Machining tool and machining method for nonmetal I-shaped thin-wall hollow rotary body structure
By combining the clamping soft claws and the internal support mechanism, along with a phased machining strategy and optimized cutting parameters, the problem of easy cracking of thin-walled epoxy glass cloth rods during machining was solved, achieving high-precision and stable machining results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-21
- Publication Date
- 2026-04-14
AI Technical Summary
When epoxy glass cloth rods are processed into thin-walled structures, they are prone to edge cracking and breakage due to stress concentration and vibration, which affects the quality of the parts. Especially when turning thin-walled parts, the pressure of the tool on the material and the release of internal stress can cause delamination or cracking, resulting in scrapped parts.
The clamping method adopts a combination of soft gripping claws and an internal support mechanism. The soft gripping claws are covered with soft material, and the internal support mechanism is connected to the lathe jaws through the base. Together with the insert, pressure plate, and clamping nut, it forms a uniform internal support force. Combined with a phased machining strategy, including alternating roughing at both ends, initial machining of the window, and finishing of the internal support, special tools and optimized cutting parameters are used.
High-precision machining of epoxy glass cloth rods was achieved, preventing deformation, vibration, and local stress concentration, ensuring the stability and final dimensional accuracy of thin-walled structures, and improving the pass rate of parts.
Smart Images
Figure CN121848167A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of non-metallic material processing technology. Background Technology
[0002] Epoxy glass cloth rods are composite materials made by impregnating glass fiber cloth with epoxy resin and curing it at high temperatures. They possess high strength, high insulation, high temperature resistance, and corrosion resistance, and are widely used in electronics, power, aerospace, and other fields. However, machining epoxy glass cloth rods can easily lead to delamination or edge chipping. Insufficient bonding between the glass fiber and resin can cause the fibers to be pulled out by cutting forces, affecting surface quality. A certain I-shaped coil frame part is made of epoxy glass cloth rod. The part has a hollow, thin-walled I-shaped rotating body structure with φ85mm circular flanges at both ends (thickness only 0.6±0.02mm), a φ45mm central through hole, a central window wall thickness of 0.8±0.06mm, and a total length of 150mm. The supplied raw material is φ90mm rod stock. The part requires a smooth surface, free of cracks and inclusions.
[0003] Since epoxy glass cloth rods are made by impregnating alkali-free glass cloth with epoxy resin and then rolling it layer by layer using a rolling equipment, followed by drying and curing, their toughness is relatively poor. When processing into thin-walled structures, they are prone to cracking or breakage at the edges due to stress concentration and processing vibration, which can lead to scrapping of parts. This is especially true when turning thin-walled sections, where the pressure of the tool on the material and the release of internal stress can cause such problems. Summary of the Invention
[0004] The purpose of this invention is to solve the above-mentioned technical problems by providing a machining tooling and machining method for a non-metallic I-shaped thin-walled hollow rotating body structure.
[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution: A machining fixture for a non-metallic I-shaped thin-walled hollow rotating body structure includes a clamping soft jaw adapted to a machine tool and an inner support mechanism. The outer periphery of the clamping soft jaw is covered with a soft material. The inner support mechanism includes an inner support fixture, which includes a base and an insert. The base is adapted to a lathe chuck. The insert is inserted into the inner cavity of the semi-finished raw material to be processed. The end of the insert is provided with a pressure plate and a clamping nut. The above-described solution achieves high-precision machining of brittle materials such as epoxy glass cloth rods through an innovative design of soft grippers and an internal support mechanism. The soft grippers, covered with a soft material, effectively disperse clamping pressure, avoiding material damage caused by direct contact with traditional metal jaws. The internal support mechanism, through a stable connection between the base and the lathe jaws, combined with an insert structure that can be inserted into the workpiece cavity, forms a uniform internal support force under the synergistic action of the pressure plate and the clamping nut. This combined internal and external clamping method is particularly suitable for machining I-shaped thin-walled structures, preventing deformation and vibration during machining and avoiding material delamination or cracking caused by localized stress concentration, thus providing a stable technological foundation for subsequent precision machining.
[0006] A machining method for a non-metallic I-shaped thin-walled hollow rotating body structure using the above-mentioned tooling includes the following steps: Step S1: Fix the outer circle of the blank workpiece with a clamping soft claw, perform rough turning, drill holes, and then perform boring. Step S2: Use a clamping soft jaw to fix the outer circle of the other end of the blank workpiece, perform rough turning, drilling, and then boring; Step S3: Change the cutting tool, perform initial machining of the window, turn the I-shaped window to form the inner cavity of the semi-finished raw material; Step S4: Using the internal support mechanism, the embedded part is embedded into the inner cavity of the semi-finished raw material, and fixed with pressure plates and clamping nuts. The outer circle of the base is clamped on the lathe and precision machined to remove the flange allowance at one end of the window, the wall thickness allowance of the center window, and the wall thickness allowance of the circular flange. Step S5: The other end of the workpiece is processed using the method in step S4 to obtain a rough-machined semi-finished raw material; Step S6: Perform fine processing on the semi-finished raw materials, and complete the processing of the wall thickness of the circular flanges at both ends and the window to the final dimensions. The above-described scheme effectively controlled the deformation problem of thin-walled parts through a phased processing strategy. First, a baseline was established using alternating rough machining at both ends. Then, initial machining through a window was used to form the internal cavity support structure. Finally, a finishing mechanism was used for finishing. This progressive processing sequence, "from outside to inside, from rough to fine," combined with the use of specialized tooling, enabled more precise control of the wall thickness of the thin-walled structure. In particular, the finishing process following the use of the internal support mechanism in steps S4-S6, by removing excess material step by step, ensured processing stability and achieved final dimensional accuracy, solving the technological challenges of easy deformation and difficult clamping in the processing of non-metallic thin-walled parts.
[0007] Further, in steps S1 and S2, a φ90mm, 156mm long epoxy glass cloth rod is cut as the blank. Rough turning is performed using a carbide 95° tool, with one end held by soft jaws to flatten the end face. The lathe spindle speed is 950~1070 r / min, the feed rate is 0.12~0.15 mm / r, and the depth of cut is 0.7~1mm. Drilling is done using a U-shaped drill bit, specifically a φ30mm spring steel U-shaped drill bit, to a depth of... 80mm, lathe spindle speed 950~1070r / min, feed rate 0.07~0.09mm / r, boring with carbide 90° tool, lathe spindle speed 950~1070r / min, feed rate 0.1~0.12mm / r, depth of cut 1.2~1.5mm, turn around, soft jaws hold the other end of the outer circle, flatten the end face, turn the total length 150mm, turn the outer circle, drill the inner hole, tool and machining parameters selection is the same as above. The above scheme refines the roughing parameters, achieving efficient and safe material removal through optimized cutting parameter combinations. Using a 95° carbide tool with a high rotation speed of 950-1070 r / min maintains cutting efficiency while utilizing the thermal properties of the epoxy glass cloth rod. The selection of a U-shaped drill bit and a small feed rate of 0.07-0.09 mm / r effectively reduces axial force during drilling, preventing interlayer peeling. During boring, the combination of a depth of cut of 1.2-1.5 mm and a feed rate of 0.1-0.12 mm / r controls cutting vibration while ensuring machining efficiency.
[0008] Furthermore, in step S3, the cutting tool is changed to a cemented carbide 55° cutting tool for initial machining of the window. The I-shaped window is machined from the center of the bar stock to the clamping end. Specifically, the I-shaped window is machined from the center of the bar stock to the clamping end. The lathe spindle speed is 500~600 r / min, the feed rate is 0.12~0.15 mm / r, the depth of cut is 0.4~0.5 mm, and the wall thickness of the center window is left to 2 mm. The above-described scheme employs a machining strategy of medium-low speed combined with a small depth of cut of 0.4-0.5mm, progressively turning from the center towards the clamping end effectively controls the direction of cutting resistance and avoids vibration in the overhanging portion. Particularly noteworthy is the 2mm wall thickness allowance, which provides sufficient margin for finishing while ensuring the structural strength of the semi-finished material during process transitions.
[0009] Furthermore, in steps S4 and S5, a preliminary finishing turning is performed using a carbide 90° tool to remove the flange allowance at one end of the window. The lathe spindle speed is 500~600 r / min, the feed rate is 0.1~0.12 mm / r, the depth of cut is 0.3~0.5 mm, the wall thickness of the center window is reduced to 2 mm, and the wall thickness of the circular flange is reduced to 3 mm. The other end is machined in the same way, with the wall thickness of the circular flange reduced to 3 mm. Thus, the rough-machined semi-finished raw material is obtained. The above scheme reduces the single-edge cutting load while ensuring surface quality. A 2mm and 3mm machining allowance are retained for the window wall thickness and flange wall thickness, respectively. This differentiated allowance design considers deformation compensation in subsequent processes. In particular, considering the anisotropic characteristics of the epoxy glass cloth rod, a symmetrical machining strategy effectively offsets internal stress, creating favorable conditions for final finishing.
[0010] Further, in step S6, a 90° carbide tool is used to radially turn the circular flange, with the tool feed direction from the outside to the inside radially. The lathe spindle speed is 500~600 r / min, the feed rate is 0.03~0.05 mm / r, and the depth of cut is 0.04~0.05 mm. Finally, a 55° carbide tool is used to finish the inner wall of the window at a 30° angle. The lathe spindle speed is 500~600 r / min, the feed rate is 0.03~0.05 mm / r, and the depth of cut is 0.2~0.25 mm. When the wall thickness margin is 0.5 mm, the depth of cut is changed to 0.08~0.1 mm. After completing the machining of the circular flanges at both ends and the window wall thickness to the final dimensions, the tooling and parts are removed. The dimensions and surface quality of the parts are checked to ensure they meet the requirements. A 55° carbide tool is then used to finish the inner wall of the window at a 30° angle. The above-described method, with its radial outward-to-inward tool path and an extremely small depth of cut of 0.04-0.05mm, effectively suppressed fiber pull-out defects. The 55° tool angled at 30° to machine the inner wall of the window created more favorable fiber cutting conditions rather than pulling. The staged strategy of adjusting cutting parameters, especially in the final 0.5mm allowance, ensured both machining efficiency and final dimensional accuracy. This composite machining method significantly improved the surface roughness of the finished product, solving common quality problems in epoxy-based composite material machining such as burrs and delamination, and greatly increasing the part yield.
[0011] The beneficial effects of this invention are as follows: 1. This invention has a simple structure and achieves high-precision machining of brittle materials such as epoxy glass cloth rods through an innovative design of clamping soft claws and internal support mechanism. This clamping method combining internal and external components is particularly suitable for machining I-shaped thin-walled structures, preventing deformation and vibration during machining and avoiding material delamination or cracking caused by local stress concentration, thus providing a stable process foundation for subsequent precision machining. 2. The phased processing strategy effectively controlled the deformation problem of thin-walled parts. First, a datum was established using alternating rough machining at both ends. Then, the internal cavity support structure was formed through initial machining of the window. Finally, a finishing mechanism was used for finishing. This progressive processing sequence, "from outside to inside, from rough to fine," combined with the use of specialized tooling, made the wall thickness control of the thin-walled structure more precise. In particular, the finishing process following the use of the internal support mechanism in steps S4-S6, by removing excess material step by step, ensured processing stability and achieved final dimensional accuracy, solving the technological challenges of easy deformation and difficult clamping in the processing of non-metallic thin-walled parts. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the processing flow of the present invention; Figure 2 This is a schematic diagram of the internal support tooling structure of the present invention; Figure 3 This is a schematic diagram of the clamping soft claw structure of the present invention.
[0013] Reference numerals: 11. Clamping soft claw; 12. Inner support fixture; 13. Base; 14. Embedded part; 15. Pressure plate; 16. Pressure nut. Detailed Implementation
[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0015] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.
[0016] Example 1 like Figure 2 and Figure 3As shown, this embodiment provides a machining fixture for a non-metallic I-shaped thin-walled hollow rotating body structure, including a clamping soft claw 11 adapted to a machine tool and an inner support mechanism. The outer periphery of the clamping soft claw 11 is covered with a soft material. The inner support mechanism includes an inner support fixture 12, which includes a base 13 and an insert 14. The base 13 is adapted to a lathe chuck, and the insert 14 is inserted into the inner cavity of the semi-finished raw material to be processed. The end of the insert 14 is provided with a pressure plate 15 and a clamping nut 16. In this embodiment, the clamping soft claw 11 is made of aluminum.
[0017] The innovative design of the clamping soft jaws 11 and the internal support mechanism enables high-precision machining of brittle materials such as epoxy glass cloth rods. The clamping soft jaws 11, with their soft material coating, effectively disperse clamping pressure, avoiding material damage caused by direct contact with traditional metal jaws. The internal support mechanism, through the stable connection between the base 13 and the lathe jaws, combined with the insert 14 structure that can be inserted into the workpiece cavity, forms a uniform internal support force under the synergistic action of the pressure plate 15 and the clamping nut 16. This combined internal and external clamping method is particularly suitable for machining I-shaped thin-walled structures, preventing deformation and vibration during machining and avoiding material delamination or cracking caused by local stress concentration, thus providing a stable process foundation for subsequent precision machining.
[0018] Reference Figures 1 to 3 This embodiment also discloses a processing method for a non-metallic I-shaped thin-walled hollow rotating body structure using the above-mentioned tooling, characterized by including the following steps: Step S1: Use the clamping soft jaw 11 to fix the outer circle of the blank workpiece, perform rough turning, drilling, and then boring; Step S2: Use the clamping soft claw 11 to fix the outer circle of the other end of the blank workpiece, perform rough machining turning, drilling, and then boring; Step S3: Change the cutting tool, perform initial machining of the window, turn the I-shaped window to form the inner cavity of the semi-finished raw material; Step S4: Using the internal support mechanism, the embedded part 14 is embedded into the inner cavity of the semi-finished raw material, and fixed by the pressure plate 15 and the clamping nut 16. The lathe clamps the outer circle of the base 13 and performs fine machining to remove the flange allowance at one end of the window, the wall thickness allowance of the center window, and the wall thickness allowance of the circular flange. Step S5: The other end of the workpiece is processed using the method in step S4 to obtain a rough-machined semi-finished raw material; Step S6: Perform fine processing on the semi-finished raw materials, and complete the processing of the wall thickness of the circular flanges at both ends and the window to the final dimensions.
[0019] Below is a specific processing example. The material of a certain I-shaped coil bobbin is epoxy glass cloth rod 3840. The structure of the part is a hollow thin-walled structure of I-shaped rotating body. The two ends are φ85mm circular flanges with a thickness of only (0.6±0.02)mm. The central through hole is φ45mm. The wall thickness of the central window is (0.8±0.06)mm. The total length is 150mm. The raw material supplied is φ90mm rod. The part is required to have a smooth surface, free of cracks and inclusions.
[0020] 1) A φ90mm, 156mm long epoxy glass cloth rod was used as the blank. One end was clamped with a soft jaw 11, the end face was flattened, and the outer diameter was machined using a carbide 95° cutting tool for rough turning. The lathe spindle speed was (950~1070) r / min, the feed rate was (0.12~0.15) mm / r, and the depth of cut was (0.7~1) mm. The roughing parameters were precisely defined, and efficient and safe material removal was achieved through optimized cutting parameter combinations.
[0021] 2) Drill and bore the inner hole using a φ30mm spring steel U-shaped drill bit to a depth of 80mm. The lathe spindle speed is (950~1070) r / min, and the feed rate is (0.07~0.09) mm / r. Replace with a carbide 90° tool to bore a φ39mm hole. The lathe spindle speed is (950~1070) r / min, the feed rate is (0.1~0.12) mm / r, and the depth of cut is (1.2~1.5)mm. Turn the lathe around, clamp the other end with soft jaws, flatten the end face, turn the total length 150mm, turn the outer diameter, and drill and bore the inner hole. The tool and machining parameters are selected as above.
[0022] 3) Replace the cutting tool with a 55° carbide tool. Perform initial turning of the I-shaped window from the center of the bar stock towards the clamping end. The lathe spindle speed is (500~600) r / min, the feed rate is (0.12~0.15) mm / r, and the depth of cut is (0.4~0.5) mm, leaving a wall thickness allowance of 2 mm for the center window. A machining strategy of medium-low speed combined with a small depth of cut of 0.4-0.5 mm is adopted, with progressive turning from the center towards the clamping end, effectively controlling the direction of cutting resistance and avoiding vibration in the overhanging part. Particularly noteworthy is the 2 mm wall thickness allowance, which provides sufficient allowance for finishing and ensures the structural strength of the semi-finished material during process transitions.
[0023] 4) Design a dedicated internal support fixture 12, with the structure as follows: Figure 2As shown, the inner support fixture 12 is inserted into the inner cavity of the semi-finished material using the embedded part 14. Both ends are clamped with pressure plates 15 and clamping nuts 16. The lathe clamps the outer circle of the fixture and performs preliminary finishing turning using a carbide 90° tool to remove the flange allowance at one end of the window. The lathe spindle speed is (500~600) r / min, the feed rate is (0.1~0.12) mm / r, the depth of cut is (0.3~0.5) mm, the wall thickness of the center window is left to 2 mm, and the wall thickness of the circular flange is left to 3 mm. The other end is processed in the same way, and the wall thickness of the circular flange is left to 3 mm. Thus, the rough-machined semi-finished material is obtained.
[0024] 5) Finally, a finishing process is performed. After machining the sample, optimal machining parameters are obtained to ensure the final dimensional accuracy and surface quality of the part. The finishing process begins with radial turning of the circular flange using a 90° carbide tool. The lathe spindle speed is (500~600) r / min, the feed rate is (0.03~0.05) mm / r, and the depth of cut is (0.04~0.05) mm. The tool feed direction is radial from the outside to the inside; otherwise, stress concentration may occur, causing the part to crack and break. Finally, a 55° carbide tool is used to finish the inner wall of the window at a 30° angle. The lathe spindle speed is (500~600) r / min, the feed rate is (0.03~0.05) mm / r, and the depth of cut is (0.2~0.25) mm. When the wall thickness margin is 0.5 mm, the depth of cut is changed to (0.08~0.1) mm. After machining the circular flanges at both ends and the window wall thickness to the final dimensions, remove the tooling and parts, and check that the dimensions and surface quality of the parts meet the requirements.
[0025] The radial, outward-to-inward tool path, combined with an extremely small depth of cut of 0.04-0.05mm, effectively suppressed fiber pull-out defects. A 55° tool with a 30° angled feed into the window's inner wall created more favorable conditions for fiber cutting rather than pulling. The staged strategy of adjusting cutting parameters, especially in the final 0.5mm allowance, ensured both machining efficiency and final dimensional accuracy. This composite machining approach significantly improved the surface roughness of the finished product, resolving common quality issues in epoxy-based composite material machining, such as burrs and delamination, resulting in a substantial increase in the part yield.
[0026] Implementation Principle: A phased processing strategy effectively controls the deformation of thin-walled parts. First, a datum is established using alternating roughing at both ends. Then, initial machining through a window forms the internal cavity support structure. Finally, a finishing mechanism is used for finishing. This progressive processing sequence, "from outside to inside, from rough to fine," combined with the use of specialized tooling, allows for more precise control of the wall thickness of the thin-walled structure. In particular, the finishing process following the use of the internal support mechanism in steps S4-S6, through step-by-step removal of excess material, ensures both processing stability and final dimensional accuracy, solving the technological challenges of easy deformation and difficult clamping in the processing of non-metallic thin-walled parts. The processing route, tooling, and cutting tools provided in this application have high adaptability and can be extended to the production of parts with similar structures. This method has a reasonable processing route, ensuring that the stress on the non-metallic thin-walled material during processing does not cause destructive damage. It has high processing stability; verified by large-scale parts production, the first-pass yield rate reaches 99%. The processing parameters are fixed, and the cutting tools used in this method are mature standard tools. The processing parameters meet the requirements of general lathes, and this method can be extended to different parts with similar structures.
[0027] It should be noted that the connection relationships of components not specifically mentioned in this application are all assumed to be based on existing technology. Since they do not involve the inventive point and are commonly used in existing technology, the structural connection relationships are not described in detail.
Claims
1. A machining fixture for a non-metallic I-shaped thin-walled hollow rotating body structure, characterized in that, It includes a clamping soft jaw (11) adapted to the machine tool and an internal support mechanism. The outer periphery of the clamping soft jaw (11) is covered with a soft material. The internal support mechanism includes an internal support fixture (12). The internal support fixture (12) includes a base (13) and an insert (14). The base (13) is adapted to the lathe jaw. The insert (14) is inserted into the inner cavity of the semi-finished raw material to be processed. The end of the insert (14) is provided with a pressure plate (15) and a clamping nut (16).
2. A method for processing a non-metallic I-shaped thin-walled hollow rotating body structure applied to the tooling described in claim 1, characterized in that, Includes the following steps: Step S1: Use a clamping soft jaw (11) to fix the outer circle of the blank workpiece, perform rough turning, drilling, and then boring; Step S2: Use a clamping soft jaw (11) to fix the outer circle of the other end of the blank workpiece, perform rough turning, drill a hole, and then bore the hole; Step S3: Change the cutting tool, perform initial machining of the window, turn the I-shaped window to form the inner cavity of the semi-finished raw material; Step S4: Using the internal support mechanism, the embedded part (14) is embedded into the inner cavity of the semi-finished raw material, and fixed by the pressure plate (15) and the clamping nut (16). The lathe clamps the outer circle of the base (13) and performs fine machining to remove the flange allowance at one end of the window, the wall thickness allowance of the center window, and the wall thickness allowance of the circular flange. Step S5: The other end of the workpiece is processed using the method in step S4 to obtain a rough-machined semi-finished raw material; Step S6: Perform fine processing on the semi-finished raw materials, and complete the processing of the wall thickness of the circular flanges at both ends and the window to the final dimensions.
3. The processing method for the non-metallic I-shaped thin-walled hollow rotating body structure according to claim 2, characterized in that, In steps S1 and S2, a φ90mm, 156mm long epoxy glass cloth rod is cut as the blank. Rough turning is performed using a carbide 95° tool. One end of the outer diameter is clamped with a soft jaw (11), the end face is flat, and the outer diameter is turned. The lathe spindle speed is 950~1070r / min, the feed rate is 0.12~0.15mm / r, and the depth of cut is 0.7~1mm. Drilling is performed using a U-shaped drill bit. A φ30mm spring steel U-shaped drill bit is used to drill to a depth of 8mm. 0mm, lathe spindle speed is 950~1070r / min, feed rate is 0.07~0.09mm / r, boring uses carbide 90° tool, lathe spindle speed is 950~1070r / min, feed rate is 0.1~0.12mm / r, depth of cut is 1.2~1.5mm, turn around, soft jaws hold the other end of the outer circle, flatten the end face, turn the total length 150mm, turn the outer circle, drill the inner hole, tool and machining parameters are selected as above.
4. The processing method for the non-metallic I-shaped thin-walled hollow rotating body structure according to claim 2, characterized in that, In step S3, the tool is changed to a cemented carbide 55° tool for initial machining of the window. The I-shaped window is machined from the center of the bar stock to the clamping end. Specifically, the I-shaped window is machined from the center of the bar stock to the clamping end. The lathe spindle speed is 500~600 r / min, the feed rate is 0.12~0.15 mm / r, the depth of cut is 0.4~0.5 mm, and the wall thickness of the center window is left to 2 mm.
5. The machining fixture and machining method for the non-metallic I-shaped thin-walled hollow rotating body structure according to claim 2, characterized in that, In steps S4 and S5, a carbide 90° tool is used for preliminary finishing turning to remove the flange allowance at one end of the window. The lathe spindle speed is 500~600 r / min, the feed rate is 0.1~0.12 mm / r, the depth of cut is 0.3~0.5 mm, the wall thickness of the center window is reduced to 2 mm, and the wall thickness of the circular flange is reduced to 3 mm. The other end is machined in the same way, and the wall thickness of the circular flange is reduced to 3 mm. Thus, the rough-machined semi-finished raw material is obtained.
6. The machining fixture and machining method for the non-metallic I-shaped thin-walled hollow rotating body structure according to claim 2, characterized in that, In step S6, a circular flange is radially turned using a 90° carbide tool, with the tool feed direction from the outside to the inside radially. The lathe spindle speed is 500~600 r / min, the feed rate is 0.03~0.05 mm / r, and the depth of cut is 0.04~0.05 mm. Finally, the inner wall of the window is finished using a 55° carbide tool with a 30° angled cut. The lathe spindle speed is 500~600 r / min, the feed rate is 0.03~0.05 mm / r, and the depth of cut is 0.2~0.25 mm. When the wall thickness margin is 0.5 mm, the depth of cut is changed to 0.08~0.1 mm. After completing the machining of the circular flanges at both ends and the window wall thickness to the final dimensions, the tooling and parts are removed. The dimensions and surface quality of the parts are checked to ensure they meet the requirements. The inner wall of the window is then finished using a 55° carbide tool with a 30° angled cut.