JP2005256050A - Method and apparatus for adjusting surface appearance of hot-dipped steel sheet - Google Patents

Method and apparatus for adjusting surface appearance of hot-dipped steel sheet Download PDF

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JP2005256050A
JP2005256050A JP2004067405A JP2004067405A JP2005256050A JP 2005256050 A JP2005256050 A JP 2005256050A JP 2004067405 A JP2004067405 A JP 2004067405A JP 2004067405 A JP2004067405 A JP 2004067405A JP 2005256050 A JP2005256050 A JP 2005256050A
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JP4468718B2 (en
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Koji Yamashita
幸士 山下
Yasushi Araya
泰 荒谷
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Nippon Steel Nisshin Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To adjust the surface of a steel sheet hot-dipped through immersion in a plating bath into various appearances, by spraying a gas to the surface to cool it and controlling a cooling rate during cooling it. <P>SOLUTION: This adjusting method comprises spraying the gas to the surface of the hot-dipped steel sheet 3a which has been plated by being immersed in the plating bath 2 and has adjusted coating weight, with the use of a gas cooling means 10 capable of adjusting its cooling ability, to cool the surface; and adjusting the cooling rate when spraying the gas to the steel sheet 3a, to adjust the surface appearance. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、溶融めっき鋼板の表面外観調整方法および表面外観調整装置に関する。   The present invention relates to a surface appearance adjustment method and a surface appearance adjustment device for a hot-dip galvanized steel sheet.

亜鉛(Zn)系またはアルミニウム(Al)系などの溶融めっき鋼板は、耐食性および加工性に優れ、また安価であることから、建材、自動車部材、家電部材、ガードレールなど種々の用途に用いられている。したがって、溶融めっき鋼板には、用途に応じて光輝く表面外観から防眩性を有する表面外観まで幅広い仕様が求められている。たとえば建材という一つの用途においても、建屋内の装飾用途としては好適な光輝く表面外観の溶融めっき鋼板を、道路に面した壁用建材に用いると、溶融めっき鋼板が太陽光を反射し、道路を通行する歩行者および自動車の運転者の目を眩惑するので、安全上の問題が生じる。このように、溶融めっき鋼板は、一律の表面外観では多種の用途に対応することができないので、個々の用途に応じた好適な表面外観のものが求められている。   Galvanized steel sheets such as zinc (Zn) or aluminum (Al) are excellent in corrosion resistance and workability, and are inexpensive, so they are used in various applications such as building materials, automobile members, home appliance members, and guardrails. . Accordingly, the hot-dip plated steel sheet is required to have a wide range of specifications ranging from a bright surface appearance to an antiglare surface appearance depending on the application. For example, even in one application called building materials, if a hot-dip hot-dip galvanized steel sheet is used as a building material for walls facing the road, the hot-dip galvanized steel sheet reflects sunlight, Safety problems arise because the eyes of pedestrians and automobile drivers passing through are dazzled. As described above, the hot-dip plated steel sheet cannot be used for various applications with a uniform surface appearance, and therefore, a sheet with a suitable surface appearance corresponding to each application is required.

溶融めっき鋼板の表面外観として採り上げられる主なものにスパングル径と表面光沢とがある。   The main thing picked up as the surface appearance of hot dip plated steel sheet is spangle diameter and surface gloss.

スパングル径は、めっき浴の組成によって定まり、スパングル径の調整は、従来次のように行われている。スパングル径を特に調整することを意図しない場合、すなわちスパングル径が大きくなっても良い場合、めっき浴を主組成のめっき金属のみによって構成し、主組成のめっき金属以外の微量元素をめっき浴に添加しない。一方、スパングル径を小さく抑制する場合、めっき金属以外に、たとえばアンチモン(Sb)などの微量元素をめっ浴に添加している。このように、スパングル径はめっき浴の組成によって定まり、溶融めっき鋼板のめっきの組成は需要家毎に定まっているので、めっきの組成が予め定められている一鋼種を対象として溶融めっき鋼板のスパングル径の大きさを自在にコントロールすることは困難である。   The spangle diameter is determined by the composition of the plating bath, and the adjustment of the spangle diameter is conventionally performed as follows. If it is not intended to adjust the spangle diameter, that is, if the spangle diameter may be increased, the plating bath is composed only of the plating metal of the main composition, and trace elements other than the plating metal of the main composition are added to the plating bath. do not do. On the other hand, when suppressing the spangle diameter to a small value, a trace element such as antimony (Sb) is added to the bath in addition to the plated metal. In this way, the spangle diameter is determined by the composition of the plating bath, and the plating composition of the hot dip plated steel sheet is determined for each customer. Therefore, the spangle of the hot dip plated steel sheet is intended for one steel type whose plating composition is predetermined. It is difficult to freely control the diameter.

溶融めっき鋼板の表面光沢は、溶融めっき鋼板のめっき層が凝固して冷却された後に、軽度の圧下を与えて圧延する調質圧延を施すことによって調整されている。この調質圧延における表面光沢は、圧延に用いるワークロールの表面粗度に依存する。したがって、調質圧延における表面光沢の調整は、ワークロールの表面粗度を、研磨仕上げまたはダル仕上げなどのように変化させることによって行われている。しかしながら、ワークロールの表面粗度は、調質圧延における溶融めっき鋼板とワークロールとの摩擦に起因し、調質圧延の継続に伴って経時的に変化するので、所望の表面光沢を有する溶融めっき鋼板を長時間にわたって安定して得ることが困難という問題がある。   The surface gloss of the hot dip galvanized steel sheet is adjusted by subjecting the galvanized steel sheet to temper rolling which is rolled by applying a slight reduction after the plating layer of the hot dip galvanized steel sheet is solidified and cooled. The surface gloss in this temper rolling depends on the surface roughness of the work roll used for rolling. Therefore, the adjustment of the surface gloss in the temper rolling is performed by changing the surface roughness of the work roll such as polishing finish or dull finish. However, the surface roughness of the work roll is caused by friction between the hot-dip plated steel sheet and the work roll in the temper rolling, and changes with time as the temper rolling is continued. There is a problem that it is difficult to stably obtain a steel plate for a long time.

このような問題を解決する従来技術の一つに、めっき浴に素鋼板を浸漬して引き出した後ガスワイピングし、引き続きめっき層凝固開始温度以上の板温で気水スプレー冷却することによって、めっき層表面の眩しさを抑えた溶融Zn系めっき鋼板を製造する方法がある(特許文献1参照)。   One of the conventional techniques for solving such problems is that the steel sheet is immersed in a plating bath and then pulled out, followed by gas wiping, followed by air-water spray cooling at a plate temperature higher than the plating layer solidification start temperature. There is a method for producing a hot-dip Zn-based plated steel sheet in which the glare of the layer surface is suppressed (see Patent Document 1).

しかしながら、この従来技術には、次のような問題がある。めっき鋼板の冷却に気水スプレー、すなわち空気と水との混合流体を用いるので、水による伝熱とともに気化熱によってめっき鋼板が急冷される。この急冷によって、めっき層表面の光沢度が100以下の眩しさを抑えためっき鋼板を得ることができるけれども、光輝く表面と眩しさを抑えた表面との中間仕様の光沢度を有するようなめっき鋼板を得ることができないという問題がある。すなわち、急冷以外の水準の冷却速度に制御することが困難であるという問題がある。   However, this conventional technique has the following problems. Since an air-water spray, that is, a mixed fluid of air and water is used for cooling the plated steel sheet, the plated steel sheet is rapidly cooled by heat of vaporization along with heat transfer by water. By this rapid cooling, it is possible to obtain a plated steel sheet in which the glare on the surface of the plating layer is suppressed to 100 or less. However, the plating has a gloss of intermediate specifications between the bright surface and the surface with reduced glare. There is a problem that a steel plate cannot be obtained. That is, there is a problem that it is difficult to control the cooling rate to a level other than the rapid cooling.

特開平10−88310号公報JP-A-10-88310

本発明の目的は、めっき浴に浸漬されてめっき処理が施された溶融めっき鋼板に、ガスを吹付けることによって冷却し、その冷却時における冷却速度の制御によって種々の表面外観に調整することのできる溶融めっき鋼板の表面外観調整方法および表面外観調整装置を提供することである。   An object of the present invention is to cool a hot-dip plated steel sheet immersed in a plating bath and apply a plating treatment by blowing a gas, and to adjust various surface appearances by controlling the cooling rate at the time of cooling. It is to provide a surface appearance adjustment method and a surface appearance adjustment device for a hot-dip plated steel sheet.

本発明は、めっき浴に鋼板を浸漬してめっき処理を施し、
めっき処理された溶融めっき鋼板のめっき付着量を調整し、
溶融めっき鋼板の表面にガスを吹付けて冷却するガス冷却手段であって、冷却能力の調整が可能なガス冷却手段を用いて、めっき付着量調整後の溶融めっき鋼板を冷却し、
溶融めっき鋼板の冷却時に溶融めっき鋼板の冷却速度を調整することによって表面外観を調整することを特徴とする溶融めっき鋼板の表面外観調整方法である。
The present invention performs a plating process by immersing a steel plate in a plating bath,
Adjust the plating adhesion amount of the plated hot-dip plated steel sheet,
A gas cooling means for spraying and cooling gas on the surface of the hot dip plated steel sheet, using the gas cooling means capable of adjusting the cooling capacity, cooling the hot dip plated steel sheet after adjusting the coating amount,
A surface appearance adjustment method for a hot-dip plated steel sheet, characterized by adjusting a surface appearance by adjusting a cooling rate of the hot-dip plated steel sheet during cooling of the hot-dip plated steel sheet.

また本発明は、溶融めっき鋼板の冷却速度の調整が、ガス冷却手段から溶融めっき鋼板に吹付けるガスの量を調整することによって行われることを特徴とする。   The present invention is characterized in that the adjustment of the cooling rate of the hot dip plated steel sheet is performed by adjusting the amount of gas sprayed from the gas cooling means to the hot dip plated steel sheet.

また本発明は、溶融めっき鋼板の表面外観が、表面光沢および/またはスパングル径であることを特徴とする。   Further, the present invention is characterized in that the surface appearance of the hot dip plated steel sheet is surface gloss and / or spangle diameter.

また本発明は、搬送途中でめっき浴に浸漬されてめっき処理が施される溶融めっき鋼板のめっき処理後の冷却速度を調整することによって、その表面外観を調整する溶融めっき鋼板の表面外観調整装置において、
めっき浴に浸漬後の溶融めっき鋼板であって表面外観が調整される前の溶融めっき鋼板の温度を検出する第1温度検出手段と、
めっき浴に浸漬後の溶融めっき鋼板に対してガスを吹付けて冷却するガス噴射手段と、
ガス噴射手段にガスを供給するガス供給手段と、
ガス噴射手段によってガスが吹付けられて冷却された溶融めっき鋼板の温度を検出する第2温度検出手段と、
溶融めっき鋼板の搬送速度を検出する搬送速度検出手段と、
第1温度検出手段、第2温度検出手段および搬送速度検出手段の検出出力に応答し、ガス供給手段によるガス供給量を制御する制御手段とを含むことを特徴とする溶融めっき鋼板の表面外観調整装置である。
In addition, the present invention provides a surface appearance adjusting device for a hot-dip galvanized steel sheet, which adjusts the surface appearance by adjusting the cooling rate after the plating process of the hot-dip galvanized steel sheet, which is immersed in the plating bath in the middle of conveyance and subjected to the plating process. In
First temperature detecting means for detecting the temperature of the hot-dip plated steel sheet after being immersed in the plating bath and before the surface appearance is adjusted;
A gas injection means for cooling the hot-dip plated steel sheet after being immersed in the plating bath by spraying a gas;
Gas supply means for supplying gas to the gas injection means;
A second temperature detecting means for detecting the temperature of the hot-dip plated steel sheet cooled by the gas spraying means;
A transport speed detecting means for detecting the transport speed of the hot dip plated steel sheet,
A surface appearance adjustment of a hot-dip galvanized steel sheet, comprising: a control means for controlling a gas supply amount by the gas supply means in response to detection outputs of the first temperature detection means, the second temperature detection means and the conveyance speed detection means Device.

本発明によれば、めっき浴に鋼板を浸漬してめっき処理を施し、めっき付着量を調整した後、溶融めっき鋼板の表面にガスを吹付けて冷却する。溶融めっき鋼板の冷却に際しては、水を用いることなくガスのみを用い、さらにガスを吹付けて冷却するガス冷却手段に冷却能力の調整が可能なものを用いるので、溶融めっき鋼板を急冷してしまうことなく、その冷却速度を調整することが可能である。このことによって、表面外観の要素であるスパングル径および/または表面光沢が所望の状態に調整された溶融めっき鋼板を得ることができる。   According to the present invention, a steel sheet is immersed in a plating bath to perform plating treatment, and after adjusting the plating adhesion amount, the surface of the hot dip plated steel sheet is sprayed and cooled. When cooling hot dip plated steel sheets, only gas is used without using water, and gas cooling means that can be cooled by spraying gas is used so that the cooling capacity can be adjusted. The cooling rate can be adjusted without any problem. As a result, a hot-dip plated steel sheet in which the spangle diameter and / or surface gloss, which are elements of the surface appearance, are adjusted to a desired state can be obtained.

また本発明によれば、めっき処理後の溶融めっき鋼板にガスを吹付けて冷却するに際し、ガス量の制御を通じて冷却速度を制御することによって、溶融めっき鋼板の表面外観、たとえばスパングル径、表面光沢などを所望の状態に調整することのできる溶融めっき鋼板の表面外観調整装置が実現される。   Further, according to the present invention, when cooling is performed by spraying a gas on the hot dip plated steel sheet after the plating treatment, the surface appearance of the hot dip plated steel sheet, for example, spangle diameter, surface gloss, is controlled by controlling the cooling rate through the control of the gas amount. Thus, a surface appearance adjustment device for a hot-dip galvanized steel sheet capable of adjusting the above to a desired state is realized.

図1は、本発明の実施の一形態である溶融めっき鋼板の表面外観調整装置1の構成を簡略化して示す図である。溶融めっき鋼板の表面外観調整装置1(以後、表面外観調整装置1と略称する)は、めっき浴2に浸漬後の溶融めっき鋼板であって表面外観が調整される前の溶融めっき鋼板3aの温度を検出する第1温度検出手段4と、めっき浴2に浸漬後の溶融めっき鋼板3aに対してガスを吹付けるガス噴射手段5と、ガス噴射手段5にガスを供給するガス供給手段6と、ガス噴射手段5によってガスが吹付けられて冷却された溶融めっき鋼板3bの温度を検出する第2温度検出手段7と、溶融めっき鋼板、より厳密にはめっき処理が施される前の鋼板3cの搬送速度を検出する搬送速度検出手段8と、第1温度検出手段4、第2温度検出手段7および搬送速度検出手段8の検出出力に応答し、ガス供給手段6によるガス供給量を制御する制御手段9とを含んで構成される。なお、本明細書における「鋼板」は、長手方向に長大な鋼板の一形態である鋼帯をも含めた意味に用いられる。   FIG. 1 is a diagram showing a simplified configuration of a surface appearance adjusting device 1 for a hot-dip plated steel sheet according to an embodiment of the present invention. The surface appearance adjusting device 1 (hereinafter abbreviated as “surface appearance adjusting device 1”) of the hot-dip plated steel sheet is a hot-dip hot-dip steel plate immersed in the plating bath 2 and the temperature of the hot-dip hot-dip steel plate 3a before the surface appearance is adjusted. A first temperature detection means 4 for detecting gas, a gas injection means 5 for blowing a gas to the hot-dip plated steel sheet 3a immersed in the plating bath 2, a gas supply means 6 for supplying gas to the gas injection means 5, The second temperature detecting means 7 for detecting the temperature of the hot dip plated steel sheet 3b cooled by the gas spraying means 5 and the hot dip galvanized steel sheet, more precisely, the steel plate 3c before being plated. Control for controlling the gas supply amount by the gas supply means 6 in response to the detection output of the conveyance speed detection means 8 for detecting the conveyance speed, the first temperature detection means 4, the second temperature detection means 7, and the conveyance speed detection means 8. Mean 9 and They comprise constructed. In the present specification, the “steel plate” is used to mean a steel strip that is a form of a steel plate that is long in the longitudinal direction.

表面外観調整装置1は、図1に要部を示す溶融めっき設備に設けられる。溶融めっき設備は、大略、不図示の巻戻装置および洗浄装置等の前処理装置、たとえば還元炉方式の焼鈍炉11、めっき浴2を貯留するポット12、めっき付着量を調整する一対のガスワイピングノズル13a,13b、不図示の水冷装置、後処理装置、調質圧延装置および巻取装置を含む構成である。溶融めっき設備において、鋼板3cは、巻戻装置から巻戻されて前処理装置で前処理され、焼鈍炉11で活性化された後、焼鈍炉11の出側に連なって設けられるスナウト14を通り、ポット12に貯留されるめっき浴2に浸漬されて溶融めっき処理される。めっき浴2に浸漬された鋼板3cは、めっき浴2中に設けられるシンクロール15によって搬送方向を反転されてめっき浴2から引上げられ、ガスワイピングノズル13a,13bによってめっき付着量が調整される。さらにめっき付着量の調整された溶融めっき鋼板3bは、水冷装置で水冷された後、後処理装置で後処理され、必要に応じて調質圧延されて巻取装置で巻取られる。   The surface appearance adjusting device 1 is provided in a hot dipping facility whose main part is shown in FIG. The hot dip plating equipment is generally a pretreatment device such as a rewinding device and a cleaning device (not shown), for example, a reduction furnace type annealing furnace 11, a pot 12 for storing the plating bath 2, and a pair of gas wipings for adjusting the amount of plating adhesion. The configuration includes nozzles 13a and 13b, a water cooling device (not shown), a post-processing device, a temper rolling device, and a winding device. In the hot dipping equipment, the steel sheet 3c is unwound from the rewinding device, pretreated by the pretreatment device, activated by the annealing furnace 11, and then passes through the snout 14 provided continuously to the outlet side of the annealing furnace 11. Then, it is immersed in the plating bath 2 stored in the pot 12 and subjected to hot dipping. The steel plate 3c immersed in the plating bath 2 is pulled up from the plating bath 2 with its conveying direction reversed by a sink roll 15 provided in the plating bath 2, and the amount of plating adhered is adjusted by the gas wiping nozzles 13a and 13b. Further, the hot-dip plated steel sheet 3b with the adjusted plating adhesion amount is water-cooled by a water-cooling device, then post-treated by a post-processing device, temper-rolled as necessary, and wound by a winding device.

溶融めっきに用いられるめっき金属は、Zn、Zn合金、Al、Al合金、Zn−Al合金のいずれであっても良い。   The plating metal used for hot dipping may be any of Zn, Zn alloy, Al, Al alloy, and Zn—Al alloy.

表面外観調整装置1は、溶融めっき設備のガスワイピングノズル13a,13bと不図示の水冷装置との間であって、めっき浴2から引上げられた溶融めっき鋼板3aのめっき金属が未だ凝固していない位置に設けられ、めっき浴に浸漬後めっき付着量が調整された溶融めっき鋼板3aの冷却速度を調整することによって、溶融めっき鋼板3aの表面外観を調整することに用いられる。   The surface appearance adjustment device 1 is between the gas wiping nozzles 13a, 13b of the hot dipping equipment and a water cooling device (not shown), and the plated metal of the hot dipped steel plate 3a pulled up from the plating bath 2 has not yet solidified. It is used to adjust the surface appearance of the hot dip plated steel sheet 3a by adjusting the cooling rate of the hot dip galvanized steel sheet 3a that is provided at the position and whose plating adhesion amount is adjusted after being immersed in the plating bath.

本実施の形態では、表面外観調整装置1の第1温度検出手段4は、めっき浴2の温度と、めっき浴2から引上げられ表面外観が調整される前の溶融めっき鋼板3aの温度とがほぼ等しいとみなして、めっき浴2の温度測定位置に設けられる。この第1温度検出手段4は、温度センサであり、めっき浴2中に浸漬される熱電対であっても良く、また非接触型の放射温度計などであっても良い。またガス噴射手段5に対して矢符16で示す溶融めっき鋼板3a,3bの搬送方向下流側に設けられる第2温度検出手段7も温度センサであり、公知の接触型または非接触型の温度センサを用いることができる。鋼板3cの搬送速度検出手段8は、速度センサであり、公知の回転計型の速度センサまたは光学的速度検出センサなどを用いることができる。これらの第1温度検出手段4、第2温度検出手段7および搬送速度検出手段8は、制御手段9に電気的に接続される。   In the present embodiment, the first temperature detecting means 4 of the surface appearance adjusting device 1 is substantially the same as the temperature of the plating bath 2 and the temperature of the hot-dip plated steel sheet 3a that is pulled up from the plating bath 2 and before the surface appearance is adjusted. It is assumed that they are equal and is provided at the temperature measurement position of the plating bath 2. The first temperature detecting means 4 is a temperature sensor, and may be a thermocouple immersed in the plating bath 2 or a non-contact type radiation thermometer. The second temperature detecting means 7 provided on the downstream side in the conveying direction of the hot-dip plated steel plates 3a and 3b indicated by an arrow 16 with respect to the gas injection means 5 is also a temperature sensor, and is a known contact type or non-contact type temperature sensor. Can be used. The conveyance speed detection means 8 of the steel plate 3c is a speed sensor, and a known tachometer type speed sensor or an optical speed detection sensor can be used. These first temperature detection means 4, second temperature detection means 7 and transport speed detection means 8 are electrically connected to the control means 9.

ガス噴射手段5は、溶融めっき鋼板3aの表裏面をそれぞれ臨んで一対が設けられる。図2は、ガス噴射手段5の構成を簡略化して示す図である。一対のガス噴射手段5は、溶融めっき鋼板3aに関してほぼ対称な形状を有するので、一対のうち一方にはアルファベットのaを添付し、他方にはアルファベットのbを添付した同一の参照符号を付し、その構成の説明においては、一対のうち一方についてのみ説明し他方の説明を省略する。なお、ガス噴射手段5の各部位については、一対の両者に共通して述べる場合、アルファベットの添字を除いた参照符にて表すことがある。図2(a)は、ガス噴射手段5a,5bを溶融めっき鋼板3aの幅方向の端部側、すなわち側面から見た図である。また図2(b)は、ガス噴射手段5aを溶融めっき鋼板3aの位置から見た正面図である。   A pair of gas injection means 5 is provided facing the front and back surfaces of the hot-dip plated steel sheet 3a. FIG. 2 is a diagram showing a simplified configuration of the gas injection means 5. Since the pair of gas injection means 5 has a substantially symmetrical shape with respect to the hot-dip plated steel sheet 3a, one of the pair is attached with the same reference numeral with the letter a and the other with the letter b. In the description of the configuration, only one of the pair will be described and the description of the other will be omitted. In addition, about each site | part of the gas injection means 5, when describing in common with a pair of both, it may represent with the reference mark except the alphabetic suffix. FIG. 2 (a) is a view of the gas injection means 5a, 5b as viewed from the end in the width direction of the hot-dip plated steel sheet 3a, that is, from the side. Moreover, FIG.2 (b) is the front view which looked at the gas-injection means 5a from the position of the hot-dip plated steel plate 3a.

ガス噴射手段5aは、鋼製の大略直方体形状の箱型容器部材である。ガス噴射手段5aの溶融めっき鋼板3aを臨む面21aには、矢符16で示す溶融めっき鋼板3a,3bの搬送方向に対して直交する方向に延びて複数のスリット22が形成される。この溶融めっき鋼板3aを臨んで形成される複数のスリット22は、溶融めっき鋼板3aを冷却する媒体であるガス、ここでは空気の噴出口として機能する。ガス噴射手段5a,5bは、溶融めっき鋼板3aを臨む面21a,21b同士が対向するように配置され、めっき鋼板3aを臨む面21a,21b同士によって形成される隙間に、溶融めっき鋼板3aを通板させ、溶融めっき鋼板3aにスリット22から空気を噴射して冷却する構成である。   The gas injection means 5a is a substantially rectangular parallelepiped box-shaped container member made of steel. A plurality of slits 22 are formed on the surface 21a of the gas injection means 5a facing the hot-dip plated steel sheet 3a so as to extend in a direction orthogonal to the conveying direction of the hot-dip plated steel sheets 3a and 3b indicated by arrows 16. The plurality of slits 22 formed so as to face the hot-dip plated steel sheet 3a function as a gas, which is a medium for cooling the hot-dip plated steel sheet 3a, here as an air outlet. The gas injection means 5a, 5b are arranged so that the surfaces 21a, 21b facing the hot-dip plated steel plate 3a face each other, and the hot-dip plated steel plate 3a is passed through a gap formed by the surfaces 21a, 21b facing the plated steel plate 3a. It is a structure which makes it plate and injects air from the slit 22 to the hot-dip plated steel plate 3a, and cools.

ガス噴射手段5aの寸法は、溶融めっき鋼板3aの搬送方向に垂直な幅方向に全体を冷却することができる寸法であれば特に限定されるものではないけれども、本実施の形態では、約650×1500×7350の大きさに形成される。 Although the dimension of the gas injection means 5a will not be specifically limited if it is a dimension which can cool the whole in the width direction perpendicular | vertical to the conveyance direction of the hot-dip plated steel plate 3a, In this Embodiment, it is about 650 D. It is formed in a size of × 1500 w × 7350 L.

溶融めっき鋼板3aを臨む面21aに連なる側面23aには、ガス噴射手段5aの長手方向の中央寄りに2つの第1および第2ガス供給口24a,25aが形成される。第1ガス供給口24aには、第1送気ダクト26aが接続され、第2ガス供給口25aには、第2送気ダクト27aが接続される。第1および第2送気ダクト26a,27aの内部には、ヘッダー圧力を調整するためのダンパ28が設けられる。この第1および第2送気ダクト26a,27aの他端部は、ガス供給手段6に接続される。   Two first and second gas supply ports 24a and 25a are formed on the side surface 23a connected to the surface 21a facing the hot-dip plated steel plate 3a, closer to the center in the longitudinal direction of the gas injection means 5a. A first air supply duct 26a is connected to the first gas supply port 24a, and a second air supply duct 27a is connected to the second gas supply port 25a. A damper 28 for adjusting the header pressure is provided inside the first and second air supply ducts 26a and 27a. The other ends of the first and second air supply ducts 26 a and 27 a are connected to the gas supply means 6.

本実施の形態では、ガス供給手段6は、インバータなどの周波数調整手段を備える交流モータ29と、送気ファン30とを備える。交流モータ29に備わるインバータは、後述する制御手段9からの動作指示信号に従い、交流モータ29の駆動電源であるたとえば商用電源から入力される電力周波数を可変に調整することによって、交流モータ29の回転数を可変に設定することができる。送気ファン30は、公知のファンを用いることができ、交流モータ29によって回転駆動される。この送気ファン30に第1および第2送気ダクト26a,27aの他端部が接続される。したがって、交流モータ29で回転駆動される送気ファン30によって送給される空気が第1および第2送気ダクト26a,27aを流過し、第1および第2供給口24a,25aからガス噴射手段5aに供給される。   In the present embodiment, the gas supply unit 6 includes an AC motor 29 including a frequency adjusting unit such as an inverter, and an air supply fan 30. The inverter provided in the AC motor 29 rotates the AC motor 29 by variably adjusting a power frequency input from, for example, a commercial power supply, which is a driving power source of the AC motor 29, in accordance with an operation instruction signal from the control means 9 described later. The number can be set variably. A known fan can be used as the air supply fan 30, and the air supply fan 30 is rotationally driven by an AC motor 29. The other ends of the first and second air supply ducts 26a and 27a are connected to the air supply fan 30. Therefore, the air supplied by the air supply fan 30 that is rotationally driven by the AC motor 29 flows through the first and second air supply ducts 26a and 27a, and gas is injected from the first and second supply ports 24a and 25a. It is supplied to the means 5a.

前述のように、交流モータ29の回転数が可変に設定されるので、交流モータ29で回転駆動される送気ファン30の回転数を可変に設定することができる。送気ファン30の回転数が可変に設定されることによって、第1および第2ダクト26a,27aを流過し、第1および第2供給口24a,25aからガス冷却手段5aに供給される空気の量、すなわちガス冷却手段5aから溶融めっき鋼板3aに対して吹付けられる空気の量が、可変に設定される。これらのガス供給手段6とガス噴射手段5とは、ガス冷却手段10を構成する。このように、ガス供給手段6からガス噴射手段5に供給される空気量を可変設定することによって、ガス冷却手段10の冷却能力を調整することができる。   As described above, since the rotational speed of the AC motor 29 is variably set, the rotational speed of the air supply fan 30 that is rotationally driven by the AC motor 29 can be variably set. The air supplied through the first and second ducts 26a and 27a and supplied to the gas cooling means 5a from the first and second supply ports 24a and 25a by setting the rotational speed of the air supply fan 30 to be variable. , That is, the amount of air blown from the gas cooling means 5a to the hot dip plated steel sheet 3a is variably set. These gas supply means 6 and gas injection means 5 constitute a gas cooling means 10. Thus, the cooling capacity of the gas cooling means 10 can be adjusted by variably setting the amount of air supplied from the gas supply means 6 to the gas injection means 5.

制御手段9は、たとえば中央処理装置(CPU)とメモリとを含む処理回路によって実現される。メモリは、読出し専用メモリと随時書込み/読出し可能なメモリとの両者を備えることが好ましい。読出し専用メモリには、表面外観調整装置1の全体動作を制御するためのプログラムなどがストアされ、随時書込み/読出し可能なメモリには、溶融めっき設備に通板される鋼帯毎の製造仕様データなどがストアされる。なお、随時書込み/読出し可能なメモリが、制御手段9に備わる構成に限定されることなく、溶融めっき設備に通板される鋼帯毎の製造仕様データなどが、鋼帯毎に上位のコンピュータから制御手段9に与えられるように構成されても良い。   The control means 9 is realized by a processing circuit including, for example, a central processing unit (CPU) and a memory. The memory preferably comprises both a read-only memory and a memory that can be written / read at any time. The read-only memory stores a program for controlling the overall operation of the surface appearance adjusting device 1 and the like, and the memory that can be written / read from time to time has manufacturing specification data for each steel strip passed through the hot dipping equipment. Etc. are stored. The memory that can be written / read at any time is not limited to the configuration provided in the control means 9, and the manufacturing specification data for each steel strip passed through the hot dipping equipment can be obtained from the upper computer for each steel strip. You may comprise so that the control means 9 may be given.

制御手段9は、第1温度検出手段4、第2温度検出手段7および搬送速度検出手段8の検出出力に応答し、溶融めっき鋼板3aが所望の冷却速度になるように、ガス噴射手段5に対するガス供給手段6による空気供給量を制御する。   The control means 9 responds to the detection outputs of the first temperature detection means 4, the second temperature detection means 7 and the conveyance speed detection means 8, and controls the gas injection means 5 so that the hot dip plated steel sheet 3a has a desired cooling rate. The air supply amount by the gas supply means 6 is controlled.

以下制御手段9による空気供給量の制御について説明する。まず、溶融めっき鋼板3aの目標冷却速度MVcは、次のようにして求められる。ガス噴射手段5への入側温度の代替温度であるめっき浴2の目標温度MT1は、めっき浴組成によって定まる。鋼板の目標搬送速度MVは、各鋼板毎の製造標準によって定められる。ガス噴射手段5の鋼板搬送方向の長さLは、表面外観調整装置1の設計仕様から定まるので、溶融めっき鋼板3aがガス冷却手段5を通過するのに要する目標時間MSは、MS=L/MVで与えられる。したがって、ガス冷却手段5の出側の目標温度MT2を所望の温度に設定することによって、目標冷却速度MVcは、式(1)によって求められる。
MVc=(MT2−MT1)/MS …(1)
Hereinafter, control of the air supply amount by the control means 9 will be described. First, the target cooling rate MVc of the hot-dip plated steel sheet 3a is obtained as follows. The target temperature MT1 of the plating bath 2, which is an alternative temperature to the gas injection means 5, is determined by the plating bath composition. The target conveying speed MV of the steel plate is determined by the manufacturing standard for each steel plate. Since the length L of the gas injection means 5 in the direction of conveying the steel sheet is determined from the design specifications of the surface appearance adjusting device 1, the target time MS required for the hot-dip plated steel sheet 3a to pass through the gas cooling means 5 is MS = L / Given in MV. Therefore, by setting the target temperature MT2 on the outlet side of the gas cooling means 5 to a desired temperature, the target cooling rate MVc is obtained by the equation (1).
MVc = (MT2-MT1) / MS (1)

一方、実測の冷却速度Vcは、第1温度検出手段4による検出温度T1、第2温度検出手段7による検出温度T2および搬送速度検出手段8による検出速度Vを用いて、式(2)によって求められる。なお、式(2)に示すSは、溶融めっき鋼板3aのガス噴射手段5を通過するのに要する時間であり、S=L/Vで与えられる。
Vc=(T2−T1)/S …(2)
On the other hand, the actually measured cooling speed Vc is obtained by the equation (2) using the detected temperature T1 by the first temperature detecting means 4, the detected temperature T2 by the second temperature detecting means 7, and the detected speed V by the transport speed detecting means 8. It is done. In addition, S shown in Formula (2) is time required to pass through the gas injection means 5 of the hot dip plated steel sheet 3a, and is given by S = L / V.
Vc = (T2-T1) / S (2)

目標冷却速度MVcは、製造する溶融めっき鋼板毎に、予め入力されてメモリにストアされたものが読出されて用いられても良く、また上位コンピュータから制御手段9に与えられても良い。制御手段9は、第1温度検出手段4、第2温度検出手段7および搬送速度検出手段8の検出出力に応答し、冷却速度Vcを演算するとともに、式(3)に基づいて冷却速度偏差ΔVcを演算し、この冷却速度偏差ΔVcが零(0)になるように、ガス供給手段6に動作指示信号を出力してガス噴射手段5に供給する空気量を制御する。
ΔVc=MVc−Vc …(3)
The target cooling rate MVc may be read and used in advance for each hot-dip plated steel sheet to be manufactured and stored in the memory, or may be given to the control means 9 from a host computer. The control means 9 responds to the detection outputs of the first temperature detection means 4, the second temperature detection means 7 and the conveyance speed detection means 8, calculates the cooling speed Vc, and based on the equation (3), the cooling speed deviation ΔVc. And an operation instruction signal is output to the gas supply means 6 to control the amount of air supplied to the gas injection means 5 so that the cooling speed deviation ΔVc becomes zero (0).
ΔVc = MVc−Vc (3)

本実施の形態の表面外観調整装置1では、ガス供給手段6によるガス噴射手段5への空気供給量は、ガス供給手段6の交流モータ29に入力される電力周波数に対応する送気ファン30の回転数によって定まる。図3および図4には、本実施の形態の表面外観調整装置1における交流モータ29に入力される電力周波数に対応する送気ファン30の回転数と、送気ファン30の回転数に対応する装置出力との関係を例示する。図3は交流モータ29の電力周波数と送気ファン30の回転数との関係を示す図であり、図4は送気ファン30の回転数とAJC出力との関係を示す図である。なお、表面外観調整装置1は、空気を溶融めっき鋼板3aに吹付けて冷却するので、表面外観調整装置1の出力を、図中で
Air Jet Cooler(略称AJC)出力と表すことがある。
In the surface appearance adjustment device 1 of the present embodiment, the amount of air supplied from the gas supply means 6 to the gas injection means 5 is that of the air supply fan 30 corresponding to the power frequency input to the AC motor 29 of the gas supply means 6. It depends on the number of revolutions. 3 and 4 correspond to the rotation speed of the air supply fan 30 corresponding to the power frequency input to the AC motor 29 in the surface appearance adjustment device 1 of the present embodiment and the rotation speed of the air supply fan 30. The relationship with a device output is illustrated. FIG. 3 is a diagram showing the relationship between the power frequency of the AC motor 29 and the rotational speed of the air supply fan 30, and FIG. 4 is a diagram showing the relationship between the rotational frequency of the air supply fan 30 and the AJC output. In addition, since the surface appearance adjustment apparatus 1 sprays air on the hot-dip plated steel sheet 3a and cools it, the output of the surface appearance adjustment apparatus 1 is shown in the figure.
It may be expressed as Air Jet Cooler (abbreviation AJC) output.

図3中に示すライン41が、交流モータ29に入力される電力周波数と、交流モータ29によって回転駆動される送気ファン30の回転数との関係を示す。ライン41から判るように、交流モータ29に入力される電力周波数の増加に伴って、ほぼ直線的に送気ファン30の回転数が増加する。したがって、制御手段9からの動作指示信号によって、交流モータ29に入力される電力周波数を制御することによって、ガス噴射手段5へ供給する空気量、すなわち冷却能力を精度良く調整し、所望の値に設定することができる。図4中に示すライン42は、送気ファン30の回転数をAJC出力として表したものであり、AJC出力が90%付近までは、AJC出力と送気ファン回転数とがほぼ直線関係にあるので、送気ファン30の回転数、すなわち空気供給量である冷却能力をAJC出力値として表しても、精度良く冷却能力を表し得ることが判る。   A line 41 shown in FIG. 3 indicates the relationship between the power frequency input to the AC motor 29 and the rotational speed of the air supply fan 30 that is rotationally driven by the AC motor 29. As can be seen from the line 41, as the power frequency input to the AC motor 29 increases, the rotational speed of the air supply fan 30 increases almost linearly. Therefore, by controlling the power frequency input to the AC motor 29 by the operation instruction signal from the control means 9, the amount of air supplied to the gas injection means 5, that is, the cooling capacity is accurately adjusted to a desired value. Can be set. A line 42 shown in FIG. 4 represents the rotation speed of the air supply fan 30 as an AJC output. The AJC output and the air supply fan rotation speed are in a substantially linear relationship until the AJC output is near 90%. Therefore, it can be seen that even if the rotation speed of the air supply fan 30, that is, the cooling capacity that is the air supply amount is expressed as an AJC output value, the cooling capacity can be expressed with high accuracy.

この交流モータ29に入力される電力周波数と、送気ファン30の回転数ひいてはAJC出力との関係を与える能力データは、制御手段9のメモリに予めストアされており、制御手段9は、前述のように冷却速度偏差ΔVcが0になるように、交流モータ29に入力される電力周波数を制御する。このことによって、AJC出力、すなわちガス冷却手段10から溶融めっき鋼板3aに吹付ける空気量を精度良く所望の値に設定することができるので、溶融めっき鋼板3aの冷却速度Vcを精度良く所望の値になるように調整することが可能になる。   Capability data giving the relationship between the power frequency input to the AC motor 29 and the rotation speed of the air supply fan 30 and thus the AJC output is stored in advance in the memory of the control means 9. Thus, the power frequency input to AC motor 29 is controlled so that cooling rate deviation ΔVc becomes zero. As a result, the AJC output, that is, the amount of air blown from the gas cooling means 10 to the hot dip plated steel sheet 3a can be set to a desired value with high accuracy, and therefore the cooling rate Vc of the hot dip plated steel sheet 3a can be accurately set to the desired value. It becomes possible to adjust to become.

以下本発明の溶融めっき鋼板3aの表面外観調整方法について説明する。まず溶融めっき設備の巻戻装置から巻戻された鋼板3cは、前処理装置によって前処理された後、焼鈍炉11で活性化処理される。活性化処理された鋼板3cは、スナウト14を通過してめっき浴2に浸漬されてめっき処理される。めっき浴2から引上げられた溶融めっき鋼板3aは、ガスワイピングノズル13a,13bから吹付けられるガス圧力によってめっき付着量が調整される。   Hereinafter, the surface appearance adjustment method of the hot-dip galvanized steel sheet 3a of the present invention will be described. First, the steel plate 3c unwound from the unwinding device of the hot dipping equipment is pretreated by the pretreatment device and then activated in the annealing furnace 11. The activated steel plate 3c passes through the snout 14 and is immersed in the plating bath 2 to be plated. The coating amount of the hot-dip plated steel sheet 3a pulled up from the plating bath 2 is adjusted by the gas pressure blown from the gas wiping nozzles 13a and 13b.

めっき付着量調整後の溶融めっき鋼板3aは、表面外観調整装置1のガス噴射手段5内を搬送される過程において、ガス冷却手段10から空気が吹付けられ冷却されることによって表面外観が調整される。このとき、制御手段9は、前述のように第1温度検出手段4、第2温度検出手段7および搬送速度検出手段8の検出出力に応答し、目標冷却速度MVcと実測冷却速度Vcとの差である冷却速度偏差ΔVcが0になるように、AJC出力、すなわちガス冷却手段10による冷却能力を制御することによって、溶融めっき鋼板3aを所望の冷却速度で冷却し、表面外観を調整する。   The surface appearance of the galvanized steel sheet 3a after the adjustment of the coating amount is adjusted by blowing air from the gas cooling means 10 and cooling it in the process of being conveyed in the gas injection means 5 of the surface appearance adjusting device 1. The At this time, the control means 9 responds to the detection outputs of the first temperature detection means 4, the second temperature detection means 7 and the conveyance speed detection means 8 as described above, and the difference between the target cooling speed MVc and the actual measurement cooling speed Vc. By controlling the AJC output, that is, the cooling capacity by the gas cooling means 10, so that the cooling rate deviation ΔVc is 0, the hot-dip plated steel sheet 3a is cooled at a desired cooling rate, and the surface appearance is adjusted.

本発明では、表面外観のうち、主として表面光沢およびスパングル径を調整の対象とする。   In the present invention, of the surface appearance, the surface gloss and spangle diameter are mainly adjusted.

表面光沢が、冷却速度制御によって調整できる理由は、詳らかではないけれども、次のように推察される。溶融めっき鋼板が異なる冷却速度で冷却されるとき、めっき層表面の凝固収縮は冷却速度の影響を受ける。溶融めっき鋼板が急冷されるとき、めっき層表面は、ほぼ一様な状態で冷却されるので、凝固収縮に差異がほとんど無く、凹凸が小さいすなわち表面粗さが細かい表面状態になる。溶融めっき鋼板が徐冷されるとき、めっき層表面において、早期に凝固収縮するところと、遅れて凝固収縮するところとが発生し、凹凸が大きいすなわち表面粗さが粗い表面状態になる。特に合金めっきされた溶融めっき鋼板が徐冷される場合、凝固点の高い成分が早期に凝固し、凝固点の低い成分が遅れて凝固するので、凹凸が大きくなる傾向が顕著である。   The reason why the surface gloss can be adjusted by controlling the cooling rate is not clear, but is presumed as follows. When the hot dip plated steel sheet is cooled at different cooling rates, the solidification shrinkage of the plating layer surface is affected by the cooling rate. When the hot dip plated steel sheet is rapidly cooled, the surface of the plating layer is cooled in a substantially uniform state, so that there is almost no difference in solidification shrinkage, and the surface roughness is small, that is, the surface roughness is fine. When the galvanized steel sheet is slowly cooled, there are places where solidification shrinkage occurs early and places where the solidification shrinkage occurs later on the surface of the plating layer, resulting in a surface state with large irregularities, that is, rough surface roughness. In particular, when an alloy-plated hot-dip steel sheet is gradually cooled, a component with a high freezing point solidifies early, and a component with a low freezing point solidifies later, so that the tendency for unevenness to be large is remarkable.

めっき層表面の凹凸状態と表面光沢との関係は、次のように推察される。めっき層表面に凹凸が無く極めて平滑である場合、ほとんど正反射のみが生じるので表面光沢が高くなる。めっき層表面が極微細な凹凸を有する場合、正反射に加えて微細な凹凸で乱反射が生じ、乱反射光同士が干渉するので、表面光沢が低くなり、白っぽく見えるようになる。めっき層表面の凹凸がやや粗い場合、正反射に加えて凹凸で乱反射が生じるけれども、乱反射光の反射角度が正反射光の反射角度に近いものの割合が高くなり、表面光沢が高くなる。めっき層表面がさらに粗くなり凹凸が目視できる程度の大きさになると、乱反射光同士の干渉が再び大きくなり、表面光沢が低下する。   The relationship between the uneven state of the plating layer surface and the surface gloss is inferred as follows. When the surface of the plating layer has no irregularities and is extremely smooth, almost regular reflection only occurs, resulting in high surface gloss. When the surface of the plating layer has extremely fine irregularities, irregular reflection occurs due to fine irregularities in addition to regular reflection, and irregularly reflected light interferes with each other, resulting in low surface gloss and a whitish appearance. When the unevenness on the surface of the plating layer is slightly rough, irregular reflection occurs due to the unevenness in addition to regular reflection, but the ratio of the reflection angle of irregular reflection light is close to the reflection angle of regular reflection light, and the surface gloss is high. When the surface of the plating layer is further roughened and becomes a size that allows the irregularities to be visually observed, interference between the irregularly reflected light is increased again, and the surface gloss is lowered.

本発明の空気吹付けによる冷却では、冷却速度を急冷から徐冷まで幅広い範囲に調整することができるので、溶融めっき鋼板の表面状態を種々の大きさの凹凸状態に調整し、その表面光沢を広範囲にわたって調整することができる。   In the cooling by air blowing of the present invention, since the cooling rate can be adjusted in a wide range from rapid cooling to slow cooling, the surface state of the hot-dip plated steel sheet is adjusted to various sizes of unevenness, and the surface gloss is adjusted. It can be adjusted over a wide range.

またスパングルは、気水冷却であると、冷却速度が大きすぎるので、小さな径のもののみが形成され、凝固過程において強制冷却をしないと、前述のように組成によって定まる径のものが形成される。しかしながら、本発明の空気吹付け冷却によれば、冷却速度を急冷から徐冷まで幅広い範囲に調整することによって、凝固時におけるめっき金属のデンドライトの延びを調整することができるので、スパングル径の大きさを調整することが可能になる。   In addition, since the cooling rate is too high when the spangle is cooled by air and water, only a small diameter is formed. If forced cooling is not performed during the solidification process, a diameter determined by the composition is formed as described above. . However, according to the air blowing cooling of the present invention, the extension of the dendrite of the plated metal during solidification can be adjusted by adjusting the cooling rate in a wide range from rapid cooling to gradual cooling. It becomes possible to adjust the thickness.

なお、本発明の表面外観調整方法は、以上に述べたようなフィードバック制御に限定されるものではなく、次のようにダイレクト制御されても良い。   The surface appearance adjustment method of the present invention is not limited to the feedback control as described above, and may be directly controlled as follows.

ダイレクト制御は、たとえば表面外観調整装置1の熱収支式(4)〜(6)に基づいて行われる。製造対象とする溶融めっき鋼板毎に予め所望の冷却速度を定め、該冷却速度になるようなAJC出力、すなわち交流モータ29に入力される電力周波数を求め、求められる電力周波数に交流モータ29の動作条件を設定したうえで、溶融めっき鋼板3aを通板させて冷却を行う。
a×ρ×Cs×(T1−T2)=t×S×α×ΔT1,2 …(4)
ΔT1,2={(T1-TA)-(T2-TA)}/ln{(T1-TA)/(T2-TA)} …(5)
α={a×ρ×Cs×(T1−T2)}/(2×t×S×α×ΔT1,2
…(6)
ここで、a:板厚[m]
ρ:鋼板密度[kg/m
Cs:鋼板の比熱[kcal/kg・℃]
S:面積[m](表裏を考慮するので式(6)では2倍する)
t:鋼板のガス冷却手段を通過する時間[hr]
α:熱伝達係数[kcal/m・hr・℃]
TA:ガス噴射手段から噴射される空気の温度[℃]
ΔT1,2:平均温度差
The direct control is performed based on, for example, the heat balance equations (4) to (6) of the surface appearance adjustment device 1. A desired cooling rate is determined in advance for each hot-dip plated steel sheet to be manufactured, an AJC output that achieves the cooling rate, that is, a power frequency input to the AC motor 29 is obtained, and the operation of the AC motor 29 is performed at the required power frequency. After setting the conditions, the hot dip plated steel sheet 3a is passed through and cooled.
a × ρ × Cs × (T1−T2) = t × S × α × ΔT 1,2 (4)
ΔT 1,2 = {(T1-TA)-(T2-TA)} / ln {(T1-TA) / (T2-TA)} ... (5)
α = {a × ρ × Cs × (T1-T2)} / (2 × t × S × α × ΔT 1,2 )
(6)
Where a: thickness [m]
ρ: Steel sheet density [kg / m 3 ]
Cs: Specific heat of steel plate [kcal / kg · ° C]
S: Area [m 2 ] (Because the front and back sides are taken into account, double in equation (6))
t: Time to pass through the gas cooling means of the steel plate [hr]
α: Heat transfer coefficient [kcal / m 2 · hr · ° C]
TA: temperature of air injected from the gas injection means [° C.]
ΔT 1,2 : Average temperature difference

本発明で表面外観調整の対象とする溶融めっき鋼板に用いられる素鋼板には、種々の組成のものがあるけれども、その鋼板密度ρは、ほぼ同一の7850kg/mであり、その比熱Csもほぼ同一の0.114kcal/kg・℃である。また前述のように溶融めっき設備に設けられる表面外観調整装置1が定まると、ガス噴射手段5の長さLが定まり、搬送速度Vが各鋼板毎の製造標準から定まるので、鋼板のガス噴射手段5を通過する時間tが求められる。またガス噴射手段5から噴射される空気の温度TAは、たとえば夏場は40℃などのように季節毎の固定値を用いても良く、または大気温度に装置固有の補正係数を乗じた値を用いても良い。 In the present invention, there are various steel compositions used for the hot dip plated steel sheet whose surface appearance is to be adjusted. However, the density ρ of the steel sheet is approximately the same 7850 kg / m 3 , and the specific heat Cs is also the same. Almost the same 0.114 kcal / kg · ° C. When the surface appearance adjusting device 1 provided in the hot dipping equipment is determined as described above, the length L of the gas injection means 5 is determined, and the conveying speed V is determined from the production standard for each steel plate. Time t passing through 5 is obtained. The temperature TA of the air injected from the gas injection means 5 may be a fixed value for each season, such as 40 ° C. in summer, or a value obtained by multiplying the atmospheric temperature by a correction coefficient unique to the apparatus. May be.

ガス噴射手段5の入側温度であるめっき浴2の温度T1は、めっき浴2の組成によって定まり、鋼板の搬送速度Vは製造標準から定まるので、ガス噴射手段5の出側温度T2の設定に応じて冷却速度が定まる。   The temperature T1 of the plating bath 2, which is the inlet side temperature of the gas injection means 5, is determined by the composition of the plating bath 2, and the conveying speed V of the steel sheet is determined from the production standard. Therefore, the outlet temperature T2 of the gas injection means 5 is set. The cooling rate is determined accordingly.

したがって、固定した数値として得られる表1に示すデータと、製造する溶融めっき鋼板に応じて定められるデータである鋼板の板厚a、熱伝達係数α、ガス噴射手段5の入側温度T1、ガス噴射手段5の出側温度T2および搬送速度Vとを用いて、冷却速度とAJC出力との関係を、予めシミュレーションして求めておくことができる。なお、熱収支式における他の因子である鋼板の面積Sは、製造する溶融めっき鋼板に応じて定まる鋼板の板幅とガス噴射手段5の長さLとから得られ、鋼板のガス冷却手段10を通過する時間tは、搬送速度Vとガス噴射手段5の長さLとから得られる。   Therefore, the data shown in Table 1 obtained as fixed numerical values and the steel sheet thickness a, the heat transfer coefficient α, the inlet temperature T1 of the gas injection means 5 and the gas, which are data determined according to the hot-dip plated steel sheet to be manufactured. The relationship between the cooling rate and the AJC output can be obtained by simulation in advance using the outlet side temperature T2 and the conveyance speed V of the injection unit 5. In addition, the area S of the steel plate, which is another factor in the heat balance equation, is obtained from the plate width of the steel plate determined according to the hot dip plated steel plate and the length L of the gas injection means 5, and the gas cooling means 10 for the steel plate. The time t passing through is obtained from the conveyance speed V and the length L of the gas injection means 5.

このシミュレーション結果に基づき、ガス噴射手段5から噴射される空気温度TAを考慮したうえで、鋼板の板厚aと鋼板がガス噴射手段5を通過する時間tとの積(=a・t)と、AJC出力との関係が得られるテーブルデータを作成する。作成したテーブルデータの一例を図5に示す。この図5に例示するようなa・tとAJC出力とのテーブルデータに基づいて、溶融めっき鋼板3aが所望の冷却速度になるようにAJC出力、すなわち交流モータ29に入力される電力周波数を求め、該電力周波数で交流モータ29が動作するようにダイレクト制御し、溶融めっき鋼板3aを通板させて冷却速度をコントロールする。   Based on the simulation results, the air temperature TA injected from the gas injection means 5 is taken into consideration, and the product (= a · t) of the sheet thickness a and the time t during which the steel sheet passes through the gas injection means 5 Table data that can be related to the AJC output is created. An example of the created table data is shown in FIG. Based on the table data of at and the AJC output as illustrated in FIG. 5, the AJC output, that is, the power frequency input to the AC motor 29 is obtained so that the hot-dip plated steel sheet 3a has a desired cooling rate. The AC motor 29 is directly controlled to operate at the power frequency, and the cooling rate is controlled by passing the hot-dip plated steel sheet 3a.

Figure 2005256050
Figure 2005256050

以下本発明の実施例について説明する。図1に示す溶融めっき設備および表面外観調整装置1を用い、前述のフィードフォワード制御によって溶融めっき鋼板の冷却速度を調整し、その表面光沢およびスパングル径を調整する試験を実施した。   Examples of the present invention will be described below. Using the hot dipping equipment and the surface appearance adjusting device 1 shown in FIG. 1, a test for adjusting the cooling rate of the hot dipped steel sheet by the above-described feedforward control and adjusting the surface gloss and spangle diameter was performed.

溶融めっきの素鋼板には、板厚:0.8mm、板幅:910mmの日本工業規格(JIS)G3302−87に規定される構造用鋼を用いた。素鋼板に対する溶融めっきは、めっき金属にZn合金を用い、付着量150g/mにて行った。めっき浴の設定温度T1=460℃、鋼板の設定搬送速度V=7200m/hr(=120m/min)とし、AJC出力を15〜90%(送気ファン回転数で、140〜1055rpm)の範囲で変化させて、ガス冷却手段5の出側温度T2、すなわち冷却速度が種々に異なる溶融Zn合金系めっき鋼板を作製した。冷却速度が異なるようにして作製された溶融Zn合金系めっき鋼板について、表面光沢、表面粗さおよびスパングル径を測定した。 As the hot-dip plated steel sheet, structural steel specified in Japanese Industrial Standard (JIS) G3302-87 having a thickness of 0.8 mm and a width of 910 mm was used. The hot dip plating on the base steel plate was performed using a Zn alloy as the plating metal at an adhesion amount of 150 g / m 2 . The plating bath set temperature T1 = 460 ° C., the steel plate set transport speed V = 7200 m / hr (= 120 m / min), and the AJC output is 15 to 90% (at the air supply fan speed, 140 to 1055 rpm). By changing, the outlet side temperature T2 of the gas cooling means 5, that is, the hot-dip Zn alloy-based plated steel sheet with different cooling rates was produced. The surface gloss, the surface roughness, and the spangle diameter were measured for the hot-dip Zn alloy-based plated steel sheets produced with different cooling rates.

表面光沢は、色差計SM−7CH(商品名;スガ試験機株式会社製)を用いて明度差を測定し、光沢度指標としてL値にて評価した。L値が大きい程、光沢度が高いと評価した。   The surface gloss was evaluated by the L value as a glossiness index by measuring the brightness difference using a color difference meter SM-7CH (trade name; manufactured by Suga Test Instruments Co., Ltd.). The larger the L value, the higher the glossiness.

表面粗さは、表面粗さ計フォームタリサーフシリーズ2(商品名;テーラーホブソン社製)を用いて測定し、JIS−B0601に規定される中心線平均粗さRaにて、表面粗さを評価した。Raが大きい程、表面が粗いと評価した。   The surface roughness is measured using a surface roughness meter Foam Talysurf Series 2 (trade name; manufactured by Taylor Hobson), and the surface roughness is evaluated by the center line average roughness Ra defined in JIS-B0601. did. It was evaluated that the larger the Ra, the rougher the surface.

スパングル径は、顕微鏡観察によって目視でその大きさを測定した。本実施例では、便宜上、スパングル径が、10mm以上を「大」、8mm前後を「中」、5mm以下を「小」として分類した。   The spangle diameter was measured visually by microscopic observation. In this embodiment, for convenience, the spangle diameter is classified as “large” when the diameter is 10 mm or more, “medium” when around 8 mm, and “small” when it is 5 mm or less.

図6は、AJC出力とL値との関係を示す図である。図6に示すように、AJC出力が大きくなるのに伴って、光沢度指標であるL値が低下する。すなわち冷却速度が大きくなるのに伴って光沢度が低下し、目視観察では、溶融Zn合金系めっき鋼板の表面が、光輝く状態から、白っぽく見える状態へと推移する。   FIG. 6 is a diagram illustrating the relationship between the AJC output and the L value. As shown in FIG. 6, as the AJC output increases, the L value, which is a glossiness index, decreases. That is, as the cooling rate increases, the glossiness decreases, and the surface of the hot-dip Zn alloy-based plated steel sheet changes from a shining state to a whitish state by visual observation.

図7はAJC出力が30%における表面粗さ測定データを示す図であり、図8はAJC出力が60%における表面粗さ測定データを示す図である。図7に示すチャートが、AJC出力30%で冷却された溶融Zn合金系めっき鋼板の表面粗さを測定した結果である。L方向は、鋼板の搬送方向に平行に触針を走査した測定データを示し、C方向は、鋼板の搬送方向に垂直な幅方向に触針を走査した測定データである。その中心線平均粗さRaは、L方向が1.02μm、C方向が0.87μmであった。   FIG. 7 is a diagram showing surface roughness measurement data when the AJC output is 30%, and FIG. 8 is a diagram showing surface roughness measurement data when the AJC output is 60%. The chart shown in FIG. 7 is the result of measuring the surface roughness of a hot-dip Zn alloy-based plated steel sheet cooled at an AJC output of 30%. The L direction indicates measurement data obtained by scanning the stylus in parallel with the steel plate conveyance direction, and the C direction is measurement data obtained by scanning the stylus in the width direction perpendicular to the steel plate conveyance direction. The center line average roughness Ra was 1.02 μm in the L direction and 0.87 μm in the C direction.

一方、図8に示すチャートが、AJC出力60%で冷却された溶融Zn合金系めっき鋼板の表面粗さを測定した結果である。その中心線平均粗さRaは、L方向が0.56μm、C方向が0.33μmであった。図6〜図8から判るように、AJC出力が高く、冷却速度の速い方が、表面粗さが細かくなり、表面光沢が低下する傾向を示し、AJC出力の調整によって広範囲の光沢度に調整することができた。   On the other hand, the chart shown in FIG. 8 is a result of measuring the surface roughness of a hot-dip Zn alloy-plated steel sheet cooled at an AJC output of 60%. The center line average roughness Ra was 0.56 μm in the L direction and 0.33 μm in the C direction. As can be seen from FIGS. 6 to 8, the higher the AJC output and the faster the cooling rate, the smaller the surface roughness and the lower the surface gloss, and the glossiness is adjusted to a wide range by adjusting the AJC output. I was able to.

図9は、AJC出力とスパングル径との関係を示す図である。スパングル径は、AJC出力15%で大、AJC出力50%で中、AJC出力90%で小であった。このように、AJC出力を調整し、冷却速度を制御することによって、同一組成のめっきを行う場合であっても、スパングル径を大〜小まで調整することができた。   FIG. 9 is a diagram illustrating the relationship between the AJC output and the spangle diameter. The spangle diameter was large at an AJC output of 15%, medium at an AJC output of 50%, and small at an AJC output of 90%. Thus, by adjusting the AJC output and controlling the cooling rate, it was possible to adjust the spangle diameter from large to small even when plating with the same composition was performed.

本発明の実施の一形態である溶融めっき鋼板の表面外観調整装置1の構成を簡略化して示す図である。It is a figure which simplifies and shows the structure of the surface appearance adjustment apparatus 1 of the hot dip plated steel plate which is one Embodiment of this invention. ガス噴射手段5の構成を簡略化して示す図である。It is a figure which simplifies and shows the structure of the gas injection means. 交流モータ29の電力周波数と送気ファン30の回転数との関係を示す図である。It is a figure which shows the relationship between the electric power frequency of AC motor 29, and the rotation speed of the air supply fan 30. FIG. 送気ファン30の回転数とAJC出力との関係を示す図である。It is a figure which shows the relationship between the rotation speed of the air supply fan 30, and an AJC output. a・tとAJC出力との関係が得られるテーブルデータを例示する図である。It is a figure which illustrates the table data from which the relationship between a * t and an AJC output is obtained. AJC出力とL値との関係を示す図である。It is a figure which shows the relationship between an AJC output and L value. AJC出力が30%における表面粗さ測定データを示す図である。It is a figure which shows the surface roughness measurement data in AJC output 30%. AJC出力が60%における表面粗さ測定データを示す図である。It is a figure which shows the surface roughness measurement data in AJC output 60%. AJC出力とスパングル径との関係を示す図である。It is a figure which shows the relationship between an AJC output and a spangle diameter.

符号の説明Explanation of symbols

1 表面外観調整装置
2 めっき浴
3a,3b 溶融めっき鋼板
3c 鋼板
4 第1温度検出手段
5 ガス噴射手段
6 ガス供給手段
7 第2温度検出手段
8 搬送速度検出手段
9 制御手段
10 ガス冷却手段
11 焼鈍炉
12 ポット
13a,13b ガスワイピングノズル
14 スナウト
15 シンクロール
22 スリット
24 第1供給口
25 第2供給口
26 第1送気ダクト
27 第2送気ダクト
29 交流モータ
30 送気ファン
DESCRIPTION OF SYMBOLS 1 Surface appearance adjustment apparatus 2 Plating bath 3a, 3b Hot dipped steel plate 3c Steel plate 4 1st temperature detection means 5 Gas injection means 6 Gas supply means 7 2nd temperature detection means 8 Conveyance speed detection means 9 Control means 10 Gas cooling means 11 Annealing Furnace 12 Pot 13a, 13b Gas wiping nozzle 14 Snout 15 Sink roll 22 Slit 24 First supply port 25 Second supply port 26 First air supply duct 27 Second air supply duct 29 AC motor 30 Air supply fan

Claims (4)

めっき浴に鋼板を浸漬してめっき処理を施し、
めっき処理された溶融めっき鋼板のめっき付着量を調整し、
溶融めっき鋼板の表面にガスを吹付けて冷却するガス冷却手段であって、冷却能力の調整が可能なガス冷却手段を用いて、めっき付着量調整後の溶融めっき鋼板を冷却し、
溶融めっき鋼板の冷却時に溶融めっき鋼板の冷却速度を調整することによって表面外観を調整することを特徴とする溶融めっき鋼板の表面外観調整方法。
Immerse the steel plate in the plating bath and apply plating treatment.
Adjust the plating adhesion amount of the plated hot-dip plated steel sheet,
A gas cooling means for spraying and cooling gas on the surface of the hot dip plated steel sheet, using the gas cooling means capable of adjusting the cooling capacity, cooling the hot dip plated steel sheet after adjusting the coating amount,
A method for adjusting the surface appearance of a hot-dip galvanized steel sheet, comprising adjusting a surface appearance by adjusting a cooling rate of the hot-dip galvanized steel sheet during cooling of the hot dip galvanized steel sheet.
溶融めっき鋼板の冷却速度の調整は、
ガス冷却手段から溶融めっき鋼板に吹付けるガスの量を調整することによって行われることを特徴とする請求項1記載の溶融めっき鋼板の表面外観調整方法。
Adjustment of the cooling rate of hot dip galvanized steel sheet
The method for adjusting the surface appearance of a hot-dip plated steel sheet according to claim 1, wherein the method is performed by adjusting the amount of gas sprayed from the gas cooling means to the hot-dip hot-dip steel sheet.
溶融めっき鋼板の表面外観は、表面光沢および/またはスパングル径であることを特徴とする請求項1または2記載の溶融めっき鋼板の表面外観調整方法。   The surface appearance adjustment method of the hot-dip plated steel sheet according to claim 1 or 2, wherein the surface appearance of the hot-dip steel sheet is surface gloss and / or spangle diameter. 搬送途中でめっき浴に浸漬されてめっき処理が施される溶融めっき鋼板のめっき処理後の冷却速度を調整することによって、その表面外観を調整する溶融めっき鋼板の表面外観調整装置において、
めっき浴に浸漬後の溶融めっき鋼板であって表面外観が調整される前の溶融めっき鋼板の温度を検出する第1温度検出手段と、
めっき浴に浸漬後の溶融めっき鋼板に対してガスを吹付けて冷却するガス噴射手段と、
ガス噴射手段にガスを供給するガス供給手段と、
ガス噴射手段によってガスが吹付けられて冷却された溶融めっき鋼板の温度を検出する第2温度検出手段と、
溶融めっき鋼板の搬送速度を検出する搬送速度検出手段と、
第1温度検出手段、第2温度検出手段および搬送速度検出手段の検出出力に応答し、ガス供給手段によるガス供給量を制御する制御手段とを含むことを特徴とする溶融めっき鋼板の表面外観調整装置。
In the surface appearance adjustment device for the hot-dip plated steel sheet, which adjusts the surface appearance by adjusting the cooling rate after the plating treatment of the hot-dip plated steel sheet, which is immersed in the plating bath in the middle of conveyance and subjected to the plating process,
First temperature detecting means for detecting the temperature of the hot-dip plated steel sheet after being immersed in the plating bath and before the surface appearance is adjusted;
A gas injection means for cooling the hot-dip plated steel sheet after being immersed in the plating bath by spraying a gas;
Gas supply means for supplying gas to the gas injection means;
A second temperature detecting means for detecting the temperature of the hot-dip plated steel sheet cooled by the gas spraying means;
A transport speed detecting means for detecting the transport speed of the hot dip plated steel sheet,
A surface appearance adjustment of a hot-dip galvanized steel sheet, comprising: a control means for controlling a gas supply amount by the gas supply means in response to detection outputs of the first temperature detection means, the second temperature detection means and the conveyance speed detection means apparatus.
JP2004067405A 2004-03-10 2004-03-10 Surface appearance adjustment method and surface appearance adjustment device for hot dip plated steel sheet Expired - Fee Related JP4468718B2 (en)

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