EP1499462A1 - Adaptation du transfert de chaleur sur des coquilles pour coulee continue, en particulier au niveau de la surface du bain - Google Patents

Adaptation du transfert de chaleur sur des coquilles pour coulee continue, en particulier au niveau de la surface du bain

Info

Publication number
EP1499462A1
EP1499462A1 EP03727263A EP03727263A EP1499462A1 EP 1499462 A1 EP1499462 A1 EP 1499462A1 EP 03727263 A EP03727263 A EP 03727263A EP 03727263 A EP03727263 A EP 03727263A EP 1499462 A1 EP1499462 A1 EP 1499462A1
Authority
EP
European Patent Office
Prior art keywords
cooling
mold
channels
mold according
contact surface
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.)
Ceased
Application number
EP03727263A
Other languages
German (de)
English (en)
Inventor
Dirk Mangler
Markus Reifferscheid
Uwe Plociennik
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.)
SMS Siemag AG
Original Assignee
SMS Demag AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE10253735A external-priority patent/DE10253735A1/de
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1499462A1 publication Critical patent/EP1499462A1/fr
Ceased legal-status Critical Current

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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/055—Cooling the moulds
    • 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
    • B22D11/059—Mould materials or platings

Definitions

  • the invention relates to a mold for the continuous casting of molten metals, in particular steel, with cooling channels such as cooling grooves, cooling slots or cooling bores in the mold side facing away from the contact surface with the melt.
  • a continuous casting mold in particular a CSP (Compact Strip Production) mold of conventional design in the form of a plate mold, for the continuous casting of ingots or slabs made of steel, is usually formed with side walls, each consisting of a supporting wall and one attached to it, with the metal melt in Conical inner plate exist. Coolant channels which are parallel to one another are preferably provided on the side of the inner plate facing the supporting wall and can be designed as slots which are open to the supporting wall.
  • CSP Cosmetic Strip Production
  • the heat transfer conditions above the mold height, especially in an area above and below the bath level are variable within limits. For example, the wall temperature of the mold above the bath level is lowered. However, if the heat transfer in the area and / or above the bath level is reduced, the temperature of the mold increases. This has the following advantages:
  • the mold which is warmer in the area of the bath level, means that casting powder is melted faster;
  • An assignable diagram of the temperature distribution of the melt in the mold corresponds to the curvature of a lying parabola with t ma ⁇ in the area of the increased heat flow density.
  • Document DE 38 40 448 C2 describes a continuous casting mold, in particular a plate mold, the side walls of which are each formed by a supporting wall and an inner plate attached to it and coming into contact with molten metal, and wherein coolant channels are provided on the side of the inner plate facing the supporting wall, which are designed as slots open to the supporting wall, the width of which is smaller and the depth of which is greater than the width of the ribs lying between the slots.
  • EP 0 551 311 B1 describes a liquid-cooled, width-adjustable plate mold for the continuous casting of steel strands in slab format, in particular for a thickness of less than 100 mm.
  • the broad side plates and narrow side plates are designed in the direction of their transverse extension in the sense of an increase in cross section for the strand, the narrow side plates are arranged essentially parallel to one another over the mold height and the broad side plates are concave at least in the area of the smallest slab width designed in such a way that in cross-section the apex height of the mold wall forming an arc compared to an inscribed rectangle on the pouring side of the mold is a maximum of 12 mm per 1000 mm slab width and the shape of the broad side plates at the strand exit end of the mold corresponds to the strand format to be produced.
  • the broad side plates are designed as a flat surface in the adjustment range of the narrow side plates and slot-like channels are arranged in the side facing away from the shaping side.
  • EP 0 968 779 A1 relates to the formation of a broad side of a slab mold, with a casting plate with an inner surface and an outer surface opposite this, the broad side having an upper and a lower partial region, and at least the upper partial region having a central region and two laterally has side areas arranged therefrom.
  • the document proposes that the inner surface of the pouring plate has grooves with undercuts to form cooling channels, and that the grooves are covered by filler pieces that are inserted into the undercuts.
  • U.S. Patent 5,207,266 relates to a water-cooled copper mold comprising a copper plate with a rear frame attached thereto to form cooling channels, wherein widths of main channels in the region of the mounting bolts are wider than those in other regions.
  • the mold includes the formation of larger channels between right-hand and left-hand channels in the region of the fastening bolts, excluding the bolt connections.
  • Branch channels are provided between the main channels and the enlarged channels, wherein at least branch channels and areas of the main channels have more water surface areas than the main and enlarged channels.
  • the contact plate of the mold which usually consists of a copper alloy, is in "direct contact” with the liquid and solidified metal.
  • the contact plate which is also referred to as a copper plate, is a wearing part and is attached to a carrier element, usually made of steel.
  • the recyclable support element is called a water box.
  • the mold itself acts as a crystallizer, i.e. H. So much energy is withdrawn from the liquid steel that it is brought in that a stable strand shell is created which can then be continuously pulled out of the mold.
  • a first strand shell is formed at the fill level in the mold on the so-called meniscus.
  • meniscus stands for the early development area of the strand shell, in which the contact surface of the mold, solid and molten pouring agent as well as liquid steel and strand shell meet. Casting powder and oils are used as pouring aids. These separate metal and copper from one another by lubrication and control the local heat transfer (Fig. 8).
  • the first strand shell volume element formed on the meniscus migrates with it
  • the cooling channels formed in the mold construction can be made completely within the copper plate or within the water box element. Mixed constructions are also known. In addition, variants are widespread in which filler pieces are arranged between the water tank and the copper plate in such a way that suitable cooling channels are created.
  • Cooling ducts with rectangular or circular cross sections are widely used for manufacturing reasons. Corner areas can be rounded. Suitable fillers also produce U, L and T shapes of any orientation with respect to the contact surface.
  • the typical arrangement of the cooling channels follows the casting direction individually or in groups, i. H. from top to bottom, and usually equidistant from the contact surface to the metal. The aim of the efforts is to achieve the most homogeneous possible cooling effect via the contact surface of the mold, which is often only possible to a limited extent in the area of fastening points. Often, differently designed cooling channels are combined side by side in cross-sectional area and / or geometric shape in order to further optimize the uniformity of the cooling effect across the casting width (FIG. 10).
  • the conventional design of the cooling ducts hitherto aims for a homogeneous cooling effect, whereby the actually existing, inhomogeneous thermal load distribution on the mold plate is not taken into account. Due to the necessary multi-dimensional consideration, two inhomogeneities in the thermal load distribution can be distinguished.
  • the local values in the area of the mold level can be higher by a factor of 1.5 to 3, whereas the values at the mold base can be lower by a factor of 0.3 to 0.6.
  • the location of the maximum is 20 to 70 mm below the actual mold level, depending on the system and process parameters.
  • the absolute values of the average heat flow densities depend on the one hand on casting powder, but in particular also on the casting speed. In the literature, mean heat flow densities of 1.0 MW / m 2 at 0.9 m / min, 2.0 MW / m 2 at 3.0 m / min and 3.0 MW / m 2 at 5.5 m / min are mentioned.
  • the expected local heat flow densities can at least be estimated from the factors mentioned.
  • the uneven distribution of the heat flow density in the casting direction means that the main thermal wear on the mold plate takes place almost without exception in the area of the casting surface. This manifests itself in striations, cracks, deformations and even flaking of any previously applied layers.
  • the load on the mold plate also varies in the width direction. Inhomogeneities usually result from the flow field of the liquid steel that forms in the mold.
  • the processes are closely linked to the geometrical design of the steel feed plunger, the contact surface geometry and other process variables. Stationary and transient processes on the mold level formation result in a mostly plant-specific inhomogeneous formation of the meniscus. Inhomogeneous meniscus formation is also associated with an inhomogeneous heat distribution, so that the main damage does not develop evenly over the mold width, but begins concentrated at certain points.
  • the invention is based on the object of adapting the heat transfer which is decisive for the cooling effect of the cooling channels by a special geometric configuration of the heat-transferring surface areas of a cooling channel or a group thereof to the local heat flow density of the contact surface of the mold in contact with the melt ,
  • the effective heat exchange surfaces on the channel base or on the side walls may be enlarged or reduced.
  • the surface area is substantially enlarged or almost doubled, which leads to a higher heat flow density with a considerably more intensive cooling effect at the same flow rate of the cooling medium, with the significant advantage that the temperatures of the mold be significantly reduced, so that in addition to the lower load on the mold If necessary, the water pressure for the cooling water can also be reduced.
  • the cooling channel surface is not artificially enlarged above the bath level, because in this area of the mold the heat transfer should rather be reduced in order to support the melting of the mold powder.
  • the heat transfer above the bath level is reduced by:
  • the measure that the heat dissipation of the heat-transferring surface areas of the cooling channels is carried out by adapting to the heat flow density distribution over the height of the mold has proven to be particularly expedient.
  • the temperature profiles along the mold height in the mold are made even more uniform and larger material tensions in the strand shell being created are avoided and their formation of cracks is prevented.
  • FIG. 1 shows a section of a mold wall, in an enlarged section, perpendicular to its course
  • FIG. 2 another section of the mold wall according to FIG. 1, also in section,
  • FIG. 3 cooling channel bores with grooves on their inner surfaces
  • FIGS. 4 and 5 comparative parts of heat exchange surfaces without and with an enlarged base surface
  • FIG. 6 shows the course of the heat flow density q over the height H of the mold below the bath level
  • FIG. 7 shows a diagram of the depth of the grooves R above the height of the mold with an associated profile of a temperature curve T, likewise below the bath level with T max above and below the meniscus area
  • FIG. 9 shows two diagrams for comparison, with the mean or global heat flow density or temperature
  • FIG. 11 further forms of training of heat exchanger plates
  • FIG. 12 shows a distribution of the over the mold height
  • FIG. 1 shows an enlarged section 10 of a side 2 of a mold wall facing away from the melt with a slot-like cooling groove 1 arranged therein.
  • This has a width B and a depth T.
  • the bottom region of the cooling groove 1 has a profile 3 with grooves - Forms, whereby its area compared to a flat design, eg. B. according to Figure 4, is approximately doubled.
  • the heat transfer of the heat-transferring surface areas of the cooling groove slots or bores can be carried out by varying the height of the mold to its heat flow density distribution, as is shown, for example, in FIG. 6.
  • the grooves 3 have a variable depth 4, for example between 1 and 4 mm, for the purpose of varying the intensity of the heat transfer, and are each formed with an opening angle between 30 ° and 60 °, as shown purely by way of example in FIG. 7 is.
  • the grooves 3 can be formed with an opening angle of up to approx. 60 ° and a height of up to approx. 4 mm at intervals "A" and resemble the profile of a thread.
  • other shapes such as corrugated, trapezoidal, tooth-shaped or the like, can be provided, which lead to an enlargement of the cooling surface.
  • FIG. 2 shows a section 10 of a mold wall, each comprising a piece of a support wall 5 with a piece of an inner plate 6, which are connected tightly to one another, in particular are screwed together.
  • the inner plate 6 is penetrated by cooling channels 7, which are designed as slots that are open against the supporting wall 5 and covered by the supporting wall 5.
  • the slots are provided on their bottoms with heat exchanger surfaces 3 penetrated by grooves, which result in an artificially increased heat flow density.
  • FIG. 3 shows any section 10 of a mold wall with cooling channel bores 8 arranged therein with inner walls 9 designed in the form of grooves or grooves 3.
  • FIGS. 4 and 5 show a smooth 11 and a configuration consisting of grooves 12 and the associated temperature values on the basis of indicated parts of coolant channels 7, 7 ', with the formation of heat exchanger plates 11 and 12 to be compared with one another.
  • FIG. 6 shows a heat flow density distribution according to the invention, adjusted over the height of the mold, with q ma ⁇ in a limited area below the bath level (bath).
  • the temperature curve T in FIG. 7 shows a temperature maximum T max within a range 13 to 17 of variable depth R of the heat-exchanging grooves with Rm ax between points 14 and 15.
  • the heat exchanger grooves (3) start at 13 at the level of the bath level.
  • the maximum groove depth (4) is reached at 14. This maximum groove depth goes up to 15 and is reduced again to the original level on the way over 16.
  • FIG. 8 shows in section a broad side wall of a mold, comprising a support plate 20 with a contact plate 18 fastened to it, a layer of pouring aid and indicated coolant channel 7, a strand shell 19 building up in the casting direction and an assignable heat flow.
  • FIG. 9 represents a supplement to FIGS. 6 and 7, with the course of the local heat flow density / temperature as shown in diagrams in comparison to the heat-transferring cooling channel surface as a function of the position of the meniscus.
  • Figures 10 and 11 show different design options in the design of cooling slots, and in particular of their bottom region.
  • FIG. 12 shows in the form of a table:

Landscapes

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

Abstract

L'invention concerne une coquille pour la coulée continue de métaux en fusion, en particulier d'acier, laquelle coquille comporte des canaux de refroidissement (1) tels que des rainures de refroidissement, des fentes de refroidissement ou des trous de refroidissement formés dans la face (2) de la coquille opposée à la surface de contact avec le métal fondu. Le transfert de chaleur de la coquille est amélioré, du fait que la structure géométrique des zones superficielles de transfert de chaleur d'un canal de refroidissement (1) ou d'un groupe de canaux de refroidissement, notamment leur forme, surface transversale, périmètre, qualité d'interface, orientation par rapport à la surface de contact, agencement et/ou densité par rapport à ladite surface de contact, est adaptée à la densité de flux de chaleur et/ou température locales présentées par la surface de contact (18) pendant la coulée, et en particulier au niveau de la surface du bain (11).
EP03727263A 2002-04-27 2003-03-08 Adaptation du transfert de chaleur sur des coquilles pour coulee continue, en particulier au niveau de la surface du bain Ceased EP1499462A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10218956 2002-04-27
DE10218956 2002-04-27
DE10253735 2002-11-19
DE10253735A DE10253735A1 (de) 2002-04-27 2002-11-19 Intensivierung des Wärmeüberganges bei Stranggießkokillen
PCT/EP2003/002384 WO2003092931A1 (fr) 2002-04-27 2003-03-08 Adaptation du transfert de chaleur sur des coquilles pour coulee continue, en particulier au niveau de la surface du bain

Publications (1)

Publication Number Publication Date
EP1499462A1 true EP1499462A1 (fr) 2005-01-26

Family

ID=29403559

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03727263A Ceased EP1499462A1 (fr) 2002-04-27 2003-03-08 Adaptation du transfert de chaleur sur des coquilles pour coulee continue, en particulier au niveau de la surface du bain

Country Status (12)

Country Link
US (1) US20050115695A1 (fr)
EP (1) EP1499462A1 (fr)
JP (1) JP2005529750A (fr)
CN (1) CN1318164C (fr)
AU (1) AU2003233795A1 (fr)
BR (1) BR0307901A (fr)
CA (1) CA2483784A1 (fr)
MX (1) MXPA04010647A (fr)
PL (1) PL371553A1 (fr)
RU (1) RU2310543C2 (fr)
TW (1) TWI268821B (fr)
WO (1) WO2003092931A1 (fr)

Families Citing this family (14)

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DE102005026329A1 (de) 2005-06-07 2006-12-14 Km Europa Metal Ag Flüssigkeitsgekühlte Kokille zum Stranggießen von Metallen
WO2010015399A1 (fr) * 2008-08-06 2010-02-11 Sms Siemag Ag Lingotière de coulée continue pour métal en fusion, en particulier pour acier en fusion
EP2292350A1 (fr) * 2009-08-04 2011-03-09 Siemens VAI Metals Technologies S.r.l. Moule pour le moulage en continu de produits longs ou plats, gaine de refroidissement conçue pour coopérer avec un tel moule et ensemble comprenant un tel moule et une telle gaine de refroidissement
DE102010007812B4 (de) 2010-02-11 2017-04-20 Ksm Castings Group Gmbh Verfahren und Vorrichtung zur Herstellung von Kraftfahrzeug-Fahrwerksteilen
IT1403036B1 (it) * 2010-11-25 2013-09-27 Danieli Off Mecc Cristallizzatore per colata continua
CN102078947B (zh) * 2011-02-23 2012-12-19 中冶南方工程技术有限公司 用于连铸结晶器凝固传热过程热流密度的计算方法
JP6105296B2 (ja) 2013-01-11 2017-03-29 株式会社神戸製鋼所 チタンまたはチタン合金からなる鋳塊の連続鋳造方法
AT515566A1 (de) * 2014-03-06 2015-10-15 Inteco Special Melting Technologies Gmbh Verfahren zur Kühlung von flüssigkeitsgekühlten Kokillen für metallurgische Prozesse
ITUB20154787A1 (it) * 2015-11-06 2017-05-06 Milorad Pavlicevic Cristallizzatore perfezionato e lingottiera adottante detto cristallizzatore
US11020794B2 (en) 2016-10-19 2021-06-01 Jfe Steel Corporation Continuous casting mold and method for continuously casting steel
DE102017206914A1 (de) 2017-04-25 2018-10-25 Sms Group Gmbh Stranggießkokille mit strömungsoptimierter Kühlung
EP3406368A1 (fr) * 2017-05-23 2018-11-28 SMS Concast AG Lingotière pour la coulée en continu de produits métalliques
RU2678556C1 (ru) * 2017-09-18 2019-01-29 Акционерное общество "Первоуральский новотрубный завод" (АО "ПНТЗ") Гильза кристаллизатора для непрерывной разливки сталей
CN109822065B (zh) * 2019-04-11 2024-03-22 安徽工业大学 一种连铸结晶器的宽面铜板及具有该铜板的连铸结晶器

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Also Published As

Publication number Publication date
RU2310543C2 (ru) 2007-11-20
CN1318164C (zh) 2007-05-30
TW200400093A (en) 2004-01-01
RU2004134598A (ru) 2005-06-10
JP2005529750A (ja) 2005-10-06
PL371553A1 (en) 2005-06-27
CA2483784A1 (fr) 2003-11-13
CN1649685A (zh) 2005-08-03
WO2003092931A1 (fr) 2003-11-13
US20050115695A1 (en) 2005-06-02
MXPA04010647A (es) 2005-02-17
BR0307901A (pt) 2004-12-21
TWI268821B (en) 2006-12-21
AU2003233795A1 (en) 2003-11-17

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