EP0022566B1 - Procédé et dispositif pour le moulage électromagnétique de métaux liquides ou d'alliages, installation réfrigérante pour la coulée électromagnétique - Google Patents

Procédé et dispositif pour le moulage électromagnétique de métaux liquides ou d'alliages, installation réfrigérante pour la coulée électromagnétique Download PDF

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Publication number
EP0022566B1
EP0022566B1 EP80103976A EP80103976A EP0022566B1 EP 0022566 B1 EP0022566 B1 EP 0022566B1 EP 80103976 A EP80103976 A EP 80103976A EP 80103976 A EP80103976 A EP 80103976A EP 0022566 B1 EP0022566 B1 EP 0022566B1
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EP
European Patent Office
Prior art keywords
coolant
casting surface
manifold
ingot
peripheral
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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
Application number
EP80103976A
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German (de)
English (en)
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EP0022566A1 (fr
Inventor
John C. Yarwood
Derek E. Tyler
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Olin Corp
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Olin Corp
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Publication date
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Publication of EP0022566A1 publication Critical patent/EP0022566A1/fr
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Expired 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
    • B22D11/01—Continuous casting of metals, i.e. casting in indefinite lengths without moulds, e.g. on molten surfaces
    • B22D11/015—Continuous casting of metals, i.e. casting in indefinite lengths without moulds, e.g. on molten surfaces using magnetic field for conformation, i.e. the metal is not in contact with a mould

Definitions

  • the invention relates to a process according to the preambles of claims 1 and 2, to an apparatus according to the preambles of claims 3, 5 and 6, and to a coolant manifold according to the preambles of claims 9, 11 and 12.
  • process, apparatus and coolant manifold are known in the art, for example as disclosed in US-A-3985179.
  • This invention provides a control of corner shape in continuous or semi-continuous electromagnetic casting of desired shapes, such as for example, sheet or rectangular ingots of metals and alloys.
  • desired shapes such as for example, sheet or rectangular ingots of metals and alloys.
  • the basic electromagnetic casting process has been known and used for many years for continuously or semi-continuously casting metals and alloys.
  • Known electromagnetic casting apparatus comprises a three part mold consisting of a water cooled inductor, a non-magnetic screen and a manifold for applying cooling water to the ingot being cast.
  • Such apparatus are exemplified in U.S. Patent No. 3,467,166 to Getselev et al and in U.S. Patent No. 3,605,865 to Getselev.
  • Containment of the molten metal is achieved without direct contact between the molten metal and any component of the mold. Solidification of the molten metal is achieved by direct application of water from the cooling manifold to the forming ingot shell.
  • the inductor is formed as part of the cooling manifold so that the cooling manifold supplies both coolant to solidify the casting and to cool the inductor. See U.S. Patent 4,004,631 to Goodrich et al.
  • Non-magnetic screens of the prior art are typically utilized to properly shape the magnetic field for containing the molten metal as exemplified in U.S. Patent No. 3,605,865 to Getselev.
  • Another approach with respect to use of non-magnetic screens is exemplified as well in U.S. Patent No. 3,985,179, to Goodrich et al. Goodrich et al. '179 describes the use of a shaped inductor in conjunction with a screen to modify the electromagnetic forming field.
  • a cooling medium is supplied upon the lateral face of the ingot in several cooling tiers arranged at various levels longitudinally of the ingot.
  • the solidification front can be maintained within the inductor by appropriate selection of one of the tiers.
  • the ingots are often cast with high radius of curvature ends or corners which is indicative of the need for improved ingot shape control at the corners of such ingots.
  • U.S. Patent No. 3,502,133 to Carson teaches utilizing a sensor in a continuous or semi-continuous casting mold to sense temperature variations at a particular location in the mold during casting.
  • the sensor controls application of coolant to the mold and forming ingot.
  • Use of such a device overcomes instabilities with respect to how much extra coolant is required at start up of the casting operation and just when or at what rate this excess cooling should be reduced.
  • the ultimate purpose of adjusting the flow of coolant is to maintain the freeze line of the casting at a substantially constant location.
  • Carson '133 teaches that ingots having a width to thickness ratio on the order of 3 to 1 or more possess an uneven cooling rate during casting when coolant is applied peripherally of the mold in a uniform manner. To overcome this problem, Carson '133 applies coolant to the wide faces of the ingot and/or the mold walls and not at all (or at least at a reduced rate) to the relatively narrow end faces of the ingot and/or the mold walls.
  • European Patent No. 15,870 relates to electromagnetic casting by using a cooling means having an annular slot between an electromagnetic screen and an insulation body, through which slot the coolant is passed.
  • the slot has the same level, inclination and flow cross-section throughout its entire length.
  • a deflecting body is arranged below the slot. The deflecting body deflects the coolant such that it impinges at the corners of the ingot at a lower level than between the corners.
  • European Patent No. 15,870 has an earlier priority data and an earlier filing date than the present Patent, but the corresponding application has been published after the priority date and the filing date of the present Patent.
  • Subject matter of the invention are processes for electromagnetic forming of molten metals or alloys into a casting as defined in claim 1 and 2.
  • a further subject matter of the invention are apparatus for electromagnetic forming of molten metals or alloys into a casting a defined in claims 3, 5 and 6.
  • coolant manifolds for use in electromagnetic forming of molten metals or alloys into a casting as defined in claims 9, 11 and 12.
  • controlled static head through metal head or pressure modification.
  • the invention utilizes controlled differential static head by control of cooling water application to obtain refinement of ingot shape, particularly at the corners of rectangular ingots or other desired elements of shape.
  • Control ingot shape may be effected by selection of the rate or location of cooling water application to the forming ingot shell within or below the containment inductor. Rounding off of corners in electromagnetic casting can be made less severe or of smaller radius by contouring the water application rate or elevation (or both) so that the rate of elevation is a minimum at the corners of the ingot. Reduction of the water application rate or lowering the application level serves to reduce the local heat extraction rate along an ingot transverse cross section line of constant height. This in turn lowers the position of the solidification front at the ingot corner and correspondingly raises the metal static head or pressure at the corner. This increased pressure results in the liquid metal approaching the inductor more closely at the corner and thus filling the corner to form a smaller radius of curvature at the corner before the increased static pressure is counterbalanced by an increased electromagnetic force.
  • a water manifold or cooling water application device is provided with drilled holes or slots of a size and/or local hole density which is modified to yield locally reduced rates of water application at the ingot or desired shape corners.
  • a water manifold or cooling water application device wherein the elevation of the supply holes is modified so as to apply water at the lowest elevation at the ingot or desired shape corners.
  • the holes or slots in a water manifold or cooling water application device are modified such that the angle of the holes or slots around the corners of the ingot cause the water to impinge on the ingot surface at a lower elevation at the ingot corners.
  • a water manifold or cooling water application device which produces a water application rate of zero over short distances at the corners of the ingot or desired shape to further accentuate the effects of reduced local cooling.
  • FIGURE 1 there is shown therein a prior art electromagnetic casting apparatus in accordance with U.S. Patent 4,158,379.
  • the electromagnetic casting mold 10 is comprised of an inductor 11 which is water cooled; a coolant manifold 12 for applying cooling water to the peripheral surface 13 of the metal being cast C; and a non-magnetic screen 14. Molten metal is continuously introduced into the mold 10 during a casting run, in the normal manner using a trough 15 and down spout 16 and conventional molten metal head control.
  • the inductor 11 is excited by an alternating current from a suitable power source (not shown).
  • the alternating current in the inductor 11 produces a magnetic field which interacts with the molten metal head 19 to produce eddy currents therein. These eddy currents in turn interact with the magnetic field and produce forces which apply a magnetic pressure to the molten metal head 19 to contain it so that it solidifies in a desired ingot cross section.
  • the molten metal head 19 is formed or molded into the same general shape as the inductor 11 thereby providing the desired ingot cross section.
  • the inductor may have any desired shape including circular or rectangular as required to obtain the desired ingot C cross section.
  • the purpose of the non-magnetic screen 14 is to fine tune and balance the magnetic pressure with the hydrostatic pressure of the molten metal head 19.
  • the non-magnetic screen 14 comprises a separate element as shown, and is not a part of the manifold 12 for applying the coolant.
  • a conventional ram 21 and bottom block 22 is held in the magnetic containment zone of the mold 10 to allow the molten metal to be poured into the mold at the start of the casting run.
  • the ram 21 and bottom block 22 are then uniformly withdrawn at a desired casting rate.
  • Solidification of the molten metal which is magnetically contained in the mold 10 is achieved by direct application of water from the cooling manifold 12 to the ingot surface 13.
  • the water is shown applied to the ingot surface 13 within the confines of the inductor 11.
  • the water may be applied, however, to the ingot surface 13 from above, within or below the inductor 11 as desired.
  • the solidification front 25 of the casting comprises the boundary between the molten metal head 19 and the solidified ingot C.
  • the location of the solidification front 25 at the ingot surface 13 results from a balance of the heat input from the superheated liquid metal 19 and the resistance heating from the induced currents in the ingot surface layer, with the longitudinal heat extraction from the cooling water application.
  • Coolant manifold 12 is arranged above the inductor 11 and includes at least one discharge port 28 at the end of extended portion 30 for directing the coolant against the surface 13 of the ingot or casting.
  • the discharge port 28 can comprise a slot or a plurality of individual orifices for directing the coolant against the surface 13 of the ingot C about the entire periphery of that surface.
  • Coolant manifold 12 is arranged for movement along vertically extending rails 38 and 39 axially of the ingot C such that extended portion 30 and discharge port28 can be moved between the non-magnetic screen 14 and the inductor 11. Axial adjustment of the discharge port 28 position is provided by means of cranks 40 mounted to screws 41.
  • the coolant is discharged against the surface of the casting in the direction indicated by arrows 43 to define the place of coolant application.
  • Figure 2 is a schematic cross-sectional representation of one embodiment of a system for application of a coolant in accordance with this invention.
  • Line 29 divides Figure 2 into two sides (A) and (B).
  • Side (A) shows a section through a face of rectangular ingot 20 and inductor 11' while side (B) shows a section through the corner of the same elements.
  • Coolant typically water, is supplied to the peripheral surface 13 of ingot 20 via holes 17 in inductor 11'.
  • dotted line 23 exemplifies the location of the solidification front at the corner of an ingot (side (B)) which is cooled by known uniform rate and height peripheral coolant flow directed to the surface 13 of rectangular ingot 20.
  • excess cooling at the corners of the ingot 20 cause the solidification front to rise in comparison to the elevation of the solidification front along the faces of the ingot 20 (side (A)), denoted by dashed line 24.
  • the height of the solidification front from the point of coolant impingement at the corners of the ingot 20 is greater than a, the height of the solidification front from the point of coolant impingement along the faces of the ingot 20.
  • coolant application devices are modified to produce controlled differential static head leading to refinement of ingot shapes at the corners, and in particular to form smaller radius of curvatures at ingot corners.
  • Control of ingot shape is effected in accordance with the present invention by selection of the rate and/or location of cooling water impingement upon the surface of forming ingot shells.
  • Rounding off of corners in electromagnetic casting can be made less severe or of smaller radius by contouring the water application rate and/or elevation so that the rate and/or elevation is a minimum at the corner of the ingot.
  • Reduction of the water application rate and/or lowering of the application level serves to reduce the local heat extraction rate along an ingot transverse cross section line of constant height. This in turn lowers the position of the solidification front at the ingot corners and correspondingly raises the metal static head or pressure at the corners.
  • This increased pressure results in the liquid metal approaching the inductor more closely at the corners and thereby filling the corner to form a smaller radius of curvature before the increased static pressure is counterbalanced by the increased electromagnetic force.
  • the elevation of the water impingement at the side (B) (the corner of ingot 20) in accordance with this invention is lower than the elevation at side (A) (along the face of the ingot 20) by virtue of the modification in elevation and angle of holes 17 in inductor 11'.
  • the solidification front 25 forms as a result at a height b above the point of water impingement (point 26) but at a level lower than the point 27 where the solidification front 25 forms along the faces of ingot 20.
  • extended portion 30 of modified coolant manifold 12" is constructed with discharge port 28 completely blocked off at or near the corners of ingot 20 (Side (B)) by portion 31 of coolant manifold 12".
  • discharge port 28 completely blocked off at or near the corners of ingot 20 (Side (B)) by portion 31 of coolant manifold 12".
  • slot cross section can be accurately contoured to produce a smoothly varying water flow rate with a minimum or zero flow rate at or near the ingot corner positions.
  • Figure 5 is a bottom plan view looking up into an extended portion 30 of a manifold and shows corners possessing different slot modifications in accordance with this invention.
  • Extended portion 30 comprises an inner wall 32, an outer wall 34 and a discharge port 28.
  • Corner C shows an unmodified full slot discharge port 28 with a slot width equal to that along the four faces of extended portion 30.
  • Corner D shows a contoured slot discharge port 28 with zero slot width (closed) at the exact corner 62 of extended portion 30.
  • Corner E shows a countoured slot discharge port 28 with zero slot width over about half the corner radius 64 of extended portion 30 and corner F shows zero slot width over about virtually the whole corner radius 66 of extended portion 30.
  • the aforedescribed variants in coolant applying equipment are typically designed so as to modify the coolant application rate and/or impact point within about three inches on either side of a corner while the maximum extent of the modifications in coolant application is to result in substantial absence of coolant application over about one inch or less of the ingot surface about the corner.
  • novel method and apparatus of the present invention find applicability in the electromagnetic casting of any shapes wherein it is desired to form portions thereon of low radius of curvature.

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

Claims (12)

1. Procédé de mise électromagnétique de métaux ou alliages fondus (19) sous forme d'éléments coulés (20) ayant une section transversale qui a, à la surface périphérique de coulée (13), au moins une première partie de faible rayon de courbure par rapport à une seconde partie adjacente, par coulée du métal ou alliage fondu (19) vers le bas dans un champ de forces électromagnétiques de mise en forme et par application d'un fluide de refroidissement à la surface périphérique (13) de l'élément coulé par un ou plusieurs orifices (17; 28) d'évacuation de fluide de refroidissement, caractérisé en ce que le fluide de refroidissement est appliqué à ladite première partie de la surface périphérique (13) de l'élément coulé par un ou plusieurs orifices d'évacuation (17; 28) disposés à un niveau inférieur et/ou dirigés vers le bas avec une plus grande inclinaison et/ou modifiés afin qu'ils donnent (ensemble) un plus faible débit d'application de fluide de refroidissement localement par rapport à la seconde partie.
2. Procédé de mise électromagnétique de métaux ou alliages fondus (19) sous forme d'un élément coulé (20) ayant une section transversale qui a, à la surface périphérique (13) de l'élément coulé, au moins une première partie de faible rayon de courbure par rapport à une seconde partie adjacente, par coulée du métal ou alliage fondu (19) vers le bas dans un champ de forces électromagnétiques de mise en forme et par application d'une fluide de refroidissement à la surface périphérique (13) de coulée, par un ou plusieurs orifices (17; 28) d'évacuation de fluide de refroidissement, caractérisé en ce qu'aucun fluide de refroidissement n'est appliqué à la première partie.
3. Appareil de mise électromagnétique de métaux ou alliages fondus (19) sous forme d'un élément coulé (20) ayant une section transversale qui a, à la surface périphérique (13) de l'élément coulé, au moins une partie de petit rayon de courbure par rapport à une seconde partie adjacente,
comprenant un dispositif (11; 11') destiné à créere, un champ de forces électromagnétiques qui met en forme le métal ou alliage fondu (19) coulé vers le bas, et un dispositif (12; 12'; 12") destiné à appliquer un fluide de refroidissement à la surface périphérique (13) de l'élément coulé par un ou plusieurs orifices (17; 28) d'évacuation de fluide de refroidissement,
caractérisé en ce que le dispositif (12; 12'; 12") d'application d'un fluide de refroidissement comporte, en face de la première partie de la surface périphérique (13) de l'élément coulé, un ou plusieurs orifices d'évacuation (17; 28) disposés à un plus faible niveau et/ou dirigés vers le bas avec une plus grande inclinaison et/ou modifiés afin qu'ils donnent (ensemble) un plus faible débit d'application de fluide de refroidissement localement par rapport à l'application à la seconde partie.
4. Appareil selon la revendication 3, caractérisé en ce que la densité des orifices d'évacuation (17; 28) est plus faible en face de la première partie qu'en face de la seconde partie.
5. Appareil de mise électromagnétique de métaux ou alliages fondus (19) sous forme d'un élément coulé (20) ayant une section transversale qui a, à la surface périphérique (13) de l'élément coulé, au moins une partie de faible rayon de courbure par rapport à une seconde partie adjacente,
comprenant un dispositif (11; 11') destiné à créer un champ de forces électromagnétiques qui met en forme le métal ou alliage fondu (19) coulé vers le bas, et un dispositif (12; 12'; 12") destiné à appliquer un fluide de refroidissement à la surface périphérique (13) de l'élément coulé par un ou plusieurs orifices (17; 28) d'évacuation de fluide de refroidissement,
caractérisé en ce que le dispositif (12; 12'; 12") d'application du fluide de refroidissement n'a pas d'orifices d'éracuation (17; 28) en face de la première partie.
6. Appareil de mise électromagnétique de métaux ou alliages fondus (19) sous forme d'un élément coulé (20) ayant une section transversale qui a, à la surface périphérique (13) de l'élément coulé, au moins une première partie de petit rayon de courbure par rapport à une seconde partie adjacente,
comprenant un dispositif (11, 11') destiné à créer un champ de forces électromagnétiques qui met en forme le métal ou alliage fondu (19) coulé vers le bas, et un dispositif (12; 12'; 12") destiné à appliquer un fluide de refroidissement à la surface périphérique (13) de l'élément coulé par un ou plusieurs orifices (17; 28) d'évacuation de fluide de refroidissement,
caractérisé en ce que, en face de la première partie, un ou plusieurs orifices d'évacuation (17; 28) ou une partie d'un orifice d'évacuation (28) en forme de fente sont bouchés.
7. Appareil selon l'une quelconque des revendications 3 à 6, caractérisé en ce que le dispositif (12; 12'; 12") destiné à appliquer un fluide de refroidissement est associé au dispositif (11; 11') destiné à créer un champ de forces électromagnétiques.
8. Appareil selon l'une quelconque des revendications 3 à 7, caractérisé en ce que l'orifice ou les orifices d'évacuation (17; 28) sont formé dans un collecteur de fluide de refroidissement.
9. Collecteur de fluide de refroidissement destiné à être utilisé pour la mise électromagnétique de métaux ou alliages fondus (19) sous forme d'une élément coulé (20) ayant une section transversale qui a, à la surface périphérique (13) de l'élément coulé, au moins une première partie de faible rayon de courbure par rapport à une seconde partie, le collecteur (12; 12'; 12") en forme de boucle comprenant un ou plusieurs orifices (17; 28) d'évacuation de fluide de refroidissement destinés à appliquer un fluide de refroidissement à la surface périphérique (13) de l'élément coulé, caractérisé en ce que, dans au moins une zone d'un coin du collecteur (12; 12'; 12") associée à la première partie de la surface périphérique (13) de l'élément coulé l'orifice ou les orifices d'évacuation (17; 28) sont disposés à un niveau inférieur et/ou sont dirigés vers le bas avec une plus grande inclinaison et/ou sont modifiés afin qu'il donnent (ensemble) une plus faible section d'écoulement local du fluide de refroidissement que dans une zone adjacente du collecteur (12; 12'; 12").
10. Collecteur de fluide de refroidissement selon la revendication 9, caractérisé en ce que la densité des orifices d'évacuation (17; 28) est plus faible dans la zone du coin que dans la zoneadja- cente.
11. Collecteur de fluide de refroidissement destiné à être utilisé pour la mise électromagnétique de métaux ou alliages fondus (19) sous forme d'un élément coulé (20) ayant une section transversale qui a, à la surface périphérique (13) de l'élément coulé au moins une première partie de faible rayon de courbure par rapport à une seconde partie, le collecteur (12; 12'; 12") en forme de boucle comprenant un ou plusieurs orifices (17, 28) d'évacuation de fluide de refroidissement destinés à appliquer un fluide de refroidissement à la surface périphérique (13) de l'élément coulé, caractérisé en ce qu'aucun orifice (17; 28) d'évacuation en fonctionnement n'est disposé dans la zone du coin, en association avec ladite au moins une partie en vue de son évacuation sur celle-ci.
12. Collecteur de fluide de refroidissement destiné à être utilisé dans la mise électromagnétique de métaux ou alliages fondus (19) sous forme d'un élément coulé (20) ayant une section transversale qui a, à la surface périphérique (13) de l'élément coulé, au moins une première partie de faible rayon de courbure par rapport à une seconde partie, le collecteur (12; 12'; 12") en forme de boucle comprenant un ou plusieurs orifices (17; 28) d'évacuation de fluide de refroidissement destinés à appliquer un fluide de refroidissement à la surface périphérique (13) de l'élément coulé, caractérisé en ce qu'un ou plusieurs orifices d'évacuation (17; 28) ou une partie d'un orifice d'évacuation (28) en forme de fente sont bouchés dans la zone du coin.
EP80103976A 1979-07-11 1980-07-10 Procédé et dispositif pour le moulage électromagnétique de métaux liquides ou d'alliages, installation réfrigérante pour la coulée électromagnétique Expired EP0022566B1 (fr)

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Application Number Priority Date Filing Date Title
US5677379A 1979-07-11 1979-07-11
US56773 1979-07-11

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EP0022566A1 EP0022566A1 (fr) 1981-01-21
EP0022566B1 true EP0022566B1 (fr) 1986-01-08

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EP (1) EP0022566B1 (fr)
JP (1) JPS5614056A (fr)
CA (1) CA1161107A (fr)
DE (1) DE3071333D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1192372A (fr) * 1981-06-26 1985-08-27 Michael J. Pryor Systeme de controle a priorites pour la coulee electromagnetique
CN107243609A (zh) * 2017-06-16 2017-10-13 浙江天宁合金材料有限公司 一种铜及铜合金浇铸结晶器

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985179A (en) * 1975-07-28 1976-10-21 Kaiser Aluminum & Chemical Corporation Electromagnetic casting apparatus

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467166A (en) * 1967-03-01 1969-09-16 Getselev Zinovy N Method of continuous and semicontinuous casting of metals and a plant for same
US3646988A (en) * 1970-05-20 1972-03-07 Getselev Zinovy N Induction apparatus for continuous and semicontinuous casting
US4014379A (en) * 1970-06-09 1977-03-29 Getselev Zinovy N Method of forming ingot in process of continuous and semi-continuous casting of metals
AU460318B2 (en) * 1971-11-10 1975-04-24 Kuibyshevsky Metallurgichesky Zavod Imerti Vi. Lenina Ingot-producing plant
US4156451A (en) * 1978-02-07 1979-05-29 Getselev Zinovy N Continuous or semi-continuous metal casting method
US4158379A (en) * 1978-07-03 1979-06-19 Olin Corporation Electromagnetic casting method and apparatus
FR2429633A1 (fr) * 1979-03-08 1980-01-25 Gi Splavov Procede de coulee continue d'un metal dans un champ electromagnetique et installation pour la mise en oeuvre dudit procede

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985179A (en) * 1975-07-28 1976-10-21 Kaiser Aluminum & Chemical Corporation Electromagnetic casting apparatus

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EP0022566A1 (fr) 1981-01-21
CA1161107A (fr) 1984-01-24
JPS5614056A (en) 1981-02-10
DE3071333D1 (en) 1986-02-20

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