EP0403411B1 - Procédé et dispositif de mise en vibration d'une lingotière de coulée continue des métaux - Google Patents

Procédé et dispositif de mise en vibration d'une lingotière de coulée continue des métaux Download PDF

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Publication number
EP0403411B1
EP0403411B1 EP90470033A EP90470033A EP0403411B1 EP 0403411 B1 EP0403411 B1 EP 0403411B1 EP 90470033 A EP90470033 A EP 90470033A EP 90470033 A EP90470033 A EP 90470033A EP 0403411 B1 EP0403411 B1 EP 0403411B1
Authority
EP
European Patent Office
Prior art keywords
mold
mould
continuous casting
vibrations
axis
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.)
Expired - Lifetime
Application number
EP90470033A
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German (de)
English (en)
French (fr)
Other versions
EP0403411A1 (fr
Inventor
Michel Nogues
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.)
Unimetal SA
Sollac SA
Original Assignee
Unimetal SA
Sollac SA
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 Unimetal SA, Sollac SA filed Critical Unimetal SA
Publication of EP0403411A1 publication Critical patent/EP0403411A1/fr
Application granted granted Critical
Publication of EP0403411B1 publication Critical patent/EP0403411B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • 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
    • B22D11/0401—Moulds provided with a feed head
    • 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
    • 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

Definitions

  • the present invention relates to a method of vibrating a mold for continuous casting of metals, of the type comprising transmitters transmitting ultrasonic vibrations to the wall of the mold according to the preamble of claim 1 and a device according to the preamble of claim 2.
  • the surface quality of a metal product, in particular steel, continuously cast depends very largely on the way in which the first skin of this product solidifies from the free surface of the liquid metal in the mold (generally called meniscus).
  • meniscus the free surface of the liquid metal in the mold
  • one of the problems encountered in the continuous casting of metals, in particular steel, whether it is of the "free jet” or “submerged nozzle” type, is that of attachment or bonding. on the internal face of the ingot mold, of the solidified crust resulting from the peripheral freezing of the metal bar cast in contact with the energetically cooled wall of the ingot mold. Due to this attachment, it may occur, during the progression of the bar in the mold, tears in the solidified crust, which are the source of breakthroughs.
  • One of the techniques known to date for improving this surface quality and avoiding these breakthroughs consists in reducing the coefficient of friction between the solidified crust and the internal face of the wall of the mold, by transmitting to this wall, in particular in the meniscus region, ultrasonic vibrations.
  • this wall in particular in the meniscus region
  • piezoelectric ultrasonic transmitters are used.
  • These ultrasonic vibrations can be transmitted by means of one or more transmitters applied against the external faces of the side walls of the mold.
  • the vibrations follow a direction substantially perpendicular to the pouring axis and the transverse pressure wave which propagates in the wall of the ingot mold deforms it by bending in this same direction.
  • This is for example the case in the document FR 2 497 130 and in the document JP-A-62 127 143, on which the preambles of claims 1 and 2 are based.
  • This or these transmitters can also be applied against the upper edge or the lower edge of the mold.
  • the excitation of the ingot mold in a purely transverse direction with respect to its axis encounters certain difficulties.
  • the ultrasonic emitters must be installed as close as possible to the internal surface of the ingot mold so that a sufficient part of the vibratory energy that they produce is effectively transmitted to the level of the surface in contact with the cast product.
  • the transmitters must pass through the jacketed part used for cooling the ingot mold, the construction of which is thus made more complex. It is even common to have to locally reduce the thickness of the wall of the mold in the area where the transmitter is located, as is the case in the document FR 2497130 already cited. On the other hand, it is thus much less easy to equip the mold with an electromagnetic stirrer for stirring the liquid metal.
  • the vibration of the ingot mold according to a mode of propagation of the waves in the longitudinal direction makes it possible to overcome this high sensitivity to variations meniscus level and improve thus the reproducibility of the metallurgical results of the process.
  • a ingot mold of classic design is quite suitable for this use.
  • the transmitters can be easily adapted to an existing ingot mold without the need to modify it profoundly. But if they are placed vertically on the upper edge of the mold, they fill part of the space which is normally free between the mold and the lower part of the distributor which supplies it with liquid metal. This can hinder access to the meniscus, in particular for optical level regulation devices, for its supply of covering powder and for its observation by operators.
  • the transmitters are thus exposed to metal projections coming from the meniscus. If they are placed on the lower edge of the mold, the above problems no longer arise. However, in return, the emitters are exposed to the radiation of the product leaving the ingot mold. In addition, in the event of tearing of the solidified skin at the outlet of the ingot mold resulting in a flow of liquid metal, the latter has every chance of damaging the emitters.
  • the invention proposes to reconcile these two modes of excitation of the ingot mold so as to increase the efficiency of its vibration, while benefiting from advantages which are not found in any of the two known modes.
  • the subject of the invention is a process for the continuous casting of metals, in particular steel, of the type according to which ultrasonic vibrations are applied to the wall of the mold, characterized in that said vibrations comprise both a component oriented parallel and a component oriented perpendicular to the axis of the mold.
  • the invention also relates to a device for vibrating a mold for the continuous casting of metals of the type comprising at least one ultrasonic emitter capable of emitting in a determined direction and placed at one of the ends of the mold, characterized in that it comprises at least one surface integral with the mold and the normal of which forms an angle ⁇ , not zero and not straight with the axis of the mold, and against which said transmitter is applied whose direction emission of ultrasound is perpendicular to said surface.
  • this surface is constituted by a bevelled edge of a crown traversing the perimeter of one end of the mold.
  • This crown can be attached to the mold, or be incorporated into the mold during manufacture.
  • the invention consists in orienting the ultrasonic vibrations communicated to the ingot mold obliquely so that they propagate both in the longitudinal direction of the ingot mold and in its transverse direction.
  • the vibrations of the ingot mold therefore themselves have a longitudinal component and a transverse component, in contrast to the vibrations imparted by means of conventional devices, which have noticeably only one or the other of these two components.
  • the ultrasonic emitters By placing the ultrasonic emitters obliquely to the casting axis, the vertical size of the device for vibrating the ingot molds is reduced. If they are located on the upper edge of the mold, the disadvantages of this location are minimized. On the other hand, by transmitting these oblique vibrations to the ingot mold, a movement is imparted to it which is a compromise between that provided by purely transverse vibrations and purely longitudinal vibrations.
  • the inventors have found that, by choosing the angle of inclination of the emitters relative to the casting axis, it was possible to achieve a better distribution of the vibrational energy in the mold than in the case where this angle was zero, while retaining a good transmission efficiency of the transmitters vibrations to the mold. In most cases, the value optimum of this angle of inclination, open towards the upstream part of the continuous casting machine, is approximately 60 or 120 °.
  • the ingot mold 1 has an internal wall 2 made of a material which is a good conductor of heat, such as copper or a copper alloy, surrounded by a jacket 3 ensuring vigorous cooling of the wall 2 by circulation of a coolant, such as water.
  • the mold can be of any section, square, rectangular or round. It is supplied with liquid metal 5 by a nozzle 4 made of refractory material connected to a distributor 14.
  • the liquid metal 5 begins to solidify against the wall 2 and to form a solid crust 6 whose thickness increases as and when the product 7 is extracted from the mold in the direction indicated by the arrow 8.
  • the purpose of the vibration of the mold is to improve the surface condition of the product and to prevent this solid crust 6 from adhering to wall 2 and won't tear.
  • the mold is provided at one of its ends with a crown 9.
  • a crown 9 In the configuration shown, it is the upper end of the mold which is equipped with it.
  • This crown runs around the perimeter of the mold, which it is made integral with fixing means as symbolized by screws 10,10 '.
  • the contact between the crown and the mold must be ensured in such a way that vibrations communicated to the crown are transmitted to the mold with such high efficiency. as possible.
  • the upper edge of the crown 9 is bevelled, so that the crown has a surface 11 against which one or, preferably, several emitters 12, 12 ′ of ultrasound are applied.
  • the surface 11 is oriented so that the axis of the transmitters 12,12 ', perpendicular to the surface, is inclined relative to the axis of the mold at an acute angle ⁇ open towards the upstream part of the machine continuous casting.
  • the transmitters communicate to the crown and, consequently, to the entire mold, vibrations oriented along their axis, and therefore having both a horizontal and a vertical component.
  • Part of the vibrational energy is thus used to vibrate the wall of the mold in a direction perpendicular to the axis of casting.
  • the rest of the vibrational energy causes the mold to vibrate in a direction parallel to the casting axis.
  • the device described makes it possible to reduce the vertical size of the apparatus. It also removes emitters from the meniscus and thus reduces their exposure to liquid metal splashes from the meniscus. To improve this protection and to house the emitters of the radiation from the nozzle 4, it is also possible to install a cover which would not hinder accessibility too much inside the mold.
  • the crown 9 is not attached to the mold, but is an integral part thereof. On the other hand, it is not the upper edge of the crown 9 which is bevelled, but its lower edge. There is thus formed on the crown a turned surface 13 down from the continuous casting machine.
  • the ultrasonic emitters (12,12 ') are applied to the face 13.
  • the angle ⁇ open towards the upstream of the machine, is therefore this time an obtuse angle.
  • This configuration is particularly advantageous because thus, the vertical size of the vibrating device is limited to the excess thickness introduced by the crown 9.
  • the ultrasonic emitters are even better sheltered from projections of liquid metal than in the configuration previous, and are no longer exposed to radiation from the nozzle 4.
  • the vibrations emitted by the transmitters are preferably power ultrasound, with a frequency greater than or equal to 16 kHz to avoid excessive noise pollution.
  • Ultrasonic transmitters are of any type known per se, such as piezoelectric transducers, which are to be recommended because of their ability to provide long-lasting high power levels.
  • the number of ultrasonic emitters must be chosen so as to ensure good symmetry of the vibration of the ingot mold, to guarantee a reduction of the friction forces sufficiently uniform over all the portions of the ingot mold.
  • the presence of at least one transmitter per face is recommended.
  • each large face can be equipped with several transmitters, in the case where the vibrations emitted by a single transmitter placed in the middle of the large face undergo too great damping before reaching the lateral ends of the big face.
  • two transmitters placed in diametrically opposite positions may be sufficient, if the diameter of the ingot mold is not too large.
  • the invention is not limited to the examples which have just been described and shown. It is applicable to conventional continuous casting ingot molds of all types, straight or curved, vertical or horizontal, for the production of products of all formats: billets, blooms, slabs, or even for the direct casting of thin products.
  • a variant of this device would consist in not using a continuous crown, but a plurality of bevelled pieces, each of which would carry at least one oriented transmitter as has just been described.
  • fluttering phenomena are likely to be established, which could be detrimental to a proper installation.
  • the particular orientation of the ultrasonic vibrations can be obtained by any independent means of the ingot mold and integrated into the ultrasonic transmitters. These would therefore communicate the mold an excitation oriented obliquely to the axis of the transmitters. The parts of the mold supporting the transmitters would not necessarily be oriented obliquely with respect to the axis of the mold.
  • This method and this device can be used alone or in conjunction with other means of reducing the risks of sticking of the solidified skin to the walls of the mold, such as low frequency mechanical oscillations and lubrication of the walls with oil. or a meniscus covering slag.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
EP90470033A 1989-06-12 1990-06-07 Procédé et dispositif de mise en vibration d'une lingotière de coulée continue des métaux Expired - Lifetime EP0403411B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8907839 1989-06-12
FR8907839A FR2648063B1 (fr) 1989-06-12 1989-06-12 Procede et dispositif de mise en vibration d'une lingotiere de coulee continue des metaux

Publications (2)

Publication Number Publication Date
EP0403411A1 EP0403411A1 (fr) 1990-12-19
EP0403411B1 true EP0403411B1 (fr) 1993-09-29

Family

ID=9382689

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90470033A Expired - Lifetime EP0403411B1 (fr) 1989-06-12 1990-06-07 Procédé et dispositif de mise en vibration d'une lingotière de coulée continue des métaux

Country Status (11)

Country Link
US (1) US5355935A (da)
EP (1) EP0403411B1 (da)
JP (1) JPH0741374B2 (da)
KR (1) KR970005364B1 (da)
AT (1) ATE95092T1 (da)
BR (1) BR9002745A (da)
CA (1) CA2018684C (da)
DE (1) DE69003600T2 (da)
DK (1) DK0403411T3 (da)
ES (1) ES2044517T3 (da)
FR (1) FR2648063B1 (da)

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MY111637A (en) * 1992-11-30 2000-10-31 Bhp Steel Jla Pty Ltd Metal strip casting
DE4410511A1 (de) * 1994-03-28 1995-10-05 Didier Werke Ag Verfahren und Vorrichtung zum endabmessungsnahen Vergießen von Schmelzen
AUPM589894A0 (en) * 1994-05-27 1994-06-23 Bhp Steel (Jla) Pty Limited Metal strip casting
US5799722A (en) * 1995-03-02 1998-09-01 Buziashvili; Boris Method and apparatus for continuous metal casting
FR2747062B1 (fr) * 1996-04-05 1998-04-30 Ugine Savoie Sa Lingotiere de coulee continue pour la coulee continue en charge verticale des metaux
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
DE19823361A1 (de) * 1998-05-15 1999-11-25 Mannesmann Ag Verfahren und Vorrichtung zum Abziehen eines Metallstranges
FR2783731B1 (fr) * 1998-09-24 2000-11-10 Ascometal Sa Lingotiere tubulaire de coulee continue en charge des metaux
US20040177942A1 (en) * 2001-01-12 2004-09-16 Mason Douglas P. Method and apparatus for vibration casting of vehicle wheels
DE10119355A1 (de) * 2001-04-20 2002-10-24 Sms Demag Ag Verfahren und Vorrichtung zum Stranggießen von Brammen, insbesondere von Dünnbrammen
US6523601B1 (en) 2001-08-31 2003-02-25 Shlomo Hury Method and apparatus for improving internal quality of continuously cast steel sections
US8545645B2 (en) * 2003-12-02 2013-10-01 Franklin Leroy Stebbing Stress free steel and rapid production of same
US7698797B2 (en) * 2005-02-02 2010-04-20 Ford Global Technologies Apparatus and method for forming a joint between adjacent members
KR101449018B1 (ko) * 2007-12-27 2014-10-08 주식회사 포스코 응고조직의 제어를 위한 초음파 발생장치
EP2452763A1 (en) 2008-03-05 2012-05-16 Southwire Company Graphite die with protective niobium layer and associated die-casting method
JP5641761B2 (ja) * 2010-04-01 2014-12-17 新日鐵住金株式会社 連続鋳造装置
US8652397B2 (en) 2010-04-09 2014-02-18 Southwire Company Ultrasonic device with integrated gas delivery system
PT2556176T (pt) 2010-04-09 2020-05-12 Southwire Co Dispositivo ultrassónico com sistema integrado de entrega de gás
DE102011083016A1 (de) 2011-09-20 2013-03-21 Sms Siemag Ag Vorrichtung zum Stranggießen und Verwendung von piezoelektrischen Aktuatoren
EP3071718B1 (en) 2013-11-18 2019-06-05 Southwire Company, LLC Ultrasonic probes with gas outlets for degassing of molten metals
PL3256275T3 (pl) 2015-02-09 2020-10-05 Hans Tech, Llc Ultradźwiękowa rafinacja ziarna
US10233515B1 (en) 2015-08-14 2019-03-19 Southwire Company, Llc Metal treatment station for use with ultrasonic degassing system
CN114871418A (zh) 2015-09-10 2022-08-09 南线有限责任公司 用于金属铸造的超声晶粒细化和脱气程序及系统
BR112019002668B1 (pt) 2016-08-10 2022-07-26 Nucor Corporation Aparelho e método para fundição contínua de tira de metal; retentor de represa lateral e montagem de represa lateral para fundição contínua de tira de metal
CN110461501B (zh) * 2017-03-08 2022-04-26 南线有限责任公司 具有直接振动耦合的晶粒细化
KR102038648B1 (ko) * 2018-06-18 2019-11-26 주식회사 포스코 주조장치
BR112021001244A2 (pt) * 2018-07-25 2021-04-27 Southwire Company, Llc aprimoramento ultrassônico de materiais fundidos por resfriamento direto
CN116475365A (zh) 2022-01-13 2023-07-25 米尼翁大学 用于超声处理和转移熔融金属的装置及其方法

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JPS60166146A (ja) * 1984-02-06 1985-08-29 Mitsubishi Heavy Ind Ltd 薄板連続鋳造装置
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JP2649066B2 (ja) * 1988-08-03 1997-09-03 新日本製鐵株式会社 双ロール式薄板連続鋳造方法

Also Published As

Publication number Publication date
BR9002745A (pt) 1991-08-20
FR2648063A1 (fr) 1990-12-14
EP0403411A1 (fr) 1990-12-19
ES2044517T3 (es) 1994-01-01
ATE95092T1 (de) 1993-10-15
DK0403411T3 (da) 1994-02-07
JPH0741374B2 (ja) 1995-05-10
DE69003600D1 (de) 1993-11-04
DE69003600T2 (de) 1994-03-31
CA2018684C (fr) 2002-09-10
CA2018684A1 (fr) 1990-12-12
US5355935A (en) 1994-10-18
FR2648063B1 (fr) 1994-03-18
KR910000267A (ko) 1991-01-29
KR970005364B1 (ko) 1997-04-15
JPH0366449A (ja) 1991-03-22

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