CN107097434B - Large-thickness carbon fiber U-shaped beam VARI forming process - Google Patents
Large-thickness carbon fiber U-shaped beam VARI forming process Download PDFInfo
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- CN107097434B CN107097434B CN201710318765.3A CN201710318765A CN107097434B CN 107097434 B CN107097434 B CN 107097434B CN 201710318765 A CN201710318765 A CN 201710318765A CN 107097434 B CN107097434 B CN 107097434B
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- carbon fiber
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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
- 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
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
- B29C70/443—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding and impregnating by vacuum or injection
-
- 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
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
- B29C70/446—Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames
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- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention provides a VARI (vacuum forming of large-thickness carbon fiber) forming process for a U-shaped beam of a large-thickness carbon fiber, which is characterized in that a VARI glue injection pipeline is changed, a glue injection pipeline is arranged at the edge of one edge strip of one side of the VARI glue injection pipeline, an air suction pipeline is arranged on the edge strip of the other side of the VARI glue injection pipeline, so that resin reaches the edge strip of the other side of the VARI glue injection pipeline from the edge strip of one side through a web, the resin is enabled to be pushed forwards in parallel along one direction in the process of infiltrating the U-shaped beam of the large-thickness carbon fiber, the defects that dry yarns, pinholes and the like are generated in the web area of the U-shaped beam of the large-thickness carbon fiber due to the fact that the resin forms a quick channel.
Description
Technical Field
The invention relates to a carbon fiber forming process, in particular to a carbon fiber VARI forming process.
Background
The composite material is more and more widely applied in various fields of aviation, aerospace, rail transit and the like, along with the increasing application requirements, the composite material cost is more and more satisfied, and the autoclave process is gradually replaced in certain special structural forms by adopting low-cost liquid forming processes such as VARI and the like, so that the process becomes a mainstream process. The large-thickness carbon fiber U-shaped beam is used as a typical composite material structural part, has wide application and is often used as a main bearing part, the large-thickness carbon fiber U-shaped beam is conventionally formed by using an autoclave, the large-thickness carbon fiber U-shaped beam is formed by using a VARI (vacuum variation induced plasticity) carbon fiber VARI process as a novel low-cost composite material forming process, and a plurality of problems need to be solved in the application process.
The carbon fiber U-shaped beam adopting the VARI forming process is conventionally characterized in that a flow guide medium is arranged in a web plate area and a marginal strip area of the U-shaped beam, the flow guide medium is respectively 5cm away from the edge of the web plate and the edge of the marginal strip, an adhesive injection pipeline is arranged in the middle of the web plate of the U-shaped beam, and an air exhaust pipeline is arranged on the marginal strips at two sides, namely the VARI adhesive injection process is completed in a mode of injecting adhesive from the middle and exhausting air from two sides.
The VARI forming guide pipeline and the air exhaust mode form a large-thickness carbon fiber U-shaped beam, and resin infiltrates carbon fibers on the top of the web plate along the X direction of a guide medium; meanwhile, the resin infiltrates the carbon fibers in the thickness direction along the Z direction, but the flow speed of the resin along the X direction is far greater than that along the Z direction, when the resin rapidly flows to the R positions on two sides of the U-shaped carbon fiber beam along the X direction, because the compactness of the carbon fibers at the R position is lower than that of the carbon fibers at the web and the edge strip, the resin reaches the R position to form a rapid channel, and the speed of the resin at the Z position at the R position is far greater than that of the resin in the Z direction at the web area, so that after the resin infiltrates the carbon fibers at the bottom surface of the R position, the resin infiltrates back along the carbon fibers at the bottommost surface of the web, a resin surrounding area is formed at the bottom surface of the web area, and finally, serious defects such as yarn drying and pinholes on the bottom surface of the U-shaped carbon fiber beam are generated.
The existing problems are considered in the process of forming the large-thickness carbon fiber U-shaped beam by the VARI, and need to be solved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a VARI (vacuum forming of large-thickness carbon fiber) forming process for a U-shaped beam.
A VARI forming process for a large-thickness carbon fiber U-shaped beam comprises a U-shaped beam mold, wherein sealing rubber strips are adhered to the periphery of the U-shaped beam mold; paving a prefabricated fabric of a large-thickness carbon fiber U-shaped beam on the inner surface of a U-shaped beam mold, sequentially paving demoulding cloth, a flow guide medium, an injection pipeline and an air suction pipeline after paving, then sticking the vacuum bag film on a sealing adhesive tape, extracting vacuum, detecting the vacuum degree, injecting resin when the vacuum degree reaches over 980mbar, heating and curing, and (3) obtaining a large-thickness carbon fiber U-shaped beam product, wherein the diversion medium is broken at the corners R of two sides of the large-thickness carbon fiber U-shaped beam to form three parts, namely a left diversion medium, a lower diversion medium and a right diversion medium, the left diversion medium and the right diversion medium are respectively arranged on the edge strips of the left side and the right side, the lower diversion medium is arranged on the web plate at the bottom, the breaking distance between the left diversion medium and the lower diversion medium is 1 cm-3 cm, and the breaking distance between the lower diversion medium and the right diversion medium is 1 cm-3 cm.
The glue injection pipeline is arranged on a flange strip on one side of the large-thickness carbon fiber U-shaped beam, the glue injection pipeline is directly connected with the left diversion medium, and the air exhaust pipeline is arranged on a flange strip on the other side of the carbon fiber U-shaped beam.
The glue injection pipeline consists of a left flow guide medium and a winding pipe, the winding pipe is wrapped by the left flow guide medium, and the winding pipe is fixed in the left flow guide medium in a sewing mode.
The left flow guide medium consists of two layers of flow guide nets.
The demoulding cloth is composed of a left demoulding cloth, a lower demoulding cloth and a right demoulding cloth, and the left demoulding cloth, the lower demoulding cloth and the lower demoulding cloth are in lap joint.
The distance L1 between the left guide medium, the lower guide medium and the right guide medium and the edge of the carbon fiber U-shaped beam is 5-10 cm.
The air exhaust pipeline consists of a VAP film, a winding pipe and a pipeline, wherein a sealing rubber strip is firstly adhered to the edge of the VAP film, the winding pipe and the pipeline are fixed and placed in the middle of the VAP film, and the winding pipe and the pipeline are wrapped inside the VAP film through the sealing rubber strip.
According to the VARI forming process for the large-thickness carbon fiber U-shaped beam, the design of a VARI glue injection pipeline is changed, the glue injection pipeline is arranged at the edge of the edge strip on one side, the air suction pipeline is arranged on the edge strip on the other side, so that resin reaches the edge strip on the other side from the edge strip on one side through the web, the resin is enabled to be pushed forwards in parallel along one direction in the process of infiltrating the large-thickness carbon fiber U-shaped beam, the defects that dry yarns, pinholes and the like are generated in the web area of the large-thickness carbon fiber U-shaped beam due to the fact that the resin forms a quick channel in the large-thickness carbon fiber U-shaped beam and forms a wrapping path are avoided, the problem that the large-thickness carbon fiber U-shaped beam is difficult to form in the.
Drawings
Fig. 1 is an overall schematic view of the present invention.
FIG. 2 is a schematic view showing a positional relationship between a current-guiding net and a carbon fiber U-shaped beam member according to the present invention.
FIG. 3 is a schematic view of the suction line of the present invention.
Fig. 4 is a schematic diagram of the manufacturing process of the extraction line of the present invention.
Detailed Description
The invention is illustrated by the following specific examples.
As shown in fig. 1, a sealing rubber strip 1 is adhered to the edges of two sides of a mold 5, a preformed body of a carbon fiber U-shaped beam 3 product is paved on the surface of the mold 5, 8-10 layers are paved each time, vacuum precompression is extracted once, after the preformed body of the carbon fiber U-shaped beam 3 is paved, a left demolding cloth 2, a lower demolding cloth 6 and a right demolding cloth 7 are paved, wherein the left demolding cloth 2 and the lower demolding cloth 6 are disconnected, the lower demolding cloth 6 and the right demolding cloth 7 are formed in an overlapped mode, the right demolding cloth 7 comprises an air suction pipeline 9, then a diversion medium is paved, wherein the left diversion medium 4 comprises 2 layers of diversion nets and comprises an adhesive injection pipeline 11, the left diversion medium and the right diversion medium are arranged on one edge strip together, the lower diversion medium 8 is arranged in the web area of the carbon fiber U-shaped beam 3, the lower diversion medium 8 is disconnected with the left diversion medium 4, the disconnection distance is 2-3 cm, and the right diversion medium 10 is arranged on the edge strip on, the distance between the lower guide medium 8 and the right guide medium 10 is 1 cm-3 cm. And finally, sealing the vacuum bag film 12 on the sealing rubber strip 1, extracting vacuum, detecting the vacuum, injecting resin when the vacuum reaches more than 950mbar, and heating and curing to obtain the large-thickness carbon fiber U-shaped beam product.
As shown in fig. 2, the distance L1 between the left guide medium 4, the lower guide medium 8 and the right guide medium 10 and the edge of the carbon fiber U-shaped beam is 5-10 cm, so that the resin is fully ensured to infiltrate the fibers of the whole carbon fiber U-shaped beam part by virtue of the permeation of the resin.
The suction line 9 is composed of a VAP membrane 13, a wrapping tube 14, and a line 15. Firstly, sealing rubber strips 1 are bonded on two sides of a VAP film 13, a winding pipe 14 is placed in the middle of the VAP film 13, the VAP film 13 is sealed, the winding pipe 14 is tightly wrapped in the VAP film 13, the pipe 15 is connected with the winding pipe 14 at the outlet, the sealing rubber strips are used for sealing, the pipe 15 is connected to a vacuum system, namely, the vacuum system can be vacuumized, the vacuum degree is detected, and resin is ready to be injected.
Claims (6)
1. A VARI forming process for a large-thickness carbon fiber U-shaped beam is characterized by comprising a U-shaped beam mold (5), wherein sealing rubber strips (1) are adhered to the periphery of the U-shaped beam mold (5); paving and pasting prefabricated fabric of a large-thickness carbon fiber U-shaped beam (3) on the inner surface of a U-shaped beam mold (5), paving and covering demolding cloth, guiding media, arranging an adhesive injection pipeline (11) and an air extraction pipeline (9), then pasting a vacuum bag film (12) on a sealing adhesive tape (1), extracting vacuum, detecting the vacuum degree, injecting resin when the vacuum degree reaches over 980mbar, heating and curing to obtain a large-thickness carbon fiber U-shaped beam product, wherein the guiding media are broken at 'R' corners on two sides of the large-thickness carbon fiber U-shaped beam to form three parts, namely a left guiding medium (4), a lower guiding medium (8) and a right guiding medium (10), the left guiding medium (4) and the right guiding medium (10) are respectively arranged on edge strips on the left side and the right side, the lower guiding medium (8) is arranged on a web plate at the bottom, and the breaking distance between the left guiding medium (4) and the lower guiding medium (8) is 1 cm-3 cm, the disconnection distance between the lower guide medium (8) and the right guide medium (10) is 1 cm-3 cm; the glue injection pipeline (11) is arranged on a flange strip on one side of the large-thickness carbon fiber U-shaped beam (3), the glue injection pipeline (11) is directly connected with the left flow guide medium (4), and the air suction pipeline (9) is arranged on a flange strip on the other side of the carbon fiber U-shaped beam (3).
2. The VARI forming process for large-thickness carbon fiber U-shaped beams according to claim 1, wherein the glue injection pipeline (11) is composed of a left flow guide medium (4) and a winding pipe (14), the winding pipe (14) is wrapped by the left flow guide medium (4), and the winding pipe (14) is fixed in the left flow guide medium (4) in a sewing mode.
3. The VARI forming process for large-thickness carbon fiber U-shaped beam according to claim 1, wherein the left flow guide medium (4) is composed of two layers of flow guide nets.
4. The VARI forming process for large-thickness carbon fiber U-shaped beam according to claim 1, wherein the release cloth is composed of a left release cloth (2), a lower release cloth (6) and a right release cloth (7), and the left release cloth (2), the lower release cloth (6) and the right release cloth (7) are overlapped.
5. The VARI forming process for the large-thickness carbon fiber U-shaped beam according to claim 1, wherein the distance L1 between the left flow guide medium (4), the lower flow guide medium (8) and the right flow guide medium (10) and the edge of the carbon fiber U-shaped beam is 5-10 cm.
6. The VARI forming process for the large-thickness carbon fiber U-shaped beam according to claim 1, wherein the air exhaust pipeline (9) is composed of a VAP film (13), a winding pipe (14) and a pipeline (15), a sealing rubber strip (1) is firstly adhered to the edge of the VAP film (13), the winding pipe (14) and the pipeline (15) are fixed and placed in the middle of the VAP film (13), and the winding pipe (14) and the pipeline (15) are wrapped inside the VAP film (13) through the sealing rubber strip (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710318765.3A CN107097434B (en) | 2017-05-08 | 2017-05-08 | Large-thickness carbon fiber U-shaped beam VARI forming process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710318765.3A CN107097434B (en) | 2017-05-08 | 2017-05-08 | Large-thickness carbon fiber U-shaped beam VARI forming process |
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| Publication Number | Publication Date |
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| CN107097434A CN107097434A (en) | 2017-08-29 |
| CN107097434B true CN107097434B (en) | 2020-04-03 |
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| CN201710318765.3A Active CN107097434B (en) | 2017-05-08 | 2017-05-08 | Large-thickness carbon fiber U-shaped beam VARI forming process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112123812A (en) * | 2020-08-05 | 2020-12-25 | 上海复合材料科技有限公司 | Large-size light composite material barrel with flange and integrated forming method thereof |
| CN114274550B (en) * | 2021-12-14 | 2024-07-12 | 洛阳双瑞橡塑科技有限公司 | Polyhedron forming die and process based on VARI forming process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106564202A (en) * | 2016-09-23 | 2017-04-19 | 中航复合材料有限责任公司 | Method for preparing hybrid composite U-shaped piece through vacuum leading-in forming |
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- 2017-05-08 CN CN201710318765.3A patent/CN107097434B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106564202A (en) * | 2016-09-23 | 2017-04-19 | 中航复合材料有限责任公司 | Method for preparing hybrid composite U-shaped piece through vacuum leading-in forming |
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