Vacuum chamber shell cover machining mold, method for preparing vacuum chamber shell cover and vacuum chamber shell cover

Abstract

The invention relates to the technical field of Tokamak devices, and discloses a vacuum chamber shell cover machining mold, a vacuum chamber shell cover manufacturing method and a vacuum chamber shell cover, the vacuum chamber shell cover machining mold comprises a plurality of first shell sections and at least four second shell sections, the first shell sections are linear sections, the second shell sections are arc-shaped and equal in radius, the center angles of the second shell sections are all 90 degrees, and the center angles of the second shell sections are all 90 degrees. The two ends of the second shell section are connected with the different first shell sections respectively. The vacuum chamber shell cover has good sealing performance and stress resistance, and can well meet the service requirements of a vacuum chamber window of a Tokamak device.

Description

Technical Field

[0001] The present application relates to the technical field of tokamak devices, and in particular to a vacuum chamber shell cover processing mold, a method for preparing a vacuum chamber shell cover, and a vacuum chamber shell cover. Background Art

[0002] During tokamak operation, internal production conditions must be observed through the vacuum chamber window. A flexible vacuum chamber cover seals the vacuum chamber window and is required to withstand long-term operation under conditions such as high and low temperature fluctuations and pressure fluctuations. While this flexible cover offers excellent structural strength and sealing performance, it also places extremely high demands on the manufacturing process, requiring high processing efficiency, forming accuracy, material microstructure, and minimal welding distortion.

[0003] In related technologies, vacuum chamber covers can be manufactured using additive manufacturing. This method can achieve complex structures, but it can also present issues such as high porosity, lack of fusion, and cracks. Furthermore, high-temperature resistance requires higher material performance, which additive manufacturing cannot guarantee.

[0004] Alternatively, the vacuum chamber cover can be manufactured through forging. This method can achieve excellent combination and control of the chemical composition of the shell material, ensuring that the mechanical properties and functionality of the vacuum chamber cover meet the requirements of high-temperature, high-pressure, and radiation-resistant operating conditions. However, this method has a complex process flow and high requirements for melting equipment, making it unsuitable for small-batch manufacturing.

[0005] The flexible sealing shell cover of the vacuum chamber window has the structural characteristics of thin plate and large deformation curvature. If the forging processing method is adopted, it is necessary to go through the process of melting steel ingots, electroslag remelting, steel billet forging, machining and other processes, and the welding efficiency is low. The use of laser additive technology has defects such as large product porosity and unfused, and the material performance does not meet the requirements. The integrated pressing method is used for manufacturing. Due to the thin plate, large curvature and complex structure, severe edge curling deformation is prone to occur. Therefore, the preparation method of the existing technology has the problems of low processing efficiency, large deformation, low precision, poor organizational performance, etc., which makes it difficult to meet the performance requirements for preparing a sealed vacuum chamber shell cover.

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

[0007] In a first aspect of the present application, the present application proposes a vacuum chamber shell cover processing mold, comprising: a first mold group and a second mold group; the first mold group comprises a single-curved concave mold part and a single-curved convex mold part, the molding surface of the single-curved concave mold part is a cylindrical groove surface, and the molding surface of the single-curved convex mold part 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 mold group comprises a hyperbolic concave mold part and a hyperbolic convex mold part, the molding surface of the hyperbolic concave mold part is a curved cylindrical groove surface, The curved cylindrical groove surface includes a formed concave surface, and within the plane where the edge lines on both sides extending along the axial direction of the formed concave surface are located, the axis line of the formed concave surface is a single curvature arc; the forming surface of the hyperbolic punch portion is a curved cylindrical convex ridge surface, and the curved cylindrical convex ridge surface includes a formed convex surface, and within the plane where the edge lines on both sides extending along the axial direction of the formed convex surface are located, the axis line of the formed convex 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 mold part of the first mold group and the molding surface of the cylindrical ridge surface is 3.5mm-4.5mm; and / or, the cavity height between the molding surface of the hyperbolic concave mold part of the second mold group and the molding surface of the hyperbolic convex mold part is 3.5mm-4.5mm.

[0009] In some embodiments, a chamfer is provided on a side of the double-curved concave mold portion of the second mold assembly that faces the center of the axis of the forming concave curved surface.

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

[0011] In some embodiments, in the first mold set, the single-curved concave mold portion and the single-curved convex mold portion are detachably connected; and / or, in the second mold set, the double-curved concave mold portion and the double-curved convex mold portion are detachably connected.

[0012] In some embodiments, a sealing plate is further included, on which a plurality of positioning holes are provided; a first fixing portion is provided on the single-curved die portion, on which an oblong hole is provided, and the first fixing portion is connected to the sealing plate by a bolt passing through the oblong hole; a second fixing portion is provided on the hyperbolic die portion, on which an oblong hole is provided, and the second fixing portion is connected to the sealing plate by a bolt passing through the oblong hole.

[0013] In the second aspect of the present application, the present application proposes a method for preparing a vacuum chamber shell cover, which is prepared using the vacuum chamber shell cover processing mold proposed in the present application, including: using a first module to press-form a first blanking plate to obtain a first shell segment; the first blanking plate includes a straight plate; using a second module to press-form a second blanking plate 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 double-curved 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 positioning; after welding 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, performing an annealing heat treatment on the vacuum chamber shell cover and the vacuum chamber shell cover processing mold, wherein the annealing heat treatment temperature is 300° C.-350° C., and the annealing heat treatment time is 3 hours-6 hours.

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

[0018] In the third aspect of the present application, the present application proposes a vacuum chamber shell cover, which is prepared by the method proposed in the present application, and the vacuum chamber shell cover includes several first shell segments and at least 4 second shell segments, the first shell segments are straight segments, the second shell segments are arc-shaped and have equal radii, the central angles of the second shell segments are all 90 degrees, and the two ends 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 vacuum chamber shell cover processing mold proposed in this application can be used to process and install the vacuum chamber shell cover, and can also be used in combination with a tooling and a sealing plate, etc., to further complete welding assembly, stress relief treatment, efficient testing of sealing and structural strength and other necessary production links.

[0020] The method proposed in this application for manufacturing a vacuum chamber cover utilizes a process involving curved sheet bending, integrated tooling assembly, laser welding of the weld seams, and low-temperature annealing to eliminate structural stress. This method achieves the welding of a thin-walled vacuum chamber window with a flexible seal. Compared to existing technologies, the method described in this application offers advantages such as high processing efficiency, minimal deformation, high precision, and excellent material structural properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 This is a schematic cross-sectional diagram of the assembly of the first module and the first shell segment in one embodiment of the present application; Figure 2 This is a schematic cross-sectional view of the assembly of the second module and the second shell segment in one embodiment of the present application; Figure 3 This is a structural diagram of a sealing plate in one embodiment of the present application; Figure 4 This is a schematic plan view of a vacuum chamber cover in which the first shell segment and the second shell segment are welded together to form a quarter of the cover in one embodiment of the present application; Figure 5 This is a schematic plan view of a vacuum chamber cover in which the first shell segment and the second shell segment are welded together to form 1 / 2 in one embodiment of the present application; Figure 6 This is a schematic plan view of a first shell segment and a second shell segment welded together to form a complete vacuum chamber shell cover in one embodiment of the present application; Figure 7 A schematic plan view of a vacuum chamber cover for performing a sealing test in one embodiment of the present application; Figure 8 This is a schematic diagram of a vacuum chamber cover in one embodiment of the present application.

[0022] Description of reference numerals: First shell section 1; second shell section 2; hyperbolic surface die portion 3; single curved surface die portion 4; hyperbolic surface punch portion 5; single curved surface punch portion 6; sealing plate 7; oblong hole 8; vacuum mud 9; positioning hole 10; vacuum chamber cover 11; leak detection hole 12. DETAILED DESCRIPTION

[0023] The following describes the embodiments of the present application in detail. Examples of the embodiments are shown in the accompanying drawings, but unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially identical structures may be omitted. This is to avoid unnecessary lengthiness in the following description and to facilitate understanding by those skilled in the art. In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present application and are not intended to limit the subject matter described in the claims.

[0024] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field to which this application belongs; the terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application; unless otherwise specified, the numerical values of the various parameters mentioned in this application can be measured using various measurement methods commonly used in the art (for example, they can be tested according to the methods given in the embodiments of this application).

[0025] The terms "include" and "have" in the description and claims of this application and any variations thereof are open expressions, that is, including the contents specified in this application but not excluding other contents.

[0026] In the description of this application, all numbers disclosed herein are approximate, regardless of whether the word "about" or "approximately" is used. The value of each number may vary by less than 10% or by a reasonable difference considered by a person skilled in the art, such as 1%, 2%, 3%, 4% or 5%.

[0027] " range " disclosed in the present application is limited in the form of lower limit and upper limit, and given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of special range. The scope limited in this way can be to include end value or not include end value, and can be arbitrarily combined, that is, any lower limit can form a range with any upper limit combination. For example, if the scope of 60-120 and 80-110 is listed for specific parameters, it is understood that the scope of 60-110 and 80-120 is also expected. In addition, if the minimum range value 1 and 2 are listed, and if the maximum range value 3,4 and 5 are listed, then the following range can all be expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In this application, unless otherwise specified, the numerical range " ab " represents the abbreviation of any real number combination between a and b, wherein a and b are all real numbers. For example, a numerical range of "0-5" indicates that all real numbers between "0-5" are listed herein, and "0-5" is simply an abbreviation for these numerical combinations. Furthermore, when a parameter is expressed as an integer ≥ 2, this is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0028] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0029] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0030] In the first aspect of the present application, the present application proposes a vacuum chamber shell cover processing mold, referring to Figure 1 and Figure 2 , including: a first die set and a second die set; the first die set includes a single-curved concave die portion 4 and a single-curved convex die portion 6, the molding surface of the single-curved concave die portion 4 is a cylindrical groove surface, and the molding surface of the single-curved convex die portion 6 is a cylindrical convex ridge surface; the cross-sectional profile of the cylindrical groove surface and the cylindrical convex ridge surface in the adaptation state is a concentric arc; the second die set includes a hyperbolic concave die portion 3 and a hyperbolic convex die portion 5, the molding surface of the hyperbolic concave die portion 3 is a curved cylindrical groove surface, and the curved cylindrical groove surface includes a molding Concave surface, in the plane where the two side edge lines extending along the axial direction of the formed concave surface are located, the axis line of the formed concave surface is a single curvature arc; the forming surface of the hyperbolic punch part 5 is a curved cylindrical convex ridge surface, and the curved cylindrical convex ridge surface includes a formed convex surface, in the plane where the two side edge lines extending along the axial direction of the formed convex surface are located, the axis line of the formed convex 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.

[0031] The vacuum chamber shell cover processing mold proposed in the present application includes a first module that can be used to process and install the first shell segment 1 of the vacuum chamber shell cover 11 and a second module that can be used to process and install the second shell segment 2 of the vacuum chamber shell cover 11. The material of the vacuum chamber shell cover 11 includes austenitic stainless steel. The vacuum chamber shell cover processing mold proposed in the present application can be used to set the cut thin plate-shaped steel material on the forming surface of the first module and / or the second module, and press-formed by a press. The first shell segment 1 and the second shell segment 2 after press forming are assembled with the vacuum chamber shell cover processing mold as a tooling, and used in combination with the sealing plate 7, etc., to further complete welding assembly, stress relief treatment, efficient testing of sealing and structural strength and other necessary production links. Therefore, the method proposed in the present application has the advantages of high processing efficiency, small product deformation, high precision, and excellent material structure and performance.

[0032] In some embodiments, the cavity height between the molding surface of the single-curved concave mold portion 4 of the first mold assembly and the cylindrical ridge surface is 3.5 mm to 4.5 mm; and / or the cavity height between the molding surface of the double-curved concave mold portion 3 of the second mold assembly and the molding surface of the double-curved punch portion 5 of the second mold assembly is 3.5 mm to 4.5 mm. The vacuum chamber cover 11 is required to withstand significant shear deformation (greater than 7 mm) during service. Therefore, a thickness of 3 mm to 4 mm in the vacuum chamber cover 11 is beneficial for meeting the overall operational requirements of the vacuum chamber cover 11 during service. Considering the amount of thinning required during the molding process, the cavity height between the molding surface of the single-curved concave mold portion 4 of the first mold assembly and the cylindrical ridge surface, and the cavity height between the molding surface of the double-curved concave mold portion 3 of the second mold assembly and the molding surface of the double-curved punch portion 5 of the second mold assembly, within the aforementioned range, facilitates the production of first and second shell segments 1 and 2 of the vacuum chamber cover 11 that meet service requirements.

[0033] In some embodiments, the second die set's double-curved concave mold part 3 is chamfered on the side facing the centerline of the axis of the forming concave surface. The second die set's double-curved concave mold part 3 has an outer arc surface that extends and an inner arc surface that contracts. Therefore, when the second die set is used for press forming to prepare the second shell segment 2, the thickness of the sheet material of the second shell segment 2 on the inner arc surface of the second die set's double-curved concave mold part 3 will increase, making it easy for the die to get stuck. Therefore, referring to Figure 2 The chamfer is processed on the side of the center of the axis of the forming concave surface of the hyperbolic concave mold part 3 of the second mold group. The setting of the chamfer is conducive to increasing the space for the easy-to-clamp mold position, which helps to smoothly carry out the pressing process and demolding process using the second mold group.

[0034] In some embodiments, the minimum thickness of the single-curved concave mold portion 4 of the first mold assembly is greater than or equal to 20 mm; and / or the minimum thickness of the double-curved concave mold portion 3 of the second mold assembly is greater than or equal to 20 mm. This helps ensure that the mold for processing the vacuum chamber cover has good rigidity and reduces deformation during processing and use.

[0035] In some embodiments, the vacuum chamber cover processing mold has the same chemical composition as the vacuum chamber cover 11. This helps to reduce the change of element composition on the surface of the vacuum chamber cover 11 caused by the penetration of different elements in different materials during the preparation process.

[0036] In some embodiments, in the first mold assembly, the single-curved concave mold portion 4 and the single-curved convex mold portion 6 are detachably connected; and / or, in the second mold assembly, the double-curved concave mold portion 3 and the double-curved convex mold portion 5 are detachably connected.

[0037] In some embodiments, a sealing plate 7 is also included. Figure 3, the sealing plate 7 is provided with a plurality of positioning holes 10; the single-curved die portion 4 is provided with a first fixing portion, the first fixing portion is provided with an oblong hole 8, and the first fixing portion is connected to the sealing plate 7 by a bolt passing through the oblong hole 8; the double-curved die portion 3 is provided with a second fixing portion, the second fixing portion is provided with an oblong hole 8, and the second fixing portion is connected to the sealing plate 7 by a bolt passing through the oblong hole 8. Figure 1 and Figure 2 The vacuum chamber shell cover processing mold proposed in the present application can be used as a processing tool for assembling the first shell segment 1 and / or the second shell segment 2. By connecting the first module and / or the second module with the sealing plate 7, it can assist in assembling a plurality of first shell segments 1 and second shell segments 2 together. The oblong hole 8 of the first fixing portion on the single-curved die portion 4 of the first module is fastened to the sealing plate 7 by bolts, or the oblong hole 8 of the second fixing portion on the hyperbolic die portion 3 of the second module is fastened to the sealing plate 7 by bolts. The first shell segment 1 and the second shell segment 2 can be pressed and fixed in a form and position suitable for welding, and a handheld laser welding machine is used to complete the butt welding of the first shell segment 1 and the second shell segment 2, thereby preparing the vacuum chamber shell cover 11.

[0038] In the second aspect of the present application, the present application proposes a method for preparing a vacuum chamber cover 11, referring to Figure 4-Figure 6 , is prepared using the vacuum chamber shell cover processing mold proposed in this application, including: using a first module to press-form a first blanking plate to obtain a first shell segment 1; the first blanking plate includes a straight plate; using a second module to press-form a second blanking plate to obtain a second shell segment 2; the second blanking plate includes a fan-shaped plate.

[0039] In some embodiments, the radius of the molding surface of the single-curved die portion 4 of the first die set is 85%-95% of the radius of the first shell segment 1; and / or the radius of the molding surface of the double-curved die portion 3 of the second die set is 105%-115% of the radius of the second shell segment 2. For example, if the radius of the vacuum chamber cover 11 is 10 mm, the radius of the molding surface of the single-curved die portion 4 of the first die set is 1 mm smaller than the theoretical required size of the vacuum chamber cover 11, which helps to offset springback after pressing. The radius of the molding surface of the double-curved die portion 3 of the second die set is 2 mm larger than the radius of the corresponding molding surface of the single-curved die portion 4 of the first die set and 1 mm larger than the radius of the second shell segment 2. As a result, the prepared second shell segment 2 can be dimensionally aligned with the corresponding first shell segment 1, meeting the requirements.

[0040] 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 positioning; after welding 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.

[0041] The method proposed in the present application can achieve high-precision forming of the first shell segment 1 and the second shell segment 2 made of stainless steel thin plates with different curvatures, which is conducive to welding processing by low heat input energy methods such as handheld laser welding, effectively reducing welding deformation. After welding, the deformation is suppressed by fixing the vacuum chamber shell cover processing mold, which can simplify the stress relief treatment required in the processing method. By performing annealing heat treatment only after the welding process, the structural stress and deformation of the prepared vacuum chamber shell cover 11 can be reduced. In addition, the assembly tooling, forming mold and sealing plate 7 in this method adopt a common structure, which not only saves costs but also helps to ensure the consistency of the size of the prepared vacuum chamber shell cover 11. Reference Figure 3 A leak detection hole 12 can be set on the sealing plate 7, and a sealing test can be performed using a vacuum chamber shell cover processing mold. This method can efficiently detect the sealing performance of the vacuum chamber shell cover 11 under simulated working conditions.

[0042] In some embodiments, the welding positioning can be performed by handheld laser welding, thereby reducing the heat input to the vacuum chamber shell during the welding process and reducing deformation or shell material changes during the welding process.

[0043] In some embodiments, the welding position can be welded by argon arc welding.

[0044] In some embodiments, the process further includes: performing an annealing heat treatment on the vacuum chamber cover 11 and the vacuum chamber cover processing mold after the welding process, wherein the annealing heat treatment temperature is 300°C-350°C and the annealing heat treatment time is 3 hours-6 hours. This can eliminate the structural stress accumulated in the vacuum chamber cover 11 during the manufacturing process and reduce the slight deformation caused by residual stress.

[0045] In some embodiments, the method further comprises: using vacuum mud 9 to seal the connection between the vacuum chamber cover 11 and the vacuum chamber cover processing mold, and performing a temperature treatment to perform a sealing test. Figure 7 As shown, the vacuum chamber cover and the sealing plate 7 are sealed with vacuum mud 9, and then baked to 150℃-200℃, and stabilized in this temperature range for about 2 hours, and repeated three times. Finally, vacuum is drawn to 1x10 -10 Pa·m 3 ·s -1Check the pressure gauge and the dimensions of the vacuum chamber cover. If the pressure gauge does not change, the vacuum chamber cover 11 is leak-free and has a good overall seal. A curved template can be used to test the contour of the vacuum chamber cover 11, ensuring the test results are consistent with those before the pressure test.

[0046] As an example, the method for preparing the vacuum chamber cover 11 includes: (1) Use laser cutting to complete parts cutting; (2) Use a press and a vacuum chamber shell cover processing mold to press and form multiple times. The pressing pressure is required to be within the range of 600-800 tons, and the holding time after pressing is ≥10 seconds; (3) Assembling the vacuum chamber shell cover processing mold as a tooling, using the assembly tooling to assemble the four first shell segments 1 and the four second shell segments 2 arc plates together, and fastening the first fixing part and the second fixing part of the tooling to the sealing plate 7 respectively by bolts; (4) Use a handheld laser welding machine to complete the butt weld of the first shell section 1 and the second shell section 2; (5) The welded vacuum chamber cover 11 and the vacuum chamber cover processing mold are subjected to low-temperature annealing heat treatment together as a tooling to eliminate tissue stress; (6) Unpack the tooling and conduct vacuum chamber shell size and non-destructive testing, requiring the profile deviation to be ≤2mm and the penetration and radiographic flaw detection to be qualified; (7) Use positive pressure test to detect the sealing and structural strength of the vacuum chamber cover 11. The vacuum chamber cover and the sealing plate 7 are sealed with vacuum mud 9. The leak detection hole 12 is connected to the helium mass spectrometer. The vacuum test leak rate is required to be no less than 1x10 -10 Pa·m 3 ·s -1 .

[0047] In the third aspect of this application, reference is made to Figure 8 The present application proposes a vacuum chamber shell cover 11, which is prepared using the method proposed in the present application. The vacuum chamber shell cover 11 includes several first shell segments 1 and at least 4 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 angles of the second shell segments 2 are all 90 degrees, and the two ends of the second shell segments 2 are respectively connected to different first shell segments 1.

[0048] The present invention will be described below by way of specific examples. It should be noted that the following examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Where specific techniques or conditions are not specified in the examples, they are determined according to the techniques or conditions described in the literature in this area or according to the product specifications. Reagents or instruments not specified by manufacturer are all commercially available conventional products.

[0049] Example 1 (1) Austenitic stainless steel plate, thickness 3.5 mm, cut by laser; (2) After the first die set and the second die set are assembled with the plate, they are pressed 3-5 times using a press with a pressure of 600-800 tons and a holding time of 10 seconds to prepare the first shell segment 1 and the second shell segment 2 respectively; after pressing, the arc surface accuracy is tested using a 1:1 mold, and the gap between the mold and the arc surface is required to be within 2mm to be qualified; (3) Assemble the first shell segment 1 and the second shell segment 2 with the first module and the second module respectively, and complete the assembly by bolting the assembled first shell segment 1 and the first module, and the second shell segment 2 and the second module. Leave a 10mm spacing between the welds of the first module, the second module, the first shell segment 1 and the second shell segment 2, and weld the first shell segment 1 and the second shell segment 2 in sequence to complete the assembly of the entire shell cover. Use a handheld laser welding machine to complete the welding in sequence, with a laser power of 1800W-2200W; (4) Repeat step (3) to complete the autogenous welding of the complete vacuum chamber shell cover 11 to prepare the vacuum chamber shell cover 11; (5) The welded vacuum chamber cover 11 together with the first module and the second module assembled therewith are subjected to low-temperature annealing heat treatment at a temperature of 300°C-350°C for 3-6 hours; (6) Untie the first module and the second module, and perform nondestructive testing on the prepared vacuum chamber cover 11 by using penetration and radiographic testing methods, requiring that the nondestructive testing is defect-free; measure the center distance and outer margin of the vacuum chamber cover 11, and use a template to perform contour testing, requiring that the deviation is ≤ 2 mm; (7) Seal the vacuum chamber cover 11 and the sealing plate 7 with vacuum mud 9, then bake and heat to 150℃-200℃ for about 2 hours, repeat three times, and finally evacuate the vacuum chamber through the leak detection hole 12 to 1x10 -10 Pa·m 3 ·s -1 , check the pressure value change and contour size. 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 detect the contour, which is required to be basically consistent with that before the pressure test.

[0050] In the description of this application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They 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, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0051] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the quantity of the technical features indicated. "First feature" and "second feature" may include one or more of the features.

[0052] In the description of this application, “plurality” means two or more.

[0053] In the description of the present application, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features being in contact with each other not directly but via another feature therebetween.

[0054] In the description of this application, a first feature “on”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0055] In the description of this application, "A and / or B" may include the case of A alone, the case of B alone, or any of the cases of A and B, where A and B are only used for example, and may be any technical feature connected by "and / or" in this application.

[0056] In the description of this application, "same chemical composition" should be understood in a broad sense, that is, the main components of the two have the same chemical composition, or the chemical composition of the two is basically the same, and may have errors within the allowable range in the field that are understandable to those skilled in the art or contain impurities within the allowable range.

[0057] In this application, the writing order of each step does not mean 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 of this application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or steps (b) and (a) performed sequentially. For example, it is mentioned that the method may also include step (c), indicating that step (c) can be added to the method in any order. For example, the method may include steps (a), (b) and (c), or steps (a), (c) and (b), or steps (c), (a) and (b), etc.

[0058] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the present application, any other embodiments that can be conceived by those skilled in the art and that combine some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A vacuum chamber cover processing mold, characterized in that: include: A first module and a second module; The first die set comprises a single-curved concave die portion (4) and a single-curved convex die portion (6), The molding surface of the single-curved concave mold part (4) is a cylindrical groove surface, and the molding 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 die set comprises a double-curved concave die portion (3) and a double-curved convex die portion (5), The molding surface of the hyperbolic concave mold part (3) is a curved cylindrical groove surface, and the curved cylindrical groove surface includes a molding concave surface. In the plane where the edge lines on both sides of the molding concave surface extending along the axial direction are located, the axis line of the molding concave surface is a single curvature arc line; The forming surface of the hyperbolic convex mold part (5) is a curved cylindrical convex ridge surface, and the curved cylindrical convex ridge surface includes a forming convex surface. In the plane where the edge lines on both sides of the forming convex surface extending along the axial direction are located, the axis line of the forming convex 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 arc.

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

3. The vacuum chamber cover processing mold according to claim 1, characterized in that: The double-curved concave mold part (3) of the second mold set is provided with a chamfer on the side of the center of the axis line of the forming concave curved surface.

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

5. The vacuum chamber cover processing mold according to any one of claims 1 to 3, characterized in that: In the first die set, the single-curved concave die portion (4) and the single-curved convex die portion (6) are detachably connected; and / or, In the second die set, the hyperbolic concave die portion (3) and the hyperbolic convex die portion (5) are detachably connected.

6. The vacuum chamber cover processing mold according to claim 5, characterized in that: It also includes a sealing plate (7), wherein a plurality of positioning holes (10) are provided on the sealing plate (7); The single-curved concave mold portion (4) is provided with a first fixing portion, an oblong hole (8) is provided on the first fixing portion, and the first fixing portion is connected to the sealing plate (7) by a bolt passing through the oblong hole (8); A second fixing portion is provided on the hyperbolic concave mold portion (3), an oblong hole (8) is provided on the second fixing portion, and the second fixing portion is connected to the sealing plate (7) via a bolt passing through the oblong hole (8).

7. A method for preparing a vacuum chamber cover, characterized in that: The vacuum chamber shell cover processing mold according to any one of claims 1 to 6 is prepared, comprising: A first blanking plate is press-formed using a first die set to obtain a first shell segment (1); the first blanking plate comprises a straight plate; The second blanking plate is press-formed by using a second die set to obtain a second shell segment (2); the second blanking plate comprises a sector plate.

8. The method according to claim 7, characterized in that The radius of the molding surface of the single-curved concave mold portion (4) of the first mold assembly is 85%-95% of the radius of the first shell segment (1); and / or, The radius of the molding surface of the hyperbolic concave mold portion (3) of the second mold assembly is 105%-115% of the radius of the second shell segment (2).

9. The method according to claim 7, characterized in that Also includes: Assembling the first shell segment (1) and the second shell segment (2) in the first module and the second module respectively, and fixing the first module and the second module on a sealing plate (7) for welding and positioning; After welding and positioning, corresponding welds of the first shell segment (1) and the second shell segment (2) are welded to prepare the vacuum chamber shell cover.

10. The method according to claim 9, 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 temperature of the annealing heat treatment is 300° C.-350° C., and the time of the annealing heat treatment is 3 hours-6 hours.

11. The method according to claim 7, characterized in that Also includes: The connection between the vacuum chamber shell cover and the vacuum chamber shell cover processing mold is sealed and subjected to a temperature increase treatment to perform a sealing test.

12. A vacuum chamber cover, characterized in that: Prepared by the method according to any one of claims 7 to 11, The vacuum chamber shell cover comprises a plurality of first shell segments (1) and at least four second shell segments (2), wherein the first shell segments (1) are straight segments, the second shell segments (2) are arc-shaped with equal radii, the central angles of the second shell segments (2) are all 90 degrees, and the two ends of the second shell segments (2) are respectively connected to different first shell segments (1).

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