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Novel method for molding resin base composite material by sewing/resin film infusion

A composite material and resin film technology, which is applied in the field of composite material manufacturing, can solve problems such as complex resin flow channel design, inconsistent permeability of preforms, and incomplete penetration

Active Publication Date: 2014-07-09
AVIC COMPOSITES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing resin film infiltration method, since the resin required for the parts is uniformly placed on the bottom layer of the entire preform, the resin infiltration process is greatly affected by the permeability and structural factors of each part of the preform, and the composite film using stitching technology The material is usually a reinforced panel structure with a complex structure. The permeability of the fiber preform in the stitched area and the non-stitched area is also inconsistent. Incomplete penetration due to inconsistent regional resin penetration rates

Method used

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  • Novel method for molding resin base composite material by sewing/resin film infusion
  • Novel method for molding resin base composite material by sewing/resin film infusion
  • Novel method for molding resin base composite material by sewing/resin film infusion

Examples

Experimental program
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Effect test

Embodiment 1

[0165] Example 1: figure 1The typical part of the hat-shaped reinforced wall panel is shown, the outer dimension of the wall panel is 1500mm×800mm, there are 4 hat-shaped ribs 7 on the skin 6, the material is U7192 / QY9512, 24 layers of skin, 16 layers of reinforcement, The fiber volume content is required to be 60%. The surface density of U7192 carbon fiber fabric is 195g / m 2 , U7192 carbon fiber fabric adopts T700 fiber density 1.81g / cm 3 , QY9512 resin density 1.24g / cm 3 . The flange of the cap-shaped reinforcement 7 and the skin 6 are joined together by suture technology. figure 2 The sewing area 8 of the part is stitched and integrally formed by the RFI process. The process steps are as follows:

[0166] a. Analyze the composition of typical parts, which are divided into 6 ply units for skin and 7 ply units for reinforcement. The skin 6 layer unit and the reinforcement 7 layer unit are divided into stitched and non-sewn areas respectively, and the skin stitched are...

Embodiment 2

[0213] Embodiment 2: as Figure 7 The hat-shaped reinforced wallboard structure is shown, the outer dimension of the wallboard is 4900mm×900mm, the skin 6 is flat in shape, and there are 4 hat-shaped reinforcements 7 with a total of 20 sections and two different cross-sectional sizes. The material is U7192 / QY9512, with 20 layers of skin and 10 layers of reinforcement, requiring a fiber volume content of 56%. The surface density of U7192 carbon fiber fabric is 195g / m 2 , U7192 carbon fiber fabric adopts T700 fiber density 1.81g / cm 3 , toughened QY9512 resin density 1.24g / cm 3 . In order to improve the structural integrity, the hat-shaped reinforced flange and the skin are bonded together by suture technology. Figure 8 The stitched area 8 shown is stitched, the remaining areas require interlaminar toughening and integral molding using the RFI process. The process steps are as follows:

[0214] a. The wall panels are divided into skin 6-ply units and reinforcement 7-ply un...

Embodiment 3

[0261] Embodiment 3: as Figure 12 In the "J" reinforced panel structure shown, the skin 14 has five "J" shaped reinforcements 15. The material is U3160 / QY9512, the skin is of variable thickness, 22 layers of full lay-up, 6 layers of intercalation in the thickening area 16, and a total of 16 layers of equal thickness for reinforcement, requiring a fiber volume content of 58%. The surface density of U3160 carbon fiber fabric is 160g / m 2 , U3160 carbon fiber fabric adopts T300 fiber density 1.76g / cm 3 , toughened QY9512 resin density 1.24g / cm 3 . In order to improve the interface strength between the reinforcement and the skin, the stitching technology is used to suture the seam area 8 of the lower flange on both sides of the "J" type reinforcement and the skin 14, and the rest of the area requires interlayer toughening, and RFI technology is required For integral molding. We have adopted technical solution of the present invention, and concrete process step is as follows: ...

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Abstract

The invention belongs to a resin base composite material liquid molding technology and relates to a novel method for molding a resin base composite material by sewing / resin film infusion (RFI). According to the novel method, a resin film is arranged between fabric paving layers of a non-sewing region of a fiber enhanced pre-molded body; a resin film is arranged on the upper part of a sewing region. According to the novel method, a traditional manner of a single resin film in a traditional resin film infusion molding process is changed and different resin arranging manners are adopted aiming at the sewing region and the non-sewing region of a sewing structure so as to meet the requirements on a sewing process of the sewing region and conveniently carry out resin flow control of an RFI process; the novel method is good for sewing / RFI molding of a complicated structure and the RFI molding of more structures, even non-opening structures can be realized; the process stability is improved and the requirements on engineering production are adapted.

Description

technical field [0001] The invention belongs to the technical field of composite material manufacturing, and relates to a method for forming a resin-based composite material by a novel suture / resin film infiltration, or RFI (Resin Film Infusion, RFI for short). Background technique [0002] Advanced composite materials have become one of the main materials of modern aircraft structures because of their advantages such as specific strength, high specific stiffness and designability. However, with the continuous expansion of the amount of composite materials, the weaknesses of weak interlayer performance and high manufacturing costs have become more prominent, which limits the application of composite materials to some extent. In recent years, in order to improve the interlayer performance of composite materials, many research institutions at home and abroad are researching the three-dimensional reinforcement technology of composite materials and the corresponding liquid formi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/38
CPCB29C70/38
Inventor 高艳秋赵龙
Owner AVIC COMPOSITES
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