EP0599750A1 - Verfahren zum automatischen Einblasen von Gas in den Kokillen-Aufsatz einer Multistranggiessanlage - Google Patents

Verfahren zum automatischen Einblasen von Gas in den Kokillen-Aufsatz einer Multistranggiessanlage Download PDF

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Publication number
EP0599750A1
EP0599750A1 EP93420463A EP93420463A EP0599750A1 EP 0599750 A1 EP0599750 A1 EP 0599750A1 EP 93420463 A EP93420463 A EP 93420463A EP 93420463 A EP93420463 A EP 93420463A EP 0599750 A1 EP0599750 A1 EP 0599750A1
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EP
European Patent Office
Prior art keywords
pressure
gas
flow
casting
ingot
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.)
Withdrawn
Application number
EP93420463A
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English (en)
French (fr)
Inventor
Laurent Jouet-Pastre
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.)
Rio Tinto France SAS
Original Assignee
Aluminium Pechiney SA
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 Aluminium Pechiney SA filed Critical Aluminium Pechiney SA
Publication of EP0599750A1 publication Critical patent/EP0599750A1/de
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/07—Lubricating the moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0401—Moulds provided with a feed head

Definitions

  • the present invention relates to an automated gas injection process in a multi-cast metal installation fitted with raised molds.
  • the height of metal in the riser is always less than or equal to 100 mm and that, in addition to the gas, a lubricant is continuously introduced into the ingot mold, the flow rate of which can be related to that some gas.
  • European patent 449771 also describes in an installation comprising several ingot molds with extension fitted with a continuous supply by lubricating a casting process "characterized in that air or an inert gas are brought under a slight overpressure identical in all ingot molds using a main pipe having several distribution pipes, the relative pressure between a desired value is determined calculated by a programmer as a function of the metal level H1 detected using a level gauge and the actual value measured in the pipeline by means of a pressure transducer, the so-called pressure relating to regulation and control is used, the control function being ensured by means of a processor by emission of a signal to an actuator which controls a pressure regulating valve placed on the pipeline ".
  • the aim of the applicant was, in the context of multi-casting with enhancement and automated gas injection, to develop a process applicable in the case of a compact installation and which does not necessarily require a continuous supply of lubricant.
  • a compact installation is an installation where a large number of ingot molds are used per unit of floor space.
  • the compactness is an already very interesting characteristic in the case of a new installation, because it makes it possible to reduce the installation costs.
  • a first case of renovation very frequent, consists in replacing on an existing installation the so-called "classic" casting process with metal supply of the molds by nozzle and float, by a loaded casting process which has a certain number of advantages. well known compared to the conventional method. Naturally, this renovation operation should not be accompanied by a reduction in production capacity. However, the tables of the conventional casting process are very compact and the tapholes which they serve are consequently of very small dimensions in general. It is therefore essential in this case to have a highly compact load casting process.
  • Another case of renovation also frequent, consists in increasing the production capacity of the casting installation, either to support the increase in capacity of a furnace, or to improve the utilization rate of an existing furnace.
  • compactness is a key characteristic in the choice of the casting process.
  • the function of the injected gas is to balance the metallostatic pressure at the meniscus formed by the metal in the angle formed by the ingot mold and the overhang of the lower riser.
  • the fundamental physical parameter of the injection is therefore the gas pressure behind the meniscus.
  • the kind of small annular chamber, the walls of which are formed by the meniscus, the ingot mold and the overhang and into which the gas is injected through the slot, is not waterproof.
  • the gas normally escapes through the meniscus-ingot mold interface (vertically downwards).
  • the difficulty of setting a flow rate to obtain the target pressure behind the meniscus is therefore real.
  • the most suitable way of carrying out the process consists in controlling the pressure, this pressure being measured at the place where the gas is injected into the ingot mold, that is to say at the level of the overhang where the metal forms a meniscus.
  • this zero pressure drop condition is only compatible with a gas injection through a slot, and again with two reservations.
  • the first is that the thickness of the slot is sufficient. Calculations and experience show that a thickness greater than 0.05 mm is necessary, or even more depending on the flow rate, so as not to have significant pressure drops when passing through the slot.
  • the second is that the flow rate must be limited to fairly low values (100 Nl / h maximum) so that the pressure drops, which we know to increase with the flow rate, remain insignificant throughout the supply circuit. gas downstream of the measuring point. This means in particular that it is absolutely necessary to avoid any parasitic leak in the case of a high metallostatic charge, where, given the high gas pressure, the leaks are immediately very large, which considerably increases the flow rate sent to the ingot mold, and therefore pressure losses.
  • this process makes possible the automated gas injection on a compact installation not equipped with a continuous supply of lubricant.
  • Slits having a selected width are used in a very narrow interval in order to take account of the pressure drop-infiltration liquid metal compromise.
  • this process is flexible to use: the gas supply can be closed on one of the ingot molds either because the flow is not used or because the cast billet was lost during casting; an overall flow rate can be applied temporarily to the installation instead of applying pressure, which is particularly useful before and during the metal filling of the ingot molds as long as there is no metal back pressure; it is also possible to temporarily apply pressures greater than the metallostatic pressure at the time of start-up when one places oneself at the limit of bubbling to facilitate the transition from a solidification regime with folds or "laps" to a solidification regime where the meniscus is stable.
  • FIG. 2 corresponding to an installation with a low density of ingot molds, there are two ingot molds 3 each surmounted by an extension 4 in connection with a distribution channel such as 5 bringing the liquid metal 6 which solidifies into billets 7 under the action cooling the ingot molds supplied with water from the manifold 8.
  • the central part of the channel 5 ′ which precisely performs this function, must retain the same section and same height of metal h as the corresponding part of channel 5. It follows that the height of the metal column located above the ingot mold, marked H 'in FIG. 3, is clearly greater than that marked H in FIG. 2.
  • FIG. 4 corresponding to a top view of FIG. 2, a distinction is made between the channel 9 which supplies the ingot molds 10 each occupying an average horizontal surface represented by the rectangle 11.
  • FIG. 6 shows the general diagram of the gas circuit for a 64-flow installation.
  • the gas source 12 the flow meter FT1, the isolation valve V1, the regulating valve PV1, the pressure gauge PT1 placed on the primary tank R1 from which the pipes supplying the ingot molds numbered 1 to 64 through the VP valves.
  • the secondary tank R2 provided with a pressure gauge PT2 and from which 64 pipelines open, each provided with a VS valve and which are connected to the pipes coming from R1 downstream of the VP valves.
  • R1 and R2 are connected to each other via a flow meter FT3 and an isolation valve V3.
  • FIG. 7 which corresponds to the pressure regulation during casting, it can be seen that the gas current, measured by the flow meter FT1 passes through the valve V1 and the regulation valve PV1, and fills R1.
  • the automatic regulation acts more or less on the opening of the PV1 valve to cancel this difference.
  • FIG. 8 corresponding to the measurement of flow rate during casting on the ingot mold No. 2, the preceding circuit is put in relation with the reservoir R2 via the flow meter FT3 and the isolation valve V3. No. 2 is isolated from R1 by closing the valve VP2 and connecting to the tank R2 via the valve VS2. An anomaly on the measured flow indicates a failure of ingot mold N ° 2.
  • FIG. 9 corresponds to the measurement, after casting, of the pressure drop created by the slot of the ingot mold No. 3 under a reference gas flow rate Dc.
  • This control is carried out by isolating R1 as well as all primary circuit, that is to say by closing V1, V3 and all the valves VP and by using only the source-R2 circuit.
  • the reference flow Dc is obtained thanks to the flow regulator consisting of the regulation valve FV2 and the flow meter FT2, and is sent to the ingot mold N ° 3 by VS3, the only valve VS to be opened.
  • the pressure measured on PT2 is directly related to the thickness of the slit. If this pressure is too strong, it is necessary to readjust this thickness, or to unclog the slit.
  • the slit is adjusted in thickness to 0.075 mm.
  • a double check is then carried out: direct check of the thickness thanks to a set of shims; indirect control by measuring the pressure drop generated by the slit at a flow rate of 200 Nl / h.
  • the installation has been prepared to pour the 254 mm diameter. Since the capacity of the oven did not allow 64 flows to be fed in this diameter, 20 flows were closed.
  • the closure of a flow consists on the one hand of closing off its metal inlet, and on the other hand of closing the gas circuit which supplies it, by means of the corresponding valve VP.
  • the ingot molds of all the flows in service were coated with a layer of grease, this lubrication being intended to cover the needs of the entire casting.
  • the first check focused on the primary circuit and revealed leaks of 17 Nl / h at 6.5 kPa of pressure in the tank R1; the second check focused on the secondary circuit and revealed leaks of 29 Nl / h at 6.5 kPa in the R2 tank.
  • the descender was started. Immediately afterwards, the flow control was replaced by a pressure control, and the setpoint was quickly brought to 6.2 kPa. After a small plateau at this value, maintained up to 150 mm of casting length, the setpoint was gradually reduced to 5.3 kPa, and maintained at this value until the end of casting.
  • a billet remained hanging from its mold at start-up and the corresponding flow therefore had to be closed, as long metal inlet side than gas supply side (closing of the VP valve for this flow).
  • the pouring took place over a length of 8.60 m.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Casting Devices For Molds (AREA)
EP93420463A 1992-11-23 1993-11-22 Verfahren zum automatischen Einblasen von Gas in den Kokillen-Aufsatz einer Multistranggiessanlage Withdrawn EP0599750A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9214277A FR2698298B1 (fr) 1992-11-23 1992-11-23 Procede d'injection automatisee de gaz dans une installation multicoulee de metaux equipee de lingotieres a rehausse.
FR9214277 1992-11-23

Publications (1)

Publication Number Publication Date
EP0599750A1 true EP0599750A1 (de) 1994-06-01

Family

ID=9435964

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93420463A Withdrawn EP0599750A1 (de) 1992-11-23 1993-11-22 Verfahren zum automatischen Einblasen von Gas in den Kokillen-Aufsatz einer Multistranggiessanlage

Country Status (7)

Country Link
US (1) US5431213A (de)
EP (1) EP0599750A1 (de)
AU (1) AU670460B2 (de)
CA (1) CA2109184C (de)
FR (1) FR2698298B1 (de)
NO (1) NO934119L (de)
NZ (1) NZ250098A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022140090A1 (en) * 2020-12-22 2022-06-30 Novelis Inc. Systems and methods of controlling gas flow in a mold in aluminum casting

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1395380B1 (de) * 2001-04-19 2006-08-16 Alcoa Inc. System zur zufuhr von metallschmelze unter konstantem druck und verfahren zur herstellung von endlosmetallartikeln
US8196641B2 (en) * 2004-11-16 2012-06-12 Rti International Metals, Inc. Continuous casting sealing method
US7934627B2 (en) * 2005-10-13 2011-05-03 Alcoa Inc. Apparatus and method for high pressure extrusion with molten aluminum
CN110340322B (zh) * 2019-08-22 2022-01-18 联峰钢铁（张家港）有限公司 一种连铸自动开浇的方法和装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2359662A1 (fr) * 1976-07-29 1978-02-24 Showa Denko Kk Procede et appareil de coulee hot-top de metaux
EP0372946A2 (de) * 1988-12-08 1990-06-13 Alcan International Limited Schmierung von Stranggiesskokillen
EP0449771A1 (de) * 1990-03-26 1991-10-02 Alusuisse-Lonza Services Ag Programmgesteuertes Einspeisen von schmelzflüssigem Metall in die Kokillen einer automatischen Stranggiessanlage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE891444C (de) * 1942-09-02 1953-09-28 Ver Leichtmetallwerke Gmbh Vorrichtung zum gleichzeitigen Giessen mehrerer Metallstraenge
US3358743A (en) * 1964-10-08 1967-12-19 Bunker Ramo Continuous casting system
JPS58352A (ja) * 1981-06-22 1983-01-05 Mitsubishi Keikinzoku Kogyo Kk 金属の竪型多連鋳造装置
JPS6333153A (ja) * 1986-07-28 1988-02-12 Sumitomo Light Metal Ind Ltd 多連装電磁鋳造における鋳込開始方法
FR2623113B1 (fr) * 1987-11-13 1990-02-09 Pechiney Aluminium Dispositif de coulee en charge a grand nombre de lingotieres de billettes metalliques de diametres multiples

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2359662A1 (fr) * 1976-07-29 1978-02-24 Showa Denko Kk Procede et appareil de coulee hot-top de metaux
US4157728A (en) * 1976-07-29 1979-06-12 Showa Denko Kabushiki Kaisha Process for direct chill casting of metals
US4157728B1 (de) * 1976-07-29 1987-06-09
EP0372946A2 (de) * 1988-12-08 1990-06-13 Alcan International Limited Schmierung von Stranggiesskokillen
EP0449771A1 (de) * 1990-03-26 1991-10-02 Alusuisse-Lonza Services Ag Programmgesteuertes Einspeisen von schmelzflüssigem Metall in die Kokillen einer automatischen Stranggiessanlage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022140090A1 (en) * 2020-12-22 2022-06-30 Novelis Inc. Systems and methods of controlling gas flow in a mold in aluminum casting

Also Published As

Publication number Publication date
AU5051893A (en) 1994-06-02
CA2109184C (fr) 2003-04-08
FR2698298B1 (fr) 1998-09-18
AU670460B2 (en) 1996-07-18
CA2109184A1 (fr) 1994-05-24
NO934119D0 (no) 1993-11-15
FR2698298A1 (fr) 1994-05-27
US5431213A (en) 1995-07-11
NO934119L (no) 1994-05-24
NZ250098A (en) 1996-06-25

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