US3300564A - Vacuum induction furnace - Google Patents

Vacuum induction furnace Download PDF

Info

Publication number
US3300564A
US3300564A US375165A US37516564A US3300564A US 3300564 A US3300564 A US 3300564A US 375165 A US375165 A US 375165A US 37516564 A US37516564 A US 37516564A US 3300564 A US3300564 A US 3300564A
Authority
US
United States
Prior art keywords
sleeve
crucible
furnace
vacuum
sealing
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.)
Expired - Lifetime
Application number
US375165A
Other languages
English (en)
Inventor
Junker Otto
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.)
Otto Junker GmbH
Original Assignee
Otto Junker GmbH
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 Otto Junker GmbH filed Critical Otto Junker GmbH
Application granted granted Critical
Publication of US3300564A publication Critical patent/US3300564A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • C21C5/5241—Manufacture of steel in electric furnaces in an inductively heated furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/04—Crucible or pot furnaces adapted for treating the charge in vacuum or special atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
    • F27B14/061—Induction furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/04—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated adapted for treating the charge in vacuum or special atmosphere
    • 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
    • H05B6/24—Crucible furnaces
    • H05B6/26—Crucible furnaces using vacuum or particular gas atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details specially adapted for crucible or pot furnaces
    • F27B14/10—Crucibles
    • F27B14/12—Covers therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details specially adapted for crucible or pot furnaces
    • F27B2014/0837—Cooling arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details specially adapted for crucible or pot furnaces
    • F27B2014/0862—Flux guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B14/00—Crucible or pot furnaces
    • F27B14/08—Details specially adapted for crucible or pot furnaces
    • F27B2014/0868—Magnetic shields
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00—Arrangement of monitoring devices; Arrangement of safety devices
    • F27D21/02—Observation or illuminating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining or circulating atmospheres in heating chambers
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
    • 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
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S15/00—Brushing, scrubbing, and general cleaning
    • Y10S15/02—Car cleaning plants

Definitions

  • the invention relates to vacuum induction furnaces, and relates more particularly to coreless induction vacuum furnaces for large capacity charges, for either melting or holding under rarefied air.
  • the invention relates to melting furnaces, as well as to holding furnaces, and wherever herein below one of these types is mentioned, it will be understood that this mentioning also is meant to include the other type.
  • furnaces may be installedinto the steel melting process before the .pouring of the'steel into molds; these line frequency induction lfurnaces may be connected with their induction coil directly to the existing network; the large, though controllable, bath movement that is characteristic of coreless induction furnaces offers the advantage that the de-gasing ofthe steel melt is intensied and accelerated, as the gases are constantly moved from the interior of the metal bath to the surface, where they are removed by the prevailing vacuum.
  • Patent No. 3,056,847 relates to a coreless vacuum induction furnace for large capacity charges.
  • the furnace includes an upper part and a lower p-art, a crucible that extends between these parts and holds the molten metal bath, a primary induction coil, and vacuum sealing means.
  • the vacuum sealing means include a gastight sleeve between the coil and the cru-cible and upper and lower -closures which define with the sealing means a vacuum chamber. Cooling means for the sleeve are provided which are disposed adjacent the inner surface of the sleeve.
  • connection to the source of rareiied air is disposed near the upper closure.
  • the aforesaid stray fields primarily affect the outer, uncooled stuffing box pressure rings, so that during the operation there is generated a large amount of Joule heat and the pressure rings are heated to an elevated temperature which may cause damage not only to the gas impermeable sleeve of syn- 3,300,564 Patented Jan. 24, 1967 thetic material, but also to the sealing packings, endangering the vacuum tight sealing of the vacuum chamber of the furnace.
  • pressure rings of this type which are composed of nonmetaliic material, for instance of synthetic plastic material, or of thermo-setting synthetic resin with or without reinforcements.
  • FIG. 1 is a fragmentary vertical sectional view of a vacuum induction furnace in accordance with the invention
  • FIG. 2 is a fragmentary large scale vertical sectional view of a detail framed at II in FIG. 1;
  • FIG. 3 is a fragmentary large scale sectional view, similar to FIG. 1 but showing a detail thereof.
  • FIGS. 1 and 2 there is provided an electric vacuum induction furnace which is supported on a framework 1.
  • the framework 1 rests on a foundation 3 in a depression 2.
  • a frame 4 is provided that is tiltable about hinges 6, and surrounds and is connected to an-d supports the furnace housing which, in turn, surrounds the crucible 7; the housing, on the other hand, is surrounded by and supports the coil and its reinforcements.
  • Furnace tilting means include a hydraulic cylinder 5 that is supported by the foundation 3 and can be actuated to tilt the frame 4 and therewith the furnace housing including the crucible 7 and the coil 17 about the substantially horizontal axis X of the -hinges 6.
  • the frame 4 comprises a bottom structure that is composed of interconnected elongated steel beams and a series of six upright columns 4b which are arranged evenly distributed around a circle, furthermore of channel irons 4c that interconnect the columns 4b to each other, and lastly an outer structure 4d.
  • the frame 4 also comprises beams 4a that support the bottom of the crucible 7.
  • the columns 4b serve to anchor the upper part, a steel mantle 16, of the housing for the crucible 7 to the lower part of that housing, as the furnace including its housing comprises an upper part and a lower part which are gastightly sealed on the exterior.
  • the bottom of the crucible 7 rests on a layer of refractory bricks 8 which, in turn, are supported by a plate 9 that covers the beams 4a.
  • the plate 9 is made of nonferritic metal and forms the lowermost closure of the Vacuum chamber of the furnace.
  • a layer 11 that is composed of a material having high electric conductivity characteristics.
  • the layer 11 is disposed below the yokes 10 and below the 'bricks 8.
  • the outer wall section of the crucible 7 includes 4an insulating layer 12 that may be composed of mica, asbestos, or reproof felt.
  • a cylindrical sleeve 13 is placed without play around the insulating ,layer 12.
  • the sleeve 13 is composed of la gas impermeable material of high mechanical strength, but of low electric conductivity, such as synthetic plastic or thermo-setting synthetic material or synthetic resin with or without reinforcements; this sleeve 13 forms the lateral vacuum seal for the crucible 7.
  • Vacuum sealing means comprise the cylindrical sleeve 13 that is composed of gas impermeable material having low electric and magnetic conductivity characteristics, such as synthetic plastic, plastic impregnated paper, or the like.
  • the lower edge of the sleeve 13, as best shown in FIG. 2, is inserted into an annular groove that is formed by an annular flange 14 that is welded to the plate 9 and projects upwardly therefrom.
  • the flange 14 may be hollow to provide a conduit for a cooling fluid, :and is provided with connections for the entrance and exit of the cooling fluid.
  • the sealing of the sleeve 13 in the laforesaid annular groove is carried out lby means of a packing 14a that is cooled by the ⁇ aforesaid cooling conduit.
  • the packing 14a is pressed downwardly by a pressure ring 15 that is'forced down by screws 15a that connect the ring 15 with the stationary annular ange 14 adjustably in the manner of a s'tufng box.
  • the pressure ring 15 is composed of material free from eddy currents, and the remaining parts of the stutlng box of material having low eddy current characteristics, such as non-ferritic material.
  • the pressure ring 15 is composed of lan electrically non-conducting material, such as plastic, self-hardening resin, or non-ferritic metal; when it is made of non-ferritic metal, the pressure ring 15 is provided with at least one radial slot to prevent the passage of electric current.
  • the sleeve 13 extends downwardly beyond the coil 17, and extends upwardly beyond the electric range of iniluence of the coil 17.
  • the upper end of the sleeve 13 is vacuum sealed in a manner similar to that of the lower end of the sleeve 13.
  • the packing 14a is received in a hollow groove that is formed by an annular flange 14 that has an internal conduit for a coolant.
  • the annular flange 14 of the upper part of the sleeve 13 is, however, connected to the steel mantle 16 that forms part of the housing of the furnace, and also, like the sleeve 13, forms lpart of the vacuum sealing means, and surrounds the upper part of the crucible 7 and surrounds the spout 7a.
  • the crucible 7 and the spout 7a are formed of rammed refractory material.
  • each tube 18 is bent back upon itself and is preferably composed of austenitic, heat resistant steel.
  • the tubes 18 are embedded into the rammed mass of the crucible 7, and are disposed inwardly of an insulating layer 12 that is interposed between the tubes 18 and the sleeve 13.
  • the tubes 18 are surrounded by a particularly fine ramming mass 19 composed of highly refractory material.
  • Each t-ube 18 is shaped like an inverted U and has both open ends 18a and 1gb directed downwardly.
  • Each tube 118 has a circular cross section at the entrance end 18a and the lower exit end 18b, while throughout the remainder of its length throughout which including its .bend it is embedded in the mass, it has a at cross section, narrow in the radial plane of the sleeve 13. This ilat squeezed shape serves the purpose to increase the cooling surface of the tubes 18 for the sleeve 13.
  • Crossbraces 18C are provided that interconnect the long sidewalls inside the tubes 18, and extend throughout the tube length, which serve to compensate for the reduced static strength in the aforesaid radial plane; these cross braces 18e preferably also are composed of austenitic, heat resistant steel.
  • sheets 20 are provided to take up pressures thatare exerted by the molten metal radially outwardly, and between the sheets 20 and that side of the tubes 18 which faces the center of the crucible, there is provided an additional insulating layer 21.
  • Each sheet 20 is preferably also made of austenitic steel, while the layer 21 is composed of material that has poor electric and heat conductivity characteristics.
  • the shorter entrance ends of the tufbes 18a terminate in an annular channel 22 that forms a part of the bottom support structure for the crucible 7.
  • the annular channel 22 is provided with an entrance pipe for the connection to a blower for the cooling fluid (not shown).
  • the annular channel 22 is supported on the beams 4a of the tiltable frame 4, Iand serves on one hand to support the bottom plate 9, and on the other hand serves to be connected to the columns 4b.
  • the longer leg of eac-h tube l18 has its exit end 18b projecting axially through the -annular channel 22 into the atmosphere, for the discharge of the cooling fluid.
  • the sleeve 13 is surrounded, along a portion of its height, by the coil 17.
  • a series of twelve C-yokes 24 are arranged evenly spaced from each other circularly about the coil 17 to the exterior thereof.
  • Each yoke 24 is composed of lamellae of transformer sheet metal.
  • a terminal 25 is provided for the electric current for interconnecting the coil 17 with the network; and a connection 26 is provided for interconnecting the coil 17 with a cooling liquid that courses, in a well-know manner, in the interior of the hollow coil 17.
  • the conduits 14 for cooling the sealing devices heretofore described are also connected to the connection 26.
  • the cooling conduits for the sealing devices hereafter described are 'also connected to the connection 26.
  • the space between the inner surface of the coil 17 and the outer surface lof the sleeve 13 is filled with a layer 27 of liquid self-hardening resin, in order to take up the radially outwardly directed pressures of the ceramic material of the crucible 7, and to transfer it to the frame of the furnace.
  • An insulation 28 composed of mica, asbestos or fireproof felt is provided between the coil 17 and the yokes 24 that surround the coil 17.
  • the coil 17 is supported at its lower end by the inner leg of the yokes 24 and an insulating layer 29 thereon.
  • lingers 30a To take up the electromechanical forces which occur in the windings of the coil 17 during the operation ofthe furnace, there are provided lingers 30a and a spring loaded anchor bolt 30.
  • Each spring loaded anchorbolt 30 is connected to Ia yoke 24.
  • the crucible 7 is open on top and is covered, except for that part which leads into the spout 7a, by an inner cover 33.
  • the cover 33 is vaulted and is composed of refractory bricks which are held together by a metal frame 33a.
  • a stopper 34 which is also composed of refractory material, closes the open channel that leads to the spout 7a,
  • a bell-shaped outer lid 35 is provided that surmounts the crucible 7, the inner cover 33, as well as the spout 7a.
  • the outer lid 35 is composed of steel sheet, and is lined on the interior with a fireproof insulation layer 35a.
  • the lower rim of the outer lid 35 has an inverted annular groove 36 which is filled with a deformable sealant 36a.
  • the lid 35 On the exterior, the lid 35 has near the groove 36 an annular cooling conduit 37 which is provided with fittings ⁇ 57a to be connected to the cooling connection 26.
  • the lid 35 rests with the sealant 36a on the apex of an annular wedge-shaped upright sealing ridge 38 that is formed on an annular carrying flange 39.
  • the carrying flange 39 is hollow and has an internal conduit for a cooling fluid including a fitting 39a to be connected to the cooling connection 26.
  • the carrying flange 39 by means of connecting struts 40, is welded to said steel mantle 16, ⁇ and therefore is united therewith.
  • the inner cover 33 has a central aperture or opening 33h and the outer lid 35 has an opening 3517 in register therewith. These openings 33b and 35b serve for the sampling of the lmolten metal mass or the adding of alloying material. Both openings may be closed.
  • the opening 35b may gastightly be closed by a stopper 46 and, in connection with Ia superstructure 47, be sealed with a cap 43 which Works according to the same principle as the lid 35 itself in connection with the sealing device that comprises the deformable sealant 36a, the ridge 38 and the cooling conduits 37 in the flange 39, as previously described.
  • An objective 49 is provided that is sealed to the outer lid 35 and which permits viewing through the aperture 33h of the Crucible 7 during operation of the furnace.
  • the 'aperture 33b of the inner cover 33 may be closed by a ap 50 that is composed of refractory material and is manipulated from the exterior at 52 and is pivoted at 51.
  • a Crucible for large capacity charges, the combination of, a Crucible, a primary induction coil adapted to be fed from an electric source surrounding said crucible, vacuum sealing means comprising a furnace housing, a sleeve including gas impermeable material having low electric and magnetic conductivity characteristics disposed between said coil and said cruci'ble, land gastight upper and lower closure means operable for airtightly closing the upper and, respectively, the lower ends of said vacuum sealing means and defining a vacuum chamber housing said Crucible, and cooling means for said sleeve disposed ⁇ adjacent the inner surface of at least a portion of said sleeve, said sealing means comprising upper and lower sealing devices between the furnace housing and said sleeve each sealing device comprising an adjustable stufllng box including a packing, and a pressure ring surrounding a portion of said sleeve and exerting pressure on said packing for sealing said sleeve portion and being free from eddy currents, the remaining parts of the stuffing box
  • each lpressure ring being composed of metal and having at least one radial slot
  • each pressure ring being composed of non-ferritic metal.
  • each pressure ring being composed of non-metallic synthetic material.
  • each sealing device comprising a stationary annular flange operable to receive the packing and the end portion of the sleeve and being composed of non-ferritic metal.
  • each stationary annular flange defining a conduit for a cooling fluid, and including means for delivering cooling fluid to said cond-uit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Insulating Of Coils (AREA)
US375165A 1963-06-20 1964-06-15 Vacuum induction furnace Expired - Lifetime US3300564A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEJ0023902 1963-06-20
DE1963J0023901 DE1227926C2 (de) 1963-06-20 1963-06-20 Kernloser, insbesondere mit Netzfrequenz betriebener Induktions-Schmelz- und/oder Warmhalteofen fuer Vakuumbetrieb

Publications (1)

Publication Number Publication Date
US3300564A true US3300564A (en) 1967-01-24

Family

ID=42985349

Family Applications (4)

Application Number Title Priority Date Filing Date
US375165A Expired - Lifetime US3300564A (en) 1963-06-20 1964-06-15 Vacuum induction furnace
US375166A Expired - Lifetime US3300565A (en) 1963-06-20 1964-06-15 Vacuum induction furnace
US375163A Expired - Lifetime US3303259A (en) 1963-06-20 1964-06-15 Vacuum induction furnace
US375164A Expired - Lifetime US3303258A (en) 1963-06-20 1964-06-15 Vacuum induction furnace

Family Applications After (3)

Application Number Title Priority Date Filing Date
US375166A Expired - Lifetime US3300565A (en) 1963-06-20 1964-06-15 Vacuum induction furnace
US375163A Expired - Lifetime US3303259A (en) 1963-06-20 1964-06-15 Vacuum induction furnace
US375164A Expired - Lifetime US3303258A (en) 1963-06-20 1964-06-15 Vacuum induction furnace

Country Status (7)

Country Link
US (4) US3300564A (de)
AT (2) AT257186B (de)
BE (2) BE649555A (de)
DE (2) DE1227926C2 (de)
FR (5) FR1220513A (de)
GB (2) GB1067326A (de)
SE (1) SE313626B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130044785A1 (en) * 2011-08-15 2013-02-21 Gerrard HOLMS Electric induction melting assembly
FR3056713A1 (fr) * 2016-09-27 2018-03-30 Centre Nat Rech Scient Four a induction tout metal a haute temperature, destine a fondre des echantillons de mineraux et/ou de roches pour l'extraction des gaz sous ultravide
CN113899200A (zh) * 2021-11-17 2022-01-07 株洲火炬工业炉有限责任公司 一种碳化铬生产用真空感应烧结炉

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2087235A5 (de) * 1970-05-12 1971-12-31 Commissariat Energie Atomique
DE2313157C3 (de) * 1973-03-16 1981-12-17 Brown, Boveri & Cie Ag, 6800 Mannheim Induktions-Tiegelofen
DE2318193B2 (de) * 1973-04-11 1975-08-28 Brown, Boveri & Cie Ag, 6800 Mannheim Induktions-Tiegelofen
BG26139A1 (en) * 1978-02-27 1979-12-12 Nikolov Induction crucible furnace
SE442473B (sv) * 1981-12-04 1985-12-23 Asea Ab Induktionsspole
IT1168806B (it) * 1983-07-27 1987-05-20 Giuseppe Crescenzi Forno elettrico ad induzione a crogiolo per la colata a pressione
JPS6057187A (ja) * 1983-09-09 1985-04-02 新日本製鐵株式会社 溶融金属誘導加熱装置
DE3337657A1 (de) * 1983-10-17 1985-04-25 Georg 7100 Heilbronn Kühnle Einrichtung zum einschmelzen von schrott und abfaellen aus nicht-eisenmetallen
DE3405120C2 (de) * 1984-02-14 1986-11-13 Otto Junker Gmbh, 5107 Simmerath Kernloser Induktionsofen mit Distanzmitteln zwischen den Induktionsspulen-Windungen
DE3530471A1 (de) * 1985-08-27 1987-03-05 Leybold Heraeus Gmbh & Co Kg Induktionsofen mit einem ofenunterteil und einem deckel
DE3534300A1 (de) * 1985-09-26 1987-04-02 Noell Gmbh Anlage zum einschmelzen von metallen
SE8600616L (sv) * 1986-02-12 1987-08-13 Asea Ab Induktionsugn
GB2267666A (en) * 1989-11-09 1993-12-15 Fuji Electric Co Ltd Apparatus for heating molten metal in a ladle using an induction coil provided with refractory material
US5550353A (en) * 1990-01-31 1996-08-27 Inductotherm Corp. Induction heating coil assembly for prevent of circulating current in induction heating lines for continuous-cast products
US5416794A (en) * 1990-01-31 1995-05-16 Inductotherm Corp. Induction furnace havng a modular induction coil assembly
DE4115279A1 (de) * 1991-05-10 1992-11-12 Abb Patent Gmbh Induktionstiegelofen
DE4115278A1 (de) * 1991-05-10 1992-11-12 Abb Patent Gmbh Magnetischer rueckschluss fuer einen induktionstiegelofen
US5412185A (en) * 1993-11-29 1995-05-02 General Electric Company Induction heating of polymer matrix composites in an autoclave
DE19622884A1 (de) * 1996-06-07 1997-12-11 Ald Vacuum Techn Gmbh Tiegel zum induktiven Schmelzen oder Überhitzen von Metallen, Legierungen oder anderen elektrisch leitfähigen Werkstoffen
JP2001336881A (ja) 2000-05-30 2001-12-07 Daido Steel Co Ltd 金属の溶解装置
US7606286B2 (en) * 2006-06-07 2009-10-20 Ajax Tocco Magnethermic Corporation Coreless furnace coil clamp
CN104567401B (zh) * 2015-01-09 2016-10-05 上海交通大学 熔融物中频感应高温加热装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3056847A (en) * 1958-04-12 1962-10-02 Junker Otto Vacuum melting induction furnace

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1039200B (de) * 1950-09-27 1958-09-18 Nat Res Corp Vorrichtung zum Schmelzen und Giessen von Metallen unter Vakuum

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3056847A (en) * 1958-04-12 1962-10-02 Junker Otto Vacuum melting induction furnace

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130044785A1 (en) * 2011-08-15 2013-02-21 Gerrard HOLMS Electric induction melting assembly
US9332594B2 (en) * 2011-08-15 2016-05-03 Consarc Corporation Electric induction melting assembly
US20160249415A1 (en) * 2011-08-15 2016-08-25 Consarc Corporation Electric Induction Melting Assembly
US10433374B2 (en) * 2011-08-15 2019-10-01 Consarc Corporation Electric induction melting assembly
FR3056713A1 (fr) * 2016-09-27 2018-03-30 Centre Nat Rech Scient Four a induction tout metal a haute temperature, destine a fondre des echantillons de mineraux et/ou de roches pour l'extraction des gaz sous ultravide
WO2018059902A1 (fr) * 2016-09-27 2018-04-05 Centre National De La Recherche Scientifique Four a induction tout metal a haute temperature, destine a fondre des echantillons de mineraux et/ou de roches pour l'extraction des gaz sous ultravide
US11421936B2 (en) 2016-09-27 2022-08-23 Centre National De La Recherche Scientifque High-temperature all-metal induction furnace, intended to melt samples of minerals and/or rocks for extracting gases under ultra-high vacuum
CN113899200A (zh) * 2021-11-17 2022-01-07 株洲火炬工业炉有限责任公司 一种碳化铬生产用真空感应烧结炉
CN113899200B (zh) * 2021-11-17 2023-08-25 株洲火炬工业炉有限责任公司 一种碳化铬生产用真空感应烧结炉

Also Published As

Publication number Publication date
FR92002E (fr) 1968-09-13
GB1067326A (en) 1967-05-03
AT257185B (de) 1967-09-25
DE1227926C2 (de) 1973-03-08
BE649556A (de) 1964-10-16
FR92003E (fr) 1968-09-13
US3300565A (en) 1967-01-24
US3303259A (en) 1967-02-07
DE1227926B (de) 1966-11-03
SE313626B (de) 1969-08-18
FR92004E (fr) 1968-09-13
BE649555A (de) 1964-10-16
GB1067323A (en) 1967-05-03
US3303258A (en) 1967-02-07
AT257186B (de) 1967-09-25
FR92005E (fr) 1968-09-13
DE1268166B (de) 1968-05-16
FR1220513A (fr) 1960-05-25

Similar Documents

Publication Publication Date Title
US3300564A (en) Vacuum induction furnace
US20080308551A1 (en) Induction furnace susceptor for heating a workpiece in an inert atmosphere or in a vacuum
GB1348572A (en) Vessel for use in heat treatment of molten metal
US2243096A (en) Electrode seal
US4183508A (en) Metallurgical induction heating apparatus
US3056847A (en) Vacuum melting induction furnace
US3004091A (en) Coreless induction furnace melting of metals
US3235243A (en) Apparatus for producing ultraclean alloy steels
EP0232846B1 (de) Induktionsofen oder anderer induktionsgeheizter Behälter
US5257281A (en) Induction heating apparatus and method
US2405236A (en) Electrode sealing means
US3412195A (en) Intermediate furnace barrier
US3811001A (en) Tiltable induction furnace for molten metals
US1940256A (en) Induction furnace
US3628779A (en) Furnace for heat-treating objects under high pressure
KR900003403B1 (ko) 전자(電磁)펌프
US3520980A (en) Crucible for heat treatment of conductive materials
US4123045A (en) Crucible for induction heating apparatus
US2826624A (en) Vapor shield for induction furnace
GB2238496A (en) Ladle with apparatus for heating molten metal
US2997512A (en) Coreless electric induction furnace
US1837031A (en) High frequency induction furnace or heating apparatus
US2755326A (en) Induction furnace
US3334171A (en) Vacuum furnace
US2599779A (en) Electric furnace