Foam reinforced sandwich structure with fiber bundle and preparation method using sewing-thermal expansion curing molding

Abstract

The invention discloses a reinforced foam interlayer structure with fiber bundles and a preparation method by adopting sewing-thermal expansion curing molding. according to certain pin length d1, pin pitch d3 and row pitch d2, the fiber bundles are connected up and down and sewed on a preforming body in the depth direction of the preforming body so as to realize that an upper panel, a compressed core material and a lower panel are sewed together; subsequently, at temperature of between 60 and 220 DEG C, foam core expands to produce expansion pressure of between 0.05 and 0.7 MPa; after the foam core is cured for 30 and 300 minutes at expansion pressure, the foam core is cooled and demoulded and the reinforced foam interlayer structure with fiber bundles is obtained.

Description

technical field

[0001] The invention relates to a molding method for making a foam sandwich structure. More specifically, it refers to a method of sewing reinforcement-thermal expansion curing in the thickness direction of the foam sandwich structure, so that the prepared foam sandwich structure has stronger bearing capacity. Background technique

[0002] The foam sandwich structure generally consists of an upper panel 2, a lower panel 3 and a foam core 1a sandwiched therein (see figure 2 shown). The foam sandwich structure has the characteristics of light weight, high rigidity, sound insulation, heat insulation, vibration resistance, etc., and is widely used in aerospace, transportation, construction and other fields. However, due to the low mechanical properties of foam plastics, foam collapse or surface-core peeling are prone to occur when bearing loads, which severely limits the application of foam sandwich structures on main load-bearing components. Contents of the ...

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