CN114559681A - Carbon fiber tubular beam forming process with variable outer diameter and thickness - Google Patents
Carbon fiber tubular beam forming process with variable outer diameter and thickness Download PDFInfo
- Publication number
- CN114559681A CN114559681A CN202210163608.0A CN202210163608A CN114559681A CN 114559681 A CN114559681 A CN 114559681A CN 202210163608 A CN202210163608 A CN 202210163608A CN 114559681 A CN114559681 A CN 114559681A
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- China
- Prior art keywords
- foam core
- tubular
- die
- tubular beam
- vacuum bag
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Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 11
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 10
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 10
- 239000006260 foam Substances 0.000 claims abstract description 34
- 230000008719 thickening Effects 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 15
- 239000011229 interlayer Substances 0.000 claims description 7
- 239000010410 layer Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012945 sealing adhesive Substances 0.000 description 1
Images
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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention relates to a carbon fiber tubular beam forming process with the same outer diameter and variable thickness, which comprises the steps of adopting a foam core mold with the same outer diameter, performing local thickening compensation on the periphery of the foam core mold in a segmented matching manner according to the requirement of the wall thickness of a tubular beam, sleeving a tubular vacuum bag film outside the foam core mold, feeding a forming mold body sleeved with a sealed outer bag into an oven for heating after mold closing, filling compressed air between the inner wall of the tubular vacuum bag film and the foam core mold through a pressurizing hole on a cover plate, and performing internal expansion pressurization with the pressure higher than 7bar so as to realize the purposes of the same outer diameter and variable wall thickness of a tubular beam finished piece.
Description
Technical Field
The invention relates to a forming process of a carbon fiber tubular beam with the same outer diameter and variable thickness.
Background
The main beam of the carbon fiber structure of the aircraft in the aviation industry conventionally adopts C-shaped and I-shaped structures, the tubular structure is just applied to the aircraft structure, the main bearing part composite material tubular beam with the constant outer diameter and the variable thickness is produced and manufactured to be applied to the aviation for the first time, and the product structure is the main bearing structure, so that the product has higher performance requirements, and the continuity of the fiber needs to be ensured while the thickness and the internal quality of the product are strictly controlled; and the outer cylindrical surface of the structure has an assembly relation, and the cylindricity and the straightness of the product after demoulding are required to be ensured.
The conventional manufacturing process of the carbon fiber tubular beam adopts autoclave molding, the process assembly adopts a mode of combining a lower concave die and a core die for molding, but in the molding process, the core die has to have stronger rigidity because the core die needs to bear larger pressure, and the core die can not be taken out from a tubular beam part with a changed inner diameter easily.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to overcome the defects in the prior art, the invention provides a carbon fiber tubular beam forming process with the same outer diameter and variable thickness.
The technical scheme adopted by the invention for solving the technical problems is as follows: a carbon fiber tubular beam forming process with variable outer diameter and thickness comprises the following steps:
s1, paving and sticking prepreg on the arc surface of the inner wall of the lower die, and flanging the excessive prepreg part on the die assembly surface of the lower die;
s2, selecting a foam core mould with equal diameter, matching the periphery of the foam core mould in sections according to the wall thickness requirement of the tubular beam to perform local thickening compensation, and then sleeving a tubular vacuum bag film outside the foam core mould;
s3, placing the foam core mould in the S2 in a lower mould, after the prepreg is turned upwards and laid, laying the prepreg turned upwards on the lower mould on the outer peripheral surface of the foam core mould, and staggering butt joints;
s4, the upper die is closed on the lower die and fixedly connected to form a forming die body;
s5, flanging the end of the tubular vacuum bag film to the end faces of the upper and lower dies, bonding and sealing by using a sealing adhesive tape, fixing a cover plate with a pressurizing hole in the center on the end faces of the upper and lower dies, sealing with the tubular vacuum bag film after the tubular vacuum bag film is sealed, and finally sleeving a sealing outer bag on a forming die body;
s6, heating the forming die body sleeved with the sealed outer bag in an oven, and filling compressed air between the inner wall of the tubular vacuum bag film and the foam core die through a pressurizing hole on the cover plate, wherein the internal expansion pressurizing is more than 7 bar; the heated foam core die shrinks, and the sealed outer bag is vacuumized at the same time, so that air between the tubular beam part and the upper and lower dies is exhausted, and the compactness of the tubular beam part is ensured.
In order to prevent the interlayer adhesion phenomenon of the laid prepreg, in step S1, when the prepreg is laid, each layer of prepreg is separated by an interlayer release film.
The invention has the beneficial effects that: according to the invention, by adopting the foam core die with the same outer diameter, on the basis of ensuring the cylindricity and the straightness of the demolded tubular beam workpiece, the local thickening compensation is performed on the periphery of the foam core die in a segmented manner, so that the tubular beam workpiece has the same outer diameter and the variable wall thickness, and the foam core die is contracted after being heated, so that the foam core die is convenient to take out from the tubular beam workpiece with the variable inner diameter.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic diagram illustrating the operation of step S1 according to the present invention.
Fig. 2 is a schematic diagram illustrating the operation of step S3 according to the present invention.
Fig. 3 is a schematic diagram illustrating the operation of step S4 according to the present invention.
Fig. 4 is a schematic diagram illustrating the operation of step S5 according to the present invention.
In the figure: 1. the production process comprises the following steps of a lower die, 2 parts of prepreg, 3 parts of interlayer isolating film, 4 parts of foam core die, 5 parts of tubular vacuum bag film, 6 parts of upper die, 7 parts of sealing rubber strip, 8 parts of pressurizing hole, 9 parts of cover plate, 10 parts of sealing outer bag and 11 parts of pipe beam finished piece.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
A carbon fiber tubular beam forming process with variable outer diameter and thickness comprises the following steps:
s1, paving the prepreg 2 on the arc surface of the inner wall of the lower die 1, and flanging the part of the excess prepreg 2 on the die joint surface of the lower die 1; in the paving process, in order to prevent the paved prepregs 2 from generating interlayer adhesion, an interlayer isolating film 3 is used for separating two adjacent layers of prepregs 2, as shown in figure 1;
s2, selecting a foam core mould 4 with the same outer diameter, performing local thickening compensation on the periphery of the foam core mould 4 in a segmented manner according to different wall thickness requirements of the manufactured tubular beam, and sleeving a tubular vacuum bag film 5 outside the foam core mould 4 after the thickening compensation is completed;
s3, placing the foam core mold 4 into the lower mold 1, after the prepreg 2 is turned upwards and laid, laying the prepreg 2 on the turned edge of the lower mold 1 on the outer peripheral surface of the foam core mold 4, and arranging the butt joints in a staggered manner, as shown in FIG. 2;
s4, closing the die, namely closing the upper die 6 on the lower die 1 and fixedly connecting the upper die and the lower die by bolts to form a forming die body, as shown in figure 3;
s5, flanging the end of the tubular vacuum bag film 5, sealing and bonding the tubular vacuum bag film 5 to the end surfaces of the upper and lower dies 6 and 1 by using a sealing rubber strip 7, after the sealing of the tubular vacuum bag film 5 is finished, fixing a cover plate 9 with a pressurizing hole 8 in the center of the end surfaces of the upper and lower dies 6 and 1, sealing and bonding the tubular vacuum bag film 5 and the cover plate 9 by using the sealing rubber strip 7, and finally sleeving a sealing outer bag 10 on a forming die body, as shown in figure 4;
s6, heating the forming die body sleeved with the sealed outer bag 10 in an oven, and filling compressed air between the inner wall of the tubular vacuum bag film 5 and the foam core die 4 through the pressurizing hole 8 on the cover plate 9, wherein the internal expansion pressurizing is more than 7 bar;
s7, shrinking the heated foam core mold 4, and forming the prepreg 2 into a tubular beam part 11 between the tubular vacuum bag film 5 and the inner wall of the forming mold body; and simultaneously, the sealed outer bag 10 is vacuumized, and air between the tubular beam product 11 and the upper and lower dies 6 and 1 is exhausted, so that the compactness of the tubular beam product 11 is ensured.
In the process, by adopting the foam core die 4 with the same outer diameter, on the basis of ensuring the cylindricity and the straightness of the tubular beam part 11 after demoulding, the local thickening compensation is performed on the periphery of the foam core die 4 in a subsection mode, so that the tubular beam part 11 is identical in outer diameter and variable in wall thickness, and the foam core die 4 is contracted after heating, so that the foam core die 4 is convenient to take out from the tubular beam part 11 with the variable inner diameter.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (2)
1. A carbon fiber tubular beam forming process with variable outer diameter and thickness is characterized in that: comprises the following steps:
s1, paving prepreg on the arc surface of the inner wall of the lower die, and flanging the excessive prepreg part on the die joint surface of the lower die;
s2, selecting a foam core mould with equal diameter, matching the periphery of the foam core mould in sections according to the wall thickness requirement of the tubular beam to perform local thickening compensation, and then sleeving a tubular vacuum bag film outside the foam core mould;
s3, placing the foam core mould in the S2 in a lower mould, after the prepreg is turned upwards and laid, laying the prepreg turned upwards on the lower mould on the outer peripheral surface of the foam core mould, and staggering butt joints;
s4, the upper die is combined on the lower die and fixedly connected to form a forming die body;
s5, flanging the end of the tubular vacuum bag film to the end faces of the upper and lower dies, bonding and sealing by using a sealing rubber strip, fixing a cover plate with a pressurizing hole in the center on the end faces of the upper and lower dies, sealing with the tubular vacuum bag film after the tubular vacuum bag film is sealed, and finally sleeving a sealing outer bag on a forming die body;
s6, heating the forming die body sleeved with the sealed outer bag in an oven, and filling compressed air between the inner wall of the tubular vacuum bag film and the foam core die through a pressurizing hole on the cover plate, wherein the internal expansion pressurizing is more than 7 bar; the heated foam core die shrinks, and the sealed outer bag is vacuumized at the same time, so that air between the tubular beam part and the upper and lower dies is exhausted, and the compactness of the tubular beam part is ensured.
2. The carbon fiber tubular beam forming process according to claim 1, wherein: in step S1, when the prepregs are laid down, each prepreg layer is separated by an interlayer isolation film to prevent interlayer adhesion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210163608.0A CN114559681A (en) | 2022-02-22 | 2022-02-22 | Carbon fiber tubular beam forming process with variable outer diameter and thickness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210163608.0A CN114559681A (en) | 2022-02-22 | 2022-02-22 | Carbon fiber tubular beam forming process with variable outer diameter and thickness |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114559681A true CN114559681A (en) | 2022-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210163608.0A Pending CN114559681A (en) | 2022-02-22 | 2022-02-22 | Carbon fiber tubular beam forming process with variable outer diameter and thickness |
Country Status (1)
| Country | Link |
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| CN (1) | CN114559681A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115302815A (en) * | 2022-10-11 | 2022-11-08 | 江苏新扬新材料股份有限公司 | Manufacturing method of special-shaped airplane frame upright post |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103935443A (en) * | 2014-04-02 | 2014-07-23 | 泰山体育产业集团有限公司 | Method for manufacturing unitized frame of carbon fiber composite bicycle |
| CN109367054A (en) * | 2018-11-07 | 2019-02-22 | 昌河飞机工业（集团）有限责任公司 | A kind of forming method of the narrow chamber shape tube beam class composite element of heavy wall |
| CN114030204A (en) * | 2021-11-08 | 2022-02-11 | 中国人民解放军国防科技大学 | Non-autoclave molding method for large-size composite material barrel |
-
2022
- 2022-02-22 CN CN202210163608.0A patent/CN114559681A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103935443A (en) * | 2014-04-02 | 2014-07-23 | 泰山体育产业集团有限公司 | Method for manufacturing unitized frame of carbon fiber composite bicycle |
| CN109367054A (en) * | 2018-11-07 | 2019-02-22 | 昌河飞机工业（集团）有限责任公司 | A kind of forming method of the narrow chamber shape tube beam class composite element of heavy wall |
| CN114030204A (en) * | 2021-11-08 | 2022-02-11 | 中国人民解放军国防科技大学 | Non-autoclave molding method for large-size composite material barrel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115302815A (en) * | 2022-10-11 | 2022-11-08 | 江苏新扬新材料股份有限公司 | Manufacturing method of special-shaped airplane frame upright post |
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