TW200523046A - Controllable cooling method for thick steel plate, thick steel plate manufactured by the controllable cooling method, and cooling device for the thick steel plate - Google Patents

Controllable cooling method for thick steel plate, thick steel plate manufactured by the controllable cooling method, and cooling device for the thick steel plate Download PDF

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TW200523046A
TW200523046A TW093116860A TW93116860A TW200523046A TW 200523046 A TW200523046 A TW 200523046A TW 093116860 A TW093116860 A TW 093116860A TW 93116860 A TW93116860 A TW 93116860A TW 200523046 A TW200523046 A TW 200523046A
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Taiwan
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cooling
steel plate
thick steel
width direction
cooling device
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TW093116860A
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Chinese (zh)
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TWI286089B (en
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Satoshi Ueoka
Kenji Ihara
Yoshinori Yuge
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Jfe Steel Corp
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals

Abstract

A controllable cooling method for a hot rolled thick steel plate, a thick steel plate manufactured by the controllable cooling method, and a cooling device for the thick steel plate. Specifically, the controllable cooling method for the thick steel plate, the method wherein the temperature distribution of the thick steel plate in the lateral direction is uniformized before or at the beginning of the controllable cooling, and the entire part of the thick steel plate in the lateral direction is cooled by the controllable cooling device at a same cooling rate.

Description

200523046 玖、發明說明： 【發明所屬之技術領域】 本發明係有關完成熱軋的厚鋼板（s t e e 1 p 1 a t e )之控 制冷卻方法（accelerated control cooling system)及 利用該控制冷卻方法所製造之厚鋼板及其冷卻裝置。 【先前技術】 於厚鋼板的製造中，為確保鋼板所要求的機械性質，特 別是強度及韌性，有時候對輥軋後的厚鋼板進行冷卻速度 大的控制冷卻。控制冷卻係在熱軋後，急速冷卻自沃斯田 鐵（austenite)至肥粒鐵（ferrite)的相變溫度區域 (transformation range)»控制相變組織，調整鋼的結晶 組織，獲得目標機械性質等的材質的技術。又，為同時確 保厚鋼板全體材質的均一性，抑制冷卻後厚鋼板應變 (strain)的發生，須對厚鋼板面全體進行均一冷卻。另 一方面，冷卻後之厚鋼板四周部（four periphery zones)相 較於厚鋼板中央部成過冷（supercooling)狀態，厚鋼板面全 體未進行均一冷卻則是現階段控制冷卻技術的實際情況。 為因應此種要求，曰本專利特開平1 0 - 5 8 0 2 6號公報揭示 有使冷卻水成為相對於鋼板運送方向成指定角度，與鋼板 的寬度方向具指定間距的複數個平行的高速水膜，碰撞鋼 板表面的技術。且其提議碰撞後的冷卻水以碰撞區為界左 右平分，沿鋼板表面形成流水區，又，碰撞區的端部配置 成自鋼板運送方向視成不相互重疊狀連續般而予以冷卻的 高溫鋼板之冷卻方法。 5 312/發明說明書(補件)/93-08/93116860 200523046 又，曰本專利特開平6 — 1 8 4 6 2 3號公報（曰本專利第 2 6 9 8 3 0 5號公報）中就冷卻經過精軋並矯正輥軋波的厚鋼 板的方法提議，自設於控制冷卻裝置入口側之具有高冷卻 能力的細縫喷射（s 1 i t j e t )冷卻喷嘴對厚鋼板傾斜喷射 高壓水流，遮蔽朝向厚鋼板寬度方向兩端部的水流之手段。 又，日本專利特開昭6 1 — 2 1 9 4 1 2號公報測定輥軋熱鋼 板之冷卻前的鋼板寬度方向之溫度分布，根據此測定結果 運算朝該熱鋼板的寬度方向之水量分布。接著，提議有特 點為於該熱鋼板的正前方使用已冷卻的前導熱鋼板之冷卻 後的溫度資料，校正前述運算水量分布，根據該校正運算 冷卻水量分布，調整熱鋼板的寬度方向注水量分布的熱鋼 板之均一冷卻方法。 又，日本專利特開昭5 8 — 3 2 5 1 1號公報揭示使冷卻水碰 撞熱軋後的厚鋼板的上面及下面，藉遮蔽導水管遮蔽前述 厚鋼板的端部，一面防止上面冷卻水流直接碰撞前述厚鋼 板的端部，一面冷卻前述厚鋼板的技術。而且，根據前述 厚鋼板的板寬、上下面冷卻水量以及冷卻開始時之前述厚 鋼板的板寬方向的溫度分布，運算在冷卻結束時沿前述厚 鋼板寬度方向獲得均一溫度分布的前述遮蔽導水管對前述 厚鋼板端部的遮蔽寬度。其提議特點在於根據如此獲得的 運算結果，控制前述遮蔽導水管的位置，俾獲得前述遮蔽 寬度的厚鋼板之冷卻方法。 上述四個之日本專利特開平1 0 — 5 8 0 2 6號公報、特開平 6 — 1 8 4 6 2 3號公報（日本專利第2 6 9 8 3 0 5號公報）、特開昭 312/發明說明書(補件)/93-08/93116860 200523046 6 1 — 2 1 9 4 1 2號公報及特開昭5 8 — 3 2 5 1 1號公報所揭示的手 段均係防止在冷卻時，於厚鋼板的板寬方向之端部發生過 冷現象的技術。雖然可預見其效果達到某一程度，於均一 冷卻厚鋼板全體方面卻仍殘留有問題。此等發明的技術思 想係針對於冷卻前及/或冷卻中在厚鋼板寬度方向之端部 發生的過冷，在冷卻中僅減慢厚鋼板寬度方向的端部之冷 卻速度，使冷卻後的厚鋼板寬度方向之溫度分布均一之技 術。因此，根據此等提議時，為使厚鋼板的板面内之溫度 分布均一，須犧牲某一程度的冷卻速度，而成為提昇材質 之瓶頸。甚而，這些提議無法確保於輥軋途中之中間軋材 的至頭尾端部（top and tail end )的溫度均一性，有在 冷卻後發生應變之虞。又，如後述，由於未考慮到關於膜 沸騰(film boiling)或過渡沸騰(transition boiling) 等冷卻中導熱形態的變化，故難以控制厚鋼板的板端部之 冷卻速度，即使可調整包含板厚或冷卻開始溫度、冷卻結 束溫度、冷卻水量等特定條件，在冷卻條件變化情形下， 大多無法調整，由於亦無有關此方面的具體記述，故實際 作業困難。 又，曰本專利特開昭6 1 — 1 5 9 2 6揭示於一面以複數軋輥 自上下面輾壓熱鋼板，一面注液冷卻（water flowcooling) 的方法中，在配置於每對軋輥間的上方及/或下方的管集 箱設置可任意控制啟閉時間的切斷閥之技術。其更提議特 點在於設置該熱鋼板的通過位置的檢測手段與檢測冷卻開 始前該熱鋼板縱長方向的溫度分布手段以及冷卻運算控制 7 312/發明說明書(補件)/93-08/93116860 200523046 手段，啟閉控制相當於移動中該熱鋼板的前端部及/或後 端部會通過位置的管集箱之切斷閥的熱鋼板之冷卻方法。 但於日本專利特開昭6 1 — 1 5 9 2 6公報雖係防止於冷卻之 際，厚鋼板在縱長方向的頭尾端部發生過冷現象的技術， 但此等之提議卻係無法確保於軋材寬度方向的中央部之溫 度均一性，且無法避免冷卻後的應變或鋼板端部的應力殘 留的手段。 又，日本專利特開平1 1 — 2 6 7 7 3 7號公報揭示控制冷卻 已熱軋的高溫鋼板，製造鋼板之鋼板製造方法。並且提議 特點在於藉設於粗軋機（r 〇 u g h i n g m i 1 1 )與精軋機 (finishing m i 1 1 )之間的冷卻裝置，進行沿厚鋼板寬度 方向具有溫度分布的冷卻，俾補償自加熱爐至粗軋結束為 止所發生的厚鋼板的板端部附近之溫度下降量以及推定於 精軋時發生的板端部附近之溫度下降量，於精軋後，在沿 厚鋼板寬度方向均一冷卻條件下進行控制冷卻的厚鋼板之 製造方法。但日本專利特開平1 1 — 2 6 7 7 3 7號公報雖在精軋 前的早期階段實施厚鋼板寬度方向的端部之溫度補償，不 過，畢竟難以預測精軋結束時厚鋼板寬度方向的溫度分布 會達到均一的精軋前的溫度分布。其除了於輥軋中，厚鋼 板的板端部自厚鋼板的上下面方向及厚鋼板的側面發生放 射及自然對流所造成的冷卻外，還於輥軋中發生為控制厚 鋼板的形狀或表面狀態而利用水喷注（w a t e r j e t )去銹 (descaling)所造成的冷卻，容易於厚鋼板寬度方向的端 部或厚鋼板的頭尾端發生溫度分布之偏差。特別是去銹以 312/發明說明書(補件)/93-08/93116860 200523046 作業員一面觀看厚鋼板的狀態一面判斷使用或不使用的情 形居多，難以藉由粗軋結束階段的溫度分布控制，使再現 性良好地將精軋結束時的溫度分布均一化。 又，於控制冷卻中並未提示使厚鋼板寬度方向呈均一的 溫度分布之具體方法，而難以實現。 又，日本專利特開2 0 0 1 — 1 3 7 9 4 3號公報提議特點為於 熱軋結束後，對金屬板的寬度端緣部加熱，其後進行水冷 卻及/或熱矯正的金屬板之平坦度控制方法。但日本專利 特開2 0 0 1 — 1 3 7 9 4 3號公報有在藉燃燒爐（b u r n e r )加熱情 形下，因加熱效率差而必須使用大容量的燃燒爐，使加熱 成本增南^甚至有厚鋼板的加熱部被氧化之表面性狀悲受 損的問題。由於在感應加熱情形下，設備成本及加熱成本 變得非常高，故不實際。又由於並未提示即使厚鋼板之板 寬方向的溫度分布藉任何裝置於冷卻前均一化，仍於其後 冷卻，使厚鋼板寬度方向的溫度分布變得均一的方法，故 如前述，因冷卻裝置而發生沸騰現象或鋼板上面的滯留水 自端部落下所引發之厚鋼板端部的被水量增加造成的過 冷。 【發明内容】 本發明之問題在於解決上述習知技術的問題，其提議於 控制冷卻完成親軋的厚鋼板之際，可使板面内的溫度分布 於厚鋼板的寬度方向、厚鋼板的縱長方向全區呈均一化， 且全體冷卻速度大的厚鋼板之控制冷卻方法、利用該控制 冷卻方法所製造之厚鋼板及裝置。又提供厚鋼板的板寬方 9 312/發明說明書(補件)/93-08/93116860 200523046 向或厚鋼板的縱長方向的殘留應力（residual st res; 布為均一，不會發生切條彎梹（c a m b e r )等加工形狀 的厚鋼板之冷卻方法、利用該控制冷卻方法所製造之 板及裝置。 亦即，本發明為一種厚鋼板之冷卻方法，係完成熱 厚鋼板之控制冷卻方法，具有：第1冷卻步驟，其係 均一化厚鋼板寬度方向的溫度分布且一面冷卻；以及 冷卻步驟，其係在厚鋼板寬度方向的溫度分布均一化 之後，以相同冷卻速度控制冷卻厚鋼板的寬度方向全 又，本發明為完成熱軋之厚鋼板之控制冷卻方法， 前述第1冷卻步驟係藉具有複數獨立冷卻區之通過型 冷卻裝置的一個以上的入口側冷卻區，一面限制厚鋼 度方向兩側端部的冷卻水量，一面冷卻；前述第2冷 驟係藉前述一個以上的入口側冷卻區的後續冷卻區， 同冷卻速度控制冷卻厚鋼板的寬度方向全體。 又，本發明為完成熱軋之厚鋼板之控制冷卻方法， 前述第1冷卻步驟係藉預備冷卻裝置，一面限制厚鋼 度方向兩側端部的冷卻水量，一面冷卻；前述第2冷 驟係藉設於前述預備冷卻裝置後段的具有複數獨立冷 之通過型控制冷卻裝置，以相同冷卻速度控制冷卻厚 的寬度方向全體。 又，本發明係於上述方法中，藉設於厚鋼板寬度方 部的遮蔽構件（in a s k i n g in e m b e r )進行前述鋼板寬度 兩側端部的冷卻水量限制之厚鋼板之控制冷卻方法。 312/發明說明書(補件)/93-08/93116860 ;)分 不良 厚鋼 軋的 一面 第2 結束 體。 其中 控制 板寬 卻步 以相 其中 板寬 卻步 卻區 鋼板 向端 方向 10 200523046 又，本發明係於上述方法中，在前述控制冷卻裝置前段 的冷卻中，限制厚鋼板縱長方向頭尾端部的冷卻水量之厚 鋼板之控制冷卻方法。 又，本發明係於上述方法中，在前述預備冷卻裝置或前 述預備冷卻裝置及前述控制冷卻裝置的冷卻中，限制厚鋼 板縱長方向頭尾端部的冷卻水量之厚鋼板之控制冷卻方 法。 又，本發明係於上述方法中，藉利用厚鋼板縱長方向頭 尾端部的通過信號作動指定時間的水量控制裝置，進行厚 鋼板縱長方向頭尾端部的冷卻水量限制之厚鋼板之控制冷 卻方法。 又，本發明係於上述方法中，前述控制冷卻裝置的前段 部於各區間設置遮蔽構件，該遮蔽構件設在可進行厚鋼板 寬度方向端部的水量限制的厚鋼板寬度方向端部，遮蔽構 件可於各區及上下面分別獨立遮蔽厚鋼板寬度方向端部的 冷卻水的厚鋼板之控制冷卻方法。 又，本發明係於上述方法中，具有測定控制冷卻前厚鋼 板寬度方向的溫度分布之手段與根據所測定的溫度分布， 解析厚鋼板寬度方向端部之溫度下降量及與發生溫度下降 的厚鋼板寬度方向端部間之距離，根據其結果，運算設於 控制冷卻裝置前段的各冷卻區的遮蔽構件之遮蔽量以及實 施遮蔽之冷卻區數，根據運算結果控制遮蔽構件之厚鋼板 之控制冷卻方法。 又，本發明係於上述方法中，測定預備冷卻前厚鋼板寬 11 312/發明說明書(補件)/93-08/93116860 200523046 度方向之溫度分布，由所測定溫度分布解析厚鋼板寬度方 向端部之溫度下降量及與發生溫度下降的厚鋼板寬度方向 端部間之距離，根據其結果，運算預備冷卻裝置中遮蔽構 件的遮蔽量以及冷卻時間，根據運算結果，實施利用預備 冷卻裝置的冷卻之厚鋼板之控制冷卻方法。 又，本發明係在熱軋後，藉由上述控制冷卻方法控制冷 卻所製造之厚鋼板。 又，本發明為厚鋼板之控制冷卻裝置，係具有複數個獨 立冷¥卩區的通過型控制冷卻裝置，各冷卻區可進行冷卻 水量密度在12001iter (以下簡稱為L) /πι:ίη·ηι2 (升/ 分•米2 )以上的通水，並於前段冷卻區設置限制厚鋼板 寬度方向兩側端部的冷卻水量之遮蔽構件。 又，本發明為厚鋼板之控制冷卻裝置，係於輥軋機後面 依序排列預備冷卻裝置、控制冷卻裝置的冷卻裝置，前述 預備冷卻裝置的投入水量密度在5 0 0 L ( 1 i t e r之略）/ n] i η · m2以下，且設置限制厚鋼板寬度方向兩側端部的冷 卻水量之遮蔽構件，又，前述控制冷卻裝置係具有複數個 獨立冷卻區的通過型裝置，各冷卻區可進行冷卻水量密度 在1 2 0 0 L / m i η · in2以上的通水。 又，本發明係於上述裝置中，控制前述遮蔽構件的動 作，俾使前述厚鋼板寬度方向的溫度分布均一化之厚鋼板 之控制冷卻裝置。 又，本發明係於上述裝置中，具有利用厚鋼板縱長方向 頭尾端部之通過信號，作動指定時間的水量控制手段之厚 12 312/發明說明書(補件)/93-08/93116860 200523046 鋼板之控制冷卻裝置。 又，本發明係於上述裝置中，前述控制冷卻裝置使用細 縫噴射（s 1 i t j e ΐ )冷卻喷嘴（η ο z z 1 e )之厚鋼板之控制 冷卻裝置。 又，本發明係於上述裝置中，前述預備冷卻裝置使用層 流（1 a ni i n a r f 1 〇 w )冷卻喷嘴，前述控制冷卻裝置使用細 縫喷射冷卻噴嘴之厚鋼板之控制冷卻裝置。 又，本發明係於上述裝置中，設於前述控制冷卻裝置前 段部的冷卻區間的遮蔽構件可——於各冷卻區及各上下面 分別獨立，遮蔽厚鋼板寬度方向端部的冷卻水之構造之厚 鋼板之控制冷卻裝置。 又，本發明係於上述裝置中，具有測定控制冷卻前厚鋼 板寬度方向的溫度分布之手段與根據所測定的溫度分布， 解析厚鋼板寬度方向端部之溫度下降量及與發生溫度下降 的厚鋼板寬度方向端部間之距離之手段，並具有根據其結 果，運算設於控制冷卻裝置前段各冷卻區的遮蔽構件的遮 蔽量以及實施遮蔽的冷卻區數之手段，又具有根據運算結 果控制遮蔽構件的機構之厚鋼板之控制冷卻裝置。 又，本發明係於上述裝置中，具有測定預備冷卻前厚鋼 板寬度方向的溫度分布之手段及由所測定溫度分布解析厚 鋼板寬度方向的端部之溫度下降量及與發生溫度下降的厚 鋼板寬度方向端部間之距離之手段，並具有根據其結果， 運算於預備冷卻裝置的遮蔽構件的遮蔽量以及冷卻時間之 手段，又具有可根據運算結果，可控制預備冷卻裝置中遮 13 312/發明說明書(補件)/93-08/93116860 200523046 蔽構件及通板速度的機構之厚鋼板之控制冷卻裝置。 又，本發明係於上述裝置中，在前述控制冷卻裝置 或在前述預備冷卻裝置與前述控制冷卻裝置之間設置 機之厚鋼板之控制冷卻裝置。 【實施方式】 茲對照習知方法，就本發明之技術思想加以說明。 顯示習知方法亦即厚鋼板板寬方向的板端部之過冷防 法中，厚鋼板的溫度歷時變化。於習知方法中，在控 卻前，厚鋼板板寬方向的板端部之溫度已較厚鋼板中 低。藉由於此後控制冷卻中，將遮蔽構件置於厚鋼板 方向的板端部，或調整冷卻水量，減少被覆於厚鋼板 方向的板端部之冷卻水量，下降冷卻速度，使其較厚 中央部低。其為冷卻結束時，均一化厚鋼板板寬方向 端部與厚鋼板中央部的溫度之技術。此問題係如下述 因於厚鋼板板寬方向的板端部之冷卻速度較厚鋼板中 低，故厚鋼板板寬方向的板端部無法獲得與厚鋼板中 相同的材質。 於此，厚鋼板四周部(four periphery zones )的 現象，係可考慮為藉由下述三個機制所發生。 (1 )肇因於輥軋中的氣冷 若藉一般軋輥製程製造厚鋼板，於輥軋階段，在厚 的四周部自厚鋼板的上下面空氣冷卻（氣冷（air cooling))外，亦自厚鋼板的側面空氣冷卻（氣冷）， 度較厚鋼板中央部低。又，即使於控制冷卻此種厚鋼 312/發明說明書(補件)/93-08/93116860 前， 橋正 圖3 止方 制冷 央部 板寬 板寬 鋼板 的板 般， 央部 央部 過冷 鋼板 故溫 板情 14 200523046 形下，在冷卻中以均一冷卻能力對厚鋼板全面冷卻，仍因 在冷卻前厚鋼板的四周部較厚鋼板的中央更為過冷，故亦 於冷卻後保持此溫度分布。 (2 )肇因於水冷中的沸騰現象 若於冷卻前鋼板内有溫度分布偏差狀態下對厚鋼板進 行冷卻，溫度分布偏差將擴大。茲使用圖1對此詳加說明。 圖1顯示冷卻7 0 0 °C以上的高溫厚鋼板之際的厚鋼板表面 溫度與熱通量（h e a t f 1 u X )的關係（每單位面積、單位時 間的熱通量過渡（transition of heat flux))。於厚鋼板 表面溫度高狀態下為膜沸騰（f i 1 m b o i 1 i n g )，於厚鋼板 表面溫度低狀態下為核沸騰（n u c 1 e a t e b o i 1 i n g )，於此 中間溫度區域為過渡沸騰（transition boiling )。於厚 鋼板表面溫度高狀態下，存在的膜沸騰在厚鋼板表面與冷 卻水之間發生蒸氣膜（v a ρ 〇 r f i 1 m )，藉此蒸氣膜内的熱傳 導使呈導熱的狀態，熱通量（冷卻能力）低。另一方面， 於厚鋼板表面溫度低狀態下，存在的核沸騰出現厚鋼板表 面與冷卻水直接接觸，且立刻發生冷卻水的一部分自厚鋼 板表面蒸發出來的蒸氣泡（v a ρ 〇 r b u b b 1 e )，藉周圍的冷卻 水冷凝而消失的複雜現象。由於蒸氣泡的產生、消失隨之 產生冷卻水的攪拌，故有極高熱通量（冷卻能力）。如圖1 所示，此核沸騰、膜沸騰區域，具有厚鋼板的溫度越高， 熱通量（冷卻能力）越高，厚鋼板的溫度越低，熱通量（.冷 卻能力）越低的熱傳導特性。因此，於冷卻前鋼板内有溫 度分布偏差情形下，越是厚鋼板的高溫部，冷卻速度越高， 312/發明說明書(補件)/93-08/93116860 15 200523046 越是厚鋼板的低溫部，冷卻速度越低，有冷卻前的溫度分 布偏差縮小的熱傳導特性。另一方面，厚鋼板的表面溫度 於中間溫度區域成為膜沸騰與核沸騰混合的過渡沸騰狀 態。過渡沸騰狀態異於核沸騰或膜沸騰，會隨著厚鋼板溫 度降低，發生熱通量（冷卻能力）增大的現象，由於厚鋼 板溫度越低，熱通量（冷卻能力）越高，且由於若於冷卻 前在鋼板内有溫度分布偏差^即越是厚鋼板的低溫部’越 易冷卻，故冷卻後的溫度分布偏差擴大。又若增高冷卻水 量密度，即如圖1的虛線所示，自膜沸騰轉移至核沸騰的 表面溫度T t f增高，於冷卻的初期階段開始過渡沸騰。進 一步將冷卻水量密度增高情形下，可能在冷卻初期開始因 核沸騰的冷卻。另一方面，若減少冷卻水量密度，自膜沸 騰轉移至核沸騰的表面溫度T t f即降低，可於冷卻中全部 膜沸騰。 由於一般控制冷卻尚未考慮此點，大多以發生過渡沸騰 的冷卻水量密度冷卻，故擴大冷卻後的溫度分布偏差的情 形居多。 (3 )肇因於厚鋼板上面的排水 在厚鋼板成水平狀態冷卻情形下，如圖2所示，於厚鋼 板的上部，冷卻水朝外周方向流動，自板端部落下。因此， 在厚鋼板上面的端緣部分A，以設於厚鋼板上部的噴嘴所 噴射的冷卻水，加上排至厚鋼板板端部的冷卻水予以冷 卻，故厚鋼板上面的端緣部分的被水量增多，冷卻速度變 大。且由於在厚鋼板的下面側，碰撞厚鋼板的冷卻水快速 16 312/發明說明書(補件)/93-08/93116860 200523046 落下，故未發生此種現象。 基於上述三種機制（m e c h a n i s m )，控制冷卻後厚鋼板四 周部的溫度較厚鋼板中央部低。因此，即使於冷卻後不久 鋼板的形狀均一，仍因此厚鋼板内的溫度分布偏差而於其 後的氣冷過程中，在高溫厚鋼板中央部熱收縮量（v a 1 u e of heat shrinkage)大，在厚鋼板四周部熱收縮量少，從 而使厚鋼板發生殘留應力（residual stress)，於厚鋼板 發生應變。又，即使未發生應變，應力仍殘留於厚鋼板的 端部，故若於客戶端進行切條加工等，即有於厚鋼板四周 部發生所謂切條彎拱的翹曲之問題。又由於在厚鋼板四周 部冷卻至預期以上的低溫，故發生厚鋼板的材質亦變化， 強度增高等問題。因此，本發明由以下二個技術思想所構 成。 (1 )在控制冷卻前不久或控制冷卻初期，使厚鋼板寬度方 向的溫度分布均一化。 (2 )於控制冷卻中，自厚鋼板寬度方向的端部至厚鋼板中 央部以相同的冷卻速度冷卻。 茲使用圖4及圖5進行其具體說明。圖4顯示於控制冷 卻初期，使厚鋼板寬度方向的溫度分布均一化，於其後的 控制冷卻，厚鋼板端部及厚鋼板中央部以相同的冷卻速度 均一冷卻時之溫度歷時變化。本發明於控制冷卻初期，進 行利用遮蔽物對厚鋼板寬度方向端部所作的水量控制，於 厚鋼板中央部通常實施控制冷卻。於其後在鋼板寬度方向 的端部及厚鋼板中央部達到相同溫度時，自厚鋼板寬度方 17 312/發明說明書(補件)/93-08/93116860 200523046 向的端部至厚鋼板中央部以相同的冷卻速度冷¥卩。由於若 是此種程序，厚鋼板寬度方向的端部及厚鋼板中央部的冷 卻速度及冷卻停止溫度即一致，故厚鋼板寬度方向的材質 均一化。圖5顯示於控制冷卻前，藉預備冷卻裝置使厚鋼 板寬度方向的溫度分布均一化，並藉由其後的控制冷卻， 厚鋼板寬度方向的端部及厚鋼板中央部以相同冷卻速度予 以冷卻時之溫度歷時變化。由於在此情形下，於控制冷卻 中，厚鋼板寬度方向的端部與厚鋼板中央部的冷卻速度亦 一致，故可獲得與前述圖4相同的效果。 接著，於控制冷卻裝置中，為使於厚鋼板寬度方向以相 同冷卻速度冷卻而進行核沸騰冷卻。根據圖1，雖若冷卻 中厚鋼板的表面溫度變成過渡沸騰區域，冷卻後的溫度分 布偏差會擴大，但由於在核沸騰區域，溫度越高冷卻能力 越高（熱通量越高），故即使於冷卻前有溫度分布偏差，其 差仍縮小，可減少厚鋼板寬度方向的板端部與厚鋼板中央 部的冷卻能力差異。又若如本案，冷卻前的厚鋼板内的溫 度分布均一，因原來就無厚鋼板内的溫度分布偏差，故於 原理上，在冷卻後亦可能無溫度分布偏差。 又，圖2說明由於在厚鋼板上面的板端部，以設於厚鋼 板上部的噴嘴所喷射的冷卻水，如上排至厚鋼板端部的冷 卻水予以冷卻，故被水量增多，冷卻速度變大。相對於此， 藉由進行冷卻水的運動量高的核沸騰冷卻，可避免此問 題。由於若自噴嘴噴射具有高運動量的冷卻水，噴射的冷 卻水即貫通排水的液膜，到達鋼板表面，可能進一步破壞 18 3 12/發明說明書(補件)/93-08/93116860 200523046 蒸氣膜，故於核沸騰區域進行冷¥卩。由於此狀態的冷卻受 到自噴嘴所喷射的冷卻水左右，故利用自鋼板寬度方向端 面排放的水之冷卻的影響小。為了藉此冷卻水的高運動量 進行核沸騰冷¥卩，可採用提高冷卻水的喷射壓力或增大冷 卻水量密度以提高水的運動量的方法，或採用細縫噴射冷 卻噴嘴等水的運動量高的冷卻噴嘴。 就本發明所用冷卻噴嘴而言，雖然噴灑喷嘴、噴霧噴 嘴、圓管或細縫層流喷嘴、圓管或細縫喷射冷卻噴嘴亦無 妨，不過，在減少水量或水的喷射壓力情形下，以採用水 的運動量高之圓管或細縫喷射冷卻喷嘴較佳。 另一方面，如此使用水運動量高的喷嘴之另一優點，係 於藉遮蔽構件等遮蔽厚鋼板寬度方向的板端部等時，可在 厚鋼板中央部及厚鋼板寬度方向的端部大幅變化冷卻能 力，於極短時間内縮小厚鋼板寬度方向的端部與厚鋼板中 央部的溫度差。由於其自厚鋼板寬度方向的端部排放的水 於厚鋼板的垂直方向不具運動量，故無法打破蒸氣膜的膜 沸騰冷卻。因此，若僅於厚鋼板寬度方向的端部藉遮蔽構 件切斷自厚鋼板的上方或下方所噴射的運動量高的冷卻水 之注水，即可於厚鋼板寬度方向的端部成為冷卻能力低的 膜沸騰，於厚鋼板中央部成為冷卻能力高的核沸騰。因此， 可於厚鋼板寬度方向的端部及厚鋼板中央部增大冷卻能力 差異，可縮小厚鋼板内的溫度分布偏差。甚而，亦消除擴 大溫度分布偏差的過渡沸騰區域之冷卻，可於厚鋼板寬度 方向達到均一冷卻。 19 312/發明說明書(補件)/93-08/93116860 200523046 為實現此種核沸騰區域的控制冷卻，在例如採用細縫噴 射冷卻情形下，可進行水量密度在1 2 0 0 L / m i η · in2以上 的喷射。甚而，若適當地變成在1 5 0 0 L / m i η · in2以上， 即可更穩定地實現核沸騰冷卻，因此較佳。且，根據設備 成本或運轉成本（r u η n i n g c 〇 s t )的觀點，較佳的是水量 密度在3 0 0 0 L / m i η · in2以上。於此，細縫噴射冷卻係指 自具有細縫狀冷卻水噴射口的細縫噴射冷卻噴嘴噴射高速 水流，予以冷卻，其水運動量及冷卻速度較高。利用此細 縫喷射冷卻噴嘴的冷卻裝置稱為細縫噴射冷卻裝置。 綜上所述，首先，在控制冷卻前或控制冷卻初期，使厚 鋼板寬度方向的溫度分布均一化，控制冷卻後的厚鋼板寬 度方向之溫度分布即亦呈均一。進一步藉由採用水運動量 高者作為控制冷卻中的冷卻喷嘴，於核沸騰區域冷卻，即 能以相同冷卻速度冷卻。 又，上述見解係非僅適用於厚鋼板寬度方向的端部，於 厚鋼板之縱長方向之頭尾端部亦適用。 以下使用圖式具體說明本發明。 圖6係本發明第1實施形態的厚鋼板控制冷卻裝置的概 念圖。使用通過型控制冷卻裝置作為控制冷卻裝置2 0 。通過型控制冷卻裝置係於控制冷卻裝置内一面通過厚鋼 板一面冷卻的裝置，由於可進行後述區域控制，故溫度控 制的控制性較停止型控制冷卻裝置優異。其原因在於，例 如，於停止型控制冷卻裝置情形下，雖然在厚鋼板達到指 定溫度時，停止冷卻水的注入，卻有停止時切斷閥的回應 312/發明說明書(補件)/93-08/93116860 20 200523046 遲緩，難以正確地控制水冷時間。此處所示厚鋼板的材料 扁塊藉厚板$昆軋機1軋成指定板厚，成為厚鋼板2，轉送 至輥台3上，藉由通過控制冷卻裝置2 0内的冷卻，以指定 冷卻速度冷卻至冷卻停止溫度。控制冷卻裝置2 0上下夾厚 鋼板2的通過線而配置有上管集箱2 1及下管集箱2 2，於 其上安裝噴出高壓水的細縫噴射冷卻噴嘴2 3、2 4，具有藉 碰撞厚鋼板2表面的極高壓噴出水以急速冷卻厚鋼板的功 能。又，於控制冷卻裝置2 0的入口側及出口側設置溫度計 3 1、3 2，配置成可於控制冷卻前後進行厚鋼板的溫度測定。 又，圖7顯示控制冷卻裝置2 0的詳細圖。控制冷卻裝 置2 0由複數冷卻區構成，各個冷卻區藉除水輥筒2 7隔開， 且可個別調整冷卻水量。此冷卻區自接近輥軋機處起依序 稱為第1區、第2區…。又，做成可通過水量密度在1 2 0 0 L / in i η · m2以上的水的設備，俾使細縫喷射冷卻喷嘴之水 量密度可使熱傳導狀態成為核沸騰，且橫跨厚鋼板的端部 以相同冷卻速度冷卻。 控制冷卻裝置2 0分成前段部2 5及後段部2 6，控制冷卻 裝置前段部2 5於各冷卻區設置遮蔽構件，使成可進行厚鋼 板寬度方向的板端部的冷卻水量調整。如圖7的A A剖面圖 之圖8所示，於上細縫噴射冷卻喷嘴2 3的下部，相當於厚 鋼板寬度方向的兩側端部處，設置有左右一對之上面遮蔽 構件2 8，於下細縫噴射冷卻喷嘴2 4的上部，相當於厚鋼 板寬度方向的兩側端部處，設置有左右一對下面遮蔽構件 2 9，藉由利用橫向行進機構1 6，使其於厚鋼板2的板寬方 312/發明說明書(補件)/93-08/93116860 21 200523046 向進出來進行。上面及下面遮蔽構件2 8、2 9做成可上面部 單獨、下面部單獨或上面部下面部同時等進出的構造。又， 設於控制冷卻裝置2 0前段的遮蔽構件2 8、2 9可於每一水 冷區獨立進出，例如遮蔽構件可僅進入一冷卻區，或遮蔽 構件可進入所有前段冷卻區。 本發明第1實施形態，就第1冷卻步驟而言，於前段冷 卻區一面限制厚鋼板寬度方向兩側端部的冷卻水量，一面 冷卻，在厚鋼板寬度方向的端部與厚鋼板中央部的溫度一 致後，就第2冷卻步驟而言，於後段冷卻區以相同冷卻速 度控制冷卻厚鋼板寬度方向全體。 於此，在限制厚鋼板寬度方向的端部的水量時，根據決 定其遮蔽區數及遮蔽距離的觀點，對冷卻前厚鋼板寬度方 向的端部資訊進行如圖9的定義。於此，溫度下降距離定 義成於厚鋼板寬度方向中，自厚鋼板的溫度梯度為零的位 置至厚鋼板寬度方向的端部之距離，溫度下降量定義成厚 鋼板寬度方向中，厚鋼板的溫度梯度為零的位置之溫度與 厚鋼板寬度方向的端部之溫度的差值。 此溫度下降量或溫度下降距離雖然隨輥軋前材料的板 厚或其加熱條件、報札完成後之厚鋼板的板寬或製品板 厚、輥軋完成的溫度等變化，不過，一般輥軋材的厚鋼板 寬度方向的端部之溫度下降量為40〜50 °C左右，厚鋼板寬 度方向的端部之溫度下降距離為1 0 0〜3 0 0 nin丨左右。厚鋼板 寬度方向的端部之溫度下降量或厚鋼板寬度方向的端部之 溫度下降距離可用輥軋前材料板厚等參數解析實測值，預 22 312/發明說明書(補件)/93-08/931〗6860 200523046 先表格化亦可，於控制冷卻裝置前設置掃描型溫度計等， 俾可測定厚鋼板的全面溫度分布，藉計算機運算其數值以 求得亦無妨。 根據此資訊，於控制冷卻裝置前段，通常在厚鋼板寬度 方向的中央部冷卻，厚鋼板寬度方向的端部藉遮蔽構件限 制冷卻水量，儘量使厚鋼板寬度方向的端部成為接近氣冷 狀態，使厚鋼板中央部及厚鋼板寬度方向的端部之溫度一 致。此第1冷卻步驟將厚鋼板寬度方向的溫度均一化之目 標定在2 0 °C以下，較佳為在1 0 °C以下。 遮蔽構件的移動量可僅遮蔽圖9中厚鋼板寬度方向的端 部之溫度下降距離。又，使用遮蔽構件的冷卻區數一面參 考圖1 0，一面如次決定。 (1 )根據合計控制冷卻裝置前段及後段的冷卻區數為全部 冷卻區數N以及目標冷卻開始溫度與冷卻結束溫度之溫度 差DT (冷卻量），由下式計算每一區的冷卻量△ T。200523046 (1) Description of the invention: [Technical field to which the invention belongs] The present invention relates to an accelerated control cooling system (stee 1 p 1 ate) for hot-rolled thick steel plates and the thickness produced by the controlled cooling method. Steel plate and its cooling device. [Prior art] In the manufacture of thick steel plates, in order to ensure the required mechanical properties of the steel plates, especially strength and toughness, sometimes the thick steel plates after rolling are controlled and cooled at a large cooling rate. After the hot rolling, the controlled cooling system rapidly cools the transformation temperature range from austenite to ferrite. The phase transformation structure is controlled, the crystal structure of the steel is adjusted, and the target mechanical properties are obtained. And other materials. In addition, in order to ensure uniformity of the material thickness of the entire thick steel plate at the same time, and to suppress the occurrence of strain of the thick steel plate after cooling, the entire thick steel plate surface must be uniformly cooled. On the other hand, the four periphery zones of the thick steel plate after cooling are supercooling compared to the central portion of the thick steel plate. The uniform cooling of the entire thick steel plate surface is the actual situation of controlled cooling technology at this stage. To cope with such a requirement, Japanese Patent Laid-Open No. 10-58 0 2 6 discloses a plurality of high-speed high-speed cooling waters that make cooling water at a predetermined angle with respect to the conveyance direction of the steel plate and a predetermined distance from the width direction of the steel plate. Water film, the technology that hits the surface of steel plates. And it proposes that the cooling water after the collision is divided equally between the collision area as a boundary, forming a water flow area along the surface of the steel plate, and the end of the collision area is arranged as a high-temperature steel plate that is cooled from the transportation direction of the steel plate as continuous and non-overlapping. The cooling method. 5 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 In addition, Japanese Patent Laid-Open No. 6 — 1 8 4 6 2 3 (Japanese Patent No. 2 6 9 8 3 0 5) It is proposed to cool the thick steel plate after finishing rolling and rectify the rolling wave. A s 1 itjet cooling nozzle with high cooling capacity provided at the inlet side of the control cooling device obliquely sprays a high-pressure water flow on the thick steel plate to shield the direction. Means of water flow at both ends of the steel plate in the width direction. Further, Japanese Patent Laid-Open No. Sho 6 1-2 1 9 4 1 2 measures the temperature distribution in the width direction of the steel sheet before cooling the rolled hot steel sheet, and calculates the water amount distribution in the width direction of the hot steel sheet based on the measurement results. Next, it is proposed to use the cooled temperature data of the cooled front heat-conducting steel plate right in front of the hot steel plate to correct the calculated water volume distribution, and adjust the width of the water injection volume distribution of the hot steel plate based on the corrected calculated cooling water volume distribution. Uniform cooling method for hot steel plates. In addition, Japanese Patent Laid-Open No. Sho 5 8-3 2 5 1 1 discloses that the cooling water collides with the upper and lower sides of the hot rolled steel plate, and the end of the thick steel plate is shielded by a shield pipe to prevent the cooling water flow on the upper side. A technology that directly hits the end of the thick steel plate and cools the thick steel plate. Furthermore, based on the plate width of the thick steel plate, the amount of cooling water at the top and bottom, and the temperature distribution in the plate width direction of the thick steel plate at the beginning of cooling, the shielded aqueduct that obtains a uniform temperature distribution in the width direction of the thick steel plate at the end of cooling is calculated. Shielding width at the end of the thick steel plate. The feature of the proposal is to control the position of the shielding aqueduct according to the calculation results thus obtained, and to obtain a cooling method for the thick steel plate with the foregoing shielding width. The above-mentioned four Japanese Patent Laid-Open Publications Nos. 10 to 5 8 0 26, Japanese Patent Laid-Open Publication Nos. 6 to 1 8 4 6 2 3 (Japanese Patent Laid-Open No. 2 6 9 8 3 0 5), and Japanese Patent Laid-Open No. 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 6 1 — 2 1 9 4 1 2 and JP-A 5 8 — 3 2 5 1 1 The measures disclosed are to prevent during cooling, A technology that causes a supercooling phenomenon at the end in the width direction of a thick steel plate. Although it is expected that the effect will reach a certain level, there are still problems in uniformly cooling the entire thick steel plate. The technical ideas of these inventions are directed to the supercooling that occurs at the ends in the width direction of the thick steel plate before and / or during cooling. During cooling, only the cooling rate at the ends in the width direction of the steel plate is slowed down, so that the Technology for uniform temperature distribution in the width direction of thick steel plates. Therefore, according to these proposals, in order to make the temperature distribution in the plate surface of the thick steel plate uniform, it is necessary to sacrifice a certain degree of cooling rate and become a bottleneck for improving the material. Furthermore, these proposals cannot ensure the temperature uniformity of the top and tail end of the intermediate rolled material during rolling, and there is a possibility that strain may occur after cooling. In addition, as described later, it is difficult to control the cooling rate of the end portion of a thick steel plate because the change in the heat conduction mode during cooling such as film boiling or transition boiling is not considered. Or the specific conditions such as the cooling start temperature, the cooling end temperature, and the amount of cooling water cannot be adjusted when the cooling conditions change. Since there is no specific description in this regard, actual operation is difficult. Also, Japanese Patent Laid-Open No. Sho 6 1-1 5 9 2 6 discloses a method in which hot steel plates are rolled from top to bottom with a plurality of rolls and water flow cooling is performed. The technology of setting a shut-off valve that can control the opening and closing time at the upper and / or lower headers. It is further proposed that the detection features of the passing position of the hot steel plate and the temperature distribution of the longitudinal direction of the hot steel plate before cooling starts and the cooling operation control are provided. 7 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 Means, the opening and closing control is equivalent to a method for cooling a hot steel plate in which a front end portion and / or a rear end portion of the hot steel plate passes through a shut-off valve of a header in a position where the hot steel plate passes. However, in Japanese Patent Laid-Open No. Sho 6 1-1 5 9 2 6, although the technology for preventing the supercooling of the thick steel plate at the head and tail ends in the longitudinal direction during cooling is proposed, such proposals are not possible. Means to ensure temperature uniformity at the center of the width direction of the rolled material, and to avoid strain after cooling or residual stress at the end of the steel sheet. Further, Japanese Patent Laid-Open No. 1 1-2 6 7 7 3 7 discloses a method for manufacturing a steel sheet by controlling cooling of a hot-rolled high-temperature steel sheet and manufacturing a steel sheet. And the proposed feature is to use a cooling device installed between the roughing mill (r oughingmi 1 1) and the finishing mill (finishing mi 1 1) to perform cooling with a temperature distribution along the width of the thick steel plate. The amount of temperature drop near the plate end of the thick steel plate that occurs until the end of rolling and the amount of temperature drop near the plate end that is estimated to occur during finish rolling are performed under uniform cooling conditions in the width direction of the thick steel plate after finish rolling. Manufacturing method of controlled cooling thick steel plate. However, Japanese Patent Laid-Open No. 1 1-2 6 7 7 3 7 implements temperature compensation of the end portion of the thick steel plate in the early stage before finishing rolling. However, it is difficult to predict the width of the thick steel plate at the end of finishing rolling. The temperature distribution will reach a uniform temperature distribution before finishing rolling. In addition to the cooling caused by the radiation and natural convection of the end of the thick steel plate from the upper and lower directions of the thick steel plate and the side of the thick steel plate during rolling, it also occurs to control the shape or surface of the thick steel plate during rolling. In the state, cooling by waterjet descaling is likely to cause deviations in temperature distribution at the ends in the width direction of the thick steel plate or at the ends of the thick steel plate. In particular, rust removal is based on 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046. The operator judges the use or non-use situation while watching the status of the thick steel plate. It is difficult to control the temperature distribution at the end of rough rolling. The temperature distribution at the end of finishing rolling was made uniform with good reproducibility. In addition, a specific method for uniformizing the temperature distribution in the width direction of the thick steel plate has not been suggested in the controlled cooling, which is difficult to achieve. In addition, Japanese Patent Laid-Open No. 2000-1—1 3 7 9 4 3 proposes a metal that is characterized by heating a wide end edge portion of a metal plate after hot rolling is completed, and then water-cooling and / or heat-correcting the metal. Method for controlling the flatness of the board. However, in Japanese Patent Laid-Open No. 2000-1—1 3 7 9 4 3, in the case of heating by a burner, a large-capacity burner must be used because of the poor heating efficiency, which increases the heating cost. There is a problem that the surface properties of the heated portion of the thick steel plate are oxidized and damaged. Since the equipment cost and heating cost become very high in the case of induction heating, it is not practical. Since the temperature distribution in the width direction of the thick steel plate is not uniformed by any device before cooling, it is not suggested to cool the temperature distribution in the width direction of the thick steel plate. Therefore, as described above, The device caused boiling or the supercooling caused by the increase in the amount of water at the end of the thick steel plate caused by the stagnant water on the steel plate from the end of the tribe. [Summary of the Invention] The problem of the present invention is to solve the problems of the above-mentioned conventional technology. It is proposed that the temperature in the plate surface can be distributed in the width direction of the thick steel plate, and A method for controlling cooling of a thick steel plate that is uniform throughout the entire area in the long direction and has a large cooling rate as a whole, and a thick steel plate and a device manufactured by the controlled cooling method. We also provide the width of the thick steel plate 9 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 Residual stress in the longitudinal direction of the thick steel plate (residual st res; the cloth is uniform, and no strip bending will occur) A method for cooling thick steel plates with processing shapes such as cymbal, plates and devices manufactured by using the controlled cooling method. That is, the present invention is a method for cooling thick steel plates, which completes the method for controlling cooling of hot thick steel plates. : The first cooling step is to uniformize the temperature distribution in the width direction of the thick steel plate and cool it on one side; and the cooling step is to control the width of the thick steel plate at the same cooling rate after uniformizing the temperature distribution in the width direction of the thick steel plate. In addition, the present invention is a method for controlling the cooling of hot-rolled thick steel plates. The aforementioned first cooling step is to use one or more inlet-side cooling zones of a through-type cooling device having a plurality of independent cooling zones, while limiting the thickness in the direction of two The amount of cooling water at the side end is cooled on one side; the second cooling step is the subsequent cooling zone by using one or more of the above-mentioned inlet-side cooling zones. However, the speed control cools the entire width direction of the thick steel plate. In addition, in the present invention, in order to complete the controlled cooling method of the hot-rolled thick steel plate, the first cooling step is to use a pre-cooling device to limit the cooling of the ends on both sides in the direction of thick steel The amount of water is cooled on one side. The second cooling step is a through-type control cooling device with a plurality of independent cooling devices provided at the rear of the preliminary cooling device, and controls the entire cooling thickness in the width direction at the same cooling rate. In the method, a shielding member (in asking in ember) provided on the width of the thick steel plate is used to control the cooling method of the thick steel plate whose cooling water amount is limited at both ends of the width of the steel plate. 312 / Invention Specification (Supplement) / 93 -08/93116860;) The second end body is divided on the side of bad thick steel rolling. Wherein, the width of the control plate is gradually reduced, but the plate width is reduced, but the steel plate is in the end direction. 10 200523046 In addition, the present invention is based on the above method. Controlled cooling method for thick steel plate with cooling water. Further, the present invention is a method for controlling a thick steel plate that restricts the amount of cooling water in the head and tail end portions of the thick steel plate in the longitudinal direction of the pre-cooling device, the pre-cooling device, and the control cooling device. In addition, the present invention is based on the above method, by using a water quantity control device for a specified time by using a signal at the head and tail end portion of the thick steel plate in the longitudinal direction to perform a cooling water amount restriction on the head and tail end portion of the thick steel plate in the longitudinal direction. Control the cooling method. Furthermore, the present invention relates to the method described above, in which the front section of the control cooling device is provided with a shielding member in each section, and the shielding member is provided at the end of the thick steel plate in the width direction of the thick steel plate which can limit the amount of water in the end of the thick steel plate. Controlled cooling method for thick steel plates that can independently shield the cooling water in the width direction end of the thick steel plates in each zone and above and below. In addition, the present invention is in the above method, and has a means for measuring and controlling the temperature distribution in the width direction of the thick steel plate before cooling, and based on the measured temperature distribution, analyzes the amount of temperature drop at the end in the width direction of the thick steel plate and the thickness with which the temperature drop occurs. The distance between the ends in the width direction of the steel plate, based on the results, calculates the shielding amount of the shielding member and the number of cooling zones that are provided in each cooling zone in the front section of the control cooling device, and controls the cooling of the thick steel plate of the shielding member according to the calculation result. method. In addition, the present invention is based on the above method, and measures the temperature distribution of the thickness of the thick steel plate before pre-cooling 11 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 degree direction, and analyzes the width direction end of the thick steel plate from the measured temperature distribution. According to the result, the amount of temperature drop and the distance from the width-wise end of the thick steel plate where the temperature drop occurs are calculated based on the amount of shielding and the cooling time of the shielding member in the preliminary cooling device. Controlled cooling method for thick steel plates. The present invention relates to a thick steel plate manufactured by hot-rolling and controlled cooling by the above-mentioned controlled cooling method. In addition, the present invention is a control cooling device for thick steel plates, which is a through-type control cooling device having a plurality of independent cold air cooling zones. Each cooling zone can perform cooling water volume density of 12001iter (hereinafter referred to as L) / πι: ίη · ηι2 (L / min • m2), and the front cooling zone is provided with shielding members that limit the amount of cooling water at the ends on both sides in the width direction of the thick steel plate. In addition, the present invention is a control cooling device for a thick steel plate, which is a cooling device in which a pre-cooling device and a control cooling device are sequentially arranged behind a rolling mill. The input water density of the pre-cooling device is 500 L (not shown in 1 iter) / n] i η · m2 or less, and shielding members are provided to limit the amount of cooling water at both ends of the thick steel plate in the width direction, and the aforementioned control cooling device is a through type device having a plurality of independent cooling zones, and each cooling zone can perform The cooling water volume density is 1 200 0 L / mi η · in2 or more. Further, the present invention is a control cooling device for a thick steel plate that controls the operation of the shielding member to uniformize the temperature distribution in the width direction of the thick steel plate in the above-mentioned device. In addition, the present invention is in the above-mentioned device, and has a thickness control means for activating a specified amount of water using a pass signal at the head and tail ends in the longitudinal direction of the thick steel plate 12 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 Controlled cooling device for steel plate. Further, the present invention is the above-mentioned device, wherein the control cooling device uses a slit cooling (s 1 i t j e)) cooling nozzle (η ο z z 1 e) thick steel plate control cooling device. The present invention relates to the above device. The pre-cooling device uses a laminar flow (1 ni n a r f 10 w) cooling nozzle, and the control cooling device uses a slit cooling cooling nozzle for a thick steel plate. In addition, the present invention relates to the above-mentioned device, and the shielding member provided in the cooling section for controlling the front section of the cooling device may be independent of each cooling zone and each upper and lower surface, and a structure for shielding cooling water in the widthwise end portion of the thick steel plate. Controlled cooling device for thick steel plates. Further, the present invention is in the above-mentioned device, and has a means for measuring and controlling the temperature distribution in the width direction of the thick steel plate before cooling, and analyzing the temperature drop amount at the end in the width direction of the thick steel plate and the thickness from the temperature drop based on the measured temperature distribution. Means for measuring the distance between the end portions in the width direction of the steel plate, and calculating the shielding amount of the shielding member provided in each cooling zone in the front section of the cooling device and the number of cooling zones for shielding based on the result, and controlling the shielding based on the calculation result The structure of the component is a thick steel plate controlled cooling device. Further, the present invention is a device for measuring the temperature distribution in the width direction of a thick steel plate before pre-cooling, and analyzing the temperature drop in the width direction end of the thick steel plate, and the thickness of the steel plate with which the temperature drop occurs, based on the measured temperature distribution. Means for the distance between the ends in the width direction, and means for calculating the shielding amount and cooling time of the shielding member of the preliminary cooling device based on the result, and control of the shielding in the preliminary cooling device based on the calculation result. 13 312 / Description of the Invention (Supplement) / 93-08 / 93116860 200523046 The cooling device for the thick steel plate of the shielding member and the mechanism of the plate speed. Further, the present invention resides in the above-mentioned device, and a control cooling device of a thick steel plate is provided between the control cooling device or the preliminary cooling device and the control cooling device. [Embodiment] The technical idea of the present invention will be described with reference to a conventional method. In the conventional method, that is, the overcooling prevention method of the plate end in the width direction of a thick steel plate, the temperature of the thick steel plate changes over time. In the conventional method, the temperature at the end of the plate in the width direction of the thick steel plate is lower than that of the thick steel plate before the control. By controlling the cooling thereafter, the shielding member is placed on the plate end portion in the direction of the thick steel plate, or the amount of cooling water is adjusted to reduce the amount of cooling water covering the plate end portion in the direction of the thick steel plate, and the cooling rate is reduced to make the thicker central portion lower. . This is a technique for uniformizing the temperature in the width direction end of the thick steel plate and the center of the thick steel plate at the end of cooling. This problem is described below. Since the cooling rate of the end portion of the thick steel plate in the width direction is lower than that of the thick steel plate, the same material cannot be obtained at the end portion of the thick steel plate in the width direction as in the thick steel plate. Here, the phenomenon of four periphery zones of the thick steel plate can be considered to occur through the following three mechanisms. (1) If air cooling during rolling is used to make thick steel plates through the general roll process, during the rolling stage, air is cooled (air cooling) from the top and bottom of the thick steel plate at the thick surrounding area. Air cooling (air cooling) from the side of the thick steel plate, the degree is lower than that of the center of the thick steel plate. In addition, even before controlling the cooling of such thick steel 312 / Invention Specification (Supplement) / 93-08 / 93116860, the bridge is as shown in Figure 3. Only the side of the central cooling board is wide and the width of the steel plate is too cold. The temperature of the steel plate is about 14 200523046. In the cooling, the thick steel plate is fully cooled with uniform cooling capacity. It is still colder than the center of the thick steel plate around the thick steel plate before cooling, so it is maintained after cooling. Temperature Distribution. (2) Boiling phenomenon caused by water cooling If the thick steel plate is cooled under the temperature distribution deviation in the steel plate before cooling, the temperature distribution deviation will expand. This is explained in detail using FIG. 1. Figure 1 shows the relationship between the surface temperature of a thick steel plate and the heat flux (heatf 1 u X) when cooling high-temperature thick steel plates above 700 ° C (transition of heat flux per unit area and unit time). )). Film boiling (fi 1 mboi 1 ing) when the surface temperature of the thick steel plate is high, and nuclear boiling (nuc 1 eateboi 1 ing) when the surface temperature of the thick steel plate is low, in this intermediate temperature region is transition boiling. . When the surface temperature of the thick steel plate is high, a vapor film (va ρ 〇rfi 1 m) is generated between the thick steel plate surface and the cooling water, thereby the heat conduction in the vapor film is in a state of heat conduction and heat flux. (Cooling capacity) Low. On the other hand, when the surface temperature of the thick steel plate is low, the existing nucleate boiling occurs that the surface of the thick steel plate directly contacts the cooling water, and a vapor bubble (va ρ 〇rbubb 1 e ), A complex phenomenon that disappears by the condensation of the surrounding cooling water. The generation and disappearance of vapor bubbles will cause agitation of the cooling water, resulting in extremely high heat flux (cooling capacity). As shown in Figure 1, in this nucleate boiling and film boiling region, the higher the temperature of the thick steel plate, the higher the heat flux (cooling capacity), and the lower the temperature of the thick steel plate, the heat flux (. Cooling capacity). Therefore, in the case where there is a deviation in the temperature distribution in the steel plate before cooling, the higher the high temperature portion of the thick steel plate, the higher the cooling rate. 312 / Invention Specification (Supplement) / 93-08 / 93116860 15 200523046 The lower temperature portion of the thick steel plate. The lower the cooling rate is, the lower the temperature distribution deviation before cooling is. On the other hand, the surface temperature of the thick steel plate is in a transitional boiling state where film boiling and nucleate boiling are mixed in the intermediate temperature region. The transition boiling state is different from nuclear boiling or film boiling. As the temperature of the thick steel plate decreases, the heat flux (cooling capacity) increases. As the temperature of the thick steel plate is lower, the heat flux (cooling capacity) is higher, and If there is a temperature distribution deviation in the steel plate before cooling, that is, the lower the temperature of the thicker steel plate, the easier it is to cool, so the temperature distribution deviation after cooling increases. If the cooling water volume density is increased, that is, as shown by the dashed line in FIG. 1, the surface temperature Ttf, which shifts from film boiling to nuclear boiling, increases, and transitional boiling begins at the initial stage of cooling. When the density of the cooling water is further increased, the cooling by nuclear boiling may start at the beginning of the cooling. On the other hand, if the cooling water volume density is reduced, the surface temperature T t f which is transferred from film boiling to nucleate boiling is reduced, and the entire film can be boiled during cooling. Since this has not been taken into account in general controlled cooling, most of them are cooled with the cooling water volume density where transition boiling occurs. Therefore, the deviation of the temperature distribution after cooling is mostly enlarged. (3) Drainage caused by thick steel plate In the case where the thick steel plate is cooled horizontally, as shown in Fig. 2, the cooling water flows in the upper direction of the thick steel plate from the end of the plate. Therefore, at the end edge portion A on the thick steel plate, the cooling water sprayed from the nozzle provided on the upper portion of the thick steel plate is added to the cooling water discharged to the end portion of the thick steel plate to cool it. The amount of water is increased, and the cooling rate is increased. Moreover, since the cooling water hitting the thick steel plate quickly fell on the lower side of the thick steel plate, this phenomenon did not occur. Based on the above-mentioned three mechanisms (mec h a n i s m), the temperature of the four-circle portion of the thick steel plate after cooling is lower than that of the central portion of the thick steel plate. Therefore, even if the shape of the steel plate is uniform shortly after cooling, the temperature distribution in the thick steel plate is still uneven, and in the subsequent air cooling process, the heat shrinkage (va 1 ue of heat shrinkage) of the high-temperature thick steel plate is large. The amount of heat shrinkage around the thick steel plate is small, so that residual stress occurs in the thick steel plate, and strain occurs in the thick steel plate. In addition, even if the strain does not occur, the stress remains on the end portion of the thick steel plate. Therefore, if a slitting process is performed at the client end, the so-called warping of the stripe arch occurs around the thick steel plate. In addition, since the periphery of the thick steel plate is cooled to a temperature lower than expected, problems such as a change in the material of the thick steel plate and an increase in strength occur. Therefore, the present invention is constituted by the following two technical ideas. (1) The temperature distribution in the width direction of the thick steel plate is made uniform shortly before the controlled cooling or at the initial stage of the controlled cooling. (2) In the controlled cooling, the cooling is performed at the same cooling rate from the end in the width direction of the thick steel plate to the center of the thick steel plate. The specific description is given using FIG. 4 and FIG. 5. Fig. 4 shows that the temperature distribution in the width direction of the thick steel plate is uniformized at the initial stage of the controlled cooling. After the subsequent controlled cooling, the temperature at the end of the thick steel plate and the central portion of the thick steel plate is uniformly cooled at the same cooling rate over time. In the initial stage of controlled cooling, the present invention controls the amount of water in the widthwise end portion of the thick steel plate using a shield, and usually performs controlled cooling in the central portion of the thick steel plate. After reaching the same temperature at the end in the width direction of the steel plate and at the center of the thick steel plate, from the end of the thick steel plate width 17 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 to the center of the thick steel plate Chill ¥ 卩 at the same cooling rate. In this procedure, the cooling rate and cooling stop temperature of the end portion in the width direction of the steel plate and the center portion of the steel plate are the same, so the material in the width direction of the steel plate is uniform. Fig. 5 shows that before the controlled cooling, the temperature distribution in the width direction of the thick steel plate is uniformized by a pre-cooling device, and the cooling in the width direction of the thick steel plate at the end and the center of the thick steel plate are cooled at the same cooling rate by subsequent cooling control The temperature changes over time. In this case, during the controlled cooling, the cooling rate of the end portion in the width direction of the thick steel plate and the central portion of the thick steel plate also match, so the same effect as that of Fig. 4 described above can be obtained. Next, in a controlled cooling device, nuclear boiling cooling is performed in order to cool the thick steel plate in the width direction at the same cooling rate. According to Fig. 1, although the surface temperature of the medium-thick steel plate after cooling becomes a transition boiling region, the deviation of the temperature distribution after cooling will increase. However, in the nuclear boiling region, the higher the temperature, the higher the cooling capacity (higher heat flux). Even if there is a deviation in the temperature distribution before cooling, the difference is still reduced, which can reduce the difference in cooling capacity between the end portion of the thick steel plate and the central portion of the thick steel plate. If, as in this case, the temperature distribution in the thick steel plate before cooling is uniform, there is no temperature distribution deviation in the thick steel plate originally, so in principle, there may be no temperature distribution deviation after cooling. In addition, FIG. 2 illustrates that since the cooling water sprayed from the nozzle provided in the upper part of the thick steel plate on the end of the thick steel plate is cooled by the cooling water discharged to the end of the thick steel plate, the amount of water is increased and the cooling rate is changed. Big. In contrast, this problem can be avoided by performing nuclear boiling cooling with a high amount of cooling water movement. If cooling water with a high amount of motion is sprayed from the nozzle, the sprayed cooling water is a liquid film that penetrates the drainage and reaches the surface of the steel plate, which may further damage the 18 3 12 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 vapor film, So cold in the nucleate boiling area. Since the cooling in this state is affected by the cooling water sprayed from the nozzle, the influence of cooling by the water discharged from the end surface in the width direction of the steel plate is small. In order to carry out nucleate boiling using this high amount of cooling water, the method of increasing the spray pressure of cooling water or increasing the density of the cooling water volume to increase the amount of water movement, or using a slit spray cooling nozzle with a high amount of water movement, can be adopted. Cool the nozzle. As for the cooling nozzle used in the present invention, although a spray nozzle, a spray nozzle, a round pipe or a slit laminar flow nozzle, a round pipe or a slit jet cooling nozzle is not a problem, in the case of reducing the amount of water or the spray pressure of water, It is preferred to use a circular tube or a slit-jet cooling nozzle with a high amount of water movement. On the other hand, another advantage of using a nozzle with a high amount of water movement in this way is that when the end portion of the thick steel plate is shielded by a shielding member or the like, the center portion of the thick steel plate and the end portion in the width direction of the thick steel plate can be greatly changed. The cooling capacity reduces the temperature difference between the end portion of the thick steel plate and the center portion of the thick steel plate in a very short time. Since the water discharged from the end in the width direction of the thick steel plate has no movement in the vertical direction of the thick steel plate, it cannot break the film boiling cooling of the vapor film. Therefore, if the injection of cooling water with a high amount of motion sprayed from above or below the thick steel plate is cut off by the shielding member only at the end portion of the thick steel plate in the width direction, the cooling capacity at the end portion in the width direction of the steel plate becomes low. The film is boiled and becomes a nuclear boil with high cooling ability in the center of the thick steel plate. Therefore, the difference in cooling capacity can be increased at the end portion in the width direction of the thick steel plate and at the center portion of the thick steel plate, and the variation in temperature distribution in the thick steel plate can be reduced. Furthermore, the cooling in the transition boiling region, which enlarges the deviation of the temperature distribution, is eliminated, and uniform cooling can be achieved in the width direction of the thick steel plate. 19 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 In order to achieve such controlled cooling of the nuclear boiling zone, in the case of, for example, the use of fine slit cooling, the water volume density can be 1 2 0 0 L / mi η · In2 and above. Furthermore, if it is appropriately set to 15 00 L / m i η · in2 or more, nuclear boiling cooling can be achieved more stably, so it is preferable. In addition, from the viewpoint of equipment cost or running cost (r u η n i n g c 0 s t), it is preferable that the water volume density is 3 000 L / m i η · in 2 or more. Here, the slit spray cooling refers to spraying a high-speed water flow from a slit spray cooling nozzle having a slit-shaped cooling water spray port for cooling, and its water movement amount and cooling rate are high. The cooling device using this slit-jet cooling nozzle is called a slit-jet cooling device. In summary, first, before controlling cooling or controlling the initial cooling period, the temperature distribution in the width direction of the thick steel plate is uniformized, and the temperature distribution in the width direction of the thick steel plate after cooling is also uniform. Furthermore, by using the higher water movement amount as the cooling nozzle in the controlled cooling, and cooling in the nuclear boiling region, it can be cooled at the same cooling rate. The above-mentioned insights are applicable not only to the ends in the width direction of the thick steel plate, but also to the ends in the longitudinal direction of the thick steel plate. Hereinafter, the present invention will be specifically described using drawings. Fig. 6 is a conceptual diagram of a thick steel plate controlled cooling device according to the first embodiment of the present invention. A through-type control cooling device is used as the control cooling device 20. The pass-through type control cooling device is a device that cools the thick cooling plate while passing through a thick steel plate in the control cooling device. Since the zone control described later can be performed, the controllability of the temperature control is better than that of the stop-type control cooling device. The reason is that, for example, in the case of a stop-type control cooling device, although the injection of cooling water is stopped when the thick steel plate reaches a specified temperature, there is a response of the shut-off valve at the stop 312 / Invention Specification (Supplement) / 93- 08/93116860 20 200523046 Slow, it is difficult to properly control the water cooling time. The material flat block of the thick steel plate shown here is rolled to a specified thickness by the thick plate $ Kun mill 1 to become the thick steel plate 2 and transferred to the roll table 3, and the specified cooling is performed by controlling the cooling in the cooling device 20 Speed cools to cooling stop temperature. An upper pipe header 2 1 and a lower pipe header 2 2 are arranged on the passing line for controlling the cooling device 20 to sandwich the upper and lower thick steel plates 2, and a slit spray cooling nozzle 2 3, 2 4 that sprays high-pressure water is installed on the The function of rapidly cooling the thick steel plate by ejecting water against the surface of the thick steel plate 2 with extreme pressure. In addition, thermometers 3 1 and 3 2 are provided at the inlet side and the outlet side of the control cooling device 20, and are arranged so that the temperature of the thick steel plate can be measured before and after the control cooling. FIG. 7 shows a detailed view of the control cooling device 20. The control cooling device 20 is composed of a plurality of cooling zones, and each cooling zone is separated by a dewatering roller 27, and the cooling water amount can be adjusted individually. This cooling zone is called zone 1 and zone 2 in order from the point where the rolling mill is approached. In addition, a device capable of passing water with a water volume density of 1 200 L / in i η · m2 or more is made, and the water volume density of the cooling nozzle of the fine-slit jet can be used to make the heat conduction state nucleate and cross the thick steel plate. The ends are cooled at the same cooling rate. The control cooling device 20 is divided into a front section 25 and a rear section 26, and the front section 25 of the control cooling device is provided with a shielding member in each cooling zone so that the cooling water amount of the end portion of the thick steel plate can be adjusted. As shown in FIG. 8 in the AA cross-sectional view of FIG. 7, a pair of left and right upper shielding members 28 are provided at the lower portions of the upper slit jet cooling nozzles 23 corresponding to the two sides of the thick steel plate in the width direction. A pair of left and right lower shielding members 29 are provided on the upper part of the lower slit spray cooling nozzle 24 at the ends corresponding to both sides in the width direction of the thick steel plate. The board width of 312 / Invention Specification (Supplement) / 93-08 / 93116860 21 200523046 of 2 goes in and out. The upper and lower shielding members 2 8 and 2 9 have a structure in which the upper face alone, the lower face alone or the upper face and lower face can be simultaneously entered and exited. In addition, the shielding members 28, 29 provided in the front section of the control cooling device 20 can be independently entered and exited in each water-cooling zone. For example, the shielding members can enter only one cooling zone, or the shielding members can enter all the front-stage cooling zones. According to the first embodiment of the present invention, in the first cooling step, the amount of cooling water at the ends of both sides of the thick steel plate in the cooling zone at the front stage is restricted, and the cooling is performed at the end of the thick steel plate in the width direction and the center of the thick steel plate. After the temperature is consistent, in the second cooling step, the entire width of the thick steel plate is controlled to be cooled in the subsequent cooling zone at the same cooling rate. Here, when restricting the amount of water at the end in the width direction of the thick steel plate, the end information in the width direction of the thick steel plate before cooling is defined as shown in Fig. 9 from the viewpoint of determining the number of shielding areas and the shielding distance. Here, the temperature drop distance is defined as the distance from the position where the temperature gradient of the thick steel plate is zero to the end in the width direction of the thick steel plate, and the amount of temperature drop is defined as the The difference between the temperature at the position where the temperature gradient is zero and the temperature at the end in the width direction of the steel plate. Although this temperature drop amount or temperature drop distance varies with the thickness of the material before rolling or its heating conditions, the width of the thick steel plate after the completion of the report, the thickness of the product, and the temperature at which the rolling is completed, etc., it is generally rolled. The amount of temperature drop at the ends in the width direction of the thick steel plate is about 40 to 50 ° C, and the temperature drop distance at the ends in the width direction of the thick steel plate is about 100 to 300 nin. The amount of temperature drop at the end of the plate width direction or the temperature drop distance of the end of the plate width direction can be measured using parameters such as the thickness of the material before rolling. Pre-22 312 / Invention Manual (Supplement) / 93-08 / 931〗 6860 200523046 It is also possible to form a table first, and set a scanning thermometer before controlling the cooling device. 俾 The overall temperature distribution of the thick steel plate can be measured. It can be obtained by computing the value by a computer. According to this information, in the front section of the control cooling device, cooling is usually performed at the central portion in the width direction of the thick steel plate. The end portion in the width direction of the thick steel plate is limited by the shielding member to reduce the amount of cooling water. The temperatures of the central portion of the steel plate and the end portion in the width direction of the steel plate were made uniform. In this first cooling step, the goal of uniformizing the temperature in the width direction of the thick steel plate is set below 20 ° C, preferably below 10 ° C. The moving amount of the shielding member can shield only the temperature drop distance of the end portion in the width direction of the thick steel plate in FIG. 9. The number of cooling zones using the shielding member is determined in the same manner as shown in FIG. 10 while referring to FIG. 10. (1) According to the total control of the number of cooling zones in the front and rear sections of the cooling device is the total number of cooling zones N and the temperature difference DT (cooling amount) between the target cooling start temperature and the cooling end temperature, the cooling amount of each zone is calculated by the following formula △ T.

Δ T = DT / N (2 )根據每一區的冷卻量△ T，求出只要以冷卻前厚鋼板 寬度方向的端部之溫度下降量ED即可達到厚鋼板中央部 的冷卻之冷卻區數η。 n = E D / △ Τ (3 )根據控制冷卻裝置前段的首區之第1區使用於（2 )所 求得冷卻區數的遮蔽構件。 此時算出的冷卻區數雖然未必是整數，不過，由於本發 明可單獨以上面部遮蔽構件或單獨以下面部遮蔽構件遮 蔽，故認為能以0 . 5區單位控制。例如在算出冷卻區數為 23 312/發明說明書(補件)/93-08/93 η 6860 200523046 1.4等情形下，可使用1.5區，具體而言，於第1區使用 上下面部二遮蔽構件，於第2區僅使用上面部遮蔽構件即 可。於此，儘量縮短各冷卻區的設備長度，使冷卻區數越 多，厚鋼板寬度方向的端部之溫度控制性越提高。 又，可藉遮蔽構件大致切斷冷卻水，使厚鋼板寬度方向 的端部接近氣冷條件為佳。其隨著厚鋼板寬度方向端部的 溫度接近厚鋼板中央部的溫度，厚鋼板中央部及厚鋼板寬 度方向的端部之溫度分布均一化所需時間增長，遮蔽構件 的使用區數亦變多。其結果，由於控制冷卻裝置後段側的 冷卻量減少，故難以獲得本發明效果之厚鋼板寬度方向的 端部與厚鋼板中央部的冷卻速度一致的優點。 圖1 1就本發明例子以顯示藉由前述方法實施冷卻情形 的冷卻前後厚鋼板寬度方向之溫度分布。條件定為使用板 厚30 mm、板寬3200 mm、板長25m的厚鋼板，於厚鋼板的 寬度中央部，自7 5 0 °C起開始控制冷卻，於5 5 0 °C完成冷 卻。冷卻前之厚鋼板，其厚鋼板寬度方向端部之溫度下降 量為30 °C ，厚鋼板寬度方向端部之溫度下降距離為 2 0 0mm。又，本發明實施例所用冷卻裝置雖係前述構造，不 過，冷卻區數為10區，上下喷嘴均喷射1800 L/min· m2 之冷卻水量密度。由於藉由前述方法求算遮蔽構件的使用 區數，結果得出1 . 5區，故於第1區使用上下面部二遮蔽 構件，於第2區僅使用上面部遮蔽構件。由於遮蔽構件的 移動量係厚鋼板寬度方向的端部之溫度下降距離為200 mm，故僅移動遮蔽構件2 0 0丽至遮蔽厚鋼板寬度方向的端 24 312/發明說明書(補件)/93-08/93116860 200523046 部之位置。本發明於可使冷卻前達到3 0 °C的厚鋼板寬度方 向的端部之溫度下降大致消失。另一方面”亦試就不使用 遮蔽構件的情形實施，以資比較，可知冷卻後厚鋼板寬度 方向的端部之溫度下降量變成6 0 °C，厚鋼板寬度方向之溫 度分布偏差擴大。 又，於前段冷卻區，在厚鋼板縱長方向的頭尾端部的冷 卻中，一面限制冷卻水量，一面冷卻，於厚鋼板縱長方向 的頭尾端部與厚鋼板中央部的溫度一致後，在後段冷卻 區，以相同冷卻速度對厚鋼板縱長方向全體進行冷卻。 與先前就厚鋼板板寬方向的端部所說明者相同的方法 亦可適用於此。為了進行此厚鋼板縱長方向的頭尾端部的 冷卻控制，於圖6及圖7的控制冷卻裝置，如圖1 2所示， 例如藉光電管1 7檢測控制冷卻區的厚鋼板2前端通過情 形，以光電管1 7所檢出厚鋼板前端通過時間為基準，設定 定時器（t i m e r ) T，其使由流量計及流量調整閥構成的流 量控制裝置4 1在進入上述分割的冷卻區時刻（t i in i n g ) 開始作動。又，就流量控制裝置之其他方法而言，亦可為 如圖1 3所示，於控制冷卻裝置的前段部設置三向閥4 2， 藉由冷卻水於厚鋼板的頭尾端部逸出外部，可停止自喷嘴 喷射冷卻水之構造。 首先，在限制厚鋼板頭尾端部的水量時，根據決定其遮 蔽區數及遮蔽距離的觀點，對冷卻前厚鋼板頭尾端部資訊 進行如圖14的定義。厚鋼板頭尾端部之溫度下降量或溫度 下降距離之定義與圖9中厚鋼板板寬方向的端部之定義相 25 312/發明說明書(補件)/93-08/93116860 200523046 同。此溫度下降量或溫度下降距離，雖然隨輥軋前材料的 板厚或其加熱條件、輥軋完成後的板寬或製品板厚、輥軋 完成的溫度等變化，不過，一般輥軋材的厚鋼板頭尾端部 之溫度下降量為4 0〜5 0 °C左右，厚鋼板頭尾端部之溫度下 降距離為3 0 0〜5 0 0 mm左右。厚鋼板頭尾端部之溫度下降量 或厚鋼板頭尾端部之溫度下降距離，可用輥軋前材料板厚 等參數解析實測值，預先表格化亦可，於控制冷卻裝置前 設置掃描型溫度計或定點溫度計等表面溫度計，俾可測定 厚鋼板縱長方向之溫度分布，藉計算機運算其數值以求得 亦無妨。 根據此資訊，於控制冷卻裝置前段，通常在厚鋼板縱長 方向的中央部冷卻，厚鋼板縱長方向的頭尾端部藉流量控 制裝置4 1限制冷卻水量，使儘量成接近氣冷狀態，使厚鋼 板縱長方向的中央部及厚鋼板縱長方向的頭尾端部之溫度 一致。其亦可適用與厚鋼板寬度方向的遮蔽構件使用相同 的構想。例如，為了補償厚鋼板縱長方向前端部之溫度下 降部的溫度，可如圖1 5所示，首先於控制冷卻裝置2 0的 各冷卻管集箱成停止冷卻水的狀態（圖1 5 A的狀態），將定 時器設定成於厚鋼板前端部的溫度下降部及厚鋼板中央部 之交界進入各冷卻區的時刻，使流量控制裝置4 1作動，喷 射冷卻水（圖1 5 B的狀態）。 又，為了補償厚鋼板縱長方向尾端部的溫度下降部之溫 度，可如圖1 6所示，首先於控制冷卻裝置2 0的各冷卻管 集箱成冷卻水通水的狀態（圖1 6 A的狀態），將定時器設定 312/發明說明書(補件)/93-08/93116860 26 200523046 成於厚鋼板縱長方向尾端部的溫度下降部及厚鋼板縱長方 向中央部之交界進入各冷卻區的時刻，使流量控制裝置4 1 作動，停止冷卻水（圖1 6 B的狀態）。 又，使作動流量控制裝置4 1的冷卻區數如同厚鋼板寬 度方向的控制法，如次決定。 (1 )根據合計控制冷卻裝置前段及後段的冷卻區數為全部 冷卻區數N以及目標冷卻開始溫度與冷卻結束溫度之溫度 差DT (冷卻量），由下式計算每一區的冷卻量△ T。Δ T = DT / N (2) Based on the cooling amount of each zone △ T, find the number of cooling zones that can achieve the cooling of the center of the thick steel plate as long as the temperature drop ED at the end in the width direction of the thick steel plate before cooling η. n = E D / △ Τ (3) According to the first zone of the first zone of the front section of the control cooling device, it is used as a shielding member for the number of cooling zones obtained in (2). Although the number of cooling zones calculated at this time is not necessarily an integer, it is considered that the present invention can be controlled in units of 0.5 zones because it can be shielded by the above face shielding members alone or below the face shielding members alone. For example, in the case where the number of cooling zones is 23 312 / Invention Specification (Supplement) / 93-08 / 93 η 6860 200523046 1.4, etc., the 1.5 zone can be used. Specifically, the upper and lower face two shielding members are used in the first zone. In the second zone, only the upper face shielding member can be used. Here, the equipment length of each cooling zone is shortened as much as possible, and the larger the number of cooling zones is, the higher the temperature controllability of the end portion in the width direction of the thick steel plate is. In addition, it is preferable that the cooling water is substantially cut off by the shielding member so that the end portion in the width direction of the thick steel plate is brought close to the air-cooled condition. As the temperature at the widthwise end of the thick steel plate approaches the temperature of the center of the thick steel plate, the time required for uniformizing the temperature distribution of the thickness of the center of the thick steel plate and the widthwise end of the steel plate increases, and the number of use areas of the shielding member increases . As a result, since the amount of cooling on the rear side of the control cooling device is reduced, it is difficult to obtain the advantage that the cooling speed of the end portion in the width direction of the thick steel plate and the central portion of the thick steel plate are the same. Fig. 11 is an example of the present invention to show the temperature distribution in the width direction of the thick steel plate before and after cooling in the case where the cooling is performed by the aforementioned method. The conditions are set to use a thick steel plate with a thickness of 30 mm, a width of 3200 mm, and a length of 25 m. At the center of the width of the thick steel plate, controlled cooling is started from 750 ° C, and cooling is completed at 550 ° C. Before cooling the thick steel plate, the temperature drop at the width end of the thick steel plate is 30 ° C, and the temperature drop at the width end of the thick steel plate is 200 mm. In addition, although the cooling device used in the embodiment of the present invention has the aforementioned structure, the number of cooling zones is 10, and the upper and lower nozzles each spray a cooling water volume density of 1800 L / min · m2. Since the number of using areas of the shielding member is calculated by the foregoing method, and the result is 1.5 areas, the upper and lower face two shielding members are used in the first area, and only the upper face shielding members are used in the second area. Since the moving amount of the shielding member is the temperature drop distance of the end portion in the width direction of the thick steel plate is 200 mm, only the shielding member is moved from 200 ° to the end in the width direction of the thick steel plate 24 312 / Invention Specification (Supplement) / 93 -08/93116860 200523046. In the present invention, the temperature drop at the end in the width direction of the thick steel plate that can reach 30 ° C before cooling is almost eliminated. On the other hand, it is also tried to implement without using a shielding member. Based on comparison, it can be seen that after cooling, the temperature drop at the end in the width direction of the thick steel plate becomes 60 ° C, and the temperature distribution deviation in the width direction of the thick steel plate increases. In the front cooling zone, in the cooling of the head and tail ends of the thick steel plate in the longitudinal direction, the amount of cooling water is limited while cooling. After the temperature of the head and tail ends of the thick steel plate in the longitudinal direction and the center of the steel plate are consistent, In the rear cooling zone, the entire longitudinal direction of the thick steel plate is cooled at the same cooling rate. The same method as described previously for the end portion of the thick steel plate in the width direction can also be applied here. The cooling control of the head and tail ends is shown in FIG. 12 and the control cooling device shown in FIG. 12. For example, the front end of the thick steel plate 2 in the control cooling zone is detected by the photocell 17 and the phototube 17 is used to detect the passage. The front end of the thick steel plate passes through time as a reference, and a timer T is set, which allows the flow control device 41 composed of a flow meter and a flow adjustment valve to enter the divided cooling zone Ti in ing started to operate. As for other methods of the flow control device, as shown in FIG. 13, a three-way valve 4 2 is provided at the front part of the control cooling device, and the cooling water is used to The structure where the head and tail end of the thick steel plate escapes from the outside and can stop spraying cooling water from the nozzle. First, when limiting the amount of water at the head and tail end of the thick steel plate, from the viewpoint of determining the number of shielding areas and the distance, The information of the head and tail end of the thick steel plate is defined as shown in Figure 14. The definition of the temperature drop amount or temperature drop distance of the head and tail end of the thick steel plate is in accordance with the definition of the width direction end of the thick steel plate in Figure 9 25 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 Same. The amount of temperature drop or the distance of temperature drop, although it depends on the thickness of the material before rolling or its heating conditions, the width of the plate after rolling, or the thickness of the product, and rolling. The finished temperature and other changes, however, the temperature drop of the head and tail end of the thick steel plate is generally about 40 ~ 50 ° C, and the temperature drop of the head and tail end of the thick steel plate is 3 0 0 ~ 5 0 About 0 mm. Temperature at the end of the thick steel plate The degree of decrease or the temperature drop distance of the head and tail end of the thick steel plate can be analyzed with measured values such as the thickness of the material before rolling, and can be pre-formed. A surface thermometer such as a scanning thermometer or a fixed-point thermometer can be set before the cooling device is controlled.俾 The temperature distribution in the longitudinal direction of the thick steel plate can be measured, and the value can be obtained by computing the value by a computer. According to this information, in the front section of the control cooling device, it is usually cooled in the center of the longitudinal direction of the thick steel plate, and the longitudinal direction of the thick steel plate. The flow rate control device 41 limits the amount of cooling water to make it as close to the air-cooled state as possible, so that the temperature of the central portion of the longitudinal direction of the thick steel plate and the end of the longitudinal direction of the thick steel plate are the same. The same concept as the use of the shielding member in the width direction of the thick steel plate is applicable. For example, in order to compensate the temperature of the temperature drop portion of the front end portion of the thick steel plate in the longitudinal direction, as shown in FIG. 15, the cooling water in the cooling pipe 20 of the cooling device 20 is first controlled to stop the cooling water (FIG. 15 A State), the timer is set to the time when the temperature drop portion of the front end of the heavy steel plate and the center of the thick steel plate enter each cooling zone, and the flow control device 41 is activated to spray cooling water (state of FIG. 15B ). In addition, in order to compensate the temperature of the temperature drop portion at the tail end in the longitudinal direction of the thick steel plate, as shown in FIG. 16, firstly, each cooling pipe header of the cooling device 20 is controlled to form a cooling water flow state (FIG. 1). 6 A state), the timer setting 312 / Invention Manual (Supplement) / 93-08 / 93116860 26 200523046 is formed at the junction between the temperature drop section at the tail end in the longitudinal direction of the thick steel plate and the center section in the longitudinal direction of the thick steel plate. When entering each cooling zone, the flow control device 41 is activated to stop the cooling water (state of FIG. 16B). The number of cooling zones of the operating flow control device 41 is determined in the same manner as the control method in the width direction of the thick steel plate. (1) According to the total control of the number of cooling zones in the front and rear sections of the cooling device is the total number of cooling zones N and the temperature difference DT (cooling amount) between the target cooling start temperature and the cooling end temperature, the cooling amount of each zone is calculated by the following formula △ T.

△ T = DT / N (2 )根據每一區的冷卻量△ T，求出只要以冷卻前厚鋼板 前端或厚鋼板尾端部之溫度下降量EDL即可達到厚鋼板縱 長方向中央部的冷卻之冷卻區數nL。 nL=EDL/ △丁 (3 )根據控制冷卻裝置前段的首區之第1區使用於（2 )所 求得冷卻區數nL的流量控制裝置。 此時算出的冷卻區數雖然未必是整數，不過，在例如算 出冷卻區數為1 . 4等情形下，使用接近整數的1區分。這 與厚鋼板寬度方向的控制不同，若例如僅喷射冷卻水於厚 鋼板上面，則有因發生於厚鋼板上下面的溫度差而於厚鋼 板出現翹曲的危險性，由於此種厚鋼板縱長方向的頭尾端 的翹曲難以藉由於後實施的滾子橋平機（r ο 1 1 e r 1 e v e 1 e r ) 等的矯正步驟矯正，故不佳。此際，如同厚鋼板寬度方向 的情形，亦沿厚鋼板縱長方向，儘量縮短各冷卻區的設備 長度，使冷卻區數越多，厚鋼板縱長方向的頭尾端部之溫 度控制性越提高。又，可於厚鋼板縱長方向的頭尾端部大 27 312/發明說明書(補件)/93-08/93116860 200523046 致切斷冷卻水，使接近氣冷條件為佳。這與厚鋼板板寬方 向的控制相同，其隨著厚鋼板縱長方向的頭尾端部之溫度 接近厚鋼板縱長方向中央部之溫度，厚鋼板縱長方向中央 部及厚鋼板縱長方向的頭尾端部之溫度分布均一化所需時 間增長，實施流量調整的水冷區數亦變多。其結果，由於 控制冷卻裝置後段側的冷卻量減少，故難以獲得本發明效 果之厚鋼板縱長方向的頭尾端部與厚鋼板縱長方向中央部 的冷卻速度一致的優點。 由於上述厚鋼板縱長方向的頭尾端部之溫度下降部可 進行與厚鋼板寬度方向的端部相同之冷卻控制，故無庸贅 言地，可橫跨厚鋼板縱長方向全長冷卻成均一溫度。 又，就本方式的優點而言，由於控制遮蔽構件的使用區 數，俾消除厚鋼板寬度方向之溫度下降，控制進行厚鋼板 縱長方向的頭尾端的水流量控制之冷卻區數，俾消除厚鋼 板縱長方向的頭尾端之溫度下降，故可獨立控制厚鋼板寬 度方向及厚鋼板縱長方向的頭尾端。因此，即使例如厚鋼 板寬度方向的端部之溫度下降量為3 0 °C，厚鋼板縱長方向 的頭尾端部之溫度下降量為7 0 °C ，溫度下降量不同，仍可 達到溫度分布的均一化。 圖1 7係本發明第2實施形態的厚鋼板控制冷卻裝置之 概念圖。熱軋厚鋼板2依序轉送至輥台3上，朝預備冷卻 裝置1 0、控制冷卻裝置2 0運送，以指定冷卻速度冷卻至 冷卻停止溫度。 預備冷卻裝置1 0係為達成本發明第1冷卻步驟而設於 28 312/發明說明書(補件)/93-08/93 η 6860 200523046 控制冷卻裝置前的冷卻裝置，具有能冷卻至少厚鋼板寬度 方向的端部之溫度下降量為4 0 °C〜5 0 °C左右的能力。於 此，在預備冷卻裝置1 0，上下夾厚鋼板2的通過線（p a s s 1 i n e )而配置上管集箱1 1及下管集箱1 2，配置成水流1 3、 1 4可自設於此等管集箱的喷嘴（未圖示）喷到厚鋼板2的 表背面，進行層流冷卻。且，層流冷卻係利用水流遲滯時 產生的層流，於厚鋼板的表面形成水膜而冷卻的方法，其 冷卻速度較小。利用層流冷卻的冷卻裝置稱為層流冷卻裝 置。 控制冷卻裝置2 0如同本發明第1實施形態，上下夾厚 鋼板2的通過線而配置上管集箱21及下管集箱22，於其 上安裝喷出高壓水的細縫噴射冷卻噴嘴2 3、2 4，具有藉碰 撞厚鋼板2表面的極高壓喷出水以急速冷卻厚鋼板的功 能。控制冷卻裝置2 0進一步如圖7所示，由複數冷卻區構 成，各冷卻區藉除水輥筒2 7 (未圖示）隔開，且可個別調 整冷卻水量密度。此冷卻區自接近輥軋機之處起依序稱為 第1區、第2區…。又，做成可進行1200 L/min.m2以 上的通水的設備，俾能以厚鋼板端部均一的冷卻速度冷卻。 又，於預備冷卻裝置的入口側及控制冷卻裝置的入口側 和出口側設置表面溫度計3 0、3 1、3 2，可進行冷卻前後的 厚鋼板之溫度側定。 本發明第2實施形態併用具有此等層流冷卻裝置的預備 冷卻裝置1 0及具有細縫噴射冷卻喷嘴冷卻裝置的控制冷 卻裝置2 0。此際，於具有層流冷卻裝置的預備冷卻裝置 29 312/發明說明書(補件)/93-08/93116860 200523046 中，進行厚鋼板2寬度方向的兩側端部及厚鋼板頭尾端部 的冷卻水量控制。 厚鋼板寬度方向的冷卻水量調整藉由如圖18以圖17的 A A剖面圖所示，於預備冷卻裝置1 0，在上管集箱1 1的下 部及下管集箱1 2的上部相當於厚鋼板寬度方向兩側端部 處所，設置左右一對遮蔽構件1 5，藉橫向行進機構1 6使 其於厚鋼板2寬度方向進出來進行。 本發明第2實施形態將第1實施形態控制冷卻裝置前段 的功能替換成預備冷卻裝置1 0，藉由於預備冷卻裝置1 0 中橫跨設備全長安裝遮蔽構件，確實進行厚鋼板寬度方向 之溫度分布的均一化。其係接著，藉後續控制冷卻裝置 20，以自厚鋼板寬度方向的端部至厚鋼板寬度方向中央部 以相同的冷卻速度冷卻之技術。如本發明第1實施形態所 說明，由於厚鋼板板寬方向的端部之溫度下降量為40 °C〜 50 °C左右，故為了使厚鋼板板寬方向之溫度分布均一，可 不冷卻厚鋼板板寬方向的端部，僅將厚鋼板寬度方向中央 部冷卻4 0 °C〜5 0 °C即可。目標冷卻量極少，故冷卻速度減 慢且較長時間的冷卻亦容易控制，由於可實現高精度冷 卻，故第2實施形態的方法可較第1實施形態更加提高厚 鋼板板寬方向之溫度分布的均一性。由於本方法的可冷卻 4 0 °C〜5 0 °C左右的設備位於控制冷卻裝置前即可，故亦可 以極低廉成本設置。又，就控制方法而言，可如同先前說 明的第1實施形態，於預備冷卻裝置的前段實施遮蔽構件 1 5的使用區，雖然遮蔽構件1 5的使用區數等亦可於冷卻 30 312/發明說明書(補件)/93-08/93116860 200523046 裝置全長使用，不過，若如前者，於預備冷卻裝置的前段 使用遮蔽構件，則厚鋼板端部藉由在預備冷卻裝置後段冷 卻而開始其後控制冷卻之溫度較後者低。因此，較佳的是 如後者於冷卻裝置全長使用遮蔽構件，變化通板速度，實 施冷卻。 於此，在限制板端部的水量時，根據決定其冷卻時間及 遮蔽距離的觀點，對預備冷卻前的板端部資訊進行如第1 實施形態中圖9所說明之定義。由於其亦如第1實施形態， 此溫度下降量或溫度下降距離隨輥軋前材料的板厚或其加 熱條件、輥軋完成後的板寬或製品板厚、輥軋完成的溫度 等變化，故可解析實測值，預先表格化，於控制冷卻裝置 前設置掃描型溫度計等表面溫度計，俾可測定厚鋼板全面 的溫度分布，藉計算機運算其數值以求得亦無妨。 根據此資訊，於預備冷卻裝置中，通常在厚鋼板寬度方 向的中央部冷卻，厚鋼板寬度方向的板端部藉遮蔽構件限 制冷卻水量，使儘量成接近氣冷狀態，使厚鋼板寬度方向 中央部及厚鋼板寬度方向的端部之溫度一致。遮蔽構件的 移動量可僅遮蔽圖9中厚鋼板寬度方向的板端部之溫度下 降距離。又，可算出藉預備冷卻裝置1 0僅冷卻冷卻前的厚 鋼板板寬方向端部之溫度下降量分所需冷卻時間，根據設 備長度及其冷卻時間決定通板速度，可較第1實施形態更 簡單計算。又異於第1實施形態，因並非為〇. 5區單位的 冷卻區數控制，而可連續的控制冷卻時間故可提高厚鋼板 板寬方向之溫度分布的均一性。 31 312/發明說明書(補件)/93-08/93116860 200523046 又，預備冷卻裝置的冷卻水量密度以保持在1 ο 0 L/ min· m2以上500 L/min· m2以下的範圍為佳。茲如於解 決問題之手段處所述，說明為了以均一冷卻速度冷卻厚鋼 板寬度方向全面，可防止自厚鋼板板寬方向的端部排水所 造成的過冷，因此，可採用運動量高的冷卻形式（具體而 言，使用1 2 0 0 L / m in · m2以上的細縫喷射型冷卻噴嘴）。 因此，雖無法使此預備冷卻裝置可自厚鋼板寬度方向的端 部至厚鋼板寬度方向中央部成為相同冷卻速度，不過，畢 竟厚鋼板寬度方向的端部之溫度下降量為40〜50 °C，非常 小，且可於不決定材質的高溫區域均一其控制冷卻前的厚 鋼板寬度方向之溫度，故應用存在於低水量且表面溫度高 狀態的圖1之膜沸騰區域之熱傳導特性。由於在具有冷卻 前厚鋼板寬度方向之溫度分布偏差狀態下，於圖1的過渡 沸騰區域，厚鋼板的表面溫度越低，冷卻能力（熱通量） 越高，故雖然例如於諸如厚鋼板寬度方向的端部冷卻前溫 度低的區域冷卻能力（熱通量）呈加速度地增高，卻因於 膜沸騰區域，越是溫度高的區域，冷卻能力（熱通量）變 得越高，故冷卻前厚鋼板寬度方向之溫度分布偏差不會擴 大。因此，若控制成可於預備冷卻裝置中藉由膜沸騰冷卻， 即可防止沸騰狀態變化所造成厚鋼板板端部的過冷。因 此，可僅考慮厚鋼板板端部的排水所造成之過冷，可較容 易達到厚鋼板寬度方向的的溫度分布的均一化。又由於膜 沸騰的冷卻能力（熱通量）低，故亦有可控制性極佳地控 制厚鋼板板端部的溫度下降量為2 0〜3 0 °C的冷卻之優 32 312/發明說明書(補件)/93-08/93116860 200523046 點。就實現此構想的設備而言，若預備冷卻裝置1 0的冷卻 水量密度在100 L / ni in· m2以上，500 L / min· m2以下， 即可實現穩定的膜沸騰。又，為了實現膜沸騰，須於厚鋼 板與冷卻水之間存在蒸氣膜，其以採用噴灑冷卻或噴霧冷 卻、層流冷卻等水運動量低者為佳。 另一方面，厚鋼板頭尾端部的冷卻水量調整如同於第1 實施形態所說明，藉由於厚鋼板縱長方向的頭尾端部通過 之際切斷（c u t ◦ f f )水流來進行。具體而言，如圖1 9所 示般進行。亦即，分割出層流冷卻裝置1 0的上管集箱1 1 (圖1 9的例子分割出1 1 a〜1 1 d四個），另一方面，例如藉 光電管1 7檢測厚鋼板2的縱長方向前端通過層流冷卻裝置 1 0情形。然後，以光電管1 7所檢出厚鋼板縱長方向的前 端通過時間為基準，使上述分割的上管集箱開始作動般設 定定時器T 1〜T 4。藉此，對應圖1 9的厚鋼板行進階段， 上管集箱1 1作動，緩和厚鋼板縱長方向的前端部之水冷。 利用定時器定出的冷卻水噴射時刻與第1實施形態相同， 可根據預先求出或在預備冷卻前測定的厚鋼板縱長方向的 前端部之溫度下降長度，進行與第1實施形態所說明相同 的控制即可。厚鋼板縱長方向的尾端部之冷卻水量調整與 上述相同，可如圖2 0所示進行即可。 厚鋼板縱長方向的頭尾端部之冷卻控制可藉由與本發 明第1實施形態相同的方法如此進行。 另一方面，於如上述厚鋼板縱長方向.的頭尾端部切斷冷 卻水的情形，進行與設置遮蔽構件於厚鋼板板寬方向的板 33 312/發明說明書(補件)/93-08/93〗16860 200523046 端部以限制 在厚鋼板板 尾端部相同 在控制冷卻 置的縱長全 即無法獨立 故僅能使厚 溫度分布的 就使厚鋼 布二者均一 備冷卻裝置 鋼板寬度方 冷卻裝置均 的控制冷卻 長方向的頭 者方法有無 卻時間的連 精度溫度分 至厚鋼板縱 鋼板頭尾端 下降量大之 須與溫度下 一化厚鋼板 制冷卻。然 冷卻水量並 寬方向之溫 之溫度下降 前為均一， 長，限制厚 控制厚鋼板 鋼板寬度方 其中一方均 板寬度方向 化的方法而 設置複數冷 向的板端部 一化厚鋼板 裝置中，實 尾端部之控 法藉由預備 續調整，無 布均一化的 長方向之溫 部之溫度下 情形下，厚 降量大的頭 寬度方向之 而，由材質 僅冷卻板寬 度下降量係 量情形下， 不過，於第 鋼板板寬方 的寬度方向 向之溫度分 一化。 之溫度分布 言，有如同 卻區，在預 之冷卻水量 寬度方向的 施於第1實 制冷卻的方 冷卻裝置的 法完全獲益 缺點。又， 度分布之均 降量較厚鋼 鋼板板寬方 尾端部一致 溫度分布情 上的觀點， 方向中央部 與厚鋼板縱 儘管可使於 2實施形態 向的端部之 及厚鋼板的 布或厚鋼板 及縱長方向 第1實施形 備冷卻裝置 控制的方法 溫度分布’ 施形態說明 法，而以後 冷卻區數控 於厚鋼板寬 在藉預備冷 一化情形下 板寬度方向 向及縱長方 冷卻。因此 形，須自更 期望控制冷 相同之事。 長方向的頭 厚鋼板全面 預備冷卻裝 冷卻水量， 縱長方向， 頭尾端部之 之溫度分 態，亦於預 前段進行厚 ，或藉預備 於後續進行 的厚鋼板縱 者較佳。前 制以進行冷 度方向的高 卻裝置進行 ，例如在厚 端部之溫度 向的中央部 ，相較於均 -低溫度起控 卻開始溫度 312/發明說明書(補件)/93-08/93116860 34 200523046 以自高溫起實施的情形居多，若自低溫起控制冷卻，即有 控制冷卻前發生肥粒鐵相變，淬火性降低之虞。又，大多 重視厚鋼板寬度方向的端部之溫度分布均一性。因此，較 佳的是如後者方法般，首先藉由預備冷卻，使寬度方向均 一化，藉由爾後的控制冷卻，使厚鋼板縱長方向之溫度分 布均一化的方法。 以上本發明雖說明第1實施形態的方法及第2實施形態 的方法，不過，可符合採用此等方法的製造線或製品特點， 實施任一個或二者。例如由材質的觀點，於冷卻初期無法 預備冷卻情形下，或在無導入預備冷卻裝置的空間之情形 下，可採用第1實施形態，在欲使厚鋼板寬度方向之材質 均一性較厚鋼板縱長方向高之情形下，或在具有預備冷卻 裝置及控制冷卻裝置本來就成直線排列的設備情形下，可 採用第2實施形態。 可進一步於實施形態1中，在控制冷卻裝置2 0前設置 矯正機3 0。又，於實施形態2中，可如圖21所示，將矯 正機3 0設置在前述預備冷卻裝置1 0與控制冷卻裝置2 0 之間。在冷卻前厚鋼板的平坦度不佳情形下，溫度均一會 因喷嘴與厚鋼板間的距離隨厚鋼板的各位置變化而發生若 干惡化。因此，若於控制冷卻前進行厚鋼板的形狀矯正， 即可更均一實施控制冷卻，容易達到製品鋼板之材質均一 性或平坦度的確保。又，矯正機3 0可進一步設置於控制冷 卻裝置2 0後面側。 且本發明所用遮蔽構件係對厚鋼板寬度方向的端部遮 35 312/發明說明書(補件)/93-08/93116860 200523046 去供自噴嘴的水之構件，可為塊狀（b 1 〇 c k t y p e )、 導水管狀（canaliculated type)(彎曲）等任何形 於經常承受高壓水，故較佳的是由财腐姓性材料構 性大之構造。且從遮蔽構件的製成及處理的適合性 最佳的是板狀。在採用遮蔽板情形下，其大小可較 的最大溫度下降距離呈略長之構造。若較其短，即 端部之溫度下降距離長情形下無法覆蓋，相反地，另 則遮蔽板的橫向行進機構會過大，例如，安裝遮蔽 制冷卻裝置内般狹窄空間，其本身就有困難。如前 般板端部之溫度下降距離最大為3 0 0腦左右，故可 mm至4 0 0 _左右的長度。又，就其材質而言，由於 線所用冷卻水中大多含有氣等腐蝕物質，故較佳的 不銹鋼等不易腐蝕的材料，或使用表面防蝕塗裝或 鉻等之碳鋼板等。 (實施例） 表1表示依照本發明進行控制冷卻的情形及藉由 法（比較例）進行控制冷卻的情形之作業條件，表 其效果對比情形。就處理鋼板的條件而言，使用板 誦、板寬3 8 0 0 _、板長2 5 m的鋼板，於厚鋼板板寬 部自7 5 0 °C起開始控制冷卻，於5 5 0 °C結束冷卻。厚 強度等級為490 MPa級，其容許範圍為490 〜610△ T = DT / N (2) According to the cooling amount of each zone △ T, the temperature reduction amount EDL at the front end or the tail end of the thick steel plate before cooling can be used to reach the central portion of the thick steel plate in the longitudinal direction. Cooling zone number nL. nL = EDL / △ D (3) According to the first zone of the first zone of the front section of the control cooling device, it is used in the flow control device for the number of cooling zones nL obtained in (2). Although the number of cooling zones calculated at this time is not necessarily an integer, when, for example, the number of cooling zones is calculated to be 1.4, a division close to an integer is used. This is different from the control in the width direction of the thick steel plate. For example, if only cooling water is sprayed on the upper surface of the thick steel plate, there is a risk that the thick steel plate will warp due to the temperature difference between the upper and lower surfaces of the thick steel plate. The warpage of the head and tail ends in the long direction is difficult to be corrected by a correction step such as a roller bridge leveler (r ο 1 1 er 1 eve 1 er) performed later, so it is not good. At this time, as in the width direction of the thick steel plate, the length of the equipment in each cooling zone is also shortened as much as possible along the longitudinal direction of the thick steel plate. The more the number of cooling zones, the greater the temperature controllability of the head and tail ends of the thick steel plate in the longitudinal direction. improve. In addition, the head and tail end portions of the thick steel plate in the longitudinal direction can be made larger. 27 312 / Invention Manual (Supplement) / 93-08 / 93116860 200523046 The cooling water can be cut off to make it close to the air cooling condition. This is the same as the control of the width direction of the thick steel plate. As the temperature of the head and tail ends in the lengthwise direction of the thick steel plate approaches the temperature of the center portion of the lengthwise direction of the steel plate, the center portion of the lengthwise direction of the steel plate and the lengthwise direction of the steel plate The time required to uniformize the temperature distribution at the head and tail ends increases, and the number of water-cooled zones for which flow rate adjustment is performed also increases. As a result, since the amount of cooling on the rear side of the control cooling device is reduced, it is difficult to obtain the advantage that the cooling rate of the head and tail ends in the longitudinal direction of the thick steel plate and the central portion in the longitudinal direction of the thick steel plate are the same. Since the temperature decreasing portion of the head and tail ends in the longitudinal direction of the thick steel plate can perform the same cooling control as the ends in the width direction of the thick steel plate, it is needless to say that it can be cooled to a uniform temperature across the entire length of the thick steel plate. In addition, in terms of the advantages of this method, since the number of use areas of the shielding member is controlled, the temperature drop in the width direction of the thick steel plate is eliminated, and the number of cooling zones for controlling the water flow rate at the head and tail ends in the lengthwise direction of the thick steel plate is eliminated. The temperature of the head and tail ends of the thick steel plate in the longitudinal direction decreases, so the width and thickness of the steel plate can be independently controlled. Therefore, even if, for example, the temperature drop at the end in the width direction of the thick steel plate is 30 ° C, and the temperature drop at the head and tail end in the lengthwise direction of the steel plate is 70 ° C, the temperature can still reach the temperature. Uniform distribution. Fig. 17 is a conceptual diagram of a thick steel plate controlled cooling device according to a second embodiment of the present invention. The hot-rolled thick steel plate 2 is sequentially transferred to the roll table 3, and is conveyed to the pre-cooling device 10 and the control cooling device 20, and is cooled to a cooling stop temperature at a specified cooling rate. The preliminary cooling device 10 is provided at 28 312 / Invention Specification (Supplement) / 93-08 / 93 η 6860 200523046 to achieve the first cooling step of the invention. The cooling device before the control cooling device has a width capable of cooling at least the thickness of the thick steel plate. The temperature drop at the end of the direction is about 40 ° C ~ 50 ° C. Here, in the pre-cooling device 10, the upper pipe header 1 1 and the lower pipe header 1 2 are arranged in the pass 1 ine of the upper and lower thick steel plates 2 and the water flows 1 3, 1 4 can be set. The nozzles (not shown) of these headers are sprayed onto the front and back surfaces of the thick steel plate 2 to perform laminar cooling. In addition, laminar cooling is a method in which a laminar flow generated when a water flow lags is used to form a water film on the surface of a thick steel plate for cooling, and the cooling rate is small. A cooling device using laminar cooling is called a laminar cooling device. The control cooling device 20 is the same as the first embodiment of the present invention. The upper tube header 21 and the lower tube header 22 are arranged on the passing line of the upper and lower thick steel plates 2, and a slit-jet cooling nozzle 2 that sprays high-pressure water is installed on the upper tube header 21. 3, 2 and 4 have the function of rapidly cooling the thick steel plate by spraying water at the extremely high pressure of the surface of the thick steel plate 2. The control cooling device 20 is further shown in FIG. 7 and is composed of a plurality of cooling zones. Each cooling zone is separated by a dewatering roller 27 (not shown), and the cooling water volume density can be adjusted individually. This cooling zone is called zone 1 and zone 2 in sequence from the point where it is close to the rolling mill. In addition, a device capable of passing water at a rate of 1200 L / min.m2 or more was made, and the slag could be cooled at a uniform cooling rate at the end of the thick steel plate. In addition, surface thermometers 30, 31, and 32 are provided on the inlet side of the preliminary cooling device and on the inlet and outlet sides of the control cooling device, so that the temperature of the thick steel plate before and after cooling can be determined. According to the second embodiment of the present invention, a preliminary cooling device 10 having such a laminar flow cooling device and a control cooling device 20 having a slit-jet cooling nozzle cooling device are used in combination. At this time, in the preliminary cooling device 29 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 having a laminar flow cooling device, the two side ends of the thick steel plate 2 and the ends of the thick steel plate Cooling water control. The amount of cooling water in the width direction of the thick steel plate is adjusted as shown in FIG. 18 and FIG. 17 along the AA cross section. In the preliminary cooling device 10, the lower part of the upper header 11 and the lower part of the lower header 12 are equivalent. A pair of left and right shielding members 15 are provided at the end portions on both sides of the thick steel plate in the width direction, and the lateral travel mechanism 16 is used to advance in and out of the thick steel plate 2 in the width direction. In the second embodiment of the present invention, the function of the first stage of the control cooling device of the first embodiment is replaced by the pre-cooling device 10. Since the shielding member is installed across the entire length of the equipment in the pre-cooling device 10, the temperature distribution in the width direction of the thick steel plate is reliably performed. Homogenization. This is a technique in which the cooling device 20 is subsequently controlled to cool from the end in the width direction of the thick steel plate to the center in the width direction of the thick steel plate at the same cooling rate. As explained in the first embodiment of the present invention, since the temperature drop of the end portion in the width direction of the thick steel plate is about 40 ° C to 50 ° C, in order to make the temperature distribution in the width direction of the thick steel plate uniform, the thick steel plate may not be cooled. It is sufficient to cool the central part in the width direction of the steel plate by 40 ° C to 50 ° C at the end in the width direction. The target cooling amount is very small, so the cooling rate is slow and the cooling for a long time is easy to control. Since high-precision cooling can be achieved, the method of the second embodiment can increase the temperature distribution in the width direction of the thick steel plate compared to the first embodiment. Uniformity. Since the device that can cool around 40 ° C ~ 50 ° C in this method can be located in front of the control cooling device, it can also be set at a very low cost. As for the control method, as in the first embodiment described previously, the use area of the shielding member 15 can be implemented at the front stage of the preliminary cooling device, although the number of use areas of the shielding member 15 can also be cooled at 30 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 The full length of the device is used. However, if the shielding member is used in the front section of the pre-cooling device as in the former, the end of the thick steel plate is started by cooling in the back section of the pre-cooling device. The controlled cooling temperature is lower than the latter. Therefore, it is preferable to use a shielding member over the entire length of the cooling device to change the speed of the plate passing through to cool it. Here, when limiting the amount of water at the end of the plate, from the viewpoint of determining the cooling time and the shielding distance, the information on the end of the plate before preliminary cooling is defined as described in FIG. 9 in the first embodiment. Since it is also the same as the first embodiment, the temperature drop amount or temperature drop distance varies with the thickness of the material before rolling or its heating conditions, the width of the plate after rolling, the thickness of the product, and the temperature at which rolling is completed. Therefore, the actual measured value can be analyzed and pre-formulated. A surface thermometer such as a scanning thermometer is set before the cooling device is controlled. The overall temperature distribution of the thick steel plate can be measured. It can be obtained by computing its value with a computer. According to this information, in the pre-cooling device, cooling is usually performed at the central portion in the width direction of the thick steel plate, and the end portion of the plate in the width direction of the thick steel plate is restricted by the shielding member so that the amount of cooling water is as close as possible to the air-cooled state. The temperature of the portion and the end portion in the width direction of the steel plate are the same. The moving amount of the shielding member can shield only the temperature drop distance of the plate end portion in the width direction of the thick steel plate in FIG. 9. In addition, it is possible to calculate the required cooling time by using the pre-cooling device 10 to cool only the temperature drop at the end of the thick steel plate in the width direction before cooling, and determine the plate passing speed based on the equipment length and its cooling time, which can be compared with the first embodiment. Simpler calculations. It is also different from the first embodiment in that the cooling zone number is not controlled in 0.5 zone units, and the cooling time can be continuously controlled, so that the uniformity of the temperature distribution in the width direction of the thick steel plate can be improved. 31 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 It is preferable that the cooling water volume density of the preliminary cooling device is maintained within a range of 1 ο 0 L / min · m2 or more and 500 L / min · m2 or less. As described in the means to solve the problem, it is explained that in order to cool the entire width of the thick steel plate at a uniform cooling rate, it can prevent overcooling caused by drainage from the end in the width direction of the thick steel plate. Therefore, cooling with a high amount of movement can be used. Type (Specifically, a slit-type cooling nozzle with a diameter of 12 00 L / min or more) is used. Therefore, although this preliminary cooling device cannot achieve the same cooling rate from the end portion of the thick steel plate to the center portion of the thick steel plate in the width direction, the temperature drop of the end portion of the thick steel plate in the width direction is 40 to 50 ° C. It is very small and can uniformly control the temperature in the width direction of the thick steel plate before cooling in the high-temperature region where the material is not determined. Therefore, the heat conduction characteristics of the film boiling region of Fig. 1 existing in a state of low water volume and high surface temperature are applied. Since the temperature distribution in the width direction of the thick steel plate before cooling is in the transition boiling region in FIG. 1, the lower the surface temperature of the thick steel plate is, the higher the cooling capacity (heat flux) is. The cooling capacity (heat flux) of the area where the temperature is low before cooling in the direction increases rapidly, but because the film boiling area, the higher the temperature area, the higher the cooling capacity (heat flux), so the cooling The temperature distribution deviation in the width direction of the front thick steel plate will not increase. Therefore, if it is controlled so that it can be cooled by film boiling in the pre-cooling device, it is possible to prevent overcooling of the end portion of the thick steel plate caused by the change in the boiling state. Therefore, only the supercooling caused by the drainage of the end portion of the thick steel plate can be considered, and the temperature distribution in the width direction of the thick steel plate can be easily uniformized. And because the film boiling has a low cooling capacity (heat flux), it also has excellent controllability. It can control the temperature drop of the end of the thick steel plate at 20 ~ 30 ° C. Excellent cooling 32 312 / Invention Manual (Supplement) / 93-08 / 93116860 200523046 points. As far as the equipment to realize this idea is concerned, if the cooling water volume density of the pre-cooling device 10 is 100 L / ni in · m2 or more and 500 L / min · m2 or less, stable film boiling can be achieved. In addition, in order to achieve film boiling, a vapor film must be present between the thick steel plate and the cooling water, and it is preferred to use spray cooling or spray cooling, laminar cooling, or the like with a low amount of water movement. On the other hand, as described in the first embodiment, the cooling water amount of the head and tail ends of the thick steel plate is adjusted by cutting (c u t ◦ f f) the water flow when the head and tail ends in the longitudinal direction of the thick steel plate pass. Specifically, it proceeds as shown in FIG. 19. That is, the upper tube header 1 1 of the laminar flow cooling device 10 is divided (the example of FIG. 19 is divided into four 1 1 a to 1 1 d). On the other hand, for example, a thick steel plate 2 is detected by using a photo tube 17 In the longitudinal direction, the front end passes through the laminar cooling device 10. Then, the timers T1 to T4 are set based on the passage time in the longitudinal direction of the thick steel plate detected by the photocell 17 to start the divided upper tube header. Thereby, in accordance with the thick steel plate traveling stage of FIG. 19, the upper tube header 11 is operated to alleviate the water cooling of the front end portion of the thick steel plate in the longitudinal direction. The cooling water injection timing determined by the timer is the same as that of the first embodiment, and the temperature decrease length of the front end portion of the thick steel plate in the longitudinal direction of the thick steel plate obtained in advance or measured before pre-cooling can be described with the first embodiment The same controls are sufficient. The adjustment of the amount of cooling water in the longitudinal end portion of the thick steel plate is the same as described above, and it can be performed as shown in FIG. 20. The cooling control of the head and tail ends in the longitudinal direction of the thick steel plate can be performed in the same manner as in the first embodiment of the present invention. On the other hand, in the case where the cooling water is cut at the head and tail ends of the thick steel plate in the longitudinal direction as described above, a plate 33 312 / Invention Specification (Supplement) / 93- 08/93〗 16860 200523046 The end is limited to the end of the thick steel plate. The end of the plate is the same. The length of the cooling unit cannot be controlled independently. Therefore, only the thick temperature can be distributed. The cooling device controls the cooling of the head in the longitudinal direction. The accuracy of the time is divided into the thickness of the steel plate and the longitudinal end of the steel plate. However, before the temperature of the cooling water amount and the temperature in the width direction decreases, the thickness is uniform, long, and the method of limiting the thickness control of the thickness of the thick steel plate to one of the average plate width directions is provided. The control method of the real tail end is prepared by continuous adjustment. In the case of the temperature direction of the long-term temperature section without cloth uniformization, the thickness is reduced only by the width of the head in the direction of the width of the head. In this case, however, the temperature is normalized in the widthwise direction of the first steel plate. The temperature distribution is similar to the cooling zone. The method of applying the first method of cooling in the width direction of the pre-cooling water volume completely benefits the disadvantages. In addition, from the viewpoint that the average drop of the degree distribution is higher than the temperature distribution of the wide square end of the thick steel steel plate, the central portion of the direction and the longitudinal direction of the thick steel plate can be used at the ends of the two embodiments and the thickness of the thick steel plate. Or thick steel plate and longitudinal direction The first implementation of the method of forming a cooling device control method temperature distribution 'method to explain the form, and in the subsequent cooling zone numerically control the thickness of the thick steel plate. In the case of pre-cooling, the plate width direction and lengthwise direction cool down. Therefore, it is necessary to change the expectation of controlling the same thing. The head and thick steel plates in the long direction are fully prepared for cooling. The temperature distribution in the lengthwise direction and the end and end of the head is also thickened in the preliminary stage, or it is better to prepare the thick steel plates in the longitudinal direction. The prefabrication is performed by a high cooling device in the direction of coldness. For example, at the center of the thick end, the starting temperature is 312 / Invention Specification (Supplement) / 93-08 / 93116860 34 200523046 In most cases, it is implemented from high temperature. If the cooling is controlled from low temperature, it is possible to control the phase transformation of iron and fertilizer before cooling, which may reduce the hardenability. In addition, the uniformity of the temperature distribution at the ends in the width direction of the thick steel plate is often emphasized. Therefore, as in the latter method, it is preferable to first uniformize the width direction by preliminary cooling, and then uniformly control the temperature distribution in the longitudinal direction of the thick steel plate by controlling the cooling thereafter. Although the present invention has described the method according to the first embodiment and the method according to the second embodiment, the present invention can be implemented either or both in accordance with the characteristics of a manufacturing line or a product using these methods. For example, from the point of view of the material, in the case where pre-cooling cannot be performed at the initial stage of cooling, or when there is no space for introducing a pre-cooling device, the first embodiment can be adopted. The second embodiment can be adopted when the length is high, or when the pre-cooling device and the control cooling device are arranged in a line. Further, in Embodiment 1, a corrector 30 may be provided before the cooling device 20 is controlled. Further, in the second embodiment, as shown in FIG. 21, the straightening machine 30 may be installed between the preliminary cooling device 10 and the control cooling device 20. In the case where the flatness of the thick steel plate is not good before cooling, the temperature uniformity may be deteriorated due to the change in the distance between the nozzle and the thick steel plate with each position of the thick steel plate. Therefore, if the shape correction of the thick steel plate is performed before the controlled cooling, the controlled cooling can be implemented more uniformly, and it is easy to ensure the material uniformity or flatness of the product steel plate. Further, the corrector 30 may be further provided on the rear side of the control cooling device 20. In addition, the shielding member used in the present invention covers the end portion of the thick steel plate in the width direction. 35 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 The member for supplying water from the nozzle may be a block (b 1 〇cktype ), Canaliculated type (curved), and any other shape that often withstands high pressure water, it is better to construct a structure with a wealthy material. In addition, the shape and the suitability of the shielding member are preferably plate-shaped. In the case of using a shielding plate, the maximum temperature drop distance can be slightly longer. If it is shorter, that is, if the temperature drop at the end is longer, it cannot be covered. Conversely, the lateral travel mechanism of the shielding plate will be too large. For example, it is difficult to install a narrow space like a shielding cooling device. As before, the maximum temperature drop of the end of the plate is about 300 brains, so it can be a length of about mm to about 400 mm. As for the material, since most of the cooling water used in the wire contains corrosive substances such as gas, materials that are not easily corroded, such as stainless steel, or carbon steel plates, such as surface anticorrosive coating or chromium, are preferred. (Example) Table 1 shows the operating conditions of the case where controlled cooling is performed according to the present invention and the case where the controlled cooling is performed by a method (comparative example), and the effects are compared. Regarding the conditions for processing steel plates, a steel plate with a plate width of 3 8 0 0 _ and a plate length of 2 5 m is used. Controlled cooling starts at 7 5 0 ° C at the wide part of the thick steel plate, and at 5 5 0 ° C ends cooling. Thickness grade is 490 MPa, and its allowable range is 490 to 610

冷卻前的厚鋼板係圖9中厚鋼板寬度方向端部之溫 量為3 0 °C ，厚鋼板寬度方向端部之溫度下降距離為 匪。圖1 4中厚鋼板縱長方向頭尾端部之溫度下降I 312/發明說明書(補件)/93-08/93116860 板狀、 狀，由 成的剛 看來， 板端部 會在板 •過長， 板於控 述，一 為350 在製造 是使用 鍍鋅· 習知方 2表示 厚25 的中央 鋼板的 Μ P a ° 度下降 20 0 :為5 0 36 200523046 °C ，厚鋼板縱長方向頭尾端部之溫度下降距離為5 0 0 nim。 且於發明例1及2中，如圖2 5及圖2 6所示，控制冷卻裝 置所用遮蔽構件（下稱遮蔽板）使用於每一冷卻區左右、 上下四個長度300 _父寬度35〇111111父厚度7 111111的鐘211—！^ 鋼板。且為了不使此遮蔽板遮斷的冷卻水再度朝厚鋼板落 下，相對於水平線傾斜1 5 ° 。又，於發明例3及4中，預 備冷卻裝置所用遮蔽構件安裝左右、上下四個鍍Ζ η — N i 鋼板加工成L型的遮蔽構件（長度10 mm x寬度350 mm x厚 度7匪X高度5 0丽）的遮蔽構件，俾可於設備全長（長度 1 0 m )遮蔽冷卻水。且由於在預備冷卻裝置中遮蔽構件的長 度極長，有因遮蔽構件本身重量發生撓曲的危險性，故為 確保遮蔽構件的剛性，如圖2 7所示，施以加工形成L型， 做成隔5 0 0丽間距安裝肋部的構造，如圖2 8所示，以垂直 方向的板朝向寬度方向内的方式安裝。其目的在於遮蔽厚 鋼板端部，避免遮蔽構件所遮斷的冷卻水朝厚鋼板落下。 發明例1係對應實施形態1的實施例。使用圖6至圖8 所說明之裝置實施冷卻。茲使用圖7就控制條件加以詳細 說明。冷卻區數為15區，每一區的設備長度為1.0m，控 制冷卻裝置的全長為15m。又，於各區以1500L / min· m2 的冷卻水量密度喷射，此時的冷卻速度约為3 0 °C / s (秒）。由於自7 5 0 °C起開始冷卻，於5 5 0 °C結束冷卻，故 每一區的冷卻量為（750 °C — 550 °C) /15 區= 13.3 °C。 因此，於厚鋼板寬度方向端部使用遮蔽構件的必要區數成 為30 °C /13.3 °C = 2. 26區。因此，實際使用的區數為2.5 37 312/發明說明書(補件)/93-08/93116860 200523046 區，自第1區至第2區使用上下面，第3區僅使用下面遮 蔽構件。又遮蔽構件移動量即厚鋼板寬度方向的端部之溫 度下降距離為2 0 0 mm，故設定成自厚鋼板寬度方向的端部 起僅可遮蔽2 0 0 mm的冷卻水般。另一方面，如圖1 2所示， 厚鋼板縱長方向的頭尾端方向之流量調整，藉流量控制裝 置實施。厚鋼板縱長方向頭尾端之溫度下降量為5 0 °C，必 要區數為50 °C /13.3 °C = 3. 8區，故自第1至第4區實施。 又，厚鋼板縱長方向前端如圖15所示，首先，如圖15A 所示，於未喷射冷卻水狀態下待機，在進入冷卻裝置僅達 厚鋼板縱長方向前端之溫度下降距離狀態下亦即如圖1 5 B 般喷射冷卻水。厚鋼板縱長方向尾端亦同樣實施圖1 6般控 制。且由於控制冷卻裝置的冷卻速度約為3 (TC / s，故控 制冷卻所需冷卻時間變成（7 5 0 °C — 5 5 0 °C ) / 3 0 °C / s = 6.6sec (秒），控制冷卻裝置的通板速度為（15m / 6.6sec) x 60 = 134mpm (每分米）。 發明例2係對應實施形態1之另一實施例，冷卻水量密 度為1 2 0 0 L / m i η · m2。冷卻水量密度以外的條件與發明 例1相同。 發明例3係對應實施形態2的實施例，使用圖1 7所說 明之裝置，首先，藉預備冷卻裝置1 0冷卻，在均一化厚鋼 板板寬方向之溫度分布偏差後，藉控制冷卻裝置2 0實施冷 卻，均一化厚鋼板縱長方向的頭尾端部之溫度分布偏差。 圖1 7的預備冷卻裝置1 0的設備長度為1· 0 m，能以冷卻水 量密度1 0 0 L / m i η · m2喷射，此時的冷卻速度約為4 °C / 38 312/發明說明書(補件)/93-08/93116860 200523046 s。由於厚鋼板寬度方向的板端部之溫度為720 °C，故自750 °C起將厚鋼板寬度方向的中央部冷卻至7 2 0 °C的時間為 (7 5 0 °C — 7 2 0 °C ) / 4 °C / s = 7 · 5 s e c。因此，預備冷卻裝 置 10 的通板速度成為（10m/7.5sec) x 60=80mpni。 又，如圖19及圖20所示，在厚鋼板縱長方向的頭尾端部 係為僅進入厚鋼板縱長方向的頭尾端部之溫度下降距離 (5 0 0 min )之後，依序喷射冷卻水。又由於遮蔽構件移動 量即厚鋼板寬度方向的板端部之溫度下降距離為200 mm， 故設定成自厚鋼板寬度方向的板端部起僅可遮蔽2 0 0 mm的 冷卻水般。 又，圖1 7的控制冷卻裝置與發明例1相同，冷卻區數 為15區，每一區的設備長度為1.0m，控制冷卻裝置的全 長為15m。又，於各區以1500 L/min· m2的冷卻水量密 度噴射，此時的冷卻速度約為3 0 °C / s。於控制冷卻裝置 2 0，由於自7 2 0 °C起開始冷卻，於5 5 0 °C結束冷卻，故每一 區的冷卻量為（7 2 0 °C — 5 5 0 °C ) / 1 5區=1 1 · 3 °C。厚鋼板 縱長方向的頭尾端部之流量調整係厚鋼板縱長方向的頭尾 端部之溫度下降量雖為50 °C，不過，由於藉預備冷卻裝置 僅消除3 0 °C分的溫度分布偏差，故控制冷卻裝置須控制2 0 °C分的厚鋼板縱長方向的頭尾端部之溫度下降量。為此， 必要區數為2 0 °C / 1 1 . 3 °C = 1 . 8區，故自第1至第2區實 施。又，厚鋼板縱長方向的前端部如圖1 5所示，首先，如 圖1 5 A所示，於未喷射冷卻水狀態下待機，在進入冷卻裝 置僅達厚鋼板縱長方向前端之溫度下降距離狀態下亦即如 39 312/發明說明書(補件)/93-08/93116860 200523046 圖1 5 B般喷射冷卻水。厚鋼板縱長方向的尾端部亦同樣實 施圖1 6般控制。且由於控制冷卻裝置的冷卻速度約為3 0 °C / s，故冷卻時間變成（7 2 (ΓC — 5 5 0 °C ) / 3 0 °C / s = 5.7sec，控制冷卻裝置的通板速度為（15m / 5. 7sec) x 60 =1 5 8 in p m。且，厚鋼板縱長方向的頭尾端部之流量調整藉 如圖1 2的流量調整閥實施。 發明例4係於實施形態2中在預備冷卻裝置與控制冷卻 裝置之間設置矯正機的實施例，冷卻條件與發明例3相同。 比較例1係雖然藉與發明例1相同的設備，以相同通板 速度冷卻，不過，卻不實施用於厚鋼板寬度方向端部之溫 度控制的遮蔽構件以及用於厚鋼板縱長方向頭尾端部之溫 度控制的流量控制之例子。 比較例2係雖然藉與發明例2相同的設備，於預備冷卻 裝置及控制冷卻裝置中以相同通板速度冷卻，不過，卻不 實施用於厚鋼板寬度方向端部之溫度控制的遮蔽構件以及 用於厚鋼板縱長方向頭尾端部之溫度控制的流量控制之例 子。 比較例3係雖然藉使用與發明例2相同的設備，僅利用 其中預備冷卻裝置冷卻，不過，卻不實施厚鋼板寬度方向 的板端部及厚鋼板縱長方向的頭尾端部之水量控制情形之 例子。本例中圖1 7的預備冷卻裝置1 0的設備長度為1 0 m， 以冷卻水量密度500L / min· m2喷射。此時的冷卻速度為 1 4 °C / s，通過此厚鋼板，自7 5 0 °C冷卻至5 5 0 °C所需冷卻 時間為1 4 . 3 s e c。因此，以通板速度為4 2 m p m通過預備冷 40 312/發明說明書(補件)/93-08/93116860 200523046 卻裝置。這雖然是相較於發 增多，冷卻速度更為提高的 卻裝置進行材質的加工，故 不使用厚鋼板縱長方向的頭 度方向的遮蔽構件。 比較例4就固然使用與發 較例3相同的預備冷卻裝置 板端部及厚鋼板縱長方向的 子力〇以說明。本例以與比較 量密度實施冷卻。又由於遮 向的板端部之溫度下降距離 寬度方向的板端部起僅可遮 圖19及圖20所示，在厚鋼 入厚鋼板縱長方向的頭尾端 之後，依序喷射冷卻水。 比較例5就固然使用與發 冷卻設備的全部冷卻區，於 板縱長方向的頭尾端部實施 明。本例雖然以與實施例1 度冷卻，卻於全部冷卻區實 的頭尾端部之水量調整。 由於遮蔽構件移動量係厚 度下降距離為2 0 0丨uni，故設 部起僅2 0 0 η]ιι]的全部冷卻區 明例3的預備冷卻裝置，水量 理由，不過，由於僅藉預備冷 將冷卻速度設定得較高。此時， 尾端部之水量控制或厚鋼板寬 明例3相同的設備，僅藉與比 冷卻，實施厚鋼板寬度方向的 頭尾端部之水量控制情形之例 例3相同的通板速度、冷卻水 蔽構件移動量即厚鋼板寬度方 為2 0 0 mm，故設定成自厚鋼板 蔽2 0 0 ηιπι的冷卻水般。又，如 板縱長方向的頭尾端部係僅進 部之溫度下降距離（5 0 0腦） 明例1相同的設備，卻於控制 厚鋼板寬度方向的端部及厚鋼 水量控制情形的例子加以說 相同的通板速度、冷卻水量密 施遮蔽構件及厚鋼板縱長方向 鋼板寬度方向的板端部之溫 定成自厚鋼板寬度方向的板端 ，可遮去厚鋼板寬度方向的板 41 312/發明說明書(補件)/93-08/93116860 200523046 端部之冷卻水。另一方面，厚鋼板縱長方向前端部如圖1 5 所示，首先，如圖1 5 A所示，於未喷射冷卻水狀態下待機， 在進入冷卻裝置僅達厚鋼板縱長方向前端部之溫度下降距 離（5 0 0 nun )狀態下亦即如圖1 5 B般噴射冷卻水。厚鋼板 縱長方向尾端部亦同樣實施如圖1 6的控制。 於此，對厚鋼板寬度方向的端部進行如圖9的定義。於 此，溫度下降距離定義為自厚鋼板板寬方向中，厚鋼板的 溫度梯度為零的位置至厚鋼板寬度方向的板端部之距離， 溫度下降量定義為厚鋼板板寬方向中，鋼板溫度梯度為零 的位置之溫度與厚鋼板寬度方向的板端部之溫度的差值。 因此，在厚鋼板寬度方向的板端部之溫度較鋼板中央部之 溫度低情形下為正值，在厚鋼板寬度方向的板端部之溫度 較鋼板中央部之溫度高情形下為負值。厚鋼板縱長方向的 端部如圖14定義，其與厚鋼板寬度方向之溫度下降量或寬 度方向之溫度下降距離所定義者相同。 圖2 2係就冷卻後的厚鋼板的板材之載取予以說明之 圖。自距厚鋼板縱長方向的前端部及尾端部1 5 0 inn]的位置 切出的厚鋼板前端試材5 1和厚鋼板尾端試材5 4以及厚鋼 板寬度方向和厚鋼板縱長方向的中央部的試材5 3切出樣 本，測定拉伸強度。又，厚鋼板板端部的強度藉自距厚鋼 板寬度方向和厚鋼板縱長方向的中央部之試材板端部1 〇 〇 _的位置切出的試片，測定拉伸強度。 厚鋼板寬度方向之切條彎拱測定用試材5 2、厚鋼板縱長 方向的頭尾端部之切條彎拱測定用試材5 5分別如圖2 3及 42 3丨2/發明說明書(補件)/93-08/93116860 200523046 圖24所示，切成薄長方形。圖23顯示厚鋼板寬度方向之 切條彎拱測定用試材的切條位置及彎拱測定位置。切條於 距厚鋼板板端部3 0 0 mm的位置切斷，以切成此時薄長方形 的厚鋼板之最大彎曲量為寬度方向的切條彎拱。圖2 4顯示 厚鋼板縱長方向向之切條彎拱測定用試材的切條位置及彎 拱測定位置，切條於距厚鋼板縱長方向的尾端部3 0 0 m m之 位置切斷，以切成此時薄長方形的厚鋼板的最大背曲置為 縱長方向的切條彎梹。 由表2可知，在適用本發明情形下，儘管全體冷卻速度 大，冷卻後厚鋼板寬度方向的板端部之溫度下降量卻為- 4 °C至3 °C ，較冷卻前的溫度下降量（3 0 °C )小。又，厚鋼 板縱長方向的頭尾端部之溫度下降量亦同樣地為-7 °C至 1 0 °C ，較冷卻前的溫度下降量（5 0 °C )小。其結果，厚鋼 板的板寬方向的殘留應力亦減低，切條後的彎拱亦減小。 又，就厚鋼板的拉伸強度而言，於厚鋼板縱長方向的頭尾 端部及厚鋼板寬度方向的板端部、厚鋼板縱長方向及寬度 方向的中央部約為5 5 0 M p a左右，呈現穩定。又，發明例4 雖係於預備冷卻後實施矯正後控制冷卻之例子，不過，相 較於控制冷卻前的厚鋼板形狀未矯正的發明例1及2，非 常平坦，其結果，利用控制冷卻的冷卻中之溫度分布均一 性更佳，冷卻後厚鋼板寬度方向的板端部及厚鋼板縱長方 向的頭尾端部之溫度下降量減少，切條後的彎拱亦更為減 少 〇 相對於此，於不進行厚鋼板寬度方向的端部及厚鋼板縱 43 312/發明說明書(補件)/93-08/93116860 200523046 長方向的頭尾端部之水量控制的比較例1〜3中，冷卻 鋼板寬度方向及厚鋼板縱長方向的頭尾端部之溫度下 較冷卻前大，其結果，於切條加工後發生大的彎拱。 就厚鋼板的拉伸強度而言，厚鋼板寬度方向的板端部 鋼板縱長方向的頭尾端部亦較厚鋼板中央部大，超過 容許扼圍上限。 又，雖然進行厚鋼板寬度方向的端部及厚鋼板縱長 的頭尾端部之水量控弗彳，不過，並非依照本發明的比 4、5中，冷卻後厚鋼板縱長方向的頭尾端部及厚鋼板 方向的端部之溫度較厚鋼板縱長方向及寬度方向的中 高，故即使就拉伸強度而言，厚鋼板寬度方向的板端 厚鋼板縱長方向的頭尾端部仍較厚鋼板縱長方向及寬 向的中央部小，低於部分容許範圍下限值。又，切條 儘管較比較例1〜3更受到抑制，卻較本發明例1〜3 (產業上之可利用性） 根據本發明，於親軋完成的厚鋼板控制冷卻之際， 鋼板的寬度方向及厚鋼板縱長方向全區，使厚鋼板板 的溫度分布均一，並可使全體冷卻速度大之厚鋼板的 冷卻。其結果，可確保厚鋼板寬度方向或縱長方向之 的均一性，進一步可減低冷卻時的應變及殘留應力。 312/發明說明書(補件)/93-08/93116860 後厚 降量 又， 或厚 部分 方向 較例 寬度 央部 部或 度方 彎棋 大。 可於 面内 控制 材質 44 200523046The thickness of the thick steel plate before cooling is 30 ° C in the widthwise end portion of the thick steel plate in FIG. Figure 1 4 Temperature drop at the head and tail end of the medium-thick steel plate in the longitudinal direction. I 312 / Invention Manual (Supplement) / 93-08 / 93116860 Plate shape, shape. From the perspective of Cheng, the end of the plate will be in the plate. The length is too long, and the plate is controlled. One is 350. Galvanized is used in manufacturing. Known side 2 indicates that the MPa degree of the central steel plate with a thickness of 25 is reduced by 20 0: 5 0 36 2005 23046 ° C. The temperature drop distance of the head and tail of the direction is 50 0 nim. And in Invention Examples 1 and 2, as shown in FIGS. 25 and 26, the shielding member (hereinafter referred to as a shielding plate) used to control the cooling device is used at the left and right, the upper and lower four lengths of each cooling zone 300 _ parent width 35. 111111 father thickness 7 111111 bell 211-! ^ Steel plate. And in order to prevent the cooling water blocked by the shielding plate from falling again to the thick steel plate, it is inclined 15 ° relative to the horizontal line. Also, in Invention Examples 3 and 4, the shielding members used in the pre-cooling device were installed with four left and right and Zn—η i plated steel plated L-shaped shielding members (length 10 mm x width 350 mm x thickness 7 mm X height). 50 li) of shielding components, which can cover the cooling water over the entire length of the device (length 10 m). And because the length of the shielding member in the pre-cooling device is extremely long, there is a risk of deflection due to the weight of the shielding member itself. Therefore, to ensure the rigidity of the shielding member, as shown in Figure 27, processing is performed to form an L-shape. As shown in Fig. 2-8, the structure of mounting ribs at 500-meter intervals is installed in such a manner that the vertical plate faces in the width direction. The purpose is to shield the end of the thick steel plate and prevent the cooling water blocked by the shielding member from falling towards the thick steel plate. Invention Example 1 is an example corresponding to Embodiment 1. Cooling was performed using the devices illustrated in Figures 6 to 8. The control conditions are described in detail using FIG. 7. The number of cooling zones is 15 and the equipment length of each zone is 1.0m. The total length of the control cooling device is 15m. In addition, each zone was sprayed with a cooling water volume density of 1500 L / min · m2, and the cooling rate at this time was about 30 ° C / s (seconds). Since cooling starts at 750 ° C and ends at 550 ° C, the cooling capacity of each zone is (750 ° C — 550 ° C) / zone 15 = 13.3 ° C. Therefore, the number of zones required to use the shielding member at the end in the width direction of the thick steel plate is 30 ° C /13.3 ° C = 2. 26 zones. Therefore, the actual number of zones used is 2.5 37 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046. From the first zone to the second zone, the upper and lower areas are used, and in the third zone, only the lower shield members are used. The amount of movement of the shielding member, that is, the temperature drop distance of the end portion in the width direction of the thick steel plate is 200 mm. Therefore, it is set to cover only 200 mm of cooling water from the end portion in the width direction of the thick steel plate. On the other hand, as shown in FIG. 12, the flow rate adjustment in the head-to-tail direction of the longitudinal direction of the thick steel plate is performed by a flow control device. The amount of temperature drop at the head and tail of the thick steel plate in the longitudinal direction is 50 ° C, and the number of required zones is 50 ° C /13.3 ° C = 3. 8 zones, so it is implemented from zones 1 to 4. The longitudinal end of the thick steel plate is shown in FIG. 15. First, as shown in FIG. 15A, it stands by in the state where the cooling water is not sprayed, and enters the cooling device only when the temperature drops to the longitudinal end of the thick steel plate. That is, spray cooling water as shown in Figure 1 5B. The longitudinal end of the thick steel plate is also controlled as shown in Fig. 16. And because the cooling rate of the control cooling device is about 3 (TC / s, the cooling time required for controlling the cooling becomes (7 5 0 ° C — 5 5 0 ° C) / 3 0 ° C / s = 6.6sec (seconds) , The control board speed of the cooling device is (15m / 6.6sec) x 60 = 134mpm (per decimeter). Invention Example 2 corresponds to another embodiment of Embodiment 1, the cooling water volume density is 1 2 0 0 L / mi η · m2. The conditions other than the cooling water volume density are the same as those of the invention example 1. The invention example 3 corresponds to the embodiment 2 and uses the device illustrated in FIG. 17. First, it is cooled by the pre-cooling device 10 and uniformized. After the temperature distribution deviation of the thick steel plate in the width direction, cooling is performed by controlling the cooling device 20 to uniformize the temperature distribution deviation of the head and tail ends in the longitudinal direction of the thick steel plate. Figure 17 The equipment length of the preliminary cooling device 10 is 1.0 m, can be sprayed at a cooling water volume density of 100 L / mi η · m2, and the cooling rate at this time is about 4 ° C / 38 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 s. Since the temperature at the end of the plate in the width direction of the steel plate is 720 ° C, the thickness of the steel plate is widened from 750 ° C. The cooling time of the central part in the degree direction to 7 2 0 ° C is (7 5 0 ° C — 7 2 0 ° C) / 4 ° C / s = 7 · 5 sec. Therefore, the pass-through speed of the preliminary cooling device 10 (10m / 7.5sec) x 60 = 80mpni. Moreover, as shown in FIG. 19 and FIG. 20, the head and tail ends in the longitudinal direction of the thick steel plate are temperatures that enter only the head and tail ends in the longitudinal direction of the thick steel plate. After the descending distance (500 min), the cooling water is sprayed in order. The moving amount of the shielding member, that is, the temperature drop distance of the end portion of the thick steel plate is 200 mm, so it is set to the end of the thick steel plate in the width direction. It can only cover 200 mm of cooling water. Also, the control cooling device in Figure 17 is the same as that of Invention Example 1. The number of cooling zones is 15 and the equipment length of each zone is 1.0m. The total length is 15m. In addition, it is sprayed at a cooling water volume density of 1500 L / min · m2 in each zone, and the cooling rate at this time is about 30 ° C / s. For controlling the cooling device 20, since 7 2 ° C It starts to cool and finishes cooling at 5 50 ° C, so the cooling amount of each zone is (7 2 0 ° C — 5 50 ° C) / 1 5 zone = 1 1 · 3 ° C. The flow rate adjustment of the head and tail ends in the longitudinal direction of the steel plate is that the temperature drop of the head and tail ends in the longitudinal direction of the thick steel plate is 50 ° C. However, only the temperature distribution of 30 ° C minutes is eliminated by the pre-cooling device. Deviation, so the control cooling device must control the temperature drop of the head and tail end of the thick steel plate in the longitudinal direction of 20 ° C minutes. For this reason, the number of necessary zones is 20 ° C / 1 1.3 ° C = 1.8, so it is implemented from zones 1 to 2. Also, the front end portion of the thick steel plate in the longitudinal direction is shown in FIG. 15. First, as shown in FIG. 15 A, the standby state is when the cooling water is not sprayed. In the state of falling distance, the cooling water is sprayed like 39 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 Figure 1 5B. The tail end portion of the thick steel plate in the longitudinal direction is similarly controlled as shown in FIG. 16. And because the cooling rate of the control cooling device is about 30 ° C / s, the cooling time becomes (7 2 (ΓC — 5 50 ° C) / 30 ° C / s = 5.7sec, the through plate of the control cooling device The speed is (15m / 5. 7sec) x 60 = 1 5 8 in pm. Moreover, the flow rate adjustment of the head and tail ends in the longitudinal direction of the thick steel plate is implemented by a flow rate adjustment valve as shown in Figure 12. Invention Example 4 is implemented In the second embodiment, a straightening machine is provided between the pre-cooling device and the control cooling device, and the cooling conditions are the same as those of the inventive example 3. Comparative example 1 uses the same equipment as the inventive example 1 to cool at the same plate speed, but However, the shielding member for controlling the temperature in the widthwise end portion of the steel plate and the flow rate control for controlling the temperature in the lengthwise end and end portions of the steel plate are not implemented. Comparative Example 2 is the same as Invention Example 2 Equipment, cooling in the pre-cooling device and the control cooling device at the same plate speed, but it does not implement the shielding member for the temperature control of the width direction end of the steel plate and the head and tail end of the steel plate in the longitudinal direction. Temperature control flow control Comparative Example 3 uses the same equipment as in Invention Example 2 to cool only with the pre-cooling device, but does not implement the plate end in the width direction of the thick steel plate and the head and tail in the lengthwise direction of the steel plate. This is an example of the water volume control situation. In this example, the preliminary cooling device 10 in Figure 17 has a length of 10 m and sprays at a cooling water volume density of 500 L / min · m2. The cooling rate at this time is 1 4 ° C / s, through this thick steel plate, the cooling time required to cool from 750 ° C to 550 ° C is 14.3 sec. Therefore, the pre-cooling 40 312 / invention specification is passed at a plate speed of 4 2 mpm ( (Supplement) / 93-08 / 93116860 200523046 but the device. Although the cooling rate is increased compared to the increase in the number of hair, the device is processed by the material, so the shielding member in the longitudinal direction of the thick steel plate is not used. Comparative Example 4 uses the same pre-cooling device plate end and thick steel plate longitudinal force 0 as in Example 3 for explanation. In this example, the cooling is performed at a comparative density. The plate end is also shielded. Temperature drop distance of the part The end of the plate can only cover the ends shown in Figure 19 and Figure 20, and after the thick steel enters the head and tail ends in the longitudinal direction of the thick steel plate, the cooling water is sprayed in order. This area is described at the head and tail ends of the plate in the longitudinal direction. Although this example is cooled by 1 degree from the embodiment, the water amount is adjusted at the head and tail ends of the entire cooling zone. The moving amount of the shielding member is the thickness reduction distance. It is 200 uni, so the preparatory cooling device of the entire cooling zone of Example 3 is set as the preparatory cooling device of Example 3 for the amount of water. However, because the precooling is used only, the cooling rate is set higher. At this time, the same equipment as in Example 3 for the amount of water at the tail end or the width of the thick steel plate is only the same as that in Example 3 for the case where the amount of water at the head and tail of the width of the thick steel plate is controlled by specific cooling. The movement amount of the cooling water shielding member, that is, the width of the thick steel plate is 200 mm, so the cooling water shielding member is set to be cooling water of 2 0 ηm from the thick steel plate. In addition, if the head and tail ends in the longitudinal direction of the plate are only the temperature drop distance of the forward part (500 brains), the same equipment as in Example 1 is used to control the ends of the thick steel plate in the width direction and the amount of thick molten steel. For example, let ’s say that the same plate speed and cooling water amount are applied to the shield member and the thickness of the plate end in the longitudinal direction of the thick steel plate. The temperature of the plate end in the width direction of the steel plate is set from the plate end in the width direction of the thick steel plate. / Invention Specification (Supplement) / 93-08 / 93116860 200523046 Cooling water at the end. On the other hand, the front end portion of the thick steel plate in the longitudinal direction is shown in FIG. 15. First, as shown in FIG. At a temperature drop distance (500 nun), the cooling water is sprayed as shown in Figure 15B. The longitudinal end of the thick steel plate is also controlled as shown in FIG. 16. Here, the end portion in the width direction of the thick steel plate is defined as shown in FIG. 9. Here, the temperature drop distance is defined as the distance from the position where the temperature gradient of the thick steel plate is zero in the width direction of the thick steel plate to the end of the plate in the width direction of the thick steel plate, and the temperature drop is defined as the steel plate in the width direction of the thick steel plate. The difference between the temperature at the position where the temperature gradient is zero and the temperature at the end of the plate in the width direction of the thick steel plate. Therefore, it is a positive value when the temperature of the plate end in the width direction of the thick steel plate is lower than the temperature of the center of the steel plate, and is negative when the temperature of the plate end in the width direction of the thick steel plate is higher than the temperature of the center of the steel plate. The end portion of the thick steel plate in the longitudinal direction is defined as shown in Fig. 14 and it is the same as the amount of temperature drop in the width direction of the thick steel plate or the temperature drop distance in the width direction. Fig. 22 is a diagram explaining the loading of the plate of the thick steel plate after cooling. Thick steel sheet front end specimen 5 1 and thick steel sheet end specimen 5 4 cut from the front end and tail end portion of the thick steel sheet in the longitudinal direction (150 inn). A sample was cut out from the specimen 5 3 in the center of the direction, and the tensile strength was measured. In addition, the strength of the end portion of the thick steel plate was measured from a test piece cut out from the position of the end portion of the sample plate at the center of the thick steel plate width direction and the longitudinal direction of the thick steel plate, and the tensile strength was measured. Specimen for measuring stripe arches in the width direction of thick steel plates 5 2. Specimen for stripe arches measurement in the longitudinal direction of thick steel plates at the head and tail ends 5 5 See Figures 2 3 and 42 3 丨 2 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 As shown in Figure 24, cut into thin rectangles. Fig. 23 shows the strip cutting position and the arch measurement position of the specimen for measuring the strip and arch in the width direction of the thick steel plate. The strip is cut at a distance of 300 mm from the end of the thick steel plate, and the strip is arched in the width direction with the maximum bending amount of the thick steel plate cut into thin rectangles at this time. Fig. 24 shows the strip cutting position and the arch measurement position of the test strip for arch cutting in the longitudinal direction of the thick steel plate. The cut strip is cut at a distance of 300 mm from the end of the thick steel plate in the longitudinal direction. In this case, the maximum bending of the thick steel plate cut into the thin rectangular shape at this time is set as a longitudinal strip bending. As can be seen from Table 2, in the case where the present invention is applied, although the overall cooling rate is large, the temperature drop of the plate end in the width direction of the thick steel plate after cooling is -4 ° C to 3 ° C, which is lower than the temperature drop before cooling. (30 ° C) small. In addition, the temperature drop of the head and tail end of the thick steel plate in the longitudinal direction is also -7 ° C to 10 ° C, which is smaller than the temperature drop (50 ° C) before cooling. As a result, the residual stress in the width direction of the thick steel plate is also reduced, and the bending arch after the slitting is also reduced. The tensile strength of the thick steel plate is about 5 5 0 M at the head and tail end portion of the thick steel plate in the longitudinal direction, the end portion of the thick steel plate in the width direction, and the central portion of the thick steel plate in the longitudinal direction and the width direction. It is stable around pa. Inventive example 4 is an example of controlling cooling after correction after preliminary cooling, but it is very flat compared to inventive examples 1 and 2 where the shape of the thick steel plate before controlling cooling is not corrected. As a result, the controlled cooling The uniformity of the temperature distribution during cooling is better. After cooling, the temperature drop of the plate end in the width direction of the thick steel plate and the head and tail end in the lengthwise direction of the steel plate is reduced, and the curved arch after cutting is also reduced. Therefore, in Comparative Examples 1 to 3 in which the end portion of the thick steel plate in the width direction and the thickness of the steel plate in the longitudinal direction 43 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 in the longitudinal direction of the head and tail ends are not controlled, The temperature at the head and tail ends of the cooling steel plate in the width direction and the thick steel plate in the longitudinal direction is higher than that before cooling. As a result, a large arch occurs after the slitting process. In terms of the tensile strength of the thick steel plate, the end portion of the plate in the width direction of the steel plate is also larger than the center portion of the thick plate in the longitudinal direction, which exceeds the upper limit of the allowable choke. In addition, although the amount of water in the widthwise end of the thick steel plate and the lengthwise head and tail ends of the thick steel plate are controlled, the heads and tails in the lengthwise direction of the thick steel plate are not cooled in the ratios 4 and 5 according to the present invention. The temperature at the end and the end in the direction of the thick steel plate is higher than that in the longitudinal direction and width direction of the thick steel plate. Therefore, even in terms of tensile strength, the end of the plate in the width direction of the thick steel plate still has the head and tail ends in the lengthwise direction. The central part of the thicker steel plate in the longitudinal direction and the width direction is small, and is lower than the lower limit of the partial allowable range. In addition, although the slitting is more suppressed than those of Comparative Examples 1 to 3, it is more than that of Examples 1 to 3 of the present invention (industrial availability) According to the present invention, the width of the steel sheet is controlled when cooling is performed on the thick steel sheet after the finish rolling. Direction and the entire length of the thick steel plate, the temperature distribution of the thick steel plate is uniform, and the entire thick steel plate with a large cooling rate can be cooled. As a result, uniformity in the width or length direction of the thick steel plate can be ensured, and the strain and residual stress during cooling can be further reduced. 312 / Description of the Invention (Supplement) / 93-08 / 93116860 After the thickness is reduced, or the direction of the thick part is relatively large. The width of the central part or the degree of the curve is large. Can be controlled in-plane material 44 200523046

I mm μ郷）rc/s) 冷卻 〇 m ο R VO 筘 Η R oo 卜 1 1 CN) R 冷卻 (瓣·酬 讀1 1 1 t—H Q 1 CO H CO r—H 1 溫靡倒直 (寬度·縱艮中央部）（。C) 翻 冷卻 出口 cn wn un v〇 υη A un i〇 1 » υη mmn 入口 (爾冷細口） 1—H in v〇 2 g CN 2; F! v〇 m 115 1 1 m 1 1 (mpm) 囊1 δ m m g 8R r-H 3 g 1 1 s «1 1 1 s 1 1 1=ΓΤ II 1-4ζ 2 1 1 〜2z 1 全區 議1 i 11 全區 全區 Ιχπ 纖餅 麵冷卻 l-2z上下僅3z下 2-2z上下僅3z下 不麵 全區 讎 冷卻 不麵 g Nm 全區 不麵 不麵 不獅 全區 不獅 1 薬 翻 冷卻 1 s jfes 麵 § E TO E TO 11 E ?ys E jys 不麵 § 不麵 關 利細 1 不i麵 r—Η 1 1 MM2 1 MM3 1劉朋4 | 1 t\mn 1 t麵2 fcfc^!!3 t 獅!14 t酬5 0900911 £6/〇〇0-£6/(#:聲)_熙縮^餾/2£ 200523046 表2 溫度下降量 (°〇 切條彎拱 (mm) 拉伸搬 (MPa) 寬度方向 的纖 縱長方向的 頭尾纖 寬度方向 白·β 縱長方向的 mm 寬度·縱長中 央部 寬度方向 的觸 縱長方向的頭 發明 例1 -4 10 9 5 553 551 547 發明 例2 -5 9 10 4 556 550 547 發明 例3 3 -7 7 4 551 549 553 發明 例4 -1 5 3 2 549 555 546 比較 例1 31 49 90 21 549 620 650 比較 例2 52 74 157 32 548 630 610 比較 例3 67 83 202 36 551 650 599 比較 例4 -30 -30 91 13 551 490 501 比較 例5 -40 -18 121 8 550 485 499 46 312/發明說明書(補件)/93-08/93116860 200523046 【圖式簡單說明】 圖1係說明冷卻高溫厚鋼板情形下，鋼板表面溫度與熱 通量（v a 1 u e 〇 f h e a t f 1 u X )之關係圖。 圖2係說明冷卻厚鋼板情形下，鋼板上面的水流之圖。 圖3係說明藉由習知方法進行厚鋼板寬度方向端部的冷 卻控制時，厚鋼板寬度方向端部及厚鋼板中央部的溫度歷 時變化之圖。 圖4係圖示本發明第1實施形態，說明進行厚鋼板寬度 方向端部之冷卻控制時，厚鋼板寬度方向端部及厚鋼板中 央部的溫度歷時變化之圖。 圖5係圖示本發明第2實施形態，說明進行厚鋼板寬度 方向端部之冷卻控制時，厚鋼板寬度方向端部及厚鋼板中 央部的溫度歷時變化之圖。 圖6係實施本發明第1實施形態的厚鋼板控制冷卻裝置 之概念圖。 圖7本發明控制冷卻裝置之概念圖。 圖8係使用於本發明控制冷卻裝置之冷卻水的遮蔽構件 之安裝概念圖。 圖9係定義厚鋼板寬度方向端部的過冷之圖。 圖1 0係說明具體實施本發明第1實施形態時的控制方 法之圖。 圖1 1係顯示實施及不實施本發明第1實施形態時的冷 卻後厚鋼板寬度方向的溫度分布之圖。 圖1 2係本發明第1實施形態中，於厚鋼板縱長方向的 47 312/發明說明書(柿件)/93-08/93116860 200523046 頭尾端部實施水量控制的控制冷卻裝置之構造圖。 圖1 3係本發明第1實施形態中，於厚鋼板縱長方向的 頭尾端部實施水量控制的控制冷卻裝置的構造圖。 圖1 4係定義厚鋼板縱長方向的頭尾端部的過冷之圖。 圖1 5 A、1 5 B係本發明第1實施形態中厚鋼板縱長方向 的前端部通板時的冷卻水作動要領之說明圖。 圖1 6 A、1 6 B係本發明第1實施形態中厚鋼板縱長方向 的尾端部通板時的冷卻水作動要領之說明圖。 圖1 7係實施本發明第2實施形態的厚鋼板控制冷卻裝 置之概念圖。 圖1 8係使用於本發明厚鋼板控制冷卻裝置的冷卻水遮 蔽構件之安裝概念圖。 圖1 9係厚鋼板縱長方向的前端部通板時的層流冷卻裝 置作動要領之說明圖。 圖2 0係厚鋼板縱長方向的尾端部通板時的層流冷卻裝 置作動要領之說明圖。 圖2 1係於本發明中設置矯正機3 0時之設備佈置 (layout)圖 。 圖2 2係說明本發明實施例中冷卻後的鋼板切斷位置圖。 圖2 3係本發明實施例中冷卻後的鋼板5 2切條時的切條 彎拱的測定方法。 圖2 4係本發明實施例中冷卻後的鋼板5 5切條情形的切 條彎梹的測定方法。 圖2 5係顯示本發明實施例中控制冷卻裝置内的遮蔽板 48 312/發明說明書(補件)/93-08/93116860 200523046 的尺寸及其配置。 圖2 6係顯示本發明實施例中控制冷卻裝置内的遮蔽板 的尺寸及其配置。 圖2 7係顯示本發明實施例中安裝於預備冷卻裝置内的 遮蔽構件之構造。 圖2 8係顯示本發明實施例中預備冷卻裝置内的遮蔽構 件的配置。 (元件符號說明） 1 厚 鋼 板 輥 軋 機 2 厚 鋼 板 3 輥 台 ( r 〇 11 e r t ab 1 e ) 10 層 流 冷 卻 裝 置 11 上 管 集 箱 ( uppe r he ader ) 12 下 管 集 箱 ( 1 o w e r he a d e r ) 13、14 水 流 15 遮 蔽 構 件 16 ( 遮 蔽 構 件 的 ) 橫 向 行進 機 17 光 電 管 ( ph o t 0 c e 11 ) 20 細 縫 噴 射 冷 卻 裝 置 21 上 管 集 箱 22 下 管 集 箱 23 上 細 縫 喷 射 冷 卻 裝 置 24 下 細 縫 喷 射 冷 卻 裝 置 25 控 制 冷 卻 裝 置 前 段 312/發明說明書(補件)/93-08/93116860 49 200523046I mm μ 郷) rc / s) Cooling 〇m ο R VO 筘 Η R oo Bu 1 1 CN) R Cooling (lobe · read 1 1 1 t—HQ 1 CO H CO r—H 1 Width · Central part of vertical axis (C) Turning cooling outlet cn wn un v〇υη A un i〇1 »υη mmn Inlet (erlang fine opening) 1—H in v〇2 g CN 2; F! V〇m 115 1 1 m 1 1 (mpm) Pouch 1 δ mmg 8R rH 3 g 1 1 s «1 1 1 s 1 1 1 = ΓΤ II 1-4ζ 2 1 1 ～ 2z 1 All districts 1 i 11 All districts Ιχπ Cooling of bread dough l-2z up and down only 3z down 2-2z up and down only 3z down and not facing the whole area g Nm not facing the whole area not facing the lion whole area not being the lion 1 turning over cooling 1 s jfes surface§ E TO E TO 11 E? Ys E jys Non-face § Non-face Guan Li 1 Non-face r-Η 1 1 MM2 1 MM3 1 Liu Peng 4 | 1 t \ mn 1 t face 2 fcfc ^ !! 3 t lion ! 14 t pay 5 0900911 £ 6 / 〇〇0- £ 6 / (#: 声) _xi shrink ^ distillation / 2 £ 200523046 Table 2 Temperature drop (° 〇 cut strip arch (mm) tensile moving (MPa ) The width and length of the fiber in the longitudinal direction of the head and pigtail width direction white · β mm in the longitudinal direction width · length Example of head touching the longitudinal direction in the width direction of the central part Invention Example 1 -4 10 9 5 553 551 547 Invention Example 2 -5 9 10 4 556 550 547 Invention Example 3 3 -7 7 4 551 549 553 Invention Example 4 -1 5 3 2 549 555 546 Comparative example 1 31 49 90 21 549 620 650 Comparative example 2 52 74 157 32 548 630 610 Comparative example 3 67 83 202 36 551 650 599 Comparative example 4 -30 -30 91 13 551 490 501 Comparative example 5 -40 -18 121 8 550 485 499 46 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 [Simplified Illustration] Figure 1 shows the surface temperature and heat flux of the steel plate when cooling high-temperature thick steel plates ( va 1 ue 〇fheatf 1 u X). Fig. 2 is a diagram illustrating the water flow on the steel plate in the case of cooling a thick steel plate. Fig. 3 is a graph illustrating the temporal change in temperature of the end portion of the thick steel plate and the center portion of the thick steel plate when cooling control of the end portion of the thick steel plate is performed by a conventional method. Fig. 4 is a diagram illustrating the first embodiment of the present invention, and illustrates the change in temperature over time in the widthwise end portion of the thick steel plate and the center portion of the thick steel plate when cooling control is performed on the widthwise end portion of the thick steel plate. Fig. 5 is a diagram illustrating a second embodiment of the present invention, and illustrates a change in the temperature of the end portion of the thick steel plate in the width direction and the central portion of the thick steel plate during cooling control of the end portion of the thick steel plate in the width direction. Fig. 6 is a conceptual diagram of a thick steel plate controlled cooling device embodying the first embodiment of the present invention. Fig. 7 is a conceptual diagram of a control cooling device according to the present invention. Fig. 8 is a conceptual view of the installation of a shielding member for cooling water used in the control cooling device of the present invention. Fig. 9 is a diagram defining the undercooling at the end in the width direction of the thick steel plate. Fig. 10 is a diagram illustrating a control method when the first embodiment of the present invention is specifically implemented. Fig. 11 is a graph showing the temperature distribution in the width direction of the thick steel plate after cooling when the first embodiment of the present invention is implemented and not implemented. Fig. 12 is a structural diagram of a control cooling device for controlling the amount of water in the head and tail ends of 47 312 / Invention Manual (Persimmon) / 93-08 / 93116860 200523046 in the longitudinal direction of a thick steel plate in the first embodiment of the present invention. Fig. 13 is a structural diagram of a control cooling device that controls the amount of water at the head and tail ends in the longitudinal direction of a thick steel plate in the first embodiment of the present invention. Fig. 14 is a diagram for defining the supercooling of the head and tail ends in the longitudinal direction of the thick steel plate. Figs. 15A and 15B are explanatory diagrams of the operation method of the cooling water when the front end portion of the thick steel plate in the longitudinal direction of the first embodiment of the present invention passes through the plate. Figs. 16A and 16B are explanatory diagrams of the operation method of the cooling water when the tail end portion of the thick steel plate in the longitudinal direction of the first embodiment of the present invention passes through the plate. Fig. 17 is a conceptual diagram of a thick steel plate control cooling device for implementing a second embodiment of the present invention. Fig. 18 is a conceptual diagram of the cooling water shielding member used in the thick steel plate controlled cooling device of the present invention. Fig. 19 is an explanatory diagram of the operation method of the laminar cooling device when the front end portion of the 9-series thick steel plate passes through the plate. Fig. 2 is an explanatory diagram of the operation method of the laminar cooling device when the tail end portion of the 0-series thick steel plate passes through the plate in the longitudinal direction. FIG. 21 is a layout diagram of the equipment when the corrector 30 is set in the present invention. Fig. 22 is a diagram illustrating a cut position of the steel sheet after cooling in the embodiment of the present invention. Fig. 2 is a method for measuring the stripe arch when the steel sheet 52 is cooled after being stripped in the embodiment of the present invention. Fig. 24 is a method for measuring the strip bending of a steel plate after it is cooled in the embodiment of the present invention. FIG. 5 shows the size and configuration of the shielding plate 48 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 in the control cooling device in the embodiment of the present invention. Figures 26 and 6 show the size and configuration of the shielding plate in the control cooling device in the embodiment of the present invention. Fig. 27 shows the structure of a shielding member installed in a preliminary cooling device in the embodiment of the present invention. Fig. 28 is a diagram showing a configuration of a shielding member in the preliminary cooling device in the embodiment of the present invention. (Description of component symbols) 1 Heavy steel plate rolling mill 2 Heavy steel plate 3 Roll stand (r 〇11 ert ab 1 e) 10 Laminar flow cooling device 11 Upper pipe header (uppe r he ader) 12 Lower pipe header (1 ower he ader) 13, 14 water flow 15 shielding member 16 (of the shielding member) transverse traveler 17 photoelectric tube (ph ot 0 ce 11) 20 narrow slot spray cooling device 21 upper tube header 22 lower tube header 23 upper thin slot spray cooling device 24 Lower Slit Jet Cooling Device 25 Control Cooling Device Front Section 312 / Invention Manual (Supplement) / 93-08 / 93116860 49 200523046

26 控 制 冷 卻 裝 置 後 段 27 除 水 輥 筒 28 上 部 遮 蔽 構 件 29 下 部 遮 蔽 構 件 30 預 備 冷 卻 裝 置 入 口 側 溫 度 計 3 1 控 制 冷 卻 裝 置 入 口 側 溫 度 計 32 控 制 冷 卻 裝 置 出 口 側 溫 度 計 4 1 流 量 控 制 裝 置 42 三 向 閥 5 1 鋼 板 前 端 試 材 52 見 度 方 向 的 切 條 彎 拱 測 定 用 試 材 53 見 度 方 向 及 縱 長 方 向 中 央 部 的 試材 54 鋼 板 尾 端 試 材 55 縱 長 方 向 的 切 條 彎 拱 測 定 用 試 材 312/發明說明書(補件)/93-08/93】】6860 5026 Control cooling device rear section 27 Dewatering roller 28 Upper shielding member 29 Lower shielding member 30 Pre-cooling device inlet-side thermometer 3 1 Control cooling device inlet-side thermometer 32 Control cooling device outlet-side thermometer 4 1 Flow control device 42 Three-way valve 5 1 Specimen for the front end of the steel plate 52 Specimen for the measurement of the cut-off arches in the viewing direction 53 Specimen for the central part in the viewing direction and the longitudinal direction 54 Specimen for the test of the longitudinal end of the steel plate 55 312 / Invention Specification (Supplement) / 93-08 / 93】 6860 50

Claims (1)

200523046 拾、申請專利範圍： 1 . 一種厚鋼板之控制冷卻 成熱軋後，具有：第1冷卻 寬度方向的溫度分布，一面 在厚鋼板寬度方向之溫度分 控制冷卻厚鋼板的寬度方向 2. 如申請專利範圍第1項 中該厚鋼板完成熱軋，上述 立冷卻區的通過型控制冷卻 區，一面限制厚鋼板寬度方 面冷卻；上述第2冷卻步驟 卻區之後續冷卻區，以相同 度方向全體。 3. 如申請專利範圍第1項 中該厚鋼板完成熱軋，其中 卻裝置，一面限制厚鋼板寬 量，一面冷卻； 上述第2冷卻步驟係藉設 有複數獨立冷卻區的通過型 度控制冷卻厚鋼板的寬度方 4. 如申請專利範圍第1至 冷卻方法，其中藉設於厚鋼 行上述厚鋼板寬度方向兩側 5 .如申請專利範圍第2或 方法’其特徵為’該厚鋼板完 步驟，其係一面均一化厚鋼板 冷卻；以及第2冷卻步驟，其 布均一化後，以相同冷卻速度 全體。 之厚鋼板之控制冷卻方法，其 第1冷卻步驟係藉具有複數獨 裝置之一個以上的入口側冷卻 向的兩側端部之冷卻水量，一 係藉上述一個以上的入口側冷 冷卻速度控制冷卻厚鋼板的寬 之厚鋼板之控制冷卻方法，其 上述第1冷卻步驟係藉預備冷 度方向的兩側端部之冷卻水 於上述預備冷卻裝置後段之具 控制冷卻裝置，以相同冷卻速 向全體。 3項中任一項之厚鋼板之控制 板寬度方向端部之遮蔽構件進 端部的冷卻水量限制。 4項之厚鋼板之控制冷卻方 51 312/發明說明書(補件)/93·08/93116860 200523046 法，其中在上述控制冷卻裝置前段的冷卻中，限制厚鋼板 縱長方向的頭尾端部之冷卻水量。 6. 如申請專利範圍第3或4項之厚鋼板之控制冷卻方 法，其中在上述預備冷卻裝置或上述預備冷卻裝置及上述 控制冷卻裝置的冷卻中，限制厚鋼板縱長方向的頭尾端部 之冷卻水量。 7. 如申請專利範圍第5或6項之厚鋼板之控制冷卻方 法，其中利用厚鋼板縱長方向的頭尾端部之通過信號作動 指定時間的水量控制手段，進行厚鋼板縱長方向的頭尾端 部之冷卻水量限制。 8. 如申請專利範圍第2、4、5及7項中任一項之厚鋼板 之控制冷卻方法，其中上述控制冷卻裝置的前段部於各區 間設置遮蔽構件，該遮蔽構件設在可進行厚鋼板寬度方向 的端部之水量限制的厚鋼板寬度方向端部，遮蔽構件可於 各區及上下面分別獨立遮蔽厚鋼板寬度方向端部之冷卻 水。 9. 如申請專利範圍第8項之厚鋼板之控制冷卻方法，其 中具有測定控制冷卻前厚鋼板寬度方向之溫度分布的手 段，由所測定的溫度分布解析厚鋼板寬度方向板端部之溫 度下降量以及與發生溫度下降的厚鋼板寬度方向板端部間 之距離，根據其結果，運算設於控制冷卻裝置前段的各冷 卻區的遮蔽構件的遮蔽量以及實施遮蔽的冷卻區數，根據 運算結果控制遮蔽構件。 1 0 .如申請專利範圍第3、4、6及7項中任一項之厚鋼 52 3 ] 2/發明說明書(補件)/93-08/93116860 200523046 板之控制冷卻方法，其中測定預備冷卻前厚鋼板寬度方向 之溫度分布，由所測定溫度分布解析厚鋼板寬度方向板端 部之溫度下降量以及與發生溫度下降之寬度方向的板端部 間之距離，根據其結果，運算於預備冷卻裝置中遮蔽構件 的遮蔽量以及冷卻時間，根據運算結果，控制預備冷卻裝 置的遮蔽構件及通板速度。 1 1 . 一種厚鋼板，在熱軋後，藉由申請專利範圍第1至 1 0項中任一項之控制冷卻方法控制冷卻而製造。 1 2. —種厚鋼板之控制冷卻裝置，係具有複數個獨立冷 卻區的通過型控制冷卻裝置，其特徵為，各冷卻區可進行 冷卻水量密度在1200L / min· m2以上的通水，並於前段冷 卻區設置限制厚鋼板寬度方向的兩側端部之冷卻水量的遮 蔽構件。 1 3 . —種厚鋼板之控制冷卻裝置，係於輥軋機後面依序 排列預備冷卻裝置、控制冷卻裝置的冷卻裝置，其特徵為， 上述預備冷卻裝置的投入水量密度在500L / min· m2以 下，且設置限制厚鋼板寬度方向兩側端部之冷卻水量的遮 蔽構件，又，上述控制冷卻裝置係具有複數個獨立冷卻區 的通過型裝置，各冷卻區可進行冷卻水量密度在1200L/ m i η · m2以上的通水。 1 4.如申請專利範圍第1 2或1 3項之厚鋼板之控制冷卻 裝置，其中控制上述遮蔽構件的動作，使上述厚鋼板寬度 方向之溫度分布均一化。 1 5 .如申請專利範圍第1 2至1 4項中任一項之厚鋼板之 53 312/發明說明書(補件)/93-08/93116860 200523046 控制冷卻裝置，其中具有利用厚鋼板縱長方向之前端部及 尾端部之通過信號作動指定時間之水量控制手段。 1 6 .如申請專利範圍第1 2、1 4或1 5項之厚鋼板之控制 冷卻裝置，其中上述控制冷卻裝置使用細縫噴射冷卻噴嘴。 1 7 .如申請專利範圍第1 3、1 4或1 5項之厚鋼板之控制 冷卻裝置，其中上述預備冷卻裝置使用層流冷卻喷嘴，上 述控制冷卻裝置使用細縫噴射冷卻噴嘴。 1 8.如申請專利範圍第1 2、1 4、1 5及1 6項中任一項之 厚鋼板之控制冷卻裝置，其中設於上述控制冷卻裝置前段 部的冷卻區間之遮蔽構件可--於各冷卻區及上述冷卻區 的各個上面部及下面部，分別獨立遮蔽厚鋼板寬度方向端 部之冷卻水。 1 9.如申請專利範圍第1 8項之厚鋼板之控制冷卻裝置， 其中具有測定控制冷卻前厚鋼板寬度方向之溫度分布的手 段，以及根據所測定的溫度分布解析厚鋼板寬度方向的板 端部之溫度下降量以及與發生溫度下降的厚鋼板寬度方向 的板端部間之距離的手段，並具有根據其結果，運算設於 控制冷卻裝置前段各冷卻區的遮蔽構件之遮蔽量以及實施 遮蔽的冷卻區數的手段，又具有根據運算結果控制遮蔽構 件的機構。 2 0 .如申請專利範圍第1 3、1 4、1 5及1 7項中任一項之 厚鋼板之控制冷卻裝置，其中具有測定利用上述預備冷卻 裝置的冷卻前厚鋼板寬度方向之溫度分布的手段，以及由 所測定溫度分布解析厚鋼板寬度方向的板端部之溫度下降 54 3】2/發明說明書(補件)/93-08/931〗6860 200523046 量以及與發生溫度下降的厚鋼板寬度方向的板端部間之距 離的手段，並具有根據其結果，運算於利用預備冷卻裝置 的遮蔽構件之遮蔽量以及冷卻時間的手段，又具有可根據 運算結果，可控制預備冷卻裝置中遮蔽構件及通板速度的 機構。 2 1 ·如申請專利範圍第1 2、1 4、1 5、1 6、1 8及1 9項中 任一項之厚鋼板之控制冷卻裝置，其中在上述控制冷卻裝 置前設置矯正機。 2 2 ·如申請專利範圍第1 3、1 4、1 5、1 7及2 0項中任一 項之厚鋼板之控制冷卻裝置，其中在上述預備冷卻裝置與 上述控制冷卻裝置之間設置矯正機。 55 312/發明說明書(補件)/93-08/93116860200523046 Pick up and apply for patent scope: 1. A kind of thick steel plate after controlled cooling into hot rolling, has: the first cooling width temperature distribution, on the one hand, the temperature of the thick steel plate in the width direction controls cooling the thick steel plate in the width direction 2. Such as The hot rolling of the thick steel plate is completed in the first item of the scope of the patent application. The pass-through controlled cooling zone of the above vertical cooling zone restricts the width of the thick steel plate while cooling; the subsequent cooling zone of the second cooling step zone is the same degree in the entire direction . 3. If the thick steel plate has been hot rolled in item 1 of the scope of the patent application, it is equipped with a device that limits the width of the thick steel plate and cools it. The second cooling step is based on through-type controlled cooling with a plurality of independent cooling zones. The width of the thick steel plate 4. If the scope of patent application No. 1 to the cooling method, it is borrowed from the thick steel line on the two sides in the width direction of the above-mentioned thick steel plate 5. If the scope of patent application No. 2 or the method is 'characterized by' In the second step, the thick steel plate is uniformly cooled on one side; and in the second cooling step, after the cloth is uniformized, the whole is cooled at the same cooling rate. In the method for controlling cooling of thick steel plates, the first cooling step is to use the amount of cooling water on both sides of the inlet-side cooling direction with more than one Sudoku device, and the first is to control the cooling by using one or more inlet-side cooling rates. The method for controlling cooling of a thick steel plate with a wide and thick steel plate, wherein the first cooling step is to control cooling devices at the rear of the preliminary cooling device by using cooling water at both ends of the preliminary cooling direction, and apply the same cooling speed to the whole. . Control of the thick steel plate of any one of 3 items. The amount of cooling water at the end of the shield member at the end in the width direction is limited. Control method for thick steel plate of 4 items 51 312 / Invention specification (Supplement) / 93 · 08/93116860 200523046 method, in the cooling of the front part of the above control cooling device, the length of the head and tail end of the thick steel plate in the longitudinal direction is restricted Amount of cooling water. 6. The method for controlling the cooling of thick steel plates according to item 3 or 4 of the scope of patent application, wherein in the cooling of the above-mentioned pre-cooling device or the pre-cooling device and the above-mentioned control cooling device, the head and tail ends in the longitudinal direction of the thick steel plate are restricted The amount of cooling water. 7. For the cooling method of thick steel plate as claimed in item 5 or 6 of the patent application scope, the head of the thick steel plate in the longitudinal direction of the head is controlled by a water quantity control means for a specified time to perform the head of the thick steel plate in the lengthwise direction. The amount of cooling water at the tail end is limited. 8. For a method for controlling cooling of a thick steel plate according to any one of claims 2, 4, 5, and 7, in which the front section of the above-mentioned controlled cooling device is provided with a shielding member in each section, the shielding member is provided in a thick The thickness of the steel plate width direction end of the steel plate width direction end is limited, the shielding member can independently shield the cooling water of the steel plate width direction end in each area and above and below. 9. For example, the method for controlling cooling of a thick steel plate according to item 8 of the scope of patent application, which includes means for measuring and controlling the temperature distribution of the width of the thick steel plate before cooling, and analyzes the temperature drop at the end of the width of the thick steel plate from the measured temperature distribution. And the distance from the end of the thick steel plate in the width direction of the steel plate where the temperature drop occurs. Based on the results, calculate the shielding amount of the shielding member and the number of cooling zones to be shielded. Control the shading component. 1 0. As for thick steel 52 in any one of the scope of patent application No. 3, 4, 6 and 7] 2 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 The method for controlling cooling of the plate, in which the measurement preparation The temperature distribution in the width direction of the thick steel plate before cooling is analyzed from the measured temperature distribution. The temperature drop in the width plate end of the thick steel plate and the distance to the width end of the plate in which temperature drop occurs are calculated based on the results. The shielding amount and cooling time of the shielding member in the cooling device are controlled based on the calculation result to control the speed of the shielding member and the through plate of the preliminary cooling device. 1 1. A thick steel plate is manufactured after hot rolling by controlled cooling by a controlled cooling method according to any one of claims 1 to 10 in the scope of patent application. 1 2. —The control cooling device for thick steel plates is a through-type control cooling device with a plurality of independent cooling zones. It is characterized in that each cooling zone can pass water with a cooling water volume density of 1200L / min · m2 or more, and A shielding member for limiting the amount of cooling water at both end portions of the thick steel plate in the width direction is provided in the front cooling zone. 1 3. — A control cooling device for a thick steel plate is a cooling device in which a pre-cooling device and a control cooling device are sequentially arranged behind a rolling mill, characterized in that the input water density of the pre-cooling device is less than 500L / min · m2 A shielding member is provided to limit the amount of cooling water at the ends on both sides in the width direction of the thick steel plate. Furthermore, the above-mentioned control cooling device is a through-type device with a plurality of independent cooling zones, and each cooling zone can perform cooling water density of 1200L / mi · Water passing above m2. 1 4. The cooling control device for thick steel plates according to item 12 or 13 of the scope of patent application, wherein the operation of the shielding member is controlled to uniformize the temperature distribution in the width direction of the thick steel plates. 1 5. According to 53 312 / Invention Specification (Supplement) / 93-08 / 93116860 200523046 of the thick steel plate in any one of the items 12 to 14 of the scope of the patent application, the cooling device is controlled, which has the longitudinal direction of the thick steel plate. The front end and the tail end use a signal to control the amount of water for a specified time. 16. The control cooling device for thick steel plates according to item 1, 2, 14 or 15 of the scope of patent application, wherein the above-mentioned control cooling device uses a fine-slit spray cooling nozzle. 17. For the control cooling device for thick steel plates according to item 1, 3, 14 or 15 of the scope of the patent application, the above-mentioned pre-cooling device uses a laminar flow cooling nozzle, and the above-mentioned control cooling device uses a slit-jet cooling nozzle. 1 8. If the control cooling device for a thick steel plate according to any one of the items 1, 2, 14, 15, and 16 in the scope of the application for a patent, the shielding member provided in the cooling section of the front section of the control cooling device may be-- The cooling water at the end in the width direction of the thick steel plate is independently shielded in each of the cooling areas and the upper and lower surfaces of the cooling areas. 1 9. The cooling control device for thick steel plates according to item 18 of the scope of patent application, which includes means for measuring and controlling the temperature distribution in the width direction of the thick steel plate before cooling, and analyzing the plate end in the width direction of the thick steel plate based on the measured temperature distribution. Means for reducing the temperature of the part and the distance to the end of the plate in the width direction of the thick steel plate where the temperature drop occurs, and based on the result, calculates the amount of shielding of the shielding member provided in each cooling zone in front of the cooling device and performs shielding The means for the number of cooling zones has a mechanism for controlling the shielding member according to the calculation result. 20. The cooling control device for a thick steel plate according to any one of items 1, 3, 14, 15, 15 and 17 in the scope of the patent application, which has a temperature distribution in the width direction of the thick steel plate before cooling using the above-mentioned preliminary cooling device. And the temperature drop at the end of the plate in the width direction of the thick steel plate based on the measured temperature distribution. 54] 2 / Invention (Supplement) / 93-08 / 931〗 6860 200523046 Means for measuring the distance between the end portions of the plate in the width direction, and means for calculating the shielding amount and cooling time of the shielding member using the preliminary cooling device based on the result, and controlling the shielding in the preliminary cooling device based on the calculation result Component and mechanism of plate speed. 2 1 · For the control cooling device for thick steel plates according to any one of the items 1, 2, 14, 15, 16, 16, 18, and 19 in the scope of patent application, a straightening machine is set before the above control cooling device. 2 2 · If the control cooling device for a thick steel plate according to any one of items 1, 3, 1, 4, 15, 17, and 20 in the scope of the patent application, a correction is provided between the above-mentioned preliminary cooling device and the above-mentioned control cooling device machine. 55 312 / Invention Specification (Supplement) / 93-08 / 93116860
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11148182B2 (en) 2017-03-31 2021-10-19 Nippon Steel Corporation Cooling device for hot rolled steel sheet and cooling method for the same
TWI690375B (en) * 2017-04-17 2020-04-11 日商日本製鐵股份有限公司 Cooling device for hot-rolled steel sheet, and method of cooling hot-rolled steel sheet

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EP1634657A1 (en) 2006-03-15
TWI286089B (en) 2007-09-01

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