US3303259A - Vacuum induction furnace - Google Patents

Vacuum induction furnace Download PDF

Info

Publication number
US3303259A
US3303259A US375163A US37516364A US3303259A US 3303259 A US3303259 A US 3303259A US 375163 A US375163 A US 375163A US 37516364 A US37516364 A US 37516364A US 3303259 A US3303259 A US 3303259A
Authority
US
United States
Prior art keywords
crucible
sleeve
coil
bottom plate
vacuum
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
US375163A
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 US3303259A publication Critical patent/US3303259A/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

  • VACUUM INDUCTION FURNACE Filed June l5, 1964 4 Sheets-Sheet l F/GJ 48 4 Sheets-Sheet 2 f l 1 l l f l l f l l O. JUNKER L lill Feb. 7, 1967 VACUUM INDUCTION FURNACE Filed June l5, 1964 Feb. 7, 1967 o. JUNKER VACUUM INDUCTION FURNACE 4 Sheets-Sheet 5 Filed June l5, 1964 Feb. 7, 1967 o. JUNKER VACUUM INDUCTION FURNACE 4 sheets-shew l;
  • 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 rarelied 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.
  • coreless induction furnaces especially of line frequency induction furnaces, also known as network frequency induction furnaces, of a network frequency of, for instance, about from 50-60 cycles, is particularly attractive.
  • These furnaces may be installed into the steel melting process before the pouring of the steel into molds; these line frequency induction furnaces may be connected with their induction coil directly to the existing network.
  • the large, though con-trollable, -bath movement that is characteristic of coreless induction furnaces offers the advantage that the de-gasing of the 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 4a coreless electric vacuum induction furnace for large capacity charges.
  • the furnace includes an upper part and a lower part, 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 Crucible 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.
  • the induction coil is surrounded by a series of spaced outer yokes.
  • connection to the source of rareed air is disposed near the upper Closure.
  • 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 ylarge scale horizontal sectional view taken on the line III-III of FIG. l;
  • FIG. 4 is a fragmentary large scale vertical sectional view similar to FIG. 1 but showing a detail thereof, and taken on the line V-V of FIG. 3.
  • 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 and 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 4tilting 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 lbeams 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 bottom plate 9 that covers the beams 4a.
  • the plate 9 is made of non-ferritic metal and forms the lowermost closure of the vacuum chamber of the furnace.
  • the bottom plate 9 may be composed of austenitic steel containing 1'8 percent chromium and 8 percent nickel.
  • a layer 11 that is composed of a material having high electric conductivity characteristics, such as copper.
  • the layer 11 is disposed below the yokes 10 and below the bricks 8.
  • the outer wall section of the crucible 7 includes an insulating layer 12 that may be composed of mica, asbestos, or reproof felt.
  • a cylindrical sleeve 13 is pla-ced without play around the insulating lay 12.
  • the sleeve 13 is composed of a 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 crucilble 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 FIGS. 2 and 4 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 iluid.
  • the sealing of the sleeve 13 in the aforesaid annular groove is carried out by means of a packing 14a that is cooled by the aforesaid cooling unit.
  • 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 annular ange 14 adjustably in the manner of ⁇ a stuing box.
  • the pressure ring 15 is composed of an 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 influence -of the coil 17.
  • the upper end of the sleeve 13 is vacuum sealed in a manner similar to that lof the lower end of the sleeve 13.
  • the packing 14a is received in a hollow groove that is formed by an annular ange 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 part 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 a-re 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 line ramming mass 19 Composed of highly refractory material.
  • Each tube 18 is shaped like an inverted U and has both open ends 18a and 18b directed downwardly.
  • Each tube 18 has a circular cross section at the entrance end 18a and the lower exit end 18]?, 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.
  • Cross braces 18e 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 that are 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 low electric and heat conductivity characteristics.
  • the shorter entrance ends of the tubes 18a terminate in an annular channel 22 that forms a part of the bottom supprot 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 tltable frame 4, and 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 each tube 18 has its exit end 18h projecting axially through the annular channel 22 into the atmosphere, for the dischargi of the cooling fluid.
  • the sleeve 13 is surrounded, along a portion of its height, by the coil 17.
  • a series of twelve outer 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.
  • each bottom yoke 10 is assigned to an outer yoke 24, and each bottom yoke 1l) includes an outer end portion that extends upwardly obliquely and terminates near the lower end of an outer yoke 24 (FIG. 4); the inner end portion of each bottom yoke 10 is disposed between the bottom section of the rammed mass of the Crucible 7, and the bottom plate 9.
  • the yokes 10 are composed of laminated heat insulated transformer steel sheets. This heat insulation may be accomplished by lacquer-coating the individual steel sheets.
  • 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-known 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 of the sleeve 13 is lled with a layer 27 of liquid selfhardening 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.
  • Ari insulation 28 composed of mica, asbestos or fireproof felt is prvided between the coil i7 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 insulatisg layer 29 thereon.
  • ngers 30a To take up the electromechanical forces which occur in the windings of the coil 17 during the operation of the furnace, there are provided ngers 30a and a spring loaded anchor bolt 3l).
  • the fingers 30a press, by means of an insulating layer 29 against the upper portion of the coil 17.
  • Each spring loaded anchor bolt 36 is connected to a 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 7 a.
  • 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 reproof insulation layer 35a.
  • the lower rim of the outer lid 3S 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 ttings 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 Alti, is welded to said steel mantle 16, and therefore is united therewith.
  • the inner cover 33 has a central aperture or opening 3319 and the outer lid 35 has an opening 35b in register therewith. These openings 33h and 35h serve for the sampling of the molten 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 a superstructure 47, be sealed with a cap 48 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 ilange 39, as previously described.
  • An objective 49 is provided that is sealed to they outer lid 35 and which permits viewing through the aperture 33b of the Crucible 7 during operation of the furnace.
  • the aperture 33h of the inner cover 33 may be closed by a flap 50 that is composed of refractory material and is manipulated from the exterior at 52 and is pivoted at 51.
  • an upright Crucible including a bottom section, a primary induction coil adapted to be fed from an electric source surrounding said Crucible, vacuum sealing means comprising a sleeve including gas impermeable material having low electric and magnetic conductivity characteristics disposed between said coil and said Crucible and 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 lower closure means comprising a metallic bottom plate, and shielding means operable for restraining the occurrence of electric energy, generated by stray elds of the induction coil, within said bottom plate.
  • said shielding means comprising at least a part of said bottom plate facing the coil being composed of non-ferritic material.
  • said shielding means comprising a heat insulating layer between the bottom section of said Crucible and said bottom plate, said insulating layer comprising refractory bricks.
  • said bottom plate being composed of austenitic steel containing 18 percent chromium and 8 percent nickel.
  • said shielding means comprising a layer disposed on the upper side of said bottom plate facing the crucible, said layer being composed of a metal having high electric conductivity characteristics.
  • a series of outer upright yokes arranged evenly spaced from each other about the circular exterior of said induction coil, said shielding means comprising a series of bottom yokes, one assigned to each outer yoke, said bottom yokes being disposed in said Crucible radially, each bottom yoke including an outer end portion extending upwardly obliquely and terminating near the lower end of an outer yoke, and each bottom yoke including an inner end portion disposed between said bottom plate and the bottom section of the Crucible.
  • bottom yokes being composed of laminated heat insulated transformer steel sheets.

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)
US375163A 1963-06-20 1964-06-15 Vacuum induction furnace Expired - Lifetime US3303259A (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
US3303259A true US3303259A (en) 1967-02-07

Family

ID=42985349

Family Applications (4)

Application Number Title Priority Date Filing Date
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
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

Family Applications After (3)

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

Country Status (7)

Country Link
US (4) US3303259A (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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3944715A (en) * 1973-04-11 1976-03-16 Brown, Boveri & Cie Aktiengesellschaft Induction crucible furnace
US4583230A (en) * 1983-09-09 1986-04-15 Nippon Steel Corporation Apparatus for induction heating of molten metal
US4969158A (en) * 1986-02-12 1990-11-06 Asea Brown Boveri Inductive heating unit
EP1160529A1 (de) * 2000-05-30 2001-12-05 Daido Tokushuko Kabushiki Kaisha Induktions-Schmelzofen für Vakuumbetrieb
US20130044785A1 (en) * 2011-08-15 2013-02-21 Gerrard HOLMS Electric induction melting assembly

Families Citing this family (20)

* 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
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
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
GB2268103A (en) * 1989-11-09 1994-01-05 Fuji Electric Co Ltd Apparatus for heating molten metal in a ladle including a vacuum container having a cover for receiving the ladle
US5416794A (en) * 1990-01-31 1995-05-16 Inductotherm Corp. Induction furnace havng a modular induction coil assembly
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
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
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
FR3056713B1 (fr) * 2016-09-27 2018-10-19 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
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

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
US3944715A (en) * 1973-04-11 1976-03-16 Brown, Boveri & Cie Aktiengesellschaft Induction crucible furnace
US4583230A (en) * 1983-09-09 1986-04-15 Nippon Steel Corporation Apparatus for induction heating of molten metal
US4969158A (en) * 1986-02-12 1990-11-06 Asea Brown Boveri Inductive heating unit
EP1160529A1 (de) * 2000-05-30 2001-12-05 Daido Tokushuko Kabushiki Kaisha Induktions-Schmelzofen für Vakuumbetrieb
US6537485B2 (en) 2000-05-30 2003-03-25 Daido Tokushuko Kabushiki Kaisha Metal melting apparatus
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

Also Published As

Publication number Publication date
FR1220513A (fr) 1960-05-25
GB1067323A (en) 1967-05-03
DE1268166B (de) 1968-05-16
FR92002E (fr) 1968-09-13
FR92005E (fr) 1968-09-13
FR92003E (fr) 1968-09-13
GB1067326A (en) 1967-05-03
US3300564A (en) 1967-01-24
US3303258A (en) 1967-02-07
AT257185B (de) 1967-09-25
DE1227926C2 (de) 1973-03-08
FR92004E (fr) 1968-09-13
BE649556A (de) 1964-10-16
SE313626B (de) 1969-08-18
US3300565A (en) 1967-01-24
AT257186B (de) 1967-09-25
DE1227926B (de) 1966-11-03
BE649555A (de) 1964-10-16

Similar Documents

Publication Publication Date Title
US3303259A (en) Vacuum induction furnace
US4147506A (en) Method and apparatus for heating coils of strip
US4183508A (en) Metallurgical induction heating apparatus
US1922312A (en) Electric furnace
US4091228A (en) Water cooled shell for electric arc furnaces
US2405236A (en) Electrode sealing means
US3412195A (en) Intermediate furnace barrier
US3743132A (en) Vertical tube furnace for high operating pressure
US3628779A (en) Furnace for heat-treating objects under high pressure
US3775043A (en) Means in furnaces for vacuum-pressure-sintering
US2826624A (en) Vapor shield for induction furnace
US1837031A (en) High frequency induction furnace or heating apparatus
US3811001A (en) Tiltable induction furnace for molten metals
KR900003403B1 (ko) 전자(電磁)펌프
US3372212A (en) Process for producing densified and elongate bodies
SU896358A1 (ru) Индукционна тигельна печь
US3334171A (en) Vacuum furnace
JP2841759B2 (ja) 真空誘導炉
US3790340A (en) Cylindrical elongated furnace for treating material at high temperature in a gaseous atmosphere under high pressure
US2193034A (en) Apparatus for treating materials under reduced pressure
US3107268A (en) Melting furnace
US2125661A (en) Annealing furnace
SU34719A1 (ru) Электрическа печь дл плавки стекла под разрежением
US1418030A (en) Electrically-heated furnace
US4907245A (en) Furnace with convection-free hot zone