EP1071529B1 - Method for continuously casting thin metal strips - Google Patents
Method for continuously casting thin metal strips Download PDFInfo
- Publication number
- EP1071529B1 EP1071529B1 EP99920656A EP99920656A EP1071529B1 EP 1071529 B1 EP1071529 B1 EP 1071529B1 EP 99920656 A EP99920656 A EP 99920656A EP 99920656 A EP99920656 A EP 99920656A EP 1071529 B1 EP1071529 B1 EP 1071529B1
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- Prior art keywords
- strand
- billet
- thickness
- pairs
- driver
- 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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- 238000005266 casting Methods 0.000 title claims abstract description 27
- 239000002184 metal Substances 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims description 12
- 238000009749 continuous casting Methods 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 230000009467 reduction Effects 0.000 claims description 17
- 238000007711 solidification Methods 0.000 claims description 9
- 230000008023 solidification Effects 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 abstract description 20
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 230000001965 increasing effect Effects 0.000 description 9
- 239000007788 liquid Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229920001817 Agar Polymers 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
Definitions
- the invention relates to a method for the continuous casting of thin metal strips in a continuous caster with an oscillating water-cooled mold, one vertical strand guide arranged below with devices for support and cooling the strand until it solidifies, one or more Driver roller pairs, which are used to support and promote the strand against the Extruded, a device for bending the strand and one Device for bending back the strand.
- Thickness (up to about 80 mm) is the small strand thickness due to the special Shaping the mold plates and / or by squeezing the strand with still liquid core reached.
- Methods and devices for the continuous casting of metal strips are for example known from publications EP 0 625 388 A and EP 0 776 708 A.
- the metal strand is stabilized by several hydraulically adjustable rollers before it solidifies deformed.
- the strand is in one immediately after the mold Area in which the core of the strand is still liquid, under corresponding Control of the contact pressure is defined and deformed.
- EP 0 350 431 A describes a continuous casting process for the production of slabs known with a reduced thickness compared to the cast state, in which the partially solidified slabs are supported in a first section by rollers become. In a subsequent section, roles are summarized into segments and are summarized individually or as a segment against the The slab is pressed and deformed. The bottom of the swamp is in the area of Holding segments held. It is then deformed to a certain dimension in a third section.
- EP 0 603 598 A1 describes a method for producing a steel strip known by casting a strand and then rolling. From one Chill becomes a steel strand at a speed of 2 - 20 m / min in one Subtracted thickness of 40 - 50 m. The steel strand is opened between squeeze rollers less than 30 mm, especially 10 - 25 mm, squeezed together. In a roll stand the steel strand is rolled down to the final dimension of 2 - 25 mm with a Degree of deformation of> 20%, but primarily 30%.
- a continuous caster as can be seen in the company brochure "CSP / Compact Strip Production / The new casting and rolling process for economical strip production" No. W4 + 9/319 / Forma SMS Schloemann-Siemag Aktiengesellschaft / 4000/8/87. typically consists of an oscillating mold, a vertical strand guide arranged underneath with water nozzles for cooling the strand until it solidifies and one or more driven roller pairs for conveying the strand out. In order that the strand can be conveyed out of the casting plant, the driver rollers are pressed against the strand with a certain pressure, which prevents them from slipping.
- a special feature of these continuous casting machines is the arrangement of the driver rollers for conveying the strand below the solidification point, the absence of the liquid core in the strand ensuring that the strand does not give in to the driver roller pressure and a sufficiently large tensile force is generated on the strand.
- the state of the art here is to press the drive rollers onto the strand with hydraulic cylinders, the pressure being unchangeable during the casting process. This solution has also proven itself when casting low-carbon and austenitic stainless steels.
- the roll pressure required to generate the discharge force leads to a reduction in the thickness of the strand.
- the required contact pressure of the driver rollers is set much higher in practice than would actually be sufficient to exclude with certainty the risk of the driver rollers slipping, which means that the strand gets stuck.
- the strand is rolled in an uncontrolled manner by the driver rollers, with thickness reductions of, for example, up to 8 mm at 60 mm strand thickness.
- the required discharge force can then be increased by increasing the number of roller pairs, by increasing the roll diameter and by driving everyone Roles can be achieved.
- the task set is procedural with the measures of the labeling part of claim 1 in a method for continuous casting of thin Metal strips in a continuous caster with an oscillating, water-cooled Mold and a vertical strand guide arranged underneath solved that for the defined thickness reduction of the strand of at least 2%, based on the strand thickness at the time the strand solidified, and at least to keep a predetermined set strand thickness constant two pairs of driver rollers continuously during the entire casting process a pressure against the strand immediately after it has solidified be pressed being connected by a hydraulic pump Measuring and control device, in which the generated current as manipulated variables Flow strand thicknesses continuously and with the preset target strand thickness be compared to that of the hydraulic pump over hydraulic Piston cylinder units generated variable contact pressure of at least two driver roller pairs is continuously regulated "online”.
- this rolling is carried out in a controlled manner with a total strand thickness reduction, which is at least 2%.
- the thickness reduction is at least 2% so large that the driven rollers cannot slip and it can be so large that the benefits of an increased Strand thickness in the area of the mold and the secondary cooling come into their own.
- This controlled reduction in the thickness of the strand while keeping it constant a preset target strand thickness by at least two Driver roller pairs is achieved according to the invention in that at least a pair of driver rollers that convey the strand with a changeable defined one Continuous pressure against the strand immediately after it has solidified is pressed.
- the current roller spacing corresponds to the strand thickness, recorded by measurement and in a measuring and control device with the preset target strand thickness compared.
- a hydraulic Pump which is connected to the measuring and control device, the Contact pressure, with which the driver roller pair is pressed against the strand, "Online" regulated so that the specified target strand thickness is always obtained and is preserved.
- the strand conveying driver roller pairs with a changeable contact pressure against portable stops pressed.
- the portable stops are placed in corresponding positions brought so that there is a constant roller distance corresponding to the Target strand thickness results.
- the pressure against the stops is there at least so large that the roller spacing in normal casting operation remains unchanged and it is guaranteed that when going through the Cold strand or in the event of casting malfunctions, the pairs of rollers can open.
- a continuous caster according to the invention consists of a strand guide arranged vertically below an oscillating mold with devices for supporting and cooling and, if necessary, for squeezing the strand until it solidifies, at least one pair of driver rollers which are pressed against the strand for supporting and conveying the strand, a device for bending the strand and a device for bending back the strand.
- At least one pair of driver rollers is connected directly below the solidification point of the strand with means for generating a variable contact pressure.
- These means which can be piston-cylinder units fed by a hydraulic pump, are connected to a measuring and regulating device.
- the measuring and control device continuously measures the current strand thickness between the pair of driver rollers via a measuring sensor, for example an inductive displacement sensor, compares this measured value with a previously set target value and regulates "online" the deviations from this target value of the contact pressure to be applied by the corresponding piston-cylinder unit.
- continuous casting system are at arranged at least one pair of driver rollers, portable stops, against which the pressing means, for example piston cylinder units, with changeable contact pressure.
- the portable Stops are designed so that a pre-set roller distance can not be fallen below while exceeding the desired Roller distance is prevented by the contact pressure, and only at Running through the cold strand and possible in the event of casting problems.
- the part of a continuous casting installation (1) shown in FIG. 1 consists of an oscillating mold (2) from which the casting strand (7) with a thickness ( ) exit.
- the vertical strand guide (3) with devices for supporting and cooling and, if necessary, for squeezing the strand (7) to the thickness (d2) -
- the initially liquid casting strand (7) solidifies on its way downward by forced cooling in the area of the vertical strand guide (3) from the outside in, the liquid core (6) getting smaller and smaller Solidification point (17) solidifies the strand in its entire cross section is. Because of the
- the solidification point (17) of the strand temperature which is still very high, is the strand (7) but still very soft, so that controlled rolling in this strand area of the strand with the driver roller pairs (4, 5) according to the invention can be applied.
- driver roller pairs (4, 5) are arranged one below the other in the exemplary embodiment in FIG. 1 directly below the solidification point (17). These two pairs of driver rollers (4, 5) not only support the strand (7) and convey it further downwards, but also roll it in a controlled manner. The rolling takes place starting from the starting strand thickness (d2), first through the driver roller pair (4) with the contact pressure (p 1 ) to the strand thickness (d3) and then through the next driver roller pair (5) with the contact pressure (P2) to the strand thickness ( d4), which should correspond to the desired target strand thickness (d target).
- the strand thickness reduction achieved in this controlled rolling should be at least 2%, based on the starting strand thickness (d2) - in order to meet the two requirements for a minimum strand thickness reduction and keeping the strand thickness constant (d4) to the desired strand thickness (d soll ), the strand thicknesses will be (d3) and (d4) "online” continuously measured during the entire casting process and adjusted accordingly in the event of deviations. This is done as follows:
- one driver roller of the driver roller pairs (4, 5) is pressed against the strand (7) with a piston rod (21, 22) of a piston-cylinder unit (11, 12) with the pressure (P1, P2), while the respective opposite driver roller is attached to one Construction part (18) supports.
- the position of the piston rods (21, 22), which represent a measure of the distance between the two drive rollers from each other for a pair of drive rollers (4, 5), is determined by a suitable one Measured value detectors (19, 20) - for example an inductive displacement sensor - are represented as an electrical signal (d3 ', d4') and this signal (d3 ', d4') is continuously fed into a measuring and control device (10).
- FIG 2 a further embodiment of the invention is shown, wherein the driver roller pairs (4, 5) of the continuous casting system (1 ') are also pressed in this example by a piston-cylinder unit (13, 14) against the solidified strand (7), but with the difference is that the contact pressure (P3) also acts against movable stops (15) via projections (16) arranged on the piston rods (23, 24) of the piston-cylinder units (13, 14).
- the drive roller gap widths (d3, d4) specified by the stops can therefore no longer be fallen short of, since this prevents the stops (15).
- Exceeding the predetermined driver roller gap widths (d3, d4) is prevented in a simple manner by selecting the pressure (P3) higher than is necessary for the conveyance of the strand.
- This increased pressure (P3) which is so high that the driving roller gap widths (d3, d4) remain unchanged in normal casting operation, does not lead to an uncontrolled rolling of the strand - as in known continuous casting plants - but it acts because it directed against a fixed stop (15), no further negative. Since, on the other hand, the pressure (P3) should not be excessively high, so that the driver rollers (4, 5) can move apart at any time, for example in the event of casting operation malfunctions, the pressure (P3) can also be adjusted variably via the pump (9). In order to be able to roll different strand thicknesses in the same continuous casting installation (1 ') in a controlled manner, the stops (15) are designed to be movable in order to be able to set any desired drive roller gap width in this way.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Metal Rolling (AREA)
- Forging (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Stranggießen von dünnen Metallbändern in einer Stranggießanlage mit einer oszillierenden wassergekühlten Kokille, einer darunter angeordneten senkrechten Strangführung mit Einrichtungen zum Stützen und Abkühlen des Stranges bis zu seiner Durcherstarrung, einem oder mehreren Treiberrollenpaaren, die zur Stützung und zur Föderung des Stranges gegen den Strang gepresst werden, einer Vorrichtung zum Biegen des Stranges und einer Vorrichtung zum Rückbiegen des Stranges.The invention relates to a method for the continuous casting of thin metal strips in a continuous caster with an oscillating water-cooled mold, one vertical strand guide arranged below with devices for support and cooling the strand until it solidifies, one or more Driver roller pairs, which are used to support and promote the strand against the Extruded, a device for bending the strand and one Device for bending back the strand.
Beim bekannten Stand der Technik für das Stranggießen von Metallbändern geringer Dicke ( bis etwa 80 mm ) wird die geringe Strangdicke durch die besondere Formgebung der Kokillenplatten und / oder durch das Quetschen des Stranges mit noch flüssigem Kern erreicht.Lower in the known prior art for the continuous casting of metal strips Thickness (up to about 80 mm) is the small strand thickness due to the special Shaping the mold plates and / or by squeezing the strand with still liquid core reached.
Verfahren und Vorrrichtungen zum Stranggießen von Metallbändern sind beispielsweise aus den Druckschriften EP 0 625 388 A und EP 0 776 708 A bekannt. Der Metallstrang wird durch mehrere hydraulisch anstellbare Rollen vor seiner Erstarrung verformt.Methods and devices for the continuous casting of metal strips are for example known from publications EP 0 625 388 A and EP 0 776 708 A. The metal strand is stabilized by several hydraulically adjustable rollers before it solidifies deformed.
Nach der EP 0 539 784 A wird der Strang unmittelbar hinter der Kokille in einem Bereich, in dem der Kern des Stranges noch flüssig ist, unter entsprechender Steuerung des Anpressdruckes definiert verformt.According to EP 0 539 784 A, the strand is in one immediately after the mold Area in which the core of the strand is still liquid, under corresponding Control of the contact pressure is defined and deformed.
Aus der EP 0 350 431 A ist ein Stranggießverfahren für die Erzeugung von Brammen mit einer gegenüber dem Gusszustand verringerten Dicke bekannt, bei dem die teilweise erstarrten Brammen in einem ersten Abschnitt durch Rollen gestützt werden. In einem nachfolgenden Abschnitt sind Rollen zu Segmenten zusammengefasst und werden einzeln oder als Segement zusammengefasst gegen die Bramme gedrückt und verformt diese. Dabei wird die Sumpfspitze im Bereich der Anstellsegmente gehalten. Eine Verformung auf ein bestimmtes Mass erfolgt anschließend in einem dritten Abschnitt.EP 0 350 431 A describes a continuous casting process for the production of slabs known with a reduced thickness compared to the cast state, in which the partially solidified slabs are supported in a first section by rollers become. In a subsequent section, roles are summarized into segments and are summarized individually or as a segment against the The slab is pressed and deformed. The bottom of the swamp is in the area of Holding segments held. It is then deformed to a certain dimension in a third section.
Durch die EP 0 603 598 A1 ist ein Verfahren zum Herstellen eines Stahlbandes durch Giessen eines Stranges und anschliessendem Walzen bekannt. Aus einer Kokille wird ein Stahlstrang mit einer Geschwindigkeit von 2 - 20 m / min in einer Dicke von 40 - 50 m abgezogen. Zwischen Quetschrollen wird der Stahlstrang auf unter 30 mm, insbesondere 10 - 25 mm, zusammengequetscht. In einem Walzgerüst wird der Stahlstrang auf das Endmaß von 2 - 25 mm heruntergewalzt mit einem Umformgrad von > 20 %, vornehmlich aber 30 %.EP 0 603 598 A1 describes a method for producing a steel strip known by casting a strand and then rolling. From one Chill becomes a steel strand at a speed of 2 - 20 m / min in one Subtracted thickness of 40 - 50 m. The steel strand is opened between squeeze rollers less than 30 mm, especially 10 - 25 mm, squeezed together. In a roll stand the steel strand is rolled down to the final dimension of 2 - 25 mm with a Degree of deformation of> 20%, but primarily 30%.
Eine Stranggießanlage, wie auch dem Firmenprospekt " CSP / Compact Strip
Production / Das neue Gieß - und Walzverfahren für die wirtschaftliche Bandherstellung
" Nr. W4 + 9 / 319 / Forma SMS Schloemann-Siemag Aktiengesellschaft /
4000 / 8 / 87, zu entnehmen ist, besteht typischerweise aus einer oszillierenden
Kokille, einer darunter angeordneten senkrechten Strangführung mit Wasserdüsen
zum Abkühlen des Stranges bis zu seiner Durcherstarrung und einem oder mehreren
angetriebenen Rollenpaaren zum Ausfördern des Stranges. Damit der Strang
aus der Gießanlage gefördert werden kann, werden die Treiberrollen mit einem
bestimmten Druck an den Strang gepresst, der ihr Durchrutschen mit Sicherheit
ausschließt. Ein besonderes Merkmal dieser Stranggießanlagen ist die Anordnung
der Treiberrollen zum Ausfördern des Stranges unterhalb des Durcherstarrugnspunktes,
wobei die Abwesenheit des flüssigen Kerns im Strang
gewährleistet, dass der Strang dem Treiberrollendruck nicht nachgibt und eine
ausreichend große Zugkraft auf den Strang erzeugt wird.
Stand der Technik ist es hierbei, die Treiberrollen mit hydraulischen Zylindern an
den Strang zu pressen, wobei der Druck während des Gießvorgangs
unveränderlich ist. Diese Lösung hat sich beim Vergießen von niedriggekohlten
und austenitischen nichtrostenden Stählen auch bewährt. Beim Vergießen von
Stählen dagegen, welche bei Temperaturen von 1100°C sehr weich sind, wie
beispielsweise Si-legierte Stähle, nichtrostende ferritische Stähle,
hochkohlenstoffhaltige Stähle, führt der für die Erzeugung der Ausförderkraft
notwendige Rollendruck allerdings zu einer Dickenreduzierung des Stranges.
Hinzu kommt, dass der erforderliche Anstelldruck der Treiberrollen in der Praxis
wesentlich höher eingestellt ist als eigentlich ausreichend wäre, um das Risiko
des Durchrutschens der Treiberrollen, gleichbedeutend dem Steckenbleiben des
Stranges, mit Sicherheit auszuschließen. Durch diesen erhöhten Druck wird der
Strang durch die Treiberrollen unkontrolliert regelrecht gewalzt mit
Dickenabnahmen von beispielsweise bis zu 8 mm bei 60 mm Strangdicke.A continuous caster, as can be seen in the company brochure "CSP / Compact Strip Production / The new casting and rolling process for economical strip production" No. W4 + 9/319 / Forma SMS Schloemann-Siemag Aktiengesellschaft / 4000/8/87. typically consists of an oscillating mold, a vertical strand guide arranged underneath with water nozzles for cooling the strand until it solidifies and one or more driven roller pairs for conveying the strand out. In order that the strand can be conveyed out of the casting plant, the driver rollers are pressed against the strand with a certain pressure, which prevents them from slipping. A special feature of these continuous casting machines is the arrangement of the driver rollers for conveying the strand below the solidification point, the absence of the liquid core in the strand ensuring that the strand does not give in to the driver roller pressure and a sufficiently large tensile force is generated on the strand.
The state of the art here is to press the drive rollers onto the strand with hydraulic cylinders, the pressure being unchangeable during the casting process. This solution has also proven itself when casting low-carbon and austenitic stainless steels. On the other hand, when casting steels that are very soft at temperatures of 1100 ° C, such as Si-alloyed steels, rustproof ferritic steels, high-carbon steels, the roll pressure required to generate the discharge force leads to a reduction in the thickness of the strand. In addition, the required contact pressure of the driver rollers is set much higher in practice than would actually be sufficient to exclude with certainty the risk of the driver rollers slipping, which means that the strand gets stuck. As a result of this increased pressure, the strand is rolled in an uncontrolled manner by the driver rollers, with thickness reductions of, for example, up to 8 mm at 60 mm strand thickness.
Da die Festigkeit des Stranges sich in Abhängigkeit von allen Gießparametern, welche die Strangtemperatur beeinflussen, wie Temperatur der Schmelze, Gießgeschwindigkeit, Intensität der Sekundärkühlung, ständig verändert, ist die Dickenreduzierung des Stranges bei einem unveränderlichen Treiberrollendruck eine veränderliche und nicht beeinflußbare Größe.Since the strength of the strand changes depending on all casting parameters, which influence the strand temperature, such as the temperature of the melt, Pouring speed, intensity of secondary cooling, constantly changing, is that Thickness reduction of the strand with an unchanging driver roll pressure a variable and cannot be influenced.
Zur Steuerung der Kräfte, die durch gegenüberliegende Führungswalzen einer Stranggießmaschine auf einen dazwischen Laufenden Strang ausgeübt werden, wird in der DE 27 47 000 A1 vorgeschlagen, diese Kräfte zu messen und bei Abweichungen von einem Normwert durch einfaches Verdrehen einer Mutter oder eines Bolzens die Abmessung des Walzenspaltes nachzustellen. Eine solche Nachstellung oder Korrektur kann rasch zwischen einzelnen Gießläufen vorgenommen werden. Während der Gießläufe bleibt aber der Nachteil des unkontrollierten Walzens. To control the forces generated by opposite guide rollers Continuous casting machine can be exerted on a strand running in between, is proposed in DE 27 47 000 A1 to measure these forces and at Deviations from a standard value by simply turning a nut or a bolt to adjust the dimension of the nip. A such readjustment or correction can occur quickly between individual runs be made. The disadvantage of the remains during the casting runs uncontrolled rolling.
Die sich aus der unkontrollierten und veränderlichen Verwalzung des Stranges durch Treiberrollen ergebenden Nachteile sind dabei:
- Aufreißen der Kanten des Stranges
- unregelmäßige Dickenabnahme des Stranges
- Schwierigkeiten bei der Synchronisierung der Motorantriebe der Stranggießanlage wegen der unbekannten Längenänderung des Stranges
- Schwierigkeiten, das vorgegebene Coilgewicht einzuhalten.
- Tear the edges of the strand
- irregular decrease in thickness of the strand
- Difficulties in synchronizing the motor drives of the continuous caster due to the unknown length change of the strand
- Difficulties in maintaining the specified coil weight.
Um das unerwünschte, unkontrollierte Verwalzen des Stranges durch die Treiberrollen zu vermeiden, darf somit der Rollendruck einen bestimmten Wert nicht überschreiten.The unwanted, uncontrolled rolling of the strand by the driver rollers to avoid, the roll pressure must not have a certain value exceed.
Die erforderliche Ausförderkraft kann dann durch Erhöhung der Anzahl der Rollenpaare, durch Vergrößerung der Rollendurchmesser und durch den Antrieb aller Rollen erreicht werden.The required discharge force can then be increased by increasing the number of roller pairs, by increasing the roll diameter and by driving everyone Roles can be achieved.
Die Nachteile aller dieser Maßnahmen sind erhöhte Investitionskosten für die Anlagentechnik und die sich aus dem erhöhten Wartungsaufwand ergebenden zusätzlichen Produktionskosten. Je geringer die Strangdicke ist, um so größer sind diese genannten Nachteile, weil das die Ausförderkraft unterstützende Stranggewicht wegen des geringeren Querschnitts und der zusätzlichen kürzeren Anlagenhöhe entsprechend geringer ausfällt.The disadvantages of all these measures are increased investment costs for the plant technology and the additional resulting from the increased maintenance Production costs. The smaller the strand thickness, the larger these disadvantages mentioned, because the strand weight supporting the discharge force because of the smaller cross-section and the additional shorter system height is correspondingly lower.
Es ist Aufgabe der Erfindung, ein Verfahren zum Stranggießen von dünnen Metallbändern zu entwickeln, mit der mit möglichst geringem anlagetechnischen Aufwand die Treiberrollen zur Strangförderung eine vorgegebene Dickenreduzierung des Stranges mit größtmöglicher Konstanz herbeiführen und auch während des gesamten Gießvorganges beibehalten. It is an object of the invention to provide a method for the continuous casting of thin metal strips to develop with the least possible technical investment the driver rollers for the strand conveying a predetermined thickness reduction of the strand with the greatest possible constancy and also during the maintain the entire casting process.
Die gestellte Aufgabe wird verfahrensmäßig mit den Maßnahmen des Kennzeichnungsteils
des Anspruchs 1 bei einem Verfahren zum Stranggießen von dünnen
Metallbändern in einer Stranggießanlage mit einer oszillierenden, wassergekühlten
Kokille und einer darunter angeordneten senkrechten Strangführung dadurch
gelöst, dass zur definierten Dickenreduzierung des Stranges von mindestens 2 %,
bezogen auf die Strangdicke zum Zeitpunkt der Durcherstarrung des Stranges,
und zur Konstanthaltung einer vorab eingestellten Sollstrangdicke wenigstens
zwei Treiberrollenpaare kontinuierlich während des gesamten Gießprozesses mit
einem Anpressdruck gegen den Strang unmittelbar nach seiner Durcherstarrung
gepreßt werden wobei durch eine mit einer hydraulischen Pumpe verbundenen
Mess- und Regelvorrichtung, in die als Stellgrößen die erzeugten aktuellen
Strangdicken kontinuierlich einfließen und mit der vorab eingestellten Sollstrangdicke
verglichen werden, der von der hydraulischen Pumpe über hydraulische
Kolbenzylindereinheiten erzeugte veränderliche Anpressdruck der mindestens
zwei Treiberrollenpaare kontinuierlich "online" geregelt wird.The task set is procedural with the measures of the labeling part
of
Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous embodiments of the invention are specified in the subclaims.
Beim Vergießen von dünnen Strängen aus weichen Stählen ist es unvermeidbar, dass in den Treiberrollenpaaren eine Verwalzung des durcherstarrten Stranges stattfindet, wenn auf eine größere Anzahl von angetriebenen Treiberrollenpaaren mit großem Durchmesser verzichtet und ein Steckenbleiben des Stranges mit Sicherheit ausgeschlossen werden soll. Deshalb wird nach dem Verfahren der Erfindung dieses Verwalzen kontrolliert durchgeführt mit einer Gesamtstrangdickenreduzierung, die mindestens 2 % beträgt. Die Dickenreduzierung ist mit mindestens 2 % dabei so groß, dass das Durchrutschen der angetriebenen Rollen ausgeschlossen ist und wobei sie so groß sein kann, dass die Vorteile einer erhöhten Strangdicke im Bereich der Kokille und der Sekundärkühlung zur Geltung gelangen. When casting thin strands of soft steel, it is inevitable that in the pairs of driver rollers there is a rolling of the solidified strand takes place when on a larger number of driven driver roller pairs with a large diameter and the strand will certainly get stuck should be excluded. Therefore, according to the method of the invention this rolling is carried out in a controlled manner with a total strand thickness reduction, which is at least 2%. The thickness reduction is at least 2% so large that the driven rollers cannot slip and it can be so large that the benefits of an increased Strand thickness in the area of the mold and the secondary cooling come into their own.
Diese kontrollierte Dickenreduzierung des Stranges mit gleichzeitiger Konstanthaltung einer vorab eingestellten Sollstrangdicke durch mindestens zwei Treiberrollenpaare wird gemäß der Erfindung dadurch erreicht, dass mindestens ein den Strang ausförderndes Treiberrollenpaar mit einem veränderbaren definierten Druck kontinuierlich gegen den Strang unmittelbar nach seiner Durcherstarrung gepreßt wird. Hierzu wird kontinuierlich der aktuelle Rollenabstand, der der Strangdicke entspricht, messtechnisch erfaßt und in einer Mess- und Regelvorrichtung mit der vorab eingestellten Sollstrangdicke verglichen. Aufgrund des Messdatenvergleichs wird über eine hydraulische Pumpe, die mit der Mess- und Regelvorrichtung verbunden ist, der Anpressdruck, mit dem das Treiberrollenpaar gegen den Strang gepreßt wird, "online" so geregelt, dass stets die vorgegebene Sollstrangdicke erhalten wird und erhalten bleibt.This controlled reduction in the thickness of the strand while keeping it constant a preset target strand thickness by at least two Driver roller pairs is achieved according to the invention in that at least a pair of driver rollers that convey the strand with a changeable defined one Continuous pressure against the strand immediately after it has solidified is pressed. For this, the current roller spacing, the corresponds to the strand thickness, recorded by measurement and in a measuring and control device with the preset target strand thickness compared. Based on the measurement data comparison, a hydraulic Pump, which is connected to the measuring and control device, the Contact pressure, with which the driver roller pair is pressed against the strand, "Online" regulated so that the specified target strand thickness is always obtained and is preserved.
In einer alternativen Ausbildung der Erfindung werden die den Strang ausfördernden Treiberrollenpaare mit einem veränderbaren Anpressdruck gegen ortsveränderliche Anschläge gepreßt. Je nach der gewünschten Sollstrangdicke werden dabei die ortsveränderlichen Anschläge in entsprechende Positionen gebracht, so dass sich ein konstanter Rollenabstand entsprechend der Sollstrangdicke ergibt. Der gegen die Anschläge wirkende Druck ist dabei mindestens so groß, dass der Rollenabstand im normalen Gießbetrieb unverändert bleibt und dabei gewährleistet ist, dass beim Durchlaufen des Kaltstrangs oder bei Gießstörungen die Rollenpaare sich öffnen können.In an alternative embodiment of the invention, the strand conveying driver roller pairs with a changeable contact pressure against portable stops pressed. Depending on the desired strand thickness the portable stops are placed in corresponding positions brought so that there is a constant roller distance corresponding to the Target strand thickness results. The pressure against the stops is there at least so large that the roller spacing in normal casting operation remains unchanged and it is guaranteed that when going through the Cold strand or in the event of casting malfunctions, the pairs of rollers can open.
Da sich während des Gießbetriebes der Walzwiderstand beim Walzen auf die geforderte Mindestdickenabnahme von 2 % verändern kann, ist es erforderlich, den auf die Anschläge wirkenden Anpreßdruck entsprechend der vorgegebenen Dickenreduzierung variabel auszuüben, um ein öffnen der Rollenpaare bei Störungen zu ermöglichen.Since during the casting operation the rolling resistance when rolling on the required minimum thickness reduction of 2%, it is necessary the contact pressure acting on the stops in accordance with the specified Thickness reduction can be applied variably to open the roller pairs Allow interference.
Die aufgezeigten alternativen Möglichkeiten sind entsprechend der Erfindung nicht jeweils nur einzeln anwendbar, sondern können auch miteinander kombiniert werden. So ist es beispielsweise möglich, eine Stranggießanlage mit mindestens zwei Treiberrollenpaaren auszubilden, wobei die Spaltweite des einen Treiberrollenpaares mit einem veränderlichen Druck "online" geregelt wird, während die Spaltweite des anderen Treiberrollenpaares durch den Anpressdruck, der gegen einen Anschlag wirkt, unverändert bleibt. Auch bei Kombination dieser beiden Alternativen beträgt die Gesamtdickenabnahme erfindungsgemäß mindestens 2 %. The alternative possibilities shown are in accordance with the invention not only applicable individually, but can also be used together be combined. For example, it is possible to use a continuous caster form at least two pairs of driver rollers, the gap width of the regulating a pair of driver rollers with a variable pressure "online", while the gap width of the other pair of driver rollers by the Contact pressure that acts against a stop remains unchanged. Also at Combining these two alternatives will result in the total thickness decrease according to the invention at least 2%.
Durch die gezielte Dickenreduzierung, d. h. bei einem kontrollierten Walzen des Stranges bereits durch die Treiberrollen, ergibt sich ein neues Konzept der Dünnbrammentechnologie, wobei im Gegensatz zu bekannten Verfahren (CPR, LCR, ISP) das Walzen des Stranges bereits unmittelbar nach seiner Durcherstarrung mit den Treiberrollen erfolgt. Dies wird dabei ohne besonderen technologischen Aufwand erreicht und verringert im Gegensatz zu den oben angeführten bekannten Verfahren nicht die Gießleistung.Through the targeted reduction in thickness, d. H. in a controlled rolling of the Stranges through the driver roles, a new concept emerges Thin slab technology, whereas in contrast to known processes (CPR, LCR, ISP) already rolling the strand immediately after it Solidification with the driver rollers takes place. This will be without any special technological effort is achieved and reduced in contrast to the above known methods cited not the casting performance.
Das Walzen des durcherstarrten Stranges, egal aus welchem Stahl, erlaubt es
außerdem, ohne Verringerung der Gießleistung die Strangdicke im Bereich der
Kokille zu erhöhen, woraus sich bekannte Verbesserungen der Stahlqualität
ergeben. Durch das kontrollierte Walzen mittels der Treiberrollen ist es
außerdem möglich, dünne Stränge zu erzeugen, die sich ohne Beeinträchtigung
der Qualität aufwickeln Lassen, woraus sich neue vorteilhafte Anlagenkonzepte
ergeben.
Eine Stranggießanlage gemäß der Erfindung besteht aus einer unterhalb einer
oszillierenden Kokille senkrecht angeordneten Strangführung mit Einrichtungen
zum Stützen und Abkühlen und gegebenenfalls zum Quetschen des Stranges bis
zu seiner Durcherstarrung, mindestens einem Treiberrollenpaar, das zur
Stützung und zur Förderung des Stranges gegen den Strang gepreßt wird, einer
Vorrichtung zum Biegen des Stranges und eine Vorrichtung zum Rückbiegen
des Stranges. Mindestens ein Treiberrollenpaar ist dabei unmittelbar unterhalb
des Durcherstarrungspunktes des Stranges mit Mitteln zur Erzeugung eines
veränderlichen Anpressdruckes verbunden. Diese Mittel, die von einer
hydraulischen Pumpe gespeiste Kolbenzylindereinheiten sein können, sind mit
einer Mess- und Regelvorrichtung verbunden. Die Mess- und Regelvorrichtung
mißt kontinuierlich über einen Messfühler, beispielsweise einen induktiven
Wegaufnehmer, die aktuelle Strangdicke zwischen dem Treiberrollenpaar,
vergleicht diesen Meßwert mit einem vorab eingestellten Sollwert und regelt
"online" bei Abweichungen von diesem Sollwert den von der entsprechenden
Kolbenzylindereinheit aufzubringenden Anpressdruck. Rolling the solidified strand, regardless of which steel, also allows the strand thickness in the area of the mold to be increased without reducing the casting performance, which results in known improvements in steel quality. Controlled rolling using the driver rollers also makes it possible to produce thin strands that can be wound up without impairing the quality, which results in new advantageous system concepts.
A continuous caster according to the invention consists of a strand guide arranged vertically below an oscillating mold with devices for supporting and cooling and, if necessary, for squeezing the strand until it solidifies, at least one pair of driver rollers which are pressed against the strand for supporting and conveying the strand, a device for bending the strand and a device for bending back the strand. At least one pair of driver rollers is connected directly below the solidification point of the strand with means for generating a variable contact pressure. These means, which can be piston-cylinder units fed by a hydraulic pump, are connected to a measuring and regulating device. The measuring and control device continuously measures the current strand thickness between the pair of driver rollers via a measuring sensor, for example an inductive displacement sensor, compares this measured value with a previously set target value and regulates "online" the deviations from this target value of the contact pressure to be applied by the corresponding piston-cylinder unit.
Bei einer nach der Erfindung alternativ ausgebildeten Stranggießanlage sind bei mindestens einem Treiberrollenpaar ortsveränderliche Anschläge angeordnet, gegen die die Anpressmittel, beispielsweise Kolbenzylindereinheiten, mit veränderbarem Anpressdruck angepresst werden. Die ortsveränderlichen Anschläge sind dabei so ausgebildet, dass ein vorab eingestellter Rollenabstand nicht unterschritten werden kann, während ein überschreiten des gewünschten Rollenabstandes durch den Anpressdruck verhindert wird, und nur beim Durchlaufen des Kaltstranges und bei Gießstörungen möglich ist.In an alternatively designed continuous casting system according to the invention are at arranged at least one pair of driver rollers, portable stops, against which the pressing means, for example piston cylinder units, with changeable contact pressure. The portable Stops are designed so that a pre-set roller distance can not be fallen below while exceeding the desired Roller distance is prevented by the contact pressure, and only at Running through the cold strand and possible in the event of casting problems.
Weitere Einzelheiten, Merkmale und Vorteile der Erfindung werden nachfolgend anhand von zwei in schematischen Zeichnungsfiguren dargestellten Ausführungsbeispielen näher erläutert.Further details, features and advantages of the invention are set out below based on two shown in schematic drawing figures Embodiments explained in more detail.
Es zeigen:
- Fig. 1
- ein Fließschema eines Teils einer Stranggießanlage mit "online"-Regelung des Treiberrollenanpressdrucks,
- Fig. 2
- ein Fließschema eines Teils einer Stranggießanlage mit zwei fest angestellten Treiberrollenpaaren.
- Fig. 1
- a flow diagram of a part of a continuous caster with "online" control of the driver roller contact pressure,
- Fig. 2
- a flow diagram of part of a continuous caster with two permanent driver roller pairs.
Der in Figur 1 dargestellte Teil einer Stranggießanlage (1) besteht aus einer
oszillierenden Kokille (2), aus der senkrecht nach unten der Gießstrang (7) mit
einer Dicke (
Der zunächst flüssige Gießstrang (7) erstarrt bekanntermaßen auf seinem Weg nach unten durch Zwangskühlung im Bereich der senkrechten Strangführung (3) von außen nach innen, wobei der flüssige Kern (6) immer kleiner wird und am Durcherstarrungspunkt (17) der Strang in seinem gesamten Querschnitt erstarrt ist. Aufgrund der am As is known, the initially liquid casting strand (7) solidifies on its way downward by forced cooling in the area of the vertical strand guide (3) from the outside in, the liquid core (6) getting smaller and smaller Solidification point (17) solidifies the strand in its entire cross section is. Because of the
Durcherstarrungspunkt (17) noch sehr hohen Strangtemperatur ist der Strang (7) aber noch sehr weich, so dass in diesem Strangbereich das kontrollierte Walzen des Strangs mit den Treiberrollenpaaren (4, 5) gemäß der Erfindung angewendet werden kann.The solidification point (17) of the strand temperature, which is still very high, is the strand (7) but still very soft, so that controlled rolling in this strand area of the strand with the driver roller pairs (4, 5) according to the invention can be applied.
Zu diesem Zweck sind beim Ausführungsbeispiel der Figur 1 unmittelbar unterhalb des Durcherstarrungspunktes (17) zwei Treiberrollenpaare (4, 5) untereinander angeordnet. Durch diese beiden Treiberrollenpaare (4, 5) wird der Strang (7) nicht nur abgestützt und weiter nach unten gefördert, sondern gleichzeitig dabei kontrolliert gewalzt. Das Walzen geschieht dabei von der Ausgangsstrangdicke (d2) ausgehend zunächst durch das Treiberrollenpaar (4) mit dem Anpressdruck (p1) auf die Strangdicke (d3) und dann durch das nächste Treiberrollenpaar (5) mit dem Anpressdruck (P2) auf die Strangdicke (d4), die der gewünschten Sollstrangdicke (dsoll) entsprechen soll. Die bei diesem kontrollierten Walzen erzielte Strangdickenabnahme soll dabei mindestens 2 % betragen, bezogen auf die Ausgangsstrangdicke (d2)- Um die beiden Forderungen nach einer Mindeststrangdickenabnahme und der Konstanthaltung der Strangdicke (d4) auf die Sollstrangdicke (dsoll) zu erfüllen, werden die Strangdicken (d3) und (d4) "online" während des gesamten Gießprozesses kontinuierlich gemessen und bei Abweichungen entsprechend nachgeregelt. Dies geschieht wie folgt:For this purpose, two driver roller pairs (4, 5) are arranged one below the other in the exemplary embodiment in FIG. 1 directly below the solidification point (17). These two pairs of driver rollers (4, 5) not only support the strand (7) and convey it further downwards, but also roll it in a controlled manner. The rolling takes place starting from the starting strand thickness (d2), first through the driver roller pair (4) with the contact pressure (p 1 ) to the strand thickness (d3) and then through the next driver roller pair (5) with the contact pressure (P2) to the strand thickness ( d4), which should correspond to the desired target strand thickness (d target). The strand thickness reduction achieved in this controlled rolling should be at least 2%, based on the starting strand thickness (d2) - in order to meet the two requirements for a minimum strand thickness reduction and keeping the strand thickness constant (d4) to the desired strand thickness (d soll ), the strand thicknesses will be (d3) and (d4) "online" continuously measured during the entire casting process and adjusted accordingly in the event of deviations. This is done as follows:
Jeweils eine Treiberrolle der Treiberrollenpaare (4, 5) wird mit einer
Kolbenstange (21, 22) einer Kolbenzylindereinheit (11, 12) mit dem Druck (P1,
P2) gegen den Strang (7) gepreßt, während die jeweils gegenüberliegende
Treiberrolle sich an einem Konstruktionsteil (18) abstützt. Die Position der
Kolbenstangen (21, 22), die ein Maß für den Abstand der beiden Treiberrollen
voneinander für jeweils ein Treiberrollenpaar (4, 5) darstellen, wird durch einen
geeigneten
Messwerterfasser (19, 20) - beispielsweise einem induktiven Wegaufnehmer -
als ein elektrisches Signal (d3', d4') dargestellt und dieses Signal (d3', d4') in
eine Mess- und Regelvorrichtung (10) kontinuierlich eingespeist. In diese Messund
Regelvorrichtung (10) werden sämtliche Messdaten der am kontrollierten
Walzen beteiligten Treiberrollenpaare (4, 5) eingegeben und die
Gesamtdickenreduzierung des Stranges (7) mit der vorgegebenen
Sollstrangdicke (dsoll) verglichen. Als Ergebnis dieses Vergleichs regelt die
Mess- und Regelvorrichtung (10) über entsprechende Steuersignale, die in die
hydraulische Pumpe (9) einfließen, den erforderlichen, möglicherweise
unterschiedlichen Anpressdruck (P1, P2), für die Kolbenzylindereinheiten (11/12)
der Treiberrollenpaare (4, 5). Somit wird jede geringe Veränderung der
Treiberrollenspaltweite Über die Kolbenzylindereinheiten (11, 12) und deren
Messwerterfasser (19, 20) sofort von der Mess- und Regelvorrichtung (10) erfaßt
und von dieser kontinuierlich in eine entsprechende Änderung des
Anpressdrucks (P1, P2) für die in Frage kommenden Treiberrollenpaare (4, 5)
umgesetzt.In each case one driver roller of the driver roller pairs (4, 5) is pressed against the strand (7) with a piston rod (21, 22) of a piston-cylinder unit (11, 12) with the pressure (P1, P2), while the respective opposite driver roller is attached to one Construction part (18) supports. The position of the piston rods (21, 22), which represent a measure of the distance between the two drive rollers from each other for a pair of drive rollers (4, 5), is determined by a suitable one
Measured value detectors (19, 20) - for example an inductive displacement sensor - are represented as an electrical signal (d3 ', d4') and this signal (d3 ', d4') is continuously fed into a measuring and control device (10). All measurement data of the driver roller pairs (4, 5) involved in the controlled rolling are input into this measuring and control device (10) and the total thickness reduction of the strand (7) is compared with the predetermined target strand thickness (d soll ). As a result of this comparison, the measuring and control device (10) regulates the necessary, possibly different contact pressure (P1, P2) for the piston-cylinder units (11/12) of the driver roller pairs (corresponding control signals flowing into the hydraulic pump (9). 4, 5). Thus, every slight change in the driver roller gap width is immediately detected by the measuring and control device (10) via the piston-cylinder units (11, 12) and their measured value detectors (19, 20) and continuously changed by this into a corresponding change in the contact pressure (P1, P2) for implemented the driver roller pairs in question (4, 5).
In Figur 2 ist ein weiteres Ausführungsbeispiel der Erfindung dargestellt, wobei
die Treiberrollenpaare (4, 5) der Stranggießanlage (1') in diesem Beispiel
gleichfalls von einer Kolbenzylindereinheit (13, 14) gegen den durcherstarrten
Strang (7) gepreßt werden, allerdings mit dem Unterschied, dass der
Anpressdruck (P3) zusätzlich Über an den Kolbenstangen (23, 24) der
Kolbenzylindereinheiten (13, 14) angeordnete Ausladungen (16) gegen
ortsveränderliche Anschläge (15) wirkt. Die durch die Anschläge vorgegebenen
Treiberrollenspaltweiten (d3, d4) können somit nicht mehr unterschritten werden,
da dies die Anschläge (15) verhindern.
Ein überschreiten der vorgegebenen Treiberrollenspaltweiten (d3, d4), wird in
einfacher Weise dadurch verhindert, dass der Druck (P3) höher gewählt ist, als
für die Ausförderung des Stranges erforderlich ist. Dieser erhöhte Druck (P3),
der so hoch ist, dass im normalen Gießbetrieb die Treiberrollenspaltweiten (d3,
d4) unverändert bleiben, führt nun aber nicht - wie bei bekannten
Stranggießanlagen - zu einem unkontrollierten Walzen des Stranges, sondern er
wirkt sich, da er gegen einen festen Anschlag (15) gerichtet ist, nicht weiter
negativ aus. Da der Druck (P3) andererseits nicht übermäßig hoch sein soll,
damit jederzeit, beispielsweise bei Störungen des Gießbetriebes die
Treiberrollen (4, 5) auseinanderfahren können, ist der Druck (P3) gleichfalls
veränderbar über die Pumpe (9) einstellbar. Um unterschiedliche Strangdicken
in der gleichen Stranggießanlage (1') kontrolliert walzen zu können, sind die
Anschläge (15) ortsveränderlich ausgebildet, um auf diese Weise jede
gewünschte Treiberrollenspaltweite einstellen zu können.In Figure 2 a further embodiment of the invention is shown, wherein the driver roller pairs (4, 5) of the continuous casting system (1 ') are also pressed in this example by a piston-cylinder unit (13, 14) against the solidified strand (7), but with the The difference is that the contact pressure (P3) also acts against movable stops (15) via projections (16) arranged on the piston rods (23, 24) of the piston-cylinder units (13, 14). The drive roller gap widths (d3, d4) specified by the stops can therefore no longer be fallen short of, since this prevents the stops (15).
Exceeding the predetermined driver roller gap widths (d3, d4) is prevented in a simple manner by selecting the pressure (P3) higher than is necessary for the conveyance of the strand. This increased pressure (P3), which is so high that the driving roller gap widths (d3, d4) remain unchanged in normal casting operation, does not lead to an uncontrolled rolling of the strand - as in known continuous casting plants - but it acts because it directed against a fixed stop (15), no further negative. Since, on the other hand, the pressure (P3) should not be excessively high, so that the driver rollers (4, 5) can move apart at any time, for example in the event of casting operation malfunctions, the pressure (P3) can also be adjusted variably via the pump (9). In order to be able to roll different strand thicknesses in the same continuous casting installation (1 ') in a controlled manner, the stops (15) are designed to be movable in order to be able to set any desired drive roller gap width in this way.
Die Erfindung ist nicht auf die in den Zeichnungsfiguren dargestellten Ausführungsbeispiele beschränkt. So sind auch mehr als nur zwei Treiberrollenpaare zur Durchführung des erfindungsgemäßen Walzens unmittelbar nach der Druckerstarrung des Stranges anwendbar, wobei auch Kombinationen der beiden genannten Möglichkeiten
- der "online"-Regelung der Treiberrollenspaltweite und
- der Fixierung der Treiberrollenspaltweite durch Anpressdruckbegrenzung mittels Anschlägen
- the "online" regulation of the driver roller gap and
- the fixing of the driver roller gap by limiting the contact pressure by means of stops
Claims (3)
- A method for continuously casting thin metal strips in a continuous casting machine (1, 1') with an oscillating water-cooled mould (2), a vertical billet guide (3) that is arranged underneath said mould and contains devices for supporting, cooling and, if applicable, squeezing the billet up to its thorough solidification, one or more pairs of driving rolls (4, 5) that are pressed against the billet (7) in order to support and transport the billet (7), a device for bending the billet (7) and a device for reverse-bending the billet (7),
characterized in that
at least two pairs of driving rolls (4, 5) for withdrawing the billet (7) are continuously pressed against the billet (7) during the entire casting process with a contact pressure (P1, P2), namely immediately after its thorough solidification, in order to achieve a defined reduction in thickness of the billet (7) of at least 2% referred to the billet thickness (d2) at the time of the thorough solidification (17) and to maintain a preset nominal billet thickness (dnominal) constant, wherein a measuring and regulating device (10) that is connected to a hydraulic pump (9) continuously receives correcting variables in the form of the actual billet thicknesses (d3, d4) being produced and carries out a comparison with the preset nominal billet thickness (dnominal), and wherein said measuring and regulating device continuously regulates "on-line" the variable contact pressure (P1, P2) of the at least two pairs of driving rolls (4, 5) that is generated by the hydraulic pump (9) with the aid of hydraulic piston-cylinder units (11, 12). - The method according to Claim 1,
characterized in that
at least one pair of driving rolls (4, 5) is screwed down with a variable pressure by means of mechanical or hydraulic means to such a degree that the gap width of the driving rolls (d3, d4) is maintained constant and the total reduction in the billet thickness amounts to at least 2%. - The method according to Claim 1 or 2,
characterized in that
at least one pair of driving rolls (4, 5) is pressed against the billet (7) with a variable contact pressure (P1, P2) while the gap width of the other driving roll pairs is maintained constant, wherein the total reduction in the billet thickness during the pass through all roll pairs (4, 5) amounts to at least 2%.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19817034 | 1998-04-17 | ||
| DE19817034A DE19817034A1 (en) | 1998-04-17 | 1998-04-17 | Continuous casting of thin metal slabs |
| PCT/EP1999/002487 WO1999054072A1 (en) | 1998-04-17 | 1999-04-14 | Method and device for continuously casting thin metal strips |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1071529A1 EP1071529A1 (en) | 2001-01-31 |
| EP1071529B1 true EP1071529B1 (en) | 2004-09-29 |
Family
ID=7864824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99920656A Expired - Lifetime EP1071529B1 (en) | 1998-04-17 | 1999-04-14 | Method for continuously casting thin metal strips |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6491088B1 (en) |
| EP (1) | EP1071529B1 (en) |
| JP (1) | JP2002512128A (en) |
| CN (1) | CN1304343A (en) |
| AT (1) | ATE277705T1 (en) |
| DE (2) | DE19817034A1 (en) |
| WO (1) | WO1999054072A1 (en) |
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| WO2007068338A1 (en) | 2005-12-14 | 2007-06-21 | Sms Demag Ag | Method for the continuous casting of thin metal strip and continuous casting installation |
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| BR112018015432A2 (en) * | 2016-02-02 | 2018-12-18 | Nippon Steel & Sumitomo Metal Corporation | A cast piece curvature detecting device and a curvature detecting method of a cast piece |
| IT201800006563A1 (en) * | 2018-06-21 | 2019-12-21 | PLANT AND PROCEDURE FOR THE PRODUCTION OF A HOT ROLLED METAL TAPE | |
| CN113942777B (en) * | 2021-10-15 | 2023-05-30 | 联亚智能科技（苏州）有限公司 | Conveying device and fixed-length conveying system for flexible sound-absorbing and noise-reducing materials |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4056140A (en) * | 1976-10-20 | 1977-11-01 | United States Steel Corporation | Method and mechanism for controlling forces in a continuous-casting machine |
| DE3822939C1 (en) * | 1988-07-04 | 1989-10-05 | Mannesmann Ag, 4000 Duesseldorf, De | Continuous casting method for the production of slabs with a reduced thickness relative to the cast condition |
| DE3907905C2 (en) | 1988-07-04 | 1999-01-21 | Mannesmann Ag | Continuous casting process |
| IT1252847B (en) | 1991-10-31 | 1995-06-28 | Danieli Off Mecc | CONTROLLED PRE-LAMINATION GROUP FOR THIN SLABS OUT OF CONTINUOUS CASTING |
| IT1262116B (en) | 1993-05-17 | 1996-06-19 | Danieli Off Mecc | CONTROLLED PRELAMINATION PROCEDURE FOR THIN SLABS OUT OF CONTINUOUS CASTING AND RELATED DEVICE |
| DE4243857C1 (en) * | 1992-12-23 | 1994-07-28 | Thyssen Stahl Ag | Process for producing a steel strip by casting a strand and then rolling it |
| ES2128816T3 (en) * | 1995-11-28 | 1999-05-16 | Danieli Off Mecc | METHOD FOR PREVIOUS PASSING BY ROLLERS OF THIN PLATES. |
-
1998
- 1998-04-17 DE DE19817034A patent/DE19817034A1/en not_active Ceased
-
1999
- 1999-04-14 US US09/673,534 patent/US6491088B1/en not_active Expired - Fee Related
- 1999-04-14 DE DE59910665T patent/DE59910665D1/en not_active Expired - Lifetime
- 1999-04-14 EP EP99920656A patent/EP1071529B1/en not_active Expired - Lifetime
- 1999-04-14 WO PCT/EP1999/002487 patent/WO1999054072A1/en active IP Right Grant
- 1999-04-14 JP JP2000544456A patent/JP2002512128A/en not_active Withdrawn
- 1999-04-14 CN CN99807082A patent/CN1304343A/en active Pending
- 1999-04-14 AT AT99920656T patent/ATE277705T1/en active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007068338A1 (en) | 2005-12-14 | 2007-06-21 | Sms Demag Ag | Method for the continuous casting of thin metal strip and continuous casting installation |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE277705T1 (en) | 2004-10-15 |
| CN1304343A (en) | 2001-07-18 |
| DE19817034A1 (en) | 1999-10-21 |
| US6491088B1 (en) | 2002-12-10 |
| EP1071529A1 (en) | 2001-01-31 |
| DE59910665D1 (en) | 2004-11-04 |
| WO1999054072A1 (en) | 1999-10-28 |
| JP2002512128A (en) | 2002-04-23 |
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