JPH10204599A - Method for controlling hot-dip coating amount and gas wiping nozzle - Google Patents
Method for controlling hot-dip coating amount and gas wiping nozzleInfo
- Publication number
- JPH10204599A JPH10204599A JP948697A JP948697A JPH10204599A JP H10204599 A JPH10204599 A JP H10204599A JP 948697 A JP948697 A JP 948697A JP 948697 A JP948697 A JP 948697A JP H10204599 A JPH10204599 A JP H10204599A
- Authority
- JP
- Japan
- Prior art keywords
- jet
- nozzle
- main
- hot
- sub
- 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.)
- Withdrawn
Links
- 238000003618 dip coating Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 42
- 239000010959 steel Substances 0.000 claims abstract description 42
- 239000002184 metal Substances 0.000 claims abstract description 20
- 238000005192 partition Methods 0.000 claims abstract description 17
- 238000007747 plating Methods 0.000 claims description 19
- 238000005507 spraying Methods 0.000 claims description 2
- 239000012943 hotmelt Substances 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract 2
- 238000000576 coating method Methods 0.000 abstract 2
- 238000007598 dipping method Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 210000004894 snout Anatomy 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼帯に噴流を吹き付け
過剰な溶融めっき金属を搾り取る際、騒音やスプラッシ
ュ発生を抑え、溶融めっき付着量を効率よく制御する方
法及びガスワイピングノズルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a gas wiping nozzle for suppressing the generation of noise and splash and efficiently controlling the amount of hot-dip coating when a jet is blown onto a steel strip to squeeze out excess hot-dip metal.
【０００２】[0002]
【従来の技術】溶融めっきラインでは、図１に示すよう
に、めっき原板である鋼帯１を還元性雰囲気に維持され
た還元焼鈍炉２に搬送し、鋼帯１の表面を活性化した
後、還元焼鈍炉２からスナウト３を経て溶融めっき浴４
に送り込んでいる。鋼帯１は、溶融めっき浴４に浸漬さ
れているシンクロール５を周回し、進行方向を上向きに
変更される。次いで、鋼帯１は、サポートロール６を経
由して溶融めっき浴４から送り出され、ガスワイピング
装置７で付着量が調整される。溶融めっきされた鋼帯１
は、必要に応じて合金化熱処理され、次工程に搬送され
る。ガスワイピング装置７では、図２に示すように鋼帯
１の表面側及び裏面側に配置したガスワイピング装置７
のガスワイピングノズル８から噴射された噴流９を鋼帯
１に吹き付けることにより、鋼帯１に付着している過剰
な溶融めっき金属を搾り取り、めっき付着量を調整して
いる。このとき、鋼帯１への噴流９の衝突，鋼帯１の板
幅方向端部における噴流９相互の衝突によって騒音が発
生し、作業環境が悪化する。2. Description of the Related Art In a hot-dip galvanizing line, as shown in FIG. 1, a steel strip 1, which is a raw plate for plating, is conveyed to a reduction annealing furnace 2 maintained in a reducing atmosphere to activate the surface of the steel strip 1. Hot-dip plating bath 4 from reduction annealing furnace 2 through snout 3
Has been sent to. The steel strip 1 goes around the sink roll 5 immersed in the hot-dip plating bath 4, and its traveling direction is changed upward. Next, the steel strip 1 is sent out from the hot-dip plating bath 4 via the support roll 6, and the amount of adhesion is adjusted by the gas wiping device 7. Hot-dip coated steel strip 1
Is subjected to an alloying heat treatment as required and transported to the next step. In the gas wiping device 7, as shown in FIG. 2, the gas wiping device 7 is disposed on the front side and the back side of the steel strip 1.
By spraying the jet 9 sprayed from the gas wiping nozzle 8 on the steel strip 1, excess hot-dip coated metal adhering to the steel strip 1 is squeezed out, and the amount of plating applied is adjusted. At this time, noise occurs due to the collision of the jet 9 with the steel strip 1 and the collision of the jets 9 with each other at the end of the steel strip 1 in the plate width direction, thereby deteriorating the working environment.
【０００３】ところで、ライン速度を高速化させ溶融め
っきの生産性を向上させる要求が近年高まってきてい
る。ライン速度を高速化すると、鋼帯１が溶融めっき浴
４から引き上げられた際、溶融めっき浴４から持ち上げ
られる溶融めっき金属の量が増加する。過剰な溶融めっ
き金属を搾り取るためには、ガスワイピングノズル８か
ら噴射される噴流９を増加させ、或いは鋼帯１にガスワ
イピングノズル８を接近させる必要がある。しかし、何
れの手段でも、噴流９の衝突に起因する騒音が更に高ま
り、作業環境が一層悪化する。また、鋼帯１に衝突した
後で鋼帯面に沿って下向きに流れる気体が不安定化し、
溶融めっき浴１の表面上で多量のスプラッシュが発生し
易くなる。In recent years, there has been a growing demand for increasing the line speed and improving the productivity of hot-dip plating. When the line speed is increased, when the steel strip 1 is pulled up from the hot-dip plating bath 4, the amount of hot-dip coated metal lifted from the hot-dip plating bath 4 increases. In order to squeeze out excess hot-dip plated metal, it is necessary to increase the jet 9 jetted from the gas wiping nozzle 8 or to bring the gas wiping nozzle 8 closer to the steel strip 1. However, in any case, noise caused by the collision of the jet 9 is further increased, and the working environment is further deteriorated. Further, the gas flowing downward along the steel strip surface after colliding with the steel strip 1 becomes unstable,
A large amount of splash easily occurs on the surface of the hot-dip plating bath 1.
【０００４】そこで、溶融めっき金属を搾り取る主ノズ
ル及び主ノズルの上下面に配置した副ノズルをもつガス
ワイピングノズルを使用し、各ノズルから噴流を噴射さ
せる方法が特開平１−２３０７５８号公報，特開平４−
７４８５８号公報等で紹介されている。この方法による
とき、主ノズルからの噴流は、副ノズルからの噴流によ
って広がり角が大きくなることが抑えられ、ポテンシャ
ルコア領域が長くなり、結果として噴流の流量を増加さ
せたり、鋼帯からガスワイピングノズルまでの距離を小
さくすることなく、めっき付着量が制御できるとされて
いる。また、主ノズルからの噴流は、広がり角の拡大が
抑制されているので、鋼帯に衝突した後で鋼帯面に沿っ
て下向きに流れる気体が安定化するとされている。Japanese Patent Laid-Open Publication No. 1-230758 discloses a method in which a gas wiping nozzle having a main nozzle for squeezing hot-dip metal and sub-nozzles arranged on the upper and lower surfaces of the main nozzle is used to jet a jet from each nozzle. Kaihei 4-
No. 74858, and the like. According to this method, the jet from the main nozzle is prevented from increasing in divergence angle due to the jet from the sub-nozzle, and the potential core region is lengthened, resulting in an increase in the flow rate of the jet or gas wiping from the steel strip. It is said that the amount of plating can be controlled without reducing the distance to the nozzle. Further, since the expansion of the divergence angle of the jet from the main nozzle is suppressed, the gas flowing downward along the steel strip surface after colliding with the steel strip is said to be stabilized.
【０００５】[0005]
【発明が解決しようとする課題】しかし、主ノズル及び
副ノズルを備えたガスワイピングノズルから噴流を噴射
させると、図３に示すように主ノズル１０と副ノズル１
１との境界に位置する仕切り板１２の後方に滞留域１３
が発生し、噴射された噴流９との間に剪断層１４が形成
される。噴流９が高レイノルズ数の乱流に近付くと、大
きな乱流の渦１５が剪断層１４に発生し、剪断層１４及
び滞留域１３の流体と混合するようになる。その結果、
滞留域１３の流体は、混合作用によって噴流９の噴射方
向に誘引され、ポテンシャルコア領域１６の成長が阻害
される。However, when a jet stream is jetted from a gas wiping nozzle having a main nozzle and a sub-nozzle, as shown in FIG.
Behind the partition plate 12 located at the boundary with
Is generated, and a shear layer 14 is formed between the jet stream 9 and the jet stream 9. When the jet 9 approaches a turbulent flow having a high Reynolds number, a large turbulent vortex 15 is generated in the shear layer 14 and mixes with the fluid in the shear layer 14 and the stagnation zone 13. as a result,
The fluid in the stagnation region 13 is attracted in the jet direction of the jet 9 by the mixing action, and the growth of the potential core region 16 is inhibited.
【０００６】噴流９が乱流に遷移するレイノルズ数は約
３０と低いため、ガスワイピングのような高速で噴射さ
れた噴流９は乱流状態になっている。ポテンシャルコア
領域１６は、ガスワイピングノズル８の噴射口での噴流
９の流速と同一な値が保たれる領域である。この領域１
６が長いと、高ライン速度の溶融めっきにみられるよう
に溶融めっき浴４から多量の溶融めっき金属が持ち上げ
られる場合でも、噴流９を流量増加させたりガスワイピ
ングノズル８と鋼帯１間の距離を短くすることなく、効
率よく溶融めっき付着量を制御できる。Since the Reynolds number at which the jet 9 transitions to a turbulent flow is as low as about 30, the jet 9 injected at a high speed such as gas wiping is in a turbulent state. The potential core region 16 is a region where the same value as the flow velocity of the jet 9 at the injection port of the gas wiping nozzle 8 is maintained. This area 1
If the length 6 is long, even when a large amount of hot-dip metal is lifted from the hot-dip bath 4 as seen in hot-dip hot-dip coating, the flow rate of the jet 9 can be increased or the distance between the gas wiping nozzle 8 and the steel strip 1 can be increased. , And the amount of hot-dip coating can be efficiently controlled without shortening the length.
【０００７】しかし、従来のガスワイピングノズルで発
生したポテンシャルコア領域１６は、乱流の渦１５によ
って成長が妨げられ、十分な長さにならない。そのた
め、噴流９の流量増加や鋼帯１からガスワイピングノズ
ル８までの距離の縮小等の処置が必要とされ、結果とし
て騒音が大音量化し、また溶融めっき浴４の表面でスプ
ラッシュが発生し易くなる。本発明は、このような問題
を解消すべく案出されたものであり、副ノズルからの副
噴流で主ノズルからの主噴流を絞るように鋼帯の表裏面
に吹き付けることにより、噴流の流量を増加させる必要
なく溶融めっき金属の付着量を広範囲で調整することを
目的とする。However, the growth of the potential core region 16 generated by the conventional gas wiping nozzle is hindered by the turbulent vortex 15, and the potential core region 16 does not have a sufficient length. Therefore, measures such as an increase in the flow rate of the jet 9 and a reduction in the distance from the steel strip 1 to the gas wiping nozzle 8 are required. As a result, the volume of the noise is increased, and splash is easily generated on the surface of the hot-dip plating bath 4. Become. The present invention has been devised to solve such a problem, and the sub-jet from the sub-nozzle sprays the main jet from the main nozzle on the front and back surfaces of the steel strip so as to throttle the main jet. It is an object of the present invention to adjust the amount of the hot-dip coated metal in a wide range without increasing the amount of hot-dip metal.
【０００８】[0008]
【課題を解決するための手段】本発明の溶融めっき付着
量制御方法は、その目的を達成するため、鋼帯幅方向に
長い噴出口が設けられた主ノズルから主として溶融めっ
き金属の付着量を調節する主噴流を噴射し、噴出口側の
先端面が尖ったテーパ部を付けた仕切り板で主ノズルか
ら仕切られ、鋼帯幅方向に長い噴出口が設けられた副ノ
ズルから、主噴流に対して僅かに傾斜した副噴流を噴射
し、溶融めっき浴から引き上げられている鋼帯の表裏両
面に主噴流及び副噴流を吹き付けることを特徴とする。
この方法で使用するガスワイピングノズルは、主として
溶融めっき金属の付着量を調節する主噴流を噴射する鋼
帯幅方向に長い噴出口をもつ主ノズルと、主ノズルの外
側上下面に設けられ鋼帯幅方向に長い噴出口をもつ副ノ
ズルと、主ノズル及び副ノズルとの間を仕切り、噴出口
側の先端面が尖ったテーパ部を付けた仕切り板とを備え
ている。副ノズルは、主ノズルに対して僅かに，具体的
には５〜２０度の傾斜角度で傾斜させていることが好ま
しい。In order to achieve the object, a method for controlling the amount of hot-dip coating in accordance with the present invention is to measure the amount of hot-dip coating metal mainly from a main nozzle provided with a long ejection port in the steel strip width direction. The main jet to be adjusted is jetted, and the tip end surface on the jet outlet side is separated from the main nozzle by a partition plate with a sharp taper, and from the sub-nozzle with a long jet in the steel strip width direction, the main jet is On the other hand, a sub-jet which is slightly inclined is jetted, and the main jet and the sub-jet are sprayed on both the front and back surfaces of the steel strip pulled up from the hot-dip plating bath.
The gas wiping nozzle used in this method includes a main nozzle having a long ejection port in a width direction of a steel strip for injecting a main jet for mainly adjusting the amount of hot-dip coated metal, and a steel strip provided on upper and lower outer surfaces of the main nozzle. It has a sub-nozzle having an ejection port that is long in the width direction, and a partition plate that partitions between the main nozzle and the sub-nozzle and has a tapered portion with a sharp tip surface on the ejection port side. It is preferable that the sub nozzle is slightly inclined with respect to the main nozzle, specifically, at an inclination angle of 5 to 20 degrees.
【０００９】[0009]
【作用】本発明者等は、水モデルを使用した実験により
ポテンシャルコア領域及び乱流の発生状況を調査した。
水モデル実験では、図４に示すように、ガスワイピング
ノズルを模擬したノズルモデル１７を水槽１８に配置
し、水１９を水槽１８に入れた。一定量のアルミナ懸濁
液２０をノズルモデル１７から水中に吹き込み、噴流２
１の状態を観察した。この水モデル実験の結果、ポテン
シャルコア領域を長くするためには噴流２１の広がり角
を抑えることが必要であり、噴流２１とほぼ平行な流れ
を噴流２１の上下位置に形成するとき噴流２１の広がり
角が抑えられることを見い出した。具体的には、図５に
示すように主ノズル１０の上面及び下面に副ノズル１１
を設けたノズルモデル１７を用い、各ノズル１０，１１
から主噴流２３及び副噴流２４を噴射させた。主ノズル
１０に対して副ノズル１１の指向方向を僅かに傾斜さ
せ、副噴流で主噴流２３を絞り込むように噴射させたと
ころ、主噴流２３のポテンシャルコア領域１６は、副噴
流２４がない場合と比較して約３０％長くなることが判
った。しかし、仕切り板１２の端面が直角になっている
と、図３で説明したように乱流渦１５の発生があるた
め、ポテンシャルコア領域１６の長さ増加に限度があ
る。The present inventors have investigated the potential core region and the occurrence of turbulence by experiments using a water model.
In the water model experiment, as shown in FIG. 4, a nozzle model 17 simulating a gas wiping nozzle was arranged in a water tank 18, and water 19 was put in the water tank 18. A certain amount of the alumina suspension 20 is blown into water from the nozzle model 17, and the jet 2
The state of No. 1 was observed. As a result of this water model experiment, it is necessary to suppress the divergence angle of the jet 21 in order to lengthen the potential core region, and when a flow almost parallel to the jet 21 is formed above and below the jet 21, the spread of the jet 21 I found that the corner could be suppressed. More specifically, as shown in FIG.
The nozzle model 17 provided with
, A main jet 23 and a sub jet 24 were jetted. When the directional direction of the sub-nozzle 11 is slightly inclined with respect to the main nozzle 10 and the main jet 23 is jetted so as to be narrowed by the sub-jet, the potential core region 16 of the main jet 23 has a case where there is no sub-jet 24. It was found to be about 30% longer than in comparison. However, when the end face of the partition plate 12 is at a right angle, the turbulent vortex 15 is generated as described with reference to FIG.
【００１０】そこで、主ノズル１０と副ノズル１１との
間に位置する仕切り板１２の先端に、図６に示すように
先端が尖ったテーパ部２２を付けることに思い至った。
先端の尖ったテーパ部２２は、噴出口近傍の仕切り板１
２を両面から凹状に加工することにより形成される。テ
ーパ部２２の先端では、主噴流２３に副噴流２４が急角
度で衝突して主噴流２３のエネルギーを低下させないよ
うに、５度以下の角度にすることが好ましい。また、主
噴流２３の広がりを副噴流２４で抑えるためには、主ノ
ズル１０に対して副ノズル１１の指向方向を５度以上の
傾斜角度で傾斜させることが好ましい。しかし、２０度
を超える傾斜角度では、主噴流２３に対する副噴流２４
の衝突によるエネルギー損失が大きくなる。このワイピ
ングノズルでは、先端が尖ったテーパ部２２のため主噴
流２３と副噴流２４との間に滞留域１３を生じることな
く、副噴流２４で主噴流２３が絞り込まれるように噴出
される。そのため、乱流渦１５の発生がなく、主ノズル
１０単独の噴流で生じるポテンシャルコア領域１６に比
較して約５０％長くなることが判った。Therefore, the present inventors came to think that a tapered portion 22 having a sharp tip was provided at the tip of the partition plate 12 located between the main nozzle 10 and the sub-nozzle 11, as shown in FIG.
The tapered portion 22 having a sharp tip is used for the partition plate 1 near the ejection port.
2 is formed by processing a concave shape from both sides. At the tip of the tapered portion 22, the angle is preferably set to 5 degrees or less so that the sub jet 24 does not collide with the main jet 23 at a steep angle to lower the energy of the main jet 23. In order to suppress the spread of the main jet 23 by the sub jet 24, it is preferable to incline the directing direction of the sub nozzle 11 with respect to the main nozzle 10 at an inclination angle of 5 degrees or more. However, at an inclination angle exceeding 20 degrees, the sub jets 24
The energy loss due to collisions is large. In the wiping nozzle, the main jet 23 is jetted so as to be narrowed by the sub jet 24 without generating a stagnation area 13 between the main jet 23 and the sub jet 24 due to the tapered portion 22 having a sharp tip. Therefore, it was found that the turbulent vortex 15 was not generated, and the length was about 50% longer than the potential core region 16 generated by the jet of the main nozzle 10 alone.
【００１１】[0011]
【実施の形態】本発明に従った溶融めっき付着量制御で
は、図７に示すように溶融めっき浴４から送り出される
鋼帯１の表面側及び裏面側にガスワイピング装置７を配
置し、ガスワイピングノズル８から噴流を噴射させて鋼
帯１に吹き付ける。ガスワイピングノズル８は、主とし
て溶融めっき金属を搾り取る主噴流２３を噴射する主ノ
ズル１０を中心として、主ノズル１０の上下面に副ノズ
ル１１，１１を配置した構造を持っている。副ノズル１
１，１１からは、主ノズル１０からの噴流２３に向かっ
て僅かな傾斜角度で副噴流２４が噴射される。主ノズル
１０と副ノズル１１，１１とを仕切る仕切り板１２の端
面は、先端が尖ったテーパ部２２に成形されている。テ
ーパ部２２の先端角度は、主噴流２３と副噴流２４との
間に滞留域が生じないように５度以下にすることが好ま
しい。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the control of the amount of hot-dip coating according to the present invention, as shown in FIG. 7, gas wiping devices 7 are arranged on the front side and the back side of a steel strip 1 sent out from a hot-dip plating bath 4 to perform gas wiping. A jet stream is jetted from the nozzle 8 and sprayed on the steel strip 1. The gas wiping nozzle 8 has a structure in which sub nozzles 11, 11 are arranged on the upper and lower surfaces of the main nozzle 10, centering on the main nozzle 10 that mainly jets a main jet 23 that squeezes the hot-dip metal. Sub nozzle 1
Sub jets 24 are jetted from 1 and 11 toward jets 23 from main nozzle 10 at a slight inclination angle. The end surface of the partition plate 12 that partitions the main nozzle 10 and the sub nozzles 11 and 11 is formed into a tapered portion 22 having a sharp tip. The tip angle of the tapered portion 22 is preferably set to 5 degrees or less so that a stagnant area does not occur between the main jet 23 and the sub jet 24.
【００１２】主噴流２３及び副噴流２４は、先端が尖っ
たテーパ部２２のため噴射直後から互いに接触した状態
で噴出される。そのため、図３で説明した滞留域１３や
乱流渦１５の発生がない。また、主ノズル１０に対して
副ノズル１１が僅かに傾斜しているので、主噴流２３
は、副噴流２４で絞り込まれるように噴射される。その
結果、主ノズル１０から噴射された主噴流２３のポテン
シャルコア領域１６は非常に長くなる。したがって、主
噴流２３の流量増加，鋼帯１に対するワイピングノズル
８の近接配置等に起因した騒音の増大や溶融めっき浴４
の浴面上でのスプラッシュ発生が防止され、効率よく溶
融めっき付着量を制御することが可能となる。The main jet 23 and the sub jet 24 are jetted out of contact with each other immediately after jetting because of the tapered portion 22 having a sharp tip. Therefore, there is no generation of the stagnation area 13 and the turbulent vortex 15 described with reference to FIG. Further, since the sub-nozzle 11 is slightly inclined with respect to the main nozzle 10, the main jet 23
Is jetted so as to be narrowed down by the sub jet 24. As a result, the potential core region 16 of the main jet 23 jetted from the main nozzle 10 becomes very long. Accordingly, an increase in the flow rate of the main jet 23, an increase in noise due to the close arrangement of the wiping nozzle 8 with respect to the steel strip 1, and the like, and an increase in the hot-dip plating bath 4
Splash on the bath surface is prevented, and the amount of hot-dip coating can be controlled efficiently.
【００１３】[0013]
【実施例】ガスワイピング装置７に、高さ１ｍｍ，幅２
０００ｍｍの噴射口をもつ主ノズル１０の外側上下面に
主ノズルと同寸法の噴射口をもつ副ノズル１１，１１を
配置したガスワイピングノズル８を使用した。なお、主
ノズル１０と副ノズル１１，１１との間には、噴射口側
に先端角度５度のテーパ部２２を付けた仕切り板１２を
設けた。ガスワイピング装置７を溶融めっき浴４から引
き上げられる鋼帯１の表面側及び裏面側に対向させ、溶
融めっき浴４の湯面から高さ２００ｍｍ，鋼帯１までの
距離２０ｍｍの位置に配置した。DESCRIPTION OF THE PREFERRED EMBODIMENTS A gas wiping device 7 has a height of 1 mm and a width of 2 mm.
A gas wiping nozzle 8 was used in which sub-nozzles 11 and 11 having injection ports of the same size as the main nozzle were arranged on the upper and lower outer surfaces of a main nozzle 10 having an injection port of 000 mm. A partition plate 12 having a tapered portion 22 having a tip angle of 5 degrees was provided between the main nozzle 10 and the sub-nozzles 11 and 11 on the side of the injection port. The gas wiping device 7 was opposed to the front side and the back side of the steel strip 1 pulled up from the hot-dip plating bath 4, and was disposed at a position of 200 mm in height from the surface of the hot-dip bath 4 and a distance of 20 mm from the hot-dip bath 4 to the steel strip 1.
【００１４】板厚０．８ｍｍ，板幅１２００ｍｍの鋼帯
１をライン速度１６０ｍ／分で溶融めっき浴４に導入
し、シンクロール５を経て垂直上方に引き上げ、ガスワ
イピング装置７で溶融めっき付着量を調整した。主ノズ
ル１０及び副ノズル１１，１１から噴射される噴流２
３，２４の圧力を、共に０．２５ｋｇｆ／ｃｍ2 に設定
した。このガスワイピングにより、溶融めっき金属の付
着量を６０ｇ／ｍ2 まで絞ることができた。このときの
騒音は、約１２０ｄＢであった。比較のため、副ノズル
１１，１１からの副噴流２４をなくし、主ノズル１０の
みから圧力０．２５ｋｇｆ／ｃｍ2 で主噴流２４を噴射
させた。この場合、騒音は約１２０ｄＢと同様であった
が、溶融めっき金属の付着量を９０ｇ／ｍ2 まで絞るこ
とが限界であった。A steel strip 1 having a thickness of 0.8 mm and a width of 1200 mm is introduced into a hot-dip plating bath 4 at a line speed of 160 m / min, pulled vertically upward through a sink roll 5, and coated with a gas wiping device 7. Was adjusted. Jet stream 2 jetted from main nozzle 10 and sub-nozzles 11, 11
The pressures of 3, 24 were both set to 0.25 kgf / cm 2 . By this gas wiping, the amount of the hot-dip coated metal could be reduced to 60 g / m 2 . The noise at this time was about 120 dB. For comparison, the sub jets 24 from the sub nozzles 11 and 11 were eliminated, and the main jets 24 were jetted from only the main nozzle 10 at a pressure of 0.25 kgf / cm 2 . In this case, the noise was similar to about 120 dB, but the limit was to reduce the amount of the hot-dip coated metal to 90 g / m 2 .
【００１５】この対比から明らかなように、本発明によ
るとき、作業環境を悪化させることなく溶融めっき金属
の付着量制御を広範囲で行うことが可能となった。これ
は、先端が尖ったテーパ部２２で主ノズル１０と副ノズ
ル１１，１１との間を仕切り、滞留域１３や乱流渦１５
の発生を抑え、主噴流２３のポテンシャルコア領域１６
を長くした結果である。換言すれば、ポテンシャルコア
領域１６を長くした噴流２３でワイピングするため、噴
流２３の流量増加やガスワイピングノズル８の近接配置
が必要なく、鋼帯１に付着する溶融めっき金属を多量に
搾り取ることが可能となった。As is clear from this comparison, according to the present invention, it is possible to control the amount of hot-dip coated metal in a wide range without deteriorating the working environment. This is because the main nozzle 10 and the sub-nozzles 11 and 11 are partitioned by the tapered portion 22 having a sharp tip, and the stagnant region 13 and the turbulent vortex 15 are separated.
Of the potential core region 16 of the main jet 23
This is the result of lengthening. In other words, since the potential core region 16 is wiped with the jet 23 having a longer length, it is not necessary to increase the flow rate of the jet 23 or dispose the gas wiping nozzle 8 in the vicinity, and it is possible to squeeze a large amount of the hot-dip metal deposited on the steel strip 1. It has become possible.
【００１６】[0016]
【発明の効果】以上に説明したように、本発明において
は、先端が尖った仕切り板で主ノズルと副ノズルとの間
を仕切り、溶融めっき金属の付着量を調節する主噴流を
噴射直後から副噴流で絞り込むように噴射させている。
そのため、滞留域や乱流渦による影響がなく、噴流のポ
テンシャルコア領域が長くなる。したがって、騒音の増
大をもたらす噴流圧力の上昇や、スプラッシュ多発の原
因となるワイピングノズルの鋼帯に対する近接配置の必
要なく、良好な付着量制御が可能となる。As described above, in the present invention, the main nozzle and the sub-nozzle are partitioned by the partition plate having a sharp tip, and the main jet for adjusting the amount of hot-dip coated metal is formed immediately after the injection. Injection is performed so that it is narrowed by the sub jet.
Therefore, there is no influence of the stagnation area or the turbulent vortex, and the potential core region of the jet becomes longer. Therefore, good control of the amount of adhesion can be achieved without the need to increase the jet pressure, which causes an increase in noise, or to dispose the wiping nozzle close to the steel strip, which causes frequent splashes.
【図１】 ガスワイピング装置を組み込んだ溶融めっき
装置[Fig. 1] Hot-dip galvanizing system incorporating gas wiping system
【図２】 鋼帯に対向配置したガスワイピング装置Fig. 2 Gas wiping device arranged opposite to steel strip
【図３】 主ノズル及び副ノズルからの噴流の流動状態FIG. 3 Flow states of jets from a main nozzle and a sub-nozzle
【図４】 噴流の流動状態を調査した水モデル実験装置Fig. 4 Water model experimental device for investigating the flow state of a jet
【図５】 水モデル実験に使用したノズルモデルFig. 5 Nozzle model used for water model experiment
【図６】 先端が尖ったテーパ部をもつ仕切り板を備え
たノズルモデルFIG. 6 is a nozzle model provided with a partition plate having a tapered portion with a sharp tip.
【図７】 実施例で使用したガスワイピング装置FIG. 7 is a gas wiping device used in the embodiment.
１：鋼帯 ２：還元焼鈍炉 ３：スナウト ４：
溶融めっき浴 ５：シンクロール ６：サポートロール ７：ガス
ワイピング装置 ８：ガスワイピングノズル ９：噴流 １０：主ノ
ズル １１：副ノズル １２：仕切り板 １３：滞留域 １４：剪断層
１５：乱流の渦 １６：ポテンシャルコア領域 １７：ノズルモデル
１８：水槽 １９：水 ２０：アルミナ懸濁流 ２１：噴流
２２：テーパ部 ２３：主噴流 ２４：副噴流1: Steel strip 2: Reduction annealing furnace 3: Snout 4:
Hot-dip plating bath 5: Sink roll 6: Support roll 7: Gas wiping device 8: Gas wiping nozzle 9: Jet 10: Main nozzle 11: Sub nozzle 12: Partition plate 13: Retention area 14: Shear layer
15: Turbulent vortex 16: Potential core region 17: Nozzle model
18: Water tank 19: Water 20: Alumina suspension flow 21: Jet flow
22: tapered portion 23: main jet 24: sub jet
Claims (3)
ノズルから主として溶融めっき金属の付着量を調節する
主噴流を噴射し、噴出口側の先端面が尖ったテーパ部を
付けた仕切り板で主ノズルから仕切られ、鋼帯幅方向に
長い噴出口が設けられた副ノズルから、主噴流に対して
僅かに傾斜した副噴流を噴射し、溶融めっき浴から引き
上げられている鋼帯の表裏両面に主噴流及び副噴流を吹
き付けることを特徴とする溶融めっき付着量の制御方
法。1. A main jet, which mainly adjusts the amount of hot-dip coated metal, is jetted from a main nozzle provided with a long jet outlet in the steel strip width direction, and a tapered portion with a sharp tip end surface on the jet outlet side is provided. The sub-nozzle, which is separated from the main nozzle by a partition plate and has a long jet in the width direction of the steel strip, jets a sub-jet that is slightly inclined with respect to the main jet, and is pulled up from the hot-dip plating bath. A method for controlling the amount of hot-dip coating, characterized by spraying a main jet and a sub jet onto both front and back surfaces of the hot melt plating.
する主噴流を噴射する鋼帯幅方向に長い噴出口をもつ主
ノズルと、主ノズルの外側上下面に設けられ鋼帯幅方向
に長い噴出口をもつ副ノズルと、主ノズル及び副ノズル
との間を仕切り、噴出口側の先端面が尖ったテーパ部を
付けた仕切り板とを備えているガスワイピングノズル。2. A main nozzle having a long jet outlet in the width direction of a steel strip for jetting a main jet mainly for adjusting the adhesion amount of hot-dip metal, and a long jet provided in upper and lower outer surfaces of the main nozzle in the width direction of the steel strip. A gas wiping nozzle comprising: a sub-nozzle having an outlet; and a partition plate that partitions between the main nozzle and the sub-nozzle and has a tapered portion with a sharp tip surface on the side of the jet port.
させている請求項２記載のガスワイピングノズル。3. The gas wiping nozzle according to claim 2, wherein the sub nozzle is slightly inclined with respect to the main nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP948697A JPH10204599A (en) | 1997-01-22 | 1997-01-22 | Method for controlling hot-dip coating amount and gas wiping nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP948697A JPH10204599A (en) | 1997-01-22 | 1997-01-22 | Method for controlling hot-dip coating amount and gas wiping nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10204599A true JPH10204599A (en) | 1998-08-04 |
Family
ID=11721569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP948697A Withdrawn JPH10204599A (en) | 1997-01-22 | 1997-01-22 | Method for controlling hot-dip coating amount and gas wiping nozzle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10204599A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007031805A (en) * | 2005-07-29 | 2007-02-08 | Jfe Steel Kk | Manufacturing method of molten metal plated steel strip |
| WO2007132701A1 (en) | 2006-05-12 | 2007-11-22 | Jfe Steel Corporation | Method for manufacturing molten-metal plated steel band |
| US8113139B2 (en) * | 2006-12-08 | 2012-02-14 | Posco | Gas wiping apparatus having adjustable gas guide |
| CN110088348A (en) * | 2016-12-22 | 2019-08-02 | 塔塔钢铁艾默伊登有限责任公司 | Air wipe device and nozzle for air wipe device |
| WO2022135828A1 (en) * | 2020-12-22 | 2022-06-30 | Tata Steel Nederland Technology B.V. | Multi-jet air knife |
-
1997
- 1997-01-22 JP JP948697A patent/JPH10204599A/en not_active Withdrawn
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007031805A (en) * | 2005-07-29 | 2007-02-08 | Jfe Steel Kk | Manufacturing method of molten metal plated steel strip |
| US8529998B2 (en) | 2006-05-12 | 2013-09-10 | Jfe Steel Corporation | Method for manufacturing molten metal plated steel strip |
| US20090159233A1 (en) * | 2006-05-12 | 2009-06-25 | Takeda Gentaro | Method for Manufacturing Molten Metal Plated Steel Strip |
| EP2017365A4 (en) * | 2006-05-12 | 2009-09-16 | Jfe Steel Corp | METHOD FOR THE PRODUCTION OF MELT-LIQUID METAL COATED STEEL STRIP |
| EP2474640A1 (en) | 2006-05-12 | 2012-07-11 | JFE Steel Corporation | Method for manufacturing molten metal plated steel strip |
| WO2007132701A1 (en) | 2006-05-12 | 2007-11-22 | Jfe Steel Corporation | Method for manufacturing molten-metal plated steel band |
| EP2474640B1 (en) | 2006-05-12 | 2017-02-08 | JFE Steel Corporation | Method for manufacturing molten metal plated steel strip |
| EP3190204A2 (en) | 2006-05-12 | 2017-07-12 | JFE Steel Corporation | Method for manufacturing molten metal plated steel strip |
| EP3190204A3 (en) * | 2006-05-12 | 2017-09-20 | JFE Steel Corporation | Method for manufacturing molten metal plated steel strip |
| EP3656887A1 (en) | 2006-05-12 | 2020-05-27 | JFE Steel Corporation | Method for manufacturing molten metal plated steel strip |
| US8113139B2 (en) * | 2006-12-08 | 2012-02-14 | Posco | Gas wiping apparatus having adjustable gas guide |
| CN110088348A (en) * | 2016-12-22 | 2019-08-02 | 塔塔钢铁艾默伊登有限责任公司 | Air wipe device and nozzle for air wipe device |
| WO2022135828A1 (en) * | 2020-12-22 | 2022-06-30 | Tata Steel Nederland Technology B.V. | Multi-jet air knife |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20040406 |