Replicable shaping of a fiber blank

A method for shaping a fiber blank extending longitudinally along a direction X and transversally along a direction Y, obtained by three-dimensional weaving between a plurality of warp threads and a plurality of weft threads and intended to form a fiber preform for a turbomachine blade, the fiber blank comprising a root blank intended to form the blade root and a airfoil blank intended to form the blade airfoil, the fiber blank comprising a reference face extending in the direction Y between a first edge and a second edge intended to form the leading edge and the trailing edge of the blade, the fiber blank further comprising a warp tracer thread extending over the reference face along the direction X from the root blank and at least one weft tracer thread extending over the reference face along the direction Y between the first edge and the second edge, the method comprising:

• placing the fiber blank in a shaping mold in such a way that the reference face is visible,
• retaining the root blank in the shaping mold,
• projecting at least one visual reference of the warp on the reference face of the fiber blank corresponding to a reference location of the warp tracer thread,
• deforming the airfoil blank from the bottom of the airfoil blank to the top of the airfoil blank along the direction X in a first deformation bottom-to-top sequence to progressively align the warp tracer thread with the warp visual reference,
• projecting at least one weft visual reference on the reference face of the fiber blank corresponding to a reference location of the weft tracer, and
• deforming the airfoil blank along the direction Y in a second deformation sequence different from the first deformation bottom-to-top sequence from the warp tracer thread outwardly to the first edge and from the warp tracer thread outwardly to the second edge of the blank to progressively align the weft tracer thread with the projected weft visual reference.