CN114953506A - Co-curing forming method for I-shaped reinforced wall plate made of composite material - Google Patents
Co-curing forming method for I-shaped reinforced wall plate made of composite material Download PDFInfo
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- CN114953506A CN114953506A CN202210573464.6A CN202210573464A CN114953506A CN 114953506 A CN114953506 A CN 114953506A CN 202210573464 A CN202210573464 A CN 202210573464A CN 114953506 A CN114953506 A CN 114953506A
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000002131 composite material Substances 0.000 title claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 18
- 230000000903 blocking effect Effects 0.000 claims abstract description 10
- 239000000853 adhesive Substances 0.000 claims description 8
- 230000001070 adhesive effect Effects 0.000 claims description 8
- 238000003754 machining Methods 0.000 claims description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 4
- 241001589086 Bellapiscis medius Species 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 19
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 238000000465 moulding Methods 0.000 abstract description 6
- 238000004806 packaging method and process Methods 0.000 abstract description 5
- 238000009461 vacuum packaging Methods 0.000 abstract description 4
- 238000004140 cleaning Methods 0.000 abstract description 2
- 238000007711 solidification Methods 0.000 abstract 1
- 230000008023 solidification Effects 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 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
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- 238000010438 heat treatment Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
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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
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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
A co-curing molding method of a composite I-shaped reinforced wall plate relates to a co-curing molding method. The production method comprises the steps of utilizing prepreg to symmetrically lay preformed bodies between core moulds to be attached and combined in an I-shaped mode, manufacturing bottom edge oblique angles on two sides of the bottom of the preformed bodies, filling twirling strips in gaps of butt joints to form an I-shaped stringer blank, positioning the formed skin wallboard, demoulding and taking down the core moulds, matching and clamping soft films in grooves on two sides of the I-shaped stringer blank, placing top edge cover plates on two sides of a top edge after placing rubber blocking strips, externally paving and covering a wrapping vacuum bag for packaging, vacuumizing and compacting, placing two metal sections on two sides of the formed skin wallboard for positioning, using a process clamp for clamping, entering an autoclave for solidification and demoulding to obtain the I-shaped ribbed wallboard. The flexible mold replaces the traditional metal mold and the detailed design of the bottom edge bevel, vacuum packaging is adopted, the stringer edge-cleaning forming and the pressure uniform transmission are realized, and the composite material I-shaped reinforced wallboard is formed through one-time co-curing.
Description
Technical Field
The invention relates to a co-curing forming method, in particular to a co-curing forming method of an I-shaped reinforced wall plate made of a composite material, and belongs to the technical field of composite material manufacturing.
Background
With the development of composite material technology, the usage of aerospace composite materials is increasing year by year. The composite material stiffened wall panel is a common composite material structure in the aerospace field, wherein the structural efficiency of the I-shaped cross-section stringer is particularly outstanding, but compared with T-shaped, L-shaped and other cross-section stringers, the manufacture of the I-shaped cross-section stringer is relatively complex, and the common method is that the stringer is manufactured separately through a metal mold and machined to a net-size part, and then is subjected to co-bonding or secondary bonding with a skin to form the stiffened wall panel structure (refer to the attached figure 1 in the specification). However, the manufacturing method has a plurality of defects, the forming die of the stringer is generally a metal combined die, the processing period is long, the cost is high, the influence of the manufacturing precision and the deformation in the using process on the matching degree of the molded surface is large, the defects of dense pores and the like are easily generated, and the damage of overburning, layering and the like is easily caused by machining the edge of the stringer. In addition, the surface of the composite material is also prone to improper matching when the composite material and the skin are subjected to co-bonding or secondary bonding, the compression is uneven during curing, the bonding interface has the defects of layering, debonding and the like, and the manufacturing period and the manufacturing cost are greatly increased due to multiple times of curing and machining.
The defects seriously affect the popularization and application of the composite material I-shaped stiffened wall plate with higher structural efficiency, so the invention provides the co-curing forming method suitable for the composite material I-shaped stiffened wall plate, which can realize one-time co-curing forming, greatly improve the product quality, shorten the manufacturing period and reduce the manufacturing cost.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a co-curing forming method of a composite material I-shaped stiffened wall plate, which replaces the traditional metal mold and the detailed design of the bottom edge bevel angle of a stringer by a soft mold, adopts a vacuum bag for vacuum packaging, realizes the clear edge forming and the uniform pressure transmission of the stringer, and co-cures and forms the composite material I-shaped stiffened wall plate at one time, thereby improving the manufacturing efficiency, ensuring the internal quality and the consistency of products, being beneficial to reducing the manufacturing cost and shortening the manufacturing period.
In order to achieve the purpose, the invention adopts the following technical scheme: a co-curing forming method of a composite I-shaped reinforced wall plate comprises the following steps:
the method comprises the following steps: demolding a core mold for later use, wherein the core mold comprises two rod bodies which are horizontally arranged in parallel and have rectangular chamfer sections;
step two: a left side shaped preformed body and a right side shaped preformed body are symmetrically laid between core moulds by using prepreg, the left side shaped preformed body and the right side shaped preformed body are in I-shaped leaning combination, and bottom edge oblique angles are manufactured on two sides of the bottom of the I-shaped body;
step three: filling twister strips formed by rolling prepreg into R-angle splicing gaps at the upper and lower ends of butt joints of the left-side [ shaped preformed body and the right-side [ shaped preformed body respectively to form an I-shaped stringer blank;
step four: positioning the I-shaped stringer blank at a position corresponding to the spread skin wallboard, demolding and taking down the core mold;
step five: demolding a soft film, wherein the soft film comprises two split die bodies of a shape and a shape, and inclined planes matched with the inclined angles of the bottom edges are processed at the bottom edges of the two split die bodies;
step six: two split die bodies for clamping the soft film are matched and arranged in grooves on two sides of the I-shaped stringer blank, adhesive blocking strips are arranged on two sides of the top edge of the I-shaped stringer blank, top edge cover plates are arranged on the adhesive blocking strips on the top and two sides of the I-shaped stringer blank, and then a wrapping vacuum bag is laid outside for packaging and vacuumizing and compacting;
step seven: placing two metal sections on two sides of the outside of the vacuum bag to position the soft film and the I-shaped stringer blank, and clamping the two metal sections by using a process clamp to ensure the axial degree of the I-shaped stringer blank;
step eight: and (3) entering an autoclave to be cured according to prepreg process parameters, taking down the process clamp, the metal section 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-cured and molded I-shaped reinforced wall plate.
Compared with the prior art, the invention has the beneficial effects that: the invention realizes one-time co-curing molding of the I-shaped stiffened wall plate by a special packaging method, adopts a soft mold to replace a traditional metal mold, manufactures bottom edge oblique angles on two sides of the bottom of an I-shaped stringer blank which is laid by prepreg, processes an inclined plane matched with the bottom edge oblique angles on the bottom edge of the soft mold, and adopts a vacuum bag to carry out vacuum packaging, thereby realizing clean edge molding of the stringer and uniform pressure transmission, reducing the machining and gluing processes of the stringer, improving the manufacturing efficiency, ensuring the internal quality and the product consistency of the product, having the characteristics of flexibility and practicality, having low cost, easy operation and easy demoulding, reducing the times of tank feeding curing and the machining workload, obviously reducing the manufacturing cost and shortening the manufacturing period.
Drawings
FIG. 1 is an axial view of a conventional I-shaped stiffened wall panel;
FIG. 2 is a schematic end view of a formed web of I-beam stock of the present invention;
FIG. 3 is an axial schematic view of the flexible membrane of the present invention;
FIG. 4 is an axial schematic view of the inventive I-beam blank in a condition of being laid over and wrapped with a vacuum bag;
FIG. 5 is a schematic view of the I-beam blank of the present invention as it is being positioned through a metal section;
FIG. 6 is an enlarged view of a portion of FIG. 5;
fig. 7 is an axial view of the i-shaped stiffened wall panel of the present invention.
Detailed Description
The technical solutions in the embodiments 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 obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments, and based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
As shown in fig. 2 to 7, a co-curing molding method of a composite I-shaped stiffened wall panel comprises the following steps:
the method comprises the following steps: referring to fig. 2, a core mold 1 is subjected to demolding treatment for standby, wherein the core mold 1 comprises two rod bodies which are horizontally arranged in parallel and have rectangular cross sections and are provided with chamfers, and is used for laying a prepreg shaped and combined I-shaped stringer blank 6, and the demolding treatment can be realized by coating a demolding agent on the core mold 1 or attaching single-side adhesive tetrafluoro cloth;
step two: referring to fig. 2 and 4, a left-side ] shaped preformed body 2 and a right-side [ shaped preformed body 3 are symmetrically laid between core dies 1 by using prepreg through methods of manual laying or automatic laying plus thermal diaphragm, the left-side ] shaped preformed body 2 and the right-side [ shaped preformed body 3 are in I-shaped attached combination, bottom edge bevel angles 4 are manufactured on two sides of the bottom of the I-shaped body, the bottom edge bevel angles 4 can be manufactured by machining, ultrasonic cutting or thermal diaphragm forming methods, the angle is 25-45 degrees, the bottom edge bevel angles are matched with the bevel of a subsequent soft film 8 to avoid structure mutation, and uniform transmission of curing pressure is guaranteed;
step three: referring to fig. 2, splicing gap positions of R angles at the upper and lower ends of a butt seam of a left-side [ shaped ] preform 2 and a right-side [ shaped ] preform 3 are respectively filled with twister strips 5 formed by rolling prepreg, combined into an I-shaped stringer blank 6, and co-cured with a skin wallboard 7 to form an I-shaped stiffened wallboard 14;
step four: referring to fig. 4, positioning the I-shaped stringer blank 6 at a position corresponding to the laid skin panel 7 and demolding to remove the core mold 1;
step five: referring to fig. 3, a flexible film 8 is subjected to demolding treatment, the flexible film 8 comprises two split mold bodies of a shape and a shape, and can be manufactured by means of cutting or hot pressing of a customized piece, the bottom edges of the two split mold bodies are provided with inclined planes matched with the bottom edge oblique angles 4, so that structure mutation is avoided, and uniform transmission of curing pressure is ensured, wherein the demolding treatment can be carried out by compounding a polytetrafluoroethylene film on the surface of the flexible film 8, coating teflon with glue or coating a demolding agent;
step six: referring to fig. 4, two split die bodies for clamping the soft film 8 are matched and arranged in grooves on two sides of the I-shaped stringer blank 6, adhesive blocking strips 9 are arranged on two sides of the top edge of the I-shaped stringer blank 6, a top edge cover plate 10 is arranged on the top of the I-shaped stringer blank 6 and the adhesive blocking strips 9 on the two sides, and then a wrapping vacuum bag 11 is laid on the outside for packaging, vacuumizing and compacting, so that the soft 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 on two sides of the outside 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. 6-7, the blank is placed into an autoclave to be cured according to prepreg process parameters, the heating rate is kept at 1-2 ℃/min, the curing temperature is kept at 120-180 ℃, the heat preservation time is kept for 3-6 h, after the curing is finished, the process clamp 13, the metal section bar 12 and the vacuum bag 11 are taken down, the top edge cover plate 10, the glue blocking strip 9 and the soft film 8 are demolded, the H-shaped reinforced wall plate 14 formed through co-curing is obtained, finally, the H-shaped long truss top edge and the wall plate edge of the H-shaped reinforced wall plate 14 are machined according to drawing requirements, nondestructive and profile detection is carried out, and the condition can be met.
The method realizes one-time co-curing molding of the I-shaped reinforced wall plate 14 by a special packaging method, reduces the processing and gluing process of a stringer, the method has the advantages of improving the manufacturing efficiency, ensuring the internal quality and the consistency of the product, reducing the times of tank feeding and curing and the machining workload, obviously reducing the manufacturing cost and shortening the manufacturing period, along with flexible and practical characteristics, low cost, easy operation and easy demoulding, adopts the soft film 8 to replace the traditional metal mould, adopts the detailed design of the bottom edge bevel angle 4, and carries out vacuum packaging through the vacuum bag 11, the pressure of the autoclave can be completely transmitted to the surface of the composite material part to be cured, the stringer edge-cleaning forming and the pressure uniform transmission are realized, the uniform pressure effect is good, the forming quality of the I-shaped stringer blank 6 is ensured, and the defects that the traditional metal tool is complex in structure, long in processing period, high in cost, easy to deform, uneven in pressure transmission and difficult to realize co-curing forming are overcome. In addition, the method can realize the operation of co-curing and forming the stiffened wall panel by the stringers with L-shaped and T-shaped sections through simple replacement of the core mould 1 and the soft film 8, can also be used for separately forming the clear side stringers of the co-bonded stiffened wall panel, and also 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 attributes 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 description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A co-curing forming method of a composite I-shaped reinforced wall plate is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: demolding the core mold (1) for standby, wherein the core mold (1) comprises two rod bodies which are horizontally arranged in parallel and have rectangular chamfered sections;
step two: a left side shaped preformed body (2) and a right side shaped preformed body (3) are symmetrically laid between a core mold (1) by using prepreg, the left side shaped preformed body (2) and the right side shaped preformed body (3) are in I-shaped sticking combination, and bottom edge bevel angles (4) are manufactured on two sides of the bottom of the I-shaped body;
step three: filling twister strips (5) formed by rolling prepreg into R-angle splicing gaps at the upper and lower ends of a butt seam of the left-side [ shaped preformed body (2) and the right-side [ shaped preformed body (3) respectively to form an I-shaped stringer blank (6);
step four: positioning the H-shaped stringer blank (6) at a position corresponding to the laid skin wallboard (7), and demolding to take down the core mold (1);
step five: demolding the soft film (8), wherein the soft film (8) comprises two split die bodies in a shape of [ J ] and [ E ], and inclined planes matched with the bottom edge bevel angles (4) are processed at the edges of the bottoms of the two split die bodies;
step six: two split die bodies of a soft film (8) are clamped in grooves on two sides of an I-shaped stringer blank (6) in a matched mode, adhesive 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 adhesive blocking strips (9) on the top and two sides of the I-shaped stringer blank (6), and then an attached vacuum bag (11) is laid and wrapped outside to be packaged, vacuumized and compacted;
step seven: two metal profiles (12) are placed on two outer sides of the vacuum bag (11) to position the soft film (8) and the I-shaped stringer blank (6), and the two metal profiles (12) are clamped by a process clamp (13), so that the axial degree of the I-shaped stringer blank (6) is ensured;
step eight: and (3) putting the blank into an autoclave to be cured according to the prepreg process parameters, taking down the process clamp (13), the metal section bar (12) and the vacuum bag (11) after curing is finished, and demolding the top edge cover plate (10), the glue blocking strip (9) and the soft film (8) to obtain the co-cured and molded I-shaped reinforced wall plate (14).
2. The co-curing forming method of the composite I-shaped reinforced wall plate according to claim 1, characterized in that: in the first step, demoulding treatment is to coat a demoulding agent on the core mould (1) or paste single-side PTFE (polytetrafluoroethylene) with glue.
3. The co-curing forming method of the composite I-shaped reinforced wall plate according to claim 1, characterized in that: in the second step, the bottom edge bevel (4) is manufactured by adopting a machining, ultrasonic cutting or thermal diaphragm forming method, and the angle of the bottom edge bevel (4) is 25-45 degrees.
4. The co-curing forming method of the composite I-shaped reinforced wall plate according to claim 1, characterized in that: and in the step five, demolding treatment is to compound a polytetrafluoroethylene film on the surface of the soft film (8), coat the PTFE cloth with the rubber or coat a demolding agent.
5. The co-curing forming method of the composite I-shaped reinforced wall plate according to claim 1, characterized in that: and step eight, curing in an autoclave at a temperature of 120-180 ℃ for 3-6 h, wherein the temperature rise rate is kept at 1-2 ℃/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210573464.6A CN114953506B (en) | 2022-05-24 | Co-curing forming method for composite material I-shaped reinforced wallboard |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210573464.6A CN114953506B (en) | 2022-05-24 | Co-curing forming method for composite material I-shaped reinforced wallboard |
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| CN114953506A true CN114953506A (en) | 2022-08-30 |
| CN114953506B CN114953506B (en) | 2024-04-19 |
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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 |
| CN117162539A (en) * | 2023-11-02 | 2023-12-05 | 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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN117162539A (en) * | 2023-11-02 | 2023-12-05 | 成都泰格尔航天航空科技股份有限公司 | Compacting device and production process thereof |
| 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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