WO2013164493A1 - Device for reducing the thickness of a metallic coating on a metallic sheet - Google Patents

Device for reducing the thickness of a metallic coating on a metallic sheet Download PDF

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Publication number
WO2013164493A1
WO2013164493A1 PCT/ES2012/070299 ES2012070299W WO2013164493A1 WO 2013164493 A1 WO2013164493 A1 WO 2013164493A1 ES 2012070299 W ES2012070299 W ES 2012070299W WO 2013164493 A1 WO2013164493 A1 WO 2013164493A1
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WO
WIPO (PCT)
Prior art keywords
sheet
coating
metal
cutting edge
thickness
Prior art date
Application number
PCT/ES2012/070299
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Spanish (es)
French (fr)
Inventor
Marcello BECHERINI
Original Assignee
Eurostradale, S.L.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eurostradale, S.L. filed Critical Eurostradale, S.L.
Priority to PCT/ES2012/070299 priority Critical patent/WO2013164493A1/en
Publication of WO2013164493A1 publication Critical patent/WO2013164493A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/22—Removing excess of molten coatings; Controlling or regulating the coating thickness by rubbing, e.g. using knives, e.g. rubbing solids

Definitions

  • the invention refers to a device for achieving a low or very low metal coating thickness on a metal sheet that existing technology cannot achieve.
  • it refers to a device or apparatus intended to be used in a metal and / or galvanized coating line, in order to reduce the amount of coating metal (generally zinc, aluminum or a metal alloy) applied on a sheet of metal (usually steel) and allowing to eliminate the excess of said metallic coating, increase the production speed, improve the surface finish and improve the working environment conditions due to the total absence of noise.
  • coating metal generally zinc, aluminum or a metal alloy
  • the metallic coating consists of the application of a molten metal, generally Zinc (Zn), Aluminum (Al) or an alloy of metals such as Zinc and Aluminum; Zinc, Aluminum and Silicon (Si); Aluminum and Silicon, etc., by deposition on a metallic substrate (usually of steel).
  • a molten metal generally Zinc (Zn), Aluminum (Al) or an alloy of metals such as Zinc and Aluminum; Zinc, Aluminum and Silicon (Si); Aluminum and Silicon, etc.
  • the metallic coating allows to obtain metallic products with a greater resistance to corrosion and improved qualities with respect to the base metal giving it greater durability, solidity and an improved aesthetic.
  • the metallic coating is done by various technologies, which we can group into three broad categories:
  • Electrocincado consisting of cold coating the metal substrate by electrolytic deposition.
  • Vacuum deposition coating consisting of coating the metal substrate by vacuum techniques.
  • hot dip coating technology we find:
  • Continuous coating when the immersion coating of the metallic substrate is carried out by means of a continuous process (eg a continuous band, strap, coil, cable, wire, etc., of metal that is passed through the molten metal bath through of rollers).
  • a continuous process eg a continuous band, strap, coil, cable, wire, etc., of metal that is passed through the molten metal bath through of rollers.
  • the present invention is part of the continuous hot-dip metal coating technology.
  • the lines of metallic and / or galvanized coating are known in which a continuous sheet or cable of a metallic material is covered by a layer of molten metal after passing through a bathtub or tub which contains said metal.
  • the sheet already covered with molten metal leaves the bathtub vertically and then the thickness of the coating, or weight of the metal coating is regulated per square meter of sheet, by means of devices that apply a gas under pressure on both sides of the sheet.
  • the most commonly used system is known as "air knives" or air ejectors. These devices do not allow to apply coatings below 80 gr / m 2 or reach production speeds greater than 150 linear meters / min for this coating.
  • the objective of the present invention is a new system for reducing the thickness and / or weight of the coating applied on a metal sheet overcoming the problems existing in the state of the art by means of a device that allows:
  • the invention proposes, as already noted above, a device for reducing the thickness of coating on a metal sheet.
  • Said device is not a substitute for traditional methods, such as air ejectors, but complementary to them, preferably being arranged at the exit of the metal coating line to act on the sheet after the air / gas ejectors.
  • Said device comprises at least one cutting edge, preferably an elongated and small thickness element, as a thread, string, rope, wire or cable, which tensioning comes into contact with the coating of a metal sheet for, by said contact, reduce the thickness of the molten metal that covers said metal sheet.
  • the metal sheet at its exit from the bath where the molten metal is located has a coating with a thickness determined by the conditions of the molten metal, the sheet metal and the production speed.
  • This coating often has an excessive thickness of molten material and is not uniform or constant along the surface of the sheet. Therefore, in order to remove the excess of molten material disposed on the sheet and achieve a constant thickness, as well as to achieve a uniform surface, the device object of the present invention, preferably a device to each bath, is disposed at the outlet of the bath side of the blade in its ascending path.
  • the device comprises at least one cutting edge, the elongated and small thickness element, as a thread or rope, which is arranged tensioned on a rigid support and which is an element that will allow, when entering contact with the molten metal of the sheet, remove excess molten material depending on the requirements of the final sheet.
  • the length of the cutting edge and therefore of the rigid support is at least equal to the width of the coated sheet whose thickness is necessary to reduce or adjust.
  • the rotary structure is anchored to a head by each of its ends.
  • the heads support the entire structure and have a mechanism for vertical displacement of the same, that fulfills a double function: on the one hand it is the anchoring element of the structure to the bench (so that they guarantee the stability and positioning of the heads and, therefore, of the cutting edge, parallel to the sheet metal during the manufacturing process of the coated sheet) and, on the other hand, allow controlling the height at which the cutting edge is arranged, depending on the programmed production speed.
  • the heads also have an adjustment mechanism, which allows to regulate the distance between the cutting edge and the metal sheet, depending on the thickness of the desired coating.
  • a device for being located on one side of the sheet has been described, but for the resulting sheet to obtain a symmetrical coating, an equivalent device is provided on the opposite side.
  • both devices are arranged on the same bench and the distance between the cutting edges and the blade is regulated by the same means of translation.
  • the cutting edge, or elongated element has a thickness of at least 0.5 to 3.0 cm, preferably between 0.8 cm and 1.5 cm, and is made of a material capable of withstanding high temperatures, at least The temperature of the molten metal when leaving the bathtub, such as a synthetic, natural or ceramic fiber (for example, kevlar coated with wax, ceramics, etc.), and its section, preferably square, can also be circular, triangular or rectangular , among other. Also, the material has to be slightly elastic to avoid deformation and tensile strength. Said cutting edge is attached to the rigid support by known fastening means, preferably under pressure.
  • Figures 1 and 2 show two perspective views of two embodiments of a device (A) according to the object of the present invention arranged in a metal coating line at the exit of a bathtub (10).
  • Figure number 3 shows a side view of a preferred embodiment of the device object of the present invention, in which rigid supports (13) and their respective cutting edges (6) arranged on a rotating structure (14) are observed.
  • Figure 4 shows a schematic and enlarged representation of the Simultaneous operation of two metal coating thickness reduction devices acting on a metal sheet, located symmetrically on both sides of the metal sheet (2), so that the cutting edges (6) are held and tensioned on the rigid supports (13 bis), when they come into contact with the metal coating of the sheet (2 ' ), they simultaneously remove excess molten metal (7) from both sides of the sheet (2 ' ).
  • the device (A) for reducing the coating thickness on a sheet of continuous metal (2) is placed at the exit of a bathtub (10) containing molten metal (11) at a temperature of approximately 450 ° C, so that when the continuous sheet of metal (2) passes through said bathtub (10) and is driven vertically therefrom by the skin roll or cylinder (1) presenting said protruding metal sheet 2 ' on its two side faces or sides, an excess of metallic coating (7) that needs to be partially removed.
  • At least one device (A) object of the present invention is disposed at the exit of said bathtub (10).
  • the device (A) comprises at least one cutting edge (6) that comes into contact with the coating of the sheet (2 ' ) to remove the excess of molten metal (7), dropping the excess of molten metal detached (7) back to the bathtub (10).
  • Said cutting edge (6) is a wire, rope, string, wire or cable, in short, an elongated and reduced thickness element, preferably with a square section, of a material that resists temperatures equal to at least the metal outlet temperature. bath fade (10) and tensile resistant
  • the material is preferably Keviar, and more preferably Keviar coated with wax.
  • Said cutting edge (6) is arranged tensioned on a rigid support (13) of a length at least equal to the width of the sides of the metal sheet 2 ' , located parallel to the metal sheet (2 ' ), and which is attached to a rotating structure (14).
  • the rotary structure (14) fits in heads (9) located at its ends that have a vertical movement mechanism (4) that acts as a support and allows the anchorage of the whole device (A) to the bed of the line of metallic coating, as well as the regulation of the height of the cutting edge (6) depending on the desired production speed.
  • Said heads (9) have, in turn, an adjustment mechanism (8) that allows the cutting edge (6) of the metal sheet (2 ' ) to be zoomed in or out, in order to regulate the desired coating thickness.
  • said vertical movement mechanisms (4) and the adjustment mechanisms to move the cutting edge (6) away from the sheet 2 ' are dispensed with.
  • the heads (9), are provided with a joint for circular movement, allowing the rotating structure (14) to be rotated so that, by having several rigid supports (13) therein with their corresponding cutting edges (6), when a cutting edge (6) is worn or broken, this first edge (6) is replaced by a second cutting edge (6), and while working this second cutting edge (6) the first edge ( 6) of the rigid support (13), avoiding stops in the production line.
  • the assembly formed by the heads (9), the rotary structure (14), the rigid supports (13) and cutting edges (6) of the device (A) is supported by means of the vertical movement mechanism (4) on a bench firmly fixed but isolated from possible vibrations to avoid that the cutting edge (6) is affected during its work by external causes, and also affects the coating of the sheet (2).
  • the device object of the invention (A) is located in front of another identical device (A) located on both sides of the steel sheet (2 ' ) whose coating is to be reduced, so that they simultaneously eliminate excess molten metal (7) on both sides of the sheet (2 ' ).
  • the cutting edges (6) of two devices (A) that work together are facing each other and have rotational structures (14) and symmetrical heads (9). They can also share the bed so that the adjustment mechanism (8) is common to both, allowing the approach or distance of both cutting edges (6) at the same time thus ensuring the symmetry of the steel sheet (2 ") ) coated.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)

Abstract

Device for reducing the thickness of a metallic coating on a metallic sheet, designed for use in a continuous metal-coating line, at the exit from a bath (10) containing a molten metal (11) for coating the sheet (2), in order to reduce the amount of coating metal applied to said metal sheet (2), which comprises at least one cutting wire (6), located on a rigid supporting member (13) and to one side of the metal sheet (2), said supporting member (13) keeping the cutting wire (6) under tension and parallel to the metal sheet (2) in such a manner that said cutting wire (6), when it enters into contact with the sheet coating, removes the excess coating molten metal (7), which is returned to the bath (10). The rigid supporting member (13) is located on a rotary structure (14) arranged on heads (9) located at both ends of said structure (14) and resting on a bench.

Description

DISPOSITIVO PARA REDUCIR EL ESPESOR DE RECUBRIMIENTO METÁLICO DEVICE FOR REDUCING THE METAL COATING THICKNESS
SOBRE UNA LAMINA METÁLICA ON A METAL SHEET
OBJETO DE LA INVENCIÓN OBJECT OF THE INVENTION
La invención, dispositivo para reducir el espesor de recubrimiento metálico sobre una lámina metálica, se refiere a un dispositivo para conseguir un espesor de recubrimiento metálico bajo o muy bajo sobre una lámina metálica que la tecnología existente no puede conseguir. En particular, se refiere a un dispositivo o aparato destinado a utilizarse en una línea de recubrimiento metálico y/o de galvanizado, al objeto de reducir la cantidad de metal de recubrimiento (generalmente zinc, aluminio o una aleación de metales) aplicado sobre una lamina de metal (habitualmente acero) y permitiendo eliminar el exceso de dicho recubrimiento metálico, aumentar la velocidad de producción, mejorar el acabado superficial y mejorar las condiciones del ambiente de trabajo por la total ausencia de ruido. The invention, a device for reducing the thickness of metal coating on a metal sheet, refers to a device for achieving a low or very low metal coating thickness on a metal sheet that existing technology cannot achieve. In particular, it refers to a device or apparatus intended to be used in a metal and / or galvanized coating line, in order to reduce the amount of coating metal (generally zinc, aluminum or a metal alloy) applied on a sheet of metal (usually steel) and allowing to eliminate the excess of said metallic coating, increase the production speed, improve the surface finish and improve the working environment conditions due to the total absence of noise.
El campo de aplicación de la presente invención se enmarca dentro del sector técnico de la industria del recubrimiento metálico y del galvanizado en continuo  The scope of the present invention falls within the technical sector of the metal coating and continuous galvanizing industry
ANTECEDENTES DE LA INVENCIÓN BACKGROUND OF THE INVENTION
El recubrimiento metálico consiste en la aplicación de un metal fundido, generalmente Zinc (Zn), Aluminio (Al) o una aleación de metales tales como Zinc y Aluminio; Zinc, Aluminio y Silicio (Si); Aluminio y Silicio, etc., por deposición sobre un sustrato metálico (generalmente de acero). El recubrimiento metálico permite la obtención de productos metálicos con una mayor resistencia a la corrosión y cualidades mejoradas respecto al metal base otorgándole mayor durabilidad, solidez y una estética mejorada.  The metallic coating consists of the application of a molten metal, generally Zinc (Zn), Aluminum (Al) or an alloy of metals such as Zinc and Aluminum; Zinc, Aluminum and Silicon (Si); Aluminum and Silicon, etc., by deposition on a metallic substrate (usually of steel). The metallic coating allows to obtain metallic products with a greater resistance to corrosion and improved qualities with respect to the base metal giving it greater durability, solidity and an improved aesthetic.
El recubrimiento metálico se realiza mediante diversas tecnologías, que podemos agrupar en tres grandes categorías:  The metallic coating is done by various technologies, which we can group into three broad categories:
- Recubrimiento por inmersión en caliente, consistente en sumergir el sustrato metálico en un baño de metal fundido.  - Hot dip coating, consisting of submerging the metal substrate in a molten metal bath.
Electrocincado, consistente en recubrir en frío el sustrato metálico mediante deposición electrolítica.  Electrocincado, consisting of cold coating the metal substrate by electrolytic deposition.
Recubrimiento por deposición al vacio, consistente en recubrir el sustrato metá- lico mediante técnicas de vacío. A su vez, dentro de la tecnología de recubrimiento por inmersión en caliente nos encontramos con: Vacuum deposition coating, consisting of coating the metal substrate by vacuum techniques. In turn, within the hot dip coating technology we find:
Recubrimiento en continuo: cuando el recubrimiento por inmersión del sustrato metálico se realiza mediante un proceso en continuo (Pej. una banda continua, fleje, bobina, cable, alambre, etc. de metal que se hace transitar por el baño de metal fundido por medio de rodillos).  Continuous coating: when the immersion coating of the metallic substrate is carried out by means of a continuous process (eg a continuous band, strap, coil, cable, wire, etc., of metal that is passed through the molten metal bath through of rollers).
Recubrimiento no en continuo.  Coating not in continuous.
La presente invención se enmarca dentro de la tecnología de recubrimiento metálico en continuo por inmersión en caliente. Como se ha mencionado, en el estado de la técnica son conocidas las líneas de recubrimiento metálico y/o galvanizado en las que una lámina continua o cable de un material metálico es recubierta por una capa de metal fundido tras su paso por una bañera o cuba que contiene dicho metal. La lámina ya recubierta de metal fundido sale verticalmente de la bañera y a continuación se regula el espesor del recubrimiento, o peso del recubrimiento metálico por metro cuadrado de lámina, mediante dispositivos que aplican un gas a presión sobre ambos lados de la lámina. El sistema empleado más habitualmente es conocido con el nombre de "air-knives" o eyectores de aire. Estos dispositivos no permiten aplicar recubrimientos inferiores a 80 gr/m2 ni alcanzar velocidades de producción superiores a 150 metros lineales/min para este recubrimiento. The present invention is part of the continuous hot-dip metal coating technology. As mentioned, in the prior art the lines of metallic and / or galvanized coating are known in which a continuous sheet or cable of a metallic material is covered by a layer of molten metal after passing through a bathtub or tub which contains said metal. The sheet already covered with molten metal leaves the bathtub vertically and then the thickness of the coating, or weight of the metal coating is regulated per square meter of sheet, by means of devices that apply a gas under pressure on both sides of the sheet. The most commonly used system is known as "air knives" or air ejectors. These devices do not allow to apply coatings below 80 gr / m 2 or reach production speeds greater than 150 linear meters / min for this coating.
Por lo tanto, el objetivo de la presente invención es un nuevo sistema de reducción del espesor y/o peso del recubrimiento aplicado sobre una lamina metálica superando los problemas existentes en el estado de la técnica mediante un dispositivo que permita:  Therefore, the objective of the present invention is a new system for reducing the thickness and / or weight of the coating applied on a metal sheet overcoming the problems existing in the state of the art by means of a device that allows:
1) Obtener un recubrimiento metálico muy bajo entre 35 y 70gr/m2 en total sobre la lámina metálica. 1) Obtain a very low metallic coating between 35 and 70gr / m 2 in total on the metal sheet.
2) Obtener una velocidad de producción de hasta 250 metros lineales/min. 2) Obtain a production speed of up to 250 linear meters / min.
3) Ahorro del metal fundido para la cobertura al posibilitar aplicar menores capas de recubrimiento en función de las necesidades y no de las limitaciones del proceso de fabricación. 3) Saving of molten metal for coverage by making it possible to apply smaller layers of coating depending on the needs and not the limitations of the manufacturing process.
4) Obtener superficies uniformes constantes a lo largo de la lámina y en general una mejora del acabado superficial.  4) Obtain constant uniform surfaces throughout the sheet and in general an improvement of the surface finish.
5) Eliminar las vibraciones y oscilaciones habituales de la lámina metálica a su salida de la bañera cuando se procesan láminas con espesores bajos, haciendo innecesario el empleo de los rodillos estabilizadores puestos en la bañera.  5) Eliminate the usual vibrations and oscillations of the metal sheet at its exit from the bathtub when sheets with low thicknesses are processed, making it unnecessary to use the stabilizer rollers placed in the bathtub.
6) Suprimir el ruido durante la producción mejorando el ambiente de trabajo. 7) Evitar la aparición de dross (natas) en el metal fundido de la bañera. 6) Suppress noise during production by improving the work environment. 7) Avoid the appearance of dross (cream) in the molten metal of the bathtub.
EXPLICACIÓN DE LA INVENCIÓN De forma concreta, la invención propone, como ya se ha apuntado anteriormente, un dispositivo para reducir el espesor de recubrimiento sobre una lámina metálica. Dicho dispositivo no es sustitutivo de los métodos tradicionales, como por ejemplo los eyectores de aire, sino complementario a los mismos, disponiéndose preferiblemente a la salida de la línea de recubrimiento metálico para que actúe sobre la lámina después de los eyectores de aire/ gas. EXPLANATION OF THE INVENTION Specifically, the invention proposes, as already noted above, a device for reducing the thickness of coating on a metal sheet. Said device is not a substitute for traditional methods, such as air ejectors, but complementary to them, preferably being arranged at the exit of the metal coating line to act on the sheet after the air / gas ejectors.
Dicho dispositivo comprende al menos un filo de corte, preferiblemente un elemento alargado y de pequeño espesor, a modo de hilo, cordel, cuerda, alambre o cable, que tensionado entra en contacto con el recubrimiento de una lámina metálica para, mediante dicho contacto, reducir el espesor del metal fundido que recubre dicha lámina metálica.  Said device comprises at least one cutting edge, preferably an elongated and small thickness element, as a thread, string, rope, wire or cable, which tensioning comes into contact with the coating of a metal sheet for, by said contact, reduce the thickness of the molten metal that covers said metal sheet.
La lámina metálica a su salida de la bañera donde se encuentra el metal fundido presenta un recubrimiento con un espesor determinado por las condiciones del metal fundido, del metal de la lámina y de la velocidad de producción. Dicho recubrimiento posee en muchas ocasiones un espesor excesivo de material fundido y no es uniforme ni constante a lo largo de la superficie de la lámina. Por lo tanto, para eliminar el exceso de material fundido dispuesto sobre la lámina y conseguir un espesor constante, así como para conseguir una superficie uniforme, se dispone a la salida de la bañera el dispositivo objeto de la presente invención, preferiblemente un dispositivo a cada lado de la lámina en su recorrido ascendente.  The metal sheet at its exit from the bath where the molten metal is located has a coating with a thickness determined by the conditions of the molten metal, the sheet metal and the production speed. This coating often has an excessive thickness of molten material and is not uniform or constant along the surface of the sheet. Therefore, in order to remove the excess of molten material disposed on the sheet and achieve a constant thickness, as well as to achieve a uniform surface, the device object of the present invention, preferably a device to each bath, is disposed at the outlet of the bath side of the blade in its ascending path.
Como se ha mencionado, el dispositivo comprende al menos un filo de corte, el elemento alargado y de pequeño espesor, a modo de hilo o cuerda, que se dispone tensionado sobre un soporte rígido y que es elemento que va a permitir, al entrar en contacto con el metal fundido de la lámina, eliminar el exceso de material fundido en función de los requisitos de la lámina final. La longitud del filo de corte y por lo tanto del soporte rígido es al menos igual a la anchura de la lámina recubierta cuyo espesor es necesario reducir o ajusfar.  As mentioned, the device comprises at least one cutting edge, the elongated and small thickness element, as a thread or rope, which is arranged tensioned on a rigid support and which is an element that will allow, when entering contact with the molten metal of the sheet, remove excess molten material depending on the requirements of the final sheet. The length of the cutting edge and therefore of the rigid support is at least equal to the width of the coated sheet whose thickness is necessary to reduce or adjust.
Se ha previsto la incorporación de más de un soporte rígido mediante su incorporación a una estructura rotatoria, de manera que cuando un filo de corte se encuentre deteriorado, se podrá sustituir por un segundo filo de corte mediante el giro de la misma, evitando la parada del proceso productivo. La estructura rotatoria queda anclada a un cabezal por cada uno de sus extremos. Los cabezales sirven de soporte a toda la estructura y cuentan con un mecanismo para el desplazamiento vertical de los mismos, que cumple una doble función: por una parte es el elemento de anclaje de la estructura a la bancada (de modo que garanticen la estabilidad y posicionamiento de los cabezales y, por lo tanto, del filo de corte, paralelos a la lámina metálica durante el proceso de fabricación de la lámina recubierta) y por otra parte permiten controlar la altura a la que se dispone el filo de corte, en función de la velocidad de producción programada. Los cabezales también cuentan con un mecanismo de ajuste, que permite regular la distancia entre el filo de corte y la lámina de metal, en función del espesor del recubrimiento deseado. It is planned to incorporate more than one rigid support by incorporating it into a rotating structure, so that when a cutting edge is damaged, it can be replaced by a second cutting edge by turning it, avoiding stopping of the productive process. The rotary structure is anchored to a head by each of its ends. The heads support the entire structure and have a mechanism for vertical displacement of the same, that fulfills a double function: on the one hand it is the anchoring element of the structure to the bench (so that they guarantee the stability and positioning of the heads and, therefore, of the cutting edge, parallel to the sheet metal during the manufacturing process of the coated sheet) and, on the other hand, allow controlling the height at which the cutting edge is arranged, depending on the programmed production speed. The heads also have an adjustment mechanism, which allows to regulate the distance between the cutting edge and the metal sheet, depending on the thickness of the desired coating.
Se ha descrito un dispositivo para ser situado en un lado de la lámina, pero para que la lámina resultante obtenga un recubrimiento simétrico, se dispone un dispositivo equivalente en el lado opuesto. De hecho, es preferible que ambos dispositivos se dispongan sobre la misma bancada y la distancia entre los filos de corte y la lámina se regule mediante los mismos medios de traslación.  A device for being located on one side of the sheet has been described, but for the resulting sheet to obtain a symmetrical coating, an equivalent device is provided on the opposite side. In fact, it is preferable that both devices are arranged on the same bench and the distance between the cutting edges and the blade is regulated by the same means of translation.
El filo de corte, o elemento alargado tiene un espesor de al menos, entre 0,5 y 3,0 cm, preferiblemente entre 0,8 cm y 1 ,5 cm, y es de un material capaz de soportar altas temperaturas, al menos la temperatura del metal fundido cuando sale de la bañera, tal como una fibra sintética, natural o cerámica, (por ejemplo kevlar recubierto de cera, cerámica, etc.), y su sección, preferiblemente cuadrada, puede ser también circular, triangular o rectangular, entre otras. Asimismo, el material tiene que ser poco elástico para evitar su deformación y resistente a la tracción. Dicho filo de corte queda sujeto al soporte rígido mediante medios de sujeción conocidos, preferiblemente a presión.  The cutting edge, or elongated element has a thickness of at least 0.5 to 3.0 cm, preferably between 0.8 cm and 1.5 cm, and is made of a material capable of withstanding high temperatures, at least The temperature of the molten metal when leaving the bathtub, such as a synthetic, natural or ceramic fiber (for example, kevlar coated with wax, ceramics, etc.), and its section, preferably square, can also be circular, triangular or rectangular , among other. Also, the material has to be slightly elastic to avoid deformation and tensile strength. Said cutting edge is attached to the rigid support by known fastening means, preferably under pressure.
DESCRIPCIÓN DE LOS DIBUJOS DESCRIPTION OF THE DRAWINGS
Para complementar la presente descripción del dispositivo objeto de la invención, y para ayudar a una mejor comprensión de sus características, se acompaña la presente memoria descriptiva de unas figuras con carácter ilustrativo y no limitativo. To complement the present description of the device object of the invention, and to aid in a better understanding of its characteristics, the present descriptive report of figures with an illustrative and non-limiting nature is attached.
Las figuras números 1 y 2 muestran dos vistas en perspectivas de dos formas de realización de un dispositivo (A) según el objeto de la presente invención dispuesto en una línea de recubrimiento metálico a la salida de una bañera (10).  Figures 1 and 2 show two perspective views of two embodiments of a device (A) according to the object of the present invention arranged in a metal coating line at the exit of a bathtub (10).
La figura número 3 muestra una vista lateral de una forma preferente de realización del dispositivo objeto de la presente invención, en la que se observan los soportes rígidos (13) y sus respectivos filos de corte (6) dispuestos sobre una estructura rotatoria (14)  Figure number 3 shows a side view of a preferred embodiment of the device object of the present invention, in which rigid supports (13) and their respective cutting edges (6) arranged on a rotating structure (14) are observed.
Finalmente, la figura 4 muestra una representación esquemática y ampliada del funcionamiento simultáneo de dos dispositivos de reducción del espesor de recubrimiento metálico actuando sobre una lámina metálica, ubicados simétricamente a ambos lados de la lámina metálica (2), de manera que los filos de corte (6) sujetos y tensionados en los soportes rígidos (13 bis), al entrar en contacto con el recubrimiento metálico de la lamina (2'), eliminan simultáneamente el exceso de metal fundido (7) por ambos lados de la lámina (2'). Finally, Figure 4 shows a schematic and enlarged representation of the Simultaneous operation of two metal coating thickness reduction devices acting on a metal sheet, located symmetrically on both sides of the metal sheet (2), so that the cutting edges (6) are held and tensioned on the rigid supports (13 bis), when they come into contact with the metal coating of the sheet (2 ' ), they simultaneously remove excess molten metal (7) from both sides of the sheet (2 ' ).
REALIZACIÓN PREFERENTE DE LA INVENCIÓN PREFERRED EMBODIMENT OF THE INVENTION
A continuación se describe un ejemplo de realización del dispositivo (A) objeto de la invención a la vista de las citadas figuras. En particular, el dispositivo (A) para reducir el espesor de recubrimiento sobre una lámina de metal continua (2) se sitúa a la salida de una bañera (10) que contiene metal fundido (11) a una temperatura de aproximadamente 450 °C, de manera que cuando la lámina continua de metal (2) atraviesa dicha bañera (10) y sale impulsada verticalmente de la misma por el skin roll o cilindro (1) presentando dicha lámina de metal saliente 2' sobre sus dos caras laterales o lados, un exceso de recubrimiento metálico (7) que es necesario eliminar en parte. An embodiment of the device (A) object of the invention is described below in view of the aforementioned figures. In particular, the device (A) for reducing the coating thickness on a sheet of continuous metal (2) is placed at the exit of a bathtub (10) containing molten metal (11) at a temperature of approximately 450 ° C, so that when the continuous sheet of metal (2) passes through said bathtub (10) and is driven vertically therefrom by the skin roll or cylinder (1) presenting said protruding metal sheet 2 ' on its two side faces or sides, an excess of metallic coating (7) that needs to be partially removed.
Para eliminar el exceso de metal fundido (7) dispuesto sobre la lámina (2), se dispone al menos un dispositivo (A) objeto de la presente invención, preferiblemente dos enfrentados (A), a la salida de dicha bañera (10). El dispositivo (A) comprende al menos un filo de corte (6) que entra en contacto con el recubrimiento de la lámina (2') para retirar el exceso de metal fundido (7), cayendo el exceso de metal fundido desprendido (7) de vuelta a la bañera (10). Dicho filo de corte (6) es un hilo, cuerda, cordel, alambre o cable, en definitiva un elemento alargado y de reducido espesor, con sección preferiblemente cuadrada, de un material que resiste temperaturas iguales al menos a la temperatura de salida del metal fundido de la bañera (10) y resistente a la tracción El material es preferiblemente Keviar, y más preferiblemente Keviar recubierto de cera. To remove the excess of molten metal (7) disposed on the sheet (2), at least one device (A) object of the present invention, preferably two facing each other (A), is disposed at the exit of said bathtub (10). The device (A) comprises at least one cutting edge (6) that comes into contact with the coating of the sheet (2 ' ) to remove the excess of molten metal (7), dropping the excess of molten metal detached (7) back to the bathtub (10). Said cutting edge (6) is a wire, rope, string, wire or cable, in short, an elongated and reduced thickness element, preferably with a square section, of a material that resists temperatures equal to at least the metal outlet temperature. bath fade (10) and tensile resistant The material is preferably Keviar, and more preferably Keviar coated with wax.
Dicho filo de corte (6) se dispone tensado sobre un soporte rígido (13) de una longitud al menos igual a la anchura de los lados de la lámina de metal 2', ubicado paralelamente a la lámina de metal (2'), y que se encuentra unido a una estructura rotatoria (14). Said cutting edge (6) is arranged tensioned on a rigid support (13) of a length at least equal to the width of the sides of the metal sheet 2 ' , located parallel to the metal sheet (2 ' ), and which is attached to a rotating structure (14).
La estructura rotatoria (14) encaja en unos cabezales (9) ubicados en sus extremos que disponen de un mecanismo de movimiento vertical (4) que actúa de soporte y permite el anclaje del conjunto del dispositivo (A) a la bancada de la línea de recubrimiento metálico, así como la regulación de la altura del filo de corte (6) en función de la velocidad de producción deseada. Dichos cabezales (9) cuentan a su vez con un mecanismo de ajuste (8) que permite acercar o alejar el filo de corte (6) de la lámina metálica (2'), al objeto de regular el espesor de recubrimiento deseado. En una construcción más sencilla, como la mostrada en la figura 1 , se prescinde de dichos mecanismos de movimiento vertical (4) y de los mecanismos de ajuste para alejar o acercar el filo de corte (6) a la lámina 2'. The rotary structure (14) fits in heads (9) located at its ends that have a vertical movement mechanism (4) that acts as a support and allows the anchorage of the whole device (A) to the bed of the line of metallic coating, as well as the regulation of the height of the cutting edge (6) depending on the desired production speed. Said heads (9) have, in turn, an adjustment mechanism (8) that allows the cutting edge (6) of the metal sheet (2 ' ) to be zoomed in or out, in order to regulate the desired coating thickness. In a simpler construction, such as that shown in Figure 1, said vertical movement mechanisms (4) and the adjustment mechanisms to move the cutting edge (6) away from the sheet 2 ' are dispensed with.
Los cabezales (9), están dotados de una junta para el movimiento circular, permitiendo girar la estructura rotatoria (14) de modo que, al disponer en la misma de varios soportes rígidos (13) con sus correspondientes filos de corte (6), cuando un filo de corte (6) se encuentra desgastado o roto, este primer filo (6) sea sustituido por un segundo filo de corte (6), y mientras trabaja este segundo filo de corte (6) puede ser sustituido el primer filo (6) del soporte rígido (13), evitando paradas en la línea de producción.  The heads (9), are provided with a joint for circular movement, allowing the rotating structure (14) to be rotated so that, by having several rigid supports (13) therein with their corresponding cutting edges (6), when a cutting edge (6) is worn or broken, this first edge (6) is replaced by a second cutting edge (6), and while working this second cutting edge (6) the first edge ( 6) of the rigid support (13), avoiding stops in the production line.
El conjunto formado por los cabezales (9), la estructura rotatoria (14), los soportes rígidos (13) y filos de corte (6) del dispositivo (A) se encuentra apoyado por medio del mecanismo de movimiento vertical (4) sobre una bancada firmemente fijada pero aislada de posibles vibraciones para evitar que el filo de corte (6) se vea afectado durante su trabajo por causas externas, y afecte asimismo al recubrimiento de la lámina (2).  The assembly formed by the heads (9), the rotary structure (14), the rigid supports (13) and cutting edges (6) of the device (A) is supported by means of the vertical movement mechanism (4) on a bench firmly fixed but isolated from possible vibrations to avoid that the cutting edge (6) is affected during its work by external causes, and also affects the coating of the sheet (2).
Conviene destacar que es posible que el dispositivo objeto de la invención (A) esté ubicado en frente de otro dispositivo (A) idéntico situados a ambos lados de la lámina de acero (2') cuyo recubrimiento se quiere reducir, de manera que eliminan simultáneamente el exceso de metal fundido (7) por ambos lados de la lámina (2'). Preferiblemente, los filos de corte (6) de dos dispositivos (A) que trabajan conjuntamente se encuentran enfrentados y presentan estructuras rotatorias (14) y cabezales (9) simétricos. Asimismo, pueden compartir la bancada de manera que el mecanismo de ajuste (8) sea común para ambos, permitiendo el acercamiento o alejamiento de ambos filos de corte (6) a la vez asegurando así la simetría también de la lámina de acero (2") recubierta. It should be noted that it is possible that the device object of the invention (A) is located in front of another identical device (A) located on both sides of the steel sheet (2 ' ) whose coating is to be reduced, so that they simultaneously eliminate excess molten metal (7) on both sides of the sheet (2 ' ). Preferably, the cutting edges (6) of two devices (A) that work together are facing each other and have rotational structures (14) and symmetrical heads (9). They can also share the bed so that the adjustment mechanism (8) is common to both, allowing the approach or distance of both cutting edges (6) at the same time thus ensuring the symmetry of the steel sheet (2 ") ) coated.

Claims

REIVINDICACIONES
1. Dispositivo para reducir el espesor de recubrimiento metálico sobre una lámina metálica, destinado a utilizarse en una línea de recubrimiento metálico y/o galvanizado en continuo, a la salida de una bañera que contiene un metal fundido para el recubrimiento de la lámina, para reducir la cantidad de metal de recubrimiento aplicado sobre dicha lámina de metal, caracterizado porque comprende al menos un filo de corte, situado sobre un soporte rígido y a un lado de la lámina metálica, manteniendo dicho soporte el filo de corte en tensión y paralelo a la lámina metálica, de manera que dicho filo de corte cuando entra en contacto con el recubrimiento de la lámina retira el exceso de metal fundido de recubrimiento que vuelve a la bañera. 1. Device for reducing the thickness of metal coating on a metal sheet, intended for use in a line of metal coating and / or continuous galvanizing, at the exit of a bathtub containing a molten metal for coating the sheet, for reduce the amount of coating metal applied on said metal sheet, characterized in that it comprises at least one cutting edge, located on a rigid support and on one side of the metal sheet, said support keeping the cutting edge in tension and parallel to the sheet metal, so that said cutting edge when it comes into contact with the coating of the sheet removes the excess molten metal coating that returns to the bathtub.
2. Dispositivo, según reivindicación 1 , caracterizado porque la longitud del filo de corte es al menos igual a la anchura de la lámina metálica.  2. Device according to claim 1, characterized in that the length of the cutting edge is at least equal to the width of the metal sheet.
3. Dispositivo, según reivindicación 1 , caracterizado porque el soporte rígido se sitúa sobre una estructura rotatoria dispuesta sobre cabezales situados en los dos extremos de dicha estructura. 3. Device according to claim 1, characterized in that the rigid support is placed on a rotating structure arranged on heads located at the two ends of said structure.
4. Dispositivo, según reivindicación 3, caracterizado porque los cabezales se apoyan sobre una bancada. 4. Device according to claim 3, characterized in that the heads are supported on a bench.
5. Dispositivo, según reivindicación 3, caracterizado porque los cabezales disponen de mecanismos que permiten mantener el filo de corte paralelo a la lámina metálica. 5. Device according to claim 3, characterized in that the heads have mechanisms that allow keeping the cutting edge parallel to the metal sheet.
6. Dispositivo, según reivindicación 3, caracterizado porque los cabezales comprenden medios de traslación para elevar o descender y acercar o alejar el filo de corte de la lámina.  6. Device according to claim 3, characterized in that the heads comprise translation means for raising or lowering and bringing the cutting edge of the sheet closer or further away.
7. Dispositivo, según reivindicación 1 , caracterizado porque el filo de corte es un elemento alargado y de espesor entre 0,5 y 3,0 cm.  7. Device according to claim 1, characterized in that the cutting edge is an elongated element with a thickness between 0.5 and 3.0 cm.
8. Dispositivo, según reivindicación 7, caracterizado porque el filo de corte es una cuerda, un hilo, un alambre, un cordel o un cable.  Device according to claim 7, characterized in that the cutting edge is a rope, a thread, a wire, a string or a cable.
9. Dispositivo, según reivindicación 1 , caracterizado porque el filo de corte es de un material resistente a la temperatura de salida del material fundido de la bañera y resistente a la tracción. 9. Device according to claim 1, characterized in that the cutting edge is made of a material that is resistant to the temperature of the molten material of the bath and is resistant to traction.
10. Dispositivo, según reivindicaciones anteriores, caracterizado porque comprende al menos dos filos de corte situado cada uno a un lado de la lámina metálica, de manera que cada filo de corte elimina el exceso de recubrimiento de cada lado de la lámina. 10. Device, according to previous claims, characterized in that it comprises at least two cutting edges each located on one side of the metal sheet, so that each cutting edge removes excess coating on each side of the sheet.
PCT/ES2012/070299 2012-04-30 2012-04-30 Device for reducing the thickness of a metallic coating on a metallic sheet WO2013164493A1 (en)

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Publication number Priority date Publication date Assignee Title
WO2018025222A1 (en) * 2016-08-05 2018-02-08 Medea S.R.L. Device for the controlled reduction of the thickness of metallic coatings obtained with the technique of the hot bath in molten metal

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JPS589964A (en) * 1981-07-10 1983-01-20 Nisshin Steel Co Ltd Method and device for controlling plating thickness in continuous hot dipping of steel strip
JPH02243751A (en) * 1989-03-16 1990-09-27 Sumitomo Metal Ind Ltd Wiping method for continuous hot dipping
JPH0448056A (en) * 1990-06-15 1992-02-18 Kawasaki Steel Corp Device for adjusting coating weight of hot dip metal coating
JP2005256055A (en) * 2004-03-10 2005-09-22 Jfe Steel Kk Consecutive hot dip metal coating method and its apparatus
EP1586672A1 (en) * 2004-04-13 2005-10-19 Mitsubishi-Hitachi Metals Machinery, Inc. Liquid wiping apparatus

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Publication number Priority date Publication date Assignee Title
JPS589964A (en) * 1981-07-10 1983-01-20 Nisshin Steel Co Ltd Method and device for controlling plating thickness in continuous hot dipping of steel strip
JPH02243751A (en) * 1989-03-16 1990-09-27 Sumitomo Metal Ind Ltd Wiping method for continuous hot dipping
JPH0448056A (en) * 1990-06-15 1992-02-18 Kawasaki Steel Corp Device for adjusting coating weight of hot dip metal coating
JP2005256055A (en) * 2004-03-10 2005-09-22 Jfe Steel Kk Consecutive hot dip metal coating method and its apparatus
EP1586672A1 (en) * 2004-04-13 2005-10-19 Mitsubishi-Hitachi Metals Machinery, Inc. Liquid wiping apparatus

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018025222A1 (en) * 2016-08-05 2018-02-08 Medea S.R.L. Device for the controlled reduction of the thickness of metallic coatings obtained with the technique of the hot bath in molten metal
IT201600082676A1 (en) * 2016-08-09 2018-02-09 Medea S R L CONTROLLED REDUCTION DEVICE OF THE THICKNESS OF METALLIC COATINGS OBTAINED WITH THE HOT BATHROOM TECHNIQUE

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