EP0033119A1 - Démarrage de la coulée continue avec une lingotière continue - Google Patents

Démarrage de la coulée continue avec une lingotière continue Download PDF

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Publication number
EP0033119A1
EP0033119A1 EP81100378A EP81100378A EP0033119A1 EP 0033119 A1 EP0033119 A1 EP 0033119A1 EP 81100378 A EP81100378 A EP 81100378A EP 81100378 A EP81100378 A EP 81100378A EP 0033119 A1 EP0033119 A1 EP 0033119A1
Authority
EP
European Patent Office
Prior art keywords
strand
head according
head
dovetail
boundary surface
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.)
Ceased
Application number
EP81100378A
Other languages
German (de)
English (en)
Inventor
Bernhard Knell
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.)
SMS Concast AG
Original Assignee
Concast Holding 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 Concast Holding AG filed Critical Concast Holding AG
Publication of EP0033119A1 publication Critical patent/EP0033119A1/fr
Ceased 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
    • B22D11/08—Accessories for starting the casting procedure
    • B22D11/081—Starter bars
    • B22D11/083—Starter bar head; Means for connecting or detaching starter bars and ingots

Definitions

  • the invention relates to a start-up head for continuous steel casting plants with a continuous mold, the start-up head being provided with an essentially dovetail-shaped coupling part which creates a connection in the strand pull-out direction with the cast strand and can be uncoupled by a relative movement between the start-up head and the cast strand which is provided approximately transversely to the strand pull-out direction .
  • a start-up line with a start-up head is required.
  • the cross section of this start-up head matches the mold cavity and fits into it with only a small amount of side play.
  • the gaps between its outer sides and the mold walls are sealed in order to avoid start-up breakthroughs.
  • the steel cast into the mold cavity at the start of casting solidifies on contact with the cooled mold walls and the cold start-up head. Due to certain design features of the start-up head, after solidification, a positive connection is formed between it and the hot strand, which makes it possible to pull the cast strand out of the mold using the start-up strand. After the drive rollers, the start-up line is separated from the warm line.
  • the solidification time for the formation of the cast coupling member for a safe start-ACTION sufficient when casting with non-adjustable Ausgussdüsen the intermediate vessel and high casting speeds not, and a tearing of the cast coupling part followed by A is nfahr mitbruch not be excluded.
  • the emergency gutter is customary so that an interruption of the metal inflow is achieved. The use of the emergency gutter disrupts the workplaces on the casting platform due to steel splashing around, increases the risk of accidents for the casting team and causes steel losses. The advantages of automatic pouring cannot be used either.
  • the invention has for its object to provide a permanent starting head that overcomes the disadvantages mentioned and that allows trouble-free starting, even at high casting speeds. Furthermore, the advantages achieved in the prior art, such as security against unwanted decoupling in a secondary cooling zone with few guide rollers, easy sealability in the mold and a safe automatic decoupling at the intended decoupling point are to be retained in full.
  • the dovetail-shaped coupling part consists of a raised dovetail-shaped body which essentially has a trapezoidal base, a boundary surface of the raised body is aligned with the boundary surface of the start-up head arranged in the direction of strand extraction, and at least the two opposite undercuts of the other three boundary surfaces exhibit.
  • the raised dovetail-shaped body of this start-up head together with the mold wall, causes the coupling part that forms on the hot strand to solidify rapidly, because on the one hand the heat from the cast coupling part through the cooled copper wall of the mold to the outside and, on the other hand, through a tight fit of the coupling part that forms is dissipated on the body.
  • the first star delay time of the cast coupling part by the currents m ungsusion favorable influence of the cast steel in the region of the raised body.
  • An interruption of the S tahlzuhnes by Notrinne is also at high G iess Anlagenen not longer necessary, so that eliminated all the drawbacks of the use of Notrinne.
  • This A nfahrkopf also allows an automatic casting-on at high casting speeds. When using the ER f indungsgemässen dummy bar can be dispensed with the use of prepared cooling scrap parts.
  • the setting time of the cast coupling part can also be reduced if, according to a further characteristic of the invention, the n from the dovetail s body covered area is at least about 40% of the area of the end face of the dummy bar.
  • the invention proposes that the undercuts of the two boundary surfaces abutting the fourth boundary surface end in roof-shaped sealing edges. This measure results in a quick and reliable application of a seal.
  • the invention recommends dimensioning the gap between the undercut boundary surfaces of the body and the mold cavity boundary at most 25 mm wide.
  • the choice of the length of the decoupling path represents an influencing factor for the safety against undesired decoupling. According to the invention, it is advantageous if a decoupling path of at least 20 mm is provided. An extension of this path can be achieved in an advantageous manner if the tightening angles ⁇ 'and ⁇ ' on the body are of the same size.
  • the undercut As a further advantageous embodiment of the starting head according to the invention, it is proposed to design the undercut as a fillet. This results in a uniform solidification of the cast coupling part, generates less heat build-up in the body and ensures better detachment when uncoupling. Furthermore, the life of the head is increased.
  • the invention further recommends providing an included angle ⁇ between 80 0 to 89 0 between the end face of the body and the boundary surface. This measure also makes decoupling easier.
  • the invention proposes, in continuous casting plants with at least partially curved strand guidance, to provide the boundary surface of the body aligned with the boundary surface of the starting head on the inside of the curved strand guidance and the decoupling point after the straightening unit. It could be noted that when using these teachings during the passage of the coupling position by the leveling unit, a bending of the cast couplings surprisingly lu ngs learnerss and takes place by a lifting of the shrinkage force. A safe uncoupling with minimal forces acting transversely to the direction of the strand running can thus be achieved.
  • Strength in F. 1 shows a starting head 2 within a continuous mold 3. 2-4, the mold is omitted.
  • the starting head 2 is provided with an essentially dovetail-shaped coupling part which consists of a raised dovetail-shaped body 4 which is delimited by hatching from the starting head 2.
  • this body 4 creates a connection with a cast strand, which is provided by a relative movement approximately transverse to the strand pull-out direction 5 supply, for example by a force device, can be uncoupled between the starting head 2 and the cast strand.
  • the raised dovetail-shaped body 4 has an essentially trapezoidal base surface, a boundary surface 18 of the body 4 being aligned with the boundary surface 18 'of the starting head 2 which is arranged in the direction of strand extraction 5.
  • Another three boundary surfaces 15, 16, 17 have undercuts 20.
  • the undercut may be omitted from the boundary surface 15 if desired. In practice, it is often sufficient to provide only the two opposite boundary surfaces 16, 17 with undercuts 20.
  • the raised body 4 is dimensioned such that it covers a total of at least about 40 of the area of an end face 7 of the starting head 2.
  • the area projected by the body 4 onto the end face 7 is decisive as the covered area.
  • 8 shows the length of the body 4
  • 9 shows the width of the gap between an undercut boundary surface 15 of the body 4 and the mold cavity boundary.
  • the width of the gap 9 is at most 25 mm.
  • 11 sealing cords for sealing the start head 2 are designated.
  • Such sealing cords 11 have a diameter of between 10-20 mm, depending on the size of the format.
  • the covered area is at least 50% and with a mold cavity cross-sectional area from 260 cm 2 at least 60%.
  • the undercuts 20 on the opposite boundary surfaces 16 and 17 run in the direction of the fourth boundary surface 18 into a roof-shaped sealing edge 21.
  • Angle is the tightening angle of the projecting dovetail part and angle is the tightening angle of the undercut dovetail part.
  • a decoupling path 23 is formed, which is advantageously at least 20 mm.
  • the angle ⁇ is advantageously chosen to be 3-5 ° and the angle ⁇ is 6-10 °.
  • the undercuts 20 are formed as fillets and all edges of the body 4 are rounded or beveled.
  • An angle ⁇ enclosed between the end face 19 of the body 4 and the boundary surface 18 is between 80 and 89.
  • 40 is a bent cast strand.
  • the tip of this strand 40 has been directed in a drive straightening unit 41 and is located in a decoupling point 42.
  • a starting strand 44 can be uncoupled from the cast strand 40 by a force acting in the direction 43, for example generated by a piston-cylinder unit.
  • the boundary surface 18 of the body 4 which is aligned with the boundary surface 18 'of the starting head, is provided on the inside 46 of the curved strand guide.
  • Strength in F. 7 is the trapezoidal base surface of the dovetail-shaped body 4 'with a round strand cross section shown.
  • the essentially trapezoidal base area is enclosed by the straight boundary surfaces 15 ′, 16, 17 and the circular boundary surface 30.
  • the starting head according to the invention is particularly well suited for billet or bloom ingot continuous casting plants.
  • the head can also be used for polygonal formats. This applies to the same extent for continuous casting plants with a straight or curved mold or a straight and / or curved strand guide.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP81100378A 1980-01-25 1981-01-20 Démarrage de la coulée continue avec une lingotière continue Ceased EP0033119A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH605/80 1980-01-25
CH60580 1980-01-25

Publications (1)

Publication Number Publication Date
EP0033119A1 true EP0033119A1 (fr) 1981-08-05

Family

ID=4190861

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81100378A Ceased EP0033119A1 (fr) 1980-01-25 1981-01-20 Démarrage de la coulée continue avec une lingotière continue

Country Status (11)

Country Link
US (1) US4381030A (fr)
EP (1) EP0033119A1 (fr)
JP (1) JPS56109147A (fr)
BR (1) BR8100309A (fr)
ES (1) ES8205601A1 (fr)
FI (1) FI810161L (fr)
IL (1) IL61948A0 (fr)
NO (1) NO810248L (fr)
PT (1) PT72381B (fr)
YU (1) YU7681A (fr)
ZA (1) ZA81482B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0128328A1 (fr) * 1983-05-11 1984-12-19 Concast Service Union Ag Procédé de découpage de l'extrémité éboutée d'une barre au moyen d'une cisaille dans une installation de coulée continue

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3810304C1 (fr) * 1988-03-24 1989-12-07 Mannesmann Ag, 4000 Duesseldorf, De
US7004229B2 (en) * 2003-12-11 2006-02-28 Novelis, Inc. Method and apparatus for starting and stopping a horizontal casting machine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4149582A (en) * 1977-07-28 1979-04-17 Concast Incorporated Dummy bar head for continuous casting and method of starting a continuously cast strand

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1954107B2 (de) * 1962-05-21 1973-07-19 Anfahrstrang fuer metall-, insbesondere stahlstranggiessanlagen
CH463711A (de) * 1967-04-06 1968-10-15 Concast Ag Verfahren zum Stranggiessen von Metall und Vorrichtung zur Durchführung des Verfahrens
NL159605B (nl) * 1968-04-29 1979-03-15 Concast Ag Startkop voor het bij het begin van het gieten van metaal in een gekoelde, verticale strenggietcoquille afdichten van de aan de onderzijde van de coquille gelegen opening.
US3602290A (en) * 1968-08-23 1971-08-31 Mclouth Steel Corp Dummy bar for continuous casting
US3643731A (en) * 1969-05-27 1972-02-22 United States Steel Corp Detachable joint between continuous-casting starter bar and casting
CH504256A (de) * 1970-01-27 1971-03-15 Concast Ag Anfahrkopf zum Giessen von Strangquerschnitten unterschiedlicher Breiten in einer Stranggiessanlage
SU456676A1 (ru) * 1972-09-25 1975-01-15 Металлургический Завод "Сарканайс Металургс" Затравка
GB1503487A (en) * 1975-01-30 1978-03-08 British Steel Corp Continuous casting
AT348170B (de) * 1977-03-25 1979-02-12 Voest Ag Anfahrstrang fuer stranggiessanlagen
DE2731187A1 (de) * 1977-07-09 1979-01-18 Helmuth Winkler Kokille fuer strangguss von metall
AT363208B (de) * 1979-10-08 1981-07-27 Voest Alpine Ag Anfahrstrangkopf fuer eine stranggiessanlage

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4149582A (en) * 1977-07-28 1979-04-17 Concast Incorporated Dummy bar head for continuous casting and method of starting a continuously cast strand

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0128328A1 (fr) * 1983-05-11 1984-12-19 Concast Service Union Ag Procédé de découpage de l'extrémité éboutée d'une barre au moyen d'une cisaille dans une installation de coulée continue

Also Published As

Publication number Publication date
ZA81482B (en) 1982-02-24
IL61948A0 (en) 1981-02-27
ES499385A0 (es) 1982-07-01
PT72381A (en) 1981-02-01
ES8205601A1 (es) 1982-07-01
NO810248L (no) 1981-07-27
FI810161L (fi) 1981-07-26
PT72381B (en) 1982-01-05
JPS56109147A (en) 1981-08-29
BR8100309A (pt) 1981-08-04
YU7681A (en) 1983-10-31
US4381030A (en) 1983-04-26

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

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AK Designated contracting states

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

17P Request for examination filed

Effective date: 19810615

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: CONCAST HOLDING AG

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18R Application refused

Effective date: 19831020

RIN1 Information on inventor provided before grant (corrected)

Inventor name: KNELL, BERNHARD