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A kind of suture method of composite material

A composite material and stitching needle technology, which is applied in the field of composite material stitching and pre-formed composite material processing, can solve the problems of high cost and lack of versatility of the stitching platform, and can prevent thread breakage, facilitate transfer, and reduce needle drop. Effect

Active Publication Date: 2021-08-03
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the lack of versatility and high cost of the existing sewing platform in the seam, the present invention provides a sewing method for composite materials that can sew different parts, improve the quality of sewing, and reduce costs

Method used

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  • A kind of suture method of composite material
  • A kind of suture method of composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] See figure 2 , a kind of sewing method of composite material of the present invention, the steps are:

[0021] S1 Fix the PMI foam pad under the composite parts that need to be stitched;

[0022] S2 Set a plastic film between the composite material part and the PMI foam pad;

[0023] S3 uses the thread hole to be set at the tip of the sewing needle and the suture passes through the composite material and then plunges into the PMI foam;

[0024] S4 Lift the sewing needle so that the suture remains in the composite part and PMI foam;

[0025] S5 Repeat steps S3 and S4 until the stitching is completed.

Embodiment 2

[0027] See figure 2 , a method for improving stitching quality, comprising composite material parts 1, sutures 2, sewing needles 3, plastic film 4, arranging PMI foam pads 5 on a table top 6, and using double-sided between the table top 6 and the PMI foam pad 5 Tape bonding; PMI foam pad 5 thickness is greater than or equal to 30mm, and area is less than or equal to the area of ​​table top 6; PMI foam pad 2 can be replaced according to the size of the stitched parts, the number of times of use, etc.; stick the plastic film 4 around the PMI foam pad 5 with tape When sewing, the composite material part 1 is placed on the plastic film 4, and the sewing needle 3 passes through the sewing part with the suture 2, and then passes through the plastic film 4 and then plunges into the PMI foam pad 5, because the sewing needle 3. It can move up and down freely in the PMI foam, and at the same time, the suture is retained by the friction of the PMI foam, and there is no need to design a ...

Embodiment 3

[0029] The present invention is a method for improving the sewing quality. During the sewing work, the composite material part 1 is placed on the plastic film 4, and when the sewing needle 3 moves downward, after passing through the composite material part 1 with the suture 2, the sewing The needle 3 carries the suture 2 through the plastic film 4 and then plunges into the PMI foam pad 5. The friction between the needle 3 and the PMI foam makes the suture 2 stay in the PMI foam pad 5; the suture 2 is covered by the PMI foam. Pad 5 bites, and like this suture thread 2 just is difficult to leave composite material part 1 with the upward movement of suture needle 3 again, has avoided the occurrence of the needle dropping problem, has improved suturing quality. After the composite material part 1 is stitched, the adhesive tape for pasting the plastic film 4 and the PMI foam pad 5 is peeled off, and the plastic film 4 and the composite material part 1 are taken off from the PMI foam...

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Abstract

The invention provides a composite material suture method, the steps are: S1 fixedly arrange a PMI foam pad under the composite material part to be sewed; S2 arrange a plastic film between the composite material part and the PMI foam pad; S3 use thread holes The suture needle band suture that is arranged at the tip passes through the composite material part and then plunges into the PMI foam; S4 lifts the suture needle so that the suture remains in the composite material part and the PMI foam; S5 repeats steps S3 and S4 until suture Finish. The PMI foam pad of the present invention can be replaced according to the size of the workpiece and the number of times of use, which is flexible and quick; it is convenient to transfer and prevent off-line by lining the plastic film; it adopts the foam table top and plastic film, and there is no need to set the sinking or setting on the table according to the sewing track. Hollowing can be used for sewing different parts, which improves the versatility and reduces the manufacturing cost; increases the friction of the sewing needle during sewing, so that the suture can stay inside the part better, improves the sewing quality, and reduces the Needle drop situation improves efficiency.

Description

technical field [0001] The invention relates to the field of processing preformed composite materials, in particular to the technical field of seam-stitching of composite materials. Background technique [0002] The suture technology is a technology that uses sutures to form two-dimensional fabrics into quasi-three-dimensional fabrics or to connect fabrics into an overall structure. Seamed fabric reinforced composites have excellent interlayer properties, impact damage tolerance and low cost, and are currently highly valued by the aerospace community at home and abroad. Composite seams are an important seaming method and are widely used. Lin-sewing is a single-needle and single-thread sewing method. During the sewing process, the suture is left inside the sewing part by the friction between the sewing needle and the sewing part, and no knots are left inside the part. Minor damage, but sutures come apart easily, see figure 1 . Since the sewing needle will penetrate the en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C65/62
CPCB29C65/62
Inventor 杨龙英黄当明刘兰余宁
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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