Abstract: A triaxial textile armature is provided for making composite materials. The armature includes a central layer of axial yarns cross-linked by bias yarns extending in a first and a second direction the bias yarns extending in the first direction passing through the central layer of axial yarns in even intervals between axial yarns of the central, and the bias yarns extending in the second direction passing through the central layer of axial yarns in odd intervals.

Abstract: A triaxial textile armature is provided for making high quality composite materials. The armature includes a central layer of axial yarns and at least two side layers of axial yarns.

Abstract: A reinforcement insert includes superposed laps of fiber which are coupled to each other by a coupling fiber which passes through the laps in order to form fiber sections wherein at least certain sections thereof are rectilinear. The fiber sections and laps are immersed in a cured resin. The total density of the fibers that make up the insert ranges from 50% to 60% of the volume of the insert and the fiber sections take up 3%-10% of the volume of the insert. A method for creating a sandwich structure includes at least one such insert.

Abstract: A reinforcement insert includes superposed laps of fiber which are coupled to each other by a coupling fiber which passes through the laps in order to form fiber sections wherein at least certain sections thereof are rectilinear. The fiber sections and laps are immersed in a cured resin. The total density of the fibers that make up the insert ranges from 50% to 60% of the volume of the insert and the fiber sections take up 3%-10% of the volume of the insert. A method for creating a sandwich structure includes at least one such insert.

Abstract: A method of producing a double-walled thermo-structural composite monolith may include assembling, by stitching, a sandwich having a core and outer fibrous armors. The stitched sandwich structure is impregnated with a viscous resin. After the resin hardens, the core is removed from the sandwich structure.

Abstract: A weaving device for the production of thick textile armatures constituted by superposed layers of threads secured together by a binding thread traversing the layers, includes a frame provided laterally and at its periphery with regularly distributed hooking pins, elements for depositing with the aid of the pins, thread and elements for flattening the layers. The pins have a first section with a slight inclination outwardly of the frame and a second straight section prolonging the first and having an a substantially greater inclination outwardly of the frame. The elements for depositing thread include a plurality of guides each supplying a thread, and are moved simultaneously and spaced at an interval equal to n times the interval between pins. The elements for weaving the layers include elements adapted to press the assembly of the layers about their periphery.

Abstract: The invention concerns a method characterized in that it consists in assembling by stitching a sandwich consisting of a core and outer fibrous armors and impregnating the stitching thread during the impregnation process of said fibrous armours, and thereafter eliminating said core, said stitching fiber forming spacers (23) between the skins (21, 22).

Abstract: The object of the invention is a weaving device for the production of thick textile armatures constituted by superposed layers of threads secured together by a binding thread traversing said layers, said device comprising a frame (13) provided laterally and at its periphery with regularly distributed hooking pins (17), means (21) for depositing with the aid of said pins, thread (22) and means for compressing the layers, characterized in that said pins (17) are constituted by pins comprising a first section (17a) with a slight inclination outwardly of the frame and a second straight section (17b) prolonging the first and having an a substantially greater inclination outwardly of the frame, in that said means for depositing thread are constituted by a plurality of guides (21) each supplying a thread (22), and moved simultaneously and spaced at an interval equal to n times the interval between pins, and in that said means for weaving the layers are constituted by means (23 to 25) adapted to press the assembly (1

Abstract: The object of the invention is a process for the production of a multi-directional textile preform, in which there is deposited on a substrate suitable for stitching (M) a first layer of sections of thread, then, if desired, one or several other layers in different directions, so as to produce a sequence of depositions, then, carrying out if desired one or several other sequences of deposition of layers, each section of thread (31, 32, 33) being, at each end, fixed by stitching without knotting into said substrate (M) with the help of a needle (11, 12), characterized in that the stitching at the two ends of each section (31, 32, 33) is carried out independently with the help of two needles (11, 12) using separate threads (Pl , P2) from that of the layers, the end of the section of thread being, upon arrival of the deposition head at the height of its point of turning back, fixed by the stitching thread, the embedded stitching needle serving as a hooking pin for the thread during deposition of the following se

Abstract: The present invention relates to a connecting rod made of composite material, especially for internal-combustion engines, the composite material being formed by a reinforcement embedded in a cured material, and the connecting rod (A) comprising, along the longitudinal extension (X—X) of the connecting rod, a central shank (B) extended respectively, at its two ends, by a connecting-rod big end (C) and a connecting-rod small end (D). According to the invention, the connecting rod (A) is produced entirely as a single component made of composite material and the reinforcement of the composite material comprises superposed plies of crossed straight filling yarns, the filling yarns, which extend parallel to the longitudinal extension (X—X) of the connecting rod (A), constituting at least twice the volume percentage of the filling yarns which extend in each of the directions other than the longitudinal extension (X—X) of the connecting rod (A), and binding yarns pass through the superposed plies.

Abstract: The present invention relates to the production of a reinforcement for a composite component, comprising a fibrous substrate (22, 23) reinforced by a stitching thread forming stitches (27.1, 27.2; 30.1, 30.2; 33.1, 33.2 and 36.1, 36.2) passing through said substrate. According to the invention, said stitches are oblique and pass through said substrate slantwise, making an angle of inclination of at most 30.degree.. It is advantageous for said fibrous substrate to consist of plies of crossed threads (22, 23) defining mesh cells (24) through which said stitches pass.

Abstract: A method of making a connecting rod made of composite material, especially for internal-combustion engines, the composite material being formed by a reinforcement embedded in a cured material, and the connecting rod (A) comprising, along the longitudinal extension (X-X) of the connecting rod, a central shank (B) extended respectively, at its two ends, by a connecting-rod big end (C) and a connecting-rod small end (D). The connecting rod (A) is produced entirely as a single component made of composite material and the reinforcement of the composite material comprises superposed plies of crossed straight filling yarns, the filling yarns, which extend parallel to the longitudinal extension (X-X) of the connecting rod (A), constituting at least twice the volume percentage of the filling yarns which extend in each of the directions other than the longitudinal extension (X-X) of the connecting rod (A), and binding yarns which pass through the superposed plies.

Abstract: The present invention relates to a method and to a system for producing a reinforcement for a composite component, formed by said reinforcement embedded in a cured matrix, said reinforcement comprising superposed plies of thread. According to the invention, the system comprises means (5) for the memory storage and processing of data, in which means the mathematical model of the reinforcement (A) to be produced may be created and stored in memory and which are capable of controlling means (3) for steering the tool (1) for laying down and/or stitching thread (F).

Abstract: The invention relates to a method for producing a reinforcement in the form of a sheet for a composite component, the reinforcement including superposed plies of thread. In accordance with the method, straight portions of thread are arranged, for each ply, at least substantially in a parallel fashion with respect to each other and all the superposed plies are consolidated by using a thread passing through the plies. According to the invention, the superposed plies are laid down on a support, the superposed plies are compacted by mechanical pressure, and in order to preserve the state of compaction of the plies which is thus obtained, the thread for consolidating the plies is stitched, without knotting, through the plies down to at least the level of the surface of the support, the plies having, after compaction, a density of the portions of the thread constituting them which is sufficient to retain the consolidating thread by friction.

Abstract: The present invention relates to a method and a machine for producing a reinforcement in the form of a block for a composite component formed by said reinforcement embedded in a cured matrix.According to the invention, said block (B) is made up by continuously forming a succession of superposed sheets, and the machine, comprising a stand provided with a subframe and with uprights for mounting at least one frame which can move along said uprights, capable of receiving a thread laying-down tool which can move in a plane transverse to said uprights, is noteworthy in that it comprises an additional frame (6) which can move along said uprights (4) and is provided with pegs (9) for hooking on said straight portions of thread (F).

Abstract: A machine for producing a reinforcement for a composite component. The machine includes a stand with a subframe having uprights with slideways for mounting a transverse bar on which is mounted a movable carriage. The carriage has a first movable arm extending in another direction and includes a second movable arm. The carriage is movable in a first direction, X, the first arm is movable in a second direction, Y, orthogonal to the first, and the second arm is movable transversely with respect to the plane defined by the bar and first arm in a third, Z, direction. Motors are provided to producing such movements. The second arm includes a thread-stitching tool which also constitutes a tool for laying down the thread and is mounted on a rotary support at the lower end of which is arranged the needle.

Abstract: The present invention relates to a method for producing a reinforcement for a composite component, said reinforcement including superposed plies of thread, according to which method:straight portions of thread are laid down on a support; andall the superposed plies are consolidated by stitching, without knotting, a continuous thread.According to the invention:said straight portions of thread (4, 5) are laid down by means of a needle, with respect to which the continuous thread (F), of which each of said portions forms part, can slide, said needle being capable of moving relative to said support (6), pulling tight the straight portion of thread (4, 5) above the latter, over an extent equal to the length of said straight portion of thread; andsaid straight portions of thread (4, 5) are fixed by stitching, without knotting, at least one of the ends (4a, 4b; 5a, 5b) of each of said portions of thread into said support (6) using said needle.

Abstract: The present invention relates to a stitching head, which can be used in a machine for producing a reinforcement in the form of a sheet for a composite component formed by said reinforcement embedded in a cured matrix, said reinforcement comprising superposed plies of thread through which passes a consolidating thread, said head including a support carrying, on the one hand, means of linkage to the machine and, on the other hand, a needle as well as means for guiding the consolidating thread right to said needle.According to the invention, said stitching head (P) includes, associated with said needle (33), a device (43, 50) for compacting said superposed plies of thread.

Abstract: Method for producing a fibrous reinforcement (1) for a component of composite material comprising at least two non-coplanar walls, which are for example orthogonal.According to the invention, at least one first fibrous element (2) is produced as a fiber mat, said first fibrous element (2) is applied via one of its narrow sides (4) against a first face (5) of a second element; and there are inserted, through a second face (7) of said second element (3), on the opposite side to said first face (5), and by the stitching without knotting of a continuous filament (F) by means of a needle, transverse fibers passing through said second element (3).Production of fiber-matrix composite components.

Abstract: A three-dimensional weave is formed having a triple set of rods and yarns. The network of rods is placed about the generatrices of the body of revolution to be made and ordered regularly around the axis of the latter in coaxial layers of revolution and in successive radial bunches. Circumferential yarns and radial yarns are laid in helical courses and woven into said network of rods around the axis.