Special-shaped curved surface quasi-triaxial fabric, knitting process method thereof and application of fabric

Abstract

The invention discloses a special-shaped curved surface quasi-triaxial fabric, a knitting process method thereof and an application of the fabric. The method includes the steps: 1) designing and manufacturing a core mold with a hollow structure according to the appearance of the fabric and forming a plurality of needle holes in the core mold; 2) threading normal fibers at the tails of steel needles, enabling the tip of each steel needle to penetrate one needle hole outwards from the inside of the core mold and retaining the tails in the needle holes; 3) winding warp-wise fibers and weft-wise fibers in gaps of the steel needles on the outer surface of the core mold, and knitting warp-wise and weft-wise fiber layers; 4) pulling out the steel needles one by one, reserving the normal fibers inthe fiber layers, pressing the fiber layers by a prepressing tool and releasing the mold to obtain the special-shaped curved surface quasi-triaxial fabric when the warp-wise fibers and the weft-wisefibers reach specified thickness distribution. The thickness of each needle hole is equivalent to that of each normal fiber. Damage to the fibers caused by needling and integrated piercing is overcome, and a special-shaped fabric structure achieves good mechanical properties and high reliability.

Description

technical field [0001] The invention relates to a weaving process, in particular to a quasi-three-way fabric with a special-shaped curved surface and its weaving process method and application. Background technique [0002] The radome is a light-weight, high-strength thin shell structure with high temperature resistance and high magnetic wave penetration resistance. The comprehensive performance requirements of heat, electricity, structural strength and stiffness are strict. The inner and outer structures of the radome are special-shaped curved surfaces. The aerodynamic shape is a duckbill-shaped waverider structure. This kind of parts has a negative curvature structure. During the 2.5-dimensional shallow cross-bending weaving process, it is often impossible to attach the film due to the tension of the fibers; moreover, the occupancy rate of steel needles and the damage to the fibers in the weaving process of needle punching and puncture lead to the damage of the braid itsel...

AI Technical Summary

Problems solved by technology

This kind of parts has a negative curvature structure. During the 2.5-dimensional shallow cross-bending weaving process, it is often impossible to attach the film due to the tension of the fibers; moreover, the occupancy rate of steel needles and the damage to the fibers in the weaving process of needle punching and puncturing lead to the damage of the braid itself. Inhomogeneity

During the impregnation process of the above fabrics, due to the influence of the structure, the impregnation is inconsistent, and the density of the cover is not uniform. Even if the physical thickness is consistent, the electrical thickness is often different, resulting in errors in the electrical properties of the radome.

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