Vacuum chamber shell cover processing mold, method for preparing vacuum chamber shell cover, vacuum chamber shell cover

Abstract

This application relates to the field of tokamak device technology, and discloses a mold for processing a vacuum chamber shell cover, a method for preparing a vacuum chamber shell cover, and a vacuum chamber shell cover comprising several first shell segments and at least four second shell segments. The first shell segments are straight segments, and the second shell segments are arc-shaped with equal radii. The central angle of each second shell segment is 90 degrees, and both ends of the second shell segments are connected to different first shell segments. The vacuum chamber shell cover has good sealing and stress resistance performance, and can better meet the service requirements of the vacuum chamber window in a tokamak device.

Description

Technical Field

[0001] This application relates to the field of tokamak device technology, specifically to a vacuum chamber shell cover processing mold, a method for preparing a vacuum chamber shell cover, and a vacuum chamber shell cover. Background Technology

[0002] During tokamak operation, the internal production status needs to be observed through the vacuum chamber window. The flexible vacuum chamber shell cover is one way to seal the vacuum chamber window, requiring long-term operation under conditions such as alternating high and low temperatures and pressure fluctuations. The flexible vacuum chamber shell cover has excellent structural strength and sealing performance, but it has extremely high requirements for processing technology, needing to meet high processing efficiency, forming accuracy, material microstructure and properties, and reduce welding deformation.

[0003] In related technologies, vacuum chamber shell covers can be manufactured using additive manufacturing. This method can achieve the forming of complex structures, but it suffers from problems such as high porosity, lack of fusion, and cracks. Furthermore, high-temperature resistance places even higher demands on material manufacturing, and additive manufacturing cannot guarantee material performance.

[0004] Vacuum chamber shells can also be manufactured by forging. This method allows for excellent combination and control of the chemical composition of the shell material, ensuring that the mechanical properties and functionality of the vacuum chamber shell meet the requirements of high temperature, high pressure, and radiation conditions. However, this method has a complex process flow, high requirements for smelting equipment, and is not suitable for small-batch manufacturing.

[0005] The flexible sealing shell cover for the vacuum chamber window is characterized by its thin sheet and large deformation curvature. Forging requires processes such as smelting steel ingots, electroslag remelting, steel billet forging, and machining, resulting in low welding efficiency. Laser additive manufacturing suffers from defects such as high porosity and incomplete fusion, leading to unsatisfactory material properties. One-piece forming is prone to severe edge curling deformation due to the thin sheet, large curvature, and complex structure. Therefore, existing manufacturing methods suffer from low processing efficiency, large deformation, low precision, and poor microstructure, making it difficult to meet the performance requirements for a sealing vacuum chamber shell cover.

[0006] It should be noted that the above statements are only used to provide background information related to this application and do not necessarily constitute prior art. Summary of the Invention

[0007] In a first aspect, this application proposes a vacuum chamber shell cover processing mold, comprising: a first module and a second module; the first module includes a single-curved concave mold portion and a single-curved convex mold portion, wherein the forming surface of the single-curved concave mold portion is a cylindrical groove surface, and the forming surface of the single-curved convex mold portion is a cylindrical convex ridge surface; the cross-sectional profile of the cylindrical groove surface and the cylindrical convex ridge surface in an adapted state is a concentric circular arc; the second module includes a hyperboloid concave mold portion and a hyperboloid convex mold portion, wherein the forming surface of the hyperboloid concave mold portion is a curved cylindrical groove surface, and the forming surface of the single-curved concave mold portion is a curved cylindrical groove surface, and the forming surface of the single-curved convex mold portion is a single-curved concave mold portion, wherein the forming surface of the single-curved concave mold portion is a single-curved concave mold portion, and the forming surface of the single-curved convex mold portion is a single-curved concave mold portion, wherein the forming surface of the single-curved concave mold portion is a single-curved concave mold portion, and the forming surface of the single-curved concave ... The curved cylindrical groove surface includes a formed concave curved surface. In the plane containing the two side edge lines extending along the axial direction of the formed concave curved surface, the axis of the formed concave curved surface is a single-curvature arc. The forming surface of the hyperboloid punch is a curved cylindrical convex ridge surface. The curved cylindrical convex ridge surface includes a formed convex curved surface. In the plane containing the two side edge lines extending along the axial direction of the formed convex curved surface, the axis of the formed convex curved surface is a single-curvature arc. The cross-sectional profile of the curved cylindrical groove surface and the curved cylindrical convex ridge surface in the adapted state is a concentric circular arc.

[0008] In some embodiments, the cavity height between the molding surface of the single-curved concave die portion and the cylindrical convex ridge surface of the first module is 3.5mm-4.5mm; and / or, the cavity height between the molding surface of the hyperboloid concave die portion and the molding surface of the hyperboloid convex die portion of the second module is 3.5mm-4.5mm.

[0009] In some embodiments, the hyperboloidal concave die portion of the second module is provided with a chamfer on the side facing the center of the axis of the formed concave surface.

[0010] In some embodiments, the minimum thickness of the single-curved die portion of the first module is greater than or equal to 20 mm; and / or, the minimum thickness of the hyperboloid die portion of the second module is greater than or equal to 20 mm.

[0011] In some embodiments, in the first module, the single-curved die portion and the single-curved punch portion are detachably connected; and / or, in the second module, the hyperboloid die portion and the hyperboloid punch portion are detachably connected.

[0012] In some embodiments, a sealing plate is further included, wherein a plurality of positioning holes are provided on the sealing plate; a first fixing part is provided on the single-curved surface concave mold part, wherein an elongated hole is provided on the first fixing part, and the first fixing part is connected to the sealing plate by bolts passing through the elongated hole; a second fixing part is provided on the double-curved surface concave mold part, wherein an elongated hole is provided on the second fixing part, and the second fixing part is connected to the sealing plate by bolts passing through the elongated hole.

[0013] In a second aspect of this application, a method for preparing a vacuum chamber shell cover is proposed, which is prepared using the vacuum chamber shell cover processing mold proposed in this application, comprising: pressing a first blanking plate into shape using a first module to obtain a first shell segment; the first blanking plate includes a straight plate; pressing a second blanking plate into shape using a second module to obtain a second shell segment; the second blanking plate includes a fan-shaped plate.

[0014] In some embodiments, the radius of the molding surface of the single-curved die portion of the first module is 85%-95% of the radius of the first shell segment; and / or, the radius of the molding surface of the hyperboloid die portion of the second module is 105%-115% of the radius of the second shell segment.

[0015] In some embodiments, the first shell segment and the second shell segment are respectively assembled in the first module and the second module, and the first module and the second module are fixed on the sealing plate for welding and positioning; after welding and positioning, the corresponding welds of the first shell segment and the second shell segment are welded to prepare the vacuum chamber shell cover.

[0016] In some embodiments, the method further includes: after the welding process, annealing heat treatment is performed on the vacuum chamber shell cover and the vacuum chamber shell cover processing mold, wherein the annealing heat treatment temperature is 300℃-350℃ and the annealing heat treatment time is 3h-6h.

[0017] In some embodiments, the method further includes: sealing the connection between the vacuum chamber cover and the vacuum chamber cover processing mold using vacuum mud, and performing a heating treatment to conduct a sealing test.

[0018] In a third aspect of this application, a vacuum chamber cover is provided, which is prepared by the method proposed in this application. The vacuum chamber cover includes a plurality of first shell segments and at least four second shell segments. The first shell segments are straight segments, and the second shell segments are arc-shaped with equal radii. The central angle of each of the second shell segments is 90 degrees. The two ends of each of the second shell segments are respectively connected to different first shell segments.

[0019] The beneficial effects of the technical solution proposed in this application include at least the following:

[0020] The vacuum chamber shell cover processing mold proposed in this application can be used to process and install vacuum chamber shell covers. It can also be used as a tooling and combined with sealing plates to further complete multiple necessary production steps such as welding assembly, stress relief treatment, and efficient testing of sealing performance and structural strength.

[0021] The method for preparing a vacuum chamber shell cover proposed in this invention involves a process of bending an arc-shaped plate, assembling the entire structure using tooling, laser welding of the weld seams, and low-temperature annealing to relieve structural stress, thereby completing the welding of a flexible vacuum chamber shell cover for a thin-walled vacuum chamber window. Compared to existing technologies, the method described in this application has advantages such as high processing efficiency, minimal deformation, high precision, and excellent material microstructure and properties. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic cross-sectional view of the assembly of the first module and the first shell section in one embodiment of this application;

[0024] Figure 2 This is a schematic cross-sectional view of the assembly of the second module and the second shell section in one embodiment of this application;

[0025] Figure 3 This is a structural diagram of the sealing plate in one embodiment of this application;

[0026] Figure 4 This is a plan view of a vacuum chamber cover in one embodiment of this application, in which the first shell section and the second shell section are welded together to form a 1 / 4 section.

[0027] Figure 5 This is a plan view of a vacuum chamber cover in one embodiment of this application, in which the first shell section and the second shell section are welded together to form a 1 / 2 structure.

[0028] Figure 6 This is a plan view of a vacuum chamber cover formed by welding the first shell segment and the second shell segment together in one embodiment of this application;

[0029] Figure 7 This is a plan view of a vacuum chamber shell cover used for sealing testing in one embodiment of this application;

[0030] Figure 8 This is a schematic diagram of the vacuum chamber shell cover in one embodiment of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] First shell section 1; Second shell section 2; Hyperboloid concave mold section 3; Single-curved concave mold section 4; Hyperboloid convex mold section 5; Single-curved convex mold section 6; Sealing plate 7; Oblong hole 8; Vacuum mud 9; Positioning hole 10; Vacuum chamber cover 11; Leak detection hole 12. Detailed Implementation

[0033] The embodiments of this application are described in detail below, with examples of these embodiments shown in the accompanying drawings. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of practically identical structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0034] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit this application; unless otherwise stated, the values ​​of the parameters mentioned in this application can be measured using various measurement methods commonly used in the art (e.g., they can be tested according to the methods given in the embodiments of this application).

[0035] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are open-ended expressions, meaning they include what is specified in this application but do not exclude other aspects.

[0036] In the description of this application, all figures disclosed herein, whether or not the words "approximately" or "about" are used, are approximate values. Each figure may vary by less than 10% or by a difference that is considered reasonable by one of the art, such as 1%, 2%, 3%, 4%, or 5%.

[0037] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is expected that ranges of 60-110 and 80-120 are also included. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed in this article; "0-5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0038] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0039] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0040] In the first aspect of this application, a mold for machining a vacuum chamber shell cover is provided, with reference to... Figure 1 and Figure 2 The system includes: a first module and a second module; the first module includes a single-curved concave mold part 4 and a single-curved convex mold part 6, wherein the forming surface of the single-curved concave mold part 4 is a cylindrical groove surface, and the forming surface of the single-curved convex mold part 6 is a cylindrical convex ridge surface; the cross-sectional profile of the cylindrical groove surface and the cylindrical convex ridge surface in the adapted state is a concentric circular arc; the second module includes a hyperboloid concave mold part 3 and a hyperboloid convex mold part 5, wherein the forming surface of the hyperboloid concave mold part 3 is a curved cylindrical groove surface, and the curved cylindrical groove surface includes a forming... The concave surface, within the plane containing the two side edge lines extending along the axial direction of the formed concave surface, has a center line that is a single-curvature arc; the forming surface of the hyperboloid punch 5 is a curved cylindrical convex ridge surface, the curved cylindrical convex ridge surface includes a formed convex surface, within the plane containing the two side edge lines extending along the axial direction of the formed convex surface, has a center line that is a single-curvature arc; the cross-sectional profile of the curved cylindrical groove surface and the curved cylindrical convex ridge surface in the adapted state is a concentric circular arc.

[0041] The vacuum chamber cover processing mold proposed in this application includes a first module for processing and installing a first shell segment 1 of the vacuum chamber cover 11, and a second module for processing and installing a second shell segment 2 of the vacuum chamber cover 11. The material of the vacuum chamber cover 11 includes austenitic stainless steel. Using the vacuum chamber cover processing mold proposed in this application, pre-cut sheet steel can be placed on the forming surface of the first module and / or the second module, and then pressed and formed by a press. The pressed and formed first shell segment 1 and second shell segment 2 are assembled with the vacuum chamber cover processing mold as tooling, and combined with the sealing plate 7, etc., to further complete several necessary production steps such as welding assembly, stress relief treatment, and efficient testing of sealing performance and structural strength. Therefore, the method proposed in this application has the advantages of high processing efficiency, small product deformation, high precision, and excellent material microstructure and properties.

[0042] In some embodiments, the cavity height between the molding surface of the single-curved concave mold portion 4 of the first module and the cylindrical convex ridge surface is 3.5mm-4.5mm; and / or, the cavity height between the molding surface of the hyperboloid concave mold portion 3 of the second module and the molding surface of the hyperboloid convex mold portion 5 is 3.5mm-4.5mm. The vacuum chamber cover 11 is required to resist large shear deformation (greater than 7mm) during service. Therefore, a thickness of 3mm-4mm for the prepared vacuum chamber cover 11 is beneficial to meeting the overall device operation requirements during service. Considering the thinning during the molding process, the cavity height between the molding surface of the single-curved concave mold portion 4 of the first module and the cylindrical convex ridge surface, and the cavity height between the molding surface of the hyperboloid concave mold portion 3 of the second module and the molding surface of the hyperboloid convex mold portion 5, are within the aforementioned range, which is beneficial for preparing the first shell segment 1 and the second shell segment 2 of the vacuum chamber cover 11 that meet service requirements.

[0043] In some embodiments, the hyperboloidal die portion 3 of the second module has a chamfer on the side facing the center of the axis of the formed concave surface. The hyperboloidal die portion 3 of the second module has an extended outer arc surface and a contracted inner arc surface. Therefore, when the second shell segment 2 is formed using the second module, the sheet thickness of the second shell segment 2 on the inner arc surface of the hyperboloidal die portion 3 of the second module will increase, which can easily lead to die jamming at this location. Therefore, referring to... Figure 2 The hyperboloidal concave mold part 3 of the second module is chamfered on the side facing the center of the axis of the forming concave surface. The chamfer is designed to increase the space for easy jamming, which helps the forming and demolding processes of the second module to proceed smoothly.

[0044] In some embodiments, the minimum thickness of the single-curved die portion 4 of the first module is greater than or equal to 20 mm; and / or, the minimum thickness of the double-curved die portion 3 of the second module is greater than or equal to 20 mm. This benefits the vacuum chamber cover machining mold by providing better rigidity and reducing deformation during processing and use.

[0045] In some embodiments, the mold used for processing the vacuum chamber cover has the same chemical composition as the vacuum chamber cover 11. This helps to reduce changes in the elemental composition of the surface of the vacuum chamber cover 11 caused by the infiltration of different elements from different materials during the manufacturing process.

[0046] In some embodiments, in the first module, the single-curved die portion 4 and the single-curved punch portion 6 are detachably connected; and / or, in the second module, the hyperboloid die portion 3 and the hyperboloid punch portion 5 are detachably connected.

[0047] In some embodiments, a sealing plate 7 is also included, as shown in the reference. Figure 3 The sealing plate 7 has several positioning holes 10; the single-curved surface die part 4 has a first fixing part with an elongated hole 8, and the first fixing part is connected to the sealing plate 7 by bolts passing through the elongated hole 8; the double-curved surface die part 3 has a second fixing part with an elongated hole 8, and the second fixing part is connected to the sealing plate 7 by bolts passing through the elongated hole 8. (Reference) Figure 1 and Figure 2 The vacuum chamber shell cover processing mold proposed in this application can be used as a processing tooling for assembling the first shell section 1 and / or the second shell section 2. By connecting the first module and / or the second module with the sealing plate 7, it can assist in assembling several first shell sections 1 and second shell sections 2 together. The first fixed part of the single-curved concave mold part 4 of the first module is fastened to the sealing plate 7 by bolts, or the second fixed part of the double-curved concave mold part 3 of the second module is fastened to the sealing plate 7 by bolts. The first shell section 1 and the second shell section 2 can be pressed and fixed in a shape and position suitable for welding. The butt weld of the first shell section 1 and the second shell section 2 is completed by a handheld laser welding machine, thereby preparing the vacuum chamber shell cover 11.

[0048] In a second aspect of this application, a method for manufacturing a vacuum chamber shell cover 11 is provided, with reference to... Figure 4-Figure 6 The shell section 1 is prepared using the vacuum chamber shell cover processing mold proposed in this application, comprising: pressing a first blanking plate into shape using a first module to obtain a first shell section 1; the first blanking plate includes a straight plate; pressing a second blanking plate into shape using a second module to obtain a second shell section 2; the second blanking plate includes a fan-shaped plate.

[0049] In some embodiments, the radius of the forming surface of the single-curved die portion 4 of the first module is 85%-95% of the radius of the first shell segment 1; and / or, the radius of the forming surface of the double-curved die portion 3 of the second module is 105%-115% of the radius of the second shell segment 2. As an example, when the radius of curvature of the vacuum chamber cover 11 is 10mm, the radius of the forming surface of the single-curved die portion 4 of the first module is 1mm smaller than the theoretically required size of the vacuum chamber cover 11, which helps to offset springback after pressing. The radius of the forming surface of the double-curved die portion 3 of the second module is 2mm larger than the radius of the forming surface of the corresponding single-curved die portion 4 of the first module, and 1mm larger than the radius of the second shell segment 2. Therefore, the prepared second shell segment 2 can be connected to the corresponding size of the first shell segment 1, meeting the requirements.

[0050] In some embodiments, the first shell segment 1 and the second shell segment 2 are respectively assembled in the first module and the second module, and the first module and the second module are fixed on the sealing plate 7 for welding and positioning; after welding and positioning, the corresponding welds of the first shell segment 1 and the second shell segment 2 are welded to prepare the vacuum chamber shell cover 11.

[0051] The method proposed in this application enables high-precision forming of the first shell segment 1 and the second shell segment 2 made of stainless steel sheet materials with different curvatures. This facilitates welding using low-heat-input methods such as handheld laser welding, effectively reducing welding deformation. After welding, deformation is suppressed by fixing the vacuum chamber shell cover with a machining mold, simplifying the stress-relieving treatment required in the machining process. By performing annealing heat treatment only after welding, the structural stress and deformation of the prepared vacuum chamber shell cover 11 are reduced. Furthermore, the assembly tooling, forming mold, and sealing plate 7 share a common structure in this method, saving costs and ensuring dimensional consistency of the prepared vacuum chamber shell cover 11. (Reference) Figure 3 Leak detection holes 12 can be set on the sealing plate 7. A sealing test can be carried out using the vacuum chamber shell cover machining mold. This method can efficiently test the sealing performance of the vacuum chamber shell cover 11 under simulated working conditions.

[0052] In some embodiments, the welding positioning can be performed using a handheld laser welder. This reduces heat input to the vacuum chamber shell during welding, and minimizes deformation or shell material changes that occur during the welding process.

[0053] In some embodiments, the welding positioning can be performed by argon arc welding.

[0054] In some embodiments, the process further includes: after the welding process, annealing heat treatment is performed on the vacuum chamber shell cover 11 and the vacuum chamber shell cover processing mold, wherein the annealing heat treatment temperature is 300℃-350℃ and the annealing heat treatment time is 3h-6h. This eliminates the structural stress accumulated in the vacuum chamber shell cover 11 during the manufacturing process and reduces minor deformation caused by residual stress.

[0055] In some embodiments, the method further includes: sealing the connection between the vacuum chamber shell cover 11 and the vacuum chamber shell cover processing mold using vacuum putty 9, followed by a heating treatment to perform a sealing test. As an example, such as... Figure 7 As shown, the vacuum chamber shell cover and sealing plate 7 are sealed with vacuum putty 9, then baked to 150℃-200℃ and stabilized at this temperature for about 2 hours. This process is repeated three times. Finally, a vacuum of 1x10 is drawn through the leak detection hole 12 on the sealing plate 7. -10 Pa·m 3 ·s -1 Check the pressure changes and the outline dimensions of the vacuum chamber cover. If the pressure gauge reading remains unchanged, it indicates that the vacuum chamber cover 11 has no leakage defects and its overall sealing is good. Further testing can be done using an arc-shaped template to check the outline of the vacuum chamber cover 11, ensuring the test results are essentially consistent with those before the pressure test.

[0056] As an example, a method for preparing the vacuum chamber shell cover 11 includes:

[0057] (1) Parts are cut using laser cutting;

[0058] (2) The press is formed by pressing multiple times using a press and vacuum chamber shell cover processing mold. The pressing pressure is required to be in the range of 600-800 tons, and the holding time after pressing is ≥10 seconds.

[0059] (3) The assembly mold for vacuum chamber shell cover is used as a tooling. The four first shell section 1 and four second shell section 2 arc plates are assembled together using the assembly tooling. The first fixing part and the second fixing part of the tooling are fastened to the sealing plate 7 by bolts.

[0060] (4) The butt weld of the first shell section 1 and the second shell section 2 is completed using a handheld laser welding machine;

[0061] (5) The welded vacuum chamber shell cover 11, together with the vacuum chamber shell cover processing mold, is subjected to low-temperature annealing heat treatment as a tooling to eliminate structural stress.

[0062] (6) Unpack the fixture and perform non-destructive testing on the dimensions of the vacuum chamber shell cover. The profile deviation is required to be ≤2mm and the penetrant and radiographic testing must be qualified.

[0063] (7) The sealing performance and structural strength of the vacuum chamber shell cover 11 are tested using a positive pressure test method. The vacuum chamber shell cover and the sealing plate 7 are sealed with vacuum mud 9. The leak detection hole 12 is connected to a helium mass spectrometer. The vacuum test is conducted to ensure that the leak rate is not less than 1x10. -10 Pa·m 3 ·s -1 .

[0064] In a third aspect of this application, reference is made to Figure 8 This application proposes a vacuum chamber shell cover 11, which is prepared by the method proposed in this application. The vacuum chamber shell cover 11 includes a plurality of first shell segments 1 and at least four second shell segments 2. The first shell segments 1 are straight segments, the second shell segments 2 are arc-shaped and have equal radii, the central angle of each of the second shell segments 2 is 90 degrees, and the two ends of the second shell segments 2 are respectively connected to different first shell segments 1.

[0065] The following specific embodiments illustrate the solution of this application. It should be noted that these embodiments are for illustrative purposes only and should not be considered as limiting the scope of this application. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0066] Example 1

[0067] (1) Austenitic stainless steel sheet, 3.5mm thick, cut by laser cutting;

[0068] (2) After the first module and the second module are assembled with the sheet metal, they are pressed into shape by a press 3-5 times. The press pressure is 600-800 tons and the holding time after pressing is 10 seconds, so as to prepare the first shell section 1 and the second shell section 2 respectively. After pressing, the accuracy of the arc surface is tested by a 1:1 template. The gap between the template and the arc surface is required to be within 2mm to be qualified.

[0069] (3) Assemble the first shell section 1 and the second shell section 2 with the first module and the second module respectively, and fix the assembled first shell section 1 and the first module, the second shell section 2 and the second module by bolting. The weld spacing between the first module, the second module and the first shell section 1 and the second shell section 2 is reserved by 10mm. Weld the first shell section 1 and the second shell section 2 in sequence to complete the assembly of the entire shell cover. Use a handheld laser welding machine to complete the welding in sequence. The laser power is 1800W-2200W.

[0070] (4) Repeat step (3) to complete the self-fusion welding of the complete vacuum chamber shell cover 11 to prepare the vacuum chamber shell cover 11;

[0071] (5) The welded vacuum chamber shell cover 11, together with the first module and the second module assembled with it, is subjected to low-temperature annealing heat treatment at a temperature of 300℃-350℃ and held for 3-6 hours.

[0072] (6) Disassemble the first module and the second module, and use penetrant and X-ray inspection to perform non-destructive testing on the vacuum chamber shell cover 11. The non-destructive testing is required to be free of defects. Measure the center distance and outer edge distance of the vacuum chamber shell cover 11, and use a template to perform contour inspection. The deviation is required to be ≤2mm.

[0073] (7) Seal the space between the vacuum chamber cover 11 and the sealing plate 7 with vacuum sealant 9, then bake and heat to 150℃-200℃ and stabilize for about 2 hours. Repeat this process three times. Finally, evacuate to 1x10 through the leak detection hole 12. -10 Pa·m 3 ·s -1 Check the pressure value change and profile dimensions. If the pressure gauge value does not change, it proves that there is no leakage and the overall sealing is good. Use an arc template to check the profile, which should be basically consistent with that before the pressure test.

[0074] In the description of this application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0075] In the description of this application, 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 technical features indicated. "First feature" and "second feature" may include one or more of the indicated feature.

[0076] In the description of this application, "multiple" means two or more.

[0077] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0078] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0079] In the description of this application, "A and / or B" can include any of the cases of A alone, B alone, or A and B, where A and B are merely examples and can be any technical feature connected by "and / or" in this application.

[0080] In the description of this application, "same chemical composition" should be interpreted broadly, that is, the main components of the two have the same chemical composition, or the two have substantially the same chemical composition, but may have errors or impurities within the acceptable range that can be understood by those skilled in the art.

[0081] In this application, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic. Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. For example, if the method includes steps (a) and (b), it means that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, if the method may also include step (c), it means that step (c) can be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0082] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A mold for processing a vacuum chamber shell cover, characterized in that, include: A first module and a second module, wherein the first module is used to process and install the first shell section of the vacuum chamber shell cover, and the second module is used to process and install the second shell section of the vacuum chamber shell cover; The first module includes a single-curved surface concave die (4) and a single-curved surface convex die (6), which are detachably connected. The forming surface of the single-curved concave mold part (4) is a cylindrical groove surface, and the forming surface of the single-curved convex mold part (6) is a cylindrical convex ridge surface; the cross-sectional profile of the cylindrical groove surface and the cylindrical convex ridge surface in the matching state is a concentric circular arc. The second module includes a hyperboloid concave die (3) and a hyperboloid convex die (5), which are detachably connected. The forming surface of the hyperboloid concave mold part (3) is a curved cylindrical groove surface. The curved cylindrical groove surface includes a forming concave surface. In the plane where the two edge lines of the forming concave surface extend along the axial direction are located, the axis of the forming concave surface is a single curvature arc. The forming surface of the hyperboloid punch (5) is a curved cylindrical ridge surface. The curved cylindrical ridge surface includes a forming convex surface. In the plane where the two edge lines of the forming convex surface extend along the axial direction are located, the axis of the forming convex surface is a single curvature arc. The cross-sectional profile of the curved cylindrical groove surface and the curved cylindrical ridge surface in the matching state is a concentric circular arc. The radius of the forming surface of the single-curved die part (4) is 85%-95% of the radius of the first shell segment (1); the radius of the forming surface of the double-curved die part (3) is 105%-115% of the radius of the second shell segment (2). The mold also includes a sealing plate (7), a first fixing part is provided on the single-curved surface cavity part (4), the first fixing part is connected to the sealing plate (7), and a second fixing part is provided on the double-curved surface cavity part (3), the second fixing part is connected to the sealing plate (7).

2. The vacuum chamber shell cover processing mold according to claim 1, characterized in that, The cavity height between the molding surface of the single-curved concave mold portion (4) of the first module and the cylindrical convex ridge surface is 3.5mm-4.5mm; and / or, The cavity height between the molding surface of the hyperboloid concave die (3) and the molding surface of the hyperboloid convex die (5) of the second module is 3.5mm-4.5mm.

3. The vacuum chamber shell cover processing mold according to claim 1, characterized in that, The hyperboloidal concave mold portion (3) of the second module has a chamfer on the side facing the center of the axis of the formed concave surface.

4. The vacuum chamber shell cover machining mold according to any one of claims 1-3, characterized in that, The minimum thickness of the single-curved surface concave mold portion (4) of the first module is greater than or equal to 20 mm; and / or, The minimum thickness of the hyperboloid concave part (3) of the second module is greater than or equal to 20 mm.

5. The vacuum chamber shell cover processing mold according to claim 1, characterized in that, The sealing plate (7) is provided with a plurality of positioning holes (10); The first fixing part is provided with an elongated hole (8), and the first fixing part is connected to the sealing plate (7) by bolts passing through the elongated hole (8); The second fixing part is provided with an elongated hole (8), and the second fixing part is connected to the sealing plate (7) by bolts passing through the elongated hole (8).

6. A method for preparing a vacuum chamber shell cover, characterized in that, The vacuum chamber shell cover is prepared using the machining mold according to any one of claims 1-5, comprising: The first blanking plate is pressed and formed using the first module to obtain the first shell segment (1); the first blanking plate includes a straight plate; The second blanking plate is pressed and formed using the second module to obtain the second shell segment (2); the second blanking plate includes a fan-shaped plate; The first shell segment (1) and the second shell segment (2) are respectively assembled into the first module and the second module, and the first module and the second module are fixed on the sealing plate (7) for welding and positioning. After welding and positioning, the corresponding welds of the first shell section (1) and the second shell section (2) are welded to prepare the vacuum chamber shell cover; The radius of the forming surface of the single-curved die part (4) of the first module is 85%-95% of the radius of the first shell segment (1), and the radius of the forming surface of the double-curved die part (3) of the second module is 105%-115% of the radius of the second shell segment (2).

7. The method according to claim 6, characterized in that, Also includes: After the welding process, the vacuum chamber shell cover and the vacuum chamber shell cover processing mold are subjected to annealing heat treatment, wherein the annealing heat treatment temperature is 300℃-350℃ and the annealing heat treatment time is 3h-6h.

8. The method according to claim 6, characterized in that, Also includes: The connection between the vacuum chamber shell cover and the vacuum chamber shell cover processing mold is sealed and heated to conduct a sealing test.

9. A vacuum chamber shell cover, characterized in that, Prepared by the method according to any one of claims 6-8 The vacuum chamber cover includes several first shell segments (1) and at least four second shell segments (2). The first shell segments (1) are straight segments, and the second shell segments (2) are arc-shaped with equal radii. The central angle of each second shell segment (2) is 90 degrees. The two ends of each second shell segment (2) are connected to different first shell segments (1).

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