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Preparation method of composite material curved surface honeycomb

A composite material and honeycomb technology, which is applied in home appliances, other home appliances, household components, etc., can solve the problems of inability to form honeycomb structure, honeycomb failure, and large honeycomb stress, so as to achieve simple forming process and improve surface-core bonding Strength, the effect of simple preparation method

Active Publication Date: 2022-02-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This forming technique does not form honeycomb structures
[0012]Currently, the aluminum alloy curved honeycomb is widely used in engineering. The composite material curved honeycomb has the advantages of high specific strength, high specific stiffness and low thermal expansion, and has high application However, at present, there is no good molding process for composite material curved honeycomb
The aluminum alloy curved surface honeycomb is to bend the plane honeycomb into a curved shape by force. However, the composite material honeycomb has a high modulus. If the plane is forced to be bent into a curved surface, the stress in the honeycomb will be greater, and it is more likely to cause premature failure of the honeycomb.
However, the structure formed by the clamp lock forming process is not strictly a curved honeycomb structure.
3D printing technology cannot print composite honeycomb structures with continuous fibers, but can only print short-fiber honeycomb structures, which have low mechanical properties and high costs, and are not suitable for modern industrial production.

Method used

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  • Preparation method of composite material curved surface honeycomb
  • Preparation method of composite material curved surface honeycomb
  • Preparation method of composite material curved surface honeycomb

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0067] Specific embodiment one: a kind of preparation method of composite curved surface honeycomb, it comprises the following steps:

[0068] Step 1: cutting the composite material prepreg, and opening holes on the surface of the composite material prepreg;

[0069] The composite prepreg is provided with a plurality of slitting lines 1 3 and 2 slitting lines 4; the slitting lines 1 3 and 2 slitting lines 4 are alternately arranged, and each slitting line 3 cuts a plurality of holes 1 1. Multiple holes are cut on each cutting line 2 4;

[0070] Step 2: Arranging folding paths on the composite material prepreg;

[0071] The folding path includes multiple groups of folding path 1 and multiple groups of folding path 2; each group of folding path 1 includes two symmetrically arranged path lines 5, and a hole with two inflection points is provided on both sides of the hole 1. Side, both sides of the hole 2 2 are provided with a side with two inflection points, a path line 5 is th...

specific Embodiment approach 2

[0083] Embodiment 2: A method for preparing a composite material curved honeycomb, wherein the honeycomb unit cells of the honeycomb cylindrical shell structure are regular hexagonal unit cells, square unit cells, negative Poisson's ratio unit cells or regular triangular unit cells.

[0084] Other implementation manners are the same as the specific implementation manner 1.

specific Embodiment approach 3

[0085] Specific embodiment three: a preparation method of a composite material curved surface honeycomb, the maximum distance A between the two path lines 5 of each group of folded paths 1 is 21 2 +l 3 , the maximum distance between the two path lines 26 of each group of folded path 2 is l 3 , the maximum distance between each path line 1 5 of each hole 1 and its adjacent path line 2 6 is l 2 , the minimum distance between two adjacent groups of folding path 1 is l 1 , the included angles between the path line one 5 and path line two 6 and the horizontal line are α, and the n is the number of unit cells in the circumferential direction, r is the inner radius of the formed honeycomb shell structure, h c is the height of the honeycomb cylindrical shell structure, the plane between the path line 15 of each hole 1 and the adjacent path line 2 6 of the hole 1 and the two adjacent path lines 5 of the hole 1 The included angle of the formed plane is

[0086] In this embodimen...

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Abstract

The invention relates to the field of preparation of curved surface honeycombs, in particular to a preparation method of a composite material curved surface honeycomb, and aims to solve the problem that no appropriate forming technology is provided for the composite material curved surface honeycomb at present. According to the method, a composite prepreg is cut, holes are made on the surface of the composite prepreg, and a plurality of first cutting lines and second cutting lines are arranged on the composite prepreg; the first cutting lines and the second cutting lines are alternately arranged, a plurality of first holes are cut in each first cutting line, and a plurality of second holes are cut in each second cutting line; folding paths comprise a plurality of groups of folding paths I and a plurality of groups of folding paths II; each group of folding paths I comprises two symmetrically arranged path lines I, each group of folding paths II comprises two symmetrically arranged path lines II, and then the procedures of primary folding, secondary folding, honeycomb curing and honeycomb demolding are carried out, the method is simple, batch preparation is easy to realize, raw materials are saved, and the method can be used for forming various honeycomb cylindrical shell structures.

Description

technical field [0001] The invention relates to the field of curved-surface honeycomb preparation, in particular to a method for preparing a composite material curved-surface honeycomb. Background technique [0002] Composite honeycomb structure has excellent mechanical properties such as light weight, high specific strength and high specific stiffness, and is widely used in aerospace structures. The honeycomb structure is not only applied to the flat plate structure, but also can form various complex curved surface structures, so as to be suitable for various curved surface shapes. However, the molding technology of composite material curved honeycomb structure is still immature. The existing manufacturing curved honeycomb structure mainly has the following processes: [0003] (1) Natural bending [0004] At present, the aluminum honeycomb plate structure is widely used in engineering. Due to the good toughness of the aluminum alloy, the honeycomb plate is first prepared ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D99/00
CPCB29D99/0089
Inventor 熊健李志彬韦兴宇王焱陈宗兵
Owner HARBIN INST OF TECH