Composite annular casing of a compressor for a turbo machine
The invention relates to a composite annular casing for a low-pressure compressor of a turbo machine, including a wall of generally circular form or in a circular arc; a mounting flange extending radially from one side of the wall, forming an edge together with the wall; a main fibrous reinforcement ( 38 ) extending in a continuous manner along the wall and the flange and forming an angled portion and rounded in the area of the edge; an auxiliary fibrous reinforcement ( 56 ) extending along the edge; and a matrix. The auxiliary reinforcement ( 56 ) comprises a core extending along the edge in such a way as to occupy the volume between the edge and the angled portion of the main reinforcement ( 38 ). The invention also relates to a turbo machine comprising a composite annular casing, as well as to a method of manufacturing a composite annular casing of a turbo machine.
1. A method of manufacturing a composite annular casing of a turbo machine including a wall having one of a substantially circular profile and a circular arc, a mounting flange extending radially from one side of the wall and forming together with the wall an edge, said method comprising:
positioning an auxiliary reinforcement in a corner of a moulding surface of an injection mould, the corner forming the edge, the auxiliary reinforcement including a contact surface;
positioning a main reinforcement against the moulding surface such that its form is adapted to that of the auxiliary reinforcement in an area of the corner, the main reinforcement being produced with a rounding structured to come into contact with the contact surface of the auxiliary reinforcement;
closing of the injection mould such that the rounding of the main reinforcement is flattened by the auxiliary reinforcement, and the contact surface of the auxiliary reinforcement is curved inwards by the main reinforcement;
injecting a resin into the injection mould and polymerization of the resin; and
demoulding the composite annular casing.
2. The method according to claim 1 , wherein in the course of closing of the injection mould, at least one of:
the main reinforcement is compacted, and
the main reinforcement and a core are compacted mutually.