201201919 六、發明說明 【發明所屬之技術領域】 本發明係關於用於薄板的軋製等的多級軋製機。 【先前技術】 眾所周知’在對不銹鋼、鈦'特殊鋼、銅等軋製材料 進行冷軋時，使用多級軋製機。作爲多級軋製機，一般使 用支撐工作輥的輥群像一串葡萄那樣呈扇形擴展的“群集 型的多級軋製機”。 作爲支撐該工作輥的輥群，是包含支承輥和中間輥， 根據用於群集型的多級軋製機的輥的數量，12級、μ 級、20級等的種類是已知的。根據如下的理由而將群集 型的多級軋製機分成這樣的級數》 在群集型的多級軋製機中，在軋製材料的表面和背 面，通常具備對該軋製材料進行軋製的上下一對工作輥。 而且，支撐該工作輥的輥群分別配備在工作輥的上側和下 側。關於該輥群，例如僅著眼於上側的輥群，爲了防止內 側的輥的撓曲而設置外側的輥，因而例如以在上側的工作 輥的外側（上側）附近爲2根，在更外側（上側）爲3根的方 式隨著從工作輥離開而使所配備的輥的數量逐漸增加， 又，一般而言，外側的輥的輥徑比內側的輥更大。 如圖4(a)所示，如果將工作輥105的上側附近的中間 輥106作爲驅動輥，在該中間輥的上側配備3根支承輥 108的話，就成爲12級的多級軋製機。又，如圖4(b)所 201201919 示，如果在中間輥（驅動輥）1〇6的上側配備4根支承輥 108的話，就成爲14級的多級軋製機。另一方面，如果 將在配備於工作輥的外側附近的2根第1中間輥的上側所 配備的3根第2中間輥中的兩端的2根作爲驅動輥，在這 3根第2中間輥的上側配備4根支承輥的話，就成爲如圖 4(d)那樣的20級的多級軋製機。 作爲上述1 2級的多級軋製機，“ R&D神戶製鋼技報 Vol.58 Νο·2，2008年8月發行（參照KT軋機（12級軋機） 和KST軋機（20級軋機））”所記載的ΚΤ軋機是已知的， 又作爲14級的多級軋製機，日本特開2004-1 36328號所 記載的軋製機是已知的，而且作爲20級的多級軋製機， 上述文獻所記載的KST軋機是已知的。 【發明內容】 可是，近來對於由多級軋製機生產的薄板製品的軋製 形狀的精度的要求逐年變嚴格，有重視多級軋製機的形狀 控制性能的傾向》關於多級軋製機的形狀控制致動器的構 造和性能，例如揭露在上述文獻的1 4頁〜1 5頁。 特別是，在將支承輥作爲形狀控制致動器來使用的情 況，是經由中間輥、工作輥來控制軋製材料的形狀。 爲了使形狀控制性良好，較佳爲減少介於中間的輥間 的接觸所導致的輥扁平變形的影響少。因此，由於介於其 間的中間輥的級數少，因而像1 2級軋製機和1 4級軋製機 那樣從支承輥經由中間輥、工作輥而控制軋製材料的形狀 201201919 的情況，相較於像20級軋製機那樣從支承輥經由第2中 間輥、第1中間輥、工作輥而控制軋製材料的形狀的情 況，輥扁平變形的影響少，形狀控制的效果大。 可是，關於需要高的軋製轉矩的硬質材料的寬幅軋 製，基於驅動輥之間的空間的關係，使得20級軋製機能 夠比12級軋製機和14級軋製機傳遞更高的轉矩，因而能 夠確保高的生產性而有利。 如果將使用相同輥徑的工作輥的20級軋製機和12 級、14級軋製機相比，在20級軋製機中，兩側的第2中 間輥成爲驅動輥，相對於此，在12級、14級軋製機中， 工作輥的外側附近的中間輥成爲驅動輥，與20級軋製機 相比，驅動輥間的間隔於上下方向和左右方向均較小（例 如，參照本說明書的圖4)。 結果，在驅動輥間的間隔窄的1 2級和1 4級軋製機 中，受到驅動輥的驅動系統之設置空間的限制，難以傳遞 與20級軋製機同等的驅動轉矩。 在1 2級和1 4級軋製機中，爲了增大傳遞驅動轉矩， 例如，有改變傳遞驅動轉矩的萬向接軸的交叉部的板寬方 向（本說明書的圖5的橫方向）的位置而採用更大尺寸的萬 ' 向接軸的情況，但即使使用該方法，傳遞驅動轉矩也不及 20級軋製機。 因此，在欲以每1道次25%的程度以上的高減縮比對 例如1300~1600mm的寬幅且4~5mm的板厚較厚的硬質不 銹鋼材料（硬質寬幅材料）進行軋製的情況，是犧牲形狀控 201201919 制性而使用20級軋製機。 本發明是鑒於上述問題點而開發完成的，其目的在於 提供一種多級軋製機，該多級軋製機具有與12級、14級 軋製機同等的良好的形狀控制能力，而且，具有與20級 軋製機同等或更高的驅動轉矩。 爲了達成上述目的，本發明的多級軋製機採用以下的 技術手段。 本發明的多級軋製機，由以下構件構成：上下一對的 工作輥，對軋製材料進行軋製；上下各2根的第1中間 輥，以與前述工作輥接觸的方式配備在前述工作輥的外 側：上下各3根的輥，以與前述第1中間輥接觸的方式配 備在前述第1中間輥的外側，在此，前述3根輥中的中央 的輥是作爲驅動輥的第2中間輥，兩端的2根輥是支撐前 述第1中間輥的第1支承輥：以及上下各1根以上的第2 声承輥，以支撐前述第2中間輥的方式配備在前述第2中 間輥的外側。 本發明人考慮到，不是將配備在工作輥的外側的2根 輥作爲驅動輥，而是將配備在這2根輥的更外側的3根輥 的任一個作爲驅動輥而進行驅動。而且認識到將3根輥中 的中央的輥驅動，並且在該被驅動的輥設置支承輥，藉此 能夠兼顧生產性和形狀控制性能而完成本發明。 即，在習知12級軋製機、14級軋製機中，是將4根 第1中間輥作爲驅動輥，但藉由使驅動輥爲2根第2中間 輥，使得驅動輥間的間隔在上下方向變大，又藉由使在左 -8 - 201201919 右方向使用上2根、下2根的驅動輥成爲上1根、下1 根，在左右方向也能夠確保充分的空間，因而能夠採用擺 動直徑大的萬向接軸。因此，能夠附加與20級軋製機同 等或更髙的驅動轉矩。 如果驅動12級軋製機的中央的支承輥，雖能夠得到 與上述多級軋製機相同的驅動轉矩，但在這種情況爲了進 行驅動，12級軋製機的中央的支承輥不可採用由多個軸 承和鞍座構成的板寬方向分割式的輥，而必須採用與12 級軋製機的中間輥相同之一體物的輥。 在這樣的情況，由於中央部的支承輥不是由多個鞍座 沿板寬方向支撐在殼體，因而工作輥撓曲大，變得難以得 到良好的板形狀。由於支承輥是分割輥，且分割輥所具備 的鞍座是沿板寬方向被支撐在殼體，因而多級軋製機的工 作輥撓曲小，關於這一點，例如揭露在“ R&D神戶製鋼 技報 Vol.59 No.2，2009年8月發行”的60頁〜61頁。 又，第1中間輥的外側附近的3根輥中的兩側的2根 第1支承輥是與習知12級、14級軋製機的支承輥採用相 同的構造，藉此能夠在本發明的多級軋製機也設置作爲形 狀控制致動器的凸度調整裝置，因而能夠堅持12級、14 級軋製機所具備的良好的形狀控制性。 此外，在上述多級軋製機，爲了將第2中間輥作爲驅 動輥，是使第2中間輥成爲一體物的輥，因而必須在第2 中間輥的外側設置由多個軸承和鞍座構成的板寬方向分割 式的第2支承輥，使工作輥撓曲最小化。 -9 - 201201919 能夠使用在上述第2中間輥的外側分別具備各2根第 2支承輥而構成爲16級的多級軋製機。 又，能夠使用在上述第2中間輥的外側分別具備各1 根上述第2支承輥而構成爲1 4級的多級軋製機。 藉由使用本發明的多級軋製機，即使是上述的硬質寬 幅材料，也能夠維持習知1 2級、1 4級軋製機的形狀控制 性，且具有與20級軋製機同等或更高的驅動轉矩，而對 硬質寬幅材料以高減縮比進行軋製。 【實施方式】 以下，基於附圖，說明本發明的多級軋製機1的本實 施方式。 首先，以下，舉例說明設有多級軋製機1的軋製裝置 2 ’詳細地說明本發明的多級軋製機1。 如圖1所示，軋製裝置2具有將所軋製的軋製材料W 進行捲放的捲放部3和對所軋製的軋製材料W進行捲繞 的捲繞部4，在捲放部3和捲繞部4之間，設有對軋製材 料W進行軋製的多級軋製機1。該軋製裝置2能夠將板通 過方向進行正反切換（使板通過方向在圖1的塗黑箭頭和 空白箭頭之間反轉），而對軋製材料W進行反向軋製。 如圖2所示，本發明的多級軋製機1，是將工作輥 5、第2中間輥（驅動輥）6、第1中間輥7以及支承輥8予 以多根組合而構成，將多根輥組合的樣子看起來正好像一 串葡萄，因而被稱爲群集型的多級軋製機，適用在對由不 -10- 201201919 錄鋼、鈦、特殊鋼、銅等構成的板狀的軋製材料W進行 軋製加工時。 此外，以圖2的紙面上的上下作爲說明多級軋製機1 時的上下。又，以圖2的紙面上的左右作爲說明多級軋製 機1時的左右》這些方向與從驅動側（drive side)觀看多級 軋製機1時的方向一致。又，在以下的說明中，對相同的 構件標記相同的符號。這些構件的名稱和功能也相同。所 以，不重複關於這些構件的詳細的說明。 首先，對構成多級軋製機1的各輥進行說明。 在多級軋製機1，以沿上下方向的中央水平地移送的 軋製材料W爲基準，以在軋製材料W的上側和下側互相 成爲鏡像（對稱）的配置而具備多根輥（以下，將這些多根 輥稱爲輥群9)。於是，在以下的說明中，以上側的輥群9 爲代表例而說明構成輥群的各輥。 上側的輥群9由1根工作輥5 ' 2根第1中間輥7、1 根第2中間輥（驅動輥）6以及4根支承輥8構成，本實施 方式的多級軋製機1成爲1 6級構成。 如圖2所示，工作輥5是直徑比其他輥小的輥，如果 是對不銹鋼的軋製材料W進行冷軋的設備的情況，則形 '成爲20〜ΙΟΟιηιηφ左右的直徑。工作輥5由上下一對構 成，將軋製材料W夾入輥間並施加軋製負荷。 第1中間輥7 L、7R是與工作輥5的左上側和右上側 (外側）鄰接而配備的輥，互相隔開距離而配備有2根。第 1中間輥7L、7R是直徑大於工作輥5的輥，配置成外周 -11 - 201201919 面分別與工作輥5的外周面接觸。在第1中間輥7L、7R 的上側，配備有第2中間輥（驅動輥）6，能夠經由該第1 中間輥7L、7R而將第2中間輥（驅動輥）6的驅動力傳遞 至工作輥5 » 第2中間輥（驅動輥）6以與左右的第1中間輥7L、7R 分別接觸的方式在從左側的中間輥7L觀看時配備在右上 側，在從右側的中間輥7R觀看時配置在左上側，在各輥 群9各設有1根。第2中間輥（驅動輥）6是直徑比第1中 間輥7L、7R更大的輥，設置成可繞軸心旋轉自如。第2 中間輥（驅動輥）6在軸端部連結圖中未顯示的萬向接軸， 成爲能夠利用由電動機產生的驅動力來驅動旋轉的構造。 以上述的工作輥5爲基準，在第2中間輥（驅動輥）6 和第1中間輥7L、7R的更外側，配備有支撐這些輥的支 承輥8。支承輥8係包含：支撐第1中間輥7的第1支承 輥10L、10R和支撐第2中間輥（驅動輥）6的第2支承輥 1 1 L、1 1 R。 第1支承輥10L、10R是在從左側的中間輥7L觀看 時配備在左上側，在從右側的第1中間輥7R觀看時配備 在右上側的輥，均形成爲比第1中間輥7L、7R更大的直 徑。這些第1支承輥l〇L、10R從第2中間輥（驅動輥）6 隔開距離而配備，形成在左側的第1支承輥10L和第2中 間輥（驅動輥）6之間的間隔設定爲與形成在右側的第1支 承輥1 0R和第2中間輥（驅動輥）6之間的間隔大致相同。 而且，左側的第1支承輥1 0L與左側的第1中間輥7L抵 -12- 201201919 接，同時，右側的第1支承輥1 OR與右側的第1中間輥 7R抵接，成爲分別能夠從上方壓緊並支撐第1中間輥 7L、7R的構造》 第2支承輥11L、11R在從第2中間輥（驅動輥）6觀 看時分別配備在左上側和右上側。這些第2支承輥1 1 L、 1 1 R分別與第2中間輥（驅動輥）6的上側接觸，以從上方 壓緊的方式支撐第2中間輥（驅動輥）6。 接著，加入與圖4〜圖5所示的習知多級軋製機i的 對比，說明本發明的多級軋製機所具備的作用效果。此 外，以下所說明的作用效果均是具備相同直徑的工作輥的 多級軋製機彼此相比的情況的作用效果，圖4所示的12 級、1 4級以及20級的多級軋製機均具備直徑與本發明的 多級軋製機1相同的工作輥。 例如，在圖4(a)所示的12級的多級軋製機1〇1中， 在工作輥1 05的外側附近配置有2根中間輥1 06，該2根 中間輥106的外側爲3根支承輥108。又，在圖4(b)所示 的14級的多級乳製機101中，雖然支承輥108爲4根， 但共同點在於，在工作輥1 05的外側附近設有2根中間輕 1 06，均以工作輥1 05的外側附近的中間輥1 〇6作爲驅動 輥而進行驅動。 當然，在這樣地以工作輥105的外側附近的中間輥 106作爲驅動輕而進丨了驅動的構造’驅動輕間的間隔容易 在上下方向和左右方向變小。例如，如果以驅動輥之間的 上下方向的間隔爲例，其等的間隔L2、L3非常小。由於 13- 201201919 在這些成爲驅動輥的中間輥106的軸端部設有將驅動力傳 遞至中間輥106的萬向接軸，如果欲使萬向接軸彼此如上 述般在窄的間隔L2、L3內旋轉，相互的交叉部彼此有可 能互相干涉而使旋轉變得困難。於是，在1 2級或1 4級的 多級軋製機101中，如圖5所示，會有將萬向接軸的交叉 部的軸方向的位置錯開（成爲所謂的交錯配置），而使萬向 接軸彼此能夠上下或左右不干涉地旋轉的情況。 可是，像圖4(c)所示的本發明的多級軋製機1那樣， 藉由將第2中間輥6作爲驅動輥，第2中間輥（驅動 輥）6、6間的間隔L1(L1>L2、L3)變寬，也不存在左右方 向的萬向接頭的干涉，因而能夠使用擺動直徑大的萬向接 軸，能夠對第2中間輥（驅動輥）6賦予大的驅動轉矩。結 果，對第2中間輥（驅動輥）6賦予大的驅動轉矩，即使是 在12級或14級的多級軋製機101中難以軋製的軋製材 料，例如 1 300~1600mm的寬幅且 4〜5mm厚的不銹鋼鋼 板，也能夠以每1道次25%左右以上的高減縮比進行軋 製》 又，在習知12級軋製機、14級軋製機中，是將4根 第1中間輥1 06作爲驅動輥，但在本發明的多級軋製機1 中，是將2根（上下各1根）第2中間輥6作爲驅動輥。由 此，第2中間輥（驅動輥）6之間的間隔能夠在上下方向變 大。又，在習知12級軋製機、14級軋製機中，是在左右 方向使用上2根、下2根的驅動輥，在本發明的多級軋製 機1中，驅動輥爲上1根、下1根，藉此也能夠在左右方 -14 - 201201919 向確保充分的空間。因此，能夠採用擺動直徑大的萬向接 軸。所以’能夠附加與2 0級軋製機同等或更高的驅動轉 矩。 可是，在本發明的多級軋製機1如上述般，在12級 的多級軋製機101將原先發揮支承輥108作用的中央部的 輥作爲驅動輥，因而圖2的6成爲一體物的輥。因此，必 須在該輥的外側如圖2或圖3所示地設置多個由軸承和鞍 座構成的板寬方向分割式的第1支承輥，使工作輥撓曲最 小化。 又，在圖4(d)所示的20級的多級軋製機1〇1中，在 工作輥1 05的外側附近配置有2根中間輥1 07，配備在該 2根中間輥107的外側的3根輥中的兩端的中間輥1〇6成 爲2根驅動輥。即，在20級的多級軋製機101中，與12 級或1 4級的多級軋製機1 0 1相比，中間輥（驅動輥）1 06間 的間隔在上下方向變成較大的L4(L1 2 L4>L2、L3)，與 12級和14級相比，在左右方向也變大，即使不採用交錯 配置等，也能夠直接將擺動直徑大的萬向接軸連接至中間 輥（驅動輥）1 06，與1 2級和1 4級的多級軋製機1 0 1相 比，能夠對中間輥（驅動輥）1 06賦予大的驅動轉矩。 可是，在20級的多級乳製機101中’配備在中間輥 107的外側的3根輥中的雨端的2根爲中間輥（驅動 輥）1 06，在這些中間輥（驅動輥）1 06的更外側，配置有4 根支承輥108。因此，在由支承輥進行形狀控制的情況 (凸度控制），位於從上部外側的支承輥1 08至工作輕1 05 -15- 201201919 的路徑上之輥間的接觸點（圖4(a)、（b)以及（d)中由黑點表 示的點）的數量，在12級和14級的多級軋製機101爲左 右各2處，相對於此，在20級的多級軋製機101爲左右 各3處。如此，在20級的多級軋製機101中，非常容易 受到輥間的接觸點處的彈性變形的影響，形狀控制性差。 在本發明中，由第1支承輥l〇L、1 0R進行形狀控制（凸度 控制）。因此，如圖4(c)所示，位於從第1支承輥10L、 10R至工作輥5的路徑上之輥間的接觸點爲2處，與20 級的多級軋製機1 〇 1相比，形狀控制性優異。 又，在2 0級的多級軋製機1 0 1，基於各輥相互間的 大小的平衡而使得第1中間輥1 07的直徑比1 2級和1 4級 的多級軋製機1 〇 1、本發明的多級軋製機1的中間輥更 小，其空間變侷促，推力軸承的尺寸等受到限制。所以， 在使中間輥沿軸方向移位之中間輥的形狀控制（橫向調整 裝置）中，20級的多級軋製機101之第1中間輥1〇7的驅 動力受限，因而20級的多級軋製機101的橫向的移動速 度的限制比1 2級、1 4級、本發明的多級軋製機更嚴格， 難以迅速地控制形狀。 如此般，在支承輥所進行的形狀控制（凸度控制）中， 2 0級軋製機的輥間的接觸點多於1 2級、1 4級、本發明的 多級軋製機，形狀控制性差。又，在與工作輥接觸的中間 輥所進行的形狀控制（橫向調整）中，中間輥徑小的2 0級 軋製機1 〇 1的軋製形狀控制能力比1 2級、1 4級、本發明 的多級軋製機差。 -16- 201201919 相對於此，本發明的多級軋製機1，能夠確實地控制 軋製形狀，且以良好的狀態對軋製材料W進行軋製。 [實施例] 接著，以使用1 6級的多級乳製機1的情況作爲實施 例，以使用1 2級和2 0級的多級軋製機1 〇 1的情況作爲比 較例1和比較例2，以使用能夠傳遞至各多級軋製機1的 驅動轉矩的萬向接軸的疲勞強度爲例而進行比較，藉此進 —步詳細地說明本發明的作用效果。 此外，在以下所說明的實施例、比較例1以及比較例 2的多級軋製機均使用相同直徑的（30 mm φ)的工作輥的情 況，以相同的基準比較驅動轉矩》 又，作爲傳遞驅動轉矩的手段雖以萬向接軸爲例，但 也可以使用齒輪式接軸等其他的驅動轉矩傳遞手段。 [比較例1 ] 如圖4(a)所示的比較例1的多級軋製機101，是在 30ιηιηφ的工作輥105的外側附近設有2根中間輥（驅動 輥）1 06的1 2級的多級軋製機。在這種情況，由於中間輥 (驅動輥）1 〇 6間的間隔在上下方向和左右方向非常窄，必 須在極小的空間配備4根萬向接頭。因此，即使接軸爲交 錯配置，萬向接軸也只能使用擺動直徑最大100mm的接 軸。 由於該擺動直徑100mm的接軸的扭轉方向的疲勞轉 -17- 201201919 矩爲160Kgm/根，因而即使4根接軸均等地傳 矩，傳遞至多級軋製機1的驅動轉矩最^ 640Kgra ° [比較例2] 另一方面，如圖4(d)所示的比較例2的多 1 〇 1，是在3 Οηιπιφ的工作輥1 0 5的外側附近透 107而設有2根作爲驅動輥的中間輥106的20 軋製機。在這種情況，作爲驅動輥的中間輥1 在上下方向上和左右方向均較寬，萬向接軸能夠 直徑爲最大125mm的接軸。 由於該擺動直徑125mm的接軸的扭轉方向 矩爲280Kgm/根，如果4根接軸均等地傳遞轉矩 多級軋製機1的驅動轉矩爲11 20Kgm，能夠產生 的接近2倍的驅動轉矩。 [實施例] 相對於上述的比較例1和比較例2，實施例 以下的16級的多級軋製機：如圖4(c)所示，在 和作爲驅動輥的第2中間輥6之間設有2根第 7 ’僅位於2根第1中間輥7的外側附近的3根 央的1根是作爲驅動輥的第2中間輥6»在這種 第2中間輥（驅動輥）6間，在上下方向產生寬的 時，由於左右方向上不存在驅動輥，因而沒有尺 遞驅動轉 ζ也只是 級軋製機 過中間輥 級的多級 間的間隔 使用擺動 的疲勞轉 ，傳遞至 比較例1 1是採用 工作輥5 1中間輥 輥中的中 情況，在 間隔，同 寸限制。 -18- 201201919 所以，能夠使用在比較例1和比較例2中難以採用的 擺動直徑180mm的接軸。 由於該擺動直徑180mm的接軸的扭轉方向的疲勞轉 矩爲1 500Kgm/根，因而雖然接軸的數量只有2根，但傳 遞至多級軋製機1的驅動轉矩爲3000Kgm，能夠傳遞比較 例1的約4.6倍、比較例2的約3倍的驅動轉矩。 此外，像這樣在驅動輥間在上下方向產生寬的間隔， 雖然比較例2的多級軋製機（20級）也是相同的，但在比較 例2中，中間輥（驅動輥）1 06是左右並排地設置，必須在 這些中間輥（驅動輥）106間設置中間輥107或接軸的支撐 構件。因此，在比較例2的多級軋製機，難以充分地確保 在左右方向設置萬向接軸的空間。因此，不能像實施例那 樣安裝擺動直徑大至18 0mm的接軸，能夠傳遞的驅動轉 矩無法像實施例的多級軋製機1那麼大。 又，在比較例1和比較例2中，用於多級軋製機1 〇 1 的接軸均是4根，特別是，由於比較例1的接軸爲交錯配 置，因而接軸有2個種類。因此，在備用品的保有和維護 的方面，比僅使用1個種類的2根接軸的實施例的多級軋 製機1差。 此次揭露的實施方式的所有方面均是例示而不是限 制。本發明的範圍不是藉由上述的說明，而是藉由申請專 利的範圍表示，並包括與申請專利的範圍均等的意義和範 圍內的所有變更。 在上述實施方式，對第2中間輥（驅動輥）6設置2根 -19- 201201919 第2支承輥11，但是，第2支承輥11的數量也可以是1 根。在這種情況下，如圖3所示，以第2支承輥1 1的旋 轉軸心位於工作輥5的旋轉軸心和第2中間輥（驅動輥）6 的旋轉軸心的連接線上的方式配備第2支承輥11即可》 【圖式簡單說明】 第1圖是示意地顯示具備本發明的多級軋製機的軋製 裝置的前視圖。 第2圖是顯示本實施方式的多級軋製機的輥配置的 圖。 第3圖是顯示另一實施方式的多級軋製機的輥配置的 圖。 第4圖是將使用同一工作輥徑的情況的習知多級軋製 機的輥排列例和本發明的第1實施方式的排列例進行對比 的圖，第4(a)圖是12級，第4(b)圖是14級，第4(c)圖是 本發明的第1實施方式的排列例的16級，第4(d)圖是20 級。 第5圖是顯示習知多級軋製機（12級、14級）的驅動 中間輥的驅動系統例的圖。 【主要元件符號說明】 1 :多級軋製機 2 :軋製裝置 3 :捲放部 -20- 201201919 4 :捲繞部 5 :工作輥 6 :第2中間輥（驅動車昆） 7、7R、7L:第1中間輥 8 :支承輥 9 :輥群 10R、10L :第1支承輥 11R、11L:第2支承輥 1 〇 1 :多級軋製機 1 0 5 :工作輥 1 0 6、1 0 7 :中間輥 108 :支承輥 W :軋製材料 -21 -201201919 VI. Description of the Invention [Technical Field] The present invention relates to a multi-stage rolling mill for rolling or the like of a thin plate. [Prior Art] It is known that a multi-stage rolling mill is used when cold rolling a rolled material such as stainless steel or titanium special steel or copper. As the multi-stage rolling mill, a "cluster-type multi-stage rolling mill" in which a roll group supporting a work roll is fan-shaped like a bunch of grapes is generally used. As the roller group supporting the work roll, the support roll and the intermediate roll are included, and depending on the number of rolls for the multistage rolling mill for the cluster type, types of 12 stages, μ stages, 20 stages, and the like are known. The cluster-type multi-stage rolling mill is divided into such a number according to the following reasons. In the cluster type multi-stage rolling mill, the rolling material is usually rolled on the surface and the back surface of the rolled material. A pair of work rolls up and down. Further, the roller groups supporting the work rolls are respectively provided on the upper side and the lower side of the work rolls. In this roller group, for example, only the upper roller group is focused on, and the outer roller is provided to prevent deflection of the inner roller. Therefore, for example, two of the outer side (upper side) of the upper work roller are provided on the outer side (the upper side). The number of the upper side is three, and the number of rollers to be equipped gradually increases as it goes away from the work rolls. Further, in general, the outer roller has a larger roll diameter than the inner roller. As shown in Fig. 4 (a), when the intermediate roll 106 in the vicinity of the upper side of the work roll 105 is used as the drive roll, and three support rolls 108 are provided on the upper side of the intermediate roll, the stage 12 multistage rolling mill is obtained. Further, as shown in Fig. 4 (b), 201201919, when four support rolls 108 are provided on the upper side of the intermediate rolls (drive rolls) 1〇6, the four-stage multi-stage rolling mill is obtained. On the other hand, if two of the two second intermediate rolls provided on the upper side of the two first intermediate rolls provided near the outer side of the work roll are used as the drive rolls, the three second intermediate rolls are used. When four support rolls are provided on the upper side, a 20-stage multi-stage rolling mill as shown in Fig. 4 (d) is obtained. As the above-mentioned 12-stage multi-stage rolling mill, "R&D Kobe Steelmaking Technical Report Vol.58 Νο.2, issued in August 2008 (refer to KT mill (12-stage rolling mill) and KST mill (20-stage rolling mill)) The rolling mill described is known as a 14-stage multi-stage rolling mill, and the rolling mill described in JP-A-2004-1 36328 is known as a 20-stage multi-stage rolling. The KST mill described in the above documents is known. SUMMARY OF THE INVENTION However, recently, the requirements for the accuracy of the rolled shape of a thin plate product produced by a multi-stage rolling mill have become stricter year by year, and there is a tendency to pay attention to the shape control performance of a multi-stage rolling mill. The shape controls the construction and performance of the actuator, for example, as disclosed in pages 14 to 15 of the above-mentioned document. In particular, in the case where the backup roll is used as a shape control actuator, the shape of the rolled material is controlled via the intermediate roll and the work roll. In order to improve the shape controllability, it is preferable to reduce the influence of the flat deformation of the roll caused by the contact between the intermediate rolls. Therefore, since the number of stages of the intermediate rolls interposed therebetween is small, the shape of the rolled material 201201919 is controlled from the backup rolls via the intermediate rolls and the work rolls like the 12-stage rolling mill and the 14-stage rolling mill. When the shape of the rolled material is controlled from the backup roll via the second intermediate roll, the first intermediate roll, and the work roll as in the 20-stage rolling mill, the influence of the flat deformation of the roll is small, and the effect of shape control is large. However, for wide-width rolling of hard materials requiring high rolling torque, based on the relationship between the driving rolls, the 20-stage rolling mill can transmit more than the 12-stage rolling mill and the 14-stage rolling mill. The high torque makes it possible to ensure high productivity. If the 20-stage rolling mill using the work rolls of the same roll diameter is compared with the 12-stage and 14-stage rolling mills, in the 20-stage rolling mill, the second intermediate rolls on both sides become the drive rolls, whereas In the 12-stage and 14-stage rolling mills, the intermediate roll near the outer side of the work roll becomes the drive roll, and the interval between the drive rolls is smaller in the up-and-down direction and the left-right direction than the 20-stage rolling mill (for example, reference) Figure 4) of this specification. As a result, in the 12-stage and 14-stage rolling mills having narrow intervals between the driving rolls, it is difficult to transmit the driving torque equivalent to that of the 20-stage rolling mill due to the limitation of the installation space of the driving system of the driving rolls. In the rolling mills of the class 12 and class 14, in order to increase the transmission drive torque, for example, there is a plate width direction of the intersection of the universal joint shaft that changes the transmission drive torque (the lateral direction of FIG. 5 of the present specification) The position of the larger-sized yoke is used, but even if this method is used, the transmission torque is not as good as that of the 20-stage rolling mill. Therefore, in the case of a hard stainless steel material (hard wide material) having a thickness of, for example, 1300 to 1600 mm and a thickness of 4 to 5 mm, which is thicker than 25% per pass, is required. It is the use of a 20-stage rolling mill at the expense of shape control 201201919. The present invention has been made in view of the above problems, and an object thereof is to provide a multi-stage rolling mill having excellent shape control capability equivalent to that of a 12-stage and 14-stage rolling mill, and having Drive torque equal to or higher than that of a 20-stage rolling mill. In order to achieve the above object, the multistage rolling mill of the present invention employs the following technical means. The multi-stage rolling mill according to the present invention is composed of a pair of upper and lower work rolls for rolling a rolled material, and two upper and lower intermediate rolls are provided in contact with the work rolls. The outer side of the work roll: three rolls of the upper and lower sides are provided outside the first intermediate roll so as to be in contact with the first intermediate roll. Here, the center of the three rolls is the first of the drive rolls. In the intermediate roller, the two rollers at the both ends are the first backup roller that supports the first intermediate roller: and the second acoustic roller that is one or more of the upper and lower rollers, and is disposed in the second intermediate portion so as to support the second intermediate roller. The outside of the roller. The inventors considered that instead of using two rolls provided on the outer side of the work rolls as the drive rolls, one of the three rolls provided on the outer side of the two rolls was driven as a drive roll. Further, it has been recognized that the center roller of the three rolls is driven, and the supporting roller is provided on the driven roller, whereby the present invention can be completed in consideration of productivity and shape control performance. That is, in the conventional 12-stage rolling mill and the 14-stage rolling mill, four first intermediate rolls are used as the driving rolls, but the interval between the driving rolls is made by making the driving rolls into two second intermediate rolls. In the vertical direction, the upper and lower two drive rollers are used as the upper and lower ones in the right direction of the left -8 - 201201919, and a sufficient space can be secured in the left and right directions. A universal joint shaft with a large swing diameter is used. Therefore, it is possible to add a driving torque equal to or greater than that of the 20-stage rolling mill. If the center support roller of the 12-stage rolling mill is driven, the same driving torque as that of the above-described multi-stage rolling mill can be obtained. However, in this case, the center support roller of the 12-stage rolling mill cannot be used for driving. A plate-width-divided roll composed of a plurality of bearings and a saddle, and it is necessary to use a roll of the same body as the intermediate roll of the 12-stage rolling mill. In such a case, since the support roller at the center portion is not supported by the plurality of saddles in the width direction of the casing, the work rolls are greatly deflected, and it becomes difficult to obtain a good plate shape. Since the backup roll is a split roll, and the saddle provided in the split roll is supported in the casing in the width direction of the plate, the work roll deflection of the multi-stage rolling mill is small, and in this regard, for example, disclosed in "R&D Kobe Steel Technology Bulletin Vol.59 No.2, issued in August 2009, 60 pages to 61 pages. Further, the two first support rolls on both sides of the three rolls in the vicinity of the outer side of the first intermediate roll have the same structure as the support rolls of the conventional 12-stage and 14-stage rolling mills, whereby the present invention can be used in the present invention. The multi-stage rolling mill is also provided with a crown adjusting device as a shape control actuator, and thus can maintain good shape controllability of the 12-stage and 14-stage rolling mills. Further, in the above-described multi-stage rolling mill, in order to use the second intermediate roll as the drive roller, the second intermediate roll is a roll which is an integral body. Therefore, it is necessary to provide a plurality of bearings and a saddle on the outer side of the second intermediate roll. The second support roller of the plate width direction division type minimizes deflection of the work roll. -9 - 201201919 It is possible to use a multi-stage rolling mill in which each of the two second backup rolls is provided on the outer side of the second intermediate roll to form 16 stages. Further, it is possible to use a multi-stage rolling mill in which each of the second backup rolls is provided on the outer side of the second intermediate roll to form a four-stage. By using the multi-stage rolling mill of the present invention, even in the above-described hard wide-width material, the shape controllability of the conventional 12-stage and 14-stage rolling mill can be maintained, and it is equivalent to the 20-stage rolling mill. Or higher drive torque, and the hard wide material is rolled at a high reduction ratio. [Embodiment] Hereinafter, the embodiment of the multi-stage rolling mill 1 of the present invention will be described based on the drawings. First, the multi-stage rolling mill 1 of the present invention will be described in detail below by exemplifying a rolling apparatus 2' having a multi-stage rolling mill 1. As shown in Fig. 1, the rolling apparatus 2 has a winding unit 3 that winds the rolled material W to be rolled, and a winding unit 4 that winds the rolled material W to be rolled, and is wound up. A multi-stage rolling mill 1 for rolling the rolled material W is provided between the portion 3 and the winding portion 4. The rolling apparatus 2 is capable of performing forward and reverse switching of the sheet passing direction (inverting the sheet passing direction between the black-out arrow and the blank arrow in Fig. 1) to reverse-roll the rolled material W. As shown in Fig. 2, the multi-stage rolling mill 1 of the present invention is composed of a plurality of work rolls 5, a second intermediate roll (drive roll) 6, a first intermediate roll 7, and a backup roll 8 The combination of the root roller looks like a bunch of grapes, so it is called a cluster-type multi-stage rolling mill. It is suitable for the plate-like shape of steel, titanium, special steel, copper, etc., which is not -10- 201201919. When the rolled material W is subjected to rolling processing. Further, the upper and lower sides of the multi-stage rolling mill 1 will be described with reference to the upper and lower sides of the paper surface of Fig. 2 . Further, the left and right sides of the paper surface of Fig. 2 are described as the left and right when the multistage rolling mill 1 is described. These directions coincide with the direction when the multistage rolling mill 1 is viewed from the drive side. In the following description, the same members are denoted by the same reference numerals. The names and functions of these components are also the same. Therefore, a detailed description about these components will not be repeated. First, each roller constituting the multi-stage rolling mill 1 will be described. In the multi-stage rolling mill 1, a plurality of rolls are provided on the upper side and the lower side of the rolled material W in a mirror image (symmetric) with respect to the rolled material W horizontally transferred in the center in the vertical direction. Hereinafter, these multiple rolls are referred to as a roll group 9). Therefore, in the following description, the roller group 9 on the upper side will be described as a representative example, and each roller constituting the roller group will be described. The upper roller group 9 is composed of one work roll 5' two first intermediate rolls 7, one second intermediate roll (drive roll) 6, and four support rolls 8, and the multi-stage rolling mill 1 of the present embodiment becomes Level 1 constitutes 6 levels. As shown in Fig. 2, the work roll 5 is a roll having a smaller diameter than the other rolls, and in the case of an apparatus for cold rolling a rolled material W of stainless steel, the shape 'is a diameter of about 20 to ΙΟΟιηιηφ. The work rolls 5 are formed by a pair of upper and lower sides, and the rolled material W is sandwiched between the rolls and a rolling load is applied. The first intermediate rolls 7 L and 7R are rollers provided adjacent to the upper left side and the upper right side (outer side) of the work roll 5, and are provided at a distance from each other. The first intermediate rolls 7L, 7R are rolls having a larger diameter than the work rolls 5, and are arranged such that the outer circumferences -11 - 201201919 are in contact with the outer peripheral surfaces of the work rolls 5, respectively. The second intermediate roller (drive roller) 6 is provided on the upper side of the first intermediate rollers 7L and 7R, and the driving force of the second intermediate roller (drive roller) 6 can be transmitted to the operation via the first intermediate rollers 7L and 7R. Roller 5 » The second intermediate roller (drive roller) 6 is provided on the upper right side when viewed from the left intermediate roller 7L so as to be in contact with the left and right first intermediate rollers 7L, 7R, respectively, when viewed from the right intermediate roller 7R It is disposed on the upper left side, and each of the roller groups 9 is provided with one. The second intermediate roller (drive roller) 6 is a roller having a larger diameter than the first intermediate rollers 7L and 7R, and is provided to be rotatable about the axis. The second intermediate roller (drive roller) 6 has a universal joint shaft (not shown) connected to the shaft end portion, and has a structure that can be driven to rotate by a driving force generated by the motor. The support roller 8 that supports the rollers is provided on the outer side of the second intermediate roller (drive roller) 6 and the first intermediate rollers 7L and 7R with reference to the above-described work rolls 5. The backup roller 8 includes first support rollers 10L and 10R that support the first intermediate roller 7, and second support rollers 1 1 L and 1 1 R that support the second intermediate roller (drive roller) 6. The first backup rolls 10L and 10R are provided on the upper left side when viewed from the left intermediate roll 7L, and are disposed on the upper right side when viewed from the right first intermediate roll 7R, and are formed to be larger than the first intermediate roll 7L. 7R larger diameter. The first backup rolls 10L, 10R are provided at a distance from the second intermediate roll (drive roll) 6, and the interval between the first backup roll 10L and the second intermediate roll (drive roll) 6 formed on the left side is set. The interval between the first backup roll 10R and the second intermediate roll (drive roll) 6 formed on the right side is substantially the same. In addition, the first support roller 10L on the left side and the first intermediate roller 7L on the left side are connected to -12-201201919, and the first backup roller 1OR on the right side abuts on the first intermediate roller 7R on the right side, and can be respectively Structure in which the first intermediate rolls 7L and 7R are pressed and supported. The second backup rolls 11L and 11R are provided on the upper left side and the upper right side, respectively, when viewed from the second intermediate roll (drive roll) 6. Each of the second backup rolls 1 1 L, 1 1 R is in contact with the upper side of the second intermediate roll (drive roll) 6, and supports the second intermediate roll (drive roll) 6 so as to be pressed from above. Next, the effect of the multi-stage rolling mill of the present invention will be described by comparison with the conventional multi-stage rolling mill i shown in Figs. 4 to 5 . Further, the effects described below are all effects of the case where the multi-stage rolling mills having the work rolls of the same diameter are compared with each other, and the multi-stage rolling of the 12th, 14th, and 20th stages shown in FIG. Each of the machines has the same work rolls having the same diameter as the multi-stage rolling mill 1 of the present invention. For example, in the 12-stage multi-stage rolling mill 1〇1 shown in Fig. 4(a), two intermediate rolls 106 are disposed near the outer side of the work roll 105, and the outer sides of the two intermediate rolls 106 are Three support rollers 108. Further, in the four-stage multistage dairy machine 101 shown in Fig. 4(b), although four support rollers 108 are used, the common point is that two intermediate light 1 are provided near the outer side of the work roll 185. 06, each of which is driven by the intermediate roller 1 〇6 near the outer side of the work roll 105 as a drive roller. Of course, in the structure in which the intermediate roller 106 in the vicinity of the outer side of the work roll 105 is driven to be lightly driven, the interval between the driving light spaces is easily reduced in the vertical direction and the horizontal direction. For example, if the interval between the driving rollers in the vertical direction is taken as an example, the intervals L2 and L3 thereof are extremely small. Since 13-201201919 is provided at the shaft end portion of the intermediate roller 106 which becomes the driving roller, a universal joint shaft for transmitting the driving force to the intermediate roller 106 is provided, if the universal joint shafts are to be at a narrow interval L2 as described above. When L3 rotates inside, the mutually intersecting portions may interfere with each other to make rotation difficult. Therefore, in the multi-stage rolling mill 101 of the 12-stage or 14-stage, as shown in FIG. 5, the position of the intersection of the universal joint shafts in the axial direction is shifted (so-called staggered arrangement), and The case where the universal joint shafts can be rotated up and down or left and right without interference. However, as in the multi-stage rolling mill 1 of the present invention shown in Fig. 4(c), the second intermediate roller 6 is used as the driving roller, and the interval L1 between the second intermediate rollers (driving rollers) 6 and 6 ( L1 > L2 and L3) are widened, and there is no interference of the universal joint in the left-right direction. Therefore, it is possible to use a universal joint shaft having a large swing diameter, and it is possible to impart a large driving torque to the second intermediate roller (drive roller) 6. . As a result, the second intermediate roller (drive roller) 6 is given a large driving torque, and even a rolled material which is difficult to be rolled in the multistage rolling mill 101 of the 12th or 14th stage, for example, a width of 1 300 to 1600 mm. A stainless steel plate having a width of 4 to 5 mm can also be rolled at a high reduction ratio of about 25% or more per pass. Further, in a conventional 12-stage rolling mill or a 14-stage rolling mill, 4 In the multi-stage rolling mill 1 of the present invention, two (upper and lower) second intermediate rolls 6 are used as the drive rolls. Thereby, the interval between the second intermediate rolls (driving rolls) 6 can be increased in the vertical direction. Further, in the conventional 12-stage rolling mill and the 14-stage rolling mill, two upper and lower driving rollers are used in the left-right direction, and in the multi-stage rolling mill 1 of the present invention, the driving roller is upper. It is possible to ensure a sufficient space in the right and left sides - 14 - 201919. Therefore, a universal joint shaft having a large swing diameter can be used. Therefore, it is possible to add a drive torque equal to or higher than that of the 20-stage rolling mill. However, in the multi-stage rolling mill 1 of the present invention, as in the above-described multistage rolling mill 101 of the 12th stage, the roller which is the center portion which originally functions as the backup roller 108 is used as the driving roller, and thus the 6 of Fig. 2 becomes a unitary body. Roller. Therefore, it is necessary to provide a plurality of first support rollers of a plate width direction division type composed of a bearing and a saddle on the outer side of the roller as shown in Fig. 2 or Fig. 3, so that the work roll deflection is minimized. Further, in the 20-stage multi-stage rolling mill 1〇1 shown in FIG. 4(d), two intermediate rolls 107 are disposed in the vicinity of the outer side of the work roll 105, and are provided in the two intermediate rolls 107. The intermediate rolls 1〇6 at both ends of the outer three rolls are two drive rolls. That is, in the multistage rolling mill 101 of the 20th stage, the interval between the intermediate rolls (driving rolls) 106 becomes larger in the up and down direction than in the multistage rolling mill 101 of the 12th or 14th stage. L4 (L1 2 L4 > L2, L3) is larger in the horizontal direction than in the 12th and 14th stages, and the universal joint shaft having a large swing diameter can be directly connected to the middle without using a staggered arrangement or the like. The roller (drive roller) 106 can impart a large driving torque to the intermediate roller (drive roller) 106 in comparison with the multistage rolling mill 1 0 1 of the 1 2 and 14 stages. However, in the multistage dairy machine 101 of the 20th stage, 'the two of the rain ends of the three rolls provided on the outer side of the intermediate roll 107 are the intermediate rolls (drive rolls) 106, and the intermediate rolls (drive rolls) 1 On the outer side of 06, four support rollers 108 are disposed. Therefore, in the case of shape control by the backup roller (convexity control), the contact point between the rollers on the path from the upper outer support roller 108 to the working light 1 05 -15-201201919 (Fig. 4(a) (b) and (d) the number of points indicated by black dots. The multi-stage rolling mills 101 of the 12th and 14th grades are two on the left and right sides. In contrast, the multistage rolling in the 20th order is performed. The machine 101 is three places on the left and right. As described above, in the multistage rolling mill 101 of the 20th stage, it is highly susceptible to the elastic deformation at the contact point between the rolls, and the shape controllability is poor. In the present invention, shape control (convexity control) is performed by the first backup rolls 10L, 10R. Therefore, as shown in Fig. 4(c), the contact points between the rolls located on the path from the first backup rolls 10L, 10R to the work rolls 5 are two, and the multistage rolling mills 1 20 1 of the 20 stages are It is superior in shape controllability. Further, in the multistage rolling mill 100 of the 20th grade, the multistage rolling mill 1 having the diameter of the first intermediate roll 107 compared to the level of 12 and 14 is based on the balance of the sizes of the rolls. 〇 1. The intermediate roller of the multi-stage rolling mill 1 of the present invention is smaller, the space thereof is changed, and the size of the thrust bearing is limited. Therefore, in the shape control (lateral adjustment device) of the intermediate roller that displaces the intermediate roller in the axial direction, the driving force of the first intermediate roller 1〇7 of the multistage rolling mill 101 of the 20th stage is limited, and thus the 20th stage The lateral moving speed of the multi-stage rolling mill 101 is more restrictive than that of the 12-stage, 14-stage, multi-stage rolling mill of the present invention, and it is difficult to quickly control the shape. In this manner, in the shape control (convexity control) performed by the backup roll, the contact point between the rolls of the 20-stage rolling mill is more than 12 stages, 14 stages, the multi-stage rolling mill of the present invention, and the shape Poor controllability. Further, in the shape control (lateral adjustment) performed by the intermediate roll in contact with the work roll, the rolling shape control ability of the 20-stage rolling mill 1 〇1 having a small intermediate roll diameter is higher than that of the 12-stage, 14-level, The multi-stage rolling mill of the present invention is inferior. In the multi-stage rolling mill 1 of the present invention, the rolling shape can be reliably controlled, and the rolled material W can be rolled in a favorable state. [Examples] Next, a case of using the multistage dairy machine 1 of the 16-stage class was taken as an example, and a case of using the multi-stage rolling mill 1 〇1 of the 12-stage and 20-stage was used as Comparative Example 1 and comparison. In the example 2, the fatigue strength of the universal joint shaft which can be transmitted to the drive torque of each multi-stage rolling mill 1 is used as an example, and the effects of the present invention will be described in detail. Further, in the case of the multi-stage rolling mills of the examples, the comparative examples 1 and the comparative example 2 described below, the work rolls of the same diameter (30 mm φ) were used, and the driving torque was compared with the same reference. As a means for transmitting the driving torque, a universal joint shaft is taken as an example, but another driving torque transmitting means such as a gear type shaft may be used. [Comparative Example 1] In the multi-stage rolling mill 101 of Comparative Example 1 shown in Fig. 4 (a), 12 intermediate rolls (driving rolls) 106 were provided in the vicinity of the outer side of the work roll 105 of 30 ηηηηφ. Grade multi-stage rolling mill. In this case, since the interval between the intermediate rollers (driving rollers) 1 〇 6 is extremely narrow in the up-and-down direction and the left-right direction, it is necessary to provide four universal joints in a very small space. Therefore, even if the shaft is in an interleaved configuration, the universal joint can only use a shaft with a swing diameter of up to 100 mm. Since the fatigue of the torsion direction of the 100 mm-diameter shaft is 1600-201201919, the moment is 160 Kgm/root, so even if the four shafts are equally transferred, the driving torque transmitted to the multi-stage rolling mill 1 is the most 640 Kgra ° [Comparative Example 2] On the other hand, as shown in Fig. 4 (d), the multiple 1 〇 1 of the comparative example 2 was provided with a drive roller of 107 in the vicinity of the outer side of the work roll 1 0 5 of 3 Οηιπιφ. The intermediate roller 106 has 20 rolling mills. In this case, the intermediate roller 1 as the driving roller is wide in both the up and down direction and the left and right direction, and the universal joint shaft can be a shaft having a diameter of at most 125 mm. Since the torsion direction moment of the pivot shaft having a swing diameter of 125 mm is 280 Kgm/root, if the four joint shafts uniformly transmit torque, the driving torque of the multi-stage rolling mill 1 is 11 20 Kgm, and the drive rotation can be nearly doubled. Moment. [Examples] With respect to Comparative Example 1 and Comparative Example 2 described above, the 16-stage multi-stage rolling mill of the following embodiment was as shown in Fig. 4 (c) and the second intermediate roll 6 as a driving roller. There are two 7th central portions which are located only in the vicinity of the outer side of the two first intermediate rolls 7, and the second intermediate roll 6» as the driving roller is in the second intermediate roll (drive roller) 6 When there is a width in the up-and-down direction, since there is no driving roller in the left-right direction, there is no step-and-drive drive, and only the interval between the stages of the intermediate rolling mill through the intermediate rolling stage is transferred to the fatigue transition using the swing. Comparative Example 1 1 is a middle case in which the intermediate roll of the work roll 5 1 is used, and is spaced at the same interval. -18-201201919 Therefore, it is possible to use a shaft having a swing diameter of 180 mm which is difficult to use in Comparative Example 1 and Comparative Example 2. Since the fatigue torque in the torsional direction of the shaft having the swing diameter of 180 mm is 1,500 Kgm/root, the number of the shafts is only two, but the driving torque transmitted to the multi-stage rolling mill 1 is 3000 Kgm, and the comparative example can be transmitted. About 4.6 times of 1 and about 3 times of driving torque of Comparative Example 2. Further, as described above, a wide interval was generated between the driving rollers in the vertical direction, and although the multi-stage rolling mill (20-stage) of Comparative Example 2 was also the same, in Comparative Example 2, the intermediate roller (driving roller) 106 was Arranged side by side, it is necessary to provide an intermediate roller 107 or a support member for the shaft between the intermediate rollers (drive rollers) 106. Therefore, in the multi-stage rolling mill of Comparative Example 2, it is difficult to sufficiently ensure a space in which the universal joint shaft is provided in the left-right direction. Therefore, the shaft having the swing diameter of up to 180 mm cannot be mounted as in the embodiment, and the drive torque that can be transmitted cannot be as large as that of the multi-stage rolling mill 1 of the embodiment. Further, in Comparative Example 1 and Comparative Example 2, the number of the joints for the multi-stage rolling mill 1 〇1 was four, and in particular, since the joint shaft of Comparative Example 1 was arranged in a staggered manner, there were two joint shafts. kind. Therefore, in terms of the maintenance and maintenance of the spare parts, it is inferior to the multi-stage rolling mill 1 of the embodiment in which only one type of two shafts are used. All aspects of the disclosed embodiments are illustrative and not restrictive. The scope of the present invention is defined by the scope of the claims, and the scope of the claims and the scope of the claims. In the above embodiment, the second intermediate roller (drive roller) 6 is provided with two second support rollers 11 of -19-201201919. However, the number of the second backup rollers 11 may be one. In this case, as shown in FIG. 3, the rotation axis of the second backup roll 1 1 is located on the connection line between the rotation axis of the work roll 5 and the rotation axis of the second intermediate roll (drive roller) 6. The second backup roll 11 may be provided. [Brief Description of the Drawings] Fig. 1 is a front view schematically showing a rolling apparatus including the multi-stage rolling mill of the present invention. Fig. 2 is a view showing a roller arrangement of the multi-stage rolling mill of the present embodiment. Fig. 3 is a view showing a roller arrangement of a multi-stage rolling mill of another embodiment. Fig. 4 is a view comparing a roller array example of a conventional multi-stage rolling mill using the same work roll diameter and an arrangement example of the first embodiment of the present invention, and Fig. 4(a) is a 12th stage, 4(b) is a 14th level, 4(c) is a 16th stage of the arrangement example of the first embodiment of the present invention, and 4th (d) is a 20th stage. Fig. 5 is a view showing an example of a drive system for driving a middle roller of a conventional multi-stage rolling mill (12th grade, 14th grade). [Description of main component symbols] 1 : Multi-stage rolling mill 2 : Rolling device 3 : Reeling section -20- 201201919 4 : Winding section 5 : Work roll 6 : 2nd intermediate roll (drive car Kun) 7, 7R 7L: first intermediate roll 8: backup roll 9: roll group 10R, 10L: first support roll 11R, 11L: second support roll 1 〇1: multi-stage rolling mill 1 0 5 : work roll 1 0 6 1 0 7 : intermediate roll 108 : backup roll W : rolled material - 21 -