CN112829161A - Foaming glue filling method for composite material honeycomb sandwich structure - Google Patents
Foaming glue filling method for composite material honeycomb sandwich structure Download PDFInfo
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- CN112829161A CN112829161A CN202110015947.XA CN202110015947A CN112829161A CN 112829161 A CN112829161 A CN 112829161A CN 202110015947 A CN202110015947 A CN 202110015947A CN 112829161 A CN112829161 A CN 112829161A
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- honeycomb core
- foaming
- filling
- composite material
- sandwich structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3403—Foaming under special conditions, e.g. in sub-atmospheric pressure, in or on a liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3415—Heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/60—Measuring, controlling or regulating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to a foaming glue filling method for a composite material honeycomb sandwich structure, which comprises the following steps: laying a layer of strip-shaped foaming adhesive on the side of the honeycomb core attaching mold, heating and extruding the layer of strip-shaped foaming adhesive into a filling cavity of the honeycomb core, and laying a single-layer isolating film between the honeycomb core and the mold; filling powdery foaming glue on the non-die-attaching side of the honeycomb core, and paving a plurality of layers of isolating films; and putting the forming die into curing forming equipment for heating and curing the foaming adhesive. The foaming adhesive filling method for the composite material honeycomb sandwich structure can eliminate the residual stress generated by the solidification and shrinkage of the foaming adhesive because the foaming process is carried out after the pre-bonding of the composite material honeycomb sandwich structure workpiece, only the foaming surface on one side is bound, and the other side is not bound, so that the generation of air wrapping in the filling cavity of the honeycomb core in the process of filling the foaming adhesive is avoided, and the filling quality and efficiency are improved. Because the honeycomb core is formed separately, the pre-bonding procedure is cancelled, and the manufacturing cost of the composite material honeycomb sandwich structure is reduced.
Description
Technical Field
The invention relates to the technical field of composite material manufacturing, in particular to a foaming glue filling method for a composite material honeycomb sandwich structure.
Background
The composite material honeycomb sandwich structure is a structural form with high specific stiffness performance and is widely applied to aerospace aircraft structures. In composite honeycomb sandwich structures, the honeycomb core in the nail region is often filled with foam for assembly requirements. The traditional forming process method generally adopts the steps of pre-bonding the cured outer skin and the honeycomb core, filling the honeycomb core with foaming glue, performing a foaming glue curing process, and finally bonding the honeycomb core and the inner skin. Because the outer skin makes the structural asymmetry occur after the honeycomb is pre-bonded, the workpiece bends to the side of the pre-bonded honeycomb, the deformation is often corrected in the bonding process, and the residual stress of the foaming adhesive is released along with the time, so that the workpiece deforms again. This is particularly true for large curvature, large area honeycomb core sandwich structures. In the traditional process, after pre-bonding, one side of the honeycomb core filling cavity is sealed by the outer skin, the honeycomb core filling cavity is wrapped with air in the process of filling the foaming glue, so that the foaming glue is not easy to be completely filled, and in the foaming process, the volume of the wrapped air is increased along with the temperature rise, so that the foaming glue overflows from the honeycomb core filling cavity.
Disclosure of Invention
The embodiment of the invention provides a foaming glue filling method for a composite material honeycomb sandwich structure. The foaming adhesive filling method for the composite material honeycomb sandwich structure can eliminate the residual stress generated by curing and shrinking of the foaming adhesive, because the foaming process is performed after pre-bonding, only one side of the foaming surface is bound, and the other side of the foaming surface is not bound when a composite material honeycomb sandwich structure workpiece is formed. Avoid taking place to wrap up in the packing intracavity of honeycomb core at the in-process of filling the foaming glue and wrap up in the gas, improve filling quality and efficiency. Because the honeycomb core is formed separately, the pre-bonding procedure is cancelled, and the manufacturing cost of the composite material honeycomb sandwich structure is reduced.
The embodiment of the invention provides a foaming glue filling method for a composite material honeycomb sandwich structure, wherein a die attaching side and a non-die attaching side are oppositely arranged on a honeycomb core in the thickness direction of the honeycomb core, a filling cavity is arranged in the honeycomb core, and the foaming glue filling method for the composite material honeycomb sandwich structure comprises the following steps:
s1: laying a strip-shaped foaming adhesive on the die attaching side of the honeycomb core, heating the strip-shaped foaming adhesive and extruding the strip-shaped foaming adhesive into a filling cavity of the honeycomb core;
s2: placing the honeycomb core in S1 on a mold, and laying a single-layer isolation layer between the honeycomb core and the mold;
s3: laying powdery foaming glue on the non-die-attaching side of the honeycomb core in the S2, wherein the powdery foaming glue is filled into a filling cavity of the honeycomb core;
s4: laying down a plurality of insulation layers on the non-molding side of the honeycomb core in S3;
s5: and putting the mould into curing molding equipment to perform heating and curing on the foaming glue according to a preset curing process and preset curing parameters.
Preferably, the strip-shaped foaming adhesive is the same as the powder-shaped foaming adhesive in type.
Preferably, the material of the isolation layer is a breathable material.
Preferably, the material of the honeycomb core is aramid paper.
Preferably, the curing temperature of the strip-shaped foaming adhesive is T1, the curing temperature of the powdery foaming adhesive is T2, T1 is T2, and T1 is more than 120 ℃ and less than or equal to 180 ℃.
Preferably, the curing temperature of the honeycomb core is T3, and T3 ≦ T1.
Preferably, the preset curing process is as follows: vacuumizing at normal temperature, pressurizing, vacuumizing, heating, preserving heat and cooling.
Preferably, the preset curing parameters are: pressurizing to 0.15MPa, heating to T1, keeping the temperature for 1-3 h, and cooling to below 60 ℃.
Preferably, the curing and molding equipment is an autoclave.
In conclusion, the foam rubber filling method for the composite material honeycomb sandwich structure has the following beneficial effects:
1. the honeycomb core is foamed independently, a pre-bonding step is omitted, and the honeycomb core can be directly co-bonded or co-cured with the outer skin and the inner skin after foaming is finished, so that the procedures of pre-bonding and then foaming are eliminated, and the residual stress generated by pre-bonding is eliminated.
2. The foaming glue is not pre-bonded, so that the foaming glue is not easy to wrap in the process of filling the foaming glue, the filling rate of the foaming glue is improved, the outer skin is not pre-bonded, the foaming glue is more convenient to fill, the filling efficiency of the foaming glue is improved, the honeycomb is more convenient to clean after foaming is finished, and the manufacturing cost of the composite material honeycomb sandwich structure is saved.
3. The upper surface and the lower surface are paved with the breathable isolation layers, so that the roughness of the foaming surface of the honeycomb core is improved, and the bonding performance is improved.
4. The preset curing parameters are adopted, so that the overflow of the foaming adhesive is avoided, the curing temperature of the strip-shaped foaming adhesive and the powder foaming adhesive is higher than that of the honeycomb core, the secondary foaming of the strip-shaped foaming adhesive and the powder foaming adhesive is avoided, and the gluing quality is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of the foam filling method for the composite honeycomb sandwich structure of the present invention.
Isolation layer 1, banded foaming adhesive 2, honeycomb core 3, likepowder foaming adhesive 4, mould 5.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, alterations, and improvements in the parts, components, and connections without departing from the spirit of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 shows a foam filling method for a composite material honeycomb sandwich structure according to an embodiment of the present invention, in which a honeycomb core 3 is oppositely disposed with a mold-attaching side and a non-mold-attaching side in a thickness direction (up-down direction as shown in fig. 1) of the honeycomb core 3, and the honeycomb core 3 has a filling cavity therein, the foam filling method for a composite material honeycomb sandwich structure includes the following steps:
s1: and (2) laying the strip-shaped foaming adhesive 2 on the die attaching side of the honeycomb core 3, and heating and extruding the strip-shaped foaming adhesive 2 into a filling cavity of the honeycomb core 3. Specifically, the heating manner of the band-shaped foaming adhesive 2 can be heating by using an iron. It is to be understood that the heating manner of the band-shaped foaming adhesive 2 in the present application is not limited thereto.
S2: the honeycomb core 3 in S1 is placed on the mold 5, and the single-layer insulating layer 1 is laid between the honeycomb core 3 and the mold 5. As shown in fig. 1, the spacer layer 1 is laid on the lower end surface of the honeycomb core 3 or on the upper end surface of the mold 5.
S3: laying powdery foaming glue 4 on the non-die-attaching side of the honeycomb core 3 in the step S2, and filling the powdery foaming glue 4 into a filling cavity of the honeycomb core 3;
s4: in S3, a plurality of layers of insulation 1 are laid on the non-molding side of the honeycomb core 3. As shown in fig. 1, a plurality of insulating layers 1 are laid on the upper end face of a honeycomb core 3.
S5: and putting the mould 5 into curing and forming equipment to perform heating and curing on the foaming adhesive according to a preset curing process and preset curing parameters.
According to the foam adhesive filling method for the composite material honeycomb sandwich structure, disclosed by the embodiment of the invention, the honeycomb core 3 is independently foamed and can be directly subjected to co-bonding or co-curing with the outer skin and the inner skin after the foaming process is finished, so that the residual stress generated by the foaming adhesive and curing shrinkage, which is caused by the processes of pre-bonding and foaming after the foaming process is carried out and only one side of the foaming surface is bound and the other side of the foaming surface is not bound, is eliminated. The process has the advantages that the pre-bonding process is not carried out, the foaming glue is not easy to wrap in the process of filling the foaming glue, the filling rate of the foaming glue is improved, the outer skin is not pre-bonded, the filling of the foaming glue is more convenient, the filling efficiency of the foaming glue is improved, the honeycomb core 3 is more convenient to clean after foaming is finished, and the manufacturing cost of the composite material honeycomb sandwich structure is saved. The upper and lower surfaces are paved with the breathable isolating films, so that the roughness of the foaming surface of the honeycomb core 3 is improved, and the improvement of the bonding performance is improved. By adopting the process parameters, the overflow of the foaming adhesive is avoided, the curing temperature of the strip-shaped foaming adhesive 2 and the powdery foaming adhesive 4 is higher than that of the honeycomb core 3, the secondary foaming of the strip-shaped foaming adhesive 2 and the powdery foaming adhesive 4 is avoided, and the bonding quality is improved.
In some embodiments, the kinds of the strip-shaped foaming adhesive 2 and the powdered foaming adhesive 4 are the same, and it is understood that the kinds of the strip-shaped foaming adhesive 2 and the powdered foaming adhesive 4 can be selected according to actual needs, and the kinds of the strip-shaped foaming adhesive 2 and the powdered foaming adhesive 4 in the present application are not particularly limited.
In some embodiments, the barrier layer 1 is a breathable material and the honeycomb core 3 is aramid paper. The material of the honeycomb core 3 in the present application is not limited thereto, and may be, for example, an aluminum honeycomb.
In some embodiments, the curing temperature of the tape-shaped foaming adhesive 2 is T1, the curing temperature of the powdery foaming adhesive 4 is T2, T1 is T2, and 120 ℃ ≦ T1 ≦ 180 ℃.
In some embodiments, the curing temperature of the honeycomb core 3 is T3, and T3 ≦ T1.
In some embodiments, the predetermined curing process is: vacuumizing at normal temperature, pressurizing, vacuumizing, heating, preserving heat and cooling. The preset curing parameters are as follows: pressurizing to 0.15MPa, heating to T1, keeping the temperature for 1-3 h, and cooling to below 60 ℃. It is to be understood that the preset curing parameters in the present application are not limited thereto, and the specific curing parameters may be adjusted according to the kind of the band-shaped foaming glue 2, the kind of the powdery foaming glue 4, and the material of the honeycomb core 3.
In some embodiments, the cure molding apparatus is an autoclave. It is to be understood that the curing molding apparatus in the present application is not limited thereto.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For embodiments of the method, reference is made to the description of the apparatus embodiments in part. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The above description is only an example of the present application and is not limited to the present application. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (9)
1. A foam rubber filling method for a composite material honeycomb sandwich structure, wherein a die attaching side and a non-die attaching side are oppositely arranged on a honeycomb core in the thickness direction of the honeycomb core, and a filling cavity is arranged in the honeycomb core, and the foam rubber filling method for the composite material honeycomb sandwich structure is characterized by comprising the following steps of:
s1: laying a strip-shaped foaming adhesive on the die attaching side of the honeycomb core, heating the strip-shaped foaming adhesive and extruding the strip-shaped foaming adhesive into a filling cavity of the honeycomb core;
s2: placing the honeycomb core in S1 on a mold, and laying a single-layer isolation layer between the honeycomb core and the mold;
s3: laying powdery foaming glue on the non-die-attaching side of the honeycomb core in the S2, wherein the powdery foaming glue is filled into a filling cavity of the honeycomb core;
s4: laying down a plurality of insulation layers on the non-molding side of the honeycomb core in S3;
s5: and putting the mould into curing molding equipment to perform heating and curing on the foaming glue according to a preset curing process and preset curing parameters.
2. The method for filling foam rubber for a composite material honeycomb sandwich structure according to claim 1, wherein the belt-shaped foam rubber is the same as the powdery foam rubber in type.
3. The method of claim 1, wherein the material of the isolation layer is a gas permeable material.
4. The method for filling foam rubber for the composite material honeycomb sandwich structure according to claim 1, wherein the material of the honeycomb core is aramid paper.
5. The method for filling foam rubber for a composite material honeycomb sandwich structure according to claim 1, wherein the curing temperature of the strip-shaped foam rubber is T1, the curing temperature of the powdery foam rubber is T2, T1 is T2, and T1 is 120 ℃ and 180 ℃.
6. The method of claim 5, wherein the curing temperature of the honeycomb core is T3, and T3 ≦ T1.
7. The method for filling foam rubber for the composite material honeycomb sandwich structure according to claim 5, wherein the preset curing process is as follows: vacuumizing at normal temperature, pressurizing, vacuumizing, heating, preserving heat and cooling.
8. The foam rubber filling method for the composite material honeycomb sandwich structure according to claim 7, wherein the preset curing parameters are as follows: pressurizing to 0.15MPa, heating to T1, keeping the temperature for 1-3 h, and cooling to below 60 ℃.
9. The foam rubber filling method for the composite material honeycomb sandwich structure according to claim 1, wherein the curing and forming device is an autoclave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110015947.XA CN112829161B (en) | 2021-01-07 | 2021-01-07 | Foaming glue filling method for composite material honeycomb sandwich structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110015947.XA CN112829161B (en) | 2021-01-07 | 2021-01-07 | Foaming glue filling method for composite material honeycomb sandwich structure |
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| CN112829161A true CN112829161A (en) | 2021-05-25 |
| CN112829161B CN112829161B (en) | 2022-10-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113997654A (en) * | 2021-11-05 | 2022-02-01 | 中车青岛四方机车车辆股份有限公司 | Sound insulation composite board and manufacturing method and application thereof |
| CN114379121A (en) * | 2021-11-24 | 2022-04-22 | 中国南方航空股份有限公司 | Engine reverse thrust sliding door inner cylinder front honeycomb sandwich structure repair process |
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| CN110744872A (en) * | 2019-11-04 | 2020-02-04 | 中国航空工业集团公司基础技术研究院 | Composite material honeycomb sandwich structure and foaming glue filling method used in same |
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| US5580502A (en) * | 1995-03-23 | 1996-12-03 | Sikorsky Aircraft Corporation | Method of fabricating a composite article having an integral, co-cured composite stiffening member |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114379121A (en) * | 2021-11-24 | 2022-04-22 | 中国南方航空股份有限公司 | Engine reverse thrust sliding door inner cylinder front honeycomb sandwich structure repair process |
| CN114379121B (en) * | 2021-11-24 | 2023-07-07 | 中国南方航空股份有限公司 | Repairing process for honeycomb sandwich structure at front part of inner cylinder of engine thrust-reversing translation door |
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| Publication number | Publication date |
|---|---|
| CN112829161B (en) | 2022-10-21 |
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