Method for weaving 2.5D angle-interlock preformed part with section gradually decreasing

[0028] Example 1:

[0029] Adopt the trapezoidal body component (referring to of the inventive method weaving) Image 6 ). The cross-sectional size of its large end is 100mm×1.5mm (width×thickness), the trapezoid height is 100mm, the warp yarn density is 10 yarns/cm, the weft yarn density is 8 yarns/cm, the warp and weft yarns are carbon fiber T300-3K, and the reed used is 10 teeth/cm. According to the size requirements and density of the workpiece, the number of warp yarns required is 500, and the length of the warp yarns must be at least greater than 100mm.

[0030] Warp yarn 5 is passed through reed 4 according to the requirement of warp density, and is suspended on the yarn hanging point 9 on the machine chassis 7 . The up and down reciprocating motion of the machine chassis 7 drives the warp yarn 5 to reciprocate up and down, and 6 or 4 channels are formed between the warp yarns 5 during the up and down reciprocating process. At this time, the weft yarn 3 is passed through the channels in turn and left therein. Finally, promote steel reed 4 to tighten weft yarn 3, reach the designed weft yarn density.

[0031] design figure 2 Shown is a schematic diagram of the fabric structure used in this embodiment, which is a layer-layer orthogonal angle interlocking structure, but the weaving method of the present invention is not limited to a certain angle interlocking structure, and is suitable for fabrics including through-thickness bias angle interlocking fabrics , P layer bias angle interlocking fabric, through-thickness bias angle interlocking fabric with weft insertion, P layer bias angle interlocking fabric with weft insertion, P layer orthogonal angle interlocking fabric, P layer orthogonal with weft insertion Any of the corner interlocking fabrics, etc. (see Yang Caiyun et al., Structural Design and New Weaving Technology of 3D Angle Interlocking Structure Prefabricated Parts for Composite Materials [J]. Journal of Donghua University, 2005, 31(5): 53 -58.).

[0032] Repeat the above operations until reaching the part where the cross-section of the workpiece changes. like image 3 As shown, the subtraction operation is performed on the yarn at the yarn reduction point I, and then the yarn transfer operation is performed on the yarn at the yarn transfer point II to the yarn hanging point at the same position in the adjacent column as shown Figure 4 As shown, the operation of changing the reed 10 is carried out to the moved yarn simultaneously, as Figure 5 As shown, the same row or multiple rows of warp yarns are located between the same reed teeth to ensure that the warp density of the workpiece remains unchanged. Repeat the above operations according to the section change design, and complete the yarn reduction and yarn transfer operations of all yarn reduction points this time. The positions of the yarn reduction points are shown in Table 1.

[0033] Table 1 The position of the yarn reduction point of the workpiece in this embodiment

[0034]

[0035] Carry out corresponding yarn reduction, yarn transfer, and weft insertion operations according to the designed yarn reduction point positions until all yarn reduction points are completed and the design length of the part is reached, and the designed trapezoidal body part is obtained.