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Method and preform for reducing yarn reduction gradient of variable-thickness three-dimensional woven preform

A prefabricated, thickness-variable technology, applied in textiles, papermaking, textiles, fabrics, etc., can solve problems such as reducing the mechanical properties of composite materials, avoid molding quality problems, improve profiling accuracy, and reduce yarn gradients.

Active Publication Date: 2022-03-22
NANJING FIBERGLASS RES & DESIGN INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the steps formed by yarn reduction will form resin-rich areas, which will bring local defects, thereby reducing the mechanical properties of composite materials

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Method and preform for reducing yarn reduction gradient of variable-thickness three-dimensional woven preform
  • Method and preform for reducing yarn reduction gradient of variable-thickness three-dimensional woven preform
  • Method and preform for reducing yarn reduction gradient of variable-thickness three-dimensional woven preform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This example is a method for reducing the yarn reduction gradient of the preform with variable thickness along the warp direction, such as figure 1 As shown, the main body of a variable-thickness prefabricated body 1 in this example is composed of warp and weft yarns, in which a1-a4 is the warp system, e11-e155 is the weft system, and the direction from a1 to a4 is the thickness direction, and e11 The direction e151 is the warp direction, and the direction perpendicular to the warp direction and the thickness direction is the weft direction. Along the warp direction, the first layer at the variable thickness section of n1 starts to be drawn out, that is, e41~e151 is drawn out and no longer participates in weaving. In the prior art, the warp yarn a1 is usually also drawn out at the section n1, in order to reduce the gradient of thickness variation , the present invention temporarily retains a1 while continuing to weave and keep consistent with the movement of the adjacen...

Embodiment 2

[0032] This example is a method for reducing the yarn reduction gradient of the variable thickness preform along the weft direction, such as image 3 As shown, the main body of a variable-thickness prefabricated body 3 in this example is composed of warp and weft yarns, wherein a11-a155 is the warp system, e1-e4 is the weft system, and the direction from e1 to e4 is the thickness direction, and a11 The direction a151 is the weft direction, and the direction perpendicular to the weft direction and the thickness direction is the warp direction. Along the weft direction, the first layer of warp yarns at the variable thickness section n5 starts to be drawn out, that is, a41~a151 are drawn out and no longer participate in weaving. In the prior art, the weft yarn e1 is usually drawn out at the section n5, in order to reduce the gradient of thickness variation , the present invention temporarily retains e1 while continuing to weave and keeps consistent with the motion of the adjacent...

Embodiment 3

[0034] This example is a method for reducing the yarn reduction gradient of the laminated variable-thickness preform, such as Figure 5 As shown, part 8 is a variable-thickness prefabricated body, which is formed by stacking three single-layer prefabricated bodies 5 to 7. In the prior art, the three single-layer variable-thickness prefabricated bodies usually have the same yarn reduction position, that is, they are all at the sections n9 and n12 and n15, in order to avoid the concentration of yarn reduction points and the large gradient of thickness change, the present invention redistributes the yarn reduction points of the three-layer prefabricated body, and the yarn reduction points are distributed along the direction of variable thickness, and the yarn reduction positions of the single-layer preform 5 are respectively n9 , n12 and n15, the yarn reduction positions of the single-layer preform 6 are respectively n10, n13 and n16, and the yarn reduction positions of the single...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention discloses a method for reducing the yarn reduction gradient of a variable-thickness three-dimensional woven prefabricated body and the prefabricated body. The method includes drawing out at least one layer of weft yarn at the 2n-1th variable-thickness section from the largest part of the prefabricated body thickness, The warp yarn of the layer corresponding to at least one layer of weft yarn extracted is temporarily reserved, and the movement path of the temporarily reserved warp yarn is changed. The warp yarn of the corresponding layer is drawn out at the variable thickness section, and the warp yarn or weft yarn drawn out at the variable thickness section is interrupted from the variable thickness section, n≥1. According to the direction of gradually decreasing thickness of the prefabricated body, at least one layer of warp yarn or weft yarn is drawn from each variable thickness section than the previous variable thickness section. The present invention realizes the reduction of the yarn reduction gradient of the variable-thickness three-dimensional woven prefabricated body, avoids the large gradient formed by reducing the warp and weft yarns at the same time, and avoids the problem of molding quality caused by affecting the resin flow.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional woven composite materials, and in particular relates to a method for reducing the yarn reduction gradient of a variable-thickness three-dimensional woven prefabricated body and the prefabricated body. Background technique [0002] The three-dimensional woven structure prefabricated body has good structural integrity due to the interweaving of yarns in three-dimensional space. It is often used in composite material reinforced structures, and its application and development in aviation, aerospace and other fields are becoming more and more rapid. In practical engineering applications, some composite parts are shaped with variable thickness, such as the thickness gradually decreases along the length or width direction. In order to realize the net size profiling design, the yarn reduction method is often used to realize the thickness change. [0003] Before and after yarn reduction of the pr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D03D25/00
CPCD03D25/005
Inventor 周海丽李超孙方方韩晨晨张立泉
Owner NANJING FIBERGLASS RES & DESIGN INST CO LTD
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