EP0959995B1 - Verfahren zum vertikalstranggiessen von metallen - Google Patents
Verfahren zum vertikalstranggiessen von metallen Download PDFInfo
- Publication number
- EP0959995B1 EP0959995B1 EP98900062A EP98900062A EP0959995B1 EP 0959995 B1 EP0959995 B1 EP 0959995B1 EP 98900062 A EP98900062 A EP 98900062A EP 98900062 A EP98900062 A EP 98900062A EP 0959995 B1 EP0959995 B1 EP 0959995B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- level
- metal
- moulds
- initial
- starting
- 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
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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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/161—Controlling or regulating processes or operations for automatic starting the casting process
-
- 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
- B22D11/14—Plants for continuous casting
- B22D11/147—Multi-strand plants
-
- 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
- B22D11/16—Controlling or regulating processes or operations
Definitions
- the invention relates to a method for automatic vertical continuous casting metals, especially aluminum alloys, in a multi-mold Casting plant, in which process the liquid metal from in an oven through a trough to the molds and via nozzles with adjustable flow into the from on one lowerable casting table arranged approach floors first closed molds is passed, the metal flow rate each nozzle, starting from an initial time and an initial level of the metal at which the metal level control begins individually regulated in each mold is that the metal in all molds to a predetermined Starting time is essentially the same starting level has, in which the lowering of the casting table for generation the metal strands begins.
- Crucial for the trouble-free operation of a multi-strand Casting system is mastery of the start-up process, i.e. the optimal control of the metal feed to the individual casting units until the actual casting start, which is initiated by lowering the casting table.
- the metal flow rate by means of a motor-driven Plug rod can be set changeable can At the same time in a known manner about level measuring devices the metal level in each mold is measured continuously, compared with the setpoint and the difference between actual and setpoint by appropriate control of the plug rod drive in the associated Inject the speed of the metal feed into the mold customized.
- From GB-A-2 099 189 is a metal level control for a multi-strand casting system known, with the reaching of a first metal level in a mold linearly increasing setpoint to a common for all molds second level is specified.
- the regulation of Metal level in the individual molds is due to the increasing target value as soon as this in the individual molds is reached.
- EP-B-O 517 629 discloses a method of the aforementioned Type in which the individual metal level control in every mold as soon as the incoming metal a predetermined minimum height above the respective approach floor has reached. Starting from this minimum height above the Approach floor, the level control takes place in each mold individual, linearly increasing setpoint curves, so that a predetermined, common level in all molds are reached at the same time.
- a major disadvantage of the state of the art Technology with different filling curves for each mold is in danger of the system getting out of control, if one of the ingot molds becomes frozen due to premature solidification Metal melt not to be filled or with a great delay begins.
- there can be big differences in the filling kinetics occur when lowering the casting table, if individual Fill molds too late and therefore towards the end of the filling process have a steep filling curve.
- the algorithm also makes filling curves much more complicated.
- the invention is therefore based on the object of a method to create the type mentioned, in which the metal stand in the individual molds during the approach and mold filling phase in a simple manner and in as much as possible a short time to start lowering the casting table predetermined level can be regulated without there is a risk of metal freezing.
- the part of the setpoint curve preferably extends with the major slope, starting from the initial level, in one Range from about 10 to 70%, preferably 30 to 60%, of the total Level increase.
- the part of the setpoint curve with the a smaller slope against the starting level preferably extends over a range of 10 to 40%, preferably 15 up to 25% of the total level increase.
- the method according to the invention starts the metal level control in all molds at the same time, as soon as in one mold the initial level has been reached. Conveniently also starts lowering the casting table with the approach floors, as soon as the start level is reached in a mold.
- the metal level in the launder is also preferred Start of the filling phase of the start-up floors and the molds up to and with the stationary casting phase at a constant level held.
- the metal feed into the molds based on the setpoint curve is preferably PID-controlled.
- the setpoint curve shown in FIG. 2 can be divided into an area A starting from the initial value N O and into an adjoining area B running against the starting level N S. It is readily apparent that the area A of the setpoint curve has a larger slope than the average slope Ns-No / ts-to. Accordingly, there is a smaller slope for area B.
- the setpoint curve is formed by 6 pairs of measured values N x , t x .
- the embodiment shown in the drawing relates to the continuous casting of an aluminum alloy in a conventional mold.
- the inventive the process is also the same for other casting processes for example when casting in an electromagnetic Alternating field (EMC) applicable.
- EMC electromagnetic Alternating field
- the process is also not based on the casting of aluminum alloys limited.
- Other materials with the inventive Processes can be cast into strands are e.g. Magnesium or copper alloys.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
- Fig. 1 einen vereinfachten Querschnitt durch einen Teil einer Kokille mit eingefahrenem Anfahrboden;
- Fig. 2 eine Sollwertkurve des zeitlichen Verlaufs des Metallstandes in den einzelnen Kokillen.
Claims (7)
- Verfahren zum automatischen Vertikalstranggiessen von Metallen, insbesondere von Aluminiumlegierungen, in einer mehrere Kokillen umfassenden Giessanlage, bei welchem Verfahren das flüssige Metall von einem Ofen über eine Giessrinne an die Kokillen herangeführt und über Düsen mit regelbarem Durchfluss in die von auf einem absenkbaren Giesstisch angeordneten Anfahrböden zunächst geschlossenen Kokillen geleitet wird, wobei die Metalldurchflussmenge jeder Düse, ausgehend von einer Anfangszeit (tO) und einem Anfangsniveau (NO) des Metalls, bei der die Metallstandsregelung beginnt, in jeder Kokille individuell so geregelt wird, dass das Metall in allen Kokillen zu einer vorbestimmten Startzeit (tS) ein im wesentlichen gleiches Startniveau (NS) aufweist, bei dem das Absenken des Giesstisches zur Erzeugung der Metallstränge beginnt,
dadurch gekennzeichnet, dass
das Metallniveau (N) während des Füllvorganges zwischen dem Anfangsniveau (NO) bei der Anfangszeit (tO) und dem Startniveau (NS), bei der Startzeit (tS) in allen Kokillen gleichzeitig und als Funktion der Zeit (t) nach einer für alle Kokillen identischen Sollwertkurve N=f(t) geregelt wird, wobei die Steigung dN / dt der Sollwertkurve in einem Bereich (A) ausgehend vom Anfangsniveau (NO) grösser und in einem Bereich (B) gegen das Startniveau (NS) kleiner ist als die mittlere Steigung ( Ns-No / ts-to) zwischen Anfangs- und Startniveau. - Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Steigung dN / dt der Sollwertkurve N=f(t), ausgehend vom Anfangsniveau (NO), in einem Bereich von 10 bis 70%, vorzugsweise 30 bis 60%, des gesamten Niveauanstiegs (NS-NO) grösser und gegen das Startniveau (NS) in einem Bereich von 10 bis 40%, vorzugsweise 15 bis 25%, des gesamten Niveauanstiegs kleiner ist als die mittlere Steigung ( Ns-No / ts-to) zwischen Anfangs- und Startniveau.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Sollwertkurve aus 4 bis 8, vorzugsweise 5 bis 6, Wertepaaren (Nx,tx) zusammengesetzt ist.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Metallstandsregelung in allen Kokillen gleichzeitig beginnt, sobald in einer Kokille das Anfangsniveau (NO) erreicht ist.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Absenken des Giesstisches mit den Anfahrböden beginnt, sobald in einer Kokille das Startniveau (NS) erreicht ist.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Metallstand in der Giessrinne vom Beginn der Füllphase der Anfahrböden und der Kokillen bis und mit der stationären Giessphase auf einem konstanten Niveau gehalten wird.
- Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Metallzufuhr in die Kokillen aufgrund der Sollwertkurve PID-geregelt erfolgt.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98900062A EP0959995B1 (de) | 1997-01-24 | 1998-01-07 | Verfahren zum vertikalstranggiessen von metallen |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97810035A EP0855238A1 (de) | 1997-01-24 | 1997-01-24 | Verfahren zum Vertikalstranggiessen von Metallen |
EP97810035 | 1997-01-24 | ||
PCT/CH1998/000004 WO1998032559A1 (de) | 1997-01-24 | 1998-01-07 | Verfahren zum vertikalstranggiessen von metallen |
EP98900062A EP0959995B1 (de) | 1997-01-24 | 1998-01-07 | Verfahren zum vertikalstranggiessen von metallen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0959995A1 EP0959995A1 (de) | 1999-12-01 |
EP0959995B1 true EP0959995B1 (de) | 2001-12-19 |
Family
ID=8230140
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97810035A Withdrawn EP0855238A1 (de) | 1997-01-24 | 1997-01-24 | Verfahren zum Vertikalstranggiessen von Metallen |
EP98900062A Expired - Lifetime EP0959995B1 (de) | 1997-01-24 | 1998-01-07 | Verfahren zum vertikalstranggiessen von metallen |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97810035A Withdrawn EP0855238A1 (de) | 1997-01-24 | 1997-01-24 | Verfahren zum Vertikalstranggiessen von Metallen |
Country Status (9)
Country | Link |
---|---|
US (1) | US6260603B1 (de) |
EP (2) | EP0855238A1 (de) |
AT (1) | ATE211039T1 (de) |
AU (1) | AU716841B2 (de) |
CA (1) | CA2277959C (de) |
DE (1) | DE59802528D1 (de) |
IS (1) | IS2026B (de) |
NO (1) | NO993589L (de) |
WO (1) | WO1998032559A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0995523A1 (de) * | 1998-10-23 | 2000-04-26 | Alusuisse Technology & Management AG | Vertikalstranggiessanlage mit optimierter Metallniveaumessung |
EP1486347A1 (de) * | 2003-06-12 | 2004-12-15 | Fuji Photo Film B.V. | Substrat aus Aluminium-Legierung für lithographische Druckplatten und Verfahren zu seiner Herstellung |
WO2018060246A1 (de) * | 2016-09-27 | 2018-04-05 | Hydro Aluminium Rolled Products Gmbh | VERFAHREN ZUM MEHRFACHGIEßEN VON METALLSTRÄNGEN |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4498521A (en) * | 1981-05-26 | 1985-02-12 | Kaiser Aluminum & Chemical Corporation | Molten metal level control in continuous casting |
US4567935A (en) | 1981-05-26 | 1986-02-04 | Kaiser Aluminum & Chemical Corporation | Molten metal level control in continuous casting |
US4730660A (en) | 1984-09-05 | 1988-03-15 | Metacon Aktiengesellschaft | Process for casting molten metal into several strands |
DE3538222A1 (de) * | 1985-10-26 | 1987-05-27 | Metacon Ag | Verfahren zum anfahren einer stranggiessanlage mit mehreren straengen |
CH682376A5 (de) * | 1990-02-28 | 1993-09-15 | Stopinc Ag | Verfahren zum automatischen Angiessen von einer Stranggiessanlage. |
FR2677284B1 (fr) * | 1991-06-07 | 1993-08-27 | Pechiney Aluminium | Procede et appareillage pour la coulee automatique de demi-produits. |
-
1997
- 1997-01-24 EP EP97810035A patent/EP0855238A1/de not_active Withdrawn
-
1998
- 1998-01-07 AT AT98900062T patent/ATE211039T1/de not_active IP Right Cessation
- 1998-01-07 EP EP98900062A patent/EP0959995B1/de not_active Expired - Lifetime
- 1998-01-07 WO PCT/CH1998/000004 patent/WO1998032559A1/de active IP Right Grant
- 1998-01-07 AU AU53053/98A patent/AU716841B2/en not_active Ceased
- 1998-01-07 CA CA002277959A patent/CA2277959C/en not_active Expired - Fee Related
- 1998-01-07 DE DE59802528T patent/DE59802528D1/de not_active Expired - Fee Related
- 1998-01-07 US US09/355,241 patent/US6260603B1/en not_active Expired - Fee Related
-
1999
- 1999-07-06 IS IS5111A patent/IS2026B/is unknown
- 1999-07-22 NO NO993589A patent/NO993589L/no not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
ATE211039T1 (de) | 2002-01-15 |
DE59802528D1 (de) | 2002-01-31 |
EP0855238A1 (de) | 1998-07-29 |
EP0959995A1 (de) | 1999-12-01 |
IS2026B (is) | 2005-08-15 |
CA2277959C (en) | 2004-03-16 |
WO1998032559A1 (de) | 1998-07-30 |
CA2277959A1 (en) | 1998-07-30 |
NO993589L (no) | 1999-09-24 |
US6260603B1 (en) | 2001-07-17 |
NO993589D0 (no) | 1999-07-22 |
AU716841B2 (en) | 2000-03-09 |
IS5111A (is) | 1999-07-06 |
AU5305398A (en) | 1998-08-18 |
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