B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
B22D 11/10 (2006.01) B22D 11/115 (2006.01)
Patent
CA 2279909
The present invention provides a continuous casting method in which vibration is given to molten metal by a shifting magnetic field so that the equi-axed crystal ratio can be enhanced and the equi-axed crystals can be made fine without generating surface defects caused by powder trapping. Further, the present invention provides an apparatus to which the continuous casting method is applied. Furthermore, the present invention provides a cast slab produced by the above method and apparatus. The method of casting molten metal comprises the steps of: pouring molten metal into a mold and solidifying it in the mold while applying an electromagnetic force, which is generated by an electromagnetic coil arranged in the proximity of a molten metal pool in the mold, upon the molten metal; and vibrating the molten metal, which has been solidified in the mold or is being drawn out downward from the mold while being cooled and solidified, by a shifting magnetic field generated by the electromagnetic coil so that the molten metal is accelerated by a high intensity and a low intensity of acceleration in a range not exceeding a predetermined flow velocity when the directional vectors of high acceleration and low acceleration in the same direction or in the opposite direction are combined with each other.
L'invention porte sur un procédé et un appareil de moulage en continu d'un métal en fusion appliquant au métal des vibrations produites par un champ magnétique variable améliorant le rapport des cristaux équiaxes et pouvant en outre raffiner ces cristaux sans causer de discontinuités de surface dues à des inclusions pulvérulentes. L'invention porte également sur des pièces moulées obtenues par ledit procédé de fabrication consistant à injecter le métal en fusion dans le moule en lui appliquant une force due à une bobine électromagnétique placée à proximité du moule alors qu'il progresse vers l'aval entièrement solidifié, ou solidifié par refroidissement dans le moule à un degré compris dans une plage ne dépassant pas une valeur prédéterminée de vitesse du flux, en soumettant le métal à des accélérations rapides et lentes, et en combinant les vecteurs directionnels desdites accélérations ou en les opposant pour faire vibrer le métal en fusion.
Fujisaki Keisuke
Harada Hiroshi
Hasegawa Hajime
Sasai Katsuhiro
Takeuchi Eiichi
Goudreau Gage Dubuc
Nippon Steel Corporation
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