PROCESS FOR PRODUCING A MULTIDIRECTIONAL TEXTILE PREFORM, DEVICE FOR IMPLEMENTING SAME AND PREFORM THUS OBTAINED

摘要

P - The object of the invention is a process for producing a multidirectional textile preform, in which a first ply of sections of thread is deposited on a substrate suitable for stitching (M), then, optionally, one or more several other plies in different directions, so as to carry out a deposition sequence, then, possibly carrying out one or more other sequences of deposition of plies, each section of wire (31, 32, 33) being, at each end, fixed by stitching without knotting in said substrate (M) using a needle (11, 12), characterized in that the stitching at the two ends of each section (31, 32, 33) is carried out independently at 'using two needles (11, 12) using separate threads (P1, P2) from that of the plies, the end of the section of thread being, as soon as the depositing head arrives at its cusp, fixed by the stitching thread, the stitching needle pushed in e acting as a pin for hooking the thread when the next section is removed, the needle remaining inserted at least until the stitching needle is pressed in at the other end of said next section. production of composite parts /P