CN115958798A - Method for improving adhesive surface quality of metal section and composite material - Google Patents
Method for improving adhesive surface quality of metal section and composite material Download PDFInfo
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- CN115958798A CN115958798A CN202211196159.6A CN202211196159A CN115958798A CN 115958798 A CN115958798 A CN 115958798A CN 202211196159 A CN202211196159 A CN 202211196159A CN 115958798 A CN115958798 A CN 115958798A
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- metal section
- composite material
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- bonding
- quality
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- 239000002184 metal Substances 0.000 title claims abstract description 83
- 239000002131 composite material Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000853 adhesive Substances 0.000 title claims description 12
- 230000001070 adhesive effect Effects 0.000 title claims description 12
- 230000001154 acute effect Effects 0.000 claims abstract description 3
- 239000004744 fabric Substances 0.000 claims description 19
- 239000002313 adhesive film Substances 0.000 claims description 12
- 238000004026 adhesive bonding Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- 239000003292 glue Substances 0.000 claims description 7
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 2
- 230000001976 improved effect Effects 0.000 abstract description 5
- 238000009827 uniform distribution Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 229920001971 elastomer Polymers 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000004806 packaging method and process Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000012945 sealing adhesive Substances 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000005340 laminated glass Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 phenolic aldehyde Chemical class 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
Abstract
The invention belongs to the technical field of aviation structure bonding, and discloses a method for improving the bonding surface quality of a metal section and a composite material, wherein before the vacuumizing step of bonding the metal section and the composite material, an auxiliary tool which is hard, flat in bottom surface and acute in inclined plane to the bottom surface is placed at the edge of the metal section, the vertical surface of the auxiliary tool is tightly attached to the edge of the metal section, the bottom surface of the auxiliary tool is tightly attached to the composite material, and then the vacuumizing step is carried out; and taking out the auxiliary tool after the vacuumizing is finished. According to the invention, the hard auxiliary tool with the oblique angle of 15-30 degrees is additionally arranged on the side wall of the metal section at the buckling deformation part, so that the uniform distribution and the effective transmission of the pressure of the whole pressure-bearing surface are ensured, the buckling deformation of the glued joint edge of the special metal section and the composite material skin is solved, the glued joint surface quality of the special metal section and the composite material skin is improved, and the requirements of the product on strength, skin integrity and connection assembly precision are ensured.
Description
Technical Field
The invention belongs to the technical field of aviation structure bonding, relates to a bonding method, and particularly relates to a method for improving the bonding surface quality of a metal section and a composite material.
Background
In order to meet the requirements of the composite material wall plate part of a special airplane on strength, skin integrity, connection assembly precision and the like, a product design selects a composite material skin and special metal section bar glue joint structure. At present, the manufacture of products of the type generally adopts a secondary gluing method or a gluing and riveting method, wherein a composite material assembly is heated and cured into a rigid assembly through an autoclave, then the rigid assembly is glued and positioned with a metal section through a medium-temperature or high-temperature structural adhesive film and then is heated and pressurized and cured in the autoclave, and the gluing strength is influenced because a gluing surface is easy to generate a fit gap or an incongruous defect, so that the gluing strength of the product is met, the integrity of a composite material skin, the assembly precision and other aspects, the product manufacture selects a method of a metal section and a composite material skin co-gluing prepreg, namely the prepreg and the metal section are glued and positioned together in the autoclave for heating and pressurizing and curing, after a first product is trial-manufactured, the phenomenon that the composite material skin layer at the edge of a special metal section has bending deformation (shown in an attached figure 1) is detected, and the surface quality does not meet the product manufacture requirements.
In order to improve the quality of the bonding surface of the product and solve the problem of buckling deformation in the bonding process of a special metal section and a composite material skin, through multiple times of improvement test verification, an auxiliary tool is tried to be arranged at the position where the buckling deformation occurs, at first, common materials and structures such as a silicon rubber plate and a rubber sealing strip are tried, and although the problem that the buckling deformation of the part is serious due to the fact that pressure cannot be applied to the side wall of the metal section completely because the vacuum bag is bridged in the heating and pressurizing curing process of a packaging vacuum bag in an autoclave is solved, the rubber material can soften and flow in the heating process, so that the shape is irregular, the pressure cannot be guaranteed to be completely and effectively transferred, the difference exists between the side wall of the metal section and the surrounding pressure, and the internal quality and the surface flatness of the part are affected; in addition, the rubber material is heated and softened, then flows freely, the shape, the edge thickness, the inclination angle and the like are difficult to control, secondary buckling deformation occurs on the edge of the rubber strip after heating, pressurizing and curing, and the buckling deformation of the original metal side wall is transferred to the edge of the rubber strip, so that the problem of buckling deformation cannot be effectively and thoroughly solved. In addition, through tests, the influence of an included angle between the upper surface of the auxiliary tool and the composite material skin on the effect of solving the buckling deformation is large, the larger the included angle is, the worse the effect is, the auxiliary tool with the included angle of 60 degrees is adopted in the test attempt, the buckling deformation basically does not change, when the auxiliary tool with the included angle of 45 degrees is adopted in the test attempt, the buckling deformation has certain change, the included angle is gradually reduced, the improvement effect is more and more obvious, and the comprehensive test result theoretical analysis shows that the smaller the included angle is, the better the included angle is, but the smaller the included angle is, the larger the auxiliary tool is, and new problems (part size limitation, tool cost and the like) can be brought.
Disclosure of Invention
In order to solve the problems, the invention provides a method for improving the quality of the bonding surface of a metal section and a composite material, which can solve the problem of buckling deformation in the bonding process of a special metal section and a composite material skin.
The technical scheme of the invention is as follows:
before the vacuumizing step of the bonding of the metal section and the composite material, an auxiliary tool which is hard, flat in bottom surface and acute in inclined plane and bottom surface is placed at the edge of the metal section, the vertical surface of the auxiliary tool is tightly attached to the edge of the metal section, the bottom surface of the auxiliary tool is tightly attached to the composite material, and then the vacuumizing step is carried out; and taking out the auxiliary tool after the vacuumizing is finished.
Furthermore, the number of the auxiliary tools is the same as the number of the types of the vertical surfaces of the metal section bars, and the height of the auxiliary tools is consistent with the height of the vertical surfaces of the metal section bars.
Furthermore, the included angle between the inclined plane of the auxiliary tool and the bottom surface is 15-30 degrees.
Furthermore, the auxiliary tool is made of a high-temperature-resistant hard material.
Furthermore, the auxiliary tool is made of one or combination of high-temperature-resistant metal, high-temperature-resistant hard plastic and a laminated cloth plate.
Furthermore, after the auxiliary tool is placed, the position of the auxiliary tool and the position of the metal section are fixed by using a pressure sensitive adhesive tape.
Further, the method specifically comprises the following steps:
step one, preparing an auxiliary tool according to the height and length of the side wall of the special metal section;
step two, sticking the adhesive surface of the special metal section by using an adhesive film, wherein the periphery of the adhesive film is slightly larger than the adhesive surface of the metal section;
thirdly, laying and cutting stripping cloth on the composite material skin according to the shape of the adhesive surface of the special metal section, and then attaching the special metal section to a stripping cloth notch on the composite material skin;
placing the auxiliary tool close to the special metal section and fixing the auxiliary tool with the special metal section;
and step five, vacuumizing and curing, and taking out the auxiliary tool after curing.
Furthermore, after the auxiliary tool is taken out, the surface quality of the glued component is checked, and the redundant glue on the surface is polished and removed.
Has the advantages that:
1. according to the process method provided by the invention, a hard auxiliary tool with an oblique angle of 15-30 degrees is added on the side wall of the metal section at the buckling deformation part, the hard auxiliary tool is placed close to the metal section and fixed by a pressure sensitive adhesive tape, then an encapsulation vacuum bag is fed into an autoclave for heating, pressurizing and curing, and the problem of bridging of the section at the part and the composite material skin vacuum bag is effectively solved due to the gradient of the auxiliary tool, so that the uniform distribution and the effective transmission of the pressure of the whole pressure-bearing surface are ensured, the buckling deformation of the bonding edge of the special metal section and the composite material skin is solved, the bonding surface quality of the special metal section and the composite material skin is improved, and the requirements of the strength, the skin integrity and the connection assembly precision of the product are ensured.
2. The hard material is selected as a key, the tool made of the hard material can effectively ensure the appearance, particularly the bevel angle, of the auxiliary tool, can effectively transmit vacuum bags, can pressure and the like to the composite material skin through the hard auxiliary tool, and the pressure of the composite material skin is consistent with the surface pressure of a metal material, so that the influence on the internal quality of the composite material or the generation of secondary buckling deformation and the like caused by pressure difference and the like is avoided.
3. Experiments verify that the larger the included angle between the upper surface of the auxiliary tool and the composite material skin is, the poorer the effect of overcoming the defect of buckling deformation is, the better the effect is, the influence of the size of a part, the manufacturing quality requirement, the cost of the auxiliary tool and the like is comprehensively considered, the 15-30 included angle can meet the requirement of the product manufacturing surface quality, the cost can be controlled, and the requirements of the size of the part and the requirement of a processing platform can be met.
Drawings
FIG. 1 is a diagram of deformation defects before improvement;
FIG. 2 is a diagram of the improved effect;
FIG. 3 is a view of an auxiliary tool;
FIG. 4 is a view of auxiliary tool placement and positioning;
FIG. 5 is a vacuum bag encapsulation diagram.
Wherein: 1-1 special metal section bar, 1-2 composite material skin, 1-3 buckling deformation defects, 2-1 auxiliary tool, 2-2 improved rear surface state, 3-1 left side auxiliary tool, 3-2 left side auxiliary tool oblique angle, 3-3 right side auxiliary tool, 3-4 right side auxiliary tool oblique angle, 4-1 forming die, 4-2 special metal section bar, 4-3 composite material skin layer, 4-4 glass cloth, 4-5 left side auxiliary tool positioning, 4-6 right side auxiliary tool positioning, 5-1 isolating film, 5-2 breathable felt, 5-3 sealing adhesive tape and 5-4 vacuum bag film.
Detailed Description
The present section is an embodiment of the present invention for explaining and explaining the technical solution of the present invention. The embodiments of the invention and the features of the embodiments can be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate directions or positional relationships to give the drawings the orientation or positional relationships, and are used for convenience of description and simplicity of description, but do not indicate or imply that the device or case being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include more than one of the feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected" and "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection or an integrated connection; the connection can be mechanical connection or point connection; the connection may be direct or indirect through an intermediate medium, and the connection may be internal to the two elements. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention is explained in detail below with reference to the figures and with reference to embodiments.
In order to improve the cementing surface quality of the product and solve the problem of buckling deformation in the cementing process of the special metal section and the composite material skin. Through multiple improvement tests and verifications, an auxiliary tool with the gradient of 15-30 degrees is added on the side wall of the metal section at the part where the buckling deformation occurs, high-temperature-resistant hard plastic, a laminated cloth plate, hard metal and the like are placed to be tightly attached to the metal section and fixed by a pressure-sensitive adhesive tape, and then an encapsulated vacuum bag is filled into an autoclave to be heated, pressurized and cured, because the gradient of the auxiliary tool effectively solves the problem of bridging of the section and a composite material skin vacuum bag at the part, the uniform distribution of the pressure of the whole stressed surface is ensured, the buckling deformation caused by the pressure difference between the composite material skin and the metal section at the part is avoided, the surface quality of the special metal section and the composite material skin is improved, the requirements of the strength, the skin integrity and the connection and assembly precision of the product are ensured, and the attached drawing 2 shows.
The method mainly comprises the steps of auxiliary tool preparation, special metal section adhesive surface preparation, forming tool preparation, composite material skin prepreg paving, special metal section positioning and adhesive bonding, glass cloth paving, auxiliary tool positioning, vacuum bag packaging, adhesive bonding component inspection, surface finishing and the like, and the specific steps and requirements are as follows:
1) Preparing an auxiliary tool: according to the height, length and other dimensions of the side wall of the special metal section, an epoxy phenolic aldehyde laminated glass cloth plate is processed into the shape of figure 3 through numerical control, wherein the oblique angles of the auxiliary tool are controlled according to the requirement of 15-30 degrees, and the surface is smooth and streamline;
2) Preparing a special metal section gluing surface: firstly, cleaning and degreasing the glued joint surface of the special metal section bar by using 180# aviation washing gasoline, airing for 30min, then polishing the glued joint surface of the special metal section bar by using 120# abrasive paper, wiping by using fine white cotton cloth, then cleaning by using alcohol, and airing for 15min for later use;
3) Preparing a forming tool: cleaning glue and sundries accumulated on the surface of a forming tool, wiping the glue and sundries clean by adopting white muslin cloth, cleaning the forming surface of a mould by dipping the white muslin cloth in alcohol, airing for 15min, and then coating Frekote55NC mould release agents twice at intervals of 10min each time;
4) Paving and pasting composite material skin prepreg, paving and pasting prepreg on the surface of a prepared forming mold according to the paving material, angle composition, quantity and the like required by a composite material skin pattern, packaging a vacuum bag after paving and pasting, vacuumizing and pre-compacting (a porous isolating film and a breathable material are sequentially paved on the prepreg), wherein the vacuum pressure is not less than-0.08 MPa, and the time is 2 h-4 h;
5) Positioning and gluing special metal sectional materials: cutting a J-271 structural adhesive film according to the adhesive surface size of the metal section, wherein the periphery of the adhesive film is 0.5-1 mm larger than the adhesive surface of the metal section, tearing off release paper on one side of a cut adhesive film sheet to paste the cut adhesive film sheet on the adhesive surface of the metal section, paving and flattening the adhesive film during pasting, and not allowing the phenomena of wrinkling, adhesive film pulling deformation and the like, then accurately positioning the special metal section and a composite material skin according to a laser projection positioning edge line, and then packaging a vacuum bag for vacuumizing and pre-compacting (a porous isolating film and a breathable material are sequentially laid on prepreg), wherein the vacuum pressure is not less than-0.08 MPa, and the time is 2-4 h;
6) Paving and sticking stripping cloth: laying and sticking a layer of Release Ply B stripping cloth on the composite material skin, cutting and removing the stripping cloth along the bonding edge of the metal section and the skin, laying and sticking the whole stripping cloth and the cutting edge smoothly and solidly, and then simply fixing the stripping cloth by using an adhesive tape;
7) Auxiliary tool positioning: positioning an auxiliary tool tightly attached to the metal section, wherein the positioning process needs to be carried out so as to avoid deformation and wrinkles of the stripping cloth, and then connecting and fixing the two components by adopting GS-213 pressure-sensitive adhesive tapes and the upper surface of the metal section through the auxiliary tool so as to prevent slippage in the heating and curing process, as shown in figure 4;
8) Packaging a vacuum bag: sequentially laying a layer of A4000 imperforate isolating membrane, AIRWEAVE N10 ventilated felt, WN1500 vacuum bag (the periphery is glued by sealing adhesive tape) and the like on the assembly which is laid, glued and positioned, then vacuumizing, simultaneously adjusting the bridged vacuum bag, particularly the slope part of an auxiliary tool to ensure the vacuum bag is tightly stuck, and then sending the vacuum bag into an autoclave to carry out heating and pressurizing curing according to curing parameters of composite material skin and adhesive film, wherein the attached drawing 5 shows that the vacuum bag is solid;
9) Inspecting glued components and finishing surfaces: and after the curing is finished, removing the vacuum bag, checking the surface quality of the glue joint assembly, polishing and removing the redundant glue accumulation on the surface and the like.
Claims (8)
1. A method for improving the quality of the surface of a metal section and a composite material in a bonding mode is characterized in that before the vacuumizing step of bonding the metal section and the composite material, an auxiliary tool which is hard, flat in bottom surface and acute in inclined plane to the bottom surface is placed at the edge of the metal section, the vertical surface of the auxiliary tool is tightly attached to the edge of the metal section, the bottom surface of the auxiliary tool is tightly attached to the composite material, and then the vacuumizing step is carried out; and taking out the auxiliary tool after the vacuumizing is completed.
2. The method for improving the quality of the surface of the metal section and the composite material through bonding according to claim 1, wherein the number of the auxiliary tools is the same as the number of the vertical surfaces of the metal section, and the height of the auxiliary tools is the same as the height of the vertical surfaces of the metal section.
3. The method for improving the surface quality of the adhesive joint of the metal profile and the composite material as claimed in claim 1, wherein the included angle between the inclined plane of the auxiliary tool and the bottom surface is 15-30 °.
4. The method for improving the quality of the bonding surface of the metal profile and the composite material according to claim 1, wherein the auxiliary tool is made of a high-temperature-resistant hard material.
5. The method for improving the quality of the bonding surface of the metal section and the composite material according to claim 4, wherein the auxiliary tool is made of one or a combination of a high-temperature-resistant metal, a high-temperature-resistant hard plastic and a laminated cloth plate.
6. The method for improving the quality of the surface of the metal section and the composite material through bonding according to claim 1, wherein after the auxiliary tool is placed, the auxiliary tool and the metal section are fixed in position through a pressure sensitive adhesive tape.
7. The method for improving the quality of the surface of the metal profile bonded with the composite material according to claim 1, which comprises the following steps:
step one, preparing an auxiliary tool according to the height and length of the side wall of the special metal section;
step two, sticking the adhesive surface of the special metal section by using an adhesive film, wherein the periphery of the adhesive film is slightly larger than the adhesive surface of the metal section;
thirdly, laying and cutting stripping cloth on the composite material skin according to the shape of the gluing surface of the special metal section, and then attaching the special metal section to a stripping cloth notch on the composite material skin;
placing the auxiliary tool close to the special metal section and fixing the auxiliary tool with the special metal section;
and fifthly, vacuumizing for curing, and taking out the auxiliary tool after curing.
8. The method for improving the surface quality of the bonding between the metal profile and the composite material according to claim 7, wherein after the auxiliary tool is taken out, the surface quality of the bonding assembly is checked, and redundant surface glue accumulation is removed by polishing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211196159.6A CN115958798A (en) | 2022-09-28 | 2022-09-28 | Method for improving adhesive surface quality of metal section and composite material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211196159.6A CN115958798A (en) | 2022-09-28 | 2022-09-28 | Method for improving adhesive surface quality of metal section and composite material |
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| CN115958798A true CN115958798A (en) | 2023-04-14 |
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| CN202211196159.6A Pending CN115958798A (en) | 2022-09-28 | 2022-09-28 | Method for improving adhesive surface quality of metal section and composite material |
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| WO2003026816A1 (en) * | 2001-09-20 | 2003-04-03 | The Foundation For The Promotion Of Industrial Science | Connected body and method for connection |
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| CN114953506A (en) * | 2022-05-24 | 2022-08-30 | 上海晟纤复合材料科技有限公司 | Co-curing forming method for I-shaped reinforced wall plate made of composite material |
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2022
- 2022-09-28 CN CN202211196159.6A patent/CN115958798A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2262321A1 (en) * | 1999-02-22 | 2000-08-22 | Marc Y. Savoie | Manufacturing ophthalmic lenses using lens structure cognition and spatial positioning system |
| KR20020039912A (en) * | 2000-11-22 | 2002-05-30 | 윤덕용 | Outside mold for manufacturing the composite guide beam |
| CA2617076A1 (en) * | 2001-01-25 | 2002-08-01 | Quickstep Technologies Pty. Ltd. | Composite and metal component production, forming and bonding system |
| US20040076771A1 (en) * | 2001-01-31 | 2004-04-22 | Giuseppe Marocco | Process for manufacturing composites and for struturally repairing and aesthetically filling slabs of stone materials |
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