Device for manufacturing a stiffened panel making it possible to control the geometry of said stiffened panel, and method for manufacturing a stiffened panel using said device

A device for manufacturing a stiffened panel comprising a panel and reinforcements which each have a final thickness and a final height, the device comprising

• at least one support having a bearing surface, and
• tools which are configured to each support a preform of fibers having a U-shaped or C-shaped cross section with a base and two wings, each tool having a first face configured to receive the base of the preform of fibers, a second face configured to be positioned against the bearing surface of the support and first and second lateral faces which connect the first and second faces and which are configured to contact the two wings of the preform of fibers, at least one of the first and second lateral faces having a set-back portion which, when two tools are juxtaposed, defines a recess opening out at the first faces and configured to form one of the reinforcements during a consolidation or polymerization step, each tool being subjected, in operation, to a first temperature and then to a second temperature greater than the first temperature during the consolidation or polymerization step, wherein the tools are dimensioned such that each recess has a width at the second temperature that is substantially equal to the final thickness of the reinforcement to be formed in the recess
• wherein each tool comprises, only at each set-back portion, an expandable coating configured to selectively expand toward an end edge face of one of the two wings as a function of temperature.