CN116691025A - Forming method of curved surface slotting type composite material antenna window - Google Patents
Forming method of curved surface slotting type composite material antenna window Download PDFInfo
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- CN116691025A CN116691025A CN202310837107.0A CN202310837107A CN116691025A CN 116691025 A CN116691025 A CN 116691025A CN 202310837107 A CN202310837107 A CN 202310837107A CN 116691025 A CN116691025 A CN 116691025A
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- 239000002131 composite material Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 230000008569 process Effects 0.000 claims abstract description 20
- 238000002360 preparation method Methods 0.000 claims abstract description 11
- 238000003754 machining Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000007711 solidification Methods 0.000 claims abstract description 6
- 230000008023 solidification Effects 0.000 claims abstract description 6
- 239000011347 resin Substances 0.000 claims description 31
- 229920005989 resin Polymers 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 27
- 239000000835 fiber Substances 0.000 claims description 26
- 239000004744 fabric Substances 0.000 claims description 17
- 239000010453 quartz Substances 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 230000001680 brushing effect Effects 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 229920001721 polyimide Polymers 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 8
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000002655 kraft paper Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000009719 polyimide resin Substances 0.000 claims description 4
- 230000037303 wrinkles Effects 0.000 claims description 4
- 238000007598 dipping method Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 3
- 238000005491 wire drawing Methods 0.000 claims description 3
- 239000000047 product Substances 0.000 description 24
- 238000001723 curing Methods 0.000 description 14
- 239000004642 Polyimide Substances 0.000 description 5
- 238000000748 compression moulding Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004964 aerogel Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 238000011417 postcuring Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
-
- 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
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3456—Antennas, e.g. radomes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention discloses a forming method of a curved surface slotting type composite material antenna window in the technical field of composite materials, which comprises the following steps: step 1) prepreg preparation; step 2) preparing a die; step 3) blanking; step 4) layering; step 5) die assembly; step 6) curing: the temperature is raised to a set temperature by adopting a stepped heating curing process in a press for curing and forming, each temperature section stays for a set time, a set pressure is applied during the time, and then the composite blank is obtained after demoulding; step 7) post-treatment: putting the composite blank obtained by the solidification process into a high-temperature furnace, raising the temperature to a set temperature by adopting a gradient heating method again, and taking out the composite blank after the composite blank is naturally cooled to room temperature; and 8) machining, wherein the antenna window prepared by the method meets the requirements of high strength and high modulus, smooth appearance, good quality controllability, mass production and the like of products.
Description
Technical Field
The invention relates to the technical field of composite materials, in particular to a forming method of a composite material antenna window.
Background
The radome is an important component of an aircraft radar system, is used for protecting a radar antenna or the whole microwave system from working normally in a severe environment, and is a pneumatic/structural/wave-transparent function integrated component. The antenna window is generally flat and is positioned at the side of the aircraft, which not only requires reducing the influence of the dielectric material on the electromagnetic wave signal receiving and reflecting, but also has the functions of heat prevention, bearing, flow guiding, weather resistance and the like.
The quartz fiber reinforced polyimide composite material has the characteristics of high specific strength, high specific modulus, high temperature resistance, good wave permeability and the like, and is one of the common materials of the wave-transmitting component of the radar antenna at present. The back of the antenna window body is generally designed with a wave-transmitting window area for bonding aerogel to further improve the heat insulation performance of the product, and aiming at the window area, when the mold is designed, a corresponding boss structure is usually designed on the mold, so that the finally pressed product is provided with window grooves, as shown in fig. 4-5, however, bridging of prepreg at the R angle of the boss is often generated in the production and pressing process, prepreg fibers paved around the boss are scattered, and the like, and finally, the situation that the wave-transmitting window of the antenna window product is in material shortage and layering is finally caused. In addition, the conventional antenna window can only resist instantaneous high temperature, and the problems of bulge and layering easily occur in a long-time high-temperature environment.
In conclusion, research and optimization are performed from aspects of a forming die, a resin curing process system, a forming process design and the like, and the method has profound significance for improving indexes such as apparent performance, temperature resistance, size controllability and the like of the antenna window. A method for forming a window of a quartz reinforced polyimide composite antenna with a window is provided.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a method for forming a curved surface slotting type composite material antenna window, which meets the requirements of high strength and high modulus, smooth appearance, good quality controllability, mass production and the like of products.
The purpose of the invention is realized in the following way: a forming method of a curved surface slotting type composite material antenna window comprises the following steps:
step 1) preparation of prepreg: weighing a certain amount of resin solution according to the designed mass ratio of the resin to the fiber, and uniformly brushing the resin solution on quartz cloth; then removing most of the solvent from the prepreg in the room temperature and high temperature environment, and ensuring that the solvent content of the final prepreg is less than 5%;
step 2) preparation of a die: cleaning the surface of the die, and treating the surface of the die with a release agent for later use;
and 3) blanking: cutting the T-shaped prepreg sheet required by the whole layer by using an automatic cloth cutting machine, and putting the cut material into a standby mould for flattening;
step 4) layering: counting the number of the material sheets, arranging the material sheets, and paving the material sheets in a lower die after ensuring that the material sheets are not wrinkled and deformed, wherein the paving surface of the lower die is smooth;
and 5) die assembly: the front surface of the upper die faces downwards, the front surface of the upper die is also a smooth surface, the upper die is assembled with the lower die along the guide post, a gasket is placed between the upper die and the lower die, then the die is placed in the center of a working table of a press, and then the die is closed;
step 6) curing: the temperature is raised to a set temperature by adopting a stepped heating curing process in a press for curing and forming, each temperature section stays for a set time, a set pressure is applied during the time, and then the composite blank is obtained after demoulding;
step 7) post-treatment: putting the composite blank obtained by the solidification process into a high-temperature furnace, raising the temperature to a set temperature by adopting a gradient heating method again, and taking out the composite blank after the composite blank is naturally cooled to room temperature;
step 8) machining: and after the curing is finished, adding the composite blank to the preset size by using a lathe to the composite blank window, the outer edge and the hole-nesting machine, and finally obtaining the curved surface slotting type composite antenna window.
As a preferable technical scheme of the forming method of the curved surface slotting type composite antenna window, the preparation of the prepreg in the step 1) specifically comprises the following steps:
step 1-1), paving a layer of kraft paper on a workbench, then paving cut quartz fiber cloth on the kraft paper, ensuring that the quartz fiber cloth is flat and has no wrinkles, and then clamping four corners by using a clamp;
step 1-2) heating the reinforced polyimide resin solution at 40-50 ℃ for more than 30 minutes;
step 1-3) according to the mass ratio of fiber to resin of 8:10, weighing resin solution, pouring the resin solution on cut quartz fiber cloth for 2-3 times, uniformly brushing the solution on the cloth by using a scraping plate, wherein each part of solution is brushed for 5 minutes at intervals, standing for 10 minutes after all brushing is finished, standing for 12 hours at room temperature until the surface resin is solidified, covering an isolating film, and volatilizing the solvent;
step 1-4) putting the prepreg into an oven, drying at 120 ℃ for 7 hours, weighing after cooling, if the solvent content exceeds 5%, putting the prepreg into the oven again, drying at 100 ℃ for half an hour, and the like.
As a preferable technical scheme of the forming method of the curved surface slotting type composite antenna window, the step 2) of preparing a die specifically comprises the following steps: and cleaning the disassembled die surface by using acetone, treating the die surface by using a release agent for more than 3 times, wherein each time is separated by 20 minutes, the die adopts a female die, and the groove of the female die is T-shaped.
As the preferable technical scheme of the forming method of the curved surface slotting type composite antenna window, in the step 4), when the layer is paved, the lower edge of the horizontal part of the T-shaped prepreg sheet is kept to be attached to a die, and gaps are reserved between the top edge and the bottom edge of the T-shaped prepreg sheet and the die.
As a preferable technical scheme of the forming method of the curved surface slotting type composite antenna window, the step 6) curing specifically comprises the following steps:
step 6-1), heating the die to 305+/-5 ℃ and preserving heat for 1 hour, observing the resin flowing out of the die, dipping the solution with iron wires, and enabling a wiredrawing state to appear;
step 6-2) taking out the gasket between the upper die and the lower die, pressurizing to 10Mpa, and continuing to keep the temperature for 1 hour;
step 6-3), heating to 370+/-5 ℃ and preserving heat for 2.5 hours;
step 6-4), heating to 380+/-5 ℃ and preserving heat for 2 hours;
step 6-5), maintaining the pressure to be reduced to below 150 ℃ and releasing pressure;
and 6-6) cooling to below 60 ℃ and demoulding to obtain the composite blank.
As a preferable technical scheme of the forming method of the curved surface slotting type composite antenna window, the post-treatment of the step 7) specifically comprises the following steps:
step 7-1), putting the composite blank into a high-temperature furnace, and heating to 300 ℃ at room temperature for 30 minutes;
step 7-2), heating to 350+/-5 ℃ and preserving heat for 30 minutes;
step 7-3), heating to 380+/-5 ℃ and preserving heat for 2 hours;
step 7-4), heating to 400+/-5 ℃ and preserving heat for 1 hour;
step 7-5), heating to 410+/-5 ℃ and preserving heat for 1 hour;
and 7-6) naturally cooling to room temperature and taking out.
Compared with the prior art, the invention has the beneficial effects that:
the antenna window is made of quartz fiber/reinforced polyimide composite material, has high strength and high modulus, can resist high temperature of 450 ℃, and has light weight and good wave permeability; the antenna window adopts a compression molding mode, the size and radian of the product are ensured by a die cavity, the dimensional accuracy is high, the curing temperature of polyimide resin can be adapted, and the mass production is adapted; after the solidification is finished, the heat treatment is continuously carried out on the workpiece, the solidification degree of the resin is improved, and the temperature resistance of the material is further improved; the method has the advantages that through the integral forming and post-machining grooving modes, layering and material shortage conditions at a window caused by factors such as bridging at an R angle of a product, scattering of fibers under high pressure and the like due to the fact that a boss exists in a forming die in the pressing process of the prepreg are avoided, and the apparent flatness and dimensional structure stability of a blank are ensured; the material and the process of the invention can make the manufactured antenna window mechanically grooved on the premise of not affecting the product performance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of the invention.
FIG. 2 is a schematic view of a partial lay-up of a lay-up according to the present invention.
Fig. 3 is a photograph of an antenna window made according to the present invention.
Fig. 4 is a photograph of an antenna window made in the prior art.
Fig. 5 is a photograph of another antenna window made in the prior art.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The forming method of the curved surface slotting type composite material antenna window shown in fig. 1 comprises the following steps:
step 1) preparation of prepreg:
step 1-1), paving a layer of kraft paper on a workbench, then paving cut quartz fiber cloth on the paper, ensuring that the quartz fiber cloth is flat and has no wrinkles, and then clamping four corners by using a clamp;
step 1-2) heating the resin solution at 40-50 ℃ for more than 30 minutes, improving the fluidity of the resin, and facilitating brushing;
step 1-3) according to the mass ratio of the fiber to the pure resin of 8:10, weighing resin solution, pouring the resin solution on cut quartz fiber cloth for 2-3 times, uniformly brushing the solution on the cloth by using a scraping plate, wherein each part of solution is brushed for five minutes, standing for 10 minutes after all brushing is finished, standing for 12 hours at room temperature until the surface resin is solidified, covering an isolating film, and volatilizing the solvent;
step 1-4) putting the prepreg into an oven, drying at 120 ℃ for 7 hours, weighing after cooling, if the solvent content exceeds 5%, putting the prepreg into the oven again, drying at 100 ℃ for half an hour, and the like.
On the premise of meeting the performance requirement of the prepreg, the process method for manually brushing the prepreg is more suitable for developing medium-batch and small-batch composite products. The technological process of the stage has the advantages of variable technological parameters and less consumption, so that the technological process is not only convenient for the technological test stage and timely regulation and control of the resin content, but also can save the production and preparation period to a great extent, reduce the resin waste in the conventional prepreg preparation process and the like, and further reduce the prepreg preparation cost.
Step 2) preparation of a die: the disassembled mold and insert surfaces were cleaned using acetone, the mold surfaces were treated with a release agent for more than 3 times, each time spaced for 20 minutes, and then the lower mold insert was assembled in the lower mold frame.
And 3) blanking: cutting the prepreg sheet required by layering by using an automatic cloth cutting machine, and putting the prepreg sheet into a standby die for flattening.
Step 4) layering: counting the number of the material sheets, arranging the material sheets, paving the material sheets in a lower die after the material sheets are ensured to be deformed without wrinkles, and keeping the lower edges of the horizontal parts of the T-shaped prepreg sheets attached to the die during paving, and controlling gaps between the top edges and the bottom edges of the T-shaped prepreg sheets and the die; the method comprises the following steps: note that the prepreg sheet "shoulder" aligns with the lower mold "shoulder" preventing dimensional deviations, as shown in fig. 2.
When the material sheet is cut, broken fibers and messy fibers inevitably appear at the periphery of the material sheet, so that the size of the material sheet is larger than the net size of the product, and the margin area of the edge can be cut off at the later stage so as to ensure the quality of the final product. The laying mode can ensure that the material sheet is positioned at the middle position in the die, so that the fiber disorder area formed by high-pressure impact is in the allowance area in the curing process. Otherwise, if the upper boundary or the lower boundary of the material sheet and the die is opposite to the material sheet, part of the fiber disorder area appears on the product, so that the mechanical property and the surface quality of the product are affected.
And 5) die assembly: the front surface of the upper die faces downwards, and the upper die is assembled with the lower die along the guide post, so that the edge of the upper die is required to be knocked diagonally in the process, the level of the upper die is ensured, and the gap between the upper die and the lower die is prevented from being generated so as to influence the thickness of a product; the die is arranged at the center of a working table of the press, and a copper gasket with the thickness of 5mm is arranged between the upper die and the lower die, so that gas is discharged in the resin reaction process conveniently, and then the press is operated to carry out die assembly.
Step 6) curing:
step 6-1), heating the die to 305+/-5 ℃ and preserving heat for 1 hour, observing the resin flowing out of the die, dipping the solution with iron wires, and enabling a wiredrawing state to appear;
step 6-2), taking out a cushion block between the upper die and the lower die, pressurizing to 10Mpa, and continuing to keep the temperature for 1 hour;
step 6-3), heating to 370+/-5 ℃ and preserving heat for 2.5 hours;
step 6-4), heating to 380+/-5 ℃ and preserving heat for 2 hours;
step 6-5), maintaining the pressure to be reduced to below 150 ℃ and releasing pressure;
and 6-6) cooling to below 60 ℃ and demoulding to obtain the composite blank.
The process can ensure that the product has good surface quality and is free from buckling deformation, and if the product is demolded after being cooled, the molded surface of the product can be influenced, and meanwhile, the difficulty is increased in ensuring the machine-added size of the product at the later stage.
Step 7) post-treatment:
step 7-1), placing the workpiece obtained by the curing process into a high-temperature furnace;
step 7-2), raising the temperature to 300+/-5 ℃ at room temperature, and preserving the heat for 30 minutes;
step 7-3), heating to 350+/-5 ℃ and preserving heat for 30 minutes;
step 7-4), heating to 380+/-5 ℃ and preserving heat for 2 hours;
step 7-5), heating to 400+/-5 ℃ and preserving heat for 1 hour;
step 7-6), heating to 410+/-5 ℃ and preserving heat for 1 hour;
and 7-7) naturally cooling to room temperature and taking out.
The post-curing process can improve the curing reaction degree of the resin, increase the crosslinking density, improve the thermodynamic performance of the product, remove the residual volatile matters of the workpiece, eliminate the internal stress, reduce the deformation of the product, and avoid the layering condition and the warping deformation condition of the molded surface of the product in the post-machining process to a certain extent.
Step 8) machining: and after the solidification is finished, the workpiece is mechanically added to the drawing size by using a lathe to a composite blank window (shown in figure 2), an outer edge, a nest hole and the like, and finally the curved surface slotting type quartz reinforced polyimide composite antenna window is obtained.
As shown in FIG. 3, compared with the original antenna window, the antenna window has the advantages that the edges of the grooved positions on the inner surface of the antenna window are neat and smooth, no mess fiber and short fiber are arranged around the window, and the problems of bridging, material shortage, layering and the like are also avoided at the inner R angle of the grooved region. Meanwhile, as the milling cutter is added, the position of the slotting area has certain roughness, the heat insulation material can be directly bonded in the later period, and a drill bit is not required to be used for scribing the window position so as to improve bonding firmness, so that mechanical loss of products caused by scribing is avoided to a certain extent.
According to the invention, the quartz fiber/polyimide prepreg is self-made in a manual pasting mode, so that the resin content of the prepreg can be conveniently regulated and controlled.
The invention adopts high-temperature compression molding, effectively improves the surface flatness and the dimensional accuracy, and can meet the high-temperature curing temperature of polyimide resin and mass production of products.
The product obtained by the curing method can not soften, crack, bulge and the like in a short time at the temperature of 450 ℃.
The invention further improves the curing degree of the resin, and post-processes the structural component, so that the product does not soften, crack, bulge and the like at the temperature of 450 ℃ (30 min), and the temperature resistance of the product is optimized.
The invention adopts the mode of integral compression molding and post machining grooving, avoids layering and material shortage caused by factors such as bridging, fiber being scattered and the like generated at the corner of the boss R in the pressing process of the prepreg by using the molding die with the boss, and ensures the apparent flatness and stable dimensional structure of the blank.
The above description of the embodiments is only for aiding in the understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (6)
1. The forming method of the curved surface slotting type composite material antenna window is characterized by comprising the following steps of:
step 1) preparation of prepreg: weighing a certain amount of resin solution according to the designed mass ratio of the resin to the fiber, and uniformly brushing the resin solution on quartz cloth; then removing most of the solvent from the prepreg in the room temperature and high temperature environment, and ensuring that the solvent content of the final prepreg is less than 5%;
step 2) preparation of a die: cleaning the surface of the die, and treating the surface of the die with a release agent for later use;
and 3) blanking: cutting the T-shaped prepreg sheet required by the whole layer by using an automatic cloth cutting machine, and putting the cut material into a standby mould for flattening;
step 4) layering: counting the number of the material sheets, arranging the material sheets, and paving the material sheets in a lower die after ensuring that the material sheets are not wrinkled and deformed, wherein the paving surface of the lower die is smooth;
and 5) die assembly: the front surface of the upper die faces downwards, the front surface of the upper die is also a smooth surface, the upper die is assembled with the lower die along the guide post, a gasket is placed between the upper die and the lower die, then the die is placed in the center of a working table of a press, and then the die is closed;
step 6) curing: the temperature is raised to a set temperature by adopting a stepped heating curing process in a press for curing and forming, each temperature section stays for a set time, a set pressure is applied during the time, and then the composite blank is obtained after demoulding;
step 7) post-treatment: putting the composite blank obtained by the solidification process into a high-temperature furnace, raising the temperature to a set temperature by adopting a gradient heating method again, and taking out the composite blank after the composite blank is naturally cooled to room temperature;
step 8) machining: and after the curing is finished, adding the composite blank to the preset size by using a lathe to the composite blank window, the outer edge and the hole-nesting machine, and finally obtaining the curved surface slotting type composite antenna window.
2. The method for forming a curved surface slotting type composite antenna window according to claim 1, wherein the prepreg manufacturing in the step 1) specifically comprises the following steps:
step 1-1), paving a layer of kraft paper on a workbench, then paving cut quartz fiber cloth on the kraft paper, ensuring that the quartz fiber cloth is flat and has no wrinkles, and then clamping four corners by using a clamp;
step 1-2) heating the reinforced polyimide resin solution at 40-50 ℃ for more than 30 minutes;
step 1-3) according to the mass ratio of fiber to resin of 8:10, weighing resin solution, pouring the resin solution on cut quartz fiber cloth for 2-3 times, uniformly brushing the solution on the cloth by using a scraping plate, wherein each part of solution is brushed for 5 minutes at intervals, standing for 10 minutes after all brushing is finished, standing for 12 hours at room temperature until the surface resin is solidified, covering an isolating film, and volatilizing the solvent;
step 1-4) putting the prepreg into an oven, drying at 120 ℃ for 7 hours, weighing after cooling, if the solvent content exceeds 5%, putting the prepreg into the oven again, drying at 100 ℃ for half an hour, and the like.
3. The method for forming a curved surface slot type composite material antenna window according to claim 1 or 2, wherein the step 2) of preparing the mold specifically comprises: and cleaning the disassembled die surface by using acetone, treating the die surface by using a release agent for more than 3 times, wherein each time is separated by 20 minutes, the die adopts a female die, and the groove of the female die is T-shaped.
4. The method for forming a curved surface slotting type composite antenna window according to claim 1 or 2, wherein in the step 4), the lower horizontal edge of the T-shaped prepreg sheet is kept attached to the mold, and gaps are reserved between the top edge and the bottom edge of the T-shaped prepreg sheet and the mold.
5. The method for forming a curved slotted composite antenna window as defined in claim 1 or 2, wherein step 6) curing specifically comprises:
step 6-1), heating the die to 305+/-5 ℃ and preserving heat for 1 hour, observing the resin flowing out of the die, dipping the solution with iron wires, and enabling a wiredrawing state to appear;
step 6-2) taking out the gasket between the upper die and the lower die, pressurizing to 10Mpa, and continuing to keep the temperature for 1 hour;
step 6-3), heating to 370+/-5 ℃ and preserving heat for 2.5 hours;
step 6-4), heating to 380+/-5 ℃ and preserving heat for 2 hours;
step 6-5), maintaining the pressure to be reduced to below 150 ℃ and releasing pressure;
and 6-6) cooling to below 60 ℃ and demoulding to obtain the composite blank.
6. The method for forming a curved surface slotting type composite antenna window according to claim 1 or 2, wherein the post-treatment of step 7) specifically comprises:
step 7-1), putting the composite blank into a high-temperature furnace, and heating to 300 ℃ at room temperature for 30 minutes;
step 7-2), heating to 350+/-5 ℃ and preserving heat for 30 minutes;
step 7-3), heating to 380+/-5 ℃ and preserving heat for 2 hours;
step 7-4), heating to 400+/-5 ℃ and preserving heat for 1 hour;
step 7-5), heating to 410+/-5 ℃ and preserving heat for 1 hour;
and 7-6) naturally cooling to room temperature and taking out.
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| CN117021614A (en) * | 2023-10-10 | 2023-11-10 | 河北安泰富源安全设备制造有限公司 | Forming method of protective shell for observation window |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117021614A (en) * | 2023-10-10 | 2023-11-10 | 河北安泰富源安全设备制造有限公司 | Forming method of protective shell for observation window |
| CN117021614B (en) * | 2023-10-10 | 2023-12-15 | 河北安泰富源安全设备制造有限公司 | Forming method of protective shell for observation window |
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