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Foam sandwich cap type stiffened wallboard structure and integrated forming method

A technology of a reinforced wall panel and a molding method, which is applied in the field of composite material manufacturing, can solve the problems of easy debonding of the panel and the foam sandwich core, and many molding steps, and achieves the effects of low cost, high efficiency, and reduced manufacturing cycle and cost.

Pending Publication Date: 2021-12-10
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that there are many steps in forming the structure of the foam sandwich cap-shaped reinforced wall plate in the prior art, and the panel and the foam sandwich in the structure are easy to debond. The invention also provides a foam sandwich cap-shaped reinforced wall panel structure without the need for an integrated molding process that requires additional damage to the in-plane performance of the panel, such as stitching and Z-Pin

Method used

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  • Foam sandwich cap type stiffened wallboard structure and integrated forming method
  • Foam sandwich cap type stiffened wallboard structure and integrated forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides a hat-shaped reinforced panel structure with a foam core, which includes an upper skin 2 , a lower skin 1 , a foam core 3 and an R-zone filling core material 4 . like figure 1 As shown, in this embodiment, the shape of the foam sandwich 3 is an isosceles trapezoid, which matches the internal shape of the hat-shaped stiffened wall panel, and is evenly distributed on the surface where the foam sandwich 3 contacts the upper skin 2 There are several criss-cross grooves 6, and at the criss-cross places of these several grooves 6, there are vertical guide holes 5 vertically penetrating through the foam sandwich core 3, and the grooves 6 and guide holes of the foam sandwich core 3 5 is filled with resin to form a resin column, the resin column is parallel to the thickness direction of the foam sandwich 3, and the resin column runs through the upper and lower surfaces of the foam sandwich 3 along the thickness direction of the foam sandwich 3, and the f...

Embodiment 2

[0043] On the basis of Example 1, this example discloses an integrated molding method for a foam-sandwich hat-shaped reinforced wall panel structure, including the following steps:

[0044] Step 1. Groove and hole processing is carried out on the upper surface of the isosceles trapezoidal foam sandwich 3, and several grooves 6 criss-crossing are formed on the upper surface of the foam sandwich 3. At the staggered positions of these several grooves 6 Provide diversion holes 5 vertically penetrating through the upper and lower surfaces of the foam sandwich core 3;

[0045] Step 2, laying the reinforcement material treated with the sizing agent on the molding tool, and pre-pumping to complete the laying of the lower skin 1;

[0046] Step 3: Position and place the slotted and perforated foam core 3 on the laid-up lower skin 1 by means of laser projection, and perform pre-pumping so that the foam core 3 and the lower skin 1 are in good condition fixed;

[0047] Step 4: Lay up the u...

Embodiment 3

[0054] On the basis of Embodiment 2, this embodiment discloses an integrated molding method for a foam sandwich hat-type reinforced wall panel structure. Preferably, the reinforcement material is selected as one of carbon fiber, glass fiber, and aramid fiber. species or several.

[0055] Preferably, the reinforcement material is continuous fiber dry fabric, including one or more of unidirectional fabric, plain weave, twill weave and satin weave.

[0056] Preferably, the main components of the sizing agent used in the molding process are unsaturated polyester, epoxy resin, novolac epoxy resin, bismaleimide phenylmethane, diallyl bisphenol A, polyamide resin, One or several types of carboxyl-terminated liquid nitrile rubber.

[0057] Preferably, the loading method of the sizing agent-loaded fabric is one or more of powder loading, solution loading, and resin film loading methods.

[0058] Preferably, the mass fraction of the sizing agent in the sizing agent-loaded fabric is 3%...

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Abstract

The invention discloses a foam sandwich cap type stiffened wallboard structure and an integrated forming method, and belongs to the technical field of composite material manufacturing. According to the method, a dry fabric, a trapezoidal foam sandwich which is grooved and punched in advance and a one-way filling core material are laid and assembled on a skin female die tool, an assembled prefabricated body is prepared, and then the prefabricated body is subjected to integrated impregnation and curing through a vacuum resin flow guide process; wherein, the interface between the skin and the foam sandwich is completely filled with the impregnated resin, the flow guide holes formed in the foam sandwich are also filled with the resin to form resin columns, and the resin columns evenly distributed in the foam sandwich improve the pressure resistance of the foam sandwich material. Besides, the resin penetrating between the resin columns and the skin and the core material also improves the bonding strength between the skin and the core material. Therefore, the manufacturing period and cost of the cap-shaped stiffened wall plate can be obviously reduced.

Description

technical field [0001] The invention relates to the technical field of composite material manufacturing, in particular to a foam sandwich cap-shaped reinforced wall plate structure and an integrated molding method. Background technique [0002] Composite hat-shaped stiffened wall plate structure is widely used in aeronautical structures due to its good post-buckling load capacity, high specific stiffness, good structural stability, high efficiency of transferring circumferential load, and good weight reduction effect. First choice for tubular structural components such as fuselage sections for large passenger commercial aircraft. However, a narrow and long cavity structure is formed between the conventional hat-shaped rib and the skin. During the molding process, a rubber expansion soft mold is required to provide the molding pressure in the cavity, which often requires a lot of extra time for the manufacture of the soft mold. This virtually increases the manufacturing cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64C1/12B64C1/00B29C70/34B29L31/30
CPCB64C1/12B64C1/00B29C70/342B64C2001/0072B29L2031/3076Y02T50/40
Inventor 罗维何凯杨龙英黄海超
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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