JP2016037663A - Method for measuring dross height within hot-dip galvanizing bath, method for producing hot-dip galvanized steel sheet, and device for measuring dross height within hot-dip galvanizing bath - Google Patents

Method for measuring dross height within hot-dip galvanizing bath, method for producing hot-dip galvanized steel sheet, and device for measuring dross height within hot-dip galvanizing bath Download PDF

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JP2016037663A
JP2016037663A JP2015016250A JP2015016250A JP2016037663A JP 2016037663 A JP2016037663 A JP 2016037663A JP 2015016250 A JP2015016250 A JP 2015016250A JP 2015016250 A JP2015016250 A JP 2015016250A JP 2016037663 A JP2016037663 A JP 2016037663A
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dross
galvanizing bath
dip galvanizing
hot dip
height
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JP6137211B2 (en
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紘司 藤田
Koji Fujita
紘司 藤田
小野　圭介
Keisuke Ono
圭介 小野
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JFE Steel Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a method for measuring a dross height within a hot-dip galvanizing bath, the method enabling the dross height within the hot-dip galvanizing bath to be estimated, and to provide a method for producing a hot-dip galvanized steel sheet, and a device for measuring the dross height within the hot-dip galvanizing bath.SOLUTION: In a hot-dip galvanized steel sheet production line, a temperature in a hot-dip galvanizing bath into which a steel sheet is passed so as to galvanize the surface of the steel sheet is measured, and on the basis of the measurement result, the deposition height of dross precipitated in the hot-dip galvanizing bath is estimated. On the basis of the estimation result, the galvanized steel sheet is produced while the generation of the dross and/or adhering of the dross to the steel sheet are suppressed.SELECTED DRAWING: Figure 2

Description

本発明は、溶融亜鉛めっき鋼板製造中に発生するドロスの高さ測定方法と装置、ならびに溶融亜鉛めっき鋼板の製造方法に関するものである。   The present invention relates to a method and an apparatus for measuring the height of dross generated during the production of a hot dip galvanized steel sheet, and a method for producing a hot dip galvanized steel sheet.

溶融金属めっき鋼板、特に、溶融亜鉛めっき鋼板は、建材、自動車、家電等の分野で広く使用されている。   Hot-dip metal-plated steel sheets, particularly hot-dip galvanized steel sheets, are widely used in fields such as building materials, automobiles, and home appliances.

溶融亜鉛めっき鋼板は、一般的には、溶融亜鉛めっき浴(以下、めっき浴、または、浴と称することもある)中に鋼板を浸漬して、めっき浴中を通過させることで製造される。   The hot dip galvanized steel sheet is generally produced by immersing a steel sheet in a hot dip galvanizing bath (hereinafter also referred to as a plating bath or a bath) and allowing the steel plate to pass through the plating bath.

図１は、従来の製造方法の概略図を示す。図１に示すように、従来の製造方法では、鋼板１００がスナウト１０１を介して溶融亜鉛で満たされているめっき浴槽１０２に送給され、めっき浴槽１０２内に設置されたシンクロール１０３を周回して通板され、めっき浴槽１０２内を上昇する。そして、鋼板１００は、浴中サポートロール１０４を経て、めっき浴槽１０２外に出て行く。このような製造工程において、めっき浴槽１０２では、鋼板１００から溶出したＦｅがＡｌ、Ｚｎと合金化することで、ＦｅＺｎ７やＦｅ２Ａｌ５を成分に含むドロスが発生する。ドロスの成分中、ＦｅＺｎ７は主にめっき浴槽１０２の底部にボトムドロス２００（以下、ドロスと称することもある）として堆積（沈殿）し、Ｆｅ２Ａｌ５等は、めっき浴表面に浮上しトップドロス２０１となる。 FIG. 1 shows a schematic view of a conventional manufacturing method. As shown in FIG. 1, in the conventional manufacturing method, a steel plate 100 is fed to a plating bath 102 filled with molten zinc through a snout 101 and circulates a sink roll 103 installed in the plating bath 102. Is passed through and rises in the plating bath 102. And the steel plate 100 goes out of the plating bath 102 through the support roll 104 in a bath. In such a manufacturing process, in the plating bath 102, Fe eluted from the steel plate 100 is alloyed with Al and Zn, so that dross containing FeZn 7 and Fe 2 Al 5 is generated. Among the dross components, FeZn 7 is deposited (precipitated) as bottom dross 200 (hereinafter sometimes referred to as dross) mainly at the bottom of the plating bath 102, and Fe 2 Al 5 etc. floats on the surface of the plating bath and is top dross. 201.

ボトムドロスの堆積高さが大きくなると、鋼板の浴侵入による随伴流により、ボトムドロスが巻上げられ鋼板に付着し、品質欠陥が発生する。   When the bottom dross height increases, the bottom dross is wound up and adheres to the steel sheet due to the accompanying flow caused by the penetration of the steel sheet into the bath, resulting in quality defects.

ボトムドロスの巻上げを防止するには、ボトムドロスを適正な高さに抑える必要がある。すなわち、めっき浴内でボトムドロスの堆積量が巻上げの起こらない許容高さを超えているか否かを判断する必要がある。これに対して、従来、ボトムドロスの堆積高さの測定は、オペレータが長い棒を溶融亜鉛めっき浴内に差し込むことで行っている。   In order to prevent the bottom dross from rolling up, it is necessary to keep the bottom dross at an appropriate height. That is, it is necessary to determine whether or not the amount of bottom dross deposited in the plating bath exceeds an allowable height at which no winding occurs. On the other hand, conventionally, the measurement of the bottom dross deposition height is performed by the operator inserting a long bar into the hot dip galvanizing bath.

また、特許文献１および２では、浴内の電気抵抗を測定し、その測定結果に基づいて、めっき浴内に沈殿する堆積物（ドロス）の堆積高さを測定する技術が開示されている。   Patent Documents 1 and 2 disclose a technique for measuring the electrical resistance in the bath and measuring the deposition height of the deposit (dross) precipitated in the plating bath based on the measurement result.

特開2008-231481号公報JP 2008-231481 A 特開2009-256739号公報JP 2009-256739

しかしながら、従来のオペレータによるボトムドロス堆積高さ測定は、長い棒を使用することから、オペレータの負担が大きい。また、溶融亜鉛めっき浴近辺の作業であることから、作業上安全の問題がある。また、高頻度で測定することは難しく、ボトムドロス高さの連続的な推移を知ることはできない。
特許文献１、２の方法では複数点での電気抵抗を測定する必要であり、設備コストがかかり、電気抵抗測定装置の寿命と安定性に問題がある。 However, the bottom dross accumulation height measurement by a conventional operator uses a long bar, so that the burden on the operator is large. Moreover, since it is the operation | work of the hot dip galvanizing bath vicinity, there exists a problem of work safety | security. Moreover, it is difficult to measure with high frequency, and it is impossible to know the continuous transition of the bottom dross height.
In the methods of Patent Documents 1 and 2, it is necessary to measure the electrical resistance at a plurality of points, which requires equipment costs, and there is a problem in the life and stability of the electrical resistance measuring device.

本発明は、かかる事情に鑑みてなされたものであって、溶融亜鉛めっき浴内のドロス高さが推定可能な溶融亜鉛めっき浴内のドロス高さ測定方法、溶融亜鉛めっき鋼板の製造方法ならびに溶融亜鉛めっき浴内のドロス高さ測定装置を提供することを目的とする。   The present invention has been made in view of such circumstances, and is a method for measuring the dross height in a hot dip galvanizing bath that can estimate the dross height in the hot dip galvanizing bath, a method for producing a hot dip galvanized steel sheet, and a hot melt. An object of the present invention is to provide a dross height measuring device in a galvanizing bath.

上記課題を解決するために検討した。その結果、溶融亜鉛めっき浴内の温度とボトムドロス中の温度に着目したところ、両者には温度差が生じていることがわかった。さらに検討を進めたところ、溶融亜鉛めっき浴内の温度よりもボトムドロス内の温度の方が低く、この溶融亜鉛めっき浴内の温度とボトムドロス中の温度の差を利用することで溶融亜鉛めっき浴内のドロス高さが推定可能となること知見した。   We studied to solve the above problems. As a result, when attention was paid to the temperature in the hot dip galvanizing bath and the temperature in the bottom dross, it was found that there was a temperature difference between the two. As a result of further investigation, the temperature in the bottom dross was lower than the temperature in the hot dip galvanizing bath. By utilizing the difference between the temperature in the hot dip galvanizing bath and the temperature in the bottom dross, It was found that the dross height can be estimated.

本発明は上記知見に基づくものであり、特徴は以下の通りである。
[１]溶融亜鉛めっき鋼板製造ラインにて、鋼板表面に亜鉛めっきを施すために前記鋼板が通板される溶融亜鉛めっき浴内の温度を測定し、その測定結果に基づいて、前記溶融亜鉛めっき浴内に沈殿するドロスの堆積高さを推定することを特徴とする溶融亜鉛めっき浴内のドロス高さ測定方法。
［２］前記溶融亜鉛めっき浴の深さ方向に深さが異なる複数箇所で前記温度を測定し、その測定結果に基づいて、前記ドロスの堆積高さを推定することを特徴とする前記［１］に記載の溶融亜鉛めっき浴内のドロス高さ測定方法。
［３］前記溶融亜鉛めっき浴の底部の複数箇所で前記温度を測定し、その測定結果に基づいて、前記ドロスの堆積高さを推定することを特徴とする前記［１］または［２］に記載の溶融亜鉛めっき浴内のドロス高さ測定方法。
［４］前記溶融亜鉛めっき浴内に設置されるシンクロールの下方で前記温度を測定し、その測定結果に基づいて、前記ドロスの堆積高さを推定することを特徴とする前記［１］〜［３］のいずれかに記載の溶融亜鉛めっき浴内のドロス高さ測定方法。
［５］鋼板を溶融亜鉛めっき浴に浸漬して溶融亜鉛めっき浴中を通過させることで、鋼板表面に亜鉛めっきを施し、溶融亜鉛めっき鋼板を製造する方法であり、前記［１］〜［４］のいずれかに記載の溶融亜鉛めっき浴内のドロス高さ測定方法による推定結果に基づいて、前記ドロスの発生および／または前記ドロスの鋼板への付着を抑制しながら、亜鉛めっき鋼板を製造することを特徴とする溶融亜鉛めっき鋼板の製造方法。
［６］鋼板を溶融亜鉛めっき浴に浸漬して溶融亜鉛めっき浴中を通過させることで、鋼板表面に亜鉛めっきを施し、溶融亜鉛めっき鋼板を製造する方法であり、前記［１］〜［４］のいずれかに記載の溶融亜鉛めっき浴内のドロス高さ測定方法による推定結果に基づいて、前記鋼板の通板速度を低下させること、前記溶融亜鉛めっき浴の温度を上昇させること、前記溶融亜鉛めっき浴の浴中サポートロールの押付量を増加させること、前記溶融亜鉛めっき浴への亜鉛インゴットの投入間隔時間を大きくすることの少なくとも一つを行うことで、前記ドロスの発生および／または前記ドロスの鋼板への付着を抑制することを特徴とする溶融亜鉛めっき鋼板の製造方法。
［７］溶融亜鉛めっき鋼板製造ラインにて、鋼板表面に亜鉛めっきを施すために前記鋼板が通板される溶融亜鉛めっき浴内に沈殿するドロスの堆積高さを測定する溶融亜鉛めっき浴内のドロス高さ測定装置であって、前記溶融亜鉛めっき浴内に設けられ、前記溶融亜鉛めっき浴の深さ方向に深さが異なる複数箇所で、溶融亜鉛めっき浴内の温度を測定する測定手段と、該測定手段による結果に基づいて、前記溶融亜鉛めっき浴内に沈殿するドロスの堆積高さを推定する推定手段を備えることを特徴とする溶融亜鉛めっき浴内のドロス高さ測定装置。
［８］溶融亜鉛めっき鋼板製造ラインにて、鋼板表面に亜鉛めっきを施すために前記鋼板が通板される溶融亜鉛めっき浴内に沈殿するドロスの堆積高さを測定する溶融亜鉛めっき浴内のドロス高さ測定装置であって、前記溶融亜鉛めっき浴の底部に複数設けられ、前記溶融亜鉛めっき浴の深さ方向に深さが異なる複数箇所で、溶融亜鉛めっき浴内の温度を測定する測定手段と、該測定手段による結果に基づいて、前記溶融亜鉛めっき浴内に沈殿するドロスの堆積高さを推定する推定手段を備えることを特徴とする溶融亜鉛めっき浴内のドロス高さ測定装置。
［９］前記測定手段は、前記溶融亜鉛めっき浴内に設置されるシンクロールの下部に備えられていることを特徴とする前記［８］に記載の溶融亜鉛めっき浴内のドロス高さ測定装置。 The present invention is based on the above findings, and features are as follows.
[1] In the hot dip galvanized steel sheet production line, the temperature in the hot dip galvanizing bath through which the steel sheet is passed in order to galvanize the steel sheet surface is measured, and the hot dip galvanizing is performed based on the measurement result. A method for measuring the height of dross in a hot dip galvanizing bath, wherein the height of dross deposited in the bath is estimated.
[2] The temperature is measured at a plurality of locations having different depths in the depth direction of the hot dip galvanizing bath, and the deposition height of the dross is estimated based on the measurement result. ] The dross height measuring method in the hot dip galvanizing bath described in the above.
[3] In the above [1] or [2], the temperature is measured at a plurality of locations at the bottom of the hot dip galvanizing bath, and the dross deposition height is estimated based on the measurement result The dross height measuring method in the hot dip galvanizing bath as described.
[4] The temperature is measured below a sink roll installed in the hot dip galvanizing bath, and the dross deposition height is estimated based on the measurement result. [3] The method for measuring the height of dross in the hot dip galvanizing bath according to any one of [3].
[5] A method for producing a hot-dip galvanized steel sheet by galvanizing the steel sheet surface by immersing the steel sheet in a hot-dip galvanizing bath and allowing the steel sheet to pass through the hot-dip galvanizing bath. [1] to [4] The galvanized steel sheet is manufactured while suppressing the generation of the dross and / or the adhesion of the dross to the steel sheet based on the estimation result by the method for measuring the dross height in the hot dip galvanizing bath according to any one of A method for producing a hot-dip galvanized steel sheet.
[6] A method for producing a hot-dip galvanized steel sheet by galvanizing the steel sheet surface by immersing the steel sheet in a hot-dip galvanizing bath and allowing the steel sheet to pass through the hot-dip galvanizing bath. ] Based on the estimation result by the dross height measuring method in the hot dip galvanizing bath according to any one of the above, lowering the sheet passing speed of the steel plate, raising the temperature of the hot dip galvanizing bath, By increasing at least one of increasing the pressing amount of the support roll in the galvanizing bath and increasing the interval time of introducing the zinc ingot to the hot dip galvanizing bath, the generation of the dross and / or the A method for producing a hot dip galvanized steel sheet, characterized by suppressing adhesion of dross to the steel sheet.
[7] In the hot dip galvanized steel sheet production line, in the hot dip galvanizing bath, the height of dross deposited in the hot dip galvanizing bath through which the steel sheet is passed in order to galvanize the steel sheet surface is measured. A dross height measuring device, provided in the hot dip galvanizing bath, and measuring means for measuring the temperature in the hot dip galvanizing bath at a plurality of locations having different depths in the depth direction of the hot dip galvanizing bath; An apparatus for measuring the height of dross in a hot dip galvanizing bath, comprising estimating means for estimating the height of dross deposited in the hot dip galvanizing bath based on the result of the measuring means.
[8] In a hot dip galvanized steel sheet production line, in the hot dip galvanizing bath, the height of dross deposited in the hot dip galvanizing bath through which the steel sheet is passed in order to galvanize the steel sheet surface is measured. A dross height measuring device, a plurality of which is provided at the bottom of the hot dip galvanizing bath, and measures the temperature in the hot dip galvanizing bath at a plurality of locations having different depths in the depth direction of the hot dip galvanizing bath. An apparatus for measuring a dross height in a hot dip galvanizing bath, comprising: a means for estimating the height of dross deposited in the hot dip galvanizing bath based on a result of the measuring means.
[9] The apparatus for measuring dross height in a hot dip galvanizing bath according to [8], wherein the measuring means is provided in a lower part of a sink roll installed in the hot dip galvanizing bath. .

なお、本発明において、溶融亜鉛めっき鋼板とは、溶融亜鉛めっき処理後合金化処理を施さないめっき鋼板（以下、ＧＩと称することもある）、合金化処理を施すめっき鋼板（以下、ＧＡと称することもある）のいずれも含むものである。   In the present invention, the hot dip galvanized steel sheet is a plated steel sheet (hereinafter also referred to as GI) that is not subjected to an alloying treatment after the hot dip galvanizing process, or a plated steel sheet (hereinafter referred to as GA) that is subjected to an alloying process. In some cases).

本発明によれば、簡単な構成で溶融亜鉛めっき浴内のドロス高さを推定できる。そして、その推定した高さに基づいて、ドロスの発生および／またはドロスの鋼板への付着を抑制しながら、溶融亜鉛めっき鋼板を製造することができる。   According to the present invention, the dross height in the hot dip galvanizing bath can be estimated with a simple configuration. And based on the estimated height, a hot dip galvanized steel sheet can be manufactured, suppressing generation | occurrence | production of dross and / or adhesion to the steel sheet of dross.

さらに、ドロス高さとして重要な指標である溶融亜鉛めっき浴内に設置されるシンクロール下方のドロス高さを測定することも可能であり、ドロスの発生および／またはドロスの鋼板への付着をより一層抑制することが可能となる。   Furthermore, it is also possible to measure the dross height below the sink roll installed in the hot dip galvanizing bath, which is an important index as dross height, and it is possible to prevent dross generation and / or adhesion of dross to the steel sheet. Further suppression is possible.

従来の溶融亜鉛めっき鋼板の製造方法の説明に用いた図である。It is the figure used for description of the manufacturing method of the conventional hot dip galvanized steel plate. 本発明のドロス高さ測定装置のめっき浴槽内における設置状態を示す図である。It is a figure which shows the installation state in the plating bathtub of the dross height measuring apparatus of this invention. 各温度測定点における温度を示す図である。It is a figure which shows the temperature in each temperature measurement point. 各温度測定点における温度を示す図である。It is a figure which shows the temperature in each temperature measurement point. 各温度測定点における温度を示す図である。It is a figure which shows the temperature in each temperature measurement point. 本発明のドロス高さ測定装置のめっき浴槽内に設置する前の状態を示す図である。It is a figure which shows the state before installing in the plating bathtub of the dross height measuring apparatus of this invention. 本発明のドロス高さ測定装置のめっき浴槽内における設置状態を示す正面図である。It is a front view which shows the installation state in the plating bathtub of the dross height measuring apparatus of this invention. 本発明のドロス高さ測定装置のめっき浴槽内における設置状態を示す平面図である。It is a top view which shows the installation state in the plating bathtub of the dross height measuring apparatus of this invention.

以下、図２を参照して本発明の実施の形態について説明する。   The embodiment of the present invention will be described below with reference to FIG.

図２は、ドロス高さ測定装置のめっき浴槽内における設置状態を示す図である。図２に示すように、鋼板１００がスナウト１０１を介して溶融亜鉛で満たされているめっき浴槽１０２に送給され、めっき浴槽１０２内に設置されたシンクロール１０３を周回して通板され、めっき浴槽１０２内を上昇し、鋼板１００は、浴中サポートロール１０４を経て、めっき浴槽１０２外に出て行くように構成されている。   FIG. 2 is a diagram illustrating an installation state of the dross height measuring apparatus in the plating bath. As shown in FIG. 2, a steel plate 100 is fed to a plating bath 102 filled with molten zinc via a snout 101, passed around a sink roll 103 installed in the plating bath 102, and plated. The inside of the bathtub 102 is raised, and the steel plate 100 is configured to go out of the plating bath 102 through the support roll 104 in the bath.

さらに、図２では、ドロス高さ測定装置１がめっき浴槽１０２内のめっき浴内に浸漬されている。このとき、ドロス高さ測定装置１は、５箇所の温度測定点２ａ、２ｂ、２ｃ、２ｄ、２ｅがめっき浴槽１０２の深さ方向に並ぶように備えられている。具体的には、図２に示すように、ボトムドロス２００内やドロス高さ上限値付近やボトムドロス２００が堆積して問題となる高さ付近等に温度測定点２ａ、２ｂ、２ｃ、２ｄ、２ｅが位置するように設置している。また、なお、ドロス高さ上限値とは、ボトムドロス２００の巻上げを制御可能なドロス高さの上限値である。   Further, in FIG. 2, the dross height measuring device 1 is immersed in the plating bath in the plating bath 102. At this time, the dross height measuring device 1 is provided such that five temperature measurement points 2 a, 2 b, 2 c, 2 d, and 2 e are arranged in the depth direction of the plating bath 102. Specifically, as shown in FIG. 2, the temperature measurement points 2a, 2b, 2c, 2d, and 2e are located in the bottom dross 200, near the upper limit of the dross height, near the height at which the bottom dross 200 is accumulated, and the like. It is installed so that it is located. In addition, the dross height upper limit value is an upper limit value of the dross height capable of controlling the winding of the bottom dross 200.

図２によれば、温度測定点２ａ、２ｂ、２ｃ、２ｄ、２ｅで溶融亜鉛めっき浴内の温度を測定する。そして、その測定した温度に基づいて、溶融亜鉛めっき浴内に沈殿するドロスの堆積高さを推定する。このとき、上述したように、各温度測定点での温度は、溶融亜鉛めっき浴中（２ｂ、２ｃ、２ｄ、２ｅ）の場合とボトムドロス２００内（２ａ）の場合では異なり、ボトムドロス２００内（２ａ）の方が低い値になる。これは、温度測定点２ａはボトムドロス２００内にあるため、浴流れが滞留し、浴内の温度に対し低下するためと考えられる。そして、この測定結果（温度）を基に、温度が低い値となった測定点はボトムドロス２００内と判定し、ボトムドロスの高さを推定できる。   According to FIG. 2, the temperature in the hot dip galvanizing bath is measured at temperature measuring points 2a, 2b, 2c, 2d and 2e. Based on the measured temperature, the height of dross deposited in the hot dip galvanizing bath is estimated. At this time, as described above, the temperature at each temperature measurement point is different between the case of the hot dip galvanizing bath (2b, 2c, 2d, 2e) and the case of the bottom dross 200 (2a). ) Is lower. This is considered because the temperature measurement point 2a is in the bottom dross 200, so that the bath flow stays and decreases with respect to the temperature in the bath. Based on the measurement result (temperature), the measurement point at which the temperature is low is determined to be in the bottom dross 200, and the height of the bottom dross can be estimated.

以上のようにして、溶融亜鉛めっき浴内の温度に基づいて、簡単な構成でボトムドロスの高さを測定できる。これにより、溶融亜鉛めっき鋼板製造ラインにおいて、ボトムドロスの堆積高さを常時監視でき、操業を妨げることなく、最適なタイミングでドロス除去作業を実施できる。   As described above, the height of the bottom dross can be measured with a simple configuration based on the temperature in the hot dip galvanizing bath. Thereby, in the hot dip galvanized steel sheet production line, the height of the bottom dross can be constantly monitored, and dross removal work can be performed at an optimal timing without hindering operation.

しかしながら、溶融亜鉛めっき浴内のドロス堆積の分布は、一様ではなく、製造サイクルや鋼板サイズの装入構成によって異なってくる場合がある。そのため、溶融亜鉛めっき浴内の一部のボトムドロスの高さを測定するだけでは、溶融亜鉛めっき浴全体のボトムドロスの堆積分布を知ることができない場合がある。検討したところ、溶融亜鉛めっき浴内の温度を測定する測定手段を溶融亜鉛めっき浴底部に複数設け、複数個所で、好ましくは溶融亜鉛めっき浴の深さ方向に深さが異なる複数箇所で溶融亜鉛めっき浴内の温度を測定することが有効であることがわかった。また、溶融亜鉛めっき浴内に設置されるシンクロール下方に堆積したボトムドロスは、鋼板との距離が近く巻上げられやすいため、シンクロール下方におけるボトムドロスの高さはボトムドロスの鋼板への付着抑制の指標として重要であることがわかった。   However, the distribution of dross deposits in the hot dip galvanizing bath is not uniform, and may vary depending on the manufacturing cycle and the charging configuration of the steel sheet size. Therefore, the bottom dross distribution distribution of the entire hot dip galvanizing bath may not be known only by measuring the height of a part of the bottom dross in the hot dip galvanizing bath. As a result of the investigation, a plurality of measuring means for measuring the temperature in the hot dip galvanizing bath are provided at the bottom of the hot dip galvanizing bath, and hot dip galvanized at a plurality of locations, preferably at different locations at different depths in the depth direction of the galvanized bath. It has been found effective to measure the temperature in the plating bath. Also, since the bottom dross deposited under the sink roll installed in the hot dip galvanizing bath is close to the steel plate and is easy to wind up, the height of the bottom dross under the sink roll is an index for suppressing the adhesion of the bottom dross to the steel plate. I found it important.

図６は、本発明の他の実施形態であり、溶融亜鉛めっき浴槽内に設置する前のドロス高さ測定装置を示す図である。図６は、ドロス高さ測定手段(温度計)３が格子状に複数組まれ架台４に設置する構成となっている。図７、８は、図６に示すドロス高さ測定装置１を溶融亜鉛めっき浴槽内に設置した図であり、図７は正面図、図８は平面図である。図７、８では、ドロス高さ測定装置１を、シンクロール１０３を溶融亜鉛めっき浴内に設置する前に、溶融亜鉛めっき浴中シンクロール１０３直下に設置し、ボトムドロス２００が巻上げられやすい溶融亜鉛めっき浴中のシンクロール１０３下方の複数個所で溶融亜鉛めっき浴内の温度が測定可能となるように設置している。さらに、ドロス高さ測定手段(温度計)３は、高さが溶融亜鉛めっき浴底部からシンクロール１０３下方までとなっており、溶融亜鉛めっき浴の深さ方向に深さが異なる複数箇所で溶融亜鉛めっき浴内の温度を測定することが可能となっている。また、測定温度が溶融亜鉛めっき浴外で観察可能となっている。また、ドロス高さ測定１を設置する毎にドロス高さ測定装置１の位置が同じとなるように、溶融亜鉛めっき浴の端には、架台４の大きさに合わせたガイド５を設置している。また、架台４は、溶融亜鉛めっき浴槽内にドロス高さ測定装置１を設置しやすくする点から、吊り環（図示せず）を設けることもできる。   FIG. 6 is a diagram showing a dross height measuring apparatus before installation in a hot dip galvanizing bath, which is another embodiment of the present invention. FIG. 6 shows a configuration in which a plurality of dross height measuring means (thermometers) 3 are assembled in a lattice shape and installed on the mount 4. 7 and 8 are views in which the dross height measuring apparatus 1 shown in FIG. 6 is installed in a hot dip galvanizing bath, FIG. 7 is a front view, and FIG. 8 is a plan view. 7 and 8, the dross height measuring device 1 is installed immediately below the sink roll 103 in the hot dip galvanizing bath before the sink roll 103 is placed in the hot dip galvanizing bath, and the hot dip zinc in which the bottom dross 200 is easily wound up. It is installed so that the temperature in the hot dip galvanizing bath can be measured at a plurality of locations below the sink roll 103 in the plating bath. Further, the dross height measuring means (thermometer) 3 has a height from the bottom of the hot dip galvanizing bath to the lower part of the sink roll 103, and melts at a plurality of locations having different depths in the depth direction of the hot dip galvanizing bath. It is possible to measure the temperature in the galvanizing bath. Further, the measurement temperature can be observed outside the hot dip galvanizing bath. In addition, a guide 5 corresponding to the size of the gantry 4 is installed at the end of the hot dip galvanizing bath so that the position of the dross height measuring device 1 becomes the same every time the dross height measurement 1 is installed. Yes. Moreover, the stand 4 can also provide a hanging ring (not shown) from the point which makes it easy to install the dross height measuring apparatus 1 in a hot dip galvanizing bath.

図６によれば、ドロス高さ測定手段(温度計)３により、溶融亜鉛めっき浴中のシンクロール１０３下方の複数個所で溶融亜鉛めっき浴内の温度を測定する。そして、その測定した温度に基づいて、溶融亜鉛めっき浴内に沈殿するドロスの高さを推定する。このとき、上述したように、各ドロス高さ測定手段(温度計)３での温度は、溶融亜鉛めっき浴中の場合とボトムドロス２００内の場合では異なり、ボトムドロス２００内の方が低い値になる。よって、この測定結果（温度）を基に、温度が低い値となった測定点はボトムドロス２００内と判定し、シンクロール下方におけるドロス堆積高さを推定する。また、複数個所（各測定点）のドロス堆積高さ推定結果を基に、ボトムドロスの高さ分布を推定する。その結果、溶融亜鉛めっき鋼板製造ラインにおいて、ボトムドロスの堆積高さを常時監視でき、操業を妨げることなく、最適なタイミングでドロス除去作業を実施できるのに加え、ドロスの発生および／またはドロスの鋼板への付着をより一層抑制することが可能となる。   According to FIG. 6, the temperature in the hot dip galvanizing bath is measured by a dross height measuring means (thermometer) 3 at a plurality of locations below the sink roll 103 in the hot dip galvanizing bath. Then, based on the measured temperature, the height of dross precipitated in the hot dip galvanizing bath is estimated. At this time, as described above, the temperature in each dross height measuring means (thermometer) 3 is different between the case in the hot dip galvanizing bath and the case in the bottom dross 200, and the value in the bottom dross 200 is lower. . Therefore, based on this measurement result (temperature), the measurement point at which the temperature is low is determined to be in the bottom dross 200, and the dross accumulation height below the sink roll is estimated. Moreover, the height distribution of the bottom dross is estimated based on the dross accumulation height estimation results at a plurality of locations (each measurement point). As a result, in the hot dip galvanized steel sheet production line, the height of bottom dross can be constantly monitored, dross removal work can be carried out at the optimal timing without interfering with operation, and dross generation and / or dross steel sheet can be performed. It is possible to further suppress adhesion to the surface.

さらに、上記溶融亜鉛めっき浴内のドロス高さ測定方法による推定結果に基づいて、ドロスの発生および／またはドロスの鋼板への付着を抑制しながら、亜鉛めっき鋼板を製造することができる。具体的には、例えば、ボトムドロス高さが許容量（堆積高さの上限値）を超えたと判断する場合は、鋼板の通板速度を低下させること、溶融亜鉛めっき浴の温度を上昇させること、溶融亜鉛めっき浴の浴中サポートロールの押付量を増加させること、溶融亜鉛めっき浴への亜鉛インゴットの投入間隔時間を大きくすることの少なくとも一つを行う。その結果、ドロスの発生および／またはドロスの鋼板への付着を抑制することができる。   Furthermore, a galvanized steel sheet can be manufactured, suppressing generation | occurrence | production of dross and / or adhesion to the steel sheet of dross based on the estimation result by the dross height measuring method in the said hot dip galvanizing bath. Specifically, for example, when it is determined that the bottom dross height has exceeded the allowable amount (upper limit value of the deposition height), reducing the sheet passing speed of the steel sheet, increasing the temperature of the hot dip galvanizing bath, At least one of increasing the pressing amount of the support roll in the hot dip galvanizing bath and increasing the time of charging the zinc ingot into the hot dip galvanizing bath is performed. As a result, generation of dross and / or adhesion of dross to the steel sheet can be suppressed.

以下、本発明を、実施例に基いて具体的に説明する。
図２に示すドロス高さ測定装置を用いて、ボトムドロス堆積高さ推定を行った例を示す。深さ方向に温度測定点を２ａ〜２ｅまで5点配置している。以下の３通りのボトムドロス堆積高さの場合について、それぞれの温度測定点で温度を測定した。 Hereinafter, the present invention will be specifically described based on examples.
The example which performed bottom dross accumulation height estimation using the dross height measuring apparatus shown in FIG. 2 is shown. Five temperature measurement points 2a to 2e are arranged in the depth direction. The temperature was measured at each temperature measurement point for the following three cases of bottom dross deposition height.

ボトムドロス堆積高さが温度測定点２ａより低い場合
各温度測定点における温度測定の結果を図３に示す。図３に示すように、各測定点における温度は460℃付近で一様である。 When the bottom dross accumulation height is lower than the temperature measurement point 2a, the result of the temperature measurement at each temperature measurement point is shown in FIG. As shown in FIG. 3, the temperature at each measurement point is uniform around 460 ° C.

ボトムドロス堆積高さが温度測定点２ａより高く、温度測定点２ｂより低い場合
各温度測定点における温度測定の結果を図４に示す。図４に示すように、温度測定点２ｂ、２ｃ、２ｄ、２ｅにおける温度は460℃付近で一様であるが、温度測定点２ａにおける温度は445℃付近と温度測定点２ｂ、２ｃ、２ｄ、２ｅにおける温度より低く乖離している。これは、温度測定点２ａはボトムドロス２００内にあるため、浴流れが滞留し、溶融亜鉛内の温度に対し低下するためである。 When the bottom dross deposition height is higher than the temperature measurement point 2a and lower than the temperature measurement point 2b, the result of the temperature measurement at each temperature measurement point is shown in FIG. As shown in FIG. 4, the temperature at the temperature measurement points 2b, 2c, 2d, and 2e is uniform around 460 ° C., but the temperature at the temperature measurement point 2a is around 445 ° C. and the temperature measurement points 2b, 2c, 2d, 2e is lower than the temperature in 2e. This is because the temperature measurement point 2a is in the bottom dross 200, so that the bath flow stays and decreases with respect to the temperature in the molten zinc.

ボトムドロス堆積高さが温度測定点２ｂより高く、温度測定点２ｃより低い場合
各温度測定点における温度測定の結果を図５に示す。図５に示すように、温度測定点２ｃ、２ｄ、２ｅにおける温度は460℃付近で一様であるが、温度測定点２ｂにおける温度は温度測定点２ｃ、２ｄ、２ｅにおける温度より低く、さらに温度測定点２ａにおける温度は温度測定点２ｃ、２ｄ、２ｅにおける温度より低くなっている。また、温度測定点２ａにおける温度は、２ｂにおける温度より低くなっている。これは、温度測定点２ａ、２ｂがボトムドロス２００内にあるためである。 When the bottom dross deposition height is higher than the temperature measurement point 2b and lower than the temperature measurement point 2c, the result of the temperature measurement at each temperature measurement point is shown in FIG. As shown in FIG. 5, the temperature at the temperature measurement points 2c, 2d, and 2e is uniform at around 460 ° C., but the temperature at the temperature measurement point 2b is lower than the temperature at the temperature measurement points 2c, 2d, and 2e. The temperature at the measurement point 2a is lower than the temperature at the temperature measurement points 2c, 2d, and 2e. The temperature at the temperature measurement point 2a is lower than the temperature at 2b. This is because the temperature measurement points 2 a and 2 b are in the bottom dross 200.

１ ドロス高さ測定装置
２ａ、２ｂ、２ｃ、２ｄ、２ｅ 温度測定点
３ ドロス高さ測定手段（温度計）
４ 架台
５ ガイド
１００ 鋼板
１０１ スナウト
１０２ めっき浴槽
１０３ シンクロール
１０４ サポートロール
２００ ボトムドロス
２０１ トップドロス 1 dross height measuring device 2a, 2b, 2c, 2d, 2e temperature measuring point 3 dross height measuring means (thermometer)
4 Stand 5 Guide 100 Steel Plate 101 Snout 102 Plating Bath 103 Sink Roll 104 Support Roll 200 Bottom Dross 201 Top Dross

Claims (9)

溶融亜鉛めっき鋼板製造ラインにて、鋼板表面に亜鉛めっきを施すために前記鋼板が通板される溶融亜鉛めっき浴内の温度を測定し、その測定結果に基づいて、前記溶融亜鉛めっき浴内に沈殿するドロスの堆積高さを推定することを特徴とする溶融亜鉛めっき浴内のドロス高さ測定方法。   In the hot dip galvanized steel sheet production line, the temperature in the hot dip galvanizing bath through which the steel sheet is passed in order to galvanize the steel sheet surface is measured, and based on the measurement results, A method for measuring the height of dross in a hot dip galvanizing bath, characterized by estimating the height of dross deposited. 前記溶融亜鉛めっき浴の深さ方向に深さが異なる複数箇所で前記温度を測定し、その測定結果に基づいて、前記ドロスの堆積高さを推定することを特徴とする請求項１に記載の溶融亜鉛めっき浴内のドロス高さ測定方法。   2. The deposition height of the dross is estimated according to claim 1, wherein the temperature is measured at a plurality of locations having different depths in the depth direction of the hot dip galvanizing bath, and the dross deposition height is estimated based on the measurement result. Method for measuring dross height in hot dip galvanizing bath. 前記溶融亜鉛めっき浴の底部の複数箇所で前記温度を測定し、その測定結果に基づいて、前記ドロスの堆積高さを推定することを特徴とする請求項１または２に記載の溶融亜鉛めっき浴内のドロス高さ測定方法。   3. The hot dip galvanizing bath according to claim 1, wherein the temperature is measured at a plurality of locations at the bottom of the hot dip galvanizing bath, and the dross deposition height is estimated based on the measurement result. Inside the dross height measurement method. 前記溶融亜鉛めっき浴内に設置されるシンクロールの下方で前記温度を測定し、その測定結果に基づいて、前記ドロスの堆積高さを推定することを特徴とする請求項１〜３のいずれか一項に記載の溶融亜鉛めっき浴内のドロス高さ測定方法。   The temperature is measured under a sink roll installed in the hot dip galvanizing bath, and the height of the dross is estimated based on the measurement result. The dross height measuring method in the hot dip galvanizing bath according to one item. 鋼板を溶融亜鉛めっき浴に浸漬して溶融亜鉛めっき浴中を通過させることで、鋼板表面に亜鉛めっきを施し、溶融亜鉛めっき鋼板を製造する方法であり、請求項１〜４のいずれか一項に記載の溶融亜鉛めっき浴内のドロス高さ測定方法による推定結果に基づいて、前記ドロスの発生および／または前記ドロスの鋼板への付着を抑制しながら、亜鉛めっき鋼板を製造することを特徴とする溶融亜鉛めっき鋼板の製造方法。   It is a method of manufacturing a hot-dip galvanized steel sheet by galvanizing the steel sheet surface by immersing the steel sheet in a hot-dip galvanizing bath and allowing the steel sheet to pass through the hot-dip galvanizing bath. A galvanized steel sheet is produced while suppressing the generation of the dross and / or adhesion of the dross to the steel sheet based on the estimation result by the dross height measurement method in the hot dip galvanizing bath described in 1. A method for producing a hot-dip galvanized steel sheet. 鋼板を溶融亜鉛めっき浴に浸漬して溶融亜鉛めっき浴中を通過させることで、鋼板表面に亜鉛めっきを施し、溶融亜鉛めっき鋼板を製造する方法であり、請求項１〜４のいずれか一項に記載の溶融亜鉛めっき浴内のドロス高さ測定方法による推定結果に基づいて、前記鋼板の通板速度を低下させること、前記溶融亜鉛めっき浴の温度を上昇させること、前記溶融亜鉛めっき浴の浴中サポートロールの押付量を増加させること、前記溶融亜鉛めっき浴への亜鉛インゴットの投入間隔時間を大きくすることの少なくとも一つを行うことで、前記ドロスの発生および／または前記ドロスの鋼板への付着を抑制することを特徴とする溶融亜鉛めっき鋼板の製造方法。   It is a method of manufacturing a hot-dip galvanized steel sheet by galvanizing the steel sheet surface by immersing the steel sheet in a hot-dip galvanizing bath and allowing the steel sheet to pass through the hot-dip galvanizing bath. On the basis of the estimation result by the dross height measuring method in the hot dip galvanizing bath described in the above, lowering the sheet passing speed of the steel plate, raising the temperature of the hot dip galvanizing bath, By performing at least one of increasing the pressing amount of the support roll in the bath and increasing the charging interval time of the zinc ingot into the hot dip galvanizing bath, the generation of the dross and / or the steel sheet of the dross A method for producing a hot dip galvanized steel sheet characterized by suppressing adhesion of steel. 溶融亜鉛めっき鋼板製造ラインにて、鋼板表面に亜鉛めっきを施すために前記鋼板が通板される溶融亜鉛めっき浴内に沈殿するドロスの堆積高さを測定する溶融亜鉛めっき浴内のドロス高さ測定装置であって、
前記溶融亜鉛めっき浴内に設けられ、
前記溶融亜鉛めっき浴の深さ方向に深さが異なる複数箇所で、溶融亜鉛めっき浴内の温度を測定する測定手段と、
該測定手段による結果に基づいて、前記溶融亜鉛めっき浴内に沈殿するドロスの堆積高さを推定する推定手段を備えることを特徴とする溶融亜鉛めっき浴内のドロス高さ測定装置。 In the hot dip galvanized steel sheet production line, the dross height in the hot dip galvanizing bath is used to measure the height of dross deposited in the hot dip galvanizing bath through which the steel plate is passed in order to galvanize the steel sheet surface. A measuring device,
Provided in the hot dip galvanizing bath,
Measuring means for measuring the temperature in the hot dip galvanizing bath at a plurality of locations with different depths in the depth direction of the hot dip galvanizing bath,
An apparatus for measuring the height of dross in a hot dip galvanizing bath, comprising estimating means for estimating the height of dross deposited in the hot dip galvanizing bath based on the result of the measuring means. 溶融亜鉛めっき鋼板製造ラインにて、鋼板表面に亜鉛めっきを施すために前記鋼板が通板される溶融亜鉛めっき浴内に沈殿するドロスの堆積高さを測定する溶融亜鉛めっき浴内のドロス高さ測定装置であって、
前記溶融亜鉛めっき浴の底部に複数設けられ、
前記溶融亜鉛めっき浴の深さ方向に深さが異なる複数箇所で、溶融亜鉛めっき浴内の温度を測定する測定手段と、
該測定手段による結果に基づいて、前記溶融亜鉛めっき浴内に沈殿するドロスの堆積高さを推定する推定手段を備えることを特徴とする溶融亜鉛めっき浴内のドロス高さ測定装置。 In the hot dip galvanized steel sheet production line, the dross height in the hot dip galvanizing bath is used to measure the height of dross deposited in the hot dip galvanizing bath through which the steel plate is passed in order to galvanize the steel sheet surface. A measuring device,
Provided at the bottom of the hot dip galvanizing bath,
Measuring means for measuring the temperature in the hot dip galvanizing bath at a plurality of locations with different depths in the depth direction of the hot dip galvanizing bath,
An apparatus for measuring the height of dross in a hot dip galvanizing bath, comprising estimating means for estimating the height of dross deposited in the hot dip galvanizing bath based on the result of the measuring means. 前記測定手段は、前記溶融亜鉛めっき浴内に設置されるシンクロールの下部に備えられていることを特徴とする請求項８に記載の溶融亜鉛めっき浴内のドロス高さ測定装置。   9. The dross height measuring device in a hot dip galvanizing bath according to claim 8, wherein the measuring means is provided in a lower part of a sink roll installed in the hot dip galvanizing bath.
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