EP1215300B1 - Racleur pour procédé de métallisation au trempé - Google Patents

Racleur pour procédé de métallisation au trempé Download PDF

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Publication number
EP1215300B1
EP1215300B1 EP01128698A EP01128698A EP1215300B1 EP 1215300 B1 EP1215300 B1 EP 1215300B1 EP 01128698 A EP01128698 A EP 01128698A EP 01128698 A EP01128698 A EP 01128698A EP 1215300 B1 EP1215300 B1 EP 1215300B1
Authority
EP
European Patent Office
Prior art keywords
molten metal
inductor
flow
article
metal
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.)
Expired - Lifetime
Application number
EP01128698A
Other languages
German (de)
English (en)
Other versions
EP1215300A3 (fr
EP1215300A2 (fr
Inventor
Leopold Barleon
Rudolf Stockmeyer
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.)
BFI VDEH Institut fuer Angewandte Forschung GmbH
Original Assignee
BETR FORSCH INST ANGEW FORSCH
BFI VDEH Institut fuer Angewandte Forschung GmbH
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
Priority claimed from DE10128710A external-priority patent/DE10128710A1/de
Application filed by BETR FORSCH INST ANGEW FORSCH, BFI VDEH Institut fuer Angewandte Forschung GmbH filed Critical BETR FORSCH INST ANGEW FORSCH
Publication of EP1215300A2 publication Critical patent/EP1215300A2/fr
Publication of EP1215300A3 publication Critical patent/EP1215300A3/fr
Application granted granted Critical
Publication of EP1215300B1 publication Critical patent/EP1215300B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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 invention relates to a method and apparatus for stripping excess molten metal, especially zinc melts in hot dip and takes the priority of the German patent applications 100 61 869.3 and 101 28 710.0, to which reference is made.
  • thin uniform metal layers i.a. also applied zinc layers by means of various methods on metal strips.
  • the strip first passes through a molten zinc melt and is subsequently drawn off at the top. Due to its viscosity, the melt adheres to the metal strip above the metal bath level and thus forms a freely adhering zinc layer around the metal strip.
  • This zinc layer is usually much thicker than needed - so it can z.T. up to 20 times the required layer thickness - and must therefore be traced back to the respective desired layer thickness.
  • this method has the disadvantage that at most zinc layers of 30 to 40 g / m 2 per band side can be produced, although in some cases even thinner layers are required. In addition, there may be clogging of the gap nozzles when the tape abuts against the nozzles. Another disadvantage is that forms undesirable slag just in the use of air. There are also problems of noise pollution and the formation of zinc dust.
  • Electromagnetic scrapers have been developed to avoid these disadvantages (Malmendier, M., Schyns: Improvement in Zinc and Zinc Alloy Coating - Measurement and Control European Commission, Contract No. 7210-GB / 207/409/604/810, EUR 18802) EN, 1999; Lloyd-Jones, C., HA Barker, VJ Worner: Investigation into magnetic wiping techniques as alternative to gas wiping on hot dip galvanizing lines Ironmaking and Steelmaking 1998, Vol. 25). Such an electromagnetic stripper is also known from EP 0 681 036 B1.
  • inductors are arranged with electric coils above the melt. But you can also partially immerse in the melt.
  • the current applied in the coils generates a magnetic field, which in turn induces a current in the molten zinc.
  • Excess metal is first discharged with the tape up and is subsequently stripped off magnetically. The effect thus produced corresponds in principle to that of the pneumatic scrapers.
  • the known electromagnetic stripping require a very high magnetizing current and also have the particular disadvantage that layers in the minimum of 90 g / m 2 can be produced.
  • wiping nozzles which adjust the applied metal layer in a conventional manner.
  • This system is disadvantageous since the molten metal to be applied has to be conveyed over long distances and threatens to cool down.
  • Patent Abstract of Japan for JP 111 72400 A and GB 1 221 905 and Patent Abstract of Japan for JP 2000 212714 A it is known to exert influence on a metal melt applied to the metal strip by means of magnets provided on rotating rolls in order to adjust the applied metal layer ,
  • the invention is therefore based on the object to provide a method for stripping metal melts, in particular for producing thin metal layers, which largely overcomes the disadvantages of the prior art. Likewise, an apparatus for carrying out the method is to be provided.
  • the method according to the invention is based on the idea of accelerating the downwardly directed melt flow starting in the removal of an article, for example a belt, in a direction opposite to the upward movement and guiding the accelerated melt stream back against the belt in the form of a so-called free jet.
  • the melt flows down in countercurrent to the ascending belt. By this countercurrent, the boundary layer, i. reduces the metal layer on the tape.
  • the inventive method thus uses the kinetic energy of the flow to strip superfluous melt. Accordingly, it represents a dynamic stripping compared to the known methods, while those are more static, since the boundary layer is not flown, but only volume forces are coined in the boundary layer.
  • the acceleration of the melt stream and the subsequent utilization of the kinetic energy have the advantage that it is possible to achieve much higher energy densities on the belt.
  • the generation and the acceleration of the melt stream (or volume flow) can be done by magneto-hydrodynamic (magneto-hydrodynamic wipers (MHD)).
  • MHD magneto-hydrodynamic wipers
  • a magnetic field and the current are not impressed separately, as is customary in the known methods, but only a magnetic field is impressed. This induces the current in the melt.
  • it is a magnetic rotating field.
  • the magneto-hydrodynamic stripping is based on the following principle:
  • Inductors can induce voltages in the molten metal and in the strip and thus generate an electrical flow field. In this case, together with the resulting magnetic field, a force field in the metal bath, in the metal layer and in the band arise.
  • the direction of force in the region between the inductors has substantially downwards and is opposite to the direction of the rising band.
  • the retention of the metal can thus be largely below and above the metal bath level, wherein the preferred range for the retention of the metal is in the amount of the metal bath level.
  • Several sub-processes play a role, whereby below the bath level, a downwardly directed circulating flow field can arise in the molten metal, which - in the case of a narrow cross-section - can have an increased speed.
  • the acceleration of the melt flow can take place in a flow gap (or flow channel) which lies between an inductor used to generate the rotating field and a housing surrounding the inductor.
  • a flow gap or flow channel
  • the melt stream can enter the flow gap and then circulate it at a high rotational speed relative to the belt speed before being discharged from the outlet of the gap at the metal bath level.
  • To further increase the speed of the outlet may be formed in the form of a slit nozzle.
  • the use of a flow channel has the advantage that the melt comes as little as possible into contact with the ambient air and so unwanted slagging can be reduced. If the stripping, for example, take place on a belt, this arrangement can be mounted on both sides of the belt.
  • the volume forces are impressed in the flow channel and converted into flow velocity. This acts on the boundary layer between the molten metal and the object.
  • the angle between the free jet flowing from the flow gap against the melt and the strip should be kept as small as possible, so that an unwanted vortex formation in particular in the critical space, i. the space above the impingement of the free jet on the tape is avoided as far as possible.
  • This so-called angle of attack is preferably less than 20 degrees.
  • the stripping takes place by means of the method according to the invention at the exit point of the object from the molten metal.
  • the device for stripping all or partially immerse in the melt.
  • the housing surrounding the inductor can be ceramic coated inside and outside.
  • the housing may be ferromagnetic, so that it can form a magnetic inference for the rotating field. This has the advantage of reducing the required magnetizing current.
  • the housing may have in the direction of the bandwidth a plurality of variable variable air gaps in the form of slidable segments through which the magnetic flux can be selectively changed. This leads to an influence on the flow velocity of the melt at the discharge nozzle (outlet), so that it is possible to adjust the thickness of the metal layer over the width of the object.
  • the layer thickness at individual width locations can thus be adjusted via the strength of the magnetic field with the aid of the air gaps.
  • the inductor preferably has a width that is greater than the respective bandwidth. It can consist of a laminated iron package with slots for an electrical winding. According to the invention, the inductors can be positioned either horizontally or vertically. The windings of the inductors should be arranged so that a rotating magnetic field (rotating field) is formed. Advantageously, a material with high electrical conductivity and a temperature resistance above 600 ° C is used. The band gap can be a few millimeters. If the Inductor consists of an iron package, this can represent the so-called yoke for the inference of the molten metal.
  • the arrangement 1 of FIG. 1 consists of two inductors 2 and 3, which partially dip into a bath 4 of molten zinc 5. They are arranged at a height h2 above the bath level.
  • the windings of the inductors are arranged so that a rotating magnetic field 7 (rotating field) is formed, whose direction of force is opposite to the direction of the ascending belt.
  • the stripper according to the invention of Fig. 2 consists of a cylindrical ferromagnetic inductor 10, the surface of which is ceramic coated. It has a multi-phase winding 20 which is distributed over its entire circumference. The winding receives impressed currents with adjustable current and frequency. The winding generates a magnetic rotating field.
  • the inductor is formed by a likewise cylindrical ferromagnetic housing 30 surrounded, which is ceramic coated inside and out. It carries radially displaceable housing segments 40 for setting an additional air gap I.
  • a flow gap 50 Between the housing and inductor extends annularly a flow gap 50 through which liquid molten metal at high circulation speed relative to the speed V B of the band runs. The flow flows in the image counterclockwise.
  • the flow gap is opened to the belt via an outlet 60 and an inlet 70.
  • the inlet is located below the outlet close to the belt.
  • Inlet and outlet have an angle ⁇ E and ⁇ A to the bathroom mirror 90 on. From the outlet of the free jet 110 exits. It impinges on the upwardly moving belt 80 under the angle of attack and with the outflow velocity V. The angle of attack and the inlet to the flow gap make it possible to keep the critical area 100 as free as possible of swirling.
  • the axis of the inductor has a distance A to the band.
  • the inductor is immersed in the melt with the depth T.

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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)
  • Manufacture And Refinement Of Metals (AREA)
  • Liquid Deposition Of Substances Of Which Semiconductor Devices Are Composed (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (18)

  1. Procédé destiné à racler des masses fondues métalliques (5) d'objets (6 ; 80) pour générer des couches métalliques comprenant les étapes suivantes :
    - immersion de l'objet (6 ; 80) dans la masse fondue métallique (5) ;
    - déplacement ascendant de l'objet (6 ; 80) à l'extérieur de la masse fondue métallique (5);
    - accélération d'un courant de masse fondue s'écoulant vers le bas sur l'objet (6 ; 80) dans une direction opposée au mouvement ascendant de l'objet ;
    - projection du courant de masse fondue accéléré contre l'objet (6 ; 80),
    caractérisé par une génération d'un champ tournant magnétique agissant à l'intérieur de la masse fondue métallique par au moins un inducteur (1 ; 2, 3), qui est immergé au moins en partie dans la masse fondue métallique, afin d'accélérer le courant de masse fondue.
  2. Procédé selon la revendication 1, caractérisé en ce que l'accélération s'effectue au niveau du point où l'objet (6 ; 80) sort de la masse fondue métallique ou à proximité de celui-ci.
  3. Procédé selon la revendication 2, caractérisé en ce que le courant de masse fondue est guidé à travers une fente d'écoulement (50).
  4. Procédé selon la revendication 3, caractérisé en ce que la vitesse (V) du courant de masse fondue dans la fente d'écoulement (50) est régulée par des fentes d'aération (40) variables.
  5. Procédé selon la revendication 3 ou 4, caractérisé en ce que le courant de masse fondue quitte la fente d'écoulement (50) par l'intermédiaire d'une buse (60).
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la masse métallique fondue accélérée est projetée sur l'objet selon un angle de projection ou d'attaque inférieur à 20 degrés.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la régulation de l'épaisseur de la couche de métal s'effectue en modifiant un des paramètres suivants : profondeur d'immersion (h2 ; T) de l'inducteur (1 ; 2, 3) ; distance (A) entre l'inducteur et l'objet (6 ; 80) ; intensité du courant et/ou fréquence sur l'inducteur (1 ; 2, 3).
  8. Dispositif destiné à racler des masses fondues métalliques (5) d'un objet (6 ; 80) au moyen d'au moins un inducteur (1 ; 2, 3) qui est immergé au moins en partie dans la masse fondue métallique (5), caractérisé en ce que l'inducteur comprend un enroulement à phases multiples destiné à générer un champ rotatif magnétique (7) agissant à l'intérieur de la masse fondue métallique.
  9. Dispositif selon la revendication 8, caractérisé en ce que l'inducteur comprend une surface revêtue de céramique.
  10. Dispositif selon l'une quelconque des revendications 8 ou 9, caractérisé en ce que l'inducteur (1 ; 2, 3) est composé d'une masse métallique ou d'une masse de plaques métalliques.
  11. Dispositif selon l'une quelconque des revendications 8 à 10, caractérisé en ce que l'inducteur (1 ; 2, 3) est entouré par un boîtier (30).
  12. Dispositif selon la revendication 11, caractérisé par un canal d'écoulement (50) entre l'inducteur (1 ; 2, 3) et le boîtier (30).
  13. Dispositif selon la revendication 12, caractérisé par un orifice d'admission (70) et un orifice d'évacuation (60) du canal d'écoulement (50).
  14. Dispositif selon la revendication 13, caractérisé en ce que l'orifice d'admission occupe ou s'étend sur un angle inférieur à 20 degrés et l'orifice d'évacuation un angle inférieur à 20 degrés par rapport au niveau du bain (90).
  15. Dispositif selon l'une quelconque des revendications 11 à 14, caractérisé par des segments de boîtier (40).
  16. Dispositif selon la revendication 15, caractérisé en ce que les segments de boîtier (40) sont mobiles dans le sens radial.
  17. Utilisation d'un dispositif selon l'une quelconque des revendications 8 à 16, destiné à racler une masse fondue métallique d'un corps longitudinal (6).
  18. Utilisation d'un dispositif selon l'une quelconque des revendications 8 à 16, destiné à racler une masse fondue de zinc d'une bande métallique (6 ; 80).
EP01128698A 2000-12-12 2001-12-01 Racleur pour procédé de métallisation au trempé Expired - Lifetime EP1215300B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10061869 2000-12-12
DE10061869 2000-12-12
DE10128710 2001-06-13
DE10128710A DE10128710A1 (de) 2000-12-12 2001-06-13 Abstreifer für Schmelztauchverfahren

Publications (3)

Publication Number Publication Date
EP1215300A2 EP1215300A2 (fr) 2002-06-19
EP1215300A3 EP1215300A3 (fr) 2003-10-08
EP1215300B1 true EP1215300B1 (fr) 2006-05-10

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ID=26007944

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01128698A Expired - Lifetime EP1215300B1 (fr) 2000-12-12 2001-12-01 Racleur pour procédé de métallisation au trempé

Country Status (3)

Country Link
EP (1) EP1215300B1 (fr)
AT (1) ATE325904T1 (fr)
DE (1) DE50109747D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5194613B2 (ja) * 2007-07-30 2013-05-08 Ｊｆｅスチール株式会社 溶融金属めっき鋼帯の製造装置及び溶融金属めっき鋼帯の製造方法
JP5194612B2 (ja) * 2007-07-30 2013-05-08 Ｊｆｅスチール株式会社 溶融金属めっき鋼帯の製造装置及び溶融金属めっき鋼帯の製造方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2364904A (en) * 1940-11-13 1944-12-12 Wean Engineering Co Inc Method for tinning strip
US2377632A (en) * 1942-09-16 1945-06-05 Wean Engineering Co Inc Method and apparatus for coating strip
JPS5534610A (en) * 1978-08-30 1980-03-11 Nisshin Steel Co Ltd Continuous hot dipping apparatus
US4287238A (en) * 1980-04-11 1981-09-01 Bethlehem Steel Corporation Protective atmosphere gas wiping apparatus and method of using
JPS60258458A (ja) * 1984-06-06 1985-12-20 Mitsubishi Heavy Ind Ltd 溶融めつき装置
JPH02243751A (ja) * 1989-03-16 1990-09-27 Sumitomo Metal Ind Ltd 連続溶融めっきのワイピング方法
JP2836976B2 (ja) * 1991-02-05 1998-12-14 三菱重工業株式会社 溶融金属めっき装置
JP2837037B2 (ja) * 1992-08-04 1998-12-14 三菱重工業株式会社 溶融金属めっき装置
JP2837059B2 (ja) * 1993-04-22 1998-12-14 三菱重工業株式会社 溶融金属めっき装置
JP2643096B2 (ja) * 1994-11-14 1997-08-20 三菱重工業株式会社 溶融金属めっき装置
JP3738547B2 (ja) * 1997-11-27 2006-01-25 Ｊｆｅスチール株式会社 溶融めっき設備の空中浮揚ポット

Also Published As

Publication number Publication date
DE50109747D1 (de) 2006-06-14
EP1215300A3 (fr) 2003-10-08
EP1215300A2 (fr) 2002-06-19
ATE325904T1 (de) 2006-06-15

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