EP0083916B1 - Dispositif pour la coulée continue horizontale de métaux et d'alliages, notamment d'acier - Google Patents

Dispositif pour la coulée continue horizontale de métaux et d'alliages, notamment d'acier Download PDF

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Publication number
EP0083916B1
EP0083916B1 EP19820890179 EP82890179A EP0083916B1 EP 0083916 B1 EP0083916 B1 EP 0083916B1 EP 19820890179 EP19820890179 EP 19820890179 EP 82890179 A EP82890179 A EP 82890179A EP 0083916 B1 EP0083916 B1 EP 0083916B1
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EP
European Patent Office
Prior art keywords
strand
cooling
cooling elements
elements
control device
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
Application number
EP19820890179
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German (de)
English (en)
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EP0083916A1 (fr
Inventor
Manfred Dipl.-Ing. Haissig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vereinigte Edelstahlwerke AG
Original Assignee
Vereinigte Edelstahlwerke AG
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Publication of EP0083916A1 publication Critical patent/EP0083916A1/fr
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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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/045—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for horizontal casting

Definitions

  • the invention relates to a device for the horizontal continuous casting of metals and alloys, in particular steels.
  • the metal melt coming from the melt distributor passes into a horizontal continuous casting mold made of a thermally conductive metal, usually cooled with a cooling medium, where the metal strand that is being formed solidifies from its surface and begins to solidify.
  • the solid strand shell that forms during this process increases in strength as it passes through the mold.
  • this shell is still relatively thin after leaving the mold in the usually cast metals and alloys.
  • the stripped strand is therefore suitable for manipulation, such as. B. for pulling out of the mold, mechanically not yet stable enough.
  • one or more aftercoolers are therefore usually arranged, in which or which a strengthening of the strand shell which increases the strength of the strand is achieved, so that the strand, which is still molten in the center, is free of danger Fracture can be detected by the strand withdrawal device, for example by its drive rollers, and then manipulated further in the desired manner.
  • European patent application EP-A-0 026 487 describes a method for monitoring the condition of the mold during the ongoing casting operation, which makes it possible to identify undesirable changes in the mold geometry at an early stage and thus to prevent the strand damage described above, such as e.g. B. to prevent cracks or breakthroughs.
  • the respective actual value of the cooling capacity of the mold is determined, compared with a target value given as a function of the carbon content and the residence time of the cast steel in the mold, and if the actual value deviates too much from this target value, it becomes harmful Change in the mold geometry was found. The necessary measures to ensure the desired strand quality are then taken.
  • this known method makes it possible to recognize strand damage occurring in time as a result of an unfavorable mold geometry, a correction or readjustment of the mold geometry during operation is not provided for in this method.
  • European patent application EP-A-0026390 describes a method for adjusting the speed of adjustment of the narrow sides of a plate mold in steel continuous casting, in which the distance between the narrow sides is changed during the continuous casting operation to change the format.
  • this adjustment speed should be as high as possible, but this entails the risk that bulges and breakthroughs on the strand may occur.
  • the amount of heat removed from the cooling medium on the narrow sides of the mold during the adjustment is measured, and the narrow sides are only adjusted so quickly that the amount of heat removed does not fall below a respectively predetermined amount.
  • Adjustment of the position of the other two sides of the mold, apart from the narrow sides thereof, is not provided for in the latter two methods.
  • post-cooling devices for vertical and curved continuous casting plants have become known in which the strand is cooled by applying the cooling medium - usually water - directly to the strand.
  • Such a device is described, for example, in AT-B-303 987, wherein a control of the amount of cooling water applied to the strand by determining the surface temperature of the strand before it enters and after it exits the after-cooling zone by means of sensors and processing the determined Characteristic data takes place in a central computer controlling the control devices for the cooling water supply.
  • a similar device is described in DE-A-1932884, in which a control of various functions of an arc continuous casting installation is provided. There is also a regulation of the amount of cooling water delivered to the line by the after-cooling device, which also works according to the direct cooling principle.
  • the cooling capacity of the mold is also controlled by controlling the amount of cooling medium flowing through it by means of temperature and flow sensors which determine the amount of heat removed from the cooling medium.
  • the invention relates to a device for the horizontal continuous casting of metals and alloys, in particular steels, wherein a shaping slide mold, preferably equipped with cooling, and sensors connected to a storage and control device for detecting the amount of heat removed from the strand with a cooling medium, and a Actuating device for regulating the heat dissipation which can be actuated by the storage and control device are provided, which is characterized in that the horizontal sliding mold connected to a melt container and an optionally oscillating drive device for the strand has at least one aftercooler which acts as a plate cooler with the cooling medium flow-through position variable cooling elements is formed, on the cooling elements, preferably on each cooling element of the aftercooler Arranged sensors for determining the amount of heat dissipated from the cooling medium are connected to the storage and control device, which in turn are connected to the cooling elements, preferably to each of the cooling elements, by means of the control device, which can be set to predetermined setpoints by means of the control device, for adjusting the position and thus the contact pressure
  • the device according to the invention makes it possible in each case on the main surfaces and preferably also on different sections of the drawn-off strand in the longitudinal direction to set the amounts of heat given off by the strand to the aftercooling device individually to desired values and the cooling capacity of the individual cooling elements to one another and to requirements, properties and behavior of the potted material.
  • An individually controlled cooling of the strand both in terms of its entire circumference and its longitudinal profile, can be achieved, which manifests itself, for example, in a thickness of the strand shell that is uniform over the circumference of the strand and in the strand movement direction in a uniformly increasing thickness without discontinuities.
  • a strand of this type, having a uniform or evenly strengthening strand shell can be manipulated without danger on the one hand, and on the other hand, the finished strand obtained as a process product is characterized by high and reproducible homogeneity and quality.
  • the preferably provided individual control of the contact pressure of the individual cooling elements on the strand and / or the amount of coolant flowing through each cooling element allows, even in the event of possible dimensional deviations of the strand, for. B. with slight warping or deflection after leaving the mold, nevertheless ensure uniform cooling over the circumference and thus the formation of a uniform and a longitudinally increasing strand shell increasing in thickness.
  • the control of the contact pressures of the individual cooling surfaces or cooling elements of the aftercooler to achieve uniform heat dissipation over the circumference of the strand can be carried out in practice, for example, as follows: Temperature measuring sensors, for example in the inlet and outlet of the cooling elements for the cooling medium. B. thermocouples, and in addition preferably a flow measuring sensor is arranged in the inflow or outflow of each of the cooling elements. The measurement data obtained from these sensors of each of the cooling elements, i.e.
  • the data about the amount of cooling medium flowing through the cooling elements per unit of time and the temperature differences between the inflow and outflow of the respective elements are fed to the central storage and control device, which therefrom provides the amounts of heat dissipated by the individual cooling elements, e.g. B. in kWh per unit of time, and compares it with data for each target metal or alloy to be cast and stored for the target cooling output of the individual cooling elements of the aftercooling device. Using the deviation data obtained in the comparison, the contact pressures of the individual cooling elements on the strand and / or the amounts of the cooling medium flowing through these elements per unit of time are changed until the pre-stored values of the cooling capacity desired depending on the alloy to be cast are achieved.
  • a device according to the invention is preferred in which the storage and control device is formed by a computer or microprocessor equipped with data and program storage devices. These facilities can be easily integrated into a larger existing system of data processing and conversion systems.
  • the sequence of a separate cooling program can also be provided for each cooling element for each step, which controls the contact pressure or the flow rate of the cooling medium as a function of time in accordance with a predetermined characteristic.
  • the use of a microprocessor is also advantageous for such microsteps.
  • the adjusting devices for changing the position of the cooling elements or the flow control elements for the cooling medium are preferably equipped with a, preferably digitally controllable, step-by-step sliding current motor. This allows a particularly precise adjustment of the actuating device.
  • Other control devices for regulating the contact pressure of the cooling elements on the strand surface are equipped, for example, with hydraulic actuators, induction coils or the like.
  • the adjusting devices are provided with flow control elements, such as valves, arranged in the inlets or outlets of the cooling elements. Sliders or the like. Connected. It can also be provided to use the contact pressure and cooling medium speed in combination to regulate and homogenize the cooling capacity of the individual cooling elements of each of the aftercoolers. This has the advantage that if one of the two systems fails, the intact system can continue to operate without interruption.
  • the cooling elements of the post-cooling device arranged above the horizontal horizontal plane, based on the casting strand can be acted upon with a higher contact pressure and / or with a higher cooling medium flow rate than the cooling elements lying below this level.
  • thermal stresses within the strand shell can be avoided, which increases the quality of the products.
  • the individual cooling elements of the aftercooler device formed from one or more aftercooler (s) are usually set conically by the actuating devices to adapt to the taper of the casting strand subject to cooling, which approximates the strand axis in the strand advancement direction.
  • the actuating devices to adapt to the taper of the casting strand subject to cooling, which approximates the strand axis in the strand advancement direction.
  • they are also designed to be adaptable to this changed, new conicity.
  • the aftercooling device is preferably divided into two to four aftercoolers and each aftercooler advantageously has a number of cooling elements and cooling surfaces corresponding to the number of individual surfaces forming the strand jacket.
  • the subdivision of the aftercooler device into a number of aftercoolers allows, as already mentioned above, a precise adaptation of the position of the cooling elements to the strand which changes in dimension due to the respective shrinkage behavior.
  • cooling elements or their cooling surfaces in the direction of the strand withdrawal downstream are designed to abut only the central or near-center regions of the individual surfaces of the jacket of the strand , while they are not in contact with the strand edges and in the regions of the individual surfaces of the strand jacket close to the strand edges.
  • the entire circumference of the strand that is, for. B. to cool the individual lateral surfaces of a square prismatic strand, each in its full width by the cooling elements.
  • the strand continues to advance, but possibly also immediately after leaving the mold, there is advantageously only one area in and around the center of the individual surfaces of the strand jacket to be cooled, under control of the contact pressures of the and / or the cooling medium flow through the individual cooling elements cooled, while the edges or edge regions of the strand, which are already subject to increased self-cooling, are not subjected to forced cooling by the cooling elements of the after-cooling device.
  • FIG. 1 shows a longitudinal section through a conventional rigid continuous casting mold
  • FIG. 2 shows a section through the permanent mold shown in FIG. 1 along the plane 11-11 perpendicular to the axis
  • FIG. 3 shows the schematic sketch of a continuous casting installation designed according to the invention with its contact pressure adjustable after-coolers having position-changing cooling elements
  • FIG. 4 shows a longitudinal section through a device according to the invention with a after-cooling device having two after-coolers
  • FIG. 5 shows a section through the system shown in FIG. 4 along the vertical plane VV
  • FIG. 6 shows a longitudinal section through FIG. 7 shows a schematic plan view of the cooling surfaces after removal of the cooler jacket tube
  • FIG. 8 shows a section through the system shown in FIG. 6 along the vertical plane VIII-VIII
  • FIG. 9 one along the vertical plane IX-IX
  • FIG. 10 one those along the vertical plane X-X.
  • the melt container or melt distributor which is made of refractory material and contains the melt 2 of the metal to be cast, is connected 1 the continuous casting mold 4 with a shaping surface 4a made of thermally conductive metal.
  • the mold 4 is connected to the rigid cooler 5, whose cooling surface 6, which is also made of thermally conductive metal, comes into sliding contact with the solidified surface of the strand 3 moving through the cooler.
  • Both the rigid cooler 5 and the mold 4 are flowed through by the cooling medium, which flows from the inlet 8 along a path indicated by the broken line in the figure to the outlet 9 and extracts heat from the strand passing through the mold and cooler.
  • the melt 2 passes from the melting container into the cavity of the cooled mold 4 and begins to solidify from the outside, forming the strand 3.
  • the shell 3a of the strand 3 surrounding the liquid core 3b is still thin and unstable within the mold 4 and continuously gains strength as the strand 3 passes through the cooler 5, where the strand surface comes into contact with the cooling surfaces 6, in the direction of the strand advancement and strength.
  • the strand should have solidified to such an extent that it can be withdrawn or manipulated without risk of breakage or the like.
  • the strand shrinks on all sides, the strand 3 thus tapering increasingly in the direction of the strand advancement.
  • the strand 3 of a trigger device for. B. from driving rollers, continuously or oscillatingly withdrawn from the mold and cooler, after which further desired manipulations, such as. B. cutting the strand, storage od. Like. Take place.
  • FIG. 3 shows schematically the device designed according to the invention, the individual parts being denoted by the reference numerals used in FIGS. 1 and 2 and the system, as far as the casting process itself is concerned, operating analogously to the system shown in FIGS. 1 and 2 .
  • the cooling medium is guided through the individual cooling elements 5a-5c in cocurrent with the strand advancement after it has flowed through the mold 4. It should be emphasized that any other way of guiding the cooling medium through the cooling elements 5a-5c can also be provided and that, if appropriate, each cooling element can also have its own cooling medium circuit, which is particularly advantageous in systems equipped with individually controllable cooling elements, in which either in addition to controlling the contact pressure or exclusively controlling the cooling of the strand to achieve uniform cooling over the circumference of the strand by varying the amount of cooling medium flowing through the respective cooling elements per unit of time.
  • the cooling elements 5a-5c are connected via springs 10 to steep plates 11 which can be varied in their position - in particular in their distance from the cooler or strand axis - by means of adjusting device 12. Due to the force of the springs, the cooling elements 5a-5c or their cooling surfaces are movable against the surface of the passing strand 3 and also not parallel to the axis of the strand, but pressed parallel to or onto the respective strand surfaces and thereby effect their uniform cooling.
  • the actuating devices 12 are advantageously equipped with digitally controllable, step-by-step DC motors.
  • thermocouples are installed, furthermore, for example, where the cooling medium, usually water, leaves the aftercooling device , A sensor 15 for measuring the amount of cooling medium flowing through an adjacent series of cooling elements 5a-5c.
  • the parameters determined by the sensors 13, 14, 15 are fed to a computer 16, which processes them into data about the heat dissipation that has taken place and compares the data thus obtained with the parameters entered into the storage device 17 and corresponding to the metal to be cast.
  • the computer 16 gives respective instructions, for example B. in the form of pulses to the actuators 12, for example on their servomotors, by means of which the position of the actuating plates 11 and thus the cooling elements 5a, 5b, 5c is then changed until the sensor 13-15 and the Computer 16 determined data agree with the stored, desired values of heat dissipation for each of the cooling elements mentioned.
  • the cooling medium is guided through the cooling elements 5a, 5b via the supply lines 8a, 8b and discharge lines 9a, 9b, in which the sensors not shown in these figures are shown.
  • the devices for setting the contact pressure for each of the cooling elements for example, adjusting plate 11 and servomotor 12, which are schematically indicated only on one cooling element, are arranged outside the casing tube 7, so that they are not subject to any influence by heating.
  • 6 to 10 show a continuous casting plant similar to the plant according to FIGS. 4 and 5, in which the aftercooling device 5 is divided into three coolers 5a, 5b, 5c.
  • FIGS. 6 to 9 correspond to those of FIGS. 4 and 5. It is shown there how the cooling elements or the cooling surfaces 6a-c in contact with the strand are increasingly reduced in their extension transverse to the strand movement direction and are formed away from the strand edges.
  • edges of the strand 3 are removed from the forced cooling in this way, so that there is too intensive cooling, which leads to undesirable thickening of the strand shell in the region of the strand edge, and thus to inhomogeneities, eg. B. can cause cracks is avoided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Claims (6)

1. Appareil pour la coulée continue horizontale de métaux et alliages, en particulier d'aciers, comportant une lingotière glissante (4) de formage, de préférence équipée d'un refroidissement, des capteurs (13,14,15) reliés à un dispositif de mémorisation et de commande (16, 17) pour détecter la quantité de chaleur dissipée dans la barre (3) par un agent de refroidissement et un dispositif de réglage final (12) pouvant être actionné par le dispositif de mémorisation et de commande (16, 17) pour la régulation de la dissipation de chaleur, caractérisé par le fait que le dispositif présentant une lingotière glissante horizontale (4) faisant suite à un réservoir à bain (1) et un dispositif d'entraînement éventuellement oscillant pour la barre (3) présente au moins un refroidisseur secondaire (5) qui est conçu sous forme de refroidisseur à plaques muni d'éléments de refroidissement à position variable (5a, 5b, 5c) parcourus par l'agent de refroidissement, des capteurs (13, 14, 15) disposés sur les éléments de refroidissement, de préférence sur chaque élément de refroidissement du refroidisseur secondaire (5) pour déterminer la quantité de chaleur dissipée par l'agent de refroidissement étant reliés au dispositif de mémorisation et de commande (16, 17) qui, de son côté, est relié à des dispositifs de réglage final (12) adjoints aux éléments de refroidissement (5a, 5b, 5c), de préférence à chacun des éléments de refroidissement, réglables à des valeurs de consigne prescrites au moyen du dispositif de commande (16, 17), pour le réglage de la position et donc de la pression de poussée des éléments de refroidissement (5a, 5b, 5c) ou de leurs surfaces de refroidissement (6a, 6b, 6c) sur les surfaces correspondantes de la barre (3) et/ou pour le réglage de la vitesse d'écoulement de l'agent de refroidissement à travers les éléments de refroidissement.
2. Appareil selon la revendication 1, caractérisé par le fait que le dispositif de mémorisation et de commande (16, 17) est formé par un ordinateur ou microprocesseur équipé de dispositifs de mémorisation de données et de programme.
3. Appareil selon l'une des revendications 1 ou 2, caractérisé par le fait que les dispositifs de réglage final (12) sont équipés d'un moteur à courant continu, pouvant de préférence être commandé numériquement et fonctionnant pas à pas.
4. Appareil selon l'une des revendications 1 à 3, caractérisé par le fait que les éléments de refroidissement (5a, 5b, 5c) du dispositif de refroidissement secondaire, disposés au-dessus du plan horizontal axial par rapport à la barre de coulée, peuvent être soumis à une plus haute pression de poussée et/ou à une plus grande vitesse d'écoulement d'agent de refroidissement, que les éléments de refroidissement situés en dessous de ce plan.
5. Appareil selon l'une des revendications 1 à 4, caractérisé par le fait que les surfaces de refroidissement (6a, 6b, 6c) des éléments de refroidissement (5a, 5b, 5c) qui entrent en contact avec la surface de la barre (3) sont conçus sous forme rétrécie dans le sens de mouvement de la barre.
6. Appareil selon l'une des revendications 1 à 5, caractérisé par le fait que les éléments de refroidissement (5a, 5b, 5c) ou leurs surfaces de refroidissement (6a, 6b, 6c), diminuant vers l'aval dans le sens de retrait de la barre, de préférence dans leur extension transversalement à l'axe de la barre, sont conçus de manière à s'appliquer seulement aux régions de la paroi latérale de la barre (3) qui sont situées au centre ou près du centre, tandis qu'ils ne s'appliquent pas aux bords de la barre ni aux régions des surfaces individuelles de la paroi latérale de la barre qui sont proches des bords de la barre.
EP19820890179 1981-12-07 1982-12-03 Dispositif pour la coulée continue horizontale de métaux et d'alliages, notamment d'acier Expired EP0083916B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT523581A AT372891B (de) 1981-12-07 1981-12-07 Verfahren zum horizontal-stranggiessen von metallen und legierungen, insbesondere von staehlen
AT5235/81 1981-12-07

Publications (2)

Publication Number Publication Date
EP0083916A1 EP0083916A1 (fr) 1983-07-20
EP0083916B1 true EP0083916B1 (fr) 1986-03-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820890179 Expired EP0083916B1 (fr) 1981-12-07 1982-12-03 Dispositif pour la coulée continue horizontale de métaux et d'alliages, notamment d'acier

Country Status (4)

Country Link
EP (1) EP0083916B1 (fr)
JP (1) JPS58110165A (fr)
AT (1) AT372891B (fr)
DE (1) DE3270172D1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6316536U (fr) * 1986-07-14 1988-02-03
US4774996A (en) * 1986-09-29 1988-10-04 Steel Casting Engineering, Ltd. Moving plate continuous casting aftercooler
AT407845B (de) * 1999-01-28 2001-06-25 Thoeni Industriebetriebe Gmbh Vorrichtung zum horizontalen stranggiessen von bändern
CN113102708B (zh) * 2019-10-31 2022-08-23 杭州富通电线电缆有限公司 用于铜杆制造的连铸结晶器
CN114406214A (zh) * 2022-01-18 2022-04-29 江西理工大学 一种分段式水平连铸结晶器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2440273C2 (de) * 1974-08-20 1976-09-30 Mannesmann Ag Verfahren zur regelung des stranggiessprozesses beim vergiessen von stahl, sowie anordnung zur durchfuehrung des verfahrens
CH639885A5 (de) * 1979-09-21 1983-12-15 Concast Ag Verfahren zur einstellung der verstellgeschwindigkeit der schmalseite(n) einer plattenkokille.
CH643764A5 (de) * 1979-10-02 1984-06-29 Concast Ag Verfahren zur ueberwachung der kokillengeometrie beim stahlstranggiessen.

Also Published As

Publication number Publication date
ATA523581A (de) 1983-04-15
EP0083916A1 (fr) 1983-07-20
JPH0250822B2 (fr) 1990-11-05
JPS58110165A (ja) 1983-06-30
DE3270172D1 (en) 1986-04-30
AT372891B (de) 1983-11-25

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