EP3326736B1 - Dispositif pour la fabrication des ames en aluminium - Google Patents

Dispositif pour la fabrication des ames en aluminium Download PDF

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Publication number
EP3326736B1
EP3326736B1 EP17203855.6A EP17203855A EP3326736B1 EP 3326736 B1 EP3326736 B1 EP 3326736B1 EP 17203855 A EP17203855 A EP 17203855A EP 3326736 B1 EP3326736 B1 EP 3326736B1
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EP
European Patent Office
Prior art keywords
roller
aluminium
web
thickness
liquid state
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
EP17203855.6A
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German (de)
English (en)
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EP3326736A1 (fr
Inventor
Matteo PACI
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Profilglass SpA
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Profilglass SpA
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Publication of EP3326736A1 publication Critical patent/EP3326736A1/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
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B22D11/003—Aluminium alloys
    • 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
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • 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
    • B22D11/0648—Casting surfaces
    • B22D11/0651—Casting wheels
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level

Definitions

  • This invention relates to a machine for making aluminium webs, by means of a continuous casting process.
  • the machine according to this invention is used for the formation of aluminium webs by means of a process for the continuous casting of the molten aluminium, referred to by experts in the field as "twin roll casting".
  • the machines of this type basically comprise:
  • the upper roller and the lower roller are rotating continuously in opposite directions, in such a way as to allow a feed of the continuous web in the same direction as the feed direction.
  • the pair of rollers is mutually spaced, radially or relative to the corresponding relative axis, in such a way as to define an opening which will determine the thickness of the web being formed (distance calculated from the theoretical point of tangency of the two rollers). This distance is controlled by supporting and regulating (hydraulic) elements connected to each of the two rollers.
  • means for the passage of a fluid
  • means for cooling the outside surface of the rollers act on both the rollers to allow a correct passage of the metal from the liquid state to the solid state.
  • the injector is positioned with its outlet opening close to the opening defined by the two rollers and in a withdrawn position relative to the axis of the two rollers, which is also called the "set back" distance (or, also, “contact arc”).
  • the outlet opening of the injector supplies the molten metal necessary for formation of the web towards the two rollers according to a predetermined width which is defined by containment elements or walls, located at the sides of the injector and which act as a barrier to the metal in the above-mentioned set back zone.
  • the solidification step of the metal that is to say, the passage of the metal from the liquid state at the outlet from the injector to the solid state at the outlet from the two rollers, occurs in the above-mentioned set back zone wherein the molten metal and the rollers come into contact.
  • the two rollers remove heat from the metal until it reaches firstly a semi-solid state and then a solid state to allow the formation of the web.
  • the upper roller and the lower roller generate the shape of the product as elements for forming the web.
  • Machine structures for the formation of aluminum webs are known from the documents WO2015/117696, "Tailored strips by welding" (MARKUS DAAMEN et al. ), “Profile Strip Casting" (MICHELE VIDONI et al.) and WO2006/013654 .
  • the strip being fed downstream of the rollers (normally along a horizontal plane) is then wound to form a roll.
  • the machine and the relative just described above allow the production of webs of variable thickness (in a range of usually between 2 and 12 mm) while the width of the web can be adjusted within a range which will be a function of the capacity of each machine.
  • the size of the rollers varies according to the plant and is selected depending on of the subsequent transformation steps.
  • the two surfaces of greatest extension generated by the process have an extension which is flat and parallel to each other.
  • the aim of this invention is to provide a machine for making aluminium webs which overcomes the above-mentioned drawbacks of the prior art.
  • the aim of this invention is to provide a machine for making aluminium webs, in particular by the continuous casting process, which is able to form aluminium webs having surfaces with different mechanical strength characteristics in a fast, safe and precise manner.
  • a further aim of this invention is to provide a machine for making aluminium webs, in particular by the continuous casting process, which is able to form webs with zones with different mechanical strength with different geometrical configurations and is able to modify the zones, in a fast and safe manner, as a function of the production requirements.
  • the machine for forming aluminium webs comprises a unit for feeding aluminium in the liquid state along a feed line having a feed direction.
  • the machine also comprises an injector of the aluminium in the liquid state, positioned downstream of the feed unit relative to the feed direction having an inlet opening to receive the aluminium in the liquid state from the feed unit and an outlet opening for feeding a calculated quantity of aluminium in the liquid state towards a solidification zone.
  • the machine comprises an upper roller and a lower roller with parallel axes, rotating relative to each other according to opposite directions, spaced from each other to form an opening or channel having a first dimension and defining the solidification zone.
  • the upper roller and the lower roller are configured for receiving aluminium in the liquid state from the outlet opening of the injector and forming, at the outlet, a continuous, solid web of aluminium, having at least a thickness equivalent to the first dimension of the opening and at least an upper surface and a lower surface.
  • the machine also comprises one between the upper roller and the lower roller with at least one recess made on the relative surface of contact with the aluminium, in such a way as to form on the corresponding upper surface or lower surface of the web being formed a corresponding zone, at least repeated cyclically, having a thickness greater than the thickness of the remaining web being formed.
  • the aluminium webs formed may have zones with over-thicknesses located and defined by the geometry of the recesses.
  • the geometry of the web makes it possible to produce webs from continuous casting with zones clearly defined and with a greater mechanical strength relative to the remaining surface of the web, depending on intended requirements of the semi-finished product.
  • the structure of the machine makes it possible to make one or more recesses, with a closed perimeter, with a continuous or discontinuous annular shape, which provides zones with a different geometrical configuration on the web, guaranteeing a high production flexibility as a function of the production requirements.
  • the technical sector of the machine 100 is that of forming semi-finished products made of aluminium web, preferably continuous, through a continuous casting lamination process.
  • the machine 100 for making webs 1 made of aluminium (see Figure 1 ) comprises a unit 2 for feeding aluminium in the liquid state along a feed line A having a feed direction V.
  • the machine 100 also comprises an injector 3 of the aluminium in the liquid state, positioned downstream of the feed unit 2 relative to the feed direction V having an inlet opening 4 to receive the aluminium in the liquid state from the feed unit 2 and an outlet opening 5 for feeding a calculated quantity of aluminium in the liquid state towards a solidification zone.
  • the machine 100 also comprises an upper roller 6 and a lower roller 7 (preferably cylindrical) with parallel axes X6 and X7.
  • the upper roller 6 and a lower roller 7 rotate relative to each other according to opposite directions V6, V7 and spaced from each other to form an opening or channel 8 having a first dimension L8 and defining the solidification zone.
  • first dimension is used to mean a value (which can be modified) calculated between the two rollers in the hypothetical tangential point and relative to the corresponding relative axis.
  • the upper roller 6 and the lower roller 7 are configured for receiving aluminium in the liquid state from the outlet opening 5 of the injector 3 and forming, at the outlet, a continuous, solid web 1 of aluminium, having at least a thickness S1 equivalent to the first width L8 and at least an upper surface 1a and a lower surface 1b (the solid web 1 moves along the feed direction V thanks to the opposite directions V6 and V7 of rotation of the two rollers 6 and 7).
  • At least one between the upper roller 6 and the lower roller (7) has at least one recess 9, 10 made on the relative surface 6a, 7a of contact with the aluminium, in such a way as to form on the corresponding upper surface 1a or lower surface 1b of the web 1 being formed a corresponding zone 12, 13, 14, at least repeated cyclically, having a thickness S12, S13, S14 greater than the thickness S1 of the remaining web 1 being formed.
  • one of the two rollers is mechanically machined to have a different contact surface with the aluminium being solidified to obtain, during the continuous casting process, a greater thickness along the web in such a way as to modify the mechanical strength of the web.
  • the web will, therefore, have "asymmetrical" zones in its transversal and/or longitudinal cross-section as a function of the recess created.
  • the geometrical configuration of the recess and the number of recesses (and the depths) can have multiple combinations as a function of the needs for the use of the aluminium webs, without thereby limiting the scope of protection of this invention.
  • a zone with a thickness greater than the thickness of the web is used to mean that the zone has a thickness which comprises the sum of the thickness of the web and the additional thickness due to the recess and which is quantified (as described in more detail below) by the depth of the recess in the roller.
  • the at least one recess 9, 10 is formed on the upper roller 6.
  • the at least one recess comprises at least one impression 9 with a closed perimeter made on a curved portion of the contact surface 6a of the upper roller 6.
  • the impression 9 is configured to form on the corresponding upper surface 1a of the web 1 being formed a corresponding area 12 with a closed perimeter, repeated cyclically, having a thickness S12 greater than the thickness S1 of the remaining web 1.
  • the impression 9 has a circular shape in such a way as to form a closed cylindrical zone with a thickness S12 along the surface 1a of the web 1 being formed, repeated cyclically, at a distance or spacing equal to a circumference of the upper roller 6.
  • the impression 9 has an elliptical shape in such a way as to form a closed elliptical zone with a thickness S12 along the surface 1a of the web 1 being formed, repeated cyclically, at a distance or spacing equal to the circumference of the upper roller 6.
  • the at least one recess comprises at least one partial annular groove 10 formed along the upper surface 6a of contact of the upper roller 6 and configured to form on the corresponding upper surface 1a of the web 1 being formed a corresponding continuous band-like zone 13 having a thickness S13 greater than the thickness S1 of the remaining web 1.
  • the partial annular groove 10 has an interruption along the upper surface 6a of contact of the roller 6 designed to form a corresponding partial interruption between a previous continues band-like zone 13 and a subsequent continuous band-like zone 13' on the continuous web 1 (see Figures 3 and 4 ), in such a way as to form a spacing P equal to a circumference of the upper roller 6.
  • the spacing P can vary as a function of the dimension, that is to say, the circumference of the roller or of the rollers 6 and 7.
  • FIG. 5 A constructional solution according to an example that does not belong to the claimed invention is illustrated in Figure 5 , wherein the at least one recess comprises at least one continuous groove 11 (annular) formed along the contact surface of the upper roller 6.
  • the continuous groove 11 is configured to form on the corresponding upper surface 1a of the web 1 being formed a corresponding continuous band-like zone 14 (shown partially dotted in Figure 4 ) having a thickness S14 greater than the thickness S1 of the remaining web 1.
  • the solution allows a series of structural combinations such as to define several zones with greater thickness on the web being formed.
  • the at least two recesses 9, 10 are made on the at least one roller 6 or 7 with the same depth P9, P10 calculated starting from the surface of contact 6a or 7a of the at least one roller 6 or 7 in such a way as to generate corresponding zones 12, 13, 14 on the web 1 being formed having same thicknesses S12, S13, S14, greater than the thickness S1 of the remaining web 1.
  • the at least two recesses 9, 10 are made on the at least one roller 6 or 7 with corresponding different depths P9, P10 calculated starting from the surface of contact 6a or 7a of the at least one roller 6 or 7 in such a way as to generate corresponding zones 12, 13, 14 on the web 1 being formed having different thicknesses S12, S13, S14, again greater than the thickness S1 of the remaining web 1.
  • the recess illustrated in Figure 6 wherein the at least one recess comprises a groove 15 with a helical extension formed along the surface of contact 6a or 7a of the at least one roller 6 or 7 and extending about the axis X6 or X7 of the roller 6 or 7 in such a way as to form on the corresponding upper surface 1a or lower surface 1b of the web being formed a corresponding zone (continuous) having a thickness greater than the thickness S1 of the remaining web 1 being formed.
  • the upper roller 6 and the lower roller 7 are connected to corresponding hydraulic supporting means (not illustrated) which are capable of modifying the relative distance between the two rollers in such a way as to modify the size of the channel 8.
  • rollers 6 and 7 there are corresponding cooling units (inner) for cooling the contact surfaces 6a and 7a (not illustrated).
  • the machine may also comprise a surface (usually horizontal and not fully illustrated) for supporting the webs formed as they move forward.
  • the web being formed may be suspended and moved by a pulling force exerted by a winding reel on which the web is progressively wound.
  • the above-mentioned solidification zone is defined by containment walls (not illustrated), located to the sides of the outlet opening of the injector and which act as a lateral barrier to the aluminium in the liquid state being fed.
  • the feed unit 2 comprises a tank 16 for containing aluminium in the liquid state.
  • a supply channel 17 configured to supply the aluminium in the liquid state to the injector 3.
  • a unit 18 for regulating the flow rate of the aluminium in the liquid state is positioned between the containment tank 16 and the supply channel 17.
  • the feed unit 2 comprises a sensor 19 for measuring the level of the aluminium in the liquid state in the supply channel 17.
  • the feed unit 2 also comprises a control unit 20 connected to the measurement sensor 19 and the unit 18 for regulating the flow rate.
  • the control unit 20 is configured for controlling, with corresponding signals S20, the regulating unit 18 between several operating configurations between a minimum opening or a maximum opening (modular regulation) as a function of a given level measurement value, sent by the measurement sensor 19, different from or equal to a reference value set in the control unit 20.
  • control unit 20 can be programmed to send, irrespective of the measurement data of the control sensor 19, at least one signal configured to activate the regulating unit 18 towards its maximum opening at the passage of the at least one recess 9, 10, 11 or 15 of the at least one roller 6 or 7 in the solidification zone.
  • a machine structured in this way achieves the pre-set aims thanks to which it is possible to obtain aluminium webs of the "asymmetrical" type, that is to say, with clearly precise zones of greater thickness thanks to which zones with a greater mechanical strength are obtained.
  • the machine has a high level of operating flexibility thanks to which it is possible to modify the geometries as a function of the requirements of components made with the respective webs.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulding By Coating Moulds (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Claims (7)

  1. Machine pour la fabrication d'âmes (1) en aluminium, comprenant au moins :
    - une unité (2) d'alimentation en aluminium à l'état liquide le long d'une ligne d'alimentation (A) comportant une direction d'alimentation (V) ;
    - un injecteur (3) de l'aluminium à l'état liquide, positionné en aval de l'unité d'alimentation (2) par rapport à la direction d'alimentation (V) comportant une ouverture d'entrée (4) pour recevoir l'aluminium à l'état liquide de l'unité d'alimentation (2) et une ouverture de sortie (5) pour alimenter une quantité calculée d'aluminium à l'état liquide vers une zone de solidification ;
    - un rouleau supérieur (6) et un rouleau inférieur (7) avec des axes parallèles (X6, X7), tournant l'un par rapport à l'autre selon des directions opposées (V6, V7), espacés l'un de l'autre pour former une ouverture ou un canal (8) ayant une première dimension (L8) et définissant la zone de solidification ; le rouleau supérieur (6) et le rouleau inférieur (7) étant configurés pour recevoir de l'aluminium à l'état liquide de l'ouverture de sortie (5) de l'injecteur (3) et former, à la sortie, une âme solide continue (1) d'aluminium, ayant au moins une épaisseur (S1) équivalente à la première largeur (L8) et au moins une surface supérieure (1a) et une surface inférieure (1b), dans laquelle au moins un entre le rouleau supérieur (6) et le rouleau inférieur (7) comporte au moins un renfoncement (9, 10) réalisé sur la surface relative (6a, 7a) de contact avec l'aluminium, de manière à former, sur la surface supérieure (1a) ou la surface inférieure (1b) correspondante de l'âme (1) étant formée, une zone correspondante (12, 13, 14), au moins répétée de manière cyclique, ayant une épaisseur (S12, S13, S14) supérieure à l'épaisseur (S1) du reste de l'âme (1) étant formée,
    caractérisée en ce que
    l'au moins un renfoncement comprend au moins une impression (9) avec un périmètre circulaire ou elliptique fermé réalisé sur une partie incurvée de la surface de contact (6a ou 7a) de l'au moins un rouleau (6 ou 7) ; l'impression (9) étant configurée pour former sur la surface supérieure (1a) ou la surface inférieure (1b) correspondante de l'âme (1) étant formée une zone correspondante (12) avec un périmètre fermé, répétée de manière cyclique, ayant une épaisseur (S12) supérieure à l'épaisseur (S1) de l'âme restante (1),
    ou en ce que
    l'au moins un renfoncement comprend au moins une rainure annulaire partielle (10) formée le long de la surface (6a ou 7a) de contact de l'au moins un rouleau (6 ou 7) et configurée pour former sur la surface supérieure (1a) ou la surface inférieure (1b) correspondante de l'âme (1) étant formée une zone continue correspondante en forme de bande (13) ayant une épaisseur (S13) supérieure à l'épaisseur (S1) de l'âme restante (1) ; la rainure annulaire partielle (10) comportant une interruption le long de la surface (6a ou 7a) de contact de l'au moins un rouleau (6 ou 7) conçue pour former une interruption partielle correspondante entre une zone en forme de bande continue (13) précédente et une zone en forme de bande continue (13') suivante sur l'âme continue (1), de manière à former un espacement (P) égal à une circonférence de l'au moins un rouleau (6 ou 7).
  2. Machine selon la revendication 1, dans laquelle sur au moins un entre le rouleau supérieur (6) et le rouleau inférieur (7), se trouvent au moins deux renfoncements (9, 10) espacés l'un de l'autre au moins le long de l'extension axiale de l'au moins un rouleau (6 ou 7).
  3. Machine selon la revendication 2, dans laquelle les au moins deux renfoncements (9, 10) sont réalisés sur l'au moins un rouleau (6 ou 7) avec la même profondeur (P9, P10) calculée à partir de la surface de contact (6a ou 7a) de l'au moins un rouleau (6 ou 7) de manière à générer des zones correspondantes (12, 13, 14) sur l'âme (1) étant formée ayant les mêmes épaisseurs (S12, S13, S14) supérieures à l'épaisseur (S1) de l'âme restante (1) .
  4. Machine selon la revendication 2, dans laquelle les au moins deux renfoncements (9, 10) sont réalisés sur l'au moins un rouleau (6 ou 7) avec des profondeurs différentes correspondantes (P9, P10) calculées à partir de la surface de contact (6a ou 7a) de l'au moins un rouleau (6 ou 7) de manière à générer des zones correspondantes (12, 13, 14) sur l'âme (1) étant formée ayant des épaisseurs différentes (S12, S13, S14) à nouveau supérieures à l'épaisseur (S1) de l'âme restante (1) .
  5. Machine selon l'une quelconque des revendications précédentes, dans laquelle l'au moins un renfoncement (9, 10) est réalisé sur le rouleau supérieur (6).
  6. Machine selon l'une quelconque des revendications précédentes, dans laquelle l'unité d'alimentation (2) comprend :
    - un réservoir (16) destiné à contenir de l'aluminium à l'état liquide,
    - un canal d'alimentation (17) configuré pour alimenter l'injecteur (3) en aluminium à l'état liquide ;
    - une unité (18) servant à réguler le débit de l'aluminium à l'état liquide positionnée entre le réservoir de contenance (16) et le canal d'alimentation (17) ;
    - un capteur (19) servant à mesurer le niveau de l'aluminium à l'état liquide dans le canal d'alimentation (17) ;
    - une unité de contrôle (20) connectée au capteur de mesure (19) et à l'unité (18) de régulation du débit ; l'unité de contrôle (20) étant configurée pour contrôler, avec des signaux correspondants (S20), l'unité de régulation (18) entre plusieurs configurations de fonctionnement comprises entre une ouverture minimale ou une ouverture maximale en fonction d'une valeur de mesure de niveau donnée, envoyée par le capteur de mesure (19), différente ou égale à une valeur de référence établie dans l'unité de contrôle (20).
  7. Machine selon la revendication 6, dans laquelle l'unité de contrôle (20) est programmée pour envoyer, indépendamment des données de mesure du capteur de contrôle (19), au moins un signal configuré pour amener vers une ouverture maximale l'unité de régulation (18) au passage de l'au moins un renfoncement (9, 10, 11) de l'au moins un rouleau (6 ou 7) dans la zone de solidification.
EP17203855.6A 2016-11-28 2017-11-27 Dispositif pour la fabrication des ames en aluminium Active EP3326736B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102016000120426A IT201600120426A1 (it) 2016-11-28 2016-11-28 Macchina per la formazione di nastri in alluminio.

Publications (2)

Publication Number Publication Date
EP3326736A1 EP3326736A1 (fr) 2018-05-30
EP3326736B1 true EP3326736B1 (fr) 2022-05-04

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IT (1) IT201600120426A1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006013654A1 (fr) * 2004-08-06 2006-02-09 Central Motor Wheel Co., Ltd. Dispositif pour le laminage direct de metal en fusion
GB2522873A (en) * 2014-02-07 2015-08-12 Siemens Vai Metals Tech Gmbh A method of forming tailored cast blanks

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IT201600120426A1 (it) 2018-05-28

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