EP3486001A1 - Installation de coulée de brames minces pourvue de tête de machine interchangeable - Google Patents

Installation de coulée de brames minces pourvue de tête de machine interchangeable Download PDF

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Publication number
EP3486001A1
EP3486001A1 EP18206026.9A EP18206026A EP3486001A1 EP 3486001 A1 EP3486001 A1 EP 3486001A1 EP 18206026 A EP18206026 A EP 18206026A EP 3486001 A1 EP3486001 A1 EP 3486001A1
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EP
European Patent Office
Prior art keywords
machine head
casting
continuous casting
mold
segment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18206026.9A
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German (de)
English (en)
Other versions
EP3486001B1 (fr
Inventor
Luc Neumann
Otmar Jannasch
Frank Seuffert
Jürgen Müller
Markus Reifferscheid
Ina HÜLLEN
Lothar Fischer
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SMS Group GmbH
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SMS Group GmbH
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Publication of EP3486001A1 publication Critical patent/EP3486001A1/fr
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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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0408—Moulds for casting thin slabs

Definitions

  • the invention relates to a machine head group for a continuous casting plant for the continuous casting of semi-finished products, preferably slabs or thin slabs for the production of flat steel products, also a continuous casting plant having such a machine head group, and a method for continuous casting of semi-finished products for the production of flat products.
  • liquid metal such as a molten steel
  • a ladle In continuous casting in the metallurgical region, liquid metal, such as a molten steel, from a ladle is usually fed through a distributor trough through a dip tube made of refractory material of a mold.
  • the mold defines the rectangular cross section of the later slab or thin slab from the molten steel.
  • the strand which has not yet solidified, emerges from the mold and is subsequently guided downwards by means of a strand guide, while it successively cools from outside to inside and solidifies. If the casting strand is deflected by the strand guide along an arc, directed and then further transported horizontally, the plant is called a "vertical turning plant".
  • the strand guide in particular in the bending area, is usually constructed of several construction-like segments.
  • the segments have paired and partially driven rollers for transporting and guiding the strand in a conveying direction. It is possible to reduce the slab or thin slab with liquid core in thickness, for example via "liquid core reduction".
  • the segments of the strand guide are preferably made adjustable. During transport through the strand guide, the strand becomes by means of a direct secondary cooling cooled by either water or a water / air mixture, whereby it solidifies from the outside inwards.
  • Continuous casting plants of the type described above are for example in the DE 10 2015 210 865 A1 and DE 10 2015 215 187 A1 described.
  • the mold Due to the high temperature and properties of the liquid steel in combination with the partially liquid casting powder, the mold is thermally, abrasive and chemically stressed. It is therefore a component that is subject to wear and must be regularly reworked or replaced. With the replacement of the mold in continuous casting, for example, the DE 27 29 457 A1 and WO 97/44150 A1 , This describes the WO 97/44150 A1 a solution for long products (billet or pre-block casters). Furthermore, the names WO 97/44150 A1 the production of different dimensions.
  • Thin slab plants are referred to as thin slab plants. On thin slab plants, different types of steel and the thinnest dimensions can be produced as a hot strip. Thin slab plants are provided with a funnel mold as a machine head. Such a hopper mold with dip tube is in the DE 197 10 791 C2 described. The funnel is provided when casting thin slabs, so that the dip tube, which supplies the liquid molten metal to the mold, finds enough space.
  • Peritectically solidifying and other crack-critical steel grades have the peculiarity that the strand shell, which has already solidified in the mold, experiences a volume jump (shrinkage of about 0.5%) due to a phase transformation (from delta ferrite to austenite). This creates tensile stresses that can lead to cracks and breakthroughs more frequently than with other steel grades. Peritectic or other crack-sensitive Steel grades are therefore difficult to cast on thin slab plants with hopper molds in a manner that is safe in terms of operation and quality. For this reason, two casting machines are required in the current state of the art to cover the entire steel grade range to the extent described above.
  • the machine head group according to the invention is set up for a continuous casting plant for the continuous casting of semi-finished products in the metallurgical area.
  • strand-shaped products are cast from a metal, in particular a metal alloy, preferably thin slabs or slabs made of steel.
  • the machine head group includes at least a first machine head and a second machine head. It should be noted that the terms “first” and “second” mean no order or order or provide the same, but only serve the linguistic distinction of the relevant components or features.
  • the first machine head is equipped with a hopper mold.
  • a funnel mold is in the field a mold with tapered walls, d. H. designated with a conical or frusto-conical shape, preferably of copper or a copper alloy, which may be coated.
  • the hopper mold is arranged to deploy the skein, preferably downwardly (viewed in the direction of gravity). For this purpose, the mold is fed to the melt to be cast and brought from the mold in the desired strand or slab form by the not yet solidified strand exits from a correspondingly shaped outlet opening of the mold.
  • the funnel is provided when casting thin slabs, so that the dip tube, which supplies the liquid molten metal to the mold, finds enough space.
  • a mold section with a rectangular casting cross-section can be located below the funnel, preferably in the region of the exit opening of the mold.
  • the first machine head preferably further includes a first machine head segment having a plurality of paired rollers, which may be partially driven, for transporting the rope-shaped product.
  • the first machine head segment viewed in the conveying direction of the strand-like product, adjoins the funnel mold.
  • the paired rollers of the first machine head segment each form a gap and a total of a gap, through which the strand-shaped product occurs in the conveying direction.
  • the hopper mold and the first machine head segment are preferably matched and / or combined in a manner such that the first machine head forms a module that is installable and replaceable as a unit in the continuous casting machine.
  • the second machine head has a mold, which is provided with a portion of constant casting cross-section along the conveying direction.
  • the mold preferably has plane-parallel walls, for example Copper, or a copper alloy, which may be coated on.
  • the mold of the second machine head is arranged to deploy the strand, preferably downwardly (viewed in the direction of gravity).
  • the mold is fed to the melt to be cast and brought from the mold in the desired strand or slab mold by the not yet solidified strand is discharged from the correspondingly shaped outlet opening of the mold.
  • This mold preferably has a rectangular cross-section in the casting direction over the entire length.
  • the second machine head preferably further comprises a second machine head segment having a plurality of paired rollers, which may be partially driven, for transporting the rope-shaped product.
  • the second machine head segment viewed in the conveying direction of the strand-like product, adjoins the mold.
  • the paired rollers of the second machine head segment also each form a gap and a total of a gap, through which the strand-shaped product occurs in the conveying direction.
  • the mold of the second machine head and the second machine head segment are preferably adapted to one another and / or combined in such a way that the second machine head forms a module that can be installed and exchanged as a structural unit in the continuous casting plant.
  • Both machine head groups are interchangeable with each other in order to be able to pour the entire range of quality and thickness reliably and safely.
  • the machine head group thus obtained enables an improvement in the surface quality and operational safety when casting difficult steels.
  • the machine head group allows the casting of both peritectically solidifying and non-peritectically solidifying grades of steel.
  • casting can be done with the second machine head. This is done by using mold plates without Funnel a lower tension training of the strand shell achieved so as to favor the formation of a flawless surface.
  • This special design of the machine head allows the use of a thin slab plant even for thicker slabs, without having to adjust the layout of the entire machine.
  • a continuous caster equipped with the machine head group set out permits a wide variety of steel grades and a large thickness range, which can save installation space and costs by eliminating the need to purchase and operate two continuous casters that would otherwise be required to meet the requirements Represent steel grade and thickness range.
  • the casting of the rope-shaped product by means of the second machine head is preferably due to casting thickness, with a lower casting speed than the casting of the rope-shaped product by means of the second machine head.
  • the surface quality and operational safety when casting peritectic or crack-critical steel grades can thus be further improved.
  • the mold of the second machine head has two opposite broad sides and two opposite narrow sides, which are each formed by plane-parallel plates, preferably made of copper or a copper alloy, which may be coated.
  • plane-parallel plates preferably made of copper or a copper alloy, which may be coated.
  • the rollers of the first machine head segment and / or the second machine head segment are arranged to be approximately adjustable such that during transport, a reduction in the thickness of the rope-shaped product takes place in the corresponding machine head segment.
  • the respective rolls are arranged or adjustable so that during the regular casting process the thickness of the strand emerging from the mold in the associated machine head segment is reduced. Work that way the mold and the associated machine head segment together in order to realize a greater thickness range with a continuous caster originally designed for thin slabs.
  • the system can be made more compact overall, since part of the reduction in thickness already takes place in the machine head segment and a possible rolling mill for reducing the thickness after solidification can thus be designed smaller.
  • the structure of the first machine head segment and the structure of the second machine head segment differ.
  • the paired rollers of the first machine head segment approximately form a first gap and form the paired rollers of the second machine head segment a second gap, preferably the width (ie, the intended dimension of the narrow side of the rope-shaped product) decreases at least the second gap in the conveying direction ;
  • the widths of both the first and the second splitting ducts decrease, the degree of decrease of the second splitting duct being smaller than that of the first splitting duct.
  • the casting of peritectically solidifying or generally crack-critical steel grades preferably takes place with the second machine head.
  • the degree of decrease of the second gap is preferably low, whereby the formation of a defect-free surface is favored.
  • an optimization of the roll diameters and / or roll spacings of rolls of the segments and / or machine head segments for the thickness range and / or casting speed range pourable by means of the first machine head and the second machine head takes place.
  • an optimal support of the strand is ensured both for the entire thickness range as well as for the large casting speed range and thus temperature range of the slab, whereby strand shell defects can be suppressed. It is pay special attention to the requirements that arise from the wide range of steel grades with different solidification and ductility characteristics, taking into account the strand dimensions.
  • the optimization thus differs from a conventional design directed either to one end of the illustrated range (high casting speeds and small thicknesses resulting in rapid through-solidification) or the other end of the illustrated range (large thicknesses and low casting speeds).
  • a design of the rolling schedule is realized such that the whole area is taken into consideration.
  • the first machine head is adapted to pour strand-shaped products having a casting thickness of up to 120 mm, more preferably in the range of 50 mm to 120 mm; and the second machine head is preferably arranged to cast strand-shaped products having a casting thickness of up to 200 mm, more preferably in the range of 120 mm to 170 mm.
  • the use of a mold type with a larger dimension is provided for the production of crack-critical steel grades because it does not have a hopper which can have an unfavorable effect when casting crack-critical steel grades.
  • the first machine head and the second machine head preferably have identical or construction-like components - such as housing, housing parts, fasteners, etc. - on, so that they interact in a modular manner with the continuous casting.
  • the machine head change can be carried out quickly in order to be able to integrate a machine head change into production planning without delay.
  • the continuous casting plant according to the invention is used for casting strand-like products, preferably steel slabs, and has a machine head group according to the above description.
  • the continuous casting plant is preferably a thin slab plant, i. H. a continuous casting plant that was originally designed for casting thicknesses up to 120 mm.
  • the use of the above-described machine head group thus allows a technically elegant retrofitting of a thin slab plant such that formats of up to 200 mm casting thickness and / or difficult steel grades can be realized due to the design-unnecessary funnel with the system.
  • the FIG. 1 schematically shows a continuous casting plant 1, which is designed and set up primarily as a thin slab plant.
  • the continuous casting plant 1 has at least two machine heads 2a, 2b (described in detail below) and a plurality of segments 3.
  • the segments 3 are identical or construction-like and together form a modular design strand guide.
  • the strand issued vertically down from an installed machine head 2a or 2b (see. Figures 2 and 3 ), passes into a bending region, formed by the segments 3, where it is subjected to bending forces on the one hand and to the other in the conveying direction F is transported. This is done by means of paired and partially driven rollers 31.
  • One or more segments 3 should be adjustable to image the large thickness range, whereby the thickness of the gap formed by the rollers 31 is defined. In particular, the thickness of the gap can decrease in the conveying direction, as exemplified for the upper segment 3 (ie, the first segment seen in the conveying direction F) in the FIGS. 1 to 3 is shown.
  • the adjustability can be realized hydraulically, electrically or in other ways become.
  • the relevant segment 3 may have one or more electrical connections and / or media connections 32, for instance hydraulic connections.
  • the strand is actively cooled by a secondary cooling, not shown, whereby it gradually solidifies from outside to inside.
  • the continuous casting plant is designed as a "vertical turning plant". It should be noted, however, that the strand guide can be accomplished in other ways, such as in the form of a vertical caster or a circular arc casting machine.
  • Each machine head 2a, 2b comprises, according to the present exemplary embodiment, a mold 21a, 21b and a machine head segment 22a, 22b.
  • the mold 21a is embodied as a funnel mold that forms a modular component or assembly with the machine head segment 22a as a first strand guide segment.
  • the funnel mold 21a and the machine head segment 22a are matched to one another so that the critical transition between the mold and the upper region of the strand guide does not have to be readjusted after a machine head change.
  • the mold 21b preferably embodied as a mold with plane-parallel broad side plates, forms, with the machine head segment 22b as a first segment for strand guidance, a modular component or structural unit.
  • the mold 21b is preferably a mold of copper plates (or plates of a copper alloy, which may be coated), with plane-parallel plates on the broad sides and also plane-parallel plates on the narrow sides, which are adapted to a relatively high casting thickness, for example, 150 mm.
  • the mold 21b and the machine head segment 22b are matched to one another, so that the critical transition between the mold and the upper region of the strand guide does not have to be readjusted after a machine head change. As a result, the replacement of the machine heads 22a and 22b can be done easily and quickly.
  • these can be made adjustable so that the gap formed by the rollers 23a and 23b can be adjusted.
  • the thickness of the gap can decrease in the conveying direction to compensate for the thermal shrinkage on the one hand and on the other hand to achieve an improvement in the internal quality, as exemplified and in different form for the two machine head segments 22a and 22b of FIGS. 1 to 3 is shown.
  • the adjustability can be realized hydraulically, electrically or in other ways.
  • the relevant machine head segment 22a, 22b may have one or more media connections 24a, 24b, for instance hydraulic connections.
  • the Kokillenö Maschinenssell the hopper mold 21a is about 100 to 120 mm, whereby a slab thickness of about 120 to 80 mm is feasible.
  • the mold 21b preferably has a Kokillenö Maschinenshack of about 150 mm.
  • the continuous casting machine 1 with installed machine head 2a which has the hopper mold 21a, is suitable for casting thin slabs of non-peritectically solidifying steel grades in a casting thickness range of 50 to 120 mm.
  • the machine head 2a can now according to the in the FIGS. 1 to 3 embodiment shown are replaced by the machine head 2b with plane-parallel plates on the broad sides and adapted to the new casting thickness narrow sides.
  • the associated machine head segments 22a and 22b are exchanged.
  • the change process shown in the Figures 2 and 3 , be shortened to about the time of a regular machine head change without attached segments.
  • the stated thin slab plant 1 with the two machine heads 2a and 2b enables an improvement of the surface quality and operational safety when casting crack-critical steel grades and / or casting thicknesses in the range of 150 mm.
  • the casting with the machine head 2b is preferably carried out at lower casting speeds than in thin slab casting with the machine head 2a.
  • a quick-change device for the last horizontal segments can be provided so that they can be changed quickly against "dummy" segments at the same time to meet changed solidification lengths.
  • the casting thickness is increased up to 150 mm to minimize stress in strand shell formation without the funnel-shaped mold 21b and to support the low casting speeds.
  • This compensation mechanism allows the use of the thin slab plant even for thicker slabs, without having to adjust the layout of the entire machine.
  • the continuous caster 1 allows a large variety of steel grades and a large G cumdicken Scheme, which space and cost can be saved by the purchase and operation of two continuous casters can be omitted, which would otherwise be necessary to represent the required steel grades and thickness range.
  • the changing operation of the machine heads 2a and 2b is in the Figures 5 and 6 shown. Since the machine heads 2a and 2b are formed by the respective molds 21a and 21b without being customized with them, it is particularly preferred that at least the first segment 3 of the strand guide (seen in the conveying direction F) can be adjusted, as a result of which the gap formed by the rollers 23a and 23b can be quickly and reliably applied to the current mold 21a , 21b can be adjusted. In the present example, even two segments 3 are provided adjustable. The adjustability can be realized hydraulically, electrically or in other ways. For this purpose, the relevant segment 3 can have one or more actuators with corresponding electrical connections and / or media connections 32, for example hydraulic connections.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP18206026.9A 2017-11-17 2018-11-13 Installation de coulée de brames minces pourvue de tête de machine interchangeable Active EP3486001B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017220616.0A DE102017220616A1 (de) 2017-11-17 2017-11-17 Dünnbrammengießanlage mit wechselbarem Maschinenkopf

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EP3486001A1 true EP3486001A1 (fr) 2019-05-22
EP3486001B1 EP3486001B1 (fr) 2020-04-01

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2729457A1 (de) 1976-07-08 1978-01-12 Voest Ag Stranggiessanlage
WO1988001209A1 (fr) * 1986-08-18 1988-02-25 Mannesmann Ag Procede et dispositif de coulee continue de brames
DE3909900A1 (de) * 1989-03-25 1990-10-18 Thyssen Stahl Ag Stranggiesskokille zum giessen von stahlband
WO1997004900A1 (fr) * 1995-08-02 1997-02-13 Mannesmann Ag Moule en fonte pour plaques permettant de produire des barres d'acier
WO1997044150A1 (fr) 1996-05-20 1997-11-27 Voest-Alpine Industrieanlagenbau Gmbh Machine a coulee continue
DE19710791C2 (de) 1997-03-17 2000-01-20 Schloemann Siemag Ag Zueinander optimierte Formen der Stranggießkokille und des Tauchausgusses zum Gießen von Brammen aus Stahl
DE102015210865A1 (de) 2015-05-06 2016-11-10 Sms Group Gmbh Gieß-Walz-Anlage und Verfahren zu deren Betrieb
DE102015215187A1 (de) 2015-08-10 2017-02-16 Sms Group Gmbh Schmelzmetallurgische Anlage, umfassend eine Kokille

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2729457A1 (de) 1976-07-08 1978-01-12 Voest Ag Stranggiessanlage
WO1988001209A1 (fr) * 1986-08-18 1988-02-25 Mannesmann Ag Procede et dispositif de coulee continue de brames
DE3909900A1 (de) * 1989-03-25 1990-10-18 Thyssen Stahl Ag Stranggiesskokille zum giessen von stahlband
WO1997004900A1 (fr) * 1995-08-02 1997-02-13 Mannesmann Ag Moule en fonte pour plaques permettant de produire des barres d'acier
WO1997044150A1 (fr) 1996-05-20 1997-11-27 Voest-Alpine Industrieanlagenbau Gmbh Machine a coulee continue
DE19710791C2 (de) 1997-03-17 2000-01-20 Schloemann Siemag Ag Zueinander optimierte Formen der Stranggießkokille und des Tauchausgusses zum Gießen von Brammen aus Stahl
DE102015210865A1 (de) 2015-05-06 2016-11-10 Sms Group Gmbh Gieß-Walz-Anlage und Verfahren zu deren Betrieb
DE102015215187A1 (de) 2015-08-10 2017-02-16 Sms Group Gmbh Schmelzmetallurgische Anlage, umfassend eine Kokille

Also Published As

Publication number Publication date
DE102017220616A1 (de) 2019-05-23
EP3486001B1 (fr) 2020-04-01

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