Exterior ferrule of an intermediate housing made of composite material for an aircraft turbine engine

Method for manufacturing an exterior ferrule of an intermediate casing for an aircraft turbine engine, the ferrule made from composite material comprising an annular connecting downstream end forming a peripheral groove radially open towards the outside, said groove being intended to receive a complementary connecting member provided on one or more nacelle cowls, and this groove being delimited by an upstream groove wall, as well as by a downstream groove wall,

• characterised in that the method includes the following steps:
• producing a first fibrous preform by three-dimensional weaving of threads, the first preform being intended to define a barrel of the ferrule and a structural part of the downstream groove wall, projecting radially outwards with respect to the barrel;
• producing a second fibrous preform or a group of second fibrous preforms, each second fibrous preform being obtained by three-dimensional weaving of threads, the second preform or the group of second preforms being intended to define a base as well as a structural part of the upstream groove wall, projecting radially outwards with respect to the barrel;
• injecting and polymerising a matrix for densifying the first preform;
• and
• injecting and polymerising a matrix for densifying the second preform or the group of second preforms, so that the base is fixedly and externally attached to the barrel of the ferrule.