EP1483424B1 - Vorrichtung zur schmelztauchbeschichtung von metallsträngen - Google Patents

Vorrichtung zur schmelztauchbeschichtung von metallsträngen Download PDF

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Publication number
EP1483424B1
EP1483424B1 EP03743812A EP03743812A EP1483424B1 EP 1483424 B1 EP1483424 B1 EP 1483424B1 EP 03743812 A EP03743812 A EP 03743812A EP 03743812 A EP03743812 A EP 03743812A EP 1483424 B1 EP1483424 B1 EP 1483424B1
Authority
EP
European Patent Office
Prior art keywords
coils
metal
metal strip
correction
movement 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.)
Expired - Lifetime
Application number
EP03743812A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1483424A1 (de
Inventor
Frank Bergmann
Michael Zielenbach
Walter Trakowski
Olaf Norman Jepsen
Holger Behrens
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.)
SMS Siemag AG
Original Assignee
SMS Demag AG
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Publication date
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1483424A1 publication Critical patent/EP1483424A1/de
Application granted granted Critical
Publication of EP1483424B1 publication Critical patent/EP1483424B1/de
Anticipated expiration legal-status Critical
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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
    • C23C2/24—Removing excess of molten coatings; Controlling or regulating the coating thickness using magnetic or electric fields

Definitions

  • the invention relates to a device for hot-dip coating of metal strands, in particular of steel strip, in which the metal strand can be guided vertically through a container receiving the molten coating metal and through an upstream guide channel.
  • an electromagnetic inductor is arranged in the region of the guide channel, which induces induction currents for retaining the coating metal in the container by means of an electromagnetic traveling field in the coating metal, which exert an electromagnetic force in interaction with the traveling electromagnetic field, wherein the inductor has at least two main coils in the direction of movement of the metal strand are arranged successively, as well as having at least two correction coils for position control of the metal strand in the guide channel in the direction normal to the surface of the metal strand, which are also arranged successively in the direction of movement of the metal strand.
  • the belts are introduced from above into the dip-coating bath in a plunger.
  • the coating metal is in liquid form and gravity is to be used with blowers to set the coating thickness, but subsequent processes prohibit tape contact until the coating metal solidifies completely, the tape in the coating vessel must be deflected in the vertical direction. This happens with a roller that runs in liquid metal. Due to the liquid coating metal, this roller is subject to heavy wear and is the cause of downtimes and thus failures in production.
  • the known dip coating systems also have limit values in the coating speed. These are the limit values for the operation of the wiping nozzle, the cooling processes of the continuous metal strip and the heating process for setting alloy layers in the coating metal. This leads to the case that on the one hand, the maximum speed is generally limited and on the other certain metal bands can not be driven at the maximum speed possible for the system.
  • non-ferromagnetic metal tapes are indeed possible, but there are problems with substantially ferromagnetic steel strips that they are drawn in the electromagnetic seals by the ferromagnetism to the channel walls, whereby the tape surface is damaged. Furthermore, it is problematic that the coating metal is heated by the inductive fields inadmissible.
  • the position of the passing ferromagnetic steel strip through the guide channel between two traveling field inductors is an unstable equilibrium. Only in the middle of the guide channel is the sum of the magnetic forces of attraction acting on the tape zero. As soon as the steel strip is deflected from its center position, it gets closer to one of the two inductors, while it moves away from the other inductor. Causes of such a deflection may be simple flatness errors of the tape. To call it are any kind of tape waves in the direction, seen across the width of the band (Centerbuckles, Quarterbuckles, edge waves, flutter, twisting, crossbow, S-shape, etc.). The magnetic induction, which is responsible for the magnetic attraction decreases according to an exponential function with the distance from the inductor in their field strength.
  • the attraction force decreases with the square of the induction field strength with increasing distance from the inductor. For the deflected band, this means that with the deflection in one direction, the attractive force to one inductor expands exponentially, while the restoring force from the other inductor exponentially decreases. Both effects are self-reinforcing, so the balance is unstable.
  • DE 195 35 854 A1 and DE 100 14 867 A1 give hints.
  • additional correction coils are provided in addition to the coils for generating the electromagnetic traveling field, which are in communication with a control system and ensure that the metal strip is retrieved when departing from the central position in this.
  • the invention is therefore based on the object, a device for hot dip coating of metal strands of the type mentioned in such a way that the mentioned disadvantages are overcome. It should be possible in particular to effectively hold the metal strip in the middle of the guide channel.
  • This object is achieved in that at least a portion of the correction coils, viewed in the direction of movement of the metal strand, are perpendicular to the direction of movement and perpendicular to the direction normal to the surface of the metal strand offset from each other.
  • the correction coils viewed in the direction of movement of the metal strand, arranged in at least two rows, preferably in six rows. Furthermore, each row can have at least two correction coils.
  • the center of a correction coil in a subsequent row viewed in the direction of movement of the metal strand, is arranged exactly between two centers of the control coils of the preceding row.
  • the embodiment of the invention is achieved that due to the staggered arrangement of the correction coils from row to row (viewed in the direction of movement of the metal strand), the magnetic fields of traveling field coils for sealing the guide channel and the correction coils for controlling the band position in the guide channel overlap to a common field, the both seals and regulates. With the invention it is avoided that occur at the boundaries of the correction coils in a series field cancellations by canceling magnetic fields that would otherwise no longer make it possible to influence the metal strip in the guide channel for the purpose of its controlled positioning.
  • the induction fields are superimposed, and the unwanted effect of the field cancellation on the side is compensated for by the offset correction coil underneath.
  • the effect is no longer problematic, since the control range for the liquid column of the metal is in the upper half of the guide channel and thus does not bother.
  • At least one correction coil viewed in the direction of movement of the metal strand, is arranged at the same height as a main coil.
  • the electromagnetic inductor for receiving main coils and correction coils has a number of grooves which run perpendicular to the direction of movement of the metal strand and perpendicular to the normal direction. It can be advantageously provided that in each groove at least a part of at least one main coil and at least one correction coil is arranged. Furthermore, it has been found to be advantageous that the part of the correction coil arranged in the groove is arranged closer to the metal strand than the respective part of the main coil.
  • the supply of both the main coils and the correction coils with alternating current is of particular importance.
  • Means are provided, with which the main coils can be supplied with 3-phase alternating current. It is particularly advantageous if a total of six in the direction of movement of the metal strand successively arranged main coils are arranged (ie six rows), which are supplied with offset by 60 ° phased three-phase current.
  • the in-phase supply of the main and correction coils can preferably be a power supply with a pulse synchronization via optical fibers used.
  • Such a configuration of the device makes it possible for the correction coils to be operated in common mode with the traveling field.
  • the traveling field inductors usually three phases of a rotating field are used; for the correction coils, the respective one phase of the main coil, before which the correction coil is located, is sufficient.
  • the power supply of the two inductors on both sides of the metal strand can be used for the traveling field 3-phase frequency converter;
  • the correction coils one-phase frequency converters suffice, one for each correction coil.
  • An essential importance is the synchronization of the individual frequency converters. This is possible in a particularly simple manner with said impulse synchronization via optical waveguide, which is preferably recommended because of the strong magnetic fields and their stray fields.
  • the position of the continuous steel strip can be detected by induction field sensors, which are operated with a weak measuring field of preferably high frequency. For this purpose, a higher-frequency voltage with low power is superimposed on the traveling field tracks. The higher frequency voltage has no influence on the seal; In the same way, this does not lead to any heating of the coating metal or steel strip.
  • the higher-frequency induction can be filtered out of the strong signal of the normal seal and then provides a signal proportional to the distance from the sensor. With this, the position of the belt in the guide channel can be detected and regulated.
  • FIG. 1 shows the principle of hot-dip coating of a metal strand 1, in particular a steel strip.
  • the metal strand 1 to be coated enters vertically from below into the guide channel 4 of the coating installation.
  • the guide channel 4 forms the lower end of a container 3, which is filled with liquid coating metal 2.
  • the metal strand 1 is guided vertically upward in the direction of movement X. So that the liquid coating metal 2 can not leak from the container 3, an electromagnetic inductor is arranged in the region of the guide channel 4. This consists of two halves 5a and 5b, one of which is arranged laterally of the metal strand 1. In the electromagnetic inductor 5, an electromagnetic traveling field is generated, which retains the liquid coating metal 2 in the container 3 and thus prevents it from leaking.
  • the exact structure of the electromagnetic inductor 5 can be seen in Figures 2 and 3. Shown is only one of the two symmetrical inductors 5a, 5b, which are arranged on both sides of the metal strand 1. As shown in FIG. 2, the metal strand 1 moves upward in the direction of movement X past the inductor 5 a. To generate the electromagnetic traveling field, the inductor 5a is equipped with a total of six main coils 6. These extend over the entire width of the inductor 5a (see FIG. 3). The main coils 6 are arranged in grooves 10 which are incorporated in the metallic base body of the inductor 5a. To the right of Figure 2, the current directions are entered for a total of five line sections of the main coils 6, as they either emerge from the plane or enter into the drawing level.
  • correction coils 7 are arranged in the inductors 5a, 5b.
  • a plurality of correction coils 7 are positioned side-by-side in each of the six rows 8 ', 8 ", 8"', 8 "", 8 ""', 8 “””in two adjacent grooves 10 are arranged over the entire width of the inductor 5a extending main coil 6 and a plurality of juxtaposed correction coils 7.
  • FIG. 4 shows the phase sequence of the 3-phase three-phase current, as it is present in the six main coils 6 outlined.
  • the three phases are labeled R, S and T.
  • the phase sequence results in R, -T, S, -R, T, -S.
  • the respective correction coils 7 must be driven with the same phase present in the main coil 6, in front of which the correction coil 7 is arranged.
  • the main coils 6 for the generation of the traveling field are thus driven with three phases of a rotating field, while the correction coils 7 are each supplied with only one phase.
  • the realization of a supply of the coils 6 and 7 with phase-directed current is accomplished by means of suitable and well-known frequency converter. These must be synchronized accordingly, which is particularly suitable for pulse synchronization via optical fibers.
EP03743812A 2002-03-09 2003-02-20 Vorrichtung zur schmelztauchbeschichtung von metallsträngen Expired - Lifetime EP1483424B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10210429 2002-03-09
DE10210429A DE10210429A1 (de) 2002-03-09 2002-03-09 Vorrichtung zur Schmelztauchbeschichtung von Metallsträngen
PCT/EP2003/001722 WO2003076681A1 (de) 2002-03-09 2003-02-20 Vorrichtung zur schmelztauchbeschichtung von metallsträngen

Publications (2)

Publication Number Publication Date
EP1483424A1 EP1483424A1 (de) 2004-12-08
EP1483424B1 true EP1483424B1 (de) 2006-05-31

Family

ID=27762823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03743812A Expired - Lifetime EP1483424B1 (de) 2002-03-09 2003-02-20 Vorrichtung zur schmelztauchbeschichtung von metallsträngen

Country Status (19)

Country Link
US (1) US6929697B2 (ko)
EP (1) EP1483424B1 (ko)
JP (1) JP4382495B2 (ko)
KR (1) KR100941623B1 (ko)
CN (1) CN100436637C (ko)
AT (1) ATE328134T1 (ko)
AU (1) AU2003210320B2 (ko)
BR (1) BR0307201A (ko)
CA (1) CA2474275C (ko)
DE (2) DE10210429A1 (ko)
ES (1) ES2263008T3 (ko)
MX (1) MXPA04008698A (ko)
PL (1) PL205346B1 (ko)
RO (1) RO120776B1 (ko)
RS (1) RS50748B (ko)
RU (1) RU2309193C2 (ko)
UA (1) UA79112C2 (ko)
WO (1) WO2003076681A1 (ko)
ZA (1) ZA200404643B (ko)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10210430A1 (de) * 2002-03-09 2003-09-18 Sms Demag Ag Vorrichtung zur Schmelztauchbeschichtung von Metallsträngen
DE10312939A1 (de) * 2003-02-27 2004-09-09 Sms Demag Ag Verfahren und Einrichtung zum Schmelztauch-Beschichten von Metallbändern, insbesondere von Stahlbändern
WO2004076707A1 (de) * 2003-02-27 2004-09-10 Sms Demag Aktiengesellschaft Verfahren und einrichtung zum schmelztauch-beschichten von metallbändern, insbesondere von stahlbändern
DE102005014878A1 (de) * 2005-03-30 2006-10-05 Sms Demag Ag Verfahren und Vorrichtung zur Schmelztauchbeschichtung eines Metallbandes
CN111926278B (zh) * 2020-09-24 2021-01-08 华中科技大学 一种带状工件的三相电磁抹拭装置及热浸镀系统

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IN191638B (ko) * 1994-07-28 2003-12-06 Bhp Steel Jla Pty Ltd
US6106620A (en) * 1995-07-26 2000-08-22 Bhp Steel (Jla) Pty Ltd. Electro-magnetic plugging means for hot dip coating pot
DE19535854C2 (de) * 1995-09-18 1997-12-11 Mannesmann Ag Verfahren zur Bandstabilisierung in einer Anlage zum Beschichten von bandförmigem Gut
JPH1046310A (ja) * 1996-07-26 1998-02-17 Nisshin Steel Co Ltd シンクロールを使用しない溶融めっき方法及びめっき装置
CA2225537C (en) * 1996-12-27 2001-05-15 Mitsubishi Heavy Industries, Ltd. Hot dip coating apparatus and method
US6037011A (en) * 1997-11-04 2000-03-14 Inland Steel Company Hot dip coating employing a plug of chilled coating metal
DE10014867A1 (de) * 2000-03-24 2001-09-27 Sms Demag Ag Verfahren und Einrichtung zum Schmelztauchbeschichten von Metallsträngen, insbesondere von Stahlband

Also Published As

Publication number Publication date
WO2003076681A1 (de) 2003-09-18
ATE328134T1 (de) 2006-06-15
CN1639379A (zh) 2005-07-13
KR20040090993A (ko) 2004-10-27
AU2003210320A1 (en) 2003-09-22
RU2309193C2 (ru) 2007-10-27
AU2003210320B2 (en) 2008-07-31
EP1483424A1 (de) 2004-12-08
KR100941623B1 (ko) 2010-02-11
RS50748B (sr) 2010-08-31
BR0307201A (pt) 2004-11-03
CA2474275A1 (en) 2003-09-18
US20050076835A1 (en) 2005-04-14
RU2004129776A (ru) 2005-06-10
DE10210429A1 (de) 2003-09-18
CN100436637C (zh) 2008-11-26
ES2263008T3 (es) 2006-12-01
US6929697B2 (en) 2005-08-16
DE50303578D1 (de) 2006-07-06
CA2474275C (en) 2010-08-17
PL205346B1 (pl) 2010-04-30
RO120776B1 (ro) 2006-07-28
YU79704A (sh) 2006-03-03
MXPA04008698A (es) 2005-07-13
JP2005525466A (ja) 2005-08-25
ZA200404643B (en) 2005-02-10
UA79112C2 (en) 2007-05-25
JP4382495B2 (ja) 2009-12-16
PL370504A1 (en) 2005-05-30

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