WO2000077272A1 - Procede et dispositif destines a l'application d'un revetement sur un objet allonge - Google Patents

Procede et dispositif destines a l'application d'un revetement sur un objet allonge Download PDF

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Publication number
WO2000077272A1
WO2000077272A1 PCT/SE2000/001168 SE0001168W WO0077272A1 WO 2000077272 A1 WO2000077272 A1 WO 2000077272A1 SE 0001168 W SE0001168 W SE 0001168W WO 0077272 A1 WO0077272 A1 WO 0077272A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
electromagnetic field
molten metal
applying
longitudinal direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SE2000/001168
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English (en)
Other versions
WO2000077272A8 (fr
Inventor
Saeid Ebrahim
Jan Erik Eriksson
Göte Tallbäck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB AB
Original Assignee
ABB AB
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 ABB AB filed Critical ABB AB
Priority to AU55829/00A priority Critical patent/AU5582900A/en
Publication of WO2000077272A1 publication Critical patent/WO2000077272A1/fr
Publication of WO2000077272A8 publication Critical patent/WO2000077272A8/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C23C2/24—Removing excess of molten coatings; Controlling or regulating the coating thickness using magnetic or electric fields

Definitions

  • the present invention relates to a method of applying a coating onto an elongated object, said object being continuously transported along a transportation direction from an arrangement for depositing a coating comprising a molten metal onto the object to an arrangement for receiving the coated object, wherein excessive coating is wiped off in a longitudinal direction of the object substantially opposite to the transportation direction.
  • the invention also relates to a device for applying a coating onto an elongated object, comprising an arrangement for depositing a molten metal onto the object, an arrangement for receiving the coated object, means for continuously transporting said object along a transportation direction from the depositing arrangement to the receiving arrangement, and means for wiping off excessive coating from the object in a longitudinal direction substantially opposite to the transportation direction.
  • the invention will hereinafter be described with reference to such an application.
  • the invention is also ap- plicable to other, similar applications, such as when somewhat thicker coatings are applied by continuously casting a metallic coating onto an object, such as a metal strip.
  • the steel strip is continuously passed through a bath containing molten metal, normally zinc. In the bath, it normally passes under a submerged roll and then moves upwards through stabilising and correcting rolls. It emerges from the bath and travels through a set of gas knives which blow the excess zinc off the strip and back down towards the bath, thus controlling the coating thickness.
  • the gas in the knives can be air, nitrogen, steam, or an inert gas, but air and nitrogen are most commonly used.
  • the strip then continues unsupported until the coating has had time to cool and solidify.
  • the coated steel strip is then linked or directed via a roll to an arrangement for cutting the strip into separate strip elements or winding the strip onto a roll. Normally, the strip moves in a vertical direction from the submerged roll through the correcting and stabilising rolls and the gas knives to the roll, the top roll, via which it is further directed.
  • the coating thickness should be even and thin.
  • the coating mass is normally measured after the strip has passed around the top roll, and this reading is used to control the gas knives and hence regulate the coating thickness.
  • the steel strip will move or vibrate in a direction generally perpendicularly to its forwarding direction.
  • Certain measures, such as the use of the correcting and stabilising rolls, a very precise control of the gas flow from the gas knives, and an adjustment of the steel strip speed and/or the adjustment of the distance over which the strip has to run unsupported may be taken in order to reduce these transverse movements. If not reduced, these transverse movements will significantly disturb the precise wiping of the gas knives, resulting in an uneven coating thickness.
  • the magnetic wiping device generates an alternating magnetic (AC) field which is used to wipe off excessive coating from the strip.
  • AC alternating magnetic
  • the use of the magnetic wiping device helps to make it possible to increase the strip speed while maintaining an accurate and exact wiping off of excessive coating.
  • the alternating magnetic field is a magnetic field which moves in a direction opposite to the transportation direction of the elongated object.
  • excessive coating is wiped off in a longitudinal direction opposite to the transportation direction of the elongated object.
  • the current induced in the coating cannot reach the very edge for physical reasons.
  • the coating covering said regions will not be properly wiped off, resulting in an uneven coating thickness across the width of the strip.
  • FR-A-2 754 545 discloses a device for wiping off excessive coating from a metal strip.
  • the device includes centrally provided air knives arranged to wipe off excessive coating in a longitudinal direction substantially opposite to the transportation direction of the metal strip.
  • this document discloses electromagnetic actuators provided at the respective lateral edges of the metal strip.
  • the actuators produce an alternating magnetic force at a frequency between 500 KHz and 1 MHz.
  • the actuators are arranged to produce magnetic fields providing forces to the excessive coating in a direction inwardly towards the centre of the metal strip.
  • One object of the present invention is to provide a method that makes it possible to obtain a coating having a thickness as even as possible across the width of the elongated object onto which said coating is applied. It should also make it possible to precisely control the thickness of the coating in the regions of one or both of the opposite lateral edges of the elongated object.
  • the method should also be easily incorporated into an industrial process for manufacturing coated, elongated objects, in particular steel strips coated with an anti-corrosive metal, e.g. zinc.
  • a method as initially defined characterised in that a first moving electromagnetic field, generating a force acting on the molten metal coating towards a first lateral edge of the coated object, is applied to at least a region adjacent to said first lateral edge of the coated object, and a second moving electromagnetic field, generating a force acting on the molten metal coating towards a second opposite lateral edge of the coated object, is applied to the object in a region adjacent to the second lateral edge of the coated object.
  • the method proposes to wipe off excessive coating in a lateral direction of the elongated object. This is done as a supplement to wiping off excessive coating in a longitudinal direction opposite to the transportation direction of the object.
  • the inventive method is also advantageous when combined with other techniques for wiping off the excessive coating in the longitudinal direction, e.g. by means of gas knives.
  • the force acting in a direction generally towards a lateral edge of the coated object is preferably substantially perpendicular to the longitudinal direction of the object, but could nevertheless be almost of any main direction having at least a substantial component in the direction perpendicular to the longitudinal direction of the object. Such a main direction could be within ⁇ 45° from the lateral direction.
  • the inventive method is perfectly suited for the production of coated objects, both lateral edges of which should have a precisely controlled coating thickness.
  • the electromagnetic field generating a force acting on the molten metal coating in a direction opposite to the transportation direction of the object, is preferably used to wipe off the excessive coating across a major part of the width of the elongated object, including the middle of the object.
  • the electromagnetic fields generating the forces in the lateral directions could be used as a perfect supplement to the electromagnetic field generating the force in the direction opposite to the transportation direction of the object in order to accomplish a supplementary wiping off of excessive coating in the lateral direction of the object.
  • the object has the shape of a continuous strip or web.
  • the electromagnetic fields generated extend through the thickness direction of the strip or web, thus generating said forces on the coating on the opposite sides of the strip or web, resulting in the excessive coating being wiped off on both sides of the strip or web.
  • Another object of the invention is to provide a device which makes it possible to obtain a coating having a thickness as even as possible across the width of an object coated by means of a device as initially defined.
  • the device should be such that it also makes it possible to precisely control the coating thickness in one or both regions adjacent to or at the lateral edges of the coated object. It should also promote a cost effective and reliable industrial manufacture of coated, elongated objects, such as zinc coated steel strips.
  • This object is obtained by means of a device as initially defined, characterised in that it comprises first means for applying a first moving electromagnetic field generating a force acting on the molten metal coating towards a first lateral edge of the object, and second means for applying a second moving electromagnetic field generating a force acting on the molten metal coating towards a second, opposite lateral edge of said object.
  • Such forces will wipe off excessive coating from the object if generated in regions adjacent to the lateral edges and moving towards said edge.
  • the direction of the forces are such that at least a substantial component thereof is directed towards the respective lateral edge of the object.
  • the forces are directed substantially perpendicularly to the longitudinal direction of the object.
  • the electromagnetic fields extend over a predetermined length in the longitudinal direction of the object, defining a wave movement towards the edge of the object.
  • the current induced in the coating mainly extends in the longitudinal direction of the object, except from the end regions of the field.
  • the first and second means are located in the region adjacent to a corresponding edge in order to apply an electromagnetic field moving towards the respective lateral edge.
  • a location in the region adjacent to the corresponding edge promotes a precise control of the electromagnetic field generating said force on the coating.
  • the supplementary means for wiping off excessive coating in the longitudinal direction of the object might be arranged in order to wipe of excessive coating between the regions covered by the first and second means.
  • the means for wiping off excessive coating in a longitudinal direction is arranged to apply an electromagnetic field generating a force acting on the molten metal coating in a direction opposite to the transportation direction of the object, and the first and second means adapted to wipe off excessive coating in a lateral direction that, for technical reasons, cannot be wiped off in the longitudinal direction by the means for wiping off excessive coating in the longitudinal direction.
  • This provision does not exclude that the means for applying the lateral forces do wipe off also molten coating that could be wiped off by the magnetic field generating the longitudinally directed force.
  • the different regions covered by the different electromagnetic fields should be in the proximity to each other, while covering the total width of the object but, preferably, without or only slightly overlapping each other. Thereby, an even coating thickness across the width of the coated object is promoted.
  • the object has the shape of a continuous strip or web.
  • the inventive device is particularly advantageous when used for covering such an object with a metal coating.
  • the invention also refers to the use of the inventive method for applying a coating onto an elongated strip, and the use of the inventive device for applying a coating onto an elongated strip.
  • fig. 1 is a schematic perspective view of a device according to the invention
  • fig. 2 is a schematic, partly cut front view of the inventive device
  • fig. 3 is a cross-sectional view from above of the inventive device along A-A in fig. 2
  • fig. 4 is a schematic side view of the inventive device.
  • FIG. 1 A preferred embodiment of the inventive device is shown in figs. 1 -4. It should be stated that the device is only shown schematically and by way of example.
  • the device comprises an arrangement 1 for depositing a coating of molten metal onto an object 2. It also comprises an arrangement 3 for receiving the coated object 2 and means 4, 5 for continuously or semi-continuously transporting or feeding said object 2 from the depositing arrangement 1 to the receiving arrangement 3.
  • a transporting means 4, 5 could, for example, comprise a driven roll or the like, via which the object 2 is directed along a given path.
  • the object 2 is elongated and has a cross-sectional area substantially smaller than its length. It can be a strip or a web or the like. Preferably, it is made of metal, such as steel or any other metal suitable for coating processes of the kind suggested by the invention.
  • the coating and the object may have the same or different chemical compositions.
  • the arrangement for depositing a molten metal onto the object 2 comprises a tank 6 containing a bath 7 of molten metal.
  • the object 2 is fed or directed into the bath 7 and redirected by means of a redirection member arranged in the bath 7.
  • the redirection member is a roll arranged in the tank 6 and identical with the transporting means 4.
  • the roll 4 is submerged in the bath.
  • Also submerged in the bath 7 is a set of correcting and stabilising rolls 8, 9, arranged downstream the redirection member/transporting means 4, as seen in the transportation direction of the object 2.
  • the object 2 runs generally unsupported all the way to the receiving arrangement 3 where a redirecting member 5 comes into contact with the object 2 and is directed to a member 1 1 for storing the coated object 2.
  • a member 1 1 for storing the coated object 2 could be a roll onto which the object 2 is wound.
  • the redirecting member 5 is a roll which also might be driven in order to feed the object 2 forward in its transportation direction towards the storing member.
  • the device is arranged such that the path of the object 2 runs generally vertically from the region of the surface 10 to the arrangement 3 for receiving the object 2.
  • the object 2 runs generally unsupported from said region to the receiving arrangement 3.
  • a means 12 for wiping off excessive coating in a direction opposite to the transportation direction of the object 2 is arranged.
  • the means 12 may comprise a device that uses gas for said wiping operation, a device that generates an alternating magnetic field for said wiping operation or a combination there- of.
  • the means 12 comprise two sets of coils arranged on opposite sides of the object 2 in order to apply a moving electromagnetic field through the object 2, said field inducing current paths I in the coating, schematically shown in fig. 2, and accordingly, a force acting upon the coating in a direction opposite to the transportation direction of the object 2.
  • the means 12 operates in accordance with the principles for a linear motor or an electromagnetic stirrer in order to accomplish the moving electromagnetic field. Thereby, excessive coating is wiped off in a longitudinal direction by the means 12.
  • the current I induced in the coating by the means 12 does not extend all the way to the opposite lateral edges 15, 16 of the object 2. This effect has physical reasons and must be accepted.
  • the excessive coating in the regions adjacent to the opposite lateral edges 15, 16 of the object 2 will not be properly wiped off by the means 12.
  • an unevenness in the thickness of the coating is likely to appear.
  • the means only would comprise gas knives, there would still be thickness problems due to air turbulence at the edges of the object 2.
  • first and second means 13, 14 for applying two separate electromagnetic fields located adjacent to or at the opposite first and second lateral edges 15, 16 of the object 2.
  • Each of the first and second means 13, 14 include two sets of coils arranged at and overlapping opposite sides of the object 2.
  • the first and second means 13, 14 operate in accordance with the principles of a linear motor or an electromagnetic stirrer, such that the generated electromagnetic field moves towards the lateral edge 15, 16 adjacent to which the means 13, 14 are arranged.
  • Each of the means 13, 14 operates in a way similar to the means 12, but with the moving direction of their electromagnetic fields turned 90° with respect to the moving direction of the electromagnetic field generated by the means 12.
  • the first and second means 13, 14 generate forces F', F" upon the coating directed to the adjacent lateral edge 15, 16 of each means 13, 14, such that excessive coating is wiped off laterally through the action of said first and second means 13, 14.
  • the task of the means 13, 14 is to wipe off excessive coating that cannot be wiped off by the means 12 for physical reasons, as mentioned above.
  • the thickness of the coating of the regions adjacent to the opposite lateral edges 15, 16 of the object 2 can be precisely controlled, such that an even coating thickness across the width of the object 2 is obtained.
  • the currents I induced by the means 13, 14 in the coating are schematically indicated in fig. 2. They mainly extend in the longitudinal direction of the object 2.
  • the object 2 is a continuous strip or web, preferably made of steel, and the coating mainly comprises zinc.
  • This galvanised steel strip is preferably used for chassi parts of motor vehicles.
  • all kinds of applications may come in question.
  • the object 2 is transported with a speed of approximately 90-300 m/min.
  • the strength of the magnetic fields generated by the means 13, 14 should be approximately 0.5-1 .5 T.
  • a moving electromagnetic field requires a low feeding frequency in order to accomplish a lateral force like the one aimed at.
  • the feeding AC-frequency should be 1 -1000 Hz, preferably 10-500 Hz, and more preferably 30-150 Hz. Too high a frequency will lead to an excessive heating of the strip.
  • the means 12, 13, 14 for generating said magnetic fields may comprise one or more magnets or coils that generate said field and that these magnets or coils may be arranged such that the magnetic fields are divided into a plurality of sub-fields of equal or unequal strength and/or direction through the object.
  • the field or fields should be applied to the coating where the latter is still in a molten state.
  • the inventive device could also include or be combined with means for cooling the coated object downstream the means 12, 13, 14 for applying the electromagnetic fields in order to speed up the solidification of the coating and making it possible to shorten the distance between the depositing arrangement 1 and the arrangement 3 for receiving the coated object.
  • means for cooling the coated object downstream the means 12, 13, 14 for applying the electromagnetic fields in order to speed up the solidification of the coating and making it possible to shorten the distance between the depositing arrangement 1 and the arrangement 3 for receiving the coated object.
  • the receiving arrangement 3 does not need to be exactly of the kind described here, but could be described as being comprised by the first element or elements by which the coated object 2 is supported downwards from the depositing arrangement 1 as seen in the transportation direction of the object 2.
  • the means 12 for applying a magnetic field generating a force acting on the coating in a direction opposite to the transportation direction of the object 2 could be any such means for wiping off excessive coating in the longitudinal direction of the object 2, such as gas knives.
  • the means 12 as described above are preferred.

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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)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating With Molten Metal (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant d'appliquer un revêtement sur un objet allongé (2), transporté de manière semi-continue ou continue le long d'une direction de transport, depuis un appareil (1) destiné au dépôt sur l'objet (2) d'un revêtement contenant un métal fondu, à un appareil (3) destiné à recevoir l'objet revêtu (2). Un dispositif permet d'enlever le revêtement en excès dans la direction longitudinale de l'objet, sensiblement opposée à la direction de transport. On applique à l'objet revêtu (2) un premier champ électromagnétique mobile qui génère une force agissant sur le revêtement à base de métal fondu, vers un premier bord latéral (15) de l'objet (2). On applique un second champ électromagnétique mobile qui génère une force agissant sur le revêtement à base de métal fondu, vers un second bord latéral (16) de l'objet (2), opposé au premier bord latéral.
PCT/SE2000/001168 1999-06-11 2000-06-06 Procede et dispositif destines a l'application d'un revetement sur un objet allonge Ceased WO2000077272A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU55829/00A AU5582900A (en) 1999-06-11 2000-06-06 A method and a device for applying a coating onto an elongated object

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9902201-4 1999-06-11
SE9902201A SE9902201L (sv) 1999-06-11 1999-06-11 Ett förfarande och en anordning för applicering av en beläggning på ett långsträckt objekt

Publications (2)

Publication Number Publication Date
WO2000077272A1 true WO2000077272A1 (fr) 2000-12-21
WO2000077272A8 WO2000077272A8 (fr) 2001-09-20

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PCT/SE2000/001168 Ceased WO2000077272A1 (fr) 1999-06-11 2000-06-06 Procede et dispositif destines a l'application d'un revetement sur un objet allonge

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AU (1) AU5582900A (fr)
SE (1) SE9902201L (fr)
WO (1) WO2000077272A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007004945A1 (fr) * 2005-06-30 2007-01-11 Abb Ab Dispositif et methode de réglage de l’epaisseur

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5013219B1 (fr) * 1969-07-31 1975-05-17
JPS57169076A (en) * 1981-04-11 1982-10-18 Sumitomo Metal Ind Ltd Controlling device for coating weight of molten metal in continuous hot dipping
JPS61266560A (ja) * 1985-05-22 1986-11-26 Nippon Steel Corp 薄目付溶融メツキ法
JPH06240434A (ja) * 1993-02-17 1994-08-30 Nisshin Steel Co Ltd 溶融金属めっき鋼板のエッジオ−バ−コ−ト防止方法
JPH0853742A (ja) * 1994-08-10 1996-02-27 Nippon Steel Corp 巾方向均一連続溶融メッキ法
FR2754545A1 (fr) * 1996-10-10 1998-04-17 Maubeuge Fer Procede et dispositif d'essorage d'une bande metallique revetue en continu ou trempe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5013219B1 (fr) * 1969-07-31 1975-05-17
JPS57169076A (en) * 1981-04-11 1982-10-18 Sumitomo Metal Ind Ltd Controlling device for coating weight of molten metal in continuous hot dipping
JPS61266560A (ja) * 1985-05-22 1986-11-26 Nippon Steel Corp 薄目付溶融メツキ法
JPH06240434A (ja) * 1993-02-17 1994-08-30 Nisshin Steel Co Ltd 溶融金属めっき鋼板のエッジオ−バ−コ−ト防止方法
JPH0853742A (ja) * 1994-08-10 1996-02-27 Nippon Steel Corp 巾方向均一連続溶融メッキ法
FR2754545A1 (fr) * 1996-10-10 1998-04-17 Maubeuge Fer Procede et dispositif d'essorage d'une bande metallique revetue en continu ou trempe

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 197524, Derwent World Patents Index; AN 1975-40243W *
DATABASE WPI Week 198702, Derwent World Patents Index; AN 1987-010091 *
DATABASE WPI Week 199439, Derwent World Patents Index; AN 1994-314127 *
DATABASE WPI Week 199618, Derwent World Patents Index; AN 1996-1975894 *
PATENT ABSTRACTS OF JAPAN *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007004945A1 (fr) * 2005-06-30 2007-01-11 Abb Ab Dispositif et methode de réglage de l’epaisseur

Also Published As

Publication number Publication date
SE9902201D0 (sv) 1999-06-11
WO2000077272A8 (fr) 2001-09-20
SE9902201L (sv) 2000-12-12
AU5582900A (en) 2001-01-02

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