CN108995252B - Method for verifying structural adhesive joint of composite material part - Google Patents
Method for verifying structural adhesive joint of composite material partDownload PDFInfo
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- CN108995252B CN108995252BCN201810673932.0ACN201810673932ACN108995252BCN 108995252 BCN108995252 BCN 108995252BCN 201810673932 ACN201810673932 ACN 201810673932ACN 108995252 BCN108995252 BCN 108995252B
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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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
Technical Field
The invention belongs to the technical field of composite material processing and forming, and particularly relates to a method for checking structural bonding of a composite material part.
Background
At present, an integrated structural design gradually becomes a mainstream design concept of a composite material structural design of a modern or future aircraft, the integrated design means that a plurality of parts are designed into an integrated part, the number of the parts, the mechanical assembly requirements of the parts and the assembly connecting piece are reduced, and further the structural design of the aircraft is reduced, and the integrated design degree of the parts of the composite material is higher and higher due to the characteristic that the material structure of the composite material is molded simultaneously.
At present, the composite material integrated forming technology mainly adopts the structure glue joint processes such as secondary glue joint, joint glue joint and the like to realize the structure integration, but the matching clearance check is needed to be carried out on the matching clearance between the structures when the glue joint is caused by the manufacturing tolerance and the surface flatness difference of the composite material structural member, and the structure glue joint film is adopted to compensate according to the check condition so as to ensure the glue joint quality. The existing calibration method is characterized in that auxiliary materials are mostly adopted for the existing calibration, such as a special calibration film, the special calibration film is taken down after the calibration is completed, a glue joint film is adopted to compensate corresponding regions of the calibration film according to the compression condition of the calibration film, and the special calibration film needs to be dismantled after being used, so that the existing calibration method is high in glue joint calibration compensation operation difficulty and high in calibration cost, and the problems that glue joint surface fit clearance is difficult to judge in situ and other auxiliary calibration materials are adopted to increase the cost when a composite material structure is glued are solved.
Disclosure of Invention
The invention aims to provide a method for verifying structural bonding of a composite material part, which aims to solve the problems of high operation difficulty and high verification cost in the existing composite material structural bonding verification, so that the verification operation is simpler and more convenient, and the manufacturing cost is reduced. According to the invention, the glue film for gluing is directly paved on the gluing area for checking, the glue film is not removed after the checking is finished, and the glue film compensation is directly carried out on the glue film according to the pressed state of the glue film, so that the situation that the compensation area is determined on a structural member by contrasting the checking film in the traditional checking method is avoided, the compensation area is more accurate, the checking operation difficulty is reduced, the glue film is directly used for gluing after the checking is finished, and the checking cost is effectively reduced.
The invention is mainly realized by the following technical scheme: a method for verifying structural bonding of composite material parts mainly comprises the following steps:
step S101: testing the adhesive film by a rheometer to obtain in-situ calibration parameters of the adhesive film; determining the checking pressure according to the pressure of the adhesive glue film during adhesive bonding;
step S102: flatly paving a glue-bonding adhesive film on a glue-bonding surface on the surface of the one-side glue-bonding structural member, wherein the glue-bonding adhesive film and the glue-bonding surface have the same shape; then laying an isolating film on the surface of the adhesive film, wherein the area of the isolating film is larger than that of the adhesive film;
step S103: positioning and assembling the structural part, packaging a vacuum bag, and checking according to the checking parameters of the temperature, the time and the pressure in the step S101; after the checking is finished, removing the vacuum bag, taking out the assembly, measuring the glue film and determining the compensation thickness of the glue film and the number of layers of the glue film according to the pressed state and area of the glue film; removing the isolation film on the surface of the adhesive film, and directly compensating by using the adhesive film.
The method for determining the compensation thickness of the adhesive film in step S103 is not an improvement point of the present invention and is not described in detail herein.
In order to better implement the present invention, in step S101, firstly, a rheometer is used to perform a temperature rise viscosity test on the adhesive film for adhesive bonding by using the rheometer, so as to obtain a softening initial temperature point of the adhesive film, and a verification temperature point T1 is given; secondly, performing constant-temperature viscosity test on the glue-bonding glue film for glue-bonding by using a rheometer so as to obtain available checkingtime t 1; the pressure P1 during the verification is determined according to the pressure selected during the gluing.
In order to better implement the present invention, in S103, a check is performed in an autoclave or an oven according to the temperature T1, the time T1, and the pressure P1.
In order to better implement the present invention, in step S102, a margin of 20-40 mm is left on the isolating film relative to the periphery of the adhesive film. The margin of the isolating film can ensure that the adhesive film is not stained on the structural member at the other side in the checking process.
In order to better implement the present invention, further, the glue film after the calibration in step S103 is not removed from the structural member, and is directly used for gluing the structural member after the compensation is completed.
The invention provides a checking method suitable for structural bonding of composite material parts, which adopts a glue film for bonding to carry out in-situ checking, aims to solve the problems that the fit clearance area between structures is difficult to accurately judge in the bonding process of the traditional composite material structure and the high cost caused by adopting a special auxiliary checking material, and is suitable for secondary bonding and co-bonding processes of structural parts.
The invention is realized by the following technical means: firstly, performing a viscosity-temperature-time relation test on an adhesive film for adhesive bonding of a composite material structure to obtain adhesive film in-situ verification process parameters, preparing a composite material structural member to be bonded to meet the adhesive bonding requirement, flatly paving the adhesive film for adhesive bonding on the surface of the composite material to be bonded, assembling the structural member in place after isolating the structural member by using an isolation film, completing verification work according to the obtained verification process parameters after packaging a vacuum bag, removing the vacuum bag after verification is completed, separating the composite material structural member, observing adhesive film indentations in the adhesive bonding area, judging a fit gap between structures, and performing adhesive film compensation on the structure.
The invention solves the technical problems that the fit clearance of the glue joint surfaces is difficult to judge in situ when the composite material structure is glued, and the cost is increased due to the adoption of other auxiliary checking materials, and the glue film in-situ checking is completed, so that the fit relation between the glue joint surfaces can be visually expressed, the glue film can be directly used for gluing the composite material, the checking accuracy can be effectively ensured, and the manufacturing cost and the subsequent compensation operation difficulty are reduced.
The technical scheme of the invention comprises the following steps:
firstly, testing the relation of viscosity-temperature-time of the adhesive film by adopting a rheometer to obtain the in-situ calibration process parameters of the adhesive film, such as temperature and time, and determining the pressure during calibration according to the pressure during adhesive bonding of the adhesive film. And secondly, flatly paving and pasting the glue film on the surface of the structural part to be glued on one side according to the gluing area according to the requirement, wherein the shape and the area of the glue film are consistent with those of the gluing surface, and paving and pasting the glue film to lay a layer of isolating film on the surface of the glue film, wherein the isolating film is larger than the area of the glue film and a margin of 20-40 mm is reserved on the periphery. And thirdly, positioning and assembling the structural part according to requirements, packaging a vacuum bag according to requirements, and verifying the structural part in an autoclave or an oven according to the temperature, time and pressure parameters determined in the first step. And fourthly, after the checking is finished, removing the vacuum bag, taking out the assembly, observing and measuring the state of the adhesive film, determining the compensation thickness of the adhesive film and the number of the used adhesive film layers according to the pressed state and the area of the adhesive film, removing the isolation film on the surface of the adhesive film, and directly compensating by adopting the adhesive film.
The checking adhesive film is an adhesive film used in structural adhesive bonding.
The structural adhesive joint is a secondary adhesive joint or a joint adhesive joint of the composite material.
Firstly, heating viscosity test is carried out on the adhesive film for bonding by adopting a rheometer to obtain a softening initial temperature point of the adhesive film, a checking temperature point is given, secondly, constant temperature viscosity test is carried out on the adhesive film for bonding by adopting the rheometer to obtain available checking time, and the pressure during checking is determined according to the pressure selected during bonding.
And in the second step, the glue film is paved and pasted according to the single side of the structural part gluing area.
The shape and area of the adhesive film are consistent with those of the adhesive surface.
The isolation film used in the second step needs to be larger than the area of the adhesive film, and a margin of 20-40 mm is reserved on the periphery of the isolation film, so that the adhesive film is not stained on a structural member on the other side in the checking process.
And in the fourth step, the checked adhesive film is not taken down from the structural part and is directly used for structural part gluing after compensation is finished.
The invention has the beneficial effects that:
(1) according to the invention, the glue film for gluing is directly paved on the gluing area for checking, the glue film is not removed after the checking is finished, and the glue film compensation is directly carried out on the glue film according to the pressed state of the glue film, so that the situation that the compensation area is determined on a structural member by contrasting the checking film in the traditional checking method is avoided, the compensation area is more accurate, the checking operation difficulty is reduced, the glue film is directly used for gluing after the checking is finished, and the checking cost is effectively reduced.
(2) In the step S102, the isolation film has a margin of 20-40 mm relative to the periphery of the adhesive film. The isolation film is provided with the allowance, so that the adhesive film is not stained on the structural member at the other side in the checking process, and the practicability is better.
Drawings
FIG. 1 is a schematic view illustrating the adhesive bonding of a structural member;
FIG. 2 is a schematic representation of a typical temperature-viscosity curve;
FIG. 3 is a schematic representation of a typical time-viscosity curve.
Wherein: 1-structural part, 2-glue adhesive film, 3-isolation film and 5-tool.
Detailed Description
Example 1:
a method for verifying structural bonding of a composite material part mainly comprises the following steps as shown in figure 1:
step S101: testing theadhesive film 2 by a rheometer to obtain in-situ calibration parameters of theadhesive film 2; and determining the checking pressure according to the pressure of theadhesive glue film 2 during adhesive bonding;
step S102: flatly paving the glue-bondingadhesive film 2 on the glue-bonding surface on the surface of the one-side glue-bondingstructural component 1, wherein the glue-bondingadhesive film 2 and the glue-bonding surface have the same shape; then, laying a layer of isolating film 3 on the surface of theadhesive bonding film 2, wherein the area of the isolating film 3 is larger than that of theadhesive bonding film 2;
step S103: positioning and assembling thestructural part 1, packaging a vacuum bag, and checking according to the checking parameters of the temperature, the time and the pressure in the step S101; after the verification is finished, removing the vacuum bag, taking out the assembly, measuring theglue film 2, and determining the compensation thickness of theglue film 2 and the number of layers of theglue film 2 according to the pressed state and area of theglue film 2; the isolating film 3 on the surface of the glue-bondingglue film 2 is removed, and the glue-bondingglue film 2 is directly adopted for compensation.
As shown in fig. 1, astructural member 1 is placed on atooling 5, aglue film 2 is arranged on the surface of thestructural member 1 above the structural member, and an isolation film 3 is arranged between thestructural members 1.
According to the invention, the glue film for gluing is directly paved on the gluing area for checking, the glue film is not removed after the checking is finished, and the glue film compensation is directly carried out on the glue film according to the pressed state of the glue film, so that the situation that the compensation area is determined on thestructural member 1 by contrasting the checking film in the traditional checking method is avoided, the compensation area is more accurate, the checking operation difficulty is reduced, the glue film is directly used for gluing after the checking is finished, and the checking cost is effectively reduced.
Example 2:
in this embodiment, optimization is performed on the basis ofembodiment 1, as shown in fig. 2 and fig. 3, in step S101, firstly, a rheometer is used to perform a temperature rise viscosity test on theadhesive film 2 for adhesive bonding, so as to obtain a softening initial temperature point of theadhesive film 2, and a verification temperature point T1 is given; secondly, performing constant-temperature viscosity test on the glue-bonding glue film 2 for glue-bonding by using a rheometer so as to obtain available checkingtime t 1; the pressure P1 during the verification is determined according to the pressure selected during the gluing. In S103, the test is performed in an autoclave or an oven according to the temperature T1, the time T1, and the pressure P1. The gluedmembrane 2 after the verification in step S103 is not taken down from thestructural member 1, and is directly used for gluing thestructural member 1 after the compensation is completed.
According to the invention, the glue film for gluing is directly paved on the gluing area for checking, the glue film is not removed after the checking is finished, and the glue film compensation is directly carried out on the glue film according to the pressed state of the glue film, so that the situation that the compensation area is determined on thestructural member 1 by contrasting the checking film in the traditional checking method is avoided, the compensation area is more accurate, the checking operation difficulty is reduced, the glue film is directly used for gluing after the checking is finished, and the checking cost is effectively reduced.
Other parts of this embodiment are the same asembodiment 1, and thus are not described again.
Example 3:
the embodiment is optimized on the basis ofembodiment adhesive film 2. The isolation film 3 is provided with a margin to ensure that the adhesive film is not stained on thestructural member 1 at the other side in the checking process, and has better practicability.
According to the invention, the glue film for gluing is directly paved on the gluing area for checking, the glue film is not removed after the checking is finished, and the glue film compensation is directly carried out on the glue film according to the pressed state of the glue film, so that the situation that the compensation area is determined on thestructural member 1 by contrasting the checking film in the traditional checking method is avoided, the compensation area is more accurate, the checking operation difficulty is reduced, the glue film is directly used for gluing after the checking is finished, and the checking cost is effectively reduced.
The rest of this embodiment is the same asembodiment
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (5)
1. A method for verifying structural bonding of composite material parts is characterized by mainly comprising the following steps:
step S101: testing the adhesive film (2) by adopting a rheometer to obtain an in-situ verification parameter of the adhesive film (2); and determining the checking pressure according to the pressure of the adhesive film (2) during adhesive bonding;
step S102: flatly paving the glue-bonding glue film (2) on the glue-bonding surface on the surface of the single-side glue-bonding structural member (1), wherein the glue-bonding glue film (2) has the same shape as the glue-bonding surface; then laying a layer of isolating film (3) on the surface of the adhesive bonding adhesive film (2), wherein the area of the isolating film (3) is larger than that of the adhesive bonding adhesive film (2);
step S103: positioning and assembling the structural part (1), packaging a vacuum bag, and checking according to the checking parameters of the temperature, the time and the pressure in the step S101; after the checking is finished, removing the vacuum bag, taking out the assembly, measuring the glue film (2), and determining the compensation thickness of the glue film (2) and the number of layers of the glue film (2) according to the pressed state and area of the glue film (2); the isolating film (3) on the surface of the adhesive glue film (2) is removed, and the adhesive glue film (2) is directly adopted for compensation.
2. The method for verifying the structural gluing of the composite material part as claimed in claim 1, wherein in the step S101, firstly, a rheometer is adopted to perform a temperature rise viscosity test on the gluing film (2) for gluing, the rheometer is adopted to obtain a softening initial temperature point of the gluing film (2), and a verification temperature point T1 is given; secondly, performing constant-temperature viscosity test on the glue-bonding glue film (2) for glue-bonding by using a rheometer so as to obtain available checking time t 1; the pressure P1 during the verification is determined according to the pressure selected during the gluing.
3. The method for verifying structural bonding of composite material parts according to claim 2, wherein in step S103, verification is performed in an autoclave or an oven according to temperature T1, time T1 and pressure P1.
4. The method for verifying the structural bonding of the composite material part according to claim 3, wherein the bonding adhesive film (2) after the verification in step S103 is not removed from the structural member (1) and is directly used for bonding the structural member (1) after the compensation is completed.
5. The method for verifying the structural bonding of the composite material part according to claim 1 or 2, wherein in the step S102, the isolating film (3) has a margin of 20-40 mm with respect to the periphery of the bonding adhesive film (2).
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| CN201810673932.0ACN108995252B (en) | 2018-06-27 | 2018-06-27 | Method for verifying structural adhesive joint of composite material part |
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| CN201810673932.0ACN108995252B (en) | 2018-06-27 | 2018-06-27 | Method for verifying structural adhesive joint of composite material part |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110154495A (en)* | 2019-05-21 | 2019-08-23 | 安徽佳力奇碳纤维科技股份公司 | A kind of honeycomb core sag compensation method |
| CN112810192B (en)* | 2020-12-24 | 2022-08-09 | 中国航空制造技术研究院 | Method for verifying matching quality before gluing original skeleton and new skin and verification tool thereof |
| CN112793193B (en)* | 2020-12-24 | 2022-08-09 | 中国航空制造技术研究院 | Method for verifying molding quality of adhesive joint surface of double-curved-surface variable-thickness aluminum honeycomb and verification tool thereof |
| CN116202848A (en)* | 2021-12-01 | 2023-06-02 | 上海飞机制造有限公司 | A kind of preparation method of composite material test piece |
| CN115207601B (en)* | 2022-07-20 | 2024-10-25 | 中国航空工业集团公司济南特种结构研究所 | Conformal antenna structure gluing compensation method |
| CN115258191A (en)* | 2022-09-26 | 2022-11-01 | 成都飞机工业（集团）有限责任公司 | Assembly clearance compensation method |
| CN115655065A (en)* | 2022-09-30 | 2023-01-31 | 成都飞机工业（集团）有限责任公司 | Method for checking fit clearance in large-area glued joint |
| CN116872532A (en)* | 2023-06-26 | 2023-10-13 | 安徽佳力奇先进复合材料科技股份公司 | An integrated molding process for composite structural parts |
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| DE19632589A1 (en)* | 1996-08-13 | 1998-02-19 | Haake Gmbh Geb | Normal reaction measurement for rheometer |
| US20060287480A1 (en)* | 2005-06-17 | 2006-12-21 | Crawford Emmett D | Outdoor shelters comprising polyester compositions formed from 2,2,4,4-tetramethyl-1,3-cyclobutanediol and 1,4-cyclohexanedimethanol |
| CN106827557B (en)* | 2017-01-17 | 2018-11-02 | 成都飞机工业（集团）有限责任公司 | Composite material is glued reinforced structure and is glued face compensation method altogether |
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