A sealing ring material and its preparation method

Abstract

This invention relates to a sealing ring material and its preparation method, belonging to the field of non-ferrous metal processing. The sealing ring material is composed of the following metallic elements: Bi: 1–10 wt%, Ag: 1–5%, Cu: 0.1–1.0 wt%, Pb: 1 × 10⁻⁶. ‑3 ~3×10 ‑3 wt%, Co: 1×10 ‑4 wt% ~ 10×10 ‑4 wt%, Be: 1×10 ‑4 wt% ~ 5×10 ‑4 wt%, Ni: 1×10 ‑4 wt% ~ 5×10 ‑4 wt%, Sn: balance. Prepared using a continuous casting, extrusion, machining, and integrated forming method. The sealing ring material of this invention has a uniform composition and possesses properties such as high and low temperature resistance, good resilience, oxidation resistance, and wear resistance; simultaneously, the sealing ring also exhibits good aging resistance, high adaptability to sealing media, and high reliability; and demonstrates excellent service capability under high and low temperature conditions, making it suitable for mass production.

Description

Technical Field

[0001] This invention relates to a sealing ring material and its preparation method, which is mainly used as a key sealing component for the refrigeration unit of infrared detector equipment in airborne, shipborne, armored vehicle, security and temperature measurement projects. It belongs to the field of non-ferrous metal processing, especially metallurgy and rolling processing. Background Technology

[0002] Stirling refrigeration differs entirely from traditional vapor compression throttling refrigeration. It utilizes the periodic expansion and compression of high-pressure helium gas within a cylinder to generate cooling capacity. Therefore, compared to traditional refrigeration, Stirling refrigeration offers advantages such as being green, environmentally friendly, energy-efficient, and highly effective. However, its manufacturing and assembly processes face numerous challenges, one of which is ensuring the proper sealing of the high-pressure helium gas within the cylinder. This is crucial for the refrigeration unit's cooling efficiency and mean time between maintenance (MTBG) performance.

[0003] First, helium is one of the smallest gases in terms of atomic size (second only to hydrogen), and it has extremely high penetrability, making it particularly difficult to seal. The equipment operates at high pressure (3-5 MPa), requiring the sealing rings to maintain good sealing performance within a temperature range of -70℃ to 120℃. The groove materials used with the sealing rings are aluminum alloy and ceramic. Various commonly used sealing rings, such as rubber O-rings, PTFE gaskets, and pure silver wire, have been tried, but none have met the requirements or provided adequate sealing stability. The thermal expansion of rubber O-rings and aluminum alloys is clearly not on the same order of magnitude; after each temperature cycle, gaps appear in the tight fit, leading to gas leakage. PTFE materials also present the same problem. While the leakage rate of pure silver wire initially meets the requirements, subsequent measurements show a gradual increase in leakage rate, especially noticeable under system vibration or other impacts.

[0004] Currently, sealing rings are generally made of nickel-based alloys with a 30-50µm thick layer of soft metal (such as silver, nickel, copper, aluminum, or tin) electroplated on the outside. Although these materials have good high and low temperature resistance and resilience, it is still necessary to improve the sealing ring materials and processing methods, and seek better materials and forming methods. Summary of the Invention

[0005] The main objective of this invention is to provide a sealing ring material that can be used as a key sealing component in refrigeration equipment. This material has uniform composition, precise dimensions, resistance to high and low temperatures, and high adaptability and reliability to sealing media.

[0006] Another objective of this invention is to provide a method for preparing a sealing ring. This invention employs continuous casting, extrusion, machining, and integrated forming techniques. This method is simple and easy to operate, overcoming the problems of difficulty in forming soft solder metal and low metal strength. It produces sealing ring materials with uniform composition, high dimensional accuracy, high reliability, and low leakage rate, suitable for mass production. This method can be widely applied to the preparation of key sealing components in various refrigeration equipment, providing a reference for the preparation of other sealing materials.

[0007] Another object of the present invention is to provide the application of the sealing ring material in the refrigerator of infrared detector equipment in airborne, shipborne, armored vehicle, security and temperature measurement projects.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A sealing ring material, the alloy being composed of the following metallic elements: Bi: 1~10wt%, Ag: 1~5%, Cu: 0.1~1.0wt%, Pb: 1×10 -3 ~3×10 -3 wt%, Co: 1×10 -4 wt%~10×10 -4 wt%, Be: 1×10 -4 wt%~5×10 -4 wt%, Ni: 1×10 -4 wt%~5×10 -4 wt%, Sn: Balance.

[0010] The preferred content of Bi is 3-8 wt%, the preferred content of Ag is 3-5%, the preferred content of Cu is 0.5-1.0 wt%, and the preferred content of Co is 3 × 10⁻⁶ wt%. -4 wt%~5×10 -4 The preferred content of Be is 1×10⁻⁶ wt%. -4 wt%~3×10 -4 The preferred Ni content is 1×10 wt%. -4 wt%~3×10 -4 wt%.

[0011] Preferably, the sealing ring material has the following composition: Bi: 3~8wt%, Ag: 3~5%, Cu: 0.5~1.0wt%, Pb: 1×10⁻⁶. -3 ~3×10 -3 wt%, Co: 3×10 -4 wt%~5×10 -4 wt%, Be: 1×10 -4 wt%~3×10 -4 wt%, Ni: 1×10-4 wt%~3×10 -4 wt%, Sn: Balance.

[0012] Preferably, the finished sealing ring has an outer diameter of 15mm to 300mm, a wall thickness of 1 to 5mm, and a width of 1 to 5mm; the ring cross-section is C-shaped.

[0013] More preferably, the finished size of the sealing ring is 15mm~40mm in outer diameter, 1-3mm in wall thickness, and 2-3mm in width.

[0014] This invention utilizes the addition of Cu and Bi elements to enable age-hardening of alloy materials. The precipitation of Cu3Sn and Cu6Sn5 phases effectively improves the material's strength and electrical conductivity, while also enhancing its mechanical and electrical properties. Therefore, aging treatment can be performed after processing to obtain superior performance more suitable for the application environment.

[0015] Adding Ni improves the reliability and corrosion resistance of the material. It also enhances the material's machinability and corrosion resistance, resulting in a longer service life under complex operating environments. Adding Co improves the heat resistance and high-temperature resistance of the alloy material.

[0016] A method for preparing a sealing ring material, employing continuous casting, extrusion, machining, and integral forming methods, includes the following steps:

[0017] (1) Material preparation: Bismuth, silver, copper, lead, cobalt, beryllium, nickel and tin are used as raw materials;

[0018] (2) Continuous casting: The prepared raw materials are weighed according to the mass percentage of the alloy composition and placed into a continuous casting furnace. Medium frequency induction melting is used. After the metal is fully melted, it is continuously cast into rod-shaped ingots.

[0019] (3) Extrusion: The continuously cast rod-shaped ingot is used to prepare the pipe by continuous extrusion. During the extrusion process, a certain temperature and speed are selected to ensure the accuracy and uniformity of the forming. Therefore, the extrusion temperature should be controlled at 220℃~250℃ and the extrusion speed should be controlled at 10mm / s~20mm / s. The final product is a pipe blank with an outer wall diameter of 15mm~40mm and a wall thickness of 1mm~5mm.

[0020] (4) Machining: Machining the tube blank into a ring with a width of 1~10mm and then performing surface treatment;

[0021] (5) Integrated forming: The machined metal ring is integrally formed using a mold; the resulting product dimensions are an outer diameter of 15mm~40mm, a wall thickness of 1~5mm, a width of 1~5mm, and a chamfer of R0.35~0.55; the integrated forming extrusion mold is designed according to the finished product dimensions, with the outer chamfer between R0.55~0.65 and the inner chamfer between R0.3~0.5, which can reduce the deformation resistance and obtain a better demolding effect, ultimately obtaining accurate finished product dimensions.

[0022] In step (1), the following materials are selected as raw materials: bismuth with a purity of 99.99wt%, silver with a purity of 99.99wt%, oxygen-free copper (preferably oxygen-free copper with the grade TU1), lead with a purity of 99.5wt%, cobalt with a purity of 99.5wt%, beryllium beads with a purity of 99.5wt%, nickel with a purity of 99.99wt%, and tin with a purity of 99.99wt%.

[0023] In step (2), the preferred mass percentages of the alloy raw materials are: Bi: 3~8wt%, Ag: 3~5wt%, Cu: 0.5~1.0wt%, Pb: 1×10 -3 ~3×10 -3 wt%, Co: 3×10 -4 wt%~5×10 -4 wt%, Be: 1×10 -4 wt%~3×10 -4 wt%, Ni: 1×10 -4 wt%~3×10 -4 wt%, Sn: Balance.

[0024] The smelting temperature is 300℃~350℃, charcoal covering is used, and the casting speed is 1~5 mm / s. The diameter of the rod-shaped ingot is 15~45 mm.

[0025] In step (3), the rod-shaped ingot needs to be heat-treated before extrusion. By using a solid solution strengthening heat treatment method, residual stress and distortion in the alloy are reduced or eliminated, improving machinability and deformation capacity, which facilitates subsequent extrusion forming. The heat treatment temperature is 150~180℃, and the holding time is 1~3 hours.

[0026] In step (3), the pipe needs to be rapidly cooled in a cooling tank after extrusion. That is, after extrusion, it is quickly transported to the cooling tank through a cooling pipe for cooling to avoid the formation of a hard skin on the surface of the product. At the same time, it is necessary to avoid the alloy pipe being too fragile or excessively deformed, which would affect subsequent processing steps.

[0027] In step (4), the cutting fluid used during machining should be a water-based oil-based cutting fluid containing self-lubricating particles to ensure lubrication.

[0028] In step (5), the mold is strictly selected according to the dimensions to obtain accurate finished product dimensions. During the stamping process, the extrusion pressure is controlled between 0 and 50 N, preferably between 20 and 50 N, and the mold clearance is within ±0.5 mm.

[0029] The sealing ring described in this invention is used in the manufacture of cryogenic refrigeration equipment, which is a key sealing structure of the refrigeration unit equipped with an infrared detector.

[0030] The beneficial effects of this invention are:

[0031] This invention designs the composition of sealing materials by adding trace elements to tin alloys to synergistically control the material's microstructure, overall performance, and service performance. By doping with Cu, the alloy material undergoes age-hardening, effectively improving its strength and mechanical properties. The presence of Co enhances the alloy's heat resistance and high-temperature resistance. The synergistic effect of combining two or more elements such as Ag, Cu, Pb, Bi, and Ni significantly improves the sealing material's resistance to high and low temperatures, resilience, oxidation resistance, and wear resistance.

[0032] The sealing ring of this invention possesses advantages such as high reliability, aging resistance, high adaptability to sealing media, and low leakage rate, effectively meeting the needs of sealing rings in the field of cryogenic refrigeration equipment encapsulation and sealing. Furthermore, the manufacturing process improves the surface cleanliness of the sealing ring, ensuring the final product's performance. Integrated manufacturing of the sealing ring facilitates dimensional consistency, performance uniformity, and stability. Simultaneously, optimized process flow increases product yield, achieving a yield rate as high as 99%, saving significant time and costs.

[0033] The sealing ring of this invention is manufactured using a continuous casting, extrusion, machining, and integrated forming method. The manufacturing process has no environmental impact and enables automated, mass production. It meets the requirements for sealing applications in cryogenic refrigeration systems. Attached Figure Description

[0034] Figure 1 This is an exploded view of the integrated forming and extrusion equipment used for the sealing ring of this invention;

[0035] Figure 2 This is a cross-sectional view of the sealing ring during extrusion according to the present invention;

[0036] Figure 3 This is a schematic diagram of the sealing ring after extrusion of the present invention.

[0037] Explanation of key figure labels:

[0038] 1-Extrusion cover plate, 2-Extrusion expansion and contraction shaft, 3-Material ring blank, 4-Extrusion die, 5-Intermediate sleeve. Detailed Implementation

[0039] The sealing material and its preparation method of the present invention will be further described below with reference to specific preparation examples.

[0040] The sealing material in the following embodiments is prepared by the following method, specifically including the following steps:

[0041] Step 1: Raw material selection

[0042] Oxygen-free copper (preferably TU1 grade), beryllium beads with a purity of 99.5 wt%, lead with a purity of 99.5 wt%, nickel with a purity of 99.99 wt%, tin with a purity of 99.99 wt%, silver with a purity of 99.99 wt%, and cobalt with a purity of 99.5 wt%.

[0043] Weigh the raw materials according to the mass percentage of each component, and prepare the total weight in the range of 3.5kg to 5.0kg.

[0044] Step 2: Continuous casting

[0045] 1) Equipment: Non-vacuum medium-frequency induction furnace, horizontal continuous casting machine;

[0046] 2) Ingredient preparation: Calculate the raw materials according to the component ratio and put them into a graphite crucible;

[0047] 3) Heating temperature: 300℃~350℃;

[0048] 4) Casting speed: 1~5mm / s;

[0049] 5) Mold size: Rod mold with a diameter of 15~45mm.

[0050] 6) Operation: After placing the material into the crucible, begin heating. The heating process should be slow, with the power increased in steps; do not directly adjust to high power. Once the metal is fully melted, add charcoal as a covering agent. After refining for 3-5 minutes, begin casting.

[0051] Step 3: Extrusion

[0052] 1) Equipment: Soft wire extrusion press;

[0053] 2) Extrusion temperature: 220℃~250℃;

[0054] 3) Extrusion speed: 10mm / s~20mm / s;

[0055] 4) Mold dimensions: outer diameter: 15mm~40mm; wall thickness: 1~5mm.

[0056] 5) Operation: The rod-shaped ingot is first heat-treated using a solution-strengthened heat treatment method at a temperature of 150~180℃ for 1~3 hours. The heat-treated material is then placed into a mold, and the equipment is heated to 200℃~220℃ for extrusion. The initial extrusion speed is set to a low speed of 10mm / s, and the medium speed is adjusted according to the material after extrusion. After producing a fixed length of round tube, rapid cooling is performed (the extruded tube is promptly transported to a cooling tank via cooling pipes for initial cooling of the high-temperature tube, followed by further cooling in the cooling tank) and then cut.

[0057] Step 4: Machining

[0058] 1) Equipment: Slow wire EDM machine;

[0059] 2) Cutting speed: 100~200mm / min;

[0060] 2) Discharge time: 1ms~10ms;

[0061] 3) Gap time: 20ms~50ms;

[0062] 4) Operation: After the equipment is calibrated, the workpiece is clamped, the pipe is mounted on the equipment, tool setting and measurement are performed, the position is determined, and the program is entered and edited according to the dimensions. The process parameters are adjusted, and machining begins after confirmation before processing. Finally, the pipe is machined into individual rings. The cutting fluid used is a water-based oil-based cutting fluid with added self-lubricating particles.

[0063] Step 5: Integrated molding

[0064] 1) Equipment: Sealing ring stamping equipment;

[0065] like Figure 1-3 As shown, the integrated forming equipment mainly consists of an extrusion cover plate 1, an extrusion expansion and contraction shaft 2, an extrusion die 4, and an intermediate sleeve 5. Sealing rings of different sizes require different die specifications. To ensure product dimensions, the process parameter to be controlled is the die clearance, which should be within ±0.5mm.

[0066] The stamping steps are as follows: use tweezers to place the cut ring blank 3 into the extrusion die 4, set the extrusion pressure, and perform expansion and contraction stamping from the inside out. After completion, use tweezers to remove the material and perform the next sealing ring forming stamping.

[0067] 2) Operation: Adjust the extrusion pressure, die, and other parameters of the stamping equipment according to the required shape of the sealing ring. The integrated forming extrusion die is designed according to the finished product size, with the outer chamfer between R 0.55 and 0.65 and the inner chamfer between 0.3 and 0.5. Install the required die on the die holder of the stamping machine, and place the prepared metal ring into the feeding mechanism of the stamping equipment for sealing ring forming. During the stamping process, it is necessary to monitor the extrusion pressure and die clearance. Extrusion pressure: 0~50N; Die clearance: ±0.5mm, and adjust the parameters in time to ensure the finished product size. The sealing ring of this invention is mainly used to prepare the key sealing structure of cryogenic refrigeration equipment.

[0068] Example 1: Preparation of a sealing ring with a diameter of φ20×φ18

[0069] The designed furnace capacity is 3.5 kg.

[0070] 3.26 kg of Sn, 0.011 g of Be and Ni, 0.018 g of Co, 0.02 kg of Cu, 0.12 kg of Bi and Ag, and 0.08 g of Pb were weighed and placed into a graphite crucible in a non-vacuum melting furnace. Medium-frequency induction melting was used. After the metals were fully melted, a covering agent was added. The melting temperature was 320℃, and the casting speed was 2.5 mm / s. A billet with a diameter of 20 mm and a length of approximately 1.5 m was cast.

[0071] The prepared billet is placed into a mold with an outer diameter of 20mm and an inner diameter of 18mm for extrusion. The equipment is heated to 220℃ and extrusion is carried out after reaching the temperature. The initial extrusion speed is set to low speed of 10mm / s, and the medium speed extrusion speed is adjusted according to the material after extrusion. After producing 200mm, it is rapidly cooled and cut.

[0072] The cut round tube is mounted onto a slow wire EDM machine for tool setting and measurement. The position is determined, and the program is entered and edited according to the dimensions. The parameters are adjusted as follows: cutting speed: 200mm / min, discharge time: 8ms, gap time: 400ms; water pressure: 15Pa. Finally, a ring with an outer diameter of 20mm, an inner diameter of 18mm, and a width of 2mm is obtained.

[0073] Based on the required sealing ring size, install the necessary mold on the mold base of the stamping machine, and adjust the extrusion pressure of the stamping equipment to 35N and the mold clearance to ±0.5mm. Then, place the prepared ring with an outer diameter of 20mm, an inner diameter of 18mm, and a width of 2mm into the feeding mechanism of the stamping equipment for sealing ring forming, and finally obtain a finished sealing ring with an outer diameter of 20mm and an inner diameter of 18mm.

[0074] Example 2: Preparation of a sealing ring with a diameter of φ29mm × φ26mm

[0075] The designed furnace capacity is 5.0 kg.

[0076] 4.67 kg of Sn, 0.015 g of Be and Ni, 0.025 g of Co, 0.028 kg of Cu, 0.155 kg of Bi and Ag, and 0.00012 kg of Pb were weighed and placed into a graphite crucible in a non-vacuum melting furnace. Medium-frequency induction melting was used. After the metals were fully melted, a covering agent was added. The melting temperature was 320℃, and the casting speed was 2.5 mm / s. A billet with a diameter of 29 mm and a length of approximately 1.0 m was cast.

[0077] The prepared billet is placed into a mold with an outer diameter of 29mm and an inner diameter of 26mm for extrusion. The equipment is heated to 220℃ and extrusion is carried out after reaching the temperature. The initial extrusion speed is set to low speed of 10mm / s, and the medium speed extrusion speed is adjusted according to the material after extrusion. After producing 200mm, it is rapidly cooled and cut.

[0078] The cut round tube is mounted onto a slow wire EDM machine for tool setting and measurement. The position is determined, and the program is entered and edited according to the dimensions. The parameters are adjusted as follows: cutting speed: 200 mm / min, discharge time: 8 ms, gap time: 400 ms; water pressure: 15 Pa. Finally, a ring with an outer diameter of 29 mm, an inner diameter of 26 mm, and a width of 2 mm is obtained.

[0079] Based on the required sealing ring size, install the necessary mold on the mold base of the stamping machine, and adjust the extrusion pressure of the stamping equipment to 48N and the mold clearance to ±0.5mm. Then, place the prepared ring with an outer diameter of 29mm, an inner diameter of 26mm, and a width of 2mm into the feeding mechanism of the stamping equipment for sealing ring forming, and finally obtain a finished sealing ring with an outer diameter of 29mm and an inner diameter of 26mm.

[0080] Example 3: Preparation of a sealing ring with a diameter of φ20mm × φ18mm

[0081] The designed furnace capacity is 4.0 kg.

[0082] 3.6 kg of Sn, 0.012 g of Be and Ni, 0.015 g of Co, 0.028 kg of Cu, 0.188 kg of Bi, 0.18 kg of Ag, and 0.12 g of Pb were weighed and placed into a graphite crucible in a non-vacuum melting furnace. Medium-frequency induction melting was used. After the metals were fully melted, a covering agent was added. The melting temperature was 320℃, and the casting speed was 2.5 mm / s. A billet with a diameter of 20 mm and a length of approximately 1.5 m was cast.

[0083] The prepared billet is placed into a mold with an outer diameter of 29mm and an inner diameter of 26mm for extrusion. The equipment is heated to 220℃ and extrusion is carried out after reaching the temperature. The initial extrusion speed is set to low speed of 10mm / s, and the medium speed extrusion speed is adjusted according to the material after extrusion. After producing 200mm, it is rapidly cooled and cut.

[0084] The cut round tube is mounted onto a slow wire EDM machine for tool setting and measurement. The position is determined, and the program is entered and edited according to the dimensions. The parameters are adjusted as follows: cutting speed: 200mm / min, discharge time: 8ms, gap time: 400ms; water pressure: 15Pa. Finally, a ring with an outer diameter of 20mm, an inner diameter of 18mm, and a width of 2mm is obtained.

[0085] Based on the required sealing ring size, install the necessary mold on the mold base of the stamping machine, and adjust the extrusion pressure of the stamping equipment to 35N and the mold clearance to ±0.5mm. Then, place the prepared ring with an outer diameter of 20mm, an inner diameter of 18mm, and a width of 2mm into the feeding mechanism of the stamping equipment for sealing ring forming, and finally obtain a finished sealing ring with an outer diameter of 20mm and an inner diameter of 18mm.

[0086] Table 1. Composition (wt.%) of sealing rings prepared in Examples 1-3

[0087]

[0088] Table 2 Test performance of sealing rings prepared in Examples 1-3

[0089]

[0090] The sealing rings prepared using this method have a smooth, burr-free surface. Dimensions: outer diameter 15mm~40mm, wall thickness 1~5mm, width 1~5mm. Tensile strength: 150~350N / mm². 2 Elongation: 35-45%. Experimental results show that the sealing ring prepared by this invention has precise dimensions and the material properties meet the requirements for use.

[0091] The sealing rings prepared using the method of this invention can be continuously cast, extruded, machined, integrally formed, and processed in a streamlined process. They exhibit uniform material properties, a smooth, burr-free surface, and meet dimensional requirements with precise specifications. This product has broad market prospects. The preparation method boasts a high degree of automation, high production efficiency, and is suitable for mass production.

[0092] The sealing ring material of this invention is mainly used in key sealing components of cryogenic refrigeration equipment. This sealing ring material has a uniform composition and possesses properties such as high and low temperature resistance, good resilience, oxidation resistance, and wear resistance. It is prepared using a continuous casting, extrusion, machining, and integrated molding method.

[0093] Commonly used sealing rings have a coating on their surface. The metal sealing ring prepared by this method eliminates the need for a metal coating, the processing method is simple, and there are no environmental problems. At the same time, the sealing ring also has good aging resistance, high adaptability to sealing media, and high reliability. Furthermore, it has good service capability under high and low temperature conditions and is suitable for mass production.

[0094] The above embodiments are merely examples of the sealing ring preparation method of the present invention. In the above technical solutions of the present invention, the sealing ring mold size, extrusion speed, extrusion temperature, cutting speed, discharge time, gap time, etc. can be freely selected within the specified range, and will not be listed one by one here. Therefore, the technical solutions contained in the above description should be regarded as illustrative and not used to limit the protection scope of the present invention.

Claims

1. A method for preparing a sealing ring material, characterized in that: Composed of the following metallic elements Composition: Bi: 1 - 10 wt%, Ag: 1 - 5%, Cu: 0.1 - 1.0 wt%, Pb: 1×10 -3 ~3×10 -3 wt%, Co: 1×10 -4 wt% - 10×10 -4 wt%, Be: 1×10 -4 wt% - 5×10 -4 wt%, Ni: 1×10 -4 wt% - 5×10 -4 wt%, Sn: the balance; Includes the following steps: (1) Material preparation: Bismuth, silver, copper, lead, cobalt, beryllium, nickel and tin are used as raw materials; (2) Continuous casting: The prepared raw materials are weighed according to the mass percentage of the alloy composition and placed into a continuous casting furnace. Medium frequency induction melting is used. After the metal is fully melted, it is continuously cast into rod-shaped ingots. (3) Extrusion: The continuously cast rod-shaped ingot is used to prepare the pipe by continuous extrusion. During the extrusion process, a certain temperature and speed are selected to ensure the accuracy and uniformity of the forming. Therefore, the extrusion temperature should be controlled at 220℃~250℃ and the extrusion speed should be controlled at 10mm / s~20mm / s. The final product is a pipe blank with an outer wall diameter of 15mm~40mm and a wall thickness of 1mm~5mm. (4) Machining: Machining the tube blank into a ring with a width of 1~10mm and then performing surface treatment; (5) Integrated forming: The machined metal ring is integrally formed using a mold; the resulting product dimensions are an outer diameter of 15mm~40mm, a wall thickness of 1~5mm, a width of 1~5mm, and a chamfer of R0.35~0.55; the integrated forming extrusion mold is designed according to the finished product dimensions, with the outer chamfer between R0.55~0.65 and the inner chamfer between R0.3~0.5, which can reduce the deformation resistance and obtain a better demolding effect, ultimately obtaining accurate finished product dimensions.

2. The method for preparing the sealing ring material according to claim 1, characterized in that: The content of Bi is 3-8 wt%, the content of Ag is 3-5%, the content of Cu is 0.5-1.0 wt%, and the content of Co is 3 × 10⁻⁶. -4 wt%~5×10 -4 The content of Be is 1×10 wt%. -4 wt%~3×10 -4 The Ni content is 1×10 wt%. -4 wt%~3×10 -4 wt%.

3. The method for preparing the sealing ring material according to claim 1, characterized in that: The finished dimensions of the sealing ring are as follows: outer diameter 15mm~300mm, wall thickness 1~5mm, and width 1~5mm; the cross-section of the ring is C-shaped.

4. The method for preparing the sealing ring material according to claim 1, characterized in that: The raw materials used are: bismuth with a purity of 99.99wt%, silver with a purity of 99.99wt%, oxygen-free copper, lead with a purity of 99.5wt%, cobalt with a purity of 99.5wt%, beryllium beads with a purity of 99.5wt%, nickel with a purity of 99.99wt%, and tin with a purity of 99.99wt%.

5. The method for preparing the sealing ring material according to claim 1, characterized in that: The smelting temperature is 300℃~350℃, covered with charcoal, and the casting speed is 1~5 mm / s; the diameter of the rod-shaped ingot is 15~45mm.

6. The method for preparing the sealing ring material according to claim 1, characterized in that: Before extrusion, the rod-shaped ingot is heat-treated using a solution-strengthened heat treatment method. The heat treatment temperature is 150~180℃ and the holding time is 1~3 hours.

7. The method for preparing the sealing ring material according to claim 1, characterized in that: The pipe is rapidly cooled in a cooling tank after extrusion; during machining, the cutting fluid used is a water-based oil-based cutting fluid containing self-lubricating particles; during the stamping process, the extrusion pressure is controlled between 35 and 50 N, and the die gap is within ±0.5 mm.

8. A sealing ring material, characterized in that: It is prepared by any one of claims 1-7.

9. The sealing ring material according to claim 8 is used in the preparation of cryogenic refrigeration equipment.

10. The application according to claim 9, characterized in that: The aforementioned cryogenic refrigeration equipment is a sealed structure of a refrigeration unit equipped with an infrared detector.

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