EP2905093B1 - Système de lingotière pour la coulée en continu de produits métalliques - Google Patents

Système de lingotière pour la coulée en continu de produits métalliques Download PDF

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Publication number
EP2905093B1
EP2905093B1 EP14154370.2A EP14154370A EP2905093B1 EP 2905093 B1 EP2905093 B1 EP 2905093B1 EP 14154370 A EP14154370 A EP 14154370A EP 2905093 B1 EP2905093 B1 EP 2905093B1
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EP
European Patent Office
Prior art keywords
mould
mold
vibrations
devices
arrangement
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.)
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Application number
EP14154370.2A
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German (de)
English (en)
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EP2905093A1 (fr
Inventor
Christian Dratva
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 Concast AG
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SMS Concast AG
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Publication date
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Priority to EP14154370.2A priority Critical patent/EP2905093B1/fr
Priority to PCT/EP2015/052378 priority patent/WO2015118050A1/fr
Publication of EP2905093A1 publication Critical patent/EP2905093A1/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
    • B22D11/07—Lubricating the moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • 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
    • B22D11/053—Means for oscillating the moulds

Definitions

  • the invention relates to a Kokillenan angel for continuous casting of metallic products, with a mold and connected thereto means for generating vibrations.
  • the friction between the mold inner wall and the strand shell surface can not be reduced by the oscillation parameters, since in the dead centers always creates a static friction, which acts on the solidifying shell. Furthermore, the oscillation inevitably generates a pulsating tensile and compressive force on the newly formed strand shell. This primarily limits the maximum possible casting speed due to the strength of the resulting strand shell.
  • JP-A-57062842 is a vibration generation of a mold in the ultrasonic range disclosed by a plurality of laterally arranged on the mold vibrators.
  • vibrations generated in the ultrasonic range cause insufficient Kokillenoszillation, since such a vibration at a high number of oscillations generated too small amplitudes to keep the solidifying melt sufficiently separated from the inner shell of the mold.
  • EP-A-0 305 930 discloses a method for the oscillation of a continuous casting mold at high frequencies, in which oscillations with different frequencies are generated by a number of oscillators at right angles to the inner walls.
  • a connecting bolt of an oscillator extending through a plate is fastened to these inner walls.
  • These walls are further provided with grooves for water cooling, the outer plates serve to seal these grooves.
  • the oscillators operate with substantially electronically generated vibrations. With such electronically generated vibrations has the disadvantage that the amplitudes and frequencies can not be adjusted as desired and thus the friction between the mold and strand are not reducible.
  • the invention has for its object to avoid these disadvantages and to provide a mold of the type mentioned, which is characterized in that it effectively supports the transport of the strand with the simplest possible means or improves the quality of the strand surface.
  • actuators are preferably mounted in the upper region of the mold on the outside of the mold, which vibrations generate with a given amplitude and frequency range.
  • the mold according to the invention can also be provided with a conventional device for generating mechanical oscillations of the mold in the longitudinal direction of the mold.
  • a mold assembly 1 according to Fig. 1 with a mold 2 with a rectangular, square, polygonal or round cross-sectional profile is used for continuous casting of metallic products, such as long or flat products, especially steel products. It has a correspondingly shaped mold 2, a surrounding cooling box 20 for the water cooling and a preferably disc-shaped head part 3.
  • the mold assembly 1 are assigned a plurality of circumferentially distributed devices 5a to 5d for generating vibrations, such that during casting on the approximately entire inner wall 11 of the mold 2 in particular from the inlet to the outlet of the mold moving wave-shaped oscillations are generated.
  • four such devices 5a to 5d are arranged in the upper region of the mold 2.
  • These devices 5a to 5d are each advantageously equipped with piezoelectric actuators which generate vibrations directed in the mold 2 transversely to the longitudinal direction of the mold 2.
  • the devices 5a to 5d with the actuators are circumferentially distributed at the upper corners of the mold on the outside of the mold 2 attached.
  • the mold 2 is supported or held with advantage only on its upper side, while it is loose towards the bottom, so that the vibrations in the same can move down evenly.
  • the mold 2 is preferably held by the cooling box 20 surrounding it by a retaining ring 22 of the cooling box 20 which engages in a preferably outer annular groove at the upper end of the mold 2.
  • the respective device 5a fastened on the head part 3 comprises a cylindrical housing 51, a preferably piezoelectric bearing mounted therein Actuator 52 with a projecting plunger 55, a counterweight 53 connected to the actuator 52, a cover 54 which can be fastened to the housing on the front side, and a cable connection 56 for the actuator.
  • the actuator 52 is coupled, on the one hand, with the plunger 55 and the connecting bolt 55 'which is in contact with the outside of the mold 2, wherein this connecting bolt 55' is mounted axially displaceably in the cooling box 20.
  • the self-standing counterweight 53 is attached via a spacer screw 57 on the actuator 52 to accommodate thermal expansion.
  • the coupling of the spring-mounted actuator 52 to the likewise spring-mounted counterweight 53 causes the actuator 52 preferably exerts an on- or decongestant load on pressure on the mold 2 when activated, wherein it largely transfers the full impulse force to them with each shock pulse because the counterweight 53, with its mass inertia, absorbs the resulting reaction force almost immovably.
  • an approximately constant contact pressure of the actuator 52 and the plunger 55 is effected with the connecting pin 55 'to the Kokillenaussenseite.
  • the actuator 52 is internally connected through line connections 58 (see FIG Fig. 1 ) air or water cooled and can generate excitation oscillations of up to about 10000 Hz.
  • the plunger 55 could be coupled with the connecting bolt 55 'and the mold 2 mechanically free of play, so that in each case not only a pressure shock on the mold 2, but when moving back the plunger 55 with the connecting pin 55' and a pulling movement radially outward would affect them.
  • the vibrations generated by the actuators 52 are phase-matched so that the vibrations wander along the wavy shape from top to bottom.
  • the existing friction between the inner wall of the mold 2 and the strand moving thereon is reduced according to the invention by the vibrations, because they are the contact surface 11 between the mold 2 and the Strand shell 10 are effective.
  • the wave-like propagation of the vibrations in the direction of the withdrawal movement of the strand in turn generates a displacement force 14 on the shell wall of the strand, which supports the discharge of the strand during the casting process.
  • This effect is particularly strong when the mold 2, an inner wall 11 lubricating oil film 15 or slag is supplied. Due to the pyrolytic splitting of the oil film primarily in carbon C and hydrogen-rich gas H2 occurring in the meniscus of the resulting strand in the upper mold region, the latter flow through the joint between the inner wall of the mold and the strand shell in the direction of the arrow 13 from top to bottom, which is caused by the Vibrations is supported.
  • pockets 12 are formed on the inner wall by this undulating course, as shown in FIG Fig. 3 is clarified.
  • the gas is then absorbed, which forms a protective film and is taken down.
  • the adhesion of the solidifying steel is made impossible. If no lubricant is used, the air in the bag serves as a protective film.
  • the carbon C is known to have a lubricating effect, which also reduces the friction between the strand shell and the mold.
  • the hydrogen-rich gas H2 acts, as mentioned above, in turn like an air cushion and thus also helps to minimize the friction between the mold and strand.
  • the arrow 16 symbolizes the pyrolysis taking place there.
  • the inventive arrangement of the devices 5a to 5d in the upper region of the mold is optimal for a uniform distribution of the resonant vibrations or vibrations on all four side walls of the mold.
  • the actuators may be mounted in the upper mold part laterally and preferably centrally on the four side walls of the mold.
  • the frequency of the vibrations generated corresponds to the resonant vibrations of the mold 2 resulting from the intrinsic shape.
  • the necessary oscillation generation can be carried out with a low expenditure of energy.
  • the devices 5 a to 5 d can advantageously be arranged in the space surrounding the mold 2, which is supplied with a water circulation, so that they too are sufficiently lapped and thus cooled.
  • This space is formed by the mold and a surrounding mold, not shown.
  • the invention further provides that the power and / or the exciter frequency and / or the oscillation amplitude of the individual actuators are adapted to the size and rigidity of the mold.
  • a form-fit connection could also be provided between the mold outer side and the actuator, in which case a compressive and tensile load on the mold outer side would then be effected.
  • FIG. 4 and FIG. 5 each show the mold 2, which is offset by these devices, not shown 5a to 5d in the predetermined oscillations. These oscillations moving downwards along the longitudinal extent of the mold are disproportionately illustrated for better recognition.
  • a bulge 23 is formed by this generated oscillation field in the upper part of the mold 2, in which there is a cross-sectional enlargement both in the surface 23 'and in the corner regions 23 " , in which a cross-sectional constriction in the surface 24 'as well as in the corner regions 24 "is present.
  • there is a constriction at the inlet of the mold which moves downwards.
  • a large number of bulges 23 or constrictions 24 over the height of the mold are desired, wherein it is important that on the inner walls 11 of the mold 2 form these bulges 23 and constrictions.
  • FIG. 4 and FIG. 5 illustrate also that with these alternating bulges 23 or constrictions 24 due to this waveform a kind of swallowing motion, since with the downwardly bulging bulges 23 each increase the volume in the cavity of the mold 2 over a limited height. Thus, the liquid steel is moved as by swallowing down.
  • the devices could be distributed over the height of the mold to achieve on the inner wall of the mold at least from the upper to the lower region different waveforms in terms of wave velocity and / or wave amplitude.
  • the vibrations generated by these devices could also be timed to each other that these vibrations obliquely, for example helically, from the inlet to the outlet of the mold on the inner wall of the mold continuously and / or interrupted move. This would be particularly suitable for molds with round format. This could be achieved by arranging them around the mold Vibration generator short-term succession off and on again.
  • the mold according to the invention may be composed of mold tubes or of plates.
  • Additional passive actuators could also be arranged on the outside of the mold. These would then be provided with vibrations that would cause a targeted damping of the actual vibrations, so as to stabilize the mold and optionally to influence the wave-like vibration movements.
  • the devices can also be equipped with hydraulically or pneumatically acting vibration generators, in particular mass exciters, for example with mechanically acting percussion hammers which can be actuated electromagnetically or the like. With these hammer blows would be triggered only a blow in one direction.
  • An additional device could also be provided, by means of which the mold is mechanically oscillated back and forth in the longitudinal direction, as is known per se.

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

Claims (12)

  1. Système de lingotière pour la coulée continue de produits métalliques, comprenant une lingotière (2) et des actionneurs (52), de préférence piézo-électriques, reliés à celle-ci et ayant chacun un poussoir (55) en liaison avec la face extérieure de la lingotière (2) pour produire des oscillations de la lingotière (2), de manière à produire, pendant la coulée, des oscillations sur à peu près toute la paroi (11) intérieure de la lingotière (2), caractérisé en ce que
    à la lingotière (2) sont associés plusieurs dispositifs (5a à 5d), répartis sur le pourtour, de production des oscillations, de préférence d'oscillations de résonance, les dispositifs (5a à 5d) ayant chacun un boîtier (51) et l'actionneur (52), qui y est monté, les boîtiers (51) des dispositifs (5a à 5d) étant mis sur la face extérieure de la lingotière (2) sur une partie (3) de tête, de manière à ce que les poussoirs (55) attaquent, aux extrémités supérieures, la face extérieure de la lingotière.
  2. Système (1) de lingotière suivant la revendication 1, caractérisé en ce que
    des oscillations en forme d'ondes, se propageant de l'entrée à la sortie de la lingotière, de préférence des oscillations de résonance, peuvent être produites.
  3. Système (1) de lingotière suivant la revendication 1 ou 2, caractérisé en ce que
    la vitesse d'onde pouvant être produite par les dispositifs (5a à 5d), des oscillations, la puissance, l'amplitude d'onde et/ou la fréquence d'excitation sont adaptés à la dimension et à la rigidité de la lingotière (2).
  4. Système (1) de lingotière suivant l'une des revendications précédentes 1 à 3, caractérisé en ce que
    ces dispositifs (5a à 5d) de production d'oscillations sont mis sur la partie (3) de tête sur la face extérieure de la lingotière (2) et, ainsi, les oscillations produites sont dirigées transversalement à l'axe longitudinal de la lingotière.
  5. Système (1) de lingotière suivant l'une des revendications précédentes 1 à 4, caractérisé en ce qu'
    à la lingotière (2) est associé un dispositif d'apport d'huile ou de laitier, par lequel un film (15) d'huile, diminuant le frottement, peut être appliqué par la paroi (11) intérieure de la lingotière.
  6. Système (1) de lingotière suivant l'une des revendications précédentes 1 à 5, caractérisé en ce que
    les dispositifs (5a à 5d) ont chacun au moins un actionneur (5a à 5d) de production des oscillations.
  7. Système (1) de lingotière suivant la revendication 6, caractérisé en ce que
    les actionneurs (5a à 5d) ont chacun une puissance de P > 100 W et/ou une amplitude d'ondes de A ∼ 50 µm.
  8. Système (1) de lingotière suivant l'une des revendications précédentes 1 à 5, caractérisé en ce que
    les dispositifs (5a à 5d) sont équipés d'actionneurs piézo-électriques, de producteurs d'oscillations hydrauliques ou pneumatiques et/ou de marteaux de percussion mécaniques, qui peuvent être actionnés électromagnétiquement ou d'une manière analogue.
  9. Système (1) de lingotière suivant l'une des revendications précédentes 1 à 8, caractérisé en ce que
    les dispositifs (5a à 5d) sont disposés dans l'espace refroidi par de l'eau entourant la lingotière (2) afin d'être refroidis également d'une manière suffisante.
  10. Système (1) de lingotière suivant l'une des revendications précédentes 1 à 9, caractérisé en ce qu'
    il est prévu un dispositif supplémentaire, au moyen duquel la lingotière (2) peut osciller en aller et retour mécaniquement dans la direction longitudinale.
  11. Système (1) de lingotière suivant l'une des revendications précédentes 1 à 10, caractérisé en ce que
    la lingotière (2) est appuyée ou maintenue seulement sur son côté supérieur, tandis qu'elle est montée de manière lâche vers le bas.
  12. Système (1) de lingotière suivant l'une des revendications précédentes 1 à 11, caractérisé en ce que
    les dispositifs (5a à 5d), avec les actionneurs répartis sur le pourtour, sont mis aux coins supérieurs de la lingotière sur la face extérieure de la lingotière (2).
EP14154370.2A 2014-02-07 2014-02-07 Système de lingotière pour la coulée en continu de produits métalliques Active EP2905093B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14154370.2A EP2905093B1 (fr) 2014-02-07 2014-02-07 Système de lingotière pour la coulée en continu de produits métalliques
PCT/EP2015/052378 WO2015118050A1 (fr) 2014-02-07 2015-02-05 Agencement de lingotière pour la coulée continue de produits métalliques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14154370.2A EP2905093B1 (fr) 2014-02-07 2014-02-07 Système de lingotière pour la coulée en continu de produits métalliques

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Publication Number Publication Date
EP2905093A1 EP2905093A1 (fr) 2015-08-12
EP2905093B1 true EP2905093B1 (fr) 2018-08-29

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EP14154370.2A Active EP2905093B1 (fr) 2014-02-07 2014-02-07 Système de lingotière pour la coulée en continu de produits métalliques

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WO (1) WO2015118050A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105312515B (zh) * 2015-11-26 2018-12-18 中冶京诚工程技术有限公司 宽厚板用钢锭的铸造设备及其方法
CN110732477B (zh) * 2019-10-25 2021-07-23 哈尔滨工程大学 一种含传振杆的螺旋声波发射换能器
DE102020116143A1 (de) 2020-06-18 2021-12-23 Voestalpine Additive Manufacturing Center Gmbh Aktuator für eine gussform zur herstellung metallischer bauteile

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE589430A (fr) * 1960-04-05 1960-10-05 Centre Nat Rech Metall Procédé et dispositifs de coulée continue rapide
US3447480A (en) * 1967-07-24 1969-06-03 Bodine Albert G Method and apparatus for gravity flow casting utilizing sonic energization
SE452122B (sv) * 1980-04-04 1987-11-16 Nippon Steel Corp Forfarande for kontinuerlig gjutning av stalplatiner fria fran ytdefekter
JPS5762842A (en) * 1980-09-29 1982-04-16 Nippon Kokan Kk <Nkk> Ultrasonic vibration mold for continuous casting
DE3100137A1 (de) * 1981-01-05 1982-09-09 Nippon Steel Corp., Tokyo Stranggiessverfahren und stranggussform
GB2108878A (en) * 1981-11-06 1983-05-25 British Steel Corp Vibration of a continuous casting machine mould
DE3343479C1 (de) * 1983-12-01 1984-08-23 Fried. Krupp Gmbh, 4300 Essen Verfahren zum Oszillieren einer in sich starren Horizontal-Stranggiesskokille fuer Metalle,insbesondere Stahl
FR2570626B1 (fr) * 1984-09-26 1987-05-07 Siderurgie Fse Inst Rech Procede pour mettre en vibration une lingotiere de coulee continue afin de reduire le coefficient de frottement dans cette lingotiere et lingotiere pour la mise en oeuvre de ce procede
US4593743A (en) * 1985-05-09 1986-06-10 Continuous Casting Systems Inc. Continuous casting apparatus having oscillator for mold tube
DE3873451T2 (de) * 1987-08-29 1993-03-25 Nippon Steel Corp Stranggusskokille und verfahren zu ihrer hochfrequenz-oszillierung.
IT1288989B1 (it) * 1996-09-25 1998-09-25 Danieli Off Mecc Procedimento per l'ottenimento di vibrazioni delle pareti del cristallizzatore di una lingottiera mediante attuatori e
GB9804042D0 (en) * 1998-02-26 1998-04-22 Kvaerner Metals Cont Casting Improvements in and relating to mould oscillation
DE10155117A1 (de) * 2001-11-09 2003-05-22 Sms Demag Ag Stranggießkokille zum Vergießen von Metall, insbesondere in einen vergleichsweise dünnen Strang mit hoher Gießgeschwindigkeit
DE10244596B4 (de) * 2002-09-21 2011-12-29 Sms Siemag Aktiengesellschaft Vorrichtung zum Stranggießen von Metallen, insbesondere von Stahlwerkstoffen, zu Langprodukten in einer Mehrstrang-Gießanlage
LU91086B1 (en) * 2004-06-25 2005-12-27 Sms Demag Ag Continous casting mould wit oscillation device.
JP5206791B2 (ja) * 2008-06-30 2013-06-12 日本軽金属株式会社 鋳造用鋳型

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EP2905093A1 (fr) 2015-08-12
WO2015118050A1 (fr) 2015-08-13

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