EP0403035A2 - Procédé pour porter à une température un bain métallique - Google Patents

Procédé pour porter à une température un bain métallique Download PDF

Info

Publication number
EP0403035A2
EP0403035A2 EP90250080A EP90250080A EP0403035A2 EP 0403035 A2 EP0403035 A2 EP 0403035A2 EP 90250080 A EP90250080 A EP 90250080A EP 90250080 A EP90250080 A EP 90250080A EP 0403035 A2 EP0403035 A2 EP 0403035A2
Authority
EP
European Patent Office
Prior art keywords
melt
temperature
target temperature
heating power
plasma torch
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.)
Granted
Application number
EP90250080A
Other languages
German (de)
English (en)
Other versions
EP0403035B1 (fr
EP0403035A3 (fr
Inventor
Hans Josef Dr. Rer. Nat. Bebber
Karsten Dipl.-Ing. Brabandt
Bernhard Dipl.-Ing. Espendiller
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.)
Vodafone GmbH
Original Assignee
Mannesmann 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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0403035A2 publication Critical patent/EP0403035A2/fr
Publication of EP0403035A3 publication Critical patent/EP0403035A3/fr
Application granted granted Critical
Publication of EP0403035B1 publication Critical patent/EP0403035B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/04—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like tiltable
    • B22D41/05—Tea-pot spout ladles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
    • B22D2/006—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass for the temperature of the molten metal
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal

Definitions

  • the invention relates to a method for achieving a temperature of a molten metal in a pan or at the outlet of a distribution channel, the heating energy required for this being generated by at least one plasma torch.
  • EP-A1-0 180 741 discloses a method and a device for maintaining or increasing the temperature of a molten metal in a receptacle by supplying energy, the energy required for this being introduced by one or more plasma torches.
  • this document does not contain any information about how the heating power required for a predeterminable temperature should be measured.
  • no temporal boundary conditions for the temperature to be achieved are addressed there.
  • the invention has for its object to provide a method which ensures that the temperature of a molten metal in a ladle or a tundish at a predetermined point, e.g. at the outlet of the vessel, even in the event of any interfering influences, corresponds to a predefinable temperature profile over time, the temperature profile in the simplest case also being constant (maintaining the temperature).
  • the heating power determined by the control which in principle can also have a profile depending on the time, can approximately achieve the desired profile of the target temperature in the event of non-occurring disturbances
  • the feedback of the measured temperature is used to a controller Adaptation of the heating power determined on the basis of the entered values to the heating power actually required to achieve the target temperature in the event of interferences, so that the temperature profile of the molten metal, for example at the exit of the pan, the target is leveled out to a predefinable tolerance.
  • the distance between the plasma torch and the melt corresponding to the arc length is set to a low initial value and the current strength is changed in accordance with the required heating power, the heating power required in each case being compared with a heating power characteristic value, which is possible at maximum current and the initial distance between the plasma torch and the melt and the power adjustment required for temperature control, as long as the required heating output is below the heating output characteristic value, only via the current (with the arc length equal to the initial distance) and, insofar as the required heating output is above the heating power value lies exclusively over the distance between the plasma torch and the melt (with the arc current equal to the maximum current).
  • the steel mill or ladle 1 shown in FIG. 1 is filled with a molten metal 2.
  • a plasma torch 4 is carried out through the cover 3 of the ladle 1, the distance a from the surface of the melt 2 corresponding to the arc length can be changed by a moving device 5.
  • plasma torches can also be used, which can be supplied with direct or alternating current (or three-phase current) from a current source 6.
  • a temperature measuring point T1 is provided at the outlet 9 of the ladle 1.
  • a control and regulating device 7 is provided between the temperature measuring point T1 and the displacement device 5 and the current source 6, which receives the measurement signal of the temperature of the measuring point T1 on the input side and is connected to the displacement device 5 and the current source 6 with one output each.
  • the control and regulating device 7 consists of an adaptive controller 21 and a regulator 22, which are linked to form a unit 23, and a power adjustment 24, the adaptive controller 21 automatically adapting (adapting) its control program according to the requirements caused by different initial conditions.
  • the power adjustment 24 influences the current source 6 and the displacement device 5 within the controlled system 25 with the plasma torch 4 and the metal melt 2. A feedback is available from the measuring point T1 to the controller 22.
  • a target temperature T1 '(t) of the melt 2 which is to be observed, for example, when pouring onto the ladle 1, are first - The desired time course of the target temperature T1 '(t) and - as initial and boundary conditions in particular . the initial temperature T1 of the melt 2, . the mass m2 of the melt 2, . the specific heat capacity of the melt 2, . the mass flow ⁇ 9 of the outflowing melt, . System parameters such as the thickness of the lining of the ladle 1 etc. entered into the adaptive controller 21 and the controller 22.
  • the controller 21 determines the control signals for the heating power Q ⁇ (t) required to achieve the temperature profile T1 ′ (t) to be achieved, without taking into account any interference that may occur.
  • the controlled system 25 is modeled in its various process states on the one hand and on the other hand a reference temperature profile of the melt in the pan 1 in the operating point state is defined.
  • the controller 22 Simultaneously with the input of the above-mentioned data and continuously, the actual temperature T1 of the melt 2 is measured at the outlet of the ladle 1, the controller 22 in the event of a difference between the actual temperature T1 and the target temperature T1 ′ (t) that deviates from zero or a predetermined tolerance.
  • the control signal for heating power Q ⁇ (t) predetermined by the controller 21 changes such that the difference (T1 - T1 '(t)) developed back into the predeterminable tolerance.
  • the power adjustment 24 queries whether the respective heating power Q ⁇ (t) is less than or equal to the heating power K, which with the maximum current I max and a minimum distance a0 of the plasma torch 4 predetermined at the beginning, from the surface of the melt 2 is achievable.
  • the heating power Q ⁇ (t) specified by the controller 21 is in each case less than or equal to the heating power K (also referred to as the heating power characteristic value), the current intensity I is increased accordingly and if the predetermined heating power Q ⁇ (t) is greater than the heating power K is, the maximum current I max is left and the distance a of the plasma torch 4 from the surface of the melt 2 is increased in accordance with the predetermined heating power Q ⁇ (t) while increasing the arc voltage.
  • the pouring or distribution channel 10 shown in FIG. 3 has an inlet 11 at one end and one or more outlets 19 to one or each of a continuous casting installation (not shown here) at the other end (such an installation is described, for example, in US Pat. PS 3,333,452).
  • One or more plasma torches 14 are passed through the cover 13 of the distributor trough 10, the distance a from the surface of the melt 12 corresponding to the arc length being variable by a displacement device 15.
  • the plasma torch or torches 14 are connected to a current source 16.
  • a temperature measuring point T3 is provided at the at least one outlet of the distributor trough 10.
  • control and regulating device 17 which receives the measuring signal of the temperature of the measuring point T3 on the input side and is connected to the moving device 15 and the current source 16 with separate outputs.
  • the control and regulating device 17 for the distribution channel 10 consists of an adaptive control 31 and a control 32, which are linked to form a unit 33, and a power adjustment 34, the adaptive control 31 automatically adjusting its control program again according to the different Adapts initial conditions caused requirements (adapted).
  • the power adjustment 34 influences the current source 16 and the displacement device 15 within the controlled system 35 with the plasma torch 14 and the metal melt 12.
  • the heating power thus coupled directly influences the temperature T5 of the melt 12 below the at least one plasma torch 14.
  • this temperature T5 is due to a Dead time element t s is separated from the temperature T3 relevant for the process and thus for the control, which is compared with the target temperature profile T3 '(t) by a subtraction, the result of which is received in the controller 32.
  • the dead time t s is essentially due to the flow of the melt 12 in the channel 10 and the distance in the flow direction between the heat coupling through the at least one plasma torch 14 and the measuring point T3.
  • a target temperature T3 '(t) of the melt 12 are at the beginning of the casting process or at the beginning of a process change -
  • the time course of the target temperature T3 '(t) and - as initial and boundary conditions in particular.
  • the specific heat capacity of the melt 12 .
  • System parameters such as the thickness of the lining of the distribution channel 10 etc. entered into the adaptive controller 31 and the controller 32.
  • the controller 31 determines the control signals for the heating power Q ⁇ (t) required to achieve the temperature curve T3 ′ (t) to be achieved, without taking into account any interference that may occur.
  • the controller 31 also reacts automatically to changes in the process sequence (e.g. extension of a ladle change, delay in pouring, etc.), provided that these are entered by the staff using additional signals.
  • the controlled system 35 is in turn modeled in its various process states and, on the other hand, a reference temperature profile of the melt 12 in the distributor channel 10 is determined in the operating point state.
  • the control 32 in the event of a difference between the actual temperature T3 and the target temperature T3 ′ (t) which deviates from zero or a predetermined torelance the control signal given by the control 31 for heating power Q vorplace (t) changes taking into account the dead time t s in such a way that the difference (T3 - T3 '(t)) develops back into the predeterminable tolerance.
  • the power adjustment 34 it is queried whether the respective heating power Q ⁇ (t) is less than or equal to the heating power K (also referred to as the heating power characteristic value), the maximum current I max and a predetermined minimum distance a vortexen of the plasma torch 14 from the surface of the melt 12 can be reached.
  • the heating power Q ⁇ (t) specified by the controller 31 is less than or equal to the heating power K, the current intensity I is increased accordingly and, if the predetermined heating power Q ⁇ (t) is greater than the heating power K, the maximum current strength I max leave and the distance a of the plasma torch 14 from the surface of the melt 12 is increased according to the predetermined heating power Q ⁇ (t) while increasing the arc voltage.
  • a double temperature feedback is provided in a further embodiment (FIG. 5).
  • a further temperature measuring point T5 which is set up in the distributor channel 10 below the plasma torch 14 (cf. dash-dotted connecting line in FIG. 3).
  • the measuring signal of the temperature measuring point T5 is received after a subtracting temperature comparison in the controller 32 '.
  • the temperature of the melt 12 at the measuring point T3 now has essentially the same desired characteristic as the melt of the measuring point T5, since they are now separated from one another by the dead time element t s .
  • the difference between the target temperature T3' (t) and the temperature of the measuring point T3 is taken into account in a controller application control 37, taking into account the dead time t s , which influences the control process of the controller 32 'according to the still existing temperature difference (T3' - T3) and thus adjusts T3 to the target curve T3 '(t).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Details (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP90250080A 1989-05-12 1990-03-22 Procédé pour porter à une température un bain métallique Expired - Lifetime EP0403035B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3915619A DE3915619A1 (de) 1989-05-12 1989-05-12 Verfahren zum erzielen einer temperatur einer metallschmelze
DE3915619 1989-05-12

Publications (3)

Publication Number Publication Date
EP0403035A2 true EP0403035A2 (fr) 1990-12-19
EP0403035A3 EP0403035A3 (fr) 1991-03-27
EP0403035B1 EP0403035B1 (fr) 1994-01-19

Family

ID=6380570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90250080A Expired - Lifetime EP0403035B1 (fr) 1989-05-12 1990-03-22 Procédé pour porter à une température un bain métallique

Country Status (6)

Country Link
US (1) US5081640A (fr)
EP (1) EP0403035B1 (fr)
JP (1) JP2925655B2 (fr)
KR (1) KR900017697A (fr)
DE (2) DE3915619A1 (fr)
ZA (1) ZA903344B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5793022A (en) * 1996-09-12 1998-08-11 Applied Materials, Inc. Adaptive temperture controller and method of operation
GB2352992B (en) * 1999-08-05 2002-01-09 Pyrotek Engineering Materials Distributor device
DE102014213744A1 (de) * 2014-07-15 2016-01-21 Primetals Technologies Germany Gmbh Elektrischer Lichtbogenofen mit einer Sicherheitsvorrichtung und Verfahren zur Sicherung von Peripheriegeräten an elektrischen Lichtbogenöfen
CN114178504B (zh) * 2021-12-13 2022-09-02 北京航星机器制造有限公司 一种低压铸造铝合金熔体的智能控温方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333452A (en) * 1965-03-03 1967-08-01 Sendzimir Inc T Reduction of thick flat articles
DE1288760B (de) * 1966-06-14 1969-02-06 Coupette Verfahren zur Steuerung von Temperatur und Stahlanalyse beim Stranggiessen und Vorrichtung dazu
SU762216A1 (ru) * 1978-10-11 1980-09-07 Boris P Polkov Регулятор мощности многофазной руднотермической электропечи
US4323763A (en) * 1979-05-14 1982-04-06 Gca Corporation Parametric power controller
US4486211A (en) * 1980-06-27 1984-12-04 Energy Fibers Int'l Corp. Apparatus and methods of operation for converting fly ash into high quality mineral wool
US4484947A (en) * 1983-04-22 1984-11-27 North American Manufacturing Company Method for melting a charge of bulk solid metal
DE3443740A1 (de) * 1984-10-11 1986-04-17 Fried. Krupp Gmbh, 4300 Essen Verfahren und vorrichtung zum halten oder erhoehen der temperatur einer metallschmelze
SU1453631A1 (ru) * 1987-01-07 1989-01-23 Специальное проектно-конструкторское и технологическое бюро электротермического оборудования Производственного объединения "Сибэлектротерм" Способ автоматического регулировани электрического режима дуговой сталеплавильной печи
DE3810292A1 (de) * 1988-03-25 1989-10-05 Rexroth Mannesmann Gmbh Einrichtung zur regelung eines lichtbogenofens durch hydraulische hoehenverstellung der elektrode

Also Published As

Publication number Publication date
EP0403035B1 (fr) 1994-01-19
DE59004280D1 (de) 1994-03-03
EP0403035A3 (fr) 1991-03-27
ZA903344B (en) 1991-02-27
KR900017697A (ko) 1990-12-19
DE3915619A1 (de) 1990-11-15
US5081640A (en) 1992-01-14
JP2925655B2 (ja) 1999-07-28
JPH03468A (ja) 1991-01-07

Similar Documents

Publication Publication Date Title
EP0897786A2 (fr) Procédé de régulation d'une machine de moulage par injection de matières plastiques
EP0026390B1 (fr) Procédé de mise au point de la vitesse d'ajustement des côtés étroits d'une plaque lingotière lors de la coulée continue d'acier
DE2923115A1 (de) Anordnung beim kontinuierlichen giessen, wie z.b. beim stranggiessen
DE2851256C2 (fr)
EP0515010A2 (fr) Mesure de la température à une lingotière pour brammes
DE2440273C2 (de) Verfahren zur regelung des stranggiessprozesses beim vergiessen von stahl, sowie anordnung zur durchfuehrung des verfahrens
EP0019114B1 (fr) Procédé et dispositif pour la coulée continue de plusieurs barres
EP1183118B1 (fr) Automatisation d'une installation de coulee continue grande vitesse
EP0403035B1 (fr) Procédé pour porter à une température un bain métallique
EP3554744A1 (fr) Procédé et dispositif de régulation d'une installation de coulée continue
EP3173166B1 (fr) Procédé et dispositif de réglage de la largeur d'une barre métallique coulée en continu
EP3733323A1 (fr) Procédé et installation de coulée en continu d'une barre de coulée
WO2010066447A1 (fr) Dispositif de détection du débit, et procédé correspondant
WO1999059750A1 (fr) Dispositif et procede de coulee de metal, proche des cotes finales
AT518450B1 (de) Verfahren und Kühleinrichtung zum Kühlen eines metallischen Strangs
EP0560024A2 (fr) Procédé de coulée continue de métal
CH646352A5 (en) Apparatus for regulating the secondary cooling in a continuous-casting installation with batchwise smelt supply via a tundish
EP0083916B1 (fr) Dispositif pour la coulée continue horizontale de métaux et d'alliages, notamment d'acier
DE3001275C2 (de) Anordnung zum Steuern der Kühlwasserzufuhr zu Gußsträngen in einer Stranggießanlage
DE102005024843B4 (de) Verfahren zum Regeln der Schmalseitenkonizität einer Plattenkokille
DE862486C (de) Anlage zum kontinuierlichen Giessen von Straengen aus hochschmelzenden Metallen
AT375852B (de) Vorrichtung zur automatischen regelung der sekundaeren abkuehlung eines metallstranges in anlagen zum kontinuierlichen stranggiessen
DE1806765C3 (de) Anordnung zur Bildung von Aus gangsimpulsen mit einstellbarer Frequenz
DE3009697C2 (fr)
DE2709052A1 (de) Verfahren und vorrichtung zum eingiessen vorbestimmter schmelzenmengen in aufeinanderfolgende kokillen

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): BE DE FR GB IT SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): BE DE FR GB IT SE

17P Request for examination filed

Effective date: 19910319

17Q First examination report despatched

Effective date: 19920507

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE FR GB IT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19940119

Ref country code: SE

Effective date: 19940119

ITF It: translation for a ep patent filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19940217

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19940223

Year of fee payment: 5

REF Corresponds to:

Ref document number: 59004280

Country of ref document: DE

Date of ref document: 19940303

ET Fr: translation filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19940425

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050322

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20090325

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20090320

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20090312

Year of fee payment: 20

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Expiry date: 20100321

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20100321

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20100322