Patent ID: 8689442

Claim:
A method for fabricating at least one chosen from integrally bladed rotors and stators for gas-turbine engines, comprising: cutting a stiffness-optimized pre-machining contour into a blank with a cutting process, the pre-machining contour being cut: by a plurality of essentially straight cuts; at a certain distance from what will become respective pressure sides and suction sides of adjacent blades along straight control surfaces at a cutting angle varying in correspondence with a blade twist, the essentially straight cuts made transversely to the blades giving each portion of the blank to become a blade an essentially quadrilateral transverse cross-section along its length; along a conical surface extending a certain distance from what will become an annulus surface at bases of the blades; and along a transition surface between the conical surface and the control surfaces; and subsequently finishing the blank to a final contour of the suction sides and the pressure sides of the blades, the annulus surface and the transition surface in a finishing process which follows the final contour; the finishing process being a different type of process than the cutting process.