EP0252318B1 - Pressure type automatic pouring furnace for casting - Google Patents

Pressure type automatic pouring furnace for casting Download PDF

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Publication number
EP0252318B1
EP0252318B1 EP19870108317 EP87108317A EP0252318B1 EP 0252318 B1 EP0252318 B1 EP 0252318B1 EP 19870108317 EP19870108317 EP 19870108317 EP 87108317 A EP87108317 A EP 87108317A EP 0252318 B1 EP0252318 B1 EP 0252318B1
Authority
EP
European Patent Office
Prior art keywords
molten metal
type automatic
pressure type
set forth
automatic pouring
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
Application number
EP19870108317
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0252318A1 (en
Inventor
Michiharu Kawasaki Steel Corp. Ozawa
Kiyoshi Kawasaki Steel Corp. Shibuya
Fumio Kawasaki Steel Corp. Kogiku
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.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Publication of EP0252318A1 publication Critical patent/EP0252318A1/en
Application granted granted Critical
Publication of EP0252318B1 publication Critical patent/EP0252318B1/en
Expired legal-status Critical Current

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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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/10—Making spheroidal graphite cast-iron
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D39/00—Equipment for supplying molten metal in rations
    • B22D39/06—Equipment for supplying molten metal in rations having means for controlling the amount of molten metal by controlling the pressure above the molten metal

Definitions

  • the present invention relates to a pressure type automatic pouring furnace for casting of the type as indicated in the pre-characterising portion of claim 1.
  • a pressure type automatic pouring furnace for casting of said type is known from BE-A 887 917 representing the most pertinent state of the art.
  • automatic pouring furnaces have become popular as replacements for manual pouring by means of ladle.
  • the automatic pouring furnaces take various systems for pouring the molten metal within the furnaces to casters.
  • pressure type, inclination type, electromagnetic pump type furnaces are available.
  • the pressure type pouring furnaces are known as advantageous in view of pouring accuracy and consumption of electricity.
  • the pressure type automatic pouring furnace for casting comprises a sealingly enclosed molten metal chamber, a molten metal inlet and outlet extending upwardly from a portion of the molten metal chamber in the vicinity of the bottom of the chamber, and a groove type induction heater section communicated with the lower section of the molten metal chamber for heating the molten metal in the chamber.
  • a given base pressure P is introduced into the molten metal chamber for pre- leveling of the molten metal.
  • additional shot pressure A P is introduced into the molten metal chamber for pouring the molten metal to the caster with a given speed which can be controlled by adjusting the magnitude of the shot pressure.
  • the pressure type automatic pouring furnace of the type set forth above is applicable for continuous casting by supplying molten metal continuously or with a given intervals.
  • the conventional pressure type automatic pouring furnace encounters a disadvantage that it requires the molten metal in the molten metal chamber at a level not lower than a minimum level.
  • the minimum level of the molten metal is determined according to the level of the molten metal outlet opening to the molten metal chamber.
  • 30% to 50% to the maximum molten metal amount is required to be maintained within the molten metal chamber.
  • Maintaining more than minimum amount of molten metal to keep the molten metal level higher than the minimum level requires removal of the molten metal in the chamber when the composition of the metal or alloy to use for casting is to be changed. This significantly lowers the yield in casting operation. Especially, when such automatic pouring furnace is used for a casting line in which relatively large number of mutually different alloys are used for casting.
  • Another object of the invention is to provide a pressure type automatic pouring furnace for casting, which successfully avoid possibility of escaping of the pressurized gas from the molten metal chamber.
  • a further object of the invention is to provide a pressure type automatic pouring furnace which has better pressurization characteristics than that of the conventional furnaces.
  • a pressure type automatic pouring furnace in accordance with the present invention, is formed with a molten metal outlet, provided with the features as laid out in the characterizing portion of claim 1.
  • the molten metal chamber is communicated with a groove type induction heater section at a lower section thereof so that the molten metal in the chamber can be effectively heated.
  • the bottom wall of the molten metal outlet is to be declined for a given angle, e.g. 3 ° toward the heating section with respect to the horizontal plane so as to prevent the molten metal from accumulating within the outlet.
  • a pressure type automatic pouring furnace for casting comprises a furnace body defining a chamber for receiving a molten metal, a molten metal inlet defined through a furnace wall and having a first opening opened substantially at the bottom of the chamber, a molten metal outlet defined through the furnace wall and having a second opening exposed to the chamber and located at an elevation lower than the first opening, and a pressure means for introducing a pressure in the chamber for forcing the molten metal within the chamber to the molten metal outlet.
  • the molten metal inlet and outlet are located radially opposite positions.
  • the furnace body has a floor forming the bottom of the chamber, the floor being formed with a stepped down section opposing to the second opening of the molten metal outlet.
  • the second opening has the uppermost section oriented at an elevation substantially corresponding to the general section of the upper surface of the floor.
  • the floor is slanted from the side where the molten metal inlet is formed to the side where the stepped down section is formed.
  • the pressure type automatic pouring furnace further comprises a groove defined in the floor and communicated with the stepped down section, the groove being communicated with a heating means for heating the molten metal.
  • the groove is slanted towards the heating means.
  • the groove is provided a slant angle greater than or equal to 3° with respect to a horizontal plane.
  • the heating means is a groove type induction heating device comprising an electric heater and means defining molten metal path sorrounding the heater and communicated with the goove.
  • the molten metal path defined in the groove type induction heating device is oriented at an elevation lower than the joining section of the groove.
  • the pressure type pouring furnace further comprises a heating means provided beneath the chamber and communicated with the bottom of the chamber.
  • the heating means is a groove type induction heating device comprising an electric heater and means defining molten metal path sorrounding the heater and communicated with the bottom of the chamber. The molten metal path defined in the groove type induction heating device opens to the bottom of the chamber.
  • the pressure means comprises a pressure inlet defined above the chamber for introducing a pressurized gas into the chamber.
  • the pressure type automatic pouring furnace further comprises an auxiliary pressure means associated with the molten metal inlet for introducing a pressurized gas into the chamber through the molten metal inlet.
  • the preferred embodiment of a pressure type automatic pouring furnace has a furnace body 10 defining therein a molten metal chamber 12 by side wall 14 and floor 16.
  • a molten metal inlet path 18 is defined through the side wall 14.
  • the inlet path 18 opens to the molten metal chamber 12 at the inner end thereof.
  • the inner end opening 20 of the inlet path 18 have the lowermost elevation corresponding to the elevation of the upper surface of the floor 16 of the molten metal chamber 12.
  • the inlet path 18 extends upwardly through the side wall 14 of the furnace with a given inclination angle.
  • a closure 22 is provided for sealingly closing the outer end opening 24 of the inlet path 18 in air-tight fashion.
  • a molten metal outlet path 26 is also defined through the side wall 14 of the furnace 10.
  • the outlet path 26 has an inner end 28 opening to the molten metal chamber 12.
  • the outer end 30 of the outlet path 26 communicates with an outlet nozzle 32 in order to pour the molten metal to a caster or casting molding (not shown) therethrough.
  • the inner end 28 of the outlet path 26 has the lowermost elevation lower than that of the general upper surface of the floor 16.
  • the uppermost section of the inner end 28 of the outlet path 26 is positioned at an elevation substantially corresponding to the elevation of the upper surface of the floor 16.
  • a stepped down section 34 is formed on the floor 16 in communication with the inner end 28 of the outlet path 26.
  • the inlet path 18 and the outlet path 26 are located at opposite sides of the furnace 10.
  • the upper surface of the floor 16 is slanted toward stepped down section 34, as indicated by the arrow a in Fig. 2.
  • the stepped down section 34 extends in circumferential direction with a slant angle in a direction 13.
  • the slant angle in p direction in the preferred embodiment, is greater than 3 ° .
  • a groove type induction heater section 36 is provided with the furnace 10.
  • the heater section 36 has an essentially circular molten metal path 38 sorrounding an induction heating device 40, which circular molten metal path is in communication with the lowermost portion of the stepped down section 34 of the floor 16.
  • the upper end of the molten metal chamber 12 is opened and openably closed by means of a closure lid 42.
  • the closure lid 42 sealingly closes the opened upper end of the molten metal chamber 12 in air-tight fashion.
  • the closure lid 42 is provided with a communication path (not shown) to introduce therethrough a pressurized gas.
  • the closure 22 closing the outer end of the inlet path 18 may also have a path for introducing therethrough a pressurized gas. Providing the pressurized gas inlet for the closure 22 should be advantageous to effectively pressurize the molten metal chamber 12 and whereby force the molten metal in the molten metal chamber to the outlet path.
  • the minimum level of the molten metal required is shown in Fig. 4(A).
  • a comparative example is shown in Fig. 4(B).
  • the required amount of the molten metal is to fill only the stepped down section 34. This is clearly smaller than that in the conventional furnace.
  • the effective volume of the molten metal chamber 12 in the furnaces of Figs. 4(A) and 4(B) are the same, e.g. 5.0t, the minimum amount of the molten metal in the inventive furnace of Fig.
  • the molten metal level has to be higher than or equal to the uppermost section of the inlet and outlet paths 18 and 26. Since the molten metal chamber 12 is pressurized, the volume of the molten metal should include amounts to fill the inlet and outlet path for maintaining the molten metal level higher than or equal to the uppermost section of the inner end openings of the inlet and outlet path. Consequently, for the shown example, minimum volume of the molten metal to be required will be 2.7t. In this case, the overall required amout of the molten metal becomes 7.7t.
  • the required minimum amount of the molten metal to be filled in the molten metal chamber become approximately half of that required in the conventional furnace.
  • the induction heating section 36 since the induction heating section 36 is communicated with the stepped down section 34 at the lowermost elevation, heat distribution of the molten metal in the molten metal chamber can be successfully maintained so as to prevent the molten metal from solidifying at the stepped down section 34 opposing the inner end opening 28 of the outlet path 26. That is, as is well known the groove type induction heating device 40 may not have substantial stirring ability. Therefore, heat transmission from the induction heating device to the molten metal in the molten metal chamber 12 generaaly relies on natual convection. This means that the lower temperature molten metal will accumulate at the lower section in the chamber due to difference of the density. If the portion of the stepped down section 34 opposing the inner end opening 28 of the outlet path 26 is located at the lowermost elevation, the lowest temperature part of the molten metal in the molten metal chamber 12 will be accumulated in that portion of the stepped down section.
  • the stepped down section 34 is slanted toward the portion joining with the induction heating section 36, the lowest temperature molten metal flows to the joining section to be introduced into the induction heating system 36 which is located at further lower elevation that that of the joining section. This allows effective heating of the molten metal in the molten metal chamber 12 and thus prevents the molten metal from solidifying in the outlet path during pouring to the caster.
  • additional advantage may be expected that, since the required molten metal mount for maintaining the minimum level is substantially reduced, an electricity required for the induction heating device 40 for heating the molten metal can be reduced correspondingly.
  • the amount of the molten metal to be removed is substantially reduced in comparison with that of the conventional furnace of Fig. 4(B), even when the composition of the metal to be casted was substantially different. This make easier to cast various compositions of metals to be casted by means of the common pouring furnace.
  • the appended table 2 shows average consumed electricities through 3 months while the molten metal has been maintained within the furnace. As will be seen from the table 2, according to the shown embodiment, the consumed electricity can be saved at 10 Kw in comparison with that in the conventional and comparative example of Fig. 4(B).
  • Figs. 6, 7 and 8 show another embodiment of the pressure type automatic pouring furnace according to the invention.
  • the corresponding sections and components common to the foregoing embodiment of Figs. 1 through 3 will be represented by the same reference numerals and thus neglected the detailed discussion in order to avoid redunduncy of discussion and to avoid confusion.
  • the groove type induction heating section 40 is provided beneath the molten metal chamber 12 in the furnace 10.
  • the circular molten metal path 38 communicates with a communication path 52 formed through the bottom of the molten metal chamber 12 directly.
  • the inner end opening 28 of the outlet path 26 is directed to oppose one end of the molten metal path 38 in the induction heating section. Therefore, the molten metal to be introduced into the outlet path 26 may be the one heated by the induction heating section. This may successfully prevent the molten metal in the outlet path from solidifying.
  • the minimum level of the molten metal in the molten metal is that represented by the phantom line 50. Therefore, the minimum amount of the molten metal to maintain the minimum level 50 may be substantially reduced in comparision with that required in the conventional furnace.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
EP19870108317 1986-06-09 1987-06-09 Pressure type automatic pouring furnace for casting Expired EP0252318B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP13191886A JPS62289363A (ja) 1986-06-09 1986-06-09 加圧式注湯炉
JP131918/86 1986-06-09

Publications (2)

Publication Number Publication Date
EP0252318A1 EP0252318A1 (en) 1988-01-13
EP0252318B1 true EP0252318B1 (en) 1990-06-06

Family

ID=15069235

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870108317 Expired EP0252318B1 (en) 1986-06-09 1987-06-09 Pressure type automatic pouring furnace for casting

Country Status (3)

Country Link
EP (1) EP0252318B1 (https=)
JP (1) JPS62289363A (https=)
DE (1) DE3763016D1 (https=)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0661610B2 (ja) * 1989-05-30 1994-08-17 富士電機株式会社 加圧式注湯炉
JPH051085U (ja) * 1991-06-21 1993-01-08 株式会社ニフコ 取付保持具
AT404328B (de) * 1995-03-24 1998-10-27 Rauch Fertigungstech Gmbh Verfahren und vorrichtung zum beschicken von giessmaschinen
ES2143341B1 (es) * 1996-05-06 2000-11-01 Fundacion Inasmet Horno de colada para moldeo automatico perfeccionado.
EP0916435B1 (fr) * 1997-11-18 2003-02-12 Fundacion Inasmet Four de coulée pour moulage automatique
US7396504B2 (en) 2000-06-22 2008-07-08 Hoei Shokai Co., Ltd. Method for supplying molten metal, system for supplying molten metal, producing method for producing aluminum, producing method for producing aluminum molding product, producing method of automobile, transporting vehicle, container, and apparatus for supplying molten metal
US7204954B2 (en) 2000-12-27 2007-04-17 Hoei Shokai Co., Ltd. Container
JP3613686B1 (ja) * 2003-07-25 2005-01-26 日本坩堝株式会社 溶湯運搬用取鍋及び溶湯出湯方法
DE102023106056A1 (de) * 2023-03-10 2024-09-12 Fritz Winter Eisengiesserei Gmbh & Co. Kg NIEDERDRUCKGIEßGEFÄß UND VERFAHREN ZUR STATUSBESTIMMUNG EINES NIEDERDRUCKGIEßGEFÄßES
DE102023106055A1 (de) * 2023-03-10 2024-09-12 Fritz Winter Eisengiesserei Gmbh & Co. Kg NIEDERDRUCKGIEßGEFÄß UND VERFAHREN ZU SEINER HERSTELLUNG

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1488313A (fr) * 1966-04-22 1967-07-13 Ct De Rech S De Pont A Mousson Dispositif perfectionné de commande de poches de coulée de liquides
CH646624A5 (en) * 1980-03-13 1984-12-14 Fischer Ag Georg Process for casting molten metal under the pressure of a protective gas and apparatus for carrying out the process

Also Published As

Publication number Publication date
JPS62289363A (ja) 1987-12-16
DE3763016D1 (de) 1990-07-12
JPH0224184B2 (https=) 1990-05-28
EP0252318A1 (en) 1988-01-13

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