JPH08141613A - Method for controlling thickness in hot rolling - Google Patents
Method for controlling thickness in hot rollingInfo
- Publication number
- JPH08141613A JPH08141613A JP6278112A JP27811294A JPH08141613A JP H08141613 A JPH08141613 A JP H08141613A JP 6278112 A JP6278112 A JP 6278112A JP 27811294 A JP27811294 A JP 27811294A JP H08141613 A JPH08141613 A JP H08141613A
- Authority
- JP
- Japan
- Prior art keywords
- plate thickness
- thickness
- stand
- roll gap
- meter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Control Of Metal Rolling (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は熱間圧延における板厚制
御方法に関するもので、特に板厚精度をより向上させる
ことが可能となる、熱間圧延における自動板厚制御方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip thickness control method in hot rolling, and more particularly to an automatic strip thickness control method in hot rolling which can further improve strip thickness accuracy.
【０００２】[0002]
【従来の技術】従来技術の一例として、特公平５−５５
２０５号公報によるものがあげられる。この技術は、ス
タンド間に一台以上の厚み計を設け、圧延材がこの厚み
計を通過した時点で、この厚み計で圧延材の板厚を実測
すると共に、この厚み計より上流のスタンドの圧延荷重
を実測し、実測した板厚と圧延荷重とから圧延材の変形
抵抗を算出し、予め圧延材の初期データに基づいて設定
しておいた板厚及び変形抵抗と、上記の実測板厚及び算
出変形抵抗とを対比し、それぞれの誤差値を分離して算
出し、これらの誤差値に基づいて上記の厚み計より下流
のスタンドのロールギャップとロール周速度の設定値を
修正するものである。2. Description of the Related Art As an example of prior art, Japanese Patent Publication No. 55-55
No. 205 publication is cited. In this technology, one or more thickness gauges are installed between stands, and when the rolled material passes through this thickness gauge, the thickness of the rolled material is measured by this thickness gauge, and the thickness of the stand upstream of this thickness gauge is measured. The rolling load is actually measured, the deformation resistance of the rolled material is calculated from the measured sheet thickness and rolling load, and the sheet thickness and deformation resistance set in advance based on the initial data of the rolled material and the above-mentioned measured sheet thickness The calculated deformation resistance is compared with each other, and the respective error values are calculated separately, and the set values of the roll gap and the roll peripheral speed of the stand downstream from the thickness gauge are corrected based on these error values. is there.
【０００３】[0003]
【発明が解決しようとする課題】前述の従来技術は、圧
延材の最頭部の板厚精度向上のための技術であり、有効
ではあるが変形抵抗推定誤差を演算する際には、予測の
変形抵抗値に誤差をもち、更に変形抵抗誤差が各スタン
ドで同比率とは限らず、又ロール偏心変動を含んだ圧延
荷重の瞬間値に近い局部の値を用いるため、正確さには
限界がある。又、ゲージメーター板厚と目標板厚をその
まま比較し、ゲージメーター板厚を目標板厚に一致させ
る様にする方法もあるが、ゲージメーター板厚の精度に
誤差が大きい場合に適用し難いという問題がある。The above-mentioned conventional technique is a technique for improving the sheet thickness accuracy of the top portion of the rolled material and is effective, but when calculating the deformation resistance estimation error, There is an error in the deformation resistance value, and the deformation resistance error is not always the same ratio in each stand.Because a local value close to the instantaneous value of rolling load including roll eccentricity fluctuation is used, accuracy is limited. is there. There is also a method of comparing the gauge meter plate thickness and the target plate thickness as they are and making the gauge meter plate thickness match the target plate thickness, but it is difficult to apply when there is a large error in the accuracy of the gauge meter plate thickness. There's a problem.
【０００４】[0004]
【課題を解決するための手段】本発明は、仮に従来技術
を適用し板厚偏差が残っても、さらに効果的に解決する
ものであって、圧延荷重検出値、ロールギャップ検出値
及びミル剛性係数等を用いてゲージメーター板厚を演算
し、該ゲージメーター板厚を目標板厚に制御する自動板
厚制御において、仕上圧延機のスタンド間に設置した板
厚検出器の信号と各スタンド出側の板速信号からマスフ
ロー板厚を演算し、該スタンド間板厚検出器より下流の
スタンドのゲージメーター板厚を該マスフロー板厚で補
正し、補正済のゲージメーター板厚を目標板厚に一致さ
せるようロールギャップを制御することを特徴とする熱
間圧延における板厚制御方法である。SUMMARY OF THE INVENTION The present invention is to solve the problem even more effectively even if the sheet thickness deviation remains by applying the conventional technique. The rolling load detection value, roll gap detection value and mill rigidity In the automatic plate thickness control that calculates the gauge meter plate thickness using the coefficient and controls the gauge meter plate thickness to the target plate thickness, the signal of the plate thickness detector installed between the stands of the finishing rolling mill and the output of each stand. Calculate the mass flow plate thickness from the plate speed signal on the side, correct the gauge meter plate thickness of the stand downstream from the inter-stand plate thickness detector with the mass flow plate thickness, and set the corrected gauge meter plate thickness to the target plate thickness. It is a strip thickness control method in hot rolling, characterized in that the roll gap is controlled so as to match.
【０００５】以下、図面に基づいて本発明を説明する。
図１は本発明に係る実施例を説明するためのシステム構
成図である。図１において熱間圧延機群は４重のロール
を備えた７基のスタンドを有する鋼板の連続圧延機であ
って、圧延材１は直接圧延されるワークロール及びワー
クロールに接してこれを補強するバックアップロールよ
り構成される。これらの構成のもとにロールギャップ制
御機構２で、ロールギャップが演算器６により算出され
た値となるように、ロールギャップの制御を行う。ま
た、ロール回転数制御機構３で、演算器６により算出さ
れたロール周速となるように、モーター回転数の制御を
行う。（所定の張力を与え、ループを吸収するためのロ
ール周速補正を含む。）The present invention will be described below with reference to the drawings.
FIG. 1 is a system configuration diagram for explaining an embodiment according to the present invention. In FIG. 1, the hot rolling mill group is a continuous rolling mill for steel plates having seven stands with quadruple rolls, and a rolled material 1 directly contacts a work roll and a work roll to reinforce the work roll. Backup role. Based on these configurations, the roll gap control mechanism 2 controls the roll gap so that the roll gap becomes the value calculated by the calculator 6. Further, the roll rotation speed control mechanism 3 controls the motor rotation speed so that the roll peripheral speed calculated by the calculator 6 is obtained. (Including roll peripheral speed correction to give a predetermined tension and absorb the loop.)
【０００６】符号４は圧延荷重検出器で、ロールが圧延
材に与える荷重の測定を一定周期で行うものである。５
はスタンド間板厚検出器で、圧延材の全長にわたり、一
定周期で板厚の測定を行う。また、前述した演算器６に
おいては、圧延荷重検出値、ロールギャップ検出値及び
ミル剛性係数等を用いてゲージメーター板厚を演算する
と同時に、スタンド間板厚検出値と各スタンド板速信号
からマスフロー板厚を演算し、該スタンド間板厚検出器
より下流のスタンドのゲージメーター板厚を該マスフロ
ー板厚で補正し、補正済の各スタンド出側のゲージメー
ター板厚を各スタンド目標板厚に一致させるようにロー
ルギャップの出力をロールギャップ制御機構２に与え
る。図２は制御機構に与えるロールギャップ出力の制御
ブロック図の概略を示す図である。ここで、図２（Ａ）
は本発明の制御ブロック図であり、図２（Ｂ）及び図２
（Ｃ）は従来の制御ブロック図を示す。Reference numeral 4 is a rolling load detector, which measures the load applied to the rolled material by the roll at a constant cycle. 5
Is a plate thickness detector between stands, which measures the plate thickness at a constant cycle over the entire length of the rolled material. Further, in the above-mentioned computing unit 6, the gauge load plate thickness is calculated by using the rolling load detection value, the roll gap detection value, the mill rigidity coefficient, etc., and at the same time, the mass flow is calculated from the stand stand thickness detection value and each stand plate speed signal. The plate thickness is calculated, the gauge meter plate thickness of the stand downstream from the inter-stand plate thickness detector is corrected by the mass flow plate thickness, and the corrected gauge meter plate thickness of each stand is set as the target plate thickness of each stand. The output of the roll gap is given to the roll gap control mechanism 2 so as to match. FIG. 2 is a diagram showing an outline of a control block diagram of the roll gap output given to the control mechanism. Here, FIG. 2 (A)
2 is a control block diagram of the present invention, which is shown in FIG.
(C) shows a conventional control block diagram.
【０００７】本発明の特徴とするところは、演算器６で
演算に使用する前述のマスフロー板厚の演算を、検出器
より下流のスタンドにおいてスタンド間板厚検出器５の
測定値及び各スタンド出側の板速信号を基に全長にわた
り行うことである。下記の制御補正量Δｈは、このマス
フロー板厚が実測値に近ければ近いほど正確な値となる
ため、板厚精度をより向上させることが可能となる。The feature of the present invention resides in that the above-described calculation of the mass flow plate thickness used in the calculation by the calculator 6 is performed by the measured value of the plate thickness detector 5 between stands and the output from each stand at the stand downstream from the detector. Is performed over the entire length based on the plate speed signal on the side. The following control correction amount Δh becomes a more accurate value as this mass flow plate thickness is closer to the actual measurement value, so that it is possible to further improve the plate thickness accuracy.
【０００８】本発明は以下（１）〜（６）の手段によっ
て行われる。 （１）連続する圧延機のスタンド間に、１台以上、（ス
タンド数−１）台以下の板厚検出器を設置する。 （２）圧延材の各スタンドにおけるロールギャップ、圧
延荷重を一定周期で実測し、その各々のタイミングでそ
の実測値を基に各スタンドの下記式で表されるいわゆ
るゲージメーター板厚ｈGMi を算出する。 ｈGMi ＝Ｓｉ＋Ｐi ／Ｍi ＋α1 Ｐi ＋α2 Ｆi ＋α3 ＋Ｏili ＋ΔｈGMi ・・・・ Ｓi ：ロール間隔 Ｐi ：圧延荷重 Ｍi ：ミル剛性 Ｆi ：ベンダー力 α1,α2,α3 ：定数 Ｏili : ロール表面の油膜厚み ΔｈGMi : その他補正項The present invention is carried out by the following means (1) to (6). (1) One or more and (the number of stands-1) or less plate thickness detectors are installed between the stands of continuous rolling mills. (2) The roll gap and rolling load of each stand of the rolled material are measured in a constant cycle, and the so-called gauge meter plate thickness h GMi of each stand is calculated based on the measured values at each timing. To do. h GMi = Si + P i / M i + α 1 P i + α 2 F i + α 3 + Oil i + Δh GMi ··· S i : Roll spacing P i : Rolling load M i : Mill rigidity F i : Bender force α 1 , α 2 , α 3 : Constant Oil i : Oil film thickness on roll surface Δh GMi : Other correction terms
【０００９】（３）上記（２）実測と同タイミングで、
スタンド間板厚検出器の板厚実測値、各スタンドの出側
板速を基に、各スタンドの下記式で表されるいわゆ
る、マスフロー板厚ｈMFi を算出する。いわゆる、マス
フロー板厚ｈMFi を算出する。 ｈMFi ＝ｈi-1 Ｖi-1 Ｂi-1 ／（Ｖi Ｂi ） ＝ｈi+1 Ｖi+1 Ｂi+1 ／（Ｖi Ｂi ） ・・・・ Ｖi ：ｉスタンド出側板速 Ｂi ：圧延材のｉスタンド出側板幅 但し、ｉスタンド出側板速Ｖi は実測又はロール周速か
ら先進率で補正する。ｉスタンド出側板幅Ｂi は、予測
板幅を使用する。更なる正確を期するためには実測板幅
が好ましい。 （４）上記（２）で算出したゲージメーター板厚ｈGMi
と上記（３）で算出したマスフロー板厚ｈMFi との差を
板厚制御補正量Δｈi とする。(3) At the same timing as the above (2) actual measurement,
The so-called mass flow plate thickness h MFi represented by the following formula of each stand is calculated based on the plate thickness actual measurement value of the inter-stand plate thickness detector and the exit side plate speed of each stand. The so-called mass flow plate thickness h MFi is calculated. h MFi = h i-1 V i-1 B i-1 / (V i B i ) = h i + 1 V i + 1 B i + 1 / (V i B i ) ... V i : i Stand output side plate speed B i : i stand output side plate width of the rolled material However, the i stand output side plate speed V i is measured or corrected from the roll peripheral speed by an advanced rate. The predicted stand width is used for the i stand stand-out side width B i . The measured plate width is preferable for further accuracy. (4) Gauge meter plate thickness h GMi calculated in (2) above
The difference between the mass flow plate thickness h MFi calculated in (3) and the plate thickness control correction amount Δh i .
【００１０】（５）次に上記（４）で求めたΔｈi は、
スタンド間板厚検出器より下流のスタンドにおいて、圧
延材の頭部通過時より逐次演算でき、ゲージメーターＡ
ＧＣ（自動板厚制御）のゲージメーター板厚を開始した
いタイミングで平均値処理等を行う。例えば、ゲージメ
ーターＡＧＣ開始を頭部通過１．０［ｓｅｃ］後とする
と、頭部通過０．５［ｓｅｃ］より１．０［ｓｅｃ］間
の平均値を使用し、Δｈi を求める。仮に、演算周期を
０．１［ｓｅｃ］とすると、(5) Next, Δh i obtained in (4) above is
In the stand downstream of the inter-stand plate thickness detector, it is possible to calculate sequentially from the time when the rolled material passes through the head.
Average value processing is performed at the timing when the gauge meter plate of GC (automatic plate thickness control) is to be started. For example, assuming that the start of the gauge meter AGC is 1.0 [sec] after the head has passed, Δh i is calculated using the average value from 0.5 [sec] to 1.0 [sec]. If the calculation cycle is 0.1 [sec],
【００１１】[0011]
【化１】 Embedded image
【００１２】（６）頭部通過１．０［ｓｅｃ］後以降は
ゲージメーター板厚ｈGMi ｈGMi ＝ｈGMi ＋Δｈi ・・・・・・・ とし、そのスタンドの目標板厚と比較し、その差分を０
にするように図２の制御系で板厚制御を行う。図３は本
発明による最終スタンド出側板厚偏差のチャート例を示
す図であり、図４は従来法による最終スタンド出側板厚
偏差のチャート例である。この図３及び図４に示す通
り、図４に比較して図３は頭部の板厚精度が大幅に向上
していることが判る。(6) After 1.0 [sec] after the head has passed, the gauge meter plate thickness h GMi h GMi = h GMi + Δh i ... The difference is 0
The plate thickness is controlled by the control system shown in FIG. FIG. 3 is a diagram showing an example of a chart of the final stand outlet side plate thickness deviation, and FIG. 4 is an example of a final stand outlet side plate thickness deviation according to the conventional method. As shown in FIGS. 3 and 4, it can be seen that the plate thickness accuracy of the head is significantly improved in FIG. 3 as compared with FIG.
【００１３】[0013]
【発明の効果】以上述べたように、本発明によって、ゲ
ージメーター板厚をより精度良く算出する事が出来、圧
延材の全長にわたり制御を行う事が可能となる。これに
より、圧延材の全長にわたる板厚精度が向上されるとい
う効果を奏する。また、圧延機入側のストリップ位置制
御を従来方法の約３０％にまで減少させることができ
た。As described above, according to the present invention, the gauge meter plate thickness can be calculated more accurately, and control can be performed over the entire length of the rolled material. As a result, there is an effect that the plate thickness accuracy over the entire length of the rolled material is improved. Further, the strip position control on the inlet side of the rolling mill could be reduced to about 30% of the conventional method.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明に係る実施例を説明するためのシステム
構成図、FIG. 1 is a system configuration diagram for explaining an embodiment according to the present invention,
【図２】制御機構に与えるロールギャップ出力の制御ブ
ロック図の概略を示す図、FIG. 2 is a diagram schematically showing a control block diagram of a roll gap output given to a control mechanism,
【図３】本発明による最終スタンド出側板厚偏差のチャ
ート例を示す図、FIG. 3 is a diagram showing an example of a chart of the deviation of plate thickness on the delivery side of the final stand according to the present invention;
【図４】従来法による最終スタンド出側板厚偏差のチャ
ート例を示す図である。FIG. 4 is a diagram showing an example of a chart of the deviation of the plate thickness at the delivery side of the final stand according to the conventional method.
１ 圧延材 ２ ロールギャップ制御機構 ３ ロール回転数制御機構 ４ 圧延荷重検出器 ５ スタンド間板厚検出器 ６ 演算器 1 Rolled material 2 Roll gap control mechanism 3 Roll rotation speed control mechanism 4 Rolling load detector 5 Inter-stand plate thickness detector 6 Computing unit
Claims (1)
ールギャップ検出値及びミル剛性係数等を用いてゲージ
メーター板厚を演算し、ゲージメーター板厚を目標板厚
に制御する自動板厚制御において、仕上圧延機のスタン
ド間に設置した板厚検出器の信号と各スタンド出側の板
速信号からマスフロー板厚を演算し、該スタンド間板厚
検出器より下流のスタンドのゲージメーター板厚を該マ
スフロー板厚で補正し、補正済のゲージメーター板厚を
目標板厚に一致させるようロールギャップを制御するこ
とを特徴とする熱間圧延における板厚制御方法。1. An automatic plate thickness control for controlling a gauge meter plate thickness to a target plate thickness by calculating a gauge meter plate thickness using a rolling load detection value, a roll gap detection value, a mill rigidity coefficient and the like measured at a constant cycle. In, the mass flow plate thickness is calculated from the signal of the plate thickness detector installed between the stands of the finishing rolling mill and the plate speed signal on the output side of each stand, and the gauge meter plate thickness of the stand downstream from the inter-stand plate thickness detector. Is controlled by the mass flow plate thickness, and the roll gap is controlled so that the corrected gauge meter plate thickness matches the target plate thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6278112A JP3062017B2 (en) | 1994-11-11 | 1994-11-11 | Thickness control method in hot rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6278112A JP3062017B2 (en) | 1994-11-11 | 1994-11-11 | Thickness control method in hot rolling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08141613A true JPH08141613A (en) | 1996-06-04 |
| JP3062017B2 JP3062017B2 (en) | 2000-07-10 |
Family
ID=17592797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6278112A Expired - Lifetime JP3062017B2 (en) | 1994-11-11 | 1994-11-11 | Thickness control method in hot rolling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3062017B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008011275A1 (en) * | 2008-02-27 | 2009-09-10 | Siemens Aktiengesellschaft | Operating procedure for a multi-stand rolling mill with strip thickness determination using the continuity equation |
| CN103252353A (en) * | 2013-04-26 | 2013-08-21 | 江苏省沙钢钢铁研究院有限公司 | Control method for head-tail thickness out-of-tolerance of wide and thick plate rolling mill |
| CN104741388A (en) * | 2015-04-15 | 2015-07-01 | 东北大学 | Method for controlling fine rolling thickness of hot continuous rolling |
-
1994
- 1994-11-11 JP JP6278112A patent/JP3062017B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008011275A1 (en) * | 2008-02-27 | 2009-09-10 | Siemens Aktiengesellschaft | Operating procedure for a multi-stand rolling mill with strip thickness determination using the continuity equation |
| US8186195B2 (en) | 2008-02-27 | 2012-05-29 | Siemens Aktiengesellschaft | Operating method for a multi-stand rolling mill train with strip thickness determination on the basis of the continuity equation |
| CN103252353A (en) * | 2013-04-26 | 2013-08-21 | 江苏省沙钢钢铁研究院有限公司 | Control method for head-tail thickness out-of-tolerance of wide and thick plate rolling mill |
| CN104741388A (en) * | 2015-04-15 | 2015-07-01 | 东北大学 | Method for controlling fine rolling thickness of hot continuous rolling |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3062017B2 (en) | 2000-07-10 |
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