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A multi-needle weaving method for a prefabricated body whose internal and external contours are convex polygons

A convex polygon, preform technology, applied in knitting, warp knitting, textile and papermaking, etc., can solve the problems of XY direction fiber damage, difficulty in weaving hollow preforms, etc., and achieve high weaving efficiency, neat edges, and forming process. simple effect

Active Publication Date: 2020-11-24
BEIJING NAT INNOVATION INST OF LIGHTWEIGHT LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to realize the weaving of the hollow preform by the fine weaving and piercing process, and at the same time, it is easy to cause damage to the fibers in the XY direction

Method used

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  • A multi-needle weaving method for a prefabricated body whose internal and external contours are convex polygons
  • A multi-needle weaving method for a prefabricated body whose internal and external contours are convex polygons
  • A multi-needle weaving method for a prefabricated body whose internal and external contours are convex polygons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: The inner and outer edges of the cross-section of the three-dimensional prefabricated body are regular octagonal, and the X-direction yarn and Y-direction yarn are 3K carbon fibers. The Z guide array is made of stainless steel with a diameter of 2mm and a center distance of 4mm. The elastic side rod is made of carbon fiber reinforced nylon with a diameter of 0.5mm.

[0037] Specific implementation steps:

[0038] (1) Passing along the X direction through the upper and lower edges of the hollow prefabricated body cross-section whose inner hole is a regular octagonal shape in the Y direction, the prefabricated body cross section is divided into a large concave part Sx1 and a small concave part Sx2;

[0039] (2) passing along the Y direction through the left and right edges of the hollow prefabricated cross-section inner hole of the regular octagonal X-direction whose inner and outer edges are regular octagons, and dividing the prefabricated cross section into ...

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Abstract

The invention discloses a precast multi-needle knitting method with convex polygons inner and outer contours of a cross section, and belongs to the technical field of composite prefab forming. The precast multi-needle knitting method comprises the steps of prefab cross section division, guide array layout, regional weaving, compaction and other processes. The precast multi-needle knitting method has the advantages that the forming process is simple, the operability is strong, and the knitting efficiency is high.

Description

technical field [0001] The invention relates to a multi-needle weaving method for a prefabricated body whose internal and external contours are convex polygons, and belongs to the technical field of composite material prefabricated body forming. The method is mainly used to prepare a three-dimensional prefabricated body of composite material, the forming process is simple, and the forming efficiency can be significantly improved. Background technique [0002] Fiber preforms are used as reinforcement materials to make advanced composite materials. They have been successfully used in high-tech fields such as aviation, aerospace, ships, and rail transit, and have good development prospects. [0003] At present, the fiber preform is mainly realized through the weaving process and the fine weaving and puncturing process. The weaving process controls the movement of the heald frame through the dobby mechanism to form a multi-layer moving shed. More than two weft insertion needles...

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): D04B21/20D04B21/16D04B21/14
CPCD04B21/14D04B21/16D04B21/20D10B2101/12D10B2101/20D10B2331/02D10B2403/033D10B2505/02
Inventor 刘丰单忠德张群孙正李志坤
Owner BEIJING NAT INNOVATION INST OF LIGHTWEIGHT LTD