EP1457581A1 - Kontrolle der Dicke einer flüssigen Oberflächenschicht auf einem, aus einem Schmelzbad austretendem, langgestrecktem Gegenstand. - Google Patents

Kontrolle der Dicke einer flüssigen Oberflächenschicht auf einem, aus einem Schmelzbad austretendem, langgestrecktem Gegenstand. Download PDF

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Publication number
EP1457581A1
EP1457581A1 EP04447055A EP04447055A EP1457581A1 EP 1457581 A1 EP1457581 A1 EP 1457581A1 EP 04447055 A EP04447055 A EP 04447055A EP 04447055 A EP04447055 A EP 04447055A EP 1457581 A1 EP1457581 A1 EP 1457581A1
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EP
European Patent Office
Prior art keywords
liquid
strip
blades
bath
thickness
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.)
Withdrawn
Application number
EP04447055A
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English (en)
French (fr)
Inventor
Philippe Klinkenberg
Stéphane Winand
Jean Crahay
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.)
Centre de Recherches Metallurgiques CRM ASBL
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
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 Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Publication of EP1457581A1 publication Critical patent/EP1457581A1/de
Withdrawn legal-status Critical Current

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    • 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
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates

Definitions

  • the present invention relates to a method of controlling the thickness of a liquid layer to the surface of an elongated object emerging from a bath.
  • the process relates more particularly to a product long (flat) or flat (strip) metallurgical continuous in the bath.
  • Examples of areas of application of the invention relate to spinning in the dip coating process, preferably the galvanizing or in the cooling process accelerated in continuous annealing.
  • the invention also relates to a installation for implementing the process.
  • coating soaking is a method that is both simple and effective in depositing a coating on the surface of a object.
  • the object to be coated is immersed in a bath comprising the product that we want to deposit on said object.
  • the object is then extracted from the bath with removal of excess liquid and coating is returned solid, for example by drying, solidification, polymerization, etc.
  • the spin must be uniform over the entire "section", that is to say the width for a strip and the circumference for a wire, and over the entire length of the product to be coated.
  • this operation must strictly limit the deposit to the target value, which is usually expressed either in terms of deposited thickness - typically 3 to 20 ⁇ m - or in weight of the layer deposited per unit of surface-typically in gr / m 2 .
  • the spin was first carried out by mechanical means by pressing a scraper member against the surface of the strip emerging from the coating bath.
  • gas blades were introduced. They include gas jets respectively linear in the case of bands and circular in the case of wires. These gas jets come from of slots and are directed most often perpendicular to the surface to be treated.
  • the blades of gases act as "pneumatic scrapers” and have the advantage of operating without mechanical contact and therefore without risk of scratching the object treated. Such blades were called “gas extractors” or “spin knives”.
  • the gas blade spin is currently most common in facilities continuous dip coating.
  • the gas used is either air or a neutral gas such as nitrogen in the most delicate applications such as the treatment of steel strips for the production of parts visible for automobile bodywork.
  • Electromagnetic methods have also been developed. Like gas blades, they work without contact. However, they often give rise to a heating of the treated strip which is due to the currents which are induced there by the electromagnetic systems (M. Malmendier et al., Development of galvannealing for the domestic appliance, construction and other markets, European Coal and Steel Community Project Report, 1998; NKK Corp. EP-A-0 525 387).
  • Figure 1.a shows schematically the general device for wringing a steel strip.
  • a strip to be coated 1 emerges vertically from a liquid bath 2. It passes in front of 3 and 3 'spin slots which create gas blades 4 and 4 'respectively which are projected on both sides of the strip respectively in 5 and 5 '. Under the action of the gas blades, the thickness of liquid adherent is reduced from a first thickness 6 to a second thickness 7. For reasons of clarity of the figure, the scale of the total thicknesses of strip and entrained liquid has been intentionally exaggerated.
  • the thickness carried by the emerging strip liquid depends mainly on the nature of the bath, more particularly the viscosity of the liquid, and the belt speed.
  • Several models have been built to account for this phenomenon. If the formulation differs from one model to another, the phenomenon reported by all models is the same: liquid thickness carried by the band out of the bath increases with the belt speed (see figure 1.b).
  • the physical phenomenon that explains the spin at the "microscopic" level is the pressure gradient which exists between the point of impact of the gas jet, where the pressure is maximum, and neighboring areas, where the pressure is lower. This reduced pressure gradient strongly the thickness of the liquid adhering to the substrate. Typically, the thickness caused by the strip is the order of several hundred ⁇ m while the thickness final that the spin will leave is less than or equal to ten ⁇ m.
  • pre-spin roller (request JP-A-62 205256 from Sumimoto Métal Ltd.) or projection of a metal jet liquid coming out of the coating bath perpendicularly on the surface of the treated strip (request JP-A-63 109 150 from Kawasaki Steel Corp.).
  • these attempts have limited success, as these methods improve spinning but in some cases suffer from lack of stability. They have been tested several times by the Applicant and it has been found that the pre-spin opposes the free flow of liquid from the blades spin to the coating bath. This results in currents between the pre-spin system and the system proper spin, as well as final variations the thickness of the coating.
  • Another proposal to improve performance by reducing the risk of splashing consists to add a gas injection under the spin blades, to stabilize the flow of liquid to the bath (application JP-A-6 346211 from Nippon Steel Corp.).
  • the strips of cold rolled steel are unwound and brought to high temperature (over 700 ° C) so as to obtain recrystallization which will restore their ductility for further shaping (e.g. stamping body parts).
  • high temperature over 700 ° C
  • a high cooling speed is sometimes sought. It makes it possible to obtain a quenching effect and thereby to increase the strength properties of the sheets (by example, automotive safety parts).
  • Many manufacturers of continuous annealing lines have imagined cool the steel strips in a water bath, the temperature is controlled ("Howaq-Twice", "NKK Quench”). At get out of the bath, the strip should also be wrung out before to be dried and to undergo the end of treatment. Given that the annealing lines operate at very high speed (from 100 to 600m / min) and you want to have only one minimum water to dry, the problem of spinning arises here in the same way as in continuous coating.
  • the present invention aims to provide a spin process allowing to get rid of known drawbacks in the state of the art, in particular those linked to spinning with gas blades or various pre-spin techniques.
  • the present invention has for purpose of effectively controlling the thickness of the coating adhering to the product to be coated, in the process of dip coating.
  • a complementary object of the invention consists to deposit liquid adhering to the product at coating, which has a thickness just necessary or predetermined.
  • a first object of the present invention relates to a method for controlling the thickness of a layer liquid entrained on the surface of an elongated object, preferably a strip or wire, emerging from a bath up, preferably substantially vertically, characterized in that it comprises at the outlet of the bath a spinning operation by means of blades liquid under pressure.
  • said liquid blades are projected through a slit and directed towards the bottom, following a direction making with the surface of the object a theta angle ( ⁇ ) less than 60 ° and preferably between 25 to 45 °.
  • the thickness of the blades of liquid is greater than or equal to 0.3 times that of the liquid driven by the surface of the object in the absence of spin.
  • the invention fully delivers its advantages if the elongated object is a strip and if the speed of the liquid in the blades v lam is greater than a threshold value which is a function of the speed of the strip V strip and the respective thicknesses of liquid t drag carried by the strip when there is no spin and t lam in the spin blades.
  • the following condition is imposed for the speed of the liquid in the blades: v lam . cos (theta)> k. v strip . (1 + 3 (t drag / t lam )), where k is a so-called efficiency coefficient between 0.25 and 2.
  • the features of the invention are compatible with a layout of the liquid blades of the two sides of the strip which is symmetrical.
  • the Liquid slides can be flat, curved and concavity turned upwards, the curvature being preferably in the range of 0.01 to 0.05 meters of boom per meter wide or segmented and have a plurality of sections possibly inclined relative to horizontally.
  • the speed of the liquid in the blades is non-uniform the along the width of the strip.
  • an operation equalizing the thickness of the liquid adhering to the strip after spinning with liquid slides can be achieved by gas blades from gas injection slots operating at a pressure between 0.01 to 0.07 MPa and located above the liquid slides.
  • the entrained liquid layer on the surface of the elongated object is preferably a coating layer consisting of a molten metal deposited on a metal strip in a metallurgical process of dip coating.
  • the metal strip is consisting for example of steel, aluminum, zinc, copper or one of their alloys.
  • the thickness of the metal strip is between 0.15 and 5 mm.
  • the invention relates primarily application to a dip coating process which is a continuous process with a running speed of the band preferably between 2 and 10 m / s.
  • the invention it is possible to obtain a thickness of the metallic coating layer after spin between 3 and 20 ⁇ m.
  • the liquid layer entrained in the surface of the elongated object is a layer of water covering the surface of a metal strip at the end of a bath temperature controlled water.
  • the spinning operation at the outlet of the water bath precedes a water drying operation remaining on the strip.
  • Another object of the present invention relates to an installation for implementing the method to control the thickness of a liquid layer entrained in the surface of an elongated object, as described above.
  • Figure 1.a schematically represents a general wringing device a steel strip by gas blades, depending on the condition of the technical.
  • Figure 1.b graphically represents a modeling of evolution, according to experimental results, film thickness water entrained on one side of a steel strip emerging of a water bath, when the speed of the belt increases (continuous annealing process).
  • Figure 2.a shows schematically a device for wringing a steel strip using blades liquid according to the present invention.
  • Figure 2.b shows graphically and schematically the effect of the speed of the liquid in the blades on the spin efficiency, according to the invention.
  • FIGS.c to 2.e show schematically three different spin configurations according to the invention, noted during the tests carried out.
  • Figures 3.a to 3.d show schematically possible sections of the blade of spin according to the invention.
  • the object of the present invention is to solve the problem of controlling so effective a thickness of a first liquid adhering to a strip or wire, preferably metallic, coming out of a dip coating bath for example using a spinning purely liquid.
  • the fluid blade of a significant amount of movement of so that the latter is able to train with it the liquid adhering to the strip on leaving the bath and leave only a controlled amount of adherent liquid.
  • the spin liquid blades are directed from top to bottom, the strip emerging from the bath upwards. They form a slight angle with the strip (or the wire). In in other words, they are relatively close to the vertical direction. As shown in Figure 2.a, the angle theta ( ⁇ ) between the direction essentially vertical followed by the strip emerging from the bath and each liquid spin blades is less than 60 ° and preferably between 25 and 45 °.
  • the thickness of the liquid t lam , in the wiper blades, is at least equal to 0.3 times the thickness of liquid t drag , carried by the strip at the exit of the bath on each of its faces, when there is no spin. As explained above, this latter thickness is mainly a function of the viscosity of the coating liquid and the speed of the strip.
  • the speed of the liquid v lam in the spinning blades is greater than a threshold which is a function of the speed of the strip v strip and the thicknesses of liquid t drag carried by the strip, when there is no spin and t lam in the spin blades.
  • This threshold can be expressed by inequality: v lam. cos (theta)> k. v strip (1 + 3 (t drag / t lam )), where k is an efficiency coefficient between 0.25 and 2.
  • Figure 2.a shows a diagram of liquid spin wringing arrangement.
  • a band 1 emerges vertically from a bath 2 and is wrung out by symmetrical blades 8 and 8 'respectively, relative to the bandaged.
  • the blades make an angle ⁇ with the vertical.
  • Their action has the effect of reducing the adherent thickness of a initial value 6 to a final value 9.
  • Figure 2.b graphically shows the schematic effect of the speed of the liquid in the blades on the spin efficiency, evaluated by the ratio between the thickness at the outlet after spin, everything and that which would be entrained s there was no spin, t drag .
  • Figures 2.c, 2.d and 2.e show three different spin situations which were noted in tests.
  • the strip 1 which has just emerged from a liquid bath is spun by a strip of liquid 8. Only one side is shown in the figures, it being understood that the behavior is symmetrical on the two sides.
  • the wiper blade In the case of Figure 2.c, the wiper blade is perpendicular to the strip and has practically no effect.
  • the wiper blade In the case of Figure 2.d, the wiper blade is inclined and directed from top to bottom but the product V lam . cos ⁇ is not sufficient (see formula above) and the spin effect is weak.
  • FIG. 2.e which is the one preferentially targeted by the present application, the wiper blade is inclined, directed from top to bottom and the product V lam . cos ⁇ is high enough: the spin effect is marked.
  • the spin blade projected on each side is not necessarily flat and continuous. She can advantageously be curved and for reasons techniques consist of discontinuous segments.
  • Figures 3.a, 3.b, 3.c and 3.d show each time a particular cross section of the blade spin, in the context where a strip 1 emerges vertically of a liquid bath 2.
  • the section of the slide is shown in Figures 3.a-d by the sound profile 10 impact on the tape.
  • the spin blade is curved and continuous: we take advantage of this shape to push excess liquid to the edges, too called “shores", and from there eliminate it from the surface of the bandaged.
  • the curvature i.e. the concavity
  • the curvature is directed upwards and its value is between 0 and 0.1 meters of arrow per meter of width and preferably close to 0.05 meter of boom per meter of width.
  • the spin blade is segmented into three straight segments, two of which are located at the ends are inclined.
  • the local speed in the blade depends on the position on the width according to the same law as above.
  • the blade is divided into a series of straight and inclined segments.
  • This layout allows design sprinklers to be used classic which from a circular orifice are capable of generating an almost flat blade (catalog, Lechler GmbH, D-72544 Metzingen, Germany).
  • the local speed in the blade depends on the position across the width according to the same law as above.
  • the spin blades are of the "coherent" type, that is to say that they keep their shape and their momentum density and therefore their spin efficiency, even after leaving the slots by which they are projected. This consistency is given in a known manner by the shape of the slots.
  • the liquid slides are advantageously same composition as the bath whose strip (wire) emerges.
  • the liquid that will form the blades is sucked into the bath by pumps and then sent under pressure towards the slots from where the blades will be projected.
  • a gas injection slit directed towards the strip may be provided above the impact lines of the liquid slides. It will preferably work at a pressure of the order of 0.01 to 0.07 MPa. She permits equalize the adhesive thickness after liquid spinning and thus contributes to a very high homogeneity in particular when the liquid slide is segmented.
  • a gas blanket can be created at approximately blades by gas injection and use of a screen to keep this atmosphere close to the blades. This provision is particularly interesting in the case an oxidizable liquid in the air, such as zinc liquid used for coatings.

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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)
EP04447055A 2003-03-12 2004-03-05 Kontrolle der Dicke einer flüssigen Oberflächenschicht auf einem, aus einem Schmelzbad austretendem, langgestrecktem Gegenstand. Withdrawn EP1457581A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE200300153 2003-03-12
BE2003/0153A BE1015409A3 (fr) 2003-03-12 2003-03-12 Controle de l'epaisseur d'une couche liquide a la surface d'un objet allonge emergeant d'un bain.

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EP1457581A1 true EP1457581A1 (de) 2004-09-15

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EP04447055A Withdrawn EP1457581A1 (de) 2003-03-12 2004-03-05 Kontrolle der Dicke einer flüssigen Oberflächenschicht auf einem, aus einem Schmelzbad austretendem, langgestrecktem Gegenstand.

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EP (1) EP1457581A1 (de)
BE (1) BE1015409A3 (de)

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB352911A (en) * 1929-01-10 1931-07-16 Georges Boutefeu A process for plating with tin and other materials
GB588281A (en) * 1945-02-07 1947-05-19 Warren Worthington Procedure and apparatus for continuously coating strip metal
US2536186A (en) * 1946-05-02 1951-01-02 John D Keller Method of wiping liquid metal coatings
US3112226A (en) * 1960-06-17 1963-11-26 Worcester Automatic Machine Co Apparatus for coating wire
US3727895A (en) * 1969-06-26 1973-04-17 Australian Wire Ind Pty Cooling coated wires, strips and the like
US3782326A (en) * 1971-03-16 1974-01-01 Australian Wire Ind Pty Primary water quench
US3853306A (en) * 1971-12-28 1974-12-10 Bethlehem Steel Corp Apparatus for quenching molten coatings
US3995587A (en) * 1973-06-28 1976-12-07 General Electric Company Continuous casting apparatus including Mo-Ti-Zr alloy bushing
GB2009250A (en) * 1977-11-30 1979-06-13 British Steel Corp Improvements in the Surface Treatment of Coated Metallic Strip
JPS5528363A (en) * 1978-08-22 1980-02-28 Nippon Steel Corp Manufacture of minimum spangle galvanized sheet
GB2028875A (en) * 1978-05-22 1980-03-12 British Steel Corp Production of Minimum Spangle in Galvanised Sheet
JPS55113868A (en) * 1979-02-26 1980-09-02 Kokoku Kousensaku Kk Manufacture of hot aluminum dip coated steel wire and cooler therefor
US4282273A (en) * 1978-04-10 1981-08-04 Messer Griesheim Gmbh Process and apparatus for galvanizing a wire
JPS60258458A (ja) * 1984-06-06 1985-12-20 Mitsubishi Heavy Ind Ltd 溶融めつき装置
JPS63109150A (ja) * 1986-10-24 1988-05-13 Kawasaki Steel Corp 溶融金属めつきにおけるめつき鋼帯の後処理方法
EP0395759A1 (de) * 1988-09-29 1990-11-07 Nisshin Steel Co., Ltd. Vorrichtung zur herstellung eines feuerbeschichteten stahlbleches mit geringer flitterbildung
JPH0372061A (ja) * 1989-08-10 1991-03-27 Kiyousan Densen Kk 金属線溶融めっき方法

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB352911A (en) * 1929-01-10 1931-07-16 Georges Boutefeu A process for plating with tin and other materials
GB588281A (en) * 1945-02-07 1947-05-19 Warren Worthington Procedure and apparatus for continuously coating strip metal
US2536186A (en) * 1946-05-02 1951-01-02 John D Keller Method of wiping liquid metal coatings
US3112226A (en) * 1960-06-17 1963-11-26 Worcester Automatic Machine Co Apparatus for coating wire
US3727895A (en) * 1969-06-26 1973-04-17 Australian Wire Ind Pty Cooling coated wires, strips and the like
US3782326A (en) * 1971-03-16 1974-01-01 Australian Wire Ind Pty Primary water quench
US3853306A (en) * 1971-12-28 1974-12-10 Bethlehem Steel Corp Apparatus for quenching molten coatings
US3995587A (en) * 1973-06-28 1976-12-07 General Electric Company Continuous casting apparatus including Mo-Ti-Zr alloy bushing
GB2009250A (en) * 1977-11-30 1979-06-13 British Steel Corp Improvements in the Surface Treatment of Coated Metallic Strip
US4282273A (en) * 1978-04-10 1981-08-04 Messer Griesheim Gmbh Process and apparatus for galvanizing a wire
GB2028875A (en) * 1978-05-22 1980-03-12 British Steel Corp Production of Minimum Spangle in Galvanised Sheet
JPS5528363A (en) * 1978-08-22 1980-02-28 Nippon Steel Corp Manufacture of minimum spangle galvanized sheet
JPS55113868A (en) * 1979-02-26 1980-09-02 Kokoku Kousensaku Kk Manufacture of hot aluminum dip coated steel wire and cooler therefor
JPS60258458A (ja) * 1984-06-06 1985-12-20 Mitsubishi Heavy Ind Ltd 溶融めつき装置
JPS63109150A (ja) * 1986-10-24 1988-05-13 Kawasaki Steel Corp 溶融金属めつきにおけるめつき鋼帯の後処理方法
EP0395759A1 (de) * 1988-09-29 1990-11-07 Nisshin Steel Co., Ltd. Vorrichtung zur herstellung eines feuerbeschichteten stahlbleches mit geringer flitterbildung
JPH0372061A (ja) * 1989-08-10 1991-03-27 Kiyousan Densen Kk 金属線溶融めっき方法

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 004, no. 061 (C - 009) 8 May 1980 (1980-05-08) *
PATENT ABSTRACTS OF JAPAN vol. 004, no. 174 (C - 033) 2 December 1980 (1980-12-02) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 136 (C - 347) 20 May 1986 (1986-05-20) *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 353 (C - 530) 21 September 1988 (1988-09-21) *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 231 (C - 0840) 12 June 1991 (1991-06-12) *

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