A forming die and method for a small opening truncated spherical antenna cover

Abstract

The application relates to a forming die and a preparation method of a small-opening section-spherical antenna cover, and belongs to the field of radar antenna cover processing and manufacturing. The forming die is a combined die composed of upper and lower female dies; the method comprises the following steps: assembling a lower half antenna cover paving tool; paving an outer skin layer, a honeycomb layer and an inner skin layer of the lower half antenna cover; assembling an upper half antenna cover paving tool; paving an outer skin layer, a honeycomb layer, a flange transition layer and an inner skin layer of the upper half antenna cover; combining the upper and lower female dies; curing, forming, demolding and hole making to obtain the antenna cover. Through the forming method of separately paving the split female die and then combining and assembling, the problems that the female die of the small-diameter section-spherical antenna cover is not easy to pave and needs to be formed in split mode, and the male die is not easy to demold during forming are solved; through the combination and matching use of the upper and lower paving rings and the upper and lower female dies, the problem of accurate positioning of the space staggered paving of the antenna cover forming materials such as the inner and outer skins and the honeycomb is solved.

Description

Technical Field

[0001] This invention belongs to the field of radar radome processing and manufacturing, and relates to a molding die and method for a large curvature spherical composite material radar radome, which is used to manufacture a full-surface transparent radar radome with a small opening size and a semi-closed spherical structure. Background Technology

[0002] A radome is a functional structural component that protects the antenna system or the entire microwave system from external damage and destruction. It has functions such as wave transmission, load bearing, impact resistance, heat insulation, and weather resistance.

[0003] Currently, to meet the aerodynamic shape and maintenance / inspection requirements of airborne radar products, these radar radomes are typically designed as semi-enclosed structures with a bottom-opening truncated spherical surface. These radomes suffer from manufacturing drawbacks such as difficulty in integral molding and difficulty in demolding after molding. To achieve manufacturing accessibility for these radomes, two manufacturing processes are commonly used. Existing technology discloses one design and manufacturing process for such radar radomes. This method involves disassembling the radome into three parts: an upper radome, a lower radome, and a front radome. These three parts are individually cured using negative molds and then screwed together to form the radome. Existing technology also discloses another manufacturing process for such radar radomes. In this method, the radome is integrally molded using a positive mold. The molding mold is a combined positive mold, consisting of a central core mold and multiple side molds. After molding, the radome is sequentially demolded to obtain the final radome.

[0004] The above-mentioned radome manufacturing method has the following drawbacks:

[0005] (1) When the radome is formed by split molding and then reassembled, the fasteners at the splicing point and the connection of the laminated solid will affect the electrical indicators such as the transmittance of the radome. This method is only suitable for the processing of radomes that require regional transmittance, and is not suitable for the processing and manufacturing of radomes that require full-area transmittance.

[0006] (2) When using a combined male mold to form an integral radome, in order to achieve demolding of the combined male mold, the minimum size of the opening at the bottom of the radome must be greater than one-third of the diameter of the radome sphere. In addition, the radome formed by this method also has the disadvantage of poor external surface dimensional accuracy, and is not suitable for the processing and manufacturing of radar radomes with small bottom openings and high aerodynamic shape requirements.

[0007] The radar radome of a certain product is a closed structure of a truncated spherical surface with an opening at the bottom. The diameter of the sphere is φ624.2mm, the height is 358.7mm, and the outline dimensions of the bottom opening are 559mm×182mm. The minimum opening size is less than one-third of the diameter of the radome sphere. At the same time, the design requires the radome to be transparent across the entire surface, and the shape tolerance is controlled within ±0.1mm. The existing radome manufacturing methods are no longer suitable for the processing and manufacturing of semi-closed spherical radar radomes with small opening size and full surface transparency. Summary of the Invention

[0008] The technical problem to be solved by this invention is:

[0009] To overcome the shortcomings of existing methods for fabricating truncated spherical radar radomes, a co-curing method for fabricating small-aperture, semi-enclosed spherical radar radomes was developed. This method involves separately laying out the female molds and then assembling them together, as well as using an overall layering method with alternating spatial laying of the inner and outer skins. This solves the problems of difficulty in laying out the female mold during the fabrication of small-aperture truncated spherical radar radomes and the inability to demold the mold during the fabrication of the male mold. This method achieves high-precision, integral fabrication of small-aperture, truncated spherical radar radomes.

[0010] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0011] A molding die for a small-aperture truncated spherical radome, wherein the radome is divided into a lower half and an upper half according to its maximum shape, wherein the lower half of the radome has a paper honeycomb sandwich structure, the top opening flange of the upper half of the radome has a laminated plate structure, and the remaining part has a paper honeycomb sandwich structure; the molding die is characterized by being a combined female mold structure, including a lower female mold, a lower bonding ring, an upper female mold, and an upper bonding ring;

[0012] The outer surface of the lower half of the female mold is cylindrical, and the inner cavity shape is consistent with the geometry of the lower half of the radome; the outer surface of the upper half of the female mold is cylindrical, and the inner cavity shape is consistent with the geometry of the upper half of the radome; the lower half of the female mold and the upper half of the female mold, when combined, can enclose the radome.

[0013] The lower and upper mounting rings are spherical structures. The lower mounting ring and the lower half-cabin mold cooperate to form a lower half-antenna radome mounting fixture; the upper mounting ring and the upper half-cabin mold cooperate to form an upper half-antenna radome mounting fixture.

[0014] A further technical solution of the present invention: the radius of the cylindrical surface structure of the lower and upper half-molds is 40mm larger than the radius of the maximum outer shape of the antenna radome.

[0015] A further technical solution of the present invention: the mounting surface of the lower half of the female mold is provided with a positioning guide post and a threaded hole, and the positioning guide post is used for the combined positioning of the lower half of the female mold and the upper half of the female mold.

[0016] A further technical solution of the present invention: the positioning guide post has a cylindrical structure with a tapered head.

[0017] A further technical solution of the present invention: the mounting surface of the upper female mold is provided with a blind hole that mates with the positioning guide post and a through hole that mates with the threaded hole.

[0018] A further technical solution of the present invention: the inner surface of the lower laying ring is an upward truncated spherical structure based on the maximum outer shape of the radome, with a cross-sectional height of 60mm. After the lower laying ring and the lower half of the female mold are positioned by positioning guide posts, a lower half of the radome laying fixture is formed.

[0019] A further technical solution of the present invention: the inner surface of the upper mounting ring is a downwardly truncated spherical structure based on the honeycomb inner size at the maximum outer shape of the radome, with a cross-sectional height of 60mm. After the upper mounting ring and the upper half of the female mold are positioned by positioning pins, an upper half of the radome mounting fixture is formed.

[0020] A further technical solution of the present invention: the lower half-mold, the lower laying ring, the upper half-mold, and the upper laying ring are all made of 45 steel.

[0021] A method for forming a small-aperture truncated spherical radome, characterized by the following steps:

[0022] Step 1: After cleaning the lower half-mold, lower laying ring, upper half-mold and upper laying ring, apply release agent to the surface at least twice;

[0023] Step 2: The lower mounting ring and the lower half of the female mold are positioned by positioning guide posts to form the lower half of the antenna cover mounting fixture;

[0024] Step 3: Using the top surface of the lower half-antenna radome installation fixture as the starting point for layering, lay 5 layers of the lower half-antenna radome outer skin in an alternating pattern downwards;

[0025] Step 4: Lay the lower half of the honeycomb layer, aligning the starting line of the lower half of the honeycomb layer with the lower half of the 5th outer skin layer;

[0026] Step 5: Lay 5 layers of the lower half radome inner skin downwards in an alternating pattern, aligning the start line of the lower half radome inner skin with the lower half honeycomb layer;

[0027] Step 6: Remove the lower liner from the lower half of the mold;

[0028] Step 7: The upper mounting ring and the upper half of the female mold are positioned by positioning pins to form the upper half of the antenna cover mounting fixture;

[0029] Step 8: Starting from 60mm below the parting surface of the upper half of the mold, lay 5 layers of the outer skin of the upper half of the radome in an alternating pattern upwards;

[0030] Step 9: Lay out the honeycomb layer of the upper half of the radome, aligning the start line of the honeycomb layer of the upper half of the radome with the outer skin of the 5th layer of the upper half of the radome.

[0031] Step 10: Lay 8 layers of transition prepreg at the open flange;

[0032] Step 11: Lay 5 layers of the inner skin of the upper half of the radome in an alternating pattern, aligning the start line of the inner skin of the upper half of the radome with the honeycomb layer of the upper half of the radome.

[0033] Step 12: Remove the upper lining ring and positioning pin from the upper half of the female mold;

[0034] Step 13: The upper female mold and the upper female mold are closed together, and after being positioned by the positioning guide post, they are screwed together to form an integral mold;

[0035] Step 14: Make a vacuum bag, cure it in an autoclave, demold it, make holes, and finally obtain the antenna radome.

[0036] A further technical solution of the present invention: the stagger distance between each layer of skin is 15mm, and the skin includes an outer skin or an inner skin.

[0037] The beneficial effects of this invention are as follows:

[0038] This invention provides a molding die and method for a small-aperture truncated spherical radome. By using a molding method that involves separately laying out the female mold and then assembling the mold, it solves the problems of difficulty in laying out the female mold and the need for separate molding when molding small-aperture, truncated spherical radomes, as well as the difficulty in demolding the mold when molding the male mold. By using upper and lower laying rings in combination with upper and lower female molds, it solves the problem of precise positioning of the spatial staggered laying of radome molding materials such as inner and outer skins and honeycomb, and finally realizes high-precision, co-curing female mold molding preparation of small-aperture, truncated spherical radar radomes. Attached Figure Description

[0039] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0040] Figure 1 Antenna structure diagram: (a) 3D view of the antenna radome; (b) sectional view of the antenna radome.

[0041] Figure 2 Molding mold structure diagram: (c) 3D view of molding mold; (d) sectional view of molding mold.

[0042] Figure 3 Lower half female mold structure diagram: (e) Front view of the lower half female mold; (f) Sectional view of the lower half female mold.

[0043] Figure 4 Upper half female mold structure diagram: (g) Front view of the upper half female mold; (h) Cross-sectional view of the upper half female mold.

[0044] Figure 5 Top and bottom ring structure diagrams: (i) Bottom ring structure diagram; (j) Top ring structure diagram.

[0045] Figure 6 Cross-sectional view of the lower half of the radome.

[0046] Figure 7 Cross-sectional view of the upper half of the radome.

[0047] Figure 8 The radome forming diagrams involved in this invention are: (k) exploded view of the radome forming; (l) cross-sectional view of the radome forming.

[0048] In the diagram, 1-forming mold; 2-radome; 3-maximum outer shape of the radome; 4-lower half of the radome; 5-upper half of the radome; 6-top opening flange of the upper half of the radome; 7-lower half of the female mold; 8-lower bonding ring; 9-upper half of the female mold; 10-upper bonding ring; 11-parting surface of the upper and lower half of the female mold; 12-positioning guide post on the lower half of the female mold; 13-M12 threaded hole on the lower half of the female mold; 14-blind hole on the upper half of the female mold; 15-φ12.5 through hole on the upper half of the female mold; 6-Through hole on the lower mounting ring; 17-Through hole on the upper mounting ring; 18-Positioning pin; 19-Lower half radome mounting fixture; 20-Lower half radome outer skin; 21-Lower half radome honeycomb layer; 22-Fifth layer lower half radome outer skin; 23-Lower half radome inner skin; 24-Upper half radome mounting fixture; 25-Upper half radome outer skin; 26-Upper half radome honeycomb layer; 27-Fifth layer upper half radome outer skin; 28-Transition layer prepreg; 29-Upper half radome inner skin. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0050] like Figure 1 The diagram shows the structure of the radome 2. The radome 2 is divided into a lower half radome 4 and an upper half radome 5 according to its maximum shape 3. The lower half radome 4 is a paper honeycomb sandwich structure, the top opening flange 6 of the upper half radome 5 is a laminate structure, and the rest is a paper honeycomb sandwich structure.

[0051] To address the aforementioned radome structure, this invention provides a small-aperture truncated spherical radome molding mold 1, as shown below. Figure 2As shown, the molding die 1 is a screw-connected combined female mold structure, consisting of a lower female mold 7, a lower mounting ring 8, an upper female mold 9, and an upper mounting ring 10. The parting surface 11 of the lower female mold 7 and the upper female mold 9 is selected at the maximum outer shape 3 of the radome 2. The lower female mold 7 has the same geometry as the lower radome 4, and the inner cavity shape of the upper female mold 9 has the same geometry as the upper radome 5. The outer surface shape of both the lower female mold 7 and the upper female mold 9 is a cylindrical structure, and the radius of the cylinder is 40mm larger than the radius of the maximum outer shape 3 of the radome 2. The mounting surface of the lower female mold 7 is provided with four positioning guide posts 12 and four M12 threaded holes 13. The positioning guide posts 12 are used for the lower female mold 7. The combined positioning of the lower female mold 7 and the upper female mold 9 has a cylindrical structure with a 30° taper at the head. The positioning guide post 12 has a diameter of φ20h7 and a height of 50mm. The M12 threaded hole 13 is used for the screw connection of the lower female mold 7 and the upper female mold 9. The mounting surface of the upper female mold 9 is provided with four blind holes 14 and four φ12.5 through holes 15. The blind holes 14 are used in conjunction with the positioning guide post 12. The blind holes 14 have a diameter of φ20H7 and a height of 55mm. The φ12.5 through holes 15 are used in conjunction with the M12 threaded holes 13. The lower mounting ring 8 is used for the alternating upper and lower mounting of the skin and honeycomb of the lower half of the radome 4. The outer surface shape of the lower mounting ring 8 is consistent with the outer shape of the lower half of the female mold 7. The inner surface of the lower mounting ring 8 is a spherical structure with an upward (towards the top opening flange 6) cross section based on the maximum outer shape 3 of the radome, with a cross section height of 60mm. Four φ20H7 through holes 16 are provided on the mounting surface of the lower mounting ring 8. The positioning of the lower mounting ring 8 and the lower half of the female mold 7 is achieved by the positioning guide post 12. The upper mounting ring 10 is used for the alternating upper and lower mounting of the skin and honeycomb of the upper half of the radome 5. The outer surface shape of the upper mounting ring 10 is consistent with the outer shape of the upper half of the female mold 9. The inner surface of the upper mounting ring 10 is a downward (opposite to the top opening flange 6) spherical structure based on the honeycomb inner dimension at the maximum outer shape 3 of the radome (i.e., half of the maximum outer shape 3 of the radome minus the thickness of the inner skin and honeycomb). The cross-sectional height is 60mm. Four φ20H7 through holes 17 are provided on the mounting surface of the upper mounting ring 10. The upper mounting ring 10 is positioned with the upper half of the female mold 9 by the positioning pins 18. The lower half of the female mold 7, the lower mounting ring 8, the upper half of the female mold 9, and the upper mounting ring 10 are all made of 45 steel.

[0052] Based on the above-mentioned mold for forming a small-aperture truncated spherical radome, the present invention also provides a method for preparing a small-aperture truncated spherical radome, comprising the following steps:

[0053] Step 1: After cleaning the lower half-mold 7, lower laying ring 8, upper half-mold 9 and upper laying ring 10, apply release agent to the surface at least twice;

[0054] Step 2: The lower laying ring 8 and the lower half of the female mold 7 are positioned by the positioning guide post 12 to form the lower half of the antenna cover laying fixture 19;

[0055] Step 3: Using the top surface of the lower half-antenna radome laying fixture 19 as the starting point for layering, lay 5 layers of lower half-antenna radome outer skin 20 in an alternating pattern downwards, with an alternation distance of 15mm between each layer;

[0056] Step 4: Lay the lower half of the honeycomb layer 21, aligning the layup start line of the lower half of the honeycomb layer 21 with the lower half of the outer skin 22 of the 5th layer.

[0057] Step 5: Lay 5 layers of the lower half radome inner skin 23 in an alternating pattern downwards, with an alternation distance of 15mm between each layer. The starting line of the lower half radome inner skin 23 is aligned with the lower half honeycomb layer 21.

[0058] Step 6: Remove the lower paving ring 8 from the lower half of the mold 7;

[0059] Step 7: The upper mounting ring 10 and the upper half female mold 9 are positioned by the positioning pin 18 to form the upper half antenna cover mounting fixture 24;

[0060] Step 8: Starting from 60mm below the parting surface 11 of the upper half of the mold, lay 5 layers of the outer skin 25 of the upper half of the radome in an alternating pattern, with an alternation distance of 15mm between each layer.

[0061] Step 9: Lay out the upper half-antenna radome honeycomb layer 26, aligning the layup start line of the upper half-antenna radome honeycomb layer 26 with the 5th layer upper half-antenna radome outer skin 27;

[0062] Step 10: Lay 8 layers of transition layer prepreg at the open flange;

[0063] Step 11: Lay 5 layers of upper half radome inner skin 29 in an alternating pattern, with an alternation distance of 15mm between each layer. The starting line of the upper half radome inner skin 29 is aligned with the honeycomb layer 26 of the upper half radome.

[0064] Step 12: Remove the upper lining ring 10 and positioning pin 18 from the upper female mold 9;

[0065] Step 13: The upper female mold 7 and the upper female mold 9 are closed and positioned by the positioning guide post 12, and then screwed together to form an integral mold 1;

[0066] Step 14: Make a vacuum bag, cure it in an autoclave, demold it, make holes, and finally prepare the antenna cover 2.

[0067] The lower half-radome outer skin 20, the lower half-radome inner skin 23, the upper half-radome outer skin 25, and the upper half-radome inner skin 29 are all made of quartz fiber reinforced cyanate ester resin prepreg with a single layer thickness of 0.12 mm.

[0068] The transition layer prepreg 8 is a glass fiber reinforced epoxy resin prepreg with a single layer thickness of 0.5 mm.

[0069] The lower half of the radome honeycomb 21 and the upper half of the radome honeycomb 26 are Nomex paper honeycomb structures with a side length of 3.67 mm and a density of 48 kg / m³. 3 .

[0070] Example:

[0071] See appendix Figure 1 As shown, the radome 2 has a honeycomb sandwich structure, with the top opening flange 6 being a laminated plate structure. The radome 2 is divided into a lower half radome 4 and an upper half radome 5 according to its maximum external shape 3. The spherical diameter of the radome 2 is φ624.2mm, the height is 358.7mm, the outline dimensions of the top opening flange are 559mm×182mm, and the minimum opening size is less than one-third of the spherical diameter of the radome. At the same time, the design requires that the radome 2 be transparent across the entire surface, and the external shape tolerance is controlled within ±0.1mm.

[0072] See appendix Figure 2 Appendix Figure 3 Appendix Figure 4 As shown, the forming mold 1 is a female mold structure, which is composed of a lower female mold 7 and an upper female mold 9, which are positioned by positioning guide posts 12 and then screwed together. The parting surface 11 of the forming mold 1 is selected as the maximum outer shape 3 of the radome 2. The inner cavity shapes of the lower female mold 7 and the upper female mold 9 are consistent with the geometric shapes of the lower radome 4 and the upper radome 5, respectively. The outer surface shapes of the lower female mold 7 and the upper female mold 9 are both cylindrical structures, and the radius of the cylindrical surface is 40mm larger than the radius of the maximum outer shape 3 of the radome 2.

[0073] See appendix Figure 5 As shown, the outer surfaces of the lower mounting ring 8 and the upper mounting ring 10 are cylindrical structures, with shapes consistent with the outer shape of the forming mold 1. The inner surface of the lower mounting ring 8 is an upward (towards the top opening flange 6) spherical structure based on the maximum outer shape 3 of the radome, with a cross-sectional height of 60mm. After the lower mounting ring 8 and the lower half of the female mold 7 are positioned by the positioning guide post 12, the lower half of the radome mounting fixture 19 is formed. The inner surface of the upper mounting ring 10 is a downward (opposite direction to the top opening flange 6) spherical structure based on the honeycomb inner dimension at the maximum outer shape 3 of the radome (i.e., half of the maximum outer shape 3 of the radome minus the thickness of the inner skin and honeycomb), with a cross-sectional height of 60mm. After the upper mounting ring 10 and the upper half of the female mold 9 are positioned by the positioning pin 18, the upper half of the radome mounting fixture is formed.

[0074] See appendix Figure 6 Appendix Figure 7 and attached Figure 8As shown, the preparation process used by the present invention to achieve its objective includes the following steps:

[0075] (1) After cleaning the mold 7-10, apply release agent to the surface more than 2 times;

[0076] (2) The lower laying ring 8 and the lower half of the female mold 7 are positioned by the positioning guide post 12 to form the lower half of the antenna cover laying fixture 19;

[0077] (3) Using the top surface of the lower half radome laying fixture 19 as the starting point for layering, lay 5 layers of lower half radome outer skin 20 in an alternating manner downwards, with an alternation distance of 15mm between each layer;

[0078] (4) Lay the lower half honeycomb layer 21, and align the layup start line of the lower half honeycomb layer 21 with the lower half outer skin 22 of the 5th layer.

[0079] (5) Five layers of the lower half radome inner skin 23 are laid down in an alternating manner, with an alternation distance of 15mm between each layer. The starting line of the layup of the lower half radome inner skin 23 is aligned with the lower half honeycomb layer 21.

[0080] (6) Remove the lower paving ring 8 from the lower half of the mold 7;

[0081] (7) The upper mounting ring 10 and the upper half female mold 9 are positioned by the positioning pin 18 to form the upper half antenna cover mounting fixture 24;

[0082] (8) Taking the point 60mm below the parting surface 11 of the upper half of the mold as the starting point for layering, 5 layers of the outer skin 25 of the upper half of the radome are laid up alternately, with an alternating distance of 15mm between each layer.

[0083] (9) Lay the upper half radome honeycomb layer 26, and align the layup start line of the upper half radome honeycomb layer 26 with the outer skin 27 of the 5th upper half radome.

[0084] (10) Lay 8 layers of transition layer prepreg at the open flange;

[0085] (11) Five layers of upper half antenna radome inner skin 29 are laid in an alternating manner, with an alternation distance of 15mm between each layer. The starting line of the upper half antenna radome inner skin 29 is aligned with the upper half antenna radome honeycomb layer 26.

[0086] (12) Remove the upper paving ring 10 and the positioning pin 18 from the upper half of the female mold 9;

[0087] (13) The upper half female mold 7 and the upper half female mold 9 are closed and positioned by the positioning guide post 12, and then screwed together to form an integral mold 1;

[0088] (14) A vacuum bag is made, which is then cured in a thermostatic press. After demolding and drilling, the antenna cover 2 is finally obtained.

[0089] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the scope of the technology disclosed in the present invention, and such modifications or substitutions should all be covered within the scope of protection of the present invention.

Claims

1. A small opening truncated spherical antenna cover forming die, the antenna cover is divided into a lower half antenna cover and an upper half antenna cover according to the maximum contour, wherein the lower half antenna cover is a paper honeycomb sandwich structure, and the top opening flange of the upper half antenna cover is a laminated plate structure, and the remaining part is a paper honeycomb sandwich structure; characterized in that The forming die is a combined female die structure, comprising a lower half female die, a lower laying ring, an upper half female die and an upper laying ring. The outer surface of the lower half female die is in a cylindrical surface structure, and the inner cavity shape is consistent with the geometric shape of the lower half radome. The outer surface of the upper half female die is in a cylindrical surface structure, and the inner cavity shape is consistent with the geometric shape of the upper half radome. The lower half female die and the upper half female die can surround the radome after being combined; The lower laying ring and the upper laying ring are in a spherical surface structure, the lower laying ring and the lower half female die cooperate to form a lower half radome laying tool, and the upper laying ring and the upper half female die cooperate to form an upper half radome laying tool. The inner surface of the lower laying ring is an upward spherical surface structure with the maximum outer shape of the radome as a reference, and the cross-section height is 60mm; after the lower laying ring and the lower half female die are positioned by the positioning guide column, the lower half radome laying tool is formed. The inner surface of the upper laying ring is a downward spherical surface structure with the inner size of the honeycomb at the maximum outer shape of the radome as a reference, and the cross-section height is 60mm; after the upper laying ring and the upper half female die are positioned by the positioning pin, the upper half radome laying tool is formed.

2. The small opening truncated spherical antenna cover forming mold according to claim 1, wherein, The radius of the cylindrical surface structure of the lower half female die and the upper half female die is 40mm larger than the radius of the maximum outer shape of the radome.

3. The small opening truncated spherical antenna cover forming mold according to claim 1, wherein, The mounting surface of the lower half female die is provided with a positioning guide column and a threaded hole, and the positioning guide column is used for the combined positioning of the lower half female die and the upper half female die.

4. The small opening truncated spherical antenna cover forming mold according to claim 3, wherein, The structure of the positioning guide column is a cylindrical structure with a tapered head.

5. The small opening truncated spherical antenna cover forming mold according to claim 3, wherein, The mounting surface of the upper half female die is provided with a blind hole matched with the positioning guide column and a through hole matched with the threaded hole.

6. The small opening truncated spherical antenna cover forming mold according to claim 1, wherein, The lower half female die, the lower laying ring, the upper half female die and the upper laying ring are all made of 45 steel.

7. A method of forming a small opening truncated spherical cap radome based on the mold of claim 1, characterized in that The steps are as follows: Step 1: After the lower half female die, the lower laying ring, the upper half female die and the upper laying are cleaned, the surface is coated with release agent more than twice; Step 2: The lower laying ring and the lower half female die are positioned by the positioning guide column to form a lower half radome laying tool; Step 3: The top surface of the lower half radome laying tool is taken as a starting point for laying, and 5 layers of lower half radome outer skin are laid downward staggeredly; Step 4: The lower half honeycomb layer is laid, and the laying starting line of the lower half honeycomb layer is aligned with the 5th layer of lower half outer skin; Step 5: 5 layers of lower half radome inner skin are laid downward staggeredly, and the laying starting line of the lower half radome inner skin is aligned with the lower half honeycomb layer; Step 6: The lower laying ring is taken off from the lower half female die; Step 7: The upper laying ring and the upper half female die are positioned by the positioning pin to form an upper half radome laying tool; Step 8: The place 60mm downward from the parting surface of the upper half female die is taken as a starting point for laying, and 5 layers of upper half radome outer skin are laid upward staggeredly; Step 9: The upper half radome honeycomb layer is laid, and the laying starting line of the upper half radome honeycomb layer is aligned with the 5th layer of upper half radome outer skin; Step 10: 8 layers of transition layer prepreg are laid at the opening flange; Step 11: 5 layers of upper half radome inner skin are laid upward staggeredly, and the laying starting line of the upper half radome inner skin is aligned with the upper half radome honeycomb layer; Step 12: The upper laying ring and the positioning pin are taken off from the upper half female die. Step 13: the upper half-mold and the lower half-mold are combined, and after positioning by positioning guide columns, the two are screw-connected to form an integrated molding mold; Step 14: a vacuum bag is made, and hot-pressing tank curing molding is performed to finally prepare the radome after demolding and hole making.

8. The method of claim 7, wherein the forming of the small opening truncated spherical shell antenna cover is performed by a process comprising: The staggered distance between each layer of the skin is 15 mm, and the skin includes an outer skin or an inner skin.

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