Method for knitting 3D multi-directional braided fabric in size reduced profile of composite material
A three-dimensional multi-directional, composite material technology is applied in the field of net size profiling and yarn-reduction weaving of three-dimensional multi-directional braids for composite materials, which can solve the problems that have not been seen, and achieve the effect of reducing the cross-sectional area.
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Embodiment 1
[0039] Such as Picture 1-1 As shown, this is a 3D fabric sectional view of a three-dimensional multi-directional braided preform with equal thickness cut along the axial direction. The thickness of the preform is 18mm. The preform is made of 3K carbon fiber. Both use 2 strands, the prefabricated parts have 25 pieces / 10cm in the circumferential direction, and the prefabricated parts have 14.3 pieces / 10cm in the female direction. The cone angle is 8°, and the fiber volume content is required to be between (50±3)%. The weaving structure adopts a three-dimensional five-way weaving structure, and the yarn reduction method is to reduce rows and yarns.
[0040] The weaving method is as follows:
[0041] The first step, according to the prefab ( Picture 1-1 ) size requires processing the braiding mandrel, and fix the braiding mandrel on the braiding machine table with the big end facing up;
[0042] Step 2: According to the requirements, select the three-dimensional five-way weav...
Embodiment 2
[0071] Such as Figure 1-2 As shown, this is a 3D prefabricated section view of a three-dimensional multi-directional braided prefabricated part with equal thickness cut along the axial direction. The thickness of the prefabricated part is 18mm. The prefabricated part is made of 3K carbon fiber. The yarns are made of 2 strands, the big-end circumferential knuckles are 25 / 10cm, the big-end female knuckles are 14.3 / 10cm, the inner diameter of the big-end is 300mm, the height is 700mm, and the semi-cone angle of the prefabricated part is 3° , The fiber volume content is required to be between (50±3)%. The weaving structure all adopts a three-dimensional five-way weaving structure, and the yarn reduction method is layer reduction and yarn reduction.
[0072] The weaving method is as follows:
[0073] The first step, according to the prefab ( Figure 1-2 ) size requires processing the braiding mandrel, and fix the braiding mandrel on the braiding machine table with the big end fa...
Embodiment 3
[0101] Such as Figure 1-3 As shown, this is a 3D fabric sectional view cut along the axial direction of a three-dimensional multi-directional braided preform with equal thickness. The thickness of the preform is 23mm. The preform is made of 3K carbon fiber. Both use 2 strands, the large end of the prefabricated part has 25 pieces / 10cm in the circumferential direction, the large end female has 14.3 pieces / 10cm, the inner diameter of the big end is 300mm, the height is 500mm, and the half cone angle is 6°. The fiber volume content is required to be between (50±3)%. The weaving structure all adopts a three-dimensional five-way weaving structure, and the yarn reduction method is gradually thinning and yarn reduction. The weaving method is as follows:
[0102] The first step, according to the prefab ( Figure 1-3 ) size requires processing the braiding mandrel, and fix the braiding mandrel on the braiding machine table with the big end facing up;
[0103] Step 2: According to t...
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