Manufacturing method and tooling for nuclear fusion device cold shield

Abstract

The present invention discloses a method and tooling for manufacturing a cold shield for a nuclear fusion device, and relates to the technical field of metal plate processing. The method for manufacturing a cold shield for a nuclear fusion device includes: providing a sub-panel, a flange, and a pipe; welding a plurality of the sub-panels to obtain a first middle piece; welding the edge of the first middle piece and the flange to obtain a second middle piece; welding the pipe on the surface of the second middle piece to obtain a third middle piece; and shaping the third middle piece. The present invention shapes the third middle piece, that is, shapes the third middle piece after all welding processes are completed, thereby making the third middle piece have a smaller contour, thereby making the contour of the cold shield meet the design requirements, reducing the difficulty of assembling the cold shield, and reducing the risk of failure of the cold shield.

Description

Technical Field

[0001] The present invention relates to the technical field of metal plate processing, and in particular to a method and tooling for manufacturing a cold shield of a nuclear fusion device. Background Art

[0002] The cold shield is one of the key components of the controlled nuclear fusion device. It is located in the narrow space between the vacuum chamber and the low-temperature superconducting magnet. Its main function is to reduce the heat load applied to the low-temperature superconducting magnet by the high-temperature components during the normal operation of the nuclear fusion device, ensuring that the low-temperature superconducting magnet can work normally.

[0003] To achieve effective thermal shielding, the cold shield must not come into contact with the vacuum chamber or the low-temperature superconducting magnets. Otherwise, the surge in conductive heat will render the cold shield ineffective. In compact nuclear fusion devices, the gap between the vacuum chamber and the low-temperature superconducting magnets is extremely small, placing stringent requirements on the cold shield's contours.

[0004] In the related art, a cold shield includes a panel, flanges, and pipes. The panel includes multiple sub-panels, and the edges of the multiple sub-panels are partially connected by welding. The edges of the multiple sub-panels are welded with flanges, and then connected by flanges. The pipes are welded to the surface of the panel and are used to pass coolant to cool the panel. The overall structure of the cold shield panel is a large, complex, curved, thin-walled structural component. To ensure the feasibility of manufacturing and installation, the panel is composed of multiple sub-panels connected together. For the welded parts, due to the thin wall thickness of the sub-panels and the large amount of welding, it is very difficult to control the deformation of the sub-panels during the welding process. In addition, the size of the panel is usually relatively large, and it is very difficult to effectively ensure that each component can be accurately connected and maintain a small contour after the welding process is completed. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a method for manufacturing a cold shield for a nuclear fusion device, which can minimize the contour of the cold shield and reduce the risk of cold shield failure.

[0006] According to an embodiment of the present invention, a method for manufacturing a cold shield for a nuclear fusion device includes: providing sub-panels, flanges and pipe fittings; welding a plurality of the sub-panels to obtain a first middle piece; welding the edge and the flanges of the first middle piece to obtain a second middle piece; welding the pipe fitting on the surface of the second middle piece to obtain a third middle piece; and shaping the third middle piece.

[0007] During the process of welding multiple sub-panels, welding the first middle piece and the flange, and welding the second middle piece and the pipe, the sub-panels will inevitably deform, especially when the wall thickness of the sub-panels is thin, the deformation is more obvious and difficult to control. According to the cold shield manufacturing method of the nuclear fusion device according to an embodiment of the present invention, by shaping the third middle piece, that is, shaping the third middle piece after all welding processes are completed, the third middle piece can have a smaller contour, thereby making the contour of the cold shield meet the design requirements, reducing the difficulty of assembling the cold shield, and reducing the risk of failure of the cold shield.

[0008] In some embodiments, the method for manufacturing a cold shield for a nuclear fusion device further includes: shaping the first middle piece before welding the edge and the flange of the first middle piece.

[0009] In some embodiments, the method for manufacturing a cold shield for a nuclear fusion device further includes: shaping the second middle piece before welding the tube to the surface of the second middle piece.

[0010] In some embodiments, shaping the target part includes: detecting the contour of the target part, marking the deformed position of the target part, and squeezing the deformed position until the deformed position undergoes plastic deformation and returns to the designed position; wherein, the target part is the first intermediate part or the second intermediate part or the third intermediate part.

[0011] In some embodiments, welding the plurality of sub-panels to obtain a first middle piece; and welding the edges of the first middle piece and the flange to obtain a second middle piece, comprises:

[0012] Welding the adjacent sub-panels along the first direction to form a first middle piece, or welding the adjacent sub-panels along the first direction to form a middle panel, and cutting the middle panel to form the first middle piece;

[0013] two flanges are arranged between the first intermediate pieces adjacent to each other along a second direction, wherein the first direction intersects the second direction;

[0014] Pre-fixing adjacent flanges, and segmenting the welding portion between the flanges and the first intermediate piece into a plurality of sequentially connected welding segments;

[0015] Repeating the following welding steps until the welding portion between the flange and the first middle piece is completed: welding the flange and a welding section of the first middle piece on one side, and welding the flange and a welding section of the first middle piece on the other side, wherein the two welding sections are opposite to each other;

[0016] The connected flanges are separated to obtain the second middle piece.

[0017] In some embodiments, two adjacent first middle pieces along the second direction are symmetrical and both have opening areas formed thereon, the opening areas of the two first middle pieces are connected to each other, and the flanges between adjacent first middle pieces include a first part and a second part; welding the edges of the first middle pieces and the flanges to obtain the second middle piece also includes: first welding the first part to the first middle piece, and then welding the second part to the edges of the opening areas.

[0018] In some embodiments, pre-fixing the adjacent flanges includes spot welding two adjacent flanges.

[0019] In some embodiments, the plurality of sub-panels include an inner panel and an outer panel, wherein the inner panel is located on a side of the outer panel close to the center of the cold screen;

[0020] The welding of the adjacent sub-panels along the first direction to form a first middle member includes: welding a plurality of adjacent inner panels along a direction from one axial end to the other axial end to form an inner panel group, and welding a plurality of adjacent outer panels along a direction from one axial end to the other axial end to form an outer panel group, wherein both the inner panel group and the outer panel group constitute the first middle member;

[0021] Arranging two flanges between the first intermediate members adjacent in the second direction includes: arranging two flanges between the outer panel groups adjacent in the circumferential direction; or arranging two flanges between the outer panel group and the inner panel group adjacent in the radial direction; or arranging two flanges between the inner panel groups adjacent in the circumferential direction;

[0022] The step of welding the pipe fitting on the surface of the second intermediate piece includes:

[0023] Pre-fixing the adjacent flanges so that the inner panel group and the outer panel group form an annular sector, and welding the pipe fittings on the surfaces of the inner panel group and the outer panel group;

[0024] The connected flanges are separated to obtain the third middle piece.

[0025] In some embodiments, the annular sector includes an inner panel group and two outer panel groups arranged in parallel along the circumferential direction, the inner panel group includes a first butt end and a second butt end spaced apart along the axial direction, the two outer panel groups form a whole including a third butt end and a fourth butt end spaced apart along the axial direction, the first butt end and the third butt end are equal in length and are flush butted together by the flange, and the second butt end and the fourth butt end are equal in length and are flush butted together by the flange.

[0026] The present invention also proposes a cold shield manufacturing tool for a nuclear fusion device.

[0027] According to an embodiment of the present invention, a cold shield manufacturing tool for a nuclear fusion device is used to implement a method for manufacturing a cold shield for a nuclear fusion device according to any of the above embodiments. The cold shield manufacturing tool includes a plurality of sub-tools, and the plurality of sub-tools are configured to be arranged on the inner side of the annular segment and to support the inner wall surface of the annular segment. The plurality of sub-tools are spaced apart and detachably connected by connecting pieces, and the outer wall surfaces of the plurality of sub-tools are distributed along the circumferential direction of the annular segment.

[0028] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0030] Figure 1 This is a flowchart of a method for manufacturing a cold shield for a nuclear fusion device according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic structural diagram of an inner panel group provided on a sub-tooling in an embodiment of the present invention;

[0032] Figure 3 This is a schematic structural diagram of an outer panel group provided on a sub-tool in an embodiment of the present invention;

[0033] Figure 4 This is a schematic structural diagram of an annular sector connected with a flange and provided on a cold screen manufacturing tooling in an embodiment of the present invention;

[0034] Figure 5 This is a schematic structural diagram of an annular sector connected with a pipe fitting and a flange provided on a cold shield manufacturing tool in an embodiment of the present invention;

[0035] Figure 6 This is a schematic structural diagram of a cold screen manufacturing tooling in an embodiment of the present invention;

[0036] Figure 7 Schematic diagram of the structure of the sector unit in an embodiment of the present invention.

[0037] Reference numerals:

[0038] Cold screen manufacturing tooling 200; sub-panel 10;

[0039] Inner panel 101; outer panel 102; inner panel group 103; first docking end 1031;

[0040] Outer panel group 104; third docking end 1041; first middle piece 105; second middle piece 106;

[0041] The third middleware 107;

[0042] Flanged edge 20; opening area 201;

[0043] Pipe fitting 30; annular sector 50; sector unit 60;

[0044] Sub-tool 210; connecting piece 220; support ring 230; connecting beam 240; annular frame 250;

[0045] Assembly tooling 300. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0047] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. The terms used in the present invention and the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The terms "including" and "having" and any variations thereof in the present invention and the claims and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the present invention and the claims and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0048] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0049] The term "and / or" in this disclosure simply describes an association between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this disclosure generally indicates that the related objects are in an "or" relationship.

[0050] In the embodiments of the present invention, identical reference numerals denote identical components, and for the sake of brevity, detailed descriptions of identical components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of the present invention, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings, are merely illustrative and do not constitute any limitation on the present invention.

[0051] The term “plurality” used in the present invention refers to two or more (including two).

[0052] In the related art, a cold shield includes a panel, flanges, and pipes. The panel includes multiple sub-panels, and the edges of the multiple sub-panels are partially connected by welding. The edges of the multiple sub-panels are welded with flanges, and then connected by flanges. The pipes are welded to the surface of the panel and are used to pass coolant to cool the panel. The overall structure of the cold shield panel is a large, complex, curved, thin-walled structural component. To ensure the feasibility of manufacturing and installation, the panel is composed of multiple sub-panels connected together. For the welded parts, due to the thin wall thickness of the sub-panels and the large amount of welding, it is very difficult to control the deformation of the sub-panels during the welding process. In addition, the size of the panel is usually relatively large, and it is very difficult to effectively ensure that each component can be accurately connected and maintain a small contour after the welding process is completed.

[0053] The following combination Figures 1 to 6 The manufacturing method of the cold shield of the nuclear fusion device of the present invention is described.

[0054] like Figures 1 to 6 As shown, the method for manufacturing a cold shield of a nuclear fusion device according to an embodiment of the present invention includes: providing a sub-panel 10, a flange 20 and a pipe 30; welding multiple sub-panels 10 to obtain a first middle piece 105; welding the edge and flange 20 of the first middle piece 105 to obtain a second middle piece 106; after welding the pipe 30 on the surface of the second middle piece 106, a third middle piece 107 is obtained; and shaping the third middle piece 107.

[0055] Specifically, the sub-panel 10 can be obtained through a profiling process so that the sub-panel 10 has the required degree of curvature. Before welding multiple sub-panels 10, the edges of the sub-panels 10 need to be processed so that the flatness of the edges of the sub-panels 10 meets the welding requirements, thereby obtaining a better welding effect and reducing welding defects.

[0056] The flange 20 can be formed through a forging process to provide the flange 20 with a high structural strength. Before welding the flange 20 to the first intermediate member 105, the flange 20 is bent so that the curvature of the flange 20 matches the curvature of the edge of the sub-panel 10. Furthermore, the wall surface of the flange 20 is machined so that the flatness of the wall surface where the flange 20 is welded to the sub-panel 10 meets the welding requirements, thereby achieving a better welding effect and reducing welding defects.

[0057] The pipe fitting 30 can be bent in a plane by a pipe bender so that the degree of bending of the pipe fitting 30 perpendicular to its own extension axis can match the degree of bending of the sub-panel 10 , and the pipe fitting 30 can better fit the surface of the sub-panel 10 .

[0058] Directly welding multiple sub-panels 10 facilitates the continuous arrangement of pipes 30 and reduces the difficulty of arranging pipes 30. Multiple sub-panels 10 are connected by flanges 20. In this way, the flanges 20 can act as reinforcement ribs, so that the overall cold screen has a higher structural strength.

[0059] Shaping the third middle piece 107 includes: detecting the contour of the third middle piece 107, marking the deformation position of the third middle piece 107, and squeezing the deformation position until the deformation position undergoes plastic deformation and returns to the design position, thereby making the third middle piece 107 have a smaller contour and meet the design requirements.

[0060] In other embodiments, shaping the third middle piece 107 may include placing the third middle piece 107 in a shaping mold whose contour meets the design requirements, and applying extrusion pressure to the entire third middle piece 107 so that the deformed position of the third middle piece 107 undergoes plastic deformation and returns to the designed position.

[0061] The method for manufacturing a cold shield for a nuclear fusion device also includes, after shaping the third intermediate piece 107, assembling multiple third intermediate pieces 107 to form the cold shield. It should be noted that if the third intermediate pieces 107 have a large profile, there is a high probability that the installation positions of adjacent third intermediate pieces 107 will not match when assembling them. This greatly increases the difficulty of assembly. Furthermore, forced assembly can result in significant mechanical stress at the assembly locations, making them susceptible to damage after long-term use.

[0062] During the process of welding multiple sub-panels 10, the process of welding the first middle piece 105 and the flange 20, and the process of welding the second middle piece 106 and the pipe 30, the sub-panels 10 will inevitably deform, especially when the wall thickness of the sub-panel 10 is thin, the deformation is more obvious and difficult to control. According to the cold shield manufacturing method of the nuclear fusion device according to an embodiment of the present invention, by shaping the third middle piece 107, that is, shaping the third middle piece 107 after all welding processes are completed, the third middle piece 107 can have a smaller contour, thereby making the contour of the cold shield meet the design requirements, reducing the difficulty of assembling the cold shield, and reducing the risk of failure of the cold shield.

[0063] In some embodiments, the method for manufacturing a cold shield for a nuclear fusion device further includes: shaping the first middle piece 105 before welding the edge and flange 20 of the first middle piece 105 .

[0064] It can be understood that the first middle piece 105 is obtained by welding together a plurality of sub-panels 10 arranged according to a set plane. During the welding process, the sub-panels 10 will inevitably be deformed due to uneven welding heat input, and the curvature of the flange 20 before welding matches the designed curvature of the first middle piece 105. Therefore, by shaping the first middle piece 105 before welding the edge and flange 20 of the first middle piece 105, the contour of the first middle piece 105 can be made as small as possible, that is, the actual curvature of the first middle piece 105 and the designed curvature of the first middle piece 105 are made as consistent as possible, so that the curvature of the first middle piece 105 can match the curvature of the flange 20, reducing the connection surface deviation between the flange 20 and the first middle piece 105, thereby reducing the stress at the connection position between the flange 20 and the first middle piece 105 after welding.

[0065] Specifically, shaping the first middle piece 105 may include: detecting the contour of the first middle piece 105, marking the deformation position of the first middle piece 105, and squeezing the deformation position until the deformation position undergoes plastic deformation and returns to the design position, thereby making the first middle piece 105 have a smaller contour.

[0066] In other embodiments, shaping the first middle piece 105 may include placing the first middle piece 105 in a shaping mold whose contour meets the design requirements, and applying an extrusion force to the entire first middle piece 105 so that the deformed position of the first middle piece 105 undergoes plastic deformation and returns to the designed position.

[0067] In some embodiments, the method for manufacturing a cold shield for a nuclear fusion device further includes: shaping the second middle piece 106 before welding the pipe 30 to the surface of the second middle piece 106 .

[0068] It should be noted that during the welding process of the flange 20 and the first middle piece 105, the flange 20 and the first middle piece 105 will be deformed due to uneven welding heat input, and the pipe fitting 30 matches the designed bending degree of the second middle piece 106 before welding. Therefore, by shaping the second middle piece 106 before welding the pipe fitting 30 on the surface of the second middle piece 106, the contour of the second middle piece 106 can be made as small as possible, that is, the actual bending degree of the second middle piece 106 and the designed bending degree of the second middle piece 106 are made as consistent as possible, so that the bending degree of the second middle piece 106 can match the bending degree of the pipe fitting 30, reducing the connection surface deviation between the pipe fitting 30 and the second middle piece 106, thereby reducing the stress at the connection position between the pipe fitting 30 and the second middle piece 106.

[0069] Specifically, shaping the second middle piece 106 includes: detecting the contour of the second middle piece 106, marking the deformation position of the second middle piece 106, and squeezing the deformation position until the deformation position undergoes plastic deformation and returns to the design position, thereby making the second middle piece 106 have a smaller contour.

[0070] In other embodiments, shaping the second middle piece 106 may include placing the second middle piece 106 in a shaping mold whose contour meets the design requirements, and applying extrusion force to the entire second middle piece 106 so that the deformed position of the second middle piece 106 undergoes plastic deformation and returns to the designed position.

[0071] In some embodiments, the target part is shaped, including: detecting the contour of the target part, marking the deformed position of the target part, and squeezing the deformed position until the deformed position undergoes plastic deformation and returns to the designed position; wherein the target part is the first intermediate part 105 or the second intermediate part 106 or the third intermediate part 107.

[0072] To detect the contour of the target part, specifically, the detection surface of the pallet can be fitted with the target part, and the curvature of the detection surface of the pallet is consistent with the designed curvature of the target part. Therefore, by fitting the detection surface of the pallet with the target part, there will be a gap between the detection surface of the pallet and the target part at the deformed position of the target part, so that the deformed position of the target part can be detected.

[0073] The deformed position is squeezed until the deformed position undergoes plastic deformation and returns to the designed position. Specifically, a shaping tool can be used to shape the deformed position. The shaping tool can include a main body, a plurality of fixing parts arranged on the main body, and an extrusion part arranged on the main body. When the deformed position is shaped, the fixing parts and the extrusion part are arranged on both sides of the thickness direction of the target part, for example, on both sides of the thickness direction of the sub-panel 10. The deformed position is formed with a convex surface and a concave surface. The extrusion part fits with the convex surface to extrude the convex surface so that the deformed position undergoes plastic deformation. For example, the extrusion part can be a hydraulic jack.

[0074] The deformed position undergoes plastic deformation and returns to the designed position, that is, the curvature of the deformed position is restored to the designed curvature. The deformed position undergoes plastic deformation, that is, after the shaping is completed, the contour of the deformed position can be maintained at the required contour without rebound. The shaping process of the embodiment of the present application only squeezes the deformed position, which is easy to operate and does not require the use of large shaping equipment, which is conducive to reducing shaping costs.

[0075] In some embodiments, the manufacturing method of the cold shield of a nuclear fusion device also includes performing vibration aging treatment on the welds between multiple sub-panels 10, performing vibration aging treatment on the welds between the flange 20 and the first middle piece 105, and performing vibration aging treatment on the welds between the second middle piece 106 and the pipe 30, so as to eliminate stress at the welds and reduce the risk of cracking in the later stage of the welds.

[0076] In some embodiments, welding a plurality of sub-panels 10 to obtain a first intermediate member 105; welding the edges and flanges 20 of the first intermediate member 105 to obtain a second intermediate member 106, including:

[0077] The first intermediate member 105 is formed by welding adjacent sub-panels 10 along the first direction; in other words, for a plurality of sub-panels 10 arranged along the first direction, adjacent sub-panels 10 are welded together, and the sizes and curvatures of different sub-panels 10 may be the same or different.

[0078] Two flanges 20 are arranged between the first middle pieces 105 adjacent to each other along the second direction. It can be understood that, for the two flanges 20, one flange 20 is used to connect to the first middle piece 105 on one side, and the other flange 20 is used to connect to the first middle piece 105 on the other side.

[0079] The first direction and the second direction intersect; wherein the first direction and the second direction can be determined according to the actual partition design of the panel (each partition corresponds to a sub-panel 10). For example, you can refer to Figure 4 and Figure 5The first direction can be the direction from one axial end to the other axial end of the cold shield, and the second direction can be the circumferential direction of the cold shield. The axial direction here refers to the extension direction of the central axis of the cold shield, and the circumferential direction refers to the direction around the entire cold shield.

[0080] The adjacent flanges 20 are pre-fixed, that is, the two flanges 20 are pre-fixed between the two first intermediate pieces 105 .

[0081] Pre-fixing adjacent flanges 20 may include spot welding adjacent flanges 20, that is, pre-fixing two adjacent flanges 20 by multiple spot welding points to facilitate subsequent separation of the two flanges 20 to reshape the second intermediate piece 106. Alternatively, pre-fixing adjacent flanges 20 may also include clamping and fixing the adjacent flanges 20 using a clamping device, which can be removed from the flanges 20 to facilitate subsequent separation of the flanges 20.

[0082] The weld between the flange 20 and the first intermediate member 105 is segmented into multiple, sequentially connected weld segments. The following welding steps are repeated until the weld between the flange 20 and the first intermediate member 105 is complete: welding one weld segment between the flange 20 and the first intermediate member 105 on one side, and welding one weld segment between the flange 20 and the first intermediate member 105 on the other side, with the two weld segments facing each other. The connected flanges 20 are then separated to obtain the second intermediate member 106, which is then reshaped.

[0083] In this embodiment, before welding the flange 20 and the first middle piece 105, the two flanges 20 are pre-fixed. In this way, for example, after the welding of the welding section of the flange 20 and the first middle piece 105 on one side is completed, when welding the welding section of the flange 20 and the first middle piece 105 on the other side, or when welding the remaining welding sections, the welded part will have the effect of restricting the deformation of the unwelded part, which is beneficial to reduce the deformation of the second middle piece 106 caused by welding, and thus reduce the difficulty and time of shaping.

[0084] Furthermore, the first direction is the direction from one axial end to the other axial end, and the second direction is the circumferential direction of the cold shield, or the second direction may be the circumferential direction of the annular sector 50 .

[0085] When welding the welding part between the flange 20 and the first middle piece 105, the welding sections at the axial ends of the flange 20 can be welded first, and then the welding section at the middle of the flange 20 can be welded. The welded part will have the effect of restricting the deformation of the unwelded part, which is beneficial to reduce the degree of welding deformation of the entire second middle piece 106.

[0086] In some embodiments, two adjacent first middle pieces 105 along the second direction are symmetrical and each has an opening area 201 formed therein. The opening areas 201 of the two first middle pieces 105 are interconnected, and the flange 20 between adjacent first middle pieces 105 includes a first portion and a second portion. Welding the edges of the first middle pieces 105 to the flange 20 to form the second middle piece 106 further includes: first welding the first portion to the first middle piece 105, and then welding the second portion to the edge of the opening area 201. The second direction herein may refer to the circumferential direction of the cold shield.

[0087] That is, each flange 20 includes a first portion and a second portion, the second portion is used to connect with the edge of the opening area 201 , and the third portion is used to connect with the remaining edges of the first middle piece 105 .

[0088] During welding, the portion of the first middle piece 105 where the opening area 201 is not formed and the first portion are welded first, and then the second portion and the edge of the opening area 201 are welded. The portion of the first middle piece 105 where the opening area 201 is not formed can have the effect of restricting deformation, thereby helping to reduce the degree of welding deformation of the entire second middle piece 106.

[0089] The edge of the first middle piece 105 with the opening area 201 is more prone to deformation during welding. Therefore, the present application pre-fixes the flanges 20 arranged side by side together so that the adjacent first middle pieces 105 can restrain each other from deformation during the welding process, thereby reducing the degree of deformation of the second middle piece 106.

[0090] In some embodiments, the first intermediate pieces 105 adjacent to each other along the second direction may be completely fitted and docked, that is, no opening area 201 is formed.

[0091] In some embodiments, pre-fixing adjacent flanges 20 includes spot welding adjacent flanges 20. Pre-fixing adjacent flanges 20 by spot welding is simple and convenient to operate and has low implementation cost.

[0092] In some embodiments, the plurality of sub-panels 10 include an inner panel 101 and an outer panel 102, wherein the inner panel 101 is located on a side of the outer panel 102 close to the center of the cold shield. In other words, the inner panel 101 is located on a side of the outer panel 102 close to the central axis of the cold shield.

[0093] The first middle piece 105 is formed by welding the adjacent sub-panels 10 along the first direction, including: welding a plurality of adjacent inner panels 101 along the direction from one axial end to the other axial end to form an inner panel group 103, and welding a plurality of adjacent outer panels 102 along the direction from one axial end to the other axial end to form an outer panel group 104, and both the inner panel group 103 and the outer panel group 104 are the first middle piece 105.

[0094] Two flanges 20 are arranged between the first middle pieces 105 adjacent along the second direction, including: two flanges 20 are arranged between the outer panel groups 104 adjacent along the circumferential direction; or, two flanges 20 are arranged between the outer panel group 104 and the inner panel group 103 adjacent along the radial direction; or, two flanges 20 are arranged between the inner panel groups 103 adjacent along the circumferential direction.

[0095] Welding the pipe 30 on the surface of the second intermediate piece 106 includes:

[0096] Adjacent flanges 20 are pre-fixed to form an annular segment 50 between the inner panel group 103 and the outer panel group 104, and the pipe fitting 30 is welded to the surfaces of the inner panel group 103 and the outer panel group 104. That is, before welding the pipe fitting 30, a portion of the inner panel group 103 and a portion of the outer panel group 104 are connected to form the annular segment 50 via the flanges 20, and the pipe fitting 30 is welded to the annular segment 50. Because the various parts of the annular segment 50 can restrain each other and are less likely to deform, welding the pipe fitting 30 to the annular segment 50 can reduce deformation caused by welding the pipe fitting 30 to the second intermediate member 106, thereby reducing the time and difficulty of reshaping the second intermediate member 106.

[0097] The connected flanges 20 are separated to obtain the third middle piece 107 , so as to facilitate subsequent shaping of the third middle piece 107 .

[0098] It should be noted that the cardboard used to detect the bending degree of multiple outer panel groups 104 can be the same cardboard, and the cardboard used to detect the bending degree of multiple inner panel groups 103 can be the same cardboard, which can reduce the complexity of the detection operation.

[0099] In some embodiments, welding a plurality of inner panels 101 to form an inner panel group 103 may specifically include the following steps: fixing the plurality of inner panels 101 to the 22.5° inner sector panel tooling according to the assembly position, and welding the plurality of inner panels 101 to obtain the inner panel group 103. The 22.5° inner sector panel tooling is provided with grooves at positions corresponding to the welding positions for passing argon gas during the welding process. Along the circumference of the cold screen, a total of 16 identical inner panel groups 103 are provided, and the 22.5° inner sector panel tooling is adapted to the inner panel group 103. After the inner panel group 103 is shaped, the inner panel group 103 can fully fit with the 22.5° inner sector panel tooling in a natural state.

[0100] In some embodiments, welding multiple outer panels 102 to form an outer panel group 104 can specifically include the following steps: installing and fixing multiple outer panels 102 to the 22.5° outer sector panel tooling according to the assembly position, welding multiple outer panels 102 to obtain an intermediate panel, and then cutting the intermediate panel to obtain two outer panel groups 104. The 22.5° outer sector panel tooling is provided with grooves at positions corresponding to the welding positions for passing argon gas during the welding process. A total of 32 identical outer panel groups 104 are provided along the circumference of the cold shield. After the outer panel group 104 is shaped, the outer panel group 104 can fully fit with the 22.5° outer sector panel tooling in a natural state.

[0101] In some embodiments, reference may be made to Figure 4 and Figure 5 The annular segment 50 includes an inner panel group 103 and two outer panel groups 104 arranged in parallel along the circumferential direction. The inner panel group 103 includes a first butt joint end 1031 and a second butt joint end spaced apart in the axial direction. The two outer panel groups 104 form a whole including a third butt joint end 1041 and a fourth butt joint end spaced apart in the axial direction. The first butt joint end 1031 and the third butt joint end 1041 are of equal length and are flush butted together by the flange 20. The second butt joint end and the fourth butt joint end are of equal length and are flush butted together by the flange 20. This annular segment 50 has a better overall structural stability and is less likely to deform when welding the pipe 30.

[0102] In some embodiments, for one annular segment 50, both outer panel groups 104 are formed with opening areas 201, and the two opening areas 201 are symmetrical and directly connected. Such annular segment 50 has better overall structural stability and is less likely to deform when welding the pipe 30.

[0103] In some embodiments, after shaping the third middle piece 107 , the steps further include: processing the flange 20 and punching holes in the flange 20 , connecting the flange 20 with fasteners to form an annular sector 50 , and inspecting the annular sector 50 .

[0104] After the third middle piece 107 is processed, holes are punched on the flange 20. This can avoid the problem of premature punching of the flange 20 and mismatching of the connecting holes between adjacent flanges 20 when connecting the flanges 20, thereby reducing the difficulty of assembling the flange 20.

[0105] Specifically, welding the pipe 30 on the surface of the second middle piece 106 includes: passing a cooling medium through the back surface of the second middle piece 106 to perform intermittent and staggered fillet welding of the pipe 30 and the second middle piece 106 .

[0106] Specifically, processing the flange 20 includes fixing the third middle piece 107 into the annular sector 50 again after the third middle piece 107 is shaped, and then processing the outer contour of the flange 20 and punching the flange 20 on the cold shield manufacturing tool 200.

[0107] After the flange 20 is processed, the third middle piece 107 is again connected to the flange 20 with bolts to fix it into an annular segment 50, and then the annular segment 50 is subjected to air pressure test, hot and cold shock cycle test, helium leak test and relevant weld quality inspection after the test.

[0108] In some embodiments, after shaping the third middle piece 107, the process further includes mirror polishing the third middle piece 107. After the third middle piece 107 is mirror polished to a surface roughness that meets the design requirements, a protective film may be applied to the inner and outer surfaces of the third middle piece 107 for protection.

[0109] The third middle piece 107 is mirror-polished to have a high surface finish, that is, the inner and outer surfaces of the cold shield have a high surface finish, so that the cold shield can reflect heat and reduce heat transfer along the cold shield.

[0110] In some embodiments, the thickness of the flange 20 is greater than that of the sub-panel 10. On the one hand, the flange 20 can connect adjacent sub-panels 10, allowing bolts to connect adjacent flanges 20, resulting in a more stable connection. On the other hand, the flange 20 can act like a rib, reinforcing the panel. Furthermore, additional ribs can be provided on the panel, intersecting the flange 20.

[0111] The thickness of the flange 20 is greater than the thickness of the sub-panel 10, so that the overall structural strength of the panel can be higher, and the thickness at the sub-panel 10 will not be too thick, so as to facilitate the arrangement of the pipe 30 at the sub-panel 10 to control the overall thickness of the cold shield from being too thick to adapt to the narrow space between the vacuum chamber and the low-temperature superconducting magnet.

[0112] The present invention also provides a nuclear fusion device cold shield manufacturing tool 200.

[0113] The nuclear fusion device cold shield manufacturing tool 200 according to an embodiment of the present invention is used to implement the nuclear fusion device cold shield manufacturing method according to any of the above embodiments.

[0114] The cold screen manufacturing tooling 200 includes multiple sub-toolings 210, which are configured to be arranged on the inner side of the annular sector 50 and used to support the inner wall surface of the annular sector 50. The multiple sub-toolings 210 are spaced apart and detachably connected through connecting pieces 220. The outer wall surfaces of the multiple sub-toolings 210 are distributed along the circumferential direction of the annular sector 50.

[0115] For example, you can refer to Figures 2 to 6 The cold shield manufacturing tool 200 may include two sub-tools 210, one of which is used to support one inner panel group 103, and the other sub-tool 210 is used to support two outer panel groups 104. Adjacent sub-tools 210 are bolted to connectors 220. Furthermore, a sub-tool 210 may also be used independently, for example, to process an inner panel group 103 or an outer panel group 104.

[0116] For example, one sub-tool 210 may be a 22.5° inner sector panel tool, and the other sub-tool 210 may be a 22.5° outer sector panel tool.

[0117] According to an embodiment of the present invention, the cold shield manufacturing tool 200 of the nuclear fusion device is connected by multiple detachable sub-tools 210, and adjacent sub-tools 210 have gaps. The multiple sub-tools 210 are respectively used to support different inner wall surfaces of the annular segment 50 distributed along its own circumferential direction. In this way, when the cold shield manufacturing tool 200 needs to be removed from the annular segment 50, the connecting piece 220 can be removed to separate the adjacent sub-tools 210 from each other. Since there is a gap between adjacent sub-tools 210, the sub-tools 210 and the annular segment 50 can be easily separated, so that the cold shield manufacturing tool 200 can be easily removed from the annular segment 50.

[0118] In some embodiments, reference may be made to Figure 6 The sub-assembly 210 has a frame structure. Specifically, the sub-assembly 210 includes multiple support rings 230 spaced apart along the circumference of the cold shield. The multiple support rings 230 are interconnected by connecting beams 240. The portion of the sub-assembly 210 corresponding to the opening area 201 is also equipped with an annular frame 250 to support the edge of the opening area 201. The provision of the annular frame 250 can reduce the degree of deformation of the edge of the opening area 201 and the flange 20 at the edge of the opening area 201.

[0119] A specific embodiment is given below to illustrate the method for manufacturing a nuclear fusion device cold shield and the tool 200 for manufacturing a nuclear fusion device cold shield of the present invention. However, this specific embodiment does not constitute a limitation of the present invention.

[0120] You can refer to Figure 2 , multiple inner panels 101 are spliced ​​and fixed on the 22.5° inner sector panel tooling in sequence, and then multiple inner panels 101 are welded to form an inner panel group 103. After welding is completed, the inner panel group 103 is removed from the 22.5° inner sector panel tooling for shaping.

[0121] You can refer to Figure 3, multiple outer panels 102 are spliced ​​and fixed on the 22.5° outer sector panel tooling in sequence, and then the multiple outer panels 102 are welded to form an intermediate panel. After welding is completed, the intermediate panel is removed from the 22.5° outer sector panel tooling for shaping; the intermediate panel is fixed on the 22.5° outer sector panel tooling, and then the intermediate panel is cut so that the intermediate panel becomes two 11.25° outer panel groups 104, and the two outer panel groups 104 both have an opening area 201, and the opening areas 201 of the two outer panel groups 104 are symmetrical and directly connected.

[0122] The 22.5° inner sector panel fixture and the 22.5° outer sector panel fixture are secured together via connectors 220, and the inner panel assembly 103 is secured to the 22.5° inner sector panel fixture. The inner panel assembly 103 includes a first butt joint end 1031 and a second butt joint end spaced axially apart. The two outer panel assemblies 104 form a unit comprising a third butt joint end 1041 and a fourth butt joint end spaced axially apart. The first butt joint end 1031 and the third butt joint end 1041 are of equal length and face each other flushly, while the second butt joint end and the fourth butt joint end are of equal length and face each other flushly.

[0123] You can refer to Figure 4 , arranging flanges 20 between adjacent outer panel groups 104, arranging flanges 20 between the outer panel group 104 and the inner panel group 103, arranging flanges 20 along the edges of the opening area 201, arranging flanges 20 along the edges of the outer panel group 104, welding the outer panel groups 104 and the flanges 20, and welding the inner panel group 103 and the flanges 20. The specific welding steps are as follows: pre-fixing adjacent flanges 20 side by side, segmenting the welding portion between the flanges 20 and the outer panel group 104 into multiple sequentially connected welding segments;

[0124] The following welding steps are repeated until the welding portion between the flange 20 and the outer panel group 104 is welded: welding a welding section between the flange 20 and the outer panel group 104 on one side, and welding a welding section between the flange 20 and the outer panel group 104 on the other side, wherein the two welding sections are opposite to each other;

[0125] Separate the connected flanges 20 to obtain an inner panel group 103 with a flange 20 and two outer panel groups 104 with flanges 20; remove the inner panel group 103 with the flange 20 from the 22.5° inner sector panel tooling and reshape it; remove the outer panel group 104 with the flange 20 from the 22.5° outer sector panel tooling and reshape it.

[0126] Then, an inner panel group 103 with a flange 20 and two outer panel groups 104 with flanges 20 are fixed to the nuclear fusion device cold shield manufacturing tooling 200, and the lengths of the first docking end 1031 and the third docking end 1041 are equal and are flush docked through the flange 20, and the lengths of the second docking end and the fourth docking end are equal and are flush docked through the flange 20.

[0127] You can refer to Figure 5 , pre-fix adjacent flanges 20 so that the inner panel group 103 and the outer panel group 104 form an annular sector 50, and weld the pipe fitting 30 on the surface of the inner panel group 103 and the surface of the outer panel group 104; separate the connected flanges 20 to obtain the third intermediate piece 107.

[0128] When assembling the third intermediate member 107 into a cold shield, first fix the two inner panel groups 103 with flanges 20 and pipes 30 and the four outer panel groups 104 with flanges 20 and pipes 30 on the assembly tool 300 to form the following structure: Figure 7 The sector unit 60 shown is then assembled into a plurality of sector units 60 to form a cold shield.

[0129] It should be noted that all welding processes in the cold shield manufacturing method of the nuclear fusion device in the embodiment of the present application can be protected by argon gas. For example, a groove can be opened on the cold shield manufacturing tool 200, and the groove corresponds to the back side of the position where the weld is to be formed, so as to facilitate the flow of argon gas during the welding process to improve the welding quality.

[0130] Throughout this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" indicate that the specific features, structures, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0131] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A method for manufacturing a cold shield for a nuclear fusion device, characterized in that: include: Providing a sub-panel (10), a flange (20) and a pipe (30); Welding a plurality of the sub-panels (10) to obtain a first intermediate piece (105); Welding the edge of the first middle piece (105) and the flange (20) to obtain a second middle piece (106); After the pipe (30) is welded to the surface of the second middle piece (106), a third middle piece (107) is obtained; Reshaping the third middle piece (107); The step of welding a plurality of sub-panels (10) to obtain a first middle piece (105); and welding the edge of the first middle piece (105) and the flange (20) to obtain a second middle piece (106) comprises: Welding the adjacent sub-panels (10) along the first direction to form a first middle piece (105), or welding the adjacent sub-panels (10) along the first direction to form a middle panel, and cutting the middle panel to form the first middle piece (105); two flanges (20) are arranged between the first intermediate members (105) adjacent to each other along a second direction, wherein the first direction and the second direction intersect; Pre-fixing adjacent flanges (20), and segmenting the welding portion between the flanges (20) and the first middle piece (105) to form a plurality of sequentially connected welding segments; The following welding steps are repeated until the welding portion between the flange (20) and the first middle piece (105) is welded: welding a welding section between the flange (20) and the first middle piece (105) on one side, and welding a welding section between the flange (20) and the first middle piece (105) on the other side, wherein the two welding sections are opposite to each other; The connected flanges (20) are separated to obtain the second intermediate piece (106).

2. The method for manufacturing a cold shield for a nuclear fusion device according to claim 1, characterized in that: Also includes: Before welding the edge of the first middle piece (105) and the flange (20), the first middle piece (105) is shaped.

3. The method for manufacturing a cold shield for a nuclear fusion device according to claim 1, characterized in that: Also includes: Before welding the pipe (30) to the surface of the second middle piece (106), the second middle piece (106) is shaped.

4. The method for manufacturing a cold shield for a nuclear fusion device according to claim 1, characterized in that: Shaping a target part includes: detecting the contour of the target part, marking the deformed position of the target part, and squeezing the deformed position until the deformed position undergoes plastic deformation and returns to the designed position; wherein the target part is the first intermediate part (105) or the second intermediate part (106) or the third intermediate part (107).

5. The method for manufacturing a cold shield for a nuclear fusion device according to claim 1, characterized in that: Two first middle pieces (105) adjacent to each other in the second direction are symmetrical and both have an opening area (201), the opening areas (201) of the two first middle pieces (105) are connected to each other, and the flange (20) between adjacent first middle pieces (105) includes a first part and a second part; the welding of the edge of the first middle piece (105) and the flange (20) to obtain the second middle piece (106) further includes: first welding the first part to the first middle piece (105), and then welding the second part to the edge of the opening area (201).

6. The method for manufacturing a cold shield for a nuclear fusion device according to claim 1, characterized in that: The pre-fixing of the adjacent flanges (20) comprises: spot welding two adjacent flanges (20).

7. The method for manufacturing a cold shield for a nuclear fusion device according to claim 1, characterized in that: The plurality of sub-panels (10) include an inner panel (101) and an outer panel (102), wherein the inner panel (101) is located on a side of the outer panel (102) close to the center of the cold screen; The welding of the adjacent sub-panels (10) along the first direction to form a first middle piece (105) comprises: welding a plurality of adjacent inner panels (101) along the direction from one axial end to the other axial end to form an inner panel group (103), and welding a plurality of adjacent outer panels (102) along the direction from one axial end to the other axial end to form an outer panel group (104), wherein both the inner panel group (103) and the outer panel group (104) are the first middle piece (105); Arranging two flanges (20) between the first intermediate members (105) adjacent in the second direction includes: arranging two flanges (20) between the outer panel groups (104) adjacent in the circumferential direction; or arranging two flanges (20) between the outer panel group (104) and the inner panel group (103) adjacent in the radial direction; or arranging two flanges (20) between the inner panel group (103) adjacent in the circumferential direction; The step of welding the pipe (30) on the surface of the second intermediate piece (106) comprises: Pre-fixing the adjacent flanges (20) so that the inner panel group (103) and the outer panel group (104) form an annular sector (50), and welding the pipe (30) to the surface of the inner panel group (103) and the surface of the outer panel group (104); The connected flanges (20) are separated to obtain the third intermediate piece (107).

8. The method for manufacturing a cold shield for a nuclear fusion device according to claim 7, characterized in that: The annular sector (50) includes an inner panel group (103) and two outer panel groups (104) arranged in parallel along the circumferential direction, the inner panel group (103) includes a first butt end (1031) and a second butt end spaced apart along the axial direction, the two outer panel groups (104) form a whole including a third butt end (1041) and a fourth butt end spaced apart along the axial direction, the first butt end (1031) and the third butt end (1041) are of equal length and are butt-jointed flushly by the flange (20), and the second butt end and the fourth butt end are of equal length and are butt-jointed flushly by the flange (20).

9. A nuclear fusion device cold shield manufacturing tool, characterized in that: Used to implement the method for manufacturing a cold shield for a nuclear fusion device according to any one of claims 1 to 8, the cold shield manufacturing tooling (200) includes a plurality of sub-toolings (210), the plurality of sub-toolings (210) being configured to be arranged on the inner side of an annular segment (50) and used to support the inner wall surface of the annular segment (50), the plurality of sub-toolings (210) being spaced apart and detachably connected via a connector (220), and the outer wall surfaces of the plurality of sub-toolings (210) being distributed along the circumferential direction of the annular segment (50).

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