Dispensing – Processes of dispensing – Molten metal
Patent
1998-02-24
1999-11-16
Kastler, Scott
Dispensing
Processes of dispensing
Molten metal
222606, 266236, 266 44, B22D 4108
Patent
active
059841532
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a device for changing a continuous casting tube, comprised of: from the distributor to a continuous casting mold having a large dimension and a small dimension, these refractory pieces being comprised of at least one fixed plate and a tube having a plate in its upper part; plate; evacuation position for a worn tube; position to the casting position and the worn tube to pass from the casting position to the evacuation position; to the casting position and the worn tube from the casting position to the evacuation position.
It is generally applied to the casting of slabs and more particularly to the casting of thin slabs.
In a steel mill continuous casting installation the steel is poured from a ladle into a distributor and from the distributor into one or more molds. To protect the steel from contact with air between the distributor and the mold, the steel is isolated from the atmosphere by means of an immersed refractory tube fixed at the bottom of the distributor and the lower end of which dips into the mold.
This tube wears and becomes clogged rapidly, more particularly in its lower section.
This limits the duration of the casting. To prolong this time, devices has been conceived that permit replacing a worn tube with a new tube. For economic reasons, it is preferable to change the tube without interrupting the casting, i-e, without raising the distributor.
In these devices, called tube-changing devices, the tube is provided with a plate in its upper part; this plate can be attached or formed of a single piece with the tube. This plate can slide, while maintaining a tight joint, on the lower face of a fixed plate of the distributor. The entire assembly of the tube and plate associated with it are simply called the tube in the following. A new tube is introduced into the ingot mold, alongside the worn tube. Means permit pushing the new tube into the casting position while the worn tube is pushed to the other side of the mold.
To permit a tube change without raising the distributor, the lower end of the new tube has to be immersed in the steel of the mold before the worn tube is pushed toward its evacuation position. In the same manner, the worn tube remains immersed in the steel when it is in the evacuation position.
An example of such a device is known from the document EP 0 192 019.
These familiar devices have several shortcomings.
It is necessary for the mold to be of sufficient width so that three tubes can be placed there side-by-side: the position of the new tube, the position of the tube that is in the process of casting, and the position that the worn tube will assume after exchange. In numerous cases, the mold does not have a sufficient width and other less favorable processes have to be used.
To make the tube change, a jack that pushes the new tube to the level of its plate, which rests on the plate of the worn tube, is generally used. It is indispensable for this effort to be transmitted via the plates of the new tube and the worn tube. In other words, it is indispensable that these plates come in contact with each other before the lower ends of the tubes touch. In fact in the contrary case, the forces exerted at the end of the tubes would cause them to jam in the sliding surfaces of tube change and rupture. For the device to function correctly, it is thus necessary that the plates have a length greater than the space required for the end of the tubes in the direction of the large dimension of the mold. This requirement is easy to meet in the case of a thick slab. In fact, the tube then has an approximately circular compact section and the plate can easily present a length greater than the outside diameter of the tube. On the other hand, in the case of a thin slab casting the mold is very narrow. In order to preserve a substantial passage section, the end of the tube should be quite prolonged in the direction of the large dimension of the mold. Consequently, the plates provided at the upper end of the tube should themselves be quite prolonged. Besides a supplementa
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Cole Thomas W.
Kastler Scott
Vesuvius France
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