Composite honeycomb core and preparation method thereof

Abstract

The invention relates to a composite honeycomb core and a preparation method thereof. The preparation method comprises the steps of cutting, primary folding, secondary folding, solidification and demolding. According to the step of cutting, cutting seams with an arrangement law are formed in the surface of a composite prepreg. According to the arrangement law, a cutting seam line 1 is a straight line composed of n complete cutting seams A and cuts B at intervals, and the upper and lower ends of the cutting seam line 1 do not intersect with the upper and lower edges of the composite prepreg; acutting seam line 2 is a straight line composed of the cutting seam C, a cutting seam D, n-1 complete cutting seams A and cuts B, the cutting seam C intersects with the upper edge of the composite prepreg, the cutting seam D intersects with the lower edge of the composite prepreg, and the cutting seams A and the cuts B are in the middle at intervals; the lengths of the cutting seam C and cutting seam D are both smaller than those of the cutting seams A; and the space between the cutting seam line 1 and the cutting seam line 2 is equal to the height H of a honeycomb unit cell. According to thepreparation method, the material utilization rate is high, the preparation mode is continuous, and automatic preparation can be achieved.

Description

technical field [0001] The invention relates to the technical field of honeycomb structures, in particular to a composite material honeycomb core and a preparation method thereof. Background technique [0002] The current honeycomb structure mainly uses metal, aramid paper and polymer materials as the base material. The preparation methods generally include the following three types: (1) For metal materials with high differential modulus of toughness, such as stainless steel, etc., the corrugated connection method is generally used. Preparation: Prepare the base material into a corrugated plate shape by rolling and other mechanical means, cut it into a predetermined size and stack it together to form a honeycomb structure; (2) For metal structures with good toughness, such as aluminum alloys, etc., generally Stretching method: cut the metal foil into a specified size in advance, apply a strip of glue on it, and stretch it after curing to form a honeycomb structure; (3) For a...

AI Technical Summary

Problems solved by technology

This method prefabricates the slot inside the honeycomb, which is equivalent to introducing cracks, which has become a hidden danger.

[0007] On the whole, at present, there is no mature and complete preparation process for the composite material honeycomb structure, and the performance of the honeycomb prepared by the 3D printing method is weak; The mold is not conducive to practical application; the interlocking method introduces the slot, which is equivalent to a crack, which has a great impact on the overall mechanical properties of the honeycomb structure. For large-sized structures, how to reduce the impact of processing errors on structural assembly also very tricky

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