Polystyrene foam filling method for composite material honeycomb sandwich structure

Abstract

The invention relates to a polystyrene foam filling method for a composite material honeycomb sandwich structure. The polystyrene foam filling method comprises the following steps of paving a layer of strip-shaped polystyrene foam on the die-attaching side of a honeycomb core, heating and extruding the strip-shaped polystyrene foam into a filling cavity of the honeycomb core, and paving a single-layer isolating membrane between the honeycomb core and a die; filling the non-die-attaching side of the honeycomb core with powdery polystyrene foam, and laying multiple layers of isolating membranes; and putting a forming die into curing forming equipment for heating and curing the polystyrene foam. According to the polystyrene foam filling method for the composite material honeycomb sandwich structure, residual stress generated by curing shrinkage of the polystyrene foam due to the fact that a composite material honeycomb sandwich structure workpiece is subjected to the procedures of pre-bonding and foaming in sequence, only the foaming face on one side is bound, and the other side is not bound can be eliminated; air wrapping in the filling cavity of the honeycomb core in the polystyrene foam filling process is avoided, and the filling quality and efficiency are improved; and the honeycomb core is independently formed, a pre-bonding process is cancelled, and the manufacturing cost of the composite material honeycomb sandwich structure is reduced.

Description

technical field [0001] The invention relates to the technical field of composite material manufacturing, in particular to a foam filling method for a composite material honeycomb sandwich structure. Background technique [0002] Composite honeycomb sandwich structure is a structural form with high specific stiffness performance, which is widely used in aerospace vehicle structures. In the honeycomb sandwich structure of composite materials, it is often necessary to fill the honeycomb core of the nail area with foam glue for assembly requirements. The traditional molding process usually adopts the pre-adhesion of the cured outer skin and the honeycomb core, and then fills the honeycomb core with foam glue to cure the foam glue, and finally glues it to the inner skin. Since the outer skin is pre-bonded with the honeycomb, the structural asymmetry will cause the part to bend toward the pre-bonded honeycomb side, and the deformation will often be corrected during the bonding pr...

AI Technical Summary

Problems solved by technology

And in the traditional process, after pre-bonding, one side of the honeycomb core filling cavity is closed by the outer skin, and the air in the honeycomb core filling cavity is trapped in the process of filling the foaming glue, which makes it difficult for the foaming glue to be completely filled, and during the foaming process , the volume of the wrapped gas increases with the rise of temperature, causing the foam to overflow from the filling cavity of the honeycomb core

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