Composite foam sandwich structure and forming method thereof

A composite material and molding method technology, applied in the field of composite foam sandwich structure and its molding, can solve the problems of easy collapse of foam and poor molding quality, and achieve the effect of improving strength and ensuring molding quality.

Active Publication Date: 2019-11-22
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problems of poor molding quality and easy foam collapse existing in the existing composite foam sandwich structure, the present invention provides a composite foam sandwich structure and its forming method

Method used

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  • Composite foam sandwich structure and forming method thereof
  • Composite foam sandwich structure and forming method thereof
  • Composite foam sandwich structure and forming method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0067] Forming a special-shaped composite foam sandwich cover structure, such as figure 2 with image 3 As shown, it includes the lower panel skin of the flap (the lower foam skin 3), the dimension foam core material 2 and the upper panel skin of the flap (the upper foam skin 1), the lower panel skin of the flap and the described The upper panel skin of the cover adopts 8522 high temperature epoxy prepreg material, and the dimensional foam core material adopts domestic PMI foam core material.

[0068] The specific preparation process of the shaped composite material foam sandwich lid structure is realized through the following steps:

[0069] (1) The prefabricated body of the lower panel skin (lower skin) of the special-shaped composite foam sandwich cover structure is cured and formed:

[0070] Lay 8522 high-temperature epoxy prepreg in the lower mold for forming the lid to obtain the lower panel skin prefabricated body, put the mold into the autoclave, and coat the surfac...

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Abstract

The invention relates to a composite foam sandwich structure and a forming method thereof. The method includes the steps that lower skin prepreg is laid, then curing is conducted, and a lower skin prefabricated part is obtained; a foam core material is divided into multiple blocked foam core materials, then the surface of each blocked foam core material is sequentially wrapped by a layer of adhesive film and a layer of carbon cloth prepreg, vacuum curing is conducted, and multiple foam core material prefabricated parts are obtained; and the surface of each of the foam core material prefabricated parts is wrapped by a layer of adhesive film, the multiple foam core material prefabricated parts wrapped by the adhesive films are spliced, a dimensional foam prefabricated part is obtained and put in the lower skin prefabricated part, then upper skin prepreg is laid on the surface of the dimensional foam prefabricated part, overall co-bonding forming is conducted, and a composite foam sandwich structure is obtained. By means of the method, under the premise that the weight of the product is reduced, the strength of the dimensional foam core material is improved, and the problems that thefoam sandwich structure is likely to be collapsed, and product inner quality defects are caused are solved.

Description

technical field [0001] The invention belongs to the technical molding field of composite materials, and in particular relates to a foam sandwich structure of composite materials and a molding method thereof. Background technique [0002] Composite foam sandwich structure is a typical structural form in many fields. Foam has the functions of impact resistance, weight reduction and dimensionality. For the composite foam sandwich structure, especially the special-shaped composite foam sandwich structure, the traditional process adopts the method of co-curing the foam lower skin, dimensional foam, and foam upper skin, but this method is easy to cause a large area of ​​the foam lower skin Loose defects, while the dimension foam is prone to risk of collapse. [0003] In view of the above problems, it is very necessary to provide a new method for forming a composite foam sandwich structure and a composite foam sandwich structure formed thereby. Contents of the invention [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/34B29C70/70
CPCB29C70/342B29C70/70
Inventor 夏雅男田智立张涛陈磊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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