Institut De Recherches De La Siderurgie Francaise (irsid)

Institut De Recherches De La Siderurgie Francaise

Institut Des Recherches De La Siderurgie Francaise

Robert Alberny

Jean-Pierre Birat

Louis Vedda

Roger Ventavoli

Alain Leclercq

Jean Pierre Birat

Bernard Trentini

A method of continuous centrifugal casting of metal products in which molten metal is rotated during the passage through an elongated cooled ingot mold about the axis of the latter and in which the still liquid core of the partly solidified casting as it leaves the ingot mold is subjected to forces counteracting the rotation of the still liquid core of the casting.

Method and apparatus for continuous centrifugal casting of metal products

A metallic product free of surface faults is continuously cast in a cooled, conductive ingot mold wherein a liquid metal is rotated by applying a magnetic field turning about the axis of the mold thereto and wherefrom the partially solidified metal product is extracted continuously. The driving action of the magnetic field is optimized by imparting to it a maximum value of frequency of rotation between 4 and 15 Hertz, this value being a function of the form and size of the cast product as well as the thickness and electric conductivity of the mold wall such that any increase in the frequency of rotation above this value brings about an attenuation of the frequency in the mold wall in excess of its positive effect on the rotation of the liquid metal.

Continuous casting of a metallic product by electromagnetic centrifuging

A metallic product is cast continuously by injecting a liquid metal into a cooled ingot mold, applying a magnetic field turning about the axis of the mold to rotate the metal, and extracting the partially solidified metal product from the mold. Effective stirring is obtained by rotating the magnetic field at a frequency of rotation of 4 to 15 Hertz and using a copper alloy of structural rigidity for the mold, the wall thickness of the mold being kept thin, preferably below 15 mm. The process is particularly useful for casting round metallic products and especially those which are subjected to after-treatments requiring good surface characteristics and a core free of faults.

A continuous-casting mold has two long sides each of which is provided with a cooling box through which water is passed in order to cool the copper-alloy sides of the mold. Provided inside this cooling box is a plurality of inductors each wound around a magnetic element that extends between the box on one side and the wall of the mold on the other side so that these magnetic elements can act both as inductor cores and as support struts between these two facing walls. The magnetic elements may be formed as horizontal plates about which are wound elongated coils, or may be cylindrical pins on which cylindrical coils are wound.

Continuous-casting mold with electromagnet

A continuous-casting mold has two relatively long sides and two relatively short sides. Secured to each of the long sides is a box through which coolant is circulated, and in each of these boxes there is provided a plurality of horizontally spaced groups of vertically spaced inductors. Each of these groups is connected to a respective multiphase power supply so that the frequency and/or field strength of the respective magnetic field can be varied from group to group in order to eliminate dead zones within a body of metal being cast within the mold.

Continuous-casting system with electro-magnetic mixing

A mold for continuously casting of billets comprises an inner copper mold and an outer steel envelope surrounding the mold. The outer envelope is affixed to the inner mold by threaded tie rods which are anchored to parallel longitudinally extending ribs on the exterior faces of the inner mold. These ribs define grooves therebetween and the interior faces of the envelope have parallel longitudinally extending ribs facing the grooves. The facing ribs and grooves define therebetween longitudinal channels for a cooling liquid for the mold.

Thin-walled mold for the continuous casting of molten metal

A method of continuously casting metal in which the metal is subjected during its solidification at a predetermined zone to the action of a magnetic field which is controlled as a function of the withdrawal speed of the metal during the continuous casting thereof to maintain in the region of the solidification of the metal a magnetic pressure between two predetermined limits to thereby agitate the metal during its solidification to improve the structure of the cast product especially in a central axial zone of the product.

Growing community of inventors

Metz, France

Robert Alberny