EP3375544A1 - Horizontal strip casting installation with optimised casting belt - Google Patents
Horizontal strip casting installation with optimised casting belt Download PDFInfo
- Publication number
- EP3375544A1 EP3375544A1 EP18161095.7A EP18161095A EP3375544A1 EP 3375544 A1 EP3375544 A1 EP 3375544A1 EP 18161095 A EP18161095 A EP 18161095A EP 3375544 A1 EP3375544 A1 EP 3375544A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- casting
- strip
- region
- casting belt
- belt
- 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
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- 238000005266 casting Methods 0.000 title claims abstract description 127
- 238000009434 installation Methods 0.000 title claims 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 29
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 238000007373 indentation Methods 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 5
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 5
- 229910002555 FeNi Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 238000004049 embossing Methods 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 239000011324 bead Substances 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 2
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 2
- 229910003460 diamond Inorganic materials 0.000 claims description 2
- 239000010432 diamond Substances 0.000 claims description 2
- 230000017525 heat dissipation Effects 0.000 description 12
- 238000001816 cooling Methods 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 239000000155 melt Substances 0.000 description 7
- 238000007711 solidification Methods 0.000 description 6
- 230000008023 solidification Effects 0.000 description 6
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 229910000851 Alloy steel Inorganic materials 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 239000002243 precursor Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000000265 homogenisation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000008199 coating composition Substances 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 229910017083 AlN Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- VNTLIPZTSJSULJ-UHFFFAOYSA-N chromium molybdenum Chemical compound [Cr].[Mo] VNTLIPZTSJSULJ-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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- 239000000203 mixture Substances 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- B22D11/0631—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a travelling straight surface, e.g. through-like moulds, a belt
-
- 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
- B22D11/0648—Casting surfaces
- B22D11/0654—Casting belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
- B22D11/0668—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating for dressing, coating or lubricating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/0665—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating
- B22D11/0674—Accessories therefor for treating the casting surfaces, e.g. calibrating, cleaning, dressing, preheating for machining
Definitions
- the invention relates to a system for horizontal strip casting of a pre-strip of metal.
- the strip casting plant has a melting vessel from which melt is fed via a pouring nozzle onto a horizontally encircling casting belt.
- a cooling device is arranged under an upper run of the casting belt.
- the abandoned melt solidifies to a preliminary band.
- the strip casting plant has an enclosure into which a gas stream is introduced in order to form a reducing or oxidizing atmosphere or an inert gas atmosphere for the discontinued melt and the solidifying pre-strip.
- the gas stream is introduced via nozzles which are arranged in a ceiling element of the housing.
- the gas flow is varied with regard to its temperature and its speed and pressure profile.
- a horizontal strip caster for producing a pre-strip of steel is known.
- a circulating casting belt of the strip casting plant is coated with a coating composition consisting of a carrier liquid and additives prior to the application of a melt in the region of an upper side facing the pre-strip.
- additives are a wide variety of metals or metallic oxides / nitrides / borides, with which the material properties of the pre-band can be specifically influenced.
- the carrier liquid is removed in a drying unit.
- a firmly adhering coating of the steel strip may alternatively be formed, via the thickness of which the heat transfer between the casting strip and the pre-strip and thus the cooling rate of the melt or pre-strip can be controlled.
- German publication DE 10 2012 001 469 A1 relates to a horizontal strip caster for producing a pre-strip.
- a discontinuous melt solidifies on a casting belt which, after complete through-stiffening of the pre-strip, is subjected to conditioning in an in-line process.
- This conditioning includes at least one of annealing, drying, straightening, brushing, cleaning, descaling, stretching, smoothing or coating.
- Possible permanent coatings are ceramics or metal / ceramic compounds.
- renewable coatings are dispersing layers of BN, nitrides, oxides or carbides in question. On the basis of the coating, the heat transfer between the casting belt and the pre-strip can be controlled.
- the publication WO 2007/071225 A1 relates to a horizontal strip casting plant for producing a pre-strip of light-weight steel, in particular. It is proposed a casting belt, which is provided to reduce the heat transfer and the contact between itself and the solidifying to a Vorband strand with a structure. This structure has longitudinally extending beads or nubs distributed over the surface, which are impressed into the casting tape from above.
- the German patent application DE 28 56 472 concerns, among other things, a continuous casting mold belt casting for casting aluminum and aluminum alloys.
- the mold has a roughened surface to control the heat transfer on first contact with the molten metal.
- the mold surface has a roughness pattern consisting of a regular array of pyramid or frusto-conical elevations, so that the melt only the tips of these elevations of the mold surface touched.
- the bulging then causes the melt to shift in the direction of the center of the strip, thereby causing already solidified dendrites to come to the surface of the strip, at which point no lid formation has yet taken place.
- the formation of a dense, non-porous surface can be hampered by the low heat removal at the top of the belt and a correspondingly lower solidification rate and unfavorable flow boundary layers by the flow of the atmosphere.
- the present invention is based on the object to provide a system for horizontal strip casting of a pre-strip of metal, with an improved geometry and surface of the pre-strip, increased output and thus a significant improvement in efficiency is achieved.
- the casting tape is provided in the region of a solidifying upper surface facing the upper surface with a surface structure, an improved geometry and surface of the pre-strip, an increased yielding and thus a significant improvement in efficiency achieved that the surface structure is created by a shaping shaping of the casting belt.
- an embossing reshaping is understood to mean a production method in which indentations or elevations on the upper side of the casting strip are formed together with oppositely arranged elevations or indentations on the underside of the casting strip. Elevations on the top of the casting belt thus correspond at the same place with indentations on the underside of the casting belt or vice versa. In this manufacturing method, there may be deviations between the shape of the indentations or elevations on the top and bottom, in order to obtain or optimize the desired shape on the top.
- this stamping process for the production of casting tapes is particularly well that it is simple and inexpensive and is shifted by the stamping only material in the thickness direction of the casting belt and thus preserving the original dimensions of the casting belt. There are no or hardly any changes in the length and width of the casting belt, which would have resulted in corresponding rework.
- the surface structure is formed regularly.
- the surface structure has a first pattern in the middle region and, optionally, a pattern different from the first pattern in the edge regions.
- the uniform heat dissipation is effected in an advantageous manner by preventing the lifting of the cast pre-strip.
- the homogenization of the cooling conditions over the bandwidth affects a deformation of the cast Vorbandes (U-shape) contrary.
- different solidification of the pre-strip is counteracted and thus local porosities and voids, which often occur linearly in the casting, avoided.
- an improvement in the quality, the surface and the geometry of a produced Vorbandes especially for alloys with low Al contents - preferably Al ⁇ 0.8 wt .-% - achieved by the homogenization of the cooling conditions.
- the application is increased and associated with the economy.
- the casting tape at least in the region of an upper side facing the solidifying precursor, is made of a material having a thermal conductivity of greater than 90 W / mK (at 40 ° C.), in particular greater than 100 W / mK (at 40 ° C.) is and has a casting tape thickness of 0.5 to 3 mm, in particular from 1 to 3 mm.
- materials are particularly suitable aluminum, an aluminum alloy, copper or a copper alloy.
- the use of aluminum, aluminum alloy, copper or copper alloy as cast strip material further allows an increase in the casting strip thickness with the same or improved heat dissipation, whereby a buckling of the casting belt is counteracted and in particular a homogenization of the heat dissipation over the surface.
- the casting tape is provided with a surface structure at least in the region of the solidifying pre-band facing surface and the surface structure preferably a tear, pyramid, diamond, bead or dot pattern with a depth of 0.075 to 0.8 mm in the sense of indentations or elevations.
- a stiffening of the structure is achieved and increases the heat dissipation down and homogenized and improves the heat conduction also within the casting belt. It follows that the production by imprinting reshaping the casting belt on a bottom of the casting belt elevations or indentations are arranged opposite to the indentations or elevations on the top of the casting belt.
- a further alternative or additional embodiment provides that the casting tape in the region of an upper side facing the solidifying pre-band can have a different pattern and a 20 to 75% higher embossing depth of the structure in edge regions in each case up to a maximum of 25 cm from the edge in the direction of the tape center.
- a cast strip with reduced thermal conductivity is used. Due to the reduced thermal conductivity of the casting belt, the heat dissipation is delayed down and thus increases the proportion of solidification of the Vorbandoberseite and promoted the formation of a lid on the Vorbandoberseite during casting. This is particularly advantageous for steels with an increased tendency to surface defects and open porosity, where a casting belt of an alloy with higher thermal conductivity would otherwise cause the metallurgical center (area of residual solidification) to move in the cast pre-strip toward the strip surface. Alloys with an Al content of less than 0.8% by weight and a solidification interval greater than 30 ° C. are counted among the surface-sensitive grades, as well as steels containing high C and high Si.
- the casting tape for reducing and delaying the heat dissipation down at least in the region of a solidifying upper band facing top made of a material having a thermal conductivity of less than 35 W / mK (at 40 ° C) and a casting strip thickness of 0, 5 to 3 mm.
- a material having a thermal conductivity of less than 35 W / mK (at 40 ° C) and a casting strip thickness of 0, 5 to 3 mm are stainless steels, high Cr steels and FeNi alloys.
- Particularly advantageous are the low expansion coefficients of, for example FeNi alloys, which additionally counteract a bulging of the pre-strip.
- the dense oxide layer improves the separation behavior between the casting strip and the cast pre-strip.
- the casting belt is formed of a plurality of materials, wherein the casting belt, in particular in the edge regions in each case up to a maximum of 25 cm from the edges seen from another Material consists of the middle part of the casting belt.
- the casting belt can be constructed in such a way that materials with different thermal conductivities are used selectively in order to influence the local cooling conditions. The difference in thermal conductivity should be at least 20%.
- materials in the middle of the band are particularly suitable aluminum, aluminum alloys, copper and copper alloys with a thickness of 0.5 to 3 mm.
- materials preferably made of micro-alloyed structural steel or stainless steel with a thickness of 0.5 to 3 mm are advantageous.
- the casting tape over the bandwidth has a varying thickness.
- the edge regions have a thickness which is at least 10% different from the center, and the transition between the regions of different thickness can take place both stepwise and preferably continuously. As a result, an optimization of the heat dissipation is achieved.
- a casting belt having different material thicknesses between the center region and the edge region is used in conjunction with stainless steels or FeNi alloys having a thickness of 0.5 to 3 mm.
- the material is at least 10% thicker in the edge areas than in the center areas. This causes a reduction in heat dissipation.
- a further alternative or additional embodiment provides that the casting tape in the middle region consists of a micro-alloyed structural steel and in the edge region of a high-Cr steel or stainless steel.
- the reduced thermal conductivity of the edge region of the casting belt advantageously reduces heat dissipation, thereby avoiding undesirably rapid cooling of the edge regions.
- the casting tape is completely or partially provided with a coating which preferably contains BN, ZrO 2 , TiO 2 , Al 2 O 3 or AlN.
- the layer thickness is chosen so that a heat transfer is reduced by at least 5%. As a result, a heat transfer from the cast pre-strip is reduced to the casting belt.
- the reduced heat dissipation leads to a reduction of band distortions (for example, the known U-shape) of the produced Vorbandes.
- band distortions for example, the known U-shape
- these belt distortions are caused by excessive local heat dissipation in the area of the strip edges.
- FIG. 1 The schematic side view of a horizontal strip casting plant 1 essentially consists of a melting vessel 2, a pouring nozzle 3, a casting belt 4 and an enclosure 5.
- liquid melt S in particular molten metal
- the endless casting belt 4 runs in a casting direction G about a front deflection roller 4a and a rear deflection roller 4b spaced therefrom in the casting direction G and thus conveys the solidifying precursor V in the casting direction G.
- the casting belt 4 can be moved into an upper strand 4c, on which the Vorband V solidifies, and a lower strand 4d between the front and rear pulleys 4a, 4b split.
- a strand 4c, 4d is understood to mean that part of the casting strip 4 which extends between the deflection rollers 4a, 4b.
- the casting belt 4 runs substantially horizontally in the region of the upper strand 4c and is cooled in the region of the upper strand 4c by means of a cooling device 7 from below, almost all of the upper strand 4c, with the exception of short regions at the transition to the deflection rollers 4a, 4b with coolant, preferably water, applied.
- the housing 5 of the horizontal strip caster 1 surrounds the solidifying precursor V in a region between the pouring nozzle 3 and an outlet 5b for the solidified supernatant V from the housing 5.
- the housing 5 is provided in a conventional manner to the melt S in a reducing atmosphere , an oxidizing atmosphere, an inert gas atmosphere or a casting atmosphere, which is adapted to the chemical composition of the melt to shed and solidify to the Vorband V.
- a gas supply line 5c and a gas discharge line 5d are connected to the housing 5 in the region of an upper and substantially horizontally extending ceiling element 5a of the housing 5.
- the gas supply line 5c is located in the region of the outlet 5b and the gas discharge line 5d in the region of the pouring nozzle, so that the gas flows counter to the pouring direction G in countercurrent to the solidifying precursor V or vice versa.
- Such horizontal strip casters 1 are particularly suitable for the production of close to near-demarcated Vorband with strip thicknesses in the range of 6 to 25 mm (measured in the band center) from high manganese or high aluminum or high silicon lightweight steels, electrical steel or other high or low alloy steel.
- FIG. 2a shows a structured surface of a top 4e of the casting belt 4 of the strip casting 1 in a first embodiment.
- This surface is provided with teardrop-shaped patterns 7, 8 with a depth or height of 0.075 to 0.8 mm in the sense of indentations or elevations.
- a stiffening of the structure of the casting belt 4 is achieved and increases the heat dissipation down and homogenized and improves the heat conduction also within the casting belt.
- a first pattern 7 in a center region M on the surface of the casting belt 4 is different from a second pattern 8 of the surface of the casting belt 4 in the edge regions R which are laterally adjacent to the center region M.
- the edge regions R point in the casting direction G, respectively a width of up to a maximum of 25 cm - measured from the edge of the casting belt 4 - on.
- the second pattern 8 leads to a changed heat transfer, in particular a reduced heat transfer in the edge regions R, compared with the center region M.
- the indentations or surveys opposite found in the reverse direction surveys or impressions with substantially the same shape. In this manufacturing method, there may be deviations between the shape of the indentations on the top and bottom to obtain the desired shape on the top.
- FIG. 2b Another embodiment of the structured surface of the upper side 4e of the casting belt 4 shows the FIG. 2b , in which a doubly arranged teardrop-shaped pattern 7, 8 - a so-called duet pattern - having a depth or height of 0.075 to 0.8 mm in the sense of indentations or elevations.
- the further embodiment is comparable to the previous one FIG. 2a described.
- the Figure 2c shows yet another embodiment of a structured surface of the upper side 4e of the casting belt 4, which is provided with a pattern 7, 8 of each side adjacent pyramids with square base with a depth or height of 0.075 to 0.8 mm in the sense of imprints or elevations is.
- the further embodiment is comparable to the previous one FIG. 2a described.
- teardrop-shaped and pyramidal patterns surface structures with different tear and pyramidal patterns and / or with rhombus, honeycomb, bead, knob or dot patterns are also conceivable.
- trigonal-pyramidal to hexagonal-pyramidal patterns and / or truncated pyramidal pattern can be selected.
- the patterns are based on DIN 59220.
- Cross corrugations and elliptical nubs have a ratio of major to minor axis of 1.8 to 4.8 and are arranged at an angle of 30 to 90 ° to the casting direction G or perpendicular to each other or alternately.
- both an ordered and a purely random statistical arrangement of the patterns is possible.
- the casting belt 4 in addition to the structuring of the surface of the upper side 4e the casting belt 4 with another pattern 8 in edge regions R of the casting belt 4 also a 20 to 75% higher embossing depth of the pattern 7 of the structured surface of the casting belt 4 in edge regions R possible, whereby lifting the solidifying Vorbandes V in the edge region R during the casting process takes place and thereby the heat transfer in the edge region R is reduced.
Abstract
Die Erfindung betrifft eine Anlage zum horizontalen Bandgießen eines Vorbandes (V) aus Metall, mit einem Gießband (4) mit einem Mittenbereich (M) und seitlich daran anschließenden Randbereichen (R), wobei das Gießband (4) im Bereich einer dem erstarrenden Vorband (V) zugewandten Oberseite (4e) mit einer Oberflächenstruktur ausgestattet ist. Um eine Anlage zum horizontalen Bandgießen eines Vorbandes (V) aus Metall zu schaffen, mit der eine verbesserte Geometrie und Oberfläche des Vorbandes (V), ein erhöhtes Ausbringen und damit eine wesentliche Verbesserung der Wirtschaftlichkeit erreicht wird, wird vorgeschlagen, dass die Oberflächenstruktur durch ein durchprägendes Umformen des Gießbandes (4) entstanden ist. The invention relates to a system for the horizontal strip casting of a sliver (V) made of metal, with a casting belt (4) with a central region (M) and laterally adjoining edge regions (R), wherein the casting belt (4) in the region of a solidifying pre-strip ( V) facing top (4e) is equipped with a surface structure. In order to provide a system for horizontal strip casting of a pre-strip (V) made of metal, with an improved geometry and surface of the pre-strip (V), increased output and thus a significant improvement in the economy is achieved, it is proposed that the surface structure by a formed by forming the casting strip (4).
Description
Die Erfindung betrifft eine Anlage zum horizontalen Bandgießen eines Vorbandes aus Metall.The invention relates to a system for horizontal strip casting of a pre-strip of metal.
Aus der deutschen Patentschrift
Aus der deutschen Patentschrift
Auch die deutsche Offenlegungsschrift
Die Offenlegungsschrift
Aus der europäischen Patentschrift
Die deutsche Offenlegungsschrift
Es ist allgemein bekannt, dass bei der Herstellung von Vorband in einer Banddicke von 6 bis 25 mm häufig Kantenfehler auftreten, die sich in einer zum Rand hin abgeflachten Kante des Vorbandes und in Rissen in den Randbereichen zeigen. Das Auftreten abgeflachter Kanten führt zu Walzfehlern und kann dadurch Kantenrisse verursachen. Die Risse treten in den Randbereichen des gegossenen Vorbandes auf und sind in etwa 30 mm bis 100 mm von dem Rand entfernt. Auch kommt es zeitweise durch eine abkühlbedingte Verformung der Schmelze zu mechanischen Spannungen im Gefüge des Gießbandes, welche ein Abheben des Vorbandes vom Gießband auch nur lokal bewirken und welche des Weiteren zu Rissen im Vorband führen, da das Material bei hohen Temperaturen nahe unterhalb des Erstarrungspunktes nur eine geringe Heißduktilität aufweist. Das Aufwölben führt dann dazu, dass die Schmelze sich in Richtung Bandmitte verlagert und dadurch bereits erstarrte Dendriten an die Bandoberfläche treten, an der bis zu diesem Zeitpunkt noch keine Deckelbildung stattgefunden hat. Dies führt zu einer offenen Porosität bevorzugt in den randnahen Bereichen, welche bei der Verarbeitung des Bandes zu Oberflächen- und Gefügefehlern führt. Diese Risse mit Oberflächenkontakt führen ebenso zu Materialfehlern während der Weiterverarbeitung, weshalb das Material besäumt werden muss und die Wirtschaftlichkeit sinkt. Die Ausbildung einer dichten, nicht offenporigen Oberfläche kann durch die geringe Wärmeabfuhr an der Bandoberseite und eine dementsprechend geringere Erstarrungsgeschwindigkeit und ungünstige Strömungsgrenzschichten durch die Strömung der Atmosphäre behindert werden.It is generally known that in the production of pre-strip in a strip thickness of 6 to 25 mm often edge defects occur, which show in a flattened edge to the edge of the pre-strip and in cracks in the edge regions. The occurrence of flattened edges leads to rolling defects and can thereby cause edge cracks. The cracks occur in the peripheral areas of the cast pre-strip and are about 30 mm to 100 mm from the edge. It also comes at times by a cooling-induced deformation of the melt to mechanical stresses in the structure of the casting belt, which cause a lifting of the pre-strip of the casting belt only locally and which further lead to cracks in the opening band, since the material at high temperatures close below the solidification point only has a low hot ductility. The bulging then causes the melt to shift in the direction of the center of the strip, thereby causing already solidified dendrites to come to the surface of the strip, at which point no lid formation has yet taken place. This leads to an open porosity preferably in the near-edge areas, which leads to surface and structural defects in the processing of the tape. These cracks with surface contact also lead to material defects during further processing, which is why the material has to be trimmed and the economy is reduced. The formation of a dense, non-porous surface can be hampered by the low heat removal at the top of the belt and a correspondingly lower solidification rate and unfavorable flow boundary layers by the flow of the atmosphere.
Der vorliegenden Erfindung liegt die Aufgabe zu Grunde, eine Anlage zum horizontalen Bandgießen eines Vorbandes aus Metall zu schaffen, mit der eine verbesserte Geometrie und Oberfläche des Vorbandes, ein erhöhtes Ausbringen und damit eine wesentliche Verbesserung der Wirtschaftlichkeit erreicht wird.The present invention is based on the object to provide a system for horizontal strip casting of a pre-strip of metal, with an improved geometry and surface of the pre-strip, increased output and thus a significant improvement in efficiency is achieved.
Diese Aufgabe wird durch eine Anlage zum horizontalen Bandgießen eines Vorbandes aus Metall mit den Merkmalen des Anspruches 1 gelöst. Vorteilhafte Ausgestaltungen sind in den Ansprüchen 2 bis 14 angegebenThis object is achieved by a system for horizontal strip casting of a pre-strip of metal with the features of
Erfindungsgemäß wird bei einer Anlage zum horizontalen Bandgießen eines Vorbandes aus Metall mit einem Gießband mit einem Mittenbereich und seitlich daran anschließenden Randbereichen, wobei das Gießband im Bereich einer dem erstarrenden Vorband zugewandten Oberseite mit einer Oberflächenstruktur ausgestattet ist, eine verbesserte Geometrie und Oberfläche des Vorbandes, ein erhöhtes Ausbringen und damit eine wesentliche Verbesserung der Wirtschaftlichkeit dadurch erreicht, dass die Oberflächenstruktur durch ein durchprägendes Umformen des Gießbandes entstanden ist.According to the invention, in a system for horizontal strip casting of a pre-strip made of metal with a casting belt with a central region and laterally adjoining edge regions, wherein the casting tape is provided in the region of a solidifying upper surface facing the upper surface with a surface structure, an improved geometry and surface of the pre-strip, an increased yielding and thus a significant improvement in efficiency achieved that the surface structure is created by a shaping shaping of the casting belt.
In Zusammenhang mit der vorliegenden Erfindung wird unter einem durchprägenden Umformen ein Herstellungsverfahren verstanden, bei dem Einprägungen beziehungsweise Erhebungen an der Oberseite des Gießbandes zusammen mit gegenüberliegend angeordneten Erhebungen beziehungsweise Einprägungen an der Unterseite des Gießbandes entstehen. Erhebungen an der Oberseite des Gießbandes korrespondieren somit an der gleichen Stelle mit Einprägungen an der Unterseite des Gießbandes oder umgekehrt. Bei diesem Herstellungsverfahren kann es Abweichungen zwischen der Form der Einprägungen beziehungsweise Erhebungen auf der Ober- und Unterseite geben, um die gewünschte Form auf der Oberseite zu erhalten beziehungsweise zu optimieren. Insgesamt eignet sich dieses Durchprägeverfahren für die Herstellung von Gießbändern besonders gut, dass es einfach und kostengünstig ist und durch das Durchprägen nur Material in Dickenrichtung des Gießbandes verlagert wird und somit die ursprünglichen Abmessungen des Gießbandes erhalten bleiben. Es treten keine beziehungsweise kaum Änderungen der Länge und Breite des Gießbandes auf, was entsprechende Nacharbeit zur Folge hätte.In connection with the present invention, an embossing reshaping is understood to mean a production method in which indentations or elevations on the upper side of the casting strip are formed together with oppositely arranged elevations or indentations on the underside of the casting strip. Elevations on the top of the casting belt thus correspond at the same place with indentations on the underside of the casting belt or vice versa. In this manufacturing method, there may be deviations between the shape of the indentations or elevations on the top and bottom, in order to obtain or optimize the desired shape on the top. Overall, this stamping process for the production of casting tapes is particularly well that it is simple and inexpensive and is shifted by the stamping only material in the thickness direction of the casting belt and thus preserving the original dimensions of the casting belt. There are no or hardly any changes in the length and width of the casting belt, which would have resulted in corresponding rework.
Bevorzugt ist vorgesehen, dass die Oberflächenstruktur regelmäßig ausgebildet ist.It is preferably provided that the surface structure is formed regularly.
In einer weiteren vorteilhaften Ausgestaltung ist vorgesehen, dass die Oberflächenstruktur in dem Mittebereich ein erstes Muster und optional in den Randbereichen ein von dem ersten Muster verschiedenes Muster aufweist.In a further advantageous embodiment, it is provided that the surface structure has a first pattern in the middle region and, optionally, a pattern different from the first pattern in the edge regions.
Durch eine Veränderung des Gießbandwerkstoffes und/oder der Gießbandgeometrie und -struktur wird in vorteilhafter Weise die gleichmäßige Wärmeabfuhr durch Verhinderung des Abhebens des gegossenen Vorbandes bewirkt. Die Homogenisierung der Abkühlbedingungen über die Bandbreite wirkt einer Verformung des gegossenen Vorbandes (U-Form) entgegen. Insbesondere einer durch ungleichmäßigen Wärmeübergang hervorgerufenen, unterschiedlichen Erstarrung des Vorbandes wird entgegengewirkt und somit lokale Porositäten und Lunker, welche oftmals linienförmig in Gießrichtung auftreten, vermieden. Insgesamt wird eine Verbesserung der Qualität, der Oberfläche und der Geometrie eines erzeugten Vorbandes insbesondere bei Legierungen mit niedrigen Al-Gehalten - bevorzugt Al < 0.8 Gew.-% - durch die Homogenisierung der Abkühlbedingungen erreicht. Auch wird das Ausbringen erhöht und damit verbunden die Wirtschaftlichkeit.By changing the casting belt material and / or the casting belt geometry and structure, the uniform heat dissipation is effected in an advantageous manner by preventing the lifting of the cast pre-strip. The homogenization of the cooling conditions over the bandwidth affects a deformation of the cast Vorbandes (U-shape) contrary. In particular, caused by uneven heat transfer, different solidification of the pre-strip is counteracted and thus local porosities and voids, which often occur linearly in the casting, avoided. Overall, an improvement in the quality, the surface and the geometry of a produced Vorbandes especially for alloys with low Al contents - preferably Al <0.8 wt .-% - achieved by the homogenization of the cooling conditions. Also, the application is increased and associated with the economy.
Vorzugsweise ist vorgesehen, dass das Gießband zumindest im Bereich einer dem erstarrenden Vorband zugewandten Oberseite aus einem Werkstoff mit einer Wärmeleitfähigkeit von größer 90 W/mK (bei 40 °C), insbesondere von größer 100 W/mK (bei 40 °C), hergestellt ist und eine Gießbanddicke von 0,5 bis 3 mm, insbesondere von 1 bis 3 mm aufweist. Als Werkstoffe eignen sich besonders Aluminium, eine Aluminiumlegierung, Kupfer oder eine Kupferlegierung.It is preferably provided that the casting tape, at least in the region of an upper side facing the solidifying precursor, is made of a material having a thermal conductivity of greater than 90 W / mK (at 40 ° C.), in particular greater than 100 W / mK (at 40 ° C.) is and has a casting tape thickness of 0.5 to 3 mm, in particular from 1 to 3 mm. As materials are particularly suitable aluminum, an aluminum alloy, copper or a copper alloy.
Die Verwendung von Aluminium, Aluminiumlegierung, Kupfer oder Kupferlegierung als Gießbandwerkstoff ermöglicht des Weiteren eine Erhöhung der Gießbanddicke bei gleicher oder verbesserter Wärmeabfuhr, wodurch einer Beulung des Gießbandes entgegengewirkt wird und insbesondere eine Homogenisierung der Wärmeabfuhr über die Fläche erfolgt.The use of aluminum, aluminum alloy, copper or copper alloy as cast strip material further allows an increase in the casting strip thickness with the same or improved heat dissipation, whereby a buckling of the casting belt is counteracted and in particular a homogenization of the heat dissipation over the surface.
In einer alternativen oder zusätzlichen Ausführung ist vorgesehen, dass das Gießband zumindest im Bereich einer dem erstarrenden Vorband zugewandten Oberseite mit einer Oberflächenstruktur versehen ist und die Oberflächenstruktur vorzugsweise ein Tränen-, Pyramiden-, Rauten-, Sicken- oder Punktmuster mit einer Tiefe von 0,075 bis 0,8 mm im Sinne von Einprägungen oder Erhebungen aufweist. Hierdurch wird eine Versteifung der Struktur erzielt sowie die Wärmeabfuhr nach unten erhöht und homogenisiert und die Wärmeleitung auch innerhalb des Gießbandes verbessert. Hierbei ergibt sich, dass der Herstellung durch durchprägendes Umformen folgend das Gießband auf einer Unterseite des Gießbandes Erhebungen oder Einprägungen angeordnet sind, die den Einprägungen oder Erhebungen auf der Oberseite des Gießbandes gegenüberliegen.In an alternative or additional embodiment, it is provided that the casting tape is provided with a surface structure at least in the region of the solidifying pre-band facing surface and the surface structure preferably a tear, pyramid, diamond, bead or dot pattern with a depth of 0.075 to 0.8 mm in the sense of indentations or elevations. As a result, a stiffening of the structure is achieved and increases the heat dissipation down and homogenized and improves the heat conduction also within the casting belt. It follows that the production by imprinting reshaping the casting belt on a bottom of the casting belt elevations or indentations are arranged opposite to the indentations or elevations on the top of the casting belt.
Alternativ oder zusätzlich ist auch eine Kombination von Al- oder Cu-haltigem Gießbandwerkstoff und einer Oberflächenstrukturierung möglich.Alternatively or additionally, a combination of Al- or Cu-containing Casting strip material and a surface structuring possible.
Eine weitere alternative oder zusätzliche Ausführung sieht vor, dass das Gießband im Bereich einer dem erstarrenden Vorband zugewandten Oberseite in Randbereichen jeweils bis maximal 25 cm vom Rand in Richtung Bandmitte gesehen ein anderes Muster und eine um 20 bis 75 % höhere Prägetiefe der Struktur aufweisen kann.A further alternative or additional embodiment provides that the casting tape in the region of an upper side facing the solidifying pre-band can have a different pattern and a 20 to 75% higher embossing depth of the structure in edge regions in each case up to a maximum of 25 cm from the edge in the direction of the tape center.
Noch eine weitere alternative oder zusätzliche Ausführung sieht vor, dass ein Gießband mit verminderter Wärmeleitfähigkeit verwendet wird. Durch die verringerte Wärmeleitfähigkeit des Gießbandes wird die Wärmeabfuhr nach unten verzögert und damit der Anteil der Erstarrung von der Vorbandoberseite erhöht sowie die Ausbildung eines Deckels auf der Vorbandoberseite während des Gusses befördert. Dies ist insbesondere bei Stählen mit erhöhter Neigung zu Oberflächenfehlern und offener Porosität vorteilhaft, bei denen ein Gießband aus einer Legierung mit höherer Wärmeleitfähigkeit ansonsten ein Verschieben der metallurgischen Mitte (Bereich der Resterstarrung) im gegossenen Vorband hin zur Bandoberfläche bewirken würde. Zu den oberflächenempfindlichen Güten werden insbesondere Legierungen mit einem Al-Gehalt kleiner 0,8 Gew.-% und einem Erstarrungsintervall größer 30°C gezählt, sowie hoch C-haltige und hoch Si-haltige Stähle.Yet another alternative or additional embodiment provides that a cast strip with reduced thermal conductivity is used. Due to the reduced thermal conductivity of the casting belt, the heat dissipation is delayed down and thus increases the proportion of solidification of the Vorbandoberseite and promoted the formation of a lid on the Vorbandoberseite during casting. This is particularly advantageous for steels with an increased tendency to surface defects and open porosity, where a casting belt of an alloy with higher thermal conductivity would otherwise cause the metallurgical center (area of residual solidification) to move in the cast pre-strip toward the strip surface. Alloys with an Al content of less than 0.8% by weight and a solidification interval greater than 30 ° C. are counted among the surface-sensitive grades, as well as steels containing high C and high Si.
Vorzugsweise ist vorgesehen, dass das Gießband zur Verringerung und Verzögerung der Wärmeabfuhr nach unten zumindest im Bereich einer dem erstarrenden Vorband zugewandten Oberseite aus einem Werkstoff mit einer Wärmeleitfähigkeit von kleiner 35 W/mK (bei 40 °C) hergestellt ist und eine Gießbanddicke von 0,5 bis 3 mm aufweist. Als Werkstoffe eignen sich besonders rostfreie Stähle, hoch Cr-haltige Stähle und FeNi-Legierungen. Insbesondere vorteilhaft sind die geringen Ausdehnungskoeffizienten von zum Beispiel FeNi-Legierungen, die einem Beulen des Vorbandes zusätzlich entgegenwirken. Weiterhin vorteilhaft bei rostfreiem oder hoch Cr-haltigem Stahl bewirkt die dichte Oxidschicht (vor allem Cr2O3) eine Verbesserung des Trennverhaltens zwischen Gießband und gegossenem Vorband.Preferably, it is provided that the casting tape for reducing and delaying the heat dissipation down at least in the region of a solidifying upper band facing top made of a material having a thermal conductivity of less than 35 W / mK (at 40 ° C) and a casting strip thickness of 0, 5 to 3 mm. Particularly suitable materials are stainless steels, high Cr steels and FeNi alloys. Particularly advantageous are the low expansion coefficients of, for example FeNi alloys, which additionally counteract a bulging of the pre-strip. Furthermore, in the case of stainless or high Cr steel, the dense oxide layer (above all Cr 2 O 3 ) improves the separation behavior between the casting strip and the cast pre-strip.
In einer alternativen oder zusätzlichen Ausführung ist vorgesehen, dass das Gießband aus mehreren Werkstoffen ausgebildet ist, wobei das Gießband insbesondere in den Randbereichen jeweils bis maximal 25 cm von den Rändern gesehen aus einem anderen Werkstoff besteht als der Mittelteil des Gießbandes. Dabei kann je nach gewünschter Verlagerung der metallurgischen Mitte das Gießband derart konstruiert sein, dass Werkstoffe mit unterschiedlichen Wärmeleitfähigkeiten gezielt eingesetzt werden, um die lokalen Abkühlbedingungen zu beeinflussen. Der Unterschied der Wärmeleitfähigkeit sollte mindestens 20 % betragen. Als Werkstoffe in der Bandmitte eignen sich besonders Aluminium, Aluminiumlegierungen, Kupfer und Kupferlegierungen mit einer Dicke von 0,5 bis 3 mm. Für die Randbereiche sind Werkstoffe bevorzugt aus mikrolegiertem Baustahl oder rostfreiem Stahl mit einer Dicke von 0,5 bis 3 mm vorteilhaft.In an alternative or additional embodiment, it is provided that the casting belt is formed of a plurality of materials, wherein the casting belt, in particular in the edge regions in each case up to a maximum of 25 cm from the edges seen from another Material consists of the middle part of the casting belt. Depending on the desired displacement of the metallurgical center, the casting belt can be constructed in such a way that materials with different thermal conductivities are used selectively in order to influence the local cooling conditions. The difference in thermal conductivity should be at least 20%. As materials in the middle of the band are particularly suitable aluminum, aluminum alloys, copper and copper alloys with a thickness of 0.5 to 3 mm. For the edge regions, materials preferably made of micro-alloyed structural steel or stainless steel with a thickness of 0.5 to 3 mm are advantageous.
Noch eine weitere alternative oder zusätzliche Ausführung sieht vor, dass das Gießband über die Bandbreite eine variierende Dicke aufweist. Die Randbereiche weisen eine gegenüber der Mitte mindestens 10%ig unterschiedliche Dicke auf und der Übergang zwischen den Bereichen unterschiedlicher Dicke kann sowohl stufenweise als auch bevorzugt kontinuierlich erfolgen. Hierdurch wird eine Optimierung der Wärmeabfuhr erzielt.Yet another alternative or additional embodiment provides that the casting tape over the bandwidth has a varying thickness. The edge regions have a thickness which is at least 10% different from the center, and the transition between the regions of different thickness can take place both stepwise and preferably continuously. As a result, an optimization of the heat dissipation is achieved.
In einer weiteren alternativen oder zusätzlichen Ausführung ist vorgesehen, dass ein Gießband mit unterschiedlichen Werkstoffdicken zwischen Mittenbereich und Randbereich in Verbindung mit nichtrostenden Stählen oder FeNi-Legierungen mit einer Dicke von 0,5 bis 3 mm eingesetzt wird. Der Werkstoff ist dabei in den Randbereichen mindestens 10% dicker gewählt als in den Mittenbereichen. Dies bewirkt eine Verringerung der Wärmeabfuhr.In a further alternative or additional embodiment, it is provided that a casting belt having different material thicknesses between the center region and the edge region is used in conjunction with stainless steels or FeNi alloys having a thickness of 0.5 to 3 mm. The material is at least 10% thicker in the edge areas than in the center areas. This causes a reduction in heat dissipation.
Eine weitere alternative oder zusätzliche Ausführung sieht vor, dass das Gießband im Mittenbereich aus einem mikrolegierten Baustahl und im Randbereich aus einem hoch Crhaltigen Stahl oder rostfreien Stahl besteht. Die verringerte Wärmeleitfähigkeit des Randbereiches des Gießbandes vermindert vorteilhaft die Wärmeabfuhr, wodurch eine unerwünscht schnelle Abkühlung der Kantenbereiche vermieden wird.A further alternative or additional embodiment provides that the casting tape in the middle region consists of a micro-alloyed structural steel and in the edge region of a high-Cr steel or stainless steel. The reduced thermal conductivity of the edge region of the casting belt advantageously reduces heat dissipation, thereby avoiding undesirably rapid cooling of the edge regions.
Ferner sieht eine weitere alternative oder zusätzliche Ausführung vor, dass das Gießband vollständig oder partiell mit einer Beschichtung versehen ist, die vorzugsweise BN, ZrO2, TiO2, Al2O3 oder AIN enthält. Die Schichtdicke wird so gewählt, dass ein Wärmeübergang um mindestens 5 % verringert wird. Hierdurch wird ein Wärmeübergang vom gegossenen Vorband zum Gießband vermindert.Furthermore, a further alternative or additional embodiment provides that the casting tape is completely or partially provided with a coating which preferably contains BN, ZrO 2 , TiO 2 , Al 2 O 3 or AlN. The layer thickness is chosen so that a heat transfer is reduced by at least 5%. As a result, a heat transfer from the cast pre-strip is reduced to the casting belt.
Insgesamt führt die verminderte Wärmeabfuhr zu einer Verminderung von Bandverwerfungen (beispielsweise die bekannte U-Form) des erzeugten Vorbandes. Diese Bandverwerfungen entstehen unter anderem durch zu hohe lokale Wärmeabfuhr im Bereich der Bandkanten.Overall, the reduced heat dissipation leads to a reduction of band distortions (for example, the known U-shape) of the produced Vorbandes. Among other things, these belt distortions are caused by excessive local heat dissipation in the area of the strip edges.
Insgesamt kann mit der erfindungsgemäßen horizontalen Bandgießanlage Warmband beziehungsweise Tafelmaterial in der angestrebten Dicke von 6 bis 25 mm (gemessen in der Bandmitte) mit guter Geometrie und verbesserter Oberfläche aus hochmanganhaltigen oder hochaluminiumhaltigen oder hochsiliziumhaltigen Leichtbaustählen oder sonstigem hoch- oder niedriglegiertem Stahl hergestellt werden.Overall, with the inventive horizontal strip casting hot strip or sheet material in the desired thickness of 6 to 25 mm (measured in the band center) with good geometry and improved surface of high manganese or high aluminum or high siliceous lightweight steels or other high or low alloy steel.
Nachfolgend wird die Erfindung an Hand eines in einer Zeichnung dargestellten Ausführungsbeispieles näher erläutert. Es zeigen:
-
eine schematische Seitenansicht einer horizontalen Bandgießanlage,Figur 1 -
Figur 2a eine schematische Draufsicht eines strukturierten Gießbandes, -
Figur 2b eine schematische Draufsicht eines strukturierten Gießbandes und -
Figur 2c eine schematische Draufsicht eines strukturierten Gießbandes.
-
FIG. 1 a schematic side view of a horizontal strip caster, -
FIG. 2a a schematic plan view of a structured casting tape, -
FIG. 2b a schematic plan view of a structured casting belt and -
Figure 2c a schematic plan view of a structured casting belt.
Die in
Derartige horizontale Bandgießanlagen 1 eignen sich besonders zur Erzeugung von endabmessungsnahem Vorband mit Banddicken im Bereich von 6 bis 25 mm (gemessen in der Bandmitte) aus hochmanganhaltigen oder hochaluminiumhaltigen oder hochsiliziumhaltigen Leichtbaustählen, Elektroblechen oder sonstigen hoch- oder niedriglegiertem Stahl.Such
Die
Eine weitere Ausführungsform der strukturierten Oberfläche der Oberseite 4e des Gießbandes 4 zeigt die
Die
Alternativ oder zusätzlich sind neben den dargestellten tränenförmigen und pyramidalen Mustern auch Oberflächenstrukturen mit andersartigen Tränen- und Pyramidenmustern und/oder mit Rauten-, Waben-, Sicken-, Noppen- oder Punktmustern denkbar. Insbesondere können auch trigonal-pyramidale bis hin zu hexagonal-pyramidale Muster und/oder auch Pyramidenstumpf-Muster gewählt werden. Im Falle von Tränenmustern sind die Muster an die DIN 59220 angelehnt. Quersicken und elliptische Noppen weisen ein Verhältnis von Haupt- zu Nebenachse von 1,8 bis 4,8 auf und sind in einem Winkel von 30 bis 90° zur Gießrichtung G oder zueinander rechtwinklig oder alternierend angeordnet. Daneben ist sowohl eine geordnete als auch eine rein zufällige, statistische Anordnung der Muster möglich.Alternatively or additionally, in addition to the illustrated teardrop-shaped and pyramidal patterns, surface structures with different tear and pyramidal patterns and / or with rhombus, honeycomb, bead, knob or dot patterns are also conceivable. In particular, trigonal-pyramidal to hexagonal-pyramidal patterns and / or truncated pyramidal pattern can be selected. In the case of teardrop patterns, the patterns are based on DIN 59220. Cross corrugations and elliptical nubs have a ratio of major to minor axis of 1.8 to 4.8 and are arranged at an angle of 30 to 90 ° to the casting direction G or perpendicular to each other or alternately. In addition, both an ordered and a purely random statistical arrangement of the patterns is possible.
Alternativ oder zusätzlich ist neben der Strukturierung der Oberfläche der Oberseite 4e des Gießbandes 4 mit einem anderen Muster 8 in Randbereichen R des Gießbandes 4 auch eine um 20 bis 75 % höhere Prägetiefe der Muster 7 der strukturierten Oberfläche des Gießbandes 4 in Randbereichen R möglich, wodurch ein Abheben des erstarrenden Vorbandes V im Randbereich R während des Gießverlaufs erfolgt und dadurch der Wärmeübergang im Randbereich R vermindert wird.Alternatively or additionally, in addition to the structuring of the surface of the
- 1 horizontale Bandgießanlage1 horizontal strip caster
- 2 Schmelzgefäß2 melting vessel
- 3 Gießdüse3 pouring nozzle
- 4 Gießband4 casting tape
- 4a vordere Umlenkrolle4a front pulley
- 4b hintere Umlenkrolle4b rear pulley
- 4c oberes Trum4c upper strand
- 4d unteres Trum4d lower strand
- 4e Oberseite4e top
- 5 Einhausung5 enclosure
- 5a Deckenelement5a ceiling element
- 5b Austritt5b exit
- 5c Gaszuleitung5c gas supply
- 5d Gasableitung5d gas discharge
- 6 Kühlvorrichtung6 cooling device
- 7 erstes Muster7 first pattern
- 8 zweites Muster8 second pattern
- G GießrichtungG casting direction
- M MittenbereichM center area
- R RandbereichR border area
- S SchmelzeS melt
- V VorbandV opening band
Claims (14)
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DE102017105570.3A DE102017105570A1 (en) | 2017-03-15 | 2017-03-15 | Horizontal strip caster with optimized casting belt |
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EP3375544B1 EP3375544B1 (en) | 2021-11-24 |
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WO2023039365A1 (en) * | 2021-09-07 | 2023-03-16 | Novelis Inc. | Systems and methods for producing texturized casting molds of a continuous belt caster |
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- 2017-03-15 DE DE102017105570.3A patent/DE102017105570A1/en not_active Withdrawn
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EP3375544B1 (en) | 2021-11-24 |
DE102017105570A1 (en) | 2018-09-20 |
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