EP1133370B1 - Verfahren zum oszillieren einer stranggiesskokille mittels variabler oszillationsparameter - Google Patents
Verfahren zum oszillieren einer stranggiesskokille mittels variabler oszillationsparameter Download PDFInfo
- Publication number
- EP1133370B1 EP1133370B1 EP99958061A EP99958061A EP1133370B1 EP 1133370 B1 EP1133370 B1 EP 1133370B1 EP 99958061 A EP99958061 A EP 99958061A EP 99958061 A EP99958061 A EP 99958061A EP 1133370 B1 EP1133370 B1 EP 1133370B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oscillation
- frequency
- casting
- strip
- speed
- 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
Links
- 230000010355 oscillation Effects 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000009749 continuous casting Methods 0.000 title claims abstract description 14
- 238000005266 casting Methods 0.000 claims abstract description 40
- 230000001133 acceleration Effects 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 239000007787 solid Substances 0.000 claims abstract description 4
- 238000010586 diagram Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 claims 1
- 230000000630 rising effect Effects 0.000 claims 1
- 230000007423 decrease Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract 1
- 239000002893 slag Substances 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
Images
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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/053—Means for oscillating the moulds
-
- 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
- B22D11/166—Controlling or regulating processes or operations for mould oscillation
Definitions
- the invention relates to a method for oscillating a steel continuous casting mold by means of an oscillation device, the lifting height depending on the Strand withdrawal speed is set and at a leading speed the mold relative to the strand, the so-called negative strip, liquid or solid Pouring medium is drawn into the gap between the mold and the strand.
- the mold used for this is made in a periodic movement offset, thereby causing a relative movement between the strand and the mold produce.
- a grainy on the bath surface in the mold to powdery casting powder after melting as a lubricant in the gap between The mold and strand are drawn in and thus the friction between the mold and Strand decreased.
- This effect makes the mold wear considerably reduced and prevents the strand from sticking to the mold wall.
- the periodic mold movement usually forms in the position and speed curve a sine wave that has a constant stroke, e.g. with eccentric oscillators, and a period adapted to the casting speed having.
- This alternating upsetting or stretching process of the strand shell causes one oscillating excitation of the entire strand. If these are in an unfavorable, For example, there is a harmonic frequency range, this can cause an oscillation of the entire casting plant. This adverse effect is all the more stronger, the greater the coefficient of friction between the mold and the strand shell, d. H. the lower the lubrication and therefore the slag supply.
- document DE 37 04 793 C2 describes a mold lifting device with two on a lifting table for the continuous casting mold or directly on this articulated, rotatably drivable eccentric shaft.
- a non-sinusoidal movement of the mold is caused by the conscious Generated use of the cardan error, which occurs when a propeller shaft not in alignment between the shafts.
- cardan error which occurs when a propeller shaft not in alignment between the shafts.
- Document EP 0 121 622 B1 describes a process for continuous casting using a mold stored in a frame, which by a electro-hydraulic servo is vibrated.
- Document EP 0 618 023 A1 discloses a process for continuous casting, in which a mold with a comparatively long side wall and a comparatively narrow transverse wall is used. At the same time as the oscillation of the With every vibration, molds are in a time phase in which the difference of the Mold speed and the strand withdrawal speed a predetermined Value exceeds the side walls of the mold by a small transverse amount moved away from the cast strand, while in the remaining time with approximately same speed of strand and mold the side walls closer again the cast strand are created.
- the mold should be the tensile and Upsetting forces are reduced so that the depth of the oscillation marks is reduced and the middle of the strand shows less segregation. In this case the penetration of the slag into the gap between the strand and the mold through the alternating enlargement and narrowing of the mold easier.
- EP 0 325 931 B1 describes a method for oscillating a steel continuous casting mold by means of an oscillation device, the lifting height depending is set by the strand withdrawal speed. With a sawtooth-like Oscillation movement overtakes the mold throughout Downward movement of the strand. In a first area with low strand withdrawal speeds becomes the oscillation frequency while maintaining a negative strip time booted. When the strand withdrawal speed is increased further the oscillation frequency is kept constant in a second area and the lifting height is reduced depending on the strand withdrawal speed Retention of negative strip time increased.
- the object of the invention to provide a method of the type mentioned in the preamble of claim 1, which overcoming the disadvantages, difficulties and technical limits especially at higher casting or strand withdrawal speeds the production of continuous casting products with optimal quality enables the acceleration of the masses of a continuous caster to be reduced Extraction forces on the oscillators are reduced, as is the negative strip time with increasing Keeps the casting speed at least constant and draws in evenly of slag by setting a constant relative speed between the mold and the strand.
- both the frequency and the stroke are independent of each other the casting speed can be varied, as long and / or constant as possible negative / positive strip time can be achieved.
- Non-sinudial trapezoidal forms of speed are marked due to an asymmetrical course, especially for fast pouring Casting machines is suitable and seen in the downward movement in the casting direction is slower than the upward movement.
- Fig. 1 shows the diagram plotted against the casting speed with increasing Line withdrawal speed decreasing time values [ms] for the course of the absolute Negative strip time according to the solid line according to the state of the Technique and according to the dotted line according to the invention. It shows, that on average the negative strip time in the method according to the invention is average is 25% larger than in the prior art.
- FIG. 3 shows vibration curves with symmetrical or asymmetrical mold oscillation according to the invention.
- the stroke of 3.9 mm is approximately 25% greater than that of the corresponding curve in FIG. 3 (3.1 mm), and the acceleration is 4.0 m / s 2 , ie it is approximately 30 % less than in the corresponding vibration example of FIG. 3 (5.3 m / sec 2 ).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Confectionery (AREA)
Description
- Die Beschleunigungen der Massen werden um bis zu 25 % reduziert, womit auch die Ausziehkräfte an den Oszillatoren bedeutend verringert werden.
- Eine resultierende Schwingung des Systems der Gießmaschine wird unterbunden;
- die Fundamente und die mechanischen Einrichtungen werden weniger belastet;
- der Gießspiegel in der Kokille wird nicht durch Schwingungen angeregt;
- die Negativ-Strip-Zeit ist prozentual gleich, jedoch absolut bis um 30 % länger. Dem Gießmedium wird eine längere Zeit zu Einziehen und Ausbreiten im Kaliber zwischen Strangschale und Kupferplatte zur Verfügung gestellt.
- Eine gezielte Variation der absoluten Negativ-Strip-Zeit wird ermöglicht;
- die Negativ-Strip-Zeit kann bei steigender Gießgeschwindigkeit konstant gehalten werden;
- ein konstantes und gleichmäßiges Einziehen von Schlacke wird durch Einstellung einer konstanten Relativgeschwindigkeit zwischen Kokille und Strang erreicht;
- eine gleichmäßige Versorgung von Schlacken-Gleitmittel ist bei steigenden Gießgeschwindigkeiten durch Anpassung von Hub und Frequenz möglich;
- insgesamt können höhere Gießgeschwindigkeiten verwirklicht werden.
Es zeigen:
- Fig. 1
- im Diagramm über der Gießgeschwindigkeit aufgetragene Vergleichskurven
für den Verlauf der absoluten Negativ-Strip-Zeit
- a) nach dem Stand der Technik
- b) nach der Erfindung.
- Fig. 2
- Schwingungskurven symmetrischer bzw. asymmetrischer Kokillenoszillation nach dem Stand der Technik.
- Fig. 3
- Schwingungskurven symmetrischer bzw. asymmetrischer Kokillenoszillation nach der Erfindung.
- Tabelle I
- enthält ein Zahlenbeispiel für die Schwingungskurven der Figur 2;
- Tabelle II
- enthält ein Zahlenbeispiel für die Schwingungskurven der Figur 3.
Claims (8)
- Verfahren zum Oszillieren einer Stahlstranggießkokille mittels einer Oszillationseinrichtung, wobei die Hubhöhe in Abhängigkeit von der Strangabzugsgeschwindigkeit eingestellt wird und bei voreilender Geschwindigkeit der Kokille relativ zum Strang, dem sogenannten Negativstrip, flüssiges oder festes Gießmedium in den Spalt zwischen Kokille und Strang eingezogen wird,
dadurch gekennzeichnet, dass zur Erzielung einer möglichst langen absoluten bzw. prozentualen negativen bzw. positiven Strip-Zeit bei konstanter Giessgeschwindigkeit, und einer möglichst konstanten absoluten bzw. prozentualen negativen bzw. positiven Strip-Zeit bei steigender Giessgeschwindigkeit sowohl die Frequenz als auch der Hub der Oszillationsbewegung unabhängig voneinander in dem Sinne variiert werden, dass bei steigender Giessgeschwindigkeit die Beschleunigung der bewegten Kokille durch relative Erniedrigung der Frequenz bei relativ vergrößertem Hub insgesamt verringert wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß die Oszillationsfrequenz in einem Diagramm über der Gießgeschwindigkeit verfolgt wird und bei steigender Gießgeschwindigkeit die Oszillationsfrequenz im Vergleich zum herkömmlichen linearen Anstieg abgesenkt wird, in der Weise, daßa) Zunächst die Oszillationsfrequenz mit geringerer Progression ansteigt undb) anschließend auf annähernd konstante Werte eingestellt wird. - Verfahren nach Anspruch 2,
dadurch gekennzeichnet, daß bei steigender Gießgeschwindigkeit eine relative dynamische Progression der Oszillationsfrequenz unterhalb des herkömmlichen linearen Anstiegs derart erfolgt, daß der Negativstrip um annähernd (20%) verlängert wird. - Verfahren nach einem oder mehreren der Ansprüche 1 bis 3,
dadurch gekennzeichnet, daß unabhängig von dem Verlauf der abgesenkten Oszillationsfrequenz im Verhältnis zur Gießgeschwindigkeit ein dynamisch angepaßter Oszillationshub eingestellt wird. - Verfahren nach einem oder mehreren der Ansprüche 1 bis 4,
dadurch gekennzeichnet, daß die Kokillenoszillation nach einer von der Sinusform abweichenden Form einer Schwingkurve, beispielsweise mit in Grenzen konstanten Relativgeschwindigkeiten zwischen Kokille und Gießstrang eingestellt wird. - Verfahren nach einem oder mehreren der Ansprüche 1 bis 5,
dadurch gekennzeichnet, daß durch freie Vorwahl von Hubhöhe oder Frequenz unabhängig von einem linearen Verhältnis, absolute negative oder positive Strip-Zeiten eingestellt werden. - Verfahren nach einem oder mehren der Ansprüche 1 bis 6,
dadurch gekennzeichnet, daß eine relative Frequenzabsenkung der Oszillation mit beliebigen Oszillationsformen, wie sinoidalen, trapezoiden oder sägezahnförmigen Oszillationsformen durchgeführt wird. - Verfahren nach einem oder mehreren der Ansprüche 1 bis 7,
gekennzeichnet durch
die Verwendung eines hydraulischen Oszillators zur variablen Einstellung von Hub und Frequenz der Kokillenoszillation.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19854329 | 1998-11-25 | ||
DE19854329A DE19854329A1 (de) | 1998-11-25 | 1998-11-25 | Verfahren zum Oszillieren einer Stranggießkokille mittels variabler Oszillationsparameter |
PCT/EP1999/008836 WO2000030783A1 (de) | 1998-11-25 | 1999-11-17 | Verfahren zum oszillieren einer stranggiesskokille mittels variabler oszillationsparameter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1133370A1 EP1133370A1 (de) | 2001-09-19 |
EP1133370B1 true EP1133370B1 (de) | 2002-09-04 |
Family
ID=7888938
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99958061A Expired - Lifetime EP1133370B1 (de) | 1998-11-25 | 1999-11-17 | Verfahren zum oszillieren einer stranggiesskokille mittels variabler oszillationsparameter |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1133370B1 (de) |
KR (1) | KR100634049B1 (de) |
AT (1) | ATE223268T1 (de) |
DE (2) | DE19854329A1 (de) |
ES (1) | ES2183628T3 (de) |
MX (1) | MXPA01005160A (de) |
WO (1) | WO2000030783A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101105905B1 (ko) * | 2004-12-27 | 2012-01-17 | 주식회사 포스코 | 스테인리스 304강의 연주주편 제조방법 |
DE102017213647A1 (de) * | 2017-03-29 | 2018-10-04 | Sms Group Gmbh | Stranggießanlage und Verfahren zu deren Betrieb |
DE102018215566A1 (de) | 2018-09-13 | 2020-03-19 | Sms Group Gmbh | Verfahren und Computerprogrammprodukt zum Betreiben einer Oszillationsvorrichtung sowie die entsprechende Oszillationsvorrichtung |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2002366B1 (de) * | 1970-01-14 | 1971-01-21 | Mannesmann Ag | Sinusfoermige Kokillenbewegung beim Stranggiessen |
US4577277A (en) * | 1983-03-07 | 1986-03-18 | Kabushiki Kaisha Kobe Seiko Sho | Method and apparatus of continuous casting by the use of mold oscillating system |
DE3343479C1 (de) * | 1983-12-01 | 1984-08-23 | Fried. Krupp Gmbh, 4300 Essen | Verfahren zum Oszillieren einer in sich starren Horizontal-Stranggiesskokille fuer Metalle,insbesondere Stahl |
DE3704793A1 (de) * | 1987-02-16 | 1988-08-25 | Thyssen Edelstahlwerke Ag | Hubvorrichtung an einer stranggusskokille |
ES2032609T3 (es) * | 1988-01-28 | 1993-02-16 | Clecim | Procedimiento y dispositivo para la oscilacion de una lingotera de colada continua de acero. |
FR2689045B1 (fr) * | 1992-03-31 | 1994-06-24 | Clecim Sa | Procede de coulee continue. |
EP0618023B1 (de) * | 1992-09-22 | 1998-06-17 | Kawasaki Steel Corporation | STRANGGIESSEN VON BRAMMEN IN OSZILLIERENDER KOKILLE MIT HORIZONTAL ZURüCKZIEBAREN WÄNDEN |
-
1998
- 1998-11-25 DE DE19854329A patent/DE19854329A1/de not_active Withdrawn
-
1999
- 1999-11-17 ES ES99958061T patent/ES2183628T3/es not_active Expired - Lifetime
- 1999-11-17 WO PCT/EP1999/008836 patent/WO2000030783A1/de active IP Right Grant
- 1999-11-17 AT AT99958061T patent/ATE223268T1/de active
- 1999-11-17 MX MXPA01005160A patent/MXPA01005160A/es not_active IP Right Cessation
- 1999-11-17 KR KR1020017006319A patent/KR100634049B1/ko not_active IP Right Cessation
- 1999-11-17 DE DE59902597T patent/DE59902597D1/de not_active Expired - Lifetime
- 1999-11-17 EP EP99958061A patent/EP1133370B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ATE223268T1 (de) | 2002-09-15 |
MXPA01005160A (es) | 2005-06-20 |
KR20010080508A (ko) | 2001-08-22 |
WO2000030783A1 (de) | 2000-06-02 |
DE59902597D1 (de) | 2002-10-10 |
KR100634049B1 (ko) | 2006-10-16 |
ES2183628T3 (es) | 2003-03-16 |
EP1133370A1 (de) | 2001-09-19 |
DE19854329A1 (de) | 2000-05-31 |
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