阅读说明：本技术 一种蜂窝夹芯复合材料声衬壁板通孔率控制方法 (Method for controlling through hole rate of acoustic lining wall plate made of honeycomb sandwich composite material ) 是由 文友谊 文诗琦 李静尧 陈翠 向海 蔡豫晋 龚志红 于 2019-10-17 设计创作，主要内容包括：本发明提出了一种蜂窝夹芯复合材料声衬壁板通孔率控制方法,采用预固化方式在复材蒙皮上依次预先铺叠胶膜和可剥层,在低于胶膜固化温度的条件下进行短时预固化,实现胶膜和复材蒙皮的预胶接,再对预胶接的复材蒙皮钻制声衬阵列孔,去除可剥层后,再与蜂窝和蜂窝芯上复材蒙皮进行胶接。本发明通过在蜂窝芯下复材蒙皮上预固化一层胶膜再钻声衬孔阵列,在不降低声衬面板与蜂窝夹芯胶接强度的情况下,有效的保证了蜂窝夹芯复合材料声衬壁板胶接完成后的通孔率。(The invention provides a method for controlling the through hole rate of a honeycomb sandwich composite material acoustic lining wall plate, which comprises the steps of sequentially pre-paving an adhesive film and a strippable layer on a composite material skin in a pre-curing mode, carrying out short-time pre-curing at the temperature lower than the curing temperature of the adhesive film to realize pre-bonding of the adhesive film and the composite material skin, drilling an acoustic lining array hole on the pre-bonded composite material skin, removing the strippable layer, and then bonding the acoustic lining array hole with the composite material skin on a honeycomb and a honeycomb core. According to the invention, through pre-curing a layer of adhesive film on the composite material skin under the honeycomb core and drilling the acoustic lining hole array, the through hole rate of the honeycomb sandwich composite material acoustic lining wall plate after the bonding is finished is effectively ensured under the condition that the bonding strength of the acoustic lining panel and the honeycomb sandwich is not reduced.)

1. A method for controlling the through hole rate of a honeycomb sandwich composite material sound lining wall plate comprises the following steps:

s1, preparing a composite lower skin in a state of a cured laminated board;

s2, sequentially laying a glue film and a strippable layer on the surface of the composite lower skin;

s3 precuring

S4, drilling an acoustic lining hole array on the composite material lower skin, the pre-cured adhesive film and the strippable composite board;

s5, tearing off the peelable cloth, and sequentially laying the honeycomb core, the adhesive film and the composite upper skin on the composite lower skin containing the acoustic liner hole;

s6 sealing the bag and vacuumizing;

s7 bonding the honeycomb sandwich composite material acoustic lining wall plate component by autoclave under the component curing process parameters.

2. The method for controlling the through-hole rate of the acoustic lining wall panel with the honeycomb sandwich composite material as claimed in claim 1, wherein the pre-curing in the step S3 is as follows: pre-curing for 20-30min at the temperature 10-30 ℃ lower than the gel point of the adhesive film;

the method for controlling the through-hole rate of the acoustic lining wall panel with the honeycomb sandwich composite material as claimed in claim 1, wherein in the step S5, the composite material upper skin is in an uncured state.

3. The method for controlling the through hole rate of the sound lining wall panel with the honeycomb sandwich composite material according to claim 1, wherein in the step S5, the composite material upper skin is formed by laying fabric prepreg or unidirectional tape prepreg.

4. The method for controlling the through-hole rate of the sound lining wall panel with the honeycomb sandwich composite material as claimed in claim 1, wherein the adhesive film is an adhesive film cured at 180 ± 5 ℃.

5. The method for controlling the through-hole rate of the sound lining wall panel with the honeycomb sandwich composite material as claimed in claim 1, wherein the adhesive film is a film adhesive with a glass fiber fabric carrier.

Technical Field

The invention provides a method for controlling the through hole rate of a honeycomb sandwich composite material sound lining wall plate, and aims to solve the problems that when a glue film is adopted to glue a honeycomb and a composite material skin containing array sound lining holes, the glue film flows into the sound lining holes to cause hole blockage, the through hole rate cannot meet the requirement, and the established noise reduction function cannot be realized.

Background

Due to the excellent comprehensive performance of the carbon fiber reinforced resin matrix composite, the application proportion of the carbon fiber reinforced resin matrix composite in the field of engine parts is gradually improved, such as a culvert casing, a stator blade, a rotor blade, a containing casing, a thrust reverser and the like. Meanwhile, the composite material has low density, so that the structural weight can be obviously reduced, the traditional material can be replaced, the structural function integrated design is realized, and the composite material is widely applied to the engine nacelle.

With the application of the noise reduction structure of the carbon fiber reinforced resin matrix composite material nacelle, the noise of the engine is obviously improved, and the noise reduction structure is closely related to a series of noise reduction measures adopted by the engine nacelle. In order to realize the noise reduction function, structures such as an air inlet inner wall plate, a reverse-thrust inner wall plate and the like of the engine nacelle are designed into a sound lining wall plate structure, a panel on the inner flow channel side meets the noise reduction requirement by using a perforated plate, and the perforated panel is generally required to keep the through hole rate of more than 98 percent after being bonded with the honeycomb core. According to the common composite material bonding technology, the perforated panel is likely to be blocked by an adhesive film in the bonding process with the honeycomb core, the noise reduction effect of the acoustic lining wall plate is reduced, and the drill bit directly drills the node of the honeycomb core in the mode of drilling the acoustic lining array hole after the bonding, so that the mechanical property of the honeycomb core is reduced.

Therefore, a method for controlling the through hole rate of the acoustic lining wallboard made of the honeycomb sandwich composite material is needed to be developed, wherein the method can ensure the bonding strength of the perforated composite material skin and the honeycomb core and can not cause the perforated composite material skin to be blocked.

Disclosure of Invention

The invention provides a method for controlling the through hole rate of a honeycomb sandwich composite material sound lining wall plate, which comprises the step of manufacturing parts and aims to overcome the problems that when a glue film is adopted to glue a honeycomb and a composite material skin containing array sound lining holes, the glue film flows into the sound lining holes to cause hole blockage, the through hole rate cannot meet the requirement, and the established noise reduction function cannot be realized.

The purpose of the invention is realized by the following technical scheme:

a method for controlling the through hole rate of a honeycomb sandwich composite material acoustic lining wallboard,

s1, preparing a composite lower skin in a state of a cured laminated board;

s2, sequentially laying a glue film and a strippable layer on the surface of the composite lower skin;

s3 precuring

S4, drilling an acoustic lining hole array on the composite material lower skin, the pre-cured adhesive film and the strippable composite board;

s5, tearing off the peelable cloth, and sequentially laying the honeycomb core, the adhesive film and the composite upper skin on the composite lower skin containing the acoustic liner hole;

s6 sealing the bag and vacuumizing;

s7 bonding the honeycomb sandwich composite material acoustic lining wall plate component by autoclave under the component curing process parameters.

The step S3 is pre-cured as follows: pre-curing for 20-30min at the temperature 10-30 ℃ lower than the gel point of the adhesive film;

in the step S5, the composite material upper skin is in an uncured state.

In the step S5, the composite material upper skin is formed by laying fabric prepreg or unidirectional tape prepreg.

The adhesive film is cured at 180 +/-5 ℃.

The adhesive film is a film-shaped adhesive with a glass fiber fabric carrier.

The honeycomb sandwich composite material acoustic lining wall panel comprises a composite material lower skin, a honeycomb core and a composite material upper skin, wherein an acoustic lining array hole is formed in the composite material lower skin; and adopting a glue film to glue the composite material lower skin containing the sound liner array holes, the honeycomb core and the composite material upper skin.

The invention has the following beneficial effects:

1) the invention adopts the process lower than the curing temperature of the glue film to pre-glue the glue film and the composite material skin, uses the strippable cloth to protect and then drills the sound lining holes together, thereby effectively solving the problem that the traditional glue joint process is difficult to control the plugging of the sound lining array holes of the sound lining plate of the honeycomb sandwich composite material by the glue film, and ensuring the sound attenuation and noise reduction effects of the sound lining plate to the maximum extent;

2) the damage to the honeycomb sandwich caused by the acoustic lining hole array after the acoustic lining wall plate component made of the honeycomb sandwich composite material is glued and formed is avoided.

3) The invention is suitable for the adhesive film with and without the carrier for the adhesive bonding of any composite material.

Drawings

FIG. 1 is a schematic diagram of pre-curing of a film.

Fig. 2 is a schematic view of acoustic liner array hole drilling.

Fig. 3 is a view a-a of fig. 2.

FIG. 4 is a schematic view of the composite lower skin, honeycomb, and composite upper skin assembled.

FIG. 5 is a schematic view of a cellular sandwich composite acoustic liner wall panel construction.

In the figure: 1. the composite material comprises a tool 2, a putty strip 3, a composite material lower skin 4, a glue film 5, a peelable layer 6, an isolation film 7, an air-permeable felt 8, a vacuum bag 9, a sound lining hole 10, a honeycomb core 11 and a composite material upper skin.

Detailed Description

For further illustration and not limitation of the above-mentioned implementation of the present invention, the following method for controlling the porosity of the acoustic lining wall panel made of honeycomb sandwich composite material and the manufacturing process thereof are further described with reference to the drawings and examples, but the present invention is not limited thereto. All such concepts are intended to be within the scope of the present disclosure and the present invention.