Method for making hollow parts of composite material

摘要

A method for manufacturing a hollow component made of composite materials, in particular a hot-polymerizing resin/fiber composite. The component (1) comprises enclosing walls (3) which subtend at least one cavity (2). The method uses a mold (7) which assumes the outside shape of the component (1) and comprises the following steps: manufacturing at least one core (11) which corresponds to the shape of the at least one cavity (2), the at least one core (11) comprising a body (12) clad by a silicone-elastomer layer (13) having a high thermal expansion coefficient alpha and an appropriate thickness "e"; cladding the at least one core (11) with at least one resin preimpregnated layer of fiber to form the composite (6) of the component (1), the resin having a curing temperature T1; arranging the at least one core and the composite (6) in the mold (7); hot-polymerizing the resin such that the at least one core (11) exerts an outward compression, generated by thermal expansion during resin polymerization, against the composite (6); and disintegrating the silicone-elastomer layer (13) during resin polymerization with the silicone-elastomer layer (13) having a disintegration temperature T which is less than the curing temperature T1 of the resin.