MANUFACTURING METHOD OF MAKING ALUMINUM ALLOY SEMI-FINISHED PRODUCT WITH IMPROVED MICROPOROSITY
First Claim
1. A manufacturing method for an unwrought aluminum alloy semi-finished product optionally comprising a rolling slab and/or an extrusion billet, said method comprising:
- (i) preparing a molten metal bath of an alloy having a composition comprising, percentage by weight;
Zn;
0-12Cu;
0-6Mg;
0-6Li;
0-3Ag;
0-1Si<
0.5Fe<
0.5optionally at least one of Cr, Zr, Mn, Hf, Ti, Sc, V, B, with a content<
0.5, remainder aluminum,(ii) treating with ultrasound said molten metal bath in a furnace and/or a vessel using an immersed device comprising at least one ultrasound transmitter,(iii) transferring said molten metal bath so treated to a solidification device,(iv) vertical direct chill semi-continuous casting said treated molten metal bath.
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Accused Products
Abstract
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.
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Citations
23 Claims
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1. A manufacturing method for an unwrought aluminum alloy semi-finished product optionally comprising a rolling slab and/or an extrusion billet, said method comprising:
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(i) preparing a molten metal bath of an alloy having a composition comprising, percentage by weight; Zn;
0-12Cu;
0-6Mg;
0-6Li;
0-3Ag;
0-1Si<
0.5Fe<
0.5optionally at least one of Cr, Zr, Mn, Hf, Ti, Sc, V, B, with a content<
0.5, remainder aluminum,(ii) treating with ultrasound said molten metal bath in a furnace and/or a vessel using an immersed device comprising at least one ultrasound transmitter, (iii) transferring said molten metal bath so treated to a solidification device, (iv) vertical direct chill semi-continuous casting said treated molten metal bath. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16)
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12. Facility for vertical direct chill semi-continuous casting, said facility comprising:
- at least one furnace for melting metal and/or keeping metal at a given temperature and/or operations for preparing molten metal and adjusting the composition of said metal, at least one vessel designed to perform a treatment to remove impurities that are dissolved and/or are in suspension in molten metal, a device for solidifying molten metal by vertical direct chill semi-continuous casting, said device for solidifying comprising at least one ingot mould, a bottom block, a device to move downwardly, at least one device for procuring molten metal and a cooling system, wherein said furnace, said vessel and said device for solidifying being connected to each other by troughs in which molten metal can be transported, wherein said facility further comprises at least one immersed device comprising at least one ultrasound transmitter positioned in a furnace and/or a vessel.
- View Dependent Claims (13)
- 17. 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.
Specification