Brief description of embodiments of a textile preform for multidirectional, a device for its implementation and the resulting preform for

摘要

- the object of the invention is a method of implementation of a textile preform multidirectional, in which there is deposited on a substrate which is adapted to the stitching (m), a first layer of portions of thread, and then, optionally, one or more other layers of different directions, so as to produce a sequence of deposition, and then, at one or more other sequences of deposition of layers, each segment of yarn (31, 32, 33) being, at each end, fixed by stitching, without knotting in the said substrate (m) with the aid of a needle (11, 12), characterized in that the connection to the two ends of each section (31, 32, 33) is carried out independently with the aid of two needles (11, 12) using different wires (p1, p2) of that of the plies, the end of the length of wire being, as soon as the arrival of the deposition head at the level of its point of regression, fixed by the stitching thread, the stitching needle inserted acting as a point of attachment of the wire during the deposition of the following segment, the needle remains inserted at least as far as the penetration of the stitching needle of the other end of said section following. - application to the production of composite parts