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Preform for forming grid reinforced foam sandwich composite material and forming method thereof

A technology for reinforcing foam and foam core material, applied in the direction of weight reduction, etc., can solve the problems of high manufacturing cost and unsuitable for industrial application, etc.

Active Publication Date: 2021-04-20
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to public reports, Kingston University in the United Kingdom and Tarbiat Modares University in Iran have adopted the VARTM (vacuum assisted resin transfer molding) molding process. Foam sandwich composites reinforced with grid structures of different shapes have been successfully prepared, but the description of the molding process in its public reports is extremely simple, and technical details such as mold design and process schemes have not been disclosed; in addition, composite materials based on the VARTM molding process, especially The manufacturing cost of large-scale composite structures is relatively high, which is not suitable for industrial applications

Method used

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  • Preform for forming grid reinforced foam sandwich composite material and forming method thereof
  • Preform for forming grid reinforced foam sandwich composite material and forming method thereof
  • Preform for forming grid reinforced foam sandwich composite material and forming method thereof

Examples

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preparation example Construction

[0059] The preparation of the preform relies on the flat-plate auxiliary mold, including the laying of the upper panel 5 and the lower panel 6, the laying of the foam core strip 7, the dry fiber fabric 8 (the composite material grid after being infiltrated with resin structure) laying, etc. Wherein, the thickness of the lower panel 6 is the same as that of the silica gel gasket 4, and it is laid on the metal base plate 1 at a position between the two fence-like structures, and above the lower panel 6, staggered foam core strips 7 and stems are arranged. state fiber fabric8.

[0060] A method for forming a grid-reinforced foam sandwich composite material, comprising the following steps:

[0061] (1) Metal base plate 1 preparation

[0062] The metal bottom plate 1 is placed flat on the horizontal operating table, and then the upper surface and the slot of the metal bottom plate 1 are cleaned with alcohol or acetone. Apply evenly 3 times with an interval of 10-20 minutes betwe...

Embodiment 1

[0090] combined with Figure 7 and 8 , the shape of the longitudinal section of the positioning block in the grid-reinforced foam sandwich composite material in this embodiment is rectangular. Among them, the number of positioning blocks with a rectangular longitudinal section is 12 pairs of 24, with a length of 40 mm, a width of 15 mm, and a height of 28.5 mm. The distance between adjacent positioning blocks is 40.8 mm. The model of the fastening bolt is M8, and the length of the metal base plate is 1150mm, the width is 1150mm, and the thickness is 20mm.

[0091] The length of the upper panel and the lower panel is 929mm, the width is 920mm, and the thickness is 3.5mm. The width of the dry fiber fabric in the grid structure is 950mm, and the thickness is 0.4mm. The number of foam core strips with a longitudinal section is 23, and the length is 950mm. (11 pieces) and 920mm (12 pieces), with a width of 40mm and a height of 25mm.

[0092] The metal bottom plate and positionin...

Embodiment 2

[0096] combined with Figure 9 and 10 , the shape of the longitudinal section of the positioning block in the grid-reinforced foam sandwich composite material of this embodiment is an isosceles trapezoid. Among them, the number of positioning blocks whose longitudinal section is isosceles trapezoidal is 15 pairs and 30, the upper bottom is 20mm, the lower bottom is 66.2mm, the width is 20mm, and the height is 42.6mm. 20mm, 2.6mm thick, the locking bolt model is M10, the metal bottom plate is 1500mm long, 1300mm wide, and 25mm thick.

[0097] The length of the upper panel is 1233mm, the length of the lower panel is 1279mm, the width of the upper panel and the lower panel is 1030mm, and the thickness is 2.6mm. The grid structure is 1070mm wide and 0.21mm thick. There are 29 pieces, 1070mm long (14 pieces) and 1030mm (15 pieces), two types, the upper bottom is 20mm, the lower bottom is 66.2mm, and the height is 40mm.

[0098] Metal bottom plate and positioning block are made o...

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Abstract

The invention discloses a preform for forming a grid reinforced foam sandwich composite material and a forming method thereof. The preform can conveniently and quickly finish staggered interpenetration compounding of a discrete foam core material and dry fiber fabric, and can ensure the dimensional accuracy, the overall stability and the quality consistency of a finished composite material. The forming process is simple in method, convenient to operate and low in cost, integral forming of a large-size grid reinforced foam sandwich composite material with the size not smaller than 1m*1m can be achieved, and the novel composite material sandwich structure can partially replace an existing composite material sandwich structure, can be widely applied to the fields of rail transit, high-speed trains, aerospace, ships, ocean engineering and the like.

Description

technical field [0001] The invention relates to the technical field of sandwich structure composite materials, in particular to a preform for molding grid-reinforced foam sandwich composite materials and a molding method thereof. Background technique [0002] Traditional foam sandwich composite materials are composed of upper and lower composite material panels with high strength and modulus and low-density foam sandwich materials between the upper and lower panels, which have high specific strength and specific stiffness; at the same time, low density The foam sandwich material has the functions of fire prevention, heat insulation, sound insulation and energy absorption. Therefore, the traditional foam sandwich composite material has become a typical structural and functional integration material, which has been widely used in rail transit, high-speed trains, aerospace, ships and ocean engineering and other fields. However, with the continuous improvement of structural per...

Claims

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Application Information

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IPC IPC(8): B29B11/16B29B11/06B29C70/34
CPCY02T50/40
Inventor 朱俊崔进桂林罗浩
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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