Method for the controlled pre-rolling of thin slabs leaving...

B - Operations – Transporting – 21 – H

Patent

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Details

B21H 9/00 (2006.01) B22D 11/06 (2006.01) B22D 11/12 (2006.01) B22D 11/16 (2006.01)

Patent

CA 2119987

Method for the controlled pre-rolling of thin slabs (20) leaving a continuous casting plant, whereby the pre-rolling is carried out with a plurality of pairs of rolls (14-16) grouped together in one or more pre-rolling assemblies (10), the first of the pre-rolling assemblies (10) being positioned immediately downstream of foot rolls (12) of a mold (11), at least one displaceable roll (16) being included in the pairs of rolls (14-16), the pairs of rolls (14-16) being associated with pressure transducer means (18) and hydraulic capsule means (17), position transducer means (24) being included, the pressure transducer means (18) and position transducer means (24) can be associated with a data processing unit (21), at least the first of the pairs of rolls (14-16) processing a slab (20) which has just emerged from the mold (11) with a thin solidified skin. The method achieves a pre-rolling with a reduction of the thickness of the slab (20) leaving the last pair of pre-rolling rolls (14-16) by at least 10% so as to eliminate the liquid core and to bring into contact the zones in a two-phase condition in order that the central solidification structure be refined and the central separation be minimized. Device suitable to carry out the controlled pre-rolling of thin slabs according to the above method, which comprises means (25a) to monitor the temperature of the liquid bath in a tundish, means (25b) to monitor the temperature of a slab (20), means (26) to monitor the speed of the slab (20) and means (28) to monitor the inclusion of a liquid cone.

L'invention concerne un procédé pour le prélaminage contrôlé de brames, en particulier de brames minces, quittant une unité de coulée continue, dans lequel le prélaminage est exécuté avec des paires de cylindres (14-16) de prélaminage assemblées pour former au moins un ensemble (10) de prélaminage; le premier de ces ensembles (10) de prélaminage étant positionné immédiatement en aval des cylindres de pied (12) d'un cristallisoir (11), au moins un cylindre mobile (16) faisant partie des paires de cylindres (14-16) associées avec au moins un capteur de pression (18), un vérin hydraulique (17) et un capteur de position (24), le capteur de pression (18) et le capteur de position (24) pouvant être associés à une unité de traitement des données (21), au moins la première des paires de cylindres (14-16) assurant le traitement de la brame (20) tout juste sorti du cristallisoir (11) avec une peau solidifiée mince. Le procédé réalise un prélaminage donnant une réduction d'épaisseur d'au moins 10 % de la brame (20) à la sortie de la dernière paire de cylindres de prélaminage (14-16) de manière à éliminer le noyau liquide et mettre en contact les zones présentant deux phases pour entraîner l'affinage de la structure centrale de solidification et minimiser la séparation de cette zone. L'invention concerne une installation adapté au prélaminage contrôlé de brames minces selon le procédé ci-dessus qui fait appel à un moyen (25a) pour surveiller la température dans la lingotière, un moyen (25b) pour surveiller la température de la brame (20), un moyen (26) pour surveiller la vitesse de la brame (20) et un moyen (28) pour surveiller les inclusions de cône liquide.

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