Method for producing ring-shaped fibrous structures, in particular for making parts in composite material
AssigneeSociete Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A."
InventorsPierre Olry, Dominique Coupe, Bernard Lecerf, Jean-Michel Guirman
Life of this patent
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Abstract
To make an annular fiber structure, a strip-shaped fabric (50), is used which is made up of two superposed unidirectional sheets, with the directions of the sheets forming opposite angles relative to the longitudinal direction of the strip, the two sheets being bonded together so as to form deformable elementary meshes, the fabric being wound while being deformed so as to transform it into a flat helix, the elementary meshes deforming in such a manner that variation in mass per unit area between the inside and outside diameters of the turns remains small, and the flat turns are pressed against one another.
Claims17
A method of making an annular fiber structure by winding a flat helix of a fiber fabric in the form of a deformable strip, the method steps comprising:
- supplying a fiber fabric in the form of a deformable strip made up of two superposed unidirectional sheets, each constituted by mutually parallel fiber elements, the direction of the fiber elements in one sheet forming angles of opposite signs with respect to the direction of the fiber elements in the other sheet and relative to the longitudinal direction of the strip, and the two sheets being bonded together so as to form deformable elementary meshes;
- deforming the strip-shaped fabric into an helix having turns by modifying the shape of the elementary meshes so that their radial size increases towards the inside diameter of the helix turns, whereby the variation in mass per unit area between the inside and outside diameters of the turns is minimized;
- and
- winding the deformed fabric into a flat helix by applying the deformed turns flat against one another so as to obtain an annular fiber structure whose radial dimension between its inner diameter and outer diameter corresponds to the width of the deformed strip-shaped fabric.
Dependencies are inferred from the claim text.