Cartridge receiver and manufacturing method thereof

Abstract

The invention provides a cartridge receiver and a manufacturing process method thereof. According to the cartridge receiver manufacturing process method, the position of a welding seam is designed, a welding method is selected, the sequence of the welding seam is arranged, welding deformation is controlled, and multiple times of heat treatment are adopted to thoroughly eliminate the residual stress after welding so as to achieve the use performance, and a positioning tool is designed by adopting materials with similar linear expansion coefficients, the welding deformation is controlled, and meanwhile, the positioning tool is driven to carry out stress relief treatment, so that the welding deformation is more accurately controlled within a required range. The welding technology is adopted, and the integral casting bottleneck of the large-size cartridge receiver with the outer diameter larger than 1700 mm is solved; small castings, forgings and sheet metal parts are installed and welded after being formed, so that the size precision requirement and the weight reduction requirement of large-size cartridge receiver parts can be met more easily; and in addition, the manufacturing requirements of higher-power and higher-thrust gas turbines and aero-engine casing parts are met, so that the technical progress is greatly promoted.

Description

Casing and its manufacturing method Technical Field

[0001] This invention relates to the field of aero-engines, and more particularly to a casing and its manufacturing method. More specifically, this invention relates to a precipitation-strengthened nickel-based alloy casing with an outer diameter exceeding 1700 mm and its manufacturing process. Background Technology

[0002] The engine is the "heart" of an aircraft, the driving force behind its rapid development, and a decisive factor in its performance, reliability, and cost. The development of aero-engine technology plays an extremely important role in national defense and the national economy, and every breakthrough and advancement marks another leap forward for mankind in the field of aviation.

[0003] The casing is one of the most important components of an aero-engine. It serves as the base of the entire engine and is the main load-bearing component. Its external structure is complex, and the shape of the casing varies depending on the engine and different parts of the engine. The function of the casing components determines the shape of the casing, but their basic characteristics are that they are components composed of a cylindrical or conical shell and support plates. Due to the high difficulty and long cycle of casing component design, the design of the casing accounts for a considerable proportion of the overall engine design. Improving the design efficiency of the casing is of great significance to the design of the entire compressor engine.

[0004] In recent years, with the continuous increase in the power of gas turbines and the thrust of aero engines, and in order to meet the requirements of lightweighting and weight reduction, the size and structural complexity of their casings have increased accordingly compared with the earlier development. The maximum outer diameter has reached more than 1700mm, and the minimum wall thickness is less than 2mm. The materials used are generally precipitation-strengthened nickel-based alloys, which are required to have good high-temperature mechanical properties and structural stability.

[0005] However, if materials such as precipitation-strengthened nickel-based alloys are manufactured using integral casting processes, the following drawbacks exist: First, the existing equipment capacity is insufficient, resulting in extremely limited equipment resources to meet the size requirements; second, the casting process is immature, leading to serious metallurgical defects and dimensional inaccuracies.

[0006] Currently, the main solutions in this technical field are as follows:

[0007] For example, existing literature CN103551770A discloses a method and process equipment for controlling the deformation of a nickel-based age-hardened high-temperature alloy casing welding assembly. It utilizes the rigid constraint of materials with similar coefficients of linear expansion to control the amount of welding deformation. A fixture structure is adopted that can meet the requirements of rigid support during welding and control deformation to eliminate residual welding stress. After the inner ring and eight T-shaped support plates form an octagonal structure, a stress-relieving heat treatment process at 550℃ is added to reduce the residual stress at the root of the inner ring and support plates before electron beam welding. After all welding processes are completed, a vacuum solution treatment at 970℃ followed by double aging treatments at 720℃ and 620℃ is added to completely eliminate post-weld residual internal stress and achieve the desired performance.

[0008] For example, existing document CN110340495A discloses an integrated tooling fixture and its assembly method for welding heat treatment of thin-walled casings, including a base, a positioning block, and a pressure cap. The base has multiple lower end face clamping mechanisms evenly distributed circumferentially for clamping the lower end face of the thin-walled casing. The base also has a positioning stop that fits with the lower end face of the thin-walled casing with a clearance fit. The pressure cap is located on the outer periphery of the upper end face of the thin-walled casing and within the upper end stop of the positioning block. An upper end face clamping mechanism is provided between the pressure cap and the upper end face of the thin-walled casing. One end of the positioning block is mounted on the base via a fixing mechanism, and the other end of the positioning block is connected to the upper end face of the thin-walled casing. This effectively controls the radial deformation of the parts during welding and heat treatment, ensuring that the roundness and flow channel runout after welding and heat treatment meet the design requirements.

[0009] For example, the existing document CN110732795A discloses a welding method for an aero-engine exhaust casing. By rationally arranging the welding sequence, welding method, assembly sequence, and reference selection of the components that make up the inner and outer rings, such as the outer ring front mounting edge, support plate, cylinder front section, mounting seat, inner ring mounting edge, cylinder rear section, central cone inclined section, outer ring rear mounting edge, exhaust pipe, and reinforcing ring, the method overcomes the problems of high machining accuracy requirements, numerous welds, and compact space of the exhaust casing, improves the welding quality, and meets the requirements of subsequent machining.

[0010] Furthermore, existing literature CN104084675 discloses a welding process for high-temperature nickel-based alloys, which involves solution treatment of C-HRA-1 age-hardening high-temperature nickel-based alloys supplied in a solution-treated and aged state, or directly requiring steel mills to supply them in a solution-treated state; preparing bevels; using Φ2.4 C-HRA-1 high-temperature nickel-based alloy special strip welding wire when using manual argon arc welding, and using Φ1.0 C-HRA-1 high-temperature nickel-based alloy special disc welding wire when using hot wire mechanical argon arc welding; and performing post-weld heat treatment of C-HRA-1 age-hardening high-temperature nickel-based alloys at 800℃ for at least 4 hours after welding.

[0011] As stated above, it is clear that none of the existing documents can effectively solve the following technical problems currently existing in this field:

[0012] 1. Casting problems of large-size precipitation-strengthened nickel-based alloys;

[0013] 2. The casing has a complex structure and a large number of welds. It is necessary to develop a reasonable welding process, including the selection of weld locations, welding methods, and weld quality control.

[0014] 3. High fatigue strength requirements are placed on welded joints during service, and residual stress control in welded joints is crucial; and

[0015] 4. High requirements for part dimensions and control of welding deformation.

[0016] Therefore, as can be seen from the above, how to design a large-size casing that overcomes the aforementioned technical defects and its manufacturing process has become an urgent technical problem to be solved. Summary of the Invention

[0017] The present invention is made to solve the above-mentioned technical problems. The purpose of the present invention is to provide a casing and its manufacturing process, wherein the process employs multiple small castings to be cast separately to ensure the quality of the castings, while for structures with high dimensional requirements, multiple small forgings or sheet metal parts are formed, and finally welding technology is used to realize the manufacturing of large-size casing parts.

[0018] To achieve the aforementioned objective, according to one aspect of the present invention, a method for manufacturing a casing is provided, for manufacturing a casing having an outer ring and an inner ring, the casing being made of a precipitation-strengthened nickel-based alloy, wherein the outer ring and the inner ring are coaxially arranged and connected by an even number of support plates. The method includes the following steps:

[0019] Step a): Divide the casing to be manufactured into an inner ring, a T-shaped support plate, an outer ring wall connecting plate, and an outer ring mounting edge; wherein, the T-shaped support plate includes a support plate segment and an outer ring segment, and the outer ring wall connecting plate is disposed between the outer ring segments of a portion of the T-shaped support plate, and together with the outer ring segments, forms the wall of the outer ring; the inner ring, the T-shaped support plate, the outer ring wall connecting plate, and the outer ring mounting edge are manufactured and formed respectively;

[0020] Step b): Provide positioning fixtures to assemble and position the inner ring and the T-shaped support plate, and weld the T-shaped support plate and the inner ring together; wherein each T-shaped support plate is welded to the inner ring by three passes of at least partially overlapping argon arc welding, wherein the first pass weld and the second pass weld respectively surround the support plate segment of the T-shaped support plate and have opposite welding directions, and the third pass weld is set on both sides of the tail edge of the support plate segment and is opposite to the welding direction of the second pass weld; during the welding process, the T-shaped support plates symmetrical about the housing axis are divided into a support plate pair, and after welding one support plate pair, the adjacent other support plate pair is welded; to obtain a semi-finished welded housing component;

[0021] Step c): The semi-finished welded part of the casing and the positioning fixture are subjected to solution treatment together;

[0022] Step d): Assemble the outer ring wall connecting plate and use electron beam welding to weld the outer ring segment of the wall body that makes up the outer ring to the outer ring wall connecting plate as a whole, wherein the welding sequence is the same as the welding sequence of the support plate pair in step b); Assemble the outer ring mounting edge and use electron beam welding to fix it to obtain the casing welded part;

[0023] Step e): Perform aging treatment on the welded parts of the casing together with the positioning fixture; to obtain the finished casing.

[0024] Furthermore, in some embodiments, in step a), the inner ring and the T-shaped support plate are manufactured using a casting process, the outer ring wall connecting plate is manufactured using a stamping process, and the mounting edge is manufactured using a forging process.

[0025] Furthermore, in some embodiments, in step b), the first pass weld and the second pass weld each include seven weld segments, which are sequentially connected around the support plate segment in the same welding direction, and each weld segment is welded separately.

[0026] Furthermore, in some embodiments, the surface of the support plate extending from the leading edge to the trailing edge forms a first side surface and a second side surface. From the leading edge to the trailing edge, a fourth welding segment, a first welding segment, and a fifth welding segment are sequentially arranged on one side of the first side surface, and a sixth welding segment, a second welding segment, and a third welding segment are sequentially arranged on one side of the second side surface. A seventh welding segment connects the sixth welding segment and the fourth welding segment. During welding, welding is performed in the order of the first welding segment, the second welding segment, the third welding segment, the fourth welding segment, the fifth welding segment, the sixth welding segment, and the seventh welding segment.

[0027] Furthermore, in some embodiments, in step b), the tilting deformation and torsional deformation of the T-shaped support plate after welding do not exceed 1 mm.

[0028] Furthermore, in some embodiments, the misalignment between the T-shaped support plate and the inner ring assembled in step b) does not exceed 0.5 mm.

[0029] Furthermore, in some embodiments, the difference between the linear expansion coefficient of the material of the positioning tooling and the linear expansion coefficient of the precipitation-strengthened nickel-based alloy does not exceed a given threshold.

[0030] Furthermore, in some embodiments, in step c), the solution treatment is heated to 960℃±10℃ at a rate of 8℃ / min-12℃ / min and held at that temperature for 1h±10min, followed by cooling in an argon atmosphere.

[0031] Furthermore, in some embodiments, in step d), the misalignment between the outer ring wall connecting plate, the mounting edge, and the outer ring segment does not exceed 0.2 mm.

[0032] Further, in some embodiments, in step e), the aging treatment involves heating to 720±10℃ at a rate of 8℃ / min-12℃ / min and holding for 8h±0.5h; cooling to 620±10℃ and holding for 8±0.5h; and then cooling in an argon atmosphere.

[0033] Furthermore, in some embodiments, after each weld is completed, it is ground and subjected to fluorescence and X-ray inspection, and defects exceeding the given standard are repaired by welding.

[0034] Furthermore, in some embodiments, lifting lugs are provided on the outer side of the outer ring section of the plurality of T-shaped support plates, and the lifting lugs are used for hoisting in steps c) to e).

[0035] Furthermore, in some embodiments, the casing further includes a tapered portion manufactured by a forging process, and in step d), after the outer ring mounting edge is welded and fixed, the tapered portion is welded and fixed to the inner ring by electron beam welding.

[0036] Furthermore, in some embodiments, before welding, the method further includes a step of determining the radial shrinkage amount of welding by means of a welding test piece, and reserving a shrinkage allowance when manufacturing the product in step a) based on the radial shrinkage amount.

[0037] According to another aspect of the present invention, a housing is provided, which is manufactured using the housing manufacturing method provided in any of the foregoing embodiments.

[0038] Due to the above-mentioned technical solutions, compared with the prior art, the core technology of this invention lies in: controlling welding deformation by rationally designing the weld position, selecting appropriate welding methods, and arranging the weld sequence, while using multiple heat treatments to eliminate residual stress, thereby achieving high lifespan and high reliability manufacturing of precipitation-strengthened nickel-based alloy casing parts.

[0039] In view of the above, compared with the prior art, the present invention can bring the following superior technical effects:

[0040] 1. Welding technology was adopted to solve the bottleneck of integral casting of large-size casings with an outer diameter exceeding 1700mm;

[0041] 2. Using small castings, forgings, and sheet metal parts for forming and welding makes it easier to meet the dimensional accuracy requirements and weight reduction requirements of large-size casing parts;

[0042] 3. To meet the manufacturing needs of higher power and greater thrust gas turbines and aero-engine casing parts, and to drive technological progress.

[0043] Based on common knowledge in the field, the above-mentioned preferred embodiments can be combined arbitrarily to obtain various preferred examples of the present invention. Attached Figure Description

[0044] To better understand the above and other objects, features, advantages, and functions of the present invention, reference can be made to the preferred embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate preferred embodiments of the invention and do not limit the scope of the invention in any way; the parts in the drawings are not drawn to scale. In the drawings:

[0045] Figure 1 is a schematic diagram of the exploded cross-section of the casing in one embodiment;

[0046] Figure 2 is a schematic diagram of the exploded cross-section of the casing in one embodiment;

[0047] Figure 3 is a schematic diagram of the combination of the T-shaped support plate and the positioning fixture in one embodiment;

[0048] Figure 4 is a schematic diagram of the welding sequence of the T-shaped support plate in one embodiment;

[0049] Figure 5 is a schematic diagram of the welded sections of the T-shaped support plate in one embodiment;

[0050] Figure 6 is a schematic diagram of the installation edge positioning fixture assembly in one embodiment.

[0051] The reference numerals in the figures are used in the technical solutions and embodiments:

[0052] 11-Inner Ring;

[0053] 12-Lifting lug T-shaped support plate;

[0054] 13-T type support plate;

[0055] 14-Outer ring wall connecting plate;

[0056] 15-Cone-shaped part;

[0057] 16-Outer ring mounting edge;

[0058] 17-Support plate section;

[0059] 18 - Outer Ring Road Section;

[0060] 2, 21, 22, 23, 24, 25, 26, 27, 212, 222, 232, 242, 252, 262, 272 - T-type support plate welds;

[0061] 31-Positioning fixture;

[0062] 32 - Install the edge positioning fixture;

[0063] 411, 412, 413, 414, 415, 416, 417, 421, 422, 423, 424, 425, 426, 427, 431, 432 - Weld bead of the support plate segment;

[0064] 51-Weld;

[0065] 52 - Weld. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be described in more detail below with reference to the accompanying drawings.

[0067] First, it should be noted that, in the detailed description of these embodiments, for the sake of brevity, this specification cannot provide a detailed description of all features of the actual embodiments. It should be understood that, in the actual implementation of any embodiment, just as in any engineering or design project, various specific decisions are often made to achieve the developer's specific goals and to meet system-related or business-related constraints, and these decisions can change from one embodiment to another. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this invention, some design, manufacturing, or production modifications based on the technical content disclosed herein are merely conventional technical means and should not be construed as insufficient content of this disclosure.

[0068] Furthermore, it should be noted that, unless otherwise defined, the technical or scientific terms used in the claims and description should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The words "an" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one. The words "comprising" or "including" mean that the elements or objects preceding "comprising" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The words "connected" or "linked" are not limited to physical or mechanical connections, nor are they limited to direct or indirect connections.

[0069] The preferred embodiment of the casing and its manufacturing process of the present invention will now be described in detail with reference to Figures 1-6, so that the advantages and features of the present invention can be easily understood by those skilled in the art, thereby providing a clearer definition of the scope of the present invention.

[0070] One embodiment of the present invention provides a method for manufacturing a casing. The casing is made of a precipitation-strengthened nickel-based alloy and includes an inner ring and an outer ring, which are connected by an even number of support plates. The method for manufacturing the casing includes the following steps:

[0071] Step a): Divide the casing as shown in Figures 1 and 2. Specifically, it is divided into: an inner ring 11; multiple T-shaped support plates, including multiple T-shaped support plates 12 with lifting lugs and T-shaped support plates 13 without lifting lugs, each T-shaped support plate including a support plate segment 17 extending approximately radially along the casing and an outer ring segment 18 extending circumferentially along the casing; an outer ring wall connecting plate 14, which is disposed between some of the T-shaped support plates and together with the outer ring segment 18 of the T-shaped support plates forms the wall of the outer ring; a tapered portion 15, which is installed on the inner side of the inner ring 11; and outer ring mounting edges 16 disposed at both ends of the outer ring axially. These components are manufactured separately. The inner ring 11, the T-shaped support plates 12 with lifting lugs, and the T-shaped support plates 13 are manufactured using a casting process, the outer ring connecting plate 14 is formed using a stamping process, and the tapered portion 15 and the outer ring mounting edges 16 are manufactured using a forging process to ensure their assembly dimensions. All components are heat-treated to a solution state.

[0072] Step b): As shown in Figure 3, a positioning fixture 31 is provided to assemble and position the inner ring 11 and the T-shaped support plates. During assembly, ensure that the misalignment is no greater than 0.5mm, and then weld the inner ring 11 to each T-shaped support plate together. The positioning fixture 31 needs to be made of a material with a coefficient of linear expansion similar to that of the precipitation-strengthened nickel-based alloy used to manufacture the casing. A reasonable threshold for the difference in coefficients of linear expansion is determined experimentally based on the casing dimensions. After welding, a semi-finished welded casing part is obtained.

[0073] In the preferred embodiment, the T-shaped support plate is welded using manual argon arc welding. During the welding process, the positioning fixture 31 can adjust the weld position to a flat welding position to avoid the reduction in weld quality caused by vertical or overhead welding. Before welding the inner ring 11 to the T-shaped support plate, the welding deformation is obtained through simulation and experimentation. The welding deformation includes shrinkage deformation, tilting deformation, and torsional deformation. By reasonably arranging the welding sequence and welding method, the influence of welding deformation can be effectively reduced.

[0074] Specifically, as shown in Figure 4, the T-shaped support plates symmetrical about the housing axis are divided into multiple support plate pairs. Each time a support plate pair is welded, the next support plate pair is welded in sequence. The inner ring 11 is welded to each T-shaped support plate in the order of welds 21, 212, 22, 222, 23, 232, 24, 242, 25, 252, 26, 262, 27, 272.

[0075] Further, as shown in Figure 5, the welding of each support plate weld is carried out in the following manner: the weld structure between the support plate segment 17 of the T-shaped support plate and the inner ring 11 is completed by three passes of welding from bottom to top (i.e., from the radial inner side of the casing to the outer side). The first pass of the weld includes seven connected weld segments 411, 412, 413, 414, 415, 416, and 417. The second pass of the weld includes seven connected weld segments 421, 422, 423, 424, 425, 426, and 427. The welding direction of the weld segments in the first and second passes is the same, while the welding direction of the first pass of the weld is opposite to that of the second pass and they surround the support plate segment 17 respectively. The third pass of the weld includes weld segments 431 and 432 located on both sides of the tail edge of the support plate segment 17, and their direction is opposite to that of the second pass of the weld.

[0076] Welding deformation is further reduced by welding different segments in a specific order. Taking the first pass as an example, the side surface of the support plate segment 17 extending from the leading edge to the trailing edge forms a first side and a second side. From the leading edge to the trailing edge, the first side has welding segments 414, 411, and 416 arranged sequentially, and the second side has welding segments 415, 412, and 413 arranged sequentially. Welding segment 417 bypasses the leading edge and connects welding segments 416 and 414. During welding, welding is completed in the order of 411, 412, 413, 414, 415, 416, and 417. The distribution of welding segments in the second pass is the same as in the first pass, but the order of welding segments on the first and second sides is reversed. That is, welding segments 424, 421, and 426 are arranged on the second side, while welding segments 425, 422, and 423 are arranged on the first side. After welding the first and second passes of each segment in sequence, weld the third passes of segments 431 and 432 in sequence.

[0077] By controlling the welding sequence and direction, the tilting and torsional deformation of the T-shaped support plate can be controlled within 1mm.

[0078] In a preferred embodiment, the radial shrinkage of the T-shaped support plate is measured to be 0.8 mm before welding by welding a T-shaped support plate test piece, and a shrinkage allowance of 0.8 mm is reserved when machining the side bevel of the T-shaped support plate.

[0079] In a further preferred embodiment, the welding heat input is controlled at a low level during the welding process to reduce welding deformation, and the specific parameters are shown in Table 1.

[0080]

[0081] Table 1 Welding parameters for T-shaped support plates

[0082] Step c): The semi-finished welded casing parts and positioning fixture 31 are heat-treated together in a furnace to eliminate residual stress generated during welding. Specifically, a high-temperature solution treatment regime is adopted: heating to 960±10℃ at a rate of 8℃ / min-12℃ / min, holding for 1 hour, and then cooling with argon gas. During the heat treatment, positioning fixture 31 is clamped to constrain the semi-finished welded casing parts and prevent deformation during the heat treatment process. After exiting the furnace, the positioning fixture 31 is removed, and the deformation of the T-shaped support plate is measured.

[0083] Step d): Combining with step 6, assemble the outer ring wall connecting plate 14, the tapered part 15, and the outer ring mounting edge 16 with the semi-finished welded parts of the casing using the mounting edge positioning fixture 32, ensuring that the misalignment is no greater than 0.2mm. First, use electron beam welding to weld the outer ring wall connecting plate 14 to the outer ring segments 18 of each T-shaped support plate. Adjacent outer ring segments 18 are also welded together using electron beam welding, making the outer ring wall a whole. The specific welding sequence is consistent with the welding sequence of the T-shaped support plate segments shown in Figure 4 in step b). Subsequently, use electron beam welding to weld the weld 51 of the outer ring mounting edge 16, and finally weld the connecting weld 52 of the tapered part 15. By controlling the welding sequence, the deformation caused by welding can be minimized. Specifically, the welding parameters are shown in Table 2.

[0084]

[0085] Table 2 Electron Beam Welding Parameters

[0086] Step e): The welded casing and tooling are placed together in the furnace for aging treatment. During the heat treatment, the tooling is kept clamped to constrain the workpiece and prevent deformation. The heat treatment process is as follows: heating to 720±10℃ at a rate of 8℃ / min-12℃ / min and holding for 8 hours; cooling to 620±10℃ and holding for 8 hours, followed by argon gas cooling. The finished casing is obtained.

[0087] In a preferred embodiment, after each weld is completed, it is ground to remove visually visible defects, followed by fluorescence and X-ray inspection to ensure the surface and internal quality of the weld. If defects exceeding the standard are detected, repair welding is required using the same argon arc welding or electron beam welding process as the original weld. After repair welding, quality inspection is performed again to ensure that the defects have been effectively addressed.

[0088] In another aspect of the present invention, a casing is provided, which is manufactured using the casing manufacturing method provided in any of the foregoing embodiments.

[0089] Compared to existing technologies, this invention controls welding deformation by rationally designing weld positions, selecting appropriate welding methods, and arranging weld sequences. Simultaneously, it employs multiple heat treatments to eliminate residual stress, achieving high lifespan and high reliability manufacturing of precipitation-strengthened nickel-based alloy casing parts. Furthermore, this invention utilizes welding technology, overcoming the bottleneck of integral casting for large-size casings with outer diameters exceeding 1700mm. The use of small castings, forgings, and sheet metal parts for forming and then welding makes it easier to meet the dimensional accuracy and weight reduction requirements of large-size casing parts. It also satisfies the manufacturing needs of casing parts for higher-power, higher-thrust gas turbines and aero-engines, thus significantly promoting technological progress.

[0090] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that, after reading the above teachings, those skilled in the art will readily conceive of other advantages and modifications. Therefore, in its broader aspects, the present invention is not limited to the specific details and representative embodiments shown and described herein. Consequently, those skilled in the art can reasonably combine or modify the elements of the above embodiments to make various modifications without departing from the spirit or scope of the overall inventive concept as defined by the appended claims and their equivalents.

Claims

1. A method for manufacturing a casing, characterized in that, For manufacturing a casing with an outer ring and an inner ring, the casing being made of a precipitation-strengthened nickel-based alloy, wherein the outer ring and the inner ring are coaxially arranged and connected by an even number of support plates; the process includes the following steps: Step a): Dividing the casing to be manufactured into an inner ring, T-shaped support plates, an outer ring wall connecting plate, and an outer ring mounting edge; wherein, the T-shaped support plate includes a support plate segment and an outer ring segment, and the outer ring wall connecting plate is disposed between the outer ring segments of a portion of the T-shaped support plate, and together with the outer ring segments, forms the wall of the outer ring; the inner ring, the T-shaped support plate, the outer ring wall connecting plate, and the outer ring mounting edge are respectively manufactured and shaped; Step b): Providing positioning fixtures to assemble and position the inner ring and the T-shaped support plate, and welding the T-shaped support plate to the inner ring together; wherein each T-shaped support plate is welded to the inner ring by three passes of at least partially overlapping argon arc welding, wherein the first pass weld and the second pass weld respectively surround the T-shaped support plate. The support plate segments of the T-shaped support plate have opposite welding directions. The third weld is set on both sides of the tail edge of the support plate segment and is opposite to the welding direction of the second weld. During the welding process, the T-shaped support plates symmetrical about the housing axis are divided into a support plate pair. After welding one support plate pair, the adjacent support plate pair is welded. The semi-finished housing welded part is obtained. Step c): The semi-finished housing welded part and the positioning fixture are subjected to solution treatment together. Step d): The outer ring wall connecting plate is assembled, and the outer ring segment that makes up the outer ring wall is welded to the outer ring wall connecting plate as a whole using electron beam welding. The welding sequence is the same as the welding sequence of the support plate pair in step b). The outer ring mounting edge is assembled and fixed by electron beam welding to obtain the housing welded part. Step e): The housing welded part and the positioning fixture are subjected to aging treatment together. The finished housing is obtained.

2. The casing manufacturing method according to claim 1, characterized in that, In step a), the inner ring and the T-shaped support plate are manufactured by casting, the outer ring wall connecting plate is manufactured by stamping, and the mounting edge is manufactured by forging.

3. The method for manufacturing a casing according to claim 1 or 2, characterized in that, In step b), the first pass weld and the second pass weld each include seven weld segments, which are connected sequentially around the support plate segment in the same welding direction, and each weld segment is welded separately.

4. The casing manufacturing method according to claim 3, characterized in that, The support plate extends from the leading edge to the trailing edge to form a first side and a second side. From the leading edge to the trailing edge, a fourth welding segment, a first welding segment, and a fifth welding segment are sequentially arranged on one side of the first side, and a sixth welding segment, a second welding segment, and a third welding segment are sequentially arranged on one side of the second side. A seventh welding segment connects the sixth welding segment and the fourth welding segment. During welding, welding is performed in the order of the first welding segment, the second welding segment, the third welding segment, the fourth welding segment, the fifth welding segment, the sixth welding segment, and the seventh welding segment.

5. The casing manufacturing method according to claim 4, characterized in that, In step b), the tilting deformation and torsional deformation of the T-shaped support plate after welding shall not exceed 1 mm.

6. The method for manufacturing a casing according to claim 1 or 2, characterized in that, In step b), the misalignment between the T-shaped support plate and the inner ring during assembly shall not exceed 0.5 mm.

7. The method for manufacturing a casing according to claim 1 or 2, characterized in that, The difference between the linear expansion coefficient of the material of the positioning tooling and the linear expansion coefficient of the precipitation-strengthened nickel-based alloy does not exceed a given threshold.

8. The method for manufacturing a casing according to claim 1 or 2, characterized in that, In step c), the solution treatment is heated to 960℃±10℃ at a rate of 8℃ / min-12℃ / min and held at that temperature for 1h±10min, followed by cooling in an argon atmosphere.

9. The method for manufacturing a casing according to claim 1 or 2, characterized in that, In step d), the misalignment between the outer ring wall connecting plate, the mounting edge, and the outer ring segment does not exceed 0.2 mm.

10. The method for manufacturing a casing according to claim 1 or 2, characterized in that, In step e), the aging process involves heating to 720±10℃ at a rate of 8℃ / min-12℃ / min and holding for 8h±0.5h; cooling to 620±10℃ and holding for 8±0.5h; and then cooling in an argon atmosphere.

11. The method for manufacturing a casing according to claim 1 or 2, characterized in that, After each weld is completed, it is ground and subjected to fluorescence and X-ray inspection. Defects exceeding the given standards are repaired by welding.

12. The method for manufacturing a casing according to claim 1 or 2, characterized in that, Lifting lugs are provided on the outer side of the outer ring section of the multiple T-shaped support plates, and the lifting lugs are used for hoisting in steps c) to e).

13. The method for manufacturing a casing according to claim 1 or 2, characterized in that, The casing also includes a tapered portion, which is manufactured by a forging process. In step d), after the outer ring mounting edge is welded and fixed, the tapered portion is welded and fixed to the inner ring by electron beam welding.

14. The method for manufacturing a casing according to claim 1 or 2, characterized in that, Before welding, the process also includes a step of determining the radial shrinkage amount of the weld by means of a welding test piece, and reserving a shrinkage allowance when manufacturing the product in step a) based on the radial shrinkage amount.

15. A casing, characterized in that, The casing is manufactured using the casing manufacturing method as described in any one of claims 1 to 14.

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