EP3395472A1 - Lingotière de coulée continue à refroidissement à écoulement optimisé - Google Patents

Lingotière de coulée continue à refroidissement à écoulement optimisé Download PDF

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Publication number
EP3395472A1
EP3395472A1 EP18167873.1A EP18167873A EP3395472A1 EP 3395472 A1 EP3395472 A1 EP 3395472A1 EP 18167873 A EP18167873 A EP 18167873A EP 3395472 A1 EP3395472 A1 EP 3395472A1
Authority
EP
European Patent Office
Prior art keywords
cooling channel
mold
coolant
cooling
flow
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.)
Withdrawn
Application number
EP18167873.1A
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German (de)
English (en)
Inventor
Oliver Wiens
Pawel Gabor
Mike Vetter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Group GmbH
Original Assignee
SMS Group GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SMS Group GmbH filed Critical SMS Group GmbH
Publication of EP3395472A1 publication Critical patent/EP3395472A1/fr
Withdrawn legal-status Critical Current

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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
    • B22D11/055—Cooling the moulds

Definitions

  • the invention relates to a mold for the continuous casting of molten metals, preferably steel, with one or more cooling channels.
  • a continuous casting mold is a funnel-shaped casting mold, which is usually made up of water-cooled copper plates.
  • the mold has a tapering in the casting direction square or rectangular cross-section.
  • the hot melt is introduced through a Tauchg tellrohr into the mold cavity of the mold to the so-called bath level and transported through the conically tapered mold, whereby slabs are cast in a continuous casting process.
  • the conical adjustment of the mold walls is necessary because the liquid steel in the mold strongly cools and contracts. The mold walls guide and cool the strand to achieve a defined casting result, free of cracks and defects.
  • the mold walls In order to dissipate the heat of the steel to be cast, the mold walls have cooling channels through which a coolant, such as water, flows. That's how it describes WO 03/092931 A1 a mold for the continuous casting of molten metals, which is equipped with cooling channels in the facing away from the contact surface with the melt mold side.
  • the cooling channel walls can be designed, for example, as smooth tubes with at most production-related roughness. Also known are so-called U-slots with patches, especially in the field of thin slab molds, holes and simpledekanalgeometrien.
  • An object of the invention is to provide a mold for continuous casting of molten metals, preferably steel, and a method for cooling such mold, which allow higher productivity and / or product quality.
  • the mold according to the invention is used for the continuous casting of molten metals, preferably steel. It has one or more mold walls, preferably made of copper or a copper alloy, which can be arranged funnel-shaped, optionally adjustable.
  • the mold has at least one cooling passage which extends along an axial direction and is arranged to be flowed through by a coolant in the axial direction.
  • the term "axial direction" is used to define a normal flow direction of the coolant, so it does not exclude a curved, curved, crossed course and other geometric shapes of the cooling channel.
  • the cooling channel particularly preferably has a cylindrical shape, formed from one or more cooling channel inner walls, so that the axial direction coincides with the direction of extension of the cooling channel, which - as stated - does not have to be rectilinear, but can follow another, even complicated trajectory, as long the normal flow direction is defined along the cooling channel.
  • the cooling channel can be introduced into the mold wall, for example by drilling, cutting, etching or other techniques.
  • the coolant is preferably a liquid, more preferably water or a mixture having water as a main component.
  • the cooling channel has a swirl-generating means, which conveys a defined radial component to the coolant flow.
  • a "defined” radial component is to be understood that this is at least partially uniform, so that the radial rotational movement of the coolant - in contrast to the intermixing, non-directional turbulence from the prior art - is ordered.
  • Swirl-generating means is responsible for causing the coolant to rotate, with an axis serving as an axis of rotation along the axial direction as defined above, such as the centerline of the cooling passage, if definable.
  • the resulting, well-defined direction of movement of the coolant is thus composed of the normal flow direction along the direction of extension of the cooling channel and a superimposed rotational movement with radial component.
  • a boiling crisis occurs when the formation of vapor causes the liquid film on the cooling channel wall to break off and the heat can thus no longer be dissipated properly.
  • bubble separation by increasing the flow velocity - side effects take place, such as a temperature-related gas excretion.
  • the vapor bubbles form on germ cells on the cooling channel wall, dissolve and are in turn displaced by the coolant.
  • the optimized heat transport improves the safety and reliability of the casting process.
  • the lifetime of the mold, in particular that of the copper plates, if used, is increased because temperature-dependent recrystallization processes are reduced or no longer occur, especially with copper materials. This allows the casting performance improve as well as increase the casting speed.
  • the amount of water for cooling can be reduced by the optimized cooling performance. This in turn leads to energy savings through a lower pump performance.
  • the cooling channel is cylindrical and has a circular cross-section perpendicular to the extension direction. This makes it particularly easy to set the coolant in rotation, and the rotation can be maintained undisturbed over long distances. This leads to a further optimization of the flow behavior. Deviations, in particular slight deviations from a circular cross section, are however possible.
  • the cooling channel may have an oval, elliptical or polygonal cross section, provided that the flow behavior described above can be generated.
  • the swirl generating means comprises one or more grooves and / or ribs, which are particularly preferably provided spirally on the cooling channel inner wall.
  • the number, pitch, and extent, as well as the spacing, flank geometry, and other geometric parameters of the grooves or ribs, can be optimized for the intended swirling, flow (especially flow rate), and heat demand of the system.
  • the swirl flow of the coolant is achieved by spiral grooves and / or ribs.
  • the swirl flow of the coolant is achieved by spiral grooves and / or ribs.
  • the swirl flow of the coolant is achieved by spiral grooves and / or ribs.
  • the swirl generating means include a swirl or wire, preferably substantially the entire length of the bore or slot. Further, the swirl can be generated or the swirling can be promoted by the coolant is supplied tangentially.
  • the cooling channel with swirl-generating means is preferably provided at the height of the bath level.
  • the above object is further achieved by a method which is provided for cooling a mold for the continuous casting of molten metals, preferably steel.
  • the mold is constructed as described above.
  • the coolant is provided and / or circulated so as to flow through the cooling passage in the axial direction.
  • a defined radial component of the coolant flow is generated, whereby the coolant is set in rotation, wherein an axis along the above-defined axial direction acts as a rotation axis.
  • a separation of the liquid phase and gas phase of the coolant takes place, wherein gas bubbles, which tend to arise at the edge of the cooling channel or on a cooling channel inner wall, are transported into the interior of the cooling channel.
  • the described mold is used for the continuous casting of molten metals, preferably steel. Particularly preferably, the mold on walls of one or more copper plates, which are particularly suitable as a heat exchanger.
  • the invention is suitable for cooling thin-slab molds with displacers or deep-hole bores for shaping the one or more cooling channels.
  • FIG. 1 schematically shows a continuous casting with mold in longitudinal section with subordinate support guide.
  • FIG. 2 shows schematically the inner wall structure of a cooling channel, wherein the figure detail a) is a cutaway three-dimensional view and the figure detail b) shows a longitudinal section through the cooling channel.
  • the FIG. 1 schematically shows a continuous casting with a mold 1. Below the mold 1, a guide grid 2, a plurality of support guide rollers 3 and a pair of drive rollers 4 are arranged. For diverting the cast strand 5 in the horizontal, a bending roller 6 and a guide roller 7 are provided. To straighten the strand 5 after the detour is a straightening 8. The Cast strand 5 can be cooled below the mold by spraying water.
  • the mold space 9 of the mold 1 is exemplified here by a flat mold wall 10 'of a first broad side wall 10 and a curved mold wall of a second broad side wall 11, and two narrow side walls arranged therebetween (in the FIG. 1 not shown).
  • the planar first broad side wall 10 and the flat lateral and lower surfaces of the curved second broad side wall 11 are inclined at an angle ⁇ to the vertical.
  • a mold frame 13 is slidably provided on an oscillation guide 14.
  • the exemplary oscillation direction corresponding to the inclination angle ⁇ of the flat broad side wall 10 is illustrated by a double arrow 15.
  • the guide grid 2 and the support guide rollers 3 form an inclined ⁇ at an angle to the vertical, ie the strand exit direction corresponding guide track.
  • the molten steel is introduced through a submersible pouring tube 16 into the forming space 9 of the mold 1 to the bath level 17.
  • the immersion casting tube 16 is preferably flattened to ensure sufficient free space to the mold walls.
  • lateral outflow openings 18 are located below the bath level 17.
  • cooling channels 30 through which a coolant flows.
  • the coolant is preferably water or a mixture whose main component is water.
  • the cooling channels 30 preferably run parallel to the inner surfaces of the broad side walls 10, 11 and narrow side walls. Due to the rapid cooling of the molten steel, this solidifies on the mold walls to form a strand shell 20.
  • FIG. 2 schematically shows the inner wall structure of an exemplary cooling channel 30.
  • the figure detail a) is a cutaway three-dimensional view
  • Figure detail b) shows a longitudinal section through the cooling channel 30.
  • the cooling channel 30 is cylindrical, it has an at least approximately circular cross-section perpendicular to the center line M, which extends in the longitudinal direction of the cooling channel 30.
  • a cylindrical shape in particular a circular cross-section, is preferred because it is beneficial to the swirl effect described below, but other cross sections - such as an oval, elliptical or polygonal - in question, if funds are available and the geometry is suitable, to achieve a swirl-like, rotating flow of the coolant.
  • the inner wall of the cooling channel 30 has one or more grooves, i. Recesses 31 which are like a thread spirally stamped or cut or otherwise introduced.
  • a manufacturing possibility of the grooves 31 is to cut with a special tool a spiral shape in the inner wall of the cooling channel 30.
  • the cylindrical tool leaves on the cooling channel wall grooves 31 or grooves, which can run in a spiral parallel or crossing.
  • the described geometry of the cooling channel 30 now causes the normal axial flow along the axis M is superimposed by a swirl flow having a defined radial component.
  • the grooves 31 thus do not produce undirected, mixing turbulence of the coolant, but the coolant experiences a well-defined flow behavior resulting from a normal flow along the longitudinal direction of the cooling channel 30 and a superimposed swirl flow, ie swirl-like Flow with radial Component composed.
  • vapor bubbles which tend to form on the cooling channel wall as a result of the evaporation of the liquid, are transported into the interior of the cooling channel 30.
  • the liquid component collects at the edge of the cooling channel, while the gas component is transported inwards.
  • the number, slope, and extent, as well as the distance, flank geometry, and other geometric parameters of the grooves 31 can be optimized for the intended swirl formation, flow (in particular, flow rate), and heat demand of the system.
  • the swirl creates a suction which promotes the separation of the two-phase flow and forces the gas phase into the center of the cooling channel 30 in the manner discussed.
  • an optimal heat transfer between the cooling channel wall and the coolant is created.
  • the boundary layer near flow velocity increases at the cooling channel wall, whereby the steam film extrusion delayed and the bubble separation is favored by the wall.
  • the wall-side liquid phase of the coolant with the reference numeral 32 and the inwardly sloping gas phase with the reference numeral 33 are designated.
  • the coolant F flows in the figure cutout 2b) from below into the cooling channel 30 and is rotated by the grooves 31 in rotation.
  • the wetted with the liquid phase 32 surface is enlarged and favors optimal heat transfer to the cooling channel wall.
  • the so-called boiling crisis can be avoided or at least delayed.
  • a boiling crisis occurs when the formation of vapor causes the liquid film on the cooling channel wall to break off and the heat can thus no longer be dissipated properly.
  • the swirl flow of the coolant is achieved by spiral grooves 31.
  • the cooling channel 30 preferably at the entrance of the cooling channel 30, one or more wings, which are similar to turbine blades.
  • Other means are a swirl or wire, preferably substantially the entire length of the drill or slot.
  • the swirl can be generated or the swirling can be promoted by the coolant is supplied tangentially.
  • a flow-optimized embossing of the filler is technically feasible.
  • the coolant flows through the cooling channel 30 at a speed relative to the cooling channel wall of more than 7 m / s in order to effectively prevent the vapor film formation. Since the transition from the single-phase refrigerant flow to the two-phase liquid-gas flow is precisely in the high-temperature-loaded meniscus region, i. Given in the region of the bath level 17, cooling channels are preferably provided in this area with means for swirling.
  • the safety and reliability of the casting process can be improved.
  • the lifetime of the mold, in particular that of the copper plates, if used as mold walls, is increased because temperature-dependent recrystallization processes are reduced or no longer occur, especially with copper materials. This can be done improve the casting performance and increase the casting speed. Furthermore, the amount of water for cooling can be reduced by the optimized cooling performance. This in turn leads to energy savings through a lower pump performance.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP18167873.1A 2017-04-25 2018-04-18 Lingotière de coulée continue à refroidissement à écoulement optimisé Withdrawn EP3395472A1 (fr)

Applications Claiming Priority (1)

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DE102017206914.7A DE102017206914A1 (de) 2017-04-25 2017-04-25 Stranggießkokille mit strömungsoptimierter Kühlung

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EP3395472A1 true EP3395472A1 (fr) 2018-10-31

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EP18167873.1A Withdrawn EP3395472A1 (fr) 2017-04-25 2018-04-18 Lingotière de coulée continue à refroidissement à écoulement optimisé

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DE (1) DE102017206914A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113798452A (zh) * 2021-10-19 2021-12-17 重庆大学 一种高效利用冷却水的方坯连铸结晶器铜管及方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59141347A (ja) * 1983-02-01 1984-08-14 Kuroki Kogyosho:Kk 連続鋳造用鋳型
JPH09141395A (ja) * 1995-11-21 1997-06-03 Kawasaki Steel Corp 連続鋳造鋳型の冷却方法及び鋳型構造
DE102007002405A1 (de) * 2007-01-17 2008-07-24 Sms Demag Ag Stranggießkokille mit Kühlmittelkanal
WO2016135690A1 (fr) * 2015-02-27 2016-09-01 Milorad Pavlicevic Moule pour coulée continue

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1267246B1 (it) 1994-06-06 1997-01-28 Danieli Off Mecc Sottolingottiera a pareti per colata continua
TWI268821B (en) 2002-04-27 2006-12-21 Sms Demag Ag Adjustment of heat transfer in continuous casting molds in particular in the region of the meniscus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59141347A (ja) * 1983-02-01 1984-08-14 Kuroki Kogyosho:Kk 連続鋳造用鋳型
JPH09141395A (ja) * 1995-11-21 1997-06-03 Kawasaki Steel Corp 連続鋳造鋳型の冷却方法及び鋳型構造
DE102007002405A1 (de) * 2007-01-17 2008-07-24 Sms Demag Ag Stranggießkokille mit Kühlmittelkanal
WO2016135690A1 (fr) * 2015-02-27 2016-09-01 Milorad Pavlicevic Moule pour coulée continue

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113798452A (zh) * 2021-10-19 2021-12-17 重庆大学 一种高效利用冷却水的方坯连铸结晶器铜管及方法

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