EP1483424A1 - Device for hot dip coating metal strands - Google Patents
Device for hot dip coating metal strandsInfo
- Publication number
- EP1483424A1 EP1483424A1 EP03743812A EP03743812A EP1483424A1 EP 1483424 A1 EP1483424 A1 EP 1483424A1 EP 03743812 A EP03743812 A EP 03743812A EP 03743812 A EP03743812 A EP 03743812A EP 1483424 A1 EP1483424 A1 EP 1483424A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal
- metal strand
- coils
- correction
- movement
- 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 94
- 238000003618 dip coating Methods 0.000 title claims abstract description 12
- 238000012937 correction Methods 0.000 claims abstract description 51
- 238000000576 coating method Methods 0.000 claims abstract description 43
- 239000011248 coating agent Substances 0.000 claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 230000006698 induction Effects 0.000 claims abstract description 9
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 3
- 239000013307 optical fiber Substances 0.000 claims description 4
- 230000005291 magnetic effect Effects 0.000 description 9
- 239000007788 liquid Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000005294 ferromagnetic effect Effects 0.000 description 3
- 238000000819 phase cycle Methods 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
- 230000005672 electromagnetic field Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000018199 S phase Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 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
- 230000003993 interaction Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 230000001360 synchronised effect Effects 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 is arranged in the area of the guide channel, which induces induction currents to retain the coating metal in the container by means of an electromagnetic traveling field in the coating metal, which currents exert an electromagnetic force in interaction with the traveling electromagnetic field, the inductor having at least two main coils that are arranged in succession in the direction of movement of the metal strand, and has 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 in succession in the direction of movement of the metal strand.
- the coating metal Since the coating metal is 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 in the coating vessel must be deflected in the vertical direction. This happens with a role 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 occur with essentially ferromagnetic steel strips in that they are drawn in the electromagnetic seals by the ferromagnetism to the channel walls, as a result of which the strip surface is damaged. 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 while it moves away from the other inductor. Such deflection can be caused by simple belt flatness errors.
- DE 195 35 854 A1 and DE 100 14 867 A1 provide information on the precise 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 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.
- This object is achieved in that at least some of the correction coils, viewed in the direction of movement of the metal strand, are arranged perpendicular to the direction of movement and perpendicular to the direction normal to the surface of the metal strand.
- the correction coils are preferably arranged in at least two rows, preferably in six rows. Furthermore, each row can have at least two correction coils. It is also advantageously provided that 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 induction fields are superimposed, and the undesired effect of field extinction on the side is compensated for by the correction coil located below it.
- the effect on the underside of the inductors is no longer a problem, since the control range for the liquid column of the metal is in the upper half of the guide channel and therefore no longer interferes here.
- 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. Furthermore, it can be provided that 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 advantageously be provided that at least a part of at least one main coil and at least one correction coil is arranged in each slot. Furthermore, it has proven 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.
- This is preferred 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 main coils arranged in succession in the direction of movement of the metal strand are arranged (that is to say six rows), each of which is supplied with three-phase current that is offset by 60 °.
- a power supply with pulse synchronization via optical fibers can preferably be used.
- Such a configuration of the device enables the correction coils to be operated in synchronism with the traveling field.
- Three phases of a rotating field are usually used for the traveling field inductors; one phase of the main coil, in front of which the correction coil is located, is sufficient for the correction coils.
- 3-phase frequency converters can be used for the traveling field; 1-phase frequency converters are sufficient for the correction coils, one for each correction coil.
- the synchronization of the individual frequency converters is of crucial importance. This is possible in a particularly simple manner with the above-mentioned pulse synchronization via optical fibers, which is recommended because of the strong magnetic fields and their stray fields.
- the position of the steel strip passing through 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 chip has no influence on the sealing; 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 is a front view of an electromagnetic inductor located on the bottom of the hot dip coating container
- FIG. 3 shows the side view of the electromagnetic belonging to FIG.
- Figure 4 shows the phase sequence of the traveling electromagnetic field, which is generated by the electromagnetic inductor.
- FIG. 1 shows the principle of hot-dip coating a metal strand 1, in particular a steel strip.
- the metal strand 1 to be coated 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 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 traveling 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.
- FIGS. 2 and 3 The exact structure of the electromagnetic inductor 5 can be seen in FIGS. 2 and 3. Only one of the two symmetrically designed inductors 5a, 5b is shown, 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 5a.
- the inductor 5a is equipped with a total of six main coils 6 in order to generate the electromagnetic traveling field. These run across 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 FIG. 2, the current directions are entered for a total of five line sections of the main coils 6, as they either exit from the drawing level or enter the drawing level.
- Correction coils 7 are in the inductors 5a, 5b so that the metal strand 1 in the direction N normal to the surface of the strand 1 (see FIGS. 2 and 3) can be held exactly centrally in the guide channel 4 without bumping against the inductors 5a, 5b arranged. As can be seen in particular in FIG. 3, a plurality of correction coils 7 are positioned next to one another in each of the six rows 8 ', 8 ", 8"', 8 "", 8, 8 “” ". In two adjacent ones
- FIG. 4 shows the phase sequence of the three-phase three-phase current as it exists 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 controlled with the same phase that is 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 controlled with three phases of a rotating field, while the correction coils 7 are each supplied with only one phase.
- the implementation of supplying the coils 6 and 7 with phase-precisely directed current is accomplished by means of suitable and well-known frequency converters. These must be synchronized accordingly, for which pulse synchronization via optical fibers is particularly suitable.
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)
- Glass Compositions (AREA)
- General Induction Heating (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10210429 | 2002-03-09 | ||
DE10210429A DE10210429A1 (en) | 2002-03-09 | 2002-03-09 | Device for hot dip coating of metal strands |
PCT/EP2003/001722 WO2003076681A1 (en) | 2002-03-09 | 2003-02-20 | Device for hot dip coating metal strands |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1483424A1 true EP1483424A1 (en) | 2004-12-08 |
EP1483424B1 EP1483424B1 (en) | 2006-05-31 |
Family
ID=27762823
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03743812A Expired - Lifetime EP1483424B1 (en) | 2002-03-09 | 2003-02-20 | Device for hot dip coating metal strands |
Country Status (19)
Country | Link |
---|---|
US (1) | US6929697B2 (en) |
EP (1) | EP1483424B1 (en) |
JP (1) | JP4382495B2 (en) |
KR (1) | KR100941623B1 (en) |
CN (1) | CN100436637C (en) |
AT (1) | ATE328134T1 (en) |
AU (1) | AU2003210320B2 (en) |
BR (1) | BR0307201A (en) |
CA (1) | CA2474275C (en) |
DE (2) | DE10210429A1 (en) |
ES (1) | ES2263008T3 (en) |
MX (1) | MXPA04008698A (en) |
PL (1) | PL205346B1 (en) |
RO (1) | RO120776B1 (en) |
RS (1) | RS50748B (en) |
RU (1) | RU2309193C2 (en) |
UA (1) | UA79112C2 (en) |
WO (1) | WO2003076681A1 (en) |
ZA (1) | ZA200404643B (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10210430A1 (en) * | 2002-03-09 | 2003-09-18 | Sms Demag Ag | Device for hot dip coating of metal strands |
DE10312939A1 (en) * | 2003-02-27 | 2004-09-09 | Sms Demag Ag | Method and device for hot-dip coating of metal strips, in particular steel strips |
US20070036908A1 (en) * | 2003-02-27 | 2007-02-15 | Holger Behrens | Method and device for melt dip coating metal strips, especially steel strips |
DE102005014878A1 (en) * | 2005-03-30 | 2006-10-05 | Sms Demag Ag | Method and apparatus for hot dip coating a metal strip |
CN111926278B (en) * | 2020-09-24 | 2021-01-08 | 华中科技大学 | Three-phase electromagnetic wiping device for strip-shaped workpiece and hot dip coating system |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IN191638B (en) * | 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 (en) * | 1995-09-18 | 1997-12-11 | Mannesmann Ag | Process for strip stabilization in a plant for coating strip-like material |
JPH1046310A (en) * | 1996-07-26 | 1998-02-17 | Nisshin Steel Co Ltd | Hot dip coating method without using sinkroll and coating device |
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 (en) * | 2000-03-24 | 2001-09-27 | Sms Demag Ag | Process for the hot dip galvanizing of steel strips comprises continuously correcting the electrochemical field vertically to the surface of the strip to stabilize a middle |
-
2002
- 2002-03-09 DE DE10210429A patent/DE10210429A1/en not_active Withdrawn
-
2003
- 2003-02-20 KR KR1020047011615A patent/KR100941623B1/en not_active IP Right Cessation
- 2003-02-20 JP JP2003574874A patent/JP4382495B2/en not_active Expired - Lifetime
- 2003-02-20 PL PL370504A patent/PL205346B1/en not_active IP Right Cessation
- 2003-02-20 RU RU2004129776/02A patent/RU2309193C2/en not_active IP Right Cessation
- 2003-02-20 DE DE50303578T patent/DE50303578D1/en not_active Expired - Lifetime
- 2003-02-20 WO PCT/EP2003/001722 patent/WO2003076681A1/en active IP Right Grant
- 2003-02-20 AU AU2003210320A patent/AU2003210320B2/en not_active Ceased
- 2003-02-20 RO ROA200400687A patent/RO120776B1/en unknown
- 2003-02-20 AT AT03743812T patent/ATE328134T1/en not_active IP Right Cessation
- 2003-02-20 BR BR0307201-0A patent/BR0307201A/en active Search and Examination
- 2003-02-20 RS YUP-797/04A patent/RS50748B/en unknown
- 2003-02-20 MX MXPA04008698A patent/MXPA04008698A/en active IP Right Grant
- 2003-02-20 CN CNB038056194A patent/CN100436637C/en not_active Expired - Fee Related
- 2003-02-20 ES ES03743812T patent/ES2263008T3/en not_active Expired - Lifetime
- 2003-02-20 EP EP03743812A patent/EP1483424B1/en not_active Expired - Lifetime
- 2003-02-20 UA UA20041008181A patent/UA79112C2/en unknown
- 2003-02-20 US US10/503,871 patent/US6929697B2/en not_active Expired - Fee Related
- 2003-02-20 CA CA2474275A patent/CA2474275C/en not_active Expired - Fee Related
-
2004
- 2004-06-11 ZA ZA200404643A patent/ZA200404643B/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO03076681A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20050076835A1 (en) | 2005-04-14 |
WO2003076681A1 (en) | 2003-09-18 |
EP1483424B1 (en) | 2006-05-31 |
AU2003210320A1 (en) | 2003-09-22 |
DE50303578D1 (en) | 2006-07-06 |
ES2263008T3 (en) | 2006-12-01 |
CN1639379A (en) | 2005-07-13 |
ATE328134T1 (en) | 2006-06-15 |
CA2474275A1 (en) | 2003-09-18 |
BR0307201A (en) | 2004-11-03 |
KR20040090993A (en) | 2004-10-27 |
KR100941623B1 (en) | 2010-02-11 |
JP2005525466A (en) | 2005-08-25 |
PL205346B1 (en) | 2010-04-30 |
CN100436637C (en) | 2008-11-26 |
AU2003210320B2 (en) | 2008-07-31 |
RU2004129776A (en) | 2005-06-10 |
RS50748B (en) | 2010-08-31 |
UA79112C2 (en) | 2007-05-25 |
YU79704A (en) | 2006-03-03 |
RO120776B1 (en) | 2006-07-28 |
CA2474275C (en) | 2010-08-17 |
DE10210429A1 (en) | 2003-09-18 |
JP4382495B2 (en) | 2009-12-16 |
PL370504A1 (en) | 2005-05-30 |
ZA200404643B (en) | 2005-02-10 |
RU2309193C2 (en) | 2007-10-27 |
US6929697B2 (en) | 2005-08-16 |
MXPA04008698A (en) | 2005-07-13 |
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