CN115195155A - High-temperature-resistant high-pressure-resistant vacuum bag film sealing structure and method - Google Patents
High-temperature-resistant high-pressure-resistant vacuum bag film sealing structure and method Download PDFInfo
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- CN115195155A CN115195155A CN202210855872.0A CN202210855872A CN115195155A CN 115195155 A CN115195155 A CN 115195155A CN 202210855872 A CN202210855872 A CN 202210855872A CN 115195155 A CN115195155 A CN 115195155A
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- sealing rubber
- vacuum
- rubber strip
- annular sealing
- vacuum bag
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- 238000007789 sealing Methods 0.000 title claims abstract description 127
- 238000000034 method Methods 0.000 title claims description 23
- 229920001971 elastomer Polymers 0.000 claims abstract description 111
- 239000005060 rubber Substances 0.000 claims abstract description 111
- 238000001514 detection method Methods 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 7
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 5
- 239000002356 single layer Substances 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 229920003051 synthetic elastomer Polymers 0.000 abstract description 2
- 239000005061 synthetic rubber Substances 0.000 abstract description 2
- 229920001296 polysiloxane Polymers 0.000 abstract 1
- 239000012945 sealing adhesive Substances 0.000 description 7
- 238000000465 moulding Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- 239000002390 adhesive tape Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 230000005855 radiation 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
Abstract
The invention belongs to the technical field of composite material manufacturing processes, and discloses a high-temperature and high-pressure resistant vacuum bag film sealing structure, which comprises: a mould, a product to be sealed and a vacuum bag film; the product to be sealed is arranged between the mould and the vacuum bag film; a first annular sealing rubber strip, a second annular sealing rubber strip and a third annular sealing rubber strip are sequentially arranged between the mold and the vacuum bag film on the outer side of the product to be sealed; the first annular sealing rubber strip and the second annular sealing rubber strip are silicone high-temperature rubber strips, and the third annular sealing rubber strip is a synthetic rubber normal-temperature rubber strip.
Description
Technical Field
The invention belongs to the technical field of composite material manufacturing processes, and particularly relates to a high-temperature and high-pressure resistant vacuum bag film sealing structure and a method.
Background
The composite material has the advantages of high specific strength, excellent fatigue resistance electromagnetic property, strong designability and the like, and is widely applied to airplane structures. Because the radiation heat of the parts such as the aircraft engine is high, the structure close to the parts such as the aircraft engine is required to have excellent high temperature resistance, the temperature resistance of the composite material is often required to be over 250 ℃, and the improvement of the temperature resistance provides a new challenge for the forming process of the composite material.
An autoclave molding process, which is a widely used molding method in the aerospace field, is a molding process in which a composite material blank or a cementing structure is sealed on a tool by a vacuum bag, the tool and a component are placed in an autoclave together, and the composite material blank or the cementing structure is cured under high pressure. Once the vacuum sealing is defective under the conditions of high temperature and high pressure, the vacuum degree does not meet the requirement, so that the porosity of the composite material is increased, and the performance of the composite material is influenced.
At present, when the autoclave molding process is cured at the temperature of below 200 ℃, a nylon vacuum bag film is sealed by a common synthetic rubber sealing rubber strip, the vacuum in the curing process basically meets the requirements, and the process is relatively stable. However, when the curing temperature reaches above 250 ℃, common sealing rubber strips and vacuum bag films are easy to age and lose efficacy, so that vacuum leakage is caused, and high-temperature resistant vacuum bag films and sealing rubber strips are used. However, high temperature resistant vacuum bag membranes such as POLYIMIDE manufactured by Airtech corporation tend to be brittle at normal temperature or at lower curing temperature, and the vacuum bag membranes are prone to brittle fracture under the action of vacuum and external pressure; the high-temperature resistant sealing rubber strip such as A-800-3G has weaker bonding property when the curing temperature is lower, and often has vacuum leakage when the temperature is not higher than 250 ℃. Therefore, when the autoclave molding process is adopted for curing at the temperature of more than 250 ℃, the problem of product scrapping caused by the inconformity of vacuum degree often occurs.
Disclosure of Invention
The invention provides a high-temperature and high-pressure resistant vacuum bag film sealing structure and a method, which solve the problem of high vacuum leakage under the high-temperature and high-pressure condition when a composite material autoclave is formed.
A high temperature and high pressure resistant vacuum bag film sealing structure, comprising: a mould, a product to be sealed and a vacuum bag film;
the product to be sealed is paved on a mould and sealed by a vacuum bag film after being molded;
a first annular sealing rubber strip, a second annular sealing rubber strip and a third annular sealing rubber strip are sequentially arranged between the mold and the vacuum bag film on the outer side of the product to be sealed;
the first annular sealing rubber strip and the second annular sealing rubber strip are high-temperature curing sealing rubber strips, and the third annular sealing rubber strip is a common curing sealing rubber strip.
Furthermore, the distance between the first annular sealing rubber strip, the second annular sealing rubber strip and the third annular sealing rubber strip is 8-15 mm.
Furthermore, the widths of the first, second and third annular sealing rubber strips are 8-20 mm.
Further, the vacuum bag film is adhered to the mold through a single layer of pressure sensitive adhesive tape at the edges of the vacuum bag film.
A method of high temperature and pressure resistant vacuum bag film sealing for forming said sealing structure, said method comprising the steps of:
the method comprises the following steps: placing a product to be sealed on a mold, and sequentially bonding a first annular sealing rubber strip, a second annular sealing rubber strip and a third annular sealing rubber strip on the outer side of the product to be sealed;
step two: tearing off release paper of the first annular sealing rubber strip, placing a vacuum bag film on a mold, pressing the first annular sealing rubber strip and the vacuum bag to enable the first annular sealing rubber strip and the vacuum bag film to be tightly attached, and discharging air bubbles in the first annular sealing rubber strip;
step three: carrying out T-duration vacuum-pumping detection on a vacuum system formed by the first annular sealing rubber strip, the vacuum bag film and the mold, if the vacuum value of the vacuum system is greater than a threshold value and is kept stable, entering the next step, and if not, plugging or re-bonding the vacuum bag film at the air leakage part by using the sealing rubber strip until the vacuum value of the vacuum system is greater than the threshold value;
step four: tearing off release paper of the second annular sealing adhesive tape, and pressing a corresponding vacuum bag at the position of the second annular sealing adhesive tape to enable the second annular sealing adhesive tape to adhere to the vacuum bag film tightly;
step five: carrying out T-duration vacuum-pumping detection on a vacuum system formed by the first annular sealing rubber strip, the second annular sealing rubber strip, the vacuum bag film and the mold, if the vacuum value of the vacuum system is greater than a threshold value and is kept stable, entering the next step, and otherwise, plugging the air leakage part by using the sealing rubber strip until the vacuum value of the vacuum system is greater than the threshold value;
step six: tearing off release paper of the third annular sealing rubber strip, and pressing a corresponding vacuum bag at the position of the third annular sealing rubber strip to enable the third annular sealing rubber strip to adhere to the vacuum bag film tightly;
step seven: carrying out T-duration vacuum-pumping detection on a vacuum system formed by the first, second and third annular sealing rubber strips, the vacuum bag film and the mold, if the vacuum value of the vacuum system is greater than a threshold value and is kept stable, entering the next step, and if not, plugging the air leakage part by using the sealing rubber strips until the vacuum value of the vacuum system is greater than the threshold value;
step eight: and (3) after the single-layer pressure-sensitive adhesive tape is adhered to the edge of the vacuum bag film, conveying the vacuum system into an autoclave, and raising the autoclave to a set pressure to check the vacuum degree.
Further, the threshold value of the vacuum value is 0.098MPa, and the stability is maintained, namely the absolute value of the vacuum degree is reduced by not more than 0.002MPa within 10min after the vacuum system is closed.
Further, T is not less than 30min.
Further, in the eighth step, the autoclave pressure rise speed is 40KPa/min.
Has the advantages that: the invention provides a high-temperature and high-pressure resistant vacuum bag film sealing structure and a method, which can reduce the vacuum leakage rate of products cured under the conditions of high temperature and high pressure. The protection points are in a vacuum bag sealing mode and a leakage detection mode.
Drawings
FIG. 1 is a schematic view of a high temperature and high pressure resistant vacuum bag membrane sealing structure;
1-high temperature resistant vacuum bag film; 2-common sealing rubber strips for curing; 3-high temperature resistant sealing rubber strips; 4-a mould; 5-product to be sealed.
Detailed Description
A vacuum bag sealing structure:
and after the product is formed, laying a curing auxiliary material on the surface of the product, and after the auxiliary material is laid, sealing the vacuum bag. When the vacuum bag is sealed, 3 layers of sealing rubber strips are adopted, namely each layer of sealing rubber strip forms a loop (as shown in figure 1), and the distance between two adjacent layers of rubber strips is 5-10 mm. Aiming at the temperature requirement of the high-temperature resistant product during curing, 2 circles of adhesive tapes close to the product adopt high-temperature curing sealing adhesive tapes, and the outermost layer of adhesive tape is a common sealing adhesive tape for curing. When the curing temperature is below 200 ℃, the bonding performance of the common curing sealing rubber strip is good, the stability of a vacuum system can be kept, when the curing temperature reaches above 200 ℃, the common curing sealing rubber strip is aged, the bonding capability is weakened, but at the moment, the bonding capability of the high-temperature curing sealing rubber strip is strengthened, and the sealing effect is realized. The joint action of the high-temperature sealing rubber strip and the low-temperature sealing rubber strip ensures the sealing property of the composite material during high-temperature curing.
The sealing method comprises the following steps:
(1) Polishing the bonding area of the sealing adhesive tape on the surface of the die by using abrasive paper, and cleaning the bonding surface;
(2) Sequentially bonding a first ring of sealing rubber strips, a second ring of sealing rubber strips and a third ring of sealing rubber strips in a bonding area of the sealing rubber strips on the surface of the die, wherein the distance between the first ring of sealing rubber strips, the distance between the second ring of sealing rubber strips and the third ring of sealing rubber strips is 8-15 mm, and the width of the first ring of sealing rubber strips, the width of the second ring of sealing rubber strips and the width of the third ring of sealing rubber strips is 8-20 mm;
(3) Tearing off the release paper of the first annular sealing rubber strip, placing the vacuum bag film on the mold, pressing the first annular sealing rubber strip and the vacuum bag film to enable the first annular sealing rubber strip and the vacuum bag film to be tightly attached, and removing air bubbles in the sealing rubber strip.
(4) Carrying out vacuumizing detection on a vacuum system formed by the first annular sealing rubber strip, a vacuum bag film and a mould 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 to be no more than 0.002MPa within 10min, entering the next step, otherwise, plugging the air leakage part by using the sealing rubber strip or re-making the bag until the requirements are met;
(5) Tearing off release paper of the second annular sealing rubber strip, pressing a corresponding vacuum bag at the position of the second annular sealing rubber strip, and removing air bubbles in the sealing rubber strip to enable the second annular sealing rubber strip to be tightly adhered to the vacuum bag film;
(6) Vacuumizing a vacuum system formed by the first annular sealing rubber strip, the second annular sealing rubber strip, the vacuum bag film and the mold 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 to be no more than 0.002MPa within 10min, entering the next step, otherwise, plugging the air leakage part by using the sealing rubber strip until the requirements are met;
(7) Tearing off release paper of the third annular sealing rubber strip, pressing a vacuum bag corresponding to the position of the third annular sealing rubber strip, and removing air bubbles in the sealing rubber strip to enable the third annular sealing rubber strip to adhere to the vacuum bag film;
(8) Carrying out vacuum-pumping detection on a vacuum system formed by the first, second and third annular sealing rubber strips, the vacuum bag film and the mould 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, otherwise, plugging the air leakage part by using the sealing rubber strips until the requirements are met;
(9) And finally, conveying the vacuum system into an autoclave, increasing the pressure of the autoclave to a set pressure at the speed of 40KPa/min, and checking the vacuum degree in the bag 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, entering the next step, otherwise, plugging the air leakage part by using a sealing rubber strip until the requirements are met;
a single-layer pressure-sensitive adhesive tape is bonded on the edge of the vacuum bag film, so that the vacuum bag film is prevented from being blown by air flow when being cured in the hot-pressing tank, and the sealing adhesive tape is prevented from being failed.
Claims (8)
1. The utility model provides a high temperature resistant high pressure vacuum bag membrane seal structure which characterized in that: the structure includes: a mould, a product to be sealed and a vacuum bag film;
the product to be sealed is paved on a mould and sealed by a vacuum bag film after being molded;
a first annular sealing rubber strip, a second annular sealing rubber strip and a third annular sealing rubber strip are sequentially arranged between the mold and the vacuum bag film on the outer side of the product to be sealed;
the first annular sealing rubber strip and the second annular sealing rubber strip are high-temperature curing sealing rubber strips, and the third annular sealing rubber strip is a common curing sealing rubber strip.
2. The apparatus of claim 1, wherein: the distance between the first, second and third annular sealing rubber strips is 8-15 mm.
3. The apparatus of claim 1, wherein: the widths of the first, second and third annular sealing rubber strips are 8-20 mm.
4. The apparatus of claim 1, wherein: the vacuum bag film is adhered to the mold at the edges of the vacuum bag film by a single layer of pressure sensitive adhesive tape.
5. A method of high temperature and pressure resistant vacuum bag film sealing for forming a sealing structure according to any of claims 1-4, characterized by: the method comprises the following steps:
the method comprises the following steps: placing a product to be sealed on a mold, and sequentially bonding a first annular sealing rubber strip, a second annular sealing rubber strip and a third annular sealing rubber strip on the outer side of the product to be sealed;
step two: tearing off release paper of the first annular sealing rubber strip, placing a vacuum bag film on a mold, pressing the first annular sealing rubber strip and the vacuum bag to enable the first annular sealing rubber strip and the vacuum bag film to be tightly attached, and discharging air bubbles in the first annular sealing rubber strip;
step three: carrying out T-duration vacuum-pumping detection on a vacuum system formed by the first annular sealing rubber strip, the vacuum bag film and the mold, if the vacuum value of the vacuum system is greater than a threshold value and is kept stable, entering the next step, and if not, plugging or re-bonding the vacuum bag film at the air leakage part by using the sealing rubber strip until the vacuum value of the vacuum system is greater than the threshold value;
step four: tearing off release paper of the second annular sealing rubber strip, and pressing the corresponding vacuum bag at the position of the second annular sealing rubber strip to enable the second annular sealing rubber strip to be tightly adhered to the vacuum bag film;
step five: carrying out T-duration vacuum-pumping detection on a vacuum system formed by the first annular sealing rubber strip, the second annular sealing rubber strip, the vacuum bag film and the mold, if the vacuum value of the vacuum system is greater than a threshold value and is kept stable, entering the next step, and otherwise, plugging the air leakage part by using the sealing rubber strip until the vacuum value of the vacuum system is greater than the threshold value;
step six: tearing off release paper of the third annular sealing rubber strip, and pressing a corresponding vacuum bag at the position of the third annular sealing rubber strip to enable the third annular sealing rubber strip to be tightly adhered to a vacuum bag film;
step seven: carrying out T-duration vacuum-pumping detection on a vacuum system formed by the first, second and third annular sealing rubber strips, the vacuum bag film and the mold, if the vacuum value of the vacuum system is greater than a threshold value and is kept stable, entering the next step, and if not, plugging the air leakage part by using the sealing rubber strips until the vacuum value of the vacuum system is greater than the threshold value;
step eight: and (3) after the single-layer pressure-sensitive adhesive tape is bonded at the edge of the vacuum bag film, conveying the vacuum system into an autoclave, and raising the autoclave to a set pressure to check the vacuum degree.
6. The method of claim 5, wherein: the vacuum value threshold is 0.098MPa, and the stability is maintained, namely the absolute value of the vacuum degree is reduced to be not more than 0.002MPa within 10min after the vacuum system is closed.
7. The method of claim 5, wherein: t is not less than 30min.
8. The method of claim 5, wherein: in the step eight, the pressure raising speed of the autoclave is 40KPa/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210855872.0A CN115195155A (en) | 2022-07-20 | 2022-07-20 | High-temperature-resistant high-pressure-resistant vacuum bag film sealing structure and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210855872.0A CN115195155A (en) | 2022-07-20 | 2022-07-20 | High-temperature-resistant high-pressure-resistant vacuum bag film sealing structure and method |
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| CN115195155A true CN115195155A (en) | 2022-10-18 |
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| CN202210855872.0A Pending CN115195155A (en) | 2022-07-20 | 2022-07-20 | High-temperature-resistant high-pressure-resistant vacuum bag film sealing structure and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116001311A (en) * | 2022-12-26 | 2023-04-25 | 江西洪都航空工业集团有限责任公司 | Method for rapidly tearing off resin film release paper of bismaleimide system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102350803A (en) * | 2011-06-24 | 2012-02-15 | 中国航空工业集团公司北京航空制造工程研究所 | Encapsulation method for reducing vacuum leakage in composite material formation |
| CN206344479U (en) * | 2017-01-03 | 2017-07-21 | 四川东树新材料有限公司 | A kind of preparation facilities of vacuum assisted resin infusion composite laminated plate |
| CN112026201A (en) * | 2020-07-27 | 2020-12-04 | 国营芜湖机械厂 | Method for rapidly repairing metal crack damage by composite material |
-
2022
- 2022-07-20 CN CN202210855872.0A patent/CN115195155A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102350803A (en) * | 2011-06-24 | 2012-02-15 | 中国航空工业集团公司北京航空制造工程研究所 | Encapsulation method for reducing vacuum leakage in composite material formation |
| CN206344479U (en) * | 2017-01-03 | 2017-07-21 | 四川东树新材料有限公司 | A kind of preparation facilities of vacuum assisted resin infusion composite laminated plate |
| CN112026201A (en) * | 2020-07-27 | 2020-12-04 | 国营芜湖机械厂 | Method for rapidly repairing metal crack damage by composite material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116001311A (en) * | 2022-12-26 | 2023-04-25 | 江西洪都航空工业集团有限责任公司 | Method for rapidly tearing off resin film release paper of bismaleimide system |
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