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EP0363375B1 - Dispositif de coulee continue - Google Patents

Dispositif de coulee continue Download PDF

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Publication number
EP0363375B1
EP0363375B1 EP88903813A EP88903813A EP0363375B1 EP 0363375 B1 EP0363375 B1 EP 0363375B1 EP 88903813 A EP88903813 A EP 88903813A EP 88903813 A EP88903813 A EP 88903813A EP 0363375 B1 EP0363375 B1 EP 0363375B1
Authority
EP
European Patent Office
Prior art keywords
cooling
continuous casting
primary
cooler
casting apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88903813A
Other languages
German (de)
English (en)
Other versions
EP0363375A1 (fr
Inventor
Hans Horst
Werner S. Horst
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Priority to AT88903813T priority Critical patent/ATE66840T1/de
Publication of EP0363375A1 publication Critical patent/EP0363375A1/fr
Application granted granted Critical
Publication of EP0363375B1 publication Critical patent/EP0363375B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B22D11/045—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for horizontal casting
    • 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
    • B22D11/047—Means for joining tundish to mould

Definitions

  • the invention relates to a continuous casting device according to the preamble of claim 1.
  • Conventional continuous casting devices consist of a mold which is made from a graphite tube or at least has a graphite layer on its inner surface.
  • a mold which is made from a graphite tube or at least has a graphite layer on its inner surface.
  • conventional molds are usually designed to protrude into the melting chamber.
  • this basically has the disadvantage in terms of process technology that considerable amounts of heat are withdrawn from the furnace and, above all, from the material to be cast, which then have to flow off to the surrounding cooler via the mold wall, the one from the EP has nevertheless -A-0158898 known continuous casting device very proven.
  • this known continuous casting device has the essential advantage, which is decisive in comparison with other known devices, that the cooling mold is made of a casting material which is made in the Shrink fit surrounds the cast-in cooling pipe and the spiral cooling pipe surrounding the cooling pipe and through which the coolant medium flows.
  • a two-part mold has also become known, for example, from DE-A-2058051 and from DE-U1-1854884.
  • the mold is divided in two in the longitudinal direction, whereby in the first-mentioned publication the cooling device following the introductory part is divided into two different zones, which differ in the use of different materials on the inner cooling central tube.
  • the much larger and longer part of the cooling central tube is also made of graphite in this prior art, which is why the disadvantages mentioned above exist and occur here.
  • a continuous casting mold with a primary and a secondary cooler is also from "Soviet Invention Illustrated", Section CH, Week K46, December 28, 1983 Derwent Publications Ltd. (London, (GB) - Summary No. 819305, Class M22 & SU-A-990,411, January 23, 1983 (D1).
  • this two-part mold is not suitable for practical operation in many respects due to the conically overlapping arrangement between the primary and secondary coolers and because of the changing inner diameter from the primary to the secondary mold.
  • due to the overlapping conical arrangement of the primary and secondary coolers a large heat flow is already caused in the primary cooler.
  • a two-part continuous casting mold can also be found in GB-A-1227312, in which the secondary cooler consists of copper or a copper alloy, ie a harder material than graphite.
  • Primary and secondary coolers in this case comprise a cooling device in the form of a plurality of cooling tubes lying transversely to the longitudinal direction of the mold.
  • the present invention for the first time creates a continuous casting device in which particularly favorable continuous casting properties can be achieved due to the relatively small axial length of the primary cooler with a comparatively large inner diameter in cooperation with the secondary cooler.
  • the secondary cooler which has a much greater axial length, enables optimized, controlled cooling of the continuous casting while avoiding graphite for the cooling central tube.
  • the use of a cooling coil known per se is just as important as the feature known from EP-A-0158898, in particular, that the central tube, like the cooling coil, is encapsulated by the metal of the heat sink in a shrink fit. This is the only way to achieve the absolutely necessary heat transfer coefficients.
  • the tubular feed part anchored to the crucible can extend as far as the secondary cooler, the extremely short primary cooler only surrounding the lower section of the tubular feed part immediately adjacent to the secondary cooler.
  • This front feed part can consist of good heat-conducting, high-quality graphite which is not soluble in the melt. Due to this short length, the graphite costs for this wearing part are kept extremely low.
  • the wall temperature of this short primary cooler can be regulated so high that it completely solidifies over the entire length of the strand without any noticeable shrinkage taking place.
  • this has the advantage that sufficient hot metal always flows into the short hot feed part of the cooling device and the gases released during the solidification and dissolved in the melt can escape in countercurrent without the metal temperature of the melt and, associated therewith, its gas content disadvantageously to have to lift high.
  • the larger part of the cooling mold, namely the secondary cooler, is designed as a reusable component. It proves to be particularly advantageous here that the use of graphite can be dispensed with in the continuous casting device according to the invention in this secondary cooler, which accounts for the largest part of the longitudinal extent. This saves extreme costs and also ensures that the secondary cooler is continuously reused.
  • a carbide compound in particular silicon carbide, is particularly suitable for the cooling central tube in the secondary cooler.
  • this mold is extremely light and therefore easy to handle.
  • the continuous casting device according to the invention With the continuous casting device according to the invention, the casting performance can also be increased by more than 30% compared to conventional continuous casting devices.
  • the continuous casting device according to the invention is suitable for both horizontal and vertical operation. Above all, it can be used for a continuous continuous casting process, although it is of course also suitable for discontinuous operation. It is precisely here that the particular advantages of the invention are shown by the use of a highly wear-resistant, highly heat-conducting, thermo-shock-resistant and at the same time extremely hard, polishable material such as ceramic material for the inner cooling central tube, which can often be used without otherwise having to rework the inner surface of the casting mold. The otherwise considerable wear of graphite molds during discontinuous continuous casting is obviously avoided here.
  • FIG. 1 denotes the bottom and side walls of a holding furnace in which there is a melt 3.
  • a feed part 5 of the continuous casting device is provided so as to protrude, the opening of which is provided in a known manner with an insert 7 made of refractory material which is not soluble in the melt and has passages 9.
  • the end of the feed part 5 opposite the insert 7 in the continuous casting direction is fitted in a conical or cylindrical seat of a primary cooling 11 in the manner of a cooling ring. 13 with thermal insulation is designated, which sits between the furnace wall 1 and the primary cooler 11 designed as a cooling ring.
  • the cooling itself takes place through a cooling spiral 15 provided in the primary cooler 11.
  • the amount of cooling water required for cooling is adjusted accordingly by a control valve 19 arranged in the inflow line 17 for the cooling spiral 15, which is regulated and controlled in a known manner by the temperature of the exiting heated cooling water via a thermal sensor 23 arranged in the outlet pipe 21.
  • the primary cooling 11 designed as a cooling ring sits with only a small longitudinal extension at the end of the feed part 5 directly in front of the subsequent secondary cooler 25.
  • a favorable ratio of the length of this cooled primary or feed part 5, which is pressed into the surrounding metal cooler, to the inner diameter the tubular feed part 5 is less than 60: 100; 50: 100, 40: 100 or 35: 100.
  • the mentioned inner diameter of the tubular feed part 5 corresponds to the outer diameter of the casting strand taking into account the shrinkage factor.
  • the material for the feed part 5 is generally high-quality graphite which is a good heat conductor and is not soluble in the melt.
  • the use of e.g. Boron nitride Due to the relative shortness of the cooled feed part 5, the temperature in the foremost part of the feed part 5 protruding into the crucible is only approximately 60 ° to 110 ° C. less than the temperature range of the melt 3. This realizes the advantage that the melt is little Heat is removed.
  • the extreme ratio of the short length of the primary cooler to its diameter results in a high ⁇ T of at least 550 ° C. to 600 ° C. at the inlet of the primary cooler 11 and less than 200 ° C. at the end of the cooler, especially when entering the primary cooler.
  • the wall temperature on the short primary cooler is still so high that in this front primary cooler a complete edge rigidity over the entire strand circumference occurs, but no noticeable shrinkage.
  • the cooling disc 11 is designed in the manner of a flat cone. It consists of highly thermally conductive metal or a likewise highly thermally conductive metal alloy, e.g. Copper or copper with e.g. 0.5 to 0.7% Si with 1% to 1.2% Ni, i.e. a hardenable, heat-resistant Cu alloy. Discarding this primary cooling disk 11 is almost impossible due to its special, compact shape.
  • the cast-in cooling spirals 15 eliminate the need for expensive machining of cooling channels, as in the case of traditional coolers. Likewise, the welding or brazing otherwise required is not required.
  • the primary cooler 11 is followed by the secondary cooler 25, the inner cooling central tube 27 of which consists of highly thermally conductive ceramic material.
  • the cooling central tube 27 is surrounded by the actual cooler made of highly thermally conductive metal, such as aluminum or an aluminum lining, which are joint-tight to the feed part 5 by means of a snug fit 31 and anchor bolts 33, but are easily detachably connected.
  • the cooling tubes 17 and 21 of the primary cooling circuit are guided in axial alignment through the cooler 25 such that they pass into the cooling spirals 15 in the primary cooler 11.
  • the cooling coil 35 of the secondary cooler 25 like the inner cooling central tube 27, which is made of ceramic material, is connected in a heat-conducting manner by the metal of the cooler 25 which is shrinking around both.
  • the temperature of the secondary cooler 25 is regulated by a further thermal sensor 39 located in the outlet pipe 37, which controls the control valve 41 in the feed pipe 43 of the secondary cooler 25.
  • thermocouple 45 with a thermocouple is designated, which is installed between the inner wall of the cooler 25 and the ceramic central cooling tube 27 just behind the transition of the supply part 5 to the secondary cooler 25.
  • This thermocouple 45 influences the casting speed, ie the strand transport and its speed, in such a way that it is ensured that the edge rigidity of the casting strand in the feed part 5 is completed.
  • FIG. 47 denotes the position of the phase boundary immediately after the end of the pull period, while line 49 shows the solidification front moved back towards the furnace during the stop period.
  • thermocouple 45 effects the regulation of the pull-off speed, for which purpose the thermocouple 45 controls a sensor designated 51 in the drawing, to limit the phase limit at the level of the connection or shortly before the connection between the feed part 5 and the secondary cooler 25.
  • the thermocouple shows 45 an increasing temperature above a set value as a result of the displacement of a phase boundary, the casting speed is reduced via the transmitter 51, as a result of which the temperature measured again at the thermocouple 45 drops.
  • the production of the secondary cooler by simultaneously casting around the inner ceramic cooling central tube 27 and the cooling spiral 35 is particularly cost-saving and efficient. After pouring, the inner cooling central tube 27 forms a firm, non-detachable shrink connection with the surrounding metal of the secondary cooler 25, the inner cooling surface of which no longer has to be machined.
  • FIG. 2 A further exemplary embodiment of the invention is explained below with reference to FIG. 2, in which the same components as in FIG. 1 are provided with corresponding reference symbols.
  • the exemplary embodiment according to FIG. 2 relates to a vertical continuous casting device, in particular for heavy metal alloys.
  • the entire furnace can be protected here by additional floor insulation 61, 63 being a floor plate.
  • the feed part is let into the furnace bottom 1 by means of a fitting piece 65.
  • the fitting 65 lies on the cooling ring-like primary cooler 11 or on the insulation 13 provided there.
  • 67 denotes a hollow casting mandrel, preferably made of graphite, which is precisely in by means of a graphite plug 69 and a centering 71 the middle of the feed part 5 is held.
  • the plug 70 made of refractory cement prevents direct heat flow from the melt to the casting mandrel and prevents possible leakages of melt through the thread 73 into the interior of the casting strand 75.
  • Ceramic materials are particularly suitable for the central cooling pipe.
  • Carbides or carbide compounds are particularly recommended.
  • boron and silicon carbides are considered as covalent carbides, which are hard, difficult to melt and chemically inert.
  • Most metallic carbides are non-stoichiometric compounds of an alloy character. They are resistant to acids, usually harder than the pure metal components and conduct the electrical current.
  • Carbides of chromium, tungsten, hafnium, molybdenum, nadium, niobium, tantalum and titanium are technically important.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Handcart (AREA)
  • Vehicle Body Suspensions (AREA)
  • Body Structure For Vehicles (AREA)

Claims (10)

1. Dispositif de coulée continue fonctionnant verticalement et/ou horizontalement, avec une pièce d'alimentation (5) pouvant être montée sur un creuset (1) et entourant éventuellement une broche de coulée (67) et une section de coquille de refroidissement adjacente entourant un tube central de refroidissement (27), ladite coquille étant constituée d'un tube central de refroidissement (27), d'une spirale de refroidissement (35) ainsi que d'un matériau de refroidisseur entourant, avec ajustage fretté, le tube de refroidissement (27) et la spirale de refroidissement (35), caractérisé en ce qu'il est prévu en outre un refroidisseur primaire et secondaire (11, 25) avec un circuit de fluide de refroidissement séparé (15, 35) dans leurs corps de refroidissement, ces refroidisseurs étant montés sur la pièce de refroidissement (5) avec décalage de l'un par rapport à l'autre en direction axiale, en ce que le rapport de l'extension longitudinale du refroidisseur primaire (11) dans la direction de la coulée continue au diamètre intérieur du refroidisseur primaire (11) est inférieur à 60: 100 et en ce que le tube central de refroidissement (27) du refroidisseur secondaire (25) s'étendant sur une plus grande longueur par rapport au refroidisseur primaire (11) est constitué, au moins sur sa face intérieure, d'un matériau exempt de graphite dont la dureté est supérieure à celle du graphite.
2. Dispositif de coulée continue selon la revendication 1, caractérisé en ce que le tube intérieur du refroidisseur primaire (11) ou son revêtement intérieur est constitué de nitride de bore ou, de préférence, de graphite.
3. Dispositif de coulée continue selon la revendication 1 ou 2, caractérisé en ce que la pièce d'alimentation tubulaire (5) s'étend dans la direction de la coulée continue jusqu'au tube central de refroidissement (27) du refroidisseur secondaire (25) et en ce que le refroidisseur primaire (11) se présente sous forme d'un anneau de refroidissement entourant la pièce d'alimentation (5).
4. Dispositif de coulée continue selon la revendication 1, caractérisé en ce que l'anneau de refroidissement (11) entourant la pièce d'alimentation (5) se trouve à l'extrémité de la pièce d'alimentation tubulaire (5), à proximité du refroidisseur secondaire (25).
5. Dispositif de coulée continue selon l'une des revendications 1 à 4, caractérisé en ce que le rapport de l'extension longitudinale au diamètre extérieur ou intérieur du tube de refroidissement (pièce d'alimentation 5) du refroidisseur primaire (11) est inférieur à 50: 100 et est, de préférence, inférieur à 40: 10.
6. Dispositif de coulée continue selon l'une des revendications 1 à 5, caractérisé en ce que le matériau du tube central de refroidissement (27) est constitué d'un matériau extrêmement dur résistant aux chocs thermiques et à faible dilatation thermique.
7. Dispositif de coulée continue selon l'une des revendications 1 à 6, caractérisé en ce que le tube central de refroidissement (27) est constitué de ou comprend un carbure, un composé de carbure et, de préférence, un carbure de silicium ou une céramique.
8. Dispositif de coulée continue selon l'une des revendications 1 à 7, caractérisé en ce qu'il est prévu un détecteur thermique (23) dans le circuit de refroidissement du refroidisseur primaire (11), pour commander une vanne de régulation (19) réglant le débit du fluide de refroidissement.
9. Dispositif de coulée continue selon la revendication 8, caractérisé en ce que le détecteur thermique (23) est disposé dans le tube de sortie correspondant (21) de la spirale de refroidissement (35) pour mesurer la température du fluide de refroidissement chauffé.
10. Dispositif de coulée continue selon l'une des revendications 1 à 9, caractérisé en ce qu'un thermo-élément (45) est disposé dans la zone de transition du refroidisseur primaire au refroidisseur secondaire (11, 25) pour régler la vitesse d'extraction du brin de coulée solidifié (75).
EP88903813A 1987-04-28 1988-04-27 Dispositif de coulee continue Expired - Lifetime EP0363375B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88903813T ATE66840T1 (de) 1987-04-28 1988-04-27 Stranggiessvorrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873714139 DE3714139A1 (de) 1987-04-28 1987-04-28 Stranggiessvorrichtung
DE3714139 1987-04-28

Publications (2)

Publication Number Publication Date
EP0363375A1 EP0363375A1 (fr) 1990-04-18
EP0363375B1 true EP0363375B1 (fr) 1991-09-04

Family

ID=6326432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88903813A Expired - Lifetime EP0363375B1 (fr) 1987-04-28 1988-04-27 Dispositif de coulee continue

Country Status (8)

Country Link
US (1) US5027881A (fr)
EP (1) EP0363375B1 (fr)
AT (1) ATE66840T1 (fr)
AU (1) AU640342B2 (fr)
CA (1) CA1327111C (fr)
DE (2) DE3714139A1 (fr)
NZ (1) NZ224397A (fr)
WO (1) WO1988008344A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100331152B1 (ko) * 1999-06-28 2002-04-01 황해웅 무산소동이나 특수합금동의 일체형 수평연속주조 설비 및 탈산·정제방법
AU2001280541A1 (en) 2000-07-17 2002-01-30 Consolidated Engineering Company, Inc. Methods and apparatus for utilization of chills for castings
AU2003250533A1 (en) * 2002-07-22 2004-02-09 Showa Denko K.K. Continuous cast aluminum alloy rod and production method and apparatus thereof
WO2011049698A2 (fr) 2009-10-19 2011-04-28 Micropyretics Heaters International, Inc. Dispositifs de protection électrique d'énergie verte propre pour des matériaux
EP3088101A4 (fr) * 2013-12-23 2017-08-09 Shigin, Victor Victorovich Procédé de coulage et de laminage combinés d'alliages de cuivre à partir de rebuts de cuivre
CN104057039A (zh) * 2014-06-19 2014-09-24 无锡隆达金属材料有限公司 热冷组合型水平连铸专用内冷式封炉压板
KR102222896B1 (ko) * 2019-08-02 2021-03-03 권상철 연속 주조용 냉각튜브 어셈블리 및 이를 포함하는 연속 주조용 냉각 장치

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2169893A (en) * 1937-11-01 1939-08-15 Chase Brass & Copper Co Cooling means for continuous casting apparatus
GB1227312A (fr) * 1967-02-06 1971-04-07
AT287215B (de) * 1968-01-09 1971-01-11 Boehler & Co Ag Geb Verfahren und Vorrichtung zum Elektroschlackenumschmelzen von Metallen, insbesondere von Stählen
US3730251A (en) * 1971-06-21 1973-05-01 Gen Motors Corp Method of continuous casting
GB1431729A (en) * 1973-08-04 1976-04-14 Hitachi Shipbuilding Eng Co Copper alloy and mould produced therefrom
CH568113A5 (fr) * 1974-05-15 1975-10-31 Concast Ag
CH577352A5 (fr) * 1975-02-28 1976-07-15 Concast Ag
SU950490A1 (ru) * 1981-01-28 1982-08-15 Липецкий Филиал Всесоюзного Проектно-Технологического Института Литейного Производства Кристаллизатор дл непрерывного лить полых заготовок
DE3578045D1 (de) * 1984-04-13 1990-07-12 Hans Horst Stranggiessvorrichtung und verfahren zu deren herstellung.
US4669529A (en) * 1984-12-03 1987-06-02 Egon Evertz Continuous casting mould
US4774996A (en) * 1986-09-29 1988-10-04 Steel Casting Engineering, Ltd. Moving plate continuous casting aftercooler
US4789021A (en) * 1986-09-29 1988-12-06 Steel Casting Engineering, Ltd. Short mold for continuous casting

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Soviet Inventions Illustrated, Section CH, week K46, 28 December 1983, Derwent Publications Ltd, London (GB), abstract no. 819305, Class M22 & SU,A,990411 (Don Poly) 23 January 1983 *

Also Published As

Publication number Publication date
EP0363375A1 (fr) 1990-04-18
AU1706288A (en) 1988-12-02
DE3864686D1 (de) 1991-10-10
DE3714139A1 (de) 1987-10-22
CA1327111C (fr) 1994-02-22
AU640342B2 (en) 1993-08-26
WO1988008344A1 (fr) 1988-11-03
ATE66840T1 (de) 1991-09-15
US5027881A (en) 1991-07-02
NZ224397A (en) 1991-01-29

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