EP2279053A1 - Verfahren zum stranggiessen eines metallstrangs - Google Patents
Verfahren zum stranggiessen eines metallstrangsInfo
- Publication number
- EP2279053A1 EP2279053A1 EP09749695A EP09749695A EP2279053A1 EP 2279053 A1 EP2279053 A1 EP 2279053A1 EP 09749695 A EP09749695 A EP 09749695A EP 09749695 A EP09749695 A EP 09749695A EP 2279053 A1 EP2279053 A1 EP 2279053A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strand
- continuous casting
- metal
- calculated
- equation
- 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
Links
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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
Definitions
- the invention relates to a method for continuously casting a metal strand, in particular a steel strand, in a continuous casting, wherein a strand with a trapped by a strand shell, liquid core drawn from a cooled continuous casting mold, supported in a continuous casting mold downstream strand support means and cooled with coolant , where thermodynamic state changes of the entire strand in a mathematical simulation model, taking into account the physical parameters of the metal, the thickness of the strand and the constantly measured extraction speed are also calculated.
- a method for the continuous casting of a metal strand in which a strand with drawn from a strand shell liquid core extracted from a cooled mold, then supported in a strand support device and cooled with coolant.
- the state changes occurring in the course of the continuous casting process are also calculated in real time for the entire strand by means of a mathematical simulation model, including the two-dimensional heat equation, and the cooling of the strand is set as a function of the calculated thermodynamic state changes.
- the object of the invention is to provide a method of the type mentioned, with which the accuracy of the simulation of the thermodynamic state changes of the entire strand can be further increased and in connection with the cooling of the product quality of the metal strand and the production efficiency of the continuous casting process can be improved.
- Heat equation is solved numerically in real time and the cooling of the strand is adjusted taking into account the calculated state changes.
- thermodynamic state changes as a function of the two-dimensional heat conduction in real time and to influence the temperature profile of the strand by means of strand cooling.
- thermodynamic state changes by means of a non-linear, transient heat equation as a function of the three-dimensional heat conduction, namely in strand thickness direction, in the strand width direction and in the strand longitudinal direction, ie. in the extension direction of the strand to calculate in real time and to influence by means of strand cooling targeted.
- the thermodynamic changes in state can be calculated with greater accuracy and be specifically influenced by means of a coordinated strand cooling.
- the strand is divided into individual volume elements, i. so-called discretized, wherein each discrete volume element has an extension in the longitudinal direction of the strand, in the strand thickness direction and in the strand width direction.
- each discrete volume element has an extension in the longitudinal direction of the strand, in the strand thickness direction and in the strand width direction.
- volume elements of the strand are assigned and thereby, first, the thermodynamic state changes in these volume elements, taking into account the heat conduction in all spatial dimensions and the determined by the strand cooling heat quantity can be determined with high accuracy, and secondly, by means of these nozzles, the thermodynamic properties of the strand can be influenced very targeted and with high efficiency.
- the three-dimensional heat equation is solved numerically taking into account the temperature-dependent change in the density of the metal strand. It is known to the person skilled in the art that the change in density of metal as a function of the temperature can assume significant proportions. So m 3 at 1550 0 C (temperature of the melt in the distribution trough) increases for example in the continuous casting process, the density of steel of about 7000 kg / 7800 kg to about / m 3 at 300 0 C ( micerstarrter strand). The density changes are in the continuous casting process in conjunction with the heat equation also in the determination of
- Solidification point relevant As Autoerstarrungstician that point in strand extraction direction is referred to, from which the metal strand is completely solidified, ie. the metal strand no longer has a liquid core.
- the most accurate calculation of the solidification point is extremely advantageous in any case. If the location of the solidification point underestimated, ie. if the calculated point is less far removed from the mold than the actual point in the direction of extension, this can lead to very dangerous casting situations (for example also strand penetration). On the other hand, the allowable casting speed is unnecessarily limited in overestimating the through-solidification point, which in turn would degrade the productivity of the equipment.
- a further, particularly advantageous embodiment of the method according to the invention can be achieved if in the numerical solution of the heat equation, taking into account temperature-dependent
- Density changes of the metal strand approximated equations are used for the enthalpy, which have the exact mass and the exact enthalpy for the entire strand. It should be noted at this point that the exact three-dimensional, nonlinear and unsteady heat equation with regard to the temperature-dependent density change is still unsolved. The thermal equation used today without taking into account the temperature-dependent density change are only rough approximations of the exact equation and their solutions may differ significantly from the exact solution. By using approximate equations for the enthalpy with global - ie. however, if the entire strand is considered - the exact mass and the exact enthalpy - it is ensured that these essential thermodynamic state variables correspond to the exact values.
- the method according to the invention can be carried out particularly favorably if either a finite volume method or a finite element method is used to solve the heat equation in the mathematical simulation model.
- the heat equation is a parabolic partial differential equation that can be solved by standard methods of numerical mathematics, in particular the finite volume method or finite element method (see Chapter 19: Numerical Mathematics by IN Bronstein, KA Semendjajew, G. Musiol , H. Mühlig: Paperback of Mathematics, Verlag Harri Deutsch, 6th edition, 2005).
- the method according to the invention is carried out when the thermodynamic state changes due to the spatial symmetry are calculated only for a quarter of the strand cross-section.
- This simplification can be made due to the spatial symmetry of the strand cross-section and the time-varying boundary conditions without loss of accuracy and allows the three-dimensional heat equation can be solved with high accuracy even by relatively low-performance process computers.
- the method according to the invention can be used without restrictions when casting metal strands with billet, billet, slab or thin slab cross section Any dimensions can be used to improve the quality of the cast metal strands.
- FIG. 1 shows a continuous casting plant in a schematic side view
- FIG. 2 shows a schematic representation of the discretized metal strand
- FIG. 3 shows a comparison of solutions of different formulations of heat conduction equations
- a cooled mold 1 is fed with liquid steel 2, which is supplied from an intermediate vessel 3.
- the forming in the mold 1, a liquid core 4 and initially only a thin strand shell 5 having, strand 6 is an arcuate strand support means 7, which is provided with support rollers 8 and supports the strand at the top and at the bottom, redirected to the horizontal where, after solidification, it is either cut up or transported further as a continuous strand.
- coolant-supplying nozzles 10 are provided along the strand support means, of which in the drawing only those are drawn on the strand top at the beginning of the strand support means 7. In this case, one or more nozzles 10 are connected to a respective supply line 11.
- the amount of coolant applied by the nozzles to the strand can be changed by means of a continuously adjustable valve 12, which has a
- Flow meter 13 is arranged downstream.
- Each valve 12 is adjustable via an actuator 14 that can be actuated via a control element 16 controlled by a central process computer 15.
- Each flow measuring device is coupled via an input unit 17 to the process computer 15, which in turn drives all control elements 16 via an output unit 18.
- the input unit 17 of the process computer 15 for example, the physical parameters of the metal to be cast, in the present case of the steel 2, namely the temperature-dependent values of the density, the specific Heat capacity and thermal conductivity, further the flow-dependent spray pattern of the location-dependent arranged nozzles 10, the location-dependent role division 9, the optionally location-dependent strand thickness, the strand width and the continuously measured casting speed of the continuous casting plant are entered.
- the strand 6 is cooled in a controlled manner at specific, either fixed or variable, positions of the strand support device 7.
- the control of the strand cooling takes place taking into account the thermodynamic state changes of the entire strand 6 by the release in real time of a three-dimensional heat equation using the process computer 15th
- a three-dimensional, nonlinear and transient heat equation in an enthalpy formulation is pE mass ⁇ x, t) (f) dE mass (x, t)) d 2 u (x, t), d 2 u (x, t), d 2 u (x, t)
- a second formulation of a nonlinear, three-dimensional and transient heat equation is d 2 un ⁇ x2, t) where ⁇ (x, t) temperature at the point x at time t in [° K]
- thermodynamical approaches Two approaches are used for a globally correct transformed enthalpy E trans (x, t) with respect to mass and enthalpy.
- T ref is an arbitrary but constant reference temperature (usually 25
- the heat conduction equation is transformed to Lagrangian coordinates x lag , ie viewed by an observer moving along with the strand extraction movement.
- the transformation is
- CastLg (t) [v cast ( ⁇ ) - d ⁇
- tstart is the time of formation of the discrete volume element in the mold in [S]
- This heat equation is solved by the process computer 15 in real time by means of the finite volume method.
- This standard method of numerical mathematics is known to the person skilled in the art and works with discrete volume elements of the strand 6.
- the simple three-dimensional heat equation described in the v- cast moving element-fixed coordinate system is to be solved. This is performed periodically for a plurality of volume elements 20, resulting in the time-varying temperature field of the entire strand 6. From Fig. 2 it can be seen that the strand 6 is divided into discrete volume elements 19, for example, 10 cm edge length.
- the volume elements 19 are produced in the mold and tracked in accordance with the casting speed through the continuous casting plant. As shown in FIG.
- the strand thickness axis x and the strand width axis y are symmetrical to the edges of the solidifying strand 6. Because of this spatial symmetry in strand width and strand thickness direction, it is advantageous to change the thermodynamic state changes only in one quadrant 20, ie one quarter, of the strand cross section.
- the initial condition for a newly created volume element is
- the boundary condition is general
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SI200931321T SI2279053T1 (sl) | 2008-05-21 | 2009-04-22 | Postopek za kontinuirano litje kovinske žile |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT8152008A AT506847B1 (de) | 2008-05-21 | 2008-05-21 | Verfahren zum stranggiessen eines metallstrangs |
| PCT/EP2009/054776 WO2009141205A1 (de) | 2008-05-21 | 2009-04-22 | Verfahren zum stranggiessen eines metallstrangs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2279053A1 true EP2279053A1 (de) | 2011-02-02 |
| EP2279053B1 EP2279053B1 (de) | 2015-08-26 |
Family
ID=40901973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09749695.4A Active EP2279053B1 (de) | 2008-05-21 | 2009-04-22 | Verfahren zum stranggiessen eines metallstrangs |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP2279053B1 (de) |
| KR (1) | KR101573666B1 (de) |
| CN (1) | CN102083573B (de) |
| AT (1) | AT506847B1 (de) |
| ES (1) | ES2548978T3 (de) |
| SI (1) | SI2279053T1 (de) |
| WO (1) | WO2009141205A1 (de) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112011104849B4 (de) * | 2011-02-07 | 2019-05-09 | Primetals Technologies Austria GmbH | Verfahren zur Regelung einer Temperatur eines Strangs durch das Positionieren einer verfahrbaren Kühldüse in einer Strangführung einer Stranggießanlage |
| DE102011082158A1 (de) | 2011-09-06 | 2013-03-07 | Sms Siemag Ag | Gießverfahren, insbesondere Stranggießverfahren |
| EP3437759B1 (de) | 2017-08-04 | 2022-10-12 | Primetals Technologies Austria GmbH | Stranggiessen eines metallischen strangs |
| EP3437756B1 (de) | 2017-08-04 | 2021-12-22 | Primetals Technologies Austria GmbH | Stranggiessen eines metallischen strangs |
| EP3437757A1 (de) | 2017-08-04 | 2019-02-06 | Primetals Technologies Austria GmbH | Stranggiessen eines metallischen strangs |
| KR102098023B1 (ko) | 2018-10-24 | 2020-04-07 | 주식회사 포스코 | 연속 주조기의 온도 설정 장치 |
| EP4631645A1 (de) | 2024-04-08 | 2025-10-15 | Primetals Technologies Austria GmbH | Stranggiessen von langprodukten mit hohem massenstrom |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT408197B (de) * | 1993-05-24 | 2001-09-25 | Voest Alpine Ind Anlagen | Verfahren zum stranggiessen eines metallstranges |
| DE19612420C2 (de) * | 1996-03-28 | 2000-06-29 | Siemens Ag | Verfahren und Einrichtung zur Steuerung der Kühlung eines Stranges in einer Stranggießanlage |
| DE19850253A1 (de) | 1998-10-31 | 2000-05-04 | Schloemann Siemag Ag | Verfahren und System zur Regelung von Kühlstrecken |
| AT409352B (de) * | 2000-06-02 | 2002-07-25 | Voest Alpine Ind Anlagen | Verfahren zum stranggiessen eines metallstranges |
| US7024342B1 (en) * | 2000-07-01 | 2006-04-04 | Mercury Marine | Thermal flow simulation for casting/molding processes |
| DE102005036068A1 (de) * | 2005-08-01 | 2007-02-08 | Siemens Ag | Modellierverfahren für den zeitlichen Verlauf des Zustands eines Stahlvolumens durch einen Rechner und hiermit korrespondierende Gegenstände |
-
2008
- 2008-05-21 AT AT8152008A patent/AT506847B1/de active
-
2009
- 2009-04-22 SI SI200931321T patent/SI2279053T1/sl unknown
- 2009-04-22 WO PCT/EP2009/054776 patent/WO2009141205A1/de not_active Ceased
- 2009-04-22 EP EP09749695.4A patent/EP2279053B1/de active Active
- 2009-04-22 KR KR1020107028210A patent/KR101573666B1/ko active Active
- 2009-04-22 CN CN200980118394.8A patent/CN102083573B/zh active Active
- 2009-04-22 ES ES09749695.4T patent/ES2548978T3/es active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009141205A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| AT506847B1 (de) | 2011-07-15 |
| KR20110020828A (ko) | 2011-03-03 |
| CN102083573B (zh) | 2014-12-10 |
| SI2279053T1 (sl) | 2015-12-31 |
| WO2009141205A1 (de) | 2009-11-26 |
| ES2548978T3 (es) | 2015-10-22 |
| KR101573666B1 (ko) | 2015-12-02 |
| EP2279053B1 (de) | 2015-08-26 |
| AT506847A1 (de) | 2009-12-15 |
| CN102083573A (zh) | 2011-06-01 |
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