EP1483423A1 - Vorrichtung zur schmelztauchbeschichtung von metallsträngen - Google Patents
Vorrichtung zur schmelztauchbeschichtung von metallsträngenInfo
- Publication number
- EP1483423A1 EP1483423A1 EP03743810A EP03743810A EP1483423A1 EP 1483423 A1 EP1483423 A1 EP 1483423A1 EP 03743810 A EP03743810 A EP 03743810A EP 03743810 A EP03743810 A EP 03743810A EP 1483423 A1 EP1483423 A1 EP 1483423A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal
- inductor
- guide channel
- electromagnetic
- metal strand
- 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.)
- Granted
Links
- 239000002184 metal Substances 0.000 title claims abstract description 78
- 238000003618 dip coating Methods 0.000 title claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 43
- 239000011248 coating agent Substances 0.000 claims abstract description 40
- 230000006698 induction Effects 0.000 claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 230000000903 blocking effect Effects 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 3
- 230000003993 interaction Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 8
- 230000005294 ferromagnetic effect Effects 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 230000005291 magnetic effect Effects 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005307 ferromagnetism Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
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 device for hot-dip coating of metal strands, in particular steel strip, in which the metal strand can be passed vertically through a container holding the molten coating metal and through an upstream guide channel, an electromagnetic inductor being arranged in the area of the guide channel, which is used for holding back of the coating metal in the container by means of an electromagnetic blocking field in the coating metal can induce induction currents which, in interaction with the electromagnetic blocking field, exert an electromagnetic force.
- the strips are introduced into the dip coating bath from above in an immersion nozzle. Because the coating metal in liquid Form and you want to use gravitation together with blow-off devices to adjust the coating thickness, but the subsequent processes prohibit contact with the strip until the coating metal has completely solidified, the strip must be redirected in the vertical direction in the coating vessel. This happens with a roller that runs in the liquid metal. Due to the liquid coating metal, this role 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 scraping nozzle, the cooling processes of the metal strip passing through and the heating process for setting alloy layers in the coating metal. As a result, the top speed is generally limited and, on the other hand, certain metal strips cannot be run at the maximum speed possible for the system.
- non-ferromagnetic metal strips are thus possible, but problems arise with essentially ferromagnetic steel strips in that they are drawn in the electromagnetic seals by the ferromagnetism to the channel walls, thereby damaging the strip surface. It is also problematic that the coating metal is heated inadmissibly by the inductive fields.
- the position of the continuous 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 attraction forces acting on the tape zero. As soon as the steel strip is deflected from its central position, it comes closer to one of the two inductors as it moves away from the other inductor. Such deflection can be caused by simple belt flatness errors. Any type of band waves in the running direction should be mentioned, seen across the width of the band (center buckles, quarter buckles, edge waves, fluttering, twisting, crossbow, S-shape, etc.). According to an exponential function, the magnetic induction, which is responsible for the magnetic attraction, decreases in its field strength with the distance from the inductor.
- the attraction decreases with the square of the induction field strength with increasing distance from the inductor.
- DE 195 35 854 A1 and DE 100 14 867 A1 provide information on solving this problem, that is to say on the exact position control of the metal strand in the guide channel.
- additional correction coils are provided, which are connected to a control system and ensure that the metal strip is brought back into the middle position when it deviates.
- the inductors for generating the moving electromagnetic field must have a relatively large overall height, which is due to the required field strength, electrical currents and the sheet metal cores required for this are explained.
- the height of the inductor is usually around 600 mm. This has negative effects on the height of the submerged metal column in the guide channel.
- the blocking field inductors are operated with alternating current, the frequency of which is higher than 3 kHz. This ensures that the ferromagnetic attraction is only slight; however, it cannot be avoided entirely. Furthermore, it is disadvantageous that when the metal strand passes through the guide channel, the strand heats up considerably.
- the invention is therefore based on the object of further developing a device for hot-dip coating of metal strands of the type mentioned at the outset in such a way that the disadvantages mentioned are overcome.
- an electromagnetic inductor should therefore be designed which has a low overall height and nevertheless does not cause the metal strand to heat up excessively.
- the inductor is connected to electrical supply means which supply it with an alternating current, the frequency of which is less than 500 Hz; it is preferably provided that the frequency is less than 100 Hz, in particular 50 Hz (mains frequency).
- the supply means supply the inductor with single-phase alternating current.
- the inductor advantageously has an induction coil on each side of the guide channel.
- the device is further equipped with guide means for guiding the metal strand in the guide channel.
- guide means for guiding the metal strand in the guide channel.
- the guide means are at least a pair of guide rollers. These are preferably arranged in the lower region of the guide channel or below the guide channel.
- the guide means comprise 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.
- the correction coils can be arranged at the same height as the induction coils.
- the inductor is effective when the electromagnetic inductor for receiving the induction coil and the correction coil has two grooves which run parallel to one another, perpendicular to the direction of movement of the metal strand and perpendicular to the normal direction. The regulation of the metal strand in the guide channel is facilitated if the correction coil arranged in the slots is arranged closer to the metal strand than the induction coil.
- the regulation can take place more precisely if the inductor has at least two correction coils arranged next to one another on both sides of the metal strand. Furthermore, means can be provided for supplying the correction coils with an alternating current which has the same phase as the current with which the induction coils are operated.
- the position of the steel strip passing through can be detected by induction field sensors which are operated with a weak measuring field of high frequency.
- induction field sensors which are operated with a weak measuring field of high frequency.
- a higher-frequency voltage with low power is superimposed on the induction coils.
- the higher frequency voltage has no influence on the seal; in the same way there is no heating of the coating metal or steel strip.
- the higher-frequency induction can be filtered out of the powerful signal of the normal seal and then delivers a signal proportional to the distance from the sensor. This enables the position of the belt in the guide channel to be recorded and regulated.
- Figure 1 schematically shows a hot-dip coating vessel with a metal strand passed through it
- Figure 2 shows schematically the section through the guide channel and the inductors with guide rollers arranged underneath;
- FIG. 3 shows a representation corresponding to FIG. 2 with guide means in the form of correction coils
- FIG. 4 shows the view of an inductor according to FIG. 3, viewed from the side.
- FIG. 1 shows the principle of hot-dip coating a metal strand 1, in particular a steel strip.
- the metal strand to be coated 1 enters the guide channel 4 of the coating system vertically from below.
- 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 upwards in the direction of movement X. So that the liquid coating metal 2 cannot run out of the container 3, an electromagnetic inductor 5 is arranged in the region of the guide channel 4. This consists of two halves 5a and 5b, one of which is arranged to the side of the metal strand 1.
- An electromagnetic blocking field is generated in the electromagnetic inductor 5, which retains the liquid coating metal 2 in the container 3 and thus prevents it from leaking.
- the inductor 5 is supplied with a single-phase alternating current by an electrical supply means 6.
- the frequency f of the alternating current is below 500 Hz.
- Mains frequency, ie 50 or 60 Hz, is preferably used.
- the more detailed structure of the area of the guide channel 4 can be seen in FIG. 2.
- the inductor 5 (or its two halves 5a and 5b) has grooves 9, into which an induction coil 7 is inserted, which is supplied with the alternating current and thus generates the electromagnetic blocking field. Particular care must be taken to ensure that the metal strand 1 is guided in the direction N normally onto the strand 1 as centrally as possible in the guide channel 4.
- guide means 8 are provided, which are formed in FIG. 2 as guide rollers 8a. These are arranged under the guide channel 4 and ensure that the metal strand 1 is inserted centrally into the guide channel 4.
- both the induction coils 7 and the correction coils 8b are positioned in the grooves 9 of the inductor 5a, 5b, namely at the same height - viewed in the direction of movement X.
- the correction coils 8b ', 8b “and 8b”' are driven with the same current phase that is present in the induction coil 7, in front of which the correction coils 8b ', 8b ", 8b”' are arranged.
Landscapes
- 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)
- General Induction Heating (AREA)
- Glass Compositions (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10210430A DE10210430A1 (de) | 2002-03-09 | 2002-03-09 | Vorrichtung zur Schmelztauchbeschichtung von Metallsträngen |
DE10210430 | 2002-03-09 | ||
PCT/EP2003/001701 WO2003076680A1 (de) | 2002-03-09 | 2003-02-20 | Vorrichtung zur schmelztauchbeschichtung von metallsträngen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1483423A1 true EP1483423A1 (de) | 2004-12-08 |
EP1483423B1 EP1483423B1 (de) | 2006-06-14 |
Family
ID=27762824
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03743810A Expired - Lifetime EP1483423B1 (de) | 2002-03-09 | 2003-02-20 | Vorrichtung zur schmelztauchbeschichtung von metallsträngen |
Country Status (15)
Country | Link |
---|---|
US (1) | US7361224B2 (de) |
EP (1) | EP1483423B1 (de) |
JP (1) | JP3973628B2 (de) |
KR (1) | KR100941624B1 (de) |
CN (1) | CN100374611C (de) |
AT (1) | ATE330041T1 (de) |
AU (1) | AU2003210316B2 (de) |
BR (1) | BR0307794A (de) |
CA (1) | CA2478487C (de) |
DE (2) | DE10210430A1 (de) |
ES (1) | ES2266840T3 (de) |
MX (1) | MXPA04008696A (de) |
PL (1) | PL202721B1 (de) |
RU (1) | RU2313617C2 (de) |
WO (1) | WO2003076680A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10255995A1 (de) * | 2002-11-30 | 2004-06-09 | Sms Demag Ag | Vorrichtung und Verfahren zur Schmelztauchbeschichtung eines Metallstranges |
BRPI0407909A (pt) * | 2003-02-27 | 2006-02-14 | Sms Demag Ag | procedimentio e dispositivo para revestir tiras de metal, e, em particular, tiras de aço, por iimersão em banho quente |
DE10312939A1 (de) * | 2003-02-27 | 2004-09-09 | Sms Demag Ag | Verfahren und Einrichtung zum Schmelztauch-Beschichten von Metallbändern, insbesondere von Stahlbändern |
SE527507C2 (sv) * | 2004-07-13 | 2006-03-28 | Abb Ab | En anordning och ett förfarande för stabilisering av ett metalliskt föremål samt en användning av anordningen |
DE102005030766A1 (de) * | 2005-07-01 | 2007-01-04 | Sms Demag Ag | Vorrichtung zur Schmelztauchbeschichtung eines Metallstranges |
WO2015160326A1 (en) | 2014-04-14 | 2015-10-22 | Halliburton Energy Services, Inc. | Wellbore line coating repair |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2316026A1 (fr) * | 1975-07-04 | 1977-01-28 | Anvar | Dispositif electromagnetique de confinement des metaux liquides |
CH648500A5 (de) * | 1980-07-11 | 1985-03-29 | Concast Ag | Verfahren und vorrichtung zum stranggiessen von metall in einem geschlossenen eingiesssystem. |
US4842170A (en) * | 1987-07-06 | 1989-06-27 | Westinghouse Electric Corp. | Liquid metal electromagnetic flow control device incorporating a pumping action |
FR2647814B1 (fr) * | 1989-06-02 | 1994-07-08 | Galva Lorraine | Enceinte utilisable pour recouvrir d'un revetement a base de metal ou d'alliage metallique des objets de forme allongee defilant a travers elle |
FR2700555B1 (fr) * | 1993-01-20 | 1995-03-31 | Delot Process Sa | Procédé de dimensionnement d'une enceinte de galvanisation pourvue d'un dispositif d'essuyage magnétique de produits métallurgiques galvanisés. |
DE4344939C1 (de) * | 1993-12-23 | 1995-02-09 | Mannesmann Ag | Verfahren zum prozeßgerechten Regeln einer Anlage zum Beschichten von bandförmigem Gut |
US5464667A (en) * | 1994-08-16 | 1995-11-07 | Minnesota Mining And Manufacturing Company | Jet plasma process and apparatus |
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 |
US5765730A (en) * | 1996-01-29 | 1998-06-16 | American Iron And Steel Institute | Electromagnetic valve for controlling the flow of molten, magnetic material |
JPH1046311A (ja) * | 1996-07-26 | 1998-02-17 | Nisshin Steel Co Ltd | 電磁シール機構を備えた溶融めっき装置 |
CA2225537C (en) * | 1996-12-27 | 2001-05-15 | Mitsubishi Heavy Industries, Ltd. | Hot dip coating apparatus and method |
FR2797276A1 (fr) * | 1999-08-05 | 2001-02-09 | Lorraine Laminage | Dispositif et procede de controle du revetement en continu par immersion d'une bande metallique en defilement rectiligne vertical |
DE10014867A1 (de) * | 2000-03-24 | 2001-09-27 | Sms Demag Ag | Verfahren und Einrichtung zum Schmelztauchbeschichten von Metallsträngen, insbesondere von Stahlband |
DE10210429A1 (de) * | 2002-03-09 | 2003-09-18 | Sms Demag Ag | Vorrichtung zur Schmelztauchbeschichtung von Metallsträngen |
-
2002
- 2002-03-09 DE DE10210430A patent/DE10210430A1/de not_active Withdrawn
-
2003
- 2003-02-20 JP JP2003574873A patent/JP3973628B2/ja not_active Expired - Fee Related
- 2003-02-20 EP EP03743810A patent/EP1483423B1/de not_active Expired - Lifetime
- 2003-02-20 AT AT03743810T patent/ATE330041T1/de not_active IP Right Cessation
- 2003-02-20 CA CA2478487A patent/CA2478487C/en not_active Expired - Fee Related
- 2003-02-20 PL PL371544A patent/PL202721B1/pl not_active IP Right Cessation
- 2003-02-20 WO PCT/EP2003/001701 patent/WO2003076680A1/de active IP Right Grant
- 2003-02-20 AU AU2003210316A patent/AU2003210316B2/en not_active Ceased
- 2003-02-20 RU RU2004129779/02A patent/RU2313617C2/ru not_active IP Right Cessation
- 2003-02-20 DE DE50303826T patent/DE50303826D1/de not_active Expired - Lifetime
- 2003-02-20 KR KR1020047013929A patent/KR100941624B1/ko not_active IP Right Cessation
- 2003-02-20 MX MXPA04008696A patent/MXPA04008696A/es active IP Right Grant
- 2003-02-20 CN CNB038056186A patent/CN100374611C/zh not_active Expired - Fee Related
- 2003-02-20 ES ES03743810T patent/ES2266840T3/es not_active Expired - Lifetime
- 2003-02-20 US US10/507,269 patent/US7361224B2/en not_active Expired - Fee Related
- 2003-02-20 BR BR0307794-2A patent/BR0307794A/pt not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO03076680A1 * |
Also Published As
Publication number | Publication date |
---|---|
US7361224B2 (en) | 2008-04-22 |
CN100374611C (zh) | 2008-03-12 |
CA2478487C (en) | 2010-11-09 |
KR20040091109A (ko) | 2004-10-27 |
MXPA04008696A (es) | 2005-07-13 |
JP2005526180A (ja) | 2005-09-02 |
WO2003076680A1 (de) | 2003-09-18 |
BR0307794A (pt) | 2004-12-21 |
US20050172893A1 (en) | 2005-08-11 |
AU2003210316A1 (en) | 2003-09-22 |
EP1483423B1 (de) | 2006-06-14 |
PL371544A1 (en) | 2005-06-27 |
RU2313617C2 (ru) | 2007-12-27 |
JP3973628B2 (ja) | 2007-09-12 |
DE10210430A1 (de) | 2003-09-18 |
CN1639378A (zh) | 2005-07-13 |
CA2478487A1 (en) | 2003-09-18 |
RU2004129779A (ru) | 2005-05-10 |
DE50303826D1 (de) | 2006-07-27 |
ATE330041T1 (de) | 2006-07-15 |
PL202721B1 (pl) | 2009-07-31 |
ES2266840T3 (es) | 2007-03-01 |
KR100941624B1 (ko) | 2010-02-11 |
AU2003210316B2 (en) | 2008-06-12 |
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