EP1620217A1 - Twin roll casting plant - Google Patents

Twin roll casting plant

Info

Publication number
EP1620217A1
EP1620217A1 EP04728773A EP04728773A EP1620217A1 EP 1620217 A1 EP1620217 A1 EP 1620217A1 EP 04728773 A EP04728773 A EP 04728773A EP 04728773 A EP04728773 A EP 04728773A EP 1620217 A1 EP1620217 A1 EP 1620217A1
Authority
EP
European Patent Office
Prior art keywords
scrap
housing
casting
collecting trough
collecting
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
EP04728773A
Other languages
German (de)
French (fr)
Other versions
EP1620217B1 (en
Inventor
Michael Zahedi
Thomas Stepanek
Gerald Hohenbichler
Franz PLÖCKINGER
Karl Klima
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.)
Primetals Technologies Austria GmbH
Original Assignee
Voest Alpine Industrienlagenbau GmbH
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 Voest Alpine Industrienlagenbau GmbH filed Critical Voest Alpine Industrienlagenbau GmbH
Publication of EP1620217A1 publication Critical patent/EP1620217A1/en
Application granted granted Critical
Publication of EP1620217B1 publication Critical patent/EP1620217B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • 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
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
    • B22D15/005—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor of rolls, wheels or the like
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0264—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements the maximum content of each alloying element not exceeding 5%
    • C22C33/0271—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements the maximum content of each alloying element not exceeding 5% with only C, Mn, Si, P, S, As as alloying elements, e.g. carbon steel

Definitions

  • the invention relates to a two-roll casting plant with two casting rolls rotating in opposite directions about horizontal axes, with a casting gap for the formation and removal of a thin cast metal strip, with a sealed housing which has a bottom and which the transport path of the metal strip leaving the casting gap from a vertical casting direction bounded in an almost horizontal direction of transport, with diverters for the metal strip in this housing and with a movable scrap collection container for the removal of scrap and scale from the two-roll caster.
  • the invention further relates to a method for initiating a casting process using the two-roll casting device according to the invention.
  • Two-roll casting machines are used for the production of metal strips, preferably steel strips, with a wide range and with a strip thickness of less than 10 mm in a continuous casting process.
  • metal strips preferably steel strips
  • strip thickness of less than 10 mm
  • a two-roll casting installation of the generic type is already known from WO 02/11924. It consists of two casting rolls rotating in opposite directions about horizontal axes of rotation, which together with side plates that can be placed on the end of the casting rolls form a melting space and a casting gap from which a cast metal strip is conveyed vertically downwards.
  • the cast metal strip is deflected into the horizontal to form a sagging loop and fed to one or more further treatment devices. Leaving the casting gap, the hot metal strip passes through a sealed chamber with a protective gas atmosphere, through which oxidation processes on the surface of the metal strip are largely avoided. All openings in this chamber are provided with sealed gates or locks.
  • the sealed chamber also includes a space open to the casting rolls for receiving a movable scrap wagon, which can be brought into a receiving position for the scrap and scale below the two casting rolls and removed from there via a lock system which can be flooded with protective gas ,
  • a lock system which can be flooded with protective gas .
  • large lock gates In order to manipulate the scrap car, large lock gates must be opened and large rooms accommodating the scrap car must be flooded with protective gas. Furthermore, complex sealing systems for the large lock gates must be installed.
  • a pivotable guide flap for the cast metal strip is also known, which in an operating position supports the diversion of the metal strip into the horizontal and to a drive roller stand and, in a retracted position, enables the vertical derivation of a strand piece into the scrap bucket.
  • Such a solution is also known from WO 01/23120.
  • the object of the present invention is therefore to avoid the disadvantages of the known prior art and to propose a two-roll casting installation and a method for initiating a casting process using a two-roll casting installation, which makes it possible to keep the space insulated with protective gas for the passage of a hot metal strip as small as possible and at the same time to enable the continuous collection of scrap and any scale that may occur without or with very little leakage from the housing.
  • Another object of the invention is to design the two-roll casting installation in such a way that the scrap or scale that is collected can be discharged with very little air entry into the insulated housing.
  • the bottom of the housing forms a collecting trough for the scrap, which is part of an emptying device, and that a movable scrap collecting container is arranged in a receiving position below the emptying device.
  • the emptying device comprises at least one collection trough for receiving the scrap, at least one support for this collection trough on a supporting frame or on the housing, which enables the collection trough to be actuated between a closed and an open position, and at least one adjusting drive for relocating the collection trough to be able to carry out an emptying and, if necessary, necessary seals in order to avoid the entry of false air into the housing.
  • An expedient embodiment consists in the fact that the collecting trough for the scrap can be displaced between a closed and an open position and is coupled to an adjusting drive and that the housing has a sealing element for sealing a gap between the housing and the collecting trough in the closed position is assigned.
  • the collecting trough can be made in one piece or in several parts and the emptying can be carried out by a displacement movement, preferably in the case of a one-piece design, or by a pivoting movement about one or more pivot axes, preferably in the case of a multi-part design.
  • An adjusting lever is assigned to the collecting trough, which can be formed by a controllable pressure medium cylinder or by at least one driven undercarriage wheel.
  • the sealing elements effective between the housing and the collecting trough are expediently fastened to the housing and can be pressed against the housing in the closed position. Damage to the sealing element during the manipulation of the collecting trough and in particular during scrap unloading is thus avoided.
  • a preferred embodiment of the sealing element consists in that the sealing element comprises a sealing ring which is movable relative to the housing and the collecting trough and can be pressed onto the collecting trough, which is carried by a displacement element which engages on the housing and is fastened to it, and which is coupled to a controllable displacement device.
  • the displacement element can be formed, for example, by a bellows or another elastic element permitting a longitudinal extension
  • the controllable displacement device can be formed, for example, by a pressure medium cylinder articulated on the housing.
  • the collecting trough expediently has a trolley and a trolley, in particular rails, is assigned to this trolley.
  • the distance between the collecting trough and the housing or the sealing element fastened to the housing can preferably be reduced to such an extent that a sealing closed position automatically or simultaneously with the approach to the closed position on the last section of the displacement path a small displacement of the sealing element is achieved.
  • the collecting trough has sliding elements and a stationary slideway is assigned to these sliding elements.
  • the closed can be started simultaneously with Position on the last section of the displacement path, the distance between the collecting trough and the housing or the sealing element fastened to the housing can be reduced to such an extent that a sealing closed position is achieved.
  • a clearing sword is arranged at a distance from the collection trough on the housing for stripping off the scrap accumulated in the collection trough.
  • the distance between the clearing sword and the collecting trough is selected so that there is no jamming of scrap parts between the stationary clearing sword and the collecting trough.
  • the clearing sword can slide on the trough. For emergencies, the clearing sword can be retracted transversely to the shifting movement of the collecting trough.
  • the collecting trough comprises a receiving area for the scrap, which can be designed differently.
  • the receiving area for the scrap can be formed by a flat surface, the associated clearing sword having a straight clearing edge which is arranged at a short distance from the surface of the receiving area or slides on it.
  • the receiving area for the scrap can also be designed as a trough-shaped depression, this depression preferably being on three sides of the collecting trough and on the fourth side, on which the emptying of the collecting trough takes place, the trough-shaped depression essentially runs out horizontally. Emptying with the help of a clearing sword, the clearing edge of which is adapted to the cross section of the trough-shaped depression, is equally possible.
  • a sealing element assigned to the housing is designed such that it can be pressed against the movable scrap container in its receiving position when the collecting trough is in the open position.
  • a further improvement of the seal can be achieved if a seal between the mobile scrap collection container and the housing is ensured on at least three sides during the ongoing displacement process of the collecting trough. This is achieved with a multi-part sealing element. In this way, it is expedient to minimize the air entry if a sealing element assigned to the housing is designed to be able to be pressed in its receiving position continuously or with sections on the mobile scrap container during the opening of the collecting trough.
  • the harmful air minimization can be achieved if the housing is assigned a single circumferential sealing element, which is designed to be able to be pressed against the mobile waste container when the collecting container is in the closed position and against the mobile waste container when the container is in the open position.
  • the harmful air minimization can be achieved if two mutually independent sealing elements are assigned to the housing, one of these sealing elements being designed to be able to be pressed against this collecting trough when the collecting trough is in the closed position, and the second sealing element is capable of being pressed against the mobile scrap collection container.
  • the two sealing elements are preferably fastened concentrically to one another on the outer wall of the housing and can be actuated independently of one another.
  • a further reduction in the remaining, very low, entry of harmful air can be achieved if the mobile scrap collection container is positioned in its receiving position in a closed scrap chamber, which sealingly connects to the housing below it.
  • a treatment chamber with a strip transport device for example a roller table, and optionally further strip treatment devices for the metal strip, for example a temperature compensation furnace in front of a roll stand, adjoin the housing flooded with protective gas, the bottom of this treatment chamber being emptied by at least one Collecting container for scale and possibly scrap, for example trimming scrap from a band trimming system, is formed.
  • a strip transport device for example a roller table
  • further strip treatment devices for the metal strip for example a temperature compensation furnace in front of a roll stand
  • the collecting container is preferably designed as a collecting trough with a closing device and can be formed, for example, by a funnel-shaped collecting bunker with a closing flap.
  • One or more receiving positions for a movable scrap collecting container are provided under the collecting containers.
  • the mobile scrap collection container is equipped with a drive control, which enables a controlled approach to all pick-up positions below the transport path of the metal strip.
  • the recording positions are determined, for example, by electrical sliding contacts or light barriers.
  • an operating method for initiating a casting process is proposed, which enables the derivation and removal of a first section of the cast metal strip, which is produced in an unsteady start phase of the two-roll casting plant and does not yet meet the quality requirements of the product to be produced.
  • a scrap manipulation is proposed that minimizes the entry of false air during this start-up phase as much as possible, but also allows the subsequent production steps and scrap removal from the plant with minimized air access.
  • the actual starting procedure can be done in different ways.
  • molten metal is introduced into the melt chamber up to an operational casting level and the metal strip is started to be conveyed out during this filling process.
  • This process can start with standing or already rotating casting rolls.
  • the width of the casting gap can also differ from that of an operating casting gap.
  • the filling process in the melt chamber, the casting speed and the casting gap width can follow a predetermined start-up curve.
  • the first section thus produced under transient casting conditions is separated under the effect of the dead weight of this strip section.
  • the casting speed and the width of the casting gap can follow a curve.
  • a preferred starting method for the casting process in a two-roll casting plant without taking the scrap industry into account has already been described in detail in the Austrian patent application AT-A 1367/2002 and should be regarded as an integral part of this application.
  • Fig. 1 shows a longitudinal section through a two-roll casting machine with an inventive
  • FIG. 2 shows an embodiment of a sealing element between the housing and a
  • FIG. 3 a first operating case of the two-roll casting plant according to the invention
  • Fig. 4 a second operating case of the two-roll casting plant according to the invention
  • Fig. 5 a third operating case of the two-roll casting plant according to the invention
  • Fig. 6 a further embodiment of a sealing element between the housing and a collecting bowl or a scrap container.
  • Fig. 1 shows a schematic representation of a two-roll casting plant of the type according to the invention for the continuous production of a steel strip.
  • the two-roll casting plant With its core device for forming the metal strip, the two-roll casting plant consists of two driven casting rolls 1, 2 rotating in opposite directions about horizontal axes, which together with two side plates 3, only one of which is shown in FIG. 1, one Form melt chamber 4 for the reception of molten metal, which is fed from an intermediate vessel 5 via a dip tube 6 into the melt chamber 4 and forms a melt bath there.
  • the melt chamber 4 is largely sealed airtight with a cover 7, which enables a protective gas atmosphere to be maintained above the melt bath.
  • the two cooled casting rolls 1, 2 and the side plates 3 lying against the end faces of the casting rolls form a casting gap 8, from which the metal melt previously solidified on the casting roll surfaces in the form of strand shells is conveyed out as a cast metal strip 9 in the vertical casting direction and deflected in a horizontal transport direction a drive roller stand 10 is fed to various further processing devices in the direction of the arrow.
  • a pivotable skid-shaped diverter 11 is provided below the casting gap 8, which is shown from a threading position shown with thick lines, in which the metal strip 9 is diverted to the drive roller frame 10, into a substantially vertical one with dash-dotted lines Treatment position can be pivoted. In this retracted position, strip sections, such as occur at the start and end of casting, can be disposed of as scrap vertically downwards.
  • the transport path of the metal strip 9 from the exit from the casting gap 8 to the entry into the drive roller frame 10 is delimited by a housing 13, which is usually formed by sheet metal walls with a refractory lining on the inside.
  • a housing 13 In the entry area of the metal strip into the housing 13, seals, not shown, are provided between the wall of the housing and the casting rolls 1, 2 and the side plates 3, as described in the Austrian patent application AT-A 303/2002.
  • the housing 13 is sealed by a treatment chamber 14, likewise flooded with protective gas, in which the metal strip is transported further on a roller table 15 and fed to further treatment devices, not shown.
  • the bottom 16 of the housing 13 forms an emptying device 17 and is formed in an area below the casting gap 8 by a collecting trough 18, in which falling, short strip sections separated from the production process and scale which occasionally falls off from the cast metal strip are collected.
  • the start-up piece of the cast metal strip formed at the start of casting during an unsteady start phase does not meet the required product requirements and is therefore at least partially not diverted into the horizontal transport direction for further processing to the first drive roller stand, but rather is diverted directly vertically downward into the collecting trough 18.
  • the collecting trough 18 has a trough-shaped receptacle for the scrap and is equipped with a chassis 19 which comprises bicycles 20 which roll on a roadway 21 formed by a horizontal longitudinal member or a rail. Via a hinged, controllable shifting device 22, which is formed by a long-stroke pressure medium cylinder 23, the collecting trough 18 can be displaced from a closed position shown in thick lines for receiving the scrap into a retracted open position shown in dash-dotted lines. With a clearing sword 27, which is arranged at a short distance above the collecting trough 18 and transversely to its direction of displacement, the accumulated scrap is removed from the collecting trough during the displacement movement into the open position and brought into a scrap collecting container 25 provided underneath.
  • the scrap collecting container is inserted in a traveling frame 28 and can be manipulated on the two-roll casting machine independently of the ongoing production process.
  • an adjustable sealing element 30 is arranged between these components.
  • a possible embodiment is shown schematically in FIG. 2 in a partial section. 2 shows a partial area of the lower end of the housing 13 and the collecting trough 18 for the scrap positioned at a distance below it.
  • a circumferential support flange 32 for fastening the sealing element 30 is welded to the outer wall 31 of the housing or its supporting structure.
  • a sealing ring 34 On a support plate 33 of the trough 18, which forms a sealing surface, there is a sealing ring 34 which is inserted in a sealing ring support frame 35 and fastened there. Between the support flange 32 and the sealing ring support frame 35 there is a displacement element 37 for the sealing ring support frame 35, which allows a change in length and is formed by a bellows 36, which is fastened sealingly on the one hand to the support flange 32 and on the other hand to the sealing ring support frame 35.
  • synchronously controllable shifting devices 38 which are formed by pressure medium cylinders 39, are arranged at several points, distributed over the circumference of the housing 13, with which the sealing ring 34 is connected to the support plate 33 of the collecting trough 18 in the closed position of the trough can be pressed or lifted from it if the trough is to be moved to its open position for emptying.
  • fenders 40 which can be telescopically pushed into one another are fastened both on the support flange 32 and on the sealing ring support frame 35 between the bellows and the outer wall 31 of the housing 13.
  • the sealing ring 34 is made of an elastic material such as fabric, fiber material and the like. But it can also be replaced by another type of seal, such as a sand seal, the support plate on the trough being designed as a trough-shaped receptacle for sand and instead of the sealing ring, a sealing plate is immersed in this sand fill in the closed position of the trough.
  • the sealing plate is in turn adjustable in height with a displacement element, such as a pressure medium cylinder.
  • FIGS. 3-5 analogously to FIG. 2, a further embodiment of the most efficient possible seal between the housing 13 and the collecting trough 18 arranged underneath it and the scrap collecting container 25 is shown.
  • the sealing element 30, as described in relation to FIG. 2 providing a tight connection to the collecting trough 18 and the further sealing element 30a arranged concentrically with this sealing element 30 Connects to the scrap container 25.
  • the construction of the two sealing elements 30, 30a is identical and corresponds to the explanations for FIG. 2. Any other sealing element with the same effect can be used in the same way. As a result of this double arrangement, a sealing connection always remains, either to the collecting trough 18 or to the scrap collecting container 25 on at least three sides during all operating cases.
  • the trough 18 here is trough-shaped, double-walled and water-cooled and filled with sand.
  • FIG. 3 illustrates an operating case as it occurs in the start-up phase of the casting process.
  • the scrap trough 18 is moved into the open position, so that the housing 13 to the scrap collection container 25 is open and falling strip parts fall directly into the scrap collection container.
  • the sealing element 30 encompassing the housing 13 on all sides rests with its sealing ring 34 on the support plate 33 of the scrap collecting container 25 and is in its deepest operating position and seals the gap between the housing and the scrap collecting container.
  • FIG. 4 illustrates an operating case in which the collecting trough 18 assumes the closed position below the housing 13 and the sealing element 30 with its sealing ring 34 rests on the support plate 33 of the collecting trough 18. Any scrap and scale falling down are collected in the trough until the scrap collection container 25 returns to its receiving position below the closed trough after it has been emptied. During this closed position of the collection trough 18, the scrap collection container 25 can be operated without impairment of the production process on the two-roll casting system can be briefly driven out of the system at any time to empty it.
  • FIG. 5 illustrates the operating case in which accumulated scrap is emptied from the collection trough 18 into the scrap collection container.
  • the sealing element 30, which closes the gap between the housing 13 and the collecting trough 18 in an air-tight manner, is raised into a release position, the collecting trough 18 is brought into its open position by a transverse movement and, at the same time, scrap collected with the clearing sword 27 in the collecting trough is collected in the collecting trough Scrap container pushed.
  • the sealing element 30 is placed on the scrap collection container. With a sealing element segmented along its circumferential extent, individual segments can be placed on the scrap collection container immediately after the collection trough has been moved away.
  • the treatment chamber 14 immediately following on the transport path of the cast metal strip of the housing 13 can also be flooded with protective gas.
  • the bottom of this treatment chamber 14 below the belt transport device 15 formed by a roller table, on which the still hot metal belt is transported is equipped with two emptied, funnel-shaped collecting containers 41 with closure flaps 43, which are opened by pressure medium cylinders 42 and can be closed.
  • a scrap collecting container 25 equipped with a driving control can move to the emptying position below the closed collecting trough 18 as well as individual emptying positions below the closing flaps 43, which are opened after the respective emptying position has been assumed.
  • the individual emptying positions are determined by sliding contacts or light barriers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

A two-roll casting installation with two casting rolls which rotate in opposite directions about horizontal axes and forming a casting gap for forming and discharging a thin cast metal strip. A sealed housing which has a base and surrounds a conveying path for the metal strip which leaves the casting gap and which strip is from a vertical casting direction into an approximately horizontal conveying direction. Diverter devices divert the metal strip within the housing. A displaceable scrap collection container removes scrap and scale produced from the two-roll casting installation. To minimize the penetration of external air into the housing, the base of the housing, at least in a subregion, forms a collection trough for the scrap, which is part of an emptying device, and a displaceable scrap collection container is arranged in a receiving position below the emptying device.

Description

ZweiwalzenqießeinrichtungZweiwalzenqießeinrichtung
Die Erfindung betrifft eine Zweiwalzengießanlage mit zwei um horizontale Achsen gegensinnig rotierende Gießwalzen, mit einem Gießspalt für die Bildung und das Ausfördern eines dünnen gegossenen Metallbandes, mit einer abgedichteten Einhausung, die einen Boden aufweist und die den Transportweg des den Gießspalt verlassenden Metallbandes von einer vertikalen Gießrichtung in eine annähernd horizontale Transportrichtung umgrenzt, mit Umleiteinrichtungen für das Metallband in dieser Einhausung und mit einem verfahrbaren Schrottsammelbehälter zum Abtransport von anfallendem Schrott und Zunder aus der Zweiwalzengießanlage. Weiters betrifft die Erfindung ein Verfahren zum Einleiten eines Gießprozesses unter Verwendung der erfindungsgemäßen Zweiwalzengießeinrichtung.The invention relates to a two-roll casting plant with two casting rolls rotating in opposite directions about horizontal axes, with a casting gap for the formation and removal of a thin cast metal strip, with a sealed housing which has a bottom and which the transport path of the metal strip leaving the casting gap from a vertical casting direction bounded in an almost horizontal direction of transport, with diverters for the metal strip in this housing and with a movable scrap collection container for the removal of scrap and scale from the two-roll caster. The invention further relates to a method for initiating a casting process using the two-roll casting device according to the invention.
Zweiwalzengießanlagen werden zur Herstellung von Metallbändem, vorzugsweise von Stahlbändern, mit großer Bandbreite und mit einer Banddicke von weniger als 10 mm in einem kontinuierlichen Gießprozess eingesetzt. Insbesondere bei Kohlenstoffstählen tritt bei hohen Temperaturen eine hohe Verzunderungsneigung bei Kontakt mit Sauerstoff auf, sodass die Metallschmelze und das gegossenen Metallband bis zu seiner weitgehenden Abkühlung in einer nicht oxidierend wirkenden Schutzgasatmosphäre geführt werden.Two-roll casting machines are used for the production of metal strips, preferably steel strips, with a wide range and with a strip thickness of less than 10 mm in a continuous casting process. Particularly in the case of carbon steels, there is a high tendency to scale upon contact with oxygen at high temperatures, so that the molten metal and the cast metal strip are conducted in a non-oxidizing protective gas atmosphere until they have cooled to a large extent.
Aus der WO 02/11924 ist eine Zweiwalzengießanlage der gattungsbildenden Art bereits bekannt. Sie besteht aus zwei um horizontale Drehachsen gegenläufig rotierende Gießwalzen, die zusammen mit stirnseitig an die Gießwalzen anstellbaren Seitenplatten einen Schmelzenraum und einen Gießspalt bilden, aus dem ein gegossenes Metallband vertikal nach unten ausgefördert wird. Das gegossene Metallband wird unter Ausbildung einer durchhängenden Schlaufe in die Horizontale umgelenkt und einer oder mehreren Weiterbehandlungseinrichtungen zugeführt. Aus dem Gießspalt austretend, durchläuft das heiße Metallband eine abgedichtete Kammer mit einer Schutzgasatmosphäre, durch die Oxidationsvorgänge an der Metallbandoberfläche weitgehend vermieden werden. Alle Öffnungen in dieser Kammer sind mit abgedichteten Toren bzw. Schleusen versehen. Die abgedichtete Kammer umfasst auch einen zu den Gießwalzen offenen Raum für die Aufnahme eines verfahrbaren Schrottwagens, der über ein Schleusensystem, welches mit Schutzgas geflutet werden kann, in eine Aufnahmeposition für den anfallenden Schrott und Zunder unterhalb der beiden Gießwalzen gebracht und von dort entfernt werden kann. Zur Manipulation des Schrottwagens müssen große Schleusentore geöffnet werden und große den Schrottwagen aufnehmende Räume mit Schutzgas geflutet werden. Weiters müssen aufwendige Dichtsystem für die großen Schleusentore installiert sein.A two-roll casting installation of the generic type is already known from WO 02/11924. It consists of two casting rolls rotating in opposite directions about horizontal axes of rotation, which together with side plates that can be placed on the end of the casting rolls form a melting space and a casting gap from which a cast metal strip is conveyed vertically downwards. The cast metal strip is deflected into the horizontal to form a sagging loop and fed to one or more further treatment devices. Leaving the casting gap, the hot metal strip passes through a sealed chamber with a protective gas atmosphere, through which oxidation processes on the surface of the metal strip are largely avoided. All openings in this chamber are provided with sealed gates or locks. The sealed chamber also includes a space open to the casting rolls for receiving a movable scrap wagon, which can be brought into a receiving position for the scrap and scale below the two casting rolls and removed from there via a lock system which can be flooded with protective gas , In order to manipulate the scrap car, large lock gates must be opened and large rooms accommodating the scrap car must be flooded with protective gas. Furthermore, complex sealing systems for the large lock gates must be installed.
Aus der WO 02/11924 ist weiters eine schwenkbare Leitklappe für das gegossene Metallband bekannt, die in einer Betriebsposition die Umleitung des Metallbandes in die Horizontale und zu einem Treibrollengerüst unterstützt und in einer Rückzugsposition die vertikale Ableitung eines Strangstückes in den Schrottkübel ermöglicht. Eine derartige Lösung ist auch aus der WO 01/23120 bekannt.From WO 02/11924 a pivotable guide flap for the cast metal strip is also known, which in an operating position supports the diversion of the metal strip into the horizontal and to a drive roller stand and, in a retracted position, enables the vertical derivation of a strand piece into the scrap bucket. Such a solution is also known from WO 01/23120.
Aus der EP-B 726 112 und der WO 01/39914 sind Zweiwalzengießanlagen der gattungsbildenden Art bekannt, bei denen das gegossene Metallband durch eine isolierte Kammer ohne integrierten Bodenbereich geführt wird. Der Bodenbereich wird von einem stirnseitig an die Seitenwände der isolierten Kammer vertikal anpressbaren Schrottkübel gebildet, der auf einem verfahrbaren Schrottwagen heb- und senkbar aufliegt. Zwischen den Seitenwänden der isolierten Kammer und den Rändern des Schrottkübels ist eine Dichtung vorgesehen, mit der die isolierte Kammer weitgehend gasdicht abgeschlossen wird. Bei einem Wechsel des mit Schrott gefüllten Schrottkübels geht auch die Schutzgasatmosphäre in der vom Metallband durchlaufenen isolierten Kammer verloren und es ist notwendig, die gesamte Kammer nach dem Wiedereinsetzen eines leeren Schrottkübels mit Schutzgas zu fluten, wobei der Verbleib einer größeren Menge von Falschluft und damit Restsauerstoff unvermeidbar ist. Dadurch kommt es zu einer verstärkten Verzunderung des nachfolgend gegossenen Metallbandes über einen längeren Zeitraum und damit zu vermehrten Schrottanfall bzw. zu einer Beeinträchtigung der Oberflächenqualität des gegossenen Bandes. Deshalb ist eine Entleerung des Schrottkübels ausschließlich in Produktionspausen möglich.From EP-B 726 112 and WO 01/39914 two-roll casting plants of the generic type are known, in which the cast metal strip is guided through an insulated chamber without an integrated floor area. The floor area is formed by a scrap bucket that can be pressed vertically onto the side walls of the insulated chamber and rests on a movable scrap wagon so that it can be raised and lowered. A seal is provided between the side walls of the insulated chamber and the edges of the scrap bucket, with which the insulated chamber is largely sealed gas-tight. When the scrap bucket filled with scrap is changed, the protective gas atmosphere in the insulated chamber through which the metal strip passes is also lost and it is necessary to flood the entire chamber with protective gas after an empty scrap bucket has been reinserted, with a large amount of false air and thus residual oxygen remaining is inevitable. This leads to an increased scaling of the subsequently cast metal strip over a longer period of time and thus to an increased amount of scrap or to an impairment of the surface quality of the cast strip. Therefore, the scrap bucket can only be emptied during production breaks.
Aufgabe der vorliegenden Erfindung ist es daher, die Nachteile des bekannten Standes der Technik zu vermeiden und eine Zweiwalzengießanlage und ein Verfahren zum Einleiten eines Gießprozesses unter Verwendung einer Zweiwalzengießanlage vorzuschlagen, wodurch es ermöglicht wird, den mit Schutzgas isolierten Raum für die Durchführung eines heißen Metallbandes möglichst klein zu halten und gleichzeitig eine kontinuierliches Sammeln von Schrott und gegebenenfalls anfallenden Zunder ohne beziehungsweise mit nur sehr geringen Leckagen an der Einhausung zu ermöglichen.The object of the present invention is therefore to avoid the disadvantages of the known prior art and to propose a two-roll casting installation and a method for initiating a casting process using a two-roll casting installation, which makes it possible to keep the space insulated with protective gas for the passage of a hot metal strip as small as possible and at the same time to enable the continuous collection of scrap and any scale that may occur without or with very little leakage from the housing.
Ein weiteres Ziel der Erfindung besteht darin, die Zweiwalzengießanlage so auszubilden, dass eine Ableitung des gesammelten Schrottes bzw. Zunders mit sehr geringen Lufteintritt in die isolierte Einhausung zu ermöglichen.Another object of the invention is to design the two-roll casting installation in such a way that the scrap or scale that is collected can be discharged with very little air entry into the insulated housing.
Diese gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, dass der Boden der Einhausung zumindest in einem Teilbereich eine Sammelmulde für den Schrott bildet, die Teil einer Entleereinrichtung ist, und dass ein verfahrbarer Schrottsammelbehälter in einer Aufnahmeposition unterhalb der Entleereinrichtung angeordnet ist.This object is achieved according to the invention in that the bottom of the housing forms a collecting trough for the scrap, which is part of an emptying device, and that a movable scrap collecting container is arranged in a receiving position below the emptying device.
Durch die Ausgestaltung eines Teilbereiches der Einhausung als Sammelmulde für anfallenden Schrott und die Anordnung des ein großes Volumen einnehmenden Schrottwagens außerhalb dieser Einhausung kann der eigentliche Sammelraum für den Schrott klein gehalten werden, wodurch auch das mit Schutzgas zu flutende Volumen der Einhausung minimiert ist. Gleichzeitig bietet diese Anordnung die Möglichkeit, den Schrottwagen unabhängig vom laufenden Produktionsprozess auf der Zweiwalzengießanlage zu manipulieren.By designing a partial area of the housing as a collecting trough for scrap and the arrangement of the scrap vehicle taking up a large volume outside of this housing, the actual collecting space for the scrap can be kept small, which also minimizes the volume of the housing to be flooded with protective gas. At the same time, this arrangement offers the possibility of manipulating the scrap wagon on the two-roll caster regardless of the ongoing production process.
Die Entleereinrichtung umfasst zumindest eine Sammelmulde für die Aufnahme des Schrottes, mindestens eine Abstützung für diese Sammelmulde an einem Traggerüst oder an der Einhausung, die eine Betätigung der Sammelmulde zwischen einer geschlossenen und einer geöffneten Position ermöglicht, mindestens einen Versteilantrieb für eine Verlagerung der Sammelmulde, um eine Entleerung durchführen zu können und gegebenenfalls notwendige Dichtungen, um den Falschlufteintritt in die Einhausung zu vermeiden.The emptying device comprises at least one collection trough for receiving the scrap, at least one support for this collection trough on a supporting frame or on the housing, which enables the collection trough to be actuated between a closed and an open position, and at least one adjusting drive for relocating the collection trough to be able to carry out an emptying and, if necessary, necessary seals in order to avoid the entry of false air into the housing.
Eine zweckmäßige Ausführungsform besteht darin, dass die Sammelmulde für den Schrott zwischen einer geschlossenen und einer geöffneten Position verlagerbar ausgebildet und mit einem Versteilantrieb gekoppelt ist und dass der Einhausung ein Dichtelement zur Abdichtung eines Spaltes zwischen der Einhausung und der Sammelmulde in der geschlossenen Position zugeordnet ist. Hierzu sind verschiedene Ausführungsformen möglich. Die Sammelmulde kann einteilig oder mehrteilig ausgebildet sein und die Entleerung kann durch eine Verschiebebewegung, vorzugsweise bei einer einteiligen Bauart oder durch eine Schwenkbewegung um eine oder mehrere Schwenkachsen, vorzugsweise bei einer mehrteiligen Bauart, erfolgen. Der Sammelmulde ist ein Verstellantheb zugeordnet, der von einem ansteuerbaren Druckmittelzylinder oder von mindestens einem angetriebenen Fahrwerksrad gebildet sein kann.An expedient embodiment consists in the fact that the collecting trough for the scrap can be displaced between a closed and an open position and is coupled to an adjusting drive and that the housing has a sealing element for sealing a gap between the housing and the collecting trough in the closed position is assigned. Various embodiments are possible for this. The collecting trough can be made in one piece or in several parts and the emptying can be carried out by a displacement movement, preferably in the case of a one-piece design, or by a pivoting movement about one or more pivot axes, preferably in the case of a multi-part design. An adjusting lever is assigned to the collecting trough, which can be formed by a controllable pressure medium cylinder or by at least one driven undercarriage wheel.
Die zwischen der Einhausung und der Sammelmulde wirksamen Dichtelemente sind zweckmäßig an der Einhausung befestigt und in der geschlossenen Position der Sammelmulde an diese anpressbar ausgebildet. Damit werden Beschädigungen des Dichtelementes bei der Manipulation der Sammelmulde und insbesondere bei der Schrottentladung vermieden.The sealing elements effective between the housing and the collecting trough are expediently fastened to the housing and can be pressed against the housing in the closed position. Damage to the sealing element during the manipulation of the collecting trough and in particular during scrap unloading is thus avoided.
Eine bevorzugte Ausgestaltung des Dichtelementes besteht darin, dass das Dichtelement einen zur Einhausung und zur Sammelmulde relativbeweglichen und an die Sammelmulde anpressbaren Abdichtring umfasst, der von einem an der Einhausung angreifenden und an ihr befestigten Verlagerungselement getragen ist, und der mit einer steuerbaren Verschiebeeinrichtung gekoppelt ist. Hierbei kann das Verlagerungselement beispielsweise von einem Faltenbalg oder einem anderen elastischen eine Längserstreckung zulassenden Element und die steuerbare Verschiebeeinrichtung beispielsweise von einem an der Einhausung angelenkten Druckmittelzylinder gebildet sein.A preferred embodiment of the sealing element consists in that the sealing element comprises a sealing ring which is movable relative to the housing and the collecting trough and can be pressed onto the collecting trough, which is carried by a displacement element which engages on the housing and is fastened to it, and which is coupled to a controllable displacement device. Here, the displacement element can be formed, for example, by a bellows or another elastic element permitting a longitudinal extension, and the controllable displacement device can be formed, for example, by a pressure medium cylinder articulated on the housing.
Zweckmäßig weist die Sammelmulde ein Fahrwerk auf und diesem Fahrwerk ist eine Fahrbahn, insbesondere Schienen, zugeordnet. Durch eine entsprechende Ausgestaltung der Fahrbahn kann in bevorzugter Weise gleichzeitig mit dem Anfahren der geschlossenen Position am letzten Teilstück des Verschiebeweges der Abstand zwischen der Sammelmulde und der Einhausung bzw. dem an der Einhausung befestigten Dichtelement soweit verringert werden, dass eine abdichtende geschlossene Position selbsttätig oder mit einem geringen Verschiebeweg des Dichtelementes erreicht wird.The collecting trough expediently has a trolley and a trolley, in particular rails, is assigned to this trolley. By means of a corresponding design of the roadway, the distance between the collecting trough and the housing or the sealing element fastened to the housing can preferably be reduced to such an extent that a sealing closed position automatically or simultaneously with the approach to the closed position on the last section of the displacement path a small displacement of the sealing element is achieved.
Nach einer alternativen Ausführungsform weist die Sammelmulde Gleitelemente auf und diesen Gleitelementen ist eine stationäre Gleitbahn zugeordnet. Durch eine entsprechende Ausgestaltung der Gleitbahn kann gleichzeitig mit dem Anfahren der geschlossenen Position am letzten Teilstück des Verschiebeweges der Abstand zwischen der Sammelmulde und der Einhausung bzw. dem an der Einhausung befestigten Dichtelement soweit verringert werden, dass eine abdichtende geschlossene Position erreicht wird.According to an alternative embodiment, the collecting trough has sliding elements and a stationary slideway is assigned to these sliding elements. By means of an appropriate design of the slideway, the closed can be started simultaneously with Position on the last section of the displacement path, the distance between the collecting trough and the housing or the sealing element fastened to the housing can be reduced to such an extent that a sealing closed position is achieved.
Sofern die Entleerung der Sammelmulde während einer horizontalen Verschiebebewegung der Sammelmulde erfolgt, ist es vorteilhaft, wenn im Abstand von der Sammelmulde an der Einhausung ein Räumschwert zum Abstreifen des in der Sammelmulde angesammelten Schrottes angeordnet ist. Hierbei ist der Abstand zwischen dem Räumschwert und der Sammelmulde so gewählt, dass es zu keinem Einklemmen von Schrottteilen zwischen dem stationären Räumschwert und der Sammelmulde kommt. Das Räumschwert kann hierbei gleitend auf der Sammelmulde aufliegen. Für Notfälle ist eine Rückzugsmöglichkeit des Räumschwertes quer zur Verschiebebewegung der Sammelmulde vorgesehen.If the collection trough is emptied during a horizontal displacement movement of the collection trough, it is advantageous if a clearing sword is arranged at a distance from the collection trough on the housing for stripping off the scrap accumulated in the collection trough. The distance between the clearing sword and the collecting trough is selected so that there is no jamming of scrap parts between the stationary clearing sword and the collecting trough. The clearing sword can slide on the trough. For emergencies, the clearing sword can be retracted transversely to the shifting movement of the collecting trough.
Die Sammelmulde umfasst einen Aufnahmebereich für den Schrott, der unterschiedlich ausgestaltet sein kann. Der Aufnahmebereich für den Schrott kann von einer ebenen Fläche gebildet sein, wobei das zugeordnete Räumschwert eine gerade Räumkante aufweist, die in einem geringen Abstand von der Oberfläche des Aufnahmebereiches angeordnet ist oder auf ihr gleitet. Der Aufnahmebereich für den Schrott kann auch als muldenförmige Vertiefung ausgeformt sein, wobei diese Vertiefung vorzugsweise an drei Seiten der Sammelmulde besteht und an der vierten Seite, an der die Entleerung der Sammelmulde stattfindet, die muldenförmige Vertiefung im Wesentlichen horizontal ausläuft. Damit ist eine Entleerung mit Hilfe eines Räumschwertes, dessen Räumkante dem Querschnitt der muldenförmigen Vertiefung angepasst ist, gleichermaßen möglich.The collecting trough comprises a receiving area for the scrap, which can be designed differently. The receiving area for the scrap can be formed by a flat surface, the associated clearing sword having a straight clearing edge which is arranged at a short distance from the surface of the receiving area or slides on it. The receiving area for the scrap can also be designed as a trough-shaped depression, this depression preferably being on three sides of the collecting trough and on the fourth side, on which the emptying of the collecting trough takes place, the trough-shaped depression essentially runs out horizontally. Emptying with the help of a clearing sword, the clearing edge of which is adapted to the cross section of the trough-shaped depression, is equally possible.
Um auch bei geöffneter Position der Sammelmulde den Schadlufteintritt in die Einhausung gering zu halten oder weitestgehend zu vermeiden, ist ein der Einhausung zugeordnetes Dichtelement bei geöffneter Position der Sammelmulde an den fahrbaren Schrottsammelbehälter in seiner Aufnahmeposition anpressbar ausgebildet. Eine weitere Verbesserung der Abdichtung kann erzielt werden, wenn während des laufenden Verschiebevorganges der Sammelmulde an mindestens drei Seiten eine Abdichtung zwischen dem fahrbaren Schrottsammelbehälter und der Einhausung sichergestellt ist. Dies wird durch ein mehrteiliges Dichtelement erreicht. Solcherart ist es zur Minimierung des Lufteintrittes zweckmäßig, wenn ein der Einhausung zugeordnetes Dichtelement während des Öffnens der Sammelmulde kontinuierlich oder mit Teilabschnitten an den fahrbaren Schrottsammelbehälter in seiner Aufnahmeposition anpressbar ausgebildet ist.In order to keep the entry of harmful air into the housing low or largely avoid it, even when the collecting trough is in the open position, a sealing element assigned to the housing is designed such that it can be pressed against the movable scrap container in its receiving position when the collecting trough is in the open position. A further improvement of the seal can be achieved if a seal between the mobile scrap collection container and the housing is ensured on at least three sides during the ongoing displacement process of the collecting trough. This is achieved with a multi-part sealing element. In this way, it is expedient to minimize the air entry if a sealing element assigned to the housing is designed to be able to be pressed in its receiving position continuously or with sections on the mobile scrap container during the opening of the collecting trough.
Nach einer möglichen Ausführungsform kann die Schadluftminimierung erreicht werden, wenn der Einhausung ein einziges umlaufendes Dichtelement zugeordnet ist, welches bei geschlossener Position der Sammelmulde an diese und bei geöffneter Position der Sammelmulde an den fahrbaren Schrottsammelbehälter anpressbar ausgebildet ist. Nach einer weiteren sehr vorteilhaften Ausführungsform kann die Schadluftminimierung erreicht werden, wenn der Einhausung zwei voneinander unabhängige Dichtelemente zugeordnet sind, wobei eines dieser Dichtelemente bei geschlossener Position der Sammelmulde an diese Sammelmulde und das zweite Dichtelement an den fahrbaren Schrottsammelbehälter anpressbar ausgebildet ist. Die beiden Dichtelemente sind vorzugsweise zueinander konzentrisch an der Außenwand der Einhausung befestigt und unabhängig voneinander betätigbar.According to a possible embodiment, the harmful air minimization can be achieved if the housing is assigned a single circumferential sealing element, which is designed to be able to be pressed against the mobile waste container when the collecting container is in the closed position and against the mobile waste container when the container is in the open position. According to a further very advantageous embodiment, the harmful air minimization can be achieved if two mutually independent sealing elements are assigned to the housing, one of these sealing elements being designed to be able to be pressed against this collecting trough when the collecting trough is in the closed position, and the second sealing element is capable of being pressed against the mobile scrap collection container. The two sealing elements are preferably fastened concentrically to one another on the outer wall of the housing and can be actuated independently of one another.
Eine weitere Verminderung des verbleibenden nur mehr sehr geringen Schadlufteintrages kann erreicht werden, wenn der fahrbare Schrottsammelbehälter in seiner Aufnahmeposition in einer geschlossenen Schrottkammer positioniert ist, die unterhalb der Einhausung dichtend an diese anschließt.A further reduction in the remaining, very low, entry of harmful air can be achieved if the mobile scrap collection container is positioned in its receiving position in a closed scrap chamber, which sealingly connects to the housing below it.
Dem Transportweg des gegossenen Metallbandes folgend, schließen an die mit Schutzgas geflutete Einhausung eine Behandlungskammer mit einer Bandtransporteinrichtung, beispielsweise ein Rollgang, und gegebenenfalls weitere Bandbehandlungseinrichtungen für das Metallband, beispielsweise ein Temperaturausgleichsofen vor einem Walzgerüst, an, wobei der Boden dieser Behandlungskammer von mindestens einem entleerbaren Sammelbehälter für Zunder und gegebenenfalls Schrott, beispielsweise Besäumschrott aus einer Bandbesäumanlage, gebildet ist.Following the transport route of the cast metal strip, a treatment chamber with a strip transport device, for example a roller table, and optionally further strip treatment devices for the metal strip, for example a temperature compensation furnace in front of a roll stand, adjoin the housing flooded with protective gas, the bottom of this treatment chamber being emptied by at least one Collecting container for scale and possibly scrap, for example trimming scrap from a band trimming system, is formed.
Vorzugsweise ist der Sammelbehälter als Sammelmulde mit einer Verschlusseinrichtung ausgebildet und kann beispielsweise von einem trichterförmigen Sammelbunker mit einer Verschlussklappe gebildet sein. Unter den Sammelbehältern sind eine oder mehrere Aufnahmepositionen für einen verfahrbaren Schrottsammelbehälter vorgesehen. Der fahrbare Schrottsammelbehälter ist mit einer Fahrsteuerung ausgestattet, die ein gesteuertes Anfahren aller Aufnahmepositionen unterhalb des Transportweges des Metallbandes ermöglicht. Die Aufnahmepositionen sind beispielsweise durch elektrische Schleifkontakte oder Lichtschranken festgelegt.The collecting container is preferably designed as a collecting trough with a closing device and can be formed, for example, by a funnel-shaped collecting bunker with a closing flap. One or more receiving positions for a movable scrap collecting container are provided under the collecting containers. The mobile scrap collection container is equipped with a drive control, which enables a controlled approach to all pick-up positions below the transport path of the metal strip. The recording positions are determined, for example, by electrical sliding contacts or light barriers.
Unter Verwendung der erfindungsgemäßen Zweiwalzengießeinrichtung wird ein Betriebsverfahren zum Einleiten eines Gießprozesses vorgeschlagen, welches die Ableitung und Entfernung eines ersten Teilstückes des gegossenen Metallbandes aus der Anlage ermöglicht, das in einer instationären Startphase der Zweiwalzengießanlage hergestellt wird und den Qualitätsanforderungen des zu erzeugenden Produktes noch nicht entspricht. Hierbei wird insbesondere eine Schrottmanipulation vorgeschlagen, die den Falschluftzutritt während dieser Startphase weitestgehend minimiert, aber auch die nachfolgenden Produktionsschritte und Schrottentfernung aus der Anlage mit minimiertem Luftzutritt gestattet.Using the two-roll casting device according to the invention, an operating method for initiating a casting process is proposed, which enables the derivation and removal of a first section of the cast metal strip, which is produced in an unsteady start phase of the two-roll casting plant and does not yet meet the quality requirements of the product to be produced. In particular, a scrap manipulation is proposed that minimizes the entry of false air during this start-up phase as much as possible, but also allows the subsequent production steps and scrap removal from the plant with minimized air access.
Diese Vorteile werden bei einer Zweiwalzengießanlage, bei der zwei um horizontale Achsen gegensinnig rotierende Gießwalzen und an diese anpressbare Seitenplatten einen Schmelzenraum für die Aufnahme von Metallschmelze und einen Gießspalt für die Formgebung eines gegossenen Metallstranges bilden und wobei Metallschmelze in den Schmelzenraum kontinuierlich oder nach einer vorgegebenen Anfahrkurve eingebracht wird und ein gegossenes Metallband aus dem Gießspalt kontinuierlich oder nach einer vorgegebenen Anfahrkurve ausgefördert wird, dadurch erreicht, dass ein in einer instationären Startphase gegossenes erstes Teilstück des Metallbandes bei einer in eine Rückzugsposition verschwenkten Umleiteinrichtung und bei einer in eine zurückgezogene geöffnete Position verlagerte Sammelmulde in im Wesentlichen vertikaler Richtung direkt in den Schrottsammelbehälter gefördert wird, dass mit Erreichen einer stationären Betriebsphase das erste Teilstück des gegossenen Metallbandes, vorzugsweise im Gießspalt abgetrennt wird, dass anschließend die Umleiteinrichtung in die Einfädelposition verschwenkt wird und dass das nachfolgende gegossene Metallband in eine im Wesentlichen horizontale Transportrichtung geleitet wird und anschließend oder gleichzeitig die Sammelmulde in die geschlossene Position verlagert wird. Die eigentliche Startprozedur kann auf verschiedene Art und Weise erfolgen. In einem ersten Schritt wird Metallschmelze bis zu einem Betriebsgießspiegel in den Schmelzenraum eingebracht und während dieses Füllvorganges mit dem Ausfördern des Metallbandes begonnen. Dieser Vorgang kann mit stehenden oder bereits rotierenden Gießwalzen beginnen. Auch der Gießspalt kann in seiner Breite von einer Betriebsgießspaltbreite abweichen. Insgesamt können der Füllvorgang im Schmelzenraum, die Gießgeschwindigkeit und die Gießspaltbreite einer vorgegebenen Anfahrkurve folgen. Das Abtrennen des solcherart unter instationären Gießbedingungen hergestellten ersten Teilstückes erfolgt unter Wirkung des Eigengewichtes dieses Bandabschnittes. Auch hierbei können die Gießgeschwindigkeit und die Gießspaltbreite einer Verlaufskurve folgen. Ein bevorzugtes Startverfahren für den Gießprozess in einer Zweiwalzengießanlage ohne Berücksichtigung der Schrottwirtschaft ist im Detail bereits in der österreichischen Patentanmeldung AT-A 1367/2002 beschrieben und als integrierter Bestandteil dieser Anmeldung zu betrachten.These advantages will form in a two-roll casting machine in which two casting rolls rotating in opposite directions about horizontal axes and side plates that can be pressed against them form a melting space for the reception of molten metal and a casting gap for the shaping of a cast metal strand, and with molten metal in the melting space continuously or according to a predetermined starting curve is introduced and a cast metal strip is conveyed out of the casting gap continuously or according to a predetermined start-up curve, in that a first section of the metal strip cast in an unsteady starting phase is achieved with a diverting device pivoted into a retracted position and with a collecting trough displaced into a retracted open position is conveyed essentially vertically directly into the scrap collection container, that the first section of the cast metal strip, before reaching a stationary operating phase is preferably cut off in the casting gap, that the diversion device is then pivoted into the threading position and that the subsequent cast metal strip is guided in a substantially horizontal transport direction and then or at the same time the collecting trough is moved into the closed position. The actual starting procedure can be done in different ways. In a first step, molten metal is introduced into the melt chamber up to an operational casting level and the metal strip is started to be conveyed out during this filling process. This process can start with standing or already rotating casting rolls. The width of the casting gap can also differ from that of an operating casting gap. Overall, the filling process in the melt chamber, the casting speed and the casting gap width can follow a predetermined start-up curve. The first section thus produced under transient casting conditions is separated under the effect of the dead weight of this strip section. Here, too, the casting speed and the width of the casting gap can follow a curve. A preferred starting method for the casting process in a two-roll casting plant without taking the scrap industry into account has already been described in detail in the Austrian patent application AT-A 1367/2002 and should be regarded as an integral part of this application.
Weitere Vorteile und Merkmale der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung nicht einschränkender Ausführungsbeispiele, wobei auf die beiliegenden Figuren Bezug genommen wird, die folgendes zeigen:Further advantages and features of the present invention result from the following description of non-restrictive exemplary embodiments, reference being made to the accompanying figures, which show the following:
Fig. 1 einen Längsschnitt durch eine Zweiwalzengießanlage mit einer erfindungsgemäßenFig. 1 shows a longitudinal section through a two-roll casting machine with an inventive
Entleereinrichtung, Fig. 2 eine Ausführungsform eines Dichtelementes zwischen der Einhausung und einer2 shows an embodiment of a sealing element between the housing and a
Sammelmulde bzw. einem Schrottsammelbehälter, Fig. 3 einen ersten Betriebsfall der erfindungsgemäßen Zweiwalzengießanlage, Fig. 4 einen zweiten Betriebsfall der erfindungsgemäßen Zweiwalzengießanlage, Fig. 5 einen dritten Betriebsfall der erfindungsgemäßen Zweiwalzengießanlage, Fig. 6 eine weitere Ausführungsform eines Dichtelementes zwischen der Einhausung und einer Sammelmulde bzw. einem Schrottsammelbehälter.3 a first operating case of the two-roll casting plant according to the invention, Fig. 4 a second operating case of the two-roll casting plant according to the invention, Fig. 5 a third operating case of the two-roll casting plant according to the invention, Fig. 6 a further embodiment of a sealing element between the housing and a collecting bowl or a scrap container.
Fig. 1 zeigt in schematischer Darstellung eine Zweiwalzengießanlage der erfindungsgemäßen Art zur kontinuierlichen Herstellung eines Stahlbandes. Die Zweiwalzengießanlage besteht mit ihrer Kerneinrichtung zur Ausbildung des Metallbandes aus zwei um horizontale Achsen gegensinnig rotierende, angetriebene Gießwalzen 1 , 2, die zusammen mit zwei Seitenplatten 3, von denen nur eine in Fig. 1 dargestellt ist, einen Schmelzenraum 4 für die Aufnahme von Metallschmelze bilden, die aus einem Zwischengefäß 5 über ein Tauchrohr 6 in den Schmelzenraum 4 zugeführt wird und dort ein Schmelzenbad bildet. Der Schmelzenraum 4 ist mit einer Abdeckung 7 weitgehend luftdicht abgeschlossen, die die Aufrechterhaltung einer Schutzgasatmosphäre über dem Schmelzenbad ermöglicht.Fig. 1 shows a schematic representation of a two-roll casting plant of the type according to the invention for the continuous production of a steel strip. With its core device for forming the metal strip, the two-roll casting plant consists of two driven casting rolls 1, 2 rotating in opposite directions about horizontal axes, which together with two side plates 3, only one of which is shown in FIG. 1, one Form melt chamber 4 for the reception of molten metal, which is fed from an intermediate vessel 5 via a dip tube 6 into the melt chamber 4 and forms a melt bath there. The melt chamber 4 is largely sealed airtight with a cover 7, which enables a protective gas atmosphere to be maintained above the melt bath.
Die beiden gekühlten Gießwalzen 1, 2 und die an die Stirnseiten der Gießwalzen anliegenden Seitenplatten 3 bilden einen Gießspalt 8, aus dem die zuvor an den Gießwalzenoberflächen in Form von Strangschalen erstarrte Metallschmelze als gegossenes Metallband 9 in vertikaler Gießrichtung ausgefördert und in eine horizontale Transportrichtung umgelenkt mit einem Treibrollengerüst 10 verschiedenen Weiterverarbeitungseinrichtungen in Pfeilrichtung zugeführt wird. Zur Umlenkung des Metallbandes 9 in die horizontale Transportrichtung ist eine schwenkbare kufenförmige Umleiteinrichtung 11 unterhalb des Gießspaltes 8 vorgesehen, die von einer mit dicken Linien dargestellten Einfädelposition, in der das Metallband 9 zum Treibrollengerüst 10 umgeleitet wird, in eine im Wesentlichen vertikale mit strichpunktierten Linien dargestellte Rückzugsposition verschwenkt werden kann. In dieser Rückzugsposition können Bandabschnitte, wie sie insbesondere zu Gießbeginn und am Gießende anfallen, als Schrott vertikal nach unten entsorgt werden.The two cooled casting rolls 1, 2 and the side plates 3 lying against the end faces of the casting rolls form a casting gap 8, from which the metal melt previously solidified on the casting roll surfaces in the form of strand shells is conveyed out as a cast metal strip 9 in the vertical casting direction and deflected in a horizontal transport direction a drive roller stand 10 is fed to various further processing devices in the direction of the arrow. For deflecting the metal strip 9 in the horizontal transport direction, a pivotable skid-shaped diverter 11 is provided below the casting gap 8, which is shown from a threading position shown with thick lines, in which the metal strip 9 is diverted to the drive roller frame 10, into a substantially vertical one with dash-dotted lines Retreat position can be pivoted. In this retracted position, strip sections, such as occur at the start and end of casting, can be disposed of as scrap vertically downwards.
Der Transportweg des Metallbandes 9 vom Austritt aus dem Gießspalt 8 bis zum Eintritt in das Treibrollengerüst 10 ist von einer Einhausung 13 umgrenzt, die üblicherweise von Blechwänden mit einer feuerfesten Auskleidung an deren Innenseite gebildet ist. Im Eintrittsbereich des Metallbandes in die Einhausung 13 sind zwischen der Wandung der Einhausung und den Gießwalzen 1 , 2 bzw. den Seitenplatten 3 nicht dargestellte Dichtungen vorgesehen, wie sie in der österreichischen Patentanmeldung AT-A 303/2002 beschrieben sind. Im Bereich des Treibrollengerüstes 10 schließt an die Einhausung 13 eine ebenfalls mit Schutzgas geflutete Behandlungskammer 14 dichtend an, in der das Metallband auf einem Rollgang 15 weiter transportiert und nicht näher dargestellten Weiterbehandlungseinrichtungen zugeführt wird. Diese können beispielsweise thermische Behandlungen des Metallbandes in einer Bandkantenerhitzungseinrichtung oder in einem Temperaturausgleichsofen oder mechanische Behandlungen des Metallbandes in einer Bandbesäumanlage oder in Walzgerüsten umfassen. Den Boden 16 der Einhausung 13 bildet eine Entleereinrichtung 17 und ist in einem Bereich unterhalb des Gießspaltes 8 von einer Sammelmulde 18 gebildet, in der herabfallende, aus dem Produktionsprozess ausgeschiedene, kurze Bandabschnitte und vom gegossenen Metallband fallweise abfallender Zunder gesammelt werden. Insbesondere das bei Gießbeginn während einer instationären Startphase gebildete Anfahrstück des gegossenen Metallbandes entspricht nicht den geforderten Produktanforderungen und wird daher zumindest teilweise nicht in die horizontale Transportrichtung zur Weiterverarbeitung zum ersten Treibrollengerüst umgelenkt, sondern unmittelbar vertikal nach unten in die Sammelmulde 18 abgeleitet. Die Sammelmulde 18 weist eine wannenförmigen Aufnahme für den Schrott auf und ist mit einem Fahrwerk 19 ausgestattet, welches Fahrräder 20 umfasst, die auf einer von einem horizontalen Längsträger oder einer Schiene gebildeten Fahrbahn 21 abrollen. Über eine an der Sammelmulde angelenkte, ansteuerbare Verschiebeeinrichtung 22, die von einem langhubigen Druckmittelzylinder 23 gebildet ist, ist die Sammelmulde 18 von einer geschlossenen in dicken Linien dargestellte Position für die Aufnahme des Schrottes in eine zurückgezogene geöffnete in strichpunktierten Linien dargestellte Position verlagerbar. Mit einem Räumschwert 27, welches in geringem Abstand oberhalb der Sammelmulde 18 und quer zu ihrer Verschieberichtung angeordnet ist, wird der angesammelte Schrott während der Verschiebebewegung in die geöffnete Position aus der Sammelmulde entfernt und in einen darunter bereitgestellten Schrottsammelbehälter 25 verbracht. Der Schrottsammelbehälter ist in einem Fahrrahmen 28 eingesetzt und kann unabhängig vom laufenden Produktionsprozess an der Zweiwalzengießanlage manipuliert werden.The transport path of the metal strip 9 from the exit from the casting gap 8 to the entry into the drive roller frame 10 is delimited by a housing 13, which is usually formed by sheet metal walls with a refractory lining on the inside. In the entry area of the metal strip into the housing 13, seals, not shown, are provided between the wall of the housing and the casting rolls 1, 2 and the side plates 3, as described in the Austrian patent application AT-A 303/2002. In the area of the drive roller stand 10, the housing 13 is sealed by a treatment chamber 14, likewise flooded with protective gas, in which the metal strip is transported further on a roller table 15 and fed to further treatment devices, not shown. These can include, for example, thermal treatments of the metal strip in a strip edge heating device or in a temperature compensation furnace or mechanical treatments of the metal strip in a strip trimming system or in roll stands. The bottom 16 of the housing 13 forms an emptying device 17 and is formed in an area below the casting gap 8 by a collecting trough 18, in which falling, short strip sections separated from the production process and scale which occasionally falls off from the cast metal strip are collected. In particular, the start-up piece of the cast metal strip formed at the start of casting during an unsteady start phase does not meet the required product requirements and is therefore at least partially not diverted into the horizontal transport direction for further processing to the first drive roller stand, but rather is diverted directly vertically downward into the collecting trough 18. The collecting trough 18 has a trough-shaped receptacle for the scrap and is equipped with a chassis 19 which comprises bicycles 20 which roll on a roadway 21 formed by a horizontal longitudinal member or a rail. Via a hinged, controllable shifting device 22, which is formed by a long-stroke pressure medium cylinder 23, the collecting trough 18 can be displaced from a closed position shown in thick lines for receiving the scrap into a retracted open position shown in dash-dotted lines. With a clearing sword 27, which is arranged at a short distance above the collecting trough 18 and transversely to its direction of displacement, the accumulated scrap is removed from the collecting trough during the displacement movement into the open position and brought into a scrap collecting container 25 provided underneath. The scrap collecting container is inserted in a traveling frame 28 and can be manipulated on the two-roll casting machine independently of the ongoing production process.
Alternativ ist es auch möglich, die Fahrräder 20 mit einem nicht näher dargestellten Fahrantrieb auszustatten.Alternatively, it is also possible to equip the bicycles 20 with a travel drive, not shown in detail.
Damit in weitgehend allen Betriebsphasen der Zweiwalzengießanlage eine möglichst vollständige Abdichtung zwischen der Einhausung 13 und der Sammelmulde 18 oder der Einhausung 13 und dem fahrbaren Schrottsammelbehälter 25 während der Rückzugsbewegung der Sammelmulde sichergestellt ist, ist zwischen diesen Bauteilen ein anstellbares Dichtelement 30 angeordnet. Eine mögliche Ausführungsform ist in Fig. 2 in einem Teilschnitt schematisch dargestellt. Fig. 2 zeigt einen Teilbereich des unteren Endes der Einhausung 13 und die darunter in einem Abstand positionierte Sammelmulde 18 für den Schrott. An der Außenwand 31 der Einhausung bzw. deren Tragkonstruktion ist ein umlaufender Tragflansch 32 für die Befestigung des Dichtelementes 30 angeschweißt. Auf einem Stützblech 33 der Sammelmulde 18, welches eine Dichtfläche bildet, liegt ein Dichtring 34 auf, der in einem Dichtring-Tragrahmen 35 eingelegt und dort befestigt ist. Zwischen dem Tragflansch 32 und dem Dichtring-Tragrahmen 35 ist ein eine Längenänderung zulassendes von einem Faltenbalg 36 gebildetes Verlagerungselement 37 für den Dichtring-Tragrahmen 35 angeordnet, das einerseits am Tragflansch 32 und andererseits am Dichtring-Tragrahmen 35 dichtend befestigt ist. Zwischen dem Tragfiansch 32 und dem Dichtring-Tragrahmen 35 sind an mehreren Stellen, über dem Umfang der Einhausung 13 verteilt, synchron steuerbare Verschiebeeinrichtungen 38, die von Druckmittelzylindern 39 gebildet werden, angeordnet, mit denen der Dichtring 34 an das Stützblech 33 der Sammelmulde 18 in der geschlossenen Position der Sammelmulde angepresst oder von dieser abgehoben werden kann, wenn die Sammelmulde zu ihrer Entleerung in die geöffnete Position verschoben werden soll. Zum Schutz des Faltenbalgs 36 vor thermischer und mechanischer Beschädigung sind zwischen dem Faltenbalg und der Außenwand 31 der Einhausung 13 teleskopisch ineinander schiebbare Schutzbleche 40 sowohl am Tragflansch 32 als auch am Dichtring-Tragrahmen 35 befestigt.In order to ensure as complete a seal as possible between the housing 13 and the collecting trough 18 or the housing 13 and the mobile scrap collecting container 25 during the retraction movement of the collecting trough in largely all operating phases of the two-roll casting installation, an adjustable sealing element 30 is arranged between these components. A possible embodiment is shown schematically in FIG. 2 in a partial section. 2 shows a partial area of the lower end of the housing 13 and the collecting trough 18 for the scrap positioned at a distance below it. A circumferential support flange 32 for fastening the sealing element 30 is welded to the outer wall 31 of the housing or its supporting structure. On a support plate 33 of the trough 18, which forms a sealing surface, there is a sealing ring 34 which is inserted in a sealing ring support frame 35 and fastened there. Between the support flange 32 and the sealing ring support frame 35 there is a displacement element 37 for the sealing ring support frame 35, which allows a change in length and is formed by a bellows 36, which is fastened sealingly on the one hand to the support flange 32 and on the other hand to the sealing ring support frame 35. Between the support flange 32 and the sealing ring support frame 35, synchronously controllable shifting devices 38, which are formed by pressure medium cylinders 39, are arranged at several points, distributed over the circumference of the housing 13, with which the sealing ring 34 is connected to the support plate 33 of the collecting trough 18 in the closed position of the trough can be pressed or lifted from it if the trough is to be moved to its open position for emptying. To protect the bellows 36 from thermal and mechanical damage, fenders 40 which can be telescopically pushed into one another are fastened both on the support flange 32 and on the sealing ring support frame 35 between the bellows and the outer wall 31 of the housing 13.
Der Dichtring 34 ist aus einen elastischem Material wie Gewebe, Fasermaterial und ähnlichem gefertigt. Er kann aber auch durch eine andere Bauart einer Dichtung ersetzt werden, wie beispielsweise eine Sanddichtung, wobei das Stützblech an der Sammelmulde als wannenförmige Aufnahme für Sand ausgebildet ist und an Stelle des Dichtringes ein Dichtblech bei geschlossener Position der Sammelmulde in diese Sandschüttung eintaucht. Das Dichtblech ist wiederum mit einem Verlagerungselement, wie einem Druckmittelzylinder, höhenverstellbar.The sealing ring 34 is made of an elastic material such as fabric, fiber material and the like. But it can also be replaced by another type of seal, such as a sand seal, the support plate on the trough being designed as a trough-shaped receptacle for sand and instead of the sealing ring, a sealing plate is immersed in this sand fill in the closed position of the trough. The sealing plate is in turn adjustable in height with a displacement element, such as a pressure medium cylinder.
Mit derselben Dichtung kann nicht nur eine dichtende Verbindung zwischen der Einhausung und der Sammelmulde, sondern bei geöffneter Position der Sammelmulde auch eine dichtende Verbindung zwischen der Einhausung 13 und dem fahrbaren Schrottsammelbehälter 25 hergestellt werden, wie dies in den Fig. 3 - 5 dargestellt ist. In Fig. 6 ist analog zu Fig. 2 eine weitere Ausführungsform einer möglichst effizienten Abdichtung zwischen der Einhausung 13 und der darunter angeordneten Sammelmulde 18 und dem Schrottsammelbehälter 25 dargestellt. An der Außenwand der Sammelmulde 13 sind zwei voneinander unabhängig betätigbare Dichtelemente 30, 30a befestigt, wobei das Dichtelement 30, wie in Bezug auf Fig. 2 beschrieben, eine dichte Verbindung zur Sammelmulde 18 und das konzentrisch zu diesem Dichtelement 30 angeordnete weitere Dichtelement 30a eine dichte Verbindung zum Schrottsammelbehälter 25 herstellt. Der konstruktive Aufbau der beiden Dichtelemente 30, 30a ist identisch und entspricht den Ausführungen zu Fig. 2. Jedes andere gleichwirkende Dichtelement kann gleichermaßen eingesetzt werden. Durch diese doppelte Anordnung bleibt während aller Betriebsfälle stets eine dichtende Verbindung, entweder zur Sammelmulde 18 oder an zumindest drei Seiten zum Schrottsammelbehälter 25 bestehen.With the same seal, not only a sealing connection between the housing and the collecting trough, but also with the opening position of the collecting trough also a sealing connection between the housing 13 and the mobile scrap collecting container 25 can be produced, as is shown in FIGS. 3-5. 6, analogously to FIG. 2, a further embodiment of the most efficient possible seal between the housing 13 and the collecting trough 18 arranged underneath it and the scrap collecting container 25 is shown. On the outer wall of the trough 13, two independently operable sealing elements 30, 30a are fastened, the sealing element 30, as described in relation to FIG. 2, providing a tight connection to the collecting trough 18 and the further sealing element 30a arranged concentrically with this sealing element 30 Connects to the scrap container 25. The construction of the two sealing elements 30, 30a is identical and corresponds to the explanations for FIG. 2. Any other sealing element with the same effect can be used in the same way. As a result of this double arrangement, a sealing connection always remains, either to the collecting trough 18 or to the scrap collecting container 25 on at least three sides during all operating cases.
In den Fig. 3 bis 5 ist die erfindungsgemäße Anordnung der Einhausung 13, der Sammelmulde 18 und des Schrottsammelbehälters 25 zueinander in drei charakteristischen Betriebsfällen veranschaulicht. Die Sammelmulde 18 ist hier wannenförmig, doppelwandig und wassergekühlt ausgeformt und mit Sand gefüllt.3 to 5, the arrangement according to the invention of the housing 13, the collecting trough 18 and the scrap collecting container 25 to one another is illustrated in three characteristic operating cases. The trough 18 here is trough-shaped, double-walled and water-cooled and filled with sand.
In Fig. 3 ist ein Betriebsfall veranschaulicht, wie er in der Anfahrphase des Gießprozesses auftritt. Die Schrottmulde 18 ist in die geöffnete Position verschoben, sodass die Einhausung 13 zum Schrottsammelbehälter 25 offen ist und herabfallende Bandteile direkt in den Schrottsammelbehälter fallen. Das die Einhausung 13 allseitig umfassende Dichtelement 30 liegt mit seinem Dichtring 34 auf dem Stützblech 33 des Schrottsammelbehälters 25 auf und befindet sich in seiner tiefsten Einsatzposition und schließt den Spaltraum zwischen der Einhausung und dem Schrottsammelbehälter dichtend ab.3 illustrates an operating case as it occurs in the start-up phase of the casting process. The scrap trough 18 is moved into the open position, so that the housing 13 to the scrap collection container 25 is open and falling strip parts fall directly into the scrap collection container. The sealing element 30 encompassing the housing 13 on all sides rests with its sealing ring 34 on the support plate 33 of the scrap collecting container 25 and is in its deepest operating position and seals the gap between the housing and the scrap collecting container.
In Fig. 4 ist ein Betriebsfall veranschaulicht, bei dem die Sammelmulde 18 die geschlossene Position unterhalb der Einhausung 13 einnimmt und das Dichtelement 30 mit seinem Dichtring 34 auf dem Stützblech 33 der Sammelmulde 18 aufliegt. Allenfalls herabfallender Schrott und Zunder werden in der Sammelmulde gesammelt bis der Schrottsammelbehälter 25 nach seiner Entleerung wieder seine Aufnahmeposition unterhalb der geschlossenen Sammelmulde einnimmt. Während dieser geschlossenen Position der Sammelmulde 18 kann der Schrottsammelbehälter 25 ohne Beeinträchtigung des Produktionsprozesses auf der Zweiwalzengießanlage jederzeit zu seiner Entleerung kurzzeitig aus der Anlage gefahren werden.4 illustrates an operating case in which the collecting trough 18 assumes the closed position below the housing 13 and the sealing element 30 with its sealing ring 34 rests on the support plate 33 of the collecting trough 18. Any scrap and scale falling down are collected in the trough until the scrap collection container 25 returns to its receiving position below the closed trough after it has been emptied. During this closed position of the collection trough 18, the scrap collection container 25 can be operated without impairment of the production process on the two-roll casting system can be briefly driven out of the system at any time to empty it.
Fig. 5 veranschaulicht den Betriebsfall, in dem angesammelter Schrott aus der Sammelmulde 18 in den Schrottsammelbehälter umgeleert wird. Nach dem Hochfahren des Dichtelementes 30, Welches den Spalt zwischen der Einhausung 13 und der Sammelmulde 18 luftdicht abschließt, in eine Freigabeposition, wird die Sammelmulde 18 durch eine Querbewegung in ihre geöffnete Position verbracht und gleichzeitig in der Sammelmulde angesammelter Schrott mit dem Räumschwert 27 in den Schrottsammelbehälter geschoben. Sobald die Sammelmulde die geöffnete Position erreicht hat, wird das Dichtelement 30 auf dem Schrottsammelbehälter aufgesetzt. Bei einem entlang seiner Umfangserstreckung segmentierten Dichtelement, können einzelne Segmente unmittelbar nach dem Wegbewegen der Sammelmulde auf dem Schrottsammelbehälter aufgesetzt werden.FIG. 5 illustrates the operating case in which accumulated scrap is emptied from the collection trough 18 into the scrap collection container. After the sealing element 30, which closes the gap between the housing 13 and the collecting trough 18 in an air-tight manner, is raised into a release position, the collecting trough 18 is brought into its open position by a transverse movement and, at the same time, scrap collected with the clearing sword 27 in the collecting trough is collected in the collecting trough Scrap container pushed. As soon as the collection trough has reached the open position, the sealing element 30 is placed on the scrap collection container. With a sealing element segmented along its circumferential extent, individual segments can be placed on the scrap collection container immediately after the collection trough has been moved away.
Die auf dem Transportweg des gegossenen Metallbandes der Einhausung 13 unmittelbar nachfolgende Behandlungskammer 14 kann ebenfalls mit Schutzgas geflutet werden. Wie aus Fig. 1 zu entnehmen ist, ist der Boden dieser Behandlungskammer 14 unterhalb der von einem Rollgang gebildeten Bandtransporteinrichtung 15, auf dem das noch heiße Metallband transportiert wird, mit zwei entleerbaren, trichterförmigen Sammelbehältern 41 mit Verschlussklappen 43 ausgestattet, die durch Druckmittelzylinder 42 geöffnet und geschlossen werden können. Ein mit einer Fahrsteuerung ausgestatteter Schrottsammelbehälter 25 kann in Abfolge sowohl die Entleerposition unterhalb der geschlossenen Sammelmulde 18 als auch einzelne Entleerpositionen unterhalb der Verschlussklappen 43 anfahren, die nach Einnahme der jeweiligen Entleerposition geöffnet werden. Die einzelnen Entleerpositionen sind durch Schleifkontakte oder Lichtschranken festgelegt. The treatment chamber 14 immediately following on the transport path of the cast metal strip of the housing 13 can also be flooded with protective gas. As can be seen from FIG. 1, the bottom of this treatment chamber 14 below the belt transport device 15 formed by a roller table, on which the still hot metal belt is transported, is equipped with two emptied, funnel-shaped collecting containers 41 with closure flaps 43, which are opened by pressure medium cylinders 42 and can be closed. A scrap collecting container 25 equipped with a driving control can move to the emptying position below the closed collecting trough 18 as well as individual emptying positions below the closing flaps 43, which are opened after the respective emptying position has been assumed. The individual emptying positions are determined by sliding contacts or light barriers.

Claims

Patentansprüche: claims:
1. Zweiwalzengießanlage mit zwei um horizontale Achsen gegensinnig rotierende Gießwalzen (1 , 2), mit einem Gießspalt (8) für die Bildung und das Ausfördern eines dünnen gegossenen Metallbandes (9), mit einer abgedichteten Einhausung (13), die einen Boden (16) aufweist und die den Transportweg des den Gießspalt verlassenden Metallbandes von einer vertikalen Gießrichtung in eine annähernd horizontale Transportrichtung umgrenzt, mit Umleiteinrichtungen (11 ) für das Metallband in dieser Einhausung (13) und mit einem verfahrbaren Schrottsammelbehälter (25) zum Abtransport von anfallendem Schrott und Zunder aus der Zweiwalzengießanlage, dadurch gekennzeichnet, dass der Boden (16) der Einhausung (13) zumindest in einem Teilbereich eine Sammelmulde (18) für den Schrott bildet, die Teil einer Entleereinrichtung (17) ist, und dass ein verfahrbarer Schrottsammelbehälter (25) in einer Aufnahmeposition unterhalb der Entleereinrichtung (17) angeordnet ist.1. Two-roll casting machine with two casting rolls (1, 2) rotating in opposite directions about horizontal axes, with a casting gap (8) for the formation and removal of a thin cast metal strip (9), with a sealed housing (13) which has a bottom (16 ) and which delimits the transport path of the metal strip leaving the casting gap from a vertical casting direction into an approximately horizontal transport direction, with diversion devices (11) for the metal strip in this housing (13) and with a movable scrap collecting container (25) for the removal of scrap and Tinder from the two-roll caster, characterized in that the bottom (16) of the housing (13) forms a collection trough (18) for the scrap, which is part of an emptying device (17), at least in a partial area, and that a movable scrap collection container (25) is arranged in a receiving position below the emptying device (17).
2. Zweiwalzengießanlage nach Anspruch 1 , dadurch gekennzeichnet, dass die Sammelmulde (18) für den Schrott zwischen einer geschlossenen und einer geöffneten Position verlagerbar ausgebildet und mit einer VerStelleinrichtung (22) gekoppelt ist und dass der Einhausung (13) ein Dichtelement (30) zur Abdichtung eines Spaltes zwischen der Einhausung (13) und der Sammelmulde (18) in der geschlossenen Position zugeordnet ist.2. Two-roll caster according to claim 1, characterized in that the collecting trough (18) for the scrap is designed to be displaceable between a closed and an open position and is coupled to an adjusting device (22) and that the housing (13) has a sealing element (30) Sealing a gap between the housing (13) and the collecting trough (18) is assigned in the closed position.
3. Zweiwalzengießanlage nach Anspruch 2, dadurch gekennzeichnet, dass das Dichtelement (30) an der Einhausung (13) befestigt ist und in der geschlossenen Position der Sammelmulde (18) an diese anpressbar ausgebildet ist. 3. Two-roll casting plant according to claim 2, characterized in that the sealing element (30) is fastened to the housing (13) and in the closed position of the collecting trough (18) is designed such that it can be pressed against it.
4. Zweiwalzengießanlage nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass das Dichtelement (30) einen zur Einhausung (13) und zur Sammelmulde (18) relativbeweglichen und an die Sammelmulde anpressbaren Dichtring (34) umfasst, der von einem an der Einhausung angreifenden und an ihr befestigten Verlagerungselement (37), beispielsweise einem Faltenbalg (36), getragen ist, und der mit einer steuerbaren Verschiebeeinrichtung (38), beispielsweise einem an der Einhausung (13) angelenkten Druckmittelzylinder(39), gekoppelt ist.4. Two-roll caster according to claim 2 or 3, characterized in that the sealing element (30) comprises a sealing ring (34) which is relatively movable with respect to the housing (13) and the collecting trough (18) and can be pressed onto the collecting trough, said sealing ring (34) acting on the housing and on its attached displacement element (37), for example a bellows (36), and which is coupled to a controllable displacement device (38), for example a pressure medium cylinder (39) articulated on the housing (13).
5. Zweiwalzengießanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Sammelmulde (18) ein Fahrwerk (19) aufweist und diesem Fahrwerk eine Fahrbahn (21 ) zugeordnet ist.5. Two-roll casting plant according to one of the preceding claims, characterized in that the collecting trough (18) has a carriage (19) and this carriage is assigned a carriageway (21).
6. Zweiwalzengießanlage nach einem der Ansprüche I bis 4, dadurch gekennzeichnet, dass die Sammelmulde Gleitelemente aufweist und diesen Gleitelementen eine stationäre Gleitbahn zugeordnet sind.6. Two-roll casting plant according to one of claims I to 4, characterized in that the collecting trough has sliding elements and these sliding elements are assigned a stationary slideway.
7. Zweiwalzengießanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass im Abstand von der Sammelmulde (18) an der Einhausung (13) ein Räumschwert (27) zum Abstreifen des angesammelten Schrottes angeordnet ist.7. Two-roll caster according to one of the preceding claims, characterized in that a clearing sword (27) for stripping the accumulated scrap is arranged at a distance from the collecting trough (18) on the housing (13).
8. Zweiwalzengießanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein der Einhausung (13) zugeordnetes Dichtelement (30) bei geöffneter Position der Sammelmulde (18) an den fahrbaren Schrottsammelbehälter (25) in seiner Aufnahmeposition anpressbar ausgebildet ist.8. Two-roll casting plant according to one of the preceding claims, characterized in that a sealing element (30) assigned to the housing (13) is designed to be able to be pressed against the mobile scrap container (25) in its receiving position when the collecting trough (18) is in the open position.
9. Zweiwalzengießanlagen nach einem der vorhergehenden Ansprüche 1 bis 7, dadurch gekennzeichnet, dass ein der Einhausung (13) zugeordnetes Dichtelement (30) während des öffnens der Sammelmulde (18) kontinuierlich oder mit Teilabschnitten an den fahrbaren Schrottsammelbehälter (25) in seiner Aufnahmeposition anpressbar ausgebildet ist.9. Two-roll casting system according to one of the preceding claims 1 to 7, characterized in that a sealing element (30) assigned to the housing (13) can be pressed continuously or with partial sections onto the movable scrap container (25) in its receiving position during the opening of the collecting trough (18) is trained.
10. Zweiwalzengießanlage nach einem der vorhergehenden Ansprüche 1 bis 9, dadurch gekennzeichnet, dass der Einhausung (13) ein Dichtelement (30) zugeordnet ist, welches bei geschlossener Position der Sammelmulde (18) an diese und bei geöffneter Position der Sammelmulde (18) an den fahrbaren Schrottsammelbehälter (25) anpressbar ausgebildet ist.10. Two-roll casting plant according to one of the preceding claims 1 to 9, characterized in that the housing (13) has a sealing element (30) is assigned, which is designed to be capable of being pressed against the collecting trough (18) when the collecting trough (18) is closed and against the mobile scrap collecting container (25) when the collecting trough (18) is open.
11. Zweiwalzengießanlage nach einem der vorhergehenden Ansprüche 1 bis 9, dadurch gekennzeichnet, dass der Einhausung (13) zwei voneinander unabhängige Dichtelemente (30, 30a) zugeordnet sind, wobei eines dieser Dichtelemente (30) bei geschlossener Position der Sammelmulde (18) an diese und das zweite Dichtelement (30a) an den fahrbaren Schrottsammelbehälter (25) anpressbar ausgebildet ist.11. Two-roll casting plant according to one of the preceding claims 1 to 9, characterized in that the housing (13) is assigned two mutually independent sealing elements (30, 30a), one of these sealing elements (30) when the collecting trough (18) is in a closed position and the second sealing element (30a) is designed such that it can be pressed against the mobile scrap collecting container (25).
12. Zweiwalzengießanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der fahrbare Schrottsammelbehälter (25) in seiner Aufnahmeposition in einer geschlossenen Schrottkammer positioniert ist, die unterhalb der Einhausung dichtend an diese anschließt.12. Two-roll caster according to one of the preceding claims, characterized in that the mobile scrap collection container (25) is positioned in its receiving position in a closed scrap chamber, which connects to the housing in a sealing manner below it.
13. Zweiwalzengießanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass, dem Transportweg des gegossenen Metallbandes (9) folgend, an die Einhausung (13) eine Behandlungskammer (14) mit einer Bandtransporteinrichtung (15) und gegebenenfalls weitere Bandbehandlungseinrichtungen für das Metallband anschließen und der Boden dieser Behandlungskammer (14) von mindestens einem entleerbaren Sammelbehälter (41 ) für Zunder und gegebenenfalls Schrott gebildet ist.13. Two-roll casting plant according to one of the preceding claims, characterized in that, following the transport path of the cast metal strip (9), connect a treatment chamber (14) with a strip transport device (15) and optionally further strip treatment devices for the metal strip to the housing (13) and the bottom of this treatment chamber (14) is formed by at least one emptying collecting container (41) for scale and possibly scrap.
14. Zweiwalzengießanlage nach Anspruch 13, dadurch gekennzeichnet, dass der Sammelbehälter (41) als Sammelmulde mit einer Verschiusseinrichtung (43) ausgebildet ist.14. Two-roll casting plant according to claim 13, characterized in that the collecting container (41) is designed as a collecting trough with a closing device (43).
15. Zweiwalzengießanlage nach Anspruch 13 oder 14, dadurch gekennzeichnet, dass unterhalb des Sammelbehälters (41 ) eine oder mehrere Aufnahmepositionen für einen verfahrbaren Schrottsammelbehälter (25) vorgesehen sind.15. Two-roll casting plant according to claim 13 or 14, characterized in that one or more receiving positions for a movable scrap collecting container (25) are provided below the collecting container (41).
16. Zweiwalzengießanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der verfahrbare Schrottsammelbehälter (25) mit einer Fahrsteuerung ausgestattet ist, die ein gesteuertes Anfahren aller Aufnahmepositionen unterhalb des Transportweges des Metallbandes ermöglicht.16. Two-roll casting plant according to one of the preceding claims, characterized in that the movable scrap collecting container (25) with a Driving control is equipped, which enables a controlled approach to all shooting positions below the transport path of the metal belt.
17. Verfahren zur Einleitung eines Gießprozesses unter Verwendung einer Zweiwalzengießanlage nach einem der Ansprüche 1 bis 16, wobei zwei um horizontale Achsen gegensinnig rotierende Gießwalzen (1 , 2) und an diese anpressbare Seitenplatten (3) einen Schmelzenraum (4) für die Aufnahme von Metallschmelze und einen Gießspalt (8) für die Formgebung eines gegossenen Metallstranges bilden, wobei Metallschmelze in den Schmelzenraum (4) kontinuierlich oder nach einer vorgegebenen Anfahrkurve eingebracht wird und ein gegossenes Metallband aus dem Gießspalt kontinuierlich oder nach einer vorgegebenen Anfahrkurve ausgefördert wird, dadurch gekennzeichnet, dass ein in einer instationären Startphase gegossenes erstes Teilstück des Metallbandes bei einer in eine Rückzugsposition verschwenkten Umleiteinrichtung (11 ) und bei einer in eine zurückgezogene geöffnete Position verlagerte Sammelmulde (18) in im Wesentlichen vertikaler Richtung direkt in den Schrottsammelbehälter gefördert wird, dass mit Erreichen einer stationären Betriebsphase das erste Teilstück des gegossenen Metallbandes, vorzugsweise im Gießspalt, abgetrennt wird, dass anschließend die Umleiteinrichtung (11 ) in die Einfädelposition verschwenkt wird und dass das nachfolgende gegossene Metallband in eine im Wesentlichen horizontale Transportrichtung geleitet wird und anschließend oder gleichzeitig die Sammelmulde in die geschlossene Position verlagert wird. 17. A method for initiating a casting process using a two-roll casting system according to one of claims 1 to 16, wherein two casting rolls (1, 2) rotating in opposite directions about horizontal axes and side plates (3) which can be pressed against them, a melt chamber (4) for the reception of molten metal and form a casting gap (8) for the shaping of a cast metal strand, metal melt being introduced into the melt space (4) continuously or according to a predetermined start-up curve and a cast metal strip being conveyed out of the casting gap continuously or according to a predetermined start-up curve, characterized in that a first section of the metal strip, which is cast in an unsteady starting phase, is conveyed directly into the scrap collecting container in a substantially vertical direction with a diverting device (11) pivoted into a retracted position and with a collecting trough (18) displaced into a retracted open position is that when a stationary operating phase is reached, the first section of the cast metal strip, preferably in the casting gap, is cut off, that the diverter device (11) is then pivoted into the threading position and that the subsequent cast metal strip is guided in a substantially horizontal transport direction and then or at the same time the collection bin is moved to the closed position.
EP04728773A 2003-05-06 2004-04-22 Twin roll casting plant Expired - Lifetime EP1620217B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0067803A AT412539B (en) 2003-05-06 2003-05-06 Two-roll casting
PCT/EP2004/004264 WO2004098814A1 (en) 2003-05-06 2004-04-22 Twin roll casting plant

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EP1620217A1 true EP1620217A1 (en) 2006-02-01
EP1620217B1 EP1620217B1 (en) 2006-12-13

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US (1) US7156150B2 (en)
EP (1) EP1620217B1 (en)
KR (1) KR101209825B1 (en)
CN (1) CN100534668C (en)
AT (2) AT412539B (en)
AU (1) AU2004235896B2 (en)
DE (1) DE502004002305D1 (en)
MX (1) MXPA05011789A (en)
WO (1) WO2004098814A1 (en)

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CN102015155B (en) * 2008-03-19 2013-11-27 纽科尔公司 Strip casting apparatus with casting roll positioning
US20090236068A1 (en) 2008-03-19 2009-09-24 Nucor Corporation Strip casting apparatus for rapid set and change of casting rolls
US20090288798A1 (en) * 2008-05-23 2009-11-26 Nucor Corporation Method and apparatus for controlling temperature of thin cast strip
US7888158B1 (en) * 2009-07-21 2011-02-15 Sears Jr James B System and method for making a photovoltaic unit
JP5669006B2 (en) * 2010-10-19 2015-02-12 日本電気硝子株式会社 Strip glass film manufacturing method and strip glass film manufacturing apparatus
KR101657775B1 (en) * 2014-10-08 2016-09-20 주식회사 포스코 Metal fiber discharging apparatus
WO2016013729A1 (en) * 2014-07-21 2016-01-28 주식회사 포스코 Metal fiber manufacturing system
CN105710320B (en) * 2015-12-31 2018-01-19 安泰科技股份有限公司 The collection device of scratch tape in amorphous band preparation process
CN106735030B (en) * 2017-01-17 2020-01-10 中冶华天工程技术有限公司 Iron scale collecting device and method for casting blank hot conveying system
WO2018152738A1 (en) * 2017-02-23 2018-08-30 普锐特冶金技术日本有限公司 Apparatus for continuous casting of thin sheet
CN110170626B (en) * 2019-06-20 2024-02-06 中冶赛迪工程技术股份有限公司 Casting-rolling precooling pouring device
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Publication number Publication date
US7156150B2 (en) 2007-01-02
CN1784279A (en) 2006-06-07
ATA6782003A (en) 2004-09-15
KR101209825B1 (en) 2012-12-07
US20060118270A1 (en) 2006-06-08
AU2004235896B2 (en) 2009-12-03
KR20060011852A (en) 2006-02-03
EP1620217B1 (en) 2006-12-13
WO2004098814A1 (en) 2004-11-18
CN100534668C (en) 2009-09-02
MXPA05011789A (en) 2006-01-26
AT412539B (en) 2005-04-25
AU2004235896A1 (en) 2004-11-18
ATE347951T1 (en) 2007-01-15
DE502004002305D1 (en) 2007-01-25

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