JPH07268588A - How to control the amount of plated metal - Google Patents
How to control the amount of plated metalInfo
- Publication number
- JPH07268588A JPH07268588A JP6232094A JP6232094A JPH07268588A JP H07268588 A JPH07268588 A JP H07268588A JP 6232094 A JP6232094 A JP 6232094A JP 6232094 A JP6232094 A JP 6232094A JP H07268588 A JPH07268588 A JP H07268588A
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- Prior art keywords
- plated
- distance
- steel plate
- nozzle
- amount
- Prior art date
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Abstract
(57)【要約】
【構成】 気体噴射法によるめっき金属付着量の制御方
法であって、被めっき鋼板の両面側に対向配置された一
対のワイピングノズルの上部に距離計を複数台設置し、
該複数の距離計の測定値に基づいて、被めっき鋼板とワ
イピングノズル間の距離を推定することにより、被めっ
き鋼板の反りに由来する被めっき鋼板とワイピングノズ
ル間の距離の測定誤差を排除する。
【効果】 めっき金属付着量の制御精度を向上するとと
もに、ノズルと被めっき鋼板との接触の危険性を排除し
て、鋼板の品質欠陥やノズル損傷事故等の削減を図りつ
つ、かつ薄目付化操業を実現することが可能となる。
(57) [Summary] [Structure] A method of controlling the amount of plating metal deposition by a gas injection method, in which a plurality of rangefinders are installed above a pair of wiping nozzles that are arranged facing each other on both sides of a steel plate to be plated,
Estimating the distance between the steel plate to be plated and the wiping nozzle based on the measured values of the plurality of distance meters eliminates the measurement error of the distance between the steel plate to be plated and the wiping nozzle, which is caused by the warp of the steel plate to be plated. . [Effect] While improving the control accuracy of the amount of plated metal, eliminating the risk of contact between the nozzle and the steel plate to be plated, while reducing the quality defects of the steel plate and the accident of nozzle damage, etc. The operation can be realized.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、溶融金属めっきライン
におけるめっき金属付着量の制御方法、特に気体噴射法
によるめっき金属付着量の制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the amount of plated metal deposited in a molten metal plating line, and more particularly to a method for controlling the amount of deposited metal deposited by a gas injection method.
【０００２】[0002]
【従来の技術】従来、気体噴射法による溶融金属めっき
ラインにおけるめっき金属付着量（めっき厚み）の制御
方法では、ワイピングノズル（以下ノズルと略称す
る。）からのガス圧力（以下ガス圧と略称する。）と、
被めっき鋼板とノズル間の距離（以下ノズル間距離と略
称する。）を主な操作量として制御している。2. Description of the Related Art Conventionally, in a method of controlling the amount of deposited metal (plating thickness) in a molten metal plating line by a gas injection method, a gas pressure from a wiping nozzle (hereinafter abbreviated as a nozzle) (hereinafter abbreviated as gas pressure). .)When,
The distance between the steel plate to be plated and the nozzle (hereinafter abbreviated as the nozzle distance) is controlled as the main operation amount.
【０００３】すなわち、溶融めっき浴から引き上げられ
た被めっき鋼板は、めっき金属が凝固しない内に被めっ
き鋼板の両面側（表面および裏面）に対向配置された一
対のノズルから吹きつけられるガスによってそのめっき
金属付着量（めっき厚み）が制御される。なお、当該技
術分野における先行技術に関しては、次のような文献を
例示することができる。That is, the steel sheet to be plated pulled up from the hot-dip galvanizing bath is blown by a gas blown from a pair of nozzles facing each other on both sides (front surface and back surface) of the steel sheet to be plated while the plating metal does not solidify. The amount of deposited metal (plating thickness) is controlled. Regarding the prior art in this technical field, the following documents can be exemplified.
【０００４】例えば、特公昭57-10948号公報には、溶融
金属メッキラインにおける気体噴射法によるメッキ厚み
（付着量）の調整方法および装置であって、気体噴射圧
力と気体噴射ノズル〜鋼板の間隔をプリセットしてお
き、その後の溶融金属メッキラインからの情報によって
前記の操作量をフィードバック制御するように構成した
もので、特に早い応答性と高い精度とを特徴とするメッ
キ厚み（付着量）制御の方法および装置について開示さ
れている。For example, Japanese Patent Publication No. 57-10948 discloses a method and apparatus for adjusting the plating thickness (adhesion amount) by a gas injection method in a molten metal plating line, wherein the gas injection pressure and the distance between the gas injection nozzle and the steel plate are adjusted. Is preset, and the operation amount is feedback-controlled based on information from the subsequent molten metal plating line. Plating thickness (deposition amount) control characterized by particularly fast response and high accuracy Method and apparatus.
【０００５】また、特公昭56-12316号公報には、気体噴
射圧力、気体噴射ノズル〜鋼板の間隔および溶融金属メ
ッキラインからの情報を操作量とする気体噴射法によっ
て溶融金属メッキラインにおける溶融金属メッキ付着量
を自動的に制御する装置について開示されている。ま
た、特公昭55-34861号公報には、気体噴射圧力、気体噴
射ノズル〜鋼板の間隔および溶融金属メッキラインから
の情報を操作量とする、気体噴射法によって溶融金属メ
ッキ付着量をフイードフオワード制御する溶融金属メッ
キラインにおける溶融金属メッキの付着量自動制御装置
について開示されている。Further, Japanese Patent Publication No. 56-12316 discloses a molten metal in a molten metal plating line by a gas injection method in which a gas injection pressure, a distance between a gas injection nozzle and a steel plate, and information from the molten metal plating line are manipulated variables. An apparatus for automatically controlling the coating weight is disclosed. In addition, Japanese Patent Publication No. 55-34861 discloses that the amount of molten metal plating adhered by a gas injection method is a feed amount, which uses gas injection pressure, a distance between a gas injection nozzle and a steel plate, and information from a molten metal plating line as manipulated variables. A device for automatically controlling the amount of molten metal plating deposited in a word-controlled molten metal plating line is disclosed.
【０００６】また、特開平03-170653 号公報および特開
平03-173756 号公報には、ノズルからの吹きつけガスを
制御する気体噴射法によって、溶融金属めっき付着量を
自動的に制御する方法について開示されている。従来、
溶融金属めっきラインにおけるめっき金属付着量制御の
操作量であるガス圧およびノズル間距離は、近似式ある
いは物理式を用いて設定されている。しかし、ノズル間
距離の直接測定は困難であり、一般的にはノズルの移動
量からノズル間距離を同定する方法、あるいは被めっき
鋼板のパスラインの変動に対応するためノズル近傍に設
置した１台の距離計による測定値をノズル間距離の実績
値としてめっき金属付着量を制御する方法が行なわれて
いる。Further, Japanese Patent Laid-Open No. 03-170653 and Japanese Patent Laid-Open No. 03-173756 disclose a method for automatically controlling the amount of molten metal plating deposited by a gas injection method for controlling a gas blown from a nozzle. It is disclosed. Conventionally,
The gas pressure and the inter-nozzle distance, which are operation amounts for controlling the amount of plated metal adhesion in the molten metal plating line, are set using an approximate expression or a physical expression. However, direct measurement of the distance between nozzles is difficult, and in general, a method of identifying the distance between nozzles from the amount of movement of the nozzles, or one unit installed near the nozzles in order to respond to variations in the pass line of the steel sheet to be plated The method of controlling the amount of plating metal adhesion is performed by using the measured value by the distance meter of No. 3 as the actual value of the distance between nozzles.
【０００７】しかし、この方法では、例えば被めっき鋼
板の進行方向に、被めっき鋼板の反りが発生した場合、
距離計によって測定されたノズル間距離と実際のノズル
間距離との間には誤差が生ずるため、距離計によって測
定されたノズル間距離に対する補正量をあらかじめ決定
しておくという方法を採用している。しかしながら、被
めっき鋼板の形状、板厚、鋼種等により反り量が変動す
るため、この方法でノズル間距離を正確に設定すること
は困難である。したがって、１台の距離計の測定値のみ
でめっき金属付着量の制御を実施すると、ノズル間距離
に誤差を生じ、めっき金属付着量の制御精度も低下す
る。However, in this method, for example, when the steel plate to be plated is warped in the traveling direction of the steel plate to be plated,
Since an error occurs between the distance between nozzles measured by the distance meter and the actual distance between nozzles, the method of determining the correction amount for the distance between nozzles measured by the distance meter in advance is adopted. . However, it is difficult to accurately set the nozzle-to-nozzle distance by this method because the amount of warpage varies depending on the shape, plate thickness, steel type, etc. of the steel plate to be plated. Therefore, if the plating metal adhesion amount is controlled only by the measured value of one distance meter, an error occurs in the nozzle distance, and the control accuracy of the plating metal adhesion amount also decreases.
【０００８】さらに、被めっき鋼板の進行方向の反りの
影響を無視し、距離計の測定値を真値としてめっき金属
付着量の制御を行なった場合、ノズルと被めっき鋼板が
接触して鋼板の品質欠陥やノズルの損傷を招く可能性が
ある。このようなノズルと被めっき鋼板との接触の危険
性を排除するため、あらかじめ、被めっき鋼板の進行方
向の反り量の最大値を予測し、ノズル間距離の下限値を
設定して自動制御する方法も行なわれている。しかし、
この方法では、被めっき鋼板の形状等に拘わらずノズル
間距離の下限値が決定されるので、薄目付化の限界を生
じさせることになる。Further, when the influence of the warp in the traveling direction of the steel sheet to be plated is ignored and the amount of the plated metal adhered is controlled with the measured value of the distance meter as the true value, the nozzle and the steel sheet to be plated contact each other and the This can lead to quality defects and nozzle damage. In order to eliminate such a risk of contact between the nozzle and the steel sheet to be plated, the maximum value of the amount of warp in the traveling direction of the steel sheet to be plated is predicted in advance, and the lower limit value of the distance between nozzles is set and automatically controlled. The method is also done. But,
In this method, the lower limit value of the inter-nozzle distance is determined regardless of the shape of the steel sheet to be plated, etc., so that there is a limit to the weight reduction.
【０００９】[0009]
【発明が解決しようとする課題】本発明は、以上のよう
な従来技術の現状にかんがみてなされたものであって、
特に被めっき鋼板の進行方向の反り量の多少に関わら
ず、正確にノズル間距離を推定することにより、めっき
金属付着量の制御精度を向上させるとともに、ノズルと
被めっき鋼板との接触の危険性を排除して鋼板の品質欠
陥やノズル損傷事故等の削減を図りつつ、かつ薄目付化
操業を実現できる気体噴射法によるめっき金属付着量の
制御方法を提供することを目的としてなされたものであ
る。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional state of the art,
In particular, by accurately estimating the nozzle-to-nozzle distance regardless of the amount of warp in the traveling direction of the steel sheet to be plated, the accuracy of control of the amount of plated metal adhered is improved, and the risk of contact between the nozzle and the steel sheet to be plated is also increased. The purpose of the present invention is to provide a method for controlling the amount of plating metal deposited by the gas injection method, which can eliminate the problem of steel sheet quality defects and nozzle damage accidents, and can realize a light weight operation. .
【００１０】[0010]
【課題を解決するための手段】本発明は、溶融金属めっ
きラインにおける気体噴射法によるめっき金属付着量の
制御方法であって、被めっき鋼板の両面側に対向配置さ
れた一対のワイピングノズルの直上部に距離計を複数台
設置し、該複数台の距離計の測定値に基づいて、被めっ
き鋼板とワイピングノズル間の距離を推定することによ
り、被めっき鋼板の反りに由来する被めっき鋼板とワイ
ピングノズル間の距離の測定誤差を排除することを特徴
とするめっき金属付着量の制御方法である。SUMMARY OF THE INVENTION The present invention is a method for controlling the amount of plating metal deposited by a gas injection method in a hot dip galvanizing line, in which a pair of wiping nozzles disposed opposite to each other on both sides of a steel plate to be plated are provided. A plurality of distance meters are installed on the upper part, and based on the measured values of the plurality of distance meters, by estimating the distance between the steel plate to be plated and the wiping nozzle, the steel plate to be plated resulting from the warp of the steel plate to be plated and A method for controlling the amount of plating metal adhesion is characterized by eliminating a measurement error in the distance between the wiping nozzles.
【００１１】[0011]
【作用】本発明では、被めっき鋼板の進行方向に複数台
の距離計を設置してノズル間距離を推定するように構成
したので、特にコイルの溶接部等、被めっき鋼板に反り
が発生する場合でも、反りに由来する被めっき鋼板とノ
ズル間の距離の測定誤差を排除することができ、めっき
金属付着量の制御精度が大幅に向上する。In the present invention, since a plurality of rangefinders are installed in the traveling direction of the steel sheet to be plated to estimate the distance between nozzles, the steel sheet to be plated is warped especially at the welded portion of the coil. Even in this case, it is possible to eliminate the measurement error of the distance between the steel plate to be plated and the nozzle, which is caused by the warp, and the control accuracy of the amount of plated metal adhered is significantly improved.
【００１２】また、被めっき鋼板の進行方向の反りが発
生した場合も、ノズル間距離が正確に推定されるので、
ノズルと被めっき鋼板の接触を防止できる。Also, when the warp in the traveling direction of the steel sheet to be plated occurs, the distance between the nozzles can be accurately estimated.
It is possible to prevent contact between the nozzle and the steel plate to be plated.
【００１３】[0013]
【実施例】図１は、本発明の制御方法を被めっき鋼板
（ストリップ）の溶融金属めっきライン（溶融亜鉛めっ
き装置）に適用した場合の各種装置の全体配置図であ
る。すなわち、図１で、１は溶融亜鉛めっき槽、２は被
めっき鋼板（ストリップ）、３はめっき槽内に配置され
るシンクロール、４は同じくめっき槽内に配置される被
めっき鋼板のサポートロール、５ａおよび５ｂは対向配
置された一対の気体噴射用のノズル（ワイピングノズ
ル）、６および７はノズル直上部に配置された距離計、
８は演算装置、９はプロセスコンピュータ、１０は溶融
亜鉛めっき槽１内の溶融亜鉛である。なお、矢印は被め
っき鋼板２の搬送方向を示す。FIG. 1 is an overall layout view of various apparatuses when the control method of the present invention is applied to a hot-dip galvanizing line (hot dip galvanizing apparatus) for steel sheets (strips) to be plated. That is, in FIG. 1, 1 is a hot dip galvanizing tank, 2 is a steel plate to be plated (strip), 3 is a sink roll arranged in the plating tank, and 4 is a support roll for the steel plate to be plated which is also arranged in the plating tank. 5a and 5b are a pair of gas injection nozzles (wiping nozzles) arranged opposite to each other, 6 and 7 are distance meters arranged right above the nozzles,
Reference numeral 8 is an arithmetic unit, 9 is a process computer, and 10 is hot-dip zinc in the hot-dip galvanizing tank 1. In addition, the arrow shows the conveyance direction of the steel plate 2 to be plated.
【００１４】操業にあたっては、被めっき鋼板２を一旦
溶融亜鉛めっき槽１に引き入れた後、シンクロール３で
方向転換させてサポートロール４を経由して垂直に引き
上げ、被めっき鋼板２の表面に付着した溶融亜鉛１０の
余剰分を、対向配置された一対のノズル５ａおよび５ｂ
から吹きつけられるガスによって除去して、所要のめっ
き金属付着量に制御する。この際、ノズル直上部に配置
された距離計６および７によって被めっき鋼板の反り量
に影響されることなく、正確にノズル間距離を推定して
いる。In operation, after the steel sheet 2 to be plated is once drawn into the hot dip galvanizing tank 1, the direction is changed by the sink roll 3 and pulled up vertically through the support roll 4 to adhere to the surface of the steel sheet 2 to be plated. The surplus of the molten zinc 10 thus formed is paired with a pair of nozzles 5a and 5b which are arranged opposite to each other
The amount of plating metal deposited is controlled by removing it by the gas blown from. At this time, the distance between the nozzles is accurately estimated by the distance meters 6 and 7 arranged right above the nozzles without being affected by the warp amount of the steel sheet to be plated.
【００１５】図２は、本発明の原理をしめすノズルおよ
び距離計の配置図で、Ｌ1 は距離計７で測定されたノズ
ル間距離( mm) 、Ｌ2 は距離計６で測定されたノズル間
距離( mm) 、Ｈ1 は距離計６とノズル５ａ、５ｂとの高
さの差( mm) 、Ｈ2 は距離計７とノズル５ａ、５ｂとの
高さの差( mm) 、Ｄ1 は距離計設置側のノズル間距離(
mm) 、Ｄ2 は距離計と反対側のノズル間距離( mm) 、ｄ
は被めっき鋼板２の厚み( mm) 、ｌはノズル５ａ、５ｂ
間の距離( mm) である。FIG. 2 is a layout of nozzles and rangefinders showing the principle of the present invention. L 1 is the distance between nozzles (mm) measured by the rangefinder 7, and L 2 is the nozzle measured by the rangefinder 6. Distance (mm), H 1 is the height difference (mm) between the distance meter 6 and the nozzles 5 a, 5 b, H 2 is the height difference (mm) between the distance meter 7 and the nozzles 5 a, 5 b, D 1 Is the distance between the nozzles on the distance meter installation side (
mm), D 2 is the distance between the nozzles on the side opposite to the distance meter (mm), d
Is the thickness (mm) of the steel plate 2 to be plated, l is the nozzle 5a, 5b
The distance (mm) between them.
【００１６】ノズル間距離Ｄ1 は次の（１）式によって
計算する。 Ｄ1 ＝Ｌ2 −（Ｌ2 −Ｌ1 ）×（Ｈ2 ／Ｈ1 ） ……………（１） もう一方のノズル間距離Ｄ2 はノズル５ａ、５ｂ間の距
離ｌが既知なので、被めっき鋼板２の厚みｄを考慮して
（２）式によって容易に計算される。 Ｄ2 ＝ｌ−Ｄ1 −ｄ ……………（２） めっき金属付着量制御の操作量であるノズル間距離とガ
ス圧力はプロセスコンピュータ９によって計算される。
プロセスコンピュータ９では、テーブルより操業条件に
応じて最適なガス圧力を設定し、ノズル間距離の設定値
を（３）式に示す従来のモデル式に従って計算する。The distance D 1 between nozzles is calculated by the following equation (1). D 1 = L 2 − (L 2 −L 1 ) × (H 2 / H 1 ) ... (1) Since the distance D 2 between the other nozzles is the distance 1 between the nozzles 5 a and 5 b, The thickness d of the steel sheet 2 to be plated is easily calculated by the equation (2). D 2 = l−D 1 −d (2) The distance between nozzles and the gas pressure, which are the manipulated variables for controlling the amount of plated metal deposition, are calculated by the process computer 9.
In the process computer 9, the optimum gas pressure is set from the table according to the operating conditions, and the set value of the nozzle-to-nozzle distance is calculated according to the conventional model formula shown in formula (3).
【００１７】演算装置８から出力されるノズル間距離の
実績値がプロセスコンピュータ９によって設定されたノ
ズル間距離と一致するようにノズル間距離を制御するこ
とによって目標とするめっき金属付着量に制御する。 Ｍ＝ａ・Ｄ1 b ・ＬＳc ・Ｐd ・Ｔe ＋ｆ ……………（３） 但し、Ｍ：めっき金属付着量（ｇ／ｍ2 ） ＬＳ：ライン速度（ｍ／ｓｅｃ） Ｔ：被めっき鋼板の温度（℃） Ｐ：ガス圧（ｋｇ／ｃｍ2 ） ａ、ｂ、ｃ、ｄ、ｅ、ｆ：係数 図３は従来法による距離計１台を使用する気体噴射法に
よるめっき金属付着量の制御結果を示し、図４は本発明
を適用して２台の距離計によるめっき金属付着量の制御
結果を示す。ここで目標とするめっき金属付着量は図
３、図４および前、次コイルともに４５ｇ／ｍ2 であ
り、被めっき鋼板２の板厚は、前コイルの１．５ｍｍか
ら次コイルの２．２ｍｍに変化しており、図３、図４中
の縦破線は両コイル溶接点がノズル部を通過した時間を
表す。すなわち、縦破線の左側が１．５ｍｍ板厚の被め
っき鋼板（前コイル）、縦破線の右側が２．２ｍｍ板厚
の被めっき鋼板（次コイル）を表している。By controlling the nozzle-to-nozzle distance so that the actual value of the nozzle-to-nozzle distance output from the arithmetic unit 8 coincides with the nozzle-to-nozzle distance set by the process computer 9, the target plating metal deposition amount is controlled. . M = a · D 1 b · LS c · P d · T e + f ............... (3) where, M: plated metal coating weight (g / m 2) LS: line speed (m / sec) T: Temperature of the steel plate to be plated (° C) P: Gas pressure (kg / cm 2 ) a, b, c, d, e, f: Coefficient FIG. 3 is a plating metal by the gas injection method using one distance meter by the conventional method. FIG. 4 shows the control result of the deposit amount, and FIG. 4 shows the control result of the deposit amount of the plated metal by two distance meters to which the present invention is applied. The target amount of plated metal adhered here is 45 g / m 2 for both the front coil and the next coil in FIGS. 3 and 4, and the plate thickness of the steel plate 2 to be plated is 1.5 mm of the front coil to 2.2 mm of the next coil. The vertical broken line in FIGS. 3 and 4 represents the time when both coil welding points have passed through the nozzle portion. That is, the left side of the vertical broken line represents the 1.5 mm thick steel plate to be plated (front coil), and the right side of the vertical broken line represents the 2.2 mm thick steel plate to be plated (next coil).
【００１８】コイルの溶接点通過時、ノズル位置を固定
しているにもかかわらず、距離計７の出力が９．９ｍｍ
から８．１ｍｍに変化している。これは、既に述べたよ
うに、被めっき鋼板２の板厚変更によりコイルの傾きが
変化したためである。従来法のめっき金属付着量の制御
では、距離計７の出力値を目標値に追従させる。図３に
示すようにノズル間距離の変動分１．８ｍｍに対し、
１．８ｍｍノズル位置補正後のめっき金属付着量の実績
値は、目標値４５ｇ／ｍ2 に対して５１ｇ／ｍ2 となっ
ている。 従来法では、前述のように被めっき鋼板の反
りを考慮していないため、距離計１台の出力を基にする
補正だけでは、めっき金属付着量に誤差を生ずる結果と
なる。When passing through the welding point of the coil, the output of the rangefinder 7 is 9.9 mm even though the nozzle position is fixed.
Has changed from 8.1 mm to 8.1 mm. This is because the coil inclination is changed by changing the plate thickness of the steel plate 2 to be plated, as described above. In the conventional control of the amount of deposited metal, the output value of the distance meter 7 is made to follow the target value. As shown in FIG. 3, for the variation of the distance between the nozzles of 1.8 mm,
Actual values of the plating metal deposition amount after 1.8mm nozzle position correction has a 51 g / m 2 with respect to the target value 45 g / m 2. Since the conventional method does not consider the warp of the steel sheet to be plated as described above, only the correction based on the output of one distance meter results in an error in the amount of plated metal deposited.
【００１９】他方、本発明の制御方法を適用した図４の
例では、２台の距離計の測定値よりノズル間距離の変動
量を０．３ｍｍと推定し、ノズル位置の補正を行ってい
るため、溶接点通過後も目標のめっき金属付着量である
４５ｇ／ｍ2 に精度よく制御されている。以上の結果か
ら、従来法の１台の距離計によるノズル間距離測定と比
較して、本発明の２台の距離計によるめっき金属付着量
の制御方法の方が制御精度がはるかに向上することが確
認できる。さらに上記のように被めっき鋼板の進行方向
の反りが発生した場合にもノズル間距離を精度よく推定
することが可能なため、ノズルと被めっき鋼板の接触を
回避できる限界までノズルを被めっき鋼板に近づけるこ
とができ、ノズル間距離の下限値を一定値とする従来の
方法と比較して、さらに薄目付操業を行うことが可能と
なる。On the other hand, in the example of FIG. 4 to which the control method of the present invention is applied, the variation amount of the distance between nozzles is estimated to be 0.3 mm from the measurement value of two distance meters, and the nozzle position is corrected. Therefore, even after passing through the welding point, the target amount of deposited metal is accurately controlled to 45 g / m 2 . From the above results, the control accuracy of the amount of plated metal deposited by the two rangefinders of the present invention is much higher than that of the conventional method of measuring the distance between nozzles by one rangefinder. Can be confirmed. Further, as described above, since the nozzle-to-nozzle distance can be accurately estimated even when the warp in the traveling direction of the steel sheet to be plated occurs, it is possible to prevent the nozzle from contacting the steel sheet to be coated with the nozzle. It becomes possible to perform even more light weight operation as compared with the conventional method in which the lower limit value of the distance between nozzles is set to a constant value.
【００２０】以上のように、実施例では２台の距離計で
ノズル部の被めっき鋼板の反りを直線近似し、十分な効
果をえたが、３台もしくはそれ以上の台数の距離計を設
置して被めっき鋼板の反りを曲線近似することにより、
さらに制御精度の向上を図ることも可能である。As described above, in the embodiment, the warp of the steel sheet to be plated at the nozzle portion was linearly approximated by two distance meters, and a sufficient effect was obtained. However, three or more distance meters are installed. By approximating the warpage of the steel sheet to be plated with a curve,
Further, it is possible to improve the control accuracy.
【００２１】[0021]
【発明の効果】本発明によると、めっき金属付着量の制
御精度を向上させることができるとともに、ノズルと被
めっき鋼板との接触の危険性を排除して、鋼板の品質欠
陥やノズル損傷事故等の削減を図りつつ、かつ薄目付化
操業を実現することが可能となる。According to the present invention, it is possible to improve the control accuracy of the amount of plated metal adhered, eliminate the risk of contact between the nozzle and the steel sheet to be plated, and to prevent quality defects of the steel sheet, accidents of nozzle damage, etc. It is possible to realize a light weight operation while reducing
【図１】本発明の実施例で使用した装置の全体配置図で
ある。FIG. 1 is an overall layout view of an apparatus used in an embodiment of the present invention.
【図２】本発明の原理をしめすノズルおよび距離計の配
置図である。FIG. 2 is a layout diagram of a nozzle and a range finder showing the principle of the present invention.
【図３】従来法によるめっき金属付着量の制御結果のグ
ラフである。FIG. 3 is a graph showing the control results of the amount of plated metal deposited by the conventional method.
【図４】実施例によるめっき金属付着量の制御結果のグ
ラフである。FIG. 4 is a graph showing a control result of an amount of plated metal deposited according to an example.
１ 溶融亜鉛めっき槽 ２ 被めっき鋼板（ストリップ） ３ シンクロール ４ 浴中サポートロール ５ａ ワイピングノズル ５ｂ ワイピングノズル ６ 距離計 ７ 距離計 ８ 演算装置 ９ プロセスコンピュータ １０ 溶融金属亜鉛 Ｌ1 距離計７で測定されたノズル間距離( mm) Ｌ2 距離計６で測定されたノズル間距離( mm) Ｈ1 距離計６とノズル５ａ、５ｂとの高さの差( mm) Ｈ2 距離計７とノズル５ａ、５ｂとの高さの差( mm) Ｄ1 距離計設置側のノズル間距離( mm) Ｄ2 距離計と反対側のノズル間距離( mm) ｄ 被めっき鋼板２の厚み( mm) ｌ ノズル５、５′間の距離( mm)1 Hot dip galvanizing tank 2 Steel plate (strip) to be plated 3 Sink roll 4 Support roll in bath 5a Wiping nozzle 5b Wiping nozzle 6 Distance meter 7 Distance meter 8 Calculation device 9 Process computer 10 Molten metal zinc L 1 Measured with distance meter 7 Distance between nozzles (mm) Distance between nozzles measured by L 2 distance meter 6 (mm) Height difference between H 1 distance meter 6 and nozzles 5a, 5b (mm) H 2 distance meter 7 and nozzle 5a, Height difference from 5b (mm) D 1 Distance between nozzles on the distance meter installation side (mm) D 2 Distance between nozzles on the opposite side of the distance meter (mm) d Thickness of plated steel plate 2 (mm) l Nozzle 5 Distance between 5 '(mm)
───────────────────────────────────────────────────── フロントページの続き (72)発明者 吉岡 孝之 岡山県倉敷市水島川崎通１丁目（番地な し） 川崎製鉄株式会社水島製鉄所内 (72)発明者 福高 善己 岡山県倉敷市水島川崎通１丁目（番地な し） 川崎製鉄株式会社水島製鉄所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayuki Yoshioka 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi, Okayama Prefecture (no address) Inside Mizushima Works, Kawasaki Steel Co., Ltd. (72) Yoshimi Fukutaka Mizushima-kawasaki-dori, Kurashiki-shi, Okayama 1 chome (without street number) Kawasaki Steel Works Mizushima Steel Works
Claims (1)
法によるめっき金属付着量の制御方法であって、被めっ
き鋼板の両面側に対向配置された一対のワイピングノズ
ルの直上部に距離計を複数台設置し、該複数台の距離計
の測定値に基づいて、被めっき鋼板とワイピングノズル
間の距離を推定することにより、被めっき鋼板の反りに
由来する被めっき鋼板とワイピングノズル間の距離の測
定誤差を排除することを特徴とするめっ金属付着量の制
御方法。1. A method of controlling the amount of plating metal deposited by a gas injection method in a hot-dip galvanizing line, wherein a plurality of distance meters are installed directly above a pair of wiping nozzles that are arranged opposite to each other on both sides of a steel plate to be plated. Then, based on the measured values of the plurality of rangefinders, by estimating the distance between the steel plate to be plated and the wiping nozzle, the measurement error of the distance between the steel plate to be plated and the wiping nozzle resulting from the warp of the steel plate to be plated A method for controlling the amount of adhered metal, which is characterized by eliminating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6232094A JPH07268588A (en) | 1994-03-31 | 1994-03-31 | How to control the amount of plated metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6232094A JPH07268588A (en) | 1994-03-31 | 1994-03-31 | How to control the amount of plated metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07268588A true JPH07268588A (en) | 1995-10-17 |
Family
ID=13196740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6232094A Pending JPH07268588A (en) | 1994-03-31 | 1994-03-31 | How to control the amount of plated metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07268588A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101130483B1 (en) * | 2007-03-07 | 2012-06-13 | 지멘스 바이 메탈스 테크놀로지 에스에이에스 | Method and equipment for the continuous deposition of a coating on a strip type substrate |
| KR101688384B1 (en) * | 2015-07-08 | 2016-12-21 | 주식회사 성화이앤씨 | Control Method of Coating Thickness of molten metal in Continuous Galvanizing Line |
| KR101879107B1 (en) * | 2016-12-23 | 2018-07-16 | 주식회사 포스코 | Thickness control apparatus for coating layer of steel plate |
| CN118600354A (en) * | 2024-08-08 | 2024-09-06 | 黄山学院 | An adaptive air knife control method, device and system for high-strength steel hot-dip galvanizing process |
-
1994
- 1994-03-31 JP JP6232094A patent/JPH07268588A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101130483B1 (en) * | 2007-03-07 | 2012-06-13 | 지멘스 바이 메탈스 테크놀로지 에스에이에스 | Method and equipment for the continuous deposition of a coating on a strip type substrate |
| KR101688384B1 (en) * | 2015-07-08 | 2016-12-21 | 주식회사 성화이앤씨 | Control Method of Coating Thickness of molten metal in Continuous Galvanizing Line |
| KR101879107B1 (en) * | 2016-12-23 | 2018-07-16 | 주식회사 포스코 | Thickness control apparatus for coating layer of steel plate |
| CN118600354A (en) * | 2024-08-08 | 2024-09-06 | 黄山学院 | An adaptive air knife control method, device and system for high-strength steel hot-dip galvanizing process |
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