Aluminium Pechiney

Cegedur Societe De Transformation De L'aluminium Pechiney

Societe De Vente De L'aluminum Pechiney

Charles Vives

Jean-Pierre Riquet

Bernard Forest

In a continuous vertical casting operation carried out in a mould 3, a coil 7 applies a periodic magnetic field of variable strength whose direction is substantially parallel to the axis of the mould 3 to the liquid 5 as it solidifies, in order to regulate the level of the line of contact of the free surface of the metal 5 with the mould 3. The height of the contact of the metal with the mould can be reduced from h.sub.1 to h.sub.2 by applying the magnetic field, and the strength of the field is adjusted in dependence on the desired level. The procedure is used in casting semifinished metallurgical products, in particular in aluminium and its alloys, in which there is a wish to obtain a cortical region of zero thickness, a fine grain without the preliminary addition of refining agents, and an absence of pitting.

Process for regulating the level of the line of contact of the free

The invention relates to an apparatus for regulating the level of the line of contact of the free surface of the metal with the mould in vertical casting. It comprises a mould formed by a material having a level of resistivity of higher than 5 .mu..omega..cm, surrounded by an annular coil in which at least one alternating electrical current flows. It finds application in the casting of metallurgical semi-manufactured products, in particular of aluminium and alloys thereof, such as for example lithium-bearing alloys, and in which there is a wish to have both a cortical zone of virtually zero thickness, a fine grain without the previous addition of refining agents, and an absence of pitting.

Apparatus for regulating the level of the line of contact of the free

The present invention relates to a process for the electromagnetic casting of metals. The process is characterized by simultaneously using a stationary field and a variable field at a suitable frequency for producing both radial vibrations within the metal which is not yet in a solidified condition and limiting agitation of the metal. The invention can be used in any circumstance where both the structure and the surface condition of the cast products are to be improved.

Process for the electromagnetic casting of metals involving the use of

A process for casting metals comprising simultaneously applying a stationary magnetic field and a variable magnetic field to the molten metal in the course of solidification. The magnetic fields act in the same direction and generate radial vibrations in the metal, causing the cast metal to have an improved homogeneous structure and surface condition.

Process for casting metals in which magnetic fields are employed

The device includes a chamber for holding a metal in the liquid state having a lower section that communicates with three channels which converge to form a single passage wherein two of the channels include inductor cores around which the channel forms an annular zone to contain the metal. In the presence of alternating currents of variable voltage and phase, the inductors can be energized separately or simultaneously to perform the heating, mixing and transferring operations within the channels.

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Chateaurenard, France

Charles Vives