Method for manufacturing hollow objects from composite material by contact winding on an expandable mandrel and objects obtained by such a method.

摘要

- The subject of the invention is a method in which pre-impregnated fibres are placed on an expandable, extractable mandrel (6, 12; 15) which may or may not be recovered, which is then expanded inside a suitable shaping device (23), during the polymerisation of the composite material, characterised in that the fibres are wound and/or laid down in contact, forming, on the mandrel (6, 12; 15), with the axis (13) of the mandrel, a suitable angle which may approach or reach 90@ for the so-called circumferential fibres, at least these forming, on the mandrel, a sinuous line (14) or formed by discontinuous elements (T1 to T4), so as to permit the circumferential expansion of the said fibres during the radial expansion of the mandrel. - Application to the manufacture of hollow objects, especially connecting rods. <IMAGE>