JP6911474B2 - Edge mask shielding plate and hot-dip zinc scattering prevention method at the wiping nozzle of the hot-dip galvanizing line - Google Patents
Edge mask shielding plate and hot-dip zinc scattering prevention method at the wiping nozzle of the hot-dip galvanizing line Download PDFInfo
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本発明は、溶融亜鉛めっきラインのワイピングノズル部におけるエッジマスク遮蔽板及び溶融亜鉛飛散防止方法に関するものである。 The present invention relates to an edge mask shielding plate and a method for preventing molten zinc scattering in a wiping nozzle portion of a hot-dip galvanizing line.
溶融亜鉛めっき鋼板製造ラインでは防錆を目的として、鋼板にZnを一定量付着させている。このZn付着量は鋼板表裏面に設置したワイピングダイスと呼ばれる装置からガスを吐出して鋼板に衝突させ、鋼板衝突圧力を調整することで制御している。一方、溶融亜鉛めっき鋼板の生産性を向上するためにラインスピードを増速することが求められる。この時、鋼板表面のZn付着量を一定にし続けるために、鋼板衝突圧力も上げる。しかし、鋼板衝突圧力を上げると、鋼板エッジ部においてワイピングダイスから吐出されたガス同士の衝突力も大きくなり、ガス乱れを助長させる。ガス乱れが大きくなると、鋼板エッジ部で発生するZn飛沫(以下：飛散亜鉛)も大きくなる。この飛散亜鉛が鋼板に付着すると品質欠陥が発生する。 In the hot-dip galvanized steel sheet production line, a certain amount of Zn is attached to the steel sheet for the purpose of rust prevention. This amount of Zn adhesion is controlled by discharging gas from a device called a wiping die installed on the front and back surfaces of the steel sheet to cause it to collide with the steel sheet and adjusting the steel sheet collision pressure. On the other hand, it is required to increase the line speed in order to improve the productivity of the hot-dip galvanized steel sheet. At this time, the collision pressure of the steel sheet is also increased in order to keep the amount of Zn adhered to the surface of the steel sheet constant. However, when the steel plate collision pressure is increased, the collision force between the gases discharged from the wiping dies at the steel plate edge portion also increases, which promotes gas turbulence. As the gas turbulence increases, the Zn droplets (hereinafter referred to as scattered zinc) generated at the edges of the steel sheet also increase. When this scattered zinc adheres to the steel sheet, quality defects occur.
これに対して、特許文献１に記載されているように、めっき浴を通過した鋼板の側方にエッジマスク遮蔽板を設置することが知られている。このエッジマスク遮蔽板は鋼板エッジ部でのガス乱れを緩和することができる。 On the other hand, as described in Patent Document 1, it is known that an edge mask shielding plate is installed on the side of the steel plate that has passed through the plating bath. This edge mask shielding plate can alleviate gas turbulence at the edge of the steel sheet.
ところで、従来のエッジマスク遮蔽板では、鋼板衝突圧力を上げても品質欠陥を発生させるような大きな飛散亜鉛の発生は抑制できるものの、飛散亜鉛を完全には抑制できない。そのため、エッジマスク遮蔽板に飛散亜鉛が付着してしまう。エッジマスク遮蔽板に飛散亜鉛が付着し続け、成長して亜鉛塊になると鋼板に接触して品質欠陥が発生する。このため、エッジマスク遮蔽板の清掃は必須となっている。また、清掃治具が鋼板に接触すると品質欠陥が発生するため、清掃時はエッジマスク遮蔽板を鋼板エッジ部から離す必要がある。この時、エッジマスク遮蔽板による鋼板エッジ部のガス乱れ緩和効果が失われ、品質欠陥を発生させるような大きな飛散亜鉛が発生する。そのため、エッジマスク遮蔽板の清掃時にはエッジマスク遮蔽板を鋼板エッジ部から離しても大きな飛散亜鉛が発生しないラインスピードまで減速する必要があり、生産性が著しく低下する。以上のようにエッジマスク遮蔽板への飛散亜鉛付着は、生産性を著しく低下させる要因であり、飛散亜鉛付着を防止可能なエッジマスク遮蔽板の発明が望まれていた。 By the way, in the conventional edge mask shielding plate, although the generation of large scattered zinc that causes quality defects can be suppressed even if the collision pressure of the steel sheet is increased, the scattered zinc cannot be completely suppressed. Therefore, scattered zinc adheres to the edge mask shielding plate. Scattered zinc continues to adhere to the edge mask shielding plate, and when it grows into zinc lumps, it comes into contact with the steel plate and quality defects occur. Therefore, cleaning of the edge mask shielding plate is indispensable. Further, when the cleaning jig comes into contact with the steel plate, quality defects occur, so that it is necessary to separate the edge mask shielding plate from the steel plate edge portion during cleaning. At this time, the effect of mitigating gas turbulence at the edge of the steel sheet by the edge mask shielding plate is lost, and large scattered zinc that causes quality defects is generated. Therefore, when cleaning the edge mask shielding plate, it is necessary to reduce the speed to a line speed at which a large amount of scattered zinc is not generated even if the edge mask shielding plate is separated from the edge portion of the steel sheet, and the productivity is significantly reduced. As described above, the adhesion of scattered zinc to the edge mask shielding plate is a factor that significantly reduces the productivity, and the invention of the edge mask shielding plate capable of preventing the adhesion of scattered zinc has been desired.
本発明は、このような経緯でなされた発明であり、溶融亜鉛めっきラインのガスワイピング部において、品質欠陥を引き起こす飛散亜鉛の発生を抑制しつつ、飛散亜鉛が付着しない手段を提供することである。 The present invention has been made in this way, and is to provide a means for preventing the adhesion of scattered zinc while suppressing the generation of scattered zinc that causes quality defects in the gas wiping portion of the hot-dip galvanizing line. ..
上記課題を解決するため、溶融亜鉛めっきラインのワイピングノズル部におけるエッジマスク遮蔽板であって、ワイピングノズルから吐出されたガスの衝突高さの中心をワイピング位置としたとき、当該ワイピング位置上で、かつ前記エッジマスク遮蔽板の鋼板エッジ側の遮蔽板端部を原点とし、当該原点から鋼板通板方向と逆の鉛直下方向への距離を高さH[mm]、当該原点から鋼板エッジ部から水平方向に離れる距離を幅L[mm]とするとき、下記式（１）の範囲を満たすことを特徴とする溶融亜鉛めっきラインのワイピングノズル部におけるエッジマスク遮蔽板とする。0.033*(鋼板衝突圧力[kPa])+0.0642 ≦ H ≦ 0.0146*L2+0.0746*L+0.3146*(鋼板衝突圧力[kPa])+0.8286 （１） In order to solve the above problem, when the edge mask shielding plate in the wiping nozzle portion of the hot-dip galvanizing line has the center of the collision height of the gas discharged from the wiping nozzle as the wiping position, the wiping position is changed. The origin is the edge of the edge mask shield plate on the edge side of the steel plate, and the distance from the origin to the vertical direction opposite to the direction of the steel plate is H [mm] in height, and from the origin to the edge of the steel plate. When the distance away in the horizontal direction is L [mm], the edge mask shielding plate in the wiping nozzle portion of the hot-dip galvanizing line is characterized by satisfying the range of the following formula (1). 0.033 * (Steel plate collision pressure [kPa]) +0.0642 ≤ H ≤ 0.0146 * L 2 +0.0746 * L +0.3146 * (Steel plate collision pressure [kPa]) +0.8286 (1)
また、溶融亜鉛めっきラインのワイピングノズル部における溶融亜鉛飛散防止方法であって、ワイピングノズルから吐出されたガスの衝突高さの中心をワイピング位置としたとき、当該ワイピング位置上で、かつ前記エッジマスク遮蔽板の鋼板エッジ側の遮蔽板端部を原点とし、当該原点から鋼板通板方向と逆の鉛直下方向への距離を高さH[mm]、当該原点から鋼板エッジ部から水平方向に離れる距離を幅L[mm]とするとき、当該HおよびLが下記式（１）の範囲内であるエッジマスク遮蔽板を用いることを特徴とする溶融亜鉛めっきラインのワイピングノズル部における溶融亜鉛飛散防止方法とする。0.033*(鋼板衝突圧力[kPa])+0.0642 ≦ H ≦ 0.0146*L2+0.0746*L+0.3146*(鋼板衝突圧力[kPa])+0.8286 （１） Further, in the method for preventing the scattering of molten zinc in the wiping nozzle portion of the hot-dip galvanizing line, when the center of the collision height of the gas discharged from the wiping nozzle is set as the wiping position, the edge mask is on the wiping position. The origin is the edge of the shielding plate on the edge side of the steel plate of the shielding plate, the distance from the origin in the vertical direction opposite to the direction of the steel plate is H [mm], and the distance from the origin is horizontally separated from the edge of the steel plate. When the distance is the width L [mm], the hot-dip galvanizing line is characterized by using an edge mask shielding plate whose H and L are within the range of the following formula (1). The method. 0.033 * (Steel plate collision pressure [kPa]) +0.0642 ≤ H ≤ 0.0146 * L 2 +0.0746 * L +0.3146 * (Steel plate collision pressure [kPa]) +0.8286 (1)
本発明は、溶融亜鉛めっきラインのガスワイピング後において、品質欠陥を引き起こす飛散亜鉛の発生を抑制しつつ、飛散亜鉛が付着しない手段を提供することができる。 INDUSTRIAL APPLICABILITY The present invention can provide a means to prevent scattered zinc from adhering while suppressing the generation of scattered zinc that causes quality defects after gas wiping of a hot-dip galvanizing line.
以下では、発明の実施形態について説明する。本実施形態のエッジマスク遮蔽板は、溶融亜鉛めっきラインのワイピングノズル部において使用されるものである。より具体的には、図１及び図２に示すように、亜鉛浴から引き揚げられた鋼板の鋼板エッジに隣接して配置されるものである。 Hereinafter, embodiments of the invention will be described. The edge mask shielding plate of the present embodiment is used in the wiping nozzle portion of the hot-dip galvanizing line. More specifically, as shown in FIGS. 1 and 2, they are arranged adjacent to the steel plate edge of the steel plate lifted from the zinc bath.
ガスワイピングは、ワイピングダイスからガスを吹き付けることでなされる。図２に示すことから理解されるように、エッジマスク遮蔽板は、亜鉛浴から引き揚げられた鋼板の側端と対向するように配置されている。このエッジマスク遮蔽板は、その目的からして、飛散亜鉛が鋼板に付着することを抑制しなくてはならないが、エッジマスク遮蔽板に飛散亜鉛が付着し続けることにより生じる弊害を抑制することも望まれる。 Gas wiping is performed by blowing gas from a wiping die. As can be seen from FIG. 2, the edge mask shielding plate is arranged so as to face the side edge of the steel plate lifted from the zinc bath. For the purpose of this edge mask shielding plate, it is necessary to suppress the adhesion of scattered zinc to the steel sheet, but it is also possible to suppress the harmful effects caused by the continuous adhesion of scattered zinc to the edge mask shielding plate. desired.
ところで、ガスワイピング時における亜鉛の飛散挙動は、ガスが鋼板に衝突する圧力である鋼板衝突圧力で変化する。また、ガスの鋼板衝突圧力は鋼板表面のZn付着量で変化する。一方、ラインスピードが変化してもZn付着量を一定の範囲に収める必要がある。そこで、一般的な溶融亜鉛めっきラインの最大級のラインスピード（例えば１５０ｍｐｍ）までの範囲の操業において、要求される鋼板表面のZn付着量(30〜60g/m2)を達成するために必要な鋼板衝突圧力を確認した。圧力センサーで確認したところ、この鋼板衝突圧力は、25〜60kPaであった。 By the way, the scattering behavior of zinc during gas wiping changes depending on the steel plate collision pressure, which is the pressure at which the gas collides with the steel sheet. In addition, the gas steel plate collision pressure changes depending on the amount of Zn adhered to the steel sheet surface. On the other hand, even if the line speed changes, it is necessary to keep the amount of Zn adhered within a certain range. Therefore, it is necessary to achieve the required amount of Zn adhesion (30 to 60 g / m 2 ) on the steel sheet surface in operations in the range up to the maximum line speed (for example, 150 mpm) of a general hot-dip galvanized line. The steel plate collision pressure was confirmed. When confirmed by the pressure sensor, the collision pressure of this steel sheet was 25 to 60 kPa.
次に、発明者らは、様々な形状のエッジマスク遮蔽板を用意し、上記の溶融亜鉛めっきラインのラインスピードと鋼板衝突圧力の範囲において、エッジマスク遮蔽板の形状と、品質欠陥を引き起こす飛散亜鉛の発生およびその抑制との関係を調査した。飛散亜鉛は主としてワイピングノズル部の衝突高さの中心から斜め下方に向かって飛散するため、エッジマスク遮蔽板の形状は、ワイピングノズル部の衝突高さの中心をワイピング位置としたとき、ワイピング位置より上については問わず、ワイピング位置以下についての形状を検討対象事項とした。 Next, the inventors prepared edge mask shielding plates of various shapes, and within the range of the line speed and the steel plate collision pressure of the hot-dip galvanizing line described above, the shape of the edge mask shielding plate and the scattering that caused quality defects. The relationship between zinc generation and its suppression was investigated. Since scattered zinc mainly scatters diagonally downward from the center of the collision height of the wiping nozzle, the shape of the edge mask shielding plate is different from the wiping position when the center of the collision height of the wiping nozzle is the wiping position. Regardless of the above, the shape below the wiping position was the subject of consideration.
エッジマスク遮蔽板の形状を調査するに際して、図３に示すように、鋼板エッジ側の遮蔽板端部かつワイピング位置を原点位置とした。エッジマスク遮蔽板は原点から鋼板通板方向と逆、すなわち鉛直下方向への距離を高さH[mm]とし、鋼板エッジ部から離れる方向の距離を幅L[mm]とした。この条件における実験結果を図４に示している。この実験結果より、品質欠陥を引き起こす飛散亜鉛の発生の有無と、鋼板エッジ部で発生してエッジマスク遮蔽板方向に飛散する飛散亜鉛の挙動は、共に鋼板衝突圧力の関数で表現できることが分かった。より具体的には、溶融亜鉛めっきラインの最大ラインスピードかつ鋼板衝突圧力が25〜60kPaの範囲において、品質欠陥を引き起こす飛散亜鉛の発生を抑制しつつ、エッジマスク遮蔽板に飛散亜鉛が付着しない形状は下記式（１）を満たす条件のものであることが分かった。 When investigating the shape of the edge mask shielding plate, as shown in FIG. 3, the edge portion of the shielding plate on the edge side of the steel plate and the wiping position were set as the origin position. The height of the edge mask shielding plate is opposite to that of the steel plate passing direction from the origin, that is, the distance in the vertical direction is H [mm], and the distance in the direction away from the steel plate edge is L [mm]. The experimental results under this condition are shown in FIG. From the results of this experiment, it was found that the presence or absence of scattered zinc that causes quality defects and the behavior of scattered zinc that is generated at the edge of the steel sheet and scattered in the direction of the edge mask shielding plate can both be expressed as a function of the steel sheet collision pressure. .. More specifically, in the maximum line speed of the hot-dip galvanizing line and the steel plate collision pressure in the range of 25 to 60 kPa, a shape in which scattered zinc does not adhere to the edge mask shielding plate while suppressing the generation of scattered zinc that causes quality defects. Was found to satisfy the condition of the following equation (1).
0.033*(鋼板衝突圧力[kPa])+0.0642 ≦ H ≦ 0.0146*L2+0.0746*L+0.3146*(鋼板衝突圧[kPa] )+0.8286
（ただし、原点から鉛直下方向への距離を高さH[mm]とし、原点から鋼板エッジ部から離れる方向の距離を幅L[mm]とし、鋼板衝突圧力はワイピングノズル部から吐出されたガスが鋼板に衝突するときの圧力[kPa]である。）
尚、鋼板衝突圧力は操業で実際に使用し得るワイピング条件にて鋼板を模擬したシート型の圧力センサーを対向するワイピングノズル間に配置し、別途測定した結果の最大値である。
0.033 * (Steel plate collision pressure [kPa]) +0.0642 ≤ H ≤ 0.0146 * L 2 +0.0746 * L +0.3146 * (Steel plate collision pressure [kPa]) +0.8286
(However, the distance from the origin in the vertical downward direction is the height H [mm], the distance from the origin in the direction away from the steel plate edge is the width L [mm], and the steel plate collision pressure is the gas discharged from the wiping nozzle. Is the pressure [kPa] when it collides with the steel plate.)
The steel plate collision pressure is the maximum value as a result of separately measuring by arranging a sheet-type pressure sensor simulating a steel plate between facing wiping nozzles under wiping conditions that can be actually used in operation.
したがって、この条件を満たすエッジマスク遮蔽板とすれば、エッジマスク遮蔽板への飛散亜鉛の付着を抑制しつつ、鋼板に飛散亜鉛が付着することも抑制できる。また、この条件を満たすエッジマスク遮蔽板を用いることで、溶融亜鉛の飛散を適切に抑制した結果、品質欠陥を引き起こす飛散亜鉛の発生を抑制しつつ、飛散亜鉛が付着しないエッジマスク遮蔽板が獲得できる。本発明の条件を満たすエッジマスク遮蔽板を使用したところ、エッジマスク遮蔽板の清掃頻度は、従来の３６回/３日から１回/３日に減少し、本発明は生産効率の向上に貢献するものとなることが確認された。 Therefore, if the edge mask shielding plate satisfying this condition is used, it is possible to suppress the adhesion of scattered zinc to the edge mask shielding plate and the adhesion of scattered zinc to the steel sheet. In addition, by using an edge mask shielding plate that satisfies this condition, as a result of appropriately suppressing the scattering of molten zinc, an edge mask shielding plate to which scattered zinc does not adhere while suppressing the generation of scattered zinc that causes quality defects is obtained. can. When an edge mask shielding plate satisfying the conditions of the present invention was used, the cleaning frequency of the edge mask shielding plate was reduced from the conventional 36 times / 3 days to 1 time / 3 days, and the present invention contributed to the improvement of production efficiency. It was confirmed that it would be.
本発明は、以上の実施形態には限定されることは無く、本発明の趣旨を逸脱しない範囲で適応可能なことは勿論のことである。 The present invention is not limited to the above embodiments, and it goes without saying that the present invention can be applied without departing from the spirit of the present invention.
Claims (2)
0.033*(鋼板衝突圧力[kPa])+0.0642 ≦ H ≦ 0.0146*L2+0.0746*L+0.3146*(鋼板衝突圧力[kPa])+0.8286 （１） It is an edge mask shielding plate in the wiping nozzle portion of the hot-dip galvanizing line, and the center of the collision height of the gas discharged from the wiping nozzle is set as the wiping position, and the steel plate edge of the edge mask shielding plate is on the wiping position. With the end of the shielding plate on the side as the origin, the distance from the origin in the vertical direction opposite to the steel plate passing direction is the height H [mm], and the distance from the origin in the horizontal direction from the steel plate edge is the width L [ mm], and an edge mask shielding plate in the wiping nozzle portion of the hot-dip galvanizing line, which satisfies the range of the following formula (1).
0.033 * (Steel plate collision pressure [kPa]) +0.0642 ≤ H ≤ 0.0146 * L 2 +0.0746 * L +0.3146 * (Steel plate collision pressure [kPa]) +0.8286 (1)
0.033*(鋼板衝突圧力[kPa])+0.0642 ≦ H ≦ 0.0146*L2+0.0746*L+0.3146*(鋼板衝突圧力[kPa])+0.8286 （１） A molten zinc shatterproof method in wiping nozzle portion of the galvanizing line, the center of the collision height of the gas discharged from the wiping nozzle as a wiping position, on the wiping position, either cane Jjimasuku shielding plate steel With the end of the shielding plate on the edge side as the origin, the distance from the origin in the vertical direction opposite to the steel plate passing direction is the height H [mm], and the distance from the origin in the horizontal direction from the steel plate edge is the width L. A method for preventing molten zinc scattering in a wiping nozzle portion of a hot-dip galvanizing line, which comprises using an edge mask shielding plate in which H and L are within the range of the following formula (1).
0.033 * (Steel plate collision pressure [kPa]) +0.0642 ≤ H ≤ 0.0146 * L 2 +0.0746 * L +0.3146 * (Steel plate collision pressure [kPa]) +0.8286 (1)
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| JPS63203758A (en) * | 1987-02-18 | 1988-08-23 | Hitachi Ltd | Edge bar coat prevention device for molten metal plating equipment |
| BR112014004234B1 (en) * | 2011-09-22 | 2020-11-10 | Nippon Steel Corporation | device for wiping steel sheet and hot-dip coating device |
| JP2014080673A (en) * | 2012-09-25 | 2014-05-08 | Nippon Steel & Sumitomo Metal | Method and apparatus for suppressing splash scattering |
| JP6088188B2 (en) * | 2012-09-27 | 2017-03-01 | 日新製鋼株式会社 | Plating metal strip manufacturing equipment and manufacturing method |
| JP6102382B2 (en) * | 2013-03-18 | 2017-03-29 | 新日鐵住金株式会社 | Gas wiping device |
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