Manufacture of an air inlet lip or an annular sector of an air inlet lip incorporating openings with a recessed edge

摘要

Manufacture of an air inlet lip or an annular sector of an air inlet lip incorporating openings with a recessed edge The invention relates to a method of manufacturing an air inlet lip comprising:- placing a blank facing a three-dimensional surface for forming a die of a hydroforming tool, the surface three-dimensional comprising an outer annular portion for forming the outer wall of an air inlet lip, the outer annular portion comprising at least one opening imprint protruding from the three-dimensional surface,- forming a preform of air inlet lip (60) by hydroforming the blank on the three-dimensional surface of the die, the air inlet lip preform having a U-shape in section, the outer wall (61) of the air inlet lip comprising at least one recessed housing (62) with a recessed edge (620) and a bottom (621), the housing having a shape corresponding to the shape of said at least one opening cavity, - cutting an opening (622) in each hollow housing (62) cons serving at least the retracted edge (620) so as to obtain an air inlet lip comprising at least one opening having an edge formed integrally with the outer wall of said lip. Figure for abstract: Fig. 9.