EP3375544B1 - Horizontal strip casting installation with optimised casting belt - Google Patents
Horizontal strip casting installation with optimised casting belt Download PDFInfo
- Publication number
- EP3375544B1 EP3375544B1 EP18161095.7A EP18161095A EP3375544B1 EP 3375544 B1 EP3375544 B1 EP 3375544B1 EP 18161095 A EP18161095 A EP 18161095A EP 3375544 B1 EP3375544 B1 EP 3375544B1
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- EP
- European Patent Office
- Prior art keywords
- strip
- casting belt
- casting
- belt
- region
- Prior art date
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- 238000005266 casting Methods 0.000 title claims description 124
- 238000009434 installation Methods 0.000 title description 2
- 239000000463 material Substances 0.000 claims description 30
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 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
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 239000011651 chromium Substances 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims 1
- 239000004411 aluminium Substances 0.000 claims 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- 229910052804 chromium Inorganic materials 0.000 claims 1
- 229910052593 corundum Inorganic materials 0.000 claims 1
- 239000007937 lozenge Substances 0.000 claims 1
- 229910001845 yogo sapphire Inorganic materials 0.000 claims 1
- 230000017525 heat dissipation Effects 0.000 description 11
- 238000001816 cooling Methods 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 238000004049 embossing Methods 0.000 description 9
- 239000000155 melt Substances 0.000 description 8
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 238000007711 solidification Methods 0.000 description 6
- 230000008023 solidification Effects 0.000 description 6
- 229910000851 Alloy steel Inorganic materials 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 229910000746 Structural steel Inorganic materials 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000000265 homogenisation 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
- 238000000034 method Methods 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910017083 AlN Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 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
- 239000002826 coolant Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0631—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 made of metal.
- a horizontal strip caster for producing a pre-strip from steel is known.
- the belt caster has a melting vessel from which the melt is poured through a casting nozzle onto a horizontally rotating casting belt.
- a cooling device is arranged under an upper run of the casting belt.
- the applied melt solidifies to form a pre-belt.
- the strip caster has a housing into which a gas flow is introduced in order to create a reducing or oxidizing atmosphere or an inert gas atmosphere for the melted and the solidifying pre-strip.
- the gas flow 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 is also known for producing a pre-strip from steel.
- a circulating casting belt of the belt caster is coated with a coating compound consisting of a carrier liquid and additives in the area of an upper side facing the pre-belt before a melt is applied.
- additives are a wide variety of metals or metallic oxides / nitrides / borides with which the material properties of the sliver can be influenced in a targeted manner.
- the carrier liquid is removed in a drying unit.
- a firmly adhering coating of the steel strip can alternatively be created, the thickness of which can be used to control the heat transfer between the casting strip and the pre-strip and thus the cooling rate of the melt or the pre-strip.
- German Offenlegungsschrift DE 10 2012 001 469 A1 relates to a horizontal strip caster for producing a pre-strip.
- An applied melt solidifies on a casting belt, which is subjected to conditioning in an inline process after the pre-strip has completely solidified.
- This conditioning comprises at least one of the treatments annealing, drying, straightening, brushing, cleaning, descaling, stretching, smoothing or coating.
- Possible permanent coatings are ceramics or metal / ceramic compounds.
- Dispersion layers made of BN, nitrides, oxides or carbides can be used as renewable coatings.
- the heat transfer between the casting belt and the pre-strip can be controlled on the basis of the coating.
- the disclosure document WO 2007/071225 A1 relates to a horizontal strip caster for producing a pre-strip from, in particular, lightweight structural steel.
- a casting belt is proposed which is provided with a structure in order to reduce the heat transfer and the contact between itself and the strand that has solidified to form a pre-belt.
- This structure has beads running in the longitudinal direction or knobs distributed over the surface, which are embossed into the casting belt from above.
- the German Offenlegungsschrift DE 28 56 472 relates, among other things, to strip casting with a rotating mold for casting aluminum and aluminum alloys.
- the mold has a roughened surface to control the heat transfer when it comes into contact with the molten metal for the first time.
- the mold surface has a roughness pattern, which consists of a regular arrangement of pyramidal or truncated cone-like elevations, so that the melt only the tips of these elevations of the mold surface touched.
- edge defects often occur, which manifest themselves in an edge of the sliver strip that is flattened towards the edge and in cracks in the edge areas.
- the occurrence of flattened edges leads to rolling defects and can thus cause edge cracks.
- the cracks occur in the edge areas of the cast pre-strip and are approximately 30 mm to 100 mm away from the edge.
- a cooling-related deformation of the melt also occasionally leads to mechanical stresses in the structure of the casting belt, which only cause the sliver to lift off the casting belt only locally and which furthermore lead to cracks in the sliver, since the material only comes close to the solidification point at high temperatures has a low hot ductility.
- the bulging then leads to the melt shifting in the direction of the middle of the belt and thus already solidified dendrites to come to the belt surface, on which no lid has been formed up to this point in time.
- This leads to an open porosity, preferably in the areas close to the edge, which leads to surface and structural defects when the tape is processed. These cracks with surface contact also lead to material defects during further processing, which is why the material has to be trimmed and profitability is reduced.
- the formation of a dense, non-open-pored surface can be hindered by the low heat dissipation on the upper side of the strip and a correspondingly lower solidification rate and unfavorable flow boundary layers due to the flow of the atmosphere.
- German patent application DE 10 2005 062854 A1 which is considered to be the most relevant prior art, discloses a system for horizontal strip casting of a pre-strip made of metal, with a casting belt with a central area and laterally adjoining edge areas, the casting belt in the area of a the upper side facing the solidifying pre-strip is equipped with a surface structure, and the surface structure has been created by a stamping deformation of the casting strip.
- the present invention is based on the object of creating a system for the horizontal strip casting of a pre-strip made of metal, with which an improved geometry and surface of the pre-strip, an increased output and thus a substantial improvement in economic efficiency are achieved.
- a system for horizontal strip casting of a pre-strip made of metal has a casting belt with a central area and laterally adjoining edge areas, the casting belt being equipped with a surface structure in the area of an upper side facing the solidifying pre-strip.
- an embossing deformation is understood to mean a manufacturing method in which embossments or elevations are created on the upper side of the casting belt together with oppositely arranged elevations or embossing on the underside of the casting belt. Elevations on the upper side of the casting belt thus correspond at the same point with impressions on the underside of the casting belt or vice versa. In this manufacturing process, there may be deviations between the shape of the embossments or elevations on the top and bottom in order to obtain or optimize the desired shape on the top.
- this embossing process is particularly suitable for the production of casting belts that it is simple and inexpensive and only material is shifted in the thickness direction of the casting belt by the embossing and thus the original dimensions of the casting belt are retained. There are no or hardly any changes in the length and width of the casting belt, which would result in corresponding reworking.
- its surface structure has a first pattern in the central area and a pattern different from the first pattern in the edge areas.
- the claimed casting belt has a different pattern in the edge areas up to a maximum of 25 cm from the edge in the direction of the middle of the belt and an embossing depth of the structure that is 20 to 75% higher.
- the uniform heat dissipation is advantageously effected by preventing the cast pre-strip from lifting off.
- the homogenization of the cooling conditions across the strip width counteracts any deformation of the cast pre-strip (U-shape).
- a different solidification of the pre-strip caused by uneven heat transfer is counteracted and local porosities and voids, which often occur linearly in the casting direction, are thus avoided.
- an improvement in the quality, the surface and the geometry of a pre-strip produced, in particular in the case of alloys with low Al contents - preferably Al ⁇ 0.8% by weight - is achieved through the homogenization of the cooling conditions.
- the output is also increased and thus the profitability.
- the casting belt is made of a material with a material, at least in the region of an upper side facing the solidifying preliminary belt
- Particularly suitable materials are aluminum, an aluminum alloy, copper or a copper alloy.
- casting tape material also enables the casting tape thickness to be increased with the same or improved heat dissipation, which counteracts buckling of the casting tape and, in particular, homogenizes the heat dissipation over the surface.
- the casting belt is provided with a surface structure at least in the area of an upper side facing the solidifying pre-belt and the surface structure is preferably a teardrop, pyramid, diamond, bead or point pattern with a depth of 0.075 to 0.8 mm in the sense of embossments or elevations.
- the surface structure is preferably a teardrop, pyramid, diamond, bead or point pattern with a depth of 0.075 to 0.8 mm in the sense of embossments or elevations.
- a casting belt with reduced thermal conductivity is used. Due to the reduced thermal conductivity of the casting belt, the downward dissipation of heat is delayed and thus the proportion of solidification from the upper side of the preliminary strip is increased and the formation of a cover on the upper side of the preliminary strip is promoted during casting. This is particularly advantageous in the case of steels with an increased tendency to surface defects and open porosity, in which a casting belt made of an alloy with a higher Thermal conductivity would otherwise cause the metallurgical center (area of residual solidification) in the cast sliver to shift towards the surface of the strip.
- the surface-sensitive grades include, in particular, alloys with an Al content of less than 0.8% by weight and a solidification interval of greater than 30 ° C., as well as steels with a high C and high Si content.
- the casting belt is made of a material with a thermal conductivity of less than 35 W / mK (at 40 ° C) and a casting belt thickness of 0, to reduce and delay the downward heat dissipation, at least in the area of an upper side facing the solidifying pre-strip. 5 to 3 mm.
- Stainless steels, steels with a high Cr content and FeNi alloys are particularly suitable as materials.
- the low expansion coefficients of, for example, FeNi alloys, which additionally counteract buckling of the pre-strip, are particularly advantageous.
- the dense oxide layer especially Cr 2 O 3 ) improves the separation behavior between the cast strip and the cast pre-strip.
- the casting belt is made of several materials, the casting belt in particular in the edge regions in each case up to a maximum of 25 cm from the edges viewed from another
- the casting belt can be constructed in such a way that materials with different thermal conductivities are used in a targeted manner in order to influence the local cooling conditions.
- the difference in thermal conductivity should be at least 20%.
- Aluminum, aluminum alloys, copper and copper alloys with a thickness of 0.5 to 3 mm are particularly suitable as materials in the middle of the strip.
- materials made of micro-alloyed structural steel or stainless steel with a thickness of 0.5 to 3 mm are advantageous.
- the casting belt has a varying thickness over the belt width.
- the edge areas have a thickness that is at least 10% different from the center, and the transition between the areas of different thicknesses can take place both gradually and preferably continuously. This optimizes the heat dissipation.
- a casting belt with different material thicknesses between the central area and the edge area is used in conjunction with stainless steels or FeNi alloys with a thickness of 0.5 to 3 mm.
- the material is selected to be at least 10% thicker in the edge areas than in the central areas. This has the effect of reducing the heat dissipation.
- the casting belt consists of a microalloyed structural steel in the middle area and of a high Cr-containing steel or stainless steel in the edge area.
- the reduced thermal conductivity of the edge area of the casting belt advantageously reduces the heat dissipation, as a result of which an undesirably rapid cooling of the edge areas is avoided.
- the casting belt 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 heat transfer is reduced by at least 5%. This reduces heat transfer from the cast pre-strip to the cast strip.
- the reduced heat dissipation leads to a reduction in strip warpage (for example the known U-shape) of the pre-strip produced.
- This belt warping is caused, among other things, by excessive local heat dissipation in the area of the belt edges.
- hot strip or sheet material in the desired thickness of 6 to 25 mm (measured in the middle of the strip) with good geometry and an improved surface can be produced from high-manganese or high-aluminum or high-silicon lightweight steels or other high or low-alloy steel.
- FIG. 1 The schematic side view of a horizontal strip casting system 1 shown essentially consists of a melting vessel 2, a casting nozzle 3, a casting belt 4 and a housing 5.
- Liquid melt S in particular metal melt
- the endless casting belt 4 runs in a casting direction G around a front deflection roller 4a and a rear deflection roller 4b spaced therefrom in the casting direction G and conveys the solidifying pre-strip V in the casting direction G. on which the sliver V solidifies, and divide a lower strand 4d between the front and rear deflection rollers 4a, 4b.
- a strand 4c, 4d is understood to mean that part of the casting belt 4 extending between the deflection rollers 4a, 4b.
- the casting belt 4 runs essentially horizontally in the area of the upper run 4c and is cooled from below in the area of the upper run 4c by means of a cooling device 7 which covers almost the entire upper run 4c with the exception of short areas at the transition to the deflection rollers 4a, 4b acted upon by coolant, preferably water.
- coolant preferably water.
- side delimitation elements which are usually present and extend in the casting direction G for the sliver V solidifying on the upper run 4c are not shown.
- the housing 5 of the horizontal strip caster 1 encloses the solidifying sliver V in an area between the casting nozzle 3 and an outlet 5b for the solidified sliver V from the housing 5.
- the housing 5 is provided in the usual way 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 cast and to solidify to the pre-strip V.
- a gas feed line 5c and a gas discharge line 5d are connected to the housing 5 in the area of an upper and essentially horizontally extending ceiling element 5a of the housing 5.
- the gas supply line 5c is located in the area of the outlet 5b and the gas discharge line 5d in the area of the casting nozzle, so that the gas flows against the casting direction G in countercurrent to the solidifying pre-strip V or vice versa.
- Such horizontal strip casting systems 1 are particularly suitable for the production of near-net-shape pre-strip with strip thicknesses in the range from 6 to 25 mm (measured in the middle of the strip) from high-manganese or high-aluminum or high-silicon lightweight steels, electrical sheets or other high or low-alloy steel.
- the Figure 2a shows a structured surface of an upper side 4e of the casting belt 4 of the belt casting installation 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 embossments or elevations.
- teardrop-shaped patterns 7, 8 with a depth or height of 0.075 to 0.8 mm in the sense of embossments or elevations.
- a first pattern 7 in a central area M on the surface of the casting belt 4 differs from a second pattern 8 of the surface of the casting belt 4 in the edge regions R laterally adjoining the central region M 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 to a reduced heat transfer in the edge areas R, compared to the central area M.
- the embossments or elevations opposite, elevations or embossings with essentially the same shape can be found in the opposite way. In this manufacturing process, there may be deviations between the shape of the embossments or elevations on the top and bottom in order to obtain the desired shape on the top.
- FIG Figure 2b Another embodiment of the structured surface of the upper side 4e of the casting belt 4 is shown in FIG Figure 2b , in which a double-arranged teardrop-shaped pattern 7, 8 - a so-called. Duet pattern - with a depth or height of 0.075 to 0.8 mm in the sense of embossments or elevations.
- the further configuration is comparable to that previously Figure 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 laterally adjoining pyramids with a square base with a depth or height of 0.075 to 0.8 mm in the sense of embossments or elevations is.
- the further configuration is comparable to that previously Figure 2a described.
- teardrop-shaped and pyramidal patterns surface structures with other types of teardrop and pyramid patterns and / or with diamond, honeycomb, beading, knob or dot patterns are also conceivable.
- trigonal-pyramidal to hexagonal-pyramidal patterns and / or also truncated pyramidal patterns can be selected.
- Transverse beads and elliptical knobs 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 at right angles to one another or alternately.
- both an ordered and a purely random, statistical arrangement of the patterns is possible.
- a 20 to 75% higher embossing depth of the pattern 7 of the structured surface of the casting belt 4 in edge areas R is possible, whereby a lifting of the solidifying pre-strip V in the edge area R during the casting process takes place and thereby the heat transfer in the edge area R is reduced.
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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 made 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 sliver strip with a strip thickness of 6 to 25 mm, edge defects often occur, which manifest themselves in an edge of the sliver strip that is flattened towards the edge and in cracks in the edge areas. The occurrence of flattened edges leads to rolling defects and can thus cause edge cracks. The cracks occur in the edge areas of the cast pre-strip and are approximately 30 mm to 100 mm away from the edge. A cooling-related deformation of the melt also occasionally leads to mechanical stresses in the structure of the casting belt, which only cause the sliver to lift off the casting belt only locally and which furthermore lead to cracks in the sliver, since the material only comes close to the solidification point at high temperatures has a low hot ductility. The bulging then leads to the melt shifting in the direction of the middle of the belt and thus already solidified dendrites to come to the belt surface, on which no lid has been formed up to this point in time. This leads to an open porosity, preferably in the areas close to the edge, which leads to surface and structural defects when the tape is processed. These cracks with surface contact also lead to material defects during further processing, which is why the material has to be trimmed and profitability is reduced. The formation of a dense, non-open-pored surface can be hindered by the low heat dissipation on the upper side of the strip and a correspondingly lower solidification rate and unfavorable flow boundary layers due to the flow of the atmosphere.
Die deutsche Patentanmeldung
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 of creating a system for the horizontal strip casting of a pre-strip made of metal, with which an improved geometry and surface of the pre-strip, an increased output and thus a substantial improvement in economic efficiency are 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 12 angegebenThis object is achieved by a system for horizontal strip casting of a pre-strip made of metal with the features of
Erfindungsgemäß weist eine Anlage zum horizontalen Bandgießen eines Vorbandes aus Metall ein Gießband mit einem Mittenbereich und seitlich daran anschließenden Randbereichen auf, 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 wird dadurch erreicht, dass die Oberflächenstruktur durch ein durchprägendes Umformen des Gießbandes entstanden ist.According to the invention, a system for horizontal strip casting of a pre-strip made of metal has a casting belt with a central area and laterally adjoining edge areas, the casting belt being equipped with a surface structure in the area of an upper side facing the solidifying pre-strip. An improved geometry and surface of the pre-strip, an increased output and thus a significant improvement in economic efficiency are achieved by the fact that the surface structure is created by a stamping deformation of the casting strip.
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 deformation is understood to mean a manufacturing method in which embossments or elevations are created on the upper side of the casting belt together with oppositely arranged elevations or embossing on the underside of the casting belt. Elevations on the upper side of the casting belt thus correspond at the same point with impressions on the underside of the casting belt or vice versa. In this manufacturing process, there may be deviations between the shape of the embossments or elevations on the top and bottom in order to obtain or optimize the desired shape on the top. Overall, this embossing process is particularly suitable for the production of casting belts that it is simple and inexpensive and only material is shifted in the thickness direction of the casting belt by the embossing and thus the original dimensions of the casting belt are retained. There are no or hardly any changes in the length and width of the casting belt, which would result in corresponding reworking.
Weiterhin gilt für das beanspruchte Gießband, dass seine Oberflächenstruktur in dem Mittebereich ein erstes Muster und in den Randbereichen ein von dem ersten Muster verschiedenes Muster aufweist.Furthermore, it applies to the claimed casting belt that its surface structure has a first pattern in the central area and a pattern different from the first pattern in the edge areas.
Schließlich weist das beanspruchte Gießband im Bereich einer dem erstarrenden Vorband zugewandten Oberseite in den 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 auf.Finally, in the area of an upper side facing the solidifying pre-strip, the claimed casting belt has a different pattern in the edge areas up to a maximum of 25 cm from the edge in the direction of the middle of the belt and an embossing depth of the structure that is 20 to 75% higher.
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 strip material and / or the casting strip geometry and structure, the uniform heat dissipation is advantageously effected by preventing the cast pre-strip from lifting off. The homogenization of the cooling conditions across the strip width counteracts any deformation of the cast pre-strip (U-shape). In particular, a different solidification of the pre-strip caused by uneven heat transfer is counteracted and local porosities and voids, which often occur linearly in the casting direction, are thus avoided. Overall, an improvement in the quality, the surface and the geometry of a pre-strip produced, in particular in the case of alloys with low Al contents - preferably Al <0.8% by weight - is achieved through the homogenization of the cooling conditions. The output is also increased and thus the profitability.
Vorzugsweise ist vorgesehen, dass das Gießband zumindest im Bereich einer dem erstarrenden Vorband zugewandten Oberseite aus einem Werkstoff mit einerIt is preferably provided that the casting belt is made of a material with a material, at least in the region of an upper side facing the solidifying preliminary belt
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.Thermal conductivity of greater than 90 W / mK (at 40 ° C), in particular greater than 100 W / mK (at 40 ° C), is produced and has a casting tape thickness of 0.5 to 3 mm, in particular 1 to 3 mm. Particularly suitable materials are 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 casting tape material also enables the casting tape thickness to be increased with the same or improved heat dissipation, which counteracts buckling of the casting tape and, in particular, homogenizes 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 belt is provided with a surface structure at least in the area of an upper side facing the solidifying pre-belt and the surface structure is preferably a teardrop, pyramid, diamond, bead or point pattern with a depth of 0.075 to 0.8 mm in the sense of embossments or elevations. This results in a stiffening of the structure and the downward dissipation of heat is increased and homogenized, and heat conduction is also improved within the casting belt. The result is that, following the production by means of stamping deformation, the casting belt is arranged on an underside of the casting belt, elevations or embossments which lie opposite the embossings or elevations on the upper side of the casting belt.
Alternativ oder zusätzlich ist auch eine Kombination von Al- oder Cu-haltigem Gießbandwerkstoff und einer Oberflächenstrukturierung möglich.As an alternative or in addition, a combination of Al- or Cu-containing cast strip material and a surface structure is also possible.
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 AI-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 casting belt with reduced thermal conductivity is used. Due to the reduced thermal conductivity of the casting belt, the downward dissipation of heat is delayed and thus the proportion of solidification from the upper side of the preliminary strip is increased and the formation of a cover on the upper side of the preliminary strip is promoted during casting. This is particularly advantageous in the case of steels with an increased tendency to surface defects and open porosity, in which a casting belt made of an alloy with a higher Thermal conductivity would otherwise cause the metallurgical center (area of residual solidification) in the cast sliver to shift towards the surface of the strip. The surface-sensitive grades include, in particular, alloys with an Al content of less than 0.8% by weight and a solidification interval of greater than 30 ° C., as well as steels with a high C and high Si content.
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.It is preferably provided that the casting belt is made of a material with a thermal conductivity of less than 35 W / mK (at 40 ° C) and a casting belt thickness of 0, to reduce and delay the downward heat dissipation, at least in the area of an upper side facing the solidifying pre-strip. 5 to 3 mm. Stainless steels, steels with a high Cr content and FeNi alloys are particularly suitable as materials. The low expansion coefficients of, for example, FeNi alloys, which additionally counteract buckling of the pre-strip, are particularly advantageous. Also advantageous in the case of stainless steel or steel with a high Cr content, the dense oxide layer (especially Cr 2 O 3 ) improves the separation behavior between the cast 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 anderenIn an alternative or additional embodiment it is provided that the casting belt is made of several materials, the casting belt in particular in the edge regions in each case up to a maximum of 25 cm from the edges viewed from another
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.Material exists as 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 in a targeted manner in order to influence the local cooling conditions. The difference in thermal conductivity should be at least 20%. Aluminum, aluminum alloys, copper and copper alloys with a thickness of 0.5 to 3 mm are particularly suitable as materials in the middle of the strip. For the edge areas, materials 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 belt has a varying thickness over the belt width. The edge areas have a thickness that is at least 10% different from the center, and the transition between the areas of different thicknesses can take place both gradually and preferably continuously. This optimizes the heat dissipation.
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 with different material thicknesses between the central area and the edge area is used in conjunction with stainless steels or FeNi alloys with a thickness of 0.5 to 3 mm. The material is selected to be at least 10% thicker in the edge areas than in the central areas. This has the effect of reducing the 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.Another alternative or additional embodiment provides that the casting belt consists of a microalloyed structural steel in the middle area and of a high Cr-containing steel or stainless steel in the edge area. The reduced thermal conductivity of the edge area of the casting belt advantageously reduces the heat dissipation, as a result of which an undesirably rapid cooling of the edge areas is avoided.
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 belt 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 heat transfer is reduced by at least 5%. This reduces heat transfer from the cast pre-strip to the cast strip.
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 in strip warpage (for example the known U-shape) of the pre-strip produced. This belt warping is caused, among other things, by excessive local heat dissipation in the area of the belt 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 horizontal strip caster according to the invention, hot strip or sheet material in the desired thickness of 6 to 25 mm (measured in the middle of the strip) with good geometry and an improved surface can be produced from high-manganese or high-aluminum or high-silicon 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.
-
Figure 1 a schematic side view of a horizontal strip caster, -
Figure 2a a schematic top view of a structured casting belt, -
Figure 2b a schematic top view of a structured casting belt and -
Figure 2c a schematic top 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 horizontal
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 teardrop-shaped and pyramidal patterns shown, surface structures with other types of teardrop and pyramid patterns and / or with diamond, honeycomb, beading, knob or dot patterns are also conceivable. In particular, trigonal-pyramidal to hexagonal-pyramidal patterns and / or also truncated pyramidal patterns can be selected. In the case of teardrop samples, the samples are based on DIN 59220. Transverse beads and elliptical knobs 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 at right angles to one another or alternately. In addition, both an ordered and a purely random, statistical arrangement of the patterns is possible.
Erfindungsgemäß 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.According to the invention, in addition to the structuring of the surface of the top 4e of the casting
- 11
- horizontale Bandgießanlagehorizontal strip caster
- 22
- SchmelzgefäßMelting vessel
- 33
- GießdüsePouring nozzle
- 44th
- GießbandCasting tape
- 4a4a
- vordere Umlenkrollefront pulley
- 4b4b
- hintere Umlenkrollerear pulley
- 4c4c
- oberes Trumupper run
- 4d4d
- unteres Trumlower strand
- 4e4e
- OberseiteTop
- 55
- EinhausungEnclosure
- 5a5a
- DeckenelementCeiling element
- 5b5b
- Austrittexit
- 5c5c
- GaszuleitungGas supply line
- 5d5d
- GasableitungGas discharge
- 66th
- KühlvorrichtungCooling device
- 77th
- erstes Musterfirst pattern
- 88th
- zweites Mustersecond pattern
- GG
- GießrichtungPouring direction
- MM.
- MittenbereichMiddle area
- RR.
- RandbereichEdge area
- SS.
- Schmelzemelt
- VV
- VorbandOpening act
Claims (12)
- Plant for horizontal belt-casting of a pre-strip (V) of metal, with a casting belt (4) with a centre region (M) and edge regions (R) laterally connected therewith, wherein the casting belt (4) is furnished in the region of an upper side (4e), which faces the hardening pre-strip (V), with a surface structure which is created by a pressing-through deformation of the casting belt (4),
characterised in thatthe surface structure in the centre region (M) is different from the surface structure in the edge region (R) andthe casting belt (4) at least in the region of an upper side (4e), which faces the hardening pre-strip (V), has in each of the edge regions (R) up to at most 25 centimetres from the edge as seen in the direction of the belt centre a different pattern and a pressing depth of the structure which is 20 to 75% higher. - Plant according to claim 1, characterised in that the casting belt (4) at least in the region of an upper side (4e), which faces the hardening pre-strip, is provided with a surface structure and the surface structure preferably has a drop-shaped, pyramidal, lozenge, bead-shaped or punctiform pattern with a depth of 0.075 to 0.8 millimetres in the sense of impressions or elevations.
- Plant according to claim 2, characterised in that following production by pressing-through deformation [the casting belt (4)] there are arranged on a lower side of the casting belt (4) elevations or impressions which are opposite the impressions or elevations on the upper side (4e) of the casting belt (4).
- Plant according to at least one of claims 1 to 3, characterised in that the casting belt at least in the region of an upper side (4e), which faces the hardening pre-strip, is produced from a material with a thermal conductivity of more than 90 W/mK (at 40° C).
- Plant according to at least one of claims 1 to 3, characterised in that the casting belt at least in the region of an upper side (4e), which faces the hardening pre-strip, is produced from a material with a thermal conductivity greater than 100 W/mK (at 40° C).
- Plant according to claim 4 or 5, characterised in that the material is aluminium, an aluminium alloy, copper or a copper alloy.
- Plant according to at least one of claims 1 to 3, characterised in that the casting belt (4) at least in the region of an upper side (4e), which faces the hardening pre-strip (V), is produced from a material with a thermal conductivity of less 35 W/mK (at 40° C).
- Plant according to claim 7, characterised in that the material is a stainless steel, a steel with high chromium content or an FeNi alloy.
- Plant according to at least one of claims 1 to 8, characterised in that the casting belt (4) at least in the region of an upper side (4e), which faces the hardening pre-strip (V), is made from several materials, wherein the casting belt (4) in each of the edge regions (R) up to at most 25 centimetres as seen from the edges consists of a different material with a thermal conductivity differing by at least 20% from the centre region of the casting belt (4).
- Plant according to at least one of claims 1 to 8, characterised in that the casting belt (4) at least in the region of an upper side (4e), which faces the hardening pre-strip (V), has a varying thickness over the belt width and the edge regions (R) have a thickness different by at least 10% relative to the centre regions (M) and the transition between the regions of different thickness takes place not only in steps, but also continuously.
- Plant according to at least one of claims 1 to 10, characterised in that the casting belt (4) has different material thicknesses between centre region (M) and edge region (R) in conjunction with stainless steels or FeNi alloys and the material in the edge regions (R) is selected to be at least 10% thicker than in the centre regions.
- Plant according to at least one of claims 1 to 11, characterised in that the casting belt (4) at least in the region of an upper side (4e), which faces the hardening pre-strip (V), is completely or partially provided with a coating which contains BN, ZrO2, TiO2, Al2O3 or AIN.
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FR1364717A (en) * | 1963-05-14 | 1964-06-26 | Duralumin | Method and machine for casting allowing the improvement of the surface condition and blanks obtained by this method |
CH633206A5 (en) | 1978-11-03 | 1982-11-30 | Alusuisse | CHOCOLATE WITH Roughened Surface For Casting Metals. |
US4212343A (en) * | 1979-03-16 | 1980-07-15 | Allied Chemical Corporation | Continuous casting method and apparatus for structurally defined metallic strips |
DE3247145A1 (en) * | 1982-12-21 | 1984-07-05 | Held, Kurt, 7218 Trossingen | METAL CONTINUOUS PRESS RIBBON WITH STRUCTURED SURFACE FOR DOUBLE BAND PRESSES |
JPS6195750A (en) * | 1984-10-15 | 1986-05-14 | Nippon Kokan Kk <Nkk> | Continuous casting machine |
JPH0763813B2 (en) * | 1987-02-04 | 1995-07-12 | 新日本製鐵株式会社 | Method and apparatus for continuous casting of metal ribbon |
JPH0539807Y2 (en) * | 1988-01-21 | 1993-10-08 | ||
JPH06304715A (en) * | 1993-04-21 | 1994-11-01 | Nippon Steel Corp | Belt having recessed part of projecting part on surface for cast strip continuous caster and formation of recessed part and projecting part onto this belt |
DE4407873C2 (en) | 1994-03-04 | 1997-04-10 | Mannesmann Ag | Method and device for cooling molten steel |
WO1997014520A1 (en) * | 1995-10-16 | 1997-04-24 | Kaiser Aluminum & Chemical Corporation | Casting belts for use in casting of metals and method of manufacturing same |
DE102005062854A1 (en) | 2005-12-23 | 2007-07-05 | Salzgitter Flachstahl Gmbh | Method and device for producing metallic hot strips, in particular made of lightweight steel |
DE102011010040B3 (en) | 2011-02-02 | 2012-08-02 | Salzgitter Flachstahl Gmbh | Method and device for producing a cast strip of steel with material properties adjustable over the strip cross section and the strip length |
DE102012001469A1 (en) | 2012-01-19 | 2013-07-25 | Salzgitter Flachstahl Gmbh | Producing metal cast strip useful in high-lightweight steels, comprises e.g. introducing a molten steel into conveyor belt, and performing an inline conditioning of conveyor belt to run side boundaries along the upper run with conveyor belt |
-
2017
- 2017-03-15 DE DE102017105570.3A patent/DE102017105570A1/en not_active Withdrawn
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2018
- 2018-03-09 EP EP18161095.7A patent/EP3375544B1/en active Active
Non-Patent Citations (1)
Title |
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None * |
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Publication number | Publication date |
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EP3375544A1 (en) | 2018-09-19 |
DE102017105570A1 (en) | 2018-09-20 |
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