EP0677345A1 - Verfahren und Vorrichtung zum Stranggiessen mit Doppelrollen - Google Patents

Verfahren und Vorrichtung zum Stranggiessen mit Doppelrollen Download PDF

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Publication number
EP0677345A1
EP0677345A1 EP95400446A EP95400446A EP0677345A1 EP 0677345 A1 EP0677345 A1 EP 0677345A1 EP 95400446 A EP95400446 A EP 95400446A EP 95400446 A EP95400446 A EP 95400446A EP 0677345 A1 EP0677345 A1 EP 0677345A1
Authority
EP
European Patent Office
Prior art keywords
cylinders
lubricant
interface
wall
closure wall
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
EP95400446A
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English (en)
French (fr)
Other versions
EP0677345B1 (de
Inventor
Christophe Ganser
Jacques Barbe
Jean-Michel Damasse
Jean-Marie Pelletier
Pascal Devaux
Luc Vendeville
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.)
Usinor En Thyssen Stahl AG
Original Assignee
Thyssen Stahl AG
USINOR Sacilor 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.)
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Publication date
Application filed by Thyssen Stahl AG, USINOR Sacilor SA filed Critical Thyssen Stahl AG
Publication of EP0677345A1 publication Critical patent/EP0677345A1/de
Application granted granted Critical
Publication of EP0677345B1 publication Critical patent/EP0677345B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B22D11/06—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
    • B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
    • B22D11/0668—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating for dressing, coating or lubricating

Definitions

  • the present invention relates to the continuous casting of thin metallic products, in particular steel, according to the continuous casting technique between two counter-rotating cylinders, and more particularly the management of contact and lubrication between the front ends of such cylinders and the walls. lateral closure, applied against these front ends, to delimit the casting space defined between the cylinders.
  • Known installations for continuous casting between cylinders comprise two cylinders with horizontal and parallel axes, internally cooled, rotated in opposite directions, and spaced from each other by a distance corresponding to the desired thickness of the cast product. .
  • the molten metal is poured into the casting space, defined between the cylinders, solidifies on contact with them, and is extracted downwards, during their rotation in the form of a thin strip.
  • lateral sealing walls are pressed against the front ends of the cylinders.
  • Such lateral closure walls are commonly made of refractory material, at least in their part brought into contact with the molten metal.
  • a known method of lubrication consists in depositing a lubricating material on the front surfaces of the cylinders. This deposit is for example carried out by applying to these surfaces a solid rod of a lubricant, comprising for example boron nitride or graphite.
  • the regularity of the contact can also be destroyed, during casting, by metal infiltrations or tearing of the refractory material from the obturation walls, in the contact zone.
  • a problem which remains is that if metal infiltrations cling to the edges of the cylinders or to the obturation walls, or if these hollow out locally following tearing of their constituent materials, or simply following their wear, closure wall - cylinder contact is not regular over the entire length of the contact arc, which affects sealing and may cause further infiltration.
  • the present invention aims to solve these problems, and aims in particular to ensure perfect sealing between cylinders and lateral closure walls permanently during casting by managing the wear of said closure walls.
  • the invention relates to a process for the continuous casting of metals between cylinders, according to which molten metal is poured into a casting space defined by the cylindrical walls of two cylinders with parallel axes, counter-rotating and internally cooled, and two fixed lateral closure walls placed against the front end surfaces of the cylinders, and a lubricant is deposited on these front surfaces to lubricate the cylinder-closure wall interfaces, and the solidified product is extracted in an extraction direction substantially perpendicular to the plane containing the axes of the cylinders, characterized in that the quantity of lubricant supplied to each of these interfaces, either periodically or in the event of deterioration of the friction or sealing conditions at the cylinder-closure wall interface.
  • the same erosion mechanism intended to correct the harmful effects of metal infiltrations and snagging, or of refractory tearing, is used in the case where the reduction or removal of lubricant is controlled in response to a measured variation d '' a parameter representative of the friction or sealing conditions at the cylinder - closure wall interface.
  • the quantity of lubricant deposited is varied as a function of the force exerted on the closure wall in the direction of extraction.
  • variations in the force measured are representative of variations in the friction conditions of the cylinders on the closure wall considered, these variations in friction being themselves indicative of a disturbance (infiltration, attachment or tearing) to the interface.
  • the quantity of lubricant deposited is varied as a function of the position of the closure wall relative to the front surfaces of the cylinders, measured in the direction of the axes of the cylinders.
  • the displacement of the closure wall is indicative of an attachment of infiltrated metal between said wall and the cylinder, this attachment having the effect of moving the closure wall away from the front surface of the cylinder.
  • the quantity of lubricant deposited is varied as a function of parameters characteristic of the vibrations induced in the closure wall during casting.
  • variations in the vibration regime of the closure wall are indicative of variations in the friction conditions, themselves indicative of disturbances at the interface.
  • the bearing force of a solid stick of lubricant applied to each of the front faces of the cylinders is varied.
  • a stick of lubricant is applied permanently and with a substantially constant force to each of the front faces of the cylinders, and to reduce the quantity of lubricant supplied to the interface, the lubricant deposited is removed by means of a scraper or brush.
  • This method has the advantage of obtaining a faster effect of the reduction or elimination of lubricant, because it effectively removes the lubricant located on the front surface of the cylinder, as soon as the scraper and / or the brush are put into service, while the first method can leave lubricant on the front surface of the cylinder for several turns of the latter before the consumption of lubricant, which occurs naturally in operation, leads to its effective reduction or elimination.
  • the invention also relates to a continuous casting device between cylinders, comprising two counter-rotating cylinders with parallel axes, defining between them a casting space, delimited by two lateral closure walls, fixed and placed against the front surfaces of end of the cylinders, means for depositing a lubricant on said front surfaces, means for measuring one or more parameters representative of the friction or sealing conditions at the cylinder-closure wall interface, characterized in that 'It includes means for reducing the quantity of lubricant supplied to said interface when the value or values of this or these parameters indicate a degradation of said friction or sealing conditions.
  • the adjustment means comprise a scraper or a brush associated with each of the front surfaces, and means for switching the scraper or the brush on or off to remove the lubricant present on said front surfaces.
  • the installation for continuous casting of thin strips of steel shown diagrammatically in the drawing in FIG. 1, comprises two casting rolls 1, 2, of horizontal and parallel axes, spaced by a distance corresponding to the thickness of the bandaged.
  • the molten metal is poured into the casting space 3 defined between the cylinders 1,2. These are internally cooled and rotated in opposite directions, so that, during casting, the steel strip is pulled down, in the direction indicated by arrow F.
  • the pouring space is delimited by fixed walls 4 for lateral closure, applied against the front surfaces 5 of the cylinders by pressure means 20, such as springs or jacks, in a manner known per se.
  • the walls 4 have, on the side of the casting space, a central part 6 of refractory material, preferably thermally insulating, bordered by two strips 7 which extend, according to a curvature corresponding to that of the cylinders, over the entire height of the wall 4.
  • These bands 7, also called inserts, are made of a refractory material having good qualities of resistance to abrasion wear.
  • the external radius of curvature of these bands 7 is slightly greater than the external radius of the cylinders, so that a part 7 ′ of the bands 7 projects beyond the periphery of the cylinders and is, during casting, in contact with the cast metal. Therefore, it is therefore the remaining part 7 '' of each strip 7 which is in rubbing contact with the corresponding front face of each cylinder, to ensure the sealing of the casting space.
  • the installation comprises means 8 for depositing a lubricant on the front surfaces 5, shown diagrammatically in FIG. 1, and shown in more detail in FIG. 7, in a preferred embodiment.
  • These means comprise, for each front face of the cylinders, a solid rod of lubricant 9, such as for example boron nitride or graphite, guided in a tubular support 10 fixed on the structure 11 of the installation.
  • the rod 9 is pushed against the front surface 5 of the cylinder 1 by a pressure means such as a spring 12, or a jack.
  • the spring 12 presses the lubricating stick 9 on the front surface 5, permanently and with a substantially constant force throughout the casting.
  • lubricant is therefore deposited and distributed over the entire circumferential part of the front surface 5 of the cylinder 1, and can be brought by this rotation, to the contact interface between this surface and the part 7 '' of the insert 7 of the closure wall 4, to ensure lubrication.
  • the installation also includes means for adjusting the quantity of lubricant supplied to the interface, comprising, associated with each front surface 5 of the cylinders, a scraping system 13 and a rotary brush 14, driven in rotation by a motor 15.
  • the scraping system shown in more detail in FIG. 8, comprises a blade-shaped scraper 16 which can be applied in contact with the front surface 5, or distant from it, by a jack 17, or a means of equivalent movement control.
  • the brush 14 can, similarly, be applied with a controlled force against the front surface 5, or be removed from it, by equivalent displacement means, not shown.
  • the installation also includes means 18 for measuring the position in the axial direction of the cylinders, for the closure wall 4, with respect to the front surface 5.
  • These measurement means make it possible to determine the variations in position of the wall shutter, and therefore give information on the operating conditions of the installation at the level of the cylinder - shutter wall interface, in particular on the sealing of the casting space at this interface. For example, when cast metal infiltrates between the cylinder and the obturation wall and forms a solidification 21 which adheres to the obturation wall 4, the presence of this attachment pushes the wall against the force exerted by the pressure means 20, creating a clearance at the interface, detrimental to the seal, and detectable by the displacement measurement means 18.
  • FIG. 6 a casting process according to the invention, making it possible to manage the wear of the closure wall during of casting.
  • the plot 30 of Figure 6 shows the position of the closure wall 4, relative to the general structure of the installation, as a function of time.
  • Part 31 of line 30 corresponds to the start of casting, during which a progressive displacement of the closure wall 4 is observed, the result of relatively rapid wear of the refractory material constituting the insert 7. This period corresponds to a lapping of the insert by friction of the cylinder during its rotation, until the two surfaces are in intimate contact which ensures a good seal.
  • the friction and sealing conditions at the interface stabilize, the lubrication being ensured by the regular supply of lubricant resulting from the deposit made by friction of the lubricant stick 8 on the front surface 5 of the cylinder.
  • the lubricant becomes embedded in the roughness hollows of this surface, this roughness being of the order of 5 to 20 ⁇ m.
  • the wear regime of the closure wall is then stabilized at very slow wear; and the closing wall practically does not undergo any more displacement (part 32 of the layout).
  • the temporary reduction or elimination of lubrication of the interface can also be carried out by eliminating the application of the stick 9 on the front surface of the cylinder.
  • the invention makes it possible in particular to avoid using for the inserts a material of the self-lubricating type, for example with a high content of boron nitride, a less resistant and more expensive material, by ensuring the lubrication of the cylinder-wall interface. sealing via the front surfaces of the cylinders, instead of ensuring this lubrication by the inserts themselves.
  • the invention is not limited to the device method described above by way of example.
  • the deposition of lubricant on the front surfaces of the cylinders can also be carried out by other means than the rods described above, for example by systems for applying liquid or pasty lubricant, spraying liquid or pulverulent lubricant, etc.
  • the relative provision of the means of lubrication 8, brush 14, closure wall 4 and scraper 13, shown in FIG. 1 in this order according to the direction of rotation of the cylinders can be modified; the lubrication means 8 being able in particular to be placed between the brush and the closure wall, the effect of brushing being then still remarkable because the lubricant deposited after brushing is in a reduced quantity compared to what would occur without no brushing.
  • scrapers which, being placed downstream of the obturation wall in the direction of rotation, also ensure the elimination of possible metal snagging on the edges of the cylinders, can also be placed upstream, but after the means of lubrication, and in addition to or instead of brushes.
  • means other than the displacement measurement means described above can be used to measure parameters representative of the friction or sealing conditions at the cylinder - closure wall interface.
  • a load cell 19 placed under said closure wall.
  • the load cell 19 therefore serves to measure the force exerted on the wall 4 resulting from the friction of the cylinders 1, 2 in rotation on this wall, this force depending on the friction conditions and therefore in particular the force of application of the wall 4 on the cylinders, in the direction of the two axes, of the effective contact surface, and of the lubrication conditions.
  • Variations in the measured force are representative of modifications of the friction conditions at the interface, which can be caused either by abnormal localized wear of the wall. shutter, or tearing of its material, or also infiltration of cast metal and metal snagging on said wall.
  • each closure wall 4 It is also possible to measure the force exerted downwards on each closure wall 4 by two force sensors disposed respectively on the sides of the wall. This arrangement makes it possible to know, in addition to the total force, the forces caused by the friction of each cylinder on said wall, independently of one another, and thus to better appreciate at which cylinder-wall interface occurs the degradation of the friction and sealing conditions, and therefore of being able to act predominantly at the level of the interface concerned.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP95400446A 1994-03-15 1995-03-02 Verfahren und Vorrichtung zum Stranggiessen mit Doppelrollen Expired - Lifetime EP0677345B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9403164 1994-03-15
FR9403164A FR2717410B1 (fr) 1994-03-15 1994-03-15 Procédé et dispositif de coulée continue entre cylindres.

Publications (2)

Publication Number Publication Date
EP0677345A1 true EP0677345A1 (de) 1995-10-18
EP0677345B1 EP0677345B1 (de) 1998-01-14

Family

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EP95400446A Expired - Lifetime EP0677345B1 (de) 1994-03-15 1995-03-02 Verfahren und Vorrichtung zum Stranggiessen mit Doppelrollen

Country Status (7)

Country Link
EP (1) EP0677345B1 (de)
AT (1) ATE162123T1 (de)
DE (1) DE69501416T2 (de)
DK (1) DK0677345T3 (de)
ES (1) ES2114279T3 (de)
FR (1) FR2717410B1 (de)
GR (1) GR3026372T3 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999032246A1 (en) * 1997-12-20 1999-07-01 Pohang Iron & Steel Co., Ltd. Apparatus for lubricating edge dam in twin-roll type strip casting machine, and method therefor
WO2005002757A1 (de) * 2003-07-01 2005-01-13 Sms Demag Aktiengesellschaft Verfahren zum betrieb einer bandgiessmaschine für die erzeugung eines metallbandes
WO2005025776A1 (de) * 2003-09-08 2005-03-24 Thyssenkrupp Nirosta Gmbh Seitenplatte zum abdichten eines zwischen den giesswalzen einer zweiwalzengiessvorrichtung gebildeten giessspalts, zweiwalzengiessvorrichtung und verfahren zu ihrem betrieb
KR100801587B1 (ko) * 2000-06-23 2008-02-05 영신제약산업 주식회사 프로테아제-활성 수용체에 의해 유도되는 세포 활성과관련된 장애를 치료하는 방법

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9505206D0 (en) * 1995-03-15 1995-05-03 Thor Ceramics Ltd Refractory systems
CN105562639B (zh) * 2016-02-26 2018-10-02 宝山钢铁股份有限公司 一种薄带连铸侧封板长寿命使用方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6326242A (ja) * 1986-07-17 1988-02-03 Nippon Yakin Kogyo Co Ltd 金属薄板帯の直接鋳造装置
JPS63248547A (ja) * 1987-04-01 1988-10-14 Kawasaki Steel Corp 急冷金属薄帯の製造方法
FR2642345A1 (fr) * 1989-01-31 1990-08-03 Hitachi Shipbuilding Eng Co Procede et dispositif pour retenir de facon etanche un metal fondu dans un dispositif de coulee continue du type a cylindres jumeles
JPH0481250A (ja) * 1990-07-21 1992-03-13 Nippon Steel Corp 薄板連続鋳造機のサイド堰潤滑方法
JPH0615416A (ja) * 1991-11-20 1994-01-25 Nippon Steel Corp 双ロール連続鋳造方法および装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6326242A (ja) * 1986-07-17 1988-02-03 Nippon Yakin Kogyo Co Ltd 金属薄板帯の直接鋳造装置
JPS63248547A (ja) * 1987-04-01 1988-10-14 Kawasaki Steel Corp 急冷金属薄帯の製造方法
FR2642345A1 (fr) * 1989-01-31 1990-08-03 Hitachi Shipbuilding Eng Co Procede et dispositif pour retenir de facon etanche un metal fondu dans un dispositif de coulee continue du type a cylindres jumeles
JPH0481250A (ja) * 1990-07-21 1992-03-13 Nippon Steel Corp 薄板連続鋳造機のサイド堰潤滑方法
JPH0615416A (ja) * 1991-11-20 1994-01-25 Nippon Steel Corp 双ロール連続鋳造方法および装置

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 12, no. 229 (M - 714)<3076> 29 June 1988 (1988-06-29) *
PATENT ABSTRACTS OF JAPAN vol. 13, no. 41 (M - 791) 30 January 1989 (1989-01-30) *
PATENT ABSTRACTS OF JAPAN vol. 16, no. 299 (M - 1274) 2 July 1992 (1992-07-02) *
PATENT ABSTRACTS OF JAPAN vol. 18, no. 217 (M - 1594) 19 April 1994 (1994-04-19) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999032246A1 (en) * 1997-12-20 1999-07-01 Pohang Iron & Steel Co., Ltd. Apparatus for lubricating edge dam in twin-roll type strip casting machine, and method therefor
AU725198B2 (en) * 1997-12-20 2000-10-05 Pohang Iron & Steel Co., Ltd. Apparatus for lubricating edge dam in twin-roll type strip casting machine, and method therefor
US6202792B1 (en) 1997-12-20 2001-03-20 Pohang Iron & Steel Co., Ltd. Apparatus for lubricating edge dam in twin-roll type strip casting machine, and method therefor
CN1077819C (zh) * 1997-12-20 2002-01-16 浦项综合制铁株式会社 用来润滑双辊式带材连铸机中的边部挡板的装置及其方法
KR100801587B1 (ko) * 2000-06-23 2008-02-05 영신제약산업 주식회사 프로테아제-활성 수용체에 의해 유도되는 세포 활성과관련된 장애를 치료하는 방법
WO2005002757A1 (de) * 2003-07-01 2005-01-13 Sms Demag Aktiengesellschaft Verfahren zum betrieb einer bandgiessmaschine für die erzeugung eines metallbandes
CN100366364C (zh) * 2003-07-01 2008-02-06 Sms迪马格股份公司 用于使生产一条金属带用的带浇铸机运行的方法
US7337827B2 (en) 2003-07-01 2008-03-04 Sms Demag Ag Method for operating a strip casting machine for producing a metal strip
WO2005025776A1 (de) * 2003-09-08 2005-03-24 Thyssenkrupp Nirosta Gmbh Seitenplatte zum abdichten eines zwischen den giesswalzen einer zweiwalzengiessvorrichtung gebildeten giessspalts, zweiwalzengiessvorrichtung und verfahren zu ihrem betrieb

Also Published As

Publication number Publication date
DE69501416D1 (de) 1998-02-19
ATE162123T1 (de) 1998-01-15
FR2717410B1 (fr) 1996-06-07
GR3026372T3 (en) 1998-06-30
DE69501416T2 (de) 1998-07-30
ES2114279T3 (es) 1998-05-16
FR2717410A1 (fr) 1995-09-22
EP0677345B1 (de) 1998-01-14
DK0677345T3 (da) 1998-09-14

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