Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
  • B22D11/0637—Accessories therefor
  • B22D11/0648—Casting surfaces
  • B22D11/066—Side dams

Definitions

• the invention relates to a device for strip casting of metallic products with at least one strip running device, on the circulating belt a molten metal can be applied, and with two side limiting devices, in which the belt running device and the two side limiting devices form a solidification space for the solidifying molten metal, and wherein the two side boundary devices each comprise a multiplicity of mutually cooperating wall elements each having a wall side facing the solidification space, a wall part made of copper or an alloy comprising a surface (30) interacting with the molten metal (17) being arranged thereon.
• a device for strip casting with a peripheral mold in which the mold comprises at least one rotating mold with a plate chain, which consists of individual mutually hinged plates.
• These plates are composed of partially determining shell molds made of copper and steel supports, whereby the material copper good heat conduction for more intensive cooling of a cast strip is achieved.
• a system for strip casting which, inter alia, a horizontally circulating conveyor belt and mold parts for Shaping of narrow sides of continuous casting molds, in which the mold parts rotate with the conveyor belt. These mold parts are composed of individual segments, which interlock to seal against a solidifying melt.
• a continuous casting machine is shown in WO 97/06906 A1, which is characterized by a motor-driven, horizontally extending and cooled endless belt made of a thermally conductive material, such as copper.
• the endless belt has lateral dam elements, which can move with the endless belt, but can also stand still. By means of the lateral dam elements, a liquid metal cast onto the endless belt can in particular be guided laterally until it solidifies.
• the dam elements are transversely movable, so that different bandwidths can be adjusted.
• JP 571 18843 A discloses a rotating mold having a rotary casting ring and an endless metal belt comprising cold-formed copper side plates and bottom plates which are welded together by an electron beam method so as to deform as little as possible during welding.
• the invention has for its object to further develop generic Bandg phonevorsesen.
• the object of the invention is achieved by a device for strip casting of metallic products with at least one strip running device, on whose circulating band a molten metal can be applied, and with two side boundary devices, in which the strip running device and the two side boundary devices form a solidification space for the solidifying molten metal herein, and wherein the two side boundary means each comprise a plurality of mutually cooperating wall elements each having a wall facing the solidification space, wherein a wall portion made of copper or an alloy thereof comprising a surface interacting with the molten metal surface is arranged on the wall facing the solidification space, and wherein this interacting with the molten metal surface is at least partially modified.
• This wall part interacting with the molten metal may be formed integrally with the wall element delimiting the solidification space, for example in that the wall element and the wall part are made of a common block element made of copper or an alloy thereof.
• the wall element can be attached to the wall element and a wall part, which is formed as a further component.
• This wall part is in this case then supported by the wall element, wherein the wall part is also made of copper or an alloy thereof.
• the present device is preferably a strip casting device by means of which continuous casting of metals is possible.
• this strip casting device is a component of a Hazelett strip caster.
• metallic products encompasses all products which can be produced by casting by strip casting, for example, such metallic products include any type of slab, ie thin, medium or thick slab, or the like
• wall element describes a dam element by means of which the solidification space is delimited laterally on the circulating belt, wherein this wall element preferably migrates with the belt.
• the wall element can be moved with respect to the circulating belt at the same speed or at a relative speed.
• a plurality of wall elements are hinged together to form a side boundary means.
• At least partially modified surface in the context of the invention describes a surface facing the solidification space or the molten metal, which comprises at least one surface area which is configured such that it has different properties than a remaining surface area of the wall portion or at least in some areas modified surface. It is understood that such a metal surface facing the modified surface can be realized in many ways.
• the solidification space is limited by this at least partially modified surface.
• this at least partially modified surface is placed on the wall part or on the respective wall element, that it comes into contact with the molten metal, so it interacts with this.
• this surface which interacts with the molten metal, has a surface which is at least partially modified with respect to at least one further wall side of the wall element.
• the wall element with an at least partially modified surface interact particularly advantageously with the molten metal, whereby, in particular, the present wall element differs from previously known dam elements.
• this surface interacting with the molten metal has an at least partially mechanically and thermally wear-reducing surface.
• the previous surfaces of wall parts of the wall element which come into contact with the solidifying molten metal consist of copper or of an alloy thereof, so that the thermal energy inherent in the molten metal can advantageously be dissipated via this wall part or the wall element.
• the surface or wall portion is relatively susceptible to wear, so that the wall part formative wall element must be frequently replaced again. If the wall part bordering the solidification space or that or the wall part coming into operative contact with the solidifying molten metal is characterized by the modified surface present, the service life of the wall element can be significantly increased. Cumulatively or alternatively, it is advantageous if this surface interacting with the molten metal has an at least partially changed surface structure. Such a changed surface structure may be formulated, for example, by a differently shaped roughness or the like of the modified surface. Depending on how the roughness is selected, the or the wall part can interact more intensively with the molten metal, whereby, for example, a heat transfer from the molten metal to the wall element can be improved.
• the entire surface of the wall part coming into operative contact with the staring molten metal may be modified accordingly.
• the wall part facing the molten metal or its wall can be completely modified with its relevant surface in the sense of the invention.
• this surface can also be modified only in certain areas in order to realize, for example, different properties combined or to be able to use specific surface properties in a more locally targeted manner.
• this interacting with the molten metal surface has at least two mutually different surface areas, these two different surface areas have different properties.
• mechanically less heavily loaded surface areas of the affected wall portion only a surface of copper or an alloy thereof, while mechanically more stressed surface areas of the affected wall part are optimized in terms of their hardness.
• the at least partially modified surface of the metal melt interacting with the wall part have other physical or haptic properties.
• a plurality of fixed, but interchangeable arranged on the wall part surface elements are provided, so that this or this wall part is modified at several points or surface areas accordingly. So that the wall part or parts can be provided at different locations with a surface facing the molten metal, at least partially modified surface, without being completely provided with the modified surface, it is advantageous if this interacts with the molten metal wall part a plurality of spaced-apart surface regions having a modified surface.
• this wall part interacting with the molten metal has one or more exchangeable edge and / or corner elements which have a modified surface in relation to other surface areas of the wall part.
• at the edges and corners of the or the wall part is mechanically particularly highly loaded, so that there in particular a harder surface is desirable in order to reduce the susceptibility to wear significantly.
• a movable side limiting device can be structurally simply reinforced, for example with optimized, that is to say harder, materials, which are preferably designed to be quick to change. It is also advantageous if the at least partially modified surface comprises a surface element which is fixedly arranged on this wall part interacting with the molten metal, but which is exchangeable.
• the wall element in the relevant areas can also be equipped by interchangeable elements which carry the present modified surface.
• Associated elements or surface elements can be attached to the wall element as plates or the like at fastening points provided for this purpose, wherein these surface elements configure the surface of the wall part modified in the sense of the invention.
• the surface elements are screwed to the wall element for this purpose.
• the present invention is also characterized by exchangeable wear areas.
• this surface which is at least partially modified, is permanently arranged on the wall part. Even if the surface element is replaceable, the present at least partially modified surface can withstand more than one revolution, namely a large number of such cycles, along the solidification line before it is closed and must be renewed.
• the wall part interacting with the molten metal differs from further wall sides of the wall element and in particular, for example, surfaces sprayed temporarily with a coolant.
• the at least partially modified surface in the sense of the invention is permanently arranged on the wall part.
• the surface modified at least in some areas comprises an insoluble coating.
• the present invention differs quite considerably from only temporarily by cooling, contact, and / or lubricant acted upon wall elements, since it is in the present case a permanent coating, by means of which the or the present wall part is at least partially refined.
• Conventional cooling, contact, and / or lubricants must be sprayed on the wall element again approximately after each circulation in order to be effectively arranged on the wall element. It is irrelevant which type and by which method the insoluble coating is or is applied.
• a further wall side of the wall element comprises a wall part which interacts with the molten metal and which has the at least partially modified surface.
• FIG. 1 shows schematically a plan view of an apparatus for strip casting of metallic products from a molten metal with a circumferential band and with circumferential wall elements, which on one interacting with the molten metal wall part of this molten metal facing, at least partially modified surface;
• Figure 2 schematically shows a first wall element with a with the
• Metal melt interacting wall portion comprising a modified at least in the corner regions of the wall element surface which interacts with the molten metal
• FIG. 3 schematically shows an alternative further wall element with a wall part interacting with the molten metal and comprising a wall part
• the strip casting device 1 shown schematically in FIG. 1 for strip casting of metallic products 2, as in this exemplary embodiment of a cast strip 3, is part of a strip casting plant 4, not shown further here, which for example still has a rolling device (not shown) downstream of the strip casting device 1, etc includes.
• the strip casting apparatus 1 essentially has a strip running device 5 with a circulating belt 6, which circulates endlessly about two deflection rollers 8 and 9 driven by a motor 7 in such a way that its upper run 10 runs in the conveying direction 11. Furthermore, the strip casting apparatus 1 has two side boundary devices 12 and 13, which are placed laterally of the circulating belt 6.
• a substantially horizontally extending solidification section 15 is formed along which a molten metal 17 fed through a feed system 16 of the solidification section 15 cools down and solidifies to form the metallic product 2.
• the two side limiting devices 12 and 13 have in each case via a plurality of mutually interacting wall elements 20 (only exemplified), which in this embodiment in each case consist of an alloyed copper block 21 (numbered only by way of example).
• the present wall elements 20 are wall elements 20 which are movable with the circulating belt 6 and / or correspondingly entrained dam elements (not separately numbered) which are moved parallel to the circulating belt 6 at least along the solidification path 15.
• a movable dam is configured on both sides of the circulating belt 6 by means of the plurality of mutually interacting wall elements 20.
• a solidification space 22 is thus formed along the substantially horizontally extending solidification path 15 is formed, in which the molten metal 17 is poured to solidify to the metallic product 2.
• the individual wall elements 20 cooperate with the circulating belt 6 in such a way that the molten metal 17 can not or only to a negligible extent escape to the sides 18 and 19.
• the solidification space 22 is bounded by the band surface 23 facing the molten metal 17 and wall sides 24 facing the molten metal 17 (numbered only by way of example) by the wall elements 20.
• the wall elements 20 only one wall part over the height (see in particular FIG. 2) of the wall side 24 or of the wall element 20 comes into direct contact with the molten metal 17, the wall part in this exemplary embodiment being integral with the alloyed copper block 21 configuring the actual wall element 20 is trained.
• the thermal energy inherent in the molten metal 17 can be dissipated particularly effectively via the two side-limiting devices 12 and 13.
• a skirt 26 (see in particular FIG. 2) of a holding device 27 for holding the individual wall elements 20 is provided, which is not part of the wall part 25 coming into operative contact with the molten metal 17.
• the present strip casting apparatus 1 is characterized in that this wall part interacting with the molten metal 17 has an at least partially modified surface 30 (only exemplified) which faces the solidification space 22, that is, interacts with the molten metal 17 interactively.
• the solidification chamber 22 facing, at least partially modified surface 30 is designed substantially differently than other wall sides (not numbered) of the respective wall element 20 and the rest of its surfaces, wherein the at least partially modified surface 30 is formed in this embodiment, thermal and mechanical wear-reducing ,
• the wall side 24 facing the solidification space 22 has at least two mutually different surface areas 31 and 32, these two different surface areas 31 and 32 having different properties.
• the first surface region 31 is the smooth copper surface 28, ie a relatively smooth surface structure 33, which in this exemplary embodiment is realized directly by the alloyed copper block 21 of the wall element 20.
• the further surface area 32 (numbered as an example only) is a harder surface structure 34 (numbered only by way of example) than the softer, smooth copper surface 28, which is provided by four interchangeable, interchangeable surface elements 35, 36, 37 and 38 the interacting with the molten metal 17 wall portion 25 is configured.
• the surface elements 35, 36, 37 and 38 face the solidification space 22 or the molten metal 17.
• the four spaced-apart, interchangeable surface elements 35, 36, 37 and 38 are in this case in the four corners 39 (numbered only as an example) of the Wall part 25 is placed so that these four particularly heavily loaded by the molten metal 17 corners 39 are very resilient and protected.
• these four interchangeable, interchangeable surface elements 35, 36, 37 and 38 immediately embody first interchangeable edge and corner elements 40 facing the solidification space 22 (also numbered only by way of example), which have surfaces 30 modified relative to the surface region 31 of the wall part 25 ,
• edge or corner elements 40 are formed such that the four spaced apart, interchangeable surface elements 35, 36, 37 and 38 formulated further surface regions 32 with their short sides 41 at the long edges 42 of the wall portion 25 and with their long sides 43 are formed on the short edges 44 of the wall portion 25.
• the long edges 42 and thus also the short sides 41 are in this case arranged substantially horizontally, while the short edges 44 and thus also the long sides 43 are aligned substantially vertically.
• the four spaced, replaceable surface elements 35, 36, 37 and 38 extend with their respective longitudinal extent in the vertical direction, so that the long edges 42 of the wall portion 25 are largely reinforced.
• the alternative wall side 24A facing the solidification space 22 is cumulatively or alternatively entirely provided with a non-detachable permanent coating 51, the complete wall side 24A permanently having an increased roughness with respect to the smooth copper surface 28 by way of example.
• the alternative wall side 24A is coated over a large area with the correspondingly designed permanent magnet coating 51, so that the wall part 25 interacting with the molten metal 17 has a further modified surface structure 52.
• the wall part 25 interacting with the molten metal 17 has an alternative wall side 24A with a surface area 53 different in particular from the smooth copper surface 28 (see FIG.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Continuous Casting (AREA)

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Citations (10)

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• 2014
  • 2014-11-27 DE DE102014224236.3A patent/DE102014224236A1/de not_active Withdrawn
• 2015
  • 2015-10-20 WO PCT/EP2015/074212 patent/WO2016083023A1/de active Application Filing
  • 2015-10-20 CN CN201580064671.7A patent/CN107000042A/zh active Pending
  • 2015-10-20 EP EP15781686.9A patent/EP3223978B1/de active Active

Patent Citations (10)

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