CN115416392B - Method for controlling cementing deformation of composite sandwich structure - Google Patents
Method for controlling cementing deformation of composite sandwich structure Download PDFInfo
- Publication number
- CN115416392B CN115416392B CN202211158480.5A CN202211158480A CN115416392B CN 115416392 B CN115416392 B CN 115416392B CN 202211158480 A CN202211158480 A CN 202211158480A CN 115416392 B CN115416392 B CN 115416392B
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- Prior art keywords
- sandwich structure
- deformation
- composite
- cementing
- rear edge
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- 239000002131 composite material Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000011162 core material Substances 0.000 claims abstract description 27
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 14
- 239000002390 adhesive tape Substances 0.000 claims abstract description 9
- 239000003365 glass fiber Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000005764 inhibitory process Effects 0.000 abstract description 4
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 6
- 239000006260 foam Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/18—Handling of layers or the laminate
- B32B38/1825—Handling of layers or the laminate characterised by the control or constructional features of devices for tensioning, stretching or registration
- B32B38/1833—Positioning, e.g. registration or centering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B41/00—Arrangements for controlling or monitoring lamination processes; Safety arrangements
Landscapes
- Laminated Bodies (AREA)
Abstract
The invention relates to a method for controlling the cementing deformation of a composite sandwich structure, which comprises the following steps: the support core mold and the positioning stop block are arranged on one side of the composite material sandwich structure beam, one side of the end rib and one side of the side rib, the slidable stop block is arranged on one side of the rear edge strip of the composite material sandwich structure and is adhered to the gluing tool through the double-sided adhesive tape, the slidable stop block can limit and control the deformation of one side of the rear edge strip of the composite material sandwich structure in the gluing process, and when the deformation stress exceeds the limit, the displacement of the slidable stop block can occur to allow the deformation of the rear edge strip so as to reduce the deformation stress when the deformation stress possibly leads to the debonding of the skin and the core material. The method for controlling the cementing deformation of the composite sandwich structure can effectively inhibit the cementing deformation of the composite sandwich structure, is simple to operate and obvious in effect, can not cause internal cementing defects caused by excessive inhibition of the appearance, and has good internal quality and high dimensional accuracy of the finally cemented part.
Description
Technical Field
The invention belongs to the technical field of composite material manufacturing, and relates to a method for controlling the cementing deformation of a composite material sandwich structure, which is mainly used for controlling the deformation of a composite material honeycomb or foam sandwich structure in a secondary cementing process.
Background
The composite material has the advantages of high specific strength, high specific rigidity, strong designability, good fatigue fracture resistance, corrosion resistance, good dimensional stability, convenience for large-area integral forming and the like, and becomes one of the most main aviation structural materials in the current generation. The composite sandwich structure is a structural material with very large strength-to-weight ratio, and compared with a solid material, the composite sandwich structure uses only 1% -5% of the effective material of the replaced material, and is obviously a light material with great potential, saving materials and low energy consumption. The composite sandwich structure for aviation is generally a foam sandwich structure or a honeycomb sandwich structure, is commonly used for secondary bearing components such as an aircraft elevator, a flap aileron and the like, and the successful process is mainly secondary cementing molding. In the secondary bonding process, the composite material and the core material, the adhesive film, the foaming adhesive and other thermal expansion coefficients are inconsistent, so that the final formed composite material sandwich structure has bonding deformation. The prior secondary gluing process generally adopts a supporting core mold and a positioning stop block to inhibit the gluing deformation of the sandwich structure. If the support core mold and the positioning stop block have insufficient deformation inhibition on the sandwich structure, the assembly and the pneumatic appearance of the final product are greatly affected by the cementing deformation; if the deformation of the sandwich structure is restrained too much by the support core die and the positioning stop block, the internal gluing defects such as debonding and the like are easily caused by part warping in the gluing process.
Disclosure of Invention
(1) Technical problem to be solved
The embodiment of the invention provides a method for controlling the cementing deformation of a composite material sandwich structure, which comprises the steps of placing a supporting core mould and a positioning stop block on one side of a composite material sandwich structure beam, one side of an end rib and one side of a side rib, placing a slidable stop block on one side of a rear edge of the composite material sandwich structure, and adhering the slidable stop block to a cementing tool through a double-sided adhesive tape.
The method for controlling the cementing deformation of the composite sandwich structure, provided by the invention, can effectively inhibit the cementing deformation of the composite sandwich structure, is simple to operate and obvious in effect, can not cause internal cementing defects caused by excessive inhibition of deformation, and has good internal quality and high dimensional accuracy of the finally cemented part.
(2) Technical proposal
The embodiment of the invention provides a method for controlling the cementing deformation of a composite material sandwich structure, wherein a supporting core mold and a positioning stop block are arranged on one side of a composite material sandwich structure beam, one side of an end rib and one side of a side rib, a slidable stop block is arranged on one side of a rear edge strip of the composite material sandwich structure, and the slidable stop block is adhered to a cementing tool through a double-sided adhesive tape.
Further, the slidable limiting block is made of a glass fiber composite material, the number of the slidable limiting blocks is n, n= (L-2)/0.8, n is an integer, wherein L is the length of the composite material foam sandwich structure, and the unit is meter.
Further, a 5mm-10mm allowance is reserved on one side of the upper skin, the lower skin and the back edge strip of the composite material sandwich structure, the same allowance is reserved on the back edge strip and the skin, and the allowance is removed after the composite material foam sandwich structure is formed in a gluing mode.
Furthermore, the double-sided adhesive tape is a temperature-resistant adhesive tape, no failure occurs at the upper limit of the bonding temperature, and the bonding shear strength is between 0.1MPa and 2 MPa.
Furthermore, the sliding limiting block can limit and control the deformation of one side of the rear edge strip of the composite material sandwich structure in the gluing process, and when the deformation stress exceeds the limit, the sliding limiting block can displace to allow the rear edge strip to deform so as to reduce the deformation stress when the skin and the core material are possibly debonded.
(3) Advantageous effects
The method for controlling the cementing deformation of the composite sandwich structure can effectively inhibit the cementing deformation of the composite sandwich structure, is simple to operate and obvious in effect, can not cause internal cementing defects caused by excessive inhibition of the appearance, and has good internal quality and high dimensional accuracy of the finally cemented part.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed 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 other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
FIG. 1 is a schematic illustration of the adhesive bonding positioning of a composite sandwich structure of the present invention.
FIG. 2 is a schematic diagram of a composite sandwich structure skeleton of the present invention.
Fig. 3 is a cross-sectional view of a composite sandwich vertical beam axis according to the invention.
In the figure:
1-a composite material sandwich structure gluing tool main body; 2-end rib support core mold; 3-side rib supporting core mold; 4-beam support mandrel; 5-end rib positioning stop blocks; 6-a side rib positioning stop block; 7-a beam positioning stop block; 8-a slidable stopper; 9-a composite sandwich structure; 10-end ribs; 11-side ribs; 12-beams; 13-a rear edge strip; 14-core material; 15-upper skin; 16-lower skin.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying 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, substitutions and improvements in parts, components and connections without departing from the spirit of the invention.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1, the composite sandwich structure 9 is composed of an upper skin 15, a lower skin 16, end ribs 10, side ribs 11, beams 12, back side strips 13 and a core 14. In the gluing process, the end rib supporting core mould 2, the side rib supporting core mould 3 and the beam supporting core mould 4 are respectively arranged on the inner molded surfaces of the end rib 10, the side rib 11 and the beam 12 of the composite sandwich structure and are used for supporting the inner molded surfaces of the parts. The end rib positioning stop block 5, the side rib positioning stop block 6 and the beam positioning stop block 7 are respectively clung to the end rib support core mould 2, the side rib support core mould 3 and the beam support core mould 4 and are used for positioning the end rib 10, the side rib 11 and the beam 12 in the gluing process. The slidable limiting block 8 is adhered and mounted on the outer side of the rear edge strip 13 of the composite material sandwich structure through a double-sided adhesive tape and is used for positioning the rear edge strip of the composite material sandwich structure 9.
The innovation point of the scheme of the invention is that in the gluing process, the sliding limiting block 8 not only can limit and control the deformation of one side of the rear edge 13 of the composite sandwich structure 9, but also can slide to a certain extent along the original limiting direction so as to ensure the internal quality of gluing. In the gluing process of the composite sandwich structure 9, when the deformation stress of the parts caused by different thermal expansion coefficients exceeds a limit, if the slidable limiting block 8 is not movable like the end rib positioning block 5, the side rib positioning block 6 and the beam positioning block 7, deformation and warping of the upper skin 15, the lower skin 16 or the beam 12 may occur, so that the upper skin 15, the lower skin 16 or the beam 12 and the core 14 have debonding defects. Therefore, when the deformation stress of the part caused by different thermal expansion coefficients exceeds a limit, the slidable limiting block 8 can slide to a certain extent along the original limiting direction, when the slidable limiting block 8 slides, when the deformation stress of the part caused by different thermal expansion coefficients is reduced due to the deformation of the part, and when the bonding strength of the slidable limiting block 8 and the deformation stress of the part reach balance, the slidable limiting block 8 does not slide any more. And when the sliding limiting block 8 does not slide any more, the cementing deformation of the composite sandwich structure 9 is restrained.
Optionally, in this embodiment, the double-sided tape is a heat-resistant tape, no failure occurs at the upper limit of the bonding temperature, and the bonding shear strength is between 0.1MPa and 2 MPa.
Optionally, in this embodiment, the slidable stopper 8 is a glass fiber composite material, the number is n, n= (L-2)/0.8, n is an integer, where L is the length of the composite sandwich structure in meters.
Specifically, the number of the required slidable limiting blocks 8 can be calculated according to the above formula so as to adapt to the composite sandwich structure with different lengths.
Optionally, in this embodiment, a margin of 5mm-10mm is reserved on the glued side of the upper skin 15 and the lower skin 16 of the composite sandwich structure and the back edge 13, the same margin is reserved on the back edge 13, and the margin is removed after the composite sandwich structure is glued and formed.
Specifically, after the composite sandwich structure 9 is glued and formed, the sliding stopper 8 may slip due to excessive deformation stress, so that the rear edge 13 of the composite sandwich structure may deform to some extent. Because the slidable limiting block 8 has one piece every 0.8m, for longer composite material sandwich structure 9 exceeding 4m, the rear edge 13 of the composite material sandwich structure after the bonding is possibly S-shaped, and the allowance of 5mm-10mm in the width direction of the rear edge is removed at the moment, so that the appearance precision of the formed composite material sandwich structure 9 is ensured.
It should be understood that, in the present specification, each embodiment is described in an incremental manner, and the same or similar parts between the embodiments are all referred to each other, and each embodiment is mainly described in a different point from other embodiments. The invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known method techniques is omitted here 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 of this application will become apparent to those skilled in the art without departing from the scope of this application. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.
Claims (3)
1. The method for controlling the cementing deformation of the composite sandwich structure is characterized in that in the cementing process, an end rib supporting core mold (2), an edge rib supporting core mold (3) and a beam supporting core mold (4) are respectively arranged on inner molded surfaces of the end rib (10), the edge rib (11) and the beam (12) of the composite sandwich structure and are used for supporting the inner molded surfaces of a part; the end rib positioning stop block (5), the side rib positioning stop block (6) and the beam positioning stop block (7) are respectively clung to the end rib supporting core mould (2), the side rib supporting core mould (3) and the beam supporting core mould (4) and are used for positioning the end rib (10), the side rib (11) and the beam (12) in the gluing process; the sliding limiting block (8) is stuck and installed on the outer side of the rear edge strip (13) of the composite material sandwich structure through a double-sided adhesive tape and is used for positioning the rear edge strip of the composite material sandwich structure (9);
Reserving a margin of 5mm-10mm on one side of the upper skin (15) and the lower skin (16) which are bonded with the rear edge strip (13) of the composite material sandwich structure, reserving the same margin on the rear edge strip (13), and removing the margin after the composite material sandwich structure is bonded and molded;
the sliding limiting block (8) can limit and control the deformation of one side of the rear edge strip (13) of the composite sandwich structure in the gluing process, and when the deformation stress exceeds the limit, the sliding limiting block (8) can displace to allow the rear edge strip (13) to deform so as to reduce the deformation stress when the upper skin (15) or the lower skin (16) is possibly debonded from the core material (14).
2. The method for controlling the cementing deformation of a composite sandwich structure according to claim 1, wherein the slidable limiting blocks (8) are made of glass fiber composite materials, the number of the slidable limiting blocks is n, n= (L-2)/0.8, n is an integer, and L is the length of the composite sandwich structure, and the unit is m.
3. The method for controlling the bonding deformation of a sandwich structure of a composite material according to claim 1, wherein the double-sided adhesive tape is a heat-resistant adhesive tape, no failure occurs at the upper limit of bonding temperature, and the bonding shear strength is between 0.1 and 2 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211158480.5A CN115416392B (en) | 2022-09-22 | 2022-09-22 | Method for controlling cementing deformation of composite sandwich structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211158480.5A CN115416392B (en) | 2022-09-22 | 2022-09-22 | Method for controlling cementing deformation of composite sandwich structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115416392A CN115416392A (en) | 2022-12-02 |
| CN115416392B true CN115416392B (en) | 2024-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211158480.5A Active CN115416392B (en) | 2022-09-22 | 2022-09-22 | Method for controlling cementing deformation of composite sandwich structure |
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