JPS61127824A - Device for cooling lower surface of heated steel plate - Google Patents
Device for cooling lower surface of heated steel plateInfo
- Publication number
- JPS61127824A JPS61127824A JP24816784A JP24816784A JPS61127824A JP S61127824 A JPS61127824 A JP S61127824A JP 24816784 A JP24816784 A JP 24816784A JP 24816784 A JP24816784 A JP 24816784A JP S61127824 A JPS61127824 A JP S61127824A
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- water
- heated steel
- nozzle
- slit nozzle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は、加熱鋼板の下面冷却装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a lower surface cooling device for a heated steel plate.
熱間圧延された加熱鋼板の強度および靭性等を改善する
ために、その長手方向に水平に移動中の加熱鋼板の上面
および下面に冷却水を吹き付けて加熱鋼板を所定温屁に
冷却することは、従来から一般に行なわれている。In order to improve the strength, toughness, etc. of a hot rolled heated steel plate, it is possible to cool the heated steel plate to a predetermined temperature by spraying cooling water on the upper and lower surfaces of the heated steel plate while it is moving horizontally in the longitudinal direction. , has been commonly practiced for a long time.
加熱鋼板を所定温度に冷却するために、加熱鋼板の下面
に冷却水を吹き付けるだめの従来の下面冷却装置には、
第９図および第１０図に示されるものがある。In order to cool the heated steel plate to a predetermined temperature, a conventional bottom cooling device that sprays cooling water onto the bottom surface of the heated steel plate includes:
There are those shown in FIGS. 9 and 10.
第９図に示される下面冷却装置は、ローラクエンチ装置
のハイクエンチゾーンに使用されており、加熱鋼板１の
搬送ロール２間に設けられた、加熱鋼板１の下面に冷却
水を吹き付けるだめの、カラスの口ばし状のノズル（カ
ラス口ノズル）３と、ノズル３に冷却水を供給するため
のノズルヘッダ４とからなっており、カラス口ノズル３
から加熱鋼板１の下面に冷却水を吹き付けて加熱鋼板１
の下面を冷却する。The lower surface cooling device shown in FIG. 9 is used in the high quench zone of the roller quench device, and has a reservoir that sprays cooling water onto the lower surface of the heated steel plate 1, which is provided between the conveyor rolls 2 of the heated steel plate 1. It consists of a crow's beak-shaped nozzle (crow's mouth nozzle) 3 and a nozzle header 4 for supplying cooling water to the nozzle 3.
Cooling water is sprayed onto the bottom surface of the heated steel plate 1 from the heated steel plate 1.
cool the bottom surface of the
第１０図に示される下面冷却装置は、加熱鋼板〕の搬送
ロール５の周囲および加熱鋼板１の下面を覆うケーシン
グ６からなっており、ケーシング６内に冷却水を供給し
て、加熱鋼、板１の下面を冷却する。The lower surface cooling device shown in FIG. 10 consists of a casing 6 that covers the periphery of the conveyor roll 5 of the heated steel plate and the lower surface of the heated steel plate 1. Cool the bottom surface of 1.
しかし、第９図に示した下面冷却装置は、以下の問題点
を有する。即ち、ノズル３と加熱鋼板１の下面との間の
距離を５０．程度以下に設定しないと冷却効率が悪くな
る。しかし、このようにノズル３が加熱鋼板１の下面に
接近していると、加熱鋼板ｌに上下方向の曲りが生じた
場合にノズル３が加熱鋼板１に衝突して破損する。また
、ノズル３に供給する冷却水の圧力は、５〜１ ｏ Ｋ
ｇ／ｃｔＡの品玉にする必要があるので、多量の冷却水
を必要とする。さらに、加熱鋼板１の上面および下面に
同一条件で冷却水を吹き付けた場合、下面に吹き付けら
れた冷却水は、直ちに落下するために下面側の冷却水の
流量を上面側に比べて２〜３割増加させる必要がある。However, the bottom cooling device shown in FIG. 9 has the following problems. That is, the distance between the nozzle 3 and the lower surface of the heated steel plate 1 is set to 50. If it is not set below this level, the cooling efficiency will deteriorate. However, if the nozzle 3 is close to the lower surface of the heated steel plate 1 in this way, when the heated steel plate 1 bends in the vertical direction, the nozzle 3 collides with the heated steel plate 1 and is damaged. Moreover, the pressure of the cooling water supplied to the nozzle 3 is 5 to 1 o K.
Since it is necessary to produce a high quality product of g/ctA, a large amount of cooling water is required. Furthermore, when cooling water is sprayed on the top and bottom surfaces of the heated steel plate 1 under the same conditions, the cooling water sprayed on the bottom surface falls immediately, so the flow rate of the cooling water on the bottom surface side is 2 to 3 times higher than that on the top surface side. It is necessary to increase it by a percentage.
次に、第１０図に示した下面冷却装置には、以下の問題
点がある。即ち、この装置は、冷却能力、冷却均一性の
面で第９図に示した下面冷却装置より優れているが、ケ
ーシング６と加熱鋼板１との間の距離は、２０〜３０．
程度と狭いので、加熱鋼板に上下方向の曲りが生じた場
合にケーシング６が加熱鋼板１に衝突して破損する。ま
た、搬送ロール５は、水没しているのでそのメンテナン
スに問題がある。従って、特に、オンライン用には適さ
ない。Next, the bottom cooling device shown in FIG. 10 has the following problems. That is, although this device is superior to the bottom cooling device shown in FIG. 9 in terms of cooling capacity and cooling uniformity, the distance between the casing 6 and the heated steel plate 1 is 20 to 30 mm.
Since the heating steel plate is so narrow that if the heating steel plate bends in the vertical direction, the casing 6 will collide with the heating steel plate 1 and be damaged. Furthermore, since the transport roll 5 is submerged in water, there is a problem in its maintenance. Therefore, it is not particularly suitable for online use.
別の下面冷却装置として、特開昭５５−１５６，６１２
号公報に開示されるものがある。この装置は、第１１図
および第１２図に示されるように、加熱鋼板１の下方に
配置された、冷却水を収容するための水槽７と、水槽７
内に垂直に加熱鋼板１の板幅方向て配置された複数本の
円管ノズル８と、各円管ノズル８に冷却水を供給するた
めのノズルヘッダ９とからなる。各円管ノズル８の上端
は、水槽７内の水面下に位置している。As another lower surface cooling device, JP-A-55-156,612
There is something disclosed in the publication No. As shown in FIGS. 11 and 12, this device includes a water tank 7 disposed below a heating steel plate 1 for containing cooling water, and a water tank 7 disposed below a heating steel plate 1.
It consists of a plurality of circular tube nozzles 8 arranged vertically in the width direction of the heated steel plate 1, and a nozzle header 9 for supplying cooling water to each circular tube nozzle 8. The upper end of each circular tube nozzle 8 is located below the water surface in the water tank 7.
このように構成されているので、ノズルヘッダ９から円
管ノズル８に冷却水を供給すると、前記冷却水は、水槽
７内の冷却水と共に噴流水１０の形で加熱鋼板１の下面
に吹き付けられる。With this configuration, when cooling water is supplied from the nozzle header 9 to the circular tube nozzle 8, the cooling water is sprayed onto the lower surface of the heated steel plate 1 in the form of jet water 10 together with the cooling water in the water tank 7. .
上述した下面冷却装置によれば、円管ノズル８からの冷
却水の数倍の流量の冷却水を加熱鋼板１に吹き付けるこ
とができるので、その公使用する冷却水の流量を減少さ
せることができる。まだ、円管ノズル８と加熱鋼板１の
下面との間の距離を十分に長くとれるので、加熱鋼板ｌ
に上下方向の曲りが生じても円管ノズル８は破損されず
、メンテナンスも簡単である。According to the above-mentioned bottom cooling device, it is possible to spray the heating steel plate 1 with cooling water at a flow rate several times that of the cooling water from the circular tube nozzle 8, so the flow rate of the publicly used cooling water can be reduced. . Still, since the distance between the circular tube nozzle 8 and the lower surface of the heated steel plate 1 can be made sufficiently long, the heated steel plate l
The circular tube nozzle 8 is not damaged even if it is bent in the vertical direction, and maintenance is easy.
しかし、上述した下面冷却装置には、以下の問題点があ
る。即ち、この装置によって、水平方向に比軸的低速で
移動中の幅広の加熱鋼板の下面を冷却する場合には、板
幅方向の冷却が不均一となって温度むらが生じる。However, the above-described bottom cooling device has the following problems. That is, when this device cools the lower surface of a wide heated steel plate that is moving at a relatively low speed in the horizontal direction, the cooling in the width direction of the plate becomes non-uniform, resulting in temperature unevenness.
陀って、この発明の目的は、加熱鋼板の下面を均一にか
つ能率良く冷却することができる加熱鋼板の下面冷却装
置を提供することにある。Accordingly, it is an object of the present invention to provide a lower surface cooling device for a heated steel plate that can uniformly and efficiently cool the lower surface of the heated steel plate.
水平に横たわる加熱鋼板の下方に配置された、冷却水を
収容するための水槽と、前記水槽内に垂直に配置され、
前記加熱鋼板の幅方向と平行に伸びるスリットノズルと
、前記スリットノズルに冷却水を供給するためのノズル
ヘッダとからなり、前記スリットノズルの上端は、前記
水槽内の水面下に位置し、前記水槽は、前記水面と前記
加熱鋼板の下面との間の距離が１００藷以下になるよう
に配置され、前記スリットノズルは、その上端と前記水
面との間の距離が、５０〜１５０藺の範囲内になるよう
に配置されていることに特徴を有する。a water tank for accommodating cooling water disposed below a horizontally lying heated steel plate; a water tank disposed vertically within the water tank;
It consists of a slit nozzle extending parallel to the width direction of the heated steel plate and a nozzle header for supplying cooling water to the slit nozzle, and the upper end of the slit nozzle is located below the water surface in the water tank, and the upper end of the slit nozzle is located below the water surface in the water tank. The slit nozzle is arranged such that the distance between the water surface and the lower surface of the heated steel plate is 100 mm or less, and the distance between the upper end of the slit nozzle and the water surface is within the range of 50 to 150 mm. It is characterized by being arranged so that
次に、この発明を図面を参照しながら説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は、この発明の装置の一実施態様の断面図、第２
図は、同平面図である。FIG. 1 is a sectional view of one embodiment of the device of the present invention;
The figure is a plan view of the same.
第１図および第２図に示されるように、冷却水を収容す
るための水槽１１は、加熱鋼板ｌの下方に配置されてい
る。スリットノズル１２は、水槽１１の底壁を貫通して
垂直に加熱鋼板ｌの板幅方向に配置されている。スリッ
トノズル１２は、加熱鋼板１の板幅と実質的に同じ長さ
を有し、その上端は、水槽１１内の水面下に位置してい
る。ノズルヘッダ１３は、スリットノズル１２に冷却水
を供給する。As shown in FIGS. 1 and 2, a water tank 11 for storing cooling water is arranged below the heated steel plate l. The slit nozzle 12 penetrates the bottom wall of the water tank 11 and is arranged vertically in the width direction of the heated steel plate l. The slit nozzle 12 has a length substantially the same as the width of the heated steel plate 1, and its upper end is located below the water surface in the water tank 11. The nozzle header 13 supplies cooling water to the slit nozzle 12.
上述した、この発明の一実施態様においては、水槽１１
内に冷却水が満たされた状態で、ノズルヘッダ１３から
スリットノズル１２に冷却水を供給すると、スリットノ
ズル１２からの冷却水と、そして、水槽１１内に収容さ
れた冷却水の双方が、噴流水１４の形で、加熱鋼板１の
下面に実質的に垂直に吹き付けられ、かくして、加熱鋼
板ｌの下面は所定温度に冷却される。加熱鋼板上の下面
に吹き付けられた後の噴流水１４の全量は、水槽１１内
に回収される。そして、スリットノズル１２に供給され
た冷却水と実質的に同量の冷却水が、水槽１１からオー
バーフローする。In one embodiment of the present invention described above, the water tank 11
When cooling water is supplied from the nozzle header 13 to the slit nozzle 12 with cooling water filled in the water tank 11, both the cooling water from the slit nozzle 12 and the cooling water accommodated in the water tank 11 flow into a jet stream. In the form of water 14, it is sprayed substantially perpendicularly onto the lower surface of the heated steel plate 1, thus cooling the lower surface of the heated steel plate 1 to a predetermined temperature. The entire amount of the jet water 14 after being sprayed onto the lower surface of the heated steel plate is collected into the water tank 11. Then, substantially the same amount of cooling water as the cooling water supplied to the slit nozzle 12 overflows from the water tank 11.
この発明の装置によって、板厚３２Ｔｕ１の加熱鋼板の
下面を冷却したときの、スリットノズル１ｍ当りに供給
する冷却水の流量と、ぬれ長さく→との関係について調
べた。この結果を第１１図に示した従来装置（１）およ
び第１２図に示した従来装置（２）によって加熱鋼板の
下面を冷却した場合と合わせて第３図に示す。なお、従
来装置（１）、（２）において、冷却水の流量は、ノズ
ルヘッダ１ｍ当シに取り付けられた円管ノズルに供給す
る冷却水の流量である。また、前記ぬれ長さくχ）とは
、噴流水１４が加熱鋼板１の下面に衝突した後、前記下
面にそって流れる距離を示す。The relationship between the flow rate of cooling water supplied per 1 m of the slit nozzle and the wetting length was investigated when the lower surface of a heated steel plate having a thickness of 32 Tu1 was cooled using the apparatus of the present invention. The results are shown in FIG. 3 together with the case where the lower surface of the heated steel plate was cooled by the conventional device (1) shown in FIG. 11 and the conventional device (2) shown in FIG. 12. In the conventional devices (1) and (2), the flow rate of cooling water is the flow rate of cooling water supplied to a circular tube nozzle attached to 1 m of the nozzle header. The wetting length χ) indicates the distance that the jet water 14 flows along the lower surface of the heated steel plate 1 after colliding with the lower surface.
このときの試験条件は、次の通りであった。The test conditions at this time were as follows.
（１）本発明装置におけるスリットノズルのスリット幅
：５ｕ、
（２）本発明装置におけるスリットノズルの上端と水槽
内の水面との間の距離（Ｈ） ： ７５ ｙ、（３）加
熱鋼板の下面と水槽内の水面との間の距離（Ｂ） ：５
０ 、ｗａ。(1) Slit width of the slit nozzle in the device of the present invention: 5u, (2) Distance (H) between the upper end of the slit nozzle in the device of the present invention and the water surface in the water tank: 75 y, (3) Bottom surface of the heated steel plate Distance between and the water surface in the aquarium (B): 5
0, wa.
（４） 従来装置（１）における円管ノズルの内径ニ
アφ藷、
（５）従来装置（１）における円管ノズルの間隔：１１
肩濡、
（６）従来装置（２）における円管ノズルの内径：１３
φ關、
（７） 従来装置（２）における円管ノズルの間隔：
第３図か−ら明らかなように、本発明装置によればぬれ
長さく−）は、従来装置（１） 、 （２）に比べて長
い。(4) Inner diameter near φ of the circular tube nozzle in the conventional device (1), (5) Spacing between the circular tube nozzles in the conventional device (1): 11
(6) Inner diameter of circular tube nozzle in conventional device (2): 13
(7) Distance between circular tube nozzles in conventional device (2):
As is clear from FIG. 3, according to the apparatus of the present invention, the wetting length (-) is longer than that of the conventional apparatuses (1) and (2).
これは、従来装置においては、噴流水は、刃口熱鋼板の
下面に衝突した後、前記下面にそって円形状に流れて、
隣接する噴流水と干渉するからである。This is because in the conventional device, the jet water collides with the lower surface of the hot steel plate at the cutting edge, and then flows in a circular shape along the lower surface.
This is because it interferes with the adjacent jet water.
次に、上述の試験条件と同一の試験条件の蚕で板厚３２
龍の加熱鋼板の下面に噴流水を吹き付け。Next, using silkworms with a thickness of 32 mm under the same test conditions as above,
Spray a jet of water onto the underside of the heated steel plate of the dragon.
冷却を開始してから７秒間経過したときの、板幅中央部
１００．の範囲内の各点と、加熱鋼板の下面から５關内
部の前記各点における温度との関係について調べた。こ
の結果を第４図に示す。Board width center portion 100.7 seconds after cooling started. The relationship between each point within the range and the temperature at each of the five points inside the heated steel plate from the bottom surface was investigated. The results are shown in FIG.
第４図から明らかなように、本発明装置によれば、従来
装置（１） 、 （２）に比べて加熱鋼板をその板幅方
向に均一に冷却することができる。As is clear from FIG. 4, according to the apparatus of the present invention, the heated steel plate can be cooled more uniformly in the width direction of the heated steel plate than the conventional apparatuses (1) and (2).
次に、本発明装置によって、加熱鋼板の下面に噴流水を
吹き付けたときの、スリットノズルの上端と水槽内の水
面との間の距離（Ｈ）と、加熱鋼板下面の（−）点にお
ける噴流水の流速との関係について調べた。この結果を
第５図に示す。なお、前記（−）点とは、噴流水の中心
から加熱鋼板の下面長手方向に（−）だけ離れた位置を
示す。Next, when jet water is sprayed onto the lower surface of the heated steel plate by the device of the present invention, the distance (H) between the upper end of the slit nozzle and the water surface in the water tank, and the jet flow at the (-) point on the lower surface of the heated steel plate. We investigated the relationship with water flow velocity. The results are shown in FIG. Note that the above-mentioned (-) point indicates a position separated by (-) from the center of the jet water in the longitudinal direction of the lower surface of the heated steel plate.
このときの試犠条件は、次の通りでめった。The sacrificial conditions at this time were as follows.
（１）スリットノズル１７ＦＬ当りからの冷却水の流量
： ２５００ ｔ／ｍｉｎ 。(1) Flow rate of cooling water from slit nozzle 17FL: 2500 t/min.
（２）加熱鋼板の下面と水槽内の水面との間の距離（Ｂ
） ： ５０ ｍＪＱ
第５図に示されるように、スリットノズルの先端と水槽
内の水面との間の距離（Ｈ） ｆ ５０〜１５０闘の範
囲内に維持すると、加熱鋼板下面の（χ）点における噴
流水の流速は最大となって、冷却効果が最大となること
がわかる。(2) Distance between the bottom surface of the heating steel plate and the water surface in the water tank (B
): 50 mJQ As shown in Figure 5, if the distance (H) f between the tip of the slit nozzle and the water surface in the water tank is maintained within the range of 50 to 150 mJQ, the (χ) point on the bottom surface of the heated steel plate It can be seen that the flow velocity of the jet water is maximum at , and the cooling effect is maximum.
次に、本発明装置によって、加熱鋼板の下面に噴流水を
吹き付けたときの、加熱鋼板下面と水槽内の水面との間
の距離（Ｂ）と、加熱鋼板下面の（χ）、へにおける噴
流水の流速との関係について調べた。Next, when jet water is sprayed onto the lower surface of the heated steel plate by the apparatus of the present invention, the distance (B) between the lower surface of the heated steel plate and the water surface in the water tank, and the jet flow to (χ) of the lower surface of the heated steel plate. We investigated the relationship with water flow velocity.
この結果ｆ：第６図に示す。なお、前記（−）点の定義
は、第５図におけると同様である。The result f is shown in FIG. Note that the definition of the (-) point is the same as in FIG. 5.
このときの試験条件は、次の通りであった。The test conditions at this time were as follows.
（１） スリットノズル１ｍ当りからの冷却水の流量
二 ２ ５ ０ ｏ ｔ／ｍｔｎ 。(1) Flow rate of cooling water from 1 m of slit nozzle: 2250 ot/mtn.
（２） スリットノズルの上端と水槽内の水面との間
の距離（Ｈ） ： ７５．、
（３）加熱鋼板下面の（χ）点の距離：２００Ｕ。(2) Distance (H) between the upper end of the slit nozzle and the water surface in the aquarium: 75. , (3) Distance of point (χ) on the lower surface of the heated steel plate: 200U.
第６図から明らかなように、加熱鋼板下面と水面との間
の距離（Ｂ）を１００ｕ以下にすると、加熱鋼板下面の
（−）点における噴流水の流速は最大となって、冷却効
率が最大となることがわかる。As is clear from Fig. 6, when the distance (B) between the lower surface of the heated steel plate and the water surface is set to 100u or less, the flow velocity of the jet water at the (-) point on the lower surface of the heated steel plate becomes maximum, and the cooling efficiency increases. It can be seen that this is the maximum.
以上のことから、この発明においては、スリットノズル
の上端と水面との間の距離（Ｈ）を５０〜１５０闘の範
囲に限定し、そして、加熱鋼板下面と水槽内の水面との
間の距離ＣＢ）を１００羽以下の範囲に限定した。From the above, in this invention, the distance (H) between the upper end of the slit nozzle and the water surface is limited to a range of 50 to 150 mm, and the distance between the lower surface of the heated steel plate and the water surface in the water tank is CB) was limited to 100 birds or less.
この発明の、加熱鋼板の下面冷却装置を仕上圧延機の出
側に設置した状態を第７図および第８図に示す。第７図
および第８図に示される下面冷却装置は、第１図および
第２図に示した装置と基本的に同一であるが、この場合
、水槽１１は、搬送ロール１５間に設けられているエプ
ロン１６の周囲に配置されており、スリットノズル１２
は、その上端がエプロン１６から突出しない長さを有す
る。FIGS. 7 and 8 show a state in which the lower surface cooling device for heated steel sheets according to the present invention is installed on the exit side of a finishing rolling mill. The bottom cooling device shown in FIGS. 7 and 8 is basically the same as the device shown in FIGS. 1 and 2, but in this case, the water tank 11 is provided between the transport rolls 15. The slit nozzle 12 is arranged around the apron 16 where the slit nozzle 12
has a length such that its upper end does not protrude from the apron 16.
以上説明したように、この発明によれば、加熱鋼板の下
面を均一にかつ能率良く冷却することができるといった
有用な効果がもたらされる。As explained above, according to the present invention, the useful effect of being able to uniformly and efficiently cool the lower surface of the heated steel plate is brought about.
第１図は、この発明の一実施態様の断面図、第２図は、
同平面図、第３図は、冷却水の流量とぬれ長さくχ）と
の関係を示すグラフ、第４図は、板幅方向の各点と加熱
鋼板の下面から５１１１３内部の温度との関係を示すグ
ラフ、第５図は、スリットノズルの上端と水面との間の
距離（Ｈ）と加熱鋼板下面の（３）点における噴流水の
流速との関係を示すグラフ、第６図は、加熱鋼板下面と
水面との間の距ｉ！！１（Ｂ）と加熱鋼板の（−）点に
おける噴流水の流速との関係を示すグラフ、第７図は、
この発明の一実施態様を仕上圧延機に設置した状態を示
す断面図、第８図は、同平面図、第９図は、カラス口ノ
ズルを用いた下面冷却装置により加熱鋼板を冷却してい
る状態を示す断面図、第１０図は、ケーシングを用いた
下面冷却装置により加熱鋼板を冷却している状態を示す
断面図、第１１図は、従来装置の断面図、第１２１Ａは
、同平面図である。図面において。FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of an embodiment of the present invention.
The same plan view and Fig. 3 are graphs showing the relationship between the flow rate of cooling water and the wetting length χ), and Fig. 4 is a graph showing the relationship between each point in the plate width direction and the temperature inside 51113 from the bottom surface of the heated steel plate. 5 is a graph showing the relationship between the distance (H) between the upper end of the slit nozzle and the water surface and the flow velocity of jet water at point (3) on the lower surface of the heated steel plate, and FIG. Distance i between the lower surface of the steel plate and the water surface! ! Figure 7 is a graph showing the relationship between 1(B) and the flow velocity of jet water at the (-) point of the heated steel plate.
A sectional view showing an embodiment of the present invention installed in a finishing rolling mill, FIG. 8 is a plan view of the same, and FIG. 9 shows a heated steel plate being cooled by a bottom cooling device using a crow-mouth nozzle. 10 is a sectional view showing a heated steel plate being cooled by a bottom cooling device using a casing, FIG. 11 is a sectional view of a conventional device, and 121A is a plan view of the same. It is. In the drawing.
Claims (1)
収容するための水槽と、前記水槽内に垂直に配置され、
前記加熱鋼板の幅方向と平行に伸びるスリットノズルと
、前記スリットノズルに冷却水を供給するためのノズル
ヘッダとからなり、前記スリットノズルの上端は、前記
水槽内の水面下に位置し、前記水槽は、前記水面と前記
加熱鋼板の下面との間の距離が１００ｍｍ以下になるよ
うに配置され、前記スリットノズルは、その上端と前記
水面との間の距離が、５０〜１５０ｍｍの範囲内になる
ように配置され、前記スリットノズルは、前記水槽内に
収容された冷却水を噴流水の形で前記加熱鋼板の下面に
均一に吹き付け、かくして、前記加熱鋼板の下面を均一
に冷却することを特徴とする、加熱鋼板の下面冷却装置
。a water tank for accommodating cooling water disposed below a horizontally lying heated steel plate; a water tank disposed vertically within the water tank;
It consists of a slit nozzle extending parallel to the width direction of the heated steel plate and a nozzle header for supplying cooling water to the slit nozzle, and the upper end of the slit nozzle is located below the water surface in the water tank, and the upper end of the slit nozzle is located below the water surface in the water tank. is arranged such that the distance between the water surface and the lower surface of the heated steel plate is 100 mm or less, and the distance between the upper end of the slit nozzle and the water surface is within the range of 50 to 150 mm. The slit nozzle uniformly sprays the cooling water contained in the water tank in the form of jet water onto the lower surface of the heated steel plate, thereby uniformly cooling the lower surface of the heated steel plate. A cooling device for the bottom surface of a heated steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24816784A JPS61127824A (en) | 1984-11-26 | 1984-11-26 | Device for cooling lower surface of heated steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24816784A JPS61127824A (en) | 1984-11-26 | 1984-11-26 | Device for cooling lower surface of heated steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61127824A true JPS61127824A (en) | 1986-06-16 |
| JPS6326181B2 JPS6326181B2 (en) | 1988-05-28 |
Family
ID=17174211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24816784A Granted JPS61127824A (en) | 1984-11-26 | 1984-11-26 | Device for cooling lower surface of heated steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61127824A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10166023A (en) * | 1996-12-10 | 1998-06-23 | Nkk Corp | Device for cooling high-temperature steel sheet |
-
1984
- 1984-11-26 JP JP24816784A patent/JPS61127824A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10166023A (en) * | 1996-12-10 | 1998-06-23 | Nkk Corp | Device for cooling high-temperature steel sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6326181B2 (en) | 1988-05-28 |
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