the vacuum between the membrane and the rigid portion vacuum uptakes are used the latter may be located either on the membrane using one or several vacuum outputs or via one or several orifices located in the mould the generator is then activated which produces an alternating current which makes it possible to create a magnetic field thanks to the inductor thanks to this magnetic field the rigid portion heats and the heat that it produces is transferred to the prepreg by means of conduction the prepreg liquefies at its melting temperature and envelopes by the same the rigid portion the heated prepreg forms the composite part on the rigid portion with the maintaining of the force generated by the flexible membrane on the rigid portion the prepreg is then cooled to a defined temperature for example approximately 60 u00b0 c via a system of a stream of air which ventilates the upper portion of the device this step fixes the final structural and dimensional characteristics of the composite part as well as its final appearance a method of producing a part made from composite materials is accelerated thanks to the molding device according to an embodiment for example the carrying out of a part made from composite materials using four folds of prepreg made of polyamide reinforced with carbon fibers at approximately 250 u00b0 c lasts three minutes with the molding device according to an embodiment which is provided with a generator with a power of approximately 2000 w and which operates at a frequency of.