JPH0578806A - Method for preventing vibration of galvanized steel strip - Google Patents
Method for preventing vibration of galvanized steel stripInfo
- Publication number
- JPH0578806A JPH0578806A JP24571891A JP24571891A JPH0578806A JP H0578806 A JPH0578806 A JP H0578806A JP 24571891 A JP24571891 A JP 24571891A JP 24571891 A JP24571891 A JP 24571891A JP H0578806 A JPH0578806 A JP H0578806A
- Authority
- JP
- Japan
- Prior art keywords
- hot
- galvanized steel
- steel strip
- dip galvanized
- vibration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Coating With Molten Metal (AREA)
Abstract
(57)【要約】
【目的】 溶融亜鉛めっき槽から合金化炉を通ってトッ
プロールに達するまでに発生する、溶融亜鉛めっき鋼帯
の振動を防止する。
【構成】 溶融亜鉛めっき鋼帯の両面にスリットノズル
により圧縮空気を吹き付けて、溶融亜鉛めっき槽のシン
クロールからトップロールまでの間を通過する溶融亜鉛
めっき鋼帯の振動を防止する溶融亜鉛めっき鋼帯の振動
防止方法において、両側から吹き付ける圧縮空気に圧力
差を設けたことを特徴とする溶融亜鉛めっき鋼帯の振動
防止方法。
(57) [Summary] [Purpose] To prevent vibration of hot-dip galvanized steel strip that occurs from the hot-dip galvanizing tank through the alloying furnace to the top roll. [Composition] Hot-dip galvanized steel that prevents vibration of hot-dip galvanized steel strip that passes between the sink roll and top roll of hot-dip galvanizing tank by blowing compressed air to both sides of hot-dip galvanized steel strip. A method for preventing vibration of a hot-dip galvanized steel strip, wherein a pressure difference is provided to the compressed air blown from both sides.
Description
【０００１】[0001]
【産業上の利用分野】この発明は、溶融亜鉛めっき鋼帯
を加熱して合金化溶融亜鉛めっき鋼帯を製造するに際し
ての溶融亜鉛めっき鋼帯の振動防止方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing vibration of a hot-dip galvanized steel strip when heating the hot-dip galvanized steel strip to produce an alloyed hot-dip galvanized steel strip.
【０００２】[0002]
【従来の技術】合金化溶融亜鉛めっき鋼帯は、溶融亜鉛
めっきしたままの溶融亜鉛めっき鋼帯に比較して、塗装
性および溶接性に優れているため、高度な耐食性が要求
されかつ高い溶接作業性が要求される自動車用鋼板等に
使用される。2. Description of the Related Art Alloyed hot-dip galvanized steel strips are required to have a high degree of corrosion resistance and high weldability because they are superior in paintability and weldability as compared to hot-dip galvanized steel strips that have been hot-dip galvanized. It is used for steel sheets for automobiles, etc. that require workability.
【０００３】上述した合金化溶融亜鉛めっき鋼帯は、図
５に示す工程により製造される。すなわち、溶融亜鉛２
１を満たした溶融亜鉛めっき槽２２に浸漬された鋼帯２
３は、シンクロール２４により進行方向が変えられ垂直
上方に引き上げられる。鋼帯２３の表裏面に付着する亜
鉛の付着量は、溶融亜鉛めっき槽２２からの引き上げ速
度におよそ比例して多くなるので、一般的には過剰な亜
鉛が付着しがちであり、この過剰な亜鉛は、溶融亜鉛め
っき槽２２の上方に設けたワイピングノズル２５によ
り、空気、窒素ガス等の高圧ガスを吹き付けて、絞り取
るようにしている。The alloyed hot-dip galvanized steel strip described above is manufactured by the process shown in FIG. That is, molten zinc 2
Steel strip 2 dipped in hot dip galvanizing tank 22 filled with 1
The moving direction of No. 3 is changed by the sink roll 24 and pulled up vertically upward. The amount of zinc adhered to the front and back surfaces of the steel strip 23 increases in proportion to the pulling rate from the hot dip galvanizing tank 22, so that excessive zinc tends to adhere, and this excessive amount of zinc tends to adhere. Zinc is squeezed by blowing a high-pressure gas such as air or nitrogen gas with a wiping nozzle 25 provided above the hot dip galvanizing bath 22.
【０００４】このようにして所定の付着量の亜鉛が付着
した溶融亜鉛めっき鋼帯２６は、タッチロール２７を通
り、垂直に合金化炉２８に導き入れられ、５００〜６０
０℃程度に加熱される。さらに、合金化炉２８出口上方
に設けられた保熱帯２９で一定時間一定温度に保持され
た後、保熱帯２９上方に設けられた冷却帯３０で冷却さ
れ、合金化溶融亜鉛めっき鋼帯３１になるとともに、冷
却帯３０上方に配置したトップロール３２により進行方
向を垂直方向から水平方向に変更され、次の工程に入っ
て行く。The hot-dip galvanized steel strip 26 to which a predetermined amount of zinc has been attached in this manner passes through the touch roll 27 and is vertically introduced into the alloying furnace 28, where it is 500-60.
It is heated to about 0 ° C. Further, after being kept at a constant temperature for a certain period of time by a heat retaining zone 29 provided above the outlet of the alloying furnace 28, it is cooled by a cooling zone 30 provided above the heat retaining zone 29 to form an alloyed hot dip galvanized steel strip 31. At the same time, the traveling direction is changed from the vertical direction to the horizontal direction by the top roll 32 arranged above the cooling zone 30, and the next step is started.
【０００５】上述した合金化溶融亜鉛めっき鋼帯の製造
工程においては、シンクロール２４とトップロール３２
間で、溶融亜鉛めっき鋼帯２６および合金化溶融亜鉛め
っき鋼帯３１に張力が付与されているとはいえ、最近の
高速ラインにおいてはシンクロール２４とトップロール
３２間の距離が４０ｍ以上にもなるので、溶融亜鉛めっ
き鋼帯２６および合金化溶融亜鉛めっき鋼帯３１が板厚
の方向に振動し、めっきの付着量がばらつくという問題
がある。In the manufacturing process of the above-mentioned galvannealed steel strip, the sink roll 24 and the top roll 32 are used.
Although the tension is applied to the hot-dip galvanized steel strip 26 and the alloyed hot-dip galvanized steel strip 31, the distance between the sink roll 24 and the top roll 32 is 40 m or more in the recent high-speed line. Therefore, there is a problem that the hot-dip galvanized steel strip 26 and the alloyed hot-dip galvanized steel strip 31 vibrate in the plate thickness direction, and the amount of coating adhered varies.
【０００６】このような振動を防止する技術としては、
「溶融亜鉛めっき鋼板製造技術の進歩」（第１０６回、
第１０７回西山記念講座、ｐ９）記載されているような
静圧パッドがある。この静圧パッドは、図６に示すよう
に、冷却帯３０を通過中の溶融亜鉛めっき鋼帯２６の両
側に設けた１対の圧縮空気吹付装置４１の圧縮空気供給
室４２から、スリットノズル４３を通して圧縮空気を溶
融亜鉛めっき鋼帯２６の両表面に吹き付けて、溶融亜鉛
めっき鋼帯２６の表面に静圧領域４４を生成させたもの
である。そして、この静圧領域４４のダンパー効果を利
用して、溶融亜鉛めっき鋼帯２６が振動によりいずれか
の静圧領域４４にずれようとしても、すばやくもとの位
置に押し戻してやるのである。A technique for preventing such vibration is as follows:
"Advances in hot-dip galvanized steel sheet manufacturing technology" (106th
There is a static pressure pad as described in the 107th Nishiyama Memorial Lecture, p9). As shown in FIG. 6, the static pressure pad includes a slit nozzle 43 and a compressed air supply chamber 42 of a pair of compressed air blowing devices 41 provided on both sides of the hot dip galvanized steel strip 26 passing through the cooling zone 30. Compressed air is blown onto both surfaces of the hot-dip galvanized steel strip 26 to generate static pressure regions 44 on the surface of the hot-dip galvanized steel strip 26. Then, by utilizing the damper effect of the static pressure region 44, even if the hot dip galvanized steel strip 26 shifts to one of the static pressure regions 44 due to vibration, it is quickly pushed back to its original position.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、上述し
たような従来の溶融亜鉛めっき鋼帯の振動を防止する方
法においては、両側の静圧領域の静圧が等しくなるよう
に設定するようにしているので、静圧パッドに圧縮空気
を送るブロワに圧力の変動があると、この影響を受けて
両側の静圧領域の静圧のバランスが崩れやすく、したが
ってこのような状態になると、振動が発生するという問
題点があった。However, in the conventional method for preventing vibration of the hot-dip galvanized steel strip as described above, the static pressures in the static pressure regions on both sides are set to be equal. Therefore, if there is a pressure fluctuation in the blower that sends compressed air to the static pressure pad, the static pressure balance in the static pressure regions on both sides is easily affected by this effect, and in such a state, vibration will occur. There was a problem.
【０００８】この発明は、従来技術の上述のような問題
点を解消し、圧縮空気を送るブロワに圧力の変動があっ
ても、溶融亜鉛めっき鋼帯に振動が発生しない溶融亜鉛
めっき鋼帯の振動防止方法を提供することを目的として
いる。The present invention solves the above-mentioned problems of the prior art, and does not cause vibration in the hot-dip galvanized steel strip even if the blower for sending compressed air changes in pressure. It is intended to provide a vibration prevention method.
【０００９】[0009]
【課題を解決するための手段】この発明に係る溶融亜鉛
めっき鋼帯の振動防止方法は、溶融亜鉛めっき鋼帯の両
面にスリットノズルにより圧縮空気を吹き付けて、溶融
亜鉛めっき槽のシンクロールからトップロールまでの間
を通過する溶融亜鉛めっき鋼帯の振動を防止する溶融亜
鉛めっき鋼帯の振動防止方法において、両側から吹き付
ける圧縮空気に圧力差を設けたものである。A method for preventing vibration of a hot-dip galvanized steel strip according to the present invention is to blow compressed air onto both sides of a hot-dip galvanized steel strip with a slit nozzle so that the top of a sink roll of a hot-dip galvanizing tank is removed. In a method for preventing vibration of a hot-dip galvanized steel strip that passes between rolls, the compressed air blown from both sides is provided with a pressure difference.
【００１０】[0010]
【作用】この発明に係る溶融亜鉛めっき鋼帯の振動防止
方法は、溶融亜鉛めっき鋼帯の両面にスリットノズルに
より圧縮空気を吹き付けて、溶融亜鉛めっき槽のシンク
ロールからトップロールまでの間を通過する溶融亜鉛め
っき鋼帯の振動を防止する溶融亜鉛めっき鋼帯の振動防
止方法において、両側から吹き付ける圧縮空気に圧力差
を設けている。したがって、圧縮空気を送るブロワに圧
力の変動があっても、この圧力変動を上回る圧力差を両
側の圧縮空気につけておけば、溶融亜鉛めっき鋼帯が振
動することはない。The vibration preventing method for the hot-dip galvanized steel strip according to the present invention is such that compressed air is blown to both sides of the hot-dip galvanized steel strip by a slit nozzle to pass the hot-dip galvanized bath from the sink roll to the top roll. In the method of preventing vibration of a hot-dip galvanized steel strip for preventing vibration of the hot-dip galvanized steel strip, a pressure difference is provided to the compressed air blown from both sides. Therefore, even if there is a pressure fluctuation in the blower that sends compressed air, the hot-dip galvanized steel strip will not vibrate if a pressure difference that exceeds this pressure fluctuation is applied to the compressed air on both sides.
【００１１】[0011]
【実施例】本発明の１実施例の溶融亜鉛めっき鋼帯の振
動防止方法を、図１〜図３により説明する。本発明の１
実施例の溶融亜鉛めっき鋼帯の振動防止方法は、図１に
示すように、垂直に上昇する溶融亜鉛めっき鋼帯２６の
両側に吹き付け方向が上下方向の中心を向くように設け
られた上下２本のスリットノズル１を有する１対の静圧
パッド２を、図２に示す冷却帯３０の冷却ノズル３の間
に複数対設けている。図３は上述した複数対の冷却パッ
ド２の相対する冷却パッド２ａおよび２ｂに、圧力差を
設けて圧縮空気を送るための配管系統図を示すものであ
る。トップロール３２直下の冷却帯に、Ａ〜Ｄで示す静
圧パッド４対を溶融亜鉛めっき鋼帯２６を挟んで配置し
ているケースであり、ブロワ４により送り出された圧縮
空気は、ダンパ５を通ったものは溶融亜鉛めっき鋼帯２
６の表側（符号Ｓ）の静圧パッド２ａに供給され、ダン
パ６を通ったものは溶融亜鉛めっき鋼帯２６の裏側（符
号Ｒ）の静圧パッド２ｂに供給されるようになってい
る。EXAMPLE A vibration preventing method for hot-dip galvanized steel strip according to an example of the present invention will be described with reference to FIGS. 1 of the present invention
As shown in FIG. 1, a method for preventing vibration of a hot-dip galvanized steel strip according to the embodiment is a method in which a vertical direction is provided on both sides of a hot-dip galvanized steel strip 26 so that the spraying direction is directed to the vertical center. A plurality of pairs of static pressure pads 2 having one slit nozzle 1 are provided between the cooling nozzles 3 of the cooling zone 30 shown in FIG. FIG. 3 is a piping system diagram for sending compressed air by providing a pressure difference between the cooling pads 2a and 2b facing each other of the plurality of pairs of cooling pads 2 described above. In the cooling zone just below the top roll 32, 4 pairs of static pressure pads A to D are arranged sandwiching the hot dip galvanized steel strip 26, and the compressed air sent out by the blower 4 passes through the damper 5. What passed is hot-dip galvanized steel strip 2
6 is supplied to the static pressure pad 2a on the front side (symbol S), and the material passing through the damper 6 is supplied to the static pressure pad 2b on the back side (symbol R) of the hot-dip galvanized steel strip 26.
【００１２】上述のように配置された静圧パッドに、ダ
ンパ５および６の開度を変化させて裏表に種々の圧力差
を与えた圧縮空気を供給するとともに、静圧パッドの溶
融亜鉛めっき鋼帯２６からの距離を種々変えたときの、
溶融亜鉛めっき鋼帯２６の振動の振幅の大きさと、振幅
の中心と本来のパスラインの中心とのズレ量とを測定
し、どのように圧力差を設けたときが振動を防止できる
かを評価した。The static pressure pad arranged as described above is supplied with compressed air having various pressure differences between the front and back by changing the opening degrees of the dampers 5 and 6, and the hot dip galvanized steel of the static pressure pad is supplied. When the distance from the belt 26 is changed,
The magnitude of vibration of the hot-dip galvanized steel strip 26 and the amount of deviation between the center of the amplitude and the center of the original pass line are measured to evaluate how a pressure difference can prevent vibration. did.
【００１３】このときの操業条件、測定条件は次のとお
りである。 （１）ブロワ能力 １）風 量 ３０，０００Ｎｍ3／Ｈｒ ２）吐出圧 ４００ｍｍＨ2Ｏ （２）静圧パッド形状 図４に示すように、スリットギャップ（Ｇ）２５ｍｍ、
スリット幅（Ｗ）２，０００ｍｍ、スリット本数２本、
スリット間隔（Ｌ）２００ｍｍ （３）静圧パッドＡ，Ｂ，Ｃ，Ｄ各間の距離 ５ｍ （４）振動測定位置 静圧パッドＢとＣの中間点 （５）測定方法 レーザー式距離センサーThe operating conditions and measuring conditions at this time are as follows. (1) Blower capacity 1) Air volume 30,000 Nm 3 / Hr 2) Discharge pressure 400 mmH 2 O (2) Static pressure pad shape As shown in FIG. 4, slit gap (G) 25 mm,
Slit width (W) 2,000 mm, 2 slits,
Slit interval (L) 200 mm (3) Distance between static pressure pads A, B, C, D 5 m (4) Vibration measurement position Intermediate point between static pressure pads B and C (5) Measuring method Laser distance sensor
【００１４】静圧パッド位置、ダンパー開度と、振幅お
よび振幅の中心と本来のパスラインの中心とのズレの関
係を表１に示す。表中評価の項の×は設定不良、〇はや
や良、◎は設定良好を示す。また、ズレの＋は表側への
ズレ、−は裏側へのズレを表す。Table 1 shows the relationship between the static pressure pad position, the damper opening, the amplitude, and the deviation between the center of the amplitude and the original center of the pass line. In the evaluation items in the table, x indicates a poor setting, ◯ indicates a little good, and ◎ indicates a good setting. In addition, + indicates the deviation to the front side, and − indicates the deviation to the back side.
【００１５】[0015]
【表１】 [Table 1]
【００１６】表１から明らかなように、静圧パッドの溶
融亜鉛めっき鋼帯からの距離、対向する静圧パッド間の
圧力差を適正に選択すれば、溶融亜鉛めっき鋼帯の振動
を小さく抑えることができることが分かる。なお、実施
例では静圧パッドを使用する例で説明したが、圧力差の
ある動圧を使用してもよい。As is apparent from Table 1, if the distance of the hydrostatic pad from the hot-dip galvanized steel strip and the pressure difference between the opposing hydrostatic pads are properly selected, the vibration of the hot-dip galvanized steel strip can be suppressed to a small level. You can see that you can. In addition, although the example in which the static pressure pad is used has been described in the embodiment, a dynamic pressure having a pressure difference may be used.
【００１７】[0017]
【発明の効果】この発明により、溶融亜鉛めっき槽のシ
ンクロールからトップロール間を通過中の溶融亜鉛めっ
き鋼帯の振動を抑えることができる。According to the present invention, vibration of the hot-dip galvanized steel strip during passage between the sink roll and the top roll of the hot-dip galvanizing tank can be suppressed.
【図１】本発明の１実施例の溶融亜鉛めっき鋼帯の振動
防止方法に使用する静圧パッドの説明図である。FIG. 1 is an explanatory view of a static pressure pad used in a method for preventing vibration of a hot-dip galvanized steel strip according to an embodiment of the present invention.
【図２】静圧パッドの配置位置を示す説明図である。FIG. 2 is an explanatory diagram showing a layout position of a static pressure pad.
【図３】本発明の１実施例の溶融亜鉛めっき鋼帯の振動
防止方法に使用する静圧パッドの配管系統図である。FIG. 3 is a piping system diagram of a static pressure pad used in a method for preventing vibration of a hot-dip galvanized steel strip according to an embodiment of the present invention.
【図４】静圧パッドの寸法諸元を示す説明図である。FIG. 4 is an explanatory diagram showing dimensions of a static pressure pad.
【図５】合金化溶融亜鉛めっき鋼帯の製造工程を示す工
程図である。FIG. 5 is a process drawing showing a process for manufacturing an alloyed hot-dip galvanized steel strip.
【図６】従来の静圧パッドを示す説明図である。FIG. 6 is an explanatory view showing a conventional static pressure pad.
１ スリットノズル ２ 静圧パッド ３ 冷却ノズル ４ ブロワ ５ ダンパ ６ ダンパ 1 Slit nozzle 2 Static pressure pad 3 Cooling nozzle 4 Blower 5 Damper 6 Damper
Claims (1)
ズルにより圧縮空気を吹き付けて、溶融亜鉛めっき槽の
シンクロールからトップロールまでの間を通過する溶融
亜鉛めっき鋼帯の振動を防止する溶融亜鉛めっき鋼帯の
振動防止方法において、両側から吹き付ける圧縮空気に
圧力差を設けたことを特徴とする溶融亜鉛めっき鋼帯の
振動防止方法。1. A hot-dip galvanized steel strip which is blown with compressed air on both sides of a hot-dip galvanized steel strip to prevent vibration of the hot-dip galvanized steel strip passing between the sink roll and the top roll of the hot-dip galvanizing tank. A method for preventing vibration of a galvanized steel strip, characterized in that a pressure difference is provided to compressed air blown from both sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3245718A JP2605521B2 (en) | 1991-09-25 | 1991-09-25 | Vibration prevention method for hot-dip galvanized steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3245718A JP2605521B2 (en) | 1991-09-25 | 1991-09-25 | Vibration prevention method for hot-dip galvanized steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0578806A true JPH0578806A (en) | 1993-03-30 |
| JP2605521B2 JP2605521B2 (en) | 1997-04-30 |
Family
ID=17137771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3245718A Expired - Fee Related JP2605521B2 (en) | 1991-09-25 | 1991-09-25 | Vibration prevention method for hot-dip galvanized steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2605521B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002266060A (en) * | 2001-03-07 | 2002-09-18 | Nippon Steel Corp | Vertical alloying furnace and its operation method |
| KR100669834B1 (en) * | 1999-07-06 | 2007-01-18 | 스탕 위르떼 | Strip vibration elimination method and removal device in the gas blowing area, especially in the cooling area |
| KR100802040B1 (en) * | 2001-08-27 | 2008-02-12 | 재단법인 포항산업과학연구원 | Strip vibration suppressor |
| WO2014003270A1 (en) * | 2012-06-25 | 2014-01-03 | 주식회사 포스코 | Apparatus for maintaining strip flatness |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5779164A (en) * | 1980-10-06 | 1982-05-18 | Nippon Steel Corp | Polygonal nozzle type fluid pressure pad |
-
1991
- 1991-09-25 JP JP3245718A patent/JP2605521B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5779164A (en) * | 1980-10-06 | 1982-05-18 | Nippon Steel Corp | Polygonal nozzle type fluid pressure pad |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100669834B1 (en) * | 1999-07-06 | 2007-01-18 | 스탕 위르떼 | Strip vibration elimination method and removal device in the gas blowing area, especially in the cooling area |
| JP2002266060A (en) * | 2001-03-07 | 2002-09-18 | Nippon Steel Corp | Vertical alloying furnace and its operation method |
| KR100802040B1 (en) * | 2001-08-27 | 2008-02-12 | 재단법인 포항산업과학연구원 | Strip vibration suppressor |
| WO2014003270A1 (en) * | 2012-06-25 | 2014-01-03 | 주식회사 포스코 | Apparatus for maintaining strip flatness |
| KR101374348B1 (en) * | 2012-06-25 | 2014-03-14 | 주식회사 포스코 | Apparatus for keeping flatness of strip |
| CN104379793A (en) * | 2012-06-25 | 2015-02-25 | Posco公司 | Apparatus for maintaining strip flatness |
| JP2015522714A (en) * | 2012-06-25 | 2015-08-06 | ポスコ | Strip flatness maintenance device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2605521B2 (en) | 1997-04-30 |
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