4253 1 6 A7 經濟部智慈財產局貝工消费合作社印製 _m____五、發明說明4 ) 〔發明之詳細說明〕 、 〔技術領域〕 本發明係關於一種能夠圓滑地製造厚度均与之薄板（ 鋼板）之薄板熱軋機者。 〔背景技術〕 用熱輾軋來製造薄板時，除了需要把板之厚度爲均勻 之外，將板之後端部圖滑地通過各辗壓機係重要的問題。 用軋輥輾壓鋼板時，在板之寬度方向會發生中央附近變厚 之隆起部（本體隆起部）及在板之兩端部（突緣部分）厚 度急激減少之板邊變薄等而易使厚度不均勻之外，當板厚 爲特別薄時，容易發生板之後端部彎曲之狀態下通過輾壓 機之叫做「壓折」（pincher )之問題的關係。上述之隆起 係根據輥子之彎曲變形而振幅之中央附近變厚的現象，而 板邊變薄係輥子之夾緊板的部分（壓接板的部分）與不夾 緊的部分（板寬度之外側部分）.之境界中，在輥子周面形 成弧狀之高低差部之結果，在板之兩端部之壁厚爲向外側 弧狀減少而構成傾斜角度之現象。又，所謂壓折係在辗壓 机間未給予張力之關係而變成不穩定之板之後端部碰撞ϋ 方之導板等而折彎，以彎曲之狀態進入輾壓機之輥子間之 現象。產生隆起及板邊變薄時會降低有關板厚之尺寸精度 ;產生壓折時會傷及輥子的關係需要再磨光該輥子等之問 題發生，顯著地延誤生產。 -----------!裝 « tf 1 Ka_v .1« · ft— «ϋ I I K n I 線 («t先《讀铲面之il意事項再，i本頁) 本紙張尺度適用中0國家標準（CNS>A4規格（210 X 297公釐〉 _ 4 - 425316 ^ __ _ B7 經濟部智慧財產局員工湞费合作社印» 五、發明說明p ) 在板後端部之屋折爲板厚愈薄愈容易產生。其理由爲 ，要使板厚變薄時壓下量變多的關係，辗懕負荷變大》向 橫方向移動板之力量也相對地變大；又，當板碰到設在辗 •壓機前方之導板等時，其端部容易折彎的關係者。因此， 在熱軋機中現實可輾壓之鋼板之厚度係被認爲以1 . 2 m m爲下限。 防止壓折之同時要圓滑地熱軋厚度1 . 2 mm左右以 下之鋼板之技術爲，有記載於日本鋼鐵協會演講會原稿集 (CAMP-ISIJ VOL. 10 (1997)-1 088)中之「（280)千葉3HOT中之無端辗壓 之全體槪要」，及日本專利申請案特開平6 — 10620 7號公報等中有記載。該等刊物記載之技術係在精軋機之 前面在板之後端部接合下一個板之前端部之結果，減少受 不到張力之後端部之部位數量者。又，該時關於無法避免 作爲後端部之部分|即輾壓成其厚度在1 . 6mm以上來 防止壓折之發生。 按照上述刊物記載之技術來.欲圓滑地製造薄板時，相 較於以往之熱軋機，必要之設備成本會相當地上昇。其原 因爲，需要可在短時間內把板光滑地接合之特殊告接合裝 置，或要追加切斷裝置等之外，還要變更熱軋機之生產線 全體之配置。因此，使用既設之熱軋機時，若欲實現上述 之技術必需要大幅度之改造，改造工程之期間爲長期化而 勢必長期停止作業》又，只靠上述之裝置，雖然可以防止 壓折之發生，但難以抑制板會產生隆起及板邊變薄之現象 — — — — — — — — — — — — — — ·1111111 ^ in— — — I (»-先《讀t-«之注f項再rv本實) 本紙張尺度適用中國圏家標準（CNS)A4規格（210 *297公釐） -5- 4253 16 A7 B7 五、發明說明Ο ) 經濟部智慧財產局貝工消费合作社印製 本發明之目的在於提供一種在生產厚度在1 . 2mm 左右以下之薄板時*也可抑制隆起及板邊變薄之發生之同 時，可防止後端部發生壓折，且容易構成之熱軋機者。 〔發明之揭示〕 本發明之薄板之熱軋機係具備有由前段及後段所構成 之精軋機， (1 )前段係以2部滾軋機以上之C V C滾軋機或成 對交叉滾壓機所構成， (2 )後段係以2部滾軋機以上之異徑輥子滾軋機所 構成爲其特徵。 上述（1 )所謂之C V C滾軋機係指其外徑向軸方向 連續變化之輥子，係包含可向軸長方向移動者（CVC輥 子）之周知之滾軋機而言。又，所謂成對交叉滾軋機係指 將一對工作輥與支承輥同時配置成不平行而在中央附近最 接近之交叉狀使相互之位置關係（角度等）爲變更自如之 周知之滾軋機而言。該等滾軋機係均具有變更輥子間隙形 狀之變更能力者。換言之，CVC滾軋機爲把具有上述可 變化外徑之C V C輥子向軸長方向移動，而成對交叉滾軋 機爲如上述變更配置成交叉狀之輥子之位置關係*分別可 變更輥子間隙形狀。而且，上述之滾軋機爲相較於僅能實 行軋輥撓曲等之裝置，其變更輥子間隙形狀之能力較大。 另一方面，上述（2 )所謂之異徑輥滾軋機係指一對 η4253 1 6 A7 Printed by the Shellfish Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs _m____ V. Description of Invention 4) [Detailed Description of Invention], [Technical Field] The present invention relates to a thin plate that can be smoothly manufactured with the same thickness. (Steel plate) for hot rolling mills. [Background Art] When manufacturing a thin plate by hot rolling, in addition to making the thickness of the plate uniform, it is an important problem to smoothly pass the rear end of the plate through each rolling machine. When the steel plate is rolled with a roller, a raised portion (body raised portion) that becomes thick near the center occurs in the width direction of the plate, and the edge of the plate that is sharply reduced in thickness at both end portions (flange portions) of the plate tends to be thin. In addition to uneven thickness, when the plate thickness is extremely thin, a problem called "pincher" that passes through a rolling machine in a state where the end portion of the plate is bent after the plate is liable to occur. The above-mentioned bulge is a phenomenon in which the vicinity of the center of the amplitude becomes thicker according to the bending deformation of the roller, and the thinning of the edge of the plate is caused by the portion of the clamping plate (the portion of the crimping plate) and the portion not clamped (outside of the width of the plate) Part). In the realm, as a result of the arc-shaped height difference formed on the peripheral surface of the roller, the wall thickness at the two end portions of the plate decreases to the outside to form an inclined angle. In addition, the so-called crimping is a phenomenon in which the ends of the rolling machines become unstable plates without giving tension to the rolling machines, and then the ends collide with the rectangular guides, etc., and bend, and enter into the rollers of the rolling machines in a bent state. The occurrence of bulges and thinning of the edge of the board will reduce the dimensional accuracy of the thickness of the board; the relationship between the rollers will be damaged when creasing occurs, and the problem of re-polishing the rollers will occur, which will significantly delay production. -----------! Loading «tf 1 Ka_v .1« · ft — «ϋ IIK n I line (« t first read the meaning of the shovel surface, then this page) This paper size Applicable National Standard 0 (CNS > A4 (210 X 297 mm) _ 4-425316 ^ __ _ B7 Printed by the Intellectual Property Office of the Ministry of Economic Affairs and Staff Cooperative Cooperatives »V. Description of the invention p) House fold at the back of the board The reason is that the thinner the plate, the easier it is to produce. The reason is that in order to make the plate thickness thinner, the rolling load becomes larger. The force of moving the plate in the horizontal direction is relatively large; When it comes to a guide plate located in front of the rolling press, etc., the end is easy to bend. Therefore, the thickness of a steel plate that can be rolled in a hot rolling mill is considered to be 1.2 mm. The lower limit. The technology of hot rolling steel sheets with a thickness of about 1.2 mm or less while preventing creasing is described in the original collection of lectures of the Japan Iron and Steel Association (CAMP-ISIJ VOL. 10 (1997) -1 088). It is described in "(280) Unexplained Rolling Out of Chiba 3HOT" and in Japanese Patent Application Laid-Open No. 6-10620 7 and the like. The technology is the result that the front end of the finishing mill is joined to the end of the next plate before the end of the next plate, reducing the number of parts that cannot be subjected to tension after the end. Also, at this time, the part that cannot be avoided as the back end | Rolled to a thickness of 1.6 mm or more to prevent creasing. According to the technology described in the above-mentioned publications, when manufacturing thin sheets smoothly, the necessary equipment costs will increase considerably compared with conventional hot rolling mills. The reason for this is that a special joining device capable of smoothly joining the plates in a short time is required, or in addition to a cutting device, etc., the configuration of the entire production line of the hot rolling mill must be changed. Therefore, the existing hot rolling is used. In order to realize the above-mentioned technology, it is necessary to make a large-scale transformation. During the transformation project, it is necessary to stop the operation for a long period of time. Again, although the above-mentioned devices can prevent the occurrence of buckling, it is difficult to suppress the board meeting. The phenomenon of bulging and thinning of the board edge occurs — — — — — — — — — — — — — — — 1111111 ^ in — — — I (»-“ Read the f-note of t- «, then rv) The Zhang scale is applicable to the Chinese Family Standard (CNS) A4 specification (210 * 297 mm) -5- 4253 16 A7 B7 V. Description of the invention 0) Printed by the Shelley Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs The purpose of the present invention is to provide a When producing a sheet with a thickness of about 1.2 mm or less *, it can also suppress the occurrence of bulging and thinning of the sheet edge, and can prevent the rear end from being crimped, and it is easy to construct a hot rolling mill. [Disclosure of the invention] The hot rolling mill for thin sheets of the present invention is equipped with a finishing mill composed of a front stage and a rear stage. (1) The front stage is constituted by a CVC rolling mill or a pair of cross rolling mills with two or more rolling mills. (2) The rear section is characterized by two rollers with different diameters or more. The above-mentioned (1) C V C rolling mill refers to a roll whose continuous radial direction changes continuously, and is a well-known rolling mill which includes a person capable of moving in the axial direction (CVC roll). The paired cross rolling mill refers to a well-known rolling mill in which a pair of work rolls and back-up rolls are arranged simultaneously in a non-parallel manner and are closest to each other in a cross shape near the center so that the mutual positional relationship (angle, etc.) can be changed freely. Speak. These rolling mills are capable of changing the shape of the roll gap. In other words, the CVC rolling mill moves the C V C roll having the above-mentioned variable outer diameter toward the axial length, and the pair of cross rolling mills changes the positional relationship of the rolls arranged in a cross shape as described above. * The roll gap shape can be changed respectively. In addition, the above-mentioned rolling mill has a greater ability to change the shape of the roll gap than an apparatus that can only perform roll deflection and the like. On the other hand, the so-called different-roller rolling mill in (2) above refers to a pair of η
面 之 注 意 I 戶'W裝 本’ I 訂 線 本紙張尺度適用中國®家標準（CNS>A4規格（210 X 297公釐） -6- 253 1 6 A7 B7 五、發明說明·) 之工作輥之直徑不同，且只旋轉驅動大徑之工作輥之滾軋 機而言。異徑輥滾軋機爲首先一方之工作輥爲小徑的關係 在較小的壓下力也容易加大壓下量，又只驅動大徑之工作 ‘輥而對滾軋材料作用剪斷力的關係*與工作輥之直徑均爲 大（同一直徑者）之一般滾軋機相較，可容易加大壓下率 。因此，異徑輥滾軋機爲，相較於設置在一般之滾軋機及 前段部分之上述（1 )之滾軋機比較，降低其滾軋壓力時 也可實現與該等各滾軋機同等之壓下率。因此，滾軋機數 少之小型配置時也能夠可發揮前述之作用，且可實現充分 之壓下率者。又，異徑輥滾軋機爲，工作輥之直徑均大之 一般性滾軋機實行輕微的改造（挽言之，將一方之輥子變 更成小徑之輥子等）也可以構成的關係，有可利用之既設 之滾軋機時，可以簡單且以低成本構成本發明之熱軋機者 as 讀 背 面 之 注 項Ϊ 買 裝 訂 經濟部智慧財產局貝工消费合作社印製 根據具有上述（1)及（2)之配置之本發明之熱軋 機，可抑制薄板發生隆起及板邊變薄之同時可減少在後端 部發生壓折之頻度。此乃根據下述a )〜c )之作用。 a )在精軋機之中於前段之（1 )之部分控制輥子間 隙形狀之變更之結果，可抑制板所發生之隆起。板之隆起 係因滾軋機之輥子彎曲而振幅方向（換言之輥子之軸長方 向）之輥子間隙變成不均勻而發生，但以（1 )之滾軋機 來適當地變更控制時，可縮小板之隆起，或可製造具有绿 適當隆起之板。又，變更輥子間隙來控制隆起之方法係會 降低板之平坦度等，但因爲在精軋機之前段部分實行該控 線 本紙張尺度適用中®國家揉準（CNS)A4规格（210 * 297公釐） 4 2 5 3 16 A7 B7 經濟部智慧財產局員工消费合作社印製 五、發明說明$ ) 制的關係，可在中段或後段之部分來改善其平坦度等β又 ，在前段部分縮小隆起時，在後段之部分等實行維持其之 滾軋即可，可使後述之異徑輥子滾軋之作業爲穩定。 b)在精軋機中後段之（2)之部分實行滾軋壓力€ 之滾軋之結果，可使板之後段部不容易發生壓折。壓折係 未加張力之板之後端部向橫方（通過線之右方或左方）邏 動|碰到滾軋機之導板等而發生，但經調査之結果'，明白 了滾軋壓力低時後端部不容易向橫方擺動。其理由是，推 測爲滾軋之裝置無法製造成完全左右對稱的關係。換言之 ，根據滾軋機及滾軋輥子係嚴格而言，並不是完全左右對 稱的關係，認爲對板有向左右任何一方之非對稱力量作用 ，因此，滾軋壓力愈小，使板向左右之力量也變小，而後 端部不易擺動者。因此在該滾軋機中滾軋相當薄之板時也 不容易發生在其後端部產生壓折之問題》又•在精軋機中 板之後端部橫向擺動之量（振幅）係通常是愈在後段之滾 軋機愈擴大的關係，在該滾軋機中在後段部分實行滾軋壓 力低的滾軋即可有效地防止壓折.》 c )同樣在後段之（2 )之部分實行滾軋壓力低的滾 軋的關係可以抑制板邊變薄之發生。板邊變薄係在輥子壓 接於板之部分與板之寬度外側部分之境界，於輥子面形成 弧狀之高低差之原因而產生的關係，降低滾軋壓力，在壓 接於板之部分減少在輥子產生之凹陷之結果可縮小板邊變 薄的情形》 ' 再者，在本熱軋機中，配置2部滾軋機以上之上述（ 锖- 先 0Q 讀 背 面 之 注 項 再 r » 頁 訂 線 本紙張尺度適用中國國家標準（CNS>A4规格（210*297公釐） -8· A7 425316 ___B7_ 五、發明說明$ ) 1)之滾軋機（CVC滾軋機或成對交叉滾軋機）的關係 可有效地抑制板之隆起，加以（2 )之滾壓機（異徑輥滾 軋機）也設2部滾軋機以上的關係可顯著地降低滾軋壓力 '之結果，可有效地抑制壓折及板邊變薄之發生之同時可實 現所要之壓下率' 在本發明之熱軋機中•除了上述以外，於配置在上游 之粗滾軋機（之最終滾軋機）與上述之精軋機（之最前面 之滾軋機）之間，可配置防止板溫度降低之裝置。關於防 止溫度下降之裝置爲有隧道式烘爐及薄鋼片捲取·解捲裝 置，及薄鋼片加熱器等。 被送到精軋機以前之板係成爲以精軋機排出之一方之 速度而定之低速，因此滯留時間較長，愈到板之後方（後 端附近）溫度愈下降。然後，在精軋機中也是愈進到後段 之部分，該板之溫度愈下降。然而，在本熱軋機中，用上 述之防止板溫度下降之裝置來保持被送到精軋機前之板之 溫度，或上昇該溫度。如果板溫度充分地高時，精軋所需 要之滾軋壓力比板溫低時爲低。.因此，用上述手段來防止 板溫度下降之本熱軋機中，可用較低之滾乳壓力實行精軋 (尤其是在其後段之部分。又*可使板之先端部與後段部 之溫度爲相等的關係，無滾軋負荷之變動而可實行穩定之 滾軋。因此，可有效地抑制板邊變薄或屋折之發生。 1 〔圖式之簡單說明〕 第1 a圖係顯示本發明一實施形態之熱軋機之系統圖 本紙張尺度適用中S國家標準（CNS)A4規格（210 X 297公釐） 1 φ 1 i· if n I I <锖先《讀會面之注意事項再V人本頁) 經濟部智慧財產局貝工消費合作杜印製 -9 - Α7 4253 1 δ ____Β7 _ 五、發明說明f ) ο 第1 b圖係顯示第1 a圖中線b — b箭視圖，係模式 顯示C V C滾軋機之要部之正面圖。 第1c圖係顯示在第1b圖中工作輥向軸線方向變位 而輥子間隙改變之狀態之圖。 第I d圖係顯示第1 a圖中d部之詳細圖，係模式顯 示異徑輥子滾軋機之要部之側面圖。 第2 a圖係顯示有關本發明之其他實施形態之熱軋機 之系統圖。 第2 b圖係顯示有關本發明之再其他實施形態之熱軋 機之系統圖。 第2 c圖係顯示有關本發明其他實施形態之熱軋機之 系統圖。 第3圖係顯示成對交叉滾軋機之圖。 第4圖係顯示精軋機之入口之一方之板溫度之圖表。 主要元件對照表 1 加熱爐 10 粗滾軋機 3 0 精軋機 4 0 捲取機 3 1 前段 3 1 A 滾軋機 3 1 B 滾軋機 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） — mill — — — — H - I I I I I I I — — — — — (請先Μ讀t面之法$項再，、本買> 經濟部智慧財產局貝工消费合作社印製 -10- Λ253 ^ 6 at B7 經濟部智慧財產局員工消费合作社印製 五、發明說明$ ) 3 1 C 滾軋機 3 1 a 工作輥 31b 工作輥 • 31c 支承輥 31d 支承輥 3 2 後段 3 2 A 滾軋機 3 2 B 滾軋機 3 2 C 滾軋機 32a 工作輥 32b 工作輥 32c 支承輥 3 2 d 支承輥 21 隧道式烘爐 36 成對交叉滾軋機 36a 工作輥 3 6 b 工作輥 3 6 c 支承輥 3 6 d 支承輥 22 捲取·解捲裝置 23 薄鋼片加熱器。 〔實施發明之最佳形態〕 茲就本發明之一實施形態說明如下。第1 a圖係顯示 ------------裝 * n n ϋ n n ϋ I» ϋ I n I 線 (饞先M讀t面之注意事項再rh本頁) 本紙張尺度適用中國S家標準（CNS)A4規格（210 X 297公釐） -11 - 4253 丨 6 A7 經濟部智慧財產局貝X消费合作社印製 m_五、發明說明Φ ) 本發明一實施形態之熱軋機Α之全體，第1 b圖係模式地 顯示第1 a圖中所示熱軋機A之CVC滾軋機之1對工作 輥31a，31b (第la圖之b — b箭視圖）。在第 .lb圖中誇張地顯示工作輥外徑之變化。第lc圖係顯示 工作輥向軸線方向變位而輥子間隙變化之狀態。第1 d圖 係模式顯示第1 a圖中熱軋機A中之異徑輥子滾軋機3 2 。（係顯示第la圖中d部之詳細情形）。 該熱軋機Α係有配置下述之機器。首先，在最上游之 部分（第1 a圖之左方）設有加熱爐1，接著設有粗滾軋 機1 0。加熱爐1係用以加熱作爲材料之連續鑄造片（ s1ab)至攝氏1200度左右之裝置，而粗滾軋機 1 0係將加熱過之連續鑄造片滾軋成3 0mm左右之厚度 。關於粗滾軋機1 0，在圖中模式地顯示1部滾軋機，但 實際上有配置複數滾軋機之情形。然後，在粗滾軋機1 0 之下游有配置由6部滾軋機所成之精軋機3 0如圖所示* 其以後有設置捲取滾軋板之捲取機40· 在本熱軋機A中，有採用下.述之構成以便可圓滑地生 產其形狀精度很高之厚度1 . 2mm以下（尤其是1 · 0 mm以下）之薄鋼板者。 在精軋機3 0中構成前段3 1之3部滾軋機3 1A， 3 1 B，3 1 C係由所謂CVC滾軋機（輥子徑可連續地 變化）所構成。換言之，該等係如第1 a圖所示，以工作 輥31a，31b及支承輥31c，31d所構成。然後 ，在各滾軋機之工作輥31a，31b具有如第lb圖所 --------：---.1· ------ i—訂---------線 (价先《讀»-面之*4<^項再广、本茛> 本紙張尺度適用中困困家標準（CNS)A4規格（210*297公爱） .12 經濟部智慧財產局MC工消費合作杜印製 4253 ^6 A7 _____ B7 五、發明說明¢0 ) 示之隆起（CVC，即直徑之連績性變化）。工作輥 3 1 a ’ 3 1 b係如第1 c圖所示能夠同時向相反之軸長 方向移動之。以該移動來調整工作輥3 1 a，3 1 b間之 '位置關係時*可以變更其間之輥子間隙（與板X接觸之部 分）之形狀。對各滾軋機之工作輥3 1 a，3 1 b，再附 設周知之軋輥彎曲壓力機也可以。 精軋機3 0當中構成後段3 2之3部滾軋機3 2A， 3 2 B ’ 3 2 C係構成爲所謂之異徑輥子滾軋機。換言之 ，該等係如第1 a圖所示以工作輥3 2 a，3 2 b與支承 輥3 2 c，3 2 d所構成之4層之滾軋機。關於各滾軋機 之工作輥3 2 a，3 2 b爲如第1 d圖所示使用異徑之工 作輥。然後，用馬達等（未圖示）來旋轉驅動工作輥 32a ，32b當中只位於下部之大徑輥子32b，上部 之小徑之輥子3 2 a爲自由旋轉而不予以驅動。再者，各 機架附設周知之工作軋輥彎曲壓力機（未圖示）對工作輥 3 2 a，3 2 b施加彎曲壓力。關於異徑輥滾軋機之該等 3部滾軋機32A，32B，3.2C爲，一方（上方）之 工作輥3 2A爲小徑，及只驅動另一方（下方）之工作輥 3 2 B的關係，對板X有剪斷力作用時，因上方輥子爲小 徑的關係，以較低之滾軋壓力也可以充分之壓下率實行滾 軋。 在上述之熱軋機A中，首先，在精軋機3 0當中之前 段31之3部滾軋機31A，31b，31c中·如在第 1 c圖中所示，使工作輥31a * 31b向軸方向變位， — — — — — — — — — — — .I — — — — — — — <洗先明讀背®之注$項再本霣) 本紙張尺度適用ΪΗ0家楳準（CNS)A4规格<210 x 297公藿> .13- 經濟部智慧財產局貝工消费合作社印製 2 5 3 1 β Α7 ____Β7____ 五、發明說明〇1 ) 適當地變更各cvc輥子之輥子間隙之結果，與厚度及寬 度無關地可修整板X之隆起而成爲適當之間隙》又，在異 徑輥滾軋機之後段32之3部滾軋機32A，32B， • 32C當中實行低壓滾軋力之滾軋之結果，可減少有關板 X之板邊變薄•換言之，以包含有該等6部滾軋機之精軋 機3 0之熱軋機A可生產抑制隆起與板邊變薄之形狀精度 高之板。用以往之熱軋機來滾軋厚度1 . 2mm·寬度 1 2 2 Omm之鋼板時，在離板之寬度端部（邊緣）2 5 mm之位置之板面上有產生平均約5 0 之隆起，但根 據本發明者等之硏究，用本滾軋機A，生產厚度1 . 2 mm .寬度1 2 2 Omm之鋼板或厚度1 . Omm .寬度 1 0 0 0mm之鋼板時，均可使離邊緣2 5mm之位置之 隆起之平均値爲1 5 左右，最大値爲3 0 左右者 〇 同時，在本滾軋機A中，於後段3 2之3部滾軋機 32A，32B，32C中實行低壓力之滾軋之結果，能 夠有效地防止在板X之後端部產生壓折之現象。其原因是 ，降低滾軋壓力之結果*可抑制各工作輥32a，32b 對板x之非對稱性（換言之左右任何之）的力量而減少板 之左右擺動的關係•在該滾乳機A中，板X之厚度在 1 . 2mm以下之薄板也可抑制壓折之發生頻度而可圓滑 地繼續生產《用以往之熱軋機要生產厚度1 . 2mm .寬 度1 2 2 Omm‘之鋼板時以約3% (每1 0 0次有3次） 之頻度有發生壓折，但根據本發明者等之試驗之結果，用 —i — d — — —.— ·裝·1! — ！1 訂·！!線 ί».先《讀背面之注意事項再本頁) 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -14- 經濟部智慧财產局員工消费合作杜印製 A7 ____m__ 五、發明說明<*2 ) 本滾軋機A時之壓折之發生頻度爲，要製造上述尺寸之鋼 板時，把發生頻度減少至0.5%左右；又要製造1.0 mm .寬度1 2 2 0mm之鋼板時即可使發生頻度爲3% .左右》 第2a，2 b.，2c圖中•顯示本發明之其他實施形 態β首先在第2 a圖所示之熱軋機B係在粗滾軋機1 0之 最後滾軋機與精軋機3 0之第1滾軋機3 1 A之間設有隧 道式烘爐21者。隧道式烘爐21係沿著板之通過線之隧 道狀之烘爐，配置在內部之未圖示之加熱裝置（燃燒器等 )來對板加熱。粗滾軋機1 0之最後機架與精軋機3 0之 第1滾軋機3 1 Α之間，關於板之移送速度有差異（前述 之速度超過後者之速度），從前者出來之板爲以精軋機 3 0之出口之速度所定之低速度來滾軋的關係，精軋機 3 0之入口溫度爲如第4圖所示愈向後端愈降低。爲防止 該溫度降低而設置隧道式烘爐21。藉此來防止板溫度降 低時，相較於不用隧道式烘爐之情形•可降低精滾軋所需 要之滾軋壓力。如此可降低滾軋壓力，且可使前端及後端 之滾軋壓力略相等的關係，可使精軋機3 0之各滾軋機* 尤其是後段32之異徑輥子滾軋機32A，32B， 3 2 C中之滾軋壓力可設定成相當低，可進一步抑制邊緣 變薄及壓折之發生。板之後端部係在一般情形下其溫度降 低幅度是大的關係，隧道式烘爐2 1抑制壓折之發生之效 果很大；在該熱軋機B中（又，在後述之熱軋機C，D也 同樣地），比前述之熱軋機A更可降低壓折之發生頻度。 — — J — — — — — -I I — — — — — · 11 i* I ί I I I -(«先Μ讀#面之ίίϋ項再f、本頁) 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公* ) -15- A7 4 2 5 3 16 ----- B7___ 五、發明說明C3 ) 又’在該熱軋機B中，如第2 a圖中所示，配置有合 計7部滾軋機作爲精軋機3 〇。換言之，將後段3 2之3 部滾軋機32A，32B，32C做爲異徑輥滾軋機一事 '係與第la圖之熱軋機A相同，但以4部之滾軋機3 1 A ’ 31B，31C，31D構成第lb圖所示之CVC輥 子所成之前段3 1之點爲與滾軋機A相異。如上述，精軋 機3 0中之滾軋機之數量爲，如同粗軋機1 〇之滾軋機數 量，相應板之厚度及鋼種類，生產速度等而適當地矛以變 更即可。又’將精軋機3 0中之前段滾軋機之至少一部分 使用可變更輥子間隙形狀之如第3圖中所示之周知之成對 交叉滾軋機3 6者。成對交叉滾軋機3 6係將一對工作輥 36a ，36b及支承輥36c，36d同時配置成不平 行而在其中央部附近最接近之交叉狀以便可變更相互之位 置關係（角度等）之滾軋機。又，把後段3 2之滾軋機構 成爲含有C V C輥子之異徑輥子滾軋機等也是可適當地實 施作爲發明之範圍內之設計變更者。對第2 b圖，第2 c 圖所示之下述之熱軋機C，D及第1圖之熱軋機A也可實 行上述之變更。 在第2 b圖之熱軋機C中，在粗軋機1 0之最後面滾 軋機與精軋機3 0之最前面滾軋機3 1 A之間設有薄鋼片 之捲取.解捲裝置裝置2 2。捲取.解捲裝置裝置2 2係 用以捲取及解捲薄鋼片之裝置，例如加拿太之斯得爾德克 公司（Steltech Ltd)以商標名柯以爾勃克斯（Coilbox)之 商品名出售之裝置。考量進入精軋機3 0之前之板之溫度 ί — 扁—*1 I ! β * ! —線 (請先閲讀背面之注意事項再赛寓本I) 經濟部智慧財產局員工消費合作社印« 本紙張尺度適用中國國家標準<CNS)A4規格（210 X 297公釐） 16· 經濟部智慧財產局員工消费合作杜印製 4 2 5 3 16 at ____B7____ 五、發明說明（W ) 爲容易下降如前述，把長的板捲成金屬帶卷狀來減少其溫 度之下降，並把捲取之板予以解捲而再度放出來而送到精 軋機3 0者。藉此來減少板溫度之降低時，如同前述可降 ‘低精軋所需要之滾軋壓力，可有效地防止板邊變薄及壓折 之發生。 又，在第2 c圖所示之熱軋機D係連續於第1 b圖之 捲取.解捲裝置2 2，在精軋機3 0之前面設有薄鋼片加 熱器2 3者。薄鋼片加熱器2 3係用燃燒器等加熱板之前 端部及後端部之裝置，雖然用捲取.解捲裝置2 2捲成金 屬帶卷，但溫度容易下降之板之前端部與後端部即需要昇 高其溫度。壓折係在板之後端部發生之現象，因此，用該 薄鋼片加熱器2 3來加熱板之後端部時，可有效地降低該 部分之滾軋壓力，可大幅度減低壓折之發生率。 根據本發明之薄板熱軋機，具有下述之效果。即* 1 )可抑制板發生隆起及板邊變薄等之同時，可減少 在後端部發生壓折之頻度。雖然相當薄之板，但不容易發 生壓折的關係，例如在其厚度1.. 2mm以下之薄板也可 穩定地生產其厚度精度很高之薄板。 2 )不一定需要特殊的機器.裝置的關係，不僅是設 備成本低，而且對既設之熱軋機施行簡單之改造之結果， 在短期間內可構成之。又，若有可利用之既設之一般性滾 軋機時，加以輕微之改造即可極簡單地構成的優點。 3 )又，在粗軋機與精軋機之間設有防止板溫度降低 之裝置時，可.更有效地防止板邊變薄及壓折之發生。因爲 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -17- — lj ΙΓ •裝！ —訂·1 — ！！· ^^ ί锖先《讀背面之注項再填窝本貢) 經濟部智慧財產局員工消费合作社印製 1 0 Α7 _Β7_ 五、發明說明0 ) ，就送到精軋機前之板防止其溫度下降的結果，可用更低 的滾軋壓力來實行精軋的關係。 — i!· — — —.! .!—！！訂·！ _ 線 (請先閲讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -18 -Note on the side I Household 'W-bound book' I Binding paper paper size applies to China® Home Standard (CNS > A4 specification (210 X 297 mm)-6-253 1 6 A7 B7 V. Description of invention ·) Work roller For rolling mills with different diameters and only the large diameter work rolls are driven in rotation. Reducing roller rolling mill is the first one. The relationship between the work rolls is small diameter. It is easy to increase the reduction amount with a small reduction force, and it only drives the work rolls with large diameters to apply the shearing force to the rolling material. * Compared with a general rolling mill with a large work roll diameter (the same diameter), the reduction ratio can be easily increased. Therefore, compared with the conventional rolling mill and the former rolling mill (1), the reducing roller rolling mill can achieve the same reduction as the rolling mills when the rolling pressure is reduced. rate. Therefore, even in a small arrangement with a small number of rolling mills, the aforementioned effects can be exerted and a sufficient reduction ratio can be achieved. In addition, the reducer roll mill is a general roll mill with a large diameter of work rolls. A slight modification (in other words, changing one roll to a small-diameter roll, etc.) can also constitute a relationship, and it can be used. When the existing rolling mill is set up, the hot rolling mill of the present invention can be simply and cost-effectively. Read the note on the back of the book. ) Configuration of the hot rolling mill of the present invention can suppress the occurrence of bulging of the thin plate and thinning of the edge of the plate, and can reduce the frequency of folding at the rear end. This is based on the effects of a) to c) below. a) In the finishing mill, a part of (1) in the previous stage controls the change in the shape of the roll gap, and can suppress the bulging of the plate. The plate bulge occurs due to uneven roll gaps in the amplitude direction (in other words, the axial direction of the roller) caused by the roll bending of the rolling mill. However, when the control of the rolling mill (1) is appropriately changed, the plate bulge can be reduced. , Or can produce boards with appropriate green bulges. In addition, the method of changing the roll gap to control the bulge is to reduce the flatness of the plate. However, because the line is implemented in the front section of the finishing mill, the paper size is applicable. National Paper Standard (CNS) A4 (210 * 297) (%) 4 2 5 3 16 A7 B7 Printed by the Intellectual Property Bureau of the Ministry of Economy ’s Consumer Cooperatives. 5. The invention of the $) system can be used to improve the flatness in the middle or rear section, etc. β, and reduce the bulge in the front section. In this case, it is only necessary to implement the rolling in the latter part and the like, so that the rolling operation of the rollers with different diameters described later can be stabilized. b) As a result of rolling with a rolling pressure of € (2) in the rear section of the finishing mill, the rear section of the plate is not prone to buckling. The end of the plate is pressed to the horizontal direction (through the right or left of the line) after pressing the plate without tension. It happened when it hit the guide plate of the rolling mill, but the result of investigation was that the rolling pressure was understood. When the rear end is low, it is difficult to swing sideways. The reason is that the device which is estimated to be rolled cannot be manufactured in a completely left-right symmetrical relationship. In other words, according to the rolling mill and the roll system, strictly speaking, the relationship is not completely left-right symmetrical. It is considered that the plate has an asymmetric force acting on either side. Therefore, the smaller the rolling pressure, the more The strength is also reduced, and the rear end is not easy to swing. Therefore, when rolling a very thin plate in this rolling mill, it is not easy to cause the problem of creasing at the rear end of the rolling mill. "Also, the amount (amplitude) of the lateral swing of the end of the plate after the middle of the finishing mill is usually more The relationship between the rolling mill at the rear stage is more and more wide. In this rolling mill, rolling with a low rolling pressure in the rear stage can effectively prevent creasing. "C) Similarly, the rolling pressure in the second stage (2) is low. The rolling relationship can suppress the occurrence of thinning of the plate edge. The thinning of the edge of the plate is caused by the relationship between the portion where the roller is crimped on the plate and the outer portion of the width of the plate, and the arc-shaped height difference is formed on the surface of the roller. The rolling pressure is reduced. As a result of reducing the sags produced by the rollers, it is possible to reduce the thinning of the edge of the board. "Furthermore, in this hot rolling mill, two or more rolling mills are equipped (上述-0Q first read the note on the back and then r» page The paper size of the book is applicable to the Chinese national standard (CNS > A4 specification (210 * 297 mm) -8 · A7 425316 ___B7_ V. Description of the invention $) 1) of the rolling mill (CVC rolling mill or paired cross rolling mill) The relationship can effectively suppress the bulging of the plate, and the relationship between the rolling machine (reducing roller rolling machine) with (2) and the setting of more than two rolling machines can significantly reduce the rolling pressure. As a result, the crimping can be effectively suppressed. In addition to the above, the desired reduction ratio can be achieved at the same time as the thinning of the slab occurs. In the hot rolling mill of the present invention, in addition to the above, the rough rolling mill (the final rolling mill) disposed upstream and the finishing rolling mill ( The first rolling mill) Can be equipped with a device to prevent the temperature of the board from decreasing. The devices for preventing temperature drop include tunnel ovens, thin steel sheet winding and unwinding devices, and thin steel sheet heaters. The plate before being sent to the finishing mill is a low speed which is determined by the speed of one side of the finishing mill. Therefore, the residence time is longer, and the temperature decreases after the plate reaches (near the rear end). Then, in the finishing rolling mill, the temperature of the plate decreases as it advances to the later stage. However, in the hot rolling mill, the above-mentioned device for preventing the temperature of the plate from falling is used to maintain the temperature of the plate before being sent to the finishing mill, or to increase the temperature. If the plate temperature is sufficiently high, the rolling pressure required for finishing rolling is lower than when the plate temperature is low. Therefore, in the hot rolling mill which uses the above-mentioned means to prevent the temperature of the plate from falling, finishing rolling can be carried out with a lower rolling pressure (especially in the latter part. It can also make the temperature of the front end portion and the rear portion of the plate. For an equal relationship, stable rolling can be performed without any change in rolling load. Therefore, it is possible to effectively suppress the occurrence of thinning of the edge of the plate or the collapse of the roof. 1 [Simple description of the drawing] Figure 1a shows this A system diagram of a hot rolling mill according to an embodiment of the invention The paper size is applicable to the national standard (CNS) A4 specification (210 X 297 mm) 1 φ 1 i · if n II < (People of this page) Du Yin printed by Shellfish Consumer Cooperation of the Intellectual Property Bureau of the Ministry of Economic Affairs -9-Α7 4253 1 δ ____ Β7 _ V. Description of the invention f) ο Figure 1b shows the line b—b arrow view in Figure 1a This mode shows the front view of the main part of the CVC rolling mill. Fig. 1c is a diagram showing a state where the work roll is displaced in the axial direction and the roll gap is changed in Fig. 1b. Fig. Id is a detailed view of part d in Fig. 1a, and is a side view of the main part of the reducer roller rolling mode. Fig. 2a is a system diagram showing a hot rolling mill according to another embodiment of the present invention. Fig. 2b is a system diagram showing a hot rolling mill according to still another embodiment of the present invention. Fig. 2c is a system diagram showing a hot rolling mill according to another embodiment of the present invention. Fig. 3 is a diagram showing a pair of cross rolling mills. Fig. 4 is a graph showing the plate temperature on one side of the inlet of the finishing mill. Comparison Table of Main Components 1 Heating Furnace 10 Rough Rolling Mill 3 0 Finishing Rolling Mill 4 0 Winding Machine 3 1 Front Section 3 1 A Rolling Mill 3 1 B Rolling Mill This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) — Mill — — — — — H-IIIIIII — — — — (Please read the $ method on the t side first, then the purchase >> Printed by the Shelley Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs-10- Λ253 ^ 6 at B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. 5. Description of invention $) 3 1 C Rolling mill 3 1 a Work roll 31b Work roll • 31c Back-up roll 31d Back-up roll 3 2 Back-end 3 2 A Rolling mill 3 2 B Rolling mill 3 2 C Rolling mill 32a Work roll 32b Work roll 32c Back-up roll 3 2 d Back-up roll 21 Tunnel oven 36 Cross-rolling mill 36a Work roll 3 6 b Work roll 3 6 c Back-up roll 3 6 d Back-up roll 22 Winding and unwinding device 23 Thin steel sheet heater. [Best Mode for Carrying Out the Invention] An embodiment of the present invention will be described below. Figure 1a shows ------------ installation * nn ϋ nn ϋ I »ϋ I n I line (馋 Notes for reading M side and t side before rh page) This paper size applies China S Standard (CNS) A4 (210 X 297 mm) -11-4253 丨 6 A7 Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs and printed by X Consumer Cooperatives m_V. Description of the invention Φ) Hot rolling according to an embodiment of the present invention For the entire machine A, Fig. 1b is a pattern showing a pair of work rolls 31a, 31b of the CVC rolling mill of the hot rolling mill A shown in Fig. 1a (b-b arrow view in Fig. La). The change in the outer diameter of the work roll is exaggerated in the .lb diagram. Figure lc shows the state where the work roll is displaced in the axial direction and the roll gap is changed. Fig. 1d is a mode showing the different-roller rolling mill 3 2 in the hot rolling mill A in Fig. 1a. (Shows details of part d in figure la). This hot rolling mill A is equipped with the following equipment. First, a heating furnace 1 is installed in the most upstream part (left of Fig. 1a), and then a rough rolling mill 10 is installed. The heating furnace 1 is a device for heating the continuous casting sheet (s1ab) as a material to about 1200 degrees Celsius, and the rough rolling mill 10 is used to roll the heated continuous casting sheet to a thickness of about 30 mm. Regarding the rough rolling mill 10, one rolling mill is schematically shown in the figure, but in practice, a plurality of rolling mills may be arranged. Then, downstream of the rough rolling mill 10, a finishing rolling mill 3 made of 6 rolling mills is arranged as shown in the figure. * A coiling machine 40 for coiling rolling plates is installed in the future. In this hot rolling mill A Among them, those who adopt the structure described below can smoothly produce thin steel plates with a thickness of 1.2 mm or less (especially 1.0 mm or less) with high shape accuracy. The three rolling mills 3 1A, 3 1 B, and 3 1 C constituting the first stage 31 in the finishing rolling mill 30 are constituted by so-called CVC rolling mills (the roll diameter can be continuously changed). In other words, as shown in Fig. 1a, these are composed of work rolls 31a, 31b and backup rolls 31c, 31d. Then, the work rolls 31a, 31b of each rolling mill have as shown in Figure lb --------: ---. 1 · ------ i-order -------- -Line (price first "read» -face of * 4 < ^ item widen again, this buttercup >) This paper size applies to the Standard for Difficulties (CNS) A4 (210 * 297 public love). 12 Intellectual Property of the Ministry of Economic Affairs Bureau of MC Industrial and Consumer Cooperation Du printed 4253 ^ 6 A7 _____ B7 V. Description of the invention ¢ 0) The bulge (CVC, the successive change in diameter). The work rolls 3 1 a ′ 3 1 b are simultaneously movable in opposite axial length directions as shown in FIG. 1 c. When adjusting the 'positional relationship' between the work rolls 3 1 a and 3 1 b by this movement *, the shape of the roll gap (the part in contact with the plate X) between them can be changed. For the work rolls 3 1 a and 3 1 b of each rolling mill, a well-known roll bending press may be attached. Among the finishing rolling mills 30, three rolling mills 3 2A, 3 2 B '3 2 C constituting the rear stage 32 are configured as so-called different-diameter roller mills. In other words, these are four-layer rolling mills composed of work rolls 3 2 a, 3 2 b and backup rolls 3 2 c, 3 2 d as shown in Fig. 1a. Regarding the work rolls 3 2 a and 3 2 b of each rolling mill, work rolls having different diameters are used as shown in FIG. 1 d. Then, a motor or the like (not shown) is used to rotate and drive the work rolls 32a, 32b. Only the large-diameter roller 32b located at the lower portion and the small-diameter roller 32a at the upper portion rotate freely and are not driven. Furthermore, a well-known work roll bending press (not shown) is attached to each frame to apply bending pressure to the work rolls 3 2 a and 3 2 b. Regarding the three rolling mills 32A, 32B, and 3.2C of the reducer roll mill, the relationship between the work roll 3 2A of one side (upper side) is a small diameter, and the work roll 3 2 B of the other side (lower side) is driven. When there is a shearing force on the plate X, because the upper rollers have a small diameter relationship, rolling can be performed at a lower rolling rate with a lower rolling pressure. In the above-mentioned hot rolling mill A, first, in the finishing rolling mill 30, the three rolling mills 31A, 31b, and 31c in the previous stage 31. As shown in FIG. 1c, the work rolls 31a * 31b are directed toward the shaft. Directional displacement, — — — — — — — — — — — —. — — — — — — — ≪ Notes of Washing, Reading, and Recalling ® Items in this paper and then this paper)) This paper standard applies to 0 home standards (CNS) ) A4 specifications < 210 x 297 public 藿 > .13- Printed by Shelley Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs 2 5 3 1 β Α7 ____ Β7 ____ 5. Description of the invention 〇 1) Change the roller gap of each cvc roller appropriately As a result, the bulge of the plate X can be trimmed regardless of the thickness and width, and a proper gap can be achieved. Furthermore, the low-pressure rolling force of the three rolling mills 32A, 32B, and 32C in the rear section of the reducer rolling mill is implemented. As a result of the rolling, the thinning of the edge of the plate X can be reduced. In other words, the hot rolling mill A of the finishing rolling mill 30 including these 6 rolling mills can produce a shape with high accuracy that suppresses bulging and thinning of the edge of the plate. board. When a steel plate having a thickness of 1.2 mm and a width of 12 2 mm is rolled by a conventional hot rolling mill, an average of about 50 is raised on the surface of the plate at a position 2 5 mm away from the width end (edge) of the plate. However, according to the research of the present inventors, when using this rolling mill A to produce a steel plate with a thickness of 1.2 mm, a width of 122 mm, or a steel plate with a thickness of 1.0 mm, and a width of 100 mm, it can be separated. The average height of the ridges at the edge of 25 mm is about 15 and the maximum is about 30. At the same time, in this rolling mill A, low pressure is implemented in the three rolling mills 32A, 32B, and 32C in the later stage 32. As a result of the rolling, it is possible to effectively prevent the phenomenon that the end portion of the plate X is crimped. The reason is that as a result of reducing the rolling pressure, the asymmetrical (in other words, left and right) force of each work roll 32a, 32b on the plate x can be suppressed, and the relationship between the left and right swing of the plate can be reduced. , The thickness of the sheet X is less than 1.2mm, and the frequency of creasing can be suppressed, and the production of steel plates with a thickness of 1.2mm and a width of 12.2mm by conventional hot rolling mills can be smoothly continued. About 3% (three times every 100 times) the occurrence of folding, but according to the test results of the inventors, etc., use -i-d---.-· Equipment · 1! —! 1 Order! ! 线 ί »." Precautions on the back of the page, then this page) This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) -14- Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs A7 ____m__ 5. Description of the invention < * 2) The frequency of creasing during the rolling mill A is to reduce the frequency of occurrence to about 0.5% when the steel plate of the above size is to be manufactured; 1.0 mm is also required. Width 1 2 For a 20mm steel plate, the frequency of occurrence is about 3%. Figures 2a, 2b., 2c. • Other embodiments of the present invention are shown. Β First, the hot rolling mill B shown in Figure 2a is in A tunnel oven 21 is provided between the last rolling mill of the rough rolling mill 10 and the first rolling mill 3 1 A of the finishing rolling mill 30. The tunnel-type oven 21 is a tunnel-shaped oven along the passage line of the plate, and a heating device (burner, etc.) (not shown) arranged inside is used to heat the plate. Between the last stand of the rough rolling mill 10 and the first rolling mill 3 1 Α of the finishing mill 30, there is a difference in the transfer speed of the plate (the aforementioned speed exceeds the latter speed). In the relationship of rolling at a low speed set by the exit speed of the rolling mill 30, the inlet temperature of the finishing mill 30 is lowered toward the rear end as shown in FIG. 4. A tunnel oven 21 is provided to prevent this temperature from decreasing. This can prevent the plate temperature from lowering, and can reduce the rolling pressure required for finishing rolling, compared to the case without a tunnel oven. In this way, the rolling pressure can be reduced, and the relationship between the rolling pressures at the front end and the rear end can be slightly equal, which can make the rolling mills 30 of the finishing mill *, especially the different-diameter roller rolling mills 32A, 32B, 3 2 of the rear stage 32. The rolling pressure in C can be set to be relatively low, which can further suppress the occurrence of edge thinning and creasing. The end of the plate after the plate is generally related to its temperature reduction. The tunnel oven 21 has a great effect in suppressing the occurrence of creasing. In this hot rolling mill B (also, the hot rolling mill described later) The same applies to C and D), and the occurrence frequency of creasing can be reduced more than the aforementioned hot rolling mill A. — — J — — — — — -II — — — — — · 11 i * I ί III-(«先 Ｍ 读 # 面 之 ίϋϋ Item, f, this page) The paper size applies to Chinese National Standard (CNS) A4 Specifications (210 X 297 male *) -15- A7 4 2 5 3 16 ----- B7___ V. Description of the invention C3) Also 'in this hot rolling mill B, as shown in Figure 2a, it is equipped with A total of 7 rolling mills were used as finishing mills 30. In other words, the use of the three rolling mills 32A, 32B, and 32C in the latter stage as the different-diameter rolling mills is the same as that of the hot rolling mill A shown in FIG. 1a, but the four rolling mills 3 1 A '31B, 31C and 31D are different from the rolling mill A in that the former 31 formed by the CVC roller shown in FIG. 1b is different. As described above, the number of rolling mills in the finishing rolling mill 30 is the same as the number of the rolling mills in the rough rolling mill 10, the thickness of the plate, the type of steel, the production speed, etc. may be appropriately changed to change. Also, at least a part of the former rolling mill in the finishing rolling mill 30 uses a well-known paired cross rolling mill 36 which can change the shape of the roll gap as shown in FIG. 3. The pair of cross rolling mills 3 and 6 are a pair of work rolls 36a, 36b and backup rolls 36c, 36d arranged at the same time in a non-parallel manner and closest to each other near the center thereof so as to change the mutual positional relationship (angle, etc.) Rolling machine. It is also possible to appropriately implement a design change within the scope of the invention by making the rolling mechanism of the second stage 32 into a reduced-diameter roller rolling machine including a C V C roller. The above hot rolling mills C and D shown in Figs. 2b and 2c and the hot rolling mill A shown in Fig. 1 can be modified as described above. In the hot rolling mill C in Fig. 2b, a coil of thin steel sheet is provided between the rearmost rolling mill of the rough rolling mill 10 and the frontmost rolling mill 3 1 A of the finishing rolling mill 30. The unwinding device device twenty two. Winding. Unwinding device device 2 2 is a device for winding and unwinding thin steel sheets. For example, Steltech Ltd. (Celbox) under the brand name Coilbox Sold under the brand name. Consider the temperature of the board before entering the finishing mill 3 0 ί — flat — * 1 I! Β *! — Line (please read the notes on the back before playing the book I) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs «This paper The scale is applicable to the Chinese National Standard < CNS) A4 specification (210 X 297 mm) 16 · Consumption Cooperation by Employees of the Intellectual Property Bureau of the Ministry of Economic Affairs 4 2 5 3 16 at ____B7____ V. Description of the invention (W) is easy to fall as previously mentioned The long plate is rolled into a metal strip to reduce the temperature drop, and the rolled plate is unrolled and released again and sent to the finishing mill 30. As a result, when the temperature of the plate is reduced, as described above, the rolling pressure required for low finish rolling can be reduced, which can effectively prevent the edge of the plate from thinning and creasing. The hot rolling mill D shown in Fig. 2c is a coiling and unwinding device 22 continuously shown in Fig. 1b, and a thin steel sheet heater 23 is provided in front of the finishing mill 30. The thin steel sheet heater 2 3 is a device for heating the front end and the rear end of the plate with a burner, etc. Although it is coiled. The unwinding device 2 2 is rolled into a metal strip, but the temperature of the front end of the plate is easy to drop. The rear part needs to increase its temperature. Crimping is a phenomenon that occurs at the rear end of the plate. Therefore, when the thin steel sheet heater 23 is used to heat the rear end of the plate, the rolling pressure of the portion can be effectively reduced, and the occurrence of low-pressure folding can be greatly reduced. rate. The thin-plate hot rolling mill according to the present invention has the following effects. That is, * 1) while suppressing the occurrence of bulging and thinning of the edge of the plate, it is possible to reduce the frequency of creasing at the rear end portion. Although it is a relatively thin plate, it is not easy to have a creased relationship. For example, a thin plate having a thickness of 1.2 mm or less can stably produce a thin plate with high thickness accuracy. 2) The relationship between special machines and equipment is not necessarily required. Not only is the cost of the equipment low, but also the simple transformation of the existing hot rolling mill can be constructed in a short period of time. In addition, if there is an existing general rolling mill that can be used, it can be constructed very simply by slight modification. 3) Furthermore, when a device for preventing the temperature of the plate from being lowered is provided between the rough rolling mill and the finishing mill, the occurrence of thinning and creasing of the edge of the plate can be prevented more effectively. Because this paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) -17- — lj ΙΓ • Install! —Order · 1—! !! · ^^ ί "First read the note on the back and then fill in the nest tribute) Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economy 1 0 Α7 _Β7_ V. Description of the invention 0), send it to the plate before the finishing mill to prevent its temperature As a result, the finishing rolling relationship can be implemented with a lower rolling pressure. — I! · — — —.!.! —! !! Order! _ Line (Please read the precautions on the back before filling out this page) This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) -18-