US20200338635A1 - Metal product manufacturing device and metal product manufacturing method - Google Patents

Metal product manufacturing device and metal product manufacturing method Download PDF

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US20200338635A1
US20200338635A1 US16/762,035 US201816762035A US2020338635A1 US 20200338635 A1 US20200338635 A1 US 20200338635A1 US 201816762035 A US201816762035 A US 201816762035A US 2020338635 A1 US2020338635 A1 US 2020338635A1
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Prior art keywords
end plate
molten metal
metal
container
state
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US16/762,035
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English (en)
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Kenzo Takahashi
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Priority claimed from PCT/JP2018/032765 external-priority patent/WO2019092962A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/02—Use of electric or magnetic effects
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/003—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals by induction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/06—Permanent moulds for shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
    • B22D23/06—Melting-down metal, e.g. metal particles, in the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D45/00—Equipment for casting, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D5/00—Machines or plants for pig or like casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5229—Manufacture of steel in electric furnaces in a direct current [DC] electric arc furnace
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to a metal product manufacturing device and a metal product manufacturing method.
  • a product of a non-ferrous metal or a product of another metal is produced by performing casting with a molten metal having a conductive property (conductivity), that is, a molten metal of a non-ferrous metal (for example, Al, Cu, Zn, Si, an alloy of at least two of these, an Mg alloy, or the like) or a molten metal of another metal other than the non-ferrous metal.
  • a molten metal having a conductive property conductivity
  • impurities are originally contained inside the scrap as a raw material. Additionally, the impurities are generated at the time of melting work of the scrap and are dissolved inside a molten metal. Therefore, it is inevitable that the impurities are contained inside the molten metal obtained by recycling the scrap.
  • the product results in containing impurities, and quality and performance of the product may be degraded. From this point, it is extremely important to remove impurities from a molten metal that uses the scrap as the raw material. Therefore, conventionally, the impurities are removed from the molten metal by various methods.
  • a filter is used to filtrate and remove the impurities contained inside the molten metal. Furthermore, flux is charged, or gas is blown into the molten metal to change the impurities into a compound, and the compound is made to float on a surface of the molten metal and then removed. Moreover, after the impurities are removed from the molten metal by the flux or the gas, the impurities are further removed from the molten metal by using a filter.
  • the impurities can also be removed from the molten metal to some extent by the method of using flux or gas as described above. However, even with this method, the impurities cannot be removed sufficiently. Furthermore, the impurities inside the molten metal cannot be removed sufficiently even by further filtrating, with a filter, the molten metal from which the impurities have been removed by using the flux or the gas.
  • the present invention is uniquely achieved by the present inventor on the basis of the above-described inventor's unique awareness of the problems, and an object of the present invention is to provide a device and a method capable of: removing impurities, with higher accuracy, from a molten metal of a non-ferrous metal or a molten metal of another metal containing the impurities; obtaining a molten metal having higher purity; and obtaining a high-purity non-metal product or another metal product from the high-purity molten metal.
  • the present inventor has previously disclosed, in Japanese Patent Nos. 5,669,504 and 5,431,438, the inventions different from the present invention.
  • the technical ideas described in these publications are directed to improving product quality more by rotationally driving a molten metal with large stirring force as quickly and surely as possible, but are not directed to removing impurities from the molten metal.
  • the present invention is a different invention having the technical idea completely different from and unrelated to the inventions of the above-described publications, and is not conceivable from the inventions of the above-described publications.
  • a metal product manufacturing device including a container that stores a molten metal having a conductive property, the metal product manufacturing device including:
  • an upper electrode fixed to the upper end plate in a state of passing through the upper end plate, and having an inner end electrically connectable to the molten metal
  • At least the upper end plate is detachable from the container body portion
  • the upper electrode is fixed to a substantially central portion of the upper end plate in the state of passing through the upper end plate in a thickness direction
  • the lower electrode is fixed to a substantially central portion of the lower end plate in the state of passing through the lower end plate in a thickness direction
  • the upper electrode and the lower electrode are located on a substantially vertical straight line in an upper-lower direction.
  • a metal product manufacturing method of manufacturing a metal product from a molten metal having a conductive property including:
  • an upper electrode fixed to the upper end plate in a state of passing through the upper end plate, and having an inner end electrically connectable to the molten metal
  • At least the upper end plate is detachable from the container body portion
  • the upper electrode is fixed to a substantially central portion of the upper end plate in the state of passing through the upper end plate in a thickness direction
  • the lower electrode is fixed to a substantially central portion of the lower end plate in the state of passing through the lower end plate in a thickness direction
  • the upper electrode and the lower electrode are located on a straight line in an upper-lower direction;
  • FIG. 1 is a schematic entire configuration diagram of a metal product manufacturing device used to implement the present invention.
  • FIG. 1A is a schematic explanatory view illustrating a form of an actual use state of the device in FIG. 1 .
  • FIG. 2 is an explanatory plan view of a container and a magnetic field device in FIG. 1 .
  • FIG. 3 is an explanatory cross-sectional view taken along a line III-III in FIG. 1 .
  • FIG. 4 is an explanatory plan view of the magnetic field device in FIG. 1 .
  • FIG. 5 is an explanatory plan view illustrating a modified example in FIG. 4 .
  • FIG. 6 is an explanatory longitudinal sectional view of the container in FIG. 1 .
  • FIG. 7 is an explanatory plan view of the container in FIG. 1 .
  • FIG. 8 is an explanatory view of a separated state of a container body and an end plate in FIG. 6 .
  • FIG. 9 is an explanatory view illustrating density of a current flowing between a pair of electrodes via a molten metal.
  • FIG. 10 is an explanatory view to describe the density of the current in FIG. 9 .
  • FIG. 11 is an explanatory view illustrating a magnetic field generated in the case of FIG. 9 .
  • FIG. 12 is an explanatory view illustrating Lorentz force generated in the case of FIG. 9 .
  • FIG. 13 is an explanatory view illustrating a pressure gradient generated inside the molten metal in the case of FIG. 9 .
  • FIG. 14 is a cross-sectional explanatory view illustrating a distribution state of impurities in a product obtained in the case of FIG. 9 .
  • FIG. 15 is an explanatory view illustrating density of a current in a case of applying the current upward from below contrary to the case of FIG. 9 .
  • FIG. 16 is an explanatory view illustrating the density of the current in FIG. 15 .
  • FIG. 17 is an explanatory view illustrating a magnetic field generated in the case of FIG. 15 .
  • FIG. 18 is an explanatory view illustrating Lorentz force generated in the case of FIG. 9 .
  • FIG. 19 is an explanatory view illustrating one mode of use in FIG. 1 and also is the explanatory view in a case of applying a current downward in a state of applying a magnetic field.
  • FIG. 20 is an explanatory view illustrating electromagnetic force (Lorentz force) generated in the case of FIG. 19 .
  • FIG. 21 is an explanatory view of electromagnetic force in a case of applying the current upward in a direction opposite to the case of FIG. 19 .
  • FIG. 22 is an end surface view of a product obtained by implementing the present invention.
  • FIG. 23 is an end surface view of a product obtained under conditions different from those of FIG. 22 .
  • FIG. 24 is an end surface view of a product obtained under conditions different from those in FIG. 22 and the like.
  • FIG. 25 is an end surface view of a product obtained under conditions different from those of FIG. 22 and the like.
  • FIG. 26 is an end surface view of a product obtained under conditions different from those of FIG. 22 and the like.
  • the present invention is provided to solve the above-described technical problem of obtaining a high-quality product from a molten metal containing impurities, that is, the problem unique to the present inventor.
  • the present invention is based on results of unique experiments repeatedly conducted by the present inventor multiple times in order to solve the technical problem, and the present invention is hardly conceivable by other engineers who are not as proactive as the present inventor in solving the above-described technical problem and have not uniquely conducted the experiments the multiple times.
  • the present inventor has continued day and night the technical research to obtain a molten metal of a non-ferrous metal or a molten metal of another ferrous metal having higher purity and suitable for producing a higher quality non-metal product and another metal product.
  • the present inventor has become uniquely eager to solve the technical problem of removing impurities from a recycled molten metal or the like containing a large amount of the impurities, regarding which other engineers have not been so proactive.
  • the present inventor has reached a technical idea as follows. That is, the present inventor has noticed that, in the process of the research, a molten metal of a non-ferrous metal or a molten metal of another ferrous metal containing impurities might be grasped as a so-called multiphase fluid. In other words, the present inventor has reached the idea that the molten metal could be grasped as the multiphase fluid including: the molten metal of the non-ferrous metal or the molten metal of another ferrous metal as a base; and a molten metal of the impurities dissolved therein.
  • the above-described multiphase fluid is a multiphase fluid in terms of Archimedes electromagnetic force
  • the multiphase fluid can be theatrically grasped as: the fluid as the base: and the fluid (particles) of the impurities dissolved therein.
  • the impurities inside the molten metal of the non-ferrous metal or the molten metal of another ferrous metal can be moved by the Archimedes electromagnetic force along a pressure gradient by adding the pressure gradient to the molten metal of the non-ferrous metal or the molten metal of another ferrous metal as the base, and consequently, it is fairly sure that the impurities can be separated from the base.
  • the present inventor has struggled and repeatedly conducted various kinds of experiments multiple times in order to confirm these points.
  • the experiments were conducted not intending to separate impurities to an upper side and a lower side as conceived by a general engineer but intending to place the impurities in a periphery of a round bar or a square bar so as to easily perform subsequent impurity removal processing, in a case of producing the round bar or the square bar of the non-ferrous metal or another ferrous metal in order to obtain a product having higher purity.
  • FIGS. 24 to 26 illustrate end surfaces of aluminum round bars (billets) obtained from the experiments by the present inventor.
  • FIGS. 21 to 26 are diagrams each illustrating distribution of impurities (Al 3 Fe) obtained from color photographs of the respective end surfaces of the products. As understood from these diagrams, the impurities (Al 3 Fe) could be gathered at a peripheral portion of a high-purity aluminum at a center portion.
  • the subsequent impurity removal processing can be performed while looking at the end surface and visually confirming removal work of the impurities, or the subsequent impurity removal processing can be performed after visually confirming and learning a place of the impurities in advance, and accordingly, the impurities can be easily and surely removed from the product.
  • the present inventor has discovered that, through the unique experiments conducted many times by himself, the impurities can be gathered at the periphery from the non-ferrous metal or another metal containing the impurities by using the Archimedes electromagnetic force.
  • the present invention is made on the basis of the discovery achieved through the unique experiments conducted by the present inventor, and is the invention that can be achieved only by the inventor who has conducted the experiments and also is the invention that cannot be achieved by other those skilled in the art who have not conducted the experiments. Particularly, it is considered that gathering the impurities at the periphery of the product instead of at the upper and lower sides thereof can be achieved only by the present inventor.
  • the metal product manufacturing device 100 includes, as illustrated in FIG. 1 , a container 1 , a magnetic field device 2 , and a power supply device 3 .
  • the container 1 is provided to store a molten metal obtained from, for example, a non-ferrous metal or another metal that is recycled, includes impurities, and has a conductive property.
  • the non-ferrous metal or another metal is a non-ferrous metal of a conductor (electric conductor) of Al, Cu, Zn, an alloy of at least two of these, an Mg alloy, or the like, or another metal other than the non-ferrous metal.
  • the container 1 is freely detachable from the device 100 .
  • the magnetic field device 2 is also freely detachable from the device 100 mutually independent from the container 1 .
  • the container 1 includes a cylindrical container body 5 and end plates 6 and 7 that close upper and lower ends thereof, in which both the container body and the end plates are made from a refractory material.
  • the end plates 6 and 7 are attached to the container body 5 with pressure tightness in a manner capable of sealing the inside of the container body 5 .
  • at least one of the end plates 6 and 7 (the upper end plate 6 in the illustrated embodiment) is detachable from the container body 5 .
  • the reason why the pressure tightness is provided between the container body 5 and the end plates 6 and 7 is to keep a high-pressure state in the inside of the container even in a case where the inside of the container 1 comes to have a high pressure.
  • a pair of electrodes (an upper electrode and a lower electrode) 8 and 9 each made from an electric conductor (for example, ceramics having a conductive property, such as graphite) are substantially vertically installed at the center portions (substantially central portions) of the end plates 6 and 7 in a fixed state while the electrodes respectively pass through the end plates 6 and 7 in a thickness direction.
  • the upper electrode 8 and the lower electrode 9 are located on a substantially vertical straight line in an upper-lower direction, and face each other in the shortest distance.
  • the container body 5 can have various configurations such that a product P obtained by solidifying the molten metal M can be easily taken out.
  • the container body 5 can be divided into two.
  • the inside thereof may be tapered.
  • the annular magnetic field device 2 including a permanent magnet is arranged at an outer peripheral position of the container body 5 .
  • an N pole of one magnet (magnet body) 2 a faces the other magnet (magnet body) 2 b sideways as understood from FIG. 4 .
  • an S pole of the one magnet 2 a may face an N pole of the other magnet 2 b on the contrary.
  • the magnetic field device 2 can also include an electromagnet.
  • Both the container 1 and the magnetic field device 2 are detachable from the metal product manufacturing device 100 in a manner relatively independent from each other.
  • the container 1 can be attached to or detached from the magnetic field device 2 provided in a fixed state, as illustrated in the state illustrated in FIG. 1 .
  • the magnetic field device 2 can be detachably incorporated into the container 1 provided in the fixed state.
  • a magnetic field device 2 A including a pair of magnet pieces 2 a 1 and 2 b 1 can also be used as illustrated in FIG. 5 , instead of the integral annular magnetic field device 2 in FIG. 4 .
  • the magnetic field device 2 A can also include an electromagnet.
  • polarities of the pair of magnet pieces 2 a 1 and 2 b 1 are switched at a desired period such as 1 Hz to 10 Hz, so as to switch a magnetic force line ML between a state of running from right to left and a state of running from left to right in the drawing of FIG. 5 .
  • the electrodes 8 and 9 of the container body 5 are connected to the power supply device 3 by wires 11 and 12 , respectively.
  • the wires 11 and 12 can be connected to and disconnected from the electrodes 8 and 9 , respectively.
  • the power supply device 3 can apply a direct current and an alternating current.
  • the container 1 is relatively detachable from the magnetic field device 2 as described above. Accordingly, the container 1 can take a state incorporated into the device 100 as illustrated in FIG. 1 and a state detached from the device as illustrated in FIG. 1A . Needless to mention, the magnetic field device 2 is also detachable from the device 100 as described above.
  • the metal product manufacturing device 100 includes the magnetic field device 2 as described later in detail. Therefore, in a case of applying a current I to the molten metal M in an operating state of the magnetic field device 2 , first Lorentz force (electromagnetic force) and second Lorentz force (electromagnetic force) act at the same time. However, as described later, in a case where no magnetic field device 2 is provided or in a case where the magnetic field device 2 is not in the operating state, only the first Lorentz force acts as described later.
  • the first Lorentz force is electromagnetic force generated by combination of the current I and a magnetic field based on the current I.
  • the second Lorentz force is electromagnetic force generated by combination of the current I and an externally-applied magnetic field.
  • the first Lorentz force serves as force directed toward a center of the molten metal M, this force generates a pressure gradient inside the molten metal M, Archimedes electromagnetic force acts on impurities inside the molten metal M, and the impurities are moved toward a periphery of the molten metal M.
  • the second Lorentz force is applied to the molten metal M in a direction of laterally driving the molten metal M. In other words, combination of the current I flowing inside the molten metal M with the magnetic field from the magnetic field device 2 generates the second Lorentz force, and this second Lorentz force is applied to the molten metal M.
  • FIG. 9 is a side view and FIG. 10 is a plan view, and both schematically illustrate density distribution of the current I at this time.
  • This current distribution is obtained from findings obtained by the present inventor on the basis of his long-time experience in the art of the technical field of the present invention. At the same time, a reason why this current distribution is technically correct is supported by a fact that the products illustrated in FIGS. 24 to 26 are obtained as described above according to the present invention.
  • the current density becomes high near the electrodes 8 and 9 , and the current density becomes low at positions away from the electrodes 8 and 9 .
  • the current I flowing between the pair of electrodes 8 and 9 via the molten metal M is illustrated in a coarse/dense state for easy visual understanding, while deeming the current I as a group of a plurality of unitary currents Iu.
  • the Lorentz force f (first Lorentz force) directed toward the center is generated in the molten metal M of the non-ferrous metal or the current density metal as a base.
  • This Lorentz force is the force that pushes the non-ferrous metal or another metal toward the center part.
  • a pressure gradient in which a pressure is high on the center side and a pressure is low on the periphery side is generated.
  • FIG. 13 One example of this pressure gradient is illustrated in FIG. 13 . As understood from FIG. 13 , pressure P is higher at a center C than at a periphery P.
  • a non-ferrous metal product or another metal product having high purity can be obtained by removing the non-ferrous metal or another metal having the high impurity concentration at the peripheral portion PP by a desired method.
  • FIGS. 16 to 18 are explanatory views corresponding to FIGS. 10 to 12 .
  • an alternating current can also be applied between the pair of electrodes 8 and 9 .
  • the Archimedes electromagnetic force applied to the impurities is not changed from the case of applying the direct current in any of the directions, and the impurities are gathered at the peripheral portion of the product by the Archimedes electromagnetic force.
  • FIGS. 19 and 20 assume that the current I is applied downward in the drawing like this FIG. 19 . Consequently, the current I is combined with the magnetic force lines ML from the magnetic field device 2 , and streams of the second Lorentz force (F 11 and F 21 ) ( FIG. 20 ) are generated. Alternatively, assume that the current I is applied upward from below in FIG. 19 . In this case also, streams of the second Lorentz force (F 12 and F 22 ) are generated similar to the case where the current flows downward from above, but the directions thereof are opposite.
  • the Lorentz force (second Lorentz force) caused by combination of the current I with the magnetic field from the magnetic field device 2 is reversed in accordance with a period of the alternating current.
  • the streams of the Lorentz force (second Lorentz force) F 11 and F 22 acting in the directions as illustrated in FIG. 20 and the streams of the Lorentz force (second Lorentz force) 12 and F 22 acting in the direction as illustrated in FIG. 21 are alternately applied to the molten metal M
  • FIG. 19 consider the case where the current I flows downward in the drawing.
  • the magnetic force lines ML are directed from right to left in the drawing as illustrated in FIG. 19 . Consequently, the current I (respective unitary currents Iu) and the magnetic force lines ML are combined, and the streams of the electromagnetic force (second Lorentz force) F 11 and F 21 are generated as illustrated in FIG. 20 .
  • the streams of the electromagnetic force (second Lorentz force) F 12 and F 22 are generated as illustrated in FIG. 21 .
  • the molten metal is applied with the streams of the electromagnetic force F 11 and F 21 and streams of the electromagnetic force F 11 and F 21 which are alternately directed in the opposite directions in accordance with the period of the applied current I. Consequently, micro-vibration is caused in the molten metal M. Since such micro-vibration is added to the molten metal M, accumulation of the impurities is accelerated at the peripheral portion PP of the product by the Archimedes electromagnetic force as illustrated in FIG. 14 in the process of changing the molten metal from a liquid phase state to a solid phase state by cooling, and finally, the product P as illustrated in FIG. 14 can be obtained.
  • the alternating current as the current I for example, 1 to 10 Hz or the like
  • a metal product with high accuracy can be obtained when the impurities IM at the peripheral portion PP are removed by a desired method.
  • the impurities are accumulated at the periphery of the product P and can be easily visually grasped, and therefore, removal work of the impurities can be easily and surely performed, and the product P of the non-ferrous metal or another metal can be surely obtained with higher accuracy.
  • the metal product manufacturing device 100 of the present invention can adopt various configurations and various modes of use.
  • the following modes can also be adopted.
  • the magnetic field device 2 manufactured from the permanent magnet is installed, or the magnetic field device 2 manufactured from the electromagnet is set to the operating state, and in this state, the direct current or the alternating current is applied as the current I between the electrodes 8 and 9 .
  • the direct current or the alternating current is applied as the current I between the electrodes 8 and 9 .
  • the direction of the electromagnetic force applied to the molten metal M is switched between the opposite directions in a short period, and similar states where the molten metal M is vibrated are obtained as illustrated in FIGS. 20 and 21 , and therefore, it is possible to obtain a greater effect of separating the impurities by the Archimedes electromagnetic force.
  • the magnetic field device 2 when a weak effect is confirmed in accumulating the impurities IM at the peripheral portion PP of the product P at the time of applying the alternating current, the magnetic field device 2 can be detached or set to the non-operating state, although it depends on an actual device.
  • the reason therefor is as follows.
  • the N and S directions of the magnetic field generated by the alternating current are changed.
  • an external magnetic field is a static magnetic field. Accordingly, the static magnetic field and the external magnetic field cancel each other. Thence, in a case of applying the alternating current, it is better to exclude the external magnetic field.
  • the direct current is applied in a state of applying the magnetic field by the magnetic field device 2 .
  • the container 1 is detached from the metal product manufacturing device 100 and made to the state illustrated in FIG. 1A .
  • the upper end plate 6 of the detached container 1 is detached as illustrated in FIG. 8 , and a non-ferrous metal or another metal provided which is solid, provided as a raw material, and containing impurities is stored inside the container 1 .
  • the upper end plate 6 is attached to the container body 5 in a sealed state.
  • the raw material it is possible to use, for example, the non-ferrous metal or another metal selected from scrap or the like and containing impurities.
  • an amount of the raw material an amount that allows electrical conduction between a molten metal and the pair of electrodes 8 and 9 when the raw material is melted and becomes the molten metal afterward is selected.
  • the container 1 is put into a heating furnace (not illustrated) such as an electric furnace, and then heated, and the raw material, in other words, the non-ferrous metal or another metal inside the container 1 is melted and made into the molten metal M.
  • a heating furnace such as an electric furnace
  • the container 1 is taken out from the melting furnace, and is incorporated into the device 100 as illustrated in FIG. 1 . Consequently, the current I can be applied to the molten metal M inside the container 1 by the pair of electrodes 8 and 9 , and a magnetic field can be applied to the molten metal M by the magnetic field device 2 .
  • cooling is performed in a state of applying the direct current I in the present metal product manufacturing device 100 like (a) or (b) above, for example.
  • a product P of the solidified non-ferrous metal or another metal is taken out from the container 1 .
  • FIG. 14 An end surface of the billet-shaped product P thus obtained is illustrated in, for example, FIG. 14 .
  • the product P is obtained as a product containing a large amount of impurities at the peripheral portion PP and containing little impurities in the inner portion IP.
  • the peripheral portion PP of the product P is removed by a desired means to obtain a final product.
  • a device made from electromagnets is used as the magnetic field device 2 , switching between the state where the magnetic force lines ML run from right to left and the state where the magnetic force lines ML run from left to right as illustrated in FIG. 19 can be performed by switching magnetic poles at a predetermined period (1 Hz to 10 Hz or the like) in FIG. 19 .
  • the direct current is to be applied as the current I.
  • a container body made from a mullite tube was used as the container body 5 .
  • a non-ferrous metal provided as a raw material and containing impurities Al-10 mass % Fe having a size of ⁇ 18 mm ⁇ a length 50 mm was stored inside this container body.
  • graphite electrodes were used for the pair of electrodes 8 and 9 .
  • the container 1 containing the molten metal that was melted and had a temperature of about 1000° C. was incorporated into the metal product manufacturing device 100 , and a magnetic field (0.54 T) was applied by the magnetic field device 2 , and then cooling was performed while applying, as the current I, direct currents of various values between the pair of electrodes 8 and 9 .
  • the values of the current I were appropriately selected from a range of 20 A to 100 A. Note that voltage to be applied at this time is to be adjusted such that the current comes to have an expected value.
  • FIGS. 22 to 26 were obtained from color photographs of the macroscopic structure obtained at this time. These FIGS. 22 to 26 selectively indicate, from among the impurities, Al3Fe as an impurity that might cause quality deterioration particularly in aluminum. In FIGS. 22 to 26 , values of the applied currents and dimensions of the products are additionally indicated, respectively.
  • the impurities Al 3 Fe was successfully accumulated at the peripheral portion PP of the product P. Additionally, it was also found that the impurity Al 3 Fe was more successfully accumulated at the peripheral portion PP when the current of 100 A or less was applied under the conditions of the present experiment described above. Having studied this, it is estimated that when the current was large, the electromagnetic force F 11 , F 21 , F 12 , and F 22 was too strong, and Al 3 Fe was dispersed inside the base. Judging from this, it can be considered that there are optimal values for: strength of the magnetic field of the magnetic field device 2 ; and magnitude of the current.
  • Such optimal values depend on various parameters, such as a kind of the non-ferrous metal or another metal as the raw material (a kind of a molten metal), various dimensions, a temperature, magnetic field strength, a current value, and other values.
  • a kind of the non-ferrous metal or another metal as the raw material a kind of a molten metal
  • various dimensions e.g., various dimensions, a temperature, magnetic field strength, a current value, and other values.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
US16/762,035 2017-11-08 2018-09-04 Metal product manufacturing device and metal product manufacturing method Abandoned US20200338635A1 (en)

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JP2017-215772 2017-11-08
JP2017215772 2017-11-08
JP2018151898A JP7098479B2 (ja) 2017-11-08 2018-08-10 金属製品製造装置及び金属製品製造方法
JP2018-151898 2018-08-10
PCT/JP2018/032765 WO2019092962A1 (fr) 2017-11-08 2018-09-04 Dispositif de fabrication d'un produit métallique et procédé de fabrication d'un produit métallique

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230234126A1 (en) * 2020-06-18 2023-07-27 Voestalpine Additive Manufacturing Center Gmbh Actuator for a casting mold for producing metal components

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US3246373A (en) * 1962-06-22 1966-04-19 United States Steel Corp Magnetic stirring device and method
FR2602320B1 (fr) * 1986-08-01 1989-12-29 Clecim Sa Procede de fusion de ferraille et four electrique pour la mise en oeuvre du procede
JP3424259B2 (ja) * 1993-04-15 2003-07-07 石川島播磨重工業株式会社 直流アーク炉
JPH0860263A (ja) * 1994-08-23 1996-03-05 Shigeo Asai 溶融金属からの不純物元素の除去方法および装置
JP3665857B2 (ja) 2001-07-23 2005-06-29 独立行政法人科学技術振興機構 溶融金属中分散物の分離法及び装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20230234126A1 (en) * 2020-06-18 2023-07-27 Voestalpine Additive Manufacturing Center Gmbh Actuator for a casting mold for producing metal components

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JP2019085642A (ja) 2019-06-06
CA3085425A1 (fr) 2019-05-16
EP3708686A4 (fr) 2021-05-19
AU2018364870A1 (en) 2020-05-28
EP3708686A1 (fr) 2020-09-16
JP7098479B2 (ja) 2022-07-11

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