CN111645341A - Method for controlling curing deformation of composite material reinforced wall plate - Google Patents
Method for controlling curing deformation of composite material reinforced wall plate Download PDFInfo
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- CN111645341A CN111645341A CN202010528985.0A CN202010528985A CN111645341A CN 111645341 A CN111645341 A CN 111645341A CN 202010528985 A CN202010528985 A CN 202010528985A CN 111645341 A CN111645341 A CN 111645341A
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- prepreg
- stringer
- lubricating
- wall plate
- reinforced wall
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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
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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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention relates to a method for controlling the curing deformation of a composite material reinforced wallboard, wherein the composite material reinforced wallboard comprises a composite material skin and a composite material stringer structure, and the method comprises the following steps: laying skin prepreg on the reinforced wall plate mould base, and curing and molding; separating the cured skin from the reinforced wall plate mould, firstly laying a layer of isolating film on the reinforced wall plate mould, laying a lubricating prepreg on the isolating film, then laying a layer of isolating film, fixing the isolating film on the reinforced wall plate mould, and placing the cured skin on the isolating film on the upper layer; paving stringer prepreg on a stringer core mould, combining the stringer core mould and the stringer core mould into a stringer, and placing the stringer core mould and the stringer core mould on a cured skin according to a preset position to form a reinforced wallboard integral blank; packaging the combined integral blank of the stiffened wall plate by using a vacuum bag, curing, and reducing stress deformation in the process of curing the integral blank of the stiffened wall plate by using the lubricating effect of a lubricating prepreg; and finally, removing the packaging material, and demolding the cured reinforced wall plate.
Description
Technical Field
The invention relates to the technical field of composite material part manufacturing, in particular to a method for controlling the curing deformation of a composite material reinforced wall plate.
Background
The composite material has the characteristics of high specific strength, high specific modulus, low density and the like, and is widely applied to the field of aerospace, but after the composite material part is formed, the composite material part is cured and deformed under the action of internal stress, so that the structural precision is influenced. The curing deformation of the composite material reinforced wall plate mainly comprises two reasons: 1) phase change and chemical transformation in the resin curing process form large residual stress in the part, and the residual stress causes the part to generate curing deformation in a free state; 2) the mould expands with the temperature, the composite material part on the mould expands with the mould, and when the mould is cooled after solidification, the shrinkage rates of the resin, the fiber and the mould are different, so that the internal stress is introduced. The curing deformation can have serious influence on large-scale composite material parts in aviation, on one hand: the curing deformation of the composite material part enables the manufactured part to deviate from the theoretical appearance, the assembly surface deviates from the assembly fixture, assembly interference is caused, forced assembly connection under large stress can be adopted, and the large stress existing at the connection position influences the overall strength of the structure; on the other hand, when the complex cementing structure composite material part containing multiple components is manufactured, the solidification deformation can cause stronger interface stress, so that the interface stress can cause the expansion of internal defects in the use process of the composite material part in a severe environment, the whole structure is invalid, and the safety of an aircraft is influenced.
The prior measures for solving the curing deformation of the composite material reinforced wall plate comprise the following steps: 1) a low-temperature curing material system is selected, but the heat resistance of the manufactured part is generally poor; 2) a co-curing molding process is selected, all components of the part are cured simultaneously, but a more complex process and higher molding risks are brought; 3) the mould material with the thermal expansion coefficient equivalent to that of the composite material is selected, generally invar material, the material cost is high, and the manufacturing cost of the composite material part is greatly increased.
Disclosure of Invention
(1) Technical problem to be solved
The invention provides a method for controlling the curing deformation of a composite material reinforced wall plate, which solves the technical problem of curing deformation of composite material parts in the prior art. The method has the characteristics of low cost, high efficiency, simple and convenient operation, wide application range and the like, can be suitable for a high-temperature forming material system, can be applied to a common carbon steel die and various composite material part forming processes, reduces the process manufacturing risk and lowers the die cost.
(2) Technical scheme
The embodiment of the invention provides a method for controlling the curing deformation of a composite material reinforced wallboard, wherein the composite material reinforced wallboard comprises a composite material skin and a composite material stringer structure, and the method at least comprises the following steps:
step S110, paving skin prepreg on the metal reinforced wall plate mould base according to a preset paving layer, and curing and molding;
step S120, enabling the cured skin to be separated from the reinforced wall plate mould, firstly laying a layer of isolating film on the reinforced wall plate mould, then laying a lubricating prepreg on the isolating film, laying a layer of isolating film on the lubricating prepreg, fixing the isolating film-lubricating prepreg-isolating film on the reinforced wall plate mould, and placing the cured skin on the isolating film on the upper layer;
step S130, cutting stringer prepreg according to the stringer structure laying layer of the stiffened wall panel, laying the stringer prepreg on a stringer core mold to combine a stringer, and then placing the stringer and the stringer core mold on a cured skin according to a preset position to form an integral blank body of the stiffened wall panel;
step 140, packaging the combined integral blank of the stiffened wall plate by using a vacuum bag, curing according to a preset process, and reducing stress deformation in the process of curing the integral blank of the stiffened wall plate by using the lubricating effect of a lubricating prepreg;
and 150, removing the packaging material, and demolding the cured reinforced wall plate.
Further, in step S120, the lubricating prepreg is formed by compounding unidirectional fibers and resin, and the thickness of the laid lubricating prepreg is not more than 0.2 mm.
Further, the unidirectional fiber is glass fiber, carbon fiber or aramid fiber.
Further, the resin is epoxy resin, bismaleimide resin, polyimide resin or liquid rubber, and the weight content of the resin in the lubricating prepreg is 25-35%.
Further, in step S120, the 0 ° laying direction of the lubricating prepreg on the release film is perpendicular to the rib stringer direction.
Further, in the step S120, the thickness of the isolation film material is not greater than 0.1mm, the isolation film material does not chemically react with the material of the lubricating prepreg, and the isolation film is separated from the lubricating prepreg after the curing process is finished.
Further, in step S140, the resin viscosity in the lubricating prepreg is less than 10Pa · S before the stringer prepreg gels.
Further, in step S130, the cross section of the stiffened wall panel is a stringer structure having a shape of i, T, L, H, C, J, or K.
Further, in step S140, the lubricating prepreg does not undergo a polymerization reaction during the curing process of the integral blank of the stiffened wall panel.
(3) Advantageous effects
In summary, the invention provides a method for controlling the curing deformation of a composite material reinforced wall plate, which utilizes the lubricating and isolating effect of a lubricating prepreg layer to form a low-viscosity resin diaphragm between a composite material skin and a metal mold. The lubricating prepreg layer does not generate polymerization reaction per se, the lower resin viscosity can be kept in the whole process of curing the composite material reinforced wall plate, the fibers vertical to the stringer direction generate a roller effect, the composite material skin is kept relatively free, the friction coefficient between the composite material skin and a mold is reduced, and the tensile stress generated by the composite material skin along with the expansion of the mold is reduced. During cooling, the composite material part and the die are cooled respectively according to the linear expansion coefficients of the composite material part and the die under the isolation of the lubricating layer, and the linear expansion coefficients are not influenced mutually.
The method can be suitable for molding composite material parts on dies with high expansion coefficients such as carbon steel, the deformation degree of the composite material parts molded by the method is not influenced by the expansion coefficient of the die materials, the conditions of large deformation and the like of the composite material parts caused by thermal expansion of the dies are avoided particularly when the composite material parts with large complex structures are molded, and the requirement on high-precision control of the curing deformation of the molded surface can be met. Meanwhile, the composite material part forming die can use more extensive and cheap die materials, so that the die cost is reduced, and the composite material part forming die is suitable for various forming process methods of composite material parts, and the process manufacturing risk is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of an outer shape of a drum-shaped composite material reinforced wall panel according to an embodiment of the present invention.
Fig. 2 is a schematic view of the combination of the I-shaped reinforced composite material wall plate and the mold.
FIG. 3 is a schematic cross-sectional view of the lay-up of stringer prepreg onto a stringer mandrel.
Fig. 4 is a schematic cross-sectional view of a spar structure.
Fig. 5 is a sectional view of the combination of the I-shaped reinforced composite material wall plate and the mold.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, alterations, and improvements in the parts, components, and connections without departing from the spirit of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The invention provides a method for controlling the curing deformation of a composite material reinforced wallboard, wherein the composite material reinforced wallboard comprises a composite material skin and a composite material stringer structure, and the method comprises the following steps of S110-S150:
and step S110, paving skin prepreg on the metal reinforced wall plate mould tire according to a preset paving layer, and curing and molding.
Step S120, enabling the cured skin to be separated from the reinforced wall plate mould, firstly laying a layer of isolating film on the reinforced wall plate mould, then laying a lubricating prepreg on the isolating film, laying a layer of isolating film with the thickness not more than 0.1mm on the lubricating prepreg, fixing the isolating film-lubricating prepreg-isolating film on the reinforced wall plate mould, placing the cured skin on the isolating film on the upper layer, and positioning.
In this step S120, the laying direction of the lubricating prepreg is perpendicular to the rib stringer direction. The lubricating prepreg is formed by compounding unidirectional fibers and resin, the thickness of the lubricating prepreg is not more than 0.2mm, and the unidirectional fibers can be glass fibers, carbon fibers or aramid fibers; the resin may be an epoxy resin, a bismaleimide resin, a polyimide resin, or a liquid rubber. The weight content of the resin in the lubricating prepreg is 25-35%, and the material does not generate polymerization reaction in the curing process of the integral blank of the reinforced wall plate.
Step S130, cutting stringer prepreg according to the stringer structure laying layer of the stiffened wall panel, laying the stringer prepreg on a stringer molding core mould, and then placing the stringer prepreg on a cured skin according to a preset rib position to form an integral blank body of the stiffened wall panel;
and 140, sequentially placing a polytetrafluoroethylene isolating film and an air felt auxiliary material on the integral blank of the reinforced wall plate, packaging the combined integral blank of the reinforced wall plate by using a vacuum bag, placing the blank into an autoclave, curing according to a preset process, and reducing stress deformation in the curing process of the integral blank of the reinforced wall plate by using the lubricating effect of a lubricating prepreg. In this step, the resin viscosity of the lubricating prepreg before gelling of the stringer prepreg is less than 10Pa · s.
And 150, removing the packaging material to separate the cured reinforced wall plate from the reinforced wall plate mould.
The present invention will be described in further detail with reference to specific examples.
Example 1
The composite material stiffened wall panel part with the I-shaped stringers is a typical structure in the application of the invention, and the curing deformation of the composite material structure can be reduced by adopting the method of the invention. Fig. 1 shows a schematic external view of a composite panel with reinforcement of a drum type, which comprises a composite skin 1, and a composite stringer structure 2. Fig. 2 discloses a schematic view of a combination of a plenum stiffened composite panel and a mold, fig. 3 discloses a schematic view of a cross-section of a stringer prepreg laid on a stringer mandrel, and fig. 4 discloses a schematic view of a cross-section of a plenum stringer structure. Fig. 5 shows a cross-sectional view of a combination of an i-shaped ribbed composite wall panel and a mold. The method for controlling the curing deformation of the composite material reinforced wall plate comprises the following specific operation steps:
referring to fig. 1, 2 and 5, a skin prepreg is laid on the reinforced wall plate mould 5 and is cured and molded according to a material curing process, so that the cured composite material skin 1 is separated from the reinforced wall plate mould 5. A layer of polytetrafluoroethylene isolation film 3 with the thickness of 0.1mm is laid on a reinforced wall plate mould 5, and then 0-degree lubricating prepreg 4 is laid on the polytetrafluoroethylene isolation film 3, wherein the thickness of the lubricating prepreg 4 is 0.2 mm.
And (3) placing a layer of polytetrafluoroethylene isolating film 3 with the thickness of 0.1mm on the lubricating prepreg 4, fixing the composition of the isolating film 3-the lubricating prepreg 4-the isolating film 3 on the reinforced wall plate mould blank 5, and then placing the cured composite material skin 1 on the isolating film on the upper layer. (see FIG. 5)
And (3) paving stringer prepreg on a forming die combined by the stringer core die 6 and the stringer core die 7 according to the shape of the stringer, and respectively forming a stringer prepreg blank 8 and a stringer prepreg blank 9. And (3) combining the stringer prepreg blank 8 and the stringer prepreg blank 9 into an I-shaped stringer structure 2, and placing the combined stringer core mould 6, stringer core mould 7 and I-shaped stringer structure 2 at a preset position of the composite skin 1 to form a wallboard integral blank.
Placing polytetrafluoroethylene cloth and an air-permeable felt auxiliary material on the integral blank body, sealing by using a vacuum bag, putting into an autoclave, and curing according to a preset process.
After the solidification is finished, removing the vacuum bag, the air-permeable felt and the polytetrafluoroethylene cloth auxiliary material outside, separating the stringer core mould 6 and the stringer core mould 7, and taking down the I-shaped reinforced composite material wallboard from the reinforced wallboard mould blank 5 to finish the manufacture of the I-shaped reinforced composite material wallboard.
The composite material reinforced wallboard is not only limited to the reinforced wallboard with the I-shaped long truss structure, but also can be a reinforced wallboard with the cross section of a long truss structure such as T-shaped, L-shaped, H-shaped, C-shaped, J-shaped and K-shaped. According to the method provided by the invention, the reinforced wall board can adopt the manufacturing method provided by the invention to reduce the deformation phenomenon in the curing process.
The method can be suitable for molding composite material parts on dies with high expansion coefficients such as carbon steel, the deformation degree of the composite material parts molded by the method is not influenced by the expansion coefficient of the die materials, the conditions of large deformation and the like of the composite material parts caused by thermal expansion of the dies are avoided particularly when the composite material parts with large complex structures are molded, and the requirement on high-precision control of the curing deformation of the molded surface can be met. Meanwhile, the composite material part forming die can use more extensive and cheap die materials, so that the die cost is reduced, and the composite material part forming die is suitable for various forming process methods of composite material parts, and the process manufacturing risk is reduced.
The foregoing is merely exemplary of the present application and is not intended to be limiting thereof, and a detailed description of known process techniques is omitted herein for the sake of brevity. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (9)
1. A method of controlling curing deformation of a composite stiffened panel comprising a composite skin and a composite stringer structure, the method comprising:
step S110, paving skin prepreg on the metal reinforced wall plate mould base according to a preset paving layer, and curing and molding;
step S120, enabling the cured skin to be separated from the reinforced wall plate mould, firstly laying a layer of isolating film on the reinforced wall plate mould, then laying a lubricating prepreg on the isolating film, laying a layer of isolating film on the lubricating prepreg, fixing the isolating film-lubricating prepreg-isolating film on the reinforced wall plate mould, and placing the cured skin on the isolating film on the upper layer;
step S130, cutting stringer prepreg according to the stringer structure laying layer of the stiffened wall panel, laying the stringer prepreg on a stringer core mold to combine a stringer, and then placing the stringer and the stringer core mold on a cured skin according to a preset position to form an integral blank body of the stiffened wall panel;
and 140, packaging the combined integral blank of the stiffened wall plate by using a vacuum bag, curing according to a preset process, and reducing stress deformation of the integral blank of the stiffened wall plate in the curing process by using the lubricating effect of the lubricating prepreg.
And 150, removing the packaging material, and demolding the cured reinforced wall plate.
2. The method for controlling curing deformation of a composite material reinforced wall panel according to claim 1, wherein in step S120, the lubricating prepreg is formed by compounding unidirectional fibers and resin, and the lubricating prepreg is laid to a thickness of not more than 0.2 mm.
3. The method for controlling the curing deformation of the composite material reinforced wall plate according to claim 2, wherein the unidirectional fibers are glass fibers, carbon fibers or aramid fibers.
4. The method for controlling the curing deformation of the composite material reinforced wall plate according to claim 2, wherein the resin is epoxy resin, bismaleimide resin, polyimide resin or liquid rubber, and the weight content of the resin in the lubricating prepreg is 25-35%.
5. The method for controlling curing deformation of a composite material reinforced wall panel according to claim 1, wherein in step S120, the 0 ° laying direction of the lubricating prepreg on the release film is perpendicular to the rib stringer direction.
6. The method for controlling the curing deformation of the composite material reinforced wall plate according to claim 1, wherein in the step S120, the isolating film material is a fluorine-containing plastic film, the thickness of the isolating film material is not more than 0.1mm, the isolating film material can resist the temperature of more than 200 ℃, the isolating film material does not react with the material of the lubricating prepreg, and the isolating film is separated from the lubricating prepreg after the curing process is finished.
7. The method for controlling curing deformation of a composite material reinforced wall panel according to claim 1, wherein the viscosity of the resin in the lubricating prepreg is less than 10 Pa-S before gelation of the stringer prepreg in step S140.
8. The method for controlling curing deformation of a composite reinforced wall panel according to claim 1, wherein the cross section of the reinforced wall panel is a stringer structure having an i-shape, T-shape, L-shape, H-shape, C-shape, J-shape or K-shape in step S130.
9. The method for controlling curing deformation of a composite reinforced wall panel according to claim 1, wherein in step S140, the lubricating prepreg is not subjected to polymerization reaction during curing of the integral blank of the reinforced wall panel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010528985.0A CN111645341B (en) | 2020-06-11 | 2020-06-11 | Method for controlling curing deformation of composite material reinforced wall plate |
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| CN202010528985.0A CN111645341B (en) | 2020-06-11 | 2020-06-11 | Method for controlling curing deformation of composite material reinforced wall plate |
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| CN111645341A true CN111645341A (en) | 2020-09-11 |
| CN111645341B CN111645341B (en) | 2022-06-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112895510A (en) * | 2021-01-19 | 2021-06-04 | 西北工业大学 | Forming device and forming method for high-resin-fluidity T-shaped composite part |
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| US5288354A (en) * | 1992-08-26 | 1994-02-22 | Rexnord Corporation | Method of bonding self-lubricating fibers to an external surface of a substratum |
| DE19950621A1 (en) * | 1999-10-20 | 2001-04-26 | Schuler Kunststofftechnik Gmbh | Sliding bearing plate for molding tool parts, especially in vehicle tire molds, comprises multi-layer structure with self-lubricating bearing surface |
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