JPH0739914A - Method for controlling plate thickness of hot rolling mill - Google Patents

Method for controlling plate thickness of hot rolling mill

Info

Publication number
JPH0739914A
JPH0739914A JP5186104A JP18610493A JPH0739914A JP H0739914 A JPH0739914 A JP H0739914A JP 5186104 A JP5186104 A JP 5186104A JP 18610493 A JP18610493 A JP 18610493A JP H0739914 A JPH0739914 A JP H0739914A
Authority
JP
Japan
Prior art keywords
thickness
plate thickness
rolling mill
hot rolling
control
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
Application number
JP5186104A
Other languages
Japanese (ja)
Other versions
JP2760937B2 (en
Inventor
Toshiaki Kawashima
俊明 川島
Isamu Okamura
勇 岡村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP5186104A priority Critical patent/JP2760937B2/en
Publication of JPH0739914A publication Critical patent/JPH0739914A/en
Application granted granted Critical
Publication of JP2760937B2 publication Critical patent/JP2760937B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Control Of Metal Rolling (AREA)

Abstract

PURPOSE:To provide a plate thickness control method of a hot rolling mill which can approach to an objective plate thickness and restrain its variation. CONSTITUTION:When the plate thickness is set to an objective thickness by controlling rolling reduction so that a plate thickness measured by a thickness meter provided on the outlet side of a hot rolling mill is fed back to remove the deviation from the objective plate thickness, a roll gap is corrected by feed back control in accordance with an average thickness of the tip part of a stock to be rolled through an initial rolling-down corrective control system 9. Then, PI compensation is made according to a measured thickness fed back by a corrective rolling-down corrective control system 10 at every sampling time of the thickness meter to correct the roll gap. Consequently, the plate thickness on the outlet side can be approached quickly to the objective thickness and its variation be restrained.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は熱間圧延機の板厚制御方
法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip thickness control method for a hot rolling mill.

【0002】[0002]

【従来の技術】通常の熱間板圧延においては、被圧延材
の長手方向の板厚分布を小さくし、圧延機出側板厚を目
標の狙い厚に近づけるために、自動板厚制御(以下、A
GCと称する)が導入されている。このAGCとして
は、ロックオン方式のゲージメータAGCが用いられる
のが一般的である(たとえば、特開平2− 11205号公報
参照)。
2. Description of the Related Art In ordinary hot strip rolling, automatic strip thickness control (hereinafter, referred to as "plate thickness distribution" in order to reduce the strip thickness distribution in the longitudinal direction of the material to be rolled and bring the strip thickness on the delivery side of the rolling mill to a target thickness. A
(Referred to as GC) has been introduced. As this AGC, a lock-on type gauge meter AGC is generally used (see, for example, Japanese Patent Laid-Open No. 2-11205).

【0003】このゲージメータAGCでは、圧延機のミ
ル定数、圧延材の変形抵抗等の予測精度(いわゆるゲー
ジメータ精度)が十分でないため、出側板厚の平均厚と
狙い厚とに誤差を生じるとか、スキッドマークによる長
手方向での変形抵抗の変動などにより、出側板厚の変動
が残ってしまうなどの問題がある。そこで、ゲージメー
タ誤差により生じる圧延機出側板厚と狙い厚との誤差を
補正するために、厚み計で測定した実測厚hと狙い厚h
aim との差Δhを油圧圧下装置にフィードバックし、ロ
ールギャップを補正(圧下補正)して狙い厚へ近づける
モニターAGCが行われている。
In this gauge meter AGC, the mill constant of the rolling mill, the predictive accuracy of the deformation resistance of the rolled material (so-called gauge meter accuracy) is not sufficient, so that an error occurs between the average thickness of the outlet side plate and the target thickness. However, there is a problem that the variation of the deformation resistance in the longitudinal direction due to the skid marks causes the variation of the delivery side plate thickness to remain. Therefore, in order to correct the error between the rolling mill exit side plate thickness and the target thickness caused by the gauge meter error, the measured thickness h measured by the thickness gauge and the target thickness h
The monitor AGC is performed to feed back the difference Δh from the aim to the hydraulic pressure reduction device and correct the roll gap (correction reduction) to bring the target thickness closer to the target thickness.

【0004】従来のモニターAGCは厚み計のサンプリ
ング時間ごとに実測厚hをフィードバックし、狙い厚h
aim との差を0とするようにPI(比例−積分)制御を
行うものである。
In the conventional monitor AGC, the measured thickness h is fed back at every sampling time of the thickness gauge to obtain the target thickness h.
PI (proportional-integral) control is performed so that the difference from the aim is zero.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、上記し
たPI制御によるモニターAGCには次のような問題が
ある。すなわち、圧延機と厚み計との間の距離に起因す
る無駄時間により出側板厚と圧下補正量に位相のずれを
生じるため、早く狙い厚に近づけるために制御ゲインを
上げると、図6の実線で示すようにもともとの板厚変動
を増大させてしまい、狙い厚付近での出側板厚の変動が
大きくなる。一方、制御ゲインを下げると同図の点線で
示すように狙い厚付近での出側板厚の変動は抑えられる
が、狙い厚に近づくのが遅くなってしまう。なお、図
中、T1 はモニターAGCの制御開始時間である。この
ように、従来のPI制御によるモニターAGCでは、狙
い厚と板厚変動の両方を満足することは困難である。
However, the monitor AGC by the PI control described above has the following problems. That is, since the output side plate thickness and the reduction correction amount are out of phase due to the dead time caused by the distance between the rolling mill and the thickness gauge, if the control gain is increased to quickly approach the target thickness, the solid line in FIG. As shown in (3), the original plate thickness variation is increased, and the variation of the delivery side plate thickness near the target thickness becomes large. On the other hand, if the control gain is lowered, the variation of the delivery side plate thickness near the target thickness is suppressed as shown by the dotted line in the figure, but the target thickness becomes slower to approach. In the figure, T 1 is the control start time of the monitor AGC. As described above, it is difficult for the conventional monitor AGC by PI control to satisfy both the target thickness and the plate thickness variation.

【0006】本発明は、上記のような従来技術の有する
課題を解決すべくなされたものであって、早く狙い厚に
近づけるとともに狙い厚付近での出側板厚変動を抑制す
ることの可能な熱間圧延機の板厚制御方法を提供するこ
とを目的とする。
The present invention has been made to solve the above-mentioned problems of the prior art, and is capable of quickly approaching the target thickness and suppressing fluctuations in the outlet plate thickness near the target thickness. An object of the present invention is to provide a strip thickness control method for a hot rolling mill.

【0007】[0007]

【課題を解決するための手段】本発明は、圧延機出側に
設置した厚み計で測定された板厚をフィードバックして
目標板厚との偏差を0にするように圧下量を制御する熱
間圧延機の板厚制御方法において、被圧延材の板先端部
の平均厚に基づいてフィードバック制御によってロール
ギャップを補正する工程と、厚み計のサンプリング時間
ごとにフィードバックされる実測厚に基づいてPI補償
を施してフィードバック制御によってロールギャップを
補正する工程と、を組み合わせたことを特徴とする熱間
圧延機の板厚制御方法である。
SUMMARY OF THE INVENTION The present invention is a heat control system that controls the amount of reduction so that the deviation from the target thickness becomes zero by feeding back the thickness measured by a thickness gauge installed on the delivery side of the rolling mill. In the method of controlling the plate thickness of a hot rolling mill, a PI process is performed based on the process of correcting the roll gap by feedback control based on the average thickness of the plate tip of the material to be rolled, and the measured thickness fed back at each sampling time of the thickness gauge. And a step of compensating and correcting the roll gap by feedback control.

【0008】[0008]

【作 用】本発明によれば、板先端部の平均厚に基づい
てフィードバック制御する初期圧下補正制御系と、厚み
計のサンプリング時間ごとにフィードバックされる実測
厚に基づいてPI補償を施してフィードバック制御する
補正圧下補正制御系とを並列にもつようにしたので、出
側板厚を早く狙い厚に近づけ、かつその変動を抑制する
ことができる。
[Operation] According to the present invention, an initial reduction correction control system that performs feedback control based on the average thickness of the plate front end, and PI compensation based on the measured thickness that is fed back at each sampling time of the thickness gauge are fed back. Since the correction reduction correction control system to be controlled is provided in parallel, it is possible to quickly bring the delivery side plate thickness closer to the target thickness and suppress the fluctuation thereof.

【0009】[0009]

【実施例】以下、本発明の実施例について図面を参照し
て詳しく説明する。図1は本発明の実施例を示す概要図
である。図において、1は熱間圧延機で、被圧延材2を
挟んで対向する上下一対のワークロール3a,3bと、
これらに転接する上下一対のバックアップロール4a,
4bとを備えており、下部バックアップロール4bの圧
下量が油圧シリンダ5によって制御される。
Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing an embodiment of the present invention. In the figure, 1 is a hot rolling mill, which is a pair of upper and lower work rolls 3a and 3b facing each other with a material 2 to be rolled therebetween,
A pair of upper and lower backup rolls 4a rolling on these,
4b, and the amount of reduction of the lower backup roll 4b is controlled by the hydraulic cylinder 5.

【0010】6は熱間圧延機1の出側に取付けられて被
圧延材2の板厚を測定するたとえばγ線厚さ計などの板
厚計で、7はこの板厚計6からの被圧延材2の板厚検出
値hを入力するコントローラであり、その演算結果は油
圧シリンダ5を制御する油圧圧下制御装置8に出力され
る。コントローラ7は、図2のブロック線図に示すよう
に、初期の板先端部の板厚に基づいてロールギャップを
フィードバック制御する初期圧下補正制御系9と、板厚
計6のサンプリング時間ごとにフィードバックされる実
測厚に基づいてロールギャップをフィードバック制御す
る補正圧下補正制御系10との並列な2つのフィードバッ
ク制御系により構成される。このコントローラ7によっ
て2つの並列な制御系9,10より出力されたロールギャ
ップ補正量(ΔS1 +ΔS2 )は油圧圧下制御装置8に
送られ、油圧シリンダ5を動かしてロールギャップを制
御する。
Reference numeral 6 is a plate thickness gauge, such as a gamma ray thickness gauge, which is attached to the outlet side of the hot rolling mill 1 and measures the plate thickness of the material 2 to be rolled. The controller is a controller for inputting the plate thickness detection value h of the rolled material 2, and the calculation result is output to the hydraulic pressure reduction control device 8 which controls the hydraulic cylinder 5. As shown in the block diagram of FIG. 2, the controller 7 feedbacks the initial roll-down correction control system 9 that feedback-controls the roll gap based on the initial plate thickness of the plate tip portion, and feedbacks at every sampling time of the plate thickness gauge 6. It is constituted by two feedback control systems in parallel with a correction reduction correction control system 10 which feedback-controls the roll gap based on the measured thickness. The roll gap correction amount (ΔS 1 + ΔS 2 ) output from the two parallel control systems 9 and 10 by the controller 7 is sent to the hydraulic pressure reduction controller 8 to move the hydraulic cylinder 5 to control the roll gap.

【0011】このように構成されたコントローラ7にお
いて、初期圧下補正制御系9では、まず、サンプリング
時間tごとに板厚計6で測定されたサンプリング点の板
先端部の板厚hを平均厚演算回路11に入力して、その数
点の平均厚h* を演算する。その後、狙い厚haim との
偏差Δh1 を算出(図3(a) )して、この偏差Δh1
ロールギャップ補正量ΔS1 (図3(b) )として速やか
に出力して、フィードバック制御によりロールギャップ
の補正を行う。この初期圧下補正量とされるロールギャ
ップ補正量ΔS1 は出力後において被圧延材2がワーク
ロール3を噛み抜けるまでホールドされ、これにより出
側板厚hは早く狙い厚に近づくことになる。
In the controller 7 thus constructed, the initial reduction correction control system 9 first calculates the average thickness of the plate thickness h of the plate tip portion at the sampling point measured by the plate thickness meter 6 at each sampling time t. It is input to the circuit 11 and the average thickness h * of the several points is calculated. After that, the deviation Δh 1 from the target thickness h aim is calculated (FIG. 3 (a)), and this deviation Δh 1 is promptly output as the roll gap correction amount ΔS 1 (FIG. 3 (b)) for feedback control. The roll gap is corrected by. After the output, the roll gap correction amount ΔS 1 which is the initial reduction correction amount is held until the rolled material 2 bites through the work roll 3, whereby the delivery side plate thickness h quickly approaches the target thickness.

【0012】なお、この板先端部の平均厚h* は板全長
の平均厚h**とは異なるため、初期圧下補正制御系9か
らの出力ΔS1 だけでは出側板厚と狙い厚とに誤差を生
じることになる。そこで、補正圧下補正制御系10は板先
端部平均厚h* と板全長の平均厚h**との誤差を補正す
るために必要な機能であり、これによって補正圧下補正
量ΔS2 により狙い厚精度が向上する。
Since the average thickness h * of the tip of the plate is different from the average thickness h ** of the entire plate length, the output ΔS 1 from the initial reduction correction control system 9 alone causes an error between the output side plate thickness and the target thickness. Will occur. Therefore, the correction reduction correction control system 10 is a function necessary to correct the error between the average thickness h * of the plate front end portion and the average thickness h ** of the entire plate length, whereby the target thickness is adjusted by the correction reduction correction amount ΔS 2. Accuracy is improved.

【0013】すなわち、補正圧下補正制御系10において
は、サンプリング時間tごとに板厚計6によってフィー
ドバックされる実測厚hと狙い厚haim の偏差Δh2
算出(図4(a) )してPI演算回路12においてPI補償
を施し、その補正圧下補正量としてのロールギャップ補
正量ΔS2 (図4(b) )を初期圧下補正量ΔS1 の出力
後に出力する(図4(c) )。
That is, in the correction reduction correction control system 10, the deviation Δh 2 between the measured thickness h fed back by the plate thickness gauge 6 and the target thickness h aim is calculated for each sampling time t (FIG. 4 (a)). PI compensation is performed in the PI calculation circuit 12, and a roll gap correction amount ΔS 2 (FIG. 4 (b)) as the correction reduction correction amount is output after the initial reduction correction amount ΔS 1 is output (FIG. 4 (c)).

【0014】これによって、初期圧下補正量ΔS1 によ
って出側板厚が狙い厚に近づいているので、補正圧下補
正制御系10でのPI制御の制御ゲインは従来のPI制御
によるモニターAGCの制御ゲインより小さくすること
ができ、狙い厚付近での出側板厚の変動を抑制すること
が可能となる。図5は、本発明のPI制御によるモニタ
ーAGCを適用したときの出側板厚の推移を示したもの
である。時間T1 においてロールギャップ補正量ΔS1
を出力して初期圧下補正を開始し、時間T2 でロールギ
ャップ補正量ΔS2 を出力してPI制御による圧下補正
を開始したところ、狙い厚精度が向上した。
As a result, since the exit side plate thickness approaches the target thickness by the initial reduction correction amount ΔS 1 , the control gain of the PI control in the correction reduction correction control system 10 is more than the control gain of the monitor AGC by the conventional PI control. It is possible to reduce the thickness, and it is possible to suppress the variation of the outlet plate thickness near the target thickness. FIG. 5 shows the transition of the outgoing side plate thickness when the monitor AGC by PI control of the present invention is applied. Roll gap correction amount ΔS 1 at time T 1
Is output to start the initial reduction correction, and the roll gap correction amount ΔS 2 is output at time T 2 to start the reduction correction by PI control, and the target thickness accuracy is improved.

【0015】[0015]

【発明の効果】以上説明したように、本発明によれば、
板先端部の平均厚に基づいてフィードバック制御する初
期圧下補正制御系と厚み計のサンプリング時間ごとにフ
ィードバックされる実測厚に基づいてPI補償してフィ
ードバック制御する補正圧下補正制御系とを並列にもつ
ようにしたので、出側板厚を早く狙い厚に近づけ、かつ
その変動を抑制することができ、これによって製品の板
厚精度を向上させることができる。
As described above, according to the present invention,
An initial reduction correction control system that performs feedback control based on the average thickness of the plate front end and a correction reduction correction control system that performs PI compensation and feedback control based on the measured thickness fed back at each sampling time of the thickness gauge are provided in parallel. As a result, the delivery side plate thickness can be quickly brought close to the target thickness, and its fluctuation can be suppressed, whereby the plate thickness accuracy of the product can be improved.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施例を示す概要図である。FIG. 1 is a schematic diagram showing an embodiment of the present invention.

【図2】本発明に用いられるコントローラのブロック線
図である。
FIG. 2 is a block diagram of a controller used in the present invention.

【図3】初期圧下補正制御系の動作の説明図である。FIG. 3 is an explanatory diagram of an operation of an initial reduction correction control system.

【図4】補正圧下補正制御系の動作の説明図である。FIG. 4 is an explanatory diagram of an operation of a correction reduction correction control system.

【図5】本発明法によって制御された出側板厚の推移を
示す特性図である。
FIG. 5 is a characteristic diagram showing changes in the outlet plate thickness controlled by the method of the present invention.

【図6】従来法によって制御された出側板厚の推移を示
す特性図である。
FIG. 6 is a characteristic diagram showing changes in the outlet plate thickness controlled by a conventional method.

【符号の説明】[Explanation of symbols]

1 熱間圧延機 2 被圧延材 3 ワークロール 4 バックアップロール 5 油圧シリンダ 6 板厚計 7 コントローラ 8 油圧圧下制御装置 9 初期圧下補正制御系 10 補正圧下補正制御系 11 平均厚演算回路 12 PI演算回路 1 Hot Rolling Mill 2 Work Roll 3 Work Roll 4 Backup Roll 5 Hydraulic Cylinder 6 Plate Thickness Gauge 7 Controller 8 Hydraulic Reduction Controller 9 Initial Reduction Correction Control System 10 Corrected Reduction Correction Control System 11 Average Thickness Calculation Circuit 12 PI Calculation Circuit

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 圧延機出側に設置した厚み計で測定さ
れた板厚をフィードバックして目標板厚との偏差を0に
するように圧下量を制御する熱間圧延機の板厚制御方法
において、被圧延材の板先端部の平均厚に基づいてフィ
ードバック制御によってロールギャップを補正する工程
と、厚み計のサンプリング時間ごとにフィードバックさ
れる実測厚に基づいてPI補償を施してフィードバック
制御によってロールギャップを補正する工程と、を組み
合わせたことを特徴とする熱間圧延機の板厚制御方法。
1. A plate thickness control method for a hot rolling mill, which feeds back the plate thickness measured by a thickness gauge installed on the delivery side of the rolling mill to control the reduction amount so that the deviation from the target plate thickness becomes zero. In the above, in the step of correcting the roll gap by feedback control based on the average thickness of the plate front end portion of the rolled material, and by performing PI compensation based on the measured thickness fed back at each sampling time of the thickness gauge, and performing roll control by feedback control. A plate thickness control method for a hot rolling mill, characterized by combining a step of correcting a gap.
JP5186104A 1993-07-28 1993-07-28 Hot roll mill thickness control method Expired - Fee Related JP2760937B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5186104A JP2760937B2 (en) 1993-07-28 1993-07-28 Hot roll mill thickness control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5186104A JP2760937B2 (en) 1993-07-28 1993-07-28 Hot roll mill thickness control method

Publications (2)

Publication Number Publication Date
JPH0739914A true JPH0739914A (en) 1995-02-10
JP2760937B2 JP2760937B2 (en) 1998-06-04

Family

ID=16182436

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5186104A Expired - Fee Related JP2760937B2 (en) 1993-07-28 1993-07-28 Hot roll mill thickness control method

Country Status (1)

Country Link
JP (1) JP2760937B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09290118A (en) * 1996-04-26 1997-11-11 Maeda:Kk Filter for compressed air

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09290118A (en) * 1996-04-26 1997-11-11 Maeda:Kk Filter for compressed air

Also Published As

Publication number Publication date
JP2760937B2 (en) 1998-06-04

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LAPS Cancellation because of no payment of annual fees