| 摘要 |
Process for manufacturing a composite block of closed geometry, in the form of a continuous ring, based on reinforcing fibres and on a cross-linkable resin, by continuously winding in superposition a predetermined number Nc of layers of a tape of the reinforcing fibres embedded in a matrix based on a composition comprising the cross-linkable resin, the method comprising, from the upstream end downstream, the steps of: producing a rectilinear arrangement (12) of reinforcing fibres (11), and conveying this arrangement in a feed direction (F); degassing the arrangement of fibres (12) under the action of a vacuum (13); after degassing, impregnating the arrangement of fibres (12) with the resin composition in the liquid state (17); passing the pre-preg thus obtained through a die (20) to impose on the per-preg the shape of a tape (21) consisting of the reinforcing fibres (11) in their liquid resin matrix (17), the thickness (Er) of the tape being between 0.1 mm and 0.5 mm; on leaving the die (20), applying a surface treatment (22) to the upper face of the tape (21) in order to create a solid skin the thickness (Ep) of which represents less than 10% of the thickness (Er) of the tape, so that the skin acts as a stable base for the subsequent winding of the tape (21) on itself; depositing the thus superficially treated tape (21) on a support (23) that dictates the final shape of the composite block, and winding the tape (21) onto the support (23), in a single direction, by superposing the number Nc of layers in order directly to form the continuous ring (30) on the support (23), Nc being less than 15.
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