Patent AT-E401161-T1: [Translated] HOLLOW FAN BLADE FOR FLOW MACHINE AND CORRESPONDING PRODUCTION PROCESS

A method for making a hollow fan blade includes the steps of: forming a plurality of ribs (42) on a first substrate (31), the first substrate (31) including cavities (40) on either side of each of the plurality of ribs; abutting the plurality of ribs (42) on the first substrate (31) with a second substrate (31) to form a hollow fan blade (30); and forming the hollow fan blade (30) into an airfoil shape while pressure inside the cavities (40) is substantially ambient pressure.