Manufacture of an air inlet lip or ring sector of an air inlet lip incorporating openings with turned-in edges

A method for manufacturing an air intake lip or an air intake lip annular sector comprising:

• the arrangement of a blank facing a three-dimensional forming surface of a die of a hydroforming tool, the three-dimensional surface comprising an outer annular portion for forming the outer wall of an air intake lip or of an air intake lip annular sector, the outer annular portion comprising at least one opening cavity protruding over the three-dimensional surface,
• the forming of an air intake lip or air intake lip sector preform by hydroforming the blank on the three-dimensional surface of the die, the air intake lip or the air intake lip annular sector preform having in section a U-shape, the outer wall of the air intake lip or of the air intake lip annular sector preform comprising at least one hollow housing with an inturned edge and a bottom, the housing having a shape corresponding to the shape of said at least one opening cavity,
• the cutting of an opening in each hollow housing keeping at least the inturned edge so as to obtain an air intake lip or an air intake lip sector comprising at least one opening having an edge integrally formed with the outer wall of said lip or said sector.