Model runner blade and lower ring joint hole processing process and tool clamp

Abstract

This invention relates to a machining process and fixture for the mating holes of model turbine runner blades and lower rings, belonging to the field of turbine model runner manufacturing technology. It solves the problems of clamping, alignment, and machining of the mating holes connecting the blades and lower rings of model turbine runners. The fixture consists of a base plate, support rod, washer, nut A, double-ended stud B, cover plate, pressure plate, and nut B. This machining method eliminates the error caused by separate machining of the runner's lower ring and blade mating holes, enabling the clamping and positioning of both components with a single fixture and allowing for machining of both components in one workstation. This reduces manufacturing costs, simplifies assembly, improves work efficiency, enhances the manufacturing quality of the model runner, and eliminates misalignment caused by alignment errors during separate component machining.

Description

Technical Field

[0001] This invention belongs to the field of water turbine model runner manufacturing technology, and in particular relates to a machining process and tooling fixture for the blades and lower ring of a model runner. Background Technology

[0002] The manufacturing precision of the turbine model runner determines the reliability of hydraulic test data and directly affects the success or failure of scientific research and development. Ensuring the precision machining and assembly of each component is crucial for turbine model testing. Furthermore, the numerous and precisely fitted mating holes in the lower ring and blades often present several key technical challenges during machining. 1) The thickness of the part where the blade intersects with the lower ring varies greatly. The minimum diameter of the mating hole is about 1.4 mm, and the wall thickness of some mating holes is only about 0.4 mm. The workpiece has poor local rigidity, which can easily cause the blade surface to bulge or even drill through during drilling, resulting in a high scrap rate. 2) When the lower ring countersunk hole and the blade countersunk screw hole are machined separately, their respective alignment datums need to be determined independently, and alignment errors are inevitable. The errors of the two clamping and two alignments accumulate with each other, resulting in the lower ring countersunk hole and the blade thread bottom hole not matching after machining. Misalignment occurs frequently during assembly, increasing assembly difficulty and reducing assembly accuracy. In severe cases, it may even require rework or scrapping. 3) Separate processing requires the separate design and manufacture of clamping fixtures and separate clamping and alignment, resulting in dispersed processes, long auxiliary time, low production efficiency, and high manufacturing costs.

[0003] In view of the above problems, a new processing technology is urgently needed to solve them. Summary of the Invention

[0004] In view of this, in order to solve the problems mentioned in the background art, such as hole misalignment and assembly difficulties caused by separate machining of the lower ring engagement hole and the blade thread bottom hole, as well as the problems of easy bulging and drilling leakage at the thin wall of the blade and lower ring intersection, the present invention provides a new, reasonable and perfect machining process and tooling fixture for the model runner blade and lower ring engagement hole, which reduces the machining difficulty of the model runner blade and lower ring engagement hole, and improves work efficiency and product quality.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a machining process and tooling fixture for the mating hole of a model rotor blade and a lower ring, comprising a base plate, a support rod, blades, a lower ring, a double-ended stud A, a double-ended stud B, a cover plate, a pressure plate A, an upper crown of the rotor, and a pressure plate B; A base plate is fixed on the machine tool worktable. The upper crown of the rotating wheel and the blade are fixed to form an integral structure and then installed on the base plate by a pressure plate B. The lower end of the support rod is fixed to the base plate, and the upper end face of the support rod forms an adjustable support end for pressing the lower end face of the upper crown of the rotating wheel. The pressure plate A is used to pre-press the combination of the upper crown of the rotating wheel and the blade onto the base plate, and the pressure plate B is used to assist in pressing the lower ring when machining the countersunk hole of the lower ring. The lower end of the double-ended stud A is connected to the base plate, and the upper end is used to pass through the center hole of the upper crown of the rotating wheel and then be fixed; the lower end of the double-ended stud B is connected to the base plate, and the upper end is used to pass through the cover plate and then be fixed, and the lower end surface of the cover plate constitutes a pressing surface for pressing the lower ring.

[0006] Preferably, the substrate has a cylindrical boss at its center, and the cylindrical boss has a threaded hole at its center for connecting with a double-ended stud A. The cylindrical boss is surrounded by multiple rings of threaded holes for mounting support rods.

[0007] Preferably, the support rod is a threaded support rod, the lower end of which is screwed into a threaded hole on the substrate, and the upper end face of which is pressed against the lower end face of the upper crown of the rotating wheel. The axial extension height can be adjusted by screwing the support rod.

[0008] Preferably, the upper end of the double-ended stud A passes through the central hole of the upper crown of the rotating wheel and is threadedly engaged with the nut A. The washer is sleeved on the double-ended stud A and located between the nut A and the upper crown of the rotating wheel. The washer has a plurality of threaded holes evenly distributed along its circumference for installing the double-ended stud B.

[0009] An assembly method for a tooling fixture that utilizes the above-mentioned model impeller blade and the lower ring clamping hole includes the following steps: S1. Substrate clamping: Fix the substrate on the machine tool workbench, place the assembly consisting of the crown and blade of the rotating wheel on the substrate, and pre-press the assembly onto the substrate using pressure plate A, bolts and nuts C. S2, Center Tightening: Pass the double-ended stud A through the center hole of the upper crown of the rotating wheel and connect it with the threaded hole in the center of the base plate. Install the washer and nut A in sequence above the upper crown of the rotating wheel, tighten nut A, and axially press and fix the combination of the upper crown of the rotating wheel and the blade onto the base plate. S3. Circumferential alignment: Adjust the position of the base plate on the machine tool table so that the rotation center of the assembly coincides with the rotation center of the machine tool table, and establish the workpiece coordinate system accordingly. S4. Horizontal alignment and auxiliary support: Adjust the multiple support rods evenly distributed on the base plate so that the upper end face of the support rod contacts and presses against the lower end face of the upper crown of the rotating wheel until the upper end face of the assembly is horizontal and each support rod is subjected to uniform force. S5. Blade thread bottom hole machining: Using the workpiece coordinate system established after alignment in steps S3 and S4 as the machining reference, compile a five-axis machining program for the thread bottom hole of the upper and lower ring handle of the blade according to the machining drawing, determine the machining sequence and select the machining tool, and machine the thread bottom hole on the blade according to the compiled program path. After machining, clean, deburr and inspect. S6. Lower ring assembly: Assemble the lower ring onto the blade with the threaded bottom hole already machined, and press and fix the lower ring onto the blade using the double-ended stud B, washer ring, cover plate, and pressure plate B; S7. Machining of the countersunk hole on the lower ring: Keep the machining datum and workpiece coordinate system established in step S5 unchanged, compile a five-axis machining program for the countersunk hole on the lower ring according to the machining drawings of the blade and the lower ring, determine the machining sequence and select the machining tool, and machine the countersunk hole on the lower ring according to the compiled program path. After machining, clean, deburr and inspect. S8. Complete the processing, remove the workpiece, clean and perfect it, and hand it over for inspection.

[0010] Preferably, in step S3, a dial indicator or micrometer is used to measure the outer circle or inner hole of the crown on the rotating wheel, and the radial position of the substrate is adjusted according to the measurement results so that the coaxiality of the rotation center of the assembly and the rotation center of the machine tool table meets the accuracy requirements of the machining drawings.

[0011] Preferably, in step S4, a dial indicator is used to scan and measure along the circumferential direction of the upper end face of the roller crown, and the axial extension height of each support rod is adjusted point by point according to the measurement results, so that the end face runout of the upper end face of the assembly meets the accuracy requirements of the machining drawings.

[0012] Preferably, in step S5, before machining the threaded bottom hole, a center hole is machined at each hole position or a centering drill is used for centering, and then the threaded bottom hole is drilled, so as to avoid drilling off-center, drilling leakage, or causing the blade surface to bulge at the thin wall part where the blade intersects with the lower ring.

[0013] Preferably, the machining of the blade thread bottom hole in step S5 and the machining of the lower ring countersunk hole in step S7 are completed in the same clamping state and the same workpiece coordinate system, and the workpiece is not re-clamped and re-aligned between the two processes.

[0014] Preferably, in step S6, the lower ring is directly installed on the blade with the pre-machined threaded bottom hole, so that the machining reference of the lower ring during the countersunk hole machining is consistent with the machining reference of the blade threaded bottom hole machining.

[0015] Compared with the prior art, the beneficial effects of the machining process and tooling fixture for the model impeller blade and lower ring engagement hole described in this invention are: This invention fundamentally revolutionizes the manufacturing technology of the model runner blades and lower ring clamping holes, representing a fundamental change in the manufacturing method. Compared to separate machining, the process method of this invention significantly reduces production difficulty, increases production efficiency, and improves the product quality of the model runner.

[0016] 1. This invention enables the clamping and positioning of two parts with a single tooling, thereby improving work efficiency and reducing manufacturing costs.

[0017] 2. This invention enables the processing of two parts in one workstation, eliminating the misalignment caused by the alignment error of the parts during separate processing, reducing assembly difficulty, improving work efficiency, and enhancing the manufacturing quality of the model wheel.

[0018] 3. The tooling fixture of this invention has a simple structure and ingenious design, which significantly improves production safety while ensuring processing quality.

[0019] 4. This invention can be processed according to different types of the lower ring of the model wheel and changes in the size and shape of the inner flow channel, thus expanding the processing range. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 A schematic diagram showing the clamping and machining of the model runner blades and the lower ring hole; In the figure: 1. Base plate; 2. Support rod; 3. Blade; 4. Lower ring; 5. Double-ended stud A; 6. Nut A; 7. Washer ring; 8. Double-ended stud B; 9. Nut B; 10. Cover plate; 11. Pressure plate A; 12. Machine tool worktable; 13. Upper crown of the rotating wheel; 14. Pressure plate B; 15. Nut C; 16. Bolt. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the drawings, and not all of them. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the invention.

[0022] See Figure 1This embodiment describes a tooling fixture for machining the mating holes of a model wheel blade and a lower ring, comprising a base plate 1, a support rod 2, a blade 3, a lower ring 4, a double-ended stud A5, a nut A6, a washer 7, a double-ended stud B8, a nut B9, a cover plate 10, a pressure plate A11, a wheel upper crown 13, a pressure plate B14, a nut C15, and a bolt 16; The lower end face of the substrate 1 is used to be fixedly connected to the machine tool worktable 12, and a cylindrical boss is provided at the center of its upper end face. The center of the cylindrical boss is provided with a central threaded hole for connecting with the double-ended stud A5. Several rings of support threaded holes are provided around the cylindrical boss. The number of support rods 2 is adapted to the number of support threaded holes. The lower end of the support rod 2 is threaded into the support threaded hole. The upper end face of the support rod 2 forms an adjustable support end for pressing against the lower end face of the upper crown 13 of the rotating wheel. The double-ended stud A5 and nut A6 are described above. The lower end of the double-ended stud A5 is used to connect with the central threaded hole, and its upper end is used to pass through the central hole of the crown 13 of the rotating wheel and then threadedly engage with the nut A6. The washer 7 is sleeved on the double-ended stud A5 and located between the nut A6 and the upper crown 13 of the rotating wheel. The washer 7 has a plurality of threaded holes evenly distributed along its circumference for installing the double-ended stud B8. The double-ended stud B8, cover plate 10 and nut B9 are described above. The lower end of the double-ended stud B8 is used to connect with the connecting threaded hole, and its upper end is used to pass through the cover plate 10 and then threadedly engage with the nut B9. The lower end face of the cover plate 10 forms a pressing surface for pressing the lower ring 4. The pressure plate A11 and pressure plate B14 are used to pre-press the combination of the upper crown 13 and the blade 3 of the rotating wheel onto the base plate 1, and the pressure plate B14 is used to assist in pressing the lower ring 4 when processing the countersunk hole of the lower ring 4. The washer 7 simultaneously serves as the bearing component for the nut A6 to press the crown 13 of the rotating wheel and the anchor seat for the lower end of the double-headed stud B8, so that the lower ring 4 can be pressed and fixed on the blade 3 under the condition that the combination of the crown 13 of the rotating wheel and the blade 3 remains in place and the machining reference and workpiece coordinate system remain unchanged.

[0023] A cylindrical boss is provided at the center of the substrate 1. The cylindrical boss has a threaded hole at its center for connecting with a double-ended stud A5. Multiple threaded holes for mounting the support rod 2 are evenly distributed around the cylindrical boss.

[0024] The support rod 2 is a threaded support rod, the lower end of which is screwed into a threaded hole on the base plate 1, and the upper end face of which is pressed against the support head on the lower end face of the crown 13 of the rotating wheel. The axial extension height can be adjusted by screwing the support rod 2. The support rod 2 is also provided with a locking nut for locking the support rod 2 to the base plate 1.

[0025] The upper surface of the support head is spherical, or a soft pad made of nylon or copper is provided on the upper surface of the support head.

[0026] The outer side of the center hole of the washer 7 is provided with a plurality of threaded holes evenly distributed along the circumference. The threaded holes are used to install the double-ended stud B8 to realize the installation and clamping fixation of the lower ring 4.

[0027] The lower end face of the washer 7 is provided with a positioning stop for positioning in conjunction with the center hole or upper end face of the crown 13 of the rotating wheel.

[0028] The supporting threaded holes are evenly distributed in several circles around the circumference, and the radius of the distribution circle of the supporting threaded holes in each circle is different, so as to adapt to the crown 13 of the rotating wheel with different diameter specifications.

[0029] The cover plate 10 is an annular disc-shaped component with a clearance hole in its center for avoiding the nut A6 and the washer 7. Its lower end face forms a pressing surface that fits against the upper end face of the lower ring 4.

[0030] A soft pad made of nylon or copper is provided between the cover plate 10 and the lower ring 4.

[0031] The lower end face of the substrate 1 is provided with a positioning key for cooperating with the T-shaped groove on the machine tool table 12, and the upper end face of the substrate 1 is also provided with a number of clamping thread holes for mounting the pressure plate A11.

[0032] An assembly method for a tooling fixture that utilizes the above-mentioned model impeller blade and the lower ring clamping hole includes the following steps: S1. Substrate clamping: Fix the substrate 1 on the machine tool worktable 12, place the assembly consisting of the upper crown 13 of the rotating wheel and the blade 3 on the substrate 1, and pre-press the assembly onto the substrate 1 by means of the pressure plate A11, bolt 16 and nut C15. S2, center tightening: pass the double-headed stud A5 through the center hole of the upper crown 13 of the rotating wheel and connect it with the threaded hole in the center of the base plate 1. Install the washer 7 and nut A6 in sequence above the upper crown 13 of the rotating wheel, tighten the nut A6, and axially press and fix the combination of the upper crown 13 of the rotating wheel and the blade 3 onto the base plate 1. S3. Circumferential alignment: Adjust the position of the base plate 1 on the machine tool table 12 so that the rotation center of the assembly coincides with the rotation center of the machine tool table 12, and establish the workpiece coordinate system accordingly. S4. Horizontal alignment and auxiliary support: Adjust the multiple support rods 2 evenly distributed on the base plate 1 so that the upper end face of the support rod 2 contacts and presses against the lower end face of the upper crown 13 of the rotating wheel until the upper end face of the assembly is horizontal and each support rod 2 is subjected to uniform force. S5. Blade thread bottom hole machining: Using the workpiece coordinate system established after alignment in steps S3 and S4 as the machining reference, compile a five-axis machining program for the common thread bottom holes of the upper and lower rings of blade 3 according to the machining drawings, determine the machining sequence and select the machining tools, and machine the thread bottom holes on blade 3 according to the compiled program path. After machining, clean, deburr and inspect. S6. Lower ring assembly: Assemble the lower ring 4 onto the blade 3 that has completed the threaded bottom hole machining. Use the double-ended stud B8, washer 7, cover plate 10, pressure plate B14 and nut B9 to press and fix the lower ring 4 onto the blade 3. S7. Machining of the countersunk hole on the lower ring: Keep the machining datum and workpiece coordinate system established in step S5 unchanged, compile a five-axis machining program for the countersunk hole on the lower ring 4 according to the machining drawings of blade 3 and lower ring 4, determine the machining sequence and select the machining tool, and machine the countersunk hole on the lower ring 4 according to the compiled program path. After machining, clean, deburr and inspect. S8. Complete the processing, remove the workpiece, clean and perfect it, and hand it over for inspection.

[0033] In step S3, a dial indicator or micrometer is used to measure the outer circle or inner hole of the crown 13 on the rotating wheel. Based on the measurement results, the radial position of the base plate 1 is adjusted so that the coaxiality of the rotation center of the assembly and the rotation center of the machine tool table 12 meets the accuracy requirements of the machining drawings.

[0034] In step S4, a dial indicator is used to scan and measure along the circumferential direction of the upper end face of the crown 13 of the rotating wheel, and the axial extension height of each support rod 2 is adjusted point by point according to the measurement results, so that the end face runout of the upper end face of the assembly meets the accuracy requirements of the machining drawings.

[0035] The machining of the threaded bottom hole of blade 3 in step S5 and the machining of the countersunk hole of lower ring 4 in step S7 are completed in the same clamping state and the same workpiece coordinate system. The workpiece is not re-clamped and re-aligned between the two processes.

[0036] In step S5, multiple threaded bottom holes are machined in a centrally symmetrical or intermittently skipped sequence to ensure that the cutting force and cutting heat are evenly distributed around the workpiece.

[0037] In step S6, the lower ring 4 is directly installed on the blade 3 with the threaded bottom hole already machined, so that the machining reference of the lower ring 4 during the countersunk hole machining is consistent with the machining reference of the blade 3 during the threaded bottom hole machining.

[0038] In step S7, the countersunk hole on the lower ring 4 is formed in one step using a countersink or forming tool, and the hole opening is chamfered simultaneously.

[0039] Steps S5 and S7 are both performed on a five-axis machining center. The machining of the engagement holes on each blade 3 is completed sequentially by the rotation indexing of the machine tool worktable 12.

[0040] The embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A fixture for machining the mating hole of a model impeller blade and a lower ring, characterized in that: Includes a base plate (1), a support rod (2), a blade (3), a lower ring (4), a double-ended stud A (5), a double-ended stud B (8), a cover plate (10), a pressure plate A (11), a rotating wheel crown (13), and a pressure plate B (14). The upper crown (13) of the rotating wheel and the blade (3) are fixed to form an integral structure, and then installed on the base plate (1) by the pressure plate B (14). The lower end of the support rod (2) is fixed to the base plate (1), and the upper end face of the support rod (2) forms an adjustable support end for pressing the lower end face of the upper crown (13) of the rotating wheel. The pressure plate A (11) is used to pre-press the combination of the upper crown (13) of the rotating wheel and the blade (3) onto the base plate (1). The pressure plate B (14) is used to assist in pressing the lower ring (4) when processing the countersunk hole of the lower ring (4). The lower end of the double-ended stud A (5) is connected to the base plate (1), and the upper end is used to pass through the center hole of the upper crown (13) of the rotating wheel and then be fastened; the lower end of the double-ended stud B (8) is connected to the base plate (1), and the upper end is used to pass through the cover plate (10) and then be fastened; the lower end face of the cover plate (10) forms a pressing surface for pressing the lower ring (4).

2. The fixture for machining the model runner blades and the lower ring mating hole according to claim 1, characterized in that: The substrate (1) has a cylindrical boss at its center, and the cylindrical boss has a threaded hole at its center for connecting with the double-ended stud A (5). The cylindrical boss is surrounded by multiple rings of threaded holes for installing the support rod (2).

3. The fixture for machining the model runner blades and the lower ring mating hole according to claim 1 or 2, characterized in that: The support rod (2) is a threaded support rod. Its lower end is screwed into the threaded hole on the base plate (1), and its upper end face is pressed against the lower end face of the crown (13) of the rotating wheel. The axial extension height can be adjusted by screwing the support rod (2).

4. The fixture for machining the model runner blades and the lower ring mating hole according to claim 1, characterized in that: The upper end of the double-ended stud A (5) passes through the center hole of the upper crown (13) of the rotating wheel and is threaded into the nut A (6). The washer (7) is sleeved on the double-ended stud A (5) and is located between the nut A (6) and the upper crown (13) of the rotating wheel. The washer (7) has multiple threaded holes evenly distributed along the circumference for installing the double-ended stud B (8).

5. An assembly method using a tooling fixture for machining the model impeller blade and the lower ring clamping hole as described in any one of claims 1-4, characterized in that: Includes the following steps: S1. Substrate clamping: Fix the substrate (1) on the machine tool worktable (12), place the assembly consisting of the crown (13) of the rotating wheel and the blade (3) on the substrate (1), and pre-press the assembly onto the substrate (1) using the pressure plate A (11), bolt (16) and nut C (15). S2, center tightening: pass the double-headed stud A (5) through the center hole of the upper crown (13) of the rotating wheel and connect it with the threaded hole in the center of the base plate (1). Install the washer (7) and nut A (6) in sequence above the upper crown (13) of the rotating wheel, tighten the nut A (6), and axially press and fix the combination of the upper crown (13) of the rotating wheel and the blade (3) on the base plate (1). S3, Circumferential alignment: Adjust the position of the base plate (1) on the machine tool table (12) so that the rotation center of the assembly coincides with the rotation center of the machine tool table (12), and establish the workpiece coordinate system accordingly; S4. Horizontal alignment and auxiliary support: Adjust the multiple support rods (2) evenly distributed on the base plate (1) so that the upper end face of the support rod (2) contacts and presses against the lower end face of the upper crown (13) of the rotating wheel until the upper end face of the assembly is horizontal and each support rod (2) is subjected to uniform force. S5. Blade thread bottom hole machining: Using the workpiece coordinate system established after step S3 and S4 as the machining reference, compile a five-axis machining program for the thread bottom holes of the upper and lower rings (4) of the blade (3) according to the machining drawings, determine the machining sequence and select the machining tool, and machine the thread bottom holes on the blade (3) according to the compiled program path. After machining, clean, deburr and inspect. S6. Lower ring assembly: Assemble the lower ring (4) onto the blade (3) that has completed the threaded bottom hole machining, and press and fix the lower ring (4) onto the blade (3) by using the double-headed stud B (8), washer (7), cover plate (10), and pressure plate B (14); S7. Machining of the countersunk hole on the lower ring: Keep the machining datum and workpiece coordinate system established in step S5 unchanged, compile the five-axis machining program for the countersunk hole on the lower ring (4) according to the machining drawings of the blade (3) and the lower ring (4), determine the machining sequence and select the machining tool, and machine the countersunk hole on the lower ring (4) according to the compiled program path. After machining, clean, deburr and inspect. S8. Complete the processing, remove the workpiece, clean and perfect it, and hand it over for inspection.

6. The assembly method for machining tooling fixtures using model wheel blades and lower ring engagement holes according to claim 5, characterized in that: In step S3, a dial indicator or micrometer is used to measure the outer circle or inner hole of the crown (13) on the rotating wheel. The radial position of the base plate (1) is adjusted according to the measurement results so that the coaxiality of the rotation center of the assembly and the rotation center of the machine tool table (12) meets the accuracy requirements of the machining drawings.

7. The assembly method for machining tooling fixtures using model wheel blades and lower ring engagement holes according to claim 5, characterized in that: In step S4, a dial indicator is used to scan and measure along the circumferential direction of the upper end face of the crown (13) of the rotating wheel, and the axial extension height of each support rod (2) is adjusted point by point according to the measurement results so that the end face runout of the upper end face of the assembly meets the accuracy requirements of the machining drawing.

8. The assembly method for machining tooling fixtures using model wheel blades and lower ring engagement holes according to claim 5, characterized in that: In step S5, before machining the threaded bottom hole, the center hole is machined in each hole position or the centering drill is used for centering, and then the threaded bottom hole is drilled to avoid drilling off-center, drilling leakage or causing the blade surface to bulge at the thin wall part where the blade (3) intersects with the lower ring (4).

9. The assembly method of the tooling fixture for machining the model wheel blade and the lower ring clamping hole according to claim 5, characterized in that: The machining of the threaded bottom hole of the blade (3) in step S5 and the machining of the countersunk hole of the lower ring (4) in step S7 are completed in the same clamping state and the same workpiece coordinate system. The workpiece is not re-clamped and re-aligned between the two processes.

10. The assembly method of the tooling fixture for machining the model wheel blade and the lower ring clamping hole according to claim 5, characterized in that: In step S6, the lower ring (4) is directly installed on the blade (3) with the threaded bottom hole already machined, so that the lower ring (4) keeps the machining reference of the counterbore machining consistent with the machining reference of the threaded bottom hole machining of the blade (3).

Images