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AssigneesConstellium France, Alcan Rehnalu
InventorPhilippe JARRY
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The invention relates to a manufacturing method for making an unwrought semi-finished product having at mid thickness a density of micropores of size greater than 90 μm less than 50% and preferably less than 20% of the density of micropores of size greater than 90 μm obtained by a method according to prior art. The method according to the invention comprises in particular an ultrasound treatment step for the molten metal bath in a furnace and/or a vessel using an immersed device comprising at least one ultrasound transmitter. The semi-finished products obtained according to the method of the invention are particularly advantageous for manufacturing by rolling sheets designed for the aircraft industry to produce spars, ribs, upper and lower wing skins and for manufacturing by extrusion sections designed for the aircraft industry to produce stiffeners.
A manufacturing method for an unwrought aluminum alloy semi-finished product optionally comprising a rolling slab and/or an extrusion billet, said method comprising:
Facility for vertical direct chill semi-continuous casting, said facility comprising:
A method for manufacturing an unwrought aluminum alloy semi-finished product comprising conducting an ultrasound treatment in a furnace and/or a vessel upstream of casting said semi-finished product, wherein said ultrasound treatment decreases dimensions of micropores in solidified metal of said alloy and hydrogen content and grain structure are not modified.
Dependencies are inferred from the claim text.