EP1369192B1 - Verfahren zur Ermittlung der Position der Sumpfspitze eines Stranggussproduktes durch Aufbringen einer Oszillation - Google Patents
Verfahren zur Ermittlung der Position der Sumpfspitze eines Stranggussproduktes durch Aufbringen einer Oszillation Download PDFInfo
- Publication number
- EP1369192B1 EP1369192B1 EP03005763A EP03005763A EP1369192B1 EP 1369192 B1 EP1369192 B1 EP 1369192B1 EP 03005763 A EP03005763 A EP 03005763A EP 03005763 A EP03005763 A EP 03005763A EP 1369192 B1 EP1369192 B1 EP 1369192B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oscillation
- roller frame
- continuous casting
- charactensed
- 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.)
- Expired - Lifetime
Links
- 230000010355 oscillation Effects 0.000 title claims abstract description 13
- 238000009749 continuous casting Methods 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 20
- 229910001338 liquidmetal Inorganic materials 0.000 claims description 3
- 239000007791 liquid phase Substances 0.000 claims 3
- 239000012071 phase Substances 0.000 claims 1
- 238000005266 casting Methods 0.000 abstract description 12
- 239000007788 liquid Substances 0.000 description 7
- 230000005489 elastic deformation Effects 0.000 description 6
- 238000007711 solidification Methods 0.000 description 6
- 230000008023 solidification Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 241000283153 Cetacea Species 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000011144 upstream manufacturing 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
-
- 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
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
Definitions
- the invention relates to a Method for determining the sump tip in the interior of a cast strand its exit from the mold with a core of liquid metal bypassing Strand shell, which as a result of increasing heat release with increasing Thickness reaches to the solidus point of the marsh tip, and then one solidified continuous casting product, in particular a continuous casting slab formed.
- the result for the casting operation is the requirement to determine as exactly as possible at which point within a slab the swamp tip lies or where the Position of incipient solidification is located.
- the course of the force has in a second approximation the Form of a hysteresis, wherein the propagation of the force, relative to an associated Jaw width as a measure of the viscosity of the liquid in the slab Sumpfes, and depending on the determined viscosity conclusions on the Position of the sump tip to be pulled, as well as adjusted the Maulweitenver too becomes.
- the document EP 0 350 431 B1 describes a method for continuous casting of Slabs with a reduced compared to the cast state thickness, wherein a partially solidified strand between pairs of rollers, driven by means Rolls withdrawn and individual roles against the strand acting deformable are adjustable.
- a partially solidified strand between pairs of rollers, driven by means Rolls withdrawn and individual roles against the strand acting deformable are adjustable.
- the speed, the current consumption of the driven Rolls and their contact pressure detected and each supplied to a controller.
- the Speed of individual driven rollers determining controller is about a parent Regulator adjustable so that by at least one, against stops adjustable, determining the thickness of the strand, on an already solidified Part of the strand deforming acting pair of rollers deform the final dimension and the withdrawal speed of the strand is determined.
- Upstream or downstream Roles are reflected in the speed and power consumption of their drives depending on the shape change of the strand produced by the rollers adjusted from the measured values current consumption, reaction force of Stranges and the roller clearance determines the location of the sump top and the contact pressures the rollers are adjusted so that the sump tip before at least an adjustable against attacks on a predeterminable distance Role pair lies.
- the document DE-OS 25 30 032 discloses a method and an apparatus for Determination of acting on a continuous casting during its solidification Forces in which the cast body emerges from a mold and between passes through several pairs of rolls and in a plane at a distance below the Mold freezes over its entire cross-section.
- the level of complete solidification is detected by measuring on a plurality of roller pairs Compressive forces and comparing the measured values on different pairs of rolls for Determination of that pair of rollers determined, beyond which no further
- the document DE-OS 34 23 977 A1 describes a method for non-contact Measurement of the solidified surface layer of a casting of metal with non-solidified Inner core.
- An alternating magnetic field is applied to the casting, whereby the strength of the eddy currents generated in the casting by a measuring coil means is measured without contact.
- the thickness of a solidified surface layer is determined by the strength of the eddy currents according to the difference of the specific electrical resistance between a non-solidified molten Part and a solidified part of the casting intended.
- Document JP 11083814 A describes a method for determining the state of solidification a casting. It then exists, one with electromagnetic Supersonic acting on a casting element in cooperation with a to provide the supersonic signal receiving switching system, which the Intensity of the propagating ultrasonic waves recorded, evaluated and with each other compares.
- the document JP 63174770 describes another method for determining the not solidified end of a cast strand.
- a variety of roles are at horizontal area of a continuous casting plant and provided with a number of Pressure sensors in the axial direction of the surfaces provided by these rollers.
- the lateral pressure in the strand through in the Roller detects existing sensors.
- the position and shape of the not solidified part found in the casting.
- the invention has the object underlying to show a method by which the mechanical or dynamic Properties of a forced oscillatory moving system measured and for direct determination of the system status of a cast strand be used to determine the location of the swamp tip exactly.
- the invention takes advantage of the fact that the mechanical or dynamic Properties of a cast slab depending on its Consistency, e.g. As solid or liquid or mixtures, at the distance of Change the mold outlet to the bottom.
- the position of the sump tip can be derived from the phase angle ( ⁇ ).
- the coordinate system shows that at maximum reactive power P B , where the angle of P S approaches 90 °, the active power P W decreases towards zero, whereas with a tendency to decrease the reactive power P B towards zero, the active power P W approaches a maximum tends.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
Der Strang verhält sich dabei in erster Näherung wie eine Stahlfeder. Durch die Oszillation wird nur in sehr geringem Maße Energie in das System eingebracht und damit auch praktisch keine Wirkleistung benötigt, der Phasenwinkel (ϕ) ist vergleichsweise groß.
Dieser Bereich ist geprägt durch einen hohen Anteil an flüssigem Metall. Durch die Oszillation erfolgt im flüssigen Bereich keine elastische Verformung. Für diese nicht elastische Verformung wird im Gegensatz zur Durcherstarrung Wirkleistung benötigt, z. B. für das Hin- und Herpumpen der flüssigen Schmelze.
Der Phasenwinkel (ϕ) ist vergleichsweise klein.
Da hier sowohl elastische als auch nicht elastische Verformung stattfindet, bewegt sich der Phasenwinkel (ϕ) im mittleren Bereich.
- Figur 1
- den Phasenwinkel (ϕ) der Scheinleistung im Koordinatensystem in Abhängigkeit von der Wirkleistung PW der Abszisse, und der Blindleistung PB der Ordinate,
- Figur 2
- den Phasenwinkel (ϕ) in Abhängigkeit von der Durcherstarrung einer Bramme unterhalb einer Kokille.
- Bei der Strangführung:
- Die Sumpfspitze kann "bis zur letzten Rolle getrieben werden".
Das bedeutet eine Maximierung der Produktivität. - Die Dynamische Softreduction wird präziser und damit effektiver, da sie
genauer in den Bereich der Sumpfspitze gelegt werden kann.
Das bedeutet eine Verbesserung der Brammenqualität.
- Die Sumpfspitze kann "bis zur letzten Rolle getrieben werden".
Claims (7)
- Verfahren zur Ermittlung der Sumpfspitze im Innern eines Gussstranges nach dessen Austritt aus der Kokille mit einer einen Kern aus flüssigem Metall umgehenden Strangschale, die infolge zunehmender Wärmeabgabe mit wachsender Dicke bis zum Solidus-Punkt der Sumpfspitze reicht, und dann ein durcherstarrtes Stranggussprodukt, insbesondere eine Stranggussbramme
ausbildet,
dadurch gekennzeichnet, dass dem Stranggussprodukt mit Hilfe eines Rollengerüstes der Stranggussanlage eine Oszillation aufgezwungen wird und dabei die aufgebrachte mechanische Leistung bzw. Arbeit in einem Koordinatensystem anteilig in Schein- (PS), Wirk- (PW) und Blindleistung bzw. Arbeit (PB) zerlegt, und aus einem daraus herleitbaren Phasenwinkel (ϕ) des Koordinatensystems nach Maßgabe dieser Anteile die Position der Sumpfspitze ermittelt wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass eine Oszillationsfrequenz zwischen 0,5 und 10 Hz und vorzugsweise zwischen 1 und 4 Hz eingestellt wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass eine Oszillationsamplitude zwischen 0,1 und 1 mm und vorzugsweise zwischen 0,2 und 0,4 mm eingestellt wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass Oszillationsfrequenz und/oder Oszillationsamplitude während der Messung modifiziert werden. - Verfahren nach einem oder mehreren der Ansprüche 1 bis 4,
dadurch gekennzeichnet, dass der gesamte Segmentoberrahmen des Rollengerüstes oszilliert wird. - Verfahren nach einem oder mehreren der Ansprüche 1 bis 5,
dadurch gekennzeichnet, dass der Segmenteinlauf bzw. der Segmentauslauf des Rollengerüstes oszilliert wird. - Verfahren nach einem oder mehreren der Ansprüche 1 bis 6,
dadurch gekennzeichnet, dass die Oszillationsenergie direkt in die entsprechenden Segmente des Rollengerüstes beispielsweise über deren Hydraulikzylinder eingeleitet wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10224533A DE10224533A1 (de) | 2002-05-31 | 2002-05-31 | Verfahren zur Ermittlung der Reibkraft bei einem erzwungenen Schwingungen ausgesetzten System |
DE10224533 | 2002-05-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1369192A1 EP1369192A1 (de) | 2003-12-10 |
EP1369192B1 true EP1369192B1 (de) | 2005-07-20 |
Family
ID=29432596
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03005763A Expired - Lifetime EP1369192B1 (de) | 2002-05-31 | 2003-03-14 | Verfahren zur Ermittlung der Position der Sumpfspitze eines Stranggussproduktes durch Aufbringen einer Oszillation |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1369192B1 (de) |
AT (1) | ATE299764T1 (de) |
DE (2) | DE10224533A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10349962B3 (de) * | 2003-10-24 | 2005-06-02 | Ingo Dr. Schubert | Anordnung zur Ermittlung der Konsistenz eines Gießstranges in einer Stranggießalage und/oder Maulweite derselben |
DE102006016375B4 (de) * | 2006-04-05 | 2023-02-16 | Sms Group Gmbh | Verfahren und Einrichtung zum Bestimmen der Kernerstarrung und/oder der Sumpfspitze beim Stranggießen von Metallen, insbesondere von Stahlwerkstoffen |
DE102006047013B3 (de) * | 2006-10-02 | 2008-05-29 | Betriebsforschungsinstitut VDEh - Institut für angewandte Forschung GmbH | Verfahren zur Ermittlung einer flüssigen Phase im Innern eines an seiner Oberfläche bereits erstarrten Strangs |
ITMI20121185A1 (it) * | 2012-07-05 | 2014-01-06 | Danieli Off Mecc | Metodo di determinazione della posizione di chiusura del cono liquido nella colata continua di prodotti metallici |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19720768C1 (de) * | 1997-05-07 | 1999-01-14 | Mannesmann Ag | Verfahren und Vorrichtung zum Erzeugen von Brammen aus Stahl |
DE10039016B4 (de) * | 2000-08-10 | 2010-02-25 | Sms Siemag Aktiengesellschaft | Verfahren zum Erzeugen von Brammen aus Stahl |
-
2002
- 2002-05-31 DE DE10224533A patent/DE10224533A1/de not_active Withdrawn
-
2003
- 2003-03-14 EP EP03005763A patent/EP1369192B1/de not_active Expired - Lifetime
- 2003-03-14 AT AT03005763T patent/ATE299764T1/de active
- 2003-03-14 DE DE50300792T patent/DE50300792D1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE50300792D1 (de) | 2005-08-25 |
EP1369192A1 (de) | 2003-12-10 |
ATE299764T1 (de) | 2005-08-15 |
DE10224533A1 (de) | 2003-12-18 |
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