CN114654864B - Preparation method of honeycomb sandwich structure acoustic liner plate - Google Patents
Preparation method of honeycomb sandwich structure acoustic liner plate Download PDFInfo
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- CN114654864B CN114654864B CN202210169473.9A CN202210169473A CN114654864B CN 114654864 B CN114654864 B CN 114654864B CN 202210169473 A CN202210169473 A CN 202210169473A CN 114654864 B CN114654864 B CN 114654864B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1207—Heat-activated adhesive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
- B32B37/1018—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure using only vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/04—Punching, slitting or perforating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1207—Heat-activated adhesive
- B32B2037/1215—Hot-melt adhesive
- B32B2037/1223—Hot-melt adhesive film-shaped
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Laminated Bodies (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention relates to a preparation method of a honeycomb sandwich structure acoustic liner plate, which comprises the following steps: step 1, drilling an acoustic liner array hole on a first panel; bonding an adhesive film on the first panel, and then bonding a honeycomb core on the adhesive film; step 2, placing the honeycomb core on a tooling under the first panel; sleeving the first panel and the honeycomb core by the vacuum bag, and sealing the edge of the vacuum bag and the tooling; step 3, putting the film into a heating device with a vacuum system, adjusting the temperature of the heating device until the temperature displayed by a thermocouple is the hot breaking temperature of the film, repeatedly vacuumizing, and breaking the film in the holes of the acoustic liner array; step 4, taking out, and removing the vacuum bag and the thermocouple; and then the second panel is arranged on the other end face of the honeycomb core through an adhesive film, so that the honeycomb sandwich-structure acoustic liner panel is obtained. The preparation method does not damage the honeycomb core, and does not pollute the adhesive film to influence the subsequent adhesive bonding quality. The equipment requirement is low, and the quality control is convenient.
Description
Technical Field
The invention relates to the technical field of honeycomb sandwich structures, in particular to a preparation method of a honeycomb sandwich structure acoustic liner plate.
Background
Honeycomb sandwich structured acoustic liner panels are widely used in the aerospace field. The prior method for manufacturing the acoustic liner array holes of the acoustic liner wall plate mainly adopts an adhesive to bond the upper surface and the lower surface of the honeycomb core and the composite material panel into a honeycomb sandwich composite material structure, and then adopts numerical control equipment to drill the acoustic liner array holes to prepare the acoustic liner wall plate of the honeycomb sandwich composite material. Another method is shown in chinese patent CN 110815901A, in which the adhesive film and the panel are pre-glued at a temperature lower than the curing temperature, protected by a peelable cloth, and then the acoustic lining hole array is drilled, and then glued.
Thus, in the manufacture of acoustic liner panels, there is a need to find a way to manufacture acoustic liner panels that does not damage the honeycomb core cell walls nor contaminate the adhesive film.
Disclosure of Invention
The invention aims at: aiming at the problems of damage to the honeycomb core cell wall or pollution of the adhesive film in the preparation method of the honeycomb sandwich structure acoustic liner plate in the prior art, the preparation method of the honeycomb sandwich structure acoustic liner plate is provided, and the preparation method does not damage the honeycomb core and does not pollute the adhesive film to influence the subsequent adhesive quality. The whole construction process can be completed in a heating device with a vacuum system, the equipment requirement is low, the control is convenient, and the quality of the finished product is high.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method for preparing a honeycomb sandwich structure acoustic liner panel, comprising the steps of:
step 2, placing the honeycomb core on a tooling under the first panel; placing a thermocouple which is contacted with the adhesive film; sleeving the first panel and the honeycomb core by a vacuum bag, and sealing the edge of the vacuum bag and the tooling, wherein a ventilation structure communicated with the outside is arranged in the vacuum bag;
step 3, placing the vacuum bag packaging structure obtained in the step 2 together with the tool into a heating device with a vacuum system, adjusting the temperature of the heating device until the temperature displayed by a thermocouple is the hot breaking temperature of the adhesive film, repeatedly vacuumizing, and breaking the adhesive film in the holes of the acoustic liner array;
step 4, taking out the vacuum bag packaging structure of the step 3 together with the tool, and removing the vacuum bag and the thermocouple; and then the second panel is arranged on the other end face of the honeycomb core through an adhesive film, and curing treatment is carried out to obtain the honeycomb sandwich structure acoustic liner panel.
The invention discloses a novel preparation method of a honeycomb sandwich structure acoustic liner plate, which comprises the steps of firstly drilling acoustic liner array holes on a panel; and then bonding the honeycomb core and the panel together by using the adhesive film, and forming a pressure difference between the inside and the outside of the honeycomb core by repeatedly vacuumizing and then introducing the atmosphere at a proper temperature, so that the adhesive film breaks at the sound lining holes of the panel under the pressure difference, the adhesive film is adhered to the panel after being thermally broken due to the surface tension, and the adhesive film is not adhered at the sound lining display holes, thereby realizing the purposes that the adhesive film is thermally broken and a through hole is formed when the adhesive film is to be adhered, and the honeycomb core is not damaged and the adhesive film is not polluted to influence the subsequent adhesive quality in the whole preparation process. The whole construction process can be completed in a heating device with a vacuum system, the equipment requirement is low, the control is convenient, the quality of finished products is high, and the wide popularization and the use are convenient.
Further, the adhesive film is a fabric-free (carrier) adhesive film.
Further, in the step 1, the method further comprises the steps of performing surface treatment on the first panel by using a polishing or sand blowing method, cleaning and airing for later use; the honeycomb core to be glued is cleaned and dried.
Further, in the step 2, before the vacuum bag is sleeved on the first panel and the honeycomb core, a porous isolating film and an airfelt are sequentially laid on the top surface of the first panel, and a vacuum nozzle is placed on the airfelt. Wherein, the ventilation structure is a vacuum nozzle. And the upper airfelt is arranged on the first panel, which is more beneficial to the vacuumizing efficiency of the vacuum bag.
Further, the heating device with the vacuum system in the step 3 is an autoclave or an oven.
Further, in the step 3, the vacuum is repeatedly pumped for 2-5 times. Under proper temperature control, the adhesive film can be broken by repeatedly vacuumizing for 2-5 times, and the operation is more convenient. The adhesive film is not broken yet after repeated vacuumizing for too many times, and the adhesive film is difficult to break later. Preferably, in the step 3, the vacuum is repeatedly applied for 2-3 times.
In step 3, the hot breaking temperature of the adhesive film is determined by testing the adhesive temperature curve and the adhesive time curve of the adhesive film.
In the bonding process of the adhesive film and the panel with the array holes, the adhesive film rupture at the corresponding array holes on the panel cannot be ensured. The adhesive film thermal breaking temperature is determined by testing the adhesive temperature curve and the adhesive time curve of the adhesive film. Under lower viscosity, a heating temperature is given to the adhesive film, the adhesive film has certain fluidity under microcosmic, and can not be solidified in a certain time, so that the adhesive film of the array holes can be broken after repeated vacuum pumping for 2-5 times, the operation is convenient, the success rate is high, and no additional equipment is needed for hot breaking of the adhesive film. The temperature setting is too low, the microscopic fluidity of the adhesive film is not changed greatly after heating, and the adhesive film is destroyed by vacuum pressure difference, so that the adhesive film is difficult to realize. However, if the temperature is too high, the adhesive film tends to be more viscous during repeated vacuuming, and is easily cured, so that the adhesive film is difficult to break.
Further, the thermal breaking temperature of the adhesive film is mainly determined by the following method:
s1, testing a viscosity-temperature curve of the adhesive film (3) used in the step 1, and cutting out a temperature section of a low-viscosity area.
S2, selecting a plurality of temperature point values of a temperature section of a low viscosity area, performing rheological test on the adhesive film reaching the temperature points to obtain a viscous time curve, and selecting a temperature point value with the corresponding time before the viscosity is increased of more than or equal to 30 minutes as the thermal breaking temperature of the adhesive film according to the viscous time curve.
The time is too short, the re-solidification can be generated in the shorter time, the vacuum can not be repeatedly pumped out for many times, and the pressure difference can not be formed repeatedly from top to bottom of the adhesive film, so that the rupture of the adhesive film can not be realized.
Further, in the step S2, at least 3 temperature points are selected from the low temperature to the high temperature in the temperature section of the low viscosity region for rheological test, so as to obtain a viscous time curve.
Further, a temperature point value with the corresponding time of more than or equal to 40 minutes before the viscosity is increased is selected as the hot breaking temperature of the adhesive film.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
the invention discloses a novel preparation method of a honeycomb sandwich structure acoustic liner plate, which comprises the steps of firstly drilling acoustic liner array holes on a panel; and then bonding the honeycomb core and the panel together by using the adhesive film, and forming a pressure difference between the inside and the outside of the honeycomb core by repeatedly vacuumizing and then introducing the atmosphere at a proper temperature, so that the adhesive film breaks at the sound lining holes of the panel under the pressure difference, the adhesive film is adhered to the panel after being thermally broken due to the surface tension, and the adhesive film is not adhered at the sound lining display holes, thereby realizing the purposes that the adhesive film is thermally broken and a through hole is formed during pre-bonding, and the honeycomb core is not damaged and the adhesive film is not polluted to influence the subsequent bonding quality in the whole preparation process. The whole construction process can be completed in a heating device with a vacuum system, the equipment is convenient to control, the quality of finished products is high, and the equipment is convenient to popularize and use widely.
Drawings
Fig. 1 is a schematic structural view of a first panel in embodiment 1.
Fig. 2 is a schematic structural diagram of the vacuum packaging structure associated tooling in embodiment 1.
Fig. 3 is a schematic structural view of the honeycomb sandwich-structured acoustic liner panel of example 1.
FIG. 4 is a tack time curve of the adhesive film at 100deg.C in example 1.
Icon: 1-a first panel; 11-acoustic liner array holes; 12-a porous barrier film; 13-airfelt; 14-vacuum nozzle; 2-a second panel; 3-adhesive film; 4-honeycomb core; 5-tooling; 6-thermocouple; 7-vacuum bag.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
And selecting an adhesive film without fabric with the curing temperature of EA9658 060UNS AERO of 180 ℃.
The preparation of the honeycomb sandwich-structured acoustic liner plate comprises the following steps:
step 2, placing the honeycomb core 4 on the tooling 5 under the first panel 1; a thermocouple 6 is arranged, and the thermocouple 6 is contacted with the adhesive film 3; a porous barrier film 12 and an airfelt 13 are sequentially laid on the top surface of the first panel 1, and a vacuum nozzle 14 is placed on the airfelt 13. Sleeving the first panel 1 and the honeycomb core 4 by a vacuum bag 7, and sealing the edge of the vacuum bag 7 and the tooling 5; as shown in fig. 2.
Step 3, placing the vacuum bag packaging structure obtained in the step 2 together with the tool 5 into an autoclave with a vacuum system, adjusting the temperature of a heating device until the temperature displayed by a thermocouple 6 is the hot breaking temperature of the adhesive film, repeatedly vacuumizing for 3 times, and completely breaking the adhesive film in the acoustic lining array holes 11;
step 4, taking out the vacuum bag packaging structure of the step 3 together with the tool 5 from an autoclave or an oven with a vacuum system, and removing the vacuum bag 7 and the thermocouple 6; and then the second panel 2 is arranged on the other end face of the honeycomb core 4 through the adhesive film 3, and the curing treatment is carried out, so that the honeycomb sandwich structure acoustic liner plate is obtained. The second panel 2 may also be formed by directly laying prepreg on the adhesive film and curing the prepreg by co-bonding. As shown in fig. 3.
The rheometer is adopted to test the rheology of the adhesive film to obtain a viscosity temperature curve, then the adhesive film hot breaking temperature is measured by a viscosity time curve of the temperature 80 ℃,90 ℃ and 100 ℃ in a region with a lower viscosity value, the condition that the viscosity of the adhesive film is reduced at 100 ℃ is found, the time of the adhesive film with the lower viscosity of 220Pa.s is 30 minutes, and repeated vacuumizing can be carried out at the temperature to enable the adhesive film to be hot broken. Therefore, the situation that the adhesive film is completely broken after the adhesive film is thermally broken at 100 ℃ and is repeatedly vacuumized for 3 times according to the step 3 is determined.
The tack-time curve at 100℃is shown in FIG. 4.
The invention discloses a novel preparation method of a honeycomb sandwich structure acoustic liner plate, which comprises the steps of firstly drilling acoustic liner array holes on a panel; and then bonding the honeycomb core and the panel together by using the adhesive film, and forming a pressure difference between the inside and the outside of the honeycomb core by repeatedly vacuumizing and then introducing the atmosphere at a proper temperature, so that the adhesive film breaks at the sound lining holes of the panel under the pressure difference, the adhesive film is adhered to the panel after being thermally broken due to the surface tension, and the adhesive film is not adhered at the sound lining display holes, thereby realizing the purposes that the adhesive film is thermally broken and a through hole is formed during pre-bonding, and the honeycomb core is not damaged and the adhesive film is not polluted to influence the subsequent bonding quality in the whole preparation process. The whole construction process can be completed in a heating device with a vacuum system, the equipment requirement is low, the control is convenient, the quality of finished products is high, and the wide popularization and the use are convenient.
Comparative example 1
Comparative example 1 the same adhesive film of example 1 was used to carry out the same preparation process of example 1, except that example 2 changed the heat-break temperature of the adhesive film to 90 ℃. According to the viscosity time curve, at 90 ℃, the corresponding time before the viscosity rises is 20min, the adhesive film in the array hole in comparative example 1 is repeatedly vacuumized for 10 times, the adhesive film cannot be completely broken by heat, the adhesive film cannot be cured again in a short time, and the adhesive film cannot be broken by repeatedly vacuuming for many times.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. A method for preparing a honeycomb sandwich structure acoustic liner panel, comprising the steps of:
step 1, preparing a first panel (1) and a second panel (2), and drilling an acoustic liner array hole (11) on the first panel (1); bonding an adhesive film (3) on the bottom surface of the first panel (1), and then bonding the top surface of the honeycomb core (4) on the adhesive film (3);
step 2, placing the honeycomb core (4) on a tool (5) under the first panel (1) on the upper part; a thermocouple (6) is arranged, and the thermocouple (6) is contacted with the adhesive film (3); sleeving a first panel (1) and a honeycomb core (4) by a vacuum bag (7), and sealing the edge of the vacuum bag (7) with a tool (5), wherein a ventilation structure communicated with the outside is arranged in the vacuum bag (7);
step 3, putting the vacuum bag packaging structure obtained in the step 2 together with the tool (5) into a heating device with a vacuum system, adjusting the temperature of the heating device until the temperature displayed by a thermocouple (6) is the hot breaking temperature of the adhesive film, repeatedly vacuumizing, and breaking the adhesive film in the acoustic liner array hole (11);
step 4, taking out the vacuum bag packaging structure of the step 3 together with the tool (5), and removing the vacuum bag (7) and the thermocouple (6); then, the second panel (2) is arranged on the other end face of the honeycomb core (4) through the adhesive film (3), and the curing treatment is carried out to obtain the honeycomb sandwich structure acoustic liner panel; the adhesive film thermal breaking temperature is mainly determined by the following method:
s1, testing a viscosity-temperature curve of the adhesive film (3) used in the step 1, and cutting off a temperature section of a low-viscosity area;
s2, selecting a plurality of temperature point values of a temperature section of a low viscosity area, performing rheological test on the adhesive film reaching the temperature points to obtain a viscous time curve, and selecting a temperature point value with the corresponding time before the viscosity is increased of more than or equal to 30 minutes as the thermal breaking temperature of the adhesive film according to the viscous time curve.
2. The method for manufacturing the honeycomb sandwich-structured acoustic liner panel according to claim 1, wherein in the step 1, the surface treatment is performed on the first panel (1) and the second panel (2) by polishing or sand blowing, and the honeycomb sandwich-structured acoustic liner panel is cleaned and dried for later use; the honeycomb core (4) to be glued is cleaned and dried.
3. The method for manufacturing the honeycomb sandwich-structured acoustic liner panel according to claim 1, wherein in the step 2, before the vacuum bag (7) is sleeved on the first panel (1) and the honeycomb core (4), a porous isolating film (12) and an airfelt (13) are sequentially laid on the top surface of the first panel (1), and a vacuum nozzle (14) is placed on the airfelt (13).
4. The method for producing a honeycomb sandwich-structured acoustic liner panel according to claim 1, wherein the heating device with a vacuum system in step 3 is an autoclave or an oven.
5. The method for producing a honeycomb sandwich-structured acoustic liner panel according to claim 1, wherein in step 3, the vacuum is repeatedly applied 2 to 5 times.
6. The method of claim 5, wherein in step 3, the vacuum is repeatedly applied 2-3 times.
7. The method according to claim 1, wherein in the step S2, at least 3 temperature points from low temperature to high temperature are selected for rheological test in the low viscosity region temperature section, so as to obtain a viscous time curve.
8. The method for producing a honeycomb sandwich-structured acoustic liner panel according to claim 1, wherein a temperature point value corresponding to a time of 40min or more before the viscosity is raised is optionally selected as the hot breaking temperature of the adhesive film.
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| CN107804046A (en) * | 2017-09-18 | 2018-03-16 | 航天材料及工艺研究所 | A kind of composite sound-deadening and noise-reducing sound lining and preparation method thereof |
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| FR2839075B1 (en) * | 2002-04-25 | 2006-05-19 | Airbus France | PERFORATED ADHESIVE FILM AND METHOD FOR MANUFACTURING THE SAME |
| US6736181B2 (en) * | 2002-09-26 | 2004-05-18 | Gkn Westland Aerospace, Inc. | Method and apparatus for applying a film adhesive to a perforated panel |
| CN103600570A (en) * | 2013-08-23 | 2014-02-26 | 中国航空工业集团公司西安飞机设计研究所 | Bonding method of honeycomb sandwich structure of micro-perforated panel |
| CN104553238B (en) * | 2014-12-12 | 2016-09-14 | 中航复合材料有限责任公司 | Hotting mask blows brokenly the method that method strengthens class honeycomb poroid structural core surface stability |
| CN104494276B (en) * | 2014-12-18 | 2016-06-29 | 北京卫星制造厂 | A kind of honeycomb core end face gridding glue-applying technique method broken based on glued membrane heat |
| CN106393710A (en) * | 2016-11-08 | 2017-02-15 | 深圳市知宇新材料应用研究院有限公司 | Gluing method, structure and parts of micro-perforated panel and honeycomb sandwich structure |
| CN108928050B (en) * | 2017-12-14 | 2020-09-08 | 中航复合材料有限责任公司 | Preparation method, equipment and structure of honeycomb sandwich structure containing micro-perforated panel |
| US11123948B2 (en) * | 2018-11-13 | 2021-09-21 | Epic Aircraft, LLC | Method for forming a composite structure |
| CN111793450B (en) * | 2020-07-23 | 2023-01-24 | 黑龙江省科学院石油化学研究院 | Medium-high temperature curing epoxy structure adhesive film with thermal breaking performance applied to sound absorption and noise reduction honeycomb plate and preparation method thereof |
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| CN107804046A (en) * | 2017-09-18 | 2018-03-16 | 航天材料及工艺研究所 | A kind of composite sound-deadening and noise-reducing sound lining and preparation method thereof |
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