Machining method for ultra-large-diameter shield body in limit space

Abstract

The invention relates to a machining method for an ultra-large-diameter shield body in a limit space. The method comprises the steps that the shield body is divided into blocks to form circles around the center of a rotating table; mounting a tool rest on the rotary table, machining an assembly area at the lower position of the shield body, and removing the tool rest after machining; the cast iron platform is installed on a rotary workbench; an upper heightened base and a lower heightened base are designed and manufactured according to the height machining requirement of the shield body; a joist is designed and manufactured according to the shield body radius machining requirement; a lower heightening base is installed on the cast iron platform, an upper heightening base is installed on the lower heightening base, and a joist is installed on the upper heightening base; mounting the knife rest at one end of the joist; a balancing weight is mounted at the other end of the joist; inclined struts are mounted between the two ends of the joist and the lower heightened base; trial machining is conducted on the assembly area at the high position of the shield body, the machining deviation of the tool rest is measured, and the machining deviation is compensated in a programming difference compensation mode. According to the method, the machinability, the machining safety and the size precision controllability of the shield bodies with the super-large diameters, the super-large weights and the super-high weights are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of cutting and machining technology, and in particular to a method for machining ultra-large diameter shield bodies in extreme space. Background Technology

[0002] For the machining of the inner circle and end face of the shield, a special vertical lathe is generally used. The structure of the special vertical lathe is as follows: a rotary worktable is pre-embedded in the ground, a tool holder is installed on the rotary worktable, and the tool holder has a tool seat for installing the tool. The tool holder can drive the tool to move in both horizontal and vertical directions.

[0003] When machining a shield using a specialized vertical lathe, the shield is divided into sections arranged in a circle around the center of the lathe's rotary table, keeping the shield stationary on a steel plate on the ground. The rotary table, mounted on the ground at the center, rotates, driving the tool holder to perform the turning motion, thus machining the inner circle and end face of the shield. However, the vertical travel limit of the specialized vertical lathe's tool holder is approximately 2 meters, and the horizontal travel limit is approximately 0.8 meters, allowing for the machining of shields with a diameter of approximately 8 meters. The rotary table has a diameter of approximately 6.5 meters and is about 1 meter above the ground.

[0004] The ultra-large diameter shield has a diameter of approximately 13-15 meters, a height of approximately 7 meters, and a weight of approximately 410-510 tons. Figure 1 As shown in the diagram, the inner circular surface one at the lower part of the shield body, and the inner circular surface two and inner end face two at the higher part of the shield body are high-precision assembly areas, which require machining. Apart from these, the inner circular surfaces and end faces at other locations on the shield body are non-assembly areas and do not require machining.

[0005] The aforementioned types of shields exceed weight limits, making overall hoisting beyond the capabilities of conventional hoisting machines and thus impossible. The shield diameter and height also exceed limits, making machining operations impossible with existing machine tools. The heavy weight and higher center of gravity of the shields compromise safety, necessitating processing while maintaining a stationary position on the ground. Machining these extra-dimensional shields can result in a conical profile due to rigidity, making dimensional accuracy difficult to control.

[0006] It should be noted that while the rotary table and tool holder of the specialized vertical lathe can machine the inner circular surface C at the bottom of the shield, it is difficult to machine the inner circular surface A and the inner end face B at the top of the shield. This is because the diameter, height, and weight of the shield exceed the machining limit of a conventional specialized vertical lathe. In other words, the height of the ultra-large diameter shield is approximately 7 meters, and the required inner diameter is approximately 13 to 15 meters, far exceeding the travel limit of the specialized vertical lathe.

[0007] Since the rotary table of the special vertical lathe is fixedly installed on the ground, changing the machining height of the special vertical lathe by raising and moving the rotary table would allow the tool holder to machine higher positions on the shield body. However, this presents several challenges. First, adjusting the center reference and level of the rotary table after raising it would be difficult, leading to secondary shift errors with the center of other machined positions on the shield structure, thus affecting accuracy. Second, as the base of the special vertical lathe, raising the rotary table off the ground would weaken the overall rigidity of the equipment, making vibration difficult to control. Summary of the Invention

[0008] To address the challenge of machining ultra-large diameter shields using specialized vertical lathes, this invention provides a method for machining ultra-large diameter shields in extreme space. The method utilizes a tool holder to directly machine the assembly area at the lower part of the shield, and then further machines the assembly area at the higher part of the shield by raising and extending the tool holder. The tool holder is always installed based on the rotary table, ensuring consistency of the machining center datum, preventing changes in the machining center, and guaranteeing accurate shield machining precision.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A method for manufacturing ultra-large diameter shield bodies in extreme space includes the following steps:

[0011] Step 1: The shield body is divided into sections and assembled into circles around the center of the rotary worktable on the ground steel plate. This keeps the shield body stationary on the ground steel plate, improving safety during the processing.

[0012] Step 2: Install the tool holder on the rotary worktable and use the tool holder to process the circular surface of the assembly area at the lower part of the shield body. After processing, remove the tool holder to prepare for processing the assembly area at the higher part of the shield body.

[0013] Step 3: Install the cast iron platform above the rotary table;

[0014] Step 4: Design and manufacture the upper and lower height-adjusting bases according to the processing requirements in the height direction of the shield body; design and manufacture the support beams according to the processing requirements in the radius direction of the shield body.

[0015] Step 5: Install the lower lifting base above the cast iron platform and the upper lifting base above the lower lifting base to facilitate the raising of the tool holder. Install the support beam above the upper lifting base to facilitate the extension of the tool holder's machining radius.

[0016] Step 6: Install the tool holder on one edge of the support beam. During installation, ensure the tool holder is level by leveling. Install a counterweight on the other edge of the support beam. The counterweight balances the weight of the overhanging special vertical lathe tool holder, which improves the stability during rotation.

[0017] Step 7: Install diagonal braces at both ends of the support beam and between the lower raised base to improve the strength of the raised structure;

[0018] Step 8: Perform trial machining on the second circular surface and the second inner end surface of the assembly area at the high position of the shield body using the tool holder. Then measure the machining deviation of the tool holder and compensate for the machining deviation through programming to ensure machining accuracy.

[0019] Furthermore, during the turning process, the rotary table remains permanently mounted and positioned on the ground, ensuring the rigidity of the entire machining equipment and the consistency of its central reference.

[0020] Furthermore, in step 3, the cast iron platform is a drilling machine cast iron platform, and the cast iron platform is installed and fixed on the rotary worktable using a pressure plate and bolts.

[0021] Furthermore, in step 4, the lower heightening base includes a lower heightening frame, a lower heightening top plate, and a lower heightening bottom plate. The lower heightening frame is a rectangular frame with weight-reducing holes around its perimeter to reduce the weight of the lower heightening base. Lower stiffening plates are provided at the inner corners of the lower heightening frame to improve the structural strength of the lower heightening base. The lower heightening bottom plate and the lower heightening top plate are respectively provided at the bottom and top of the lower heightening frame, and the lower heightening bottom plate and the lower heightening top plate have the same cross-section.

[0022] Furthermore, in step 4, the raised base includes an raised frame, a raised bottom plate, and a raised top plate. The raised frame is also a rectangular frame with weight-reducing holes around its perimeter. Upper stiffening plates are provided at the corners of the inner wall of the raised frame. The raised bottom plate and raised top plate are respectively provided at the bottom and top of the raised frame, with the raised top plate being longer than the raised bottom plate. A reinforcing frame is also provided between the sides of the raised frame and the ends of the raised top plate. This improves the structural strength at both ends of the raised top plate.

[0023] Furthermore, in step 5, the lower raised base plate of the lower raised base is installed and connected to the cast iron platform by pins and screws; the lower raised top plate of the lower raised base and the upper raised base plate of the upper raised base are fixed together by flange connection.

[0024] Further, in step 4, the length of the supporting beam is greater than the length of the upper raised base. The supporting beam is bolted to the upper raised top plate of the upper raised base. The supporting beam includes supporting beam one and supporting beam two. Supporting beam one and supporting beam two are bolted together and fixed. After being connected and combined, supporting beam one and supporting beam two are arranged on the same plane. The length of supporting beam one is greater than the length of supporting beam two.

[0025] A knife holder is arranged on one end edge of the first support beam, and a counterweight is arranged on the second support beam.

[0026] Furthermore, in step 6, the leveling step of the tool holder includes: step 6.1, extending the slide of the tool holder horizontally;

[0027] Step 6.2: Place a frame level on the slide block that extends from the tool holder;

[0028] Step 6.3: Place adjusting shims under the tool holder base, use a frame level as the horizontal measuring instrument, adjust to make the slide level, and then fix it.

[0029] Furthermore, in step 8, the programming differential operation steps include: Step 8.1, using the adjusted tool holder to perform turning, making a trial cut on the inner circular surface 2 and the inner end surface 2 of the shield body, requiring 80-85% light exposure;

[0030] Step 8.2: Use a laser tracker to measure the taper of the inner circular surface 2 and the inner end surface 2 after the trial cut, and record the data;

[0031] Step 8.3: Record the measured taper deviation and compensate for it by reverse taper through manual programming to ensure the flatness and straightness of the machined surface.

[0032] The beneficial effects of the present invention through the above technical solution are:

[0033] This invention extends the vertical lathe's height limit by using a cast iron drilling platform and upper and lower height-enhancing bases, and extends its radius limit by using a support beam. Through the heightening and lengthening structural design, the tool holder can be raised, ensuring that the tool holder is adjusted to a high position on the shield body, which facilitates machining of the assembly area at the higher position.

[0034] The present invention features a tool holder and a counterweight at each end of the support beam. The counterweight balances the weight of the overhanging tool holder, ensuring rotational stability and improving machining quality. A frame-type level is used to measure and adjust the horizontal accuracy of the dedicated vertical lathe tool holder; a laser tracker is used to measure the test cut surface and program reverse differential compensation to compensate for rigidity fluctuations after the support beam is extended, thereby improving the machining accuracy of the shield body.

[0035] This invention enables both the dedicated vertical lathe rotary table and the shield body to maintain their position without changing, resulting in the lowest center of gravity of the shield and meeting the requirements for processing ultra-large diameter shield bodies beyond the limits; it also ensures the safety, consistency of reference, and controllability of precision in the processing and manufacturing of the shield body. Attached Figure Description

[0036] Figure 1 It is a cross-sectional view of an ultra-large diameter, ultra-high, and ultra-heavy shield body to be processed.

[0037] Figure 2 This is a schematic diagram of step 2 of the method for processing an ultra-large diameter shield in extreme space according to the present invention, in which the tool holder processes the inner circular surface.

[0038] Figure 3This is a front view of the tool holder in step 2 of the method for processing ultra-large diameter shield bodies in extreme space according to the present invention.

[0039] Figure 4 This is a top view of the tool holder in step 2 of the method for processing ultra-large diameter shield bodies in extreme space according to the present invention.

[0040] Figure 5 This is a schematic diagram of the cast iron platform in step 3 of the method for processing ultra-large diameter shield bodies in extreme space according to the present invention.

[0041] Figure 6 This is a schematic diagram of step 4 of the method for processing an ultra-large diameter shield in extreme space according to the present invention, showing the lower base being raised.

[0042] Figure 7 This is a schematic diagram of step 4 of the method for processing an ultra-large diameter shield in extreme space according to the present invention, showing the addition of a raised base.

[0043] Figure 8 This is a schematic diagram of the support beam in step 4 of the method for processing ultra-large diameter shield bodies in extreme space according to the present invention.

[0044] Figure 9 This is a schematic diagram of the assembly of the lower heightening base, the upper heightening base, and the support beam in step 5 of the method for processing ultra-large diameter shield bodies in extreme space according to the present invention.

[0045] Figure 10 This is one of the schematic diagrams of the tool holder installation in step 6 of the method for processing ultra-large diameter shield bodies in extreme space according to the present invention.

[0046] Figure 11 This is step 6 of the method for processing ultra-large diameter shield bodies in extreme space according to the present invention, and is the second schematic diagram of the tool holder installation. The counterweight and diagonal brace are not shown in the figure.

[0047] The attached diagram is labeled as follows: 1. Shield body, 101. Inner circular surface one, 102. Inner circular surface two, 103. Inner end surface two;

[0048] 2. Tool holder, 21. Base, 22. Column, 23. Slide, 24. Slide, 25. Vertical lead screw module, 26. Horizontal lead screw module, 27. Tool holder;

[0049] 3. Raise the base; 31. Raise the frame; 32. Raise the top plate; 33. Raise the bottom plate; 34. Raise the stiffening plate.

[0050] 4. Raised base, 41. Raised frame, 42. Raised bottom plate, 43. Raised top plate, 44. Rib plate, 45. Reinforcing frame;

[0051] 5 supporting beams, 51 supporting beam one, 52 supporting beam two;

[0052] 6. Rotary worktable, 7. Cast iron platform, 8. Weight reduction hole, 9. Guardrail, 10. Counterweight block, 11. Diagonal brace. Detailed Implementation

[0053] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings:

[0054] like Figures 2-11 As shown, a method for manufacturing ultra-large diameter shield bodies in extreme space includes the following steps:

[0055] Step 1: Divide the shield body 1 into sections and assemble them into a circle around the center of the rotary worktable 6 on the ground steel plate. The shield body 1 is composed of multiple sections. Assemble the multiple sections together to form a circular shield body 1. The axis of the shield body 1 is perpendicular to the ground.

[0056] After the shield body 1 is assembled, it remains stationary on the steel plate laid on the ground. At this point, the center of gravity of the shield body 1 is at its lowest, enhancing its stability and ensuring safety during the machining process. Simultaneously, during the turning process of the shield body 1, the installation state and position of the rotary table 6 on the ground are maintained unchanged, thereby ensuring the rigidity of the overall equipment and the consistency of its central reference.

[0057] Step 2: Install the tool holder 2 on the rotary table 6. After the rotary table 6 is running, the rotating tool holder 2 performs turning machining on the circular surface 101 in the assembly area at the lower position of the shield body 1. Figure 2 As shown; after processing, remove the tool holder 2 and separate the tool holder 2 from the rotary table 6.

[0058] Tool holder 2 is existing technology, such as Figure 3 and Figure 4 As shown, the tool holder 2 includes a base 21, a column 22, and a slide 23. The column 22 is vertically mounted on the base 21, and a slide block 24 is vertically slidably connected to the column 22. A vertical lead screw module 25 for driving the slide block 24 to move vertically is mounted on the column 22. The slide 23 is horizontally arranged and moves horizontally left and right along the slide block 24. A horizontal lead screw module 26 for driving the slide 23 to move horizontally is mounted on the slide block 24. Thus, the slide 23 can move horizontally and vertically. Horizontal movement is along the X-axis, and vertical movement is along the Z-axis. The horizontal travel limit of the slide 23 is 800 mm, and the vertical travel limit is 2000 mm. The end of the slide 23 has a tool holder 27 for mounting the tool.

[0059] Step 3: The cast iron platform 7 is installed above the rotary table 6, achieving a one-time height increase. The cast iron platform 7 is a drilling machine cast iron platform 7, such as... Figure 5 As shown; during installation, the cast iron platform 7 is installed and fixed on the rotary table 6 by means of a pressure plate and bolts.

[0060] Step 4: Design and manufacture the upper raising base 4 and the lower raising base 3 according to the processing requirements in the height direction of the shield body 1. For example... Figure 6 As shown, the lower heightening base 3 includes a lower heightening frame 31, a lower heightening top plate 32, and a lower heightening bottom plate 33. The lower heightening frame 31 is a rectangular frame with weight-reducing holes 8 around its perimeter. Lower stiffening plates 34 are provided at the inner corners of the lower heightening frame 31, with two lower stiffening plates 34 at each corner. The lower stiffening plates 34 are triangular. The lower heightening bottom plate 33 and the lower heightening top plate 32 are respectively provided at the bottom and top of the lower heightening frame 31, respectively. The lower heightening bottom plate 33 and the lower heightening top plate 32 have the same cross-section.

[0061] like Figure 7 As shown, the upper heightening base 4 includes an upper heightening frame 41, an upper heightening base plate 42, and an upper heightening top plate 43. The upper heightening frame 41 is also a rectangular frame. Weight reduction holes 8 are provided around the upper heightening frame 41. Upper stiffening plates 44 are provided at the corners of the inner wall of the upper heightening frame 41. The configuration of the upper stiffening plates 44 is the same as that of the lower stiffening plates 34, and will not be described again here.

[0062] The upper raised frame 41 has an upper raised base plate 42 and an upper raised top plate 43 at its bottom and top, respectively. The upper raised base plate 42 has the same cross-section as the lower raised top plate 32. The upper raised top plate 43 is longer than the upper raised base plate 42, so the two ends of the upper raised top plate 43 are suspended. To increase the structural strength of the upper raised top plate 43, a reinforcing frame 45 is also provided between the two sides of the upper raised frame 41 and the ends of the upper raised top plate 43. The reinforcing frame 45 is a triangular frame.

[0063] Simultaneously, the supporting beam 5 was designed and manufactured according to the machining requirements in the radial direction of the shield body 1. For example... Figure 8 As shown, the support beam 5 is 10 meters long, which is longer than the length of the upper base 4. The support beam 5 includes support beam 1 51 and support beam 2 52, which are bolted together and arranged on the same plane after being connected and combined. The length of support beam 1 51 is greater than the length of support beam 2 52. Guardrails 9 are installed on both sides along the length of the support beam 5.

[0064] Step 5: Install the lower raised base 3 on top of the cast iron platform 7, install the upper raised base 4 on top of the lower raised base 3, and install the support beam 5 on top of the upper raised base 4. Figure 9 As shown.

[0065] During installation, the lower raising base 3's lower raising plate 33 is connected to the cast iron platform 7 via pins and screws, thereby installing the lower raising base 3 on the cast iron platform 7 and achieving secondary raising.

[0066] During installation, the upper raising base 4 is fixed to the lower raising base 32 and the upper raising base 44 via a flange connection. Specifically, the lower raising base 32 and the upper raising base 42 each have several circular holes, and corresponding pairs of holes are connected by flange bolts, thus enabling the installation of the upper raising base 4 and the lower raising base 3, achieving a three-stage raising mechanism.

[0067] During installation, the support beam 5 is bolted to the upper raised top plate 43 of the upper raised base 4, thereby installing the support beam 5 on the upper raised base 4 and achieving an increase in processing radius.

[0068] Step 6: Install the tool holder 2 on the end edge of the support beam 51. That is, arrange the tool holder 2 on one end edge of the support beam 51. The support beam 51 is relatively long, used to extend the radius range that the tool holder 2 can process in the radial direction. Figure 10 and Figure 11 As shown.

[0069] Because the support beam 5 is a welded component and its end face is uneven, the tool holder 2 is leveled during installation. Specifically, the leveling steps for the tool holder 2 include: Step 6.1, extending the slide ram 23 of the tool holder 2 horizontally;

[0070] Step 6.2: Place a frame level on the slide block 23 that extends out of the tool holder 2;

[0071] Step 6.3: Place adjusting shims under the base 21 of the tool holder 2, use a frame level as the horizontal measuring instrument, adjust until the slide ram 23 is horizontal, and then fix the base 21 to the support beam 51 with bolts.

[0072] A counterweight 10 is installed on the other edge of the support beam 5, that is, a counterweight 10 is arranged on the second support beam 52. The counterweight 10 weighs 15-20T. The second support beam 52 is relatively short and is used to install the counterweight to balance the weight with the overhanging tool holder 2, so as to maintain stability and safety during rotation.

[0073] Step 7: Install diagonal braces 11 at both ends of the support beam 5 and between the lower raised base 3 to improve the rigidity of the entire raised structure. The diagonal braces 11 are approximately Y-shaped I-beams. The lower end of the diagonal brace 11 is spot-welded to the lower raised base 3, and the upper end of the diagonal brace 11 has two branches. One branch is spot-welded to the support beam 5, and the other branch is spot-welded to the upper raised top plate 43.

[0074] Step 8: Perform trial machining on the circular surface 102 and inner end face 103 of the assembly area at the high position of the shield body 1 using the tool holder 2. Then measure the machining deviation of the tool holder 2 and compensate for the machining deviation through programming to ensure machining accuracy.

[0075] In other words, since the tool holder 2 has a certain rigidity fluctuation when it rotates after being suspended by the support beam 5, there is a risk that the contour dimensions will be conical after machining. It is necessary to test the machining and measure the machining deviation of the tool holder 2, and compensate for the machining deviation of the tool holder 2 by means of "programming difference compensation method".

[0076] The programming differential operation steps include: Step 8.1, using the adjusted tool holder 2 to perform turning, making a trial cut on the inner circular surface 102 and the inner end surface 103 of the shield body 1, requiring 80-85% light exposure;

[0077] Step 8.2: Use a laser tracker to measure the taper of the inner circular surface 102 and the inner end surface 103 after the trial cut, and record the data;

[0078] Step 8.3: Record the measured taper deviation and compensate for it by reverse taper through manual programming to ensure the flatness and straightness of the machined surface.

[0079] After the programming is adjusted, the turning of inner circular surface 2102 and inner end surface 2103 can be carried out.

[0080] The purpose of this invention is to address the problem that the diameter, height, and load-bearing capacity of an ultra-large diameter shield 1 in extreme space exceed the processing limits of conventional machine tools. It provides a scientific processing method that not only meets the requirements for processing and manufacturing ultra-large diameter shield 1 in extreme space, but also ensures manufacturing safety, consistency of reference, and controllability of precision; reduces manufacturing costs, improves production efficiency, ensures product quality, and achieves good economic benefits.

[0081] Among them, the ultra-large diameter shield body 1 has the lowest center of gravity, keeping it stationary on the ground and ensuring processing safety. The dedicated vertical lathe's rotary table 6 maintains the ground installation without secondary movement, reducing the error of the center reference during secondary movement and ensuring the consistency of the center reference and processing rigidity. Through the horizontal adjustment of the tool holder 2 and the compensation for processing deviations, the dedicated vertical lathe can achieve spatial contour processing beyond the limits of height and radius, as well as the precision control of the corresponding processing dimensions. This ensures the machinability of the ultra-large diameter shield body 1 within its extreme space, processing safety, and controllable dimensional accuracy.

[0082] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention should be included within the scope of the present invention.

Claims

1. A method for processing ultra-large diameter shield bodies in extreme space, characterized in that, Includes the following steps: Step 1: Divide the shield (1) into sections and assemble them into circles around the center of the rotary worktable (6) on the ground steel plate, keeping the shield (1) stationary on the steel plate laid on the ground. Step 2: Install the tool holder (2) on the rotary worktable (6), and process the circular surface (101) in the assembly area at the lower position of the shield body (1) through the tool holder (2). After processing, remove the tool holder (2). Step 3: Install the cast iron platform (7) above the rotary table (6); Step 4: Design and manufacture the upper height base (4) and the lower height base (3) according to the processing requirements of the shield body (1) in the height direction; design and manufacture the support beam (5) according to the processing requirements of the shield body (1) in the radius direction. Step 5: Install the lower raised base (3) above the cast iron platform (7), install the upper raised base (4) above the lower raised base (3), and install the support beam (5) above the upper raised base (4); Step 6: Install the tool holder (2) on the edge of one end of the support beam (51). During installation, ensure that the tool holder (2) is level by leveling. Install the counterweight (10) on the edge of the other end of the support beam (5). Step 7: Install diagonal braces (11) between both ends of the support beam (5) and the lower heightened base (3); Step 8: Perform trial machining on the second circular surface (102) and the second inner end surface (103) of the assembly area at the high position of the shield body (1) using the tool holder (2), then measure the machining deviation of the tool holder (2), and compensate for the machining deviation by programming the differential compensation method to ensure machining accuracy.

2. The method for processing an ultra-large diameter shield body in extreme space according to claim 1, characterized in that, During the turning process, the shield body (1) maintains the installation status and position of the rotary table (6) on the ground without changing.

3. The method for processing an ultra-large diameter shield body in extreme space according to claim 1, characterized in that, In step 3, the cast iron platform (7) is the drilling machine cast iron platform (7), and the cast iron platform (7) is installed and fixed on the rotary table (6) by using a pressure plate and bolts.

4. The method for processing ultra-large diameter shield bodies in extreme space according to claim 1, characterized in that, In step 4, the lower heightening base (3) includes a lower heightening frame (31), a lower heightening top plate (32), and a lower heightening bottom plate (33). The lower heightening frame (31) is a rectangular frame. Weight reduction holes (8) are provided around the lower heightening frame (31). Lower stiffening plates (34) are provided at the inner corners of the lower heightening frame (31). The lower heightening bottom plate (33) and the lower heightening top plate (32) are respectively provided at the bottom and top of the lower heightening frame (31). The lower heightening bottom plate (33) and the lower heightening top plate (32) have the same cross-section.

5. The method for processing an ultra-large diameter shield body in extreme space according to claim 4, characterized in that, In step 4, the upper heightening base (4) includes an upper heightening frame (41), an upper heightening bottom plate (42), and an upper heightening top plate (43). The upper heightening frame (41) is also a rectangular frame. Weight reduction holes (8) are provided around the upper heightening frame (41). Upper stiffening plates (44) are provided at the corners of the inner wall of the upper heightening frame (41). The upper heightening bottom plate (42) and the upper heightening top plate (43) are respectively provided at the bottom and top of the upper heightening frame (41). The length of the upper heightening top plate (43) is greater than that of the upper heightening bottom plate (42). A reinforcing frame (45) is also provided between the two sides of the upper heightening frame (41) and the end of the upper heightening top plate (43).

6. The method for processing an ultra-large diameter shield body in extreme space according to claim 5, characterized in that, In step 5, the lower raised base plate (33) of the lower raised base (3) is installed and connected to the cast iron platform (7) by pins and screws; the lower raised top plate (32) of the lower raised base (3) and the upper raised base plate (42) of the upper raised base (4) are fixed together by flanges.

7. The method for processing an ultra-large diameter shield body in extreme space according to claim 5, characterized in that, In step 4, the length of the support beam (5) is greater than the length of the upper raised base (4). The support beam (5) is bolted to the upper raised top plate (43) of the upper raised base (4). The support beam (5) includes support beam one (51) and support beam two (52). The support beam one (51) and support beam two (52) are bolted together and fixed. After the support beam one (51) and support beam two (52) are connected and combined, they are arranged on the same plane. The length of support beam one (51) is greater than the length of support beam two (52). A knife holder (2) is arranged on one end edge of the first support beam (51), and a counterweight (10) is arranged on the second support beam (52).

8. The method for processing an ultra-large diameter shield body in extreme space according to claim 1, characterized in that, In step 6, the leveling steps of the tool holder (2) include: step 6.1, extending the slide (23) of the tool holder (2) horizontally; Step 6.2: Place a frame level on the slide (23) that is suspended from the tool holder (2); Step 6.3: Place an adjusting shim under the base (21) of the tool holder (2), use the frame level as the horizontal measuring instrument, adjust it to the horizontal level of the slide (23) and then fix it.

9. A method for processing ultra-large diameter shield bodies in extreme space according to claim 1, characterized in that, In step 8, the programming difference operation steps include: step 8.1, using the adjusted tool holder (2) to perform turning, and make a trial cut on the inner circular surface (102) and inner end surface (103) of the shield body (1), requiring 80-85% light exposure; Step 8.2: Use a laser tracker to measure the taper of the inner circular surface 2 (102) and the inner end surface 2 (103) after the trial cut, and record the data; Step 8.3: Record the measured taper deviation and compensate for it by reverse taper through manual programming to ensure the flatness and straightness of the machined surface.

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