EP0798060A1 - Machine d'élaboration de bandes métalliques par coulée continue, en particulier pour l'élaboration de bandes très larges - Google Patents

Machine d'élaboration de bandes métalliques par coulée continue, en particulier pour l'élaboration de bandes très larges Download PDF

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Publication number
EP0798060A1
EP0798060A1 EP97103820A EP97103820A EP0798060A1 EP 0798060 A1 EP0798060 A1 EP 0798060A1 EP 97103820 A EP97103820 A EP 97103820A EP 97103820 A EP97103820 A EP 97103820A EP 0798060 A1 EP0798060 A1 EP 0798060A1
Authority
EP
European Patent Office
Prior art keywords
drum
continuous
belt
continuous belt
machine according
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Withdrawn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
EP97103820A
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German (de)
English (en)
Inventor
Giulio Properzi
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0798060A1 publication Critical patent/EP0798060A1/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Withdrawn legal-status Critical Current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
    • B22D11/06—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
    • B22D11/0677—Accessories therefor for guiding, supporting or tensioning the casting belts
    • 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
    • B22D11/0602—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a casting wheel and belt, e.g. Properzi-process

Definitions

  • the present invention relates to a machine for producing metal strips by continuous casting, particularly for producing very wide metal strips.
  • metal strips obtained by continuous casting have been manufactured with the method known as "wheel and belt", which is instead used extensively for the production of bars having a trapezoidal cross-section.
  • This method uses a casting machine provided with two wheels arranged on a vertical plane.
  • the lower wheel has, on its lateral surface, a peripheral groove which is closed by a belt welded end to end and tensioned on the lower wheel by the upper wheel.
  • the peripheral groove of the rotating lower wheel and the belt form a continuous casting die which is cooled by sprayers located inside the lower wheel and outside the belt, thus solidifying the liquid metal poured into the continuous die.
  • a machine of this kind is disclosed for example in British patent 1,015,984.
  • the basic concept of the wheel-and-belt machine has subsequently been reused by differently placing the pulley or pulleys used to press and/or tension said belt.
  • Two improvements of this kind, devised by Rigamonti and Mann, are described by D.M. Lewis in Metallurgical Reviews 1961, vol. 6, no. 22, page 158, and in Aluminium 37 (1961), no. 4, S 209/14.
  • the wheel-and-belt method has, with respect to methods using two cylinders, the advantage that it allows very high hourly production rates, since the heat exchange surface for dissipating the molten metal heat is considerably larger. With respect to methods using two superimposed track-shaped belts or two tracks with bars/blocks, the wheel-and-belt method is cheaper in terms of investment and easier to manage.
  • the belt no longer maintains the necessary flatness owing to two basic reasons: the tension required to keep the belt in close contact with the edges of the wheel, so as to hermetically close the solidification chamber or continuous die, and the deformation of the steel belt owing to the expansion caused by the heating produced by the molten or freshly solidified metal which makes direct contact with said belt.
  • a principal aim of the present invention is to provide a continuous casting machine of the wheel-and-belt type which can produce even very wide metal strips without causing flatness problems in the manufactured metal strip.
  • an object of the present invention is to provide a machine which can use the technology of continuous-casting machines of the wheel-and-belt type for the production of bars having a trapezoidal cross-section, which has been used and refined for years, ensuring high quality of the resulting metal strip.
  • Another object of the invention is to provide a machine allowing to produce metal strips, particularly very wide metal strips, with a very high hourly production rate.
  • Another object of the invention is to provide a machine which, through its high productivity, can feed, if required, an in-line rolling unit, fully utilizing its production capacity.
  • a machine for producing metal strips by continuous casting comprising: a drum, with a horizontal axis and rotatable about said axis, having, on its lateral surface, a recess that forms the bottom and two mutually opposite side walls of a continuous-casting die; a continuous belt, running along a closed path and wrapping, for part of its extension, around a portion of the lateral surface of said drum, resting on the edges that delimit said recess to close said continuous-casting die; means for tensioning said belt; means for conveying molten metal inside said continuous-casting die in the region affected by said continuous belt; means for cooling the regions of said belt and of said drum which are in contact with the metal conveyed into said continuous-casting die; characterized in that said continuous belt is made of a material that can be polarized magnetically and in that it comprises means for generating a magnetic field affecting said continuous belt over at least part of its
  • the machine generally designated by the reference numeral 1, comprises a footing 2 supporting a drum 3 which has a horizontal axis 3a and is rotatable about said axis 3a.
  • the drum 3 has, on its lateral surface, a recess 4 forming the bottom 4a and two mutually opposite side walls 4b and 4c of a continuous-casting die.
  • the drum 3 can be actuated about its own axis 3a by means of a conventional gearmotor which is not illustrated for the sake of simplicity.
  • the machine also comprises a continuous belt 5 running along a closed path and winding, for part of its extension, around part of the lateral surface of the drum 3, resting on the edges 6 and 7 which laterally delimit the recess 4 and thus closing the continuous-casting die.
  • the belt 5 winds around three pulleys 8, 9, and 10 which are arranged so that their axes are parallel to the axis 3a of the drum 3.
  • the pulleys 8, 9, and 10 are freely supported about their respective axes and the pulley 10 can shift, parallel to its own axis 10a, so as to vary the tension of the belt 5.
  • This shift can be achieved, in a per se known manner, for example by means of a fluid-actuated cylinder 11 pivoted to the footing 2 with its body and acting, with the stem 12 of its piston, on the support of the pulley 10.
  • the pulley 8 is preferably arranged so as to be tangent to the upper end of the drum 3, whilst the pulley 9 is spaced with respect to the pulley 8 by an angle of substantially 180 o with respect to the axis 3a, so as to be tangent to the lower end of the drum 3.
  • the machine also comprises means for conveying the molten metal into the continuous-casting die in the region affected by the belt 5.
  • These conveyance means can be constituted, in a per se known manner, by one or more crucibles 13 pouring the molten metal into the continuous-casting die proximate to the upper end of the drum 3, i.e., in the region where the belt 5 starts to be tangent to the drum 3, so that the cast molten metal, as a consequence of the rotation of the drum 3 and of the consequent translatory motion of the belt 5 by friction, is entrained into the closed portion of the continuous-casting die.
  • means are provided for cooling the regions of the belt 5 and of the drum 3 which make contact with the metal cast into the continuous-casting die.
  • the cooling means can be constituted, in a per se known manner, by a plurality of nozzles 23 arranged inside the drum 3 and directed towards the inner lateral surface of the drum and by nozzles 14 supported outside the drum 3 and directed towards the side of the belt 5 which faces away from the drum 3.
  • the nozzles 23 and 14 can be supplied with a pressurized fluid so as to deliver, according to requirements, a pressurized coolant or a mist of coolant and air.
  • the belt 5 is made of a material that can be polarized magnetically, such as for example mild or stainless steel of the ferromagnetic type.
  • the belt 5 can also be constituted by a woven metal mesh according to requirements.
  • means are provided for generating a magnetic field affecting the belt 5 at least over part of the portion that is in contact with the drum 3 starting from the region where the molten metal is poured into the continuous-casting die, so as to contrast, by means of magnetic forces, the deformation of the belt 5, keeping belt 5 parallel to the outer lateral surface of the drum 3.
  • Said means for generating a magnetic field can be constituted, as shown in particular in figures 1 and 2, by magnetic bars 16 having a rectangular, square, or round cross-section, which are parallel to the axis 3a of the drum 3.
  • the magnetic bars 16 and the nozzles 14 are mounted on a frame 17 movable on command towards or away from the axis 3a of the drum 3, for example through a screw 18, to allow replacement of the belt 5.
  • the bars 16 can be replaced with magnetic rollers having a small diameter which are supported by frame 17, so that they can rotate about their respective axes, which are parallel to the axis 3a, and can rotate about their own axes because of friction against the belt 5.
  • the means for generating a magnetic field can be constituted by electromagnets instead of by magnetic bars, i.e., permanent magnets.
  • the permanent magnets or electromagnets have an orientation of the magnetic field which is such as to apply centrifugal forces, i.e., forces directed away from the axis 3a of the drum 3, on the part of the belt 5 they face.
  • the magnetic bars or rollers can have a continuous structure or can be formed by a plurality of separate magnetic segments or by magnetized regions.
  • the magnetic bars 16 or the magnetic rollers used can have, on their side meant to rest against the opposite face of the belt 5 with respect to the drum, a coating layer made of a material having a low friction coefficient.
  • the magnetic bars or magnetic rollers, or other magnetic-field generation means used are spaced one from the other on the frame 17 so as to allow the placement of the nozzles 14 and the downward flow of the coolant released by said nozzles. If a covering layer of material having a low friction coefficient is used between the belt 5 and the magnetic bars or other means for generating a magnetic field, it is possible to provide, in the layer of material having a low friction coefficient, grooves for the flow of the coolant released by the nozzles 14.
  • pusher means are provided which act on the side of the belt 5 opposite to the drum 3 in order to keep the belt 5, over all its width, parallel to the cylindrical lateral surface of the drum 3.
  • the pusher means can be constituted, as shown, by a plurality of friction wheels 19 mounted in groups on shafts 20 which are supported by the frame 17 and are orientated so that their axes are parallel to the axis 3a.
  • the wheels 19 can be replaced with supporting sliding blocks or with balls or with other technically equivalent supporting means acting on the belt 5 in the opposite direction with respect to the force produced by the magnetic field generated by the above-mentioned permanent magnets or electromagnets.
  • baffle element 20 which separates the metal strip 21, produced by the solidification of the metal cast into the continuous-casting die, from the drum 3 and moves it away from said drum 3.
  • the liquid metal is cast, by means of the crucible 13, at the upper end of the drum 3 in the continuous-casting die delimited by the belt 5 and by the drum 3, which is rotated about its own axis counterclockwise in figures 1 and 2.
  • the belt 5 is moved by friction and the molten metal starts to solidify as it advances from the upper end of the drum 3 towards the lower end.
  • the belt 5 by making contact with the molten or freshly solidified metal, is subjected to considerable heating, which would cause expansion of the layers of the belt 5 that are in direct contact with the molten or freshly solidified metal, this expansion being greater than the expansion on the side directed away from the drum and cooled.
  • This expansion together with the tension whereto the portion of belt 5 wound around the drum 3 is subjected, would cause an undesirable deformation of the belt 5 towards the axis 3a of the drum 3, with a consequent deformation of the metal strip being cast.
  • the wheels 19, by providing supporting points for the side of the belt 5 which is opposite with respect to the drum 3, have the effect of avoiding deformation of the belt 5 away from the axis 3a, thus allowing to use without problems a higher magnetic force than theoretically required to contrast the deformation of the belt 5 towards the axis 3a.
  • the strip 21 produced by the solidification of the molten metal introduced in the continuous-casting die is moved away by the baffle element 20 which is laterally adjacent to the drum 3 proximate to the pulley 9.
  • the strip 21 is then conveyed on rollers 22 towards gathering, cutting, or rolling processes.
  • the machine according to the invention fully achieves the intended aim, since it allows to continuously produce strips with a width that can vary between 300 mm and 1000 mm and more, with excellent flatness on both sides, nonetheless maintaining the typical advantages of wheel-and-belt continuous-casting machines.
  • the magnetic field generation means can be provided by using studs or tracks with ferrite or neodymium magnets which can assume both substantially linear configurations, and thus be arranged parallel to the axis 3a of the drum 3, and curved configurations, allowing great freedom in terms of spatial arrangement, or by using a plurality of permanent magnets or electromagnets in the form of small plates or cylinders of alnico, ferrite, or neodymium.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Moulding By Coating Moulds (AREA)
EP97103820A 1996-03-25 1997-03-07 Machine d'élaboration de bandes métalliques par coulée continue, en particulier pour l'élaboration de bandes très larges Withdrawn EP0798060A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96MI000589A IT1283301B1 (it) 1996-03-25 1996-03-25 Macchina per la produzione,mediante colata continua,di nastri metallici,particolarmente per la produzione di nastri metallici
ITMI960589 1996-03-25

Publications (1)

Publication Number Publication Date
EP0798060A1 true EP0798060A1 (fr) 1997-10-01

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EP97103820A Withdrawn EP0798060A1 (fr) 1996-03-25 1997-03-07 Machine d'élaboration de bandes métalliques par coulée continue, en particulier pour l'élaboration de bandes très larges

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EP (1) EP0798060A1 (fr)
IT (1) IT1283301B1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005068108A1 (fr) * 2004-01-14 2005-07-28 Lamec Ag Machine de coulee
IT201700021482A1 (it) * 2017-02-24 2018-08-24 Sovema Group S P A Macchina per la formatura in continuo di un nastro in piombo
CN109396366A (zh) * 2018-10-09 2019-03-01 青田美进家五金锁业有限公司 一种铝带熔铸成型装置
DE202021102420U1 (de) 2020-05-11 2021-08-17 Danieli & C. Officine Meccaniche S.P.A. Gießdüse für Stranggießmaschinen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB861273A (en) * 1959-05-21 1961-02-15 Cie Metaux Doverpelt Lommel Improvements in and relating to the casting of non-ferrous metals
GB1388378A (en) * 1971-02-16 1975-03-26 Alcan Res & Dev Apparatus for continuous casting
EP0108926A1 (fr) * 1982-11-05 1984-05-23 Allied Corporation Procédé et appareil pour maintenir magnétiquement un ruban de métal coulé contre une bande
JPS59113958A (ja) * 1982-12-20 1984-06-30 Hitachi Ltd 薄板金属保持装置
EP0289433A1 (fr) * 1987-04-21 1988-11-02 Aluminium Pechiney Perfectionnement au procédé de solidification de métal liquide dans une roue de coulée
WO1993004801A1 (fr) * 1991-08-29 1993-03-18 Julian Szekely Procede et appareil d'agitation electromagnetique de metaux en fusion dans un dispositif de coulee a roues

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB861273A (en) * 1959-05-21 1961-02-15 Cie Metaux Doverpelt Lommel Improvements in and relating to the casting of non-ferrous metals
GB1388378A (en) * 1971-02-16 1975-03-26 Alcan Res & Dev Apparatus for continuous casting
EP0108926A1 (fr) * 1982-11-05 1984-05-23 Allied Corporation Procédé et appareil pour maintenir magnétiquement un ruban de métal coulé contre une bande
JPS59113958A (ja) * 1982-12-20 1984-06-30 Hitachi Ltd 薄板金属保持装置
EP0289433A1 (fr) * 1987-04-21 1988-11-02 Aluminium Pechiney Perfectionnement au procédé de solidification de métal liquide dans une roue de coulée
WO1993004801A1 (fr) * 1991-08-29 1993-03-18 Julian Szekely Procede et appareil d'agitation electromagnetique de metaux en fusion dans un dispositif de coulee a roues

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
H. W. BRAND: "Neue kontinuierliche Bandgiess- und -walzanlagen für Aluminium", ALUMINIUM, vol. 37, no. 4, 1961, DÜSSELDORF,DE, pages 209 - 214, XP002034983 *
PATENT ABSTRACTS OF JAPAN vol. 008, no. 234 (M - 334) 26 October 1984 (1984-10-26) *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005068108A1 (fr) * 2004-01-14 2005-07-28 Lamec Ag Machine de coulee
US7614441B2 (en) 2004-01-14 2009-11-10 Lamec Ag Casting machine
KR101093400B1 (ko) 2004-01-14 2011-12-14 라메크 아게 주조기
CN1964806B (zh) * 2004-01-14 2012-01-25 拉米克股份公司 铸造机、铸造方法及更换铸造机块部件的方法
IT201700021482A1 (it) * 2017-02-24 2018-08-24 Sovema Group S P A Macchina per la formatura in continuo di un nastro in piombo
EP3366388A1 (fr) * 2017-02-24 2018-08-29 Sovema Group S.P.A. Machine de fabrication de barres continues de plomb
CN109396366A (zh) * 2018-10-09 2019-03-01 青田美进家五金锁业有限公司 一种铝带熔铸成型装置
DE202021102420U1 (de) 2020-05-11 2021-08-17 Danieli & C. Officine Meccaniche S.P.A. Gießdüse für Stranggießmaschinen

Also Published As

Publication number Publication date
ITMI960589A0 (fr) 1996-03-25
IT1283301B1 (it) 1998-04-16
ITMI960589A1 (it) 1997-09-25

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