Positioning method for solving axis tolerance of composite material long-beam stiffened co-bonding wall plate

Abstract

The application discloses a positioning method for solving the axis tolerance of a composite material work-shaped stringer reinforced co-bonding wallboard, which comprises the following steps: work-shaped stringer positioning, work-shaped stringer position degree checking, pressure pad placement and adaptation, pre-extraction, encapsulation and solidification forming and the like. The axis of the composite material work-shaped stringer reinforced co-bonding wallboard manufactured by the method is qualified; and the forming quality of the parts is improved, and the axis tolerance problem of the composite material work-shaped stringer reinforced co-bonding wallboard is solved in the most convenient way.

Description

Technical Field

[0001] This invention relates to a molding method for a composite material I-shaped reinforced co-bonded wall panel. Background Technology

[0002] Composite I-beam reinforced co-bonded panel typically consists of a skin and several I-beams of varying shapes. The skin and I-beams are bonded together with structural adhesive to form an integrated panel. Currently, I-beam reinforced co-bonded panel has been used in certain types of vertical tail panels, horizontal tail panels, and other components, playing an important role in the field of composite materials.

[0003] Due to the high elastic modulus and strength of the assembled skin layer, its structure possesses characteristics such as high strength, high modulus, low density, and small coefficient of linear expansion, making it a material with excellent mechanical properties. I-beam reinforced co-bonded wall panels are a common reinforcing structure in composite material components. Compared to mechanical riveting, I-beam reinforced co-bonded wall panels offer advantages such as high strength, low specific gravity, and low cost, thus finding widespread application in aerospace main load-bearing structures.

[0004] Structural adhesives, due to their low viscosity and high fluidity during high-temperature curing, are prone to slippage in I-beams. This slippage affects the axial alignment of the I-beams, complicating subsequent assembly. Summary of the Invention

[0005] The purpose of this invention is to provide a positioning method for solving the problem of out-of-tolerance axis of composite material I-beam stiffened co-bonded wall panels, thereby manufacturing composite material I-beam stiffened co-bonded wall panel parts with qualified axis.

[0006] To solve the above-mentioned technical problems, the present invention provides a positioning method for resolving the out-of-tolerance axis of composite material I-beam stiffened co-bonded wall panels, comprising the following steps:

[0007] S1: I-beam long stringer positioning, multiple wall panels are placed sequentially in the positioning area of ​​the positioning fixture, and the I-beam long stringer of each wall panel is positioned through the corresponding positioning hole in the positioning area, and the I-beam long stringer is positioned one by one by using pins through the positioning holes.

[0008] S2: I-beam positional check. After positioning, use projection to check whether the outer I-beam is offset outward by 0.5-1.2mm. After the check, press the top edge of the I-beam by hand to keep it relatively stable and remove the pins.

[0009] S3: Placement and fitting of pressure pads: Cover the skin on both sides of the I-beam long stringer with pressure pads, and control the gap between the pressure pads and the adjacent I-beam long stringers to be within the range of 0.3-1.2mm; after fitting, the two outer pressure pads need to be fixed with pressure-sensitive tape.

[0010] S4: Pre-vacuuming, pre-vacuuming the wall plate with the pressure pad in place, the pre-vacuuming time must be greater than or equal to 5 minutes, and the vacuum degree must be not less than 80 kPa;

[0011] S5: Encapsulation, encapsulating the positioned connecting plate, using a non-porous isolation film to cover all I-shaped stringers and the skin surface where the pressure pad is placed in the same positioning area;

[0012] Among them, an N4 breathable felt needs to be placed on the surface of the non-porous isolation membrane; two N10 breathable felts need to be placed on the surface of the skin, with the two N10 breathable felts placed between the pressure pad and the non-porous isolation membrane; and a 1332 breathable felt needs to be placed on top of the skin, with the 1332 breathable felt placed on top of the N4 breathable felt.

[0013] Finally, vacuum bags and sealing strips are used for sealing.

[0014] S6: Curing and molding. The packaged wall panel and positioning fixture are sent into the autoclave for curing and molding. The autoclave is heated at 180±6℃ for at least 120 minutes. The back pressure in the vacuum bag must be maintained within the range of 0MPa-0.034MPa.

[0015] S7: Demolding. After being removed from the can, the mold is removed to obtain the I-shaped long stringer reinforced co-bonded wall panel that meets the requirements of the axial composite design.

[0016] Preferably, when positioning the I-beam, the positioning holes in the positioning area are distributed sequentially along the chord of the I-beam, and the I-beam is positioned one by one by using pins through the positioning holes.

[0017] Preferably, the outer positioning hole in the positioning area is offset outward by 0.5-1.2 mm along the chord direction of the stringer, while the position of the middle positioning hole remains unchanged.

[0018] Preferably, the outer positioning hole is offset outward by 0.8 mm along the chord direction of the stringer.

[0019] Preferably, the positioning fixture is an Invar steel fixture, the thickness of the adhesive surface with the connecting plate is greater than 2mm, and a positioning hole with a diameter of 6.35mm is pre-machined.

[0020] Preferably, the I-beam long stringer is pre-machined with through holes of 6.35 mm in diameter, which correspond one-to-one with the positioning fixtures.

[0021] Preferably, the non-porous isolation membrane covering the I-shaped stringer is done by punching holes, that is, punching holes in the I-shaped stringer to expose it, and then covering the I-shaped stringer with a non-porous isolation membrane.

[0022] Preferably, in the positional verification of the I-beam long girder, the positioning fixture design should reserve projection target holes; after the connecting plate and the positioning fixture are tangentially matched in CATIA digital model, the projection is created using projection software Virtek.

[0023] Preferably, the pressure pad used in the placement and fitting of the pressure pad should be a soft pressure pad, which is made of rubber and prepreg cured together.

[0024] Preferably, the connecting plate formed by the I-beam stringer and the skin is bonded to the positioning fixture using a structural adhesive, wherein the structural adhesive is a high-temperature resistant structural adhesive.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. The composite material I-beam stiffened co-bonded wall panel manufactured according to the method of the present invention has qualified axis; thereby improving the molding quality of such parts and solving the long-standing problem of out-of-tolerance axis of composite material I-beam stiffened co-bonded wall panels in the most convenient way.

[0027] 2. The positioning fixture offsets the outermost positioning hole outward along the chord of the stringer by 0.5-1.2mm. During positioning, the positioning hole reserved in advance in the allowance area of ​​the I-shaped stringer is matched with the offset positioning hole on the positioning fixture. This compensates for the amount of displacement of the outermost I-shaped stringer due to uneven stress in the bag, thereby producing parts with qualified axes.

[0028] 3. In this method, when adapting the pressure pad, the gap between the adapted pressure pad and the axis of the I-shaped stringer should be controlled between 0.3mm and 0.8mm. The outermost pressure pad needs to be fixed with pressure-sensitive tape to prevent it from slipping and affecting the axis of the I-shaped stringer. Attached Figure Description

[0029] Figure 1 This is a positioning diagram of the connecting plate provided by the present invention on the positioning fixture;

[0030] Figure 2 This is a schematic diagram of the positioning fixture provided by the present invention;

[0031] Figure 3 This is a cross-sectional schematic diagram of the connecting plate and positioning fixture provided by the present invention.

[0032] In the diagram: 1. Connecting panel; 2. Positioning fixture; 3. Positioning hole; 4. Pressure pad; 5. Non-porous isolation membrane; 6. N4 breathable felt; 7. N10 breathable felt; 8. 1332 breathable felt; 9. Vacuum bag; 101. I-beam long stringer; 102. Skin; 301. Outer positioning hole; 302. Middle positioning hole. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0034] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances. Example

[0036] This invention provides a positioning method for resolving axial deviation issues in composite material I-beam reinforced bonded wall panels. Please refer to [link to relevant documentation]. Figure 1-3 It includes the following steps:

[0037] S1: I-beam long stringer positioning, multiple connecting plates 1 are placed sequentially in the positioning area of ​​the positioning fixture 2, and the I-beam long stringer 101 of each connecting plate 1 is positioned through the corresponding positioning hole 3 in the positioning area, and the I-beam long stringer 101 is positioned one by one by using pins to penetrate the positioning hole 3.

[0038] S2: I-beam positional check. After positioning, use projection to check whether the outer I-beam 101 is offset outward by 0.5-1.2mm. After the check, press the top edge of the I-beam 101 by hand to keep it relatively stable and remove the pin.

[0039] S3: Placement and fitting of pressure pads: Cover the skins 102 on both sides of the I-beam 101 with pressure pads 4, and control the gap between pressure pads 4 and adjacent I-beam 101 to be 0.3-1.2mm; after fitting, the two outer pressure pads 4 need to be fixed with pressure-sensitive adhesive tape; this not only ensures appearance quality and non-destructive quality, but also limits the I-beam 101 in the middle of the wall panel 1, preventing it from slipping due to the decrease in viscosity of the structural adhesive under high temperature and pressure;

[0040] S4: Pre-vacuuming, pre-vacuuming is performed on the connecting plate 1 with the pressure pad 4 placed thereon. The pre-vacuuming time must be greater than or equal to 5 minutes and the vacuum degree must be not less than 80 kPa.

[0041] S5: Encapsulation, the positioned connecting plate 1 is encapsulated, and a non-porous isolation film 5 is used to cover all the I-shaped stringers 101 and the surface of the skin 102 where the pressure pad 4 is placed in the same positioning area.

[0042] Specifically, an N4 breathable felt 6 needs to be placed on the surface of the non-porous isolation membrane 5; two N10 breathable felts 7 need to be placed on the surface of the skin 102, with the two N10 breathable felts 7 placed between the pressure pad 4 and the non-porous isolation membrane 5; and a 1332 breathable felt 8 needs to be placed on top of the skin 102, with the 1332 breathable felt 8 placed on top of the N4 breathable felt 6 (wherein, the N4 breathable felt is the thinnest, followed by the N10, and the 1332 breathable felt is the thickest).

[0043] Finally, vacuum bags 9 are used in conjunction with sealing strips for sealing.

[0044] S6: Curing and molding. The packaged wall panel 1 and positioning fixture 2 are sent into the autoclave for curing and molding. The curing is carried out at 180±6℃ for at least 120 minutes. The back pressure in the vacuum bag 9 must be maintained within the range of 0MPa-0.034MPa.

[0045] S7: Demolding. After being removed from the can, the mold is removed to obtain the I-shaped long stringer reinforced co-bonded wall panel that meets the requirements of the axial composite design.

[0046] The composite material I-beam stiffened co-bonded wall panel manufactured according to the method of the present invention has a qualified axis; thereby improving the molding quality of such parts and solving the long-standing problem of out-of-tolerance axis of composite material I-beam stiffened co-bonded wall panels in the most convenient way.

[0047] Specifically, when positioning the I-beam truss, the positioning holes 3 in the positioning area are distributed sequentially along the chord direction of the truss, and the I-beam truss 101 is positioned one by one by using pins through the positioning holes 3. Among them, the outer positioning hole 301 in the positioning area is offset outward by 0.5-1.2mm along the chord direction of the truss, while the position of the middle positioning hole 302 remains unchanged.

[0048] In a preferred embodiment, the outer positioning hole 301 is offset outward by 0.8 mm along the chord direction of the stringer.

[0049] Specifically, the positioning fixture 2 is an Invar steel fixture, the thickness of the adhesive surface with the connecting plate 1 is greater than 2mm, and a positioning hole 3 with a diameter of 6.35mm is pre-machined, and the I-beam truss 101 is pre-machined with a through hole with a diameter of 6.35mm corresponding to the positioning fixture 2.

[0050] Specifically, the non-porous isolation membrane 5 is covered on the I-shaped stringer 101 by a perforation method, that is, a hole is made in the I-shaped stringer 101 to expose it, and then a non-porous isolation membrane 5 is covered on the I-shaped stringer 101.

[0051] Specifically, in the positional verification of the I-beam long girder, the positioning fixture 2 needs to be designed with a reserved projection target hole; after the connecting plate 1 and the positioning fixture 2 are tangentially matched in the CATIA digital model, the projection is made using the projection software Virtek. The projection is to convert the lines marked on the digital model into actual production through Virtek software.

[0052] Specifically, the pressure pad 4 used in the placement and fitting of the pressure pad must be a soft pressure pad, which is made of rubber and prepreg cured together.

[0053] Specifically, the connecting plate 1 formed by the I-beam truss 101 and the skin 102 is bonded to the positioning fixture 2 using a structural adhesive, wherein the structural adhesive is a high-temperature resistant structural adhesive.

[0054] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A positioning method for solving the problem of out-of-tolerance axis deviation in composite material I-beam long stringer reinforced co-bonded wall panels, characterized in that, Includes the following steps: S1: I-beam long stringer positioning, multiple connecting plates (1) are placed sequentially in the positioning area of ​​the positioning fixture (2), and the I-beam long stringer (101) of each connecting plate (1) is positioned through the corresponding positioning hole (3) in the positioning area, and the I-beam long stringer (101) is positioned one by one by using a pin through the positioning hole (3); the outer positioning hole (301) in the positioning area is offset outward along the chord direction of the long stringer by 0.5-1.2mm, while the position of the middle positioning hole (302) remains unchanged; S2: I-beam position verification. After positioning, use projection to verify whether the outer I-beam (101) is offset outward by 0.5-1.2mm. After verification, press the top edge of the I-beam (101) by hand to keep it relatively stable and remove the pin. S3: Placement and fitting of pressure pads: Cover the skin (102) on both sides of the I-beam (101) with pressure pads (4) and control the gap between pressure pads (4) and adjacent I-beams (101) to be 0.3-1.2mm; After fitting, the two outer pressure pads (4) need to be fixed with pressure-sensitive tape. S4: Pre-extraction, pre-extraction is performed on the wall plate (1) with the pressure pad (4) in place. The pre-extraction time must be greater than or equal to 5 minutes and the vacuum degree must be not less than 80 kPa. S5: Encapsulation, the positioned connecting plate (1) is encapsulated, and a non-porous isolation film (5) is used to cover all the I-shaped stringers (101) and the skin (102) surface where the pressure pad (4) is placed in the same positioning area; Among them, an N4 breathable felt (6) needs to be placed on the surface of the non-porous isolation membrane (5); two N10 breathable felts (7) need to be placed on the surface of the skin (102), and the two N10 breathable felts (7) are placed between the pressure pad (4) and the non-porous isolation membrane (5); a 1332 breathable felt (8) needs to be placed on top of the skin (102), and the 1332 breathable felt (8) is placed on top of the N4 breathable felt (6); Finally, vacuum bags (9) and sealing strips are used for sealing; S6: Curing and molding, the packaged wall panel (1) and positioning fixture (2) are sent into the autoclave for curing and molding. The curing is carried out at 180±6℃ for at least 120 minutes. The back pressure in the vacuum bag (9) must be maintained within the range of 0MPa-0.034MPa. S7: Demolding. After being removed from the can, the mold is removed to obtain the I-shaped long stringer reinforced co-bonded wall panel that meets the requirements of the axial composite design.

2. The positioning method for solving the problem of out-of-tolerance axis of composite material I-beam long stringer reinforced co-bonded wall panel as described in claim 1, characterized in that, When positioning the I-shaped girder, the positioning holes (3) in the positioning area are distributed sequentially along the chord of the girder, and the I-shaped girder (101) is positioned one by one by using pins to penetrate the positioning holes (3).

3. The positioning method for solving the problem of out-of-tolerance axis of composite material I-beam long stringer reinforced co-bonded wall panel as described in claim 2, characterized in that, The outer positioning hole (301) is offset outward by 0.8 mm along the chord direction of the stringer.

4. The positioning method for solving the problem of out-of-tolerance axis of composite material I-beam long stringer reinforced co-bonded wall panel as described in claim 2, characterized in that, The positioning fixture (2) is an Invar steel fixture, with a bonding surface thickness of more than 2 mm with the connecting plate (1), and a positioning hole (3) with a diameter of 6.35 mm is pre-machined.

5. The positioning method for solving the problem of out-of-tolerance axis of composite material I-beam long stringer reinforced co-bonded wall panel as described in claim 4, characterized in that, The I-beam long girder (101) has pre-machined through holes with a diameter of 6.35 mm that correspond one-to-one with the positioning fixture (2).

6. The positioning method for solving the problem of out-of-tolerance axis of composite material I-beam long stringer reinforced co-bonded wall panel as described in claim 1, characterized in that, The non-porous isolation membrane (5) covering the I-shaped stringer (101) is made by punching holes, that is, punching holes in the I-shaped stringer (101) to expose it, and then covering the I-shaped stringer (101) with a non-porous isolation membrane (5).

7. The positioning method for solving the problem of out-of-tolerance axis of composite material I-beam long stringer reinforced co-bonded wall panel as described in claim 1, characterized in that, In the position verification of the I-beam long girder, the positioning fixture (2) needs to reserve a projection target hole when it is designed; after the wall plate (1) and the positioning fixture (2) are tangentially matched in the CATIA digital model, the projection is made using the projection software Virtek.

8. The positioning method for solving the problem of out-of-tolerance axis of composite material I-beam long stringer reinforced co-bonded wall panel as described in claim 1, characterized in that, The pressure pad (4) used in the placement and fitting of the pressure pad must be a soft pressure pad, which is made of rubber and prepreg.

9. The positioning method for solving the problem of out-of-tolerance axis of composite material I-beam long stringer reinforced co-bonded wall panel as described in claim 1, characterized in that, The connecting plate (1) formed by the I-beam long stringer (101) and the skin (102) is bonded to the positioning fixture (2) with a structural adhesive, wherein the structural adhesive is a high-temperature resistant structural adhesive.

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