A potting device and method for a honeycomb sandwich structure composite part

Abstract

The present invention discloses a potting device and method for a honeycomb sandwich structure composite material part. The potting device includes a honeycomb sandwich structure composite material part to be potted and a potting forming auxiliary tooling; the honeycomb sandwich structure composite material part to be potted is located on the potting forming auxiliary tooling, and the potting forming auxiliary tooling is used to adjust the state of the honeycomb sandwich structure composite material part to be potted, adjust its potting area to be horizontal, prevent the horizontal tolerance deviation of the potting area of the workpiece from being too large and difficult to be completely filled. At the same time, exhaust holes are drilled at the outer edge of the potting area to ensure the discharge of the entrapped air, and a rubber dam is pasted at the outer edge of the opening of the potting area to increase the liquid level height of the potting adhesive and ensure that the potting adhesive is completely filled. The potting method of the present invention can achieve the preparation of large-size honeycomb core parts with high quality and high qualification rate, laying a foundation for the subsequent manufacture of qualified honeycomb sandwich structure composite material parts.

Description

Technical Field

[0001] The present invention relates to a potting device and method for a composite part with a honeycomb sandwich structure. Background Art

[0002] A composite part with a honeycomb sandwich structure is a composite part made of two high-strength composite material panels on the upper and lower sides sandwiching a honeycomb core. Due to its advantages such as light weight, high bending strength and stiffness, strong anti-buckling ability, resistance to fatigue aging, good sound absorption, sound insulation and heat insulation performance, it has been widely used at present. Especially in the aerospace field, composite materials with honeycomb sandwich structures have been widely used in aircraft structures, such as wings, fuselages, tails, radomes, floors, interior decorations, etc. The honeycomb sandwich structure has become one of the indispensable structural materials in this field with its excellent performance.

[0003] When there is an assembly relationship in the honeycomb area of a composite material honeycomb sandwich structure part, in order to prevent damage to the sandwich structure part and improve the mechanical properties of the part at the same time, it is necessary to pot the honeycomb area. However, for the potting of the honeycomb area of a honeycomb sandwich structure part, due to the large number of cell grids in the honeycomb and the curvature of some parts, it is difficult to completely fill the potting area; in addition, due to the gas wrapped in during potting, a large number of pores are easily generated inside the potting adhesive, affecting the potting and assembly quality of the honeycomb sandwich structure part. Summary of the Invention

[0004] In view of the above problems, the present application provides a potting device and method for a composite part with a honeycomb sandwich structure, which adopts a potting auxiliary device and the method of drilling exhaust holes to solve the problems that the honeycomb sandwich potting is difficult to be completely filled and pores are caused by the wrapped air. The specific technical solutions are as follows:

[0005] First of all, the present invention provides a potting device for a composite part with a honeycomb sandwich structure, including a composite part with a honeycomb sandwich structure to be potted and a potting forming auxiliary tooling; the composite part with a honeycomb sandwich structure to be potted is located on the potting forming auxiliary tooling, and the potting forming auxiliary tooling is used to adjust the state of the composite part with a honeycomb sandwich structure to be potted and adjust its potting area to be horizontal.

[0006] In the above-mentioned potting device for a composite part with a honeycomb sandwich structure, the composite part with a honeycomb sandwich structure to be potted is a cured part, which includes an upper skin, a honeycomb core and a lower skin; the upper skin is provided with a potting opening and an exhaust hole.

[0007] In the above-mentioned potting device for a composite part with a honeycomb sandwich structure, it further includes a rubber dam, and the rubber dam is arranged around the upper surface of the potting area of the composite part with a honeycomb sandwich structure to be potted, and its height exceeds the height of the potting area horizontal plane.

[0008] Preferably, for the aforementioned potting device for honeycomb sandwich structure composite parts, the rubber blocking strip includes a sealing rubber strip and a rubber blocking strip isolation film wrapped around the sealing rubber strip.

[0009] For the aforementioned potting device for honeycomb sandwich structure composite parts, there are a plurality of exhaust holes, which are equidistantly distributed within a range of 10 mm from the outer edge of the potting area.

[0010] Preferably, for the aforementioned potting device for honeycomb sandwich structure composite parts, the diameter of the exhaust holes is less than 3 mm.

[0011] For the aforementioned potting device for honeycomb sandwich structure composite parts, the potting forming auxiliary tooling includes an auxiliary tooling seat and an auxiliary support rod; the auxiliary support rod is a telescopic rod, which is arranged on the auxiliary tooling seat and is used to support and adjust the state of the potting area of the honeycomb sandwich structure composite part to be potted.

[0012] Secondly, the present invention provides a potting method for honeycomb sandwich structure composite parts, including the following steps:

[0013] S1: Process and cure the honeycomb sandwich structure composite part to be potted according to requirements;

[0014] S2: Drill potting openings and exhaust holes on the upper skin of the honeycomb sandwich structure composite part to be potted, and remove the honeycomb core in the potting area of the honeycomb sandwich structure composite part to be potted as required;

[0015] S3: Paste a rubber blocking strip on the outer edge of the potting area of the honeycomb sandwich structure composite part to be potted;

[0016] S4: Place the honeycomb sandwich structure composite part to be potted on the potting forming auxiliary tooling, and adjust the potting area of the honeycomb sandwich structure composite part to be potted to be horizontal by adjusting the auxiliary support rod;

[0017] S5: Slowly and evenly fill the potting area of the honeycomb sandwich structure composite part to be potted with potting glue through the potting opening;

[0018] S6: Paste sealing rubber strips on both sides of the exhaust holes on the upper skin of the honeycomb sandwich structure composite part to be potted, and sequentially lay an exhaust hole isolation film, a breathable felt, and a vacuum bag on the exhaust holes, and then perform vacuum pumping;

[0019] S7: After vacuum pumping is completed, remove the encapsulation materials, cure the potting glue, and after the potting glue is cured, process through holes for assembly.

[0020] Preferably, in the honeycomb sandwich structure composite part potting method described above, in step S2, the honeycomb core in the potting area of the honeycomb sandwich structure composite part to be potted is removed by using a "┴"-shaped or "L"-shaped machining tool.

[0021] Preferably, in the honeycomb sandwich structure composite part potting method described above, in step S6, the vacuum pumping is performed by using incomplete vacuum pumping, and the vacuum degree does not exceed 0.08 MPa. When all the exhaust holes are blocked by the potting adhesive, the vacuum pumping stops.

[0022] Advantages of the present invention:

[0023] 1) In the present invention, exhaust holes are drilled equidistantly within a certain range from the outer edge of the potting area to ensure the discharge of the entrapped air.

[0024] 2) In the present invention, a "┴"-shaped or "L"-shaped tool is used to remove the honeycomb in the potting area of the honeycomb sandwich structure part, making it possible to remove the honeycomb in the potting area, reducing the difficulty of honeycomb processing, and improving the processing quality.

[0025] 3) In the present invention, only the potting opening is processed on the upper skin of the workpiece, and the lower skin is retained, greatly improving the potting efficiency and potting quality.

[0026] 4) In the present invention, an auxiliary adjustment tooling is used to adjust the placement state of the workpiece to prevent large horizontal tolerance deviations in the potting area of the workpiece, making it difficult to completely fill.

[0027] 5) In the present invention, a glue-blocking strip is pasted on the outer edge of the opening in the potting area to increase the liquid level height of the potting adhesive and ensure complete filling of the potting adhesive.

[0028] 6) In the present invention, the exhaust holes are evacuated to remove air holes and bubbles and promote the flow of the potting adhesive.

[0029] Therefore, the honeycomb potting method of the present invention can achieve the preparation of large-size honeycomb core parts with high quality and high qualification rate, laying a foundation for the subsequent manufacture of qualified honeycomb sandwich structure composite parts. Description of the Drawings

[0030] Figure 1 Schematic diagram of the honeycomb sandwich structure composite part to be potted according to the present invention;

[0031] Figure 2 Schematic diagram of the potting area according to the present invention;

[0032] Figure 3 Schematic cross-sectional diagram of the potting device according to the present invention;

[0033] Figure 4 Schematic diagram of the exhaust hole sealing according to the present invention.

[0034] In the figure: 1. Honeycomb sandwich structure composite part to be potted; 10. Potting area; 101. Potting opening; 11. Upper skin; 12. Honeycomb core; 2. Potting forming auxiliary tooling; 21. Auxiliary tooling seat; 22. Auxiliary support rod; 3. Glue stop strip; 31. Sealing rubber strip; 32. Glue stop strip isolation film; 4. Vent hole; 41. Vent hole isolation film; 42. Breathable felt; 43. Vacuum bag; 5. Through hole. Specific implementation mode

[0035] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments and the drawings. Obviously, the described embodiments are only the preferred embodiments of the present invention, not all of the embodiments, nor are they other forms of limitation to the present invention. Any person skilled in the art may make changes or equivalent changes using the disclosed technical content. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution content of the present invention still fall within the protection scope of the technical solution of the present invention.

[0036] Embodiment 1

[0037] In this embodiment, the area of the honeycomb sandwich structure composite part that needs to be assembled and drilled is potted. First, this embodiment provides a potting device, as Figures 1 to 4 shown, including the honeycomb sandwich structure composite part 1 to be potted and the potting forming auxiliary tooling 2; the honeycomb sandwich structure composite part 1 to be potted is located on the potting forming auxiliary tooling 2, and the potting forming auxiliary tooling 2 is used to adjust the state of the honeycomb sandwich structure composite part 1 to be potted, and adjust its potting area 10 to be approximately horizontal to prevent the horizontal tolerance deviation of the potting area of the workpiece from being too large and difficult to be completely filled.

[0038] The honeycomb sandwich structure composite part potting device in this embodiment further includes a glue stop strip 3, and the glue stop strip 3 is arranged around the upper surface of the potting area 10 of the honeycomb sandwich structure composite part 1 to be potted, and its height exceeds the height of the horizontal plane of the potting area 10 to increase the liquid level height of the potting glue and ensure that the potting glue is completely filled. The glue stop strip 3 includes a sealing rubber strip 31 and an isolation film 32, and the isolation film 32 is wrapped on the sealing rubber strip 31 to prevent the sealing rubber strip 31 from adhering to the potting glue.

[0039] The honeycomb sandwich structure composite material part 1 to be potted in this embodiment is a cured part, which includes an upper skin 11, a honeycomb core 12 and a lower skin; the upper skin 11 is provided with a potting opening 101 and an exhaust hole 4. There are a plurality of exhaust holes 4, which are equidistantly distributed within a range of 10 mm from the outer edge of the potting area 10, and whose diameter is less than 3 mm, so as to ensure the exhaust of the trapped air, avoid the generation of more pores inside the potting glue, and ensure the potting and assembly quality of the honeycomb sandwich structure.

[0040] In this embodiment, the potting molding auxiliary tooling 2 includes an auxiliary tooling seat 21 and an auxiliary support rod 22; the auxiliary support rod 22 is a telescopic rod, which is arranged on the auxiliary tooling seat 21 to support and adjust the state of the potting area 10 of the honeycomb sandwich structure composite material part 1 to be potted.

[0041] The method for potting a honeycomb sandwich structure composite material part described in this embodiment specifically comprises the following steps:

[0042] S1: Processing and curing the potted honeycomb sandwich structure composite material part according to the requirements, that is, the honeycomb sandwich structure composite material part 1 to be potted.

[0043] S2: Drill potting openings 101 and exhaust holes 4 on the upper skin 11 of the honeycomb sandwich structure composite material part 1 to be potted. There are several exhaust holes 4, which are evenly distributed within 10mm of the outer edge of the potting area 10 and have a diameter of less than 3mm to ensure that the trapped air is discharged. Use a "┴" or "L" type machining tool to remove the honeycomb core 12 of the potting area 10 of the honeycomb sandwich structure composite material part 1 to be potted as required.

[0044] S3: Pasting a rubber strip 3 on the outer edge of the potting area 10 of the honeycomb sandwich structure composite material part 1 to be potted.

[0045] S4: placing the honeycomb sandwich structure composite material part 1 to be potted on the above-mentioned potting molding auxiliary tooling 2, and adjusting the potting area 10 of the honeycomb sandwich structure composite material part 1 to be potted to be horizontal by adjusting the auxiliary support rods 22.

[0046] S5: slowly and evenly filling the potting glue into the potting area 10 of the honeycomb sandwich structure composite material part 1 to be potted through the potting opening 101.

[0047] S6: Paste sealing strips 31 on both sides of the exhaust holes 4 of the upper skin 11 of the honeycomb sandwich structure composite material part 1 to be potted, and lay exhaust hole isolation membrane 41, breathable felt 42 and vacuum bag 43 on the exhaust holes 4 in sequence, and then use incomplete vacuuming to perform vacuuming; the vacuum degree does not exceed 0.08MPa, and the vacuuming stops when all the exhaust holes 4 are blocked by the potting glue.

[0048] S7: After the evacuation is completed, remove the encapsulation material, cure the potting adhesive, and after the potting adhesive is cured, process the through holes 5 for assembly.

[0049] In the present invention, vent holes are drilled equidistantly within a certain range from the outer edge of the potting area to ensure the discharge of the entrapped air; a "┴"-shaped or "L"-shaped tool is used to remove the honeycomb in the potting area of the honeycomb sandwich structure member, making it possible to remove the honeycomb in the potting area, reducing the difficulty of honeycomb processing, and improving the processing quality. The method of the present invention only processes a potting opening on the upper skin of the workpiece, retaining the lower skin, greatly improving the potting efficiency and potting quality. The present invention uses an auxiliary adjustment tooling to adjust the placement state of the workpiece to prevent a large deviation in the horizontal tolerance of the potting area of the workpiece, making it difficult to be completely filled. At the same time, the present invention pastes a glue-blocking strip on the outer edge of the opening in the potting area to increase the liquid level height of the potting adhesive and ensure that the potting adhesive is completely filled; in addition, the present invention evacuates the vent holes to remove air holes and bubbles and promote the flow of the potting adhesive.

[0050] Generally speaking, the honeycomb potting method of the present invention can achieve the preparation of large-size honeycomb core parts with high quality and high qualification rate, laying a foundation for the subsequent manufacture of qualified honeycomb sandwich structure composite parts.

[0051] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

[0052] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A potting method for a composite part with a honeycomb sandwich structure, characterized in that: It includes the following steps: S1: Process and cure the honeycomb sandwich structure composite part (1) to be potted according to requirements; S2: Drill potting openings (101) and exhaust holes (4) on the upper skin (11) of the honeycomb sandwich structure composite part (1) to be potted, and remove the honeycomb core (12) in the potting area (10) of the honeycomb sandwich structure composite part (1) to be potted as required; S3: Paste a rubber stop strip (3) on the outer edge of the potting area (10) of the honeycomb sandwich structure composite part (1) to be potted; S4: Place the honeycomb sandwich structure composite part (1) to be potted on the potting forming auxiliary tooling (2), and adjust the potting area (10) of the honeycomb sandwich structure composite part (1) to be horizontal by adjusting the auxiliary support rod (22); S5: Slowly and evenly fill the potting area (10) of the honeycomb sandwich structure composite part (1) to be potted with potting glue through the potting opening (101); S6: Paste sealant strips (31) on both sides of the exhaust holes (4) on the upper skin (11) of the honeycomb sandwich structure composite part (1) to be potted, and sequentially lay an exhaust hole isolation film (41), a breathable felt (42) and a vacuum bag (43) on the exhaust holes (4), and then perform vacuum pumping; S7: After the vacuum pumping is completed, remove the packaging material, cure the potting glue, and after the potting glue is cured, machine a through hole (5) for assembly.

2. The potting method for the honeycomb sandwich structure composite material part according to claim 1, characterized in that: In step S2, the honeycomb sandwich structure composite part (1) to be potted is a cured part, which also includes a lower skin, and the honeycomb core (12) is filled between the upper skin (11) and the lower skin.

3. The potting method for the honeycomb sandwich structure composite material part according to claim 1, wherein: In step S2, there are several exhaust holes (4), which are evenly distributed within a range of 10 mm from the outer edge of the potting area (10).

4. The potting method of the honeycomb sandwich structure composite material part according to claim 3, characterized in that: The diameter of the exhaust hole (4) is less than 3 mm.

5. The potting method for the honeycomb sandwich structure composite part according to claim 1, characterized in that: In step S2, the honeycomb core (12) in the potting area (10) of the honeycomb sandwich structure composite part (1) to be potted is removed as required by using a "┴”-shaped or "L”-shaped machining tool.

6. The potting method for the honeycomb sandwich structure composite part according to claim 1, wherein: In step S3, the rubber stop strip (3) is arranged around the upper surface of the potting area (10) of the honeycomb sandwich structure composite part (1) to be potted, and its height exceeds the height of the horizontal plane of the potting area (10).

7. The potting method for the honeycomb sandwich structure composite material part according to claim 1, characterized in that: In step S4, the forming auxiliary tooling (2) further includes an auxiliary tooling seat (21), and the auxiliary support rod (22) is arranged on the auxiliary tooling seat (21).

8. The potting method for the honeycomb sandwich structure composite part according to claim 1 or 7, characterized in that: In step S4, the auxiliary support rod (22) is a telescopic rod.

9. The potting method for the honeycomb sandwich structure composite material part according to claim 1, characterized in that: In step S6, the sealant strip (31) is wrapped with a rubber stop strip isolation film (32).

10. The potting method for a honeycomb sandwich structure composite material part according to claim 1, characterized in that: In step S6, the vacuum pumping is an incomplete vacuum pumping, and the vacuum degree does not exceed 0.08 MPa. When all the exhaust holes (4) are blocked by the potting glue, the vacuum pumping stops.

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