WO2018196514A1

WO2018196514A1 - Method for preparing composite material gas intake passage, and composite material gas intake passage

Info

Publication number: WO2018196514A1
Application number: PCT/CN2018/079810
Authority: WO
Inventors: 刘若鹏; 赵治亚; 王晨玥
Original assignee: 深圳光启高等理工研究院
Priority date: 2017-04-28
Filing date: 2018-03-21
Publication date: 2018-11-01
Also published as: CN108790211B; CN108790211A

Abstract

Disclosed are a method for preparing a composite material gas intake passage and a composite material gas intake passage, wherein the preparation method comprises the following steps: a) laying at least one layer of a prepreg on a female mould (1) to form a prepreg layer (5); b) placing a gasbag (3) in the prepreg layer (5), and completing mould assembly; c) inflating the gasbag (3) to a predetermined pressure, and pressing the prepreg layer (5) between the outer surface of the gasbag (3) and the inner surface of the female mould (1); d) subjecting the entire mould assembled in step c) to a curing treatment; and e) relieving the pressure in the gasbag (3) and opening the mould to release the prepared composite material gas intake passage green body. The composite material gas intake passage prepared by means of the preparation method can be applied to an aerostatic vehicle such as an air boat, has the advantages of a light mass, a low degree of processing difficulty, strong weatherability, etc., and can improve the continued flight capability of the aerostatic vehicle.

Description

Composite material inlet preparation method and composite material inlet

Technical field

The present invention relates to the field of space technology, and more particularly to a composite material intake port preparation method and a composite material intake port.

Background technique

Conventional aerostats, such as the air intake of an airship, are made of a metallic material.

technical problem

Although the existing intake port can maintain a certain structural strength, its mass is large, which increases the overall quality of the aerostat and is not conducive to the improvement of the endurance of the aerostat. Moreover, due to the difficulty of processing, the processing quality is difficult to ensure, which greatly increases the manufacturing cost. On the other hand, the weathering performance of the inlet made of metal is not good, and it is difficult to adapt to the complicated and variable high-altitude environment in which the aerostat operates.

Technical solution

In view of the above, an object of the present invention is to provide a composite material inlet manufacturing method and a composite material inlet port to solve the problems in the prior art.

According to a first aspect of the present invention, there is provided a composite material inlet manufacturing method comprising the steps of:

a) laying at least one layer of prepreg on the female mold to form a prepreg layer;

b) placing an airbag in the prepreg layer and completing the clamping;

c) inflating the airbag to a preset pressure, and pressing the prepreg layer between the outer surface of the airbag and the inner surface of the female mold;

d) curing the mold after the mold clamping in step c) as a whole;

e) venting the pressure in the airbag and performing mold opening to remove the prepared composite material inlet body.

Preferably, the method further comprises the following steps:

Before the step a), firstly, a plurality of layers of degumming agents are brushed on the inner surface of the female mold, and the layers of the debonding agent are respectively dried for a predetermined period of time after the brushing.

Preferably, the drying time of the inner layer of the debonding agent is greater than 20 minutes, and the drying time of the outermost layer of the debonding agent is greater than 40 minutes.

Preferably, after the degumming agent is dried, a release cloth layer is laid on the degumming agent,

Wherein, the release cloth layer is formed by butting a plurality of release cloths, and the butt joint gap is less than or equal to 1 mm, and the area of the release cloth of each block is greater than or equal to 10 cm 2 .

Preferably, the prepreg comprises a first layer of prepreg and a second layer of prepreg, the step a) comprising:

Defrosting the raw materials of the prepreg to be laid in each layer;

Raw materials of the prepreg of each layer of the thawing layer are separately cut as needed;

The cut first layer of prepreg and the second layer of prepreg are sequentially applied to the negative mold to form a first layer of prepreg and a second layer of prepreg which are laminated.

Preferably, the first layer of prepreg is an epoxy/double horse/cyanate carbon fiber prepreg and the second layer of prepreg is an epoxy/double horse/cyanate quartz prepreg.

Preferably, after each layer of the prepreg is pasted, vacuuming treatment is separately performed.

Preferably, in the step b), after the airbag is placed in the prepreg layer, the mandrel is placed in the middle position in the airbag, and then the mold clamping is completed.

Preferably, the preset pressure value is 0.4-0.6 MPa.

Preferably, the curing temperature in the curing treatment is 100-220 ° C, and the curing time is 2-9 hours.

Preferably, the step further comprises:

After the step e), the surface of the prepared composite inlet body is ground to obtain the inlet.

According to a second aspect of the present invention, there is provided a composite material inlet which is produced by the preparation method described.

Beneficial effect

According to the composite material inlet method and the composite material inlet provided by the invention, the airbag molding is simple to demould, the airbag can be repeatedly used, the molding pressure is uniform, and the airbag can be properly adjusted according to the requirements of the composite air inlet, thereby reducing the manufacturing. Cost and manufacturing difficulty. Compared with a mold such as a water-soluble core mold, the preparation method using the combined mold form has the advantages of low cost, simple molding, and reusable use. The composite material inlet prepared by the preparation method can be applied to an aerostat such as an airship, and has the advantages of light weight, low processing difficulty, strong weather resistance, etc., while maintaining structural strength and meeting normal use requirements. Improve the endurance of the aerostat.

DRAWINGS

The above and other objects, features and advantages of the present invention will become apparent from

1 shows a flow chart of a method of preparing a composite feed port in accordance with an embodiment of the present invention. 2 is a cross-sectional view showing a mold clamping structure of a composite material intake port preparation method according to an embodiment of the present invention.

3 shows a flow chart of step S2) of a method of preparing a composite inlet port in accordance with an embodiment of the present invention.

In the drawings, a female mold 1, a core mold 2, an airbag 3, an upper cover 41, a lower cover 42, a prepreg layer 5, a punching port 61, a pressure relief port 62, and a fastening screw 7.

Embodiments of the invention

Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In the various figures, the same elements are denoted by the same or similar reference numerals. For the sake of clarity, the various parts in the figures are not drawn to scale.

1 shows a flow chart of a method of preparing a composite feed port in accordance with an embodiment of the present invention. 2 is a schematic view showing a mold clamping structure of a composite material intake port preparation method according to an embodiment of the present invention. The prepared composite inlet can be used as an intake port on an aerostat such as an airship.

As shown in FIG. 1-2, a method for preparing a composite inlet port according to an embodiment of the present invention includes the following steps:

S1), the surface of the female mold 1 is treated to enhance the late demolding effect.

In this step, when applying the degumming agent, it is necessary to ensure that the surface temperature of the female mold 1 is greater than a certain temperature value, and ≥ 15 ° C is required here. To apply the degumming agent, make sure that the surface of the tool is clean and dry. Use a dust-free cloth to remove the degumming agent and apply evenly on the surface of the mold. In order to keep the coating from leaking, a certain coating thickness is not guaranteed, and it is necessary to apply a plurality of times, and it is optional to apply 2-3 times. Each layer of degumming agent is evenly applied, for example, cross-painting in multiple directions to ensure uniform coating. If excessive degumming agent is applied, it should be wiped off the mold with a clean cloth. Among them, the inner layer of degumming agent is dried for at least 20 minutes after being applied; after the last layer, that is, the outermost layer of degumming agent is applied, it needs to be dried in the air for at least 40 minutes. When applying the degumming agent, ensure that the site is well ventilated, painted and recorded. After the degumming agent is dried, a release cloth layer is laid on the debonding agent, wherein the release cloth layer is formed by butting a plurality of release cloths, and the butt joint gap is less than or equal to 1 mm. The area of the release cloth is greater than or equal to 10 [cm]^2^. The tooling line of the composite inlet to be prepared is determined on the mold.

S2), at least one layer of prepreg is laid on the female mold 1 to form a prepreg layer 5.

In this embodiment, two layers of prepregs of different materials are sequentially laid on the inner surface of the cathode. As shown in FIG. 3, in this step, the following steps are further included:

S21), thawing the raw materials of the prepreg to be paved in each layer;

Specifically, after the prepreg raw material is taken out, it is thawed in a clean room, and is kept in a sealed state during the thawing process to prevent it from coming into contact with the outside before use, causing a chemical reaction or falling into dust. Take care when handling, and avoid bumping the material.

During the thawing process, the temperature of the clean room is controlled at 18 ° C to 24 ° C. When the temperature of the material reaches the clean room temperature, it can be determined by hand without touching the temperature difference between the environment and the outer film of the sealed bag. It can be used when no condensed water is produced. For the thawing time, the thawing time is ≥8 h at 20 °C ± 5 °C, and the thawing time is ≥ 2 hours for the prepreg that has been cut.

S22), the raw materials of the prepreg of each layer of the thawing layer are separately cut as needed;

Specifically, the digital model of the product is developed using a design software surface and cut into corresponding shapes to facilitate layup and formation of a cylindrical structure of the composite inlet.

S23), the cut first layer of prepreg and the second layer of prepreg are sequentially laid on the female mold 1 to form a first layer of prepreg and a second layer of prepreg;

Specifically, the first layer of prepreg is an epoxy/double horse/cyanate carbon fiber prepreg, and the second layer of prepreg is an epoxy/double horse/cyanate quartz prepreg. After the first prepreg is applied to the inner surface of the female mold 1, the layer prepreg is sealed with a vacuum bag and subjected to vacuum treatment to compact the first layer of prepreg. Then, the vacuum bag is removed, a second layer of prepreg is laid on the first layer of prepreg, and the second layer of prepreg is packaged in a vacuum bag and vacuumed to pre-dip the second layer. The material was compacted and the vacuum bag was removed.

S3), the airbag 3 is placed in the prepreg layer 5, and the mold clamping is completed.

Specifically, the air bag 3 is placed in the negative mold 1 in which the two layers of prepreg are laid, and the prepreg layer 5 is pressurized after being filled with a gas of a certain pressure. The specific shape of the airbag 3 after inflation can be cylindrical, and the material thereof can be selected as mold silicone rubber, and the size of the airbag 3 can be determined according to specific needs, such as pressure parameters. In order to better effect the pressurization of the prepreg layer 5, a mandrel 2 may be placed in the inner cylinder of the airbag 3 for supporting the inflated airbag 3. The core mold 2 is specifically made of steel. After the core mold 2 is placed, the upper cover 41 and the lower cover 42 at both ends of the female mold 1 are fastened, and the fastening screws 7 for fixing the upper cover 41 and the lower cover 42 to the end surface of the female mold 1 are screwed, and the screws are screwed. Tighten until the entire mold is tightly bonded to complete the mold clamping. At this time, the pressure filling port of the airbag 3 is exposed to the outside of the upper cover 41, and the pressure releasing port 62 is exposed to the outside of the lower cover 42.

S4), inflating the inside of the airbag 3 to a preset pressure, and pressing the prepreg layer 5 between the outer surface of the airbag 3 and the inner surface of the female mold 1.

In this step, the pressure relief port 62 is closed, and the inside of the airbag 3 is pressurized to 0.4-0.6 MPa, and then the pressure-filling port is closed. At this time, the outer surface of the airbag 3 tightly presses the first prepreg layer 5 and the second prepreg layer 5 on the inner surface of the female mold 1, thereby realizing the first prepreg layer 5 and the second pre-preg The pressure of the immersion layer 5 is applied.

S5), the entire mold after the mold clamping is cured.

In this step, the mold after the mold clamping is placed in an oven to be solidified. During the curing process, the curing temperature is maintained at 100-220 ° C and the curing time is 2-9 hours.

S6), venting the pressure inside the air bag 3, and performing mold opening to take off the prepared composite material inlet body.

In this step, the entire cured mold is first cooled and then taken out of the oven. The pressure relief port 62 is opened to vent the pressure inside the air bag 3. Then, the fastening screw 7 is loosened, the upper cover 41 and the lower cover 42 are opened, the airbag 3 and the core mold 2 are sequentially taken out, and finally the prepared composite material inlet body is taken out.

S7), grinding the surface of the prepared composite inlet body to obtain the inlet.

In this step, the outer surface of the prepared composite inlet body is polished and repaired with 180-240 mesh sandpaper to make the surface smooth, thereby obtaining the composite inlet of the composite.

In this application, the airbag 3 is molded and demoulded simply, the airbag 3 can be repeatedly used, the molding pressure is uniform, and the airbag can be properly adjusted according to the requirements of the composite air inlet, which reduces the manufacturing cost and the manufacturing difficulty. Compared with the mold such as the water-soluble core mold 2, the preparation method in the form of the combined mold has the advantages of low cost, simple molding, and reusable use. The composite material inlet prepared by the preparation method can be applied to an aerostat such as an airship, and has the advantages of light weight, low processing difficulty, strong weather resistance, etc., while maintaining structural strength and meeting normal use requirements. Improve the endurance of the aerostat.

It should be noted that, in this context, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities or operations. There is any such actual relationship or order between them. Furthermore, the term "comprises" or "comprises" or "comprises" or any other variations thereof is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device that comprises a plurality of elements includes not only those elements but also Other elements, or elements that are inherent to such a process, method, item, or device. An element that is defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, item, or device that comprises the element.

It should be noted that the above-described embodiments are merely illustrative of the invention and are not intended to limit the embodiments. Other variations or modifications of the various forms may be made by those skilled in the art in light of the above description. There is no need and no way to exhaust all of the implementations. Obvious changes or variations resulting therefrom are still within the scope of the invention.

Claims

A composite material inlet manufacturing method, characterized in that the method comprises the following steps:

a) laying at least one layer of prepreg on the female mold to form a prepreg layer;

b) placing an airbag in the prepreg layer and completing the clamping;

c) inflating the airbag to a preset pressure, and pressing the prepreg layer between the outer surface of the airbag and the inner surface of the female mold;

d) curing the mold after the mold clamping in step c) as a whole;

e) venting the pressure in the airbag and performing mold opening to remove the prepared composite material inlet body.
The composite material inlet manufacturing method according to claim 1, wherein the method further comprises the following steps:

Before the step a), firstly, a plurality of layers of degumming agents are brushed on the inner surface of the female mold, and the layers of the debonding agent are respectively dried for a predetermined period of time after the brushing.
The composite material inlet manufacturing method according to claim 2, wherein the drying time of the inner layer of the debonding agent is greater than 20 minutes, and the drying time of the outermost layer of the debonding agent is greater than 40 minutes.
The composite material intake port preparation method according to claim 2, wherein the method further comprises the following steps:

After the degumming agent is dried, a release cloth layer is laid on the degumming agent.

Wherein, the release cloth layer is formed by butting a plurality of release cloths, and the butt joint gap is less than or equal to 1 mm, and the area of the release cloth of each block is greater than or equal to
.
The composite inlet port preparation method according to claim 1, wherein the prepreg comprises a first layer of prepreg and a second layer of prepreg, and the step a) comprises:

Defrosting the raw materials of the prepreg to be laid in each layer;

Raw materials of the prepreg of each layer of the thawing layer are separately cut as needed;

The cut first layer of prepreg and the second layer of prepreg are sequentially applied to the negative mold to form a first layer of prepreg and a second layer of prepreg which are laminated.
The composite inlet port preparation method according to claim 5, wherein the first layer of prepreg is an epoxy/double horse/cyanate carbon fiber prepreg, and the second layer of prepreg It is an epoxy/double horse/cyanate quartz prepreg.
The method of preparing a composite material inlet according to claim 1, wherein after each layer of the prepreg is pasted, vacuuming is performed separately.
A composite material intake port preparation method according to claim 1, wherein

In the step b), after the airbag is placed in the prepreg layer, the mandrel is placed in the middle position in the airbag, and then the mold clamping is completed.
A composite material intake port preparation method according to claim 1, wherein

The preset pressure value is 0.4-0.6 MPa.
A composite material intake port preparation method according to claim 1, wherein

The curing temperature in the curing treatment is 100-220 ° C, and the curing time is 2-9 hours.
The composite material inlet manufacturing method according to claim 1, wherein the method

Also includes:

After the step e), the surface of the prepared composite inlet body is ground to obtain the inlet.
A composite material inlet port, which is produced by the production method according to any one of claims 1-11.