Lightweight low-expansion connecting ring structure for 3D printing and manufacturing method

Abstract

The application discloses a kind of lightweight low expansion connecting ring structure and manufacturing method for 3D printing, comprising: glue joint section, for being connected with radome;Base is integrally formed with the glue joint section, and located below the glue joint section, for being connected with cabin;Wherein, the glue joint section is hollow conical ring body;The taper of the conical ring body is 2°-5°;The wall thickness of the conical ring body gradually thickens from the end away from base to the end connected with base;The base adopts annular skin dot array structure;The skin dot array structure includes hollow dot array structure, and two layers of skin are respectively arranged at the top end and bottom end of the dot array structure.The application changes the production and manufacturing method of connecting ring, material selection and structure design, and obtains the connecting ring with the comprehensive performance of lightweight, low expansion, easy manufacturing and the like.

Description

Technical Field

[0001] This invention relates to the field of lightweight, low-expansion connector manufacturing, and in particular to a lightweight, low-expansion connector structure and manufacturing method for 3D printing. Background Technology

[0002] The connecting ring is a key component for connecting the radome to the cabin. To prevent the connecting ring from being damaged by thermal stress due to the brittle radome under high temperatures, it is generally made of low-expansion alloy steel with high strength and thermal expansion matching the radome material, such as 4J32, 4J36, and 4J40. In existing technologies, composite materials are also used to manufacture connecting rings, but their structural strength is still somewhat inferior to that of connecting rings made from low-expansion alloy materials. Furthermore, due to space constraints, it is difficult to increase the strength of composite material connecting rings by thickening them, resulting in problems such as low strength and easy deformation. Existing technologies also achieve lightweighting of low-expansion alloy steel connecting rings through structural design, but the complexity of the structure leads to significant processing difficulties and manufacturing costs during machining.

[0003] In summary, existing connecting rings are generally manufactured by forging a blank and then machining it, which has the following problems: First, there is the issue of structural strength of the connecting ring; second, the production cost is high and the processing cycle is long, making it difficult to respond to the needs of rapid research and development; third, due to limitations in processing methods, a solid structure is generally used, making it difficult to achieve lightweight design, and the manufactured connecting ring is relatively heavy; fourth, after the operating temperature exceeds the Curie point, the thermal expansion system of the low-expansion alloy steel material increases sharply, posing a risk of cracking of the casing.

[0004] Therefore, this invention addresses the aforementioned technological status quo by proposing a design and manufacturing method for a connecting ring that meets comprehensive requirements such as structural strength, lightweight, and low expansion. Summary of the Invention

[0005] The purpose of this invention is to provide a lightweight, low-expansion connecting ring structure and manufacturing method for 3D printing. By changing the production method, material selection and structural design of the connecting ring, it overcomes the problems of long manufacturing cycle, high cost, inability to achieve both structural strength and lightweight, and easy expansion and cracking of the radome after connection with the antenna cover, which are inherent in traditional machining connecting rings.

[0006] To achieve the above objectives, the present invention provides a lightweight, low-expansion connecting ring structure for 3D printing, comprising:

[0007] Adhesive section, used for connection to the radome;

[0008] The base is integrally formed with the adhesive section and is located below the adhesive section for connection with the cabin body;

[0009] The adhesive section is a hollow conical ring; the taper of the conical ring is 2° to 5°; the wall thickness of the conical ring gradually increases from the end away from the base to the end connected to the base.

[0010] The base adopts a ring-shaped skin dot matrix structure; the skin dot matrix structure includes a hollow dot matrix structure and two layers of skin respectively disposed at the top and bottom of the dot matrix structure.

[0011] Optionally, the connection between the adhesive segment and the radome is achieved by adhesive bonding between the outer wall of the conical ring and the inner wall of the radome.

[0012] Optionally, the inner wall of the conical ring is provided with internal support ribs distributed in a diamond-shaped grid pattern.

[0013] Optionally, the inner support ribs include a plurality of first ribs and a plurality of second ribs; adjacent first ribs are distributed in parallel at a certain distance; adjacent second ribs are distributed in parallel at a certain distance; the first ribs and second ribs are arranged in a crisscross pattern to form a plurality of regularly arranged rhombuses.

[0014] Optionally, a plurality of buffer holes are provided on the conical ring, and the positions of the buffer holes correspond to the center points of each rhombus.

[0015] Optionally, the outer wall of the skin lattice structure is provided with a plurality of outer weight-reducing grooves; and its inner wall is provided with a plurality of inner weight-reducing grooves.

[0016] Optionally, the bottom of the skin lattice structure is provided with:

[0017] The connecting threaded holes are spaced at certain angles around the bottom of the skin lattice structure and can be connected to the cabin by installing double-ended studs;

[0018] The pin holes are symmetrically arranged radially with the center of the bottom as the center, and are used for circumferential positioning of the cabin.

[0019] Optionally, the height of the adhesive section is set to 60mm to 80mm; the wall thickness of the conical ring gradually increases from 0.3mm to 3mm from the end away from the base to the end connected to the base; and the distance between the buffer holes is set to 20mm to 40mm.

[0020] Optionally, the lightweight, low-expansion connecting ring structure is made of 4J36 or 4J40 low-expansion alloy steel.

[0021] This invention also provides a method for manufacturing a lightweight, low-expansion connecting ring for 3D printing, comprising the following steps:

[0022] Step S1: Construct the theoretical design model of the lightweight, low-expansion connecting ring;

[0023] Step S2: Based on the theoretical design model, a machining allowance is preset on the surface to be machined, and solid filling is performed at the positions of the connecting threaded holes and pin holes. An auxiliary positioning structure is reserved on the base to construct the billet process model.

[0024] Step S3: Selective laser melting technology is used to 3D print the above-mentioned blank process model;

[0025] Step S4: After removing the printing support, the preliminarily formed 3D printed connecting ring is subjected to stress-relieving heat treatment in air.

[0026] Step S5: Place the connecting ring on the milling fixture and perform finishing on the bottom plane of the base, the connecting threaded hole, and the pin hole;

[0027] Step S6: Place the connecting ring obtained in step S5 onto the turning fixture, and then perform finishing on the outer surface of the connecting ring.

[0028] Step S7: Place the connecting ring obtained in step S6 in a vacuum or nitrogen-protected environment for aging treatment.

[0029] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention provides a lightweight, low-expansion connecting ring structure for 3D printing. While meeting the requirements for mechanical strength, low expansion, and bonding, the overall weight is reduced by more than 30% compared with conventional connecting ring structures for machining, which is of great significance for the lightweighting of connecting rings.

[0031] 2. The present invention provides a lightweight, low-expansion connecting ring structure for 3D printing. The buffer groove reduces stress and strain caused by the mismatch of thermal expansion coefficients at high temperatures. When using 4J36 or 4J40 material, the overall working temperature can reach above 300°C. At the same time, the buffer groove can also improve the bonding reliability between the connecting ring and the radome.

[0032] 3. The present invention provides a manufacturing method for a lightweight, low-expansion connecting ring for 3D printing, which not only facilitates the 3D printing of the blank, but also makes it easy to achieve the finishing of the blank. The manufacturing difficulty and manufacturing cost are low. Compared with conventional machining methods, the manufacturing cycle can be shortened by more than 50%, and the manufacturing cost can be reduced by 10% to 20%. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the lightweight, low-expansion connecting ring for 3D printing according to the present invention.

[0034] Figure 2This is a front view of the lightweight, low-expansion connecting ring structure for 3D printing according to the present invention.

[0035] Figure 3 This is a cross-sectional view of the lightweight, low-expansion connecting ring structure for 3D printing according to the present invention.

[0036] Figure 4 This is a bottom view of the lightweight, low-expansion connecting ring structure for 3D printing according to the present invention.

[0037] Figure 5 This is a schematic diagram of the milling process for the lightweight, low-expansion connecting ring for 3D printing according to the present invention.

[0038] Figure 6 This is a schematic diagram of the turning process for the lightweight, low-expansion connecting ring for 3D printing according to the present invention. Detailed Implementation

[0039] The following will be combined with the appendix Figures 1-6 The technical content, structural features, objectives and effects of the present invention will be described in detail through preferred embodiments.

[0040] It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions. They are only used to facilitate and clarify the purpose of illustrating the embodiments of the present invention, and are not intended to limit the implementation conditions of the present invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationship, or adjustments to the size should still fall within the scope of the technical content disclosed in the present invention, provided that they do not affect the effects and objectives that the present invention can produce.

[0041] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] This invention provides a lightweight, low-expansion connecting ring structure and manufacturing method for 3D printing, such as... Figure 1 and Figure 2 As shown, the lightweight low-expansion connecting ring is used to achieve the transition connection between the radome 2 and the cabin. The lightweight low-expansion connecting ring includes two main bodies: an adhesive section 11, which refers to the upper section of the connecting ring, and the adhesive section 11 is connected to the radome 2 by adhesive bonding; and a base 12, which refers to the lower section of the connecting ring, is integrally formed with the adhesive section 11 and is located below the adhesive section 11. The base 12 is connected to the cabin by double-ended studs 3.

[0044] Among them, such as Figure 3 As shown, the adhesive segment 11 is a hollow conical ring 11a with a taper of 2° to 5°. The inner wall of the conical ring 11a is provided with inner support ribs 11b arranged in a diamond-shaped grid. Several buffer holes 11c are also provided on the conical ring 11a. By providing inner support ribs 11b arranged in a diamond-shaped grid on the inner wall, effective weight reduction of the adhesive segment 11, which is one of the main components of the connecting ring, is achieved without reducing the wall thickness, while simultaneously ensuring its structural strength.

[0045] Furthermore, the adhesive segment 11 is adhesively bonded to the inner wall of the radome, that is, the outer wall of the conical ring 11a is adhesively bonded to the inner wall of the radome. A bonding gap of 0.4mm to 0.6mm is maintained between the outer wall of the conical ring 11a and the inner wall of the radome; the height of the outer wall of the conical ring 11a used for bonding (that is, the height of the adhesive segment 11) is set to 60mm to 80mm.

[0046] The wall thickness of the conical ring 11a of the adhesive section 11 gradually increases from the end away from the base 12 to the end connected to the base 12 (i.e., from...). Figure 3 (As shown in the orientation relationship, from top to bottom, the difference between the inner and outer diameters of the conical ring 11a gradually increases.) Furthermore, the wall thickness of the conical ring 11a gradually increases from 0.3 mm to 3 mm. That is, at the end with the smaller inner diameter away from the base, the wall thickness of the conical ring 11a is 0.3 mm, and after gradually increasing in thickness, at the end with the larger inner diameter connected to the base, the wall thickness of the conical ring 11a reaches 3 mm.

[0047] The inner support rib 11b comprises several first ribs 11b1 and several second ribs 11b2. Adjacent first ribs 11b1 are arranged in parallel with a spacing of 20mm to 40mm, and adjacent second ribs 11b2 are also arranged in parallel with a spacing of 20mm to 40mm. The first ribs 11b1 and second ribs 11b2 are arranged in a crisscross pattern, forming several regularly arranged rhombuses. The horizontal included angle α of the first ribs 11b1 is 120° to 150°, and the horizontal included angle β of the second ribs 11b2 is 30° to 60°. The width of both the first ribs 11b1 and the second ribs 11b2 is 0.5mm to 0.8mm, and the protrusion height of both the first ribs 11b1 and the second ribs 11b2 on the inner wall of the conical ring 11a is 0.3mm to 0.5mm.

[0048] Furthermore, the buffer hole 11c opened on the conical ring 11a is located at the center point of each rhomboid region enclosed by the first rib 11b1 and the second rib 11b2; the buffer hole 11c is used to regulate the thermal expansion characteristics of the connecting ring and ensure the bonding reliability when bonding with the antenna cover 2.

[0049] Specifically, due to the significant difference in deformation between the connecting ring and the radome at high temperatures, the connecting ring will experience outward deformation and compressive force, thus posing a risk of cracking to the radome. The purpose of the buffer hole 11c is to absorb thermal stress and thermal deformation under high temperatures. By providing the buffer hole 11c on the connecting ring, some of the thermal stress and thermal deformation can be absorbed, thereby reducing the overall outward stress and strain of the connecting ring and effectively reducing the risk of radome cracking caused by the outward expansion of the connecting ring. In addition, the adhesive used during bonding contains air bubbles, and the buffer hole 11c can also expel these air bubbles during bonding, which helps to ensure the reliability of the bonding.

[0050] Furthermore, the lateral width of the buffer hole 11c is 1mm to 3mm, the longitudinal length is 10mm to 20mm, and the distance between two adjacent buffer holes 11c is 20mm to 40mm; under the aforementioned boundary conditions, the shape of the buffer hole 11c can be rectangular, waist-shaped, T-shaped, or X-shaped.

[0051] Among them, such as Figure 3 As shown, the base 12 adopts an annular skin lattice structure 12c with a certain wall thickness. The skin lattice structure 12c has high strength and rigidity and is a hollow structure. By designing the base 12 as a hollow skin lattice structure 12c, the weight of the base 12, which serves as the other main body of the connecting ring, can be effectively reduced.

[0052] The skin lattice structure 12c includes a lattice structure and two layers of skin respectively disposed at the top and bottom of the lattice structure. The lattice structure can have various hollow structural forms, including grid type, pyramid type, diamond arrangement type, Kagome type, etc.

[0053] The relative density of the lattice structure is 30% to 60%.

[0054] Among them, such as Figure 3 As shown, the outer wall of the skin lattice structure 12c is provided with several outer weight-reducing grooves 12b, each with a length of 25mm to 45mm, a width of 10mm to 15mm, and a depth of 8mm to 10mm; the inner wall of the skin lattice structure 12c is provided with several inner weight-reducing grooves 12a, each with a length of 40mm to 60mm, a width of 4mm to 8mm, and a depth of 15mm to 20mm. By adding outer weight-reducing grooves 12b and inner weight-reducing grooves 12a to the skin lattice structure 12c, the weight of the connecting ring is further reduced.

[0055] Preferably, to ensure the strength of the skin lattice structure 12c, the inner weight-reducing groove 12a and the outer weight-reducing groove 12b are staggered.

[0056] Furthermore, such as Figure 4 As shown, the bottom of the skin dot matrix structure 12c is provided with several connecting threaded holes 12d and pin holes 12e; the connecting threaded holes 12d are of size M5 to M6 and can be connected to the cabin by installing double-ended studs 3; the pin holes 12e are of diameter 4mm to 5mm and are used for circumferential positioning when connected to the cabin.

[0057] The threaded holes 12d are spaced at certain angles around the bottom of the skin lattice structure 12c; the pin holes 12e are symmetrically arranged radially with the center of the bottom as the center. Preferably, there are 4 sets of threaded holes 12d, which are evenly distributed around the bottom of the skin lattice structure 12c, that is, the threaded holes 12d in adjacent sets are spaced at 90° intervals; and each set of threaded holes 12d has 2 holes. For any two sets of threaded holes 12d in any opposite direction, the pin holes 12e are provided between the two threaded holes 12d in each set.

[0058] The usability of the lightweight, low-expansion connecting ring is primarily affected by its mechanical strength and thermal expansion properties, which can be controlled through certain structural parameters of the connecting ring. Therefore, the mechanical strength and thermal expansion properties of the connecting ring can be optimized by adjusting its structural parameters through simulation analysis.

[0059] Furthermore, to determine the lightweight structural parameters of the connecting ring, mechanical simulation analysis can be used to set the structural parameters of the conical ring 11a, inner support rib 11b, inner weight-reducing groove 12a, outer weight-reducing groove 12b, and the skin lattice structure 12c of the base 12. Specifically, by inputting material parameters including elastic modulus, Poisson's ratio, yield strength, tensile strength, density, and load conditions such as bending moment and axial force, the stress and strain of the above-mentioned different structural parameters under given load conditions are calculated, and the weight-reducing structural parameters are obtained under the boundary conditions of satisfying the maximum allowable stress and maximum allowable strain.

[0060] Furthermore, to ensure the connecting ring exhibits good low-expansion performance at high temperatures, the structural parameters of the conical ring 11a, the inner support rib 11b, and the buffer groove 11c can be adjusted through thermal simulation analysis. Specifically, by inputting parameters including the connecting ring's highest operating temperature and the material's coefficient of thermal expansion, the thermal expansion of the aforementioned structural parameters under a given temperature condition is calculated, and the optimal structural parameters under the condition of minimum thermal expansion are determined.

[0061] In a specific embodiment of the present invention, based on the analysis of the thermal expansion characteristics of the connecting ring material and the radome material, as shown in Table 1, to ensure the low expansion characteristics of the connecting ring and reduce the risk of radome cracking, the lightweight low-expansion connecting ring is made of 4J36 or 4J40 low-expansion alloy steel. The radome is made of quartz ceramic.

[0062] Table 1. Coefficients of thermal expansion of connecting ring material and radome material

[0063]

[0064] The lightweight, low-expansion connecting ring designed in this invention can be manufactured using 3D printing technology. During 3D printing of the connecting ring, a flange 12f (e.g., ...) is additionally provided at one end of the base 12 near the adhesive section 11 for auxiliary positioning. Figure 5 As shown), to facilitate clamping and positioning during milling; wherein, the thickness of the flange 12f is 4mm to 6mm, and the length of the flange protruding outward from the outer wall of the skin dot matrix structure 12c is 6mm to 8mm.

[0065] This invention also provides a method for manufacturing a lightweight, low-expansion connecting ring for 3D printing, comprising the following steps:

[0066] Step S1: Based on the simulation design, construct the theoretical design model of the lightweight, low-expansion connecting ring;

[0067] Step S2: Based on the theoretical design model, add a thickness of 0.3mm to 0.5mm to the outer contour surface to be machined as a machining allowance, and fill the connection threaded hole 12d and pin hole 12e with solids, and add a flange 12f on the base 12 to construct a blank process model for 3D printing.

[0068] Step S3: After the above preparations are completed, the above blank process model is 3D printed using selective laser melting technology; the laser power is 100W to 250W, the printing speed is 500mm / s to 800mm / s, and the printing layer thickness is 0.03mm to 0.05mm.

[0069] Step S4: After removing the printing support, the preliminarily formed 3D printed connecting ring is subjected to stress-relieving heat treatment in air; the heat treatment temperature is 300℃~500℃, and the heat treatment time is 4h~6h.

[0070] Step S5, using flange 12f as a clamping and positioning block, place the connecting ring on milling fixture 5 (e.g., Figure 5 As shown, the base 12 bottom plane, connecting threaded hole 12d, and pin hole 12e are pressed by the pressure plate device 4 and precision machined in one clamping condition.

[0071] Step S6: Using the bottom plane of base 12 as the clamping and positioning surface, place the connecting ring axially on the turning fixture 9 (e.g., ...). Figure 6 As shown, the turning fixture 9 is fixed by a three-jaw chuck 6; the connecting ring is circumferentially positioned by a positioning pin 8 that mates with the pin hole 12e, and axially locked by a fastening screw 7 that is screwed into the connecting thread hole 12d. The outer surface is finished in one clamping condition to obtain a lightweight, low-expansion connecting ring after finishing.

[0072] Step S7: Finally, the finely machined connecting ring is placed in a vacuum or nitrogen-protected environment for aging treatment to ensure the stability of the coefficient of thermal expansion; the heating temperature is 315±10℃, the holding time is 3h~6h, and it is cooled with the furnace.

[0073] In summary, the lightweight, low-expansion connecting ring structure and manufacturing method for 3D printing provided by this invention effectively meet the comprehensive requirements of lightweight, low expansion, ease of manufacturing, and stable performance. Multiple weight-reduction structures achieve excellent lightweight design while ensuring overall strength; by pre-setting a buffer groove at the connection point with the radome, the thermal expansion characteristics of the connecting ring are controlled, avoiding the problem of radome cracking due to mismatched thermal expansion coefficients between the connecting ring and the radome at high temperatures; by pre-setting a clamping structure on the 3D printed blank, the precision machining of the thin-walled complex structure blank is ensured; and by heat treatment after printing and after precision machining, internal stress is effectively eliminated and the stability of thermal expansion characteristics is guaranteed.

[0074] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A lightweight, low-expansion connecting ring structure for 3D printing, characterized in that, Include: The adhesive section (11) is used to connect to the radome (2); The base (12) is integrally formed with the adhesive section (11) and is located below the adhesive section (11) for connection with the cabin body; The adhesive section (11) is a hollow conical ring (11a); the taper of the conical ring (11a) is 2°~5°; the wall thickness of the conical ring (11a) gradually increases from the end away from the base (12) to the end connected to the base (12); The base (12) adopts an annular skin dot matrix structure (12c); the skin dot matrix structure (12c) includes a hollow dot matrix structure and two layers of skin respectively disposed at the top and bottom of the dot matrix structure. The inner wall of the conical ring (11a) is provided with inner support ribs (11b) distributed in a diamond grid pattern. The inner support rib (11b) includes a plurality of first ribs (11b1) and a plurality of second ribs (11b2); adjacent first ribs (11b1) are arranged in parallel at a certain distance; adjacent second ribs (11b2) are arranged in parallel at a certain distance; the first ribs (11b1) and second ribs (11b2) are arranged in a crisscross pattern to form a plurality of regularly arranged rhombuses; The conical ring (11a) has several buffer holes (11c) and the positions of the buffer holes (11c) correspond to the center points of each rhombus. The height of the adhesive section (11) is set to 60mm~80mm; the wall thickness of the conical ring (11a) gradually increases from 0.3mm to 3mm from the end away from the base to the end connected to the base; the distance between the buffer holes (11c) is set to 20mm~40mm.

2. The lightweight, low-expansion connecting ring structure as described in claim 1, characterized in that, The connection between the adhesive section (11) and the radome (2) is achieved by adhesive bonding between the outer wall of the conical ring (11a) and the inner wall of the radome (2).

3. The lightweight, low-expansion connecting ring structure as described in claim 1, characterized in that, The outer wall of the skin lattice structure (12c) is provided with a plurality of outer weight reduction grooves (12b); the inner wall is provided with a plurality of inner weight reduction grooves (12a).

4. The lightweight, low-expansion connecting ring structure as described in claim 1, characterized in that, The bottom of the skin lattice structure (12c) is provided with: The connecting threaded hole (12d) is spaced at a certain angle around the bottom of the skin lattice structure (12c), and can be connected to the cabin by installing a double-headed stud (3); The pin holes (12e) are symmetrically arranged on the radial direction with the center of the bottom as the center, and are used for circumferential positioning of the cabin.

5. The lightweight, low-expansion connecting ring structure as described in claim 1, characterized in that, It is made of 4J36 or 4J40 low expansion alloy steel.

6. A method for manufacturing a lightweight, low-expansion connector ring for 3D printing, comprising using the lightweight, low-expansion connector ring structure as described in any one of claims 1 to 5, characterized in that, Includes the following steps: Step S1: Construct the theoretical design model of the lightweight, low-expansion connecting ring; Step S2: Based on the theoretical design model, a machining allowance is preset on the surface to be machined, and solid filling is performed at the positions of the connecting threaded hole (12d) and the pin hole (12e). An auxiliary positioning structure is reserved on the base (12) to construct the billet process model. Step S3: Selective laser melting technology is used to 3D print the above-mentioned blank process model; Step S4: After removing the printing support, the preliminarily formed 3D printed connecting ring is subjected to stress-relieving heat treatment in air. Step S5: Place the connecting ring on the milling fixture and perform finishing on the bottom plane of the base (12), the connecting thread hole (12d), and the pin hole (12e); Step S6: Place the connecting ring obtained in step S5 onto the turning fixture, and then perform finishing on the outer surface of the connecting ring. Step S7: Place the connecting ring obtained in step S6 in a vacuum or nitrogen-protected environment for aging treatment.

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