200843875 九、發明說明： 【發明所肩之技術領域3 發明領域 本發明係有關於一種鋼板之冷卻控制方法，特別是有 5 關於一種進行熱軋後，由上下方向對處於高溫狀態之鋼板 進行水冷卻時使用之鋼板的冷卻控制装置及其方法。 【先前技術3 發明背景 近年來，關於鐵鋼用材料之品質要求如板厚度之精嫁 10 度、材質、表面成色等愈趨嚴格化，特別是在厚鋼板製造 中’採用以合金成分的削減及熱處理步驟的簡化等為目的 之線上(on line)控制進行之冷卻控制製程並予以實施。該線 上控制進行之冷卻控制製程係藉由在熱軋後，直接或在十 幾秒後以預定之冷卻速度，將處於高溫狀態之厚鋼板冷卻 15控制到預定之冷卻停止溫度，減少高價之合金成分的含有 量，得到目標之強度、韌性、剛性。一般，在該製程中， 係藉調整冷卻水量、水冷時間控制各個冷卻速度、冷卻停 止溫度。 使用於上述之冷卻控制之裝置_般係採用縫隙喷射 (slit jet)冷卻法、多嘴嘴嘴射(multi * je〇冷卻法，但是卻 有冷卻有效面積狹小、要經常維持在數毫米程度之板寬度 方向之缝隙間隔、還有適用場所等問題。一般係採用具有 廣泛之水量控制範圍之氣水冷卻嘴嘴，但為了鋼板的安全 且能均-的冷卻，宜具有高密度之喷嘴配列，然而，由於 5 200843875 喷嘴構成及複雜化，必須作成箱型之冷卻裝置。此種箱塑 之冷卻裝置係由水或空氣之集管直接將水或空氣供給到複 數之喷嘴之類型的喷嘴，具有構造簡單之優點。此種箱塑 冷卻裝置之喷嘴構成係如日本實用新型公開公報實開昭 5 63-111208所揭示者，於由具有各自獨立之冷卻水供水系統 之外側/内側集管所構成之冷卻裝置的外側集管之冷卻水 喷射面，排列配置複數之具有預定角度之節流部之漸擴喷 嘴’並於内側集管排列配置前端部具有尖細曲面之多數喷 嘴而可產生環狀衝突流之裝置，或如日本實用新型公開公 10報實開平1-135108所揭示者，提出一種將可同時直流與斜 流喷霧之漸擴噴嘴的吐出口之噴嘴孔口徑作成較直流導入 口之喷嘴孔口徑小，且斜流之導入口作成尖細狀，藉此即 使直流之壓力與前細狀斜流之壓力在同等壓力之條件下也 可得到良好之冷卻性能之方法。 15 【發明内容】 發明概要 然而，當壓縮空氣量時，喷霧器會變得不安定，而有 無法維持所期望之冷卻圖案的問題。特別是，當供給水壓 在低位時，空氣會進入水流通路，而產生喷霧器變不安定、 20也就是所謂的「暫停」現象，使冷卻變得非常不安定。 本發明係提供一種在熱軋後之鋼板的冷卻方法中，即 使係供給之水為低水量或低水壓的情況下，也可藉排除進 入到達冷卻裝置前端之流路之空氣，而得到安定之噴霧圖 案之鋼板的冷卻裴置、及使用該装置之冷卻方法，其要旨 6 200843875 如下 用以板冷㈣置，係將线與水齡作成噴霧 集管者’该冷卻裝置包含：用以供給空氣之空氣 、 /、该空氣集管連接，並於上部具有空、 於中間部且古〜、 J工礼V入口、 水之噴霧:水導人D、於下部具有用以噴出空氣及 、 吐出孔之複數噴嘴， 10 該水^前述嘴嘴之水導人口的周圍形成水集管，並且往 嘴之水水之配管之供給口的高度係設定為較前述喷 有抽氣門卩的回度低，又，於前述水之供給配管途中設 (2)〜種鋼 之控制冷部裳置， 流通至前述噴嘴， 板之冷卻方法，係使用如第（〇項記載 並且在鋼板之冷卻開始時，首先使空氣 其次，打開前述抽氣閥，大略同時將水 供給於前述水隼管 15 氣閥。 ’主要抽取配管中之空氣，然後關閉抽 (3) —種鋼板之冷卻方法，係使用如第（丨）項記載 之控制冷卻裝置，在鋼板冷卻結束，並停止空氣及水的流 通時，首先，停止水的流通，然後停止空氣流通。 圖式簡單說明 20 第1圖係本發明之鋼板冷卻裝置之概略構成圖。 第2圖係本發明之鋼板冷卻方法之控制流程圖。 第3圖係使用於本發明之鋼板冷卻裝置之喷射喷嘴之 概略構成圖。 7 200843875 C實方式舅 較佳實施例之詳細說明 首先，說明用以實施 第1图4太旅 牧鋼板之冷部裝置之概要。 θ明之空氣/水之二流體之冷卻妒置之概 略構成圖。請中，峨餘冷卻通 广冷卻裳置本則係由支持裝 =; 10 15 20 置^空氣集管3與水集管4,且於空氣集管= 贺射面汉置夕數排批置之空氣供給配管5，並於水集管之 冷卻水喷射面設置有多數排列鋪管之冷卻水噴射噴嘴6。該 贺射噴嘴如第3圖所示’於上部具有空氣導人π 12,並於立 中間部H)具有水之導入口13。而且，空氣與水在喷嘴内混 合，並由位於噴嘴下部之噴射孔喷霧。又，於空氣集管3之 空氣噴射面可貯存空氣，又，於水集管4之冷卻水噴射喷嘴 6之周圍可貯存冷卻水。水集管4具有用以供給冷卻水之冷 卻水供給配管7，該配管之出口的高度係位於較噴射噴嘴6 中間部之水之導入口低之位置。此在水停止時，水集管内 在較噴射喷嘴中間部之水的導入口上方則充滿空氣，但當 该範圍具有冷卻水供給配管之出口時，配管内之水會供給 到水集管内，且由於該水會再由喷嘴流出，因此在冷卻水 停止時之應答性變差，故為了避免此一情況，配管出口配 置於經常浸潰於水之喷射噴嘴中間部之水導入口下方之位 置。 又，在冷卻水供給配管7之途中’設有抽氣閥8。藉此 將進入配管内之空氣順利地排出。習知之使用空氣/水之 8 200843875 二流體之冷卻裝置中，由空氣供給系統送出之空氣量及空 氣壓、與由冷卻水供給系統送出之冷卻水量及冷卻水壓因 應於預先設定之冷卻速度而作調整，並控制以進行均一冷 卻。 5 然而，如前所述，當供給之水為低水量或低水壓等異 常事態發生時’冷卻水與空氣的混合比率變高，且空氣之 消費量變多，運轉成本高居不下，又當減少空氣量時，會 有噴霧變得不穩定，無法維持所期望之冷卻圖案之問題。 特別是，當供給水壓為低位時，空氣會進入水之流通路， 1〇喷霧會變得不安定，產生所謂的「暫停」現象，冷卻變得 非常不安定。對於此種情況，只要藉由空氣供給系統之根 本來控制供給空氣量及其壓力即可，但其中會產生大的時 滯，結果空氣量會過剩，產生冷卻不均一。 因此，本發明係當產纽種情科，可排除進入到達 ^冷卻裝置、即到達噴嘴前端之流路之空氣，並將冷卻水與 空氣之混合比率控制為-定。其具體之控制步驟則如第2圖 之控制流程圖㈣，首先藉與第i圖騎之冷卻裝置本體直 接連結之流體噴嘴控制機構（未圖示）的初期設定，令冷 卻水流量=0、空氣流量=0,並先將抽氣閱關閉。接著， 變更空氣流量設定値，將空氣流量設定為正常狀態。然後， 在設定冷卻水流量時，打開抽氣閥，同時將冷卻水流量設 定為正常狀態，並抽走水之供給配管到水集管之空氣，輕 定來自噴嘴之喷霧狀態，然後關閉抽氣間。亦可^用計: 益確保此段期間之時間。在該狀態下開始鋼板的冷卻，並 9 200843875 在正常狀態下實施鋼板冷卻控制。 然後，鋼板冷卻結束後，首先，停止水的流通， 停止空氣的流通。這是因為若水與空氣同時停止的 會逆流人线集㈣，並且水會之料路徑，’水 5有生鏽等問題。也就是說，由於當進行令冷卻水流^暫= 為零（〇)，並在該時間點令空氣流量為零（G)之操作時: 冷卻水會逆流到线室（錢滞留），阻塞喷嘴，因此通了常 以計時器調整冷卻水供給系統，然後進行令空氣流量為零 (〇)之操作。 文 10 産業上之可利用性 藉由本發明，可在厚鋼板之㈣冷卻巾，進行鋼板全 長無板魅曲之均'冷卻。 【圖式簡單說明】 第1圖係本發明之鋼板冷卻裝置之概略構成圖。 第2圖係本發明之鋼板冷卻方法之控制流程圖。 第3圖係使用於本發明之鋼板冷卻裝置之喷射喷嘴之 概略構成圖。 【主要元件符號說明】 1···冷卻裝置本體 2· · ·支持裝置 3···空氣集管 4···水集管 5···空氣供給配管 6···冷卻水喷射噴嘴 7· ··冷卻水供給配管 8.. .抽氣閥 10.. .中間部 12.. .空氣導入口 13. ··水導入口200843875 IX. INSTRUCTIONS: [Technical Field of the Invention] Field of the Invention The present invention relates to a method for controlling the cooling of a steel sheet, and in particular to a method for performing water-cutting on a steel sheet at a high temperature from the upper and lower sides after performing hot rolling. A cooling control device for a steel sheet used for cooling and a method therefor. [Prior Art 3] In recent years, the quality requirements for materials for iron and steel, such as the thickness of the sheet, 10 degrees, material, surface coloring, etc., have become stricter, especially in the manufacture of thick steel sheets. The simplification of the heat treatment step and the like is performed on the on-line control of the cooling control process. The on-line control cooling control process reduces the high-priced alloy by cooling the thick steel plate 15 at a high temperature state directly or after a dozen seconds at a predetermined cooling rate to a predetermined cooling stop temperature. The content of the component gives the strength, toughness, and rigidity of the target. Generally, in this process, each cooling rate and cooling stop temperature are controlled by adjusting the amount of cooling water and the water cooling time. The device used for the above-described cooling control uses a slit jet cooling method and a multi-mouth nozzle method (multi* je〇 cooling method, but has a cooling effective area and is often maintained at a level of several millimeters). The gap between the width direction and the applicable place. Generally, the gas-water cooling nozzle with a wide range of water control is used, but for the safe and uniform cooling of the steel sheet, it is preferable to have a high-density nozzle arrangement. Because of the composition and complexity of the nozzles of 200843875, it is necessary to make a box-type cooling device. The cooling device of this box is a nozzle of the type that directly supplies water or air to a plurality of nozzles by a water or air header, and has a structure. The nozzle structure of the box-shaped cooling device is disclosed in Japanese Patent Application Laid-Open No. Hei No. SHO-63-111208, which is composed of an external/inside header having independent cooling water supply systems. a cooling water spray surface of the outer header of the cooling device, and a plurality of divergent nozzles of a plurality of throttle portions having a predetermined angle are arranged and arranged on the inner side A device for arranging a plurality of nozzles having a sharp curved surface at the front end portion to generate a ring-shaped collision flow, or a method for simultaneously illuminating a direct current and a diagonal flow as disclosed in Japanese Laid-Open Patent Publication No. Hei 1-135108 The nozzle hole diameter of the discharge port of the diverging nozzle is made smaller than the nozzle hole diameter of the DC inlet port, and the inlet port of the oblique flow is made tapered, whereby even the pressure of the direct current is equal to the pressure of the front thin oblique flow. Under the conditions, good cooling performance can be obtained. 15 SUMMARY OF THE INVENTION However, when the amount of air is compressed, the atomizer becomes unstable and there is a problem that the desired cooling pattern cannot be maintained. Yes, when the supply water pressure is at a low level, the air will enter the water flow path, and the sprayer becomes unstable, and the so-called "pause" phenomenon causes the cooling to become very unstable. The present invention provides a heat in the heat. In the method of cooling the steel sheet after rolling, even if the water supplied is low in water or low in water pressure, it can be excluded from entering the flow path leading to the front end of the cooling device. The cooling device for obtaining a stable spray pattern of the steel sheet and the cooling method using the device, the gist of 6 200843875 is as follows for the plate cooling (four), the line and the water age are used as a spray collector' : for supplying air to the air, /, the air header is connected, and has an empty upper portion, an intermediate portion, an ancient ~, J Gongli V inlet, a water spray: a water guide D, and a lower portion for ejecting a plurality of nozzles for the air and the discharge hole, 10 a water collecting pipe formed around the water guiding population of the mouth, and a height of the supply port of the water pipe to the mouth is set to be higher than the aforementioned suction port 卩In the middle of the water supply piping, (2) ~ the controlled cold portion of the steel is placed, and the cooling method is applied to the nozzle, and the cooling method is used as described in the above (in the steel sheet) At the start of cooling, first, the air is first turned on, and the suction valve is opened, and water is supplied to the water valve of the water tube 15 at the same time. 'The main extraction of the air in the pipe, and then close the pumping (3) - the cooling method of the steel plate, using the control cooling device as described in item (丨), when the steel plate is cooled, and the flow of air and water is stopped, first Stop the flow of water and stop the air circulation. BRIEF DESCRIPTION OF THE DRAWINGS 20 Fig. 1 is a schematic configuration diagram of a steel plate cooling device of the present invention. Fig. 2 is a control flow chart of the steel sheet cooling method of the present invention. Fig. 3 is a schematic configuration view of an injection nozzle used in the steel plate cooling device of the present invention. 7 200843875 C. The detailed description of the preferred embodiment First, an outline of a cold-storage apparatus for implementing the solar steel sheet of Fig. 1 will be described. A schematic diagram of the cooling arrangement of the air/water two fluids. Please, the remaining cooling cooling and cooling cooling set is based on the support == 10 15 20 set the air header 3 and the water header 4, and in the air header = He shot surface Han set the number of rows The air supply pipe 5 is provided with a plurality of cooling water spray nozzles 6 arranged in the pipe on the cooling water spray surface of the water header. The white injection nozzle has a water introduction port 13 at the upper portion as shown in Fig. 3, and has a water introduction port 13 at the upper intermediate portion H). Moreover, air and water are mixed in the nozzle and sprayed by the injection holes located at the lower portion of the nozzle. Further, air can be stored on the air jetting surface of the air header 3, and cooling water can be stored around the cooling water spray nozzle 6 of the water header 4. The water collecting pipe 4 has a cooling water supply pipe 7 for supplying cooling water, and the height of the outlet of the pipe is located lower than the inlet of the water at the intermediate portion of the injection nozzle 6. When the water is stopped, the water inlet pipe is filled with air above the inlet of the water in the middle portion of the injection nozzle, but when the range has the outlet of the cooling water supply pipe, the water in the pipe is supplied into the water header, and Since the water flows out of the nozzle again, the responsiveness is deteriorated when the cooling water is stopped. Therefore, in order to avoid this, the pipe outlet is disposed at a position that is often immersed under the water introduction port at the intermediate portion of the water injection nozzle. Further, an exhaust valve 8 is provided in the middle of the cooling water supply pipe 7. Thereby, the air entering the piping is smoothly discharged. The use of air/water 8 200843875 In the two-fluid cooling device, the amount of air and air pressure sent by the air supply system, the amount of cooling water sent by the cooling water supply system, and the cooling water pressure are determined by the preset cooling rate. Make adjustments and control for uniform cooling. 5 However, as mentioned above, when the supply water is abnormal such as low water volume or low water pressure, the mixing ratio of cooling water to air becomes high, and the consumption of air increases, the running cost is high, and when it is reduced When the amount of air is applied, there is a problem that the spray becomes unstable and the desired cooling pattern cannot be maintained. In particular, when the supply water pressure is low, the air enters the water flow path, and the spray becomes unstable, causing a so-called "pause" phenomenon, and the cooling becomes extremely unstable. In this case, it is only necessary to control the amount of supplied air and its pressure by the air supply system, but a large time lag occurs, and as a result, the amount of air is excessive, resulting in uneven cooling. Therefore, the present invention can eliminate the air entering the cooling device, that is, the flow path reaching the front end of the nozzle, and control the mixing ratio of the cooling water and the air to be constant. The specific control step is as shown in the control flow chart (4) of Fig. 2. First, the initial setting of the fluid nozzle control mechanism (not shown) directly connected to the body of the cooling device of the i-th mount is such that the cooling water flow rate = 0, Air flow = 0, and the pumping is turned off first. Next, change the air flow setting 値 to set the air flow rate to the normal state. Then, when setting the flow rate of the cooling water, open the suction valve, set the flow rate of the cooling water to the normal state, and pump the water supply pipe to the air of the water header, lightly spray the spray from the nozzle, and then close the pumping. Air. Can also be used to calculate: Benefit to ensure the time of this period. In this state, the cooling of the steel sheet is started, and 9 200843875 the steel sheet cooling control is performed under normal conditions. Then, after the cooling of the steel sheet is completed, first, the flow of water is stopped, and the circulation of the air is stopped. This is because if the water and the air stop at the same time, the flow line will be reversed (4), and the water will have a material path, and the water 5 has problems such as rust. That is, since the operation is such that the cooling water flow is temporarily zero (〇) and the air flow is zero (G) at this time point: the cooling water flows back to the line chamber (money retention), blocking the nozzle Therefore, the cooling water supply system is often adjusted by a timer, and then the operation of making the air flow zero (〇) is performed. Article 10 Industrial Applicability According to the present invention, it is possible to perform the 'cooling of the entire length of the steel sheet without the slab of the slab in the (4) cooling towel of the thick steel plate. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic configuration diagram of a steel plate cooling device of the present invention. Fig. 2 is a control flow chart of the steel sheet cooling method of the present invention. Fig. 3 is a schematic configuration view of an injection nozzle used in the steel plate cooling device of the present invention. [Description of main component symbols] 1···Cooling device main body 2···Support device 3···Air header 4···Water header 5···Air supply pipe 6···Cooling water spray nozzle 7· ··Cooling water supply pipe 8...Pumping valve 10... Intermediate part 12... Air inlet port 13. ··Water inlet