Abstract: An installation for forming a fiber preform, includes a follower roller. The follower roller presents a profile in section that has at least a first slope forming an angle with the axis of the follower roller and a second slope forming a second angle with the axis of the follower roller that is different from the first angle. The installation also has at least one backing roller presenting a shape complementary to the first and second slopes, the installation including a holder for holding each backing roller and configured to hold the backing roller at a predetermined distance from the first and second slopes or configured to apply contact pressure from the backing roller against the first and second slopes.

Abstract: A process for shaping a fibrous preform includes the insertion of each attachment tab of a fibrous texture into a corresponding aperture of an impregnation mandrel, the attachment by a removable retaining device of each tab inserted into each aperture against a surface of the impregnation mandrel, the winding under tension of the fibrous texture on the impregnation mandrel in order to obtain a fibrous preform.

Abstract: A method of fabricating a composite material casing of varying thickness for a gas turbine includes using three-dimensional or multilayer weaving to make a fiber texture in the form of a strip; winding the fiber texture as a plurality of superposed layers onto a mandrel of profile corresponding to the profile of the casing to be fabricated, so as to obtain a fiber preform of shape corresponding to the shape of the casing to be fabricated; and densifying the fiber preform with a matrix. During winding of the fiber texture on the mandrel, a textile strip is interposed between the adjacent turns of the fiber texture, the textile strip presenting a width that is less than the width of the fiber texture and defining a retention zone of the casing.

Abstract: A method of fabricating a textile structure of varying thickness including using a loom to weave a fiber texture in the form of a strip extending lengthwise along a longitudinal axis and widthwise along an axis perpendicular to the longitudinal axis, and causing the texture to be wound under tension onto a mandrel. The texture includes a portion presenting extra thickness. During the winding of the texture, a spacer element is interposed between adjacent turns of the fiber texture onto the mandrel. Each spacer element extends in the width direction of the texture over a portion thereof situated outside the portion of extra thickness and presenting, over the portion of the texture situated outside the portion of extra thickness, a thickness that corresponds at least to the difference between thicknesses of the portion of extra thickness and of the portion of the texture situated outside the portion of extra thickness.

Abstract: A fiber texture presents the shape of a strip extending in a longitudinal direction over a determined length between a proximal portion and a distal portion, and in a lateral direction over a determined width between first and second lateral edges. The fiber texture presents three-dimensional or multilayer weaving. The proximal portion of the fiber texture includes an end portion extending in the lateral direction so as to be set back from at least one of the first and second lateral edges and over a determined width that is less than the width of the fiber texture. The end portion projects in the longitudinal direction from at least one longitudinal edge of the fiber texture, the end portion extending in the longitudinal direction between a first end connected to the fiber texture and a free, second end opposite from the first end.

Abstract: A method of fabricating a composite material casing of varying thickness for a gas turbine includes using three-dimensional or multilayer weaving to make a fiber texture in the form of a strip; winding the fiber texture as a plurality of superposed layers onto a mandrel of profile corresponding to the profile of the casing to be fabricated, so as to obtain a fiber preform of shape corresponding to the shape of the casing to be fabricated; and densifying the fiber preform with a matrix. During winding of the fiber texture on the mandrel, a textile strip is interposed between the adjacent turns of the fiber texture, the textile strip presenting a width that is less than the width of the fiber texture and defining a retention zone of the casing.

Abstract: A process for shaping a fibrous preform includes the insertion of each attachment tab of a fibrous texture into a corresponding aperture of an impregnation mandrel, the attachment by a removable retaining device of each tab inserted into each aperture against a surface of the impregnation mandrel, the winding under tension of the fibrous texture on the impregnation mandrel in order to obtain a fibrous preform.

Abstract: An installation for shaping an axisymmetric fiber preform presenting a profile that varies in radial section, includes a storage mandrel for storing a fiber texture in the form of a wound strip, one or more follower rollers, and an axisymmetric mold, the storage mandrel, each follower roller, and the mold presenting across their axial widths radii that vary defining outside surfaces having respective profiles in relief, at least one follower roller including a plurality of roller segments, each extending over a fraction of the axial width of the follower roller, each roller segment including a platen defining a portion of the outside surface of the follower roller; and an actuator system suitable for moving the platen of the roller segment in a direction that is radial relative to the axis of the follower roller.

Abstract: An installation for shaping an axisymmetric fiber preform presenting a profile that varies in radial section, includes a storage mandrel for storing a fiber texture in the form of a wound strip, one or more follower rollers, and an axisymmetric mold on which the fiber texture is to be shaped by being wound, the follower roller(s) being placed between the storage mandrel and the axisymmetric mold, the installation including at least one tension adjustment device for adjusting tension on the fiber texture, the device including at least one row of rods aligned in a first direction parallel to an axis of rotation of one or more follower rollers; each rod presenting an endpiece at a free end in order to come into contact with the fiber texture.

Abstract: An installation for shaping a fiber preform as a body of revolution presenting a profile that varies in radial section, the installation including a storage mandrel for storing a fiber texture, follower rollers, and a mold in the form of a body of revolution on which the fiber texture is to be shaped by winding, the follower roller(s) being placed between the storage mandrel and the mold in the form of a body of revolution. The storage mandrel, each follower roller, and the mold present radii across their axial widths that vary to define outer surfaces having profiles in relief. A follower roller has sectors releasably fastened on the outer surface of the roller, each sector extending over a fraction of the circumference of the roller and over all or part of the axial width of the roller.

Abstract: An installation for forming a fiber preform, includes a follower roller. The follower roller presents a profile in section that has at least a first slope forming an angle with the axis of the follower roller and a second slope forming a second angle with the axis of the follower roller that is different from the first angle. The installation also has at least one backing roller presenting a shape complementary to the first and second slopes, the installation including a holder for holding each backing roller and configured to hold the backing roller at a predetermined distance from the first and second slopes or configured to apply contact pressure from the backing roller against the first and second slopes.

Abstract: An installation for shaping an axisymmetric fiber preform presenting a profile that varies in radial section, includes a storage mandrel for storing a fiber texture in the form of a wound strip, one or more follower rollers, and an axisymmetric mold, the storage mandrel, each follower roller, and the mold presenting across their axial widths radii that vary defining outside surfaces having respective profiles in relief, at least one follower roller including a plurality of roller segments, each extending over a fraction of the axial width of the follower roller, each roller segment including a platen defining a portion of the outside surface of the follower roller; and an actuator system suitable for moving the platen of the roller segment in a direction that is radial relative to the axis of the follower roller.

Abstract: An installation for shaping an axisymmetric fiber preform presenting a profile that varies in radial section, includes a storage mandrel for storing a fiber texture in the form of a wound strip, one or more follower rollers, and an axisymmetric mold on which the fiber texture is to be shaped by being wound, the follower roller(s) being placed between the storage mandrel and the axisymmetric mold, the installation including at least one tension adjustment device for adjusting tension on the fiber texture, the device including at least one row of rods aligned in a first direction parallel to an axis of rotation of one or more follower rollers; each rod presenting an endpiece at a free end in order to come into contact with the fiber texture.

Abstract: An installation for fabricating a fiber texture in the form of a strip presenting a profile that varies at least in cross-section includes a loom, one or more take-up rollers, and a storage mandrel, each take-up roller and the storage mandrel presenting a radius that varies across its axial width so as to define an outer surface having a profile in relief. One or more take-up rollers include a plurality of sectors releasably fastened on the outer surface of the take-up roller. Each sector extends over a fraction of the circumference of the take-up roller and over all or part of the axial width of the take-up roller. Each sector also presents at least one thickness that is determined in such a manner as to modify locally the thickness of the profile in relief of the outer surface of the take-up roller.

Abstract: A warp yarn take-up system includes a clamping device for holding a plurality of layers of warp yarns, the clamping device being movable at least in a direction corresponding to the advance direction of the warp yarns. The clamping device includes a bottom clamp, a top clamp, and at least one intermediate clamping element present between the bottom clamp and the top clamp. The bottom clamp, the top clamp, and the at least one intermediate clamping element are held together by clamping.

Abstract: An installation for fabricating a fiber texture in the form of a strip presenting a profile that varies at least in cross-section includes a loom, one or more take-up rollers, and a storage mandrel, each take-up roller and the storage mandrel presenting a radius that varies across its axial width so as to define an outer surface having a profile in relief. One or more take-up rollers include a plurality of sectors releasably fastened on the outer surface of the take-up roller. Each sector extends over a fraction of the circumference of the take-up roller and over all or part of the axial width of the take-up roller. Each sector also presents at least one thickness that is determined in such a manner as to modify locally the thickness of the profile in relief of the outer surface of the take-up roller.

Abstract: An installation for shaping a fiber preform as a body of revolution presenting a profile that varies in radial section, the installation including a storage mandrel for storing a fiber texture, follower rollers, and a mold in the form of a body of revolution on which the fiber texture is to be shaped by winding, the follower roller(s) being placed between the storage mandrel and the mold in the form of a body of revolution. The storage mandrel, each follower roller, and the mold present radii across their axial widths that vary to define outer surfaces having profiles in relief. A follower roller has sectors releasably fastened on the outer surface of the roller, each sector extending over a fraction of the circumference of the roller and over all or part of the axial width of the roller.

Abstract: A fiber texture presents the shape of a strip extending in a longitudinal direction over a determined length between a proximal portion and a distal portion, and in a lateral direction over a determined width between first and second lateral edges. The fiber texture presents three-dimensional or multilayer weaving. The proximal portion of the fiber texture includes an end portion extending in the lateral direction so as to be set back from at least one of the first and second lateral edges and over a determined width that is less than the width of the fiber texture. The end portion projects in the longitudinal direction from at least one longitudinal edge of the fiber texture, the end portion extending in the longitudinal direction between a first end connected to the fiber texture and a free, second end opposite from the first end.

Abstract: A method of fabricating a textile structure of varying thickness including using a loom to weave a fiber texture in the form of a strip extending lengthwise along a longitudinal axis and widthwise along an axis perpendicular to the longitudinal axis, and causing the texture to be wound under tension onto a mandrel. The texture includes a portion presenting extra thickness. During the winding of the texture, a spacer element is interposed between adjacent turns of the fiber texture onto the mandrel. Each spacer element extends in the width direction of the texture over a portion thereof situated outside the portion of extra thickness and presenting, over the portion of the texture situated outside the portion of extra thickness, a thickness that corresponds at least to the difference between thicknesses of the portion of extra thickness and of the portion of the texture situated outside the portion of extra thickness.

Abstract: A method of fabricating a textile structure of varying thickness, the method including weaving a fiber texture in the form of a strip and winding the fiber texture under tension onto a mandrel, the fiber texture including a greater-thickness portion presenting greater thickness. During winding of the fiber texture on the mandrel, an interleaving element is interposed between adjacent turns of the fiber texture on the mandrel, the interleaving element extending in the width direction of the fiber texture over a portion of the texture that lies outside the greater-thickness portion. The interleaving element presents, over the portion of the texture situated outside the greater-thickness portion, a thickness that corresponds at least to the difference between the thickness of the greater-thickness portion and the thickness of the portion of the texture situated outside the greater-thickness portion.