EP0417492B1 - Coulée continue verticale et appareil de coulée - Google Patents

Coulée continue verticale et appareil de coulée Download PDF

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Publication number
EP0417492B1
EP0417492B1 EP90115569A EP90115569A EP0417492B1 EP 0417492 B1 EP0417492 B1 EP 0417492B1 EP 90115569 A EP90115569 A EP 90115569A EP 90115569 A EP90115569 A EP 90115569A EP 0417492 B1 EP0417492 B1 EP 0417492B1
Authority
EP
European Patent Office
Prior art keywords
strand
light reduction
solidification
continuous casting
reduction means
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
EP90115569A
Other languages
German (de)
English (en)
Other versions
EP0417492A3 (en
EP0417492A2 (fr
Inventor
Kiyoshi Morii
Shuzo Kumura
Shyzunori Hayakawa
Yoshio Inagaki
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.)
Daido Steel Co Ltd
Original Assignee
Daido Steel Co Ltd
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 Daido Steel Co Ltd filed Critical Daido Steel Co Ltd
Publication of EP0417492A2 publication Critical patent/EP0417492A2/fr
Publication of EP0417492A3 publication Critical patent/EP0417492A3/en
Application granted granted Critical
Publication of EP0417492B1 publication Critical patent/EP0417492B1/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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • 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
    • B22D11/14—Plants for continuous casting
    • B22D11/141—Plants for continuous casting for vertical casting

Definitions

  • the invention relates to a continuous casting method, wherein a strand formed in a water-cooled mold is drawn down by pairs of rollers vertically therefrom with reducing the strand prior to the solidification point. Furthermore, the invention relates to a vertical continuous casting apparatus comprising a water-cooled mold and its ancillary equipment, reduction means for reducing the strand, drawing drive rolls, and a strand cutter, both positioned downward the water-cooled mold and provided with means for feeding a molten metal to the water-cooled mold.
  • a method and an apparatus of these types are known from WO 87/00099.
  • the invention relates to an improvement of a vertical continuous casting or casting technique of obtaining cast pieces through drawing a strand formed in a water-cooled mold downward without incurvating, and cutting the strand.
  • a continuous casting process holds an important position in steel casting.
  • a horizontal continuous casting process is something problematical in a technical aspect, and hence is only tried in part, and thus what is overwhelming today is a curved and vertical continuous casting.
  • the vertical continuous casting is rather disadvantageous to require a high structure for the equipment, entailing a high cost of equipment.
  • employed prevailingly is the curved continuous casting wherein a strand is incurvated (a water-cooled mold being structured practically so as to provide the curved strand) to extend horizontally, thereby keeping a height of the casting equipment within a certain limit.
  • the strand extending horizontally is rectified to be straight with pinch rolls and cut with a frame cutter into cast pieces.
  • the internal casting space of the mold is imparted with a substantially spindle-shaped cross-section providing a central portion having a large thickness enabling the introduction of the molten metal stream in normal conditions and having on its sides a reduced thickness corresponding to that of the product to be formed and, into a thickness reducing cage placed immediately at the outlet of the mold, the central portion of the product is progressively flattened until a thickness equal to that of the sides is obtained by exerting throughout the product surface a uniformly distributed pressure so as to continuously straighten the longitudinal walls of the product achieved at the same time as the solidification process at the outlet of the thickness reducing cage.
  • the object of this invention is to provide a method and apparatus for vertical continuous casting wherein a light reduction is applied to a strand at an optimal position at all times in coping flexibly with casting conditions fluctuating frequently so that the cast pieces of superior quality may be produced.
  • this object is achieved with a continuous casting method of the type mentioned in the beginning, which is characterized in that a solidification completing point of the strand is determined; that light reduction means comprising pairs of rollers and capable of being variably positioned is positioned just prior to the solidification completing point of the strand; and that light reduction strong enough to compensate for contraction caused by solidification is applied to the strand.
  • the above object is achieved with a vertical continuous casting apparatus of the type mentioned in the beginning, which is characterized in that light reduction means comprising pairs of rollers is provided variably in position downward the water-cooled mold so as to apply light reduction strong enough to compensate contraction caused by solidification to the strand just prior to the solidification completing point of the strand.
  • the method of the present invention comprises, as shown in Fig. 1, positioning light reduction means 4, or pinch rolls representatively, just prior to a solidification completing point of a strand 5A or a point at which an unsolidified portion 52 within a shell 51 disappears, applying light reduction strong enough to compensate contraction caused by solidification of the strand.
  • the apparatus of the present invention comprises providing light reduction means 4 variably in position downward the water-cooled mold so as to apply light reduction strong enough to compensate contraction due to solidification to the strand just before the solidification completing point of the strand.
  • a reference character 5B denotes a cast piece obtained from cutting the strand, which will be carried away by a separate device one by one.
  • the light reduction means and a technique for providing it variably in position are arbitrary, however, devices shown in Fig. 3 to Fig. 5 will be exemplified as typical.
  • the device is constructed such that three pairs of pinch rolls 41a, 41b, 41c are mounted on a frame 42, and the frame 42 is made movable vertically along four pieces of vertical guide columns 43.
  • Each pinch roll is mounted slidably on the frame to advance and retreat by hydraulic cylinders 44a, 44b, 44c fixed on the frame to pinch the strand 5A from opposite sides, driven by motors 45a, 45b, 45c, and is capable of applying a desired light reduction on the strand metal.
  • Positions of the pinch rolls 41a to c can be changed by worm-jack mechanisms 7 moving vertically from having four pieces of vertical bars 46 on a lower portion of the frame 42 rotated according to rotations of a motor 6 and male screws of the vertical bars engaged with fixed female screws.
  • Fig. 6 indicates another mode of providing the light reduction means variably in position.
  • a construction of the light reduction means namely, the frame and the pinch rolls fitted thereon and other parts is same as the example described above, however, what is different is that a vertical movement of the frame is realized by taking up and delivering a wire 9 laid on pulleys 8a, 8b, 8c, 8d and 8e.
  • a position of the light reduction means is made variable, adjusted to a solidification completing point fluctuating according to conditions such as steel kind to be subjected to the continuous casting, sectional size of a strand, drawing speed and others, and from carrying out a light reduction at an optimal position, the effect will be enhanced so high.
  • a techinque for detecting a solidification completing point by utilizing the phenomenon that a propagation speed of ultrasonic wave varies in solid and liquid. It is therefore preferable that a device for detecting a solid/liquid interface on an ultrasonic wave is added to the light reduction means 4, a solidification completing point in a strand is found to postion the light reduction means in starting the operation, light reduction is thus performed precisely, and when the solidification completing point fluctuates according to changes in steel kind to be subjected to the continuous casting and in casting conditions, the light reduction means is made to follow thereto and the position is modified accordingly.
  • the strand is drawn by the aforementioned drawing drive rolls, therefore a driving force is not required for the light reduction pinch rolls to have.
  • the light reduction pinch rolls will be utilized advantageously for inserting dummy bars into the water-cooled mold when starting the casting operation.
  • the object is attained by providing a driving function to the light reduction pinch rolls, therefore, the aforementioned apparatus is provided with a driving motor.
  • a light reduction just prior to a solidification completing point in casting a special steel vertically and continuously can be now realized at an optimal position always corresponding to the strand sectional size and changes in casting conditions.
  • a quality product is ready for securing in meeting severe requirements on quality for the special steel such as prevention of center cavities, lessening of center segregation and so forth.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Claims (5)

  1. Procédé de coulée continue, dans lequel un ruban de métal (5A) formé dans un moule refroidi à l'eau (1) est étiré vers le bas par des paires de rouleaux espacées verticalement à partir du moule, avec réduction de section du ruban avant le point de solidification, caractérisé en ce qu'on détermine un point de fin de solidification du ruban ; on dispose des moyens de réduction légère (4), comprenant des paires de rouleaux et dont la position peut être modifiée, juste avant le point de fin de solidification du ruban (5A) ; et on applique au ruban (5A) une légère réduction suffisante pour compenser la contraction résultant de la solidification.
  2. Appareil de coulée continue verticale comprenant un moule refroidi à l'eau (1) et son équipement auxiliaire, des moyens de réduction pour réduire la section du ruban de métal (5A), des rouleaux d'entraînement d'étirage (2) et une cisaille de ruban (3), tous placés en aval du moule refroidi à l'eau (1), et comportant des moyens d'amenée d'un métal fondu au moule refroidi à l'eau (1), caractérisé en ce que des moyens de réduction légère (4) comprenant des paires de rouleaux sont prévus à une position variable en aval du moule refroidi à l'eau (1) de façon à appliquer au ruban (5A) une légère réduction suffisamment forte pour compenser la contraction résultant de la solidification, juste avant le point de fin de solidification du ruban (5A).
  3. Appareil de coulée continue suivant la revendication 2, caractérisé en ce qu'un dispositif de détection d'une interface solide/liquide au moyen d'ultrasons est ajouté aux moyens de réduction légère (4) pour déterminer le point de fin de solidification du ruban afin de placer les moyens de réduction légère (4) à ce point et, lorsque le point de fin de solidification varie, on modifie la position des moyens de réduction légère (4) conformément à ce point.
  4. Appareil de coulée continue suivant la revendication 2 ou 3, caractérisé en ce que les moyens de réduction légère (4) peuvent coulisser dans un cadre (42) déplaçable verticalement le long de montants de guidage verticaux (43), et ils comprennent au moins une paire de rouleaux de pincement (41a,41b,41c) agencés de manière à pincer le ruban de métal (5A) de chaque côté de celui-ci, sous l'action de vérins hydrauliques (44a,44b,44c).
  5. Appareil de coulée continue suivant la revendication 4, caractérisé en ce que les rouleaux de pincement (41a,41b,41c) des moyens de réduction légère (4) possèdent une fonction d'entraînement pour servir en même temps de rouleaux de pincement de barres factices.
EP90115569A 1989-08-16 1990-08-14 Coulée continue verticale et appareil de coulée Expired - Lifetime EP0417492B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP21106789 1989-08-16
JP211067/89 1989-08-16
JP2164256A JP2964560B2 (ja) 1989-08-16 1990-06-25 垂直連続鋳造装置
JP164256/90 1990-06-25

Publications (3)

Publication Number Publication Date
EP0417492A2 EP0417492A2 (fr) 1991-03-20
EP0417492A3 EP0417492A3 (en) 1992-05-13
EP0417492B1 true EP0417492B1 (fr) 1995-04-19

Family

ID=26489436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90115569A Expired - Lifetime EP0417492B1 (fr) 1989-08-16 1990-08-14 Coulée continue verticale et appareil de coulée

Country Status (3)

Country Link
EP (1) EP0417492B1 (fr)
JP (1) JP2964560B2 (fr)
DE (1) DE69018740T2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19941120A1 (de) * 1999-08-25 2001-07-05 Mannesmann Ag Verfahren zur Beurteilung des Bereiches der Mittenebene von Stranggußbrammen

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4010966A1 (de) * 1990-04-05 1991-10-10 Schloemann Siemag Ag Vorrichtung zur stuetzung eines metallgiessstranges, insbesondere zur weichreduktion bei einer vorband-giessanlage
DE4138740A1 (de) * 1991-11-26 1993-05-27 Schloemann Siemag Ag Verfahren und vorrichtung zum stranggiessen von brammen oder bloecken
JP3257224B2 (ja) * 1994-01-14 2002-02-18 大同特殊鋼株式会社 連続鋳造方法
JP2001205407A (ja) * 2000-01-25 2001-07-31 Nippon Steel Corp ビレットの連続鋳造方法
JP5741402B2 (ja) * 2011-11-25 2015-07-01 新日鐵住金株式会社 円形断面鋳片の連続鋳造方法
ES2651136T3 (es) * 2012-05-24 2018-01-24 Nippon Steel & Sumitomo Metal Corporation Método para colar planchón de manera continua
CN108941493A (zh) * 2018-08-30 2018-12-07 东北大学 一种实验室用小方坯立式连铸机辊列及其使用方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1451901A (fr) * 1965-11-02 1966-01-07 G Sojuzny I Projektirovanya Me Dispositif de guidage dans la zone du refroidissement secondaire pour installations de coulée continue de métaux
AU419372B1 (en) * 1966-03-07 1971-12-01 Guiding device for ingots in secondary cooling zone in continuous casting plants
CH440569A (de) * 1966-12-28 1967-07-31 Moossche Eisenwerke Ag Verfahren und Vorrichtung zum Stranggiessen von Knüppeln
FR2583662B1 (fr) * 1985-06-25 1987-09-25 Clecim Sa Procede et machine de coulee continue d'un produit metallique mince

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19941120A1 (de) * 1999-08-25 2001-07-05 Mannesmann Ag Verfahren zur Beurteilung des Bereiches der Mittenebene von Stranggußbrammen

Also Published As

Publication number Publication date
DE69018740T2 (de) 1995-09-28
EP0417492A3 (en) 1992-05-13
JP2964560B2 (ja) 1999-10-18
DE69018740D1 (de) 1995-05-24
JPH03155441A (ja) 1991-07-03
EP0417492A2 (fr) 1991-03-20

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