EP1445044A2 - Verfahren und Vorrichtung zur Herstellung breiartiger Metallschmelze - Google Patents

Verfahren und Vorrichtung zur Herstellung breiartiger Metallschmelze Download PDF

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Publication number
EP1445044A2
EP1445044A2 EP03252949A EP03252949A EP1445044A2 EP 1445044 A2 EP1445044 A2 EP 1445044A2 EP 03252949 A EP03252949 A EP 03252949A EP 03252949 A EP03252949 A EP 03252949A EP 1445044 A2 EP1445044 A2 EP 1445044A2
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EP
European Patent Office
Prior art keywords
slurry
vessel
space
slurry vessel
molten metal
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Withdrawn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
EP03252949A
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English (en)
French (fr)
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EP1445044A3 (de
Inventor
Chunpyo Hong
Jaemin Kim
Minsoo Kim
Itamura Masayuki
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.)
Chunpyo Hong
Original Assignee
Chunpyo Hong
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Filing date
Publication date
Priority claimed from KR10-2003-0013517A external-priority patent/KR100445643B1/ko
Application filed by Chunpyo Hong filed Critical Chunpyo Hong
Publication of EP1445044A2 publication Critical patent/EP1445044A2/de
Publication of EP1445044A3 publication Critical patent/EP1445044A3/de
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/007—Semi-solid pressure die casting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/12—Making non-ferrous alloys by processing in a semi-solid state, e.g. holding the alloy in the solid-liquid phase

Definitions

  • the present invention relates to a method and apparatus for manufacturing a semi-solid metallic slurry, and more particularly, to a method and apparatus for manufacturing a semi-solid metallic slurry, in a solid and liquid combined state, containing fine, uniform spherical particles.
  • Semi-solid metallic slurries refer to metallic materials in a solid and liquid combined phase for use in a rheocasting or thioxocasting process.
  • Semi-solid metallic slurries consist of spherical solid particles suspended in a liquid phase in an appropriate ratio at temperature ranges for semi-solid state, and thus, they change form easily by a small force due to their thioxotropic properties and can be cast easily like a liquid due to their high fluidity.
  • Rheocasting refers to a process of manufacturing billets or mold products from metallic slurries having a predetermined viscosity through casting or forging.
  • Thixocasting refers to a process involving reheating billets manufactured through rheocasting back into a metal slurry and casting or forging the metal slurry to manufacture final products.
  • Such rheocasting or thixocasting is more advantageous than general forming processes, such as casting or forging, using molten metal.
  • semi-solid or semi-molten slurries used in rheocasting or thixocasting have fluidity at a lower temperature than molten metal, so that the die casting temperature can be lowered in rheocasting or thixocasting, thereby ensuring an extended lifespan of the die.
  • turbulence is less likely to occur, and less air is incorporated during casting, thereby preventing formation of air pockets in final products.
  • semi-solid or semi-molten metallic slurries leads to reduced shrinkage during solidification, improved working efficiency, mechanical properties, and anti-corrosion, and lightweight products. Therefore, such semi-solid or semi-molten metallic slurries can be used as new materials in the fields of automobiles, airplanes, and electrical, electronic information communications equipment.
  • semi-solid slurries solidified from molten metal by a predetermined method are used in rheocasting, and semi-molten slurries obtained by reheating solid billets are used in thixocasting.
  • semi-solid metallic slurry means a metallic slurry in a solid and liquid combined stage at a temperature range, between the liquidus temperature and the solidus temperature of the metal, which can be manufactured by rheocasting through solidification of molten metal.
  • molten metal is stirred at a temperature of lower than the liquidus temperature while cooling, to break up dendritic structures into spherical particles suitable for rheocasting, for example, by mechanical stirring, electromagnetic stirring, gas bubbling, low-frequency, high-frequency, or electromagnetic wave vibration, electrical shock agitation, etc.
  • U.S. Patent No. 3,948,650 discloses a method and apparatus for manufacturing a liquid-solid mixture.
  • molten metal is vigorously stirred while cooled to be solidified.
  • a semi-solid metallic slurry manufacturing apparatus disclosed in this patent uses a stirrer to induce flow of the solid-liquid mixture having a predetermined viscosity to break up dendritic crystalline structures or disperse broken dendritic crystalline structures in the liquid-solid mixture.
  • dendritic crystalline structures formed during cooling are broken up and used as nuclei for spherical particles.
  • the method causes problems of low cooling rate, manufacturing time increase, uneven temperature distribution in a mixing vessel, and non-uniform crystalline structure.
  • Mechanical stirring applied in the semi-solid metallic slurry manufacturing apparatus inherently leads to non-uniform temperature distribution in the mixing vessel.
  • the apparatus is operated in a chamber, thereby making it difficult to continuously perform a subsequent process.
  • U.S. Patent No. 4,465,118 discloses a method and apparatus for manufacturing a semi-solid alloy slurry.
  • This apparatus includes a coiled electromagnetic field application unit, a cooling manifold, and a vessel, which are sequentially formed inward, wherein molten metal is continuously loaded down into the vessel, and cooling water is flowed through the cooling manifold to cool the outer wall of the vessel.
  • molten metal is injected through a top opening of the vessel and cooled by the cooling manifold, thereby resulting in a solidification zone in the vessel.
  • Cooling is sustained while a magnetic field is applied by the electromagnetic field application unit to break up dendritic crystalline structures formed in the solidification zone and to pull an ingot from the slurry through the lower end of the apparatus.
  • the basic technical idea of this method and apparatus is to break up dendritic crystalline structures after solidification by applying vibration.
  • many problems arise with this method.
  • the manufacturing apparatus since molten metal is continuously supplied to grow an ingot, it is difficult to control the state of the metal ingot and the overall process.
  • the vessel is cooled using water prior to applying an electromagnetic field, so that there is a great temperature difference between the peripheral and core regions of the vessel.
  • U. S. Patent No. 4,694,881 discloses a method for manufacturing thixotropic materials.
  • an alloy is heated to a temperature at which all metallic components of the alloy are present in a liquid phase, and the resulting molten metal is cooled to a temperature between its liquidus and solidus temperatures. Then, the molten metal is subjected to a sufficient shearing force to break dendritic structures formed during the cooling of the molten metal, so that thixotropic materials are manufactured.
  • Japanese Patent Laid-open Application No. 11-33692 discloses a method for producing a metallic slurry for rheocasting.
  • a molten metal is supplied into a vessel at a temperature near its liquidus temperature or 50°C above its liquidus temperature.
  • the molten metal is subjected to a force, for example, ultrasonic vibration.
  • the molten metal is slowly cooled into a metallic slurry for rheocasting containing spherical particles.
  • This method also uses a physical force, such as ultrasonic vibration, to break up the dendrites grown at the early stage of solidification.
  • a physical force such as ultrasonic vibration
  • Japanese Patent Laid-open Application No. 10-128516 discloses a casting method of thixotropic metal. This method involves loading a molten metal into a vessel and vibrating the molten metal using a vibrating bar dipped in the molten metal to directly transfer its vibrating force to the molten metal.
  • a molten alloy containing nuclei which is a semi-solid and semi-liquid state, at temperatures lower than its liquidus temperature is formed and cooled to a temperature at which it has a predetermined liquid fraction and held from 30 seconds to 60 minutes to allow nuclei in the molten alloy to grow larger, thereby resulting in thixotropic metal.
  • This method provides relatively large particles of about 100 ⁇ m and takes a considerably long processing time, and cannot be performed in a larger vessel than a predetermined size.
  • U.S. Patent No. 6,432,160 B1 discloses a method for making a thixotropic metal slurry. This method involves simultaneously controlling the cooling and the stirring of molten metal to form a thixotropic metal slurry.
  • a stator assembly positioned around the mixing vessel is operated to generate a magnetomotive force sufficient to stir the molten metal in the vessel rapidly.
  • the temperature of the molten metal is rapidly dropped by means of a thermal jacket equipped around the mixing vessel for precise control of the temperature of the mixing vessel and the molten metal.
  • the molten metal is continuously stirred during cooling cycle in a controlled manner. When the solid fraction of the molten metal is low, high stirring rate is provided. As the solid fraction increases, a greater magnetomotive force is applied.
  • the present invention provides a method and apparatus for manufacturing a semi-solid metallic slurry containing fine, uniform spherical particles, with improvements in energy efficiency and mechanical properties, cost reduction, convenience of casting, and shorter manufacturing time.
  • the present invention also provides a method and apparatus for manufacturing a high-quality semi-solid metallic slurry within a short time, which can be readily and conveniently applied to a subsequent process.
  • a method for manufacturing a semi-solid metallic slurry comprising: applying an electromagnetic field to a space containing a slurry vessel; loading a molten metal into the slurry vessel in a state where the electromagnetic field is applied to the space; and drawing the slurry vessel out from the space.
  • applying the electromagnetic field to the space is performed prior to loading the molten metal into the slurry vessel.
  • the slurry vessel is placed in the space after applying the electromagnetic field to the space.
  • applying the electromagnetic field to the space may be performed at the start of loading the molten metal into the slurry vessel.
  • applying the electromagnetic field to the space may be performed in the middle of loading the molten metal into the slurry vessel.
  • applying the electromagnetic field to the space may be sustained until a slurry in the slurry vessel has a solid fraction of 0.001-0.7, preferably, 0.001-0.4, more preferably, 0.001-0.1.
  • the method for manufacturing a semi-solid metallic slurry may further comprising cooling the slurry vessel containing the molten metal after loading the molten metal into the slurry vessel.
  • cooling the slurry vessel containing the molten metal is sustained until a slurry in the slurry vessel has a solid fraction of 0.1-0.7.
  • Cooling the slurry vessel containing the molten metal may be performed at a rate of 0.2-5.0°C/sec, preferably, 0.2-2.0°C/sec.
  • an apparatus for manufacturing a semi-solid metallic slurry comprising: at least one slurry vessel; at least one stirring unit which includes a space for the at least one slurry vessel and applies an electromagnetic field to the space; a driving unit which moves the slurry vessel at least up and down to place the slurry vessel in the space; and a loading unit via which a molten metal in liquid state is loaded into the slurry vessel.
  • the at least one stirring unit applies the electromagnetic field to the space prior to loading the molten metal into the at least one slurry vessel.
  • the at least one stirring unit applies the electromagnetic field to the space at the start of loading the molten metal into the at least one slurry vessel.
  • the at least one stirring unit applies the electromagnetic field to the space in the middle of loading the molten metal into the at least one slurry vessel.
  • the driving unit may move the slurry vessel up after a predetermined period of time from loading the molten metal into the at least one slurry vessel to draw the at least one slurry vessel out from the space.
  • the driving unit may laterally shift the at least one slurry vessel.
  • the driving unit may comprise a rotary plate which supports the at least one slurry vessel at its edge. The driving unit with the rotary plate moves the at least one slurry vessel down after a predetermined period of time from loading the molten metal into the at least one slurry vessel and rotates the rotary plate to draw the at least one slurry vessel out from the space.
  • the driving unit may be constructed to be laterally moveable along a rail, so that it moves the at least one slurry vessel down after a predetermined period of time from loading the molten metal into the at least one slurry vessel and is moved along the rail to draw the at least one slurry vessel out from the space.
  • the at least one stirring unit applies the electromagnetic file to the space until a slurry in the at least one slurry vessel has a solid fraction of 0.001-0.7, preferably, 0.001-0.4, more preferably, 0.001-0.1.
  • the at least one slurry vessel used in the semi-solid metallic slurry manufacturing apparatus may include a temperature control element.
  • This temperature control element may comprise at least one of a cooler installed in the at least one slurry vessel and an external electric heater.
  • the temperature control element cools a slurry in the at least one slurry vessel to reach a solid fraction of 0.1-0.7.
  • the temperature control element cools a slurry in the at least one slurry vessel at a rate of 0.2-5.0°C/sec, preferably, 0.2-2.0°C/sec.
  • a method for manufacturing a semi-solid metallic slurry according to the present invention involves stirring molten metal by applying an electromagnetic field prior to the completion of loading the molten metal into a vessel.
  • electromagnetic stirring is performed prior to or at the start or in the middle of loading the molten metal into the vessel, to prevent formation of dendritric structures.
  • Ultrasonic waves instead of the electromagnetic field can be applied for stirring.
  • an empty vessel is positioned in a space of a semi-solid metallic slurry manufacturing apparatus.
  • An electromagnetic field is applied to the space, and molten metal is loaded into the vessel.
  • the intensity of the applied electromagnetic field is strong enough to stir the molten metal.
  • FIG. 1 is a graph of temperature profile applied in a method for manufacturing a semi-solid metallic slurry according to the present invention.
  • molten metal is loaded into the vessel at a temperature Tp.
  • an electromagnetic field may be applied to the vessel prior to loading molten metal into the vessel.
  • the vessel may be positioned in the space after the application of an electromagnetic field into the space.
  • the present invention is not limited to this, and electromagnetic stirring may be performed at the start or in the middle of loading the molten metal into the vessel.
  • the molten metal does not grow into dendritic structures near the inner wall of the vessel at the early stage of solidification, and numerous micronuclei are concurrently generated throughout the vessel because the temperature of the entire molten metal is rapidly dropped to a temperature lower than its liquidus temperature.
  • molten metal does not solidify near the inner vessel wall at the early stage of cooling, and no latent heat of solidification is generated. Accordingly, the amount of heat to be dissipated from the molten metal for cooling is equivalent only to the specific heat of the molten metal that corresponds to about 1/400 of the latent heat of solidification. Therefore, dendrites, which are generated frequently when using conventional methods near the inner vessel wall at the early stage of cooling, are not formed, and the entire molten metal in the vessel can be uniformly cooled. It takes merely about 1-10 seconds from the loading of the molten metal. As a result, numerous nuclei are created and dispersed uniformly throughout the entire molten metal in the vessel. The increased density of nuclei shortens the distance between the nuclei, and spherical particles instead of dendritic particles are grown.
  • the present invention since the entire vessel containing the molten metal is cooled uniformly, it allows for the loading of the molten metal into the vessel at a temperature of 100°C above its liquidus temperature, without the need to cool the temperature of the molten metal to near its liquidus temperature.
  • an electromagnetic field is applied to a vessel after the completion of loading molten metal into a vessel and a portion of the molten metal reaches below its liquidus temperature. Accordingly, latent heat is generated due to the formation of solidification layers near the inner wall of the vessel at the early stage of cooling. Because the latent heat of solidification is about 400 times greater than the specific heat of the molten metal, it takes much time to drop the temperature of the entire molten metal below its liquidus temperature. Therefore, in these conventional methods, the molten metal is loaded into the vessel after the molten metal has cooled to a temperature near its liquidus temperature or to a temperature of 50°C above its liquidus temperature.
  • the electromagnetic stirring may be stopped at any point after at least a portion of the molten metal in the vessel reaches a temperature lower than its liquidus temperature T l , i.e., after nuclei are created in the molten metal at a solid fraction of about 0.001, as illustrated in FIG. 1.
  • an electromagnetic field may be applied to the molten metal in the vessel throughout all the cooling process of the molten metal, but prior to a subsequent forming process such as die casting or hot forging. This is because, once nuclei are distributed uniformly throughout the vessel, the electromagnetic stirring does not affect the growth of crystalline particles from the nuclei in the metallic slurry.
  • the electromagnetic stirring can be sustained until the solid fraction of the molten metal reaches at least 0.001-0.7.
  • the electromagnetic stirring is sustained until the solid fraction of the molten metal reaches the range of, preferably, 0.001-0.4, and more preferably, 0.001-0.1, for energy efficiency.
  • the vessel containing the metallic slurry is drawn out from the electromagnetic field application space for a continuous subsequent process, for example, die casting, hot forging, billet formation.
  • the vessel containing the metallic slurry may be drawn out from the electromagnetic field application space irrespective of the termination of the electromagnetic stirring, i.e., after or during the application of the electromagnetic field.
  • the application of an electromagnetic field performed prior to the completion of loading the molten metal into the vessel to form and uniformly distribute nuclei in the molten metal is followed by cooling to facilitate the growth of the nuclei.
  • This cooling process may be performed simultaneously to loading the molten metal into the vessel.
  • the application of the electromagnetic field may be sustained throughout all the cooling process.
  • cooling may be performed when the vessel containing the metallic slurry stays in the electromagnetic field application space, i.e., prior to the vessel being drawn out from the electromagnetic field application space.
  • a semi-solid metallic slurry is manufactured in the electromagnetic field application space and readily subjected to a following forming process.
  • the cooling process may be sustained just prior to a subsequent forming process, preferably, until the solid fraction of the molten metal reaches 0.1-0.7, i.e., up to time t 2 of FIG. 1.
  • the molten metal may be cooled at a rate of 0.2-5.0°C/sec, preferably, 0.2-2.0°C/sec depending on a desired distribution of nuclei and a desired size of particles.
  • a semi-solid metallic slurry containing a predetermined amount of solid is manufactured through the above-described processes and readily subjected to billet formation, by rapid cooling, for thixocasting or die casting, forging, or pressing to form final products.
  • a semi-solid metallic slurry can be manufactured within a short time, merely in 30-60 seconds from loading the molten metal into the vessel for a metallic slurry with a solid fraction of 0.1-0.7.
  • formed products having a uniform, dense spherical crystalline structure can be manufactured from the semi-solid metallic slurry formed by the method according to the present invention.
  • a semi-solid metallic slurry manufacturing apparatus includes a space 13 to which an electromagnetic field is applied, a stirring unit 1 equipped with a coil 11 for applying an electromagnetic field to surround the space 13, at least one slurry vessel 1 that can be accommodated in the space 13, a driving unit 3 for moving the slurry vessel 2 at least up and down, a loading unit 4 via which molten metal is loaded into the slurry vessel 2, and a controller 5.
  • the stirring unit 1 is mounted on the top of a base plate 14 having a hollow 14a.
  • the base plate 14 is installed at a predetermined height from the ground while supported by a support member 15.
  • the coil 11 for applying an electromagnetic field is mounted on the base plate 14 around the hollow 14a, while supported by a frame 12 having an inner space for the space 13.
  • the coil 11 is electrically connected to the controller 5 and applies a predetermined intensity of electromagnetic field to the space 13 to electromagnetically stir the molten metal contained in the slurry vessel 2 placed in the space 13.
  • the stirring unit 1 may be implemented as an ultrasonic stirrer.
  • the slurry vessel 2 may be formed of a metallic material or an insulating material and may have any size and any shape that can be accommodated in the space 13 surrounded by the stirring unit 1. However, it is preferable that the slurry vessel 2 is formed of a material having a higher melting point than the molten metal to be loaded thereinto.
  • the slurry vessel 2 may have a lower stepped portion 21 that fits a vessel receiver 33, to be described later, to lock the slurry vessel 2 into the space 13.
  • a thermocouple may be installed in the slurry vessel 2 and connected to the controller 5 to provide temperature information on the slurry vessel 2 to the controller 5.
  • the slurry vessel 2 may be formed with a simple structure for containing molten metal, as illustrated in FIGS. 2 and 3. However, the slurry vessel 2 may further comprise a temperature control element 20, as illustrated in FIG. 4.
  • the temperature control element 20 is comprised of a cooler and/or a heater.
  • a cooling water pipe 23 is embedded in a vessel body 22.
  • an electric heater with a heating coil may be further installed outside the slurry vessel 2.
  • the cooler may be implemented as a water jacket additionally attached outside the slurry vessel 2, instead of the cooling water pipe 23.
  • the cooler, the heater, or a combination of the two may be installed in the slurry vessel 2 to cool the molten metal contained in the slurry vessel 2 at an appropriate rate. It will be obvious that such a slurry vessel 2 can be applied to all of the following embodiments of a semi-solid metallic slurry manufacturing apparatus according to the present invention.
  • the driving unit 3 moves the slurry vessel 2 to place it in the space 13 and to draw it out from the space 13.
  • the driving unit 3 is implemented with a driving motor and a gear or a hydraulic cylinder, etc.
  • the driving unit 3 may comprise a power system 31 electrically connected to the controller 5, a piston 32 connected to and actuated by the power system 31 to move up and down in the space 13, and a vessel receiver 33 attached to an end of the piston 32 near the space 13 to support the slurry vessel 2 therein.
  • the slurry vessel 2 is placed in the space 13 to fit the vessel receiver 33.
  • the loading unit 4 supplies a molten metal in liquid state into the slurry vessel 2.
  • the loading unit 4 may be implemented with a general ladle, which is electrically connected to the controller 5. Any device for loading molten metal into the slurry vessel 2 can be used for the loading unit 4.
  • an electromagnetic field having a predetermined frequency is applied to the space 13 at a predetermined intensity by the coil 11 of the stirring unit 1.
  • the slurry vessel 2 may be placed in the space 13 after the application of the electromagnetic field to the space 13.
  • a metal molten in a separate electrical furnace is loaded via the loading unit 4 into the slurry vessel 2 under the electromagnetic field. Applying an electromagnetic field to the space 13 may be performed at the start or in the middle of loading molten metal into the vessel 2, in addition to prior to the loading, as described above.
  • the driving unit 3 is operated to raise the slurry vessel 2, as illustrated in FIG. 3, to draw the slurry vessel 2 out from the space 13 and to load another empty vessel into the space 13, for example, using a transfer unit such as a robot.
  • the slurry vessel 2 drawn out from the space 13 is subjected to cooling at a predetermined rate until the solid fraction of a resulting semi-solid metallic slurry reaches the range of 0.1-0.7.
  • the molten metal in the slurry vessel 2 may be cooled at a rate of 0.2-5.0°C/sec, preferably, 0.2-2.0°C/sec.
  • the molten metal in the slurry vessel 2 may be cooled prior to being drawn out from the space 13 by the driving unit 3. In this case, after the completion of cooling the molten metal in the slurry vessel 2, the slurry vessel 2 is drawn out from the space 13 and replaced with another empty vessel.
  • the application of an electromagnetic field to the space 13 may be sustained throughout all the cooling process, i.e., prior to drawing the slurry vessel 2 out from the space 13 by the operation of the driving unit 3, until the solid fraction of the resulting semi-solid metallic slurry reaches the range of 0.001-0.7.
  • the application of an electromagnetic field to the space 13 by the coil 11 is sustained after loading the molten metal into the vessel 2 until the solid fraction reaches, preferably, at least 0.001-0.4, more preferably, 0.001-0.1, for energy efficiency, as described above.
  • the time required for the solid fraction to reach such a level can be experimentally measured. It is obvious that cooling can be performed while the electromagnetic field is applied to the space 13, as described above.
  • a semi-solid metallic slurry manufacturing apparatus includes at least two slurry vessels 2a and 2b for simultaneous slurry formations.
  • the basic structure of the semi-solid metallic slurry manufacturing apparatus in this embodiment is the same as in the previous embodiment, and thus, a detailed description thereon will be omitted here.
  • two vessel receivers 33a and 33b for the at least two slurry vessels 2a and 2b are mounted on a receiver plate 34.
  • the height of the vessel receivers 33a and 33b is substantially equal to the height of the spaces 13a and 13b such that the slurry vessels 2a and 2b fitted into the vessel receivers 33a and 33b can be raised up to the top of the spaces 13a and 13b to be drawn out therefrom, respectively.
  • FIG. 6 illustrates a semi-solid metallic slurry manufacturing apparatus according to still another embodiment of the present invention, which differs from the previous embodiments in that the driving unit 3 is constructed to be able to laterally shift the slurry vessel 2. The following description will be focused on this difference from the previous embodiments.
  • a semi-solid metallic slurry manufacturing apparatus includes a rotary plate 35 attached to an end of the piston 32 of the driving unit 3.
  • the piston 32 is attached to nearly the center of the rotary plate 35.
  • At least two vessel receivers 33a and 33b are mounted at the edge of the rotary plate 35, and the slurry vessels 2a and 2b are fitted into the vessel receivers 33a and 33b, respectively.
  • the power system 31 is constructed to be able to move up and down and rotate the piston 32. As the rotary plate 35 is rotated by the power system 31, the vessel 2a is laterally shifted away from the space 13, as shown in FIG. 6.
  • the operation of the semi-solid metallic slurry manufacturing apparatus of FIG. 6 will be described detail with reference to FIG. 7.
  • FIG. 7 sequentially illustrates the operation of the semi-solid metallic slurry manufacturing apparatus of FIG. 6.
  • the piston 32 is raised to place the first slurry vessel 2a in the space 13, and an electromagnetic field is applied to the space 13 by the coil 11 of the stirring unit 1.
  • the first slurry vessel 21 may be placed in the space 13 after the application of an electromagnetic field.
  • molten metal is loaded into the first slurry vessel 2a from the loading unit 4 and left in the electromagnetic field for a predetermined period of time.
  • the electromagnetic field may be applied at the start or in the middle of loading the molten metal into the first slurry Bessel 2a.
  • the piston 32 is moved down to draw the first slurry vessel 2a out from the space 13.
  • the piston 32 is rotated to switch the first slurry vessel 2a and the second slurry vessel 2b, which is empty.
  • the slurry in the first slurry vessel 2a is cooled at an appropriate rate to form a semi-solid metallic slurry containing a predetermined amount of solid.
  • the piston 32 is raised again, as illustrated in (e) of FIG. 7, to repeat the above processes on the second slurry vessel 2b.
  • the first slurry vessel 2a containing the semi-solid metal is transferred by a transfer unit, such as a robot 6, for a subsequent forming process.
  • a large amount of semi-solid metallic slurry can be manufactured continuously using an apparatus according to the present invention described above with more convenience when applied to a subsequent process and enhanced overall processing efficiency.
  • the driving unit 3 may be constructed to be laterally movable along a rail 36, as shown in FIG. 8.
  • the methods and apparatuses for manufacturing a semi-solid metallic slurry according to the present invention are compatible with various kinds of metals and alloys, for example, aluminum, magnesium, zinc, copper, iron, and alloys of the forgoing metals, for rheocasting.
  • Semi-solid metallic slurries manufactured according to the present invention contain micro spherical particles of even distribution with an average diameter of 10-60 ⁇ m and provide improved mechanical properties, even for alloys. According to the present invention, such uniform spherical particles can be formed within a short time through electromagnetic stirring initiated at a temperature above the liquidus temperature of a source metal to generate more nuclei throughout the slurry vessel.
  • the overall slurry manufacturing process can be simplified, and the duration of electromagnetic stirring and forming (casting) time can be greatly shortened, thereby saving energy for the stirring and costs.
  • the semi-solid metallic slurry manufacturing apparatus according to the present invention makes it convenient to perform a subsequent process and increases the yield of formed products.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP03252949A 2002-09-25 2003-05-12 Verfahren und Vorrichtung zur Herstellung breiartiger Metallschmelze Withdrawn EP1445044A3 (de)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
KR2002058163 2002-09-25
KR20020058163 2002-09-25
KR2002063162 2002-10-16
KR20020063162 2002-10-16
KR2003003250 2003-01-17
KR20030003250 2003-01-17
KR2003013517 2003-03-04
KR10-2003-0013517A KR100445643B1 (ko) 2002-09-25 2003-03-04 반응고 금속 슬러리 제조장치

Publications (2)

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EP1445044A2 true EP1445044A2 (de) 2004-08-11
EP1445044A3 EP1445044A3 (de) 2005-11-30

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US (1) US20040055735A1 (de)
EP (1) EP1445044A3 (de)
JP (1) JP3549054B2 (de)
CN (1) CN1280044C (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006117111A1 (de) * 2005-05-04 2006-11-09 Evgenij Sterling Verfahren zum herstellen von masseln und masseln
CN104107885A (zh) * 2013-12-25 2014-10-22 南昌大学 半固态浆料洁净制备装置
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CN108588591B (zh) * 2018-05-17 2020-10-30 沈阳工业大学 机械结合电磁搅拌制备短碳纤维增强金属基复合材料方法
CN111394601A (zh) * 2020-03-25 2020-07-10 广东领胜新材料科技有限公司 一种大尺寸无铅易切削铝合金铸棒的铸造方法
CN111394601B (zh) * 2020-03-25 2021-05-25 广东领胜新材料科技有限公司 一种大尺寸无铅易切削铝合金铸棒的铸造方法

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