EP0677345B1 - Verfahren und Vorrichtung zum Stranggiessen mit Doppelrollen - Google Patents

Verfahren und Vorrichtung zum Stranggiessen mit Doppelrollen Download PDF

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Publication number
EP0677345B1
EP0677345B1 EP95400446A EP95400446A EP0677345B1 EP 0677345 B1 EP0677345 B1 EP 0677345B1 EP 95400446 A EP95400446 A EP 95400446A EP 95400446 A EP95400446 A EP 95400446A EP 0677345 B1 EP0677345 B1 EP 0677345B1
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EP
European Patent Office
Prior art keywords
lubricant
rolls
wall
closure
interface
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
EP95400446A
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English (en)
French (fr)
Other versions
EP0677345A1 (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
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Publication of EP0677345A1 publication Critical patent/EP0677345A1/de
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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 continuous casting thin metal products, especially steel, according to the technique of continuous casting between two cylinders contra-rotating, and more particularly the management of contact and lubrication between the ends fronts of such cylinders and shutter walls lateral, applied against these frontal ends, to delimit the casting space defined between the cylinders.
  • the molten metal is spilled in the casting space, defined between the cylinders, is solidifies on contact with them, and is extracted towards the bottom, when rotated, in the form of a thin strip.
  • sealing walls side are pressed against the front ends cylinders.
  • Such lateral closure walls are commonly made of refractory material, at less in their part brought into contact with the molten metal.
  • a way known lubrication consists in depositing a material lubricant on the front surfaces of the cylinders. This deposit is for example (see document JP-A-63248547) produced by applying a solid bar to these surfaces a lubricant, for example comprising nitride of boron or graphite. Document JP-A-6015416 teaches achieve this deposition by spraying a material lubricant, the thickness of which is controlled by a adapted device.
  • the regularity of contact can also be destroyed, during casting, by metal infiltration or tearing of the refractory material from the walls shutter, in the contact area.
  • the object of the present invention is to resolve these problems, and is particularly aimed at ensuring perfect seal between cylinders and walls lateral shutters permanently during casting in managing the wear of said closure walls.
  • the object of the invention is a process for the continuous casting of metals between cylinders, that molten metal is poured into a space of casting defined by the cylindrical walls of two cylinders with parallel axes, counter-rotating and cooled internally, and two fixed shutter walls side placed against the front surfaces end of the cylinders, and we deposit on these surfaces a lubricant to lubricate the interfaces cylinders-shutter walls, and we extract the product solidified in a direction of extraction substantially perpendicular to the plane containing the axes of the cylinders, characterized in that the quantity of lubricant is reduced brought into each of these interfaces be periodically, either in the event of deterioration in conditions friction or sealing at the cylinder-wall interface shutter.
  • the amount of lubricant deposited depending on the effort exerted on the shutter wall in the direction extraction.
  • variations in effort measured are representative of variations in conditions friction of the cylinders on the closing wall considered, these variations in friction being themselves indicators of a disturbance (infiltration, hooking or tearing) at the interface.
  • moving the shutter wall is indicative of metal snagging infiltrated between said wall and the cylinder, this attachment having the effect of moving the wall away the front surface of the cylinder.
  • the variation is varied. quantity of lubricant deposited according to parameters characteristics of the vibrations induced in the wall shutter during casting. As in the first variant above, variations in the vibration regime of the obturation wall are indicative of variations friction conditions, themselves indicative of interface disturbances.
  • a preferential method one applies in permanently and with a substantially constant effort on each of the front faces of the cylinders, a stick of lubricant, and to reduce the amount of lubricant brought to the interface, we remove the lubricant deposited at the by means of a scraper or a brush.
  • This method presents the advantage of obtaining a faster effect of the reduction or removing lubricant because it removes actually the lubricant on the surface front of the cylinder, as soon as the scraper and / or the brush are put into service, whereas the first method can let lubricant remain on the front surface of the cylinder for several turns of it before the consumption of lubricant, which occurs naturally in operation, does not lead to its reduction or effective deletion.
  • the invention also relates to a device for continuous casting between cylinders, comprising two cylinders contra-rotating parallel axes, defining between them a pouring space, delimited by two sealing walls lateral, fixed and placed against the front surfaces end of the cylinders, means for depositing a lubricant on said front surfaces, means of measurement of one or more parameters representative of friction or sealing conditions at the interface cylinder-shutter wall, characterized in that it includes means for removing the lubricant present on said front surfaces when the value (s) of this or these parameters indicate a degradation of the said friction or sealing conditions, said means including a scraper or a brush associated with each front surfaces, and means of commissioning or out of service of the scraper or brush.
  • Installation of continuous casting of thin strips steel shown schematically in the drawing of the Figure 1, includes two casting rolls 1, 2, of axes horizontal and parallel, spaced apart by a distance corresponding to the thickness of the strip.
  • the metal in fusion 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 extracted down, in the direction indicated by the arrow F.
  • the pouring space is delimited by fixed walls 4 lateral shutters, applied against surfaces front 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 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 Ray of outer curvature of these bands 7 is slightly greater than the outer radius of the cylinders, so that a part 7 ′ of the strips 7 projects beyond the periphery cylinders and either, 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, for sealing the pouring space.
  • the installation comprises means 8 for depositing a lubricant on the surfaces front 5, shown diagrammatically in FIG. 1, and shown in more detail in Figure 7, in a preferred embodiment.
  • These means include, for each front face of the cylinders, a stick solid of lubricant 9, such as for example nitride of boron or graphite, guided in a tubular support 10 fixed to the structure 11 of the installation.
  • the stick 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 supports the lubricant stick 9 on the front surface 5, in permanently and with a substantially constant effort 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 '' from the insert 7 of the closure wall 4, to provide lubrication.
  • the installation also includes adjustment means the quantity of lubricant supplied to the interface, comprising, associated with each front surface 5 of the cylinders, a scraping system 13 and a brush rotary 14, driven in rotation by a motor 15.
  • the scraping system shown more detailed in FIG. 8, includes a scraper 16 in blade shape that can be applied in contact with the frontal surface 5, or distant from it, by a jack 17, or an equivalent displacement control means.
  • Brush 14 can similarly be applied with controlled force against the surface frontal 5, or be distant from it, by means of equivalent displacement, not shown.
  • the installation also includes measuring means 18 of the position in the axial direction of the cylinders, of the closure wall 4, with respect to the front surface 5.
  • These measuring means make it possible to determine variations in wall position shutter, and therefore give indications on the operating conditions of the installation at the level the cylinder - end wall interface, in particular on the tightness of the casting space at this level interface. For example, when cast metal seeps between the cylinder and the closing wall and forms in se solidifying a hook 21 adhering to the wall shutter 4, the presence of this attachment repels the wall against the effort exerted by the means of pressure 20, creating a game at the interface, harmful to sealing, and detectable by the measuring means of displacement 18.
  • Line 30 in Figure 6 shows the position of the closure wall 4, with respect to the general structure of the installation, depending on the time.
  • Part 31 of route 30 corresponds to the start of casting, during which we observe a displacement progressive closure wall 4, result of a relatively rapid wear of refractory material constituting the insert 7. This period corresponds to a running-in 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 temporary reduction or removal of interface lubrication can also be performed by a removal of 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 self-lubricating material, for example example with high boron nitride content, less material resistant and more expensive, ensuring the lubrication of the cylinder-shutter interface by through the front surfaces of the cylinders, at instead of ensuring this lubrication by the inserts themselves.
  • a self-lubricating material for example example with high boron nitride content, less material resistant and more expensive
  • the invention is not limited to the device method described above by way of example.
  • the deposit of lubricant on the front surfaces of cylinders can also be achieved by other means as the sticks described above, for example by liquid lubricant application systems or pasty, projection of liquid or powdery 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 depending on the direction of rotation of the cylinders can be modified; the lubrication means 8 being able to particular be placed between the brush and the wall shutter, the effect of brushing then still being remarkable in that the lubricant deposited after brushing is found in reduced quantity compared to this which would happen without any brushing.
  • scrapers which, being placed downstream of the closing wall in the direction of rotation, ensure also the elimination of possible metal snags on the edges of the cylinders, can be placed also upstream, but after the means to lubrication, and in addition to or in place of brushes.
  • the load cell 19 is therefore used to measure the force exerted on the wall 4 resulting from the friction of the cylinders 1, 2 rotating on this wall, this effort depending on the friction conditions and therefore in particular of the application force of the wall 4 on the cylinders, in the direction of two axes, from the surface contact, and lubrication conditions.
  • Variations in the measured effort are representative of changes in the conditions of friction at the interface, which can be caused either by abnormal localized wear of the wall obturation, or tearing of its material, or also seepage of cast metal and snagging of metal on said wall.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (11)

  1. Verfahren zum Stranggießen von dünnen Metallprodukten zwischen Walzen, gemäß dem man schmelzflüssiges Metall in einen Gießraum (3) gießt, der von den zylindrischen Wänden zweier gegenläufiger und im Innern gekühlter Walzen (1, 2) mit parallelen Achsen und von zwei feststehenden seitlichen Verschlußwänden (4) definiert wird, die an den stirnseitigen Endflächen der Walzen angeordnet sind, und man auf diese Stirnflächen (5) ein Schmiermittel zum Schmieren der Grenzflächen Walze-Verschlußwand aufbringt und man das erstarrte Produkt in einer Entnahmerichtung (F) abzieht, die im wesentlichen senkrecht zu der die Achsen der Walzen enthaltenden Ebene ist, dadurch gekennzeichnet, daß man die Menge des in jede dieser Grenzflächen eingebrachten Schmiermittels entweder periodisch oder im Falle einer Verschlechterung der Reibungs- oder Dichtigkeitsverhältnisse an der Grenzfläche Walze-Verschlußwand verringert.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man die Menge des der Grenzfläche zugeführten Schmiermittels gemäß einer vorbestimmten regelmäßigen Periodizität zwischen einem maximalen Wert und einem Wert Null verändert.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man die Menge des aufgebrachten Schmiermittels in Abhängigkeit von der auf die Verschlußwand (4) in der Abzugsrichtung (F) ausgeübten Kraft verändert.
  4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man die Menge des aufgebrachten Schmiermittels in Abhängigkeit von der Position (d) der Verschlußwand (4) in bezug auf die Stirnflächen (5) der Walzen, gemessen in der Richtung der Achsen der Walzen, verändert.
  5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man die Menge des aufgebrachten Schmiermittels in Abhängigkeit von Parametern, die für die beim Guß in der Verschlußwand bewirkten Vibrationen kennzeichnend sind, verändert.
  6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß man zur Regulierung der Menge des der Grenzfläche zugeführten Schmiermittels den Auflagedruck eines festen Schmiermittelstabs (9), der auf jede der Stirnflächen (5) der Walzen gedrückt wird, verändert.
  7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß man zur Regulierung der Menge des der Grenzfläche zugeführten Schmiermittels ständig und mit einer im wesentlichen gleichbleibenden Kraft auf jede der Stirnflächen der Walzen einen Schmiermittelstab (9) drückt und zur Verringerung der Menge des der Grenzfläche zugeführten Schmiermittels das aufgebrachte Schmiermittel mittels eines Abstreifers (13) oder einer Bürste (14) entfernt.
  8. Vorrichtung zum Stranggießen zwischen Walzen, die zwei gegenläufige Walzen (1, 2) mit parallelen Achsen, die zwischen sich einen Gießraum (3) definieren, der von zwei feststehenden seitlichen Verschlußwänden (4) begrenzt wird, die an den stirnseitigen Endflächen (5) der Walzen angeordnet sind, Mittel (8) zum Aufbringen eines Schmiermittels auf diese Stirnflächen und Mittel (18, 19) zur Messung eines oder mehrerer Parameter umfaßt, welche die Reibungs- oder Dichtigkeitsverhältnisse an der Grenzfläche Walze-Verschlußwand repräsentieren, dadurch gekennzeichnet, daß sie Mittel aufweist, um das auf den Stirnflächen vorhandene Schmiermittel zu entfernen, wenn der oder die Werte dieses oder dieser Parameter eine Verschlechterung der Reibungs- oder Dichtigkeitsverhältnisse anzeigen, wobei diese Mittel einen Abstreifer (13) oder eine Bürste (14), der/die jeder der Stirnflächen (5) beigeordnet ist, und Mittel zur Inbetriebsetzung oder Außerbetriebsetzung des Abstreifers oder der Bürste umfassen.
  9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die Meßmittel für jede Verschlußwand einen Kraftaufnehmer (19) umfassen, um die Kraft zu messen, die auf die Verschlußwand in der Richtung, die zu der die Walzenachsen enthaltenden Ebene senkrecht ist, ausgeübt wird.
  10. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die Meßmittel für jede Verschlußwand einen Wegaufnehmer (18) umfassen, um die Verschiebungen der seitlichen Verschlußwand in einer Richtung parallel zu den Achsen der Walzen zu messen.
  11. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die Meßmittel für jede Verschlußwand einen Beschleunigungsmesser umfassen.
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 EP0677345A1 (de) 1995-10-18
EP0677345B1 true EP0677345B1 (de) 1998-01-14

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

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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)

Families Citing this family (6)

* 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
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
KR20050117594A (ko) * 2000-06-23 2005-12-15 주식회사 하이닉스반도체 반도체 소자의 제조 방법
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
DE10341249B4 (de) * 2003-09-08 2005-06-30 Thyssenkrupp Nirosta Gmbh Seitenplatte zum Abdichten eines zwischen den Gießwalzen einer Zweiwalzengießvorrichtung gebildeten Gießspalts, Zweiwalzengießvorrichtung und Verfahren zu ihrem Betrieb
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

Family Cites Families (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
US5027888A (en) * 1989-01-31 1991-07-02 Hitachi Zosen Corporation Method and apparatus for sealing molten metal for a twin-roll type continous casting apparatus
JP2930384B2 (ja) * 1990-07-21 1999-08-03 新日本製鐵株式会社 薄板連続鋳造機のサイド堰潤滑方法
JP2968103B2 (ja) * 1991-11-20 1999-10-25 新日本製鐵株式会社 双ロール連続鋳造方法および装置

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Publication number Publication date
GR3026372T3 (en) 1998-06-30
ATE162123T1 (de) 1998-01-15
EP0677345A1 (de) 1995-10-18
DE69501416D1 (de) 1998-02-19
DK0677345T3 (da) 1998-09-14
ES2114279T3 (es) 1998-05-16
FR2717410B1 (fr) 1996-06-07
DE69501416T2 (de) 1998-07-30
FR2717410A1 (fr) 1995-09-22

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