Aluminium Pechiney

Cegedur Societe De Transformation De L'aluminium Pechiney

C-tec Constellium Technology Center

Christian Pluchon

Michel Garat

Willem Loue

Albert Mastrot

Jean-Mary Wattier

Jérôme Girard

Marc Tavernier

Serge Guy

Michel Brimont

Vincent Mathier

A metal alloy mass of a defined porosity for forming in the semi-solid state. When the porosity is measured by cooling in ambient air from a temperature corresponding to a liquid fraction ratio between 30 and 70% to the ambient temperature, the mass has a porosity ratio, measured by image analysis, between 2 and 20%, and preferably between 3 and 8%. Alternatively, when the gassing level is measured by a solidification test under 80 hPa, the mass has a volumetric porosity ratio between 3 and 50% and preferably between 4 and 25%.

Metal alloy mass for forming in the semisolid state

This invention relates to a method and an apparatus for lubricated forward extrusion of metals and alloys with radial forward removal of an outer shell or sheath. The method according to the invention consists of forming a gap in the form of a plane or slightly truncated cone-shaped circular outer ring having a constant thickness (j) and span (h) and open to the atmosphere between the end of the container adjacent to its bore and the assembly of extrusion tools situated opposite thereto. To facilitate the formation and especially the extraction of the outer shell, the extrusion apparatus comprises several knives situated in the above described gap, having their cutting edge directed towards the axis of the container and dividing the outer shell into as many 'petals' in the course of extrusion.

Method and apparatus for lubricated forward extrusion with radial

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Voiron, France

Christian Pluchon