Extruded products for aeroplane floors made of an aluminium-copper-lithium alloy

Abstract

The invention relates in particular to an unprocessed extruded product for manufacturing a machined extruded product for the aeronautical industry, made of an Al-Cu-Li alloy with the following composition, as weight percentages: Cu: 2.0 - 6.0; Li: 0.5 - 2.0; Mg: 0 - 1.0; Ag: 0 - 0.7; Zn 0 - 1.0; and at least one element selected among Zr, Mn, Cr, Se, Hf and Ti, the amount of said element, if chosen, being 0.05 to 0.20 wt % for Zr, 0.05 to 0.8 wt % for Mn, 0.05 to 0.3 wt % for Cr and for Se, 0.05 to 0.5 wt % for Hf and 0.01 to 0.15 wt % for Ti, Si <= 0.1; Fe <= 0.1; others <= 0.05 each and <= 0.15 in total, the balance being aluminium, having an unprocessed core (21) with an aspect ratio of at least 5 and at least one unprocessed flank (22) with an aspect ratio of less than 4 and in which the length direction is substantially perpendicular to the lengthwise direction of the core, characterized in that a portion of the unprocessed flank (22) connecting the unprocessed flank to the unprocessed core has decreasing thickness and in that the ratio of the thickness of said unprocessed flank (22) at the end of said unprocessed flank connected to the web (E221) to that at the end thereof opposite the core (E222) - i.e. E221 / E222 - is less than 0.8, thus defining two substantially symmetrical concave areas.; The invention also relates to the method for manufacturing a machined extruded product and to the corresponding machined extruded product. The products according to the invention are useful in particular for manufacturing floor beams and girders.

Description

technical field [0001] The present invention relates to extruded articles made of aluminium-copper-lithium alloys, and more particularly to such articles, their method of manufacture and their use, especially for aeronautical and aerospace construction. Background technique [0002] Extrusions made of aluminum alloys were developed to produce high-strength components especially for the aeronautical and aerospace industries. [0003] In the aerospace industry, extrusions made of aluminum alloys are used in many applications, such as fuselage reinforcements and stringers, fuselage frames, wing reinforcements, floor girders (poutredeplancher) and floor beams (traversedeplancher) and seat rails. [0004] The method for manufacturing extruded products made of Al-Cu-Li alloys for the aviation industry comprises the steps of manufacturing crude extruded products by casting, homogenizing, extruding, solution heat treatment, quenching, Controlled traction while stress relieving and...

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Problems solved by technology

However, this tortuous channel makes the extrusion method critical

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