A method for fabricating large porous thin-walled structures

Abstract

This application relates to a processing method for a large porous thin-walled structure, comprising the following steps: stress relief of an initial structural frame with metal tube mounting holes; machining the metal tube mounting holes to the design requirements; fixing the metal tube into the machined metal tube mounting holes, and performing secondary stress relief to form a large porous thin-walled structure. By stress relief of the initial structural frame before machining the metal tube mounting holes, the installation accuracy of the metal tubes can be improved, ensuring the correct position of the metal tubes within the mounting holes. Since the initial structural frame has already released all its stress, the secondary stress relief process only results in minor deformation at the metal tube mounting holes. This solves the problem in related technologies where stress relief after welding of large porous thin-walled structures affects the installation and machining accuracy of the structures.

Description

Technical Field

[0001] This application relates to the field of machining, specifically to a method for machining large porous thin-walled structures. Background Technology

[0002] Large porous thin-walled structures typically consist of a thin-walled outer cylinder, multiple metal tubes, and other components. In related technologies, each component of a large porous thin-walled structure is usually machined separately, then the machined components are welded together as a whole, and finally, the entire structure is stress-relieved. The dimensional and positional accuracy requirements of the hole systems in large porous thin-walled structures are high. However, due to the long axial length and thin wall thickness of the metal tubes, they are prone to deformation during assembly and welding. Furthermore, after stress relief, the parallelism and positional accuracy between the metal tubes in the large porous thin-walled structure will exceed tolerances, affecting the installation and machining accuracy of the large porous thin-walled structure. Summary of the Invention

[0003] This application provides a processing method for large porous thin-walled structures, which can solve the problem in related technologies where, after stress relief of the large porous thin-walled structure as a whole, the parallelism and positional accuracy between the metal tubes in the large porous thin-walled structure are out of tolerance, affecting the welding and machining accuracy of the large porous thin-walled structure.

[0004] In a first aspect, embodiments of this application provide a method for processing a large porous thin-walled structure, which includes the following steps: stress relief of an initial structural frame having metal tube mounting holes as a whole; processing the metal tube mounting holes to the design requirements; fixing the metal tube into the processed metal tube mounting holes and stress relief a second time to form a large porous thin-walled structure.

[0005] In conjunction with the first aspect, in one embodiment, machining the metal tube mounting holes to the design requirements includes: fixing the initial structural frame to the horizontal machining device; adjusting the initial structural frame so that the axis of each metal tube mounting hole is parallel to the table surface of the horizontal machining device; and machining the metal tube mounting holes to the design requirements.

[0006] In conjunction with the first aspect, in one embodiment, the initial structural frame includes a thin-walled outer cylinder, and an upper core plate and a lower core plate respectively fixed to both ends of the thin-walled outer cylinder. Adjusting the initial structural frame to make the axes of the metal tube mounting holes parallel to the table surface of the horizontal machining device includes: supporting the fixed support and adjustable support of the horizontal machining device at both ends of the thin-walled outer cylinder; test-boring the metal tube mounting holes of the upper core plate and the lower core plate respectively, so that each metal tube mounting hole on the upper core plate corresponds one-to-one with each metal tube mounting hole on the lower core plate and is coaxial; and determining whether to adjust the height of the adjustable support based on the test-boring results, so that the axes of the mounting holes of each metal tube are parallel to the table surface of the horizontal machining device.

[0007] In conjunction with the first aspect, in one embodiment, the process of machining the metal tube mounting hole to the design requirement includes: machining the stepped hole in the upper core plate and the end face of the upper core plate to enhance the flatness of the end face of the upper core plate and the periphery of the stepped hole.

[0008] In conjunction with the first aspect, in one embodiment, after fixing the metal tubes into the machined metal tube mounting holes and relieving the stress a second time, the method includes: boring the inner walls of each metal tube to make the wall thickness of each metal tube uniform.

[0009] In conjunction with the first aspect, in one embodiment, boring the inner walls of each metal tube to make the wall thickness of each metal tube uniform includes: fixing the initial structural frame to a horizontal machining device and completing trial boring at both ends of the metal tubes and machining the seat ring at the end of the thin-walled outer cylinder; fixing the thin-walled outer cylinder with trial boring marks to a vertical machining device; and machining the inner walls of each metal tube using a boring tool with the trial boring marks of the metal tubes as a reference.

[0010] In conjunction with the first aspect, in one embodiment, the boring tool includes: a handle; a coarse cutting head fixed to the handle; and a fine cutting head fixed to the handle, wherein along the extending direction of the handle, the distance between the end of the fine cutting head and the handle is less than the distance between the end of the coarse cutting head and the handle; and along the extending direction perpendicular to the handle, the distance between the end of the fine cutting head and the handle is greater than the distance between the end of the coarse cutting head and the handle.

[0011] In conjunction with the first aspect, in one embodiment, fixing the thin-walled outer cylinder with the test boring mark to the vertical machining device includes: using a plurality of equal-height positioning platforms installed on the vertical machining device to support the seat ring at the end of the thin-walled outer cylinder; adjusting the clamping device in the vertical machining device to support the flange of the thin-walled outer cylinder with the adjustable support device in the vertical machining device, so that the clamping device and the adjustable support device clamp the flange.

[0012] In conjunction with the first aspect, in one embodiment, the step of machining the inner wall of each metal tube using a boring tool with the test boring mark of the metal tube as a reference further includes: establishing a coordinate system using the test boring of the metal tube; finishing the stepped hole in the upper core plate at one end of the thin-walled outer cylinder and the end face near the upper core plate; setting the boring starting point of the metal tube, and driving the machining device to bore the inner wall of the metal tube along one direction of the coordinate system.

[0013] In conjunction with the first aspect, in one embodiment, after the driving machining device bores the inner wall of the metal tube along one direction of the coordinate system, the process includes: supporting the stepped hole on the top of the positioning support frustum of the vertical machining device; clamping and fixing the flange to the periphery of the thin-walled outer cylinder using the adjustable support device and clamping device of the vertical machining device; and finishing the end face of the seat ring and the annular groove formed in the seat ring.

[0014] The beneficial effects of the technical solutions provided in this application include:

[0015] By stress-relieving the initial structural frame before machining the metal tube mounting holes, the installation accuracy of the metal tubes can be improved, ensuring the correct position of the metal tubes within the mounting holes. Furthermore, stress relief after installation within the initial structural frame ensures that the initial structural frame has already released all its stress. The machining of the mounting holes before installation ensures the correct position of the metal tubes, and the subsequent secondary stress relief process results in only minor deformation at the mounting holes. This solves the problem in related technologies where overall stress relief after welding of large porous thin-walled structures affects the installation and machining accuracy of these structures. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the processing method for a large porous thin-walled structure provided in an embodiment of this application;

[0018] Figure 2 A half-sectional schematic diagram of a large porous thin-walled structure provided in an embodiment of this application;

[0019] Figure 3 A schematic diagram of the initial structural frame provided in the embodiments of this application being processed in a horizontal machining apparatus;

[0020] Figure 4A schematic diagram of the initial structural frame provided in this application embodiment, showing the fabrication of metal tubes within a vertical frame structure;

[0021] Figure 5 A schematic diagram of the initial structural frame provided in this application embodiment, showing the fabrication of annular grooves in a vertical frame structure.

[0022] Figure 6 This is a schematic diagram of the boring tool provided in an embodiment of this application;

[0023] Figure 7 A half-sectional structural diagram of the initial structural frame provided in the embodiments of this application;

[0024] Figure 8 This is a schematic diagram of the structure of the test boring hole on the mounting hole of the metal tube provided in an embodiment of this application;

[0025] Figure 9 This is a schematic diagram of the completed metal tube mounting hole provided in an embodiment of this application;

[0026] Figure 10 A schematic diagram of a metal tube installed in an initial structural frame, as provided in an embodiment of this application;

[0027] Figure 11 This is a schematic diagram of the structure of the test boring mark on the processed metal tube provided in an embodiment of this application.

[0028] In the picture:

[0029] 1. Initial structural frame; 11. Metal tube; 111. Test boring mark; 12. Thin-walled outer cylinder; 13. Upper core plate; 131. Stepped hole; 14. Lower core plate; 15. Seat ring; 151. Annular groove; 16. Flange;

[0030] 2. Metal tube mounting hole; 21. Test boring hole;

[0031] 3. Horizontal machining equipment; 31. Fixed support; 32. Adjustable support; 33. Fixing device;

[0032] 41. Knife handle; 42. Coarse blade tip; 43. Fine blade tip; 44. Washer;

[0033] 5. Vertical machining device; 51. Adjustable support device; 52. Clamping device; 53. Positioning support frustum; 54. Equal height positioning platform. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0035] This application provides a processing method for large porous thin-walled structures, which can solve the problem in related technologies where the parallelism and position of the metal tubes in the large porous thin-walled structure after stress relief treatment by overall welding are out of tolerance, affecting the installation and machining accuracy of the large porous thin-walled structure.

[0036] See Figure 1 and Figure 2 The diagram illustrates a method for fabricating a large porous thin-walled structure according to an embodiment of this application, which may include the following steps:

[0037] S1: The initial structural frame 1 with metal tube mounting holes 2 is stress-relieved as a whole. The initial structural frame 1 may include all other structures in the large porous thin-walled structure except for the metal tube 11. The initial structural frame 1 may be composed of multiple structures welded together.

[0038] S2: The metal pipe mounting holes 2 are machined to the design requirements. In this embodiment, the design requirements can refer to the size in which the inner diameter of each metal pipe mounting hole 2 matches the outer diameter of the metal pipe 11 to be installed.

[0039] S3: Fix the metal tube 11 into the processed metal tube mounting hole 2 and perform secondary stress relief to form a large porous thin-walled structure. During the secondary stress relief, since the initial structural frame 1 has already undergone stress relief once before, the stress of each structure on it has been basically released. Therefore, during the second stress relief, only the metal tube 11 may release a large amount of stress, making the overall deformation of the structure smaller than the overall deformation after all structures are installed and then stress relief is performed once.

[0040] In this embodiment, by relieving the stress of the initial structural frame 1 before machining the metal tube mounting holes 2 of the initial structural frame 1, the accuracy of metal tube installation can be improved. After the initial structural frame 1 is installed and stress-relieving is performed for the first time, the stress of each structure has been basically released, and each structure has deformed due to the release of its stress. Machining the metal tube mounting holes 2 in the already deformed initial structural frame 1 not only allows for secondary machining of the inner diameter of the metal tube mounting holes 2, ensuring that the metal tube 11 has the correct installation position in the metal tube mounting holes, but also, since the initial structural frame 1 has already largely released its stress, or even completely released it, the deformation of the large porous thin-walled structure can be small during the secondary stress relief. At this point, it can almost be considered that only the stress of the metal tube 11 is released, and it can be considered that only a slight deformation occurs at the metal tube mounting opening. This solves the problem in related technologies where, after the large porous thin-walled structure is installed and stress is relieved as a whole, the parallelism and position of each metal tube 11 will exceed the tolerance, affecting the installation and machining accuracy of the large porous thin-walled structure.

[0041] In some alternative embodiments, see Figure 3 As shown, machining the metal tube mounting holes 2 to the design requirements can include: fixing the initial structural frame 1 onto the horizontal machining device 3; adjusting the initial structural frame 1 so that the axis of each metal tube mounting hole 2 is parallel to the table surface of the horizontal machining device 3. After adjusting the position of the initial structural frame 1 on the horizontal machining device 3, the axis of each metal tube mounting hole 2 can be easily controlled when boring the metal tube mounting holes 2; machining the metal tube mounting holes 2 to the design requirements, that is, at this time, the inner diameter of each metal tube mounting hole 2 is adapted to the outer diameter of the metal tube 11, and the axis of each metal tube mounting hole 2 is parallel to each other and parallel to the table surface of the horizontal machining device 3, so that the axis of the subsequently installed metal tube 11 can also be parallel to the platform of the horizontal machining device 3, thereby enhancing the positional accuracy and parallelism between each metal tube 11.

[0042] In some optional embodiments, the initial structural frame 1 includes a thin-walled outer cylinder 12, and an upper core plate 13 and a lower core plate 14 respectively fixed to both ends of the thin-walled outer cylinder 12. Adjusting the initial structural frame 1 so that the axis of each metal tube mounting hole 2 is parallel to the table surface of the horizontal processing device 3 includes: supporting the fixed support member 31 and the adjustable support member 32 of the horizontal processing device 3 at both ends of the thin-walled outer cylinder 12 respectively. Preferably, the adjustable support member 32 can be supported at the position where the upper core plate 13 is fixed on the thin-walled outer cylinder 12, and the fixed support member 31 can be supported at the position where the lower core plate 14 is fixed on the thin-walled outer cylinder 12. Of course, the adjustable support member 32 can also be supported at the lower core plate 14, and the fixed support member can also be supported at the upper core plate 13. This arrangement can increase the supporting force of the horizontal processing device 3 on the initial structural frame 1, so that the initial structural frame 1 can be more stable when processing the metal tube mounting holes 2.

[0043] Furthermore, adjusting the initial structural frame 1 to make the axes of each metal tube mounting hole 2 parallel to the table surface of the horizontal machining device 3 may also include: test boring the metal tube mounting holes 2 of the upper core plate 13 and the lower core plate 14 respectively, so that each metal tube mounting hole 2 on the upper core plate 13 corresponds one-to-one with each metal tube mounting hole 2 on the lower core plate 14 and is coaxial. It should be understood that multiple metal tube mounting holes 2 can be opened in both the upper core plate 13 and the lower core plate 14. Before test boring, see Figure 7 and Figure 8As shown, the size of each metal tube mounting hole 2 can be relatively small and can be called the initial metal tube mounting hole 2. In this embodiment, the test boring of the metal tube mounting hole 2 can be performed by opening a test boring hole 21 along the axial direction of the metal tube mounting hole 2 at a position on the upper core plate 13 and the lower core plate 14 near the initial metal tube mounting hole 2. The length of the test boring hole 21 along the axial direction of the metal tube mounting hole 2 can be 2-3 mm, which is less than the thickness of the upper core plate 13 and the lower core plate 14. The adjustable support is adjusted based on the test boring results. Regarding the height of component 32, in this embodiment of the application, the method to determine whether the height of the adjustable support component 32 needs to be adjusted can be as follows: First, test bore all the metal tube mounting holes 2 on the upper core plate 13. The inner diameter of the test borehole 21 to be opened during the test borehole is approximately the same as the outer diameter of the metal tube 11. When all the initial metal tube mounting holes 2 have been tested, on the side of the upper core plate 13 where the test boreholes 21 are opened, the test boreholes 21 are spaced apart from each other, but the spacing is extremely small, and the end of the upper core plate 13 is almost invisible when they are close to each other. After removing the original "black skin," the initial structural frame 1 is rotated 180 degrees, and the lower core plate 14 is tested again. The test boring method for the metal tube mounting holes 2 on the lower core plate 14 is the same as that in the upper core plate 13. The position and size of each test boring hole 21 when it was tested on the upper core plate 13 are used to test boring in the lower core plate 14. After the test boring is completed, if each test boring hole 21 on the lower core plate 14 can achieve the same effect as each test boring hole 21 on the upper core plate, it is considered that the axis of each metal tube 11 mounting hole has been aligned with the horizontal machining device. If the test holes 21 on the lower core plate 14 achieve different effects than the test holes 21 on the upper core plate 13, the height of the adjustable support 32 can be adjusted according to the test boring results, that is, the pitch angle of the adjustable support 32 can be adjusted. After the adjustment is completed, test boring is performed again until the test holes 21 on the lower core plate 14 achieve the same effect as the test holes 21 on the upper core plate. By using test boring to make the axis of each metal tube mounting hole 2 parallel to the table surface of the horizontal processing device 3, the results can be more accurate.

[0044] It should be understood that the wall thickness of the thin-walled outer cylinder 12 in the initial structural frame 1 is usually relatively thin. After the initial structural frame 1 is installed and the stress is relieved for the first time, the shape of the thin-walled outer cylinder 12 may have changed and it may not be a very accurate cylindrical structure. Therefore, in this embodiment, by taking the parallelism between the axis of the metal tube mounting hole 2 and the table surface of the horizontal processing device 3 as a reference, the accuracy of the metal tube mounting holes 2 that need to be corresponding one-to-one on the upper core plate 13 and the lower core plate 14 can be increased.

[0045] In some alternative embodiments, see Figure 9As shown, the machining of the metal tube mounting holes 2 to the design requirements includes: machining the stepped holes 131 in the upper core plate 13 and the end face of the upper core plate 13 to enhance the flatness of the end face of the upper core plate 13 and the periphery of the stepped holes 131. That is, after making the axis of the mounting holes of each metal tube 11 parallel to the table surface of the horizontal machining device 3 through trial boring, the stepped holes 131 in the upper core plate 13 and the end face of the upper core plate 13 can be rough bored to make the stepped holes 131 in the upper core plate 13 and the end face of the upper core plate 13... The end face can be relatively flat, which reduces the subsequent machining allowance when the stepped hole 131 in the upper core plate 13 and the end face of the upper core plate 13 need to be precision machined. In addition, the machining of the metal tube mounting hole 2 can be based on the test boring hole 21 of the test boring, and the metal tube mounting hole 2 with the same size and position as the test boring hole 21 can be opened. It should be understood that after the test boring is completed, the order of machining the metal tube mounting hole 2 and machining the stepped hole 131 and the end face on the upper core plate 13 can be interchanged. Preferably, a fixing device 33 can also be provided on the horizontal machining device 3. The fixing device 33 can cooperate with the fixed support 31 and the adjustable support 32 respectively to clamp the positions of the upper core plate 13 and the lower core plate 14 of the initial structural frame 1 to prevent vibration during the test boring and subsequent boring process, which would affect the accuracy of the test boring and boring.

[0046] In some optional embodiments, after fixing the metal tube 11 into the processed metal tube mounting hole 2 and performing secondary stress relief, the process includes: boring the inner wall of each metal tube 11 to make the wall thickness of each metal tube 11 uniform. It should be understood that the metal tubes 11 in large porous thin-walled structures are usually thinner, and the precision of each metal tube 11 needs to meet certain requirements. In order to prevent the metal tubes 11 from deforming during the manufacturing process, the wall thickness of the metal tubes 11 can be made thicker during manufacturing to prevent deformation. After installing each metal tube 11 with the same outer diameter into the metal tube mounting hole 2, the metal tube 11 may also deform due to stress release during the stress relief process. Therefore, boring the inner wall of each metal tube 11 again after secondary stress relief can adjust the wall thickness of each metal tube 11 and make the wall thickness of each metal tube 11 uniform. The uniformity mentioned here should be understood as being as uniform as possible. In actual manufacturing, a certain range of error should be allowed.

[0047] In some optional embodiments, boring the inner walls of each metal tube 11 to make the wall thickness of each metal tube 11 uniform includes: fixing the initial structural frame 1 to the horizontal machining device 3, and completing the trial boring of both ends of the metal tube 11 and machining the seat ring 15 at the end of the thin-walled outer cylinder 12. At this time, the initial structural frame 1 should be fixed with each metal tube 11. Previously, after opening the metal tube mounting hole 2 and machining the upper core plate 13 on the horizontal machining device 3, a scribe line can be made on the fixed support 31 of the horizontal machining device 3, and the scribe line is also marked at the corresponding position on the initial structural frame 1. When the initial structural frame 1, which needs to be re-stressed and completed in the subsequent process, is re-fixed to the horizontal machining device 3, the scribe line on the initial structural frame 1 is aligned with the scribe line on the horizontal machining device 3 to perform preliminary leveling. Since the structures on the initial structural frame 1 may also deform during the secondary stress relief process, after the initial structural frame 1 is initially leveled, the trial boring method of the metal tube mounting hole 2 described above can also be used to perform trial boring on the metal tube 11. See Figure 10 and Figure 11 As shown, during the trial boring, the inner wall of the metal tube 11 is bored 2-3mm along its longitudinal direction. During the trial boring, the wall thickness difference of each metal tube 11 after the trial cut can be analyzed to determine the direction and amount of adjustment for the trial boring. The adjustment can be done by rotating the initial structural frame 1, the rotary table of the processing device, or adjusting the adjustable support 32, etc., to ensure that the wall thickness of the metal tube 11 in the tested portion is uniform when the trial boring is completed. In addition, after the trial boring of the metal tube 11 is completed, the initial structural frame 1 can be fixed on the horizontal processing device 3, and the end face of the seat ring 15 can be milled. The seat ring 15 can be fixed on the end face of the thin-walled outer cylinder 12 near the lower core plate 14, and the lower core plate 14 and the seat ring 15 can be set at a certain distance along the axial direction of the thin-walled outer cylinder 12.

[0048] Preferably, the thin-walled outer cylinder 12 with the test boring mark 111 is fixed to the vertical processing device 5. The inner wall of each metal tube 11 is processed using a boring tool with the test boring mark 111 as a reference. Normally, the boring tool and the processing tool that fixes the boring tool have a large weight. Therefore, in this embodiment, the metal tube 11 with the test boring completed is processed on the vertical processing device 5. This can reduce the risk that the boring tool may fall and damage the metal tube 11 during the boring process due to its weight. In addition, in the vertical processing device 5, the processing device can also better control the boring tool to bore the metal tube 11 along the test boring mark 111. In this step, the boring tool directly bores the inner wall of the metal tube 11 along the axial direction of the metal tube 11 to form the final metal tube 11.

[0049] In some alternative embodiments, see Figure 6As shown, the boring tool includes: a handle 41, which can be fixed to the machining device; a roughing head 42, which is fixed to the handle 41; and a finishing head 43, which is fixed to the handle 41. By fixing the roughing head 42 and the finishing head 43 together on the same handle 41, the roughing and finishing of the inner wall of the metal tube 11 can be completed in one boring operation. Furthermore, along the extending direction of the handle 41, the distance between the end of the finishing head 43 and the handle 41 is less than the distance between the end of the roughing head 42 and the handle 41. In this embodiment, a shim 44 can be fixed between the roughing head 42 and the handle 41. Increasing the height of the coarse boring head 42 allows it to contact the inner wall of the metal tube 11 for rough boring during subsequent boring processes. Preferably, the tip of the coarse boring head 42 is 0.15mm-0.2mm higher than the tip of the finish boring head 43 in the extension direction of the handle 41. Furthermore, along the extension direction perpendicular to the handle 41, the distance between the end of the finish boring head 43 and the handle 41 is greater than the distance between the end of the coarse boring head 42 and the handle 41. During finish boring, the finish boring head 43 should bore deeper into the inner wall of the metal tube 11 radially than the coarse boring head 42. In this embodiment, the machining radius of the finish boring head 43 is approximately 0.25mm larger than that of the coarse boring head 42. By achieving both rough and finish machining of the metal tube 11 in a single boring operation, machining time can be effectively saved.

[0050] In some alternative embodiments, see Figure 4 As shown, fixing the thin-walled outer cylinder 12 with the test boring mark 111 to the vertical machining device 5 may include: using multiple equal-height positioning platforms 54 installed on the vertical machining device 5 to support the seat ring 15 at the end of the thin-walled outer cylinder 12. In this embodiment of the application, the seat ring 15 can also be machined during the test boring of the metal tube 11, so that all parts of the seat ring 15 can remain flat. After placing the flat seat ring 15 on the equal-height positioning platform 54, the axis of each metal tube 11 in the initial structural frame 1 can be perpendicular to the table surface of the vertical machining device 5, improving the boring of metal tubes. The machining accuracy of the bore 11 is as follows: The adjustable support device 51 in the vertical machining apparatus 5 is supported on the flange 16 of the thin-walled outer cylinder 12. The flange 16 can be fixed to the outer periphery of the thin-walled outer cylinder 12. The clamping device 52 in the vertical machining apparatus 5 is adjusted so that the clamping device 52 and the adjustable support device 51 clamp the flange 16. The adjustable support device 51 is then supported on the bottom surface of the flange 16, and the clamping device 52 is installed on the top surface of the flange 16. The clamping device 52 can also be height-adjustable to clamp flanges 16 of various heights. The clamping device 52 and the adjustable support device work together to reduce machining vibrations that may occur during boring and increase machining accuracy.

[0051] Furthermore, preferably, a matching device can be provided to cooperate with the level positioning platform 54 to fix the seat ring 15, further enhancing the stability of the initial structural frame 1.

[0052] In some optional embodiments, the step of machining the inner wall of each metal tube 11 using a boring tool with the test boring mark 111 of the metal tube 11 as a reference further includes: establishing a coordinate system using the test boring of the metal tube 11; after the initial structural frame 1 is placed on the vertical machining device 5 and the seat ring 15 is placed on the level positioning table 54 and positioned, the initial structural frame 1 can be aligned and a coordinate system can be established by the position of the test boring in the metal tube 11, and the established coordinate system is imported into the machining device; the stepped hole 131 in the upper core plate 13 at one end of the thin-walled outer cylinder 12 and the end face near the upper core plate 13 are precision machined; according to the imported coordinate system, the stepped hole 131 in the upper core plate 13 and the end face near the upper core plate 13 are precision boring using the machining device to ensure that the upper core plate 12 is properly machined. The accuracy of the stepped hole 131 and the end face near the upper core plate 13 in step 3 is improved because the stepped hole 131 and the end face near the upper core plate 13 have already been rough-bored during the trial boring of the metal tube mounting hole 2. Therefore, the fine boring can be completed more quickly in this process. The boring starting point of the metal tube 11 is set, and the machining device is driven to bore the inner wall of the metal tube 11 along one direction of the coordinate system. That is, after the coordinate system is imported into the machining device, the machining device can bore the inner wall of the metal tube 11 along one direction. At this time, only the boring starting point needs to be set. Moreover, the above method can also eliminate the machine tool backlash and improve the position accuracy of each metal tube 11 hole. Each metal tube 11 hole can be formed in one boring operation by using the designed metal tube 11 boring tool.

[0053] In some alternative embodiments, see Figure 5As shown, after the driving machining device bores the inner wall of the metal tube 11 along one of the coordinate systems, it may include: supporting the stepped hole 131 on the top of the positioning support frustum 53 of the vertical machining device 5. That is, the positioning support frustum 53 is also fixed on the vertical machining device 5. After the hole of the metal tube 11 is machined, the initial structural frame 1 is removed from the vertical machining device 5. By rotating it 180 degrees, the upper core plate 13 end of the initial structural frame 1 can be supported on the vertical machining device 5. Since the wall thickness of the thin-walled outer cylinder 12 is relatively thin, the positioning support frustum 53 is set to support the stepped hole 131 of the upper core plate 13. Support is provided at hole 131; the adjustable support device 51 and clamping device 52 of the vertical machining device 5 are used to clamp and fix the flange 16 to the periphery of the thin-walled outer cylinder 12. The height of the adjustable support device 51 and clamping device 52 can be adjusted. After adjustment, the adjustable support device 51 and clamping device 52 can be used to clamp the flange 16, improving machining rigidity and reducing vibration; the end face of the seat ring 15 and the annular groove 151 opened in the seat ring 15 are precision machined. The end face of the seat ring 15 has been rough-bored when the metal tube 11 hole is test-bored. At this time, the machining allowance can be smaller when the end face of the seat ring 15 is precision-bored, which speeds up the machining accuracy.

[0054] In this embodiment of the application, the end face of the seat ring 15 and the annular groove 151 are rough and fine milled successively, which can improve the perpendicularity between the seat ring 15 and the axis of each metal tube 11, so that the items placed through the large porous thin-walled structure in subsequent use can be placed with higher accuracy.

[0055] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0056] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0057] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for processing large porous thin-walled structures, characterized in that, It includes the following steps: The initial structural frame (1) with metal tube mounting holes (2) is stress-relieved as a whole. The initial structural frame (1) includes a thin-walled outer cylinder (12) and an upper core plate (13) and a lower core plate (14) respectively fixed to both ends of the thin-walled outer cylinder (12). The initial structural frame (1) is fixed on the horizontal machining device (3); The fixed support (31) and adjustable support (32) of the horizontal processing device (3) are respectively supported at both ends of the thin-walled outer cylinder (12); Test bore the metal tube mounting holes (2) on the upper core plate (13) and the lower core plate (14) respectively, so that each metal tube mounting hole (2) on the upper core plate (13) corresponds to each metal tube mounting hole (2) on the lower core plate (14) and is coaxial; Based on the test boring results, determine whether to adjust the height of the adjustable support (32) so that the axis of the mounting hole of each metal tube (11) is parallel to the table surface of the horizontal machining device (3); Machining the metal tube mounting hole (2) to the design requirements; The metal tube (11) is fixed into the metal tube mounting hole (2) after processing, and the stress is relieved twice to form a large porous thin-walled structure.

2. The processing method for large porous thin-walled structures as described in claim 1, characterized in that, The machining of the metal tube mounting hole (2) to the design requirements includes: The stepped hole (131) in the upper core plate (13) and the end face of the upper core plate (13) are machined to enhance the flatness of the end face of the upper core plate (13) and the periphery of the stepped hole (131).

3. The processing method for large porous thin-walled structures as described in claim 1, characterized in that, After fixing the metal tube (11) into the machined metal tube mounting hole (2) and performing secondary stress relief, the process includes: The inner walls of each metal tube (11) are bored to make the wall thickness of each metal tube (11) uniform.

4. The processing method for large porous thin-walled structures as described in claim 3, characterized in that, The boring of the inner walls of each metal tube (11) to make the wall thickness of each metal tube (11) uniform includes: The initial structural frame (1) is fixed to the horizontal machining device (3), and the trial boring of both ends of the metal tube (11) and the machining of the seat ring (15) at the end of the thin-walled outer cylinder (12) are completed. The thin-walled outer cylinder (12) with the test boring mark (111) is fixed to the vertical machining device (5). The inner wall of each metal tube (11) is machined using a boring tool with the test boring mark (111) of the metal tube (11) as a reference.

5. The processing method for large porous thin-walled structures as described in claim 4, characterized in that, The boring tool includes: Knife handle (41); A coarse cutting head (42) is fixed to the handle (41). A fine cutting head (43) is fixed to the handle (41), and along the extension direction of the handle (41), the distance between the end of the fine cutting head (43) and the handle (41) is smaller than the distance between the end of the coarse cutting head (42) and the handle (41). In addition, along the extension direction perpendicular to the handle (41), the distance between the end of the fine blade (43) and the handle (41) is greater than the distance between the end of the coarse blade (42) and the handle (41).

6. The processing method for large porous thin-walled structures as described in claim 4, characterized in that, The process of fixing the thin-walled outer cylinder (12) with the test boring mark (111) to the vertical machining device (5) includes: The seat ring (15) at the end of the thin-walled outer cylinder (12) is supported by multiple equal-height positioning tables (54) installed on the vertical processing device (5). The adjustable support device (51) in the vertical processing device (5) is supported on the flange (16) of the thin-walled outer cylinder (12). Adjust the clamping device (52) in the vertical machining device (5) so that the clamping device (52) and the adjustable support device (51) clamp the flange (16).

7. The processing method for large porous thin-walled structures as described in claim 4, characterized in that, The method of machining the inner wall of each metal tube (11) using a boring tool with the test boring mark (111) of the metal tube (11) as a reference also includes: Establish a coordinate system using the metal tube (11) of the test boring machine; The stepped hole (131) in the upper core plate (13) at one end of the thin-walled outer cylinder (12) and the end face near the upper core plate (13) are precision machined. Set the boring start point of the metal tube (11) and drive the machining device to bore the inner wall of the metal tube (11) along one of the directions of the coordinate system.

8. The processing method for large porous thin-walled structures as described in claim 7, characterized in that, After the driving machining device bores the inner wall of the metal tube (11) along one of the directions of the coordinate system, the process includes: The stepped hole (131) is supported on the top of the positioning support frustum (53) of the vertical machining device (5); The adjustable support device (51) and clamping device (52) of the vertical processing device (5) are used to clamp and fix the flange (16) to the periphery of the thin-walled outer cylinder (12). The end face of the seat ring (15) and the annular groove (151) formed in the seat ring (15) are precision machined.

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