Metal founding – Means to shape metallic material – Continuous or semicontinuous casting
Patent
1993-03-17
1995-08-29
Batten, Jr., J. Reed
Metal founding
Means to shape metallic material
Continuous or semicontinuous casting
164480, B22D 1106
Patent
active
054452112
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to rolls used in strip continuous casting machines.
More particularly, the invention relates to rolls used to minimize the problems of liquid metal confinement due to wear caused by mutual contact between the surfaces of the rolls and the corresponding lateral confinement plates.
Prior art
In the field of continuous casting, it is of particular interest to cast the molten metal directly as thin strip, thus permitting the total or partial elimination of hot rolling steps.
In this field, for the steel the development of the technology comprising the use of casting machines with counter-rotating rolls is particularly promising.
Such machines cast molten metal in an ingot mold formed by two counter-rotating rolls with parallel rotating axes laying on a same horizontal plane, and by two lateral plates in contact with the terminal flat bases of said rolls.
The counter-rotating rolls are usually made of steel. Their surface is cooled by pressure circulating water. The rolls are kept close to each other divided by a constant gap which allows strips to be obtained of a desired thickness. Usually, one of the rolls is movable, to change the gap existing between the rolls. This movement being actuated by hydraulic pistons.
The plates are substantially formed of refractory material, in contact with the flat bases of the rolls and with the molten metal and are supported by a metallic frame.
Special pushers, (e.g., spring means) push the plates against said flat bases to ensure the necessary sealing and to hold the liquid metal.
Said sealing means is subject to particularly heavy working conditions. In fact, besides always present high thermal loads, there is a continuous friction between the plates and the flat bases of the rolls that causes wear of the contact surfaces, with following infiltrations of metal between said surfaces.
The infiltrated metal has a strong and negative influence on the surface quality of the product edges and on the casting yield, and can often stop the rotation of the rolls.
A number of attempts were made to improve the lateral confinement. However, up to now, no satisfactory improvement has been obtained in the quality of products and in the plant productivity.
For instance, it has been tried to increase the contact pressure between plates and rolls to improve their contact.
Thus, monolithic plates have been produced of wear resistant refractory materials, such as alumina or silica. Additionally, some stellite platelets have been laid on the rolls, in correspondence to the contact zones with the plates.
However, such suggestions do not satisfactorily solve the described drawbacks.
SUMMARY OF THE INVENTION
It has now been found that an improvement in the sealing between lateral plates and rolls can be obtained by laying a number of flanges on the rolls, in correspondence to the contact-area. The flanges are resistant to wear and to thermal cycling.
The purpose of the present invention is, therefore, the production of a poll bearing an annular reinforcing element as a flange made of a wear and thermal cycling resisting material. The annular reinforcing element is positioned in the contact zone with the plates.
Another purpose of the present invention is the realization of a strip continuous casting machine comprising polls bearing an annular reinforcing element as a flange made of a wear and thermal cycling resisting material. Again, the annular reinforcing element is positioned in the contact zone with the plates.
Further purposes of present invention shall be evident from the following description of the invention.
DETAILED DESCRIPTION OF THE INVENTION
The roll, according to the present invention, is formed by an outer cylindrical surface and by two flat bases perpendicular to the potation axis of the poll. The roll is characterized by the fact that on each of the bases, in correspondence to the edge between them and the cylindrical surface, an annular reinforcing element is placed, made up by at least one flange realized in a materia
Capotosti Romeo
Tolve Pietro
Tonelli Riccardo
Batten, Jr. J. Reed
Centro Sviluppo Materiali S.p.A.
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