EP1195210A2 - Procédé et dispositif pour la coulée continue à refroidissement direct - Google Patents

Procédé et dispositif pour la coulée continue à refroidissement direct Download PDF

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Publication number
EP1195210A2
EP1195210A2 EP01308552A EP01308552A EP1195210A2 EP 1195210 A2 EP1195210 A2 EP 1195210A2 EP 01308552 A EP01308552 A EP 01308552A EP 01308552 A EP01308552 A EP 01308552A EP 1195210 A2 EP1195210 A2 EP 1195210A2
Authority
EP
European Patent Office
Prior art keywords
mould
coolant
castpart
outlet
emerging
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Withdrawn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
EP01308552A
Other languages
German (de)
English (en)
Other versions
EP1195210A3 (fr
Inventor
Robert B. Wagstaff
Thielman Brett
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.)
Wagstaff Inc
Original Assignee
Wagstaff Inc
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 Wagstaff Inc filed Critical Wagstaff Inc
Publication of EP1195210A2 publication Critical patent/EP1195210A2/fr
Publication of EP1195210A3 publication Critical patent/EP1195210A3/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Withdrawn legal-status Critical Current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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/049—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for direct chill casting, e.g. electromagnetic casting

Definitions

  • This invention relates to a system for use in a continuous cast mold in which coolant is applied to a castpart emerging from a mold cavity, and discloses a system which controls the flow of coolant back toward the mold cavity. More particularly, this invention relates to the creation of a forced gas barrier or knife, which prevents coolant from moving against the direction of the movement of the emerging castpart and back toward the mold cavity.
  • coolant While coolant is generally directed, applied or sprayed in one or more jets onto the emerging castpart, the coolant has a tendency to creep or flow back toward the mold cavity. This may be referred to as a capillary action of the coolant, as it moves, flows or creeps toward the mold cavity or mold cavity inlet.
  • the ability (or inability) to sufficiently control the flow of the coolant back toward the mold cavity has also imposed certain limitations in the utilization of other more efficient casting techniques. For example, applying the coolant at an approximate ninety degree angle to the surface of the emerging castpart may increase the efficiency of the cooling. However most coolant is applied at an angle substantially less than ninety degrees due to the inability to control or prevent the flow of the coolant back toward the mold cavity.
  • This invention utilizes a fluid, preferably a gas, even more preferably, air, to create pressure, force, and/or a barrier, baffle or knife which prevents the coolant from flowing, creeping or moving back toward the mold cavity inlet.
  • a fluid preferably a gas, even more preferably, air
  • This invention is not however limited to the fluid being a gas, but instead it may be other types of fluids such as ethylyn glycol (a non-explosive fluid).
  • control system provided by this invention will allow for an angle between the coolant stream and the metal surface of up to ninety degrees or more, including up to one hundred twenty degrees. This will allow for more efficient and effective direct-cooled metal casting.
  • references herein are generally to the continuous casting if ingot-shaped and billet-shaped castparts, this invention is certainly not limited to any particular shape or configuration of castpart, but instead applies to all such shapes, including exotic and unique shapes in addition to the more traditional billets and ingots.
  • this invention may be applied in different embodiments to differently configured continuous casting molds and devices, including vertical molds, horizontal molds, and molds at any other possible angle.
  • This invention is particularly well suited to allow continuous casting and the utilization of coolant at numerous different angles for the casting, as the invention better provides for the control and/or prevention of the movement of the fluid back toward the mold cavity.
  • This invention will be important in allowing other directional castings to be utilized without fear of the coolant moving, creeping, or flowing back toward or into the mold cavity.
  • Figure 1 is similar to Figure 10 from U.S. Patent No. 5,582,230 and illustrates a typical cross-section and schematic of the interface between the coolant discharge and the emerging castpart in a continuous casting mold.
  • Figure 1 illustrates emerging castpart 1, mold ring 2 supported within framework 3, first coolant discharge aperture 4, and second coolant discharge aperture 5.
  • first coolant discharge aperture 4 contacts the emerging castpart at or about target zone 6.
  • the coolant then typically moves in the direction the emerging castpart is moving, and also splashes as additional coolant is discharged.
  • a force is imparted on coolant away from the mold inlet, this not only includes imparting a force on the coolant, but may also include imparting a force only on a coolant vapor and/or on the coolant.
  • Figure 1 further illustrates first coolant reservoir 8 and second coolant reservoir 9 which supply the coolant for first coolant discharge aperture 4 and second coolant discharge aperture 5, respectively.
  • Figure 2 is a perspective view of one example of a mold framework 20 shaped to produce rectangular or ingot-shaped castparts or cast formats.
  • the mold outlet cavity side 21 and the mold intlet cavity side 22 of the framework are shown, and molten metal would generally be provided or made available through mold inlet cavity 21, and would exit through mold outlet cavity 22. It is generally at the mold outlet cavity 22 where coolant is sprayed on or directed to the emerging castpart.
  • the general manufacture and use of such a mold framework 20 is well known by those of ordinary skill in the art and will not be described in further detail. Furthermore, a more detailed description of such a framework is provided in U.S. Patent No. 5,582,230, which has previously been incorporated herein by reference.
  • Figure 3 is a bottom view of the example of the typical ingot-shaped mold framework as illustrated in Figure 2, and is a view from the outlet cavity side of the mold framework 20.
  • the inner perimeter 24 of the mold framework is also shown in Figure 3, and generally defining what is referred to as an ingot shape.
  • Figure 4 is an exemplary elevation view, part schematic, part cross- sectional, of a continuous casting mold which casts round or billet shaped castparts or cast formats.
  • Figure 4 illustrates one of the several other possible environments for the utilization of the invention described herein.
  • Figure 4 illustrates mold distribution trough 30 which is generally composed of refractory material and which is a distribution trough through which molten metal is provided to mold or mold framework 31.
  • Mold inlet or mold inlet cavity 32 is where molten metal is received within and by mold ring 34
  • mold outlet cavity 35 is where the emerging billet or emerging castpart exits the mold or mold cavity.
  • Outline 36 illustrates a billet-shaped castpart as it would otherwise exit the mold.
  • mold inlet or mold inlet cavity as used in the claims are intended to be used as a direction towards which it is desired to prevent the coolant from flowing, which is generally in the opposite direction of the flow of the molten metal.
  • This invention is not limited to a vertical or horizontal application, but would apply to situations where the mold is upside down from the current typical mold orientation so that the cast part is emerging in an upward direction.
  • Coolant discharge apertures 38 are also illustrated and show a relative location of the coolant discharge relative to the mold cavity 39 and mold outlet cavity 35.
  • Figure 4 illustrates a general configuration of how molten metal would be fed into the mold inlet cavity 32, proceed to mold cavity 39 surrounded by mold rings 34, and then emerging through mold outlet cavity 35, while coolant is sprayed or discharged thereon.
  • Figure 5 is an illustration of one embodiment of this invention wherein the system for preventing the flow of the coolant back toward the mold cavity is combined with a first coolant discharge aperture 50 and a second coolant discharge aperture 51.
  • the first coolant discharge aperture 50 discharges coolant 52 to contact the emerging castpart 53 on or about the target zone 54.
  • mold ring 55 Also illustrated in Figure 5 are mold ring 55, first coolant reservoir 56, and second coolant reservoir 57.
  • This invention provides a baffle fluid which is preferably a gas, and more particularly, preferably air, to impart a force on a coolant adjacent a castpart surface in a direction away from the mold inlet.
  • a baffle fluid which is preferably a gas, and more particularly, preferably air, to impart a force on a coolant adjacent a castpart surface in a direction away from the mold inlet.
  • gas is just one of the baffle fluids which may used in an embodiment of this invention, with others being equally usable within the contemplation of the invention (such as momentum bearing fluids, fluids which have an affinity to water vapor).
  • baffle fluid apertures may be located in any one of a number of different positions or components within the contemplation of the various embodiments of this invention, such as in the bottom block, in the graphite, or in a separate baffle body structure.
  • Figure 5 illustrates gas feed aperture 60 which feeds the one or more gas discharge apertures 61.
  • the discharged gas 62 (preferably air) imparts a force on the coolant and on the outer perimeter surface 53a of the emerging castpart 53 to prevent the coolant 52 from moving back toward the mold cavity. It will be appreciated by those of ordinary skill in the art that there are numerous different configurations for gas discharge apertures which would create such a gas force on the coolant 52 around the outer perimeter 53a of the castpart 53, to prevent the coolant 52 from traveling back toward the mold cavity.
  • Figure 6 is a perspective view of a short portion of an embodiment of a mold framework 70 of this invention and illustrates a plurality of gas discharge apertures 71, a plurality of first coolant discharge apertures 72, and a plurality of second coolant discharge apertures 73.
  • Figure 6 would be representative of an embodiment similar to that shown in Figure 5 and further illustrates gas discharge feed aperture 75, first coolant feed discharge aperture 76, and second coolant feed discharge aperture 77.
  • this coolant control system will be used to effectively mold exotic and non-symmetrical castparts, and the particular controls provided by this system will allow unique castpart outer perimeter shapes (and casting angles) through the placement of gas discharge apertures around the castpart outer perimeter, to prevent the coolant from traveling or flowing back toward the mold cavity.
  • Figure 7 is a cross-sectional view of the mold framework 70 shown in Figure 6 and illustrates gas discharge feed aperture 75, first coolant feed discharge aperture 76 and second coolant feed discharge aperture 77.
  • the gas discharge aperture 71, the first coolant discharge aperture 72, and the second coolant discharge aperture 73 are also illustrated in Figure 6.
  • Figure 7 also illustrates a few examples of angles at which the various discharge apertures may be with respect to the interior perimeter of the mold framework 70, which is the same approximate angle to the outer perimeter surface of the emerging castpart (which will approximately abut against the interior perimeter surface of mold framework 70).
  • Angle 78 is the angle between the gas discharge aperture 71 and the mold framework interior perimeter surface 70, and is intended to represent the angle at which the gas is discharged relative to the outer perimeter surface of the emerging castpart. As will be appreciated by those of ordinary skill in the art, angle 78 need not be any particular magnitude within the contemplation of this invention, but instead may range from zero degrees to eighty or ninety degrees, with approximately fifteen to twenty degrees being preferred.
  • Angle 79 represents the angle between the second coolant discharge aperture 73 and the outer surface of the emerging castpart
  • angle 80 represents the angle between the first coolant discharge apertures 72 and the outer perimeter surface of the emerging castpart.
  • Figure 8 is another embodiment or illustration, part cross-sectional and part schematic view, of an embodiment of this invention in which the coolant discharge aperture is at an approximate ninety (90) degree angle relative to the interior perimeter surface of the mold framework and with respect to the outer perimeter surface of the emerging castpart.
  • Figure 8 illustrates mold framework 80, coolant discharge aperture 81 approximately perpendicular to the outer perimeter surface 86 of the emerging castpart 85, gas discharge feed aperture 82, gas discharge aperture 83, coolant 84, and emerging castpart 85.
  • This invention is particularly well suited to allow the use of this more effective cooling angle (i.e. to approximately ninety (90) degrees or even one hundred five (105) degrees or beyond), and configuration to be utilized, since this invention provides for the more effective prevention of the coolant 84 moving or flowing back toward mold cavity 86.
  • this more effective cooling angle i.e. to approximately ninety (90) degrees or even one hundred five (105) degrees or beyond
  • the discharged gas 93 is shown preventing the coolant 84 from moving back toward the mold cavity 86 by imparting a force or creating a gas barrier or gas knife between the mold cavity 86 and the coolant.
  • the gas barrier is generally created around the outer perimeter surface 86 of the emerging castpart 85.
  • Figure 9 is a close-up detail of the target zone 90 where coolant stream 84 contacts emerging castpart 85.
  • Gas discharge aperture 83 discharges a stream of forced gas 93 which imparts a force on emerging castpart 85 and on the coolant 84 to prevent the coolant from creeping or flowing back toward the mold cavity.
  • Emerging castpart 85 is moving in the direction shown by arrow 87.
  • Figure 10 shows a schematic view of mold framework 100, emerging castpart 105, coolant discharge apertures 101 providing coolant discharge streams 108 which impact or contact emerging castpart 105 approximately at target zones 103.
  • gas discharge apertures 102 are provided between coolant discharge apertures 101 to more effectively impart a force on the coolant between the target zones 103. This is the preferred method of imparting a gas force on the coolant to control it and prevent it from moving back toward the mold cavity.
  • Coolant 106 is shown on emerging castpart 105 in Figure 10.
  • Figure 11 illustrates another embodiment of this invention, only wherein the gas discharge apertures 112 in the mold framework 100 provide the force or discharge gas approximately at the target zones 113. Coolant 116 is also shown on emerging castpart 115. While this is not a preferred embodiment, it is an optional one contemplated by this invention.
  • gas discharge apertures 112 may be extended or more precisely placed by using hollow pin type apertures extending from the mold framework 110.
  • Figure 12 is a perspective schematic view of the embodiment of the invention illustrated in Figure 11 and shows mold framework 120, coolant streams 121 being discharged through coolant apertures (not shown) in mold framework 120. Gas discharge apertures 123 are configured to impart the gas force at approximately the target zones 122. Coolant 125 is also shown on emerging castpart 126.
  • Figure 13 is a schematic of the configuration shown in Figure 10 of discharge coolant streams 108 being discharged from mold framework 100 and gas discharge apertures 102 being positioned between the target zones which coolant streams 108 are hitting. Coolant 106 is shown on emerging castpart 105.
  • Figure 14 illustrates mold framework 150, gas discharge slit aperture 151, first coolant discharge apertures 152, second coolant discharge apertures 153, first coolant feed discharge aperture 156, second coolant feed discharge aperture 157, and gas discharge feed aperture 155.
  • Figure 14 shows an embodiment wherein a slit is used to form an air curtain or to impart the gas force instead of a plurality of individual elliptical- or circular-shaped apertures (as shown in prior embodiments).
  • the invention may be considered a baffle for use in a continuous cast mold with a mold inlet, a mold outlet and a mold outlet perimeter, the mold further providing for a coolant to be applied to a castpart emerging from the mold, the baffle preventing the flow of the coolant back toward a mold inlet, the baffle comprising: a baffle body structure; one or more baffle fluid apertures in the baffle body structure and around the mold outlet perimeter, the one or more baffle fluid apertures disposed to impart forced baffle fluid on coolant which is on or adjacent a castpart surface emerging from the mold, and in a direction away from the mold inlet.
  • the baffle body structure may be considered the graphite around the mold outlet perimeter, the bottom cover or any other structure which wholly or partially covers the mold outlet perimeter sufficiently to create the baffle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP01308552A 2000-10-06 2001-10-05 Procédé et dispositif pour la coulée continue à refroidissement direct Withdrawn EP1195210A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US68407200A 2000-10-06 2000-10-06
US684072 2000-10-06

Publications (2)

Publication Number Publication Date
EP1195210A2 true EP1195210A2 (fr) 2002-04-10
EP1195210A3 EP1195210A3 (fr) 2002-04-17

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EP01308552A Withdrawn EP1195210A3 (fr) 2000-10-06 2001-10-05 Procédé et dispositif pour la coulée continue à refroidissement direct

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EP (1) EP1195210A3 (fr)
CA (1) CA2355133A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005092540A1 (fr) 2004-02-28 2005-10-06 Wagstaff, Inc. Systeme de coulee metallique a refroidissement direct
WO2022010724A1 (fr) * 2020-07-10 2022-01-13 Wagstaff, Inc. Appareil et procédé pour motif de pulvérisation d'eau de refroidissement de coulée à refroidissement direct

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2014487B (en) * 1978-02-18 1982-06-16 British Aluminium Co Ltd Varying metal-mould contact in continous casting
GB2082950B (en) * 1980-09-02 1984-06-20 British Aluminium The Co Ltd Apparatus for direct chill casting of aluminium
JPS62220248A (ja) * 1986-03-24 1987-09-28 O C C:Kk 鋳塊の水平式連続鋳造法
NO177219C (no) * 1993-05-03 1995-08-09 Norsk Hydro As Stöpeutstyr for stöping av metall

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005092540A1 (fr) 2004-02-28 2005-10-06 Wagstaff, Inc. Systeme de coulee metallique a refroidissement direct
EP1718427B1 (fr) * 2004-02-28 2017-09-06 Wagstaff, Inc. Systeme de coulee metallique a refroidissement direct
WO2022010724A1 (fr) * 2020-07-10 2022-01-13 Wagstaff, Inc. Appareil et procédé pour motif de pulvérisation d'eau de refroidissement de coulée à refroidissement direct
US11691195B2 (en) 2020-07-10 2023-07-04 Wagstaff, Inc. System, apparatus, and method for a direct chill casting cooling water spray pattern

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Publication number Publication date
EP1195210A3 (fr) 2002-04-17
CA2355133A1 (fr) 2002-04-06

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