EP0104392B1 - Method of producing nodular iron and a machine for the implementation thereof - Google Patents

Method of producing nodular iron and a machine for the implementation thereof Download PDF

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Publication number
EP0104392B1
EP0104392B1 EP83107982A EP83107982A EP0104392B1 EP 0104392 B1 EP0104392 B1 EP 0104392B1 EP 83107982 A EP83107982 A EP 83107982A EP 83107982 A EP83107982 A EP 83107982A EP 0104392 B1 EP0104392 B1 EP 0104392B1
Authority
EP
European Patent Office
Prior art keywords
tundish
processing
runner
iron
furnace
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
EP83107982A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0104392A1 (en
Inventor
Franco Zanardi
Nerio Bonato
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0104392A1 publication Critical patent/EP0104392A1/en
Application granted granted Critical
Publication of EP0104392B1 publication Critical patent/EP0104392B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/08—Making cast-iron alloys
    • C22C33/10—Making cast-iron alloys including procedures for adding magnesium

Definitions

  • This invention relates to a method of producing nodular iron and to a machine for the implementation thereof.
  • One approach provides for iron processing in a so-called tundish cover system, wherein the molten iron collecting pot associated with the cover has the function of preventing air from undesirably getting into the tundish interior during the treatment step.
  • the problem may be overcome by using a suitable intermediate transfer tundish arranged to tap the iron from the furnace and pour it into the processing tundish.
  • Another object of the invention is to provide a method and a machine as indicated, which can afford a reduction in the amount of spheroidizing alloy required to accomplish the reaction, and accordingly, in the cost of the nodular iron thus produced.
  • Still another object of the invention is to provide a nodular iron making machine which can eliminate the problem of air pollution by minimizing the release of fumes during the graphite spheroidization reaction.
  • a not unimportant object of the invention is to provide such a machine which can afford significant power savings.
  • the invention objects are achieved by a method of producing nodular iron, comprising the steps of:
  • a preferred machine for implementing the above method comprises a pressure tap stationary furnace defining an iron runner, and is characterized in that detachably associated with the bottom portion of said runner is a processing tundish closed at the top by a cover, said tundish and said runner being fluid-wise interconnected and held in mutual contact relationship by a means of handling said processing tundish.
  • the machine generally comprises a pressure tap stationary furnace including essentially a closed crucible 1 fluid-wise connected, in a manner known perse,to a pressurized gaseous medium supply device, not shown, which communicates with the outside environment through an inlet line 2 and outlet line 3.
  • the outlet line 3 defines, at the top portion thereof, a runner 4 having a sprue 5 wherethrough the molten iron is allowed to flow during the cast.
  • a processing tundish 6 closed at the top by a cover 7, which is preferably hinged to the tundish and provided at the middle region thereof with a channel allowing the molten iron to flow from the runner into the tundish.
  • the cover 7 Coaxially with the channel 8, outwardly with respect to th e tundish, the cover 7 has an abutment ring 9 for a gasket 10 which is formed from a heat resisting material and intended to prevent air from getting into the tundish during the spheroidization process.
  • a means of moving the tundish 6, associated with the tundish itself which comprises essentially a bed 11 having rigidly mounted thereon a front frame 12 provided with a pair of vertical uprights 13, each defining, along a portion of its length, a guide 14 engaging a front guiding device 15 connected to the tundish.
  • a pair of fluid-operated cylinders 16 the opposed ends whereof are pivoted to the bed 11 such as to permit the tundish to be moved along a path guided by the front guiding device 15 and a rear wheel 17 which is movable along a rear guide 18, also rigid with the bed 11.
  • the guide 18 has of preference a first sloping zone 19, intended for tilting the tundish during the slagging step, which is followed by a substantially vertical portion 20 along which the wheel 17 can roll as the tundish is being brought to mate with the iron runner, and extends then into a substantially curvilinear portion 21 operative to guide the tundish along its path during the overturning steps ' explained hereinafter.
  • Hinged to the frame top is a shaped rod 22 having a counterweight 23 which holds the cover in the proper position during the cited tundish overturning steps.
  • a detent 24 which, during the steps of lowering the tundish down to the lowermost zone, will partly raise the cover 7 to facilitate the slagging operations, by protecting the operator against radiating heat, or to allow manual introduction of the spheroidizing alloy.
  • a filling probe 25 into the processing tundish which is responsive to the level of iron in the tundish and drives the admission of a gaseous medium into the closed crucible 1 such as to establish, upon filling of the processing tundish, a sufficient pressure within the crucible to maintain the metal standby level shown in Figure 5, that is, immediately below the iron runner, or completely releases the pressure from the crucible inside so as to equalize the levels in the crucible and inlet and outlet channels.
  • the bed 11 is carried on a carriage 26 so as to enable quick transportation of the processing tundish from the zone underlying the furnace 1 to the transfer zone into a casting ladle 27, shown in Figure 7.
  • Shown in Figure 8 is a detail of the runner- processing tundish assembly, wherewith there is associated a means for introducing spheroidizing alloy on a continuous basis during the casting of molten iron into the processing tundish; said means comprises essentially an intake chamber 30 . containing a feeder of spheroidizing alloy 31.
  • a hole 32 for charging spheroidizing alloy into the feeder is protected by a movable cover 33 effective to prevent fumes from escaping out of the chamber 30.
  • the intake chamber is further provided, at the bottom portion thereof, with a charging hopper 34 which extends through the iron runner with a tubular element 35 extending coaxially with the sprue 5 and runner 8 to open to the interior of the processing tundish.
  • a probe 36 for detecting the level of the molten iron which is located in the iron runner and acts on the feeder 31, so as to initiate the introduction of spheroidizing alloy through the tubular extension 35, short after the casting of the iron into the tundish has been started so that the iron runner and the tundish pouring siphon are covered with molten iron prior to the starting of the reaction, thus preventing fumes from escaping through the runner and siphon, during the initial phase.
  • FIG. 9 A preferred embodiment of the means for introducing spheroidizing alloy continuously during the cast is shown in Figure 9, wherein the cover 33 is replaced with a feeder hopper 37, e.g. of the vibrating extractor type, which, under the control by a logic circuit not shown, dispenses spheroidizing alloy to the feeder, e.g. also of the vibratory type and being mounted on a weighing cell 38 which, upon reaching the weight, sends a command to interrupt the flow of spheroidizing alloy to the feeder hopper.
  • a feeder hopper 37 e.g. of the vibrating extractor type
  • dispenses spheroidizing alloy to the feeder e.g. also of the vibratory type and being mounted on a weighing cell 38 which, upon reaching the weight, sends a command to interrupt the flow of spheroidizing alloy to the feeder hopper.
  • the method of producing nodular iron according to the invention comprises the following steps:
  • a body of molten iron is collected into the pressure tap stationary furnace.
  • a preset amount of spheroidizing alloy is charged into the processing tundish.
  • the inventive machine is equipped with a means for introducing spheroidizing alloy continuously during the iron casting into the processing tundish, the admission of spheroidizing alloy to the tundish may be delayed until after the cast has begun with a further improvement of the uniform admixing of the spheroidizing alloy to the iron body, which enables a further reduction in the undesired oxidation of the magnesium with attendant saving of spheroidizing alloy and smoother reaction.
  • the following step provides for the mating of the tundish to the stationary furnace, which is performed by placing the tundish into fluid communication with the furnace such that the top portion of the tundish cover, and specifically the ring 9, can mate with the bottom portion of the iron runner to communicate the runner to the inside of the tundish through the sprue 5 and channel 8.
  • the fluid-operated cylinders 16 hold the ring 9 in constant contact with the gasket 10, thus providing an airtight seal.
  • gaseous medium must be blown into the furnace crucible to raise the level of the molten iron in the inlet and outlet channels, conveying it toward the runner.
  • the level in the runner may be maintained directly by the cited probe, which in addition to controlling the admission of spheroidizing alloy, preferably in granulate form, also drives the metering of gaseous medium into the crucible so as to keep always full the iron runner during the process.
  • the flow of molten iron through the iron runner is interrupted by discontinuing the admission of gaseous medium into the crucible.
  • the tundish is then lowered by means of the fluid-operated cylinders 16 and placed in the slagging position as shown in Figure 6.
  • the detent 24 and wheel 17 acting on the rear guide cause a simultaneous opening of the cover and tilting of the tundish so as to allow the succession of the slagging operations with the operator fully protected from the heat.
  • the tundish can be easily transported to the transfer zone where the nodular iron is poured into a casting ladle.
  • the materials used, as well as the dimensions may be any ones contingent on requirements and the state of the art.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
EP83107982A 1982-08-26 1983-08-12 Method of producing nodular iron and a machine for the implementation thereof Expired EP0104392B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT23006/82A IT1153176B (it) 1982-08-26 1982-08-26 Procedimento per la fabbricazione di ghisa sferoidale e macchina per l'applicazione del procedimento stesso
IT2300682 1982-08-26

Publications (2)

Publication Number Publication Date
EP0104392A1 EP0104392A1 (en) 1984-04-04
EP0104392B1 true EP0104392B1 (en) 1986-10-15

Family

ID=11202789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83107982A Expired EP0104392B1 (en) 1982-08-26 1983-08-12 Method of producing nodular iron and a machine for the implementation thereof

Country Status (5)

Country Link
EP (1) EP0104392B1 (es)
DE (1) DE3366965D1 (es)
ES (1) ES525095A0 (es)
IT (1) IT1153176B (es)
ZA (1) ZA836249B (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60232383D1 (de) * 2001-03-14 2009-06-25 Ibiden Co Ltd Mehrschichtige Leiterplatte

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB765423A (en) * 1954-03-06 1957-01-09 Mond Nickel Co Ltd Improvements in methods of and apparatus for the treatment of molten iron and steel
DE1408860A1 (de) * 1960-08-13 1968-10-10 Jochem Thieme Verfahren zur Herstellung von Gusseisen mit Kugelgraphit
DE1209134B (de) * 1964-07-08 1966-01-20 Standard Messo Duisburg Vorrichtung zur Vakuumbehandlung fluessiger Metalle
US3414250A (en) * 1967-07-31 1968-12-03 American Cast Iron Pipe Co Ladle for use in treatment of molten metal
GB1203339A (en) * 1968-07-05 1970-08-26 Ts Ktb Apparatus for molten metal inoculation
CA1178014A (en) * 1981-02-02 1984-11-20 Igor Y. Khandros Foundry practices

Also Published As

Publication number Publication date
ZA836249B (en) 1984-11-28
ES8501448A1 (es) 1984-12-01
DE3366965D1 (en) 1986-11-20
IT8223006A0 (it) 1982-08-26
EP0104392A1 (en) 1984-04-04
IT1153176B (it) 1987-01-14
ES525095A0 (es) 1984-12-01

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