201236776 六、發明說明： 【發明所屬之技術領域】 本發明是關於熱軋鋼板的製造方法以及熱軋鋼板的製 造裝置，詳細來說是關於’即使在對被熱軋精加工機所軋 製之後的高溫的被軋製材，噴射冷卻水而將被軋製材進行 水冷，藉此來製造熱軋鋼板時，也能進行適當的被軋製材 的溫度管理。 【先前技術】 使用爲汽車用或構造材等的鋼材，必須在強度、加工 性、韌性這樣的機械特性上很優異，爲了綜合提高這些機 械特性，將鋼材組織細微化的方式很有效。因此，摸索出 很多用來獲得具有細微組織的鋼材的方法。藉由組織的細 微化，則可獲得：即使減少合金元素的添加量也能具備優 異的機械性質的高強度熱軋鋼板。 已知作爲組織的細微化方法，是在熱軋精加工機列的 尤其後段，進行高下壓率的軋製，將沃斯田鐵粒細微化， 並且使軋製應變累積於被軋製材，而達成：軋製後所得到 的肥粒鐵的細微化。並且，從抑制沃斯田鐵的再結晶或回 復而促進肥粒鐵變態的觀點來看，在軋製後儘可能在短時 間內將被軋製材冷卻至600 °C〜75 0 °C的方式很有效。也 就是說，接著熱軋加工，設置可較習知方式更快冷卻的冷 卻裝置，將軋製後的被軋製材急速冷卻的方式很有效。爲 了以該方式將軋製後的被軋製材急速冷卻，爲了將冷卻能 -5- 201236776 力提高，將對被軋製材噴射的每單位面積的冷卻水s，也 就是將流量密度提高的方式很有效。這種冷卻方法在以下 稱爲立刻急速冷卻。 在熱軋鋼板的製造，爲了最後能獲得所希望的性質， 儘可能正確進行被軋製材的溫度管理很重要。因此，在熱 軋鋼板的製造裝置的各處，設置有：用來掌握在該時間點 的被軋製材的溫度的溫度測定手段。從這樣的觀點來看， 在熱軋精加工機列的出口側也設置有溫度測定手段，則能 取得：軋製加工完成的時間點的被軋製材的溫度。軋製加 工機的出口側的溫度’由於之後的步驟有冷卻步驟，所以 決定最終目標的溫度、以及決定用來得到該溫度的冷卻的 程度很重要。 可是’當如上述在軋製加工之後用水進行急速冷卻時 ’在軋製加工機出口側無法測定被軋製材溫度。對於這個 問題’在專利文獻1揭示有用來獲得軋製機出口側的溫度 的手段。藉此’以往利用熱軋精加工機列的最終台座出口 側設置的溫度計所進行的軋製機出口側溫度的測定，因爲 冷卻水而變得無法測定’所以記載著在熱軋精加工機列的 最終台座入口側，來測定被軋製材的溫度的技術。 [先前技術文獻] [專利文獻] 專利文獻1 :日本特開昭6 1 — 5 6722號公報 -6- ⑤‘ 201236776 【發明內容】 [發明欲解決的課題] 錯由專利文獻1的記載，雖然有記載與最終台座出口 側溫度相當的最終台座入口側溫度，可是並沒有揭示實際 是如何計算出該溫度，而無法利用最終台座入口側溫度來 進行溫度控制。 因此本發明’鑑於上述問題，其課題是要提供一種熱 軋鋼板的製造方法以及熱軋鋼板的製造裝置，在熱軋鋼板 的製造線’即使在配置有可從熱軋精加工機列內進行冷卻 的冷卻裝置的情況，針對熱軋精加工機列的最終台座間的 被軋製材溫度，也能賦予目標溫度。 [用以解決課題的手段] 以下針對本發明來說明。雖然爲了容易了解，以括弧 記載圖面所附的符號，本發明並不限定於此。 申請專利範圍第i項記載的發明，是用來製造熱軋鋼 板的方法’對於在熱軋精加工機列（1 1 )的最終台座的下 游步驟側的該最終台座的內側，噴射冷卻水將被軋製材急 速冷卻’並且在最終台座的入口側，測定被軋製材的表面 溫度’取得入口側測定表面溫度，從最終台座的出口側的 被軋製材的目標表面溫度也就是出口側目標表面溫度，根 據：最終台座的軋製導致的加工發熱導致的溫度上升、最 終台座的工作輥與被軋製材的接觸導致的溫度降低、以及 從入口側測定表面溫度的測定位置到最終台座的工作輥爲 201236776 止的搬運的氣冷導致的溫度降低；來計算出入口側測定表 面溫度測定位置的被軋製材的目標表面溫度也就是入口側 目標表面溫度。 申請專利範圍第2項記載的發明’在申請專利範圍第 1項記載的熱軋鋼板的製造方法之中，當計算出入口側目 標表面溫度時，也包含軋製方向的被軋製材的表面溫度變 化的要素。 申請專利範圍第3項記載的發明，在申請專利範圍第 1或2項記載的熱軋鋼板的製造方法之中，當熱軋精加工 機列（1 1 )所進行的軋製，是在該軋製途中使軋製機的下 壓率變化的軋製方法時，當計算出入口側目標表面溫度時 ，其要素也包含：下壓率的變化導致的板厚度的變化、以 及被軋製材與工作輥的摩擦係數的變化。 申請專利範圍第4項記載的發明，在申請專利範圍第 1〜3項其中任一項記載的熱軋鋼板的製造方法之中，被 軋製材，在最終台座入口側也藉由冷卻水加以冷卻，當計 算出入口側目標表面溫度時，其要素也包含：當從入口側 測定表面溫度的測定位置到最終台座的工作輥爲止的搬運 時的水冷導致的溫度降低。 申請專利範圍第5項記載的發明，在申請專利範圍第 1〜4項其中任一項記載的熱軋鋼板的製造方法之中，入 口側測定表面溫度的測定手段，是配置在與被軋製材的表 面相對向的位置的溫度計，溫度計，是在被軋製材板寬度 方向配置有複數個，或是--個寬度方向溫度計。 201236776 申請專利範圍第6項記載的發明，在申請專利範圍第 1〜5項其中任一項記載的熱軋鋼板的製造方法之中，入 口側測定表面溫度的測定手段，是水柱溫度計，該水柱溫 度計，具備有：配置在與被軋製材的表面相對向的位置的 放射溫度計、以及用來在被軋製材與放射溫度計之間形成 作爲光導波路的水流的水柱形成手段。 申請專利範圍第7項記載的發明，在申請專利範圍第 1〜6項其中任一項記載的熱軋鋼板的製造方法之中，根 據運算出的入口側目標表面溫度、以及測定出的入口側測 定表面溫度，將入口側目標表面溫度與入口側測定表面溫 度進行對比，以讓入口側測定表面溫度成爲入口側目標表 面溫度的方式，將指令發送到：線圈盒、粗棒加熱器、除 鱗機、以及台座間冷卻裝置的至少其中一個。 申請專利範圍第8項記載的發明，在申請專利範圍第 1〜7項其中任一項記載的熱軋鋼板的製造方法之中，當 未進行急速冷卻而進行軋製時，在可進行該急速冷卻的區 間或之後’測定被軋製材的表面溫度，來取得該軋製後的 表面溫度。 申請專利範圍第9項記載的發明，在申請專利範圍第 8項其中任一項記載的熱軋鋼板的製造方法之中，根據入 口側測定表面溫度、及軋製後表面溫度，計算出最終台座 出口側的被軋製材的表面溫度，將該計算出的表面溫度、 與在入口側目標表面溫度的運算過程所得到的最終台座出 口側的被軋製材的表面溫度，進行對比，根據其誤差，將 -9- 201236776 入口側目標表面溫度的運算予以變更。 申請專利範圍第1 〇項記載的發明，是製造熱軋鋼板 的方法，對於在熱軋精加工機列（1 1 )的最終台座的下游 步驟側的該最終台座的內側，噴射冷卻水將被軋製材急速 冷卻，並且在最終台座的入口側，測定被軋製材的表面溫 度，取得入口側測定表面溫度，將預先給予的入口側目標 表面溫度與入口側測定表面溫度進行對比，以讓入口側測 定表面溫度成爲入口側目標表面溫度的方式，將指令發送 到：線圈盒、粗棒加熱器、除鱗機、以及台座間冷卻裝骰 的至少其中一個。 申請專利範圍第1 1項記載的發明，是具備有熱軋精 加工機列（11)的熱軋鋼板的製造裝置10，是具備有： 配置在熱軋精加工機列的最終台座的下游步驟側，其至少 局部配置於該最終台座的內側，而可噴射冷卻水的立刻急 速冷卻裝置（2 0 )、在最終台座的入口側設置成可測定被 軋製材的表面溫度的被軋製材溫度測定手段（4 0 )、以及 從最終台座的出口側的被軋製材的目標表面溫度也就是出 口側目標表面溫度，根據··最終台座的軋製導致的加工發 熱導致的溫度上升、最終台座的工作輥與被軋製材的接觸 導致的溫度降低、以及從入口側測定表面溫度的測定位歷 到最終台座的工作輥爲止的搬運的氣冷導致的溫度降低； 來計算出入口側測定表面溫度測定位置的被軋製材的目標 表面溫度也就是入口側目標表面溫度的目標溫度運算裝置 (51)。 ⑤ 201236776 申請專利範圍第1 2項記載的發明，在申請專利範圍 第Μ項其中任一項記載的熱軋鋼板的製造裝置（10)之 中，目標溫度運算裝置（5 1 )，當計算出入口側目標表面 溫度時，可進行也包含軋製方向的被軋製材的表面溫度變 化的要素之運算。 申請專利範圍第1 3項記載的發明，在申請專利範圍 第11或12項記載的熱軋鋼板的製造裝置（1〇)之中，熱 軋精加工機列（1 1 )，在軋製途中可使下壓率變化，當在 該軋製途中使軋製機的下壓率變化的軋製方法時，目標溫 度運算裝置（51)，當計算出入口側目標表面溫度時，可 進行也包含：下壓率的變化導致的板厚度的變化、以及被 軋製材與工作輥的摩擦係數的變化的要素之運算。 申請專利範圍第1 4項記載的發明，在申請專利範圍 第11〜13項其中任一項記載的熱軋鋼板的製造裝置（10 )之中，在最終台座（1 1 g )入口側也設置有：可將冷卻 水對被軋製材噴射的冷卻裝置（35)，目標溫度運算裝置 (51)，當計算出入口側目標表面溫度時，可運算：因爲 在最終台座入口側設置的冷卻裝置導致被軋製材的溫度降 低。 申請專利範圍第1 5項記載的發明，在申請專利範圍 第1 1〜1 4項其中任一項記載的熱軋鋼板的製造裝置（1〇 )之中，被軋製材溫度測定手段（40 )，是配置在與被軋 製材的表面相對向的位置的溫度計，該溫度計，是在被軋 製材板寬度方向配置有複數個，或是一個寬度方向溫度計 -11 - 201236776 申請專利範圍第1 6項記載的發明，在申請專利範園 第1 1〜1 5項其中任一項記載的熱軋鋼板的製造裝置（1〇 )之中，被軋製材溫度測定手段（4 0 )，是水柱溫度計， 該水柱溫度計，具備有：配置在與被軋製材的表面相對向 的位置的放射溫度計、以及用來在被軋製材與放射溫度計 之間形成作爲光導波路的水流的水柱形成手段。 申請專利範圍第1 7項記載的發明，在申請專利範閱 第1 1〜1 6項其中任一項記載的熱軋鋼板的製造裝置（10 )之中，進一步具備有：線圈盒（1 5 )、粗棒加熱器（1 6 )、除鱗機（1 7 )、以及台座間冷卻裝置（3 5 )的至少其 中一個，目標溫度運算裝置（5 1 )，可控制：所具備的線 圈盒、粗棒加熱器、除鱗機、以及台座間冷卻裝置的至少 其中一個。 申請專利範園第1 8項記載的發明，在申請專利範圍 第1 1〜1 7項其中任一項記載的熱軋鋼板的製造裝置（1 1 〇 )之中，在立刻急速冷卻裝置（20)內，或在立刻急速冷 卻裝置的出口側，配置有：用來測定被軋製材的溫度的手 段。 申請專利範園第1 9項記載的發明，在申請專利範圍 第1 8項其中任一項記載的熱軋鋼板的製造裝置（1〗〇 )之 中，目標溫度運算裝置（5 1 )，根據：被軋製材溫度測定 手段（40 )、以及在立刻急速冷卻裝置（20 )內或立刻急 速冷卻裝置的出口側配置的用來測定被軋製材的溫度的手 -12- ⑤. 201236776 段（1 40 )，所進行溫度測定的結果，計算出最終台座（ 1 1 g )出口側的被軋製材的表面溫度，將該計算出的表面 溫度、與在入口側目標表面溫度的運算過程所得到的最終 台座出口側的被軋製材的表面溫度，進行對比，根據其誤 差，可將入口側目標表面溫度的運算予以變更。 [發明效果] 藉由本發明的熱軋鋼板的製造方法、及熱軋鋼板的製 造裝置，即使在熱軋精加工機列的出口側配置有可從熱軋 精加工機列內進行冷卻的冷卻裝置的情況，針對熱軋精加 工機列的最終台座間的被軋製材溫度，也能賦予目標溫度 。藉由具備有針對所給予的目標溫度進行控制的手段，而 也可進行被軋製材的溫度管理。 【實施方式】 本發明上述的作用及優點，從下面所說明的用來實施 發明的型態即可了解。以下根據圖面所示的實施方式來說 明本發明。可是本發明並不被該實施方式所限定。 第1圖是用來說明第一實施方式的熱軋鋼板的製造裝 置10(以下有的是記載爲「製造裝置10」）的槪念圖。 在桌1圖，被軋製材1 是從紙面左邊（上游側，上游步 驟側）朝右邊（下游側’下游步驟側）的方向搬運，紙面 上下爲錯直方向。這裡以虛線顯示通過線。上游側（上游 步驟側）/下游側（下游步驟側）方向記載爲穿過方向， -13- 201236776 與其正交的方向，將所穿過的被軋製材的板 爲被軋製材板寬度方向。在圖中爲了容易觀看 號記載則省略。 如第1圖所示，製造裝置10，具備有： 粗棒加熱器1 6、除鱗機1 7、熱軋精加工機列 1 2、1 2…、夾送輥1 3、及立刻急速冷卻裝置 造裝置1 0，在熱軋精加工機列1 1的各台座之 座間冷卻裝置3 5，在最終台座1 1 g的入口側 製材溫度測定手段40»除此之外在製造裝置 溫度控制手段5 0。 雖然省略圖示及說明，而在較線圈盒1 5 側，配置有加熱爐或粗軋製機列等，另一方面 輥1 3更下游步驟側，配置有：熱循環冷卻裝 〇 熱軋鋼板是大致以下述方式製造。也就是 熱爐抽出，以粗軋製機列軋製至預定厚度的粗 行溫度控制，一邊連續將其以熱軋精加工機列 預定的厚度。然後，在立刻急速冷卻裝置20 。然後，通過夾送輥13，藉由熱循環冷卻裝 至預定的捲繞溫度，藉由捲繞機將其捲繞成線 針對詳細的製造方法加以說明。 以下針對製造裝置1 0詳細說明。第2圖 圖之中熱軋精加工機列1 1的台座1 1 f、最終古 刻急速冷卻裝置2 0、及夾送輥1 3爲止的部位 度方向記載 ，重複的岡 線圈盒1 5、 1 1、搬運輥 2 0。並且製 間具備有台 配置有被軋 1 〇，具備有 更上游步驟 ，在較夾送 置或捲繞機 說，將從加 棒，一邊進 1 1軋製至 內急速冷卻 置將其冷卻 圈狀。後面 ，是將第1 座1 1 g、立 放大顯示的 -14- ⑤ 201236776 圖面。第3圖是進一步關注於最終台座1 1 g的出口側的圖 面。 熱軋精加工機列1 1，是沿著穿過方向並排有7台的 軋製機11a.....Ilf、llg。各個軋製機11a.....llf、 llg，是以構成所謂各台座的軋製機，將下壓率等的軋製 條件設定成：能符合最終製品所需要的厚度、機械性質、 表面品質等的條件。這裡各台座的下壓率，雖然設定成： 符合所製造的被軋製材應具有的性能，而從達到··進行高 下壓軋製，將沃斯田鐵粒細微化，並且使軋製應變累積於 被軋製材，將軋製後所得到的肥粒鐵粒細微化的觀點來看 ，在最終台座也就是台座llg，儘可能地讓下壓率較大較 佳。 各台座的軋製機，具有：實際將被軋製材夾住且下壓 的一對工作輕 llaw、llaw、…、llfw、llfw、llgw、 1 l g W ;以及配置成讓外周彼此相接於該工作輥的一對支 撐輥 1 1 ab、1 1 ab.....1 1 fb、1 1 fb、1 1 gb、1 1 gb。各台座 的軋製機，具備有：將上述工作輥及支撐輥包含於內側， 形成軋製機的外殼，用來支承軋製輥的殻體1 1 ah..... 1 1 fh、1 1 gh。該殼體，具有相對向豎立設置的成對的立設 部llgr、llgr，該立設部llgr、llgr成對之間，是豎立 設置成：在被軋製材板寬度方向將所穿過的被軋製材1夾 著。 這裡在第2圖以L 1所示的最終台座1 1 g的工作輥 1 1 gw的軸中心與殼體立設部1 1 gr的下游步驟側端面的距 -15- 201236776 離，是大於工作輥llgw的半徑rl。於是，在相當於Ll-rl的部位，能如後述配置立刻急速冷卻裝置20的一部分 。也就是說可將該立刻急速冷卻裝置20的一部分設置成 插入於殻體1 lgh的內側。 搬運輥1 2、12、…，是將被軋製材1朝穿過方向搬 運的軋輥組。 夾送輥13，是兼作爲除水功用，設置在立刻急速冷 卻裝置2 0的下游步驟側。藉此，則能防止：在立刻急速 冷卻裝置20內所噴射的冷卻水朝被軋製材1的下游步驟 側流出。並且，防止立刻急速冷卻裝置20上的被軋製材 1的波動性，尤其在將被軋製材1的前端咬入於捲繞裝置 之前的時間點能使被軋製材1的穿過性提升。這裡夾送輥 1 3的軋輥之中的上側的軋輥1 3 a，如第2圖所示可上下移 動。 立刻急速冷卻裝置20，具備有：上面供水手段2 1、 21.....下面供水手段22、22.....上面導件25、25、 …、以及下面導件30、30、…。 上面供水手段2 1、2 1、…，是用來對被軋製材1的 上面側供給冷卻水的手段，具備有：冷卻集管2 1 a、2 1 a 、…；複數列設置於各冷卻集管21a、21a、…的導管21b 、2 1 b、…；以及安裝在該導管2 1 b、2 1 b、…的前端的冷 卻噴嘴 21c、21c、···。 冷卻集管21a是朝被軋製材板寬度方向延伸的配管， 將該冷卻集管21a' 21a、…並排於穿過方向。 -16- 201236776 導管2 1 b、2 1 b、…，是從各冷卻集管2 1 a分歧的複 數的較細的配管’其開口端部是朝向被軋製材1的上面側 (通過線的上面側）。導管2 1 b、2 1 b、…，是沿著冷卻 集管21a的管長方向，也就是朝被軋製材板寬度方向設置 成複數且爲梳齒狀。 在各導管21b、21b、…的前端安裝有冷卻噴嘴21c、 21c、…。本實施方式的冷卻噴嘴21c、21c、，是可形成 扇形的冷卻水噴流（例如5mm〜3 0mm左右的厚度）的扁 平型的噴霧噴嘴。在第4圖、第5圖，針對藉由該冷卻噴 嘴2 1 c、2 1 c、…形成於被軋製材表面的冷卻水噴流而顯 示模式圖。第4圖是立體圖。第5圖是槪略地顯示該噴流 衝撞到被軋製材表面時的衝撞型態的圖面。在第5圖，白 圈顯示的是冷卻噴嘴2 lc、2 1 c、…的正下方的位置，粗 線顯示的是冷卻水噴流的衝撞位置、形狀。在第4圖、第 5圖是將穿過方向與被軋製材板寬度方向一起顯示。 如第4圖、第5圖所示的本實施方式，在相鄰的噴嘴 列，是配置成將被軋製材板寬度方向的位置錯開，並且讓 其相鄰的噴嘴列與被軋製材板寬度方向位置相同，爲所謂 的交錯狀排列。 在本實施方式，涵蓋被軋製材表面的被軋製材板寬度 方向的全部位置，以將屬於相同噴嘴列的冷卻水噴流至少 能通過兩次的方式，配置有冷卻噴嘴2 1 c、2 1 c、…。也 就是說，有穿過的被軋製材的點ST，沿著第5圖的直線 箭頭移動。此時，在噴嘴列A兩次（A1、A2 )、噴嘴列 -17- 201236776 B兩次（B1、B2)、噴嘴列C兩次（Cl、C2)…，在各 噴嘴列讓來自屬於該噴嘴列的噴嘴的噴流衝撞兩次。因此 ，將冷卻噴嘴 2 1 c、2 1 c、…配置成：在冷卻噴嘴2 1 c、 2 1 c、…的間隔Pw、冷卻水噴流的衝撞寬度L、扭轉角度 /3之間，成立： L = 2Pw/cos β 的關係。這裡雖然是通過兩次，而並不限定於此，也可作 成通過三次以上。從要達到被軋製材板寬度方向的冷卻能 力均勻化的觀點來看，在穿過方向相鄰的噴嘴列，是將冷 卻噴嘴2 1 c、2 1 c、…朝互相相反的方向扭轉。 藉由噴嘴的排列決定了關於被軋製材的冷卻的「均勻 冷卻寬度」。這代表著，所配置的噴嘴組的性質上，可讓 所搬運的被軋製材均勻冷卻的被軋製材寬度方向的大小。 具體來說，通常是與在被軋製材的製造裝置所能製造的最 大被軋製材的寬度一致。具體來說是例如第5圖的RH所 示的大小。 在本實施方式，在如上述相鄰的噴嘴列，說明了將冷 卻噴嘴2 1 c、2 1 c、…朝互相相反的方向扭轉的型態，而 並不一定限定於此’也可以是全部朝相同方向扭轉的型態 。扭轉角（上述0 )也不一定要特別限定，可以從所需要 的冷卻能力或設備配置的收納等的觀點來作適當決定。 在本實施方式，雖然從上述優點的觀點來看，將在穿 -18- ⑤. 201236776 過方向鄰接的噴嘴列作成交錯狀排列的型態’而 於此，也可是將冷卻噴嘴在穿過方向並排於直線 〇 具備有上面供水手段2 1的位置’尤其是應 卻噴嘴2 1 c、2 1 c、…的位置，雖然沒有特別限 好配置成：在熱軋精加工機列11的最終台座11 從該最終台座llg的殼體llgh的內側盡量接近 座1 1 a的工作輥1 1 g W。藉由以該方式配置’則 精加工機列1 1所進行的軋製之後的被軋製材1 ，並且能穩定被軋製材1的前端部而將其導引到 20。在本實施方式，如第2圖所示，接近工作輥 冷卻噴嘴2 1 c、2 1 c、…是配置接近於被軋製材1 並且，從各冷卻噴嘴 2 1 c、2 1 c、…的冷卻 所噴射的冷卻水的噴射方向基本上爲鉛直方向’ ，從與最終台座1 1 g的工作輥1 1 gw、1 1 gw最接 噴嘴2 1 c、2 1 c、…22c、22c、…所進行的冷卻水 最好是較鉛直方向更傾向工作輥1 1 g w、1 1 g w的 此，則可使從以最終台座1 1 g壓下被軋製材1起 始爲止的時間進一步縮短，則可使因爲軋製所累 應變回復的時間大致成爲0。於是，能製造出具 組織的被軋製材。 下面供水手段22、22.....是對被軋製材 側供給冷卻水的手段，具備有：冷卻集管22a ' :複數列設置於各冷卻集管22a、22a、…的導 並不限定 上的型態 配置有冷 定，而最 g之後， 該最終台 能將熱軋 急速冷卻 冷卻裝置 1 1 g w 的 〇 水噴射口 另一方面 近的冷卻 的噴射， 方向。藉 到冷卻開 積的軋製 有更細微 1的下面 2 2a ' .·· 管 22b、 -19- 201236776 22b、…；以及安裝在該導管22b、22b、…的前端的冷卻 噴嘴22c、22c、…。下面供水手段22、22.....設窿成 與上述的上面供水手段2 1、2 1、…相對向，雖然冷卻水 的噴射方向不同，可是大致與上面供水手段2 1、2 1、… 相同，所以這裡省略說明。 接著針對上面導件25、25、…加以說明。上面導件 2 5、2 5、…爲板狀的構件，配置在：上面供水手段21與 所搬運的被軋製材1之間，設置成：當通過被軋製材1的 前端時，讓該被軋製材〗的前端不會卡到導管2 1 b、2 1 b 、…或冷卻噴嘴2〗c、21c。另一方面，在上面導件25、 2 5、…設置有：使來自上面供水手段21的噴流通過的流 入孔。藉此，讓來自上面供水手段21的噴流通過該上面 導件2 5、2 5、…而到達被軋製材1的上面，而可進行適 當的冷卻。這裡所使用的上面導件2 5的形狀，並沒有特 別限定，可使用習知的上面導件。 上面導件25、25.....配置成如第2圖所示。在本 實施方式，使用三個上面導件25、25、25，將其並排於 穿過方向。任一個上面導件25、25、25都配置成對應於 冷卻噴嘴2 1 c、2 1 c、…的高度方向位置。也就是說，在 本實施方式，在與最終台座llg的工作輥llgw最接近的 上面導件2 5，配置成傾斜成：讓最終台座丨丨g側端部較 低，另一端側較高。另外兩個上面導件25、25，配置成 :與穿過面具有預定的間隔而與該穿過面大致平行。 下面導件3 0，是配置在下面供水手段2 2與所搬運的 -20- 201236776 被軋製材1之間的板狀的構件。藉此，則可防止··尤其當 將被軋製材1通過該製造裝置10時，被軋製材1的最前 端卡到下面供水手段22、22、…或搬運輥1 2、1 2、··.的 情形。另一方面，在下面導件30設置有：使來自下面供 水手段2 2的噴流通過的流入孔。藉此，讓來自下面供水 手段22的噴流通過該下面導件30而到達被軋製材1的下 面，而可進行適當的冷卻。下面導件3 0的形狀並沒有特 別限定，可使用習知的下面導件。 該下面導件30，是配置成如第2圖所示。在本實施 方式，使用四個下面導件30、30、…，配置在各搬運輥 1 2、1 2、1 2之間。任一個下面導件3 0、3 0、…都配置在 :相對於搬運輥1 2、1 2、…的上端部不會低太多的高度 〇 在本實施方式雖然說明具備有下面導件3 0的例子， 而也可不一定要設置下面導件。 在如以上的冷卻水的供給，針對具體的供給水量，是 根據所需要的被軋製材的冷卻熱量而適當決定，並沒有特 別限定。可是，如上述，從被軋製材組織的細微化的觀點 來看，軋製之後的急速冷卻是有效的，因此供給水量密度 較高的冷卻水較佳。從上述被軋製材組織的細微化的觀點 來看，所供給的每片面的冷卻水的水量密度’例如1 〇〜 2 5m3/ ( m2 ·分鐘）。更大的水量密度也可以。作爲冷卻 能力，在3mm厚的被軋製材，爲600 °C /秒以上較佳》 回到第1圖〜第3圖，繼續針對製造裝置1 〇來說明 -21 - 201236776 。台座間冷卻裝置3 5，是分別配置在熱軋精加工機列11 的各台座之間的冷卻手段，具有：台座間上面供水手段 36、台座間下面供水手段37、及台座間下面導件38。這 裡針對在台座1 1 f、與最終台座1 1 g之間配置的台座間冷 卻裝置3 5加以說明。配置在其他台座間的台座間冷卻裝 置也是相同的構造。 台座間上面供水手段3 6，是在該台座間對被軋製材1 的上面側供給冷卻水的手段，具備有：冷卻集管36a :複 數列設置於冷卻集管36a的導管36b ' 36b、…；以及安 裝在該導管36b、36b…的前端的冷卻噴嘴36c、36c、… 〇 冷卻集管36a是朝被軋製材板寬度方向延伸的配管， 導管36b、3 6b.....是從冷卻集管36a分歧的複數的較 細的配管所形成，其開口端部是朝向被軋製材的上面側。 導管36b、36b、…，是沿著冷卻集管36a的管長方向， 也就是朝被軋製材板寬度方向設置成複數且爲梳齒狀。 在各導管36b、36b、…的前端安裝有冷卻噴嘴36c、 36c、…。本實施方式的冷卻噴嘴36c、36c、，是可形成 扇形的冷卻水噴流（例如5mm〜30mm左右的厚度）的扁 平型的噴霧噴嘴。 台座間下面供水手段3 7，是對被軋製材1的下面側 供給冷卻水的手段，具備有：冷卻集管37a ;複數列設置 於冷卻集管37a的導管37b、37b、…；以及安裝在該導 管3 7 b、3 7 b…的前端的冷卻噴嘴3 7 c、3 7 c、…。台座間 -22- ⑤ 201236776 下面供水手段3 7，設置成與上述的台座間上面供水手段 3 6相對向，雖然冷卻水的噴射方向不同，可是大致與台 座間上面供水手段3 6相同，所以這裡省略說明。 台座間下面導件3 8，是配置在搬運被軋製材1的通 過線的下方的板狀的構件，將上游步驟側導件3 8a與下游 步驟側導件3 8b配置成在搬運方向具有預定的間隙。在該 間隙’配置有：沒有圖示的彎針（looper )、與上述台座 間下面供水手段3 7。藉此，不會妨礙彎針或台座間下面 供水手段的功能，能適當地導引被軋製材1。 這裡在台座間下面供水手段3 7的下游步驟側導件 3 8b ’與配置有後述的被軋製材溫度測定手段4〇的位置對 應，設置有測定用的孔部。 被軋製材溫度測定手段4 0，是在熱軋精加工機列11 的最終台座1 1 g的入口側’配置於被軋製材i的下面側， 用來測定該被軋製材1的表面溫度（入口側測定表面溫度 )。被軋製材溫度測定手段40，只要是能測定入口側測 定表面溫度即可，任何種類的感應器都可以，並不限於特 定的型式。 可是’在本實施方式’考慮到藉由上述的台座間冷卻 裝置3 5而在被軋製材1的表面滯留有冷卻水的情形，而 最好是將這裡因爲噴射的冷卻水導致的測定誤差減少。作 爲可進行這類測定的溫度測定裝置，例如列舉出水柱溫度 計。所謂水柱溫度計’是像在日本特公平3 - 6 9 9 7 4號公報 、日本特開2005-24303號公報、日本特開2003-185501 -23- 201236776 號公報、日本特開2006-0 1 0 1 30號公報等所已知’該溫度 計是具備有：配置在與被軋製材1相對向的位置的放射溫 度計、以及用來在被軋製材1與放射溫度計之間形成作爲 光導波路的水流（水柱）的水柱形成手段。藉由經由該水 柱而以放射溫度計檢測出來自被軋製材1的表面的放射光 ，而能以高精確度來測定入口側測定表面溫度。此時，如 上述，在配置有被軋製材溫度測定手段40的部分的台座 間下面導件3 8，設置有測溫用的孔部。 這裡的被軋製材溫度測定手段40，在被軋製材1的 寬度方向中央的位置設置有一個也可以，在被軋製材板寬 度方向並排設置複數個也可以。或者是一個能測定被軋製 材板寬度方向的溫度分佈的溫度測定手段（寬度方向溫度 計）也可以。藉此，則能測定該方向的溫度分佈，能使被 軋製材1的溫度測定的精確度提升。被軋製材溫度測定手 段40所進行的入口測測定表面溫度的測定結果，被輸入 到後述的溫度控制手段50。 在第6圖，是顯示針對不同例子的台座間冷卻裝置 6〇、及被軋製材溫度測定手段70加以說明的圖面。針對 其他部位是與上述說明共通，這裡就省略說明。 台座間冷卻裝置60，是分別配置在熱軋精加工機列 1 1的各台座之間的冷卻手段，具有：台座間上面供水手 段6 1、台座間下面供水手段62、側噴霧器63、台座間上 面導件64、及台座間下面導件65。這裡針對在台座Ilf 、與最終台座1 1 g之間配置的台座間冷卻裝置60加以說 -24- ⑤ 201236776 明。配置在其他台座間的台座間冷卻裝置也是相同的構造 0 台座間上面供水手段6 1，是在該台座間對被軋製材1 的上面側供給冷卻水的手段，具備有：冷卻集管6 1 a ;複 數列設置於冷卻集管61a的導管61b、61b、…；以及安 裝在該導管6 1 b、6 1 b…的前端的冷卻噴嘴6 1 c、6 1 c、… 。台座間上面供水手段6 1，與上述的台座間上面供水手 段3 6爲共通的構造，所以這裡省略說明。 台座間下面供水手段62，是對被軋製材1的下面側 供給冷卻水的手段，具備有：冷卻集管62a ;複數列設置 於冷卻集管62a的導管62b、62b、…；以及安裝在該導 管 62b、62b…的前端的冷卻噴嘴 62c、62c '…。台座間 下面供水手段62，與上述的台座間下面供水手段3 7爲共 通的構造，所以這裡省略說明。 側噴霧器63，是將滯留在被軋製材1的上面側的水 朝寬度方向推出以進行除水的手段，具備有：集管63a; 複數列設置於集管63a的導管63b、63b、…；以及安裝 於該導管63b、63b、…的前端的噴嘴63c、63c、…。這 裡將噴嘴63c、63c、…形成爲將水朝被軋製材1的寬度 方向噴射，而能達成除水。 台座間上面導件64，是配置在：搬運被軋製材1的 通過線的上面側的板狀的構件，將上步驟側導件64a與下 步驟側導件64b在穿過方向並排且具有預定的間隙。在該 間隙，配置有：上述側噴霧器63、與後述的被軋製材溫 -25- 201236776 度測定手段70之中的上面側被軋製材溫度測定手段70a 。在台座間上面導件64之中的上游步驟側導件64a的上 面側’配置有台座間上面供水手段61。於是，在上游步 驟側導件64a，設置有：讓來自台座間上面供水手段6 1 的冷卻水貫穿的孔部》 台座間下面導件6 5，是配置在：搬運被軋製材1的 通過線的下面側的板狀的構件，將上步驟側導件65a與下 步驟側導件6 5 b在搬運方向並排且具有預定的間隙。在該 間隙，配置有：沒有圖示的彎針（1 ο 〇 p e r )。在台座間下 面導件65之中的上游步驟側導件65a的下面側，配置有 台座間下面供水手段62。於是，在上游步驟側導件65a， 設置有：讓來自台座間下面供水手段62的冷卻水貫穿的 孔部。這裡在台座間下面導件6 5的下游步驟側導件6 5 b 的下面側，配置有：被軋製材溫度測定手段7〇之中的下 面側被軋製材溫度測定手段70b。於是，在下游步驟側導 件65b，與配置有下面側被軋製材溫度測定手段70b的位 置對應，設置有測定用的孔部。 被軋製材溫度測定手段70，具備有：上面側被軋製 材溫度測定手段7〇a及下面側被軋製材溫'度測定手段70b 。上面側被軋製材溫度測定手段70a，如上述配置在台座 間上面導件6 4間的間隙’在熱軋精加工機列1 1的最終台 座1 1 g的入口側，用來測定被軋製材1的上面側表面溫度 。在本形態’是藉由側噴霧器63 ’將滯留在被軋製材1 的上面的水去除，所以上面側被軋製材溫度測定手段7〇a -26- ⑤ 201236776 ，不考慮冷卻水，能適用平常的溫度測定感應器。上面側 被軋製材溫度測定手段70a，在被軋製材1的寬度方向中 央的位置設置有一個也可以，設置能測定被軋製材全寬度 的溫度的寬度方向溫度計也可以。藉由使用寬度方向溫度 計，則能測定寬度方向的溫度分佈，能使被軋製材的溫度 測定的精確度提升。或者也可在該寬度方向排列配置有複 數的溫度計。藉此能達到與寬度方向溫度計同樣的效果。 另一方面，下面側被軋製材溫度測定手段70b，與使 用第2圖所說明的上述的被軋製材溫度測定手段4 0共通 ，所以省略說明。 回到第1圖’繼續針對製造裝置1 0加以說明。線圈 盒1 5，是經過粗軋製後的軋製材（粗棒）一次捲繞成線 圈狀的設備。藉此，則能抑制粗棒的溫度降低。這裡能使 用習知的線圏盒，其型式並沒有特別限定。 粗棒加熱器1 6，是用來將從線圈盒1 5捲回的粗棒加 熱’將其加熱到所需要的溫度的裝置。也就是說，藉由感 應加熱、氣體燃燒加熱、通電加熱等的方法，涵蓋被軋製 材板寬度方向全體將粗棒升溫至預定溫度。粗棒加熱器， 可使用習知的構造，其類型並沒有特別限定，而由於氣體 燃燒加熱方法的燃燒效率較低，而通電加熱方法會有容易 產生瑕疵的傾向’所以感應加熱方式較佳。而感應加熱方 式的例子，例如舉例電磁線圏加熱方式（軸方向磁通加熱 )或橫向加熱方式（橫斷磁通加熱）。 除鱗機17，是用來將產生於被乳製材表背面的鱗屑 -27- 201236776 (附著物，不需要的生成物）去除的設備。具體來說’是 藉由對被軋製材表背面噴射高壓水’用其衝撞力將鱗屑去 除。 溫度控制手段5 0，其構造具備有：目標溫度運算裝 置5 1、及設備控制裝置5 2。 目標溫度運裝置5 1，是根據最終台座1 1 g的出口 側的目標溫度（出口側目標表面溫度），考慮各種溫度上 升/下降，運算最終台座1 1 g的入口側應該的被軋製材表 面溫度也就是入口側目標表面溫度的裝置。後面會敘述這 裡進行的詳細運算內容。 設備控制裝置5 2，會判斷：從目標溫度運算裝置5 1 所取得的入口側目】標表面溫度、與從被軋製材溫度測定手 段4 0取得的入口側測定表面溫度，是否一致，並且如果 不一致，則將線圈盒1 5、粗棒加熱器1 6、除鱗機1 7、及 台座間冷卻裝置3 5之中的至少一個進行控制的裝置。 藉由具有以上構造的製造裝置10，在熱軋精加工機 列1 1的出口側，配置有可從該熱軋精加工機列Π的內側 冷卻的冷卻裝置的情況，也能在熱軋精加工機列1 1的最 終台座入口側，賦予被軋製材1的目標溫度。而根據該溫 度藉由具備用來控制裝置的手段，則能進行被軋製材1的 溫度管理。 接著，將使用製造裝置1 0來製造熱軋鋼板的方法的 例子進行說明。 最初，藉由溫度控制手段50的目標溫度運算裝置5 1 -28- ⑤ 201236776 ，運算出：作爲目標的熱軋精加工機列 Π的最終台座 1 1 g的入口側溫度也就是入口側目標表面溫度。具體來說 ，根據預先給予的最終台座11 g出口側的目標溫度（出口 側目標表面溫度），考慮：最終台座1 1 g所進行的軋製的 加工發熱導致的溫度上升；工作輥1 1 gw、1 1 gw與被軋製 材1的接觸導致的溫度下降量；搬運所伴隨的氣冷；以及 從最終台座1 1 g的被軋製材溫度測定手段4 0的設置位置 起到最終台座1 1 g爲止的水冷導致的冷卻溫度下降量；而 在軋製前計算出：最終台座1 1 g入口側（被軋製材溫度測 定手段）的入口側目標表面溫度。在該入口側目標表面溫 度的計算，能使用例如下述的算式。 最終台座llg的軋製的加工發熱導致的溫度上升量^ ΤΊ，是以下面的式子（1)表示。 [數學式子1] (1) 2 cph2 wr 這裡的c是被軋製材1的比熱（J/kg · Κ ) ，p爲被 軋製材1的密度（kg/m3 ) ，7?爲加工熱效率，G爲軋製 扭矩（N.m) 爲工作輥直徑（m) ，w爲被軋製材的 板寬度（m ) ，h2爲最終台座1 1 g後的板厚度（m )。 與工作輥1 1 gw、1 1 gw的接觸導致的溫度下降量△ T2 ，是以下面的式子（2)算出。 -29- 201236776 [數學式子2 ] 這裡的C是被軋製材1的比熱（J/kg . K ) ，/〇爲被 軋製材1的密度（kg/m3 ) ，λ是被軋製材1的熱傳導率201236776 VI. Description of the Invention: [Technical Field] The present invention relates to a method for producing a hot-rolled steel sheet and a device for manufacturing a hot-rolled steel sheet, and more particularly to 'even after being rolled by a hot-rolling finishing machine The high-temperature rolled material is sprayed with cooling water to water-cool the material to be rolled, thereby producing a hot-rolled steel sheet, and it is also possible to perform appropriate temperature management of the material to be rolled. [Prior Art] Steel materials used for automobiles and structural materials are required to be excellent in mechanical properties such as strength, workability, and toughness. In order to comprehensively improve these mechanical properties, it is effective to refine the steel structure. Therefore, many methods for obtaining steel having fine texture have been explored. By the miniaturization of the structure, it is possible to obtain a high-strength hot-rolled steel sheet having excellent mechanical properties even if the amount of the alloying elements is reduced. It is known that as a method of miniaturization of a structure, in a particularly small stage of the hot rolling finishing machine, high rolling reduction is performed, the Worthfield iron particles are fined, and rolling strain is accumulated in the rolled material. The achievement is: the miniaturization of the ferrite iron obtained after rolling. Further, from the viewpoint of suppressing the recrystallization or recovery of the Worthite iron and promoting the deformation of the ferrite and iron, the method of cooling the material to be rolled to 600 ° C to 75 ° C in a short time after rolling is carried out as much as possible. very effective. That is to say, the hot rolling process is followed by a cooling device which can be cooled more quickly than in a conventional manner, and the method of rapidly cooling the rolled material after rolling is effective. In order to rapidly cool the rolled material after rolling in this manner, in order to increase the cooling energy -5 - 201236776, the cooling water s per unit area to be sprayed on the material to be rolled, that is, the way to increase the flow density is very effective. This cooling method is hereinafter referred to as immediate rapid cooling. In the manufacture of hot-rolled steel sheets, in order to finally obtain desired properties, it is important to perform temperature management of the material to be rolled as accurately as possible. Therefore, in the entire apparatus for manufacturing a hot-rolled steel sheet, a temperature measuring means for grasping the temperature of the material to be rolled at this point of time is provided. From such a viewpoint, the temperature measuring means is also provided on the outlet side of the hot rolling finishing machine, and the temperature of the material to be rolled at the time point when the rolling process is completed can be obtained. Since the temperature on the outlet side of the rolling mill has a cooling step, it is important to determine the temperature of the final target and determine the degree of cooling to obtain the temperature. However, when the water is rapidly cooled after the rolling process as described above, the temperature of the material to be rolled cannot be measured at the exit side of the rolling machine. In order to solve this problem, Patent Document 1 discloses means for obtaining the temperature on the exit side of the rolling mill. Therefore, the measurement of the temperature at the exit side of the rolling mill by the thermometer provided on the exit side of the final pedestal of the hot rolling finishing machine has not been measured by the cooling water, so it is described in the hot rolling finishing machine. The final pedestal inlet side is a technique for measuring the temperature of the material to be rolled. [Prior Art Document] [Patent Document] Patent Document 1: Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. The final pedestal inlet side temperature corresponding to the final pedestal outlet side temperature is recorded, but it is not disclosed how the temperature is actually calculated, and the temperature at the final pedestal inlet side temperature cannot be used for temperature control. Therefore, the present invention has been made in view of the above problems, and an object of the invention is to provide a method for producing a hot-rolled steel sheet and a device for producing a hot-rolled steel sheet, which can be carried out from a hot-rolling finishing machine column even if it is disposed in a hot-rolled steel sheet manufacturing line. In the case of the cooled cooling device, the target temperature can also be given to the temperature of the material to be rolled between the final pedestals in the hot rolling finishing machine train. [Means for Solving the Problems] Hereinafter, the present invention will be described. Although the symbols attached to the drawings are written in parentheses for the sake of easy understanding, the present invention is not limited thereto. The invention described in claim i is a method for producing a hot-rolled steel sheet. For the inside of the final pedestal on the downstream step side of the final pedestal of the hot-rolling finishing machine train (1 1 ), the cooling water will be sprayed. The material to be rolled is rapidly cooled and the surface temperature of the material to be rolled is measured at the inlet side of the final pedestal to obtain the surface temperature of the inlet side. The target surface temperature of the material to be rolled from the outlet side of the final pedestal is the target surface temperature at the outlet side. According to: the temperature rise caused by the processing heat caused by the rolling of the final pedestal, the temperature drop caused by the contact between the work rolls of the final pedestal and the material to be rolled, and the measurement position of the surface temperature measured from the inlet side to the work roll of the final pedestal The temperature drop caused by the air-cooling of the conveyance of 201236776 is calculated; the target surface temperature of the material to be rolled which is the measurement position of the inlet side measurement surface temperature is calculated, that is, the inlet-side target surface temperature. In the method for producing a hot-rolled steel sheet according to the first aspect of the invention, in the method for producing a hot-rolled steel sheet according to the first aspect of the invention, when the inlet-side target surface temperature is calculated, the surface temperature of the material to be rolled in the rolling direction is also included. Elements. In the method of manufacturing the hot-rolled steel sheet according to the first or second aspect of the invention, the rolling of the hot-rolling finishing machine (1 1 ) is performed in the invention. In the rolling method in which the rolling reduction ratio of the rolling mill is changed during the rolling, when the inlet-side target surface temperature is calculated, the elements also include changes in the thickness of the sheet due to the change in the pressing ratio, and the material to be rolled and worked. The change in the coefficient of friction of the rolls. In the method for producing a hot-rolled steel sheet according to any one of claims 1 to 3, the material to be rolled is cooled by cooling water at the inlet side of the final pedestal. When the inlet-side target surface temperature is calculated, the element also includes a temperature drop due to water cooling during transportation from the measurement position of the surface temperature to the work roll of the final pedestal. In the method for producing a hot-rolled steel sheet according to any one of the first to fourth aspects of the invention, the method for measuring the surface temperature of the inlet side is disposed in the material to be rolled. The thermometer and the thermometer in the opposite position of the surface are arranged in a plurality of widths in the width direction of the rolled material, or a width direction thermometer. In the method for producing a hot-rolled steel sheet according to any one of the first to fifth aspects of the invention, the method for measuring the surface temperature of the inlet side is a water column thermometer, the water column. The thermometer includes a radiation thermometer disposed at a position facing the surface of the material to be rolled, and a water column forming means for forming a water flow as an optical waveguide between the material to be rolled and the radiation thermometer. In the method for producing a hot-rolled steel sheet according to any one of the first to sixth aspects of the invention, the inlet side target surface temperature and the measured inlet side are calculated. The surface temperature is measured, and the inlet-side target surface temperature is compared with the inlet-side measured surface temperature to allow the inlet side to measure the surface temperature as the inlet-side target surface temperature, and the command is sent to: coil case, thick rod heater, descaling At least one of the machine and the inter-station cooling device. In the method for producing a hot-rolled steel sheet according to any one of the first to seventh aspects of the present invention, in the method of manufacturing the hot-rolled steel sheet according to any one of the first to seventh aspects of the present invention, the rapid acceleration can be performed without rapid cooling. The surface temperature of the rolled material is measured by measuring the surface temperature of the rolled material in the cooling section or later. In the method for producing a hot-rolled steel sheet according to any one of the eighth aspect of the invention, the method of measuring the surface temperature of the inlet side and the surface temperature after rolling, the final pedestal is calculated. The surface temperature of the material to be rolled on the outlet side is compared with the surface temperature of the material to be rolled at the final pedestal outlet side obtained by the calculation process of the target surface temperature at the inlet side, and based on the error, The calculation of the inlet side target surface temperature of -9-201236776 is changed. The invention described in the first aspect of the invention is a method for producing a hot-rolled steel sheet, and the inside of the final pedestal on the downstream step side of the final pedestal of the hot-rolling finishing machine train (1 1 ) is sprayed with cooling water. The rolled material is rapidly cooled, and the surface temperature of the material to be rolled is measured on the inlet side of the final pedestal, and the surface temperature of the inlet side is measured, and the temperature of the inlet side target surface to be previously administered is compared with the inlet side measurement surface temperature to allow the inlet side The method of measuring the surface temperature to the inlet-side target surface temperature is performed, and the command is sent to at least one of a coil case, a thick rod heater, a descaler, and a cooling device between the stages. The invention according to the first aspect of the invention is a manufacturing apparatus 10 for a hot-rolled steel sheet having a hot-rolling finishing machine train (11), which is provided with a downstream step of a final pedestal arranged in a hot-rolling finishing machine train. The side is disposed at least partially on the inner side of the final pedestal, and the immediate rapid cooling device (20) that can spray the cooling water is placed on the inlet side of the final pedestal to measure the temperature of the material to be rolled to measure the surface temperature of the material to be rolled. The means (40) and the target surface temperature of the material to be rolled from the exit side of the final pedestal, that is, the target surface temperature at the outlet side, the temperature rise due to the processing heat caused by the final pedestal rolling, and the final pedestal work. The temperature drop caused by the contact between the roll and the material to be rolled, and the measurement of the surface temperature from the inlet side to the temperature drop caused by the air cooling of the conveyance of the final pedestal work roll; The target surface temperature of the material to be rolled is also the target temperature computing device (51) of the inlet-side target surface temperature. In the manufacturing apparatus (10) of the hot-rolled steel sheet according to any one of the above claims, the target temperature calculation device (5 1 ) calculates the entrance. At the side target surface temperature, calculation of an element including a change in the surface temperature of the material to be rolled in the rolling direction can be performed. In the invention of the hot-rolled steel sheet according to the eleventh or thirteenth aspect of the invention, the hot-rolling finishing machine (1 1 ) is in the middle of rolling. When the rolling ratio of the rolling mill is changed during the rolling, the target temperature calculating device (51) may calculate the inlet-side target surface temperature, and may include: The calculation of the change in the thickness of the sheet due to the change in the reduction ratio and the change in the coefficient of friction of the rolled material and the work roll. The invention of the hot-rolled steel sheet manufacturing apparatus (10) according to any one of claims 11 to 13 of the invention is also provided on the inlet side of the final pedestal (1 1 g ). There is: a cooling device (35) that can spray cooling water onto the material to be rolled, and a target temperature computing device (51), when calculating the temperature of the inlet-side target surface, can be calculated: because the cooling device provided on the inlet side of the final pedestal leads to being The temperature of the rolled material is lowered. In the apparatus for manufacturing a hot-rolled steel sheet according to any one of the first to fourth aspects of the invention, the apparatus for measuring the temperature of the rolled material (40) Is a thermometer placed at a position facing the surface of the material to be rolled, and the thermometer is arranged in a plurality of width directions in the width direction of the material to be rolled, or a width direction thermometer -11 - 201236776 Patent application No. 16 In the apparatus for manufacturing a hot-rolled steel sheet according to any one of the first to fifth aspects of the invention, the material for measuring the temperature of the rolled material (40) is a water column thermometer. The water column thermometer includes a radiation thermometer disposed at a position facing the surface of the material to be rolled, and a water column forming means for forming a water flow as an optical waveguide between the material to be rolled and the radiation thermometer. In the apparatus (10) for manufacturing a hot-rolled steel sheet according to any one of the above-mentioned claims, the present invention is further provided with a coil case (1 5). At least one of the thick rod heater (16), the descaler (17), and the inter-station cooling device (35), the target temperature computing device (5 1 ) can control: the coil box provided At least one of a thick rod heater, a descaler, and an inter-station cooling device. In the invention of the hot-rolled steel sheet manufacturing apparatus (1 1 〇) according to any one of the claims 1 to 17 of the invention, the rapid cooling device (20) is immediately applied. In the inside or on the exit side of the rapid cooling device, means for measuring the temperature of the material to be rolled is disposed. In the invention of the hot-rolled steel sheet according to any one of the eighteenth aspects of the invention, the target temperature calculation device (5 1 ) is : the rolled material temperature measuring means (40) and the hand -12- 5. which is disposed in the immediate rapid cooling device (20) or immediately on the exit side of the rapid cooling device for measuring the temperature of the material to be rolled. In the period of 201236776 (1 40 ), the surface temperature of the material to be rolled at the exit side of the final pedestal (1 1 g ) is calculated as a result of the temperature measurement, and the calculated surface temperature and the target surface temperature at the inlet side are calculated. The surface temperature of the material to be rolled at the final pedestal exit side obtained by the process is compared, and the calculation of the inlet-side target surface temperature can be changed according to the error. Advantageous Effects of Invention According to the method for producing a hot-rolled steel sheet according to the present invention and the apparatus for producing a hot-rolled steel sheet, a cooling device capable of cooling from the row of the hot-rolling finishing machine is disposed on the outlet side of the hot-rolling finishing machine row. In the case of the rolled material temperature between the final pedestals of the hot rolling finishing machine, the target temperature can also be given. The temperature management of the material to be rolled can also be carried out by means of a means for controlling the target temperature to be supplied. [Embodiment] The above-described actions and advantages of the present invention can be understood from the embodiments described below for carrying out the invention. The invention will now be illustrated in accordance with the embodiments shown in the drawings. However, the invention is not limited by the embodiment. Fig. 1 is a view for explaining a manufacturing apparatus 10 (hereinafter referred to as "manufacturing apparatus 10") of the hot-rolled steel sheet according to the first embodiment. In the table 1, the material to be rolled 1 is conveyed from the left side (upstream side, upstream step side) to the right side (downstream side downstream side), and the upper and lower sides of the paper are in the wrong direction. Here, the passing line is shown by a broken line. The upstream side (upstream step side)/downstream side (downstream step side) direction is described as the passing direction, and -13-201236776 is orthogonal to the direction, and the plate of the material to be rolled which passes through is the width direction of the material to be rolled. In the drawings, the description is omitted for easy viewing. As shown in Fig. 1, the manufacturing apparatus 10 is provided with a thick rod heater 16 , a descaler 17 , a hot rolling finishing machine array 2 2 , 1 2 ..., a pinch roller 13 , and an immediate rapid cooling. The apparatus manufacturing apparatus 10, the inter-seat cooling apparatus 35 of each pedestal of the hot-rolling finishing machine row 1 1 , and the temperature control means for manufacturing the apparatus at the inlet side material temperature measuring means 40» of the final pedestal 1 1 g 5 0. Although illustration and description are omitted, a heating furnace or a rough rolling mill train is disposed on the side of the coil case 15 , and on the other hand, the roller 13 is disposed on the downstream side, and is provided with a thermal cycle cooling device and a hot rolled steel sheet. It is manufactured substantially in the following manner. That is, the hot furnace is taken out, and the rough rolling mill is rolled to a rough temperature control of a predetermined thickness while continuously arranging it to a predetermined thickness by a hot rolling finishing machine. Then, the device 20 is rapidly cooled immediately. Then, the pinch rolls 13 are cooled by thermal cycle to a predetermined winding temperature, and are wound into a wire by a winder to explain the detailed manufacturing method. The manufacturing device 10 will be described in detail below. In the second drawing, the pedestal 1 1 f of the hot rolling finishing machine row 1 1 , the final ancient moment rapid cooling device 20 , and the positional direction of the pinch roller 13 are described, and the repeated coil coils 15 are 1 1. Handling roller 2 0. In addition, there is a table in the system that is rolled 1 〇, and there is a further upstream step. In the case of a pinch or a winding machine, it will be rolled from the side of the bar to the inside and then cooled rapidly. shape. In the back, it is the -14- 5 201236776 picture showing the 1st 1 1 g and the vertical display. Figure 3 is a view further focusing on the exit side of the final pedestal 1 1 g. The hot rolling finishing machine column 1 1 is a rolling mill 11a which is arranged side by side along the passing direction. . . . . Ilf, llg. Each rolling mill 11a. . . . . In the rolling mills constituting the so-called pedestals, llf and llg are set so that the rolling conditions such as the rolling reduction ratio can satisfy the thickness, mechanical properties, surface quality and the like required for the final product. Here, the reduction ratio of each pedestal is set to: Compliance with the performance of the rolled material to be produced, and high rolling down to achieve the fineness of the Worthite iron grain and the rolling strain From the viewpoint of accumulating the material to be rolled and miniaturizing the iron particles obtained after rolling, the final pedestal, that is, the pedestal 11g, is preferably as large as possible. The rolling mill of each pedestal has: a pair of working lights llaw, llaw, ..., llfw, llfw, llgw, 1 lg W which are actually clamped and pressed down by the rolled material; and are arranged such that the outer circumferences are connected to each other A pair of support rollers of the work roll 1 1 ab, 1 1 ab. . . . . 1 1 fb, 1 1 fb, 1 1 gb, 1 1 gb. The rolling mill for each pedestal includes: the work roll and the support roll are included inside, and the outer casing of the rolling mill is formed to support the casing of the rolling roll 1 1 ah. . . . . 1 1 fh, 1 1 gh. The housing has a pair of upright portions llgr and llgr which are disposed opposite to each other, and the erected portions llgr and llgr are arranged in pairs and are erected so as to be passed through in the width direction of the material to be rolled. The rolled material 1 is sandwiched. Here, in the second figure, the axial center of the work roll 1 1 gw of the final pedestal 1 1 g shown by L 1 is separated from the downstream end side end face of the housing erecting portion 1 1 gr by -15 - 201236776, which is larger than the work. The radius rl of the roller llgw. Then, at a portion corresponding to L1 - rl, a part of the cooling device 20 can be rapidly cooled as will be described later. That is, a part of the immediate rapid cooling device 20 can be disposed to be inserted inside the casing 1 lgh. The conveying rollers 1, 2, 12, ... are the roller groups for transporting the material to be rolled 1 in the passing direction. The pinch roller 13 is also provided as a downstream function on the downstream side of the rapid cooling device 20 as a function of water removal. By this, it is possible to prevent the cooling water sprayed in the rapid cooling device 20 from flowing out toward the downstream step side of the material 1 to be rolled. Further, the undulation of the material to be rolled 1 on the rapid cooling device 20 is prevented, and the traversability of the material to be rolled 1 can be improved particularly at the time before the tip end of the material 1 to be rolled is bitten into the winding device. Here, the upper roller 1 3 a among the rolls of the pinch roller 13 can be moved up and down as shown in Fig. 2 . Immediately the rapid cooling device 20 is provided with: the above water supply means 2 1 , 21. . . . . The following water supply means 22, 22. . . . . The upper guides 25, 25, ..., and the lower guides 30, 30, .... The upper water supply means 2 1 , 2 1 , ... are means for supplying cooling water to the upper surface side of the material to be rolled 1, and include cooling headers 2 1 a, 2 1 a , ...; and a plurality of columns arranged for each cooling The ducts 21b, 2 1 b, ... of the headers 21a, 21a, ...; and the cooling nozzles 21c, 21c, ... mounted on the tips of the ducts 2 1 b, 2 1 b, .... The cooling header 21a is a pipe extending in the width direction of the material to be rolled, and the cooling headers 21a' 21a, ... are arranged side by side in the passing direction. -16- 201236776 The ducts 2 1 b, 2 1 b, ... are a plurality of thin pipes that are diverged from each of the cooling headers 2 1 a. The open end of the ducts is directed toward the upper side of the material to be rolled 1 (through the line) Above side). The ducts 2 1 b, 2 1 b, ... are arranged in the tube length direction of the cooling header 21a, that is, in the width direction of the material to be rolled, and are comb-shaped. Cooling nozzles 21c, 21c, ... are attached to the tips of the respective ducts 21b, 21b, .... The cooling nozzles 21c and 21c of the present embodiment are flat-type spray nozzles that can form a fan-shaped cooling water jet (for example, a thickness of about 5 mm to about 30 mm). In Figs. 4 and 5, a schematic diagram of a cooling water jet formed on the surface of the material to be rolled by the cooling nozzles 2 1 c, 2 1 c, ... is shown. Figure 4 is a perspective view. Fig. 5 is a view schematically showing the collision type when the jet collides against the surface of the material to be rolled. In Fig. 5, the white circle shows the position immediately below the cooling nozzles 2 lc, 2 1 c, ..., and the thick line shows the collision position and shape of the cooling water jet. In Figs. 4 and 5, the passing direction is displayed together with the width direction of the material to be rolled. In the present embodiment shown in Figs. 4 and 5, the adjacent nozzle rows are arranged such that the positions in the width direction of the material to be rolled are shifted, and the adjacent nozzle rows and the width of the material to be rolled are arranged. The direction positions are the same, which is a so-called staggered arrangement. In the present embodiment, all the positions in the width direction of the material to be rolled of the surface of the material to be rolled are covered, and the cooling nozzles 2 1 c, 2 1 c are disposed so that the cooling water jets belonging to the same nozzle row can pass at least twice. ,... That is, the point ST of the material to be rolled which has passed through moves along the straight arrow of Fig. 5. At this time, in the nozzle row A twice (A1, A2), the nozzle column -17-201236776 B twice (B1, B2), the nozzle row C twice (Cl, C2) ..., in the nozzle column to let it belong to The jet of the nozzle of the nozzle row collides twice. Therefore, the cooling nozzles 2 1 c, 2 1 c, ... are arranged such that the interval Pw between the cooling nozzles 2 1 c, 2 1 c, ..., the collision width L of the cooling water jet, and the torsion angle / 3 are established: L = 2Pw / cos β relationship. Although it is passed twice, it is not limited to this, and it can also be made to pass three times or more. From the viewpoint of achieving uniformization of the cooling capacity in the width direction of the rolled material, the nozzle rows adjacent in the passing direction are twisted in opposite directions from each other in the opposite directions of the nozzles 2 1 c, 2 1 c, .... The "uniform cooling width" with respect to the cooling of the material to be rolled is determined by the arrangement of the nozzles. This represents the nature of the nozzle group to be arranged, and the size of the material to be rolled in the direction in which the rolled material to be conveyed is uniformly cooled. Specifically, it is generally the same as the width of the largest material to be rolled which can be produced in the apparatus for manufacturing a material to be rolled. Specifically, it is, for example, the size shown by RH in Fig. 5. In the present embodiment, in the nozzle row adjacent to the above, the cooling nozzles 2 1 c, 2 1 c, ... are twisted in mutually opposite directions, and the present invention is not limited thereto. A form that is twisted in the same direction. The torsion angle (the above 0) is not necessarily limited, and may be appropriately determined from the viewpoints of required cooling capacity, storage of equipment, and the like. In the present embodiment, although from the viewpoint of the above advantages, it will be worn -18- 5. 201236776 The nozzle rows adjacent to each other are arranged in a staggered pattern. However, the cooling nozzles may be arranged in the passing direction along the straight line and provided with the upper water supply means 2 1 'in particular, the nozzles 2 1 c The position of 2 1 c, . . . is not particularly limited to be configured such that the final pedestal 11 of the hot rolling finishing machine row 11 is as close as possible to the working roller 1 of the seat 1 1 a from the inside of the casing llgh of the final pedestal 11g 1 g W. By the arrangement of the rolled material 1 after rolling in the finisher row 11 in this manner, the leading end portion of the rolled material 1 can be stabilized and guided to 20. In the present embodiment, as shown in Fig. 2, the approaching work roll cooling nozzles 2 1 c, 2 1 c, ... are arranged close to the material 1 to be rolled, and from the respective cooling nozzles 2 1 c, 2 1 c, ... The direction of the cooling water sprayed by the cooling is substantially in the vertical direction ', from the work rolls 1 1 gw, 1 1 gw of the final pedestal 1 1 gw, the nozzles 2 1 c, 2 1 c, ... 22c, 22c, ... It is preferable that the cooling water to be carried out is more inclined to the working rolls by 1 gw and 1 1 gw in the vertical direction, so that the time from the start of pressing the rolled material 1 at the final pedestal 1 1 g can be further shortened. The time required for the strain recovery due to rolling can be made substantially zero. Thus, a rolled material having a structure can be produced. The following water supply means 22, 22. . . . . The means for supplying the cooling water to the material to be rolled is provided with a cooling header 22a': the plurality of rows of the cooling headers 22a, 22a, ... are not limited to each other, and the cold type is arranged. After g, the final stage can hot-roll the rapid cooling cooling device 1 1 gw of the hydrophobic jet on the other hand near the cooling jet, direction. The cooling that is borrowed by cooling has a finer 1 below 2 2a ' . • Tubes 22b, -19- 201236776 22b, ...; and cooling nozzles 22c, 22c, ... attached to the tips of the ducts 22b, 22b, .... The following water supply means 22, 22. . . . . The above-described water supply means 2 1 , 2 1 , ... are arranged to face the above-described water supply means 2 1 , 2 1 , ..., and the cooling water is sprayed in the same direction as the upper water supply means 2 1 , 2 1 , ..., and thus the description thereof is omitted. Next, the above guides 25, 25, ... will be described. The upper guides 2 5, 2 5, ... are plate-shaped members, and are disposed between the upper water supply means 21 and the workpiece 2 to be conveyed, and are arranged to pass the front end of the material 1 to be rolled. The front end of the rolled material does not get caught in the conduits 2 1 b, 2 1 b , ... or the cooling nozzles 2 〖c, 21c. On the other hand, the upper guides 25, 25, ... are provided with flow holes through which the jet flow from the upper water supply means 21 passes. Thereby, the jet flow from the upper water supply means 21 is passed through the upper guides 25, 25, ... to the upper surface of the material to be rolled 1, and appropriate cooling can be performed. The shape of the upper guide member 25 used herein is not particularly limited, and a conventional upper guide member can be used. The upper guide 25, 25. . . . . Configured as shown in Figure 2. In the present embodiment, three upper guides 25, 25, 25 are used, which are arranged side by side in the passing direction. Any of the upper guides 25, 25, 25 is configured to correspond to the height direction position of the cooling nozzles 2 1 c, 2 1 c, . That is, in the present embodiment, the upper guide 25 which is closest to the work roll 11gw of the final pedestal 11g is disposed so as to be inclined such that the end portion on the final pedestal 丨丨g side is lower and the other end side is higher. The other two upper guides 25, 25 are arranged to have a predetermined spacing from the passing surface and substantially parallel to the passing surface. The lower guide 30 is a plate-shaped member disposed between the lower water supply means 2 2 and the conveyed -20-201236776 rolled material 1. Thereby, it is possible to prevent, in particular, when the material to be rolled 1 passes through the manufacturing apparatus 10, the foremost end of the material to be rolled 1 is caught to the lower water supply means 22, 22, ... or the conveying roller 1 2, 1 2, ... . The situation. On the other hand, the lower guide 30 is provided with an inflow hole through which the jet flow from the lower water supply means 2 2 passes. Thereby, the jet flow from the lower water supply means 22 is passed through the lower guide 30 to reach the lower surface of the material to be rolled 1, and appropriate cooling can be performed. The shape of the lower guide 30 is not particularly limited, and a conventional guide can be used. The lower guide 30 is arranged as shown in Fig. 2. In the present embodiment, four lower guides 30, 30, ... are used to be disposed between the respective conveyance rollers 1, 2, 2, and 12. Any of the lower guides 30, 30, ... is disposed so as not to be too low in height with respect to the upper end portions of the conveyance rollers 1, 2, 1, 2, etc. In the present embodiment, the following guides 3 are provided. For the example of 0, it is not necessary to set the following guides. In the supply of the cooling water as described above, the specific amount of the supplied water is appropriately determined depending on the required cooling heat of the material to be rolled, and is not particularly limited. However, as described above, since rapid cooling after rolling is effective from the viewpoint of miniaturization of the material to be rolled, it is preferable to supply cooling water having a high water density. From the viewpoint of the miniaturization of the material to be rolled, the amount of water of the cooling water supplied to each of the faces is, for example, 1 〇 to 2 5 m 3 / ( m 2 ·min). A larger water density can also be used. As the cooling capacity, the rolled material of 3 mm thick is preferably 600 ° C / sec or more. Return to Fig. 1 to Fig. 3, and continue to explain the manufacturing apparatus 1 - -21 - 201236776. The inter-station cooling device 35 is a cooling means disposed between the pedestals of the hot-rolling finishing machine row 11, and has a pedestal upper water supply means 36, a pedestal lower water supply means 37, and a pedestal lower guide 38. . Here, the gantry cooling device 35 disposed between the pedestal 1 1 f and the final pedestal 1 1 g will be described. The inter-station cooling device disposed between the other pedestals has the same configuration. The pedestal upper water supply means 36 is a means for supplying cooling water to the upper surface side of the material to be rolled 1 between the pedestals, and includes a cooling header 36a: a plurality of conduits 36b' 36b provided in the cooling header 36a, ... And the cooling nozzles 36c, 36c, ... installed at the front end of the ducts 36b, 36b, ..., the cooling header 36a is a pipe extending in the width direction of the material to be rolled, the ducts 36b, 36b. . . . . It is formed by a plurality of thin pipes which are branched from the cooling header 36a, and the opening end thereof faces the upper surface side of the material to be rolled. The ducts 36b, 36b, ... are disposed along the length of the tube of the cooling header 36a, that is, in the width direction of the material to be rolled, and have a comb shape. Cooling nozzles 36c, 36c, ... are attached to the tips of the respective conduits 36b, 36b, .... The cooling nozzles 36c and 36c of the present embodiment are flat-type spray nozzles that can form a fan-shaped cooling water jet (for example, a thickness of about 5 mm to 30 mm). The pedestal lower water supply means 37 is a means for supplying cooling water to the lower surface side of the material to be rolled 1, and includes: a cooling header 37a; a plurality of conduits 37b, 37b, ... provided in the cooling header 37a; Cooling nozzles 3 7 c, 3 7 c, ... at the front end of the ducts 3 7 b, 3 7 b.... Between the pedestal -22- 5 201236776, the water supply means 3 7 is disposed so as to face the above-described pedestal upper water supply means 36, and although the cooling water is sprayed in the same direction, it is substantially the same as the pedestal upper water supply means 36, so here The description is omitted. The inter-station lower guide 38 is a plate-shaped member disposed below the passing line for conveying the rolled material 1, and the upstream step side guide 38a and the downstream step side guide 38b are disposed to have a predetermined direction in the conveyance direction. Clearance. In the gap </ RTI>, a looper (not shown) and a lower water supply means 37 are provided between the pedestals. Thereby, the function of the water supply means between the looper or the pedestal is not hindered, and the material to be rolled 1 can be appropriately guided. Here, the downstream step side guide 3 8b ' of the lower water supply means 37 is disposed corresponding to a position where the material to be rolled material 4 后 to be described later is disposed, and a hole for measurement is provided. The material to be rolled 40 is placed on the lower side of the material to be rolled i on the inlet side of the final pedestal 1 1 g of the hot rolling finishing machine row 11 to measure the surface temperature of the material to be rolled 1 ( The inlet side measures the surface temperature). The material to be rolled 40 is not limited to a specific type as long as it can measure the surface temperature of the inlet side. However, in the present embodiment, it is considered that the cooling water is retained on the surface of the material to be rolled 1 by the above-described inter-station cooling device 35, and it is preferable to reduce the measurement error due to the injected cooling water. . As the temperature measuring device capable of performing such a measurement, for example, a water column temperature meter is cited. The so-called water column thermometers are as disclosed in Japanese Patent Publication No. 3-6999, Japanese Laid-Open Patent Publication No. 2005-24303, Japanese Laid-Open Patent Publication No. 2003-185501-23-201236776, and Japanese Patent Laid-Open No. 2006-0 1 0 It is known that the thermometer is provided with a radiation thermometer disposed at a position facing the material to be rolled 1 and a water flow for forming an optical waveguide between the material to be rolled 1 and the radiation thermometer. Water column) means of water column formation. By detecting the emitted light from the surface of the material to be rolled 1 by the radiation thermometer through the water column, the inlet side measurement surface temperature can be measured with high accuracy. At this time, as described above, the inter-seat lower guide 3 8 in the portion where the rolled material temperature measuring means 40 is disposed is provided with a hole for temperature measurement. The rolled material temperature measuring means 40 may be provided at one position in the center in the width direction of the material to be rolled 1, and a plurality of them may be arranged side by side in the width direction of the material to be rolled. Alternatively, it may be a temperature measuring means (width direction temperature meter) capable of measuring the temperature distribution in the width direction of the rolled material. Thereby, the temperature distribution in this direction can be measured, and the accuracy of the temperature measurement of the material to be rolled 1 can be improved. The measurement result of the inlet measurement surface temperature measured by the rolled material temperature measuring means 40 is input to the temperature control means 50 which will be described later. Fig. 6 is a view showing the inter-station cooling device 6A and the material to be measured by the rolled material temperature 70 for different examples. The other parts are common to the above description, and the description thereof will be omitted. The inter-station cooling device 60 is a cooling means disposed between the pedestals of the hot-rolling finishing machine row 1 1 , and includes: a pedestal upper water supply means 6 1 , a pedestal lower water supply means 62, a side sprayer 63, and a pedestal The upper guide 64 and the lower guide 65 between the pedestals. Here, the inter-seat cooling device 60 disposed between the pedestal Ilf and the final pedestal 1 1 g is described as -24-5 201236776. The inter-seat cooling device disposed between the other pedestals has the same structure. The pedestal upper water supply means 6 1 is a means for supplying cooling water to the upper surface side of the material to be rolled 1 between the pedestals, and includes a cooling header 6 1 . a; a plurality of rows of conduits 61b, 61b, ... disposed in the cooling header 61a; and cooling nozzles 6 1 c, 6 1 c, ... attached to the tips of the conduits 6 1 b, 6 1 b, . Since the pedestal upper water supply means 161 and the above-described pedestal upper water supply means 36 are common structures, the description thereof is omitted here. The pedestal lower water supply means 62 is means for supplying cooling water to the lower surface side of the material to be rolled 1, and includes: a cooling header 62a; a plurality of conduits 62b, 62b, ... provided in the cooling header 62a; Cooling nozzles 62c, 62c' of the tips of the conduits 62b, 62b, .... Between the pedestal The lower water supply means 62 has a structure common to the above-described pedestal lower water supply means 37, and therefore the description thereof will be omitted. The side sprayer 63 is a means for pushing water which is retained on the upper surface side of the material to be rolled 1 in the width direction to remove water, and includes: a header 63a; and a plurality of conduits 63b, 63b, ... provided in the header 63a; And nozzles 63c, 63c, ... attached to the tips of the ducts 63b, 63b, .... Here, the nozzles 63c, 63c, ... are formed so that water is sprayed toward the width direction of the material to be rolled 1, and water removal can be achieved. The inter-station upper guide 64 is a plate-shaped member disposed on the upper side of the passing line of the rolled material 1, and the upper step side guide 64a and the lower step side guide 64b are arranged side by side in the passing direction and have a predetermined Clearance. In the gap, the side-side atomizer 63 and the upper-side rolled material temperature measuring means 70a among the rolling material temperature-25-201236776 degree measuring means 70 to be described later are disposed. An inter-seat upper surface water supply means 61 is disposed on the upper side ' of the upstream step side guide 64a among the pedestal upper guides 64. Then, the upstream step side guide 64a is provided with a hole portion Between the pedestal upper water supply means 6 1 through which the cooling water penetrates, and the inter-seat lower guide 65 is disposed to convey the passing line of the rolled material 1 The plate-like member on the lower side has the upper step side guide 65a and the lower step side guide 6 5b side by side in the conveying direction and has a predetermined gap. In this gap, a looper (1 ο 〇 p e r ) not shown is arranged. A pedestal lower water supply means 62 is disposed on the lower surface side of the upstream step side guide 65a among the pedestal lower guides 65. Then, in the upstream step side guide 65a, a hole portion through which the cooling water from the inter-station lower water supply means 62 is inserted is provided. Here, on the lower surface side of the downstream step side guide 6 5 b of the lower stage guide 6 5 of the pedestal, the lower side rolled material temperature measuring means 70b among the rolled material temperature measuring means 7 is disposed. Then, the downstream step side guide 65b is provided with a hole for measurement corresponding to the position where the lower side rolled material temperature measuring means 70b is disposed. The material to be rolled material 70 is provided with an upper surface side rolled material temperature measuring means 7a and a lower side rolled material temperature measuring means 70b. The upper side rolled material temperature measuring means 70a, as described above, is disposed between the pedestal upper guides 64 on the inlet side of the final pedestal 1 1 g of the hot rolling finishing machine row 1 for measuring the material to be rolled. The upper side surface temperature of 1. In the present embodiment, the water remaining on the upper surface of the material to be rolled 1 is removed by the side atomizer 63'. Therefore, the upper side side is subjected to the rolling material temperature measuring means 7〇a -26- 5 201236776, and the normal temperature is not considered, and the normal temperature can be applied. Temperature measurement sensor. The upper side rolled material temperature measuring means 70a may be provided at one of the positions in the width direction of the material to be rolled 1, and may be provided with a width direction thermometer capable of measuring the temperature of the entire width of the material to be rolled. By using the width direction temperature meter, the temperature distribution in the width direction can be measured, and the accuracy of the temperature measurement of the material to be rolled can be improved. Alternatively, a plurality of thermometers may be arranged in the width direction. Thereby, the same effect as the width direction thermometer can be achieved. On the other hand, the lower side rolled material temperature measuring means 70b is the same as the above-described rolled material temperature measuring means 40 described with reference to Fig. 2, and therefore the description thereof will be omitted. Returning to Fig. 1, the description will continue with respect to the manufacturing apparatus 10. The coil case 15 is a device in which a rolled material (thick rod) which has been subjected to rough rolling is once wound into a coil shape. Thereby, the temperature drop of the thick rod can be suppressed. Here, a conventional wire cassette can be used, and the type thereof is not particularly limited. The thick rod heater 16 is a means for heating the thick rod that is rolled back from the coil case 15 to heat it to a desired temperature. In other words, the thick rod is heated to a predetermined temperature by the method of induction heating, gas combustion heating, electric heating, or the like, covering the entire width direction of the rolled material. The thick rod heater can be of a conventional construction, and the type thereof is not particularly limited. However, since the combustion efficiency of the gas combustion heating method is low, and the electric heating method tends to cause enthalpy, the induction heating method is preferable. Examples of the induction heating method are, for example, a magnet wire heating method (axial direction magnetic flux heating) or a lateral heating method (transverse magnetic flux heating). The descaler 17 is a device for removing scales -27-201236776 (attachment, unnecessary product) which is generated on the back surface of the surface of the milk material. Specifically, the scale is removed by injecting high-pressure water to the back surface of the rolled material. The temperature control means 50 has a structure including a target temperature calculating means 5 1 and a device control means 52. The target temperature transport device 5 1 is based on the target temperature of the outlet side of the final pedestal 1 1 g (the exit-side target surface temperature), and the temperature of the workpiece to be rolled on the inlet side of the final pedestal 1 1 g is calculated in consideration of various temperature rise/falls. The temperature is also the means of the target surface temperature at the inlet side. The details of the operations performed here will be described later. The device control device 52 determines whether the inlet surface temperature obtained from the target temperature calculation device 5 1 and the inlet side measurement surface temperature obtained from the material to be rolled material temperature 40 are the same, and if If they do not match, at least one of the coil case 15 , the thick rod heater 16 , the descaler 17 , and the inter-station cooling device 35 is controlled. According to the manufacturing apparatus 10 having the above configuration, a cooling device that can be cooled from the inside of the hot rolling finishing machine row is disposed on the outlet side of the hot rolling finishing machine row 1 and can also be hot rolled. The final pedestal inlet side of the processing machine array 11 gives the target temperature of the material to be rolled 1. According to this temperature, by means of means for controlling the device, temperature management of the material 1 to be rolled can be performed. Next, an example of a method of manufacturing a hot-rolled steel sheet using the manufacturing apparatus 10 will be described. Initially, by the target temperature computing device 5 1 -28- 5 201236776 of the temperature control means 50, it is calculated that the inlet side temperature of the final pedestal 1 1 g of the target hot rolling finishing machine is also the inlet side target surface. temperature. Specifically, according to the target temperature (exit side target surface temperature) on the outlet side of the final pedestal 11 g, which is given in advance, consider the temperature rise caused by the processing heat of the rolling performed by the final pedestal 1 1 g; the work roll 1 1 gw , the temperature drop caused by the contact of the 1 1 gw with the material to be rolled 1; the air cooling accompanying the conveyance; and the position from the final stage 1 1 g of the material to be rolled material measuring means 40 to the final pedestal 1 1 g The amount of cooling temperature drop due to water cooling until then; before the rolling, the inlet-side target surface temperature of the inlet side of the final pedestal (1 1 g of the material to be rolled) was calculated. For the calculation of the target side surface temperature on the inlet side, for example, the following formula can be used. The amount of temperature rise caused by the heat generation of the rolling of the final pedestal 11g is expressed by the following formula (1). [Math 1] (1) 2 cph2 wr where c is the specific heat (J/kg · Κ ) of the material to be rolled 1, p is the density (kg/m3) of the material to be rolled 1, and 7 is the processing heat efficiency. G is the rolling torque (N. m) is the work roll diameter (m), w is the plate width (m) of the material to be rolled, and h2 is the plate thickness (m) after the final pedestal 1 1 g. The amount of temperature drop ΔT2 caused by contact with the work rolls 1 1 gw and 1 1 gw was calculated by the following formula (2). -29- 201236776 [Math 2] Here, C is the specific heat of the material to be rolled 1 (J/kg. K ) , /〇 is the density (kg/m3 ) of the material to be rolled 1, and λ is the thermal conductivity of the material to be rolled 1
(W/m _ Κ ) 。h2是最終台座1 1 g後的板厚度（m ) ，tR 是被軋製材1與最終台座llg的工作輥llgw、llgw接觸 的時間（s ) ，TS2是朝工作輥1 1 gw、1 1 gw接觸中的被軋 製材1的表面溫度（°C )，以及Tr是工作輕llgw、llgw 的溫度。 從被軋製材溫度測定手段40起到工作輥1 1 gw、1 ! gw 爲止的搬運的氣冷、水冷導致的冷卻溫度下降量，能夠以 式子（3)、式子（4)求出。式子（3)是氣冷導致的溫 度降低Z T3A，式子（4 )是水冷導致的溫度降低z T31j。 [數學式子3] JT3A 2 σε Ts3a+273 4 ΓΤα+273] 4 cph-, 100 , 、 〆 100(W/m _ Κ ). H2 is the plate thickness (m) after the final pedestal 1 1 g, tR is the time (s) at which the rolled material 1 is in contact with the work rolls llgw, llgw of the final pedestal 11g, and TS2 is 1 gw, 1 1 gw toward the work roll 1 The surface temperature (° C.) of the material to be rolled 1 in contact, and Tr are temperatures at which the operation is light llgw and llgw. The amount of cooling temperature drop due to air-cooling or water-cooling of the conveyed material temperature measuring means 40 to the work rolls 1 1 gw and 1 ! gw can be obtained by the equations (3) and (4). Equation (3) is a temperature decrease due to air cooling, Z T3A, and equation (4) is a temperature decrease due to water cooling, z T31j. [Math 3] JT3A 2 σε Ts3a+273 4 ΓΤα+273] 4 cph-, 100 , , 〆 100
t3A+哉(UK ⑶ [數學式子4] AT3L-哉(TS3L-TL)t3L ⑷ 這裡的σ是斯特凡·波爾茲曼常數（w/m2 . K4 )， ε是被軋製材1的輻射率（一）’ c是被軋製材1的比熱 -30- 201236776 (J/k g K ) ’ P爲被車L製材1的密度（kg/m3) ^ 是 氣冷部的熱傳導率（W/m2 · K ) ，a R是水冷導致的熱傳 導率（W/m2· °C) ，h2是最終台座llg後的板厚（m)。 TS3L是水冷部分的被軋製材1的表面溫度（t ) ，TS3A是 氣冷部分的被軋製材1的表面溫度（°C ) ，TA爲氣溫（ °c ) ，TL爲冷卻水溫度（°c ) 。t3L是通過水冷部分的時 間（秒），t3A是通過氣冷部分的時間（秒）。這裡水冷 部分的被軋製材1的表面溫度代表該水冷部分的平均溫度 〇 目標溫度運算裝置5 1，將以該方式運算的入口側目 標表面溫度（熱軋精加工機列1 1的最終台座1 1 g入口側 的目標溫度），發送到設備控制裝置52。 本發明的最終'台座1 1 g入口側的目標溫度，理想是在 軋製之前，每次自動根據各種輸入條件來計算。可是，以 減輕計算機的負荷爲目的，以圖表準備預先在離線所求出 的目標溫度，在軋製前從該圖表參考類似條件的値的方法 也可以。當然當離線求出目標溫度時，是要考慮：最終台 座的軋製導致的加工發熱、搬運導致的氣冷、與工作輥 1 lgw、1 lgw的接觸導致的溫度降低的影響。 接著，設備控制裝置52，將所接收的入口側目標表 面溫度、與所接收的來自被軋製材溫度測定手段40的入 口側測定表面溫度，進行對比。在該對比，當入口側目標 表面溫度、與入口側測定表面溫度一致時，則維持該狀態 不發出任何指令。另一方面，如果不一致，則對線圈盒 -31 - 201236776 1 5、粗棒加熱器1 6、除鱗機1 7、及台座間冷卻裝置3 5之 中的至少一個發出指令，指示條件變更’以讓被軋製材溫 度測定手段40所測得的入口側測定表面溫度與入口側目 標表面溫度一致。也就是說’當被軋製材溫度測定手段 40所測得的入口側測定表面溫度’低於入口側目標表面 溫度時，則發出抑制冷卻的內容的指令’當高於入口側目 標表面溫度時，則發出加強冷卻的內容的指令。 具體來說，朝線圈盒1 5的指令例如爲保持時間的變 更，朝粗棒加熱器1 6的指令例如爲加熱溫度的變更，朝 除麟機1 7的指令例如爲噴射的水量或噴射時間的變更。 在軋製中不變更下壓率而固定地軋製的「非板厚變更 j時，在熱軋精加工機列1 1的各台座1 1 a、…1 1 f、1 1 g 的板厚度與摩擦係數（軋製潤滑油造成的影H )，是假設 在被軋製材的長軸方向固定來計算溫度。 另一方面，在軋製中將下壓率變更的「板厚變更」時 ，則必須在線圈長軸方向將熱軋精加工機列1 1的各台座 1 1 a、…1 1 f、1 1 g的板厚度與摩擦係數變更。於是，當計 算出入口側目標表面溫度時，也考慮所指定的板厚度、軋 製潤滑油（摩擦係數）的線圈長軸方向的資訊。 具體該板厚變更能以下述方式進行。也就是說，板淳 變更用的熱軋精加工機列的動作控制，具有出口側板厚度 決定步驟（在以下稱爲「步驟S1」），該步驟S1，包含 有：第一出口側板厚度決定步驟（以下稱爲「步驟S丨i」 )與第二出口側板厚度決定步驟（在以下稱爲「步驟S12 -32- ⑤‘ 201236776 」）。也就是說，在該動作控制，使用具有步驟S11及步 驟S 1 2的步驟s 1，來控制熱軋精加工機列的動作。 <出口側板厚度決定步驟S 1 > 步驟s 1，是分別將從第一台座起到第N台座爲止（N 爲2以上的整數）的各台座的出口側板厚度予以決定的步 驟。也就是說，N = 7及m = 3時（m爲1以上而N以下的 整數）’步驟S1，是分別將從第一台座lla起到第7台 座1 1 g爲止的7個台座的出口側板厚度予以決定的步驟。 在本型態的動作控制方法，步驟S1，只要具有後述的步 驟S 1 1及步驟S 1 2的話，其型態並沒有特別限定。 <第一出口側板厚度決定步驟S 1 1 > 步驟S11’是用來決定：從當將被軋製材丨的穩定部 軋製時的第一台座到第N台座的出口側板厚度的步驟。 也就是說，當N = 7時，步驟S11，是用來決定：從當將被 軋製材1的穩定部軋製時的第一台座1 1 a到第7台座1 1 g 的出口側板厚度Η 1〜H7的步驟。在該動作控制，所謂被 軋製材1的穩定部’爲使用軋製潤滑劑軋製的被軋製材！ 的部分’爲用來得到原本的製品的規格（板厚度 '粒徑） 的軋製條件所軋製的部分。 <第二出口側板厚度決定步驟S12> 步驟S12，是用來決定從第1台座到第n台座的出口 -33- 201236776 側板厚度的步驟，讓當將被軋製材i的前端軋製部軋製時 的第N-m+ 1台座到第N台座的各後段台座的出口側板厚 度’較當將被乳製材1的穩定部軋製時的相同台座的出口 側板厚度更厚。也就是說’ N = 7且m = 3時，步驟S 1 2，當 以步驟S12決定的從第5台座ne到第7台座iig的各後 段台座的出口側板厚度分別爲Η 5 ’ 、Η 6， 、Η 7，時，則 Η5’ >Η5，Η6’ >Η6且Η7’ >Η7’以該方式來決定從第1 台座11a到第7台座llg的各台座的出口側板厚度hi， 〜Η 7 ’的步驟。在本型態的動作控制方法，所謂被軋製 材1的前端軋製部’是不使用軋製潤滑劑所軋製的被軋製 材1的前端側部分》 這裡將被軋製材1進行軋製的熱軋精加工機列1 1 ( 全部7台座）的動作’如下述《首先，以讓從第1台座 1 1 a到第7台座1 1 g的出口側板厚度，成爲在步驟s ! 2所 決定的前端軋製部的出口側板厚度H1’〜H7’的方式， 開始進行軋製。此時並不供給軋製潤滑劑。在咬入最前端 部之後的預定時機，在從第5台座lie到第7台座llg開 始進行軋製潤滑劑的供給，並且以讓從第1台座1 1 e到第 7台座llg的出口側板厚度成爲在步驟S11所決定的稔定 部的出口側板厚度Η 1〜H7的方式，使軋製機作動，而移 往進行穏定部的軋製。 將以該方式進行的熱軋精加工機列1 1的各台座1 1 a .....1 1 f、Π g的板厚度與摩擦係數’在線圏長軸方向 的變更，依序適用於目標溫度運算，計算出目標溫度。 -34- 201236776 藉由使用製造裝置10的如以上的熱軋鋼板的製造方 法，則能設定：熱軋精加工機列11的最終台座1 1 gw入 口側溫度的目標溫度。藉由與實際溫度對比，將指令發出 到設備，則可進行被軋製材1的溫度管理。 第7圖是用來說明第二實施方式的熱軋鋼板的製造裝 置110(以下記載爲「製造裝置110」）的槪念圖。在製 造裝置110,相對於製造裝置10,不同之處在於具備有： 軋製後被軋製材溫度測定手段1 40、修正裝置i 50。其他 部分與製造裝置10相同，所以在第7圖圖號相同，且省 略說明。 軋製後被軋製材溫度測定手段1 40，是能在第7圖朝 箭頭VII所示的方向移動的測溫手段。該軋製後被軋製材 溫度測定手段1 4 0，當不使用立刻急速冷卻裝置2 0進行 軋製時’移動接近被軋製材1，測定被軋製材溫度，當使 用立刻急速冷卻裝置20時則退避。藉此，當使用立刻急 速冷卻裝置2 0時，、與不使用時，分別使用，則能利用 所軋製的被軋製材1進行適當的溫度管理。 修正裝置1 50，是在不使用立刻急速冷卻裝置20，而 使用軋製後被軋製材溫度測定手段1 40時，取得來自被軋 製材溫度測定手段40及軋製後被軋製材溫度測定手段 1 40的溫度資訊，進行運算，將結果發送到目標溫度運算 裝置51的裝置。 在修正裝置1 50，考慮到：被軋製材溫度測定手段40 及軋製後被軋製材溫度測定手段1 40的差異、以及兩感應 -35- 201236776 器間的放熱導致的溫度降低，而得到最終台座1 1 g的出口 側溫度作爲預測値。 另一方面，從目標溫度運算裝置51’將藉由該裝置 5 1所進行在目標表面溫度的運算過程所得到的最終台座 1 1 g的出口側的運算溫度，發送到修正裝置1 50。 修正裝置1 50，將該預測値與運算溫度進行比較，修 正運算的誤差而將其發送到目標溫度運算裝置51。目標 溫度運算裝置51，藉由該修正過的運算式，計算熱軋精 加工機列1 1的最終台座1 1 g的入口側目標溫度（入口側 目標表面溫度），將其發送到設備控制裝置52。 藉此，則可使熱軋精加工機列1 1的最終台座1 1 g的 入口側目標溫度（入口側目標表面溫度）的運算精確度提 升。 以上是關於現在所執行且較佳的實施方式，來說明本 發明，而本發明並不限定於本案說明書中所揭示的實施方 式，在沒有違背申請專利範圍及說明書全體所讀取的發明 主旨或思想的範圍，可適當變更，伴隨該變更的熱軋鋼板 的製造方法及熱軋鋼板的製造裝置，也必須理解爲包含於 本發明的技術範圍。 【圖式簡單說明】 第1圖是示意性地顯示第一實施方式的熱軋鋼板的製 造裝置的一部分的圖面。 第2圖是關注第1圖之中，最終台座與其之前的台座 -36- ⑤ 201236776 之間、以及配置有立刻急速冷卻裝置的部分加以放大的圖 面。 第3圖是關注立刻急速冷卻裝置之中配置在最終台座 內的部分的圖面。 第4圖是用來說明立刻急速冷卻裝置的冷卻噴嘴的立 體圖。 第5圖是用來說明立刻急速冷卻裝置的冷卻噴嘴的排 列的圖面。 第6圖是最終台座與其之前的台座之間的其他例子的 說明圖。 第7圖是示意性地顯示第二實施方式的熱軋鋼板的製 造裝置的一部分的圖面。 【主要元件符號說明】 1 :被軋製材 1 0 :熱軋鋼板的製造裝置 1 1 :熱軋精加工機列 1 2 :搬運輥 1 3 :夾送車昆 1 4 :捲繞裝置 1 5 :線圈盒 1 6 :粗棒加熱器 17 :除鱗機 2 0 :立刻急速冷卻裝置 -37- 201236776 2 1 :上面供水手段 22 :下面供水手段 25 :上面導件 3 0 :下面導件 3 5 :台座間冷卻裝置 3 6 :台座間上面供水手段 3 7 :台座間下面供水手段 3 8 =台座間下面導件 40 :被軋製材溫度測定手段 5 0 :溫度控制手段 5 1 :目標溫度運算裝置 52 :設備控制裝置 1 1 〇 :熱軋鋼板的製造裝置 1 40 :軋製後被軋製材溫度測定手段 -38- ⑤.t3A+哉(UK (3) [Math 4] AT3L-哉(TS3L-TL)t3L (4) where σ is the Stefan Boltzmann constant (w/m2 . K4 ), ε is the radiation of the material to be rolled 1 Rate (1) 'c is the specific heat of the rolled material 1-30-201236776 (J/kg K ) ' P is the density of the material 1 of the vehicle L (kg/m3) ^ is the thermal conductivity of the air-cooled part (W/m2) · K), a R is the thermal conductivity (W/m2·°C) caused by water cooling, and h2 is the thickness (m) of the final pedestal llg. TS3L is the surface temperature (t) of the material 1 to be rolled in the water-cooled part, TS3A is the surface temperature (°C) of the material to be rolled 1 in the air-cooled portion, TA is the temperature (°c), TL is the cooling water temperature (°c), t3L is the time (seconds) through the water-cooled portion, t3A is passed The time (seconds) of the air-cooled portion. Here, the surface temperature of the material to be rolled 1 in the water-cooled portion represents the average temperature of the water-cooled portion 〇 the target temperature computing device 51, and the inlet-side target surface temperature to be calculated in this manner (hot-rolled fine The target pedestal of the final pedestal 1 1 g of the processing machine train 1 1 is sent to the device control device 52. The final ' pedestal of the present invention 1 1 g on the inlet side of the target The degree is ideally calculated automatically according to various input conditions before rolling. However, for the purpose of reducing the load on the computer, the target temperature previously obtained offline is prepared by the chart, and the chart is referenced before rolling. The method of enthalpy of similar conditions is also possible. Of course, when the target temperature is obtained offline, it is considered: the heat generated by the rolling of the final pedestal, the air cooling caused by the transportation, and the contact with the work rolls 1 lgw, 1 lgw The influence of the temperature decrease. Next, the equipment control device 52 compares the received inlet-side target surface temperature with the received inlet side measurement surface temperature from the material to be rolled material 40. In this comparison, when the entrance When the side target surface temperature coincides with the inlet side measured surface temperature, no command is issued to maintain the state. On the other hand, if it is inconsistent, the coil case -31 - 201236776 1 5, the thick rod heater 16 , descaling At least one of the machine 1 7 and the inter-station cooling device 35 issues a command to indicate a condition change 'to allow the rolled material temperature measuring means 40 The measured inlet side measurement surface temperature coincides with the inlet side target surface temperature, that is, when the inlet side measurement surface temperature measured by the rolled material temperature measuring means 40 is lower than the inlet side target surface temperature, the suppression is performed. The command of the cooled content 'when it is higher than the inlet-side target surface temperature, an instruction to enhance the content of the cooling is issued. Specifically, the command toward the coil case 15 is, for example, a change in the holding time, toward the thick rod heater 16 The command is, for example, a change in the heating temperature, and the command to the de-mining machine 17 is, for example, a change in the amount of water to be injected or the injection time. The plate thickness of each of the pedestals 1 1 a, ... 1 1 f, 1 1 g in the hot rolling finishing machine row 1 1 when the non-plate thickness change j is fixedly rolled without changing the pressing ratio during rolling. The coefficient of friction (the shadow H by the rolling lubricant) is assumed to be fixed in the direction of the long axis of the material to be rolled, and the temperature is changed. It is necessary to change the plate thickness and the friction coefficient of each of the pedestals 1 1 a, ... 1 1 f, and 1 1 g of the hot-rolling finishing machine array 1 in the longitudinal direction of the coil. Then, when calculating the inlet-side target surface temperature, information on the specified plate thickness and the direction of the long axis of the coil of the lubricating oil (friction coefficient) is also considered. Specifically, the plate thickness change can be performed in the following manner. In other words, the operation control of the hot rolling finishing machine row for changing the sheet has an outlet side plate thickness determining step (hereinafter referred to as "step S1"), and the step S1 includes a first outlet side plate thickness determining step. (hereinafter referred to as "step S丨i") and the second outlet side panel thickness determining step (hereinafter referred to as "step S12 - 32-5 '201236776"). That is, in this operation control, the operation of the hot rolling finishing machine train is controlled using step s1 having step S11 and step S12. <Exit Side Plate Thickness Determination Step S1 > Step s1 is a step of determining the thickness of the outlet side plate of each pedestal from the first pedestal to the Nth pedestal (N is an integer of 2 or more). In other words, when N = 7 and m = 3 (m is an integer of 1 or more and N or less), step S1 is an exit of seven pedestals from the first pedestal 11a to the seventh pedestal 1 1 g. The step of determining the thickness of the side panels. In the operation control method of the present embodiment, the step S1 is not particularly limited as long as it has the steps S 1 1 and S 1 2 described later. <First outlet side panel thickness determining step S 1 1 > Step S11' is a step of determining the thickness of the outlet side panel from the first pedestal to the Nth pedestal when the stabilizing portion of the material to be rolled is rolled. That is, when N = 7, step S11 is for determining the thickness of the exit side plate from the first pedestal 1 1 a to the seventh pedestal 1 1 g when the stabilizing portion of the material 1 to be rolled is rolled. 1 to H7 steps. In this operation control, the stabilizing portion of the material to be rolled 1 is a rolled material that is rolled using a rolling lubricant! The portion 'is the portion to be rolled by the rolling conditions for obtaining the specifications (plate thickness 'particle diameter) of the original product. <Second outlet side plate thickness determining step S12> Step S12 is a step for determining the thickness of the side plate from the first pedestal to the nth pedestal -33 - 201236776, so that the rolling end portion of the material to be rolled i is rolled The thickness of the outlet side plate of the respective pedestals of the N-m+1 1st to the Nth pedestals at the time of manufacture is thicker than the thickness of the exit side plates of the same pedestal when the stable portion of the dairy material 1 is rolled. That is, when 'N=7 and m=3, step S12, the thickness of the exit side plates of each of the rear stage pedestals from the fifth pedestal ne to the seventh pedestal iig determined in step S12 are Η 5 ', Η 6 respectively. , Η, 时, then Η5' > Η5, Η6' > Η6 and Η7' > Η7' determine the thickness of the exit side plate hi of each pedestal from the first pedestal 11a to the seventh pedestal 11g in this manner, ~Η 7' steps. In the operation control method of the present type, the front end rolling section ' of the material to be rolled 1 is the front end side portion of the material 1 to be rolled which is rolled without using a rolling lubricant. Here, the rolled material 1 is rolled. The operation of the hot-rolling finishing machine 1 1 (all 7 pedestals) is as follows: First, the thickness of the outlet side plate from the first pedestal 1 1 a to the seventh pedestal 1 1 g is determined in step s ! 2 The thickness of the exit side plate thickness H1' to H7' of the leading end rolling section is started to be rolled. The rolling lubricant is not supplied at this time. At a predetermined timing after biting into the foremost end portion, the supply of the rolling lubricant is started from the fifth pedestal lie to the seventh pedestal 11g, and the thickness of the outlet side plate from the first pedestal 1 1 e to the seventh pedestal 11g is made. In the manner in which the outlet side plate thicknesses Η 1 to H7 of the setting portion determined in the step S11 are performed, the rolling mill is moved and moved to the rolling portion for performing the setting. The change of the plate thickness and the friction coefficient of the pedestal 1 1 a .....1 1 f, Π g in the hot rolling finishing machine row 1 in this manner is sequentially applied to The target temperature is calculated to calculate the target temperature. -34- 201236776 By using the above-described method for producing a hot-rolled steel sheet using the manufacturing apparatus 10, it is possible to set a target temperature of the inlet side temperature of the final pedestal of the hot-rolling finishing machine array 11 at 1 gw. The temperature management of the material to be rolled 1 can be carried out by issuing an instruction to the equipment in comparison with the actual temperature. Fig. 7 is a view for explaining a manufacturing apparatus 110 (hereinafter referred to as "manufacturing apparatus 110") of the hot-rolled steel sheet according to the second embodiment. The manufacturing apparatus 110 differs from the manufacturing apparatus 10 in that it is provided with a rolled material temperature measuring means 140 and a correction means i 50 after rolling. The other parts are the same as those of the manufacturing apparatus 10, so the figure is the same in Fig. 7, and the description is omitted. The rolled material temperature measuring means 140 after rolling is a temperature measuring means which is movable in the direction indicated by the arrow VII in Fig. 7. After the rolling, the rolled material temperature measuring means 1404 moves to the material to be rolled 1 when the rolling is performed without using the rapid cooling device 20, and the temperature of the material to be rolled is measured. When the rapid cooling device 20 is used immediately, Retreat. Thereby, when the immediate rapid cooling device 20 is used and used when not in use, the rolled material 1 to be rolled can be appropriately temperature-controlled. In the correction device 150, when the rolled material temperature measuring means 134 is used without using the immediate rapid cooling device 20, the rolling material temperature measuring means 40 and the rolled material temperature measuring means 1 after rolling are obtained. The temperature information of 40 is calculated, and the result is sent to the device of the target temperature computing device 51. In the correction device 150, the difference between the material to be rolled material 40 and the material to be measured by the rolled material temperature after rolling and the temperature drop caused by the heat release between the two inductions - 35 - 201236776 are considered. The outlet side temperature of the pedestal 1 1 g is used as a prediction 値. On the other hand, the target temperature calculation means 51' transmits the calculation temperature of the exit side of the final pedestal 1 1 g obtained by the calculation of the target surface temperature by the apparatus 51 to the correction means 150. The correcting means 150 compares the predicted chirp with the calculated temperature, corrects the calculated error, and transmits it to the target temperature calculating means 51. The target temperature computing device 51 calculates the inlet-side target temperature (inlet-side target surface temperature) of the final pedestal 1 1 g of the hot-rolling finishing machine row 1 by the corrected arithmetic expression, and transmits it to the device control device. 52. Thereby, the calculation accuracy of the inlet-side target temperature (inlet-side target surface temperature) of the final pedestal 1 1 g of the hot-rolling finishing machine row 1 can be improved. The present invention is described with respect to the presently-executed and preferred embodiments, and the present invention is not limited to the embodiments disclosed in the specification, and is not inconsistent with the scope of the invention and The range of thoughts can be appropriately changed, and the method for producing a hot-rolled steel sheet and the apparatus for manufacturing a hot-rolled steel sheet according to the above modifications must also be understood as being included in the technical scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view schematically showing a part of a manufacturing apparatus of a hot-rolled steel sheet according to a first embodiment. Fig. 2 is an enlarged view of the portion between the final pedestal and its previous pedestal -36- 5 201236776 and the immediate rapid cooling device. Fig. 3 is a view focusing on a portion of the immediate rapid cooling device disposed in the final pedestal. Fig. 4 is a perspective view for explaining a cooling nozzle of an immediate rapid cooling device. Fig. 5 is a view for explaining the arrangement of cooling nozzles of the immediate rapid cooling device. Figure 6 is an illustration of other examples between the final pedestal and its previous pedestal. Fig. 7 is a view schematically showing a part of a manufacturing apparatus of a hot-rolled steel sheet according to a second embodiment. [Explanation of main component symbols] 1 : Rolled material 10 : Manufacturing equipment for hot-rolled steel sheet 1 1 : Hot-rolling finishing machine train 1 2 : Transport roller 1 3 : Clamping truck 1 4 : Winding device 1 5 : Coil case 1 6 : Thick rod heater 17 : Descaler 2 0 : Immediate rapid cooling device -37- 201236776 2 1 : Upper water supply means 22 : Lower water supply means 25 : Upper guide 3 0 : Lower guide 3 5 : Inter-station cooling device 3 6 : Water supply means between the pedestals 3 7 : Water supply means between the pedestals 3 8 = Between the pedestal lower guides 40 : Rolled material temperature measuring means 5 0 : Temperature control means 5 1 : Target temperature computing means 52 : Equipment control device 1 1 〇: Manufacturing equipment for hot-rolled steel sheet 1 40 : Measuring method for the temperature of the rolled material after rolling - 38 - 5.