EP0028214B1 - Anfahrstrangkopf für eine Stranggiessanlage - Google Patents

Anfahrstrangkopf für eine Stranggiessanlage Download PDF

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Publication number
EP0028214B1
EP0028214B1 EP80890103A EP80890103A EP0028214B1 EP 0028214 B1 EP0028214 B1 EP 0028214B1 EP 80890103 A EP80890103 A EP 80890103A EP 80890103 A EP80890103 A EP 80890103A EP 0028214 B1 EP0028214 B1 EP 0028214B1
Authority
EP
European Patent Office
Prior art keywords
face
recess
strand
bar head
starter bar
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
Application number
EP80890103A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0028214A1 (de
Inventor
Gerhard Dipl.-Ing. Reithner
Peter Wagner
Franz Kagerhuber
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.)
Voestalpine AG
Original Assignee
Voestalpine 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=3587396&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0028214(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Voestalpine AG filed Critical Voestalpine AG
Publication of EP0028214A1 publication Critical patent/EP0028214A1/de
Application granted granted Critical
Publication of EP0028214B1 publication Critical patent/EP0028214B1/de
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
    • B22D11/08—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 strand head for a continuous caster, in particular for a steel slab caster, with side surfaces directed and sealed against the walls of a continuous mold, with an end surface closing the continuous mold and with at least one end surface emanating from a side surface of the start-up head, the end face of the start-up head at least partially penetrating anchoring recess for the hot strand to be filled by the metal to be cast, which is extended from the end face to a bottom surface of the anchoring recess and which anchoring recess (s) has (have) at least two side walls which are arranged symmetrically to the longitudinal axis of the starting strand head and face the bottom surface the side walls of the anchoring recess (s) merge into a further recess with respect to the nearest mold inner wall, the F of which adjoins the mold side walls to be sealed smile upwards, d. H. are turned towards the end face of the starting strand head.
  • Starting strand heads with a dovetail-shaped tongue or groove are known for example from DE-PS 674136, US-PS 2 176 990, GB-PS 763 970 and FR-PS 1 470 567. These known starting strand heads are separated from the warm strand either by laterally shifting the starting strand so that the dovetail-shaped groove (or tongue) slides off the counterpart formed on the warm strand, or by opening the pliers jaws (FR-PS 1 470 567).
  • the start-up strand heads are made somewhat smaller in cross-section than the cross-section of the mold, so that a peripheral air gap of a few millimeters, for example 5 mm, is present between the mold walls and the side faces of the start-up strand head to be sealed.
  • the gap is sealed by means of sealing cords, preferably paper cords. These cords are inserted along the boundary edges of the end face or the anchoring recess running on the mold side walls and pressed manually into the gap by means of plug tools. Difficulties arise when the starting strand head - and the starting strand heads quoted at the beginning - have undercuts that are not accessible from above.
  • the sealing cord In these undercuts, the sealing cord must be pressed in from the side, which is difficult and cumbersome, since the end face of the starting strand head is usually about half a meter below the casting platform. Subsequent to the insertion of the sealing cord, cooling scrap, in particular in the form of short-chipped turnings, is poured into the mold, which cooling scrap has the task of extracting so much heat from the metal flowing into the mold at the beginning of the casting that, firstly, it does not weld to the start-up head and secondly, does not come into direct contact with the sealing cord.
  • the starting strand head has a side edge that is not visible from the casting platform, ie from above, when the starting strand head is inserted into the mold, the last requirement cannot be met, since the swarf from such an edge down onto the bottom surface of the anchoring recess or fall on the face. As a result, the sealing cord may burn out and the strand may break during start-up.
  • the sealing of the known start-up strand heads is therefore very problematic, requires extreme care and special measures, such as. B. the use of heat-resistant sealing cords.
  • DE-A-2832712 discloses a start-up strand head of the type described in the introduction, in which the further recess is delimited by a flat inclined surface which extends over the entire side surface of the start-up strand head. This avoids the fact that the sealing cord has to be inserted into undercuts in the anchoring recess, but in this known embodiment of a start-up strand head the inclined surface delimiting the recess must form an acute angle with the side surface of the start-up strand head from which the anchoring recess starts. This inclined surface also forms an acute angle with the corresponding mold side wall, which means that the insertion of the sealing cord and exact sealing are still not satisfactorily possible. Depending on the inclination of the inclined surfaces, this known starting strand head is more or less hampered by the wedge-shaped tapering gap which the inclined surface forms with the corresponding mold side wall.
  • the invention aims to avoid these disadvantages and difficulties and has as its object to design a start-up strand head of the type described in such a way that an easy-to-carry out seal is possible, the risk of start-up breakthroughs being largely reduced.
  • the accessibility of the gap receiving the sealing cord between the start-up strand head and the mold side walls is to be considerably improved, although the start-up line can still be separated from the warm line in a simple manner and within a short period of time, and in spite of good anchoring in the start-up line.
  • This task is there according to the invention solved by that the extending from the bottom surface to the front surface further recess in the nearest side surface of the start strand head, from which the anchoring recess starts, merges with a surface that encloses an approximately right angle with this side surface of the start strand head. Characterized in that a surface of the further recess is directed approximately at right angles to the side surface of the start strand head from which the anchoring recess starts, a much better accessibility of the gap between the corresponding mold side wall and these side surfaces of the start strand head is achieved.
  • the sealing cord can be attached more easily and it is also easier to check that the sealing cord has been properly attached, as a result of which the risk of breakdowns is significantly reduced.
  • the further recess is pyramid-shaped, the base of the pyramid being arranged on the end face and the tip of the pyramid being arranged on the bottom face.
  • FIG. 1 shows a starting strand head in oblique view according to a first embodiment.
  • 1 shows a detail of a starting strand head according to FIG. 1 according to a second variant.
  • FIG. 3 illustrates a further embodiment of a starting strand head in a representation analogous to FIG. 1.
  • the starting strand head 1, of which only the upper end part is shown, is articulated in a known manner, for example by means of a hinge pin, to a flexible starting strand formed from link bodies.
  • the width 2 and the thickness 3 of the starting strand head having a rectangular cross section are each about 8 to 10 mm smaller than the corresponding mold dimensions.
  • the start-up head has broad side surfaces 4, 4 'and narrow side surfaces 5, 5' directed against the walls of the continuous mold, which at the upper end merge into an end surface 6 of the head.
  • a dovetail groove 7 extends from a front broad side surface 4 across the starting strand head 1, which represents an anchoring recess for the warm strand. This groove passes through the end face 6 and is filled with liquid metal when the hot strand is poured on. It is expanded from the end face 6 to the bottom face 8 and has two side walls 10, 11, which are arranged symmetrically to the longitudinal axis 9 of the start-up strand head 1 and face against the bottom face 8.
  • the two side walls 10, 11 of the anchoring recess 7 arranged symmetrically with respect to the longitudinal axis 9 form a small angle 12, preferably approximately 3 °, with one another, measured in the plane of the end face, which corresponds approximately to a draft angle of a casting mold.
  • the side surfaces of the anchoring recess thus diverge to that broad side surface 4 of the starting strand head 1 from which the anchoring recess 7 starts.
  • the bottom surface 8 advantageously forms an angle 12 of this type with the end surface 6.
  • the anchoring recess 7 runs across the entire start-up strand head, i. H. it opens into the broad side surface 4, but the anchoring recess 7 is formed by two triangular projections 13, 14 either inserted into the anchoring recess or integrally formed with the starting strand head, tapering towards the bottom surface 8. These triangular lugs 13, 14 each have an end face 15 turned against the end face 6 of the starting strand head 1, which makes it easy to insert a dash-dotted sealing cord 16 from above. On the front broad side wall 4, the groove 7 merges into a further recess 17 which is pyramid-shaped.
  • the side surfaces 18, 19 of this recess are upwards, i. H. turned towards the end face so that the sealing cord 16 can also be easily inserted from above, and the inserted cooling scrap or the turnings no longer fall off the sealing cord 16.
  • the side faces 4, 4 ', 5, 5' of the starting strand head 1 directed against the side walls of the mold are provided with bevels 20 at the transition to the end face 6.
  • the tips of the pyramid-shaped recesses 17 lie on the bottom surface 8 of the anchoring recess, and the bases in the end surface 6.
  • This start-up strand head shown in FIG. 1 has the advantage that it can be adapted to various mold widths 2 or strand widths by means of simply designed double layers 21, that is to say rectangular plates which can be mounted on the narrow side surfaces 5, 5 '.
  • the sealing cord 16 is placed around the outermost doubling 21 in each case when such doublings shown in broken lines in FIG. 1 are provided.
  • the pyramid-shaped recesses 17 have only relatively small inclined surfaces 18, 19, so that an inclined surface extending over the entire width 2 of the starting strand head is avoided.
  • Such sloping surfaces namely have the disadvantage that they cannot be easily covered with cooling scrap, which means that there is a greater risk of welding than with horizontal surfaces.
  • the starting strand head 1 is displaced in the direction of arrow 22 perpendicular to the longitudinal axis 9 and perpendicular to the broad side surface 4 of the starting strand head. Due to the slightly inclined floor surface 8 and the side walls 10, 11 of the anchoring recess 7, which are at an angle 12 to one another, a small force is sufficient for releasing the starting strand head from the warm strand. This is also because the hot strand shrinks, i.e. H. the part of the warm strand cast in the anchoring recess 7 shrinks and therefore does not tend to jam in the anchoring recess 7.
  • the groove 7 is closed against the rear broad side surface 4 'of the starting strand head, and between by means of two plates 23, 24 which are complementary to the groove cross section and can be inserted into the groove 7 and welded to the starting strand head 1 for easier insertion of the plates 23, 24, the sides directed against the side walls 10, 11 of the groove form an acute angle 25 with the side walls 10, 11 of the groove 7.
  • These plates 23, 24 can also be formed integrally with the starting strand head 1.
  • FIG. 3 A further variant is shown in Fig. 3, in which instead of the dovetail-shaped anchoring recess 7, a dovetail-shaped spring 26 is provided, so that the anchoring recess on the starting strand head 1 'is divided into two and is in each case adjacent to a narrow side wall.
  • Both anchoring recesses 27, 28 are closed by plate-shaped projections 29 toward the rear broad side of the start-up strand head.
  • the plate-shaped lugs are provided with boundary surfaces 30 which face upwards, i. H. are turned towards the end face 6 so that the boundary edge 31 formed with this boundary surface 30 is accessible from above on the side wall.
  • the anchoring recesses 27, 28 merge into further prism-shaped recesses 32, with the boundary surface 33 of the further recesses 32 adjoining the broad side 4 rising upwards, i. H. is turned towards the end face 6.
  • each prism-shaped recess 32 merging into the broad side surface 4 encloses a right angle with the broad side surface 4, as a result of which the gap between the mold and the starting strand head is also easily accessible.
  • the sealing cord 16 can also be inserted and pressed in from above in a simple manner.
  • the symmetrical arrangement of the side walls 10, 11 in all of the described embodiments enables a central force transmission between the warm strand and the starting strand, so that no transverse forces and moments arise on the starting strand head 1, 1 'or on the warm strand due to the restraining or pulling force, which transverse forces and Moments could lead to an increased load on the strand guide, the warm strand and the start-up strand.
  • the invention is not limited to the exemplary embodiments shown in the drawing, but can be modified in various ways.
  • the recesses do not have to be dovetail-shaped, but they can also have a hammer head-like cross section.
  • the inclination of the surfaces 18, 33 of the further recesses 17, 32 adjoining the starting strand head walls to be sealed can be chosen as desired. It is only necessary that these surfaces 18, 33 enclose an angle of less than 270 ° with the end face 6 of the starting strand head 1, 1 'and an angle of more than 90 ° with the bottom surface 9. These surfaces do not have to be flat; they can also be curved.
  • All of the exemplary embodiments show a start-up strand head for a steel slab caster, but the invention is not restricted to this embodiment.
  • a start-up strand head for a stick system can also be equipped in an analogous manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Continuous Casting (AREA)
  • Piles And Underground Anchors (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP80890103A 1979-10-08 1980-09-10 Anfahrstrangkopf für eine Stranggiessanlage Expired EP0028214B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT6546/79 1979-10-08
AT0654679A AT363208B (de) 1979-10-08 1979-10-08 Anfahrstrangkopf fuer eine stranggiessanlage

Publications (2)

Publication Number Publication Date
EP0028214A1 EP0028214A1 (de) 1981-05-06
EP0028214B1 true EP0028214B1 (de) 1983-11-30

Family

ID=3587396

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80890103A Expired EP0028214B1 (de) 1979-10-08 1980-09-10 Anfahrstrangkopf für eine Stranggiessanlage

Country Status (8)

Country Link
US (1) US4332289A (pt)
EP (1) EP0028214B1 (pt)
JP (1) JPS5662661A (pt)
AT (1) AT363208B (pt)
BR (1) BR8006444A (pt)
CA (1) CA1157224A (pt)
DE (1) DE3065778D1 (pt)
ES (1) ES8200027A1 (pt)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4381030A (en) * 1980-01-25 1983-04-26 Concast Ag Dummy bar head for a steel continuous casting installation containing an open-ended mold
JPS5977551U (ja) * 1982-11-15 1984-05-25 三菱重工業株式会社 連続鋳造用ダミ−バ−ヘツド
CH659016A5 (de) * 1982-12-20 1986-12-31 Concast Service Union Ag Verfahren und einrichtung zum abdichten eines anfahrkopfes in einer stranggiesskokille.
JPH0639122U (ja) * 1991-03-07 1994-05-24 安秀 玉城 自動車、オートバイのマフラーと、煙突等に公害排気ガス吸収用のフイルター付き改良装置
AT401148B (de) * 1993-03-30 1996-06-25 Voest Alpine Ind Anlagen Dichtung für einen anfahrkopf zur verwendung in einer stranggiessanlage
JP3000026B2 (ja) * 1993-12-27 2000-01-17 光洋精工株式会社 転がり軸受
KR101249818B1 (ko) * 2006-08-25 2013-04-05 파스칼 엔지니어링 가부시키가이샤 공작기계용 주축 밸런서의 부착구조
US20090050290A1 (en) * 2007-08-23 2009-02-26 Anderson Michael K Automated variable dimension mold and bottom block system

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1558324A1 (de) * 1966-05-28 1970-03-19 Uraslky Zd Tyazhelogo Mash Im Kaltstrang fuer Metallstranggussanlage
DE1558313A1 (de) * 1967-06-14 1970-07-23 Schloemann Ag Anfahrstrang fuer Stranggiessanlagen
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
US3948310A (en) * 1974-08-12 1976-04-06 Kaiser Aluminum & Chemical Corporation Bottom block for D.C. casting of aluminum rolling ingots
SU562375A1 (ru) * 1976-05-03 1977-06-25 Донецкий научно-исследовательский институт черной металлургии Затравка дл машины непрерывной разливки металлов
DE2703148C3 (de) * 1977-01-26 1980-11-06 Nautschno- Proizvodstvennoe Obedinenie Tulatschermet, Tula Anfahrstrang für eine Stranggießkokille
AT348170B (de) * 1977-03-25 1979-02-12 Voest Ag Anfahrstrang fuer stranggiessanlagen
US4149582A (en) * 1977-07-28 1979-04-17 Concast Incorporated Dummy bar head for continuous casting and method of starting a continuously cast strand

Also Published As

Publication number Publication date
ES495749A0 (es) 1981-10-01
US4332289A (en) 1982-06-01
JPS5662661A (en) 1981-05-28
ATA654679A (de) 1980-12-15
CA1157224A (en) 1983-11-22
DE3065778D1 (en) 1984-01-05
BR8006444A (pt) 1981-04-14
JPS6129820B2 (pt) 1986-07-09
EP0028214A1 (de) 1981-05-06
ES8200027A1 (es) 1981-10-01
AT363208B (de) 1981-07-27

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