WO2009152940A1 - Device and method for detecting the danger of a breakout of a steel strand during the continuous casting of steel - Google Patents
Device and method for detecting the danger of a breakout of a steel strand during the continuous casting of steel Download PDFInfo
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- WO2009152940A1 WO2009152940A1 PCT/EP2009/003789 EP2009003789W WO2009152940A1 WO 2009152940 A1 WO2009152940 A1 WO 2009152940A1 EP 2009003789 W EP2009003789 W EP 2009003789W WO 2009152940 A1 WO2009152940 A1 WO 2009152940A1
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- side plates
- measuring sensors
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- 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 device for detecting the risk of breakdown by finning a steel strand in the continuous casting of steel in a broad side plates and narrow side plates having casting mold with measuring sensors that provide measurement signals to an evaluation.
- thermocouples are currently used, which are not arranged in the immediate edge region of the narrow side plates of the mold. Also on the wide side plates of the mold thermocouples are attached. With the help of these thermocouples, it is only with insufficient accuracy that the formation of fins can be detected early enough. If used successfully, a premature casting break is performed as a countermeasure to prevent the threat of strand breakage. Here, the effect of a strand connector on the temperature measurements is evaluated. The detected result does not therefore correspond to the fin itself, but rather to the resulting effect that the cast strand is not further promoted.
- Breakthroughs due to finning are characterized by leakage of liquid steel and are avoided with this strategy.
- this premature casting demolition is accompanied by the laborious feeding out of the residual strand.
- DE 101 08 730 A1 discloses a device for detecting the risk of breakage of a steel strand during the continuous casting of steel in a casting mold with its measuring signals to an evaluation device supplying measuring sensors which are spaced apart in at least two, preferably four
- BESTATlGUNGSKOPfE and arranged normal to the conveying direction temperature measuring planes are distributed around the circumference of the casting mold.
- At least one of the temperature measurement planes is arranged in the first half of the casting mold which has passed through in the conveying direction, and at least one of the temperature measurement planes is arranged in the lower half, which is passed through in the conveying direction.
- the first temperature measuring plane is arranged close to the temperature maximum of the cooking hot side to be expected in the casting mold during stationary casting or below this level.
- DE 101 08 730 A1 specifies a method with which the continuous casting of steel in a casting mold is to be monitored, in which at least two spaced in the conveying direction temperature measurement planes of the course of existing in the respective temperature measurement temperature level in the respective Temperature measurement level is detected in the casting mold arranged measuring sensors and in which, given the presence of various criteria is issued on the risk of breakthrough of the steel strand indicative distress signal.
- These accidents include the formation of the Finns.
- the subsequently solidified steel forms a so-called fin or steel tongue, through the mechanical friction of the further conveying of the strand additional forces are transmitted to the formed strand shell box.
- the wedged strand shell can rupture (bleeders) or be entrained by the adjacent regions.
- the strand shell grows above the crack seam, it comes in the latter area to lift the strand shell of the mold plates.
- the temperature profile in the mold differs from that of the trouble-free casting operation. If liquid steel reaches the copper plates of the walls when the hot melt flows in during trouble-free casting, the local temperature values increase. After the start of the actual casting The temperature increase proceeds continuously from an upper temperature measuring plane in the mold facing the filling area to a process-dependent temperature level.
- this object is achieved in a device of the type mentioned in that first measuring sensors are arranged in the immediate edge region of the narrow side plates in the adjoining region to the broad side plates of the casting mold.
- thermocouples By introducing additional thermocouples in the edge region of the narrow side of the mold, the prediction accuracy of the fin formation is significantly increased and, in addition, the defect is recognized at a much earlier stage.
- the additional thermocouple is mounted at a very small distance to the edge of the narrow-side plate in the abutting portion of the broadside plate and therefore enables a location-accurate temperature measurement.
- the first measuring sensors are introduced at a distance of 15 mm or less from the edges of the narrow side plates in the area adjacent to the wide side plates into the outer surfaces of the decorative plates.
- thermocouples are inclined in the adjoining region to the broad side plates introduced into extending from the outer surfaces of the narrow side plates bores.
- the first measuring sensors for example, at an angle of at least 15 ° in the direction of the broad side plates in the holes are inclined.
- the first measuring sensors are designed as thermocouples.
- further measuring sensors are attached to the narrow side plate of the casting mold in a horizontal row with the first measuring sensors. This makes it possible to determine temperature differences between the first measuring sensors on the one hand and adjacent measuring sensors on the other hand. Further measuring possibilities are created if, in addition, the measuring sensors are arranged in at least two horizontally one above the other running rows on the narrow side plates of the G cumkokiüe.
- the device comprises an evaluation device which detects the temperature differences between the first and the further measuring sensors.
- the first and the further measuring sensors are introduced into holes of the same depth.
- an optimal comparability of the measured by the measuring sensors tendencies in the temperature development to.
- the temperature difference between the adjacent thermocouple and the thermocouple located on the edge is to be evaluated for the fin detection.
- the range of temperature differences in the state without fin formation characterizes the normal state. With the aid of the confidence interval, a limit range for a still permissible temperature difference can be determined. Thus, by the Finnentetation premature casting breaks can be avoided by finned. This is done by initiating corrective actions analogous to FIG. 3.
- the invention also relates to a method for detecting the risk of breakage by finning a steel strand in the continuous casting of steel in a broad side plates and narrow side plates having casting mold with measuring sensors that provide measurement signals to an evaluation.
- the method is characterized in that first measuring sensors in the immediate edge region of the narrow side plates in the adjacent tion range to the broad side plates of the casting mold produce temperature signals that are evaluated in the evaluation with regard to the formation of fins. Due to the signals provided by the measuring sensors, it is possible to adopt strategies such as the method of the plates on the narrow sides of the mold or an increase in the broad-side contact pressure.
- measures are taken to influence the casting process on the basis of the temperature signals evaluated by the evaluation device in the event of the risk of the formation of fins.
- the inventive measures the fin formation is suppressed and allows a scheduled termination of the casting without premature casting.
- Figure 1 is a schematic perspective view of a continuous casting mold in the broken state with measuring sensors for temperature detection in their side walls.
- FIG. 2 shows an enlarged plan view of a sectional plane of a narrow-side plate of the continuous casting mold corresponding to a section line II-II from FIG. 1;
- a casting mold 1 (FIG. 1) for the continuous casting of steel comprises copper plates 2, 3 on its broad sides and copper plates 4, 5 on its narrow sides for casting a steel strip 6, which is supplied as liquid metal via a feed line 7.
- the plates 4, 5 are adjustable in their spacing, so that the width of the steel strip 6 is variable while the thickness is fixed.
- the thickness is for example between 40 and 100 mm.
- the width varies between 1000 and 1600 mm.
- thermocouples 8 In the wide-side plates 4, 5 designed as thermocouples and each arranged in three rows measuring sensors 8 are provided. Each of the thermocouples 8 supplies at certain time intervals temperature signals to an evaluation device, not shown here.
- thermocouples are also arranged in three rows.
- edge near thermocouples 11, 12 are provided.
- the near-edge thermocouples 11, 12 are each introduced into holes 13, 14, which are arranged inclined in the direction of the broad side plates 4, 5, to allow temperature detection in close proximity to the broadsides.
- Figure 3 shows a control loop or a control for maintaining the casting process in Finnnen Struktur.
- the formation of the fins is detected by evaluating the measuring signals of the thermocouples 8 - 12 in the copper plate 2, 3 of the mold in an evaluation device 20. If the risk of the formation of fins is detected, this risk is due to a change in the casting speed Vc, a change in the Narrow side inclination or the position of the narrow sides and / or by a change in the clamping By virtue of the broad sides, that is counteracted by the mold walls. In this way, attempts are also made or avoided to avoid a casting break and to maintain the Gisßlui.
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Abstract
A device for detecting the danger of a breakout by the formation of ridges in a steel strand (6) during the continuous casting of steel in a casting mold (1) comprising broad-side plates (2, 3) and narrow-side plates (4, 5), having measuring sensors (8) which provide measuring signals to an evaluation unit, is characterized in that first measuring sensors (11, 12) are arranged directly in the edge region of the narrow-side plates (4, 5) in the neighboring region to the broad-side plates (2, 3) of the casting mold (1).
Description
Vorrichtung und Verfahren zum Erkennen der Gefahr eines Durchbruchs eines Stahlstrangs beim Stranggießen von Stahl Apparatus and method for detecting the risk of breakage of a steel strand in the continuous casting of steel
Die Erfindung bezieht sich auf Vorrichtung zum Erkennen der Gefahr eines Durchbruchs durch Finnenbildung eines Stahlstrangs beim Stranggießen von Stahl in einer Breitseitenplatten und Schmalseitenplatten aufweisenden Gießkokille mit Messsensoren, die Messsignale an eine Auswerteeinrichtung liefern.The invention relates to a device for detecting the risk of breakdown by finning a steel strand in the continuous casting of steel in a broad side plates and narrow side plates having casting mold with measuring sensors that provide measurement signals to an evaluation.
Um Strangabrisse durch Finnenbildung in einer Gießkokille zum Stranggießen von Stahl zu vermeiden, werden zur Zeit Thermoelemente verwendet, die nicht in unmittelbarem Kantenbereich der Schmalseitenplatten der Kokille angeordnet sind. Auch an den Breitseitenplatten der Kokille sind Thermoelemente angebracht. Mit Hilfe dieser Thermoelemente lässt sich nur mit unzureichender Ge- nauigkeit die Bildung von Finnen frühzeitig genug erkennen. Bei erfolgreicher Anwendung wird als Gegenmaßnahme ein vorzeitiger Gießabbruch durchgeführt, um einem drohenden Strangabriss vorzubeugen. Hierbei wird die Auswirkung eines Strangsteckers auf die Temperaturmessungen bewertet. Das detek- tierte Ergebnis entspricht damit nicht der Finne selbst, sondern vielmehr der sich daraus ergebenden Wirkung, dass der Gießstrang nicht weitergefördert wird.To avoid strand breaks by finning in a casting mold for continuous casting of steel, thermocouples are currently used, which are not arranged in the immediate edge region of the narrow side plates of the mold. Also on the wide side plates of the mold thermocouples are attached. With the help of these thermocouples, it is only with insufficient accuracy that the formation of fins can be detected early enough. If used successfully, a premature casting break is performed as a countermeasure to prevent the threat of strand breakage. Here, the effect of a strand connector on the temperature measurements is evaluated. The detected result does not therefore correspond to the fin itself, but rather to the resulting effect that the cast strand is not further promoted.
Durchbrüche, bedingt durch Finnenbildung, sind durch das Auslaufen von flüssigem Stahl gekennzeichnet und werden mit dieser Strategie vermieden. Als Nachteil ist jedoch zu sehen, dass dieser vorzeitige Gießabbruch mit dem mühsamen Ausfördern des Reststranges einhergeht.Breakthroughs due to finning are characterized by leakage of liquid steel and are avoided with this strategy. As a disadvantage, however, can be seen that this premature casting demolition is accompanied by the laborious feeding out of the residual strand.
Aus der DE 101 08 730 A1 ist eine Vorrichtung zum Erkennen der Gefahr eines Durchbruchs eines Stahlstrangs beim Stranggießen von Stahl in einer Gießko- kille mit ihre Messsignale an eine Auswerteeinrichtung liefernden Messsensoren bekannt, die in mindestens zwei, bevorzugt vier, beabstandet zueinanderDE 101 08 730 A1 discloses a device for detecting the risk of breakage of a steel strand during the continuous casting of steel in a casting mold with its measuring signals to an evaluation device supplying measuring sensors which are spaced apart in at least two, preferably four
BESTATlGUNGSKOPfE
und normal zur Förderrichtung angeordneten Temperaturmessebenen um den Umfang der Gießkokille verteilt angeordnet sind.BESTATlGUNGSKOPfE and arranged normal to the conveying direction temperature measuring planes are distributed around the circumference of the casting mold.
Mindestens eine der Temperaturmessebenen ist in der in Förderrichtung zuerst durchlaufenen oberen Hälfte der Gießkokille angeordnet, und mindestens eine der Temperaturmessebenen ist in der in Förderrichtung durchlaufenen unteren Hälfte angeordnet. Die erste Temperaturmeßebene ist nahe dem in der Gießkokille beim stationären Gießen zu erwartenden Temperaturmaximum der Ko- killenheißseite oder unterhalb dieser Ebene angeordnet.At least one of the temperature measurement planes is arranged in the first half of the casting mold which has passed through in the conveying direction, and at least one of the temperature measurement planes is arranged in the lower half, which is passed through in the conveying direction. The first temperature measuring plane is arranged close to the temperature maximum of the cooking hot side to be expected in the casting mold during stationary casting or below this level.
Ebenso wird in der DE 101 08 730 A1 ein Verfahren angegeben, mit dem das Stranggießen von Stahl in einer Gießkokille überwacht werden soll, bei dem in mindestens zwei in Förderrichtung beabstandet zueinander angeordneten Temperaturmessebenen der Verlauf der in der jeweiligen Temperaturmessebene vorhandenen Temperatur mittels in der jeweiligen Temperaturmessebene in der Gießkokille angeordneter Messsensoren erfasst wird und bei dem bei Vorliegen verschiedener Kriterien ein auf die Gefahr eines Durchbruchs des Stahlstrangs hinweisendes Notsignal abgegeben wird. Zu diesen Störfällen gehört auch die Finnenbildung. Hierbei geht man davon aus, dass infolge eines erhöhten Spaltmaßes im Bereich zwischen den den Strangschalenkasten der Kokille bildenden Seitenplatten der Schmalseite und der Breitseite der noch flüssige Stahl in diesen Bereich eindringt. Der nachfolgend erstarrte Stahl bildet eine sogenannte Finne oder Stahizunge, durch deren mechanische Reibung beim weiteren Abfördern des Stranges zusätzliche Kräfte auf den gebildeten Strangschalenkasten übertragen werden. Hierbei kann die verkeilte Strangschale auf- reißen (Bluter) oder von den benachbarten Bereichen mitgerissen werden. Während die Strangschale oberhalb der Rissnaht wächst, kommt es im letztgenannten Bereich zum Abheben der Strangschale von den Kokillenplatten. Hierbei weicht das Temperaturprofil in der Kokille von dem des störungsfreien Gießbetriebs ab. Gelangt beim störungsfreien Gießbetrieb beim Hineinfließen der heißen Schmelze flüssiger Stahl an die Kupferplatten der Wände, so steigen die örtlichen Temperaturwerte an. Nach dem Start des eigentlichen Gieß-
Vorgangs setzt sich der Temperaturanstieg ausgehend von einer oberen, dem Einfüllbereich zugewandten Temperaturmessebene in der Kokille kontinuierlich auf ein prozessabhängiges Temperaturniveau fort.Likewise, DE 101 08 730 A1 specifies a method with which the continuous casting of steel in a casting mold is to be monitored, in which at least two spaced in the conveying direction temperature measurement planes of the course of existing in the respective temperature measurement temperature level in the respective Temperature measurement level is detected in the casting mold arranged measuring sensors and in which, given the presence of various criteria is issued on the risk of breakthrough of the steel strand indicative distress signal. These accidents include the formation of the Finns. Here, it is assumed that due to an increased gap in the area between the side shell plates forming the strand shell of the mold forming side of the narrow side and the broad side of the still liquid steel penetrates into this area. The subsequently solidified steel forms a so-called fin or steel tongue, through the mechanical friction of the further conveying of the strand additional forces are transmitted to the formed strand shell box. In this case, the wedged strand shell can rupture (bleeders) or be entrained by the adjacent regions. While the strand shell grows above the crack seam, it comes in the latter area to lift the strand shell of the mold plates. In this case, the temperature profile in the mold differs from that of the trouble-free casting operation. If liquid steel reaches the copper plates of the walls when the hot melt flows in during trouble-free casting, the local temperature values increase. After the start of the actual casting The temperature increase proceeds continuously from an upper temperature measuring plane in the mold facing the filling area to a process-dependent temperature level.
Fließt jedoch beim Füllen der Kokille infolge eines vorhandenen Spaltes zwi- sehen den die Schmalseiten bildenden Wänden und den die Breitseiten bildenden Wänden flüssiger Stahl ein, so wird aufgrund der dort entstehenden Finne das Abfördern der Stahlstranges örtlich behindert oder blockiert. Die in den oberen Temperaturmessebenen erfassten Temperaturen fallen wegen des anomal starken Wachstums des Stahlstrangs sogar ab.However, flows when filling the mold due to an existing gap between see the narrow sides forming walls and the broad sides forming walls of liquid steel, so the discharge of the steel strand is locally hindered or blocked due to the resulting fin there. The temperatures recorded in the upper temperature measurement levels even drop due to the abnormally strong growth of the steel strand.
Es ist die Aufgabe der Erfindung, die bekannte Vorrichtung zum Erkennen der Gefahr eines Durchbruchs durch Finnenbildung eines Stahlstrangs so zu verbessern, dass eine optimale und frühzeitige Erkennung vor dem Entstehen von Finnen möglich wird.It is the object of the invention to improve the known device for detecting the risk of breakage by finning of a steel strand so that an optimal and early detection before the emergence of fins is possible.
Erfindungsgemäß wird diese Aufgabe bei einer Vorrichtung der eingangs genannten Art dadurch gelöst, dass erste Messsensoren im unmittelbaren Kantenbereich der Schmalseitenplatten im Angrenzungsbereich zu den Breitseitenplatten der Gießkokille angeordnet sind.According to the invention this object is achieved in a device of the type mentioned in that first measuring sensors are arranged in the immediate edge region of the narrow side plates in the adjoining region to the broad side plates of the casting mold.
Durch die Einbringung von zusätzlichen Thermoelementen im Kantenbereich der Schmalseite der Kokille wird die Vorhersagegenauigkeit der Finnenbildung deutlich erhöht und zusätzlich der Defekt in einem wesentlich früheren Stadium erkannt. Das Zusatzthermoelement ist in einem sehr geringen Abstand zu der Kante der schmalseitigen Platte im Anstoßbereich der breitseitigen Platte angebracht und ermöglicht daher eine ortsgenaue Temperaturmessung.By introducing additional thermocouples in the edge region of the narrow side of the mold, the prediction accuracy of the fin formation is significantly increased and, in addition, the defect is recognized at a much earlier stage. The additional thermocouple is mounted at a very small distance to the edge of the narrow-side plate in the abutting portion of the broadside plate and therefore enables a location-accurate temperature measurement.
Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen, der Beschreibung und den Zeichnungen.
In vorteilhafter Weise ist vorgesehen, dass die ersten Messsensoren im Abstand von 15 mm oder weniger zu den Kanten der Schmalseitenplatten im An- grenzungsbereich zu den Breitseitenplatten in die Außenflächen der Schmaisei- tenplatten eingebracht sind.Advantageous developments emerge from the subclaims, the description and the drawings. It is advantageously provided that the first measuring sensors are introduced at a distance of 15 mm or less from the edges of the narrow side plates in the area adjacent to the wide side plates into the outer surfaces of the decorative plates.
Von Vorteil ist auch eine Ausgestaltung, gemäß der die ersten Messsensoren im Angrenzungsbereich zu den Breitseitenplatten geneigt in von den Außenflächen der Schmalseitenplatten ausgehende Bohrungen eingebracht sind. Durch diese Anordnung lässt sich zusätzlicher Bauraum für die Erfassung der Thermoelemente geschaffen und gleichzeitig ein sehr geringer Abstand zwischen dem Messsensor und der Kante der Platte realisieren. Die Bohrung wird beispielsweise dadurch realisiert, dass eine vorhergehende Senkung mit gleichem Winkel die Oberfläche der Platte für das Einbringen der Bohrung und des Befestigungsgewindes des Thermoelements vorbereitet.Another advantage is an embodiment according to which the first measuring sensors are inclined in the adjoining region to the broad side plates introduced into extending from the outer surfaces of the narrow side plates bores. By this arrangement, additional space for the detection of the thermocouples can be created and simultaneously realize a very small distance between the measuring sensor and the edge of the plate. The bore is realized, for example, in that a previous countersinking at the same angle prepares the surface of the plate for the introduction of the bore and the fastening thread of the thermocouple.
Diese Form der Anordnung von Messsensoren eröffnet die Möglichkeit, den Gießprozess durch die frühzeitige Detektion der Finne mit geeigneten Gegenmaßnahmen aufrecht zu erhalten. Die Finne wird im Unterschied zu den aus dem Stand der Technik bekannten Lösungen bereits im Entstehen, noch vor dem Erkalten detektiert.This form of arrangement of measuring sensors opens the possibility to maintain the casting process by the early detection of the fin with appropriate countermeasures. In contrast to the solutions known from the prior art, the fin is already being detected, even before it is cooled.
Es erweist sich als vorteilhaft, wenn die die ersten Messsensoren beispielsweise unter einem Winkel von wenigstens 15° in Richtung zu den Breitseitenplatten in den Bohrungen geneigt eingebracht sind. Vorzugsweise sind die ersten Messsensoren als Thermoelemente ausgebildet sind.It proves to be advantageous if the first measuring sensors, for example, at an angle of at least 15 ° in the direction of the broad side plates in the holes are inclined. Preferably, the first measuring sensors are designed as thermocouples.
Zusätzlich lässt sich vorsehen, dass weitere Messsensoren an der Schmalseitenplatte der Gießkokille in einer waagrechten Reihe mit den ersten Messsensoren angebracht sind. Hierdurch ist es möglich, Temperaturunterschiede zwischen den ersten Messsensoren einerseits und benachbarten Messsensoren andererseits zu bestimmen.
Weitere Messmöglichkeiten werden geschaffen, wenn zusätzlich die Messsensoren in wenigstens zwei waagrecht übereinander verlaufenden Reihen an den Schmalseitenplatten der Gießkokiüe angeordnet sind.In addition, it can be provided that further measuring sensors are attached to the narrow side plate of the casting mold in a horizontal row with the first measuring sensors. This makes it possible to determine temperature differences between the first measuring sensors on the one hand and adjacent measuring sensors on the other hand. Further measuring possibilities are created if, in addition, the measuring sensors are arranged in at least two horizontally one above the other running rows on the narrow side plates of the Gießkokiüe.
Vorzugsweise ist auch vorgesehen, dass die Vorrichtung eine Auswerteeinrich- tung umfasst, die die Temperaturdifferenzen zwischen den ersten und den weiteren Messsensoren erfasst.Preferably, it is also provided that the device comprises an evaluation device which detects the temperature differences between the first and the further measuring sensors.
Um eine gute Vergleichbarkeit der von den Messsensoren gelieferten Messwerte zu ermöglichen, ist vorgesehen, dass die ersten und die weiteren Messsen- soren in Bohrungen der gleichen Tiefe eingebracht sind. Dadurch ist eine optimale Vergleichbarkeit der von den Messsensoren gemessenen Tendenzen in der Temperaturentwicklung zu.In order to allow a good comparability of the measured values supplied by the measuring sensors, it is provided that the first and the further measuring sensors are introduced into holes of the same depth. As a result, an optimal comparability of the measured by the measuring sensors tendencies in the temperature development to.
Der Temperaturunterschied zwischen dem benachbarten Thermoelement und dem an der Kante angeordneten Thermoelement ist für die Finnendetektion auszuwerten. Die Bandbreite der Temperaturunterschiede im Zustand ohne Finnenbildung charakterisiert hierbei den Normalzustand. Mit Hilfe des Konfi- denzintervalls (Vertrauensbereichs) kann so ein Grenzbereich für einen noch zulässigen Temperaturunterschied festgelegt werden. Somit können durch die Finnendetektion vorzeitige Gießabbrüche durch Finnenbildung vermieden werden. Dies erfolgt durch die Einleitung von Korrekturmaßnahmen analog zu Figur 3.The temperature difference between the adjacent thermocouple and the thermocouple located on the edge is to be evaluated for the fin detection. The range of temperature differences in the state without fin formation characterizes the normal state. With the aid of the confidence interval, a limit range for a still permissible temperature difference can be determined. Thus, by the Finnentektion premature casting breaks can be avoided by finned. This is done by initiating corrective actions analogous to FIG. 3.
Die Erfindung bezieht sich auch auf ein Verfahren zum Erkennen der Gefahr eines Durchbruchs durch Finnenbildung eines Stahlstrangs beim Stranggießen von Stahl in einer Breitseitenplatten und Schmalseitenplatten aufweisenden Gießkokille mit Messsensoren, die Messsignale an eine Auswerteeinrichtung liefern.The invention also relates to a method for detecting the risk of breakage by finning a steel strand in the continuous casting of steel in a broad side plates and narrow side plates having casting mold with measuring sensors that provide measurement signals to an evaluation.
Erfindungsgemäß ist das Verfahren dadurch gekennzeichnet, dass erste Messsensoren im unmittelbaren Kantenbereich der Schmalseitenplatten im Angren-
zungsbereich zu den Breitseitenplatten der Gießkokille Temperatursignale erzeugen, die in der Auswerteeinrichtung im Hinblick auf die Entstehung von Finnen ausgewertet werden. Aufgrund der von den Messεensoren zur Verfügung gestellten Signale lassen sich Strategien wie das Verfahren der Platten auf den Schmalseiten der Kokille oder eine Erhöhung des Breitseiten-Anpressdrucks.According to the invention, the method is characterized in that first measuring sensors in the immediate edge region of the narrow side plates in the adjacent tion range to the broad side plates of the casting mold produce temperature signals that are evaluated in the evaluation with regard to the formation of fins. Due to the signals provided by the measuring sensors, it is possible to adopt strategies such as the method of the plates on the narrow sides of the mold or an increase in the broad-side contact pressure.
Nach einer Ausgestaltung des Verfahrens ist vorgesehen, dass aufgrund der von der Auswerteeinrichtung ausgewerteten Temperatursignale bei der Gefahr des Entstehens von Finnen Maßnahmen zur Beeinflussung des Gießprozesses eingeleitet werden.According to one embodiment of the method, measures are taken to influence the casting process on the basis of the temperature signals evaluated by the evaluation device in the event of the risk of the formation of fins.
Durch die erfindungsgemäßen Maßnahmen wird die Finnenbildung unterdrückt und ermöglicht eine planmäßige Beendigung des Gusses ohne vorzeitigen Gießbruch.The inventive measures the fin formation is suppressed and allows a scheduled termination of the casting without premature casting.
Nachstehend wird die Erfindung in einem Ausführungsbeispiel anhand der Zeichnungen näher erläutert.The invention will be explained in more detail in an embodiment with reference to the drawings.
Es zeigen:Show it:
Fig. 1 eine schematische perspektivische Ansicht einer Stranggießkokille im aufgebrochenen Zustand mit Messsensoren zur Temperaturerkennung in ihren Seitenwänden;Figure 1 is a schematic perspective view of a continuous casting mold in the broken state with measuring sensors for temperature detection in their side walls.
Fig. 2 eine vergrößerte Draufsicht auf eine Schnittebene einer schmalseiti- gen Platte der Stranggießkokille entsprechend einer Schnittlinie Il - Il aus Fig. 1 ; undFIG. 2 shows an enlarged plan view of a sectional plane of a narrow-side plate of the continuous casting mold corresponding to a section line II-II from FIG. 1; FIG. and
Fig. 3 Regelkreis zur Aufrechterhaltung des Gießprozesses bei Finnenbildung.
Eine Gießkokille 1 (Fig. 1 ) zum Stranggießen von Stahl umfasst an ihren Breitseiten Kupferplatten 2, 3 und an ihren Schmalseiten Kupferplatten 4, 5 zum Gießen eines Stahlbandes 6, das als flüssiges Metall über eine Zuführung 7 zugeführt wird.Fig. 3 control circuit for maintaining the casting process in Finnnenbildung. A casting mold 1 (FIG. 1) for the continuous casting of steel comprises copper plates 2, 3 on its broad sides and copper plates 4, 5 on its narrow sides for casting a steel strip 6, which is supplied as liquid metal via a feed line 7.
Die Platten 4, 5 sind in ihrem Abstand einstellbar, so dass die Breite des Stahlbandes 6 variabel ist, während die Dicke festgelegt ist. Die Dicke liegt beispielsweise zwischen 40 und 100 mm. Die Breite variiert zwischen 1000 und 1600 mm.The plates 4, 5 are adjustable in their spacing, so that the width of the steel strip 6 is variable while the thickness is fixed. The thickness is for example between 40 and 100 mm. The width varies between 1000 and 1600 mm.
In den breitseitigen Platten 4, 5 sind als Thermoelemente ausgebildete und jeweils in drei Reihen angeordnete Messsensoren 8 vorgesehen. Jedes der Thermoelemente 8 liefert in bestimmten zeitlichen Abständen Temperatursignale an eine hier nicht dargestellte Auswerteeinrichtung.In the wide-side plates 4, 5 designed as thermocouples and each arranged in three rows measuring sensors 8 are provided. Each of the thermocouples 8 supplies at certain time intervals temperature signals to an evaluation device, not shown here.
In den schmalseitigen Platten 2, 3 sind ebenfalls in drei Reihen Thermoelemente angeordnet. Zusätzlich zu den bereits im Stand der Technik vorhandenen und im mittleren Bereich der Platten 2, 3 angeordneten Thermoelementen 9, 10 sind erfindungsgemäß kantennahe Thermoelemente 11 , 12 vorgesehen.In the narrow-side plates 2, 3 thermocouples are also arranged in three rows. In addition to the already existing in the prior art and arranged in the central region of the plates 2, 3 thermocouples 9, 10 according to the invention edge near thermocouples 11, 12 are provided.
Die kantennahen Thermoelemente 11 , 12 sind jeweils in Bohrungen 13, 14 eingebracht, die in Richtung zu den breitseitigen Platten 4, 5 geneigt angeordnet sind, um eine Temperaturerfassung in unmittelbarer Nähe zu den Breitseiten zu ermöglichen.The near-edge thermocouples 11, 12 are each introduced into holes 13, 14, which are arranged inclined in the direction of the broad side plates 4, 5, to allow temperature detection in close proximity to the broadsides.
Figur 3 zeigt einen Regelkreis bzw. eine Steuerung zur Aufrechterhaltung des Gießprozesses bei Finnenbildung. Die Finnenbildung wird detektiert durch Auswertung der Messsignale der Thermoelemente 8 - 12 in der Kupferplatte 2, 3 der Kokille in einer Auswerteeinrichtung 20. Wird dabei die Gefahr des Entstehens von Finnenbildung erkannt, so wird dieser Gefahr durch eine Veränderung der Gießgeschwindigkeit Vc, eine Veränderung der Schmalseitenneigung oder der Position der Schmalseiten und/oder durch eine Veränderung der Klemm-
kraft der Breitseiten, dass heißt der Kokillenwände entgegengewirkt. Auf diese Weise wird auch versucht bzw. erreicht einen Gießabbruch zu vermeiden und den Gisßprozess aufrechtzuerhalten.
Figure 3 shows a control loop or a control for maintaining the casting process in Finnnenbildung. The formation of the fins is detected by evaluating the measuring signals of the thermocouples 8 - 12 in the copper plate 2, 3 of the mold in an evaluation device 20. If the risk of the formation of fins is detected, this risk is due to a change in the casting speed Vc, a change in the Narrow side inclination or the position of the narrow sides and / or by a change in the clamping By virtue of the broad sides, that is counteracted by the mold walls. In this way, attempts are also made or avoided to avoid a casting break and to maintain the Gisßprozess.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Gießkokille1 casting mold
2 Kupferplatte 3 Kupferplatte2 copper plate 3 copper plate
4 Kupferplatte4 copper plate
5 Kupferplatte5 copper plate
6 Stahlband6 steel band
7 Zuführung 8 Thermoelemente7 feeder 8 thermocouples
9 Thermoelement9 thermocouple
10 Thermoelement10 thermocouple
11 Thermoelement11 thermocouple
12 Thermoelement 13 Bohrung12 thermocouple 13 hole
14 Bohrung
14 hole
Claims
1. Vorrichtung zum Erkennen der Gefahr eines Durchbruchs eines Stahlstrangs (6) durch Finnenbildung beim Stranggießen von Stahl in einer Breitseitenplatten (2, 3) und Schmalseitenplatten (4, 5) aufweisenden1. Device for detecting the risk of breakage of a steel strand (6) by finning during continuous casting of steel in a broad side plates (2, 3) and narrow side plates (4, 5) having
Gießkokille (1) mit Messsensoren (8), die Messsignale an eine Auswerteeinrichtung liefern, dadurch gekennzeichnet, dass erste der Messsensoren (11 , 12) im unmittelbaren Kantenbereich der Schmalseitenplatten (4, 5) im Angrenzungsbereich zu den Breitseitenplatten (2, 3) der Gießkokille (1 ) angeordnet sind.Casting mold (1) with measuring sensors (8), which deliver measuring signals to an evaluation device, characterized in that first of the measuring sensors (11, 12) in the immediate edge region of the narrow side plates (4, 5) in the adjoining area to the wide side plates (2, 3) of Casting mold (1) are arranged.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die ersten Messsensoren (11 , 12) im Abstand von 15 mm oder weniger zu den Kanten der Schmalseitenplatten (4, 5) im Angrenzungsbereich zu den Breitseitenplatten (2, 3) in die Außenflächen der Schmalseitenplatten (4, 5) eingebracht sind.2. Device according to claim 1, characterized in that the first measuring sensors (11, 12) at a distance of 15 mm or less to the edges of the narrow side plates (4, 5) in the adjoining area to the broad side plates (2, 3) in the outer surfaces of Narrow side plates (4, 5) are introduced.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die ersten Messsensoren (11 , 12) in Richtung zu den Breitseitenplatten (2, 3) geneigt in von den Außenflächen der Schmalseitenplatten (4, 5) ausgehende Bohrungen (13, 14) eingebracht sind.3. Apparatus according to claim 1 or 2, characterized in that the first measuring sensors (11, 12) in the direction of the broad side plates (2, 3) inclined in of the outer surfaces of the narrow side plates (4, 5) outgoing bores (13, 14) are introduced.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die ersten Messsensoren (11 , 12) unter einem Winkel von wenigstens 15° in Richtung zu den Breitseitenplatten (2, 3) in den Bohrungen (13, 14) geneigt eingebracht sind. 4. Apparatus according to claim 3, characterized in that the first measuring sensors (11, 12) at an angle of at least 15 ° in the direction of the broad side plates (2, 3) in the bores (13, 14) are inclined.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die ersten Messsensoren (11 , 12) als Therrnoelernente ausgebildet sind.5. Apparatus according to claim 4, characterized in that the first measuring sensors (11, 12) are designed as Therrnoelernente.
6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass weitere der Messsensoren (9, 10) an der Schmalseitenplatte (4, 5) der Gießkokille (1 ) in einer waagrechten Reihe mit den ersten Messsensoren (11 , 12) angebracht sind.6. Device according to one of claims 1 to 5, characterized in that further of the measuring sensors (9, 10) on the narrow side plate (4, 5) of the casting mold (1) in a horizontal row with the first measuring sensors (11, 12) attached are.
7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Messsensoren (8, 9, 10, 11 , 12) in wenigstens zwei waagrecht übereinander verlaufenden Reihen an den Schmalseitenplatten (4, 5) der Gießkokille (1 ) angeordnet sind.7. Device according to one of claims 1 to 6, characterized in that the measuring sensors (8, 9, 10, 11, 12) in at least two horizontally one above the other extending rows on the narrow side plates (4, 5) of the casting mold (1) are arranged ,
8. Vorrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Vorrichtung eine Auswerteeinrichtung umfasst, die die Tempera- turdifferenzen zwischen den ersten (11 , 12) und den weiteren Messsensoren (8, 9, 10) erfasst.8. Apparatus according to claim 6 or 7, characterized in that the device comprises an evaluation device which detects the temperature differences between the first (11, 12) and the further measuring sensors (8, 9, 10).
9. Vorrichtung nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass die ersten (11 , 12) und die weiteren Messsensoren (8, 9, 10) in Bohrungen (13, 14) der gleichen Tiefe eingebracht sind.9. Device according to one of claims 6 to 8, characterized in that the first (11, 12) and the further measuring sensors (8, 9, 10) in bores (13, 14) of the same depth are introduced.
10. Verfahren zum Erkennen der Gefahr eines Durchbruchs eines Stahlstrangs (6) durch Finnenbildung beim Stranggießen von Stahl in einer Breitseitenplatten (2, 3) und Schmalseitenplatten (4, 5) aufweisenden Gießkokille (1 ) mit Messsensoren (8, 9, 10), die Messsignale an eine10. A method for detecting the risk of breakage of a steel strand (6) by finning during continuous casting of steel in a broad side plates (2, 3) and narrow side plates (4, 5) having Casting mold (1) with measuring sensors (8, 9, 10), the measuring signals to a
Auswerteeinrichtung liefern, dadurch gekennzeichnet, dass erste Messsensoren (11 , 12) im unmittelbaren Kantenbereich der Schmalseitenplatten (4, 5) in Richtung zu den Breitseitenplatten (2, 3) der Gießkokille (1 ) Temperatursignale erzeugen, die in der Auswerteeinrichtung im Hinblick auf die Entstehung von Finnen ausgewertet werden.Supply evaluation device, characterized in that first measuring sensors (11, 12) in the immediate edge region of the narrow side plates (4, 5) in the direction of the broad side plates (2, 3) of the casting mold (1) generate temperature signals in the evaluation device with respect to Origin of Finns are evaluated.
11. Verfahren nach Anspruch 10, dadurch gekennzeichnet, dass aufgrund der von der Auswerteeinrichtung ausgewerteten Temperatursignale bei der Gefahr des Entstehens von Finnen Maßnahmen zur Beeinflussung des Gießprozesses eingeleitet werden, um so den Gießabbruch zu vermeiden und den Gießprozess aufrecht zu erhalten.11. The method according to claim 10, characterized in that initiated due to the evaluated by the evaluation temperature signals at the risk of the formation of fins, measures for influencing the casting process, so as to avoid the casting demolition and to maintain the casting process.
12. Verfahren nach Anspruch 11 , dadurch gekennzeichnet, dass die Schmalseitenplatten (4, 5) verfahren werden und/oder dass der Anpressdruck auf die Breitseitenplatten (2, 3) erhöht wird. 12. The method according to claim 11, characterized in that the narrow side plates (4, 5) are moved and / or that the contact pressure on the broad side plates (2, 3) is increased.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009801229829A CN102066023A (en) | 2008-06-17 | 2009-05-28 | Device and method for detecting the danger of a breakout of a steel strand during the continuous casting of steel |
| EP09765520A EP2291253A1 (en) | 2008-06-17 | 2009-05-28 | Device and method for detecting the danger of a breakout of a steel strand during the continuous casting of steel |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008028752.0 | 2008-06-17 | ||
| DE200810028752 DE102008028752A1 (en) | 2008-06-17 | 2008-06-17 | Apparatus and method for detecting the risk of breakage of a steel strand in the continuous casting of steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2009152940A1 true WO2009152940A1 (en) | 2009-12-23 |
Family
ID=41058634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2009/003789 WO2009152940A1 (en) | 2008-06-17 | 2009-05-28 | Device and method for detecting the danger of a breakout of a steel strand during the continuous casting of steel |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2291253A1 (en) |
| CN (1) | CN102066023A (en) |
| DE (1) | DE102008028752A1 (en) |
| WO (1) | WO2009152940A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3135402A1 (en) | 2015-08-27 | 2017-03-01 | Primetals Technologies Austria GmbH | Mould and method for monitoring a mould |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58145343A (en) * | 1982-02-24 | 1983-08-30 | Nippon Steel Corp | Casting mold for continuous casting |
| WO1983002911A1 (en) * | 1982-02-24 | 1983-09-01 | Yaji, Motoyasu | Method of controlling continuous casting facility |
| JPH0557412A (en) * | 1991-08-28 | 1993-03-09 | Nippon Steel Corp | Method for predicting constrained breakout in continuous casting |
| JPH10193065A (en) * | 1996-12-27 | 1998-07-28 | Daido Steel Co Ltd | Detection of depression in vertical direction of solidified shell in mold in continuous casting |
| DE19843033A1 (en) * | 1998-09-19 | 2000-03-23 | Schloemann Siemag Ag | Break-out recognition process for a continuous casting mold uses temperature rise signals delivered from thermoelements |
| JP2001162358A (en) * | 1999-12-09 | 2001-06-19 | Kawasaki Steel Corp | Method for preventing restrictive breakout in continuous casting |
| JP2001287001A (en) * | 2000-04-05 | 2001-10-16 | Yaskawa Electric Corp | Method for predicting breakout in continuous casting facility and breakout predicting system |
| DE10108730A1 (en) * | 2001-02-23 | 2002-09-12 | Thyssenkrupp Stahl Ag | Device for recognizing the danger of a run-out of steel strand during the continuous casting of steel in a casting mold comprises measuring sensors distributed around the periphery of the casting mold |
| JP2005305511A (en) * | 2004-04-22 | 2005-11-04 | Jfe Steel Kk | Method and unit for observing restrictiv property break-out |
| JP2008043981A (en) * | 2006-08-17 | 2008-02-28 | Nippon Steel Corp | Method for continuously casting steel |
-
2008
- 2008-06-17 DE DE200810028752 patent/DE102008028752A1/en not_active Withdrawn
-
2009
- 2009-05-28 EP EP09765520A patent/EP2291253A1/en not_active Withdrawn
- 2009-05-28 CN CN2009801229829A patent/CN102066023A/en active Pending
- 2009-05-28 WO PCT/EP2009/003789 patent/WO2009152940A1/en active Application Filing
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58145343A (en) * | 1982-02-24 | 1983-08-30 | Nippon Steel Corp | Casting mold for continuous casting |
| WO1983002911A1 (en) * | 1982-02-24 | 1983-09-01 | Yaji, Motoyasu | Method of controlling continuous casting facility |
| JPH0557412A (en) * | 1991-08-28 | 1993-03-09 | Nippon Steel Corp | Method for predicting constrained breakout in continuous casting |
| JPH10193065A (en) * | 1996-12-27 | 1998-07-28 | Daido Steel Co Ltd | Detection of depression in vertical direction of solidified shell in mold in continuous casting |
| DE19843033A1 (en) * | 1998-09-19 | 2000-03-23 | Schloemann Siemag Ag | Break-out recognition process for a continuous casting mold uses temperature rise signals delivered from thermoelements |
| JP2001162358A (en) * | 1999-12-09 | 2001-06-19 | Kawasaki Steel Corp | Method for preventing restrictive breakout in continuous casting |
| JP2001287001A (en) * | 2000-04-05 | 2001-10-16 | Yaskawa Electric Corp | Method for predicting breakout in continuous casting facility and breakout predicting system |
| DE10108730A1 (en) * | 2001-02-23 | 2002-09-12 | Thyssenkrupp Stahl Ag | Device for recognizing the danger of a run-out of steel strand during the continuous casting of steel in a casting mold comprises measuring sensors distributed around the periphery of the casting mold |
| JP2005305511A (en) * | 2004-04-22 | 2005-11-04 | Jfe Steel Kk | Method and unit for observing restrictiv property break-out |
| JP2008043981A (en) * | 2006-08-17 | 2008-02-28 | Nippon Steel Corp | Method for continuously casting steel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3135402A1 (en) | 2015-08-27 | 2017-03-01 | Primetals Technologies Austria GmbH | Mould and method for monitoring a mould |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2291253A1 (en) | 2011-03-09 |
| DE102008028752A1 (en) | 2009-12-24 |
| CN102066023A (en) | 2011-05-18 |
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