Patent ID: 6866223

Claim:
Process for forming sectors of an air intake lip of an aircraft nacelle, of U-shaped transverse cross-section, characterized in that it consists in producing, from a cylindrical billet ( 11 ) of a suitable material, by hot die pressing, a tubular profile ( 12 ) of U-shaped transverse cross-section whose ends are interconnected, a portion of U-shaped section (S 1 ) having a development less by several percent than the development of the smallest cross-section of the sector of lip to be obtained, giving to the profile ( 12 ) at the outlet of the die ( 15 ) a curvature whose radius is substantially equal to the mean radius of curvature of said sector, then forming and calibrating the profile ( 12 ) to the final shapes of the sector by hydraulic expansion in a matrix (M 1 , M 2 ) whose interior corresponds to the external volume of said sector increased by the resilient return of the material to be expanded, and finally, cutting off the tubular product thus obtained to separate the U-shaped transverse cross-section portion constituting said lip sector.