Constellium Extrusion Decin S.r.o.

Constellium Issoire

Constellium Neuf-brisach

Constellium Rolled Products Singen Gmbh & Co.kg

Jean-sylvestre Safrany

Frank Eberl

Ivo Kolarik

Lukasz Dolega

Bernard Grindatto

Lionel Peguet

Maria Belen Davo Gutierrez

David Faihy

Matthieu Boehm

Thibaud Bret

The invention relates to extruded products suitable for turning, made from aluminium alloy with a composition (in weight %) of: 0.4-0.8 Si; 0.8-1.2 Mg; 0.20-0.4 Cu; 0.05-0.4 Fe; Mn&#x2264;0.10; Ti&#x3c;0.15; Cr&#x2264;0.10; Bi&#x2264;0.8; Pb&#x2264;0.4; other elements &#x3c;0.05 each and &#x3c;0.15 remainder being aluminium, characterised in that the granular structure thereof is essentially recrystallized. The invention also relates to the method for the production of said products. The invention further relates to anodised turned mechanical parts obtained from extruded products according to the invention and to the production method thereof. The products of the invention are particularly suitable for the production of brake pistons and gearbox elements.

Extruded 6XXX alloy product that is suitable for turning and has low roughness after anodisation

The invention relates to a method for the production of a mechanical part, comprising the following successive steps: casting of a billet of aluminum alloy with a composition (in weight %) of 0.4-3.0 Si; 0.6-2.0 Mg; 0.20-1.0 Cu; 0.15-1.8 Fe; Mn&#x3c;0.5; Ni&#x3c;1; Ti&#x3c;0.15; Cr&#x3c;0.35; Bi&#x3c;0.8; Pb&#x3c;0.4; Zr&#x3c;0.04; other elements &#x3c;0.05 each and &#x3c;0.15 total, the remainder being aluminum; homogenization of the billet; extrusion of the billet in order to obtain an extruded product; quenching while at extrusion heat; optional cold-deformation and/or straightening, typically by means of pulling and/or drawing, and/or curing of the extruded product; tempering; optional cold-deformation of the extruded product, typically by drawing; machining of the resulting extruded product in order to obtain a turned mechanical part; optional shaping of the resulting mechanical part; anodizing of the resulting mechanical part at a temperature of between 15 and 40 C with a solution comprising between 100 and 250 g/l sulphuric acid and between 10 and 30 g/l oxalic acid and between 5 and 30 g/l of at least one polyol. The anodized turned mechanical parts obtained using the method of the invention have, in particular, advantageous roughness and excellent corrosion resistance and can be used, in particular, as brake pistons or gearbox elements.

Method for the production of an anodised, turned mechanical part made from 6xxx alloy and having low roughness after anodisation

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Voiron, France

Jean-sylvestre Safrany