JP3604626B2 - Apparatus for controlling foil shape in foil rolling mill and method for controlling such foil shape - Google Patents

Description

〔但し、ｉ：検出された形状偏差の近似次数
ｗ：アルミ箔の幅
ｘ：幅方向位置
ｔ：時刻
τ：形状検出装置の検出遅れ
ｆ（ｘ，ｔ−τ）：形状検出装置の配設位置での幅方向箔形状分布の目標値からの偏差
Ｊ_ｉ（ｘ）：任意の互いに異なる関数〕
【００４２】
次いで、演算部３８で算出された８個の形状パラメータ：ΔΛ_ｓ１〜ΔΛ_ｓ８の中から、アルミ箔２８を箔圧延する際の圧延条件、例えば、アルミ箔２８を与えるアルミ板材３４の板厚や板幅、材質等に応じて、ワークロールベンディング力調整装置１８、ワークロールベンディング差力調整装置２０、圧下レベリング調整装置２２、及びＶＣロール油圧調整装置２４の四つの形状制御用アクチュエータで制御するのに最適な形状パラメータを、選択部４０において、各形状制御用アクチュエータ１８〜２４毎に、それぞれ一つずつ選択する。
【００４３】
ここでの形状パラメータの選択方法も、特に限定されるものではなく、例えば、様々な圧延条件に応じた、前記四つの形状制御用アクチュエータ１８〜２４のそれぞれのものの単位操作量当たりにおける各形状パラメータ：ΔΛ_ｓ１〜ΔΛ_ｓ８の変化量を、種々の実験や試験等により、各形状パラメータ：ΔΛ_ｓ１〜ΔΛ_ｓ８毎に予め測定しておき、その上で、実際に行なわれるアルミ箔２８の箔圧延の圧延条件において、形状制御用アクチュエータ１８〜２４の単位操作量当たりにおける変化量が大きく、アルミ箔２８の箔形状の制御に大きな影響を及ぼす形状パラメータ：ΔΛ_ｓ１〜ΔΛ_ｓ８を、各形状制御用アクチュエータ１８〜２４毎に選択する方法や、或いは様々な圧延条件に応じた各形状制御用アクチュエータ１８〜２４の特性を予め把握しておき、その上で、アルミ箔圧延の実施時の圧延条件に応じて、特性が十分に発揮され得る形状制御用アクチュエータ１８〜２４で有効に制御可能な形状パラメータ：ΔΛ_ｓ１〜ΔΛ_ｓ８を、各形状制御用アクチュエータ１８〜２４毎に選択する方法等が、適宜に採用されることとなる。
【００４４】
なお、前述の如く、圧下レベリング調整装置２４とワークロールベンディング差力調整装置２０は、アルミ箔圧延機１２の左右において非対称的な調整が行なわれるようになっているため、それらの形状制御用アクチュエータ２４，２０で制御するのに最適な形状パラメータとしては、８個の形状パラメータ：ΔΛ_ｓ１〜ΔΛ_ｓ８の中から、特に形状偏差の近似次数が奇数次の成分：ΔΛ_ｓ１，ΔΛ_ｓ３，ΔΛ_ｓ５，ΔΛ_ｓ７のうちの何れかが選択される。また、ワークロールベンディング力調整装置１８とＶＣロール油圧調整装置２２は、アルミ箔圧延機１２の左右において対称的な調整が行なわれるようになっているため、それらの形状制御用アクチュエータ１８，２２で制御するのに最適な形状パラメータとしては、８個の形状パラメータ：ΔΛ_ｓ１〜ΔΛ_ｓ８の中から、特に形状偏差の近似次数が偶数次の成分：ΔΛ_ｓ２，ΔΛ_ｓ４，ΔΛ_ｓ６，ΔΛ_ｓ８のうちの何れかが選択されることとなる。
【００４５】
次に、選択部４０にて選択された形状パラメータを制御する形状制御用アクチュエータ１８〜２４を、第一及び第二操作部４２，４４により、そこで算出された操作量に基づいて、それぞれ操作し、またその際に、アルミ箔２８の圧延荷重変化による形状変化の補償と、形状制御用アクチュエータ１８〜２４同士の間における相互干渉に対する補償と、形状パラメータの検出遅れに対する補償とを行なうのである。つまり、それらの補償を行ないつつ、第一及び第二操作部４２，４４にて、各形状制御用アクチュエータ１８〜２４を操作するのであるが、これは、アルミ箔圧延機１２におけるアルミ箔２８の箔形状変化を表す入出力関係のモデル式に基づいて、それぞれ、実行されることとなる。
【００４６】
以下、前記した複数種類の補償を行ないながら、第一及び第二操作部４２，４４によって各形状制御用アクチュエータ１８〜２４を操作する方法について説明するが、ここでは、ワークロールベンディング力調整装置１８で制御する形状パラメータとして、形状偏差の近似次数が４次の形状パラメータ：ΔΛ_ｓ４（形状パラメータの４次成分：ΔΛ_ｓ４）が選択され、また、ＶＣロール油圧調整装置２２で制御する形状パラメータとして、形状偏差の近似次数が２次の形状パラメータ：ΔΛ_ｓ２（形状パラメータの２次成分：ΔΛ_ｓ２）が選択された場合を例示して、詳述することとする。
【００４７】
すなわち、形状パラメータの２次成分と４次成分とを選択し、これらを制御する場合、アルミ箔圧延機１２におけるアルミ箔２８の形状変化を表す入出力関係を示すモデル式は、下式（２）〜（５）のように表される。
【００４８】
【数２】

【数３】

【数４】

【数５】

〔但し、ΔＰ_Ｖ：ＶＣロール圧力変化
ΔＰ_Ｂ：ベンディング力変化
Ｔ_Ｖ：ＶＣロール油圧調整装置を一次遅れ系で近似したときの時定数
Ｔ_Ｂ：ベンディング力調整装置を一次遅れ系で近似したときの時定数
Δｕ_Ｖ：ＶＣロール圧力の変更指令
Δｕ_Ｂ：ベンディング力の変更指令
ΔΛ_２：アルミ箔圧延機直下での形状パラメータの２次成分の変化量
ΔΛ_４：アルミ箔圧延機直下での形状パラメータの４次成分の変化量
Ｋ_ｉｊ：ＶＣロール油圧調整装置とベンディング力調整装置の操作時における形状パラメータの変化を表す係数
Ｋ_ｐｉ：圧延荷重の変化時における形状パラメータの変化を表す係数
ΔＰ：圧延荷重の変化量
Ｌ：形状検出装置の検出遅れ（むだ）時間を表す係数
ΔΛ_ｓ２：形状検出装置の検出値に基づいて算出される形状パラメータの２次成分の変化量
ΔΛ_ｓ４： 形状検出装置の検出値に基づいて算出される形状パラメータの４次成分の変化量
ｓ：ラプラス演算子〕
【００４９】
なお、上記四つのモデル式〔式（２）〜（５）〕では、式（２）にて、ワークロールベンディング力調整装置１８とＶＣロール油圧調整装置２２の動的特性を表現するモデル式が示されていると共に、式（３）の第１項にて、それら二つの形状制御用アクチュエータ１８，２２の操作による各形状パラメータの変化を表現するモデル式が、また式（３）の第２項にて、アルミ箔２８に加えられる圧延荷重の変化による各形状パラメータの変化を表現するモデル式が、それぞれ示されている。更に、式（４）及び式（５）では、形状検出装置でのアルミ箔２８の箔形状の検出遅れ（むだ）時間を表現するモデル式が示されている。また、式（３）から明らかなように、このモデル式においては、アルミ箔圧延機１２の直下での形状パラメータの２次成分と４次成分の変化（ΔΛ_２とΔΛ_４）が、ＶＣロール油圧調整装置２２の操作とワークロールベンディング力調整装置１８の操作の影響が、互いに干渉する系となっている。
【００５０】
ここで、ＶＣロール油圧調整装置２２とワークロールベンディング力調整装置１８の応答速度が十分に速いところから、式（２）のモデル式にて示された、それら二つの形状制御用アクチュエータ１８，２２の動的特性を無視しても、実用上、何等の問題も生じない。そのため、式（３）を、下式（６）のように近似することが出来る。
【数６】

【００５１】
従って、上記した式（６）を用いて、ＶＣロール油圧調整装置２２とワークロールベンディング力調整装置１８の操作量を、下式（７）により求めるのである。このような演算は、ＶＣロール油圧調整装置２２とワークロールベンディング力調整装置１８を操作する第二操作部４４にて、行なわれることとなる。
【数７】

〔但し、［ｘ］^−１：［ｘ］の逆行列
Δｕ’_Ｖ：ＶＣロール圧力の新たな制御指令
Δｕ’_Ｂ：ベンディング力の新たな制御指令〕
【００５２】
そして、ここでは、上記した式（６）、式（７）、及び式（３）から下式（８）のような関係が得られ、これによって、ＶＣロール油圧調整装置２２とワークロールベンディング力調整装置１８の操作に際して、それらの間における静的な非干渉化が達成される。換言すれば、かくして、ＶＣロール油圧調整装置２２とワークロールベンディング力調整装置１８の間における相互干渉が補償されることとなるのである。
【数８】

【００５３】
また、圧延荷重に変動が生じている場合、つまりΔＰ≠０である場合には、圧延荷重の変化による形状パラメータの２次成分と４次成分の変化量（ΔΛ_２とΔΛ_４）を、上記式（８）において０と為せば良い。従って、圧延荷重の変化による形状変化の補償量を、次式（９）により求めるのである。なお、この演算は、第一補償部４８にて行なわれる。また、次式（９）において、Ｋ_ｐｉは、前記せる如く、圧延荷重の変化時における形状パラメータの変化を表す係数であるが、この係数は、圧延条件等により、計算或いは実験的に導出され得るものである。
【数９】

【００５４】
一方、形状パラメータの検出遅れの補償は、例えば、良く知られているスミス法等のむだ時間補償のための制御方法を用いて制御系を設計することによって、比較的に容易に実現されることとなる。
【００５５】
かくして、上記式（９）にて求められる補償量で、アルミ箔２８の圧延荷重変化による箔形状変化を補償しつつ、前記式（７）にて求められる操作量で、ＶＣロール油圧調整装置２２とワークロールベンディング力調整装置１８を操作することによって、それら二つの形状制御用アクチュエータ１８，２２同士の間における相互干渉と形状パラメータの検出遅れをも考慮した上で、選択部４０にて選択された二つの形状パラメータを、ＶＣロール油圧調整装置２２とワークロールベンディング力調整装置１８によって制御して、アルミ箔２８の箔形状不良を修正し、以てアルミ箔２８の箔形状を、目標形状に一致するように制御するのである。
【００５６】
そして、そのようにして、前記二つの形状制御用アクチュエータ１８，２２にて箔形状が制御されたアルミ箔２８において、例えば、局所的な形状不良等が未だ残存する場合等にあっては、それら二つの形状制御用アクチュエータ１８，２２による箔形状の制御後に、残存する形状偏差に応じて、第三操作部４６により、クーラント２６の操作量、つまり、クーラント２６の図示しないノズルからの冷却液の噴射位置や噴射量等を調整しつつ、クーラント２６を操作して、アルミ箔２８の箔形状の制御を更に実施するのである。
【００５７】
このように、本実施形態にあっては、アルミ箔２８の圧延条件に応じて、クーラント２６を除いた四つの形状制御用アクチュエータ１８〜２４で制御するのに最適な形状パラメータが、選択部４０において、各形状制御用アクチュエータ１８〜２４毎にそれぞれ一つずつ選択され、そして、各形状制御用アクチュエータ１８〜２４が、第一及び第二操作部４２，４４にて、圧延条件に応じた操作量で操作されることにより、選択された各形状パラメータが、それら各形状制御用アクチュエータ１８〜２４にて制御されて、アルミ箔２８の箔形状が目標形状となるように制御されるようになっているところから、アルミ箔２８の箔形状を制御するのに最適な形状制御用アクチュエータを最適な操作量で操作することが可能となっているのである。
【００５８】
従って、このような本実施形態によれば、アルミ箔２８の箔形状がより高精度に制御され得、その結果として、目標形状に一致した箔形状を有するアルミ箔２８が、極めて安定的に且つ確実に得られることとなるのである。
【００５９】
また、本実施形態においては、前記四つの形状制御用アクチュエータ１８〜２４を操作する際に、アルミ箔２８の圧延荷重変化による形状変化の補償と、形状制御用アクチュエータ１８〜２４同士の間における相互干渉に対する補償と、形状パラメータの検出遅れに対する補償が行なわれるようになっているところから、アルミ箔２８の箔形状の制御精度が、様々な外乱等によって低下せしめられるようなことが効果的に防止され得て、かかるアルミ箔２８の箔形状が、更に一層高精度に制御され得るのである。
【００６０】
さらに、本実施形態にあっては、第三操作部４６により調整された操作量でクーラント２６が操作されて、前記四つの形状制御用アクチュエータ１８〜２４にて箔形状が制御されたアルミ箔２８の箔形状が更に制御され得るようになっているところから、それら四つの形状制御用アクチュエータ１８〜２４では修正が困難な局所的な形状不良等が有利に修正され得、それによって、目標形状に対してより一層正確に対応した箔形状を有するアルミ箔２８を得ることが可能となるのである。
【００６１】
ところで、前記実施形態では、本発明を四段圧延機からなるアルミ箔圧延機の制御装置に対して適用したものの例を示したが、本発明は、その他、アルミ箔以外の金属箔を圧延する、四段圧延機以外のものも含む各種の箔圧延機における制御装置の何れに対しても、有利に適用され得るものであることは、勿論である。
【００６２】
因みに、かかる本発明に従う箔圧延機における箔形状の制御方式の効果を確認するために、本発明者が行なった実験について、以下に示す。なお、この実験では、特に、制御装置にてＶＣロール油圧調整装置とワークロールベンディング力調整装置を操作することによって得られる箔形状の制御効果について、調べた。
【００６３】
先ず、図１に示される如き構造を有する制御装置１０を備えたアルミ箔圧延機１２を準備した。次いで、広幅のアルミ板材を用いる圧延条件（１）と、狭幅のアルミ板材を用いる圧延条件（２）とにて、平坦な形状を目標形状とする箔圧延を行なうのに先だって、ＶＣロール油圧調整装置２２とワークロールベンディング力調整装置１８で制御するのに最適な形状パラメータを選択するために、それら圧延条件（１）と圧延条件（２）で箔圧延を行なった際におけるＶＣロール油圧調整装置２２とワークロールベンディング力調整装置１８のそれぞれの単位操作量当たりの形状パラメータの変化量を、該形状パラメータの形状近似次数毎に、それぞれ、実験的に求めた。圧延条件（１）で箔圧延を行なった際の結果を図２と図３に、また、圧延条件（２）で箔圧延を行なった際の結果を図４と図５に、それぞれ示した。
【００６４】
そして、それら図２と図３の結果から、ワークロールベンディング力調整装置１８の単位操作量当たりの形状パラメータの変化量が最も大きくなっている４次成分の形状パラメータを、圧延条件（１）にて箔圧延を行なう際に、ワークロールベンディング力調整装置１８にて制御すべき形状成分として、決定し、また、ＶＣロール油圧調整装置２２の単位操作量当たりの形状パラメータの変化量が最も大きくなっている２次成分の形状パラメータを、圧延条件（１）にて箔圧延を行なう際に、ＶＣロール油圧調整装置２２で制御すべき形状成分として、決定した。一方、図４と図５の結果から、ワークロールベンディング力調整装置１８の単位操作量当たりの形状パラメータの変化量が最も大きくなっている８次成分の形状パラメータを、圧延条件（２）にて箔圧延を行なう際に、ワークロールベンディング力調整装置１８にて制御すべき形状成分として、決定し、また、ＶＣロール油圧調整装置２２の単位操作量当たりの形状パラメータの変化量が最も大きくなっている２次成分の形状パラメータを、圧延条件（２）にて箔圧延を行なう際に、ＶＣロール油圧調整装置２２で制御すべき形状成分として、決定した。
【００６５】
その後、前記圧延条件（１）にて、アルミ板材に対する箔圧延を実際に行なうと共に、この箔圧延の実施に際して、箔圧延直後のアルミ箔の幅方向の形状を検出し、その検出値と、目標とする平坦形状との偏差に基づいて、アルミ箔の箔形状不良を表現する複数の形状パラメータを演算した後、それら算出された複数の形状パラメータの中から、ＶＣロール油圧調整装置２２とワークロールベンディング力調整装置１８とでそれぞれ制御する形状パラメータとして、その２次成分と４次成分とを選択し、そしてその後、第二操作部４４にて算出された操作量にて、ＶＣロール油圧調整装置２２とワークロールベンディング力調整装置１８とを操作した。これによって、２次成分と４次成分の形状パラメータを制御しつつ、目的とする平坦な形状のアルミ箔を得た。その際におけるアルミ箔の箔形状の目標形状との偏差の経時的変化を図６に示した。
【００６６】
また、それとは別に、前記圧延条件（２）にて、アルミ板材に対する箔圧延を実際に行なうと共に、この箔圧延の実施に際して、箔圧延直後のアルミ箔の幅方向の形状を検出し、その検出値と、目標とする平坦形状との偏差に基づいて、アルミ箔の箔形状不良を表現する複数の形状パラメータを演算した後、それら算出された複数の形状パラメータの中から、ＶＣロール油圧調整装置２２とワークロールベンディング力調整装置１８とでそれぞれ制御する形状パラメータとして、その２次成分と８次成分とを選択し、そしてその後、第二操作部４４にて算出された操作量にて、ＶＣロール油圧調整装置２２とワークロールベンディング力調整装置１８とを操作した。これによって、２次成分と８次成分の形状パラメータを制御しつつ、目的とする平坦な形状のアルミ箔を得た。その際におけるアルミ箔の箔形状の目標形状との偏差の経時的変化を図７に示した。
【００６７】
図６及び図７の結果からも明らかなように、目的とするアルミ箔を与えるアルミ板材の幅が互いに異ならしめられた圧延条件（１）と圧延条件（２）の何れにおいても、ＶＣロール油圧調整装置２２とワークロールベンディング力調整装置１８とで制御するのに最適な形状パラメータを選択して、制御することにより、箔形状不良が、数秒で、速やかに修正され得、それによって、目標形状を有するアルミ箔が、極めて有利に且つ確実に得られることが、明確に認識されるのである。
【００６８】
【発明の効果】
以上の説明からも明らかなように、本発明に従う箔圧延機における箔形状の制御装置にあっては、箔圧延材の箔形状をより高精度に制御することが出来、それによって、目標形状に一致した箔形状を有する箔圧延材の成形を、極めて効果的に実現せしめ得るのである。そして、その結果として、箔圧延材の破断や品質低下の発生を未然に防止して、目的とする箔圧延材の生産性の向上及び安定化を極めて有利に達成することが可能となるのである。
【００６９】
また、本発明に従う箔圧延機における箔形状の制御方法によれば、箔圧延材の箔形状の高性能制御が達成され得、それによって、目標形状に一致した形状を有する箔圧延材を、優れた生産性と高い安定性とをもって確実に得ることが出来るのである。
【図面の簡単な説明】
【図１】本発明に従う構造を有する、箔圧延機における箔形状の制御装置とそれが設置される箔圧延機の構成をそれぞれモデル的に示す、一部ブロック図を含む概略説明図である。
【図２】図１に示された制御装置を有する箔圧延機により、広幅のアルミ板材を用いる圧延条件で箔圧延を行なった際におけるワークロールベンディング力調整装置の単位操作量当たりの形状パラメータの変化量を、該形状パラメータの形状近似次数毎に求めた結果を示すグラフである。
【図３】図１に示された制御装置を有する箔圧延機により、広幅のアルミ板材を用いる圧延条件で箔圧延を行なった際におけるＶＣロール油圧調整装置の単位操作量当たりの形状パラメータの変化量を、該形状パラメータの形状近似次数毎に求めた結果を示すグラフである。
【図４】図１に示された制御装置を有する箔圧延機により、狭幅のアルミ板材を用いる圧延条件で箔圧延を行なった際におけるワークロールベンディング力調整装置の単位操作量当たりの形状パラメータの変化量を、該形状パラメータの形状近似次数毎に求めた結果を示すグラフである。
【図５】図１に示された制御装置を有する箔圧延機により、狭幅のアルミ板材を用いる圧延条件で箔圧延を行なった際におけるＶＣロール油圧調整装置の単位操作量当たりの形状パラメータの変化量を、該形状パラメータの形状近似次数毎に求めた結果を示すグラフである。
【図６】図１に示された制御装置を有する箔圧延機により、広幅のアルミ板材を用いる圧延条件で箔圧延を行なって得られたアルミ箔の箔形状の目標形状との偏差の経時的変化を示す説明図である。
【図７】図１に示された制御装置を有する箔圧延機により、狭幅のアルミ板材を用いる圧延条件で箔圧延を行なって得られたアルミ箔の箔形状の目標形状との偏差の経時的変化を示す説明図である。
【符号の説明】
１０ 制御装置 １２ アルミ箔圧延機
１４ ワークロール １６ バックアップロール
１８ ワークロールベンディング力調整装置
２０ ワークロールベンディング差力調整装置
２２ ＶＣロール油圧調整装置 ２４ 圧下レベリング調整装置
２６ クーラント ２８ アルミ箔
３０ 形状検出装置 ３２ 荷重検出装置
３８ 演算部 ４０ 選択部
４２ 第一操作部 ４４ 第二操作部
４６ 第三操作部 ４８ 第一補償部[0001]
【Technical field】
The present invention relates to a foil shape control device and a foil shape control method in a foil rolling machine, and in particular, operates a plurality of types of shape control actuators according to the widthwise shape of a foil rolled material immediately after foil rolling. Accordingly, the present invention relates to a control device for controlling the foil shape of a rolled foil and a method for controlling the foil shape of the rolled foil with higher accuracy.
[0002]
[Background Art]
As is well known, when a plate-shaped metal material such as aluminum or an aluminum alloy is rolled using a rolling mill such as a four-high rolling mill or a six-high rolling mill, the width direction of the obtained rolled sheet material is reduced. If the shape of the plate is wavy at both ends and the shape of the middle part is wavy, such as elongation, it may cause breakage of the rolled plate or decrease in quality, and the productivity of the target rolled plate will be significantly reduced. Will be done.
[0003]
For this reason, conventional rolling mills are generally provided with shape control actuators such as a rolling leveling adjustment device, a work roll bending force adjustment device, a work roll bending difference force adjustment device, and a crown amount variable roll hydraulic adjustment device. By operating each of these plural types of shape control actuators, the plate shape of the obtained rolled plate material is corrected to the target shape.
[0004]
By the way, using a conventional rolling mill having a plurality of types of shape control actuators as described above, as one method for obtaining a rolled sheet having a shape more accurately corresponding to a target shape, a rolling mill is used. A shape detection device capable of detecting the shape in the width direction of the rolled sheet material immediately after rolling is provided, and each of the shape control actuators is operated so that a detection value detected by the shape detection device matches a target value. Thus, a method of controlling the shape of a rolled sheet material has been known in the past, and in recent years, based on such a method, control of the sheet shape of a rolled sheet material has been performed with even higher precision. Various control methods and control devices have been proposed.
[0005]
For example, Japanese Patent Application Laid-Open No. 10-43806 discloses that a plurality of types of shape control actuators are classified into a plurality of groups according to a difference in response time, and the grouped shape control actuators are respectively assigned to response times. A control device that solves the problem of mutual interference between the respective shape control actuators by controlling by a method and thereby can improve control performance is disclosed.
[0006]
Japanese Patent Application Laid-Open No. H11-123428 discloses that a shape control actuator (shape control mechanism) is classified into a plurality of groups according to a difference in the incidence of product defects during the operation. There is disclosed a method of controlling the plate shape of a rolled plate by adjusting the operation amount of the shape control actuators belonging to a group having a low defect occurrence rate in order.
[0007]
Further, Japanese Patent Publication No. 7-34930 discloses a method of compensating for a detection delay of a plate shape in a shape detection device, estimating a disturbance which causes a shape defect of a rolled plate material to be obtained, and responding to the shape control actuator. A method for controlling the shape of a rolled sheet while compensating for the delay has been disclosed.
[0008]
However, when performing a foil rolling to obtain a foil rolled material having a thickness much smaller than a rolled plate material from an aluminum metal plate material or the like using a rolling machine such as the four-high rolling mill or the six-high rolling mill described above. Even if various control methods and control devices for the plate shape of the rolled sheet material were used as they were, it was difficult to accurately control the foil shape of the obtained foil rolled material. A rolled foil having the same foil shape could not be obtained.
[0009]
[Solution]
Here, the present invention has been made in view of such circumstances, and a problem to be solved is that it is possible to control the foil shape of a rolled material with high accuracy, and thereby to achieve a target shape. It is an object of the present invention to provide a foil shape control device in a foil rolling machine, which enables the formation of a rolled material having the same foil shape. It is another technical object of the present invention to provide a method capable of achieving high-performance control of the foil shape of a rolled foil.
[0010]
[Solution]
The present inventor has conducted various studies to solve the above-described problems, and as a result of performing various studies, in the foil rolling to obtain a very thin foil rolled material having a thickness in the range of several μm to several hundred μm, It was found that if the so-called rolling conditions such as the width, thickness, and material of the metal sheet used were different, even if the shape control actuator was operated under the same conditions, there would be a difference in the shape change characteristics of the rolled foil. Therefore, from this, it was found that adjusting the operation amount of the shape control actuator according to the rolling conditions is extremely important in performing foil shape control in foil rolling with higher accuracy. is there.
[0011]
That is, the present invention has been completed on the basis of such knowledge, and the gist of the present invention is that a rolling leveling adjusting device, a work roll bending force adjusting device, a work roll bending differential force adjusting device, and a crown amount variable. Four shape control actuators of the roll hydraulic pressure adjusting device, and a foil shape control device in a foil rolling machine comprising a shape detection device that detects the widthwise shape of the foil rolled material immediately after the foil rolling, wherein the shape control device, Calculating means for calculating a plurality of shape parameters representing a foil shape defect of the rolled foil based on the detected value of the shape in the width direction of the rolled foil detected by the detecting device; and From among the plurality of calculated shape parameters, a shape parameter to be controlled by the shape control actuator is selected in accordance with the rolling conditions of the foil rolled material. Means, and an actuator operation means for calculating an operation amount of the shape control actuator for controlling the shape parameter selected by the selection means, and operating the shape control actuator with the calculated operation amount. Further, the present invention provides a foil shape control device in a foil rolling machine, wherein the actuator shape controlling device controls the foil shape of the rolled material by operating the shape control actuator. .
[0012]
In short, in the apparatus for controlling a foil shape in a foil rolling mill according to the present invention as described above, the selecting means is selected from among a plurality of shape parameters expressing the defective shape of the rolled material calculated by the calculating means. Thus, the shape parameters controlled by the shape control actuator are selected according to the rolling conditions of the foil rolled material. For example, the unit operation of each shape control actuator according to various rolling conditions The amount of change of the shape parameter per amount is measured in advance for each shape parameter, and then, under rolling conditions at the time of performing foil rolling, the amount of change per unit operation amount of the shape control actuator is large, Select shape parameters that greatly affect the shape control of the foil shape, or actuators for each shape control according to various rolling conditions The characteristics are grasped in advance, and then, depending on the rolling conditions at the time of performing the foil rolling, the shape parameters that can be effectively controlled by a shape control actuator capable of sufficiently exhibiting the characteristics are selected. According to the rolling conditions of the foil rolling to be performed, the optimum shape parameter to be controlled by each shape control actuator can be selected from a plurality of shape parameters by the selection means, and The actuator for shape control that controls the selected shape parameter can be operated by the actuator operation means with the operation amount calculated by the operation means.
[0013]
Therefore, in the control apparatus of the foil shape in the foil rolling machine according to the present invention, in accordance with the rolling conditions, the optimal shape control actuator for correcting the defective shape of the foil rolled material is operated with the optimal operation amount. You can do it.
[0014]
Therefore, in the apparatus for controlling a foil shape in a foil rolling machine according to the present invention as described above, the foil shape of the rolled material can be controlled with higher accuracy, and thereby, the foil shape that matches the target shape is obtained. Therefore, it is possible to extremely effectively realize the formation of a rolled foil having the following. As a result, it is possible to prevent breakage and deterioration of the quality of the rolled foil beforehand, and to extremely advantageously achieve the desired productivity of the rolled foil.
[0015]
According to one preferred aspect of the foil shape control device in the foil rolling mill according to the present invention, a model expressing a change in the shape parameter due to a change in a rolling load applied to the foil rolled material. A first compensation for compensating for a shape change of the foil rolled material due to the rolling load change with the calculated compensation amount. Means are provided, and the first compensating means is configured to control the foil shape of the rolled foil while compensating for a shape change due to the change in the rolling load of the rolled foil.
[0016]
If such a configuration is adopted, not only the difference in various rolling conditions, but also the foil shape defect of the foil rolled material caused by the change in the rolling load can be extremely effectively and appropriately corrected, and This makes it possible to form a rolled material more accurately corresponding to the target shape.
[0017]
According to another advantageous aspect of the foil shape control device in the foil rolling mill according to the present invention, a model expressing a change in the shape parameter due to an operation of the shape control actuator is provided. Based on a model expressing the dynamic characteristics of the actuator and a model expressing the detection delay time of the foil shape of the shape detection device, mutual interference between the shape control actuators and the detection delay of the shape parameter are determined. And a second compensating means for compensating for the mutual interference between the shape control actuators and the detection delay of the shape parameter while compensating for the foil rolling. It is configured so that the foil shape of the material is controlled.
[0018]
In the foil shape control device in the foil rolling mill having such a configuration, the selected shape parameter is controlled only by the shape control actuator operated to control the selected shape parameter. On the other hand, the influence of other shape control actuators can be advantageously eliminated, and the shape defect of the foil rolled material immediately below the work roll of the rolling mill, that is, the shape defect of the foil rolled material to be corrected Can be accurately grasped, whereby the foil shape of the rolled foil can be controlled with higher precision and stability.
[0019]
Further, according to another preferred embodiment of the foil shape control device in the foil rolling mill according to the present invention, in addition to the four shape controlling actuators, a foil shape control in a foil rolling mill including a coolant is provided. A coolant operation for operating the coolant while adjusting an operation amount of the coolant so as to correct a shape defect still remaining in the foil rolled material whose foil shape is controlled by the shape control actuator with respect to the device. Means will be further provided.
[0020]
If such a configuration is adopted, for example, a local shape defect (a shape defect expressed by a higher-order component of a shape parameter) of a foil rolled material, which is difficult to correct with the four shape control actuators, The coolant can be corrected stably and accurately, so that the formation of a rolled material having a foil shape that more accurately corresponds to the target shape can be realized more reliably.
[0021]
In the present invention, in order to solve another technical problem as described above, a rolling leveling adjustment device, a work roll bending force adjustment device, a work roll bending difference force adjustment device, and a crown amount variable roll hydraulic adjustment The method of controlling the foil shape in a foil rolling mill equipped with four shape control actuators of the apparatus, detects the widthwise shape of the foil rolled material immediately after foil rolling, based on the detected value, the foil rolled material After calculating a plurality of shape parameters expressing the foil shape defect, among the calculated plurality of shape parameters, according to the rolling conditions of the foil rolled material, a shape parameter controlled by the shape control actuator is used. And then operating a shape control actuator that controls the selected shape parameter to obtain the foil shape of the foil rolled material. The control method of the foil shape in foil rolling mill, characterized in that to perform the control also is to its gist.
[0022]
In short, according to the method of the present invention, a shape parameter to be controlled is selected according to rolling conditions, and the shape parameter is controlled by a shape control actuator. Optimal control of the shape parameters becomes possible.
[0023]
Therefore, according to such a method for controlling a foil shape in a foil rolling mill according to the present invention, high-performance control of the foil shape of the foil rolled material can be achieved, whereby the foil rolling having a shape matching the target shape can be achieved. The material can be reliably obtained with excellent productivity and high stability.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, in order to specifically clarify the present invention, according to the present invention, a specific configuration of a foil shape control device and a foil shape control method in a foil rolling mill will be described in detail with reference to the drawings. Will be described.
[0025]
First, FIG. 1 shows a model of an aluminum foil-shaped control device as an example of a foil-shaped control device having a structure according to the present invention, and an aluminum foil rolling mill in which it is installed. . As is clear from FIG. 1, the aluminum foil rolling mill 12 in which the control device 10 of the present embodiment is installed is formed of a general four-high rolling mill, and is positioned at predetermined intervals in the vertical direction. It has a pair of work rolls 14a and 14b, and a pair of backup rolls 16a and 16b positioned so as to sandwich them vertically. Here, of the pair of backup rolls 16a, 16b, the lower backup roll 16b is formed of a crown variable roll (hereinafter, referred to as a VC roll) incorporating a known crown variable mechanism. I have.
[0026]
In addition, the aluminum foil rolling mill 12 includes a work roll bending force adjusting device 18, a work roll bending differential force adjusting device 20, a crown variable roll hydraulic adjusting device 22 (hereinafter referred to as a VC roll hydraulic adjusting device 22), and a reduction leveling. Five shape control actuators of the adjusting device 24 and the coolant 26 are provided. Each of these five shape control actuators has a conventionally known structure. By operating each of these actuators, the foil shape of the aluminum foil 28 as the rolled material can be variously changed. It has become.
[0027]
Further, on the output side of the aluminum foil rolling mill 12, a shape detecting device 30 for detecting the shape of the aluminum foil 28 in the width direction is provided. The shape detecting device 30 also has a conventionally known structure, and has a roll form in which a plurality of load cells (not shown) are provided on the outer peripheral surface. The aluminum foil 28 is brought into contact, and the tension at a plurality of locations in the width direction of the aluminum foil 28 is measured by each load cell, whereby the tension distribution in the width direction of the aluminum foil 28 is detected. It is configured so that the foil shape in the width direction of the aluminum foil 28 immediately after can be detected.
[0028]
Furthermore, in such an aluminum foil rolling mill 12, a load detecting device 32 constituted by a load cell or the like is also provided, and the change in the rolling load applied to the aluminum foil 28 during the foil rolling is determined by the applied load. The detection is performed by the detection device 32. In FIG. 1, reference numeral 36 denotes a winding machine for winding the rolled aluminum foil 28.
[0029]
On the other hand, the control device 10 has a calculation unit 38 as calculation means and a selection unit 40 as selection means. Then, the deviation between the width direction shape of the aluminum foil 28 detected by the shape detection device 30 and the target shape of the aluminum foil 28 is input to the arithmetic unit 38, and the arithmetic unit 38 Based on such a deviation, a plurality of shape parameters expressing the shape defect of the rolled aluminum foil 28 are calculated.
[0030]
In addition, the selection unit 40 includes a plurality of shape parameters calculated by the calculation unit 38 and rolling conditions for rolling the aluminum foil 28, such as the thickness, width, and material of the aluminum plate 34 that gives the aluminum foil 28. Is input. Then, in the selection unit 40, the control is performed by the four shape control actuators 18, 20, 22, and 24 excluding the coolant 26 in accordance with the above-described rolling conditions from the plurality of input shape parameters. The shape parameters are configured to be selected respectively.
[0031]
Further, the control device 10 has first and second operation units 42 and 44 as actuator operation units, and a third operation unit 46 as coolant operation units. Of the three operating units, the first operating unit 42 controls the shape parameter selected by the selecting unit 40 and the work roll bending differential force adjusting device 20 to be controlled by the rolling leveling adjusting device 24. Each of the shape parameters selected by the selection unit 40 is input from the selection unit 40. In addition, in the selection unit 40, as the shape parameter input to the first operation unit 42, the reduction leveling adjustment device 24 and the work roll bending differential force adjustment device 20 that perform asymmetric adjustment on the left and right of the aluminum foil rolling mill 12 are used. One of the components whose shape approximation order is an odd number, which is effectively controlled in this way, is selected.
[0032]
Then, in the first operation section 42, the operation amount of the draft leveling adjustment device 24 and the operation amount of the work roll bending differential force adjustment device 20, which respectively control the two shape parameters input thereto, are calculated and calculated. The two shape control actuators 24 and 20 are configured to be operated with the manipulated variables.
[0033]
The second operation unit 44 has a shape parameter selected by the selection unit 40 to be controlled by the work roll bending force adjustment device 18 and a selection by the selection unit 40 to be controlled by the VC roll hydraulic pressure adjustment device 22. The selected shape parameters are input from the selection unit 40. The shape parameters input to the second operation unit 44 are effectively controlled by the work roll bending force adjusting device 18 and the VC roll hydraulic pressure adjusting device 22 that perform symmetric adjustment on the left and right sides of the aluminum foil rolling mill 12. A controllable component having an even-order shape approximation order is selected by the selection unit 40.
[0034]
Then, in the second operation unit 44, the operation amount of the work roll bending force adjustment device 18 and the operation amount of the VC roll oil pressure adjustment device 22 that respectively control the two shape parameters input thereto are calculated. The two shape control actuators 18 and 22 are respectively operated by the calculated operation amounts.
[0035]
Further, in the third operation unit 46, the shape defect is corrected by the four shape control actuators 18 to 24 except the coolant 26, and the aluminum foil 28 whose foil shape is controlled by the shape detection device 30. A deviation between the detected shape in the width direction and the target shape is input. Then, in the third operating section 46, the shape deviation inputted thereto is eliminated, in other words, the aluminum foil 28 whose foil shape is controlled by the four shape controlling actuators 18 to 24 still remains. The amount of operation of the coolant 26, that is, the position and amount of injection of the coolant from a nozzle (not shown) of the coolant 26 is adjusted so as to correct the shape defect, and the coolant 26 is operated. is there.
[0036]
Furthermore, such a control device 10 is provided with a first compensating section 48 as first compensating means. In the first compensator 48, a change in the rolling load on the aluminum foil 28, which is detected by the load detecting device 32, is input. And a compensation amount for the change in the rolling load is calculated based on a model expressing the change in the shape parameter due to the change in the rolling load, and the calculated compensation amount determines the shape of the aluminum foil 28 derived from the change in the rolling load. The change is compensated.
[0037]
In the control device 10, the first and second operating units 42 and 44 that operate the four shape control actuators 18 to 24 except for the coolant 26 are used when operating the four shape control actuators 18 to 24. A model expressing changes in shape parameters controlled by the respective shape control actuators 18 to 24, a model expressing dynamic characteristics of the respective shape control actuators 18 to 24, Based on a model expressing the delay time of the detection of the foil shape, mutual interference between the shape control actuators 18 to 24 and compensation for the detection delay of each shape parameter can be performed by a known method. Has become. That is, here, the first and second operation units 42 and 44 function as second compensation means for compensating mutual interference between the shape control actuators 18 to 24 and detection delay of each shape parameter. It is also configured.
[0038]
By the way, when controlling the foil shape of the aluminum foil 28 to be rolled by the aluminum foil rolling mill 12 by the control device 10 having such a structure, for example, the operation is performed in the following procedure. It will be advanced.
[0039]
That is, first, while the shape detection device 30 detects the width direction shape of the aluminum foil 28 immediately after the foil rolling, based on the detected width direction shape of the aluminum foil 28, the calculation unit 38 A plurality of shape parameters representing the foil shape defect of the rolled aluminum foil are calculated.
[0040]
Specifically, for example, based on the deviation between the width direction shape of the aluminum foil 28 detected by the shape detection device 30 and the target shape of the aluminum foil 28, it is described in JP-B-7-34930. By a method similar to the method of calculating the shape parameter expressing the sheet shape defect of the rolled sheet material, the shape parameter as represented by the following equation (1): ΔΛ _si Is calculated. And such a shape parameter: ΔΛ _si For example, a shape deviation that can be easily controlled by four shape control actuators such as a work roll bending force adjusting device 18, a work roll bending differential force adjusting device 20, a draft leveling adjusting device 22, and a VC roll hydraulic adjusting device 24. Eight shape parameters with approximate orders of 1 to 8: ΔΛ _s1 ~ ΔΛ _s8 You get Note that such a shape parameter: ΔΛ _si Is not limited to the above-described example. For example, without using the shape deviation as described above, the width direction shape of the aluminum foil 28 detected by the shape detection device 30 is directly used. Shape parameters may be derived.
[0041]
(Equation 1)

[Where i is the approximate order of the detected shape deviation]
w: width of aluminum foil
x: width direction position
t: time
τ: detection delay of shape detector
f (x, t-τ): deviation from the target value of the width direction foil shape distribution at the position where the shape detecting device is provided.
J _i (X): arbitrary different functions]
[0042]
Next, the eight shape parameters calculated by the calculation unit 38: ΔΛ _s1 ~ ΔΛ _s8 The work roll bending force adjusting device 18, the work roll bending, and the like, according to the rolling conditions when the aluminum foil 28 is subjected to the foil rolling, for example, the thickness, the width, the material, etc. of the aluminum plate 34 that gives the aluminum foil 28. The shape parameters optimal to be controlled by the four shape control actuators of the differential force adjustment device 20, the screw leveling adjustment device 22, and the VC roll oil pressure adjustment device 24 are selected by the selection unit 40 in each of the shape control actuators 18 to 24. For each, select one each.
[0043]
The method of selecting the shape parameters here is not particularly limited either. For example, each shape parameter per unit operation amount of each of the four shape control actuators 18 to 24 according to various rolling conditions. : ΔΛ _s1 ~ ΔΛ _s8 The amount of change of each shape parameter: ΔΛ _s1 ~ ΔΛ _s8 Each time, the amount of change per unit operation amount of the shape control actuators 18 to 24 is large under the rolling conditions of the foil rolling of the aluminum foil 28 actually performed, Shape parameter that greatly affects shape control: ΔΛ _s1 ~ ΔΛ _s8 The method of selecting each of the shape control actuators 18 to 24, or the characteristics of each of the shape control actuators 18 to 24 according to various rolling conditions are grasped in advance, and then the aluminum foil rolling is performed. A shape parameter that can be effectively controlled by the shape control actuators 18 to 24 that can sufficiently exhibit characteristics according to rolling conditions at the time of execution: ΔΛ _s1 ~ ΔΛ _s8 Is appropriately selected for each of the shape control actuators 18 to 24.
[0044]
As described above, since the pressure leveling adjustment device 24 and the work roll bending differential force adjustment device 20 are configured to perform asymmetric adjustment on the left and right sides of the aluminum foil rolling mill 12, their shape control actuators are used. The optimum shape parameters to be controlled by 24 and 20 include eight shape parameters: ΔΛ _s1 ~ ΔΛ _s8 Among the components, the component whose approximate order of the shape deviation is an odd order: Δ 数 _s1 , ΔΛ _s3 , ΔΛ _s5 , ΔΛ _s7 Is selected. Further, since the work roll bending force adjusting device 18 and the VC roll hydraulic pressure adjusting device 22 are symmetrically adjusted on the left and right sides of the aluminum foil rolling mill 12, the shape controlling actuators 18 and 22 use the same. There are eight shape parameters: Δ と し て as the optimum shape parameters to control. _s1 ~ ΔΛ _s8 Of the components, in particular, the component whose approximate order of the shape deviation is an even order: ΔΛ _s2 , ΔΛ _s4 , ΔΛ _s6 , ΔΛ _s8 Is selected.
[0045]
Next, the shape control actuators 18 to 24 for controlling the shape parameters selected by the selection unit 40 are respectively operated by the first and second operation units 42 and 44 based on the operation amounts calculated there. Further, at this time, compensation for a change in shape due to a change in the rolling load of the aluminum foil 28, compensation for mutual interference between the shape control actuators 18 to 24, and compensation for detection delay of the shape parameter are performed. In other words, the shape control actuators 18 to 24 are operated by the first and second operation units 42 and 44 while compensating for them. Each of them is executed based on a model formula of an input / output relationship representing a change in foil shape.
[0046]
Hereinafter, a method of operating each of the shape control actuators 18 to 24 by the first and second operation units 42 and 44 while performing the above-described plurality of types of compensation will be described. Here, the work roll bending force adjusting device 18 is described. Is a shape parameter whose approximate order of the shape deviation is the fourth order: ΔΛ _s4 (Fourth-order component of shape parameter: ΔΛ _s4 ) Is selected, and as a shape parameter controlled by the VC roll hydraulic pressure adjusting device 22, a shape parameter whose approximate order of the shape deviation is a second order: ΔΛ _s2 (Secondary component of shape parameter: ΔΛ _s2 ) Will be described in detail by way of example.
[0047]
That is, when the secondary and quaternary components of the shape parameter are selected and controlled, the model formula indicating the input / output relationship representing the shape change of the aluminum foil 28 in the aluminum foil rolling mill 12 is expressed by the following formula (2) ) To (5).
[0048]
(Equation 2)

(Equation 3)

(Equation 4)

(Equation 5)

[However, ΔP _V : VC roll pressure change
ΔP _B : Bending force change
T _V : Time constant when the VC roll hydraulic pressure adjustment device is approximated by a first-order lag system
T _B ： Time constant when bending force adjuster is approximated by first-order lag system
Δu _V : VC roll pressure change command
Δu _B : Bending force change command
ΔΛ ₂ ： Change of the secondary component of the shape parameter immediately below the aluminum foil rolling mill
ΔΛ ₄ ： Change of quaternary component of shape parameter just below aluminum foil rolling mill
K _ij : Coefficient representing the change of the shape parameter when operating the VC roll hydraulic pressure adjusting device and the bending force adjusting device
K _pi : Coefficient representing shape parameter change when rolling load changes
ΔP: change in rolling load
L: Coefficient representing detection delay (dead time) of the shape detection device
ΔΛ _s2 : The amount of change in the secondary component of the shape parameter calculated based on the detection value of the shape detection device
ΔΛ _s4 : The amount of change in the fourth order component of the shape parameter calculated based on the detection value of the shape detection device
s: Laplace operator]
[0049]
In the above four model equations [Equations (2) to (5)], the equation formula (2) expresses the dynamic characteristics of the work roll bending force adjustment device 18 and the VC roll oil pressure adjustment device 22. In addition, a model expression expressing the change of each shape parameter due to the operation of the two shape control actuators 18 and 22 in the first term of the expression (3) is given by the second term of the expression (3). In the section, model equations expressing changes in each shape parameter due to changes in the rolling load applied to the aluminum foil 28 are shown. Further, in the equations (4) and (5), model equations expressing the detection delay (dead time) of the foil shape of the aluminum foil 28 in the shape detection device are shown. Further, as is apparent from equation (3), in this model equation, the change (ΔΛ) between the secondary component and the quaternary component of the shape parameter immediately below the aluminum foil rolling mill 12. ₂ And ΔΛ ₄ ) Is a system in which the influence of the operation of the VC roll hydraulic pressure adjusting device 22 and the operation of the work roll bending force adjusting device 18 interfere with each other.
[0050]
Here, since the response speeds of the VC roll hydraulic pressure adjusting device 22 and the work roll bending force adjusting device 18 are sufficiently fast, the two shape control actuators 18, 22 represented by the model formula of Expression (2) are used. Even if the dynamic characteristics of are ignored, there is no practical problem. Therefore, Expression (3) can be approximated as Expression (6) below.
(Equation 6)

[0051]
Therefore, the operation amount of the VC roll hydraulic pressure adjusting device 22 and the work roll bending force adjusting device 18 is obtained by the following expression (7) using the above expression (6). Such a calculation is performed by the second operation unit 44 that operates the VC roll hydraulic pressure adjusting device 22 and the work roll bending force adjusting device 18.
(Equation 7)

[However, [x] ^-1 : Inverse of [x]
Δu ' _V : New control command for VC roll pressure
Δu ' _B : New control command for bending force]
[0052]
Then, here, from the above-described equations (6), (7) and (3), a relation such as the following equation (8) is obtained, whereby the VC roll hydraulic pressure adjusting device 22 and the work roll bending force are obtained. During operation of the adjusting devices 18, a static decoupling between them is achieved. In other words, the mutual interference between the VC roll hydraulic pressure adjusting device 22 and the work roll bending force adjusting device 18 is thus compensated.
(Equation 8)

[0053]
When the rolling load fluctuates, that is, when ΔP ≠ 0, the change amount (ΔΛ) between the secondary component and the quaternary component of the shape parameter due to the change in the rolling load. ₂ And ΔΛ ₄ ) May be set to 0 in the above equation (8). Therefore, the compensation amount of the shape change due to the change of the rolling load is obtained by the following equation (9). This calculation is performed by the first compensator 48. In the following equation (9), K _pi Is a coefficient representing the change in the shape parameter when the rolling load changes, as described above, and this coefficient can be calculated or experimentally derived depending on the rolling conditions and the like.
(Equation 9)

[0054]
On the other hand, the compensation for the detection delay of the shape parameter can be relatively easily realized by designing a control system using a control method for dead time compensation such as the well-known Smith method. It becomes.
[0055]
Thus, while compensating for the change in the foil shape due to the change in the rolling load of the aluminum foil 28 with the compensation amount determined by the above equation (9), the VC roll hydraulic pressure adjusting device 22 is controlled by the operation amount determined by the above equation (7). By operating the work roll bending force adjusting device 18 and the work roll bending force adjusting device 18, the selection is made by the selector 40 in consideration of the mutual interference between the two shape control actuators 18 and 22 and the detection delay of the shape parameter. The two shape parameters are controlled by the VC roll hydraulic pressure adjusting device 22 and the work roll bending force adjusting device 18 to correct the defective foil shape of the aluminum foil 28, thereby changing the foil shape of the aluminum foil 28 to the target shape. It is controlled to match.
[0056]
In the case where the aluminum foil 28 whose foil shape is controlled by the two shape control actuators 18 and 22 in this way, for example, if a local shape defect still remains, After the foil shape is controlled by the two shape control actuators 18 and 22, the operation amount of the coolant 26, that is, the cooling liquid from the nozzle (not shown) of the coolant 26 is operated by the third operation unit 46 in accordance with the remaining shape deviation. By controlling the coolant 26 while adjusting the injection position and the injection amount, the foil shape of the aluminum foil 28 is further controlled.
[0057]
As described above, in the present embodiment, the optimum shape parameters to be controlled by the four shape control actuators 18 to 24 excluding the coolant 26 according to the rolling conditions of the aluminum foil 28 are determined by the selection unit 40. In the above, one for each of the shape control actuators 18 to 24 is selected, and each of the shape control actuators 18 to 24 is operated by the first and second operation units 42 and 44 in accordance with the rolling conditions. By operating the amount, the selected shape parameters are controlled by the respective shape control actuators 18 to 24 so that the foil shape of the aluminum foil 28 is controlled to the target shape. Therefore, it is possible to operate the optimal shape control actuator for controlling the foil shape of the aluminum foil 28 with the optimal operation amount.
[0058]
Therefore, according to the present embodiment, the foil shape of the aluminum foil 28 can be controlled with higher precision, and as a result, the aluminum foil 28 having a foil shape that matches the target shape can be extremely stably and It will be surely obtained.
[0059]
Further, in the present embodiment, when operating the four shape control actuators 18 to 24, the compensation of the shape change due to the change in the rolling load of the aluminum foil 28 and the mutual operation between the shape control actuators 18 to 24 are performed. Since the compensation for the interference and the compensation for the detection delay of the shape parameter are performed, it is possible to effectively prevent the control accuracy of the foil shape of the aluminum foil 28 from being lowered by various disturbances or the like. Thus, the foil shape of the aluminum foil 28 can be controlled with even higher precision.
[0060]
Further, in the present embodiment, the coolant 26 is operated by the operation amount adjusted by the third operation unit 46, and the aluminum foil 28 whose foil shape is controlled by the four shape control actuators 18 to 24 is used. Since the foil shape can be further controlled, local shape defects or the like, which are difficult to correct with the four shape control actuators 18 to 24, can be advantageously corrected, and thereby the target shape can be adjusted. On the other hand, it is possible to obtain the aluminum foil 28 having a foil shape corresponding more accurately.
[0061]
By the way, in the said embodiment, although the example of what applied this invention to the control apparatus of the aluminum foil rolling mill which consists of a four-high rolling mill was shown, this invention rolls other metal foils other than aluminum foil. Of course, the present invention can be advantageously applied to any of the control devices in various foil rolling mills including those other than the four-high rolling mill.
[0062]
Incidentally, an experiment conducted by the inventor to confirm the effect of the foil shape control method in the foil rolling mill according to the present invention will be described below. In this experiment, particularly, the control effect of the foil shape obtained by operating the VC roll hydraulic pressure adjusting device and the work roll bending force adjusting device with the control device was examined.
[0063]
First, an aluminum foil rolling mill 12 provided with a control device 10 having a structure as shown in FIG. 1 was prepared. Next, under the rolling condition (1) using a wide aluminum plate material and the rolling condition (2) using a narrow aluminum plate material, prior to performing the foil rolling to make the flat shape the target shape, the VC roll hydraulic pressure is used. In order to select the optimum shape parameters for control by the adjusting device 22 and the work roll bending force adjusting device 18, the VC roll hydraulic pressure adjustment is performed when the foil rolling is performed under the rolling conditions (1) and (2). The amount of change of the shape parameter per unit operation amount of each of the device 22 and the work roll bending force adjusting device 18 was experimentally obtained for each shape approximation order of the shape parameter. 2 and 3 show the results when foil rolling was performed under the rolling condition (1), and FIGS. 4 and 5 show the results when foil rolling was performed under the rolling condition (2).
[0064]
From the results shown in FIGS. 2 and 3, the shape parameter of the fourth-order component having the largest change in the shape parameter per unit operation amount of the work roll bending force adjusting device 18 is set as the rolling condition (1). When the foil rolling is performed, the shape component to be controlled by the work roll bending force adjusting device 18 is determined, and the amount of change in the shape parameter per unit operation amount of the VC roll hydraulic pressure adjusting device 22 becomes the largest. The shape parameter of the secondary component is determined as the shape component to be controlled by the VC roll hydraulic pressure adjusting device 22 when performing the foil rolling under the rolling condition (1). On the other hand, from the results of FIGS. 4 and 5, the shape parameter of the eighth-order component in which the change amount of the shape parameter per unit operation amount of the work roll bending force adjusting device 18 is the largest is determined under the rolling condition (2). When performing the foil rolling, it is determined as a shape component to be controlled by the work roll bending force adjusting device 18, and the change amount of the shape parameter per unit operation amount of the VC roll hydraulic pressure adjusting device 22 is the largest. The shape parameter of the secondary component is determined as the shape component to be controlled by the VC roll hydraulic pressure adjusting device 22 when performing the foil rolling under the rolling condition (2).
[0065]
Then, under the above-mentioned rolling condition (1), the foil rolling is actually performed on the aluminum plate material, and at the time of performing the foil rolling, the shape in the width direction of the aluminum foil immediately after the foil rolling is detected, and the detected value and the target After calculating a plurality of shape parameters expressing the foil shape defect of the aluminum foil based on the deviation from the flat shape to be used, the VC roll hydraulic pressure adjusting device 22 and the work roll are selected from the calculated plurality of shape parameters. The secondary component and the quaternary component are selected as the shape parameters to be controlled by the bending force adjusting device 18, respectively, and then the VC roll hydraulic pressure adjusting device is operated by the operation amount calculated by the second operation unit 44. 22 and the work roll bending force adjusting device 18 were operated. Thus, the desired flat aluminum foil was obtained while controlling the shape parameters of the secondary component and the quaternary component. FIG. 6 shows the change over time of the deviation of the foil shape of the aluminum foil from the target shape at that time.
[0066]
Separately from this, under the above-mentioned rolling condition (2), the foil rolling on the aluminum plate material is actually performed, and at the time of performing this foil rolling, the shape in the width direction of the aluminum foil immediately after the foil rolling is detected. After calculating a plurality of shape parameters expressing the foil shape defect of the aluminum foil based on the deviation between the value and the target flat shape, the VC roll hydraulic pressure adjusting device is selected from the calculated plurality of shape parameters. The secondary component and the eighth-order component are selected as the shape parameters to be controlled by the work roll bending force adjusting device 18 and the work roll bending force adjusting device 18, respectively. The roll hydraulic pressure adjusting device 22 and the work roll bending force adjusting device 18 were operated. Thus, the desired flat aluminum foil was obtained while controlling the shape parameters of the secondary component and the eighth component. FIG. 7 shows the change over time of the deviation of the foil shape of the aluminum foil from the target shape at that time.
[0067]
As is clear from the results of FIGS. 6 and 7, the VC roll hydraulic pressure was obtained under both the rolling conditions (1) and the rolling conditions (2) in which the width of the aluminum plate material for providing the target aluminum foil was different from each other. By selecting and controlling the optimal shape parameters to be controlled by the adjusting device 22 and the work roll bending force adjusting device 18, the foil shape defect can be quickly corrected in a few seconds, thereby achieving the target shape. It is clearly recognized that an aluminum foil having the following is very advantageously and reliably obtained.
[0068]
【The invention's effect】
As is clear from the above description, in the foil shape control device in the foil rolling machine according to the present invention, the foil shape of the rolled material can be controlled with higher precision, and thereby, the target shape can be adjusted. Forming of a rolled foil having the same foil shape can be realized very effectively. And as a result, it is possible to prevent breakage or deterioration of the quality of the rolled foil material from occurring beforehand, and to improve and stabilize the productivity of the intended rolled foil material extremely advantageously. .
[0069]
Further, according to the method of controlling the foil shape in the foil rolling machine according to the present invention, high-performance control of the foil shape of the foil rolled material can be achieved, whereby a foil rolled material having a shape corresponding to the target shape can be excellent. It can be reliably obtained with high productivity and high stability.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view including a partial block diagram, modelly showing a configuration of a foil shape control device in a foil rolling mill and a foil rolling mill in which it is installed, having a structure according to the present invention.
FIG. 2 shows the shape parameters per unit operation amount of a work roll bending force adjusting device when a foil rolling machine having a control device shown in FIG. 1 performs foil rolling under rolling conditions using a wide aluminum plate material. 9 is a graph showing a result of obtaining a change amount for each shape approximation order of the shape parameter.
FIG. 3 shows changes in shape parameters per unit operation amount of a VC roll hydraulic pressure adjusting device when a foil rolling machine having the control device shown in FIG. 1 performs foil rolling under rolling conditions using a wide aluminum plate material. 6 is a graph showing a result of obtaining an amount for each shape approximation order of the shape parameter.
FIG. 4 is a view showing a shape parameter per unit operation amount of a work roll bending force adjusting device when a foil rolling machine having a control device shown in FIG. 1 performs foil rolling under rolling conditions using a narrow aluminum plate material. 6 is a graph showing the results obtained by calculating the amount of change for each shape approximation order of the shape parameter.
FIG. 5 is a view showing a shape parameter per unit operation amount of a VC roll hydraulic pressure adjusting device when a foil rolling machine having a control device shown in FIG. 1 performs foil rolling under rolling conditions using a narrow aluminum plate material. 9 is a graph showing a result of obtaining a change amount for each shape approximation order of the shape parameter.
FIG. 6 is a graph showing the variation over time of the deviation of the foil shape of an aluminum foil obtained from a foil rolling mill having a control device shown in FIG. 1 under a rolling condition using a wide aluminum plate material from a target shape. It is explanatory drawing which shows a change.
FIG. 7 is a graph showing the aging of the deviation of the foil shape of an aluminum foil obtained from a foil rolling mill having a control device shown in FIG. 1 under a rolling condition using a narrow aluminum plate material from a target shape. It is explanatory drawing which shows a target change.
[Explanation of symbols]
10 control device 12 aluminum foil rolling machine
14 Work roll 16 Backup roll
18 Work roll bending force adjustment device
20 Work roll bending differential force adjustment device
22 VC Roll Hydraulic Adjustment Device 24 Rolling Leveling Adjustment Device
26 Coolant 28 Aluminum foil
30 Shape detector 32 Load detector
38 operation unit 40 selection unit
42 First operation unit 44 Second operation unit
46 Third operation unit 48 First compensation unit

Claims (5)

The four shape control actuators of the rolling leveling adjustment device, the work roll bending force adjustment device, the work roll bending differential force adjustment device, and the crown amount variable roll oil pressure adjustment device, and the widthwise shape of the foil rolled material immediately after the foil rolling. A foil shape control device in a foil rolling mill having a shape detection device to detect,
Calculating means for calculating a plurality of shape parameters representing a foil shape defect of the rolled foil, based on the detected value of the shape in the width direction of the rolled foil detected by the shape detecting device, and the calculating means Selecting means for selecting a shape parameter to be controlled by the shape controlling actuator from the plurality of shape parameters calculated in accordance with the rolling conditions of the foil rolled material; and a shape selected by the selecting means. An actuator operating means for calculating an operation amount of the shape control actuator for controlling the parameters and operating the shape control actuator with the calculated operation amount; Controlling the foil shape of the foil rolled material by operating an actuator for the foil, wherein the foil shape of the foil rolled material is controlled. Apparatus. Based on a model representing a change in the shape parameter due to a change in the rolling load applied to the rolled foil, a compensation amount of a shape change due to the change in the rolling load of the rolled foil is calculated, and the calculated amount is calculated. A first compensating means for compensating a shape change of the foil rolled material due to the rolling load change with the compensation amount, and the first compensating means performs a shape change of the foil rolled material due to the rolling load change. The foil shape control device for a foil rolling mill according to claim 1, wherein the foil shape of the foil rolled material is controlled while compensating for (1). A model expressing a change in the shape parameter due to an operation of the shape control actuator, a model expressing a dynamic characteristic of the shape control actuator, and a model expressing a detection delay time of the foil shape of the shape detection device. And a second compensating means for compensating for mutual interference between the shape control actuators and a detection delay of the shape parameter based on the second control means. The foil rolling according to claim 1 or 2, wherein the foil shape of the foil rolled material is controlled while compensating for mutual interference between the actuators and a delay in detecting the shape parameter. Control device for foil shape in machine. A foil shape control device in a foil rolling mill provided with a coolant in addition to the four shape control actuators, wherein the shape is still remaining in the foil rolled material whose foil shape is controlled by the shape control actuator. The foil according to any one of claims 1 to 3, further comprising a coolant operation means for operating the coolant while adjusting the operation amount of the coolant so as to correct the defect. Control device for foil shape in rolling mill. Rolling leveling adjustment device, work roll bending force adjustment device, work roll bending differential force adjustment device, and a crown amount variable roll oil pressure adjustment device in the foil shape control method in a foil rolling machine equipped with four shape control actuators,
After detecting the shape in the width direction of the foil rolled material immediately after the foil rolling, and calculating a plurality of shape parameters representing the foil shape defect of the foil rolled material based on the detected value, the plurality of calculated shapes are calculated. From the parameters, according to the rolling conditions of the foil rolled material, select a shape parameter to be controlled by the shape control actuator, and then, by operating the shape control actuator to control the selected shape parameter And a method of controlling a foil shape in a foil rolling machine, wherein the foil shape of the rolled material is controlled.

Images