Method of fabricating a spar for a blade, a method of fabricating a blade, and a blade

A method of fabricating a spar of a blade from tapes of composite materials, the spar comprising transversely at least one arrangement, each arrangement suitable for being disposed about a root axis, the method comprising the following steps:

• during a preparation step, defining a pressure-side mold and a suction-side mold for each arrangement that is to be fabricated, each mold comprising a base extending longitudinally in the span direction of the spar and defining a laying surface that includes:
• a root zone having a root wall, the root wall forming two flanks;
• a connection zone presenting two sloping connection walls extending away from each other at a first angle and connected respectively to the two flanks;
• and
• a running zone presenting two running walls respectively extending the two connection walls;
• during a fabrication step, for each arrangement being subdivided into a pressure-side subassembly and a suction-side subassembly, each subassembly having a respective hank, each hank comprising a plurality of tape segments stacked on one another, each mold having at least one lateral removable slide defining the mold transversely by extending vertically from the base, and/or at least one longitudinal removable slide defining the mold longitudinally by extending vertically from the base:
• removing each slide from each mold;
• fabricating the pressure-side subassembly and the suction-side subassembly of an arrangement respectively on the pressure-side mold and on the suction-side mold corresponding to the arrangement, each subassembly being fabricated by stacking tape segments on the corresponding mold by a method of placing fibers with the help of a placement head, the placement head laying the segment on the laying surface of the mold;
• and
• closing each mold by putting each slide of the mold into place, and juxtaposing the molds in order to form a closed enclosure in which the subassemblies are to be found;
• and
• during a finalizing step, heating the spar within the juxtaposed molds.