JP2003193215A - Method and device for manufacturing hot-dip galvanized steel strip - Google Patents
Method and device for manufacturing hot-dip galvanized steel stripInfo
- Publication number
- JP2003193215A JP2003193215A JP2001392054A JP2001392054A JP2003193215A JP 2003193215 A JP2003193215 A JP 2003193215A JP 2001392054 A JP2001392054 A JP 2001392054A JP 2001392054 A JP2001392054 A JP 2001392054A JP 2003193215 A JP2003193215 A JP 2003193215A
- Authority
- JP
- Japan
- Prior art keywords
- steel strip
- galvanized steel
- liquid mist
- hot
- cooling device
- 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.)
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- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、適切な大きさの
スパングルを有する高品質な溶融亜鉛めっき鋼帯を製造
する、溶融亜鉛めっき鋼帯の製造方法および製造装置に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a hot-dip galvanized steel strip for producing a high-quality hot-dip galvanized steel strip having an appropriate size of spangle.
【０００２】[0002]
【従来の技術】連続溶融亜鉛めっき鋼帯の製造プロセス
により製造される溶融亜鉛めっき鋼帯の表面には、溶融
亜鉛めっき浴中に含まれる鉛やアルミニウムをはじめと
する浴中成分の量や、めっき鋼帯の冷却速度などに応じ
て、スパングルと呼ばれるモザイク状の模様が生成す
る。2. Description of the Related Art On the surface of a hot-dip galvanized steel strip manufactured by a continuous hot-dip galvanized steel strip manufacturing process, the amount of lead and aluminum in the hot-dip galvanizing bath and other components in the bath, A mosaic pattern called spangle is generated depending on the cooling rate of the plated steel strip.
【０００３】このスパングルの大きさは板厚、通板速
度、冷却開始温度、冷却速度などによって様々に変化す
るが、最終製品としての溶融亜鉛めっき鋼帯は、ユーザ
からの要望に応じてスパングルの大きさを微細にした
り、あるいは大きく粗くする等、様々な作り分けを行な
う必要がある。このため、所望の大きさのスパングルを
有する溶融亜鉛めっき鋼帯を製造する方法として、冷却
帯でめっき鋼帯にスリット噴流もしくは円管噴流の空気
を吹き付けて冷却する方法、また液体ミストノズルで水
や薬液を噴霧する方法が行われている。The size of the spangle varies depending on the plate thickness, the plate passing speed, the cooling start temperature, the cooling speed, etc., but the hot-dip galvanized steel strip as the final product is spangle-shaped according to the user's request. It is necessary to make various types such as making the size fine or making it large and rough. Therefore, as a method for producing a hot-dip galvanized steel strip having a spangle of a desired size, a method of cooling the galvanized steel strip by blowing air of a slit jet or a circular pipe jet to the galvanized steel strip in a cooling zone, or a liquid mist nozzle And the method of spraying the drug solution is performed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記の
ような従来技術には次のような問題がある。However, the above-mentioned conventional techniques have the following problems.
【０００５】スパングルを小さくするためにミストを使
用した場合には、冷却速度を上げようとするとミスト量
を増加させなければならず、この場合には互いのミスト
が凝集して大径化し、めっき鋼帯に接触する時には大き
な水滴となり、その跡が最終製品に残ってしまい、めっ
き鋼帯外観を損ねる原因となる問題があった。When mist is used to reduce spangles, the amount of mist must be increased in order to increase the cooling rate. In this case, mutual mist agglomerates to increase the diameter, resulting in plating. When it comes into contact with the steel strip, there is a problem that large water droplets are left, and the traces remain on the final product, which may impair the appearance of the plated steel strip.
【０００６】従って、この発明の目的は、上記のような
従来技術の問題点を解決し、めっき鋼帯のスパングルの
大きさを容易に制御できる、溶融亜鉛めっき鋼帯の製造
方法および製造装置を提供することにある。Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a method and an apparatus for manufacturing a hot-dip galvanized steel strip which can easily control the size of the spangle of the galvanized steel strip. To provide.
【０００７】[0007]
【発明を解決するための手段】本発明者等は、めっき鋼
帯面に液体ミストを適正な状態で噴霧し、所望の形態の
スパングルを得ることができる方法について検討を行っ
た。具体的には、噴霧された液体ミストの粒子がめっき
鋼帯面に到着するまでの間に合体する等の問題が引き起
こされる要因と、この要因を排除する方策について検討
を行った。DISCLOSURE OF THE INVENTION The inventors of the present invention have investigated a method of spraying liquid mist onto a plated steel strip surface in an appropriate state to obtain spangles having a desired shape. Specifically, we investigated factors that cause problems such as coalescence of sprayed liquid mist particles before they reach the plated steel strip surface, and measures to eliminate these factors.
【０００８】まず、液体ミストのめっき鋼帯面への適正
な噴霧を妨げる要因としては、下記のものがあることが
判った。First, it has been found that the following factors are factors that impede proper spraying of the liquid mist onto the plated steel strip surface.
【０００９】（１）めっき付着量を制御するガスワイピ
ングノズルの上方では、めっき鋼帯が上方に移動するた
めに随伴される空気流れが発生する。(1) Above the gas wiping nozzle, which controls the amount of coating adhered, an air flow is generated as the plated steel strip moves upward.
【００１０】（２）ポットなどの高温部分があるために
生じる対流いわゆるドラフト流れが発生して、この煙突
効果によりミストが凝集しやすくなる。(2) A convection so-called draft flow occurs due to a high-temperature portion such as a pot, and the mist is likely to aggregate due to the stack effect.
【００１１】（３）噴霧するミストを均一化させるため
に、ミスト噴霧用のノズルとめっき鋼帯の間隔を広げる
ことによりノズルから噴霧されるミストの粒径は調整で
きるが、ノズルから離れるにつれてミストの粒径は合体
して大きくなる。(3) In order to make the sprayed mist uniform, the particle size of the mist sprayed from the nozzle can be adjusted by widening the distance between the mist spraying nozzle and the plated steel strip. The particle size of the particles increases as they coalesce.
【００１２】そこで、これら要因を排除する方策につい
て検討した結果、めっき鋼帯面に上下２段の気体噴射部
からエア等の気体を噴射するとともに、その上下の気体
噴射部間でめっき鋼帯面に液体ミストを噴霧することに
より、以下の知見を得た。Then, as a result of studying the measures to eliminate these factors, a gas such as air is jetted from the upper and lower two gas jetting portions onto the galvanized steel strip surface, and the galvanized steel strip surface is provided between the upper and lower gas jetting portions. The following findings were obtained by spraying a liquid mist on.
【００１３】（１）上下の気体噴射部の間に形成される
静圧場、すなわち、ドラフト空気流れやめっき鋼帯の随
伴空気流れの影響が少ない領域内で液体ミストの噴霧が
なされることにより、噴霧された液体ミストをミスト粒
子の合体等を生じさせることなく適正な状態でめっき鋼
帯面に到達させることができる。(1) By spraying the liquid mist in the static pressure field formed between the upper and lower gas jet parts, that is, in the region where the influence of the draft air flow and the associated air flow of the plated steel strip is small. The sprayed liquid mist can reach the plated steel strip surface in an appropriate state without causing coalescence of mist particles and the like.
【００１４】（２）仮に液体ミスト粒子の合体等によっ
て粗大なミスト粒子がめっき鋼帯面に付着しても、この
ような粗大なミスト粒子は気体噴射部から噴射された気
体により除去される、という作用が得られ、これらの作
用によりめっき鋼帯面に液体ミストを適正な状態で噴霧
し、所望の形態のスパングルを得ることができる。(2) Even if coarse mist particles adhere to the surface of the plated steel strip due to coalescence of liquid mist particles or the like, such coarse mist particles are removed by the gas injected from the gas injection part. With these effects, liquid mist can be sprayed onto the surface of the plated steel strip in an appropriate state to obtain spangles in a desired form.
【００１５】この発明は、このような知見に基づきなさ
れたもので、下記を特徴とするものである。The present invention has been made on the basis of such findings, and is characterized by the following.
【００１６】請求項１記載の発明は、溶融亜鉛めっき浴
から上方に引き上げられためっき鋼帯の表面に液体ミス
トを吹き付けて、めっき鋼帯の冷却を行う溶融亜鉛めっ
き鋼帯の製造方法において、めっき浴上方の鋼帯パスラ
インの両側において、上下２段の気体噴射部からめっき
鋼帯面に気体を噴射するとともに、前記上下２段の気体
噴射部間の液体ミスト噴霧部からめっき鋼帯面に液体ミ
ストを噴霧することに特徴を有するものである。The invention according to claim 1 is a method for producing a hot-dip galvanized steel strip, in which a liquid mist is sprayed on the surface of the hot-dip galvanized steel strip that has been pulled upward to cool the galvanized steel strip. On both sides of the steel strip pass line above the plating bath, gas is jetted from the upper and lower two-stage gas jet parts to the plated steel strip surface, and the liquid mist spray portion between the upper and lower two-stage gas jet parts is placed on the plated steel strip surface. It is characterized by spraying a liquid mist on.
【００１７】請求項２記載の発明は、上下２段の気体噴
射部と前記気体噴射部間の液体ミスト噴霧部とを備えた
冷却装置が、鋼帯パスラインを挟んで対向しないように
して、鋼帯パスラインの両側に鋼帯パスラインに沿って
各複数基配置されることに特徴を有するものである。According to a second aspect of the present invention, the cooling device including the upper and lower two-stage gas injecting sections and the liquid mist spraying section between the gas injecting sections does not face each other across the steel strip pass line, It is characterized in that a plurality of bases are arranged along the steel strip pass line on both sides of the steel strip pass line.
【００１８】請求項３記載の発明は、冷却装置の上下２
段の気体噴射部の噴射先端位置と鋼帯パスラインとの間
隔を１０ｍｍ以上２００ｍｍ以下とし、且つ冷却装置を
ガスワイピングノズルの上方１０ｍ以内に設置すること
に特徴を有するものである。According to a third aspect of the invention, the upper and lower parts of the cooling device 2
It is characterized in that the interval between the injection tip position of the gas injecting section of the step and the steel strip pass line is 10 mm or more and 200 mm or less, and the cooling device is installed within 10 m above the gas wiping nozzle.
【００１９】請求項４記載の発明は、鋼帯パスラインの
冷却装置よりも上流側において、めっき鋼帯の温度を計
測し、めっき鋼帯を液体ミストの噴霧により溶融亜鉛め
っきの融点以上の温度から３００℃以下まで、５０℃／
秒以上の冷却速度で冷却することに特徴を有するもので
ある。According to a fourth aspect of the present invention, the temperature of the galvanized steel strip is measured upstream of the cooling device of the steel strip pass line, and the temperature of the galvanized steel strip is higher than the melting point of the hot dip galvanizing by spraying the liquid mist. To 300 ° C or below, 50 ° C /
It is characterized by cooling at a cooling rate of at least 2 seconds.
【００２０】請求項５記載の発明は、液体ミストに水を
使用し、液体ミストの粒径を１００ミクロン以下にする
とともに、めっき鋼帯幅方向の水量分布のバラツキが２
０％以内となるように液体ミストノズルを配列すること
に特徴を有するものである。According to a fifth aspect of the present invention, water is used as the liquid mist, the particle size of the liquid mist is 100 μm or less, and the variation in the water amount distribution in the width direction of the plated steel strip is 2.
The feature is that the liquid mist nozzles are arranged so as to be within 0%.
【００２１】請求項６記載の発明は、生成したスパング
ルの大きさを計測し、前記計測結果に基づいて液体ミス
ト量の制御を行なうことに特徴を有するものである。The invention according to claim 6 is characterized in that the size of the generated spangle is measured and the amount of liquid mist is controlled based on the measurement result.
【００２２】請求項７記載の発明は、溶融亜鉛めっき浴
から上方に引き上げられためっき鋼帯の表面に液体ミス
トを吹き付けて、めっき鋼帯の冷却を行う溶融亜鉛めっ
き鋼帯の製造装置において、めっき浴上方の鋼帯パスラ
インの両側に冷却装置が各１基以上配置され、前記冷却
装置は、めっき鋼帯面に気体を噴射する上下２段の気体
噴射部と、前記上下２段の気体噴射部間でめっき鋼帯面
に液体ミストを噴霧する液体ミスト噴霧部とを有するこ
とに特徴を有するものである。According to a seventh aspect of the present invention, there is provided a hot-dip galvanized steel strip manufacturing apparatus for cooling a galvanized steel strip by spraying a liquid mist on the surface of the galvanized steel strip pulled upward from a hot dip galvanizing bath. One or more cooling devices are arranged on both sides of the steel strip pass line above the plating bath, and the cooling device includes two upper and lower gas injection portions for injecting a gas onto the plated steel strip surface, and two upper and lower gas injection portions. It is characterized in that it has a liquid mist spraying section for spraying liquid mist on the plated steel strip surface between the spraying sections.
【００２３】請求項８記載の発明は、冷却装置を、鋼帯
パスラインを挟んで対向しないようにして、鋼帯パスラ
インの両側に前記鋼帯パスラインに沿って各複数基配置
したことに特徴を有するものである。According to an eighth aspect of the invention, a plurality of cooling devices are arranged on both sides of the steel strip pass line so as not to face each other with the steel strip pass line interposed therebetween. It has characteristics.
【００２４】[0024]
【発明の実施の形態】次に、この発明の実施態様を図面
を参照しながら説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.
【００２５】図１は、この発明の実施に供される連続溶
融亜鉛めっき設備の一実施形態を示す説明図、図２は、
図１に示した連続溶融亜鉛めっき設備のうちの冷却装置
の拡大図である。FIG. 1 is an explanatory view showing an embodiment of continuous hot-dip galvanizing equipment used for carrying out the present invention, and FIG.
It is an enlarged view of the cooling device of the continuous hot-dip galvanizing equipment shown in FIG.
【００２６】図１に示す連続溶融亜鉛めっき設備は、溶
融亜鉛ポット１と、溶融亜鉛ポット１の上方に設置され
た一対のガスワイピングノズル２と、ガスワイピングノ
ズル２の上方に設置された冷却装置３と、冷却装置３の
上方に設置された温度計４と、スパングル計測計５とを
備えている。冷却装置３は、上下２段の気体噴射部とこ
の気体噴射部間の液体ミスト噴霧部とを備えている。ガ
スワイピングノズル２は、溶融亜鉛ポット１から引き上
げためっき鋼帯６の表面に付着した溶融亜鉛を空気吹き
付けにより所定の付着量まで払拭する。The continuous hot-dip galvanizing equipment shown in FIG. 1 comprises a hot-dip zinc pot 1, a pair of gas wiping nozzles 2 installed above the hot-dip zinc pot 1, and a cooling device installed above the gas wiping nozzle 2. 3, a thermometer 4 installed above the cooling device 3, and a spangle measuring instrument 5. The cooling device 3 is provided with upper and lower two-stage gas injection parts and a liquid mist spraying part between the gas injection parts. The gas wiping nozzle 2 wipes the molten zinc adhering to the surface of the plated steel strip 6 pulled up from the molten zinc pot 1 by air blowing to a predetermined amount.
【００２７】図２に示すように、冷却装置３は、装置本
体３Ａと、装置本体３Ａに接続された空気供給管ｃと、
装置本体３Ａの上下に２段にめっき鋼帯６の幅方向に沿
って配置された気体噴射部としての空気吹出しスリット
ノズルａ、ｂとを有している。空気供給管ｃから空気を
供給して、空気吹出しスリットノズルａ、ｂからめっき
鋼帯６に向けて空気を噴射し、めっき鋼帯６を鋼帯パス
ラインに保持しつつ通板させる。装置本体３Ａの空気吹
出しスリットノズルａ、ｂの上下方向の間には、くぼみ
部分３Ｂが形成されている。くぼみ部分３Ｂには、液体
ミストの液体供給管ｄおよび液体ミストの空気供給管ｅ
の先端が互いに隣接して開口していて、これにより液体
ミスト噴霧部としての液体ミストノズルｆが形成されて
いる。液体供給管ｄに液体を、そして空気供給管ｅに空
気を同時に供給して、液体ミストノズルｆからめっき鋼
帯６に向けて液体ミストを噴霧し、これによって鋼帯６
を冷却する。As shown in FIG. 2, the cooling device 3 includes a device body 3A, an air supply pipe c connected to the device body 3A,
It has air blowing slit nozzles a and b as gas injection portions arranged in two steps above and below the apparatus main body 3A along the width direction of the plated steel strip 6. Air is supplied from the air supply pipe c, air is jetted from the air blowing slit nozzles a and b toward the plated steel strip 6, and the plated steel strip 6 is passed through the steel strip pass line while being held. A hollow portion 3B is formed between the air blowing slit nozzles a and b of the apparatus body 3A in the vertical direction. A liquid supply pipe d for liquid mist and an air supply pipe e for liquid mist are provided in the recessed portion 3B.
Of the liquid mist are opened adjacent to each other, thereby forming a liquid mist nozzle f as a liquid mist spraying section. Liquid is supplied to the liquid supply pipe d and air is simultaneously supplied to the air supply pipe e, and the liquid mist is sprayed from the liquid mist nozzle f toward the plated steel strip 6, whereby the steel strip 6
To cool.
【００２８】空気吹出しスリットノズルａ、ｂから、め
っき鋼帯６に向かって空気を噴射して、くぼみ部分３Ｂ
に流れの淀んだ静圧の高い部分を作り出せば、空気吹出
しスリットノズルａ、ｂからの噴流の方向転換による運
動量によってくぼみ部分３Ｂの空気を封じ込めることが
できる。これにより冷却装置３の空気吹出しスリットノ
ズルａ、ｂ間では、冷却装置３の外部の雰囲気ガスの流
れに関係なく、液体ミストノズルｆからの液体ミスト噴
霧が可能になる。Air is blown from the air blowing slit nozzles a and b toward the plated steel strip 6 to form the hollow portion 3B.
By creating a portion where the flow is stagnant and having a high static pressure, it is possible to confine the air in the recessed portion 3B by the momentum due to the direction change of the jets from the air blowing slit nozzles a and b. Thereby, between the air blowing slit nozzles a and b of the cooling device 3, liquid mist spraying from the liquid mist nozzle f is possible regardless of the flow of the atmospheric gas outside the cooling device 3.
【００２９】図１においては、２対の冷却装置３が鋼帯
パスラインを挟んで対向するように設けられているが、
冷却装置３の配置はこれに限らない。他の例として、図
１において冷却装置３は１対でもよいし、図３に示すよ
うに鋼帯パスラインの片側の冷却装置３を、鋼帯パスラ
インの他の片側の冷却装置３の中間位置に、鋼帯パスラ
インを挟んで対向しないように、すなわち、千鳥状に配
置されており、この方がよりよい。In FIG. 1, two pairs of cooling devices 3 are provided so as to face each other with the steel strip pass line interposed therebetween.
The arrangement of the cooling device 3 is not limited to this. As another example, one pair of cooling devices 3 in FIG. 1 may be used, or as shown in FIG. 3, one cooling device 3 on one side of the steel strip pass line may be an intermediate part of the cooling device 3 on the other side of the steel strip pass line. The positions are arranged so as not to face each other across the steel strip pass line, that is, in a staggered manner, which is better.
【００３０】温度計４には通常赤外線式の計測器が用い
られる。またスパングル計測計５には通常光学式のもの
が用いられる。As the thermometer 4, an infrared type measuring instrument is usually used. An optical type is usually used for the spangle measuring instrument 5.
【００３１】以下、上記設備構成を用いた、この発明法
の一実施形態を説明する。An embodiment of the method of the present invention using the above equipment configuration will be described below.
【００３２】めっき鋼帯６を溶融亜鉛ポット１のめっき
浴中を通板させ、ガスワイピングノズル２により、めっ
き鋼帯６の表面に付着した溶融亜鉛を空気吹き付けによ
り所定の付着量まで払拭してめっき付着量制御を行な
う。その後、各冷却装置３の上下２段の空気吹出しスリ
ットノズルａ、ｂからめっき鋼帯６に向けて鋼帯パスラ
インの両側から空気を噴射することにより、めっき鋼帯
６を鋼帯パスラインに保持しつつ通板させ、冷却装置３
の上下２段のスリットノズルａ、ｂ間の液体ミスト噴霧
部である液体ミストノズルｆから噴霧される液体ミスト
によってめっき鋼帯６を冷却する。The galvanized steel strip 6 is passed through the galvanizing bath of the molten zinc pot 1 and the gas wiping nozzle 2 wipes the molten zinc adhering to the surface of the galvanized steel strip 6 by air blowing to a predetermined amount. Control the amount of plating deposit. After that, by spraying air from both sides of the steel strip pass line toward the plated steel strip 6 from the air blowing slit nozzles a and b in the upper and lower two stages of each cooling device 3, the plated steel strip 6 is made into the steel strip pass line. Cooling device 3 by passing it while holding it
The plated steel strip 6 is cooled by the liquid mist sprayed from the liquid mist nozzle f which is the liquid mist spraying section between the upper and lower two-stage slit nozzles a and b.
【００３３】ここで、液体ミストノズルｆを冷却装置３
の空気吹出しスリットノズルａ、ｂ間に設置することに
より、めっき鋼帯通板に伴う雰囲気ガスの流れを遮断で
きるようになり、さらにドラフト流れなどの上方に流れ
る雰囲気ガスをも遮断することが可能になる。Here, the liquid mist nozzle f is connected to the cooling device 3
By installing between the air blowing slit nozzles a and b, it is possible to block the flow of atmospheric gas accompanying the plated steel strip passing plate, and it is also possible to block the upward flowing atmospheric gas such as draft flow. become.
【００３４】また、冷却装置３を鋼帯パスラインの両側
に鋼帯パスラインに沿って各複数基設けるとともに、鋼
帯パスラインを挟んで対向しないように設けることによ
り、めっき鋼帯６に鋼帯パスラインに対して若干の曲げ
を作用することになり、その結果めっき鋼帯６にその鋼
帯パスラインに対して垂直方向の変位成分を生じさせる
ことになる。板張力変動が発生した場合にはこの変位成
分を増減させることにより、張力変動を緩和する効果が
あり、めっき鋼帯６の振動低減を行なうことができる。
さらに、曲率の小さな曲げを繰り返すことにより、いわ
ゆる耳波、中延び、と呼ばれるような板形状不良があっ
ても、めっき鋼帯６を安定な位置に通板させることが可
能になる。Further, the cooling device 3 is provided on each side of the steel strip pass line along each of the steel strip pass lines, and the cooling device 3 is provided so as not to face each other with the steel strip pass line interposed therebetween. A slight bending is applied to the strip pass line, and as a result, a displacement component in the direction perpendicular to the strip pass line is generated in the plated steel strip 6. When the plate tension fluctuation occurs, by increasing or decreasing this displacement component, there is an effect of alleviating the tension fluctuation, and the vibration of the plated steel strip 6 can be reduced.
Further, by repeating bending with a small curvature, it is possible to pass the plated steel strip 6 to a stable position even if there is a plate shape defect such as so-called selvage wave or middle extension.
【００３５】冷却装置３に設置された液体ミストノズル
ｆから噴霧される液体ミストは水を使用することが好ま
しい。このミストの粒径は基本的には細かいほどスパン
グル粒径制御には有効であるが、１０ミクロンから１０
０ミクロンまでの粒径のミストを使うことが好ましい。
ミストの粒径が１００ミクロン以上になると、ミストの
液滴同士の凝集合体により大径化して冷却の不均一にと
もなうムラが生じて最終製品の表面性状に悪影響を及ぼ
すことになる。微細なミストの場合には、液体ミストノ
ズルｆとめっき鋼帯６を近づけることにより、冷却能力
が確保できればなんら問題は無い。The liquid mist sprayed from the liquid mist nozzle f installed in the cooling device 3 is preferably water. Basically, the finer the particle size of this mist, the more effective it is to control the spangle particle size, but it is from 10 microns to 10 microns.
It is preferred to use a mist of particle size up to 0 micron.
If the particle size of the mist is 100 μm or more, the mist droplets are aggregated and coalesced into a large size, causing unevenness due to uneven cooling, which adversely affects the surface properties of the final product. In the case of a fine mist, there is no problem if the cooling capacity can be secured by bringing the liquid mist nozzle f and the plated steel strip 6 close to each other.
【００３６】つまり、噴霧後の液滴が合体しないよう
に、めっき鋼帯６から最小限の距離で、しかもめっき鋼
帯板幅方向に均一冷却できるよう、液体ミストノズルｆ
を配列する。めっき鋼帯６から最小限の距離に液体ミス
トノズルｆを配列するために、めっき鋼帯６を冷却装置
３で振動低減を行って、且つめっき鋼帯６に板形状不良
があっても、安定な位置に通板させる必要がある。ただ
し、冷却装置３の上下２段の気体噴射部であるスリット
ノズルの噴射先端位置を鋼帯パスラインに近づけすぎる
と、板形状不良のめっき鋼帯が通板するに伴い、めっき
鋼帯６が冷却装置３に接触する危険性が高いので１０ｍ
ｍ以上離すことが好ましく、逆に２００ｍｍ以上になる
と冷却装置３のくぼみ部分３Ｂであるクッション部分の
空気を封じ込める効果が激減するため、冷却装置３の上
下のスリットノズル噴射先端位置と鋼帯パスラインとの
間隔は１０ｍｍ以上２００ｍｍ以下が好ましい。In other words, the liquid mist nozzle f is provided so that the droplets after spraying do not coalesce and can be uniformly cooled in the minimum distance from the plated steel strip 6 and in the width direction of the plated steel strip.
Array. In order to arrange the liquid mist nozzles f at the minimum distance from the plated steel strip 6, the vibration of the plated steel strip 6 is reduced by the cooling device 3, and even if the plated steel strip 6 has a defective plate shape, it is stable. It is necessary to pass the board to a proper position. However, if the injection tip positions of the slit nozzles, which are the upper and lower two-stage gas injecting portions of the cooling device 3, are brought too close to the steel strip pass line, the plated steel strip 6 will be deformed as the plated steel strip having a poor plate shape passes. 10m because there is a high risk of contact with the cooling device 3
It is preferable to separate them by m or more, and conversely, if the distance is 200 mm or more, the effect of enclosing air in the cushion portion, which is the hollow portion 3B of the cooling device 3, is drastically reduced. The distance between and is preferably 10 mm or more and 200 mm or less.
【００３７】ミスト量の増加を行なう時に、めっき鋼帯
上に液滴が付着する恐れがあるが、冷却装置３の空気吹
出しスリットノズルａ、ｂから噴射された空気により、
めっき鋼帯に付着した液滴を全部飛ばすことができ、そ
の結果、めっき鋼帯６にミストが残ることによって生じ
る表面ムラの発生を防止できる。この吹き飛ばす速度が
速ければ速いほど、跳ね飛ばされた液滴は小さくなり、
再付着した場合でも問題無いようにするためには冷却装
置３の空気吹出しスリットノズルの流速は１００ｍ／秒
以上とするのが好ましい。When the amount of mist is increased, droplets may adhere to the plated steel strip. However, due to the air blown from the air blowing slit nozzles a and b of the cooling device 3,
All the droplets attached to the plated steel strip can be ejected, and as a result, it is possible to prevent the occurrence of surface unevenness caused by the mist remaining on the plated steel strip 6. The faster this blow-off speed, the smaller the splashed droplets,
The flow velocity of the air blowing slit nozzle of the cooling device 3 is preferably 100 m / sec or more in order to prevent a problem even when reattached.
【００３８】液体ミストの噴霧によりめっき鋼帯が溶融
亜鉛めっきの融点以上の温度から、３００℃以下にまで
冷却するのに、冷却速度が５０℃／秒以上になるよう液
体ミスト量を確保することが好ましい。また、３００℃
以下のめっき鋼帯温度まで、冷却速度のバラツキが１５
％以内にすることで、製品のスパングルの大きさが均一
であると目視観察されるようになり、そのためには液体
ミストのめっき鋼帯幅方向の水量分布のバラツキは、数
多くの実機試験結果から好ましくは２０％以内になるよ
うに液体ミストノズルの配置間隔や水量範囲を調整する
必要がある。To cool the coated steel strip from the temperature above the melting point of the hot dip galvanized to 300 ° C. or less by spraying the liquid mist, ensure the liquid mist amount so that the cooling rate is 50 ° C./sec or more. Is preferred. Also, 300 ℃
Up to the following galvanized steel strip temperatures, the variation in cooling rate is 15
By setting the content to be within the%, it becomes possible to visually observe that the spangle size of the product is uniform. For that reason, the variation in the water amount distribution of the liquid mist in the width direction of the plated steel strip can be confirmed from the results of many actual equipment tests. It is necessary to adjust the arrangement interval of the liquid mist nozzles and the water amount range so that it is preferably within 20%.
【００３９】上記の確認は、冷却装置３の上方に設置し
た光学式のスパングル計測計５および、赤外線を利用し
た温度計４からのデータで確認する。さらに、ＰＤＩ制
御などを用いて、計測されたデータを基に、所要のスパ
ングルサイズになるよう液体ミスト量等の操業条件を制
御する。The above confirmation is confirmed by the data from the optical spangle measuring instrument 5 installed above the cooling device 3 and the thermometer 4 utilizing infrared rays. Further, PDI control or the like is used to control operating conditions such as the amount of liquid mist based on the measured data so that the required spangle size is achieved.
【００４０】さらに、冷却装置３は、めっき鋼帯の表面
が凝固してからはスパングル粒径制御ができないため、
表面の溶融亜鉛めっきが完全凝固する前のガスワイピン
グノズルの上方約１０ｍ以内に設置することが望まし
い。Further, in the cooling device 3, since the spangle particle size cannot be controlled after the surface of the plated steel strip is solidified,
It is desirable to install it within about 10 m above the gas wiping nozzle before the hot dip galvanizing of the surface is completely solidified.
【００４１】例えば、モニターテレビにより画像処理す
るめっき鋼帯エッジ検出装置によりめっき鋼帯の位置を
検出して、冷却装置３の空気吹出しスリットノズルａ、
ｂから噴射する空気の吹出す領域をめっき鋼帯の幅方向
内に限定することが好ましい。制御方法としては冷却装
置３の空気吹出しスリットノズルａ、ｂのエッジ部分に
１００ｍｍピッチ毎に仕切りを入れて、めっき鋼帯の存
在しない部分への空気の吹出しが無くなるようにスリッ
トノズルの仕切りを開閉する等の制御を行なう。さら
に、このめっき鋼帯エッジ検出装置を液体ミストノズル
fに組み込んで、めっき鋼帯の存在しない部分での液体
ミストの噴霧をしないようにすることが好ましい。For example, the position of the coated steel strip is detected by a coated steel strip edge detection device for image processing on a monitor television, and the air blowing slit nozzle a of the cooling device 3,
It is preferable to limit the region where the air jetted from b is blown out within the width direction of the plated steel strip. As a control method, partitions are put at the edge portions of the air-blowing slit nozzles a and b of the cooling device 3 for every 100 mm pitch, and the partitions of the slit nozzles are opened and closed so that air is not blown to the portion where the plated steel strip does not exist. Control. Furthermore, this plated steel strip edge detection device is equipped with a liquid mist nozzle.
It is preferable that it is incorporated in f so that the liquid mist is not sprayed in the portion where the plated steel strip does not exist.
【００４２】[0042]
【実施例】次に、この発明を実施例によりさらに説明す
る。Next, the present invention will be further described with reference to examples.
【００４３】図３に示す連続溶融亜鉛めっき設備を用い
て、溶融亜鉛めっき鋼帯の製造を行った。冷却装置３の
上下のスリットノズル噴射先端位置と鋼帯パスラインと
の間隔は２０ｍｍとした。この冷却装置は板幅方向には
最大通板の板幅１６００ｍｍよりも大きく、めっき鋼帯
の蛇行を考慮して１８００ｍｍとし、鋼帯パスラインに
は長さ５００ｍｍ、深さ１５０ｍｍのくぼみ部分を形成
した。この冷却装置を、鋼帯パスラインを挟んで対向し
ないように鋼帯パスラインに沿って３基設置した。Using the continuous hot-dip galvanizing equipment shown in FIG. 3, hot-dip galvanized steel strip was manufactured. The distance between the upper and lower slit nozzle jetting positions of the cooling device 3 and the steel strip pass line was set to 20 mm. This cooling device is larger than the maximum plate width of 1600 mm in the plate width direction, and is 1800 mm considering the meandering of the plated steel strip. The steel strip pass line has a recessed portion with a length of 500 mm and a depth of 150 mm. did. Three cooling devices were installed along the steel strip pass line so as not to face each other across the steel strip pass line.
【００４４】この冷却装置のくぼみ部分の下方に位置す
る場所に液体ミストノズルｆをめっき鋼帯幅方向に３０
ｍｍピッチで５５個組み込んだ。冷却装置の空気吹出し
スリットノズルのスリット幅を３ｍｍとし、これを冷却
装置上下２段に１５０ｍｍ隔てて２箇所配置した。吹出
す空気流速を１００ｍ／秒とし、液体ミストの液体供給
管からは１つの冷却装置あたり毎分６リッターから６０
０リッターの液体供給を可能とした。スパングル制御は
トップロール近傍にあるＩＴＶを使用したスパングル計
測計によりスパングルの大きさを計測し、冷却装置の上
方に設置した赤外線温度計でめっき鋼帯温度を計測し
て、目的のスパングルサイズになるよう液体ミストの水
量および空気量を制御した。ただし、めっき鋼帯の板厚
が薄い場合には、目標とするスパングルサイズを下回る
ことがあり、その場合には冷却装置の空気吹出しスリッ
トノズルからの空気の流速を１００ｍ／秒から３０ｍ／
秒にまで減速して制御した。A liquid mist nozzle f is provided at a position below the hollow portion of this cooling device in the width direction of the coated steel strip 30.
55 pieces were installed at mm pitch. The slit width of the air-blowing slit nozzle of the cooling device was set to 3 mm, and the slit width was arranged in two places in the upper and lower two stages of the cooling device with a 150 mm gap. The blowing air velocity was 100 m / sec, and from the liquid supply pipe of the liquid mist, from 6 liters per minute to 60 per cooling device.
A liquid supply of 0 liter was made possible. For spangle control, the size of the spangle is measured by a spangle measuring instrument using ITV near the top roll, and the temperature of the plated steel strip is measured by an infrared thermometer installed above the cooling device to obtain the desired spangle size. The water and air content of the liquid mist was controlled. However, when the plate thickness of the plated steel strip is thin, it may fall below the target spangle size. In that case, the flow velocity of air from the air blowing slit nozzle of the cooling device is 100 m / sec to 30 m / sec.
The speed was controlled down to the second.
【００４５】その結果、液体ミストによる冷却効果は十
分にあることが確認できた。さらに、従来、液体ミスト
を吹き付けた場合に発生する液滴跡は、冷却装置のスリ
ットノズルから噴射される空気によって全て除去される
ために目視観察で欠陥は見られなかった。As a result, it was confirmed that the liquid mist has a sufficient cooling effect. Further, conventionally, all traces of liquid droplets generated when the liquid mist is sprayed are removed by the air jetted from the slit nozzle of the cooling device, and therefore no defect is visually observed.
【００４６】[0046]
【発明の効果】以上述べたように、この発明によれば、
従来、経験に頼っていた溶融亜鉛めっき鋼帯のスパング
ル粒径の制御を、経験に頼ることなく容易に、且つ確実
に行なえるようになり、しかも、スパングル異常による
歩留まり低下が生産量に対する割合で０．５％以下とな
り、溶融亜鉛めっき鋼帯の品質向上と歩留まり向上が達
成できるといった有用な効果がもたらされる。As described above, according to the present invention,
The spangle grain size of hot-dip galvanized steel strips, which had previously relied on experience, can now be controlled easily and reliably without relying on experience.Moreover, the yield loss due to spangle abnormalities is proportional to the production amount. The content of 0.5% or less brings about a useful effect that the quality and yield of the hot-dip galvanized steel strip can be improved.
【図１】この発明の実施に供される連続溶融亜鉛めっき
設備の一実施形態を示す説明図である。FIG. 1 is an explanatory view showing an embodiment of a continuous hot-dip galvanizing facility used for carrying out the present invention.
【図２】冷却装置の拡大図である。FIG. 2 is an enlarged view of a cooling device.
【図３】この発明の実施例に供される連続溶融亜鉛めっ
き設備を示す説明図である。FIG. 3 is an explanatory diagram showing a continuous hot-dip galvanizing facility used in an example of the present invention.
１：溶融亜鉛ポット ２：ガスワイピングノズル ３：冷却装置 ４：温度計 ５：スパングル計測計 ６：めっき鋼帯 ａ、ｂ：空気吹出しスリットノズル ｃ：空気供給管 ｄ：液体ミストの液体供給管 ｅ：液体ミストの空気供給管 ｆ：液体ミストノズル 1: Molten zinc pot 2: Gas wiping nozzle 3: Cooling device 4: Thermometer 5: Spangle measuring instrument 6: Plated steel strip a, b: Air blowing slit nozzle c: Air supply pipe d: Liquid supply pipe for liquid mist e: Air supply pipe for liquid mist f: Liquid mist nozzle
───────────────────────────────────────────────────── フロントページの続き (72)発明者 青葉 一樹 神奈川県川崎市川崎区水江町６−１ エヌ ケーケー鋼板株式会社内 Ｆターム(参考） 4K027 AA05 AA22 AB15 AB42 AC72 AD21 AD22 AD26 AD27 AE12 AE25 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Kazuki Aoba 6-1 N, Mizue-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa KK Steel Co., Ltd. F term (reference) 4K027 AA05 AA22 AB15 AB42 AC72 AD21 AD22 AD26 AD27 AE12 AE25
Claims (8)
れためっき鋼帯の表面に液体ミストを吹き付けて、めっ
き鋼帯の冷却を行う溶融亜鉛めっき鋼帯の製造方法にお
いて、 めっき浴上方の鋼帯パスラインの両側において、上下２
段の気体噴射部からめっき鋼帯面に気体を噴射するとと
もに、前記上下２段の気体噴射部間の液体ミスト噴霧部
からめっき鋼帯面に液体ミストを噴霧することを特徴と
する、溶融亜鉛めっき鋼帯の製造方法。1. A method for producing a galvanized steel strip, which comprises cooling a galvanized steel strip by spraying a liquid mist on the surface of the galvanized steel strip pulled upward from the galvanizing bath, wherein the steel strip above the galvanizing bath is used. 2 on each side of the pass line
A molten zinc, characterized in that a gas is jetted from the gas jetting section of the step to the galvanized steel strip surface and the liquid mist is sprayed from the liquid mist spraying section between the gas jetting sections of the upper and lower two steps to the galvanized steel strip surface. Method for producing galvanized steel strip.
間の液体ミスト噴霧部とを備えた冷却装置が、鋼帯パス
ラインを挟んで対向しないようにして、鋼帯パスライン
の両側に鋼帯パスラインに沿って各複数基配置されるこ
とを特徴とする請求項１記載の、溶融亜鉛めっき鋼帯の
製造方法。2. A cooling device provided with two upper and lower gas jetting sections and a liquid mist spraying section between the gas jetting sections is arranged so as not to face each other across the steel strip pass line, and both sides of the steel strip pass line. 2. A method for manufacturing a hot-dip galvanized steel strip according to claim 1, wherein a plurality of bases are arranged along the steel strip pass line.
先端位置と鋼帯パスラインとの間隔を１０ｍｍ以上２０
０ｍｍ以下とし、且つ冷却装置をガスワイピングノズル
の上方１０ｍ以内に設置することを特徴とする請求項１
または２記載の、溶融亜鉛めっき鋼帯の製造方法。3. The distance between the injection tip positions of the upper and lower gas injection parts of the cooling device and the steel strip pass line is 10 mm or more and 20 or more.
The cooling device is set to 0 mm or less, and the cooling device is installed within 10 m above the gas wiping nozzle.
Alternatively, the method for producing a hot-dip galvanized steel strip according to item 2.
において、めっき鋼帯の温度を計測し、めっき鋼帯を液
体ミストの噴霧により溶融亜鉛めっきの融点以上の温度
から３００℃以下まで、５０℃／秒以上の冷却速度で冷
却することを特徴とする請求項１から３の何れか１つに
記載の、溶融亜鉛めっき鋼帯の製造方法。4. The temperature of the galvanized steel strip is measured upstream of the cooling device of the steel strip pass line, and the galvanized steel strip is sprayed with a liquid mist to a temperature from the melting point of hot dip galvanizing to 300 ° C. or less, The method for producing a hot-dip galvanized steel strip according to any one of claims 1 to 3, wherein cooling is performed at a cooling rate of 50 ° C / sec or more.
粒径を１００ミクロン以下にするとともに、めっき鋼帯
幅方向の水量分布のバラツキが２０％以内となるように
液体ミストノズルを配列することを特徴とする請求項１
から４の何れか１つに記載の、溶融亜鉛めっき鋼帯の製
造方法。5. The water is used as the liquid mist, the particle size of the liquid mist is set to 100 μm or less, and the liquid mist nozzles are arranged so that the variation in the water amount distribution in the width direction of the plated steel is within 20%. Claim 1 characterized by the above.
5. The method for manufacturing a hot-dip galvanized steel strip according to any one of 1 to 4.
前記計測結果に基づいて液体ミスト量の制御を行なうこ
とを特徴とする請求項１から５の何れか１つに記載の、
溶融亜鉛めっき鋼帯の製造方法。6. The size of the generated spangle is measured,
The liquid mist amount is controlled based on the measurement result, according to any one of claims 1 to 5,
Method of manufacturing hot-dip galvanized steel strip.
れためっき鋼帯の表面に液体ミストを吹き付けて、めっ
き鋼帯の冷却を行う溶融亜鉛めっき鋼帯の製造装置にお
いて、 めっき浴上方の鋼帯パスラインの両側に冷却装置が各１
基以上配置され、前記冷却装置は、めっき鋼帯面に気体
を噴射する上下２段の気体噴射部と、前記上下２段の気
体噴射部間でめっき鋼帯面に液体ミストを噴霧する液体
ミスト噴霧部とを有することを特徴とする、溶融亜鉛め
っき鋼帯の製造装置。7. A hot-dip galvanized steel strip manufacturing apparatus for cooling a galvanized steel strip by spraying a liquid mist onto the surface of the galvanized steel strip pulled upward from the hot-dip galvanizing bath. One cooling device on each side of the pass line
The cooling device is arranged above the base, and the cooling device is a liquid mist that sprays gas onto the surface of the plated steel strip and sprays liquid mist onto the surface of the plated steel strip between the upper and lower two stages of gas spray portions. An apparatus for producing hot-dip galvanized steel strip, comprising: a spray section.
向しないようにして、鋼帯パスラインの両側に前記鋼帯
パスラインに沿って各複数基配置したことを特徴とする
請求項７記載の、溶融亜鉛めっき鋼帯の製造装置。8. A plurality of cooling devices are arranged on both sides of the steel strip pass line along the steel strip pass line such that they do not face each other with the steel strip pass line interposed therebetween. The hot-dip galvanized steel strip manufacturing apparatus described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001392054A JP3532549B2 (en) | 2001-12-25 | 2001-12-25 | Method and apparatus for producing hot-dip galvanized steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001392054A JP3532549B2 (en) | 2001-12-25 | 2001-12-25 | Method and apparatus for producing hot-dip galvanized steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003193215A true JP2003193215A (en) | 2003-07-09 |
| JP3532549B2 JP3532549B2 (en) | 2004-05-31 |
Family
ID=27599473
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001392054A Expired - Fee Related JP3532549B2 (en) | 2001-12-25 | 2001-12-25 | Method and apparatus for producing hot-dip galvanized steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3532549B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006070995A1 (en) * | 2004-12-28 | 2006-07-06 | Posco | Galvanized steel-sheet without spangle, manufacturing method thereof and device used therefor |
| JP2015004080A (en) * | 2013-06-19 | 2015-01-08 | Ｊｆｅスチール株式会社 | Vertical cooling device for steel plate, and method of manufacturing galvanized steel plate using the same |
| CN104342541A (en) * | 2014-11-24 | 2015-02-11 | 武汉钢铁(集团)公司 | Method for producing steel plate with extra deep drawing iron and zinc alloy plating layer |
| KR101778454B1 (en) * | 2016-07-15 | 2017-09-14 | 주식회사 포스코 | Forwarded cooling apparatus for coated strip and coating facility |
| CN112593176A (en) * | 2020-12-11 | 2021-04-02 | 东北大学 | Fog control equipment for hot-dip galvanized strip steel small spangle production and control system thereof |
-
2001
- 2001-12-25 JP JP2001392054A patent/JP3532549B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006070995A1 (en) * | 2004-12-28 | 2006-07-06 | Posco | Galvanized steel-sheet without spangle, manufacturing method thereof and device used therefor |
| US7914851B2 (en) | 2004-12-28 | 2011-03-29 | Posco | Method of manufacturing hot-dipped galvanized steel sheet |
| JP2015004080A (en) * | 2013-06-19 | 2015-01-08 | Ｊｆｅスチール株式会社 | Vertical cooling device for steel plate, and method of manufacturing galvanized steel plate using the same |
| CN104342541A (en) * | 2014-11-24 | 2015-02-11 | 武汉钢铁(集团)公司 | Method for producing steel plate with extra deep drawing iron and zinc alloy plating layer |
| KR101778454B1 (en) * | 2016-07-15 | 2017-09-14 | 주식회사 포스코 | Forwarded cooling apparatus for coated strip and coating facility |
| WO2018012950A1 (en) * | 2016-07-15 | 2018-01-18 | 주식회사 포스코 | Plated steel sheet-precooling device and plating equipment including same |
| CN109642302A (en) * | 2016-07-15 | 2019-04-16 | Posco公司 | Coated steel sheet precools device and the plating equipment including the device |
| CN112593176A (en) * | 2020-12-11 | 2021-04-02 | 东北大学 | Fog control equipment for hot-dip galvanized strip steel small spangle production and control system thereof |
| CN112593176B (en) * | 2020-12-11 | 2021-09-24 | 东北大学 | Fog control equipment for hot-dip galvanized strip steel small spangle production and control system thereof |
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| Publication number | Publication date |
|---|---|
| JP3532549B2 (en) | 2004-05-31 |
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