EP0244354B1 - Mehrteilige Giessdüse zum Einführen von Metallschmelze in den Giessraum einer Stranggiessmaschine - Google Patents

Mehrteilige Giessdüse zum Einführen von Metallschmelze in den Giessraum einer Stranggiessmaschine Download PDF

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Publication number
EP0244354B1
EP0244354B1 EP87810241A EP87810241A EP0244354B1 EP 0244354 B1 EP0244354 B1 EP 0244354B1 EP 87810241 A EP87810241 A EP 87810241A EP 87810241 A EP87810241 A EP 87810241A EP 0244354 B1 EP0244354 B1 EP 0244354B1
Authority
EP
European Patent Office
Prior art keywords
mouthpiece
casting
nozzle according
casting nozzle
distribution bar
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87810241A
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German (de)
English (en)
French (fr)
Other versions
EP0244354A2 (de
EP0244354A3 (en
Inventor
Wilhelm Friedrich Lauener
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.)
Larex AG
Original Assignee
Larex AG
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 Larex AG filed Critical Larex AG
Priority to AT87810241T priority Critical patent/ATE51172T1/de
Publication of EP0244354A2 publication Critical patent/EP0244354A2/de
Publication of EP0244354A3 publication Critical patent/EP0244354A3/de
Application granted granted Critical
Publication of EP0244354B1 publication Critical patent/EP0244354B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/064—Accessories therefor for supplying molten metal
    • B22D11/0642—Nozzles

Definitions

  • the invention relates to a casting nozzle composed of several parts for introducing the metal melt from a melt container into the casting room of a continuous casting machine with rotating molds.
  • a known type of this casting machine has two opposing, endless metal strips which serve as molds, which are guided, tensioned and driven by deflection rollers before and after the casting space.
  • the belts are intensively cooled on the outside in order to dissipate the heat absorbed by the cast material.
  • the mold is formed by mutually arranged metal blocks, which are moved in a certain orbit by means of a drive, so that they form the mold lying closely together over the length of the casting section.
  • the heat absorbed by the melt is dissipated either by internal or external cooling of the mold blocks.
  • the casting chamber is sealed laterally by moving dams.
  • a third type of continuous casting machine consists of a so-called casting wheel, which has a depression corresponding to the desired strand dimension to be cast, so that three sides of the casting chamber are formed with the edges of the depression on both sides.
  • the fourth side is now formed by a metal band or mold band resting on the edges and partially wrapping around the wheel rim. If the casting wheel is rotated, the mold belt runs along with it, creating a mold that moves with the cast material.
  • the molten metal is fed from a melt container into the casting space in the direction of the mold movement by means of a feed device.
  • a feed device So-called open or closed feed systems are used. If high demands are placed on the quality of the cast strand, only a closed feed system can be used.
  • a so-called pouring nozzle is used to supply the melt from a melt container, which protrudes into the casting chamber and closes it backwards.
  • the melt container with the pouring nozzle attached to it usually has to be positioned very precisely, which is extremely difficult due to the occurring temperatures and the associated thermal expansions of the holders and supports of the melt container and requires laborious measures, such as the installation of an articulated intermediate piece between the melt container and the nozzle holder, since uneven coefficients of thermal expansion of the parts lead to considerable problems.
  • the present invention now relates to a multi-part casting nozzle, the components of which are simple to manufacture and can be replaced individually, with which the operating costs of a casting installation can be further reduced, in particular if relatively wide strands have to be cast.
  • the solution to this problem is specified in the characterizing part of claim 1.
  • the nozzle preferably has a distribution bar on the inlet side.
  • This nozzle now has sufficient mobility to center itself in the casting chamber during temperature-related displacements of the melt container during operation, without causing an inadmissibly high friction when the nozzle tip touches the moving mold wall. With a considerable strand width, the nozzle mouthpiece can expand or shrink unhindered and independent of the melt container, since the individual tubes can follow any changed position of the end face contact surfaces unhindered.
  • the design according to the invention enables the simple production of casting nozzles even for the largest strand widths and any practically required nozzle length, which is particularly advantageous in the case of casting machines with a casting chamber located relatively deep in the machine.
  • the distribution strip or the melting container and the mouthpiece for the flow of the melt have matching bores, each bore of the distribution strip or the melting container being connected by a pipe to the corresponding bore of the mouthpiece, a solution for connecting the different parts to one another consists in the fact that between said bores in the mouthpiece there are transverse bores with inserted bolts, in which at least one tie rod is anchored and non-positively connected to the distribution bar with the interposition of an elastic element, so that a force acts on the end face of the pipes, thereby ensuring a seal becomes.
  • tie rods cross the mouthpiece.
  • the tie rods have a head at the end, through which the mouthpiece is drawn sealingly against the connecting pipes.
  • a pouring nozzle in which a connecting part composed of individual flat tubes is arranged between the mouthpiece and the melt container, the connecting tubes having channels for receiving electrical heating elements (GB-A-2 013 855).
  • the connecting tubes having channels for receiving electrical heating elements (GB-A-2 013 855).
  • a pouring nozzle is also known, which is divided into individual tubes. Between adjacent pipes there are support bodies in which electrical heating elements are installed (GB-A-2 140 721). Further details on the structure of the pouring nozzle are missing. The task and solution on which the invention is based were also not available here.
  • the design according to the invention is particularly suitable, since it offers the possibility of assembling the body of the nozzle mouthpiece from different materials.
  • Thin-walled protective sleeves can be inserted into the holes through which the melt flows and the outlet side of the nozzle can be covered with a protective strip.
  • the tie rods are advantageously anchored in the protective strip so that it rests firmly on the mouthpiece body.
  • a heat-insulating seal can also be provided between the mouthpiece body and the protective strip. For manufacturing or other reasons, it is also possible to subdivide the protective strip in the direction of the casting width.
  • the protective sleeves in the flow bores of the distribution bar and the mouthpiece of the nozzle and for covering the discharge sides thereof a material is provided which can withstand attack by the melt.
  • the distribution bar and the mouthpiece can be made from graphite, and bomitride can be provided for the protective sleeves and the protective bar.
  • a ceramic material for the part of the pull rods leading through the mouthpiece, this part being able to be connected outside of the mouthpiece to the metallic part of the pull rod by means of a cement or another known type.
  • a threaded sleeve can also be cemented onto the ceramic part of the tie rods, into which the metallic part of the tie rods is screwed.
  • the pull rod is preferably fastened to a yoke located between two tubes and in the vicinity of the distributor bar, which yoke is pressed or pressed against the distributor bar on both sides of the tube.
  • a resilient seal made of ceramic fiber material can be provided on one or both sides. It can be advantageous to arrange two tie rods per bolt, especially with a round cross section of the pipes.
  • the clamping means engage on the outside, on the side surfaces of the mouthpiece, which complicates a narrow, slim design of the pouring nozzle.
  • the present invention is also based on the object of enabling a particularly slim or narrow design of the pouring nozzle and thus of the cast strip. The solution is given in claims 9 and 10. Since the clamping devices enter the mouthpiece on the rear end, a narrow, slim design is not made more difficult by clamping devices acting on the outside.
  • the connecting part could also be made in one piece, in which case pull rods can lie in grooves on the side surfaces of the connecting part.
  • the pouring nozzle shown in FIGS. 1-5 essentially consists of a strip-like, elongated mouthpiece 1, a likewise elongated distribution bar 2 and tubes 3 arranged between these two parts.
  • the pouring nozzle projects between two rollers 4 and 5 into the continuous casting machine.
  • a mold belt 6 and 7 is guided over each of these two rollers 4 and 5.
  • These mold belts run over another, similar pair of rollers and are operated by these rollers at a certain speed corresponding to the casting speed driven. Together with side dams and the mouthpiece 1, they form a casting space 8, in which the metal flowing in through the casting nozzle solidifies and emerges as a casting strip between the mold strips 6 and 7.
  • a housing 10 is also indicated in dash-dotted lines, in which cooling and support devices for the mold belts are arranged.
  • the mouthpiece 1 has a series of continuous bores 11 which are connected on one side to the tubes 3 on the flat end face 12 and on the other side preferably open into a groove which is continuous over the entire casting width but is closed at both ends, as a result of which a uniform flow and distribution of the melt at the entrance to the casting room 8 is favored.
  • the distribution bar 2 also has through bores 14, the number and mutual distance of which corresponds to that of the bores 11 of the mouthpiece 1. So there are the same number of holes in the same mutual spacing in both parts.
  • the distribution bar 2 is connected in a manner described in more detail later with the bottom or a nozzle 17 of a melt container with the interposition of a heat-resistant seal 18. In the bottom or nozzle 17, the holes 14 corresponding to and communicating with the same exit holes 19 are provided.
  • the parts 1, 2 and 3 of the pouring nozzle are mutually somewhat movable but nevertheless securely connected to one another by pairs of tie rods 20, which each run between two adjacent tubes 3.
  • pairs of tie rods 20 which each run between two adjacent tubes 3.
  • the tie rods 20a pass through the mouthpiece 1, which, as shown in FIG. 6, can be composed of different building materials.
  • the tie rods 20a have heads 31 and are anchored in the protective strip 29, so that it is pressed in a sealing manner against the body 1 of the mouthpiece and is thus held.
  • a heat-resistant, heat-insulating seal 30 is placed between the body 1 of the mouthpiece and the protective strip 29.
  • the holes 11 through which the melt flows can be provided with a protective sleeve 28 (FIG. 7).
  • Graphite can advantageously be used for the nozzle body 1.
  • the protective sleeves 28 and the protective strip 29 consist of a material that withstands attack by the melt. Boron nitride is preferably used for this.
  • a heat-resistant, ceramic material at least for the part of the tension rod 20a which passes through the mouthpiece.
  • a material based on aluminum oxide can preferably be provided for this.
  • the connection to the metallic part 20 of the pull rod can be made in a known manner.
  • a metallic threaded sleeve 32 can be fastened with cement on the ceramic part 20a and the metallic part 20 can be screwed into the sleeve.
  • the other ends of the tie rods 20 project through bores each of an associated yoke 22 and are anchored to this yoke by heads 23.
  • Each yoke 22 is in turn anchored to the distribution bar 2 by means of two screws 24 and two compression springs 25.
  • the compression springs 25 tension the mouthpiece 1 or the distribution bar 2 elastically against the ends of the tubes 3, such that these parts are securely clamped against one another in the longitudinal direction, but are somewhat movable transversely to the direction of pull and can therefore adapt.
  • a certain elasticity and possibility of adjustment in the longitudinal or tensile direction is given by the elasticity of the seals 15, 16 and 18.
  • the tension of the tie rods can be achieved by any arrangement of the springs.
  • tension springs acting between the distributor bar 2 and the yokes 22 can also be provided, in which case the distance of the yokes 22 from the distributor bar 2 must of course be greater.
  • the anchoring means for such tension springs on the distribution bar 2 or on the yokes 22 can be made adjustable in the direction of tension in order to preselect or adjust the spring force.
  • the distribution bar 2 and thus the entire pouring nozzle, is also elastically anchored to the melt container.
  • tie rods 26 are screwed to the bottom or socket 17 of the melt container, on which pressure springs 27 are supported, which press the distribution strip 2 against the bottom or socket 17 of the melt container.
  • a pull rod 26 with spring 27 is shown only at one point, but a pair of pull rods 26 and springs 27 are provided in the region of each tube 3 (Fig. 4).
  • the tubes 3 lie as closely as possible to one another, but in such a way that there is still sufficient space for the tie rods 20 and the yoke 22 lying between them.
  • An exemplary embodiment for casting aluminum strip with a thickness of 25 mm has the following characteristic data:
  • the nozzle mouthpiece 1 consists of a ceramic that cannot be wetted by aluminum.
  • the rectangular tubes 3 with a clear width of 21 x 16 mm and a wall thickness of 3.5 mm are made of aluminum titanate. Cast iron is preferably used for the distribution bar 2, in which case the flow bores 14 are provided with an insulating ceramic lining (not shown).
  • a heat-resistant steel is provided for these parts and the material Nimonic for the springs 25 and 27.
  • the tie rods 20 have a diameter of 3 mm and the tie rods 24 and 26 have a diameter of 6 mm.
  • the preload of the springs 25 is 120 N and that of the springs 27 is 200 N.
  • the length of the mouthpiece 1 measures 55 mm
  • the length of the tubes 3 is 500 mm
  • the thickness of the distributor bar 30 mm which means a total length of the nozzle of 585 mm results. It is obvious that other materials, dimensions and prestressing forces can also be provided depending on the requirements.
  • the tubes 3 are available from specialist dealers in all the necessary cross sections, and these, too, treated with the necessary care, can be in operation several times and over a long period of time. If necessary, the pipes can be replaced individually.
  • the entire unit can be fastened to or removed from the melt container by means of known types of fastening, including quick couplings.
  • the nozzle on the casting machine can therefore be replaced in the shortest possible time.
  • the design according to the invention also has significant operational advantages over known solutions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
EP87810241A 1986-04-30 1987-04-16 Mehrteilige Giessdüse zum Einführen von Metallschmelze in den Giessraum einer Stranggiessmaschine Expired - Lifetime EP0244354B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87810241T ATE51172T1 (de) 1986-04-30 1987-04-16 Mehrteilige giessduese zum einfuehren von metallschmelze in den giessraum einer stranggiessmaschine.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH1787/86 1986-04-30
CH178786 1986-04-30
CH341186 1986-08-25
CH3411/86 1986-08-25

Publications (3)

Publication Number Publication Date
EP0244354A2 EP0244354A2 (de) 1987-11-04
EP0244354A3 EP0244354A3 (en) 1988-03-23
EP0244354B1 true EP0244354B1 (de) 1990-03-21

Family

ID=25688672

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87810241A Expired - Lifetime EP0244354B1 (de) 1986-04-30 1987-04-16 Mehrteilige Giessdüse zum Einführen von Metallschmelze in den Giessraum einer Stranggiessmaschine

Country Status (8)

Country Link
US (1) US4798315A (ja)
EP (1) EP0244354B1 (ja)
JP (1) JPH07221B2 (ja)
AT (1) ATE51172T1 (ja)
CA (1) CA1286084C (ja)
DE (1) DE3761951D1 (ja)
ES (1) ES2014035B3 (ja)
GR (1) GR3000543T3 (ja)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5616167A (en) * 1993-07-13 1997-04-01 Eckert; C. Edward Method for fluxing molten metal
US5474282A (en) * 1993-07-13 1995-12-12 Eckert; C. Edward Titanium composite for molten metal
US5772725A (en) * 1993-07-13 1998-06-30 Eckert; C. Edward Method for fluxing molten metal
US5718742A (en) * 1993-07-13 1998-02-17 Eckert; C. Edward Ladle and impeller rotation for fluxing molten metal
US5435375A (en) * 1993-07-13 1995-07-25 Eckert; C. Edward Titanium composite casting nozzle
US5452827A (en) * 1993-07-13 1995-09-26 Eckert; C. Edward Nozzle for continuous caster
US5630863A (en) * 1993-07-13 1997-05-20 Eckert; C. Edward Method for fluxing molten-metal
US5439047A (en) * 1994-02-07 1995-08-08 Eckert; C. Edward Heated nozzle for continuous caster
US5687789A (en) * 1995-12-28 1997-11-18 Larex A.G. Caster with improved coil changing system
US5787968A (en) * 1995-12-28 1998-08-04 Larex A.G. Movably mounted side dam and an associated method of sealing the side dam against the nozzle of a belt caster
US5640868A (en) * 1995-12-28 1997-06-24 Larex A.G. Apparatus and method for work hardening an endless belt for use in a belt caster
US5778967A (en) * 1996-01-11 1998-07-14 Larex A.G. Side dam for a caster having improved contact with solidifying metal
US5613547A (en) * 1996-01-11 1997-03-25 Larex A.G. Nozzle with a baffle for a caster and an associated method of casting molten metal
US5671801A (en) * 1996-01-11 1997-09-30 Larex A.G. Cooling system for a belt caster and associated methods
US5711367A (en) * 1996-01-11 1998-01-27 Larex A.G. Apparatus for delivering molten metal to a caster including wear strips
US6173755B1 (en) 1996-05-23 2001-01-16 Aluminum Company Of America Nozzle for continuous slab casting
BR9709772A (pt) * 1996-06-07 2000-01-25 Mannesmann Ag Bocal de fundi o para instala o de moldagem de tiras finas.
US5799720A (en) * 1996-08-27 1998-09-01 Ajax Magnethermic Corp. Nozzle assembly for continuous caster
US6049067A (en) * 1997-02-18 2000-04-11 Eckert; C. Edward Heated crucible for molten aluminum
US5850072A (en) * 1997-02-18 1998-12-15 Eckert; C. Edward Electric heater assembly
US5823246A (en) * 1997-03-03 1998-10-20 Larex A.G. Tundish including a baffle for directing molten metal therethrough and an associated caster and method of casting molten metal
US5967220A (en) * 1997-03-25 1999-10-19 Larex, A.G. Caster including a gas delivery means to resist backflowing and freezing of molten metal to the tip of a nozzle

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805877A (en) * 1972-09-15 1974-04-23 Southwire Co Continuous casting apparatus employing an oval-ended pouring spout
CH633205A5 (de) * 1978-01-30 1982-11-30 Alusuisse Vorrichtung zum zufuehren einer metallschmelze beim bandgiessen.
JPS6054818B2 (ja) * 1979-07-10 1985-12-02 日本鋼管株式会社 水平連続鋳造用タンデイツシユとモ−ルドとの結合方法および装置
JPS59110151U (ja) * 1983-01-18 1984-07-25 株式会社神戸製鋼所 水平連続鋳造用フイ−ドノズル部構造
CH661882A5 (de) * 1983-06-01 1987-08-31 Lauener W F Ag Verfahren zum zufuehren einer metallschmelze in den giessspalt einer giessmaschine und giessmaschine zur durchfuehrung des verfahrens.
DE3328585C1 (de) * 1983-08-08 1984-07-26 Fried. Krupp Gmbh, 4300 Essen Giessduese zum Zufuehren von Stahlschmelze in eine Stranggiesskokille
DE3337583C1 (de) * 1983-10-15 1984-12-06 Fried. Krupp Gmbh, 4300 Essen Vorrichtung zum Bandgiessen von Stahl in einer Stranggiesskokille mit mitlaufenden Kokillenwaenden

Also Published As

Publication number Publication date
US4798315A (en) 1989-01-17
ES2014035B3 (es) 1990-06-16
EP0244354A2 (de) 1987-11-04
ATE51172T1 (de) 1990-04-15
GR3000543T3 (en) 1991-07-31
JPS62263852A (ja) 1987-11-16
EP0244354A3 (en) 1988-03-23
JPH07221B2 (ja) 1995-01-11
CA1286084C (en) 1991-07-16
DE3761951D1 (de) 1990-04-26

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