EP1427553A2 - Verfahren sowie eine vorrichtung zur herstellung eines metallbandes an einer rollen-bandgiessmaschine - Google Patents
Verfahren sowie eine vorrichtung zur herstellung eines metallbandes an einer rollen-bandgiessmaschineInfo
- Publication number
- EP1427553A2 EP1427553A2 EP02779345A EP02779345A EP1427553A2 EP 1427553 A2 EP1427553 A2 EP 1427553A2 EP 02779345 A EP02779345 A EP 02779345A EP 02779345 A EP02779345 A EP 02779345A EP 1427553 A2 EP1427553 A2 EP 1427553A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- melt
- casting
- carrier
- conductors
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
Definitions
- the invention relates to a method for producing a metal strip by continuously pouring molten metal between two casting rolls of a roller band casting machine and a device for performing the method.
- the present invention is based on the object of proposing a method of the type mentioned at the outset and an apparatus for carrying out the method, by means of which the risk of the impurities and oxides being washed onto the casting roller surfaces and of premature solidification of parts of the metal melt being largely eliminated becomes. According to the invention, this object is achieved by a method having the features of claim 1 and by a device having the features of claim 11 or 20.
- FIG. 1 shows two casting rolls of a roll band casting machine with a metal melt bath in between and each with a device arranged above the melt bath surface and extending along the respective casting roll for generating a surface flow in the melt;
- the melt pool is denoted by 4 in FIG. 1 and its surface by 5.
- the metal strip 8 that is produced is led away in the direction of arrow B through a passage gap 7 between the two cooled casting rolls 1, 2.
- the exit plane of the metal strip 8 corresponds to the middle plane E of the melting bath 4, in which the pouring device 6 also lies.
- devices 10, 10 'for generating magnetic rotating fields which extend along the casting rolls 1, 2, are arranged above the molten bath surface 5 near the casting roll surfaces.
- Various exemplary embodiments of these devices are described in more detail below with reference to FIGS. 2 to 9.
- the directions of rotation of the magnetic rotating fields are designated in Fig. 1 with Fi, F 2 , whose axes of rotation with A 1; A 2 .
- Due to the magnetic rotating fields local electrical eddy currents are generated in the electrically conductive metal melt, which exert forces on the conductive melt in such a way that surface flows occur in the melt, which flow away from the casting rolls 1, 2 to the central plane E of the melting bath 4 are (see arrows Si, S 2 ).
- the surface currents prevent premature, unwanted solidification of parts of the melt at the transition between the casting roll surface and the molten bath surface, and on the other hand prevent the build-up of contaminants and oxides on the casting roll surfaces and their entrainment by the casting rolls 1, 2.
- the contaminants and oxides are transported away from the casting rolls and can be removed along the pouring device 6 located in the middle plane E.
- the casting rolls 1, 2 are generally provided with a nickel layer on their surface.
- a nickel layer on their surface.
- eddy currents are generated by the magnetic rotating fields, which locally lead to a slight increase in temperature, which further reduces the risk of premature solidification of the melt on the cooled roll surface.
- FIGS. 2 to 9 Various exemplary embodiments of the devices 10, 10 ′ for generating magnetic rotating fields will now be described in more detail with reference to FIGS. 2 to 9.
- FIG. 2 shows a coil system 10'a which is arranged near the transition from the melting bath surface 5 / casting roll 2 above the melting bath 4 and extends along the casting roll 2 and which comprises a stationary coil support 15 of circular cross-section, on the circumference of which a number of conductors 16 or coils is arranged. These are switched in such a way that a multi-phase excitation by phase-shifted alternating current produces a magnetic field rotating in the direction of rotation F 2 , the course of which is indicated in FIG. 2 by line FV.
- the axis of rotation A 2 of this rotating field coincides with the axis of the coil carrier 15.
- the molten metal on the molten bath surface 5 is pushed away from the casting roller 2 in the direction of the arrow S 2 by the rotating field in interaction with the fields of the electrical eddy currents generated in the melt and is flattened.
- the surface of the melt is thereby calmed and the "splashing up" of the liquid metal and the impurities on the surface of the casting rolls is prevented.
- the impurities and oxides are forced to the middle level E of the melt pool 4.
- the excitation of the coils with respect to the frequency and intensity can be regulated as a function of the casting parameters, preferably the supply of the coil system 10'a and the supply of the opposite coil system associated with the other casting roll 1 take place separately, for which purpose known multiphase, adjustable electronic
- the field strength and the frequency can be optimally adapted to the requirements of the casting process, and the position of the respective coil system above the melt pool surface 5 can be detected by suitable sensors and can be controlled in an optimized manner for the process.
- the coils can be excited with a multiphase alternating current from a sinusoidal, rectangular or other suitable pulse shape.
- FIG. 3 shows a coil system 10'b with coils electrically offset by 120 ° (cf. conductors 16x, 16y, 16z; 16u, 16v, 16w on the circumference of the coil carrier 15), which are excited by a three-phase alternating current.
- a again fixed coil carrier 15c of a coil system 10'c is provided with a lower surface 18c facing and parallel to the molten bath surface 5, to which several, possibly three conductors 16w, 16x, 16v are assigned, which are parallel and at the same distance run to the molten bath surface 5, whereby the flow effect in the melt (cf. arrow direction S 2 ) is additionally increased.
- FIG. 5 The same effect is also achieved with a coil system 10'd shown in FIG. 5, which has a coil carrier 15d of rectangular cross-section, again with a lower surface 18d facing the molten bath surface 5 with a number of the same spacing above the molten bath surface 5 to this lying conductors 16d is provided.
- the coil carrier 15d has a central channel 20 through which a cooling medium flows.
- the coil system is preferably cooled with the inert cooling gas which is present anyway, so that the cooling effort is low. If higher outputs of the coil system are required, N 2 in liquid form can be used as the cooling medium.
- the coil carrier 15e of the coil system 10'e shown in FIG. 6 also has a central channel 20 through which a cooling medium flows.
- the coil carrier 15e which in turn has a circular cross section and is provided with conductors 16e on the circumference, is accommodated within a ceramic tube 22.
- the coil carrier 15e is also provided with a number, possibly with six recesses 23 distributed over the circumference, which together form with the inner surface 24 of the ceramic tube 22 a number of further cooling channels 25 through which the cooling medium flows.
- the coil system 10f comprises, in addition to the coil carrier 15, which is in turn accommodated in the ceramic tube 22, a field shield 27 which is arranged on the side of the coil carrier 15 facing away from the molten bath surface 5.
- the field shield 27 to prevent unwanted stray fields and to increase the effect to be achieved is preferably made of sheet steel or ferrite.
- the conductors are preferably insulated with a temperature-resistant oxide (e.g. pyrothenaxone insulation).
- a cooling medium can also flow directly through the conductors. The excitation of the coils is feasible with a small cross section of cable feeds.
- the conductors or coils run in a spiral on the circumference of the respective coil support. Then the melt receives an additional force component directed against the side seal (or side seals) 3, which is used to transport contaminants and oxides away.
- FIGS. 8 and 9 Another type of devices 10'h, 10i for generating rotary magnetic fields is shown in FIGS. 8 and 9.
- 5 rotating magnet carriers 30h and 30i are arranged above the molten bath surface along the respective casting roll 1, 2, to each of which a number of cooled permanent magnets 31h and 31i are attached.
- the rotation of the permanent magnet arrangement in turn creates magnetic rotating fields, which cause local eddy currents and thereby also the desired flow in the melt.
- Local eddy currents can also be generated in the surface nickel layer of the casting rolls 1, 2, which slightly loosen cause a temperature rise on the surface of the casting rolls and counteract the premature solidification of the melt at these points.
- the magnetic carriers 30h, 30i also each have a central channel 33 through which a cooling medium flows or cooling openings arranged in another way and are surrounded by a ceramic tube 32.
- the permanent magnets 31 h are arranged in the circumferential direction of the magnet carrier 30 h.
- the permanent magnets 31 i are arranged radially to the axis of rotation Ai of the magnet carrier 30i.
- the axis of rotation A 2 or A 1 of the magnetic carrier 30h or 30i is the axis of rotation of the magnetic rotating field at the same time in both variants.
- the method according to the invention and the devices according to the invention for carrying out the method enable a substantial increase in the quality of the metal strip to be produced and are nevertheless simple and inexpensive from an operational point of view.
- This method can also be used to dampen and flatten the waves in the liquid area in order to obtain straight solidification lines.
- the two devices 10 and 10 ' are preferably controlled in such a way that the solidification lines form at the same height.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Rolls And Other Rotary Bodies (AREA)
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH17162001 | 2001-09-18 | ||
| CH01716/01A CH695090A5 (de) | 2001-09-18 | 2001-09-18 | Verfahren sowie eine Vorrichtung zur Herstellung eines Metallbandes an einer Rollen-Bandgiessmaschine. |
| PCT/EP2002/010276 WO2003024643A2 (de) | 2001-09-18 | 2002-09-13 | Verfahren sowie eine vorrichtung zur herstellung eines metallbandes an einer rollen-bandgiessmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1427553A2 true EP1427553A2 (de) | 2004-06-16 |
| EP1427553B1 EP1427553B1 (de) | 2006-06-21 |
Family
ID=4566014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02779345A Expired - Lifetime EP1427553B1 (de) | 2001-09-18 | 2002-09-13 | Verfahren sowie eine vorrichtung zur herstellung eines metallbandes an einer rollen-bandgiessmaschine |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US6923245B2 (de) |
| EP (1) | EP1427553B1 (de) |
| CN (1) | CN1250362C (de) |
| AT (1) | ATE330734T1 (de) |
| AU (1) | AU2002342685A1 (de) |
| CH (1) | CH695090A5 (de) |
| DE (1) | DE50207323D1 (de) |
| WO (1) | WO2003024643A2 (de) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT414103B (de) * | 2003-05-19 | 2006-09-15 | Voest Alpine Ind Anlagen | Verfahren zur herstellung eines gegossenen metallbandes und zweiwalzengiesseinrichtung hierzu |
| DE102004017443B3 (de) * | 2004-04-02 | 2005-04-21 | Technische Universität Dresden | Verfahren und Vorrichtung zum Rühren von elektrisch leitenden Flüssigkeiten in Behältern |
| DE102007014806A1 (de) * | 2007-03-28 | 2008-10-02 | Schott Ag | Verfahren und Vorrichtung zur Bewegung einer freien Metalloberfläche geschmolzenen Metalls |
| CN102310174B (zh) * | 2011-09-07 | 2013-06-05 | 中国科学院金属研究所 | 一种改善金属凝固缺陷、细化凝固组织的方法和装置 |
| CN104057046A (zh) * | 2013-03-21 | 2014-09-24 | 宝山钢铁股份有限公司 | 低频脉冲电磁铸造方法 |
| WO2015179680A2 (en) * | 2014-05-21 | 2015-11-26 | Novelis Inc. | Mixing eductor nozzle and flow control device |
| DE102019104145A1 (de) | 2019-02-19 | 2020-08-20 | Sma Solar Technology Ag | Verfahren zum Ausschalten von Leistungshalbleiterschaltern einer Brückenschaltung, Brückenschaltung und Wechselrichter umfassend eine Brückenschaltung |
| CN110270669B (zh) * | 2019-07-31 | 2021-10-26 | 东北大学 | 磁压约束控制大拉速条件下板坯结晶器弯月面变形的方法 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6221443A (ja) * | 1985-07-22 | 1987-01-29 | Mitsubishi Heavy Ind Ltd | 薄板連続鋳造装置 |
| JPS6277158A (ja) * | 1985-09-30 | 1987-04-09 | Nippon Steel Corp | 双ロ−ル型連続鋳造設備における溶融金属の流動制御装置 |
| FR2664513A1 (fr) * | 1990-07-16 | 1992-01-17 | Siderurgie Fse Inst Rech | Procede et dispositif de controle de l'epaisseur en coulee continue de bande mince de materiau electroconducteur. |
| AUPN426095A0 (en) | 1995-07-19 | 1995-08-10 | Bhp Steel (Jla) Pty Limited | Method and apparatus for giving vibration to molten metal in twin roll continuous casting machine |
| ZA987528B (en) | 1997-11-18 | 1999-02-23 | Inland Steel Co | Electromagnetic meniscus control in continuous casting |
| JPH11170005A (ja) * | 1997-12-08 | 1999-06-29 | Nippon Steel Corp | エンドレス回転体による連続鋳造装置 |
-
2001
- 2001-09-18 CH CH01716/01A patent/CH695090A5/de not_active IP Right Cessation
-
2002
- 2002-09-13 AU AU2002342685A patent/AU2002342685A1/en not_active Abandoned
- 2002-09-13 US US10/489,228 patent/US6923245B2/en not_active Expired - Fee Related
- 2002-09-13 WO PCT/EP2002/010276 patent/WO2003024643A2/de not_active Ceased
- 2002-09-13 CN CNB028182553A patent/CN1250362C/zh not_active Expired - Fee Related
- 2002-09-13 DE DE50207323T patent/DE50207323D1/de not_active Expired - Lifetime
- 2002-09-13 EP EP02779345A patent/EP1427553B1/de not_active Expired - Lifetime
- 2002-09-13 AT AT02779345T patent/ATE330734T1/de active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO03024643A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20040244939A1 (en) | 2004-12-09 |
| DE50207323D1 (de) | 2006-08-03 |
| AU2002342685A1 (en) | 2003-04-01 |
| WO2003024643A2 (de) | 2003-03-27 |
| CH695090A5 (de) | 2005-12-15 |
| WO2003024643A3 (de) | 2003-10-09 |
| CN1250362C (zh) | 2006-04-12 |
| CN1555299A (zh) | 2004-12-15 |
| US6923245B2 (en) | 2005-08-02 |
| EP1427553B1 (de) | 2006-06-21 |
| ATE330734T1 (de) | 2006-07-15 |
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