EP0208642B1 - Process for extracting a product formed by continuous casting between rolls - Google Patents
Process for extracting a product formed by continuous casting between rolls Download PDFInfo
- Publication number
- EP0208642B1 EP0208642B1 EP86440043A EP86440043A EP0208642B1 EP 0208642 B1 EP0208642 B1 EP 0208642B1 EP 86440043 A EP86440043 A EP 86440043A EP 86440043 A EP86440043 A EP 86440043A EP 0208642 B1 EP0208642 B1 EP 0208642B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolls
- basin
- wings
- head
- axis
- 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
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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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- 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 generally to continuous casting between cylinders, and more particularly to the extraction of the solidified metallurgical product, at the start of casting.
- a dummy or "dummy bar” is commonly used, of section adapted to the ingot mold and provided with an anchoring head, which is placed at the outlet of the ingot mold: the cast and cooled metal solidifies on contact with the anchoring head, thus solidifying with the false bar which can then be gradually extracted, by driving the bar in formation (see for example FR-A-2334446).
- This technique is relatively easy to implement in the case of continuous casting in an ingot mold because the latter offers, in contact with the cast metal, fixed cooling walls which define a passage of constant or substantially constant section.
- the outlet section defined by the narrowest passage between the cylinders, is surrounded upstream and downstream respectively by a rather abrupt narrowing and widening of the passage , and on the other hand, the members defining this outlet section are, at least in part, mobile.
- the known solution for continuous casting ingot molds cannot simply be transposed: if, as shown in the doc. SU-A-627909 or JP 5758957, the head of the extraction manikin is placed at or upstream of the outlet section, the solidified metal on too large a volume may no longer be able to pass between the cylinders at the level of the outlet section.
- the extraction dummy is placed at or downstream of the outlet section, problems are encountered in sealing the still liquid metal between the dummy and the cylinders.
- the object of the invention is to propose a dummy suitable for continuous casting between cylinders, which does not have these drawbacks.
- the subject of the invention is a process for starting the extraction of a continuous casting product between rotary cylinders, energetically cooled by internal circulation of a cooling fluid, defining, with side closing walls, a pouring funnel, process according to which a dummy is used comprising an anchoring head provided with two flexible lateral wings which extend it parallel to the axes of the cylinders, progressively deviating from each other from their end fixed to said head, the wings defining, in combination with the side closure walls, a provisional funnel, filling said provisional funnel with liquid metal and continuing to feed it at the same time as the cylinders are rotated about their axis and that the dummy is pulled down, a process characterized in that the head is placed, which carries an anchoring piece intended to hang the solidified metal , below the plane containing the axes of the cylinders in such a way, however, that the free ends of the flexible wings come to bear on the casting cylinders above said plane, said provisional funnel being narrower than the casting funnel.
- FIGS. 1 and 2 are views respectively from the side and from above of a device for continuous casting between cylinders.
- the cylinders 1 and 2 are vigorously cooled by internal circulation of cooling water, or other fluids, and can be rotated about their horizontal axis 5, 6, in the direction of the arrows 7 and 8, by conventional motor means not shown.
- a dummy is provided, the head 9 of which carries a hooking piece 10, formed for example by a T-profile, intended to "hang” the solidified metal in order to facilitate its extraction.
- the anchoring head 9 is provided with two longitudinal wings 11 and 12 formed by a thin, flexible sheet, and curved cylindrically (according to a cylinder with a straight section not necessarily circular) and extending said head parallel to the axes of the cylinders, therefore also at their surface.
- the concavity of the wings is turned outwards.
- the base of the wings 11, 12 is fixed by welding to the edges of the head 9, parallel to the axes 5 and 6 of the cylinders, and therefore gradually move away from one another from their base.
- the manikin is placed in the initial extraction position, so that the head 9 is located below the plane 13 containing the axes 5 and 6 of the cylinders 1, 2.
- the wings 11, 12 rest elastically on the surface of the cylinders 1, 2, at a level above plane 13.
- shot 14 intended, in connection with the attachment piece 10, to ensure faster solidification of metal and better attachment between the mannequin and the solidified metal .
- we fill this temporary funnel with liquid metal and continue to feed it as well as we put the cylinders 1, 2 in rotation around their axis 5, 6 in the direction indicated by the arrows and we pull the dummy down.
- the dummy is pulled with a speed preferably substantially equal to the peripheral speed of the cylinders so that the upper end of the wings 11, 12 follows, with a minimum of sliding, the part of the surface of the cylinders with which it is in contact .
- the flexibility of the wings 11 and 12 allows them to approach and be able to cross the narrowest interval between the cylinders, at the plane 13.
- the manikin is disposed below the plane 13, its width is not limited to the narrowest interval separating the cylinders: it can therefore be slightly greater, if desired.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Moulding By Coating Moulds (AREA)
- Paper (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
L'invention concerne d'une façon générale la coulée continue entre cylindres, et d'une façon plus particulière l'extraction du produit métallurgique solidifié, au début de la coulée.The invention relates generally to continuous casting between cylinders, and more particularly to the extraction of the solidified metallurgical product, at the start of casting.
Les techniques de coulée continue entre cylindres sont bien connues, par exemple par le document US-A-3038219. Le métal liquide est versé dans un entonnoir formé par deux cylindres refroidis rotatifs tournant en sens contraire et des parois de fermeture latérale. Au contact des cylindres, le métal se solidifie et sort de l'espace entre les cylindres sous forme d'une barre continue qui est reprise, une fois le processus installé, par des rouleaux classiques d'extraction.The techniques of continuous casting between rolls are well known, for example from document US-A-3038219. The liquid metal is poured into a funnel formed by two rotary cylinders rotating in opposite directions and side closing walls. On contact with the cylinders, the metal solidifies and leaves the space between the cylinders in the form of a continuous bar which is taken up, once the process is installed, by conventional extraction rollers.
Un problème lié aux techniques de coulée continue, quelles qu'elles soient, est l'initiation du processus d'extraction. Dans les installations de coulée continue verticale en lingotière, on utilise couramment un mannequin ou "fausse-barre", de section adaptée à la lingotière et munie d'une tête d'ancrage, qu'on dispose à la sortie de la lingotière: le métal coulé et refroidi se solidifie au contact de la tête d'ancrage, se solidarisant ainsi à la fausse-barre qu'on peut alors extraire progressivement, en entraînant la barre en formation (voir par exemple FR-A-2334446).One problem with whatever casting techniques is the initiation of the extraction process. In vertical continuous casting installations in an ingot mold, a dummy or "dummy bar" is commonly used, of section adapted to the ingot mold and provided with an anchoring head, which is placed at the outlet of the ingot mold: the cast and cooled metal solidifies on contact with the anchoring head, thus solidifying with the false bar which can then be gradually extracted, by driving the bar in formation (see for example FR-A-2334446).
Cette technique est relativement facile à mettre en oeuvre dans le cas d'une coulée continue en lingotière car cette dernière offre, au contact du métal coulé, des parois fixes de refroidissement qui définissent un passage de section constante ou sensiblement constante.This technique is relatively easy to implement in the case of continuous casting in an ingot mold because the latter offers, in contact with the cast metal, fixed cooling walls which define a passage of constant or substantially constant section.
En revanche, dans le cas de la coulée continue entre cylindres, la section de sortie, définie par le passage le plus étroit entre les cylindres, est entourée en amont et en aval respectivement d'un rétrécissement et d'un élargissement assez brusque du passage, et d'autre part, les organes définissant cette section de sortie sont, au moins en partie, mobiles. Dans ces conditions, on ne peut transposer purement et simplement la solution connue pour les lingotières de coulée continue: si, comme le montre les doc. SU-A-627909 ou JP 5758957, on place la tête du mannequin d'extraction au niveau ou en amont de la section de sortie, le métal solidifié sur un volume trop large risque de ne plus pouvoir passer entre les cylindres au niveau de la section de sortie. Par contre, si on place le mannequin d'extraction au niveau ou en aval de la section de sortie, on se heurte à des problèmes d'étanchéité au métal encore liquide entre le mannequin et les cylindres.On the other hand, in the case of continuous casting between cylinders, the outlet section, defined by the narrowest passage between the cylinders, is surrounded upstream and downstream respectively by a rather abrupt narrowing and widening of the passage , and on the other hand, the members defining this outlet section are, at least in part, mobile. Under these conditions, the known solution for continuous casting ingot molds cannot simply be transposed: if, as shown in the doc. SU-A-627909 or JP 5758957, the head of the extraction manikin is placed at or upstream of the outlet section, the solidified metal on too large a volume may no longer be able to pass between the cylinders at the level of the outlet section. On the other hand, if the extraction dummy is placed at or downstream of the outlet section, problems are encountered in sealing the still liquid metal between the dummy and the cylinders.
Le but de l'invention est de proposer un mannequin adapté à la coulée continue entre cylindres, qui ne présente pas ces inconvénients.The object of the invention is to propose a dummy suitable for continuous casting between cylinders, which does not have these drawbacks.
A cet effet, l'invention a pour objet un procédé de démarrage de l'extraction d'un produit de coulée continue entre cylindres rotatifs, énergiquement refroidis par circulation interne d'un fluide refroidissant, définissant, avec des parois de fermeture latérale, un entonnoir de coulée, procédé selon lequel on utilise un mannequin comportant une tête d'ancrage pourvue de deux ailes latérales flexibles qui la prolongent parallèlement aux axes des cylindres, en s'écartant progressivement l'une de l'autre depuis leur extrémité fixée à ladite tête, les ailes définissant, en combinaison avec les parois de fermeture latérale, un entonnoir provisoire, on remplit ledit entonnoir provisoire de métal liquide et on continue à l'alimenter en même temps que l'on met les cylindres en rotation autour de leur axe et qu'on tire le mannequin vers le bas, procédé caractérisé en ce qu'on dispose la tête, qui porte une pièce d'ancrage destinée à accrocher le métal solidifié, en dessous du plan contenant les axes des cylindres de telle manière cependant que les extrémités libres des ailes souples viennent s'appuyer sur les cylindres de coulée au-dessus dudit plan, ledit entonnoir provisoire étant plus étroit que l'entonnoir de coulée.To this end, the subject of the invention is a process for starting the extraction of a continuous casting product between rotary cylinders, energetically cooled by internal circulation of a cooling fluid, defining, with side closing walls, a pouring funnel, process according to which a dummy is used comprising an anchoring head provided with two flexible lateral wings which extend it parallel to the axes of the cylinders, progressively deviating from each other from their end fixed to said head, the wings defining, in combination with the side closure walls, a provisional funnel, filling said provisional funnel with liquid metal and continuing to feed it at the same time as the cylinders are rotated about their axis and that the dummy is pulled down, a process characterized in that the head is placed, which carries an anchoring piece intended to hang the solidified metal , below the plane containing the axes of the cylinders in such a way, however, that the free ends of the flexible wings come to bear on the casting cylinders above said plane, said provisional funnel being narrower than the casting funnel.
D'autres avantages et caractéristiques de l'invention ressortiront de la description suivante, faiteen référence aux dessins annexés sur lesquels les figures 1 et 2 sont des vues respectivement de côté et de dessus d'un dispositif de coulée continue entre cylindres.Other advantages and characteristics of the invention will emerge from the following description, given with reference to the appended drawings in which FIGS. 1 and 2 are views respectively from the side and from above of a device for continuous casting between cylinders.
On y voit des cylindres 1 et 2 définissant avec des parois latérales 3 et 4 un entonnoir de coulée.It shows
Comme cela est connu en soi, les cylindres 1 et 2 sont énergiquement refroidis par circulation interne d'eau de refroidissement, ou d'autres fluides, et peuvent être entrainés en rotation autour de leur axe horizontal 5, 6, dans le sens des flèches 7 et 8, par des moyens moteurs classiques non représentés.As is known per se, the
Bien qu'on ait représenté des parois latérales 3 et 4 fixes, il faut comprendre qu'on pourrait tout aussi bien avoir des parois latérales mobiles, formées par exemple par des flasques liés à l'un ou l'autre des cylindres de coulée, comme cela est déjà connu.Although fixed
Conformément à l'invention, on prévoit un mannequin dont la tête 9 porte une pièce d'accrochage 10, formée par exemple par un profil en T, destiné à "accrocher" le métal solidifié afin de faciliter son extraction.According to the invention, a dummy is provided, the
La tête d'ancrage 9 est pourvue de deux ailes longitudinales 11 et 12 formées par une tôle mince, flexible, et incurvée cylindriquement (selon un cylindre à section droite non nécessairement circulaire) et prolongeant ladite tête parallèlement aux axes des cylindres, donc aussi à leur surface. La concavité des ailes est tournée vers l'extérieur. La base des ailes 11, 12 est fixée par soudure sur les bords de la tête 9, parallèlement aux axes 5 et 6 des cylindres, et s'écartent donc progressivement l'une de l'autre depuis leur base.The anchoring
Le mannequin est placé en position initiale d'extraction, de manière que la tête 9 soit située en dessous du plan 13 contenant les axes 5 et 6 des cylindres 1, 2. Les ailes 11, 12 s'appuient élastiquement sur la surface des cylindres 1, 2, à un niveau situé au-dessus du plan 13.The manikin is placed in the initial extraction position, so that the
Les ailes 11, 12, en combinaison avec les parois 3, 4, forment un entonnoir provisoire, fermé au fond par la face frontale de la tête 9.The
Pour commencer la coulée, on dispose dans le fond de l'entonnoir provisoire, des grenailles 14 destinées, en liaison avec la pièce d'accrochage 10, à assurer une solidification plus rapide de métal et une meilleure solidarisation entre le mannequin et le métal solidifié. Puis on remplit cet entonnoir provisoire de métal liquide et on continue à l'alimenter ainsi en même temps que l'on met les cylindres 1, 2 en rotation autour de leur axe 5, 6 dans le sens indiqué par les flèches et qu'on tire le mannequin vers le bas. Le mannequin est tiré avec une vitesse de préférence sensiblement égale à la vitesse périphérique des cylindres de manière que l'extrémité supérieure des ailes 11, 12 suive, avec un minimum de glissement, la partie de la surface des cylindres avec laquelle elle est en contact.To start casting, there are at the bottom of the temporary funnel, shot 14 intended, in connection with the
Du fait que les ailes 11, 12 s'appuient élastiquement contre les cylindres 1, 2, elles assurent l'étanchéité minimale nécessaire à l'égard du métal liquide.Because the
Lors de l'extraction progressive du mannequin dans le sens de la flèche 15, la flexibilité des ailes 11 et 12 leur permet de se rapprocher et de pouvoir franchir l'intervalle le plus étroit entre les cylindres, au niveau du plan 13.During the gradual extraction of the dummy in the direction of
Du fait que le mannequin est disposé en dessous du plan 13, sa largeur n'est pas limitée à l'intervalle le plus étroit séparant les cylindres: elle peut donc lui être légèrement supérieure, si on le souhaite.Because the manikin is disposed below the
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT86440043T ATE51781T1 (en) | 1985-06-07 | 1986-06-02 | PROCESS FOR EXTRACTING AN OBJECT CAST IN A CONTINUOUS CASTER BETWEEN CASTING ROLLERS. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8508685A FR2582971B1 (en) | 1985-06-07 | 1985-06-07 | PROCESS AND MANNEQUIN FOR EXTRACTING A CONTINUOUS CASTING PRODUCT BETWEEN CYLINDERS |
| FR8508685 | 1985-06-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0208642A1 EP0208642A1 (en) | 1987-01-14 |
| EP0208642B1 true EP0208642B1 (en) | 1990-04-11 |
Family
ID=9320014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86440043A Expired - Lifetime EP0208642B1 (en) | 1985-06-07 | 1986-06-02 | Process for extracting a product formed by continuous casting between rolls |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0208642B1 (en) |
| JP (1) | JPS6250053A (en) |
| AT (1) | ATE51781T1 (en) |
| DE (1) | DE3670227D1 (en) |
| ES (1) | ES8705268A1 (en) |
| FR (1) | FR2582971B1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2610227B1 (en) * | 1987-02-04 | 1990-04-20 | Siderurgie Fse Inst Rech | SYSTEM FOR HOLDING THE ANCHORING HEAD OF AN EXTRACTION MANNEQUIN IN A CONTINUOUS CASTING INSTALLATION BETWEEN CYLINDERS |
| DE3834410A1 (en) * | 1988-10-10 | 1990-04-12 | Schloemann Siemag Ag | START-UP DEVICE FOR A STEEL TAPE CASTING SYSTEM |
| AT411822B (en) | 2002-09-12 | 2004-06-25 | Voest Alpine Ind Anlagen | METHOD AND DEVICE FOR STARTING A CASTING PROCESS |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE7612774L (en) * | 1975-12-12 | 1977-06-13 | Voest Ag | STARTING STRAND HEAD FOR STRAND MOLDING SYSTEMS |
| SU627909A1 (en) * | 1977-03-15 | 1978-10-15 | Уральский завод тяжелого машиностроения им. С.Орджоникидзе | Metal continuous casting machine seed |
-
1985
- 1985-06-07 FR FR8508685A patent/FR2582971B1/en not_active Expired
-
1986
- 1986-06-02 EP EP86440043A patent/EP0208642B1/en not_active Expired - Lifetime
- 1986-06-02 AT AT86440043T patent/ATE51781T1/en not_active IP Right Cessation
- 1986-06-02 DE DE8686440043T patent/DE3670227D1/en not_active Expired - Lifetime
- 1986-06-06 ES ES555791A patent/ES8705268A1/en not_active Expired
- 1986-06-06 JP JP61131686A patent/JPS6250053A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| ATE51781T1 (en) | 1990-04-15 |
| DE3670227D1 (en) | 1990-05-17 |
| EP0208642A1 (en) | 1987-01-14 |
| ES8705268A1 (en) | 1987-05-01 |
| JPS6250053A (en) | 1987-03-04 |
| FR2582971B1 (en) | 1987-09-25 |
| FR2582971A1 (en) | 1986-12-12 |
| ES555791A0 (en) | 1987-05-01 |
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