High-precision antenna reflector, method and device for manufacturing same

Abstract

The application discloses a high-precision antenna reflecting surface, a manufacturing method and device thereof, and the high-precision antenna reflecting surface comprises a reflecting surface body of an integrally-formed elliptical curved surface structure, the back surface of the reflecting surface body is provided with a reinforcing rib grid formed by interlacing radial ribs and annular ribs; the reinforcing rib grid is anisotropic distribution, wherein the structural strength parameter of the reinforcing rib distributed along the major axis direction is superior to that of the reinforcing rib distributed along the minor axis direction. Through the anisotropic distribution of the reinforcing rib grid, the weak item of the stiffness of the elliptical reflecting surface in the major axis direction is effectively compensated, and the overall structural stability and surface shape precision of the reflecting surface are improved.

Description

Technical Field

[0001] This application relates to the field of antenna manufacturing technology, specifically to a high-precision antenna reflector, its manufacturing method, and apparatus. Background Technology

[0002] With the rapid development of wireless communication, deep space exploration, and radio astronomy technologies, operating frequency bands are constantly expanding to higher frequencies. High-frequency communication offers advantages such as high transmission rates and large bandwidth, meeting the ever-increasing demand for information transmission. In deep space exploration and radio astronomy, high-frequency antennas can also provide more accurate detection and observation data. When an antenna is operating, the surface accuracy of its reflector directly determines its gain and efficiency; for high-frequency antennas, the requirements for reflector accuracy are even higher.

[0003] In traditional reflector technology, the following methods are commonly used to solve antenna reflector-related problems. First, a honeycomb sandwich structure, characterized by its lightweight nature, can meet the requirement of antenna weight reduction to some extent. Second, a segmented assembly structure, which is convenient for transportation and is commonly used in some large antenna applications. In addition, elliptical reflector structures are also widely used because they can generate elliptical beams, which can better match specific coverage areas and achieve low-profile designs. Regarding manufacturing processes, especially the stress-relief annealing stage, existing technologies typically use general-purpose annealing furnaces.

[0004] However, existing technologies have significant drawbacks. In high-frequency applications, the honeycomb sandwich structure has an extremely thin lower panel, and the mismatch in thermal expansion coefficients between the honeycomb core material and the panel easily leads to thermal deformation, and the manufacturing process is complex. The splicing error of segmented assembly structures becomes a significant problem in high-frequency applications, severely affecting overall accuracy. Elliptical reflective surface structures exhibit anisotropy in mechanics, with a large span along the major axis and relatively weak stiffness, making them more prone to deformation under their own weight, wind loads, and temperature changes. Furthermore, in the stress-relief annealing stage of the manufacturing process, for thin-walled, irregularly shaped workpieces with complex high and low reinforcing ribs on the back, traditional annealing can cause gravitational creep and uneven cooling, leading to a loss of machining accuracy. Summary of the Invention

[0005] To address the technical problems in the prior art, this application provides a high-precision antenna reflector, its manufacturing method, and apparatus.

[0006] This application provides a high-precision antenna reflector, its manufacturing method, and its apparatus, which adopt the following technical solution:

[0007] A high-precision antenna reflector includes:

[0008] The reflective surface body is an integrally formed elliptical curved surface structure with a major axis and a minor axis; the front side of the reflective surface body is a working curved surface for reflecting electromagnetic waves, and the back side of the reflective surface body is provided with a reinforcing structure.

[0009] The reinforcing structure includes a reinforcing rib grid formed by interlacing a plurality of radial and circumferential ribs; the reinforcing rib grid is anisotropically distributed, wherein the structural strength parameters include the distribution density of the reinforcing ribs and the height of the reinforcing ribs, wherein the distribution density of the reinforcing ribs distributed along the long axis is greater than that of the reinforcing ribs distributed along the short axis, and / or, the height of the reinforcing ribs distributed along the long axis is greater than that of the reinforcing ribs distributed along the short axis.

[0010] In some embodiments, the height of the reinforcing rib decreases from the central region of the reflective surface body to the edge region; the height of the reinforcing rib in the long axis direction decreases uniformly from a first height to the edge height from the center outwards.

[0011] In some embodiments, the height of the reinforcing rib in the short axis direction decreases uniformly from the center outwards from the second height to the edge height; wherein the first height is greater than the second height.

[0012] In some embodiments, the material of the reflective surface body is 7-series aluminum alloy; the reflective surface body is an integral part manufactured by CNC milling a whole pre-stretched aluminum alloy sheet.

[0013] In some embodiments, the back side of the reflective surface body has a plurality of closed lightweight cavities formed between the reinforcing ribs; the lightweight cavities are formed by removing material from the back side of the reflective surface, and the reflective surface body retains a preset wall thickness.

[0014] In some embodiments, the surface of the reflective surface body is subjected to a bright anodizing treatment, and the back of the reflective surface body is coated with a temperature control coating.

[0015] This application also provides a method for manufacturing a high-precision antenna reflector, applicable to the aforementioned high-precision antenna reflector, and includes the following steps:

[0016] Step S1: Select 7-series aluminum alloy pre-stretched thick plate as the blank;

[0017] Step S2: Roughly machine the blank to remove excess material and initially form the front and back contours of the reflective surface;

[0018] Step S3: Use a five-axis CNC machine tool to perform finishing on the front of the reflective surface, and plan the tool path based on the NURBS curve;

[0019] Step S4: In the same clamping state or after flipping the clamping, the back of the reflective surface is milled to process the anisotropically distributed reinforcing rib grid and lightweight cavity;

[0020] Step S5: Perform stress-relieving annealing and surface treatment on the processed reflective surface;

[0021] Step S6: Use a coordinate measuring machine to check the surface accuracy and correct any minor errors.

[0022] This application also provides a manufacturing apparatus for a high-precision antenna reflector, used to implement the manufacturing method of the high-precision antenna reflector, including an annealing mechanism for performing stress-relieving annealing on the processed reflector, the annealing mechanism comprising:

[0023] The conformal base has a supporting curved surface on its upper surface that is conjugate to the working curved surface of the reflective surface body. The conformal base has an air collection cavity inside, and the supporting curved surface has a number of adsorption holes that communicate with the air collection cavity.

[0024] A negative pressure adsorption system, connected to the gas collection cavity of the conformal base, is used to provide negative pressure during the annealing process, so that the reflective surface body is in close contact with the supporting curved surface;

[0025] A heat compensation cover plate is installed above the back of the reflective surface body;

[0026] A temperature monitoring unit, integrated on the heat compensation cover plate, includes multiple infrared cameras disposed on the inner side of the heat compensation cover plate, for real-time capture and monitoring of the surface temperature field of each area on the back of the reflective surface body.

[0027] The airflow injection unit includes an air pump, a gas distributor, and several nozzles evenly distributed on a heat compensation cover plate. The outlet of the air pump is connected to the inlet of the gas distributor. The gas distributor has several outlets, each of which is equipped with an electric proportional regulating valve. The electric proportional regulating valve is connected to the corresponding nozzle through a hose.

[0028] An attitude adjustment unit includes several nozzle position adjustment components mounted on a heat compensation cover plate, wherein the nozzles are mounted on the nozzle position adjustment components; the nozzle position adjustment components are configured to adjust the relative height and / or spray azimuth angle of the nozzles on the heat compensation cover plate to change the landing point of the airflow impacting the back of the reflective surface.

[0029] In some embodiments, the nozzle position adjustment component includes a ball joint structure or telescopic rod structure installed at a through hole in the thermal compensation cover plate, allowing the nozzle to deflect and extend in multiple degrees of freedom; the electric proportional regulating valve and the infrared camera are both connected to a central control unit, which is equipped with a temperature control algorithm to control the opening degree of each regulating valve according to temperature data.

[0030] In some embodiments, the central control unit is configured to perform the following temperature homogenization control logic during the annealing cooling phase:

[0031] Step A: Acquire real-time thermal imaging data of the back side of the reflective surface using the multiple infrared cameras, and divide the back side of the reflective surface into... There are temperature control zones, and calculations are performed for each zone. Real-time temperature value ;

[0032] Step B: Calculate the average temperature of all regions at the current moment. The formula is:

[0033] ,

[0034] Step C: Based on the deviation between the regional temperature and the average temperature, output instructions to adjust the corresponding region. The opening degree of the electric proportional control valve The adjustment algorithm follows the formula below:

[0035] ,

[0036] in, Represents a time variable. Indicates the area code ( ), The basic opening preset value, This is the proportional gain coefficient. The differential gain coefficient, Represents a differential operator with respect to time; when At that time, the algorithm output Increase the volume of airflow jets in the high-temperature area to accelerate heat dissipation;

[0037] Step D: Adjust the nozzle position adjustment component to align the nozzle spray direction with the local highest temperature point in each temperature control area until the overall temperature of the reflective surface body drops to the preset value.

[0038] In summary, this application includes at least one of the following beneficial technical effects:

[0039] 1. By employing a one-piece molded elliptical curved surface structure for the reflector body, splicing errors are avoided, and accuracy is improved. The anisotropic distribution of the reinforcing rib grid specifically compensates for the stiffness weakness along the major axis of the elliptical reflector, enhancing overall structural stability. The lightweight cavity design reduces weight while maintaining stiffness, and the application of surface treatment and temperature-controlled coatings further improves the performance and stability of the reflector. Compared with traditional reflector technologies, this embodiment better meets the accuracy and stiffness requirements of high-frequency antennas while achieving a lightweight design.

[0040] 2. By selecting appropriate materials and advanced processing techniques, each step, from blank selection to final inspection and finishing, is strictly controlled to ensure the manufacturing quality of the high-precision antenna reflector. Stress-relief annealing and surface treatment further improve the performance and stability of the reflector. Compared with traditional manufacturing methods, this embodiment can better meet the requirements of high-frequency antennas for reflector precision and performance, improving product yield and reliability.

[0041] 3. By using a conformal base and a negative pressure adsorption system, the problem of gravitational creep of the reflective surface during annealing is solved. The thermal compensation cover plate, combined with a temperature monitoring unit, an airflow injection unit, an attitude adjustment unit, and a temperature control algorithm in the central control unit, can monitor the temperature field on the back of the reflective surface in real time and precisely adjust the airflow injection volume and direction according to the temperature deviation, achieving uniform cooling and eliminating secondary thermal stress caused by uneven cooling. Compared with traditional annealing devices, this embodiment can better control the annealing deformation of the reflective surface, improving the processing accuracy and finished product yield. Attached Figure Description

[0042] Figure 1 This is a three-dimensional structural schematic diagram of the elliptical reflective surface body provided in Embodiment 1 of the present invention;

[0043] Figure 2 This is a cross-sectional structural diagram of the elliptical reflective surface body provided in Embodiment 1 of the present invention, showing the layout of anisotropic reinforcing ribs;

[0044] Figure 3 This is a physical image of the elliptical reflective surface body provided in Embodiment 1 of the present invention;

[0045] Figure 4 This is a deformation cloud diagram of the reflective surface under static force in Embodiment 1 of the present invention;

[0046] Figure 5 This is a stress cloud diagram of the reflecting surface under static force in Embodiment 1 of the present invention;

[0047] Figure 6 This is a deformation cloud map of the reflective surface in Embodiment 1 of the present invention at +100℃.

[0048] Figure 7 This is a deformation cloud map of the reflective surface in Embodiment 1 of the present invention at -100℃.

[0049] Figure 8 This is a schematic cross-sectional view of the overall structure of the intelligent feedback conformal annealing device provided in Embodiment 3 of the present invention;

[0050] Figure 9 yes Figure 8 A magnified view of a portion of region A in the middle;

[0051] Explanation of reference numerals in the attached drawings: 1. Conformal base; 11. Adsorption hole; 12. Gas collection chamber; 13. Sealing ring; 2. Negative pressure adsorption system; 3. Thermal compensation cover plate; 4. Temperature monitoring unit; 41. Infrared camera; 5. Air jet unit; 51. Air pump; 52. Gas distributor; 53. Nozzle; 54. Electrical proportional regulating valve; 55. Hoses; 6. Nozzle position adjusting component; 7. Reflector body. Detailed Implementation

[0052] The technical solutions in the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The described embodiments are only possible technical implementations of the present invention, but are not limited thereto. Other embodiments obtained by those skilled in the art in conjunction with the embodiments of the present invention without creative effort are also within the protection scope of the present invention.

[0053] This application mainly adopts a combination of optimized reinforcing ribs and lightweight design to improve the performance of the reflective surface, effectively compensating for the weakness of the long axis stiffness of the elliptical reflective surface, and achieving the effect of high precision and lightweight. The following is a further detailed description of this application.

[0054] Example 1

[0055] Please refer to Figures 1-3 The high-precision antenna reflector provided in this application embodiment is suitable for high-frequency bands such as Ka, Q / V, and even terahertz, with a surface shape accuracy RMS value better than 0.05mm. The reflector includes a reflector body 7 and a reinforcing structure. The reinforcing structure is located on the back of the reflector body 7, and its anisotropic distribution of reinforcing ribs effectively compensates for the stiffness weakness of the elliptical reflector in the major axis direction, improving the overall stability and accuracy of the reflector.

[0056] Specifically, such as Figure 1As shown, the reflector body 7 is an integrally formed elliptical curved surface structure with a major axis and a minor axis. Its front side is the working curved surface used to reflect electromagnetic waves. The working curved surface adopts a dual-reflector hybrid shaping design, combining the advantages of ring focal and Cassegrain structures. Through shaping technology, the beam shape is precisely controlled, effectively suppressing sidelobe levels and improving the antenna's aperture efficiency to over 50%. As a specific example, the maximum external dimensions of the reflector can be designed to be 500mm × 314.6mm × 125mm, with an average wall thickness of only 1.5mm and a bottom mounting surface wall thickness of 6mm.

[0057] The reflector body 7 is made of 7-series aluminum alloy, preferably 7075 aluminum alloy, which has a yield strength of over 500 MPa, a low coefficient of thermal expansion, and better dimensional stability. The reflector body 7 is a single piece manufactured by CNC milling a pre-stretched aluminum alloy sheet. This integrated molding method avoids splicing errors and improves the precision of the reflector. For example, in actual processing, a high-precision CNC milling machine can be used to precisely mill the aluminum alloy sheet according to a preset program to obtain the desired elliptical curved surface structure.

[0058] like Figure 2 As shown, the reinforcing structure comprises a reinforcing mesh formed by interwoven radial and circumferential ribs. The reinforcing mesh is anisotropically distributed, with the structural strength parameters of ribs distributed along the major axis being superior to those distributed along the minor axis. The structural strength parameters include the rib density and the rib height. The spacing between ribs distributed along the major axis is smaller than that along the minor axis, and / or, the average height of ribs distributed along the major axis is greater than the average height of ribs distributed along the minor axis.

[0059] As a specific parameter example, the spacing d1 of the reinforcing ribs along the long axis of the reflector can be set to 78.65 mm and the rib width to 5 mm; the spacing d2 of the reinforcing ribs along the short axis of the reflector can be set to 83.3 mm and the rib width to 5 mm. The denser spacing of the reinforcing ribs along the long axis provides more support in the direction with a large span and relatively weak stiffness, thus enhancing the bending resistance along the long axis. The height of the reinforcing ribs decreases from the center area of ​​the reflector body 7 to the edge area. The height of the reinforcing ribs along the long axis decreases uniformly from the center to the edge height from a first height, while the height of the reinforcing ribs along the short axis decreases uniformly from the center to the edge height from a second height, with the first height being greater than the second height. For example, the height of the long axis ribs decreases uniformly from 20.3 mm to 3.5 mm from the center to the edge, and the height of the short axis ribs decreases uniformly from 5 mm to 3.5 mm from the center to the edge. This height distribution design ensures the strength of the central area while reducing the weight of the edge area to a certain extent, achieving a balance between strength and weight.

[0060] The working process and technical effects of the aforementioned reinforced structure are as follows: High-density, long-axis reinforcing ribs increase the moment of inertia of the cross-section, distributing concentrated loads over a larger area and suppressing deformation of the reflective surface; simultaneously, the reinforcing ribs divide the reflective surface into small panels, converting bending stress into localized internal forces within the reinforcing ribs, thus preventing stress concentration. Please refer to... Figures 4 to 7 Finite element analysis shows that the structure maintains excellent morphological stability under its own weight, wind load, and temperature variations from -100℃ to +100℃.

[0061] The back of the reflector body 7 has several closed, lightweight cavities formed between the reinforcing ribs. These lightweight cavities are formed by removing material from the back of the reflector, while the reflector body 7 retains a predetermined wall thickness. The design of these lightweight cavities effectively reduces the weight of the reflector while maintaining its rigidity. For example, a certain amount of material can be removed from the back of the reflector using milling to form these closed cavities.

[0062] The surface of the reflector body 7 undergoes a bright anodizing treatment, which improves the corrosion resistance and surface smoothness of the reflector, thus facilitating the reflection of electromagnetic waves. The back of the reflector body 7 is coated with a temperature-controlled coating (such as temperature-controlled white paint), which regulates the temperature of the reflector and reduces deformation caused by temperature changes.

[0063] The implementation principle of this embodiment is as follows: By employing an integrated elliptical curved surface structure for the reflector body 7, splicing errors are avoided, and accuracy is improved. The anisotropic distribution of the reinforcing rib grid specifically compensates for the stiffness weakness along the major axis of the elliptical reflector, enhancing the overall structural stability. The lightweight cavity design reduces weight while maintaining stiffness, and the application of surface treatment and temperature-controlled coating further improves the performance and stability of the reflector. Compared with traditional reflector technologies, this embodiment better meets the accuracy and stiffness requirements of high-frequency antennas while achieving a lightweight design.

[0064] Example 2

[0065] The method for manufacturing a high-precision antenna reflector provided in this application includes the following steps:

[0066] S1 uses a pre-stretched 7-series aluminum alloy plate as the blank. 7-series aluminum alloys have high strength and good machinability; the pre-stretched plate reduces internal stress and improves machining accuracy. When selecting the blank, a suitable 7-series aluminum alloy pre-stretched plate should be chosen based on the size and performance requirements of the reflective surface.

[0067] S2, rough machining of the blank, removes excess material and initially forms the front and back contours of the reflective surface. Rough machining can be performed using a conventional milling machine or lathe, removing most of the excess material according to design requirements to prepare for subsequent finish machining. During rough machining, it is important to control machining accuracy and avoid over-cutting or under-cutting.

[0068] The S3 uses a five-axis CNC machine tool for precision machining of the reflective surface, with toolpath planning based on NURBS curves. Five-axis CNC machine tools can achieve high-precision machining of complex curved surfaces, and NURBS curves can accurately describe the surface shape of the reflective surface. By rationally planning the toolpath, for example, dividing the reflective surface into a central area, transition area, and edge area, a three-dimensional equidistant offset strategy is used for the main body area with gentle curvature changes to ensure consistent residual height; for the edge or transition areas with drastic curvature changes, a contour line strategy is used to effectively control tool deflection errors. High spindle speeds (up to 60,000 rpm) and high feed rates are used during machining to avoid tool stoppages and maintain smooth, continuous cutting.

[0069] S4. In the same clamping state or after flipping the clamping, mill the back of the reflective surface to machine anisotropically distributed reinforcing rib mesh and lightweight cavity. When machining the reinforcing rib mesh, the distribution density and height of the reinforcing ribs should be controlled according to the different requirements in the major and minor axis directions. For machining the lightweight cavity, helical interpolation milling can be used to achieve constant cutting load, reduce cutting impact, improve machining stability, and the corners of the tool path need to be smoothed. It is important to retain the preset wall thickness to ensure the rigidity of the reflective surface.

[0070] The technical effect of the above processing steps is that, through NURBS curve planning and specific partitioned processing strategies, combined with helical interpolation technology, the chatter problem that is prone to occur during the milling of thin-walled (1.5mm) workpieces is effectively solved, ensuring uniform wall thickness and surface quality, and reducing the introduction of residual processing stress.

[0071] S5, the processed reflective surface undergoes stress-relief annealing and surface treatment. Stress-relief annealing eliminates residual stress generated during processing, preventing deformation of the reflective surface during use. The specific annealing control logic will be described in detail in Example 3. Surface treatment includes bright anodizing and back-side spraying with a temperature-controlled coating to improve the reflective surface's corrosion resistance, surface smoothness, and temperature regulation capability. During stress-relief annealing, specialized annealing equipment can be used, and operations can be performed according to preset process parameters.

[0072] S6. A coordinate measuring machine (CMM) is used to inspect the surface shape accuracy and correct for minute errors. The CMM can accurately measure the surface shape accuracy of the reflective surface. For micron-level errors, additional resin molding technology can be used for local correction to stably control the surface shape accuracy (RMS) within 0.05mm.

[0073] The implementation principle of this embodiment is as follows: The manufacturing method of this embodiment, through the selection of suitable materials and advanced processing technology, strictly controls each step from the selection of the blank to the final inspection and finishing, ensuring the manufacturing quality of the high-precision antenna reflector. Stress-relief annealing and surface treatment further improve the performance and stability of the reflector. Compared with traditional manufacturing methods, this embodiment can better meet the requirements of high-frequency antennas for the precision and performance of the reflector, improving the product qualification rate and reliability.

[0074] Example 3

[0075] Please refer to Figure 8 and Figure 9 The high-precision antenna reflector manufacturing apparatus provided in this application includes an annealing mechanism for stress-relief annealing of the processed reflector. The annealing mechanism includes a conformal base 1, a negative pressure adsorption system 2, a heat compensation cover plate 3, a temperature monitoring unit, an airflow injection unit, and an attitude adjustment unit.

[0076] The conformal base 1 has a supporting curved surface on its upper surface that conjugates with the working curved surface of the reflector body 7. The conformal base 1 contains a gas collecting cavity 12, and the supporting curved surface has several adsorption holes 11 connecting to the gas collecting cavity 12. The conformal base 1 can be made of high-temperature resistant microporous ceramic or graphite, which have good high-temperature resistance and support properties. The edge area of ​​the conformal base 1 also has a high-temperature resistant flexible sealing ring 13 (such as ceramic fiber felt or flexible graphite paper) to form a vacuum sealing interface when the reflector body 7 is placed. For example, in practical applications, a supporting curved surface that conjugates with the shape of the reflector body 7 is precisely machined to ensure that the reflector body 7 can fit tightly against the conformal base 1. Figure 8 and Figure 9 As shown, the conformal base 1 is located at the bottom of the device, and its cross-section shows a convex curved surface structure that matches the reflective surface body 7. The interior is connected to the negative pressure adsorption system 2 through a pipeline.

[0077] The negative pressure adsorption system 2 is connected to the gas collection chamber 12 of the conformal base 1 to provide negative pressure during the annealing process, so that the reflective surface body 7 is tightly attached to the supporting curved surface. During the annealing and heat preservation stage, the vacuum pump is turned on, and a negative pressure of about -0.05MPa to -0.08MPa is used to tightly adsorb the softened reflective surface body 7 onto the standard curved surface of the base. Atmospheric pressure is used for "thermal correction" to prevent the reflective surface from collapsing and deforming due to its own weight at high temperature.

[0078] The working process and technical effects of the negative pressure adsorption system 2 are as follows: When aluminum alloy materials soften at the annealing temperature (approximately 300-400℃), simple mechanical support cannot completely eliminate the elastic rebound generated during processing. Negative pressure adsorption provides a uniformly distributed load, forcibly pulling the thin-walled reflective surface towards the standard theoretical curved surface, which not only overcomes gravitational creep but also physically corrects processing errors.

[0079] A heat compensation cover 3 is mounted on the upper back of the reflector body 7. The heat compensation cover 3 integrates a temperature monitoring unit and an airflow injection unit. Figure 8 and Figure 9 As can be seen, the thermal compensation cover plate 3 is suspended above the conformal base 1, and its lower surface does not directly contact the reflective surface body 7, but rather leaves space for airflow. The temperature monitoring unit includes multiple infrared cameras 41 installed inside the thermal compensation cover plate 3, used to capture and monitor the surface temperature field of various areas on the back of the reflective surface body 7 in real time. The field of view of the infrared cameras 41 covers the entire back of the reflective surface, enabling accurate acquisition of temperature information for each area.

[0080] The airflow injection unit includes an air pump 51, a gas distributor 52, and several nozzles 53 evenly distributed on the heat compensation cover plate 3. Cooling gas generated by the external air pump 51 enters the gas distributor 52 and is then divided into multiple paths. Each path is equipped with an electric proportional control valve 54, which is connected to the nozzle 53 inside the heat compensation cover plate 3 via a high-temperature resistant hose 55. Figure 8 and Figure 9 As shown, the flexible hose 55 is radially connected to various areas of the heat compensation cover plate 3, realizing zoned airflow delivery. The attitude adjustment unit includes several nozzle position adjustment components 6 mounted on the heat compensation cover plate 3, with nozzles 53 mounted on the nozzle position adjustment components 6. The nozzle position adjustment components 6 are configured to adjust the relative height and / or spray azimuth angle of the nozzles on the heat compensation cover plate 3 to change the landing point of the airflow impacting the back of the reflector surface. The nozzle position adjustment components 6 can be ball joint structures or telescopic rod structures, allowing the nozzles to deflect and extend in multiple degrees of freedom.

[0081] Both the electric proportional control valve 54 and the infrared camera 41 are connected to a central control unit. The central control unit is equipped with a temperature control algorithm to control the opening degree of each control valve based on temperature data. During the annealing cooling stage, the central control unit executes the following temperature homogenization control logic:

[0082] Step A: Acquire real-time thermal imaging data of the back side of the reflective surface body 7 using multiple infrared cameras 41, and divide the back side of the reflective surface into... There are temperature control zones, and calculations are performed for each zone. Real-time temperature value For example, each intersection of stiffeners can be defined as a region.

[0083] Step B: Calculate the average temperature of all regions at the current moment. The formula is: .

[0084] Step C: Based on the deviation between the regional temperature and the average temperature, output instructions to adjust the corresponding region. The opening degree of the electric proportional control valve 54 The adjustment algorithm follows the formula below:

[0085] ,

[0086] in, Represents a time variable. Indicates the area code ( ), The basic opening preset value, This is the proportional gain coefficient. The differential gain coefficient, This represents the differential operator with respect to time. When At that time, the algorithm output Increase the volume of airflow jets in the high-temperature area to accelerate heat dissipation.

[0087] The technical advantage of the above algorithm lies in the proportion term in the formula. This ensures that areas with higher temperatures (such as thicker ribs) receive a larger cooling airflow; differential term A predictive mechanism is introduced to adjust the valve opening in advance based on the rate of temperature change, preventing temperature overshoot due to excessively rapid cooling. This closed-loop control ensures that the temperature difference throughout the reflector surface remains within a very small range.

[0088] Step D: Using the nozzle position adjustment component 6, align the nozzle 53 spray direction with the local highest temperature point in each temperature control area until the overall temperature of the reflective surface body 7 drops to the preset value.

[0089] The implementation principle of this embodiment is as follows: The manufacturing device of this embodiment effectively solves the problem of gravitational creep of the reflective surface during the annealing process through the conformal base 1 and the negative pressure adsorption system 2. The thermal compensation cover plate 3, combined with the temperature monitoring unit, the airflow injection unit, the attitude adjustment unit, and the temperature control algorithm of the central control unit, can monitor the temperature field on the back of the reflective surface in real time, and accurately adjust the airflow injection volume and direction according to the temperature deviation, thereby achieving uniform cooling and eliminating secondary thermal stress caused by uneven cooling. Compared with traditional annealing devices, this embodiment can better control the annealing deformation of the reflective surface, improving the processing accuracy of the reflective surface and the yield of finished products.

[0090] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Any other corresponding changes and modifications made based on the technical concept of this application should be included within the scope of protection of this application.

Claims

1. A method for manufacturing a high-precision antenna reflector, characterized in that, The high-precision antenna reflector includes a reflector body (7), which is an integrally formed elliptical curved surface structure with a major axis and a minor axis. The front side of the reflector body (7) is a working curved surface for reflecting electromagnetic waves, and the back side of the reflector body (7) is provided with a reinforcing structure. The reinforcing structure includes a reinforcing rib grid formed by interlacing several radial and circumferential ribs. The reinforcing rib grid is anisotropically distributed, wherein the distribution density of the reinforcing ribs distributed along the major axis is greater than the distribution density of the reinforcing ribs distributed along the minor axis, and / or, the height of the reinforcing ribs distributed along the major axis is greater than the height of the reinforcing ribs distributed along the minor axis. The height of the reinforcing rib decreases from the center region of the reflective surface body (7) to the edge region; the height of the reinforcing rib in the long axis direction decreases uniformly from the first height to the edge height from the center to the periphery. The height of the reinforcing ribs along the short axis decreases uniformly from the second height at the center to the edge height from the center outwards; wherein the first height is greater than the second height; The manufacturing method of the high-precision antenna reflector includes the following steps: Step S1: Select 7-series aluminum alloy pre-stretched thick plate as the blank; Step S2: Roughly machine the blank to remove excess material and initially form the front and back contours of the reflective surface; Step S3: Use a five-axis CNC machine tool to perform finishing on the front of the reflective surface, and plan the tool path based on the NURBS curve; Step S4: In the same clamping state or after flipping the clamping, the back of the reflective surface is milled to process the anisotropically distributed reinforcing rib grid and lightweight cavity; Step S5: Perform stress-relief annealing and surface treatment on the processed reflective surface. The stress-relief annealing is performed using an annealing mechanism, which includes: The conformal base (1) has a support surface on its upper surface that is conjugate to the working surface of the reflective surface body (7). The conformal base (1) has an air collection cavity (12) inside. The support surface has a plurality of adsorption holes (11) that connect to the air collection cavity (12). The negative pressure adsorption system (2) is connected to the gas collection chamber (12) of the conformal base (1) and is used to provide negative pressure during the annealing process so that the reflective surface body (7) is in close contact with the supporting curved surface; A heat compensation cover plate (3) is installed above the back of the reflective surface body (7); Temperature monitoring unit (4), which is integrated on the heat compensation cover plate (3), includes multiple infrared cameras (41) set on the inner side of the heat compensation cover plate (3) for real-time shooting and monitoring of the surface temperature field of each area on the back of the reflective surface body (7); The airflow injection unit (5) includes an air pump (51), a gas distributor (52), and a plurality of nozzles (53) evenly distributed on the heat compensation cover plate (3). The outlet of the air pump (51) is connected to the inlet of the gas distributor (52). The gas distributor (52) has a plurality of outlets, each of which is equipped with an electric proportional regulating valve (54). The electric proportional regulating valve (54) is connected to the corresponding nozzle (53) through a hose (55). The attitude adjustment unit includes several nozzle position adjustment components (6) mounted on the heat compensation cover plate (3), and the nozzle (53) is mounted on the nozzle position adjustment component (6); the nozzle position adjustment component (6) is configured to adjust the relative height and / or spray azimuth angle of the nozzle (53) on the heat compensation cover plate (3) to change the landing point of the airflow impacting the back of the reflective surface body (7); Step S6: Use a coordinate measuring machine to check the surface accuracy and correct any minor errors.

2. The method for manufacturing a high-precision antenna reflector according to claim 1, characterized in that, In step S4, the reflective surface body (7) retains a preset wall thickness.

3. The method for manufacturing a high-precision antenna reflector according to claim 1, characterized in that, The surface of the reflective body (7) is treated with bright anodizing, and the back of the reflective body (7) is coated with a temperature control coating.

4. The method for manufacturing a high-precision antenna reflector according to claim 1, characterized in that, The nozzle position adjustment component (6) includes a ball joint structure or telescopic rod structure installed at the through hole of the heat compensation cover plate (3), which allows the nozzle (53) to deflect and extend in multiple degrees of freedom; the electric proportional regulating valve (54) and the infrared camera (41) are both connected to a central control unit, which is equipped with a temperature control algorithm to control the opening degree of each regulating valve according to the temperature data.

5. The method for manufacturing a high-precision antenna reflector according to claim 4, characterized in that, The central control unit is configured to execute the following temperature homogenization control logic during the annealing cooling phase: Step A: Obtain real-time thermal imaging data of the back side of the reflective surface body (7) through the multiple infrared cameras (41), and divide the back side of the reflective surface into... There are temperature control zones, and calculations are performed for each zone. Real-time temperature value ; Step B: Calculate the average temperature of all regions at the current moment. The formula is: ； Step C: Based on the deviation between the regional temperature and the average temperature, output instructions to adjust the corresponding region. The opening degree of the electric proportional control valve (54) The adjustment algorithm follows the formula below: ， in, Represents a time variable. Indicates the area code. The basic opening preset value, This is the proportional gain coefficient. The differential gain coefficient, Represents a differential operator with respect to time; when At that time, the algorithm output Increase the volume of airflow jets in the high-temperature area to accelerate heat dissipation; Step D: Adjust the nozzle position adjustment component (6) to align the nozzle (53) spray direction with the local highest temperature point in each temperature control area until the overall temperature of the reflective surface body drops to the preset value.

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