CN114986935A - Forming method of sandwich prefabricated resin-based radome - Google Patents
Forming method of sandwich prefabricated resin-based radome Download PDFInfo
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- CN114986935A CN114986935A CN202210600265.XA CN202210600265A CN114986935A CN 114986935 A CN114986935 A CN 114986935A CN 202210600265 A CN202210600265 A CN 202210600265A CN 114986935 A CN114986935 A CN 114986935A
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- Prior art keywords
- foam
- resin
- radome
- honeycomb
- molding
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/02—Making preforms by dividing preformed material, e.g. sheets, rods
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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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Details Of Aerials (AREA)
Abstract
The invention discloses a molding method of a sandwich prefabricated resin-based radome, and belongs to the field of radomes. According to the invention, the foam or honeycomb plate is partitioned according to the structure of the radome, then the foam or honeycomb unit is subjected to hot press molding to form a foam or honeycomb prefabricated body unit, after the foam or honeycomb prefabricated body unit is prepared, the upper surface and the lower surface are fixed with the reinforcing fibers, and then the wave-transmitting resin is used for pouring, curing and molding, so that the shape of the radome is ensured by the foam or honeycomb prefabricated body, and especially the conformal shape of the radome with a complex shape can be ensured. Wave-transparent resin is used for connecting the core layer and the reinforcing fibers in the curing process, and the resin content and the uniformity are ensured by the gaps of the die, so that the overall quality of the radome is ensured. The method is adopted for forming the large-volume antenna housing, and generally, the time for curing the laying layer is only 1-2 days, so that the working time is greatly shortened; meanwhile, the reinforced fiber cloth and the wave-transmitting resin are used for replacing glass fiber prepreg, so that the cost of raw materials is greatly reduced.
Description
Technical Field
The invention belongs to the field of radar antenna covers, and particularly relates to a method for molding a resin-based antenna cover with a sandwich prefabricated body, which is particularly suitable for molding the antenna cover with a complex shape, high cost requirement control and large volume.
Background
The antenna housing is a key component on the radar system and is used for ensuring that the antenna system in the housing normally works under various working conditions. The radome not only needs to have good electrical performance in an antenna working frequency band, but also needs to have the functions of bearing, impact resistance, heat insulation, rain erosion resistance and the like.
In order to improve the anti-interference capability and the guidance precision, the guidance technology develops towards the direction of millimeter wave guidance, and in a millimeter wave band, calculation is carried out according to a Fabry-Perot formula, and the wall thickness of the used antenna housing is thinner and thinner, and some antenna housings are even smaller than 1 mm. And the interlayer radome is most widely applied to the A interlayer radome and the C interlayer radome. The existing interlayer radome is generally formed by paving a glass fiber prepreg on a honeycomb or foam and then curing the glass fiber prepreg in an oven/autoclave. The layer spreading efficiency is low, several days are needed for forming a radome with a large volume, and the prepreg cost is high, so that the radome cost is high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for molding a resin-based radome with a sandwich prefabricated body.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a molding method of a sandwich prefabricated resin-based radome comprises the following steps:
101, cutting foam plates or honeycomb plates in blocks according to an antenna housing structure to obtain a plurality of foam units or honeycomb units;
102, laying the foam units or the honeycomb units on a mold, and carrying out hot-press molding on the foam units or the honeycomb units on the mold to obtain foam or honeycomb prefabricated body units fitting the shape of the mold;
103, laying a plurality of layers of reinforced fiber cloth on a lower die of a forming die, laying foam or honeycomb prefabricated body units on the lower die of the forming die in blocks, then laying a plurality of layers of reinforced fiber cloth on the foam or honeycomb prefabricated body units, fixing the plurality of layers of reinforced fiber cloth and the upper and lower surfaces of the foam or honeycomb prefabricated body units by using glue spraying, closing the upper die and the lower die of the forming die, and then pouring wave-transparent resin between the upper die and the lower die through a glue injection port and curing;
and 104, demolding to obtain the radome blank.
Further, step 104 is followed by:
and 105, polishing the inner surface and the outer surface of the radome blank, and adhering the solidified flange surface to the radome blank to obtain the radome.
Furthermore, the flange surface is molded by adopting leading-in glass fiber cloth or by adopting glass fiber prepreg to spread and adhere and solidify.
Further: step 102 further comprises the steps of paving adhesive films on the upper surface and the lower surface of the foam or honeycomb prefabricated body unit, and fixing the adhesive films on the surface of the foam or honeycomb prefabricated body unit through curing.
Further, in step 103, the wave-transmitting resin is polydicyclopentadiene resin.
Further, in step 103, the perfusion and curing conditions of the wave-transparent resin are as follows:
when the wave-transmitting resin is poured, the temperature of the die is 30-45 ℃;
and (3) when the pouring is finished and the curing is carried out, keeping the temperature of 40-80 ℃ for 24-48h, and finishing the curing.
Furthermore, in step 101, the foam board is made of polymethacrylimide foam; the honeycomb plate is made of aramid paper honeycomb.
Further, the multi-layer reinforced fiber cloth in step 103 is glass fiber cloth or ultra-high molecular weight polyethylene fiber cloth or electronic cloth.
Further, an upper die and a lower die of the forming die are fixed through positioning pins or magnets, a sealing groove is paved on the lower die of the forming die, and a sealing strip is arranged in the sealing groove.
Further: and a glue outlet is arranged on the forming die opposite to the glue injection port.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a molding method of a sandwich prefabricated resin-based radome, which comprises the steps of partitioning a foam or honeycomb plate according to the structure of the radome, carrying out hot press molding on the foam or honeycomb unit to form a foam or honeycomb prefabricated body unit, fixing reinforcing fibers on the upper surface and the lower surface after the foam or honeycomb prefabricated body unit is prepared, and then pouring and curing molding by using wave-transmitting resin, wherein the foam or honeycomb prefabricated body ensures the shape of the radome, and particularly ensures the shape following of radomes with complex shapes. Wave-transparent resin is used for connecting the core layer and the reinforcing fibers in the curing process, the gaps of the upper die and the lower die guarantee the consistent thickness of the product, and after the volume of the prefabricated body is subtracted, the resin content can be accurately determined. The gaps can be completely filled by pouring, curing and forming, and the uniformity of resin is ensured, so that the overall quality of the radome is ensured. The method is adopted to mold the large-volume antenna housing, only 1-2 days are needed, and the working hours are greatly shortened; meanwhile, the reinforced fiber cloth and the wave-transmitting resin are used for replacing glass fiber prepreg, so that the cost of raw materials is greatly reduced. On the basis of meeting the electrical performance and the mechanical performance, the manufacturing cost of the large-volume antenna housing is greatly reduced.
Drawings
FIG. 1 is a flow chart of an embodiment.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, fig. 1 is a flowchart of an embodiment, and a molding method of a resin-based radome with a sandwich preform includes the following steps:
step 101, designing according to the shape of an antenna housing, and cutting a NOMAX paper honeycomb core layer to obtain a plurality of core layer units;
102, after the core layer unit and the load adhesive film are adhered, paving and adhering on an upper die of a forming die, adjusting the core layer unit to be completely adhered to the die, and then heating and forming to obtain a prefabricated body unit;
103, fixing a layer of glass fiber cloth on the upper surface and the lower surface of the prefabricated unit by using spray glue, closing the upper die and the lower die, and injecting wave-transmitting resin after leak detection and sealing are not problematic;
wherein the wave-transmitting resin is poly-dicyclopentadiene resin;
104, raising the temperature of the whole mould to 40 ℃, and demoulding after heat preservation for 24 hours to obtain an antenna housing blank;
and 105, polishing the inner surface and the outer surface of the radome body, manually pasting/vacuum introducing the glass fiber cloth molding flange surface, or paving and curing the glass fiber prepreg on the molding flange surface, and bonding the glass fiber prepreg with the radome body to obtain the radome.
The above contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention should not be limited thereby, and any modification made on the basis of the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A molding method of a resin-based antenna housing with a sandwich prefabricated body is characterized by comprising the following steps:
101, cutting foam plates or honeycomb plates in blocks according to an antenna housing structure to obtain a plurality of foam units or honeycomb units;
102, laying the foam units or the honeycomb units on a mold, and carrying out hot-press molding on the foam units or the honeycomb units on the mold to obtain foam or honeycomb prefabricated body units fitting the shape of the mold;
103, laying a plurality of layers of reinforced fiber cloth on a lower die of a forming die, laying foam or honeycomb prefabricated body units on the lower die of the forming die in blocks, then laying a plurality of layers of reinforced fiber cloth on the foam or honeycomb prefabricated body units, fixing the plurality of layers of reinforced fiber cloth and the upper and lower surfaces of the foam or honeycomb prefabricated body units by glue spraying, closing the upper die and the lower die of the forming die, and then pouring wave-transparent resin between the upper die and the lower die through a glue injection port and curing;
and 104, demolding to obtain the radome blank.
2. The method for molding the resin-based radome with the sandwich preform according to claim 1, wherein the step 104 is followed by further comprising:
and 105, polishing the inner surface and the outer surface of the radome blank, and adhering the solidified flange surface to the radome blank to obtain the radome.
3. The method for molding the resin-based radome with the sandwich preform as claimed in claim 2, wherein the flange surface is molded by vacuum introduction of glass fiber cloth or by paving and curing of glass fiber prepreg.
4. The molding method of the resin-based radome with the sandwich preform as claimed in claim 1, wherein the method comprises the following steps: step 102 further comprises the steps of paving adhesive films on the upper surface and the lower surface of the foam or honeycomb prefabricated body unit, and fixing the adhesive films on the surface of the foam or honeycomb prefabricated body unit through curing.
5. The method for molding the resin-based radome with the sandwich preform as claimed in claim 1, wherein the wave-transparent resin in step 103 is polydicyclopentadiene resin.
6. The method for molding the resin-based radome with the sandwich preform according to claim 1, wherein the conditions for infusing and curing the wave-transparent resin in the step 103 are as follows:
when the wave-transmitting resin is poured, the temperature of the die is 30-45 ℃;
and (3) when the pouring is finished and the curing is carried out, keeping the temperature of 40-80 ℃ for 24-48h, and finishing the curing.
7. The method for molding the resin-based radome of the sandwich preform according to claim 1, wherein the foam board is made of polymethacrylimide foam in step 101; the honeycomb plate is made of aramid paper honeycomb.
8. The method for molding the resin-based radome of the sandwich preform according to claim 1, wherein the plurality of layers of reinforcement fiber cloth in the step 103 are glass fiber cloth or ultra-high molecular weight polyethylene fiber cloth or electronic cloth.
9. The method for molding the resin-based radome of the sandwich preform according to claim 1, wherein upper and lower molds of the molding mold are fixed by positioning pins or magnets, and a sealing groove is formed in the lower mold of the molding mold and is internally provided with a sealing strip.
10. The molding method of the resin-based radome with the sandwich preform as claimed in claim 1, wherein the method comprises the following steps: and a glue outlet is arranged on the forming die opposite to the glue injection port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210600265.XA CN114986935A (en) | 2022-05-30 | 2022-05-30 | Forming method of sandwich prefabricated resin-based radome |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210600265.XA CN114986935A (en) | 2022-05-30 | 2022-05-30 | Forming method of sandwich prefabricated resin-based radome |
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| CN114986935A true CN114986935A (en) | 2022-09-02 |
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| CN202210600265.XA Pending CN114986935A (en) | 2022-05-30 | 2022-05-30 | Forming method of sandwich prefabricated resin-based radome |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110948908A (en) * | 2019-12-06 | 2020-04-03 | 宁波曙翔新材料股份有限公司 | Forming method of resin-based radome with single-layer sandwich foam prefabricated body |
| CN113178694A (en) * | 2021-03-30 | 2021-07-27 | 中国航空制造技术研究院 | Self-adhesive prepreg-containing broadband radome and preparation method thereof |
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2022
- 2022-05-30 CN CN202210600265.XA patent/CN114986935A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110948908A (en) * | 2019-12-06 | 2020-04-03 | 宁波曙翔新材料股份有限公司 | Forming method of resin-based radome with single-layer sandwich foam prefabricated body |
| CN113178694A (en) * | 2021-03-30 | 2021-07-27 | 中国航空制造技术研究院 | Self-adhesive prepreg-containing broadband radome and preparation method thereof |
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