US3889740A - Continuous casting plant - Google Patents

Continuous casting plant Download PDF

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Publication number
US3889740A
US3889740A US376736A US37673673A US3889740A US 3889740 A US3889740 A US 3889740A US 376736 A US376736 A US 376736A US 37673673 A US37673673 A US 37673673A US 3889740 A US3889740 A US 3889740A
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US
United States
Prior art keywords
bar
guiding
mould
supporting
continuous casting
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Expired - Lifetime
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US376736A
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English (en)
Inventor
Bruno Tarmann
Johann Knorr
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Voestalpine AG
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Voestalpine AG
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Publication date
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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
    • B22D11/08—Accessories for starting the casting procedure
    • B22D11/081—Starter bars

Definitions

  • ABSTRACT relates to a continuous casting plant comprising a water-cooled mould, a supporting and guiding structure for the cast bar joining the mould, and a lateral guiding structure for a dummy bar which is connectable at one end with a dummy head closing the mould at its inside.
  • the dummy bar is exclusively composed of a flexible, elastically shapeable steel tape whose thickness is substantially smaller than the thickness of the smallest continuous bar to be cast on the plant, whose width is preferably greater than the width of the guiding and supporting structure for the cast bar, and whose margins immediately engage with the lateral guiding structure for the dummy bar and are enclosed by it at least at one side.
  • the invention relates to a continuous casting plant comprising a water-cooled mould, a supporting and guiding structure for the cast bar joining the mould and being provided preferably with rollers, and a lateral guiding structure for a dummy bar which is connectable at one end with a dummy head closing the inner space of the mould.
  • dummy bars composed of several parts similar to a link chain are used. They have the disadvantage that because of the necessary play in the joints on the one hand and because of the play between the dummy bar and the supporting and guiding structure for the cast bar on the other hand, push-like movements occur. When these movements are conveyed to the cast bar, they cause a so-called falling through of the bar in the mould and may lead to casting disturbances. It is another disadvantage of known dummy bars that they are considerably thick, i.e. their thickness corresponds to at least the thickness of the smallest bar cross section that may be cast on the plant, so that the drawing out means for the cast bar may engage the dummy bar.
  • a dummy bar comprising a flexible band member and a multiplicity of gage block elements, the thickness of these gage block elements arranged movably on the flexible band member being equal to the thickness of the continuous body to be cast (Canadian Pat. No. 733,026).
  • lt is complicated to construct this dummy bar which is as wide as the bar to be cast.
  • the drawing out means engages the gage block elements so that a considerable number of these block elements have to be distributed over the total starting length.
  • Such a dummy bar is therefore very heavy and necessitates careful servicing.
  • a beam is joined to the dummy head which is insertable into the mould.
  • This beam is wider than the supporting and guiding rollers for the cast bar, and on both sides of this beam, ropes or tapes are fixed which are guided in U- shaped guides, by means of which the cast bar may be drawn out (German provisional publication No. 2,1 14,936).
  • the ropes or tapes are relatively thin or narrow, respectively. the bar may be drawn out, but it is not possible to guide or push the dummy head from below through the supporting and guiding means for the cast bar; in this case, the ropes or tapes would buckle.
  • Another disadvantage of this invention is that the bar is drawn out obliquely when the tension elements expand irregularly, which may lead to ruptures in the bar shell.
  • the invention is aimed at avoiding the described disadvantages and at creating a dummy bar which is considerably simpler and cheaper in construction and production and which affords a high operational safety and guarantees simple handling.
  • the dummy bar comprises merely a flexible, elastically shapeable steel tape whose thickness is substantially smaller than the thickness of the smallest continuous bar to be cast on the plant, whose width is preferably greater than the width of the guiding and supporting structure for the cast bar, and whose margins immediately engage with the lateral guiding structure for the dummy bar and are enclosed by it at least at one side.
  • a relatively thin dummy bar which is guided laterally in guiding rails is known from the German printed application No. 1,583,586, but this dummy bar comprises elements which are articulately joined to one another. It is provided with individual lateral pin-shaped projections or bolts which engage with the guiding rails.
  • the link chain thus contacts the rails only at points, which fact entails the disadvantage that the pin-shaped projections or bolts are excessively stressed at the articulations of the dummy bar, subjected to a strong wear and frequently have to be renewed.
  • the disadvantages inherent'with member bars, in particular the push-like movement of the cast bar are also present.
  • the thickness of the steel tape of the invention amounts to only 3 to 20 mm.
  • the smallest bar thickness amounts to about mm in plants for billets and to about mm in plants for slabs. 1n plants for casting broad slabs, in particular for bars having a width of 1,000 to 2,000 mm, particularly great advantages are obtained when according to the invention a thin steel tape is used as dummy bar. It is possible to make do with a tape of 5 to 6 mm thickness without having to fear that the dummy bar will buckle out during guiding. The tensile strength of such a steel tape is big enough so that also the cast bar may be drawn out without plastic deformation.
  • It may also be made of steel resistant to wear containing about 1.2 C and about 12 Mn.
  • the end of the guiding structure for the dummy bar remote from the mould may be guided out of the supporting and guiding structure for the cast bar along an arcuate path and joined to a reeling means.
  • the rotation direction of the reeling means is reversible and the drive output of the motor or of the motors respectively, is such that it is possible not only to bend and straighten the steel tape, but also to draw out the cast bar from the mould. It is particularly suitable to arrange the reeling means laterally of or above or below the bar guiding structure in continuous casting plants comprising a means for direct shaping the cast bar including grooved rolls which function at the same time as drawing out means.
  • FIG. 1 is a simplified representation of a vertical sectional view of a continuous casting plant for slabs.
  • FIG. 2 is a vertical sectional view of a bar guiding structure.
  • FIG. 3 is a similar representation as FIG. 1 but of a continuous casting plant for billets with bar shaping rolls.
  • numeral 1 denotes a water-cooled mould which oscillates in a vertical direction.
  • This mould is followed by a supporting and guiding structure for the continuously cast bar, which comprises non-driven rollers 2, 3. Between these rollers, cooling means for the secondary cooling of the continuously cast bar are arranged. The cooling means are not shown in the drawing.
  • Numerals 4, 5, 6 and 7 denote driven pairs of rolls for drawing out the bar having a still-liquid core. The rolls may be adjusted to the bar. When it is completely solidified, the bar is engaged by a further pair of rolls 8 and may be deformed up to e.g. 20 percent.
  • Numeral 9 denotes a roller table on which the bar is transported to a separating means, not illustrated.
  • the supporting and guiding structure for the cast bar is arcuate below the mould 1.
  • the rollers 2 at the inner side of the arch are adjustable to different bar thicknesses and arch radii.
  • a guiding structure for a thin, e.g. mm thick, spring steel tape 11 is provided.
  • This structure is formed of laterally arranged U-shaped carriers or rails 10 lying opposite to each other. The margins of the spring steel tape are surrounded by this guiding structure (FIG. 2).
  • the width of the steel tape 11 is greater than the maximum bar width, which corresponds to about the length of the rollers 2, 3.
  • the steel tape 11 is connected with a hook-shaped dummy head 12, which is shown in FIG. 2 in a dot and dash line and whose width corresponds to the maximum bar width.
  • the hookshaped dummy head 12 is preferably releasahly connected with the steel tape 11, so that it may easily be exchanged when the mould is exchanged.
  • the dummy head is articulately connectable with the solidifled end of the cast bar so that later, by a rotatory movement, the dummy head may easily be separated from the cast bar, as this is described e.g. in Swiss Pat. No..475,049.
  • the end 10 of the lateral guiding structure for the steel tape 11 is guided out of the supporting and guiding structure along an arcuate path, preferably with a bending radius R corresponding to the roller path 2, so that the end 11 of the steel tape 11 may be guided into a reeling plant.
  • the reeling plant is composed substantially of the following parts: individually driven bending and drawing out rollers 13, 14, 15, an arcuate guiding part 17 and the idle supporting rollers 16.
  • the guiding part 17 may be slewn or rotated around a horizontal axis 19 in direction of the arrow into a position 17', shown in a dash-dot-line, by means of a cylinder, which is not shown in the drawing and which may be actuated pneumatically, for example.
  • a reeling means or three roller coiling machine is described in Schwlle Ausrustung von Walztechniken," by Kulbatschny, l.G., VEB Verlagtechnik Berlin, I954, page 972/982.
  • the dummy head 12 gets into its end position 12' shown in a broken line.
  • the upper roll 5 and some of the following rollers 2 for a short period have to be lifted from their normal positions, shown in broken lines, into positions 5' and 2', shown in full, or to be slewn or rotated out until the dummy head 12 is released from the cast bar and has passed this place. Then the upper roll 5 and the rollers 2 are adjusted to the bar and the bar is further drawn out by the pairs of rolls 4, 5 or 6, 7, 8, respectively.
  • a lateral guiding structure 10 with a substantially circular arch shape and the radius R has the advantage that the steel tape 11 need be bent only slightly so that no strong bending forces will occur.
  • the bending forces necessary for coiling up and coiling off, respectively, are practically exclusively supplied by the bending and drawing out rollers 13, I4, 15.
  • the arrangement of a reeling means within the area of the supporting and guiding structure for the cast bar has the advantage that a short dummy bar may be used and the idling time passing before the next cast may be started may be shortened because the dummy bar may already be driven into the mould 1 before the cast bar issues from the horizontal bar guiding structure.
  • the reeling means may, of course, also be built in below the bar guiding structure.
  • FIG. 2 illustrates how the carriers or guiding rails 10 may be designed. They have a C- or U-shaped cross section and may be connected integrally with the supporting means 21 for the rollers 2. Their upper margins 22 are about in alignment with the inner side of the roller path so that the rollers 2 support the central part of the steel tape 11 when the bar is drawn out. and may help when it is bent.
  • the rails 10 may also be designed in several parts or as independent, exchangeable struc tural parts.
  • Numeral 23 denotes a supporting means for the outer rollers 3.
  • numeral 24 denotes a coiler which is driven by a pole changing motor.
  • the coiler is provided with a clamping slot 25 for fixing one end of the steel tape 11.
  • the other end of the steel tape 11 reeled on the coiler 24 is again fixed to a dummy head 12", which may be driven into the mould through driven pairs of grooved rolls 26, 27 and independently of them.
  • Numeral I0" denotes the arcuate guiding structure which leads out of the supporting and guiding structure including the rollers 2, 3 and is arranged behind the pairs of grooved rolls 26. 27 forming the drawing out means for the cast bar. and is joined to the reel 24.
  • a continuous casting plant for billets with a bar cross section of 140 X 140 mm it is, for example, possible to use a unitary elastic steel tape with a cross section of 2-10 X 12 mm made ofan unalloyed carbon steel with 0.25 "/1 C.
  • thick tapes i.e. tapes of more than 6 mm width.
  • the dummy bar is moved by the drawing out rolls for the cast bar.
  • Tapes with a thickness of 3 to 6 mm may he reeled with advantage.
  • a compact steel tape it is also possible to use a continuous woven steel tape produced from a plurality of thin wires or strips which is particularly well bendable and yet provided with the buckling resistance necessary for guiding in the dummy bar.
  • the steels A and B are hot rolled spring steels, steel C is a cold-rolled strip steel and the steel D is a manganese steel resistant to wear.
  • a continuous casting plant comprising:
  • b. means extending from the mould for supporting and guiding a cast bar: a dummy bar adapted to be connected at one end to a dummy head that is insertable into the mould to close an end of the mould, the dummy bar being composed exclusively of a flexible, elastically shapeable steel tape without articulated joints and having a thickness that is generally constant along the length of the dummy bar and that is substantially smaller than the thickness of the smallest continuous bar to be cast in the plant: and
  • d. means extending from the mould for guiding the dummy bar, the guiding means being adapted to engage side margins of the dummy bar and to enclose at least one of said side margins.
  • the supporting and guiding means for the cast bar includes supporting and guiding elements arranged along an arc, the guiding means for the dummy bar is arranged along the supporting and guiding elements that lie on a radially inward side of the arc, and the steel tape at its central part is supported, guided and bent by said radially inward supporting and guiding elements.
  • the continuous casting plant set forth in claim I also comprising means for reeling up the dummy bar and at least one motor for reversibly driving the reeling means. and wherein the steel tape has a thickness of up to 6 mm and an end of the guiding means for the dummy bar remote from the mould is adapted to be moved away from the supporting and guiding means for the cast bar to define a path leading to the reeling means, the motor for the reeling means having a drive output sufficient to bend and straighten the steel tape and also the draw out a cast bar from the mould.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Pretreatment Of Seeds And Plants (AREA)
  • Piles And Underground Anchors (AREA)
US376736A 1973-01-12 1973-07-05 Continuous casting plant Expired - Lifetime US3889740A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT24873*#A AT326852B (de) 1973-01-12 1973-01-12 Anfahrvorrichtung fur stranggiessanlagen

Publications (1)

Publication Number Publication Date
US3889740A true US3889740A (en) 1975-06-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
US376736A Expired - Lifetime US3889740A (en) 1973-01-12 1973-07-05 Continuous casting plant

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US (1) US3889740A (fr)
JP (1) JPS5220010B2 (fr)
AT (1) AT326852B (fr)
BE (1) BE802724A (fr)
CA (1) CA989586A (fr)
CH (1) CH562069A5 (fr)
DE (1) DE2332888A1 (fr)
ES (1) ES416806A1 (fr)
FR (1) FR2213823A1 (fr)
GB (1) GB1440015A (fr)
IT (1) IT992853B (fr)
SE (1) SE388141B (fr)
SU (1) SU539508A3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4660616A (en) * 1986-02-26 1987-04-28 Kabushiki Kaisha Kobe Seiko Sho Starter bar apparatus in a continuous casting assembly
US5135042A (en) * 1990-11-23 1992-08-04 Gunther Behrends Self-supporting, flexible continuous casting starter bar
US20100051226A1 (en) * 2006-09-19 2010-03-04 Albrecht Girgensohn Method for the continuous casting of a metal strand

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5229433A (en) * 1975-09-02 1977-03-05 Mitsubishi Heavy Ind Ltd Dummy bar for continuous casting machine
JPS53114224A (en) * 1977-03-16 1978-10-05 Matsushita Electric Works Ltd Ceiling apparatus
DE2748690C2 (de) * 1977-10-29 1983-12-29 SMS Schloemann-Siemag AG, 4000 Düsseldorf Vorrichtung zum Lösen des Anfahrkopfes eines Anfahrstranges in einer Stranggießanlage
FR2610227B1 (fr) * 1987-02-04 1990-04-20 Siderurgie Fse Inst Rech Systeme de maintien de la tete d'ancrage d'un mannequin d'extraction dans une installation de coulee continue entre cylindres
DE3834410A1 (de) * 1988-10-10 1990-04-12 Schloemann Siemag Ag Anfahrvorrichtung fuer eine stahlbandgiessanlage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3372731A (en) * 1964-08-29 1968-03-12 Schloemann Ag Method of withdrawing the strand from a continuous casting machine
US3442322A (en) * 1966-09-09 1969-05-06 Mesta Machine Co Flexible dummy bar for continuous casting machines
US3756304A (en) * 1972-04-12 1973-09-04 Jones & Laughlin Steel Corp Method and apparatus for guiding continuously cast strip
US3765470A (en) * 1971-07-14 1973-10-16 Castagnoli S Continuous casting machine
US3773102A (en) * 1971-11-09 1973-11-20 C Gerding Direct casting of channel-shaped strip

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3372731A (en) * 1964-08-29 1968-03-12 Schloemann Ag Method of withdrawing the strand from a continuous casting machine
US3442322A (en) * 1966-09-09 1969-05-06 Mesta Machine Co Flexible dummy bar for continuous casting machines
US3765470A (en) * 1971-07-14 1973-10-16 Castagnoli S Continuous casting machine
US3773102A (en) * 1971-11-09 1973-11-20 C Gerding Direct casting of channel-shaped strip
US3756304A (en) * 1972-04-12 1973-09-04 Jones & Laughlin Steel Corp Method and apparatus for guiding continuously cast strip

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4660616A (en) * 1986-02-26 1987-04-28 Kabushiki Kaisha Kobe Seiko Sho Starter bar apparatus in a continuous casting assembly
US5135042A (en) * 1990-11-23 1992-08-04 Gunther Behrends Self-supporting, flexible continuous casting starter bar
US20100051226A1 (en) * 2006-09-19 2010-03-04 Albrecht Girgensohn Method for the continuous casting of a metal strand
US8205662B2 (en) * 2006-09-19 2012-06-26 Sms Demag Aktiengesellschaft Method for the continuous casting of a metal strand

Also Published As

Publication number Publication date
FR2213823A1 (fr) 1974-08-09
BE802724A (fr) 1973-11-16
ES416806A1 (es) 1976-02-16
JPS49101229A (fr) 1974-09-25
CA989586A (en) 1976-05-25
GB1440015A (en) 1976-06-23
DE2332888A1 (de) 1974-07-25
ATA24873A (de) 1975-03-15
SU539508A3 (ru) 1976-12-15
AT326852B (de) 1976-01-12
IT992853B (it) 1975-09-30
CH562069A5 (fr) 1975-05-30
SE388141B (sv) 1976-09-27
JPS5220010B2 (fr) 1977-06-01

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