A method for preparing a sealing ring made of a high-elasticity high-temperature alloy and a sealing ring

Abstract

The present invention provides a method for preparing a sealing ring made of a high-elasticity high-temperature alloy material and a sealing ring, which relate to the field of gas path sealing. The preparation method comprises: processing a disc made of a high-elasticity high-temperature alloy material; annealing the disc; stretching and cutting the annealed disc to form an annular blank; annealing the blank; hydraulically expanding the annealed blank and removing the excess to form a sealing ring; and aging the sealing ring. The existing age-hardening nickel-based deformable high-temperature alloy is replaced by a high-elasticity high-temperature alloy, so that the prepared sealing ring has sufficient elasticity and high-temperature sealing performance. First, the disc is annealed to eliminate the internal stress of the disc and regulate the grain structure of the material. Then, the blank is annealed to eliminate the local stress formed during the tensile deformation of the disc and reduce the crystal defect density inside the material, so as to facilitate the subsequent hydraulic expansion process and finally smoothly process the high-elasticity high-temperature alloy into a sealing ring.

Description

Technical Field

[0001] The present invention relates to the field of gas path sealing, and in particular to a method for preparing a sealing ring made of a high-elasticity high-temperature alloy and the sealing ring. Background Art

[0002] Metal sealing rings are a type of axial, self-tightening static seal with a novel sealing form and excellent sealing performance. Made of alloy, their cross-section typically exhibits a "W," "M," or more complex, multi-corrugated shape. They offer excellent resilience, vibration absorption, a wide deformation range, excellent vibration tracking, and strong wear resistance. They are particularly well-suited for operation in harsh environments such as high temperature, high pressure, vibration, and highly corrosive media. In recent years, they have been widely used in the air path sealing of aircraft engines.

[0003] There are two common processes for forming metal seals: roll forming and hydroforming. Taking hydroforming as an example, existing aircraft engine metal seals are typically made from age-hardening nickel-based deformable high-temperature alloys such as national standard GH4169 and GH738.

[0004] These alloys have high tensile strength and significant work hardening. However, during hydroforming, blanks made from these alloys are prone to uneven deformation of the seal ring due to localized stress concentration. Furthermore, the material often contains numerous deformation defects (such as dislocations, deformation twins, and stacking faults). This can lead to insufficient elasticity and substandard high-temperature sealing performance in the resulting metal seal ring, making it unable to meet the service requirements of aircraft engine sealing devices. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, one of the objectives of the present invention is to provide a method for preparing a sealing ring made of a high-elasticity high-temperature alloy.

[0006] The present invention provides the following technical solutions:

[0007] A method for preparing a sealing ring made of a high-elasticity high-temperature alloy material, comprising:

[0008] Obtaining a disc made of a high-elasticity high-temperature alloy;

[0009] annealing the wafer;

[0010] stretching and cutting the annealed disc to form a ring-shaped blank;

[0011] annealing the blank;

[0012] The annealed blank is subjected to hydraulic bulging and excess is removed to form a sealing ring;

[0013] The sealing ring is subjected to aging treatment.

[0014] As a further optional solution to the method for preparing a sealing ring made of a high-elasticity high-temperature alloy, the annealing of the wafer includes:

[0015] The wafer is placed in a vacuum furnace for annealing at a temperature of 925±10°C for 10±1 min;

[0016] The wafer is subjected to a water cooling treatment.

[0017] As a further optional solution to the method for preparing a sealing ring made of a high-elasticity high-temperature alloy, the annealing of the blank comprises:

[0018] The blank is placed in a vacuum furnace for annealing at a temperature of 940±10°C and a holding time of 20±1min;

[0019] The blank is subjected to water cooling treatment.

[0020] As a further optional solution to the method for preparing a sealing ring made of a high-elasticity high-temperature alloy, the aging treatment of the sealing ring includes:

[0021] Place the sealing ring in a vacuum furnace at a temperature of 495±5°C for 120±2 minutes;

[0022] The sealing ring is subjected to air cooling treatment.

[0023] As a further optional solution to the method for preparing a sealing ring made of a high-elasticity high-temperature alloy, the thickness of the disc is 0.2-0.35 mm.

[0024] As a further optional solution to the method for preparing a sealing ring made of a high-elasticity high-temperature alloy, the annealed disc is stretched and cut to form an annular blank, comprising:

[0025] The disc is stretched to form a cylindrical first workpiece, wherein one end of the first workpiece is closed and the other end is open;

[0026] stretching the first workpiece to form a second workpiece;

[0027] stretching the second workpiece to form a third workpiece;

[0028] The third workpiece is cut at both ends along the axial direction to form the annular blank.

[0029] As a further optional solution to the method for preparing a high-elasticity high-temperature alloy sealing ring, the diameter of the disc is 30.0 mm, the outer diameter of the first processed part is 16.5 mm, the outer diameter of the second processed part is 13.0 mm, and the outer diameter of the third processed part is 9.8 mm.

[0030] As a further optional solution to the method for preparing a high-elasticity high-temperature alloy sealing ring, the pressure when stretching the wafer is 130 MPa, the pressure when stretching the first workpiece is 120 MPa, and the pressure when stretching the second workpiece is 100 MPa.

[0031] As a further optional solution to the method for preparing a sealing ring made of a high-elasticity high-temperature alloy, the step of hydraulically bulging the annealed blank comprises:

[0032] The blank is placed between a first movable mold and a second movable mold, the first movable mold and the second movable mold are kept stationary, hydraulic oil is injected into the inner side of the blank, the mold clamping pressure is controlled to be 80±2 MPa and maintained for 5 to 10 minutes, and the blank is pre-bulged;

[0033] Feed the first movable mold and the second movable mold toward the middle mold until the first movable mold and the second movable mold are closed with the middle mold, and control the mold clamping pressure to 71±2 MPa;

[0034] The first movable mold and the second movable mold are kept stationary, the mold clamping pressure is controlled to be greater than 100 MPa, and the blank is shaped.

[0035] Another object of the present invention is to provide a sealing ring.

[0036] The present invention provides the following technical solutions:

[0037] A sealing ring is prepared by the above-mentioned method for preparing a sealing ring made of a high-elasticity high-temperature alloy.

[0038] The embodiments of the present invention have the following beneficial effects:

[0039] By replacing the existing age-hardening nickel-based deformable high-temperature alloy with a high-elasticity high-temperature alloy, the resulting sealing ring possesses sufficient elasticity and high-temperature sealing performance. During the preparation process, the wafer is first annealed to eliminate internal stress in the wafer and to control the grain structure of the material. The blank is then annealed to eliminate local stress formed during the wafer's tensile deformation and reduce the density of crystal defects within the material (including dislocation density, twin density, and stacking fault density). This gives the material excellent work-hardening capabilities, facilitating the subsequent hydraulic bulging process, and ultimately, successfully forming the high-elasticity high-temperature alloy into a sealing ring.

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 A flowchart showing the steps of a method for preparing a sealing ring made of a high-elasticity high-temperature alloy provided by an embodiment of the present invention is shown;

[0043] Figure 2 A flow chart showing step S2 of a method for preparing a sealing ring made of a high-elasticity high-temperature alloy provided by an embodiment of the present invention is shown;

[0044] Figure 3 A flow chart showing step S3 of a method for preparing a sealing ring made of a high-elasticity high-temperature alloy provided by an embodiment of the present invention is shown;

[0045] Figure 4 A schematic structural diagram of a third workpiece after processing in step S3-3 in a method for preparing a sealing ring made of a high-elasticity high-temperature alloy provided by an embodiment of the present invention is shown;

[0046] Figure 5 A flow chart showing step S4 of a method for preparing a sealing ring made of a high-elasticity high-temperature alloy provided by an embodiment of the present invention is shown;

[0047] Figure 6 A flow chart showing step S6 of a method for preparing a sealing ring made of a high-elasticity high-temperature alloy provided by an embodiment of the present invention is shown;

[0048] Figure 7 A schematic diagram showing the state before processing in step S6-1 of a method for preparing a sealing ring made of a high-elasticity high-temperature alloy provided by an embodiment of the present invention;

[0049] Figure 8 A schematic diagram showing the state after processing in step S6-1 in a method for preparing a sealing ring made of a high-elasticity high-temperature alloy provided by an embodiment of the present invention;

[0050] Figure 9 A schematic diagram showing the state after processing in step S6-2 in a method for preparing a sealing ring made of a high-elasticity high-temperature alloy provided by an embodiment of the present invention;

[0051] Figure 10 A schematic diagram showing the state after processing in step S6-3 in a method for preparing a sealing ring made of a high-elasticity high-temperature alloy provided by an embodiment of the present invention;

[0052] Figure 11 A flow chart showing step S7 of a method for preparing a sealing ring made of a high-elasticity high-temperature alloy provided by an embodiment of the present invention is shown;

[0053] Figure 12 A structural schematic diagram of a sealing ring provided by an embodiment of the present invention is shown.

[0054] Description of main component symbols:

[0055] 100-third workpiece; 200-blank; 300-first movable mold; 400-second movable mold; 500-middle mold; 600-sealing ring. DETAILED DESCRIPTION

[0056] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0057] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. Conversely, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0058] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the template description herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0061] Example

[0062] See also Figure 1 This embodiment provides a method for preparing a sealing ring made of a high-elasticity high-temperature alloy (hereinafter referred to as the "preparation method"). This preparation method uses a high-elasticity high-temperature alloy to prepare a sealing ring 600, thereby overcoming the problems of sealing rings 600 made of existing age-hardened nickel-based deformable high-temperature alloys, such as insufficient elasticity and substandard high-temperature sealing performance.

[0063] In this example, the UNSN03360 American Standard ultra-high elasticity high-temperature alloy is used as an example. This alloy corresponds to the domestic material grade 97NiBe and is both a high-elasticity alloy and a high-temperature alloy. Furthermore, this alloy offers advantages such as high electrical conductivity, high elasticity, and excellent creep properties. It is widely used in sealing structures such as gas turbines, combustion chambers, casings, gas pipelines, and compressors.

[0064] Literature data show that the domestic use of solution and aging heat treatment methods to control the performance of 97NiBe thick plate materials (thickness greater than 10mm), the solution temperature is required to be above 1000℃, and the resulting grain size is relatively coarse (greater than 200μm).

[0065] However, the thickness of the sealing ring 600 to be manufactured is much less than 10mm, and the grain size of the material used for the sealing ring 600 must be less than 100μm to achieve good sealing performance. After 97NiBe is treated by existing heat treatment methods, it is impossible to manufacture the sealing ring 600 using conventional hydraulic bulging technology.

[0066] Therefore, the above preparation method replaces the existing age-hardened nickel-based deformed high-temperature alloy with a high-elasticity high-temperature alloy, while also solving the problem that the high-elasticity high-temperature alloy cannot be directly used in the hydraulic bulging process to prepare the sealing ring 600.

[0067] The above preparation method comprises the following steps:

[0068] S1, obtaining a wafer made of a high-elasticity high-temperature alloy.

[0069] Specifically, UNSN03360 ultra-high elasticity high temperature alloy sheet was used as raw material, and was cut by a wire cutting machine to obtain a disc with a diameter of 30.0 mm.

[0070] Among them, the thickness of UNSN03360 ultra-high elastic high-temperature alloy sheet is 0.2-0.35mm.

[0071] Optionally, the thickness of the UNSN03360 ultra-high elastic high-temperature alloy sheet is any value among 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, and 0.2-0.35 mm.

[0072] In this embodiment, the thickness of the UNSN03360 ultra-high elasticity high temperature alloy sheet is 0.3 mm. Accordingly, the thickness of the disc and the finally formed sealing ring 600 are both 0.3 mm.

[0073] S2, annealing the wafer.

[0074] See also Figure 2 , the specific steps are as follows:

[0075] S2-1, clean the wafer with anhydrous ethanol and dry it.

[0076] S2-2, placing the wafer in a vacuum furnace for annealing at a temperature of 925±10°C for 10±1 min.

[0077] S2-3, performing water cooling on the wafer.

[0078] Annealing the wafer can eliminate the internal stress of the wafer material, regulate the grain structure of the material, and facilitate the subsequent hydraulic bulging process.

[0079] S3, stretching and cutting the annealed disc to form a ring-shaped blank 200 (see Figure 7 ).

[0080] See also Figure 3 , the specific steps are as follows:

[0081] S3-1, stretching the disc to form a cylindrical first workpiece, wherein one end of the first workpiece is closed and the other end is open.

[0082] In this embodiment, a hydraulic press is used to stretch the disc at a pressure of 130 MPa. In addition, the outer diameter of the first workpiece after stretching is 16.5 mm.

[0083] S3-2, stretching the first workpiece to form a second workpiece.

[0084] In this embodiment, a hydraulic press is used to stretch the first workpiece at a pressure of 120 MPa. In addition, the outer diameter of the second workpiece after stretching is 13.0 mm.

[0085] S3-3, stretching the second workpiece to form a third workpiece 100.

[0086] See also Figure 4 In this embodiment, a hydraulic press is used to stretch the second workpiece, and the pressure is 100 MPa. In addition, the outer diameter of the third workpiece 100 after stretching is 9.8 mm.

[0087] S3-4, cutting the third workpiece 100 at both ends along the axial direction to form an annular blank 200.

[0088] In this embodiment, the blank 200 has a length of 11.0 mm and an outer diameter of 9.8 mm.

[0089] S4, annealing the blank 200.

[0090] See also Figure 5 , the specific steps are as follows:

[0091] S4-1, clean the blank 200 with anhydrous ethanol and dry it.

[0092] S4-2, placing the blank 200 in a vacuum furnace for annealing, the annealing temperature is 940±10°C, and the holding time is 20±1min.

[0093] S4-3, performing water cooling treatment on the blank 200.

[0094] Annealing the blank 200 can eliminate the local stress formed in the blank 200 during the tensile deformation process, and at the same time reduce the crystal defect density (such as dislocation density, twin density and stacking fault density, etc.) inside the material, thereby facilitating the subsequent hydraulic bulging process.

[0095] S5, removing the oxide layer on the surface of the blank 200.

[0096] Specifically, 200-mesh corundum sand is used to remove the oxide layer on the surface of the blank 200 by wet sand blowing at a pressure of 1.5 to 2.5 MPa.

[0097] S6, hydraulically bulging the annealed blank 200 and removing the excess to form a sealing ring 600.

[0098] See also Figure 6 , the specific steps are as follows:

[0099] S6-1, place the blank 200 between the first movable mold 300 and the second movable mold 400, keep the first movable mold 300 and the second movable mold 400 stationary, inject hydraulic oil into the inside of the blank 200, control the mold clamping pressure to 80±2Mpa and maintain it for 5 to 10 minutes, and pre-expand the blank 200.

[0100] Please also refer to Figure 7 and Figure 8 After pre-bulging, the blank 200 undergoes a certain amount of plastic bulging deformation in the radial direction.

[0101] S6-2, see Figure 9 , the first movable mold 300 and the second movable mold 400 are fed toward the middle mold 500 until the first movable mold 300 and the second movable mold 400 are closed with the middle mold 500, and the mold closing pressure is controlled to 71±2Mpa.

[0102] The first and second movable molds 300 and 400 are simultaneously fed along the design trajectory of the sealing ring 600 mold surface, ultimately closing with the middle mold 500. During this process, the blank 200 is filled into the mold cavity under the action of high-pressure fluid and abuts against the mold cavity until the first and second movable molds 300 and 400 are completely closed.

[0103] S6-3, see Figure 10 , keep the first movable mold 300 and the second movable mold 400 stationary, control the mold clamping pressure to be greater than 100 MPa, increase the hydraulic pressure to make the blank 200 completely close to the mold cavity, and perform high-pressure shaping on the blank 200.

[0104] S6-4, after the blank 200 is positioned and clamped, the excess margin at both ends of the blank 200 is evenly removed to form a sealing ring 600 (see Figure 12 ). Soak and clean the sealing ring 600 with acetone to remove the residual processing medium and burrs.

[0105] Among them, the control test was carried out after adjusting the pressure in each stage of hydraulic bulging, and the results are as follows:

[0106]

[0107] In addition, a control experiment was conducted by replacing the hydraulic oil with distilled water while keeping the mold clamping pressure constant at each stage. During the high-pressure shaping stage, wrinkles appeared on the W-section of the seal ring 600.

[0108] S7, performing aging treatment on the sealing ring 600.

[0109] See also Figure 11 , the specific steps are as follows:

[0110] S7-1, place the sealing ring 600 in a vacuum furnace at a temperature of 495±5℃ and keep it warm for 120±2min.

[0111] S7-2, performing air cooling treatment on the sealing ring 600.

[0112] In this embodiment, argon gas is passed into the vacuum furnace to cool the sealing ring 600 .

[0113] Aging the seal ring 600 disperses and precipitates Be3Ni intermetallic compounds within the material, producing a strong precipitation hardening effect. These strengthening phases are relatively stable under high temperatures and complex stress conditions, ensuring that the seal ring 600's various performance properties (including elasticity, tensile strength, fatigue resistance, and creep resistance) meet requirements during service.

[0114] The second annealing process parameters (including temperature, time and cooling method) and aging process parameters (including temperature, time and cooling method) were adjusted, while keeping other processing parameters unchanged. A control test was conducted, and the results are as follows:

[0115]

[0116] Combined with the performance indicators specified in the sealing ring 600 design drawing - the microhardness value is not less than 468HV, the high temperature elasticity test rebound is not less than 0.43mm, and the sealing performance requirement is that no leakage is allowed under a pressure of 84Mpa, the optimal heat treatment parameters can be determined as:

[0117] In the second annealing, the temperature in the vacuum furnace is raised to 940±10℃, kept at this temperature for 20±1min, and then cooled with water. In the aging treatment, the temperature in the vacuum furnace is raised to 495±5℃, kept at this temperature for 120±2min, and then cooled with air.

[0118] S8, removing the oxide layer on the surface of the sealing ring 600.

[0119] Specifically, first, 200-mesh corundum sand is used to wet-blast sand at a pressure of 1.5-2.5 MPa to remove the oxide layer on the surface of the sealing ring 600. Then, the sealing ring 600 is cleaned with acetone and finally dried in a vacuum drying oven.

[0120] In summary, compared to existing hydroforming processes, the above-described production method replaces the existing age-hardening nickel-based wrought high-temperature alloy with 97NiBe, resulting in a seal ring 600 with sufficient elasticity and high-temperature sealing performance. Furthermore, the above-described production method encompasses hydroforming, annealing, and aging heat treatment processes, focusing on manipulating the grain orientation, grain structure, element distribution, and strengthening phase distribution of the seal ring 600 material to produce a metal seal ring 600 that meets service performance standards.

[0121] Secondly, the existing 97NiBe heat treatment process involves a single high-temperature solid solution treatment, which is suitable for thick 97NiBe plates greater than 10mm in thickness and is therefore unsuitable for preparing the ultra-thin 97NiBe sheets used in sealing ring 600. The aforementioned preparation method utilizes a single annealing process before sheet stretching, lowering the heat treatment temperature. This ensures the full formation of a supersaturated solid solution within the material used in sealing ring 600 while also reducing the grain size, ensuring excellent strength and toughness, and facilitating the forming process of sealing ring 600.

[0122] Furthermore, the aforementioned preparation method incorporates an annealing heat treatment process for the blank 200 prior to hydroforming. This, on the one hand, helps remove the internal stresses generated during the forming process of the sealing ring 600, thereby avoiding localized stress concentration. On the other hand, it reduces the density of crystal defects (such as dislocations, twins, and stacking faults) within the material used for the sealing ring 600, imparting excellent work-hardening capabilities to the material, facilitating the subsequent hydroforming process and ensuring more uniform deformation and accurate dimensional accuracy for the sealing ring 600.

[0123] Finally, the aforementioned preparation method applies an aging heat treatment to the seal ring 600 after hydroforming, resulting in the uniform precipitation of Be3Ni intermetallic compounds within the seal ring 600 material, producing a strong precipitation hardening effect. Unlike the γ′ phase, δ phase, and a small amount of carbides in aged GH4169 and GH738 alloys, which tend to grow and become unstable under high-temperature operation, the Be3Ni intermetallic compounds are in a completely coherent relationship with the matrix. The Be3Ni remains highly stable within the temperature range of 25°C to 700°C, ensuring that the metal seal ring 600 exhibits excellent elasticity, sealing performance, fatigue resistance, and creep resistance under high-temperature and complex stress conditions.

[0124] See also Figure 12 This embodiment also provides a sealing ring 600, which is prepared using the above-mentioned preparation method.

[0125] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not limiting, and thus other examples of the exemplary embodiments may have different values.

[0126] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0127] The above-described embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that variations and modifications are possible without departing from the scope of the present invention, and such variations and modifications are fully within the scope of protection of the present invention.

Claims

1. A method for preparing a sealing ring made of a high-elasticity high-temperature alloy, characterized in that: include: Obtaining a disc made of a high-elasticity high-temperature alloy; annealing the wafer; stretching and cutting the annealed disc to form a ring-shaped blank; annealing the blank; The annealed blank is subjected to hydraulic bulging and excess is removed to form a sealing ring; Performing aging treatment on the sealing ring; Annealing the blank comprises: The blank is placed in a vacuum furnace for annealing at a temperature of 940±10°C and a holding time of 20±1 min; performing water cooling treatment on the blank; The sealing ring is subjected to aging treatment, comprising: Place the sealing ring in a vacuum furnace at a temperature of 495±5°C for 120±2 min; The sealing ring is subjected to air cooling treatment.

2. The method for preparing a high-elasticity high-temperature alloy sealing ring according to claim 1, characterized in that: Annealing the wafer, comprising: The wafer is placed in a vacuum furnace for annealing at a temperature of 925±10°C for 10±1 min. The wafer is subjected to a water cooling treatment.

3. The method for preparing a high-elasticity high-temperature alloy sealing ring according to any one of claims 1-2, characterized in that: The thickness of the disc is 0.2-0.35 mm.

4. The method for preparing a high-elasticity high-temperature alloy sealing ring according to claim 3, characterized in that: The annealed disc is stretched and cut to form a ring-shaped blank, comprising: The disc is stretched to form a cylindrical first workpiece, wherein one end of the first workpiece is closed and the other end is open; stretching the first workpiece to form a second workpiece; stretching the second workpiece to form a third workpiece; The third workpiece is cut at both ends along the axial direction to form the annular blank.

5. The method for preparing a high-elasticity high-temperature alloy sealing ring according to claim 4, characterized in that: The diameter of the wafer is 30.0 mm, the outer diameter of the first processed part is 16.5 mm, the outer diameter of the second processed part is 13.0 mm, and the outer diameter of the third processed part is 9.8 mm.

6. The method for preparing a high-elasticity high-temperature alloy sealing ring according to claim 4, characterized in that: The pressure when the wafer is stretched is 130 MPa, the pressure when the first workpiece is stretched is 120 MPa, and the pressure when the second workpiece is stretched is 100 MPa.

7. The method for preparing a high-elasticity high-temperature alloy sealing ring according to claim 1, characterized in that: The annealed blank is subjected to hydraulic bulging, comprising: The blank is placed between a first movable mold and a second movable mold, the first movable mold and the second movable mold are kept stationary, hydraulic oil is injected into the inner side of the blank, the mold clamping pressure is controlled to 80±2 MPa and maintained for 5 to 10 minutes, and the blank is pre-bulged; Feed the first movable mold and the second movable mold toward the middle mold until the first movable mold and the second movable mold are closed with the middle mold, and control the mold clamping pressure to 71±2 MPa; The first movable mold and the second movable mold are kept stationary, the mold clamping pressure is controlled to be greater than 100 MPa, and the blank is shaped.

8. A sealing ring, characterized in that: The sealing ring is prepared by the method for preparing a sealing ring made of a high-elasticity high-temperature alloy according to any one of claims 1 to 7.

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