EP0049238A2 - Procédé de commande pour l'extraction de barres - Google Patents

Procédé de commande pour l'extraction de barres Download PDF

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Publication number
EP0049238A2
EP0049238A2 EP81890155A EP81890155A EP0049238A2 EP 0049238 A2 EP0049238 A2 EP 0049238A2 EP 81890155 A EP81890155 A EP 81890155A EP 81890155 A EP81890155 A EP 81890155A EP 0049238 A2 EP0049238 A2 EP 0049238A2
Authority
EP
European Patent Office
Prior art keywords
strand
mold
skin
contraction
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.)
Granted
Application number
EP81890155A
Other languages
German (de)
English (en)
Other versions
EP0049238B1 (fr
EP0049238A3 (en
Inventor
Max Ahrens
Manfred Dipl.-Ing Haissig
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.)
Boehler AG
Original Assignee
Boehler 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 Boehler AG filed Critical Boehler AG
Priority to AT81890155T priority Critical patent/ATE9656T1/de
Publication of EP0049238A2 publication Critical patent/EP0049238A2/fr
Publication of EP0049238A3 publication Critical patent/EP0049238A3/de
Application granted granted Critical
Publication of EP0049238B1 publication Critical patent/EP0049238B1/fr
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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock

Definitions

  • the invention relates to a method for controlling the strand withdrawal from a horizontal continuous casting mold cooled with a cooling medium with a material of higher thermal conductivity, the strand being withdrawn step by step from the mold and the metal melt, e.g. Steel melt, discontinuously enters the mold and, after forming a strand skin, the strand is pulled off again by one step and then pushed back by a partial step.
  • the metal melt e.g. Steel melt
  • the strand that is formed is gradually withdrawn from metals that have a higher melting point from a stationary or movable horizontal mold. There is either a downtime between the individual steps or the strand is pushed back by a partial step. This procedure is followed in order to bring about a welding of the strand skin which forms directly from the melt with the strand skin which has already been formed and has already been removed by one step. If no complete welding has taken place, there is a risk that the strand skin remains at the beginning of the mold and that there is liquid melt between it and the strand skin that has been pulled off with the strand, which has already been partially solidified, which can escape from the mold when the strand is withdrawn further.
  • a control of the strand withdrawal can be carried out as a function of the strand skin formation, but the delays between non-welding of the strand skin sections and the measurement of the temperature drop are so great that a breakthrough of the melt from the mold cannot be prevented with certainty.
  • a disadvantage of this method is that the temperature is measured on the wall of the mold, but this is dependent on the amount of heat reaching the measuring point. The amount of heat does not get through Heat radiation, but through heat conduction, which takes a considerable amount of time, to the measuring point.
  • the invention has for its object to provide a method for controlling the strand withdrawal, in which the above. Disadvantages are avoided and it is easy to carry out.
  • the process according to the invention essentially consists in that the strand withdrawal is controlled as a function of the expansion or contraction of the mold wall in contact with the strand skin.
  • the stretching or contraction is caused by forces. In contrast to heat, these forces propagate immediately into an area where they can be measured, etc. at a point in time at which no temperature change has yet occurred at the measuring location.
  • the strand withdrawal is controlled as a function of the expansion or contraction of the mold wall which alternately contacts the molten metal or the skin of the strand.
  • the measurement of the expansion or contraction can be carried out particularly advantageously in the space through which the cooling medium flows, since the measurement there can be carried out particularly simply at an approximately constant temperature.
  • FIG. 1 shows a schematic illustration of a horizontal continuous casting installation in section
  • FIG. 2 shows two diagrams
  • FIG. 3 shows a block diagram.
  • 1 means the melt container, which has a channel 2. Between this and the mold 3, a two-part nozzle block 4 and 5 is arranged, through which the melt reaches the mold from the melt container.
  • the nozzle block 5 extends with its cylindrical extension into the channel 2, whereas the nozzle block 4 has a conical lumen which opens into the mold cavity.
  • the mold is detachably connected to the melt vessel by screws (not shown). It has a jacket 6 through which the cooling water flows, the inlet and outlet taking place through the pipe sockets 7 and 8.
  • a take-off roller 9 is provided, which is driven by a motor, not shown. The strand 10 is pressed against the take-off roller 9 by the pivotably mounted roller 11 and the compression spring 12.
  • the strand has an outer, already solidified strand skin, within which liquid melt is still present.
  • the strand skin is formed immediately after the nozzle block 4, the liquid melt reaching the mold wall in each case in a withdrawal step, thus heating and expanding it.
  • a strand skin ring is formed, which has a taper.
  • a strain gauge 13 is arranged in the jacket 6 through which the cooling water flows, on the wall forming the strand skin. This strain gauge is arranged in the transverse direction of the strand. This arrangement is particularly advantageous for small strands to be formed and small step lengths.
  • the strain gauge is soldered or welded to the surface of the wall and coated with an epoxy resin. It has an external power line (not shown).
  • the strand is pushed back by a partial step, which is approximately 10% of the forward-facing step, which on the one hand compensates for the lengthwise shrinkage of the strand, which is caused by the cooling thereof, and furthermore a collision of the strand skin is reached. If there is no welding of the strand skin sections, a strand skin section remains in the area of the first solidification, whereas the further strand skin sections are pulled off with the strand, as a result of which the liquid melt also reaches the mold wall outside of the area in which the strand skin is usually formed.
  • FIGS. 2a and 2b The typical time and voltage profiles are given in FIGS. 2a and 2b.
  • the diagram of FIG. 2a relates to a measurement result which is obtained when the strain gauge or the pressure-sensitive quartz crystal is arranged in an area in which no melt comes to the inner wall in the case of trouble-free continuous casting. Such a trouble-free course is given in the area x 1 .
  • the step lasts in each case one second, with a slight change in the elongation taking place in accordance with the tapering in the respective strand skin sections, as is represented in the area x 1 by the respective maxima.
  • the area Xz is significant for a beginning strand break, in which the liquid melt reaches the inside wall of the mold and thus causes a greater expansion of the same.
  • the entire strand is pushed back until the strand skin section which has remained in the mold has been welded to the rest of the strand skin, which can usually be achieved with less than one step back. This pushing back is shown in section x3. After the strand skin sections have been welded together, the usual strand withdrawal takes place again.
  • the stress states on the outer mold wall are shown by specifying the change in length in the area of the strand skin formation.
  • the section x l relates to a trouble-free strand withdrawal, with the melt reaching the mold wall when the newly formed strand skin section is withdrawn, which causes a tension on the outer wall, which is steadily reduced by the simultaneous cooling.
  • the strand is then moved back by approximately i 0 of the step, so that the change in voltage through the arbitrarily determined zero point reaches the negative range.
  • the strand is drawn off again immediately, whereupon liquid melt reaches the mold inner wall again.
  • the strain or tension measuring strip can be arranged in any region, since a break in the strand represents a particularly significant event, by means of which the normal course of the change in tension is changed.
  • 14 means the mold wall, which is surrounded by the jacket 6, with the cooling water flowing through the intermediate space.
  • two strain gauges 13 are arranged, one of which measures the tension or elongation in the longitudinal direction and the other in the transverse direction to the strand.
  • the strain gauges are connected to a current source via resistors R1 and R2.
  • the flowing current is in the amplifier V amplified and shown in oscillograph 0.
  • the oscillograph has a further input for the control pulses of the drive control A.
  • the pulses from the amplifier also go to a wave analyzer W, in which an acoustic signal generator S is actuated when a threshold value is exceeded or undershot, and a signal is also output to the drive control, as a result of which the pull-off motor M pushes the string back by less than one step length.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Forging (AREA)
  • Measurement Of Radiation (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Pinball Game Machines (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
EP81890155A 1980-10-01 1981-09-24 Procédé de commande pour l'extraction de barres Expired EP0049238B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81890155T ATE9656T1 (de) 1980-10-01 1981-09-24 Verfahren zur steuerung des strangabzuges.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3037048 1980-10-01
DE19803037048 DE3037048A1 (de) 1980-10-01 1980-10-01 Verfahren zur steuerung des strangabzuges

Publications (3)

Publication Number Publication Date
EP0049238A2 true EP0049238A2 (fr) 1982-04-07
EP0049238A3 EP0049238A3 (en) 1982-05-05
EP0049238B1 EP0049238B1 (fr) 1984-10-03

Family

ID=6113327

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81890155A Expired EP0049238B1 (fr) 1980-10-01 1981-09-24 Procédé de commande pour l'extraction de barres

Country Status (9)

Country Link
US (1) US4437509A (fr)
EP (1) EP0049238B1 (fr)
JP (1) JPS5785661A (fr)
AT (1) ATE9656T1 (fr)
BR (1) BR8106302A (fr)
CA (1) CA1176818A (fr)
DE (2) DE3037048A1 (fr)
ES (1) ES505707A0 (fr)
ZA (1) ZA815683B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0111000A1 (fr) * 1982-05-31 1984-06-20 Nippon Kokan Kabushiki Kaisha Procede de controle d'endommagements d'une coquille solidifiee d'une piece coulee metallique produits pendant le demoulage de la piece coulee d'une machine de moulage horizontale en continu
EP0174146A2 (fr) * 1984-09-05 1986-03-12 Nippon Kokan Kabushiki Kaisha Procédé de commande de barre dans une installation de coulée continue horizontale
EP0426501A1 (fr) * 1989-11-03 1991-05-08 Steel Casting Engineering, Ltd. Système de commande du mouvement, par exemple pour un dispositif de coulée continue horizontale

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58209455A (ja) * 1982-05-31 1983-12-06 Nippon Kokan Kk <Nkk> 水平連続鋳造鋳片の引抜き監視法
DE3426169C2 (de) * 1984-07-16 1986-06-05 Mannesmann AG, 4000 Düsseldorf Verfahren und Horizontalstranggießkokille zum Horizontalstranggießen von Metall, insbes. von Stahl, zu dünnen und breiten Strängen
DE4137588C2 (de) * 1991-11-15 1994-10-06 Thyssen Stahl Ag Verfahren zum Gießen von Metallen in einer Stranggießanlage
EP1582600A1 (fr) * 2004-03-29 2005-10-05 Fata Aluminium S.p.A. Procédé et dispositif pour refroidir les pièces coulées
US7766036B2 (en) 2004-11-12 2010-08-03 Lg Electronics Inc. Discharge valve and valve assembly of reciprocating compressor having the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2504986B2 (de) * 1975-02-04 1977-05-18 Mannesmann AG, 4000 Düsseldorf Verfahren und vorrichtung zur kontrolle und vermeidung einer kritischen verformung der strangschale
DE2501868B2 (de) * 1975-01-15 1977-12-08 Mannesmann AG, 4000 Düsseldorf Verfahren zur regelung und ueberwachung des stranggiessens von stahl
US4134440A (en) * 1974-09-16 1979-01-16 Nippon Kokan Kabushiki Kaisha Method of continuously casting steel
EP0008692A1 (fr) * 1978-08-11 1980-03-19 Concast Holding Ag Procédé pour éviter d'endommager les galets de guidage de la coulée d'un dispositif de coulée continue pour l'acier
DE2340636C3 (de) * 1973-08-10 1980-04-24 Siemens Ag, 1000 Berlin Und 8000 Muenchen Einrichtung zum schrittweisen Ausziehen eines Stranges aus einer horizontalen Stranggießkokille

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2340636C3 (de) * 1973-08-10 1980-04-24 Siemens Ag, 1000 Berlin Und 8000 Muenchen Einrichtung zum schrittweisen Ausziehen eines Stranges aus einer horizontalen Stranggießkokille
US4134440A (en) * 1974-09-16 1979-01-16 Nippon Kokan Kabushiki Kaisha Method of continuously casting steel
DE2501868B2 (de) * 1975-01-15 1977-12-08 Mannesmann AG, 4000 Düsseldorf Verfahren zur regelung und ueberwachung des stranggiessens von stahl
DE2504986B2 (de) * 1975-02-04 1977-05-18 Mannesmann AG, 4000 Düsseldorf Verfahren und vorrichtung zur kontrolle und vermeidung einer kritischen verformung der strangschale
EP0008692A1 (fr) * 1978-08-11 1980-03-19 Concast Holding Ag Procédé pour éviter d'endommager les galets de guidage de la coulée d'un dispositif de coulée continue pour l'acier

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0111000A1 (fr) * 1982-05-31 1984-06-20 Nippon Kokan Kabushiki Kaisha Procede de controle d'endommagements d'une coquille solidifiee d'une piece coulee metallique produits pendant le demoulage de la piece coulee d'une machine de moulage horizontale en continu
EP0111000A4 (fr) * 1982-05-31 1984-09-19 Nippon Kokan Kk Procede de controle d'endommagements d'une coquille solidifiee d'une piece coulee metallique produits pendant le demoulage de la piece coulee d'une machine de moulage horizontale en continu.
EP0174146A2 (fr) * 1984-09-05 1986-03-12 Nippon Kokan Kabushiki Kaisha Procédé de commande de barre dans une installation de coulée continue horizontale
EP0174146A3 (en) * 1984-09-05 1987-01-21 Nippon Kokan Kabushiki Kaisha Billet control method in a horizontal continuous casting system
EP0426501A1 (fr) * 1989-11-03 1991-05-08 Steel Casting Engineering, Ltd. Système de commande du mouvement, par exemple pour un dispositif de coulée continue horizontale

Also Published As

Publication number Publication date
ES8206232A1 (es) 1982-08-16
CA1176818A (fr) 1984-10-30
US4437509A (en) 1984-03-20
ZA815683B (en) 1983-08-31
JPS5785661A (en) 1982-05-28
EP0049238B1 (fr) 1984-10-03
EP0049238A3 (en) 1982-05-05
ATE9656T1 (de) 1984-10-15
BR8106302A (pt) 1982-06-22
DE3037048A1 (de) 1982-04-29
ES505707A0 (es) 1982-08-16
DE3166496D1 (en) 1984-11-08

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