CN114953506B - Co-curing forming method for composite material I-shaped reinforced wallboard - Google Patents
Co-curing forming method for composite material I-shaped reinforced wallboard Download PDFInfo
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- CN114953506B CN114953506B CN202210573464.6A CN202210573464A CN114953506B CN 114953506 B CN114953506 B CN 114953506B CN 202210573464 A CN202210573464 A CN 202210573464A CN 114953506 B CN114953506 B CN 114953506B
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 18
- 238000000465 moulding Methods 0.000 claims abstract description 13
- 230000000903 blocking effect Effects 0.000 claims abstract description 10
- 238000004806 packaging method and process Methods 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 239000000853 adhesive Substances 0.000 claims description 9
- 230000001070 adhesive effect Effects 0.000 claims description 9
- 238000003754 machining Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 3
- 230000035772 mutation Effects 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims 1
- 239000003292 glue Substances 0.000 claims 1
- 230000000630 rising effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 17
- 238000009461 vacuum packaging Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 6
- 238000012546 transfer Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000005056 compaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
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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
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
-
- 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
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/345—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using matched moulds
-
- 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
A co-curing molding method of a composite material I-shaped reinforced wallboard relates to a co-curing molding method. Symmetrically paving the preformed body between the core molds by utilizing prepregs, pasting and combining the preformed body according to an I shape, manufacturing bottom edge oblique angles at two sides of the bottom, filling twisted strips in gaps of joints, combining into an I-shaped stringer blank, positioning a skin wall plate, demolding, taking down the core mold, clamping soft films in grooves at two sides of the I-shaped stringer blank in a matched mode, placing a top edge cover plate after placing a rubber blocking strip at two sides of the top edge, paving and wrapping a vacuum bag outside, packaging, vacuumizing and compacting, placing two metal profiles at two sides for positioning, clamping by using a technical clamp, and demolding after curing in an autoclave to obtain the I-shaped reinforced wall plate. The traditional metal mold and the detail design of the bottom edge bevel angle are replaced by the soft mold, vacuum packaging is adopted, net edge forming and pressure uniform transmission of the stringers are achieved, and the composite material I-shaped reinforced wallboard is formed by one-time co-curing.
Description
Technical Field
The invention relates to a co-curing forming method, in particular to a co-curing forming method for an I-shaped reinforced wallboard of a composite material, and belongs to the technical field of composite material manufacturing.
Background
With the development of composite material technology, the use level of aerospace composite materials is increased year by year. The composite reinforced wallboard is a common composite material structure in the aerospace field, wherein the structural efficiency of the stringer with the I-shaped cross section is particularly remarkable, but compared with the stringers with T-shaped and L-shaped cross sections, the stringer with the I-shaped cross section is relatively complex to manufacture, and the stringer is manufactured by a metal mould independently and mechanically processed to a net-size part, and then is bonded together with a skin or bonded secondarily to form the reinforced wallboard structure (shown in figure 1 of the specification). However, the manufacturing method has a plurality of defects, the molding die of the stringer is generally a metal combined die, the processing period is long, the cost is high, the influence of the deformation in the manufacturing precision and the use process on the profile matching degree is large, the defects of dense pores and the like are easily caused, and the edge machining of the stringer is also easy to cause the damage of overburning, layering and the like. In addition, the adhesive joint or secondary adhesive joint is easy to cause improper matching of the molded surface and uneven compression during curing, so that the adhesive joint interface has defects of layering, debonding and the like, and the manufacturing period and the manufacturing cost are greatly increased by repeated curing and machining.
The defect seriously affects popularization and application of the composite material I-shaped reinforced wallboard with higher structural efficiency, so the invention provides a method suitable for co-curing and forming of the composite material I-shaped reinforced wallboard, which can realize one-time co-curing and forming, greatly improve product quality, shorten manufacturing period and reduce manufacturing cost.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a co-curing molding method of a composite material I-shaped reinforced wallboard, which replaces the traditional metal mold and the detail design of the bevel angle of the bottom edge of a stringer by a soft mold, adopts a vacuum bag for vacuum packaging, realizes net edge molding and uniform pressure transmission of the stringer, ensures the internal quality and consistency of the product while improving the manufacturing efficiency, and is beneficial to reducing the manufacturing cost and shortening the manufacturing period.
In order to achieve the above purpose, the invention adopts the following technical scheme: a co-curing molding method of a composite material I-shaped reinforced wallboard comprises the following steps:
Step one: demolding a core mold for standby, wherein the core mold comprises two rod bodies with cross sections of chamfer rectangles which are horizontally arranged in parallel;
step two: symmetrically laying a left side [ shape preformed body and a right side [ shape preformed body ] between the core dies by utilizing prepreg, wherein the left side [ shape preformed body and the right side [ shape preformed body are in I-shaped abutting combination, and bottom edge bevel angles are manufactured on two sides of the bottom of the I shape;
Step three: respectively filling the R angle splicing gap positions of the upper end and the lower end of the butt joint of the left side [ shape preformed body ] and the right side [ shape preformed body ] with twisted strips formed by prepreg rolling to form an I-shaped stringer blank;
Step four: positioning the I-shaped stringer blank at a corresponding position of the laid skin panel and demolding and removing the core mold;
step five: demolding the soft film, wherein the soft film comprises two split mold bodies in a shape of [ and inclined planes matched with the bottom edge oblique angles are processed at the bottom edges of the two split mold bodies;
Step six: two split mold bodies for clamping a soft film are matched in grooves on two sides of the I-shaped stringer blank, rubber blocking strips are placed on two sides of the top edge of the I-shaped stringer blank, top edge cover plates are placed on the top of the I-shaped stringer blank and the rubber blocking strips on two sides of the I-shaped stringer blank, and then vacuum bags are covered and wrapped outside for packaging, and vacuum pumping and compaction are carried out;
step seven: placing two metal profiles at two sides outside the vacuum bag to position the flexible film and the I-shaped stringer blank, and clamping the two metal profiles by using a process clamp to ensure the axiality of the I-shaped stringer blank;
Step eight: and (3) entering an autoclave for curing according to the prepreg technological parameters, taking down the technological clamp, the metal section bar and the vacuum bag after curing is finished, and demolding the top edge cover plate, the adhesive blocking strip and the soft film to obtain the co-curing and molded I-shaped reinforced wallboard.
Compared with the prior art, the invention has the beneficial effects that: the invention realizes the one-time co-curing molding of the I-shaped reinforced wallboard through a special packaging method, adopts a soft mold to replace the traditional metal mold, makes a bottom edge bevel angle at two sides of the bottom of the I-shaped stringer blank paved by prepreg, processes an inclined plane matched with the bottom edge bevel angle at the bottom edge of the soft mold, adopts a vacuum bag to carry out vacuum packaging, realizes the net edge molding of the stringer and the uniform pressure transmission, reduces the processes of processing and cementing of the stringer, improves the manufacturing efficiency, ensures the internal quality and the consistency of the product, has the characteristics of flexibility and practicability, has low cost, easy operation and easy demolding, reduces the curing times and machining workload of entering a tank, obviously reduces the manufacturing cost and shortens the manufacturing period.
Drawings
FIG. 1 is a schematic isometric view of a prior art I-ribbed wallboard;
FIG. 2 is a schematic view of a formed end view of an I-stringer blank of the present invention;
FIG. 3 is a schematic illustration of an isometric view of a flexible membrane of the present invention;
FIG. 4 is a schematic illustration of an axial view of an H-stringer blank of the present invention with a vacuum bag applied thereto;
FIG. 5 is a schematic illustration of an axial view of an H-beam blank of the present invention positioned through a metal profile;
FIG. 6 is an enlarged view of a portion of FIG. 5;
fig. 7 is an isometric view of an i-ribbed wallboard of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are all within the protection scope of the present invention.
As shown in fig. 2 to 7, the co-curing and forming method of the composite material I-shaped reinforced wallboard comprises the following steps:
step one: referring to fig. 2, a core mold 1 is subjected to demolding treatment for standby, wherein the core mold 1 comprises two rod bodies with chamfered rectangles in cross section, which are horizontally arranged in parallel, and the rod bodies are used for laying prepreg and shaping combined I-shaped stringer blanks 6, and the demolding treatment can be realized by coating the core mold 1 with a demolding agent or pasting single-sided adhesive tetrafluoro cloth;
step two: referring to fig. 2 and 4, a left side [ shape preformed body 2 and a right side [ shape preformed body 3 are symmetrically paved between core dies 1 by utilizing prepregs through methods of manual paving or automatic paving, hot diaphragm paving and the like, the left side [ shape preformed body 2 and the right side [ shape preformed body 3 are in an I-shaped leaning combination, bottom edge bevel angles 4 are manufactured on two sides of the bottom of the I shape, the bottom edge bevel angles 4 can be manufactured by adopting a machining, ultrasonic cutting or hot diaphragm forming method, the angles are 25-45 degrees, and structural mutation is avoided by matching with inclined surfaces of a follow-up soft film 8, so that even transmission of curing pressure is ensured;
Step three: referring to fig. 2, R-angle splice gaps at the upper and lower ends of the butt joint between the left-side preform 2 and the right-side preform 3 are respectively filled with twisted strips 5 formed by prepreg rolling, combined into an i-shaped stringer blank 6, and co-cured with a skin panel 7 to form an i-shaped stiffened panel 14;
Step four: referring to fig. 4, the i-stringer blank 6 is positioned in a corresponding location to the laid skin panel 7 and the core mold 1 is demolded;
Step five: referring to fig. 3, the soft film 8 is subjected to demolding treatment, wherein the soft film 8 comprises two split mold bodies [ shape ] and [ shape ], the two split mold bodies can be manufactured in a mode of cutting or hot pressing a customized piece, the bottom edges of the two split mold bodies are processed with inclined planes matched with the bottom edge bevel 4, the structure mutation is avoided, the uniform transfer of the curing pressure is ensured, and the demolding treatment can be realized by compounding a polytetrafluoroethylene film, coating with adhesive tetrafluorocloth or coating with a demolding agent on the surface of the soft film 8;
Step six: referring to fig. 4, two split mold bodies for clamping the flexible film 8 are matched in grooves on two sides of the i-shaped stringer blank 6, rubber blocking strips 9 are placed on two sides of the top edge of the i-shaped stringer blank 6, top edge cover plates 10 are placed on the top of the i-shaped stringer blank 6 and the rubber blocking strips 9 on two sides, and then vacuum bags 11 are covered and wrapped outside for packaging, vacuumizing and compacting are carried out, so that the flexible film 8 is completely attached to the i-shaped stringer blank 6;
step seven: referring to fig. 5 to 6, two metal profiles 12 are placed at two sides of the outer part of the vacuum bag 11 to position the flexible membrane 8 and the i-shaped stringer blank 6, and the two metal profiles 12 are clamped by a process clamp 13 to ensure the axial degree of the i-shaped stringer blank 6;
Step eight: referring to fig. 6 to 7, the mixture is put into an autoclave to be cured according to the technological parameters of the prepreg, the heating rate is kept at 1-2 ℃/min, the curing temperature is kept at 120-180 ℃, the heat preservation time is 3-6 h, after the curing is completed, the technological clamp 13, the metal section 12 and the vacuum bag 11 are taken down, the top edge cover plate 10, the adhesive blocking strip 9 and the soft film 8 are demolded, the co-cured and formed I-shaped reinforced wallboard 14 is obtained, finally, the top edge and the wallboard edge of the I-shaped stringer of the I-shaped reinforced wallboard 14 are machined according to the drawing requirements, nondestructive and profile detection are carried out, and the method can be applied to meeting the conditions.
The method realizes the primary co-curing molding of the I-shaped reinforced wallboard 14 by a special packaging method, reduces the processes of girder machine addition and cementing, ensures the internal quality and the consistency of products, reduces the curing times and machining workload of can feeding, obviously reduces the manufacturing cost and shortens the manufacturing period, has the characteristics of flexibility and practicability, is low in cost, easy to operate and easy to demold, adopts the soft film 8 to replace the traditional metal mold, adopts the detail design of the bottom edge bevel angle 4, can completely transfer the pressure of an autoclave to the surface of a composite material part to be cured by vacuum bag 11 for vacuum packaging, realizes the net edge molding and pressure uniform transfer of the girders, has good uniform pressure effect, ensures the molding quality of the I-shaped girder blank 6, and overcomes the defects of complicated structure, long processing period, high cost, variability, uneven pressure transfer and difficulty in realizing co-curing molding of the traditional metal tool. In addition, the method of the invention can realize the operation of co-curing and forming the reinforced wallboard by the stringers with L-shaped and T-shaped cross sections through the simple replacement of the core mold 1 and the soft film 8, and can also be used for independently forming the clean-edge stringers of the co-glued wallboard, and the method belongs to the protection scope of the invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (4)
1. A co-curing molding method of a composite material I-shaped reinforced wallboard is characterized by comprising the following steps of: the method comprises the following steps:
Step one: demolding a core mold (1) for standby, wherein the core mold (1) comprises two rod bodies with cross sections of chamfer rectangles which are horizontally arranged in parallel;
Step two: symmetrically laying a left side [ shape preformed body (2) and a right side [ shape preformed body (3) between core dies (1) by using prepregs, wherein the left side [ shape preformed body (2) and the right side [ shape preformed body (3) are in I-shaped abutting combination, bottom edge bevel angles (4) are manufactured on two sides of the bottom of the I shape, the bottom edge bevel angles (4) are manufactured by adopting a machining, ultrasonic cutting or thermal diaphragm forming method, the bottom edge bevel angles (4) are 25-45 degrees, and structural mutation is avoided by matching with inclined planes of a follow-up soft film (8), so that even transmission of curing pressure is ensured;
Step three: r angle splicing gap positions of the left side [ shape preformed body (2) and the right side [ shape preformed body (3) at the upper end and the lower end of the butt joint are respectively filled with a twisted strip (5) formed by prepreg rolling, and an I-shaped stringer blank (6) is formed;
step four: positioning the I-shaped stringer blank (6) at a position corresponding to the paved skin panel (7) and demolding and removing the core mold (1);
step five: demolding the soft film (8), wherein the soft film (8) comprises two split mold bodies in a shape of [ and inclined planes matched with the bottom edge bevel (4) are processed at the bottom edges of the two split mold bodies;
Step six: two split mold bodies for clamping the soft film (8) are matched in grooves on two sides of the I-shaped stringer blank (6), rubber blocking strips (9) are placed on two sides of the top edge of the I-shaped stringer blank (6), top edge cover plates (10) are placed on the top of the I-shaped stringer blank (6) and the rubber blocking strips (9) on two sides, and then vacuum bags (11) are covered and wrapped outside for packaging, vacuumizing and compacting;
step seven: two metal profiles (12) are placed at two sides outside the vacuum bag (11) to position the soft film (8) and the H-shaped stringer blank (6), and the two metal profiles (12) are clamped by using a process clamp (13) to ensure the axial degree of the H-shaped stringer blank (6);
Step eight: and (3) entering an autoclave for curing according to the prepreg technological parameters, taking down the technological clamp (13), the metal section bar (12) and the vacuum bag (11) after curing is completed, and demolding the top edge cover plate (10), the adhesive blocking strip (9) and the soft film (8) to obtain the co-curing-molded I-shaped reinforced wallboard (14).
2. The co-curing and forming method for the composite material I-shaped reinforced wallboard of claim 1, wherein the method comprises the following steps of: and in the first step, the demolding treatment is to coat the core mold (1) with a demolding agent or paste single-sided adhesive tetrafluoro cloth.
3. The co-curing and forming method for the composite material I-shaped reinforced wallboard of claim 1, wherein the method comprises the following steps of: and in the fifth step, the demolding treatment is to compound a polytetrafluoroethylene film on the surface of the soft film (8), coat the polytetrafluoroethylene cloth with glue or coat a demolding agent.
4. The co-curing and forming method for the composite material I-shaped reinforced wallboard of claim 1, wherein the method comprises the following steps of: and step eight, curing in an autoclave, keeping the temperature rising rate at 1-2 ℃/min, curing at 120-180 ℃ and keeping the temperature for 3-6 h.
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| CN115958798A (en) * | 2022-09-28 | 2023-04-14 | 陕西飞机工业有限责任公司 | Method for improving adhesive surface quality of metal section and composite material |
| CN117162539B (en) * | 2023-11-02 | 2024-02-06 | 成都泰格尔航天航空科技股份有限公司 | Compacting device and production process thereof |
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| CN113547763A (en) * | 2021-07-27 | 2021-10-26 | 中航西安飞机工业集团股份有限公司 | Forming device and forming method for double-sided T-shaped reinforced wall plate |
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