JP6834829B2 - Tandem type cold rolling equipment and tandem type cold rolling equipment plate thickness control method - Google Patents
Tandem type cold rolling equipment and tandem type cold rolling equipment plate thickness control method Download PDFInfo
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Description
本発明は、タンデム式冷間圧延設備の板厚制御技術に関する。 The present invention relates to a plate thickness control technique for a tandem cold rolling facility.
複数の圧延スタンドを備えるタンデム式冷間圧延設備においては、圧延後の鋼帯の板厚が目標の板厚（狙い厚）となるように、最終圧延スタンドの出側の板厚に基づいて圧延ロールの関隙を調節するといった自動板厚制御（ＡＧＣ）が行われることが一般的である。ここで従来の最終圧延スタンド出側の板厚測定方法として、特許文献１には最終圧延スタンドとテンションリールとの間に設置されたブライドルロールの径および回転数とテンションリールの回転数に基づいて鋼帯の平均板厚を算出する方法が開示されている。また、別の方法として最終圧延スタンドの出側に設置された板厚計により板厚を測定する方法もある。 In a tandem cold rolling facility equipped with multiple rolling stands, rolling is performed based on the thickness of the outer side of the final rolling stand so that the thickness of the steel strip after rolling becomes the target thickness (target thickness). It is common to perform automatic plate thickness control (AGC) such as adjusting the gap between rolls. Here, as a conventional method for measuring the plate thickness on the exit side of the final rolling stand, Patent Document 1 describes the diameter and rotation speed of the bridle roll installed between the final rolling stand and the tension reel and the rotation speed of the tension reel. A method of calculating the average plate thickness of a steel strip is disclosed. Another method is to measure the plate thickness with a plate thickness gauge installed on the outlet side of the final rolling stand.
しかしながら、特許文献１の方法を用いた最終圧延スタンド出側の板厚の測定精度は板厚計を用いた場合の測定精度よりも劣ることから、より精度の高い板厚制御を行うためには板厚計を用いて最終圧延スタンド出側の板厚を測定することが好ましい。 However, since the measurement accuracy of the plate thickness on the exit side of the final rolling stand using the method of Patent Document 1 is inferior to the measurement accuracy when the plate thickness meter is used, it is necessary to perform more accurate plate thickness control. It is preferable to measure the plate thickness on the exit side of the final rolling stand using a plate thickness gauge.
一方、板厚計を用いて冷間圧延ラインの板厚制御を行う場合、板厚計の出力値の信頼性が非常に重要となるが、ノイズやその他の板厚計の不具合等の影響により正確な板厚の値が出力されない場合もある。この場合、冷間圧延ラインの板厚制御がうまく機能せず、所望の板厚の鋼帯を得ることができなくなる。これを回避する手法として、最終圧延スタンドの出側で板厚を測定する板厚計の精度を保証するために別の板厚計を更に設置することも考えられる。しかし、これでは最終圧延スタンド出側の板厚の測定のために２台の板厚計を導入することになってしまい、コストの増大を招いてしまう。 On the other hand, when controlling the plate thickness of a cold rolling line using a plate thickness gauge, the reliability of the output value of the plate thickness gauge is very important, but due to the effects of noise and other defects of the plate thickness gauge. The exact plate thickness value may not be output. In this case, the plate thickness control of the cold rolling line does not work well, and it becomes impossible to obtain a steel strip having a desired plate thickness. As a method of avoiding this, it is conceivable to install another plate thickness gauge in order to guarantee the accuracy of the plate thickness gauge that measures the plate thickness on the outlet side of the final rolling stand. However, this would result in the introduction of two plate thickness gauges for measuring the plate thickness on the exit side of the final rolling stand, leading to an increase in cost.
本発明は、上記事情に鑑みてなされたものであり、タンデム式冷間圧延設備における最終圧延スタンド出側の板厚制御を精度良く、低コストで行うことを目的とする。 The present invention has been made in view of the above circumstances, and an object of the present invention is to control the plate thickness on the exit side of the final rolling stand in a tandem cold rolling facility with high accuracy and at low cost.
上記課題を解決する本発明は、複数の圧延スタンドと、最終圧延スタンドの出側に設置された板厚計である出側板厚計とを備えたタンデム式冷間圧延設備であって、最終圧延スタンドの圧延ライン上流側に設置された板厚計である入側板厚計と、前記入側板厚計が設置された圧延スタンド間と同一の圧延スタンド間に設置された板速度計である入側板速度計と、最終圧延スタンドの出側に設置された板速度計である出側板速度計と、前記入側板厚計、前記入側板速度計および前記出側板速度計に基づいて最終圧延スタンドの出側における金属帯板の板厚を推定し、推定された板厚である出側板厚推定値と、前記出側板厚計で測定された板厚である出側板厚測定値との誤差を算出し、前記誤差が所定の閾値の範囲内であるか否かの判定を行い、前記誤差が所定の閾値の範囲内である場合に前記出側板厚測定値に基づいて冷間圧延ラインの板厚制御を実施するように構成された制御部とを備えていることを特徴としている。 The present invention for solving the above problems is a tandem type cold rolling facility provided with a plurality of rolling stands and a plate thickness gauge installed on the output side of the final rolling stand, which is a plate thickness gauge, and is a tandem type cold rolling facility for final rolling. An entry-side plate, which is a plate thickness gauge installed on the upstream side of the rolling line of the stand, and an entry-side plate, which is a plate speedometer installed between the same rolling stands as the rolling stand on which the entry-side plate thickness gauge is installed. The output of the final rolling stand based on the speed meter, the output plate speed meter which is a plate speed meter installed on the output side of the final rolling stand, the input side plate thickness meter, the input side plate speed meter, and the output plate speed meter. The thickness of the metal strip on the side is estimated, and the error between the estimated thickness of the outside plate and the measured value of the outside plate thickness, which is the thickness measured by the outside plate thickness gauge, is calculated. , It is determined whether or not the error is within a predetermined threshold range, and when the error is within a predetermined threshold range, the plate thickness control of the cold rolling line is performed based on the output side plate thickness measurement value. It is characterized by having a control unit configured to carry out.
別の観点による本発明は、複数の圧延スタンドと、最終圧延スタンドの出側に設置された板厚計である出側板厚計とを備えたタンデム式冷間圧延設備の板厚制御方法であって、最終圧延スタンドの圧延ライン上流側で測定された板厚である入側板厚測定値と、前記入側板厚測定値が測定された圧延スタンド間と同一の圧延スタンド間で測定された板速度である入側板速度測定値と、最終圧延スタンドの出側で測定された板速度である出側板速度測定値とに基づいて最終圧延スタンドの出側における金属帯板の板厚を推定し、推定された板厚である出側板厚推定値と、前記出側板厚計で測定された板厚である出側板厚測定値との誤差を算出し、前記誤差が所定の閾値の範囲内であるか否かの判定を行い、前記誤差が所定の閾値の範囲内である場合に前記出側板厚測定値に基づいて冷間圧延ラインの板厚制御を実施することを特徴としている。 From another point of view, the present invention is a plate thickness control method for a tandem type cold rolling facility including a plurality of rolling stands and a plate thickness gauge, which is a plate thickness gauge installed on the output side of the final rolling stand. Then, the plate thickness measured between the rolling stands, which is the plate thickness measured upstream of the rolling line of the final rolling stand, and the rolling stands where the input side plate thickness measurement value was measured, and the plate speed measured between the same rolling stands. The plate thickness of the metal strip on the exit side of the final rolling stand is estimated and estimated based on the input side plate speed measurement value, which is, and the outlet plate speed measurement value, which is the plate speed measured on the exit side of the final rolling stand. The error between the estimated value of the outside plate thickness, which is the thickness of the rolled out plate, and the measured value of the outside plate thickness, which is the plate thickness measured by the outside plate thickness gauge, is calculated, and whether the error is within a predetermined threshold range. It is characterized in that it is determined whether or not, and when the error is within a predetermined threshold range, the plate thickness of the cold rolling line is controlled based on the measured value of the output side plate thickness.
本発明によれば、タンデム式冷間圧延設備における最終圧延スタンド出側の板厚制御を精度良く、低コストで行うことができる。 According to the present invention, it is possible to control the plate thickness on the exit side of the final rolling stand in the tandem cold rolling equipment with high accuracy and at low cost.
以下、本発明の実施形態について、図面を参照しながら説明する。なお、本明細書および図面において、実質的に同一の機能構成を有する要素においては、同一の符号を付することにより重複説明を省略する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and the drawings, elements having substantially the same functional configuration are designated by the same reference numerals to omit duplicate description.
＜第１の実施形態＞
図１に示すように第１の実施形態におけるタンデム式冷間圧延設備１は、第１圧延スタンド２ａ〜第５圧延スタンド２ｅからなる複数の圧延スタンド２ａ〜２ｅを備えている。金属帯板の一例である鋼帯Ｓは図１中の左側から右側に向かって送られる。なお、圧延スタンド２ａ〜２ｅの数は特に限定されない。また、各圧延スタンド２ａ〜２ｅの詳細な構造は従来と同様であるため、説明を省略する。以降の説明では、冷間圧延ラインの最も下流側に配置された圧延スタンドである第５圧延スタンド２ｅを“最終圧延スタンド２ｅ”と称す。
<First Embodiment>
As shown in FIG. 1, the tandem type cold rolling equipment 1 in the first embodiment includes a plurality of rolling stands 2a to 2e including a first rolling stand 2a to a fifth rolling stand 2e. The steel strip S, which is an example of the metal strip, is sent from the left side to the right side in FIG. The number of rolling stands 2a to 2e is not particularly limited. Further, since the detailed structure of each rolling stand 2a to 2e is the same as the conventional one, the description thereof will be omitted. In the following description, the fifth rolling stand 2e, which is a rolling stand arranged on the most downstream side of the cold rolling line, will be referred to as a "final rolling stand 2e".
第１の実施形態では、第１圧延スタンド２ａと第２圧延スタンド２ｂの間および最終圧延スタンド２ｅの出側に鋼帯Ｓの板厚を測定する板厚計３が設置されている。板厚計３は例えばＸ線方式のものが用いられる。また、各圧延スタンド２ａ〜２ｅのそれぞれの出側には鋼帯Ｓの板速度を測定する板速度計４が設置されている。 In the first embodiment, a plate thickness meter 3 for measuring the plate thickness of the steel strip S is installed between the first rolling stand 2a and the second rolling stand 2b and on the exit side of the final rolling stand 2e. As the plate thickness meter 3, for example, an X-ray system is used. Further, a plate speedometer 4 for measuring the plate speed of the steel strip S is installed on each exit side of each rolling stand 2a to 2e.
冷間圧延設備１は、鋼帯Ｓの自動板厚制御（ＡＧＣ）を行う制御部（不図示）を備えている。第１の実施形態の制御部は、板厚計３や板速度計４から送られる鋼帯Ｓの板厚や板速度等の情報に基づいて最終圧延スタンド２ｅ出側の板厚の推定値を算出するよう構成されている。また、制御部は、算出された板厚の推定値と、最終圧延スタンド２ｅ出側の板厚計で測定された板厚の測定値との誤差を算出し、その誤差が所定の閾値の範囲内であるか否かを判定する。さらに制御部は、その誤差が所定の閾値の範囲内であると判定した後に、出側板厚測定値に基づいて各圧延スタンド２ａ〜２ｅ間の張力および各圧延スタンド２ａ〜２ｅの圧延ロールの間隙を調節する冷間圧延ラインの自動板厚制御を実施するよう構成されている。 The cold rolling equipment 1 includes a control unit (not shown) that automatically controls the thickness of the steel strip S (AGC). The control unit of the first embodiment estimates the plate thickness on the exit side of the final rolling stand 2e based on information such as the plate thickness and plate speed of the steel strip S sent from the plate thickness gauge 3 and the plate speedometer 4. It is configured to calculate. Further, the control unit calculates an error between the calculated estimated value of the plate thickness and the measured value of the plate thickness measured by the plate thickness gauge on the exit side of the final rolling stand 2e, and the error is within a predetermined threshold range. Judge whether or not it is within. Further, after determining that the error is within the range of a predetermined threshold value, the control unit determines that the tension between the rolling stands 2a to 2e and the gap between the rolling rolls of the rolling stands 2a to 2e are based on the measured value of the outer plate thickness. It is configured to carry out automatic plate thickness control of the cold rolling line to adjust.
第１の実施形態のタンデム式冷間圧延設備１は以上のように構成されている。次に、このタンデム式冷間圧延設備１の板厚制御方法について説明する。 The tandem cold rolling equipment 1 of the first embodiment is configured as described above. Next, a method for controlling the plate thickness of the tandem cold rolling equipment 1 will be described.
なお、以降の説明においては、最終圧延スタンド２ｅの出側に設置された板厚計３を“出側板厚計３ｂ”と称し、最終圧延スタンド２ｅの出側に設置された板速度計４を“出側板速度計４ｂ”と称す。また、最終圧延スタンド２ｅの出側に設置された板厚計３を出側板厚計３ｂと称することに対応させて、最終圧延スタンド２ｅの冷間圧延ライン上流側に設置された、第１圧延スタンド２ａと第２圧延スタンド２ｂとの間の板厚計３を“入側板厚計３ａ”と称す。同様に、入側板厚計３ａが設置された圧延スタンド間と同一の圧延スタンド間、すなわち、第１圧延スタンド２ａと第２圧延スタンド２ｂとの間に設置された板速度計４を“入側板速度計４ａ”と称す。本明細書における“入側板厚計”および“入側板速度計”に関する“入側”とは、圧延スタンドの直前という意味だけでなく、圧延ラインの上流側という意味も含む。 In the following description, the plate thickness gauge 3 installed on the outlet side of the final rolling stand 2e is referred to as "outside plate thickness gauge 3b", and the plate speedometer 4 installed on the outlet side of the final rolling stand 2e is referred to. It is called "outside plate speedometer 4b". Further, the first rolling, which is installed on the upstream side of the cold rolling line of the final rolling stand 2e, corresponds to the plate thickness gauge 3 installed on the outlet side of the final rolling stand 2e being referred to as the output side plate thickness gauge 3b. The plate thickness gauge 3 between the stand 2a and the second rolling stand 2b is referred to as an "entry side plate thickness gauge 3a". Similarly, the plate speedometer 4 installed between the same rolling stands as the rolling stands on which the entry side plate thickness gauge 3a is installed, that is, between the first rolling stand 2a and the second rolling stand 2b, is referred to as "entry side plate". It is called a speedometer 4a ". In the present specification, the "entry side" with respect to the "entry side plate thickness gauge" and the "entry side plate speedometer" includes not only the meaning immediately before the rolling stand but also the upstream side of the rolling line.
第１の実施形態における冷間圧延ラインの板厚制御は、図２に示すフローチャートに沿って行われる。まず出側板厚計３ｂにより最終圧延スタンド２ｅ出側の鋼帯Ｓの板厚が測定される（ステップＳ１００）。続いて、制御部は、入側板厚計３ａで測定された板厚の測定値（以下、“入側板厚測定値”）と、入側板速度計４ａで測定された板速度の測定値（以下、“入側板速度測定値”）と、出側板速度計４ｂで測定された板速度の測定値（以下、“出側板速度測定値”）とを用いて、下記（１）式から最終圧延スタンド２ｅ出側の鋼帯Ｓの板厚の推定値（以下、“出側板厚推定値”）を算出する（ステップＳ１０１）。
出側板厚推定値＝入側板厚測定値×（入側板速度測定値／出側板速度測定値）…（１）
The plate thickness control of the cold rolling line in the first embodiment is performed according to the flowchart shown in FIG. First, the plate thickness of the steel strip S on the exit side of the final rolling stand 2e is measured by the output side plate thickness meter 3b (step S100). Subsequently, the control unit receives a measured value of the plate thickness measured by the input side plate thickness meter 3a (hereinafter, “input side plate thickness measurement value”) and a measured value of the plate speed measured by the input side plate speedometer 4a (hereinafter, “input side plate thickness measurement value”). , "Measured value of input side plate speed") and the measured value of plate speed measured by the exit side plate speedometer 4b (hereinafter, "measured value of exit side plate speed"), from the following equation (1), the final rolling stand 2e An estimated value of the plate thickness of the steel strip S on the protruding side (hereinafter, “estimated value of the protruding side plate thickness”) is calculated (step S101).
Estimated output side plate thickness = Measured value of input side plate thickness x (Measured value of input side plate speed / Measured value of exit side plate speed) ... (1)
冷間圧延においては圧延時の板幅変動代が微小であることから、圧延スタンドの前後の板速度の変化が板厚の変化であるとみなすことができる。このため、上記（１）式のように最終圧延スタンド２ｅの入側と出側の板速度の変化から最終圧延スタンド２ｅ出側の板厚を推定することができる。 In cold rolling, the plate width fluctuation allowance during rolling is very small, so the change in plate speed before and after the rolling stand can be regarded as the change in plate thickness. Therefore, the plate thickness on the exit side of the final rolling stand 2e can be estimated from the change in the plate speed on the entry side and the exit side of the final rolling stand 2e as in the above equation (1).
出側板厚推定値を算出後、制御部は、出側板厚推定値と、出側板厚計３ｂで測定された最終圧延スタンド２ｅ出側の板厚の測定値（以下、“出側板厚測定値”）とを比較する（ステップＳ１０２）。その後、制御部は、出側板厚推定値と出側板厚測定値の誤差を算出し、算出された誤差が予め設定された所定の閾値の範囲内にあるか否かの判定を行う（ステップＳ１０３）。ステップＳ１０３における誤差の算出方法は特に限定されず、出側板厚測定値から出側板厚推定値を差し引いて誤差の程度を判定しても良いし、出側板厚推定値と出側板厚測定値の比を求めて誤差の程度を判定しても良い。所定の閾値は、要求される製品の板厚精度に応じて適宜定められるものであり、板厚計や板速度計の仕様や圧延条件等に応じて適宜変更される。 After calculating the output side plate thickness estimated value, the control unit determines the output side plate thickness estimated value and the measured value of the final rolling stand 2e output side plate thickness measured by the output side plate thickness meter 3b (hereinafter, "exit side plate thickness measurement value"). ") Is compared (step S102). After that, the control unit calculates an error between the output side plate thickness estimated value and the output side plate thickness measurement value, and determines whether or not the calculated error is within a predetermined threshold value set in advance (step S103). ). The method of calculating the error in step S103 is not particularly limited, and the degree of error may be determined by subtracting the output side plate thickness estimated value from the output side plate thickness measurement value, or the output side plate thickness estimated value and the output side plate thickness measurement value. The degree of error may be determined by obtaining the ratio. The predetermined threshold value is appropriately determined according to the required plate thickness accuracy of the product, and is appropriately changed according to the specifications of the plate thickness gauge and the plate speedometer, the rolling conditions, and the like.
上記のステップＳ１０３において出側板厚推定値と出側板厚測定値との誤差が所定の閾値の範囲内にある場合には、出側板厚測定値が十分に信頼できるものであるため、出側板厚計３ｂで測定された出側板厚測定値に基づいて圧延ロールの間隙の設定を変更するなどの板厚制御が行われる（ステップＳ１０４）。 When the error between the output side plate thickness estimated value and the output side plate thickness measurement value is within a predetermined threshold range in step S103 above, the output side plate thickness measurement value is sufficiently reliable and therefore the output side plate thickness is sufficient. Plate thickness control such as changing the setting of the gap of the rolling roll is performed based on the output side plate thickness measurement value measured in total 3b (step S104).
一方、上記のステップＳ１０３において出側板厚推定値と出側板厚測定値との誤差が所定の閾値の範囲外である場合には、制御部は出側板厚計３ｂの出力値の信頼性の低下が懸念されると判断し、警告信号を出力する（ステップＳ１０５）。制御部から出力された警告信号は、例えば図示しないモニター等の表示装置に警告情報として表示されることでオペレーターに通知される。その後、冷間圧延ラインを停止して出側板厚計３ｂの較正試験が行われる。なお、ステップＳ１０３において出側板厚推定値と出側板厚測定値の誤差が所定の閾値の範囲外にある場合は、出側板厚測定値を用いた板厚制御は行われない。この場合、圧延ロールの関隙などはそれまでの設定と同設定のままで維持される。 On the other hand, if the error between the output side plate thickness estimated value and the output side plate thickness measurement value is out of the predetermined threshold value in step S103, the control unit reduces the reliability of the output value of the output side plate thickness meter 3b. Is determined to be a concern, and a warning signal is output (step S105). The warning signal output from the control unit is notified to the operator by being displayed as warning information on a display device such as a monitor (not shown). After that, the cold rolling line is stopped and a calibration test of the output side plate thickness meter 3b is performed. If the error between the output side plate thickness estimated value and the output side plate thickness measurement value is outside the predetermined threshold value in step S103, the plate thickness control using the output side plate thickness measurement value is not performed. In this case, the gaps of the rolling rolls are maintained at the same settings as before.
以上のように第１の実施形態におけるタンデム式冷間圧延設備１の板厚制御方法によれば、最終圧延スタンド２ｅ出側に設置された出側板厚計３ｂの信頼性を、入側板厚計３ａ、入側板速度計４ａおよび出側板速度計４ｂから得られる各測定値から確認することができる。これにより出側板厚計３ｂの信頼性確認用に別の板厚計３を最終圧延スタンド２ｅの出側に設ける必要がなくなり、低コストで精度の高い板厚制御を実施することが可能となる。 As described above, according to the plate thickness control method of the tandem type cold rolling equipment 1 in the first embodiment, the reliability of the outlet side plate thickness gauge 3b installed on the outlet side of the final rolling stand 2e is determined by the input side plate thickness gauge. It can be confirmed from each measured value obtained from 3a, the entry side plate speedometer 4a and the exit side plate speedometer 4b. As a result, it is not necessary to provide another plate thickness gauge 3 on the outlet side of the final rolling stand 2e to confirm the reliability of the output side plate thickness gauge 3b, and it is possible to carry out highly accurate plate thickness control at low cost. ..
なお、従前のタンデム式冷間圧延設備１においては、最終圧延スタンド２ｅの圧延ライン上流側に板厚計３や板速度計４が設置されていることが多く、第１の実施形態の板厚制御方法を実施するにあたってのコストの増加は抑えられる。また、板速度計４を増設することになったとしても、板速度計４は板厚計３よりも安価であり、最終圧延スタンド２ｅの出側の板厚計３ｂの精度保証用に別の板厚計３を設けるよりはコストを抑えて上記の板厚制御方法を実施することが可能である。 In the conventional tandem type cold rolling equipment 1, a plate thickness gauge 3 and a plate speedometer 4 are often installed on the upstream side of the rolling line of the final rolling stand 2e, and the plate thickness of the first embodiment is provided. The increase in cost for implementing the control method is suppressed. Further, even if the plate speedometer 4 is to be added, the plate speedometer 4 is cheaper than the plate thickness meter 3, and is provided separately for guaranteeing the accuracy of the plate thickness meter 3b on the exit side of the final rolling stand 2e. It is possible to carry out the above-mentioned plate thickness control method at a lower cost than providing the plate thickness meter 3.
なお、ステップＳ１００の鋼帯Ｓの板厚測定を通板中のどのタイミングで行うかについては特に限定されない。ただし、鋼帯Ｓの通板速度は各圧延スタンド２ａ〜２ｅのそれぞれの入側と出側で変化する一方で、冷間圧延ライン全体として見た場合にも様々な要因により加減速が生じて変化する場合がある。冷間圧延ライン全体としての通板速度に加減速が生じていると、最終圧延スタンド２ｅの入側と出側との板速度の差が板厚変化とみなすことを前提にした上記（１）式から算出される板厚の推定精度が低下する。このため、ステップＳ１００においては、冷間圧延ライン全体として見たときに鋼帯Ｓの通板速度に加減中または減速中ではない一定速となっている状態で出側板厚測定値の測定と出側板厚推定値の算出を行うことが好ましい。これにより出側板厚計３ｂの信頼性をより高いレベルで評価することができる。 The timing at which the plate thickness of the steel strip S in step S100 is measured during the plate is not particularly limited. However, while the plate passing speed of the steel strip S changes on the inlet side and the outlet side of each of the rolling stands 2a to 2e, acceleration / deceleration occurs due to various factors when viewed as a whole cold rolling line. May change. If acceleration / deceleration occurs in the plate passing speed of the entire cold rolling line, it is assumed that the difference in plate speed between the entry side and the exit side of the final rolling stand 2e is regarded as a plate thickness change (1). The estimation accuracy of the plate thickness calculated from the formula is reduced. Therefore, in step S100, the measured value of the output side plate thickness is measured and output in a state where the plate passing speed of the steel strip S is not being adjusted or decelerated when viewed as a whole cold rolling line. It is preferable to calculate the estimated side plate thickness. As a result, the reliability of the output side plate thickness meter 3b can be evaluated at a higher level.
＜第２の実施形態＞
そのようにステップＳ１００で冷間圧延ラインが一定速状態となった場合に限って出側板厚計３ｂの信頼性を評価することは、制御が煩雑になるため、第２の実施形態では別の方法で出側板厚計３ｂの信頼性評価の精度を向上させる。第２の実施形態では、図３に示すフローチャートに沿った制御が周期的に行われることで、冷間圧延ラインの板厚制御が行われる。
<Second embodiment>
In the second embodiment, it is different to evaluate the reliability of the output side plate thickness meter 3b only when the cold rolling line is in a constant speed state in step S100. The method improves the accuracy of reliability evaluation of the output side plate thickness meter 3b. In the second embodiment, the plate thickness of the cold rolling line is controlled by periodically performing the control according to the flowchart shown in FIG.
まず図２に示すステップＳ１００と同様に、出側板厚計３ｂにより出側板厚測定値を測定した後（ステップＳ２００）、図２に示すステップ１０１と同様に、出側板厚推定値を算出する（ステップＳ２０１）。第２の実施形態における制御部は、ここで現在までに算出された各出側板厚測定値の平均値、すなわちステップＳ２０１で新たに算出された出側板厚推定値と、過去の出側板厚推定値との平均値を算出する（ステップＳ２０２）。続いて、制御部は、その各出側板厚推定値の平均値と出側板厚測定値とを比較する（ステップＳ２０３）。その後、制御部は、その各出側板厚推定値の平均値と出側板厚測定値の誤差を算出し、算出された誤差が予め設定された所定の閾値の範囲内にあるか否かの判定を行う（ステップＳ２０４）。そして、制御部は、算出された誤差が所定の閾値の範囲内にある場合は出側板厚測定値に基づいて板厚制御を行い（ステップＳ２０５）、算出された誤差が所定の閾値の範囲内にある場合は警告信号を出力する（ステップＳ２０６）。 First, in the same manner as in step S100 shown in FIG. 2, the measured value of the outgoing side plate thickness is measured by the outgoing side plate thickness meter 3b (step S200), and then the estimated value of the outgoing side plate thickness is calculated in the same manner as in step 101 shown in FIG. Step S201). The control unit in the second embodiment has the average value of each output side plate thickness measurement value calculated up to now, that is, the output side plate thickness estimated value newly calculated in step S201 and the past output side plate thickness estimation. The average value with the value is calculated (step S202). Subsequently, the control unit compares the average value of each output side plate thickness estimated value with the output side plate thickness measurement value (step S203). After that, the control unit calculates an error between the average value of each output side plate thickness estimated value and the output side plate thickness measurement value, and determines whether or not the calculated error is within a predetermined threshold value set in advance. (Step S204). Then, when the calculated error is within the range of the predetermined threshold value, the control unit controls the plate thickness based on the measured value of the output side plate thickness (step S205), and the calculated error is within the range of the predetermined threshold value. If it is, a warning signal is output (step S206).
上記のような第２の実施形態の出側板厚推定値の平均値は、冷間圧延ライン全体としての通板速度が加速状態にあるとき、または減速状態にあるとき、または一定速状態にあるときの影響を含む値である。すなわち、その平均値は、出側板厚推定値の精度に寄与する加速時の影響と減速時の影響が相殺されて加減速時の影響が小さくなった出側板厚推定値である。したがって、そのような出側板厚推定値の平均値を用いることにより、出側板厚計３ｂの信頼性評価をより精度良く行うことが可能となる。 The average value of the output side plate thickness estimates of the second embodiment as described above is when the plate passing speed of the entire cold rolling line is in the acceleration state, the deceleration state, or the constant speed state. It is a value including the influence of time. That is, the average value is an estimated output side plate thickness in which the effect during acceleration and the effect during deceleration, which contribute to the accuracy of the estimated output side plate thickness, are offset and the effect during acceleration / deceleration is reduced. Therefore, by using the average value of such an estimated value of the output side plate thickness, it is possible to more accurately evaluate the reliability of the output side plate thickness meter 3b.
以上、本発明の実施形態について説明したが、本発明はかかる例に限定されない。当業者であれば、特許請求の範囲に記載された技術的思想の範疇内において、各種の変更例または修正例に想到しうることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。 Although the embodiments of the present invention have been described above, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the technical idea described in the claims, and of course, the technical scope of the present invention also includes them. It is understood that it belongs to.
例えば入側板厚計３ａと入側板速度計４ａが設けられる箇所は、第１圧延スタンド２ａと第２圧延スタンド２ｂとの間に限定されず、その他の圧延スタンド間であっても良い。冷間圧延においては圧延スタンド前後における板幅変動が微小ではあるが、わずかな変動は生じるため、精度良く最終圧延スタンド２ｅ出側の板厚を推定するためには、最終圧延スタンド２ｅ近くに入側板厚計３ａと入側板速度計４ａを設置することが好ましい。例えば第４圧延スタンドと最終圧延スタンド２ｅとの間に板厚計３と板速度計４が設置されている冷間圧延設備１においては、これらの板厚計３と板速度計４の測定値を用いて最終圧延スタンド２ｅ出側の板厚を推定することが好ましい。これにより最終圧延スタンド２ｅ出側の板厚計３ｂの信頼性評価を高いレベルで行うことが可能となる。 For example, the location where the entry-side plate thickness meter 3a and the entry-side plate speedometer 4a are provided is not limited to between the first rolling stand 2a and the second rolling stand 2b, and may be between other rolling stands. In cold rolling, the plate width fluctuation before and after the rolling stand is small, but slight fluctuation occurs. Therefore, in order to accurately estimate the plate thickness on the exit side of the final rolling stand 2e, enter near the final rolling stand 2e. It is preferable to install a side plate thickness meter 3a and an entry side plate speedometer 4a. For example, in the cold rolling equipment 1 in which the plate thickness gauge 3 and the plate speedometer 4 are installed between the fourth rolling stand and the final rolling stand 2e, the measured values of the plate thickness gauge 3 and the plate speedometer 4 It is preferable to estimate the plate thickness on the exit side of the final rolling stand 2e using. This makes it possible to evaluate the reliability of the plate thickness meter 3b on the exit side of the final rolling stand 2e at a high level.
また、上記実施形態では冷間圧延設備１における圧延対象を鋼帯としたが、帯板状のチタン板や銅板等のその他の金属帯板であっても良い。 Further, in the above embodiment, the rolling target in the cold rolling equipment 1 is a steel strip, but other metal strips such as a strip-shaped titanium plate and a copper plate may be used.
最終圧延スタンドの出側に設置された較正後の出側板厚計を用いて測定された板厚測定値と、新方式（本発明に係る方式）および旧方式で推定された板厚推定値との偏差を求め、各方式で算出された板厚推定値と、出側板厚計で測定された板厚測定値とのずれの程度について評価した。その結果を図４に示す。図４では板厚測定値と板厚推定値との偏差を％表記で示している。 Plate thickness measurement values measured using a calibrated output plate thickness gauge installed on the output side of the final rolling stand, and plate thickness estimates estimated by the new method (method according to the present invention) and the old method. The deviation between the estimated plate thickness calculated by each method and the measured plate thickness measured by the output side plate thickness gauge was evaluated. The result is shown in FIG. In FIG. 4, the deviation between the measured plate thickness value and the estimated plate thickness value is shown in% notation.
なお、新方式の板厚推定値とは、鋼帯全長に亘って繰り返し上記（１）式を用いて算出した板厚推定値の平均値である。旧方式の板厚推定値とは、最終圧延スタンドの下流側に設けられた巻き取りリールが１回転した際の外径の増加量に基づいて算出される板厚を、巻き取りリールが１回転する毎に算出してコイル全周分で平均化したものである。出側板厚計で測定される板厚測定値は鋼帯全長分の測定値の平均値である。 The plate thickness estimation value of the new method is an average value of the plate thickness estimation values calculated repeatedly using the above equation (1) over the entire length of the steel strip. The plate thickness estimate of the old method is the plate thickness calculated based on the amount of increase in the outer diameter when the take-up reel provided on the downstream side of the final rolling stand makes one rotation, and the take-up reel makes one rotation. It is calculated each time and averaged over the entire circumference of the coil. The plate thickness measurement value measured by the output side plate thickness gauge is the average value of the measured values for the entire length of the steel strip.
図４に示すように新方式における板厚推定値は、出側板厚計により測定された板厚測定値に対して±１％以内に収まると共に、旧方式の板厚推定値よりもばらつきが小さくなっている。出側板厚計は較正後のものを使用していることから、図４に示される結果は、新方式で算出された板厚推定値が鋼帯の実際の板厚に近い数値であることを意味する。このため、本実施例で使用した冷間圧延設備の場合、例えば新方式で算出された板厚推定値と、出側板厚計による板厚測定値との誤差を算出し、許容する誤差の閾値として±１％と設定しておけば、この閾値の範囲外となる場合に出側板厚計の信頼性に問題があると判断することができる。したがって、誤った板厚データに基づいて冷間圧延ラインの板厚制御が実施されないようにすることができる。このように本発明に係る板厚制御方法によれば、最終圧延スタンド出側に設置された出側板厚計の信頼性保証用に別の板厚計を設けずに、鋼帯の自動板厚制御を実施することができる。 As shown in FIG. 4, the plate thickness estimation value in the new method is within ± 1% of the plate thickness measurement value measured by the output side plate thickness gauge, and the variation is smaller than the plate thickness estimation value in the old method. It has become. Since the output side plate thickness gauge is used after calibration, the result shown in FIG. 4 shows that the plate thickness estimate calculated by the new method is close to the actual plate thickness of the steel strip. means. Therefore, in the case of the cold rolling equipment used in this embodiment, for example, the error between the plate thickness estimated value calculated by the new method and the plate thickness measurement value by the output side plate thickness gauge is calculated, and the allowable error threshold is calculated. If it is set to ± 1%, it can be determined that there is a problem in the reliability of the output plate thickness gauge when it is out of the range of this threshold value. Therefore, it is possible to prevent the plate thickness control of the cold rolling line from being performed based on the incorrect plate thickness data. As described above, according to the plate thickness control method according to the present invention, the automatic plate thickness of the steel strip is not provided to guarantee the reliability of the output side plate thickness gauge installed on the outlet side of the final rolling stand. Control can be implemented.
本発明は、タンデム式冷間圧延設備の板厚制御に利用することができる。 The present invention can be used for controlling the plate thickness of a tandem cold rolling facility.
１ タンデム式冷間圧延設備
２ａ 第１圧延スタンド
２ｂ 第２圧延スタンド
２ｃ 第３圧延スタンド
２ｄ 第４圧延スタンド
２ｅ 第５圧延スタンド（最終圧延スタンド）
３ 板厚計
３ａ 入側板厚計
３ｂ 出側板厚計
４ 板速度計
４ａ 入側板速度計
４ｂ 出側板速度計
Ｓ 鋼帯
1 Tandem type cold rolling equipment 2a 1st rolling stand 2b 2nd rolling stand 2c 3rd rolling stand 2d 4th rolling stand 2e 5th rolling stand (final rolling stand)
3 Plate thickness meter 3a Enter side plate thickness meter 3b Out side plate thickness meter 4 Plate speedometer 4a Enter side plate speedometer 4b Out side plate speedometer S Steel strip
Claims (4)
最終圧延スタンドの圧延ライン上流側に設置された板厚計である入側板厚計と、
前記入側板厚計が設置された圧延スタンド間と同一の圧延スタンド間に設置された板速度計である入側板速度計と、
最終圧延スタンドの出側に設置された板速度計である出側板速度計と、
前記入側板厚計、前記入側板速度計および前記出側板速度計に基づいて最終圧延スタンドの出側における金属帯板の板厚を推定し、推定された板厚である出側板厚推定値と、前記出側板厚計で測定された板厚である出側板厚測定値との誤差を算出し、前記誤差が所定の閾値の範囲内であるか否かの判定を行い、前記誤差が所定の閾値の範囲内である場合に前記出側板厚測定値に基づいて冷間圧延ラインの板厚制御を実施するように構成された制御部とを備えている、タンデム式冷間圧延設備。 It is a tandem type cold rolling equipment equipped with a plurality of rolling stands and a plate thickness gauge, which is a plate thickness gauge installed on the output side of the final rolling stand.
The input side plate thickness gauge, which is a plate thickness gauge installed on the upstream side of the rolling line of the final rolling stand,
An entry-side plate speedometer, which is a plate speedometer installed between rolling stands where the entry-side plate thickness gauge is installed and between the same rolling stands,
A plate speedometer, which is a plate speedometer installed on the output side of the final rolling stand,
Based on the entry-side plate thickness gauge, the entry-side plate speedometer, and the exit-side plate speedometer, the plate thickness of the metal strip on the exit side of the final rolling stand is estimated, and the estimated plate thickness is the output side plate thickness estimated value. , The error from the output side plate thickness measurement value which is the plate thickness measured by the output side plate thickness meter is calculated, and it is determined whether or not the error is within a predetermined threshold range, and the error is a predetermined value. A tandem cold rolling facility including a control unit configured to control the plate thickness of the cold rolling line based on the output side plate thickness measurement value when the plate thickness is within the threshold range.
最終圧延スタンドの圧延ライン上流側で測定された板厚である入側板厚測定値と、前記入側板厚測定値が測定された圧延スタンド間と同一の圧延スタンド間で測定された板速度である入側板速度測定値と、最終圧延スタンドの出側で測定された板速度である出側板速度測定値とに基づいて最終圧延スタンドの出側における金属帯板の板厚を推定し、
推定された板厚である出側板厚推定値と、前記出側板厚計で測定された板厚である出側板厚測定値との誤差を算出し、
前記誤差が所定の閾値の範囲内であるか否かの判定を行い、
前記誤差が所定の閾値の範囲内である場合に前記出側板厚測定値に基づいて冷間圧延ラインの板厚制御を実施する、タンデム式冷間圧延設備の板厚制御方法。 It is a plate thickness control method of a tandem type cold rolling equipment equipped with a plurality of rolling stands and a plate thickness gauge, which is a plate thickness gauge installed on the output side of the final rolling stand.
The plate thickness measured on the upstream side of the rolling line of the final rolling stand and the plate speed measured between the rolling stands where the input side plate thickness measurement value was measured and between the same rolling stands. The plate thickness of the metal strip on the exit side of the final rolling stand is estimated based on the input side plate speed measurement value and the exit side plate speed measurement value which is the plate speed measured on the exit side of the final rolling stand.
The error between the estimated output side plate thickness, which is the estimated plate thickness, and the output side plate thickness measurement value, which is the plate thickness measured by the output side plate thickness gauge, is calculated.
It is determined whether or not the error is within a predetermined threshold value.
A method for controlling a plate thickness of a tandem cold rolling facility, which controls the plate thickness of a cold rolling line based on the measured value of the output side plate thickness when the error is within a predetermined threshold value.
前記平均値と前記出側板厚測定値との誤差を算出し、
前記誤差が所定の閾値の範囲内であるか否かの判定を行い、
前記誤差が所定の閾値の範囲内である場合に前記出側板厚測定値に基づいて冷間圧延ラインの板厚制御を実施する、請求項３に記載のタンデム式冷間圧延設備の板厚制御方法。 The estimated value of the protruding side plate thickness is estimated periodically, and the average value of each estimated value of the protruding side plate thickness estimated periodically is calculated.
Calculate the error between the average value and the measured value of the protruding side plate thickness,
It is determined whether or not the error is within a predetermined threshold value.
The plate thickness control of the tandem type cold rolling equipment according to claim 3, wherein the plate thickness control of the cold rolling line is performed based on the output side plate thickness measurement value when the error is within a predetermined threshold value. Method.
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