Method for reinforcing surface stability of core of honeycomb-like porous structure by hot film blowing and breaking method

Abstract

The invention belongs to the technical field of composite materials, and relates to a technological method for reinforcing the surface stability of a core of a honeycomb-like porous structure in the manufacturing process of a honeycomb core sandwich structure in an aerospace craft, and particularly relates to a method for reinforcing the surface stability of the core of a honeycomb-like porous structure by a hot film blowing and breaking method. The method comprises the following steps: before manufacturing the sandwich structure, firstly, sticking an adhesive film on the surface of the honeycomb-like porous structure, breaking pores of the adhesive film by a hot film blowing and breaking method and sticking on the side wall of a honeycomb core hole cell, and then carrying out heating and curing treatment so that the adhesive film forms an adhesive stream and shaped on the wall of the core of the honeycomb-like porous structure. An organic integer is formed on the surface of the honeycomb core by the method, and the intensity and rigidity of the surface of the honeycomb core are reinforced. When the structure is pressed, the pressure can be transferred and dispersed timely, so that the possibility of buckling failure of a partial weak region is reduced, the surface stability of the structure is reinforced effectively, and the integral pressure resistant capability is improved.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a method for enhancing the surface stability of a honeycomb-like porous structure core material used in the manufacturing process of a honeycomb core sandwich structure in an aerospace vehicle, in particular to a hot film blowing method A method for enhancing the surface stability of a core material with a honeycomb-like structure. Background technique [0002] With the wide application of composite materials in military and civil fields such as aviation and aerospace, the honeycomb sandwich structure is characterized by its unique light weight, high specific strength and rigidity, excellent fatigue resistance, impact resistance and strong designability, and sound insulation. It is favored for its excellent characteristics such as good thermal insulation effect, etc. Its structure has gradually been applied to various parts with complex shapes from the original flat C s...

AI Technical Summary

Problems solved by technology

[0007] 1. Greatly increase the overall weight of the honeycomb sandwich structure: this process must use a thicker film to wrap the honeycomb core material for the first curing and shaping, so as to ensure the bonding strength of the film and the honeycomb to make the outer surface smooth , when the honeycomb core material and the outer skin are bonded, the adhesive film needs to be pasted again, so the amount of adhesive film for the overall structure will be greatly increased, which is contrary to the weight reduction requirements required by the structural parts of aviation parts

[0008] 2. This process requires at least two curing and shaping of the honeycomb core material in the forming mold, the process steps are complicated, and the cost of equipment and personnel is increased

[0009] 3. The scope of application is limited: this process first wraps the honeycomb core material with a layer of adhesive film and then cures and shapes it. The co-curing molding process in which the skin material is in the form of prepreg is not suitable for the step-by-step curing co-bonding process that is widely used in composite material manufacturing, where the skin is first cured and then bonded to the honeycomb core material

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