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OwnerAlexander Igumenov, Viktor Valkov +1inventors
InventorsAlexander Igumenov, Viktor Valkov, Viktor Budanov
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The present invention relates to the method of fabrication of wrought semiproducts from high strength aluminium-based alloys, and fabrication of articles from such semiproducts e.g frames, fittings, beams, etc. used in aerospace engineering and transportation facilities. The suggested method comprises: casting an ingot, homogenization, forging the ingot, extrusion of the wrought billet, solution heat treatment, cold working in two steps: 1. stretching with 1-5% permanent set, 2. multi-axial shaping of the billet by bending while simultaneously performing the local plastic deformation of the billet by compressing (1-20%) the joint places of the blank parts being disposed at an angle of 45-135° to each other; two stage ageing: 1st stage=heating to 90-120° C. for 5-24 hours; 2nd stage=heating to 160-190° C. for 5-20 hours. The suggested method allows to fabricate long, irregular-shaped semiproducts from wrought aluminium-based alloys having high strength and fracture toughness and low level of residual stresses, thereby providing the fabrication of products without any distortion or buckling upon machining.
Method of fabrication of semiproducts from aluminium-based alloy, which method comprising casting an ingot, homogenization, forging an ingot, extrusion of the forged billet, solution heat treatment and quenching, cold working and ageing of the billet, wherein cold working after solution heat treatment and quenching is performed in two steps, the first step of which comprises stretching of the as-quenched extruded billet, the second step comprises multi-axial shaping of the billet by bending while simultaneously performing the local plastic deformation of the billet by compressing the joint places of the blank parts, said parts being disposed at a predetermined angle to each other.
Dependencies are inferred from the claim text.