A processing method of a large-angle bent support rod with a rotary body section

Abstract

This invention relates to the field of machining technology and provides a method for machining a large-angle bent support rod with a cross-section of revolution, comprising the following steps: S1, blanking; S2, milling; S3, rough machining; S4, bending; S5, fixing the reference block to form an assembly; S6, refining the reference; S7, reference inspection; S8, determining the final digital model; S9, machining the outer shape and subsequent machining reference surfaces; S10, machining all surfaces and other features; S11, coordinate measuring machine inspection; S12, removing the reference block; S13, finishing the finished product. This invention determines the blank size based on the cylindrical dimensions of the minimum envelope of the bent support rod, avoiding extensive milling work starting from a cuboid blank, significantly reducing material removal, thereby lowering material costs and machining time; moreover, it ensures uniform allowance in all directions of the part's surface, minimizing the risk of deformation due to stress concentration or imbalance during machining, thus guaranteeing the high quality and high precision of the final product.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and more specifically, to a method for machining a large-angle bent support rod with a rotating cross-section. Background Technology

[0002] Some wind tunnel tests employ bent struts, primarily to overcome the limitations of straight struts in testing. The three-degree-of-freedom motion of a straight strut's web support is limited in range of motion, making it difficult to study aerodynamic / kinematic coupling characteristics at high angles of attack. Furthermore, it requires large openings on the model surface, severely interfering with airflow and aerodynamic characteristics. It can also cause structural damage to special models such as large aircraft and high-aspect-ratio UAVs, while airflow-induced vibrations negatively impact the test. Bent struts, on the other hand, can expand the model's maneuvering angle, reduce their own inertia and interference with airflow, and can conform to the rear body of special models, minimizing structural modifications.

[0003] A type of bending support rod in the prior art, such as Figure 2 and Figure 3 As shown, the middle main body of the bent support rod 1 has a cross-section of revolution and a large bend. One end is provided with a connecting seat 102 for connecting to the blower model, and the other end is provided with a connecting post 101 for connecting to the wind tunnel interface. In the processing of this type of bent support rod, the blank is conventionally set with the smallest envelope of a cuboid structure. Then, auxiliary process references are set according to processing needs, and rough, semi-finish, and finish machining of the parts are performed on this basis. The main method used in the part processing is CNC milling. After the machining is completed, the process references left on the support rod surface are removed by CNC milling. Then, the subsequent deburring and polishing are carried out by fitter work to complete the processing of the bent support rod.

[0004] The aforementioned processing method for the bent support rod requires forging a large steel ingot into a rectangular prism-like object during the preparation of the blank. Then, the blank is shaped into a hexagonal size before rough machining by milling (a large amount of material is removed during this process). CNC milling is then used to rough and semi-finish the hexagonal object according to the set process benchmarks. The processing cycle is very long, and the corresponding cost is also higher. At the same time, the amount of material removed during the processing is also large, which easily causes a large risk of deformation of the parts and affects the final quality of the parts. Summary of the Invention

[0005] The purpose of this invention is to provide a method for processing a large-angle bent support rod with a rotating cross section, so as to solve the above-mentioned defects of the prior art.

[0006] This invention is achieved through the following technical solution: A method for fabricating a large-angle bent support rod with a cross-section of revolution includes the following steps: S1. Blanking: In CAD software, unfold the bend corner of the bending support model, determine the cylindrical size of the minimum envelope of the bending support, and use this to determine the size of the cylindrical blank. S2, milling flat: milling flat the two sides of the cylindrical blank symmetrically; S3. Rough machining: The bending support rod is machined along its maximum contour by turning to remove material and form a rough semi-finished part with an eccentric stepped shaft structure. S4. Bending: Using the milled surface in step S2 as the bending reference, the rough-machined semi-finished part is bent according to the final shape of the bending support rod and the corresponding bending angle size to form a bent semi-finished part. S5. Fixing reference blocks to form an assembly: With the inner angle of the bend facing upwards, fix the first reference block on the lower side of the bend of the bent semi-finished part, fix the second reference block on the lower side of any end of the bent semi-finished part, and fix the third reference block on the upper side corresponding to the second reference block. S6. Adjust the reference: Make the bottom surfaces of the first reference block and the second reference block coplanar, and this surface shall be used as the first reference surface; make any one of the left and right surfaces of the first reference block perpendicular to the bottom surface, and the surface perpendicular to the bottom surface shall be used as the second reference surface; make the two milled flat surfaces on the bent semi-finished part symmetrically exposed to light, and make the front and rear surfaces of the first reference block and the second reference block coplanar with the two milled flat surfaces on the bent semi-finished part, and the centering surface of the front and rear surfaces of the first reference block shall be used as the third reference surface. S7. Reference Inspection: A coordinate measuring machine is used for inspection. The first, second, and third reference planes are used as references in the X, Y, and Z coordinate directions, respectively. Based on the theoretical digital model, the shape of the assembly formed after step S6 is inspected. After the coordinate data inspection is completed, the assembly is translated along the X, Y, and Z coordinate directions in the coordinate measuring machine software to make the allowance of the assembly's shape surface uniform in the top, bottom, left, right, front, and back directions, and within the tolerance range required by the technical requirements. This determines the actual difference between the assembly formed after step S6 and the theoretical digital model in the reference directions, and the value is recorded. S8. Determine the final digital model: Based on the values ​​recorded in step S7, adjust the positions of the first reference block, the second reference block, and the third reference block in the CAD software to ensure that the origin position of the current theoretical digital model coincides with the origin position after the translation detection in step S7, and use the current theoretical digital model as the final digital model for subsequent machining programming. S9. Machining the outer shape and subsequent machining reference surfaces: The outer shape of the assembly is machined on a CNC machine tool according to the CNC machining program compiled from the final digital model to form the first semi-finished part. The end face connecting the wind tunnel interface, the top surface of the third reference block, and the centering surface of the front and rear surfaces of the first reference block are used as three reference surfaces for subsequent machining and inspection. S10. Machining all surfaces and other features: Based on the machining datum formed in step S9, machine all surfaces and other features of the bent support rod. During the machining process, remove the second datum block to form the second semi-finished part. S11. Coordinate Measuring: Use a coordinate measuring machine to inspect the overall shape and features of the second semi-finished part and compare it with the theoretical digital model to ensure that the allowance on the top, bottom, left, right, front, and back of the part is uniform and within the tolerance range required by the technical requirements. S12, Remove reference blocks: Remove the first reference block and the third reference block; S13. Finished product finishing: The finished bent support rod is shaped, deburred, polished and then processed in sequence.

[0007] Furthermore, in step S1, the cylindrical blank size leaves a 3-5mm allowance in the normal direction of the cylindrical size of the minimum envelope of the bending support rod.

[0008] Furthermore, in step S1, the cylindrical blank undergoes ultrasonic testing, with a testing level requirement of Class I.

[0009] Furthermore, in step S2, a machining allowance of 5-8mm is reserved on one side.

[0010] Furthermore, in step S3, the turning process leaves a machining allowance of 5-10 mm in the normal direction of the maximum contour.

[0011] Furthermore, in step S4, before bending, a test plate is made according to the theoretical bending shape and size. After bending, the bent semi-finished part is inspected through the test plate, and the inspection gap is required to be no more than 3mm.

[0012] Furthermore, in step S4, the bending method is hot bending.

[0013] Furthermore, in step S5, the first reference block, the second reference block, and the third reference block are fixed by bonding or welding.

[0014] Furthermore, in step S12, the first reference block and the third reference block are removed by bonding the auxiliary process reference block and then removing them by CNC milling, with a polishing allowance of 0.1mm reserved.

[0015] Furthermore, in step S12, the removal method for the first reference block and the third reference block is wire cutting.

[0016] The technical solution of the present invention has at least the following advantages and beneficial effects: 1. In this invention, a cylindrical blank is directly used, and the blank size is determined based on the cylindrical size of the minimum envelope of the bent support rod. This avoids a large amount of milling work starting from a cuboid blank, significantly reducing the amount of material removed, thereby reducing material costs and processing time.

[0017] 2. In this invention, during the roughing stage (step S3), turning is used to process along the maximum contour, resulting in more uniform material removal. Simultaneously, through subsequent fixing of the reference block (step S5), reference repair (step S6), and reference detection and model adjustment using coordinate measuring machines (steps S7-S8), a precise machining reference system matching the actual shape of the part is established. This ensures uniform allowance in all directions of the part's surface during CNC finishing, minimizing the risk of deformation due to stress concentration or imbalance during machining, thereby guaranteeing the high quality and precision of the final product. Attached Figure Description

[0018] Figure 1 A flowchart illustrating a method for processing a large-angle bent support rod with a cross-section of revolution, provided by the present invention; Figure 2 A schematic diagram of a bending support rod provided for the prior art Figure 1 ; Figure 3 A schematic diagram of a bending support rod provided for the prior art Figure 2 ; Figure 4 A comparison diagram of the rough-machined semi-finished part and the bent support rod; Figure 5 This is a structural diagram of a rough-machined semi-finished part; Figure 6 This is a structural diagram of a bent semi-finished part; Figure 7 This is a schematic diagram of the detection card plate; Figure 8 A diagram showing the usage status of the detection card; Figure 9 This is a structural diagram of the assembly formed after the reference block and the bent semi-finished part are fixed together. Figure 10 This is a structural schematic diagram of the first semi-finished part; Figure 11 This is a structural schematic diagram of the second semi-finished part; Reference numerals: 1-Bent support rod, 101-Connecting column, 102-Connecting seat, 2-Roughly machined semi-finished part, 3-Bent semi-finished part, 4-First reference block, 5-Second reference block, 6-Third reference block, 7-First reference surface, 8-Second reference surface, 9-Fourth reference surface, 10-Fifth reference surface, 11-First semi-finished part, 12-Second semi-finished part, 13-Inspection plate. Detailed Implementation

[0019] refer to Figure 1A method for processing a large-angle bent support rod 1 with a cross-section of revolution, comprising steps S1-S13 in sequence: S1. Blanking: In the CAD software, unfold the corner of the bending support rod 1 model to determine the cylindrical size of the minimum envelope of the bending support rod 1, and use this to determine the size of the cylindrical blank. Specifically, the cylindrical size of the minimum envelope of the bending support rod 1 is deduced from the unfolded planar dimensions—the minimum envelope refers to the smallest cylinder that can completely enclose the shape of the finished bending support rod 1. Based on this cylindrical size, the specific size of the cylindrical blank (including subsequent machining allowance) is determined. This method can avoid material waste due to the blank size being too large, or insufficient machining allowance due to the blank size being too small.

[0020] In this embodiment, the cylindrical blank size has a 3-5mm allowance in the normal direction of the cylindrical size of the minimum envelope of the bending support rod 1. It should also be understood that the length of the cylindrical blank should also be reserved for subsequent bending and processing. This provides sufficient material adjustment space for subsequent roughing, bending, and other processes, avoiding material shortages during processing due to insufficient allowance.

[0021] In this embodiment, the cylindrical blank should also undergo ultrasonic testing, with a testing level of Class I. This pre-screens blanks with internal defects such as cracks and pores, preventing them from entering subsequent processing. This avoids scrapping of finished parts due to internal defects in the blank from the source, reducing processing costs and rework rates, while ensuring the structural strength of the finished bent support rod 1 to meet the high-strength requirements of scenarios such as wind tunnel testing.

[0022] S2. Milling: Symmetrically mill both sides of the cylindrical blank. Specifically, place the cylindrical blank prepared in step S1 on the milling machine table, fix it with a fixture, and then symmetrically mill both sides of the blank to form two parallel planes (i.e., milled flat surfaces). It is necessary to ensure the symmetry and flatness of the two planes to provide a clear positioning reference surface for subsequent roughing and bending processes.

[0023] In this embodiment, when milling the cylindrical blank symmetrically on both sides, a machining allowance of 5-8mm is reserved on each side.

[0024] S3. Rough Machining: Using turning, the bending support rod 1 is machined along its maximum contour to remove material and form a rough-machined semi-finished part 2 with an eccentric stepped shaft structure (e.g., ...). Figure 5 (As shown). Reference Figure 4 (Comparison diagram of rough-machined semi-finished part 2 and bending support rod 1) It is easy to understand that there is also an angle between the connecting column 101 of the bending support rod 1 used to connect the wind tunnel interface and the middle main body. This is formed by machining. Therefore, after removing the material to the maximum extent along the maximum contour of the bending support rod 1, the rough-machined semi-finished part 2 formed must be an eccentric stepped shaft structure.

[0025] In this embodiment, the turning process leaves a machining allowance of 5-10 mm in the normal direction of the maximum contour.

[0026] S4. Bending: Using the milled surface from step S2 as the bending reference, the rough-machined semi-finished part 2 is bent according to the final shape of the bending support rod 1 and the corresponding bending angle dimension to form the bent semi-finished part 3 (e.g., Figure 6 (As shown).

[0027] In this step, the bending method is hot bending. It should be understood that the temperature during the hot bending process should not affect the final strength and hardness of the part, that is, it should not cause destructive results to the part (such as cracks).

[0028] In addition, before bending, a test plate 13 is made according to the theoretical bending shape and size. It is easy to understand that the test plate 13 should be a pair (e.g., Figure 7 As shown), both together define the theoretical bending shape and dimensions. After bending, the bent semi-finished part 3 is inspected by the inspection plate 13 (e.g., ...). Figure 8 As shown, during testing, a pair of testing plates 13 clamp the bent semi-finished part 3, and the testing gap is required to be no more than 3mm. The maximum gap between the outline of the bent semi-finished part 3 and the theoretical outline on the testing plate 13 is no more than 3mm.

[0029] S5. Fixed reference blocks form an assembly (e.g.) Figure 9 As shown): With the inner angle of the bend pointing upwards, a first reference block 4 is fixed to the lower side of the bend of the bent semi-finished part 3. A second reference block 5 is fixed to the lower side of any end of the bent semi-finished part 3, and a third reference block 6 is fixed to the upper side corresponding to the second reference block 5. Alternatively, in this embodiment, the second reference block 5 and the third reference block 6 are fixed to the end of the bent semi-finished part 3 where the connecting seat 102 will be subsequently processed.

[0030] During the machining of the reference block, the surface of the reference block that contacts the bent semi-finished part 3 is designed to mimic the shape of the corresponding position of the bent semi-finished part 3 to ensure that it fits as closely as possible to the bent semi-finished part 3 after installation. Since it is planned to use the bottom surface of the first reference block 4 and the second reference block 5 as the first reference surface 7, any one of the left and right surfaces of the first reference block 4 as the second reference surface 8, and the centering surface of the front and rear surfaces of the first reference block 4 as the third reference surface, when fixing the reference block, it is necessary to ensure that the bottom surfaces of the first reference block 4 and the second reference block 5 are coplanar, and that the front and rear surfaces of the first reference block 4 are flush with the milled surface in step S1. At the same time, the perpendicularity of adjacent surfaces of the rectangular structure part is ensured during the machining of the first reference block 4.

[0031] In this embodiment, the first reference block 4, the second reference block 5, and the third reference block 6 can be fixed by either bonding or welding. In practical applications, the assembly of the first reference block 4, the second reference block 5, and the third reference block 6 is completed on a workbench, and the flatness of the workbench is no greater than 0.25mm. During fixing, efforts should be made to ensure that they coincide with the theoretical positions.

[0032] S6. Establishing the Datum: Milling is performed on a CNC machine tool to make the bottom surfaces of the first datum block 4 and the second datum block 5 coplanar. This coplanar surface will subsequently serve as the first datum surface 7. Either the left or right side of the first datum block 4 is made perpendicular to the bottom surface, with the perpendicular surface serving as the second datum surface 8. The two milled flattened surfaces on the bent semi-finished part 3 are symmetrically exposed (exposed surface means removing the oxide scale and revealing the metallic luster). The front and rear surfaces of the first datum block 4 and the second datum block 5 correspond one-to-one with the two milled flattened surfaces on the bent semi-finished part 3, with the center surface of the front and rear surfaces of the first datum block 4 (i.e., the symmetrical center surface of the front and rear surfaces of the first datum block 4) serving as the third datum surface. The exposure amount on one side should not exceed 1mm, the flatness requirement should not exceed 0.1mm, and the perpendicularity requirement should not exceed 0.1mm. The core of this step is to establish a unified datum system to provide a reference for subsequent processing and inspection.

[0033] S7. Reference Inspection: A coordinate measuring machine is used for inspection. The first reference plane 7, the second reference plane 8, and the third reference plane are used as references in the X, Y, and Z coordinate directions, respectively. Based on the theoretical digital model, the shape of the assembly formed after step S6 is inspected. After the coordinate data inspection is completed, the assembly is translated along the X, Y, and Z coordinate directions in the coordinate measuring machine software to make the allowance of the assembly's shape surface uniform in the top, bottom, left, right, front, and back directions, and within the tolerance range required by the technical requirements. This determines the actual difference between the assembly formed after step S6 and the theoretical digital model in the reference directions, and the value is recorded. S8. Determine the final digital model: Based on the values ​​recorded in step S7, adjust the positions of the first reference block 4, the second reference block 5, and the third reference block 6 in the CAD software. This ensures that the actual discrepancy detected in step S7 is reflected in the digital model, guaranteeing that the origin position of the current theoretical digital model coincides with the origin position after translation detected in step S7. The current theoretical digital model is then used as the final digital model for subsequent machining programming. This step achieves precise matching between the theoretical digital model and the actual part's posture, avoiding insufficient machining accuracy due to reference deviations.

[0034] S9. Machining the outer shape and subsequent machining reference surfaces: Using the first reference surface 7, the second reference surface 8, and the third reference surface as machining references, the outer shape of the assembly is machined on a CNC machine tool according to the CNC machining program compiled from the final digital model, forming the first semi-finished part 11 (e.g., Figure 10As shown in the figure, the end face connecting the wind tunnel interface, the top surface of the third reference block 6, and the centering surfaces of the front and rear faces of the first reference block 4 are defined as the fourth reference surface 9, the fifth reference surface 10, and the sixth reference surface (to distinguish them from the first reference surface 7, the second reference surface 8, and the third reference surface mentioned above). These three surfaces will serve as the core references for subsequent processing and testing to ensure the consistency of the references in subsequent processes.

[0035] S10. Machining all surfaces and remaining features: Based on the machining datum formed in step S9, machine (select CNC machining) all surfaces and remaining features of the bent support rod 1. During the machining process, remove the second datum block 5 (to avoid it interfering with the machining of the part's surface) to form the second semi-finished part 12 (e.g., Figure 11 (As shown). In this step, a 0.1mm polishing allowance is reserved for all machined surfaces.

[0036] S11. Coordinate measuring machine (CMM) inspection: The overall shape and features of the second semi-finished part 12 are inspected using a CMM and compared with the theoretical digital model to ensure that the allowances on the top, bottom, left, right, front, and back of the part are uniform and within the tolerance range required by the technical requirements. S12. Remove reference blocks: Remove the first reference block 4 and the third reference block 6. In practical applications, there are two options for removing the first reference block 4 and the third reference block 6. The first method is removal by wire EDM. Wire EDM has high precision and produces a smooth cut, making it particularly suitable for removing reference blocks from high-precision parts, reducing the workload of subsequent polishing processes. It also accommodates the disassembly requirements of reference blocks that are firmly fixed by welding or other methods. The second method is as follows: after bonding the auxiliary process reference block, remove it by CNC milling. This method requires a 0.1mm polishing allowance.

[0037] S13. Finished product finishing: The finished bending support rod 1 is successively shaped, deburred, polished and then processed by subsequent processes. The subsequent processes include flaw detection (magnetic particle testing for steel parts and penetrant testing for aluminum parts, with a flaw detection level requirement of Class I) and surface treatment (such as chrome plating and bluing).

[0038] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for processing a large-angle bent support rod with a section of revolution, characterized in that, The steps are as follows: S1. Blanking: In CAD software, unfold the bend corner of the bending support model, determine the cylindrical size of the minimum envelope of the bending support, and use this to determine the size of the cylindrical blank. S2, milling flat: milling flat the two sides of the cylindrical blank symmetrically; S3. Rough machining: The bending support rod is machined along its maximum contour by turning to remove material and form a rough semi-finished part with an eccentric stepped shaft structure. S4. Bending: Using the milled surface in step S2 as the bending reference, the rough-machined semi-finished part is bent according to the final shape of the bending support rod and the corresponding bending angle size to form a bent semi-finished part. S5. Fixing reference blocks to form an assembly: With the inner angle of the bend facing upwards, fix the first reference block on the lower side of the bend of the bent semi-finished part, fix the second reference block on the lower side of any end of the bent semi-finished part, and fix the third reference block on the upper side corresponding to the second reference block. S6. Adjust the reference: Make the bottom surfaces of the first reference block and the second reference block coplanar, and this surface shall be used as the first reference surface; make any one of the left and right surfaces of the first reference block perpendicular to the bottom surface, and the surface perpendicular to the bottom surface shall be used as the second reference surface; make the two milled flat surfaces on the bent semi-finished part symmetrically exposed to light, and make the front and rear surfaces of the first reference block and the second reference block coplanar with the two milled flat surfaces on the bent semi-finished part, and the centering surface of the front and rear surfaces of the first reference block shall be used as the third reference surface. S7. Reference Inspection: A coordinate measuring machine is used for inspection. The first, second, and third reference planes are used as references in the X, Y, and Z coordinate directions, respectively. Based on the theoretical digital model, the shape of the assembly formed after step S6 is inspected. After the coordinate data inspection is completed, the assembly is translated along the X, Y, and Z coordinate directions in the coordinate measuring machine software to make the allowance of the assembly's shape surface uniform in the top, bottom, left, right, front, and back directions, and within the tolerance range required by the technical requirements. This determines the actual difference between the assembly formed after step S6 and the theoretical digital model in the reference directions, and the value is recorded. S8. Determine the final digital model: Based on the values ​​recorded in step S7, adjust the positions of the first reference block, the second reference block, and the third reference block in the CAD software to ensure that the origin position of the current theoretical digital model coincides with the origin position after the translation detection in step S7, and use the current theoretical digital model as the final digital model for subsequent machining programming. S9. Machining the outer shape and subsequent machining reference surfaces: The outer shape of the assembly is machined on a CNC machine tool according to the CNC machining program compiled from the final digital model to form the first semi-finished part. The end face connecting the wind tunnel interface, the top surface of the third reference block, and the centering surface of the front and rear surfaces of the first reference block are used as three reference surfaces for subsequent machining and inspection. S10. Machining all surfaces and other features: Based on the machining datum formed in step S9, machine all surfaces and other features of the bent support rod. During the machining process, remove the second datum block to form the second semi-finished part. S11. Coordinate Measuring: Use a coordinate measuring machine to inspect the overall shape and features of the second semi-finished part and compare it with the theoretical digital model to ensure that the allowance on the top, bottom, left, right, front, and back of the part is uniform and within the tolerance range required by the technical requirements. S12, Remove reference blocks: Remove the first reference block and the third reference block; S13. Finished product finishing: The finished bent support rod is shaped, deburred, polished and then processed in sequence.

2. The processing method for a large-angle bent support rod with a section of revolution according to claim 1, characterized in that, In step S1, the cylindrical blank size should have a 3-5mm margin in the normal direction of the cylindrical size of the minimum envelope of the bending support rod.

3. The processing method for a large-angle bent support rod with a section of revolution according to claim 1, characterized in that, In step S1, the cylindrical blank undergoes ultrasonic testing, with a testing level requirement of Class I.

4. The processing method for a large-angle bent support rod with a section of revolution according to claim 1, characterized in that, In step S2, a machining allowance of 5-8mm is reserved on one side.

5. The processing method for a large-angle bent support rod with a section of revolution according to claim 1, characterized in that, In step S3, the turning process leaves a machining allowance of 5-10 mm in the normal direction of the maximum contour.

6. The processing method for a large-angle bent support rod with a section of revolution according to claim 1, characterized in that, In step S4, before bending, a test plate is made according to the theoretical bending shape and size. After bending, the bent semi-finished part is inspected through the test plate, and the inspection gap is required to be no more than 3mm.

7. The processing method for a large-angle bent support rod with a section of revolution according to claim 1, characterized in that, In step S4, the bending method is hot bending.

8. The processing method for a large-angle bent support rod with a section of revolution according to claim 1, characterized in that, In step S5, the first reference block, the second reference block, and the third reference block are fixed by bonding or welding.

9. The processing method for a large-angle bent support rod with a section of revolution according to claim 1, characterized in that, In step S12, the first reference block and the third reference block are removed by bonding the auxiliary process reference block and then removing it by CNC milling, with a polishing allowance of 0.1mm reserved.

10. The processing method for a large-angle bent support rod with a section of revolution according to claim 1, characterized in that, In step S12, the removal method for the first reference block and the third reference block is wire cutting.

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