EP0449771B2 - Programmgesteuertes Einspeisen von schmelzflüssigem Metall in die Kokillen einer automatischen Stranggiessanlage - Google Patents

Programmgesteuertes Einspeisen von schmelzflüssigem Metall in die Kokillen einer automatischen Stranggiessanlage Download PDF

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Publication number
EP0449771B2
EP0449771B2 EP91810170A EP91810170A EP0449771B2 EP 0449771 B2 EP0449771 B2 EP 0449771B2 EP 91810170 A EP91810170 A EP 91810170A EP 91810170 A EP91810170 A EP 91810170A EP 0449771 B2 EP0449771 B2 EP 0449771B2
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EP
European Patent Office
Prior art keywords
pressure
moulds
metal
value
casting
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
EP91810170A
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German (de)
English (en)
French (fr)
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EP0449771B1 (de
EP0449771A1 (de
Inventor
Jean-Jaques Thèler
Edmond Rey
Jean-François Jordan
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.)
3A Composites International AG
Original Assignee
Alusuisse Lonza Services Ltd
Alusuisse Technology and Management Ltd
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Application filed by Alusuisse Lonza Services Ltd, Alusuisse Technology and Management Ltd filed Critical Alusuisse Lonza Services Ltd
Publication of EP0449771A1 publication Critical patent/EP0449771A1/de
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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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0401—Moulds provided with a feed head
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level

Definitions

  • the invention relates to a method and a device for feeding molten liquid Metal in the inside insulated in the upper area Chill molds in an automatic continuous caster with an upstream casting furnace and a Gutter system, which all molds dining at the same level with metal Distribution trough includes, in the below one Inner ring area a direct contact the mold with the metal-preventing gas cushion maintain and in its area oil is injected.
  • the invention further relates to a Application of the procedure.
  • the continuous casting process uses metals in In the form of bars or bolts several meters long cast, which as a material for various subsequent processing steps used such as for pressing, rolling or Forge.
  • a casting machine is, ever according to the number of strands cast, with correspondingly many, lowerable approach floors equipped, which is firmly connected to a casting table are.
  • Hot top procedures have been developed at which the metal in an all molds on the same Level feeding distribution trough (hot top) flows.
  • the level control devices of all individual molds can be omitted and by a central Control body to be replaced, which is a quieter Metal surface and a simplified casting process allowed.
  • the usual hot top casting process is through the formation of a gas cushion with automatic Lubrication for a semi-continuous casting process has been further developed, in which a direct contact between the liquid metal and the mold thanks to the air cushion and an oil film is prevented in the top area.
  • US Pat. No. 4,157,728 describes a hot top continuous casting process of the type mentioned above, wherein a circular air cushion underneath of the yard top is formed. This is a slight overpressure necessary. The setting of the Overpressure is done manually, using a screw.
  • Air and oil are supplied in the same Area but separate.
  • the object of the present invention is to achieve this based on a method and an apparatus of the to create the kind mentioned above, which a further automation of the hot top casting process allow.
  • the task solved according to the invention in that a common Main line with distribution lines Air or an inert gas with the same low Overpressure leads to all molds, and the relative pressure between one in function of over one Level probe measured metal height program calculated Target value and one in the main line actual value measured with a transmitter the program-controlled control and Monitoring serves by using the control function of a processor by emitting a signal for the actuator of a common pressure control valve is fulfilled.
  • the inert gases are, for example, nitrogen and or argon is used.
  • air is usually used, which is why in the following, for the sake of simplicity, the designation Air also includes inert gases.
  • the height of the metal surface can be adjusted with a Level probe measured in a known design but also with a laser sensor.
  • the in actual pressure measured in the main line shows of the large diameter with small pressure drops no fluctuations.
  • the invention is therefore the influence of the variable Outside pressure automatically with known means balanced by using a commercially available differential pressure gauge is used.
  • the oil necessary for lubrication is preferred in pulses in the area of the gas cushion sprayed. This allows the oil to work with higher pressure be injected without reducing overall consumption gets too high.
  • the outlet channels for the gas and oil can be separated or combined into one channel be.
  • the pressure in the gas cushion may be a certain one Do not exceed the maximum value, otherwise they will form gas bubbles in the metallic melt. Of the However, pressure of the gas cushion may also be a certain one do not fall below the minimum value, otherwise the molten metal can enter the gas supply channels penetration.
  • the minimum and the maximum Value for the pressure in the gas cushion linear to the respective metallostatic pressure in the mold. The minimum pressure, which was not below may correspond to a function the density ⁇ , the acceleration due to gravity g, the metal level above the gas outlet openings, the Interfacial tension of the melt in the area Isolation mold and the surface tension of the Melt in the area of the gas cushion.
  • the maximum Pressure in the gas cushion which did not exceed is a function of the density of the Melt ⁇ , gravitational acceleration g and the Depth of undercut of insulation.
  • the object is achieved according to the invention in that it has a main line for the gas supply with a servo pressure valve and a transmitter on the system side and a computer comparing the actual pressure control variables of the transmitter and the control variable of the setpoint value, a manipulated variable for the actuator of the Processor triggering pressure control valve, and that the target pressure is calculated via a program as a function of the metal height (H 1 ) measured via a level probe.
  • the setpoint is calculated based on the for example measured with a laser sensor Metal level determined.
  • the main line for the gas supply has expedient an inner diameter of 5 - 10 cm.
  • the branching distribution lines are preferred directly, without secondary lines, to the molds.
  • the main line is preferably oversized, i.e. the sum of the cross section of all Distribution lines are significantly below that Cross section of the main line, preferably at least 20%. It has already been mentioned that the Distribution lines do not have to be the same length. With the cross section is always here and otherwise the inner cross-section is meant.
  • the margin remains the bottom of the Mold-insulating layer preferably undercut.
  • This Undercut has turned out to be about 10 mm, which better enables a stable gas cushion to build.
  • the undercut can take any geometrical shape this preferably as a tapered bevel.
  • a removable laser sensor used as a level measuring device for determining the everywhere in the gutter system and in the molds same metal level.
  • the application of the method according to the invention lies primarily in automation the start-up and pouring end as well as quality control during the stationary phase of Continuous casting.
  • the schematic diagram shown in Fig. 1 of the known hot top continuous casting includes in essentially a gutter system 10, made of refractory Material existing hot tops 12, too Called hot heads, molds 14, cast strands 16 and a casting table 18.
  • the gutter system 10 in which the Metal with the same level in all channels towards of arrow 20 flows includes a distribution trough 22. This serves as a reservoir for liquid Metal.
  • the individual gutters go in Grooves 24 of the hot top 12 over.
  • the grooves 24 also in the transverse direction and go above the molds 14 in holes through the hot top 12 over. This ensures that the metal level only must be measured at one point. This Level is inside the whole caster equal to the measurement tolerances.
  • Casting table 18 are one of the number of molds 14 corresponding number of approach floors 28 arranged.
  • FIG. 2 shows a hot top 12, a mold 14 and a cast metal strand 16 in detail.
  • the hot top 12 conducts, as shown in FIG. 1, the molten metal 30 via grooves 24 in the Chill molds 14.
  • the Hot Top 12 is made of fireproof Insulating material.
  • the three-ring mold 14 has a ring-shaped inner insulation in the upper inner area 32, which is the contact of the molten Metal 30 with the upper region of the mold 14 prevented.
  • the insulation 32 has one in the lower region undercut bevel 34.
  • the one bevel fireproof material existing insulation ring 32 is placed on the mold 14 by means of a pressure plate 36 pressed.
  • An O-ring, not shown, is guaranteed the tightness between the mold 14 and the Isolation ring 32.
  • the inner surface of a lower mold ring 38 determines the diameter of the strand 16. From ring-shaped water reservoir 40 is via channels 42 water 44 onto strand 16 sprayed.
  • a middle mold ring 46 contains one through the lower mold ring 38 bounded annular Oil chamber with outlet channels 50, which immediately below the inclined surface 34 of the insulation ring 32 open out.
  • the oil chamber 48 will fed via radial channels, not shown, which from the lower ring 38 or from the middle Ring 46 recessed and by the other Ring are limited.
  • An upper mold ring 52 includes an annular one Air chamber 53 with radial, not shown Branch channels between the middle and the upper mold ring.
  • the air gets a little overpressure, in the range of about 45 mbar, immediately below the bevel 34 of the insulation 32 in the Mold interior directed. This creates a ring-shaped one Air cushion 54. This alleviates the cold shock the one hitting the mold 14 molten metal 30.
  • Air and oil occur in the same area, in the ring-shaped Air or gas cushion 54, from, in the present Case separately.
  • the vertical distance between the common level 60 of the molten metal 30 in the channel system 10, the grooves 24 and the mold 14 and the transition from the bevel 34 of the insulation ring 32 to the mold 14, in the region of the air outlet channels, is referred to as the metal level H 1 .
  • the metal level H 1 is in the range of 200 mm.
  • the insulation 32 has a chamfer depth H 2 of approximately 10 mm.
  • the sum of H 1 + H 2 is denoted by H.
  • the pressure in the air cushion 54 must not fall below the metallostatic pressure in the depth H 1 , increased by the interfacial and surface tension, and must not exceed the depth H for the reasons mentioned above.
  • the metallostatic pressure is plotted as a function of the metal level H 1 .
  • curve B shows the values for the onset of blistering.
  • Fig. 3 can be used in practice for a given metal level the one to be used read optimal pressure. This lies, as already mentioned, at or just below 50 mbar.
  • FIG. 4 shows a main line 62 of the compressed air supply, which passed through a pressure control valve 64 becomes. After branching off to a transmitter 66 for the actual pressure branches from the Main line 62 leading to the mold distribution lines 68 from.
  • the number of distribution lines 68 corresponds to the number of molds in the Casting machine, for example up to 36.
  • the transducer 66 becomes a controlled variable passed to a processor 70.
  • the actuator 74 can be a stepper motor, for example or be a DC motor.
  • a target value dependent on the metal level H 1 (FIG. 2) is continuously calculated, which is compared with the actual value of the air supply.
  • the pressure in the air cushion is automatically adapted to a changed metal level by changing the pressure in the main line 62.
  • the air flow V shown in FIG. 5 per unit of time and mold is plotted as a function of the casting time t.
  • the air flow rate V A is relatively high. With the onset of the supply of liquid metal and increasing metal level, the air flow drops relatively steeply.
  • a signal for lowering the casting table is triggered with a delay of about 5 seconds.
  • a cold run K occurs shortly after the minimum target value V s of about 2 to 3 mbar has been reached. Due to poor strand quality, air can escape between the mold and your strand. After a short time, the quality is normal, the air flow drops again to the minimum setpoint V s .
  • the metal level in the mold drops, and the air flow V rises correspondingly steeply.
  • V 2 a signal for the end of casting is triggered.
  • a dashed line 76 is the regulator pressure, in the present case in stationary normal operation 45 mbar, specified.
  • the dotted line 78 shows the pressure curve after 3 m length in one Main pipe with 6 mm inside diameter.
  • Fig. 6 shows that the air flow Q of the The sum of all air losses corresponds.
  • the air flow is determined via a flow meter 80.
  • the losses Q 1 to Q 4 are due to the condition of the system; they must be negligibly small in the case of functional systems.
  • the air losses Q 5 and in particular Q 7 allow conclusions to be drawn about the quality of the cast strand.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Control By Computers (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Control Of Non-Electrical Variables (AREA)
EP91810170A 1990-03-26 1991-03-15 Programmgesteuertes Einspeisen von schmelzflüssigem Metall in die Kokillen einer automatischen Stranggiessanlage Expired - Lifetime EP0449771B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH98990 1990-03-26
CH989/90 1990-03-26

Publications (3)

Publication Number Publication Date
EP0449771A1 EP0449771A1 (de) 1991-10-02
EP0449771B1 EP0449771B1 (de) 1995-01-25
EP0449771B2 true EP0449771B2 (de) 1998-08-12

Family

ID=4199879

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91810170A Expired - Lifetime EP0449771B2 (de) 1990-03-26 1991-03-15 Programmgesteuertes Einspeisen von schmelzflüssigem Metall in die Kokillen einer automatischen Stranggiessanlage

Country Status (11)

Country Link
US (1) US5170838A (xx)
EP (1) EP0449771B2 (xx)
JP (1) JPH04224048A (xx)
AT (1) ATE117605T1 (xx)
AU (1) AU634638B2 (xx)
CA (1) CA2038233A1 (xx)
DE (1) DE59104354D1 (xx)
ES (1) ES2067903T3 (xx)
GR (1) GR3015862T3 (xx)
NO (1) NO178058C (xx)
ZA (1) ZA912173B (xx)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4203337C2 (de) * 1992-02-06 1994-07-07 Vaw Ver Aluminium Werke Ag Verfahren zum Stranggießen von Metallen
DE4212531C1 (de) * 1992-04-15 1993-10-21 Vaw Ver Aluminium Werke Ag Gas- und Trennmittelzuführungs- und Verteilungssystem für eine Vorrichtung zum Stranggießen
FR2698298B1 (fr) * 1992-11-23 1998-09-18 Pechiney Aluminium Procede d'injection automatisee de gaz dans une installation multicoulee de metaux equipee de lingotieres a rehausse.
NO300411B1 (no) * 1995-05-12 1997-05-26 Norsk Hydro As Stöpeutstyr
US5873405A (en) * 1997-06-05 1999-02-23 Alcan International Limited Process and apparatus for direct chill casting
AUPR309901A0 (en) * 2001-02-15 2001-03-08 Konbridge Proprietary Limited Method and apparatus for moulding
DE102009037368A1 (de) * 2009-08-12 2011-02-17 Strikowestofen Gmbh Verfahren und Vorrichtung zum Dosieren von geschmolzenem Metall

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE555574A (xx) *
DE2525483B2 (de) * 1975-06-07 1978-11-23 Vereinigte Aluminium-Werke Ag, 5300 Bonn Verfahren zum Schmieren von Heißkopfstranggießkokillen
US4597432A (en) * 1981-04-29 1986-07-01 Wagstaff Engineering, Inc. Molding device
AU539444B2 (en) * 1981-06-25 1984-09-27 Kepac Limited Hinge
FR2508829A1 (fr) * 1981-07-06 1983-01-07 Fives Cail Babcock Procede de refroidissement et de lubrification de la paroi d'une lingotiere de coulee continue
JPS6137352A (ja) * 1984-07-31 1986-02-22 Showa Alum Ind Kk 金属の連続鋳造法
DE3533517A1 (de) * 1985-09-20 1987-04-02 Vaw Ver Aluminium Werke Ag Verfahren und vorrichtung zum stranggiessen
JPS63273553A (ja) * 1987-04-30 1988-11-10 Furukawa Alum Co Ltd 中空ビレツトの製造方法および装置
JPH07100213B2 (ja) * 1987-06-18 1995-11-01 石川島播磨重工業株式会社 双ロ−ル式連鋳機

Also Published As

Publication number Publication date
GR3015862T3 (en) 1995-07-31
NO178058B (no) 1995-10-09
EP0449771B1 (de) 1995-01-25
ZA912173B (en) 1991-12-24
AU634638B2 (en) 1993-02-25
ATE117605T1 (de) 1995-02-15
NO911214L (no) 1991-09-27
US5170838A (en) 1992-12-15
NO178058C (no) 1996-01-17
NO911214D0 (no) 1991-03-25
EP0449771A1 (de) 1991-10-02
AU7297391A (en) 1991-10-03
CA2038233A1 (en) 1991-09-27
DE59104354D1 (de) 1995-03-09
JPH04224048A (ja) 1992-08-13
ES2067903T3 (es) 1995-04-01

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