JP4377832B2 - Steel plate top and bottom uniform cooling system - Google Patents
Steel plate top and bottom uniform cooling system Download PDFInfo
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Description
本発明は、圧延鋼板の上下面を均一に冷却する冷却装置に関するものである。 The present invention relates to a cooling device that uniformly cools the upper and lower surfaces of a rolled steel sheet.
材質・形状特性が均一で、機械的性質に優れた熱延鋼板を製造するためには、仕上圧延後の冷却過程で、その上下面を、板幅方向及び板厚方向にて均一に冷却する必要がある。 In order to produce hot-rolled steel sheets with uniform material and shape characteristics and excellent mechanical properties, the upper and lower surfaces are cooled uniformly in the sheet width direction and sheet thickness direction in the cooling process after finish rolling. There is a need.
通常、仕上圧延後、鋼板を、拘束ロールで拘束しつつ搬送する過程で冷却する際には、鋼板の板幅方向及び板厚方向における温度降下の均一性（冷却の均一性）を確保するため、拘束ロール間に配置した冷却装置から鋼板上下面に冷却水を噴射し、上下面を同時に冷却する方式が採用される（特許文献１及び２参照）。 Usually, after finishing rolling, when cooling the steel sheet while transporting it while restraining it with restraining rolls, to ensure the uniformity of temperature drop (cooling uniformity) in the sheet width direction and sheet thickness direction of the steel sheet A method of injecting cooling water onto the upper and lower surfaces of the steel sheet from a cooling device disposed between the restraining rolls and simultaneously cooling the upper and lower surfaces is employed (see Patent Documents 1 and 2).
しかし、鋼板の上面において、冷却水噴流が衝突する領域での冷却態様と、板上水が形成されて流れる領域での冷却態様は異なり、また、鋼板の下面では、板上水に相当する水層又は水流は存在しないので、冷却水噴流が衝突する領域での冷却態様と、冷却水噴流が衝突しない領域での冷却態様は異なっている。 However, in the upper surface of the steel sheet, the cooling mode in the region where the cooling water jet collides is different from the cooling mode in the region where the on-board water is formed and flows. Since there is no layer or water flow, the cooling mode in the region where the cooling water jet collides is different from the cooling mode in the region where the cooling water jet does not collide.
したがって、拘束ロール間に鋼板の上下面を冷却する冷却装置を配置しても、鋼板の冷却過程において、板幅方向及び板厚方向における冷却の均一性を確保することは容易ではない。 Therefore, even if a cooling device for cooling the upper and lower surfaces of the steel sheet is disposed between the restraining rolls, it is not easy to ensure the uniformity of cooling in the sheet width direction and the sheet thickness direction in the cooling process of the steel sheet.
特許文献１及び２には、このことを踏まえ、鋼板上側及び鋼板下側の冷却水ノズルの配列態様を工夫した冷却装置が開示されているが、この冷却装置においては、板上水の不均一な発生や、冷却水噴流同士の衝突により、上下面における冷却能力、及び、上下面間における冷却態様が必ずしも同じでなく、鋼板全体としての冷却の均一性が充分に確保されているとはいい難い。 Patent Documents 1 and 2 disclose a cooling device in which the arrangement of cooling water nozzles on the upper side and lower side of the steel plate is devised based on this fact. In this cooling device, the water on the plate is not uniform. It is said that the cooling capacity of the upper and lower surfaces and the cooling mode between the upper and lower surfaces are not necessarily the same due to the occurrence of the occurrence and the collision of the cooling water jets, and the cooling uniformity as a whole steel plate is sufficiently ensured. hard.
そこで、本発明者は、鋼板の冷却を拘束ロール間にて把握して均一冷却を達成すべく、拘束ロール間の鋼板表面積（冷却対象面積）に対する“冷却水噴流の衝突面積”の総和の割合（％）に着目し、この割合（％）を鋼板の上下面それぞれにおいて規定した冷却装置を、特許文献３にて提案した。
In view of this, the present inventor, in order to grasp the cooling of the steel sheet between the restraining rolls and achieve uniform cooling, the ratio of the sum total of the “collision area of the cooling water jet” to the steel sheet surface area (cooling target area) between the restraining rolls Focusing on (%),
この冷却装置によれば、鋼板の冷却を拘束ロール間で把握して、冷却開始から終了までの冷却過程を設計できるので、鋼板の冷却過程において、板幅方向及び板厚方向における冷却の均一性を、従来以上に確保できる。 According to this cooling device, it is possible to grasp the cooling of the steel sheet between the restraining rolls and design the cooling process from the start to the end of the cooling, so in the cooling process of the steel sheet, the cooling uniformity in the plate width direction and the plate thickness direction Can be ensured more than before.
しかし、上記冷却装置においては、ノズルの個数を増加する必要があるので、設備コストが多大となる。また、ノズル個数の増加に伴いノズル径を小さくしなければならないが、ノズル径が小さければノズル詰り発生の頻度が高まるので、ノズル詰り発生によるメンテナンス負荷も大きい。 However, in the cooling device, since it is necessary to increase the number of nozzles, the equipment cost increases. In addition, the nozzle diameter must be reduced as the number of nozzles increases, but if the nozzle diameter is small, the frequency of nozzle clogging increases, so the maintenance load due to nozzle clogging is also large.
したがって、鋼板の製造ライン上で、冷却装置が、常に安定した冷却性能を発揮するためには、上記課題を解決することが必要である。 Therefore, in order for the cooling device to always exhibit stable cooling performance on the steel sheet production line, it is necessary to solve the above problems.
本発明は、上記必要性に鑑み、仕上圧延後の鋼板の上下面を、板幅方向において均一に冷却して、より均一な材質・形状特性、及び、より優れた機械的性質を確保できる冷却装置を提供することを目的とする。 In view of the above-mentioned necessity, the present invention cools the upper and lower surfaces of the steel plate after finish rolling uniformly in the width direction of the plate to ensure more uniform material / shape characteristics and better mechanical properties. An object is to provide an apparatus.
特に、鋼板の板幅が大きい（例えば、２０００ｍｍ以上）場合、板上水の挙動は、板幅方向の温度分布に著しい影響を及ぼし、鋼板の板幅方向中央部と鋼板端部間の温度差縮小を阻害する要因となる。 In particular, when the plate width of the steel plate is large (for example, 2000 mm or more), the behavior of the water on the plate significantly affects the temperature distribution in the plate width direction, and the temperature difference between the plate width direction center portion of the steel plate and the steel plate end portion. It becomes a factor which inhibits reduction.
それ故、本発明は、特に、板上水の挙動を適確に制御し、鋼板の上面において板幅方向に均一冷却を達成し得る冷却装置を提供することを目的とする。 Therefore, an object of the present invention is to provide a cooling device that can control the behavior of water on the plate appropriately and achieve uniform cooling in the plate width direction on the upper surface of the steel plate.
噴射孔から噴射され鋼板の上面に衝突した冷却媒体は、衝突後、板上水となって、鋼板上面における非衝突部位を冷却する。即ち、鋼板上面は、冷却媒体の衝突による冷却（衝突域冷却）と、板上水による冷却（非衝突域冷却）とにより冷却される。 The cooling medium injected from the injection hole and colliding with the upper surface of the steel plate becomes the plate water after the collision, and cools the non-collision site on the upper surface of the steel plate. That is, the upper surface of the steel plate is cooled by cooling due to collision of the cooling medium (collision zone cooling) and cooling by water on the plate (non-collision zone cooling).
衝突域と非衝突域における冷却態様は異なり、しかも、搬送中の鋼板の上面に形成される板上水の挙動を適確に把握することは難く、かつ、板上水の厚さが異なれば、板上水が発揮する冷却能力も異なるから、鋼板上面での冷却態様は、板上水が存在しない鋼板下面での冷却態様に比べ複雑である。 The cooling mode in the collision zone and the non-collision zone is different, and it is difficult to accurately grasp the behavior of the on-board water formed on the upper surface of the steel plate being transported, and the thickness of the on-board water is different. Since the cooling capacity exhibited by the on-plate water is different, the cooling mode on the upper surface of the steel plate is more complicated than the cooling mode on the lower surface of the steel plate where no on-board water exists.
しかし、本発明者は、鋼板上面において温度降下の均一性（冷却の均一性）を従来以上に確保するためには、板上水の挙動を解明し、これを適確に制御することが重要であるとの発想に至り、板上水の挙動について鋭意調査した。 However, in order to ensure that the temperature drop uniformity (cooling uniformity) on the upper surface of the steel sheet is higher than the conventional level, it is important for the inventor to elucidate the behavior of the water on the plate and control it accurately. I came up with the idea that this was the case, and investigated the behavior of the water on the board.
本発明者は、まず、噴射孔を所定の間隔をおいて規則的に配列した冷却面を有する冷却水噴射装置を用い、冷却水量、上記冷却面の面積、及び、該冷却面と鋼板上面との間隔等を種々に変え、冷却への影響が大きい板上水の厚さとの相関を鋭意調査した。 The inventor first uses a cooling water injection device having a cooling surface in which injection holes are regularly arranged at a predetermined interval, the amount of cooling water, the area of the cooling surface, and the cooling surface and the steel plate upper surface. Various changes were made to the interval of the water, and the correlation with the thickness of the water on the plate, which has a large effect on cooling, was intensively investigated.
その結果、本発明者は、噴射孔を所定の間隔をおいて規則的に配列した冷却面と鋼板上面との間隔には、最適範囲があることを見いだした。 As a result, the present inventor has found that there is an optimum range for the interval between the cooling surface in which the injection holes are regularly arranged at a predetermined interval and the upper surface of the steel plate.
本発明は、上記知見に基づいてなされたもので、その要旨は以下のとおりである。 This invention was made | formed based on the said knowledge, and the summary is as follows.
（１） 複数の拘束ロール対で拘束されて搬送ライン上を搬送される鋼板の上下面に冷却媒体を噴射する鋼板の冷却装置において、
搬送ラインの上側に、冷却媒体を噴射する噴射孔を所定の間隔をおいて規則的に配列した冷却面を、鋼板上面からの距離Ｈが下記式を満たす位置に配置した
ことを特徴とする鋼板の上下面均一冷却装置。
Ｈ（ｍｍ）≦ａ（Ｑ・Ｗ・Ｌ）2＋ｂ（Ｑ・Ｗ・Ｌ）＋ｃ
ここで、Ｑ：鋼板上面に供給する水の水量密度（ｍ3／ｍ2・min）
Ｗ：鋼板の板幅（ｍｍ）
Ｌ：拘束ロール対間の距離（ｍ）
ａ、ｂ、ｃ：定数
(1) In a steel sheet cooling apparatus that injects a cooling medium onto the upper and lower surfaces of a steel sheet that is restrained by a plurality of restraining roll pairs and transported on a transport line,
A steel plate characterized in that a cooling surface in which injection holes for injecting a cooling medium are regularly arranged at a predetermined interval is disposed at a position where a distance H from the steel plate upper surface satisfies the following formula on the upper side of the conveying line. Uniform cooling device for upper and lower surfaces.
H (mm) ≦ a (Q · W · L) 2 + b (Q · W · L) + c
Where, Q: density of water supplied to the upper surface of the steel sheet (m 3 / m 2 · min)
W: Width of steel sheet (mm)
L: Distance between pair of restraining rolls (m)
a, b, c: constants
（２） 前記冷却面が、鋼板上面に形成される板上水の厚さを制御する厚さ制御機構を備えることを特徴とする前記（１）に記載の鋼板の均一冷却装置。 (2) The steel plate uniform cooling device according to (1), wherein the cooling surface includes a thickness control mechanism that controls the thickness of the on-plate water formed on the upper surface of the steel plate.
（３） 前記搬送ラインの下側に、冷却媒体が衝突する部位の面積が大きい広角噴射ノズルを所定の間隔をおいて規則的に配列したことを特徴とする前記（１）又は（２）に記載の鋼板の上下面均一冷却装置。 (3) In the above (1) or (2), wide-angle injection nozzles having a large area of a portion where the cooling medium collides are regularly arranged at predetermined intervals below the conveyance line. The upper and lower surface uniform cooling device of the steel sheet described.
（４） 前記冷却媒体が水又は気水であることを特徴とする前記（１）〜（３）のいずれかに記載の鋼板の上下面均一冷却装置。 (4) The upper and lower surface uniform cooling apparatus for steel sheets according to any one of (1) to (3), wherein the cooling medium is water or air.
本発明によれば、安定した冷却操業により、仕上圧延後の鋼板の上下面を、板幅方向にて均一に冷却することができる。 According to the present invention, the upper and lower surfaces of the steel plate after finish rolling can be uniformly cooled in the plate width direction by a stable cooling operation.
本発明は、搬送ラインの上側に、冷却媒体を噴射する噴射孔を所定の間隔をおいて規則的に配列した冷却面を、鋼板上面からの距離Ｈが下記式（１）を満たす位置に配置したことを特徴とする。
Ｈ（ｍｍ）≦ａ（Ｑ・Ｗ・Ｌ）2＋ｂ（Ｑ・Ｗ・Ｌ）＋ｃ …（１）
ここで、Ｑ：鋼板上面に供給する水の水量密度（ｍ3／ｍ2・min）
Ｗ：鋼板の板幅（ｍｍ）
Ｌ：拘束ロール対間の距離（ｍ）
ａ、ｂ、ｃ：定数
In the present invention, a cooling surface in which injection holes for injecting a cooling medium are regularly arranged at predetermined intervals on the upper side of the conveyance line is disposed at a position where the distance H from the upper surface of the steel plate satisfies the following formula (1). It is characterized by that.
H (mm) ≦ a (Q · W · L) 2 + b (Q · W · L) + c (1)
Where, Q: density of water supplied to the upper surface of the steel sheet (m 3 / m 2 · min)
W: Width of steel sheet (mm)
L: Distance between pair of restraining rolls (m)
a, b, c: constants
以下、本発明の特徴について図面に基づいて説明する。 The features of the present invention will be described below with reference to the drawings.
図１に、冷却装置を備えた鋼板製造設備列の一態様を示す。圧延機１から搬送ライン５上に、熱間矯正装置２を経て送り出された鋼板は、拘束ロール対３の間に配置した冷却装置４にて冷却される。
In FIG. 1, the one aspect | mode of the steel plate manufacturing equipment row | line | column provided with the cooling device is shown. The steel sheet fed from the rolling mill 1 onto the
冷却装置４は、搬送ライン５の上側に配置されて、鋼板の上面を冷却する上側ノズルボックス４ａと、搬送ライン５の下側に配置され、鋼板の下面を冷却する下側ノズル４ｂとで構成されている。
The cooling device 4 includes an upper nozzle box 4a that is disposed on the upper side of the
上側ノズルボックス４ａの鋼板に対向する下面（冷却面）は、鋼板の上面に冷却媒体を噴射する噴射孔が、板幅方向及び搬送方向において所定の間隔をもって規則的に配列されている。 On the lower surface (cooling surface) facing the steel plate of the upper nozzle box 4a, injection holes for injecting a cooling medium are regularly arranged on the upper surface of the steel plate with a predetermined interval in the plate width direction and the conveying direction.
そして、噴射孔から冷却媒体を噴射して鋼板を冷却する際、上側ノズルボックス４ａの下面（冷却面）を、上記式（１）を満たす位置に保持することが、前述したように、本発明の特徴である。 And, as described above, when the cooling medium is injected from the injection hole to cool the steel sheet, the lower surface (cooling surface) of the upper nozzle box 4a is held at a position satisfying the above formula (1). It is the feature.
本発明者は、噴射孔を所定の間隔をおいて規則的に配列した冷却面を有する冷却水噴射装置を用い、搬送ライン上で、図２に示す位置・寸法関係において、冷却への影響が大きい板上水厚さ（高さ）と冷却水量との関係、及び、上記板上水厚さ（高さ）が鋼板端部の冷却（温度降下）に及ぼす影響について調査した。その結果の一例を、図３に示す。 The present inventor uses a cooling water injection device having a cooling surface in which injection holes are regularly arranged at predetermined intervals, and has an influence on cooling in the position / size relationship shown in FIG. The relationship between the large plate water thickness (height) and the amount of cooling water, and the effect of the above plate water thickness (height) on the cooling (temperature drop) of the edge of the steel plate were investigated. An example of the result is shown in FIG.
図３に示すように、板上水の厚さ（高さ）は、噴射孔から噴射する水量（＝鋼板の冷却対象面積［Ｗ（鋼板の板幅）×Ｌ（拘束ロール対間の距離）］×水量密度［Ｑ］）の増加とともに増加する関係にあるところ、下記式（２）で数式化できることを見いだした。
Ｈ’（ｍｍ）＝−０．５１（Ｑ・Ｗ・Ｌ）2−９．４（Ｑ・Ｗ・Ｌ）
＋７．２ …（２）
As shown in FIG. 3, the thickness (height) of the water on the plate is the amount of water injected from the injection holes (= area to be cooled of the steel plate [W (plate width of the steel plate) × L (distance between the pair of restraining rolls)) ] × water density [Q]), it was found that it can be expressed by the following formula (2).
H ′ (mm) = − 0.51 (Q · W · L) 2 −9.4 (Q · W · L)
+7.2 (2)
また、さらに、板上水の厚さ（高さ）が、１００ｍｍ以上の範囲で、上記式（２）で定まるＨ’（ｍｍ）を超えると、鋼板端部での温度降下が著しくなることを見いだした。 Furthermore, when the thickness (height) of the on-plate water exceeds 100 mm or more and exceeds H ′ (mm) determined by the above formula (2), the temperature drop at the end of the steel plate becomes significant. I found it.
即ち、本発明によれば、冷却媒体を噴射する噴射孔を所定の間隔をおいて規則的に配列した冷却面を、鋼板上面からの距離Ｈが前記式（１）を満たす位置に配置し、板上水の厚さ（高さ）を板幅方向においてＨに維持するので、板幅方向における冷却媒体の衝突圧が均一化され、鋼板幅端部での温度降下を抑制できる。 That is, according to the present invention, the cooling surface in which the injection holes for injecting the cooling medium are regularly arranged at a predetermined interval is disposed at a position where the distance H from the upper surface of the steel sheet satisfies the formula (1), Since the thickness (height) of the on-plate water is maintained at H in the plate width direction, the collision pressure of the cooling medium in the plate width direction is made uniform, and the temperature drop at the steel plate width end can be suppressed.
この結果、鋼板上面を、板幅方向において、均一に冷却することができる。 As a result, the upper surface of the steel plate can be uniformly cooled in the plate width direction.
なお、水量が少ないときは、板幅方向における温度偏差も小さいので、本発明は、水量が６ｍ3／min以上の場合に、顕著な効果を発揮する。 When the amount of water is small, the temperature deviation in the plate width direction is also small, so that the present invention exhibits a remarkable effect when the amount of water is 6 m 3 / min or more.
本発明において、上記板上水の厚さ（高さ）Ｈは、上記冷却面に別途取付けた厚さ制御板で制御してもよい。なお、この場合、厚さ制御板は、噴射孔を保護する機能をも有することになる。 In the present invention, the thickness (height) H of the water on the plate may be controlled by a thickness control plate separately attached to the cooling surface. In this case, the thickness control plate also has a function of protecting the injection hole.
なお、上記Ｈは、上記（ａ）の一様化を確保する点で、６０ｍｍ以上が好ましく、また、上記（ｂ）の抑制を確実にする点で、１５０ｍｍ以下が好ましい。 The H is preferably 60 mm or more from the viewpoint of ensuring the uniformity of the above (a), and is preferably 150 mm or less from the viewpoint of ensuring the suppression of the above (b).
本発明者の調査結果によれば、板上水の厚さ（高さ）とＱ・Ｗ・Ｌを関係付ける関数は、２次関数が、測定曲線を適正に近似する点で最適である。なお、ａ、ｂ、及び、ｃは、測定曲線との関係で定まる定数である。 According to the inventor's investigation results, the function that relates the thickness (height) of the on-plate water and Q · W · L is optimal in that the quadratic function appropriately approximates the measurement curve. Note that a, b, and c are constants determined by the relationship with the measurement curve.
冷却媒体としては、所要の冷却能を有すればよく、特に特定の冷却媒体に限定されないが、水、気水（沸騰型、炭酸ガス、窒素ガス、不活性ガスとの混合型等がある）が好ましい。 The cooling medium only needs to have a required cooling capacity, and is not particularly limited to a specific cooling medium, but water, air (mixed with boiling type, carbon dioxide gas, nitrogen gas, inert gas, etc.) Is preferred.
冷却媒体を噴射する噴射孔の開口面積は、通常、一定とするが、開孔面積可変の噴射孔を用いてもよい。この噴射孔を用いると、冷却媒体の噴射量を容易に調整できる。 The opening area of the injection hole for injecting the cooling medium is usually constant, but an injection hole having a variable opening area may be used. When this injection hole is used, the injection amount of the cooling medium can be easily adjusted.
搬送ラインの下側には、冷却媒体を噴射する下側ノズル４ｂが、鋼板下面における冷却の均一性を確保するため、板幅方向及び搬送方向において、所定の間隔をおいて規則的に配列されている。 Below the transport line, lower nozzles 4b for injecting a cooling medium are regularly arranged at predetermined intervals in the plate width direction and the transport direction in order to ensure the uniformity of cooling on the lower surface of the steel plate. ing.
鋼板下面でのより均一な冷却を確保するため、噴射ノズルとして、冷却媒体が衝突する部位の面積が大きい広角噴射ノズルを使用することが好ましい。 In order to ensure more uniform cooling on the lower surface of the steel plate, it is preferable to use a wide-angle injection nozzle having a large area at the portion where the cooling medium collides as the injection nozzle.
この広角噴射ノズルを用いると、鋼板下面において、（ａ）冷却媒体が衝突しない非衝突部位の面積を少なくし、かつ、（ｂ）衝突部位と非衝突部位間の冷却態様の違いを極力解消することができる。 When this wide-angle injection nozzle is used, (a) the area of the non-collision part where the cooling medium does not collide is reduced on the lower surface of the steel plate, and (b) the difference in the cooling mode between the collision part and the non-collision part is minimized. be able to.
したがって、本発明によれば、板上水の厚さを板幅方向及び搬送方向において一定に維持し、鋼板上面を均一に冷却する冷却態様と、鋼板下面を均一に冷却する冷却とが相俟って、圧延後の鋼板の上下面を、板幅方向及び板厚方向にて、従来以上に均一に冷却することができる。 Therefore, according to the present invention, the thickness of the plate water is kept constant in the plate width direction and the conveying direction, and the cooling mode for uniformly cooling the upper surface of the steel plate and the cooling for uniformly cooling the lower surface of the steel plate are combined. Thus, the upper and lower surfaces of the rolled steel sheet can be cooled more uniformly than before in the sheet width direction and the sheet thickness direction.
次に、本発明の実施例について説明するが、実施例の条件は、本発明の実施可能性及び効果を確認するために採用した一条件例であり、本発明は、この一条件例に限定されるものではない。本発明は、本発明の要旨を逸脱せず、本発明の目的を達成する限りにおいて、種々の条件を採用し得るものである。 Next, examples of the present invention will be described. The conditions of the examples are one example of conditions adopted for confirming the feasibility and effects of the present invention, and the present invention is limited to this one example of conditions. Is not to be done. The present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.
（実施例）
本発明の冷却装置と従来方式の冷却装置を用いて、板幅３６００ｍｍ、板厚２２ｍｍの鋼板を、８６０℃から冷却し、鋼板中心部から端部にわたる冷却停止温度を測定した。なお、噴射孔からは、水温２５℃の水を水量密度１．３ｍ3／ｍ2・minで噴射した。その結果を、図４に示す。
(Example)
Using a cooling device of the present invention and a conventional cooling device, a steel plate having a plate width of 3600 mm and a plate thickness of 22 mm was cooled from 860 ° C., and the cooling stop temperature from the center to the end of the steel plate was measured. In addition, water with a water temperature of 25 ° C. was injected from the injection hole at a water density of 1.3 m 3 / m 2 · min. The result is shown in FIG.
図４から、本発明の場合（Ｈ＝１００ｍｍ）、中心部から１０００ｍｍ以内の範囲で冷却停止温度が平坦であり、かつ、１０００ｍｍ以上端部にかけての温度降下が顕著に抑制されていることが解かる。 FIG. 4 shows that in the case of the present invention (H = 100 mm), the cooling stop temperature is flat within the range of 1000 mm from the center, and the temperature drop toward the end of 1000 mm or more is remarkably suppressed. Karu.
即ち、本発明によれば、圧延後、鋼板の上下面を、板幅方向及び板厚方向において、従来以上に均一に冷却できることが解かる。 That is, according to the present invention, it is understood that the upper and lower surfaces of the steel sheet can be cooled more uniformly than before in the sheet width direction and the sheet thickness direction after rolling.
本発明によれば、安定した冷却操業により、仕上圧延後の鋼板の上下面を、板幅方向及び板厚方向にて均一に冷却することができる。したがって、本発明は、鉄鋼産業において利用可能性が極めて大きい発明である。 According to the present invention, the upper and lower surfaces of the steel plate after finish rolling can be uniformly cooled in the plate width direction and the plate thickness direction by a stable cooling operation. Therefore, the present invention is an invention that has extremely high applicability in the steel industry.
１ 圧延機
２ 熱間矯正装置
３ 拘束ロール対
４ 冷却装置
４ａ 上側ノズルボックス
４ｂ 下側ノズル
５ 搬送ライン
６ 鋼板
DESCRIPTION OF SYMBOLS 1 Rolling machine 2
Claims (4)
搬送ラインの上側に、冷却媒体を噴射する噴射孔を所定の間隔をおいて規則的に配列した冷却面を、鋼板上面からの距離Ｈが下記式を満たす位置に配置した
ことを特徴とする鋼板の上下面均一冷却装置。
Ｈ（ｍｍ）≦ａ（Ｑ・Ｗ・Ｌ）2＋ｂ（Ｑ・Ｗ・Ｌ）＋ｃ
ここで、Ｑ：鋼板上面に供給する水の水量密度（ｍ3／ｍ2・min）
Ｗ：鋼板の板幅（ｍｍ）
Ｌ：拘束ロール対間の距離（ｍ）
ａ、ｂ、ｃ：定数 In the steel sheet cooling device for injecting a cooling medium onto the upper and lower surfaces of the steel sheet that is restrained by a plurality of restraining roll pairs and transported on the transport line,
A steel plate characterized in that a cooling surface in which injection holes for injecting a cooling medium are regularly arranged at a predetermined interval is disposed at a position where a distance H from the steel plate upper surface satisfies the following formula on the upper side of the conveying line. Uniform cooling device for upper and lower surfaces.
H (mm) ≦ a (Q · W · L) 2 + b (Q · W · L) + c
Where, Q: density of water supplied to the upper surface of the steel sheet (m 3 / m 2 · min)
W: Width of steel sheet (mm)
L: Distance between pair of restraining rolls (m)
a, b, c: constants
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