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EP0714716B1 - Dispositif de coulée continue entre cylindres a capotage d'inertage - Google Patents

Dispositif de coulée continue entre cylindres a capotage d'inertage Download PDF

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Publication number
EP0714716B1
EP0714716B1 EP95402514A EP95402514A EP0714716B1 EP 0714716 B1 EP0714716 B1 EP 0714716B1 EP 95402514 A EP95402514 A EP 95402514A EP 95402514 A EP95402514 A EP 95402514A EP 0714716 B1 EP0714716 B1 EP 0714716B1
Authority
EP
European Patent Office
Prior art keywords
roll
shroud
walls
gas
cylinders
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
EP95402514A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0714716A1 (fr
Inventor
Jacques Barbe
Jean-Marie Pelletier
Pierre Delassus
Gerhard Pateisky
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.)
Thyssen Stahl AG
USINOR SA
Original Assignee
Thyssen Stahl AG
USINOR SA
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 Thyssen Stahl AG, USINOR SA filed Critical Thyssen Stahl AG
Publication of EP0714716A1 publication Critical patent/EP0714716A1/fr
Application granted granted Critical
Publication of EP0714716B1 publication Critical patent/EP0714716B1/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
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/064—Accessories therefor for supplying molten metal
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0697—Accessories therefor for casting in a protected atmosphere

Definitions

  • the present invention relates to a device for continuous casting between cylinders with a cover of inerting the casting space defined between the said cylinders.
  • a known problem is that the metal in the pouring space tends to cool on the surface and thus creating parasitic solidifications which harm the proper functioning of the installation. to remedy this problem, it has already been proposed to place above the casting space a thermally insulating cover.
  • the document EP-A-0409645 describes a installation in which injection channels of a inert gases are arranged against the side walls longitudinal of a cover covering the pouring space, these channels having a slit directed towards the surface cylinders, so as to blow towards this surface said inert gas, to remove the film of entrained air by the cylinders during their rotation, and particularly the air contained in the roughness hollows of the said surface, this in order to prevent the said air from penetrate into the casting space and therefore maintain there a non-oxidizing atmosphere.
  • the present invention aims in particular to solve these problems and is particularly aimed at propose a rollover system to ensure a reliable inerting of the pouring space, control efficient of the nature and quantity of the gas supplied by the surface roughness of the cylinders, which influences, remaining trapped in the hollows of roughness between the cylinders and the skin of solidified metal, on the flow thermal between said metal and the walls of the cylinders, and therefore on the solidification conditions and on the form of said walls.
  • the object of the invention is a continuous casting device between cylinders comprising two counter-rotating cylinders, of axes parallel, defining between them a casting space, a cowling placed above the pouring space and having two longitudinal walls which extend respectively along the surface of each cylinder and which are provided with gas supply pipes opening onto the said surfaces, characterized in that each wall has sealing means by pressure drop, to create a pressure drop in a area between said wall and the surface of the cylinder corresponding and between two of the said conduits, so that the gas flow brought by the conduit being in upstream, relative to the direction of rotation of the cylinder, i.e. directed towards the outside of the cowling, and the gas flow brought by the downstream conduit is directed towards casting space.
  • the said sealing means by loss of load are formed by a protrusion from the wall extending between the said conduits up to direct proximity of the cylinder surface, and they may have longitudinal grooves, parallel to said conduits; these grooves, being located in the direct vicinity of the surface of each cylinder, constitute with it, a series of baffles accentuating the pressure drop between the conduits.
  • these are drilled in said walls and said orifices preferably consist of a continuous slot along the length of said conduits, or of several slots adjacent, and the conduits comprise, at least in the area of said orifices opening facing the surface of the cylinder, a porous material.
  • the device comprises means for controlling the position of the rollover relative to the surface of the cylinder.
  • These means comprising for example position sensors linked to the rollover and measuring the distance variations of the surface of the cylinders with respect to said rollover, and cylinders for adjusting the position of the cowling relative to to the chassis of the device, maintain the conduits and especially the sealing means by loss of charge at substantially constant distance from the surface cylinders, when it deforms by expansion thermal, so that the pressure drop between the ducts remains substantially constant and as high as possible.
  • FIG. 1 and 2 there is shown schematically, in section along a plane perpendicular to the axes of the cylinders, the area supply of molten metal to a continuous casting.
  • This installation includes two casting cylinders 1, 2 including the external wall 3, conventionally made up of a ferrule, is energetically cooled.
  • the cylinders 1 and 2 are driven in rotation according to arrow F.
  • a cover 4 for inerting and of thermal insulation is located above the space of casting 5 defined between the two cylinders.
  • the rollover is connected to a distributor 6 containing the molten metal, on which is fixed a supply nozzle 7 which extends vertically into the casting space 5.
  • Shutter means 8 such as for example a drawer system of known type, are placed on the distributor, to be able to close the nozzle 7.
  • the cowling 4 is tightly connected to this system at drawer by sealing means 9, surrounding the nozzle, for example, as shown in the figures 1 and 2, a sand joint system; these means sealing allow a slight offset between the distributor and the casting installation, while retaining the required seal, and therefore allow simultaneous inerting of the nozzle.
  • the cowling 4 is maintained on the installation by support means 10 adjustable, in particular height, so that longitudinal walls 41 of the rollover be maintained above the ferrules 3 of cylinders, a short distance from their surfaces.
  • the longitudinal walls 41 therefore extend parallel to the axes of cylinders 1, 2, over the entire width of the ferrules, and bear on their face directed towards inside the enclosure, a protective coating thermal constituted for example by elements refractories 42 which extend down below the said longitudinal walls 41 to near the cylinder surfaces, so as to protect the said thermal radiation walls of the molten metal contained in the pouring space.
  • a waterproof cover 43 provides the connection between the longitudinal walls 41 and the sealing means 9.
  • the cover 43 has walls frontal 44 which extend vertically to lateral closing walls 11, conventionally placed against the edges of the cylinders to seal the space of casting towards said ends of the cylinders.
  • these closure walls known by elsewhere generally have a metal housing 12, of which only the upper part is shown Figure 2, which supports a refractory lining 13 applied against the edges of the ferrules 3.
  • Means dynamic seals 14 are provided between the lower ends of the front walls 44 of the cowling and said lateral closure walls 11, these dynamic sealing means being preferably consisting of a sealing system with baffles, which ensures leak tightness load without direct contact between the casing 12 and the cowling 4.
  • a satisfactory seal can be obtained despite the displacement of the obturation walls side 11, inevitable during casting.
  • Each longitudinal wall 41 of the cowling comprises two conduits 45, 46 parallel to each other and extending in the immediate vicinity of the cylinder wall and on the full width of these.
  • Each of these conduits opens laterally, through respective orifices 47, 48 made in the form of longitudinal slots, at the lower surface 49 of wall 41, opposite the cylinder surface.
  • leak-proofing means are provided load, formed for example simply by a part 50 from the wall, projecting towards the cylinder with respect to to the said conduits. This projecting part is shaped so as to create a significant pressure drop for gases brought between the wall and the surface of the cylinder.
  • the slots 47, 48 open out in a direction inclined to the surface of the cylinders, the inclination of the slots 47 of the duct 45 located most upstream with respect to the direction of rotation of cylinder 1 being directed towards the outside of the cowling, so that a flow of gas leaving these slots is directed almost exclusively towards the outside, while the slots 48 of the duct 46, located downstream, are preferably directed towards casting space. So when an inert gas under pressure is introduced into conduit 45, it is directed through the slots 47, towards the surface of the cylinder 1, and at against the direction of rotation thereof, to oppose the penetration of outside air into the space of casting.
  • a brush 51 is located against the outside of the wall 41 to limit the amount of air supplied under the longitudinal wall due to the rotation of the cylinders, and in particular protect said wall from currents rising hot air generated by the rotation.
  • blowing means 52 are still arranged upstream of the brush 51, to direct a gas jet towards the surface of cylinder 1, also against the direction of rotation of this last.
  • the duct 45 and the slots 47 make it possible to bring to the interface between the longitudinal wall 41 of the cowling 4 and the cylinder a flow of gas directed outward from the rollover, and which, in combination with the means of blowing 52 and the brush 51, opposes the passage of the air, entrained with the cylinder in rotation, towards the casting space, while the duct 46 allows to bring gas directly against the surface of the cylinder inerting or a gas mixture of characteristics predetermined, which can be adapted according to the casting conditions, and the short distance between the protruding part 50 and the surface of the cylinder creating a sufficient pressure drop in zone 22 between the two conduits to ensure between them the best sealing possible.
  • the longitudinal walls 41 are surmounted a frame 53 to which they are linked, this frame being also internally coated with a refractory of thermal protection 54.
  • the support means 10 of the cowling are fixed on this frame and rest by through cylinders 55 on sleepers 56 of the framework of the installation. Sleepers 56 carry also windbreak systems 57 comprising a lip 58 arranged as close as possible to the surface of the cylinders but contactless, these windbreakers are designed to protect the longitudinal walls 41 of the hot air currents which envelop the cylinders during casting.
  • a heat shield 59 consisting of a plate of refractory material extending substantially horizontally and connecting the said elements 42, an orifice 60 being provided in this plate for the passage of the nozzle 7.
  • the frame 53 is surmounted by the cover 43, which is connected to drawer 8 of the distributor by a sealing means having a certain flexibility and having a height adjustable, such as bellows 61.
  • the cover can also include various accessories such as porthole 62, or supports for measuring instruments metal level in the pouring space, etc.
  • Non-contact distance measuring sensors 63 of known type, for example capacitive sensors, are placed on the longitudinal walls 41, near the cylinders, to continuously measure the distance of said walls 41 with respect to the surface of the cylinders, and order the jacks 55 to maintain this distance constant. These sensors could be replaced by any other means allowing the enslavement of the position of the rollover relative to the position of the surface of the cylinders in the area adjacent to the conduits 45, 46.
  • the conduits 45 and 46 preferably comprise a porous material allowing to homogenize the distribution of the gas supplied in these conduits over their entire length.
  • tubes 72, 73 made of such a porous material are placed for this purpose respectively in conduits 45, 46, the gas being brought inside these tubes and dividing from homogeneously along the length of the conduits during its passage through said porous material.
  • FIG. 4 represents this wall in section at enlarged scale.
  • the gas supplied in line 45 located most upstream with respect to the direction of rotation of the cylinder, escapes from this conduit through the orifices 47 by creating a laminar gas flow (arrows F1) against the direction of rotation of the cylinder (arrow F) which constitutes a barrier for the film of air driven by the rotation of the cylinder 2.
  • the two gas streams (F1, F2) are, at the interface between the wall 41 and the surface of the cylinder, separated by a practically stationary gas partition retained in zone 22 by the baffles formed by the grooves 64 made on the lower surface of the wall 41, between the two conduits 45, 46, and parallel to these.
  • this partition gas generating a pressure drop between outlets of the conduits at the lower surface 49 of the wall 41, can only have its effect if the distance between this surface 49 and the cylinder wall is sufficiently weak, which requires power keep this short distance during casting, despite the expansion deformations of the cylinder, in acting on the height positioning jacks 55 of the rollover.
  • the distance j1 between the cylinder and the lower surface 49 of the wall 41, in upstream of the duct 45 is preferably lower or equal to 2 mm, the corresponding distance j2, downstream of the duct 46 is less than or equal to 2.5 mm, and the distance j3, at zone 22, is less than or equal to 1.5 mm.
  • the inerting gas stream from line 46 has two other main effects, which will be specified below.
  • the flow of gas which enters the casting space is divided into a flow Q 1 which remains in the boundary layer attached to the cylinder, penetrates between the surface of the cylinder and the cast metal and therefore intervenes in the heat exchange between the latter, and a flow rate Q 2 which passes over the surface of the bath of cast metal and ensures its inerting.
  • a third flow Q 3 escapes towards the upper part of the cowling, through orifices 65 made for this purpose in the refractory lining 42 and / or the heat shield 59, to prevent too much flow from reaching the meniscus of cast metal, which could lead to gas saturation of the said metal and cause it to cool.
  • the device includes adjustment and control means placed on circuits independent supply of conduits 45, 46, shown in the drawing in Figure 5.
  • a first supply circuit 81 is connected on the conduits 45 of the two walls 41, and a second similar circuit 82 simultaneously supplies the conduits 46.
  • Each circuit includes a mixing chamber 83 connected to supply networks of different gases inerting (eg argon, nitrogen, etc.) by valves 84 adjustable to adjust the composition of the mixture formed in the room, and a distribution circuit comprising successively: an all-or-nothing valve controlled from distance 85, a pressure gauge 86 and a thermometer 87, a gas heater 88, a second set of pressure gauges 89 and thermometer 90, a flow meter 91, a regulator 92 to adjust the pressure of the gas or gas mixture in the conduits 45, and a pressure gauge 93.
  • gases inerting eg argon, nitrogen, etc.
  • the two circuits 81 and 82 can be completed by a third similar direct injection circuit of inerting gas in the cowling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Moulding By Coating Moulds (AREA)
  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
EP95402514A 1994-11-30 1995-11-10 Dispositif de coulée continue entre cylindres a capotage d'inertage Expired - Lifetime EP0714716B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9414571 1994-11-30
FR9414571A FR2727338A1 (fr) 1994-11-30 1994-11-30 Dispositif de coulee continue entre cylindres a capotage d'inertage

Publications (2)

Publication Number Publication Date
EP0714716A1 EP0714716A1 (fr) 1996-06-05
EP0714716B1 true EP0714716B1 (fr) 1998-07-29

Family

ID=9469460

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95402514A Expired - Lifetime EP0714716B1 (fr) 1994-11-30 1995-11-10 Dispositif de coulée continue entre cylindres a capotage d'inertage

Country Status (22)

Country Link
US (1) US5660224A (fi)
EP (1) EP0714716B1 (fi)
JP (1) JP3545119B2 (fi)
KR (1) KR100358890B1 (fi)
CN (1) CN1051034C (fi)
AT (1) ATE168911T1 (fi)
AU (1) AU686031B2 (fi)
BR (1) BR9505591A (fi)
CA (1) CA2163825C (fi)
CZ (1) CZ285194B6 (fi)
DE (1) DE69503742T2 (fi)
DK (1) DK0714716T3 (fi)
ES (1) ES2119338T3 (fi)
FI (1) FI110071B (fi)
FR (1) FR2727338A1 (fi)
PL (1) PL178547B1 (fi)
RO (1) RO116712B1 (fi)
RU (1) RU2150348C1 (fi)
SK (1) SK281882B6 (fi)
TR (1) TR199501516A1 (fi)
TW (1) TW301618B (fi)
ZA (1) ZA959872B (fi)

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Publication number Priority date Publication date Assignee Title
FR2732627B1 (fr) * 1995-04-07 1997-04-30 Usinor Sacilor Procede et dispositif de reglage du bombe des cylindres d'une installation de coulee de bandes metalliques
FR2746333B1 (fr) 1996-03-22 1998-04-24 Usinor Sacilor Procede de coulee continue d'une bande d'acier inoxydable austenitique sur une ou entre deux parois mobiles dont les surfaces sont pourvues de fossettes, et installation de coulee pour sa mise en oeuvre
IT1290929B1 (it) * 1997-02-14 1998-12-14 Voest Alpine Ind Anlagen Procedimento e dispositivo per impedire il contatto di ossigeno con una massa metallica fusa.
IT1290932B1 (it) * 1997-02-14 1998-12-14 Voest Alpine Ind Anlagen Procedimento e dispositivo per impedire il contatto di ossigeno con una massa metallica fusa.
FR2762534B1 (fr) * 1997-04-29 1999-05-28 Usinor Installation de coulee continue de bandes metalliques entre deux cylindres
AT408198B (de) 1998-03-25 2001-09-25 Voest Alpine Ind Anlagen Verfahren zum stranggiessen eines dünnen bandes sowie vorrichtung zur durchführung des verfahrens
CN1063688C (zh) * 1998-08-28 2001-03-28 重庆钢铁(集团)有限责任公司 双辊薄带坯连铸机
CH691576A5 (de) * 1999-09-24 2001-08-31 Main Man Inspiration Ag Bandgiessmaschine zur Erzeugung eines Metallbandes.
KR100419627B1 (ko) * 1999-12-10 2004-02-25 주식회사 포스코 쌍롤형 박판주조기의 흄 배출장치
JP4542247B2 (ja) 2000-08-08 2010-09-08 キャストリップ・リミテッド・ライアビリティ・カンパニー ストリップ連続鋳造装置及びその使用方法
CN1247348C (zh) * 2000-09-19 2006-03-29 主要管理灵感有限公司 制造金属带的带材连铸机
CH692184A5 (de) * 2000-12-30 2002-03-15 Main Man Inspiration Ag Verfahren zum Betreiben einer Bandgiessmaschine sowie ein Mantelring für eine Giessrolle zur Durchführung des Verfahrens.
JP4610787B2 (ja) * 2001-05-18 2011-01-12 三菱重工業株式会社 双ドラム式連続鋳造装置
KR100766264B1 (ko) * 2001-12-17 2007-10-15 주식회사 포스코 연속 주조 공정의 2차 냉각대에서 주편 코너부의 완냉각방법
KR100544578B1 (ko) * 2001-12-21 2006-01-24 주식회사 포스코 쌍롤식 박판주조기에서 롤표면 오염과 주편에지부 미응고방지장치
KR100584751B1 (ko) * 2001-12-22 2006-05-30 주식회사 포스코 쌍롤식 박판주조기의 주조롤표면 가스층두께 조절장치
JP4165147B2 (ja) * 2002-08-12 2008-10-15 株式会社Ｉｈｉ 双ロール鋳造機
US8196641B2 (en) * 2004-11-16 2012-06-12 Rti International Metals, Inc. Continuous casting sealing method
US7891407B2 (en) 2004-12-13 2011-02-22 Nucor Corporation Method and apparatus for localized control of heat flux in thin cast strip
US20060124271A1 (en) 2004-12-13 2006-06-15 Mark Schlichting Method of controlling the formation of crocodile skin surface roughness on thin cast strip
US8312917B2 (en) 2004-12-13 2012-11-20 Nucor Corporation Method and apparatus for controlling the formation of crocodile skin surface roughness on thin cast strip
CN100434207C (zh) * 2006-07-21 2008-11-19 江苏兴利来特钢有限公司 薄板坯的连铸装置
KR100779573B1 (ko) * 2006-07-24 2007-11-29 주식회사 포스코 쌍롤식 연속 박판주조장치의 용강공급노즐 지지장치
US7888158B1 (en) * 2009-07-21 2011-02-15 Sears Jr James B System and method for making a photovoltaic unit
JP5977173B2 (ja) 2009-12-22 2016-08-24 スリーエム イノベイティブ プロパティズ カンパニー 基材上に流体を衝突させるための装置及び方法
CN102069164B (zh) * 2010-11-24 2013-05-01 浙江海亮股份有限公司 水平连铸管坯熔铸加工内外表面保护装置及其操作方法
US9126224B2 (en) 2011-02-17 2015-09-08 3M Innovative Properties Company Apparatus and methods for impinging fluids on substrates
RU2726543C1 (ru) * 2016-12-26 2020-07-14 Баошань Айрон Энд Стил Ко., Лтд. Удерживающее устройство боковой перегородки для непрерывного литья тонкой полосы с двумя валками и способ его установки
RU187633U1 (ru) * 2018-06-26 2019-03-14 Публичное акционерное общество "Северсталь" Устройство для защиты струи металла при непрерывной разливке сортовой заготовки сечением до 150 мм
CN113757382B (zh) * 2021-09-09 2022-04-01 广东嘉元科技股份有限公司 一种阴极辊专用在线防氧化装置

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US5103895A (en) * 1989-07-20 1992-04-14 Nippon Steel Corporation Method and apparatus of continuously casting a metal sheet
WO1993022087A1 (en) * 1992-04-24 1993-11-11 Ishikawajima-Harmia Heavy Industries Company Limited Vapor extraction in continuous strip casting
AU4294493A (en) * 1992-07-21 1994-02-14 Bhp Steel (Jla) Pty Limited Strip caster

Also Published As

Publication number Publication date
CA2163825C (fr) 2005-06-21
ATE168911T1 (de) 1998-08-15
SK147895A3 (en) 1996-08-07
TR199501516A1 (tr) 1996-10-21
ES2119338T3 (es) 1998-10-01
CZ315995A3 (en) 1996-07-17
RO116712B1 (ro) 2001-05-30
CZ285194B6 (cs) 1999-06-16
KR960017007A (ko) 1996-06-17
BR9505591A (pt) 1997-11-04
JPH08206793A (ja) 1996-08-13
EP0714716A1 (fr) 1996-06-05
JP3545119B2 (ja) 2004-07-21
PL178547B1 (pl) 2000-05-31
FI110071B (fi) 2002-11-29
RU2150348C1 (ru) 2000-06-10
DE69503742D1 (de) 1998-09-03
AU686031B2 (en) 1998-01-29
KR100358890B1 (ko) 2003-02-26
DE69503742T2 (de) 1999-03-11
CA2163825A1 (fr) 1996-05-31
AU3914995A (en) 1996-06-06
CN1130112A (zh) 1996-09-04
PL311512A1 (en) 1996-06-10
FI955748A0 (fi) 1995-11-29
DK0714716T3 (da) 1999-05-03
CN1051034C (zh) 2000-04-05
FI955748A (fi) 1996-05-31
FR2727338A1 (fr) 1996-05-31
ZA959872B (en) 1996-06-04
TW301618B (fi) 1997-04-01
SK281882B6 (sk) 2001-08-06
FR2727338B1 (fi) 1997-02-14
US5660224A (en) 1997-08-26

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