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Three dimensional knitting method of variable cross section preshaped product and its product

A three-dimensional weaving and pre-forming technology, applied in the field of three-dimensional weaving, can solve the problems of reinforced structure and composite material performance decline, increase the manufacturing cost of pre-formed parts, destroy the integrity of pre-formed parts, etc. Quality and performance, the effect of a simple method

Inactive Publication Date: 2009-05-27
TIANJIN GONGDA AEROTECH COMPOSITE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, such processing will cause serious fiber damage, destroy the integrity of the preformed part, and cause a decline in the performance of the part, thereby reducing the performance of the reinforced structure and composite materials; on the other hand, it also increases the process and improves the Manufacturing costs of preformed parts

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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  • Three dimensional knitting method of variable cross section preshaped product and its product
  • Three dimensional knitting method of variable cross section preshaped product and its product
  • Three dimensional knitting method of variable cross section preshaped product and its product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Adopt the method of the present invention to weave taper sleeve parts (referring to figure 1 ). The inner diameter of the large end is 400mm, the inner diameter of the small end is 100mm, height 700mm, wall thickness 20mm. The diameter cross section of the large end of the tapered sleeve is used as the reference section to start weaving, and the circular braiding method is used for weaving, and the weaving forming direction is along the height direction of the tapered sleeve body. The continuous change of the cross-sectional size of the tapered sleeve body can be approximated by designing the number of yarn reductions and the number of yarn reductions each time along the height direction of the tapered sleeve body according to the principle of uniform fiber volume content. Three-dimensional five-way weaving structure is adopted, the weaving yarn is T700-12k carbon fiber, the weaving angle is 25°, and the fiber volume content is 50%. The number of yarns required fo...

Embodiment 2

[0040] Adopt the screw product of the inventive method braiding M16 (referring to figure 2 ). The cross-section of the nut is used as the reference section for weaving, and the circular weaving method is adopted. The weaving structure is a three-dimensional five-directional weaving structure. The weaving yarn is T700-12k carbon fiber, the braiding angle is 20°, the fiber volume content is 50%, and the number of yarns used for weaving is 520. Normal weaving until the cross-sectional size suddenly changes from the nut to the screw, that is, at the joint between the nut and the screw, according to the size requirements before and after the cross-section change, after reducing 230 yarns at a time, the normal weaving of the screw ends.

Embodiment 3

[0042] Adopt the inventive method to weave variable section square beam parts (referring to Figure 4 ). The big end of the square beam is used as the datum cross-section for the weaving start. The weaving forming direction is the length direction, and the cross-section change is approximated by multiple yarn reductions. The large-end braided yarn of the square beam is 12,000 pieces of 2400tex high-strength glass fiber, which are arranged in a rectangle on the machine chassis; the square weaving method is adopted, the weaving structure is three-dimensional six-way, the weaving angle is 30°, and the fiber volume content is 55 %; The section change is approximated by 5 times of yarn reduction, 600 yarns are reduced each time, and 150 yarn reduction points are evenly distributed on each yarn reduction section. When braided to the small end of the square beam, the section is 9000 pieces of 2400tex high-strength glass fiber yarn.

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 present invention relates to a three-dimensional knitting method of variable section pre-formed product and its product technique. Said method uses four-step method three-dimensional multidirectional knitting process as basis, and is characterized by that in the knitting process it uses one end face of the pre-formed product as reference, and utilizes the change of pre-formed product section size and movement low of knitting yarn to design number of yarn-reducing points of yarn-increasing points in the section and make the number of yarn-reducing points or yarn-increasing points be uniformly distributed in the section, then utilizes the requirement of fibre volume content to define coarseness of knitting yarn in the yarn-receiving point or yarn-shrinking point position, and adopts the processes of moving, laying, reducing yarn or increasing yarn, partitioning and removing so as to implement said invention.

Description

technical field [0001] The invention relates to a three-dimensional weaving technology for a preformed part of a composite material support body, specifically a three-dimensional weaving method for manufacturing a special-shaped or variable cross-section preformed part of a high-performance composite material support body and its part technology, an international patent The classification number is proposed to be Int.cl 7 .D04C 1 / 00. Background technique [0002] The reinforced structure of the composite material or the shape structure and quality of the support body preform basically determine the performance of the composite material. An important form of high-performance advanced composite reinforced structures is the three-dimensional braided preform prepared by three-dimensional braiding technology. Traditional laminated composite materials adopt the form of laminate structure, and the weak interlayer performance is one of the main reasons for the failure of composite...

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): D04C1/00
Inventor 李嘉禄陈利焦亚男
Owner TIANJIN GONGDA AEROTECH COMPOSITE MATERIALS
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