A low-cost ground sandwich type radome plate pre-impregnated material forming method

Abstract

The application provides a low-cost ground-layered antenna radome plate prepreg forming method and belongs to the field of composite material design and manufacturing. The application solves the existing problems in the processing of the ground-layered antenna radome, the mold for manufacturing the antenna radome is reformed, the mold retains the original functions and performances, and the mold is additionally provided with the functions of continuous heating and heat preservation through the reform, the wet hand lay-up process commonly used for the antenna radome is changed into the process form of the prepreg, the female mold of the antenna radome mold and the matched gland are reformed, the mold is provided with the continuous heating capacity, the middle-low temperature curing prepreg with the content of 45%-50% is selected as the reinforcing material, the product can be cured and formed in the mold without moving, and the low-cost prepreg forming of the ground radar antenna radome is realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of composite material design and manufacturing, and particularly relates to a low-cost ground sandwich type radome panel prepreg forming method. BACKGROUND

[0002] The ground sandwich antenna panel is usually large in size, and is usually processed by the manual hand lay-up process which is not limited by size and shape. The process produces a large odor due to open operation, and has certain requirements for the technical level of the operator. Due to the limitation of the hand lay-up process, the resin content of the antenna radome products made by different operators will have certain differences, and due to the existence of such differences, the electrical performance and structural strength of the products may be affected.

[0003] The prepreg can well control the resin content of the fiber, so that the resin content of the fiber is maintained within a certain range, and the produced antenna radome has good uniformity. However, the prepreg forming process will use a large amount of auxiliary materials such as adhesive film, and usually needs a hot press tank for curing. Due to the size limitation of the hot press tank, the size of the product has certain requirements and will produce very high processing cost, which is not suitable for the production of the ground sandwich type radome panel. SUMMARY

[0004] Therefore, in order to solve the problems existing in the processing of the existing ground sandwich type radome mentioned in the background, the present application provides a low-cost ground sandwich type radome panel prepreg forming method. The mold for manufacturing the radome is modified, so that the mold retains the original functions and performances, and has the functions of continuous heating and heat preservation through modification. The wet hand lay-up process commonly used for the radome is changed to the prepreg process form.

[0005] To achieve the above purpose, the present application adopts the following technical scheme: a low-cost ground sandwich type radome panel prepreg forming method, specifically comprising the following steps:

[0006] 1. Material selection: selecting appropriate prepreg raw materials, selecting glass fiber cloth surface density, inner and outer skin layer number, foam density and polyurethane foam thickness;

[0007] 2. Mold making: according to the product blocking condition, the male mold model is made, and after the tire membrane is treated, the female mold and the cover are made by the manual lay-up method,

[0008] The manufacturing process of the female mold is as follows: finding the intersection of each edge of the panel on the tire membrane, leaving a margin outside the contour line as a vacuum sealing area, and then using the manual lay-up method to add the glass fiber composite material reinforcement layer, the heat preservation layer, the high-temperature resistant glass fiber composite material layer, the heat conducting copper pipe and the carbon fiber composite material layer in turn in reverse order,

[0009] The manufacturing process of the cover is: manufacturing on the basis of the already manufactured mold cavity, setting silica gel heating sheet in the middle layer, placing multiple thermocouples and vacuum pump interfaces in different areas as required;

[0010] 3. Panel forming

[0011] ① According to the cloth sample, the prepreg is cut and the foam is corrected and shaped in the cavity;

[0012] ② Confirm the mold state before forming, the mold surface is covered with dewaxing and polished bright without foreign matter;

[0013] ③ Pass heat conducting oil into the mold cavity, the mold temperature is stabilized at 40℃, and the outer skin is laid, a total of 5 layers of prepreg;

[0014] ④ Place the shaped foam core layer on the five layers of laid prepreg;

[0015] ⑤ Lay 5 layers of inner skin and edge rib reinforcement cloth;

[0016] ⑥ Put the cover on the laid inner skin, seal, vacuum shape, vacuum pressure ≤-0.07MPa, power on the silica gel heating sheet 10 to heat the temperature to 90℃ for 20min;

[0017] ⑦ The temperature rising speed is about 5℃ / min, when the temperature is stabilized at 90℃, start recording the curing time, 6h curing is completed, maintain negative pressure during the period;

[0018] ⑧ After curing is completed, naturally cool down, demold when the temperature drops to room temperature, transfer to the next process;

[0019] ⑨ Follow the above process to form the next panel.

[0020] Further, in step 1, the prepreg uses product provided epoxy resin content of 48% glass fiber prepreg, the curing temperature is 90℃, the curing time is ≥6h, the glass fiber cloth surface density is 200g / m 2 , the inner and outer skins are five layers; polyurethane foam with a density of 60kg / m 3 and a thickness of 60mm is used.

[0021] Further, the radome production mold comprises a female mold and a cover mold, the female mold and the cover mold are used in cooperation, the female mold comprises a carbon fiber composite material layer, a heat-conducting copper pipe, a high-temperature-resistant glass fiber composite material layer, a heat preservation layer and a glass fiber composite material reinforcing layer, the female mold is sequentially provided with the carbon fiber composite material layer, the heat-conducting copper pipe, the high-temperature-resistant glass fiber composite material layer, the heat preservation layer and the glass fiber composite material reinforcing layer from inside to outside; the cover comprises a glass fiber composite material layer, a silica gel heating sheet and a second carbon fiber composite material layer, and the glass fiber composite material layer, the silica gel heating sheet and the second carbon fiber composite material layer are sequentially arranged.

[0022] Further, the heat preservation layer is a polymethacrylimide foam.

[0023] Further, the heat-conducting copper pipe is concentrically and equidistantly provided with a plurality of turns.

[0024] Further, the thickness of the carbon fiber composite material layer is 0.6 mm, the thickness of the high-temperature-resistant glass fiber composite material layer is 3 mm, the thickness of the heat preservation layer is 5 mm, and the thickness of the glass fiber composite material reinforcing layer is 3 mm.

[0025] Further, the thickness of the thin glass fiber composite material layer is 0.6 mm, the thickness of the silica gel heating sheet is 1.8 mm, and the thickness of the thin carbon fiber composite material layer is 0.6 mm.

[0026] Further, the cover mold is divided into six regions, two of which are upper and lower regions of the region connected by the four middle vertices, and are triangular, and then the diagonal lines of the region connected by the four middle vertices are cross-connected to form four regions.

[0027] Further, each region of the cover mold is provided with a silica gel heating sheet, and each silica gel heating sheet is provided with a thermocouple, the thermocouple passes through the thin carbon fiber composite material layer of the cover mold, and the temperature inside the cavity is observed in real time.

[0028] Further, the joints of the six regions are filled with body silica gel, and a plurality of vacuum pump interfaces are arranged at the joints, and after material laying and sealing, negative pressure shaping is performed.

[0029] Compared with the prior art, the low-cost ground sandwich type radome plate pre-impregnated material forming method has the following advantages:

[0030] The female mold and the matched cover of the radome mold are modified, so that the mold has a continuous heating capacity, the low-temperature curing pre-impregnated material with a content of 45%-50% is selected as the reinforcing material, the product can be cured and formed without moving in the mold, and the low-cost pre-impregnated material forming of the ground radar radome is realized. Attached Figure Description

[0031] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 This is a cross-sectional view of the antenna radome female mold according to the present invention;

[0033] Figure 2 The diagram shows the arrangement of the conduit according to the present invention, and the mold is an irregular hexagon.

[0034] Figure 3 This is a cross-sectional view of the antenna radome mold cover described in this invention;

[0035] Figure 4 This is a diagram showing the arrangement of the antenna radome mold cover according to the present invention;

[0036] Figure 5 The 3D effect of the female mold of the radome mold described in this invention. Figure 1 ;

[0037] Figure 6 The 3D effect of the female mold of the radome mold described in this invention. Figure 2 ;

[0038] Figure 7 This is a 3D rendering of the antenna radome mold cover described in this invention.

[0039] Figure 8 This is a structural schematic diagram of the radome product;

[0040] Figure 9 This is a schematic diagram of the antenna radome panel structure;

[0041] Figure 10 This is an assembly diagram of the radome mold described in this invention;

[0042] In the diagram: 1-First carbon fiber composite layer, 2-Heat-conducting copper pipe, 3-High-temperature resistant glass fiber composite layer, 4-Insulation layer, 5-Glass fiber composite reinforcement layer, 6-Heat-conducting oil inlet, 7-Sealing area, 8-Heat-conducting oil outlet, 9-Glass fiber composite layer, 10-Silicone heating element, 11-Second carbon fiber composite layer, 12-Sealing area, 13-Vacuum pump interface position, 14-Thermocouple placement position, 15-Upper surface of female mold, 16-Lower surface of female mold, 17-Upper surface of gland, 18-Lower surface of gland, 19-Cover plate, 20-Outer skin, 21-Core layer, 22-Inner skin, 23-Glander, 24-Female mold, 25-Product cavity. Detailed Implementation

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be explained that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only some of the embodiments of the present application, but not all the embodiments.

[0044] I. Specific implementation Figures 1-10 The present embodiment is a low-cost ground sandwich type antenna cover plate preform forming method, which specifically comprises the following steps:

[0045] 1. Material selection: selecting appropriate preform raw materials, selecting glass fiber cloth surface density, inner and outer skin layer number, foam density and polyurethane foam thickness;

[0046] 2. Mould making: according to the product blocking condition, the male mould model is made, after the surface treatment of the mould membrane, the female mould 24 and the pressing cap 23 are made by the manual paste method,

[0047] The manufacturing process of the female mould 24 is as follows: find the intersection of each edge of the plate on the mould membrane, and leave a margin outside the contour line as a vacuum sealing area, then use the manual paste method to add the glass fiber composite material reinforcing layer 5, the heat preservation layer 4, the high temperature resistant glass fiber composite material layer 3, the heat conducting copper pipe 2 and the carbon fiber composite material layer 1 in reverse order,

[0048] The manufacturing process of the pressing cap 23 is as follows: the female mould 24 is made on the basis of the female mould 24 which has been made, the middle layer is provided with a silica gel heating sheet 10, and a plurality of thermocouples and vacuum pump interfaces are placed in different areas according to requirements;

[0049] 3. Plate forming

[0050] ① According to the cloth sample, the preform is cut, and the foam is corrected and shaped in the female mould 24;

[0051] ② Confirm the mould state before forming, the mould surface is covered with dewaxing and polishing bright without foreign matter;

[0052] ③ Put heat conducting oil into the mould 24, and lay the outer skin 20 when the mould temperature is stabilized at 40℃, a total of 5 layers of preform;

[0053] ④ Place the shaped foam core layer 21 on the five layers of laid preform;

[0054] ⑤ Lay 5 layers of inner skin 22 and edge rib reinforcing cloth;

[0055] (6) Put the pressure cover 23 on the laid inner skin 22, seal, vacuum forming, vacuum pressure ≤-0.07MPa, and power on the silica gel heating sheet 10 to heat to 90℃ for 20min;

[0056] (7) The temperature increasing speed is about 5℃ / min, when the temperature is stable at 90℃, start to record the curing time, and the curing is completed in 6h, during which the negative pressure is kept;

[0057] (8) After the curing is completed, naturally cool down, and after the temperature is reduced to room temperature, demoulding is carried out, and then the process is continued;

[0058] (9) The following plate forming is carried out according to the above process.

[0059] The present application selects the fiber prepreg with resin content of 45%-50% and low temperature curing (curing temperature of 80-120℃), and the prepreg does not need to use adhesive film between the prepregs and between the prepreg and the foam due to the high fiber adhesive content. Through the modification of the existing mold, the present application provides a low-cost ground sandwich radome plate prepreg forming method and forming mold.

[0060] The radome production mold comprises a female mold 24 and a pressure cover 23, the female mold 24 and the pressure cover 23 are used in cooperation, the female mold 24 comprises a first carbon fiber composite material layer 1, a heat conducting copper pipe 2, a high temperature resistant glass fiber composite material layer 3, a heat preservation layer 4 and a glass fiber composite material reinforcing layer 5, and the female mold 24 is sequentially provided with the first carbon fiber composite material layer 1, the heat conducting copper pipe 2, the high temperature resistant glass fiber composite material layer 3, the heat preservation layer 4 and the glass fiber composite material reinforcing layer 5 from inside to outside; the pressure cover 23 comprises a glass fiber composite material layer 9, a silica gel heating sheet 10 and a second carbon fiber composite material layer 11, and the glass fiber composite material layer 9, the silica gel heating sheet 10 and the second carbon fiber composite material layer 11 are sequentially arranged. The heat conducting copper pipe 2 is concentrically and equidistantly provided with a plurality of circles.

[0061] The radome production mold comprises two parts of a female mold 24 and a pressure cover 23, and the shape of the sandwich radome plate is given by the mold. The process of forming the ground sandwich radome by using the prepreg of the non-heat pressing tank needs to modify the mold, so that the curing and forming can be completed without moving the mold in the working position after the radome skin and the foam are laid, the moving process is removed, the efficiency is improved, and the labor cost is reduced.

[0062] The radome pressure cover 23 and the female mold 24 are manufactured by the manual paste method, and are modified according to their different functions and characteristics. The female mold 24 needs large rigidity, so that it can be repeatedly used for many times. The radome female mold 24 is newly designed, and the structure is as follows Figure 1As shown: the outermost layer is glass fiber composite reinforcement layer 5, which protects the mold; the insulation layer 4 selects poly (methyl acrylimide) foam (PMI foam) with good temperature resistance, which plays a role in heat preservation and increases the thickness of the structure; next is the high-temperature-resistant glass fiber composite material layer 3, which is composed of high-temperature-resistant epoxy resin and glass fiber cloth, which protects the lower foam layer; then is the heat-conducting copper pipe 2, which is evenly distributed in the mold at a certain interval, and after the heat-conducting oil is poured in, it plays a role in heating; finally, it is a first carbon fiber composite material layer 1, and carbon fiber is a heat-conducting material, which is selected to make the heat more evenly distributed. The bottom of the mold is provided with a through carbon fiber composite material layer hot spot, which can observe the temperature inside the female mold in real time.

[0063] The thickness of the first carbon fiber composite material layer 1 is 0.6mm.

[0064] The thickness of the high-temperature-resistant glass fiber composite material layer 3 is 3mm.

[0065] The thickness of the insulation layer 4 is 5mm.

[0066] The thickness of the glass fiber composite reinforcement layer 5 is 3mm.

[0067] The distribution of the heat-conducting copper pipe 2 in the female mold is shown in Figure 2 The heat-conducting copper pipe 2 adopts a certain diameter of copper pipe, which is arranged regularly at a certain interval according to the specified position and fixed by the stainless steel tape reserved in the carbon fiber composite material layer in advance. In this way, the mold is continuously heated.

[0068] The radome cover 23 is finally covered in the plate processing, which determines the quality of the final inner surface, controls the thickness of the edge rib, requires a certain flexibility, and can completely fit the cavity 25 under the action of negative pressure, so the overall thickness is not too thick, and foam and other materials are not suitable for heat preservation. The use of foam will increase the structural thickness and improve the overall rigidity, so the cover 23 is redesigned, and the structure is as follows Figure 3 As shown: the outermost layer of the cover 23 is the second carbon fiber composite material layer 11, which has the same effect as the first carbon fiber composite material layer 1 of the female mold 24, and makes the heat evenly transmitted to the inside of the mold cavity; the middle layer is a soft and heatable silicone heating sheet 10, which is a heat source and also has good conformability; the outer layer is a thin glass fiber composite material layer 9, which protects the silicone heating sheet.

[0069] The thickness of the glass fiber composite material layer 9 is 0.6mm.

[0070] The thickness of the silica gel heating sheet 10 is 1.8 mm. The technical parameters of the silica gel heating sheet 10 are as follows: maximum temperature resistance of insulating material: 250℃, maximum use temperature: 200℃, insulation resistance: ≥100MΩ, voltage resistance: 2000v / 5s, power deviation: ±8%, rated use voltage: ±5%, maximum length: 6000mm, thinnest thickness: 1.5mm, normal thickness: 1.8mm. The specific production can be made according to the voltage, power and super wide and super long super large specification product shape required by the user.

[0071] The thickness of the second carbon fiber composite material layer 11 is 0.6 mm.

[0072] The cover mold is divided into 6 regions, of which 2 regions are the upper and lower regions of the region after connecting the middle four vertices, and are triangular, and then the diagonal lines of the region after connecting the middle four vertices are connected to form 4 regions.

[0073] Each region of the cover mold is provided with a silica gel heating sheet 10, and each silica gel heating sheet 10 is provided with a thermocouple which penetrates through the thin carbon fiber composite material layer 9 of the cover mold to observe the temperature inside the cavity in real time.

[0074] The joints of the 6 regions are filled with body silica gel, and a plurality of vacuum pump interfaces are arranged at the joints. After the material is laid and sealed, negative pressure is applied for shaping.

[0075] The mold cover arrangement diagram is shown in Figure 4 The middle layer of the region except the sealing area 12 is spliced with the silica gel heating sheet 10, and the joints are filled with body silica gel. The thermocouple is arranged at the black dot area, and the thermocouple penetrates through the second carbon fiber composite material layer 11 of the cover mold to observe the temperature inside the cavity 25 in real time. A plurality of vacuum pump interfaces are arranged at the circular dot positions. After the material is laid and sealed, negative pressure is applied for shaping.

[0076] Example 1:

[0077] This example is a 20-meter-diameter antenna cover product (as shown in Figure 8 The antenna cover is an A sandwich structure, the cut-off sphere height is 16 meters, there are 10 units in total, and there are 201 plate blocks in total. Through electrical performance simulation calculation and structure checking, it is confirmed that the structure form is that the inner and outer skins are both 1mm, and the foam thickness is 60mm.

[0078] The cover plate blocks 19 are randomly distributed: from the perspective of electrical performance, it is required that the unit blocks are uniformly and randomly distributed on the entire spherical surface, so that the influence on electrical performance is reduced to the lowest level. The spherical surface of the antenna cover should follow the randomization principle, so that the seams of the unit blocks are uniformly distributed in all directions in space, and it is ensured that the seams are not repeated in the same direction, that is, there are not more than two parallel seams from a distance.

[0079] 1. Material Selection

[0080] The prepreg uses a fiberglass prepreg with an epoxy resin content of 48% (customized product), provided by the product manufacturer. The curing temperature is 90℃, the curing time is ≥6h, and the fiberglass cloth surface density is 200g / m². 2 Both the inner and outer skins are five-layered; the foam used is supplied by the manufacturer with a density of 60 kg / m³. 3 Polyurethane foam with a thickness of 60mm;

[0081] 2. Mold making

[0082] Production of Female Mold 24: A wooden male mold is made according to the product's segmentation. After surface treatment of the mold base, the female mold 24 is made using a hand-laid method. The basic process involves finding the intersection points of each segment on the mold base, leaving sufficient allowance on the outer edge of the outline for a vacuum sealing area, and then creating a high-temperature resistant gel coat layer (which, after the wooden mold base is formed, is also the top layer of the concave surface of the female mold). Figure 1 The lamination process is performed in reverse order, and each step requires separate curing. The overall thickness of the female mold 24 is approximately 20mm. Note that stainless steel cable ties are pre-embedded in the designated position of the carbon fiber composite layer 1 to fix the heat-conducting copper tube 2. The diameter of the copper tube is 10mm, and the copper spacing has been verified to be 60mm. After the copper tubes are arranged, they are verified using compressed air. After verification, the next step of the fabrication is carried out, and thermocouples are placed in the designated positions as required.

[0083] The cap 23 is made on the basis of the completed mold female mold. During the production process, the cavity (the cavity is the cavity between the female mold and the cap, and the skin and foam are laid in the cavity) is filled with foam. The middle layer of the cap 23 uses a 1.8mm thick silicone heating sheet 10. Multiple thermocouples and vacuum pump interfaces are placed in different areas according to the paper requirements.

[0084] 3. Slab formation

[0085] ① Cut the prepreg according to the fabric sample, and complete the correction and shaping of the foam within the negative mold 24;

[0086] ② Before molding, confirm the condition of the mold. The mold surface is covered with dewax and polished to a bright shine with no foreign matter.

[0087] ③Pour heat transfer oil into the female mold 24. When the mold temperature stabilizes at 40℃, lay out the outer skin 20, a total of 5 layers of prepreg.

[0088] ④ Place the shaped foam core layer 21 on the five layers of prepreg;

[0089] ⑤ Lay 5 layers of inner skin 22 and side rib reinforcing fabric;

[0090] ⑥Press the cover 23 on the laid inner skin 22, seal, and perform vacuum setting (vacuum pressure ≤-0.07 MPa). The silicon heating sheet 10 is powered to heat to 90°C for 20 minutes;

[0091] ⑦The temperature is raised at a speed of about 5°C / min. When the temperature is stabilized at 90°C, the curing time is recorded. The curing is completed in 6 hours. During the curing, the negative pressure is maintained.

[0092] ⑧After the curing is completed, the temperature is naturally lowered. When the temperature is lowered to room temperature, the mold is demolded, and the process is transferred to the next step.

[0093] ⑨The next plate is formed according to the above process.

[0094] The above disclosed embodiments of the present application are only used to help explain the present application. The embodiments do not describe all the details, nor limit the present application to the specific embodiments. According to the content of the present specification, many modifications and changes can be made. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can well understand and utilize the present application.

Claims

1. A low-cost method for molding prepreg of ground-based sandwich radome panels, characterized in that: Specifically, the following steps are included: Step 1, Material Selection: Select suitable prepreg raw materials, set the fiberglass cloth surface density, number of inner and outer skin layers, foam density, and polyurethane foam thickness; Step 2, Mold Making: Based on the product segmentation, a positive mold base model is made. After surface treatment of the base model, the negative mold (24) and the pressure cap (23) are made by hand-laying. The process of making the negative mold (24) is as follows: find the intersection of each side of the plate on the mold, leave a margin outside the outline as a vacuum sealing area, and then lay the glass fiber composite reinforcement layer (5), the heat insulation layer (4), the high temperature resistant glass fiber composite layer (3), the heat-conducting copper pipe (2) and the No. 1 carbon fiber composite layer (1) in reverse order by hand pasting. The manufacturing process of the pressure cap (23) is as follows: it is made on the basis of the already completed female mold (24). The middle layer of the pressure cap (23) is equipped with a silicone heating plate (10), and multiple thermocouples and vacuum pump interfaces are placed in different areas as required. Step 3: Slab Formation ① Cut the prepreg according to the fabric sample, and complete the modification and shaping of the insulation layer (4) foam in the negative mold (24); ② Before molding, confirm the condition of the mold. The mold surface is covered with release wax and polished to a bright finish without any foreign matter. ③ Heat transfer oil is introduced into the female mold (24) of the mold. When the mold temperature is stable at 40℃, the outer skin is laid, with a total of 5 layers of prepreg. ④ Place the shaped foam core layer (21) on the five layers of prepreg; ⑤ Lay 5 layers of inner skin and edge rib reinforcement fabric; ⑥ Place a pressure cap (23) on the laid inner skin (22) to seal it, perform negative pressure shaping, vacuum pressure ≤ -0.07MPa, and heat the silicone heating pad (10) to 90℃ and keep it warm for 20 minutes. ⑦ Heating and curing: The heating rate is 5℃ / min. When the temperature stabilizes at 90℃, start recording the curing time. Curing is completed in 6 hours. Maintain negative pressure during the process. ⑧ After curing, allow the material to cool naturally to room temperature before demolding and proceeding to the next step. ⑨ Proceed with the above process to form the next section; The radome mold includes a female mold (24) and a pressure cap (23), which are used together. The female mold (24) is provided with a first carbon fiber composite material layer (1), a heat-conducting copper pipe (2), a high-temperature resistant glass fiber composite material layer (3), a heat insulation layer (4), and a glass fiber composite material reinforcement layer (5) from the inside to the outside. The pressure cap (23) includes a glass fiber composite material layer (9), a silicone heating element (10), and a second carbon fiber composite material layer (11), which are arranged in sequence. The cover (23) is divided into 6 regions, two of which are the upper and lower regions of the region after the four vertices of the middle are connected, and both are triangles. Then, the diagonals of the region after the four vertices of the middle are connected to form 4 regions.

2. The low-cost ground-based sandwich radome prepreg molding method according to claim 1, characterized in that: In step 1, the prepreg used is a fiberglass prepreg with an epoxy resin content of 48% provided by the product, with a curing temperature of 90℃, a curing time of ≥6h, and a fiberglass cloth surface density of 200g / m². 2 Both the inner and outer skins are five layers thick; they use 60mm thick polyurethane foam with a foam density of 60kg / m³.

3. The low-cost prepreg molding method for ground-based sandwich radome panels according to claim 1, characterized in that: The insulation layer (4) is polymethacrylimide foam.

4. The low-cost ground-based sandwich radome plate prepreg molding method according to claim 1, characterized in that: The heat-conducting copper tube (2) is arranged in several concentric circles at equal intervals.

5. The low-cost ground-based sandwich radome plate prepreg molding method according to claim 1, characterized in that: The thickness of the first carbon fiber composite layer (1) is 0.6 mm; the thickness of the high temperature resistant glass fiber composite layer (3) is 3 mm; the thickness of the insulation layer (4) is 5 mm; and the thickness of the glass fiber composite reinforcement layer (5) is 3 mm.

6. The low-cost ground-based sandwich radome plate prepreg molding method according to claim 5, characterized in that: The glass fiber composite material layer (9) has a thickness of 0.6 mm, the silicone heating element (10) has a thickness of 1.8 mm, and the second carbon fiber composite material layer (11) has a thickness of 0.6 mm.

7. The low-cost ground-based sandwich radome prepreg molding method according to claim 5, characterized in that: Each region of the pressure cap (23) is provided with a silicone heating pad (10), and each silicone heating pad (10) is provided with a thermocouple. The thermocouple is directly connected to the glass fiber composite material layer (9) of the pressure cap (23) to observe the internal temperature of the cavity in real time.

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