JPH051360A - Method for coating hot-dip metal coating steel sheet - Google Patents
Method for coating hot-dip metal coating steel sheetInfo
- Publication number
- JPH051360A JPH051360A JP3180420A JP18042091A JPH051360A JP H051360 A JPH051360 A JP H051360A JP 3180420 A JP3180420 A JP 3180420A JP 18042091 A JP18042091 A JP 18042091A JP H051360 A JPH051360 A JP H051360A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- frequency current
- steel plate
- steel
- current conducting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は連続溶融亜鉛めっき等の
溶融金属めっきにおいて、鋼板に付着した溶融金属をワ
イピングし、めっき鋼板の目付を行うための方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for wiping molten metal adhering to a steel sheet and performing coating weight of the plated steel sheet in hot metal galvanizing such as continuous hot dip galvanizing.
【０００２】[0002]
【従来技術】連続溶融めっき処理では、図２０に示すよ
うに溶融めっき浴１中のシンクロ−ル６に巻付搬送され
る鋼板Ｓが、押えおよび板反り矯正用のピンチロ−ル７
を経て上方に引き上げられた後、通常、めっき浴面上で
ガスワイピングノズル８により余剰めっき分を絞り取ら
れ、均一なめっき厚を得るようにしている。2. Description of the Related Art In a continuous hot dip coating process, a steel plate S wound and conveyed around a synchronizer 6 in a hot dip bath 1 is held by a pinch roll 7 for pressing and straightening the warp as shown in FIG.
After being pulled up, the gas wiping nozzle 8 usually squeezes out the surplus plating on the surface of the plating bath to obtain a uniform plating thickness.
【０００３】このようなめっき処理において、生産性を
上げるために板の通板速度を上げようとすると、鋼板Ｓ
に付随して上方に持ち上げられる溶融金属量が必然的に
多くなるため、ガスワイピングノズル８のガス圧を高め
る必要がある。しかし、このようにガスワイピングノズ
ル８のガス圧を高めると、高速で板に衝突したガスジェ
ットは余分な溶融金属を下方に掻き落すだけでなく、随
伴ガス流を発生させ、この随伴ガス流により溶融金属の
一部がスプラッシュとなり、これがガスワイピングノズ
ルに付着してノズル詰りを生じさせ、この結果ガス流の
均一性が阻害され、めっき目付量を均一にすることがで
きなくなる。このようにめっき目付量が不均一である
と、美観上の問題のみならず、めっき後の合金化の不均
一化や巻取時の荷崩れの原因となる。また、スプラッシ
ュの一部は鋼板に再付着し、鋼板傷の原因となる等の問
題もある。また、ガスワイピングノズルのガス流量を増
大させることは、コストアップや騒音発生の要因ともな
る。In such a plating process, if an attempt is made to increase the plate passing speed in order to increase productivity, the steel plate S
As a result, the amount of molten metal that is lifted upward inevitably increases, so the gas pressure of the gas wiping nozzle 8 must be increased. However, when the gas pressure of the gas wiping nozzle 8 is increased in this way, the gas jet that collides with the plate at a high speed not only scrapes off the excess molten metal downward, but also generates an associated gas flow, and this associated gas flow A part of the molten metal becomes splash, which adheres to the gas wiping nozzle to cause nozzle clogging, and as a result, the uniformity of the gas flow is impaired and the coating weight cannot be made uniform. Such a non-uniform coating weight causes not only aesthetic problems, but also non-uniform alloying after plating and load collapse during winding. There is also a problem that part of the splash redeposits on the steel plate, causing damage to the steel plate. In addition, increasing the gas flow rate of the gas wiping nozzle also causes a cost increase and noise generation.
【０００４】従来、高速化に対応するために余剰な溶融
金属を絞り取る方法に関し、以下のような提案がなされ
ている。 特公昭４４−７４４４号に示されるように、鋼板に高
周波磁場を印加し、鋼板に発生する渦電流に伴うロ−レ
ンツ力を利用して溶融金属を絞り、且つガスワイピング
を併用する方法 特開昭６１−２２７１５８号に示されるように、鋼板
に定常電流を流し、静磁場とのロ−レンツ力により余剰
溶融金属を下方に絞った後、ガスワイピングノズルに到
らしめる方法 特開昭６１−２０４３６３号に示されるように、鋼板
の面外方向に静磁場を発生させ、鋼板の移動により発生
する溶融金属中の誘導電流と静磁場とのロ−レンツ力に
より、余剰の溶融金属を下方に絞った後、ガスワイピン
グノズルに到らしめる方法 特開昭６１−２６６５６０号や特開昭６２−１０３３
３３号に示されるように、鋼板下方向に移動磁界を発生
させ余剰溶融金属を下方に絞った後、ガスワイピングノ
ズルに到らしめる方法Conventionally, the following proposals have been made regarding a method of squeezing out excess molten metal in order to cope with speeding up. As disclosed in Japanese Examined Patent Publication No. 44-7444, a method of applying a high frequency magnetic field to a steel sheet, squeezing the molten metal by utilizing Lorentz force associated with an eddy current generated in the steel sheet, and using gas wiping together As disclosed in Japanese Patent Laid-Open No. 227158/1986, a method in which a stationary current is passed through a steel sheet to squeeze the excess molten metal downward by Lorentz force with a static magnetic field and then reaches a gas wiping nozzle. As shown in No. 204363, a static magnetic field is generated in the out-of-plane direction of the steel sheet, and the excess current of the molten metal is lowered by the Lorentz force between the induced current in the molten metal generated by the movement of the steel sheet and the static magnetic field. Method of reaching the gas wiping nozzle after squeezing. JP-A 61-266560 and JP-A 62-1033.
No. 33, a method of generating a moving magnetic field in the downward direction of a steel sheet and squeezing surplus molten metal downward, and then arriving at a gas wiping nozzle.
【０００５】[0005]
【発明が解決しようとする課題】しかし、これらの方法
の最大の欠点は、特に鋼板などの強磁性体に磁場を作用
させる際、鋼板は磁場の強い方に引き付けられるために
不安定な系となり、目的とするような適正な制御を行う
ことが難しいという点にある。このような制御上の問題
を回避するためには、磁場発生装置と鋼板との間隔を広
く取る必要があり、この結果、磁場の効果が極めて限定
されてしまい、本来目的としているような効果は十分に
得られない。However, the biggest drawback of these methods is that, when a magnetic field is applied to a ferromagnetic material such as a steel sheet, the steel sheet is attracted to the strong magnetic field, resulting in an unstable system. However, it is difficult to perform proper control as intended. In order to avoid such a control problem, it is necessary to widen the gap between the magnetic field generator and the steel plate, and as a result, the effect of the magnetic field is extremely limited, and the effect originally intended is not achieved. I can't get enough.
【０００６】また、溶融金属の目付量の均一化を阻害す
る要因として、鋼板の振動や幅方向での板反り（所謂Ｃ
反り）があるが、上述したいずれの提案も鋼板の制振や
板反り矯正には全く効果がない。上記の特公昭４４−
７４４４号には、コイル間を通過する鋼板は磁気的な反
発力でコイル間中心にセンタリングされるという、鋼板
の振動抑制効果が期待し得るような内容が示されている
が、上述したように単に鋼板に高周波磁場を印加した場
合には、強磁性体である鋼板に磁気的吸引力が強く作用
するため、通板する鋼板がコイル方向に吸引される等、
却って不安定な状態が引き起こされ、振動の抑制等は全
く期待できない。Further, as factors that hinder the uniforming of the weight per unit area of the molten metal, vibration of the steel sheet and plate warpage in the width direction (so-called C
However, none of the above-mentioned proposals has any effect on the vibration control of the steel plate and the correction of the plate warp. The above Japanese Patent Publication No.44-
No. 7444 describes that a steel sheet passing between coils is centered between the coils by a magnetic repulsive force, which is expected to have a vibration suppressing effect on the steel sheet. When a high-frequency magnetic field is simply applied to the steel sheet, the magnetic attraction force strongly acts on the steel sheet that is a ferromagnetic body, so that the steel sheet to be passed is attracted in the coil direction, etc.
On the contrary, an unstable state is caused, and vibration suppression etc. cannot be expected at all.
【０００７】このように従来の方法では、強磁性の鋼板
が磁場により吸引され、不安定な系となるという根本的
な問題があり、このため本来目的とするような十分な作
用が期待できないという欠点があった。本発明はこのよ
うな従来の問題に鑑みなされたもので、溶融めっき鋼板
の板反りや振動を防止しつつ、高速かつ均一な目付を可
能とする方法を提供しようとするものである。As described above, the conventional method has a fundamental problem that a ferromagnetic steel sheet is attracted by a magnetic field to form an unstable system. Therefore, it is not possible to expect a sufficient effect as originally intended. There was a flaw. The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a method capable of high-speed and uniform basis weight while preventing the warp and vibration of the hot-dip galvanized steel sheet.
【０００８】[0008]
【課題を解決するための手段】鋼板のような強磁性体に
単に磁場を印加し、鋼板の制振やめっき目付を行おうと
しても、鋼板に磁気吸引力が作用し、鋼板がより不安定
な状態におかれることは、上述した通りである。このよ
うな問題に対し本発明者らは、図１２のＢ〜Ｈ曲線に示
されるように鋼板の強磁性を示す領域が非飽和域に限ら
れ、飽和域では強磁性でなくなることに着目し、鋼板を
十分に飽和させた状態で高周波磁場を印加すれば、磁気
吸引力よりも高周波電流路を流れる電流と鋼板中の誘導
電流間に生じる反発力の方が強くなり、上記磁気吸引力
に伴う不安定性が解消されることを見出し、本発明を完
成させたものである。[Means for Solving the Problems] Even if a magnetic field is simply applied to a ferromagnetic material such as a steel plate to suppress the vibration of the steel plate or to provide a coating weight, the magnetic attraction force acts on the steel plate, making the steel plate more unstable. It is as described above that it is put in such a state. With respect to such a problem, the present inventors have noticed that the region showing the ferromagnetism of the steel sheet is limited to the non-saturation region as shown by the curves B to H in FIG. , If a high-frequency magnetic field is applied while the steel sheet is sufficiently saturated, the repulsive force generated between the current flowing through the high-frequency current path and the induced current in the steel sheet becomes stronger than the magnetic attractive force, and The inventors have found that the instability that accompanies it is eliminated and completed the present invention.
【０００９】すなわち本発明は、溶融めっき浴の浴面上
方において、溶融めっき浴から引き出される鋼板の前面
側および後面側に、鋼板を挾んで略対向するようにして
鋼板面に平行な高周波電流導通路を鋼板面に近接して配
置するとともに、該高周波電流導通路近傍における鋼板
幅方向の両側外方に、鋼板幅方向を挾んで略対向するよ
うにして磁石のＮ極およびＳ極を配置し、該磁石により
鋼板を磁気的に十分飽和させた状態で、鋼板前面側およ
び後面側の前記高周波電流導通路に同位相の高周波電流
を通電して鋼板に逆位相の高周波電流を誘導させ、この
誘導電流と前記各高周波電流導通路の高周波電流との相
互作用により鋼板面に働く磁気圧力を発生させ、鋼板に
その両面側から作用する前記磁気圧力により、鋼板の幅
方向での板反りと振動を防止しつつ鋼板に付着した溶融
金属をワイピングし、鋼板のめっき目付を行うようにし
たものである。That is, according to the present invention, above the bath surface of the hot dip coating bath, a high-frequency current conductor parallel to the steel sheet surface is sandwiched between the front and rear surfaces of the steel sheet drawn out from the hot dipping bath so that they face each other. The passage is arranged close to the steel plate surface, and the N pole and the S pole of the magnet are arranged outside the both sides of the steel plate width direction in the vicinity of the high-frequency current conducting path so as to face each other across the steel plate width direction. , In a state where the steel sheet is magnetically sufficiently saturated by the magnet, high-frequency currents of the same phase are applied to the high-frequency current conducting paths on the front and rear sides of the steel sheet to induce high-frequency currents of opposite phases in the steel sheet. A magnetic pressure acting on the steel sheet surface is generated by the interaction between the induced current and the high-frequency current of each of the high-frequency current conducting paths, and the magnetic pressure acting on the steel sheet from both sides thereof causes a warp in the width direction of the steel sheet. The molten metal adhering to the steel sheet while preventing movement wipes, is obtained to perform the plating weight of the steel sheet.
【００１０】このような本発明において、高周波電流導
通路は鋼板通板方向で間隔をおいて２以上設けることが
できる。また、鋼板幅方向を挾んで対向するようにして
配置される磁石は、電磁石および永久磁石のいずれを用
いてもよく、また、この磁石も鋼板通板方向において２
箇所以上の位置に配置することができる。In the present invention as described above, two or more high frequency current conducting paths can be provided at intervals in the steel sheet passing direction. Further, the magnets arranged so as to face each other across the width direction of the steel plate may be either electromagnets or permanent magnets, and this magnet also has a width of 2 mm in the steel plate passing direction.
It can be placed in more than one place.
【００１１】高周波電流導通路は、鋼板幅方向に亘って
設ける必要があるが、必ずしも板幅方向と平行に設ける
必要はなく、高周波電流導通路全長に板幅方向に対して
傾きをもたせ、或いは高周波電流導通路の一部に板幅方
向に対して傾きをもたせるような構成とすることができ
る。鋼板エッジ部では、高周波電流導通路を流れる電流
に対して鋼板中を流れる電流の方向が９０°の関係にな
るため、このエッジ部近傍で磁気圧力が弱まる傾向があ
り、このような問題に対しては、上記のように高周波電
流導通路全長に板幅方向に対して傾きをもたせ、或いは
電流導通路の鋼板エッジ部近傍に面した部分に板幅方向
に対して傾きをもたせた構成とするのが有効である。The high-frequency current conducting path needs to be provided in the width direction of the steel plate, but it is not necessarily required to be provided in parallel with the width direction of the steel plate. It is possible to adopt a configuration in which a part of the high-frequency current conducting path is inclined with respect to the plate width direction. At the edge of the steel sheet, the direction of the current flowing through the steel sheet is 90 ° with respect to the current flowing through the high-frequency current conducting path, so the magnetic pressure tends to weaken near this edge. As described above, the entire length of the high-frequency current conducting path is inclined with respect to the plate width direction, or the portion facing the vicinity of the steel plate edge portion of the current conducting path is inclined with respect to the plate width direction. Is effective.
【００１２】[0012]
【作用】本発明法の作用を、強磁性体である鋼板の磁気
特性を示す図１２（磁束密度と磁界の強さの関係図）と
本発明の一実施例である図１および図２に基づき説明す
る。図１は実施状況を示す側面図、図２は同じく正面図
である。The operation of the method of the present invention is shown in FIG. 12 (relationship diagram between magnetic flux density and magnetic field strength) showing the magnetic characteristics of a steel sheet which is a ferromagnetic material and FIGS. 1 and 2 showing an embodiment of the present invention. It will be explained based on. FIG. 1 is a side view showing an implementation state, and FIG. 2 is a front view of the same.
【００１３】本発明法では、溶融めっき浴１の浴面上方
において、溶融めっき浴１から引き出され連続通板する
鋼板Ｓの前面側および後面側に、鋼板を挾んで略対向す
るようにして、鋼板面に平行な高周波電流導通路２ａ、
２ｂを鋼板Ｓに近接して配置するとともに、鋼板Ｓの幅
方向の両側外方に、鋼板幅方向を挾んで略対向するよう
にして永久磁石または電磁石からなる磁石３のＮ極およ
びＳ極を配置する。この例では、鋼板両側の高周波電流
導通路２ａ、２ｂは上下２段に配され、上部の高周波電
流導通路２ａ、２ｂの上方近傍位置と下部の高周波電流
導通路２ａ、２ｂの下方近傍位置に、それぞれ磁石３が
配されている。In the method of the present invention, above the bath surface of the hot dip plating bath 1, the front and rear surfaces of the steel plate S drawn out from the hot dip bath 1 and continuously threaded are sandwiched so as to substantially oppose each other. High-frequency current conducting path 2a parallel to the steel plate surface,
2b is arranged close to the steel plate S, and the N pole and the S pole of the magnet 3 made of a permanent magnet or an electromagnet are arranged on both outer sides in the width direction of the steel plate S so as to face each other across the steel plate width direction. Deploy. In this example, the high-frequency current conducting paths 2a, 2b on both sides of the steel plate are arranged in two steps, that is, in the upper vicinity of the upper high-frequency current conducting paths 2a, 2b and in the lower vicinity of the lower high-frequency current conducting paths 2a, 2b. , The magnets 3 are arranged respectively.
【００１４】鋼板Ｓを挾んで対向する高周波電流導通路
２ａ、２ｂに同位相の高周波電流を流すと、鋼板Ｓには
これと逆位相の電流が流れる。この鋼板Ｓを流れる電流
は前記高周波電流導通路２ａ、２ｂの電流とは方向が逆
となるため、磁気的な反発作用すなわち磁気圧力が鋼板
表面に作用する。しかしながら、鋼板のような強磁性体
では透磁率が高いため、上述したように単に電流が流れ
ただけでは、磁気的吸引力が反発力を上回り、不安定な
系となってしまう。鋼板両端に配置した磁石３はこのよ
うな不安定性を除去するため、鋼板を磁気的に飽和させ
る作用をする。すなわち、この磁石の作用により鋼板中
の磁場は図１２に示す磁気的な飽和域に存在することに
なり、高周波電流によって発生する磁場変動の範囲も図
１２で示す磁気飽和域の中に存在することになる。この
ように強磁性体を磁気的に飽和させ常磁性化することに
より、磁気的吸引力による不安定性を解消でき、鋼板は
高周波電流導通路からの反発力のみを受けることにな
る。すなわち、この作用は図１３に示すような非接触の
バネと同じような作用であり、これにより鋼板の振動が
抑制され、また、板反りも矯正される。そして、このよ
うに鋼板の制振および板反りの矯正がなされた状況下
で、鋼板両面側から作用する溶融金属への磁気圧力によ
り、鋼板に付着している余剰の溶融金属が絞り落され、
極めて均一な目付が可能となる。When a high-frequency current having the same phase is passed through the high-frequency current conducting paths 2a, 2b that are opposed to each other across the steel sheet S, a current having an opposite phase to the high-frequency current flows through the steel sheet S. Since the current flowing through the steel sheet S has a direction opposite to that of the current in the high-frequency current conducting paths 2a, 2b, magnetic repulsion, that is, magnetic pressure acts on the steel sheet surface. However, since a ferromagnetic material such as a steel plate has a high magnetic permeability, the magnetic attractive force exceeds the repulsive force and the system becomes unstable if only a current flows as described above. The magnets 3 arranged at both ends of the steel plate remove such instability, and thus act to magnetically saturate the steel plate. That is, due to the action of this magnet, the magnetic field in the steel sheet exists in the magnetic saturation region shown in FIG. 12, and the range of the magnetic field fluctuation generated by the high frequency current also exists in the magnetic saturation region shown in FIG. It will be. By thus magnetically saturating the ferromagnetic material and making it paramagnetic, the instability due to the magnetic attraction force can be eliminated, and the steel sheet receives only the repulsive force from the high-frequency current conducting path. That is, this action is similar to that of the non-contact spring as shown in FIG. 13, whereby the vibration of the steel plate is suppressed and the plate warp is also corrected. Then, under the condition that the vibration and the warp of the steel plate are corrected in this manner, the excess molten metal adhering to the steel plate is squeezed out by the magnetic pressure to the molten metal acting from both sides of the steel plate,
An extremely uniform basis weight is possible.
【００１５】[0015]
【実施例】図１ないし図１１に本発明の実施例を示す。
このうち図１および図２は、上述したように鋼板Ｓを挾
んで対向するようにして鋼板面に平行な高周波電流導通
路２ａ、２ｂを上下方向で２組配し、これら２組の高周
波電流導通路の上部近傍位置および下部近傍位置に、鋼
板幅方向を挟むようにしてそれぞれ磁石３（永久磁石）
のＮ極、Ｓ極を配したものである。鋼板Ｓを挟んで対向
する高周波電流導通路２ａ、２ｂには、同位相の高周波
電流が流される。なお、この例では上下の高周波電流導
通路の電流の位相は反対となっているが、同位相でもよ
い。1 to 11 show an embodiment of the present invention.
Of these, in FIG. 1 and FIG. 2, two sets of high-frequency current conducting paths 2a and 2b parallel to the steel plate surface are arranged in the vertical direction so as to face each other across the steel plate S as described above. Magnets 3 (permanent magnets) sandwiching the width direction of the steel plate at positions near the top and bottom of the conduction path, respectively.
The N and S poles are arranged. High-frequency currents of the same phase are passed through the high-frequency current conducting paths 2a, 2b that face each other across the steel plate S. In this example, the phases of the currents in the upper and lower high-frequency current conducting paths are opposite to each other, but they may have the same phase.
【００１６】図３および図４は、上下２組の高周波電流
導通路２ａ、２ｂの間に磁石３のＮ極、Ｓ極を配したも
のであり、上下の高周波電流導通路に流す電流について
は上記実施例と同様である。図５および図６は、図１お
よび図２に示されると同様の高周波電流導通路および磁
石配置構成において、磁石３を電磁石で構成したもので
あり、４は電磁石を構成するヨ−ク、５は同じくコイル
である。3 and 4 show the N pole and the S pole of the magnet 3 disposed between the upper and lower two sets of high frequency current conducting paths 2a and 2b. This is similar to the above embodiment. 5 and 6 show the same high-frequency current conducting path and magnet arrangement as shown in FIGS. 1 and 2, in which the magnet 3 is constituted by an electromagnet, and 4 is a yoke constituting the electromagnet. Is also a coil.
【００１７】図７および図８は、それぞれ鋼板の端部に
特に強い磁気圧力をかけるため、各高周波電流導通路２
の鋼板エッジ部近傍と対向する部分に、鋼板通板方向に
沿った屈曲部２１を形成したものである。この実施例で
も高周波電流導通路は上下２組設けられ、磁石３はこの
上下の高周波電流導通路間に配されている。このような
構成は上述した各実施例に適用可能である。7 and 8 respectively apply a particularly strong magnetic pressure to the ends of the steel sheet, so
The bent portion 21 is formed in the portion facing the vicinity of the steel plate edge portion along the steel plate passing direction. Also in this embodiment, two sets of high-frequency current conducting paths are provided above and below, and the magnet 3 is arranged between the upper and lower high-frequency current conducting paths. Such a configuration is applicable to each of the above-described embodiments.
【００１８】また、鋼板エッジ部では、高周波電流導通
路を流れる電流に対して鋼板中を流れる電流の方向が９
０°の関係になるため、このエッジ部近傍で磁気圧力が
弱まる傾向があり、このような問題に対しては、高周波
電流導通路全長を板幅方向に対して傾け、或いは電流導
通路の鋼板エッジ部近傍と対向する部分に板幅方向に対
し傾きをもたせる方法が有効である。図９および図１０
は前者の場合の電流導通路の配置例を示すもので、鋼板
両側の高周波電流導通路２ａ，２ｂの全長に板幅方向に
対して適当な傾きをもたせたものである。また、図１１
は鋼板エッジ部近傍に面した高周波電流導通路２ａ，２
ｂの部分２２に板幅方向に対する傾きをもたせたもので
ある。以上のような構成は上記各実施例に適用可能であ
る。At the edge of the steel sheet, the direction of the current flowing through the steel sheet is 9 with respect to the current flowing through the high frequency current conducting path.
Since the relationship is 0 °, the magnetic pressure tends to weaken in the vicinity of this edge portion. To solve such a problem, the high frequency current conducting path is inclined with respect to the plate width direction, or the steel sheet of the current conducting path is inclined. It is effective to provide a portion facing the vicinity of the edge with an inclination in the plate width direction. 9 and 10
Shows an example of the arrangement of the current conducting paths in the former case, in which the entire lengths of the high frequency current conducting paths 2a and 2b on both sides of the steel sheet are given an appropriate inclination with respect to the width direction of the sheet. In addition, FIG.
Is a high-frequency current conducting path 2a, 2 facing the edge of the steel plate
The portion 22 of b has an inclination with respect to the plate width direction. The configuration as described above is applicable to each of the above embodiments.
【００１９】本発明者らは、本発明の効果を検証するた
め以下のようなシュミレ−ション解析を行った。この解
析では、まず第１に電磁石により鋼板が磁気的に飽和す
ることを確認するため、図５および図６に示すような装
置構成における電磁石と鋼板の静磁場解析を行った。図
１４に解析モデルを示すが、ここでは対称性を考慮し、
１／２のモデルで解析を行った。その解析条件は以下の
通りである。 鉄芯比透磁率：１０００ コイル電流 ：２．６×１０5ＡＴ 鋼板寸法 ：幅１８００ｍｍ×板厚２．３ｍｍThe present inventors conducted the following simulation analysis in order to verify the effect of the present invention. In this analysis, firstly, in order to confirm that the steel sheet is magnetically saturated by the electromagnet, a static magnetic field analysis of the electromagnet and the steel sheet in the apparatus configuration as shown in FIGS. 5 and 6 was performed. An analysis model is shown in FIG. 14. Here, considering symmetry,
Analysis was performed with a model of 1/2. The analysis conditions are as follows. Iron core relative permeability: 1000 Coil current: 2.6 × 10 5 AT Steel plate dimensions: 1800 mm width × 2.3 mm plate thickness
【００２０】図１５に解析で得られた磁界の分布を示
す。ここで得られた磁性体中の磁界の強さは１．６×１
０5Ａ／ｍ以上を示しており、鋼板が磁気的に十分に飽
和していること、つまり、鋼板が図１２の飽和域にある
ことを示している。FIG. 15 shows the distribution of the magnetic field obtained by the analysis. The magnetic field strength in the magnetic material obtained here is 1.6 × 1.
0 5 A / m or more, indicating that the steel sheet is magnetically sufficiently saturated, that is, the steel sheet is in the saturation region of FIG.
【００２１】次に、高周波電流導通路によって鋼板に及
ぼされる磁気圧力を算定するためのシュミレ−ションを
行った。図１６に解析したモデルを示す。各高周波電流
導通路には図５に示すような位相の電流が流れると想定
し、対称性を考慮し１／２のモデルで解析を行った。そ
の解析条件は以下の通りである。鋼板は磁気的に飽和し
ているため鋼板の比透磁率は１とした。 コイル断面寸法：３０×５０ｍｍ コイル電流 ：３×１０4Ａ 周波数 ：３０００Ｈｚ 鋼板厚 ：２．３ｍｍ 鋼板比透磁率 ：１Next, a simulation for calculating the magnetic pressure exerted on the steel sheet by the high frequency current conducting path was performed. FIG. 16 shows the analyzed model. Assuming that a current having a phase as shown in FIG. 5 flows in each high-frequency current conducting path, analysis was performed with a model of 1/2 in consideration of symmetry. The analysis conditions are as follows. Since the steel sheet is magnetically saturated, the relative permeability of the steel sheet was set to 1. Coil cross section size: 30 × 50 mm Coil current: 3 × 10 4 A Frequency: 3000 Hz Steel plate thickness: 2.3 mm Steel plate relative permeability: 1
【００２２】この解析では鋼板が対向する高周波電流導
通路間で振動することを考え、図１６に示すように鋼板
が両電流導通路のセンタ位置にある場合と、このセンタ
位置からそれぞれ５ｍｍ、１０ｍｍずつずれた場合の３
水準について解析を行った。図１７は鋼板が両電流導通
路のセンタ位置にある場合、また、図１８および図１９
は鋼板がセンタ位置よりそれぞれ５ｍｍ、１０ｍｍずれ
た場合の各磁気圧力の分布を示している。これによれ
ば、鋼板がセンタ位置からずれた場合、全体としてセン
タ位置へ押しやろうとする磁気圧力が働くことが示され
ている。この磁気圧力は高周波電流導通路に鋼板が近づ
くにしたがって大きくなるため、鋼板のセンタリング作
用に有効に働き、振動防止に効果がある。また、Ｃぞり
の矯正力としても有効で、ト−タルのＣぞり量を０．５
ｍｍ以内に押えられることが判る。In this analysis, considering that the steel sheet vibrates between the high frequency current conducting paths facing each other, as shown in FIG. 16, the steel sheet is located at the center position of both current conducting paths, and 5 mm and 10 mm from this center position, respectively. 3 when shifting
The level was analyzed. FIG. 17 shows a case where the steel plate is in the center position of both current conducting paths, and FIG.
Shows the distribution of each magnetic pressure when the steel plate is deviated from the center position by 5 mm and 10 mm, respectively. According to this, when the steel plate deviates from the center position, the magnetic pressure acts to push the steel plate to the center position as a whole. This magnetic pressure increases as the steel sheet approaches the high-frequency current conducting path, so that it effectively acts on the centering action of the steel sheet and is effective in preventing vibration. It is also effective as a correction force for C warping, and the total amount of C warping is 0.5.
It can be seen that it can be pressed within mm.
【００２３】また、図１７に示すように磁気圧力は最大
１３４５２Ｐａあり、鋼板表面の溶融金属のワイピング
に十分な圧力であることが判った。これらの結果を踏ま
え、図２０に示すような従来のめっき設備において、ガ
スワイピングノズル８に代えて図５および図６に相当す
る装置をめっき浴面上４００ｍｍの位置に設置し、溶融
亜鉛めっき鋼板の目付を実施した。この実験では、鋼板
の板幅、電流条件は上記のシュミレ−ション解析と同様
とし、ラインスピ−ドを１５０ｍ／ｍｉｎに設定して行
った。Further, as shown in FIG. 17, the maximum magnetic pressure was 13452 Pa, which was found to be sufficient for wiping the molten metal on the surface of the steel sheet. Based on these results, in the conventional plating equipment as shown in FIG. 20, instead of the gas wiping nozzle 8, an apparatus corresponding to FIG. 5 and FIG. Was carried out. In this experiment, the plate width of the steel plate and the current conditions were the same as in the above simulation analysis, and the line speed was set to 150 m / min.
【００２４】この結果、本発明法によるワイピング箇所
における鋼板のＣ反りは完全に矯正され、振動も１ｍｍ
以内の振幅に押えることができ、また、ガスワイピング
ノズルを使用した場合のようなスプラッシュや騒音の発
生もなく、極めて均一なめっき目付を行うことができ
た。また、従来のガスワイピング方式において１５０ｍ
／ｍｉｎのラインスピ−ドでは困難であった３５ｇ／ｍ
2の目付の亜鉛めっきも容易に実施可能であることが確
認できた。なお、以上述べたように本発明法はそれ自体
で溶融めっきの目付を行うことができるものであるが、
従来のガスワイピングノズルによるめっき絞りと併用す
ることを妨げるものではない。As a result, the C-warp of the steel sheet at the wiping point according to the method of the present invention was completely corrected and the vibration was 1 mm.
It was possible to suppress the amplitude within the range, and it was possible to carry out extremely uniform plating areal without generation of splash and noise as in the case of using the gas wiping nozzle. Also, 150m in the conventional gas wiping method
35 g / m, which was difficult with a line speed of 1 / min
It was confirmed that galvanization with a unit weight of 2 can be easily performed. As described above, the method of the present invention can perform the basis weight of hot dip plating by itself,
It does not prevent its use in combination with the conventional plating diaphragm using a gas wiping nozzle.
【００２５】[0025]
【発明の効果】以上述べた本発明によれば、従来連続溶
融めっきの高速化でネックとなっていたガスワイピング
ノズル回りの問題を解消し、均一な膜厚の高速めっきを
可能とするものである。According to the present invention described above, the problem around the gas wiping nozzle, which has been a bottleneck in the speedup of continuous hot-dip plating in the past, is solved, and high-speed plating with a uniform film thickness is made possible. is there.
【図１】本発明の一実施例を示す側面図FIG. 1 is a side view showing an embodiment of the present invention.
【図２】図１に示す実施例の正面図FIG. 2 is a front view of the embodiment shown in FIG.
【図３】本発明の他の実施例を示す側面図FIG. 3 is a side view showing another embodiment of the present invention.
【図４】図３に示す実施例の正面図4 is a front view of the embodiment shown in FIG.
【図５】本発明の他の実施例を示す側面図FIG. 5 is a side view showing another embodiment of the present invention.
【図６】図５に示す実施例の正面図6 is a front view of the embodiment shown in FIG.
【図７】本発明の他の実施例を示す側面図FIG. 7 is a side view showing another embodiment of the present invention.
【図８】図７に示す実施例の正面図FIG. 8 is a front view of the embodiment shown in FIG.
【図９】本発明の他の実施例を示す正面図FIG. 9 is a front view showing another embodiment of the present invention.
【図１０】図９に示す実施例の側面図FIG. 10 is a side view of the embodiment shown in FIG.
【図１１】本発明の他の実施例を示す正面図FIG. 11 is a front view showing another embodiment of the present invention.
【図１２】鋼板の磁束密度と磁界の強さの関係図FIG. 12 is a diagram showing the relationship between the magnetic flux density of the steel plate and the strength of the magnetic field.
【図１３】本発明の効果を模式的に示す説明図FIG. 13 is an explanatory diagram schematically showing the effect of the present invention.
【図１４】磁石により鋼板が磁気的に飽和することを確
認するためのシュミレ−ションにおける解析モデルを示
す説明図FIG. 14 is an explanatory diagram showing an analytical model in a simulation for confirming that a steel sheet is magnetically saturated by a magnet.
【図１５】図１４の解析で得られた磁界の分布を示す説
明図15 is an explanatory diagram showing the distribution of the magnetic field obtained by the analysis of FIG.
【図１６】高周波電流導通路によって鋼板に及ぼされる
磁気圧力を算定するためのシュミレ−ションにおける解
析モデルを示す説明図FIG. 16 is an explanatory diagram showing an analytical model in a simulation for calculating a magnetic pressure exerted on a steel sheet by a high frequency current conducting path.
【図１７】図１６の解析において、鋼板がセンタ位置に
ある場合の磁気圧力を示すグラフFIG. 17 is a graph showing the magnetic pressure when the steel sheet is at the center position in the analysis of FIG.
【図１８】図１６の解析において、鋼板がセンタ位置よ
り５ｍｍずれた場合の磁気圧力の分布を示すグラフFIG. 18 is a graph showing the distribution of magnetic pressure when the steel plate is displaced from the center position by 5 mm in the analysis of FIG.
【図１９】図１６の解析において、鋼板がセンタ位置よ
り１０ｍｍずれた場合の磁気圧力の分布を示すグラフFIG. 19 is a graph showing the distribution of magnetic pressure when the steel sheet is displaced 10 mm from the center position in the analysis of FIG. 16.
【図２０】従来の溶融めっきおよび目付方法を示す説明
図FIG. 20 is an explanatory view showing a conventional hot dip plating and basis weight method.
１…溶融めっき浴、２ａ、２ｂ…高周波電流導通路、３
…磁石1 ... Hot dip bath, 2a, 2b ... High frequency current conducting path, 3
…magnet
───────────────────────────────────────────────────── フロントページの続き (72)発明者 矢田 明 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Yada 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.
Claims (1)
めっき浴から引き出される鋼板の前面側および後面側
に、鋼板を挾んで略対向するようにして鋼板面に平行な
高周波電流導通路を鋼板面に近接して配置するととも
に、該高周波電流導通路近傍における鋼板幅方向の両側
外方に、鋼板幅方向を挾んで略対向するようにして磁石
のＮ極およびＳ極を配置し、該磁石により鋼板を磁気的
に十分飽和させた状態で、鋼板前面側および後面側の前
記高周波電流導通路に同位相の高周波電流を通電して鋼
板に逆位相の高周波電流を誘導させ、この誘導電流と前
記各高周波電流導通路の高周波電流との相互作用により
鋼板面に働く磁気圧力を発生させ、鋼板にその両面側か
ら作用する前記磁気圧力により、鋼板の幅方向での板反
りと振動を防止しつつ鋼板に付着した溶融金属をワイピ
ングし、鋼板のめっき目付を行うことを特徴とする溶融
めっき鋼板の目付方法。Claim: What is claimed is: 1. Above the bath surface of the hot dip plating bath, parallel to the front and rear surfaces of the steel plate drawn out from the hot dip bath so that the steel plates are sandwiched so as to substantially face each other and parallel to the steel plate surface. The high-frequency current conducting path is arranged close to the steel plate surface, and the N-pole and the S-pole of the magnet are arranged on both sides outward in the width direction of the steel sheet in the vicinity of the high-frequency current conducting path so as to face each other across the steel sheet width direction. Is placed and the steel plate is magnetically sufficiently saturated by the magnet, high-frequency currents of the same phase are applied to the high-frequency current conducting paths on the front and rear sides of the steel plate to induce a high-frequency current of opposite phase to the steel plate. Then, a magnetic pressure acting on the steel sheet surface is generated by the interaction between the induced current and the high-frequency current of each of the high-frequency current conducting paths, and the magnetic pressure acting on both sides of the steel sheet causes the plate in the width direction of the steel sheet. warp Basis weight method of hot dip plated steel sheet of the molten metal adhering to the steel sheet while preventing vibration wipes, and performing a plating weight of the steel sheet.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3180420A JP2601068B2 (en) | 1991-06-25 | 1991-06-25 | Hot-dip galvanized steel sheet |
| KR1019920011048A KR950000007B1 (en) | 1991-06-25 | 1992-06-24 | Method of controlling coating weight on a hot-dipping steel strip |
| CA002072210A CA2072210A1 (en) | 1991-06-25 | 1992-06-24 | Method for continuously moving a steel strip |
| CA002072200A CA2072200C (en) | 1991-06-25 | 1992-06-24 | Method for controlling coating weight on a hot-dipping steel strip |
| EP92110677A EP0525387B1 (en) | 1991-06-25 | 1992-06-25 | Method for controlling the coating weight on a hot-dip coated steel strip |
| DE69201466T DE69201466T2 (en) | 1991-06-25 | 1992-06-25 | Method for checking the coating weight of a hot-metallized steel strip. |
| US08/150,759 US5384166A (en) | 1991-06-25 | 1993-11-10 | Method for controlling coating weight on a hot-dipped steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3180420A JP2601068B2 (en) | 1991-06-25 | 1991-06-25 | Hot-dip galvanized steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH051360A true JPH051360A (en) | 1993-01-08 |
| JP2601068B2 JP2601068B2 (en) | 1997-04-16 |
Family
ID=16082952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3180420A Expired - Fee Related JP2601068B2 (en) | 1991-06-25 | 1991-06-25 | Hot-dip galvanized steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2601068B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004027315A (en) * | 2002-06-27 | 2004-01-29 | Jfe Steel Kk | Method and apparatus for manufacturing hot dip metal-coated steel plate |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62194757U (en) * | 1986-05-31 | 1987-12-11 |
-
1991
- 1991-06-25 JP JP3180420A patent/JP2601068B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62194757U (en) * | 1986-05-31 | 1987-12-11 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004027315A (en) * | 2002-06-27 | 2004-01-29 | Jfe Steel Kk | Method and apparatus for manufacturing hot dip metal-coated steel plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2601068B2 (en) | 1997-04-16 |
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