US3790145A - Device in a melting or holding furnace for facilitating the charging thereof - Google Patents

Device in a melting or holding furnace for facilitating the charging thereof Download PDF

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Publication number
US3790145A
US3790145A US00150595A US3790145DA US3790145A US 3790145 A US3790145 A US 3790145A US 00150595 A US00150595 A US 00150595A US 3790145D A US3790145D A US 3790145DA US 3790145 A US3790145 A US 3790145A
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US
United States
Prior art keywords
furnace
charging
charging duct
main space
melting
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
US00150595A
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English (en)
Inventor
K Gering
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.)
GRANGES ESSEN SW AB
Granges Essem AB
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Granges Essem AB
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Filing date
Publication date
Application filed by Granges Essem AB filed Critical Granges Essem AB
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Publication of US3790145A publication Critical patent/US3790145A/en
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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
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/06—Constructional features of mixers for pig-iron
    • 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
    • H05B6/16—Furnaces having endless cores
    • H05B6/20—Furnaces having endless cores having melting channel only
    • 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
    • H05B6/34—Arrangements for circulation of melts
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/02—Stirring of melted material in melting furnaces
    • 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
    • Y10S266/00—Metallurgical apparatus
    • Y10S266/90—Metal melting furnaces, e.g. cupola type

Definitions

  • the present invention relates to melting or holding furnaces and more particularly a device for facilitating the charging of such furnaces.
  • a melting or holding furnace is provided with members for supplying heat to the space in the furnace which is adapted to contain material to be melted, alloyed of held warm.
  • the furnace is also provided with devices allowing discharge of molten material, when said material has reached the desirable condition for casting.
  • the furnace is normally supplied with new material for melting by the charging of the furnace.
  • This new material must be introduced down into the remaining melt, which at times may be difficult, especially if the new material is formed of small pieces or parts with a lower volume weight.
  • the difficulties are further increased due to the surface tension of the melt and the layer of cinder which is generally present over the melt.
  • This new material must then in some manner be forced down into the melt, which has up to the present been performed by manual or mechanical stirring downwards thereof.
  • this work is very hard and disagreeable due to the very high temperature and the development of fumes from the melt.
  • at the melting of scrap more cinder is oftenformed on the surface of the melt, which additionally complicates the stirring of new material down into the melt.
  • the object of the present invention is to provide a melting or holding furnace, which can be charged automatically or at least with less severe manual work in respect of work physiology.
  • the furnace of the invention also pres ents the advantage that by closing the main space of the furnace by means of a cover or the like and providing a high pressure in the main space of the furnace above the surface of the melt, it is possible to raise the level ofthe melt in the charging duct located laterally of the main space.
  • By raising the level in the charging duct right up to the top edge of the charging duct an extremely simple possibility is attained for discharging the cinder, which has been accumulated in the upper portion of the charging duct during the charging of the furnace and during the melting of the new material. The cinder can then be discharged or withdrawn over the edge of the charging duct.
  • the top surface of the molten material in the charging duct is maintained at a high level, so that a stirring device located at the upper portion of the charging duct, e.g., an inductive stirring device, can operate efficiently, even if the quantity of material in the main space of the furnace is relatively small. This fact is of special importance at a low level of the melt in the furnace.
  • the furnace 10 illustrated on the drawing is provided with a heating device at its bottom 11 in the form of an induction coil 12 with a magnetic core 13 surrounded by a channel for molten metal.
  • the furnace is provided with a discharge spout 14, through which molten material can be discharged by tilting the furnace around a horizontal shaft 15.
  • the heating device at the bottom of the furnace has such dimensions that material, which has been charged into the furnace, can be maintained in a molten state both in the main space 16 of the furnace and in a charging duct 17, which is located laterally of the main space of the furnace and connected with the main space at the lower portionthereof.
  • the charging duct 17 has the form of a tube, which extends with its top edge 18 to a level above the surface of the melt in the main space, when said main space is filled to a normal level of operation.
  • the upper portion of the charging duct 17 is comprised of a tubular assembly 19, which is releasably mounted on the furnace 10. During the operation of the furnace this assembly is namely exposed to heavy stress and rapid wear and, therefore, must be replaced at intervals.
  • the assembly 19 may also be provided with an exchangable insert tube, even if not shown on the drawing.
  • the replacable assembly comprises a coil 20, the axis of which coincides with the longitudinal axis of the charging duct 17, so as to allow inductive stirring of at least the upper portion of the melt in the charging duct, so that material supplied into the charging duct may be carried down into the melt more easily.
  • Said coil is supplied with AC of a suitable frequency and operates on the basis of the electrodynamic force (the pinch effect).
  • the top edge 18 of the-charging duct 17 is formed with a spout 21 for allowing the discharge of the cinder, which has been accumulated in the upper portion of the charging duct.
  • the main space 16 of the furnace is closed by a cover I 22, in which an aperture 23 is provided for the connection of the space 24 above the melt with a pressure source (not shown) with a controllable pressure.
  • a pressure source (not shown) with a controllable pressure.
  • the furnace illustrated on the drawing is a so-called channel furnace, a channel 25 being provided, wherein molten metal is accumulated and heated, when the furnace is in operation.
  • This channel forms a closed secondary winding around the magnetic core 13, which is located in the induction coil.
  • electrically conducting material e.g., a metal.
  • a certain residual quantity of the melt must thus always be left in the furnace so that it can be started again.
  • the level of the ity of the inductive stirring device for stirring the melt in the charging duct so that the newly supplied material is easily ca'rried downwards into the melt and thereby is more rapidly molten.”
  • the heat supply to the'charging' duct should be of such a value that small pieces or small parts fed into the charging duct are molte'n at least in respect of their surface layer during the transport of .the parts down into the melt, before they ajreach the ⁇ ,point'at which the charging ductt'urns'so.i'asto' openinto the main space of the furnace; Bye-such, aevalrls theadvantage is attained that all the cinder which 'is'formedat the melting of such parts will be, accumulated on the surface of the melt in the chargingdut'and is notintroduced into the main space of the, furnace
  • aboire ijli furnace shown is of the channel type but is tunder s'tood that the present invention may be appliedin -a furnace of any type.
  • heating device has been shown but it is evident that a pluralityof such heating devices may be arranged, either of the inductivetype or of any other type, along the bottom ofthefurnace or at an other suitable location in gonnec tionwith the main space of the furnace. It is onlyof importance that a sufficient quantity of heat is supplied to' the mainspace and the charging duct of the furnace.
  • the discharge of the-melt 2i A furnace as set forth in claim 1 in which the inductive" stirring device comprises a coil positioned from the main space of the furnace may, of course, also be perfon'ned in many other ways than through a discharge channel of the type shown on the drawing and if required a plurality of charging ducts may be provided.
  • a melting or holding furnace having an improved charging means, said furnace comprising a. a main space having heating means located in the lower portion thereof for melting, alloying or warm holding of a quantity of material contained therein, b. at least one vertically extending charging duct located externally of said main space, 0. the lower portion of said main space being in communication with the lower end of each said charging duct, d.'the upper portion of each said charging duct being providedwith inductive stirring means for stirring the material charged thereto and moving same downwardly toward said main space.
  • each charging duct in releasably mounted on the furnace so that it. can be replaced after excessive wear.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Furnace Details (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)
US00150595A 1970-06-10 1971-06-07 Device in a melting or holding furnace for facilitating the charging thereof Expired - Lifetime US3790145A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8065/70A SE342900B (enrdf_load_stackoverflow) 1970-06-10 1970-06-10

Publications (1)

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US3790145A true US3790145A (en) 1974-02-05

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US00150595A Expired - Lifetime US3790145A (en) 1970-06-10 1971-06-07 Device in a melting or holding furnace for facilitating the charging thereof

Country Status (9)

Country Link
US (1) US3790145A (enrdf_load_stackoverflow)
AT (1) AT311692B (enrdf_load_stackoverflow)
CA (1) CA955987A (enrdf_load_stackoverflow)
CH (1) CH523486A (enrdf_load_stackoverflow)
DE (1) DE2128742A1 (enrdf_load_stackoverflow)
DK (1) DK129542B (enrdf_load_stackoverflow)
FR (1) FR2101474A5 (enrdf_load_stackoverflow)
GB (1) GB1354181A (enrdf_load_stackoverflow)
SE (1) SE342900B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4332373A (en) * 1980-05-14 1982-06-01 Thermatool Corp. Solder pot with replenisher and skimmer
US4571258A (en) * 1983-05-26 1986-02-18 Alcan International Limited Recovery of aluminium scrap
US4933005A (en) * 1989-08-21 1990-06-12 Mulcahy Joseph A Magnetic control of molten metal systems
US5119977A (en) * 1989-07-25 1992-06-09 Weber S.R.L. Continuous semi-liquid casting process and a furnace for performing the process
US5385338A (en) * 1992-04-24 1995-01-31 Miyamoto Kogyosho Co., Ltd. Apparatus for melting aluminum alloy scraps
US5882582A (en) * 1994-10-31 1999-03-16 Seva Chalon-Sur-Saone Liquid metal heating and casting ladle
US6311629B1 (en) * 1997-08-13 2001-11-06 Linde-Kca-Dresden-Gmbh Process and device for gasification of waste
US20060133194A1 (en) * 2004-12-22 2006-06-22 Kenzo Takahashi Agitator, agitating method, and melting furnace with agitator

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8308449D0 (en) * 1983-03-28 1983-05-05 Alcan Int Ltd Melting scrap metal
GB2232751A (en) * 1989-06-06 1990-12-19 Christopher J English Apparatus and method for treating molten material
DE19805644C2 (de) 1998-02-12 2001-03-22 Induga Industrieoefen Und Gies Verfahren und Induktionsofen zum kontinuierlichen Schmelzen von kleinstückigem Metall- und/oder metallhaltigem Schüttgut

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1674947A (en) * 1925-12-10 1928-06-26 New Jersey Zinc Co Metallurgical furnace
US2191337A (en) * 1938-12-08 1940-02-20 Gen Electric Melting apparatus
US2464714A (en) * 1945-12-28 1949-03-15 Chase Brass & Copper Co Intermittent discharge induction melting furnace
US3088182A (en) * 1958-07-10 1963-05-07 Ajax Magnethermic Corp Furnace
US3341092A (en) * 1964-09-01 1967-09-12 Harbison Walker Refractories Nozzle construction with thermally expanding refractory insert
US3343828A (en) * 1962-03-30 1967-09-26 Air Reduction High vacuum furnace
US3441261A (en) * 1966-03-11 1969-04-29 Ajax Magnethermic Corp Constant level holding furnaces

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1674947A (en) * 1925-12-10 1928-06-26 New Jersey Zinc Co Metallurgical furnace
US2191337A (en) * 1938-12-08 1940-02-20 Gen Electric Melting apparatus
US2464714A (en) * 1945-12-28 1949-03-15 Chase Brass & Copper Co Intermittent discharge induction melting furnace
US3088182A (en) * 1958-07-10 1963-05-07 Ajax Magnethermic Corp Furnace
US3343828A (en) * 1962-03-30 1967-09-26 Air Reduction High vacuum furnace
US3341092A (en) * 1964-09-01 1967-09-12 Harbison Walker Refractories Nozzle construction with thermally expanding refractory insert
US3441261A (en) * 1966-03-11 1969-04-29 Ajax Magnethermic Corp Constant level holding furnaces

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4332373A (en) * 1980-05-14 1982-06-01 Thermatool Corp. Solder pot with replenisher and skimmer
US4571258A (en) * 1983-05-26 1986-02-18 Alcan International Limited Recovery of aluminium scrap
US5119977A (en) * 1989-07-25 1992-06-09 Weber S.R.L. Continuous semi-liquid casting process and a furnace for performing the process
US4933005A (en) * 1989-08-21 1990-06-12 Mulcahy Joseph A Magnetic control of molten metal systems
US5385338A (en) * 1992-04-24 1995-01-31 Miyamoto Kogyosho Co., Ltd. Apparatus for melting aluminum alloy scraps
US5882582A (en) * 1994-10-31 1999-03-16 Seva Chalon-Sur-Saone Liquid metal heating and casting ladle
US6311629B1 (en) * 1997-08-13 2001-11-06 Linde-Kca-Dresden-Gmbh Process and device for gasification of waste
US20060133194A1 (en) * 2004-12-22 2006-06-22 Kenzo Takahashi Agitator, agitating method, and melting furnace with agitator
US8158055B2 (en) * 2004-12-22 2012-04-17 Kenzo Takahashi Melting furnace with agitator

Also Published As

Publication number Publication date
FR2101474A5 (enrdf_load_stackoverflow) 1972-03-31
CH523486A (de) 1972-05-31
SE342900B (enrdf_load_stackoverflow) 1972-02-21
CA955987A (en) 1974-10-08
DK129542C (enrdf_load_stackoverflow) 1975-03-10
GB1354181A (en) 1974-06-05
DE2128742A1 (de) 1971-12-16
DK129542B (da) 1974-10-21
AT311692B (de) 1973-11-26

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