EP0595103B1 - Creuset compressible avec un revêtement réfractaire et un bassin moulé attaché - Google Patents

Creuset compressible avec un revêtement réfractaire et un bassin moulé attaché Download PDF

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Publication number
EP0595103B1
EP0595103B1 EP93116478A EP93116478A EP0595103B1 EP 0595103 B1 EP0595103 B1 EP 0595103B1 EP 93116478 A EP93116478 A EP 93116478A EP 93116478 A EP93116478 A EP 93116478A EP 0595103 B1 EP0595103 B1 EP 0595103B1
Authority
EP
European Patent Office
Prior art keywords
melt
casting
basin
pouring basin
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 - Lifetime
Application number
EP93116478A
Other languages
German (de)
English (en)
Other versions
EP0595103A1 (fr
Inventor
Erwin Dötsch
Horst Gillhaus
Uwe Komp
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.)
Krupp Stahl AG
ABB Patent GmbH
Fried Krupp AG
Original Assignee
Krupp Stahl AG
ABB Patent GmbH
Fried Krupp AG
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 Krupp Stahl AG, ABB Patent GmbH, Fried Krupp AG filed Critical Krupp Stahl AG
Publication of EP0595103A1 publication Critical patent/EP0595103A1/fr
Application granted granted Critical
Publication of EP0595103B1 publication Critical patent/EP0595103B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22D39/00—Equipment for supplying molten metal in rations

Definitions

  • the invention relates to a fire-resistant lined, pressurized boiler with an upstream casting basin according to the preamble of claim 1.
  • Automation progressing in the foundry often includes the casting process itself.
  • the automated casting systems have two main functions at the interface between mold and melt production, namely to keep the melt ready for casting and to bring it into the mold according to requirements.
  • Induction-heated casting vessels for the more or less complete solution of the tasks set by the two functions are generally known.
  • the principle of the pressure-tight channel furnace with stopper dosing has proven itself, which essentially consists of a cylindrical, fire-resistant lined boiler with a pressure-tight lid, a flanged one Channel inductor, a casting basin with stopper device and a pressure control system. The filling and emptying takes place via siphon-shaped channels that open into the boiler on the bottom.
  • Compressed gas presses the melt from the inductively heated furnace boiler into the casting basin, the outlet opening of which can be closed with the stopper.
  • the level of the melt in the casting basin is kept at a constant level with the pressure gas in the case of different boiler contents.
  • the stroke of the stopper and the diameter of the outlet opening determine the casting performance, i.e. the amount of melt flowing out per unit of time.
  • the general aim is to pour the melt from the casting furnace directly into the mold without additional equipment.
  • inoculants are added to the melt to be poured in order to optimize the carbon excretion occurring during the solidification of the melt.
  • the effect of this vaccination process is more intense the shorter it takes place before the pouring process.
  • the most effective method has been found in practice to add the inoculants to the pouring stream between the pouring basin and the mold funnel during the pouring process. This is done either by weight-metered input of granular inoculants by gravity or carrier gas in a downpipe or by winding in a steel jacket wire filled with inoculants.
  • the limits of this process are reached when high demands are placed on the inoculant concentration per volume element of the melt, which is constant over the entire casting process, and on quality assurance.
  • the amount of inoculant can only be adapted to the melt flow, which varies according to the swallowing capacity of the casting mold, with a comparatively large tolerance, and the vaccinated melt can only be sampled with the aid of a test specimen in the casting mold.
  • the inoculants or alloying agents are usually introduced into the casting basin using a filler wire from the melt.
  • this method has the disadvantage that the amount of melt to be inoculated or alloyed in the casting basin cannot be exactly defined by the fact that there is an uncontrollable connection between the casting basin and the furnace via the siphon channel, through which the added substances can volatilize. Because the precisely metered amount of inoculant or alloying agent is offset by an undefinable amount of melt, this process usually leads to impermissibly strongly fluctuating concentrations of the alloyed substances in the melt.
  • the problem is solved by installing so-called intermediate pans.
  • the melt is usually poured into the tundish from the casting furnace in a weight-dosed manner; at the same time, the inoculants or alloying substances are added in such a way that a homogeneously inoculated and alloyed melt is available in the tundish for the next casting.
  • a sample for quality assurance can also be taken from this finished melt at any time.
  • such intermediate ladle systems have the disadvantages that they are relatively complex, that they lead to additional heat and burn-up losses, that they require additional maintenance and operating expenses, and that they make the casting system more difficult to handle when production is interrupted.
  • the invention has for its object to provide a fire-resistant lined, pressurized boiler with an upstream casting basin of the type mentioned, with which an exact and constant concentration of inoculant or alloying agent per volume element of the melt can be achieved without great effort.
  • the advantages that can be achieved with the invention are in particular that a high quality of the melt is achieved, since the dissolution, homogenization, concentration and Effect of the inoculant or alloying agent are optimal.
  • the melt located in the front casting basin can be treated separately with inoculants or alloying agents.
  • untreated melt is refilled from the rear pouring basin into the front pouring basin. Alternatively, this can be done by deliberately overflowing the untreated melt over the dividing wall or a closable opening in the dividing wall itself.
  • Samples can be taken directly from the easily accessible front pouring basin.
  • the inoculants or alloying agents cannot get into the boiler, even if the production is interrupted with subsequent pressure relief. This means that there can be no additional build-up in the siphon channel and inaccurate initial state of the melt when production is resumed.
  • the fireproof-lined, pressurized boiler with an upstream pouring basin enables the use of the advantages of the tundish described above while avoiding the disadvantages otherwise associated with tundish, such as additional heat and burnup losses, additional maintenance and operating expenses and difficult handling of the casting system when production is interrupted.
  • FIG. 1 shows a casting furnace with a first variant of a casting basin.
  • a casting furnace 1a with a pressure-tight cover 1b can be seen, on the siphon channel 9 of which a casting basin 2 is mounted via a flange connection 2c.
  • Casting furnace 1a and lid 1b are also generally referred to as fire-resistant lined, pressurized boilers.
  • the pouring basin 2 is divided into two parts by means of a refractory partition 3 into a rear pouring basin 2a connected to the siphon channel 9 and a front pouring basin 2b provided with an outlet opening 2d.
  • the outlet opening 2d can be opened or closed by means of a stopper 6, so that a casting mold 10 can be filled with melt in a metered manner.
  • the directions of movement of the plug 6 are indicated by arrows C.
  • Arrows A indicate that the bath level of the melt in the casting basin 2 can generally be adjusted and regulated by pressurizing the melt surface in the casting furnace 1a.
  • the alloy dosing system or inoculant dosing system 12 is indicated. It can also be seen that level measuring devices 13 and 14 are provided for detecting the current bath level of the melt of the rear pouring basin 2a and the front pouring basin 2b.
  • the melt B in the rear casting basin 2a in front of the partition 3 is raised to the bath level 4a by increasing the pressure in the casting furnace 1a, so that the front casting basin 2b up to a predetermined bath level 5a by overflowing the melt over the partition 3 is filled.
  • the plug 6 is closed.
  • the filling process of the front casting basin 2b is ended by lowering the pressure in the casting furnace 1a, as a result of which the bath level in the rear casting basin 2a drops to the predetermined bath level 4b.
  • the bath levels 5a and 4a or 4b are replaced by suitable ones Measuring devices 13, 14 are monitored and the bath level 4b or 4a is set by a predetermined differential pressure in the casting furnace 1a.
  • the melt located in the front casting basin 2b is treated by metered addition of inoculants or alloying agents.
  • the casting process into the casting mold 10 then takes place by suitable actuation of the stopper 6.
  • the front casting basin 2b is dimensioned such that after the quantity to be poured, which is controlled by hand or an electronic casting system, a sump with the bath level 5b remains in the front casting basin 2b , so that the slag on the bath surface cannot flow into the casting mold.
  • the front pouring basin 2b is filled again with the precisely defined melt corresponding to the previously poured pouring quantity to the specified bath level 5a.
  • the inoculants and alloys are added, depending on the specific weight in wire or granulate form; their quantity is determined by the last poured casting weight or by the measured bath level difference 5a / 5b.
  • the rear casting basin 2a is emptied by lowering the pressure in the casting furnace 1a by the melt B flowing back into the casting furnace.
  • the treated melt in the front casting basin 2b is emptied into a prepared pan after actuation of the stopper 6.
  • FIG. 2 shows a casting furnace with a second variant of a casting basin.
  • the refractory partition 3 has an opening 7 in its lower part, which has a plug 8a can be locked.
  • the plug suspension 8b is indicated.
  • the directions of movement of the plug 8a (lateral pivoting movement) are marked with arrows D.
  • the treatment and pouring processes are as follows: At the start, the plug 8a is in the open position, so that both the rear pouring basin 2a and the front pouring basin 2b are filled by increasing the pressure in the pouring furnace 1a when the plug 6 is closed. After reaching the predetermined fill level 11 in the entire casting basin 2, the stopper 8a is closed, so that the melt now located in the front pouring basin 2b can be treated as a defined amount by adding inoculants or alloying substances.
  • the casting process into the casting mold 10 then takes place by corresponding actuation of the stopper 6, analogously to the sequence described above.
  • the stopper 8a is opened so that the melt can flow from the rear pouring basin 2a and the pouring furnace 1a into the front pouring basin 2b until the predetermined filling level 11 is reached again.
  • the inoculants and alloys are added, likewise in the same way as described above.
  • both the rear pouring basin 2a and the front pouring basin 2b can be emptied by lowering the pressure in the pouring furnace 1a, in that the melt flows back into the pouring furnace.
  • the plug 8a must be opened for the emptying process. If, however, the already treated melt in the front casting basin 2b is not to be mixed with the untreated melt in the casting furnace 1a, the stopper 8a remains closed and the treated melt in the front casting basin 2b becomes active after actuation the plug 6 emptied into a prepared pan.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Claims (5)

  1. Creuset (1a) sous pression à revêtement réfractaire pour la préparation de bain de fusion (B), comportant un bassin de coulée (2) qui est relié au creuset par l'intermédiaire d'un canal-siphon (9), caractérisé par le fait que le bassin de coulée (2) est divisé par une paroi (3) de division réfractaire de manière à former un bassin de coulée (2b) antérieur, pourvu d'un orifice de sortie (2d) obturable permettant un traitement séparé du bain de fusion (B) à l'aide d'agents inoculants et de produits d'alliage.
  2. Creuset selon la revendication 1, caractérisé par un agencement de la paroi de séparation (3) et du bassin de coulée (2) tel, que le remplissage du bassin de coulée antérieur (2b) avec le bain de fusion (B) a lieu par élévation du niveau du bain dans le bassin de coulée postérieur (2a) et par débordement du bain de fusion au-dessus de la paroi de séparation (3).
  3. Creuset selon la revendication 1, caractérisé par le fait que la paroi de séparation (3) est pourvue d'une ouverture (7) adaptée pour l'écoulement du bain de fusion (B), qui peut être fermée à l'aide d'un obturateur (8a) réfractaire.
  4. Creuset selon la revendication 3, caractérisé par un bouchon (8a) en tant qu'obturateur.
  5. Creuset selon l'une des revendications 1 à 4, caractérisé par le fait que des dispositifs (13, 14) de mesure de niveau sont prévus pour la mesure indépendante des niveaux (4a, 4b, 5a, 5b, 11) du bain dans les bassins postérieur et antérieurs (2a, 2b).
EP93116478A 1992-10-14 1993-10-12 Creuset compressible avec un revêtement réfractaire et un bassin moulé attaché Expired - Lifetime EP0595103B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4234492A DE4234492A1 (de) 1992-10-14 1992-10-14 Feuerfest ausgekleideter, druckbeaufschlagter Kessel mit vorgelagertem Gießbecken
DE4234492 1992-10-14

Publications (2)

Publication Number Publication Date
EP0595103A1 EP0595103A1 (fr) 1994-05-04
EP0595103B1 true EP0595103B1 (fr) 1997-01-22

Family

ID=6470356

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93116478A Expired - Lifetime EP0595103B1 (fr) 1992-10-14 1993-10-12 Creuset compressible avec un revêtement réfractaire et un bassin moulé attaché

Country Status (3)

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EP (1) EP0595103B1 (fr)
DE (2) DE4234492A1 (fr)
ES (1) ES2099341T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2745736A1 (fr) * 1996-03-07 1997-09-12 Hugot Pierre Four de maintien en temperature ou de fusion-maintien d'un metal ou d'un alliage non ferreux, et d'alimentation d'une machine a mouler sous pression
DE19832192B4 (de) * 1998-07-17 2010-11-04 Audi Ag Gussanlage sowie Verfahren zur Zuführung von Metallschmelze zu einer Füllkammer einer Gussanlage
CN102200392B (zh) * 2005-04-26 2013-01-16 技术资源有限公司 前炉
AU2006239733B2 (en) * 2005-04-26 2011-09-22 Technological Resources Pty. Limited Forehearth

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659121A (en) * 1952-06-05 1953-11-17 Continuous Metalcast Co Inc Pouring box for continuous casting machines
DE1953131A1 (de) * 1969-10-22 1971-04-29 Hermann Zepernik Verfahren zum Dosieren von fluessigen Metallmengen
SE418991B (sv) * 1978-01-24 1981-07-06 Asea Ab Rennugn med vakuumsug
DE3629231A1 (de) * 1986-08-28 1988-03-03 Heliotronic Gmbh Verfahren zum aufschmelzen von in einen schmelztiegel chargiertem siliciumpulver und schmelztiegel zur durchfuehrung des verfahrens
JP2827126B2 (ja) * 1989-11-25 1998-11-18 住友重機械工業株式会社 溶湯・溶滓の連続排出方法及びその装置

Also Published As

Publication number Publication date
EP0595103A1 (fr) 1994-05-04
DE59305235D1 (de) 1997-03-06
DE4234492A1 (de) 1994-04-21
ES2099341T3 (es) 1997-05-16

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