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Grid-reinforced foam sandwich composite material preform and its forming method

A technology for enhancing foam and foam core materials, applied in the direction of weight reduction, etc., can solve the problems of high manufacturing cost and unsuitability for industrial applications, and achieve the effects of low manufacturing cost, improved convenience of loading and unloading, and easy assembly

Active Publication Date: 2022-07-08
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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  • Grid-reinforced foam sandwich composite material preform and its forming method
  • Grid-reinforced foam sandwich composite material preform and its forming method
  • Grid-reinforced foam sandwich composite material preform and its forming method

Examples

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Effect test

preparation example Construction

[0059] The preparation of the preform relies on the flat 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 (after resin infiltration molding is the composite grid). structure), etc. The thickness of the lower panel 6 is the same as that of the silicone gasket 4, which 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 drywalls are arranged. State fiber fabric 8.

[0060] The forming method of the lattice reinforced foam sandwich composite material comprises the following steps:

[0061] (1) Preparation of metal base plate 1

[0062] The metal base plate 1 is placed flat on a horizontal operating table. After that, use alcohol or acetone to clean the upper surface and the card slot of the metal base plate 1. After cleaning and drying, apply mold release wax to the upper surface and the card...

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 a rectangle. Among them, the number of positioning blocks with rectangular longitudinal section is 12 pairs of 24, the length is 40mm, the width is 15mm, and the height is 28.5mm. The adjacent spacing between the positioning blocks is 40.8mm. The type of tightening bolt is M8, and the metal base plate is 1150mm long, 1150mm wide and 20mm thick.

[0091] The upper and lower panels are 929mm long, 920mm wide and 3.5mm thick, the dry fiber fabric in the grid structure is 950mm wide and 0.4mm thick, and the number of foam core strips with a rectangular longitudinal section is 23, with a length of 950mm (11) and 920mm (12) two kinds, width 40mm, height 25mm.

[0092] The metal base plate and positioning block are made of 6061 aluminum alloy, and the locking bolts are made of 12.9 grade high-strength st...

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 in this embodiment is an isosceles trapezoid. Among them, the number of positioning blocks whose longitudinal section is an isosceles trapezoid is 15 pairs of 30, the upper bottom is 20 mm, the lower bottom is 66.2 mm, the width is 20 mm, and the height is 42.6 mm. 20mm, thickness 2.6mm, locking bolt type is M10, metal base 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 are both 1030mm, and the thickness is 2.6mm. There are 29 pieces, 1070mm long (14 pieces) and 1030mm (15 pieces), the upper base is 20mm, the lower base is 66.2mm, and the height is 40mm.

[0098] The metal base plate and positioning block are made of 45# steel, and the locking bolts are made of 42# chrome-manga...

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Abstract

A preform for forming a lattice-reinforced foam sandwich composite material and a forming method thereof. The preform can conveniently and quickly complete the interleaved composite of the discrete foam core material and the dry fiber fabric, and can ensure the dimensional accuracy, overall stability and quality consistency of the finished composite material. The molding process itself is simple in method, convenient in operation, and low in cost, and can realize the integral molding of large-sized grid-reinforced foam sandwich composite materials of not less than 1m*1m. The new composite material sandwich structure can partially replace the existing composite material sandwich structure. , can be widely used in rail transportation, high-speed trains, aerospace, shipbuilding and marine engineering and other fields.

Description

technical field [0001] The invention relates to the technical field of sandwich structure composite materials, in particular to a preform for forming a lattice reinforced foam sandwich composite material and a forming method thereof. Background technique [0002] The traditional foam sandwich composite material is composed of upper and lower composite material panels with high strength and modulus and a low-density foam sandwich material between the upper and lower panels, which has 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 integrated material, and has been widely used in rail transit, high-speed trains, aerospace, shipbuilding and marine engineering and other fields. However, with the continuous improvement of str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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