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1. A tooling for injecting a polymer resin into a fibrous preform for the manufacture of a revolution part in composite material comprising a barrel shape with an inside diameter of smaller diameter delimiting said revolution part into an upstream portion and a downstream portion of said inside diameter, said upstream portion including a back-draft intermediate portion, wherein, to allow a demolding of said barrel-shaped part once injection and polymerization of said polymer resin are carried out, the tooling for injecting includes on the one hand a frustoconical central drum comprising a first drum portion in direct contact with an inner surface of said portion of the revolution part downstream of said inside diameter and a second drum portion and on the other hand a segmented insert whose outer surface matches an inner surface of said portion of the revolution part upstream of said inside diameter and an inner surface is in direct contact with said second drum portion on which said segmented insert rests, said first drum portion including a natural draft allowing a withdrawal of said frustoconical central drum from downstream and said inner surface of the segmented insert having an inclination strictly greater than a maximum slope of an outer surface of the segmented insert corresponding to said back-draft upstream intermediate portion of said revolution part, so as to allow a withdrawal of said segmented insert from upstream, and wherein the injection tooling includes an upstream flange connected with fasteners to the frustoconical central drum and configured for releasing the segmented insert which can be withdrawn along a direction of a slope of the second drum portion.
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