A large multi-section combined curved surface cylinder processing method

Abstract

The present application relates to a kind of large multi-section combined curved surface cylinder processing method, the combined curved surface cylinder is combined after being independently processed by multiple single-section cylinder, when single-section cylinder is processed, the radial positioning of upper end of cylinder is realized by the cooperation of process connecting block and special height fixing device of vertical lathe, the rigidity of turning process cylinder is improved, external constraint is converted to internal constraint support by self-adapting support structure, the deformation of cylinder during reversing is reduced, while combining indirect measurement method and numerical control processing, the size precision of the curved surface boundary point of single-section cylinder is guaranteed, the present application solves the machining precision control problem of large curved surface cylinder by the above method, and improves the curved surface precision after overall assembly.

Description

Technical Field

[0001] This invention relates to the field of machining large curved cylindrical bodies, and specifically to a method for machining large multi-segment combined curved cylindrical bodies. Background Technology

[0002] Due to limitations in processing equipment, large curved cylindrical bodies cannot be machined as a single unit. Therefore, they are typically constructed using a multi-segment assembly structure. This involves dividing the large curved cylindrical body into multiple segments, machining each segment individually, and then connecting the segments using convex and concave stop joints and bolts. Figure 1 As shown.

[0003] The structural characteristics of each section of the cylinder are large diameter, thin wall thickness, high surface precision requirements, and a smooth transition at the joints, with no step differences allowed. The wall thickness of a single section is generally 20mm, with a maximum diameter of 6 meters and a height of 3 meters. Figure 2 As shown, the overall structure of the cylinder has poor rigidity, and the machining accuracy of the inner curved surface is high. The machining process is prone to many adverse factors such as cylinder deformation and vibration, which affect the machining accuracy of the inner curved surface. In addition, the control of the dimensional accuracy of the cylinder docking boundary is also a machining problem. The machining accuracy of a single cylinder segment directly affects the surface accuracy after overall assembly. How to effectively control the machining accuracy of the curved surface cylinder to obtain a high-precision large multi-segment combined curved surface cylinder is a problem that needs to be solved. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for processing large, multi-segment combined curved surface cylinders. By setting up process supports, the rigidity of the cylinder is improved, the deformation of the cylinder is reduced, and the processing accuracy is increased. Furthermore, this invention also provides an indirect measurement method that facilitates control of accuracy, enabling precise control of the curved surface boundary dimensions, which is beneficial for improving the accuracy of the assembled curved surface.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for machining a large, multi-segment composite curved surface cylinder, wherein the composite curved surface cylinder is composed of multiple individually machined and then assembled. During the machining of a single segment, the single segment is first clamped and positioned. Multiple process connecting blocks of uniform height are evenly welded along the circumferential direction on the outer wall of the upper end of the single segment. The lower end of the single segment is fixed at multiple points using machine tool chucks. The upper end of the single segment is fixed by connecting the process connecting blocks to a vertical lathe-specific heightening and fixing device, thus fixing the single segment at multiple points at the upper end. After the upper and lower clamping and positioning are completed, the inner curved surface of the single segment, one end flange, and the stop are precision machined. Then, maintaining the multi-point clamping state, an adaptive support structure is installed inside the single segment to support and constrain it from the inside. Afterward, the upper and lower clamps are released, the workpiece is rotated 180°, fixed using machine tool chucks, and the other end flange and the stop of the single segment are precision machined, completing the machining of the single segment.

[0006] Furthermore, the single-section cylinder is machined using a large CNC vertical lathe. The vertical lathe's dedicated heightening and fixing device includes a height support and a fixing device. The upper surface of the fixing device has a fixing groove corresponding to the process connecting block. The lower end of the single-section cylinder is fixed using machine tool chucks. The rotation center of the single-section cylinder is aligned with the rotation center of the machine tool by adjusting the chucks. A height support corresponding to the process connecting block is set on the machine tool worktable. The fixing device is installed on the height support. The installation height ensures that the process connecting block is aligned with the fixing groove. The vertical height of the fixing device is finely adjusted so that the bottom surface of the process connecting block is in contact with the bottom surface of the fixing groove. Then, the process connecting block and the fixing device are fixed in the vertical and horizontal directions respectively.

[0007] Furthermore, the bottom surfaces of the process connecting block and the fixing groove are respectively provided with fixing holes. In the vertical direction, the process connecting block and the fixing device are fixed by passing the center bolt through the fixing holes. In the horizontal direction, threaded holes are opened on each side of the fixing groove. The threaded holes correspond to the circumferential and radial directions of the single-section cylinder, respectively. The side adjusting screws are screwed into the threaded holes and tightened against each side of the process connecting block to achieve horizontal fixation of the process connecting block.

[0008] Furthermore, four process connection blocks are evenly welded along the circumference of the upper part of the single-section cylinder, and the lower part of the single-end cylinder is positioned at four points using machine tool chucks.

[0009] Furthermore, after the inner curved surface of the single-section cylinder and the flange and stop at one end are precision machined, they are kept in a multi-point mounting state at the top and bottom. Two or more sets of adaptive support structures are installed inside the single-section cylinder. The adaptive support structure includes radial support frames and wedges. At least two rows of radial support frames are set in the vertical direction inside the single-section cylinder, and wedges are used to wedge and fix the radial support frames to the inner wall of the cylinder to eliminate the gap between the radial support frames and the single-section cylinder. Then, welding is performed to fix it, so as to support and constrain the single-section cylinder from the inside and prevent the single-section cylinder from deforming.

[0010] Furthermore, the radial support frame is a "rice" shaped support frame, and multiple wedges are used to wedge and fix it from both the top and bottom directions between the end of the "rice" shaped support frame and the inner wall of the cylinder.

[0011] Furthermore, after the adaptive support structure is installed, loosen the upper and lower mounting positions on the outside of the single-section cylinder, use the internal adaptive support structure of the single-section cylinder to constrain the deformation of the single-section cylinder, use the external lifting lugs to rotate the single-section cylinder 180°, align the rotation center according to the already machined inner curved surface process, use the machine tool chuck to clamp and position the single-section cylinder, and finish machine the flange and stop at the other end of the single-section cylinder.

[0012] Furthermore, during the machining process, an indirect measurement method is used to control the boundary dimension accuracy of the single-section cylinder. Specifically, a process extension section with a height of h is left at both the upper and lower ends of the single-section cylinder. When the CNC program turns the inner curved surface of the single-section cylinder, straight segments are turned at the upper and lower process extension sections according to the dimensions of the adjacent inner curved surface boundary points, thereby forming cylindrical surfaces with a height of h that are equal to the diameter of the inner curved surface boundary points at the upper and lower parts of the inner curved surface of the single-section cylinder. Then, the diameter dimensions of the upper and lower cylindrical surfaces are measured with an inside micrometer. After passing the measurement, the upper process extension section is removed first, and the lower process extension section is removed after the workpiece is turned 180°.

[0013] Furthermore, after the multiple single-section cylinders are processed independently, the single-section cylinders are positioned and fitted with convex and concave stop joints, the flanges are aligned and assembled with bolts, and finally the self-adaptive support structure inside each single-section cylinder is removed to form a large multi-section combined curved surface cylinder.

[0014] Furthermore, during the 180° rotation of the workpiece, deformation is simulated using CAE, effectively controlling the deformation of a single section of the cylinder.

[0015] Beneficial effects: This invention addresses the characteristics of curved cylindrical structures by designing a special heightening and fixing device for vertical lathes during the turning process. By welding a process connecting block to the outer circle of the cylindrical body and connecting it to the heightening and fixing device, radial constraint is achieved during the machining of the cylindrical body, effectively improving the rigidity of the cylindrical body, reducing the risk of vibration and deformation of the cylindrical body during the turning process, and improving the machining accuracy and surface quality of the inner curved surface.

[0016] Large curved cylindrical bodies have large diameters and heights, and turning requires adjustment in two clamping states. During adjustment, external constraints need to be loosened, which can cause significant deformation of the cylinder. To address this, this invention designs an adaptive support structure. Before turning, this support is fixed inside the cylinder to constrain deformation, transforming the external fixing device constraint into an internal adaptive support constraint. This prevents deformation during cylinder adjustment before machining the other end and other parts. This effectively controls the cylinder deformation problem during the turning process.

[0017] Furthermore, the accuracy of the boundary diameter of multiple cylindrical sections is crucial to the final assembly and docking accuracy. Since the boundary dimensions of curved surfaces are linear dimensions, they are difficult to measure using measuring tools, making accuracy control challenging. This invention designs an indirect measurement method, which uses a CNC program to process a straight measurement area with the same boundary dimensions as the curved surface at the upper and lower ends of the cylindrical surface. By combining indirect measurement with CNC program control, the accuracy of the boundary dimensions of a single cylindrical section is effectively controlled, solving the boundary dimension control problem in the machining of curved cylindrical surfaces.

[0018] The method of this invention not only solves the problems of clamping and deformation control in the machining of curved cylinders and improves the rigidity of the cylinders during the turning process, ensuring the machining accuracy of the curved surface, but also adopts a measurement method that combines indirect measurement and CNC programming, which effectively controls the boundary dimension accuracy of the curved cylinders, improves the docking accuracy after the cylinders are assembled, and avoids problems such as step difference and misalignment at the docking position. Attached Figure Description

[0019] Figure 1 A schematic diagram of a large, multi-segment, composite curved cylindrical structure; Figure 2 This is a schematic diagram of a single-section cylindrical structure; Figure 3 This is a schematic diagram showing the welding positions of the process connection blocks; Figure 4 This is a frontal view of a single-section cylinder with multiple clamping points at the top and bottom. Figure 5 for Figure 4 A-direction schematic diagram (perspective view); Figure 6 A schematic diagram showing the connection between the heightening fixing device and the process connection block; Figure 7 for Figure 6 A schematic diagram of direction B; Figure 8 A schematic diagram of the adaptive support structure inside a single-section cylinder; Figure 9 for Figure 8 A schematic diagram of direction D; Figure 10 for Figure 8 A partial schematic diagram of the H direction; Figure 11 This is a schematic diagram of the wedge block structure; Figure 12 This is a schematic diagram of an indirect measurement method; Figure 13 This is a schematic diagram of the deformation simulated by CAE, where Figure 13 a is a schematic diagram of the deformation in the X direction. Figure 13 b is a schematic diagram of the deformation in the Y direction.

[0020] Reference numerals: 1 Process connecting block, 2 Height support, 3 Fixing device, 31 Fixing groove, 32 Center bolt, 33 Side adjusting screw, 4 Adaptive support structure, 41 "M" shaped support frame, 42 Wedge block, 5 Process extension section, 51 Straight section, 52 Curved section, 53 Inner curved surface boundary point, 6 Machine tool chuck, 7 Equal height pad, 8 Machine tool worktable. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] In this invention, a large multi-segment composite curved surface cylinder is assembled from multiple individually machined single-segment cylinders. During machining, the single-segment cylinders are first clamped and positioned. Multiple process connecting blocks 1 of the same height are evenly welded along the circumferential direction on the outer wall of the upper end of the single-segment cylinder. The lower end of the single-segment cylinder is fixed at multiple points using machine tool chucks 6. The upper end of the single-segment cylinder is fixed by connecting the process connecting blocks 1 to a vertical lathe-specific heightening and fixing device, thereby fixing the single-segment cylinder at multiple points at the upper end. After the upper and lower clamping and positioning are completed, the inner curved surface of the single-segment cylinder, one end flange, and stop are precision machined. Then, while maintaining the upper and lower multi-point clamping state, an adaptive structural support is installed inside the single-segment cylinder to support and constrain the single-segment cylinder from the inside. After that, the upper and lower clamps are released, the workpiece is rotated 180°, fixed by machine tool chucks 6, and the other end flange and stop of the single-segment cylinder are precision machined to complete the machining of the single-segment cylinder. The single-segment cylinders are assembled by using convex and concave stop positioning fits and bolt connections to form a composite curved surface cylinder.

[0023] The following detailed description of the processing of large multi-section combined cylinders, with reference to specific embodiments, is provided.

[0024] Example 1: Processing of a single-section cylinder.

[0025] 1. Clamping and positioning of the cylinder.

[0026] (1) Before processing a single section of the cylinder, such as Figure 3 As shown, process connection block 1 is welded on the outer wall of the upper end (referring to the large end) of the cylinder. Process connection block 1 is evenly distributed at four points in the circumferential direction, with consistent welding height. A round hole is drilled in the middle of the connection block for connection with the vertical lathe-specific heightening and fixing device during subsequent processing.

[0027] It should be noted that in this embodiment, the process connection block 1 is a rectangular connection block, and there are 4 process connection blocks 1. In actual use, the corresponding number can be set as needed.

[0028] The single-section cylinder is machined using a large CNC vertical lathe. The vertical lathe-specific heightening and fixing device includes a height support 2 and a fixing device 3. The upper surface of the fixing device 3 is provided with a fixing groove 31 corresponding to the process connection block 1. In this embodiment, the height support 2 is a vertical square box. In practice, those skilled in the art can also choose other suitable height supports 2.

[0029] (2) The lower end of the cylinder is supported by equal-height pads 7 and fixed by the machine tool jaws 6 of the large CNC vertical lathe. The rotation center of the single-section cylinder is aligned with the rotation center of the machine tool by adjusting the machine tool jaws 6. Then, four vertical square boxes are arranged on the machine tool worktable 8 at the positions corresponding to the process connection blocks 1. The fixing device 3 is assembled onto the vertical square boxes with bolts. By coarsely adjusting the position of the vertical square boxes, the process connection blocks 1 are aligned with the fixing grooves 31 on the fixing device 3. Figure 4-5 as shown in the figure; then, the vertical height of the fixing device (3) is fine-tuned by adjusting the waist-shaped hole on the fixing device (3), so that the bottom surface of the fixing groove (31) of the fixing device (3) fits the bottom surface of the process connecting block (1); in the vertical direction, the process connecting block (1) and the fixing groove (31) are fixed by a center bolt (32) passing through the central round hole, as Figure 6 shown in the figure; in the horizontal direction, threaded holes are arranged on each side surface of the fixing groove (31), and the threaded holes respectively correspond to the circumferential direction and radial direction of the single-section cylinder, as Figure 7 shown in the figure: on the radial side surface and the circumferential side surface, side adjusting screws (33, such as jackscrew screws) are respectively used to pass through the bolt holes to tightly push against the process connecting block (1), so as to realize the fixation in the horizontal direction. This ensures rigid connection of the upper end of the single-section cylinder in the turning process, improves the overall rigidity of the cylinder, eliminates the risk of cylinder deformation and vibration during turning, and improves the processing quality of the curved surface.

[0030] In this embodiment, four-point clamping of the lower part of the cylinder is realized by machine tool claws (6), and four-point clamping of the upper part of the cylinder is realized through the cooperation between the process connecting block (1) and the special height-increasing fixing device (3) for vertical lathe, that is, eight-point clamping on the upper and lower sides of the single-section cylinder is realized.

[0031] 2. After the clamping and positioning of the cylinder is completed, finish turning the inner curved surface of the cylinder and the flange and spigot at one end (referring to the large end) on a large numerical control vertical lathe.

[0032] 3. Install the self-adaptive support structure (4) on the cylinder.

[0033] After the finish machining of the inner curved surface and the flange and spigot at one end of the single-section cylinder is completed, keep the original eight-point upper and lower clamping state, and install at least two groups of self-adaptive support structures (4) inside the cylinder. Said self-adaptive support structure (4) comprises a radial support frame and wedges (42), and the quantity and installation height of the self-adaptive support structures (4) can be selected as required. For example, two groups of self-adaptive support structures can be installed at positions 300mm away from the upper and lower end faces of the single-section cylinder respectively, and the wedges (42) are used for wedge tightening and fixing between the radial support frame and the inner wall of the cylinder, so as to eliminate the gap between the radial support frame and the single-section cylinder, then welding and fixing are performed to realize supporting and restraining the cylinder from the inside and prevent cylinder deformation.

[0034] The radial support frame is a structure composed of a plurality of radially distributed support bars, and the end of each support bar is an arc plate. In this embodiment, a "M-shaped" (Chinese character for rice) support frame (41) is used as the radial support frame. Since the end of the support frame cannot completely fit the inner wall of the cylinder, wedge blocks are designed to be inserted from the upper and lower sides to eliminate the gap, as Figure 8 shown in the figure: two rows of M-shaped supports are arranged inside the cylinder, and 1:10 wedges (42) are adopted between the end of the "M-shaped" support frame (41) and the inner wall of the cylinder to eliminate the gap between the support and the cylinder, specifically, as Figure 9-11As shown in the figure, between each end of the "rice-shaped" support frame 41 and the inner wall of the single-section cylinder, a total of 6 wedges 42 are used for wedge fastening and fixing, with 3 wedges on the upper part and 3 wedges on the lower part, arranged symmetrically; the wedges 42 are wedge fastened and fixed from the upper and lower directions, and after being adjusted to meet the requirements, they are fixed by local spot welding, which can effectively control the axial movement of the support.

[0035] 4. Turn over the cylinder to process the other end.

[0036] Convert the original constraint state of eight-point clamping at the top and bottom into internal support constraint, then loosen each clamping position at the top and bottom outside the single-section cylinder, use two rows of adaptive support structures 4 inside the cylinder to constrain the cylinder deformation, improve the rigidity of the cylinder, turn the cylinder 180° by means of external lifting lugs, and the deformation during the turning process is simulated by CAE, as Figure 13 shown, it shows that under the internal support constraint, the deformation is controlled within 0.15mm, which effectively controls the deformation of the cylinder.

[0037] Then, on a large CNC vertical lathe, clamp the cylinder through the machine tool jaws 6, align the rotation center according to the alignment position of the machined inner curved surface process, and turn the flange and the spigot at the other end of the cylinder (referring to the small-end flange and spigot, while the large-end flange and spigot are processed in the first time), so as to complete the processing of the single-section cylinder.

[0038] In the above embodiment 1, by welding the process connection block 1 on the outer circle of the cylinder and matching with the special heightening fixing device for vertical lathe, the radial constraint of the upper end of the cylinder is realized, which effectively improves the rigidity of the cylinder, reduces the risk of tool vibration and cylinder deformation during turning, and improves the processing accuracy and surface quality of the inner curved surface; the internal adaptive support structure 4 is fixed inside the cylinder to constrain the cylinder deformation, and the external fixing device constraint is converted into internal adaptive support constraint, which ensures that no deformation occurs during the cylinder adjustment and installation operation, and then the remaining parts at the other end are processed, ensuring the processing accuracy.

[0039] After the single-section cylinders are processed, they need to be assembled to form a large-diameter curved cylinder. The dimensional accuracy of the boundary of multiple sections of cylinders is the key factor affecting the docking accuracy after final assembly. Since the curved surface boundary dimension cannot be measured by measuring tools, the present invention further designs an indirect measurement method. By processing the process straight section measurement area at the extended parts on both sides of the cylinder curved surface, a comprehensive measurement method combining indirect measurement and CNC program control is adopted, which effectively controls the boundary dimensional accuracy of the single-section cylinder.

[0040] Example 2: Indirect measurement method.

[0041] Based on embodiment 1, when processing the inner curved surface of the single-section cylinder, process lengthening sections 5 with a height of h are respectively reserved at the upper and lower ends of the single-section cylinder, as Figure 12As shown, during the machining process, when the CNC program turns the inner curved surface of the single-section cylinder, the upper process extension section 5 and the lower process extension section 5 are respectively turned into straight sections 51 according to the dimensions of the adjacent inner curved surface boundary point 53. That is, the inner surface of the single-section cylinder is turned into straight section 51 + curved section 52 + straight section 51, thereby forming cylindrical surfaces with a height h equal to the diameter of the inner curved surface boundary point 53 in the upper and lower parts of the inner curved surface of the single-section cylinder. Then, the diameter of the cylindrical surface of the upper and lower straight sections 51 is measured with an inside micrometer to obtain the diameter D of the inner curved surface boundary point 53. After passing the test, the upper process extension section 5 is removed first, and the lower process extension section 5 is removed after the workpiece is turned 180°. This achieves precise control of the boundary dimension accuracy of the single-section cylinder.

[0042] This embodiment 2 is a further optimization of embodiment 1. Based on embodiment 1, it further adopts a combination of indirect measurement and CNC programming to accurately control the curved surface boundary dimensions of the cylinder and improve the docking accuracy after the cylinder is assembled.

[0043] After each section of the cylinder is processed, the sections are assembled using convex and concave stop positioning fits and bolt connections. The overall rigidity of the curved cylinder assembly is good. Finally, the adaptive support structure 4 inside each section is removed to form a large multi-segment combined curved cylinder.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for processing a large, multi-segment composite curved surface cylinder, wherein the composite curved surface cylinder is assembled from multiple independently processed single-segment cylinders, characterized in that... When machining a single-section cylinder, the single-section cylinder is first clamped and positioned. Multiple process connection blocks of the same height are evenly welded along the circumference on the outer wall of the upper end of the single-section cylinder. The lower end of the single-section cylinder is fixed at multiple points using machine tool chucks. The upper end of the single-section cylinder is fixed by connecting the process connection blocks to the vertical lathe's special heightening and fixing device, thus fixing the single-section cylinder at multiple points at the upper end. After the upper and lower clamping and positioning are completed, the inner curved surface of the single-section cylinder and one end flange and stop are precision machined. Then, while maintaining the upper and lower multi-point clamping state, an adaptive support structure is installed inside the single-section cylinder to support and constrain the single-section cylinder from the inside. After that, the upper and lower clamps are released, the workpiece is rotated 180°, and after being fixed by machine tool chucks, the other end flange and stop of the single-section cylinder are precision machined to complete the machining of the single-section cylinder. The single-section cylinder is machined using a large CNC vertical lathe. The vertical lathe's dedicated heightening and fixing device includes a height support and a fixing device. The upper surface of the fixing device has a fixing groove corresponding to the process connection block. The lower end of the single-section cylinder is fixed using machine tool jaws. The single-section cylinder's rotation center is aligned with the machine tool's rotation center by adjusting the jaws. A height support corresponding to the process connection block is set on the machine tool's worktable. The fixing device is installed on the height support. The installation height ensures that the process connection block is aligned with the fixing groove. The vertical height of the fixing device is finely adjusted so that the bottom surface of the process connection block fits against the bottom surface of the fixing groove. Then, the process connection block is fixed to the fixing device in both the vertical and horizontal directions. During the machining process, an indirect measurement method is used to control the boundary dimension accuracy of the single-section cylinder. Specifically, the upper and lower ends of the single-section cylinder are each left with a process extension section of height h. When the CNC program turns the inner curved surface of the single-section cylinder, straight sections are turned according to the dimensions of the adjacent inner curved surface boundary points on the upper and lower process extension sections, thereby forming cylindrical surfaces of height h on the upper and lower parts of the inner curved surface of the single-section cylinder, which are equal to the diameter of the inner curved surface boundary points. Then, the diameter dimensions of the upper and lower cylindrical surfaces are measured with an inside micrometer. After passing the measurement, the upper process extension section is removed first, and the lower process extension section is removed after the workpiece is turned 180°.

2. The method for processing a large multi-segment combined curved surface cylinder according to claim 1, characterized in that, The bottom surfaces of the process connecting block and the fixing groove are respectively provided with fixing holes. In the vertical direction, the process connecting block and the fixing device are fixed by passing the center bolt through the fixing hole. In the horizontal direction, threaded holes are opened on each side of the fixing groove. The threaded holes correspond to the circumferential and radial directions of the single-section cylinder, respectively. The side adjusting screws are screwed into the threaded holes and tightened against each side of the process connecting block to achieve horizontal fixation of the process connecting block.

3. The method for processing a large multi-segment combined curved surface cylinder according to claim 2, characterized in that, Four process connection blocks are evenly welded along the circumference of the upper part of the single-section cylinder, and the lower part of the single-section cylinder is positioned at four points using machine tool chucks.

4. The method for processing a large multi-segment combined curved surface cylinder according to claim 1, characterized in that, After the inner curved surface of the single-section cylinder and the flange and stop at one end are precision machined, they are kept in a multi-point mounting state at the top and bottom. Two or more sets of adaptive support structures are installed inside the single-section cylinder. The adaptive support structure includes radial support frames and wedges. At least two rows of radial support frames are set in the vertical direction inside the single-section cylinder. Wedges are used to wedge and fix the radial support frames to the inner wall of the cylinder to eliminate the gap between the radial support frames and the single-section cylinder. Then, welding is performed to fix it, so as to support and constrain the single-section cylinder from the inside and prevent the single-section cylinder from deforming.

5. The method for processing a large multi-segment combined curved surface cylinder according to claim 4, characterized in that, The radial support frame is a "rice" shaped support frame. Multiple wedges are used to wedge and fix the end of the "rice" shaped support frame to the inner wall of the cylinder from both the top and bottom directions.

6. The method for processing a large multi-segment combined curved surface cylinder according to claim 1, characterized in that, After the adaptive support structure is installed, loosen the upper and lower mounting positions on the outside of the single-section cylinder. Use the internal adaptive support structure of the single-section cylinder to constrain the deformation of the single-section cylinder. Use the external lifting lugs to rotate the single-section cylinder 180°. Then, align the rotation center according to the already machined curved surface process. Use the machine tool chuck to mount and position the single-section cylinder. Finally, precision machine the flange and stop at the other end of the single-section cylinder.

7. The method for processing a large multi-segment combined curved surface cylinder according to claim 1, characterized in that, After multiple individual cylindrical sections are independently processed, they are positioned and fitted with convex and concave stop joints, flanges are aligned and assembled with bolts, and finally the self-adaptive support structure inside each individual cylindrical section is removed to form a large multi-segment combined curved surface cylindrical section.

8. The method for processing a large multi-segment combined curved surface cylinder according to claim 1, characterized in that, During the 180° rotation of the workpiece, deformation is simulated using CAE, effectively controlling the deformation of a single section of the cylinder.

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