EP0083916A1 - 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
EP0083916A1
EP0083916A1 EP82890179A EP82890179A EP0083916A1 EP 0083916 A1 EP0083916 A1 EP 0083916A1 EP 82890179 A EP82890179 A EP 82890179A EP 82890179 A EP82890179 A EP 82890179A EP 0083916 A1 EP0083916 A1 EP 0083916A1
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EP
European Patent Office
Prior art keywords
cooling
strand
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.)
Granted
Application number
EP82890179A
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German (de)
English (en)
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EP0083916B1 (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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Publication of EP0083916B1 publication Critical patent/EP0083916B1/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 1n coming from the melt distributor arrives in 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 begins to solidify and solidify from its surface.
  • the solid strand shell that forms during this process increases in strength as it passes through the mold.
  • this shell is still relatively thin in the case of the usually cast metals and alloys; the stripped strand is therefore suitable for manipulation, e.g. for pulling out of the mold, mechanically not yet stable enough.
  • one or more aftercoolers are therefore usually arranged, in which or which strengthening of the strand shell increases the strength of the strand, 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 26 487 describes a method for monitoring the condition of the mold during the ongoing Gleß ceremoniess, which makes it possible to recognize undesirable changes in the mold geometry early and thus the strand damage previously described, such as. 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 dwell time of the cast steel in the mold, and if the actual value deviates too much from this target value, a harmful change in the mold geometry is determined. 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 26 390 describes a method for adjusting the adjustment speed 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.
  • a method for controlling the cooling capacity is also known only for the narrow side walls of plate molds in continuous casting, in which the narrow side walls are clamped between the broad side walls and before the start of casting, the mold cavity between the narrow side walls is provided with a casting cone which converges in the direction of the strand and is adapted to the steel quality and the strand width.
  • the pouring cone is additionally set to a desired value corresponding to the intended pouring speed and / or pouring temperature, and if the pouring speed and / or the pouring temperature deviate during pouring operation, the pouring cone is changed according to predetermined desired values corresponding to these changing pouring parameters.
  • 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-PS 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 in a central computer controlling the control devices for the cooling water supply.
  • DE-OS 19 32 884 A similar device is described in DE-OS 19 32 884, 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 aim of which is to create a device which enables a treatment of the strand which is tailored to the individual and, depending on the material quality, different behavior of the casting strand leaving the mold during its further cooling, without direct contact with the cooling medium.
  • the invention relates to a device for the horizontal continuous casting of metals and alloys, in particular steels, which has a melting tank, a connected, preferably equipped with cooling, shaping slide mold, at least one aftercooler and a possibly oscillating drive device for the strand has sensors connected to a storage and control device for detecting the amount of heat dissipated from the cooling medium, which is characterized in that at least one aftercooler is designed as a plate cooler with cooling medium through which the cooling medium flows, and which, preferably on each cooling element Arranged, sensors for determining the amount of heat dissipated from the cooling medium are connected to the storage and control device, which in turn, preferably with each of the cooling elements arranged, by means of the control device adjustable to predetermined setpoints, adjusting devices for adjusting the position and thus the contact pressure of the cooling elements or their cooling surfaces on the respective surfaces of the strand and / or for adjusting the flow rate of the cooling medium through the cooling elements.
  • 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 the 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 if there are any dimensional deviations of the strand, for example "with slight warping or with deflection after leaving the mold, one over the circumference uniform cooling and thus the formation of a uniform and one in the longitudinal to ensure the strand shell increases in thickness evenly.
  • the control of the contact pressures of the individual cooling surfaces or cooling elements of the aftercoolers in order to achieve uniform heat dissipation over the strand circumference can be carried out as follows: Temperature measuring sensors, e.g. in the supply and discharge of the cooling elements for the cooling medium, Thermocouples, wherein a flow measuring sensor is also preferably arranged in the inlet or outlet 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 from the individual cooling elements, for example in kWh per unit of time, determined and compared with the data for the target cooling output of the individual cooling elements of the aftercooling device for each metal to be cast or for each alloy.
  • 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.
  • An embodiment of the device is therefore preferred in which the amounts of heat dissipated from the cooling medium by each cooling element are compared with respectively, preferably separately, set values, and if the actual values deviate from the specified values, the contact pressures of the individual cooling elements the respective wing surfaces by moving these elements using the use each of the aftercoolers to regulate and homogenize the cooling capacity of the individual cooling elements.
  • 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.
  • This measure has the following advantage: With each strand, the contact pressure on the wall of the cooling element on its underside is higher than the pressure on the side surfaces or on the top side due to its own weight. As a result, the heat center and thus the liquid core of the strand is shifted from its center towards the top of the strand, so the strand shell has a lower thickness on the top of the strand than on its underside. As a result of the increase in the contact pressure of the cooling elements acting on the upper side of the strand, which is adjustable according to the invention, a relatively greater heat dissipation is brought about there. The heat center can thus be shifted towards the underside of the strand into the geometric center of the strand, which enables the desired thickness of the strand shell to be achieved, which is uniform over the entire circumference.
  • 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 manufactured by Adjusting devices and / or the flow velocities of the cooling medium can be changed by the individual cooling elements until the target values are reached.
  • 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 of the cooling elements 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 actuating 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 actuating devices are connected to flow control elements, such as valves, slides or the like, arranged in the inlets or outlets of the cooling elements. It can also be provided that the contact pressure and cooling medium speed are combined the adjusting devices are usually tapered to match the taper of the casting strand subject to cooling, the strand axis approximating in the strand advancement direction. However, in the case of a conicity of the strand which varies as a result of the shrinkage properties of the cast metal changing within certain temperature intervals during the cooling, they are also designed to be adaptable to this changed, new conicity. To take into account the taper, it is advantageous to design the cooling surfaces of the cooling elements, which come into sliding contact with the surface of the strand, to narrow in the direction of strand movement.
  • 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 division of the aftercooling device into several aftercoolers allows, as already mentioned above, a pre-. 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 individual lateral surfaces of a square prismatic strand to be cooled in their 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 II-II 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. 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
  • the continuous casting mold 4 with the shaping surface 4a made of thermally conductive metal is connected to the melting container or melt distributor 1 made of refractory material and containing the melt 2 of the metal to be cast.
  • 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.
  • the shell 3a of the strand 3 surrounding the liquid core 3b is still thin and unstable within the mold 4 and, as the strand 5 passes through the cooler 5, where the strand surface comes into contact with the cooling surfaces 6, continuously gains strength 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 rigid cooling surfaces 6 of the cooler 5 are usually tapered in the direction of strand movement, so that along the cooling surface 6 the Contact with the strand surface, which is also conical as a result of the contraction, is retained as far as possible, and thus the effective cooling of the strand is continuously ensured over the entire length of the cooler 5.
  • the conicity of the rigid cooler once specified, cannot be changed and thus cannot be optimally adapted to the different shrinkage behavior of different metals or alloys with varying compositions. If the taper is large, the strand can get stuck in the cooler.
  • the strand 3 is pulled by a take-off device, not shown, e.g. from traction rollers, continuously or oscillatingly withdrawn from the mold and cooler, after which further desired manipulations, e.g. Cutting the strand, storage or the like.
  • a take-off device not shown, e.g. from traction rollers, continuously or oscillatingly withdrawn from the mold and cooler, after which further desired manipulations, e.g. Cutting the strand, storage or the like.
  • FIG. 3 shows schematically the device designed according to the invention, the individual parts being designated by the reference numerals used in FIGS. 1 and 2 and the system, as far as the casting process itself is concerned, working 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 necessary, 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 one over the strand Scope uniform cooling takes place 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 adjusting plates 11 which can be adjusted 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 strand axis, 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, which is, for example, where the cooling medium, usually water, leaves the aftercooling device , A sensor 15 for measuring the quantity 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 in each case gives appropriate instructions, for example in the form of pulses, to the actuating devices 12, for example to their servomotors, by means of which the position of the actuating plates 11 and there is then determined is changed with the cooling elements 5a, 5b, 5c until the data supplied by the sensors 13-15 and determined by the computer 16 match the stored, desired values of heat dissipation for each of the cooling elements mentioned.
  • FIGS. 4 and 5 correspond to the system shown schematically in FIG. 3. Corresponding parts are designated by the same reference numerals.
  • the after-cooling device is formed by two after-coolers.
  • the cooling elements 5a, 5b which are arranged around the circumference of the strand 3 for cooling its jacket surface and are in sliding contact with the strand on the cooling surfaces 6a, 6b, are arranged within a common jacket tube 7 surrounding them, which has openings 7a through which the Pressure springs 10 are guided, which press the individual cooling elements 5a, 5b against the surface or the individual surfaces of the strand 3.
  • the cooling medium is guided through the cooling elements 5a, 5b via the feed lines 8a, 8b and derivatives 9a, 9b, in which the sensors not shown in these figures, shown above, are located.
  • the devices for setting the contact pressure for each of the cooling elements for example, adjusting plate 11 and servomotor 12, which are indicated schematically on only one cooling element, are arranged outside the casing tube 7, so that they are not subject to any 3e influence by heating.
  • 6 to 10 show a continuous casting plant similar to the plant according to FIGS. 4 and 5, in which the after-cooling device 5 is divided into three coolers 5a, 5b, 5c.
  • FIGS. 6 to 9 correspond to those of the Flg. 4 and 5. It is shown there how, in the direction of the strand movement, the cooling elements or the cooling surfaces 6a-c in contact with the strand are increasingly reduced in their extent transversely to the direction of the strand movement and are designed to be moved 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 undesired "thickening" of the strand shell in the region of the strand edge, and thus to inhomogeneities, e.g. Cracks can be avoided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
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 true EP0083916A1 (fr) 1983-07-20
EP0083916B1 EP0083916B1 (fr) 1986-03-26

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

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0279106A3 (en) * 1986-09-29 1989-04-26 Steel Casting Engineering, Ltd. Moving plate continuous casting aftercooler
WO2000044515A1 (fr) * 1999-01-28 2000-08-03 Thöni Industriebetriebe Gmbh Dispositif pour la coulee en continu horizontale, en particulier la coulee de feuillards
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
CN118577755A (zh) * 2024-08-06 2024-09-03 河北恒工精密装备股份有限公司 一种结晶器冷却水温度调节方法及系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6316536U (fr) * 1986-07-14 1988-02-03
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2319323B2 (de) * 1972-04-18 1975-12-18 Concast Ag, Zuerich (Schweiz) Verfahren und Vorrichtung zum Beeinflussen des Wärmeentzuges in Kokillen beim Stranggießen
DE2440273B1 (de) * 1974-08-20 1976-02-19 Mannesmann Ag Verfahren zur regelung des stranggiessprozesses beim vergiessen von stahl, sowie anordnung zur durchfuehrung des verfahrens
DE2415224B2 (de) * 1973-03-30 1976-07-15 Concast AG, Zürich (Schweiz) Verfahren und vorrichtung zum steuern der kuehlleistung von schmalseitenwaenden bei plattenkokillen beim stranggiessen
EP0026487A1 (fr) * 1979-10-02 1981-04-08 Concast Holding Ag Procédé de coulée continue d'acier
EP0026390A1 (fr) * 1979-09-21 1981-04-08 Concast Holding Ag Procédé de mise au point de la vitesse d'ajustement des côtés étroits d'une plaque lingotière lors de la coulée continue d'acier

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2319323B2 (de) * 1972-04-18 1975-12-18 Concast Ag, Zuerich (Schweiz) Verfahren und Vorrichtung zum Beeinflussen des Wärmeentzuges in Kokillen beim Stranggießen
DE2415224B2 (de) * 1973-03-30 1976-07-15 Concast AG, Zürich (Schweiz) Verfahren und vorrichtung zum steuern der kuehlleistung von schmalseitenwaenden bei plattenkokillen beim stranggiessen
DE2440273B1 (de) * 1974-08-20 1976-02-19 Mannesmann Ag Verfahren zur regelung des stranggiessprozesses beim vergiessen von stahl, sowie anordnung zur durchfuehrung des verfahrens
EP0026390A1 (fr) * 1979-09-21 1981-04-08 Concast Holding Ag Procédé de mise au point de la vitesse d'ajustement des côtés étroits d'une plaque lingotière lors de la coulée continue d'acier
EP0026487A1 (fr) * 1979-10-02 1981-04-08 Concast Holding Ag Procédé de coulée continue d'acier

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0279106A3 (en) * 1986-09-29 1989-04-26 Steel Casting Engineering, Ltd. Moving plate continuous casting aftercooler
WO2000044515A1 (fr) * 1999-01-28 2000-08-03 Thöni Industriebetriebe Gmbh Dispositif pour la coulee en continu horizontale, en particulier la coulee de feuillards
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
CN118577755A (zh) * 2024-08-06 2024-09-03 河北恒工精密装备股份有限公司 一种结晶器冷却水温度调节方法及系统

Also Published As

Publication number Publication date
JPH0250822B2 (fr) 1990-11-05
ATA523581A (de) 1983-04-15
JPS58110165A (ja) 1983-06-30
EP0083916B1 (fr) 1986-03-26
AT372891B (de) 1983-11-25
DE3270172D1 (en) 1986-04-30

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