CN115195154A - Vacuum bag for high-temperature and high-pressure curing of composite material and sealing method - Google Patents
Vacuum bag for high-temperature and high-pressure curing of composite material and sealing method Download PDFInfo
- Publication number
- CN115195154A CN115195154A CN202210852678.7A CN202210852678A CN115195154A CN 115195154 A CN115195154 A CN 115195154A CN 202210852678 A CN202210852678 A CN 202210852678A CN 115195154 A CN115195154 A CN 115195154A
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- Prior art keywords
- vacuum
- rubber sleeve
- vacuum bag
- rubber
- annular groove
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- 238000007789 sealing Methods 0.000 title claims abstract description 45
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 21
- 229920001971 elastomer Polymers 0.000 claims abstract description 90
- 238000005086 pumping Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 7
- 229920001973 fluoroelastomer Polymers 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 239000004636 vulcanized rubber Substances 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010923 batch production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
-
- 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
- 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
- B29C70/544—Details of vacuum bags, e.g. materials or shape
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
The invention belongs to the technical field of composite material manufacturing process, and discloses a vacuum bag for high-temperature and high-pressure curing of a composite material and a sealing method, wherein the vacuum bag comprises the following components: the vacuum nozzle comprises a rubber sleeve, a vacuum nozzle and a sealing structure; the rubber sleeve is made of high-temperature-resistant unvulcanized rubber; the rubber sleeve is connected with a vacuum nozzle; the seal structure includes: the device comprises a rubber ring, a mould and four clamping plates; the die is a rectangular block, and four side surfaces of the rectangular block are provided with an annular groove; the rubber ring is arranged in an annular groove of the mold, a product to be cured is placed on the upper surface of the mold, and the rubber sleeve wraps the product to be cured and wraps the annular grooves around the mold; the four clamping plates are fixed through bolts and arranged around the annular groove, and are used for extruding the rubber sleeve and filling the annular groove with the rubber ring to realize sealing.
Description
Technical Field
The invention belongs to the technical field of composite material manufacturing processes, and particularly relates to a vacuum bag for high-temperature and high-pressure curing of a composite material and a sealing method.
Background
When the autoclave process is adopted for curing and forming the composite material, the vacuum bag is required to be adopted for sealing and vacuumizing the finished piece, so that pressure can be applied, the autoclave process has extremely high requirement on the sealing quality of the vacuum bag, and if vacuum leakage occurs (the vacuum degree is lower than the process requirement), the composite material finished piece cannot apply curing pressure meeting the requirement, the curing performance of the product is influenced, and even the product is scrapped.
At present, the vacuum bag technology with the curing temperature below 210 ℃ and the curing pressure below 0.35MPa is widely applied, the sealing quality stability of the vacuum bag is good, and for the vacuum bag with the curing temperature above 250 ℃, the high-temperature resistant vacuum bag has poor toughness and low adhesiveness of a sealing rubber strip, the sealing quality stability of the vacuum bag is poor, the vacuum leakage rate is high, and the curing quality and the production progress are seriously influenced.
Disclosure of Invention
The invention provides a vacuum bag for high-temperature and high-pressure curing of a composite material and a sealing method, which can solve the problem of high vacuum leakage rate during high-temperature and high-pressure curing of the composite material and ensure the vacuum degree in the curing process. Meanwhile, the vacuum bag can be used repeatedly, the requirement on sealing operation skill is not high, and the operation is convenient.
A vacuum bag for high temperature, high pressure curing of composite materials, comprising: the vacuum nozzle comprises a rubber sleeve, a vacuum nozzle and a sealing structure;
the rubber sleeve is made of high-temperature-resistant unvulcanized rubber; the rubber sleeve is connected with a vacuum nozzle;
the seal structure includes: the device comprises a rubber ring, a mould and four clamping plates;
the die is a rectangular block, and four side surfaces of the rectangular block are provided with a through annular groove; the rubber ring is arranged in an annular groove of the mold, a product to be cured is placed on the upper surface of the mold, and the rubber sleeve wraps the product to be cured and wraps the annular groove around the mold;
the four clamping plates are fixed through bolts and arranged around the annular groove, and are used for extruding the rubber sleeve and filling the annular groove with the rubber ring to realize sealing.
Further, the rubber sleeve comprises: a central bonding area and a peripheral margin area; the inner surface of the central joint area of the rubber sleeve and the outer surface of a product to be cured are conformal; the margin area around the rubber sleeve is used for being sealed and fixed with the sealing structure; the vacuum air nozzle is arranged in the margin area around the rubber sleeve.
Further, the high-temperature-resistant unvulcanized rubber is a fluororubber.
Further, the rubber ring is made of the same material as the rubber sleeve.
Furthermore, the thickness of the rubber sleeve is 0.2 mm-0.7 mm.
A method of sealing a composite material by a vacuum bag for high temperature and high pressure curing, the method being carried out by the vacuum bag, the method comprising the steps of:
the method comprises the following steps: cutting unvulcanized fluororubber matched with the size of a composite material part forming die, and vulcanizing to prepare a rubber sleeve;
step two: cleaning and drying the annular groove area of the forming die, the rubber ring and the rubber sleeve, placing the rubber ring in the annular groove of the forming die, placing a product to be cured on the forming die, and then wrapping the forming die by the rubber sleeve;
step three: placing the sealing clamping plate around the annular groove of the forming die, and fixing the sealing clamping plate through a bolt so as to form a vacuum bag in a sealing manner;
step four: connecting a vacuum nozzle on the rubber sleeve, carrying out vacuum pumping detection on the vacuum bag, entering the next step if the vacuum bag has good tightness, or adding a rubber ring or using a new rubber sleeve at the annular groove, and repeating the fourth step;
step five: sending the vacuum system into an autoclave, raising the pressure to a set pressure, and checking the sealing property of the vacuum system under the action of external pressure; after the vacuum is closed, if the vacuum degree in the vacuum bag is reduced to be not more than 0.002MPa within 10min, formal curing is carried out on the product to be cured, otherwise vulcanized rubber is added at the annular groove by opening the tank door or a new rubber mold is used until the requirements are met.
Further, in the fourth step, the vacuumizing detection step is as follows: and (3) carrying out vacuum-pumping detection on the vacuum bag for not less than 30min by using a vacuum-pumping system, wherein if the vacuum degree of the vacuum bag is not less than 0.098MPa, after the vacuum-pumping system is closed, the vacuum degree in the vacuum bag is reduced by not more than 0.002MPa within 10min, and the tightness of the vacuum bag is good.
Further, in the second step, the annular groove area of the forming die, the rubber ring and the rubber sleeve are wiped by absolute ethyl alcohol.
The invention provides a vacuum bag for high-temperature and high-pressure curing of a composite material and a sealing method, and the vacuum bag has the following advantages:
(1) The rubber material is used for replacing a conventional vacuum bag film, the rubber vacuum bag can be designed and customized according to the shape of a product, and is tightly attached to a workpiece in a vacuum-pumping state, so that the wrinkles of the conventional vacuum bag can be avoided, and meanwhile, the rubber vacuum bag has a certain rubber pressure pad function, so that the surface quality of the workpiece is improved; in addition, compared with the conventional vacuum bag, the rubber vacuum bag has thicker thickness and higher extensibility, has less internal defects of materials and is less influenced by the temperature and humidity of the environment, so that the rubber vacuum bag has safer sealing performance.
(2) The sealing mode is simple to operate, has low requirements on skills and experience of operators, is slightly influenced by human factors, is simple and convenient to use, has high vacuum bag sealing operation efficiency, and has good sealing stability of the vacuum bag scheme.
(3) This vacuum bag system can repeat repetitious usage, and for disposable conventional vacuum bag system, its airtight security is high for batch production's product can reduction in production cost, can reduce solid waste's processing simultaneously, satisfies the environmental protection requirement.
Drawings
FIG. 1 is a schematic view of a high temperature and high pressure resistant vacuum bag membrane sealing structure;
1, rubber sleeve; 2, clamping plates; 3 forming a mould; 4 annular grooves (containing rubber rings); 5 products to be sealed.
Detailed Description
A vacuum bag for high-temp and-pressure solidifying of composite material is composed of a shaping mould with ring slot and rubber ring, a rubber sleeve with vacuum nozzle, and a sealing clamp plate. Vulcanizing unvulcanized fluororubber to prepare a rubber sleeve and a rubber ring, laying a curing auxiliary material on the surface of a composite material workpiece after the composite material workpiece is molded in an effective area of a molding die, and sealing a vacuum bag after the curing auxiliary material is laid. When the vacuum bag is sealed, the rubber sleeve is placed on the surface of other auxiliary materials, the sealing clamp plate is aligned to the annular groove on the forming die, the rubber ring is clamped to realize sealing, and the schematic view of the sealing structure of the vacuum bag is shown in figure 1.
The thickness of the selected fluororubber can be adjusted within the range of 0.2 mm-0.7 mm according to the shape, size and sealing performance of a workpiece, and a rubber mold and a rubber ring with certain elasticity are prepared after vulcanization.
The sealing method comprises the following steps:
(1) Cutting unvulcanized fluororubber matched with the size of the composite material part forming die, and vulcanizing to prepare the rubber sleeve.
(2) Wiping the annular groove area of the forming die, the rubber ring and the rubber sleeve (close to one side of the composite material part) with absolute ethyl alcohol, drying, placing the rubber ring at the annular groove, and then placing the rubber die on the forming die.
(3) The placing area of the sealing splint corresponds to the annular groove on the forming die, and the sealing splint is clamped and fixed by bolts for sealing;
(4) Connecting a vacuum nozzle on the rubber mold, carrying out vacuum-pumping detection on the vacuum system with the sealing structure for no less than 30min, if the vacuum degree of the system is more than or equal to 0.098MPa, after the vacuum is closed, the vacuum degree in the vacuum bag is reduced by no more than 0.002MPa within 10min, entering the next step, or else, adding vulcanized rubber or using a new rubber mold at the annular groove until the requirements are met;
(5) And (4) conveying the vacuum system into an autoclave, raising the pressure to a set pressure, and checking the tightness of the vacuum system under the action of external pressure. And after the vacuum is closed, if the vacuum degree in the vacuum bag is reduced to be not more than 0.002MPa within 10min, formally curing the product to be cured, otherwise, opening the tank door, and adding vulcanized rubber or using a new rubber mold at the annular groove until the requirements are met.
Claims (8)
1. A vacuum bag for high-temperature and high-pressure curing of composite materials is characterized in that: the vacuum bag comprises: the vacuum nozzle comprises a rubber sleeve, a vacuum nozzle and a sealing structure;
the rubber sleeve is made of high-temperature-resistant unvulcanized rubber; the rubber sleeve is connected with a vacuum nozzle;
the seal structure includes: the device comprises a rubber ring, a mould and four clamping plates;
the die is a rectangular block, and four side surfaces of the rectangular block are provided with a through annular groove; the rubber ring is arranged in an annular groove of the mold, a product to be cured is placed on the upper surface of the mold, and the rubber sleeve wraps the product to be cured and wraps the annular groove around the mold;
the four clamping plates are fixed through bolts and arranged around the annular groove, and are used for extruding the rubber sleeve and filling the annular groove with the rubber ring to realize sealing.
2. The vacuum bag of claim 1, wherein: the rubber sleeve comprises: a central bonding area and a peripheral margin area; the inner surface of the central joint area of the rubber sleeve and the outer surface of a product to be cured are conformal; the allowance area around the rubber sleeve is used for being sealed and fixed with the sealing structure; the vacuum air nozzle is arranged in the margin area around the rubber sleeve.
3. The vacuum bag of claim 1, wherein: the high-temperature-resistant unvulcanized rubber is fluororubber.
4. The vacuum bag of claim 3, wherein: the rubber ring is made of the same material as the rubber sleeve.
5. The vacuum bag of claim 1, wherein: the thickness of the rubber sleeve is 0.2 mm-0.7 mm.
6. A vacuum bag sealing method for high temperature and high pressure curing of composite material, said method being carried out by the vacuum bag of any one of claims 1 to 5, characterized in that: the method comprises the following steps:
the method comprises the following steps: cutting unvulcanized fluororubber matched with the size of a composite material part forming die, and vulcanizing to prepare a rubber sleeve;
step two: cleaning and drying the annular groove area of the forming die, the rubber ring and the rubber sleeve, placing the rubber ring in the annular groove of the forming die, placing a product to be cured on the forming die, and then wrapping the forming die by the rubber sleeve;
step three: placing the sealing clamping plate around the annular groove of the forming die, and fixing the sealing clamping plate through a bolt so as to form a vacuum bag in a sealing manner;
step four: connecting a vacuum nozzle on the rubber sleeve, carrying out vacuum pumping detection on the vacuum bag, entering the next step if the vacuum bag has good tightness, or adding a rubber ring or using a new rubber sleeve at the annular groove, and repeating the fourth step;
step five: sending the vacuum system into an autoclave, raising the pressure to a set pressure, and checking the tightness of the vacuum system under the action of external pressure; after the vacuum is closed, if the vacuum degree in the vacuum bag is reduced to be not more than 0.002MPa within 10min, formal curing is carried out on the product to be cured, otherwise vulcanized rubber is added at the annular groove by opening the tank door or a new rubber mold is used until the requirements are met.
7. The method of claim 6, wherein: in the fourth step, the vacuumizing detection step is as follows: and (3) carrying out vacuum-pumping detection on the vacuum bag for no less than 30min by using a vacuum-pumping system, wherein if the vacuum degree of the vacuum bag is more than or equal to 0.098MPa, and after the vacuum-pumping system is closed, the vacuum degree in the vacuum bag is reduced by no more than 0.002MPa within 10min, the tightness of the vacuum bag is good.
8. The method of claim 6, wherein: in the second step, the annular groove area of the forming die, the rubber ring and the rubber sleeve are wiped by absolute ethyl alcohol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210852678.7A CN115195154B (en) | 2022-07-20 | 2022-07-20 | Vacuum bag for high-temperature high-pressure curing of composite material and sealing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210852678.7A CN115195154B (en) | 2022-07-20 | 2022-07-20 | Vacuum bag for high-temperature high-pressure curing of composite material and sealing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115195154A true CN115195154A (en) | 2022-10-18 |
| CN115195154B CN115195154B (en) | 2024-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210852678.7A Active CN115195154B (en) | 2022-07-20 | 2022-07-20 | Vacuum bag for high-temperature high-pressure curing of composite material and sealing method |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2168578T3 (en) * | 1996-05-07 | 2002-06-16 | Gore & Ass | CABLE COVERS AND INTEGRAL COMPOSITE TUBES REINFORCED WITH IMPROVED FLUOROPOLIMERO FIBERS. |
| US20040115299A1 (en) * | 2002-12-11 | 2004-06-17 | John Potter | Seal-less reusable vacuum bag |
| JP2005047262A (en) * | 2003-07-11 | 2005-02-24 | Kokoku Intech Co Ltd | Manufacturing method of rubber member having embedded base material, and rubber member having embedded base material |
| US20150137430A1 (en) * | 2012-10-31 | 2015-05-21 | The Boeing Company | Over-molded vacuum barrier and inner mold line bag carrier with soluble details in trapped closed mold tooling |
| CN105729827A (en) * | 2016-02-25 | 2016-07-06 | 成都飞机工业（集团）有限责任公司 | Mechanical pressurizing method and device for composite material cured by microwave |
| CN206154707U (en) * | 2016-11-16 | 2017-05-10 | 重庆优优新材料有限公司 | New material apparatus for producing based on vacuum technique design |
| US20190039335A1 (en) * | 2017-08-04 | 2019-02-07 | Industrial Technologies Inc. | Reusable vacuum bag process |
| CN213564479U (en) * | 2020-09-01 | 2021-06-29 | 科泰思(中国)复合材料有限责任公司 | Vacuum bag making tool |
-
2022
- 2022-07-20 CN CN202210852678.7A patent/CN115195154B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2168578T3 (en) * | 1996-05-07 | 2002-06-16 | Gore & Ass | CABLE COVERS AND INTEGRAL COMPOSITE TUBES REINFORCED WITH IMPROVED FLUOROPOLIMERO FIBERS. |
| US20040115299A1 (en) * | 2002-12-11 | 2004-06-17 | John Potter | Seal-less reusable vacuum bag |
| JP2005047262A (en) * | 2003-07-11 | 2005-02-24 | Kokoku Intech Co Ltd | Manufacturing method of rubber member having embedded base material, and rubber member having embedded base material |
| US20150137430A1 (en) * | 2012-10-31 | 2015-05-21 | The Boeing Company | Over-molded vacuum barrier and inner mold line bag carrier with soluble details in trapped closed mold tooling |
| CN105729827A (en) * | 2016-02-25 | 2016-07-06 | 成都飞机工业（集团）有限责任公司 | Mechanical pressurizing method and device for composite material cured by microwave |
| CN206154707U (en) * | 2016-11-16 | 2017-05-10 | 重庆优优新材料有限公司 | New material apparatus for producing based on vacuum technique design |
| US20190039335A1 (en) * | 2017-08-04 | 2019-02-07 | Industrial Technologies Inc. | Reusable vacuum bag process |
| CN213564479U (en) * | 2020-09-01 | 2021-06-29 | 科泰思(中国)复合材料有限责任公司 | Vacuum bag making tool |
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| CN115195154B (en) | 2024-05-24 |
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