熱間圧延設備における冷却設備診断装置が提案されている。
特許第3302914号公報 特許第3199975号公報
Since such problems are inherent, various methods relating to processing after non-uniform cooling has occurred and various management methods for equipment when a temperature deviation has occurred have been proposed.
In Patent Document 1, rather than managing based on abnormality determination of a cooling device that creates a temperature deviation, it is predicted that the generated temperature deviation becomes a residual stress and appears in a shape or bend depending on its magnitude, and the shape is corrected. It has been proposed to determine whether or not to pass a finishing process or a heat treatment process.
Moreover, in patent document 2, the cooling equipment which cools the temperature of the rolled steel materials rolled by the hot rolling mill until it reaches the cooling temperature, and the thermometer which is provided in several places of this cooling equipment and measures the temperature of the said rolled steel materials And the steel sheet temperature drop model of the rolled steel material is searched based on the temperature of the rolled steel material detected on the inlet side of the cooling facility and the temperature of the rolled steel material detected on the outlet side of the cooling facility. The steel plate temperature calculation unit that calculates the temperature drop amount for each cooling bank from the searched steel plate temperature drop model, the layered learning calculation unit that sums the temperature drop amount of each cooling bank, and the layered learning calculation unit Further, for each cooling bank, an error between the total temperature drop amount of each cooling bank and the actual temperature drop amount from the inlet side to the outlet side of the cooling facility obtained from the thermometer is obtained by the steel plate temperature calculation unit. Added to the temperature drop of Then, a cooling bank capacity coefficient calculation unit that estimates a capacity coefficient for each cooling bank based on the temperature drop amount for each cooling bank, and a cooling bank for diagnosing the cooling capacity of the cooling facility from changes in the cooling bank capacity coefficient There has been proposed a cooling facility diagnostic apparatus in a hot rolling facility equipped with a capability diagnostic unit.
Japanese Patent No. 3302914 Japanese Patent No. 3199975

しかしながら、特許文献1では、平坦度不良と判定した鋼板は形状や残留応力は精整工程への通板によって改善されるが、増工程になるため、コストが掛かる。また温度分布に基づく判定だけでは組織の不均一性は改善出来ず、そのため強度や加工性等の材質不均一性は生じたままである。また特許文献2の発明は異常判定の部位の区切りが冷却バンク毎になっているが、異常の判定基準が当該冷却バンクの冷却能力の変化を見て判断を行っているため、長手方向の温度不均一性に対する設備操業および管理方法について述べているものの、今回問題としている幅方向の温度偏差に関する提案では無いため、幅方向の温度偏差に関する異常判定は出来ない。また、前述の特許文献2だけでなく、従来の冷却制御においてはその基となる測定温度は鋼板センター部の温度を用いているため、幅方向に不均一温度分布が発生し、板センター部に局所的なムラがあった場合、異常判定や冷却制御そのものも冷却制御目標に対し誤差を生む原因となっている。
本発明は、上述した従来技術が有する問題点を解決するもので、熱延鋼板または厚鋼板の制御冷却装置の不均一冷却を監視し、不均一冷却が発生した場合は原因を精度良く特定し、補修や操業を改善することによって安定して材質および平坦度が良い鋼板を製造する方法および装置を提供することを課題とする。
However, in Patent Document 1, although the shape and residual stress of a steel plate determined to be poor in flatness are improved by passing the plate through the refining process, the cost increases because it is an increasing process. Moreover, the structure non-uniformity cannot be improved only by the determination based on the temperature distribution, and therefore, the material non-uniformity such as strength and workability still occurs. Further, in the invention of Patent Document 2, the part of the abnormality determination part is divided for each cooling bank. However, since the abnormality determination criterion is determined based on the change in the cooling capacity of the cooling bank, the temperature in the longitudinal direction is determined. Although the facility operation and management method for non-uniformity is described, it is not a proposal regarding the temperature deviation in the width direction, which is a problem at this time, and therefore an abnormality determination regarding the temperature deviation in the width direction cannot be made. In addition to the above-mentioned Patent Document 2, in the conventional cooling control, since the measurement temperature that is the basis thereof uses the temperature of the steel plate center portion, a non-uniform temperature distribution occurs in the width direction, and the plate center portion When there is local unevenness, abnormality determination and cooling control itself also cause an error with respect to the cooling control target.
The present invention solves the above-mentioned problems of the prior art, and monitors the non-uniform cooling of the hot-rolled steel plate or thick steel plate control cooling device, and if non-uniform cooling occurs, the cause is accurately identified. It is an object of the present invention to provide a method and an apparatus for stably manufacturing a steel plate having a good material and flatness by improving repairs and operations.

本発明は、上述した課題を解決するためになされたもので、その要旨とするところは以下のとおりである。
(1)厚鋼板および熱延鋼板の製造過程において、鋼板の長さ位置毎または時間毎に、制御冷却後の鋼板の幅方向温度を鋼板全長に渡って測定し、これと共に制御冷却時の冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上の使用有無を測定し、鋼板の幅または長手方向に温度偏差が発生したタイミングと冷却バンク、ノズルおよび/またはヘッダーの使用開始または終了のタイミングとが一致した点を異常部位と判定することを特徴とする鋼板冷却装置の異常診断方法。
(2)厚鋼板および熱延鋼板の製造過程において、鋼板の長さ位置毎または時間毎に、制御冷却前後の鋼板の幅方向温度を鋼板全長に渡って測定し、これと共に制御冷却時の冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上の使用開始および終了のタイミングを鋼板の長さ位置毎または時間毎に測定し、鋼板の幅または長手方向に温度偏差が発生したタイミングと冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上の使用開始または終了のタイミングとが一致した点を異常部位と判定することを特徴とする鋼板冷却装置の異常診断方法。
(3)鋼板の長さ位置および幅位置に測定した温度データをローパスフィルターによって信号処理し、加えて、蛇行および鋼板の幅広がりによるデータへの影響を除く補正をすることを特徴とする(1)または(2)記載の鋼板冷却装置の異常診断方法。
(4)前述の請求項(1)乃至(3)のいずれかに記載の異常診断方法に基づいて特定した異常のある冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上の使用を停止し、これまで使用していなかった他の正常なバンク、ヘッダーおよび/またはノズルで代用して操業を行うことを特徴とする鋼板の冷却装置の異常回避方法。
(5)制御冷却装置の前後に所定の時刻に測定する幅方向温度計データの記録と共に時刻に対して冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上の使用有無を記録する記録装置、冷却前後の温度をコイル位置毎に換算すると共に、使用有無をコイル位置毎に換算し、コイル位置毎に幅方向温度分布と使用有無と比較して異常を検出する演算装置、並びに、警報を出力する警報装置からなることを特徴とした鋼板冷却装置の異常診断装置。
The present invention has been made to solve the above-described problems, and the gist thereof is as follows.
(1) In the manufacturing process of thick steel plates and hot-rolled steel plates, the temperature in the width direction of the steel plate after control cooling is measured over the entire length of the steel plate for each length position or time of the steel plate, and together with this, cooling during control cooling Measure the presence / absence of use of one or more of banks, headers, and nozzles, and determine when the temperature deviation occurs in the width or longitudinal direction of the steel sheet and when to start or end the use of cooling banks, nozzles and / or headers A method for diagnosing abnormality in a steel sheet cooling apparatus, wherein the coincident point is determined as an abnormal part.
(2) In the manufacturing process of thick steel plates and hot-rolled steel plates, the temperature in the width direction of the steel sheet before and after the controlled cooling is measured over the entire length of the steel sheet for each length position or time of the steel sheet, and together with this, cooling during the controlled cooling Measure the start and end timing of any one or more of banks, headers, and nozzles for each length position or time of the steel sheet, and the timing when the temperature deviation occurs in the width or longitudinal direction of the steel sheet and the cooling bank, An abnormality diagnosis method for a steel sheet cooling apparatus, characterized in that a point at which one or more of the header and nozzle coincide with the start or end timing of use is determined as an abnormal part.
(3) The temperature data measured at the length position and the width position of the steel sheet is signal-processed by a low-pass filter, and in addition, correction is performed to eliminate the influence on the data due to meandering and the width expansion of the steel sheet (1 ) Or (2) The abnormality diagnosis method for a steel sheet cooling device.
(4) Stop using any one or more of the cooling bank, the header, and the nozzle having an abnormality identified based on the abnormality diagnosis method according to any one of the above claims (1) to (3), An abnormality avoidance method for a cooling apparatus for a steel sheet, wherein operation is performed by substituting with other normal banks, headers and / or nozzles which have not been used so far.
(5) Recording device for recording width direction thermometer data measured at a predetermined time before and after the control cooling device, and recording whether or not any one of the cooling bank, header and nozzle is used with respect to the time, cooling The front and rear temperatures are converted for each coil position, the presence / absence of use is converted for each coil position, an arithmetic unit that detects an abnormality by comparing the temperature distribution in the width direction and the presence / absence of use for each coil position, and outputs an alarm. An abnormality diagnosis device for a steel sheet cooling device, characterized by comprising an alarm device.

以上説明した本発明により、下記の効果が期待できる。
・ 請求項1記載の鋼板冷却装置の異常診断方法によって、冷却終了後の鋼板全幅に渡った温度分布が時系列および鋼板長毎に測定することで板長手および幅方向の異常冷却を検知が可能となる、併せて時系列および板長毎の各冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上の有無を測定しているので温度偏差が発生したタイミングと同じタイミングで使用を開始した冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上が異常冷却の原因と特定出来る。加えて温度偏差が無くなったタイミングと同じタイミングで使用を止めた冷却バンク、ヘッダーおよび/またはが異常冷却の原因と特定が出来る。
・ 請求項2記載の鋼板冷却装置の異常診断方法によって、冷却装置出側の温度データを測定するだけでなく、入側の温度データを測定し、入出側の温度差を求めることによって冷却前の温度偏差の影響を除くことが出来るため、請求項1の発明に比べ更に精度の良い原因の特定が可能となる。
・ 請求項3記載の鋼板冷却装置の異常診断方法によって、温度データの測定ノイズの処理を行うことによって、局所的な温度バラツキの影響を抑えることが可能となり、異常判定の精度が向上する。
・ 請求項4記載の鋼板冷却装置の異常回避方法では、冷却異常原因部位の特定に基づき、異常部位を外して品質異常や平坦度を悪化させない操業が可能となり、安定した操業が可能となる。
・ 請求項5記載の鋼板冷却装置の異常診断装置によって、温度温度計データや冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上の使用有無データを収集し、鋼板位置または時間位置でデータを揃え、操業中常に冷却装置の異常診断を行う一連の操作をシステム化することによって、常に経年的な劣化を把握することで品質や平坦度を悪化させない操業が可能となる。
本発明は、これらの効果より、熱延鋼板または厚鋼板の制御冷却装置の不均一冷却を監視し、不均一冷却が発生した場合は原因を精度良く特定し、補修や操業を改善することによって安定して材質および平坦度が良い鋼板を製造することができるようになった。
According to the present invention described above, the following effects can be expected.
・ By the abnormality diagnosis method for steel sheet cooling device according to claim 1, it is possible to detect abnormal cooling in the longitudinal and width directions by measuring the temperature distribution over the entire width of the steel sheet after cooling is completed in time series and for each steel sheet length. In addition, since the presence or absence of any one or more of each cooling bank, header, and nozzle for each time series and plate length is measured, the cooling bank that has started to be used at the same timing as when the temperature deviation occurred Any one or more of the header and nozzle can be identified as the cause of abnormal cooling. In addition, the cooling bank, the header, and / or the use stopped at the same timing as the temperature deviation disappears can be identified as the cause of abnormal cooling.
-According to the abnormality diagnosis method for a steel sheet cooling device according to claim 2, not only the temperature data on the cooling device outlet side but also the temperature data on the inlet side is measured, and the temperature difference on the inlet and outlet sides is obtained to determine the temperature difference before cooling. Since the influence of the temperature deviation can be eliminated, the cause can be specified with higher accuracy than the invention of claim 1.
By processing the measurement noise of the temperature data by the abnormality diagnosis method for the steel sheet cooling device according to claim 3, it is possible to suppress the influence of local temperature variation, and the accuracy of abnormality determination is improved.
In the abnormality avoidance method for the steel sheet cooling apparatus according to the fourth aspect, the operation without removing the abnormal part and deteriorating the quality abnormality and the flatness can be performed based on the specification of the part that causes the cooling abnormality, and the stable operation is possible.
-The abnormality diagnosis device for steel sheet cooling device according to claim 5 collects thermothermometer data, usage data of at least one of cooling bank, header and nozzle, and aligns the data at the steel plate position or time position. By systemizing a series of operations for constantly diagnosing the cooling device during operation, it is possible to operate without deteriorating quality and flatness by always grasping deterioration over time.
From these effects, the present invention monitors the non-uniform cooling of the control cooling device for hot-rolled steel plates or thick steel plates, and when non-uniform cooling occurs, identifies the cause with high accuracy and improves repair and operation. Steel sheets with good material and flatness can be manufactured stably.

本発明者らは、鋼板の平坦度が悪化する現象について熱延鋼板および厚鋼板の製造工程を対象に鋼板の平坦度悪化のメカニズムを把握する検討を行い、本発明に至った。本発明者らは、特に熱延鋼板の製造工程において予備検討としてFEMを用いた解析と実機実験を行い、続いて、実機において本発明を実施した。以下にこの詳細を述べる。
図1は、予備検討を行った熱延鋼板の製造工程における仕上げ圧延機以降の製造設備概要図である。熱延鋼板1は、仕上げ圧延機2を通り、所定の製造サイズに圧延され、冷却前幅方向温度計3で幅方向温度分布が測定され、ランアウトテーブル(ROT)4によって通板されながら、所定の材質に作り込むためにROT冷却装置5によって所定の板温度まで冷却され、冷却後幅方向温度計6で温度を測定し、コイラー(巻取り機)7によってコイル状に巻き取られる。
巻き取る板温度は、材質によって色々異なるがおよそ100〜800℃までの範囲であり、本発明において問題としている平坦度は、このコイル温度が室温まで下がった時点で巻き解くと、エッジ部、センター部またはエッジ部とセンター部の間に発生する波形状の急峻度のことである。また平坦度以外にも板が曲がってしまうキャンバーなども平坦度以外の問題で内在する。
The present inventors have studied the phenomenon of deterioration of the flatness of a steel sheet, ascertaining the mechanism of deterioration of the flatness of the steel sheet in the production process of hot-rolled steel sheets and thick steel sheets, and have reached the present invention. The inventors of the present invention conducted analysis and actual machine experiments using FEM as preliminary studies, particularly in the manufacturing process of hot-rolled steel sheets, and subsequently carried out the present invention on actual machines. The details are described below.
FIG. 1 is a schematic diagram of manufacturing equipment after a finish rolling mill in a manufacturing process of a hot-rolled steel sheet subjected to preliminary examination. The hot-rolled steel sheet 1 passes through a finish rolling mill 2 and is rolled to a predetermined production size. A width direction temperature distribution is measured by a width direction thermometer 3 before cooling, and is passed through a run-out table (ROT) 4 while being predetermined. In order to make it into this material, it is cooled to a predetermined plate temperature by the ROT cooling device 5, and after cooling, the temperature is measured by the width direction thermometer 6 and wound by a coiler (winding machine) 7 in a coil shape.
The plate temperature to be wound varies depending on the material, but is in the range of about 100 to 800 ° C. The flatness, which is a problem in the present invention, is unraveled when the coil temperature is lowered to room temperature. This is the steepness of the wave shape generated between the part or edge part and the center part. In addition to the flatness, cambers that bend the plate are inherent in problems other than flatness.

図2に耳波の程度を表す急峻度の定義を示す。鋼板エッジ部の波高さHを波のピッチLで割り、100倍して、パーセント表示で表す。
板の波形状は、板C断面(圧延直角方向断面)に垂直に作用する圧縮応力に対する座屈強度と座屈した後の大たわみ問題と解釈できる。
ここでの予備検討で、ROT冷却装置出側の温度偏差が発生したまま、コイル状態で巻き取られ、最終的に常温まで冷却(多くの場合、空冷)された場合、巻き取り直前の温度偏差によって生じてしまう熱歪がそのまま常温時の残留応力にほぼ等しいことが判明した。
FIG. 2 shows the definition of the steepness indicating the degree of ear waves. Divide the wave height H of the steel plate edge portion by the wave pitch L, multiply by 100, and express it in percentage.
The corrugated shape of the plate can be interpreted as a buckling strength against compressive stress acting perpendicularly to the cross section of the plate C (cross section perpendicular to the rolling direction) and a large deflection problem after buckling.
In this preliminary study, when the temperature deviation on the outlet side of the ROT cooling device has occurred, the coil is wound in a coil state and finally cooled to room temperature (in many cases, air-cooled). It has been found that the thermal strain caused by is almost equal to the residual stress at normal temperature.

図4はあるコイルにおける幅方向温度分布に対し、板幅方向の平均温度に対する温度偏差に対し、線膨張係数とヤング率を掛け、残留応力として変換した例である。図5は、このように変換した残留応力分布を用いてFEMによる座屈大たわみ解析を実施し、平坦度を予測してみた結果である。これらの検討より、冷間時に測定した平坦度と温度偏差に基づく予測が一致することを確認すると共に、冷却中に発生した温度偏差が平坦度に影響を及ぼし、制御冷却の温度偏差を小さくすることが鋼板の平坦度を向上させることを発見した。 FIG. 4 is an example in which the temperature deviation in the width direction of a certain coil is converted to residual stress by multiplying the temperature deviation with respect to the average temperature in the plate width direction by the linear expansion coefficient and Young's modulus. FIG. 5 shows the result of predicting the flatness by conducting a buckling large deflection analysis by FEM using the residual stress distribution thus converted. From these studies, it is confirmed that the flatness measured during cold matches the prediction based on the temperature deviation, and the temperature deviation generated during cooling affects the flatness, reducing the temperature deviation of control cooling. Has been found to improve the flatness of the steel sheet.

図3(a)は鋼板全長に渡った巻き取り直前(冷却終了後)の温度分布である。これと同時に各冷却バンク、ヘッダーおよび/またはの時系列のON−OFF状況を鋼板長さに変換したものが図3(b)である。図3(a)の温度偏差の発生位置と全20バンクある冷却バンクの中でON−OFFのタイミングが一致する冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上を抽出したところ、図(b)で一致する冷却バンクがNo.3バンクであることが確認された。この結果を受け、実際の冷却装置を調査したところ該冷却バンクのヘッダー内およびノズルに異物が堆積し、幅方向に設置したノズルからの冷却水の吐出流量にばらつきがあることが確認されたので、ヘッダーおよびノズルの清掃を行い、幅方向に設置したノズルの均一水量化を行った。その結果、冷却途中から発生した温度偏差は改善され、平坦度も改善された。   FIG. 3A shows the temperature distribution immediately before winding (after the end of cooling) over the entire length of the steel sheet. At the same time, FIG. 3B shows the time series ON-OFF status of each cooling bank, header, and / or converted into a steel plate length. When at least one of a cooling bank, a header, and a nozzle having the same ON-OFF timing is extracted from the cooling banks having 20 banks and the occurrence position of the temperature deviation in FIG. ), The matching cooling bank is No. 3 banks were confirmed. As a result of investigating the actual cooling device, it was confirmed that foreign matter was accumulated in the header of the cooling bank and the nozzles, and that the discharge rate of cooling water from the nozzles installed in the width direction was uneven. The headers and nozzles were cleaned, and the nozzles installed in the width direction were made uniform. As a result, the temperature deviation generated during the cooling was improved, and the flatness was also improved.

本発明のポイントは、冷却操作の中で、鋼板長や材質の作り込み設計に応じて通板スピードの大小および加速および減速に伴って使用される冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上が変化するため、この時間的変動と把握すると共に結果として現れる冷却後の温度分布の変化を時間軸または板長で揃えれば、制御冷却の装置の各冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上の冷却状況を掴むことが出来る点にある。
次に異常と判定される温度偏差の定義は次のように考えた。温度偏差を管理する指標としては品質のバラツキや平坦度不良があるが、品質については製造クォリティーのランクによって自動的に決定されるものである。平坦度不良については板厚や板幅によって座屈限界が変わるので問題となる鋼板の座屈限界に応じて決定される。正確にはFEM等による解析の結果を用いるべきであるが、残留応力を矩形近似し、材料力学で公知である平板の座屈の式で判断しても良い。
The point of the present invention is that any one of the cooling bank, the header, and the nozzle used in the cooling operation according to the length of the plate and the acceleration and deceleration according to the design of the steel plate length and material. As the above changes, if it is grasped as this time variation and the change in the temperature distribution after cooling that appears as a result is aligned with the time axis or plate length, any one of the cooling banks, headers, nozzles of the control cooling device One or more cooling conditions can be grasped.
Next, the definition of the temperature deviation judged to be abnormal was considered as follows. As an index for managing the temperature deviation, there are quality variations and poor flatness, but the quality is automatically determined by the rank of manufacturing quality. The flatness failure is determined according to the buckling limit of the steel plate in question because the buckling limit varies depending on the plate thickness and width. To be precise, the result of analysis by FEM or the like should be used, but the residual stress may be approximated by a rectangle and judged by a flat plate buckling equation known in material mechanics.

異常診断の精度を向上するためには、巻き取り前の温度分布には冷却開始前の温度分布の影響が加わっている。前述までの発明では冷却開始前の温度分布はほぼ均一であることを仮定しているが、実際は冷却開始以前発生した温度偏差と区別するために、冷却開始前の幅方向温度分布と冷却終了後の幅方向温度分布を測定し、鋼板長手位置毎の入側温度分布と出側の温度分布を板幅位置毎に偏差を取り、制御冷却中の板幅温度変化を求めることでさらに確信が持てる診断が可能となる。制御冷却装置以外の原因か否かは、冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上のON−OFFタイミングに一致しなければ、制御冷却以前の問題と判定は可能ではあるが、長手方向にはスキッドマークによる長手方向に周期的な温度変化が内在しており、少なからず冷却出側だけではこの外乱はノイズになる。
さらに、例えば長手方向に約40mmピッチで測定した幅方向の温度データに対し、前後1mの温度分布データに対してデーターの変動に関して調査を行ってみた。その結果、前後1mの温度分布データに対してかなりの温度偏差があった。そしてさらに各板幅位置における前後の温度変化を調べたところ、温度のバラツキは正規分布を取っており、ノイズの可能性があることが判明した。ノイズを含んでいるデータで判定を行うと判定精度が低下するので、判定時にはローパスフィルターや移動平均等の信号処理を行うことが望ましい。
In order to improve the accuracy of abnormality diagnosis, the influence of the temperature distribution before the start of cooling is added to the temperature distribution before winding. In the above-described inventions, it is assumed that the temperature distribution before the start of cooling is almost uniform. However, in order to distinguish it from the temperature deviation that occurred before the start of cooling, the temperature distribution in the width direction before the start of cooling and after the end of cooling are actually By measuring the temperature distribution in the width direction, taking the deviation of the inlet side temperature distribution and the outlet side temperature distribution for each steel plate longitudinal position for each plate width position, and obtaining the plate width temperature change during controlled cooling, you can have more confidence Diagnosis is possible. If the cause other than the control cooling device does not match the ON-OFF timing of any one or more of the cooling bank, header, and nozzle, it can be determined that the problem is before control cooling, but the longitudinal direction There is a periodic temperature change in the longitudinal direction due to the skid mark, and this disturbance becomes noise on the cooling outlet side.
Furthermore, for example, with respect to the temperature data in the width direction measured at a pitch of about 40 mm in the longitudinal direction, an investigation was performed on the data variation of the temperature distribution data of 1 m before and after. As a result, there was a considerable temperature deviation with respect to the temperature distribution data of 1 m before and after. Further, when the temperature change before and after each plate width position was examined, it was found that the temperature variation had a normal distribution and there was a possibility of noise. Since determination accuracy decreases when determination is performed using data that includes noise, it is desirable to perform signal processing such as a low-pass filter and a moving average during determination.

異常診断によって異常部位が判ったとしても操業ラインを直ぐに停止して整備を行うことは不可能であるため、補修を行うまでは、通常の操業では異常温度偏差を解消出来ない。そこで補修タイミングまで異常温度偏差を解消するために異常のある冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上は使用せず、これまで使用していなかった正常な冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上を用いた操業を行うことで一時的に異常温度偏差を解消した操業が可能となる。
以上の取り組みを記憶装置および演算装置を持ったパソコン等によって常時判定および警報を鳴らすことによっても温度偏差が少ない安定した鋼板を製造が可能となる。
これまでの本発明の説明は対象を熱延鋼板としてきたが、厚鋼板に対してもROT冷却をCLC冷却に置き換え、その装置の前後に幅方向の温度計を設置すればそのまま適用が可能である。
Even if the abnormal part is found by the abnormality diagnosis, it is impossible to immediately stop the operation line and perform maintenance. Therefore, the normal temperature operation cannot solve the abnormal temperature deviation until the repair is performed. Therefore, in order to eliminate the abnormal temperature deviation until the repair timing, do not use any one or more of the abnormal cooling banks, headers, and nozzles. Of the normal cooling banks, headers, and nozzles that have not been used so far By performing an operation using one or more of them, an operation in which the abnormal temperature deviation is temporarily eliminated becomes possible.
A stable steel sheet with a small temperature deviation can be manufactured by making the above-described efforts always using a personal computer or the like having a storage device and an arithmetic unit and sounding an alarm.
The description of the present invention so far has been targeted at hot-rolled steel sheets. However, ROT cooling can be replaced with CLC cooling for thick steel sheets, and a thermometer in the width direction can be installed in front of and behind the equipment, as it is. is there.

以下、本発明の実施例について説明する。図1の仕上げ圧延機2出側に設置した板幅方向温度計3および制御冷却終了後の幅方向温度計6を設置する。オンラインで逐次圧延中の鋼板の幅方向温度分布を測定する。同時に鋼板のトラッキング情報として鋼板の位置、通板速度、使用している冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上の時系列使用履歴をプロコン8より、記憶装置9に送る。次に演算装置10にて入出力の温度データは長手方向位置毎の板幅方向の温度分布を加算平均によってノイズ処理を実施し、プロコンより入手した鋼板のトラッキング情報より測定された冷却前後の時系列幅方向温度分布データを鋼板位置毎の温度データに換算する。そして、鋼板位置毎に入出の温度分布変化を幅位置毎に求め、板幅方向に温度分布変化の平均を取る。同時に使用する冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上の時系列単位の使用履歴を鋼板の位置単位に換算する。本実施例において異常判定基準は分布変化が30℃で且つ幅方向100mm、長手方向50m以上の範囲に発生した温度分布を異常温度偏差と規定し、異常判定を行った。図3(a)では板の先端から250〜600の位置で20℃ほど温度が下に外れていた。この外れがNo.3冷却バンクの冷却タイミングと一致しており、No.3冷却バンクに異常があると判定された。このような異常判定に基づき、異常のある冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上を用いない取り組みを行うことによって板幅方向での異常温度偏差が解消され、平坦度の良い鋼板が安定して製造出来るようになった。   Examples of the present invention will be described below. A sheet width direction thermometer 3 and a width direction thermometer 6 after the end of control cooling are installed on the exit side of the finish rolling mill 2 in FIG. Measure the temperature distribution in the width direction of the steel sheet during online rolling. At the same time, as the tracking information of the steel plate, the time series use history of any one or more of the position of the steel plate, the plate passing speed, the used cooling bank, the header, and the nozzle is sent from the process control 8 to the storage device 9. Next, the input / output temperature data in the arithmetic unit 10 is subjected to noise processing by adding and averaging the temperature distribution in the plate width direction for each longitudinal position, and before and after cooling measured from the steel plate tracking information obtained from the process computer. The series width direction temperature distribution data is converted into temperature data for each steel plate position. And the temperature distribution change of entry / exit is calculated | required for every width position for every steel plate position, and the average of temperature distribution change is taken in a plate width direction. The usage history of one or more time series units among the cooling banks, headers, and nozzles used at the same time is converted into the position unit of the steel plate. In the present embodiment, the abnormality determination standard is defined as an abnormal temperature deviation in which a temperature distribution occurring in a range where the distribution change is 30 ° C., the width direction is 100 mm, and the longitudinal direction is 50 m or more is performed. In FIG. 3A, the temperature deviated downward by about 20 ° C. at a position of 250 to 600 from the front end of the plate. This deviation is no. 3 coincides with the cooling timing of the cooling bank. 3 It was determined that there was an abnormality in the cooling bank. Based on such an abnormality determination, an abnormal temperature deviation in the width direction of the plate is eliminated by making an effort not to use any one or more of an abnormal cooling bank, header, or nozzle, and a steel plate with good flatness is obtained. It became possible to manufacture stably.

本発明は鋼板の制御冷却装置の異常を速やかに求めることが可能となり、判定に基づく補修や正常な冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上への使用振替操業により、安定した操業が可能となる。   The present invention makes it possible to promptly determine abnormalities in the steel sheet control cooling device, and stable operation can be achieved by repair based on judgment and transfer operation to one or more of normal cooling banks, headers, and nozzles. It becomes possible.

本発明を成す前の予備検討および本発明の実施例で用いた熱延鋼板の製造工程を模式的に示す図である。It is a figure which shows typically the manufacturing process of the hot-rolled steel plate used in the preliminary examination before making this invention, and the Example of this invention. 耳波の程度を表す急峻度の定義を説明するための図である。It is a figure for demonstrating the definition of the steepness degree showing the grade of an ear wave. (a)冷却終了後の鋼板の板幅および板長手の温度分布を測定した結果を示した図である。(b)鋼板の位置に換算した冷却バンクのON−OFF状態を示した図である。(A) It is the figure which showed the result of having measured the board width of the steel plate after completion | finish of cooling, and the temperature distribution of the board longitudinal direction. (B) It is the figure which showed the ON-OFF state of the cooling bank converted into the position of the steel plate. 温度偏差から熱歪を求め、ヤング率を掛けて予測した幅方向の残留応力分布の例を示した図である。It is the figure which showed the example of the residual stress distribution of the width direction which calculated | required the thermal strain from the temperature deviation, and was multiplied by the Young's modulus. 変換した残留応力分布を用いてFEMによる座屈大たわみ解析を実施し、平坦度を予測してみた結果を示す図である。It is a figure which shows the result of having implemented the buckling large deflection analysis by FEM using the converted residual stress distribution, and estimating flatness.

符号の説明Explanation of symbols

1 鋼板
2 仕上げ圧延機
3 冷却入側幅方向温度計
4 ホットランテーブル(ROT)
5 ROT冷却装置
5a 冷却バンク
5b ヘッダー
5c ノズル
6 冷却出側幅方向温度計
7 コイラー(巻取り機)
8 プロコン(プロセスコンピュータ)
9 記録装置
10 演算装置
11 警報装置
1 Steel plate
2 Finishing rolling mill 3 Cooling entry side width direction thermometer
4 Hot run table (ROT)
5 ROT cooling device
5a Cooling bank 5b Header 5c Nozzle 6 Cooling outlet side width direction thermometer 7 Coiler (winding machine)
8 Procon (process computer)
9 Recording device
10 arithmetic device 11 alarm device

Claims (5)

熱間圧延で製造する鋼板の製造過程において、鋼板の長さ位置毎または時間毎に、制御冷却後の鋼板の幅方向温度分布を鋼板全長に渡って離散的に測定し、これと共に制御冷却時の冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上の使用有無を測定し、鋼板の幅または長手方向に温度偏差が発生したタイミングと冷却バンク、ノズルおよび/またはヘッダーの使用開始または終了のタイミングとが一致した点を異常部位と判定することを特徴とする鋼板冷却装置の異常診断方法。   During the manufacturing process of a steel sheet manufactured by hot rolling, the temperature distribution in the width direction of the steel sheet after controlled cooling is discretely measured over the entire length of the steel sheet for each length position or time of the steel sheet. Measure the presence or absence of use of any one of the cooling banks, headers, and nozzles, and when the temperature deviation occurs in the width or longitudinal direction of the steel sheet and when the cooling banks, nozzles and / or headers start or end A method for diagnosing abnormality in a steel sheet cooling apparatus, wherein the point where the two coincide with each other is determined as an abnormal part. 熱間圧延で製造する鋼板の製造過程において、鋼板の長さ位置毎または時間毎に、制御冷却前後の鋼板の幅方向温度分布を鋼板全長に渡って離散的に測定し、これと共に制御冷却時の冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上の使用開始および終了のタイミングを鋼板の長さ位置毎または時間毎に測定し、鋼板の幅または長手方向に温度偏差が発生したタイミングと冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上の使用開始または終了のタイミングとが一致した点を異常部位と判定することを特徴とする鋼板冷却装置の異常診断方法。   During the manufacturing process of a steel sheet manufactured by hot rolling, the temperature distribution in the width direction of the steel sheet before and after the control cooling is discretely measured over the entire length of the steel sheet for each length position or time of the steel sheet, and at the same time during the control cooling. Measure the start and end timing of any one or more of the cooling banks, headers, and nozzles for each length position or time of the steel sheet, and the timing and cooling when temperature deviation occurs in the width or longitudinal direction of the steel sheet A method for diagnosing abnormality in a steel sheet cooling apparatus, wherein a point at which at least one of a bank, a header, and a nozzle coincides with a use start or end timing is determined as an abnormal part. 鋼板の長さ位置および幅位置に測定した温度データをローパスフィルターによって信号処理し、加えて、蛇行および鋼板の幅広がりによるデータへの外乱を除く補正をすることを特徴とする請求項1または請求項2に記載の鋼板冷却装置の異常診断方法。   The temperature data measured at the length position and the width position of the steel plate is signal-processed by a low-pass filter, and in addition, correction is performed to eliminate disturbance to the data due to meandering and width expansion of the steel plate. Item 3. An abnormality diagnosis method for a steel sheet cooling device according to Item 2. 前述の請求項1乃至請求項3のいずれかに記載の異常診断方法に基づいて特定した異常のある冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上の使用を停止し、これまで使用していなかった他の正常なバンク、ヘッダーおよび/またはノズルで代用して操業を行うことを特徴とする鋼板の冷却装置の異常回避方法。   The use of any one or more of the cooling bank, the header, and the nozzle having an abnormality identified based on the abnormality diagnosis method according to any one of claims 1 to 3 is stopped and used until now. An abnormality avoidance method for a cooling apparatus for a steel sheet, wherein operation is performed by substituting with other normal banks, headers and / or nozzles which have not been provided. 制御冷却装置の前後に所定の時刻に測定する幅方向温度計データの記録と共に時刻に対して冷却バンク、ヘッダー、ノズルのうちいずれか一つ以上の使用有無を記録する記録装置、冷却前後の温度をコイル位置毎に換算すると共に、使用有無をコイル位置毎に換算し、コイル位置毎に幅方向温度分布と使用有無と比較して異常を検出する演算装置、並びに、警報を出力する警報装置からなることを特徴とした鋼板冷却装置の異常診断装置。




A recording device that records the use of one or more of a cooling bank, header, and nozzle with respect to the time, along with recording of width direction thermometer data measured at a predetermined time before and after the control cooling device, temperature before and after cooling From the arithmetic unit that detects the abnormality in comparison with the width direction temperature distribution and the presence / absence of use for each coil position, and the alarm device that outputs an alarm An abnormality diagnosis device for a steel sheet cooling device, characterized in that




JP2004093962A 2004-03-29 2004-03-29 Abnormality diagnosis and abnormality avoidance method for steel sheet cooling control device Expired - Fee Related JP4106040B2 (en)

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