201139001 六、發明說明： 【發明所屬之技術销域】 發明領域 本發明係有關於金屬板材之挺軋機，乃一種可賦予高 響應度且強力之輥彎曲力之輥軋機。特別是有關於一種即 使以遞減彎曲裝置之響應度低於遞增彎曲裝置之響應度之 多段輥軋機，亦可賦予高響應之軋板冠高·形狀控制機能 之金屬板材之輥軋方法。 發明背景 於4段輥軋機或6段輥軋機等多段輥軋機進行軋板冠 高·形狀控制輥軋時之控制方法，有於工作輥軸承座賦予 彎曲力之輥彎曲（roll bending)、使輥於輥軸向上位移之輥忾 移（roll shift)、於輥配有交又角之輥交叉(r〇11 cr〇ss)等。 該等控制方法中，輥橫移或輥交叉均難以於輥軋中迅 速變更設定。因此，不適於要求在輥軋中進行控制之軋板 冠高·形狀控制輥軋。相對於此，輥彎曲裝置可控制油壓， 並可於輥軋中變更輥彎曲力，故適於軋板冠高.形狀控制 輥軋。 專利文獻1中記載一種利用具有輥彎曲機構與輥蟥移 機構之熱精軋機，對由板寬、板厚、鋼種等各異之鋼材接 合而成之輥軋材連續輥軋之方法。但，相較於輥彎曲力之 變更速度，輥橫移位置之變更速度非常缓慢，因此於輥軋 中固定輥橫移位置後，僅以響應度高之輥彎曲力進行冠高 201139001 控制。 此時，軋板冠高·形狀控制係藉由輥彎曲裝置之控制 速度決定速度，而輥彎曲裝置具有高響應度是一直以來的 期望。 專利文獻2中記載，輥彎曲裝置之響應度係由伺服閥之 二次配管長度決定（請參照專利文獻2之段落[0014]、第1 圖）。因此，乃藉由用以控制遞增側與遞減側之油壓差之伺 服閥控制彎曲力。為確保高響應度，故將該等伺服閥配置 於輥軋機機架之驅動側與操作側之各入料側及出料側共計 4處之機架立柱側面，並將各伺服閥至油壓缸之配管長度設 為2m以内。 先前技術文獻 專利文獻 專利文獻1日本專利公開公報特開平第6-55207號 專利文獻2曰本專利公開公報特開平第8-215730號 【發明内容】 發明概要 發明欲解決之課題 然而，輥彎曲裝置之響應度並非僅由伺服閥至油壓缸 之配管長度決定。 舉例言之，第1圖所示之輥軋機，係具有上下一對工作 輥1-1、1-2與用以分別支持其等之上下一對支撐輥2-1、2-2 之4段輥軋機。該輥軋機係呈遞增彎曲裝置6-1〜6-4裝入突 出塊5-1、5-2，且遞減彎曲裝置7-1〜7-4裝入上下支撐輥軸 201139001 私座4 2之形式。娜式之輥軋機，遞減彎曲裝置之響 應速度低於遞増彎曲裝置之響應速度。 因此，為控制軋板冠高.形狀而使工作輥產生遞增彎 曲力作用時’可進行高響應控制，但產生遞減彎曲力作用 時，無法純軋巾迅賴更設定。因而無法去雜軋材料 入料側板厚或輕軋材料溫度等1¾軋中會變動之干擾因素， 以致有製品品質或良品率降低之情形。 又，遞減彎曲裝置之響應度之所以未變高，或為無法 使用固定配管之故。即，工作輥因輥軋運轉而比支樓輥容 易耗損，故須定期換輥。但第L圖所示之輥軋機係將遞增 彎曲裝置裝人突出塊，故於換輥作業時無須拆裝遞增彎曲 裝置之油Μ配管，並可藉由固定配管連接油壓控制閱。因 此可4木用用以進行高響應油壓控制之伺服閥。相對於此， 第1圖之輥軋機之遞減彎曲裝置因裝人上下支㈣轴承 座，故每次換輥作業時必須拆裝遞減彎曲裝置之油壓配 笞油壓配€拆裝時油壓配管内混入微小異物之可能性提 高’因此無法採用用以進行高響應油壓控制之伺服閥。又， 因必須藉由撓性配管等呈柔性構造且拆裝自如之油壓配管 連接油壓控制閥’以致應傳達之油壓變動經吸收而衰減。 即，可藉由固定安裝之油壓配管連接油壓控制閥，或 必須藉由撓性配管等呈柔性構造且拆裝自如之油壓配管連 接油壓控制閥’乃致使遞減彎曲裝置之響應度低於遞增彎 曲裝置之響應度之最大原因。 又’由於遞減彎曲裝置無法高響應控制，因此輥軋開 201139001 始時、輥軋完畢時負載或解除遞減彎曲力時造成輥軋不穩 疋，以致製品品質惡化且產能降低。 亦即尚未負載輥軋載荷之空轉時無法負載遞減·灣曲 力。因此，必須於輥軋開始時迅速負載遞減彎曲力，另於 輥軋完畢時必須迅速回復輥平衡狀態。其中，藉由響應度差 之遞減彎曲裝置之控制變更輥彎曲力時，輥軋材料前端尾端 因未負載預定之遞減彎曲力以致形狀不良部增長。 即，第2發現在於，第丨圖所示形式之輥軋機中產生遞 減彎曲力作用時，難以於輥軋中迅速變更設定，因此無法 去除輥軋材料入料側板厚或輥軋材料溫度等輥軋中會變動 之干擾因素，以致製品品質或良品率降低。 本發明應解決之課題在於提供一種於遞減彎曲裝置之 響應度低於遞增彎曲裝置之響應度之輥軋機中，使工作親 產生遞減彎曲力作用時，亦可賦予高響應之軋板冠高•形 狀控制機能之金屬板材之輥軋方法。 用以解決課題之手段 本發明人為解決前述課題，經反覆仔細檢討後，發現 藉由在遞減彎曲裝置之響應度低於遞增彎曲裝置之響應度 之輥軋機中，設定兩彎曲裝置之合力所形成之彎曲力，且 輥軋中之控制僅由響應度高之遞增彎曲裝置進行，可進行 呵響應之軋板冠高•形狀控制’本發明因而產生。 即，為控制軋板冠高•形狀，所用之輥軋方法係於產 生遞減彎曲力作用作為工作輥彎曲力時，利用響應度高之 遞增彎曲裝置變更輥軋開始時及輥軋完畢時之輥彎曲力。 201139001 高響應之遞增彎曲裝置可補償（彌補）遞減彎㈣置之響鹿 進而 ㈣材料人料側板厚或_材料 軋中會變動之干擾，藉由高響應之遞增f曲裝置之控制 可形成良好之軋板冠高•形狀，並可顯著改善製品^及 產能。 以請所示之幸昆軋機為例，其構造係基於換觀時配管 拆裝容易度故於遞減彎曲裝置之油壓配管採用呈柔性構造 且拆裝自如之油壓配管。因此輥軋機具有遞減弯曲裝置之 響應度勢必低於遞增彎曲裝置之響應度之特性。但該魏 機之構造係將遞增彎曲裝置配置於突出塊，因此兼具可於 突出塊中配置大容量之遞增彎曲裝置，及可藉由固定安裝 之油壓配官連接油壓控制閥故可形成響應度高之遞增彎曲 裝置之優良特性。因此，可達成上述響應度高之輥彎曲力 控制。 基於該等上述發現，本發明人完成一金屬板材之輥軋 方法之發明’即使於遞減彎曲裝置之響應度低於遞增彎曲 裝置之響應度之輥軋機，亦可賦予高響應之軋板冠高•形 狀控制機能。其要旨如下。 (1)一種金屬板材之輥軋方法，係利用輥軋機進行，該 輥軋機係具有一用以產生遞增彎曲力之遞增彎曲裝置、及 一用以產生遞減彎曲力之遞減彎曲裝置，且前述遞減彎曲 裝置之響應度低於前述遞增彎曲裝置者； 其特徵在於輥軋開始前，使遞增彎曲力與遞減彎曲力 201139001 雙方作用，合力為相、4 作輥軸承座。 田、砰衡力之轉彎曲力並作用於工 之後，一面改變遞減彎曲力 ^ 力，—面改變遞増脊曲力 達預疋之魏軋中遞減彎曲 合力維持輥彎曲力。此步驟若:减彎曲力與遞増f曲力之 疋之輥軋巾遞減彎 初切㈣⑼ 亚使遞增饗 7 ’達到遞減彎曲力與遞増 #用於作業輥軸 之狀態，則可予以省略。 之合力形成轉彎曲力 之後，輥軋開始時，繼續 預定之觀軋中遞減彎曲力同時^ 4曲力保持在前述 定之輥軋中工作輥f曲力並作用# ”曲力’合力為預 親軋中，藉由控制遞增彎曲力工作轉細承座。 軋中工作《曲力之狀態下進行親軋於維持前述預定之輥 之後，輥軋完畢時，改變遞増變曲力 力合力為相當於觀平衡力之料曲 麵遞減彎曲 座’且於該狀態下結束金屬板村之轉軋。乍用於工作觀軸承 之後，為維持前述合力而成 曲力與遞增f曲力1步驟若 力’減少遞減彎 軋中遞減彎曲力，並將遞增彎曲力 ==力為預定之輥 達到遞減彎曲力與遞增彎曲力之入於工作輥軸承座， 態，亦可予以省略。 $ 聲曲力之狀 (2)如（1)之金屬板材之輥軋方法， 該輥乳機至少具備-對上下卫作_係利用輥㈣進行， 片锟與一對分別支 作輥之上下支撐輥，並將構成分別 、D•"寺 與上下工作輥對應之前 201139001 述遞增彎曲裝置的遞增油壓缸，藉由業經固定之油壓配管 連接各自之油壓控制閥且裝入朝軺軋機機架内側突出之突 出塊； 進而，至少構成與上工作親對應之前述遞減弯曲裝置 的遞減油壓缸，係藉由呈柔性構造且拆裝自如之油壓配管 連接油壓控制閥’並裝入上支撐親軸承座。 (3)如(2)之金屬板材之輥軋方法，係測量前述遞減油壓 缸内或該油壓缸相連之油壓配管内的油壓’並依據該測量 值控制遞增彎曲力，使作用於工作親軸承座之輕彎曲力達 到預定值。 其中所謂親彎曲力之預定值，係由輥軋條件等預先求 得之輥彎曲力值。此外，作用於工作輥軸承座之輥彎曲力’ 係遞增彎曲力與遞減彎曲力之合力。 發明效果 本發明之輥軋方法，係利用響應度高之遞增彎曲裝置 進行輥軋開始時及輥軋完畢時之輥彎曲力變更。 因此，基於換輥時之配管拆裝容易度，於遞減彎曲裝 置之油壓配管採用呈柔性構造且拆裝自如之油壓配管，如 此一來即使為遞減彎曲裝置之響應度低於遞增彎曲裝置之 響應度之輥軋機，亦可由高響應之遞增彎曲裝置補償遞減 彎曲裝置之響應度，藉以賦予高響應且強力之軋板冠高· 形狀控制機能。 是以’藉由本發明之輥軋方法，即使面對輥軋材料入 料側板厚或輥軋材料溫度等輥軋中會變動之干擾仍可形成 9 201139001 良好之軋板冠高•形狀，並可大幅改善製品品質及良品率。 圖式簡單說明 第1圖係顯示本發明目的物之輥軋機之一構造例之側 視圖。 第2圖所示者係本發明之輥軋方法之操作流程一例。 第3圖所示者係第2圖之操作流程下輥彎曲力等之時間 序列變化。 第4圖所示者係遞減彎曲裝置之響應度低時輥彎曲力 等之時間序列變化。 第5圖所示者係本發明之輥軋方法之操作流程另一例。 第6圖所示者係第5圖之操作流程下輥彎曲力等之時間 序列變化。 第7圖係顯示本發明目的物之輥軋機之另一構造例之 側視圖。 第8圖係顯示本發明目的物之輥軋機之另一構造例之 側視圖。 I：實施方式3 用以實施發明之型態 以下參照第1圖〜第8圖說明本發明之輥軋方法。 第1圖係顯示本發明目的物之輥軋機之一構造例之側 視圖，並以該輥軋機為例進行說明。如該圖所示，本發明目 的物之輥軋機，係一具有上下一對工作輥Μ、1-2與用以分 別支持該等工作輥之上下一對支撐輥2 -卜2 - 2之多段輥軋機。 另，該圖所示之輥軋機係呈薄鋼帶之串列式精軋機等 10 201139001 所採用之形式之4段輥軋機，但並非以此為限，6段輥軋機 亦可。 且該觀軋機中，朝機架9内側突出之突出塊5-1、5-2中 裝入有用以於上工作輥1-1負載遞增彎曲力之上遞增彎曲 裝置6-1、6-2、與用以於下工作輥μ2負載遞增彎曲力之下 遞增彎曲裝置6-3、64。 因此，工作輥1_1、1-2在輥軋運轉下將造成損耗，故須 疋期換輥。但第1圖之親軋機無須於換輕作業時拆裝遞増彎 曲裝置之油壓配管。各遞增彎曲裝置6-1〜6-4可藉由固定安 裝之油壓配管連接各油壓控制閥，因此可採用用以進行高 響應油壓控制之伺服^如此一來，即可形成響應度高之 遞増彎曲裝置。 另外，用以於上工作親Η負載遞減彎曲力之上遞減脊 曲裝置7_1、7-2係裝人上支魏麻座4]，用以於下工作 輥Μ負載遞減彎曲力之下遞減f曲裝置7_3、7_4係裝入下 支撐輥軸承座4-2。 附y卜2_2部分雖不及工作輥之程度，伸於 報軋運轉下仍將造成損耗，故狀期換輥m該 輥軋機勢須於換輥作業時拆裝遞減彎 气典裝置7-1〜7-4之油 姿配管，以致拆裝時油壓配管内^微小異物之可能性提 高。因此，各遞減彎曲裝置7]〜7_4難輯用用以進行高塑 應油壓控制之伺服閥。又，藉由撓性配 u. ^ re專呈柔性構造且拆 裝自如之油壓配錢接各油壓控制心便於拆裝配管時，因 柔性構造之故，乃有吸收油壓之變如致衰減之情形。 201139001 疋x基於換輥時之配管拆裝容易度，於遞減脊曲裝 置71 7 4之'由壓配管採用撓性配管而不採用伺服閥時，遞 減彎曲裝置之響應度將低於遞增彎曲I置之響應度。 因此為控制軋板冠高.形狀而產生遞減f曲力作用 以作為工作輥相力時，難以於親軋中迅速變更設定。如 此-來’對純軋材料人料側板厚或輥軋材料溫度等輥軋 中會變動之干_素’無法進行適當之輥彎曲控制，以致 有降低製品品質或良品率之情形。 另一方面，尚未負载輥軋載荷之空轉時無法負載遞減 .4曲力。運用遞減彎曲力時，必須於輥軋開始時迅速由空 轉時之輥平衡狀態切換至遞減彎曲力，再於輥軋完畢時迅 速回復輥平衡狀態。 因此，若由響應度差之遞減彎曲裝置控制輥彎曲力之 變更，輥軋材料前端尾端可能因未負載預定之遞減彎曲力 以致形狀不良部增長。 其中，專利文獻2所載之輥彎曲裝置係由伺服閥之二次 配管長度決定輥彎曲裝置之響應度。即，將各伺服閥至油 壓缸之配管長度縮短至2m以内’並藉由伺服閥控制遞增侧 之油壓與遞減側之油壓之差，可確保彎曲力之高響應度。 但工作輥或支撐輥之換輥作業必須定期實施，故將遞增側 與遞減側雙方做成固定油壓配管不切實際。因此，對於提 高產生遞減彎曲作用時之響應度之本案發明之課題，無法 充分解決。 本發明之輥軋方法亦解決專利文獻2中之課題。 ⑤ 201139001 另，遞增彎曲裝置係指用以將增大輥缝方向上之力施 於工作輥軸承座上之油壓裝置。所謂遞增彎曲裝置乃包含 其致動器亦即油壓缸之裝置之總稱。本發明為簡化說明， 所謂遞增彎曲裝置，在無特別註明下係指其致動器，即油 壓缸。並且將遞增彎曲裝置加載於工作輥上之力稱為遞增 彎曲力。反之，用以將縮小輥縫方向上之力施於工作輥軸 承座上之油壓裝置稱為遞減彎曲裝置，並且將其加載於工 作輥上之力稱為遞減彎曲力。但，本發明為簡化說明，所 謂遞減彎曲裝置，在無特別註明下係則指其致動器，即油 壓缸。 第2圖所示者係本發明之輥軋方法之操作流程一例，再 具體言之，係響應度高之遞增彎曲裝置與相較之下響應度 稍低之遞減彎曲裝置之操作流程。 又，第3圖顯示在該輥軋方法下，對一根輥軋材料進行 輥軋運轉時相伴而生之輥彎曲力等之時間序列變化。第3圖 中由上而下顯示輥軋載荷、遞增彎曲裝置之輸出、遞減彎 曲裝置之輸出、合力之工作親彎曲力之時間序列變化。以 下根據第2圖、第3圖進行說明。 首先於輥軋開始前，實施對應後續將進行輥軋之輥軋 材料之設定計算，並演算·輸出工作輥彎曲力之設定值FR。 其中FR演算得出負值，即遞減彎曲力。另，本發明中，輥 彎曲力係將遞增彎曲力（遞增方向（拉開輥之方向）之力）定 義為正值，並將遞減彎曲力（遞減方向（壓下輥之方向）之力） 定義為負值。 13 201139001 輥軋開始前，使遞增彎曲力與遞減彎曲力雙方作用 合力為相當於輥平衡力（Fb)之遞增側輥彎曲力並 作輥軸承座。 即，輥軋前之空轉時，假設遞增彎曲裝置輪 0)遞減f曲裝置輸出為〇8(<〇)，Ib+Db形成轉平衡力以〉 0) 0 另’報平衡力FB，係定為即使空轉狀態下之輥軋機加 減速’由電動機驅動之工作輥與被動之支撐輥仍不滑動之 力’此外1^係按遞減彎曲裝置之致動器不離工作輥軸承座 之程度之最小油壓設定即可。 之後於輥軋開始前之某一時刻（時間軸上之a點），將足 以產生輥軋中工作輥彎曲力FR作用之預定輥軋中遞減彎曲 裝置輸出Ds ’按Ds = Fr_Ir2算式演算得出。且同時輸出 Ds及Is，以使輥平衡力（Fb)達到一定。 其中，Ir係輥軋中之遞增彎曲裝置輸出，且預先決定 :近可控制〜之絕對值不致過大之最小值之值，Is係已設 定is + ds=fb之遞増彎曲裝置輸出。 因此於妓時刻’合力之工作輥f曲力仍維持Fb之 狀態，未有實質上之變化。 '、人 開始輥軋後，於繼續控制遞減彎曲力保持一 定值同時降低遞增f曲力，合力而成預定之遞減側之輥f 曲力並作用於工作輥軸承座之狀態下，進行輥軋。 ;輥軋開始時刻（時間轴上之匕點），將遞增彎曲裝 置輸出由Is變變 笑文馮IR。如此一來，於響應慢之遞減彎曲裝置 201139001 :出維持Ds之狀態下，藉由響應快之遞增-曲裝置之控 將合力之工作觀彎曲力由觀平衡力fb(>〇)迅速切^ 為遞減彎曲力fr(<0)。 、 另所明輥乳開始時⑻係指開始輕乾之時間點，該 ::之制’舉例言之，按設定滾乾機之輥㈣荷测量用 二计所偵測之載荷，超過設定計算所預測演算之觀乾載 ^之。例如3G%之時刻之方法歧即可。該數值宜設定於10 〜3〇%之間。如此可與輥平衡力之㈣有所區別，並可迅 速偵測輥軋開始。 1之後於輥軋完畢時，將輥f曲力回復輥軋開始前之狀 〜、’再合力為相當於輥平衡力之遞増側之輥料力並作用於 工作觀轴承座，且於該狀態下結束金屬板材之輥乳。 即’於輥軋完畢時刻（時間軸上之。點），於遞減彎曲裝 置輸出_Ds之狀態下，將響應快之遞增f曲裝置輸出由 h回復到Is。如此一來’可將合力之工作輥f曲力由遞減弯 曲力FR(<0)迅速切換為輥平衡力Fb(>〇)。 另，所謂輥軋完畢時刻（時_上之成)係指輥札完畢 時。㈣刻之偵測按設定滾軋機魏軋載荷測量用測力計 所谓測之載荷，低於輥軋中實際輥軋載荷之時間序列平均 值之例如鄕之時刻之方法決定即可。該數值可任意設 定，但宜設定於50〜80%之間。如此可與㈣中之棍彎曲 力之變動有所區別，並可迅速偵測輥軋完畢。201139001 VI. Description of the Invention: [Technical Field of the Invention] Field of the Invention The present invention relates to a rolling mill for sheet metal, which is a rolling mill capable of imparting high resilience and strong roll bending force. In particular, there is a method of rolling a sheet metal having a high response sheet height and shape control function, even in a multi-stage rolling mill in which the resilience of the decreasing bending device is lower than that of the incremental bending device. BACKGROUND OF THE INVENTION A control method for rolling crown height and shape control rolling in a multi-stage rolling mill such as a 4-stage rolling mill or a 6-stage rolling mill is to roll bending and impart a bending force to a work roll chock. The roll is displaced in the axial direction of the roll, and the roll is provided with a cross-angled roll crossover (r〇11 cr〇ss). In these control methods, it is difficult to rapidly change the setting during roll traverse or roll crossover. Therefore, it is not suitable for the crown height and shape control rolling which requires control in rolling. On the other hand, the roll bending device can control the oil pressure and can change the roll bending force during rolling, so it is suitable for rolling plate crown height and shape control rolling. Patent Document 1 describes a method of continuously rolling a rolled material obtained by joining steel materials having different widths, thicknesses, and steel grades by a hot finish rolling mill having a roll bending mechanism and a roll shifting mechanism. However, the change speed of the roll traverse position is very slow compared to the change speed of the roll bending force. Therefore, after the traverse position of the fixed roll in the roll, the crown height is controlled by the roll bending force of high resilience 201139001. At this time, the crown height and shape control of the rolling sheet determines the speed by the control speed of the roll bending device, and the high bending degree of the roll bending device is a constant expectation. According to Patent Document 2, the responsiveness of the roll bending device is determined by the length of the secondary pipe of the servo valve (refer to paragraph [0014] and Fig. 1 of Patent Document 2). Therefore, the bending force is controlled by a servo valve for controlling the oil pressure difference between the increasing side and the decreasing side. In order to ensure high responsiveness, the servo valves are disposed on the side of the rack column at the four sides of the driving side and the discharging side of the rolling mill frame, and the servo valves are hydraulically pressed. The length of the piping of the cylinder is set to be within 2 m. PRIOR ART DOCUMENT PATENT DOCUMENT PATENT DOCUMENT PATENT DOCUMENT PATENT DOCUMENT PATENT DOCUMENT PATENT DOCUMENT PATENT DOCUMENT EMBODIMENT [J]. The responsiveness is not determined solely by the length of the piping from the servo valve to the hydraulic cylinder. For example, the rolling mill shown in Fig. 1 has a pair of upper and lower work rolls 1-1, 1-2 and four sections for supporting the upper and lower pair of support rolls 2-1, 2-2, respectively. Rolling mill. The rolling mill is loaded with the protruding blocks 5-1, 5-2 in the incremental bending device 6-1~6-4, and the decreasing bending device 7-1~7-4 is loaded into the upper and lower support roller shafts 201139001 Private seat 4 2 form. In the roller type of the Na-type, the response speed of the decreasing bending device is lower than the response speed of the bending device. Therefore, in order to control the crown height and shape of the rolled plate and cause the work roll to produce an increasing bending force, a high response control can be performed, but when the rolling force is reduced, the pure rolled towel cannot be set more quickly. Therefore, it is impossible to remove the disturbance factor which may vary in the rolling of the material side plate thickness or the light rolling material temperature, such that the product quality or the yield rate is lowered. Further, the responsiveness of the decreasing bending device does not become high, or the fixed piping cannot be used. That is, the work roll is more easily worn than the roll of the branch due to the rolling operation, so the roll must be changed periodically. However, the rolling mill shown in Fig. L is equipped with an incremental bending device for loading the protruding block. Therefore, it is not necessary to disassemble the oil piping of the incremental bending device during the roll changing operation, and the hydraulic pressure control can be connected by the fixed piping. Therefore, it can be used for servo valves with high response oil pressure control. On the other hand, the rolling bending device of the rolling mill of Fig. 1 is equipped with a lower bearing (four) bearing seat, so that each time the roller changing operation is performed, the hydraulic pressure of the decreasing bending device must be disassembled and equipped with oil pressure. The possibility of mixing tiny foreign matter in the piping is increased. Therefore, the servo valve for high-response hydraulic pressure control cannot be used. In addition, it is necessary to connect the hydraulic control valve by a flexible pipe which is flexible and has a flexible structure, so that the hydraulic pressure change to be transmitted is absorbed and attenuated. In other words, the hydraulic control valve can be connected by a hydraulic pipe that is fixedly mounted, or the hydraulic pressure control valve must be connected by a flexible pipe such as a flexible pipe, and the hydraulic pressure control valve can be connected to the hydraulic pressure pipe to cause the responsiveness of the decreasing bending device. The biggest reason for the lower response than the incremental bending device. In addition, since the decreasing bending device cannot be controlled with high response, the roll is opened at the beginning of 201139001, when the load is completed or the bending force is released, the rolling is unstable, so that the quality of the product deteriorates and the productivity is lowered. That is to say, when the idling of the rolling load is not applied, the load cannot be decremented. Therefore, it is necessary to rapidly reduce the bending force at the start of the rolling, and it is necessary to quickly return to the roller balance state at the time of completion of the rolling. In the case where the bending force of the roll is changed by the control of the decreasing bending device of the responsiveness difference, the leading end of the rolled material is decremented by the predetermined load, so that the shape defect portion is increased. In other words, the second finding is that when the rolling force is applied to the rolling mill of the form shown in the figure, it is difficult to rapidly change the setting during the rolling, and therefore it is impossible to remove the roll material such as the material side thickness of the rolling material or the temperature of the rolling material. Interference factors that may change during rolling, resulting in a decrease in product quality or yield. The object to be solved by the present invention is to provide a rolling mill having a higher response than a progressive bending device in which the resilience of the decreasing bending device is lower than that of the incremental bending device, and the high-resistance rolling plate crown height can be imparted when the working prone produces a decreasing bending force. Rolling method for sheet metal of shape control function. Means for Solving the Problems The present inventors have solved the above problems and, after careful review, found that the resultant force of the two bending devices is set by the rolling mill in which the resilience of the decreasing bending device is lower than the resilience of the incremental bending device. The bending force, and the control in the rolling is performed only by the incremental bending device with high responsivity, and the crown height and shape control of the rolling plate can be performed. That is, in order to control the crown height and shape of the rolled sheet, the rolling method used is to change the rolling force at the start of the rolling and the completion of the rolling by using the increasing bending device with a high degree of resilience as a work roll bending force. Bending force. 201139001 High-response incremental bending device can compensate (compensate) the declining curve (4) set the deer and then (4) material side material thickness or _ material rolling changes, the high-response incremental f-device control can form a good The rolled plate has a high crown shape and can significantly improve the product and productivity. For example, the Xingkun rolling mill shown in the figure is based on the ease of disassembly and assembly of the piping during the changeover. Therefore, the hydraulic piping of the declining bending device is a flexible piping that is flexible and disassembled. Therefore, the responsiveness of the rolling mill with the decreasing bending device is inevitably lower than the responsiveness of the incremental bending device. However, the structure of the Wei machine is such that the incremental bending device is disposed on the protruding block, so that the incremental bending device can be disposed in the protruding block, and the oil pressure control valve can be connected by the fixed installation hydraulic pressure. The excellent characteristics of the incremental bending device with high responsivity are formed. Therefore, the above-described high-response roll bending force control can be achieved. Based on the above findings, the inventors of the present invention have completed the invention of a rolling method for a metal sheet, which can impart a high response to the crown height of the rolling sheet even if the resilience of the bending device is lower than that of the incremental bending device. • Shape control function. The gist of the following is as follows. (1) A method of rolling a metal sheet by a rolling mill having an incremental bending device for generating an increasing bending force, and a decreasing bending device for generating a decreasing bending force, and the aforementioned decreasing The responsiveness of the bending device is lower than that of the incremental bending device described above; it is characterized in that both the incremental bending force and the decreasing bending force 201139001 are applied before the start of the rolling, and the resultant force is the phase and the four-roller bearing seat. After the bending force of Tian and Yu Hengli acts on the work, the force of the decreasing bending force is changed. The surface changes the curvature of the ridge. The bending force of the pre-twisting Wei rolling maintains the bending force of the roller. If this step is: reduce the bending force and the 増 増 f 力 辊 辊 辊 递 递 ( 四 四 四 四 四 四 四 四 四 ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' . After the combined force forms the bending force, at the beginning of the rolling, the predetermined bending force is continuously reduced in the rolling, and the bending force is maintained in the above-mentioned predetermined rolling work roll f force and the action # 曲曲's force is the pre-parent In the rolling, the work is carried out by controlling the incremental bending force to rotate the fine bearing. In the rolling work, after the rolling is performed, the pro-rolling is performed to maintain the predetermined roller, and when the rolling is completed, the force of the bending force is changed to be equivalent. In view of the balance force, the surface of the material is reduced by the curved seat' and in this state, the rolling of the sheet metal village is finished. After the work is used for the bearing, in order to maintain the above-mentioned resultant force, the curvature is increased and the f-force is increased. 'Reducing the decreasing bending force in the decreasing bending, and increasing the bending force == the force is the predetermined roller to reach the decreasing bending force and the increasing bending force into the work roll bearing seat, the state can also be omitted. $ Acoustic force (2) The method for rolling a metal sheet according to (1), wherein the roller machine has at least a pair of upper and lower guards, which are carried out by means of a roller (four), and the sheet bundle and the pair respectively support the upper and lower support rollers of the roller, and Composition, D•"Temple and work The roller corresponds to the incremental hydraulic cylinder of the incremental bending device of the previous 201139001, and the hydraulic pressure control valve is connected by a fixed hydraulic pressure pipe and is inserted into the protruding block protruding toward the inner side of the rolling mill frame; The descending hydraulic cylinder of the aforementioned decreasing bending device corresponding to the work is connected to the oil pressure control valve by a hydraulic pipe which is flexible and detachable, and is mounted in the upper support bearing housing. (3) as (2) The rolling method of the metal plate is to measure the oil pressure in the hydraulic pipe connected to the hydraulic cylinder or the hydraulic cylinder connected to the oil pressure cylinder and control the increasing bending force according to the measured value to make the light acting on the working bearing housing The bending force reaches a predetermined value. The predetermined value of the so-called bending force is a value of the bending force of the roller which is obtained in advance by rolling conditions, etc. Further, the bending force acting on the roller of the work roll is an increasing bending force and a decreasing bending. Advantageous Effects of the Invention The rolling method of the present invention is a change in the bending force of the roll at the start of the rolling and at the completion of the rolling by the incremental bending device having a high degree of responsivity. The ease of disassembly and assembly of the piping is such that the hydraulic piping of the decreasing bending device adopts a hydraulic pipe which is flexible and freely detachable, so that the rolling mill is more responsive than the incremental bending device in response to the decreasing bending device. The high-response incremental bending device can also compensate the responsiveness of the decreasing bending device, thereby imparting a high-response and strong rolling plate crown height and shape control function. It is by the rolling method of the present invention, even if facing the rolled material. The interference caused by the variation of the feeding side plate thickness or the rolling material temperature can still form a 9 201139001 good rolling plate crown height and shape, and can greatly improve the product quality and yield rate. Figure 1 shows the system A side view of a structural example of a rolling mill of the object of the present invention. Fig. 2 is an example of an operation flow of the rolling method of the present invention. Fig. 3 is a drawing showing the bending force of the lower part of the operation flow of Fig. 2. Time series changes. The figure shown in Fig. 4 is a time series change of the roll bending force or the like when the resilience of the decreasing bending device is low. The figure shown in Fig. 5 is another example of the operation flow of the rolling method of the present invention. The figure shown in Fig. 6 is a time series change of the bending force of the roller, etc. in the operation flow of Fig. 5. Fig. 7 is a side view showing another configuration example of the rolling mill of the object of the present invention. Fig. 8 is a side view showing another configuration example of the rolling mill of the object of the present invention. I: Embodiment 3 Model for Carrying Out the Invention The rolling method of the present invention will be described below with reference to Figs. 1 to 8 . Fig. 1 is a side view showing a structural example of a rolling mill of the object of the present invention, and the rolling mill is taken as an example for description. As shown in the figure, the rolling mill of the object of the present invention has a pair of upper and lower work rolls 1-2, 1-2 and a plurality of sections for supporting the pair of support rolls 2 - 2 - 2 above the work rolls, respectively. Rolling mill. In addition, the rolling mill shown in the figure is a four-stage rolling mill in the form of a tandem finishing mill such as a thin steel strip, but is not limited thereto, and a six-stage rolling mill is also possible. In the rolling mill, the protruding blocks 5-1, 5-2 protruding toward the inner side of the frame 9 are loaded with an incremental bending device 6-1, 6-2 for increasing the load of the upper work roll 1-1. And the bending device 6-3, 64 is incremented under the increasing bending force for the lower work roll μ2 load. Therefore, the work rolls 1_1, 1-2 will cause wear under the rolling operation, so the rolls must be changed during the flood season. However, the pro-rolling mill of Fig. 1 does not need to disassemble the hydraulic piping of the transfer bending device when changing the light work. Each of the incremental bending devices 6-1 to 6-4 can be connected to each of the hydraulic control valves by a fixedly mounted hydraulic pressure pipe, so that a servo for high-response hydraulic pressure control can be used, thereby forming a responsivity. High-handed bending device. In addition, it is used to reduce the bending force above the working load of the relatives, and the ridge device 7_1, 7-2 is attached to the upper support 4] for lowering the bending force under the lower work roll load. The curved devices 7_3, 7_4 are fitted into the lower support roll chock 4-2. Although the part of the yb 2_2 is not as good as the work roll, it will still cause loss under the rolling operation. Therefore, the roll changer is required to be disassembled and depressurized during the roll change operation. 7-4 oil position piping, so that the possibility of tiny foreign objects in the hydraulic piping during assembly and disassembly is increased. Therefore, it is difficult for each of the decreasing bending devices 7] to 7_4 to use a servo valve for performing high plastic pressure control. Moreover, by the flexibility of the u. ^ re special flexible structure and the disassembly and assembly of the hydraulic pressure distribution and the connection of the various hydraulic pressure control cores, it is easy to disassemble the assembly tube, because of the flexible structure, there is a change in the absorption oil pressure. The case of attenuation. 201139001 疋x is based on the ease of disassembly and assembly of the pipe when changing the roll. When the flexible pipe is used by the pressure pipe without the servo valve, the responsiveness of the decreasing bending device will be lower than that of the incremental bending I. Responsiveness. Therefore, in order to control the crown height and shape of the rolled sheet, a decremental f-curvature action is generated. As a work roll phase force, it is difficult to rapidly change the setting during the pro-rolling. Therefore, it is impossible to carry out appropriate roll bending control for the dry-bending of the pure rolled material such as the side thickness of the material or the temperature of the rolled material, so that the quality of the product or the yield is lowered. On the other hand, the load cannot be decremented when the idling load of the rolling load has not been applied. 4 curvature. When the decreasing bending force is applied, it is necessary to quickly switch from the roller balance state at the start of rolling to the decreasing bending force at the start of the rolling, and then quickly return the roller balance state at the completion of the rolling. Therefore, if the bending force is controlled by the decreasing bending device of the responsiveness difference, the leading end of the rolled material may be decremented by the predetermined load, so that the shape defect portion is increased. Among them, the roll bending device disclosed in Patent Document 2 determines the responsiveness of the roll bending device by the secondary pipe length of the servo valve. That is, the length of the piping from the servo valve to the hydraulic cylinder is shortened to within 2 m, and the servo valve controls the difference between the oil pressure on the increasing side and the oil pressure on the decreasing side to ensure high responsiveness of the bending force. However, the work of changing the work rolls or the support rolls must be carried out periodically, so it is impractical to make both the incremental side and the decreasing side of the fixed hydraulic piping. Therefore, the problem of the present invention for improving the responsivity when the decreasing bending action is generated cannot be sufficiently solved. The rolling method of the present invention also solves the problem of Patent Document 2. 5 201139001 In addition, the incremental bending device refers to a hydraulic device for applying a force in the direction of the roll gap to the work roll housing. The so-called incremental bending device is a general term for a device including an actuator thereof, that is, a hydraulic cylinder. DETAILED DESCRIPTION OF THE INVENTION For the sake of simplicity, the so-called incremental bending device refers to its actuator, i.e., a hydraulic cylinder, unless otherwise noted. And the force that loads the incremental bending device onto the work roll is referred to as the incremental bending force. On the contrary, the hydraulic device for applying the force in the direction of the roll gap to the work roll bearing seat is called a decreasing bending device, and the force for loading it on the work roll is called a decreasing bending force. However, the present invention is intended to simplify the description, and the declining bending device is referred to as an actuator, i.e., a hydraulic cylinder, unless otherwise specified. The figure shown in Fig. 2 is an example of the operation flow of the rolling method of the present invention, and more specifically, the operation flow of the incremental bending device having a high degree of responsivity and the decreasing bending device having a slightly lower response degree. Further, Fig. 3 is a view showing a time-series change of the roll bending force or the like which is caused by the rolling operation of one of the rolled materials under the rolling method. In Fig. 3, the time series change of the rolling load, the output of the incremental bending device, the output of the decreasing bending device, and the working bending force of the resultant force are displayed from top to bottom. The following description will be made based on the second and third figures. First, before the start of the rolling, the setting calculation of the rolling material corresponding to the subsequent rolling is performed, and the set value FR of the bending force of the work roll is calculated and output. Among them, the FR calculus yields a negative value, that is, the bending force is decremented. Further, in the present invention, the roll bending force defines an increasing bending force (the force in the increasing direction (the direction in which the roller is pulled)) as a positive value, and decrements the bending force (the direction in which the direction of the roller is depressed) Defined as a negative value. 13 201139001 Before the start of rolling, the incremental bending force and the decreasing bending force are combined to be the incremental side roller bending force equivalent to the roller balance force (Fb) and used as the roller bearing housing. That is, when idling before rolling, it is assumed that the incremental bending device wheel 0) decreases the output of the f-curve device to 〇8 (<〇), and Ib+Db forms the rotational balancing force to 〉 0) 0 and another 'reports the balance force FB. It is determined that the rolling machine under the idling state accelerates and decelerates 'the force of the work roller driven by the motor and the passive support roller does not slide'. In addition, the actuator of the decreasing bending device does not deviate from the working roller bearing housing. The oil pressure can be set. Then, at some point before the start of the rolling (point a on the time axis), the output of the decreasing bending device Ds of the predetermined rolling which is sufficient to produce the bending force FR of the work rolls in the rolling is calculated by the Ds = Fr_Ir2 formula. . At the same time, Ds and Is are outputted so that the roller balance force (Fb) reaches a certain level. Among them, Ir is the incremental bending device output in the rolling, and it is determined in advance that the absolute value of the near controllable value is not excessively large, and Is is set to the output of the twisting device of is + ds=fb. Therefore, the work force f of the work roll at the time of ’ is still maintained in the state of Fb, and there is no substantial change. After the person starts to roll, continue to control the decreasing bending force to maintain a certain value while reducing the incremental f-curvature, and work together to form the rolling force of the roller f on the predetermined decreasing side and act on the work roll bearing housing to perform rolling. . The start time of the rolling (the point on the time axis), the output of the incremental bending device is changed from Is, Xiaowen Feng IR. In this way, in the state of the slow-reducing bending device 201139001: in the state of maintaining Ds, the control bending force of the resultant force is rapidly cut by the balance force fb (> 〇) by the control of the fast-increasing response device. ^ To reduce the bending force fr(<0). At the beginning of the other roller (8), the time point at which the light drying starts is started. The method of:: the system, for example, the load detected by the roller (4) of the setting of the roller dryer is more than the setting calculation. The view of the predicted calculus is dry. For example, the method of 3G% can be used. This value should be set between 10 and 3〇%. This is different from the balance of the roller (4) and can quickly detect the start of rolling. After the completion of the rolling, the rolling force of the roller f is restored to the shape before the start of the rolling, and the 'recombination force is the rolling material force corresponding to the rolling side of the balancing force of the roller and acts on the working bearing housing, and In the state, the roll of the metal sheet is finished. That is, at the time of completion of the rolling (point on the time axis), in the state where the output of the bending device is decreased by _Ds, the output of the fast response is reverted from h to Is. In this way, the resultant work roll f-mechanism can be quickly switched from the decreasing bending force FR (<0) to the roll balance force Fb (> 〇). In addition, the time when the roll is completed (time_upper) means when the roll is finished. (4) Inspection of the engraving The dynamometer for measuring the rolling load of the rolling mill is determined by the method of the time series average value of the actual rolling load in the rolling. This value can be arbitrarily set, but should be set between 50 and 80%. This can be distinguished from the variation of the bending force of the stick in (4), and the rolling can be quickly detected.
之後將輥軋完畢時刻經過例如！〜3秒後之時間點設為 作業完畢時刻d，於該時刻，將遞增彎曲裝置輪出設為I 15 201139001 將遞減彎曲裝置輪出嘹 彎曲力大致維持為財衡&在此變更下，合力之工作輥 如第2圖、第3圖所示: 罢w山& 本發明之輥軋方法中係利用配 置於突出塊之響庫声古 細和—田士 、又遞増彎曲裝置變更輥軋開始時及 輥軋完畢時之輥彎曲力。 说嫩固此，於勢須配備響應度低於遞 增彎曲裝置之遞減彎曲奘 本·置時，響應度高之遞增彎曲裝置 亦將補償該差異，因此可 Ί Η予高響應且強力之軋板冠高· 形狀控制機能》 進而幸昆軋中因種種要因（干擾)改變輥軋力時 ’仍可藉 由高響應之遞增彎曲裝置迅速控制，維持最佳^彎曲力。 即藉由本發明之挺軋方法，即使面對觀札材料入料 側板厚缝軋材料溫度等⑽[中會變動之干擾，亦可形成 良好之軋板冠高•形狀，並可大幅改善製品品質及良品率。 第4圖所示者係遞減彎曲裝置之響應度低時(特別是具 有若反作用力消失則壓力下降之油壓特性時）輥彎曲力等 之時間序列變化。如同第3圖，顯示隨著第2圖所示之遞増 彎曲裝置與遞減彎曲裝置之操作流程，對—根輥軋材料進 行輥軋運轉時相伴而生之輥彎曲力等之時間序列變化。 即’顯示遞減彎曲裝置之響應度較第2圖、第3圖慢者之例。 如此例所示，遞減彎曲裝置之響應度低時，響鹿斤言 之遞增彎曲裝置於時刻b及c急遽變化，故響應度差之遞減 彎曲裝置之輸出將產生變動。結果，合力之工作親彎曲力 於時刻b延遲到達Fr，且於時刻c延遲到達FB。第5圖所示之 輥軋方法即用以解決此一問題。 16 201139001 顯』=示？本發明之嫩法之操作流程另-例， 之遞曲裝置與響應度低於第2圖、細時 塗 之操作流程。以下根據關進行說明。 之油髮不之輕乾方法係依據測量遞減'彎曲裝置相連 之挪力^測ί祕所得之遞減彎曲力、或設於該裝置中 遞減彎曲彎曲力控制遞增f曲裝置。即，依 裝置之油屡控制遞增彎曲裝置之輸 工C彎曲力達輥平衡力匕，並使輥軋中 法。 R 3，其他控制同於第2圖所示之輥軋方 遞增之輥軋方法進行喊，即如_所示， 弯曲^ 償遞減f曲裝置之輸出變動，且工作輥 力貫現高響應之控制。 量進二’即使不測量輥軋中之遞減彎曲力、或不藉油壓測 變動订回=制’亦可藉由事先預測遞減彎曲裝置之輸出 到同樣^定用以補償該變動之遞增彎曲裝置之輸出，得 第7圖及第8圖係顯示本發明目的物之輕軋機之另一構 =之側視圖。該等親軋機業已改良成可由機架窗12承受 非倾w之本體部之輥軋方向力以增 非错由突出塊5_卜5·2。 其中第7圖所示之棍軋機係於下支樓觀轴承座η配備 7 / 了Ζ工作觀1-2負載遞減彎曲力之下遞減彎曲裝置 7 4者。第8圖所示之輥軋機係將下遞減彎曲裝置7_3、 17 201139001 7-4配置於位在突出塊5_卜5_2下方之專用突出塊5_3、5_4者。 該等輥軋機均適用本發明之輥軋方法，因此面對親札 材料入料側板厚或輥軋材料溫度等輥軋中會變動之干柃仍 可形成良好之軋板冠高•形狀，可大幅改善製品品質及良 品率。 產業上之可利用性 本發明可運用於鋼板之輥軋上，特別是需要大輥縫之 玎逆式輥軋機等。 【圖式簡單說明】 視圖 第1圖係顯示本發明目的物之輥軋機之-構造例之側 第2圖所示者係本發明之親札方法之操作流程一例。 序列變化 第3圖所不者係第2圖之操作流程下輕彎曲力等之時間 ^圖所示者係遞減彎曲裝置之響應度低時輥脊曲力 等之時間序列變化。 彎曲力等之時間 示者係本發明之觀軋方法之操作流程另一例。 第圖所示者係第5圖之操作流程下輥 序列變化。 第7圖係顯示本發明曰μ n 側視圖 +㈣目的物之輥軋機之另—構造例之 側視圖 Γ圖係顯示本發明目的物之輥軋機之另一構造例之 明 主要元件符號說 201139001 1-1...上工作輥 1- 2...下工作輥 2- 1...上支撐輥 2- 2...下支撐輥 3- 1...上工作輥軸承座 3- 2...下工作輥軸承座 4- 1...上支撐輥軸承座 4- 2...下支撐輥軸承座 5- 1...入料側突出塊 5-2...出料側突出塊 5-3...入料側下突出塊 5- 4...出料側下突出塊 6- 1...入料側上遞增彎曲裝置 6-2...出料側上遞增彎曲裝置 6-3...入料側下遞增彎曲裝置 6- 4...出料側下遞增彎曲裝置 7- 1...入料側上遞減彎曲裝置 7-2...出料側上遞減彎曲裝置 7-3...入料側下遞減彎曲裝置 7- 4...出料側下遞減彎曲裝置 8- 1...入料側支撐輥平衡裝置 8-2...出料側支撐輥平衡裝置 9.. .機架 10.. .棍軋材料 11.. .壓下裝置 12.. .機架窗 19After that, the rolling is completed, for example, after! The time point after ~3 seconds is set as the operation completion time d. At this time, the incremental bending device is set to I 15 201139001. The decreasing bending device wheel bending force is maintained as the balance & The working rolls of the resultant force are as shown in Fig. 2 and Fig. 3: The rolling method of the present invention is changed in the rolling method of the present invention by using the sounding of the sounding of the protruding block and the change of the Roll bending force at the start of rolling and at the end of rolling. When it is said that the responsiveness is lower than that of the incremental bending device, the incremental bending device with high responsiveness will compensate for the difference, so that the high-response and strong rolling plate can be compensated. Crown height · shape control function" In addition, due to various factors (interference) in the rolling, the force can be quickly controlled by the high-response incremental bending device to maintain the best bending force. That is, by the rough rolling method of the present invention, even in the face of the temperature of the material of the material side of the material, such as the thickness of the material, the surface of the material can be formed into a good crown height and shape, and the quality of the product can be greatly improved. And the yield rate. The figure shown in Fig. 4 is a time-series change in the bending force of the roller, etc. when the resilience of the decreasing bending device is low (especially when the hydraulic pressure characteristic is lowered if the reaction force disappears). As shown in Fig. 3, a time-series change of the roll bending force accompanying the rolling operation of the root rolling material is shown in the operation flow of the progressive bending device and the decreasing bending device shown in Fig. 2. That is, the example in which the responsiveness of the decreasing bending device is slower than that of Figs. 2 and 3 is shown. As shown in this example, when the resilience of the declining bending device is low, the incremental bending device of the deer is changing rapidly at times b and c, so that the output of the declining responsiveness of the declining device will vary. As a result, the resultant work force bending force reaches Fr at time b, and arrives at FB at time c. The rolling method shown in Fig. 5 is used to solve this problem. 16 201139001 显』=示? In the operation flow of the tender method of the present invention, the recursive device and the responsivity are lower than the operation flow of the second drawing and the fine coating. The following is explained according to the customs. The method of lightly drying the oil is based on the measurement of the decreasing amount of the bending force connected to the bending device, the decreasing bending force obtained by the measurement, or the decreasing bending bending force in the device to control the incremental bending device. That is, the oil C bending force of the incremental bending device is controlled by the oil of the device to reach the roller balance force 匕, and the rolling method is performed. R 3, the other control is the same as the rolling method in which the rolling method shown in FIG. 2 is incremented, that is, as shown in _, the bending is compensated for the output variation of the device, and the work roll force is high and the response is high. control. The amount of the second 'even if the rolling force is not measured in the rolling, or the oil pressure is not adjusted by the oil pressure change = the system can also be predicted by decreasing the output of the bending device to the same incremental adjustment to compensate for the variation The output of the apparatus, Fig. 7 and Fig. 8 are side views showing another configuration of the light rolling mill of the object of the present invention. These pro-rolling mills have been modified to be able to withstand the rolling direction force of the body portion of the non-tilted body by the frame window 12 to increase the error by the protruding block 5_b5.2. The stick rolling mill shown in Fig. 7 is attached to the lower bearing tower bearing housing η equipped with 7 / Ζ working view 1-2 load decreasing bending force under the downward bending device 7 4 . The rolling mill shown in Fig. 8 arranges the lower and lower bending devices 7_3, 17 201139001 7-4 in the dedicated protruding blocks 5_3, 5_4 located below the protruding blocks 5_b 5_2. The rolling mills of the present invention are all applicable to the rolling method of the present invention. Therefore, the dryness of the rolling sheet which is changed in the rolling sheet thickness of the material side of the material or the temperature of the rolling material can form a good crown height and shape. Significantly improve product quality and yield. Industrial Applicability The present invention can be applied to the rolling of steel sheets, in particular, a hob rolling mill requiring a large roll gap. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a structure of a rolling mill of the object of the present invention. FIG. 2 is an example of an operation flow of the method of the present invention. Sequence change Figure 3 is the time of the light bending force in the operation flow of Fig. 2. The figure shows the time series change of the roll curvature and the like when the resilience of the bending device is low. The time of the bending force or the like is another example of the operation flow of the rolling method of the present invention. The figure shown in the figure is the change of the roller sequence in the operation flow of Figure 5. Fig. 7 is a side view showing another embodiment of a rolling mill of the present invention, which is a side view of a side view + (4) object, and shows another structural example of a rolling mill of the object of the present invention. 1-1... Upper work roll 1 - 2... Lower work roll 2 - 1... Upper support roll 2 - 2... Lower support roll 3 - 1... Upper work roll chock 3 - 2 ... lower work roll chock 4 - 1... upper support roll chock 4 - 2... lower support roll chock 5 - 1... feed side protruding block 5-2... discharge side Projection block 5-3... Feeding side lower protruding block 5-4... Discharge side lower protruding block 6-1... Incremental bending device 6-2 on the feeding side...Incremental on the discharge side Bending device 6-3...feeding side lower incremental bending device 6-4...feeding side lower incremental bending device 7-1...feeding side upper decreasing bending device 7-2... discharging side Upper decreasing bending device 7-3...feeding side lower decreasing bending device 7-4... discharging side lower decreasing bending device 8-1...feeding side supporting roller balancing device 8-2...out Material side support roller balancing device 9... Rack 10... Rolling material 11... Pressing device 12.. Rack window 19