EP0069867B1 - Vorrichtung zum Unterstützen und Zentrieren eines Kernes in einer Kokille beim Stranggiessen von Röhren - Google Patents

Vorrichtung zum Unterstützen und Zentrieren eines Kernes in einer Kokille beim Stranggiessen von Röhren Download PDF

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Publication number
EP0069867B1
EP0069867B1 EP82105179A EP82105179A EP0069867B1 EP 0069867 B1 EP0069867 B1 EP 0069867B1 EP 82105179 A EP82105179 A EP 82105179A EP 82105179 A EP82105179 A EP 82105179A EP 0069867 B1 EP0069867 B1 EP 0069867B1
Authority
EP
European Patent Office
Prior art keywords
core
casting
projections
head
centering
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
EP82105179A
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English (en)
French (fr)
Other versions
EP0069867A1 (de
Inventor
Yves Gourmel
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.)
Pont a Mousson SA
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Pont a Mousson SA
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Filing date
Publication date
Application filed by Pont a Mousson SA filed Critical Pont a Mousson SA
Priority to AT82105179T priority Critical patent/ATE7209T1/de
Publication of EP0069867A1 publication Critical patent/EP0069867A1/de
Application granted granted Critical
Publication of EP0069867B1 publication Critical patent/EP0069867B1/de
Expired legal-status Critical Current

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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
    • B22D11/006—Continuous casting of metals, i.e. casting in indefinite lengths of tubes

Definitions

  • the present invention relates to the vertical continuous casting of tubes of metals or metal alloys and applies more particularly to the continuous casting of thin cast iron tubes, to the continuous casting of thin cast iron tubes, to the using a die comprising a mold and a mandrel, or cylindrical core, coaxial with the mold, which delimit an annular space for the casting of the tube.
  • the invention relates to the centering of the core, or mandrel, in the die.
  • the problem of centering the core with respect to the die is particularly acute when it is desired to pour thin tubes, that is to say of low thickness / diameter ratio, the thickness of which does not exceed a few millimeters and in particular, as in the case of the present invention, tubes with a thickness / outside diameter ratio of less than 8% and of a thickness of less than 5 mm.
  • the slightest eccentricity of the core relative to the mold causes a significant irregularity in the thickness of the tube, around the entire periphery of the die.
  • an offset of 0.5 mm leads to a significant relative irregularity which can reach from 1 to mm, that is to say 33%.
  • such an offset can easily come, for example, from machining tolerances and / or from a slightly heterogeneous expansion of the core during heating.
  • a precise, difficult and costly adjustment is also used if, as known, a core with centering range in the mold or the shell is used.
  • the present invention therefore aims to allow precise centering of the core relative to the die, from a material whose manufacturing tolerances are usually much greater than those required for this centering or alignment, c '' ie from assemblies with large clearances.
  • the subject of this invention is in fact a device for supporting and centering a cylindrical core inside the annular die of a vertical continuous casting installation for a thin tube, comprising a casting head or box, which connects a ladle to the narrow annular space of the annular die, characterized in that it comprises in combination, for the support of the core, a ball joint between the upper end of the core and the upper part of the head of casting, the core passing through this casting head with a large clearance, and, for centering the core in the mold inside the annular space of the annular die, a series of identical projections or bosses, regularly spaced on the periphery of the core and in contact with the internal wall of the mold, at the upper part or inlet of the annular die, at a level of immersion in the liquid metal during casting.
  • the core is perfectly centered relative to the mold and, therefore, perfectly aligned with the extractor as soon as the mold is itself aligned with the latter.
  • the upper end of the core is integral with a support cap with a spherical lower surface, which is supported on an annular seat with a spherical upper surface fixed above the casting head, or coaxially at the exit of the head.
  • the bosses can have various shapes ensuring specific contacts, or on very small surfaces, with the wall of the mold. In all cases, they occupy a small volume compared to that of the annular space and are close enough to the inlet of the die to only be surrounded by liquid metal.
  • the pouring ladle is extended by a pouring nozzle 10, on which is fixed in a leaktight but removable manner a pouring head or box 12, of the channel type or angled conduit, that is to say comprising a channel 14 in the extension of the pouring nozzle 10 and a pouring basin 16, of axis XX, perpendicular to the channel 14.
  • a die 18 opens into the basin 16 and must be coaxial both with this casting basin and with a device extractor 20, also of axis XX, which is fixed under the chassis.
  • the annular die 18 comprises a mold 22 of axis XX and a mandrel, or cylindrical core, 24 which defines with this mold a narrow annular space, 26, for casting the tube (fig. 2), and must therefore also be centered. on the XX axis.
  • the mold 22 is constituted by a graphite cylinder which comprises, at its upper part, a frustoconical head or "spout" 23, immersed in the pouring basin 16, and is surrounded by an envelope 30 delimiting a liner of liquid metal of low melting point cooling, connected by conduits 31 and 32 respectively to a pressure supply and to a drain.
  • an envelope 30 delimiting a liner of liquid metal of low melting point cooling, connected by conduits 31 and 32 respectively to a pressure supply and to a drain.
  • an envelope of circulating cooling water 34 is disposed around the envelope 30.
  • the assembly of the mold 22 and the cooling envelopes is held by two flanges 27 and 28, respectively upper and lower, which are fixed under the head. casting 12 by means of tie rods 29.
  • the core 24 is preferably constituted by a hollow cylinder, inside of which is mounted a heating coil 36, which occupies almost the entire internal cavity of the core but, preferably, does not extend to the 'lower end of the latter. At its upper end the core 24 has a flared, frustoconical head 38. As clearly shown in FIG. 2, the length of the core 24 is much greater than the sum of the lengths of the mold 22 and of the casting head 12, and this core passes with clearance through an orifice 40 in the upper part of this casting head, so that the head 38 protrudes outside the latter.
  • the head 38 is supported above the casting head 12 by a cap 42 threaded on the core 24, with the interposition of a sheath 44 having a cylindrical part and a frustoconical part 45 which adapts to the shape of the head flared 38.
  • the upper surface 43 of the cap 42 is planar, but its lower surface 46 is spherical and rests on the upper surface 48, of corresponding shape, of a seat 50 fixed, for example by screws 52, on the head casting 12.
  • the seat 50 is annular and is coaxial with the orifice 40 for passage of the core 24.
  • the cap 42 is strictly integral with the core 24 and the head 38, because it is fixed by means of bolts 56, or similar, on a flange 58 which surrounds the head 38 and is supported on the end of the sheath 44 , and which is further suspended by means of bolts 62, or other similar members, from an upper flange 60 tightly applied against the upper face of the head 38.
  • the device for supporting or suspending the core 24 is therefore essentially constituted by the head 38, the sleeve 44 and the seat 50 fixed on the casting head 12.
  • a combination of spherical surfaces 46 and 48 is considered to be a ball joint.
  • the core 24 further comprises, at an intermediate point, a series of projections or bosses 70, regularly distributed over its periphery.
  • the projections or pads 70 are made of graphite. They come from molding with the core 24 or can be attached to the core 24. These projections 70, intended to come into contact with the internal surface of the mold 22, are located on a part of the core 24 placed at the top of the annular die 18, at the level of the frustoconical spout 23, therefore at the entrance of the annular die 18, to be in an area where the cast iron poured into the annular space 26 is still liquid.
  • the height or radial projection of each of the pellets 70 relative to the wall of the core 24 corresponds to the width of the annular space 26 which delimits the die.
  • the top of the pellets 70 intended to be in contact with the internal wall of the mold 22 is not planar, but is preferably curved, each pellet preferably comprising a lateral draft 71 all around its top.
  • the patch 70 may have a square base, as shown in FIGS. 3 and 5, or a circular base as shown at 72 in fig. 6.
  • the core 24 comprises pellets 74 which have a square base, delimited by four oblique sides 75, so that the crown 76 which comes into contact with the internal surface of the mold 22 has an extremely reduced and almost punctual surface.
  • centering protrusions or pads 70, 72, 74 carried by the core 24 are placed so as to be as close as possible to the entrance to the mold 22, that is to say from the entrance to the annular die 18, at the level of frustoconical spout 23 which is immersed in the casting basin 16, so as to be in contact only with liquid metal.
  • pellets 70, 72, 74, as well as the distance which separates them from the periphery of the core 24, are chosen so that the total volume of the pellets is small compared to that of the annular space 26, therefore of so as to oppose only a negligible obstacle to the flow of liquid iron. Consequently, the flow of the liquid is practically not modified by their presence and the pouring takes place in exactly the same way as in the absence of these pellets.
  • this mold 22 may have significant clearances relative to the head casting, due to manufacturing tolerances on the one hand, and the work of the outer sheet 13 of this head under the action of heat, on the other hand. It is therefore necessary to center the core 24 relative to the mold 22 and, consequently, to the extractor 20, and not relative to the casting head 12.
  • the sheath 44 and the cap 42 are first fixed on the core 24 and its head 38, by means of the flanges 58 and 60. Then the core 24 is introduced into the orifice 40 of the casting head and makes it descend and penetrate into the mold 22, until the centering pads meet the internal wall of this mold and regulate the position of the core. The cap 42 then comes to press on the upper surface 48 of the seat 50 and, whatever the position of the core 24 relative to the orifice 40 and to the casting head, these two surfaces closely fit one in the other. The immobilization of the core 24 is then ensured by the lugs 64 held by the studs 66 and the nuts 68.
  • These pastilles are for example six in number, but leave a large cross section between them. Consequently, no risk of solidification, or rather of deposit followed by solidification, is to be feared in this centering zone.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Continuous Casting (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Claims (10)

1. Vorrichtung zum Unterstützen und Zentrieren eines zylindrischen Kernes (24) im Inneren der ringförmigen Düse (18) einer Anlage zum Vertikalstrangguß eines dünnen Rohres (T), mit einem Gießkopf oder -kasten (12), der ein Gießbecken (16) mit dem engen Ringraum (26) der ringförmigen Düse (18) verbindet, dadurch gekennzeichnet, daß sie in Kombination zum Unterstützen des Kernes (24) ein Gelenklager (42, 44, 46, 48, 50) zwischen dem oberen Ende (38) des Kernes (24) und dem oberen Teil des Gießkopfes (12), den der Kern (24) mit einem erheblichen Spiel durchsetzt, und zum Zentrieren des Kernes (24) in der Form (22) im Inneren des Ringraumes (26) der Düse (28) eine Anzahl von gleichen, regelmäßig am Umfang des Kernes verteilten Vorsprüngen oder Höckern (70; 72; 74) im Kontakt mit der Innenwand der Form (22) im oberen Teil oder Eingang der ringförmigen Düse (18) auf einer Eintauchhöhe in der Metallschmelze beim Gießen aufweist.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das obere Ende (38) des Kernes (24) mit einer Stützkalotte (42) mit kugelförmiger Unterseite (46) starr verbunden ist, die auf einem ringförmigen Lagerbock (50) mit kugelförmiger Oberseite (48) aufliegt, der über dem Gießkopf (12) koaxial zur ringförmigen Düse (18) befestigt ist.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das obere Ende des Kernes (24) ein konisch erweiterter Kopf (38) ist und daß die Stützkalotte (42) unter diesem Kopf (38) angepreßt ist.
4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sich die Höcker oder Vorsprünge (70; 72; 74) zum Zentrieren des Kernes (24) bezüglich der Form (22) am Umfang des Kernes (24) in Anlage an der Innenwand der Form (22) im oberen Teil derselben an der Stelle einer kegelstumpfförmigen Tülle (23) befinden, die in das Gießbecken (16) des Gießkopfes (12) eingetaucht ist.
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Vorsprünge oder Höcker aus Zentrierplättchen (70; 72; 74) mit einem Gipfel (76) bestehen, der eine Oberfläche fast punktförmigen Kontakts mit der Innenwand der Form (22) hat.
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Gipfel (76) der Vorsprünge (70; 72; 74) gewölbt ist.
7. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß die Zentriervorsprünge (70; 72; 74) eine Anschlußschräge (71; 75) zur Umfangsfläche des Kernes (24) aufweisen.
8. Vorrichtung nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß die Vorsprünge oder Höcker (74) eine Kontaktoberfläche mit der Innenwand der Form (22) haben, die durch vier schräge Felder (75) begrenzt ist.
9. Vorrichtung nach einem der Ansprüche 1, 4, 5, 7 und 8, dadurch gekennzeichnet, daß die Vorsprünge oder Höcker (70; 74) eine quadratische Basis haben.
10. Vorrichtung nach einem der Ansprüche 1, 4, 5 und 7, dadurch gekennzeichnet, daß die Vorsprünge oder Höcker (72) eine kreisförmige Basis haben.
EP82105179A 1981-07-06 1982-06-14 Vorrichtung zum Unterstützen und Zentrieren eines Kernes in einer Kokille beim Stranggiessen von Röhren Expired EP0069867B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82105179T ATE7209T1 (de) 1981-07-06 1982-06-14 Vorrichtung zum unterstuetzen und zentrieren eines kernes in einer kokille beim stranggiessen von roehren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8113239A FR2508828A1 (fr) 1981-07-06 1981-07-06 Dispositif de support et de centrage d'un noyau dans une filiere de coulee continue d'un tube
FR8113239 1981-07-06

Publications (2)

Publication Number Publication Date
EP0069867A1 EP0069867A1 (de) 1983-01-19
EP0069867B1 true EP0069867B1 (de) 1984-04-25

Family

ID=9260246

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82105179A Expired EP0069867B1 (de) 1981-07-06 1982-06-14 Vorrichtung zum Unterstützen und Zentrieren eines Kernes in einer Kokille beim Stranggiessen von Röhren

Country Status (9)

Country Link
US (1) US4456053A (de)
EP (1) EP0069867B1 (de)
JP (1) JPS6036852B2 (de)
AT (1) ATE7209T1 (de)
BR (1) BR8203905A (de)
CA (1) CA1180878A (de)
DE (1) DE3260120D1 (de)
ES (1) ES266051Y (de)
FR (1) FR2508828A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2573683B1 (fr) * 1984-11-26 1987-01-02 Pont A Mousson Installation d'alimentation en metal liquide avec controle de temperature du metal liquide pour la coulee continue d'un tuyau en fonte
TW312700B (de) * 1994-05-17 1997-08-11 Sony Co Ltd
FR2751249B1 (fr) * 1996-07-17 1998-09-04 Pont A Mousson Dispositif de positionnement d'un bloc-filiere d'une table de coulee d'une machine de coulee continue verticale ascendante

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US560484A (en) * 1896-05-19 dupont
US2502312A (en) * 1945-07-19 1950-03-28 Danner Edward Tubular glass manufacturing apparatus
FR1446694A (fr) * 1964-09-10 1966-07-22 Kennecott Copper Corp Dispositif pour la coulée continue de billettes métalliques
FR1485055A (fr) * 1965-07-01 1967-06-16 Phelps Dodge Copper Prod Procédé et appareil perfectionnés pour la coulée en continu de tubes métalliques
SU502703A1 (ru) * 1972-10-02 1976-02-15 Уральский научно-исследовательский институт черных металлов Формообразователь

Also Published As

Publication number Publication date
US4456053A (en) 1984-06-26
JPS6036852B2 (ja) 1985-08-22
CA1180878A (fr) 1985-01-15
EP0069867A1 (de) 1983-01-19
FR2508828A1 (fr) 1983-01-07
JPS5816757A (ja) 1983-01-31
BR8203905A (pt) 1983-06-28
FR2508828B1 (de) 1983-10-21
DE3260120D1 (en) 1984-05-30
ES266051Y (es) 1983-07-16
ATE7209T1 (de) 1984-05-15
ES266051U (es) 1983-01-16

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