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Preparation method of sound-absorption honeycomb with embedded micro-perforated sound-eliminating separating plates

A technology of micro-perforation and honeycomb, which is applied in the direction of chemical instruments and methods, synthetic resin layered products, layered products, etc. It can solve the problems of the decline of the mechanical properties of the acoustic lining and the increase of its own weight, so as to maintain the mechanical properties and reduce its own weight. , The effect of saving materials

Inactive Publication Date: 2016-10-26
AVIC COMPOSITES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The multi-degree-of-freedom sound-absorbing structure is to change a single-layer honeycomb into a multi-layer honeycomb, and add a layer of porous plates between each honeycomb layer. However, there are certain problems in the use of this sound-absorbing structure. For example, micro-perforated plates and When the honeycomb core material is bonded, it is necessary to ensure that the holes are not blocked during the bonding process. In addition, the mechanical properties of the multi-degree-of-freedom sound-absorbing acoustic lining are greatly reduced during the design and preparation process. At the same time, the addition of micro-perforated panels , so that the weight of the material itself has increased significantly

Method used

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  • Preparation method of sound-absorption honeycomb with embedded micro-perforated sound-eliminating separating plates
  • Preparation method of sound-absorption honeycomb with embedded micro-perforated sound-eliminating separating plates
  • Preparation method of sound-absorption honeycomb with embedded micro-perforated sound-eliminating separating plates

Examples

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Effect test

Embodiment 1

[0030] A design and preparation technology for the preparation of a sound-absorbing honeycomb with an embedded micro-perforated sound-absorbing partition, characterized in that the design and preparation steps ( figure 1 )as follows:

[0031] (1) Select aramid paper honeycomb, glass cloth honeycomb, aluminum honeycomb or plant fiber honeycomb core with cell side length of 2.0mm-8.0mm;

[0032] (2) Select paraffin as the template material, and the brand on the paraffin layer is SY-37 low-temperature curing resin (product of Beijing Aeronautical Materials Research Institute), and the temperature is lowered below the freezing point of the paraffin;

[0033] (3) Use paraffin wax as the template material for the lower layer, and the upper layer is covered with low-temperature curing resin SY-37, and press it into the inner cavity of the honeycomb at the same time by using a press. The depth is 10%-90% of the honeycomb depth;

[0034] (4) According to the requirements of the resin...

Embodiment 2

[0038] Similar to Example 1, using paraffin as a template material, a design and preparation technology for the preparation of a sound-absorbing honeycomb with an embedded micro-perforated sound-absorbing partition, is characterized in that the design and preparation steps ( figure 1 )as follows:

[0039] (1) The main difference between it and Example 1 is that the unsaturated polyester with grade 240 (produced by Ashland) or grade 8175 (DSM) is selected as the embedded sound-absorbing partition material;

[0040] (2) paraffin is selected as the template material, and the unsaturated polyester of the above-mentioned brand is spread on the paraffin, and the temperature is down to below the paraffin freezing point;

[0041] (3) Use paraffin wax as the template material for the lower layer, and the upper layer is covered with liquid unsaturated polyester, and press it into the honeycomb cavity at the same time with a press. The depth of the honeycomb pressed into the resin and th...

Embodiment 3

[0046] 1. A design and preparation technology for the preparation of sound-absorbing honeycomb with embedded micro-perforated sound-absorbing partition, characterized in that the design and preparation steps of sound-absorbing honeycomb ( figure 2 )as follows:

[0047] ((1) Choose aramid paper honeycomb, glass cloth honeycomb, aluminum honeycomb or plant fiber honeycomb with cell side length of 2.0mm-8.0mm;

[0048] (2) Select clay or gypsum, and after mixing with water, make a soft clay or gypsum group, as a self-made mold board, the shop grade is SY-37 low-temperature curing resin (product of Beijing Aeronautical Materials Research Institute);

[0049] (3) The lower layer is made of clay or gypsum as a self-made mold board, and the upper layer is covered with low-temperature curing resin SY-37, which is pressed into the honeycomb cavity at the same time by a press. The depth of the honeycomb pressed into the resin and the supporting mold board is determined according to the...

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Abstract

The invention belongs to a manufacturing technology of functional honeycombs and relates to a preparation method of a sound-absorption honeycomb provided with embedded micro-perforated sound-eliminating separating plates. The thickness of a honeycomb is selected to range from 10 mm to 200 mm, the side length of an inner cavity of the honeycomb ranges from 2.0 mm to 8.0 mm, then epoxy resin, bismaleimide resin or unsaturated polyester resin and the like are laid on a supporting mold plate, the honeycomb is arranged on one surface, where resin is laid, of the supporting mold plate and is pressed into the supporting mold plate, the specific embedding depth of the embedded separating plates is 10%-90% of the depth of the honeycomb, and then curing treatment is conducted; then demolding is performed, the honeycomb structure provided with the embedded resin separating plates is obtained, laser micro-perforating treatment is performed on the embedded resin separating plates in the obtained honeycomb structure provided with the embedded resin separating plates, and the sound-absorption honeycomb provided with the embedded micro-perforated sound-eliminating separating plates is obtained. The honeycomb structure provided with the embedded separating plates is designed and formed by the aid of the structure of the inner cavity of a core material of the honeycomb, in cooperation with the laser micro-perforating technology, micro sound-absorption holes are evenly distributed in the embedded separating plates, and the sound-absorption honeycomb provided with the embedded micro-perforated sound-eliminating separating plates is obtained.

Description

technical field [0001] The invention belongs to the functional honeycomb manufacturing technology, and relates to a preparation method of a sound-absorbing honeycomb embedded with a micro-perforated sound-absorbing partition. Background technique [0002] In order to reduce the noise of the aircraft engine structure, the current noise reduction technology mostly adopts the sandwich material sound-absorbing structure prepared by the micro-perforated panel / honeycomb composite, which is characterized by the composite structure composed of the honeycomb and the micro-perforated plate, and the rigid back plate. The principle of noise reduction is that the external sound waves are absorbed and transmitted into the honeycomb structure through the holes regularly distributed on the panel, and the sound waves are reflected, refracted, passed and absorbed inside the honeycomb, and are no longer conducted through the holes that enter, so as to achieve structural reduction. purpose of n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B3/12B32B27/06
CPCB32B3/12B32B27/06B32B2605/18B32B2307/102
Inventor 史湘宁纪双英郝巍王清明
Owner AVIC COMPOSITES
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