EP3826787A1 - Amélioration par ultrasons de matériaux coulés par refroidissement intense et direct - Google Patents

Amélioration par ultrasons de matériaux coulés par refroidissement intense et direct

Info

Publication number
EP3826787A1
EP3826787A1 EP19841973.1A EP19841973A EP3826787A1 EP 3826787 A1 EP3826787 A1 EP 3826787A1 EP 19841973 A EP19841973 A EP 19841973A EP 3826787 A1 EP3826787 A1 EP 3826787A1
Authority
EP
European Patent Office
Prior art keywords
mold
billet
outlet
vibrational energy
sump
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.)
Granted
Application number
EP19841973.1A
Other languages
German (de)
English (en)
Other versions
EP3826787B1 (fr
EP3826787C0 (fr
EP3826787A4 (fr
Inventor
Michael Caleb Powell
Victor Frederic Rundquist
Venkata Kiran Manchiraju
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.)
Southwire Co LLC
Original Assignee
Southwire Co LLC
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 Southwire Co LLC filed Critical Southwire Co LLC
Publication of EP3826787A1 publication Critical patent/EP3826787A1/fr
Publication of EP3826787A4 publication Critical patent/EP3826787A4/fr
Application granted granted Critical
Publication of EP3826787B1 publication Critical patent/EP3826787B1/fr
Publication of EP3826787C0 publication Critical patent/EP3826787C0/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/049—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for direct chill casting, e.g. electromagnetic casting
    • 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
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/116—Refining the metal
    • B22D11/117—Refining the metal by treating with gases
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1246—Nozzles; Spray heads

Definitions

  • This invention relates to the direct chill (DC) casting of metals and metal alloys, particularly aluminum and aluminum alloys wherein a homogeneous product suitable to form metal products such as sheet and plate articles is directly obtained.
  • Metals and metal alloys are cast from a molten phase to produce ingots or billets that are subsequently subjected to further processing such as rolling or hot working to produce sheet or plate articles which may be converted to final products.
  • a billet will be used to describe the product of the DC casting process.
  • a billet represents an elongated metal casting product, usually cylindrical in shape, and having a small diameter in comparison to its length.
  • DC casting to produce billets or ingots is conventionally carried out in a shallow, open-ended, axially vertical mold which is initially closed at its lower end by a downwardly movable platform (often referred to as a bottom block).
  • FIG. 1 shows a schematic cross-section of an example of a conventional vertical DC caster 10. Molten metal 12 is introduced into a vertically orientated water-cooled open-ended mold 14 through a mold inlet 15 and emerges as a billet 16 from a mold outlet 17.
  • the upper part of the billet 16 has a molten metal core 24 forming an inwardly tapering sump 19 within a solid outer shell 26 that thickens at increasing distance from the mold outlet 17 as the billet cools, until a completely solid cast billet is formed at a certain distance below the mold outlet 17.
  • the mold 14 which has liquid-cooled mold walls (casting surfaces) due to liquid coolant flowing through a surrounding cooling jacket, which provides cooling of the molten metal, peripherally confines and cools the molten metal to commence the formation of the solid shell 26, and the cooling metal moves out and away from the mold through the mold outlet 17 in a direction of advancement indicated by arrow A.
  • Jets 18 of coolant liquid are directed from the cooling jacket onto the outer surface of the billet 16 as it emerges from the mold in order to provide direct cooling that thickens the shell 26 and enhances the cooling process.
  • the coolant liquid is normally water, but other appropriate fluids may be employed for specialized alloys.
  • a stationary annular wiper 20 of the same shape as the billet may be provided in contact with the outer surface of the billet spaced at a distance X below the outlet 17 of the mold and this has the effect of removing coolant liquid (represented by streams 22) from the billet surface so that the surface of the part of the billet below the wiper is free of coolant liquid as the billet advances further.
  • the billet emerging from the lower (output) end of the mold in vertical DC casting is externally solid but is still molten in its central core.
  • the pool of molten metal within the mold extends downwardly into the central portion of the downwardly-moving ingot for some distance below the mold as a sump of molten metal.
  • This sump has a progressively decreasing cross-section in the downward direction as the ingot solidifies inwardly from the outer surface until its core portion becomes completely solid.
  • Direct chill cast billets produced in this way are generally subjected to hot and cold rolling steps, or other hot-working procedures, in order to produce articles of desired form.
  • a homogenization treatment is conventionally necessary in order to convert the metal to a more usable form.
  • the metal phase is nucleating in grains which may be cellular, dendritic or a combination thereof and conventionally chemical grain refining chemicals are added to assist this process. Such chemicals add cost and create problems in operation and even may adversely affect the properties of the final product.
  • alloy components may be rejected from the forming grains and are concentrated in pockets in the microstructure, thus also adversely affecting the performance properties of the product.
  • the result of these events is compositional variances across not only the grain but also in the regions adjacent to the intermetallic phases where relatively soft and hard regions co-exist in the structure and, if not modified or transformed, will create property variances unacceptable to the final product.
  • Homogenization conventionally involves heat treatment to correct the microscopic deficiencies described above in the cast microstructure. Homogenization involves heating the cast billet to an elevated temperature (generally a temperature above a transition temperature, e.g. a temperature close to the liquidus temperature of the aluminum or aluminum alloy for from a few hours to as many 24 hours or even longer. As a result of the homogenation treatment grain distribution becomes more uniform. Further, low melting point constituent particles that may have formed during casting are dissolved back into the grains. Additionally, any large intermetallic particles that formed during casting may be fractured. Finally, precipitates of chemical additives for the purpose of strengthening the material which may have formed are dissolved and then evenly redistributed as the billet cools.
  • the homogenation operation is a high energy consumption operation and has a direct cost effect on the operation in consideration of the present high cost of energy.
  • DC direct chill
  • applying vibrational energy to the solid outer shell of the billet in the region of the tapering sump includes applying the vibrational energy from a plurality of vibrational energy sources located in a plurality of positions around the
  • applying ultrasound vibrational energy to the solid outer shell of the billet in the region of the tapering sump includes applying the vibrational energy through a layer of coolant sprayed on the outer surface of the billet beyond the outlet of the mold.
  • the direct chill mold is a vertical DC mold. In another aspect of the first embodiment, the direct chill mold is a horizontal DC mold.
  • the present invention provides a direct chill (DC) casting mold, comprising:
  • a vertically oriented open-ended mold having an upper positioned inlet and lower positioned outlet;
  • a feed trough for supply of a fluid melt to the upper inlet of the mold
  • a liquid cooling system providing a fluid cooling jacket at the outlet of the mold; a vibrational energy source positioned vertically above the mold inlet and extending into the mold;
  • a purge gas feed unit positioned vertically above the mold inlet and extending into the mold
  • the vertical position of the circumferentially arranged plurality of vibrational energy sources is located in close proximity of the mold outlet such that the vibrational energy is applied to a billet exiting the mold in a region of an inwardly tapering melt sump within the billet.
  • the vertically positioned vibrational energy source comprises at least one ultrasonic transducer, at least one mechanically-driven vibrator, or a combination thereof.
  • the vertically positioned vibrational energy source and the purge gas feed unit are combined as an ultrasonic degasser unit wherein the ultrasonic degasser comprises: an elongated probe comprising a first end and a second end, the first end attached to an ultrasonic transducer and the second end comprising a tip located at the outlet of the mold, and a purging gas delivery comprising a purging gas inlet and a purging gas outlet, the purging gas outlet disposed at the tip of the elongated probe for introducing a purging gas into the region at the outlet of the mold.
  • the ultrasonic degasser comprises: an elongated probe comprising a first end and a second end, the first end attached to an ultrasonic transducer and the second end comprising a tip located at the outlet of the mold, and a purging gas delivery comprising a purging gas inlet and a purging gas outlet, the purging gas outlet disposed at the tip of the elongated probe for introducing a purging gas
  • each of the plurality of vibrational energy sources circumferentially arranged beneath the outlet of the mold comprise at least one ultrasonic transducer, at least one mechanically-driven vibrator, or a combination thereof.
  • each of the plurality of vibrational energy sources circumferentially arranged beneath the outlet of the mold are positioned to directly contact a solid surface of a billet exiting the mold.
  • each of the plurality of vibrational energy sources circumferentially arranged beneath the outlet of the mold are positioned to contact a cooling fluid jacket on a solid surface of a billet exiting the mold.
  • the present invention provides a direct chill (DC) casting mold, comprising: a horizontally oriented open-ended mold having an inlet and outlet;
  • DC direct chill
  • a feed trough for supply of a fluid melt to the inlet of the mold
  • liquid cooling system providing a fluid cooling jacket at the outlet of the mold
  • vibrational energy source positioned at the mold inlet and extending into the mold; a purge gas feed unit positioned at the mold inlet and extending into the mold; and a plurality of vibrational energy sources circumferentially arranged beyond the outlet of the mold;
  • the position of the circumferentially arranged plurality of vibrational energy sources is located in close proximity of the mold outlet such that the vibrational energy is applied to a billet exiting the mold in a region of an inwardly tapering melt sump within the billet.
  • the vibrational energy source positioned at the mold inlet comprises at least one ultrasonic transducer, at least one mechanically-driven vibrator, or a combination thereof.
  • the vibrational energy source positioned at the mold inlet and the purge gas feed unit are combined as an ultrasonic degasser unit wherein the ultrasonic degasser comprises: an elongated probe comprising a first end and a second end, the first end attached to an ultrasonic transducer and the second end comprising a tip located at the outlet of the mold, and a purging gas delivery comprising a purging gas inlet and a purging gas outlet, the purging gas outlet disposed at the tip of the elongated probe for introducing a purging gas into the region at the outlet of the mold.
  • the ultrasonic degasser comprises: an elongated probe comprising a first end and a second end, the first end attached to an ultrasonic transducer and the second end comprising a tip located at the outlet of the mold, and a purging gas delivery comprising a purging gas inlet and a purging gas outlet, the purging gas outlet disposed at the tip of the elongated probe for introducing a
  • each of the plurality of vibrational energy sources circumferentially arranged betond the outlet of the mold comprise at least one ultrasonic transducer, at least one mechanically-driven vibrator, or a combination thereof.
  • each of the plurality of vibrational energy sources circumferentially arranged beyond the outlet of the mold are positioned to directly contact a solid surface of a billet exiting the mold.
  • each of the plurality of vibrational energy sources circumferentially arranged beyond the outlet of the mold are positioned to contact a cooling fluid jacket on a solid surface of a billet exiting the mold.
  • the present invention provides a metal or metal alloy billet obtained by the method of the first embodiment wherein the billet does not comprise a grain refining chemical and the billet has not been subjected to a thermal homogenation treatment.
  • the billet is an aluminum or aluminum alloy billet.
  • Fig. 1 shows a schematic diagram of a conventional direct chill (DC) mold casting unit and is labelled as“Prior art.”
  • Fig. 2 shows a visual concept of a standard DC casting system and is labelled as“Prior art.”
  • Fig. 3 show an open interior view of the standard DC casting system of Fig. 2 and is labelled as“Prior art.”
  • Fig. 4 shows a visual concept of a DC casting system according to one embodiment of the invention.
  • Fig. 5 shows an open interior view of the DC casting system shown in Fig. 4.
  • the gist of the embodiments described may not be limited to aluminum alloy and may be equally applicable to any metal or metal alloy cast in a DC casting operation. Further, although billets are described in the embodiments, the method may also be considered applicable to the casting of ingots. Thus, according to the present method
  • a combination of ultrasonic energy and/or purge gas is directly inserted into the melt sump of a billet formed in an open mold of a DC casting system at a point where the billet is outside the outlet of the mold.
  • This combination of vibrational energy and purge gas serves to evenly distribute the alloying elements in the melt sump region and to remove entrapped gases in the melt. Additionally, it is believed that grain refining also results from this direct application of vibrational energy into the melt sump region. Because this melt sump area is adjacent to the solidification boundary of the cooling billet, the even distribution of the alloying elements may be retained in the solidified billet.
  • the present invention provides a method for direct chill (DC) casting of a metal or metal alloy, comprising:
  • a fluid melt comprising a molten metal or molten metal alloy to a direct chill mold having an inlet and an outlet;
  • the DC casting mold may be vertically or horizontally oriented.
  • the preparation and supply of the fluid melt of the molten metal or metal alloy is conventionally known and any of the known systems may be employed with the present invention. Further, handling of the solidified billet is also conventionally known and any such systems may be suitably combined with the present invention.
  • the application of the ultrasound vibrational energy to the solid outer shell of the billet in the region of the tapering sump includes applying the vibrational energy from a plurality of vibrational energy sources located in a plurality of positions around the circumference of the billet.
  • the maximum number may be limited by the spacial configuration of the DC molding unit.
  • at least two vibrational energy sources may be employed, preferably 2 to 8 vibrational energy sources, more preferably 3 to 6 and most preferably 4 vibrational energy devices may be employed.
  • the purge gas may be any gas suitable for use with molten metal or molten metal alloy. Generally, an inert gas such as nitrogen or argon is preferred. However, in specific applications other gases may be employed as the purge gas, including combinations of gases.
  • the vibrational energy source positioned in the mold and the purge gas feed unit are combined as an ultrasonic degasser unit wherein the ultrasonic degasser comprises: an elongated probe comprising a first end and a second end, the first end attached to a ultrasonic transducer and the second end comprising a tip located at the outlet of the mold, and a purging gas delivery comprising a purging gas inlet and a purging gas outlet, the purging gas outlet disposed at the tip of the elongated probe for introducing a purging gas into the region at the outlet of the mold.
  • the billet below or beyond the mold outlet is coated with a coolant jacket, preferably a jacket of water.
  • a coolant jacket preferably a jacket of water.
  • the vibrational energy source may be inserted through the coolant jacket and directly contact the billet surface.
  • the vibrational energy source contacts the water jacket and the ultrasound energy is conveyed by the coolant to the billet surface.
  • the position of the vibrational energy device relative to the tapering sump may be located close to the mold outlet where the thickness of the solid wall is minimal.
  • the positioning of the plurality of the vibrational energy devices may be arranged at differing locations of the sump such that the ultrasound energy is applied across a maximum area of the solidification front.
  • the vibrational energy device may be any such device suitable for utilization in the DC casting mold as described.
  • a broad range of powers and ultrasonic frequencies can be used with the DC casting method as described herein and may be adjusted for optimal performance depending upon the particular alloy being cast and the depth, shape and dimensions of the mold.
  • the source of ultrasonic vibrations may provide a power of 1.5 kW at an acoustic frequency of 20 kHz.
  • the power of the probe may range between 50 and 5000 W depending on the dimensions of the probe. These powers are typically applied to the probe to ensure that the power density at the end of the probe is higher than 100 W/cm 2 , which may be considered the threshold for grain cleavage at the solidification front.
  • the powers at this area can range from 50 to 5000 W, 100 to 3000 W, 500 to 2000 W, 1000 to 1500 W or any intermediate or overlapping range. Higher powers for larger probes and lower powers for smaller probes are possible.
  • the applied vibrational energy power density can range from 10 W/cm 2 to 500 W/cm 2 , or 20 W/cm 2 to 400 W/cm 2 , or 30 W/cm 2 to 300 W/cm 2 , or 50 W/cm 2 to 200 W/cm 2 , or 70 W/cm 2 to 150 W/cm 2 , or any intermediate or overlapping ranges thereof.
  • a frequency of from 5 to 400 kHz may be used.
  • 10 and 30 kHz may be used.
  • 15 and 25 kHz may be used.
  • the frequency applied can range from 5 to 400 KHz, 10 to 30 kHz, 15 to 25 kHz, 10 to 200 KHz, or 50 to 100 kHz or any intermediate or overlapping ranges thereof.
  • the vibrational energy device may be any of such devices known in the art and may be an ultrasonic wave probe (or sonotrode), a piezoelectric transducer, an ultrasonic radiator, or a magnetostrictive element.
  • an ultrasonic transducer may be preferred.
  • ultrasonic energy is supplied from a transducer that is capable of converting electrical currents to mechanical energy thus creating vibrational frequencies above 20 kHz (e.g., up to 400 kHz), with the ultrasonic energy being supplied from either or both piezoelectric elements or
  • a separation distance from a tip of the ultrasonic wave probe to the solid billet wall may be variable.
  • the separation distance may be for example less than 1 mm, less than 2 mm, less than 5 mm, less than 1 cm, less than 2 cm, less than 5 cm, less than 10 cm, less than 20, or less than 50 cm.
  • the vibrational energy device may be a piezoelectric transducer formed of a ceramic material that is sandwiched between electrodes which provide attachment points for electrical contact. Once a voltage is applied to the ceramic through the electrodes, the ceramic expands and contracts at ultrasonic frequencies.
  • an ultrasonic booster may be used to amplify or intensify the vibrational energy created by a piezoelectric transducer.
  • the booster does not increase or decrease the frequency of the vibrations; it increases the amplitude of the vibration.
  • a booster connects between the piezoelectric transducer and the probe.
  • Magnetostrictive transducers are typically composed of a large number of material plates that will expand and contract once an electromagnetic field is applied. More specifically, magnetostrictive transducers suitable for the present invention can include in one embodiment a large number of nickel (or other magnetostrictive material) plates or laminations arranged in parallel with one edge of each laminate attached to the bottom of a process container or other surface to be vibrated.
  • a coil of wire is placed around the magnetostrictive material to provide the magnetic field.
  • a magnetic field is created. This magnetic field causes the magnetostrictive material to contract or elongate, thereby introducing a sound wave into a fluid in contact with the expanding and contracting magnetostrictive material.
  • Typical ultrasonic frequencies from magnetostrictive transducers suitable for the invention range from 20 to 200 kHz. Higher or lower frequencies can be used depending on the natural frequency of the magnetostrictive element.
  • nickel is one of the most commonly used materials. When a voltage is applied to the transducer, the nickel material expands and contracts at ultrasonic frequencies.
  • the nickel plates are directly silver brazed to a stainless steel plate.
  • the stainless steel plate of the magnetostrictive transducer is the surface that is vibrating at ultrasonic frequencies and is the surface (or probe) coupled directly to the cooling medium. The cavitations that are produced in the cooling medium via the plate vibrating at ultrasonic frequencies, then impact the solid surface of the billet.
  • Mechanical vibrators useful for the invention can operate from 8,000 to 15,000 vibrations per minute, although higher and lower frequencies can be used.
  • the vibrational mechanism is configured to vibrate between 565 and 5,000 vibrations per second.
  • ranges suitable for the mechanical vibrations that may be used in the invention include: 0 to 10 KHz, 10 Hz to 4000 Hz, 20 Hz to 2000 Hz, 40 Hz to 1000 Hz, 100 Hz to 500 Hz, and intermediate and combined ranges thereof, including a preferred range of 565 to 5,000 Hz.
  • the invention is not so limited to one or the other of these ranges, but can be used for a broad spectrum of vibrational energy up to 400 KHz including single frequency and multiple frequency sources. Additionally, a combination of sources (ultrasonic and mechanically driven sources, or different ultrasonic sources, or different mechanically driven sources or acoustic energy sources to be described below) may be used.
  • the present invention provides a direct chill (DC) casting mold, comprising:
  • a vertically oriented open-ended mold having an upper positioned inlet and lower positioned outlet;
  • a feed trough for supply of a fluid melt to the upper inlet of the mold
  • liquid cooling system providing a fluid cooling jacket at the outlet of the mold
  • a vibrational energy source positioned vertically above the mold inlet and extending into the mold
  • a purge gas feed unit positioned vertically above the mold inlet and extending into the mold;
  • the vertical position of the circumferentially arranged plurality of vibrational energy sources is located in close proximity of the mold outlet such that the vibrational energy is applied to a billet exiting the mold in a region of an inwardly tapering melt sump within the billet.
  • the mold may be constructed of any material compatible with the molten metal composition to be cast. Generally, the mold may be constructed of copper or graphite.
  • the vertically positioned vibrational energy source comprises at least one ultrasonic transducer, at least one mechanically-driven vibrator, or a combination thereof.
  • the vertically positioned vibrational energy source and the purge gas feed unit are combined as an ultrasonic degasser unit wherein the ultrasonic degasser comprises: an elongated probe comprising a first end and a second end, the first end attached to an ultrasonic transducer and the second end comprising a tip located at the outlet of the mold, and a purging gas delivery comprising a purging gas inlet and a purging gas outlet, the purging gas outlet disposed at the tip of the elongated probe for introducing a purging gas into the region at the outlet of the mold.
  • the ultrasonic degasser comprises: an elongated probe comprising a first end and a second end, the first end attached to an ultrasonic transducer and the second end comprising a tip located at the outlet of the mold, and a purging gas delivery comprising a purging gas inlet and a purging gas outlet, the purging gas outlet disposed at the tip of the elongated probe for introducing a purging gas
  • FIG. 4 A schematic visual concept of the DC casting mold system is shown in Fig. 4 where an ultrasonic degasser unit is positioned vertically above the mold and projects to a point below the mold outlet (Fig. 5).
  • Four ultrasound devices are symmetrically positioned about the circumference of the billet directly below the mold outlet and adjacent to the region of the billet containing the inwardly tapering melt sump.
  • each of the plurality of vibrational energy sources circumferentially arranged beneath the outlet of the mold comprise at least one ultrasonic transducer, at least one mechanically-driven vibrator, or a combination thereof. Further, each of the plurality of vibrational energy sources circumferentially arranged beneath the outlet of the mold may be positioned to directly contact a solid surface of a billet exiting the mold. In another aspect as shown in Figs. 4 and 5 each of the plurality of vibrational energy sources
  • the cooling jacket is a water jacket.
  • the present invention provides a direct chill (DC) casting mold, comprising:
  • a horizontally oriented open-ended mold having an inlet and an outlet
  • a feed trough for supply of a fluid melt to the inlet of the mold
  • liquid cooling system providing a fluid cooling jacket at the outlet of the mold
  • a vibrational energy source positioned at the mold inlet and extending into the mold; optionally, a purge gas feed unit positioned at the mold inlet and extending into the mold; and
  • the position of the circumferentially arranged plurality of vibrational energy sources is located in close proximity of the mold outlet such that the vibrational energy is applied to a billet exiting the mold in a region of an inwardly tapering melt sump within the billet.
  • the mold may be constructed of any material compatible with the molten metal composition to be cast. Generally, the mold may be constructed of copper or graphite.
  • the vibrational energy source positioned within the mold comprises at least one ultrasonic transducer, at least one mechanically-driven vibrator, or a combination thereof.
  • the vibrational energy source positioned within the mold and the purge gas feed unit are combined as an ultrasonic degasser unit wherein the ultrasonic degasser comprises: an elongated probe comprising a first end and a second end, the first end attached to an ultrasonic transducer and the second end comprising a tip located at the outlet of the mold, and a purging gas delivery comprising a purging gas inlet and a purging gas outlet, the purging gas outlet disposed at the tip of the elongated probe for introducing a purging gas into the region at the outlet of the mold.
  • the ultrasonic degasser comprises: an elongated probe comprising a first end and a second end, the first end attached to an ultrasonic transducer and the second end comprising a tip located at the outlet of the mold, and a purging gas delivery comprising a purging gas inlet and a purging gas outlet, the purging gas outlet disposed at the tip of the elongated probe for introducing a purging
  • the present invention is drawn to a cast alloy billet obtained by the method of the present invention.
  • the billet does not comprise a grain refining chemical, or a significantly reduced quantity of grain refining chemical, and the billet has not been subjected to a thermal homogenization treatment.
  • the billet is an aluminum or aluminum alloy billet.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention concerne un procédé et un appareil pour le coulage de métaux et d'alliages métalliques par refroidissement intense et direct, ledit procédé comprenant l'application d'énergie vibratoire au matériau fondu dans un moule à extrémité ouverte et à la sortie du moule. Selon un aspect, le procédé est destiné à la production d'alliages d'aluminium coulés.
EP19841973.1A 2018-07-25 2019-07-25 Amélioration par ultrasons de matériaux coulés par refroidissement intense et direct Active EP3826787B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201862703035P 2018-07-25 2018-07-25
PCT/US2019/043445 WO2020023751A1 (fr) 2018-07-25 2019-07-25 Amélioration par ultrasons de matériaux coulés par refroidissement intense et direct

Publications (4)

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EP3826787A1 true EP3826787A1 (fr) 2021-06-02
EP3826787A4 EP3826787A4 (fr) 2022-03-30
EP3826787B1 EP3826787B1 (fr) 2024-02-21
EP3826787C0 EP3826787C0 (fr) 2024-02-21

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US (1) US20210316357A1 (fr)
EP (1) EP3826787B1 (fr)
JP (1) JP7457691B2 (fr)
CN (2) CN118002755A (fr)
AU (1) AU2019310103A1 (fr)
BR (1) BR112021001244A2 (fr)
CA (1) CA3107465A1 (fr)
ES (1) ES2974279T3 (fr)
MX (1) MX2021000918A (fr)
WO (1) WO2020023751A1 (fr)

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US9629003B2 (en) 2013-10-07 2017-04-18 Samsung Electronics Co., Ltd. Computing system with factor estimation mechanism and method of operation thereof

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JP7457691B2 (ja) 2024-03-28
JP2021532988A (ja) 2021-12-02
US20210316357A1 (en) 2021-10-14
AU2019310103A1 (en) 2021-02-18
EP3826787C0 (fr) 2024-02-21
BR112021001244A2 (pt) 2021-04-27
KR20210037699A (ko) 2021-04-06
CA3107465A1 (fr) 2020-01-30
EP3826787A4 (fr) 2022-03-30
ES2974279T3 (es) 2024-06-26
WO2020023751A8 (fr) 2020-12-17
MX2021000918A (es) 2021-06-23
CN112703073B (zh) 2024-02-06

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