CN109682551B - Novel composite material mold airtightness detection system - Google Patents
Novel composite material mold airtightness detection system Download PDFInfo
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- CN109682551B CN109682551B CN201811398751.8A CN201811398751A CN109682551B CN 109682551 B CN109682551 B CN 109682551B CN 201811398751 A CN201811398751 A CN 201811398751A CN 109682551 B CN109682551 B CN 109682551B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
Abstract
The invention discloses a novel system for detecting airtightness of a composite material mould, which comprises a vacuum joint, a vacuum bag film, a metal air guide plate and an air felt, wherein the metal air guide plate is arranged in the vacuum bag film, and a layer of air felt is laid on the surface of the metal air guide plate; the top of the vacuum bag film is provided with a vacuum joint, a metal air guide plate is arranged below the vacuum joint, and the bottom of the metal air guide plate is fixed on the composite material mould through a pressure sensitive adhesive tape; the metal air guide plate is provided with a plurality of through exhaust holes, and the lower surface of the metal air guide plate is provided with a plurality of transverse vent grooves. The invention strengthens the air permeability of the air permeable felt through the metal air guide plate, eliminates the problem of vacuum blocking, is beneficial to improving the vacuum degree and the vacuum uniformity in the vacuum bag film, improves the high-temperature and high-pressure air tightness of the invention, and improves the reliability and the stability of the measurement system in the high-temperature and high-pressure stage.
Description
Technical Field
The invention belongs to the technical field of air tightness devices, and particularly relates to a novel air tightness detection system for a composite material die.
Background
Modern military and civil aircrafts are made of composite materials in large quantity, and composite material molds are needed for molding and gluing of composite material parts and components. At present, the processes of heating, pressurizing and vacuumizing in a hot-pressing tank are mainly adopted for forming and gluing high-performance composite material parts, and therefore strict requirements are imposed on the air tightness of composite material molds.
The standard for judging whether the composite material mold is airtight and qualified by a certain airplane of an airbus company is as follows: detecting at room temperature and normal pressure, wherein the vacuum degree is not more than-0.80 bar, and the vacuum leakage is not more than 0.17bar in 5 minutes, which is qualified; detecting at high temperature and high pressure, wherein the vacuum degree is not more than-0.80 bar, heating to 180 + -5 deg.C, pressurizing to (3 + -0.2) bar, and when the pressure reaches 1.4bar, venting the vacuum bag to atmosphere, and the pressure in the vacuum bag is not more than +0.17 bar.
The standard for judging whether the composite material mould is airtight and qualified by a domestic airplane is as follows: detecting at room temperature and normal pressure, wherein the vacuum degree is not more than-0.80 bar, stabilizing for 15 min, stopping vacuum source pumping, and vacuum leakage is not more than 0.17bar for 5 min; detecting at high temperature and high pressure, vacuumizing at least-0.80 bar, applying pressure (3.10 + -0.34) bar, heating to 138 + -5 deg.C at 0.5-3 deg.C/min, and venting the vacuum bag to atmosphere when the pressure reaches 1.4 bar; keeping the temperature and the pressure for 15 minutes until the positive pressure in the vacuum bag does not exceed 0.17bar, or keeping the positive pressure in the vacuum bag to not exceed 0.34bar for 60 minutes.
The standard for judging whether the composite material mold is airtight and qualified according to the national aviation industry standard HB 5342 and 2012 'composite material aviation part process quality control': the vacuum degree is not more than-0.92 bar, the vacuumizing is stopped after the vacuum degree is kept stable, and the vacuum leakage is not more than 0.17bar in 10 minutes, so that the product is qualified.
The latest judgment standard of the compound material mould airtight qualification of our company is as follows: and (3) detection at room temperature and normal pressure: the vacuum degree is not more than-0.85 bar, after stabilizing for 10 minutes, the vacuumizing is stopped, and the vacuum leakage is not more than 0.04bar in 10min, which is qualified; performing cold pressure detection, wherein the vacuum degree is not more than-0.85 bar, pressurizing to (6.8 +/-0.30) bar, keeping the vacuum value after stabilization to be not more than-0.70 bar, stopping vacuumizing, and determining that the leakage is not more than 0.05bar within 5 minutes as qualified; and (3) detecting at high temperature, wherein the pressure in the tank is (6.8 +/-0.30) bar, heating to 180 ℃ at the heating rate of 2-5 ℃/min, starting timing by using the slowest thermocouple of the composite material mold to enter the curing temperature, keeping the temperature for 35min, and then stopping vacuumizing, wherein the vacuum leakage does not exceed 0.10bar in 5min and the vacuum value is negative, so that the product is qualified. The standard of our company is obviously higher than the published domestic and foreign standards.
The composite material mould airtight detection system in the prior art is shown in figure 3 and comprises four parts, namely a sealing rubber strip, a vacuum bag film, an air felt and a vacuum joint, 99% of composite material moulds are airtight qualified according to relevant airtight sealing standard after being used for many years, 99% of composite material moulds can reach the room temperature, normal pressure and cold pressure qualified standard in the latest standard of a company, but about 50% of composite material moulds cannot be subjected to high-temperature and high-pressure airtight detection for the first time to reach the company standard, and the scientific research and production of the company are seriously influenced.
Theoretical analysis of the cause of failure in gas tightness: according to the composite material mold airtightness detection system, whether the maximum service temperature of a material which is rated by a supplier can reach 200 ℃ or above (exceeds the company airtightness detection standard of 180 ℃) is taken as a main basis for each part of materials, the price, the purchaseability, the purchase period, the inventory condition requirement, the storage cost and the like of the material are taken as important bases, and other performances of each material, such as temperature resistance time, airtightness and stability of the material under high temperature and high pressure, are not brought into the optimization of the same important parameters.
Theoretical analysis of the cause of failure in gas tightness: in the composite material mold airtightness detection system in the prior art, under the environment of temperature of 180 ℃ and pressure of 6.8bar, assuming that the vacuum leakage value of the composite material mold is A0, the vacuum leakage value of the sealing rubber strip of the prior performance material is A1, the vacuum leakage value of the vacuum bag film is A2, the vacuum leakage value of the air-permeable felt is A3, the vacuum leakage value of the vacuum joint is A4, the leakage value displayed by a vacuum table is B, and the standard qualification index of the company is C, a data chain meeting the company standard should meet the following conditions: a0+ A1+ A2+ A3+ A4= B ≤ C; when a0+ a1+ a2+ A3+ a4= B > C, it indicates that airtightness is not satisfactory. Whether the values of the air tightness detection systems A1, A2, A3 and A4 are 0, particularly, how many values are, cannot be obtained from supplier data, so that the air tightness of the composite material die tool cannot be directly judged to be unqualified when B is larger than C.
Theoretical analysis of the cause of failure in gas tightness: according to the composite material mold airtight detection system, under the environment of temperature of 180 ℃ and pressure of 6.8bar, the airtight qualified rate of the composite material mold is assumed to be X0, the airtight qualified rate of the sealing rubber strip of the previous performance material is X1, the airtight qualified rate of the vacuum bag film is X2, the airtight qualified rate of the breathable felt is X3, the airtight qualified rate of the vacuum joint is X4, and the airtight qualified rate of the whole system is X0 multiplied by X1 multiplied by X2 multiplied by X3 multiplied by X4. Examples are: assuming that X0=95%, X1=95%, X2=95%, X3=95%, and X4=95%, the airtight yield of the entire system is X0 × X1 × X2 × X3 × X4=0.95 × 0.95 × 0.95 × 0.95 × 0.95=77.4%, and the airtight yield is increased by (1-77.4%)/(1-95%) =4.5 times, indicating that the influence of the yield of the airtight inspection system on the inspection result is very significant. Since whether or not the values of the airtightness detection systems X1, X2, X3 and X4 are 100%, specifically, how many values are not obtained from supplier data, it is not possible to directly judge that the composite material mold tooling is 100% airtight and not qualified when B > C.
Test verification of the failure reason of air tightness: according to the composite material mould air tightness detection system in the prior art, multiple test data show that the composite material mould air tightness detection system is used in an environment with the temperature of 180 ℃ and the pressure of 6.8 bar: the detection data of the same set of composite material die are different and greatly different, which indicates that the air tightness detection system formed by the four parts is unstable and fluctuates greatly under high temperature and high pressure, and the qualified composite material die air tightness can be judged as unqualified; in multiple airtight tests, A0 is constant, B fluctuates and changes, which shows that the total leakage amount A1+ A2+ A3+ A4 of the test system fluctuates and changes; when A0+ A1+ A2+ A3+ A4= B ≤ C is obtained once, the air tightness detection data meeting the company standard can be proved only when the total leakage quantity of the detection system A1+ A2+ A3+ A4= B-A0 ≤ C-A0 is obtained, and the air tightness of the composite material die tool is judged to be qualified according to the air tightness detection data, but in actual detection, the accurate value of A1+ A2+ A3+ A4 cannot be obtained.
Test verification of the failure reason of air tightness: according to the composite material mould air tightness detection system in the prior art, multiple test data show that the composite material mould air tightness detection system is used in an environment with the temperature of 180 ℃ and the pressure of 6.8 bar: in the same set of composite material mold and the same detection, the data of two or more vacuum meters in the vacuum bag film are often different and even greatly different, sometimes, one meter data is qualified, and the other meter data is unqualified, so that the original airtight detection system is proved to generate vacuum blocking (namely, the air permeability of the air felt is poor, the internal gas cannot flow) under high temperature and high pressure for a long time, and the residual or leaked gas cannot be pumped away, thereby influencing the airtight qualification judgment of the composite material mold.
Based on the theoretical analysis and experimental verification: leakage rates A1, A2, A3 and A4 of the composite material die tool air tightness detection system, qualification rates X1, X2, X3 and X4, air permeability of the air felt, great influence on air tightness detection conclusion of the air tightness composite material die, and possibility of 'misjudgment'; the best detection data can be found by repeated detection, but the detection period is long and the cost is high. Therefore, the high-temperature and high-pressure air tightness performance of each component of the composite material tool air tightness detection system needs to be improved, and the self qualification rate is improved.
Disclosure of Invention
The invention aims to provide a novel system for detecting the airtightness of a composite material mould, which strengthens the air permeability of an air-permeable felt through a metal air guide plate, eliminates the problem of vacuum blocking, is favorable for improving the vacuum degree and vacuum uniformity in a vacuum bag film and has better practicability; the invention improves the high-temperature and high-pressure air tightness, eliminates the vacuum blocking in the high-temperature and high-pressure stage, and improves the reliability and stability of the measurement system in the high-temperature and high-pressure stage.
The invention is mainly realized by the following technical scheme: a novel composite material mold airtightness detection system comprises a vacuum joint, a vacuum bag film, a metal air guide plate and an air felt, wherein the metal air guide plate is arranged in the vacuum bag film, and a layer of air felt is laid on the surface of the metal air guide plate; the top of the vacuum bag film is provided with a vacuum joint, a metal air guide plate is arranged below the vacuum joint, and the bottom of the metal air guide plate is fixed on the composite material mould through a pressure sensitive adhesive tape; the metal air guide plate is provided with a plurality of through exhaust holes, and the lower surface of the metal air guide plate is provided with a plurality of transverse vent grooves.
The metal air guide plate can be made of metal materials such as aluminum, stainless steel and the like. The thickness of the air guide plate is 2-3mm, an air guide groove and an air guide hole are formed, the fit clearance between the air guide plate and the molded surface of the composite material mold is not more than 2mm under the conditions of room temperature and no pressure, the air guide plate is positioned at the bottom of the vacuumizing joint and the vacuum joint, and the air guide plate is isolated from the vacuum joint by an air permeable felt. The invention is particularly suitable for detecting the air tightness qualification of the composite material mould with the temperature of 180 ℃, the pressure of 6.8bar and the vacuum leakage of not more than 0.10 bar.
The metal air guide plate is provided with an air guide groove and an air guide hole as shown in figure 2, is manually bent and knocked to be attached to the molded surface of the composite material mold, is adhered and fixed on the composite material mold through a pressure sensitive adhesive tape, is positioned at the bottom of the vacuumizing joint and the vacuum checking joint, forms an air flow channel with the vacuumizing joint and the vacuum checking joint, is isolated from the vacuum joints through an air permeable felt, and can be selected from but not limited to metal materials such as aluminum, stainless steel and the like.
In order to better realize the invention, further, the exhaust holes on the metal air guide plate are arranged in a matrix, and the distance between the adjacent exhaust holes is 5-10 mm; the vent grooves on the metal air guide plate are arranged in a matrix shape, and the distance between every two adjacent vent grooves is 3-5 mm.
In order to better realize the invention, further, the thickness of the metal air guide plate is 2-3 mm; the depth of the vent groove is 0.5-1 mm; the diameter of the exhaust hole is 0.5-1.2 mm; the fit clearance between the bottom surface of the metal air guide plate and the molded surface of the composite material mold is not more than 2 mm.
In order to better realize the invention, the vacuum bag further comprises a sealing rubber strip, wherein the vacuum bag film and the sealing rubber strip are flush along the periphery, and a pressure-sensitive adhesive tape is pasted along the periphery.
In order to better realize the invention, further, the temperature resistance of the sealing rubber strip is not lower than 232 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours; the temperature resistance of the vacuum bag film is not lower than 246 ℃, the high-temperature and high-pressure performance stabilization time is not less than 3 hours, and the thickness is 0.075 mm; the temperature resistance of the air felt is not lower than 232 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours; the temperature resistance of the vacuum joint is not lower than 260 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours; the temperature resistance of the metal air guide plate is not lower than 300 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours; the temperature resistance of the pressure sensitive adhesive tape is not lower than 204 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours.
In order to better realize the invention, the sealing rubber strip is AA 15 or GS-43 MR; the model of the vacuum bag film is WIN 1500; the type of the breathable felt is 1332; the model of the vacuum joint is VV 406 TF; the type of the pressure sensitive adhesive tape is Flashbreaker 2.
In order to better implement the invention, further, the vacuum joint comprises an evacuation joint and a vacuum detection joint.
Bagging according to the following steps: (1) cleaning the molded surface and the bagging area of the composite material mold, wiping the molded surface and the bagging area by using white cotton cloth, and keeping the white cotton cloth clean to be qualified; (2) the method comprises the following steps that sealing rubber strips are pasted along the periphery of a bagging area, a metal air guide plate is placed at the position of a vacuumizing joint and a vacuum detection joint and is fixed by pressure-sensitive adhesive tapes, a layer of breathable felt is paved on the surface, a vacuum bag film is paved, a small hole with the diameter of about 20mm is cut in the vacuum bag film on the metal air guide plate, the vacuumizing joint is installed and the vacuum detection joint is detected, the vacuum bag film is trimmed to be flush with the sealing rubber strips along the periphery, air between the vacuum bag film and the sealing rubber strips is discharged by a scraper blade and is ensured to be firmly attached, the pressure-sensitive adhesive tapes are pasted along the periphery, internal air is discharged by the scraper blade and is ensured to be firmly attached, thermocouples with the specified quantity and position are installed.
Submitting the compound material mould that airtight detected, should carry out the conventional inspection that influences airtight qualified all factors and eliminate hidden danger earlier, if: profile, hole, boss, cavity have not had sharp limit, burr, corrosion, greasy dirt, dust etc. roughness should not be less than Ra1.6, and the welding seam has carried out nondestructive test and qualified, and minimum wall thickness such as all locating pin holes, screw hole, cavity is not less than 5mm, promptly: the composite material mould material object ensures that the theoretical air tightness is qualified.
The invention has the beneficial effects that:
(1) the metal air guide plate is arranged in the vacuum bag film, and a layer of breathable felt is laid on the surface of the metal air guide plate; the top of the vacuum bag film is provided with a vacuum joint, a metal air guide plate is arranged below the vacuum joint, and the bottom of the metal air guide plate is fixed on the composite material mould through a pressure sensitive adhesive tape; the metal air guide plate is provided with a plurality of through exhaust holes, and the lower surface of the metal air guide plate is provided with a plurality of transverse vent grooves. The invention strengthens the air permeability of the air-permeable felt through the metal air guide plate, eliminates the problem of vacuum blocking, is beneficial to improving the vacuum degree and the vacuum uniformity in the vacuum bag film and has better practicability; the invention improves the high-temperature and high-pressure air tightness, eliminates the vacuum blocking in the high-temperature and high-pressure stage, and improves the reliability and stability of the measurement system in the high-temperature and high-pressure stage.
(2) The exhaust holes on the metal air guide plate are arranged in a matrix, and the distance between every two adjacent exhaust holes is 5-10 mm; the vent grooves on the metal air guide plate are arranged in a matrix shape, and the distance between every two adjacent vent grooves is 3-5 mm. The invention better strengthens the air permeability of the air permeable felt through the metal air guide plate, eliminates the problem of vacuum blocking, better improves the vacuum degree and the vacuum uniformity in the vacuum bag film and has better practicability.
(3) The temperature resistance of the sealing rubber strip is not lower than 232 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours; the temperature resistance of the vacuum bag film is not lower than 246 ℃, the high-temperature and high-pressure performance stabilization time is not less than 3 hours, and the thickness is 0.075 mm; the temperature resistance of the air felt is not lower than 232 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours; the temperature resistance of the vacuum joint is not lower than 260 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours; the temperature resistance of the metal air guide plate is not lower than 300 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours; the temperature resistance of the pressure sensitive adhesive tape is not lower than 204 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours. The invention optimizes the performance of each component material, improves the service performance of the device and has better practicability.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a metal air guide plate;
fig. 3 is a schematic structural diagram of a conventional airtightness detection system.
Wherein: 1-composite material mould, 2-sealing adhesive tape, 3-vacuum bag film, 4-air felt, 5-vacuum joint, 5.1-vacuum joint, 5.2-vacuum joint, 6-metal air guide plate, 7-pressure sensitive adhesive tape, 8-upper molded surface, 9-air vent, 10-lower molded surface and 11-air vent groove.
Detailed Description
Example 1:
a new composite material mold airtightness detection system is shown in figure 1, and comprises a vacuum joint 5, a vacuum bag film 3, a metal air guide plate 6 and an air felt 4, wherein the metal air guide plate 6 is arranged in the vacuum bag film 3, and a layer of air felt 4 is laid on the surface of the metal air guide plate 6; the top of the vacuum bag film 3 is provided with a vacuum joint 5, a metal air guide plate 6 is arranged below the vacuum joint 5, and the bottom of the metal air guide plate 6 is fixed on the composite material mould 1 through a pressure sensitive adhesive tape 7; the metal air guide plate 6 is provided with a plurality of through exhaust holes 9, and the lower surface of the metal air guide plate 6 is provided with a plurality of transverse vent grooves 11.
As shown in fig. 3, the conventional airtightness detecting apparatus does not have the metal air guide 6 and the pressure-sensitive adhesive tape 7. The invention strengthens the air permeability of the air felt 4 through the metal air guide plate 6, eliminates the problem of vacuum blocking, is beneficial to improving the vacuum degree and the vacuum uniformity in the vacuum bag film 3, and has better practicability; the invention improves the high-temperature and high-pressure air tightness, eliminates the vacuum blocking in the high-temperature and high-pressure stage, and improves the reliability and stability of the measurement system in the high-temperature and high-pressure stage.
Example 2:
the present embodiment is optimized based on embodiment 1, as shown in fig. 2, the exhaust holes 9 on the metal air guide plate 6 are arranged in a matrix, and the distance between adjacent exhaust holes 9 is 5-10 mm; the air grooves 11 on the metal air guide plate 6 are arranged in a matrix shape, and the distance between every two adjacent air grooves 11 is 3-5 mm.
As shown in fig. 2, d is a diameter of the vent hole 9, C1 is a distance between adjacent vent holes 9, C2 is a distance between adjacent vent grooves 11, H is a thickness of the metal air guide plate 6, and H is a depth of the vent groove 11. And an upper molded surface 8 of the metal air guide plate 6 is contacted with the air felt 4, and a lower molded surface 10 is attached to the molded surface of the composite material mold 1.
The invention better strengthens the air permeability of the air felt 4 through the metal air guide plate 6, eliminates the problem of vacuum blocking, better improves the vacuum degree and the vacuum uniformity in the vacuum bag film 3 and has better practicability.
Other parts of this embodiment are the same as embodiment 1, and thus are not described again.
Example 3:
the embodiment is optimized on the basis of embodiment 1 or 2, and as shown in fig. 2, the thickness of the metal air guide plate 6 is 2-3 mm; the depth of the vent groove 11 is 0.5-1 mm; the diameter of the exhaust hole 9 is 0.5-1.2 mm; the fit clearance between the bottom surface of the metal air guide plate 6 and the molded surface of the composite material mold 1 is not more than 2 mm.
As shown in fig. 2, d is a diameter of the vent hole 9, C1 is a distance between adjacent vent holes 9, C2 is a distance between adjacent vent grooves 11, H is a thickness of the metal air guide plate 6, and H is a depth of the vent groove 11. And an upper molded surface 8 of the metal air guide plate 6 is contacted with the air felt 4, and a lower molded surface 10 is attached to the molded surface of the composite material mold 1.
The invention better strengthens the air permeability of the air felt 4 through the metal air guide plate 6, eliminates the problem of vacuum blocking, better improves the vacuum degree and the vacuum uniformity in the vacuum bag film 3 and has better practicability.
The rest of this embodiment is the same as embodiment 1 or 2, and therefore, the description thereof is omitted.
Example 4:
the embodiment is optimized on the basis of embodiment 1, and as shown in fig. 1, the vacuum bag film 3 is flush with the sealing rubber strip 2 along the circumference, and the pressure-sensitive adhesive tape 7 is adhered along the circumference.
The temperature resistance of the sealing rubber strip 2 is not lower than 232 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours; the temperature resistance of the vacuum bag film 3 is not lower than 246 ℃, the high-temperature and high-pressure performance stabilization time is not less than 3 hours, and the thickness is 0.075 mm; the temperature resistance of the air felt 4 is not lower than 232 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours; the temperature resistance of the vacuum joint 5 is not lower than 260 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours; the temperature resistance of the metal air guide plate 6 is not lower than 300 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours; the temperature resistance of the pressure-sensitive adhesive tape 7 is not lower than 204 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours.
The type of the sealing rubber strip 2 is AA 15 or GS-43 MR; the model of the vacuum bag film 3 is WIN 1500; the type of the breathable felt 4 is 1332; the model of the vacuum joint 5 is VV 406 TF; the type of the pressure sensitive adhesive tape 7 is Flashbreaker 2. The vacuum connector 5 comprises a vacuum-pumping connector 5.1 and a vacuum-detecting connector 5.2. The invention optimizes the performance of each component material, improves the service performance of the device and has better practicability.
The invention strengthens the air permeability of the air felt 4 through the metal air guide plate 6, eliminates the problem of vacuum blocking, is beneficial to improving the vacuum degree and the vacuum uniformity in the vacuum bag film 3, and has better practicability; the invention improves the high-temperature and high-pressure air tightness, eliminates the vacuum blocking in the high-temperature and high-pressure stage, and improves the reliability and stability of the measurement system in the high-temperature and high-pressure stage. The high-temperature and high-pressure sealing performance of the system is enhanced through the arrangement of the pressure-sensitive adhesive tape 7, and the high-temperature and high-pressure sealing system has better practicability.
Other parts of this embodiment are the same as those of embodiment 1, and thus are not described again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (7)
1. The new system for detecting the airtightness of the composite material mold is characterized by comprising a vacuum joint (5), a vacuum bag film (3), a metal air guide plate (6) and an air felt (4), wherein the metal air guide plate (6) is arranged in the vacuum bag film (3), and a layer of air felt (4) is laid on the surface of the metal air guide plate (6); the top of the vacuum bag film (3) is provided with a vacuum joint (5), a metal air guide plate (6) is arranged below the vacuum joint (5), and the bottom of the metal air guide plate (6) is fixed on the composite material mold (1) through a pressure sensitive adhesive tape (7); the metal air guide plate (6) is provided with a plurality of through exhaust holes (9), and the lower surface of the metal air guide plate (6) is provided with a plurality of transverse vent grooves (11).
2. The new system for detecting the airtightness of the composite material mold according to claim 1, wherein the exhaust holes (9) on the metal air guide plate (6) are arranged in a matrix, and the distance between adjacent exhaust holes (9) is 5-10 mm; the vent grooves (11) on the metal air guide plate (6) are arranged in a matrix shape, and the distance between every two adjacent vent grooves (11) is 3-5 mm.
3. The new system for detecting the airtightness of the composite material mold according to claim 1 or 2, wherein the thickness of the metal air guide plate (6) is 2-3 mm; the depth of the vent groove (11) is 0.5-1 mm; the diameter of the exhaust hole (9) is 0.5-1.2 mm; the fit clearance between the bottom surface of the metal air guide plate (6) and the molded surface of the composite material mold (1) is not more than 2 mm.
4. The new system for detecting the airtightness of the composite material mold according to claim 1, further comprising a sealing rubber strip (2), wherein the vacuum bag film (3) is circumferentially flush with the sealing rubber strip (2), and a pressure sensitive adhesive tape (7) is adhered along the circumference.
5. The new system for detecting the airtightness of the composite material mold according to claim 4, wherein the temperature resistance of the sealing rubber strip (2) is not lower than 232 ℃, and the stabilization time of the high-temperature and high-pressure performance is not less than 3 hours; the temperature resistance of the vacuum bag film (3) is not lower than 246 ℃, the high-temperature and high-pressure performance stabilization time is not less than 3 hours, and the thickness is 0.075 mm; the temperature resistance of the air felt (4) is not lower than 232 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours; the temperature resistance of the vacuum joint (5) is not lower than 260 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours; the temperature resistance of the metal air guide plate (6) is not lower than 300 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours; the temperature resistance of the pressure-sensitive adhesive tape (7) is not lower than 204 ℃, and the high-temperature and high-pressure performance stabilization time is not less than 3 hours.
6. The new system for detecting the airtightness of composite material molds according to claim 5, wherein the type of the sealing rubber strip (2) is AA 15 or GS-43 MR; the model of the vacuum bag film (3) is WIN 1500; the type of the breathable felt (4) is 1332; the type of the vacuum joint (5) is VV 406 TF; the pressure sensitive adhesive tape (7) is Flashbreaker 2 in type.
7. The new system for detecting the airtightness of composite material molds according to claim 1, wherein the vacuum joints (5) comprise an evacuation joint (5.1) and a vacuum detection joint (5.2).
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| CN202462892U (en) * | 2012-02-27 | 2012-10-03 | 上海沥高科技有限公司 | Vacuum bag assembly with composite structure |
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