EP0387374A1 - Four de fusion à induction - Google Patents

Four de fusion à induction Download PDF

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Publication number
EP0387374A1
EP0387374A1 EP89104557A EP89104557A EP0387374A1 EP 0387374 A1 EP0387374 A1 EP 0387374A1 EP 89104557 A EP89104557 A EP 89104557A EP 89104557 A EP89104557 A EP 89104557A EP 0387374 A1 EP0387374 A1 EP 0387374A1
Authority
EP
European Patent Office
Prior art keywords
crucible
inductor
rods
metal
thermal conductivity
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.)
Ceased
Application number
EP89104557A
Other languages
German (de)
English (en)
Inventor
Igor Valentinovich Kuzovlev
Alexandr Pavlovich Gubchenko
Sergei Leonidovich Sheffer
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.)
VSESOJUZNY NAUCHNO-ISSLEDOVATELSKY PROEKTNO-KONSTRUKTORSKY I TEKHNOLOGICHESKY INST ELEKTROTERMICHESKOGO OBORUDOVANIA VNIIETO
Original Assignee
VSESOJUZNY NAUCHNO-ISSLEDOVATELSKY PROEKTNO-KONSTRUKTORSKY I TEKHNOLOGICHESKY INST ELEKTROTERMICHESKOGO OBORUDOVANIA VNIIETO
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 VSESOJUZNY NAUCHNO-ISSLEDOVATELSKY PROEKTNO-KONSTRUKTORSKY I TEKHNOLOGICHESKY INST ELEKTROTERMICHESKOGO OBORUDOVANIA VNIIETO filed Critical VSESOJUZNY NAUCHNO-ISSLEDOVATELSKY PROEKTNO-KONSTRUKTORSKY I TEKHNOLOGICHESKY INST ELEKTROTERMICHESKOGO OBORUDOVANIA VNIIETO
Priority to EP89104557A priority Critical patent/EP0387374A1/fr
Publication of EP0387374A1 publication Critical patent/EP0387374A1/fr
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/22—Furnaces without an endless core

Definitions

  • the invention relates to furnaces for induction melting of metals and relates in particular to induction melting furnaces.
  • An induction melting furnace (LL Tir, NI Fomin "Sovremennye metody induktiionnoi plavki” ("Modern Induction Melting Process"), 1975, publisher "Energiya” (Moscow), p. 43. Fig. 16) is known, which includes a cooled by an inductor Contains metal crucible and a cooled metal team, which is designed in the form of a hermetically sealed chamber, which is connected to a coolant delivery system, wherein in the chamber wall facing the interior of the crucible grooves are made, the height of which is less than the penetration depth of the inductor the frequency of the working current generated electromagnetic field in the metal of the team.
  • induction melting furnace (AE Slukhotskii "Ustanovka induktsionnogo nagreva” ("induction heating system"), 1981, publisher “Energiizdat” (Leningrad), p. 241, Fig. 14-13), which comprises a cooled metal crucible enclosed by an inductor and has a cooled team, which is designed in the form of a hermetically sealed chamber, the interior of which is connected to a coolant delivery system, the chamber wall facing the interior of the crucible being smooth.
  • the invention has for its object to provide an induction melting furnace with such a constructive design of the cooled metal combination, which allows the energy losses of the electromagnetic field of the inductor caused by induction of eddy currents in the combination and the mass of unmelted material to be kept lower than before.
  • the object of the invention is an induction melting furnace which contains a cooled metal crucible enclosed by an inductor and a cooled metal combination which is designed in the form of a hermetically sealed chamber, the interior of which is connected to a coolant delivery system that the interior of the crucible wall of the hermetically sealed chamber of the team in the form of a group of electrically insulated from each other, parallel to the axis of symmetry of the crucible arranged metal rods, which are attached to a base plate, which is made of a material whose thermal conductivity is higher than the coefficient of thermal conductivity of the material from which the rods are made, the diameter of which is selected depending on the specific resistance of their material and on the frequency of the current of the inductor.
  • This diameter is preferably at most equal to the size of the penetration depth of the electromagnetic field generated by the inductor.
  • the present invention makes it possible to eliminate the induction of eddy currents in the cooled metal combination and to reduce the mass of unmelted feed material.
  • the induction melting furnace contains an inductor 1, in the interior of which a crucible 2 is accommodated.
  • the side surface of the crucible 2 is formed by vertically arranged, cooled metal sections 3, which are separated by intermediate layers of electrical insulation 4.
  • a metal team 5 for holding a molten metal 6 is arranged in the lower part of the crucible 2.
  • the team 5 is designed in the form of a hermetically sealed chamber, the interior 7 of which is connected to a coolant delivery system 8.
  • the wall of the chamber of the team 5 facing the interior of the crucible 2 is designed in the form of a group of copper rods 9 which are arranged parallel to the axis of symmetry of the crucible 2 and are insulated from one another by an electrical insulating compound 10.
  • the rods 9 are fastened to a base plate 11 which is made, for example, of silver, but in any case from a material whose coefficient of thermal conductivity is higher than the coefficient of thermal conductivity of copper from which the rods 9 are made.
  • the diameter of each rod 9 is at most the size of the depth of penetration of the electromagnetic field generated by the inductor 1.
  • the induction melting furnace works as follows. A charge is placed in the crucible 2 and a voltage is supplied to the inductor 1. The feed material forms a molten bath 6, the liquid metal, as it flows downward and comes into direct contact with the team 5, not crystallizing out because a strong electromagnetic field is effective on the entire surface of the team 5 facing the melt 6; because the electromagnetic field is directed along the bars 9, which have no shielding effect.
  • the melt 6 is left to stand in order to be able to carry out the required operations, whereupon the metal is discharged from the cold crucible 2, or the melt 6 crystallizes directly in the crucible 2.
  • the selection of the material for the rods 9 and the base plate 11 is due to the fact that the point contact of each rod 9 with the base plate 11 absorbs a considerable part of the radiation emitted by the melt 6.
  • the material of the base plate 11 must have a higher coefficient of thermal conductivity than the material of the rods 9, otherwise the point contact of each rod 9 with the base plate 11 is destroyed by the radiation from the melt 6, and the rods 9 are melted.
  • the utilization factor for the energy of the electromagnetic field of the inductor 1, which is required for melting the feed material, and consequently also the furnace efficiency are increased.
  • the use of the combination 5 of the type according to the invention reduces the mass of unmelted feed material, as a result of which the yield of the usable metal, excluding contamination of the melt 6 by the remainder of the build-up in the previous melting process, is increased.
  • the present invention can be used in induction melting furnaces for melting high-melting and chemically active metals and alloys based thereon in cooled metal crucibles.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Furnace Details (AREA)
EP89104557A 1989-03-15 1989-03-15 Four de fusion à induction Ceased EP0387374A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP89104557A EP0387374A1 (fr) 1989-03-15 1989-03-15 Four de fusion à induction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP89104557A EP0387374A1 (fr) 1989-03-15 1989-03-15 Four de fusion à induction

Publications (1)

Publication Number Publication Date
EP0387374A1 true EP0387374A1 (fr) 1990-09-19

Family

ID=8201088

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89104557A Ceased EP0387374A1 (fr) 1989-03-15 1989-03-15 Four de fusion à induction

Country Status (1)

Country Link
EP (1) EP0387374A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1509043A (fr) * 1966-11-28 1968-01-12 Soc Metallurgique Imphy Enceinte métallique composite
DE2127333A1 (de) * 1970-06-16 1971-12-23 Creusot Loire Induktiv beheizter Tiegel
DE2402833A1 (de) * 1973-09-26 1974-08-01 Asea Ab Induktionstiegelofen
FR2368542A1 (fr) * 1976-10-21 1978-05-19 Siderurgie Fse Inst Rech Perfectionnements aux poches metallurgiques pour traitements inductifs des metaux
EP0119877B1 (fr) * 1983-02-14 1988-02-10 Commissariat A L'energie Atomique Four de fusion par induction à haute fréquence et procédé de préparation de matériaux céramiques à l'aide de ce four

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1509043A (fr) * 1966-11-28 1968-01-12 Soc Metallurgique Imphy Enceinte métallique composite
DE2127333A1 (de) * 1970-06-16 1971-12-23 Creusot Loire Induktiv beheizter Tiegel
DE2402833A1 (de) * 1973-09-26 1974-08-01 Asea Ab Induktionstiegelofen
FR2368542A1 (fr) * 1976-10-21 1978-05-19 Siderurgie Fse Inst Rech Perfectionnements aux poches metallurgiques pour traitements inductifs des metaux
EP0119877B1 (fr) * 1983-02-14 1988-02-10 Commissariat A L'energie Atomique Four de fusion par induction à haute fréquence et procédé de préparation de matériaux céramiques à l'aide de ce four

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