摘要:
The invention relates to a turbojet casing adapted to receive a plurality of blades and comprising means for attaching one end of each blade to the casing (21, 30). The invention is characterised in that the attachment means extend over a surface of the casing opposite the blades, and the casing comprises holes (26) for the passage of the ends of the blades, such that the latter can engage with the attachment means of the casing. The invention also relates to a turbojet comprising such a casing.
摘要:
The invention relates to a turbojet engine blade and to a turbojet engine receiving such blades, particularly a guide blade, said blade comprising the following elements: an elongate one-piece front portion (2) cut into a pultruded profile, comprising resin-bonded fibres and forming a leading edge; an elongate one-piece rear portion (3) cut into a pultruded profile, comprising resin-bonded fibres and forming a trailing edge; and a skin (5) based on resin-impregnated fibres, extending between the leading edge and the trailing edge in order to form the lateral faces of the blade and covering at least particular zones (6, 7) of the leading edge (2) and the trailing edge (3), all of said elements being assembled by means of hot pressing.
摘要:
The invention relates to a method for producing a part from a composite material, comprising the following steps: production of a mandrel; braiding of a fiber covering (11) around the mandrel, following the shape of the mandrel as closely as possible; local application on the braided covering of at least one fibre patch (12a, 12b, 12c), each patch being formed such that it is sufficiently deformable to closely follow the contour of the braided covering or patch on which it is applied; repetition of the two braiding and patch application steps as many times as necessary in order to obtain the preform; introduction of resin into the preform and polymerisation thereof.
摘要:
The invention relates to a method for manufacturing a part made of a composite material, wherein one or more layers (17) of braided or woven or even draped reinforcing fibers (4) are applied to a mandrel having an overall rotationally symmetrical shape. After one or more layers (17) have been applied to the mandrel (2), an operation is carried out for winding at least one tie (7), which is helically wound around and along the assembly (6) consisting of the mandrel (2) and each layer (17) of reinforcing fibers (4) that said mandrel supports, in order to clamp each layer (17) of reinforcing fibers against said mandrel (2). The invention relates to the manufacture of parts made of a composite material, such as carbon beams, connecting rods or even arms.
摘要:
The invention relates to a process for manufacturing a composite connecting rod (6) from three-dimensional fabric of reinforcing fibres, this connecting rod (6) extending along one main direction, comprising the operations of: - cutting one or more base parts (7, 8) from a three-dimensional fabric; cutting one or more reinforcing parts (9, 10) from a three-dimensional fabric; - installing the various parts (7, 8, 9, 10) on a support in order to shape them; - firmly attaching the various parts (7, 8, 9, 10) to one another by stitching (12, 13, 14, 15) with reinforcing fibres in order to form a preform of reinforcing fibres; - installing the preform on a mandrel; - injecting resin into the preform and polymerization of this resin.
摘要:
The invention relates to a method for braiding reinforcing fibres on a mandrel (8) using a machine comprising a ring (9) carrying at least two series of spools of fibres, by moving this mandrel at a predetermined feed rate and by moving the two series of spools along the ring (9) so that they crisscross by rotating in opposite directions at a predetermined speed of rotation about an axis (AX) of this ring, the braid being formed on the mandrel (8) at a region of convergence (R) of the fibres which together delimit a conical shape (C), characterized in that it comprises: a step of reconfiguring the machine in which the angle (a2) at the vertex of the cone (C) delimited by the fibres adopts a new value (a2); a step of resuming braiding in which the movement of the spools along the ring (9) and the feed rate of the mandrel (8) are re-established at a new feed rate and a new rotational speed.